JPS5827476Y2 - Storage battery case - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a battery case formed by blow molding.

Conventionally, in a molded battery case manufactured by blow molding, the thickness of the battery case wall a is as shown in Figure 1. As it gradually reaches both ends, the thin wall parts a -2, a at both ends of the meat.
-2, and therefore, it is inevitable that the inner surface of the container wall a as a whole is formed into a gently protruding curved surface with the top at the center.

Therefore, when a group of electrode plates is housed in this battery case, the center of each surface b-1 at both ends is supported only by the thick top surface P at the center of the battery case wall a, and is compressed only by the iron part. This results in

Therefore, during long-term use, the front plate becomes curved and cannot be maintained in a flat state, and the support from the battery case wall is not sufficient, and the electrode plates may move within the battery case due to shocks received while the battery is in use. This has the disadvantage of causing short circuits and other inconveniences.

The present invention relates to an improvement of this type of blow-molded battery case that eliminates the above drawbacks, and is capable of stably supporting and holding both ends of the electrode plate group inserted therein over almost the entire surface without bending. The purpose is to provide a storage battery case that can maintain good electrolyte flow between both ends of the electrode plate group and the bearing surface, and the electrode plate group 2 is housed inside the battery case formed by blow molding. Each of the battery case walls 1.1 facing both end surfaces 3, 3 has an intermediate wall portion 1a having an arc-shaped inner surface, and both end walls 1.
Each of the inner surfaces of b and lb is formed into a flat wall surface coplanar with the top surface of the arcuate wall surface of the intermediate wall portion 1a, and the intermediate wall surface 1a
The top surface of the arcuate wall surface and the flat surfaces of the end walls 1b, lb, the central portion 3a and both end portions 3b, 3b of each end surface 3 of the electrode plate group 2.
Between each end surface 3 of the electrode plate group 2 and each battery case end wall 1, there is provided an arc-shaped wall surface of the intermediate wall portion 1a and each end wall portion 1b on both sides thereof. By this, groove spaces 4, 4 extending in the vertical direction are formed.

An example of implementing the present invention will be described with reference to FIGS. 2 and 3.

By blow molding an appropriate thermoplastic synthetic resin as a material, the intermediate wall portion 1a of the wall 1 is formed so that the center thereof It has a maximum thickness part P and its inner surface is an arcuate wall surface, and each of the inner surfaces of the thin wall parts 1b and lb at both ends thereof is the intermediate wall part 1a.
It is formed on a flat wall surface that is flush with the top surface of the arcuate wall surface of the intermediate wall portion 1a, and a recessed space 4, 4 extending in the vertical direction is defined by the arcuate wall surface of the intermediate wall portion 1a and each end wall portion 1b on both sides thereof. Form.

When the electrode plate group 2 is housed in the battery case formed in this way, as is clear from the drawing, both ends 3b of the end surface 3 are placed on each of the end surfaces 3, 3.

3b is supported by the thin end portions 1b and lb inner surfaces of the container wall 1, and the central surface portion 3a of the end surface 3 is immovably housed in a state supported by the arcuate top surface of the intermediate wall portion 1a. On the other hand, between each end surface 3 of the storage electrode plate group 2 and the corresponding supporting wall surface 1 of the battery case, groove spaces 4, 4 extending in the vertical direction are secured, as is clear from FIG. This ensures vertical flow of the electrolyte.

That is, when looking at this as a whole, both end surfaces 3.3 of the electrode plate group 2 are flattened by the arc-shaped top surface of the intermediate wall portion 1a of each container wall 1 and the inner surfaces of both end wall portions 1b and lb. Since it is supported and held over almost the entire surface, the electrode plate group 2 does not deform during use, and has the effect of being extremely stable and strong against vibrations, shocks, etc.

In this way, according to the present invention, each of the opposing battery case walls 1, 1 supporting the both end surfaces 3, 3 of the storage electrode plate group 2 of the battery case molded by blow molding is formed in a circle of the intermediate wall portion 1a. An arcuate inner surface and both end walls 1b on both sides thereof on the same plane as the top surface of the arcuate inner surface.
, lb, both end faces 3 of the electrode plate group 20
.
The vertically extending concave spaces 4.4 formed between a and both sides thereof ensure a vertical electrolytic solution flow path between both end surfaces 3, 3 of the electrode plate group 2 supported by the electrode plate group 2. It has the following effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional molded battery case, FIG. 2 is a perspective view of an example of the present invention, and FIG. 3 is a cross-sectional view thereof. 1...Battery case wall, 1a...Intermediate wall part, l
b, lb... Both end walls, 2... Plate group, 3... Plate group end surface 3a... Center surface of the electrode plate group, 3b , 3b...Both end surfaces of the electrode plate group,
4... Concave space.

Claims (1)

[Scope of utility model registration request] In each of the battery case walls 1.1 facing both end surfaces 3, 3 of the electrode plate group 2 housed inside the battery case formed by blow molding, the inner surface of the intermediate wall portion 1a is formed into an arcuate wall surface. At the same time, each of the inner surfaces of the end walls 1b, 1b is formed into a flat wall surface coplanar with the top surface of the arcuate wall surface of the intermediate wall portion 1a, and the top surface of the arcuate wall surface of the intermediate wall portion 1a is and its both end walls 1
b, one whose flat surfaces lb support the central portion 3a and both end portions 3b, 3b of each end surface 3 of the electrode plate group 2; each end surface 3 of the electrode plate group 2 and each battery case end wall; A storage battery case comprising grooved spaces 4, 4 extending vertically between the arc-shaped wall surface of the intermediate wall portion 1a and the end wall portions 1b on both sides thereof.