Lithium-Ion (Li-Ion) Batteries for OEM Applications

Lithium-ion (Li-Ion) batteries are widely used across industrial equipment, medical devices, and portable electronics due to their high energy density, long cycle life, and efficiency. However, battery performance is not standardized. Results depend on cell format, battery architecture, and system-level design, all of which must be aligned with the application.

What is a Lithium-Ion Battery

A lithium-ion battery is a rechargeable energy storage system that delivers high-capacity, long-lasting power. It operates by transferring lithium ions between a cathode (positive electrode) and anode (negative electrode) through an electrolyte. During discharge, ions move from the anode to the cathode, reversing during charging.

Compared to traditional battery types, Li-Ion systems offer higher energy density, faster charging, and lower maintenance requirements. These characteristics make them a common choice for both portable and industrial applications.

Advantages of Lithium-Ion Batteries

Li-Ion batteries are selected for applications where performance and space efficiency are the top priority. Key advantages include:

  • High energy density for compact and lightweight system design
  • High energy efficiency, reducing energy loss and overall consumption
  • Long cycle and calendar life with low maintenance requirements
  • Cost savings through reduced operational and energy expenses
  • Reliable and consistent power delivery with low self-discharge
  • Support for sustainable and lower-emission energy systems
  • Strong performance across a wide range ofoperating conditions, including cold environments
  • Compatibility with data-driven monitoring and advanced battery management systems

Lithium-Ion Battery Safety, Risks & Battery Management Systems

Lithium-ion batteries require proper system design to operate safely. Their high energy density introduces risks that must be actively managed at the battery system level. One of the primary concerns is thermal runaway, a self-accelerating reaction where heat generation increases uncontrollably and can result in fire or explosion.

Thermal runaway can be triggered by:

  • Overcharging or deep discharge
  • Internal short circuits or cell defects
  • Mechanical damage or vibration
  • Elevated operating temperatures
  • Formulation of internal dendrites due to calendar age of battery

Because lithium-ion batteries contain flammable materials,these conditions must be controlled through monitoring and system-level protection. Battery management systems (BMS) are the primary method for controlling these risks and are critical for maintaining safe and stable battery performance in real-world applications.

Lithium-Ion Cell Formats: Cylindrical vs. Prismatic vs. Pouch

Lithium-ion batteries are manufactured in multiple cell formats. Some of the most common formats include cylindrical, prismatic, and pouch (lithium polymer). Each format affects performance, packaging, and system design.

Cylindrical Lithium-Ion Battery Cells

Cylindrical cells use a rolled electrode structure inside arigid metal casing.

Key characteristics:

  • Strong mechanical durability
  • Consistent manufacturing quality
  • Lowest cost cell construction for assembly into a variety of battery configurations
  • Widely used in industrial and high-volume applications
  • Standardized cell sizes across multiple manufacturers offer broad selection based on application, cost, quality, and performance

Considerations:

  • Lower packing efficiency due to spacing between cells

Prismatic Lithium-Ion Battery Cells

Prismatic cells use a flat, rectangular enclosure.

Key characteristics:

  • Improved space utilization
  • Higher capacity per cell
  • Simplified module design

Considerations:

  • Requires structural and thermal support
  • Performance depends on system design
  • Generally higher cost than cylindrical cells due to manufacturing costs
  • Fewer size and capacity options across manufacturers
  • Limited capacity upgrade paths

Pouch (Lithium Polymer) Battery Cells

Pouch cells use a flexible laminated enclosure.

Key characteristics:

  • Lightweight construction
  • High energy density
  • Flexible form factors for compact designs
  • Lower tooling costs compared to cylindrical or prismatic cells
  • Unlimited size and capacity options from a manufacturing standpoint
  • Cell dimensions can be tailored to exact application requirements, eliminating wasted internal space

Considerations:

  • Requires internal support
  • Can expand or swell if not properly managed

Why Lithium-Ion Battery Cell Format Matters

Cell format directly impacts thermal performance, mechanical durability, energy density and runtime, and battery pack complexity. The correct cell format choice depends on application requirements and operating conditions. Other battery chemistries to compare include lithium phosphate, sodium-ion, and nickel-metal hydride (NiMH). If you’re unsure what cell format is best for your application, reach out to our team, and we can guide you in the right direction.

Design Considerations for Lithium-Ion Batteries

When evaluating lithium-ion battery systems, OEM teams typically consider:

  • Space and form factor constraints
  • Power vs. energy requirements
  • Operating temperature range
  • Mechanical and environmental exposure
  • Safety, monitoring, and certification requirements, including UL, intrinsic safety, and other standards that may dictate cell form factor

These factors influence both cell selection and overall battery system architecture.

Applications

Lithium-ion batteries are used across a wide range of OEM applications:

Different applications require different battery architectures, which is why system-level design is critical.

AMP Supports Custom Lithium-Ion Battery Design

Apex Mobile Power (AMP) specializes in designing custom lithium-ion battery packs tailored to specific application requirements, including systems with fully integrated battery management systems (BMS) and solutions built for extreme operating conditions.

Contact us to get started or give us a call at 1 (855) 267-3674.