Battery Welding Methods: From Craftsmanship to High Technology

24.03.2026

From the first primitive connections to high-precision automated processes, the history of battery welding is a story of the evolution of engineering thought.

Author:
BTRY.ENERGY

Battery Welding Methods: From Craftsmanship to High Technology

In the early stages of battery development, namely from the late 19th to the early 20th century, the main connection methods were mechanical contacts or tin soldering.

Soldering made it possible to create more reliable electrical connections, but it had significant drawbacks, such as low mechanical strength, difficulty in scaling, and a high risk of damaging the cells due to elevated temperatures.

With the development of portable electronics, it became clear that a different approach was needed.

Transition to Resistance Welding

A real breakthrough came with the introduction of contact, or spot welding. This method is based on passing a high current through the contact point for a very short time, which causes localized heating and bonding of the metals.

The advantages of this method include:

minimal thermal impact on the battery
high process speed
possibility of automation

Spot welding has become the standard for assembling battery packs, especially with the advent of Li-Ion cells. Over time, more advanced methods have emerged:

laser welding
ultrasonic welding
pulse welding

These methods make it possible to efficiently weld metals such as copper and silver, which positively affects the quality of large battery assemblies, for example in electric vehicles.

Nevertheless, the main welding methods today remain spot welding and laser welding.

Main Types of Welding by Materials

After reviewing the evolution of welding technologies, let us move on to the materials that form the basis of these processes. The choice of metal determines not only the connection technique, but also the efficiency of current transfer, heat losses, and the durability of the battery pack.

Each material has its own physical properties that dictate different welding conditions and areas of application, so let us consider them separately and in more detail.

Nickel Welding

Nickel is one of the most common materials used in battery welding. Nickel strips are easy to spot weld and bond well with steel battery cases. This is the standard choice for most battery assemblies.

Reasons for popularity:

good electrical conductivity
corrosion resistance
relatively low hardness

Nickel-Copper Welding

Composite strips (nickel + copper) are used to achieve a balance between conductivity and manufacturability. Copper provides low resistance, while nickel acts as a contact layer for welding.

Advantages:

better efficiency in high-current systems
compatibility with standard equipment
an excellent solution for electric transport, UAVs, UGVs, and high-power battery assemblies

Our website offers battery assemblies with both types of welding, for example for FPV drones. You can explore our products via the link.

Copper Welding

Copper has one of the best electrical conductivities among metals, but it creates certain challenges during the welding process, such as difficulty in achieving a stable weld.

That is why more advanced methods such as laser or ultrasonic welding are typically used when working with copper.

Silver Welding

Silver has the best electrical conductivity of all metals, but due to its high cost, it is used only in limited applications, such as specialized high-precision systems or in military and aerospace technologies.

Advantages:

minimal electrical resistance
excellent contact stability

Disadvantages:

high cost
processing complexity

We Keep Moving Forward

Today, the choice of welding method is determined not only by materials, but also by requirements for power, durability, and safety. And although technologies continue to evolve, the main goal remains unchanged: to create the most efficient and reliable path for energy flow.

Our company BTRY.ENERGY is also continuously evolving. We manufacture battery assemblies in any volume — from single custom orders to large-scale production in the thousands.

We also develop custom energy solutions tailored to your needs through our in-house R&D department.

You can find more details about submitting such a request via the link.