Cooling arrangement for an energy storage device
A battery pack includes a thermally conductive plate that can be cooled or heated, and an array of electrochemical cells. The cells include a stacked or rolled arrangement of electrode plates, and a current collector disposed in the battery cell that forms an electrical connection with the electrode plates and provides a thermal conduction pathway for conducting heat from the electrode plates to the thermally conductive plate.
1. An electrochemical cell comprising
a polyhedronal cell housing formed of a flexible laminate material, the cell housing including a first end, a second end opposed to the first end, and a multi-sided sidewall that extends between the first end and the second end,
an electrode assembly disposed in the cell housing, the electrode assembly including a positive electrode plate, a negative electrode plate and a separator, the positive electrode plate stacked with the negative electrode plate, the separator disposed between the positive electrode plate and the negative electrode plate, the electrode assembly including a stack axis that extends in parallel to a stacking direction of the positive electrode plate, the negative electrode plate and the separator, the stack axis extending parallel to the sidewall and perpendicular to the cell housing first and second ends, and
a current collector, the current collector comprising
a collection portion disposed in the cell housing so as to reside between the electrode assembly and one side of the multi-sided sidewall, the collection portion extending parallel to the one side and being electrically and thermally connected to one of the positive electrode plate and the negative electrode plate, and
a fin portion that is disposed outside the cell housing, is electrically and thermally connected to the collection portion, extends in a direction parallel to the second end and overlies the second end, and
a terminal disposed outside of the cell housing so as to overlie the one side, the terminal being electrically and thermally connected to the collection portion.
2. The electrochemical cell of claim 1 , wherein a first end of the terminal is connected to the collection portion and a second end of the terminal is connected to the fin portion, and the second end is opposed to the first end.
3. The electrochemical cell of claim 1 , wherein the fin portion is disposed inside the cell housing between the electrode assembly and the second end.
4. The electrochemical cell of claim 3 , wherein the terminal is connected to a second end of the collection portion and the fin portion is connected to a first end of the collection portion, and the second end is opposed to the first end.
5. The electrochemical cell of claim 3 , wherein the terminal is connected to the collection portion via an opening in the one side.
6. The electrochemical cell of claim 1 , wherein
the current collector is a positive current collector and is electrically d thermally connected to the positive electrode plate, and
the electrochemical cell comprises a negative current collector, the negative current collector comprising
a collection portion disposed in the cell housing between the electrode assembly and the sidewall, the collection portion extending parallel to the sidewall and being electrically and thermally connected to the negative electrode plate, and
a fin portion that is disposed outside the cell housing is electrically and thermally to the collection portion, extends in a direction parallel to the second end and overlies the second end, and
the positive current collector and the negative current collector each pass through the cell housing at the first end.
7. The electrochemical cell of claim 1 , wherein the current collector has a dimension in a direction that is transverse to the stack axis and parallel to the one side, and the dimension is in a range of 30 percent to 98 percent of a corresponding dimension of the one side.
8. The electrochemical cell of claim 1 , wherein the current collector provides two thermal conduction pathways between the one of the positive electrode plate and the negative electrode plate and an exterior of the cell housing.
9. A battery pack comprising
a thermally-conductive plate configured to provide one of heating and cooling,
electrochemical cells supported on the thermally-conductive plate, each cell including
a polyhedronal cell housing formed of a flexible laminate material, the cell housing including a first end, a second end opposed to the first end and facing the thermally-conductive plate, and a multi-sided sidewall that extends between the first end and the second end,
an electrode assembly disposed in the cell housing, the electrode assembly including a positive electrode plate, a negative electrode plate and a separator, the positive electrode plate stacked with the negative electrode plate, the separator disposed between the positive electrode plate and the negative electrode plate, the electrode assembly including a stack axis that extends in parallel to a stacking direction of the positive electrode plate, the negative electrode plate and the separator, the stack axis extending parallel to the sidewall and perpendicular to the cell housing first and second ends, and
a current collector, the current collector comprising
a collection portion disposed in the cell housing so as to reside between the electrode assembly and one side of the multi-sided sidewall, the collection portion extending parallel to the one side and being electrically and thermally connected to one of the positive electrode plate and the negative electrode plate, and
a fin portion that is disposed outside the cell housing, is electrically and thermally connected to the collection portion, extends in a direction parallel to the second end and overlies the second end, and
a terminal disposed outside of the cell housing so as to overlie the one side, the terminal being electrically and thermally connected to the collection portion.
10. Me electrochemical cell of claim 9 , wherein a first end of the terminal is connected to the collection portion and a second end of the terminal is connected to the fin portion, and the second end is opposed to the first end.
11. The electrochemical cell of claim 9 , wherein the fin portion is disposed inside the cell housing between the electrode assembly and the second end.
12. The electrochemical cell of claim 11 , wherein the terminal is connected to a first end of the collection portion and the fin portion is connected to a second end of the collection portion, and the second end is opposed to the first end.
13. The electrochemical cell of claim 11 , wherein the terminal is connected to the collection portion via an opening in the one side.
14. The electrochemical cell of claim 9 , wherein
the current collector is a positive current collector and is electrically and thermally connected to the positive electrode plate, and
the electrochemical cell comprises a negative current collector, the negative current collector comprising
a collection portion, disposed in the cell housing between the electrode assembly and another side of the multi-sided sidewall, the collection portion extending parallel to the sidewall and being electrically and thermally connected to the negative electrode plate, and
a fin portion that is disposed outside the cell housing, is electrically and thermally to the collection portion, extends in a direction parallel to the second end and overlies the second end, and
the positive current collector and the negative current collector each pass through the cell housing at the first end.
15. The electrochemical cell of claim 9 , wherein the current collector has a dimension in a direction that is transverse to the stack axis and parallel to the one side, and the dimension is in a range of 30 percent to 98 percent of a corresponding dimension of the one, side.
16. The electrochemical cell of claim 9 , wherein the current collector provides two thermal conduction pathways between the one of the positive electrode plate and the negative electrode plate and an exterior of the cell housing.
17. A battery pack comprising
a thermally-conductive plate configured to provide one of heating and cooling,
electrochemical cells supported on the thermally-conductive plate, each cell including
a polyhedronal cell housing formed of a flexible laminate material, the cell housing including a first end, a second end opposed to the first end, and a multi-sided sidewall that extends between the first end and the second end, a first side of the multi-sided sidewall facing the thermally-conductive plate,
an electrode assembly disposed in the cell housing, the electrode assembly including a positive electrode plate, a negative electrode plate and a separator, the positive electrode plate stacked with the negative electrode plate, the separator disposed between the positive electrode plate and the negative electrode plate, the electrode assembly including a stack axis that extends in parallel to a stacking direction of the positive electrode plate, the negative electrode plate and the separator, the stack axis extending perpendicular to the cell housing first and second ends,
a first current collector disposed in the cell housing, the first current collector disposed between the electrode assembly and the first side, the first current collector extending parallel to the first side and being electrically and thermally connected to one of the positive electrode plate and the negative electrode plate,
a second current collector disposed in the cell housing, the second current collector disposed between the electrode assembly and a third side of the multi-sided sidewall, the third side being opposed to the first side, the second current collector extending parallel to the third side and being electrically and thermally connected to the other of the positive electrode plate and the negative electrode plate,
a first terminal disposed on the outside of the cell housing so as to overlie the cell housing, the first terminal being electrically and thermally connected to the first current collector, and
a second terminal disposed on the outside of the cell housing so as to overlie the cell housing, the second terminal being electrically and thermally connected to the second current collector,
wherein the positive current collector and the negative current collector each exit the cell housing at the first end, and
the first current collector provides a thermal conduction path from the electrode assembly to the thermally-conductive plate via the first side.
18. An electrochemical cell comprising
a polyhedronal cell housing formed of a flexible laminate material, the cell housing including a first end, a second end opposed to the first end, and a multi-sided sidewall that extends between the first end and the second end,
an electrode assembly disposed in the cell housing, the electrode assembly including a positive electrode plate, a negative electrode plate and a separator, the positive electrode plate stacked with the negative electrode plate, the separator disposed between the positive electrode plate and the negative electrode plate, the electrode assembly including a stack axis that extends in parallel to a stacking direction of the positive electrode plate, the negative electrode plate and the separator, the stack axis extending parallel to the sidewall and perpendicular to the cell housing first and second ends, and
a current collector comprising a plate having a folded and bent configuration, the plate including:
a collection portion that provides one end of the plate and is disposed inside the cell housing between the electrode assembly and one side of the multi-sided sidewall, the collection portion extending in parallel to the one side, the collection portion being electrically and thermally connected to one of the positive electrode plate and the negative electrode plate;
a fin portion that provides an end of the plate that is opposed to the one end of the plate, the fin portion being disposed outside of the cell housing so as to overlie the second end, the fin portion extending in a direction parallel to the second end, and
a terminal portion that provides a central portion of the plate and is disposed outside of the cell housing so as to overlie the one side, one end of the terminal portion being electrically and thermally connected to one end of the collection portion.