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:2024-05-10 Hits: Popular:AG11 battery
What are the failure modes of 18650 lithium battery cells and what should we pay attention to?
When using 18650 lithium battery cells, attention should be paid to issues such as connecting wires, battery parameters, and electrolyte density; the failure modes of 18650 lithium battery cells include corrosion deformation of the positive plate, shedding of the active material of the positive plate, softening, and irreversible sulfation, as follows. Let’s introduce it in detail.
1. Precautions for using and maintaining 18650 lithium battery cells
1. The wiring should be correct and the connection should be firm. In order to prevent the battery from being damaged if the wrench is grounded, the negative pole should be connected first during installation, then the connecting wire between the two batteries, and finally the ground wire. When removing the battery, proceed in reverse order.
2. Check the battery parameters once a week. The electrolyte level should always be 10-15mm higher than the plate. If you find that the electrolyte level has dropped, add distilled water in time. Do not expose the electrolyte to the liquid level, otherwise the plate will be damaged. When the electrolyte is insufficient, only distilled water can be added. It is strictly prohibited to use river water, well water, or tap water. It is strictly prohibited to add concentrated sulfuric acid, otherwise the battery will be damaged due to excessive electrolyte density.
3. The electrolyte density should be adjusted in time according to regional and temperature changes. In areas with higher temperatures, electrolytes with lower density should be used; in colder areas, the density of the electrolyte should be higher to prevent freezing.
4. Always observe whether the battery shell is cracked, whether the installation is firm, and whether the wiring is tight. Timely remove dirt and oil stains on the battery surface, wipe off the electrolyte on the battery cover, remove the oxide layer on the pole posts and wire connectors, and keep the battery surface clean and dry. If the surface of the battery is too dirty, it will cause slow discharge between the electrodes and damage the battery. The battery poles should be protected by applying petroleum jelly to prevent oxidation and rust. The filling hole cap should be tightened and the vent hole on the cap should be unclogged.
5. When the voltage of a single battery is lower than 1.8V or the density of the electrolyte is lower than 1.15g/cm3, do not continue to use it and charge it in time. Each charge must be sufficient to prevent undercharging. During use, you should try to increase charging opportunities as much as possible, and always keep the battery working with sufficient power. A fully discharged battery should be charged within 24 hours.
2. Failure modes of 18650 lithium battery cells
1. Corrosion deformation of positive plate
There are three types of alloys currently used in production: traditional lead-antimony alloys, with an antimony content of 4% to 7% by mass; low antimony or ultra-low antimony alloys, with an antimony content of 2% by mass or less than 1% by mass. The lead-calcium series is actually a lead-calcium-tin-aluminum quaternary alloy with a calcium content of 0.06% to 0.1% mass fraction. The positive electrode grid made of the above alloy will be oxidized into lead sulfate and lead dioxide during the battery charging process, which will eventually lead to the loss of the role of supporting active materials and cause the battery to fail; or due to the formation of a lead dioxide corrosion layer, the lead The alloy generates stress, causing the grid to grow and deform. When this deformation exceeds 4%, the entire plate will be damaged. The active material will fall off due to poor contact with the grid, or short circuit at the busbar.
2. The active material of the positive plate falls off and softens
In addition to the shedding of active materials caused by the growth of the grid, as the charge and discharge are repeated, the bonds between the lead dioxide particles also relax, soften, and fall off from the grid. A series of factors such as the manufacturing of the grid, the tightness of the assembly, and the charging and discharging conditions all have an impact on the softening and shedding of the positive plate active material.
3. Irreversible sulfation
When a battery is overdischarged and stored in a discharged state for a long time, the negative electrode will form a coarse lead sulfate crystal that is difficult to accept charging. This phenomenon is called irreversible sulfation. Slight irreversible sulfation can still be restored by some methods. In severe cases, the electrode will fail and cannot be charged.
4. Premature loss of capacity
When low antimony or lead-calcium is used as a grid alloy, a sudden decrease in capacity will occur in the early stages of battery use (about 20 cycles), causing the battery to fail.
5. Severe accumulation of antimony on active substances
The antimony on the positive electrode grid is partially transferred to the surface of the active material of the negative electrode plate with the circulation. Since the overpotential of H+ reduction on antimony is about 200mV lower than that on lead, the charging voltage decreases when antimony accumulates. Part of the current is used for water decomposition, and the battery cannot be charged properly and therefore fails. The antimony content of the negative active material of the lead-acid battery that failed when the charging voltage was only 2.30V was tested. It was found that the antimony content in the surface layer of the negative active material reached 0.12% to 0.19% mass fraction. For some batteries, such as submarine batteries, there are certain restrictions on the hydrogen evolution efficiency of the battery. The negative active materials of batteries whose hydrogen evolution exceeded the standard were tested and the average antimony content reached 0.4% mass fraction.
6. Thermal failure
For low-maintenance batteries, the charging voltage is required not to exceed a single cell of 2.4V. In actual use, such as in a car, the voltage regulating device may be out of control, the charging voltage is too high, and the charging current is too large. The heat generated will increase the temperature of the battery electrolyte, causing the battery's internal resistance to drop; the drop in internal resistance will also The charging current is enhanced. The temperature rise and excessive current of the battery reinforce each other and eventually become uncontrollable, causing the battery to deform, crack and fail. Although thermal runaway is not a common failure mode for 18650 lithium battery cells, it is not uncommon. When using, attention should be paid to the phenomenon that the charging voltage is too high and the battery is hot.
7. Corrosion of negative electrode bus
Under normal circumstances, there is no corrosion problem on the negative electrode grid and bus bar. However, in a valve-regulated sealed battery, when the oxygen cycle is established, the upper space of the battery is basically filled with oxygen, and the bus bar is more or less the electrolyte in the diaphragm along the electrode. Climb up the ear to the busbar. The alloy of the bus bar will be oxidized and further form lead sulfate. If the alloy of the bus bar electrode is not selected properly, the bus bar will have slag inclusions and gaps. The corrosion will deepen along these gaps, causing the tabs to separate from the bus bar and the negative plate to fail.
8. Perforation of the diaphragm causes short circuit
Some types of separators, such as PP (polypropylene) separators, have larger pore sizes, and the PP fuse will be displaced during use, resulting in large pores. Active materials can pass through the large pores during charging and discharging, causing micro short circuits. , causing the battery to fail.
The above are the failure modes and precautions of 18650 lithium battery cells. If you have any questions, please feel free to contact us.
Read recommendations:
When should we start charging in normal use.702535 lipo battery
Advantages of lithium iron phosphate battery
Last article:18650 lithium battery 3.7 v
Next article:3.7V Lithium Polymer Battery
Popular recommendation
Ni-MH batteries Vendor
2023-03-2218650 lithium ion battery cell
2023-03-22601848 battery Manufacturing
2023-03-22601435 polymer battery company
2023-03-22801620 polymer battery company
2023-03-2218500 1000MAH 3.7V
2022-10-15LR03
2022-08-19LR14
2022-07-01Electric vehicle lithium battery GN-24100-FAP
2022-09-27Li-ion 32700 6000mAh 3.2V
2022-06-203.2V 280Ah
2022-10-126F22
2022-12-0118650 2200mAh 14.8V
2022-09-30Lithium Battery GN72100
2022-08-19Lithium-ion battery GN200 222wh
2022-08-2318650 battery 2500mah
2023-06-25AA Ni-MH batteries
2023-06-25LR41 battery
2023-06-251.5v Carbon battery
2023-06-2518650 battery pack price
2023-06-25Lithium battery terminology, parameters, design and selection details
2024-03-28Separation capacity of lithium batteries.CR2032 button cell battery
2023-09-15The main function of lithium battery protection board
2023-10-07Cylindrical lithium battery cell
2022-12-023.2v 20ah lifepo4 battery.The principle of charging and discharging of lithium iron phosphate batter
2023-12-04High performance lithium-ion cathode materials.18650 battery 2600mah
2023-08-07Lithium battery sharing three major core functions of BMS
2023-02-07Lithium Power Battery Science Research.CR2032 button cell battery
2023-07-12Application of UPS in Uninterruptible Power Supply.18650 rechargeable battery lithium 3.7v 3500mah
2023-08-24Battery model.lithium 3400mah 3.7v 18650 battery
2023-07-07