Apparatus and method for preventing over-charging of battery

• US 10,414,285 B2
• Filed: 11/15/2017
• Issued: 09/17/2019
• Est. Priority Date: 11/16/2016
• Status: Active Grant

• Current Assignee: Hyundai Mobis Co., Ltd.
• Original Assignee: Hyundai Autron Co., Ltd. (Hyundai Mobis Co., Ltd.)
• Inventors: Park, Jae Seong, Lee, Sang Ho
• Primary Examiner(s): Grant, Robert
• Assistant Examiner(s): Trischler, John T
• Application Number:
  US15/813,825
• Publication Number:
  US 20180134175A1
• Time in Patent Office: 671 Days
• Field of Search: 320162
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

The present invention relates to an apparatus for preventing a battery including a master battery and a slave battery from being over-charged, the apparatus including: a master battery management system (BMS) which determines whether the master battery is over-charged, and turns off a main relay which connects or disconnects between the battery and a motor of a vehicle when the master battery is over-charged as a result of the determination; and a slave BMS which determines whether the slave battery is over-charged, and turns off a charging relay which connects or disconnects between the battery and a charger provided outside the vehicle when the slave battery is over-charged as a result of the determination.

Claims

1. An apparatus for preventing overcharging of a battery including a master battery and a slave battery, the apparatus comprising:

a master battery management system (BMS) configured to determine whether the master battery is over-charged, and turn off a main relay which connects or disconnects between the battery and a motor of a vehicle when the master battery is over-charged as a result of the determination; and

a slave BMS configured to determine whether the slave battery is over-charged, and turn off a charging relay which connects or disconnects between the battery and a charger provided outside the vehicle when the slave battery is over-charged as a result of the determination,

wherein when the master battery is over-charged, the master BMS generates a first over-charging signal and transmits the first over-charging signal to the slave BMS,

when the slave battery is over-charged, the slave BMS generates a second over-charging signal and transmits the second over-charging signal to the master BMS,

the slave BMS turns off the charging relay in response to the first over-charging signal, and

the master BMS turns off the main relay in response to the second over-charging signal,

wherein when the master battery or the slave battery is over-charged, both the main relay and the charging relay are turned off.

2. The apparatus of claim 1, wherein when a voltage of a battery cell included in the master battery is higher than an over-charging reference voltage, the master BMS determines that the master battery is over-charged.

3. The apparatus of claim 1, wherein when a voltage of a battery cell included in the slave battery is higher than an over-charging reference voltage, the slave BMS determines that the slave battery is over-charged.

4. The apparatus of claim 1, wherein when the master battery is over-charged during the charging of the battery, the master BMS transmits the first over-charging signal that notifies the over-charging of the master battery to the slave BMS, and when the slave BMS receives the first over-charging signal, the slave BMS turns off the charging relay.

5. The apparatus of claim 4, wherein when it is determined that the slave battery is over-charged or the first over-charging signal is received from the master BMS, the slave BMS turns off the charging relay.

6. The apparatus of claim 1, wherein when the slave battery is over-charged during the charging of the battery, the slave BMS transmits the second over-charging signal that notifies the over-charging of the slave battery to the master BMS, and when the master BMS receives the second over-charging signal, the master BMS turns off the main relay.

7. The apparatus of claim 6, wherein when it is determined that the master battery is over-charged or the second over-charging signal is received from the slave BMS, the slave BMS turns off the main relay.

8. A method of preventing overcharging of a battery including a master battery and a slave battery, the method comprising:

determining over-charging, in which an over-charged battery is determined between the master battery and the slave battery during charging of the battery;

turning off a main relay which connects or disconnects between the battery and a motor of a vehicle when the master battery is over-charged as a result of the determination in the determining of the over-charging;

transmitting a first over-charging signal, in which a master battery management system (BMS) transmits a first over-charging signal that notifies over-charging of the master battery to a slave BMS; and

turning off a charging relay which connects or disconnects between the battery and a charger provided outside the vehicle when the first over-charging signal is received in the transmitting of the first over-charging signal,

wherein when the master battery is over-charged, both the main relay and the charging relay are turned off.

9. A method of preventing overcharging of a battery including a master battery and a slave battery, the method comprising:

determining over-charging, in which an over-charged battery is determined between the master battery and the slave battery during charging of the battery;

turning off a charging relay, by a slave battery management system (BMS), which connects or disconnects between the battery and a charger of a vehicle provided outside a vehicle when the slave battery is over-charged as a result of the determination in the determining of the over-charging;

transmitting an over-charging signal, in which the slave BMS transmits the over-charging signal that notifies over-charging of the slave battery to a master BMS; and

turning off a main relay, by the master BMS, in which when the over-charging signal is received in the transmitting of the over-charging signal of the over-charging of the slave battery, the battery is connected with a motor of a vehicle or the battery is separated from the motor of the vehicle,

wherein when the slave battery is over-charged, both the main relay and the charging relay are turned off.