JP2005135854A - Battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery pack capable of generating a plurality of output voltage, reducing discharge when load is not connected, and restraining the generation of noise. <P>SOLUTION: Two kinds of voltages are output on external terminals 6, 7, 8 of the battery pack 1B. A power switch 19 of a voltage converter 11 is controlled by a control signal 20. The control signal 20 is generated from a start signal at a power source controller 32. The start signal, changing its value of voltage according to the switching on/off of a power source of a portable telephone to which the battery pack 1B is connected, is generated at the portable telephone side. When the battery pack 1B is connected to the portable telephone, the power source of the portable telephone is turned on, the voltage of the start signal becomes higher than a prescribed voltage and becomes lower than the prescribed voltage, when the power source is turned off. When the voltage of the start signal is higher than the prescribed voltage, the power switch 19 is turned on; and when the voltage of the of the start signal is lower than the prescribed signal, the power switch is turned off. The voltage converter 11 can be operated only when it is needed, by the control of the power switch 19. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a battery pack for a secondary battery such as a lithium ion battery.

  Since a lithium ion battery is vulnerable to overcharge and overdischarge, the battery pack and the protection circuit are usually integrated into a battery pack. There are three functions of the protection circuit: overcharge protection, overdischarge protection, and overcurrent protection. These protection functions will be briefly described.

  The overcharge protection function will be described. When a lithium ion battery is charged, the battery voltage continues to rise even after full charge. If this overcharge state occurs, there is a possibility that a dangerous state will occur. Therefore, charging must be performed at a constant current and a constant voltage, and the charging control voltage must be lower than the battery rating (for example, 4.2 V). However, there is a risk of overcharging due to the failure of the charger or the use of a different model charger. When overcharged and the battery voltage exceeds a certain voltage value, the protection circuit turns off the charge control FET and cuts off the charging current. This function is an overcharge protection function.

  The overdischarge protection function will be described. When the battery is discharged to a rated discharge end voltage or lower and the battery voltage is in an overdischarged state of, for example, 2 V to 1.5 V or lower, the battery may fail. When discharged and the battery voltage falls below a certain voltage value, the protection circuit turns off the discharge control FET and cuts off the discharge current. This function is an overdischarge function.

  The overcurrent protection function will be described. When the + and-terminals of the battery are short-circuited, a large current flows and there is a risk of abnormal heat generation. When the discharge current flows over a certain current value, the protection circuit turns off the discharge control FET and cuts off the discharge current. This function is an overcurrent protection function.

  Electronic devices that use the battery pack described above usually require several types of power supply voltage, so multiple voltage converters are provided in the electronic device, and the voltage converters generate the required voltages. I was letting.

  For example, since five power supply voltages as shown below exist in the mobile phone, the mobile phone has four voltage converters in addition to the output voltage of the secondary battery.

Voltage 1: 2.9V to 4.2V: Power supply for antenna radio wave generator Voltage 2: 3.0V: Microcomputer power supply Voltage 3: 5.0V: Power supply for digital camera CCD element / speaker drive power supply Voltage 4: 15V: Liquid crystal display Power supply 1
Voltage 5: -10V: Power supply 2 for liquid crystal display

  Conventionally, the output voltage of a lithium ion battery is as high as about 3.0 V to 4.2 V, and the purpose is to solve the problem that the output voltage of a general-purpose primary battery is considerably higher than 1.0 V to 1.5 V and is difficult to use. Patent Document 1 below describes a built-in voltage converter that converts the output voltage of the battery pack.

Japanese Patent Laid-Open No. 11-185824

  However, a battery pack incorporating a conventional secondary battery has two output terminals, and outputs a battery voltage as an output voltage or a single constant voltage converted as described in Patent Document 1. there were. Therefore, it is necessary to create a voltage required by the voltage converter in the electronic device body. Further, when a voltage converter is built in the battery pack, the battery pack self-discharges due to the power consumption of the voltage converter itself, and there is a problem of capacity reduction.

  Therefore, an object of the present invention is to eliminate the need for the electronic device body to have a voltage converter by outputting a plurality of output voltages, to suppress the problem of capacity reduction, and to generate from the voltage conversion circuit. An object of the present invention is to provide a battery pack that can reduce the influence of radiation noise.

In order to achieve the above-described problem, the present invention provides a battery pack having a built-in secondary battery.
One or more voltage converters;
A plurality of output terminals for outputting two or more different voltages;
The battery pack includes power supply control means for detecting whether or not the secondary battery is operating normally and turning on / off the power supply of the voltage converter according to the detection result.

The present invention provides a battery pack having a built-in secondary battery.
One or more voltage converters;
A plurality of output terminals for outputting two or more different voltages;
The battery pack includes power supply control means for detecting whether or not the voltage converter is operating normally and turning on / off the power supply of the voltage converter according to the detection result.

The present invention provides a battery pack having a built-in secondary battery.
One or more voltage converters;
A plurality of output terminals for outputting two or more different voltages;
An input terminal to which a start signal indicating whether or not the output of the voltage converter is required is input;
The battery pack includes power control means for turning on / off the power of the voltage converter in response to the start signal.

  According to this invention, a battery pack capable of generating a plurality of output voltages such as a battery voltage and other voltages can be realized. Therefore, it is not necessary for the electronic device to have a plurality of voltage converters, and the cost of the electronic device can be reduced. In addition, by standardizing the output voltage value and the like, it is possible to realize a battery pack that can be used for different electronic devices such as mobile electronic devices such as mobile phones. The user does not need to purchase a battery pack when purchasing a new electronic device.

  In the present invention, when the battery pack is operating normally or when necessary, the voltage converter is started to reduce the current consumption of the voltage converter, and the battery generated by providing the voltage converter Capacity reduction can be suppressed. For example, when a load (electronic device) is not connected to the battery pack, the voltage converter can be turned off to reduce self-discharge.

  When a DC / DC converter is used as the voltage converter, radiation noise is generated by switching control at a high frequency of 10 kHz to 2 MHz. In this invention, by having a DC / DC converter as a voltage converter inside the battery pack, the distance between the internal circuit of the electronic device and the DC / DC converter can be increased, and the influence of noise on the internal circuit of the electronic device is suppressed. it can. Further, by incorporating a voltage converter in the battery pack, high frequency electromagnetic wave noise can be reduced by an iron battery can in a rectangular battery or an aluminum laminate film in a lithium polymer battery.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a battery pack to which the present invention is applied. Reference numeral 1A indicates a battery pack as a whole, reference numeral 2 indicates a secondary battery, and reference numeral 3 indicates a voltage converter and a protection circuit. A voltage converter and a protection circuit 3 are connected to the secondary battery 2 via an electrical wiring 4.

  The secondary battery 2 is a lithium ion battery, a lithium polymer battery, a nickel metal hydride battery, a nickel cadmium battery, a lithium metal battery, or the like. In the case of a lithium ion battery, for example, a prismatic battery is used, and the secondary battery 2 is entirely covered with an iron battery can. In the case of a lithium polymer battery, the battery is sealed with an aluminum laminate film. The secondary battery may be a secondary battery of a type that will be developed in the future.

  External terminals 6, 7 and 8 connected to the voltage converter and protection circuit 3 through electrical wiring 5 are provided for the battery pack 1 </ b> A. These secondary battery 2, voltage converter and protection circuit 3 are built in a relatively hard case 9 made of a material such as plastic.

  FIG. 2 shows the internal arrangement of a battery pack 1A to which the present invention is applied. For example, the voltage converter 11 in the voltage converter and protection circuit 3 is mounted on the substrate 10. A protection circuit is mounted on the opposite surface of the substrate 10. A secondary battery 2 is disposed adjacent to the substrate 10. Unlike the configuration of FIG. 2, the voltage converter 11 may be disposed inside the secondary battery 2.

  The voltage converter 11 is a circuit that generates a stabilized output voltage having a value different from the input voltage (battery voltage). As the voltage converter 11, those having various configurations can be used. That is, a charger pump system using a capacitor and a switch element, a step-up converter (step-down converter) using a diode, an inductor, a capacitor, and a switch element, or a switching regulator using a transformer and a switch element can be used. Furthermore, a piezoelectric inverter using a piezoelectric transformer or a series regulator using a bipolar transistor element may be used as the voltage converter 11. As a charger pump type voltage converter and switching regulator, a very small one of about 4 mm square has been developed, and it is relatively easy to incorporate the voltage converter 11 together with the protection circuit in the battery pack 1A.

  FIG. 3 shows a circuit configuration of a first embodiment in which the present invention is applied to the above-described battery pack 1A. The positive electrode of the secondary battery 2 and the external terminal 6 are connected, and the negative electrode and the external terminal 8 are connected via a discharge current switch 12 and a charge current switch 13. Between the external terminals 6 and 8, the battery voltage of the secondary battery 2 is directly output. For example, the battery voltage of the secondary battery 2 is set to 2.5 V to 4.3 V as a normal voltage value.

  The switches 12 and 13 are composed of, for example, N-channel FETs, and parasitic diodes 14 and 15 are connected in parallel with the switches 12 and 13. Switches 12 and 13 are controlled by discharge control signal 17 and charge control signal 18 from protection circuit 16, respectively.

The protection circuit 16 has a general circuit configuration, and the switches 12 and 13 are controlled by the protection circuit 16 to perform overcharge protection, overdischarge protection, and overcurrent protection. If the battery voltage is in a normal state within the set voltage range, both the discharge control signal 17 and the charge control signal 18 are “1” (
This means a logical level) and the switches 12 and 13 are turned on. Therefore, discharging from the secondary battery 2 to the load and charging from the charger to the secondary battery 2 can be performed freely.

When the battery voltage is lower than the set voltage range, the discharge control signal 17 becomes “0” (meaning a logical level), the switch 12 is turned off, and the discharge current is prohibited from flowing. Thereafter, when a charger is connected, charging is performed via the diode 14.

When the battery voltage is higher than the set voltage range, the charging control signal 18 becomes “0”, the switch 13 is turned off, and charging is prohibited. The discharge to the load is performed via the diode 15.

Further, when the external terminals 6 and 8 are short-circuited, an excessive discharge current flows and the FET may be destroyed. Therefore, when the discharge current reaches a predetermined current value, the discharge control signal 17 is “0”. Thus, the switch 12 is turned off and the discharge current is prohibited from flowing.

  One power supply terminal of the voltage converter 11 is connected to the positive electrode of the secondary battery 2 through the voltage converter power switch 19, and the other power supply terminal is connected to the negative electrode of the secondary battery 2 through the switches 12 and 13. Is done. The output terminal of the voltage converter 11 is derived as the external terminal 7. A constant voltage is controlled between the external terminals 7 and 8 by the voltage converter 11, and an output voltage having a value different from the battery voltage is taken out. Specifically, the power switch 19 includes a semiconductor switch, a relay contact, and the like.

  Further, a power controller 21 is provided that generates a power control signal 20 for controlling the voltage converter power switch 19. When the battery voltage appearing between the external terminals 6 and 8 is normally within the set voltage range (2.5 V to 4.3 V), the power controller 21 turns on the power switch 19 and is outside the set voltage range (2.49 V). The power switch 19 is turned off at the time of the following or 4.31V or more). By providing the power switch 19, current consumption by the voltage converter 11 when the remaining discharge capacity of the battery is small can be reduced. Therefore, there is an effect of suppressing discharge when the remaining discharge capacity of the battery is small.

  FIG. 4 shows a circuit configuration of the second embodiment of the present invention. Portions corresponding to those in FIG. 3 are denoted by the same reference numerals. An AND operation unit (for example, an AND gate) indicated by reference numeral 22 is provided, and the AND operation unit 22 generates a power control signal 20 for controlling the voltage converter power switch 19.

A discharge control signal 17 and a charge control signal 18 output from the protection circuit 16 are supplied to the AND operator 22. As described above, during normal operation, these control signals are both “1”, and both the switches 12 and 13 are turned on. When the protection function is activated, one of the control signals becomes “0”. Accordingly, the AND operator 22 generates a “1” power control signal 20 that turns on the power switch 19 when both the discharge control signal 17 and the charge control signal 18 are “1”.

  The second embodiment can suppress the discharge when the remaining discharge capacity of the battery is small, and can prevent the voltage converter 11 from being broken by an excessive voltage. Thus, the first and second embodiments are configured to turn on the voltage converter 11 and operate the voltage converter 11 when the secondary battery is operating normally.

The discharge current switch 12 and the charging current switch 13 may be connected to the positive electrode side of the secondary battery 2. In this case, a P-channel FET is used, and in the normal operation, both the discharge control signal 17 and the charge control signal 18 are set to “0”. When the protection function is activated, one control signal is set to “1”. Therefore, the control signal to turn on the voltage converter power switch is
It is generated only when the discharge control signal 17 and the charge control signal 18 are both “0” by the NOR gate. By providing the voltage converter power switch 19, the current consumption of the voltage converter when the remaining discharge capacity of the battery is small can be reduced.

  5, reference numeral 1B indicates another configuration of the battery pack to which the present invention is applied, and FIG. 6 shows the internal arrangement of the battery pack 1B. Similar to the battery pack 1A described above, in the battery pack 1B, the voltage converter and the protection circuit 3 are connected to the secondary battery 2 via the electrical wiring 4. External terminals 6, 7, 8, and 31 connected to the voltage converter and protection circuit 3 through the electrical wiring 5 are provided for the battery pack 1 </ b> B. The external terminal 31 is an input terminal for an activation signal of the voltage converter 11. The secondary battery 2, the voltage converter, and the protection circuit 3 are built in the case 9. A voltage converter 11 in the voltage converter and protection circuit 3 is mounted on the substrate 10. A protection circuit is mounted on the opposite surface of the substrate 10. The secondary battery 2 is disposed in contact with the substrate 10. The voltage converter 11 may be disposed inside the secondary battery 2.

  FIG. 7 shows a circuit configuration of a third embodiment in which the present invention is applied to the battery pack 1B having the four external terminals 6, 7, 8, and 31 described above. A power control signal 20 for controlling the power switch 19 of the voltage converter 11 is generated by the power controller 32.

  A voltage converter activation signal is supplied from the external terminal 31 to the power supply controller 32. Since the configuration other than the control configuration for the power switch 19 is the same as the configuration of the first embodiment shown in FIG. 3, the corresponding parts are denoted by the same reference numerals and the description thereof is omitted.

  The voltage converter activation signal is supplied from the outside. The voltage converter activation signal is a signal whose voltage value changes according to on / off of the power source of an electronic device, for example, a mobile phone, to which the battery pack 1B is connected, and is generated on the mobile phone side. When the battery pack 1B is connected to the mobile phone and the power of the mobile phone is turned on, the voltage of the start signal becomes equal to or higher than a set voltage (for example, 2.0 V or higher), and when the power is turned off, the start signal Is less than the set voltage.

  The power controller 32 turns on the power switch 19 when the start signal is equal to or higher than the set voltage, and turns off the power switch 19 when the start signal is smaller than the set voltage (for example, 1.9 V or less). 20 is generated. When the battery pack 1B is not connected to the electronic device body, the voltage converter power switch 19 is turned off.

  By controlling the voltage converter power switch 19 as described above, current consumption by the voltage converter 11 can be reduced. Therefore, there is an effect of preventing a decrease in the remaining discharge capacity when the remaining discharge capacity of the battery is small. Further, the voltage converter power switch 19 is controlled by the activation signal, so that the voltage converter 11 can be used when the battery pack is not connected to the electronic device or when the electronic device to which the battery pack is connected is off. Current consumption can be reduced. In the third embodiment, the voltage converter 11 is turned on and the voltage converter 11 is operated only when the output voltage of the voltage converter 11 is necessary.

  FIG. 8 shows a configuration in which the discharge current switch 12 and the charge current switch 13 in the third embodiment shown in FIG. 7 are realized by N-channel FETs 112 and 113, respectively. Other configurations are the same as those in FIG. Note that the switches 12 and 13 in the embodiments other than the third embodiment have the same FET configuration.

  FIG. 9 shows a circuit configuration of a fourth embodiment in which the present invention is applied to a battery pack 1B having four external terminals 6, 7, 8, and 31. A power control signal 20 for controlling the power switch 19 of the voltage converter 11 is generated by the power controller 33.

  A voltage converter start signal is supplied from the external terminal 31 to the power supply controller 33, and an overdischarge non-detection signal 34 is supplied from the protection circuit 16. Since the configuration other than the control configuration for the power switch 19 is the same as the configuration of the first embodiment shown in FIG. 3, the corresponding parts are denoted by the same reference numerals and the description thereof is omitted.

For example, when the secondary battery 2 becomes 2.49 V or less, it is detected that there is a possibility of overdischarge, and a discharge control signal 17 of, for example, “0” for turning off the discharge current switch 12 is generated by the protection circuit 16. Similar to the discharge control signal 17, the overdischarge non-detection signal 34 as a battery protection signal is a signal that is “1” in a normal state and “0” when an overdischarge is detected.

The power controller 33 is configured to be able to generate a power control signal 20 for turning on the power switch 19 only in a normal state where the overdischarge non-detection signal 34 is “1”. That is, as in the third embodiment, the power supply control signal 20 corresponding to the voltage value of the voltage converter activation signal input from the external terminal 31 is formed, but the battery voltage is smaller than the set voltage. When it is detected by the protection circuit 16, the overdischarge non-detection signal 34 becomes "0", and the power control signal 20 for turning on the power switch 19 is controlled by the power control regardless of the voltage value of the voltage converter activation signal. No output from the device 33.

  In the fourth embodiment, similarly to the third embodiment, when the battery pack 1B is not connected to the electronic device main body, the current consumption by the voltage converter 11 can be reduced, and the power supply of the main body is turned off. In this case, the current consumption of the voltage converter 11 can be reduced. Furthermore, in the fourth embodiment, when it is detected that the voltage of the secondary battery 2 is equal to or lower than the set voltage, current consumption by the voltage converter 11 is prevented from flowing, and overdischarge of the secondary battery 2 is prevented. There is an effect that can be done.

  In FIG. 10, reference numeral 1C indicates another configuration of the battery pack to which the present invention is applied. Similarly to the battery packs 1A and 1B described above, in the battery pack 1C, the voltage converter and the protection circuit 3 are connected to the secondary battery 2 via the electrical wiring 4. External terminals 6, 7, 8, and 31 connected to the voltage converter and protection circuit 3 through the electrical wiring 5 are provided for the battery pack 1 </ b> C.

  Further, a battery temperature sensor 35 for detecting the temperature of the secondary battery 2 is disposed in contact with or in proximity to the secondary battery 2. The secondary battery 2, voltage converter and protection circuit 3, and battery temperature / temperature sensor 35 are built in the case 9.

  FIG. 11 shows a circuit configuration of a fifth embodiment in which the present invention is applied to a battery pack 1 </ b> C having four external terminals 6, 7, 8, 31 and a battery temperature / temperature sensor 35. As in the fourth embodiment described above, the power controller 38 generates a power control signal 20 that controls the power switch 19 of the voltage converter 11.

  A voltage converter activation signal is supplied from the external terminal 31 to the power supply controller 38 and a battery temperature abnormality detection signal 37 is supplied from the battery temperature detector 36. Since the configuration other than the control configuration for the power switch 19 is the same as the configuration of the first embodiment shown in FIG. 3, the corresponding parts are denoted by the same reference numerals and the description thereof is omitted.

  In the fourth embodiment described above, the battery protection signal and the voltage converter activation signal are supplied to the power supply controller 33, whereas in the fifth embodiment, the battery temperature detector 36 supplies the battery temperature. An abnormality detection signal 37 and a voltage converter activation signal are supplied to the power supply controller 38. The battery temperature abnormality detection signal 37 is a signal that becomes “0” when the temperature of the secondary battery 2 rises to an abnormally high temperature, for example, 80 ° C. or more, and becomes “1” when the temperature is not normal. Signal.

When the battery temperature abnormality detection signal 37 is “1”, that is, the power supply controller 38, that is, the secondary battery 2
The power supply control signal 20 for turning on the power switch 19 is generated only in the normal state where the power supply is operating normally. Although the power supply control signal 20 corresponding to the voltage value of the voltage converter activation signal input from the external terminal 31 is formed, the temperature of the secondary battery 2 is abnormally high by the battery temperature detector 36. Is detected, the battery temperature abnormality detection signal 37 becomes “0”, and the power control signal 20 for turning on the power switch 19 is not output from the power controller 33 regardless of the voltage value of the voltage converter activation signal.

  In the fifth embodiment, when the battery pack 1C is not connected to the electronic device main body, the current consumption by the voltage converter 11 can be reduced, and the consumption of the voltage converter 11 is performed when the main body is off. The current can be reduced. Further, in the fifth embodiment, when the secondary battery temperature becomes abnormally high, the power supply of the voltage converter is turned off and the discharge is stopped. As a result, the battery pack can be prevented from rising in temperature.

  In FIG. 12, reference numeral 1D indicates another configuration of the battery pack to which the present invention is applied. Similarly to the battery packs 1A and 1B described above, in the battery pack 1D, the voltage converter and the protection circuit 3 are connected to the secondary battery 2 via the electrical wiring 4. External terminals 6, 7, 8, and 31 connected to the voltage converter and protection circuit 3 through the electrical wiring 5 are provided for the battery pack 1 </ b> D. Similarly to the battery pack 1 </ b> C, a battery temperature sensor 35 for detecting the temperature of the secondary battery 2 is disposed in the vicinity of the secondary battery 2.

  Furthermore, in the battery pack 1 </ b> D, a voltage converter temperature sensor 39 for detecting the temperature of the voltage converter 11 is disposed in contact with or close to the voltage converter 11. These secondary battery 2, voltage converter and protection circuit 3, battery temperature temperature sensor 35 and voltage converter temperature sensor 39 are built in the case 9.

  FIG. 13 shows a circuit configuration of a sixth embodiment in which the present invention is applied to a battery pack 1D having four external terminals 6, 7, 8, 31, a battery temperature sensor 35 and a voltage converter temperature sensor 39. Indicates. A power control signal 20 for controlling the power switch 19 of the voltage converter 11 is generated by the power controller 42.

  Similarly to the fifth embodiment described above, a voltage converter activation signal is supplied from the external terminal 31 and a battery temperature abnormality detection signal 37 is supplied from the battery temperature detector 36 to the power supply controller 42. The Further, a voltage converter temperature abnormality detection signal 41 is supplied from the voltage converter temperature detector 40 to the power supply controller 42. Since the configuration other than the control configuration for the power switch 19 is the same as the configuration of the first embodiment shown in FIG. 3, the corresponding parts are denoted by the same reference numerals and the description thereof is omitted.

In the sixth embodiment, when the temperature of the secondary battery 2 becomes abnormally high, for example, 80 ° C. or more, the battery temperature abnormality detection signal 37 from the battery temperature detector 36 becomes “0”. Regardless of the voltage value of the voltage converter activation signal input from the terminal 31 and the voltage converter temperature abnormality detection signal 41, the power supply control signal 20 for turning off the power switch 19 is generated from the power supply controller 42.

Further, when the temperature of the voltage converter 11 is abnormally high, for example, 80 ° C. or more, the voltage converter temperature detector 40 determines that the voltage converter 11 is not operating normally, and the voltage converter temperature detector The voltage converter temperature abnormality detection signal 41 from 40 becomes “0”. For example, the voltage converter 11 may generate heat due to a short circuit of a capacitor in the voltage converter 11 and the plastic of the case 9 may be melted to form a hole. In this case, the power supply control signal 20 for turning off the power switch 19 is generated from the power supply controller 42 regardless of the voltage value of the voltage converter activation signal input from the external terminal 31 and the battery temperature abnormality detection signal 37. The operation of the voltage converter 11 is stopped.

  In the sixth embodiment, when the battery pack 1C is not connected to the electronic device main body, the current consumption by the voltage converter 11 can be reduced, and the consumption of the voltage converter 11 is performed when the main body is off. The current can be reduced. Furthermore, in the sixth embodiment, when the secondary battery temperature or the voltage converter temperature becomes abnormally high, the power supply of the voltage converter is turned off and the discharge is stopped. As a result, the battery pack can be prevented from rising in temperature.

  The present invention is not limited to the above-described embodiment of the present invention, and various modifications and applications are possible without departing from the spirit of the present invention. For example, the number of voltage converters built in the battery pack is not limited to one and may be two or more. Moreover, even if it is one voltage converter, you may use the voltage converter of the structure which produces | generates several mutually different output voltages. In addition to the signal whose voltage value changes according to the power on / off of the electronic device main body, the activation signal includes a signal whose current value changes, a signal whose pulse width changes, and a signal whose digital signal code changes Various signals such as can be used. Furthermore, the present invention can be configured without a protection circuit.

It is a basic diagram which shows the structure of the 1st example of the battery pack to which this invention was applied. It is a basic diagram which shows the internal structure of the 1st example of a battery pack. It is a connection diagram of a 1st embodiment of this invention. It is a connection diagram of the second embodiment of the present invention. It is a basic diagram which shows the structure of the 2nd example of the battery pack to which this invention was applied. It is a basic diagram which shows the internal structure of the 2nd example of a battery pack. It is a connection diagram of a 3rd embodiment of this invention. It is a connection diagram at the time of implement | achieving the switch of 3rd Embodiment of this invention by FET. It is a connection diagram of a 4th embodiment of this invention. It is a basic diagram which shows the structure of the 3rd example of the battery pack to which this invention was applied. It is a connection diagram of a 5th embodiment of this invention. It is a basic diagram which shows the structure of the 4th example of the battery pack to which this invention was applied. It is a connection diagram of a 6th embodiment of this invention.

Explanation of symbols

1A, 1B, 1C, 1D Battery pack 2 Secondary battery 6, 7, 8, 31 External terminal 9 Case 11 Voltage converter 12 Switch for discharge current 13 Switch for charging current 16 Protection circuit 19 Power switch 20 Power supply control for voltage converter Signals 21, 32, 33, 38, 42 Voltage converter power supply controller 22 AND operator 34 Overdischarge non-detection signal 35 Battery temperature sensor 37 Battery temperature abnormality detection signal 39 Voltage converter temperature sensor 41 Voltage converter temperature abnormality detection signal

Claims (17)

In battery packs with built-in secondary batteries,
One or more voltage converters;
A plurality of output terminals for outputting two or more different voltages;
A battery pack comprising: power supply control means for detecting whether or not the secondary battery is operating normally and turning on / off the power supply of the voltage converter according to a detection result. In claim 1,
A battery pack in which the voltage converter is housed in a case together with the secondary battery. In claim 1,
A battery pack in which the voltage converter is housed in the secondary battery. In claim 1,
A battery pack further comprising a protection circuit for the secondary battery. In claim 1,
The battery pack, wherein the power control means determines that the secondary battery is operating normally when the voltage of the secondary battery is equal to or higher than a set voltage. In claim 1,
The battery pack, wherein the power control means determines that the secondary battery is operating normally when the voltage of the secondary battery is equal to or lower than a set voltage. In claim 1,
The battery pack, wherein the power control means determines that the secondary battery is operating normally when the temperature of the secondary battery or the vicinity of the secondary battery is equal to or lower than a set temperature. In battery packs with built-in secondary batteries,
One or more voltage converters;
A plurality of output terminals for outputting two or more different voltages;
A battery pack comprising: power supply control means for detecting whether or not the voltage converter is operating normally and turning on / off the power supply of the voltage converter according to a detection result. In claim 8,
A battery pack in which the voltage converter is housed in a case together with the secondary battery. In claim 8,
A battery pack in which the voltage converter is housed in the secondary battery. In claim 8,
A battery pack further comprising a protection circuit for the secondary battery. In claim 8,
The battery pack, wherein the power control means determines that the voltage converter is operating normally when the temperature of the voltage converter or the vicinity of the voltage converter is equal to or lower than a set temperature. In battery packs with built-in secondary batteries,
One or more voltage converters;
A plurality of output terminals for outputting two or more different voltages;
An input terminal to which an activation signal indicating whether or not the output of the voltage converter is required is input;
A battery pack having power control means for turning on / off the power of the voltage converter in response to the activation signal. In claim 13,
A battery pack in which the voltage converter is housed in a case together with the secondary battery. In claim 13,
A battery pack in which the voltage converter is housed in the secondary battery. In claim 13,
A battery pack further comprising a protection circuit for the secondary battery. In claim 13,
The activation signal is supplied from an electronic device, and is a signal that changes according to the power on / off of the electronic device,
A battery pack, wherein the power control means controls the power of the voltage converter to be on when the power of the electronic device is on.

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