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WO2009041180A1 - Dispositif de protection pour batterie assemblée et système de batterie assemblée le contenant - Google Patents

Dispositif de protection pour batterie assemblée et système de batterie assemblée le contenant Download PDF

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Publication number
WO2009041180A1
WO2009041180A1 PCT/JP2008/064556 JP2008064556W WO2009041180A1 WO 2009041180 A1 WO2009041180 A1 WO 2009041180A1 JP 2008064556 W JP2008064556 W JP 2008064556W WO 2009041180 A1 WO2009041180 A1 WO 2009041180A1
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WO
WIPO (PCT)
Prior art keywords
switches
capacitors
voltage
battery cells
battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2008/064556
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English (en)
Inventor
Daisuke Kurose
Tetsuro Itakura
Yoshinao Tatebayashi
Nobuo Shibuya
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Toshiba Corp
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Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Publication of WO2009041180A1 publication Critical patent/WO2009041180A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H02J7/56—

Definitions

  • the present invention relates to a protection device for an assembled battery having a function of correcting the dispersion of a voltage among battery cells and an assembled battery system containing the same .
  • a vehicle mounted battery which determines the traveling performance of the electric vehicle and the hybrid vehicle is demanded to have a high voltage of more than several tens volts to enable the motor to be driven.
  • the vehicle mounted battery an assembled battery in which a plurality of battery cells each having a voltage of about 2V are connected in series is used.
  • JP- A 2007-006552 has indicated voltage dispersion correcting circuit for equalizing the voltage of each battery cell using a detection result of a flying capacitor type voltage detection circuit for detecting the voltage of the battery cell. More specifically, JP-A 2007-006552 (KOKAI) includes a charge moving control circuit for controlling movement of charges between the battery cell and the capacitor circuit individually. The charge movement control circuit moves charges from a battery cell having a relatively high voltage to a capacitor circuit based on the voltage condition of each battery cell detected from the flying capacitor type voltage detection circuit and after that, moves the charges of the capacitor to a battery cell having a relatively low voltage. The dispersion of voltage of each battery cell is corrected by such a charge moving operation.
  • JP-A 2007-006552 In the voltage dispersion correcting circuit described in JP-A 2007-006552 (KOKAI), the cell voltage dispersion correcting operation needs to be carried out following a detection result of the voltage of the battery cell by the flying capacitor type voltage detection circuit.
  • an analog-to-digital converter (ADC) is used in the battery cell voltage detection circuit as estimated from a paragraph 0033 thereof.
  • the voltage detection circuit using the ADC is capable of detecting the voltage at a higher precision than the voltage detection circuit using a voltage comparator, power consumption of the ADC is large. Because the voltage detection circuit is always set to ON in order to correct the voltage dispersion of the battery cell, JP-A 2007-006552 has such a problem that the power consumption of the voltage dispersion correcting circuit is large.
  • An object of the present invention is to provide a protection device for an assembled battery having a function of correcting voltage dispersion with low power consumption, and an assembled battery system containing the protection device.
  • a protection device for an assembled battery comprising: a plurality of capacitors arranged corresponding to battery cells of the assembled battery; a plurality of first switches connected between the battery cells and the capacitors so as to sample voltages of the battery cells and hold the voltages in the capacitors; a plurality of second switches to connect in parallel at least two capacitors of the plurality of the capacitors; and a controller which controls the first switches and the second switches .
  • a protection device for an assembled battery comprising: a plurality of capacitors arranged corresponding to battery cells of the assembled battery; an analog-to-digital converter which converts a voltage held in the capacitors to a digital signal so as to detect the voltages of the battery cells; a plurality of first switches connected between the battery cells and the capacitors so as to sample voltages of the battery cells and hold the voltages in the capacitors; a plurality of second switches to connect in parallel at least two capacitors of the plurality of the capacitors; and a plurality of third switches for transmitting the hold voltage to the analog-to-digital converter, a controller which controls the first switches, the second switches and third switches.
  • an assembled battery system comprising: an assembled battery having a plurality of battery cells connected in series; the protection device.
  • FIG. 1 is a block diagram showing schematically a protection device for an assembled battery according to an embodiment of the present invention and an assembled battery system;
  • FIG. 2 is a circuit diagram showing a protection unit according to a first embodiment
  • FIG. 3 is a flowchart showing the procedure in the first embodiment
  • FIG. 4 is a flowchart showing a modified procedure in the first embodiment
  • FIG. 5 is a circuit diagram showing part of the protection unit according to a third embodiment
  • FIG. 6 is a timing chart showing an operation of a switch in a second embodiment
  • FIG. 7 is a flowchart showing the procedure in the second embodiment.
  • a secondary battery for example, a lithium ion battery is used.
  • An end of the assembled battery 1 is connected to an external connecting terminal 7 and the other end thereof is connected to an external terminal 8 through a control unit 6.
  • the protection device 4 includes a control unit 6 common to protection units 5A to 5D connected to the battery modules 2A to 2D and the battery modules 2A to 2D. Although the protection device 4 may be sometimes incorporated in a different casing from for the assembled battery 1, it may be sometimes incorporated in a casing 9 together with the assembled battery 1 and used as an assembled battery system (called a battery pack) 10 together with the assembled battery 1.
  • a battery pack an assembled battery system
  • FIG. 2 shows one of the protection units 5A to 5D.
  • cell voltage the voltage of each cell (hereinafter referred to as cell voltage) of the battery modules 2A to 2D reaches a charge prohibiting voltage at the time of charging
  • the protection units 5A to 5D execute charge prohibiting operation and when the cell voltage reaches a discharge prohibiting voltage at the time of discharge, execute a discharge prohibiting operation as its basic function.
  • description of such a basic function is omitted here.
  • two battery cells Bl and B2 are represented as the cell battery contained in the battery module corresponding to a protection unit, actually, a plurality of the cell batteries exist as described above.
  • the protection device corrects the dispersion of the cell voltage with low power consumption.
  • various embodiments of the protection units of FIG. 1 will be described in detail.
  • An end of a switch S 3 for sampling the voltage (cell voltage) of the battery cells Bl and B2 (hereinafter referred to as sampling switch) is connected to both ends of the battery cells Bl and B2 as shown in FIG. 2 and the other end of the switch S 3 is connected to both ends of capacitors Cl and C2 corresponding to the cell batteries Bl and B2.
  • a switch (hereinafter referred to as averaging switch) S ⁇ is connected to the capacitors Cl and C2. That is, the averaging switch S ⁇ is connected between one ends of an upper side of the same Figure of the capacitors Cl and C2 and between the other ends of a lower side. When the averaging switch S ⁇ is turned on, the capacitors Cl and C2 are connected in parallel so that the voltages of Cl and C2 are averaged.
  • a microcontroller 100 achieved by the MPU includes a controller 101 for controlling the sampling switches S 3 and the averaging switch S ⁇ and a communication portion 102.
  • the communication portion 102 is provided to communicate with other protection unit and the control unit 6, detailed description of the communication portion 102 is omitted.
  • step SlOl After that, the sampling switch Sg is turned on (step S102) .
  • the sampling switch Ss When the sampling switch Ss is turned on, the cell voltages of the battery cells Bl and B2 are sampled and sampled voltages are held by the capacitors Cl and C2.
  • the averaging switch S ⁇ is turned on (step S103) .
  • the averaging switch S& is turned on, the voltages of the capacitors Cl and C2 are averaged and consequently, the voltages of the battery cells Bl and
  • step S103 whether or not the averaging operation is continued is determined in step S104 and if it is continued, the procedure is returned to step SlOl, in which the above-described operations are repeated.
  • the capacitances of the battery cells Bl and B2 are Cg]_ and Cg2 an d the capacitances of the sampling capacitors Cl and C2 are C.
  • the averaged voltages of the battery cells Bl and B2 are Va and then that the voltage of Bl is Va + ⁇ V and the voltage of B2 is Va - ⁇ V while they are different from each other. That is, the voltage of the battery cell Bl is dispersed in a higher direction while the voltage of the battery cell B2 is dispersed in a lower direction.
  • the sampling switch Ss is turned on so as to sample the voltages of the battery cells Bl and B2 again.
  • the voltages Vl(I), V2(l) of the battery cells Bl and B2 when sampled again are as follows .
  • Vl(I) V 3 + - ⁇ Sl— ⁇ V C B1 + C :D
  • V2(l) V 3 - C B 2 ⁇ V (2) C B 2 +C
  • the voltage dispersion ⁇ V x CBI/(CBI + C) is decreased by C ⁇ V/(CB;I_ + C) from the initial ⁇ V as indicated in the equation (1).
  • discharge is performed to the capacitor Cl, thereby the voltage being dropped.
  • the voltage dispersion ⁇ V x Cg]_/ (C ⁇ i + C) is increased by C ⁇ V/ (C B 2 + C) from the initial ⁇ V x Cg2 (C ⁇ 2 + C) as indicated in the equation (2) .
  • charging is carried out from the capacitor C2, so that the voltage is raised.
  • the voltages Vl(N) and V2 (N) of the battery cells Bl and B2 are as follows.
  • Vl(N) V a + - ⁇ l— ⁇ V (3)
  • M log_ ⁇ (6) c B1 +c More specifically, assuming that the ratio between the capacitance Cg ] _ of the battery cell Bl and the capacitance C of the capacitors Cl and C2 is 10000:1, M of the equation (6) is 23,000. Although a case which the dispersion of the cell voltage is set to 1/10 is considered in this example, actually, N is selected so that the voltage dispersion is reduced to a demanded value .
  • the result of voltage detection of the battery cell by the voltage detection circuit using the ADC is not required unlike JP-A 2007-006552 (KOKAI), the dispersion of the cell voltage can be corrected by only on/off of the averaging switch S&. That is, the voltage dispersion can be corrected not accompanied by power consumption by the voltage detection circuit using the ADC.
  • the battery cell executes charging as well as discharging at the time of correction of the voltage dispersion, the service life of the battery is prolonged, which is an advantage of the present invention.
  • step S102 the procedure proceeds to step S103, in which the averaging switch S j ⁇ is turned on.
  • the sampling switch S s may be turned off and the procedure may be moved to step S103, in which the averaging switch S ⁇ is turned on, as shown in FIG. 4.
  • the quantity of devices is reduced by sharing at least part of elements of the flying capacitor type voltage detection circuit and the voltage dispersion correcting circuit in the protection device.
  • various embodiments of the protection device of FIG. 2 will be described in detail.
  • the capacitors Cl and C2 for averaging the cell voltage described previously serve as a flying capacitor in the flying capacitor type voltage detection circuit.
  • the microcontroller 100 includes an analog-to-digital converter (ADC) 103.
  • ADC analog-to-digital converter
  • Transmission switches Sl, S2 for transmitting a hold voltage of the capacitors Cl and C2 are placed between both ends of the capacitors Cl and C2 and the ADC 103.
  • the cell voltages that is, the voltages of the battery cells Bl and B2 are sampled and held in the capacitors Cl and C2 and transmitted to the ADC 103 by the transmission switches Sl, S2 and quantized to detect the cell voltages .
  • step S201 all the switches Ss, S ⁇ , Sl and S2 are turned off.
  • step S202 the sampling switch S 3 is turned on.
  • the sampling switch S 3 is turned on, the cell voltages of the battery cells Bl and B2 are sampled at the same time and after that, the sampling switch S 3 is turned off so as to hold the sampled voltage in the capacitors Cl and C2 (step S203) .
  • step S207 if it is determined that the voltages of all the capacitors Cl and C2 are detected under voltage detection mode in step S207, the procedure proceeds to step S208, in which the averaging switch S ⁇ is turned on, so that the voltages of the capacitors Cl and C2 are averaged, thereby the voltages of the battery cells Bl and B2 being averaged.
  • step S208 whether or not the averaging operation is continued is determined in step S209 and if it is continued, the procedure is returned to step S201, in which the above-described operation is repeated.
  • the voltage detection function and the cell voltage dispersion correcting function can be achieved only by adding the averaging switch S ⁇ to the conventional flying capacitor type voltage detection circuit and changing the control sequence of the switch controller 101. Further, because in this embodiment, the cell voltage dispersion correcting operation is carried out regardless of whether or not the voltage detection is executed, the number of the averaging operation (on/off of averaging switch Ss) needs to be matched with the number of the voltage detection. For example, if it is desired to eliminate the dispersion correction quickly, the number of the averaging operation is set larger than that of the voltage detection.
  • the averaging operation may be carried out only when the voltage is detected as required, by omitting the processing of step S204 of FIG. 7. In this case, the dispersion of the cell voltage is eliminated successively with repetition of the voltage detection.
  • the voltages are averaged by connecting the capacitors Cl and C2 connected to each of the two battery cells Bl and B2, if two or more battery cells are connected in series, it is permissible to connect two or more capacitors corresponding to each battery cell in parallel so as to average the voltages. In this case, plural capacitors may be divided to some groups and each group may be averaged. However, if all the capacitors are connected in parallel so as to average the voltages, the voltage dispersion among all the battery cells can be corrected at the same time.

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

L'invention porte sur un dispositif de protection pour une batterie assemblée, lequel dispositif comprend une pluralité de condensateurs (Cl, C2), une pluralité de premiers commutateurs (Ss) connectés entre des piles de batterie (Bl, B2) de la batterie assemblée et les condensateurs (Cl, C2) de façon à échantillonner des tensions des piles de batterie et maintenir les tensions dans les condensateurs (Cl, C2), une pluralité de seconds commutateurs (SA) pour connecter en parallèle au moins deux condensateurs (Cl, C2) de la pluralité de condensateurs, et un contrôleur (101) qui commande les premiers commutateurs (Ss) et les seconds commutateurs (SA).
PCT/JP2008/064556 2007-09-26 2008-08-07 Dispositif de protection pour batterie assemblée et système de batterie assemblée le contenant Ceased WO2009041180A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007-249507 2007-09-26
JP2007249507A JP2009081949A (ja) 2007-09-26 2007-09-26 組電池の保護装置及びこれを含む組電池システム

Publications (1)

Publication Number Publication Date
WO2009041180A1 true WO2009041180A1 (fr) 2009-04-02

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JP (1) JP2009081949A (fr)
WO (1) WO2009041180A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7923151B2 (en) 2003-09-18 2011-04-12 Commonwealth Scientific And Industrial Research Organisation High performance energy storage devices
US9203116B2 (en) 2006-12-12 2015-12-01 Commonwealth Scientific And Industrial Research Organisation Energy storage device
US9401508B2 (en) 2009-08-27 2016-07-26 Commonwealth Scientific And Industrial Research Organisation Electrical storage device and electrode thereof
US9450232B2 (en) 2009-04-23 2016-09-20 Commonwealth Scientific And Industrial Research Organisation Process for producing negative plate for lead storage battery, and lead storage battery
US9508493B2 (en) 2009-08-27 2016-11-29 The Furukawa Battery Co., Ltd. Hybrid negative plate for lead-acid storage battery and lead-acid storage battery
US9524831B2 (en) 2009-08-27 2016-12-20 The Furukawa Battery Co., Ltd. Method for producing hybrid negative plate for lead-acid storage battery and lead-acid storage battery
US9647467B2 (en) 2009-10-19 2017-05-09 4Esys Nv System and method for balancing energy storage devices
US9666860B2 (en) 2007-03-20 2017-05-30 Commonwealth Scientific And Industrial Research Organisation Optimised energy storage device having capacitor material on lead based negative electrode
US9812703B2 (en) 2010-12-21 2017-11-07 Commonwealth Scientific And Industrial Research Organisation Electrode and electrical storage device for lead-acid system
US20210313813A1 (en) * 2018-09-06 2021-10-07 Panasonic Intellectual Property Management Co., Ltd. Energy transfer circuit and power storage system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5645732B2 (ja) * 2011-03-30 2014-12-24 株式会社ケーヒン 電池電圧制御装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998015047A1 (fr) * 1996-10-03 1998-04-09 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Dispositif de stockage d'electricite
GB2337166A (en) * 1998-05-07 1999-11-10 Ford Motor Co Balancing charges in a plurality of batteries
EP0992811A2 (fr) * 1998-10-06 2000-04-12 Hitachi, Ltd. Appareil et méthode de commande pour batterie
JP2002159146A (ja) * 2000-09-25 2002-05-31 Amita Technologies Inc Ltd 直列に接続した蓄電器の電圧平衡装置及びその方法
US20040113586A1 (en) * 2002-12-13 2004-06-17 Seng-Feng Chen Charge-type voltage balancing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998015047A1 (fr) * 1996-10-03 1998-04-09 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Dispositif de stockage d'electricite
GB2337166A (en) * 1998-05-07 1999-11-10 Ford Motor Co Balancing charges in a plurality of batteries
EP0992811A2 (fr) * 1998-10-06 2000-04-12 Hitachi, Ltd. Appareil et méthode de commande pour batterie
JP2002159146A (ja) * 2000-09-25 2002-05-31 Amita Technologies Inc Ltd 直列に接続した蓄電器の電圧平衡装置及びその方法
US20040113586A1 (en) * 2002-12-13 2004-06-17 Seng-Feng Chen Charge-type voltage balancing device

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7923151B2 (en) 2003-09-18 2011-04-12 Commonwealth Scientific And Industrial Research Organisation High performance energy storage devices
US8232006B2 (en) 2003-09-18 2012-07-31 Commonwealth Scientific And Industrial Research Organisation High performance energy storage devices
US9203116B2 (en) 2006-12-12 2015-12-01 Commonwealth Scientific And Industrial Research Organisation Energy storage device
US9666860B2 (en) 2007-03-20 2017-05-30 Commonwealth Scientific And Industrial Research Organisation Optimised energy storage device having capacitor material on lead based negative electrode
US9450232B2 (en) 2009-04-23 2016-09-20 Commonwealth Scientific And Industrial Research Organisation Process for producing negative plate for lead storage battery, and lead storage battery
US9401508B2 (en) 2009-08-27 2016-07-26 Commonwealth Scientific And Industrial Research Organisation Electrical storage device and electrode thereof
US9508493B2 (en) 2009-08-27 2016-11-29 The Furukawa Battery Co., Ltd. Hybrid negative plate for lead-acid storage battery and lead-acid storage battery
US9524831B2 (en) 2009-08-27 2016-12-20 The Furukawa Battery Co., Ltd. Method for producing hybrid negative plate for lead-acid storage battery and lead-acid storage battery
US9647467B2 (en) 2009-10-19 2017-05-09 4Esys Nv System and method for balancing energy storage devices
US9812703B2 (en) 2010-12-21 2017-11-07 Commonwealth Scientific And Industrial Research Organisation Electrode and electrical storage device for lead-acid system
US20210313813A1 (en) * 2018-09-06 2021-10-07 Panasonic Intellectual Property Management Co., Ltd. Energy transfer circuit and power storage system
US11894702B2 (en) * 2018-09-06 2024-02-06 Panasonic Intellectual Property Management Co., Ltd. Energy transfer circuit and power storage system

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