JPS61176052A - Enclosed lead storage battery - Google Patents

Abstract

PURPOSE:To prevent shaking and shifting of a unit cell in a case by folding in heat-deposited parts existing around a group of electrode plates, so as to be arranged to make contact with a group of electrode plates or the case. CONSTITUTION:A group of electrode plates comprising positive plates, negative plates, and separators are inserted into a sack-shaped armor 2 made of acid- proof films with heat-deposition property. Next the end parts of electrode poles 3 and 3' are taken out from the opening of the armor 2. Succeedingly, the space between the armor 2 and electrode poles 3, 3', and the mutual film space on the bottom opening part are heated from the outside by a heat-depositing press, and then a battery jar is formed by depositing the mutual films to make a battery, into which electrolyte is poured through the opening parts 2e of projecting parts 2d partially provided with no deposition. Moreover when plural cells in the battery are electrically connected together, heat-deposited parts 2f existing around a group of electrode plates are folded in so as to be arranged to make contact with a group of electrode plates, and each unit cell is fixed inside the case 8. Hence, shaking and shifting of the unit cell in the case can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a sealed lead-acid battery, and particularly to a case in which a single cell or a plurality of cells exteriorized with a film-like or sheet-like synthetic resin are prepared separately. This relates to a sealed lead-acid battery housed in a.

Conventional technology As a measure to reduce the cost of storage batteries, monoblock cases molded from synthetic resins such as ABS resin have been replaced with thermoplastic resins in the form of films or sheets as shown in Figure 3.
For example, several proposals have been made for use in place of the bag-like exterior body 2 made of polyethylene 1. In this case, an electrode plate group 7 consisting of a positive electrode plate 4 with a resin-coated pole post 3 welded to the upper part, a negative pole plate 6 and a separator 6 to which the pole post 3' is fully welded is acid-resistant and heat-weldable. It is inserted through the bottom opening 2a of the bag-like exterior body 2 made of synthetic resin in the form of a film or sheet, and the opening 2b at the top of the bag-like exterior body 2;
20, the tips of the pole posts 3, 3' are made to protrude outward, and then the bag-like exterior body 2 and the pole post 3.

3' and the bottom opening 2a are sealed by heat welding.

After sealing, the unwelded convex portion 2d serves as a safety valve for the bag-like exterior body.
A predetermined amount of electrolyte is injected through the opening 2e to form a single cell, and as shown in Fig. 4, the multiple cells are electrically connected and housed in a case 8 made of ABs resin or polypropylene, etc., and terminals 9 are attached. Cover 1Q was used to cover case 8, and both parts were fixed with adhesive or the like. FIG. 5 is a plan view with the cover removed.

Problems to be Solved by the Invention However, as shown in FIG. 5, the exterior body heat-welded portion 2f around the electrode plate group is made of a film-like or sheet-like exterior body material, and is easily deformed and does not have self-retention properties. Therefore, when multiple cells are housed in a case, (1) each single cell will wobble when subjected to impact, etc., and will be likely to move within the case.

(2) If a single cell moves, in the worst case, the electrical connection between the cells will be severed.

It had the disadvantage of being weak against photography and shock.

The present invention solves the above-mentioned conventional problems, and aims to provide a highly reliable sealed lead-acid battery with excellent vibration resistance and impact resistance.

Means to solve problems In order to achieve the above object, the present invention provides a positive electrode plate.

The electrode plate group consisting of the negative electrode plate and the separator is entirely sandwiched between acid-resistant and heat-weldable film or sheet synthetic resin, and the synthetic resin around the electrode plate group is partially unwelded. In a sealed lead-acid battery in which a single cell or multiple cells are housed in a separate case, the unwelded part is used as a liquid injection port and a safety valve, and the heat welded part around the electrode plate group is folded in. , is characterized in that it is arranged so as to be in contact with the electrode plate group or the case.

Function: By folding the heat-welded parts around the electrode plate group in this way, it is possible to completely prevent cell rattling and movement, and
Impact resistance can be increased.

Example An embodiment of the present invention will be described below with reference to the drawings.

As in the conventional example shown in FIG. 3, the electrode plate group 7 consists of one positive electrode plate 4, two negative electrode plates S, and a glass fiber manotro,
It is inserted through the bottom opening 2a of the bag-like exterior body 2 made of two polyethylene films with a thickness of 0.3H that are acid-resistant and heat-sealable, and the poles are inserted through the openings 2b and 2c at the top of the bag-like exterior body 2. Take out the tips of 3 and 31, and then remove the bag-like exterior body 2.
The area between the pole pillar 3゜3' and between the films at the bottom opening 2& is heated from the outside using a heat welding press, and the polyethylene films are welded to each other in an attempt to generate electricity. A predetermined dilute sulfuric acid electrolyte is injected through the opening 20 of the convex portion 2d to form a battery. A plurality of these batteries are prepared, and the polarities of the batteries are electrically connected and housed in a case 7 made of BS resin, polypropylene, or the like. FIG. 1 is a plan view of a storage battery in a first embodiment of the present invention with the cover removed. As shown in Fig. 1, each single cell is fixed in the case 8 by folding in the heat-welded part 2f around the electrode plate group and placing it in contact with the electrode plate group when making all the electrical connections for multiple cells. be done. In addition, as shown in FIG. 2, even if the heat-welded portion 2fi around the electrode plate group is folded in and placed in contact with the case 8, each single cell is fixed within the case 8 (second embodiment). A vibration resistance performance test was conducted on 50 batteries each of the conventional battery, the batteries shown in the first example, and the second example. 100 per minute with a total amplitude of 4
The voltage of the battery was measured after 0 vibrations were applied continuously in any direction for 24 hours, and the number of batteries in which voltage abnormality occurred was investigated, and the results shown in Table 1 were obtained.

Table 1 As shown in Table 1, out of the 60 test batteries, two had voltage abnormalities in the conventional example, whereas no voltage abnormalities occurred in the first and second embodiments. .

Next, 20 batteries each of the conventional example, the batteries shown in the first example, and the batteries shown in the second example were prepared and their impact resistance performance was tested. The voltage was measured after being dropped onto a 10 ff thick hardwood tree from a height of 91 cm in any direction downward, and the number of times until voltage abnormality occurred was investigated, and the results shown in Table 2 were obtained.

Table 2 As a result of testing with a maximum of 10 drops, voltage abnormalities occurred after 2 or 3 drops in the conventional case, but
In the case of the first and second examples, no voltage abnormality occurred even after being dropped 10 times.

From the results of the vibration resistance performance test and the impact resistance performance test, as shown in the first example and the second example, the thermally welded portion around the electrode plate group in a sealed lead-acid battery using a bag-like exterior body was By folding it and placing it on the surface that contacts the electrode plate group or the case, it is possible to provide a buffering effect and make the battery resistant to vibrations and shocks.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) By folding the heat-welded portion around the electrode plate group and placing it on the surface that contacts the electrode plate group or the case, rattling and movement of the single cell within the case can be prevented.

(2) The folded heat-welded part around the electrode plate group acts as a cushioning material, increasing vibration resistance and impact resistance, and improving reliability.

(3) Unnecessary space between the electrode plate group and the case can be eliminated, and the case can be made into a smaller shape, making it possible to increase volumetric efficiency.

[Brief explanation of drawings]

Figures 1 and 2 are plan views of a sealed lead-acid battery 'f,' housed in a case using a bag-like exterior body according to an embodiment of the present invention, and Figure 3 is a plan view of a conventional bag-like exterior body. FIG. 4 is a perspective view of a part of the sealed lead-acid battery used, FIG. 4 is a perspective view of a storage case housing the battery, and FIG. 5 is a plan view of the battery housed in the case. 2... Bag-shaped exterior body, 3, 31... Pole column, 4... Positive electrode plate, 6... Negative electrode plate, 6.
... Separator, 7 ... Plate group, 8 ...
...Storage case. 〜℃Chijuyumi-riN〜N. @0 J: Ward 3 Figure 46.5 (-1, -11)

Claims (1)

[Claims] An electrode plate group consisting of a positive electrode plate, a negative electrode plate, and a separator is sandwiched between acid-resistant and heat-weldable film-like or sheet-like synthetic resin bodies, and a part of the synthetic resin body around the above electrode plate group is not welded. It is a sealed lead-acid battery in which a single cell or multiple cells are housed in a separately prepared case, with the unwelded part being heat welded to form an exterior body, and the unwelded part serving as a liquid injection port and safety valve. A sealed lead-acid battery characterized in that the heat-welded part around the electrode plate group is folded in, and the folded part is arranged so as to be in contact with the electrode plate group or the case.