{"id":24074623,"url":"https://github.com/johassel/exo_battery_sizing","last_synced_at":"2025-09-09T14:04:09.668Z","repository":{"id":269569589,"uuid":"863460771","full_name":"JoHassel/Exo_Battery_Sizing","owner":"JoHassel","description":"Dimensioning of a LFP battery for a 4-DOF Lower Limb Exoskeleton (TU Berlin RISE WiSe 23/24)","archived":false,"fork":false,"pushed_at":"2024-12-30T19:09:53.000Z","size":202,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":1,"default_branch":"main","last_synced_at":"2025-01-09T18:19:13.040Z","etag":null,"topics":["battery-simulation","exoskeleton","lithium-ion-battery"],"latest_commit_sha":null,"homepage":"","language":"MATLAB","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"cc0-1.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/JoHassel.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2024-09-26T10:34:16.000Z","updated_at":"2024-12-30T19:09:55.000Z","dependencies_parsed_at":"2024-12-24T14:50:03.033Z","dependency_job_id":null,"html_url":"https://github.com/JoHassel/Exo_Battery_Sizing","commit_stats":null,"previous_names":["johassel/exo_battery_sizing"],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/JoHassel%2FExo_Battery_Sizing","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/JoHassel%2FExo_Battery_Sizing/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/JoHassel%2FExo_Battery_Sizing/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/JoHassel%2FExo_Battery_Sizing/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/JoHassel","download_url":"https://codeload.github.com/JoHassel/Exo_Battery_Sizing/tar.gz/refs/heads/main","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":240943949,"owners_count":19882484,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["battery-simulation","exoskeleton","lithium-ion-battery"],"created_at":"2025-01-09T18:19:18.650Z","updated_at":"2025-02-26T22:26:59.615Z","avatar_url":"https://github.com/JoHassel.png","language":"MATLAB","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Exoskeleton Battery Sizing\nDimensioning of a LFP battery for a 3-DOF Lower Limb Exoskeleton\n\n## Introduction\nThe purpose of the Matlab simulation was to calculate the capacity and power of the battery. The data base are trajectories for five different modes: Walking, Stairs-up, Stairs-Down, Sit-to-stand, Stand-to-sit.\n\n## Structure\n1.\tImport parameters\n2.\tExtract trajectory data from scientific literature with [DataThief](https://www.datathief.org/)\n3.\tImport trajectories (either rpm and torque trajectories or mechanical power)\n4.\tIf rpm and torque imported: calculate mechanical power in W/kg\n5.\tGet absolute values of mechanical power and add second leg (50% offset for walking, stairs-up and stairs-down)\n6.\tCalculate efficiency for motor based on rpm vs. efficiency over cycle (see plots)\n7.\tCalculate electrical power for each mode\n8.\tOutputs: Average power based on load collective, max. current based on peak power, capacity based on average power and running time\n\n9. Average current for each actuator\n10. Peak power reduction through supercaps \n\n## Results\nThe following graph shows the power of the exoskeleton for the different modes:\n\n\u003cfigure\u003e\n  \u003cimg src=\"Images/power_different_modes.png\" width=70%\u003e\n  \u003cfigcaption\u003eFig.1 - Power over Cycle \u003c/figcaption\u003e\n\u003c/figure\u003e \n\n\u003cbr\u003e\n\u003cbr\u003e\n\u003cbr\u003e\n\nThe following results define the specs for the battery. It has to be noted that the high current results from the high torques in the stand-up and stairs-up mode. This torque can be reduced in practice by lowering the speed of the movements. (Movement speed of the trajectories was almost healthy human speed)  \n\n\u003cbr\u003e\n\n| Battery Parameter |\tValue | Unit |\n| ----------- | ----------- | ----------- |\n| Capacity\t| 661.6\t| Wh\t|   \n| Capacity\t| 13.8\t| Ah\t| \n| Max. Current\t| 82.5\t| A\t| \n\n\u003cbr\u003e\n\nThe final decision was to use two times the [48V, 10Ah, 30A LFP Battery](https://www.akkushop-24.de/Lithium-Ionen-Akkupack-12V-15Ah-15A_13) with one battery for each leg. \n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjohassel%2Fexo_battery_sizing","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjohassel%2Fexo_battery_sizing","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjohassel%2Fexo_battery_sizing/lists"}