JPS60131774A - Manufacture of lead acid battery - Google Patents

Abstract

PURPOSE:To easily insert a plate group with plate group compressed into a container by pressing plastic plates to both sides parallel to plates of a plate group at a specified pressure and fixing them so as to keep their distances constant and inserting them into a container. CONSTITUTION:Plastic plates measuring 15cm in width, 25cm in height, and 1cm in thickness are placed on both sides in contact with anode plates of a plate group and bound them with two plastic bands with the pressure of 30kg/dm<2> applied to them so that the pressure applied to the plate group including plastic plates does not change. The plate group is inserted into a container and dilute sulfuric acid is poured into the container as electrolyte. The battery is sealed with rubber vent plug so as to open only when the inner pressure exceeds about 0.1 atmosphere. The plate group is easily inserted into the container with high pressure applied to it.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to lead-acid batteries, and more particularly to a method for manufacturing lead-acid batteries using a group of plates under high pressure.

Conventional Structure and Problems Lead-acid batteries using paste-type electrode plates are constructed by stacking anode plates and cathode plates alternately with separators in between and assembling them into a battery case. In this case, the electrode plate is assembled into the battery case with a pressure above a certain level, for example, 10 KI/dm2 or above, applied to the entire electrode group, and this pressure is maintained at a high range (ioOKI/, dm2). It was known that the higher the degree of pressurization, the more the discharge performance and life of the storage battery will be improved1. However, even if the pressure applied to the electrode plate group is 10ν/d! Even if it is set to n2, as the size of the electrode plate becomes larger, that is, as the size of the internal Ω storage battery increases, the total pressure applied to pressurize the electrode plate group needs to be proportional to the electrode plate area. Due to the extremely large force involved, it becomes physically difficult to assemble the electrode plate into the battery case.

Of course, as the pressure applied to the electrode plates increases, the total pressure increases in direct proportion to that pressure, making it difficult to assemble the electrode plates into the battery case.

, Object of the Invention , , - The present invention provides a method for easily assembling an electrode group into a battery case in a state where a high group pressure is applied to an extremely hot group, especially a relatively large electrode group. This is what we propose.

Structure of the Invention In order to achieve the above object, the present invention provides sufficient strength by press-welding plastic plates to both end faces parallel to the electrode plates of a group of electrode plates at a pressure of 20 Kf/dm2 or more when assembling a lead-acid battery. The plastic plates are fixed at a constant distance using a belt, and then the other electrode plates are assembled into the battery case. In addition, the dimensions of the plastic plate here are:
It is desirable that the size is slightly larger than the size of the electrode plate. This is to apply pressure as uniformly as possible to the electrode plate. By adopting such a configuration, it is possible to easily assemble the electrode plate group having a high group pressure into the battery case, and it is also possible to maintain the pressure of the electrode plate group at a high level even after being assembled.

DESCRIPTION OF EMBODIMENTS A case where the present invention is applied to a cathode absorption type sealed lead acid battery will be described. 16 paste-type anode plates (width: 14 false, height = 22 false, thickness: 4 square) and paste-type cathode plates (
Width: 14ca1 Height: 22cm Thickness: 2.5+m)
17 sheets of mat-like separators made mainly of fine glass fibers are stacked alternately with intervening mat separators interposed between them to form an electrode plate group, and a width: 15 cm is formed on both end surfaces of this electrode plate group in contact with the cathode plate.
m, height = 26 mm, thickness: 1 cI&, is pressed against the plastic plate and a pressure of 30~/dfn2 is applied, and two plastic bands are used to add it to the electrode plate group including this plastic plate. Tie the rabbit tightly so that the pressure does not change. Next, this electrode plate group is inserted into a battery container, and a limited amount of dilute sulfuric acid is injected as an electrolyte under the actually flowing plate. The storage battery is sealed with a rubber check valve so that it is released only when the internal pressure of the storage battery is approximately 0.1 atm or higher. This storage battery is referred to as storage battery A of the example.

□ Next, as a conventional storage battery B, an attempt was made to configure a storage battery with the same conditions as storage battery A, except that the electrode plate group was not bound by the plastic band in the storage battery A of the example. The group was so thick that it was almost impossible to insert it into the battery case. Here, it has been found that if an attempt is made to forcefully insert the electrode plate group into the battery case, the electrode plates located at the ends of the electrode plate group will be particularly severely damaged.

Here, it is important that the width and height of the plastic plate that presses the electrode plate group are both equal to or greater than the width and height of the electrode plate, and preferably a separator sandwiched between the electrode plates. The size should be greater than or equal to . This is important to avoid damaging the peripheral parts of the electrode plates and separators.

Storage batteries A and B are charged at 2.5V/in a water tank at 40°C.
The figure shows the relationship between the number of discharges and the discharge capacity when a test was conducted in which the cell was subjected to a constant voltage and a constant current of 80 A (continuous discharge up to 1.75 V/cell). As is clear from the figure, the discharge capacity of storage battery A hardly decreases as the number of discharges increases, but when compared to storage battery λ, the decrease in discharge capacity of storage battery B as the number of discharges increases is remarkable. . This means that in battery A, the electrode group is not damaged when it is inserted into the battery case, and there is almost no decrease in the pressing force on the electrode group due to swelling of the battery case during charging and discharging. It is thought that this is because of this.

Effects of the Invention As described above, the present invention makes it possible to easily incorporate a group of electrode plates into a battery case while applying high pressure to the electrode plates, and also to minimize the decrease in discharge capacity due to repeated charging and discharging. It provides a superior lead-acid battery.

[Brief explanation of drawings]

The figure shows a storage battery A according to an embodiment of the present invention and a storage battery B according to a conventional example.
It is a discharge characteristic diagram with.

Claims (1)

[Claims] ′(1゛) Plastic plates are pressed against both end faces parallel to the electrode plates of the electrode plate group with a pressure of 201j/dm or more, and the distance between the plastic plates is limited with a band having sufficient strength. A method for producing a lead-acid battery, which is characterized by fixing the electrode plates at a certain distance to prevent deterioration, and then incorporating the electrode plates into a battery case. (2) The method for manufacturing a lead-acid battery according to claim 1, wherein the size of the plastic plate is equal to or larger than the size of the electrode plate.