ENVIRONMENTAL CONTROL USING A DYNAMIC TEMPERATURE SET POINT
Systems and methods related to controlling the environment within a cabin-external battery pack of a vehicle are generally described. In some embodiments, the cabin and the battery have independent cooling and/or heating loops. The inventors have found that effective environment control can be achieved by controlling the cooling system dynamically, that is, determining a suitable cooling element (e.g., evaporator) operating temperature based on a multitude of vehicle operating parameters without implementing a fixed set point, and then cooling and/or heating the battery pack accordingly. In some embodiments, the battery pack temperature control system includes a controller configured to determine a condition related to the operating state of the vehicle (e.g., by receiving a signal corresponding to the condition) and alter a temperature set point in the control system based at least in part upon the condition. In this way, the cooling load provided to the battery pack can be adjusted depending upon a variety of factors related to the operating state of the vehicle.
1 . A system for controlling temperature within a battery pack of a vehicle, comprising:
a battery pack; and
a control unit constructed and arranged to alter a temperature set point of a cooling element configured to alter a temperature of the battery pack,
wherein the alteration of the temperature set point of the cooling element is based at least in part upon a condition related to an operating state of the vehicle.
2 . The system of claim 1 , wherein the control unit is constructed and arranged to dynamically alter a temperature set point of a cooling element based at least in part upon a condition related to an operating state of the vehicle.
3 . The system of claim 1 , wherein the cooling element comprises an evaporator.
4 . The system of claim 1 , wherein the control unit is constructed and arranged to receive a signal indicative of an operating state of the vehicle.
5 . The system of claim 1 , wherein the operating state of the vehicle comprises an acceleration level and/or deceleration level of the vehicle.
6 . The system of claim 5 , wherein the operating state of the vehicle comprises a substantially instantaneous acceleration level and/or deceleration level of the vehicle.
7 . The system of claim 5 , wherein the operating state of the vehicle comprises an average acceleration level and/or deceleration level of the vehicle.
8 . The system of claim 1 , wherein the operating state of the vehicle comprises a speed of the vehicle.
9 . The system of claim 8 , wherein the operating state of the vehicle comprises a substantially instantaneous speed of the vehicle.
10 . The system of claim 8 , wherein the operating state of the vehicle comprises an average speed of the vehicle.
11 . The system of claim 1 , wherein the operating state of the vehicle comprises a temperature.
12 . The system of claim 11 , wherein the temperature comprises a temperature within the battery pack.
13 . The system of claim 11 , wherein the temperature comprises a temperature outside the battery pack.
14 . The system of claim 13 , wherein the temperature outside the battery pack comprises a temperature indicative of the ambient air temperature outside the vehicle.
15 . The system of claim 11 , wherein the operating state of the vehicle comprises a plurality of temperatures.
16 . The system of claim 1 , wherein the operating state of the vehicle comprises a regenerative braking level.
17 . The system of claim 1 , wherein the operating state of the vehicle comprises a state of charge of the battery pack.
18 . The system of claim 1 , wherein the operating state of the vehicle comprises a rate of change of the state of charge of the battery pack.
19 . The system of claim 1 , wherein the operating state of the vehicle comprises a characteristic of a programmable driver profile.
20 . The system of claim 1 , wherein the operating state of the vehicle comprises a ratio of a flow rate of a fresh temperature control fluid to a flow rate of a battery-pack recirculated component of a temperature control fluid within the battery pack.
21 . The system of claim 20 , wherein the temperature control fluid comprises air.
22 . The system of claim 1 , wherein the operating state of the vehicle comprises information from a navigation and telematics system of the vehicle.
23 . The system of claim 1 , wherein the vehicle comprises an automobile.
24 . The system of claim 1 , wherein the battery pack is used to power the drive train of the vehicle.
25 . A method of controlling temperature within a battery pack of a vehicle, comprising:
determining a condition related to an operating state of the vehicle;
based at least in part upon the determination, altering a temperature set point of a cooling element configured to alter a temperature of the battery pack; and
altering a temperature of the battery pack in response to the alteration of the temperature set point.
26 . A method as in claim 25 , wherein determining a condition related to an operating state of the vehicle comprises transmitting a signal to a controller.
27 . A method as in claim 25 , wherein altering a temperature of the battery pack comprises transporting a temperature control fluid through a region proximate the cooling element to cool the temperature control fluid.
28 . A method as in claim 27 , wherein the temperature control fluid comprises air.
29 . A method as in claim 25 , wherein the cooling element comprises an evaporator.