A control method for replenishing the battery of an electric vehicle

Abstract

This invention discloses a control method for replenishing the battery of an electric vehicle. By adding a battery undervoltage wake-up circuit to the DC-DC converter connected in parallel with the battery, when the battery voltage is too low, the undervoltage wake-up circuit generates a wake-up signal to wake up the VCU, BMS, DC-DC converter, and T-BOX, thereby replenishing the battery. Through this method, this invention can replenish the battery of an electric vehicle in a timely and effective manner, with low cost, low power consumption, and good controllability.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle battery technology, and in particular to a control method for replenishing electric vehicle batteries. Background Technology

[0002] Car batteries often become depleted, preventing the vehicle from starting and causing considerable inconvenience. In such cases, the depleted battery needs to be recharged to restart the car. Currently, all controllers in electric vehicles are powered by the battery. A depleted battery will prevent the vehicle from starting. For traditional gasoline-powered vehicles, methods for recharging the battery include:

[0003] 1. Recharge the battery using a dedicated charger;

[0004] 2. Jump-start the car by connecting it to the battery of another vehicle to replenish its power;

[0005] 3. Recharge the battery after starting the vehicle using the starter kit.

[0006] Currently, because new energy vehicles have DC-DC converters, the methods for charging electric vehicles are more diverse:

[0007] a) By adding IBS, the battery status can be monitored in real time;

[0008] b) Recharge the battery by detecting the battery voltage through timed wake-up via T-BOX, VCU or BMS;

[0009] c) The battery voltage is collected for power replenishment, and the relay device is controlled to switch the power replenishment.

[0010] Of the above solutions, solution a adds a component, which increases the overall vehicle weight and cost, making it the least economical; solution b adds unnecessary wake-up cycles to detect battery voltage, increasing power consumption; and solution c has higher control costs.

[0011] Therefore, there is an urgent need to provide a new control method for replenishing the battery of electric vehicles to solve the above problems. Summary of the Invention

[0012] The technical problem to be solved by the present invention is to provide a control method for replenishing the battery of an electric vehicle, which can replenish the battery of an electric vehicle in a timely and effective manner.

[0013] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is to provide a control method for replenishing the battery of an electric vehicle. By adding a battery undervoltage wake-up circuit to the DC-DC device connected in parallel with the battery, when the battery voltage is too low, the battery undervoltage wake-up circuit generates a wake-up signal to wake up the VCU, BMS, DC-DC, and T-BOX, thereby realizing the replenishment of the battery.

[0014] In a preferred embodiment of the present invention, the battery undervoltage wake-up circuit includes a Zener diode Z1, resistors R1-R3, and an N-channel MOSFET Q1. The Zener diode Z1 is connected in parallel between the battery voltages KL30 and KL15. The resistor R1 is connected in parallel between the battery voltage KL15 and the gate of the N-channel MOSFET. One end of the resistor R2 is connected to the gate of the N-channel MOSFET, and the other end is grounded. The resistor R3 is connected in parallel between the battery voltage KL30 and the drain of the N-channel MOSFET. The drain of the N-channel MOSFET is the output terminal.

[0015] In a preferred embodiment of the present invention, when the vehicle is in the ignition state, a stable gate voltage is provided to the N-channel MOS transistor Q1, and the wake-up signal is low at this time.

[0016] When the vehicle is off, if the battery voltage KL30 is higher than the threshold, the N-channel MOSFET Q1 will turn on and the wake-up signal will be low.

[0017] When the vehicle is off, if the battery voltage KL30 is higher than the threshold, the N-channel MOSFET Q1 will turn off, the wake-up signal will be pulled up to KL30, and the DC-DC device will be woken up.

[0018] Furthermore, the DC-DC device uses a network or hardwired connection to wake up the VCU, BMS, and T-BOX.

[0019] The beneficial effects of this invention are: by adding a battery undervoltage wake-up circuit to the existing equipment of electric vehicles, the battery undervoltage wake-up circuit can generate a wake-up signal to wake up the VCU, BMS, DC-DC, and T-BOX when the battery voltage is too low, thereby realizing the replenishment of the battery. It has low cost, low power consumption, and good controllability.

[0020] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a block diagram illustrating the principle of a control method for replenishing power to an electric vehicle battery according to the present invention.

[0023] Figure 2This is a schematic diagram of the battery undervoltage wake-up circuit. Detailed Implementation

[0024] To further illustrate the data transmission method based on an intelligent driving vehicle and a cloud data platform according to the present invention, and to achieve the intended purpose, the following detailed description, in conjunction with the accompanying drawings and specific operating methods, provides a more detailed explanation of the specific implementation methods, features, and effects of the data transmission method based on an intelligent driving vehicle and a cloud data platform proposed in this invention. In the following description, the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of this application.

[0025] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not imply the presence or addition of one or more other elements or combinations thereof.

[0026] Please see Figure 1 The embodiments of the present invention include:

[0027] A control method for replenishing the battery of an electric vehicle is proposed. By adding a battery undervoltage wake-up circuit to the DC-DC converter connected in parallel with the battery, when the battery voltage is too low, the battery undervoltage wake-up circuit generates a wake-up signal to wake up the new energy vehicle controller VCU (Battery Management System), DC-DC converter, and T-BOX (Telematics BOX), thereby realizing the replenishment of the battery.

[0028] Combination Figure 2 The battery undervoltage wake-up circuit includes a Zener diode Z1, resistors R1-R3, and an N-channel MOSFET Q1. Zener diode Z1 is connected in parallel between battery voltages KL30 and KL15, with its positive terminal connected to KL15 and its negative terminal connected to KL30. Resistor R1 is connected in parallel between battery voltage KL15 and the gate of the N-channel MOSFET. One end of resistor R2 is connected to the gate of the N-channel MOSFET, and the other end is grounded. Resistor R3 is connected in parallel between battery voltage KL30 and the drain of the N-channel MOSFET. The drain of the N-channel MOSFET is the output terminal WAKEUP.

[0029] When the vehicle is in ignition mode, a stable gate voltage is provided for the N-channel MOSFET Q1, and the wake-up signal is low at this time; R2 limits the current flowing through Z1, which serves as a protection function.

[0030] When the vehicle is off, if the battery voltage KL30 is higher than the threshold, the N-channel MOSFET Q1 will turn on, and the wake-up signal will be low.

[0031] When the vehicle is off, if the battery voltage KL30 is higher than the threshold, the N-channel MOSFET Q1 will turn off, the wake-up signal will be pulled up to KL30, and the DC-DC device will be woken up.

[0032] Specifically, the threshold is approximately the threshold of the Zener diode Z1.

[0033] Furthermore, the DC-DC device utilizes a network to wake up the VCU, BMS, and T-BOX. The VCU controls the DC-DC device, enabling the DC-DC function to replenish the battery.

[0034] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A control method for replenishing the battery of an electric vehicle, characterized in that, By adding a battery undervoltage wake-up circuit to the DC-DC device connected in parallel with the battery, when the battery voltage is too low, the battery undervoltage wake-up circuit generates a wake-up signal to wake up the VCU, BMS, DC-DC, and T-BOX, thereby replenishing the battery power. The battery undervoltage wake-up circuit includes a Zener diode Z1, resistors R1, R2, and R3, and an N-channel MOSFET Q1. The Zener diode Z1 is connected between the battery voltages KL30 and KL15. Resistor R1 is connected between the battery voltage KL15 and the gate of the N-channel MOSFET. One end of resistor R2 is connected to the gate of the N-channel MOSFET, and the other end is grounded. Resistor R3 is connected between the battery voltage KL30 and the drain of the N-channel MOSFET. The drain of the N-channel MOSFET is the output terminal. When the vehicle is in the ignition state, a stable gate voltage is provided to the N-channel MOSFET Q1, and the wake-up signal is low at this time. When the vehicle is off, if the battery voltage KL30 is higher than the threshold, the N-channel MOSFET Q1 will turn on and the wake-up signal will be low. When the vehicle is off, if the battery voltage KL30 is lower than the threshold, the N-channel MOSFET Q1 will turn off, and the wake-up signal will be pulled up to KL30 to wake up the DC-DC device.

2. The control method for replenishing power to an electric vehicle battery according to claim 1, characterized in that, The DC-DC device uses a network or hardwired connection to wake up the VCU, BMS, and T-BOX.

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