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:2022-12-30 Hits: Popular:AG11 battery
Inconsistencies in the performance of the electric core are formed in the production process and deepened in the use process. The electric cells in the same battery pack are always weak when they are weak, and become weak when they accelerate. The dispersion degree of parameters between individual electric cores increases with the deepening of aging degree.
At present, engineers should consider three aspects when dealing with the inconsistency of single electric core. Single battery sorting, thermal management after grouping, and the battery management system provides equalization function in case of a small amount of inconsistency.
1) Sorting
In theory, different batches of cells should not be used together. Even if the cells of the same batch are selected, the cells with relatively concentrated parameters should be placed in one battery pack and the same battery pack.
The purpose of sorting is to select the electric cores with similar parameters. Separation methods, which have been studied for many years, are mainly divided into static separation and dynamic separation.
Static sorting: screen the characteristic parameters such as open circuit voltage, internal resistance and capacity of the cell, select target parameters, introduce statistical algorithms, set screening criteria, and finally divide the cell of the same batch into several groups.
Dynamic screening is to screen the characteristics of the cell during the charging and discharging process. Some choose the constant current and constant voltage charging process, some choose the pulse impact charging and discharging process, and some compare the relationship between their own charging and discharging curves.
Dynamic and static sorting is combined. Static screening is used for preliminary grouping, and dynamic screening is carried out on this basis. In this way, more groups are divided, and the screening accuracy is higher, but the cost will rise accordingly.
This is a small demonstration of the importance of a power lithium battery production scale. Large scale shipment enables manufacturers to carry out more refined sorting and obtain battery packs with similar performance. If the output is too small and there are too many groups, a batch cannot be equipped with a battery pack, and no good method can be used.
2) Thermal management
Aiming at the problem that the internal resistance of the electric core is inconsistent and the heat generated is different. The thermal management system can adjust the temperature difference of the whole battery pack to keep it in a small range. The electric core that generates more heat still has a higher temperature rise, but it will not open a gap with other electric cores, so there will be no obvious difference in the deterioration level.
3) Equilibrium
Inconsistency of individual electric cores. The terminal voltage of some electric cores is always ahead of that of other electric cores and reaches the control threshold first, leading to the reduction of the entire system capacity. In order to solve this problem, the battery management system BMS has designed the equalization function.
A certain battery cell is the first to reach the charging cut-off voltage, while the voltage of the other battery cells lags behind significantly. The BMS starts the charging equalization function, or connects the resistor to discharge part of the power of the high voltage battery cell, or transfers the energy to the low voltage battery cell. In this way, the cut-off condition for charging is removed, the charging process starts again, and the battery pack is charged with more power.
Thermistors. Some electric cores are equipped with thermistors. Once over-current occurs, the resistance increases sharply after reaching a certain temperature, and the current in the circuit decreases, preventing the temperature from rising further.
Fuse and electric core are equipped with fuse with over-current fusing function. Once over-current risk occurs, the circuit will be disconnected to avoid malignant accidents.
Read recommendations:
18650 li ion rechargeable battery.18650 lithium-ion battery pack production process
Last article:Inconsistency analysis of single battery
Next article:Deeply understand the voltage of lithium ion battery
Popular recommendation
convenient energy storage power supply manufacture
2023-05-10601525 battery wholesaler
2023-03-2218650 battery pack Factory
2023-05-09household energy storage battery manufacture
2023-05-10convenient energy storage power supply
2023-03-22R03P
2023-02-18R03P
2023-03-27Lithium Battery GN12-50
2022-08-19Lithium Battery GN72100
2022-08-1918650 2600mAh 3.7V
2022-06-20Ni-MH AA600mAh 1.2V
2022-07-0118650 1800mAh 3.7V
2022-08-19801738 450mAh 3.7V
2022-08-19601848 500mAh 3.7V
2022-08-19Lithium-ion battery GN200 60000mAh
2022-08-193.7v 18650 lithium battery
2023-06-25batteries 9v
2023-06-25CR2320 battery
2023-06-25NiMH battery pack
2023-08-043500mah 18650 battery
2023-06-25What Are the Lithium Battery Certification Systems
2024-11-01Introduction to lithium battery
2022-11-28Optimization of Internal Resistance in Polymer Batteries
2025-06-07New Thin Film Cell Photovoltaic Module Design Technology
2024-01-24Graphite negative electrode for lithium batteries
2024-01-10Break through the energy density of the battery.wall-mounted energy storage battery wholesale
2023-04-20lithium ion battery manufacturers.portable energy storage battery power supply wholesale
2023-05-0618650 rechargeable battery lithium 3.7v 3500mah.Why 18650 lithium batteries can be widely used
2023-10-12Lithium battery negative material.rechargeable solar energy storage battery Vendor
2023-05-09Can lithium battery manufacturers help you understand how to use drone lithium batteries correctly?1
2023-08-18