Battery packs with cell module assemblies usable in multiple applications
A cell module assembly includes multiple lithium-ion battery cells connected in parallel and an electronic controller. The electronic controller is programmed to receive useful life data for a useful life indicator of the battery cells, save the life data to memory to create a life data history, determine a life measurement based on the life data history, compare the life measurement to a first end of life threshold, determine if the life measurement has met the first end of life threshold, provide a first end of life output indicating that the life measurement has met the first end of life threshold, compare the life measurement to a second end of life threshold, determine if the life measurement has met the second end of life threshold, and provide a second end of life output indicating that the life measurement has met the second end of life threshold.
1. A method of evaluating a cell module assembly, comprising:
collecting, by an electronic controller, useful life data for a cell module assembly;
storing, by the electronic controller, the useful life data collected for the cell module assembly;
determining, by the electronic controller, a useful life measurement for the cell module assembly based on the useful life data;
comparing, by the electronic controller, the useful life measurement for the cell module assembly to a first end of life threshold;
determining, by the electronic controller, that the useful life measurement for the cell module assembly is greater than or equal to the first end of life threshold;
in response to determining that the useful life measurement for the cell module assembly is greater than or equal the first end of life threshold, removing the cell module assembly from service for a first life application; and
determining that the cell module assembly is suitable for a second life application in response to determining that the useful life measurement of the cell module assembly is greater than or equal to the first end of life threshold and determining that the useful life measurement for the cell module assembly is less than or equal to a second end of life threshold.
2. The method of claim 1 , further comprising:
following determining that the useful life measurement for the cell module assembly is greater than or equal the first end of life threshold, comparing the useful life measurement for the cell module assembly to a second end of life threshold;
determining that the useful life measurement for the cell module assembly is greater than or equal to the second end of life threshold; and
in response to determining that the useful life measurement for the cell module assembly is greater than or equal the second end of life threshold, removing the cell module assembly from service of the second life application.
3. The method of claim 2 , wherein the second end of life threshold is less than the first end of life threshold.
4. The method of claim 1 , wherein the useful life data comprises at least one of a charge capacity, time passed since commissioning the cell module assembly, a number of charge cycles since commissioning the cell module assembly, a depth of a charge cycle, a number of coulombs supplied by the cell module assembly, a number of times the cell module assembly was operated during extreme weather conditions, a measurement of the current supplied to charge the cell module assembly, a measurement of the voltage supplied to charge the cell module assembly, and a measurement of the voltage supplied by the cell module assembly.
5. The method of claim 4 , further comprising collecting and storing useful life data throughout a life of the cell module assembly.
6. The method of claim 4 , further comprising storing a portion of the useful life data temporarily and discarding the portion of the useful life data after a predetermined period of time.
7. The method of claim 1 , further comprising collecting the useful life data for each individual battery cell when the cell module assembly comprises a plurality of individual battery cells.
8. The method of claim 1 , further comprising comparing, by a diagnostic tool the performance of the cell module assembly with a different cell module assembly based on the useful life data of the cell module assembly and the different cell module assembly.
9. The method of claim 1 , wherein the first life application includes at least one of a riding lawn mower and a commercial lawn mower.
10. The method of claim 1 , wherein the second life application includes at least one of a push lawn mower, a gardening equipment, an aerial man lift, a home energy storage system, a floor cleaner, and an industrial utility vehicle.
11. A method of manufacturing a battery pack, comprising:
providing a battery pack including a plurality of cell module assemblies and an electronic controller;
receiving a first end of life output from the electronic controller;
removing the battery pack from service; and
categorizing the cell module assemblies based on useful life data saved to the electronic controller into a first plurality of returned cell module assemblies suitable for use in a first suitable second life application and a second plurality of returned cell module assemblies suitable for use in a second suitable second life application.
12. The method of claim 9 , further comprising:
combining the first plurality of returned cell module assemblies with a plurality other similarly categorized cell module assemblies to form a second battery pack for use in the first suitable second life application.
13. The method of claim 11 , further comprising:
combining the second plurality of returned cell module assemblies with a plurality other similarly categorized cell module assemblies to form a third battery pack for use in the second suitable second life application.