Traction battery assembly

1. A traction battery for a vehicle comprising:

a tray including a top defining a recessed open channel; and

cells stacked in an array and each including a dielectric pouch that receives the cell, wherein a bottom of the array is disposed on the top covering the channel to form a chamber configured to circulate liquid coolant, the bottom forming a ceiling of the chamber that is in direct contact with the coolant during operation.

2. The traction battery of claim 1 wherein the tray further includes a sidewall defining a port in fluid communication with the channel.

3. The traction battery of claim 1 further comprising sealant disposed around a perimeter of the channel and sandwiched between the array and the tray to prevent the coolant from leaking.

4. The traction battery of claim 3 wherein the sealant is a gasket or silicone.

5. The traction battery of claim 1 further comprising endplates sandwiching the array and bracketry connected between the endplates, wherein the endplates and bracketry cooperate to compress the cells creating a liquid-tight seal between adjacent cells.

6. The traction battery of claim 1 further comprising sealant disposed between each of the cells creating a liquid-tight seal between adjacent cells.

7. The traction battery of claim 1 further comprising a cover encasing the array and connected to the tray, wherein the tray and the cover cooperate to define a battery case.

8. A traction battery for a vehicle comprising:

a manifold including a body defining an open cavity recessed therein; and

a plurality of cells stacked in an array and disposed on the body such that a side of the array covers the cavity and cooperates with the open cavity to define a coolant chamber configured to circulate liquid coolant directly across the side of the array.

9. The traction battery of claim 8 wherein each of the cells is at least partially surrounded by a dielectric material.

10. The traction battery of claim 8 further comprising sealant disposed around a perimeter of the cavity and sandwiched between the array and the body to prevent the coolant from leaking.

11. The traction battery of claim 10 wherein the sealant is a gasket or silicone.

12. The traction battery of claim 8 further comprising endplates sandwiching the array and bracketry connected between the endplates, wherein the endplates and bracketry cooperate to compress the cells creating a liquid-tight seal between adjacent cells.

13. The traction battery of claim 8 further comprising sealant disposed between each of the cells creating a liquid-tight seal between adjacent cells.

14. The traction battery of claim 8 further comprising a tray supporting the manifold and the array.

15. A traction battery for a vehicle comprising:

a manifold defining a channel configured to circulate liquid coolant; and

a plurality of cells stacked in an array and each including a dielectric material surrounding at least a portion of the cell, wherein a side of the array is disposed against the manifold and covers the channel such that the side cooperates with the channel to define a coolant chamber and the side is in direct contact with the coolant during operation.

16. The traction battery of claim 15 wherein the manifold defines at least one port in fluid communication with the channel.

17. The traction battery of claim 15 further comprising sealant disposed around a perimeter of the channel and sandwiched between the array and the manifold to prevent the coolant from leaking.

18. The traction battery of claim 17 wherein the sealant is a gasket or silicone.

19. The traction battery of claim 15 further comprising sealant disposed between each of the cells creating a liquid-tight seal between adjacent cells.

20. The traction battery of claim 15 wherein the channel is a recessed open channel.