JPS6271165A - Sealed type lead-storage battery - Google Patents

Abstract

PURPOSE:To suppress the decreasing rate of water content in electrolytic solution by using an electrolytic tank made by injection molding of polypropylene resin to which mica is added. CONSTITUTION:An electrolytic tank, made by injection molding of polypropylene resin to which 40wt%, for example, of non-permeable mica of scale-like shape is added, is used with its surfaces of the scale-like mica particles arranged to be parallel to the wall surface. Because the mica is not permeable, water molecules going to pass the resin at right angles to the wall for forming the electrolytic tank are prevented from going straight by the mica,while being allowed to advance by roundabout routes. Therefore, traveling distance of the water molecules is increased, having the same effect as increasing the wall thickness, and the rate of permeation can be reduced and, in consequence, the decreasing rate of water content can be suppressed to a low level.

Description

【発明の詳細な説明】 産業上の利用分野 、本発明は密閉型鉛蓄電池の改良に関するものである。[Detailed description of the invention] Industrial applications , the present invention relates to improvements in sealed lead-acid batteries.

従来の技術 鉛蓄電池はもともとガラス製の電槽を用いることから始
り、エボナイト電槽が平行して使われていたが、やがて
、プラスチック電槽が多（用いられる様になった。これ
により小型化、軽量化が進歩したが、いずれも密閉型と
しＣ採用されではいなかった。しかし、ビデオカメラを
初めとするエレクトロニクス関係の電源として電池が多
用されるに至り、持ち歩き中に電解液が流出しない様完
全に密閉されることになった。Conventional technology Lead-acid batteries originally started out using glass containers, and ebonite containers were used in parallel, but eventually plastic containers came to be used more frequently. Although progress has been made in making the battery lighter and lighter, all of them are sealed and have not been adopted as a C.However, as batteries have come to be widely used as a power source for video cameras and other electronics, electrolyte leaks out while being carried around. It was decided to be completely sealed to prevent this from happening.

発明が解決しようとする問題点 上記の密閉型電池は電極、電解液を電槽内Ｉζ封入する
ため、基本的に水の補給や電解液濃度の調整を不要にす
る必要がある。しかし、小型化、軽量化のためにプラス
チック電槽の使用を避けることは出来ないので、プラス
チック材質固有の透湿性による水分の減少もまた避ける
ことが出来ないものである。Problems to be Solved by the Invention In the above-mentioned sealed battery, since the electrodes and electrolyte are sealed in the container, it is basically necessary to eliminate the need for water replenishment and adjustment of the electrolyte concentration. However, since the use of plastic containers cannot be avoided in order to reduce size and weight, a decrease in water content due to the inherent moisture permeability of plastic materials is also unavoidable.

鉛蓄電池に於て水分の減少は電池容量を小さくし、また
電池寿命を短かくする等、好ましくない結果となるため
、出来るだけ水分の減少を少くする必要がある。In lead-acid batteries, a decrease in moisture leads to undesirable results such as a decrease in battery capacity and a shortened battery life, so it is necessary to minimize the decrease in moisture as much as possible.

問題を解決するための手段 本発明は上記の点に鑑み、電解液中の水分の減少率を低
くした密閉型鉛蓄電池を提供するもので、雲母を充填し
たポリプロピレン樹脂を射出成形した電槽を使用するこ
とを特徴とするものである。Means for Solving the Problems In view of the above points, the present invention provides a sealed lead-acid battery in which the rate of water loss in the electrolyte is reduced. It is characterized by its use.

作用 ポリプロピレン樹脂は耐熱性が良好なため、高温下での
変形が少く、また透湿性も小さいため、密閉形鉛蓄電池
の電槽に適しているが、ＡＢＳ樹脂に比し弾性率が低い
ため同じ剛性の電槽を得るためには肉厚を増す必要があ
る欠点もあった。し・かし雲母は鱗片−状であるため樹
脂に充填して射出成形すると金型面と雲母の平面が平行
して樹脂中に配列し成形される。雲母は透水性がないの
で電槽を形成する壁面に垂直に樹脂中を通過しようとす
る水の分子は雲母に直進を妨げられ迂回しながら進む。Function Polypropylene resin has good heat resistance, so it is less deformed at high temperatures, and has low moisture permeability, so it is suitable for sealed lead-acid battery cases, but it has a lower elastic modulus than ABS resin, so it is the same. Another drawback was that in order to obtain a rigid battery case, it was necessary to increase the wall thickness. However, since mica is in the form of scales, when it is filled in a resin and injection molded, the mold surface and the plane of the mica are arranged parallel to each other in the resin and molded. Mica has no water permeability, so water molecules that try to pass through the resin perpendicular to the wall surface forming the battery case are prevented from going straight by the mica and proceed in a detour.

したがって水分子の通過行程は長くなり、壁面の肉厚を
増したと同じ効果があり透水率を減じることが出来る。Therefore, the passage of water molecules becomes longer, which has the same effect as increasing the wall thickness, and reduces water permeability.

即ち同一肉厚のポリプロピレン樹脂単体の電槽を使用し
た鉛蓄電池に比し遥かに少い透水率を有する密閉型鉛蓄
電池にすることが出来る。また雲母か樹脂中に壁面に平
行に配列することによりよ（知られＣいる様に樹脂を補
強する効果蓄電池をつくることか出来る。In other words, a sealed lead-acid battery having a much lower water permeability than a lead-acid battery using a single polypropylene resin container with the same wall thickness can be obtained. In addition, by arranging mica or resin in parallel to the wall surface, it is possible to create a storage battery with the effect of reinforcing the resin (as is known in the art).

実施例 １２Ｖ・６．５Ａｈの密閉型鉛蓄電池として、透水性の
ない鱗片状の雲母（スジライト・マイカ　ｌ　５０−８
）を４０重ｆｆ１４充填したポリプロピレン樹脂を射出
成形し、鱗片状の面を壁面に平行に配列させた電槽を使
用した。４０’Ｃの気中にこの電池を３０日間放置した
と社ろ水分の透過による重量減少は１．５グラムであっ
た。Example 1 A 2V/6.5Ah sealed lead-acid battery was made of non-water permeable scaly mica (sugilite mica l 50-8).
) was injection molded with polypropylene resin filled with 40 layers of FF14, and the scaly surfaces were arranged parallel to the wall surface. When this battery was left in air at 40'C for 30 days, the weight loss due to permeation of moisture was 1.5 grams.

比較例としＣ１電槽の材料にポリプロピレン樹脂単体を
用いた以外はすべＣ実施例と同じにしたところ重量減少
は３．３グラムであった。A comparative example was prepared in the same manner as in Example C except that polypropylene resin alone was used as the material for the C1 battery case, and the weight reduction was 3.3 grams.

発明の効果 上述の様に本発明は、透水性のない鱗片状の雲母を充填
したポリプロピし・ン樹脂を射出成形し、鱗片状の面を
壁面に平行に配列させた電槽を用いＣあるため、密閉型
鉛蓄電池内の電解液の水分の減少が少な（電池容量の低
下を防止し寿命を長期化出来る等工業的価値極めて大な
るものである。Effects of the Invention As described above, the present invention uses a battery case made of injection molded polypropylene resin filled with scale-like mica that is not water-permeable, and in which the scale-like surfaces are arranged parallel to the wall surface. Therefore, the decrease in water content of the electrolyte in the sealed lead-acid battery is small (preventing a decrease in battery capacity and prolonging the life of the battery, etc.), which has an extremely large industrial value.

Claims (1)

【特許請求の範囲】[Claims] ポリプロピレン樹脂に雲母を充填し射出成形した電槽を
用いることを特徴とする密閉型鉛蓄電池。A sealed lead-acid battery characterized by using a case made of polypropylene resin filled with mica and injection molded.