JPH05217597A - Sealed type lead-acid battery - Google Patents

Abstract

PURPOSE:To prevent the flow-out of an electrolyte and sealing oil by forming small projections on the upper surface of a middle cover, forming small projection through holes on a liquid suction sheet, and ultrasonic-wave-welding the small projections and the reverse surface of an upper cover. CONSTITUTION:Through holes 12 are formed in correspondence with the small projections and recessed parts 10 on the surface of a middle cover 2. On the reverse surface of an upper cover 3, ribs 7 are formed in correspondence with the small projections 8. The small projection 8 and the rib 7 contact through the small projection through hole 12 on a liquid suction sheet 1. The contact part is fused by ultrasonic wave. Since the liquid suction sheet 11 can be installed widely over the nearly whole region on the upper surface of the middle cover 2, the liquid suction faculty is improved, and liquid leak can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed lead-acid battery, and more particularly to a liquid absorbing sheet installed between an inner lid and an upper lid to absorb an electrolytic solution.

[0002]

2. Description of the Related Art A conventional sealed lead-acid battery will be described with reference to FIG.

As shown in FIG. 2, a conventional sealed lead-acid battery has a battery case 1 having a plurality of cell chambers, an electrode plate group housed in each cell chamber, an inner lid 2 and an upper lid 3 for covering the battery case. It consists of and. The inner lid 2 has a safety valve 4 for promptly releasing the gas to the outside of the battery when the pressure of the gas generated by charging and discharging from the electrode plate group housed in each cell chamber exceeds a predetermined value.
Is provided.

Here, the battery case 1 is provided on the flat portion of the surface of the inner lid 2.
A hollow 5 and an exhaust pipe 6 for accommodating a valve are formed facing each other in the upper part of each cell chamber, and a safety valve 4 is mounted on the upper part of each exhaust pipe 6.

When mounting this valve, the safety valve 4 and the exhaust pipe 6
Between them, a sealing oil such as polybutene is applied for stable operation of the safety valve and keeping airtight.

Further, a rib-shaped low wall is provided around the upper surface of the inner lid 2, and the upper lid 3 is fitted inside the wall to cover the safety valve portion. A small rib 7 is provided on the back surface of the upper lid 3 in the peripheral portion thereof, and the rib 7 and the surface of the inner lid 2 are in contact with each other, and the contact portion is welded by ultrasonic waves.

However, in such a structure, when the battery is overcharged, the sulfuric acid electrolyte leaked from the safety valve may leak between the inner lid and the upper lid to the outside of the battery.

Further, the oil applied between the safety valve and the exhaust pipe sometimes leaks out of the battery through the space between the inner lid and the upper lid. Furthermore, since a thin top lid is installed on top of the inner lid, the top lid may come off or float up from the inner lid until the inner lid and the upper lid are ultrasonically welded. It was difficult to carry out the work. In order to solve such problems, the following two measures are taken.

One of them is to absorb the electrolytic solution or the sealing oil in order to prevent the electrolytic solution or the sealing oil leaking from the safety valve from leaking outside the battery through the space between the inner lid and the upper lid. A rectangular cardboard-like liquid absorbing sheet that can be used is installed between the inner lid and the upper lid.

Another is to provide a plurality of convex portions on a part of the periphery of the back surface of the upper lid in order to fix the position of the upper lid and the inner lid, and to provide corresponding concave portions on the surface of the inner lid. The position is fixed by fitting these protrusions and recesses.

[0011]

However, as described above, convex and concave portions are provided in a part of the peripheral portion of each of the back surface of the upper lid and the surface of the inner lid, and the liquid absorbing sheet is installed between the upper lid and the inner lid. In the method described above, it is necessary to provide both a concave portion for fixing the position of the upper lid and an ultrasonic welding portion for welding the inner lid and the upper lid in the peripheral portion of the inner lid. It was limited to the central part of the surface of the inner lid so as not to interfere with position fixing and welding.

Therefore, the area of the liquid absorbing sheet becomes smaller than the area of the surface of the inner lid, and when a large amount of electrolyte leaks from the safety valve, the liquid absorbing sheet does not absorb the electrolyte or sealing oil. There was a limit, and the electrolyte that could not be absorbed sometimes leaked out of the battery.

The present invention is intended to solve such a problem. When a battery is used, the electrolyte does not leak out of the battery even when the electrolyte flows from the safety valve in a large amount. It is intended to provide a sealed lead-acid battery including a liquid absorbing sheet capable of sufficiently absorbing and fixing sealing oil between an inner lid and an upper lid.

[0014]

In order to achieve the above object, in the present invention, a battery case having a plurality of cell chambers, an electrode plate group housed in each cell chamber of the battery case, and each cell chamber are provided. An inner lid provided with a safety valve facing above the upper lid, and an upper lid covering the inner lid,
It is composed of a liquid absorbing sheet installed between the inner lid and the upper lid, and a plurality of convex or concave portions are provided on the back surface of the upper lid, and corresponding concave or convex portions are provided on the surface of the inner lid. A sealed lead-acid battery in which the upper lid and the inner lid are positioned by fitting of these protrusions and recesses and both lids are welded to each other, wherein the inner lid has a plurality of small protrusions on a flat surface portion thereof. The liquid absorbing sheet is provided with small projection through holes at positions corresponding to the small projections, and the small projections of the inner lid and the back surface of the upper lid are ultrasonically welded to each other through the small projection through holes. It was done.

[0015]

The function and function of the battery of the present invention will be described with reference to FIG.

As shown in FIG. 1, the inner lid 2 is provided with a plurality of small projections 8 on the upper plane portion of its surface for welding. Further, a part of the inner lid 2 is provided with a concave portion 10 corresponding to the convex portion 9 provided on the back surface of the upper lid 3 for fixing the positions of the inner lid 2 and the upper lid 3.

Further, the liquid absorbing sheet 11 is provided with through holes 12 corresponding to the plurality of small projections 8 and the recesses 10 provided on the surface of the inner lid 2. A rib 7 is provided on the back surface of the upper lid 3 at a position corresponding to the small projection 8 on the surface of the inner lid 2. The small projection 8 of the inner lid 2 and this rib 7 are small on the liquid absorbing sheet 11. Contact is made through the projection through holes 12, and this contact portion is welded by ultrasonic waves.

As a result, the liquid absorbing sheet for absorbing the safety valve and the sealing oil can be widely and longly installed over almost the entire upper surface of the inner lid 2, so that the liquid absorbing ability of the liquid absorbing sheet is improved. be able to.

Therefore, even if a large amount of electrolyte leaks from the safety valve at the time of overcharging, the electrolyte absorbing sheet can completely absorb the electrolyte and prevent the electrolyte from leaking to the outside of the battery. can do.

[0020]

Embodiments of the present invention will be described below with reference to FIG. 1 showing an exploded perspective view of a sealed lead-acid battery. In the sealed lead-acid battery of the present invention, the upper portion of the battery case 1 having a plurality of cell chambers each accommodating the electrode plate group is covered with the inner lid 2. Here, a recess 5 and an exhaust pipe 6 for accommodating a valve corresponding to the upper side of each cell chamber are formed in a flat surface portion of the upper surface of the inner lid 2, and the safety valve 4 is provided above the exhaust pipe 6, respectively. Is installed.

Further, a plurality of small projections 8 are provided on the other flat surface portion of the upper surface of the inner lid 2, and a pin provided on the back surface of the upper lid 3 for fixing the positions of the inner lid 2 and the upper lid 3. The concave portion 10 corresponding to the convex portion 9 is provided. Then, a liquid absorbing sheet 11 having through holes 12 provided corresponding to the plurality of small projections 8 and the recesses 10 provided on the inner lid 2 is installed on the upper surface of the inner lid.

The pin-shaped convex portion 9 of the upper lid 3 is attached to the liquid absorbing sheet 11
Through the through hole 12 and inserted into the recess 10 of the inner lid 2,
While fixing the inner lid 2 and the upper lid 3, the small protrusions 8 on the surface of the inner lid 2 and the ribs 7 on the back surface of the upper lid 3 were brought into contact with each other, and the contact portion was welded by ultrasonic waves. As a result, the liquid absorbing sheet 11 that absorbs the electrolyte that has leaked from the safety valve 4 can be arranged over almost the entire upper surface of the inner lid 2, and even if a large amount of electrolyte leaks from the safety valve 4 during overcharging or the like. , The liquid-absorbent sheet was absorbed, and it could be done without leaking to the outside of the battery.

[0023]

As described above, according to the sealed lead-acid battery of the present invention, a plurality of small protrusions are formed on the flat surface of the upper surface of the inner lid, and the small sheet is formed on the liquid absorbing sheet that absorbs the electrolytic solution and the sealing oil. Small projection through holes corresponding to the projections are respectively provided, and the small projections of the inner lid and the back surface of the upper lid are ultrasonically welded through the small projection through holes. It can be arranged over almost the entire area of the upper surface of the inner lid without obstructing welding, and a large amount of the electrolyte solution or sealing oil leaked from the safety valve can be quickly absorbed without leaking to the outside of the battery.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a sealed lead acid battery of the present invention.

FIG. 2 is an exploded perspective view of a conventional sealed lead-acid battery

[Explanation of symbols]

 1 Battery Case 2 Inner Lid 3 Upper Lid 4 Safety Valve 5 Inner Lid Dimple 6 Exhaust Cylinder 7 Rib 8 Small Projection 9 Upper Lid Projection 10 Inner Lid Recess 11 Liquid Absorption Sheet 12 Small Projection Through Hole

Claims (1)

[Claims] 1. A battery case having a plurality of cell chambers, an electrode plate group housed in each cell chamber of the battery case, an inner lid provided with a safety valve facing above each cell chamber, It comprises an upper lid that covers the lid, and a liquid absorbing sheet installed between the inner lid and the upper lid, and a plurality of protrusions or depressions are provided on the back surface of the upper lid, and corresponding depressions or protrusions are provided on the inner lid. A sealed lead-acid battery provided on the surface of the above, wherein the upper lid and the inner lid are positioned by fitting of these protrusions and recesses, and both lids are welded to each other. However, the liquid absorbing sheet is provided with small projection through holes at positions corresponding to the small projections, and the small projections of the inner lid and the back surface of the upper lid are connected to each other through the small projection through holes. Sealed lead acid battery ultrasonically welded.