US 5,321,627 A · Battery monitor and method for providing operating parameters

Abstract

A battery monitor which monitors the operating parameters of a battery to provide an indication of, for example, the absolute state of charge, the relative state of charge, and the capacity of the battery under battery discharge, rest, and recharge conditions. The battery monitor includes a current sensor for sensing battery current, a voltage sensor for sensing battery voltage, and a temperature sensor for sensing battery temperature. A processor approximates to a high level of accuracy the battery parameters utilizing an iterative process based upon predetermined relationships, employing empirically determined constants and parameters determined in the immediately proceeding iteration stored in memory. Output signals indicative of the determined parameters are provided and may be utilized for many different battery applications.

Claims139

Dependent claims

A battery monitor for monitoring operating parameters of a battery, said battery monitor comprising:

voltage sensor means for sensing batter voltage and providing a voltage sensor signal indicative of said battery voltage;
current sensor means for sensing battery current and providing a current sensor signal indicative of said battery current;
processing means coupled to said voltage sensor means and said current sensor means for reading said voltage sensor signal, for reading said current sensor signal, and for computing said operating parameters at spaced apart computing times;
memory means coupled to said processing means for storing selected ones of the last computed said operating parameters;
said processing means determining when said battery is in discharge and computing, responsive to said voltage sensor signal and said current sensor signal, a corrected battery voltage and, from said corrected battery voltage, computing relative state of charge of said battery, said processing means computing a factor representing the difference between absolute state of charge of said battery and sad relative state of charge of said battery, said processing means computing said absolute state of charge of said battery from a sum of said relative state of charge of said battery and said factor;
and
output means coupled to said processing means for providing output signals indicative of predetermined ones of said operating parameters.

4 more elements

A battery monitor for monitoring operating parameters of a battery, said battery monitor comprising:

voltage sensor means for sensing batter voltage and providing a voltage sensor signal indicative of said battery voltage;
current sensor means for sensing battery current and providing a current sensor signal indicative of said battery current;
processing means coupled to said voltage sensor means and said current sensor means for reading said voltage sensor signal, for reading said current sensor signal, and for computing said operating parameters at spaced apart computing times;
memory means coupled to said processing means for storing selected ones of the last computed said operating parameters;
said processing means determining in response to said current sensor signal if said battery is in recharge, said processing means determining state of charge added to said battery since the last said computing time, said processing means computing at each of said computing times and storing in said memory means absolute state of charge of said batter, said processing means computing at each of said computing times and storing in said memory means a factor representing the difference between said absolute state of charge of said battery and relative state of charge of said battery;
and
output means coupled to said processing means for providing output signals indicative of predetermined ones of said operating parameters.

4 more elements

A method of monitoring the operating parameters of a battery, said method comprising the steps of:

providing a voltage sensor;
sensing battery voltage and providing a voltage sensor signal indicative of said battery voltage;
providing a current sensor;
sensing battery current and providing a current sensor signal indicative of said battery current;
providing processing means coupled to said voltage sensor and said current sensor for reading said voltage sensor signal, for reading said current sensor signal, and for computing said operating parameters at spaced apart computing times;
providing memory means coupled to said processing means;
storing selected ones of the last computed said operating parameters in said memory means;
computing, when said battery is in discharge, responsive to said voltage sensor signal and said current sensor signal, a corrected battery voltage and computing from said corrected battery voltage relative state of charge of said battery;
computing a factor representing the difference between absolute state of charge of said battery ad said relative state of charge of sid battery and computing said absolute state of charge of said battery from a sum of said relative state of charge of said battery and said factor;
and
providing output signals indicative of predetermined ones of said operating parameters

8 more elements

A method of monitoring the operating parameters of a battery, sid method comprising the steps of:

providing a voltage sensor;
sensing battery voltage and providing a voltage sensor signal indicative of said battery voltage;
providing a current sensor;
sensing battery current and providing a current sensor signal indicative of said battery current;
providing processing means coupled to said voltage sensor and said current sensor for reading said voltage sensor signal, for reading said current sensor signal, and for computing said operating parameters at spaced apart computing times;
providing memory means coupled to said processing means;
storing selected ones of the last computed said operating parameters in said memory means;
determining, when said battery is in recharge, the state of charge added to said battery since the last said computing time, and computing at each of said computing times and storing in said memory means the absolute state of charge of said battery;
computing at each of said computing times and storing in said memory means a factor representing the difference between said absolute state of charge of said battery and relative state of charge of said battery;
and
providing output signals indicative of predetermined ones of said operating parameters.

8 more elements

Dependencies are inferred from the claim text.

Battery monitor and method for providing operating parameters

Life of this patent

Battery monitor and method for providing operating parameters

Life of this patent

Abstract

Claims139