JP2000215922A - Charging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively feed a large quantity of wind into a battery pack from air blowing holes of a charger without reducing the wind pressure of an appropriate wind quantity even if the kind of the battery pack is different and to effectively exhaust gaseous hydrogen generated from the battery at the same time. SOLUTION: Vent holes 10 are formed in the surface on the side where a projecting part 4 of a battery pack 2 is arranged. An exhaust hole 14 is formed in the surface on the side opposite to the surface in which the vent holes 10 of the battery pack 2 are formed. Air blowing holes 11 are formed at a position opposite to the vent holes 10 in a charger 6. A blast fan 12 for blowing wind toward the air blowing holes 11 is installed in the charger 6. A blocking device 30 that allows the wind from the blast fan 12 to be blown from the air blowing holes 11 through the vent holes 10 into the battery pack 2, and can vary the vent hole area of the air blowing holes 11 is installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery charger, and more particularly, to a battery pack used for various devices and tools, and a battery charger for charging the battery pack.

[0002]

2. Description of the Related Art Recently, nickel cadmium batteries and nickel hydrogen batteries have been widely used as storage batteries for supplying power to rechargeable electric equipment. If the battery is overcharged due to a malfunction of the battery, or if the operating pressure of the battery safety valve decreases at the end of the battery life, hydrogen gas is generated from the battery during charging, and the charging terminal When the hydrogen gas is ignited by the arc of the part, or the generated hydrogen gas accumulates in the battery pack and is attached to the equipment as it is, the hydrogen gas in the battery pack enters the equipment body, and the motors and switches in the equipment There were problems such as ignition of hydrogen gas by the arc. In particular, in a nickel-metal hydride battery, since the inside of the battery is filled with hydrogen, the above problem is likely to occur.

As a conventional example for solving this problem,
In Japanese Utility Model Publication No. 5-37634, a vent is provided in a battery pack, a blower fan is provided in a charger, and when the battery pack is mounted on the charger, hot air in the battery pack is forcibly discharged by the blower fan. It is known to have done so.

Another conventional example is disclosed in Japanese Utility Model Laid-Open No. 5-84.
Japanese Patent Publication No. 023 discloses a device in which a gas vent hole is provided in an engagement portion between a charger and a battery pack so that hydrogen gas can be released.

As another conventional example, Japanese Utility Model Laid-Open Publication No.
Japanese Patent Publication No. 209 discloses a battery pack in which holes are formed in left and right facing surfaces of a battery pack, and a fan provided in a charger blows air to the battery pack to allow air to flow inside the battery pack.

[0006]

However, in the conventional battery pack, since the area of the vent is fixed, the area of the vent does not match the area of the vent provided in the charger. In this case, the wind generated by the blower fan cannot efficiently enter the battery pack. For example, different types of battery packs, such as a 12V battery pack and one
The 5.6 V battery pack has a difference in vent area, and there is a drawback that when a battery pack having such a difference in vent area is mounted on a charger, an appropriate air volume cannot be sent to the battery pack. Also, when the charger is not in use, dust and dirt can enter the air inlet from outside and damage the blower fan.Therefore, it is necessary to provide a dustproof plate at the air outlet to prevent this. there were. Furthermore, the wind generated from the blower fan inside the charger is diffused before reaching the air outlet, and all the generated wind is
There is a drawback that the air is not discharged from the air inlet into the battery pack.

[0007] Further, depending on the characteristics of the blower fan, the generated wind is in an oblique direction corresponding to the inclination of the blades, and even after the wind enters the battery pack, the wind generated by the blower fan does not change. Batteries located in the direction of the wind will have a higher cooling effect, but batteries not located in the direction of the wind will have a lower cooling effect, so that all the batteries cannot be cooled evenly and the cooling effect of the battery pack will be reduced, Further, there is a disadvantage that the effect of discharging hydrogen gas is reduced. In order to remedy this drawback, a method is considered in which a rib is provided inside the ventilation hole of the battery pack to diffuse the wind from the blower fan, but if the surface of the rib that hits the wind is a plane perpendicular to the wind, Has a drawback in that it whirls around this vertical plane and does not provide sufficient wind power to reach the entire battery.

[0008] The present invention has been made in view of the above-mentioned conventional example, and it is possible to discharge an appropriate air flow according to the type of battery pack even if the type of the battery pack is different, and to supply an appropriate air flow from the air supply port of the charger. A large amount of wind can be efficiently sent into the battery pack without reducing the wind pressure,
An object of the present invention is to provide a charging device capable of efficiently discharging hydrogen gas generated from a battery, and enhancing a cooling effect and a gas discharging effect of the battery.Also, a plurality of batteries can be cooled evenly with a simple structure. In addition, the present invention provides a charging device that facilitates the flow of air from a blower fan to the entire area inside a battery pack, thereby cooling each battery sufficiently and uniformly, and discharging hydrogen gas without leaving any hydrogen in a short time. The purpose of the present invention is to provide a charging device that can prevent dust and dirt that hinder the driving of the blower fan from entering through the air supply port. It is an object of the present invention to provide a charging device capable of improving the cooling effect and the gas exhausting effect by improving the cooling effect and further improving the cooling effect and the gas discharging effect. Further, it is possible to diffuse the wind from the charger and reduce the wind pressure. Without an object to provide a charging device capable of obtaining a sufficient wind prevailing throughout the battery pack.

[0009]

According to the first aspect of the present invention, there is provided a battery pack having a plurality of batteries therein, the battery pack having a plurality of protruding portions provided with contact terminals on an outer surface of the battery pack. A mounting recess 9 provided with a charging terminal in the charger 6;
A charging device for charging the battery 1 by mounting the protruding portion 4 in the mounting recess 9, wherein a vent 10 is provided on a surface of the battery pack 2 on which the protruding portion 4 is provided, The exhaust port 1 is provided on the surface opposite to the surface on which the second vent 10 is provided.
4, an air supply port 11 is provided in the charger 6 at a position opposite to the ventilation port 10, and a blower fan 12 for discharging wind toward the air supply port 11 is provided in the charger 6. The air blower 12 discharges the air from the air supply port 11 to the inside of the battery pack 2 through the ventilation port 10, and further includes a shutoff device 30 capable of changing the air supply port area of the air supply port 11. With this configuration, the shutoff device 30
Battery charger 2 according to the vent area of battery pack 2
The air inlet area of the battery pack 2 can be adjusted, and an appropriate air flow according to the battery pack 2 can be discharged, so that an appropriate air flow can be supplied from the air inlet 11 of the charger 6 without reducing the wind pressure.
, The battery pack 2 can be uniformly cooled in a short time, and the gas exhaust effect can be enhanced.

According to a second aspect of the present invention, in the first aspect, a detection circuit for detecting the power of the battery pack 2 and a control device for appropriately controlling the shutoff device 30 with the detected power are provided. With this configuration, the shut-off device 3 is adapted to the area of the ventilation opening of the battery pack 2.
Adjustment of the air inlet area by 0 can be performed automatically.

According to a third aspect of the present invention, in the first or second aspect, it is preferable that the air supply port 11 can be completely shut off when the charger 6 is not used. Thus, it is possible to prevent dust and dirt that hinder the driving of the blower fan 12 from invading from the air supply port 11, and it is not necessary to use a special dustproof plate.

Further, in the invention according to claim 4, it is preferable to provide an air path changing plate 35 for changing the air path in accordance with the area of the air supply port in claim 1 or claim 2. The air generated from the blower fan 12 is
It can be prevented from being diffused inside by the airflow path changing plate 35, and even if the area of the air supply port is changed, an appropriate air volume can be reduced.
Can be discharged into.

According to a fifth aspect of the present invention, in the first aspect, it is preferable that the inner peripheral shape of the exhaust port 14 of the battery pack 2 is expanded stepwise or tapered toward the inside of the battery pack 2. With such a configuration, the air passing through the inside of the battery pack 2 through the exhaust port 14 of the battery pack 2 is well ventilated.

According to a sixth aspect of the present invention, in the first aspect, the wind is directly blown into the battery pack 2 at a position above the ventilation opening 10 of the battery pack 2 and away from the wall surface where the ventilation opening 10 is provided. It is preferable to provide a rib 13 for preventing the intrusion into the air hole and to form the rib 13 into a tapered shape toward the ventilation port 10 side. With such a configuration, the rib 13 has a tapered shape. The wind from the charger 6 is diffused and sent to the inside of the battery pack 2 without a decrease in wind pressure, so that sufficient wind power to reach the entire battery 1 is obtained.

According to a seventh aspect of the present invention, in the first aspect, the ribs 3 are arranged above the ventilation opening 10 of the battery pack 2 to divide the air into a wind that diffuses and a wind that passes without diffusion.
6 is preferably disposed, and with such a configuration, a certain battery 1 receives a reflected wind by the rib 36,
Another battery 1 receives the wind that has passed as it is, so that the entire battery 1 can be cooled more uniformly.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below.

As shown in FIGS. 1 and 2, the battery pack 2 includes a plurality of batteries 1 arranged in a battery pack case 5. As the battery 1, for example, a nickel cadmium battery or a nickel hydride battery is used. A projecting portion 4 having a contact terminal 3 is provided on the lower surface of the battery pack case 5 and a plurality of ventilation holes are provided on the lower surface where the projecting portion 4 is provided so as not to overlap with the projecting portion 4. A mouth 10 is formed. The vent 10 is provided with an air outlet 11 of the charger 6.
Is provided in correspondence with. In this embodiment, a plurality of ventilation pipes 1 penetrating vertically through the lower surface of the battery pack case 5 are provided.
0a constitutes the ventilation port 10, each ventilation port 10 has a lower end portion and a side portion opened respectively, and an upper end portion is closed,
As shown by an arrow C in FIG. 1, the wind is dispersed from the lower end of the ventilation port 10 to the side surface so that the air can flow into the battery pack case 5. In addition, the ventilation port 10 of the battery pack case 5
A plurality of exhaust ports 14 are formed on the upper surface on the opposite side to the lower surface on which is formed. The exhaust port 14 is connected to the battery 1,
1 and a gap 16 between the battery 1 and the battery pack case 5 are provided so as to face each other.
The air sent from 0 to the battery pack case 5 is discharged from the exhaust port 14 through these gaps 15 and 16.

On the other hand, the charger 6 has a mounting recess 9 opened in the upper surface of the charger case 7 and the charger case 7.
An air supply port 11 is formed on the upper surface of the battery pack case 5 at a position facing the ventilation port 10 of the battery pack case 5. In this embodiment, the charger case 7 includes an upper case 7 a and a lower case 7.
b, and a mounting recess 9 into which the protruding portion 4 of the battery pack 2 is inserted and an air supply port 11 corresponding to the vent 10 of the battery pack 2 are formed on the upper case 7a side. I have. The air supply port 11 is formed so as to vertically pass through a thick portion provided on the upper surface of the upper case 7a. The lower portion of each air supply port 11 is inclined toward the center of the discharge side of the blower fan 12 disposed below the air supply port 11,
The upper part of each air supply port 11 extends vertically in the vertical direction. The upper portion of each of the air supply ports 11 is connected to the ventilation port 1 of the battery pack 2.
0 is opposed to the lower end. With the protrusion 4 of the battery pack 2 inserted into the mounting recess 9 of the charger 6, the upper part of the air supply port 11 communicates with the lower part of the ventilation port 10, so that many The wind can be blown into the battery pack 2.

At the bottom of the lower case 7b, there are formed a plurality of intake ports 22 for sucking outside air. A screw cylinder 23 for fixing the blower fan 12 protrudes from the periphery of the plurality of intake ports 22. The blower fan 12 is disposed at a substantially middle position in the up-down direction of the charger case 7, a predetermined gap 17 is formed between the blower fan 12 and the blower opening 11, and
2, a predetermined gap 19 is formed. These gaps 17 and 19 allow the air to accumulate on both the suction side and the discharge side of the blower fan 12, thereby increasing the amount of air blown by the blower fan 12. Further, the blower fan 12 is arranged at a side position of the mounting recess 9, and the mounting recess 9 and the suction side of the blower fan 12 communicate with each other. Thereby, when hydrogen gas is generated near the charging end in the mounting recess 9, the hydrogen gas is sucked by the blower fan 12 and the battery pack 2 is discharged from the air supply port 11 and the ventilation port 10.
Can be exhausted to the outside through the exhaust port 14 of FIG.

A charging terminal 8 is arranged in the mounting recess 9, and the projecting portion 4 of the battery pack 2 is connected to the mounting recess 9.
When the battery pack 2 is inserted into the battery pack 2, the contact terminal 3 provided at the tip of the protrusion 4 contacts the charging terminal 8.
The battery 1 inside is charged. The charging circuit (heating circuit component), which is not shown, is provided in the charger case 7 at a location different from the location where the blower fan 12, the mounting recess 9 and the charging terminal 8 are located.

Here, as shown in FIGS. 1, 3 and 4,
In the case where the air from the blower fan 12 in the charger 6 is discharged from the air supply port 11 to the inside of the battery pack 2 through the ventilation port 10 of the battery pack 2, a shutoff device capable of changing the air supply port area of the air supply port 11. 30 are provided. In the present example, the opening 32 is provided on the surface of the charger 6 on the side where the air supply port 11 is provided and does not overlap with the air supply port 11, and the horizontal rib 33 protrudes from the inner surface of the charger 6. The slide plate 31 is slidably supported on the horizontal rib 33. A knob 37 is provided upright from one end of the slide plate 31, and the knob 37 projects outside through the opening 32. The knob 37 is manually movable, and can be moved from a position where the air supply port 11 is completely shut off (point a in FIG. 4) to a position where all the air supply ports 11 are opened (point b in FIG. 4). With this configuration, the air inlet area of the charger 6 can be arbitrarily adjusted in accordance with the vent area of the battery pack 2 by sliding the slide plate 31.

By inserting the projecting portion 4 of the battery pack 2 into the mounting recess 9 of the charger 6 and bringing the contact terminal 3 at the tip of the projecting portion 4 into contact with the charging terminal 8 in the mounting recess 9, Charging is started. At this time, the battery pack case 5
The vent 10 provided on the surface on which the projection 4 is formed,
The blower fan 12 in the charger case 7 is actuated to match the air supply port 11 provided on the upper surface of the charger case 7, and is indicated by an arrow A in FIG. When the outside air is sucked in the direction, the wind from the blower fan 12 is sent into the battery pack 2 from the air supply port 11 through the ventilation port 10 as shown by arrows B and C in FIG. As shown by arrows d and e, the battery pack case is cooled sufficiently after passing through the gap 15 between the batteries 1 and 1 and the gap 16 between the battery 1 and the battery pack case 5, respectively. 5 is exhausted to the outside through an exhaust port 14 provided in the upper surface portion.

Here, according to the present invention, the shutoff device 3 is connected to the charger 6.
0, and even if the air inlet area of the charger 6 does not match the air outlet area of the battery pack 2, the air inlet area can be changed according to the air outlet area of the battery pack 2. Since it is made possible, the wind generated by the blower fan 12 can be efficiently sent to the battery pack 2. That is, only by sliding the blocking plate 31 in the direction of the arrow in FIGS. 3 and 4, the air supply port area of the charger 6 can be adjusted according to the air port area of the battery pack 2. Therefore, an appropriate air volume according to the battery pack 2 can be discharged.
An appropriate air volume can be discharged from the air supply port 11 of the battery charger 6 to the ventilation port 10 of the battery pack 2 without reducing the wind pressure. Therefore, the battery pack 2 can be uniformly cooled in a short time, and the gas discharging effect can be further enhanced.

Thus, even when the nickel cadmium battery 1 or the nickel hydride battery 1 is used, in the case of the nickel cadmium battery 1, the temperature (6
(About 0 ° to 70 °), and in the case of the nickel-metal hydride battery 1, a temperature at which failure easily occurs (about 55 °)
Therefore, it is possible to reliably prevent the occurrence of a failure such as an internal short circuit or a decrease in the capacity of the battery 1 during charging, and there is no failure even when charging is performed immediately after using the battery 1 under a high load. Further, the charging is not interrupted temporarily by the temperature sensor, and the charging time is eliminated, and the charging can be performed in a short time. Further, even when hydrogen gas is generated from a battery 1 such as a nickel cadmium battery or a nickel hydride battery during charging or the like, the hydrogen gas collected near the charging terminal 8 at the source of the hydrogen gas is supplied to the blowing fan 12.
, It is possible to prevent the accumulation of hydrogen gas in the vicinity of the charging terminal 8 and the accumulation of hydrogen gas in the battery 1. It can be completely prevented and safety can be sufficiently improved.

Further, even when any one of different types of battery packs 2 (for example, a 12V battery pack 2, a 15.6V battery pack 2 or the like) is mounted on the charger 6, the shutoff device 30 can be used.
By simply sliding the knob 37 manually, the area of the air inlet of the charger 6 can be matched with the area of the air vent of the battery pack 2 and an appropriate air volume can be sent to the battery pack 2. Therefore, it is possible to easily cope with battery packs 2 of different types.

Further, when the charger 6 is not used, the air supply port 11 of the charger 6 can be completely shut off by moving the slide plate 31 to the point a in FIG. 4 (see FIG. 3). In this state, dust and dust that hinder the driving of the blower fan 12 can be prevented from entering through the air supply port 11. Moreover, since the slide plate 31 for adjusting the area of the air supply port can be effectively used to prevent dust and dirt from entering when not in use, a special dust-proof plate for closing the air supply port 11 can be provided. There is no need for installation, and cost can be reduced.

FIG. 5 shows still another embodiment, which comprises a detection circuit for detecting the power of the battery pack 2 and a control device for controlling the shutoff device 30 in accordance with the detected vent area of the battery pack 2. Shows the case where The other configuration is shown in FIG.
This is the same as the configuration in FIG. In this example, a motor 36 capable of normal and reverse rotation is used as a control device. A pinion 38 is attached to a rotating shaft of a motor 36 fixed in the charger 6, and a rack 39 is formed on the lower surface of the slide plate 31 so as to mesh with the pinion 38. Reciprocating movement is possible in the direction of increasing or decreasing the area. Here, when the battery pack 2 is mounted on the charger 6, a circuit for determining the power of the battery pack 2 (for example, the 12V battery pack 2 and the 15.6V battery pack 2) is provided, and the battery is detected based on the detected power. The vent area of the pack 2 is determined. Charger 6
A circuit that can determine the current position of the slide plate 31 is provided, the position of the slide plate 31 is determined, and the adjustment amount of the slide plate 31 is determined from these two data (the size of the vent area and the position of the slide plate 31). Is determined, and the motor 34 is driven in accordance with the adjustment amount, so that the position of the slide plate 31 can be automatically adjusted. Thereby, the charger 6
Can be adjusted to the current vent area of the battery pack 2 of a different type, and the slide plate 31
Can be automatically adjusted, and the operability is extremely improved.

FIG. 6 shows still another embodiment, in which a charger 6
Air path change plate 35 that changes the air path according to the air inlet area
Is provided. Other configurations are the same as those in FIGS. In this example, the upper end of the elastic air path changing plate 35 is attached to the tip of the slide plate 31, and the lower end of the air path changing plate 35 is located on the upper surface of the blower fan 12 near the inner wall surface of the charger 6. It is attached to the end opposite to the end. The rubber-made air path changing plate 35 is extendable and contractable in conjunction with the slide plate 31, and adjusts the air path inside the charger 6 according to the area of the air supply port. Thus, while the air inlet area can be adjusted by the slide plate 31,
The wind generated from the blower fan 12 can be prevented from being diffused inside the charger 6 by the air path changing plate 35 linked to the slide plate 31. As a result, even when the area of the ventilation hole is changed, an appropriate air volume can be reduced. It can be discharged into the pack 2.

FIGS. 7 and 8 show still another embodiment, in which the inner peripheral shape of the exhaust port 14 of the battery pack 2 is expanded stepwise or tapered toward the inside of the battery pack 2. . Other configurations are the same as those in FIG. FIG.
FIG. 8A shows a case where a tapered portion 14a is provided, and FIG.
(B) shows the case where the step portion 14b is provided. In any case, the air passing through the inside of the battery pack 2 through the exhaust port 14 is well ventilated, so that the cooling effect can be improved and the hydrogen gas discharging effect can be improved.

FIGS. 9 and 10 show still another embodiment.
Above the vent 10 of the battery pack 2,
A rib 13 for preventing the wind from directly entering the battery pack 2 at a position distant from the wall provided with the ribs, and the rib 13 is tapered toward the vent 10 side. Is shown. Here, FIG. 9 shows the 12 V battery pack 2 and FIG. 10 shows the 15.6 V battery pack 2. In FIG. 9, illustration of the shut-off device of the present invention is omitted. Other configurations are the same as those in FIG. In this example, the tip of the rib 13 is tapered, so that the wind from the charger 6 is diffused and sent into the battery pack 2 without reducing the wind pressure. In other words, since the surface of the rib 13 that is exposed to the wind does not become an inclined surface and the wind does not swirl, sufficient wind power can be obtained that reaches the entire battery 1.

FIGS. 11 and 12 show still another embodiment. In this example, in addition to the configurations shown in FIGS. 9 and 10, a rib 36 is disposed above the ventilation port 10 of the battery pack 2 to distribute the air into a wind that diffuses and a wind that passes without diffusion. Here, FIG. 11 shows the 12V battery pack 2, and FIG. 12 shows the 15.6V battery pack 2. FIG. 1
In FIG. 1, the illustration of the shut-off device of the present invention is omitted. Other configurations are the same as those in FIG. In this example, as shown in FIG. 11, the rib 36 rises upward from between two adjacent ventilation ports 10, and a side surface on one side of the rib 36 receives wind from one ventilation port 10. An inclined surface 36a that allows the light to pass as it is in the oblique direction is formed, and a reflection surface 36b that reflects the wind from the other ventilation port 10 is formed on the other side surface. As a result, the ribs 3
The other batteries receive the wind reflected by the wind reflected by 6, so that the entire battery 1 can be cooled more uniformly.

[0032]

As described above, according to the first aspect of the present invention, the battery pack in which a plurality of batteries are housed is provided with a protruding portion provided with a contact terminal on the outer surface to charge the charger. A charging device for charging a battery by providing a mounting recess provided with terminals and mounting the protruding portion in the mounting recess, wherein a vent is provided on a surface on a side where the protruding portion of the battery pack is provided. An exhaust port is provided on a surface of the battery pack opposite to the surface on which the vent is provided, and an air vent is provided at a position opposite to the vent in the charger, and air is discharged toward the air vent in the charger. Since a blower fan is provided, and the air from the blower fan is discharged from the air supply port to the inside of the battery pack through the ventilation port, and a shutoff device that can change the air supply area of the air supply port is provided, A battery shut-off device allows the charger to fit into the vent area of the battery pack. Since the vent area can be adjusted and an appropriate air flow according to the battery pack can be discharged, an appropriate air flow can be discharged from the air inlet of the battery charger to the vent of the battery pack without reducing the wind pressure. The pack can be uniformly cooled in a short time, and the gas discharging effect can be further enhanced.

According to a second aspect of the present invention, in addition to the effects of the first aspect, there is provided a detection circuit for detecting the power of the battery pack, and a control device for appropriately controlling the cutoff device based on the detected power. Therefore, it is possible to automatically adjust the air outlet area by the shutoff device in accordance with the air vent area of the battery pack, thereby improving operability and eliminating adjustment errors.

According to the third aspect of the present invention, in addition to the effects of the first and second aspects, the air supply port can be completely shut off when the charger is not used. It is possible to prevent dust and dirt that hinder driving from entering through the air supply port, and it is not necessary to install a special dust-proof plate for closing the air supply port, so that the cost can be reduced.

According to a fourth aspect of the present invention, in addition to the effect of the first or second aspect, an air path changing plate for changing an air path according to an air supply port area is provided. The generated wind can be prevented from being diffused inside the charger by the airflow path changing plate, and an appropriate air volume can be discharged into the battery pack even when the air supply opening area changes.

According to the fifth aspect of the present invention, in addition to the effect of the first aspect, the inner peripheral shape of the exhaust port of the battery pack is expanded stepwise or tapered toward the inside of the battery pack. The air flowing through the inside of the battery pack through the exhaust port of the battery pack is well ventilated, so that the cooling effect can be improved and the hydrogen gas discharging effect can also be improved.

According to a sixth aspect of the present invention, in addition to the effect of the first aspect, the air conditioner is provided above the vent of the battery pack,
A rib is provided at a position distant from the wall surface where the vent is provided to prevent wind from directly entering the battery pack, and this rib is tapered toward the vent so that it is tapered. The wind from the charger is diffused by the ribs of the shape, and is sent into the inside of the battery pack without reducing the wind pressure, so that sufficient wind power can be obtained to reach the entire battery.

According to a seventh aspect of the present invention, in addition to the effect of the first aspect, a rib is provided above the ventilation opening of the battery pack to distribute the air into a wind that diffuses and a wind that passes without diffusion. As a result, one battery receives the wind reflected by the ribs, and the other battery receives the wind that has passed through as it is, so that the entire battery can be cooled more uniformly.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an embodiment of the present invention.

FIG. 2 (a) is a top view of the same charger case, and FIG. 2 (b).
Is a bottom view.

FIG. 3 is a cross-sectional view illustrating the shutoff device according to the first embodiment.

FIG. 4 is a cross-sectional view illustrating a state where the blocking device is opened.

FIG. 5 is a sectional view of another embodiment.

FIG. 6 is a sectional view of still another embodiment.

FIG. 7 is a sectional view of still another embodiment.

FIG. 8A is an explanatory diagram in a case where an exhaust port has a tapered shape,
(B) is an explanatory view in the case where the exhaust port is stepped.

FIG. 9 is a sectional view of a 12V battery pack according to still another embodiment.

FIG. 10 is a cross-sectional view of a 15.6V battery pack showing still another embodiment.

FIG. 11 is a sectional view of a 12V battery pack according to still another embodiment.

FIG. 12 is a cross-sectional view of a 15.6V battery pack showing still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 Battery pack 3 Contact terminal 4 Projection part 6 Charger 8 Charging terminal 9 Mounting concave part 10 Vent 11 Air supply vent 12 Ventilation fan 13 Rib 14 Exhaust vent 30 Cutoff device 35 Air flow path change plate 36 Rib

Claims (7)

[Claims] 1. A battery pack containing a plurality of batteries, a protrusion having a contact terminal is provided on an outer surface of the battery pack, a mounting recess having a charging terminal is provided in a charger, and the protrusion is mounted in the mounting recess. A charging device for charging the battery by providing a vent on the surface on which the protruding portion of the battery pack is provided, and an exhaust port on a surface opposite to the surface on which the vent of the battery pack is provided. Provided, an air supply port is provided at a position opposite to the ventilation port in the charger, and a blower fan that discharges wind toward the air supply port is provided in the charger, and wind from the blower fan is supplied from the air supply port. A charging device, characterized in that a charging device is provided, which is capable of discharging into the battery pack through a ventilation hole and changing an air supply port area of the air supply port. 2. The charging device according to claim 1, further comprising a detection circuit for detecting the power of the battery pack, and a control device for appropriately controlling the cutoff device based on the detected power. 3. The charging device according to claim 1, wherein the air supply port can be completely shut off when the charger is not used. 4. The charging device according to claim 1, further comprising an air path changing plate for changing an air path according to an area of the air supply port. 5. The charging device according to claim 1, wherein the inner peripheral shape of the exhaust port of the battery pack is expanded stepwise or tapered toward the inside of the battery pack. 6. A rib for preventing wind from directly entering the battery pack at a position above the ventilation hole of the battery pack and away from the wall surface provided with the ventilation hole, and 2. The charging device according to claim 1, wherein the rib is tapered toward the vent. 7. The charging device according to claim 1, further comprising a rib disposed above the ventilation opening of the battery pack, the rib dividing the air into a wind that diffuses and a wind that passes without being diffused.