JP2590511B2 - Manufacturing method of storage battery - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a so-called monoblock storage battery in which a plurality of 2V cells are housed in a battery case via partition walls and connected through each partition wall.

Conventional technology and its problems In a monoblock storage battery, connecting adjacent cells with a flat-plate-shaped connection means connecting the adjacent cells with the shortest distance, minimizing the electrical resistance between the cells. Therefore, it is an ideal connection method, and various proposals have been made conventionally.

In the old days, there is JP-A-47-27336, followed by JP-A-50-49635, JP-A-50-47140, and JP-A-50-47140.
-152254 JP, JP-A-56-114279, JP-A-58-114
No. 19858 and the like. However, these methods use an electric resistance welding method in which liquid tightness is not sufficiently ensured in the partition penetration portion, and in practice, the pressure during electric resistance welding does not work well, so that there is a problem in the welding itself. There are some that require extra auxiliary parts, and some that inject a sealing material. However, they have the drawback that they require a single assembling man-hour or overlap, and are not industrialized.

Recently, as an improvement proposal of the above-mentioned conventional one, JP-A-62-15
No. 7674 was proposed. This is a method in which the electrode plate group is pushed into the battery case while the residual heat temperature when the connection body is formed by welding is higher than the softening temperature of the battery case partition wall, and the partition wall is melted and press-fitted by the residual heat of the connection body. is there.

However, there are the following disadvantages in industrializing this.

(1) When the production line is stopped while the product is flowing through the production line, all the products whose residual heat of the connecting body is lower than the softening temperature of the battery case partition wall cannot be assembled.

(2) The volume of “the cross-sectional area of the connection body × the thickness of the partition wall” sinks into the partition wall, and a large pressing force is applied to the partition wall from above, and partially. Usually, the partition is designed to have a thickness of 1.0 to 1.4 mm. Therefore, after inserting the electrode group into the battery case, the partition wall is greatly curved near the partition wall into which the connection body has been fitted, and when the battery case and the lid are welded, the partition wall of the cover and the partition wall of the battery case are partially formed. In many cases, the deviation occurs frequently (generally, this is referred to as the deviation of the partition wall, and even in the current production, there is a slight occurrence).

(3) The residual heat temperature when the connection body is formed by welding is
The electrode group must be pushed into the battery case while the temperature is higher than the softening temperature of the battery case partition wall. In the case of a battery having a small heat capacity, such as a storage battery for a motorcycle, it is difficult to apply to a mass production line because the cooling speed of the connector is high.

Object of the Invention The present invention is to provide a method for manufacturing a storage battery in which all the above-mentioned disadvantages are eliminated.

Configuration of the Invention The present invention is a method for manufacturing a storage battery as described in the claims.

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional front view of a main part during the production of a storage battery according to the present invention.
First, a monoblock type battery case 1 made of a thermoplastic synthetic resin
And a plurality of electrode plate groups 2 and a heating hot plate 3 are prepared. The monoblock type container 1 is partitioned by partition walls 4 to form a plurality of cell chambers 5, and each partition wall 4 has a cutout 6 at a staggered position. The electrode plate group 2 is composed of a plurality of positive and negative electrode plates 7 and separators 8, and the positive and negative electrode plate groups of adjacent cells are integrally connected to each other by a connector 9, and the width dimension A of the connector 9 is notched. Larger than the width B of the portion 6 (A>
B) It is formed. Next, the electrode plate group 2 connected integrally is inserted halfway into each cell chamber 5 of the monoblock type container 1. At this time, the polarity of the electrode group 2 and the continuity of the separator 8 are checked. If there is any abnormality, the electrode group 2 is pulled out and repaired. Thereafter, the connecting plate 9 is heated by pressing the hot plate 3 against the upper part of the connecting member 9 (FIG. 1). At this time, hot plate 3
It is desirable to set the temperature to 330 to 370 ° C. and the heating time to 10 to 30 seconds. After that, by pushing the connecting body 9 using the hot plate 3, the electrode plate group 2 is inserted into each cell chamber 5 and the connecting body 9 is pushed into the notch 6. The peripheral partition 10 is melted, and the connector 9 is brought into close contact with the peripheral partition 10. At the same time, the upper part 11 of the monoblock type container 1 is melted by the hot plate 3 (FIG. 2). Thereafter, a lid 12 made of a thermoplastic synthetic resin is pressed against the upper part 11 of the monoblock-type battery case 1 to thermally weld them (heat seal) (FIG. 3).

The set temperature of the hot plate 3 is suitable for heating and welding the battery case 1 and the lid 12. The battery case 1 and the lid 12 are made of polypropylene resin. For this reason, if the temperature is low, the polypropylene resin adheres to the hot plate, and if the temperature is high, the properties are deteriorated and the welding strength is weakened. The heating time is appropriately determined according to the volume of the connection body 9. Connection 9 volume = 2250 (Length 45 x width 10 x
Thickness 5) In the motorcycle battery of mm ^3, the hot plate temperature 360
When the electrode group 2 was inserted at a temperature of 20 ° C. and a heating time of 20 seconds, a satisfactory connection portion 9 was obtained in which the peripheral partition portion 10 of the cutout 6 was appropriately melted at the partition penetration portion of the connection body 9. Was done. The currently used heating and welding equipment for the battery case 1 and the lid 12 is such that the battery case 1 and the lid 12 are partially melted by the hot plate 3, and then the battery case 1 and the lid 12 are pressed (welded). Is performed automatically. In the above, if the connecting body 9 is heated by the hot plate 3 for a certain period of time by modifying the control timer before the battery case 1 and the lid 12 are heated, the conventional equipment remains the same. It can be diverted.

In the above-described embodiment, the connecting body 9 has a flat shape, but the present invention is not limited to this, and various modifications can be considered.

Advantages of the Invention (1) Since the entire periphery of the inter-cell penetrating portion of the connector is in close contact with the molten thermoplastic synthetic resin, the liquid-tightness of the inter-cell penetrating portion can be completely ensured.

(2) Since the electric resistance welding method or the like is not used, there is no possibility that the connection body will come off at the intermediate portion.

(3) Not only does not require an auxiliary part to form the inter-cell penetration part, but it is also unnecessary to provide a filling material by the injection molding method or to fill a thermosetting synthetic resin filler. It is. Accompanying this, the cost required for parts or materials and the number of assembly steps can be significantly reduced.

(4) Since the polarity of the electrode plate group and the continuity of the separator can be checked in the process before the connection body is brought into close contact, any defective products hit by the check can be repaired and reproduced.

(5) Since the connection body is accommodated in the notch having a width slightly smaller than that of the connection body, a margin for melting the partition wall can be reduced.
That is, a strong pressing force is not applied to the partition from above by the connecting body. Therefore, almost no curvature of the partition wall occurs.

(6) Since the connecting body is heated by the hot plate, even a battery having a connecting body with a small heat capacity, such as a storage battery for a motorcycle, can be applied to a mass production line.

(7) The connection body is heated with a heating plate when the battery case and the lid are heated and welded. Therefore, not only special equipment for heating the connection body is not required, but also the heating welding equipment for heating and welding the battery case and the lid, which has been conventionally used, can be reused by completely remodeling the equipment.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a main part of a storage battery being manufactured according to the present invention, FIG. 2 is a vertical front view of a main part in a state where an electrode plate group is completely inserted into a cell chamber, and FIG. FIG. 3 is a longitudinal sectional front view of a main part in a state where is welded. 1: Monoblock type battery case, 2: Electrode group 3: Hot plate, 4: Partition wall, 6: Notch 9: Connection body, 12: Lid

Claims (1)

(57) [Claims] 1. A monoblock-type container made of a thermoplastic synthetic resin, a plurality of electrode plates, and a heating plate for heating are prepared, and the monoblock-type container is partitioned into a plurality of cell chambers by partition walls. The partition is provided with a notch, the electrode group is a plurality of positive,
Consisting of a negative electrode plate and a separator, the positive and negative electrode plate groups of adjacent cells are integrally connected to each other by a connector,
The width of the connecting body is formed to be larger than the width of the notch, and when the electrode plate group connected integrally is inserted into each cell chamber of the monoblock type container, the hot plate is connected to the connecting body. After heating the connecting body by pressing it on the upper part, the connecting body is pushed into the cell chambers by pushing the connecting body using the hot plate, and the connecting body is pushed into the notch. Melting the peripheral partition of the notch by the heated connector, bringing the connector into close contact with the peripheral partition, and simultaneously melting the upper portion of the monoblock-type container with the hot plate; A method for producing a storage battery, wherein a lid made of a plastic synthetic resin is pressed against the upper portion of the monoblock type battery case to thermally weld them.