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Coin cell with the largest continuous current?

Matt Shira
Expert 2180 points
Other Parts Discussed in Thread: CC2500

Hi,

In our application we need coin cells that could supply continuous current of about 15mA for at least 5 seconds. I checked many CR2032 brands and most of them have continuous rating larger than 0.2mA.

Could anyone tell me if there exist any larger (more bulky) types of coin cell that could supply such a large current?

 

Matt

  • 0
    TI__Guru**** 317180 points

    Take a look at http://www.ti.com/lit/wp/swra349/swra349.pdf

  • 0 in reply to TER
    Expert 2180 points

    TER,

    Thanks, I am reading the paper now.

    Matt

  • 0 in reply to TER
    Expert 2180 points

    TER,

    We are considering a possible solution:

    The LR932 cell is rarely used separately according to Wikipedia - List of battery sizes (search “LR932” on the page). When eight of them are used in A23 battery, the battery provides 12V voltage and supplies 15mA current for extended period (see Energizer datasheet).

    Therefore it seems that I can infer from this that each individual LR932 can supply 15mA current for extended period individually and this 15mA current is not in any sense its “peak” current, unlike CR2032.

    Then for CC2500 whose required voltage range is [1.8, 3.6]V, it seems that stacking two LR932 together is an ideal solution comparing with one CR2032 because we no longer need to worry about restricting TX/RX time to brief pulses as described in SWRA349.

    Could you share your opinion on this?

     

    Matt

  • 0 in reply to Matt Shira
    Genius 3370 points

    The continuous current rating you quote for a coin cell is for 100% capacity. The max rated continuous discharge current for 2032 coin cell is 3 mA with 30% capacity loss. For pulsed, the current should be even higher. I have seen data that shows coin cell to be capable of up to 50 ma discharge pulses 100 ms in duration(with a 0.75V drop in output voltage during the pulse).