JPH0845561A - Secondary battery pack and its charging circuit - Google Patents

Abstract

PURPOSE:To simplify a charging circuit for the secondary battery pack. CONSTITUTION:The charging circuit 66 is provided with a charger 61. And the charging circuit 66 is also provided with a plus positive electrode terminal 62, a minus electrode terminal 64, and with a kind recognition terminal 63. A resistor R1 is connected to the output 60 of the charger 61 in series, and the plus electrode terminal 62 is connected to the other side of the main resistor R1. Besides, The charging circuit 66 is turned out a circuit where the output 60 of the charger 61 is connected to the kind recognition terminal 63, and an earth is connected to the minus electrode terminal 64.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery pack and its charging circuit.

[0002]

2. Description of the Related Art In general, a secondary battery pack may be prepared as a battery pack L incorporating a secondary battery having a large battery capacity and a battery pack S incorporating a secondary battery having a small battery capacity. The electrode terminals of the battery pack L and the battery pack S have the same shape. When charging the secondary batteries of two types of secondary battery packs having different capacities, it is necessary to distinguish the secondary battery packs and set the charging conditions.

FIG. 3 shows a conventional charging method.

As a method for electrically identifying the two types of secondary battery packs, it is common to provide the charging circuit 28 with a type identification terminal 26 in addition to the + electrode terminal 25 and the-electrode terminal 27. is there.

The secondary battery pack is also provided with a type identification terminal 2 in addition to the + electrode terminal 1 and the-electrode terminal 3.

The charging circuit 28 is provided with a charger 21 and an electrical detection circuit 22.

The output 23 of the charger 21 is connected to the positive electrode terminal 25, and the negative electrode terminal 27 is grounded. The type identifying terminal 26 of the charging circuit 28 is connected to the electrical detection circuit 22. In the electrical detection circuit 22, the signal line 29 of the type identification terminal 26 is pulled up to the power source by a resistor. The output 20 of the electrical detection circuit 22 is connected to the charger 21.
Control signal.

A secondary battery 6 is provided in the positive electrode terminal 1 of the battery pack L.
Of the secondary battery 6 is connected to the type identifying terminal 2 and the-electrode terminal 3 of the battery pack L described above.

The positive electrode terminal 1 of the battery pack S is used as the secondary battery 1
Connect to the + side of 5. The negative electrode terminal 3 of the battery pack S is connected to the negative side of the secondary battery 15. Battery pack mentioned above
Open the S type identification terminal 2.

When the battery pack L is charged, the charging circuit 2
8 and the battery pack L are connected. As a result, the charging circuit 28
The positive electrode terminal 25 of the battery pack L and the positive electrode terminal 1 of the battery pack L are connected, and the type identification terminal 26 of the charging circuit 28 and the battery pack L are connected.
The type identifying terminal 2 is connected, and the negative electrode terminal 27 of the charging circuit 28 and the negative electrode terminal 3 of the battery pack L are connected. The electrical detection circuit 22 detects the ground of the signal line 29 of the type identification terminal 26 to identify the battery pack L. The charger 21 is controlled by the electrical detection circuit 22, and the charger 2
The charging current of the output 23 of 1 is supplied to the + side of the battery 6.

When charging the battery pack S, the charging circuit 2
8 and the battery pack S are connected. As a result, the charging circuit 28
The positive electrode terminal 25 of the battery pack S and the positive electrode terminal 1 of the battery pack S are connected, and the type identification terminal 26 of the charging circuit 28 and the battery pack S are connected.
The type identification terminal 2 is connected, and the negative electrode terminal 27 of the charging circuit 28 and the negative electrode terminal 3 of the battery pack S are connected. The electrical detection circuit 22 detects the voltage of the signal line 29 of the type identification terminal 26 to identify the battery pack S. in this case,
The voltage of this signal line 29 is a voltage pulled up by a resistor to the power supply. The electric detection circuit 22 controls the charger 21 to supply the charging current of the output 23 of the charger 21 to the + side of the battery 15.

[0012]

However, in order to identify two types of battery packs on the charging circuit side, an electrical detection circuit for identifying two types of battery packs is required. This detection circuit has a problem that the circuit becomes complicated because it requires a logic circuit and the like.

Even if there is a detection circuit for identifying the battery pack, only two types of battery packs can be identified and charged.

[0014]

In order to solve such a problem, the charging circuit includes a + electrode terminal in which a resistor is connected in series to the output of the charger and the other side of the resistor is an input, and the present charger. Is provided with a type identification terminal to which the output of is connected and an electrode terminal to which the ground is connected.

In the battery pack L, the + electrode terminal and the type identification terminal of the battery pack L are connected to the + side of the secondary battery in the battery pack L. The negative side of the secondary battery in the battery pack L is connected to the negative electrode terminal of the battery pack L.

In the battery pack S, the + electrode terminal of the battery pack S is connected to the + side of the secondary battery in the battery pack S, and the type identification terminal is open. The negative side of the secondary battery in the battery pack S is connected to the negative electrode terminal of the battery pack S.

Further, in addition to the battery pack L and the battery pack S, three kinds of battery packs of the battery pack M are provided. The charging circuit is provided with a charger and an electrical detection circuit. Further, the charging circuit is provided with a + electrode terminal, a − electrode terminal, a type identifying terminal, and a second type identifying terminal.

A resistor R1 is connected in series to the output of the charger,
Connect the + electrode terminal to the other side of this resistor R1. Connect the charger output to the type identification terminal. -Connect the ground to the electrode terminal. The second type identification terminal is connected to the electrical detection circuit, and the output of the electrical detection circuit is used as a control signal for the charger. In this electrical detection circuit, the signal line from the second type identification terminal is pulled up to the power source by a resistor.

The battery pack L is provided with a second type identification terminal in addition to the positive electrode terminal, the negative electrode terminal and the type identification terminal. In the battery pack L, the + electrode terminal and the type identification terminal of the battery pack L are connected to the + side of the secondary battery in the battery pack L. The negative side of the secondary battery in the battery pack L is connected to the negative electrode terminal of the battery pack L and the second type identification terminal.

The battery pack M is provided with a second type identification terminal in addition to the + electrode terminal, the negative electrode terminal and the type identification terminal. In the battery pack M, the + electrode terminal of the battery pack M is connected to the + side of the secondary battery in the battery pack M. Open the type identification terminal. The negative side of the secondary battery in the battery pack M is connected to the negative electrode terminal of the battery pack M and the second type identifying terminal.

The battery pack S is provided with a second type identification terminal in addition to the + electrode terminal, the negative electrode terminal and the type identification terminal. In the battery pack S, the + electrode terminal of the battery pack S is connected to the + side of the secondary battery in the battery pack S. Open the type identification terminal. The negative side of the secondary battery in the battery pack S is connected to the negative electrode terminal of the battery pack S. The second type identification terminal is opened.

[0022]

[Function] When charging the battery pack L, the charging circuit and the battery pack L are connected. The output current of the charger passes through the type identification terminal of the charging circuit and the type identification terminal of the battery pack L and is supplied to the + side of the secondary battery.

When charging the battery pack S, the charging circuit and the battery pack S are connected. The charging current from the charger passes through the + electrode terminal of the charging circuit via the resistor and the battery pack S
It is supplied to the + side of the secondary battery through the + electrode terminal of.

Further, three types of batteries are charged. When charging the battery pack L, connect the charging circuit and the battery pack L. The electrical detection circuit detects the ground of the second type identification terminal. The charging current from the charger of the battery pack L is controlled by the electric detection circuit described above. Further, the charging current passes through the type identifying terminal of the charging circuit and the type identifying terminal of the battery pack L and is supplied to the + side of the secondary battery.

When charging the battery pack M, the charging circuit and the battery pack M are connected. In the charging circuit, the ground of the second type identification terminal is detected by the electrical detection circuit. The charging current from the charger of the battery pack M is controlled by the electric detection circuit described above. Further, the charging current is supplied to the + side of the secondary battery through the + electrode terminal of the charging circuit, the + electrode terminal of the battery pack M, and the + electrode terminal.

When charging the battery pack S, the charging circuit and the battery pack S are connected. In the charging circuit, the voltage of the second type identification terminal is detected by the electrical detection circuit to identify the battery pack S. In this case, the voltage of the signal line from the second type identification terminal is a voltage pulled up by a resistor to the power supply. The charging current from the charger of the battery pack S is controlled by the electric detection circuit described above. Also, the charging current is
The battery pack passes through the + electrode terminal through the resistance of the charging circuit
It is supplied to the + side of the secondary battery through the S + electrode terminal.

[0027]

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings.

FIG. 1A is a circuit diagram in which the charging circuit 66 and the battery pack L are connected.

FIG. 1B is a circuit diagram in which the charging circuit 66 and the battery pack S are connected.

The charging circuit 66 is provided with a charger 61.
Further, the charging circuit 66 is provided with a + electrode terminal 62, a − electrode terminal 64, and a type identification terminal 63. A resistor R1 is connected in series to the output 60 of the charger 61, and a + electrode terminal 62 is connected to the other side of the resistor R1. In addition, the charging circuit 66
Shows that the output 60 of the charger 61 is connected to the type identifying terminal 63 and the ground is connected to the negative electrode terminal 64.

The battery pack L is provided with a plus electrode terminal 40, a minus electrode terminal 42, and a type identifying terminal 41. Further, the battery pack L is provided with a secondary battery 45.

The + electrode terminal 40 and the type identifying terminal 41 of the battery pack L are connected to the + side of the secondary battery 45. The negative side of the secondary battery 45 of the battery pack L is the negative electrode terminal 4 of the battery pack L.
Connect to 2.

When charging the secondary battery 45 of the battery pack L, the charging circuit 66 and the battery pack L are connected. As a result, the + electrode terminal 62 of the charging circuit 66 and the + of the battery pack L
The electrode terminal 40 is connected, the type identification terminal 63 of the charging circuit 66 and the type identification terminal 41 of the battery pack L are connected, and the negative electrode terminal 64 of the charging circuit 66 and the negative electrode terminal 42 of the battery pack L are connected. . There are two types of paths through which the output current of the charger 61 flows. The first path is a path from the output 60 of the charger 61 to the + side of the secondary battery 45 through the + electrode terminal 62 and the + electrode terminal 40 via the resistor R1.
The second path is a path connecting the output 60 of the charger 61 to the + side of the secondary battery 45 through the type identification terminal 63 and the type identification terminal 41. Here, the resistance R1 described above is several tens of ohms. The resistance value between the output 60 of the charger 61 and the type identification terminal is sufficiently small as compared with the resistance R1 described above and can be ignored. Therefore, the current flowing through the + electrode terminal is sufficiently small compared to the current flowing through the type identifying terminal and can be ignored. Therefore, the output current of the output 60 of the charger 61 is 2 from the type identification terminal 63 of the charging circuit 66 to the battery pack L 2.
It can be said that it is supplied to the + side of the secondary battery 45. Secondary battery 45
The charging current at the start of charging is 190 mA. Secondary battery 4
The charging voltage at the start of charging of No. 5 is 7V. Secondary battery 45
When the voltage of reaches 7.5V, charging is completed. Secondary battery 4
5 is a nickel-cadmium battery or a nickel-hydrogen battery. The battery capacity of the secondary battery 45 is about 1500 mAh.

Similar to the battery pack L, the battery pack S is provided with three electrode terminals. Further, the battery pack S is provided with a secondary battery 55. The + electrode terminal 40 of the battery pack S is connected to the + side of the secondary battery 55. The negative side of the secondary battery 55 is connected to the negative electrode terminal 42 of the battery pack S described above. The type identification terminal 41 of the battery pack S is opened.

When charging the secondary battery 55 of the battery pack S, the charging circuit 66 and the battery pack S are connected. As a result, the + electrode terminal 62 of the charging circuit 66 and the battery pack S
The positive electrode terminal 40 of the charging circuit 66, the type identifying terminal 63 of the charging circuit 66 and the type identifying terminal 41 of the battery pack S are connected, and the negative electrode terminal 64 of the charging circuit 66 and the negative electrode terminal 42 of the battery pack S are connected. Connecting. The output current of the charger 61 is resistance
It flows through R1, through the + electrode terminal 62 of the charging circuit 66, through the + electrode terminal 40 of the battery pack S, and to the + side of the secondary battery 55. This current becomes the current for charging the secondary battery 55. Since the output current of the output 60 of the charger 61 flows through the resistor R1, the output voltage of the output 60 of the charger 61 rises and saturates at 9V. Further, the voltage of the positive electrode terminal 62 of the charging circuit 66 becomes 7V due to the charging current flowing through the resistor R1. Therefore, the charging current at the start of charging is 60 mA. Two
When the voltage of the secondary battery 55 reaches 7.5V, the charging ends. The secondary battery 55 is a nickel-cadmium battery or a nickel-hydrogen battery. The battery capacity of the secondary battery 55 is about 550 mAh.

The charging currents of the two types of secondary battery packs can be made to have a charging flow value suitable for the charging conditions of the secondary batteries 45 and 55 without using an electrical detection circuit.

Therefore, the charging circuit for charging the two types of battery packs can be constructed by an extremely simple circuit, and the charging circuit can be simplified, downsized, and priced.

Second Embodiment A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2A shows a charging circuit 79 and a battery pack L.
It is the circuit diagram which connected.

FIG. 2B shows a charging circuit 79 and a battery pack M.
It is the circuit diagram which connected.

FIG. 2C shows the charging circuit 79 and the battery pack S.
It is the circuit diagram which connected.

The charging circuit 79 is provided with a charger 71 and an electrical detection circuit 76. Further, the charging circuit 79 includes a positive electrode terminal 72, a negative electrode terminal 75, a type identification terminal 73, and a second electrode.
The type identification terminal 74 is provided.

The resistor R1 is connected in series to the output 70 of the charger 71, and the + electrode terminal 72 is connected to the other side of the resistor R1. Output 70 of the charger 71 to the type identification terminal 73
Connect. -Connect the ground to the electrode terminal 75. Second
Connecting the type identification terminal 74 and the electrical detection circuit 76 of
The output 77 of the electrical detection circuit 76 is used as a control signal for the charger 71. In the electrical detection circuit 76, the signal line 78 of the second type identification terminal 74 is pulled up to the power source by a resistor.

The battery pack L is provided with a positive electrode terminal 81, a negative electrode terminal 84, a type identifying terminal 82, and a second type identifying terminal 83. The + electrode terminal 81 and the type identification terminal 82 of the battery pack L are connected to the + side of the secondary battery 90. The negative side of the secondary battery 90 of the battery pack L is connected to the negative electrode terminal 84 and the second type identification terminal 83 of the battery pack L.

The battery pack M is provided with a positive electrode terminal 81, a negative electrode terminal 84, a type identifying terminal 82, and a second type identifying terminal 83. The + electrode terminal 81 of the battery pack M is connected to the + side of the secondary battery 80. Secondary battery 8 of battery pack M
The negative side of 0 is connected to the negative electrode terminal 84 and the second type identifying terminal 83 of the battery pack M. The type identification terminal 82 is opened.

The battery pack S is provided with a plus electrode terminal 81, a minus electrode terminal 84, a type identifying terminal 82, and a second type identifying terminal 83. The + electrode terminal 81 of the battery pack S is connected to the + side of the secondary battery 100. The negative side of the secondary battery 100 of the battery pack S is connected to the negative electrode terminal 84 of the battery pack S. Type identifying terminal 82 and second type identifying terminal 83
To open.

When charging the secondary battery 90 of the battery pack L, the charging circuit 79 and the battery pack L are connected. As a result, the + electrode terminal 72 of the charging circuit 79 and the + of the battery pack L
The electrode terminal 81 is connected, the type identifying terminal 73 of the charging circuit 79 and the type identifying terminal 82 of the battery pack L are connected, and the negative electrode terminal 75 of the charging circuit 79 and the negative electrode terminal 84 of the battery pack L are connected. , The second type identifying terminal 74 of the charging circuit 79 and the second type identifying terminal 83 of the battery pack L are connected. The electrical detection circuit 76 detects the ground of the signal line 78 of the second type identification terminal 74 connected to the negative side of the secondary battery 90. Output 77 of the electrical detection circuit 76
Is a control signal for the charger 71. Output 7 of this charger 71
As described in the first embodiment, the output current of 0 passes through the type identifying terminal 73, the type identifying terminal 82, and the secondary battery 9
It is supplied to the + side of 0.

When charging the secondary battery 80 of the battery pack M, the charging circuit 79 and the battery pack M are connected. As a result, the + electrode terminal 72 of the charging circuit 79 and the + of the battery pack M
The electrode terminal 81 is connected, the type identifying terminal 73 of the charging circuit 79 and the type identifying terminal 82 of the battery pack M are connected, and the negative electrode terminal 75 of the charging circuit 79 and the negative electrode terminal 84 of the battery pack M are connected. , The second type identifying terminal 74 of the charging circuit 79 and the second type identifying terminal 83 of the battery pack M are connected.

The second battery connected to the negative side of the secondary battery 90
The electrical detection circuit 76 detects the ground of the signal line 78 of the type identification terminal 74. The output 77 of the electrical detection circuit 76 is used as a control signal for the charger 71. The output current of the output 70 of the charger 71 is supplied to the + side of the secondary battery 80 through the + electrode terminal 72 and the + electrode terminal 81 via the resistor R1.

The battery pack L and the battery pack M cannot be discriminated from each other because both inputs 78 of the electrical detection circuit 76 are grounded.

The charging current of the battery pack L is supplied to the + side of the secondary battery 90 through the output 70 of the charger 71 through the type identifying terminal 73 and the type identifying terminal 82.

The charging current of the battery pack M is supplied to the + side of the secondary battery 80 through the + electrode terminal 72 and the + electrode terminal 81 via the resistor R1.

Therefore, the charging currents of the battery pack L and the battery pack M are controlled by the resistor R1.

When the secondary battery 100 of the battery pack S is charged, the charging circuit 79 and the battery pack S are connected. As a result, the + electrode terminal 72 of the charging circuit 79 and the + of the battery pack S
The electrode terminal 81 is connected, the type identifying terminal 73 of the charging circuit 79 and the type identifying terminal 82 of the battery pack S are connected, and the negative electrode terminal 75 of the charging circuit 79 and the negative electrode terminal 84 of the battery pack S are connected. , The second type identifying terminal 74 of the charging circuit 79 and the second type identifying terminal 83 of the battery pack L are connected.

The electrical detection circuit 76 detects the voltage pulled up by the resistance to the power source of the signal line 78 of the second type identification terminal 74 to identify the battery pack S. The electric detection circuit 76 uses the output 77 as a control signal for the charger 71.
The output current of the output 70 of the main charger 71 is supplied to the + side of the secondary battery 100 through the + electrode terminal 72 and the + electrode terminal 81 via the resistor R1.

Therefore, three types of battery packs can be charged, and the number of usable battery packs can be increased.

[0057]

As described in detail above, according to the present invention, 2
The electrical detection circuit may be unnecessary when identifying the type of battery pack. Further, although only two types of battery packs could be identified and charged, three or more types of battery packs can be identified and charged.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a conventional charging circuit and battery pack.

[Explanation of symbols]

 1, 40, 81 ... Positive electrode terminal of battery pack 2, 41, 82 ... Terminal for identifying type of battery pack 83 ... Second terminal for identifying type of battery pack 3, 42, 84 ... Negative electrode terminal of battery pack 6 , 15, 45, 55, 80, 90, 100 ... Secondary battery 23, 60, 70 ... Charger output 20, 77 ... Electrical detection circuit output 25, 62, 72 ... Charging circuit positive electrode terminal 26, 63, 73 ... Terminal for identifying type of charging circuit 74 ... Terminal for identifying second type of charging circuit 27, 64, 75 ... Electrode terminal of charging circuit 21, 61, 71 ... Charger 22, 76 ... Electrical detection Circuit 28, 66, 79 ... Charging circuit 29, 78 ... Signal line

Claims (7)

[Claims] 1. In a charging circuit for two types of secondary battery packs having different battery capacities, an output current control element connected between an output of the charger of the charging circuit and a + electrode terminal, and an output current control element connected to the output of the charger. A charging circuit having a type identification terminal and an electrode terminal that is connected to the ground. 2. A secondary battery pack connected to the charging circuit according to claim 1, wherein a + electrode terminal connected to the + side of the secondary battery of the secondary battery pack and a + side of the secondary battery are connected. A secondary battery pack comprising: a terminal for identifying the type of the secondary battery and an electrode terminal connected to the negative side of the secondary battery. 3. A secondary battery pack connected to the charging circuit according to claim 1, wherein a + electrode terminal connected to the + side of the secondary battery of the secondary battery pack, and a type identification terminal to be disconnected. A secondary battery pack comprising: an electrode terminal connected to the negative side of the secondary battery. 4. In a charging circuit for secondary battery packs having three or more different battery capacities, an output current control element connected between the output of the charger of the charging circuit and the + electrode terminal, and an output of the charger. A charging circuit comprising: a type identifying terminal to be connected, a second type identifying terminal connected to the electrical detection circuit of the charging circuit, and an-electrode terminal connected to ground. 5. The secondary battery pack connected to the charging circuit according to claim 4, wherein the + electrode terminal connected to the + side of the secondary battery, the − electrode terminal connected to ground, and the + of the secondary battery. A secondary battery pack comprising: a type identification terminal connected to the side of the secondary battery; and a second type identification terminal connected to the negative side of the secondary battery. 6. The secondary battery pack connected to the charging circuit according to claim 4, wherein the + electrode terminal connected to the + side of the secondary battery, the − electrode terminal connected to ground, and the type not connected A secondary battery pack comprising: an identification terminal; and a second type identification terminal connected to the negative side of the secondary battery. 7. A secondary battery pack connected to the charging circuit according to claim 4, wherein the + electrode terminal connected to the + side of the secondary battery, the − electrode terminal connected to ground, and the type not connected. A secondary battery pack comprising: an identification terminal; and a second type identification terminal that is not connected.