JPH01173565A - Cell - Google Patents

Abstract

PURPOSE:To suppress the leakage of an electrolyte during the storage by using amorphous nylon or a material containing it as the material for a sealing body. CONSTITUTION:Amorphous nylon or a material containing it is used as the material for a sealing body 8. The amorphous nylon is excellent in the heat resistance and chemical resistance for its property and also excellent in the mechanical property such as tensile strength. semi-aromatic amorphous polyamide is used as the most preferable material for the leakage resistance. This amorphous polyamide has no crystallization, thus its tensile strength is stronger than that of the conventional crystalline nylon. The leakage of an electrolyte during the long-time storage can be thereby suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a battery with an improved sealing body.

[Prior Art] In recent years, as portable electronic devices such as portable radios, cassettes, and battery-powered electric razors have become smaller, the batteries used in these devices must have high energy density and high reliability. requested. Therefore, the external dimensions of the battery itself are almost limited, so in order to improve the internal structure of the battery and satisfy the two issues mentioned above, the design of the battery sealing part should take up as little volume as possible, and also be airtight. , a structure with excellent liquid tightness is required. Particularly important is the selection of the material for the sealing body.

Therefore, conventionally, for example, in alkaline batteries, olefin materials such as polyethylene which have excellent alkali resistance or polymeric materials such as polyethylene which have excellent tensile strength have been used most often.

[Problems to be solved by the invention] However, although olefin materials such as polyethylene are used as the sealant because they have good molding workability, they are currently most commonly used; In the case of a battery having a structure in which a current collector rod is inserted through the sealing body, it is difficult to maintain the airtightness of the seal on the side of the current collector rod for a long period of time, resulting in a problem of lack of reliability.

Furthermore, when stored at high temperatures, there are drawbacks such as leakage of the electrolyte inside.

On the other hand, when nylon 6 or 66 is used as the material for the sealing body, it has excellent tensile strength and can maintain sufficient sealing properties around the current collector rod, but when inserting the current collector rod into the center of the sealing body, If it is dry, the sealing body may be damaged. Therefore, if a battery is manufactured using such a sealing body, a problem arises in that the electrolyte solution leaks during storage.

This invention was made to solve the above problems, and aims to provide a highly reliable battery that suppresses leakage of liquid during long-term storage.

[Means for solving the gap] In order to achieve the above object, the battery of the present invention is characterized in that amorphous nylon or a material containing the same is used as the material for the battery sealing body.

[Production use] Amorphous nylon has heat resistance in its physical properties.

Since it has excellent chemical resistance and mechanical properties such as tensile strength, it can provide a battery with little leakage over a long period of time.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. In the accompanying drawings, a cylindrical positive electrode 2 mainly made of manganese dioxide is loaded in contact with the inside of a cylindrical positive electrode can 1 made of iron plated with nickel and having a bottomed opening. Furthermore, a negative electrode 4 made of heavy zinc powder gelled with a caustic potassium aqueous solution made viscous with vinylomethyl cellulose is filled in contact with the inside thereof. As a current collector for this negative electrode, a current collector rod 6 electrically connected to a negative electrode cap 5 made of nickel-plated iron is inserted into the negative electrode 4 through the center of a sealing body 8 with a sealing plate 7 interposed therebetween. .

The sealing body 8 is insulating and functions as a backing.

The battery is sealed airtight and liquid-tight.

Semi-aromatic amorphous polyamide is used as the material for the sealing body 8, which is the most important material for leakage resistance in a battery having such a structure. Since this amorphous polyamide has no crystallinity, it has higher tensile strength than conventional crystalline nylon, and the recently developed product name Tsubamitsudo It is representative.

This semi-aromatic amorphous polyamide is manufactured from both aliphatic and aromatic materials, and its physical properties such as heat resistance, chemical resistance, and tensile strength are superior to that of nylon 6. There is. That is, Table 1 is a comparison of the physical properties of nylon 6 and semi-aromatic amorphous polyamide (Tsubamitsudo X21).

Table 1 Therefore, batteries using sealing bodies manufactured from the material of the present invention do not suffer from damage to the sealing bodies that occurs when a current collector rod is inserted, and no leakage occurs during subsequent storage. Therefore, it was possible to provide a battery with extremely excellent leakage resistance compared to batteries using conventional sealing bodies made of nylon 6 and nylon 66 materials.

Furthermore, as a result of manufacturing batteries using conventional manufacturing processes using the alkaline manganese battery sealing material injection-molded using the synthetic resin of the present invention, no problems were observed in workability, and the product had leakage resistance of 93 degrees and humidity. These are the results regarding leak resistance compared under the following conditions.

From the test results shown in Table 2 and above, it can be seen that the sealing material of the present invention has extremely excellent leakage resistance.

The semi-aromatic amorphous polyamide used in this invention is
It has excellent compatibility with other resins, and is particularly easy to mix with nylon 6 or nylon 66, and has the effect of improving the physical properties of nylon. A similar evaluation was conducted.

As a result, it was found that when 20 parts of the resin of the present invention was mixed with nylon, the effect appeared, and when 40 parts was added, the leakage resistance was impaired.

It goes without saying that other combinations are conceivable to the extent that they do not change the gist of the invention.

Table 3 shows 40% aromatic super polyamide and nylon 6
The results are the results of an investigation of leak resistance under the conditions shown in the table below of 100 sealing bodies using the sealing body of the present invention molded by mixing nylon 601 and conventional nylon 6.

Table 3 [Effects of the Invention] As is clear from the above explanation, the battery using the sealing material of the present invention can provide a battery with extremely excellent leakage resistance.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view showing one embodiment of a battery according to the present invention. 1...Positive electrode can 2...Positive starch 3...Seharorator 4...Negative electrode 5...Cap 6...Collector rod 7...Sealing plate 8...Sealing body

Claims (3)

[Claims] (1) A battery characterized in that amorphous nylon or a material containing the same is used as the material of the sealing body. (2) The battery according to claim 1, wherein a mixture of amorphous nylon and crystalline nylon is used as the material for the sealing body. (3) The battery according to claim 1, wherein the material of the sealing body is semi-aromatic non-crystalline nylon.