JP4562214B2 - Detachable battery pack charge control device - Google Patents

Detachable battery pack charge control device Download PDF

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Publication number
JP4562214B2
JP4562214B2 JP12149598A JP12149598A JP4562214B2 JP 4562214 B2 JP4562214 B2 JP 4562214B2 JP 12149598 A JP12149598 A JP 12149598A JP 12149598 A JP12149598 A JP 12149598A JP 4562214 B2 JP4562214 B2 JP 4562214B2
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JP
Japan
Prior art keywords
charger
battery pack
battery
charging
control unit
Prior art date
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Expired - Lifetime
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JP12149598A
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Japanese (ja)
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JPH11317245A (en
Inventor
潤史 寺田
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ヤマハ発動機株式会社
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a charging control device for controlling charging of a detachable battery pack.
[0002]
[Prior art]
Removable battery packs are used for electric vehicles such as electric bicycles and electric wheelchairs, but a charger control function is added to the charger for charging such removable battery packs. When connected to the charger, battery information such as battery temperature and battery voltage is directly taken into the charger, and a method in which the charger controls the entire charging based on such information has been generally adopted.
[0003]
However, when the charger is provided with the charge control function as described above, conventionally, since only the charge control function for one type of battery pack is provided, various battery packs having different capacities and types of batteries are provided. It is difficult to charge with the same charger.
[0004]
Therefore, the following three methods are considered.
[0005]
(1) A method of setting a charge control method unique to the battery pack in the battery side control unit built in the battery pack, and controlling the charger by communication of signals from the battery pack
(2) The battery-side control unit built in the battery pack has an identification ID unique to the battery pack, while the charger-side control unit is set with a plurality of types of charge control methods corresponding to a plurality of types of identification IDs. A method of controlling the charger by selecting the charger control method by transmitting the identification ID to the charger by a signal
(3) The battery control unit built in the battery pack has a charge control parameter specific to the battery pack, while the charger control unit has a charge control function that can set a charge control method according to the parameter. A method of controlling the charger by setting a charge control method by transmitting a charge control parameter to the charger by a signal
[Problems to be solved by the invention]
However, in the methods (1) to (2), since the battery pack itself supplies power to the battery side control unit built in the battery pack, for example, the battery pack is deeply discharged by being left for a long time. In some cases, the battery-side control unit cannot be started up, the control signal cannot be transmitted to the charger, the charger cannot be controlled, and as a result, the battery pack cannot be charged. There was a problem that there was.
[0007]
The present invention has been made in view of the above problems, and the intended process is to activate the battery-side control unit built in the battery pack even when the battery pack is deeply discharged. An object of the present invention is to provide a charge control device for a detachable battery pack that can charge the battery pack by appropriately controlling the charger.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a charge control device in which the battery pack itself supplies power to the battery-side control unit incorporated in the battery pack, and the battery-side control incorporated in the battery pack. In a charging control device for a detachable battery pack that controls the charger by transmitting a signal from the unit to the charger, the battery-side control unit is connected to the charger even though the battery pack is connected to the charger. When the communication to the battery pack is not possible, a weak current is supplied from the charger to the battery pack to charge the battery pack, and the communication function between the battery-side control unit and the charger is restored. .
[0012]
According to a second aspect of the invention, in the invention according to the first aspect, wherein said launch simultaneously timer when outputting a weak current from the charger to the battery pack, the communication function in Jo Tokoro time is restored weak The supply of current is stopped.
[0013]
According to a third aspect of the present invention, in the first aspect of the present invention, if there is a signal transmitted from the battery side control unit during the output of the weak current from the charger to the battery pack, the charger is connected according to the signal. It is characterized by controlling.
[0014]
Therefore, according to the present invention, since a weak current is output from the charger to the battery pack under a predetermined condition, even if the battery pack is deeply discharged, The battery pack can be charged by activating the battery side control unit provided in the battery and properly controlling the charger.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0016]
<Embodiment 1>
FIG. 1 is a block diagram showing a configuration of a charge control device according to Embodiment 1 of the present invention, and FIG. 2 is a block diagram showing details of a configuration of a detachable battery pack.
[0017]
In FIG. 1, 1 is a detachable battery pack, 2 is a charger, and the detachable battery pack 1 includes a plurality of secondary batteries 3 connected in series, a battery side control unit 4, a display device 5 and the like in a case. It is built in and configured.
[0018]
Thus, the detachable battery pack 1 is connected via the positive and negative terminals 6 and 7 to the charger 2 during charging and to the motor drive circuit 9 for driving the electric motor 8 on the electric vehicle side during discharging. Is done. A display device 10 (see FIG. 2) connected to the motor drive circuit 9 is for displaying the remaining capacity of the secondary battery 3 while the vehicle is running.
[0019]
Further, in the case, a thermistor 11 for detecting the temperature of the secondary battery 3, a current detection unit 12 for detecting a current flowing through the secondary battery 3 during charging, and a voltage across the terminals of the secondary battery 3 And a display device 5 for displaying the remaining capacity of the secondary battery 3 are incorporated.
[0020]
By the way, as shown in FIG. 2, the battery-side control unit 4 is connected to the charger 2 or the motor drive circuit 9 via the communication interface 15 and the communication terminals 16 and 17. A remaining capacity calculating unit 18 for calculating the remaining capacity of the secondary battery 3, a temperature measuring unit 19 for measuring the temperature of the secondary battery 3, and a charging control unit for setting the output of the charger 2 20, a charge end determination unit 21 for determining whether or not to end the charge, a discharge control unit 22 for performing refresh of the secondary battery 3, and the like. The battery-side control unit 4 is connected to the secondary battery 3 via the power supply circuit 23 and receives power from the secondary battery 3 to operate.
[0021]
The remaining capacity calculation unit 18 obtains the remaining capacity of the secondary battery 3 based on the integrated value of the current detected by the current detection unit 12 (addition / subtraction value of the current that flows during charging or discharging). The obtained remaining capacity is stored in a memory (not shown).
[0022]
The temperature measuring unit 19 measures the temperature of the secondary battery 3 based on the output of the thermistor 11.
[0023]
The charging control unit 20 sets a charging current based on the remaining capacity of the secondary battery 3 obtained by the remaining capacity calculating unit 18 and the temperature of the secondary battery 3 measured by the temperature measuring unit 19, This charging current is transmitted as a charging instruction signal to the charger 2 via the communication interface 15, and the charging current is set by a map created in advance. Further, the charging control unit 20 determines whether or not the three temperatures measured by the temperature measuring unit 19 are within a preset charging start temperature range, and transmits an output command to the charger 2.
[0024]
The charge end determination unit 21 is in the end of charge when the temperature of the secondary battery 3 reaches a preset charge stop temperature, when the battery voltage reaches a preset charge stop voltage, or during constant current charging. When a peculiar phenomenon that occurs is detected, a charge stop signal is transmitted to the charger 2 via the communication interface 15.
[0025]
Here, the specific phenomenon that occurs at the end of charging is, for example, a phenomenon in which the battery voltage decreases at the end of charging and a rate at which the battery temperature increases (dT / dt: T is temperature and t is time). The battery voltage drop is obtained by a voltage drop computing unit (−Δ computing unit) 24 connected to the voltage detecting unit 13, and the battery temperature increase rate dT / dt is obtained by a dT / dt computing unit 25.
[0026]
The discharge control unit 22 controls the maximum discharge current that can be taken out when the battery 1 is mounted on an electric vehicle and travels, and the battery pack 1 is mounted on the charger 2 while the battery pack 1 is mounted on the display device 5. A refresh start signal is transmitted to the charger 2 by turning on the switch. The refresh is performed by discharging the secondary battery 3 with the charger 2, and the discharge control unit 22 stops the refresh when the voltage between the terminals of the secondary battery 3 reaches a preset refresh end value during the refresh. A signal is transmitted to the charger 2 via the communication interface 15.
[0027]
On the other hand, as shown in FIG. 1, the charger 2 converts the AC power supplied from the outlet plug 26 into a direct current by the AC / DC converter 27 and supplies this direct current to the charging terminal 6 as a charging current.
[0028]
Thus, the charger 2 has a charger-side control unit 28, a comparison / calculation unit 29, an output control unit 30 and the like in order to flow a charging current having a value set by the battery-side control unit 4. Further, a discharger 31 for refreshing the secondary battery 3 and a refresh discharge controller 32 for controlling the discharger 31 are provided.
[0029]
The charger side control unit 28 is for receiving a signal from the battery side control unit 4 via the signal terminal 16 and for transmitting a signal to the battery side control unit 4 via the transmission terminal 17. The charging instruction signal and the charging stop signal are received and transmitted to the comparison / calculation unit 29, and the elapsed time (charging time) after the start of charging is counted by a timer (not shown). It fulfills the function of transmitting a charge stop signal to the comparison / calculation unit 29 when the total timer value sent from the control unit 4 is exceeded. A battery connection detection unit 33 that detects the connection of the battery pack 1 to the charger 2 is connected to the charger side control unit 28.
[0030]
The charger-side control unit 28 also functions to transmit a refresh start signal and a refresh stop signal sent from the battery-side control unit 4 to the refresh discharge control unit 32. The refresh of the secondary battery 3 is started when the refresh discharge control unit 32 sends a discharge start signal to the refresh discharger 31 and is finished when the refresh discharge control unit 32 sends a discharge stop signal to the refresh discharger 31. . During charging and refreshing, the LED 35 is turned on by the LED driver 34 connected to the charger-side control unit 28.
[0031]
By the way, the comparison / calculation unit 29 obtains a target charging current from the charging instruction signal received from the charger-side control unit 28, and a voltage detection with the current detection unit 36 connected to the downstream side of the AC / DC converter 27. The output control unit 30 is feedback-controlled so that the charging current matches the target charging current based on the output of the unit 37, and the output control unit 30 controls the AC / DC converter 27 based on the control signal from the comparison / calculation unit 29. Control the output.
[0032]
Next, charging control procedures in the charger 2 and the battery pack 1 will be described based on the flowcharts shown in FIGS.
[0033]
First, the charging control procedure in the charger 2 will be described with reference to FIG. 3. The charger-side control unit 28 of the charger 2 is connected to the charger by a signal transmitted from a battery connection detection unit 33 including, for example, a mechanical contact. 2 determines whether or not the battery pack 1 is mechanically connected (step S1). If the battery pack 1 is connected, the charger 2 shifts to the charging mode. Next, the communication function is confirmed (step S2).
[0034]
Thus, for example, when the secondary battery 3 of the battery pack 1 is deeply discharged and the battery voltage is low and communication from the battery side controller 4 to the charger 2 is not possible, the charger side controller of the charger 2 28 controls the output control unit 30 to flow a weak current of about 0.05 to 0.1 C from the AC / DC converter 27 to the secondary battery 3 of the battery pack 1 to charge the secondary battery 3 (step S3). ) Simultaneously with a timer (step S4), and it is confirmed whether or not the communication function between the battery pack 1 and the charger 2 has been restored within a predetermined time (steps S5 and S6). If the communication function between the battery pack 1 and the charger 2 does not recover within a predetermined time, an abnormality display is output (step S15), and the operation is terminated as charging is impossible (step S14).
[0035]
On the other hand, when the communication function between the battery pack 1 and the charger 2 is restored within a predetermined time due to the charging of the secondary battery 3 by the weak current, the supply of the weak current to the secondary battery 3 is stopped (step S7). ), Waiting to receive a signal from the battery side control unit 4, and if a signal is received, the charging current value is set according to the instruction signal (arrow a) (step S8) and charging of the battery pack 1 is started (step S9). ).
[0036]
By the way, as a result of the determination in step S2, if the communication function is confirmed to be normal, the signal from the battery side control unit 4 is waited. If the signal is received, the charging current value is set (step S8). Charging control is started (step S9).
[0037]
Thus, when charging of the battery pack 1 is started, it is determined whether or not a signal for changing the charging current value is received (arrow b) (step S10). If the signal is received, the charging current value is determined. Is changed (step S11), and charging of the battery pack 1 is continued until a charge stop signal (arrow c) is received (step S12). When the charge stop signal is received, charging is stopped (step S13) End (step S14) .
[0038]
Next, the charge control procedure in the battery pack 1 will be described with reference to FIG.
[0039]
First, as shown in FIG. 3, it is determined whether or not the charger 2 is connected to the battery pack 1 (step S21), and the communication function with the charger 2 is confirmed (step S22). The charging current value is determined from the voltage 3 (step S23), and the timer value is determined from the capacity data / charging current value (step S24). Thereafter, it is determined whether or not the temperature of the secondary battery 3 is within a predetermined charging start temperature range (step S25). If the temperature is out of the range, the process waits until the temperature falls within the range (step S26). If it is within the range, the charging current value is transmitted to the charger 2 (step S27: arrow a).
[0040]
Then, the charging of the battery pack 1 is started and the time measurement by the timer is started (step S28), it is determined whether or not to change the charging current value (step S29), and the charging current value should be changed. Transmits a charging current change signal (arrow b: step S30), re-determines the timer value from the charging current value and capacity data, continues charging, and exceeds the determined timer value (charging time) It is determined whether or not (step S31). If the timer value (charging time) exceeds the set value (that is, the timer is over), a charging stop signal is transmitted to the charger 2 (step S33: arrow c), and the charging operation is terminated (step S33). S34) If the timer value (charging time) does not exceed the set value, the end of charging is determined (step S32). If the charging should not be terminated, the charging should be continued and the charging should be terminated. If there is, a charging stop signal is transmitted to the charger 2 (step S33), and the charging operation is terminated (step S34).
[0041]
As described above, in the present embodiment, a weak current is output from the charger 2 to the battery pack 1 under a predetermined condition so that the battery-side control unit 4 built in the battery pack 1 is activated. Therefore, even if the battery pack 1 has been deeply discharged, the battery pack 1 can be appropriately controlled by activating the battery side control unit 4 provided on the battery pack 1 side and controlling the charger 2 appropriately. Can be charged.
[0042]
<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.
[0043]
FIG. 5 is a block diagram showing the configuration of the charging control apparatus according to the present embodiment. In this figure, the same elements as those shown in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted below. To do.
[0044]
In the present embodiment, a battery identification ID unit 38 for transmitting a unique battery identification ID is incorporated in the battery side control unit 4 built in the detachable battery pack 1, and the battery identification ID is a communication interface. 15 is transmitted to the charger 2 via 15.
[0045]
Next, charging control procedures in the charger 2 and the battery pack 1 will be described based on the flowcharts shown in FIGS.
[0046]
First, the charge control procedure in the charger 2 will be described with reference to FIG. 6. Steps S1 to S15 are the same as the processes in the first embodiment (the processes in steps S1 to S15 shown in FIG. 3). When the communication between the battery pack 1 and the charger 2 is confirmed, the charger 2 receives the battery identification ID from the battery pack 1 and selects the charging control method corresponding to the ID (arrow a) (step S41). ). Thereafter, it is determined whether or not the temperature of the secondary battery 3 is within a predetermined charging start temperature range (step S42). If the temperature is out of the range, the process waits until the temperature is within the range (step S43). In the case of the above, charging of the battery pack 1 is started (step S44).
[0047]
Then, the end of charging is determined (step S45). If the charging should not be terminated, the charging is continued as it is. If the charging should be terminated, a charging stop signal is transmitted to the charger 2 ( Step S46) The charging operation is terminated (Step S47).
[0048]
Next, the charge control procedure in the battery pack 1 will be described with reference to FIG.
[0049]
First, it is determined whether or not the charger 2 is connected to the battery pack 1 (step S51), and after confirming the communication function (step S52), a battery identification ID signal is transmitted to the charger 2 (arrow a: In step S53, the transmission is terminated (step S54).
[0050]
Thus, also in the present embodiment, the same effect as in the first embodiment can be obtained.
[0051]
<Embodiment 3>
Next, a third embodiment of the present invention will be described with reference to FIGS.
[0052]
FIG. 8 is a block diagram showing the configuration of the charging control apparatus according to the present embodiment. In FIG. 8, the same elements as those shown in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted below. To do.
[0053]
In the present embodiment, the battery-side control unit 4 of the detachable battery pack 1 is provided with a specific charge control parameter, and the charge control parameter is transmitted to the charger 2 via the communication interface 15. . The charge control parameters include, for example, the following.
[0054]
-Charging method-Total timer value-Charging start conditions
(1) Charging start temperature range
(2) Low-voltage battery judgment condition, charging current value, charging stop condition
(1) Voltage drop value (-Δ value)
(2) Stop voltage
(3) Stop temperature
(4) Battery temperature increase rate (dT / dt)
・ Auxiliary charging
(1) Auxiliary charging current value
(2) Auxiliary Charging Timer Value / Refresh Discharge End Voltage Next, charging control procedures in the charger 2 and the battery pack 1 will be described based on the flowcharts shown in FIGS.
[0055]
First, the charging control procedure in the charger 2 will be described with reference to FIG. 9. Steps S1 to S15 are the same as the processing in the first embodiment (steps S1 to S15 shown in FIG. 3), and the battery pack. When the communication between 1 and the charger 2 is confirmed, the charger 2 receives the charging control parameter from the battery pack 1 (arrow a), sets the charging control method (step S61), and sends a parameter reception completion signal. Transmission to the battery pack 1 (arrow b: step S62) starts charging control of the battery pack 1 (step S63). After the start of charge control, battery data (for example, battery temperature, battery voltage, battery capacity, etc.) necessary for charge control is always received from the battery pack 1 (arrow c).
[0056]
Then, the end of charging is determined based on the received battery data (step S64). If the charging should not be terminated, the charging is continued as it is. If the charging should be terminated, the battery pack 1 is charged. A completion signal is transmitted (arrow d), and the charging operation is terminated (step S66).
[0057]
Next, the charge control procedure in the battery pack 1 will be described with reference to FIG.
[0058]
First, it is determined whether or not the battery pack 1 is connected to the charger 2 (step S71), and after confirming the communication function (step S72), the charging control parameter is transmitted to the charger 2 (arrow a: step). S73) After confirming that the charger 2 has received the charge control parameter (arrow b: step S74), the transmission of the parameter data is stopped. In addition, after confirming the completion of reception from the charger 2, the battery data necessary for the charger 2 to perform charging control is continuously transmitted until the charging is completed (arrow c). Then, at the point of time when the charging completion signal is received from the charger 2, the data transmission is stopped and the process is terminated (step S75).
[0059]
Thus, also in the present embodiment, the same effect as in the first embodiment can be obtained.
[0060]
【The invention's effect】
As is apparent from the above description, according to the present invention, a weak current is output from the charger to the battery pack under a predetermined condition, so that the battery pack is deeply discharged. Even if it exists, the effect that the battery pack can be charged by starting the battery side control part provided in the battery pack side and controlling a charger appropriately is acquired.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a charging control apparatus according to Embodiment 1 of the present invention.
FIG. 2 is a block diagram showing details of the configuration of the removable battery pack according to Embodiment 1 of the present invention.
FIG. 3 is a flowchart showing a charging control procedure in the charger according to Embodiment 1 of the present invention.
FIG. 4 is a flowchart showing a charging control procedure in the removable battery pack according to Embodiment 1 of the present invention.
FIG. 5 is a block diagram showing a configuration of a charging control apparatus according to Embodiment 2 of the present invention.
FIG. 6 is a flowchart showing a charging control procedure in the charger according to the second embodiment of the present invention.
FIG. 7 is a flowchart showing a charging control procedure in the removable battery pack according to Embodiment 2 of the present invention.
FIG. 8 is a block diagram showing a configuration of a charging control apparatus according to Embodiment 3 of the present invention.
FIG. 9 is a flowchart showing a charging control procedure in the charger according to the third embodiment of the present invention.
FIG. 10 is a flowchart showing a charging control procedure in the removable battery pack according to Embodiment 3 of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Removable battery pack 2 Charger 3 Secondary battery 4 Battery side control part 15 Communication interface 18 Remaining capacity calculation part 20 Charge control part 21 End of charge determination part 22 Discharge control part 23 Power supply circuit 27 AC / DC converter 28 Charger side Control unit 29 Comparison / calculation unit 30 Output control unit 33 Battery connection detection unit 38 Battery identification ID unit

Claims (3)

  1. A charge control device in which a battery pack itself supplies power to a battery-side control unit built in the battery pack, and is a detachable battery pack that controls a charger by transmitting a signal from the battery-side control unit to the charger. In the charge control device,
    When communication from the battery-side control unit to the charger is not possible despite the battery pack being connected to the charger, a weak current is supplied from the charger to the battery pack. A charge control device for a detachable battery pack, wherein the pack is charged to restore a communication function between the battery side control unit and the charger.
  2. 2. The attachment / detachment according to claim 1, wherein a timer is started simultaneously with outputting a weak current from the charger to the battery pack, and the supply of the weak current is stopped when the communication function is restored within a predetermined time. Type battery pack charge control device.
  3. 2. The detachable battery pack according to claim 1, wherein if a signal is transmitted from the battery side control unit while a weak current is being output from the charger to the battery pack, the charger is controlled according to the signal. Charge control device.
JP12149598A 1998-04-30 1998-04-30 Detachable battery pack charge control device Expired - Lifetime JP4562214B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12149598A JP4562214B2 (en) 1998-04-30 1998-04-30 Detachable battery pack charge control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12149598A JP4562214B2 (en) 1998-04-30 1998-04-30 Detachable battery pack charge control device

Publications (2)

Publication Number Publication Date
JPH11317245A JPH11317245A (en) 1999-11-16
JP4562214B2 true JP4562214B2 (en) 2010-10-13

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4627588B2 (en) * 2000-10-20 2011-02-09 パナソニック株式会社 Battery pack and its inspection device
JP2009112111A (en) * 2007-10-30 2009-05-21 Toshiba Corp Battery pack, charger, and battery pack system
JP5658936B2 (en) * 2010-07-26 2015-01-28 株式会社東芝 Secondary battery pack, charger and vehicle
JP2013211947A (en) * 2012-03-30 2013-10-10 Sony Corp Power control device, power control method, electric vehicle, power storage device and power system
WO2014111999A1 (en) * 2013-01-17 2014-07-24 ソニー株式会社 Electrical storage apparatus and startup method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04244740A (en) * 1991-01-28 1992-09-01 Matsushita Electric Works Ltd Charger
JPH06153409A (en) * 1992-11-05 1994-05-31 Sony Corp Method of controlling protecting circuit of secondary battery
JPH08140281A (en) * 1994-11-09 1996-05-31 Mitsubishi Electric Corp Charger
JPH0984271A (en) * 1995-09-19 1997-03-28 Toshiba Corp Charger for radio communication device
JPH09285026A (en) * 1996-04-05 1997-10-31 Sony Corp Device and method for charging battery, and battery pack
JPH09322420A (en) * 1996-05-27 1997-12-12 Sony Corp Charge time operation method and battery pack

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04244740A (en) * 1991-01-28 1992-09-01 Matsushita Electric Works Ltd Charger
JPH06153409A (en) * 1992-11-05 1994-05-31 Sony Corp Method of controlling protecting circuit of secondary battery
JPH08140281A (en) * 1994-11-09 1996-05-31 Mitsubishi Electric Corp Charger
JPH0984271A (en) * 1995-09-19 1997-03-28 Toshiba Corp Charger for radio communication device
JPH09285026A (en) * 1996-04-05 1997-10-31 Sony Corp Device and method for charging battery, and battery pack
JPH09322420A (en) * 1996-05-27 1997-12-12 Sony Corp Charge time operation method and battery pack

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