Battery Manufactory

There are two reasons for the excessive self-discharge of lithium-ion batteries : physical micro short-circuit and chemical reaction. 1. Physical micro short circuit There are many situations that cause physical micro short circuits, which are divided into the following categories: a. dust and burrs Many manufacturers’ self-discharged batteries will find black spots on the diaphragm when they are disassembled. The middle position is the majority of dust breakdown, and the edge position is the majority of burrs. This is easier to distinguish; b. Positive materials metal impurities Why should this be classified into this category? In fact, the metal impurities in the positive electrode will also break through the separator after the charging reaction, forming black spots on the separator, and causing physical micro-short circuits; for example, many positive electrode lithium iron materials will face The problem of excessive self-discharge is caused by excessive iron impuriti...

The protection function of lithium-ion battery is usually completed by the protection circuit board and current devices such as PTC. The protection board is composed of electronic circuits, which can accurately monitor the voltage of the battery cell and the charging and discharging circuit under the environment of -40℃ to +85℃. It can control the on-off of the current loop in time; PTC prevents the battery from being damaged badly in a high temperature environment. Ordinary 18650 lithium ion battery protection board usually includes control IC, MOS switch, resistor, capacitor and auxiliary devices FUSE, PTC, NTC, ID, memory, etc. Among them, the control IC controls the MOS switch to turn on under all normal conditions to make the cell and the external circuit conduct. When the cell voltage or loop current exceeds the specified value, it immediately controls the MOS switch to turn off to protect the cell's Safety. When the lithium-ion battery protection board is n...

1. Material Lithium ion batteries use liquid electrolytes, while polymer lithium batteries use gel electrolytes and solid electrolytes. In fact, a polymer battery cannot really be called a polymer lithium battery. It cannot be a real solid state. It is more accurate to call it a battery without flowable liquid. 2. Packaging method and appearance The polymer lithium battery is encapsulated with aluminum-plastic film, and the shape can be customized at will, thick or thin, large or small. Lithium-ion batteries are packaged in a steel case, and the most common shape is cylindrical, the most common is 18650, which refers to 18mm in diameter and 65mm in height. The shape is fixed. Can't change at will. 3. Security There is no flowing liquid inside the polymer battery, and it will not leak. When the internal temperature is high, the aluminum-plastic film shell is just flatulence or bulging and will not explode. The safety is higher than that of lithium-ion batteries. Of c...

1. Types of rechargeable batteries Nickel-cadmium battery (Ni-Cd) Voltage: 1.2V Service life: 500 times Discharge temperature: -20 degrees to 60 degrees The charging temperature is: 0 degrees to 45 degrees Remarks: Strong overcharge resistance. Ni-MH battery (Ni-MH) Voltage: 1.2V Service life: 1000 times The discharge temperature is: -10 degrees to 45 degrees The charging temperature is: 10 degrees to 45 degrees Remarks: The current maximum capacity is about 2100mAh. Lithium ion battery (Li-lon) Voltage: 3.6V Service life: 500 times Discharge temperature: -20 degrees to 60 degrees The charging temperature is: 0 degrees to 45 degrees Remarks: The weight is 30%-40% lighter than Ni-MH batteries, and the capacity is more than 60% higher than Ni-MH batteries. But it is not resistant to overcharging, if overcharging will cause the temperature to be too high and destroy the structure => explosion. Li-polymer battery (Li-polymer) Voltage: 3.7V Service life: 500 times Discharge temp...