JP3113655B1 - Battery pack - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To surely prevent short-circuiting of both a charging terminal and a discharging terminal by using it simply and conveniently. The battery pack is discharged without lowering the output voltage, and is surely charged. A battery pack is mounted in a battery storage section 2 of an electric device 1. The battery pack has a discharge terminal 10 connected to the contact of the battery housing 2 and a charging terminal 22 for charging separately and independently. The charging terminal 22 is connected to the battery via a diode 54 in the direction in which the charging current flows, and the discharging terminal 10 is turned on when the battery pack is inserted into the battery housing 2 and turned off when the battery pack is removed from the battery housing 2.
1 connected to the battery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rechargeable battery pack which is mounted in a battery compartment of an electric device instead of a dry battery.

[0002]

2. Description of the Related Art Electric equipment can be used economically by repeatedly charging and discharging many times by using a rechargeable battery pack instead of a dry cell. In particular, like a game console,
Electric equipment with a long usage time and a huge amount of usage,
There is a feature that the amount of discarded dry batteries can be significantly reduced by replacing the dry batteries with the pack batteries. A battery pack used in place of a dry cell needs to be provided with a dedicated charging terminal. This is because the electric device to which the battery pack is mounted is not designed to be able to charge the battery to be mounted in the battery housing.

In a battery pack having both a discharging terminal and a charging terminal, a large short-circuit current flows through the battery when the charging terminal or the discharging terminal comes into contact with a metal or the like when the battery is taken out of an electric device. A battery pack that exposes both the charge terminal and the discharge terminal to the outside has two drawbacks, one on the + side and the other on the minus side. is there. When the battery is short-circuited, the current is extremely large and degrades the performance of the battery. further,
The heat generated by the large current is considerably large, and there is also a problem of being locally heated. In particular, the charging terminal is provided at a place where short-circuiting is likely, such as being provided on the back of the battery pack so that the battery can be charged from the outside while the battery pack is mounted on the electric device.

[0004] A short circuit caused by the contact of the charging terminal with a metal or the like can be prevented by connecting the battery to the charging terminal via a diode, as described in, for example, Japanese Utility Model Application Laid-Open No. 62-57372. In this battery pack, a diode is connected in a direction in which the battery is charged, and a current in a direction in which the battery is discharged is cut off to prevent a short circuit.

[0005]

A battery pack in which a diode is connected to a charging terminal can prevent a short circuit in which a metal or the like contacts the charging terminal. However, since the diode is connected between one charging terminal and the battery,
A short-circuit current cannot be prevented from flowing through the battery when the metal contacts the pair of discharge terminals or the metal contacts one of the charge terminals to which no diode is connected and the discharge terminal. For this reason, a battery pack in which a diode is connected to one of the charging terminals cannot prevent a short circuit when a metal contacts the charging terminal to which the diode is not connected and the discharging terminal.

[0006] In order to prevent short-circuiting of a battery pack taken out of an electric device, the battery is housed in a dedicated insulating case. Put the battery pack in an insulating case,
Both the discharging terminal and the charging terminal can be insulated to prevent a short circuit. Since the insulating case is not used when the battery pack is mounted on the electric device, it is difficult to store the insulating case so as not to lose it. Therefore, it is actually very difficult for all users to put the battery pack in the insulating case. For this reason, it is extremely difficult to reliably prevent short-circuiting of both the discharge terminal and the charge terminal using the insulating case.

[0007] The present invention has been developed to solve these disadvantages, and an important object of the present invention is to use a simple and convenient method to short-circuit both the charging terminal and the discharging terminal. It is to provide a battery pack that can be reliably prevented.

Another important object of the present invention is to provide a battery pack that discharges the battery pack without lowering the output voltage and can reliably charge the battery pack.

[0009]

The battery pack of the present invention comprises:
It is attached to the battery storage section 2 of the electric device 1. The battery pack includes a discharge terminal 10 connected to a contact of the battery storage unit 2 ,
A diode 54 connected between the charging terminal 22 and the electrode terminal 5 of the secondary battery 3 in a direction in which a charging current flows ;
Connected between terminal 10 and electrode terminal 5 of secondary battery 3
A switch 21. Switch 21, when mounting the battery pack in the battery housing section 2 on, and set to be off when removed from the battery compartment 2.

[0010] The battery pack according to claim 2 of the present invention is a secondary battery.
The electrode terminal side of the pond 3 is branched into two and connected to the discharge terminal 10 and the charge terminal 22. One branch is connected to the discharge terminal 10 via the switch 21, and the other branch connected to this branch is connected to the charge terminal 2 via the diode 54.
2 connected.

According to the third aspect of the present invention, there is provided a battery pack comprising:
A discharging terminal 10 connected to the contact of the housing 2 and a charging terminal for charging;
Connected to the charging terminal 22 and the charging terminal 22 and the discharging terminal 10.
Between the branch point and the electrode terminal 5 of the secondary battery 3
And a switch 21. The switch 21 is turned on when the battery pack is mounted in the battery storage section 2 and turned off when the battery pack is removed from the battery storage section 2. When the battery pack is removed from the battery storage section 2, the switch 21 is connected to the charging terminal 22 and the discharging terminal 10.
Are electrically disconnected from the secondary battery 3 .

In the battery pack according to a fourth aspect of the present invention, the battery pack includes a plurality of secondary batteries 3 and electrode ends of the plurality of secondary batteries 3.
And a switch 21 connected between the terminals 5. Sui
Pitch 21 is turned in a state of being attached to the battery compartment 2, in a state of being taken out from the battery housing section 2 are <br/> in so that such off.

A battery pack according to a fifth aspect of the present invention includes a plurality of cylindrical batteries arranged in parallel with each other. The switch 21 is provided in the valley between the cylindrical batteries.

According to a sixth aspect of the present invention, a battery pack includes a plurality of secondary batteries 3 connected in series to each other.
The secondary batteries 3 are connected in series with each other via an overcurrent protection element 53. Further, the battery pack according to claim 7 of the present invention.
Means that the switch 21 is provided on the opening / closing lid of the battery housing 2.
It is pushed by the protrusion and turned on.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below illustrate a battery pack for embodying the technical idea of the present invention, and the present invention does not specify the battery pack as follows.

Further, in this specification, in order to make it easier to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as "claims" and "claims". In the column of “means”.
However, the members described in the claims are not limited to the members of the embodiments.

1 and 2 show perspective views of a battery pack.
FIG. 3 shows a circuit diagram of the battery pack shown in FIG.
FIG. 2 is a perspective view showing a state in which the battery pack shown in FIG. 1 is viewed from the lower rear side. The battery pack shown in these figures is
The battery is mounted in the battery storage section 2 of the electric device 1 shown in FIG. The electric device 1 in FIG. 4 is a game machine. However, the present invention does not specify an electric device to which a battery pack is mounted as a game machine.

The battery storage section 2 of the electric device 1 shown in FIG.
Insert the batteries in +-reverse direction. Therefore, the battery housing portion 2 is provided with the elastic projecting contacts 6 so as to be located on diagonal lines at both ends. The elastic projecting contact 6 is formed by winding an elastic wire in a coil shape, and is elastically pressed against the negative electrode terminal of the dry battery to make electrical contact therewith. Although not shown, the elastic projecting contact may have a shape in which the elastic metal plate elastically projects toward the dry battery. The battery housing 2 is provided with an elastic projecting contact 6
Next to the non-elastic contact 7 that contacts the positive electrode terminal of the dry cell
Is fixed. The non-elastic contact 7 is also disposed on a diagonal line of the battery housing 2. The non-elastic contact 7 has a metal plate fixed to the inner surface of the battery housing 2. The elastic projecting contact 6 is provided on the battery housing 2 so as to project beyond the non-elastic contact 7.

In the battery accommodating section 2 shown in FIG. 4, an elastic projecting contact 6 and a non-elastic contact 7 provided on the right side are connected by a lead plate 8. This is for connecting the dry batteries mounted adjacent to the battery storage section 2 in series. In the figure, the elastic projecting contact 6 and the inelastic contact 7 provided on the left side of the battery housing 2 are
The power supply terminal of the electric device 1 supplies power to the electric device 1.

The battery pack is electrically connected to the left elastic projecting contact 6 and the non-elastic contact 7 to supply electric power to the electric device 1. In the battery pack shown in FIG. 3, the right side of the built-in secondary battery 3 is connected in series via an overcurrent protection element 53. The overcurrent protection element 53 is connected in series with the battery, and prevents an excessive current from flowing through the battery. As the overcurrent protection element 53, a PTC element whose electric resistance sharply increases when an excessive current flows through the battery, or a fuse or a breaker that cuts off the current when an excessive current flows, can be used.

In the above-described battery pack, the positive and negative electrode terminals 5 on the right side of the secondary battery 3 are electrically connected to the elastic projecting contacts 6 and the non-elastic contacts 7 provided on the right side of the battery housing 2. Without this, power can be supplied to the electric device 1. Therefore,
In the battery pack, it is not necessary to bring the opposite side of the discharge terminal 10 into contact with the elastic projecting contact 6 and the non-elastic contact 7 of the battery housing 2.

In the battery packs shown in FIGS. 1 and 2, two secondary batteries 3 are connected in parallel by a holder 4 and fixed. The secondary battery 3 is fixed to the holder 4 with the positive discharge terminal 10A protruding from the negative discharge terminal 10B. The secondary battery 3 is a cylindrical rechargeable battery, for example, a nickel-cadmium battery, a nickel-hydrogen battery, a lithium ion secondary battery, or the like. The secondary battery 3 has substantially the same thickness as the dry battery mounted in the battery storage section 2 or is slightly thinner. Further, the overall length of the secondary battery 3 is slightly shorter than that of the dry battery.

The battery pack set in the battery compartment 2 designed to mount AA dry batteries is substantially the same as or slightly thinner than AA batteries, and is somewhat shorter than AA batteries. The secondary battery 3 has a built-in shape. The illustrated battery pack contains two rechargeable batteries 3,
The battery pack may include three or more secondary batteries.

The total length of the battery pack is set at the minimum distance between the two elastic projecting contacts 6 disposed at both ends of the battery housing 2 so as to be opposed to each other, that is, in a state where the elastic projecting contacts 6 are not compressed. Is longer than the interval between the end faces of the resilient projecting contacts 6 disposed opposite to each other. The total length of the battery pack is
If the distance is shorter than the minimum distance between the elastic projecting contacts 6, the + and − discharge terminals 10 cannot be electrically connected to the elastic projecting contacts 6 and the inelastic contacts 7 serving as power terminals of the electric device 1.

Further, in the battery pack, as shown in FIGS. 5 to 7, two secondary batteries 3 are connected and fixed by a holder 4 so that the + and-polarities are reversed.
The battery pack is connected to the + -electrode terminal 5 of the adjacent secondary battery 3.
Are connected in series on the opposite side of the discharge terminal 10 by a lead plate 9.

In the battery pack shown in the figure, a positive discharge terminal 10A connected to the non-elastic contact 7 of the battery housing 2 is elastically pushed out toward the non-elastic contact 7 of the battery housing 2. 17 is set. The elastic discharge terminal 17 is shown in the sectional views of FIG. 5 and FIG. The elastic discharge terminal 1 in these figures
7, the metal cap 18 is attached to the non-elastic contact 7 of the battery housing 2.
And is pushed out by a spring 19. Metal cap 1
Numeral 8 is a metal plate formed by press molding. The central portion is protruded to form a convex terminal 18A, and the periphery thereof is a stopper flange 18B. The metal cap 18 is pushed by a spring 19 to elastically project the convex terminal 18A to the outside from a through hole provided in the holder 4. Stopper collar 18B
Abuts against the inner surface of the holder 4 which is the outer periphery of the through hole,
The metal cap 18 is prevented from jumping out of the holder 4.

The spring 19 is a coil spring made of an elastic metal wire, and is disposed between the positive electrode terminal 5 of the secondary battery 3 and the metal cap 18 to elastically push the metal cap 18. An insulating material 20 is sandwiched between the spring 19 and the electrode terminal 5 so that the spring 19 does not electrically contact the positive electrode terminal 5 of the secondary battery 3. The spring 19 is also used for a lead plate connecting the metal cap 18 to the secondary battery 3. The spring 19 is connected to the secondary battery 3 via the switch 21.

As shown in the circuit diagram of FIG.
A switch 21 is connected between the discharge terminal 10 and the secondary battery 3. The switch 21 is turned on when the battery pack is installed in the battery compartment and can be used, and turned off when the battery pack is removed from the battery compartment.

As shown in the cross-sectional views of FIGS. 5 and 6, the switch 21 is turned on by being pushed by a protruding portion (not shown) provided on the opening / closing lid of the battery housing. This switch 2
A switch 1 has an elastic contact 21A and a fixed contact 21B, and pushes the elastic contact 21A in the direction of the arrow in FIG.
Turn 1 on. Therefore, when the battery pack is mounted in the battery storage unit and the open / close lid is closed, the switch 21 is turned on, and the electric device can be supplied with power. When the battery pack is removed from the electric device, the elastic contact 21A is no longer pressed, and the switch 21 is turned off. Therefore, when the battery pack is removed from the electric device, no short-circuit current flows through the secondary battery 3 even if the discharge terminal 10 is short-circuited.

Further, the battery pack shown in the figure has an elastic contact 21 A of the switch 21 and a spring 19 of the elastic discharge terminal 17.
Are composed of one elastic wire. One end of the elastic wire is processed into a coiled shape to form a spring 19 for pushing out the metal cap 18, and the other end is extended to a position facing the fixed contact 21 </ b> B to form an elastic contact 21 </ b> A of the switch 21. The elastic wire composed of the spring 19 and the elastic contact 21A is provided while being held at a fixed position by the holder 4.

In the battery pack having the above structure, the switch 21 is turned on by the open / close lid. The switch 21 may be configured to be switched to the ON position by pressing the switch 21 with a rib provided in the battery storage unit, for example, without using the open / close lid. In this switch, an elastic contact is disposed at a position where the elastic contact is pressed by a rib, and a fixed contact is disposed at a position where the pressed elastic contact contacts.

The battery pack is provided with a charging terminal 22 separately from the discharging terminal 10. The charging terminal 22 is connected to the secondary battery 3 via the diode 54 without passing through the switch 21. The charging terminals 22 are fixed to the holder 4 in parallel with the back surface of the battery pack. The diode 54 is connected in the direction in which the charging current flows. The discharging current is in the opposite direction to the charging current, and the discharging current is cut off by the diode 54. Therefore, even if a metal or the like contacts the pair of charging terminals, no short-circuit current flows through the battery.

The battery pack shown in the circuit diagram of Figure 3, secondary battery
The positive electrode terminal of the pond 3 is branched into two and connected to the discharging terminal 10 and the charging terminal 22, and one branch is connected to the discharging terminal 10 via the switch 21 and connected to this branch. The other branch is connected to the charging terminal 22 via a diode 54. However, the diode 54 and the switch 21
Can be connected to the electrode terminal side where + and-are different.
In the battery pack of FIG. 8, the switch is connected to the + side discharge terminal 10A, and the diode 54 is connected to the − side charge terminal 22.

The battery pack shown in FIG. 3 and FIG.
The switch 21 prevents a short circuit due to the contact of metal with the discharge terminal 10. However, a short circuit at both the charging terminal and the discharging terminal can be prevented by a switch. FIG. 9 shows a circuit diagram of a battery pack for realizing this. In the battery pack shown in this figure, the branch point connected to the charging terminal 22 and the discharging terminal 10 is connected to the electrode terminal of the secondary battery 3 via a single switch 21. The switch 21 is turned on when the battery pack is mounted in the battery housing and put into use, and turned off when the battery is removed from the battery housing. In the battery pack of this figure, the switch 21 is connected to the positive electrode terminal of the secondary battery 3 to branch into the charging terminal 22 and the discharging terminal 10, but the switch is connected to the negative electrode terminal of the secondary battery. Then, it can also be branched into a charging terminal and a discharging terminal. Further, although not shown, a plurality of secondary batteries 3
Can be connected in series with a secondary battery 3 via a switch 21 as shown in FIG.

In the battery pack shown in FIG. 3, the switch 21 is connected to the positive electrode terminal of the secondary battery 3, but the switch can be connected to the negative electrode terminal. Further, FIG.
6 show a cross section of a battery pack in which the switch 21 is connected to the positive electrode terminal of the secondary battery. The switch has the structure shown in FIG. 5 and FIG.
Alternatively, as shown in FIG. 10, a plurality of secondary batteries 3 can be connected to a position where they are connected in series. Further, the battery pack shown in the figure is switched on by being pushed by the protrusion of the opening / closing lid, but the switch is pushed by the partition rib provided in the battery accommodation part with the battery pack attached to the battery accommodation part. It is also possible to adopt a structure that is turned on after being turned on. This switch can also be arranged in the valley of the cylindrical battery, and can be configured to be pushed by the rib of the partition wall. The partition rib that turns on by pressing the switch has a protrusion at the position where the switch is pressed,
Now switch it on by pressing the switch.

The battery pack is charged in a state where the battery pack is mounted in the battery storage section 2 or is removed from the electric device 1 and charged. In order to charge the battery pack, the holder 4 has a charging window 23 at a position facing the charging terminal 22. Further, in a state where the battery pack is mounted in the battery storage unit 2, the protrusion of the opening / closing lid is inserted into the battery pack so that the elastic contact 21A of the switch 21 can be pressed.
As shown in FIG. 7, a switch window 24 is opened at a position where the elastic contact 21A is pressed.

The holder 4 includes a holder plate 11 and an insulating holder 12, as shown in FIGS. The holder plate 11 is a metal plate that can be elastically deformed,
For example, it is manufactured by processing a stainless steel plate or the like. The holder plate 11 is formed by processing a metal plate into a groove shape capable of holding two rechargeable batteries 3 in parallel and holding both side walls along the surface of the cylindrical rechargeable battery 3. The holder plate 11 of this structure is made extremely thin,
Can be reliably held in a state of elastically pressing. For this reason, in the battery pack that holds the secondary battery 3 with the metal plate holder plate 11, the built-in secondary battery 3 can be made almost the same thickness as the dry battery mounted in the battery storage unit 2. This is because the holder plate 11 does not increase the substantial thickness of the secondary battery 3. Therefore, in the battery pack having this structure, the charging capacity can be increased by using the thick secondary battery 3. The metallic holder plate 11 holds and connects the secondary batteries 3 covered with an insulating material such as a heat-shrinkable film.

The insulating holder 12 is formed by molding an insulating material such as plastic, and includes an end cover portion 12A provided at the end of the secondary battery 3 and a plate portion provided on the inner surface of the holder plate 11. 12B. The end cover portion 12A is provided with a discharge terminal cover portion 12a on the discharge terminal 10 side.
And a bottom cover part 12b.

The bottom cover 12b is provided with two rechargeable batteries 3
Are connected on the inner surface. Further, the bottom cover portion 12b has a slit, and the slit forms a guide groove 13 for guiding the elastic projecting contact 6 of the battery housing portion 2. The guide groove 13 is provided at a position facing the negative electrode terminal 5 of the built-in secondary battery 3. In the illustrated bottom cover portion 12b, since the guide groove 13 is formed by a slit, the negative electrode terminal surface of the secondary battery 3 is the bottom surface of the guide groove 13. The guide groove 13 formed by a slit is provided to extend from the center of the negative electrode terminal 5 of the secondary battery 3 to the bottom surface of the battery housing 2. This is because the elastic projecting contact 6 is moved along the guide groove 13 when the battery pack is inserted into the battery housing 2. -Of the secondary battery 3
The battery pack having the electrode terminal surface as the bottom surface of the guide groove 13 is:
The guide groove 13 can be deepened. The battery pack of this structure is
A part of the negative electrode terminal of one of the secondary batteries is exposed to the outside. However, even if a metal comes into contact with this terminal and the discharging terminal or charging terminal on the positive side, the battery does not short-circuit. that is,
This is because the positive electrode terminal of this secondary battery is connected to the discharging terminal via a switch, and is connected to the charging terminal via a diode in the opposite direction.

In a battery pack in which secondary batteries are connected in series inside the bottom cover, the positive and negative electrode terminals of the secondary battery provided inside the bottom cover are connected to the elastic projecting contacts of the battery housing. Since there is no need to make contact with the inelastic contact, a guide groove having a bottom can be formed in the bottom cover.

The depth of the guide groove 13 is preferably set such that the battery pack is mounted on the battery
The elastic projecting contact 6 has such a depth that the bottom of the guide groove 13 is not elastically pressed. The battery pack having this structure can be most easily inserted into the battery housing 2. That is, the elastic projecting contact 6 disposed opposite the bottom cover portion 12b is
This is because the pack battery can be mounted in the battery storage section 2 without any compression.

The battery pack shown in FIG.
A guide groove 13 is provided at one end from the center of b. The guide groove 13 does not necessarily need to be provided on both upper and lower surfaces of the battery pack. Pack battery in battery compartment 2
When the elastic projecting contact 6 is in the home position,
This is because the electrode terminal 5 is located substantially at the center.

Further, as shown in FIGS. 2 and 6, the battery pack is provided with an inclined surface 45 below the bottom cover portion 12b so that it can be easily inserted into the battery housing portion 2. In FIG. 4, the battery pack is inserted in a state where the elastic projecting contact 6 located on the left side of the battery housing 2 is pressed and compressed by the discharge terminal 10 of the battery pack. At this time, since the inclined surface 45 is provided at the lower portion of the bottom cover portion 12b located on the right side, the battery pack has a feature that it can be inserted smoothly without contacting the opening edge of the battery housing portion 2.

Further, the battery pack shown in the figure has a bottom cover 1 so that it can be easily pulled out from the battery housing 2.
A handle recess 14 is provided in 2b. The handle recess 14 is provided at the center of the bottom cover 12b. In the battery pack shown in the figure, convex portions are provided on both sides of the bottom cover portion 12b, and the portions between the convex portions are thinly formed as handle concave portions 14. A slit is provided in a portion where the handle concave portion 14 is provided and formed thin, and this is used as the guide groove 13.

The battery pack has a built-in secondary battery 3 shorter than a dry battery mounted in the battery housing 2. This is because the handle recess 14 is provided in the holder 4 to provide a gap between the holder 4 and the inner surface of the battery housing 2.

Further, the battery pack is provided on the holder plate 11 with a reverse insertion preventing projection 41 for preventing the battery pack from being inserted into the battery housing 2 in the opposite direction. In the illustrated battery pack, a reverse entry prevention projection 41 is provided so as to protrude from one side surface of the battery pack. When the battery pack is inserted into the battery housing 2 in a normal direction, the battery pack guides the reverse entry prevention projection 41 into the gap of the battery housing 2. However, when the battery pack is inserted into the battery housing 2 in the reverse direction, the reverse insertion preventing projection 4
1 hits the inner surface of the battery storage section 2 so that the battery pack cannot be mounted. The battery housing 2 shown in FIG. 4 guides the battery pack reverse entry prevention projection 41 to a hook space 42 for guiding the hook of the opening / closing lid so that the battery pack can be mounted in a normal direction.

The structure for preventing the battery pack from being inserted in the opposite direction can also be realized by the partition ribs 43 provided in the battery housing 2. The partition ribs 43 are disposed between the two batteries and set the batteries in place in parallel. The partition ribs 43 have an asymmetric height on the left and right, and form a valley space between the two secondary batteries 3 so that the asymmetric partition ribs 43 can be fitted.

[0048]

The battery pack according to the first aspect of the present invention has a feature that it can be conveniently used and can reliably prevent both the charging terminal and the discharging terminal from being short-circuited. That is, the battery pack of the present invention has a charging terminal connected to the battery via a diode, a discharging terminal connected to the battery via a switch, and the switch is turned on when the battery pack is mounted in the battery housing. This is because a switch that is turned off when the battery is removed from the battery storage unit is used. The battery pack of the present invention is characterized in that the charging terminal is connected to the battery via a diode instead of a switch, and the discharging terminal is connected to the battery via a switch. Rather than connecting both the charging and discharging terminals to the battery with switches. The battery pack having this structure can be used extremely conveniently in an ideal state. This is because the battery can be reliably charged and electric equipment can be efficiently supplied with power from the battery.

The diode connected to the charging terminal does not have a mechanical contact, so that a contact failure does not occur. For this reason, the charging terminal should always be able to charge the battery,
When the charging terminal is connected to the charger, the battery is reliably charged. Poor contact during charging is difficult to discriminate, making the use of the battery extremely inconvenient, but diodes do not cause insufficient charging due to poor contact. However, a diode has a disadvantage that a voltage drop is larger than a switch.
However, the voltage drop of the diode can increase the output voltage of the charger and charge the battery without any problem.

The switch connected to the discharge terminal may cause a contact failure, but has a very small voltage drop. If the switch causes a contact failure, the electrical equipment cannot be used, so it can be immediately identified. Since the switch has a very small voltage drop and is almost negligible, the power output from the battery pack can be supplied to the electric equipment in the most effective manner. As described above, the battery pack of claim 1 of the present invention
There is a feature that the charging terminal and the discharging terminal can be reliably prevented from short-circuiting due to contact with metal or the like while being used in an ideal state.

According to the third and fourth aspects of the present invention, both the charging terminal and the discharging terminal are connected to the battery through a single switch. Switches can cause poor contact as described above. However, in this battery pack, the charging terminal and the discharging terminal are not connected to the battery through separate switches, but are connected to the battery through the same switch. Therefore, the contact failure of the switch can be reliably determined when the battery pack is being discharged. Poor switch contact does not occur only when charging the battery. Switches that cause poor contact occur both during charging and during discharging. Therefore, the battery pack can charge the battery pack while checking for poor contact with the switch during discharging, and thus has the advantage of being able to reliably charge the battery pack.

[Brief description of the drawings]

FIG. 1 is a perspective view of a battery pack according to an embodiment of the present invention.

FIG. 2 is a rear perspective view of the battery pack shown in FIG. 1;

FIG. 3 is a circuit diagram of a battery pack according to an embodiment of the present invention.

FIG. 4 is a front view showing a state in which a battery pack is mounted in a battery storage section of the electric device.

FIG. 5 is a horizontal sectional view of the battery pack shown in FIG. 1;

FIG. 6 is a longitudinal sectional view of the battery pack shown in FIG. 1;

7 is a cross-sectional view of the battery pack shown in FIG.

FIG. 8 is a circuit diagram of a battery pack according to another embodiment of the present invention.

FIG. 9 is a circuit diagram of a battery pack according to another embodiment of the present invention.

FIG. 10 is a circuit diagram of a battery pack according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric equipment 2 ... Battery accommodating part 3 ... Secondary battery 4 ... Holder 5 ... Electrode terminal 6 ... Elastically protruding contact 7 ... Inelastic contact 8 ... Lead plate 9 ... Lead plate 10 ... Discharge terminal 10A ... + side discharge terminal
10B ...- side discharge terminal 11 ... Holder plate 12 ... Insulating holder 12A ... End cover
12B: Plate portion 12a: Discharge terminal cover portion 12b: Bottom cover portion 13: Guide groove 14: Handle concave portion 17: Elastic discharge terminal 18: Metal cap 18A: Convex terminal
18B: stopper flange 19: spring 20: insulating material 21: switch 21A: elastic contact
21B ... fixed contact 22 ... charging terminal 23 ... charging window 24 ... switch window 41 ... reverse entry prevention projection 42 ... hook space 43 ... partition ribs 45 ... inclined surface 53 ... overcurrent protection element 54 ... diode

Claims (7)

(57) [Claims] 1. A battery pack mounted in a battery storage section (2) of an electric device (1), comprising: a discharge terminal (10) connected to a contact of the battery storage section (2); Terminal (22) and charging end
A diode (54) connected in a direction in which a charging current flows between the terminal (22) and the electrode terminal (5) of the secondary battery (3); and a discharge terminal.
(10) and the electrode terminal (5) of the secondary battery (3).
And a switch (21), the switch (21), I when mounting the battery pack in the battery compartment (2) on and is Eject from the battery housing section (2) off the
A battery pack that can be used . 2. The secondary battery (3) has an electrode terminal side which is branched into two and connected to a discharging terminal (10) and a charging terminal (22), and one branch is discharged through a switch (21). The battery pack according to claim 1, wherein the battery is connected to the terminal (10), and the other branch connected to the branch is connected to the charging terminal (22) via a diode (54). 3. A battery pack mounted in a battery storage section (2) of an electric device (1), comprising: a discharge terminal (10) connected to a contact of the battery storage section (2); Terminal (22) and charging terminal
(22) and the junction connected to the discharge terminal (10) and the secondary battery
The switch (21) connected between the electrode terminal (5) of (3) and
The switch (21) is turned on when the battery pack is installed in the battery compartment (2), turned off when the battery is removed from the battery compartment (2),
When the battery pack is removed from the battery compartment (2), both the charging terminal (22) and the discharging terminal (10) are connected to the secondary battery (3).
A battery pack that is electrically disconnected from the battery. 4. A battery pack mounted in a battery compartment (2) of an electric device (1) , comprising a plurality of secondary batteries (3) and a discharge connected to a contact of the battery compartment (2). Between the terminal (10), the charging terminal (22) for charging, and the electrode terminals (5) of the plurality of secondary batteries (3).
A switch (21) connected to the battery compartment (2), and is turned on when the switch (21) is attached to the battery compartment (2) and off when the switch (21) is removed from the battery compartment (2).
Rupa click the battery. 5. incorporates a plurality of cylindrical battery formed by arranged parallel to one another, claim the valley between the cylindrical batteries are <br/> disposed switch (21) 1,3, 4. The battery pack according to any one of 4. 6. each other a plurality of secondary batteries connected in series to the doctor
(3) incorporates a secondary battery (3) is over-current protection device (53)
The battery pack according to any one of claims 1, 3, and 4, wherein the battery packs are connected to each other in series via a wire. 7. A switch (21) for opening and closing the battery housing (2).
A claim that can be turned on by being pushed by a protrusion provided on the lid
Item 6. The battery pack according to any one of Items 1, 3, and 4.