Fórum | MyPower.CZ | Obnovitelné zdroje energie - energetická soběstačnost | Poslední návštěva: úte led 26, 2021 12:23 am
When charging at above-freezing temperatures, the lithium ions inside the battery are soaked up as in a sponge by the porous graphite that makes up the anode, the negative terminal of the battery. Below freezing, however, the lithium ions aren’t efficiently captured by the anode. Instead, many lithium ions coat the surface of the anode, a process called lithium plating, which means there’s less lithium available to cause the flow of electricity and the battery’s capacity drops. Charging below 0°C at an inappropriate charge rate, also causes the battery to become less mechanically stable and more prone to sudden failure.
The damage to the battery when charging at colder temperatures is proportional to the charging rate. Charging at a much slower rate can reduce the damage, but this is rarely a practical solution. In most cases, if a lithium-ion battery is charged below freezing even once, it will be permanently damaged and must be safely discarded or recycled.
In below-freezing conditions, without a BMS communicating to a charger that is programmed to reduce current when necessary, the only solution has been to heat the batteries to above freezing before charging, either by bringing them into a warmer environment or by wrapping them in a thermal blanket or placing a small heater near the batteries, ideally with a thermometer to monitor the temperature during charging. It’s not the most convenient process.
marsal64 píše:......
- v hraničních mizerijních podmínkách, jako jsou dneska, je MPPT (Stř.Z) prostě lepší než PWM (Stř.V). A takhle vypadá vývoj od idejí do praxe: mám dva Axperty, jeden z nich funguje už jen jako MPPT regulátor, uvažuji, že ten druhý (momentálně měnič + PWM) budu používat jen jako měnič a pro podobné situace jako dnes koupím ještě jeden MakeSkyBlue...
vlkazajac píše:Málo ? Obávam sa, že skôr veľa. Ale je to pri slabých osvitoch, mýliť sa môžem.
vlkazajac píše:To je predsa akurát ! Don't worry !
Ale už tam nič netečie, pre dnešok sme to zmeškali. Skús zajtra cez deň.
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