How to distinguish between lithium battery and lead-acid battery charger?

Speaking of lead-acid battery chargers, the first application we think of is electric bicycles. In fact, according to their structure and usage, the industry divides lead-acid batteries into four categories: 1. Start-up, 2. Power use, 3. Fixed valve-controlled sealed type, 4. Small valve-controlled sealed type. This method is important to classify in terms of structure, but also wants to take into account the use. It is still difficult for non-battery practitioners to understand it. If it is classified from the perspective of pure market application, it is better to understand. According to this standard, lead-acid batteries are classified There are two categories: 1. Main power supply, including: communication equipment, industrial instrument equipment, power control machine tools, and portable equipment; 2. Backup power supply, including: emergency equipment, communication base station, electronic switch system, and solar energy system. This application classification has many intersections with the applications of lithium batteries. In terms of market capacity, this intersection is critically concentrated on power lithium-ion batteries, such as electric bicycles and small passenger cars. In the field of power lithium-ion batteries, the most important thing is the dispute between these two technologies. Therefore, it is representative for us to compare the difference between lead-acid batteries and lithium batteries in this field. Otherwise, the reference is uncertain, and the comparison is endless. . All the differences between the two lithium battery chargers are based on the performance of the materials. The positive and negative materials of lead-acid batteries are lead oxide, metallic lead, and concentrated sulfuric acid; lithium batteries have four components: the positive electrode (cobalt acid). Lithium/lithium manganate/lithium iron phosphate/ternary), negative graphite, separator and electrolyte, the resulting differences are: 1. Different nominal voltages: single lead-acid battery 2.0V, single lithium battery 3.6V 2. The energy density is different: 30WH/KG for lead-acid batteries, 110WH/KG for lithium batteries; 3. The cycle life is different, lead-acid batteries are evenly 300-500 times, and lithium batteries are more than a thousand times, from two lithium-ion bicycles In terms of mainstream technology, the difference between ternary lithium batteries and lithium iron phosphate batteries is also relatively large. The discharge life of ternary lithium batteries is 1000 times, and the life of lithium iron phosphate batteries can reach 2000 times; 4. Charging method: Lithium battery is limited. Voltage-limiting current method, that is, given a limited threshold for current and voltage, and there are many charging methods for lead-acid batteries. The most important ones are: constant current charging method, constant voltage charging method, stage isocurrent charging method And floating charge, can not be described one by one. Lead-acid batteries and lithium battery chargers have different charging control methods. The voltage levels of lithium batteries and lead-acid batteries do not match. There are also many types of lithium batteries, and battery functions and battery protection board parameters may be different. Lithium battery: Lithium battery charging control is to charge according to the stable current first, and then when the battery voltage rises to 4.2V, the voltage does not rise again, the charger tests the current, assuming that the current is less than a certain value, the charging is completed. Lithium batteries are active in overcharging, so the protection circuit is messy. For a single cell with a nominal 3.6V battery, the highest charging rated voltage is 4.2V, and the upper limit of the allowed fault is not more than 1%. Lead-acid battery: Lead-acid battery, the charging current of the ambition is pulsed, and the pulse charging is best when the 50-60HZ mains power supply we use is directly rectified and not filtered. This is based on the simple circuit and low cost. Method), because the self-discharge rate of lead-acid batteries is relatively large, when power frequency charging is selected, the stable voltage charging method is generally used (the current must also be limited). Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Which kinds of negative aspects should be paid attention to when using lithium battery cells?