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battery-dat/battery-pack-dat/battery-pack-build-dat/2026-05-20-02-29-55.png
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battery-dat/battery-pack-dat/battery-pack-build-dat/battery-pack-build-dat.md
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| 1 | +
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| 2 | +
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| 3 | +# battery-pack-build-dat
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| 4 | +
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| 5 | +
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| 6 | +- [[battery-pack-dat]] - [[battery-pack-kit-dat]] - [[battery-pack-materials-dat]] - [[battery-pack-build-dat]]
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| 7 | +
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| 8 | +- this build has no battery holder inside, only use - [[heat-shrink-tube-dat]] for compact and small size build
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| 9 | +
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| 10 | +
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| 11 | +
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| 12 | +
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| 13 | +
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| 14 | +## ref
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| 15 | +
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battery-dat/battery-pack-dat/battery-pack-dat.md
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| 5 | 5 | |
| 6 | 6 | - [[battery-holder-dat]] - [[battery-holder-18650-dat]] - [[battery-holder-AA-dat]]
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| 7 | 7 | |
| 8 | -- [[battery-pack-dat]] - [[battery-pack-kit-dat]] - [[battery-pack-materials-dat]]
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| 8 | +- [[battery-pack-dat]] - [[battery-pack-kit-dat]] - [[battery-pack-materials-dat]] - [[battery-pack-build-dat]]
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| 9 | 9 | |
| 10 | 10 | - [[battery-pack]] - [[battery-size-dat]] - [[battery-li-dat]]
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| 11 | 11 |
battery-dat/battery-pack-dat/battery-pack-dimension-dat/battery-pack-dimension-dat.md
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| 1 | +
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| 2 | +
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| 3 | +# battery-pack-dimension-dat
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| 4 | +
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| 5 | +2x2 18650 battery == 66 x 40.5 x 40.5 mm (with spacers and insulation)
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| 6 | +
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| 7 | +65+1 x 18+18+4.5
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| 8 | +
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| 9 | +for [[heat-shrink-tube-dat]] == 106.5 + 10 or 81 + 10
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| 10 | +
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| 11 | +
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| 12 | +
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| 13 | +
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| 14 | +## Dimensions Calculation for a 2x2 18650 Battery Pack Layout
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| 15 | +
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| 16 | +The dimensions for a 2x2 layout of 18650 cells are derived from the standard physical specifications of a single cell, where the designation **18650** defines its nominal size:
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| 17 | +* **18**: Diameter of 18 mm
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| 18 | +* **65**: Length/Height of 65 mm
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| 19 | +* **0**: Denotes a cylindrical form factor
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| 20 | +
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| 21 | +For a small 4-cell square assembly, a standard **Matrix Layout** (flat grid alignment) is preferred over an interleaved honeycomb pattern.
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| 22 | +
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| 23 | +---
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| 24 | +
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| 25 | +### 1. Theoretical Minimum Dimensions (Bare Cells Only)
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| 26 | +
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| 27 | +These figures represent the absolute physical boundaries of the cells resting directly against one another without any structural packaging, wiring, or isolation gaps:
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| 28 | +
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| 29 | +* **Length (Z-axis):** Constant height of a single cell = **65 mm**
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| 30 | +* **Width (X-axis):** 2 diameters side-by-side = 18 mm * 2 = **36 mm**
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| 31 | +* **Height/Thickness (Y-axis):** 2 diameters stacked = 18 mm * 2 = **36 mm**
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| 32 | +
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| 33 | +> **Ideal Envelope Volume:** 65 mm * 36 mm * 36 mm
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| 34 | +
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| 35 | +---
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| 36 | +
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| 37 | +### 2. Practical Engineering Dimensions (Recommended for CAD & Enclosure Design)
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| 38 | +
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| 39 | +In real-world applications, cells should not touch metal-to-metal due to short-circuit hazards. You must factor in processing variables and safety materials:
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| 40 | +1. **Plastic Interlocking Spacers (Brackets):** Standard interlocking 18650 grid spacers have an outer edge dimension of 20.2 mm per cell slot to allow air-cooling gaps and structural spacing.
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| 41 | +2. **Top/Bottom Fishpaper:** Adds about 0.3 mm to the longitudinal stackup.
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| 42 | +3. **Outer PVC Heat-Shrink Tubing:** Adds around 0.5 mm to 1.0 mm around the finished perimeter.
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| 43 | +
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| 44 | +#### Option A: Pack Assembled with Standard Plastic Modular Spacers (Best Practice)
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| 45 | +*This is the standard for robots, vehicles, and high-vibration applications.*
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| 46 | +* **Length:** 65 mm (cell) + 0.3 mm (fishpaper) + 0.7 mm (nickel/wrap tolerance) = **66.0 mm**
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| 47 | +* **Width:** 20.2 mm * 2 = **40.4 mm**
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| 48 | +* **Height:** 20.2 mm * 2 = **40.4 mm**
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| 49 | +
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| 50 | +#### Option B: Wrapped Pack Without Spacers (Glue + Heat-Shrink Only)
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| 51 | +*Utilized for tight space constraints where spacers cannot physically fit.*
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| 52 | +* **Length:** **66.0 mm**
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| 53 | +* **Width:** (18 mm * 2) + 1.0 mm (insulation/wrap allowance) = **37.0 mm**
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| 54 | +* **Height:** (18 mm * 2) + 1.0 mm (insulation/wrap allowance) = **37.0 mm**
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| 55 | +
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| 56 | +---
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| 57 | +
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| 58 | +### 3. Design and Tolerancing Advice
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| 59 | +
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| 60 | +> ⚠️ **Mechanical Clearance Tip:** When modeling 3D-printed battery cradles, CNC-machined enclosures, or laser-cut mounting plates for your hardware projects, always implement a **1.0 mm to 1.5 mm design tolerance/clearance buffer** on each axis past your option numbers. This prevents assembly interference caused by variations in adhesive thickness, solder joints, or 3D printer material shrinkage.
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| 61 | +
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| 62 | +
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| 63 | +## ref
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| 64 | +
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| 65 | +
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cable-dat/heat-shrink-tube-dat/2026-05-20-02-20-01.png
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cable-dat/heat-shrink-tube-dat/heat-shrink-tube-dat.md
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| 1 | 1 | |
| 2 | 2 | # heat-shrink-tube-dat
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| 3 | 3 | |
| 4 | +common materials == [[PVC-dat]]
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| 4 | 5 | |
| 5 | 6 | ## for battery insulation and protection
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| 6 | 7 | |
| 7 | 8 | 
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| 8 | 9 | |
| 10 | +
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| 11 | +- 压扁宽度 = 17mm/5米（可套单节7号电池）
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| 12 | +- 压扁宽度 = 23mm/5米（可套单节5号电池）
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| 13 | +- 压扁宽度 = 29.5mm/5米（可套单节18650电池）
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| 14 | +- 压扁宽度 = 36mm/5米（可套单节21700电池）
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| 15 | +- 压扁宽度 = 43mm/5米（可套单节26650电池）
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| 16 | +
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| 17 | +产品名称：各种规格的PVC热缩套管 收缩膜 封装套管皮
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| 18 | +产品规格：压扁宽度23mm--450MM，（单边壁厚0.08mm----0.25MM）
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| 19 | +收缩温度：80℃；
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| 20 | +温度范围：-40℃～105℃；
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| 21 | +耐温等级：105℃；
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| 22 | +收缩率：≥48±5%；
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| 23 | +额定电压：300V；
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| 24 | +产品包装：100/米；
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| 25 | +产品颜色：蓝色
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| 26 | +产品定制：可定制（PVC热缩套管颜色，压扁宽度，厚度均可以按要求定制）
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| 27 | +
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| 28 | +产品特点：具有优良的环保、绝缘、性能稳定、收缩温度低、收缩快等优点；
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| 29 | +
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| 30 | +应用范围：广泛用于铝、电解电容器、电池、电子元器件、灯饰、LED引脚、瓶口的组合包装等，对被包覆物起到美化外观、绝缘、防潮、防腐、防尘的作用。
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| 31 | +
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| 32 | +使用贴士：对于短小的热缩管，可使用热吹风来完成收缩，相对直径较大或较长的热缩管，可用热风枪等工具加热使之完全收缩。
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| 33 | +
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| 34 | +
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| 35 | +## calculation
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| 36 | +
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| 37 | +- [[battery-pack-dimension-dat]]
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| 38 | +
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| 39 | +
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| 40 | +
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| 41 | +
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| 42 | +
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| 43 | +
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| 44 | +- 竖套=（长+宽）
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| 45 | +- 横套=（高+宽）
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| 46 | +
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| 47 | +
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| 48 | +
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| 9 | 49 | ## color
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| 10 | 50 | |
| 11 | 51 | - transparent
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