Li-Ion Battery 21700 8s3p With Adapter And Charging Station 3D Printer Model Free Download

Description Files (12)

Summary

This is an eight in series, three in parallel (8s3p) lithium ion battery pack using 21700 cells, and is suitable for powering for small vehicles. It features a battery-to-vehicle adapter and a charging station. You can use any 21700 cell you wish: here I use Molicel P45B. The reason to use lithium ion cells is because they have higher specific energy than lithium polymer (Li-Po) batteries, which equates to longer flight time. Higher specific energy means lower mass for the same energy capacity, which translates to either longer flight time or higher payload mass.

Battery Specifications

Model: Molicel P45B
Nominal voltage: 28.8 [V]
Nominal max charge capacity: 13.5 [Ah]
Actual max charge capacity (via capacity tester): 11.6 [Ah]
Max continuous current: 90 [A]
Mass: 1.884 [kg]

Derived Battery Specifications:

Nominal energy capacity: 388.8 [Wh]
Actual energy capacity: 334.1 [Wh]
Nominal specific energy: 206 [Wh/kg]
Actual specific energy: 178 [Wh/kg]

Bill of Materials:

21700 Battery Cells:

Molicel P45B, quantity 24

Bolts:

M3-8[mm], quantity 2
M3-10[mm], quantity 2
M3-16[mm], quantity 6
M3-18[mm], quantity 2
M3-20[mm], quantity 2

Nuts:

M3 nylock, quantity 4

Wires:

Red 22[AWG] silicone
Black 22[AWG] silicone
Red 10[AWG] silicone
Black 10[AWG] silicone

Filament:

Black PETG
White PETG

Connectors:

MISTA MSD-DB01 female 12 pin, quantity 1
MISTA MSD-DB01 Male 12 pin, quantity 2
JST-XH female 9 pin, quantity 2
JST-XH male 9 pin, quantity 1
XT-60 female, quantity 2

Conductive Strip:

Nickel, >99% purity, 0.2[mm] x 10[mm], length = 1[m]
Copper, >99% purity, 0.2[mm] x 10[mm], length = 1[m]

Spring with wire thickness = 0.4[mm], OD = 14[mm], free length = 15 [mm], quantity 1

Purchase links:

There are three assemblies to build:

Battery
Battery Adapter
Battery Charging Station

Instructions to build these are presented at https://www.thingiverse.com/thing:6364753

BatteryAdapter_base.STL	266.4KB
BatteryAdapter_powerConnClamp.STL	45.7KB
BatteryAdapter_pushButton.STL	61.5KB
BatteryAdapter_pushButtonPlate.STL	39.3KB
BatteryChargingStation_balanceConnClamp.STL	38.6KB
BatteryChargingStation_base.STL	32.8KB
BatteryChargingStation_powerConnClamp.STL	31.6KB
Battery_balanceConnClamp.STL	42.1KB
Battery_base.STL	179.6KB
Battery_frame.STL	423.3KB
Battery_powerConnClamp.STL	54.3KB
Battery_topCover.STL	106.9KB