Magnetic sensor transformer for determining state of charge for iron phosphate lithium ion batteries

摘要

A magnetic sensor for measuring the magnetic properties of a battery cell, and converting the magnetic properties to a battery cell SOC. The magnetic sensor includes a magnetic core formed of laminated high permeability plates provided in a C-shape. An extended portion of the battery cell extends through a transverse opening in the core so that it is positioned within the core. A driving coil is wrapped around one end of the magnetic core and generates a magnetic field in the core that extends across the transverse opening and through the battery cell. A receiving coil is wrapped around an opposite end of the core that receives the magnetic field, and converts the magnetic field to a representative current. A detection circuit converts the receiving coil current to the battery cell SOC.

主权项

1. A magnetic sensor assembly for determining state-of-charge of a battery cell, said sensor assembly comprising:
a magnetic core including a C-shape loop of material, said core having two opposing end portions and two opposing side portions defining a central opening, said magnetic core further including a transverse opening through one of the side portions, said transverse opening accepting a portion of the battery cell extending therethrough so that the portion of the battery cell is positioned within the central opening; a driving coil wrapped around one of the end portions and being responsive to a driving signal that generates a magnetic field in the core that extends across the transverse opening and the portion of the battery cell; a receiving coil wrapped around the other end portion where the magnetic field in the core induces a current flow in the receiving coil; and a processor responsive to the current flow from the receiving coil, said processor being configured to convert the current flow in the receiving coil to a proportional magnetic signal indicative of the field strength of the magnetic field in the core and converting the magnetic signal to the state-of-charge of the battery cell.