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How to maximize the rechargeable battery lifetime by optimizing the charging circuit design?

Jeff Chou78
Prodigy 190 points

Hi, Sir:

We are doing a project with rechargeable battery inside. Team is discussing if we can maximize the rechargeable battery lifetime by optimizing the charging circuit design.
Shall we keep charging the battery when the DC power source is there? or not always charge the battery but discharge it after is is charged to specific level, say 85% or else level and then charge it when the level goes below specific level?
Could you please give us some advises about the best charging circuit design to maximize the battery life time?

Thank you so much.

Jeff

  • 0
    TI__Mastermind 42535 points

    Hi Jeff,

    It's better to not continuously charge the battery when the charger is there. This is because you can change the cell impedance by memory effect at high state of charge. The better option is to let it discharge to a lower value and then recharge it. A value of 60% for recharge is advisable.

  • 0 in reply to Batt
    Prodigy 190 points

    Hi, Batt:

    Could you recommend a reference design so we can refer to it and then generate one for our product?

    Normally, the warranty excludes the rechargable battery but our customer ask us to extend the battery lifetime by optimizing the charging circuit.

    Like go charging the battery when the value below 60% and then discharge the battery when the value reaches 95%? (Is 95% the good level to maintain the long battery life time?)

      

    Thank you

    Jeff

  • 0 in reply to Jeff Chou78
    TI__Mastermind 42535 points

    Hi Jeff,

    Please post the question to chargers for a charger reference circuit. Ideally about 80-90% is a good threshold to improve battery life.