Method and apparatus for predicting battery temperature
First Claim
1. A microprocessor-implemented method of predicting a temperature of a battery having a plurality of cells, said method comprising the steps of:
- (a) determining heat transfer coefficients for said battery, a first of said heat transfer coefficients being representative of heat transfer between the cells of said battery;
(b) storing said heat transfer coefficients in a memory segment;
(c) retrieving said heat transfer coefficients from said memory segment;
(d) measuring the current air temperature surrounding the battery; and
(e) approximating individual cell temperatures based on said current air temperature and heat transfer coefficients.
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Accused Products
Abstract
A vehicle control unit estimates a temperature of the vehicle'"'"'s battery including the temperature of each of the battery'"'"'s plurality of cells. The control unit includes a memory unit having stored therein heat transfer coefficients of three types. The first type is representative of heat transfer between the cells of the battery; the second type is representative of heat transfer between the surrounding air and the middle cells of the battery; and the third type is representative of heat transfer between the surrounding air and the end cells of the battery. A microprocessor retrieves the heat transfer coefficients from the memory unit and determines individual cell temperatures of the battery based on the heat transfer coefficients, temperature of the ambient air, and the drive state of the vehicle.
25 Citations
24 Claims
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1. A microprocessor-implemented method of predicting a temperature of a battery having a plurality of cells, said method comprising the steps of:
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(a) determining heat transfer coefficients for said battery, a first of said heat transfer coefficients being representative of heat transfer between the cells of said battery; (b) storing said heat transfer coefficients in a memory segment; (c) retrieving said heat transfer coefficients from said memory segment; (d) measuring the current air temperature surrounding the battery; and (e) approximating individual cell temperatures based on said current air temperature and heat transfer coefficients. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method, implemented in a control unit, of predicting a temperature of a battery having a plurality of cells, said method comprising the steps of:
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(a) providing, in a storage device of said control unit, (i) heat transfer coefficients for said battery, a first of said heat transfer coefficients being representative of heat transfer between the cells of said battery, and (ii) a set of multipliers for at least one of said heat transfer coefficients, said multipliers corresponding to different external factors of said battery; (b) measuring a current air temperature; (c) selecting a multiplier among said set of multipliers in accordance with said external factors; (d) approximating a set of individual cell temperatures based on said heat transfer coefficients, said current air temperature, and said multiplier; and (e) estimating the temperature of said battery based on said individual cell temperatures. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A vehicle control unit which predicts a temperature of a battery of a vehicle having a plurality of cells comprising:
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a temperature sensor for sensing the temperature of the air surrounding the battery and producing an air temperature signal related thereto; a memory unit having stored therein heat transfer coefficients, a first of said heat transfer coefficients being representative of heat transfer between the cells of said battery; and a processor which retrieves said heat transfer coefficients from said memory unit and determines individual cell temperatures of said battery based on said heat transfer coefficients and said air temperature signal. - View Dependent Claims (21, 22, 23, 24)
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Specification