Good BMS for Good Rechargeable Batteries
BATTERY MANAGEMENT SYSTEM
How And What
These new chemical processes as described, are very delicate (fires and explosions are actually advertised also in China to combat poor quality), and to a greater extent are those Lithium Polymer (Li-po or Litiopolymer) that Minimal Powertrain AG has chosen today not to use.
Performance and durability of these rechargeable batteries advanced technology, are strongly influenced by environmental and operational conditions as well how they occur the charging and discharging phases in their life cycle, so it is always necessary to equip them with electronic devices so that they are properly protected, managed and controlled.
Without an adequate quality electronics is impossible to have sufficient guarantees that the accumulator of electric charge may have really a life that is as close as possible to the nominal values stated in the data sheet and in accordance with the terms of the warranty.
Among the 9 functions typically performed by these PCBA calls BMS (Battery Management System): Cells Protection, Cell Balancing, Phase Charge Control, Status of Charge, Status of Health, Accessories Loads Management, Monitoring and Recording of the History of Use , Traceability Battery, Doors for data exchange and checking, some have vital value and others are essential to the specific use and after-sales service.
The protection against short-circuit events as from a possible over-charging and over-discharging that can destroy cells making it unusable the electric accumulator are therefore to be considered essential standards, but lacking a good balance of power cells is not possible to guarantee stable and long-term performance, as well as without the historical function (Log Book), to understand what and to whom is due the unusual failure.
A lithium-ion battery completely discharged is considered irrecoverable and this is the reason why the state of charge (SOC) is monitored and maintained above the minimum target of 25% and in some cases to levels much higher.
For the lack of a function that manages the accessories loads, you can also find themselves by foot with the immovable vehicle as happened on premium cars of leaders in the field, so that, even if certain features are worth the adjective smart in these PCBA , does not really constitute “marketing” but “need”.
It should also be said that with equal functionality, the BMS are more or less sophisticated and accurate in their ability to perform them, as well as to exchange information with other on-board devices and/or remote.
An important note must be made with regard to the correct handling of “generation of power on board the vehicle” in relation to the potential possibility to confer it to the electric accumulator, since this additional power may be acquired only if, as is for its external charging device, the process is carried out in accordance with the technical specifications and under the premise of the existence of an SOC that allows it.
This requires an additional electronic component specifically dedicated, integrated on board the BMS or on the PCBA designed for the “actuating of the electric machine”.
Minimal Powertrain AG takes care in any case that the rechargeable battery pack is high performance so, in according to its the sizing, to equip the electric energy tank with the more suitable BMS, optimizing the cost / quality ratio.
Smart BMS NCM e LFP 16S-25a Cells