Professional Lithium Battery Pack & BMS Solutions

20+ Years of Excellence in Lithium System Integration

Since 2005, Ryder Electronics (Shenzhen Ryder Electronics Co., Ltd.) has been a trusted leader in smart energy solutions. As a National High-Tech Enterprise and a "Specialized and Sophisticated" enterprise, we focus on the R&D, design, and manufacturing of intelligent lithium battery packs, battery management systems (BMS), chargers, and energy storage systems. In 2021, we established Huizhou Ryder New Energy Industrial Base (50 acres, 84,000㎡ GFA), integrating R&D, SMT, cell PACK, and logistics under one roof.

Core Technology: Series & Parallel Configurations for Lithium Batteries

Single cells have limited voltage and capacity. To meet real-world power demands, we combine cells in series, parallel, or series-parallel configurations:

Series: Voltage adds up, capacity remains the same, internal resistance increases.

Example: 3.7V cells → 3.7×(N)V (7.4V, 12V, 24V, 36V, 48V, 60V, 72V, etc.)

Parallel: Capacity adds up, voltage unchanged, internal resistance decreases → longer runtime.

Example: 2200mAh cells → 2×(N)mAh (4400mAh to 100Ah+)

Series-Parallel: Both voltage and capacity increase for high-power applications.

Custom Calculation Example (48V 20Ah with 18650 3.7V 2000mAh cells)

Series: 48V / 3.7V ≈ 13 cells in series (13S)

Parallel: 20Ah / 2Ah = 10 cells in parallel (10P)

Total cells: 13S × 10P = 130 cells

We support all common chemistries: LiCoO₂ (3.7V), NMC (3.6V), LiFePO₄ (3.2V), LTO (2.4V).

Precision Cell Matching for Safety & Performance

To avoid overcharging, over-discharging, or thermal runaway, every cell must be strictly matched:

Voltage difference ≤10mV

Internal resistance difference ≤5mΩ

Capacity difference ≤20mA

We use advanced battery management systems (BMS) with protection against overcharge, over-discharge, overcurrent, short circuit, and NTC temperature control. Never mix different brands, voltages, capacities, old/new cells, or chemistries (e.g., NiMH with Li-ion).

Intelligent PACK Manufacturing

Our lithium battery PACK (Processing, Assembly, Packaging) includes:

High-quality Li-ion cells (18650, 21700, pouch, prismatic)

Custom PCM/BMS with active/passive balancing

Plastic shells, nickel strips, brackets, and custom terminals/wires

Full SMT assembly and automated production lines

We support both parallel-first then series (common for e-buses) and series-first then parallel (preferred for grid storage and better cell monitoring). Each topology is optimized for your application.

Charging Solutions – Series vs. Parallel

Series charging: Low cost, but requires BMS to cut off when any cell reaches overcharge protection voltage (otherwise other cells may not be fully charged).

Parallel charging: Needs balanced charging. We recommend using a single, dedicated protection board for all paralleled cells. Never parallel charge protected and unprotected cells together. Use only 4.2V chargers for Li-ion (no 5V chargers).