WO2022269832A1 - Circuit de commande de décharge - Google Patents

Circuit de commande de décharge Download PDF

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Publication number
WO2022269832A1
WO2022269832A1 PCT/JP2021/023856 JP2021023856W WO2022269832A1 WO 2022269832 A1 WO2022269832 A1 WO 2022269832A1 JP 2021023856 W JP2021023856 W JP 2021023856W WO 2022269832 A1 WO2022269832 A1 WO 2022269832A1
Authority
WO
WIPO (PCT)
Prior art keywords
discharge
battery
battery module
control circuit
discharge control
Prior art date
Application number
PCT/JP2021/023856
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/JP2021/023856 priority Critical patent/WO2022269832A1/fr
Priority to JP2023529345A priority patent/JP7461093B2/ja
Publication of WO2022269832A1 publication Critical patent/WO2022269832A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • 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 discharge control circuit.
  • lithium ion secondary batteries with high energy density are often used as battery power sources for driving motors.
  • Electric vehicles have a motor drive system that requires a large current to drive heavy objects, and the discharge current during the discharge of the lithium-ion secondary battery is the cause of the risk of ignition due to variations in the driving of the electric vehicle. Therefore, it is important to avoid the risk of ignition by appropriate discharge control.
  • the present invention has been made in view of such a background, and aims to provide a technique capable of performing appropriate discharge control.
  • the main invention of the present invention for solving the above problems is a discharge control circuit, which has a battery cell group and an energization interrupting element for outputting or stopping the discharge output of the battery cell group, and supplies power to a load.
  • the discharge current from the battery module exceeds a current threshold determined according to the voltage or temperature of the battery module, the current cut-off element is used to discharge the battery module group. Stop output.
  • FIG. 1 is a circuit block diagram showing an outline of a configuration of a battery module 2 according to this embodiment;
  • FIG. 1 is a circuit block diagram showing an outline of a configuration of a discharge control circuit 100 according to this embodiment;
  • FIG. FIG. 5 is a graph showing an outline of the safety characteristics of the discharge control circuit 100 according to the present embodiment during overcurrent discharge of the lithium-ion secondary battery.
  • 1 is a circuit block diagram showing an outline of a configuration of a discharge control circuit charge 101 according to this embodiment;
  • FIG. 3 is a flow chart showing an outline of control of the main controller 12 of the discharge control circuit 101 according to the present embodiment;
  • FIG. FIG. 4 is a graph showing an outline of safety characteristics of the discharge control circuit 101 according to the present embodiment during overcurrent discharge of the lithium-ion secondary battery.
  • the battery module 2 includes a high-voltage rated battery cell group 1H in which a plurality of lithium-ion secondary battery cells are connected in series, and an FET 4 as an energization interrupting element for outputting or stopping the discharge output. connect to terminal 5 through
  • the module controller 3 detects the voltage of the battery cell group 1H or the current of the battery cell group 1H, that is, the voltage appearing across the shunt resistor 6, and turns on or off the FET 4 according to the detection result. Controls output or stop of discharge output from terminal 5 .
  • a discharge control circuit 100 connects a plurality of battery modules 2 in series to form a battery module group 2, and applies the output voltage of the battery module group 2 to a load 9 via a fuse 8.
  • the load 9 is, for example, a motor drive circuit including an electric vehicle motor (not shown) and an inverter.
  • lithium ion secondary batteries may ignite due to abnormal heat generation inside the battery cell if the discharge continues for a predetermined time or longer at a current value exceeding a predetermined value.
  • the relationship, that is, the safety characteristic is a solid line 1 drawn as a generally downwardly convex curve with respect to two axes consisting of a current value axis and a time axis.
  • the current value is relatively small, such as the current value Ix in FIG.
  • the lithium-ion secondary battery may ignite first without the fuse element blowing in the area, and further, due to variations in charging before the start of overcurrent discharge or variations in remaining capacity between battery cells in the battery module.
  • an overcharged state that is, an overvoltage state, or when the temperature of the battery module during discharge is high, as shown by the solid line 2
  • the characteristic shifts to shorten the time until ignition as a whole.
  • the issue of safety design matching which has and avoids said ignition to varying safety characteristics for said various conditions, is important.
  • the discharge control circuit 101 has the same configuration as the discharge circuit 100 without the fuse 8, and the main controller 12 communicates with the battery modules 2 using the insulated communication signal 3 to perform the battery
  • the information in the module 2 is acquired, and the FET 4 in the battery module 2 is instructed to be turned on or off as necessary according to the flowchart shown later.
  • Step 1 the main controller 12 of the discharge circuit 101 detects whether the load 9 is being driven.
  • the driving of the load 9 is detected by a method in which the main controller 12 detects the state of the load 9 using communication (not shown), or a method in which the discharge current of the battery module 2 is detected using the insulating communication signal 3. Also good. If it is determined in Step 1 that the load 9 is not being driven, that is, the electric vehicle is stopped or has been charged, the process proceeds to Step 2, where the voltage of the battery cell group 1H in the battery module 2 is detected.
  • Step 4 When it is determined that the voltage of at least one lithium-ion secondary battery cell in the battery cell group 1H of any one battery module 2 out of the battery module 2 groups has exceeded a predetermined value, the process proceeds to Step 4, where the overcurrent determination threshold is set to trip. While the characteristic B is selected, if it is determined that the voltage of one of the lithium ion secondary battery cells in the two groups of battery modules does not exceed a predetermined value, the process proceeds to Step 5, and the trip characteristic A is used as the overcurrent determination threshold. Select and store, and return to Step1.
  • Step 1 after selecting the trip characteristic A or B as the overcurrent determination threshold, it is detected whether or not the load 9 is being driven.
  • the process proceeds to Step 6, measures the discharge current value of the battery module 22, and proceeds to Step 7.
  • Step 7 the temperature of the battery cell group 1H of the battery module 2 is detected, and when it is determined that the temperature of the battery cell group 1H exceeds a predetermined value, the process proceeds to Step 8, and the trip characteristic C is set as the overcurrent determination threshold.
  • the process proceeds to Step 9, and the trip characteristic B is selected as the overcurrent determination threshold.
  • the trip characteristics B and C are the two-dot chain line B and the two-dot chain line C that draw downward convex curves with respect to the two axes of the current value axis and the time axis shown in the graph of FIG.
  • the ignition characteristics of the lithium-ion secondary battery shown correspond to the fact that the time to ignition is shortened according to the temperature of the battery cell.
  • Step 10 it is detected whether or not the discharge current and discharge time of the battery module 2 exceed the trip characteristics B or C selected in the previous Step.
  • the FETs 4 of all the battery modules 2 are turned off to stop the output of the battery module 2 group.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

Le problème décrit par la présente invention est de permettre une commande appropriée de la décharge électrique. La solution selon l'invention porte sur un circuit de commande de décharge comprenant un groupe de cellules de batterie et un élément d'application/interruption de courant qui délivre ou arrête une sortie de décharge électrique du groupe de cellules de batterie, le circuit étant connecté à des modules de batterie pour fournir de l'énergie à une charge, et l'élément d'application/interruption de courant étant utilisé pour arrêter la sortie de décharge électrique du groupe de modules de batterie dans les cas où le courant de décharge provenant des modules de batterie dépasse une valeur de seuil de courant déterminée en fonction de la tension ou de la température des modules de batterie.
PCT/JP2021/023856 2021-06-23 2021-06-23 Circuit de commande de décharge WO2022269832A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2021/023856 WO2022269832A1 (fr) 2021-06-23 2021-06-23 Circuit de commande de décharge
JP2023529345A JP7461093B2 (ja) 2021-06-23 2021-06-23 放電制御回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/023856 WO2022269832A1 (fr) 2021-06-23 2021-06-23 Circuit de commande de décharge

Publications (1)

Publication Number Publication Date
WO2022269832A1 true WO2022269832A1 (fr) 2022-12-29

Family

ID=84545414

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/023856 WO2022269832A1 (fr) 2021-06-23 2021-06-23 Circuit de commande de décharge

Country Status (2)

Country Link
JP (1) JP7461093B2 (fr)
WO (1) WO2022269832A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11108969A (ja) * 1997-08-08 1999-04-23 Harness Syst Tech Res Ltd 過電流検知回路
JP2012009339A (ja) * 2010-06-25 2012-01-12 Hitachi Maxell Energy Ltd 電池パック及び連結電池パック
JP2014027803A (ja) * 2012-07-27 2014-02-06 Hitachi Koki Co Ltd 電源装置
JP2016082642A (ja) * 2014-10-14 2016-05-16 株式会社豊田自動織機 過電流異常検出装置及び過電流異常検出方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11108969A (ja) * 1997-08-08 1999-04-23 Harness Syst Tech Res Ltd 過電流検知回路
JP2012009339A (ja) * 2010-06-25 2012-01-12 Hitachi Maxell Energy Ltd 電池パック及び連結電池パック
JP2014027803A (ja) * 2012-07-27 2014-02-06 Hitachi Koki Co Ltd 電源装置
JP2016082642A (ja) * 2014-10-14 2016-05-16 株式会社豊田自動織機 過電流異常検出装置及び過電流異常検出方法

Also Published As

Publication number Publication date
JP7461093B2 (ja) 2024-04-03
JPWO2022269832A1 (fr) 2022-12-29

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