JP3203138B2 - Battery pack - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack which can prevent a short circuit of a battery when the battery is disconnected from an electric device.

[0002]

2. Description of the Related Art A battery pack has an electrode structure that is more likely to cause a short circuit than a single battery. This is because the + and-electrode terminals are close to each other. Further, since the output voltage of the battery pack is increased by connecting a plurality of batteries in series, the short-circuit current increases. When the electrode terminals are short-circuited and an excessive current flows, the performance of the battery is significantly reduced.
In addition, the battery and the short-circuit metal may be heated by Joule heat and put into a dangerous state.

In order to avoid this danger, a battery pack has been developed in which a short circuit does not occur when the battery pack is detached from electric equipment. These battery packs are described in the following publications. Japanese Utility Model Publication No. Sho 59-19336 Japanese Utility Model Publication No. 4-14361 Japanese Utility Model Publication No. 4-47257 Japanese Utility Model Publication No. Sho 63-87769

The battery pack described in the above publication has a shutter that covers a battery terminal when the battery pack is detached from an electric device. When the battery pack is set in the electric device, the shutter moves from the surface of the electrode terminal and is removed. Therefore, when set in an electric device, the electrode terminal can be connected to the power terminal of the electric device. When the battery pack is removed from the electric device, the electrode terminals are covered with a shutter to prevent a short circuit due to metal contact with the electrode terminals.

The battery pack described in the above publication has a built-in reed switch inside. In order to control the reed switch, the electric device has a built-in magnet. The reed switch is turned on when approaching a magnet of an electric device and turned off when away from the magnet. In a battery pack of this structure, when set in an electric device, a reed switch is turned on by a magnet, and power is supplied from the battery to the electric device. When the battery pack is removed from the electric device, the reed switch is turned off, so that even if the metal contacts the electrode terminals, the battery is not short-circuited.

In the battery pack described in the above publication, a leaf switch is connected in series with the battery. The leaf switch has a lever protruding from the surface of the casing of the battery pack. When the lever is pressed, the leaf switch is turned on, and when the lever is not pressed, the leaf switch is turned off. When the battery pack is set in an electric device, a lever is pressed to turn on a leaf switch, and power is supplied from the battery to the electric device. When the battery pack is removed from the electric device, the lever is no longer pushed and the leaf switch is turned off. For this reason, if you remove the battery pack from electrical equipment,
The battery does not short-circuit even if metal contacts the electrode terminals.

In the battery pack described in the above publication, a connection switch having mechanical movable contacts is connected in series with the battery. The connection switch has two metal plates that can be elastically deformed. The metal plates are arranged close to each other and are pushed through an opening in the casing. When the metal plate is pushed through the opening, the metal plates come into contact with each other and turn on the connection switch. If the metal plate is not pressed,
The metal plate is elastically deformed and separated, turning off the connection switch. An electric device using this battery pack has a protrusion that presses a metal plate through an opening. Therefore, when the battery pack is set in the electric device, the metal plate is pressed by the protrusion to turn on the connection switch, but when the battery is removed from the electric device, the metal plate is not pressed and the connection switch is turned off. For this reason, with the battery pack not set in electrical equipment,
Even if the metal contacts the electrode terminal, the battery will not be short-circuited.

[0008]

The conventional battery packs described in the above publications have the following three types of structures to prevent short circuits. …… A structure that covers the electrode terminals with a cover …… A structure with a built-in reed switch… A structure with a built-in switch for mechanical movable contacts

In the battery pack of the type (1), since a shutter which can slide on the casing is provided, a portion for covering the electrode terminals is complicated, and the manufacturing cost is increased. In addition, if the shutter causes sliding failure, the battery terminal that has removed the battery pack from the electrical equipment cannot be reliably covered, and there is a danger of short-circuiting. The battery cannot be set properly in electrical equipment. Therefore, this structure has disadvantages that the structure of the casing becomes complicated and it is difficult to slide the shutter reliably for a long period of time.

The above-mentioned disadvantage can be solved in the battery pack having the above structure because the reed switch is used. In particular, the reed switch has a feature that the contacts can be switched off in an ideal environment by shutting off the contacts from the outside air since the contacts are built in an airtight case made of glass. This is because the contacts can be actuated by magnetic force. However, since a reed switch switches contacts using magnets, it is difficult to adopt a structure that can switch a large current. This is because it is difficult to contact a large contact with a strong pressing force and to release a contact with a strong pressing force without fail. Therefore, the reed switch can be effectively used for a battery pack having a small load current or discharge current, but has a problem in the life of the reed switch when used for a battery pack which charges and discharges with a large current. In particular, it cannot be used at all for a battery pack that incorporates a large-capacity battery and rapidly charges the battery with a large current.

The above type of battery pack can be structured to strongly press the mechanical movable contact.
It can be used for battery packs that charge and discharge with large current. However,
When the movable contact of the switch is pressed with a strong force, the reaction acts on the connection between the battery pack and the electric device. This is because, with the battery pack set in the electric device, the movable contact of the battery pack is strongly pressed by a part of the electric device. Therefore, in the battery pack having this structure, it is necessary that the connection portion to the electric device has a strong structure. In addition, since the battery pack is mounted on the electric device in a state where a part of the electric device presses the movable contact of the battery pack with a strong force, it is necessary to strongly press the battery pack and mount the battery device on the electric device.
Since the strongly connected battery pack is removed from the electrical equipment,
It is difficult to make the structure easily removable. Further, the structure in which the switching is performed by pressing the movable contact has a disadvantage that the pressing force of the movable contact is reduced as it is used. This is because when the movable contact is pressed with a strong force, the shape gradually changes. Therefore, it is extremely difficult for the switch of the movable contact to reliably operate for a long period of time, and there is a problem in durability.

The applicant of the present application has developed a battery pack P having the structure shown in FIG. 1 in order to solve the conventional disadvantages. In the battery pack P shown in this figure, a short-circuit prevention switching element 1 is connected in series with a battery 2. The short-circuit prevention switching element 1 is connected between the electrode of the battery 2 and the electrode terminal 3. The control circuit 4 is connected to the short-circuit prevention switching element 1. The control circuit 4 is a circuit that detects that the battery pack P has been set in the electric device K and switches the short-circuit prevention switching element 1 to the ON state.

In the battery pack P of FIG. 1, the control circuit 4 switches the short-circuit prevention switching element 1 to the ON state only when the battery pack P is set in the electric device K. When the battery pack P using the FET for the short-circuit prevention switching element 1 is set in the electric device K, a signal of “High” is output from the control circuit 4 to the gate of the FET, and the FET is turned on. When the FET is turned on, the battery 2 is connected to the electrode terminal 3 via the short-circuit prevention switching element 1. In this state, the battery pack P supplies power from the battery 2 to the electric device K. When the battery pack P is detached from the electric device K, the control circuit 4 outputs a "Low" signal to the gate of the FET to turn off the FET. When the FET is turned off, the battery 2 of the battery pack P is electrically disconnected from the electrode terminal 3. Therefore, in this state, the battery pack P
The battery 2 will not be short-circuited even if a metal or the like comes into contact with the positive and negative electrode terminals 3.

In this manner, the short-circuit prevention switching element 1 such as an FET for interrupting the connection between the battery 2 and the electrode terminal 3 is provided.
Has a feature that it is electrically turned on and off by the control circuit 4 and does not require a mechanically movable contact.
That is, unlike the conventional battery pack P, there is no need to provide a structure for mechanically pressing the switch when setting the switch in the electric device K. Even when the short-circuit prevention switching element 1 is charged and discharged with a large current, a strong pressing force is not required for switching the same. This is because it can be electrically switched on and off. In addition, since the switching operation is performed electrically, there is no failure caused by poor contact, and there is a feature that the operation is ensured for a long period of time.

However, when the battery pack 2 shown in FIG. 1 is disconnected from the electric equipment, the control input terminal 5 is connected to the positive electrode terminal 3, and the positive and negative electrode terminals 3 make contact, the battery 2 is turned off. There is a short-circuit disadvantage. That is, when the three terminals of the + and-electrode terminals 3 and the control input terminal 5 of the battery pack P come into contact with the same metal or the like, there is a problem that the battery 2 is short-circuited. This state does not occur frequently, but may occur, for example, when the battery pack P is stored together with another metal product.

The present invention has been developed with the object of preventing this problem, and an important object of the present invention is to provide a simple structure that can effectively prevent a short circuit of a battery built in a battery pack. It is to provide a battery pack.

[0017]

The battery pack of the present invention comprises:
The following structure is provided to achieve the above object. The battery pack according to claim 1 has all the following configurations. (A) The battery pack P has a short-circuit prevention switching element 1 connected in series with the battery 2. (B) The battery pack P is a short-circuit prevention switching element 1
The electrode of the battery 2 is connected to the electrode terminal 3 via. (C) The short-circuit prevention switching element 1 is connected to a control circuit 4 that detects that the battery pack P has been set in the electric device K and turns on the short-circuit prevention switching element 1. (D) The control circuit 4 is connected to the control input terminal 5. (E) The battery pack P is exposed outside the case, and the electrode terminal 3 connected to the power supply terminal 7 of the electric device K and the short circuit prevention switching element 1 provided in the electric device K are turned on. And a control input terminal 5 connected to a control output terminal 6 of the electric device K that outputs an ON signal to be turned on. (F) When the battery pack P is mounted on the electric equipment K, the electrode terminals 3 of the battery pack P are connected to the power terminals 7 of the electric equipment K,
The control input terminal 5 of the battery pack P is connected to the control output terminal 6 of the electric device K, and an ON signal is input from the control output terminal 6 of the electric device K to the control input terminal 5 of the battery pack P. 4 is configured to turn on the short-circuit prevention switching element 1 so that electric power is supplied from the battery pack P to the electric device K.

A battery pack according to a second aspect has the following configuration. (A) The battery pack P has a short-circuit prevention switching element 1 connected in series with the battery 2. (B) The battery pack P is a short-circuit prevention switching element 1
The electrode of the battery 2 is connected to the electrode terminal 3 via. (C) The short-circuit prevention switching element 1 is connected to a control circuit 4 that detects that the battery pack P has been set in the electric device K and turns on the short-circuit prevention switching element 1. (D) The control circuit 4 is connected to the control input terminal 5. (E) The battery pack P is exposed to the outside of the case and has the electrode terminals 3 connected to the power supply terminal 7 of the electric device K and the signal generation built in the electric device K and driven by the self-power supply 12. The control circuit 4 is connected to a control output terminal 6 for outputting an ON signal of the circuit 11, and outputs an ON signal of the signal generation circuit 11 to the control circuit 4.
Is provided with a control input terminal 5 for inputting the control signal to the terminal. (F) When the battery pack P is mounted on the electric equipment K, the electrode terminals 3 of the battery pack P are connected to the power terminals 7 of the electric equipment K,
The control input terminal 5 of the battery pack P is connected to the control output terminal 6 of the electric device K, and the ON signal of the signal generation circuit 11 of the electric device K is transmitted from the control output terminal 6 through the control input terminal 5 of the battery pack P. The power supply is supplied to the electric device K from the battery pack P by being input to the control circuit 4 and turning on the short-circuit prevention switching element 1 by the ON signal.

Further, the battery pack according to claim 3 of the present invention has the following configuration. (A) The battery pack P has a short-circuit prevention switching element 1 connected in series with the battery 2. (B) The battery pack P is a short-circuit prevention switching element 1
The electrode of the battery 2 is connected to the electrode terminal 3 via. (C) The short-circuit prevention switching element 1 is connected to a control circuit 4 that detects that the battery pack P has been set in the electric device K and turns on the short-circuit prevention switching element 1. (D) The control circuit 4 is connected to the control input terminal 5. (E) The battery pack P is exposed outside the case, and outputs an ON signal of the electrode terminal 3 connected to the power supply terminal 7 of the electric device K and the signal generation circuit 11 built in the electric device K. The signal generation circuit 1 is connected to the control output terminal 6.
A control input terminal 5 for inputting an ON signal output from 1 to the control circuit 4 and a supply terminal 8 connected to a power supply terminal 9 connected to a signal generation circuit 11 built in the electric device K are provided. . (F) The supply terminal 8 of the battery pack P is connected via a high resistance member R to an electrode of a battery incorporated in the battery pack P. (G) When the battery pack P is mounted on the electric equipment K, the electrode terminals 3 of the battery pack P are connected to the power terminals 7 of the electric equipment K,
The control input terminal 5 of the battery pack P is connected to the control output terminal 6 of the electric device K, the supply terminal 8 of the battery pack P is connected to the power receiving terminal 9 of the electric device K, and the signal generation circuit 11 of the electric device K outputs an ON signal. This ON signal is input from the control output terminal 6 to the control circuit 4 via the control input terminal 5 of the battery pack P. The ON signal causes the control circuit 4 to turn on the short-circuit prevention switching element 1 and turn on the pack. The electric power is supplied from the battery P to the electric device K.

[0020]

The battery pack according to the first aspect of the present invention is
Short circuit of the battery can be reliably prevented. The battery pack has a short-circuit prevention switching element 1 connected in series with the battery 2. The short-circuit prevention switching element 1 is turned ON only when an ON signal is input to the control input terminal 5. When no ON signal is input to the control input terminal 5, the short-circuit prevention switching element 1 is turned off. When the short-circuit prevention switching element 1 is in the off state, the battery is not short-circuited even if the +-electrode terminal 3 is connected. The battery pack P is
When removed from the electrical equipment K, the +-
May be electrically connected. In the battery pack according to the first aspect of the present invention, since the short-circuit preventing switching element 1 is connected between the battery 2 and the electrode terminal 3, unless the short-circuit preventing switching element 1 is turned on, the positive and negative electrode terminals are connected. Even if the battery 3 is short-circuited, the battery 2 is not short-circuited. In the battery pack P of the first aspect, the voltage between the control input terminal 5 and the positive electrode terminal 3 is −
The electrode terminal 3 is provided. When the electrode terminals 3 and the control input terminals 5 are arranged in this arrangement, the control input terminal 5 is connected to the-electrode terminal 3 when the + and-electrode terminals 3 are erroneously connected. Therefore, no ON signal is input to the control input terminal 5, and the short-circuit prevention switching element 1 is turned off.
There is no short circuit from the battery.

Further, in the battery pack P shown in FIG. 3 according to the second aspect of the present invention, when the battery pack is detached from the electric device K, the short circuit of the battery 2 is prevented regardless of how the terminals are connected. You. This is because, in the battery pack P in this figure, the short-circuit prevention switching element 1 is turned on only when an ON signal is input to the control input terminal 5. As long as the battery pack P is not connected to the electric device K, no ON signal is input to the control input terminal 5.

Further, in the battery pack shown in FIG. 4 according to the third aspect of the present invention, when the battery is detached from the electric equipment, the short circuit of the battery 2 can be prevented regardless of how the terminals are connected. . This is because, also in the battery pack P of this figure, the short-circuit prevention switching element 1 is turned on only when an ON signal is input to the control input terminal 5. As long as the battery pack P is not connected to the electric device K, no ON signal is input to the control input terminal 5.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate the 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 easy to understand the claims, the numbers corresponding to the members shown in the embodiments are referred to as "claims", "actions", and "actions". In the column of "Means for solving the problem". However, the members shown in the claims are
It is by no means specific to the members of the embodiment.

FIG. 2 shows a circuit diagram of the battery pack P. In the battery pack P of this figure, a short circuit prevention switching element 1 for preventing a short circuit of the battery 2 is connected in series with the battery 2. The short-circuit prevention switching element 1 is two FETs connected in series with each other. The two FETs have gates connected to an AND circuit 4A constituting the control circuit 4. The upper FET has its source connected to the negative electrode of battery 2 and its drain connected to the source of the lower FET. Lower F
ET connects the source to the negative electrode terminal 3. The positive electrode of the battery 2 is connected to the positive electrode terminal 3 of the battery pack P via a lead wire.

The short-circuit prevention switching element 1 composed of two FETs is simultaneously switched on and off by the control circuit 4 in a synchronized manner. The control circuit 4 includes two AND circuits 4A connected to the gates of the respective FETs. The two AND circuits 4A have one input terminal connected to the control input terminal 5 of the battery pack P and the other input terminal connected to the overcharge / discharge prevention circuit 10. AND circuit 4A
Are connected to the gates of the respective FETs.

The control input terminal 5 of the battery pack P is connected to the control output terminal 6 of the electric device K. Control output terminal 6
Is "H" when the battery pack P is set in the electric device K.
high "signal to the control input terminal 5. Therefore, the control output terminal 6 is connected to the + power supply terminal 7 inside the electric equipment K. The battery pack P is set in the electric equipment K. And one input terminal of the AND circuit 4A
Through the control input terminal 5 and the control output terminal 6,
Side, and a “High” signal is input. The AND circuit 4A turns on the FET when a signal of “High” is input to both input terminals, and turns off the FET when the input of one of the input terminals becomes “Low”. Although not shown, the gate terminal of the lower FET is “High” or “Low” with respect to the source potential.
Is connected, the level shifter that outputs
The lower FET is on / off controlled.

In a normal state, the overcharge / overdischarge prevention circuit 10 supplies "High" to the input terminal of the AND circuit 4A.
The signal of is output. Only when it is necessary to prevent overcharge and overdischarge of the battery 2, the overcharge / overdischarge prevention circuit 1
0 outputs a "Low" signal to the input terminal of the AND circuit 4A. Therefore, when the battery pack P can be used normally, the overcharge / overdischarge prevention circuit 10 inputs a “High” signal to the AND circuit 4A. Therefore, when a “High” signal is input from the control input terminal 5, the AND circuit 4 </ b> A turns on both FETs and supplies power from the battery 2 to the electric device K.

The electrode terminal 3 and the control input terminal 5 are provided outside the case of the battery pack P. With the battery pack P removed from the electric device K, the control input terminal 5
Is connected to the + -side electrode terminal 3 and the +-electrical device K is connected, the battery 2 is short-circuited. In order to effectively prevent this state, the battery pack P shown in FIG.
Has the control input terminal 5 disposed outside the negative electrode terminal 3 and the negative electrode terminal 3 disposed between the control input terminal 5 and the positive electrode terminal 3. That is, the control input terminal 5 is disposed apart from the positive electrode terminal 3 and close to the negative electrode terminal 3. Further, the control input terminal 5 is arranged close to the negative electrode terminal 3. The control input terminal 5 is connected to the negative electrode terminal 3
, The possibility that the control input terminal 5 is connected to the positive electrode terminal 3 in a state where the battery pack P is detached from the electric device K can be reduced. Therefore, there is a feature that the "High" signal is input to the control input terminal 5 and the + and-electrode terminals 3 are connected and short-circuited can be particularly effectively prevented.

In the battery pack P shown in FIG. 2, a part of an overcharge / overdischarge prevention circuit 10 for preventing overcharge and overdischarge of the battery 2 is used in combination with a circuit for preventing a short circuit of the battery 2. That is, the FET connected in series with the battery 2 is used in combination with the short-circuit prevention switching element 1 for preventing short-circuit. Therefore, the battery pack P having this circuit configuration has an advantage that the battery 2 can be effectively prevented from being short-circuited by providing the AND circuit 4A and the control input terminal 5. For the battery pack P which does not include a circuit for preventing overcharge and overdischarge, the overcharge / overdischarge protection circuit 10 is omitted from the battery pack P shown in FIG. In the battery pack P, the control input terminal 5 is connected to the gate of the FET via a buffer, and when a "High" signal is input to the control input terminal 5, the FET is turned on and the control input terminal 5 is set to "Low". ”, The FET is turned off.

The battery pack shown in FIG. 3 transmits an ON signal from a signal generation circuit 11 built in the electric equipment K to a control circuit 4.
To turn on the short-circuit prevention switching element 1. The electric device K to which the battery pack is mounted includes a signal generation circuit 11 for outputting an ON signal for controlling the short-circuit prevention switching element 1 of the battery pack P to an ON state, and a self-power supply 12 for driving the signal generation circuit 11. Built-in. The self-power supply 12 is built into the electric device K because power is not supplied to the electric device K unless the short-circuit prevention switching element 1 of the battery pack P is controlled to the ON state.

The signal generation circuit 11 outputs an ON signal for controlling the control circuit 4 of the battery pack P to control the short-circuit prevention switching element 1 to an ON state. The ON signal output from the signal generation circuit 11 is an AC signal of a specific frequency, a specific digital signal, or a DC signal of a specific level.

The battery pack P has a control circuit 4 and a switching element 1 for preventing short-circuit. The control circuit 4 turns on the short-circuit prevention switching element 1 when the ON signal is input from the signal generation circuit 11. The battery pack P includes a +-electrode terminal 3 and a control input terminal 5 to which an ON signal is input from the electric device K. Electrode terminal 3
Is connected to the power terminal 7 of the electric device K, and the control input terminal 5
Is disposed at a position connected to the control output terminal 6.

When the battery pack P shown in FIG. 3 is detached from the electric equipment K, the short-circuit prevention switching element 1 is kept in the off state. This is because an ON signal is not input from the signal generation circuit 11 to the control circuit 4. For this reason, even if the battery terminal P is disconnected from the electric device K, the +/- electrode terminal 3 is connected, and the control input terminal 5 is further connected to the electrode terminal 3, the built-in battery 2 is short-circuited. Nothing.

Further, in the same manner as the battery pack P shown in FIG. 2, the battery pack P shown in FIG. 2 does not short-circuit even when the + -electrode terminal 3 is connected in a state where it is disconnected from the electric equipment K. The control input terminal 5 is disposed closer to the negative electrode terminal 3 than the positive electrode terminal 3. Signal generation circuit 1
In the battery pack P in which the control circuit 4 turns on the short-circuit prevention switching element 1 in response to the ON signal output from the switch 1, the short-circuit prevention switching element 1 is not turned on unless an ON signal is input from the control input terminal 5. Control input terminal 5
For example, when the ON signal output from the DC is a specific level of DC, when the control input terminal 5 is connected to the + electrode terminal 3 with a specific resistance, there is a very small probability,
There is a possibility that a DC level signal similar to the ON signal is input. Further, the control input terminal 5 and the + electrode terminal 3 may be intermittently contacted, and a signal similar to the ON signal output from the signal generation circuit 11 may be input from the + electrode terminal 3 to the control input terminal 5. There is. As shown in FIG. 3, the battery pack P having the negative electrode terminal 3 disposed between the control input terminal 5 and the positive electrode terminal 3 can effectively short-circuit the battery 2 even in such a state. Can be prevented. This is because the control input terminal 5 is connected to the negative electrode terminal 3.

FIG. 4 shows a specific example in which the battery 2 built in the battery pack drives the signal generation circuit 11 built in the electric equipment K. The battery pack P shown in FIG.
A supply terminal 8 for supplying power to the signal generation circuit 11 of the electric device K is provided. The supply terminal 8 is connected to the power receiving terminal 9 of the electric device K, and supplies power to the signal generation circuit 11. The supply terminal 8 is connected to the positive electrode of the battery 2 via the high resistance member R. The high-resistance member R prevents the battery 2 from being short-circuited when the battery pack P is taken out of the electric device K and the supply terminal 8 is connected to the negative electrode terminal 3. The resistance value of the high resistance member R is designed to be the largest resistance value that can drive the signal generation circuit 11.

The electric device K to which the battery pack P is mounted has a power receiving terminal 9, a control output terminal 6, and a power terminal 7. The power receiving terminal 9 is connected to a power supply circuit of the signal generation circuit 11, and the control output terminal 6 is connected to an output side of the signal generation circuit 11.

The battery pack P shown in FIG.
Is set to the electric device K, the electrode terminal 3 becomes the power terminal 7
The control input terminal 5 is connected to the control output terminal 6, and the supply terminal 8 is connected to the power receiving terminal 9. In this state, the signal generation circuit 11 is driven by the battery 2 of the battery pack P and outputs an ON signal. The ON signal is input to the control circuit 4 through the control output terminal 6 and the control input terminal 5. The control circuit 4 switches the short-circuit prevention switching element 1 to the ON state in response to the ON signal. When the short-circuit prevention switching element 1 is turned on, the battery 2 supplies power to the load of the electric device K.

When the battery pack P is removed from the electric equipment K, no ON signal is input to the control input terminal 5, and the short-circuit prevention switching element 1 is held in the ON state. Therefore,
Even if the battery pack P is removed from the electric device K and the +/- electrode terminals 3 are connected, the battery 2 is not short-circuited.

Preferred arrangements of the terminals of the battery pack P shown in FIG. 4 are shown in FIGS. In the battery pack P shown in these figures, the negative electrode terminal 3 is disposed between the control input terminal 5 and the supply terminal 8. When the negative electrode terminal 3 is provided between the control input terminal 5 and the supply terminal 8 in this manner, when a plurality of terminals are simultaneously connected, as in the battery pack P shown in FIG. 5 or one of the supply terminals 8 is connected to the negative electrode terminal 3, so that the signal generation circuit 11 does not output an ON signal, and controls the short-circuit prevention switching element 1 to an OFF state so that the short-circuit of the battery 2 is prevented. There is a feature that can be reliably prevented.

FIG. 9 shows a battery pack P in which the control input terminal 5 and the supply terminal 8 are used together. In the battery pack P shown in this figure, the + side of the battery 2 is connected to the control input terminal 5 via a high resistance. A capacitor is connected between the control input terminal 5 and the control circuit 4. The capacitor inputs an AC ON signal input to the control input terminal 5 to the control circuit 4.

The electric equipment K to which the battery pack P is mounted has the control output terminal 6 connected to the power supply circuit of the signal generating circuit 11. A capacitor is connected between the control output terminal 6 and the output side of the signal generation circuit 11. The condenser is
An AC ON signal output from the signal generation circuit 11 is output to the control output terminal 6. The signal generation circuit 11 outputs an AC ON signal that can pass through the capacitor.

When the battery pack P shown in this figure is set in the electric equipment K, the electrode terminal 3 is connected to the power supply terminal 7 and the control input terminal 5 is connected to the control output terminal 6. In this state, the signal generation circuit 11 is driven by the battery 2 of the battery pack P and outputs an AC ON signal. The ON signal is input to the control circuit 4 through the capacitor C, the control output terminal 6, the control input terminal 5, and the capacitor C. Control circuit 4
Switches the short-circuit prevention switching element 1 to an ON state by an AC ON signal. When the short-circuit prevention switching element 1 is turned on, the battery 2 supplies power to the load of the electric device K.

When the battery pack P is removed from the electric device K, no ON signal is input to the control input terminal 5, and the short-circuit prevention switching element 1 is kept in the ON state. Therefore,
Even if the battery pack P is removed from the electric device K and the +/- electrode terminals 3 are connected, the battery 2 is not short-circuited.

The battery pack P shown in FIG. 9 also has the control input terminal 5 disposed outside the negative electrode terminal 3, similarly to the battery pack P shown in FIG. Battery pack P of this structure
Can connect the control input terminal 5 to the negative electrode terminal 3 when the positive and negative electrode terminals 3 are connected after disconnecting from the electric device K. Therefore, there is a feature that the ON signal is not input from the control input terminal 5 and the short circuit prevention switching element 1 is turned off, so that the short circuit of the battery 2 can be reliably prevented.

[0046]

The battery pack of the present invention has a simple structure and has a feature that a short circuit of a battery built in the battery pack can be effectively prevented. It is the battery pack of the present invention,
This is because a short-circuit prevention switching element is connected to the battery pack in series with the battery, and the short-circuit prevention switching element is controlled and switched by a control circuit that detects that the battery pack is mounted on the electric device.

In particular, in the battery pack according to the first aspect of the present invention, the negative electrode terminal is disposed between the control input terminal and the positive electrode terminal, and the control input terminal is separated from the positive electrode terminal.
-It is arranged close to the electrode terminal. For this reason, when the battery pack is removed from the electric device and the plus and minus electrode terminals provided at both ends are connected by mistake, the control input terminal is connected to the minus electrode terminal. Therefore, when the + and-electrode terminals are short-circuited, no ON signal is input to the control input terminal. Since the ON signal is not input to the control input terminal, the short-circuit prevention switching element is turned off, and the battery does not short-circuit even if the electrode terminal of +-is short-circuited.

Further, the battery pack shown in FIG. 3 according to the second aspect of the present invention, when detached from electric equipment,
Since no ON signal is input from the signal generation circuit of the electric device, short-circuiting of the battery is effectively prevented regardless of how the terminals are connected. This is because the short-circuit prevention switching element is turned on only when the battery pack is set in the electric device and the control input terminal is connected to the control output terminal of the electric device.

Further, the battery pack according to the third aspect of the present invention is also mounted on an electric device, supplies power to a signal generation circuit of the electric device, and transmits an ON signal of the signal generation circuit to a control output terminal. Since the battery is connected to the electrode terminal only when the control input terminal is input to the control circuit of the battery pack and the control circuit turns on the short-circuit prevention switching element with an ON signal, the battery pack is disconnected from the electric device. There is a feature that the short circuit of the battery can be reliably prevented in the state.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a battery pack previously filed by the present applicant.

FIG. 2 is a circuit diagram of a battery pack according to an embodiment of the present invention.

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

FIG. 4 is a circuit diagram of a battery pack according to another embodiment of the present invention.

5 is a perspective view showing an arrangement of electrode terminals, control input terminals, and supply terminals of the battery pack shown in FIG. 4;

6 is a perspective view showing an arrangement of electrode terminals, control input terminals, and supply terminals of the battery pack shown in FIG. 4;

FIG. 7 is a perspective view showing an arrangement of electrode terminals, control input terminals, and supply terminals of the battery pack shown in FIG. 4;

8 is a perspective view showing an arrangement of electrode terminals, control input terminals, and supply terminals of the battery pack shown in FIG. 4;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Short-circuit prevention switching element 2 ... Battery 3 ... Electrode terminal 4 ... Control circuit 4A ... AND circuit 5 ... Control input terminal 6 ... Control output terminal 7 ... Power supply terminal 8 ... Supply terminal 9 ... Power receiving terminal 10 ... Overcharge overdischarge prevention Circuit 11 ... Signal generation circuit 12 ... Power supply P ... Pack battery K ... Electrical equipment R ... High resistance member C ... Capacitor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-266867 (JP, A) JP-A-5-135804 (JP, A) JP-A-7-29554 (JP, A) 47257 (JP, U) Fully open 1988-87769 (JP, U) Fully open 55-131063 (JP, U) Fully open 4-14361 (JP, U) Fully open 2,44,256 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) H02J ⁷ /00-7/10 H01M 2/10

Claims (3)

(57) [Claims] 1. A battery pack having all the following structures. (A) The battery pack (P) has a short-circuit prevention switching element (1) connected in series with the battery (2). (B) Battery pack (P) is a short-circuit prevention switching element
The electrode of the battery (2) is connected to the electrode terminal (3) via (1). (C) The short-circuit prevention switching element (1) includes a control circuit (4) that detects that the battery pack (P) is set in the electric device (K) and turns on the short-circuit prevention switching element (1). Connected. (D) The control circuit (4) is connected to the control input terminal (5). (E) The battery pack (P) is exposed outside the case,
Electrode terminal (3) connected to power terminal (7) of electrical equipment (K)
And a control input terminal connected to a control output terminal (6) of the electric device (K) that is provided in the electric device (K) and outputs an ON signal for controlling the short-circuit prevention switching element (1) to an ON state.
(5) is provided. (F) When the battery pack (P) is attached to the electrical equipment (K),
The electrode terminal (3) of the battery pack (P) is the power terminal of the electrical equipment (K)
In (7), the control input terminal (5) of the battery pack (P) is an electrical device (K).
Of the battery (P) from the control output terminal (6) of the electric device (K), and an ON signal is input to the control input terminal (5) of the battery pack (P). ) Turns on the short-circuit prevention switching element (1) so that electric power is supplied from the battery pack (P) to the electric device (K). (G) The battery pack (P) has the negative electrode terminal (3) disposed between the control input terminal (5) and the positive electrode terminal (3). 2. A battery pack having all of the following configurations. (A) The battery pack (P) has a short-circuit prevention switching element (1) connected in series with the battery (2). (B) Battery pack (P) is a short-circuit prevention switching element
The electrode of the battery (2) is connected to the electrode terminal (3) via (1). (C) The short-circuit prevention switching element (1) includes a control circuit (4) that detects that the battery pack (P) is set in the electric device (K) and turns on the short-circuit prevention switching element (1). Connected. (D) The control circuit (4) is connected to the control input terminal (5). (E) The battery pack (P) is exposed outside the case,
Electrode terminal (3) connected to power terminal (7) of electrical equipment (K)
Is connected to a control output terminal (6) that outputs an ON signal of a signal generation circuit (11) built in the electric device (K) and driven by a self-power supply (12), and the signal generation circuit (11 ) Is provided to a control input terminal (5) for inputting an ON signal of the control circuit (4) to the control circuit (4). (F) When the battery pack (P) is attached to the electrical equipment (K),
The electrode terminal (3) of the battery pack (P) is the power terminal of the electrical equipment (K)
In (7), the control input terminal (5) of the battery pack (P) is an electrical device (K).
Connected to the control output terminal (6) of the electric device (K), and the ON signal of the signal generation circuit (11) of the electric device (K) is transmitted from the control output terminal (6) through the control input terminal (5) of the battery pack (P). The control circuit (4) is input to the control circuit (4), and the control circuit (4) turns on the short-circuit prevention switching element (1) with an ON signal so that power is supplied from the battery pack (P) to the electric device (K). It is configured. 3. A battery pack having all the following structures. (A) The battery pack (P) has a short-circuit prevention switching element (1) connected in series with the battery (2). (B) Battery pack (P) is a short-circuit prevention switching element
The electrode of the battery (2) is connected to the electrode terminal (3) via (1). (C) The short-circuit prevention switching element (1) includes a control circuit (4) that detects that the battery pack (P) is set in the electric device (K) and turns on the short-circuit prevention switching element (1). Connected. (D) The control circuit (4) is connected to the control input terminal (5). (E) The battery pack (P) is exposed outside the case,
Electrode terminal (3) connected to power terminal (7) of electrical equipment (K)
Is connected to a control output terminal (6) for outputting an ON signal of a signal generation circuit (11) built in the electric device (K), and outputs an ON signal output from the signal generation circuit (11) to the control circuit. (Four)
Control input terminal (5), and the power receiving terminal (9) connected to the signal generation circuit (11) built into the electrical equipment (K)
And a supply terminal (8) connected to the power supply terminal. (F) The supply terminal (8) of the battery pack (P) is a high resistance material
(R) is connected to the electrode of the battery incorporated in the battery pack (P). (G) When the battery pack (P) is attached to the electrical equipment (K),
The electrode terminal (3) of the battery pack (P) is the power terminal of the electrical equipment (K)
In (7), the control input terminal (5) of the battery pack (P) is an electrical device (K)
And the supply terminal (8) of the battery pack (P) is connected to the power receiving terminal (9) of the electric device (K), and the signal generation circuit (11) of the electric device (K) is turned on. A signal is generated, and this ON signal is sent from the control output terminal (6) to the control input terminal of the battery pack (P).
The control circuit (4) is input to the control circuit (4) through (5), and the control circuit (4) turns on the short-circuit prevention switching element (1) by an ON signal, and power is supplied from the battery pack (P) to the electric device (K). Is configured to be supplied.