JPH0421312B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to rechargeable electric appliances such as waterproof electric shavers and electric tooth brushes.

[Conventional technology]

Generally, small rechargeable electrical devices such as waterproof electric shavers and electric tooth brushes have a storage battery made of a Nickel-cadmium battery built into a sealed housing, and can be recharged as needed. It can be used repeatedly without replacing the battery. By the way, when this type of storage battery is reverse charged, overcharged during rapid charging, or charged at extremely low temperatures, a large amount of gas (O ₂ gas and H ₂ gas) is generated inside the storage battery due to charge/discharge reactions. occurs. This charging/discharging reaction is a so-called water electrolysis reaction, and H ₂ gas and O ₂ gas are generated at a ratio of 2:1.

The above gas generation reaction does not occur under normal charging conditions, but if a storage battery is charged using the incorrect charging method as described above, a large amount of gas will be generated due to the gas generation reaction, causing the internal gas pressure of the storage battery to rise abnormally. There is a risk that the battery will explode. Therefore, storage batteries are equipped with a safety valve that opens when the internal gas pressure reaches an abnormally high level, and releases a large amount of generated gas to the outside as appropriate to prevent the internal gas pressure from exceeding a certain level. ing.

[Problem to be solved by the invention]

However, in the conventional example described above, a storage battery with a safety valve and electronic components such as a motor, switch, and wiring are housed in a housing with a sealed structure to make it waterproof. When the gas generated in the housing is released from the gas vent hole, the housing is filled with explosive gas ( _H2 gas explosion concentration range is 4-75%), and sparks (arc) are generated in the motor commutator. There was a risk of the gas igniting and causing an explosion. Further, when the electrolyte (alkaline solution) of the storage battery leaks from the gas vent hole when gas is released, there is a problem in that electrical components within the housing are corroded, causing failure.

The present invention has been made in view of the above points, and its purpose is to provide a safety valve that opens when the internal gas pressure of a storage battery becomes abnormally high during rapid charging of the storage battery. The purpose is to prevent the released explosive gas from diffusing into the housing, thereby preventing explosions caused by the gas or corrosion of electrical parts by the electrolyte.

[Means to solve the problem]

The rechargeable electric device of the present invention is a rechargeable electric device in which a storage battery is housed in the same housing having a sealed structure, and a storage battery is provided at one end with a gas vent hole for a safety valve that is opened when the internal gas pressure becomes abnormally high. type electrical equipment, the cap is made of an elastic material and has a battery holding part that covers the end of the storage battery in which the gas vent hole of the safety valve is opened and is fitted around the outer periphery of the storage battery, and one end is connected to the cap. The storage battery, the cap, and the ventilation means are integrally fixed to a battery holder to form a block.

[Effect]

The present invention is configured as described above, and provides a rechargeable electric device comprising a storage battery provided with a safety valve at one end and housed in the same housing having a sealed structure, in which the end of the storage battery is opened with the gas vent hole of the safety valve. The cap is made of an elastic material and has a battery holding part that is fitted around the outer periphery of the storage battery, and a ventilation means that has one end connected to the cap and the other end exposed outside the housing. This prevents the explosive gas released into the housing from diffusing into the housing through the safety valve that is opened when the internal gas pressure of the storage battery becomes abnormally high during rapid charging, etc., and prevents explosions due to gas or electrolyte. Corrosion of electrical parts can be prevented.

Furthermore, since the storage battery, cap, and ventilation means are integrally fixed to the battery holder and made into a block, the structure is simple and assembly is easy, and gas leakage can be checked before assembly. Furthermore, the storage battery can be reliably fixed to the battery holder by the battery holding portion of the cap that is fitted around the outer periphery of the storage battery.

〔Example〕

FIG. 1 is an external perspective view of an electric shaver according to the present invention, and 1 is a housing having a razor blade 2 at one end and a socket 3 to which a charging adapter 8 is connected at the other end; A storage battery 6 and a razor blade drive motor 5 supplied with power from the storage battery 6 are housed inside. The charging adapter 8 outputs a DC power source obtained by step-down rectifying a commercial power source, and is detachably attached to the socket portion 3 so as to enable floating charging. 7 is a display window that displays when charging is in progress. Second
7 to 7 are diagrams showing the configuration of each part, and 10
has a side opening 11 at one end and a downward opening 1 at the other end.
2, the side opening 11 of this housing body 10 is covered with a razor blade part 2, and the lower opening 12 is covered with a bottom cover 1.
3 are covered with O-rings 20 and 87, respectively, thereby forming a housing 1 having a sealed structure. 14a and 14b are anti-slip side covers fitted to the outer surface of the housing body 10, one side cover 14a
A switch handle 15 having a lock button 16 is slidably attached to the upper part of the switch handle 15, and a magnet (not shown) attached to the back side of the switch handle 15 and a reed switch disposed inside the housing 1 are connected to each other. 17 constitutes a power switch 18. The razor blade portion 2 is fitted onto the side opening 11 of the housing body 1 with a screw 21 via an O-ring 20.
A motor mount 22 in which the motor 5 is fitted into a recess on the lower surface; a water washing ring 23 having a through hole 23a on the circumferential surface and rotatably attached to the motor mount 22;
an outer cutter mount 26 having an outer cutter mounting thread groove 24 and attached to the motor mount 22 with screws 25; an inner cutter block 29 with an inner cutter 28 protruding from the top surface of the base 27; An outer cutter block 33 includes an outer cutter 30 having a dome-shaped surface with a large number of hair introduction holes, and a threaded portion 32 on the outer peripheral surface of the lower end of a cylindrical base 31, a cap holder 34, and a cap cover 35. It consists of a razor blade cover 36,
The rotating shaft 5a of the motor 5 is protruded from the upper surface of the motor mounting base 22 through a bushing 37, and the rotating shaft 5a of the motor 5 is
The inner cutter block 29 is rotationally driven via a drive shaft 38 fitted to the inner cutter block 29. That is, in the embodiment, the through hole 2 of the flushing ring 23
3a and the through hole 26a of the outer cutter mounting base 26 and place the razor blade 2 into the water, water is introduced into the beard reservoir 39, and the power switch 18 is turned on to rotate the inner cutter block 29. By doing so, the beard debris in the beard reservoir 39 is washed away. Therefore, it is necessary to watertightly separate the interior of the housing 1 in which the motor 5 and storage battery 6 are housed from the beard reservoir 39. A bushing 37 is interposed on the rotating shaft 5a of No. 5 to make the rotating shaft 5a portion watertight. The battery block 40 is
Anode terminal fitting 7 connected to the anode 6a of the storage battery 6
5. A recess 46 of the battery holder 45 into which the cathode terminal fitting 76 connected to the cathode 6b, the motor connection fittings 43a, 43b, and the switch connection fitting 44 are attached.
It is formed by housing the storage battery 6 with the anode 6a facing downward. By the way, the anode 6a of the storage battery 6 has a gas protrusion hole 62 and a valve body 63 provided in a sealing plate 61 that closes the opening of the cylindrical case 60 which becomes the cathode.
A safety valve 67 is provided, which includes a gas vent hole 66 formed in the salient pole portion 65 of the anode terminal plate 64. Reference numeral 70 designates a cap-shaped cap that covers the anode side end of the storage battery 6, and surrounds the gas vent hole 66 of the safety valve 67 to prevent the gas released from the gas vent hole 66 from diffusing into the housing 1. Serves as a preventive measure. The cap 70 is made of an elastic material and has an extended opening edge to form a cylindrical battery holding part 71 for holding the storage battery 6. Convex strip 7
2 fits into an annular groove 37 formed on the peripheral surface of the end of the storage battery 6, thereby holding the storage battery 6 and at the same time preventing the gas released from the storage battery 6 from diffusing into the housing 1 inside the cap 70. It is now sealed tightly. 74 is an anode terminal fitting 75
The anode terminal fitting 75 introduced through the notch 74 is disposed on the inner bottom surface of the cap 70 and connected to the anode 6a of the storage battery 6. 77 is a sealing material that prevents gas from leaking from the introduction portion of the anode terminal fitting 75. A ventilation path 8 is formed between the inside of the cap 70 and the outside of the housing 1 by a ventilation pipe 82.
0, and the gas trapped within the cap 70 is discharged to the outside of the housing 1 via a ventilation path 80. Arrow A shown in FIG. 5 indicates a gas outflow path.

On the bottom cover 13 that closes the lower opening 12 of the housing body 10, a printed circuit board 83 is mounted with a diode D, a resistor R, and a light emitting diode LD for displaying charge, which constitute a charging circuit C as shown in FIG.
is attached, and the bases of charging power supply pins 81a and 81b protruding into the recess 89 on the lower surface of the bottom cover 13 are fixed to the printed circuit board 83 by soldering. 84 is an O-ring for attaching the power supply pins 81a and 81b to the bottom cover 13 in a watertight manner. Here, one power supply pin 81a is formed of a hollow pin, and a ventilation pipe 82 made of a rust-preventing material and having an obliquely cut end is installed in the inner hole of the pin.
When fitting the battery block 40 to the bottom cover 13, the protrusion 70 of the cap 70 is inserted at the upper end of the ventilation pipe 82.
A ventilation passage 80 is formed by breaking through the lower surface of a.
Therefore, if the alkaline electrolyte is released from the storage battery 6 together with the gas, or the ventilation path 80
Even if water enters the ventilation pipe 82
This prevents corrosion of the power supply pin 81a and simplifies the connection operation between the ventilation pipe 82 and the cap 70. In this case, as a matter of course, the inner diameter of the ventilation pipe 82 is made small (0.2 to 2 mmφ) so as not to impair air permeability and to make it difficult for water to enter. In addition, in the embodiment, the lower end of the ventilation pipe 82 is also cut diagonally into the shape of a syringe needle, and even though the inner diameter of the ventilation pipe 82 is made small, the opening area becomes large, so that the lower end of the ventilation pipe 82 is cut diagonally and has a large opening area. It is designed to reduce water intrusion. Note that a filter such as a cavernous body that has air permeability and does not easily allow water to pass therethrough may be installed inside the ventilation pipe 82 to reliably prevent water from entering from the outside. In the figure, 85 and 86 are wiring leads. The bottom cover 13 with the battery block 40 mounted in this manner is covered with the lower opening 12 of the housing body 10 via an O-ring 87 with screws 88. In this embodiment, the portion of the housing 1 other than the portion surrounded by the cap 70 is watertightly disconnected from the outside, and the portion surrounded by the cap 70 is connected to the housing 1 through the ventilation pipe 82.
It communicates with the outside, and is the safety valve 6 of the storage battery 6.
7 is activated and the gas generated in the storage battery 6 is released from the gas vent hole 66, the gas will not diffuse into the portion of the housing 1 where the motor 5 etc. are disposed. There is no danger that sparks from the motor 5 will ignite the gas and cause an explosion, and electrical parts such as the motor 5 and the power switch 18 will not be corroded by the gas and the electrolyte released together with the gas.

8 and 9 show another embodiment, in which an anode fitting hole 9 is provided in the center of the bottom of the cap 70'.
0 and a peripheral projecting wall 91 at the upper end periphery of the anode fitting hole 90.
At the same time, an annular protrusion 92 is provided around the inner bottom surface of the cap 70', and a power supply pin 8 is provided on the outer bottom surface of the cap 70'.
A connecting tube 93 to which the cap 70' is connected is provided with a protruding connecting tube 93, and the circumferential portion of the inner bottom surface of the cap 70' and the circumferential edge of the end surface of the storage battery 6 are fixed with an adhesive, and a heat-shrinkable tube 93 is attached to the storage battery 6. The insulating tube 94 is heat-shrinked to firmly cover the anode side end of the storage battery 6 with the cap 70'. in this case,
The protruding strip 92 is formed by the adhesive in the gas vent hole 66' (sealing plate 6
1 and the anode terminal plate 64) and discharge the electrolytic solution from the gas vent hole 66' into the cap 70'.
This prevents short circuit between the cathode, that is, the cylindrical case 60 and the anode 6a due to water entering through the cylindrical case 60. Note that the sealing plate 61 and the anode terminal plate 64 are fixed by spot welding at several locations in the circumferential direction, and the minute voids formed in the areas other than the spot welds become gas vent holes 66'. Also, power supply pin 8
1a is designed to be directly connected to the connecting tube 93 of the cap 70', so the power supply pin 81a is fixed to the printed circuit board 83 using a nut 94 to prevent the cap 70' from deforming due to the heat of soldering. is prevented. Furthermore, the upper part of the housing 1', which is omitted in the figure, has an upper opening to which the razor blade part 2 is covered, and in the embodiment, the storage battery 6 and the printed matter are mounted on the motor mounting base 95 of the razor blade part. A substrate 83 is integrally attached and formed into a block, and this block is inserted into the cylindrical housing 1' from the upper opening. Therefore, the power supply pins 81 and 81b protrude to the outside through the power supply pin insertion hole 97 formed in the recess 96 on the bottom surface of the housing 1', so that the power supply pin insertion hole 97 and the power supply pin 81a, 8
1b, a waterproof gasket 98 is interposed between the two and 1b to form a sealed structure. In the figure, 75' is an anode terminal fitting, 7
6' is a cathode terminal fitting.

〔Effect of the invention〕

The present invention is configured as described above, and provides a rechargeable electric device comprising a storage battery provided with a safety valve at one end and housed in the same housing having a sealed structure, in which the end of the storage battery is opened with the gas vent hole of the safety valve. The cap is made of an elastic material and has a battery holding part that is fitted around the outer periphery of the storage battery, and a ventilation means that has one end connected to the cap and the other end exposed outside the housing. This prevents the explosive gas released into the housing from diffusing into the housing through the safety valve that is opened when the internal gas pressure of the storage battery becomes abnormally high during rapid charging, etc., and prevents explosions due to gas or electrolyte. This has the effect of preventing corrosion of electrical parts.

In addition, since the storage battery, cap, and ventilation means are integrally fixed to the battery holder and made into a block, the configuration is simple and assembly is easy, and gas leakage can be checked before installation. The battery holding portion of the cap that is fitted into the cap has the effect of reliably fixing the storage battery to the battery holder.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of an embodiment of the present invention, FIG. 2 is a partially cutaway front view of the same, FIG. 3 is an exploded perspective view of a main part of the same, and FIG. 4 is a perspective view of a main part of the same. Fifth
The figure is a sectional view of the main part of the same as above, FIG. 6 is a front view of the main part of the same as above, FIG. 7 is a diagram showing the charging circuit, FIG. 8 is a sectional view of the main part of another embodiment, and FIG. FIG. 3 is an exploded perspective view of essential parts. 1 is a housing, 5 is a motor, 6 is a storage battery, 6
6 is a gas vent hole, 67 is a safety valve, 70 is a cap, 71 is a battery holding part, and 82 is a ventilation pipe.

Claims (1)

[Claims] 1. A rechargeable electric device comprising a storage battery having a gas vent hole at one end of a safety valve that is opened when the internal gas pressure becomes abnormally high, housed in the same housing with a sealed structure, which A cap made of an elastic material that covers the end of the storage battery in which the gas vent hole of the safety valve is opened and has a battery holding portion that is fitted around the outer periphery of the storage battery, one end of which is connected to the cap and the other end of which is exposed outside the housing. What is claimed is: 1. A rechargeable electrical device comprising: a ventilation means; the storage battery, the cap, and the ventilation means are integrally fixed to a battery holder to form a block.