JP2004111199A - Lead-acid storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe lead-acid storage battery of a structure eliminating an unnecessary space in respect of energy density, with a more excellent anti-explosion function, preventing a secondary explosion from an explosion occurring outside the battery. <P>SOLUTION: An exhaust part set in recess on a top lid face of the lead-acid storage battery consists of an explosion-proof filter arranged at the bottom of the exhaust part, a canopy arranged at the top part of the explosion-proof filter, and an exhaust outlet formed between the explosion-proof filter and the canopy, and a topmost end of the exhaust outlet is so structured not to protrude from the top lid face of the lead-acid storage battery. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lead storage battery.
[0002]
[Prior art]
In a lead storage battery, electrolysis of water occurs as a side reaction during charging, and oxygen gas and hydrogen gas are generated as shown in the following equation.
H ₂ O = １ ／ O ₂ + H ₂
The gas has the danger of explosion in the presence of fire. Therefore, even if the gas exhausted outside the storage battery explodes, the fire often flows into the storage battery and has an explosion-proof function so that the storage battery itself does not explode. The explosion-proof function means that when an explosion-proof filter is installed in the exhaust part, ignition and explosion occur outside the storage battery. It is. As the explosion-proof filter, a filter obtained by baking a water-repellent material on a ceramic sintered body or a filter formed of a porous polymer molded body is generally used.
[0003]
Conventionally, the explosion-proof filter having the explosion-proof function was generally mounted so as to protrude from the upper lid of the storage battery. This was not a problem even if the explosion-proof filter protruded from the upper lid, because the positive and negative terminals were often provided so as to protrude from the upper lid. However, in recent years, there has been a growing demand for an improvement in the energy density of the storage battery, and it has become necessary to eliminate unnecessary space. This has increased the number of structures in which terminals are provided below the upper lid surface of the storage battery. Accordingly, attempts have been made to make the explosion-proof filter as low as possible from the top lid surface.
[0004]
FIG. 1 is a cross-sectional view of an essential part showing an example thereof, wherein 1 is a battery cover, 2 is a canopy, 3 is a vent, and 4 is an explosion-proof filter.
[0005]
As shown in FIG. 1, in this example, the explosion-proof filter is located below the upper lid 1, but has a structure in which the canopy 2 slightly protrudes from the upper lid 1. In this case, there is a danger that a secondary explosion will occur subsequently because the structure is such that it is difficult to completely remove the hydrogen gas and the fire around the exhaust part by the blast at the time of the explosion generated outside the storage battery.
[0006]
FIG. 2 is a cross-sectional view of a main part showing another example.
[0007]
As shown in FIG. 2, the canopy 2 is formed on the same surface as the upper lid 1 of the storage battery, has no extra space, and is superior to FIG. 1 in terms of energy density. However, the structure shown in FIG. 2 is also similar to FIG. 1 in that it is difficult to completely remove the hydrogen gas and the fire around the exhaust part by the blast generated at the time of the explosion generated outside the storage battery. Since the exhaust gas is exhausted from the exhaust hole 3, there is a problem that the possibility of occurrence of the secondary explosion is higher than in the case of FIG.
[0008]
[Problems to be solved by the invention]
The problem to be solved by the present invention is a structure that eliminates unnecessary space in terms of energy density, prevents secondary explosion of an explosion generated outside the storage battery, and has a more excellent explosion-proof function. Is to provide.
[0009]
[Means for Solving the Problems]
As means for solving the problem, according to claim 1, there is provided an exhaust portion recessed in the upper surface of the storage battery, wherein the explosion-proof filter is disposed at the bottom of the exhaust portion, and disposed above the explosion-proof filter. It has a structure comprising a canopy and an exhaust port formed between the explosion-proof filter and the canopy, wherein the uppermost end of the exhaust port does not protrude from the upper surface of the storage battery.
[0010]
When the inventor intentionally ignites or explodes around the exhaust part in the charging lead storage battery, the storage battery of the present invention does not generate a continuous secondary explosion, and the fire is also stored in the storage battery. Without introducing it to the explosion-proof function. The reason is that the uppermost end of the exhaust port formed between the explosion-proof filter and the canopy does not protrude from the upper surface of the storage battery. Since the exhaust port does not protrude from the upper surface of the storage battery, hydrogen gas from the inside of the storage battery is always exhausted to the recess through the exhaust port. When an ignition or explosion occurs around the exhaust part, the blast blows off the hydrogen gas and the fire remaining in the concave portion, and a temporary vacuum state is formed in that part. Further, the hydrogen gas generated from the inside of the storage battery does not rise in the vertical direction and is discharged to the outside of the storage battery as it is, but is temporarily converted into a flow in the horizontal direction and is discharged to the outside of the storage battery through the exhaust port. Due to the structure, when the flow of the generated hydrogen gas is changed from the vertical direction to the horizontal direction, the exhaust to the outside of the storage battery is momentarily delayed, and the hydrogen gas exhaust is temporarily shut off. It is considered that the secondary explosion was effectively prevented by the synergistic effect of these two elements, and an excellent explosion-proof function was obtained.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention includes an exhaust unit recessed in a storage battery upper lid surface, an explosion-proof filter disposed at the bottom of the exhaust unit, a canopy disposed above the explosion-proof filter, the explosion-proof filter, and the explosion-proof filter. An explosion-proof function is improved by a structure including an exhaust port formed between the canopies, and the uppermost end of the exhaust port does not protrude from the upper surface of the storage battery. This will be described in detail below with reference to examples.
[0012]
【Example】
FIG. 3 is a sectional view of an essential part showing an embodiment of the present invention, FIG. 4 is a perspective view of an essential part, 5 is a concave exhaust part of the present invention, 3a is an exhaust port of the present invention, and 6 is a concave part. . Other components are denoted by the same reference numerals as in FIG.
[0013]
As shown in FIGS. 3 and 4, the present invention has a structure in which a recessed exhaust portion 5 is provided on the surface of the storage battery upper lid 1 to communicate with the outside of the storage battery, and an explosion-proof filter 4 is disposed below the exhaust portion 5. A top lid 2 is provided on the upper part thereof, an exhaust port 3a is formed between the explosion-proof filter 4 and the canopy 2, and the top end of the exhaust port 3a does not protrude from the surface of the storage battery upper lid 1. It is. Due to the structure in which the exhaust port 3a does not protrude from the upper lid surface 1, hydrogen gas from the storage battery is always exhausted to the recess 6 through the exhaust port 3a. The hydrogen gas and the fire stagnating in the concave portion 6 are eliminated by the blast when an ignition or explosion occurs outside the storage battery, and a vacuum state is temporarily formed in that portion. Further, as shown by the arrow in FIG. 3, hydrogen gas generated from the inside of the storage battery is structurally changed from a vertical direction to a horizontal direction as shown by an arrow in FIG. Create a state. Due to the synergistic effect of these two elements, it is considered that a continuous secondary explosion does not occur when an explosion occurs outside the storage battery, and the explosion-proof function works more effectively.
[0014]
FIG. 5 is a perspective view showing an embodiment of a control valve type lead-acid battery having an explosion-proof function by a recessed exhaust unit according to the present invention, wherein 1 is an upper cover, 5 is a recessed exhaust unit, 6 is a recess, Reference numeral 7 denotes a battery case, 8 denotes an inner lid, and 9 denotes a terminal.
[0015]
In this embodiment, an example of a control valve type lead-acid battery having a nominal voltage of 12 V composed of six single cells (cells) is shown. The canopy 2, the recessed exhaust part 5, and the explosion-proof filter 4 (FIG. (Not shown in the figure) shows a shape molded integrally with the upper lid 1 of the storage battery and disposed at the center. Although not shown in FIG. 5, a liquid inlet having six valve seats is provided on the surface of the inner lid 8, and a safety valve is mounted on the valve seat. The structure is such that hydrogen gas and oxygen gas exhausted from these safety valves are exhausted collectively to the outside of the storage battery from the recessed exhaust portion 5. However, the present invention is not limited to this, and a structure in which the recessed exhaust portion 5 is provided for every several safety valves or for each safety valve may be used.
[0016]
Further, in the example of FIG. 5 described above, a structure is shown in which the upper lid 1 and the canopy 2, the explosion-proof filter 4, and the recessed exhaust portion 5 including the exhaust port 3a are integrally molded. However, the present invention is not limited thereto, and a structure may be employed in which the exhaust portion 5 which is provided separately from the upper lid 1 is molded and fitted into the upper lid 1.
[0017]
【The invention's effect】
As is apparent from the above description, an exhaust portion recessed in the storage battery upper lid surface, an explosion-proof filter disposed at the bottom of the exhaust portion, a canopy disposed at the top of the explosion-proof filter, and the explosion-proof An exhaust port formed between the filter and the canopy is formed, and the uppermost end of the exhaust port does not protrude from the upper cover surface of the storage battery, so that ignition or explosion occurs around the exhaust portion outside the storage battery. The blast also removes the hydrogen gas and the fire remaining in the recesses and temporarily creates a vacuum in that part, and the outside of the storage battery with an exhaust structure that converts the hydrogen gas generated inside the storage battery from vertical to horizontal direction The instantaneous delay of the exhaust gas creates a temporary shut-off state of hydrogen gas and the synergistic effect of the two factors can effectively prevent secondary explosion, and excellent explosion-proof function Obtained its industrial effect is large.
[Brief description of the drawings]
FIG. 1 is a sectional view of an essential part showing an example of a conventional explosion-proof structure.
FIG. 2 is a sectional view of a main part showing another example of a conventional explosion-proof structure.
FIG. 3 is a sectional view of a main part showing an embodiment of the explosion-proof structure of the present invention.
FIG. 4 is a perspective view of an essential part showing an embodiment of the explosion-proof structure of the present invention.
FIG. 5 is a perspective view showing an example of a control valve type lead-acid battery provided with the explosion-proof structure of the present invention.
DESCRIPTION OF SYMBOLS 1 Top cover 2 Top lid 3 Conventional exhaust port 3a Exhaust port 4 of the present invention 4 Explosion-proof filter 5 Recessed exhaust section 6 Recess 7 Battery case 8 Storage battery inner lid 9 Terminal

Claims (1)

An exhaust portion recessed in the upper surface of the storage battery, the explosion-proof filter disposed at the bottom of the exhaust portion, a canopy disposed above the explosion-proof filter, and formed between the explosion-proof filter and the canopy. A lead-acid battery, wherein the exhaust port has a structure in which the upper end of the exhaust port does not protrude from the upper surface of the storage battery.

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