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:2024-04-10 Hits: Popular:AG11 battery
Parameters and characteristics analysis and balance management of automobile power battery packs
Power batteries are considered to be the future of electric vehicles. Electric vehicles are a combination of three major technologies: electric source, motor and vehicle. The electric source is the core component of electric vehicles. There has been an upsurge in the development of power lithium-ion batteries and their special materials. Do As a new type of power technology, lithium batteries must be connected in series to meet the required voltage. The uneven performance of individual cells is not entirely due to battery production technology problems. There are many processes from coating to finished product. Even if each process goes through strict testing procedures to make the voltage, internal resistance, and capacity of each battery consistent, differences will occur after a period of use, making the technical problems of the use of lithium power batteries urgent, and must be done as soon as possible solve.
The service life of the power battery pack is affected by many factors. If the life of the battery pack is less than half of the average life of the battery pack, it can be inferred that it is due to improper use of technology. The primary reason is overcharging and over-discharging of the single battery. Premature failure. This article combines the characteristics of lithium power batteries, electronic power supplies, and computer control technology to study the use technology of power battery packs and explores the balance control and management of power battery packs.
Main performance parameters of power battery
1 voltage
Open circuit voltage = electromotive force + electrode overpotential, operating voltage = open circuit voltage + voltage drop caused by current on the internal impedance of the battery. Electromotive force is determined by the material characteristics of the electrode and electrolyte, and the overpotential of the electrode is related to material activity, state of charge and working conditions. .Metal lithium standard electrode potential -3.05V, 3V lithium battery 3.3~2.3V, 4V lithium 4.2~3.7V, 5V lithium 4.9V~3.0V
2 internal resistance
The steady-state model of the battery in a short period of time can be regarded as a voltage source, and its internal impedance is equivalent to the internal resistance of the voltage source. The size of the internal resistance determines the efficiency of the battery. The internal resistance of the battery includes two parts: ohmic resistance and polarization resistance. The resistance does not change with the frequency of the excitation signal, also known as AC resistance. During the same charge and discharge cycle, the ohmic resistance changes very little except for the influence of temperature rise. The polarization resistance is generated by the resistance reaction of the battery's electrochemical characteristics to external charge and discharge, and is related to Battery charge, charging and discharging intensity, and material activity are all related. For the same batch of batteries, if the internal resistance is too large or too small, it is abnormal. If the internal resistance is too small, it may mean material dendrite growth and micro short circuit. If the internal resistance is too large, it may be Plate aging, active material loss, capacity attenuation, and internal resistance changes can be used as one of the adequacy references for battery cracking.
3 temperature rise
The battery temperature rise is defined as the difference between the internal temperature of the battery and the ambient temperature. Most lithium batteries have an endothermic reaction when charging and an exothermic reaction when discharging. Both include internal resistance heat consumption. In the early stage of charging, the polarization resistance is the smallest and the absorption resistance is the smallest. Thermal reaction is dominant, and the battery temperature rise may be negative. In the later stage of charging, the impedance increases, releasing more heat than absorbing heat, and the temperature rise increases. During overcharging, with the emergence of irreversible reactions, gas escapes, internal pressure, and temperature Rise and rise until it deforms and bursts.
4Internal pressure
The internal pressure of the battery increases due to the gas escaping from the internal reaction of the battery. Excessive pressure will burst the shell and cause explosion. Based on safety considerations, on the one hand, lithium batteries are designed with one-way explosion-proof valves. On the other hand, they are made of plastic shells. .The gas evolution reaction is often accompanied by an irreversible reaction, which means the loss of active materials and the decrease in battery capacity. No gas evolution and small temperature rise charge and discharge are the most ideal.
5 power
In electricity, electricity is expressed in Wh, which is a unit of energy. One kilowatt hour is equal to 1kWh. Batteries often use Ah to calculate electricity. For power batteries, the focus is on power and energy. Wh is more direct, because the voltage of the battery changes, and it changes throughout the process. The amount can reach about half of the maximum value. Calculating the amount of electricity using Ah cannot accurately describe the power driving capability of the battery. However, Ah as the unit of electricity for the battery has its own history and reason. Both units of electricity can be used where there is no ambiguity.
Read recommendations:
Common problems with lithium batteries and processing methods.602030 polymer battery
What is the capacity of a 18650 lithium battery?16340 battery
Last article:9v alkaline battery
Next article:button battery 2025
Popular recommendation
14500 battery manufacture
2023-03-223.20V Lithium Polymer Battery maker
2023-03-22NiMH battery packs direct sales
2023-03-22801538 battery Manufacturing
2023-03-22522749 battery sales
2023-03-22603450 1200MAH 3.7V
2023-06-10Coin Battery CR 1212
2022-09-27Coin Battery LR 1121
2022-10-15R14
2022-07-01Colorful T style strap
2022-09-22Coin Battery CR 1620
2022-09-27LR61
2022-11-22L1325 4LR44
2022-10-09801752 720MAH 3.7V
2023-06-10Business laptop bag
2022-09-2218650 lithium-ion battery
2023-06-2518650 li-ion battery
2023-06-25CR1625 battery
2023-06-2527A battery
2023-06-25button cell battery cr2025
2023-06-25The Challenge of Rechargeable Batteries
2022-11-14What Materials are Used in Lithium Batteries?
2024-11-08How does lithium polymer battery perform under extreme temperature conditions?
2024-09-10Methods to extend the service life of lithium batteries
2024-03-21Advantages of polymer lithium batteries
2024-09-25Principles of ion battery principle.3.7v 3000mah 18650 battery
2023-07-18Advantages of power batteries.4LR44 battery
2023-08-22Domestic power lithium ion battery standard
2022-12-28Charging performance of Lithium iron phosphate lithium battery.solar energy storage system battery g
2023-10-07The reflection of the actual application of high magnification.1800mah 18650 battery
2023-05-18