Wading electric shock prevention system of electric automobile

Abstract

The invention discloses a wading electric shock prevention system of an electric vehicle, which is characterized in that a leakage current grabbing unit is additionally arranged in a battery pack, and the leakage current grabbing unit is connected in parallel with a manual maintenance switch in the battery pack. The system also has the advantages that the change conditions of voltage and current are collected through the voltage and current sensor and transmitted to the signal terminal, the change conditions of leakage voltage and current are displayed on the instrument, checking and updating are prompted in time, and fire accidents caused by line aging, wire end exposure and the like are avoided.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicles, and in particular to a water-resistant electric shock prevention system for electric vehicles. Background Art

[0002] Oil prices and environmental factors are driving the rapid development of electric vehicles. The number of electric vehicles on the road is expected to continue to grow. The safety of electric vehicles is gaining increasing attention. When electric vehicles are driven in submerged environments, their electrical components are prone to failure, such as breakdowns, inability to open window regulators, and electric sunroofs. Furthermore, electric vehicles operating in submerged environments pose a risk of electrical leakage, posing a life-threatening risk to users.

[0003] To address these technical issues, existing electric vehicles often employ waterproof sealing to prevent water from contacting electrical components. However, due to the numerous electrical components on a vehicle, water molecules can penetrate any pore, making it difficult to achieve 100% waterproofing. This poses significant safety risks and is also very costly. Summary of the Invention

[0004] The purpose of the present invention is to provide an electric vehicle water-proof electric shock system, which is used to solve the problems of electric shock risk to vehicle occupants and the life-threatening danger to users caused by failure of the vehicle's electrical units due to water leakage caused by contact with water.

[0005] To achieve the above object, the present invention adopts the following technical solutions: The electric vehicle water-crossing electric shock prevention system described in the present invention adds a leakage current capture unit in the battery pack. The leakage current capture unit is connected in parallel with the manual maintenance switch in the battery pack. The leakage current capture unit absorbs current to prevent leakage current from leaking into the water body, and the absorbed leakage current is returned to the power supply circuit for continued use, which can ensure that electrical components on the circuit do not stop working due to immersion in water; thus, the electric new energy vehicle can drive normally in deep water.

[0006] Furthermore, the leakage current capture unit includes a leakage backcurrent harmonic suppression device and a data processing module.

[0007] Furthermore, the leakage backcurrent harmonic suppression device can absorb current, prevent leakage current from leaking into the water body, and absorb the leakage current and return it to the power supply circuit.

[0008] Furthermore, the data processing module determines whether leakage occurs based on the current and voltage sensor signals arranged in the MCU; when leakage occurs, a start signal is sent to the leakage backcurrent harmonic suppression device, and the leakage current and leakage voltage are transmitted to the instrument, and an alarm is issued.

[0009] The advantage of the present invention is that when leakage occurs in the vehicle's high-voltage lines and working circuits, generating leakage current, an electromagnetic field loop is generated within the entire tram's electrical environment to absorb the leakage current, saving energy, eliminating voltage differences, and ensuring that the lines and electrical components on them can operate normally in submerged and deep-water environments. For example, this ensures that electric window lifts, electric sunroofs, and doors can operate normally in deep-water environments, allowing occupants to escape safely in drowning situations, thereby buying valuable time for self-rescue and rescue. It can also ensure safe voltage and current in the event of circuit overload, line overload, or electrical overheating, effectively reducing the risk of damage to electrical components.

[0010] At the same time, the system eliminates voltage differences, allowing the vehicle body to maintain a safe voltage even in the event of water leakage, thereby preventing the risk of electric shock. This anti-electric shock technology overturns the traditional sealing method used by those skilled in the art to prevent water leakage and electric shock, and can significantly reduce the cost of sealing and waterproofing vehicle electrical components.

[0011] The advantages of the present invention also lie in that the voltage and current changes are collected by voltage and current sensors and transmitted to the signal terminal, the changes in leakage voltage and current are displayed on the instrument, and timely prompts are given to check and update, thus avoiding fire accidents caused by line aging, bare wire leakage, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the entire vehicle circuit in the electric vehicle water wading anti-electric shock system of the present invention.

[0013] Figure 2 This is a schematic diagram of the relationship between the leakage current capture unit in the battery pack, the MCU and the instrument in the electric vehicle water wading anti-electric shock system described in the present invention. DETAILED DESCRIPTION

[0014] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0015] The electric vehicle water-crossing anti-electric shock system described in the present invention adds a leakage current capture unit in the battery pack PAKE. The leakage current capture unit is connected in parallel with the manual maintenance switch in the battery pack, which is very convenient for installation and maintenance and does not affect the electrical frame layout of the existing electric vehicle battery pack.

[0016] The leakage current capture unit includes a leakage backflow harmonic suppression device and a data processing module. The leakage backflow harmonic suppression device absorbs current, preventing it from entering the water and returning it to the power supply circuit. The inventors used a finished product of the leakage four-fort manufactured by Hongnuo Technology.

[0017] The data processing module will determine whether leakage occurs based on the current and voltage sensor signals arranged in the MCU; when leakage occurs, it will send a start signal to the leakage backcurrent harmonic suppression device, and transmit the leakage current and leakage voltage to the instrument, and issue an alarm.

[0018] The specific action relationship is: When a vehicle is submerged in water, a transient surge in voltage and current occurs in the vehicle's high-voltage circuits. The current and voltage sensors in the MCU transmit these signals to the leakage current capture unit in the battery pack. After the data processing module in the leakage current capture unit determines leakage, it sends a start signal to the leakage backflow harmonic suppression device in the leakage current capture unit. This device then begins operating, actively capturing the leakage current and keeping the current and voltage in the vehicle's high-voltage circuits within safe ranges. The data processing module in the leakage current capture unit then transmits the leakage current and voltage values ​​to the instrument panel, which displays an alarm, prompting the vehicle owner to promptly repair the circuits. However, all electrical components in the vehicle's circuits remain operational. This ensures that electric new energy vehicles can operate normally in deep water. Even if a power short circuit occurs in deep water, there is no risk of leakage in the high-voltage circuit components, ensuring both normal vehicle operation and the safety of the user. Even if the vehicle breaks down in deep water, the window lifts, electric sunroof, doors, etc. can still be unlocked and opened normally, avoiding the risk of drowning.

[0019] like Figure 1 As shown, a schematic diagram of the electric vehicle water-proof electric shock system of the present invention in the whole vehicle circuit is shown. The battery pack is connected to the battery management system BMS and communicates with the vehicle management system VMS through the CAN bus. The leakage current capture unit is arranged in the battery pack. The high voltage electricity is connected from the battery pack to form a return field with the entire high voltage circuit, which controls the stability of the current and voltage of the electrical components on the high voltage line (MCU, motor, DCDC high and low voltage converter, etc.). Even if leakage occurs due to water immersion, the intelligent device starts to capture the leakage current, eliminate the potential difference, and convert it into normal current to return to the normal power supply circuit. The high voltage electricity of the battery pack can provide power for the 12V battery and other on-board electrical equipment through the DCDC high and low voltage converter.

[0020] like Figure 2The figure shows the relationship between the leakage current capture unit in the battery pack, the vehicle microcontroller unit MCU, and the instrument in the electric vehicle water wading anti-electric shock system of the present invention. The vehicle microcontroller unit MCU is connected to the vehicle control system, the instrument display system, the motor, and the battery pack. The MCU receives voltage and current signals collected by sensors, including current and voltage sensors, and then sends them to the leakage current capture unit in the battery pack. The leakage current capture unit in the battery pack sends the leakage current, leakage voltage, and power level to the instrument.

[0021] The present invention can also monitor the temperature, load and other data of the new energy electric vehicle circuit, and can realize data exchange with the user through the background. By using the Internet of Things technology, the voltage and current conditions in the entire new energy electric vehicle high-voltage circuit can be displayed on the customer terminal, allowing the user to grasp the vehicle status in time and avoid accidents.

[0022] Compared with the existing technology, the present invention can truly achieve waterproofing of new energy electric vehicles. In a flooded environment of a new energy electric vehicle, if accumulated water enters the inside of the pipelines and electrical components, there will be no voltage overload damage to the electrical components, and there will be no leakage and electric shock that endangers the user's life. This allows new energy electric vehicles to be driven in a flooded environment and provide people with safety. At the same time, the present invention can also recycle the leakage current to achieve energy-saving effects. When a new energy vehicle is equipped with the system of the present invention, there is no need to improve the waterproof level of the electrical components and circuits of the new energy electric vehicle, which can correspondingly reduce the cost of sealing and waterproofing of the vehicle.

[0023] The core concept of the electric vehicle water-proof electric shock system of the present invention is to use intelligent devices to capture leakage current in high-voltage lines and working circuits to eliminate voltage differences and ensure that the lines and electrical components on the lines can operate normally in submerged and deep water environments. The electric vehicle water-proof electric shock system can ensure the circuit safety of electric vehicles in deep water environments, changing the previous waterproofing concept. Before the present invention, vehicle waterproofing mainly increased the waterproof level of the lines and electrical components to achieve waterproofing. Now, the leakage current of the electric vehicle is captured and returned to the main line. This saves energy without adding additional costs to the waterproof level of electrical components. At the same time, the electric vehicle water-crossing anti-electric shock system of the present invention adds Internet of Things monitoring technology, which collects voltage and current changes through voltage and current sensors and transmits them to the signal terminal, and can display the changes in leakage voltage and current on the instrument, which can further ensure the safety of the circuits and electrical components of the entire tram, and can ensure that the electric window lifts and electric sunroof of the tram can operate normally in a deep water environment, so that tram occupants can escape in a drowning environment; it can ensure that the circuits and electrical components of the tram also ensure a safe voltage when leaking to the body, avoiding potential electric shock safety of personnel; it can monitor leakage current and leakage voltage, avoid problems caused by current and voltage changes due to line aging, and have the effect of preventing fire.

Claims

1. An electric vehicle wading protection system for electric shock, characterized in that: A leakage current capture unit is added in the battery pack, and the leakage current capture unit is connected in parallel with the manual maintenance switch in the battery pack.

2. The electric vehicle water wading protection system according to claim 1, characterized in that: The leakage current capture unit comprises a leakage backcurrent harmonic suppression device and a data processing module.

3. The electric vehicle water wading protection system according to claim 2, characterized in that: The leakage current backflow harmonic suppression device can absorb current, prevent leakage current from leaking into the water body, and absorb the leakage current and return it to the power supply circuit.

4. The electric vehicle water wading protection system according to claim 2, characterized in that: The data processing module determines whether leakage occurs according to the current and voltage sensor signals arranged in the MCU; when leakage occurs, a start signal is sent to the leakage backflow harmonic suppression device, and the leakage current and leakage voltage are transmitted to the instrument, and an alarm is issued.

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