Lithium Battery 3.7V Lithium Polymer Battery 3.2V LifePo4 Battery 1.2V Ni-MH Battery Button Coin Battery
3.7V Battery Pack 7.4V Battery Pack 11.1V Battery Pack 14.8V Battery Pack Other Battery Pack
Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .
Environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery,3.7V lithium polymer battery, NiMH battery , NiCD battery ,Lead acid battery,dry cell battery ,alkaline battery ,heavy duty battery, button cell battery etc. we devote to R&D,innovation ,production & sales
Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc
Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc
Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.
release time:2024-03-09 Hits: Popular:AG11 battery
Nowadays, smartphones consume more and more power, and most smartphone batteries are not removable. A large-capacity and easy-to-carry mobile power supply has become a must-have electronic product for people to travel. However, the recent frequent safety incidents of mobile power supplies have forced consumers and engineers to re-examine the design and development of mobile power supplies. And how much do you know about the internal structure of mobile power supplies?
A mobile power supply usually consists of a casing, a battery cell and a circuit board. The shell is mainly used to encapsulate the product and achieve beautiful appearance, protection and other functions. It is commonly made of plastic and metal. Some well-known products often use plastic as a fireproof material. The circuit board is mainly used to implement voltage, current control, input and output control, and various other functions. Batteries are the most expensive component of mobile power supplies, and 18650 batteries and polymer batteries are the two most common. In addition to the battery core, the circuit board in the mobile power supply is also very important. For rechargeable batteries, the specifications include safe charging cut-off voltage and safe discharge cut-off voltage, as well as a calibrated rated maximum operating current. When designing a mobile power supply, the polymer battery must be charged safely first, because the cost of the battery is relatively high, and in order for the system to work safely and reliably, a charging management system is required. When a portable device needs to be charged, the polymer battery is discharged to the outside. Because the input voltage of portable devices is generally 5V, there is a 5V boost system. Whether it is a charging management system or a boosting system, it requires a circuit board to provide it. Therefore, the design of the internal circuit board of the mobile power supply determines whether the product is smart or not.
1. Overcharge protection
Lithium battery overcharge protection is implemented by using the power management chip to detect the voltage. The internal chip is in a baseline setting state (mobile phone lithium batteries are generally 3.5V). When the reference slowly rises, when it rises to the VSS-VDD design value, the voltage at this time is the protection overcharge shutdown voltage, and the external control circuit is controlled through a logic relationship to output a low or high level to achieve overcharge protection. When the voltage drops slowly, set the VSS-VDD voltage value to take the reference value. When the reference detects that it is below the setting, this is a logical relationship to release the overcharge protection.
2. Over-discharge protection
Over-discharge protection voltage refers to the lowest voltage that protects the battery during discharge transition. When the voltage reaches this voltage point, the protection circuit cuts off the circuit to protect the battery. According to the relationship between battery life and discharge depth, the relationship between battery voltage, discharge rate and discharge depth, combined with the actual load of the equipment, determine the battery discharge termination voltage and design the battery discharge protection circuit.
3. Short circuit protection
The loop current caused by a short circuit is generally more than 10 times the rated operating current, and overcurrent protection requires a delay of about tens of milliseconds. Dozens of times the rated current caused by a direct short circuit will also affect the performance of the battery pack within tens of milliseconds. Existing protection methods include the PPTC method, which cuts off the circuit thermally through current, which also requires millisecond-level response time and increases the impedance in the circuit. There are also short-circuit integrated chips dedicated to battery packs. This chip has a narrow application range and high cost.
4.PTC introduction
PTC positive temperature coefficient thermistor is also called a polyswitch, and a polymer resettable fuse is composed of a polymer matrix and carbon black particles that make it conductive. Because polymer resettable fuses are conductors, current will flow through them. When an overcurrent passes through a polymer resettable fuse, the heat generated (I2R) will cause it to expand. As a result, the carbon black particles will separate and the resistance of the polymer resettable fuse will increase. This will cause the polymer resettable fuse to generate heat faster and expand more, further increasing the resistance. When the temperature reaches 125°C, the resistance changes significantly, causing the current to decrease significantly. The small current flowing through the polymer resettable fuse at this time is enough to keep it at this temperature and in a high resistance state. When the fault is cleared, the polymer resettable fuse shrinks back to its original shape and reconnects the carbon black particles, thereby reducing resistance to a level with a specified holding current.
Read recommendations:
811 battery introduction.energy storage lithium battery manufacturer
What should I pay attention to when using lithium battery in RV
Last article:button cell battery cr1620.A brief discussion on the three contradictory relationships of power batt
Next article:button battery cr1620.Ladder utilization of power batteries? Let's study it further
Popular recommendation
solar energy battery storage system wholesale
2023-05-10cabinet type energy storage battery manufacturer
2023-05-10household energy storage lithium battery manufacturer
2023-05-10portable energy storage battery power supply maker
2023-05-101800mah 18650 battery
2023-03-22Snow board shoulder strap set
2022-09-22Oval bangs sticker
2022-09-22Lithium Battery GN6020
2022-08-19402030 180mAh 3.7V
2022-08-1914250 280MAH 3.7V
2022-10-156F22
2022-08-19Printed hair curler
2022-09-22Lithium Battery LQ-1220
2022-08-19Coin Battery CR 1620
2022-09-27521133 160mAh 3.7V
2022-07-0118650 battery pack Vendor
2023-06-25button battery cr2032
2023-06-2518650 battery pack direct sales
2023-06-253.7V Lithium Polymer Battery
2023-06-25803040 battery
2023-06-25General requirements for ship batteries
2024-08-08What are the advantages of lithium iron phosphate battery
2022-11-07What are the development prospects and trends of lithium batteries
2024-09-04powerwall lifepo4 battery for solar system.New breakthrough in ternary lithium batteries - magazine
2023-11-22Motor lithium battery.14250 battery
2023-05-24What is the difference between lead-acid battery and lithium battery
2022-11-08Why do some batteries add a protective board, some do not need?home solar energy storage lithium bat
2023-05-08What are the characteristics of power lithium batteries for ordinary lithium batteries.lithium lon b
2023-03-28What are the popular product advantages of large capacity lithium batteries!18650 battery 3500mah li
2023-08-26What are the maintenance notes for lithium -ion battery for a long time?36v 7.5ah lithium ion batter
2023-03-11