High voltage battery cell

Article: EV0196 (CATL)

Advantages of the CATL 117Ah lithium-ion cell

High energy density. Significant amount of energy in a compact size (0.4329 kWh per cell). Ideal for use in electric transport, energy storage systems and portable devices.

Durability. Over 2,000 charge-discharge cycles while maintaining 80% of nominal capacity. Long service life makes the cell cost-effective.

Wide operating temperature range

• Charging: 0°C to +55°C.
• Discharge: from -20°C to +55°C.
• Suitable for use in various climatic conditions.

High stability. Low internal resistance (<0.7 mOhm) ensures stable operation and minimal energy loss. Increased resistance to deep discharge and high currents.

Flexible application. Suitable for series and parallel connection to achieve the required voltage and capacity. Used in electric vehicles, solar systems, electric bicycles and tools.

Fast charging and discharging. Supports charging currents up to 1C (117 A) and discharge currents up to 3C (351 A). Can handle high loads without overheating.

Environmentally friendly. Complies with EU directives (2006/66/EC) and recycling requirements. Recyclable structure with minimal environmental impact.

Reliability and safety. Compatible with modern BMS (Battery Management Systems) that prevent overcharging, over-discharging and overheating. Resistant to vibrations and mechanical stress thanks to its robust construction.

Lightweight and compact. The cell weighs only 1.66 kg, which facilitates system design and installation. Operating features

Charging:

• Requires a special charger with a Li-ion profile
• Charging mode: CC/CV (constant current/constant voltage).
• Nominal voltage: 3.7 V.
• Maximum charging voltage: 4.2 V.
• Exceeding 4.25 V may result in degradation and damage to the cell.
• Recommended current: 0.5C (58.5 A).
• Maximum current: 1C (117 A).

Balancing:

• It is important to use a BMS (battery management system) to prevent over-discharge and over-charge.
• Lithium-ion cells require balancing to prevent voltage imbalances in the assembly. This extends battery life and improves safety.
• Balancing is usually performed at the end of the charging phase (voltage 4.2 V).
• Use a BMS (Battery Management System) with active or passive balancing.

Depth of discharge (DoD):

• For maximum service life, it is recommended to use cells within the range of 10% to 90% of their capacity.
• The cell can be discharged to 2.75 V.
• Overdischarge below 2.5 V may cause irreversible damage to the cell.
• Nominal discharge current: 1C (117 A).
• Maximum short-term current: 3C (351 A).
• Avoid prolonged high loads.
• Discharge can be carried out at temperatures between -20°C and +55°C.

Warranty

Initial warranty period:

1.1 One-year warranty on all new batteries sold by our company.

2. Warranty cases:

2.1 The warranty only applies to batteries purchased from our store.

2.2 Power supplies can be returned or exchanged within 30 days of the date of sale, provided that the original packaging is undamaged and there are no signs of assembly.

2.3 The supplier shall not reimburse the costs of dismantling and installation, transport services or consumables in connection with a defect in the power supply.

2.4 The warranty is valid only if the installation instructions are followed.

3. Start of the warranty period:

3.1 The warranty begins on the date of sale to the buyer.

4. Buyer's obligations:

4.1 In the event of a change in the capacity of the Power Supply, the buyer must stop using it and contact the supplier.

4.2 The buyer is obliged to ensure that the Power Supply Unit(s) is installed in accordance with our Commissioning and Installation Instructions.

5 Supplier's obligations in the event of complaints:

5.1 Complaints will be investigated within 10 days of receipt of the Power Supply Unit and documents.

5.2 If the complaint is accepted, the Power Supply Unit will be replaced with a new one at no additional cost.

5.3 If the complaint is rejected, the supplier shall inform the customer about the disposal of the defective Power Supply Unit in accordance with Directive 2006/66/EC and Regulation (EU) 2019/1020.

5.4 If the warranty is accepted, the Power Supply Unit will be replaced or refunded.

6. Documents required for filing a complaint:

6.1 Receipt or invoice

6.2 Complaint report with measured data of the Power Supply Unit and a description of the defect.

7. Exclusions from the warranty:

7.1 Lack of necessary documents.

7.2 Incorrect operation of the power supply unit.

7.3 Violation of the technical process during commissioning, assembly or disassembly of the power supply unit.

7.4 Mechanical damage detected.

7.5 Unauthorised interference with the operation of the power supply units, including opening.

Installation instructions for CATL 117Ah cells

CATL 117Ah cells are high-tech lithium-ion batteries that require strict adherence to all installation and operating procedures. Failure to follow these instructions may result in damage to the cells and loss of warranty.

Step 1. Unpacking

Inspect the packaging for damage during transport.

Carefully open the box, avoiding the use of sharp objects that could damage the cells.

Make sure that each cell is intact and has no visible damage to the casing.

Check the contents: battery cells, technical documentation, additional accessories (if applicable).

Important: Do not expose the cells to moisture or dust during unpacking.

Step 2. Measuring capacity and voltage

Use a professional multimeter to check the voltage of each cell. Normal voltage in storage: 3.6-3.8 V. Deviations greater than ±0.2 V require further diagnosis. Perform a capacity test using a special charge-discharge device. Set the standard charge parameters (4.2 V, 0.5C). Discharge the cell to 2.75 V and record the capacity. The capacity must match the declared capacity (117 Ah ±5%).

Important: Never exceed the permissible voltage limits (2.75-4.2 V) to avoid damaging the cells.

Step 3. Selecting cells

By capacity: Select cells with the same capacity (±0.5Ah) to minimise imbalance in the assembly.

By voltage: The voltage of all selected cells must be within ±0.05 V of each other.

Divide the cells into groups according to the design requirements (series or parallel connection).

Step 4. Assembly into groups

Connection order: Series connection (voltage increase): connect the positive terminal of one cell to the negative terminal of another. Parallel connection (capacitance increase): connect the positive and negative terminals to each other. Use connecting plates or copper busbars to ensure reliable contact. Ensure that all contacts are properly insulated. Critical: Avoid short circuits. A short circuit can destroy the cell.

Step 5. Connecting the BMS board

Select a BMS that matches the nominal voltage and capacity of your assembly. Connect the balancing wires to each cell according to the connection diagram in the BMS documentation. Check the connection with a multimeter before activating the board.

Install the BMS in a location protected from moisture and mechanical damage. Important: Incorrect connection of the BMS may result in overcharging or over-discharging of the cells, which will significantly reduce their service life.

Step 6. Operation

Operating voltage range: 2.75-4.2 V for each cell.

Current range:

• Charge: up to 1C (117 A).
• Discharge: up to 3C (351 A).

Charging recommendations: Use a charger with voltage and current limiting function. Do not allow deep discharge below 2.75 V.

Discharge recommendations:

Avoid continuous peak loads.

Ensure that the cooling system is effective at high currents.

Critical actions to avoid:

• Overcharging above 4.25 V will cause cell degradation or ignition.
• Discharging below 2.5 V may irreversibly damage the cell.
• Overheating above 55°C will shorten the service life.
• Mechanical damage to the cell casing.
• Incorrect connection of the terminals or BMS board.

Step 7. Checking and commissioning

Check all connections, including the BMS wires, before the first start-up. Charge the battery to 50-70% for initial testing. Check the voltage balance between the cells. Make sure there is no overheating or abnormalities during charging/discharging.

Conclusion

Following these instructions will prevent damage and ensure long and stable operation of CATL 117Ah cells. If you have any questions, please contact your supplier or a specialist.