Which kinds of lead-acid replacement lithium-ion batteries for electric vehicles should be paid attention to?

Lead-acid batteries to replace lithium-ion batteries mainly pay attention to the following points: 1. Battery space problems. It is feasible to replace lead-acid batteries and lithium-ion batteries with the same capacity and voltage, but it is necessary to consider whether the size of the battery can be installed in the original position. It is not protruding or squeezed, because squeezing and moisture will damage the battery and cause a short circuit. 2. You must use a charger that matches the type of battery. Lead-acid batteries and lithium-ion batteries have the same capacity and voltage. You can't use the charger indiscriminately because the charging voltage and current required by the two batteries are not equal in each stage. When charging lead-acid batteries, the charger voltage is high. Li-ion batteries have higher technical requirements, so when charging, the charger adopts constant current and constant voltage charging, and lead-acid charging lithium batteries will cause overshoot and explosion hazards. 3. Socket replacement Because the interface of the lead-acid battery and the lithium-ion battery are different, you must use a matching socket to change the battery. Do not use it when you can plug it in, which will easily cause the lithium-ion battery to short-circuit and cause danger. 4. The original charging port cannot be used for charging after the battery is replaced. Because the charging principle is different, if the original charging port on the electric vehicle is used for charging, the circuit will be damaged and the lithium-ion battery will be short-circuited. 5. Cut-off voltage Discharge cut-off voltage u003d number of pieces * battery discharge cut-off voltage. For example, a 48V lead-acid battery is 4*10.5u003d42. Take a 48V lead-acid battery as an example, corresponding to 14 strings of ternary, (48/3.6u003d13.333), or 15 strings of lithium iron (48/3.2u003d15). 6. According to the motor Power and controller selection protection board. For example, a car is a 500-watt motor and a 60V battery. The commonly used formula for selecting the protection board current: (500/60)*(2.2~2.5). Some cars have older motors, and the current will increase when the motors are demagnetized. The protection board current can be larger. 7. Replace the fuse. The lithium-ion battery has strong power and high current, and the original fuse of the car may be burned out when it suddenly starts. 8. Pay attention to capacity and stroke to replace lithium-ion batteries with the same capacity and voltage. For batteries with the same voltage and capacity, lithium-ion batteries have a longer mileage than lead-acid batteries. Under the same nominal capacity, lithium-ion batteries run 10% to 20% more mileage than lead-acid batteries. In addition to small size and light weight, there is another important reason. Lead-acid batteries have poor high-current characteristics, and only have a capacity of 50% when discharged at 1C, while lithium-ion batteries have high capacity when discharged at 1C or even 2C. 9. Be waterproof (the battery is labeled with a sense of water inside, and it changes color when exposed to water) Waterproof rating: IP**, the two numbers behind, the first number is the solid state protection level (range 0-6); the second number is Liquid protection level (range is 0-8). The larger the number, the stronger the protection capability. The battery is generally sealed with sealant or filled with quick sol to make the battery waterproof. Lithium-ion batteries that are well protected against water need to be tested for air tightness or IP67 water resistance. Generally, a high-precision air-tightness tester is used to detect the air-tightness of lithium-ion batteries. 10. Do a good job of insulation. If you install a plug, solder the joint to prevent short circuit due to heat. 11. Should I replace the controller? If you change a lithium iron phosphate battery, you don’t need to replace the controller; if it’s a ternary lithium ion battery, you don’t need to replace the controller, but the undervoltage protection point of a ternary lithium ion battery is lower than that of a lead-acid battery. When the undervoltage protection point is reached, it enters the undervoltage protection state, but the lithium-ion battery has not reached the undervoltage protection point at this time, so the power of the ternary lithium-ion battery cannot be used up, resulting in insufficient cruising range. 12. Is the instrument panel replaced? The lead-acid battery instrument panel is designed based on the voltage and discharge curve of the lead-acid battery. Because the charge-discharge curve of the lithium-ion battery is different from that of the lead-acid battery, the voltage display will be inaccurate after the battery is replaced. For example, the voltage of a lithium iron phosphate battery will drop after the power is disconnected. This is determined by the characteristics of the battery cell. In fact, the battery is full, which does not affect the use and does not need to replace the instrument panel. However, it should be noted that the lithium-ion battery power drops from 100% to 80%. When it drops from 40% to 10%, the meter indication drops quickly, and the display in other segments does not change much. Therefore, when the instrument panel shows that the battery power drops below 40% during use, the actual battery power of the lithium-ion battery may only be about 10%, and it needs to be charged as soon as possible to guard against over-discharge of the battery. 13. Pay attention to the battery type. If it is a split-port lithium-ion battery, be sure that the charging port cannot be used for discharging. If the battery is incorrectly inserted into the charging port during discharging, the battery will be damaged, and the battery may be short-circuited, which may be dangerous. 14. Do not charge indiscriminately. Li-ion batteries cannot be charged at the fast charging stations on the street. They are only suitable for lead-acid batteries. Due to the high charging current of the fast charging station, the battery will be at risk of overcharging. To use a dedicated lithium battery charger. 13. Change the charging method. Statement: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What is the difference between polymer lithium ion battery and lithium ion battery?