Supports multiple cell chemistries including Lithium Iron Phosphate Energy and Power, Nickel Cobalt Aluminium and Nickel Manganese Cobalt.....
Battery Management is the single biggest challenge facing the Electric Vehicle (EV) and Hybrid Electric Vehicle (HEV) market as it affects all aspects of vehicle performance. One of the greatest challenges that Ashwoods Automotive faced during the development of the Hybrid Drive technology was the lack of effective battery management. There are no Battery Management Systems (BMS’s) available on the market that can effectively manage Lithium batteries on a demanding hybrid drive cycle.
Most BMS’s are designed for applications which provide a relatively long calibration phase for the battery at the end of the charge cycle during which the balancing can occur (EV charge 6 to 8 hours).
In a micro cycling hybrid application the balance during charge opportunities are significantly shorter (a few minutes maximum). The battery pack capacity used in HEV’s is smaller than EV’s and operates at higher Charge and Discharge rates relative to the capacity for shorter durations; therefore keeping the energy state between cells well balanced is critical for HEV operation.
An out of balance battery severely degrades HEV performance as it reduces the already minimal usable capacity of the battery thereby restricting the energy throughput of the hybrid system.
The results have been impressive: 150 Ashwoods Hybrid vehicles with proprietary BMS have covered over 500,000 miles presently. Data received from these vehicles has been crucial for the further development of the Ashwoods BMS. No other BMS supplier has access to this level of detailed real world data
Ashwoods Energy BMS is designed for short time constant balancing in a micro cycle environment which requires high power balancing. This is ideally suited to enhance regenerative braking energy recovery in EV’s.
The BMS contains an intelligent balancing algorithm which manages available energy based on Battery State of health and likely future balancing/ charging events. This allows the vehicle to utilise the maximum energy available from the battery for a given drive cycle whilst maintaining pack balance within the range of optimal functionality.
Rapid communication between BMS modules within the pack ensures that all modules are working in harmony to achieve best possible balance state throughout short balance events.
The Ashwoods Energy BMS is powered from Vehicle 12V bus rather than battery pack to avoid storage discharge issues. All communications with the BMS are isolated and common to Vehicle GND to ensure a safe installation.
The BMS is able to balance battery packs during charge by energy dissipation from fullest cells and during discharge by energy supply to weakest cells within the pack.
The BMS has already proven itself to be are superior to all others tested in real world applications.
Furthermore, Ashwoods is working with a number of HEV and EV suppliers who are experiencing problems with their current battery pack solution and are seeking alternatives.
As such, Ashwoods Energy will be supplying its technologies in two forms to a range of industry partners:
Ashwoods Energy’s products are designed specifically to achieve mass market acceptance for the products from a price and performance perspective.
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