CN-121989693-A - Battery management system and vehicle

Abstract

The present disclosure provides a battery management system and a vehicle, the battery management system (100) comprising a first terminal (101) connected to a high voltage battery (300), a second terminal (102) connected to an electronic control unit (200), an electrical isolation circuit (110) configured to receive a first current from the electronic control unit (200) through the second terminal (102), a current sensing unit (120) configured to sense a second current output by the electrical isolation circuit (110) and to generate a disconnection signal in response to the second current exceeding a first threshold, and a battery disconnection unit (130) configured to disconnect the high voltage battery (300) from a load connected to the high voltage battery (300) in response to the disconnection signal, wherein the electrical isolation circuit (110) comprises an opto-electric coupling circuit.

Inventors

• QIU XIAOFEI

Assignees

• 罗伯特·博世有限公司

Dates

Publication Date

20260508

Application Date

20241104

Claims (8)

1. 1. A battery management system, comprising: A first terminal connected to the high voltage battery; A second terminal connected to the electronic control unit; An electrical isolation circuit configured to receive a first current from the electronic control unit through the second terminal; A current sensing unit configured to sense a second current output by the electrical isolation circuit and generate a disconnection signal in response to the second current exceeding a first threshold; a battery disconnect unit configured to disconnect the high voltage battery from a load connected to the high voltage battery in response to the disconnect signal, wherein the electrical isolation circuit includes a photo-coupling circuit.
2. 2. The battery management system of claim 1 wherein an input of the optocoupler circuit is connected to the second terminal and an output of the optocoupler circuit is connected to the current sensing unit.
3. 3. The battery management system of claim 1 wherein the optocoupler circuit comprises a light emitting diode and a photosensitive element optically coupled to each other.
4. 4. The battery management system of claim 3 wherein the photosensitive element comprises at least one of a photoresistor, a photodiode, a phototransistor, a photocell.
5. 5. The battery management system of claim 3 wherein the electronic control unit applies the first current to the light emitting diode via the second terminal in the event of a collision, In response to the first current applied by the electronic control unit, the light emitting diode emits a first light, The resistance state of the photosensitive element changes in response to the first light emitted by the light emitting diode.
6. 6. The battery management system of claim 5 wherein the current sensing unit senses the second current exceeding the first threshold and generates the disconnect signal in response to a change in the resistance state of the photosensitive element.
7. 7. The battery management system of claim 1 wherein the current sensing unit comprises a differential current amplifier.
8. 8. A vehicle comprising an electronic control unit, a high voltage battery and a battery management system according to any one of claims 1 to 7.

Description

Battery management system and vehicle Technical Field The present disclosure relates to the field of battery management technology, and in particular, to a battery management system and a vehicle including the same. Background In electric vehicles (ELECTRIC VEHICLE, EV), hybrid ELECTRIC VEHICLE (HEV), or plug-in HEV (PHEV), high Voltage (HV) batteries are used to power the electric motor. The crash event may cause the high voltage battery to be damaged, thereby causing the high voltage battery to be shorted and causing the vehicle to fire. To prevent fires in a crash event, a battery disconnect airbag (airbag) is typically used to disconnect the high-voltage battery network. But the cost of such an airbag is high and the cost of repairing it after a crash event is also high. In view of the above-described design defect, a scheme of detecting an ignition (ignition) current as an input through a differential current amplifier in a Battery management system (Battery MANAGEMENT SYSTEM, BMS) to cut off connection of a high-voltage Battery has been proposed. However, in this approach, the electronic control unit (Electronic Control Unit, ECU) may be affected by a differential current amplifier in the battery management system. Disclosure of Invention The present disclosure provides a battery management system and a vehicle including the battery management system to avoid an influence of a differential current amplifier in the battery management system on an electronic control unit. The embodiment of the disclosure provides a battery management system comprising a first terminal connected to a high-voltage battery, a second terminal connected to an electronic control unit, an electrical isolation circuit configured to receive a first current from the electronic control unit through the second terminal, a current sensing unit configured to sense a second current output by the electrical isolation circuit and generate a disconnection signal in response to the second current exceeding a first threshold, and a battery disconnection unit configured to disconnect the high-voltage battery from a load connected to the high-voltage battery in response to the disconnection signal, wherein the electrical isolation circuit comprises a photoelectric coupling circuit. The disclosed embodiments also provide a vehicle including an electronic control unit, a high voltage battery, and a battery management system according to an embodiment of the disclosure. Drawings FIG. 1 shows a schematic block diagram of a battery management system in the related art sensing ignition current; FIG. 2 shows a schematic circuit diagram of a battery management system of the related art sensing an ignition current; FIG. 3 shows a schematic block diagram of a battery management system according to an embodiment of the present disclosure; Fig. 4 shows a schematic circuit diagram of an electrical isolation circuit in a battery management system according to an embodiment of the present disclosure. Corresponding reference characters indicate corresponding parts throughout the several views of the drawings. Elements in the figures are not necessarily drawn to scale. The configurations shown in the drawings are merely examples and should not be construed as limiting the present disclosure in any way. Detailed Description The accompanying drawings, which are included to provide a further understanding of embodiments of the disclosure and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the detailed embodiment, do not limit the disclosure. The above and other features and advantages will become more readily apparent to those skilled in the art from the description of the detailed embodiments with reference to the accompanying drawings. Fig. 1 shows a schematic block diagram of a battery management system in the related art sensing an ignition current, and fig. 2 shows a schematic circuit diagram of the battery management system in the related art sensing an ignition current. As shown in fig. 1 and 2, a sense resistor in the battery management system is connected between a High Side (HS) and a Low Side (LS) of the electronic control unit, and a differential current amplifier in the battery management system senses an ignition current flowing through the sense resistor. Since the differential current amplifier in the battery management system is directly electrically connected with the electronic control unit, the differential current amplifier may have an influence on the electronic control unit. In addition, there is a ground deviation between the ground GND1 of the electronic control unit and the ground GND2 of the differential current amplifier, and thus current injection from or to the electronic control unit may be caused. Since the input circuit of the battery management system is a high impedance circuit, the electronic control unit is easily affected by electromagnetic compatibility (Electro