JPH07245095A - Removable type battery unit - Google Patents

Abstract

PURPOSE:To secure safety of a battery even when a battery pack is removed from a circuit pack. CONSTITUTION:A switch 32 is provided in series with a battery 31 in a battery pack 11 in such a way that the switch 32 is put on when a circuit pack 12 is installed on the battery pack 11, and that the switch 32 is put off when the battery pack 11 is removed from the circuit pack 12. In this constitution, the battery 31 can be charged/discharged while the battery pack 11 is installed on the circuit pack 12, but when the battery pack 11 is removed from the circuit pack 12, the voltage of the battery 31 is disconnected by the switch 32 to be prevented from leaking out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a removable battery unit in which the battery unit can be freely removed.

[0002]

2. Description of the Related Art In recent years, battery-operated portable electronic devices have been increasing. FIG. 22 shows the power supply section of the device 3 thus operated by the battery, in which the terminals of the battery 1 are connected to the positive terminal 4 and the negative terminal 5 via the circuit section 2 having the protection circuit and the capacity display circuit. ing.

Rechargeable secondary batteries are often used as the power source of these devices in consideration of economy.
However, since the secondary battery has a limitation on the number of times of charging / discharging, a battery that has reached the end of its life can be replaced with a new battery.

In this case, in consideration of economy, the circuit portion having a charging function and the battery portion including the battery body are divided into
When the battery reaches the end of its life, only the battery part is replaced. FIG. 23 shows such a configuration, which is divided into a battery pack 11 and a circuit pack 12, and the battery pack 11 is
The circuit pack 12 has terminals 13 and 14, and the circuit pack 12 includes terminals 15 to 18.

Then, the battery pack 11 and the circuit pack 12
24, as shown in FIG. 24, the terminal 13 and the terminal 1
5 and the terminals 14 and 16 contact each other, so that the battery pack 11 can be charged and discharged.

[0006]

However, in such a conventional detachable battery unit, since the terminal of the battery portion is exposed, it is easy to connect a load to the terminal as shown in FIG. Therefore, there is a risk of battery safety and destruction of the battery due to over discharge.

The present invention has been made in view of the above circumstances, and is intended to ensure the safety of the battery by preventing the power from being supplied to the load only by connecting the load to the battery terminal.

[0008]

In order to solve such an object, the invention of claim 1 provides a battery pack (11) and an output terminal (13) of the battery pack when the battery pack (11) is mounted on the battery pack (11). , 14) in which the battery voltage is supplied via the circuit pack (12), the battery (31) in the battery pack (11) is the circuit pack (12). ) Is disconnected from the output terminals (13, 14).

According to a second aspect of the present invention, in the first aspect of the invention, the circuit pack (12) has a protrusion (71) provided on the side surface, and the battery pack (11) has an opening (43) provided on the side surface.
And the elastic pressing member (42) provided at the back of the opening (43) and pressed when the protrusion (71) is inserted into the opening (43), and the pressing of the elastic pressing member (42) is released. At this time, the shape is deformed by the elastic force, and the circuit with the battery (31) is disconnected by the elastic deformation.

According to a third aspect of the present invention, in the second aspect of the invention, the elastic pressing member (42) is electrically conductive and has a convex arc toward the opening (43), and the convex portion is a protrusion (71).
Is pressed to move the tip of the elastic pressing member (42) to contact the battery side circuit.

According to a fourth aspect of the invention, in the second aspect of the invention, the elastic pressing member presses the conductive movable contact piece (61) and the conductive movable contact piece (61) toward the opening (63). The movable movable contact piece (6
1) when it is biased toward the opening (63) side,
1) The fixed contact piece (1
4, 62).

According to a fifth aspect of the present invention, in the first aspect of the invention, the battery (31) is connected to the output terminal (14) with the electronic switches (51, 52) connected in series, and the electronic switch (51, 52) is connected. The control terminal of 52) is a circuit pack (1
It is characterized in that a control signal is externally supplied via a switch (53) connected when the battery pack (2) is attached to the battery pack (11).

According to a sixth aspect of the invention, in the fifth aspect of the invention, the control terminal is the battery pack (11) and the circuit pack (1).
It is characterized in that the structure is not exposed when separated from 2).

[0014]

According to the invention of claim 1, when the battery pack (11) is detached from the circuit pack (12), the battery (31) in the battery pack (11) is detached from the output terminals (13, 14).

According to the second aspect of the present invention, the elastic pressing member (4) is formed by separating the projection (71) from the opening (43).
The pressure of 2) is released, the elastic force deforms the shape, and the elastic deformation disconnects the circuit from the battery (31).

According to the invention of claim 3, the elastic pressing member (42).
The tip moves to contact the battery side circuit.

According to a fourth aspect of the present invention, there is provided a movable movable contact piece (6).
1) is urged toward the opening (63) side and the protrusion (7)
1) The fixed contact piece (1
4, 62).

According to a fifth aspect of the invention, an electronic switch (51,
The control terminal of 52) is a switch (53) connected when the circuit pack (12) is mounted in the battery pack (11).
A control signal is supplied from the outside via.

[0019]

FIG. 1 is a diagram showing the basic form of the present invention.
It is composed of a battery pack 11 and a circuit pack 12, and the battery pack 11 is connected to the positive terminal 13 and the negative terminal 14 via a switch 32 inserted in series with the battery 31.

The circuit pack 12 has a positive terminal 15 and a negative terminal 16 connected to a positive terminal 13 and a negative terminal 14 on the battery pack 11 side, a positive terminal 17 and a negative terminal 18 connected to a load, and a battery 31. It is designed to supply charging current and to limit current when overloaded.

When the battery 31 has reached the end of its life, the battery pack 11 is removed and replaced with a new one. Then, as shown in FIG. 2, the new battery pack 11 is replaced with the circuit pack 1.
When attached to terminal 2, terminal 13 and terminal 15 come into contact, and terminal 1
4 and the terminal 16 come into contact with each other, and the replaced battery pack 11 can be used.

The switch 32 of the battery pack 11 is
With the structure described later, as shown in FIG. 1, the battery pack 11
When the battery pack 11 is attached to the circuit pack 12, the battery pack 11 is turned off when it is removed, but it is turned on as shown in FIG.

When the switch 32 is turned on, the circuit pack 12 can be charged, and the battery 31 can be discharged toward the circuit pack 12,
The discharge voltage is supplied from the terminals 17 and 18 of the circuit pack 12 to a load (not shown).

That is, when the battery pack 11 is removed, the battery 31 is attached to the terminals 13 and 14 of the battery pack 11.
Therefore, even if a load or a charger is connected to the terminal, the battery 31 is not affected at all and it is safe. However, by connecting the battery pack 11 to the circuit pack 12, the battery 31 is connected to a load or a charger and can be used.

FIG. 3 is a view showing a structure in which the battery 31 is cut off from the terminals 13 and 14 when the circuit pack 12 is removed, and mainly shows a cross section of the battery pack 11. In the battery pack 11, the negative terminal of the battery 31 is connected to the negative terminal 14 for external connection of the circuit pack.
Of the L-shaped fixing portion 11a integrally provided with the casing in the upper right corner of the casing internal space of the battery pack 11 is connected to the contact piece 41 fixed horizontally in a relatively upper position. Has been done.

An opening 43 into which the protrusion 71 provided on the left side of the circuit pack 12 is fitted is provided near the center of the right side wall of the housing of the battery pack 11, and the L-shaped fixing is provided at the back of the opening 43. A contact piece 42 that is elastically deformed by being pressed by the protrusion 71 is fixed to the portion 11a.

The contact piece 42 has a semi-circular elastic portion 42a that is elastically deformed by being pressed by the protrusion 71, and a contact piece portion 42b that rises from the tip end thereof in a state parallel to the contact piece 41, When the elastic portion 42a is pressed by the protrusion 71 and elastically deformed, the contact piece portion 42b moves upward and the contact piece 4b is moved.
It comes in contact with 1.

The left end of the contact piece 42 is connected to the positive-side terminal 13, whereby the protrusion 71 of the circuit pack 12 is fitted into the battery pack 11 and the battery pack 11
When the circuit pack 12 is mounted, the contact piece 42 is elastically deformed and the contact piece 41 and the contact piece portion 42b come into contact with each other.
Circuit is formed, and the battery is connected to the terminals 13 and 14.

When the mounting of the battery pack 11 and the circuit pack 12 is released, the elastic deformation of the elastic portion 42a is released and the contact piece 41 and the contact piece portion 42b do not come into contact with each other. To be separated.

FIG. 4 is a circuit diagram showing a second embodiment. By mounting the battery pack 11 and the circuit pack 12, the switch 53 is connected to the position opposite to the one shown in the drawing, and the control terminal of the circuit pack 12 is connected. A control signal sent from the FET 61 is sent to the FET 5 via the control terminal 54 of the battery pack 11.
1, 52 are turned on, whereby the voltage of the battery 31 is output to the positive terminal 13 and the negative terminal 14.

The positive terminal 13 of the battery pack 11 is connected to the positive electrode of the battery 31, the negative electrode of the battery 31 is connected to the drain of the FET 52, the source of the FET 52 is connected to the source of the FET 51, and the drain of the FET 51 is connected to the negative terminal 14 and It is connected to the A terminal of the switch 53, that is, the terminal connected to the parent terminal when the circuit pack is not attached.

The gates of the FETs 51 and 52 are commonly connected and connected to the parent terminal of the switch 53.
The B terminal, that is, the terminal connected to the parent terminal when the circuit pack is attached is connected to the control terminal 54. FET5
1 includes a transistor 51a and a side diode 51b. The FET 52 is composed of a transistor 52a and a parasitic diode 52b.

The switch 53 is constructed as shown in FIG. That is, the opening 6 into which the protrusion 71 of the circuit pack 12 is fitted is provided in the vicinity of the central portion of the right side wall of the housing of the battery pack 11.
3 is provided, and the negative terminal 14 is provided in contact with the lower end of the opening 63. Further, on the right side wall of the battery pack 11, the control terminal 54 is provided slightly above the opening 63, and the positive terminal 13 is provided above it.

The negative terminal 14 is in contact with a contact piece 61 pressed by an elastic insulator 60,
The contact piece 61 is adapted to move to the left side against the elasticity of the insulator 60 when the circuit pack 12 is attached to the battery pack 11, and at the moving destination thereof, the fixing portion 11b extending from the housing is provided. A fixed contact piece 62 is provided, and the contact piece 61 is provided.
Touches the contact piece 62.

The positive terminal 13 is connected to the positive terminal of the battery 31, and the contact piece 61 is connected to the gates of the FETs 51 and 52.
The negative terminal 14 is adapted to be connected to the drain of the FET 51. The contact piece 61 is A of the switch 53 in FIG.
The terminal and contact piece 62 correspond to the B terminal of the switch 53.

When the battery pack 11 is mounted on the circuit pack 12, the terminal 13 contacts the terminal 17, the terminal 54 contacts the terminal 61, and the terminal 14 contacts the terminal 16.

In the circuit of FIG. 4, when the circuit pack 12 is attached to the battery pack 11, the FETs 51 and 52 are turned on by the signal supplied from the circuit pack 12, whereby the voltage of the battery 31 is changed. Terminals 13, 14
It will be sent to.

Charging is performed through the diode 52b and the transistor 51a when the transistor 51a is on, and discharging is performed through the diode 51b and the transistor 52a when the transistor 52a is on.

FIG. 6 is a circuit diagram showing a third embodiment. Instead of the FET of FIG. 5, a relay 81 and its contact 82 form a circuit of the battery 31. Also in this example, when the circuit pack 12 is attached to the battery pack 11, the switch 83 is turned on by the protrusion 71,
At this time, when the control voltage is supplied from the circuit pack 12 to the control terminal 54, the relay 81 is energized, the contact 82 is turned on, and the battery 31 is ready to be charged or discharged.

FIG. 7 is a circuit diagram showing a fourth embodiment, which is an example in which the battery pack 11 is provided with an auxiliary power supply terminal 91. The auxiliary power supply terminal 91 and the control power supply terminal 54 are shown in FIG.
As shown in, the space 112 surrounded by the protective cover 111
It is configured to be exposed inside. With this configuration, even if the battery pack 11 is removed,
Since a load or the like cannot be easily connected to the auxiliary power supply terminal 91 and the control power supply terminal 54, safety is ensured.

At this time, the circuit pack 12 is provided with a bracket 121 as shown in FIG.
1 fits into the space 112. Then, the protective cover 111 of the battery pack 11 and the circuit pack 12
As shown in FIG. 9, the bracket 121 of the electrode 9
1, 54 and electrodes 92, 61 are provided and are configured to contact each other. Further, the electrodes 13 and 14 on the battery pack 11 side are the electrodes 1 on the circuit pack 12 side.
The contact with 5, 16 is as described above.

FIG. 10 is a circuit diagram showing a fifth embodiment, which is an example in which a protection circuit for preventing overcharge and overdischarge of the battery 31 is built in the battery pack 11 side. The positive terminal of the battery 31 is connected to the cathodes of the zener diodes 101 and 102, one end of the relay contact 82, and the terminal 91.

The negative terminal of the battery 31 has resistors 105 to 10
6 and the emitters of the transistors 107 to 108 and the negative terminal 14. The anode of the Zener diode 101 is connected to one end of the resistor 103, and the other end of the resistor 103 is connected to the other end of the resistor 105 and the transistor 1.
It is connected to the base of 07.

The anode of the Zener diode 102 is connected to one end of the resistor 104, and the other end of the resistor 104 is connected to the resistor 10.
6 and the base of the transistor 108 and the collector of the transistor 107.

The collector of the transistor 108 is connected to the terminal 54 via the relay coil 81, and the relay contact 82
The other end of is connected to the positive terminal 13. In this circuit, the breakdown voltage of the Zener diode 101 is
The voltage is set to a value slightly lower than the overvoltage generated by the overcharge of the battery 31, and the breakdown voltage of the Zener diode 102 is set to the lowest usable voltage of the battery 31.

In the circuit thus constructed, the voltage of the battery 31 is higher than the breakdown voltage of the Zener diode 102 and smaller than the breakdown voltage of the Zener diode 101 when the normal charge / discharge is performed. It has become. Therefore, the Zener diode 102 breaks down, and a predetermined voltage is always supplied to the base of the transistor 108.

When the circuit pack 12 is connected in this state and the terminal 92 and the terminal 61 are connected on the circuit pack 12 side, the power supply voltage is supplied to the terminal 54 of the battery pack 11 and the transistor 108 is turned on. Is activated. As a result, the relay contact 82 is turned on and the battery voltage is supplied from the positive terminal 13 to the circuit pack 12.

When the battery 31 is used in this state and the terminal voltage drops due to discharge, the terminal voltage of the battery 31 eventually becomes lower than the breakdown voltage of the Zener diode 102. In this state, no voltage is supplied to the base of the transistor 108, the transistor 108 is turned off, and the relay coil 81 is deenergized. This turns off the relay contact 82, disconnects the battery 31 from the circuit pack 12, and protects it from an over-discharged state.

On the contrary, the voltage rises due to overcharge, and the battery 3
When the voltage of 1 becomes higher than the breakdown voltage of the Zener diode 101, the Zener diode 101 is also broken down. Therefore, the transistor 107
Turns on and shorts the base-emitter of the transistor 108, so that the transistor 108 turns off. Therefore, the relay coil 81 is deenergized at this time as well, and the battery 3
1 is disconnected from the circuit pack 12 and protected from overcharging.

In the circuit of FIG. 1, the terminals 91 and 54 are covered with a protective cover as shown in FIG. 8, and even if the battery pack 11 is removed,
The terminal cannot be easily touched. However, when the circuit pack 12 is connected to the battery pack 11, as shown in FIG.
It is configured to be connected to the corresponding terminal on the side.

FIG. 11 is a diagram showing a sixth embodiment.
The recess 131 is provided on the battery pack 11 side, and the electrode 91 and the electrode 54 are provided in the back of the recess 131 so that the electrodes cannot be easily touched from the outside to ensure the safety of the battery 31. The circuit pack 12 is provided with the protrusion 132, and the terminals 92 and 61 are provided at positions corresponding to the terminals 91 and 54 at the tip end portion thereof.

With this structure, by mounting the circuit pack 12 on the battery pack 11,
The protrusion 132 of the circuit pack 12 is the recess 1 of the battery pack 11.
31 is fitted, the terminals 91 and 92 come into contact, and the terminal 54
And the terminal 61 come into contact with each other.

FIG. 12 is a diagram showing a seventh embodiment.
Inside the battery pack 11, there are provided magnets 151 and 152 which are attracted by contractionally biased springs, and the terminals 9 are attached thereto.
1 and 54 are provided. Then, the circuit pack 12 side is provided with magnets 161 and 162 having polarities opposite to those of the magnets 151 and 152, and terminals 92 and 61 are provided therein.
Is provided.

With this structure, when the battery pack 11 and the circuit pack 12 are mounted, the magnets are attracted to each other, and the terminals 91 and 54 are attracted to and contact the terminals 92 and 61 against the contraction force of the spring. .

13 to 16 are views showing an eighth embodiment, in which a groove 181 is provided in the upper part of the battery pack 11, and a hollow shutter 182 is inserted in the groove 181. A linear spring 184 is provided in the short side direction inside the shutter 182, and both ends of the spring 184 are engaged with holes 185 provided on both sides of the groove 181 shown in FIG. 14 in the state shown in FIG. .

When the circuit pack 12 shown in FIG. 15 is engaged with the battery pack 11 in this state, the projection 192 provided on the short side surface of the projecting portion 191 causes the projection 192 provided in the hole 1 of the shutter 182.
It is inserted in 83. As a result, the protrusion 192 presses the spring 184, and as shown in FIG.
Bend 84. Then, both ends of the spring 184 eventually come off the hole 185, and the shutter 182 moves rearward as shown in FIG.

After the shutter 182 has moved, FIG.
As shown in FIG. 7, the terminals 13, 14, 54, 91 provided on the upper surface of the recess 186 of the battery pack 11 appear, and they come into contact with the corresponding terminals on the circuit pack 12 side.

For this reason, the circuit pack 1 is added to the battery pack 11.
When the 2 is not attached, the terminals 13, 14, 54 and 91 are not exposed, so that safety can be secured. Then, when the circuit pack 12 is attached to the battery pack 11, those terminals appear and contact the corresponding terminals of the circuit pack 12, so that charging and discharging are possible.

In the above embodiment, the control signal is transmitted while keeping the electrical contact with the terminal, but this may be a combination of the light emitting diode 202 and the phototransistor 201 as shown in FIG.

Further, in the above embodiment, the positive terminal 17
Although the negative terminal 18 and the negative terminal 18 are provided on the circuit pack 12 side, part or both of them may be provided on the battery pack 11 side.

For example, FIG. 18 shows an embodiment in which the positive terminal 17 and the negative terminal 18 are not provided on the circuit pack 12 side in the embodiment of FIG. 1 described above, but are provided on the battery pack 11 side. In this case, the terminal 14 of the battery pack 11 and the terminal 16 of the circuit pack 12 are connected to the two terminals 14a, 1 respectively.
It is divided into 4b and 16a, 16b and arranged so that they are connected to each other. The negative terminal 18 is connected to the terminal 14b.
The positive terminal 17 is connected to the connection point between the switch 32 and the terminal 13.

Furthermore, the switch 301 is provided in the circuit pack 12, and the terminals 16a and 16b are connected via the switch 301.

Then, the battery pack 11 and the circuit pack 12
When they are coupled, the switch 301 is turned on. Thereby, the electric power of the battery 31 can be taken out from the positive terminal 17 and the negative terminal 18.

Alternatively, as shown in FIG. 19, only the positive terminal 17 may be provided on the battery pack 11 and the negative terminal 18 may be provided on the circuit pack 12 side.

In the embodiment of FIG. 4, the positive terminal 1
Although the 7 and the negative terminal 18 are provided on the circuit pack 12 side, they may be provided on the battery pack 11 side as shown in FIG.

Alternatively, as shown in FIG. 21, the negative terminal 18 is provided on the circuit pack 12 side, but only the positive terminal 17 may be provided on the battery pack 11 side.

[0067]

As described above, according to the first to sixth aspects of the invention, when the battery pack is detached from the circuit pack, the battery voltage does not appear at the terminal to which the battery voltage is output. There is an effect that the battery cannot be used with the pack removed, and the safety of the battery can be ensured.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing the basic idea of the present invention.

FIG. 2 is a diagram showing a state in which the battery pack and the circuit pack shown in FIG. 1 are mounted.

FIG. 3 is a cross-sectional view showing the structure of the switch in FIG. 1 according to the embodiment of the present invention.

FIG. 4 is a circuit diagram showing a second embodiment of the present invention.

5 is a cross-sectional view showing the structure of the switch in FIG.

FIG. 6 is a circuit diagram showing a third embodiment of the present invention.

FIG. 7 is a circuit diagram showing a fourth embodiment of the present invention.

FIG. 8 is a circuit diagram showing a fifth embodiment of the present invention.

9 is a perspective view showing a protective cover in FIG.

10 is a cross-sectional view showing a state in which the battery pack and the circuit pack shown in FIG. 9 are connected.

FIG. 11 is a diagram showing a sixth embodiment of the present invention.

FIG. 12 is a diagram showing a seventh embodiment of the present invention.

FIG. 13 is a perspective view showing an eighth embodiment of the present invention.

FIG. 14 is a perspective view showing a state where the shutter in FIG. 13 is open.

FIG. 15 is a perspective view showing a structure of a circuit pack mounted on the battery pack of FIG.

16 is a diagram showing a state in which the spring is bent in FIG.

FIG. 17 is a diagram showing a concept of performing signal transmission by a photo coupler.

FIG. 18 is a diagram showing a configuration of a modified example of the embodiment shown in FIG.

FIG. 19 is a diagram showing the configuration of still another modification of the embodiment of FIG.

20 is a diagram showing a configuration of a modified example of the embodiment shown in FIG.

FIG. 21 is a diagram showing the configuration of still another modification of the embodiment of FIG.

FIG. 22 is a block diagram showing a conventional example.

FIG. 23 is a diagram showing a state in which a battery pack and a circuit pack are separated.

FIG. 24 is a diagram showing a state in which a circuit pack is attached to a battery pack.

FIG. 25 is a diagram showing a state in which a load is connected to the battery pack.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 11 Battery pack 11a L-shaped fixed part 12 Circuit pack 13 thru | or 18, 54, 61 Terminal 31 Battery 32, 53, 83 Switch 41, 42 Contact piece 42a Elastic part 42b Contact piece part 43, 63 Opening 60 Insulator 71, 132, 192 Protrusion 81 Relay 82 Contact 91 Auxiliary power supply terminal 101, 102 Zener diode 103 to 106 Resistor 107, 108 Transistor 111 Protective cover 131, 186 Recess 151, 152, 161, 162 Magnet 181 Groove 182 Shutter 184 Spring 191 Projection

Claims (6)

[Claims] 1. A detachable battery unit comprising a battery pack and a circuit pack to which a battery voltage is supplied via an output terminal of the battery pack when the battery pack is mounted on the battery pack. The battery is detachable from the output terminal when the battery pack is detached from the circuit pack. 2. The circuit pack according to claim 1, wherein the circuit pack has a protrusion provided on a side surface thereof, and the battery pack is provided with an opening provided on the side surface and at the back of the opening and is pressed when the protrusion is inserted into the opening. A detachable battery unit comprising an elastic pressing member, which is deformed by an elastic force when the pressing of the elastic pressing member is released, and the elastic deformation disconnects a circuit from a battery. 3. The elastic pressing member according to claim 2, wherein the elastic pressing member is electrically conductive and has a convex arc in the direction of the opening, and when the projection presses the convex portion, the tip of the elastic pressing member moves, A detachable battery unit having a structure in contact with a battery side circuit. 4. The elastic pressing member comprises a conductive movable contact piece and an insulating pressing member for pressing the conductive movable contact piece toward the opening, wherein the movable contact piece has the opening. A detachable battery unit characterized in that it is pressed by different fixed contact pieces when it is biased to the side and when it is pressed by a protrusion. 5. The battery according to claim 1, wherein the battery is connected to the output terminal in a state where the electronic switches are connected in series, and the control terminal of the electronic switch is a switch connected when the circuit pack is attached to the battery pack. A detachable battery unit characterized in that a control signal is supplied from the outside through the battery unit. 6. The removable battery unit according to claim 5, wherein the control terminal has a structure which is not exposed when the battery pack is detached from the circuit pack.