Electric vehicle

Abstract

The utility model discloses an electric vehicle which comprises a vehicle frame, a vehicle body covering part, a walking system and a power system, a temperature wake-up circuit is arranged in a battery manager, the temperature wake-up circuit detects the battery temperature of a power battery module, and when the battery temperature is larger than or equal to a preset temperature threshold value, the temperature wake-up circuit starts the walking system. And sending a sleep wake-up signal to the controller through the communication bus. The controller enters a wake-up state from a dormant state according to the dormant wake-up signal and then sends a temperature alarm signal to the alarm according to the dormant wake-up signal received in the wake-up state, and the alarm gives an alarm according to the temperature alarm signal. Therefore, when the controller is in the dormant state and the battery temperature is greater than or equal to the preset temperature threshold value, the temperature awakening circuit can send a dormant awakening signal to the controller to enable the controller to enter the awakening state, and then the controller can send an alarm signal to the alarm, so that all-time temperature monitoring of the power battery module is realized; the safety of the electric vehicle is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, and in particular to an electric vehicle. BACKGROUND

[0002] In the electric vehicle, the power battery may generate a phenomenon such as red-hot surface or smoke due to overuse or high temperature in a long working state. In order to ensure the safety of the power battery and the electric vehicle, the temperature of the battery needs to be monitored. In the prior art, only when the battery management system (BMS) is in the wake-up state, the temperature abnormality fault can be reported to the controller when the temperature is abnormal. The battery management system needs to be woken up by the controller or an external charger. If the power battery generates a temperature abnormality fault when the battery management system and the controller are in the sleep state, the temperature abnormality fault cannot be reported to the controller, and the safety of the electric vehicle is difficult to ensure. CONTENT OF THE UTILITY MODEL

[0003] In view of this, the present application provides an electric vehicle with high safety.

[0004] The present application provides an electric vehicle, comprising: a vehicle frame; a vehicle body covering member, which at least partially covers the vehicle frame; a walking system, which is arranged below the vehicle frame; a power system, which comprises a power battery module, a battery manager and a driving assembly, the power battery module is connected with the battery manager, and the driving assembly is supported by the vehicle frame and connected with the power battery module; the battery manager is used to control the power output of the power battery module to the driving assembly, so that the driving assembly provides driving force for the walking system; the electric vehicle further comprises an electrical system, which comprises a communication bus, a controller and an alarm, the battery manager and the controller are communicatively connected through the communication bus, and the controller is connected with the alarm; the battery manager comprises a temperature wake-up circuit, which is communicatively connected with the controller through the communication bus; the temperature wake-up circuit is used to detect the battery temperature of the power battery module, and when the battery temperature is greater than or equal to a preset temperature threshold, a sleep wake-up signal is sent to the controller through the communication bus; the controller enters the wake-up state from the sleep state according to the sleep wake-up signal, and sends a temperature alarm signal to the alarm; and the alarm sends an alarm according to the temperature alarm signal.

[0005] In a possible implementation, the temperature wake-up circuit comprises a temperature detection module and a control module, the temperature detection module is connected with the control module, and the control module is connected with the communication bus; the temperature detection module is configured to detect the battery temperature; and the control module is configured to send the sleep wake-up signal to the controller through the communication bus when the battery temperature is greater than or equal to the preset temperature threshold.

[0006] In a possible implementation, the control module comprises a control unit, a switch unit and a pull-down resistor, the control unit is connected with the temperature detection module and a control end of the switch unit respectively, a first end of the switch unit is connected with a low-voltage power supply end, a second end of the switch unit is connected with a first end of the pull-down resistor and the communication bus, and a second end of the pull-down resistor is grounded; the control unit is configured to send a switch control signal to the control end of the switch unit when the battery temperature is greater than or equal to the preset temperature threshold; and the switch unit is configured to turn on or turn off according to the switch control signal, so as to send the sleep wake-up signal to the communication bus.

[0007] In a possible implementation, the control module further comprises a pull-up resistor, and the first end of the switch unit is connected with the low-voltage power supply end through the pull-up resistor.

[0008] In a possible implementation, the battery manager further comprises a step-down conversion circuit, and the first end of the switch unit is connected with the power battery module through the step-down conversion circuit, the step-down conversion circuit is configured to provide a battery voltage of the power battery module to the switch unit through the low-voltage power supply end after step-down conversion.

[0009] In a possible implementation, the control module comprises a control unit, a switch unit and a pull-up resistor, the control unit is connected with the temperature detection module and a control end of the switch unit, a first end of the switch unit is connected with a first end of the pull-up resistor and the communication bus, a second end of the switch unit is grounded, and a second end of the pull-up resistor is connected with the low-voltage power supply end; the control unit is configured to send a switch control signal to the control end of the switch unit when the battery temperature is greater than or equal to the preset temperature threshold; and the switch unit is configured to turn on according to the switch control signal, so as to send the sleep wake-up signal to the communication bus.

[0010] In a possible implementation, the temperature detection module includes a temperature sensor connected to the control unit; the temperature sensor is configured to detect the battery temperature and output a wake-up signal to the control unit when the battery temperature is greater than or equal to the preset temperature threshold; and the control unit enters the wake-up state from the sleep state according to the wake-up signal and sends the switch control signal to the control end of the switch unit.

[0011] In a possible implementation, the electrical system further includes a charging interface configured to be connected to a charger; the charging interface includes a communication terminal connected to the communication bus, and the charging interface is configured to receive a charging wake-up signal sent by the charger through the communication terminal when the charging interface is connected to the charger, and the battery manager enters the wake-up state from the sleep state according to the charging wake-up signal.

[0012] In a possible implementation, the communication bus is a one-wire communication bus.

[0013] In a possible implementation, the controller is any one of a vehicle controller, a body controller, and a motor controller.

[0014] In the electric vehicle provided in the present application, the temperature wake-up circuit is arranged in the battery manager, the battery temperature of the power battery module is detected by the temperature wake-up circuit, and the temperature wake-up circuit sends a sleep wake-up signal to the controller through the communication bus when the battery temperature is greater than or equal to the preset temperature threshold. The controller enters the wake-up state from the sleep state according to the sleep wake-up signal, and the controller continues to receive the sleep wake-up signal in the wake-up state and sends a temperature alarm signal to the alarm according to the sleep wake-up signal received in the wake-up state, and the alarm sends an alarm according to the temperature alarm signal. Therefore, when the controller is in the sleep state and the temperature wake-up circuit sends the sleep wake-up signal to the controller to make the controller enter the wake-up state when the battery temperature is greater than or equal to the preset temperature threshold, the controller can send an alarm signal to the alarm to remind the user that the temperature of the power battery module is abnormal, so that full-time temperature monitoring of the power battery module is realized, thereby improving the safety of the electric vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a schematic diagram of an electric vehicle provided in an embodiment of the present application.

[0016] Figure 2 FIG. 2 is a schematic diagram of part of the modules of the electric vehicle provided in the embodiment of the present application.

[0017] Figure 3 FIG. 3 is a schematic diagram of part of the modules of the electric vehicle provided in another embodiment of the present application.

[0018] Figure 4 is a partial circuit structure schematic diagram of a power system and a controller provided by an embodiment of the present application.

[0019] Figure 5 is a partial circuit structure schematic diagram of a power system and a controller provided by another embodiment of the present application.

[0020] Figure 6 is a partial circuit structure schematic diagram of an electric vehicle provided by yet another embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts are within the scope of protection of the present application.

[0023] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, thus, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0024] The following will be combined with the accompanying drawings to make a detailed description of some embodiments of the present application. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] As shown in Figure 1 , an electric vehicle 100 is provided by an embodiment of the present application, the electric vehicle 100 comprises a vehicle frame 11, a vehicle body cover 12, a walking system 13 and a power system 14. The vehicle frame 11 constitutes a basic framework of the electric vehicle 100, the vehicle body cover 12 is at least partially arranged on the vehicle frame 11, and the vehicle body cover 12 is used to protect various parts and components inside the electric vehicle 100. The walking system 13 is arranged below the vehicle frame 11, and the walking system 13 can comprise front wheels 131 and rear wheels 132, wherein the electric vehicle 100 is driven by rotating the front wheels 131 and the rear wheels 132. The power system 14 is used to provide driving force for the walking system 13 to drive the front wheels 131 and the rear wheels 132 of the walking system 13 to rotate, so as to drive the electric vehicle 100 to move.

[0026] In the embodiments of the present application, the electric vehicle 100 can be any one of an electric two-wheeled vehicle, an electric three-wheeled vehicle, and an electric four-wheeled vehicle. Figure 1 The electric vehicle 100 shown is an electric two-wheeled vehicle.

[0027] As Figure 2 The power system 14 includes a power battery module 141, a battery manager 142, and a driving assembly (not shown in the figure).

[0028] The power battery module 141 is connected to the battery manager 142, and the driving assembly is supported by the vehicle frame 11 and connected to the power battery module 141; the battery manager 142 is configured to control the output of electric energy of the power battery module 141 to the driving assembly, so that the driving assembly provides driving force for the walking system 13.

[0029] The electric vehicle 100 further includes an electrical system 15, which includes a communication bus 151, a controller 152, and an alarm 153. The battery manager 142 and the controller 152 are communicatively connected through the communication bus 151, and the controller 152 is connected to the alarm 153.

[0030] The battery manager 142 includes a temperature wake-up circuit 1421, which is communicatively connected to the controller 152 through the communication bus 151. The temperature wake-up circuit 1421 is configured to detect the battery temperature of the power battery module 141, and when the battery temperature is greater than or equal to a preset temperature threshold, send a sleep wake-up signal to the controller 152 through the communication bus 151. The controller 152 enters the wake-up state from the sleep state according to the sleep wake-up signal, and sends a temperature alarm signal to the alarm 153. The alarm 153 issues an alarm according to the temperature alarm signal.

[0031] In the embodiment of the present application, the temperature wake-up circuit 1421 is arranged in the battery manager 142, the battery temperature of the power battery module 141 is detected by the temperature wake-up circuit 1421, and the temperature wake-up circuit 1421 sends the hibernation wake-up signal to the controller 152 through the communication bus 151 when the battery temperature is greater than or equal to the preset temperature threshold. The controller 152 enters the wake-up state from the hibernation state according to the hibernation wake-up signal, and the controller 152 continues to receive the hibernation wake-up signal in the wake-up state, and then sends the temperature alarm signal to the alarm 153 according to the hibernation wake-up signal received in the wake-up state, and the alarm 153 issues an alarm according to the temperature alarm signal. Therefore, when the controller 152 is in the hibernation state, and the temperature wake-up circuit 1421 sends the hibernation wake-up signal to the controller 152 when the battery temperature is greater than or equal to the preset temperature threshold, the controller 152 enters the wake-up state, and then the controller 152 can send the alarm signal to the alarm 153 to remind the user that the temperature of the power battery module 141 is abnormal, so as to realize the full-period temperature monitoring of the power battery module 141 and improve the safety of the electric vehicle 100.

[0032] In the embodiment of the present application, the communication bus 151 can be a one-wire communication bus, and the one-wire communication bus only includes one signal line. Of course, the communication bus 151 can also be other types of buses, such as a CAN bus, an RS485 bus, etc. The controller 152 can be any one of a vehicle control unit (VCU), a body control module (BCM), a motor controller, etc. which is in communication connection with the battery manager 142 through the communication bus 151. The alarm 153 can be a buzzer, a voice announcer or a display, etc. When the alarm 153 is a buzzer or a voice announcer, the alarm 153 can issue an alarm voice according to the temperature alarm signal to remind the user that the temperature of the power battery module 141 is abnormal.

[0033] It can be understood that, in the embodiment of the present application, the communication bus 151 can be connected with other devices of the electric vehicle 100, such as an instrument, in addition to the battery manager 142 and the controller 152. Each device connected on the communication bus 151 is respectively arranged with an address, and when the device needs to transmit a signal through the communication bus 151, the address of the device can be included in the signal, so that the device receiving the signal can confirm which device the signal comes from.

[0034] Please refer to Figure 3In some embodiments, the temperature wake-up circuit 1421 comprises a temperature detection module 1421a and a control module 1421b, the temperature detection module 1421a is connected with the control module 1421b, and the control module 1421b is connected with the communication bus 151. The temperature detection module 1421a is configured to detect the battery temperature. The control module 1421b is configured to send a sleep wake-up signal to the controller 152 through the communication bus 151 when the battery temperature is greater than or equal to a preset temperature threshold.

[0035] Further, as shown in Figure 4 the control module 1421b comprises a control unit M1, a switch unit K1 and a pull-down resistor R1. The control unit M1 is connected with the temperature detection module 1421a and a control end of the switch unit K1. A first end of the switch unit K1 is connected to a low-voltage power supply end (not labeled in the figure). A second end of the switch unit K1 is connected to a first end of the pull-down resistor R1 and the communication bus 151. A second end of the pull-down resistor R1 is grounded. The control unit M1 is configured to send a switch control signal to the control end of the switch unit K1 when the battery temperature is greater than or equal to the preset temperature threshold. The switch unit K1 is configured to turn on or off according to the switch control signal to send the sleep wake-up signal to the communication bus 151.

[0036] In some embodiments, the control module 1421b can further comprise a pull-up resistor R2. The first end of the switch unit K1 is connected to the low-voltage power supply end through the pull-up resistor R2.

[0037] Specifically, when the switch unit K1 is turned on according to the switch control signal, the sleep wake-up signal is a high-level signal. When the switch unit K1 is turned off according to the switch control signal, the sleep wake-up signal is a low-level signal. The switch control signal can be a high-level signal or a low-level signal. The switch unit K1 can be an NPN transistor, an NMOS transistor, a PNP transistor or a PMOS transistor.

[0038] It can be understood that the battery voltage of the power battery module 141 is high voltage, which can usually reach 48V, 72V or even higher. Therefore, the low-voltage power supply end can be connected to a low-voltage battery module (not shown in the figure) in the electric vehicle 100, which is configured to supply power to the turn signal, the instrument panel and the like in the electric vehicle 100. It can be understood that when the low-voltage power supply end is connected to the low-voltage battery module, the low-voltage power supply end can be an IO pin of the battery manager 142.

[0039] In some other embodiments, the battery manager 142 can further include a step-down conversion circuit 1422, and the first end of the switch unit K1 is connected to the power battery module 141 through the step-down conversion circuit 1422. The step-down conversion circuit 1422 is used to provide the battery voltage of the power battery module 141 to the switch unit K1 through the low-voltage power supply end after step-down conversion, so as to prevent the switch unit K1 from being damaged by being directly connected to the power battery module 141. At this time, the low-voltage power supply end is the output end of the step-down conversion circuit 1422. It should be noted that the step-down conversion circuit 1422 can be integrated in the battery manager 142, or can be arranged outside the battery manager 142, and the embodiments of the present application do not limit this.

[0040] Specifically, in the embodiments, the battery manager 142 is provided with a first wake-up end P1, the controller 152 is provided with a second wake-up end P2, and the first wake-up end P1 and the second wake-up end P2 are respectively connected to the communication bus 151. The second end of the switch unit K1 is connected to the first wake-up end P1. The communication switch K2 and the communication resistor R3 can be arranged in the controller 152. The first end of the communication resistor R3 is connected to a power supply end VCC or a ground of the controller 152. The second end of the communication resistor R3 is connected to the first end of the communication switch K2. The second end of the communication switch K2 is connected to the second wake-up end P2. The power supply end VCC can be connected to the low-voltage power supply end, so as to be powered by the low-voltage battery module or the step-down conversion circuit 1422.

[0041] The battery manager 142 can enter the wake-up state from the sleep state when the first wake-up end P1 receives the wake-up signal transmitted by the communication bus 151. The wake-up signal can be sent to the communication bus 151 by the controller 152 or other devices. At this time, the controller 152 pulls up the second wake-up end P2 to a high level through the power supply end VCC or pulls down the second wake-up end P2 to a low level through the ground to generate a wake-up signal on the communication bus 151, and then the battery manager 142 enters the wake-up state according to the wake-up signal.

[0042] It can be understood that the controller 152 can be directly woken up by the power battery module 141 when the key of the electric vehicle 100 is powered on, and then the communication switch K2 is turned on. That is, the battery manager 142 can wake up the controller 152 through the communication bus 151, and the controller 152 can also wake up the battery manager 142 through the communication bus 151. Of course, other devices can also send a wake-up signal through the communication bus 151 to wake up the battery manager 142 and the controller 152.

[0043] The specific implementation of the control module 1421b of the embodiments of the present application is not limited to Figure 4 In some other embodiments, as Figure 5As shown, the control module 1421b includes a control unit M1, a switch unit K1, and a pull-up resistor R2. The control unit M1 is connected to the temperature detection module 1421a and the control end of the switch unit K1. The first end of the switch unit K1 is connected to the first end of the pull-up resistor R2 and the communication bus 151. The second end of the switch unit K1 is grounded. The second end of the pull-up resistor R2 is connected to the low-voltage power supply end 1422. The control unit M1 sends a switch control signal to the control end of the switch unit K1 when the battery temperature is greater than or equal to a preset temperature threshold. The switch unit K1 is used to turn on or off according to the switch control signal to send a sleep wake-up signal to the communication bus 151.

[0044] Specifically, when the switch unit K1 is turned on according to the switch control signal, the sleep wake-up signal is a low-level signal. When the switch unit K1 is turned off according to the switch control signal, the sleep wake-up signal is a high-level signal. With Figure 4 Similarly, the switch control signal can be a high-level signal or a low-level signal. The switch unit K1 can be an NPN transistor, an NMOS transistor, a PNP transistor, or a PMOS transistor. The second end of the pull-up resistor R2 can be connected to the power battery module 141 through the step-down conversion circuit 1422.

[0045] In the embodiments of the present application, the control unit M1 can be a control chip in the battery manager 142, such as a microcontroller unit (MCU) M1 in the battery manager 142. The microcontroller unit M1 is the core computing and control unit of the battery manager 142, responsible for data processing, battery state monitoring, control algorithm execution, fault diagnosis, communication management, and other functions.

[0046] In some embodiments, as Figure 6 As shown, the temperature detection module 1421a includes a temperature sensor T1 connected to the control unit M1. The temperature sensor T1 is used to detect the battery temperature and output a wake-up signal to the control unit M1 when the battery temperature is greater than or equal to a preset temperature threshold. The control unit M1 enters the wake-up state from the sleep state according to the wake-up signal and sends a switch control signal to the control end of the switch unit K1.

[0047] Therefore, the temperature sensor T1 can continuously detect the battery temperature of the power battery module 141, but when the detected battery temperature is greater than or equal to the preset temperature threshold, the temperature sensor T1 outputs a wake-up signal to the control unit M1 to make the control unit M1 enter the wake-up state from the sleep state. In this way, when the control unit M1 of the battery manager 142 is also in the sleep state, the temperature of the power battery module 141 can still be monitored. When the battery temperature exceeds the preset temperature threshold, the control unit M1 is woken up by the temperature sensor T1, and then the control unit M1 sends a switch control signal to the control end of the switch unit K1 to make the controller 152 output an alarm signal to the alarm 153.

[0048] Specifically, the temperature sensor T1 can include a thermistor (not shown in the figure). When the battery temperature changes, the resistance of the thermistor will change, and then the voltage of the thermistor will also change. Therefore, the voltage corresponding to the thermistor when the battery temperature is greater than the preset temperature threshold can be used as the wake-up signal.

[0049] It can be understood that the electric vehicle 100 needs to be charged, so the electrical system 15 further includes a charging interface 155. The charging interface 155 is used to connect a charger, and then the charger charges the power battery module 141.

[0050] The charging interface 155 can include a communication terminal connected to the communication bus 151. When the charging interface 155 is connected to the charger, the charging interface 155 receives a charging wake-up signal sent by the charger through the communication terminal, and the battery manager 142 enters the wake-up state from the sleep state according to the charging wake-up signal.

[0051] Therefore, when the charger is connected to the charging interface 155, the charging wake-up signal can be sent to the battery manager 142 through the communication terminal to wake up the battery manager 142, and then the power battery module 141 can be charged.

[0052] In the embodiment of the application, when the temperature sensor T1 detects that the battery temperature is greater than or equal to the preset temperature threshold, the temperature sensor T1 outputs a wake-up signal to the control unit M1, so that the control unit M1 enters the wake-up state from the sleep state, and then the control unit M1 after wake-up sends a switch control signal to the switch unit K1, so that the switch unit K1 is turned on, the first wake-up end P1 of the battery manager 142 is pulled high to the high level, that is, the first wake-up end P1 generates a wake-up signal to the communication bus 151. The second wake-up end P2 of the controller 152 receives the sleep wake-up signal transmitted by the communication bus 151, enters the wake-up state from the sleep state according to the sleep wake-up signal, and sends a temperature alarm signal to the alarm 153, and then the alarm 153 issues an alarm according to the temperature alarm signal, so as to remind the user that the temperature of the power battery module 141 is abnormal, and then the user can handle in time, and the safety of the power battery module 141 and the whole vehicle is provided. In this way, when the control unit M1 and the controller 152 of the battery manager 142 are in the sleep state, the temperature of the power battery module 141 can also be detected in real time, and when an abnormality occurs, the control unit M1 and the controller 152 can also be woken up in time, and the alarm 153 can alarm the temperature abnormality, so as to realize the whole period temperature monitoring of the power battery module 141, and improve the safety of the electric vehicle 100.

[0053] The above embodiments are described as preferred embodiments of the application, and do not limit the scope of the application. Without departing from the design spirit of the application, various modifications and improvements of the technical solutions of the application made by those skilled in the art shall fall within the protection scope determined by the claims of the application.

Claims

1. An electric vehicle, comprising: a vehicle frame; a vehicle body covering at least partially covering the vehicle frame; a walking system arranged below the vehicle frame; a power system comprising a power battery module, a battery manager and a driving assembly, the power battery module being connected with the battery manager, the driving assembly being supported by the vehicle frame and connected with the power battery module; the battery manager being configured to control the power output of the power battery module to the driving assembly, so that the driving assembly provides driving force for the walking system; an electrical system comprising a communication bus, a controller and an alarm, the battery manager and the controller being communicatively connected through the communication bus, the controller being connected with the alarm; characterized in that the battery manager comprises a temperature wake-up circuit, the temperature wake-up circuit being communicatively connected with the controller through the communication bus; the temperature wake-up circuit being configured to detect a battery temperature of the power battery module, and send a hibernation wake-up signal to the controller through the communication bus when the battery temperature is greater than or equal to a preset temperature threshold; the controller enters a wake-up state from a hibernation state according to the hibernation wake-up signal, and sends a temperature alarm signal to the alarm; the alarm sends an alarm according to the temperature alarm signal.

2. The electric vehicle of claim 1, wherein, the temperature wake-up circuit comprises a temperature detection module and a control module, the temperature detection module being connected with the control module, and the control module being connected with the communication bus; the temperature detection module is configured to detect the battery temperature; the control module is configured to send the hibernation wake-up signal to the controller through the communication bus when the battery temperature is greater than or equal to the preset temperature threshold.

3. The electric vehicle of claim 2, wherein, the control module comprises a control unit, a switch unit and a pull-down resistor, the control unit being connected with the temperature detection module and the control end of the switch unit respectively, the first end of the switch unit being connected to a low-voltage power supply end, the second end of the switch unit being connected with the first end of the pull-down resistor and the communication bus, and the second end of the pull-down resistor being grounded; the control unit is configured to send a switch control signal to the control end of the switch unit when the battery temperature is greater than or equal to the preset temperature threshold; the switch unit is configured to be turned on according to the switch control signal to send the hibernation wake-up signal to the communication bus.

4. The electric vehicle of claim 3, wherein, the control module further comprises a pull-up resistor, and the first end of the switch unit is connected with the low-voltage power supply end through the pull-up resistor.

5. The electric vehicle as claimed in claim 3 or 4, characterized in that the battery manager further comprises a step-down conversion circuit, the step-down conversion circuit being configured to provide the battery voltage of the power battery module to the switch unit through the low-voltage power supply end after step-down conversion.

6. The electric vehicle of claim 2, wherein, The control module comprises a control unit, a switch unit and a pull-up resistor, the control unit is connected to the control end of the switch unit and the temperature detection module, the first end of the switch unit is connected to the first end of the pull-up resistor and the communication bus, the second end of the switch unit is grounded, and the second end of the pull-up resistor is connected to a low-voltage power supply end; the control unit sends a switch control signal to the control end of the switch unit when the battery temperature is greater than or equal to the preset temperature threshold; and the switch unit is turned on according to the switch control signal to send the sleep wake-up signal to the communication bus.

7. The electric vehicle as claimed in claim 3 or 6, wherein, The temperature detection module comprises a temperature sensor connected to the control unit; the temperature sensor is used to detect the battery temperature and output a wake-up signal to the control unit when the battery temperature is greater than or equal to the preset temperature threshold; and the control unit enters the wake-up state from the sleep state according to the wake-up signal and sends the switch control signal to the control end of the switch unit.

8. The electric vehicle of claim 1, wherein, The electrical system further comprises a charging interface for connecting a charger; the charging interface comprises a communication terminal connected to the communication bus, the charging interface receives a charging wake-up signal sent by the charger through the communication terminal when the charging interface is connected to the charger, and the battery manager enters the wake-up state from the sleep state according to the charging wake-up signal.

9. The electric vehicle of claim 1, wherein, The communication bus is a one-wire communication bus.

10. The electric vehicle of claim 1, wherein, The controller is any one of a vehicle control unit, a vehicle body control unit and a motor control unit.

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