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mätning av batteri spänning under laddning?

Postat: 20 november 2010, 23:22:05
av lizerdboy
Jag bygger nu en laddare till batterier och försöker anpassa denna till AGM batterier och sekvens laddning som beskrivs nedan.

Frågan är: spänningen som anges för varje sekvens, är det den spänningen som mäts när laddningen är på eller av?
Om denna spänning mäts under laddningen eller när laddströmmen är från kopplad "enbart batterispänningen"??

med ladd ström menar jag det första steget i ladd sekvensen är CC = constant current.


Min laddare läser ut både spänningen när ladd strömmen är på och av.
alltså spänningen under laddning och när ladd strömmen är frånkopplad.
Detta görs med jämna mellanrum hela tiden under laddningen.

Sekvensen som jag har byggt in nu är bara första steget i sekvensen som anges nedan.
i videon så har jag satt slut spänningen "batterispänningen" till 14.0v och strömmen till 0.8A,
Ökar jag strömmen så går ladd spänningen i 15-16 volt vilket inte är så bra.

Film http://www.youtube.com/watch?v=8CYgQvPDdKc

Någon som vet vad som gäller ??

Bild
Bild



AGM Battery Charging

The first stage in a 3 or 4 stage charging algorithm is the “Bulk Stage”. Typically the Bulk Stage is a “Constant Current” (CC) charge but may also be Constant Power, Pulse Current or Taper Charge. In this stage the optimum charge current should be limited to less than or equal to 30 amps per 100 ampere hour (20 hour rate) of battery capacity or .3C. This stage should end when the cell voltage is = to 2.4-2.45V/Cell at 25˚C/77˚F. The maximum time in hours should = 1.2 times the DOD (in AH) divided by the average charge current in amps. If this time is exceeded, charging should be stopped and the battery and/or charge process should be analyzed. This stage will represent approximately 60% of the total charge time. The battery will be nearing 80%-90% charged at the end of this stage.

The second stage is the “Absorption Stage”. Typically this stage is a Constant Voltage (CV) stage where the terminal voltage is maintained at 2.4-2.45V/Cell at 25˚C/77˚F (adjusting for temperature). The charge current is maintained until current acceptance drops by less than .1 ampere over a 1 hour period. This stage should take the battery to 100% charged and should not take longer than 10-12 hours. If this time is exceeded, charging should be stopped and the battery and/or charge process should be analyzed.

The third stage is the “Float Stage” or maintenance and monitor stage. This step is generally not needed if; no load is present when the batteries device is not in operation; the batteries device is used on a regular basis and does not sit idle for lengthy periods of time. Float voltage should be maintained at 2.25-2.30 V/Cell.

If a “Balance Mode” is included in the charging algorithm it would typically happen after the “Absorption Stage”. This would become the third stage and the “Float Stage” would then become the fourth stage. A balance mode is similar to an Equalize function for flooded batteries but is performed against tightly controlled current, voltage and time. For example the current should be limited to 1 amp per 100 amp hour of battery capacity and the battery should not be maintained at more than 2.6V/Cell for longer than 4 hours. Most standard quality non-traction (heavy duty deep cycle) AGM type batteries should not be exposed to equalization or a balance charge. Higher quality Dry Cell Traction type batteries will require a higher voltage finish or balance charge to perform to their best ability. Do not compare a standard AGM, Advanced AGM or standard cyclic AGM battery charge profile with true traction type battery profiles.