Battery Manufactory

Different types of batteries have different internal resistances. For the same type of battery, due to the inconsistent internal chemical characteristics, the internal resistance is also different. The internal resistance of the battery is very small, we generally use milliohm units to mean it. Internal resistance is an important technical indicator to measure battery performance. Under normal circumstances, a battery with a small internal resistance has a strong high-current discharge capability, and a battery with a large internal resistance has a weak discharge capability. In terms of the schematic diagram of the discharge circuit, we can dissect the battery and the internal resistance and divide it into a power supply with no internal resistance connected in series with a small resistance. At this time, if the external load is light, then the voltage distributed on this small resistor is small, otherwise if the external load is very heavy, then the voltage distribu

Generally speaking, a good quality lithium battery has a protective device that will not explode, and a poor quality battery may explode. The overwhelming majority of 18650 lithium batteries are encapsulated in steel shells. Due to the lack of protection, over-charged batteries will suddenly increase their internal pressure and explode when they exceed the withstand value. Short circuit, excessive temperature or squeezing or even puncturing the battery may cause the battery to explode. There are many reasons for the explosion of the 18650 lithium-ion battery . The three main reasons are analyzed below. 1. Being over-charged The 18650 lithium battery is overcharged, which is a common cause of explosion. Lithium batteries must work within the specified voltage range, otherwise there will be hidden dangers of explosion and fire. For example, the ternary lithium battery is usually 2.5V ~ 4.2V; the lithium iron phosphate battery is usually 2.0V ~ 3.65V. When the 1

Parallel connection: Several batteries, the positive electrode and the positive electrode, the negative electrode and the negative electrode are connected together side by side, the voltage remains unchanged, the capacity increases, and the corresponding current also increases. Serial connection: Several batteries are connected in series, that is, the positive electrode and the negative electrode. The negative electrode of the first battery is connected to the positive electrode of the second battery, and so on. The voltage increases, the capacity does not change. In other words, if connected in series, the voltage of the battery pack is the sum of the voltages of the two batteries; if connected in parallel, the voltage they provide to the electrical appliances is as large as the voltage of only one battery. The difference between battery parallel connection and series connection is mainly the difference in voltage and capacity. Take a lithium battery with a

Generally, a 3.7V lithium battery needs an overcharge and overdischarge protection circuit board. If the battery does not have a protection board, it can only be charged with a voltage of about 4.2V, because the ideal full charge voltage of the lithium battery is 4.2V, and the voltage may be damaged if it exceeds 4.2V. The battery is charged by this method and the battery status needs to be monitored at all times. Lithium battery  with protection circuit board can be charged with 5V voltage(4.8V to 5.2V can be used). For 3.7V lithium batteries , the charge cut-off voltage is 4.2V and the discharge cut-off voltage is 3.0V. Therefore, when the open circuit voltage of the battery is lower than 3.6V, it can be charged. It is best to use 4.2V constant voltage charging mode, you can not pay attention to the charging time. Charging with 5V voltage is easy to cause danger of overcharging. The typical lithium battery cell is 3.7V, the voltage when fully charged is 4.2V, t

Lithium-ion batteries are the driving force of electronic products. If the battery consumption of electronic products is too large, the battery life of electronic products will be greatly reduced. Many users complain that the battery life of their electronic products is too short. If they are used for a long time, the battery life of the lithium-ion batteries of electronic products will be relatively weakened. The common problem of lithium-ion batteries in daily use is power loss. The more exhausted, the greater the battery loss. Why does the Why does the lithium ion battery capacity lose? Lithium-ion batteries start to wear out from the moment they leave the factory. This is due to the chemical nature of the lithium-ion battery , that is, the internal active material will continue to reduce its activity over time, and the part that gradually becomes no longer active will be lost The purpose of storing electrical energy. The reason for the attenuation of lithium ion

Influence of high temperature on lithium ion battery Among all environmental factors, temperature has the greatest influence on the battery's charge and discharge performance. The electrochemical reaction at the electrode / electrolyte interface is related to the ambient temperature. The temperature rise means that the output power of the lithium ion battery will rise. The temperature also affects the transfer speed of the electrolyte. The temperature rises faster, the transfer temperature decreases, and the transfer slows down. The battery charge and discharge performance will also be affected. However, if the temperature is too high above 45 ° C, the chemical balance in the battery will be destroyed, causing side reactions. The influence of temperature on the discharge performance directly reflects the discharge capacity and discharge voltage. As the temperature decreases, the internal resistance of the battery increases, the electrochemical reaction rate slo

Rechargeable Battery 1. Charging rate (C-rate) C is the first letter of Capacity, used to indicate the magnitude of the current when the battery is charged and discharged. For example, when the rated capacity of the rechargeable battery is 1100mAh, it means that the discharge time of 1100mAh (1C) can last for 1 hour. For example, the discharge time of 200mA (0.2C) can last for 5.5 hours. 2. Cut-off discharge voltage When the battery is discharged, the voltage drops to the lowest working voltage value at which the battery should not be discharged. According to different battery types and different discharge conditions, the requirements for battery capacity and life are also different, so the specified battery discharge termination voltage is also different. 3. Open circuit voltage (OCV) When the battery is not discharged, the potential difference between the two poles of the battery is called the open circuit voltage. The open circuit voltage of a batte