JPH0626157U - Valve body of safety valve for sealed battery - Google Patents

Abstract

(57) [Abstract] [Objective] The shape of the valve body 15 is improved so that it can be easily and inexpensively manufactured by punching a plate made of a rubber-like elastic body, and the terminal head 11 can be easily loaded. Fully exhibit the function as a safety valve. [Structure] A rubber-like elastic body is formed into a trapezoidal shape having a thick upper end and a thin lower end, and side surfaces which are recessed inward in the middle of the upper and lower sides. The inner diameter of the upper end of the tubular portion 11a of the terminal head 11 is set to be substantially equal to the inner diameter, and the thickness of the lower end is set to a size capable of covering the lid-side exhaust hole 10a provided in the sealing lid 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve element of a safety valve for a sealed storage battery such as a nickel-cadmium storage battery or a nickel-hydrogen storage battery.

[0002]

[Prior art]

 Sealed batteries such as nickel-cadmium storage batteries and nickel-hydrogen storage batteries are equipped with an explosion-proof safety valve to prevent the batteries from bursting when the gas pressure inside the batteries rises. As such a safety valve, the one shown in FIG. 2 is known. In FIG. 2, reference numeral 10 denotes a sealing lid of a battery body accommodating a power generating element. The sealing lid 10 is provided with a first exhaust hole 10a for detecting the gas pressure. The terminal head 11 is fixed to the upper surface of the. The terminal head portion 11 includes a tubular portion 11a surrounding the first exhaust hole 10a and a top portion 11b that closes the upper end of the tubular portion 11a. The individual second exhaust holes 11c are opened.

A valve body 12 made of a rubber-like elastic body is mounted inside the terminal head 11. The illustrated valve body 12 has a columnar portion 12a formed to be thinner than the inner diameter of the tubular portion 11a of the terminal head 11 and thicker than the first exhaust hole 10a, and has a diameter substantially equal to the inner diameter of the tubular portion 11a. 12b is provided, the columnar portion 12a is positioned by this flange 12b, the height of the columnar portion 12a is set to be slightly larger than the height of the lower surface of the top plate portion 11b, and the terminal head 11 is attached to the sealing lid 10. By compressing the columnar portion 12a when fixing, the first exhaust hole 10a is elastically closed at the lower end of the columnar portion 12a, and when the gas pressure inside the battery rises, the columnar portion 12a is caused by the gas pressure. The lower end is pushed up from below to open the first exhaust hole 10a, and the gas is discharged from the second exhaust hole 11c.

It should be noted that instead of the flange 12c, a large number of protrusions are provided, the columnar portion 12a is formed to have a thickness substantially equal to the inner diameter of the tubular portion 11a, and vertical grooves are provided on the side surfaces. Something is known. Further, the flange 12c is omitted, and the upper and lower ends of the columnar portion 12a are formed to have a thickness substantially equal to the inner diameter of the tubular portion 11a, and the upper and lower intermediate portions are largely recessed inward to form an inner surface of the tubular portion 11a. It is known that a space is formed between the surface of the columnar portion 12a (see Japanese Utility Model Laid-Open No. 63-179655).

[0005]

[Problems to be solved by the device]

 The valve body 12 made of the rubber-like elastic body shown in FIG. 2 is usually very small, and the flange 12b is projected around the valve body 12. Therefore, when the valve body 12 is loaded into the terminal head 11, the flange 12b is There is a problem in that it is difficult to load because it is caught in the tubular portion 11a of 11 and that it is necessary to mold using a mold during manufacturing, which increases the manufacturing cost. In addition, there are almost the same problems in the case where a large number of protrusions are provided instead of the flange and the case where a vertical groove is provided. In addition, if the upper and lower ends are formed to have a thickness approximately equal to the inner diameter of the tubular part, and the middle of the upper and lower parts is largely recessed inward, it is necessary to mold using a mold in the same manner as above, and Since the thickness is substantially equal to the inner diameter of the tubular portion, there is a problem that the first exhaust hole 10a is difficult to open when the gas pressure rises.

The present invention improves the shape of the valve body so that it can be easily and inexpensively manufactured by punching a plate made of a rubber-like elastic body, facilitates the loading of the terminal head, and further, the safety valve It is possible to fully utilize the function as the above, and to use the conventional terminal head or sealing lid as it is.

[0007]

[Means for Solving the Problems]

 A valve body of a safety valve for a sealed battery according to the present invention comprises a tubular portion surrounding a first exhaust hole provided in the lid and a tubular portion on the lid of a battery body accommodating a power generating element. A top plate part that closes the upper end of the part, and the terminal head with the second exhaust hole is fixed to the tubular part, and the valve body made of a rubber-like elastic body is loaded inside the terminal head. Is a valve body of a safety valve for a sealed battery, which elastically closes the first exhaust hole, and has a rubber-like elastic body formed into a trapezoidal shape with a thick upper end and a thin lower end, and the upper end is the terminal head portion. The thickness is set so that it can be easily inserted into the cylindrical part of the, and the lower end is thick enough to cover the above-mentioned second exhaust hole, and the side faces are formed in a shape that is slightly concave in an arc shape in the middle between the upper and lower sides. It is characterized by that.

The cross-sectional shape of the valve body may be square or circular, and can be formed according to the cross-sectional shape of the tubular portion of the terminal head. If the tubular portion has a rectangular cross-section, A circular cross-sectional shape inscribed inside is preferable. The vertical cross section is a symmetrical trapezoid with a long upper side and a short lower side, with the left and right hypotenuses curved inward, with the lower side smaller than the upper side and larger than the diameter of the first exhaust hole. Is set. Further, the height (thickness of the valve body) is preferably smaller than the length of the lower side. The height described above is set to be slightly larger than the height of the lower surface of the top plate portion of the terminal head, and is compressed during mounting. The compression allowance is set according to the hardness of the rubber-like elastic body and the degree of operating pressure of the valve body, but is usually preferably 10 to 20% of the height.

In the nickel-cadmium storage battery that is most frequently used as a sealed storage battery, the cylindrical portion of the terminal head has an inner diameter of 3.0 mm, a height of 1.8 mm, and a diameter of the first exhaust hole of 1.5. It is set to mm, but the preferable shape of the valve body to be loaded in this terminal head is that the diameter of the upper end (upper side) is 2.7 mm or more when using rubber with JIS-A rubber hardness of 75 degrees. Less than 0.0 mm, lower end diameter (lower side) of 2.2 mm or more and 2.6 mm or less, height before loading is 2.0 mm or more and 2.2 mm or less, and maximum dent on the side surface is 0.1 mm or more and 0.4 mm or less. is there.

[0010]

[Action]

 When the above valve body is inserted into the tubular part of the terminal head from the large diameter side of the upper end, the valve body has no protrusions, so the upper end of the valve body can be easily attached to the top plate of the terminal head without being caught. Upon arrival, the valve body is fixed to the terminal head. Then, when the terminal head is fixed on the sealing lid of the battery body, the lower end of the valve body overlaps the first exhaust hole to close the exhaust hole. In this case, since the lower end of the valve body is thinner than the upper end, a space that allows lateral expansion of the valve body is formed between the valve body and the lower portion of the tubular body of the terminal head. Therefore, when the gas pressure in the battery body increases and reaches a predetermined level (operating pressure), the lower end of the valve body is pushed up by the gas and floats from the sealing lid body, opening the first exhaust hole and opening the terminal. The gas is discharged from the second exhaust hole by being connected to the second exhaust hole of the head. Then, when the gas pressure becomes lower than the operating pressure, the valve body returns to its original state by its own elasticity, and the lower end thereof closes the first exhaust hole.

However, if the upper end of the valve body is thicker than the inner diameter of the tubular portion, it becomes difficult to load it into the tubular portion, and if it is too thin, the position of the valve body becomes unstable after loading. Also, if the lower end of the valve body is too thick, the space between the valve body and the tubular portion becomes narrow, and mounting of the valve body and lateral expansion due to operating pressure become impossible. Conversely, if it is too thin, the first exhaust hole The blockage becomes incomplete and causes gas leakage. Further, if the height of the valve element is too low, the first exhaust hole will open with a low gas pressure, and if it is too high, the first exhaust hole will be difficult to open. Moreover, since the side surface of the valve body is formed in a shape that is slightly recessed in an arc shape in the middle between the upper and lower sides, the above-described lateral expansion can be made easier and the second exhaust hole can be closed during the lateral expansion. Absent.

Further, since the upper end of the valve body is thicker than the lower end and the side surface is recessed, it is possible to manufacture by punching a rubber plate. That is, when the punching die is applied to the rubber plate, the rubber plate is compressed, so by punching the rubber plate using a die with the inner diameter of the upper end of the valve disc, the upper end becomes the diameter (inner diameter) of the die. Equally, the lower end is thinner than the upper end, and a valve body with a recessed upper and lower middle is obtained, and depending on the outer shape of the edge of the die, the punching speed, the hardness of the rubber plate, etc., the thickness of the lower end and the middle The size of the recess is set. On the other hand, if the above-mentioned dent is not present, or conversely it is a convex shape, lateral expansion becomes difficult, and the second expansion hole is blocked by lateral expansion, and it becomes difficult to manufacture the rubber plate by punching. Compression molding is required.

[0013]

【Example】

 In FIG. 1, 10 is a sealing lid of the battery main body, and 11 is a terminal head. These are the same as conventional ones, and the sealing lid 10 is provided with a first exhaust hole 10a. Moreover, the terminal head portion 11 is composed of a tubular portion 11a and a top plate portion 11b, and a plurality of second exhaust holes 11c are opened in the lower portion of the tubular portion 11a. The valve body 15 fitted in the terminal head 11 has an outer diameter at the upper end slightly smaller than the inner diameter of the tubular portion 11a of the terminal head 11, and an outer diameter at the lower end smaller than the upper end. 1 is set to be thicker than the inner diameter of the exhaust hole 10a, and the height is set to be slightly larger than the depth of the cylindrical portion 11a (the height of the top plate portion 11b) as shown by the chain line 15a. When the terminal head 11 is fixed, the valve body 15 preloaded in the terminal head 11 is compressed in the height direction, and the lower end of the valve body 15 completely closes the first exhaust hole 10a. At the height of the second exhaust hole 11c provided in the body 11a, a space that allows the valve body 15 to expand is formed between the tubular body 11a and the valve body 15.

A valve body 15 having the above-mentioned shape was manufactured by punching a rubber plate. The terminal head 11 of the target battery has a cylindrical portion 11a having an inner diameter of 3.0 mm, a depth of 1.8 mm, a first exhaust hole 10a having a diameter of 1.5 mm, and JIS-A rubber hardness. A rubber plate having a thickness of 75 mm and a thickness of 2.1 mm was punched with a die having an inner diameter of 2.8 mm to obtain a chain valve body 15a. This valve body 15a has an upper end diameter of 2.8 mm, a lower end diameter of 2.6 mm, a height of 2.1 mm, and a maximum side surface depression d of 0.15 to 0.20 mm. It could be easily loaded into part 11 and operated at a gas pressure of 11 ± 3 kg / cm ² .

[0015]

[Effect of device]

 As described above, the valve body of the present invention is formed in a trapezoidal shape in which the upper end is thick and the lower end is thin and the side faces are recessed inward at the middle of the upper and lower sides by the rubber-like elastic body, and the thickness of the upper end is the battery body. The thickness is such that it can be easily inserted into the tubular part of the terminal head fixed to the sealing lid, and the thickness of the lower end is large enough to cover the first exhaust hole provided in the sealing lid. Since it has been set, it is easy to load by inserting the large diameter upper end into the cylindrical part of the terminal head before fixing the terminal head to the sealing lid. By this loading, the position of the lower end of the valve body is fixed on the center line of the tubular portion of the terminal head, and a space is formed between the lower portion of the valve body and the inner surface of the tubular portion. Can be operated without any problem. Further, the above valve body can be manufactured by punching the plate material, and the production cost can be made lower than before.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an example.

FIG. 2 is a vertical sectional view of a conventional example.

[Explanation of symbols]

 10: Sealing Lid of Battery Body 10a: First Exhaust Hole 11: Terminal Head 11a: Cylindrical Part 11b: Top Plate 11c: Second Exhaust Hole 15: Valve Body in Loaded State 15a: Valve Body before Loading

Claims (1)

[Scope of utility model registration request] 1. A cylindrical portion surrounding a first exhaust hole provided in the sealing lid and a top plate portion closing the upper end of the cylindrical portion, on the sealing lid of the battery main body accommodating the power generation element. And fixing the terminal head portion provided with the second exhaust hole to the tubular portion,
This is a valve body of a safety valve for a sealed battery in which a valve body made of a rubber-like elastic body is loaded inside the terminal head so as to elastically close the first exhaust hole. The upper end is thick and the lower end is thin trapezoidal, and the upper end is set to a thickness that can be easily inserted into the tubular portion of the terminal head, and the lower end is set to a thickness that can cover the second exhaust hole.
A valve body of a safety valve for a sealed battery, wherein a side surface is formed in a shape that is slightly recessed in an arc shape in the middle between the upper and lower sides.