Power supply system and electric vehicle

1 . A power supply system, comprising:

a first loop, wherein the first loop comprises a DC-DC conversion module connected in parallel to a first load, each first terminal of the DC-DC conversion module and the first load that are connected in parallel is grounded, and the first loop does not contain storage battery;

a second loop, wherein the second loop comprises a storage battery connected in parallel to a second load, and each first terminal of the storage battery and the second load that are connected in parallel is grounded; and

a switch unit, wherein the switch unit comprises a switch, the switch is coupled in series between a second terminal of each of the DC-DC conversion module and the first load and a second terminal of each of the storage battery and the second load, and the switch is in an on-state by default.

2 . The power supply system according to claim 1 , wherein the switch unit further comprises a control module and a sensor, and the control module is configured to: in respond to receiving a sensing signal from the sensor, send a control signal to the switch.

3 . The power supply system according to claim 2 , wherein the sensor comprises a current sensor, and the current sensor is coupled in series to the switch; and

the control module is further configured to: receive a current value from the current sensor, and send a turn-off signal to the switch in response to determining that the received current value is greater than a current threshold.

4 . The power supply system according to claim 2 , wherein the sensor comprises a voltage sensor, and the voltage sensor is coupled in parallel to the switch; and

the control module is further configured to: receive a voltage value from the voltage sensor, and send a turn-off signal to the switch in response to determining that the received voltage value is greater than a voltage threshold.

5 . The power supply system according to claim 4 , wherein the switch unit further comprises a timer, and the timer is coupled to the control module;

the control module is further configured to start the timer upon determining that the received voltage value is greater than the voltage threshold;

when the control module determines that the received voltage value is greater than the voltage threshold for a duration that is greater than a duration threshold, a turn-off signal is sent to the switch; and

when the control module determines that the received voltage value is greater than the voltage threshold for a duration that is less than the duration threshold, no processing is performed.

6 . The power supply system according to claim 3 , wherein the control module is further configured to: after sending the turn-off signal to the switch, report to a vehicle controller that the switch is in an off-state.

7 . The power supply system according to claim 2 , wherein the sensor comprises a temperature sensor, and the temperature sensor is coupled in series to the switch; and

the control module is further configured to: receive a temperature value from the temperature sensor, and determine that the switch is disabled in response to determining that the received temperature value is greater than a temperature threshold.

8 . The power supply system according to claim 7 , wherein the control module is further configured to: after determining that the switch is disabled, report to a vehicle controller that the switch is disabled.

9 . An electric vehicle, comprising the power supply system according to claim 1 .

10 . The electric vehicle according to claim 9 , wherein the electric vehicle comprises a vehicle controller, and the vehicle controller is configured to exit an automatic driving mode in response to receiving, from a control module, a signal that the switch is turned off or a signal that the switch is disabled.

11 . A power supply system, comprising:

a first loop, wherein the first loop comprises a DC-DC conversion module connected in parallel to a first load, and each first terminal of the DC-DC conversion module and the first load that are connected in parallel is grounded;

a second loop, wherein the second loop comprises a storage battery connected in parallel to a second load, and each first terminal of the storage battery and the second load that are connected in parallel is grounded; and

a switch unit, wherein the switch unit comprises:

a switch coupled in series between a second terminal of each of the DC-DC conversion module and the first load and a second terminal of each of the storage battery and the second load, the switch being in an on-state by default;

a sensor comprising a voltage sensor coupled in parallel to the switch; and

a control module configured to receive a voltage value from the voltage sensor, and send a turn-off signal to the switch in response to determining that the received voltage value is greater than a voltage threshold.

12 . An electric vehicle, comprising:

a power supply system, comprising:

a first loop, wherein the first loop comprises a DC-DC conversion module connected in parallel to a first load, and each first terminal of the DC-DC conversion module and the first load that are connected in parallel is grounded;

a second loop, wherein the second loop comprises a storage battery connected in parallel to a second load, and each first terminal of the storage battery and the second load that are connected in parallel is grounded; and

a switch unit, wherein the switch unit comprises a switch, the switch is coupled in series between a second terminal of each of the DC-DC conversion module and the first load and a second terminal of each of the storage battery and the second load, and the switch is in an on-state by default; and

a vehicle controller configured to exit an automatic driving mode in response to receiving, from a control module, a signal that the switch is turned off or a signal that the switch is disabled.