JP2014072945A - Charging system, battery pack, and charging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charging system capable of notifying a charging condition of the battery pack itself to a charging device.SOLUTION: A battery pack 10 comprises: a battery group 11 chargeable by a charging device 100; a microcomputer 16 controlling charging of the battery group; and a battery-type discrimination element 15 notifying a signal indicating the type and configuration of battery cells of the battery group to the charging device. When attached to the charging device, the microcomputer 16 outputs a pulse signal indicating a charging condition of the battery group toward the charging device 100 by using the battery-type discrimination element 15, and then the charging device performs charging to the battery group 11 on the basis of the charging condition.

Description

  The present invention relates to a charging system, a battery pack, and a charging device.

  Various types of battery packs for cordless electric tools (voltage, battery capacity, battery type, etc.) are provided according to the variety of electric tools. Due to demands for high power and long-time use, built-in battery cells are mainly those that use lithium ion batteries, but other types of battery cells such as nickel-based positive secondary batteries were used. Many battery packs are still used. On the other hand, from the standpoint of the consumer, there is an increasing demand for a common charging device for these various battery packs. Therefore, so far, in order to optimally charge various types of batteries and connection forms with one charging device, the type of the battery cell is determined, and the charging device is determined according to the determination result. There has been proposed a method for selecting a preset optimum charge control (Patent Document 1).

JP 2009-178012 A

  However, in the above charging apparatus, the charge control method corresponding to the battery to be connected is determined in advance one-to-one. For this reason, for example, when a battery having suitable charging conditions different from the control predetermined for the charging device has been developed, there has been a problem that charging cannot be performed under the optimum conditions for the battery. Therefore, conventionally, every time a new battery is developed, it has been necessary to develop a charging device to which charging conditions for the new battery are added in order to optimally charge the battery.

  Therefore, an object of the present invention is to provide a charging system, a battery pack, and a charging device that can perform more optimal charging control using a connection terminal provided between the existing charging device and the battery pack.

  The charging system according to claim 1 is a charging system including a battery pack that is detachably connected to an electric tool, and a charging device that charges the battery pack. A secondary battery to be charged; battery pack control means for controlling charging of the secondary battery; and signal output means for outputting a signal representing information of the secondary battery, wherein the battery pack control means Generating a pulse signal representing a charging condition of the secondary battery and outputting the pulse signal from the signal output means, and the charging device controls signal input means connected to the signal output means and charging of the battery pack. Charging device control means, wherein the charging device control means sets the charging condition based on the pulse signal input to the signal input means and charges the secondary battery.

  According to the above configuration, when the battery pack is attached to the charging device, the pulse signal indicating the charging condition of the secondary battery is directed to the charging device via the signal output means for outputting the signal indicating the information of the secondary battery. Output. On the other hand, the charging device sets charging conditions for the secondary battery such as a charging voltage, a charging current, and a termination current based on the input pulse signal and charges the secondary battery. The charging conditions of the battery pack are provided from the battery pack to the charging device at the time of connection. Therefore, the charging device only needs to charge the battery pack based on the input information, and specialized for each battery pack in advance. There is no need to have a dedicated charging program. In addition, since the battery pack provides its own charging information to the attached charging device, the battery pack is charged under charging conditions suitable for the battery pack even if it is not a dedicated charging device.

  The charging system according to claim 2 is the charging system according to claim 1, wherein the signal representing the information of the secondary battery represents the type, number, and connection form of the battery cells constituting the secondary battery. The charging condition of the secondary battery is at least one of the charging method, charging voltage, charging current, charging time, termination current, charging capacity, charging / discharging history information, and precharging conditions of the secondary battery. It is characterized by being one. Here, “precharge” refers to a method in which preliminary charging is performed under conditions such as a small output voltage and current, and main charging is performed under conditions suitable for the secondary battery according to the result of the charging. It is a charge control means.

  With this configuration, a signal output unit that outputs a signal indicating the type, number, and connection form of the battery cells that constitute a secondary battery included in most battery packs, and a signal input unit that receives the signal included in the charging device. The pulse signal indicating the charging condition of the secondary battery can be sent from the battery pack to the charging device, so there is no need to provide a dedicated means for transmitting or receiving the pulse signal, and the battery pack or charging The apparatus can be made small and compact.

  The charging system according to claim 3 is the charging system according to claim 1 or 2, wherein the signal output unit and the signal input unit include a battery type identification element, a temperature detection element of the battery pack, or A signal is handled through a terminal connected to at least one element of the overcharge detection element. With this configuration, the signal can be exchanged between the battery pack and the charging device using an existing signal line.

  The battery pack according to claim 4 of the present invention is a battery pack that is detachably connected to the electric power tool, a secondary battery that can be charged by a charging device, and a control unit that controls charging of the secondary battery; And a signal output means for outputting a signal representing information on the secondary battery to the charging device, and the control means outputs a pulse signal representing a charging condition of the secondary battery to the signal output means. Output to the charging device.

  According to the above configuration, when the battery pack is attached to the charging device, the control means uses the signal output means for outputting a signal representing the information of the secondary battery as the pulse signal indicating the charging condition of the secondary battery. Output to the charging device. Based on the input pulse signal, the charging device sets charging conditions for the secondary battery such as a charging voltage, a charging current, and a termination current, and charges the secondary battery in the battery pack. Since the battery pack itself provides charging conditions for the secondary battery as a pulse signal to the charging device, the charging device only needs to charge the battery pack based on the input information, and has a dedicated charging program in advance. There is no need. Therefore, the battery pack is charged without using a dedicated charging device for the battery pack.

  In addition, since a signal output means for outputting a signal representing information on the secondary battery included in most battery packs is used to transmit a pulse signal representing information on the charging condition of the secondary battery to the charging device. There is no need to provide a dedicated output line, and the battery pack can be made compact.

  The battery pack according to claim 5 is the battery pack according to claim 4, wherein the signal representing the information of the secondary battery represents the type, number and connection form of the battery cells constituting the secondary battery. The charging condition of the secondary battery is at least one of the charging method, charging voltage, charging current, charging time, termination current, charging capacity, charging / discharging history information, and precharging conditions of the secondary battery. It is characterized by being one.

  With this configuration, a pulse signal representing the charging condition of the secondary battery using signal output means for outputting a signal representing the type, number, and connection form of the battery cells constituting the secondary battery included in most battery packs. Therefore, it is not necessary to provide a dedicated signal output means for outputting the pulse signal, and the battery pack can be made compact and compact.

  The battery pack according to claim 6 is the battery pack according to claim 4 or 5, wherein the signal output means includes a battery type identification element, a temperature detection element, or an overcharge detection provided in the battery pack. A signal is transmitted through a terminal connected to at least one element. With this configuration, the signal can be transmitted from the battery pack to the charging device using the existing signal line.

  The charging device according to claim 7, wherein the secondary battery and a battery pack having a terminal connected to the power tool can be charged, and a signal input unit that receives a signal representing information on the secondary battery. And the signal input means can receive a pulse signal generated by the battery pack and representing a charging condition of the battery pack, and the control means can receive the secondary signal based on the charging condition. The battery is charged.

  According to the above configuration, the charging device receives the charging condition of the battery pack such as the charging voltage and the charging current as a pulse signal from the attached battery pack through the signal output unit, and thus charging is performed based on the charging condition. Set the voltage, charging current, etc. to charge the battery pack. Therefore, the charging device does not need to have a preset charging program, and can optimally charge an appropriate battery pack that is mounted. The charging device can charge battery packs having various specifications.

  The charging device according to claim 8 is the charging device according to claim 7, wherein the signal representing the information on the secondary battery represents the type, number, and connection form of the battery cells constituting the secondary battery. The control means, based on the type, number and connection form of the battery cells, the charging method, charging voltage, charging current, charging time, termination current, charging capacity, charging / discharging of the secondary battery. The secondary battery is charged by setting at least one of history information and a precharge condition as the charge condition.

  With this configuration, a secondary battery can be obtained by using a signal input means (terminal) to which a signal indicating the type, number, and connection form of battery cells constituting a secondary battery conventionally provided in a charging device is input. Therefore, it is not necessary to provide a dedicated signal input means for inputting the charging condition, and the charging device can be made compact and compact.

  The charging device according to claim 9 is the charging device according to claim 7 or 8, wherein the signal input means includes a battery type identification element, a temperature detection element, or an overcharge detection provided in the battery pack. A signal is received through a terminal connected to at least one element of the element. With this configuration, the charging device can receive the signal from the battery pack using the existing signal line.

  ADVANTAGE OF THE INVENTION According to this invention, a battery pack can be charged on conditions suitable for a battery pack with a general purpose charging device.

It is a circuit diagram which shows the charge system which is embodiment of this invention. It is a time chart which shows the pulse signal sent to a charging device from a battery pack, when charging with the charging system of FIG.

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

  FIG. 1 shows a charging system 1 according to the present invention. The charging system 1 includes a battery pack 10 and a charging device 100 that charges the battery pack 10.

  The battery pack 10 includes a battery set 11 as a secondary battery, a protection IC 12, a switching IC 13, a temperature detection element 14, a battery type determination element 15, a battery side microcomputer 16, and an overcharge signal input in the main body. A unit 17, a battery type determining element opening means 18, and a battery type determining element shorting means 19 are provided.

  The battery set 11 includes one or more battery cells such as a lithium ion battery. When the battery set 11 includes a plurality of battery cells, a predetermined number of battery cells or a predetermined number of battery cells connected in parallel are connected in series.

  The protection IC 12 monitors the voltage of each battery cell, and outputs an overcharge signal when it is determined that an abnormal state such as an overvoltage has occurred in at least one of the battery cells.

  The battery type discriminating element 15 includes a resistance element having a specific resistance value corresponding to the number of battery cells constituting the battery set 11 and the connection form thereof. When the battery pack 10 is attached to the charging device 100, one end of the battery type determination element 15 is electrically connected to the charging device 100 via the terminal T4 to form an electrical circuit with the charging device 100. .

  The temperature detection element 14 is formed of a thermistor and is disposed in contact with or close to the battery set 11, and the resistance value changes according to the battery temperature in the battery pack 10. When the battery pack 10 is attached to the charging device 100, one end of the thermistor 14 is connected to the charging device 100 via the terminal T <b> 3 to form an electrical circuit with the charging device 100.

  The switching IC 13 is turned on / off by a signal sent from the terminal T5, and controls power feeding to the battery side microcomputer 16.

  The battery type discriminating element opening means 18 includes a switching element connected between the other end of the battery type discriminating element 15 and GND. The battery type discriminating element opening means 18 is normally in an on state, and connects the other end of the battery type discriminating element 15 and GND. However, the battery type discriminating element opening means 18 maintains the OFF state for a predetermined period d1 by the signal input from the battery side microcomputer 16.

  The battery type discriminating element shorting means 19 is composed of a switching element connected between one end of the battery type discriminating element 15 and GND. The battery type discriminating element shorting means 19 is normally in an off state. However, the battery type discriminating element shorting means 19 is turned off for a predetermined period d2 by a signal input from the battery side microcomputer 16, and the battery type discriminating element 15 is short-circuited.

  The battery side microcomputer 16 controls on / off of the battery type discriminating element opening means 18 and the battery type discriminating element shorting means 19. Normally, the battery side microcomputer 16 keeps the battery type discriminating element opening means 18 on and keeps the battery type discriminating element short means 19 off. Therefore, when the battery pack 10 is attached to the charging device 100, the battery type determination element 15 forms an electric circuit together with the charging device 100.

Moreover, the battery side microcomputer 16 has a memory (not shown) inside, and the memory has a suitable charging method, charging voltage, charging current, charging time, termination current, charging capacity, charging / discharging for the battery pack 10. History information, precharge conditions, etc. are stored. For this reason, when the battery-side microcomputer 16 is attached to the charging device 100, the battery-side determining element opening means 18 and the battery-type determining element shorting means 19 are turned on / off in order to transmit the charging conditions to the charging apparatus. Thus, a pulse signal is output via the terminal T4. When the pulse signal 18 is turned off, a pulse p ₁ having a pulse width d ₁ and a level HIGH is generated. On the other hand, when 19 is turned on, a pulse p ₂ having a pulse width d ₂ and a level LOW is generated. In this embodiment, as the transfer signal, and which specifies a charge condition to notify the charging device 100 by the number of consecutive pulses p _2. Further, the charging device 100 is notified of a specific numerical value of the specified charging condition based on the number of consecutive pulses p ₁ generated after the charging condition is specified by the pulse p ₂ . In this way, the battery-side microcomputer 16 transmits the charging condition of the battery pack 10 to the charging device 100 via the terminal T4.

  Next, the charging device 100 will be described. The charging device 100 includes a primary side rectifier circuit 20, a main power supply circuit 30, a transformer 40, a secondary side rectifier circuit 50, a current control / setting circuit 60, a battery voltage detection circuit 70, and a voltage control / setting. A circuit 80, a feedback switching circuit 90, a constant voltage power circuit 110, a battery type discrimination circuit 120, a battery temperature / overcurrent detection circuit 130, a charging device side microcomputer 140, and a display means 150 such as an LED. I have.

  The primary side rectifier circuit 20 rectifies and outputs AC power supplied from the AC power source 21.

  The main power supply circuit 30 includes a switching IC 31, an FET 32, and a latch circuit 33. In the main power supply circuit 30, the output power to the primary side of the transformer 40 is adjusted by PWM control by the switching IC 31 and the FET 32. The latch circuit 33 forcibly ends the charging of the battery pack 10 by a signal output from the device-side microcomputer 140 via the coupler 34.

  The secondary side rectifier circuit 50 rectifies the pulse power output from the secondary side of the transformer 40 and supplies it to the battery pack 10.

  The current control setting circuit 60 sets the charging current of the battery pack 10 according to the signal from the device-side microcomputer 140, detects the charging current flowing through the battery pack 10, and outputs a corresponding signal based on the detected charging current. Output to the feedback switching circuit 90.

  The battery voltage detection circuit 70 detects the charging voltage of the battery pack 10.

  The voltage control setting circuit 80 controls the charging voltage of the battery pack 10 together with the potentiometer 81. The voltage control setting circuit 80 sets a charging voltage in accordance with a signal from the apparatus-side microcomputer 140 and outputs a corresponding signal to the feedback switching circuit 90.

  The feedback switching circuit 90 is connected to the main power supply 30 via the coupler 91 so that the charging voltage and charging current of the battery pack 10 are set to target values based on the output signals of the current control setting circuit 60 and the voltage control setting circuit 80. Output a signal.

  The constant voltage power supply circuit 110 includes an auxiliary power supply 111, a transformer 112, power supplies 113 and 114, a fan 115, and a regulator 116. The constant voltage power supply circuit 110 generates a DC voltage Vcc from the voltage output from the primary side rectifier circuit 20. Generated and supplied to the device-side microcomputer 140. The constant voltage power supply circuit 110 stops its operation in response to a signal sent from the device side microcomputer 140 via the coupler 117.

The battery type discriminating circuit 120 includes a resistance element 121 having a predetermined resistance value and an FET 122 that is turned ON / OFF by a microcomputer. When the FET 122 is OFF, the resistance element 121 is in a pull-up state. On the other hand, when the FET is ON, the potential is at the ground level, which corresponds to a state where the terminal T4 is short-circuited.
In addition, when the battery pack 10 is attached, the battery type determination circuit 120 transmits a pulse signal input via the terminal T4 to the input port P1 of the apparatus-side microcomputer 140. When battery pack 10 is not attached to charging device 100, DC voltage Vcc is input to input port P1.

  The battery temperature / overcharge detection means 130 inputs a temperature signal corresponding to the temperature of the battery pack 10 based on the resistance value of the thermistor 14 to the apparatus-side microcomputer 140, and when the overcharge signal is output from the battery pack 10, The signal is input to the device-side microcomputer 140.

  The display means 150 is made up of LEDs and is connected to the apparatus-side microcomputer 140. The display means 150 displays the state where the battery pack is not attached, being charged, or charged, by changing the emission color of the LED.

  First, the device-side microcomputer 140 determines the type, number, and connection form of the secondary battery of the battery pack 10 based on the signal input from the battery type determination circuit 120, and charges the main power supply circuit 30. Output a start signal. In addition, a signal corresponding to a charging condition such as a charging capacity, a charging voltage, an allowable current, and a termination current represented by a pulse signal from the battery pack 10 described later is output to the current control setting circuit 60 and the voltage control setting circuit 80. . Further, when the battery temperature / overcurrent detection circuit 130 detects a charging abnormality of the battery pack 10, the apparatus-side microcomputer 140 forcibly stops the charging of the battery pack 10. Depending on the embodiment, the apparatus-side microcomputer 140 measures the charging time and stops charging the battery pack 10 after a predetermined time has elapsed.

  The charging device 100 also includes a switch circuit 160 that switches on / off of power supply to the battery-side microcomputer 16 of the attached battery pack 10. The switch circuit 160 is turned on when the battery pack 10 is attached. When the switch circuit 160 is turned on, a DC voltage Vcc, that is, 5 V is applied to the battery side microcomputer 16 of the battery pack 10 via the terminal T5, and as a result, the battery side microcomputer 16 is activated.

Next, charging of the battery pack by the charging system will be described with reference to FIG. Before the start of charging of the battery pack 10, i.e., at time _{t 0} when the battery pack 10 is not attached to the charging apparatus 100, the charging device 100, the device-side microcomputer 140, emission of the LED of the display unit 150 to red And display that it is before charging. At the same time, the device-side microcomputer 140 monitors whether or not the battery pack 10 is attached. At time t _1, the battery pack 10 is attached to the charging device 100, the battery type determination device 15 of the battery pack 10 is connected resistive element 121 and electrically the battery type determination circuit 120 via the terminal T4 . At this time, in the battery pack 10, the battery type discriminating element opening means 18 is normally on and the battery type discriminating element shorting means 19 is off. A divided voltage value obtained by dividing the voltage is input to the apparatus-side microcomputer 140. This divided voltage value indicates a value corresponding to the type and number of battery cells of the attached battery pack 10 and the connection form. By inputting the divided voltage value, the charging apparatus 100 can recognize the attachment of the battery pack 10 and can know the type, number, and connection form of the battery cells of the attached battery pack 10.

  The device-side microcomputer 140 activates the battery-side microcomputer 16 by turning on the switch circuit 160 in response to the input of the divided voltage value.

Next, after a lapse of a predetermined time from time t ₁ , between time t ₂ and time t ₃ , the battery side microcomputer 16 turns on / off the battery type discriminating element opening means 18 to turn on the first number of pulse signals p. ₁ is generated. The first number of pulse signals p ₁ represents the charge capacity of the battery pack 10. If the 1 pulse signal p ₁ is 0.5 ampere hours, the charge capacity of the battery pack 10 is (0.5 ampere hours) × (number of pulse signals p ₁ ) depending on the number of continuous pulse signals p _1. Can be notified to the device-side microcomputer 140 via the terminal T4 and the input port P1.

Next, at time t ₃ , the battery-side microcomputer 16 generates a single pulse signal p ₂ by turning on / off the battery type discrimination element shorting means 19. Input to the device-side microcomputer 140 of the single pulse signal p ₂ is to notify the voltage information of the battery pack 10 by the number of pulse signals p ₁ to be subsequently inputted, and notifies the device-side microcomputer 140. After generating the single pulse signal _{p 2,} the battery-side microcomputer 16, the period from time _{t 4} to _{t 5,} and generates a pulse _{p 1} second plurality. When the 1 pulse signal p ₁ indicates a 0.1 V rise in the charging voltage, the terminal T 4 and the input port P ₁ are expressed as (0.1 V rise) × (number of pulse signals p ₁ ) depending on the number of consecutive pulses p _1. The charging device 100 can notify the device-side microcomputer 140 of the value of the voltage increase required for the charging voltage set in advance based on the battery type discriminating element 15.

Then, at time t _5, the battery-side microcomputer 16 is generated by two consecutive pulse signals p ₂ by turning on and off of the battery type determination device shorting means 19. The input to two consecutive pulse signals p ₂ of the device-side microcomputer 140, the number of pulse signals p ₁ to be subsequently inputted to notice the device-side microcomputer 140 to notify the allowable current of the battery pack 10. After generation of the two pulse signals _{p 2,} the battery-side microcomputer 16 is, during the period from the time _{t 6} to _{t 7,} to generate a third plurality of pulses _{p 1.} When one pulse signal p ₁ indicates an allowable current of 0.5 A, the number of continuous pulses p ₁ is (0.5 A) × (number of pulse signals p ₁ ) via the terminal T4 and the input port P1. Thus, the value of the allowable current of the battery pack 10 can be notified to the device-side microcomputer 140.

Next, at time t ₇ , the battery-side microcomputer 16 continuously generates three pulse signals p ₂ by turning on / off the battery type determining element shorting means 19. The input to three successive pulse signals p ₂ of the device-side microcomputer 140, the number of pulse signals p ₁ to be subsequently inputted to notice the device-side microcomputer 140 to notify the termination current of the battery pack 10. After generating the three pulse signals _{p 2,} the battery-side microcomputer 16 is, during the period from the time _{t 8} to _{t 9,} generates a pulse _{p 1} of the fourth number. When 1 pulse signal p ₁ indicates 0.5 A of the end current, the end current of the battery pack 10 is determined as (0.5 A) × (number of pulse signals p ₁ ) depending on the number of continuous pulses p _1. The side microcomputer 140 can be notified.

As described above, the apparatus-side microcomputer 140 from the battery side microcomputer 16 through the terminal T4, after notifying the charge capacity, charge voltage, allowable current, and the end current depends from the time t ₁₀ to the charging apparatus 100 Charging of the battery pack 10 is started. Further, even after the charging of the battery pack 10 is started, the battery pack 10 outputs information such as temperature information, a voltage gradient, and a temperature gradient as necessary, and performs charge control as needed based on the information.

  The charging of the battery pack 10 is constant current control, constant voltage control, or the like, and the detailed charging conditions are the charging conditions notified from the battery side microcomputer 16 to the device side microcomputer 140 via the terminal T4. Based on.

  In the above embodiment, the charging capacity, charging voltage, allowable current, and termination current of the battery pack 10 are transferred from the battery pack 10 to the charging device 100 using the battery type determination circuit 120 that reads the battery type determination element 15. To be notified. When charging the attached battery pack 10, the charging apparatus 100 can charge the battery pack 10 by providing charging information of the battery pack from the battery pack 10. Therefore, the charging device 100 can perform charging control according to the battery pack 10.

  In addition, when the charging condition is notified to the charging device, a connection line (T4 terminal line) that is connected to the battery type discriminating / identifying element 14 existing in the battery pack and the battery type discriminating circuit 120 on the charging device 100 side is used. In addition, since a dedicated line for notifying the charging condition is not necessary for the battery pack or the charging device, the configuration of the battery pack or the charging device can be prevented from becoming complicated.

  Moreover, since the battery pack 10 also provides the charging device 100 with optimal charging conditions for charging, the battery pack 10 can be charged using an appropriate charging device.

  In the above embodiment, the connection line including the battery type determination element 15 is used as the communication line for sending the pulse signal corresponding to the charging information. However, the present invention is not limited to this, and other existing connection lines such as temperature A connection line including the detection element 14 or a connection line for notifying overcharge can also be used.

  In addition to the above charging capacity, charging voltage, allowable current, and termination current, the charging information notified from the battery pack 10 to the charging device 100 includes the battery cell unique identification information and the charging / discharging of the battery pack 10. The history information, the charging time for precharging the battery pack 10, the threshold voltage and current value, temperature information, and the like can be notified.

Furthermore, the number of continuous generations of the pulse p ₁ and the number of continuous generations of the pulse p ₂ are not limited to the above embodiment, and the physical quantity per pulse can be changed as appropriate.

DESCRIPTION OF SYMBOLS 10 Battery pack 11 Secondary battery 16 Control means 15 Battery kind discrimination | determination element T4 Signal output means 100 Charging apparatus

Claims (9)

A battery pack detachably connected to the power tool;
A charging device for charging the battery pack;
A charging system comprising:
The battery pack is
A secondary battery charged by the charging device;
Battery pack control means for controlling charging of the secondary battery;
Signal output means for outputting a signal representing information of the secondary battery;
Have
The battery pack control means generates a pulse signal representing a charging condition of the secondary battery and outputs it from the signal output means,
The charging device is:
Signal input means connected to the signal output means;
Charging device control means for controlling charging of the battery pack;
Have
The charging device control unit sets the charging condition based on the pulse signal input to the signal input unit and charges the secondary battery. The signal representing the information of the secondary battery represents the type, number, and connection form of the battery cells constituting the secondary battery,
The charging condition of the secondary battery is at least one of a charging method, charging voltage, charging current, charging time, termination current, charging capacity, charging / discharging history information, and precharging conditions of the secondary battery. The charging system according to claim 1.   The signal output means and the signal input means handle a signal via a terminal connected to at least one element of a battery type identification element, a temperature detection element, or an overcharge detection element of the battery pack. The charging system according to claim 1 or 2, characterized in that A battery pack that is detachably connected to the power tool,
A secondary battery that can be charged by a charging device;
Control means for controlling charging of the secondary battery;
A signal output means for outputting a signal representing information on the secondary battery to the charging device;
Have
The battery pack is characterized in that the control means outputs a pulse signal representing a charging condition of the secondary battery to the charging device via the signal output means. The signal representing the information of the secondary battery represents the type, number, and connection form of the battery cells constituting the secondary battery,
The charging condition of the secondary battery is at least one of a charging method, charging voltage, charging current, charging time, termination current, charging capacity, charging / discharging history information, and precharging conditions of the secondary battery. The battery pack according to claim 4.   The signal output means transmits a signal via a terminal connected to at least one element of a battery type identification element, a temperature detection element, or an overcharge detection element provided in the battery pack. The battery pack according to claim 4 or 5. A control means for enabling charging of a battery pack having a secondary battery and a terminal connected to the electric tool;
A signal input means for inputting a signal representing information of the secondary battery;
Have
The signal input means is input with a pulse signal generated by the battery pack and indicating a charging condition of the battery pack,
The control device charges the secondary battery based on the input charging condition. The signal representing the information of the secondary battery represents the type, number, and connection form of the battery cells constituting the secondary battery,
The control means, based on the type, number and connection form of the battery cells, the charging method, charging voltage, charging current, charging time, termination current, charging capacity, charging / discharging history information of the secondary battery, and The charging device according to claim 7, wherein the secondary battery is charged by setting at least one of precharge conditions as the charge condition.   The signal input means receives a signal through a terminal connected to at least one element of a battery type identification element, a temperature detection element, or an overcharge detection element provided in the battery pack. Item 9. The charging device according to Item 7 or 8.

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