Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Design Considerations For PPTC Devices Used In Battery Packs
Post: #1

by Matthew Galla Materials and Process Development

Circuit protection for rechargeable lithium-based battery cells and packs is a critical design consideration. Overcurrent and overtemperature conditions that can result from accidental shorting or abusive/runaway charging can raise temperatures high enough to damage components and cause substantial equipment damage.
Early circuit-protection designs relied on fragile one-shot fuses to provide total current interruption for overcurrent protection. However, because the majority of fault conditions that a battery pack encounters are relatively infrequent or intermittent events, a resettable protection device is generally preferable.

Today, Li-ion packs typically include an active overvoltage and overcurrent detecting safety circuit (IC and MOSFETs) as the primary pack protection, and a polymeric positive temperature coefficient (PPTC) device in series as a second level of protection. Although the semiconductor circuitry is considered reliable, there are conditions under which failure of the primary protection may occur, such as excessive electrostatic discharge, high temperature, or oscillation during a short circuit condition. In these cases, the PPTC device provides both short-circuit and overcharge protection.

For emerging Li-ion cell technologies, such as Li-P and Li-Mn, the increased level of safety inherent in the cell design has led some OEM pack designers to eliminate the IC safety circuit and rely on a PPTC device as the primary short-circuit and overcharge protection (Fig. 1.) An optional secondary passive element, in the form of a current fuse or thermal fuse, is sometimes included if protection is needed beyond the rated voltage of the PPTC device.

read full report

Important Note..!

If you are not satisfied with above reply ,..Please


So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Popular Searches: ieee paper for battery optimizer for android mobile devices, how to used, mechanism used in a sentence, list of agrochemical used in farmland, polymeric positive temperature coefficient for protection of battery packs pdf, ppt advanced safety devices used in automobile, electronic devices used in computer science for seminar,

Quick Reply
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Multilevel inverter for power system applications highlighting asymmetric design effe seminar topics 2 3,369 29-12-2012 11:22 AM
Last Post: seminar details
  terahertz transistor design computer science crazy 1 1,351 21-11-2012 11:55 AM
Last Post: seminar details
  PPTC Devices for Protection of Battery Packs computer science crazy 5 4,190 22-10-2012 12:10 PM
Last Post: seminar details
  Battery charger circuit using SCR. computer girl 0 796 11-06-2012 04:09 PM
Last Post: computer girl
  Design and Application of Radio Frequency Identification Systems computer girl 0 579 09-06-2012 04:15 PM
Last Post: computer girl
  Design of 2-D Filters using a Parallel Processor Architecture computer science crazy 3 3,000 18-02-2012 10:36 AM
Last Post: seminar paper
  Cruise Control Devices electrical engineering 9 6,218 15-02-2012 03:22 PM
Last Post: seminar paper
  Liquid electricity- vanadium redox battery computer science crazy 1 3,939 02-02-2012 10:57 AM
Last Post: seminar addict
  Super wideband fractal antenna design project report helper 1 1,731 16-01-2012 10:33 AM
Last Post: seminar addict
  A Neuro-Genetic System Design for Monitoring Driver’s Fatigue seminar class 2 1,523 26-08-2011 09:55 AM
Last Post: seminar addict