Single cell fault tolerant battery system architecture
A battery system may include multiple battery cells grouped into modules. Each battery module may have a diffuser plate to direct the hot gases and molten material that are ejected during cell failure. The gas and material may be directed away from the nearest neighboring cells in the event of a single cell thermal runaway. Residual thermal energy is wicked away, absorbed or contained to keep heat away from the neighboring cells. These and other features may manage the blast energy and residual thermal energy of a single cell failure event. This may prevent a cascading failure of the larger battery system, thereby mitigating the risk of injury to personnel and property.
1. An apparatus for preventing battery failure, comprising:
a plurality of lithium ion electrochemical cells, wherein each of the plurality of the lithium ion electrochemical cells is configured to generate electrical energy from chemical reactions, each of the plurality of the lithium ion electrochemical cells comprising a respective first end and a respective second end, wherein each respective first end comprises a respective vent, wherein each of said plurality of lithium ion electrochemical cells is aligned along parallel axes with each other of said plurality of lithium ion electrochemical cells with each said respective first end in a first direction, and each said respective second end in a second direction;
a first bus electrically coupled to respective first electrodes of each of said plurality of lithium ion electrochemical cells at said respective first end;
a second bus electrically coupled to respective second electrodes of each of said plurality of lithium ion electrochemical cells at said respective second end;
a diffuser plate juxtaposed with said first bus at said respective first end, wherein the diffuser plate is aligned with a plane normal to the parallel axes, the diffuser plate comprising a first side facing the respective first ends and a second side facing away from the respective first ends, the diffuser plate comprising channels for venting gas on said first side, the diffuser plate further comprising a plurality of diverters, each diverter including at least one arc protruding from said first side and at least one gap, wherein each arc comprises a curved cross-section oriented parallel to the diffuser plate alignment, wherein the gaps in the diverters form the channels for venting gases;
a heat sink layer juxtaposed with one of said first bus and said second bus; and
a third bus electrically coupled to respective second electrodes of each of said plurality of lithium ion electrochemical cells at said respective second end, wherein the heat sink layer is interposed between the second bus and the third bus.
2. The apparatus of claim 1 , wherein:
said plurality of lithium ion electrochemical cells comprises at least two lithium ion electrochemical cells.
3. The apparatus of claim 1 , further comprising:
a foam cell support comprising a plurality of tubes each of which holds one of said plurality of lithium ion electrochemical cells in a spaced-apart relationship relative to others of said plurality of lithium ion electrochemical cells.
4. The apparatus of claim 3 , wherein:
said foam cell support comprises polyurethane.
5. The apparatus of claim 1 , further comprising:
a first glass epoxy composite material interposed between said first bus and each of said plurality of said lithium ion electrochemical cells at said respective first end and
a second glass epoxy composite material interposed between said second bus and each of said plurality of said lithium ion electrochemical cells at said respective second end.
6. The apparatus of claim 5 , wherein:
said first glass epoxy composite material comprises G10; and
said second glass epoxy composite material comprises G10.
7. The apparatus of claim 1 , wherein: said heat sink layer comprises a phase change material.
8. The apparatus of claim 1 , further comprising: a fuse interposed between the second bus and the third bus.
9. The apparatus of claim 1 , further comprising:
a fuse coupled to one of said first bus and said second bus.
10. The apparatus of claim 1 , wherein:
said first bus comprises at least one of nickel, aluminum and copper; and
said second bus comprises at least one of nickel, aluminum and copper.
11. The apparatus of claim 1 , wherein:
each diverter is located directly above one lithium ion electrochemical cell.
12. The apparatus of claim 1 , wherein:
the diverter gaps are arranged to divert vented gases in a direction that does not directly face any other neighboring lithium ion electrochemical cell.
13. The apparatus of claim 1 , wherein:
The diffuser plate includes overflow chambers configured to accommodate swelling of the plurality of lithium ion electrochemical cells and molten debris collection.
14. The apparatus of claim 1 , further comprising:
a third bus electrically coupled to respective second electrodes of each of said plurality of lithium ion electrochemical cells at said respective second end, the third bus including a group fuse component.