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:2024-03-12 Hits: Popular:AG11 battery
In addition to their small size and light weight, lithium-ion batteries have a nominal voltage of up to 3.6 volts and a high energy density (meaning that fewer battery cells can be used to obtain the same output voltage). However, from the perspective of safety and to prevent battery performance degradation caused by excessive charging and discharging, it is necessary to install a subsystem (IC) that monitors the voltage and temperature of each battery cell in the battery pack.
I. Introduction
In recent years, with the development of various hybrid vehicles and electric vehicles, the performance requirements for on-board batteries have become increasingly higher. This is especially true for plug-in hybrid vehicles (PHEV) and electric vehicles (EV): compared with gasoline hybrid vehicles, they have higher requirements for battery capacity, while charging and discharging losses and self-discharge are required to be as small as possible. Therefore, the status of lithium-ion batteries is becoming more and more important.
Research reports show that in 2013, the global lithium-ion battery market size was 567 billion yen. By 2018, its scale increased by 163.8%, reaching 928.2 billion yen.
In addition to being small in size and light in weight, lithium-ion batteries have a nominal voltage (NominalVoltage) of up to 3.6 volts and a high energy density (meaning that fewer battery cells can be used to obtain the same output voltage). However, from the perspective of safety and to prevent battery performance degradation caused by excessive charging and discharging, it is necessary to install a subsystem (IC) that monitors the voltage and temperature of each battery cell in the battery pack. At the same time, considering that this subsystem may also fail, an independent parallel system is needed to detect the working status of the system.
2. Inherent problems of series battery packs
When the number of battery cells in a series battery pack increases from tens to hundreds, a problem in the series battery pack becomes prominent, which is the problem of cell balance.
Although lithium-ion batteries are industrially mass-produced products, under the current production environment, it is impossible for all battery units to have the same quality. For example, during the manufacturing process, changes in the tension when the battery cell electrodes are wound will affect the degradation rate of the battery cells. On the other hand, it is not required that all battery packs be used in the same environment when used. During use, battery units that are closer to the heat source deteriorate faster, while battery units that are farther from the heat source deteriorate more slowly.
The problem that arises from this is that each unit in the battery pack deteriorates at a different rate as the use time changes, resulting in a deviation in the capacity of the battery unit.
The overall performance of the battery pack also follows the "barrel principle (short board principle), that is, the capacity of the barrel depends on the shortest piece of all the wooden boards that make up the barrel, and the capacity of the battery pack also depends on the battery unit with the smallest capacity. During the charging process of the battery, once one of the battery cells reaches a fully charged state, the charger will stop charging. The same is true for the discharge process of the battery pack: when a certain battery unit is discharged, the entire battery pack will also Discharge will stop. As a result, the charging capacity of the entire battery pack decreases and the battery cannot fully utilize its capabilities.
Let's take a battery pack consisting of 3 battery cells as an example: Suppose one of the battery cells deteriorates faster. When this battery pack is discharged, the battery unit that deteriorates faster will finish discharging before the other two battery units. If discharge continues, the battery unit is in an over-discharge state. When lithium-ion batteries are over-discharged, they may emit smoke and catch fire. In order to prevent accidents, the discharge can only be stopped at this time, which means that the remaining power in the remaining two battery units cannot be used.
On the contrary, when the battery pack starts to charge, the two battery units that deteriorate more slowly are fully charged first; while the battery unit that deteriorates faster is not fully charged at this time. At this time, if charging is continued based on the battery unit that deteriorates faster, the two fully charged battery units that deteriorate more slowly will be in an overcharged state. Overcharging can also cause the battery to burn or explode. Similarly, in order to prevent accidents, the battery pack will end charging when the rapidly deteriorating battery cells are not fully charged.
Read recommendations:
How long is the three -yuan lithium battery life
Discussion on the new market of lithium iron phosphate battery
Last article:R03 Carbon battery.What is the core technology of electric vehicle power battery BMS?
Next article:NiMH No.7 battery.Effect of graphite anode on fast charging performance of lithium-ion batteries
Popular recommendation
801520 battery Manufacturing
2023-03-2216340 battery wholesaler
2023-03-22601248 polymer battery company
2023-03-22portable energy storage battery power supply Product
2023-05-103.2v 100ah lifepo4 battery cell
2023-03-22Coin Battery LR 44
2022-10-15Bluetooth headset
2022-07-22Home energy storage battery FBC-HS02
2022-11-08Coin Cell BR 1632
2022-10-15703048 1100MAH 3.7V
2023-06-1026650 5000MAH 3.7V
2022-10-15LR03
2022-07-23Coin Battery CR 1216
2022-09-27501825 180MAH 3.7V
2023-06-12Alkaline C Battery LR14
2022-11-1118650 3500mah battery
2023-06-25LR521 battery
2023-06-25NiMH battery packs
2023-06-25402030 battery
2023-06-25lithium 18650 li ion battery
2023-06-25The reasons for the short lifespan of lithium batteries
2024-01-26Ternary Lithium Rechargeable Batteries
2024-12-19The battery tells you the characteristics of ternary lithium batteries
2024-05-13Selection of Single - Use Lithium Batteries
2025-04-163.2v 20ah lifepo4 battery.The principle of charging and discharging of lithium iron phosphate batter
2023-12-0418650 Battery Pack Applications
2022-12-13What are the differences between energy storage lithium batteries and power lithium batteries.cabine
2023-05-11What is the difference between explosion -proof lithium batteries and ordinary lithium batteries.lit
2023-03-28Lithium iron phosphate battery new shopping mall breakthroughs -power grid energy storage burst
2023-02-23Why do customized lithium batteries come with protective plates?
2023-08-01