Apparatus and method for estimating temperature of battery
The present disclosure discloses an apparatus for estimating temperature of at least one secondary battery in a battery pack including at least one secondary battery. The battery temperature estimation apparatus according to the present disclosure is an apparatus for estimating temperature of at least one secondary battery in a battery pack including at least one secondary battery, and includes a board temperature measuring unit provided on an integrated circuit board provided in the battery pack to measure a temperature of the integrated circuit board, and a calculating unit which calculates a temperature of the secondary battery using the temperature of the integrated circuit board measured by the board temperature measuring unit and an ambient temperature of the battery pack.
1. A battery temperature estimation apparatus for estimating temperature of at least one secondary battery in a battery pack including at least one secondary battery, the battery temperature estimation apparatus comprising:
a board temperature measuring unit mounted on an integrated circuit board provided in the battery pack, the board temperature measuring unit being configured to measure a temperature of the integrated circuit board; and
a calculating unit configured to:
calculate an estimated temperature of the secondary battery using:
the temperature of the integrated circuit board measured by the board temperature measuring unit; and
an ambient temperature of the battery pack, the ambient temperature being measured by an ambient temperature measuring unit; and
a memory configured to store a plurality of correction factors respectively corresponding to a plurality of ambient temperatures,
wherein the calculating unit is further configured to calculate the estimated temperature of the secondary battery by applying one of the correction factors stored in the memory, corresponding to the ambient temperature of the battery pack, to a difference between the temperature of the integrated circuit board and the ambient temperature of the battery pack, and
wherein the calculating unit is further configured to calculate the estimated temperature of the secondary battery based on an equation:
T Cell =( T Chip −T Ambient )×correction factor+ T Ambient ,
where T Cell is the estimated temperature of the secondary battery, T Chip is the temperature of the integrated circuit board, and T Ambient is the ambient temperature of the battery pack.
2. The battery temperature estimation apparatus according to claim 1 , wherein the calculating unit is further configured to calculate the estimated temperature of the secondary battery using a value obtained by multiplying the difference between the temperature of the integrated circuit board and the ambient temperature of the battery pack by the one of the correction factors.
3. The battery temperature estimation apparatus according to claim 2 , wherein the calculating unit is further configured to calculate the estimated temperature of the secondary battery by adding the ambient temperature of the battery pack to the value obtained by multiplying the difference between the temperature of the integrated circuit board and the ambient temperature of the battery pack by the one of the correction factors.
4. The battery temperature estimation apparatus according to claim 1 , wherein the memory is further configured to:
transmit the one of the correction factors corresponding to the ambient temperature of the battery pack to the calculating unit.
5. The battery temperature estimation apparatus according to claim 4 , wherein the memory is further configured to store the correction factors, each defined based on a measured temperature of the secondary battery, a measured temperature of the integrated circuit board, and a measured ambient temperature of the battery pack, obtained through a prior temperature measurement operation.
6. The battery temperature estimation apparatus according to claim 5 , wherein each of the correction factors has a correction coefficient defined based on a mean value obtained by dividing a difference value between the prior measured temperature of the secondary battery and the prior measured ambient temperature of the battery pack by a difference value between the prior measured temperature of the integrated circuit board and the prior measured ambient temperature of the battery pack, and the prior measured ambient temperature of the battery pack.
7. The battery temperature estimation apparatus according to claim 6 , wherein the calculating unit is further configured to calculate the estimated temperature of the secondary battery using the correction coefficient corresponding to the one of the correction factors.
8. The battery temperature estimation apparatus according to claim 1 , wherein the ambient temperature measuring unit is configured to:
measure the ambient temperature of the battery pack; and
transmit the measured ambient temperature to the calculating unit.
9. The battery temperature estimation apparatus according to claim 1 , wherein the one of the correction factors is defined based on:
( T cell real −T Ambient real )/( T Chip real −T Ambient real ),
where T Cell real is a measured temperature of the secondary battery, T Ambient real is a measured ambient temperature of the battery pack, and T Chip real is a measured temperature of the integrated circuit board, each measured in a prior temperature measurement operation.
10. A battery pack comprising the battery temperature estimation apparatus according to claim 1 .
11. The battery pack of claim 10 , further comprising a battery management system (BMS), the BMS including at least the calculating unit and the memory,
wherein the BMS is configured to control the battery pack based on the estimated temperature of the secondary battery.
12. A battery temperature estimation method for estimating temperature of at least one secondary battery in a battery pack including at least one secondary battery, the battery temperature estimation method comprising:
measuring a temperature of an integrated circuit board provided in the battery pack;
determining a correction factor, among a plurality of correction factors stored in a memory, corresponding to an ambient temperature of the battery pack measured by an ambient temperature measuring unit; and
calculating an estimated temperature of the secondary battery by applying the determined correction factor stored in the memory, corresponding to the ambient temperature of the battery pack, to a difference between:
the temperature of the integrated circuit board measured in the measuring of the temperature; and
the ambient temperature of the battery pack,
wherein the calculating includes calculating the estimated temperature of the secondary battery based on an equation:
T Cell =( T Chip −T Ambient )×correction factor+ T Ambient ,
where T Cell is the estimated temperature of the secondary battery, T Chip is the temperature of the integrated circuit board, and T Ambient is the ambient temperature of the battery pack.
13. The battery temperature estimation method according to claim 12 , further comprising:
controlling the battery pack based on the estimated temperature of the secondary battery.
14. The battery temperature estimation method according to claim 12 , wherein the determined correction factors is defined based on:
( T cell real −T Ambient real )/( T Chip real −T Ambient real ),
where T Cell real is a measured temperature of the secondary battery, T Ambient real is a measured ambient temperature of the secondary battery, and T Chip real is a measured temperature of the integrated circuit board, each measured in a prior temperature measurement operation.