Analysis of the working principle of lithium battery charger and lead-acid battery charger

1. The working principle of lead-acid battery charger The meaning of lead-acid battery: the electrode is mainly made of lead and its oxide, and the electrolyte is a kind of battery with sulfuric acid solution. It has the characteristics of wide range of charging voltage and battery capacity, power saturation to prevent overcharging, automatic short-circuit protection, high safety factor, low heat, high efficiency, no damage to the battery, small size and light weight, easy to install and so on. It is the most advanced smart charger on the market. It can be used to charge 12V/1Ah-28Ah batteries and accumulators for motorcycles, electric vehicles, and automobiles. The so-called three-stage refers to constant current, constant pressure, and eddy current. The red light-emitting diode indicates that it is in the constant current or constant voltage stage, and it turns green to indicate that it is in the trickle stage. Normally, the battery can be really full after charging for several hours after the light turns green. 2. The working principle of lithium battery charger The lithium battery charger is a charger specially used to charge the lithium battery. Lithium batteries have higher requirements for chargers and need to protect circuits. Therefore, lithium battery chargers usually have higher control precision and can charge lithium batteries with constant current and voltage. Lithium battery charging for electric vehicle users is much simpler than charging when lithium battery is formed, that is, constant current and voltage limiting charging. The most common 48V car lithium tweezers, or 14 strings of ternary batteries. The lithium battery charger also has a charging current detection and comparison circuit, and the charging indicator light can also change from red to green. Can electric vehicle lithium batteries and lead-acid battery chargers be universal? The answer is no. This is because lead-acid battery chargers are generally set to two-stage or three-stage charging mode, and the voltage levels of lithium batteries and lead-acid batteries do not match. There are also many types of lithium batteries, and battery performance and battery protection board parameters may be different. Therefore, lithium batteries are not the same as lead-acid batteries, and there are universal battery chargers. Generally speaking, lithium batteries are equipped with special chargers when they leave the factory. In order to protect the lithium batteries, it is best to use the corresponding special chargers for lithium batteries. The difference between lithium battery charger and lead-acid charger At present, the chargers for electric vehicles on the market are mainly of switching power supply type, which have the advantages of power saving, small size, light weight, and mature technology. The freight tricycle with only lead-acid batteries also uses a power frequency transformer-type charger, which is simple, reliable, cheap, and has low requirements for the use environment. The switching power supply charger is essentially a regulated power supply. Specifically, there are two types: half-bridge with pulse width modulation chip TIA94 as the core and flyback type with pulse width modulation chip UC3842 as the core. The latter occupies more than 90% of the market due to the advantages of low cost and cycle-by-cycle protection. The following specific circuits are based on these two types of typical circuits for specific analysis. Related matters to pay attention to when charging the lithium battery 1. In order to prolong the life of the lithium battery, the lithium battery should be charged and discharged frequently. It is necessary to develop the habit of recharging the electric bicycle after using 80% of the electricity, and not waiting for the electricity to run out. In addition, lithium batteries must not be stored for a long time. 2. When charging the rechargeable battery of an electric vehicle, the electric door lock must be closed and the battery cannot be turned upside down. When charging, it should be fully charged at one time, not multiple charging. 3. Electrical appliances should not be stored in the state of power loss, so when the battery is not in storage, you need to fully charge the battery once a month. 4. The lithium battery needs to use the matching charger when charging. Because the battery raw materials and the lithium battery processing technology are different, the technical requirements of the charger are also different, so only the use of a dedicated charger can make the lithium battery life longer. And prevent safety hazards. 5. When the lithium battery is out of power, you should turn off the power to ride, and can't use the rebound voltage to prevent serious power loss, so as to extend the battery life. 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