JPS60172163A

JPS60172163A - Storage battery

Info

Publication number: JPS60172163A
Application number: JP59029118A
Authority: JP
Inventors: Kazumi Mori; 森　和三
Original assignee: Yuasa Corp; Yuasa Battery Corp
Current assignee: Yuasa Corp
Priority date: 1984-02-18
Filing date: 1984-02-18
Publication date: 1985-09-05

Abstract

PURPOSE:To make a container and a cover thin and light weight without decrease in rigidity by forming them with a low foam synthetic resin. CONSTITUTION:Stearic acid, salicylic acid, or amino acid is added to polyolefin family synthetic resin as a foaming agent and the resin is made to foam so as to have 5-25% porosity. A container and a cover are molded by injection of the foam resin. A plate group is accommodated into the container, and the container and the cover are melt-bonded. When the resin having a porosity of 25% or more is used, the deformation is minimum and almost constant. When the resin has a porosity of 5% or less, the effect of foaming is small. When 5-20% of quartzite is added to the low foam polyolefin family synthetic resin as reinforcing filler, rigidity of the container and cover is increased.

Description

【発明の詳細な説明】本発明は蓄電池電槽及び蓋の剛性強化に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to strengthening the rigidity of a storage battery case and lid.

近年蓄電池の軽量化が進むに従い、ポリオレアイン系合
成樹脂等で形成された１１Ｌ槽及び蓋は著しく薄撤軽量
化されている。しかし、この薄型軽量化された１槽及び
蓋を密閉形蓄電池の如く内圧上昇を伴う蓄電池に使用し
た場合には、電槽と蓋の変形及び両者の接着部の異状等
が発生するという欠点があった。As storage batteries have become lighter in weight in recent years, 11L tanks and lids made of polyolein-based synthetic resins have become significantly thinner and lighter. However, when this thinner and lighter container and lid are used in storage batteries with increased internal pressure, such as sealed storage batteries, there are drawbacks such as deformation of the container and lid and abnormalities in the bonded parts between the two. there were.

本発明は上記欠点を解消したもので、以下一実施例によ
り詳述する。本発明蓄電池に使用する電槽及び蓋は、５
〜２５％の気孔率を有する低発泡ポリオレフィン系合成
樹脂よりなる。次に本発明蓄電池の製造方法を説明する
と、先ずポリオレフィン系合成樹脂材料に発泡剤として
ステアリン酸、サルチル酸、アミン酸等を添加して、５
〜２５％の気孔率に発泡させた後、インジェタシ目ン成
形して電槽及び蓋を成形し、極群を挿入後、両者を熱溶
着する。気孔率の調整は発泡剤の添加量により調整でき
る。即ち、゛添加量を増加させると気孔率が増加し、逆
に添加量を減少させると気孔率は減少する。第１図は電
槽の気孔率と変形量の関係のグラフ、第２図は測定に使
用した電槽の外観斜視図であり、該電槽は縦旧２５Ｈ１
横（Ｗ）７０鰭、高さくＨ）８５罪、厚さくＴ）３．５
ｆｉのポリプ冒ピレン製を使用した。変形■の測定は、
室温２０℃において該電槽に内圧を加えて、側壁Ａの中
央部における変形量を測定した。第１図において、１は
内圧１ｋｇ／ｃｄ、２は内圧０．５　ｋＱｌｃｒ！　ｃ
Ｄ場合の関係テする。第１図より明らかな如く、気孔率
が２５％以上になると変形量は最小値ではぼ一定となり
、５％未満ではその効果が小さい。また、前記低発泡ポ
リオレフィン系合成樹脂に５〜２０％の珪石粉末等の充
填補強材を含有させれば、更に電槽及び蓋の剛性を強化
することができる。The present invention eliminates the above-mentioned drawbacks, and will be explained in detail below using an example. The battery case and lid used in the storage battery of the present invention are 5
Made of low foam polyolefin synthetic resin with a porosity of ~25%. Next, to explain the manufacturing method of the storage battery of the present invention, first, stearic acid, salicylic acid, amino acid, etc. are added as a blowing agent to a polyolefin-based synthetic resin material.
After foaming to a porosity of ~25%, the battery case and lid are formed by injection molding, and after inserting the electrode group, the two are thermally welded. The porosity can be adjusted by adjusting the amount of blowing agent added. That is, ``If the amount added increases, the porosity increases, and conversely, if the amount added decreases, the porosity decreases. Figure 1 is a graph of the relationship between the porosity and deformation of the battery case, and Figure 2 is a perspective view of the exterior of the battery case used for measurement.
Width (W) 70 fins, height H) 85 sins, thickness T) 3.5
fi polypropylene was used. Measurement of deformation ■
An internal pressure was applied to the container at a room temperature of 20° C., and the amount of deformation at the center of the side wall A was measured. In Figure 1, 1 is the internal pressure of 1 kg/cd, and 2 is the internal pressure of 0.5 kQlcr! c.
Let's look at the relationship in case D. As is clear from FIG. 1, when the porosity is 25% or more, the amount of deformation becomes almost constant at the minimum value, and when it is less than 5%, the effect is small. Further, if the low foaming polyolefin synthetic resin contains 5 to 20% of a filling reinforcing material such as silica powder, the rigidity of the battery case and lid can be further strengthened.

本発明は上述の如く、蓄電池電槽及び黴が５〜２５％の
気孔率を有する低発泡台ｍ！脂より形成されているため
、該電槽及び蓋の剛性を落すことなく薄型軽量化できる
。また、従来の厚さの電槽及び蓋を形成した場合でも、
気孔部を有するためその分軽呈化できる。As described above, the present invention provides a storage battery container and a low-foaming base in which the mold has a porosity of 5 to 25%! Since it is made of oil, the battery case and lid can be made thinner and lighter without reducing their rigidity. In addition, even when forming a container and lid of conventional thickness,
Since it has pores, it can be made lighter.

[Brief explanation of the drawing]

第１図は電槽の気孔率と変形量の関係のグラフ）第２図
は電槽の外観斜視図である。出願人　湯浅電池株式会社第２図Fig. 1 is a graph of the relationship between the porosity and the amount of deformation of the battery case)) Fig. 2 is an external perspective view of the battery case. Applicant: Yuasa Battery Co., Ltd. Figure 2

Claims

[Scope of Claims] 1) A storage battery characterized by a battery case and a lid made of a low-foaming synthetic resin having a porosity of 5 to 25%. 2) The low-foaming synthetic resin is a polyolefin-based synthetic resin. The storage battery according to claim 1. 5) The storage battery according to claim 1 or 2, wherein the low foaming synthetic resin contains a reinforcing material.