Traction battery assembly

1. A traction battery assembly comprising:

a tray;

cells each including a terminal side opposite the tray, and stacked in an array that is disposed on the tray; and

a pair of congruent L-shaped side components arranged to form a housing surrounding a perimeter of the array, and being attached together only at two corners to define an open top, the housing being attached to the tray such that the terminal sides extend through the top.

2. The battery assembly of claim 1 wherein the array further includes a pair of longitudinal sides and a pair of lateral sides extending between the longitudinal sidewalls, and wherein each of the L-shaped side components further includes an end wall disposed against one of the lateral sides, and a sidewall disposed against one of the longitudinal sides.

3. The battery assembly of claim 2 wherein each of the longitudinal sides further includes a heat exchanger to thermally regulate the array.

4. The battery assembly of claim 2 wherein a length of each of the sidewalls is less than a length of the opposing longitudinal sides of the array such that the array is axially compressed between the end walls when the first and second L-shaped components are attached together.

5. The battery assembly of claim 1 wherein the housing includes a flange that is fastened to the tray.

6. The battery assembly of claim 1 wherein the housing has only four corners.

7. The battery assembly of claim 1 wherein the housing defines an open bottom and each of the cells extends through the open bottom to contact the tray.

8. A traction battery assembly for a vehicle comprising:

a tray;

a plurality of cells each including a tray side disposed against the tray and a terminal side opposite the tray side, wherein the cells are stacked in an array that has longitudinal and lateral sides oriented substantially perpendicular to the tray; and

first and second L-shaped components each including a sidewall disposed against one of the longitudinal sides and an end wall disposed against one of the lateral sides, the pair of components being attached together only at two corners and cooperating to form a housing having an open bottom and surrounding a perimeter of the array, wherein the housing is attached to the tray such that the tray sides extend through the open bottom to contact the tray.

9. The battery assembly of claim 8 wherein the first and second L-shaped components are congruent.

10. The battery assembly of claim 9 wherein a length of each of the sidewalls is less than a length of the opposing longitudinal sides of the array such that the array is axially compressed between the end walls when the first and second L-shaped components are attached together.

11. The battery assembly of claim 8 wherein the array of cells is stacked directly on the tray.

12. The battery assembly of claim 8 wherein the end wall of each of the components is disposed over a major side of only one cell.

13. The battery assembly of claim 8 wherein the end wall of each of the components further includes a flange configured to be fastened to the tray.

14. The battery assembly of claim 8 wherein at least one of the first and second L-shaped components includes a heat exchanger to thermally regulate the array.

15. The battery assembly of claim 8 wherein the sidewall of each of the components further includes a heat exchanger to thermally regulate the array.

16. The battery assembly of claim 8 wherein the sidewall of the first L-shaped component defines internal plumbing that is configured to circulate a fluid medium to thermally regulate the array.

17. The battery assembly of claim 16 wherein the sidewall of the second L-shaped component defines internal plumbing that is configured to circulate a fluid medium to thermally regulate the array.