BATTERY HUMIDITY CONTROL
Systems and methods are provided for controlling humidity in gases exposed to batteries, which can be applied to humidity control in climate control gases in battery packs, for example those used in electric vehicles.
1 . A system for inhibiting condensation within a battery pack, comprising:
a humidity sensor constructed and arranged to determine the humidity of a first gas portion to which at least one region within the battery pack is or will be exposed; and
a control system constructed and arranged to alter, responsive at least in part to the humidity determination, a dew point of a second gas portion such that condensation is inhibited.
2 . A system for controlling humidity within a battery pack, comprising:
a humidity sensor constructed and arranged to determine the humidity of a first gas portion to which at least one region within the battery pack is or will be exposed; and
a control system constructed and arranged to alter, responsive at least in part to the humidity determination, at least one of a temperature of a second gas portion, a flow rate of a second gas portion, and/or a ratio of fresh to battery-pack recirculated components of a second gas portion.
3 . A system for controlling humidity within a battery pack, comprising:
a battery pack comprising at least one electrochemically rechargeable battery cell;
a passageway fluidically connecting the battery pack to a gas outside the battery pack;
a passageway within the battery pack constructed and arranged to provide a flow path for recirculated gas within the battery pack;
a humidity sensor constructed and arranged to determine the humidity of at least one region within the battery pack and/or within the passageway; and
a control system constructed and arranged to establish a ratio of a flow rate of the gas from outside the battery back to a flow rate of the recirculated gas based at least in part upon the humidity determination.
4 . A system for controlling humidity within a battery pack, comprising:
a battery pack comprising at least one electrochemically rechargeable battery cell;
a passageway fluidically connecting the battery pack to a gas outside the battery pack;
a humidity sensor constructed and arranged to determine the humidity of at least one region within the battery pack and/or the passageway; and
a control system constructed and arranged to alter a temperature of the gas from outside the battery pack based at least in part upon the humidity determination.
5 . A system for altering the humidity within a battery pack, comprising:
a battery pack comprising at least one electrochemically rechargeable battery cell;
a passageway fluidically connecting the battery pack to a gas outside the battery pack;
a humidity sensor constructed and arranged to determine the humidity of at least one region within the battery pack; and
a control system constructed and arranged to alter a flow rate of the gas from outside the battery pack into the battery pack based at least in part upon the humidity determination.
6 . A system as in claim 1 , wherein the first and second gas portions comprise different portions of a larger volume of gas.
7 . A system as in claim 1 , wherein the first gas and the second gas comprise substantially the same portions of gas.
8 . A system as in claim 1 , wherein the control system is constructed and arranged to alter, responsive at least in part to the humidity determination, a dew point of a second gas such that condensation is inhibited.
9 . A system as in claim 1 , further comprising a temperature sensor constructed and arranged to determine a temperature of a region within the battery pack.
10 . A system as in claim 1 , wherein the control system is constructed and arranged to alter the dew point of the second gas based at least in part upon the determination of the temperature of the region within the battery pack.
11 . A system as in claim 1 , further comprising a plurality of temperature sensors constructed and arranged to determine a minimum temperature of the battery pack.
12 . A system as in claim 1 , wherein the control system is constructed and arranged to alter the dew point of the second gas based at least in part upon the determination of the minimum temperature of the battery pack.
13 . A system as in claim 1 , wherein the battery pack comprises a single electrochemically rechargeable battery cell.
14 . A system as in claim 1 , wherein the battery pack comprises a plurality of electrochemically rechargeable battery cells.
15 . A system as in claim 1 , wherein the gas comprises a climate control gas for controlling the climate within the battery pack.
16 . A system as in claim 1 , wherein the humidity sensor is located within the battery pack.
17 . A system as in claim 1 , wherein the humidity sensor is located within the passageway within the battery pack constructed and arranged to provide a flow path for recirculated gas within the battery pack
18 . A system as in claim 1 , wherein the humidity sensor is located within the passageway fluidically connecting the battery pack to a gas outside the battery pack.
19 . A system as in claim 1 , wherein the battery pack is constructed and arranged to power, at least in part, a vehicle.
20 . A system as in claim 1 , wherein the battery pack is constructed and arranged to power, at least in part, the drive train of a vehicle.
21 . A method for inhibiting condensation within a battery pack, comprising:
determining the humidity of a first gas portion to which at least one region within a battery pack is exposed, and
altering a property of a second gas portion, based at least in part upon the humidity determination, such that the dew point of the second gas portion is lower than a minimum temperature within the at least one region within the battery pack.
22 . A method for controlling humidity within a battery pack, comprising:
determining the humidity of at least one region within a battery pack comprising at least one electrochemically rechargeable battery cell and/or within a passageway fluidically connecting the battery pack to a gas outside the battery pack, and
altering at least one of a temperature of a gas transported into the battery pack, a flow rate of the gas transported into the battery pack, and/or a ratio of a flow rate of the gas transported into the battery pack to a flow rate of a gas recirculated within the battery pack based at least in part upon the humidity determination.
23 . A method as in claim 21 , wherein the first and second gas portions comprise different portions of a larger volume of gas.
24 . A method as in claim 21 , wherein the first gas and the second gas comprise substantially the same portions of gas.
25 . A method as in claim 21 , comprising altering a temperature of a gas transported into the battery pack.
26 . A method as in claim 21 , comprising altering a flow rate of the gas transported into the battery pack based at least in part upon the humidity determination.
27 . A method as in claim 21 , comprising altering a flow rate of the gas transported into the battery pack based at least in part upon the humidity determination.
28 . A method as in claim 21 , comprising altering a ratio of a flow rate of the gas transported into the battery pack to a flow rate of a gas recirculated within the battery pack based at least in part upon the humidity determination.
29 . A method as in claim 21 , further comprising determining the value of the minimum temperature within the battery pack.
30 . A method as in claim 21 , further comprising determining the location of the minimum temperature within the battery pack.
31 . A method as in claim 21 , wherein the battery pack comprises a single electrochemically rechargeable battery cell.
32 . A method as in claim 21 , wherein the battery pack comprises a plurality of electrochemically rechargeable battery cells.
33 . A method as in claim 21 , wherein the battery pack is used to power, at least in part, a vehicle.
34 . A method as in claim 21 , wherein the battery pack is used to power, at least in part, the drive train of a vehicle.
35 . A method as in claim 21 , wherein a gas is used to control a temperature within the battery pack.