O'CELL 110Ah 12V Product Specification Rev. 0.1 -

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SHENZHEN OCELL TECHNOLOGY CO., LTD. BuildingA3,Chengtou industrial Park,Qinghu Village,LonghuaTown,Bao’anDistrict,Shenzhen 518109,P.R.China Tel: +86-755-81781377 Fax: +86-755-81781420 Email:[email protected] Web: www.ocelltech.hk Address:

O’CELL 110Ah 12V Product Specification Rev. 0.1

SHENZHEN OCELL TECHNOLOGY CO., LTD. BuildingA3,Chengtou industrial Park,Qinghu Village,LonghuaTown,Bao’anDistrict,Shenzhen 518109,P.R.China Tel: +86-755-81781377 Fax: +86-755-81781420 Email:[email protected] Web: www.ocelltech.hk Address:

REVISION TABLE Revision 0.1

Changes Initial Revision

Reason Starting Point

Date

Author

SHENZHEN OCELL TECHNOLOGY CO., LTD. BuildingA3,Chengtou industrial Park,Qinghu Village,LonghuaTown,Bao’anDistrict,Shenzhen 518109,P.R.China Tel: +86-755-81781377 Fax: +86-755-81781420 Email:[email protected] Web: www.ocelltech.hk Address:

INTRODUCTION This product is designed for hybrid or electrical vehicle and other application using Li-Ion Battery Technology of O’Cell. The design will utilize O’Cell’s 18650 cells in a 4S79P cell configuration to build a single battery module. The nominal voltage is 12.8V and the capacity is 110AHr or 1408WHr. This battery module can be connected together in series and parallel configurations to meet the voltage and power needs of the application. An external contactor or some other means of protection needs to be connected in series with this battery module to protect against over-charging and over-discharging the modules. The primary protection is controlled by a Battery Management Unit (BMU) to connect/disconnect the battery modules with the power train. And the BMU will communicate with these modules through RS-485 bus and ensure they work properly in the whole hybrid or electric vehicle power train.

FEATURES Feature

Comments

One Battery module

110AHr or 1408WHr (316 O’Cell18650 cells in a 4s79p configuration.)

Size

260 mm x 172 mm x 225 mm

Weight

15.8kg

Nominal module voltage

12.8V

Maximum module voltage

14.6V

Minimum module voltage

8.0V

Nominal load current

150A max. continuous current @ 23° C

Peak load current

300A max for 30 sec @ 23° C

SHENZHEN OCELL TECHNOLOGY CO., LTD. BuildingA3,Chengtou industrial Park,Qinghu Village,LonghuaTown,Bao’anDistrict,Shenzhen 518109,P.R.China Tel: +86-755-81781377 Fax: +86-755-81781420 Email:[email protected] Web: www.ocelltech.hk Address:

Charge Disconnect

Cell Balancing

When the Battery modules are charged to full, they will communicate with BMU, and the BMU has the capability to turn off the charger or open the main contactor. The battery module itself does not have any switch to disconnect the charger. The intra-module balancing circuitry is used to compensate slight capacity imbalance among the eight cell banks within a battery module. The inter-module balancing circuitry is used to compensate slight capacity imbalance between different battery modules in series connection.

State of Charge Measurement

Individual cell voltage and charge/discharge current will be used to monitor the state of charge (SOC) of the battery module. The estimated capacity used for the calculations will be adjusted to meet the capacity of the lowest capacity cell bank when the pack is fully cycled. The state of charge will be adjusted for normal self discharge of the pack when the unit is not on charge.

RS-485 Communication Uplink

RS-485 Communications will be used to communicate with the Battery Management Unit (BMU) or connection to other battery Modules.

RS-485 Communication Downlink

RS-485 Communication connection from Downstream battery module.

RS-485 insulation voltage rating

1414V 5000V rms for 1 minute

Status LED

A Dual LED on module to indicate working status. One is green and the other one is red. Blinking of the green LED indicates that the module is working properly. Blinking of the red LED indicates that the module has failure and needs service.

ELECTRICAL INTERCONNECT The battery module has a positive terminal and a negative terminal. The positive terminal is connected directly to the positive electrode of the top cell bank, while the negative terminal is connected to the negative electrode of the bottom cell bank. RS-485 bus will be used as the communication method between battery modules and BMU.

SHENZHEN OCELL TECHNOLOGY CO., LTD. BuildingA3,Chengtou industrial Park,Qinghu Village,LonghuaTown,Bao’anDistrict,Shenzhen 518109,P.R.China Tel: +86-755-81781377 Fax: +86-755-81781420 Email:[email protected] Web: www.ocelltech.hk Address:

CHARGE CONTROL An inter-module balancing circuit is present and can be activated when a slight imbalance between individual modules is detected by the external BMU. The charger should also have a voltage limit, which will be activated when the battery modules are charged to close to full and the charge current is very small.

CHARGING INTERRUPT The external BMU is to open the main contactor when the following event occurred: 1. When a battery module is charged to full; 2. When a cell voltage in the series string exceeds XV; 3. When cell surface temperature of any module exceeds 60ºC.

DISCHARGE INTERRUPT When a cell voltage in the series string fall below XV then the BMU open the main contactor.

CURRENT MEASUREMENT Current range from -55A (charging) to +150A (discharging) within the accuracy of +/-1A.

VOLTAGE MEASUREMENT Voltage measurements should be accurate within 20mV per cell throughout the full operating temperature range.

TEMPERATURE MEASUREMENT Cell temperatures will be measured at 4 positions on the cell surface using thermistors, another thermistor on the PCBA to monitor the temperature of the PCB.

STATE-OF-CHARGE MONITORING State-of-charge (SOC) will be monitored via individual cell voltage measurements and the charge/discharge current. The SOC accuracy shall meet the accuracy listed below: Accuracy of SOC to be 0 – 20% SOC: 5% accuracy (voltage-temperature compensated) 20% - 80% SOC: 10% accuracy (coulomb counting) 80% - 100% SOC: 5% accuracy

SHENZHEN OCELL TECHNOLOGY CO., LTD. BuildingA3,Chengtou industrial Park,Qinghu Village,LonghuaTown,Bao’anDistrict,Shenzhen 518109,P.R.China Tel: +86-755-81781377 Fax: +86-755-81781420 Email:[email protected] Web: www.ocelltech.hk Address:

CELL BALANCE ADJUSTMENT The inter-module balancing is to compensate the capacity imbalance between multiple battery modules in a given system. The intra-module balancing is to compensate the capacity imbalance among cell banks within a battery module. In this case the balancing load shunts current across the cell bank.

BATTERY FAULT INDICATION A dual LED is used to indicate the working status on the top side of the plastic enclosure. When the battery module works properly and connected to a BMU, a green LED is illuminated. In case the battery module has a critical error and can no longer work properly, a red LED is illuminated.

CIRCUIT SELF DISCHARGE RATES The circuit within the battery module will have a self discharge rate : Condition Leakage current shipping mode (Not connected with other Less than 1.0mA battery modules and BMU) Working mode (Connected with other Less than 6.0mA battery modules and BMU), charging or driving Sleep mode (Cell voltages are below Less than 700 µA discharge cut-off voltage, or the vehicle is not ignited.)

Leakage current of PCBA within the battery module

BATTERY PACK USEFUL LIFE The battery module shall deliver a minimum of 600 continuous run 100% DOD cycles to 60% of original performance when run at 23˚C.

BATTERY PACK SHELF LIFE The battery pack shall have one year shelf life when it is shipped with XX% SOC.

OVERALL APPEARANCE The total dimension is 260mm*172mm*225mm.

SHENZHEN OCELL TECHNOLOGY CO., LTD. BuildingA3,Chengtou industrial Park,Qinghu Village,LonghuaTown,Bao’anDistrict,Shenzhen 518109,P.R.China Tel: +86-755-81781377 Fax: +86-755-81781420 Email:[email protected] Web: www.ocelltech.hk Address: