JPH1140137A - Lid structure for lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid structure of a lead-acid battery, capable of preventing electrolytic splashes from directly penetrating from a slit between wells to a liquid plug and improving vibration-proof liquid leakage property. SOLUTION: A liquid month part 3 is provided at a lid main body 2 of a lead-acid battery. A plurality of wells 6 are protruded along a peripheral direction around the liquid month part 3 on a lower level of the lid main body 2 with a slit 7 existing adjacently and mutually. At a position lying outside these wells 6, the slits 6 are covered corresponding to each slit 7, and a plurality of outside wells 21 respectively protrude on a lower face of the lid main body 2 in width dimensions encompassing at the end of each well 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid structure for a lead-acid battery, in which a plurality of wells project from a lower surface of a lid body around a liquid port along a circumferential direction.

[0002]

2. Description of the Related Art Conventionally, a lid structure of a lead-acid battery is shown in FIGS.
As shown in the figure, a top plate 2a covering each cell chamber (not shown) of the battery case 1 and a droop around the top plate 2a are provided integrally and fitted around the battery case 1. And a lid main body 2 having a fitting edge portion 2b. A liquid port portion 3 is provided on the top plate portion 2a of the lid main body 2 corresponding to each cell chamber of the battery case 1, and a partition wall of each cell chamber is provided. A partition wall 4 is provided so as to correspond to (not shown). In addition, positive and negative terminals 5a and 5b are provided in a liquid-tight manner on the top plate 2a corresponding to the cell chambers at both ends of each cell chamber provided in a line. Lid body 2
A plurality of wells 6 are provided along the circumferential direction on the lower surface of the top plate portion 2a around each liquid port portion 3 with slits 7 provided between adjacent ones. Top plate 2a forming liquid port 3
A female screw portion 9 is provided on the inner periphery of the cylindrical portion 8 (FIG. 6).

[0003] The liquid port portion 3 having such a structure is provided with a structure shown in FIG.
A liquid port plug 10 having a structure shown in (A) to (C) is inserted and screwed. The liquid port stopper 10 is mainly composed of a tubular stopper body 11, a splash-proof means 12 and an explosion-proof filter 13 incorporated in a lower part and an upper part in the tubular stopper body 11. The tubular plug body 11 includes a tubular body 11b having a gas passage 11a formed therein, a top plate 11c closing the upper end of the tubular body 11b, and a bottom plate closing the lower end of the tubular body 11b. And a portion 11d. Cylindrical body 11b
The lower part is formed of a splash-proof cylindrical part 11ba having a small outer diameter,
The upper part is constituted by a stopper cylinder 11bb having a large outer diameter. A plurality of openings 14 are provided in the splash-proof tube portion 11ba, and the top plate portion 11 closing the upper end of the stopper tube portion 11bb is provided.
Two exhaust ports 15 are provided in c. Stopper tube 1
On the outer periphery of the lower part of 1bb, there is provided a male screw portion 16 for screwing the liquid port plug 10 into the female screw portion 9 in the liquid port portion 3 of the storage battery. A concave portion 17 is provided on the outer periphery of the plug cylinder portion 11bb on the male screw portion 16, and a packing 18 is fitted and supported in the concave portion 17.

[0004] The splash-proof means 12 is mainly composed of a splash-proof cylindrical portion 11b.
In the gas passage 11a on the a side, a plurality of splash-prevention plates 19 are provided, which are staggered downward and displaced vertically from the inner surface of the splash-proof tube portion 11ba.

The explosion-proof filter 13 is provided across the gas passage 11a in a stopper cylinder 11bb close to the top plate 11c.

In FIG. 6, reference numeral 20a denotes a liquid level of the electrolytic solution 20 in the battery case 1, and in this case, it reaches the downward end of the well 6.

[0007]

However, in the conventional lead-acid battery lid structure as described above, when the lead-acid battery is subjected to vibration, the electrolyte is directly sprayed from the slits 7 provided between the wells 6. There is a problem that the liquid droplets may fall on the cylindrical portion 11ba, and the possibility of overflow of the electrolyte droplets via a route as shown by an arrow in FIG. 9C increases. In this case, an explosion-proof filter 13 is provided in the gas passage 11a, and the explosion-proof filter 13 is subjected to a water-repellent treatment.
As a result, the electrolyte repellent effect is lost, and as a result, when the electrolyte droplets adhere to the lower surface of the explosion-proof filter 13, they are sucked up into the filter by capillary action, and accumulate at the upper portion of the explosion-proof filter 13, causing the electrolyte to pass through the filter. Clogging occurs, and these electrolytes eventually scatter and leak to the outside through the exhaust port 15 due to gas or the like generated by overcharging.

An object of the present invention is to provide a lid structure of a lead-acid battery in which electrolyte droplets are prevented from directly intruding from a slit between wells into a liquid port plug and have improved resistance to vibration overflow. .

[0009]

SUMMARY OF THE INVENTION According to the present invention, there is provided a lead-acid battery in which a liquid port is provided on a lid body, and a plurality of wells are formed along the circumferential direction around the liquid port on the lower surface of the lid body. The present invention is to improve the lid structure of a lead-acid battery, which is provided with a slit in the lead-acid battery.

In the present invention, at a position outside each well,
A plurality of outer wells projecting from the lower surface of the lid main body are formed in a width dimension covering the slits and straddling the ends of the wells on both sides corresponding to the slits.

The gap between the inner well and the outer well is preferably in the range of 1 to 6 mm.

In this manner, at a position outside the inner wells, the slits are covered corresponding to the slits between the adjacent wells and have a width dimension spanning the ends of the inner wells on both sides. When a plurality of outer wells project from the lower surface of the lid body, the electrolyte splash generated by vibration of the battery case or the like first hits the outer wells and falls. Electrolyte droplets that do not hit the outer wells but pass through openings between adjacent outer wells hit the inner wells and fall. When such a phenomenon occurs, it is possible to prevent the electrolyte droplets from entering the liquid port plug from the slit of the inner well, and it is possible to improve the overflow performance of the lead storage battery.

[0013]

1 to 4 show an embodiment of a lid structure of a lead storage battery according to the present invention. Parts corresponding to those in FIGS. 5 to 8 are denoted by the same reference numerals.

In the lid structure of this lead-acid battery, a width dimension covering the slits 7 at positions outside the two wells 6 corresponding to the slits 7 and straddling the ends of the wells 6 on both sides is 2 mm. Top well 2 of the lid body 2
The projections are respectively provided on the lower surface in FIG. The protrusion length of each outer well 21 is provided substantially equal to the protrusion length of each inner well 6. In this case, a gap d between the inner well 6 and the outer well 21 at a position where they face each other.
Is preferably set in the range of 1 to 6 mm.

The liquid port plug 10 having the structure shown in FIGS. 9A to 9C is inserted and screwed into the liquid port 3 of the lid body 2 in such a lid structure of a lead storage battery. I have. In this case, the position of the bottom plate portion 11d of the liquid port plug 10 is determined so as to be located above the lower ends of the wells 6 and 21.

As described above, at positions outside the inner wells 6, these slits 7 are covered corresponding to the slits 7 between the adjacent wells 6, and the ends of the inner wells 6 on both sides are provided at the ends. When two outer wells 21 each having a width of the straddling project from the lower surface of the lid body 2, the droplets of the electrolytic solution 20 generated by the vibration of the battery case 1 and the like are first exposed to the outer wells 21.
And fall. The droplets of the electrolytic solution 20 that have not passed through the outer well 21 and passed through the openings 22 between the adjacent outer wells 21 hit the inner well 6 and fall. When such a phenomenon occurs, it is possible to suppress the splash of the electrolytic solution 20 from entering the liquid port plug 10 from the slit 7 of the inner well 6 and improve the overflow performance of the lead storage battery.

[0017]

An embodiment of the present invention will be described.

The following evaluation experiments were performed using a lead storage battery having the lid structure of the lead storage battery shown in FIGS. 1 to 6 and the liquid port plug 10 shown in FIGS. 9A to 9C.

(1) Evaluation battery: 80D26R (2) Test conditions (a) Excitation for 2 hours in the vertical direction at an acceleration of 5 G (frequency 33 Hz, single amplitude 2.4 mm) (b) Acceleration 2 G (frequency 8.3 Hz, single amplitude 14 mm) ) For 2 hours in vertical direction (3) Liquid surface position condition (a) Upper level (UL) -5mm (b) Upper level (UL) ± 0mm (c) Upper level (UL) + 5mm * Upper level is 35mm from top of lid. (4) Gap condition between inner well and outer well 1mm, 2mm, 4mm, 6mm, 10mm (5) Result

[Table 1]

[Table 2] As is clear from these tables, when the gap d between the inner well 6 and the outer well 21 is set in the range of 1 to 6 mm, compared with a conventional lead-acid battery having a lid structure having a single-well structure 6, The overflow performance of the lead storage battery can be reliably improved.

In the above example, the case where the number of the inner wells 6 is two is shown. However, the number of the inner wells 6 may be two or more, and each of the inner wells 6 may be formed between the adjacent wells according to the number of the inner wells 6. What is necessary is just to arrange | position the outer well 21 so that a slit may be closed under the conditions mentioned above.

[0021]

In the lead-acid battery lid structure according to the present invention, the slits are covered at positions outside the inner wells corresponding to the slits between the adjacent wells, and the inner wells on both sides are provided. Since a plurality of outer wells projecting from the lower surface of the lid body with a width dimension that straddles the end of
By closing each slit between adjacent inner wells with each outer well, it is possible to prevent the electrolyte droplets from entering the liquid port plug, thereby improving the overflow performance of the lead storage battery.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of an embodiment of a lid structure of a lead storage battery according to the present invention.

2 is a cross-sectional view of the lead-acid battery shown in FIG. 1 in which the liquid port plug is omitted, taken along a line XX of FIG.

FIG. 3 is a bottom view of the lid structure of the lead storage battery shown in FIG. 1 from which a liquid port plug is omitted.

FIG. 4 is an enlarged view showing a double structure of a well at one liquid port in FIG. 3;

FIG. 5 is a plan view showing a lid structure of a conventional lead storage battery.

6 is a cross-sectional view taken along the line YY in FIG. 5 of the lead storage battery in which the lid structure of the lead storage battery shown in FIG.

FIG. 7 is a bottom view of the lid structure of the lead storage battery shown in FIG. 5 from which the liquid port plug is omitted.

FIG. 8 is an enlarged view showing a single structure of a well at one liquid port in FIG. 7;

FIGS. 9A and 9B are a perspective view and a longitudinal sectional view showing an example of a liquid port plug, and FIG. 9C is an explanatory diagram showing a route when overflowing with the liquid port plug.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery case 2 Lid main body 2a Top plate part 2b Fitting edge part 3 Liquid port part 4 Partition wall 5a, 5b Terminal 6 Well 7 Slit 8 Cylindrical part 9 Female screw part 10 Liquid port plug 11 Cylindrical plug main body 11a Gas passage 11b Cylinder 11ba Splash-proof cylinder 11bb Plug cylinder 11c Top plate 11d Bottom plate 12 Splash-proof means 13 Explosion-proof filter 14 Opening 15 Exhaust port 16 Male screw part 17 Recess 18 Packing 19 Splash-proof plate 20 Electrolyte 20a Electrolyte Liquid surface 21 Outer well 22 Opening

Claims (2)

[Claims] 1. A liquid inlet is provided on a lid body of a lead storage battery,
In a lead-acid battery lid structure in which a plurality of wells are provided with slits between adjacent ones along the circumferential direction on the lower surface of the lid body along the circumferential direction around the liquid port portion, at a position outside each of the wells A plurality of outer wells having a width dimension covering the slits and straddling the ends of the wells on both sides corresponding to the slits, respectively, are protrudingly provided on the lower surface of the lid main body. Battery cover structure. 2. The lead-acid battery lid structure according to claim 1, wherein a gap between the inner well and the outer well is in a range of 1 to 6 mm.