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:
Disadvantages of zinc air battery
18650 lithium battery is the best companion for outdoor exploration
Last article:9v alkaline battery
Next article:button battery 2025
Popular recommendation
solar energy battery storage system manufacturer
2023-05-10601525 battery Vendor
2023-03-22AA Ni-MH battery
2023-03-22502030 polymer battery
2023-03-2218650 battery flat top
2023-03-22521133 160MAH 3.7V
2023-06-126F22
2022-07-04Coin Battery CR 2477
2022-09-2718650 2000mAh 3.7V
2022-06-20701221 120mAh 3.7V
2022-07-01Ni-MH AAA400mAh 1.2V
2022-07-01R20
2022-12-01603450 1200mAh 3.7V
2022-08-19Coin Battery LR 921
2022-10-15401030 90MAH 3.7V
2023-06-123.7v battery 18650
2023-06-25803040 battery
2023-06-253.7v 2200mah 18650 lithium battery
2023-06-25button battery cr1620
2023-06-25102450 lipo battery
2023-06-25Lithium Thionyl Chloride Primary Battery State - of - Charge Detection
2025-04-22How to reduce fuel power lithium batteries to reduce platinum metal dosage
2023-02-2212V23A battery.Usage of lithium silicate batteries
2023-12-18Energy density issues of new energy vehicle power batteries.18650 lithium battery cells
2023-09-22Model and specification of cylindrical lithium battery
2022-12-0518650 battery 3500mah lithium.Which is better, polymer lithium battery or 18650 lithium battery?
2023-10-13Extend the service life of multi -core batteries.802540 lipo battery
2023-05-23What are some points to pay attention to when purchasing explosion-proof lithium batteries.18650 bat
2023-09-05Which is the best of lithium iron phosphate batteries and lithium titanate batteries
2023-02-248V lithium ion battery charger
2022-12-06