Battery pack for a vehicle and methods and systems for making the same
Embodiments include a method for creating a battery pack for a vehicle. Aspects include receiving a plurality of battery cells, measuring an internal resistance level for each of the plurality of battery cells, and creating, based at least in part on the internal resistance level for each of the plurality of battery cells, a plurality of groups from the plurality of battery cells. Aspects also include connecting each of the plurality of battery cells in each of the plurality of groups in parallel and connecting each of the plurality of groups in series.
1 . A method for creating a battery pack for a vehicle, the method comprising:
receiving a plurality of battery cells;
measuring an internal resistance level for each of the plurality of battery cells;
creating, based at least in part on the internal resistance level for each of the plurality of battery cells, a plurality of groups from the plurality of battery cells;
connecting each of the plurality of battery cells in each of the plurality of groups in parallel; and
connecting each of the plurality of groups in series, wherein creating the plurality of groups from the plurality of battery cells includes ordering the plurality of battery cells by the internal resistance level for each of the plurality of battery cells and selecting a number of adjacently ranked battery cells as a group.
2 . The method of claim 1 , wherein at least one of the plurality of battery cells is not included in any of the plurality of groups.
3 . The method of claim 2 , wherein the at least one of the plurality of battery cells includes a battery cell of the plurality of battery cells having a highest internal resistance level and a battery cell of the plurality of battery cells having a lowest internal resistance level.
4 . The method of claim 1 , wherein the plurality of groups from the plurality of battery cells are created such that a standard deviation of the internal resistance level for each of the plurality of groups is minimized.
5 . The method of claim 1 , wherein each of the plurality of groups includes a same number of battery cells.
6 . The method of claim 1 , wherein creating a group of the plurality of groups includes placing the plurality of battery cells corresponding to the group adjacent to one another.
7 . A method for creating a battery pack for a vehicle, the method comprising:
receiving a plurality of battery cells;
measuring an internal resistance level for each of the plurality of battery cells;
creating, based at least in part on the internal resistance level for each of the plurality of battery cells, a plurality of groups from the plurality of battery cells;
connecting each of the plurality of battery cells in each of the plurality of groups in parallel;
connecting each of the plurality of groups in series; and
placing a group of the plurality of groups that has a highest internal resistance in a center of the battery pack.
8 . The method of claim 7 , wherein at least one of the plurality of battery cells is not included in any of the plurality of groups.
9 . The method of claim 8 , wherein the at least one of the plurality of battery cells includes a battery cell of the plurality of battery cells having a highest internal resistance level and a battery cell of the plurality of battery cells having a lowest internal resistance level.
10 . The method of claim 7 , wherein the plurality of groups from the plurality of battery cells are created such that a standard deviation of the internal resistance level for each of the plurality of groups is minimized.
11 . The method of claim 7 , wherein each of the plurality of groups includes a same number of battery cells.
12 . The method of claim 7 , wherein creating a group of the plurality of groups includes placing the plurality of battery cells corresponding to the group adjacent to one another.
13 . A method for creating a battery pack for a vehicle, the method comprising:
receiving a plurality of battery cells;
measuring an internal resistance level for each of the plurality of battery cells;
creating, based at least in part on the internal resistance level for each of the plurality of battery cells, a plurality of groups from the plurality of battery cells;
connecting each of the plurality of battery cells in each of the plurality of groups in parallel;
connecting each of the plurality of groups in series; and
placing a group of the plurality of groups that has a lowest internal resistance at an edge of the battery pack.
14 . The method of claim 13 , wherein at least one of the plurality of battery cells is not included in any of the plurality of groups.
15 . The method of claim 14 , wherein the at least one of the plurality of battery cells includes a battery cell of the plurality of battery cells having a highest internal resistance level and a battery cell of the plurality of battery cells having a lowest internal resistance level.
16 . The method of claim 13 , wherein the plurality of groups from the plurality of battery cells are created such that a standard deviation of the internal resistance level for each of the plurality of groups is minimized.
17 . The method of claim 13 , wherein each of the plurality of groups includes a same number of battery cells.
18 . The method of claim 13 , wherein creating a group of the plurality of groups includes placing the plurality of battery cells corresponding to the group adjacent to one another.