Method of connecting cell voltage sensors
AssigneeAtieva, Inc.
InventorsRichard J. Biskup, Sam Chang
Life of this patent
Estimating the term…
Abstract
A battery pack monitoring apparatus is provided. The apparatus includes a voltage measurement system configured to couple to opposed ends of each of a plurality of blocks of a battery pack and to measure voltages thereof, the blocks being coupled in series by interconnects each having an interconnect resistance. The voltage measurement system is configured to derive an internal resistance of each of the plurality of blocks based upon the voltages of the opposed ends of each of the plurality of blocks and based upon a measurement of current of the battery pack and derive the interconnect resistance of each of the interconnects based upon the voltages of the opposed ends of each of the plurality of blocks and based upon the measurement of current.
Claims20
A battery pack monitoring apparatus, comprising:
- a voltage measurement system configured to couple to opposed ends of each of a plurality of blocks of a battery pack and to measure voltages thereof, the blocks being coupled in series by interconnects each having an interconnect resistance;
- and
- the voltage measurement system being further configured to:
- derive an internal resistance of each of the plurality of blocks based upon the voltages of the opposed ends of each of the plurality of blocks and based upon a measurement of current of the battery pack;
- and
- derive the interconnect resistance of each of the interconnects based upon the voltages of the opposed ends of each of the plurality of blocks and based upon the measurement of current.
A battery pack monitoring apparatus, comprising:
- a first voltage measurement unit configured to couple to a negative terminal of a battery pack, to a positive terminal of the battery pack, and to a first end of each of a plurality of block interconnects of the battery pack;
- a second voltage measurement unit configured to couple to the negative terminal of the battery pack, to the positive terminal of the battery pack, and to a second end of each of the plurality of block interconnects;
- and
- the first voltage measurement unit and the second voltage measurement unit being configured to:
- derive an interconnect resistance of each of the interconnects based upon voltages of the first end and the second end of each of the plurality of block interconnects and based upon a measurement of current of the battery pack;
- and
- derive an internal resistance of each of a plurality of blocks of the battery pack based upon voltages of the first end and the second end of each of the plurality of block interconnects and based upon the measurement of current;
- wherein the battery pack includes the plurality of blocks with the blocks being connected in series by the block interconnects.
A method of monitoring a battery pack, comprising:
- measuring voltages of first ends of a plurality of interconnects that serially couple blocks of a battery pack, wherein for each of the plurality of interconnects a first end is closer to a negative terminal of the battery pack and an opposed second end is closer to a positive terminal of the battery pack;
- measuring voltages of opposed second ends of the plurality of interconnects;
- measuring a current of the battery pack;
- calculating an interconnect resistance of each of the plurality of interconnects based upon the current, the voltages of the first ends of the interconnects and the voltages of the opposed second ends of the interconnects;
- and
- calculating an internal resistance of each of the blocks based upon the current, the voltages of the first ends of the interconnects and the voltages of the opposed second ends of the interconnects.
Dependencies are inferred from the claim text.