Causes of chaos in lead-acid battery recycling

An article to help you understand the 48v40a lithium battery assembly.

Qianjiang City 48v40a lithium battery assembly 18650, these figures in the 18650 representing appearance of size: 18 refers to the battery diameter of 18.0mm, 650 refers to battery height of 65.0mm. Common 18650 batteries divided into lithium ion batteries, lithium iron phosphate and nickel hydrogen batteries. The voltage and capacity specifications are that nickel-hydrogen battery voltage is 1.2V, common capacity is 2500MAH, and lithium-ion battery voltage is 3.6V. Common capacity is 1500MAH-3100MAH. Qianjiang 48v40a lithium battery assembly

1. Definition

Lithium battery (Li-ion, lithium ion battery): Lithium-ion battery has the advantages of lightweight, large capacity, no memory effect, and thus 18650 lithium battery 18650 lithium battery

Universal Applications - Many digital devices use lithium-ion batteries for power, although they are relatively expensive. Lithium-ion batteries have a high energy density, and their capacity is 1.5 to 2 times that of nickel-hydrogen batteries of the same weight, and has a very low self-discharge rate. In addition, the lithium-ion battery has almost no "memory effect" and does not contain toxic substances, which is also an important reason for its wide application. In addition, please note that the outside of the lithium battery is generally marked with English 7.2Vlithiumionbattery (lithium battery) or 7.2Vlithiumsecondarybattery (lithium secondary battery), 7.2Vlithiumionrechargeablebattery (rechargeable lithium battery), so users must see the appearance of the battery block when purchasing the battery. Prevent cadmium nickel and nickel hydride batteries from being mistaken for lithium batteries because they do not see the type of battery. For example, a set of equipment with an investment of 39,000 yuan requires 1 or 2 workers. There are no environmental temperature requirements and no geographical restrictions (no contaminants during production). Pure manual operation, full computer control, no restrictions on the construction site. Qianjiang 48v40a lithium battery assembly

2, type

The difference between the lithium battery standard 3.7V or 4.2V is the same. It is just that the manufacturer's label is different. 3.7V refers to the platform voltage (i.e., average voltage) that discharged during battery use, while 4.2 volts refers to the voltage at full charge. Common rechargeable 18650 lithium battery, the voltage is 3.6 or 3.7v standard, 4.2v when fully charged, this has little to do with the power (capacity), the mainstream capacity of 18650 battery from 1800mAh to 2600mAh, (18650 power battery capacity) More than 1200~1600mAh), the mainstream capacity even has the standard 3500 or 4000mAh or more. (Remind everyone, if the 18650 above 3100mAh domestically produced, it can considered a fake. The maximum capacity of mass production is 3400mAh. ).

It considered that the lithium batteries no-load voltage put to 3.7V and it considered that the power used up. Lithium battery discharge cannot put the no-load voltage below 3.7V; otherwise, excessive discharge will damage the battery. 4.2V is the highest limit voltage for battery charging. It considered that charging the lithium batteries no-load voltage to 4.2V considered full of electricity. During battery charging, the battery voltage gradually rises to 4.2V at 3.7V, and the lithium battery cannot charge. Charge the no-load voltage to 4.2V or higher, otherwise it will damage the battery. This is the special place for lithium batteries.

3. Use

The 18650-battery life theory is cyclic charging 1000 times. Due to the large capacity per unit density, it often used for most laptop batteries. In addition, because the stability of the 18650 is very good at work, it is widely used in various electronic fields: it often used in high-end glare flashlights. Portable power, wireless data transmitter, electric heating clothing, shoes, portable instrumentation, portable lighting equipment, portable printers, industrial instruments, instruments, etc. Qianjiang 48v40a lithium battery assembly

4. The difference

The 18650 means 18 mm in diameter and 65 mm in length. The model number of the No. 5 battery is 14,500, 14 mm in diameter and 50 mm in length. Generally, 18650 batteries used in the industry, and there are few civilians. The common ones used in laptop batteries and high-end flashlights.

The 18650 is just the size of the battery. It can divided according to the type of battery. 18650 for lithium ion, 18650 for lithium iron phosphate, 18650 for nickel hydrogen (rare), and the common 18650 is lithium ion.

5, charge and discharge charge and discharge principle The phone needs to slowly run out of electricity through a lower voltage. Under normal circumstances, if the mobile phone connected below the rated voltage of 3.6 volts, it will automatically shut down. After the battery discharged, the recharged mobile phone battery can used for a longer period. 18650-lithium battery repair method: one, take off all your batteries, use temperature treatment, the battery will be greatly unstable in the case of temperature instability Shorten the use time, because the battery is not charged and a considerable part of the lithium ion has charged with electricity. In this way, the memory can be released a part of it. When winter arrives, put it outside for a while, and then go to the house.

The working principle of lithium-ion battery refers to its charging and discharging principle. When the battery is charged, lithium ions generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte. The carbon as the negative electrode has a layered structure, and it has many microspores. The lithium ions reaching the negative electrode are embedded in the microspores of the carbon layer, and the more lithium ions are embedded, the higher the charging capacity.

For the same reason, when the battery is discharged (i.e., the process we use the battery), the lithium ions embedded in the carbon layer of the negative electrode come out and move back to the positive electrode. The more lithium ions return to the positive electrode, the higher the discharge capacity. What we usually call battery capacity refers to the discharge capacity.

It is not difficult to see that during the charging and discharging process of the lithium ion battery, the lithium ion is in a state of motion from the positive electrode to the negative electrode to the positive electrode. If we compare the lithium-ion battery to a rocking chair, the two ends of the rocking chair are the two poles of the battery, and the lithium ion is like an excellent sportsman, running back and forth at both ends of the rocking chair. Therefore, the experts gave the lithium-ion battery a cute name rocking chair battery. Qianjiang 48v40a lithium battery assembly

During the charging and discharging process, if the number of times of charging is increased, the thermal motion of the molecule will gradually destroy the internal molecular arrangement microstructure, and the storage charge efficiency will gradually decrease. "The process of freezing easily destroys the original internal structure of the battery, and may increase the capacity to charge the charge in a short period of time, but long-term use may not be effective."

Lithium battery charging control divided into two stages. First stage is constant current charging. When the battery voltage is lower than 4.2V, the charger will charge at a constant current. Second stage is constant voltage-charging phase. When battery voltage reaches 4.2V, due to characteristics of lithium battery, if voltage is high, it will damaged. The charger will fix the voltage at 4.2V, and charging current will gradually decrease. When it reduced to a certain value, (generally 1/10 set current), charging circuit cut off, the charging completion indicator lights up, and charging completed.

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