Modular Battery Pack for E-Bikes: A Promising Concept
A modular battery pack for electric bicycles (e-bikes) with individual units like you described (210mm x 100mm x 60mm, 150Wh) is an interesting concept with several potential benefits:
Advantages:
* Scalability: Riders can adjust the battery capacity to their needs. For a short commute, one unit might suffice, while longer rides could benefit from two or even three units connected together.
* Range Extension: A depleted unit can be easily swapped for a fully charged one, extending the e-bike's range without waiting for a full recharge.
* Weight Management: Riders can choose to carry only the necessary battery power, reducing overall weight for performance-oriented rides.
* Modularity: Damaged units can be replaced individually, potentially reducing repair costs.
Technical Considerations:
* Standardization: The design of the units and connection system would need to be standardized to ensure compatibility between different units and e-bike models.
* Battery Management System (BMS): A sophisticated BMS would be crucial to manage individual units, including monitoring voltage, current, temperature, and ensuring balanced charging and discharging across all connected units.
* Connection System: The connection between units should be secure, weatherproof, and easy to use for swapping batteries on the go.
* Safety: Strict safety measures need to be implemented to prevent electrical hazards during connection and disconnection.
Existing Solutions:
While a fully modular system like you described isn't yet mainstream, there are existing solutions that share some similarities:
* Dual Battery Packs: Some e-bikes allow connecting two pre-built battery packs for extended range.
* Frame-Integrated Batteries: Several manufacturers are integrating batteries into the e-bike frame, offering a sleek design but sacrificing modularity.
Overall, a modular battery pack system has the potential to be a game-changer for e-bikes. However, significant technical challenges need to be addressed to ensure a safe, reliable, and user-friendly experience.

a possible design for a modular e-bike battery specifications:
Modular E-Bike Battery (150Wh)
Dimensions:
* Length: 210mm
* Width: 100mm
* Thickness: 60mm
Design:
* Case: The outer casing is made of a strong, lightweight material like aluminum or high-impact plastic. It should be designed to be water-resistant and able to withstand bumps and shocks.
* Color: A bright color scheme, like black with green accents, would enhance visibility and make it easy to identify on the e-bike.
* LED Indicators: LED lights on the front face could display the remaining battery charge level.
* Mounting System: The back could have a built-in mounting plate with a secure locking mechanism for attachment to the e-bike frame (specific design would depend on the e-bike model).
* Connection Port: A weatherproof, secure connection port on the side allows for connecting multiple units together or to the e-bike's electrical system.
Internal Components:
* Lithium-Ion Battery Cells: The core of the unit would be high-quality lithium-ion battery cells known for their energy density and long lifespan.
* Battery Management System (BMS): A compact BMS would be integrated to monitor cell voltage, current, temperature, and ensure balanced operation during charging and discharging.
Additional Considerations:
* Safety Features: The battery should have built-in safety features like overcharge and over-discharge protection, as well as thermal management to prevent overheating.
* Carrying Case (Optional): A separate carrying case could be offered as an accessory for easy transportation of spare batteries.
This is just a conceptual design, and the actual implementation might vary depending on the manufacturer's choices and specific e-bike compatibility.