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Bafang Extends Battery Portfolio

Sales & Trends

Bafang Extends Battery Portfolio
Bafang’s new Intube BT F09 for M800 drivetrain offers 430Wh. – Photo Bafang

WIJCHEN, the Netherlands – Bafang, one of the leading manufacturers of e-mobility components and complete drive systems, expands its battery collection for e-bikes with the introduction of two new models for down tube applications, BT F07.450.C and BT F08.600.C, offering 450Wh or 600Wh respectively.

With these two new versions Bafang can now also offer an in-house solution for customers looking for downtube or other positions of a battery. Besides it is still possible to implement Bafang’s so-called “open system” which allows the combination of motors, controllers, sensors, displays and batteries from different (Bafang) series or even other suppliers. Due to their multitudinous development team of more than 40 engineers, Bafang can support its customers by securing perfect interaction between all those components.

Both new battery versions, complementing now a range of nine battery types and sizes, apply the same design and main technical features:

  • Premium battery cells (type 18650)
  • Semi-integration into the frame’s downtube
  • Demounting sideways (to the left)
  • Charging on/off the bike – with two charger options to choose from (2A/3A charging current)
  • Capacity indicators (LED) on top of the battery
  • Production colour: black with optional decals

What also new for batteries at Bafang is the Intube BT F09 for the M800 drivetrain. This is a larger cousin of the current 200Wh BT F05. The BT F09 offers 430Wh. Its low-profile design and 2.3kg makes it a perfect battery for eRoad or eGravel bikes. The new batteries will be available for Bafang OE customers as of Q4 2019.

Other news that Bafang presents at Eurobike on stand A1-304 is the new 43V battery design. With it the e-bike drivetrain system maker distinguishes itself from others that only have batteries in 36 or 48V formats. Bafang’s engineers have decided to use the 43V design for some very good reasons:

Advantage 1: Heat Efficiency

For batteries of the same capacity, the higher the voltage, the higher the working efficiency and the longer the range. When providing the same output power, the higher voltage leads to a lower working current, thus the battery and other components of the system produce less heat – and the efficiency will be improved accordingly.

When compared to the most commonly used 36V format, a 43V battery experiences just 69% of a 36V system’s heat loss. In terms of efficiency, a 48V battery is even better, at 59%, but has a disadvantage when it comes to space utilization.

Advantage 2: Compact Module Arrangement

Depending on the capacity required, a 43V battery uses a 12S3P, 12S4P or 12S5P cell arrangement, resulting in a space utility of 75% for the complete package. Both competing formats are considerably less space-efficient. A 36V battery’s 10S4P or 10S5P arrangement only manages 63% space utility, a 48V battery’s layout (13S3P, 13S4P or 13S5P) reaches no more than 65% – plus, that “high-end” 48V battery leads to a very wide package which conflicts in particular with the requirements of state-of-the-art downtube integrated batteries.

“When you take both of these efficiency parameters into account, there’s a clear overall advantage to the 43V battery design”, said Sunny He, Bafang’s director and deputy general manager. “And our latest battery options also have many additional advantages:”

Advantage 3: Safety

Users of Bafang’s new battery packs benefit from improved resistance against bad weather and high thermal stress – because the batteries are designed in accordance with the IPX6 standard, and their smart thermal management restricts any possible temperature rise to 20 degrees. But there are also many even more sophisticated features and technologies implemented:

  • Higher safety protection design: Bafang’s charging circuit is equipped with independent temperature control. All important functions are identified before charging. The charging circuit has been designed with 6 circuits for safety protection.
  • Low voltage design: All batteries rely on the safer 4.1V full voltage level (instead of the standard 4.2V)
  • Multi-stage failure safety protection: Bafang’s BMS (Battery Management System) uses 2 circuits to protect the chip against overcharge failure of the circuit and another 2 circuits to independently double-check for temperature protection failure. A real-time calibration system checks for discharge overcurrent.
  • Independent 3-section fuses provide enhanced secure diagnosis of real-time MOSFET status, ensuring reliable on and off of the entire battery
  • Two-level safety mechanism protective design: After unlocking by key, there’s two-stage hook protection. A spring plate mechanism also facilitates attachment.

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