JPS58102470A - Electrode with frame of stacked cell - Google Patents

Abstract

PURPOSE:To improve molding condition and facilitate production by inserting a carbon plastic material in a punched portion of a middle frame and placing the middle frame between an upper frame and a lower frame and heat-pressing to form an electrode with frame. CONSTITUTION:When an electrode with frame of an electrolyte circular type secondary cell is formed, an upper frame 15 and a lower frame 16 having center punched portions 15a and 16a respectively are prepared with resins of polyolefin family. A middle frame 17 having a punched portion 17a and a carbin plastic material 18 which acts as an electrode are prepared with the same material. The carbon plastic material is inserted in the punched portion 17a of the middle frame 17,and the middle frame 17 is placed between the upper frame 15 and the lower frame 16 and they are set in the molds 22 and 23, and heat-pressed to bond together. Therefore, air is not kept inside the frame, good molded product fitted to the mold is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a framed electrode used for electrolyte circulation and secondary batteries.

The main object of the present invention is to provide a framed electrode for a laminated battery that has good strength and is easy to manufacture.

FIG. 1 is a basic configuration diagram of an electrolyte circulation W4 type secondary battery in which a framed electrode according to the present invention is used.

This secondary battery supplies catholyte from a catholyte storage tank 4 to a cathode chamber 3 formed between a cathode 1 and a diaphragm (separator) 2 by a liquid circulation pump 51, and also supplies one anode Ii
The anolyte chamber 7 formed between the diaphragm 6 and the diaphragm 2 is supplied with anolyte from the anolyte storage tank 8 by a liquid circulation pump 5bk. Kameo, 9m, and 9b are pulp and open during charging and discharging.

FIG. 2 is a structural perspective view showing a specific example of the structure of such an electrolytic solution IITMM secondary battery O. Each electrode and diaphragm are supported by an O-frame having the same external shape, and are stacked one on the other with one electrode and diaphragm 2 sandwiched therebetween. In this case, the distance between the electrode and the diaphragm is less than 1 mm, and the electrode and electrode frame are made thin in order to reduce the stacking length.

Conventionally, frame electrodes used in this stacked manner have been formed as shown in Figure 111I3. That is,
Fig. 3 is a cross-sectional view of a frame electrode inserted into the inside of the metal wire.As for the shape, one sheet of resin 11 for molding the frame portion and one sheet of carbon 11E for molding the pole portion. The plastic 12 is overlapped with an overlapping portion 13 of 2 to 3 mm. Frame molding wood ml
11. The carbon plastic 12 for molding the electrode part is a plate-shaped material, and the former is made of gold I[O
The microphone is designed to cover the channel part, and the perpendicular positioning is in the frame and fi! Equally extraordinary. In addition, the outer shape of the frame material 11 is determined by cutting out the inside of the mold 2 to 3 mm smaller, and considering the internal volume of the mold, the volume of the mold, and the body expansion due to heating of the resin, the excess amount is ± It was adjusted so that it was 5s/5 parts. The ζO results showed that the thickness of the carbon plastic constituting the electrode plate was in the range of 1.0 to 1.4 t, and the thickness of the frame material supporting the electrode plate was in the range of 3.0 to 5.0 t.

Conventional electrodes with O-frames, which are molded in a circular manner, have had various problems as listed below.

(1) In Fig. 3, the carbon plastic and frame materials of A and D@JFi are in direct contact with the inner surface of the metal lid, whereas surfaces B and C are in a floating state, so during heat pressing, The heat conductivity is poor, and stirring time is required to ensure that there are no parts that do not melt.

(1) Part 8 becomes a closed space.1 Also, when -it is pressurized in a molten state, this closed space EIIK remains and when a large amount of air escapes, it significantly worsens the stratification state of Dlij, In addition, the yield rate is very high, as there are cases where the air cannot be completely removed by itself.

(lit) Since the carbon plastic is molded by being pushed into the rhinoceros frame material, cracks tend to occur at the F section.

OV) In the molded product, a part of the carbon plastic is exposed to the surface of the frame on the side A, while on the opposite side D, the frame material flows into the carbon plastic surface and the effective electric current is The area of Ili is significantly reduced.

(■) Because the frame material is thick, it takes time and effort to cut the material into a predetermined shape in advance.

In particular, the present invention eliminates these gaps and provides a frame electrode that is easy to manufacture. The framed electrode according to the present invention includes an upper frame material and a lower frame material.
1%l! It is characterized in that it is constructed by sandwiching an intermediate frame material that is punched out to a predetermined size in the middle, inserting the carbon plastic material that will constitute the electrode plate into the cutout of the intermediate frame material, and heat pressing it.

Fig. 4 is a material configuration diagram (overlapping method) of the framed electrode Ii according to the present invention, and Fig. 5 is a sectional view of the material of the framed electrode of the present invention inserted into the mold. In the figure, 15 is the upper frame material and 16 is the lower frame material, both of which have the same shape and the same thickness C! The paper is made up of an O-sheet, and the center thereof is a punched part 15a cut out in the same shape as the mold frame part.

It has 16 fields. This upper frame material 15. Lower frame material 16
Thermoplastic, for example, polyolefin resin is used as the material. 17 is the upper frame member 15° and the lower frame member 16
The intermediate frame material is made of the same material, and its thickness is the thickness C2 of the frame material 15.16! The center portion has a punched portion 17m cut out to have a slightly smaller shape than the cutout portions 15m and 16m provided in the frame members 15 and 16. 18 is the carmen plastic material that constitutes the electrode, and its thickness is 31 of frame materials 15 and 16.17! The outer shape is the same, and the outer diameter is slightly larger than the effective electrode part, and the same size as the punched part 17a of the intermediate frame material.The carbon plastic material 18 may be made of, for example, fine carbon powder. The carbon plastic material 18 is formed by mixing polyolefin resin as a thermoplastic material and molding it by heat press.
The punched part 17aK is inserted, and the intermediate frame material 17 is placed inside the sandwiching mold between the upper frame material 15 and the lower frame material 16, and is integrally molded by pressurizing the mold and heat pressing. Ru.

When the metal lid is completely closed, the effective electrode part (carbon plastic part) becomes, for example, 1.0 mm, which is 0.2 to 0.4 mm thinner than the initial thickness C8. Therefore, before forming the framed electrode, when the upper mold is gently placed on the mold, there is a gap Ct between the upper mold and the lower mold of about 1 mm, including warpage and cracking of each material.

FIG. 6 is a plan view of the main parts showing a specific example of the structure of the frame electric to according to the present invention molded in this way. Here, the carbon plastic material 18 constituting the electrode is layered around the intermediate frame 17, and this intermediate frame is sandwiched between the upper and lower frame members 15 and the lower frame member 16 and melted. It is integrally molded. This microchannel is provided so that the electrode solution manufactured by No. 19 can be uniformly introduced around the electrode plate, and is also formed in the intermediate frame 17 by molding with a mold.

The frame electrode constructed in this way has three separate frame materials, so when stacking them in a mold and heat pressing them, there is no chance of trapping air between each sample. , it is possible to easily obtain a good molded product that accurately corresponds to the mold. Since the flow of the resin can be reduced during heat pressing, defects such as tearing and cracking of the carbon plastic are almost eliminated, and the effective area of the electrode is also exactly as designed.

[Brief explanation of drawings]

Figure 1 shows electrolyte circulation using the framed electrode according to the present invention.
A basic configuration diagram of a ll-type secondary battery, FIG. 2 is a perspective view showing a specific configuration example, and FIG. 3 is an explanatory diagram illustrating a conventional method of forming a framed electrode for a laminated battery. , Fig. 4 is a material configuration diagram of the framed ILT electrode according to the present invention, Fig. 5 is a sectional view of the material of the framed electrode of the present invention inserted into the mold and in a friendly state, and Fig. 6 is a concrete diagram thereof. FIG. 3 is a plan view of main parts showing a configuration example. 15... Upper frame material, 16... Lower frame material,
17...Intermediate frame material, 17F...Punching part,
18... Carmen Plastic Material Agent Patent Attorney Tadashi Sato Year III Figure 2 Figure 3 wJ Figure 4 Figure 5 1 ノ2n 口==Shi 21 Co. Procedural Amendment (Voluntary) 1,1' Authorization Mr. Commissioner, April 3, 1982
0111, Indication of the issue *1 A1856-200854 No. 2, Name of the invention Framed electrode of laminated battery 3, Relationship with the person making the amendment r'l Patent Applicant name (name) (610) Akira Co., Ltd. Electric ★4,
Agent 6/Supplementary IF T Target: The "Detailed Description of the Invention" column of the specification and drawings (1) The "Detailed Description of the Invention" column of the specification will be amended as follows. (2) Figures 1 to 5 of the drawings shall be amended as attached. Corrected drawing figure 1

Claims (1)

[Claims] (1) An upper frame material, a lower frame material, a frame material having a punched part in the shape of O1# with a diameter of yjl in the middle, and a carbon plastic material forming an electrode, A laminated battery frame formed by inserting the carbon plastic material into the punched part of the intermediate frame material and heat-pressing the 1-0 medium frame material between the upper frame material and the lower frame material. With electrode.