Hybrid aluminium electrolytic capacitors: heat, ripple current and Chinese competition in automotive power

For automotive power designers assessing Chinese capacitor suppliers, a wider product offering is only the first step towards a broader qualified supply base. As the industry enters the fourth quarter of 2026, international manufacturers are extending voltage and temperature ratings, while Chinese companies invest in materials, equipment and capacity. Recent financial disclosures show that product upgrades, sales growth and margin improvement are progressing at different speeds. Material costs and customer qualification continue to shape the return on that investment.

Hybrid aluminium electrolytic capacitors combine conductive polymer with liquid electrolyte, providing filtering and short-term current buffering. This article focuses on low-voltage supply positions in electric water pumps and electric power steering, or EPS. Compared with the traction battery's high-voltage bus, these positions place particular demands on ripple capability, temperature rise and vibration within a compact enclosure. Supplier progress needs to be assessed against those operating conditions, alongside the economics of producing and qualifying the parts.

Automotive demand is upgrading, with uneven growth across applications and products

Recent manufacturer disclosures show automotive power-circuit development creating opportunities for higher-performance capacitors. They also show why one company's growth cannot be treated as a measure of the whole hybrid-capacitor market.

Nippon Chemi-Con's quarterly presentation published in August provides one example. For April–June 2026, sales to automotive-electronics applications increased from approximately JPY 10.1 billion a year earlier to JPY 11.2 billion. The rounded chart values imply growth of about 11%, compared with 23% growth in total company sales. Automotive business was expanding, but data-centre-related demand was providing a stronger contribution to overall sales growth.

Figure 1. Original Nippon Chemi-Con quarterly presentation, August 2026. Automotive electronics is an application category spanning multiple products, not hybrid-capacitor revenue alone. The reporting period is April–June 2026; it does not describe live fourth-quarter orders.

The company also noted weaker Chinese domestic demand affecting global automotive sales in the quarter, alongside growth in European xEV sales. Regional exposure, vehicle mix and customer programmes therefore still affect component orders. Electrification does not give every automotive project the same purchasing schedule.

Chinese suppliers also report different growth rates across product categories. Huaguan's first-half 2026 report showed liquid-electrolyte aluminium-capacitor revenue of approximately RMB 99.17 million, up 14.88%, and solid-electrolyte revenue of approximately RMB 18.69 million, up 59.05%. The company associated the latter increase with higher sales of mid- and high-end solid products. Hybrid devices were not reported as a separate category, so the figures cannot establish their individual growth rate.

In water pumps and EPS, demand for upgrades comes from practical operating requirements. Integrating the pump controller with the motor puts capacitors near heat and vibration. Rapid EPS load changes require the power circuit to support stable current delivery. Lower equivalent series resistance, or ESR, helps reduce ripple losses, while smaller components can leave room for the control board and thermal design. A higher headline rating creates value only when the full set of operating requirements is met.

The more useful market evidence is therefore qualification and repeat purchasing of high-temperature, high-ripple and compact parts. Total new-energy-vehicle production alone cannot determine hybrid-capacitor demand: low-voltage architectures, component counts and supplier allocations vary by vehicle, and new applications need to be distinguished from orders moving between existing suppliers.

Material costs constrain price increases and margin recovery

Stronger demand for high-end products does not guarantee that suppliers can pass through higher costs. Huajin Capital's investor-relations record of 27 May identified rising raw-material prices as a pressure on Huaguan, with electrode foil accounting for a substantial part of aluminium-electrolytic-capacitor cost. The discussion concerned the possibility of passing costs through while maintaining long-term relationships with key customers.

That is evidence of a cost-management challenge, not a confirmed general price rise in automotive hybrid capacitors. Contract terms, customer bargaining and supply arrangements influence repricing. Materials, labour, manufacturing and quality costs may also rise alongside selling prices. Without comparable transactions for the same parts over time, a single price-increase rate cannot describe the category.

Huaguan's half-year results illustrate the distinction. Revenue reached approximately RMB 118 million, up 20.15%, and net profit attributable to shareholders reached approximately RMB 13.26 million, up 35.70%. Yet company-wide gross margin edged down from 33.36% to 32.92%.

Figure 2. Huaguan's first-half 2026 disclosures. Revenue growth by reported product category and company-wide gross margin are shown separately. The solid-electrolyte category is not a pure hybrid-capacitor business, and these figures do not disclose profitability for any individual automotive customer.

The report attributed net-profit growth mainly to increased revenue and cost and expense control. Net operating cash inflow was approximately RMB 15.90 million, down 26.68% year on year. These company-wide figures cannot be assigned solely to hybrid capacitors. They show why product mix, operating expenses and cash collection need to be considered together when assessing a move towards higher-end products.

Jianghai and Aishi's company results through the third quarter likewise span multiple capacitor types and applications. Group growth does not reveal automotive hybrid-capacitor margins. During development and production ramp-up, samples, reliability testing, application support and equipment depreciation create costs before larger orders can spread those costs over more units.

First-half disclosures establish material-cost pressure and responses through product upgrades, management improvements and price negotiations. Whether those measures produce sustained category-level margin recovery in the fourth quarter still requires more detailed product revenue, pricing and cost evidence.

Chinese investment expands capacity before customer adoption establishes usable supply

Jianghai's half-year report describes continued improvements in etched-foil specific capacitance, gradual industrialisation of N-type conductive polymer materials, and technology upgrades and capacity expansion for next-generation aluminium capacitors including hybrid products. The investment connects materials, manufacturing and finished devices, aiming to turn improved electrical performance into repeatable production.

That coordination can support material supply, consistency and cost control. Materials industrialisation does not, by itself, establish volume adoption in an automotive programme. Revenue from water-pump or EPS products still needs evidence linking the relevant parts, qualification and actual deliveries.

Aishi's programme combines product development and project investment. Its half-year report identifies high-temperature, high-ripple, compact and long-life product upgrades for applications including automotive electronics. A September financing feasibility report includes hybrid aluminium electrolytic capacitors in a capacity-expansion project. Because the project also covers film, snap-in and other aluminium-electrolytic products, its entire funding or planned output cannot be attributed to automotive hybrids.

Huaguan is extending its existing surface-mount manufacturing base. Its May disclosure described liquid-electrolyte products as the main business, supplemented by solid and hybrid capacitors, with coverage including automotive electronics. Existing production experience and customer relationships can support evaluation of new products, but an established liquid-capacitor customer still needs to qualify a hybrid part for the relevant project.

The company's material-supply approach also differs from Jianghai's. Huaguan stated that it did not operate its own electrode-foil plant, maintained long-term supplier relationships, and had stable and sufficient foil supply at the time. Procurement cooperation and internal management are therefore important responses to cost changes. Rising material prices and material shortages are separate conditions; higher costs do not establish an interruption in supply.

At the same meeting, Huajin Capital cited an equipment-expansion cycle of approximately three to five months for the aluminium-electrolytic industry at that time. This was an equipment measure, not the full interval from construction to volume supply of automotive hybrid products. Process stability, pilot-production screening, reliability testing and customer acceptance can determine when additional equipment becomes qualified supply.

YMIN presents its portfolio more directly through application requirements. Its October water-pump material covered hybrid families including VHT, VHU and VHR, addressing different temperature, endurance and vibration conditions. It also continued to publish EPS application content. These materials help customers start matching specifications to an installation position, but are not themselves a disclosed volume-production record for a named vehicle programme.

Changzhou Huawei and Beryl are also part of the competitive landscape. Huawei's April disclosure on aluminium-capacitor automation upgrades addressed high-temperature capability, vibration-resistant design, ripple capability and consistency. Beryl lists hybrid products and disclosed third-party automotive-testing developments in July. The former is primarily manufacturing-upgrade evidence; the latter provides product and testing progress. Both need further mapping to individual series and customer status.

These suppliers are taking different routes to orders: integrated manufacturers are coordinating materials with scaled production, surface-mount specialists are extending products and customer coverage, and application-focused suppliers are detailing operating requirements. As capacity enters the market, qualification responsiveness, yield and cost will also influence competition. Where adoption lags factory investment, depreciation and research spending can precede revenue growth.

International product updates raise the requirements for comparable alternatives

TAIYO YUDEN announced the HVX(-K) and HTX(-K) series in July, stating that volume production had begun in June at its ELNA subsidiary's plant. Intended applications include power circuits for steering control and ADAS. The expanded offering includes 80 V products with an upper operating temperature of 135°C.

Figure 3. Manufacturer series photograph and example specification from TAIYO YUDEN's July 2026 announcement. The photograph depicts the product family, not a verified image of the example part number. The announcement does not provide the full frequency condition for its ripple-current value; comparison requires the corresponding specification sheet.

The update is relevant to 48 V supply applications. Even vehicles with an 800 V traction platform may power pumps, EPS and control circuits through a low-voltage network, depending on the vehicle design. As that network's voltage rises, capacitance, ripple capability and size remain important. Rated voltage must also be selected against maximum bus voltage, transient protection and derating conditions.

Panasonic expanded selected parts in its ZL, ZS and ZSU series in May, continuing to fill out combinations of capacitance and dimensions. Chinese suppliers therefore face a portfolio comparison as well as a single-part comparison: customers may need a range of specifications with consistent performance across production batches.

High-temperature devices present their own trade-offs. YMIN's October material lists VHT at 125°C and 4,000 hours, VHU at 135°C and 4,000 hours, and VHR at 150°C and 2,000 hours. Taiwan-based Lelon's 2026 catalogue lists HUE at 145°C and 2,000 hours and HUJ at 150°C and 1,000 hours. The families cover different capacitances, dimensions and allowable ripple currents. Temperature and endurance hours alone cannot rank manufacturers.

Figure 4. Original HUJ page from Lelon's 2026 catalogue. Endurance conditions include rated voltage and rated ripple current, followed by parameter checks after restoration to 20°C. Test hours cannot be converted directly into vehicle service life.

Nippon Chemi-Con's April HXF update also emphasises integrated automotive electromechanical applications. Its provision for short exposure to 150°C needs to be distinguished from a product intended for continuous operation at that temperature. Nichicon continued to exhibit automotive hybrid aluminium electrolytic products at a June automotive technology exhibition. International suppliers are expanding their coverage, making comparison under the same application conditions essential.

Customer adoption also depends on requirements beyond electrical performance. AEC-Q200 concerns stress testing of passive components; IATF 16949 concerns the quality-management system. Customers assess products and production processes under their own validation plans. Published test progress can support evaluation, while sustained supply also requires board-level validation, traceability and change-management records.

As of early November, the clearest market pattern is simultaneous product upgrading and supply expansion, with demand, pricing and profitability improving at different rates. Chinese suppliers' opportunities are becoming more specific to individual requirements and projects. The next commercial test is whether qualified products can sustain larger deliveries and whether the additional business can cover material, manufacturing and quality costs.

Prepared from public information for industry discussion. Product specifications, supply and qualification status remain subject to current manufacturer and customer information.