Desired departure temperature for a battery in a vehicle

1. A system, comprising:

a processor; and

a memory coupled with the processor, wherein the memory is configured to provide the processor with instructions which when executed cause the processor to:

determine a desired departure temperature for a battery, having a temperature, in a vehicle based at least in part on an output of an estimation function that receives trip information associated with a trip as an input and outputs a change in battery temperature associated with the trip based on at least the trip information; and

use a temperature controlling system to bring the temperature of the battery towards the desired departure temperature, wherein the vehicle begins the trip with the battery at the desired departure temperature.

2. The system recited in claim 1 , wherein the trip information includes one or more of the following: a trip duration, a destination, a trip distance, or a trip plan.

3. The system recited in claim 1 , wherein determining the desired departure temperature is further based at least in part on one or more of the following: state of health information associated with the battery, an average cell internal resistance, a minimum cell capacity, or ambient temperature.

4. The system recited in claim 1 , wherein the trip information includes a trip duration, wherein determining the desired departure temperature includes:

determining the change in battery temperature associated with the trip using the trip duration and the estimation function that inputs the trip duration; and

determining the desired departure temperature using the change in battery temperature associated with the trip and a desired battery temperature range.

5. The system recited in claim 1 , wherein the trip information includes a trip plan, wherein determining the desired departure temperature includes:

determining the change in battery temperature associated with the trip using the trip plan and the estimation function that inputs the trip plan; and

determining the desired departure temperature using the change in battery temperature associated with the trip and a desired battery temperature range.

6. The system recited in claim 1 , wherein determining the desired departure temperature includes:

generating, for each of a plurality of test departure temperatures, a plurality of modeled battery data using a battery model associated with the battery;

evaluating each of the plurality of modeled battery data using a cost function in order to obtain an evaluated cost function wherein the cost function takes into account at least battery performance and battery degradation; and

outputting that test departure temperature from the plurality of test departure temperatures which corresponds to a minimum of the evaluated cost function as the desired departure temperature.

7. The system recited in claim 1 , wherein:

the trip information includes a departure time;

the memory is further configured to provide the processor with instructions which when executed cause the processor to: determine a start time to start the temperature controlling system based at least in part on the departure time and the desired departure temperature; and

the temperature controlling system is started at the start time.

8. A method, comprising:

providing trip information associated with a trip as an input to an estimation function;

determining a desired departure temperature for a battery, having a temperature, in a vehicle based at least in part on an output of an estimation function that receives trip information associated with a trip as an input and outputs a change in battery temperature associated with the trip based on at least the trip information; and

using a temperature controlling system to bring the temperature of the battery towards the desired departure temperature, wherein the vehicle begins the trip with the battery at the desired departure temperature.

9. The method recited in claim 8 , wherein the trip information includes one or more of the following: a trip duration, a destination, a trip distance, or a trip plan.

10. The method recited in claim 8 , wherein determining the desired departure temperature is further based at least in part on one or more of the following: state of health information associated with the battery, an average cell internal resistance, a minimum cell capacity, or ambient temperature.

11. The method recited in claim 8 , wherein the trip information includes a trip duration, wherein determining the desired departure temperature includes:

determining the change in battery temperature associated with the trip using the trip duration and the estimation function that inputs the trip duration; and

determining the desired departure temperature using the change in battery temperature associated with the trip and a desired battery temperature range.

12. The method recited in claim 8 , wherein the trip information includes a trip plan, wherein determining the desired departure temperature includes:

determining the change in battery temperature associated with the trip using the trip plan and the estimation function that inputs the trip plan; and

determining the desired departure temperature using the change in battery temperature associated with the trip and a desired battery temperature range.

13. The method recited in claim 8 , wherein determining the desired departure temperature includes:

generating, for each of a plurality of test departure temperatures, a plurality of modeled battery data using a battery model associated with the battery;

evaluating each of the plurality of modeled battery data using a cost function in order to obtain an evaluated cost function wherein the cost function takes into account at least battery performance and battery degradation; and

outputting that test departure temperature from the plurality of test departure temperatures which corresponds to a minimum of the evaluated cost function as the desired departure temperature.

14. The method recited in claim 8 , wherein:

the trip information includes a departure time;

the method further includes: determining a start time to start the temperature controlling system based at least in part on the departure time and the desired departure temperature; and

the temperature controlling system is started at the start time.

15. A computer program product, the computer program product being embodied in a non-transitory computer readable storage medium and comprising computer instructions for:

providing trip information associated with a trip as an input to an estimation function;

determining a desired departure temperature for a battery, having a temperature, in a vehicle based at least in part on an output of an estimation function that receives trip information associated with a trip as an input and outputs a change in battery temperature associated with the trip based on at least the trip information; and

using a temperature controlling system to bring the temperature of the battery towards the desired departure temperature, wherein the vehicle begins the trip with the battery at the desired departure temperature.

16. The computer program product recited in claim 15 , wherein determining the desired departure temperature is further based at least in part on one or more of the following: state of health information associated with the battery, an average cell internal resistance, a minimum cell capacity, or ambient temperature.

17. The computer program product recited in claim 15 , wherein the trip information includes a trip duration, wherein determining the desired departure temperature includes:

determining the change in battery temperature associated with the trip using the trip duration and the estimation function that inputs the trip duration; and

determining the desired departure temperature using the change in battery temperature associated with the trip and a desired battery temperature range.

18. The computer program product recited in claim 15 , wherein the trip information includes a trip plan, wherein determining the desired departure temperature includes:

determining the change in battery temperature associated with the trip using the trip plan and the estimation function that inputs the trip plan; and

determining the desired departure temperature using the change in battery temperature associated with the trip and a desired battery temperature range.

19. The computer program product recited in claim 15 , wherein determining the desired departure temperature includes:

generating, for each of a plurality of test departure temperatures, a plurality of modeled battery data using a battery model associated with the battery;

evaluating each of the plurality of modeled battery data using a cost function in order to obtain an evaluated cost function wherein the cost function takes into account at least battery performance and battery degradation; and

outputting that test departure temperature from the plurality of test departure temperatures which corresponds to a minimum of the evaluated cost function as the desired departure temperature.

20. The computer program product recited in claim 15 , wherein:

the trip information includes a departure time;

the computer program product further includes computer instructions for: determining a start time to start the temperature controlling system based at least in part on the departure time and the desired departure temperature; and

the temperature controlling system is started at the start time.