EV Laser Marking Applications

Electric vehicles (EVs) are becoming more popular as the demand increases for cleaner, safer, and environmentally friendly alternatives to gas vehicles. Because of the newness of EVs, traceability and manufacturing efficiency is essential. As such, laser-marking electric vehicles is a critical task in the booming EV industry.

EVs are known for their lightweight parts that increase energy efficiency. Manufacturers are using materials such as aluminium, resin, and glass epoxy instead of heavy materials like steel. However, lightweight materials can be delicate and prone to heat damage.

EVs have several internal components that need to be marked, including batteries, DC-DC converters, inverters, and ECU connectors. UV laser electric vehicle marking provides permanent, damage-free, and high-contrast marking for traceability and assembly. In this article, we discuss each of the parts and how a UV laser marking machine can be an essential tool for marking.

EV Internal Parts: Batteries, DC-DC Converters, ECU, and Inverters


Batteries are the backbone of electric and hybrid vehicles. They are the power source instead of a gas engine.

EV batteries gain power through charging stations or vehicle deceleration. The most common type of battery used for EVs is made from lithium-ion due to its high energy capacity, compact size, and lightweight design.

Laser marking parts of lithium-ion batteries is essential for identification, use, assembly, and traceability purposes. Lithium-ion batteries should have 2D codes, serial numbers, and rough surface adhesion to improve bonding strength.

Serial numbers can provide information about the vehicle the battery is used in, the date it was manufactured, and the manufacturer’s identity. All of this information can be useful for recalls or supply chain management. 2D codes are particularly useful as they can be scanned to easily access this information. Additionally, 2D codes are beneficial for assembly purposes. They can signify how to put a battery together by markings or be scanned for assembly instructions. Because of how lightweight lithium-ion batteries are, they are easily damaged if marked too harshly.

DC-DC Converters

A DC-DC converter is a device made from glass epoxy PCB that converts high-voltage DC from an EV’s battery supply into low-voltage DC electricity. DC-DC converters power EV instruments such as headlights, windshield wipers, and audio systems.

To identify and track DC-DC converters for supply chain management and assembly, serial number marking and 2D codes are necessary. Similar to batteries, the 2D code can give insight into a DC-DC converter's manufacturing history. Additionally, serial numbers created by character marking can also be helpful in aligning a DC-DC with the correct EV.


An inverter is a device made of glass epoxy PCB that converts DC electricity stored in a battery into AC electricity. This AC electricity is used to power a synchronous motor, which controls the flow of electricity. The flow of electricity powers the car and allows it to move.

Inverters need 2D code marking on two parts: the aluminium cast and the cooling equipment. Both of these parts need 2D marking for identification purposes because of the variety of specifications. Cooling equipment can vary with the same type of inverter, so 2D marking ensures the correct form. Additionally, an aluminium cast must be identified by millimetres depending on product tolerance.


As EVs evolve, it is likely that ECU capabilities will also evolve and grow.

ECUs need to be marked with both a serial number on the case cover and a 2D code for connector identification and traceability purposes. ECU connectors are often made from cream-coloured and grey resin. Because the resin is heat-sensitive and fragile, harmless marking is essential.

ECU connectors control many aspects of an EV, such as:

  • Engines
  • Airbags
  • Power steering
  • Transmission
  • Stop/Start
  • Charging