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Components Inside the Battery

What are the components inside an EV battery?
Top view of 4 yellow Lithium-ion
© Unsplash

EV batteries are complex and consist of several key components, including cells, separators, housing and battery management systems. It is important to understand these components and their role in the operation of the EV battery.

In particular, this article will:

  • show the structure of a battery
  • explain the main components of a battery.

The structure of the battery system depends on the application and includes the design and arrangement of the batteries for optimum performance. The structure of the battery system and its components for automotive applications and vehicle integration are then explained.

Diagram that explains how a set of various battery cells form a battery module, and simultaneously a set of various battery modules form a battery pack.Click to expand

Relation between the battery cell, module and pack. Enderman (n.d.), EV West (n.d.), Tesla (n.d.)

Battery cell:

EV storage systems are largely based on lithium-ion cells.

Battery module:

The selected battery cells are assembled and interconnected in the battery modules.

Battery pack:

Finally, several battery modules are joined together with the peripheral system components in the assembly of the battery pack.

All types of battery cell formats are used in EVs, regardless of the vehicle class. Each format has its own unique product architecture and manufacturing process, as shown in the diagram below.

Examples of how a battery pack is assembled in different vehicles, including the BMW i8 PHEV, Tesla Model 3 and a Chevrolet BoltClick to expand

Examples of battery packs in different EV models. BMW (n.d.), Tesla (n.d.), Chevrolet (n.d.)

If you’d like to familiarize yourself with the main components of a battery module and the key elements of a battery pack, you can refer to the accompanying material in this article.


In summary, the battery is one of the most critical components of an EV. It consists of several parts that work together to store and deliver the energy required by the electric motor.

Selecting and optimizing each of these components is critical to improving battery capacity, durability and efficiency.

As battery technology continues to advance, it is expected to reduce the cost and improve the performance of EVs.

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Exploring the World of Electric Mobility: Key Concepts and Strategies

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