The Hybrid Power Pack as a Platform: Balancing, Protection and Multi-Source Charging. A Claim-by-Claim Engineering Analysis of US 10,523,019 B2

Background. A companion paper showed that pairing a battery with a supercapacitor can cut battery Joule heating by up to 1 − 1/FF² in the ideal case, where FF is the form factor (rms ÷ mean) of the load current, and identified engine cranking as the lead application. That paper analysed the independent claim of the Hybrid Power Pack (HPP) patent. The granted United States patent, however, carries 20 claims, and its dependent claims and second independent claim add functions that turn a two-store circuit into a platform: cell and capacitor balancing, deep-discharge protection, integration in silicon, and five charging inputs. Approach. This paper takes every claim of US 10,523,019 B2 in turn, identifies the engineering function it adds, and quantifies that function from first principles and the peer-reviewed literature. Every number is computed from stated assumptions or taken from a cited source, and each is labelled as one or the other. Results. Balancing is what lets a series pack use all of its rating. In a six-cell supercapacitor string charged to 16.2 V, one cell with a 5 % capacitance shortfall rises to 2.82 V, 4.3 % above its 2.7 V rating; holding every cell within rating without balancing leaves 91.8 % of the string's energy usable, falling to 69.0 % at a 20 % shortfall, and capacitor balancing recovers the full rating. In a series battery, a state-of-charge offset between cells removes the same fraction of usable capacity. The state-of-charge disconnect of claim 19 removes both stores from the load at a set end-of-charge value, which can be placed above the deep over-discharge region in which copper deposition and internal short circuit have been observed in lithium-ion cells. The five charging inputs span six orders of magnitude: a 100 W mains charger refills a 1.40–2.06 Wh cranking buffer in 50–74 s, a 10 W solar panel in 8–12 min, and a current-transformer harvester clamped on a 10 A line (283 mW) in 4.9–7.3 h, while coil, radio-frequency and airflow harvesters deliver microwatts to milliwatts, well matched to keep-alive supply of the monitoring electronics. Applied to other sectors, the division of labour gives an ideal reduction in battery Joule heat of 86–93 % for a rail peak-shaving duty and 90 % for one-minute photovoltaic smoothing events. Conclusions. Read as a whole, the claim set describes a complete, self-managing DC power platform: two complementary stores, each kept in balance, protected against deep discharge, supervised from one controller that can be integrated on an application-specific integrated circuit, and refilled from whichever energy source is at hand. A test programme is defined to convert each derived figure into a measured one. Preprint, not peer reviewed. Companion to: Rohera HK, Two Stores, One Power Pack (doi:10.5281/zenodo.22958077). Patent status for each jurisdiction is stated in Section 10 of the paper.