How Traditional Combustion Engine Parts Suppliers Can Pivot to Seize the Opportunities of Solid-State Batteries

Author:James Whitfield | Last updated: April 23, 2026 | Reading time: ~12 minutes

Core Message:

The window for mass production of solid-state batteries is opening. Toyota, Geely, Chery, and others have set their sights on 2026-2027 as the critical period for low-volume production and vehicle validation. For component companies that have spent decades in the traditional combustion engine supply chain, this is not just a technical upgrade—it is a strategic fight for survival. Those who actively embed themselves in the new supply chain will gain the upper hand in the next cycle of automotive technology.

I. Reading the Landscape: Solid-State Battery Industrialization is Accelerating

Solid-state batteries are no longer just a concept in the lab.

Toyota plans to begin small-scale trial production in 2026 and vehicle installation in 2027. Its sulfide-based electrolyte route aims for an energy density of 450-500 Wh/kg, roughly double that of current liquid lithium-ion batteries (source: Toyota Motor Corporation, solid-state battery investor briefing, October 2023; reiterated at Toyota Technology Briefing, November 2025).

In China, Geely plans to debut a prototype vehicle in 2026 and reach small-scale industrialization by 2027 with a fleet of 1,000 demonstration vehicles (source: Geely Auto Group, "Smart Geely 2025" strategy announcement, September 2023; updated timeline confirmed at Geely Auto China 2026 press conference, April 2026).

Chery plans to complete a pilot production line for 60Ah cells in 2026 and start vehicle demonstrations in 2027 (source: Chery Holdings, solid-state battery strategy briefing reported by Gasgoo, March 2025).

In the U.S. market, QuantumScape—backed by Volkswagen—officially launched its highly automated "Eagle Line" pilot facility in San Jose, California, in February 2026 (source: QuantumScape Corporation press release, "QuantumScape Inaugurates Eagle Line for Solid-State Battery Pilot Production," February 10, 2026). This marks a key step in moving its solid-state lithium-metal technology from the lab toward scalable manufacturing.

According to patent analysis firm KnowMade, over 1,660 new patent applications related to solid-state batteries were published globally in the fourth quarter of 2025 alone (source: KnowMade, Q4 2025 Solid-State Batteries Patent Landscape Report, published January 2026).

Toyota, Samsung SDI, LG Energy Solution, and Panasonic continue to strengthen their patent positions.

Market research from Research and Markets indicates that the global solid-state battery market is projected to grow from $1.6 billion in 2026 to $6.24 billion by 2030, a compound annual growth rate of 40.6% (source: Research and Markets, Solid State Battery Market Report 2026, Report Code: 5939403).

These numbers send a clear signal: the solid-state battery supply chain is taking shape. Traditional parts suppliers have a limited window—perhaps two to three years—to evaluate their options and make their move.

II. The Core Question: What is Shrinking? What is Growing?

According to a March 2026 report from Boston Consulting Group, the automotive supplier industry is experiencing a stark profit divide. Battery and semiconductor suppliers are enjoying double-digit growth, while traditional component manufacturers are seeing only single-digit gains (source: Boston Consulting Group, Automotive Supplier Profitability Report, March 2026, cited in Automotive News, March 9, 2026).

This gap is reshaping the entire supplier landscape. By 2035, demand for internal combustion engine powertrain parts—engine blocks, pistons, fuel pumps, exhaust systems—is expected to decline at an annual rate of about 8% (source: BCG report, March 2026). That decline is irreversible.

But challenge also means opportunity. The manufacturing process for solid-state batteries differs significantly from that of liquid batteries. It introduces entirely new steps like dry electrode coating, isostatic pressing, and high-voltage formation.

Meanwhile, the three main technical routes for solid electrolytes—sulfide, oxide, and polymer—each require entirely new material supply systems.

These shifts are creating growth in three key areas: manufacturing equipment, advanced materials, and system integration.

III. A Roadmap for Transition: Three Viable Paths

Path 1: Transfer Core Skills into the Solid-State Equipment Sector

For companies with deep expertise in precision machining and automated assembly, moving into equipment supply is the most direct path.

The dry electrode process for solid-state batteries demands extremely high mechanical precision and process stability. That is exactly where precision manufacturing experts shine.

U.S.-based Solid Power has chosen a capital-light approach, aiming to commercialize its technology through licensing rather than building massive cell factories on its own (source: Solid Power, Inc., business model overview, 2025 annual report filed with the SEC, February 2026). This model offers a valuable lesson for small and medium-sized traditional suppliers: you do not need to become a battery maker yourself. Instead, you can provide the critical equipment, components, or technical services that enable manufacturing.

Path 2: Move Upstream into Critical Materials Supply

The example of Shanghai Energy (formerly a leading separator manufacturer) is instructive. Facing the threat that all-solid-state batteries might eliminate traditional separators, the company moved upstream.

Its subsidiary has now built a pilot line capable of producing high-purity lithium sulfide and a line for sulfide-based solid electrolyte, and it is already positioned to supply these materials (source: Shanghai Energy New Materials Technology Co., annual report and investor presentation, 2025).

This shows that companies with expertise in materials engineering and chemical processing can start by entering auxiliary segments of the supply chain and then gradually move into core materials.

Path 3: Upgrade from "Parts Maker" to "System Integrator"

This path offers the biggest jump in value but also the greatest challenge.

Consider the case of Pengling, a company that originally made automotive fluid hoses. It transformed itself from a simple "tube seller" into a provider of complex thermal management assemblies that integrate sensors and precision connectors.

In July 2025, its new energy thermal management project went into production in Taizhou, Jiangsu, with a total investment of 600 million yuan, supplying major automakers like BYD, Geely, and NIO (source: Pengling Co., Ltd., Shenzhen Stock Exchange announcement, "Completion and Commissioning of New Energy Thermal Management Project," July 2025).

Faced with the rise of solid-state batteries, traditional suppliers can look at thermal management systems for battery packs, structural component assemblies, and packaging integration. The goal is to move from supplying a single piece of metal or plastic to delivering a complete, functional solution.

IV. Pitfalls to Avoid: Three Misconceptions to Watch For

Misconception 1: "Solid-state batteries are here tomorrow. We must go all-in right now."

Industry consensus suggests that while small-scale vehicle integration may start around 2027, true mass-market volume will not arrive until after 2030. Research and Markets projects the market reaching $6.24 billion by 2030—meaningful, but still a fraction of the broader EV battery market (source: Research and Markets report, 2026).

In the meantime, semi-solid batteries will serve as an important bridging technology for many years. Companies need a phased transition plan. Overinvesting too early carries real risk.

Misconception 2: "If we just decide to pivot, we will succeed. Our skills transfer easily."

Solid-state batteries sit at the intersection of materials science, electrochemistry, and precision manufacturing. The technical barriers are higher than those for traditional mechanical parts.

QuantumScape spent more than a decade, conducted over 2 million tests, filed more than 200 patents, and invested over $1.5 billion just to reach its current pilot production stage (source: QuantumScape Corporation, 2025 annual report and SEC filings; Eagle Line launch press release, February 2026).

Companies must honestly assess the gap between their current capabilities and what is required, and be prepared to close that gap through technology partnerships or targeted acquisitions.

Misconception 3: "Technology is everything. Customer relationships can wait."

Qualifying as a supplier in the automotive industry typically takes two to three years. The requirements in the emerging solid-state battery field may be even stricter. Establishing early communication with battery cell manufacturers and research institutes, and participating in sample testing and joint development, is critical to success.

V. Actionable Advice: A Three-Step Process Starting Today

Step 1: Capability Audit.

Take stock of your existing technical skills, equipment assets, and talent pool. Identify where your core strengths overlap with potential niches in the solid-state battery supply chain. Aim to complete a systematic assessment within one to two months.

Step 2: Start Small, Move Fast.

Begin with a minimum viable product. Provide a custom component or a small batch of samples for a pilot production line. Validate both technical feasibility and market interest before committing major capital.

Step 3: Build Connections.

Actively reach out to leading companies, research institutions, and industry associations in the solid-state battery ecosystem. Attend industry conferences and technical workshops. Aim to get on the radar of major manufacturers and become part of their supplier development process.

FAQ

Q1: When will solid-state batteries actually become mainstream?

According to current industry expectations, all-solid-state batteries will appear in small volumes in premium vehicles around 2027. Mass-market scale is expected around 2030. Until then, semi-solid batteries will be the dominant transitional technology (source: Toyota investor briefing, 2023; Research and Markets forecast, 2026).

Q2: How severe is the threat to traditional combustion engine parts suppliers?

For companies that rely entirely on engine and transmission components, the impact is severe and irreversible. Demand for ICE powertrain parts is expected to decline at roughly 8% annually through 2035 (source: BCG report, March 2026). However, companies with transferable skills in precision manufacturing, materials engineering, or automation have a real opportunity to pivot into the new supply chain.

Q3: Is it too late to start thinking about this now?

No, but you cannot afford to wait any longer. The industry is in a critical window of transition from semi-solid to all-solid-state technology. The next two to three years represent a golden period for strategic positioning. Once the supply chain structure is locked in, the cost and difficulty of entering will rise significantly.

References

[1] KnowMade. (2026, January). Q4 2025 Solid-State Batteries Patent Landscape. https://www.knowmade.com

[2] Research and Markets. (2026). Solid State Battery Market Report 2026 (Report Code: 5939403). https://www.researchandmarkets.com

[3] Boston Consulting Group. (2026, March). Automotive Supplier Profitability Report, cited in Automotive News, March 9, 2026. https://www.autonews.com

[4] QuantumScape Corporation. (2026, February 10). QuantumScape Inaugurates Eagle Line for Solid-State Battery Pilot Production [Press release].

[5] Solid Power, Inc. (2026, February). 2025 Annual Report, filed with the U.S. Securities and Exchange Commission.

[6] Toyota Motor Corporation. (2023, October). Solid-state battery investor briefing.

[7] Geely Auto Group. (2023, September). Smart Geely 2025 strategy announcement; updated timeline at Geely Auto China 2026 press conference, April 2026.

[8] Chery Holdings. (2025, March). Solid-state battery strategy briefing, reported by Gasgoo.

[9] Pengling Co., Ltd. (2025, July). Shenzhen Stock Exchange announcement: Completion and Commissioning of New Energy Thermal Management Project.

[10] Shanghai Energy New Materials Technology Co. (2025). Annual report and investor presentation.

About the Author

James Whitfield is a Michigan-based manufacturing engineer and automotive industry analyst. He spent 12 years with a major Tier-1 powertrain supplier, working on production line optimization and supplier development. He now advises component manufacturers on navigating the transition from internal combustion to electric vehicle architectures. His focus areas include manufacturing process adaptation and emerging battery supply chain dynamics. He holds a B.S. in Mechanical Engineering from Kettering University.

Disclaimer

The industry data, corporate developments, and technology forecasts cited in this article are derived from publicly available market information and research reports as of April 2026. The industrialization of solid-state batteries is subject to changes in technology roadmaps, supply chain readiness, and regulatory policy. Actual outcomes may vary. This content is for informational and strategic discussion purposes only and does not constitute investment advice or a business decision-making directive. Mention of specific company names or case studies is for illustrative analysis only and does not imply endorsement. Readers should consult with professional advisors before making business decisions. The author and publisher assume no responsibility for actions taken based on the information provided herein.

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