JPS58102471A - Manufacture of stacked cell electrode - Google Patents

Abstract

PURPOSE:To decrease warp of an electrode by bonding together an electrode and a frame with a heat press using a mold, cooling near room temperature as it is placed between asbestos plates after releasing from the mold and annealing in the manner that push plates are arranged with interposed core plates. CONSTITUTION:When an electrode with frame of an electrolyte circular type secondary cell is formed, an electrode 11 and a frame 15 are molded together with a heat press using a mold. The molded product is released from the mold, and placed between two sets of asbestos plates and after a weight is put on them, allowed to stand in the air to cool near room temperature. Aluminum push plates 21 and 22, core plates 31 and 32 are prepared. The core plates 31 and 32 are placed on the both sides of an electrode 11, they are pushed with the push plates 21 and 22, and allowed to cool slowly. By two stage annealing, warp in the center of the electrode is prevented and excellent molded product is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an electrode for use in a circulating electrolyte secondary battery. .

The main object of the present invention is to provide a method for manufacturing a laminated battery electrode that does not have a central omiim K111 or the like and can be manufactured in a single hour using simple processing steps.

FIG. 1 is a basic configuration diagram of an electrolyte circulation type secondary battery using an electrode manufactured according to the present invention. In this secondary battery, a catholyte is supplied 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 5aK, and a catholyte is supplied between an anode 6 and a diaphragm 2. The anolyte is supplied from the anolyte storage tank 8 to the anode chamber 7 formed between the anolyte and the anolyte chamber 7 by a liquid** pump 5b. Note that 9m and 9b are valves that are opened during charging and discharging.

FIG. 2 is a structural perspective view showing a specific example of the structure of such an electrolyte circulation type secondary battery. Each electrode 1 and 2 are supported by a frame with the same external shape, and each electrode is 11
It has a structure in which 4M2 is sandwiched and stacked. here,
As the material of the electrode frame 15, for example, plastic (for example, thermoplastic polyolefin resin) is used.
In consideration of corrosion resistance, stiffness, moldability, etc., a plastic mixed material of the same quality as the frame material is used for the electrode portion 11, containing less than 50 wt carbon. In addition, the distance between the electrode and the diaphragm is less than 1 mm, and the electrode and electrode frame are thin in order to reduce lamination. The electrode part and the electrode frame that supports it are integrally molded using a mold using a heat press or the like. In this integral molding process IM, a relatively high temperature is selected in consideration of problems such as molding efficiency and moldability, since if the mold release temperature is too low, tarnk will easily occur.

For this reason, the molded product shrinks in a free state after the m mold. Figure 13 shows the cross section 1i when the molded product after 1IIIWI is left in the air and cooled to room temperature. in this case,
The shrinkage rates are different between the electrode portion 11 and the frame portion 15, and as shown in the figure, a bulge occurs over the entire electrode. Therefore, in the past, as shown in FIG. 4, the molded product that had cooled to room temperature was heated again to the temperature of the mold, and then placed between flat plates and subjected to 72 rings. However, with this method, excessive stress is applied to the molded product, causing cracking, and the thickness S of the electrode portion 11 is smaller than the thickness of the shoulder frame 15.
Due to the thinness of the electrode, there may still be some warpage in the center of the electrode.

Here, the present invention is based on the conventional method.
This was done to solve 11 problems.

FIG. 5 is an explanatory diagram for explaining the main part of the manufacturing method according to the present invention. In the present invention, the molded product after molding is subjected to the following two-stage annealing (post-treatment). That is, (1) Immediately after demolding, perform KIQ
Prepare two sets of asbestos plates that are IO thick and have an area nearly twice the size of the molded product.The molded product is sandwiched between the two sets of asbestos plates, a weight is placed on it, and the molded product is left in the air to cool to near room temperature. Stir. Through this process, molded products are released into the air.
The degree of warping is greatly increased compared to when it is left in state 1.

(Zeng) Next, nine air ring plates (push plates) 21.22-... and core plates 31.32-... are made of aluminum etc.
・When preparing -, heat these separately from the molded product to the temperature of 1 core, as shown at 5 mK.
, 32...- are interposed between both IIs (both upper and lower surface sides) of the electrode portion 11, and the push plates 21, 22...
・Put the KIIL-shaped products in the container, stack them on top of each other, and slowly cool them.

Note that it is not necessary to particularly heat the push plates 21, 22, . . . , or only the core plates 31, 32, . . . may be heated. Here, core plate 31.32
As shown in FIG.
When sandwiched between two core plates (side), the total thickness of these two O core plates and the electrode part 11CI is the electrode frame 150 thickness! are selected to be equal. Further, the edges of this core plate are rounded. This prevents the resin from being eaten away when the core plates are interposed on both sides of the electrode section 110 and the press plates are used to tighten them from both sides.

FIG. 7 is a cross-sectional view showing a state in which core plates 31.3 are interposed on both sides of the electrode portion 110, and these are stacked and tightened by pressing $21.22. Push plate 21゜22...
...Tightening by k can be done automatically by placing a weight on the push plate 21 or by tightening by Pol F.

In addition, in this ζ, one 0IIE pole part 11 and electrode frame 1
5 is shown, but as shown in Fig. 5, some 0IIL type products are inserted with core plates on both sides of the electrode part, and the frame @15 and the center are tightened. You may stack the push plates one after another on top of the child plate. Therefore, it is possible to make many O-molded products 0IIJ and rings at the same time.

The laminated battery electrode O formed through such post-processing steps
According to the manufacturing method, there are the following @blue effects.

(1) Since the annealing process was performed in two stages, 0IJ11fIA was facilitated at each stage. That is, in the first stage, the molded product itself is at a very high temperature, so it is in a soft state, and the work of inserting it into asbestos is extremely easy. In addition, in the second stage, since the warpage is caused by the pretreatment in the first stage 11,
There is no need for heating at higher temperatures than necessary or for stirring time, and stacking work can be done easily.

(Amount) In the second stage processing, 0 molded products are produced at one time.
46 processes can be performed, greatly reducing the overall processing time.

Side) The manufactured laminated battery electrode has no warpage in the central electrode portion, and no cracks, etc.4.

[Brief explanation of drawings]

Figure 1 is a basic configuration diagram of an electrolyte circulating AM secondary battery using an electrode manufactured according to the present invention, Figure 2 is a perspective view of its configuration showing a specific example of its configuration, and Figure #13 is a demolding diagram. Cross-sectional view of the molded product left in the air to cool, 114
11 is a rounded explanatory diagram illustrating the conventional annealing of a molded product after release from the mold, FIG. 5 is an explanatory diagram illustrating the main part of the manufacturing method according to the present invention, and FIG. FIG. 7, which is an explanatory diagram of the structure of the child plate, is an explanatory diagram showing the post-processing state in the present invention. 1... Electrode, 11... Electrode part, 15... Electrode frame 21. 22... Push plate, 31. 32... Nakako Itashiro Santo Patent Attorney Sato Wang Miyako Figure 3 4 factor 2 Figure 5 50 Figure 6 Figure 7 + 1 32 Procedural amendment (voluntary) Commissioner of the Patent Office April 1981 30n1
, Indication of case Ifllill J @ 56-200855 No. 2, Title of invention Method for manufacturing laminated battery electrodes 3, Relationship with person f1 who assists the market Patent Name of applicant Name i (: ¥, ) (610) Akira Co., Ltd. Electric building 4,
Agent 6, Supplement 11: λ・1 of ``Detailed description of the invention'' in the specification. The "Brief Description of Drawings" column and Drawing (1) Detailed Description of the Invention column will be amended as follows. +2) The column "Brief description of drawings" in the specification will be amended as follows. Off N O Lines 17 to 18 “Figure 6 is...
. . . An explanatory diagram of the structure," is corrected to read, "FIG. 6 (Jl) is a plan view of the core plate used in the present invention. %Φ) is an enlarged cross-sectional view of its edge portion." (3) Figures 1 to 6 of the drawings shall be revised in separate sheets. Figure 3 Figure 4 Figure 5 Figure 3 Figure 6 (0) (b) Procedural amendment (voluntary)
51128 11, Indication Patent Application No. 1985-200855 2, Title of invention: Method for producing laminated battery electrode Name + 1 (: ,, 1. (610) Meidensha Co., Ltd. 4, Agent 6, Supplementary Object of the City The "Detailed Description of the Invention" and "Brief Description of the Drawings" columns of the specification l) The following Excerpt Supplement E is added to the detailed description of the invention in the specification. (2) In the 7th negative (brief description of drawings) line 20 (below i/) of the specification, "11... Electrode portion" has been replaced with "11... ...Correct with the IT electrode part.

Claims (2)

[Claims] (1) A method for manufacturing a laminated battery electrode manufactured through a step of integrally molding an electrode portion and an electrode frame portion supporting the electrode portion using a metal part using a heat press, the method comprising:
! The molded product after molding is sandwiched between two sets of asbestos plates, a weight is placed on it, and it is left in the air, cooled to near room temperature, and then core plates are interposed on both sides of the electric part III of the molded product. A method for producing a laminated battery electrode, characterized in that pressing plates are installed on both sides of the electrode part of the molded product via the electrode frame part and the core plate, and the molded product is stacked and slowly cooled. (2) A method for manufacturing a laminated battery electrode according to claim 1, in which a core plate having a round edge portion is used.