Electric vehicle battery control circuit and method

Abstract

The invention discloses an electric vehicle battery control circuit and method. The first end of an air switch of the control circuit is electrically connected with the output end of a battery, and the second end of the air switch is electrically connected with the input end of a sampling module and the first end of a driving switch tube; the second end of the driving switch tube is electrically connected with the system power supply end; the output end of the sampling module is electrically connected with the voltage sampling end of the controller, and the sampling module is used for outputting sampling voltage to the controller; the first end of the first starting switch tube is electrically connected with the control end of the driving switch tube, and the second end is connected with the ground end and used for controlling the driving switch tube to be switched on or switched off; the enabling end of the controller is electrically connected with the control end of the first starting switch tube and is used for controlling the first starting switch tube to be switched on or switched off; the controller is used for controlling the first starting switch tube to be switched on when the sampling voltage is larger than a first voltage threshold value and controlling the first starting switch tube to be switched off when the sampling voltage is smaller than a second voltage threshold value. According to the technical scheme provided by the invention, the cruising ability of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery control, and in particular to a battery control circuit and method for an electric vehicle. Background Art

[0002] With the development of two-wheeled vehicle technology and the increasing requirements for the battery life performance and service life of two-wheeled electric vehicles, it is required to disconnect the battery for discharge in low voltage or under voltage state.

[0003] At present, the batteries of most cars still have a certain amount of static power consumption when the vehicle is not used for a long time. The whole vehicle system still has a certain amount of static power consumption when it is stationary, causing the battery to continue to discharge in an undervoltage state. If it is not charged in time, it may cause the battery's later endurance or the battery itself to be permanently damaged, thus reducing the battery life and causing economic losses to users in severe cases. Summary of the Invention

[0004] The embodiments of the present invention provide a battery control circuit and method for an electric vehicle, which meet the customer's demand for battery endurance performance and extended battery service life.

[0005] In a first aspect, an embodiment of the present invention provides an electric vehicle battery control circuit, comprising: an air switch, a first starting switch tube, a sampling module, a driving switch tube, and a controller;

[0006] The first end of the air switch is electrically connected to the battery output end; the second end of the air switch is electrically connected to the input end of the sampling module and the first end of the driving switch tube respectively; the second end of the driving switch tube is electrically connected to the system power supply end, for transmitting the battery voltage to the system power supply end; the output end of the sampling module is electrically connected to the voltage sampling end of the controller, for outputting the sampled voltage to the controller; the first end of the first starting switch tube is electrically connected to the control end of the driving switch tube, and the second end of the first starting switch tube is connected to the ground end, for controlling the driving switch tube to be turned on or off; the enable end of the controller is electrically connected to the control end of the first starting switch tube, for controlling the first starting switch tube to be turned on or off;

[0007] The controller is used to control the first startup switch tube to be turned on when the sampling voltage is greater than a first voltage threshold; the controller is also used to control the first startup switch tube to be turned off when the sampling voltage is less than a second voltage threshold.

[0008] In a second aspect, an embodiment of the present invention provides an electric vehicle battery control method, applicable to the electric vehicle battery control circuit provided by any embodiment of the present invention, wherein the electric vehicle battery control circuit further includes: a second starting module; the second starting module includes a trigger unit and a second starting switch tube; the second end of the air switch is electrically connected to the control end of the second starting switch tube through the trigger unit; the first end of the second starting switch tube is electrically connected to the first end of the first starting switch tube; and the second end of the second starting switch tube is electrically connected to the ground terminal;

[0009] The electric vehicle battery control method includes:

[0010] When the air switch is instantaneously closed, the second starting module is turned on to turn on the driving switch tube, so that the driving switch tube outputs the battery voltage to the system power supply end;

[0011] After the air switch is turned off and then continuously closed, the controller detects that the sampled voltage is greater than the first voltage threshold, and then controls the first starting switch tube to be turned on so that the driving switch tube is continuously turned on; the second starting switch tube is turned off;

[0012] The controller is further configured to control the first startup switch to be turned off when the sampling voltage is less than a second voltage threshold.

[0013] In the present invention, the electric vehicle battery control circuit includes an air switch, a first starting switch tube, a sampling module, a drive switch tube, and a controller. The air switch connects the battery output terminal to the first end of the drive switch tube, while the second end of the drive switch tube is electrically connected to the system power supply terminal. A sampling module is provided between the air switch and the first end of the drive switch tube, and the first starting switch tube is electrically connected to the control end of the drive switch tube. After the controller controls the air switch to close, the sampling module collects a sampled voltage at the first end of the drive switch tube and outputs it to the controller. When the controller detects that the sampled voltage is greater than a first voltage threshold, it controls the first starting switch tube to conduct, thereby turning on the drive switch tube and allowing the battery to continuously supply power to the system power supply terminal. When the controller detects that the sampled voltage is less than a second voltage threshold, it controls the first starting switch tube to turn off. In the event of low or undervoltage conditions, the battery's power supply to the system power supply terminal is disconnected, thereby improving the battery's endurance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic structural diagram of an electric vehicle battery control circuit provided by an embodiment of the present invention;

[0015] Figure 2 A flow chart of a method for controlling a battery in an electric vehicle provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0017] An embodiment of the present invention provides an electric vehicle battery control circuit. Figure 1 This is a structural diagram of an electric vehicle battery control circuit provided by an embodiment of the present invention. The electric vehicle battery control circuit includes: an air switch DZ1, a first starting switch tube Q3, a sampling module 11, a driving switch tube Q1 and a controller 12;

[0018] A first end of the air switch DZ1 is electrically connected to the battery output terminal VBAT; a second end of the air switch DZ1 is electrically connected to the input end of the sampling module 11 and the first end of the driving switch tube Q1 respectively; a second end of the driving switch tube Q1 is electrically connected to the system power supply terminal VCC-OUT, for transmitting the battery voltage to the system power supply terminal VCC-OUT; an output end of the sampling module 11 is electrically connected to the voltage sampling terminal MCU-ADC of the controller 12, for outputting the sampled voltage to the controller 12; a first end of the first starting switch tube Q3 is electrically connected to the control end of the driving switch tube Q1, and a second end of the first starting switch tube Q3 is connected to the ground terminal GND, for controlling whether the driving switch tube Q1 is turned on or off; an enable terminal MCU-EN of the controller 12 is electrically connected to the control end of the first starting switch tube Q3, for controlling whether the first starting switch tube Q3 is turned on or off;

[0019] The controller 12 is used to control the first startup switch tube Q3 to turn on when the sampling voltage is greater than the first voltage threshold; the controller 12 is also used to control the first startup switch tube Q3 to turn off when the sampling voltage is less than the second voltage threshold.

[0020] Air switch DZ1, also known as an air circuit breaker, is a switch that automatically disconnects if the current in the circuit exceeds the rated current. Controller 12 is electrically connected to air switch DZ1 and can control its conduction and disconnection. The first terminal of air switch DZ1 is electrically connected to the battery output terminal VBAT, and the second terminal of air switch DZ1 is electrically connected to the first terminal of driver switch Q1. The second terminal of driver switch Q1 is electrically connected to the system power supply terminal VCC-OUT. The battery output terminal VBAT is then transmitted through air switch DZ1 and driver switch Q1 to the system power supply terminal VCC-OUT, facilitating subsequent supply to electronic devices such as motors.

[0021] The electric vehicle battery control circuit also includes a sampling module 11. Sampling module 11 is positioned between the second terminal of air switch DZ1 and the first terminal of driver switch Q1. It collects the power supply voltage from the battery output terminal VBAT and outputs a sampled voltage identifying the power supply voltage to the voltage sampling terminal MCU-ADC of controller 12. When the sampled voltage exceeds a first voltage threshold, controller 12 activates first startup switch Q3 via its enable terminal MCU-EN. The control terminal of first startup switch Q3 is electrically connected to the enable terminal MCU-EN of controller 12. The first terminal of first startup switch Q3 is electrically connected to the control terminal of driver switch Q1, and the second terminal of first startup switch Q3 is connected to ground GND. When controller 12 controls first startup switch Q3 to conduct via enable terminal MCU-EN, driver switch Q1 is turned on, and first startup switch Q3 controls driver switch Q1 to remain on to supply power to system power terminal VCC-OUT.

[0022] Thereafter, sampling module 11 continuously transmits the sampled voltage to controller 12. Controller 12 is further configured to control the first startup switch Q3 to shut down, thereby shutting down the drive switch Q1, when the sampled voltage falls below a second voltage threshold, via enable terminal MCU-EN. This prevents the battery from discharging even in low or undervoltage conditions. Controller 12 promptly shuts down drive switch Q1 when the sampled voltage is too low, preventing the battery from overshooting and potentially damaging the battery's battery life or the battery itself, thereby extending battery life and minimizing user losses.

[0023] It should be noted that when the sampled voltage is greater than the first voltage threshold, the power voltage outputted from the air switch DZ1 to the first terminal of the driver switch Q1 can meet the power supply requirements of the system power supply terminal VCC-OUT. The controller 12 controls the driver switch Q1 to conduct via the first startup switch Q3 when the power voltage obtained is sufficient to meet the power supply requirements of the power supply terminal VCC-OUT. When the sampled voltage is less than the first voltage threshold, it indicates that the power voltage outputted from the air switch DZ1 to the first terminal of the driver switch Q1 is too low or that the battery is undervoltage. To protect the battery, the controller 12 controls the driver switch Q1 to shut down via the first startup switch Q3, avoiding disconnection of the system power supply and ensuring battery life and service life.

[0024] Optionally, the first voltage threshold may be greater than the second voltage threshold. The first voltage threshold serves as a turn-on signal for driving the switch Q1, while the second voltage threshold serves as a turn-off signal for driving the switch Q1. Therefore, the first voltage threshold needs to be greater than the second voltage threshold. To further improve the reliability of the electric vehicle battery control circuit, the difference between the first and second voltage thresholds can be set to be significant for easy distinction, thereby facilitating the controller 12 to control the first startup switch Q3 to turn on or off based on the first and second voltage thresholds.

[0025] In an embodiment of the present invention, an electric vehicle battery control circuit includes an air switch, a first starting switch, a sampling module, a drive switch, and a controller. The air switch connects the battery output terminal to the first end of the drive switch, while the second end of the drive switch is electrically connected to the system power supply. A sampling module is provided between the air switch and the first end of the drive switch, and the first starting switch is electrically connected to the control end of the drive switch. After the controller closes the air switch, the sampling module collects a sampled voltage at the first end of the drive switch and outputs it to the controller. When the controller detects that the sampled voltage is greater than a first voltage threshold, it controls the first starting switch to conduct, turning on the drive switch, and allowing the battery to continue supplying power to the system power supply. When the controller detects that the sampled voltage is less than a second voltage threshold, it controls the first starting switch to shut off. This disconnects the battery from supplying power to the system power supply when the battery voltage is low or undervoltage, thereby improving the battery's endurance and service life.

[0026] The above is the core concept of the present invention. The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] Continue to refer Figure 1 Optionally, the electric vehicle battery control circuit may further include: a second starting module 13; the second starting module 13 includes a trigger unit 131 and a second starting switch tube Q2; the second end of the air switch DZ1 is electrically connected to the control end of the second starting switch tube Q2 through the trigger unit 131; the first end of the second starting switch tube Q2 is electrically connected to the first end of the first starting switch tube Q3; the second end of the second starting switch tube Q2 is electrically connected to the ground end GND; the first starting switch tube Q3 and the second starting module 13 are not turned on at the same time.

[0028] The second startup module 13 includes a second startup switch Q2 and a trigger unit 131 that drives the second startup switch Q2. The trigger unit 131 is electrically connected to the second end of the air switch DZ1 and is configured to turn on the second startup switch Q2 at the instant the air switch DZ1 closes, thereby enabling the drive switch Q1 to quickly supply power to the system power supply terminal VCC-OUT. When the controller 12 detects that the sampled voltage is greater than a first voltage threshold, it controls the first startup switch Q3 to turn on. Simultaneously, the second startup switch Q2 is turned off, and the first startup switch Q3 continues to control the drive switch Q1 to turn on. In this embodiment, the first startup switch Q3 and the second startup module 13 achieve internal self-locking through the RC circuit characteristics, and the first startup switch Q3 and the second startup switch Q2 do not need to be turned on simultaneously.

[0029] In this embodiment, after the driving switch Q1 is turned off in the battery undervoltage state, if the system needs to be powered on again, the controller 12 controls the air switch DZ1 to open from the closed state and then close it again to re-trigger the self-locking circuit of this embodiment. Figure 1 , the controller 12 can also be used to control the air switch DZ1 to switch from a closed state to an open state, and then from an open state to a closed state when the system power supply terminal VCC-OUT is powered on. The electric vehicle battery control circuit will not automatically control the drive switch tube Q1 to turn on directly when the battery output terminal VBAT voltage recovers (through charging). Instead, when the controller 12 receives the power-on request of the system power supply terminal VCC-OUT given by the electric vehicle, it controls the air switch DZ1 to switch from a closed state to an open state, and then from an open state to a closed state, thereby controlling the drive switch tube Q1 to be turned on or off again according to the sampling voltage of the sampling module 11. In this embodiment, the drive switch tube Q1 will not be automatically turned on after the battery output terminal VBAT voltage recovers, which can prevent the user from leaving the vehicle stationary for a long time, thereby preventing the entire vehicle system from having static power consumption when it is stationary, preventing the battery from being undervoltage due to long-term stationary conditions, and avoiding damage to the battery body. In this embodiment, when the system power supply terminal VCC-OUT is powered on, the air switch DZ1 is controlled to be reclosed, and the second starting switch tube Q2 is used to instantaneously start the drive switch tube Q1 to be turned on. After that, the air switch DZ1 is disconnected and then closed again, and the first starting switch tube Q3 is used to continuously control the drive switch tube Q1 to be turned on, thereby further enhancing the reliability of the electric vehicle battery control circuit and improving the battery life and endurance.

[0030] Continue to refer Figure 1 Optionally, the sampling module 11 may include: a first resistor R1, a second resistor R2, and a first capacitor C1; the first end of the first resistor R1 is electrically connected to the second end of the air switch DZ1; the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2 and the voltage sampling terminal MCU-ADC of the controller 12 respectively; the second end of the second resistor R2 is electrically connected to the ground terminal GND; the first capacitor C1 is connected in parallel with the second resistor R2. The first resistor R1, the second resistor R2, and the first capacitor C1 form a filter sampling circuit, and the first resistor R1 and the second resistor R2 form a divided voltage, thereby forming a sampled voltage output to the controller. In addition, the first capacitor C1 is connected in parallel with the second resistor R2 to further stabilize the sampled voltage and increase the accuracy of the sampled voltage, so that the controller 12 can obtain the power supply voltage value of the battery according to the sampled voltage, thereby improving the control accuracy of the controller 12 and increasing the reliability of the electric vehicle battery control circuit.

[0031] Continue to refer Figure 1Optionally, the electric vehicle battery control circuit may further include: a voltage protection module 15; the voltage protection module 15 includes a third resistor R3, a voltage regulator DZ2, and a second capacitor C2; the negative electrode of the voltage regulator DZ2 is electrically connected to the first terminal of the driver switch Q1; the positive electrode of the voltage regulator DZ2 is electrically connected to the control terminal of the driver switch Q1; the third resistor R3 and the second capacitor C2 are both connected in parallel with the voltage regulator DZ2. The third resistor R3, the voltage regulator DZ2, and the second capacitor C2 protect the voltage difference between the control terminal and the first terminal of the driver switch Q1, preventing the voltage difference from being too large and damaging the driver switch Q1. The third resistor R3 acts as a voltage divider and current limiter, and the voltage regulator DZ2 acts as a voltage stabilizer. This embodiment further improves the reliability of the electric vehicle battery control circuit.

[0032] Continue to refer Figure 1 Optionally, the trigger unit 131 may include: a fifth resistor R5, a first electrolytic capacitor C3, a first diode D1, a second electrolytic capacitor C4, a sixth resistor R6 and a seventh resistor R7; the first end of the fifth resistor R5 is electrically connected to the second end of the air switch DZ1; the second end of the fifth resistor R5 is connected to the ground terminal GND; the positive electrode of the first electrolytic capacitor C3 is electrically connected to the first end of the fifth resistor R5; the negative electrode of the first electrolytic capacitor C3 is electrically connected to the negative electrode of the first diode D1; the positive electrode of the first diode D1 is connected to the ground terminal GND; the positive electrode of the second electrolytic capacitor C4 is electrically connected to the negative electrode of the first diode D1; the negative electrode of the second electrolytic capacitor C4 is connected to the ground terminal GND; the first end of the sixth resistor R6 is electrically connected to the positive electrode of the second electrolytic capacitor C4; the second end of the sixth resistor R6 is electrically connected to the control end of the second starting switch tube Q2; the control end of the second starting switch tube Q2 is connected to the ground terminal GND through the seventh resistor R7. The fifth resistor R5, the first electrolytic capacitor C3, the first diode D1, the second electrolytic capacitor C4, the sixth resistor R6, and the seventh resistor R7 form an instantaneous start structure to instantaneously turn on the second start switch Q2. When the system power supply terminal is powered on, the controller 12 controls the air switch DZ1 to switch from a closed state to an open state. The trigger unit 131 instantaneously turns on the second start switch Q2 to instantaneously power the system power supply terminal VCC-OUT. The controller 12 then controls the air switch DZ1 to switch from an open state to a closed state. The controller 12 then continuously turns on the drive switch Q1 via the first start switch Q3.

[0033] Optionally, the first terminal of the first starting switch Q3 can be electrically connected to the control terminal of the driving switch Q1 via an eighth resistor R8. The eighth resistor R8 serves as a voltage divider. This embodiment achieves internal self-locking through the characteristics of an RC circuit, eliminating the need for both starting switches to be on simultaneously. Furthermore, the electric vehicle battery control circuit monitors the battery voltage in real time and can disconnect the circuit. If the battery voltage recovers and fails to recover automatically, the air switch DZ1 must be re-activated to re-trigger the self-locking circuit. This embodiment effectively protects the battery from undervoltage, thereby improving battery life.

[0034] Based on the same concept, an embodiment of the present invention also provides an electric vehicle battery control method, which is applicable to the electric vehicle battery control circuit provided by any embodiment of the present invention. The electric vehicle battery control circuit may also include: a second starting module; the second starting module includes a trigger unit and a second starting switch tube; the second end of the air switch is electrically connected to the control end of the second starting switch tube through the trigger unit; the first end of the second starting switch tube is electrically connected to the first end of the first starting switch tube; and the second end of the second starting switch tube is electrically connected to the ground end. Figure 2 A flow chart of a method for controlling an electric vehicle battery according to an embodiment of the present invention is shown in FIG. Figure 2 As shown, the method of this embodiment includes the following steps:

[0035] Step S110: When the air switch is instantaneously closed, the second starting module is turned on to turn on the driving switch tube, so that the driving switch tube outputs the battery voltage to the system power supply terminal.

[0036] Step S120: After the air switch is turned off and then continuously closed, the controller detects that the sampling voltage is greater than the first voltage threshold, and then controls the first starting switch tube to be turned on so that the driving switch tube is continuously turned on; and the second starting switch tube is turned off.

[0037] Step S130: The controller is further configured to control the first startup switch to turn off when the sampled voltage is less than the second voltage threshold.

[0038] In an embodiment of the present invention, an electric vehicle battery control circuit includes an air switch, a first starting switch, a sampling module, a drive switch, and a controller. The air switch connects the battery output terminal to the first end of the drive switch, while the second end of the drive switch is electrically connected to the system power supply. A sampling module is provided between the air switch and the first end of the drive switch, and the first starting switch is electrically connected to the control end of the drive switch. After the controller closes the air switch, the sampling module collects a sampled voltage at the first end of the drive switch and outputs it to the controller. When the controller detects that the sampled voltage is greater than a first voltage threshold, it controls the first starting switch to conduct, turning on the drive switch, and allowing the battery to continue supplying power to the system power supply. When the controller detects that the sampled voltage is less than a second voltage threshold, it controls the first starting switch to shut off. This disconnects the battery from supplying power to the system power supply when the battery voltage is low or undervoltage, thereby improving the battery's endurance and service life.

[0039] Based on the above embodiment, the electric vehicle battery control method may further include a controller for controlling the air switch to switch from a closed state to an open state and then from an open state to a closed state when the system power supply is powered on. This embodiment cannot automatically restore power after the battery voltage recovers, but requires the air switch to be closed and opened again to re-trigger the self-locking circuit. This embodiment effectively protects the battery from undervoltage and improves battery life.

[0040] The electric vehicle battery control method in this embodiment includes the technical features of the electric vehicle battery control circuit provided by any embodiment of the present invention, and has the beneficial effects of the corresponding technical features, which will not be repeated here.

[0041] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An electric vehicle battery control circuit, characterized in that: include: Air switch, first starting switch tube, sampling module, drive switch tube and controller; The first end of the air switch is electrically connected to the battery output end; the second end of the air switch is electrically connected to the input end of the sampling module and the first end of the driving switch tube respectively; the second end of the driving switch tube is electrically connected to the system power supply end, for transmitting the battery voltage to the system power supply end; the output end of the sampling module is electrically connected to the voltage sampling end of the controller, for outputting the sampled voltage to the controller; the first end of the first starting switch tube is electrically connected to the control end of the driving switch tube, and the second end of the first starting switch tube is connected to the ground end, for controlling the driving switch tube to be turned on or off; the enable end of the controller is electrically connected to the control end of the first starting switch tube, for controlling the first starting switch tube to be turned on or off; The controller is used to control the first startup switch tube to be turned on when the sampling voltage is greater than a first voltage threshold; the controller is also used to control the first startup switch tube to be turned off when the sampling voltage is less than a second voltage threshold.

2. The electric vehicle battery control circuit according to claim 1, characterized in that: Also includes: The second starting module includes a trigger unit and a second starting switch tube; The second end of the air switch is electrically connected to the control end of the second starting switch tube through the trigger unit; the first end of the second starting switch tube is electrically connected to the first end of the first starting switch tube; and the second end of the second starting switch tube is electrically connected to the ground end. The first startup switch tube and the second startup module are not turned on at the same time.

3. The electric vehicle battery control circuit according to claim 2, characterized in that: The controller is further configured to control the air switch to switch from a closed state to an open state, and then switch from the open state to a closed state when the system power supply end is powered on.

4. The electric vehicle battery control circuit according to claim 1, characterized in that: The sampling module includes: a first resistor, a second resistor and a first capacitor; The first end of the first resistor is electrically connected to the second end of the air switch; the second end of the first resistor is electrically connected to the first end of the second resistor and the voltage sampling end of the controller respectively; the second end of the second resistor is electrically connected to the ground end; the first capacitor is connected in parallel with the second resistor.

5. The electric vehicle battery control circuit according to claim 1, characterized in that: Also includes: Pole voltage protection module; The polar voltage protection module includes a third resistor, a voltage regulator tube and a second capacitor; The negative electrode of the voltage regulator tube is electrically connected to the first end of the driving switch tube; the positive electrode of the voltage regulator tube is electrically connected to the control end of the driving switch tube; the third resistor and the second capacitor are both connected in parallel with the voltage regulator tube.

6. The electric vehicle battery control circuit according to claim 2, characterized in that: The trigger unit includes: a fifth resistor, a first electrolytic capacitor, a first diode, a second electrolytic capacitor, a sixth resistor and a seventh resistor; The first end of the fifth resistor is electrically connected to the second end of the air switch; the second end of the fifth resistor is connected to the ground; the positive electrode of the first electrolytic capacitor is electrically connected to the first end of the fifth resistor; the negative electrode of the first electrolytic capacitor is electrically connected to the negative electrode of the first diode; the positive electrode of the first diode is connected to the ground; the positive electrode of the second electrolytic capacitor is electrically connected to the negative electrode of the first diode; and the negative electrode of the second electrolytic capacitor is connected to the ground. The first end of the sixth resistor is electrically connected to the positive electrode of the second electrolytic capacitor; the second end of the sixth resistor is electrically connected to the control end of the second startup switch tube; the control end of the second startup switch tube is connected to the ground end through the seventh resistor.

7. The electric vehicle battery control circuit according to claim 1, characterized in that: The first end of the first starting switch tube is electrically connected to the control end of the driving switch tube through an eighth resistor.

8. The electric vehicle battery control circuit according to claim 1, characterized in that: The first voltage threshold is greater than the second voltage threshold.

9. A method for controlling an electric vehicle battery, characterized in that: The electric vehicle battery control circuit is applicable to any one of claims 1 to 8, wherein the electric vehicle battery control circuit further comprises: a second starting module; the second starting module comprises a trigger unit and a second starting switch tube; the second end of the air switch is electrically connected to the control end of the second starting switch tube via the trigger unit; the first end of the second starting switch tube is electrically connected to the first end of the first starting switch tube; and the second end of the second starting switch tube is electrically connected to the ground end; The electric vehicle battery control method includes: When the air switch is instantaneously closed, the second starting module is turned on to turn on the driving switch tube, so that the driving switch tube outputs the battery voltage to the system power supply end; After the air switch is turned off and then continuously closed, the controller detects that the sampled voltage is greater than the first voltage threshold, and then controls the first starting switch tube to be turned on so that the driving switch tube is continuously turned on; the second starting switch tube is turned off; The controller is further configured to control the first startup switch to be turned off when the sampling voltage is less than a second voltage threshold.

10. The electric vehicle battery control method according to claim 9, characterized in that: Also includes: The controller is further configured to control the air switch to switch from a closed state to an open state, and then switch from the open state to a closed state when the system power supply end is powered on.

Images