WO2022269835A1 - Circuit d'alimentation électrique de batterie - Google Patents

Circuit d'alimentation électrique de batterie Download PDF

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Publication number
WO2022269835A1
WO2022269835A1 PCT/JP2021/023859 JP2021023859W WO2022269835A1 WO 2022269835 A1 WO2022269835 A1 WO 2022269835A1 JP 2021023859 W JP2021023859 W JP 2021023859W WO 2022269835 A1 WO2022269835 A1 WO 2022269835A1
Authority
WO
WIPO (PCT)
Prior art keywords
state
battery cell
power supply
energization
supply circuit
Prior art date
Application number
PCT/JP2021/023859
Other languages
English (en)
Japanese (ja)
Inventor
和征 榊原
Original Assignee
株式会社EViP
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 株式会社EViP filed Critical 株式会社EViP
Priority to PCT/JP2021/023859 priority Critical patent/WO2022269835A1/fr
Publication of WO2022269835A1 publication Critical patent/WO2022269835A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • the present invention relates to a battery power supply circuit.
  • lithium ion secondary batteries with high energy density are often used as battery power sources for driving motors.
  • the present invention has been made in view of such a background, and aims to provide a technology that can take measures against electric leakage.
  • the main invention of the present invention for solving the above problems is a battery power supply circuit comprising a plurality of lithium ion secondary battery cells and a dew condensation sensor. When an earth leakage is detected, the leakage path is cut off.
  • FIG. 1 is a circuit block diagram showing an outline of a configuration of a battery power supply circuit 100 according to this embodiment;
  • FIG. 1 is a circuit block diagram showing an outline of a configuration of a battery power supply circuit 101 according to this embodiment;
  • FIG. 4 is a flow chart diagram showing an outline of control of the main controller 40 of the battery power supply circuit 101 according to the present embodiment.
  • a battery power supply circuit 100 supplies a battery cell group 1 with a high voltage rating, which is formed by connecting a plurality of lithium-ion secondary battery cells in series, to supply or interrupt a charging current and a discharging current.
  • Two FETs 2 connected in series with opposite polarities as cutoff elements are connected in series at two locations between the three battery cell groups 1, and connected to a motor drive circuit 10 represented by an inverter, for example, Power is supplied to drive the motor 11 by turning on all of the FETs 2 .
  • the main controller 4 detects the voltage appearing across the shunt resistor 12 to detect the value of the current flowing through the battery cell group 1, and the no-load state, that is, the discharge current is less than a predetermined value. If this state continues for a predetermined time or more, the insulation signal 3 is used to turn off all of the FETs 2 to ensure insulation.
  • the storage battery 6 is charged by the charging circuit 5 while the battery cell group 1 is being discharged with all of the FETs 2 turned on, and the motor is driven from the battery cell group 1 with all the FETs 2 turned off.
  • the constant voltage source 8 is generated via the regulator 7 so that the main controller 4 and the motor drive circuit 10 can be restarted using the constant voltage source 8. function.
  • the battery power supply circuit 101 includes two FETs 21 connected in series with opposite polarities between the negative electrode of the battery cell group 1 positioned at the lowest potential and the ground.
  • a dew condensation sensor 9 connected to a main controller 40 that is substantially the same as the main controller 4, and a battery connected in parallel via two FETs 20 connected in series with opposite polarities to the battery cell group 1 positioned at the lowest potential. This is a configuration in which a cell group 1 is added.
  • the dew condensation sensor 9 when the dew condensation sensor 9 is used to detect a state in which dew condensation occurs under a long-time no-load state, and a state in which the voltage of at least one battery cell group 1 has decreased, the state is detected.
  • the insulating signal 30 is used to turn off the FET 21 to collectively open the many chaotic leakage paths at one location to prevent overdischarging of the plurality of battery cell groups 1 due to the leakage current. can.
  • the two battery cell groups 1 connected in parallel and positioned at the lowest potential have their absolute capacities doubled by the parallel connection, and the electric leakage due to the formation of a plurality of disorderly electric leakage paths causes The risk of losing the remaining capacity as a backup power supply can be halved. Further, there is an advantage that the cost can be reduced by eliminating the charging circuit 5 of the battery power supply circuit 100 .
  • Step 1 the main controller 40 turns on all the FETs 2 and turns off the FETs 20 using the insulation signal 3 and the insulation signal 30 to supply power to the motor drive circuit 10 .
  • the reason why the FET 20 is turned off is that the battery cell group 1 positioned at the lowest potential is connected in parallel with another battery cell group 1 positioned at the same potential, and the remaining capacity is determined between a plurality of battery cell groups 1 connected in series. This is for the purpose of preventing imbalance.
  • the main controller 40 detects the voltage appearing across the shunt resistor 12 to detect whether the discharge current of the battery cell group 1 is less than a predetermined value.
  • the process proceeds to Step 3 and it is detected whether or not the time in the no-load state exceeds a predetermined value.
  • the process proceeds to Step 4, and all the FETs 2 are turned off and the FET 20 is turned on by using the insulation signal 3 and the insulation signal 30.
  • the purpose of turning on the FET 20 is to increase the absolute capacity for the third to fourth problems and to secure reliability as a backup power supply that functions stably.
  • Step 5 the main controller 40 uses the dew condensation sensor 9 to detect whether dew condensation has occurred. If it is determined that the dew condensation has occurred, the process proceeds to Step 6, and it is detected whether or not the no-load time under the dew condensation condition exceeds a predetermined value. When it is determined that the no-load time under the closed state exceeds a predetermined value, the process proceeds to Step 7, and it is detected whether or not the voltage of at least one battery cell group 1 has decreased, and the at least one battery cell group 1 is detected. voltage has dropped, that is, the remaining capacity of the battery cell group 1 has decreased due to leakage current discharge due to dew condensation, the process proceeds to Step 8, and the FET 21 is turned off.
  • the plurality of chaotic leakage current paths through which a plurality of leakage currents flow starting from the positive electrodes of at least one or more battery cell groups 1 at the time of dew condensation are collectively opened at one point to be accompanied by the leakage current. It is possible to prevent overdischarge failure of the lithium ion secondary battery cell.
  • Step 8 the negative electrode of the battery cell group 1 positioned at the lowest potential is electrically disconnected from the ground. Then, the driver or mechanic manually turns on the bypass switch 50 connected in parallel with the FET 21 to make it conductive, thereby restarting the main controller 40 and the motor drive circuit 10 .

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Le problème décrit par la présente invention est de permettre de mettre en oeuvre des contre-mesures contre une fuite électrique. La solution selon l'invention porte sur un circuit d'alimentation électrique de batterie comprenant une pluralité de cellules de batterie secondaire au lithium-ion et un capteur de condensation, si une fuite électrique est détectée dans un état dans lequel il y a une condensation ou dans un état dans lequel il n'y a pas de charge, la ligne de fuite électrique étant coupée.
PCT/JP2021/023859 2021-06-23 2021-06-23 Circuit d'alimentation électrique de batterie WO2022269835A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/023859 WO2022269835A1 (fr) 2021-06-23 2021-06-23 Circuit d'alimentation électrique de batterie

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/023859 WO2022269835A1 (fr) 2021-06-23 2021-06-23 Circuit d'alimentation électrique de batterie

Publications (1)

Publication Number Publication Date
WO2022269835A1 true WO2022269835A1 (fr) 2022-12-29

Family

ID=84545417

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/023859 WO2022269835A1 (fr) 2021-06-23 2021-06-23 Circuit d'alimentation électrique de batterie

Country Status (1)

Country Link
WO (1) WO2022269835A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009104821A (ja) * 2007-10-22 2009-05-14 Nec Tokin Corp 電池パック
JP2018170904A (ja) * 2017-03-30 2018-11-01 日立オートモティブシステムズ株式会社 電池制御装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009104821A (ja) * 2007-10-22 2009-05-14 Nec Tokin Corp 電池パック
JP2018170904A (ja) * 2017-03-30 2018-11-01 日立オートモティブシステムズ株式会社 電池制御装置

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