JP2003234123A - Sealed type lead acid storage battery and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a life-time of the sealed type storage battery produced by draining a surplus electrolytic solution after a chemical conversion treatment is carried out in the sealed type storage battery by using a large amount of the electrolytic solution, and provide a manufacturing method of a sealed type lead acid storage battery wherein its manufacturing method is made simple and easy. <P>SOLUTION: If the storage battery after the chemical conversion treatment of the sealed type lead acid storage battery is made stood upside-down and the surplus electrolytic solution is drained, because the erection upside-down is made to be in an inclined erection upside-down state and a concave part is formed in the inner face of a lid, one part of the surplus electrolytic solution is made to be remained in the storage battery in the erected state so that this is return-flowed into the battery case. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a sealed lead-acid battery and a method for manufacturing the same.

[0002]

2. Description of the Related Art In a sealed lead-acid battery, a group of electrode plates in which positive and negative electrode plates are alternately laminated via a separator is housed in a battery case, and the end of a hollow exhaust pipe is closed by a rubber valve. The lid is equipped with a safety valve, and an electrolytic solution is injected into the battery case to the extent that the electrode plate group can be impregnated. This seed battery is designed so that the capacity of the negative electrode is increased so that only oxygen gas is generated by charging and discharging during use, and only oxygen gas is generated from the positive electrode. Then, the oxygen gas generated from the positive electrode reacts with the negative electrode and is reduced and absorbed. Therefore, the internal pressure of the storage battery does not rise due to the generated gas, and it is possible to hermetically seal it. Then, in consideration of the situation where this oxygen gas cannot completely react with the negative electrode, the generated gas is exhausted to the outside from the safety valve.

In the manufacture of such a sealed lead-acid battery, after covering the battery case, an electrolytic solution made of dilute sulfuric acid is poured into the battery case from a hollow exhaust pipe, and charging and discharging are repeated. The electrode plate is then subjected to a chemical conversion treatment to activate the electrode plate, but at this time, in order to increase the conversion efficiency, only a small amount of electrolytic solution that can be impregnated into the electrode plate is injected. Instead of pouring liquid, inject a large amount of electrolytic solution so that a large amount of excess liquid exists in the battery case, invert the storage battery at the end of formation and drain the excess electrolytic solution to the outside of the storage battery. In some cases, the upper part of the hollow exhaust pipe is closed with a rubber valve to be hermetically sealed.

[0004]

Depletion of the electrolyte is known as one of the causes of the service life of these sealed lead-acid batteries. However, in the storage battery manufactured by the above method, the gas generated during chemical conversion is extremely high. There is a problem in that the electrolyte stays in the plate group and a predetermined amount of the electrolyte cannot be left in the battery case, the electrolyte is depleted relatively quickly, and the life of the storage battery is relatively short.

[0005]

[Means for Solving the Problem] As a method for solving this problem, it is possible to invert the storage battery that has been subjected to the chemical conversion treatment, drain the electrolytic solution, and then return it to the upright state to add the electrolytic solution. Liquid work is required twice, which is troublesome.

[0006] Therefore, even if the storage battery is inverted and the electrolytic solution is drained, the storage battery is inverted by forming a recess for storing the electrolytic solution in the lid so that a predetermined amount of liquid remains in the storage battery. Also, when a part of the drained electrolytic solution is left in the recess or the like and the storage battery is erected, the remaining electrolytic solution is refluxed into the battery case.

[0007]

As a result, when the storage battery is returned to the upright state, the electrolytic solution remaining in the concave portion of the lid is returned to the inside of the battery case to be impregnated into the electrode plate group, and the electrode plate group is impregnated with a sufficient amount of electrolytic solution. You can

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, when the electrode plate of a sealed lead acid battery is housed in a battery case to form a battery case, electrolysis is performed by simply impregnating the electrode plate group originally required by the sealed lead acid battery. After injecting a large amount of electrolyte more than the liquid volume once and draining the excess electrolyte other than the electrolyte impregnated in the electrode plate group after the chemical conversion treatment, leave some electrolyte in the battery. The manufacturing method is to drain the liquid, and in order to easily carry out this method, a recess is formed on the back surface of the lid to secure the amount of the electrolytic solution to be left. Examples will be described in detail below.

[0009]

[Embodiment 1] FIG. 1 is a perspective view of a sealed lead-acid battery according to a first embodiment of the present invention. 1 is a battery case made of a synthetic resin, the inside of which is divided into 6 cell chambers by partition walls, and the positive and negative electrode plates in which positive and negative active material pastes are filled and applied to a lattice substrate made of lead-calcium lead alloy in each cell chamber. The separator mat is made of a non-woven fabric of glass fiber and has excellent liquid retention, and the electrode plates that are stacked alternately are stored through the separator, and the electrode plates stored in each cell chamber are connected in series with each other. Has been done.

A lid 2 made of synthetic resin covers the upper opening of the battery case 1 in which the electrode plate group is housed. Reference numeral 3 denotes a synthetic resin covering lid provided on the upper surface of the lid, which is formed into a plate shape. 4 is an exhaust hole formed in the cover, and 5 is a positive and negative electrode terminal of the storage battery.

FIG. 2 is a partial cross-sectional view showing an inverted state of the sealed lead-acid battery after finishing the chemical conversion treatment.

In this sealed lead-acid battery, an electrode plate group (not shown) is housed in a battery case 1 formed as described above, the electrode plate groups in each cell chamber are connected in series, and then the lid 2 is heat-melted. It is applied to the upper opening of the battery case 1 by sealing to seal the battery case 1. The cell chambers partitioned and formed in the battery case 1 are separated by the lid 2 and are independent chambers. The lid 2 is formed in a rectangular shape as a whole by providing an outer peripheral wall 7 on the outer periphery of a flat rectangular flat plate 6 so as to project vertically, and one exhaust pipe 8 projects corresponding to each cell chamber. Is formed.
This exhaust stack consists of a hollow cylindrical body that opens up and down, and
Constitutes the opening.

Then, the storage battery is placed in an upright state and the exhaust stack 8
From the above, a large amount of electrolytic solution is injected into the storage battery, a chemical conversion device for charging and discharging the positive and negative electrode terminals 5 is connected, and the storage battery is charged and discharged for chemical conversion treatment.

When the formation is completed, the storage battery is inverted. At this time, what is shown in FIG. 2 is one in which the upper end one side of the lid 2 and the tip of the terminal 5 are placed on the floor surface 9 and the storage battery is turned upside down. As a result, the excess electrolytic solution in the storage battery flows out from the exhaust pipe 8 that opens as shown by the arrow, but the storage battery placed on the floor is inclined, so that one side of the lid and the exhaust pipe 8 are inclined. Open end 1 that opens into the battery case 1
Between 0 and 0, the excess electrolytic solution 11 can be left without being drained. In this state, if the excess electrolytic solution stops flowing from the exhaust tube 8, the electrolytic solution remaining in one corner of the storage battery will not leak out so that the storage battery is inclined in the example shown in FIG. Then, the lid was lifted upright so that the remaining electrolytic solution 11 was refluxed into the battery case 1.

After the storage battery is erected, the cap-shaped rubber valve 1 is attached to the tip of the exhaust pipe 8 as shown by the dotted line in FIG.
2 is capped and hermetically sealed, and a flat plate-shaped cover lid 3 positioned above the lid 2 is attached to the step portion 13 at the tip of the outer peripheral wall 7 of the lid 2 to manufacture the sealed lead acid battery shown in FIG.

Reference numeral 14 denotes a safety valve chamber formed by attaching the cover lid 3 to the lid 2, and the gas discharged from the battery case by pushing the rubber valve 12 away is provided in the cover lid 3 through the safety valve chamber 14. 4 is discharged to the outside. In this case, an explosion-proof filter or the like may be provided below the exhaust hole 4.

The amount of the electrolytic solution to be left can be arbitrarily determined by adjusting the position of the exhaust tube, the height of protrusion into the battery case, and the tilt angle when inverted.

[0018]

[Embodiment 2] FIG. 3 shows a partial sectional view of another embodiment. Although the basic configuration of the battery case 1 and the lid 2 is almost the same as that of the first embodiment,
In this embodiment, when the storage battery is inverted on the flat plate 6 of the lid 2, that is, when the lid 2 is turned upside down, the exhaust pipe 8 which is an opening portion.
Electrolyte-retaining recess 1 having a bottom at a position lower than the upper end of
5 is formed corresponding to each cell chamber. The recess 15 is formed by recessing a part of the flat plate 6 when the lid 2 is molded.

In this embodiment, the terminal 5 is formed in the notch 16 formed in the corner of the lid 2 so that the upper end of the terminal 5 is covered by the lid 2.
So that it does not protrude from the upper surface of.

In the case of this embodiment, after the chemical conversion treatment, the storage battery is completely inverted so that the surplus electrolytic solution is drained from the exhaust tube 8 even if the storage battery is partially inverted by the recess 15 for remaining electrolytic solution. The electrolytic solution 11 of remains. When the storage battery was erected, it was erected so that the remaining electrolytic solution did not leak out, and the remaining electrolytic solution 11 was refluxed into the battery case 1.

Thereafter, as in the first embodiment, a cap-shaped rubber valve 12 is attached to the tip of the exhaust pipe, and the cover 4 can be attached to the stepped portion 13 of the outer peripheral wall of the lid 2 to manufacture.

The amount of the electrolytic solution to be left can be arbitrarily determined depending on the volume of the concave portion formed on the back surface of the lid.

Further, the recess may be formed between the exhaust tube and the outer peripheral wall of the lid, and the storage battery may be tilted to allow the electrolytic solution to remain when the battery is inverted as in the first embodiment.

[0024]

As described above, according to the present invention, the excess electrolytic solution is not completely drained after the chemical conversion treatment but a part of the electrolytic solution is allowed to remain and is refluxed in the battery case. It is possible to prevent the decrease of the amount of electrolyte to be impregnated and improve the life, and when the recess is formed on the back surface of the lid, it can be easily carried out without tilting the storage battery, and its configuration is also simple and easy. The effect is that it can be implemented.

[Brief description of drawings]

FIG. 1 is a perspective view of a sealed lead acid battery.

FIG. 2 is a partial cross-sectional view showing a state where the storage battery of the first embodiment is inverted.

FIG. 3 is a partial cross-sectional view showing a state when a storage battery of another embodiment is inverted.

[Explanation of symbols]

1 ... battery case 2 ... Lid 8 ... Exhaust stack (opening) 11 ... remaining electrolyte 15 ... Recess for retaining electrolyte

Claims (3)

[Claims] 1. A method for manufacturing a sealed lead-acid battery comprising a battery case containing an electrode plate group and a lid, wherein the lid has an opening,
After applying a lid to the battery case containing the electrode plate group, injecting an electrolytic solution from the lid opening, and subjecting the storage battery to chemical conversion treatment, the storage battery is inverted and excess electrolysis is performed from the opening of the lid. When the liquid is drained, the excess electrolytic solution is allowed to partially remain in the lid, and then the storage battery is erected so that the remaining electrolytic solution is refluxed into the battery case and the opening portion of the lid is opened. A method for manufacturing a sealed storage battery, characterized in that the battery is sealed. 2. The lid has an opening and, on the back surface thereof, an electrolytic solution residual recess having a bottom at a position lower than the upper end of the opening when the lid is turned upside down, and the electrode plate group is accommodated therein. After applying the lid to the battery case, injecting the electrolytic solution from the opening of the lid, performing the chemical conversion treatment on the storage battery, and then inverting the storage battery to drain the excess electrolytic solution from the opening of the lid. , A part of the electrolytic solution is allowed to remain in the recess formed on the back surface of the lid, and then the storage battery is erected so that the remaining electrolytic solution is circulated into the battery case and the opening of the lid is closed. The method for manufacturing a sealed storage battery according to claim 1, wherein the sealed storage battery is sealed. 3. An electrolytic cell comprising a battery case containing a group of electrode plates and a lid, the lid having an opening and a bottom portion on a back surface thereof at a position lower than an upper end of the opening when the lid is turned upside down. A sealed lead-acid battery having a recess for retaining liquid.