Battery Pack
1. Cells
● Basic units such as lithium-ion cells (18650, 21700, etc.), lithium iron phosphate cells, lead-acid batteries, etc.
● Connected in series (to increase voltage) or in parallel (to increase capacity).
2. Battery Management System (BMS)
● Monitors parameters such as voltage, current, and temperature to achieve functions such as overcharge/over-discharge protection, balanced charging, and fault alarm.
● Ensure safety and extend life.
3. Structural parts and thermal management system
● The housing (metal/plastic) provides mechanical protection.
● Heat dissipation design (air cooling/liquid cooling/phase change material) prevents overheating.
4. Electrical components
● Connectors, fuses, relays, wiring harnesses, etc. to ensure current transmission and safety.、
● By use: power battery packs (electric vehicles), energy storage battery packs (power grid), consumer electronics battery packs (laptops, mobile phones).
● By shape: square battery packs, cylindrical battery packs (such as Tesla's 4680), soft pack battery packs.
● By technology: lithium-ion, lead-acid, nickel-metal hydride, solid-state battery packs, etc.
1. Flexible adjustment of voltage and capacity
● Series connection to increase voltage: By connecting multiple cells in series, the requirements of high-voltage equipment can be met (such as electric vehicles that require 300V~800V high voltage). Example: The voltage of 4 3.7V lithium cells connected in series is 14.8V.
● Parallel connection to increase capacity: Parallel cells can increase the total capacity (Ah) and extend the battery life.
Example: The capacity of 3 2Ah cells connected in parallel is 6Ah.
2. Improve energy density and power output
● High energy density: By optimizing the spatial arrangement (such as Tesla's 4680 cylindrical battery pack), higher energy storage (Wh/kg) can be achieved.
● High-power discharge: Meet instantaneous high power requirements (such as electric vehicle acceleration and drone takeoff).
3. Enhance system reliability and safety
● Battery management system (BMS): Real-time monitoring of voltage, temperature, and current to prevent overcharging/over-discharging.
Cell balancing technology extends life.
Fault isolation (such as cutting off the circuit when a cell fails).
4. Adapt to complex application scenarios
● Modular design: the number of cells can be flexibly increased or decreased according to demand (such as the scale expansion of energy storage power stations).
● Environmental adaptability: through packaging and temperature control technology, it can work at extreme temperatures (-30℃~60℃).
5. Economic and convenient maintenance
● Cost optimization: large-scale production reduces the cost per Wh (such as the cost of power battery packs has dropped to less than $100/kWh).
● Easy to replace and maintain: modular design allows partial replacement of faulty cells, reducing maintenance costs.
6. Extend overall life
● Improved cycle life: BMS's intelligent management can reduce cell degradation, and the life is longer than that of a single battery. Example: A high-quality lithium battery pack can cycle more than 2,000 times.
Dongguan Huawen New Power Co., Ltd. is a professional lithium batteries manufacturer integrating R&D, production and sales. The company was established in 2015 and is located in Dongguan City, GUA.