NiMH Battery News & Industry Insights

Internal Resistance and Impedance for NiMH Charge Control: From DC Pulses to Electrochemical Impedance Spectroscopy

2026-09-12

Measuring NiMH internal resistance during charge: DC current-interrupt and 100 ms hybrid pulses, the Randles EIS interpretation (ohmic, charge-transfer, Warburg), and how resistance trends inform current limits, termination and health.

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Estimating NiMH State of Charge Under Charge: Why Open-Circuit Voltage Fails and Coulomb Counting Must Be Anchored

2026-09-12

SOC estimation during NiMH charge: the flat OCV-SOC curve that defeats voltage lookup, coulomb counting and its drift, self-discharge and efficiency correction, and anchoring strategies for robust charge management.

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CC, CV or CC-CV? Why NiMH Charging Differs Fundamentally From Lithium-Ion

2026-09-12

Constant-current, constant-voltage and CC-CV regimes compared; why lithium uses CV taper to avoid plating while NiMH uses current-controlled charging with termination, what a NiMH 'voltage ceiling' really means, and cross-chemistry charger design implications.

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Reflex and Negative-Pulse Charging: Evidence, Mechanism and Limits for NiMH

2026-09-12

Reflex (burp) charging inserts brief discharge pulses between charge pulses; the claimed depolarisation and gas-burp mechanisms, what controlled studies actually show for NiMH, converter cost, and when negative pulses help versus add complexity.

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Pulse and Intermittent Charging: Opening the Recombination Window in NiMH Cells

2026-09-12

How pulse and intermittent charge profiles use rest intervals to relax concentration gradients, let oxygen recombine, lower peak pressure and temperature, and extend fast-charge headroom in NiMH, with duty-cycle and frequency design considerations.

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Fast-Charge Prerequisites: The Voltage and Thermal Gates That Must Open Before Current Rises

2026-09-12

Before fast NiMH charge is permitted, voltage and temperature qualification gates must pass: deep-discharge pre-charge, cold/hot NTC window, cell-count consistency, and the bq2002 fast-charge inhibit logic; a gate-by-gate design guide.

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How Charge Rate Governs NiMH Life: From 0.1C Overnight to Multi-C Fast Charge

2026-09-12

The rate-lifetime relationship in NiMH across 0.1C to multi-C: how current shifts oxygen onset, pressure and heat, the capacity-retention cost of sustained 1C, and the empirical basis for separating slow, standard and fast charge regimes.

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Integrating the Criteria: NiMH Charge-Management State Machines and Their Silicon Implementation

2026-09-12

How -delta-V, dT/dt, maximum voltage/temperature/time, top-off and pulse trickle are combined into one OR-logic state machine, using the TI bq2002 architecture as a worked silicon example, with pin-level and firmware design guidance.

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