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Battery Technology Team

HK Group has the world's best battery technology experts from the US and China. At the same time, HK Group has set up a technology company developing and manufacturing battery modules and packs in Lianyungang, Jiangsu Province.
  • LTO Battery
  • High Power/High Torque Motor
  • Battery Management System
  • Battery Module & Pack
Core Components

HK LTO Battery

·   Quick Charging: HK LTO Battery can be fully charged in 10 minutes at high C-rate without safety concern;
·   Long Cycle Life: HK LTO battery can sustain over 33000 high DOD cycles and even more low DOD cycles, ten times that of other types of lithium-ion batteries;
·   Excellent Environment Tolerance: Excellent performance from -30℃ to 55℃;
·   Highest Safety: LTO batteries are recognized as the safest lithium-ion batteries due to the stable structure of lithium titanate oxide. Puncture safe.

Battey Specifications
ITEM Specification
Cell Weight 1.73±0.03kg
Cell Size Thickness:12.8±0.33mm
Length:263.0±3.0mm(including Sealant)
Nominal Capacity 60.0Ah@1 C1A(60A)
Capacity Range ≥60Ah@1 /3C1A (20A)
Nominal Voltage 2. 3V
Max Charging Voltage 2.90±0.05V
Min Discharging Voltage 1.5±0.05V
Standard Charging Current 1C1A(60.0A)
Standard Discharging Current 1C1A(60.0A)
Max continuous Charging Current 6C1A(360.0A)
Max continuous Discharging Current 6C1A(360.0A)
Max Peak Charging Current (10s) 10C1A(600A)(10s, 50%SOC)
Max Peak Discharging Current (30s) 10C1A(600A)(30s, 50%SOC)
Transport Voltage 2.165±0.01V
Internal Resistance DC Internal resistance:03~0.7mΩ
AC Internal resistance:0.2~0.6mΩ
(AC Impedance,1000Hz@2.165V)
Cycle Life ≥33000 cycles

High Power, High Torque Motor

·   High-power, high-torque motor provides ample power for the vehicle in a variety of road conditions and operating modes.
·   Motor system employs advanced technology. Motor systems are assembled domestically with imported major components.
·   Motor is connected directly to the drive axle, eliminating gearbox and other speed reduction mechanism that not just cause noise and oil leaks but slao require maintainance, making the ride more smooth and vehicle more reliable.
·   Intelligent temperature management: electronic fan cooling system provides forced air cooling for the motor and control box.
·   Equipped with automatic temperature detection system that initiates lowered power operation and sends alarm in high temperature, and other security functions to prevent negative effects due to thermo concentration.
·   Motor controller uses RS 485/232 and CAN communication for data exchange with strong electric controller and vehicle controller to achieve coordinated control so as to guarantee system realiability.
·   Motor controllers verified by VCA (UK Vehicle Certification Agency).

Battery Specifications
ITEM Specifications
Factory Model DDM110
Rated Power(kW) 110
 Max Power(kw) 200
Rated Torque(N.m) 1000
Peak Torque(N.m) 2600
  Rated Speed(rpm) 1050
Max Speed (rpm) 2400
Operating Ambient Temperature (°C) -40~85
Insulation Grade H
Type of Cooling Liquid Cooling
Level of Protection IP6K5
Dimension(external diameter/length)(mm) 675*571.5*591
Weight(kg) 315

Battery Management System BMS

European developed BMS collects real time working status data of each cell and passes such data and control policy to the vehicle controller in order to achieve optimal management of the cell. Cell voltage can be precisely controlled to ± 2mV.

Multiple protection:

·   Overvoltage Protection
·   Undervoltage Protection
·   Short Circuit Protection
·   Overtemperature Protection
·   Insulation Status Monitoring

Other Protection

Optimal charge algorithm by discharge control (energy prediction) ensures charge balance, increases energy, shortens charging time, and extends battery life. Application interface and diagnostic management functions are also included.

Battery Module & Pack

Battery Module

A battery module is a physical unit of multiple cells connected in series or in parallel. Modules are basic units of HK battery systems.

Battery Pack

A battery pack is made with multiple modules in a container designed for specific vehicles.

Battery Module Design

Each module is equipped with voltage and temperature acquisition device, which monitors the real time status of cells in the module. Module design takes into consideration the heat generated during charging and discharging of cells. Each cell has a cooling fin to disperse the heat.

Battery Pack Design

Depending on capacity requirement, numerous modules are arranged into a total of four battery packs, which are placed atop the roof and beneath the theater seats in the rear without sacrificing cabin space. HK battery pack design also takes into account the following factors:
·   Thermo insulation for cold weather in northern part of China;
·   High performance fan for heat dispersion and cooling;
·   Container/case protection level conforming to IP67 standard;
·   National standard charging port design with one gun charging current up to250A;
·   Equipped with hardware protection circuit to prevent battery short circuit or overcurrent;
·   Each pack has a separate maintenance switch to ensure safety;
·   High standard container/case with 10 year guarantee.

Battery Technology Team

HK Group has set up a battery technology R&D team of world's leading experts from US and China. At the same time, HK Group has set up a battery technology company in Lianyungang, Jiangsu Province, assembling battery modules and packs for electric buses and other EVs.

Battery Pack Specifications
Nominal Voltage/Voltage Range 588.8/499~742 V 2p256s
Nominal Capacity/Voltage Range 120/(499~742V) Ah
Total Energy 70.6 kWh  
Continuous Discharging Current 180 A  
Max Peak Discharging Current (30s) 450 A  
Continuous Charging Current 250/500 A One Gun
Max Peak Charging Current(10s) 500 A  
Insulation Resistance ≥2  Insulation resistance of pack
Cycle Life ≥33000 cycles  
Dimensions(L*W*H) Roof Pack mm 1910*870*345
Saddle Pack mm 1015*718*537
Level of Protection IP67(excl. air intake)    
Protection Mechanism Dual protection mechanism with internal fuse and BMS protection signal   BMS sends signal to vehicle controller to trigger protection action. BMS disconnects contactor to protect equipment in serious case
Thermal Management Forced air cooling    
Communication Mode CAN    
DC Insulation Resistance of Pack ≤180  
Total Weight ≤1400 Kg