How Partial Discharge Reduces Stress on Lithium-Ion Batteries
Partial discharge reduces stress on lithium-ion batteries primarily by limiting the depth of discharge (DoD). Here are key ways this practice helps:
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Reduced Chemical Changes:
- When a lithium-ion battery is fully discharged (100% DoD), it undergoes more significant chemical changes than partial discharges. These changes can lead to increased stress on the battery’s internal components, such as electrodes.
- By maintaining the battery between 50% and 100% state of charge, you minimize these chemical shifts, which helps prolong the battery’s lifespan.
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Less Electrode Wear:
- Full discharges cause more pronounced electrode wear due to the larger movements of lithium ions between the anode and cathode.
- Partial discharges keep the electrodes more stable, reducing wear and tear over time.
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Temperature Impact Mitigation:
- Although temperature itself is a significant factor in battery stress, maintaining partial discharge can help mitigate the effects of heat. High temperatures exacerbate chemical reactions and wear, especially during full discharges.
- Keeping the battery in a partial state can help distribute and manage these thermal effects more evenly.
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Avoidance of High Voltage Stress:
- Lithium-ion batteries experience stress when kept at high charge levels (near 100% SoC) for extended periods, as this can lead to oxidation and degradation.
- Partial discharges help avoid these high-voltage conditions, reducing oxidative stress on the battery.
In summary, partial discharge reduces battery stress by minimizing chemical changes, electrode wear, and thermal impacts, all of which contribute to a longer battery lifespan.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/how-does-partial-discharge-specifically-reduce-stress-on-a-battery/
