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Electrical Performance & Lithium Cell Design

At LARGE, we take a full-chain approach to electrical performance engineeringócovering cell selection, voltage platforms
capacity configuration, discharge-rate requirements, cycle life, and temperature adaptability.
Through system-level matching and rigorous validation, we ensure stable, reliable operation in high-power, high-reliability, and wide-temperature-range applications.

Why Electrical Performance Design Determines Final Device Performance?

Many device-level issues originate from poor alignment between the cell chemistry, voltage platform strategy, and thermal management. Common challenges include:

Unstable power output or startup failure

Insufficient voltage platforms or peak current capability can cause voltage drop, false protection triggers, and startup issues.

Gap Between Rated and Actual Runtime

Capacity and cycle life not matched to real operating conditions

• Premature aging

• Frequent battery replacement

Overheating under high load

Inappropriate C-rate selection or pack topology can result in over-temperature conditions and power derating.

Performance degradation due to cell inconsistency

Poor series-parallel design increases voltage deviation and accelerates capacity loss.

Inaccurate SOC and unexpected shutdowns

Suboptimal BMS algorithms cause inaccurate state-of-charge readings and imbalance issues.

High temperature sensitivity and poor environmental adaptability

Lack of thermal management leads to reduced low-temperature performance and accelerated aging at high temperatures.

System-Level Electrical Performance Customization for Lithium Batteries

Driven by application requirements and cost targets, we
deliver electrical performance customization from
material selection to system-level engineeringóensuring
an optimal balance between performance, reliability, and
total cost of ownership.

Cell Chemistry & Performance Customization

Based on application scenarios, safety levels, and cost objectives, we provide full-cycle cell customization—from chemistry selection to specialized performance tuning.

LFP – High safety & long cycle life

NCM – High energy density

LCO – Highvoltage platform

LMO – High power & thermal stability

Low-Temperature

Explosion-Proof

Non-Magnetic

Semi-Solid-State

Long-Life

High C-Rate

Voltage Platform Customization (3.2V-72V+)

Tailored voltage architectures based on load power, system efficiency, and space constraints:

Series / parallel cell & module topologies

Standard platforms: 12V / 24V / 36V / 48V / 60V / 72V

Scalable and modular voltage architectures

Capacity Customization (mAh - Ah)

Capacity is precisely configured to match real runtime targets
across portable and industrial systems.

Runtime-driven capacity configuration

Capacity tolerance within ±3%

Optimized balance of weight & energy density

Discharge Rate Customization (1-5C / 10C+ Peak)

Designed for fast startup, heavy-load driving, and high-power

High peak-current capability

High-frequency pulse load optimization

Dedicated high-power solutions

Cycle Life Engineering & TCO Optimization

Cycle life is engineered through coordinated optimization of
materials, voltage windows, and BMS strategies.

Extended-life systems: >3000 cycles

Industrial standard: 1000-1500 cycles

Cost-optimized solutions: 600-800 cycles

LARGE's Specialty Lithium Cell Solutions

Low-Temperature Cell
18650 | 2200mAh

Certified for nail penetration and explosion-proof performance

-40°C, 0.5C discharge capacity >70%

Compliant with Ex ic IIB T4 Gc explosion-proof standards

Low-Temperature LFP Cell
3.2V | 20Ah

Supports charging at -20°C

Passed nail penetration testing

-40°C, 3C discharge capacity ≥70%

Semi-Solid-State High Energy
Density Cell

Energy density: 250-350 Wh/kg

Cycle life: 600-1500 cycles (80% capacity retention)

Passed Nail penetration,Crush,Fire exposure testing

Lithium Battery Performance Testing & Validation

Our in-house laboratory covers the full scope of electrical performance validationófrom capacity and discharge rates to cycle life and accelerated aging—delivering reproducible data, traceable results, and comprehensive test reports.

Capacity & C-Rate Testing

Evaluate capacity retention and internal resistance under different temperatures and discharge rates.

Cycle Life Testing

Multi-condition cycling tests with degradation curves and lifetime prediction (TTF – Time to Failure).

Safety & Abuse Testing

Simulation tests including short circuit, nail penetration, crush, and overcharge/over-discharge, in coordination with third-party certification bodies.

FAQ

Can the capacity of a custom lithium battery cell be precisely tailored to my device requirements?

Yes. Capacity can be adjusted on demand, with tolerances controlled within ±3%, ensuring consistency for mass production.

Does high C-rate customization reduce battery lifespan?

By selecting specialized materials and optimizing BMS protection and thermal management strategies, we achieve a balanced design between high discharge rates and cycle life.

What is the lowest temperature your low-temperature cells can operate at?

Depending on the cell chemistry, our solutions support discharge down to -40°C and charging down to -20°C. Corresponding test reports are provided.

What certifications and test reports can you support?

We support certification testing such as UN38.3, IEC 62133, and UL, and provide third-party accredited test reports as required.

How to charge a lithium cell?

Use a charger designed for lithium-ion batteries, following the recommended voltage and current. Avoid overcharging or deep discharging.

What is the typical lithium-ion battery cell voltage?

Nominal voltage is usually 3.6–3.7V per cell, fully charged voltage is 4.2V, and cut-off voltage is around 2.5–3.0V.

Are lithium-ion batteries considered dry-cell batteries?

Yes, lithium-ion batteries are generally classified as dry-cell batteries because they use a non-liquid electrolyte.

Gel cell battery vs lithium

Gel cells are lead-acid batteries with gel electrolyte, heavier and lower energy density. Lithium-ion cells are lighter, higher energy density, and longer lifespan.

What are common lithium battery cell sizes?

Standard cylindrical sizes include 18650, 21700, 26650, while prismatic and pouch cells vary widely depending on design.

Are lithium-ion batteries considered wet-cell batteries?

No, lithium-ion batteries are not wet-cell batteries; they use a non-liquid electrolyte, unlike traditional flooded lead-acid batteries.

Request Your Custom Lithium Battery Pack Evaluation

Tell us about your device and application needs.
We'll provide a tailored evaluation covering cell design, BMS strategy, structure, thermal management and safety engineering.