PROTECTION CIRCUIT, IN-VEHICLE POWER STORAGE DEVICE, AND CONTROL METHOD

• Main Authors: MATSUDA YUKI, KUNITA SATOSHI, WADA NAOYA, FUJIMATSU MASAKATSU, SUGIURA AKIMASA
• Format: Patent
• Language: English; Japanese
• Published: 17.12.2020
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

To provide a protection circuit for a power storage element using a bypass circuit for preventing overcharge.SOLUTION: A protection circuit 120 of a power storage element 62 includes a cutoff switch 55 that cuts off a current of the power storage element 62, a bypass circuit 150 connected in parallel with the cutoff switch 55, and a control unit 130. The cutoff switch 55 is composed of a first FET 55A and a second FET 55B. The bypass circuit 150 allows discharge from the power storage element 62 to a vehicle while the current is cut off by the cutoff switch 55, and the control unit 130 switches a current path of a discharge current from a path passing through the bypass circuit 150 to a path passing through the cutoff switch 55 when the discharge current flowing through the bypass circuit 150 exceeds a limit value.SELECTED DRAWING: Figure 9 【課題】過充電防止用のバイパス回路を用いた蓄電素子の保護回路を提供する。【解決手段】蓄電素子６２の保護回路１２０は、蓄電素子６２の電流を遮断する遮断スイッチ５５と、遮断スイッチ５５と並列に接続されたバイパス回路１５０と、制御部１３０と含む。遮断スイッチ５５は、第１ＦＥＴ５５Ａと第２ＦＥＴ５５Ｂにより構成される。バイパス回路１５０は、遮断スイッチ５５による電流遮断中に、蓄電素子６２から車両への放電を許容し、制御部１３０は、バイパス回路１５０に流れる放電電流が制限値以上になった場合、放電電流の電流経路をバイパス回路１５０を通る経路から、遮断スイッチ５５を通る経路に切り換える。【選択図】図９