Huawen's Solar Power Batteries for Home

Mini UPS: Small Power, Big Reliability — Development and Application
With the rise of smart devices and decentralized power demands, traditional large UPS systems no longer fit all applications. The Mini UPS (Miniature Uninterruptible Power Supply) emerged to fill this gap — offering a compact, smart backup solution built around modern lithium battery technologies.

1. Background and Evolution
The demand for portable power protection for small electronics like routers, smart cameras, and IoT gateways has grown rapidly. Traditional UPS systems are bulky, expensive, and often overkill for these smaller devices. Mini UPS solutions provide an ideal alternative — compact, cost-effective, and plug-and-play.

2. Technical Architecture
Mini UPS devices typically feature DC output powered by embedded rechargeable lithium batteries and are managed by a smart BMS (Battery Management System).


Battery: 18650 / 21700 lithium or LiFePO₄ cells (7.4V, 11.1V, 12.8V)
Input: DC 5V / 9V / 12V (constant current-constant voltage charging)
Output: 5V, 9V, 12V, or 24V DC
Switching: Seamless switch-over within ≤10ms
Protection: Overcharge, over-discharge, overcurrent, short-circuit, and temperature protection

Sample Specs (Huawen Mini UPS Series):
- Battery: 7.4V 5200mAh or 11.1V 7800mAh
- Input: DC 12V/2A | Output: 12V±5% (5V/9V/24V optional)
- Switching time: ≤10ms | Charging time: 4–6 hours
- Operating temperature: -10°C ~ +50°C | Interface: DC5521, USB, RJ45
3. Key Application Scenarios

Networking: Routers, modems, WiFi repeaters — stay online during outages
Security: Smart locks, cameras, doorbells — uninterrupted monitoring
Industrial IoT: PLCs, sensors, control units — ensure data continuity
Medical: Home oxygen machines, insulin pumps — critical operation backup
Smart Home: Gateways, lighting hubs, speakers — improved reliability

4. Lithium Battery Advantage



Aspect
Lead-acid
Lithium (NCM / LiFePO₄)




Energy Density
30–50 Wh/kg
120–250 Wh/kg


Cycle Life
300–500
800–3000+


Weight
Heavy
Light (1/3–1/4)


Discharge
Moderate
Stable, high current


Safety & Eco
Contains lead
No toxic elements, recyclable


Cost Efficiency
Lower upfront
Lower lifecycle cost



5. Future Trends & Huawen Solutions
As edge computing, AIoT, and smart security evolve, Mini UPS will continue to develop toward:


📱 Smart monitoring via app or cloud
📦 Ultra-compact structural design
🛡 Enhanced BMS with thermal, SOC, and SOH diagnostics
🌱 100% lithium-based and recyclable

Huawen New Power offers end-to-end Mini UPS customization, from battery pack design to PCBA integration and casing solutions. Our team supports OEM/ODM services to power your unique business scenario.

Conclusion
Mini UPS systems are no longer scaled-down versions of traditional UPS — they are smart, efficient energy tools essential for connected devices. With lithium battery advancements, their performance and reliability continue to improve. Huawen stands ready to deliver intelligent, compact backup power you can count on.

🔋 Browse Mini UPS Products | 📩 Contact for Custom Quote

Common Causes of Lithium Battery Swelling and How to Prevent It
Professional safety guide from Huawen New Power



Contents

What Is Battery Swelling?
Common Causes
Risks & Impacts
Prevention Methods
Cause vs. Prevention Table
Quick Visual Guide
Work with Huawen New Power



What Is Battery Swelling?
Battery swelling is the visible expansion of a lithium cell caused by internal gas generation and pressure build‑up. It indicates abnormal electrochemical reactions and should be treated as a safety warning.

Warning: Do not puncture, compress, or continue using a swollen battery. Power down the device if possible and arrange safe replacement and recycling.


Common Causes


1) Gas Generation from Side Reactions
Overcharge, deep overdischarge, or chronic high temperature accelerates electrolyte decomposition and produces gases (e.g., CO₂, O₂), which accumulate inside the sealed cell.

2) Overcharging / Overdischarging
Overcharge drives cathode/anode side reactions; overdischarge can dissolve copper from the anode current collector, increasing internal shorts and gas formation.

3) High Temperature
Operation above 60℃ or poor heat dissipation speeds up aging and gas generation.



4) Poor Cell Quality / Mismatch
Cells with impurities or large variance in capacity/IR are more prone to imbalance, heat, and gas formation—especially in packs.

5) Mechanical Damage / Internal Short
Impact, puncture, or manufacturing defects cause localized heating and swelling.





Risks & Impacts

Capacity Loss: Swollen cells typically exhibit reduced usable capacity.
Device Malfunction: Swelling can deform housings or push displays and connectors out of alignment.
Safety Hazard: Severe cases may lead to venting, leakage, or fire if abused.



Prevention Methods


Robust BMS: Over/under‑voltage, over‑current, temp protection, and active/passive balancing.
Thermal Management: Keep within spec (typ. -20℃~60℃ operation; custom designs available for wider range). Avoid charging below 0℃ without low‑temp strategy.
Quality Cells & Matching: Work with qualified manufacturers (e.g., Huawen New Power). Tight binning on capacity/IR and pack‑level validation.
Correct Charging: Certified chargers; avoid long‑term 100% SoC or 0% SoC storage; follow CC‑CV profile.
Routine Inspection: Visual checks, pack telemetry (SoC/SoH), and scheduled replacement for critical systems.




Cause vs. Prevention Table



Cause
Effect
Prevention




Overcharging
Gas generation, rising pressure
BMS high‑voltage cutoff, certified chargers


High Temperature
Electrolyte decomposition
Heat spreading/ventilation, avoid >60℃


Cell Mismatch
Imbalance, weak‑cell stress
Professional matching, strict QC


Mechanical Damage
Local short/overheating
Robust housing, careful handling


Overdischarge
Copper dissolution, internal shorts
BMS low‑voltage cutoff, storage at 30–60% SoC



For storage over 3 months, keep packs at ~30–60% SoC in a cool, dry place and cycle every 3–6 months.



Quick Visual Guide (Inline Icons)

Swelling
BMS
Temp
Charger



Work with Huawen New Power
We design and manufacture safe, high‑reliability lithium battery packs with advanced BMS, rigorous cell matching, and comprehensive testing. If you are experiencing swelling issues or need a custom pack, our engineering team can help diagnose and prevent recurrence.

Contact: sales@huawennewpower.com | Website: www.huawennewpower.com


© 2025 Huawen New Power. All rights reserved.

What Causes Lithium Plating and How to Prevent It
Lithium plating is one of the most serious degradation mechanisms in lithium-ion batteries. It occurs when metallic lithium deposits on the anode surface instead of being safely intercalated into the graphite layers. Over time, this reduces capacity, increases internal resistance, and creates dangerous conditions that may lead to thermal runaway. Understanding the causes—and how to prevent lithium plating—is essential for maintaining battery performance and safety.

What Is Lithium Plating?
During charging, lithium ions move from the cathode to the anode. Ideally, the ions intercalate smoothly into the graphite anode. Lithium plating happens when this process is disrupted, and metallic lithium deposits on the anode surface instead. Once plating begins, the deposited lithium may form dendrites, which can grow and puncture the separator, creating short‑circuit risks.

Key Risks of Lithium Plating:

Permanent capacity loss
Increased internal resistance
Dendrite formation and potential short circuits
Thermal runaway risk


Main Causes of Lithium Plating
The following table summarizes the key factors contributing to lithium plating:




Cause
Description
Risk Level




Low-temperature charging
Graphite slows absorption of lithium ions at low temperatures, causing excess ions to plate.
High


Fast charging
High charging current pushes lithium ions faster than the anode can absorb.
High


Overcharging / poor CV control
Excessive voltage speeds reactions at the anode, making plating more likely.
High


High anode SOC state
When the anode is nearly full, there is insufficient space for lithium intercalation.
Medium


Degraded SEI layer
A damaged SEI layer increases resistance and disrupts orderly ion flow.
Medium



How to Prevent Lithium Plating
Prevention depends on proper charging control, temperature management, BMS design, and battery material selection. Below are effective methods:

1. Temperature Control

Avoid charging lithium-ion batteries below 0°C.
Use pre-heating systems in EVs, power systems, and outdoor battery packs.
Integrate thermal management (air cooling or liquid cooling) where appropriate.

2. Optimized Charging Protocols

Use lower charging currents at low temperature.
Balance CC–CV charging to protect the graphite anode.
Avoid prolonged high-voltage charging (e.g., >4.20V for most chemistries).

3. Battery Management System (BMS) Protections
A well-designed BMS greatly reduces plating risk. Effective strategies include:


Low-temperature charge cut-off
Adaptive charging current control
Internal resistance monitoring
Cell balancing to prevent overcharging

4. Material and Design Considerations

Use graphite with higher diffusion rates to reduce ion congestion.
Apply stable SEI-forming additives (FEC, VC, LiFSI).
Use advanced anodes (graphite–silicon blends) for improved performance.

Checklist: Signs of Possible Lithium Plating



Indicator
Meaning




Sudden capacity drop
Inactive lithium loss


Increased internal resistance
Blocked ion pathways


Unusual temperature rise during charging
Poor intercalation efficiency


Voltage overshoot
Graphite saturation or SEI instability



Conclusion
Lithium plating is a major factor affecting battery safety, life cycle, and performance. By controlling temperature, optimizing charging parameters, improving anode materials, and utilizing a well-engineered BMS, lithium plating can be significantly minimized. For custom lithium battery solutions designed with advanced protection and optimized charging efficiency, Huawen New Power provides engineering-grade guidance and manufacturing expertise.




What Causes Lithium Plating and How to Prevent It
A technical explanation of why lithium plating happens in Li-ion batteries — and proven strategies to avoid it for longer cycle life and safer operation.

Introduction
Lithium plating occurs when metallic lithium deposits on the anode during charging instead of being intercalated into the graphite structure. This phenomenon is one of the most critical aging and safety concerns in lithium-ion batteries because it reduces capacity, increases internal resistance, and may cause internal short circuits. Understanding the causes and prevention techniques can significantly improve battery reliability and lifetime.

Main Causes of Lithium Plating



Cause
Description
Impact


Low-temperature charging
Graphite diffusion slows drastically at low temperatures.
Lithium deposits on surface instead of intercalating.


High charging current (fast charging)
Charge rate exceeds anode diffusion capability.
Metallic lithium buildup, SEI damage.


Overcharging or improper charging profile
Excessive potential drives lithium deposition.
Accelerated degradation and safety risks.


Anode aging or high impedance
Worn SEI or high resistance slows diffusion.
Higher risk under normal operating currents.


Excessive graphite lithiation
Occurs when anode is fully lithiated near 100% SOC.
Cannot accept more lithium, causing plating.



How Lithium Plating Happens: A Quick Visualization


Diffusion-limited Intercalation
At low temperatures or high currents, lithium ions cannot diffuse into graphite fast enough.



Metallic Lithium Deposition
Excess lithium accumulates on the anode surface as metallic deposits.



SEI Layer Stress
Deposits damage the SEI layer, causing thicker SEI and higher impedance.



Dendrite Growth Risk
If plating continues, dendrites may form and increase short-circuit risk.



Warning Signs of Lithium Plating

Sudden rise in internal resistance (IR)
Reduced usable capacity after fast charging
Unusual heat generation during charging
Voltage plateau anomalies visible during analysis
Shift in charge/discharge curves over cycles

Critical: Lithium plating is often irreversible. Early detection and preventive charging strategies are essential for long-term battery health.
How to Prevent Lithium Plating

Avoid charging at low temperatures. Charge above 10–15°C whenever possible.
Use controlled charging profiles. Implement CC/CV curves appropriate for the cell chemistry.
Reduce charge current at high SOC. Especially above 80% SOC.
Implement smart BMS protections. Limit current when temperature or impedance is high.
Ensure healthy SEI formation. Proper formation cycles improve long-term performance.
Use cells with optimized anode materials. Improved graphite or silicon‑graphite blends reduce plating tendency.

Sample Prevention Strategy (Engineering Workflow)



Step
Action
Purpose


1. Charging temperature control
Restrict fast charging below 15°C
Prevents diffusion-limited plating


2. Adaptive charging currents
Lower current when SOC > 80%
Reduces risk at high lithiation levels


3. Real-time impedance monitoring
BMS slows charge when IR rises
Detects early plating conditions


4. Balanced cell design
Optimize anode capacity ratio
Ensures safe charge acceptance



Conclusion
Lithium plating is one of the most significant challenges in ensuring safe and long-lasting lithium-ion battery operation. By understanding its causes and implementing strong prevention strategies — temperature control, optimized charging profiles, and intelligent BMS — manufacturers and users can greatly extend battery lifespan.


Article by Huawen New Power. For battery engineering support or custom pack solutions, contact our technical team.