Electrified vehicle with auxiliary battery rack having collapsible frame and corresponding method

1. An electrified vehicle, comprising:

an auxiliary battery rack located at least partially within a storage compartment of the electrified vehicle, the auxiliary battery rack including a frame configurable in a support position and a collapsed position in which the frame occupies less volume in the storage compartment than when in the support position; and

a battery pack configured to supply electrical power to an electrical machine, wherein at least one auxiliary battery is electrically coupled to the battery pack via the auxiliary battery rack.

2. The electrified vehicle as recited in claim 1 , wherein, when the frame is in the support position, the auxiliary battery rack is configured to support at least one auxiliary battery.

3. The electrified vehicle as recited in claim 1 , further comprising a DC-to-DC converter configured to increase the voltage provided by the at least one auxiliary battery and supply the increased voltage to the battery pack.

4. The electrified vehicle as recited in claim 1 , wherein the storage compartment is one of a rear trunk and a front trunk of the electrified vehicle.

5. An electrified vehicle, comprising:

an auxiliary battery rack located at least partially within a storage compartment of the electrified vehicle, the auxiliary battery rack including a frame configurable in a support position and a collapsed position in which the frame occupies less volume in the storage compartment than when in the support position; and

wherein, when the frame is in the support position, the frame provides a plurality of bays, each configured to receive an auxiliary battery.

6. The electrified vehicle as recited in claim 5 , wherein:

the frame includes a first plate, a second plate arranged generally opposite the first plate, a plurality of columns extending between the first and second plates, and a backplate connected to the first and second plates and arranged generally opposite the plurality of columns, and

each of the plurality of bays is provided between adjacent ones of the plurality columns and between the first and second plates.

7. The electrified vehicle as recited in claim 6 , wherein:

at least one of the first plate and the second plate includes a plurality of channels,

each of the channels faces a respective one of the plurality of bays, and

each of the channels are configured to guide an auxiliary battery.

8. The electrified vehicle as recited in claim 7 , wherein a width dimension of the channels tapers moving toward the backplate.

9. The electrified vehicle as recited in claim 6 , wherein:

the backplate includes a plurality of sets of recesses configured to hold the first plate, each set of recesses spaced-apart from one another, and

the first plate is received one of the sets of recesses to establish a distance between the first and second plates and a dimension of each of the bays.

10. The electrified vehicle as recited in claim 9 , wherein the plurality of columns have a dimension corresponding to the distance between the first and second plates.

11. The electrified vehicle as recited in claim 6 , wherein, when the frame is in the collapsed position, the plurality of columns and the first plate lie in a common plane with the second plate.

12. The electrified vehicle as recited in claim 6 , wherein, when the frame is in the collapsed position, the first plate, the plurality of columns, and the second plate are stacked upon one another.

13. The electrified vehicle as recited in claim 6 , wherein the second plate is a thermal exchange plate.

14. The electrified vehicle as recited in claim 6 , wherein the backplate includes an electrical interface configured to electrically couple to the auxiliary batteries.

15. The electrified vehicle as recited in claim 6 , wherein the backplate includes a thermal management feature configured to thermally condition the auxiliary battery rack.

16. The electrified vehicle as recited in claim 15 , wherein the thermal management feature includes a plurality of fans.

17. A method, comprising:

configuring a frame of an auxiliary battery rack from a support position to a collapsed position in which the frame occupies less volume in a storage compartment of an electrified vehicle than when in the support position; and

inserting an auxiliary battery into a bay of the auxiliary battery rack to electrically couple the auxiliary battery to a battery pack of the electrified vehicle, wherein the bay is defined between columns, wherein the columns extend between first and second opposed plates, and wherein the first and second plates are connected to a backplate.

18. The method as recited in claim 17 , further comprising:

adjusting a dimension of the bay by inserting the first plate into one of a plurality of sets of recesses in the backplate.