Nickel-metal hydride battery
Nickel-metal hydride battery: A NiMH cell is in the ~1.2 V nominal class; pack voltage increases with series cell/module count. The page also includes a worked example and measurement sequence.
Technical frame
Nickel-metal hydride battery: A NiMH cell is in the ~1.2 V nominal class; pack voltage increases with series cell/module count. The page also includes a worked example and measurement sequence.
The technical values here expose the standard, protocol or physical relationship directly; model-specific service values are linked through the matching model/variant dossier.
The goal is not only to define the term but to let the reader calculate and interpret what the data means in a scan, scope or physical test.
Concrete technical facts
- A NiMH cell is in the ~1.2 V nominal class; pack voltage increases with series cell/module count.
- Near full charge, NiMH behavior can be monitored through temperature rise and voltage response, while exact BMS algorithms are manufacturer-specific.
- Under load, voltage delta among hybrid-pack blocks can reveal a weak module better than unloaded voltage.
- Internal resistance can be estimated approximately from ΔV/ΔI during a current step.
- A dirty cooling fan/duct can increase temperature spread and cause power limitation.
- SOC, capacity and power capability are different concepts; high SOC does not exclude poor SOH.
Worked example
- Internal-resistance example: if a 20 A load step drops block voltage by 0.30 V, R≈ΔV/ΔI=0.30/20=0.015 Ω, or 15 mΩ.
Measurement and verification sequence
- Record block voltages during the same load step.
- Observe min/max temperature and fan command/current.
- Compare block internal-resistance trend using ΔV/ΔI.
- Verify whether voltage delta recovers after charge/discharge.
Fault-separation logic
- Is a valid command present and are power/ground/network healthy?
- Does feedback follow the command?
- Does an independent physical measurement confirm the output?
- Is the fault limited to a specific temperature/load/speed condition?
- Does the result remain stable when the original condition is repeated after repair?
Technical sources
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