JP2007166715A - Battery pack and charging method thereof - Google Patents

Battery pack and charging method thereof Download PDF

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Publication number
JP2007166715A
JP2007166715A JP2005356699A JP2005356699A JP2007166715A JP 2007166715 A JP2007166715 A JP 2007166715A JP 2005356699 A JP2005356699 A JP 2005356699A JP 2005356699 A JP2005356699 A JP 2005356699A JP 2007166715 A JP2007166715 A JP 2007166715A
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connected
series
terminal
field effect
charge
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JP2005356699A
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JP4812419B2 (en
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Tsukasa Takahashi
司 高橋
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Sony Corp
ソニー株式会社
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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

Abstract

<P>PROBLEM TO BE SOLVED: To improve power loss during charging, eliminate damage due to an inrush current by a potential difference between a plurality of serial-connection battery blocks, and to further extend discharging time. <P>SOLUTION: A positive terminal of a first battery block in which a plurality of secondary batteries are connected in series is connected to first and second field effect transistors in series. The second field effect transistor is connected to a charge/discharge positive terminal. A negative terminal of the first series-connected battery block is connected to a charge/discharge negative terminal. The positive terminal of the second battery block in which the plurality of secondary batteries are connected in series is connected to third and fourth field effect transistors in series. The fourth field effect transistor is connected to the charge/discharge positive terminal. The negative terminal of the second series-connected battery block is connected to the charge/discharge terminal. The voltage of the first and second series-connected battery blocks is read. A control microcomputer for controlling the first, second, third, and fourth field effect transistors is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a battery pack having a relatively large capacity and a method for charging the battery pack.

  Generally, in order to obtain a battery pack having a relatively large capacity, a configuration is adopted in which a plurality of series-connected battery blocks in which a plurality of secondary batteries are connected in series are connected in parallel. When a plurality of series-connected battery blocks in which a plurality of secondary batteries are connected in series are connected in parallel, and there is a potential difference between the plurality of series-connected battery blocks, the series connection battery block having a high potential is connected in series with a low potential. Inrush current flows into the connected battery block.

  When this inrush current flows, this current is limited only to the internal impedance of the series connection battery block, and the series connection battery block having a low potential is damaged by this inrush current.

  Therefore, the conventional battery pack has a configuration as shown in FIG. In FIG. 4, 1, 2, and 3 indicate a series connection battery block in which a plurality of, for example, 4 secondary batteries are connected in series, and the positive terminal of each of the series connection battery blocks 1, 2, and 3 is prevented from backflow. The diodes 4a, 5a and 6a are connected to the cathodes, and the anodes of the backflow preventing diodes 4a, 5a and 6a are connected to the charging positive terminal 7 to which a positive DC voltage is supplied during charging.

  Further, the positive terminals of the series-connected battery blocks 1, 2, and 3 are connected to the anodes of the backflow prevention diodes 4b, 5b, and 6b, respectively, and the backflow prevention diodes 4b, 5b, and 6b are respectively connected. The cathode is connected to a discharge positive terminal 8 that discharges a positive DC voltage when discharging.

  The negative terminal of each of the series-connected battery blocks 1, 2, and 3 is connected to a charge / discharge negative terminal 9 that becomes a negative terminal during charging and discharging, respectively.

  In the conventional example of FIG. 4, when connected, the series connection battery blocks 1, 2 and 3 are charged via the diodes 4a, 5a and 6a by the charging current from the charging positive terminal 7, and when discharging, the series connection battery blocks 1, 2 and 3 are connected in series. The respective discharge currents from the battery blocks 1, 2 and 3 are discharged to the load via the discharge positive terminal 8 via the diodes 4b, 5b and 6b.

  In the example of FIG. 4, even if there is a potential difference between the series-connected battery blocks 1, 2, and 3, there are diodes 4 a, 5 a, 6 a and 4 b, 5 b, 6 b for preventing backflow. And no current flows between 3 and 3, no inrush current flows, and no damage is caused to each of the series-connected battery blocks 1, 2, and 3.

  Further, Patent Document 1 discloses a charging current for each parallel circuit configured by means for individually detecting a battery voltage and a series circuit of secondary batteries for a plurality of secondary batteries connected in series and parallel. And a means for controlling the charging current for each battery and a means for controlling the charging output for each parallel circuit based on the detected battery voltage or charging voltage. When voltage charging is performed, changes in battery voltage for each secondary battery are detected, charging current for each secondary battery is controlled, changes in charging current for each parallel circuit are detected, and charging output for each parallel circuit is controlled What has been made to be disclosed is disclosed.

The one disclosed in Patent Document 1 is designed to prevent overcharge and overdischarge, and there is a potential difference between a plurality of series-connected battery blocks, and an inrush current to the series-connected battery block having a low potential. It is not intended to prevent.
JP-A-10-304586

  However, in the conventional example shown in FIG. 4, power loss occurs in the backflow prevention diodes 4b, 5b and 6b due to the discharge current during discharge. That is, assuming that the discharge current of the diodes 4b, 5b and 6b for backflow prevention is I and the threshold voltage of the diodes 4b, 5b and 6b is Vf, a power loss of I × Vf occurs.

  This power loss increases as the threshold voltage Vf of the diodes 4b, 5b, and 6b is relatively large, for example, 0.6V, and the discharge current I increases, and becomes so large that it cannot be ignored in a large-capacity battery pack. There was an inconvenience.

  Further, since the series connection battery blocks 1, 2 and 3 are separated by the diodes 4a, 5a, 6a and 4b, 5b, 6b, the variation in capacity balance at the time of connection is not improved. Charging / discharging in the state where the capacity balance of 1, 2 and 3 is lost means that when there is an overdischarge prevention circuit at the time of discharge, the discharge time depends on the low-capacity series-connected battery block. There were inconveniences such as shortening the time.

  In view of the above, the present invention improves power loss during discharging, prevents damage from inrush current due to a potential difference between a plurality of series-connected battery blocks, and further extends the discharge time. With the goal.

  The battery pack of the present invention connects the positive terminal of a first series-connected battery block in which a plurality of secondary batteries are connected in series to the drain terminal of the first field effect transistor, and the source terminal of the first field effect transistor Is connected to the source terminal of the second field effect transistor, the drain terminal of the second field effect transistor is connected to the charge / discharge positive terminal, and the negative terminal of the first series-connected battery block is connected to the charge / discharge negative terminal. The positive terminal of the second series-connected battery block in which a plurality of secondary batteries are connected in series is connected to the drain terminal of the third field effect transistor, and the source terminal of the third field effect transistor is connected to the fourth terminal. And the drain terminal of the fourth field effect transistor is connected to the charge / discharge positive terminal, and the second series connection is connected to the source terminal of the field effect transistor. The negative terminal of the battery block is connected to the charge / discharge negative terminal, the voltages of the first and second series-connected battery blocks are read, and the first, second, third and fourth field effect transistors are controlled. A control microcomputer is provided.

  In the battery pack charging method of the present invention, the positive terminal of the first series-connected battery block in which a plurality of secondary batteries are connected in series is connected to the drain terminal of the first field effect transistor, and the first electric field is supplied. The source terminal of the effect transistor is connected to the source terminal of the second field effect transistor, the drain terminal of the second field effect transistor is connected to the charge / discharge positive terminal, and the negative terminal of the first series-connected battery block is connected Connected to the charge / discharge negative electrode terminal, the positive terminal of the second series-connected battery block in which a plurality of secondary batteries are connected in series is connected to the drain terminal of the third field effect transistor. Connecting the source terminal to the source terminal of the fourth field effect transistor, connecting the drain terminal of the fourth field effect transistor to the charge / discharge positive electrode terminal; The negative terminal of the second series-connected battery block is connected to the charge / discharge negative terminal, the voltages of the first and second series-connected battery blocks are read, and the first, second, third and fourth A battery pack charging method provided with a control microcomputer for controlling a field effect transistor, comparing the voltages of the first and second series-connected battery blocks, charging the lower one first, When they are equal, they are charged at the same time.

  According to the present invention, when discharging, the first, second, third and fourth field effect transistors are turned on, so that the first, second, third and fourth field effect transistors are turned on. The voltage drop of the first, second, third, and fourth field effect transistors is extremely small, and the power loss due to the first, second, third, and fourth field effect transistors is extremely small. Since the one with the lower voltage is charged first and charged at the same time when the voltages become equal, when the first and second series-connected battery blocks are connected in parallel to each other, the first and second The potential difference between the two series-connected battery blocks is 0 V, and no current flows between the first and second series-connected battery blocks, and a high-safety large-capacity battery pack that is not damaged by the inrush current is obtained. be able to.

  In addition, according to the present invention, since the potential difference between the series-connected battery blocks can be eliminated during charging, the capacity balance between the series-connected battery blocks can be improved, and the discharge time can be extended.

  Hereinafter, an example of the best mode for carrying out the battery pack and the battery pack charging method of the present invention will be described with reference to FIGS. 1, 2, and 3. 1, 2, and 3, portions corresponding to those in FIG. 4 are denoted by the same reference numerals in FIG. 1.

  In the example of FIG. 1, 1, 2, and 3 indicate a series connection battery block in which a plurality of, for example, four secondary batteries are connected in series, and the positive terminal of each of the series connection battery blocks 1, 2, and 3 is discharged. The p-channel field effect transistors 10a, 11a and 12a for control are connected to the respective drain terminals.

  The source terminals of the field effect transistors 10a, 11a and 12a are connected to the source terminals of the p-channel field effect transistors 10b, 11b and 12b for charge control, respectively, and the field effect transistors 10b, 11b and 12b are connected. Each drain terminal is connected to a charge / discharge positive electrode terminal 13 which becomes a positive electrode terminal during charging and discharging.

  Further, the gate terminals of the field effect transistors 10a, 10b, 11a, 11b, 12a and 12b are connected to the respective control terminals of the control microcomputer 14 which is controlled as described later.

  The negative terminal of each of the series-connected battery blocks 1, 2, and 3 is connected to a charge / discharge negative terminal 9 that becomes a negative terminal during charging and discharging, respectively. Further, the positive terminal and the negative terminal of each of the series-connected battery blocks 1, 2, and 3 are connected to reading terminals for reading the respective voltages of the control microcomputer 14, and the control microcomputer 14 uses the respective series-connected batteries. Read the voltages of blocks 1, 2 and 3.

  In this example, as shown in FIG. 1, the control microcomputer 14 turns off all the field effect transistors 10a, 10b, 11a, 11b, 12a and 12b when the series-connected battery blocks 1, 2 and 3 are connected. And charging and discharging are impossible.

  At the time of charging, a charging voltage is supplied between the charging / discharging positive electrode terminal 13 and the charging / discharging negative electrode terminal 9, and at this time, the control microcomputer 14 reads the respective voltages of the respective series-connected battery blocks 1, 2, and 3. In this case, assuming that the voltages of the series-connected battery blocks 1, 2, and 3 are V1, V2, and V3, at the start of charging, this voltage is, for example, V1 <V2 <V3 as shown in FIG.

  At this time, as shown in FIGS. 2A and 2B, the control microcomputer 14 periodically turns on and off the field effect transistors 10a and 10b, and charges the series-connected battery block 1 at the time of the periodic on. At this periodic OFF, the open circuit voltage V1 of the series connection battery block 1 is read, and the open circuit voltage V1 and the voltage V2 of the series connection battery block 2 are compared.

  When the open circuit voltage V1 and the voltage V2 of the series connection battery block 2 are V1 <V2, the above is repeated. When the open circuit voltage V1 and the voltage V2 of the series connection battery block 2 are equal, and V1 = V2 As shown in FIGS. 2C and 2D, the field effect transistors 11a and 11b are periodically turned on and off in the same manner as the field effect transistors 10a and 10b. As shown in the charging curve of FIG. 3, when the battery is simultaneously turned off, the open-circuit voltage V1 = V2 of the series-connected battery blocks 1 and 2 is read, and the open-circuit voltage V1 = V2 and the voltage of the series-connected battery block 3 are read. Compare with V3.

  When the open voltage V1 = V2 and the voltage V3 of the series-connected battery block 3 are V1 = V2 <V3, the above is repeated, and the open voltage V1 = V2 is equal to the voltage V3 of the series-connected battery block 3, and V1 = When V2 = V3, as shown in FIGS. 2A, B, C, D, E and F, the field effect transistors 10a, 10b, 11a, 11b, 12a and 12b are all turned on, and the series-connected battery block 1, 2 and 3 are charged simultaneously until the end of charging as shown in the charging curve of FIG. 2E and F show the field effect transistors 12a and 12b on and off.

  At the time of discharging, the control microcomputer 14 turns on all the field effect transistors 10a, 10b, 11a, 11b, 12a and 12b, and supplies the DC voltage from the series-connected battery blocks 1, 2, and 3 to the charge / discharge positive terminal. 13 and the charge / discharge negative terminal 9 are supplied to the load. In this case, since the voltages of the series-connected battery blocks 1, 2, and 3 are equal, no inrush current flows between the series-connected battery blocks 1, 2, and 3.

  According to this example, since the field effect transistors 10a, 10b, 11a, 11b, 12a and 12b are all turned on during discharging, the field effect transistors 10a, 10b, 11a, 11b, 12a and 12b are turned on. The voltage drop of the field effect transistors 10a, 10b, 11a, 11b, 12a and 12b is extremely small, and at the time of charging, the voltages of the series-connected battery blocks 1, 2 and 3 are compared, The battery is charged in order from the lower series-connected battery block, and when the voltages of the series-connected battery blocks 1, 2 and 3 are equal to V1 = V2 and V1 = V2 = V3, they are charged simultaneously. When battery blocks 1, 2 and 3 are connected in parallel to each other, the power supply between the series connected battery blocks The difference is 0V, this is between the series connected battery blocks 1, 2 and 3 can be obtained a battery pack of high mass safety not damaged by inrush current does not flow current.

  In addition, according to this example, since the potential difference between the series-connected battery blocks 1, 2, and 3 can be eliminated during charging, the capacity balance between the series-connected battery blocks 1, 2, and 3 can be improved, and the discharge time can be reduced. Can be extended.

  In the above example, an example in which three series-connected battery blocks are connected in parallel has been described. However, the number of series-connected battery blocks to be connected in parallel may be two or four or more as needed. is there. At this time, it can be easily understood that it can be configured in the same manner as described above.

  Further, the present invention is not limited to the above-described example, and various other configurations can be adopted without departing from the gist of the present invention.

It is a block diagram which shows the example of the best form for implementing this invention battery pack. It is a diagram with which it uses for description of this invention. It is a diagram with which it uses for description of this invention. It is a block diagram which shows the example of the conventional battery pack.

Explanation of symbols

  1, 2, 3... Series connection battery block, 9... Charge / discharge negative electrode terminal, 10 a, 10 b, 11 a, 11 b, 12 a, 12 b ... field effect transistor, 13 ... charge / discharge positive electrode terminal, 14.

Claims (3)

  1.   A positive terminal of a first series-connected battery block in which a plurality of secondary batteries are connected in series is connected to a charge / discharge positive terminal via a first charge / discharge control switching element, and a negative electrode of the first series-connected battery block. A terminal is connected to the charge / discharge negative electrode terminal, and a positive electrode terminal of a second series-connected battery block in which a plurality of secondary batteries are connected in series is connected to the charge / discharge positive electrode terminal via a second charge / discharge control switching element. The negative terminal of the second series-connected battery block is connected to the charge / discharge negative terminal, the voltage of the first and second series-connected battery blocks is read, and the first and second series-connected battery blocks A control microcomputer is provided for comparing the voltages, charging the lower one first, and controlling the first and second charge / discharge control switching elements so as to charge simultaneously when the voltages become equal. Battery pack, characterized in that.
  2.   A positive terminal of a first series-connected battery block in which a plurality of secondary batteries are connected in series is connected to a drain terminal of the first field effect transistor, and a source terminal of the first field effect transistor is connected to a second field effect. Connecting to the source terminal of the transistor, connecting the drain terminal of the second field effect transistor to the charge / discharge positive terminal, connecting the negative terminal of the first series-connected battery block to the charge / discharge negative terminal; The positive terminal of the second series-connected battery block in which the secondary batteries are connected in series is connected to the drain terminal of the third field effect transistor, and the source terminal of the third field effect transistor is the source of the fourth field effect transistor. A drain terminal of the fourth field-effect transistor is connected to the charge / discharge positive terminal, and a negative terminal of the second series-connected battery block is connected to the front terminal. Provided with a control microcomputer connected to the charge / discharge negative electrode terminal for reading the voltage of the first and second series-connected battery blocks and controlling the first, second, third and fourth field effect transistors A battery pack characterized by
  3. A positive terminal of a first series-connected battery block in which a plurality of secondary batteries are connected in series is connected to a drain terminal of the first field effect transistor, and a source terminal of the first field effect transistor is connected to a second field effect. Connecting to the source terminal of the transistor, connecting the drain terminal of the second field effect transistor to the charge / discharge positive electrode terminal, connecting the negative electrode terminal of the first series-connected battery block to the charge / discharge negative electrode terminal; The positive terminal of the second series-connected battery block in which the secondary batteries are connected in series is connected to the drain terminal of the third field effect transistor, and the source terminal of the third field effect transistor is the source of the fourth field effect transistor. A drain terminal of the fourth field-effect transistor is connected to the charge / discharge positive terminal, and a negative terminal of the second series-connected battery block is connected to the front terminal. A battery provided with a control microcomputer that is connected to a charge / discharge negative electrode terminal, reads the voltages of the first and second series-connected battery blocks, and controls the first, second, third, and fourth field effect transistors A charging method for the pack,
    The battery pack charging method, wherein the voltages of the first and second series-connected battery blocks are compared, the one with the lower voltage is charged first, and charged simultaneously when the voltages are equal. .
JP2005356699A 2005-12-09 2005-12-09 Battery pack and battery pack charging / discharging method Expired - Fee Related JP4812419B2 (en)

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Cited By (10)

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JP2009207253A (en) * 2008-02-27 2009-09-10 Autech Japan Inc Battery-charging system and battery-charging method
JP2010029015A (en) * 2008-07-23 2010-02-04 Kyushu Electric Power Co Inc Battery pack system
WO2013042165A1 (en) * 2011-09-21 2013-03-28 トヨタ自動車株式会社 Vehicle battery control device and vehicle battery control method
WO2013076877A1 (en) * 2011-11-25 2013-05-30 株式会社日立製作所 Storage battery system
WO2013121849A1 (en) * 2012-02-16 2013-08-22 日本電気株式会社 Adjusting device, battery assembly, and adjusting method
WO2013179454A1 (en) * 2012-05-31 2013-12-05 パイオニア株式会社 Charging/discharging control device
WO2014132321A1 (en) 2013-02-26 2014-09-04 株式会社 日立製作所 Power source device
CN104106175A (en) * 2012-02-28 2014-10-15 智晖有限公司 Method for charge balancing and load control in parallel battery packs
CN106716771A (en) * 2016-09-22 2017-05-24 深圳市大疆创新科技有限公司 Control method, control system, and storage medium of battery pack, and unmanned aerial vehicle
JP2017152388A (en) * 2009-04-16 2017-08-31 ヴァレンス テクノロジー インコーポレーテッドValence Technology,Inc. Battery system

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Cited By (19)

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Publication number Priority date Publication date Assignee Title
JP2009207253A (en) * 2008-02-27 2009-09-10 Autech Japan Inc Battery-charging system and battery-charging method
JP2010029015A (en) * 2008-07-23 2010-02-04 Kyushu Electric Power Co Inc Battery pack system
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WO2013042165A1 (en) * 2011-09-21 2013-03-28 トヨタ自動車株式会社 Vehicle battery control device and vehicle battery control method
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WO2013121849A1 (en) * 2012-02-16 2013-08-22 日本電気株式会社 Adjusting device, battery assembly, and adjusting method
CN104106175A (en) * 2012-02-28 2014-10-15 智晖有限公司 Method for charge balancing and load control in parallel battery packs
JPWO2013179454A1 (en) * 2012-05-31 2016-01-14 パイオニア株式会社 Charge / discharge control device
WO2013179454A1 (en) * 2012-05-31 2013-12-05 パイオニア株式会社 Charging/discharging control device
WO2014132321A1 (en) 2013-02-26 2014-09-04 株式会社 日立製作所 Power source device
CN106716771A (en) * 2016-09-22 2017-05-24 深圳市大疆创新科技有限公司 Control method, control system, and storage medium of battery pack, and unmanned aerial vehicle
WO2018053741A1 (en) * 2016-09-22 2018-03-29 深圳市大疆创新科技有限公司 Control method of battery pack, control system, storage medium, and unmanned aerial vehicle
CN106716771B (en) * 2016-09-22 2018-11-13 深圳市大疆创新科技有限公司 Control method, control system, storage medium and the unmanned vehicle of battery pack
CN109103960A (en) * 2016-09-22 2018-12-28 深圳市大疆创新科技有限公司 Control method, control system, storage medium and the unmanned vehicle of battery pack

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