JP2005203317A - Synthetic resin battery case for storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a synthetic resin battery case for a storage battery in which not only the partition walls but also the outer walls are formed excellently. <P>SOLUTION: A plurality of cell chambers 4 are provided integrally at the outer walls 2 by dividing by partition walls 3 by an injection molding method. A recessed part 6 which continues in the direction of row of the cell chambers 4 is provided on the outer surface of the bottom part 5 of the battery case 1 and injection gate remains 7a, 7b are provided inside this recessed part 6. The injection gate remains 7a, 7b exist immediately underneath the position corresponding to the partition walls 3 and toward inside than immediately underneath the position corresponding to the outer walls 2 parallel to the partition walls 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a synthetic resin battery case for a storage battery in which a plurality of cell chambers are integrally formed by an injection molding method.

A conventional synthetic resin battery case for a storage battery has about 2 to 6 injection gates on the outer surface of the bottom of the battery case, and the position thereof is a thin part directly below each partition wall (see Patent Document 1).
JP-A-6-275246 (FIGS. 4 to 6)

  However, the synthetic resin battery case for a storage battery having such a structure has a problem that the resin wrap-around performance to the outer wall is poor, a short shot of the outer wall occurs, and the quality stability of the outer wall is difficult to obtain. Further, since the resin is injected in the order of the bottom of the battery case → the partition wall, there is a problem that the cycle time of molding becomes long.

  The objective of this invention is providing the synthetic resin battery case for storage batteries which can form not only a partition but an outer wall favorably.

  Another object of the present invention is to provide a synthetic resin battery case for a storage battery that can be efficiently manufactured.

  The present invention is directed to a synthetic resin battery case for a storage battery in which a plurality of cell chambers are integrally formed by partitioning in an outer wall by an injection molding method.

In the synthetic resin battery case for a storage battery according to the present invention,
On the outer surface of the bottom of the battery case, there is a recess that is continuous in the direction in which the cell chambers are arranged, and an injection gate mark in the recess,
The injection gate trace is present immediately below a position corresponding to the partition wall and on an inner side of a position corresponding to the outer wall parallel to the partition wall.

  As in the case of the synthetic resin battery case for storage battery according to the present invention, the injection gate trace is provided on the inner side from directly below the position corresponding to the outer wall parallel to the partition wall, besides just below the position corresponding to the partition wall. In addition to the resin supply to the partition walls, the resin supply to the outer wall is also performed satisfactorily, and a battery case free from short shots can be obtained. In addition, since the resin is supplied to the partition walls and the resin is supplied to the outer wall well, the molding cycle time is shortened, and a battery case that can be efficiently manufactured can be obtained. In particular, since the injection gate trace is provided on the inner side from directly below the position corresponding to the outer wall parallel to the partition wall, the weld wall (welded to the outer wall at the time of resin injection and weak in the portion where the cooled resins collide with each other) The phenomenon that a turbulent pattern is formed) can be made difficult. Further, when the injection gate trace is provided on the inner side from directly below the position corresponding to the outer wall parallel to the partition wall, it is possible to prevent the injection gate trace from being visible from the outside of the outer wall.

  FIGS. 1 to 3 show the best mode for carrying out a synthetic resin battery case for a storage battery according to the present invention. FIG. 1 is a plan view of the synthetic resin battery case for a storage battery of this example as viewed from the bottom side. 2 is a side view thereof, and FIG. 3 is a perspective view thereof.

The synthetic resin battery case 1 for a storage battery of this example is partitioned by a plurality of partition walls 3 in an outer wall 2 and a plurality of cell chambers 4 are integrally formed. On the outer surface of the bottom 5 of the battery case 1, there are concave portions 6 that are continuous in the direction in which the cell chambers 4 are arranged, and injection gate traces 7 a and 7 b in the concave portions 6. Each injection gate trace 7 a is provided directly below a position corresponding to each partition wall 3. Each injection gate trace 7b
They are respectively provided on the inner side (near the partition wall 3 side) from directly below the position corresponding to the outer wall 2 parallel to each partition wall 3.

  In this way, the injection gate trace 7a is provided directly below the position corresponding to each partition wall 3, and each injection gate trace 7b is provided on the inner side from directly below the position corresponding to the outer wall 2 parallel to each partition wall 3. Therefore, not only the resin is supplied to each partition 3 but also the resin is supplied well to the outer wall 2, and the battery case 1 free from short shots can be obtained. Further, since the resin is supplied to each partition wall 3 and the resin is supplied to each outer wall 2 well, the molding cycle time is shortened, and the battery case 1 that can be manufactured efficiently can be obtained.

  Also in this example, since each injection gate trace 7a is provided directly below the position corresponding to each partition wall 3, the injection time of the resin to each partition wall 3 and the bottom portion 5 can be made equal. From this, the molding time of the battery case 1 could be shortened from the conventional 45 seconds to 30 seconds.

  Further, in the conventional molding of the battery case 1, the short shot phenomenon that the resin solidifies before the resin can not reach the outer wall 2 frequently occurs. However, according to the present invention, this short shot phenomenon is also generated. Can be prevented.

  In particular, since the injection gate trace 7b is provided on the inner side from directly below the position corresponding to the outer wall 2 parallel to the partition wall 3, it is possible to make it difficult to weld the outer wall 2. Further, when the injection gate trace 7b is provided closer to the inside than directly below the position corresponding to the outer wall 2 parallel to the partition wall 3, the injection gate trace 7b is prevented from being visible from the outside of the outer wall 2. Can do.

It is the best form for implementing the synthetic resin battery case for storage batteries which concerns on this invention, and is the top view which looked at this battery case from the bottom part side. It is a side view of FIG. FIG. 2 is a perspective view of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Synthetic resin battery case for storage batteries 2 Outer wall 3 Bulkhead 4 Cell chamber 5 Bottom 6 Recess 7a, 7b Injection gate trace

Claims (1)

A synthetic resin battery case for a storage battery in which a plurality of cell chambers are integrally formed by partitioning in an outer wall by an injection molding method,
On the outer surface of the bottom of the battery case, there is a recess that is continuous in the direction in which the cell chambers are arranged, and an injection gate mark in the recess,
The injection gate mark is present immediately below a position corresponding to the partition wall and on an inner side of a position corresponding to the outer wall parallel to the partition wall, and is located on the inner side.

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