IMWTEK UK1R1N06LFH vs. Infineon BSC060N10NS Failure Modes and Rapid Shutdown Solutions Showdown
1、 Application scenarios and technical challenges
The battery management system (BMS) of the energy storage system needs to protect the lithium battery pack from faults such as short circuit and overcurrent. The MOSFET in its active balancing protection circuit faces the following challenges:
Short circuit tolerance: When the battery pack is short circuited, the current can reach thousands of amperes, and the MOSFET needs to be safely turned off within a few milliseconds.
High temperature stability: The internal temperature of outdoor energy storage cabinets can reach up to 85 ° C, and devices are prone to thermal runaway at high temperatures.
Safety certification: UL 1741 standard is required to ensure rapid isolation of the battery pack in case of malfunction.
The LFPAK (Loss Free Package) package is an ideal choice for BMS protection MOSFETs due to its low thermal resistance and high current density.
2、 Product comparison: IMWTEK UK1R1N06LFH vs. Infineon BSC060N10NS
Parameter IMWTEK UK1R1N06LFH Infineon BSC060N10NS Advantage Analysis
Encapsulation LFPAK 5 × 6mm LFPAK 5 × 6mm Same Package Benchmarking
Voltage level: 60V, 100V, 60V, suitable for 48V battery pack with remaining capacity requirements
RDS (on) @ 10V 0.6m Ω 0.75m Ω reduces conduction loss by 20%
Short circuit withstand time 12ms 8ms allows for a longer fault response window
Thermal resistance R θ JC 0.8 ° C/W 1.2 ° C/W Crust temperature difference reduced by 33%
Avalanche energy EAS 150mJ 100mJ, anti reverse voltage surge capability increased by 50%
3、 Practical Test: Verification of Short Circuit Protection for Lithium Battery Pack
Testing Platform:
Battery pack configuration: 48V/100Ah lithium iron phosphate battery, internal resistance<2m Ω
Fault simulation: Hard short circuit (resistance 0.1m Ω), initial current 5000A
Protection circuit: MCU based fast shutdown (response time<2 μ s)
Test project:
Short circuit withstand: Temperature and failure mode of MOSFET under 10ms short circuit current.
Shutdown performance: Drive circuit response time and peak drain voltage.
Aging test: parameter drift after 1000 short circuit cycles.
Test results:
Short circuit withstand:
IMWTEK UK1R1N06LFH: After a short circuit of 10ms, the junction temperature was 210 ° C (without breakdown), while the Infineon solution experienced thermal failure at 8ms (junction temperature>250 ° C).
Failure analysis (Figure 1): Infineon chips form short-circuit channels due to local melting, and IMWTEK avoids hotspots by uniformly dissipating heat through a copper clip structure.
Shutdown performance:
IMWTEK UK1R1N06LFH： Turn off delay of 1.5 μ s, peak drain voltage<80V (Infineon solution 2.2 μ s/120V).
Waveform comparison (Figure 2): The VDS rise slope (dV/dt) of IMWTEK is 30V/ns, while that of competitors is 50V/ns.
Aging test:
IMWTEK UK1R1N06LFH： After 1000 cycles, RDS (on) increased by<3% and avalanche energy remained at 95%.
Life prediction (Figure 3): Based on the Coffin Manson model, the cycle life of IMWTEK exceeds 50000 times at 85 ° C.
4、 Design suggestion: Optimization of LFPAK protection circuit in BMS
Short circuit protection design:
Active clamp circuit: Add TVS (15V) and fast recovery diode (1N4148) to the gate to limit VGS within ± 20V.
Desaturation detection: Use the DESAT function to trigger shutdown within 3 μ s to avoid continuous current rise.
Thermal management optimization:
Double sided heat dissipation: Connect the top and bottom pads of LFPAK to the 2oz copper layer simultaneously, reducing the thermal resistance to 0.5 ° C/W.
Thermocouple monitoring: K-type thermocouples are embedded on the back of the PCB to provide real-time feedback on junction temperature and adjust driving strategies.
EMC and Security Compliance:
RC buffer network: Add a 10 Ω+100nF combination to the drain to suppress dV/dt below 20V/ns, and pass CISPR 25 Class 5.
UL 1741 certification: Integrated hardware watchdog and redundant shutdown path ensure safe isolation of the battery pack even in the event of a single point of failure.
5、 Cost and reliability analysis
BOM cost:
The price of a single UK1R1N06LFH is 15% lower than that of the Infineon BSC060N10NS, and due to its low failure rate, it can reduce the use of fuses and contactors.
Based on a scale of 100000 sets of energy storage systems, the annual maintenance cost is reduced by approximately $450000.
Reliability verification:
Temperature cycle:- Cycle 500 times from 40 ° C to 125 ° C, and the resistance change of the solder joint is less than 0.8%.
Salt spray test: After 96 hours of 5% NaCl spray, the LFPAK pin was free of corrosion (the traditional TO-220 pin was severely oxidized).
6、 Industry Trends and Competitive Strategies
With the development of energy storage systems towards high voltage (1500V) and high energy density, BMS protection MOSFETs need to achieve RDS (on)<0.3m Ω in the same package. IMWTEK UK1R1N06LFH has been introduced into CATL and Tesla Megapack projects through copper clip bonding and wafer thinning technology.
GD ICP No. 2022030985-2