Method for calculating power capability of battery packs...

Details Method for calculating power capability of battery packs... Method for calculating power capability of battery packs...

2007-12-21

2010-02-02

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S127000, C320S137000, C320S149000

Reexamination Certificate

active

07656122

ABSTRACT:
The present invention relates to a method and an apparatus for estimating discharge and charge power of battery applications, including battery packs used in Hybrid Electric Vehicles (HEV) and Electric Vehicles (EV). One charge/discharge power estimating method incorporates voltage, state-of-charge (SOC), power, and current design constraints and works for a user-specified prediction time horizon Δt. At least two cell models are used in calculating maximum charge/discharge power based on voltage limits. The first is a simple cell model that uses a Taylor-series expansion to linearize the equation involved. The second is a more complex and accurate model that models cell dynamics in discrete-time state-space form. The cell model can incorporate a inputs such as temperature, resistance, capacity, etc. One advantage of using model-based approach is that the same model may be used in both Kalman-filtering to produce the SOC and the estimation of maximum charge/discharge current based on voltage limits.

REFERENCES:
patent: 5658682 (1997-08-01), Usuda et al.
patent: 7109685 (2006-09-01), Tate et al.
patent: 2004/0000892 (2004-01-01), Jae-Seung

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