JPS58103779A - Electrode end plate of stacked cell - Google Patents

Abstract

PURPOSE:To provide an electrode end plate having no contact resistance between an outside electrode terminal and an electrode by embedding a metal mesh in the almost all surfaces of a carbon plastic which is an electrode and exposing part of the metal mesh and stacking a frame on both sides of the carbon plastic and molding together them. CONSTITUTION:A microchannel 16 is formed in part of a microchannel molded frame 31b with a mold and it is passing to a manifole 14 through a chennel 15. The manifold 14 and channel 15 are formed with the mold when the frame is molded. An electrode end plate which is constructed by stacking each element and molding together them forms one element, and a metal mesh plate 40 which acts as an outside electrode terminal is embedded in the whole surface of carbon plastics 30a and 30b to form a frame. Therefore, contact resistance is eliminated and since mechanical strength is increased, warp after molding is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode end plate used in an aN battery such as a metal-halogen battery.

In a stacked battery, electrode end plates with external electrode terminals are required at both ends of the laminated framed electrodes, but with the present invention, the electrode end plates and the frame that holds the electrode end plates are integrally molded. The present invention relates to an electrode end plate of a laminated battery constructed as follows.

Figure 1 is a basic configuration diagram of a metal-halogen battery, which is one of the batteries in which the electrode end plate according to the present invention is used. This battery is composed of a battery reaction tank 51 in which the electrode 1 is installed with the separator 2 in between, a positive wL liquid storage tank 52 and a catholyte storage tank 53. Each electrolyte is circulated from the storage tank side into each room partitioned by.

FIG. 2 is an exploded perspective view showing an example of a stacked structure of such batteries. Each electrode 1, separator 2, and electrode end plate 6 have frames 1L and 2L of the same shape.
31, and are sandwiched and stacked from both sides by side plates 6, with a large number of bolt holes 12 provided in each frame.
The bolt 7 is inserted through the hole 22 and tightened to form the whole body in one piece. The electrode terminal 6 has an external electrode terminal 4 for extracting power to the outside. One end plate 6
has an electrolyte outlet 61 on the end plate, and an electrolyte outlet 62 on the other end plate.
The electrolytic solution entering from the electrolytic solution population 61 is rectified from the manifold 14 provided in the electrode frame 11 through the channels 15 and the microchannels 16, and is supplied to the surface of the electrode plate 10. It has become.

Here, the distance between the electrode 1 and the separator 2 may be several inches or less, and it is desirable that the electrode be thin in order to reduce the length and thickness of the stacked layers.

By the way, conventionally, in the electrode end plates used in such laminated batteries, a method has been adopted in which a metal conductor, which becomes the electrode terminal, is pressed into contact with the carbon plastic plate, which is the electrode material, during electrode assembly. Therefore, there were problems such as high contact resistance and easy corrosion of the gold M conductor. In addition, many elements are required for stacking and assembly, and holes for manifolds must be made in the metal conductor, which makes sealing and insulation processing difficult.

Here, the present invention has been made for the purpose of eliminating such problems and drawbacks. In the electrode end plate according to the present invention, a metal mesh is embedded in the carbon plastic that is the electrode part material over the entire surface of the carbon plastic material, and a part is exposed, and frame materials are stacked on both sides of the carbon plastic material, It is unique in that it is constructed by integral molding.

Figure 3 is an exploded perspective view showing an example of an electrode end plate according to the present invention. In the figure, 40 is a metal mesh, 30a, 3
0b is carbon plastic forming the electrode part, 31a
+31b has carbon plastic 30a in the middle,
30 b is a microchannel molded frame cut out in the same shape as the outer shape, 62 is an outer frame cut out in the middle into a shape slightly larger than the outer shape of carbon plastic, and 63 is a back plate made of the same material as the thick frame 32. be. This back plate 66
° Outer frame 32 and microchannel molding frame 31 a.

31b is constructed so that its outer shape is exactly the same as shown in the figure. Metal mesh 40U, 2 carbon glass snacks 30a.

30b from both sides and embedded over the entire surface of the carbon plastic.

Fig. 4 is an explanatory view showing the internal state of the materials shown in Figs.

The carbon plastics 30a, 30b with the metal mesh plates 40 embedded therein are inserted into the cutouts in the middle of the microchannel molding frames 31a, 31b, and the microchannel molding frames 31a, 31b are inserted into the frame 32.
It is sandwiched from both sides by the back plate 63 and is integrally molded.

FIG. 5 is a perspective view of the structure of the electrode end plate integrally molded in this manner. One surface (carbon plastic 30b side) of this electrode end plate acts as an electrode part, while the other surface (carbon plastic 30a side) is completely covered by the back plate 36 and acts as an electrode. do not. Carbon plastic 30b that acts as an electrode part
On the side, a microchannel 16 is formed by the mold by a part of the microchannel molding frame 31b, which communicates with the manifold 14 through the channel 15. These channels 15 and manifold 14 are also formed by a mold during molding. In this way, the electrode end plate constructed by overlapping and integrally molding each material has the electrode end plate as a single element, and the metal mesh plate 40 serving as the external electrode terminal is made of carbon plastic 3Qa, carbon plastic 3Qa, Since the grid is integrally embedded in the entire surface of the grid 30b, contact resistance can be eliminated. Since the overall strength of the neck is greatly increased, it is possible to improve warping after molding.

FIG. 6 is an exploded perspective view showing another embodiment of the electrode end plate according to the present invention. In this embodiment, the back plate is omitted from the electrode end plate shown in FIG. 6, and a metal mesh plate 40 is sandwiched from both sides by carbon plastics 30a and 30b, and this is sandwiched between outer frames 31a and 51b. , one side (carbon plastic 30b
The lowermost outer frame is superimposed on the outer frame (side) and is integrally molded. With this configuration, there is no extreme difference in the resin material on both sides of the electrode end plate compared to the electrode end plate shown in FIG.
It can be made symmetrical in the thickness direction, and warping after molding can be eliminated.

The off view is an explanatory diagram showing a state in which the materials of the electrode end plates shown in FIG. 6 are stacked one on top of the other and inserted between the molds 6a and 6b. Here, in the metal mesh 40, the parts exposed from the carbon plastics 30a and 30b are shown.
A material layer that does not melt at the molding temperature and does not bond or fuse with the molding material, for example, the fluororesin layer 41
is formed in advance before molding. In addition,
This material layer may be formed by wrapping a film-like material, for example, a sealing tape such as Teflon (registered trademark).

By performing such treatment, the surplus of the electrode frame molding resin, which is relatively fluid in a molten state, is removed from the material inserted into the mold by thermally compressing the mold during molding. Even if the resin flows out from the exposed metal mesh 40 through the path ■→■→0 and covers the metal mesh, this resin can be easily peeled off, and the part of the metal mesh corresponding to the external electrode terminal will be damaged. Not at all. Note that such a method can be similarly applied to the case of FIG. 4.

FIG. 8 is an exploded view showing an example of a mold for molding an electrode end plate according to the present invention. In this figure, 6b
The lower mold is the same mold used for molding the framed electrode of the intermediate electrode 1 (see FIG. 2) of the stacked battery.

61b, 62b, 63b, 64b are lower molds (6b
), and its thickness of 1° is selected to match the thickness of the electrode end plate. Of this lower formwork, 63b, 64
b is provided with relief grooves 630 and 640 of metal mesh.

FIG. 9 is an enlarged perspective view of this clearance groove, which is provided in order to expose a part of the metal mesh that is embedded and torn off for external electrode terminals together with the resin during molding. It is being

Here, the depth t2 of the relief grooves 630, 640 is appropriately selected depending on the thickness of the metal mesh. By providing such clearance grooves 630, 640 in the lower formworks 63b, 64b, metal mesh can be formed. An electrode end plate of a desired shape can be molded without A fiA. 6
A is an upper mold, and its molding surface is flat. Here, the thickness t3 of the convex portion of the upper die is selected to match the thickness of the electrode end plate.

In FIG. 8, the molding portions of a microchannel 16b, a channel 15b, and a manifold 14b are formed on the molding surface at the center of the lower mold 6b. here,
XX sectional view and Y of the microchannel molded part 16b
-X sectional views are shown in FIGS. 10(a) and 10(b), respectively. Of each stepped part of each microchannel molded part 16b, one side facing the frame material side (the part indicated by the arrow) and the stepped part at the boundary between the electrode part and the frame material (indicated by the arrow in FIG. 10(B)) part) is formed to be rounded. By applying %R7111 treatment to each of these parts as shown in the figure, stress concentration is reduced during molding of the resin or material, and cracking due to shrinkage is prevented immediately before mold release. That is, as shown in FIG. 11, during molding, the material from the frame material 61 side contracts toward the center as shown by the arrow without stress concentration at the R710 part, thereby preventing cracking.

As explained above, according to the present invention, since the electrode part, the external electrode terminal connected to it, and the frame holding these are integrally molded, the whole becomes one element.
An electrode end plate with no contact resistance between the external electrode terminal and the electrode part can be realized.

[Brief explanation of the drawing]

Fig. 1 is a basic configuration diagram of a metal-halogen battery, which is one of the batteries in which the electrode end plate according to the present invention is used, and Fig. 2 is an exploded perspective view showing an example of a stacked structure of such batteries. Fig. 3 is an exploded perspective view showing an example of the electrode end plate according to the present invention, Fig. 4 is an explanatory view showing the state in which each material of the electrode end plate is inserted into the mold, and Fig. 5 is an integrated view. FIG. 6 is an exploded perspective view showing another embodiment of the electrode end plate according to the present invention. Explanatory diagram showing the inserted state, fang 8
The figure is an exploded view showing an example of a mold for molding the electrode end plate according to the present invention; FIG. 9 is an enlarged perspective view of a part of the mold; FIG. 10 (A). (B) is the X-X, Y-Y sectional view in Figure O8, No. 11
The figure is an explanatory diagram for explaining the action of the mold having the cross section shown in FIG. 10. 40...Metal mesh, 30a, 30b...
Carbon plastic 3ia, 31b...frame,
32...Outer frame, 33...Back plate, 41
...Material layer p 6 a t 6 b... Mold agent Patent attorney Masaru Sato Year 1θ Figure (a) Procedural amendment (voluntary) To the Director General of the Agency April 30, 1982
[11. Indication of the case Japanese Patent Application No. 56-201467 2. Name of invention Name of electrode end plate of laminated battery Name (610) Meidensha Co., Ltd. (name) 4. Agent Ippa ゛ ' - 6. Supplement 11 :, Subject of "Detailed description of the invention" in the specification
Column 7, Contents of amendment

Claims (2)

[Claims] (1) A metal mesh is embedded inside the carbon plastic material that is the material for the electrode part, covering the entire surface of the carbon plastic material, and a part of the mesh is exposed to form an external electrode terminal. The electrode end plate of a laminated battery is constructed by stacking frame materials on both sides and integrally molding them. (2) A material layer that does not melt at the molding temperature and does not bond or fuse with the molding material is formed in advance on the metal mesh portion exposed from the carbon plastic material before molding. Electrode end plate of the laminated battery described in .