JPH04342959A - Battery with organic electrolyte - Google Patents

Abstract

PURPOSE:To prevent internal shortcircuiting and enhance the safety by fixing an electrode body with a sticky tape which uses a soluble adhesion agent in an electrolytic solution, or by coating with a coating agent. CONSTITUTION:A positive electrode 1 is formed by filling a core of Ti or stainless steel with a pos. electrode black mix using MnO2 as the main active substance, followed by drying. A pos. electrode lead plate 4 of the same material is spot welded to the core. A separator 3 is formed by cutting a fine porous sheet of non-woven cloth in band form, and is interposed between the pos. and neg. electrodes 1, 2, and the whole is wound spirally to produce an electrode body. The separator 3a at the exterior extremity of this electrode body is fixed to the next separator 3b by a sticky tape 6 which uses an acrylic adhesion agent soluble in electrolyte. Otherwise, the electrode body is immersed in a solution prepared by dissolving acrylic resin in a fast-drying volatile solvent and pulled up, and the solvent is volatilized, and the whole electrode body surfaces are coated with acrylic resin as binding process. A lower insulation plate 8 is installed on the electrode body, followed by insertion in a cylindrical case 9.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an organic electrolyte battery.
In particular, the present invention relates to an organic electrolyte battery in which a separator is interposed between a negative electrode and a positive electrode, and an adhesive tape for fixing a spiral electrode body is improved.

0002

[Prior Art] In recent years, organic electrolyte batteries have been used as main power sources and backup power sources for various electronic devices because they have high energy density, excellent reliability such as storage stability and leakage resistance, and can be made smaller and lighter. Used as a power source.

[0003] Conventionally, there are two methods for fixing this type of battery after the electrode body has been constructed. The first method, as shown in FIG. 2, is a method in which no adhesive tape for fixing is provided on the electrode body 20. . The second method, as shown in FIG. 3, is to fix the electrode body 20 with an adhesive tape 6 that does not dissolve in the electrolyte. 15
a is the outermost circumferential separator, and 15b is the next outer circumferential separator.

0004

[Problems to be Solved by the Invention] In the conventional configuration, first, in the case of the first method, as shown in FIG. When inserted into the negative electrode case, the negative electrode, positive electrode, and separator (not shown) were inserted into the negative electrode case in various misaligned states, and there was a great risk of causing an internal short circuit. In addition, in the case of the second method, the electrode body 20 is fixed with adhesive tape 6 as shown in FIG. 3, and the product is manufactured with the degree of binding maintained. There was a great risk that a part of the core material (not shown) on the end face of the positive electrode mixture would break through the separator due to expansion of the material (not shown), causing an internal short circuit.

[0005] The present invention solves these problems and aims to provide an organic electrolyte battery which prevents internal short circuits and improves safety.

[0006]

[Means for Solving the Problems] In order to solve these problems, in the organic electrolyte battery of the present invention, one method is to add an adhesive soluble in the electrolyte to the adhesive tape for fixing the electrode body. This is what I used. Another method is to coat the electrode body with a coating agent soluble in an electrolytic solution after constructing the electrode body.

[0007]

[Operation] With this structure, the electrode body of the organic electrolyte battery of the present invention is fixed with adhesive tape or coated with a coating agent, so when inserted into the negative electrode case, the negative electrode, positive electrode, and separator do not fall off and are smooth. In addition, after the electrolyte is injected, the adhesive tape for fixing the electrode body or the coating agent itself dissolves in the electrolyte, releasing the tightness of the electrode body, so that it can be used during battery discharge. This solves the problem that a part of the core material on the end face of the positive electrode mixture breaks the separator due to expansion of the positive electrode mixture, causing an internal short circuit.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a positive electrode plate 1 is made by filling a core material (not shown) made of expanded net made of titanium or stainless steel with a positive electrode composite material containing manganese dioxide as the main active material, and drying it. It is. 4 is a positive electrode lead plate made of the same material as the core material and spot welded to the core material. The negative electrode plate 2 is made of metal lithium, and a negative electrode current collector 5 is crimped onto one side thereof. The separator 3 is a nonwoven fabric made of polypropylene, polyethylene, or a mixture of polypropylene and polyethylene, and a microporous membrane sheet cut into strips. In this example, a polypropylene microporous membrane sheet was used. Next, a separator 3 is interposed between these positive and negative electrodes 1 and 2, and the whole is spirally wound to form an electrode body. Then, similarly to the second conventional method, the separator 3a on the outermost periphery of the electrode body and the separator 3b on the next outer periphery were fixed with an adhesive tape 6 using, for example, an acrylic adhesive soluble in the electrolytic solution of this example. As an example of another method, at the same time as forming the electrode body, the electrode body is immersed in a liquid in which acrylic resin is dissolved in a quick-drying volatile solvent, and then pulled up, and the volatile solvent is evaporated to form the electrode body. The entire surface is coated with acrylic resin and bound. This completes the configuration of the spiral electrode body. Next, the lower insulating plate 8 is attached to the electrode body and inserted into the cylindrical case 9, the positive electrode lead plate 4 and the negative electrode current collector 5 are brought into contact with the sealing plate 10 and the case 9, respectively, and the upper insulating plate 7
After the step 9a is formed on the upper part of the case 9, an electrolytic solution (in this example, lithium perchlorate is dissolved as a solute in a mixed solvent of propylene carbonate and 1,2 dimethoxyethane) is added. used.) Inject. and,
After attaching the sealing plate 10, the open end of the case 9 is caulked to complete the assembly of the battery. Next, the internal short-circuit conditions of the batteries according to this example and the two conventional methods described above, that is, the voltage test after battery assembly, and the internal short-circuit conditions during the discharge test are summarized (Table 1).
). This example product (1) uses the adhesive tape of this example, this example product (2) uses coating treatment, and the conventional product (3) uses no adhesive tape. Conventional product (4) uses a conventional adhesive tape.

0010

[Table 1]

As is clear from Table 1, the electrode body according to this example has an extremely excellent effect of preventing internal short circuits. Note that as resins that can be used other than the acrylic resin used in this example, polybutene resin, butylene terephthalate resin, and methyl methacrylate resin have shown similar effects as a result of various experiments.

0012

Effects of the Invention As is clear from the above description of the embodiments, the organic electrolyte battery of the present invention has the following advantages: Various misalignments of the negative electrode, positive electrode, and separator, and expansion of the positive electrode mixture during discharge due to fixing the electrode body with adhesive tape, etc. while maintaining the tightness can cause damage to the end surface of the positive electrode mixture. This has the effect of preventing a part of the core material from breaking the separator and causing an internal short circuit.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of an organic electrolyte battery according to an embodiment of the present invention.

[Fig. 2] Front view of a spiral electrode body according to the first method of a conventional organic electrolyte battery

[Fig. 3] Front view of a spiral electrode body according to the second method.

[Explanation of symbols]

1 Positive electrode plate 2 Negative electrode plate 3 Separator 3a Outermost separator 3b Next outer periphery separator 6 Adhesive tape 9 Case

Claims (3)

[Claims] [Claim 1] A battery consisting of a negative electrode using a light metal as an active material, a positive electrode, and an organic electrolyte, the electrodes being spirally wound with a band-shaped separator interposed between them. An organic electrolyte battery that uses adhesive tape that uses an electrolyte-soluble adhesive as the adhesive for the outermost adhesive tape that fixes the electrode body. [Claim 2] A battery comprising a negative electrode using a light metal as an active material, a positive electrode, and an organic electrolyte, the battery comprising a strip-shaped separator interposed between the two electrodes and wound spirally. An organic electrolyte battery in which the electrode body is coated with a substance soluble in the electrolyte. [Claim 3] Claim 1, wherein the adhesive or coating agent soluble in the electrolytic solution is an acrylic resin, a polybutene resin, a butylene terephthalate resin, or a methyl methacrylate resin.
, 2. The organic electrolyte battery according to .