Passive Components Blog
No Result
View All Result
  • Home
  • NewsFilter
    • All
    • Aerospace & Defence
    • Antenna
    • Applications
    • Automotive
    • Capacitors
    • Circuit Protection Devices
    • electro-mechanical news
    • Filters
    • Fuses
    • Inductors
    • Industrial
    • Integrated Passives
    • inter-connect news
    • Market & Supply Chain
    • Market Insights
    • Medical
    • Modelling and Simulation
    • New Materials & Supply
    • New Technologies
    • Non-linear Passives
    • Oscillators
    • Passive Sensors News
    • Resistors
    • RF & Microwave
    • Telecommunication
    • Weekly Digest

    TDK Introduces High Current 80VDC Board-Mount EMI Filters

    Bourns Releases High Heat Tolerant TO-227 Thick Film Resistor

    TDK Increases Current Ratings of Automotive Thin-Film Power Inductors

    Sumida Announces New DC Common Mode Choke Coil Series

    KYOCERA AVX Releases New 3dB Hybrid Couplers

    SCHURTER Unveils High Voltage Fuses for EV Applications

    YAGEO Releases First to Market 750V Aluminum Capacitors

    binder Introduces M9 Compact Circular Connector

    Smolteks CNF-MIM Capacitors Meet Thermal and Voltage Stability Industry Requirements

    Trending Tags

    • Ripple Current
    • RF
    • Leakage Current
    • Tantalum vs Ceramic
    • Snubber
    • Low ESR
    • Feedthrough
    • Derating
    • Dielectric Constant
    • New Products
    • Market Reports
  • VideoFilter
    • All
    • Antenna videos
    • Capacitor videos
    • Circuit Protection Video
    • Filter videos
    • Fuse videos
    • Inductor videos
    • Inter-Connect Video
    • Non-linear passives videos
    • Oscillator videos
    • Passive sensors videos
    • Resistor videos

    Accelerating Full Bridge LLC Resonant Converter Design with Frenetic AI

    Understanding Switched Capacitor Converters

    Coupled Inductors Circuit Model and Examples of its Applications

    Inductor Resonances and its Impact to EMI

    Highly Reliable Flex Rigid PCBs, Würth Elektronik Webinar

    Causes of Oscillations in Flyback Converters

    How to design a 60W Flyback Transformer

    Modeling and Simulation of Leakage Inductance

    Power Inductor Considerations for AI High Power Computing – Vishay Video

    Trending Tags

    • Capacitors explained
    • Inductors explained
    • Resistors explained
    • Filters explained
    • Application Video Guidelines
    • EMC
    • New Products
    • Ripple Current
    • Simulation
    • Tantalum vs Ceramic
  • Knowledge Blog
  • Suppliers
    • Who is Who
  • Events
  • Home
  • NewsFilter
    • All
    • Aerospace & Defence
    • Antenna
    • Applications
    • Automotive
    • Capacitors
    • Circuit Protection Devices
    • electro-mechanical news
    • Filters
    • Fuses
    • Inductors
    • Industrial
    • Integrated Passives
    • inter-connect news
    • Market & Supply Chain
    • Market Insights
    • Medical
    • Modelling and Simulation
    • New Materials & Supply
    • New Technologies
    • Non-linear Passives
    • Oscillators
    • Passive Sensors News
    • Resistors
    • RF & Microwave
    • Telecommunication
    • Weekly Digest

    TDK Introduces High Current 80VDC Board-Mount EMI Filters

    Bourns Releases High Heat Tolerant TO-227 Thick Film Resistor

    TDK Increases Current Ratings of Automotive Thin-Film Power Inductors

    Sumida Announces New DC Common Mode Choke Coil Series

    KYOCERA AVX Releases New 3dB Hybrid Couplers

    SCHURTER Unveils High Voltage Fuses for EV Applications

    YAGEO Releases First to Market 750V Aluminum Capacitors

    binder Introduces M9 Compact Circular Connector

    Smolteks CNF-MIM Capacitors Meet Thermal and Voltage Stability Industry Requirements

    Trending Tags

    • Ripple Current
    • RF
    • Leakage Current
    • Tantalum vs Ceramic
    • Snubber
    • Low ESR
    • Feedthrough
    • Derating
    • Dielectric Constant
    • New Products
    • Market Reports
  • VideoFilter
    • All
    • Antenna videos
    • Capacitor videos
    • Circuit Protection Video
    • Filter videos
    • Fuse videos
    • Inductor videos
    • Inter-Connect Video
    • Non-linear passives videos
    • Oscillator videos
    • Passive sensors videos
    • Resistor videos

    Accelerating Full Bridge LLC Resonant Converter Design with Frenetic AI

    Understanding Switched Capacitor Converters

    Coupled Inductors Circuit Model and Examples of its Applications

    Inductor Resonances and its Impact to EMI

    Highly Reliable Flex Rigid PCBs, Würth Elektronik Webinar

    Causes of Oscillations in Flyback Converters

    How to design a 60W Flyback Transformer

    Modeling and Simulation of Leakage Inductance

    Power Inductor Considerations for AI High Power Computing – Vishay Video

    Trending Tags

    • Capacitors explained
    • Inductors explained
    • Resistors explained
    • Filters explained
    • Application Video Guidelines
    • EMC
    • New Products
    • Ripple Current
    • Simulation
    • Tantalum vs Ceramic
  • Knowledge Blog
  • Suppliers
    • Who is Who
  • Events
No Result
View All Result
Passive Components Blog
No Result
View All Result

Capacitor Energy Density and Power Density

27.2.2025
Reading Time: 4 mins read
A A

Energy density and power density are two crucial yet distinct metrics in the field of energy storage. Understanding the differences between these two metrics is essential for designing efficient energy storage solutions. This blog delves into the nuances of energy density and power density, shedding light on their impact on capacitor performance.

Comparing Energy Density and Power Density 

Energy density describes the amount of energy stored in a mass (Wh/kg or J/kg) or volume (Wh/L). High energy density implies the system can store a lot of energy in space- and weight-constrained spaces. This is particularly useful in applications like mobile devices and electric vehicles where board space is a luxury and long-term energy storage is critical for operational efficiency. 

RelatedPosts

Capacitor Charging Losses Explained

Supercapacitor Balancing Methods Comparison

Failure Analysis of Capacitors and Inductors

While frequently mentioned together in energy storage discussions, energy density and power density represent distinct performance characteristics. Power density describes how quickly energy can be delivered or absorbed into a system in W/kg or W/m3. High power density tells us a system can release or accept energy at a fast pace. This characteristic best serves applications that require quick bursts of energy like camera flashes or industrial lasers. 

In short, energy density focuses on storage capacity while power density measures the rate of energy transfer, and systems designers are expected to balance the two. For example, batteries with high energy density may not be able to deliver energy as quickly as supercapacitors, which are known for their high power density. 

Energy and Power Density Math 

Calculate the energy stored in a capacitor using:

where

  • C is capacitance
  • Vr is the voltage rating of the capacitor.

To find the volumetric energy density of a capacitor, divide Er by volume: 

The power rating of a capacitor can be estimated from the rated voltage and current as :

Power density is Pr  divided by volume: 

Alternatively, another approach to determining power density is to examine the impedance-matched condition, where the load matches the source impedance (i.e., the capacitor’s equivalent series resistance (ESR)). Under these conditions, we find: 

Then, power density is calculated as: 

This method reveals that capacitors with high power density require a low ESR to maximize the rate of energy transfer. As a result, innovation in capacitor design focuses on optimizing capacitance and voltage within a compact volume while minimizing internal losses from ESR. 

To see how supercapacitors leverage their high power density for real-world applications like backup power and load management, read Supercapacitors in Action: Enhancing Backup Power and Load Management. 

Related

Recent Posts

YAGEO Releases First to Market 750V Aluminum Capacitors

30.6.2025
33

Smolteks CNF-MIM Capacitors Meet Thermal and Voltage Stability Industry Requirements

30.6.2025
16

Learn How Supercapacitors Enhance Power System in Knowles eBook

30.6.2025
12

TDK Releases Industry First 1uF 100V X7R MLCCs in 1608 Case

27.6.2025
17

YAGEO Extends Lifetime of its Aluminum SMD Chip Capacitors to 5500hrs at 125C/Ur

27.6.2025
19

Murata Releases Worlds First 10µF/50V Automotive MLCC in 0805 Size

26.6.2025
47

Advancements and Applications of Switch Capacitor Power Converters

25.6.2025
33

Accelerating Full Bridge LLC Resonant Converter Design with Frenetic AI

24.6.2025
23

Samsung Delivers Silicon Capacitors to Marwell AI Systems

24.6.2025
60

Smolteks CNF MIM Capacitor Break 1 µF/mm²

19.6.2025
40

Upcoming Events

Jul 23
13:00 - 14:00 CEST

PCB design for a Smartwatch

Jul 29
16:00 - 17:00 CEST

Impact of Elevated Voltage and Temperature on Molded Power Inductors in DC/DC converters

View Calendar

Popular Posts

  • Buck Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • Boost Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • Flyback Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • What is a Dielectric Constant and DF of Plastic Materials?

    4 shares
    Share 4 Tweet 0
  • LLC Resonant Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • Ripple Current and its Effects on the Performance of Capacitors

    3 shares
    Share 3 Tweet 0
  • How to Design an Inductor

    0 shares
    Share 0 Tweet 0
  • Dual Active Bridge (DAB) Topology Explained

    0 shares
    Share 0 Tweet 0
  • SEPIC Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • Why Low ESR Matters in Capacitor Design

    0 shares
    Share 0 Tweet 0

Newsletter Subscription

 

Passive Components Blog

© EPCI - Leading Passive Components Educational and Information Site

  • Home
  • Privacy Policy
  • EPCI Membership & Advertisement
  • About

No Result
View All Result
  • Home
  • Knowledge Blog
  • Premium Suppliers

© EPCI - Leading Passive Components Educational and Information Site

This website uses cookies. By continuing to use this website you are giving consent to cookies being used. Visit our Privacy and Cookie Policy.
Go to mobile version