Everyone knows the development trend of new energy electric vehicles, especially in the electric vehicle market after 2021, mainstream electric vehicles have basically achieved the same price as fuel vehicles, and compared with traditional fuel vehicles, it is obvious that in terms of vehicle costs, new energy takes pure electric vehicles as an example, and ordinary 40kWh batteries can last 300 kilometers, In the pricing method of 2 yuan/kilowatt hour for charging piles, the electricity charge per kilometer is less than 30 cents. Of course, if you choose household charging or cheaper charging piles, the price will be even lower.

In terms of traditional fuel vehicles, the fuel consumption is 7 liters per hundred kilometers, and the fuel cost per kilometer is about 50 cents, New energy vehicle charging pile So even if the subsidy for new energy electric vehicles decreases and the price rises, many car owners are still more willing to choose electric vehicles? However, electric vehicles also have some unavoidable shortcomings.

Generally speaking, the most feared thing for electric vehicles is that they have no power, or the circuit has problems, and suddenly they can't drive on the road.

When the electric car runs out of power, remember these three tips!

01

Early prevention

Pure electric vehicles generally have a battery power display. The owner can estimate the remaining range based on the current power, and then make full use of the charging pile client to find the charging pile in front, so that they can charge in time before the power is used up.

02

Prepare a on-board charging box

Now many electric vehicle manufacturers will give a free gift when buying a car, and only need to carry it with the car.

03

Free trailer rescue for automobile manufacturers

When the electric vehicle is completely out of power and cannot run, you can directly find the manufacturer's phone number of the electric vehicle and ask them for trailer assistance.

When some common faults occur in new energy vehicles, how to repair them?

1. Visual diagnosis

When the electric vehicle circuit breaks down, sometimes there will be abnormal phenomena such as smoke, sparks, abnormal noise, burning smell, heating, etc. Electric vehicle charging pile These phenomena can be felt through the eyes, ears, nose and body, so that the fault location can be directly judged.

For example, when an electric vehicle is running, it suddenly finds that both the turn signal and the turn indicator are not on. Touch it with your hand and find that the flasher is hot, indicating that the flasher has been burned.

2. Open circuit method

In case of grounding (short circuit) fault of electric vehicle circuit equipment, open circuit method can be used to judge. After the circuit section about to be suspected of grounding fault is broken, judge the location and cause of the circuit grounding according to whether the grounding fault still exists in the electrical equipment.

If the electric horn sounds for a long time when the electric vehicle is running, the wire on the relay "button" terminal can be disconnected. At this time, the electric horn stops ringing, indicating that there is grounding in the circuit from the horn button to the relay.

3. Short circuit method

Short circuit fault in electric vehicle circuit can also be judged by short circuit method. The circuit that is about to be suspected of short circuit fault is short circuited. Observe the change of instrument pointer or the working condition of electrical equipment to determine whether there is short circuit fault in the circuit.

For example, if you suspect that various switches in the electric vehicle circuit are faulty, you can use wires to short the switch to determine whether the switch is good or bad.

4. Lamp test method

The lamp test method is to use an electric vehicle bulb as the test lamp to check whether there is an open circuit fault in the circuit. New energy vehicle maintenance For example, connect one end of the test lamp to the "armature" terminal of the alternator, and ground the other end. If the lamp does not light up, there is an open circuit between the battery and the alternator "armature" terminal; If the light is on, this section of circuit is in good condition.

At present, the mainstream new energy vehicles mainly include hybrid electric vehicles, pure electric vehicles, etc., all of which are equipped with batteries, motors, and other components, with a high-voltage power of about 500 volts. Therefore, when maintaining new energy vehicles, professional tools and equipment must be used to do a good job of safety protection.

What tools and equipment are needed for the maintenance of new energy electric vehicles?

01 Detection instrument and

Professional disassembly tools

Megohmmeter: during the operation of the vehicle, collision and friction will inevitably occur, which will lead to the decrease of insulation between the high-voltage circuit and the vehicle chassis. Therefore, first check whether the insulation resistance of high-voltage cables and parts to the vehicle body is within the specified value range.

Multimeter: Multimeter is a multi-functional, multi range and portable electronic instrument, which can measure AC, DC current, voltage, resistance and other electrical parameters. The multimeter used should comply with CAT III safety level.

Current clamp meter: New energy vehicles often need to measure the current in the wire for maintenance and diagnosis. Since there is a large alternating current in the wire of the drive system, the indirect test must be carried out with the current clamp meter. Clamp on ammeter is a combination of current transformer and ammeter, which can measure current without cutting off the circuit.

Insulated handle disassembly tools: processed with insulating materials and suitable for electrical system disassembly and assembly, including torque wrench, fast wrench, screwdriver and other tools, must be equipped with insulated handle with withstand voltage of more than 1000V.

02 Diagnostic instrument

The new energy vehicle diagnostic apparatus is also divided into special type and general type. The special type is for a certain brand of vehicle, with comprehensive functions and more permissions, such as BAIC BJEV diagnostic apparatus.

Universal models include many brands and models, with multiple functions and strong practicability. For example, Langren H6 (supports both fuel vehicles and new energy vehicles), covering many new energy vehicles from BYD, BAIC, SAIC, Dongfeng Xiaokang, Geely and other manufacturers, can carry out diagnostic tests on battery, motor and other systems and parts, and support anti-theft matching, dashboard repair Headlamp adjustment and other special functions can be upgraded with one button, which is suitable for maintenance shops and repair shops.

03 Protective equipment

Maintenance personnel shall wear safety protection appliances including insulating gloves, insulating shoes, goggles, etc. Other operating tools shall also be wrapped with insulating tape in advance to remove bare metal parts other than the contact points with standard parts, so as to avoid high voltage accidents caused by instrument failure or the contact of bare metal parts of operating tools with live parts by mistake.

The above is some common sense of electric vehicle maintenance, but I make up some warm tips. The high voltage in electric vehicles has an impact on its maintenance safety. Non professionals should not operate it easily! Because it is important to operate the vehicle safely when repairing body and internal faults, it is always important to follow standardized procedures to ensure safety and efficiency when repairing the vehicle.