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INDUSTRY CLUSTER · Electronics

Yiyang Heshan aluminum electrolytic capacitors

Heshan’s aluminum electrolytic capacitor chain spans foil treatment, paper and electrolyte through winding, sealing, ageing and reliability testing. Rated life only has meaning alongside temperature, ripple current and test conditions.

Formation and regional foundations

Close proximity among material, component, equipment and finished-product firms in Longling supports both sample validation and volume scheduling, while the testing centre and digital upgrades add lot data to coordination.

Heshan’s aluminum electrolytic capacitor network covers etched and formed foil, paper, electrolyte, leads, cases, winding, sealing and ageing. Rated capacitance is only the start; temperature, ripple, frequency, life definition and failure analysis reconnect materials to the finished part.

Core geography: Longling and nearby Heshan suppliers of etched and formed foil, electrolyte, lead wires and finished capacitors

The lot chain of a capacitor

How foil, electrolyte, winding and ageing records align

Links show handovers of quality records, not fixed supplier relationships.

  • Etched and formed foil — Capacitance, oxide film and foil lot enter the design.
  • Winding and impregnation — Tension, paper and electrolyte form the element.
  • Assembly and sealing — Leads, bung and case govern the seal.
  • Ageing and screening — Leakage and abnormal heating appear in the curve.
  • Application validation — Ripple, ambient temperature and mounting set actual stress.

01 · Five kilometres in Longling is not the whole answer

Local proximity shortens communication, while each material keeps its own quality responsibility.

Yiyang’s 2025 account describes a dense Longling network where major materials can be sourced within an hour. By September 2025 it recorded 102 chain firms, including 72 above-scale manufacturers.

Proximity can accelerate investigation but cannot remove lot differences among foil, electrolyte, paper, leads and bungs. The local supply circle is a communication condition, not a substitute for quality control.

Plan visits in three segments—materials, winding and sealing, then ageing and testing—and carry one target part number through all three. Each owner then answers for the same capacitor instead of presenting unrelated catalogues.

  • Supplier proximity must become an exception-response path

02 · Anode foil defines the charge space first

Etch geometry and formed oxide set capacitance, voltage and defect sensitivity.

The documented Heshan chain runs from etched and formed foil to finished capacitors. Foil is not ordinary sheet; its surface structure and oxide film must match rated voltage and design margin.

Higher foil capacitance may reduce size, but etch uniformity, mechanical strength and oxide defects affect winding and long-term leakage. One capacitance figure does not establish miniaturisation capability.

During sampling, retain foil coil, forming lot, thickness, capacitance and tensile condition and carry them into the element lot. Failure analysis can then return to the exact material batch.

  • The foil coil must enter element traceability

03 · Electrolyte conducts and ages with the device

Water, formulation and impregnation alter low-temperature behaviour, leakage and life.

The documented chain includes electrolyte, paper and related inputs, showing that Heshan has material coordination as well as finished-device production. A specific formulation remains a company- and part-level fact.

Higher electrolyte conductivity can improve equivalent series resistance, but temperature stability, corrosion, seal compatibility and storage change must also be observed. One room-temperature measurement cannot replace a life sequence.

Link electrolyte lot, paper lot, impregnation settings, element mass and sealing time in the pilot record. If fill varies, pause before increasing volume.

  • Formula identity must stay with impregnation results

04 · Winding tension leaves geometric consequences

Element shift, burrs and interlayer pressure appear downstream.

Heshan’s digital upgrades cover planning, workshop data and key processes, with some public cases reporting changes in lead time and efficiency. The regional adoption rate is not evidence of precision on every winding line.

Excess tension can damage foil and paper, while low tension can loosen the element and shift layers. Machine speed matters only with tension curves, burr control and element dimensions.

Sample elements from different time windows, compare mass, diameter, end face and short-circuit screening, and trace them to machine and shift. Do not rely on one attractive start-up sample.

  • Winding speed needs tension and dimensional results

05 · Sealing decides whether moisture stays outside

Leads, bung, case and crimp form one sealing system.

Hunan industry material names local lead-wire support, while the Yiyang account includes cases and final assembly in the supply circle. Each component supplier still needs matching to the target case size.

A sealing leak can originate in bung material, lead construction, case-mouth dimensions, crimp force or contamination. Good appearance does not exclude slow mass loss, so material and machine settings need one test programme.

At approval, fix case size, bung formulation identity, lead lot, crimp dimensions and leak or storage criteria. Repeat the relevant reliability work after any critical-component change.

  • The sealing system cannot be treated as unrelated parts

06 · The ageing curve is the first pre-shipment case history

Leakage, capacitance and heating anomalies must remain in equipment and lot records.

Heshan has built a provincial capacitor quality centre with documented testing, standards and technical-service functions. The platform provides local access but does not replace a manufacturer’s own lot release.

Ageing both reforms the oxide and exposes some assembly defects. A pass rate without voltage, time, temperature, limits and rejection distribution cannot show screening severity.

Inspect raw ageing curves from one lot and return abnormal parts for sectioning. If equipment logs, lot identity and failure location cannot align, repair traceability before discussing stable supply.

  • Look beyond pass rate to the distribution of exceptions

07 · Place three firms on distinct evidence layers

Aihua, Anxing and Sunshine provide entity entry points and do not prove one another.

Government sources name Hunan Aihua Group, Yiyang City Anxing Electronics and Yiyang Sunshine Electronic Technology in the Heshan capacitor context. Each firm still needs its own evidence for products and manufacturing sites.

A listed-group disclosure, park account and company list answer different questions. Group scale cannot be assigned to one Heshan factory, and being named by a park does not establish a part number.

For each approach, confirm legal entity, plant address, target series, specification version and recent lot evidence. If quoting and manufacturing entities differ, define quality and after-sales responsibility first.

  • Each company relationship needs its own evidence loop

08 · Translate rated life into customer duty

Temperature, ripple and heat removal rewrite the interpretation of rated life.

Heshan capacitors are expanding into ordinary civilian applications such as industrial controls, transport and new energy, while public sources emphasise reliability testing. An application direction does not prove fit for a particular part number.

The same rated life can produce very different service results under different hot spots, ripple frequencies, airflow, mounting and power cycles. Selection needs actual temperature rise, not one ambient-temperature figure.

Give the supplier voltage waveform, ripple spectrum, hot-spot temperature, space limit and life target, then run prototype heating and endurance work. Recalculate capacitor stress after a power-topology change.

  • Data-sheet life must be translated through duty conditions

Sources and reading notes

Cluster scale uses dated Heshan figures; firm count, above-scale firms, capacity and market share are not combined across years. Device performance is compared only under matched voltage, case size, temperature and test conditions.

  • Heshan reported RMB 23.26 billion in cluster output for 2024.
  • By September 2025, the cluster reported 102 chain firms, including 72 above-scale manufacturers.
  • The 2024 account records annual capacity above 50 billion units.
  • By September 2025, 72 firms in the cluster met the above-scale reporting threshold.

Related companies

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Sources

Use the original publishers to check dates, scope and definitions; public material is not a transaction guarantee.