JPH0416374Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a sealed lead battery, and particularly relates to an improvement of the gas discharge valve thereof.

[Prior Art] In general, a sealed lead battery has a structure in which an electrolyte is impregnated into an electrode plate and a non-woven fabric such as glass or a woven fabric called a retainer, and the cathode plate absorbs oxygen gas generated from the anode plate. It is a gas absorption type battery. The container of this sealed lead battery is equipped with a gas discharge valve for discharging unabsorbed gas. In other words, the gas discharge valve is activated at the end of charging or when an abnormally large charging current flows, the gas absorption reaction at the cathode plate stops producing oxygen, and the internal pressure of the battery rises to a certain level. It operates to discharge oxygen gas to the outside of the battery.

Conventionally, such a gas discharge valve 1 has a recess 3 provided by recessing the top surface of a battery case 2 as shown in FIG. An exhaust pipe 5 is provided, a valve body 6 made of a cap-shaped elastic body is fitted into the exhaust pipe 5, and a top plate 7 is screwed onto the entrance of the recess 3. It had a structure in which holes 8 were provided. The cap-shaped valve body 6 has a smaller outer diameter than the exhaust pipe 5, and is adapted to withstand a predetermined pressure change by tightly fitting into the exhaust pipe 5. The operating pressure of the gas exhaust valve 1 having such a structure is controlled by the hardness of the valve body 6 and the like.

However, in the gas exhaust valve 1 as shown in FIG. The outer diameter of the valve body 6 must be made much smaller than the outside diameter of the cylinder 5 so that tension is generated in the valve body 6 when it is fitted into the exhaust pipe 5. The operating pressure also increases, and battery case 2
There was a problem with blistering. In addition, the valve body 6
Since tension is constantly acting on the , there was a problem that the deterioration was significant.

Therefore, recently, a sealed lead battery having a gas discharge valve 1 as shown in FIGS. 3 and 4 has been proposed. That is, in this case, the gas exhaust valve 1 in the sealed lead battery has no exhaust tube protruding from the bottom surface 3 of the recess 2, and is flat, with only the battery case exhaust hole 9 formed therein. Inside the recess 2, an elastic inverted bowl-shaped valve element 10 is disposed so as to cover the battery case exhaust hole 9, with its opening side outer peripheral edge 10A serving as a valve seat with the flat bottom surface 4 of the recess 3. There is. The top plate 7 is screwed into the recess 3 so as to press the valve body 10.

In such a sealed lead battery, at the end of charging or when an abnormally large charging current flows, oxygen gas exceeding the oxygen gas absorption capacity of the cathode plate is generated, and the internal pressure of the battery case 2 exceeds the operating pressure of the valve body 10. When rises,
The valve body 10 is opened and oxygen gas is exhausted from the top plate exhaust hole 8 to the outside of the battery.

When the pressure is reduced, the valve body 10 is closed as shown by the broken line in FIG.
However, since the valve is deformed so as to stick to the valve seat formed by the flat bottom surface 4 of the recess 3, the airtightness is sufficiently maintained. With the valve body 6 shown in Fig. 2, the operating pressure must be set to 0.2 kg/cm ² or more during pressure increase in order to maintain airtightness during pressure reduction, but the valve body 6 shown in Fig. 3 10, it is possible to lower the operating pressure to about 1/10 of the conventional pressure. Therefore, the problem of having to increase the operating pressure during pressure increase can be solved.

[Problems to be solved by the invention] However, in a sealed lead-acid battery as shown in FIG. There is a problem in that when a strong force is applied, the operating pressure of the valve body 10 changes significantly.

An object of the present invention is to provide a sealed lead battery that can prevent the operating pressure of the valve body from changing significantly even if the valve body, top plate, etc. are misaligned.

[Means for Solving the Problems] The structure of the present invention for achieving the above object will be explained with reference to FIG. 1 corresponding to the embodiment. A gas discharge valve 1 that prevents the inflow of air is provided in the battery case 2, and the gas discharge valve 1 has a recess 3 provided on the outer surface of the battery case 2, and a flat bottom surface 4 of the recess 3 that connects the battery case 2 with the gas discharge valve 1. A battery case exhaust hole 9 is formed to communicate with the inside of the tank 2, and the opening side outer peripheral edge 10A is placed inside the recess 3 so as to cover the battery case exhaust hole 9, using the flat bottom surface 4 as a valve seat. An elastic, inverted bowl-shaped valve body 10 disposed in contact with each other, a top plate 7 disposed in the recess 3 so as to press the valve body 10, and a top plate provided on the top plate 7. In a sealed lead-acid battery having an exhaust hole 8, the inverted bowl-shaped valve body 10 has a protrusion 10 at its top.
B is provided, and the portion around the protrusion 10B is a thin portion 10C.

[Function] In this way, the valve body 10 has a protrusion 1 at its top.
0B and the area around the protrusion 10B is made into a thin wall portion 10C, if the position of the valve body 10, top plate 7, etc. is misaligned and a force in an inappropriate direction or with an inappropriate strength is applied. , the thin wall portion 10C around the protrusion 10B of the valve body 10 absorbs the force, and the valve body 10
Prevent large changes in operating pressure.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to FIG. Note that parts corresponding to those in FIG. 3 described above are indicated with the same reference numerals.

In the sealed lead battery of this embodiment, the upper part of the inverted bowl-shaped valve body 10 of the gas discharge valve 1 has a spherical shape, and a protrusion 10B is provided at the top, and the area around the protrusion 10 is thin. It is labeled as section 10C.

When the valve body 10 is shaped like this, the valve body 10
If a force is applied in an inappropriate direction or strength due to misalignment of the top plate 7, etc., the force can be absorbed by the thin wall portion 10C around the protrusion 10B of the valve body 10, and the operating pressure of the valve body 10 is increased. Prevent it from changing.

[Effects of the invention] As explained above, the sealed lead battery according to the invention includes a protrusion provided at the top of the valve body of the gas discharge valve,
In addition, since the area around the protrusion is made of a thin wall, if the valve body, top plate, etc. become misaligned and a force in an inappropriate direction or strength is applied,
The thin wall around the protrusion of the valve body can absorb the force.
It is possible to prevent the operating pressure of the valve body from changing significantly.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a main part of an embodiment of a sealed lead battery according to the present invention, Fig. 2 is a longitudinal cross-sectional view of a main part of a conventional sealed lead battery, and Fig. 3 is a longitudinal cross-sectional view of a main part of a conventional sealed lead battery. FIG. 4 is a vertical sectional view of the main part of the example, and is an explanatory diagram of the operation of the valve body shown in FIG. 3. 1...Gas exhaust valve, 2...Battery container, 3...Recess, 4...Bottom surface, 7...Top plate, 8...Top plate exhaust hole, 9...Battery case exhaust hole, 10B...Protrusion , 10C
...thin section.

Claims (1)

[Scope of Claim for Utility Model Registration] A gas discharge valve is provided on the battery case to discharge gas and prevent air from entering from outside, and the gas discharge valve includes a recess provided on the outer surface of the battery case; A battery case exhaust hole is formed in the flat bottom of the recess so as to communicate with the inside of the battery case, and a peripheral edge on the opening side is placed inside the recess so as to cover the battery case exhaust hole and use the flat bottom as a valve seat. an elastic inverted arm-shaped valve body disposed with the parts in contact with each other; a top plate disposed in the recess so as to press the valve body; and a top plate exhaust hole provided in the top plate. In the sealed lead battery, the inverted bowl-shaped valve body is provided with a protrusion at the top thereof, and a portion around the protrusion is a thin-walled portion. Lead battery.