Systems and methods for determining battery capacity level
First Claim
1. A battery gas gauge for energy efficient measuring of charge of a battery pack comprising a rechargeable multi-cell battery pack, comprising:
- a voltage detection unit coupled to said battery pack and operable for measuring a plurality of open circuit voltages of a plurality of cells in said battery pack respectively; and
a processor coupled to said voltage detection unit and operable for determining a minimum open circuit voltage of said open circuit voltages, and for determining a first relative state of charge of said battery pack based on a relationship between said minimum open circuit voltage and a corresponding relative state of charge of a cell having said minimum open circuit voltage.
2 Assignments
0 Petitions
Accused Products
Abstract
A battery gas gauge includes a voltage detection unit and a processor. The voltage detection unit is coupled to a battery pack and can measure a plurality of open circuit voltages of a plurality of cells in the battery pack respectively. The processor is coupled to the voltage detection unit and can determine a minimum open circuit voltage of the open circuit voltages, and can determine a first relative state of charge of the battery pack based on a relationship between the minimum open circuit voltage and a corresponding relative state of charge of a cell having the minimum open circuit voltage. The processor can further determine a capacity level of the battery pack based on the first relative state of charge and a rated full capacity level of the battery pack.
-
Citations
19 Claims
-
1. A battery gas gauge for energy efficient measuring of charge of a battery pack comprising a rechargeable multi-cell battery pack, comprising:
-
a voltage detection unit coupled to said battery pack and operable for measuring a plurality of open circuit voltages of a plurality of cells in said battery pack respectively; and a processor coupled to said voltage detection unit and operable for determining a minimum open circuit voltage of said open circuit voltages, and for determining a first relative state of charge of said battery pack based on a relationship between said minimum open circuit voltage and a corresponding relative state of charge of a cell having said minimum open circuit voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An electronic system for energy efficient measuring of charge of a battery pack comprising a rechargeable multi-cell battery pack, comprising:
-
a voltage detection unit coupled to a said battery pack and operable for measuring a plurality of open circuit voltages of a plurality of cells in said battery pack respectively; a processor coupled to said voltage detection unit and operable for determining a minimum open circuit voltage of said open circuit voltages, and for determining a first relative state of charge of said battery pack based on said minimum open circuit voltage and a predetermined lookup table; and a storage unit coupled to said processor and for storing said predetermined lookup table, wherein said predetermined lookup table stores different relative state of charges of said battery pack corresponding to different levels of said minimum open circuit voltage. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. A method for energy efficient determining a capacity level of a battery pack comprising a plurality of cells, said battery pack comprising a rechargeable multi-cell battery pack, said method comprising:
-
measuring a plurality of open circuit voltages of said cells respectively; determining a minimum open circuit voltage of said open circuit voltages; and determining a first relative state of charge of said battery pack based on said minimum open circuit voltage and a predetermined lookup table, wherein said lookup table indicates a relationship between said minimum open circuit voltage and a corresponding relative state of charge of a cell having said minimum open circuit voltage. - View Dependent Claims (15, 16, 17, 18, 19)
-
Specification