What should we notice when changing electric batteries?

After electric vehicle battery heated, it is necessary to cooling and battery can charge only when battery temperature of electric vehicle returns to normal. The installation position of electric vehicle battery should ensure good heat dissipation as much as possible. When it is overheated, stop charging, and check charger and electric vehicle battery. When electric vehicle battery has a shallow discharge, depth or when ambient temperature high, charging time should shorter

Overcharging will increase the water loss of the electric vehicle battery, which will accelerate the corrosion of the grid and soften the active material, which will increase the probability of deformation of the electric vehicle battery. Should avoid the occurrence of overcharging; choose the charger parameters to be well matched with the electric vehicle battery, to fully understand the operating conditions of the electric vehicle battery during the hot season, as well as changes throughout the service life. Do not place the battery of the electric vehicle in an overheated environment during use, especially when charging. Keep away from heat.

Electric vehicle battery use precautions

Prevent over discharge

After the electric vehicle battery discharged to the termination voltage, the continued discharge called over discharge. Over-discharge can seriously damage the electric vehicle battery, which is extremely detrimental to the electrical performance and cycle life of the electric vehicle battery.

When the electric vehicle battery discharges to the end voltage, the internal resistance is large, and the electrolyte concentration is very thin, especially in the hole and surface of the electrode plate is almost neutral. When the over-discharge, the internal resistance has a tendency to heat, the volume expands, and the discharge current is large. Significant fever (even heat deformation), the concentration is particularly large, there is an increased possibility of short circuit of the branch crystal, and at this time will crystallize into larger particles, that is, irreversible salinization, which will further increase the internal resistance, charge recovery The ability is very poor and can't even be fixed.

Electric vehicle battery use precautions

Prevent short circuit

When the electric vehicle battery is short-circuited, its short-circuit current can reach several hundred amperes. The tighter the short-circuit contact, the larger the short-circuit current, so that all the connected parts will generate a lot of heat, and the heat generated in the weak link will be more, which will blow the joint and cause a short circuit. The electric vehicle battery may generate explosive gas (or explosive gas collected during charging), and sparks when the connection is blown, which may cause the electric vehicle battery to explode;

If the short-circuit time of the electric vehicle battery is short or the current is not particularly large, it may not cause the connection to be blown, but the short-circuit will still be overheated, which will damage the adhesive around the connecting strip, leaving it leaking and other hidden dangers. .

Therefore, the electric vehicle battery must not be short-circuited. Special care should take during installation or use. The tools used should insulate. When connecting, first connect the electrical appliances other than the battery. After checking, there is no short circuit. Finally, connect the electric vehicle. The battery and wiring specifications should well insulated to prevent the overlap from crushed and ruptured.

Electric vehicle battery use precautions

Prevent loose connections and loose connections

The electric vehicle should withstand relatively strong vibration during operation, and the reliability of all connections should evaluated. The connector should be equipped with a "self-locking" function to prevent it from falling off during vibration and pulling. The connection to the battery lug of the electric vehicle should take. The connector solder to it with solder, and the connector romped to connection. If contact not strong and degree light, conduction will poor, line contact part will heated. the line loss will be large, the output voltage will be low, affecting the motor power, making the mileage reduced or unable to ride normally; If the contact is not secure, a large amount of heat will be generated, which will affect the combination of the terminal and the sealant. When the time is long, liquid leakage will occur.

If contact is not strong during driving or charging, an open circuit may occur. When the circuit is broken, a strong spark may be generated, which may explode the explosive gas inside the battery of the electric vehicle (especially the electric vehicle battery that has just been charged, because the battery There are many explosive gases in the interior, and the battery of the electric vehicle is sufficient. The spark is strong when the circuit is broken, and the possibility of explosion is quite large.)

1. The voltage of the newly replaced battery should be the same as the original one, and the capacity can be different, but increasing the capacity can generally extend the driving range.

2. It is best to choose a battery brand with a good reputation.

3. The current should be large (small battery requires 15A and large battery requires 24A).

4. Must ask for a warranty, warranty period (small battery for 15 months, large battery for 12 months).

[Notes on changing the battery]

1. run out of battery power and then charge for 12 hours on the first charge.

2. The first three charges must guaranteed to be charged for more than 10 hours in a constant current state, and each subsequent charge must be guaranteed for more than 8 hours, but it is not suitable for too long.

【working principle】

220v AC power suppresses by T0 bidirectional filtering, D1 rectification pulsating DC, and then C11 filtering forms a stable DC current about 300V. U1 is a TL3842 pulse width-modulation integrated circuit. 5 pin is negative pole of power supply, 7 pin is positive pole of power supply, 6 pin is pulse output, and the FET Q1 (K1358) 3 pin is the maximum current limit. Adjusting resistance of R25 (2.5 ohm) can adjust the maximum current of the charger. . Pin 2 is voltage feedback and can adjust output voltage of charger.

The page contains the contents of the machine translation.