Bicycle Battery Case 21700 Cells (4S1P) Velcro Strap
Print Profile(1)
Description
Boost Me (for free)
"Did the case help you with your battery build? Then feel free to leave me a Boost so I can develop even more practical bike accessories in the future!"
Overview
Robust, functional case for a 4S1P 21700 Li-Ion battery (optimized for LG INR21700-M50LT). This design was specifically developed for bicycle mounting and offers integrated holders for fastening straps as well as space for safety electronics.
Features
- Secure Mounting: Integrated holders left and right for Velcro straps.
- Optimal Insulation: The design allows space for additional insulating layers between the BMS and cells.
- Capacity Indicator: Precisely fitting cutout for a 2S-8S LCD display module to monitor the charge level.
- Durable: Use of M2 heat-set inserts for frequent opening and closing without plastic wear.
- T-Dean Cutout: Precisely fitting opening for the classic model building connector.
Required Hardware
- Cells: 4x 21700 Li-Ion (e.g., LG INR21700-M50LT).
- BMS: 4S 14.8V / 16.8V 20A Peak Li-ion Protection Board (Link).
- Display: 2S-8S Battery Capacity Indicator (LCD Module) (Link).
- Connector: T-Dean (Deans) Connector.
- Screws: 4x M2 x 10mm (hex socket recommended).
- Threads: 4x M2 heat-set inserts.
- Attachment: Velcro straps/bands for frame mounting (Link).
- Insulation: Kapton Tape for fixation and heat insulation.
- Epoxy Glass Plates / Insulation Mats for physical separation of BMS and battery pack (Link).
Assembly Note
To avoid short circuits and heat transfer, epoxy glass plates were used in the example shown to safely insulate the BMS from the battery pack. All cable routes should also be secured with Kapton Tape.
Print Settings
- Material: PETG or ASA/ABS (due to UV resistance and heat on the battery).
- Support: Tree support for the side mounts and the lid overhang.
⚠️ Safety Note
Building lithium batteries requires expert knowledge. Pay meticulous attention to insulation (as solved in the project with epoxy glass plates and Kapton Tape). A short circuit can lead to a fire hazard!
License
You may create derivative works based on this object, provided that all such derivative works are published exclusively on the MakerWorld platform and include proper attribution to the original creator. You may not share, upload, host, distribute, or publish this object—or any derivative work of this object—on any other digital platform, marketplace, or distribution channel. Commercial use of this object and any derivative works is strictly prohibited. This includes, but is not limited to, selling, renting, sublicensing, or using the object in any context in which you receive monetary compensation or other financial benefits.
Comment & Rating (0)