♻️ Battery Cycle Life & DoD Calculator

Mission charge/discharge cycles · max allowed DoD per chemistry · cycles-vs-DoD curves

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Mission

Results

Cycles per day
–
Cycles per year
–
Mission cycles
–
Max DoD — Li-ion
– %
Max DoD — NiH₂
– %
Max DoD — NiCd
– %

Cycle Life vs DoD

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📖 How to use

  1. Enter the orbit period, the share of orbits that see eclipse and the mission life — each eclipse is one battery cycle.输入轨道周期、经历地影的轨道比例与任务寿命——每次地影即一次电池充放循环。
  2. LEO sees ~15 cycles/day (≈ 27 000 in 5 yr); GEO only ~90/yr during the two eclipse seasons — hence GEO batteries may run much deeper DoD.LEO 每天约 15 次循环（5 年约 2.7 万次）；GEO 仅在两个地影季约 90 次/年——所以 GEO 电池可以用更深的 DoD。
  3. Read the max DoD per chemistry at your cycle count and feed it into Battery Sizing and Energy Balance.读取该循环数下各体系的最大 DoD，填入蓄电池与能量平衡工具。
  4. The curves are generic heritage fits — always derate to your cell vendor's qualification data for flight.曲线为通用工程拟合——正样设计务必以电芯厂商的鉴定数据为准并留降额。

Cycle life vs depth of discharge

Battery wear grows sharply with depth of discharge. This tool uses exponential heritage fits N = exp(a − b·DoD) anchored to widely-quoted space values (Li-ion ≈ 60 k cycles at 20% DoD, NiH₂ ≈ 40 k at 40%, NiCd ≈ 20 k at 25%). Inverting for the mission cycle count gives the max allowed DoD:

DoD_max = (a − ln N_mission)/b

The number of cycles is set by the orbit: one per eclipse. That is why LEO designs (tens of thousands of cycles) run 20–30% DoD while GEO designs (~1 350 cycles in 15 yr) can run 60–80%.

All computation runs locally in your browser.

循环寿命与放电深度

电池损耗随放电深度急剧增加。本工具采用指数型工程拟合 N = exp(a − b·DoD)，锚定常用宇航数据（锂离子 20% DoD 约 6 万次，氢镍 40% 约 4 万次，镉镍 25% 约 2 万次）。按任务循环数反解得最大允许 DoD：

DoD_max = (a − ln N_任务)/b

循环数由轨道决定：每次地影一次循环。因此 LEO（数万次循环）通常取 20–30% DoD，而 GEO（15 年约 1350 次）可取 60–80%。

全部计算在你的浏览器本地完成。