The **32140-R** typically refers to a high-capacity **Lithium Iron Phosphate (LiFePO4)** cylindrical battery cell. These cells are widely used in electric vehicles (EVs), solar energy storage, and power tools due to their safety profile and high energy density. --- ### 1. Technical Specifications The "32140" designation refers to the physical dimensions: **32mm** in diameter and **140mm** in height. | Feature | Typical Specification | | :--- | :--- | | **Chemistry** | Lithium Iron Phosphate (LiFePO4) | | **Nominal Voltage** | 3.2V | | **Capacity** | 10Ah to 15Ah (depending on manufacturer) | | **Charging Cut-off Voltage** | 3.65V | | **Discharge Cut-off Voltage** | 2.0V - 2.5V | | **Cycle Life** | 2,000 to 4,000+ cycles | | **Standard Discharge Rate** | 1C - 3C | --- ### 2. Key Component Characteristics The "-R" suffix often denotes a specific variant (such as "Rechargeable" or a specific terminal type like a threaded bolt). * **Anode and Cathode:** Uses Iron Phosphate ($LiFePO_4$) as the cathode material, which is chemically stable and resistant to thermal runaway. * **Form Factor:** The large cylindrical shape allows for better heat dissipation compared to prismatic cells of the same capacity. * **Terminal Design:** Most 32140-R cells feature **threaded studs** (M4 or M6) or flat tabs, making them easy to assemble into battery packs using busbars without specialized spot welding. --- ### 3. Advantages and Applications #### Advantages: * **Safety:** Unlike Li-ion (NMC), LiFePO4 does not catch fire easily if punctured. * **Longevity:** Lasts significantly longer than lead-acid or standard lithium batteries. * **Environmental Impact:** Contains no cobalt or nickel, making it more ethical and easier to recycle. #### Common Applications: 1. **Electric Vehicles:** E-bikes, scooters, and golf carts. 2. **Solar Storage:** Home ESS (Energy Storage Systems) and off-grid power walls. 3. **Portable Power:** Large power stations and UPS backups. --- ### 4. Connection Logic Example When building a pack with these cells, you calculate the configuration as follows: ```python # Simple Python calculation for a 12V 30Ah Battery Pack # using 32140-R 15Ah cells nominal_voltage = 3.2 cell_capacity = 15 # Ah # To get 12.8V (4S) and 30Ah (2P) series_count = 4 parallel_count = 2 total_voltage = series_count * nominal_voltage total_capacity = parallel_count * cell_capacity print(f"Pack Configuration: 4S2P") print(f"Total Voltage: {total_voltage}V") print(f"Total Capacity: {total_capacity}Ah") ```