Internal resistance estimation method for secondary battery, output control method for secondary battery, and vehicle
First Claim
1. An output control and internal resistance estimation method for a secondary battery, the internal resistance estimation method being a method of estimating an internal resistance value of the secondary battery including a positive electrode and a negative electrode, comprising:
- acquiring an initial internal resistance value of the secondary battery;
monitoring the secondary battery to acquire temperature course information, the temperature course information including a battery temperature of the secondary battery at least during use of the secondary battery and time information about time at which the battery temperature has been recorded;
periodically acquiring and storing the temperature course information;
repetitively estimating an increased amount of the internal resistance value of the secondary battery, after a lapse of a predetermined time, on the basis of the stored temperature course information;
repetitively estimating a reduced amount of the internal resistance value of the secondary battery resulting from a relative change between a range of use of a state of charge of the positive electrode and a range of use of a state of charge of the negative electrode, after the lapse of the predetermined time, on the basis of the stored temperature course information;
repetitively calculating an internal resistance variation in the lapse of the predetermined time, on the basis of the increased amount and the reduced amount of the internal resistance value; and
adjusting an output of the secondary battery, based on the internal resistance variation.
1 Assignment
0 Petitions
Accused Products
Abstract
An internal resistance estimation method for a secondary battery includes: acquiring an initial internal resistance value and temperature course information including a battery temperature and time information about time at which the battery temperature has been recorded; estimating an increased amount of the internal resistance value after a lapse of a predetermined time from the predetermined reference time on the basis of the temperature course information; estimating a reduced amount of the internal resistance value of the secondary battery resulting from a relative change between a range of use of a state of charge of the positive electrode and a range of use of a state of charge of the negative electrode on the basis of the temperature course information; and calculating an internal resistance variation in the lapse of the predetermined time on the basis of the increased amount and the reduced amount.
-
Citations
9 Claims
-
1. An output control and internal resistance estimation method for a secondary battery, the internal resistance estimation method being a method of estimating an internal resistance value of the secondary battery including a positive electrode and a negative electrode, comprising:
-
acquiring an initial internal resistance value of the secondary battery; monitoring the secondary battery to acquire temperature course information, the temperature course information including a battery temperature of the secondary battery at least during use of the secondary battery and time information about time at which the battery temperature has been recorded; periodically acquiring and storing the temperature course information; repetitively estimating an increased amount of the internal resistance value of the secondary battery, after a lapse of a predetermined time, on the basis of the stored temperature course information; repetitively estimating a reduced amount of the internal resistance value of the secondary battery resulting from a relative change between a range of use of a state of charge of the positive electrode and a range of use of a state of charge of the negative electrode, after the lapse of the predetermined time, on the basis of the stored temperature course information; repetitively calculating an internal resistance variation in the lapse of the predetermined time, on the basis of the increased amount and the reduced amount of the internal resistance value; and adjusting an output of the secondary battery, based on the internal resistance variation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A secondary battery output control system comprising:
-
a secondary battery that serves as a power supply for propelling a vehicle; a thermometer; a current sensor; a voltage sensor; and an output control circuit configured to execute output control over the secondary battery, wherein the output control circuit comprises; a timer; a storage unit configured to store an initial internal resistance value of the secondary battery and temperature course information, the temperature course information including a battery temperature of the secondary battery at least during use of the secondary battery and time information about time at which the battery temperature has been recorded; a battery monitoring device configured to periodically acquire the temperature course information; a power supply control unit configured to repetitively estimate an increased amount of the internal resistance value of the secondary battery, after a lapse of a predetermined time, on the basis of the stored temperature course information, repetitively estimate a reduced amount of the internal resistance value of the secondary battery resulting from a relative change between a range of use of a state of charge of the positive electrode and a range of use of a state of charge of the negative electrode, after the lapse of the predetermined time, on the basis of the stored temperature course information, and repetitively calculate an internal resistance variation in the lapse of the predetermined time, on the basis of the increased amount and the reduced amount of the internal resistance value; and a discharge control unit configured to adjust an output of the secondary battery, based on the internal resistance variation.
-
-
9. A secondary battery output control system comprising:
-
a means for monitoring the secondary battery and periodically acquiring temperature course information, the temperature course information including a battery temperature of the secondary battery at least during use of the secondary battery and time information about time at which the battery temperature has been recorded; a means for storing an initial internal resistance value of the secondary battery and the temperature course information; a means for repetitively estimating an increased amount of the internal resistance value of the secondary battery, after a lapse of a predetermined time, on the basis of the stored temperature course information, repetitively estimating a reduced amount of the internal resistance value of the secondary battery resulting from a relative change between a range of use of a state of charge of the positive electrode and a range of use of a state of charge of the negative electrode, after the lapse of the predetermined time, on the basis of the stored temperature course information, and repetitively calculating an internal resistance variation in the lapse of the predetermined time, on the basis of the increased amount and the reduced amount of the internal resistance value; and a means for controlling the output of the secondary battery, based on the internal resistance variation.
-
Specification