
OEM Automotive Fuse Links for EV / Plugin / HEV / FCEV
Application | Description | IrregularCycles | SC Currents | AmbientTemp. | Kc |
HV BatteryDistributionUnit (BDU) | Collects and manages HV powerfrom the battery pack to theinverter, controls and distributesenergy to accessories and auxiliary power unit | Moderatecurrentfluctuations | High shortcircuitcurrents, ca. 7-10 x In | Moderateto high | 0.8 |
DC/DC Converter | Converts HV DC power from traction battery pack to LV DC power for accessories and aux.battery | Low current variations | Low shortcircuitcurrents, 3-5 x In | High | 1.0 |
OnboardCharger(OBC) | Converts the AC electricity fromthe charging interface to DC power used for charging thebattery pack, monitors voltage, current and SoC | Low current spikes andvariations | Low tomedium short circuitcurrents, 3-5 x In | High | 1.0 |
PowerDistributionUnit (PDU), Control Signal | Protects, balances the HV power, managing voltage,current, SoC (State ofCharge), temperature | Moderateto highcurrent fluctuations | Medium tohigh short circuitcurrents, 5-10 x In | Moderate | 0.8 |
Manual SwitchDisconnects(MSD) | The MSD presents a manuallyoperated disconnect for internal high voltage battery packs, while protecting the battery from shortcircuit. | Low current variations | Medium tohigh, 4-10 xIn | Very high | 0.8 |
Accessories | Air conditioning, heater controling, oil or air pumps etc. | Highcurrentvariations | Medium tohigh, 4-10 xIn | Moderate | 1.0 |
Pure EV and Plug-in Systems:They are fully battery powered,usually by a 32kWh to 64kWhtraction battery and auxiliarypower unit. The fuse for these electrical circuits hast towithstand high currentfluctuations, constant chargingand discharging, high operational temperatures, current overloadscenarios and high short circuitcurrents with interrupting rating up to 20kA.
HEV Systems: In a hybrid systemthe battery pack is usually smaller,ca. 10kWh to 20kWh and operatesat lower voltages 200-450 Vdc.Harsh acceleration and chargingis generally managed through theICE and regenerative braking withmoderate load and effect on thefuse life cycle. Nevertheless, current overload situations andhigh short circuit currents withinterrupting rating up to 20kA arecritical for selecting the correctfuse.
HFC-EV Systems: Acombination of hydrogen fuel cell and battery pack produce theelectric power, whereas theamount of energy stored on board is determined by the size of the hydrogen tank. Therequirements on nominal currentratings as well as interruptingratings up to 50kA are usuallyhigher than in EV and Plug-insystems.
The formula for current rating of an EV fuse is based on Ib: Ib = In x KT x Ke x Kv x Kn x Kc
Converted to : In ≥ Ib / (KT x Ke x Kv x Kn x Kc)
In: rated nominal current of fuse
Ib: the allowable maximum continuous load current in the circuit, determined by operation current of the application
KT: temperature derating factor, determined through measurement of theambient temperature
Ke: heat transfer derating factor, determined through the cross section of the terminal connection
Kv: cooling correction factor, when additional cooling measures areemployed
Kc: cyclic loading factor, basically the ’premature aging’/ fatigue factor of the fuse due to to heavy mechanical stress from current over-loadfluctuations
Guangdong Uchi Electronics Co.,Ltd
Uchi was established in 2006 in Dongguan, China.
After years of development, Uchi has become a large scale hi-tech
enterprise that specialized in development and production of
complete series of MOV,PTC, NTC series, PPTC series, Fuse(ALL
TYPE),Resistor、integrated circuit 、 Capacitor, surge protector and
protective devices of lightning protection products. It ranks front
in the industry and has heartquarter in Hong Kong. With its
excellent technology and quality products, Uchi has won wide
recognition of overseas customers. Saini Impex PVT.LTD is our
authorized sole distributor in india .
China's leading enterprise of circuit protection components
Our strength :
A large number of product series in our factory have passed the
certification of various international standards
Factory Tour :
Advanced equipment, lean production
Uchi boasts with a production base that covers an area of nearly
15000 square meters.
We successively imported high-tech fully automated production
equipments and high precision testing instruments and have put into
production to realize the automation, large scale and
standardization.
Uchi has a galaxy of hi-tech talent teams headed up by national
class experts to engage in the work of product development, product
quality control, sales andservice technical support, etc., and has
successively obtained tens of certificates of appearance patents,
utility patents and inventions.
To guarantee the quality, we successfully passed the certification
of ISO9001:2008 quality management system, scientific and efficient
managing mode to carry out lean production and form scientific and
efficient quality control system. The products are certified with
UL, CUL, TUV, VDE, CSA and SGS, RACH 73 environmentally friendly
testing certifications.
Exquisite quality at customers' favor
Uchi is an export membership of Alibaba with free import and export rights. It is appraised as Guangdong Famous Star Enterprise and Dongguan Private Enterprise. Our products have doubled and redoubled to provide more kinds and high quality and reliable products and service. Our products mainly consist of:
Metal Oxide Varistor
DIP Varistor & SMD Varistor
Thermally Protected Varistor
DC-Link Capacitor for New energy vehicles supporting the HEVEV
Automotive Fuse Links for EV Plugin HEV FCEV
PTC Thermistor
NTC Thermistor
PPTC Resettable Fuse
Thermal Fuse
Auto Blade Fuse
Glass Fuses
Metal Film Resistor
Carbon Film Resistor
Cement Resistor
NTC Temperature Sensor
CDS Photoconductive Cell
Our products are widely used in New energy vehicles, home appliance, medical equipment, office equipment, communication
equipment, phone battery, electronic calendar, electronic
thermometer and temperature controller to cover military
telecommunications, IT, automobile and consumer electronic fields.
Cooperation with good faiths to win in the market.
Excellent quality sincere service is the key to the success of
Uchi.
In the future Uchi will still stick to the tenets of "Quality
first, customer foremost." "First class quality, first class
service and customersatisfaction" to manufacture the high quality,
technically advanced and reasonable prices products. We hope to
trigger with global partners the revolution in resistor products.
We cordially welcome friends from home and abroad to visit us for
guidance and cooperation.