JPH11339748A - Lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lead-acid battery having a splash-proof plate preventing both breakage of separators in the time of injection of an electrolyte, and short- circuits of positive electrode plates with negative electrode straps, without preventing emission of oxygen gas generated in the electrode group out of the battery. SOLUTION: In this lead-acid battery, an electrode group constituted by piling positive electrode plates 1 and negative electrode plates 2 with separators 3 intervening between them and by coupling homopolar electrode plate lug parts 1a, 2a together by straps 4, 5 is contained in a battery jar 6, and a splash- proof plate 7 is set in the upper space of the electrode group, then a lid 8 having a liquid inlet 9 is mounted on the upper surface of the battery jar 6. Here, the splash-proof plate 7 is composed of a splash-proof part 7b, projections 7a extending from one side of the splash-proof part 7b, and a projection 7d extending from the opposite side of the splash-proof part 7b which is put just below the liquid inlet 9 and separated from the positive electrode plates 1. The projections 7a of the one side are inserted between the lug parts 2a, 2a of the negative electrode plates 2, and the projection 7d of the opposite side 7c is contacted with a part of the electrode group or the battery jar 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-acid battery in which a splash plate is disposed in a space above a pole group.

[0002]

2. Description of the Related Art Normally, a lead-acid battery is laminated with a separator 3 interposed between a positive electrode plate 1 and a negative electrode plate 2 as shown in FIG. The pole group is connected by 4 or 5 to form a pole group, and the pole group is housed in the battery case 6. In such a lead-acid battery, since the lower surface of the connection rod or the strap 4 or 5 is close to the upper side of the polar plate having a different polarity, the lead-acid battery may be displaced or vibrated at the time of manufacture, or may be stretched due to long-term use of the lead-acid battery. The connection rod or strap and the electrode plate were sometimes short-circuited. Further, in such a battery, after the electrode group is housed in the battery case 6, a lid 8 having a liquid inlet 9 is attached, and the electrolytic solution is injected from the liquid inlet 9. Since it takes a long time for the electrolyte solution to penetrate into the battery naturally, a method of injecting the battery under reduced pressure is usually employed. In this case, when the electrolyte solution is started to be injected, the electrolyte solution may flow vigorously into the battery, and the separator 3 may be damaged.

In order to prevent such a short circuit and breakage of the separator, a splash-proof plate 7 as shown in FIG. 5 has been conventionally used. The splash-proof plate 7 is a thin plate made of resin or the like, and has a comb-shaped projection 7a on one side. The projection 7a is inserted between the ears 2a and 2a of the negative electrode plate 2 to prevent the short circuit described above. At the same time, the rectangular splash-proof portion 7b was located immediately below the liquid inlet 9 of the lid 8 to protect the separator 3 from flowing down of the electrolytic solution.

In addition, the projection 7a of the splash-proof plate 7 comes off the negative electrode plate ear 2a due to the vibration of the battery, and the short-circuit prevention of the positive electrode plate 1 and the negative electrode strap 5 cannot be achieved. Was in contact with the positive plate lug 1a.

[0005] In the case of a lead-acid battery, the short-circuit between the electrode plate and the strap is usually caused by elongation of the positive electrode plate 1 in most cases, and therefore the upper edge of the positive electrode plate 1 and the strap 5 on the negative electrode side are connected as shown in FIG. It is sufficient to insert the projection 7a of the splash-proof plate 7 only between them. As described above, the splash-proof plate 7 having the protrusions 7a on only one side makes it very easy to insert the electrode plate between the ears as compared with the splash-proof plate having the comb-like protrusions on both sides. In addition, 10 is a positive electrode terminal and 11 is a negative electrode terminal.

[0006]

The splash plate 7 described in the prior art covers substantially the entire upper surface of the electrode group, and oxygen gas generated at the end of charging flows from the separator 3 to the upper space of the electrode group. There was a problem that hindered movement. In order to solve such a problem, a splash-proof plate having a through-hole small enough not to damage the separator 3 at the time of injecting the electrolyte is provided in the splash-proof portion 7b of FIG. Was not so large, and no remarkable effect was obtained.

Therefore, the present invention does not prevent the oxygen gas generated in the electrode group from being exhausted to the outside of the battery, and furthermore, it is possible to prevent the breakage of the separator and the short circuit between the positive electrode plate and the negative electrode strap without fail. It is an object of the present invention to provide a lead storage battery provided with a splat.

[0008]

In order to solve the above-mentioned problems, the present invention is to provide a separator between a positive electrode plate and a negative electrode plate.
Are stacked, and the pole group in which the same-polarity pole ears 1a and 2a are connected to each other by the straps 4 and 5 is housed in the battery case 6, and the splashproof plate 7 is arranged in the upper space of the pole group. In a lead-acid battery in which a lid 8 having a liquid inlet 9 is attached to the upper surface of the battery case 6, the splash-proof plate 7 includes a splash-proof portion 7b, a protrusion 7a extending from one side of the splash-proof portion, Opposite side 7c of splash-proof part
And the projections 7d extending from the negative electrode plate 2 are located immediately below the liquid injection port 9 and separated from the ears 1a of the positive electrode plate 1. The protrusion 7d is inserted between the ears 2a and 2a and is on the opposite side 7c.
Is in contact with the electrode group or a part of the battery case 6.

It is preferable that the splash-proof portion 7b has a size such that the separator 3 is not damaged at the time of injecting the electrolytic solution, or has a large number of through holes located at positions where the separator 3 is not damaged.

[0010]

In the splash-proof plate 7 according to the present invention, the splash-proof portion 7b is separated from the positive plate ear 1a and has a gap between the opposite side 7c and the ear 1a. Oxygen gas can escape to the upper space of the pole group. In addition, splashproof part 7
Since “b” is located immediately below the liquid inlet 9, damage to the separator 3 can be prevented. Furthermore, since the projection 7a of one side is inserted into the ear 2a of the negative electrode plate and the projection 7d of the opposite side 7c is in contact with a part of the electrode group or the battery case 6, the splash prevention plate 7 has the ear 1 of the bipolar plate.
Since the battery is fixed at the positions a and 2a, even if the battery vibrates, the battery hardly displaces and does not fall out from between the lugs 2a and 2a of the negative electrode plate.

When a large number of through-holes 7e are formed in the splashproof portion 7b, the oxygen gas can be moved to the upper space of the electrode group through the through-holes.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention.
FIG. 2 is a plan view showing an embodiment of a splash-proof plate according to the present invention, and the same reference numerals as those in FIGS. 4 and 5 denote the same names.

In the figure, a positive electrode plate 1 and a negative electrode plate 2 are paste electrode plates for a lead-acid battery, respectively.
A pole group consisting of four sheets, four negative plates, and six separators is formed and housed in the battery case 6. The ear portions 1a of the three positive electrode plates 1 are connected to each other by a lead alloy strap 4, and the ear portions 2a of the four negative electrode plates 2 are connected to each other by a lead alloy strap 5.
Are connected by From each of the straps 4 and 5, a pole is erected and penetrates the lid 8 to form a positive terminal 10 and a negative terminal 11. The lid 8 is attached so as to cover an upper opening surface of the battery case 6, and a liquid inlet 9 for injecting an electrolyte is formed substantially at the center.

The splash-proof plate 7 according to the present invention is made of resin,
For example, as shown in FIG. 2, a rectangular splashproof portion 7b, three projections 7a extending from one side of the splashproof portion, and one projection extending from the opposite side 7c opposite to one side of the splashproof portion 7
d.

In such a splash-proof plate 7, a part of the splash-proof portion 7b is located immediately below the liquid inlet, and a number of small through holes 7e are formed in the splash-proof portion 7b except for this portion, and the opposite side 7c is formed. Positive electrode plate 1
Is located away from the ear 1a, and the opposite side 7c and the ear 1a
There is a gap between the pole group and the upper space.
Also, three projections 7a are inserted between the four rows of negative electrode tabs 2a below the negative electrode strap 5, and the roots of the projections 7a are in contact with the side surfaces of the negative electrode tabs 2a. Further, the tip of the projection 7d on the opposite side 7c is in contact with the side surface of the positive electrode plate lug 1a.

Since the upper surface of the electrode group between the opposite side 7c excluding the protrusion 7d and the positive electrode lug 1a is not covered with the splash-proof plate 7, oxygen gas generated in the electrode group from above is removed upward. The gas can escape to the space, and the gas can also escape to the upper space from the through hole 7e of the splashproof portion 7b. In addition, since the splashproof portion 7b is located immediately below the liquid inlet 9, even if the electrolyte flows vigorously from the liquid inlet 9, the separator 3 is not damaged. Further, since both sides of the splash-proof plate 7 are in contact with the polar plate ears of different polarities and are fixed in the upper space of the separator 3, the projections 7a of the splash-proof plate 7 even if the electrode group vibrates. Does not fall out from between the negative electrode plate ears 2a.

[0018]

Next, an embodiment of the present invention will be described.

First, a positive electrode plate 1 and a negative electrode plate 2 for a lead storage battery manufactured according to a conventional method were laminated with a separator 3 interposed therebetween to obtain three electrode groups of three positive electrode plates and four negative electrode plates. Here, the interval between the positive electrode lugs 1a is 4.0 mm, the interval between the lugs of both electrode plates is 20 mm, and the distance between the upper side of the positive electrode plate 1 and the lower surface of the negative electrode strap 5 is 4 mm. After inserting the splash-proof plate 7 shown in FIGS. 2 and 5 into this electrode group, the electrode group was inserted into the battery case 6, and the lid 8 having the liquid inlet 9 was attached to obtain an uninjected battery. The battery in which the splash-proof plate 7 of the present invention is inserted is the battery A of the present invention, the battery in which the conventional splash-proof plate 7 of FIG. 5 is inserted is the conventional battery B, and the comparative battery C in which the splash-proof plate is not inserted is shown in FIG. Was also prepared at the same time. A predetermined electrolytic solution was injected into these batteries to produce a sealed lead-acid battery having a capacity of 5 Ah.

After charging and discharging these batteries and confirming the initial capacity, a vibration test was conducted in which 5 G in the horizontal direction was applied for 24 hours. Thereafter, floating charging was performed at 65 ° C. at a voltage of 2.275 V per cell. Table 1 shows a comparison of the periods until these batteries are short-circuited.

[0021]

[Table 1]

When the battery after the short circuit was disassembled and examined,
In each case, it was confirmed that the height of the positive electrode plate 1 was elongated and short-circuited with the lower surface of the negative electrode strap 5. However, in the battery A of the present invention and the battery B of the related art, although the positive electrode plate 1 was extended, it was confirmed that the short circuit was prevented by the splash-proof plate 7.

Next, the battery A of the present invention and the battery B of the related art are each 1 A
(Ampere) for 4 hours and charge at 0.25 A for 17 hours.
The C capacity was examined. As shown in FIG. 3, the battery A of the present invention
Less decrease in capacity than conventional batteries. Disassembly and inspection after 150 cycles revealed that a large amount of lead sulfate had accumulated in the negative electrode of the conventional battery B. Thus, the conventional battery B
It is considered that the charging efficiency of the negative electrode was lower. Since the battery temperature of the battery A of the present invention is lower during the charge / discharge cycle of the battery A of the present invention, the oxygen gas generated at the end of the charge easily moves to the upper space due to the small area of the splash-proof plate 7 and the charge by gas absorption. It is estimated that the decrease in efficiency was suppressed.

In this embodiment, the projection 7d on the opposite side of the splash-proof plate 7 is provided.
Is curved so that the tip of the projection 7d abuts against the side surface of the positive electrode plate lug 1a, but is not limited to this method. Also, the projection 7d is not brought into contact with the side surface of the positive electrode plate ear 1a,
It may pass through between the lugs 1 a of the positive electrode plate and reach the side wall of the battery case 6. Further, the protrusion 7d may be bent to abut on the positive electrode strap 4, and is not limited to the present embodiment.

[0025]

As described above, according to the first aspect of the present invention, since a gap is formed between the splash-proof portion and the ear portion of the positive electrode plate, the gap is generated in the electrode group from the gap. Oxygen gas can be easily moved to the upper space, and a lead storage battery with excellent life performance can be provided. Further, since the splash-proof portion is disposed immediately below the liquid inlet, the separator is not damaged when the electrolyte is injected. Further, since the both ends of the splash-proof plate are fixed by the electrode plate or the like, the splash-proof plate does not come off the ear of the negative electrode plate due to vibration, and the positive electrode plate and the negative electrode strap are not short-circuited.

According to the second aspect, in addition to the effect of the first aspect, a lead-acid battery having excellent life performance, in which more oxygen gas generated in the electrode group can be released to the upper space of the electrode group. Can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of a splash-proof plate according to the present invention.

FIG. 3 is a graph showing cycle life characteristics of a battery A of the present invention and a conventional battery B.

FIG. 4 is a sectional view showing an embodiment of a conventional battery using a splash-proof plate.

FIG. 5 is a plan view showing an embodiment of a conventional splash-proof plate.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 positive electrode plate 1a positive electrode plate ears 2 negative electrode plate 2a negative electrode plate ears 3 separator 5 negative electrode strap 6 battery case 7 splash-proof plate 7a protrusion on one side of splash-proof plate 7b splash-proof portion 7c opposite side of splash-proof plate 7d Projection on the other side of the splash plate 7e Through hole of the splash-proof plate 8 Lid 9 Liquid inlet

Claims (2)

[Claims] An electrode group in which a separator is interposed between a positive electrode plate and a negative electrode plate and electrode ears of the same polarity are connected to each other by a strap is housed in a battery case. In a lead-acid battery in which a plate is disposed and a lid having a liquid inlet is attached to the upper surface of the battery case, the splash-proof plate includes a splash-proof portion, a protrusion extending from one side of the splash-proof portion, and the splash-proof portion. A projection extending from the opposite side of the negative electrode plate, wherein the splash-proof portion is located immediately below the liquid inlet and is separated from the ear portion of the positive electrode plate, and the projection on one side is formed of the ear portion of the negative electrode plate. Wherein the projection on the opposite side is in contact with a part of the electrode group or the battery case. 2. A lead-acid battery according to claim 1, wherein a number of through holes are formed in the splash-proof portion.