WO2014148228A1 - 電池パック及び電気機器 - Google Patents
電池パック及び電気機器 Download PDFInfo
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- WO2014148228A1 WO2014148228A1 PCT/JP2014/055094 JP2014055094W WO2014148228A1 WO 2014148228 A1 WO2014148228 A1 WO 2014148228A1 JP 2014055094 W JP2014055094 W JP 2014055094W WO 2014148228 A1 WO2014148228 A1 WO 2014148228A1
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- battery pack
- electric device
- main body
- signal
- power
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/581—Devices or arrangements for the interruption of current in response to temperature
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a battery pack and an electric device that operates on the battery pack.
- a so-called cordless power tool using a rechargeable battery pack as a power source is widely used.
- a battery pack usually includes a cell set in which a plurality of battery cells are connected in series, and a lithium ion battery is mainly used as a battery type.
- a battery pack using a lithium ion battery incorporates a protection IC for monitoring the voltage of each battery cell or voltage monitoring means having the same function. If any battery cell is short-circuited or the voltage of the battery cell has reached the threshold value for overdischarge, an alarm signal is output from the protection IC and the use of the battery pack is stopped in response to this. This is to make it happen.
- a power tool premised on the use of a battery pack with a built-in protection IC uses a switching element composed of an FET or the like provided in a current path flowing from the battery pack to the motor in the power tool as an alarm signal output from the protection IC. It is configured to be turned off in response to forcibly terminating the use of the battery pack (see, for example, Patent Document 1).
- the battery pack 2 includes a switch operation detection circuit 36.
- the switch 10 provided in the power supply path of the electric device main body 1 When the switch 10 provided in the power supply path of the electric device main body 1 is operated, an operation signal notifying that the switch 10 has been operated is output to the battery pack 2 via the S terminal.
- the MCU 31 provided in the battery pack 2 detects that the switch 10 has been operated by the switch operation detection circuit 35, the MCU 31 outputs a discharge permission signal for permitting discharge to the electric device body 1 via the S terminal.
- the drive circuit 23 transmits the discharge permission signal to the switching element 24 provided in the power supply path, and power supply to the motor 40 is started through the power supply path.
- the battery pack 2 includes a monitoring circuit including a current detection circuit 32, a voltage detection circuit 33, a temperature detection circuit 34, and an MCU 31.
- the MCU 31 When an abnormality occurs in the cell set 3, the MCU 31 outputs a stop signal for cutting off power supply to the S terminal.
- the electrical device main body 1 When a stop signal is input from the S terminal, the electrical device main body 1 outputs a stop signal from the drive circuit 23 to the switching element 24 to cut off power supply.
- FIG. 7 shows a state in which the battery pack is connected to such an electric device main body 1.
- an operation signal notifying that the switch 10 has been operated is not input from the electric device body 1, but since there is no switching element 24 that cuts off the power supply circuit inside the electric device body 1, even the switch 10 is operated.
- the power supply circuit becomes conductive and power supply is started.
- the electric device main body as shown in FIG. 6 and the electric device main body as shown in FIG. 7 are configured to be able to cut off the power supply when the cell set is abnormal even when connected to either of them.
- a battery pack was not provided. In recent years, the capacity of cells has been increased. However, when a cell with a capacity exceeding a certain level is used, the Electrical Appliance and Material Safety Law stipulates that the power supply is cut off when the cell set is abnormal. When it is intended to develop a battery pack having a large capacity that can be used in any of the electric device main bodies shown in FIGS. 6 and 7, that is, it is necessary to solve this first problem.
- the abnormality is detected only by the monitoring circuit provided in the battery pack 2 and the power supply is reduced or cut off, but the connected electric device main body 1 has a high output.
- the battery pack 2 is connected to the low load type electric device main body, it is slow to reduce or cut off the power supply after the abnormality of the cell set 3 occurs, rather the electric device main body abnormality occurs first. It may be appropriate to reduce or cut off the power supply earlier.
- the second problem arises that not only the battery pack but also the electric device main body should be protected. *
- the S terminal which is a signal terminal for connecting the battery pack and the power tool
- the power cannot be correctly switched on / off.
- a battery pack with an inappropriate rated voltage or the like is connected to the power tool, there is a third problem that the power cannot be turned off on the power tool side.
- An object of this invention is to provide the battery pack which can solve at least any one of the problem mentioned above, and an electric equipment provided with the same.
- the present invention provides a battery pack that is detachably connected to an electric device body having a switch, and permits the supply of electric power to the electric device body when the switch is operated.
- a first power control circuit that outputs a first signal to the electric device main body, a second switching element provided in a power supply path for supplying electric power to the electric device main body, and the battery pack And a second power control circuit for outputting to the second switching element a second signal for reducing or cutting off the power supplied to the main body of the electric device when an abnormality occurs.
- a battery pack is provided. *
- the battery pack When the first signal is input, the battery pack may be connected to the electric device main body provided with a first switching element that permits power supply in a power supply path.
- the battery pack may be connected to the electric device main body that permits supply of power when the switch is operated.
- Third power control for outputting a third signal for reducing or cutting off the power supplied to the third switching element provided in the power supply path via the power supply path when an abnormality occurs in the electric device main body. You may connect this battery pack to this electric equipment main body provided with the circuit. *
- the present invention is an electrical device in which a battery pack is connected to the electrical device main body, and when an abnormality occurs in at least one of the electrical device main body or the battery pack, a third power supply path is provided.
- the electric device main body including a third power control circuit that outputs a third signal for reducing or cutting off the electric power supplied to the switching element via the electric power supply path, and an abnormality in the electric device main body or the battery pack
- a battery pack including a second power control circuit that outputs a second signal for reducing or blocking power supplied to the second switching element provided in the power supply path via the power supply path
- an electric device characterized by comprising: *
- the electric device main body and the battery pack can reduce or cut off the power supply. Even if a contact failure occurs in a terminal that transmits a signal between the device main body and the battery pack, it is possible to escape from an abnormal state at an early stage. That is, the second problem described above can be solved.
- a reference for switching whether or not to output the third signal in the electric device main body and a reference for switching whether or not to output the second signal in the battery pack may be different from each other.
- the electric device main body and the battery pack can control power supply interruption or stop based on different standards, for example, a high-load type electric device main body including a high-output motor or the like
- a high-load type electric device main body including a high-output motor or the like When a battery pack is connected to the battery pack, the reference for shutting off or stopping the power supply from the electric device body is set relatively high, and the reference for shutting off or stopping the power supply from the battery pack is set relatively low.
- the electric power can be supplied to the main body of the electric device up to the limit that the battery pack can output, and a high-load operation can be performed.
- a reference for cutting off or stopping power supply from the electric device main body is set relatively low, and the battery pack is By setting the reference for cutting off or stopping the power supply to be relatively high, it is possible to avoid exceeding the power that can be withstood by the lamp of the main body of the electric appliance. That is, the second problem described above can be solved.
- the present invention provides a connection unit connected to a secondary battery, a blocking unit that blocks current from the secondary battery, a state monitoring unit that monitors a state of the secondary battery, and a state monitoring unit.
- a connection unit connected to a secondary battery
- a blocking unit that blocks current from the secondary battery
- a state monitoring unit that monitors a state of the secondary battery
- a state monitoring unit that monitors a state of the secondary battery
- an electric device characterized by having foreseeing an abnormality based on a monitoring result and determining means for cutting off a current from the secondary battery when the abnormality is foreseen.
- the electric device independently predicts an abnormality originating from the battery pack regardless of the battery pack, and can appropriately cut off the power. That is, the third problem described above can be solved.
- the secondary battery has a predetermined rated value, and the judging means compares the predetermined value based on the rated value of the secondary battery with the monitoring result of the state monitoring means, thereby detecting an abnormality. It is preferable to judge. According to such a configuration, abnormality of the secondary battery can be properly predicted.
- the determination unit determines an abnormality by comparing a predetermined value based on a rated value of the electric device with a monitoring result of the state monitoring unit.
- an electric current can be interrupted
- the state monitoring unit preferably monitors at least one of a current supplied from the secondary battery and a voltage applied by the secondary battery.
- the motor further includes a rated value of the electrical device that is a rated voltage of the motor, and the determination unit determines that the voltage applied from the secondary battery is outside the rated voltage range of the motor.
- the current from the secondary battery to the motor is preferably interrupted by the interrupting means.
- the motor further includes a rated value of the electric device that is a rated current of the motor, and the determination unit determines that the current supplied from the secondary battery is outside the rated current range of the motor.
- the current from the secondary battery to the motor is preferably interrupted by the interrupting means.
- the secondary battery outputs an alarm signal to notify the warning based on its own state to the connection means, and the determination means outputs a current to the interruption means when the connection means inputs the alarm signal. It is preferable that the interruption means not cut off the current when the monitoring result of the state monitoring means does not predict an abnormality and the alarm signal is not received. According to such a configuration, the current can be appropriately interrupted based on the determination result of the determination means and the alarm signal.
- a battery pack that solves at least one of the first to third problems described above and an electric device including the battery pack can be provided.
- FIG. 1 is a block diagram showing an electrical configuration of a battery pack and an electric device main body according to a first embodiment of the present invention. It is the block diagram which showed the electrical structure of the battery pack and electric equipment main body by the 2nd Embodiment of this invention. It is the block diagram which showed the electrical structure of the battery pack and electric equipment main body by the 3rd Embodiment of this invention. It is the block diagram which showed the electrical structure of the battery pack and electric equipment main body by the 4th Embodiment of this invention. It is the block diagram which showed the electrical structure of the battery pack and electric equipment main body by the conventional 1st example. It is the block diagram which showed the electrical structure of the battery pack and electric equipment main body by the conventional 2nd example.
- FIG. 1 is a view showing a state in which a battery pack 2 having a three-terminal configuration, which will be described later, which is a secondary battery, and a monitoring-compatible power tool body 1 are mounted.
- the electric tool main body 1 includes a motor 40 and a controller 20, and a switching element such as an FET is inserted in a current path through which a current flows to the motor 40.
- a switching element such as an FET is inserted in a current path through which a current flows to the motor 40.
- an S terminal for inputting an alarm signal is formed on the battery pack connection surface.
- the tool-side S terminal is a terminal for inputting an alarm signal output from the battery pack 2 when at least one cell voltage reaches a threshold value for reaching an overdischarge state.
- the power tool body 1 is provided with a trigger switch 10 for driving the power tool. *
- the battery pack 2 monitors the voltage of each battery cell 3 in which a plurality of cells are connected in series, and an alarm when the voltage of at least one of the battery cells falls below a reference value.
- a controller 30 as battery voltage monitoring means for outputting a signal is incorporated.
- the plus terminals and the minus terminals are electrically connected to each other, and the S terminal of the battery pack 2 and the S terminal on the tool body side are also electrically connected. Connected to.
- the S terminal on the tool body 1 side is connected to the controller 20.
- the controller 20 turns off the FET, opens the current path, and forcibly terminates the use of the battery pack 2.
- FIG. 2 is a block diagram showing an electrical configuration of the battery pack 2 and the power tool main body 1.
- the cell set 3 has a plurality of battery cells such as lithium ions connected in series. Although omitted in FIG. 2, a plurality of cell sets 3 may be connected in parallel. Examples include a battery pack 2 of 14.4V in which 4 series of battery cells having a rated voltage of 3.6V are in series, and a battery pack 2 having 5 series of battery cells in which the rated voltage is 3.6V. Further, the battery capacity of the battery pack 2 is determined according to the battery capacity per cell and the number of the cell sets 3 arranged in parallel.
- 3.0Ah battery cells having two 1.5A cell groups arranged in parallel per battery cell for example, 3.0Ah battery cells having two 1.5A cell groups arranged in parallel per battery cell, or 4.0Ah battery cells having two 2.0A cell groups arranged in parallel. Use one.
- the number of cell groups and the capacity per battery cell are not limited to these.
- the battery pack 2 further includes a control unit 30, and the control unit 30 includes a micro-computing unit 31 (hereinafter referred to as “MCU 31”) as a controller, and each of the cells constituting the cell set 3.
- the battery cell voltage is detected.
- the battery pack 2 includes a current detection circuit 32, a voltage detection circuit 33, a temperature detection circuit 34, a charger detection circuit 35, a drive circuit 38, and an FET 39.
- the current detection circuit 32 detects a current flowing from the battery pack 2 to the power tool main body 1 and is configured by a shunt resistor.
- the voltage detection circuit 33 is a circuit that detects the voltage of the battery pack 2 from the divided voltage values of two resistors connected in parallel with the battery pack 2.
- the temperature detection circuit 34 is a circuit that detects the temperature of the cell set 3 by a temperature sensitive element such as a thermistor that is in contact with or close to the battery pack 2. *
- the charger detection circuit 35 connects the battery pack 2 to the charger according to the voltage input from the charger side via the charger connection terminal. It is a circuit for detecting that the *
- the battery pack 2 is formed with at least four terminals of the charger connection terminal, plus terminal, minus terminal, and S terminal.
- the plus terminal, minus terminal Since only the three terminals of the terminal and the S terminal are connected to the corresponding terminals of the electric power tool main body 1, for convenience of explanation, the battery pack 2 as shown in FIG. 2 is referred to as a three-terminal battery pack.
- the charger connection terminal and the S terminal are integrally formed. *
- various detection signals from the current detection circuit 32, the voltage detection circuit 33, the temperature detection circuit 34, and the charger detection circuit 35 are input to the MCU 31 built in the battery pack 2. Is done. A discharge control signal is output from the MCU 31 based on these detection signals. The discharge control signal is applied to the gate of the FET 37, and the drain potential of the FET 37 becomes the S terminal output.
- the control unit 30 is further provided with a SW operation detection circuit 36 that detects whether or not the operator has turned on the trigger switch 10 of the electric power tool body 1 and inputs the detection result to the MCU 31. Specifically, when the operator turns on the trigger switch 10, the battery pack 2 and the power tool body 1 are electrically connected. That is, a current path is formed in which the plus terminal of the battery pack 2, the plus terminal on the electric tool body 1 side, the motor 40, the minus terminal on the electric tool body 1 side, and the minus terminal on the battery pack 2 side are connected. When the current path is formed, the reference voltage Vcc generated using the cell set 3 as a power source on the battery pack 2 side is applied to the electric tool body 1 side.
- a resistor set 22 in which three resistors R1, R2 and R3 are connected in series between Vcc and ground is provided on the power tool body 1 side, and the divided voltage values of R2 and R3 are passed through the S terminal. Is applied to the SW operation detection circuit 36, and the fact that the trigger switch 10 is turned on is transmitted from the SW operation detection circuit 36 to the MCU 31. When the trigger switch 10 is off, the voltage input to the SW operation detection circuit 36 via the S terminal of the battery pack 2 is lower than the voltage input when the trigger switch 10 is on (ground potential). It becomes. *
- the MCU 31 When the trigger switch 10 is turned on, the MCU 31 outputs a high level discharge control signal to the FET 37.
- the signal is at a high level, and the FET 37 is on. Therefore, a low level (ground potential) signal is output from the S terminal on the battery pack side to the tool body side.
- the MCU 31 switches the discharge control signal, which has been at a high level to a low level, when an abnormality is foreseen, while the electric tool can be driven or is being driven. Foreseeing an abnormality also means detecting that the battery pack or electrical device itself has reached an abnormal state that would result in damage, but it is approaching damage even if it has not yet been damaged.
- the reference value is a threshold value that causes an overdischarge state when the voltage further decreases, and for example, 2.0 V per cell is set as the reference value.
- the discharge control signal goes low as described above. This signal corresponds to an alarm signal output from the MCU 31 serving as battery voltage monitoring means.
- the discharge control signal becomes low level, the FET 37 is turned off, and the voltage at the S terminal becomes equal to the potential higher than the ground level, that is, the divided voltage values of the resistors R1, R2, and R3 on the tool body side.
- the MCU 31 controls the FET 39 via the drive circuit 38.
- the MCU 31 turns off the FET 39 when an abnormality is predicted, and turns on the FET 39 in other states. More specifically, when the voltage is in a normal state for any of the cells constituting the cell set 3, the MCU 31 turns on the FET 39 so that the power from the battery set 3 can be output.
- the power tool body 1 has been at a high level until then. The discharge control signal becomes low level.
- the MCU 31 may turn off the FET 39 and set the discharge control signal to a low level. This is because if the current value is larger than the predetermined current value, the electric power tool body 1 may be damaged.
- the FET 39 may be PWM controlled by the drive circuit 38 to reduce the effective current. In this way, the output power can be reduced.
- a lower limit may be provided for the current value, and when the current value falls below the lower limit value, the MCU 31 may turn off the FET 39 and set the discharge control signal to a low level.
- the electric tool body 1 is provided with a control unit 20.
- the control unit 20 incorporates a micro computing unit 25 (hereinafter referred to as “MCU-2”) as a controller.
- the control unit 20 is further provided with a control power supply circuit 21, a voltage detection circuit 26, a current detection circuit 27, and a resistor set 22.
- the control power supply circuit 21 is provided on the downstream side of the switch 10 and converts the power from the battery pack 1 when the switch 10 is turned on, whereby the control voltage Vcc is applied to the MCU-2 and the resistor set 22. Is applied. *
- the voltage detection circuit 26 detects the voltage applied to the motor 40 from the divided values of the two resistors connected in parallel with the motor 40, and inputs the detection result to the MCU-2.
- the current detection circuit 27 includes a shunt resistor and the like, detects a current flowing through the motor 40, and inputs a detection result to the MCU-2.
- a reverse-biased diode 41 is connected in parallel with the motor 40 and provides a current path for a current flowing in a direction opposite to the current flowing in the motor 40. *
- the control unit 20 is provided with an FET 24 inserted in the current path and a drive circuit 23 for driving the FET 24.
- An output signal from the MCU-2 is applied to the drive circuit 23 via the diode 28, and the divided values of the resistors R1, R2 and R3 are applied via the diode 29.
- the drive circuit 23 outputs a high level signal to turn on the FET 24.
- power from the battery pack 2 is supplied to the motor 40.
- the drive circuit 23 outputs a low level signal to turn off the FET 24.
- the S terminal When the operator turns on the switch 10 and the discharge control signal of the battery pack 2 is at a high level, the S terminal is at a low level, and the diode 29 outputs a low level signal to the drive circuit 23. On the other hand, when the switch 10 is turned on and the discharge control signal is at a low level, the S terminal is at a high level, and the diode 29 outputs a high level signal to the drive circuit 23.
- the MCU-2 Based on the voltage value detected by the voltage detection circuit 26 and the current value detected by the current detection circuit 27, the MCU-2 outputs a high level signal to the drive circuit 23 as an alarm signal when an abnormal state is predicted. MCU-2 turns off the FET 24 via the drive circuit 23 and stops driving the electric power tool.
- the MCU-2 predicts an abnormal state based on the detection result of the voltage detection circuit 26
- the voltage value is smaller than the first threshold value or larger than the second threshold value.
- the second threshold value is larger than the first threshold value.
- the first threshold value is a voltage value at which the battery cells of the battery set 3 are overdischarged when the voltage drops below that.
- the first threshold value is determined based on the battery pack 2 having a rated voltage corresponding to the power tool body 1. For example, as described above, in the battery pack 2, it is determined that the battery is overdischarged when the cell voltage is reduced to 2.0V. Therefore, the first threshold value is set to a value TH1 obtained by multiplying the threshold value 2.0V by the number n of cells connected in series.
- the judgment standard here, the threshold value
- the determination criteria may be different between the electric power tool body 1 and the battery pack 2.
- the first threshold value may be set to a value different from TH1, such as the lower limit value of the voltage value at which the power tool body 1 can operate without considering the battery pack 2.
- TH1 the lower limit value of the voltage value at which the power tool body 1 can operate without considering the battery pack 2.
- the motor 40 when the motor 40 is a brushless motor, the motor 40 may be damaged when a voltage lower than the rated voltage is applied. If this lower limit value is set as the first threshold value, it is possible to prevent the motor 40 from being damaged. That is, the first threshold value may be set in consideration of the rated voltage of the electric power tool body 1. *
- the first threshold value may be set so as to change according to the current during discharge, that is, to have current dependency.
- the electric power tool body 1 outputs a large current when a high load is applied, but at this time, the voltage rapidly decreases.
- the first threshold value is made to depend on the current so that MCU-2 does not foresee an abnormality that may cause overdischarge, and the threshold value is set at the time of high current output (high load). Also to be lowered.
- the second threshold is determined based on the upper limit value of the allowable voltage (rated voltage) of the electric power tool body 1. For example, the second threshold value is set so that the voltage value applied to the motor 40 does not exceed the rated voltage of the motor 40.
- the second threshold value may also have current dependency. *
- the MCU-2 predicts an abnormal state based on the current detection circuit 27, a state where the current value is smaller than the third threshold and overdischarge is expected, and the current value is the fourth value.
- the rated current of the battery pack 2 mounted is larger than the threshold value and larger than the rated current of the electric power tool body 1.
- the fourth threshold is larger than the third threshold.
- the third and fourth threshold values may have voltage dependency.
- FIG.1 and FIG.2 The example shown in FIG.1 and FIG.2 is a case where a battery pack 2 is a 14.4V output type when a three-terminal configuration battery pack is mounted on a monitoring-compatible power tool body.
- the rated voltage is also 14.4 V, the voltage monitoring of the battery cell can be performed appropriately, so there is no problem in using the electric tool by such a combination.
- the voltage value is determined from the output result from the voltage detection circuit 26 provided in the power tool body 1. It is determined that the value is larger than the second threshold value, and MCU-2 can turn off the FET 24 via the drive circuit 23 and prohibit the use of the power tool.
- the FET 24 is PWM-controlled, and the duty ratio is adjusted so that the effective value of the voltage becomes the rated voltage of the electric power tool body 1. Even if a battery pack 2 having a higher rated voltage than the rated voltage of the electric power tool body 1 is attached, the electric power tool body 1 can be operated.
- the MCU 31 when an abnormality is predicted, the MCU 31 can instruct the electric power tool main body 1 to interrupt the current path of the electric power tool main body 1 by the discharge control signal, and the drive circuit 38 can be turned on.
- the FET 39 can be turned off, and the output of the battery pack 2 can be cut off or reduced.
- the battery pack 2 and the power tool 2 can independently cut off or reduce power. Thereby, the lifetime of the battery pack 2 can be extended.
- the electric power tool main body 1 has the MCU-2, the voltage detection circuit 26, and the current detection circuit 27.
- the supply of electric power to the motor 40 can be cut off. For this reason, the burden on the battery cell can be reduced. Further, even when there is a contact failure in the S terminal and the alarm signal is not correctly output from the battery pack 2 side, the electric power tool body 1 can independently predict an abnormality.
- the power tool body 1 can uniquely set the first to fourth threshold values, not only the control according to the standard of the battery pack 2 but also the standard of the power tool body 1 (the rating of the motor 40). It is possible to perform control in consideration of voltage, rated current). As a result, the life of the electric power tool body 1 can be extended.
- the configuration of the electric power tool main body 1 of the second embodiment is the same as that of the first embodiment. Further, the second embodiment is different from the first embodiment in that the battery pack 2 does not have the drive circuit 38 and the FET 39. Therefore, in the second embodiment, as in the first embodiment, the MCU 31 outputs a low-level discharge control signal to the power tool body 1 when an abnormality is predicted. When the discharge control signal becomes low, the drive circuit 23 of the power tool body 1 cuts off or suppresses the supply of power to the motor 40 by turning off the FET 24. *
- the battery pack 2 reliably shuts off the supply of electric power to the motor 40 by the electric power tool main body 1 without the configuration of interrupting the electric power supply. Or it can be suppressed.
- the configuration of the battery pack 2 is the same as that of the first embodiment.
- the third embodiment is different from the first embodiment in that the electric power tool body 1 does not include the MCU-2, the voltage detection circuit 26, the current detection circuit 27, and the diode 28. Therefore, in the third embodiment, the MCU-2 does not foresee an abnormality, and the battery pack 2 makes the discharge control signal low, so that the potential of the S terminal becomes high, and the drive circuit 23 has a high level. Signal is input. As a result, the FET 24 is turned off, and the drive circuit 23 can cut off the supply of power to the motor 40. Further, the drive circuit 23 turns on the FET 24 when the S terminal becomes low level, and supplies power to the motor 40. *
- the electric power tool main body 1 of the third embodiment reliably shuts off the supply of electric power to the motor 40 without predicting the abnormality of the electric power input uniquely, or Can be suppressed.
- the configuration of the battery pack 2 is the same as that of the first embodiment.
- the power tool body 1 does not include the MCU-2, the voltage detection circuit 26, the current detection circuit 27, the resistor set 22, the drive circuit 23, the FET 24, and the S terminal. Is different from the first embodiment.
- the power tool main body 1 does not have a configuration for predicting an abnormality in the power supplied to itself, and further does not have a configuration for cutting off or suppressing the supply of power to the motor 40. Therefore, in the fourth embodiment, when the battery pack 2 predicts an abnormality, the power supply to the power tool main body 1 is interrupted or suppressed.
- the electric power tool main body 1 does not have a configuration for predicting an abnormality, and further has a configuration that interrupts or suppresses the supply of power to the motor 40. Even if it is not, the supply of electric power to the electric power tool body 1 can be surely cut off.
- the electric power tool main body 1 connected to the battery pack 2 is shown as an example.
- the device connected to the battery pack 2 is not limited to the electric power tool main body 1 and may be any electric device.
- a fan or a light may be used.
- the first signal recited in the claims is a discharge control signal
- the first power control circuit is the MCU 31
- the second switching element is the FET 39
- the second power control circuit is the drive circuit 38
- the third switching element is an FET 29
- the third power control circuit is MCU-2
- the third signal is a high level signal.
- the interruption means is the FET 24
- the state monitoring means is the voltage detection circuit 26 and the current detection circuit 27, and the determination means is MCU-2.
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- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Battery Mounting, Suspending (AREA)
- Protection Of Static Devices (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
Description
32 マイクロ・コンピューティング・ユニット
32 電流検出回路
33 電圧検出回路
38 ドライブ回路
39 FET
2 電池パック
26 電圧検出回路
27 電流検出回路
25 マイクロ・コンピューティング・ユニット
40 モーター23 ドライブ回路
24 FET
Claims (14)
- スイッチを有する電気機器本体に着脱可能に接続される電池パックであって、
該スイッチが操作されると該電気機器本体への電力の供給を許可するための第1の信号を該電気機器本体に対して出力する第1の電力制御回路と、
該電気機器本体に電力を供給する電力供給経路に設けられた第2のスイッチング素子と、
該電池パックに異常が生じると該電気機器本体に供給する電力を低減又は遮断するための第2の信号を該第2のスイッチング素子に出力する第2の電力制御回路と、
を備えたことを特徴とする電池パック。 - 該第1の信号が入力されると電力の供給を許可する第1のスイッチング素子を電力供給経路に備えた該電気機器本体に該電池パックを接続してなる請求項1記載の電気機器。
- 該第1の信号が入力されるか否かに関わらず該スイッチが操作されると電力の供給を許可する該電気機器本体に該電池パックを接続してなる請求項1記載の電気機器。
- 該電気機器本体に異常が生じると電力供給経路に設けられた第3のスイッチング素子に電力供給経路を経て供給される電力を低減又は遮断するための第3の信号を出力する第3の電力制御回路を備えた該電気機器本体に該電池パックを接続してなる請求項1記載の電気機器。
- 電気機器本体に電池パックを接続して成る電気機器であって、
該電気機器本体又は該電池パックの少なくともいずれかに異常が生じると電力供給経路に設けられた第3のスイッチング素子に電力供給経路を経て供給される電力を低減又は遮断するための第3の信号を出力する第3の電力制御回路を備えた該電気機器本体と、
該電気機器本体又は電池パックに異常が生じると電力供給経路に設けられた第2のスイッチング素子に電力供給経路を経て供給する電力を低減又は遮断するための第2の信号を出力する第2の電力制御回路を備えた該電池パックと、
を備えたことを特徴とする電気機器。 - 該電気機器本体において該第3の信号を出力するか否かを切り替える基準と、該電池パックにおいて該第2の信号を出力するか否かを切り替える基準とを、それぞれ異なる基準としたことを特徴とする請求項5記載の電気機器。
- 二次電池に接続される接続手段と、
前記二次電池からの電流を遮断する遮断手段と、
前記二次電池の状態を監視する状態監視手段と、
前記状態監視手段の監視結果に基づいて異常を予見し、異常を予見した場合に前記二次電池からの電流を遮断させる判断手段とを有することを特徴とする電気機器。 - 前記二次電池は、所定の定格値を有し、
前記判断手段は、前記二次電池の前記定格値に基づいた所定値と、前記状態監視手段の監視結果とを比較することにより、異常を判断することを特徴とする請求項7に記載の電気機器。 - 前記判断手段は、電気機器の定格値に基づいた所定値と、前記状態監視手段の監視結果とを比較することにより、異常と予見することを特徴とする請求項7に記載の電気機器。
- 前記状態監視手段は、前記二次電池から供給される電流と、前記二次電池よって印加される電圧との少なくとも一方を監視することを特徴とする請求項7乃至9に記載の電気機器。
- 前記判断手段は、前記監視手段が監視する電圧と電流との少なくとも一方が、前記二次電池の定格値に基づく所定の範囲外であると判断したときに、異常と予見することを特徴とする請求項10に記載の電気機器。
- モータをさらに有し、
電気機器の定格値は、前記モータの定格電圧であり、
前記判断手段は、前記二次電池から印加される電圧が前記モータの定格電圧範囲外であると判断したときに、前記二次電池から前記モータへの電流を前記遮断手段に遮断させることを特徴とする請求項10に記載の電気機器。 - モータをさらに有し、
電気機器の定格値は、前記モータの定格電流であり、
前記判断手段は、前記二次電池から供給される電流が前記モータの定格電流範囲外であると判断したときに、前記二次電池から前記モータへの電流を前記遮断手段に遮断させることを特徴とする請求項10に記載の電気機器。 - 前記二次電池は、自身の状態に基づいて警告を報知する警報信号を前記接続手段に出力し、
前記判断手段は、前記接続手段が前記警報信号を入力したときに、前記遮断手段に電流の遮断をさせ、前記遮断手段は、前記状態監視手段の監視結果が異常を予見せず、かつ、前記警報信号を受け取っていないときに電流の遮断を行わないことを特徴とする請求項7乃至13に電気機器。
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US14/773,692 US9893343B2 (en) | 2013-03-22 | 2014-02-28 | Battery pack and electric device |
EP14770752.5A EP2978100A4 (en) | 2013-03-22 | 2014-02-28 | CELL PACKAGE AND ELECTRICAL DEVICE |
JP2015506675A JP6098905B2 (ja) | 2013-03-22 | 2014-02-28 | 電池パック及び電気機器 |
CN201480013246.0A CN105009401B (zh) | 2013-03-22 | 2014-02-28 | 电池组和电气设备 |
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EP (1) | EP2978100A4 (ja) |
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US20160049636A1 (en) | 2016-02-18 |
US9893343B2 (en) | 2018-02-13 |
EP2978100A4 (en) | 2016-10-19 |
JP6098905B2 (ja) | 2017-03-22 |
CN105009401B (zh) | 2019-06-28 |
EP2978100A1 (en) | 2016-01-27 |
CN105009401A (zh) | 2015-10-28 |
JPWO2014148228A1 (ja) | 2017-02-16 |
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