Health Indicator Algorithm
Low-spec CPU: Uses the current accumulation method / Accuracy of current sensor is important
High-end CPU: Uses EKF (Extended Kalman Filter) algorithm / Takes a lot of time for experimentation and verification
SOC (State Of Charge) - Battery charge level
SOH (State Of Health) - Remaining battery life
Low-spec CPU: Using the current-carrying method / Lifespan estimation method using lightweight machine learning developed by our company
High-Use CPU: Uses EKF algorithm
EOL ( End Of Life )
Even if the battery has remaining life left, it is necessary to estimate whether it can be reused through various condition diagnoses.
In addition to cell balancing status and aging by EIS measurement, it is necessary to detect defects in other parts.
EIS BMS
Electriochemical Impedance Spectroscopy
A method to interpret the impedance value that reacts by injecting current at different AC frequencies into a battery by mapping it to a Nyquist Plot graph.
It is being used as a technology to diagnose waste batteries or as a technology to inspect defects during battery production.
Study on battery failure pattern classification based on decision tree
We are conducting research with universities to analyze EIS data to detect internal battery structural deformation points, pre-detect thermal runaway, and analyze various failure patterns such as overcharge, overdischarge, and plating.
Power Bank BMS
10 cells or less - low cost BMS
Battery packs used in the long-tail market with a voltage range of less than 48V, mainly used in golf carts, power banks for camping cars, cleaning vehicles, AGVs, electric motorcycles, etc.
Over 10 cells - Medium BMS
It is used for special purposes with a voltage range of less than 100V, and is mainly used in high-capacity power banks or electric motorcycles, forklifts, excavators, etc.
High-end BMS
It is used when the voltage range is 100V or higher, multiple AFE ICs are configured, and the number of cell channels is tens of cells. It is mainly used in ESS, EV, etc.
ESS BMS
TRAY(Module) BMS
This is a BMS that manages battery module units, and it has a built-in AFE IC. Depending on how the number of cell channels is configured, it is in the tens of cell units. In this case, as many as 4 to 5 AFE ICs are built-in. In the case of TRAY BMS, it is important to minimize power consumption because it is driven by the voltage of the module, and in the case of LFP, since it has a high capacity compared to the NCM battery capacity, if balancing between cells is required, it cannot be solved with passive balancing, so an active balancing circuit configuration is required.
RACK BMS
This is a unit that consists of N battery modules, which are connected to the PCS as a single PACK unit. It is installed inside the BPU (Battery Protection Unit) of each RACK and is the core BMS that manages the entire RACK. In addition to monitoring battery cell voltage, pack voltage, temperature, current, etc., it also performs SOC, SOH algorithms, cell balancing, and heat management.
Master(BANK) BMS
1 Bank is a BMS that manages RACK BMS and PMS communication, with RACK connected in units of several to several dozen. CAN or Ethernet communication is used for communication with RACK, and optical communication or Ethernet communication is used with PMS. 1 PCS and 1 BANK are configured as one ESS unit, and Master BMS monitors the status of RACK and manages 1 BANK according to the command of PMS during operation.
BMS Ceritifcation
Domestic certification
KC62619 was only applicable to ESS products, but from March 20, 2024, it was expanded to include power banks.
In the case of reuse batteries, the 'proven special case' system ended and they became items subject to KC62619 functional safety.
Overseas Certification
- USA
Select 1 from UL60730-1 or UL61508 or UL991/UL998
- europe
Select one of IEC60730-1 or IEC61508
