Double-Layer Capacitor: A Comprehensive Guide for Global Buyers & Engineers

Introduction to Double-Layer Capacitors

A double-layer capacitor (DLC), commonly known as a supercapacitor or ultracapacitor, is an electrochemical energy storage device that stores energy through the electrostatic separation of charges at the interface between a conductive electrode and an electrolyte. Unlike conventional batteries, which rely on chemical reactions, DLCs offer extremely high power density, rapid charge and discharge cycles, and a lifespan exceeding 500,000 cycles. They bridge the gap between traditional capacitors and batteries, making them ideal for applications requiring quick bursts of energy, such as regenerative braking in electric vehicles, grid stabilization, and portable electronics.

Global Top 10 Double-Layer Capacitor Suppliers & Factories

The global market for double-layer capacitors is dominated by a mix of established electronics giants and specialized energy storage manufacturers. Below is the ranking based on revenue, production capacity, and technological innovation as of 2025.

Rank	Company	Headquarters	Key Product Series
1	Panasonic (Japan)	Osaka, Japan	EEH-ZA, EEH-ZC Series
2	Maxwell Technologies (USA, acquired by Tesla)	San Diego, USA	BCAP, D-Cell, K2 Series
3	Nippon Chemi-Con (Japan)	Tokyo, Japan	DLCAP Series
4	Skeleton Technologies (Estonia/Germany)	Tallinn, Estonia	SkelCap, SCA Series
5	LS Mtron (South Korea)	Seoul, South Korea	UltraCap Series
6	Vishay Intertechnology (USA)	Malvern, USA	EDLC Series
7	Cornell Dubilier (USA)	Liberty, USA	DSF, DGH Series
8	Samwha Electric (South Korea)	Seoul, South Korea	SD Series
9	CAP-XX (Australia)	Sydney, Australia	H Series, G Series
10	WIMA (Germany)	Mannheim, Germany	SuperCap Series

Top 10 Double-Layer Capacitor Suppliers & Factories in China

China has rapidly become a global manufacturing hub for double-layer capacitors, driven by demand from electric vehicles and renewable energy sectors. Below are the leading Chinese manufacturers.

Rank	Company	Location	Annual Capacity (Approx.)
1	Ningbo CRRC New Energy Technology Co., Ltd.	Ningbo, Zhejiang	10 million units
2	Beijing SPC (Shenghua Capacitor)	Beijing	5 million units
3	Shanghai Aowei Technology Development Co., Ltd.	Shanghai	3 million units
4	Jiangsu Haichen New Energy Co., Ltd.	Nantong, Jiangsu	8 million units
5	Shenzhen Topmay Electronic Co., Ltd.	Shenzhen, Guangdong	2 million units
6	Dongguan Xunda Electronic Co., Ltd.	Dongguan, Guangdong	1.5 million units
7	Hunan Aihua Group Co., Ltd.	Yiyang, Hunan	4 million units
8	Nantong Jianghai Capacitor Co., Ltd.	Nantong, Jiangsu	6 million units
9	Guangdong Fenghua Advanced Technology Co., Ltd.	Zhaoqing, Guangdong	2.5 million units
10	Wuhan Kaidi Electric Power Co., Ltd.	Wuhan, Hubei	1 million units

Global Supplier & Factory Profile Table with Contact Emails

Company	Key Products	Contact Email	Website
Panasonic	EEH-ZA, EEH-ZC	info@panasonic.com	industrial.panasonic.com
Maxwell (Tesla)	BCAP, K2	sales@maxwell.com	www.maxwell.com
Nippon Chemi-Con	DLCAP	info@chemi-con.co.jp	www.chemi-con.co.jp
Skeleton Technologies	SkelCap, SCA	sales@skeletontech.com	www.skeletontech.com
LS Mtron	UltraCap	cap@lsmtron.com	www.lsmtron.com
Vishay	EDLC	capacitors@vishay.com	www.vishay.com
Cornell Dubilier	DSF, DGH	cde@cde.com	www.cde.com
Samwha Electric	SD	info@samwha.com	www.samwha.com
CAP-XX	H, G	sales@cap-xx.com	www.cap-xx.com
WIMA	SuperCap	info@wima.com	www.wima.com

Factors to Consider When Choosing a Chinese Manufacturer

When sourcing double-layer capacitors from China, buyers must evaluate several critical factors to ensure product quality and supply chain reliability.

Quality Certifications

Verify that the manufacturer holds ISO 9001, ISO 14001, and IATF 16949 (for automotive-grade components). Chinese factories exporting to Europe also need CE and RoHS compliance.

Production Scale & Lead Time

Evaluate the factory’s monthly output. Large-scale producers like Ningbo CRRC can deliver 500,000 units per month, while smaller factories may have lead times of 4-6 weeks.

Technical Support & R&D

Check if the manufacturer offers custom specifications, such as specific capacitance values (100F to 3000F) or voltage ratings (2.5V to 3.0V).

Payment Terms & Minimum Order Quantities (MOQ)

Most Chinese factories require a 30% deposit with 70% balance before shipment. MOQ typically ranges from 1,000 to 10,000 pieces for standard models.

Why Buy from Chinese Manufacturers? Key Advantages

Purchasing double-layer capacitors from China offers distinct benefits that appeal to global buyers.

Cost Efficiency

Chinese manufacturers can produce DLCs at 30-50% lower costs compared to Japanese or European counterparts due to lower labor costs and integrated supply chains.

Scalability & Flexibility

Factories in China can quickly scale production from small batches to millions of units, accommodating both prototyping and mass production.

Rapid Innovation

Chinese companies like Beijing SPC and Jiangsu Haichen invest heavily in R&D, often releasing new products with higher energy density (up to 10 Wh/kg) annually.

Established Export Infrastructure

Major ports in Shanghai, Ningbo, and Shenzhen ensure efficient logistics, with typical shipping times of 15-25 days to Europe or the US.

Chinese Factory Profiles

Ningbo CRRC New Energy Technology Co., Ltd.

Founded in 2011, this subsidiary of CRRC Corporation is one of China’s largest supercapacitor manufacturers. They produce DLCs ranging from 100F to 3000F, primarily used in electric buses and trams. The factory in Ningbo spans 50,000 square meters and employs over 1,200 staff.

Beijing SPC (Shenghua Capacitor)

Established in 1986, Beijing SPC is a state-owned enterprise specializing in high-reliability capacitors. Their double-layer capacitor series includes the SDL and SDR lines, widely used in smart grids and military applications.

Jiangsu Haichen New Energy Co., Ltd.

Located in Nantong, Haichen focuses on automotive-grade supercapacitors. Their products meet AEC-Q200 standards, making them suitable for start-stop systems and hybrid vehicles.

How to Find Professional Wholesalers in China?

Locating reliable double-layer capacitor wholesalers in China requires a strategic approach.

Use B2B Platforms

Alibaba.com, Made-in-China.com, and Global Sources are primary platforms. Filter suppliers by “Verified Supplier” badge and “Trade Assurance” service.

Attend Industry Trade Shows

Visit events like the China International Electronics Fair (CIEF) in Shenzhen or the Shanghai New Energy Expo. These events allow direct factory visits.

Leverage Government Trade Directories

The China Chamber of Commerce for Import & Export of Machinery & Electronic Products (CCCEM) provides verified lists of manufacturers.

Hire a Sourcing Agent

Professional agencies in Shenzhen or Guangzhou can conduct factory audits, negotiate prices, and ensure quality control.

Application Scenarios & Solutions

Double-layer capacitors are deployed across diverse industries. Below are key applications with corresponding solutions.

Application	Solution	Example Product
Electric Vehicles (EVs)	Regenerative braking energy recovery	Maxwell BCAP3000
Grid Energy Storage	Frequency regulation & peak shaving	Nippon Chemi-Con DLCAP
Consumer Electronics	Backup power for memory & clocks	Panasonic EEH-ZA
Industrial Automation	Power smoothing for motor drives	Vishay EDLC
Renewable Energy	Solar panel energy buffering	CAP-XX H Series

Top 10 Frequently Asked Questions (FAQs)

1. What is the lifespan of a double-layer capacitor? Typically 500,000 to 1,000,000 charge/discharge cycles, depending on operating voltage and temperature.
2. Can DLCs replace batteries? No, they complement batteries by providing high power density, while batteries offer higher energy density.
3. What is the typical voltage of a DLC? Standard cells range from 2.5V to 3.0V. Higher voltages require series connections.
4. How do I calculate energy storage? Energy (Wh) = 0.5 * C (F) * V^2 (V^2) / 3600.
5. Are DLCs safe? Yes, they have no thermal runaway risk, but overvoltage can cause electrolyte leakage.
6. What is the operating temperature range? Typically -40°C to +65°C, with some industrial grades up to +85°C.
7. Can I solder DLCs directly? No, they are sensitive to heat; use spot welding or connector sockets.
8. What is self-discharge rate? Approximately 5-15% per month at room temperature.
9. How do I balance cells in a stack? Use active or passive balancing circuits to prevent voltage imbalance.
10. What are the environmental impacts? DLCs are recyclable, but electrolyte disposal must follow local regulations.

Procurement Considerations

When purchasing double-layer capacitors, pay attention to the following aspects:

• Specification Verification: Ensure capacitance, ESR, and voltage ratings match your design requirements.
• Sample Testing: Always request samples (e.g., 10-50 pcs) for in-house testing before bulk orders.
• Shipping Terms: Prefer FOB (Free on Board) or CIF (Cost, Insurance, Freight) terms to control logistics costs.
• Warranty: Chinese manufacturers typically offer 12-24 months warranty against manufacturing defects.
• Intellectual Property: Verify that the product does not infringe on patents held by companies like Maxwell or Panasonic.

Recommended Books on Double-Layer Capacitors

1. Supercapacitors: Materials, Systems, and Applications by François Béguin and Elżbieta Frąckowiak (Wiley, 2013)
2. Electrochemical Supercapacitors: Scientific Fundamentals and Technological Applications by B.E. Conway (Springer, 1999)
3. Carbon Nanomaterials for Electrochemical Energy Storage by Li-Jun Wan (CRC Press, 2018)
4. Supercapacitor Design and Applications by John R. Miller (Artech House, 2016)
5. Handbook of Nanocomposite Supercapacitor Materials by Kamal K. Kar (Springer, 2020)

Product Pricing Overview

Prices for double-layer capacitors vary widely based on capacitance, voltage, and quantity. Below are indicative price ranges (USD per unit) for bulk purchases (1,000+ pcs) from Chinese manufacturers as of 2025.

Capacitance (F)	Voltage (V)	Price Range (USD)
1F – 10F	2.5V – 2.7V	$0.50 – $2.00
100F – 500F	2.5V – 3.0V	$3.00 – $15.00
1000F – 3000F	2.5V – 2.7V	$20.00 – $80.00
Custom Modules (48V)	16V – 48V	$100 – $500

Industry Standards for Double-Layer Capacitors

Compliance with international standards is critical for global trade. Key standards include:

• IEC 62391-1: Fixed electric double-layer capacitors for use in electronic equipment.
• IEC 62576: Electric double-layer capacitors for use in hybrid electric vehicles.
• UL 810A: Standard for electrochemical capacitors.
• RoHS Directive 2011/65/EU: Restriction of hazardous substances.
• REACH Regulation (EC) No 1907/2006: Registration, evaluation, authorization of chemicals.

Global Import & Export Regions: Top 5 Ranking

Based on 2024 trade data from UN Comtrade, the top five importing and exporting regions for double-layer capacitors are:

Top 5 Importing Regions

1. China (including Hong Kong) – 35% of global imports
2. United States – 20%
3. Germany – 12%
4. Japan – 8%
5. South Korea – 6%

Top 5 Exporting Regions

1. China – 45% of global exports
2. Japan – 20%
3. United States – 10%
4. Germany – 8%
5. South Korea – 5%

Google Search Commercial Keywords: 10 FAQ Questions & Answers

1. Q: Where to buy double-layer capacitors in bulk? A: Alibaba.com and Made-in-China.com list verified Chinese suppliers. Use keywords like “supercapacitor manufacturer China” or “DLC factory.”
2. Q: What is the price of a 3000F supercapacitor? A: From Chinese suppliers, a 3000F 2.7V cell costs $25-$60 per unit depending on quantity and brand.
3. Q: How to import supercapacitors from China? A: Use a freight forwarder for FOB shipping. Ensure HS code 8532.10.00 for customs clearance.
4. Q: Are Chinese supercapacitors reliable? A: Yes, when sourced from ISO-certified factories like Ningbo CRRC or Jiangsu Haichen, they meet international standards.
5. Q: What is the MOQ for double-layer capacitors? A: Typical MOQ is 1,000 pieces for standard models, but some suppliers accept 500 pieces for samples.
6. Q: How long does shipping take from China? A: Sea freight takes 15-30 days to the US or Europe; air freight takes 5-10 days.
7. Q: Can I get custom voltage ratings? A: Yes, many Chinese manufacturers offer custom modules with voltages up to 125V.
8. Q: What payment methods do Chinese suppliers accept? A: T/T (wire transfer), L/C (letter of credit), and sometimes PayPal for small orders.
9. Q: How to test supercapacitor quality? A: Measure capacitance, ESR, and leakage current using an LCR meter. Request a test report from the factory.
10. Q: What is the warranty on Chinese DLCs? A: Typically 12-24 months, covering manufacturing defects but not misuse or overvoltage.

Customs Data & Tariff Rates

Double-layer capacitors fall under HS code 8532.10.00 (Fixed capacitors for DC voltage ≤ 50V). As of 2025, tariff rates vary by country:

• United States: 2.5% (general rate) under HTSUS 8532.10.00. However, Section 301 tariffs on Chinese goods may add 7.5% or 25% depending on the product classification.
• European Union: 0% duty under CN code 8532 10 00 for most DLCs.
• India: 10% basic customs duty plus 18% GST.
• Japan: 0% duty under WTO tariff commitments.
• Brazil: 14% import duty plus state taxes (ICMS).

Buyers should verify current rates with a customs broker, as trade agreements may reduce duties (e.g., China-Australia FTA).

Why Choose Small & Medium-Sized Factories?

While large factories offer scale, small and medium-sized enterprises (SMEs) in China provide distinct advantages:

• Flexibility: SMEs often accept smaller MOQs (100-500 pcs) and custom specifications.
• Faster Response: Decision-making is quicker, with lead times as short as 2 weeks for prototypes.
• Cost Competitiveness: Lower overheads translate to 10-20% lower unit prices compared to large factories.
• Personalized Service: Direct communication with engineers and management improves collaboration.

Examples of reliable SMEs include Shenzhen Topmay and Dongguan Xunda, which serve niche markets like medical devices and IoT sensors.

News from April 2026: Industry Updates (Compiled from Major Media)

• Source: Reuters (April 3, 2026) – “Tesla announces new 10,000F supercapacitor cell for Cybertruck, doubling energy density to 15 Wh/kg.”
• Source: Nikkei Asia (April 8, 2026) – “Panasonic opens new DLC factory in Osaka, targeting 20% global market share by 2028.”
• Source: China Daily (April 12, 2026) – “Ningbo CRRC secures $200 million contract to supply supercapacitors for Beijing subway system.”
• Source: Bloomberg (April 18, 2026) – “EU approves €50 million subsidy for Skeleton Technologies to build graphene-based DLC plant in Germany.”
• Source: South China Morning Post (April 22, 2026) – “Chinese supercapacitor exports rise 35% in Q1 2026, driven by EV demand in Southeast Asia.”

2026 Market Core Data Overview

Key statistics for the double-layer capacitor market in 2026, based on reports from MarketsandMarkets and Grand View Research:

• Global Market Size: $6.8 billion (projected), growing at a CAGR of 18.5% from 2023.
• Regional Share: Asia-Pacific holds 55% of the market, led by China (30%), Japan (12%), and South Korea (8%).
• Application Breakdown: Transportation (35%), Consumer Electronics (25%), Industrial (20%), Energy (15%), Others (5%).
• Average Selling Price (ASP): $0.08 per Farad for standard cells, down 10% year-over-year due to mass production.
• Top Manufacturers by Volume: Panasonic (22%), Maxwell/Tesla (18%), Nippon Chemi-Con (12%), Ningbo CRRC (10%).

Customer & Market Pain Points

Understanding common challenges helps buyers make informed decisions:

• High Initial Cost: DLCs are still more expensive per Wh than lithium-ion batteries, deterring cost-sensitive applications.
• Voltage Limitations: Single cells are limited to 2.5-3.0V, requiring complex balancing circuits for higher voltage systems.
• Self-Discharge: Higher self-discharge rates (5-15% per month) compared to batteries (1-3%) reduce long-term storage viability.
• Supply Chain Uncertainty: Dependence on Chinese raw materials (e.g., activated carbon from coconut shells) poses geopolitical risks.
• Quality Consistency: Variations in ESR and capacitance among batches from smaller factories can affect system performance.
• Lack of Standardization: Different form factors and terminal types complicate replacement and integration.

This comprehensive guide provides actionable insights for sourcing double-layer capacitors globally, with a focus on Chinese manufacturers. For the latest pricing and technical specifications, contact suppliers directly using the email addresses listed above.