ENEPAQ - Model VTC5A - Sony/Murata Li-ion Battery Module
Enepaq Battery Modules are a unique blend of latest battery technology, safety and ease of use. Each Battery Module is made of several 3.6V 18650 Li-ion cells connected in parallel. Several such blocks may be connected in parallel and series to form high voltage Battery Packs of various shapes and sizes. Even though a cylinder may seem as not effective use of space at a first glance, the internal conductors are very tightly rolled and often offer higher energy density per volume and weight than competition, even per whole pack, counting in the air gaps among cylinders. No need for compression plates gives yet another way to save some space and weight. Resulting air gaps also offer an opportunity of easy and effective thermal management solution, either by liquid or air.
SAFETY
18650s are housed in a self-contained metal shell, which requires no special treatment, like mechanical compression used for pouch cells, or swell compensation used for pouch and prismatic cells, which complicates overall design and construction of Battery Pack.
Each cell is also equipped with a bimetallic fuse and a pressure release valve to manage critical events such as short circuit or mechanical damage, on top of already robust metal shell.
In addition to internal protection techniques, the module includes two fuses for each cell. These act as a second level protection devices in case of cell failure. In case of cell venting, released gas is travelled through dedicated channels to avoid pressure buildup.
QUALITY
Due to long history and well established manufacturing techniques, these cells offer very high quality and almost unbelievably low fail rates of only 0.01 per million, which becomes very important when battery pack is built from thousands of cells.
Stable manufacturing process leads to high tolerances and low parameter deviation. Typically cells measure below 3mV of voltage difference even after years in storage, which means very little maintenance and balancing is needed. This allows the use of cost-effective and reliable battery management systems with low balancing current: 5mA bleeder on a 200Ah pack is often acceptable. This also means that all Battery Modules made by are in perfect balance once delivered. In contrary, initial balancing of poor quality cells may take weeks or even months, usually asking for special equipment for initial conditioning of battery pack.
FLEXIBILITY
Due to simple nature of these building blocks, desired battery pack configuration can be built in minutes, connecting them in series and parallel using bolt connections. Even MWh-scale batteries can be assembled with ease.
• Small size: 206-357 Wh per liter
• Low weight: 157-164 Wh per kg
• Individually fuse-protected cells
• Integrated temperature sensors with JST 2 pin-XH connection
• Ultra low and equal self-discharge
• Rapid prototyping of battery pack
• Convenient thermal control
• Built-in temperature sensors
• UL94-V0 rated, fire-retardant plastics
• Specific design based on air cooling
• UN38.3 certified
Each Battery Module comes with various options:
- Single row or double row
- Cell count up to 10 per row
- Optional multi-point temperature sensor
- Various 18650 cell models
APPLICATIONS
- Electric Formula SAE Student
- Performance electric vehicles
- Autonomous Robotics
- Electric Bikes
- Electric Bicycles
- Electric Scooters
- Special purpose machines
- Golf Carts
- Go Carts
- Backup energy storage