TOPCon Cell Interconnection Patent Snapshot 2026
The TOPCon cell interconnection patent space is nascent and highly concentrated: eight patent families are split among five filers, with SOLARCA LLC holding the largest single position. Meaningful filing activity only emerged in 2022, signalling an early-stage field where foundational positions are still being staked.
SOLARCA LLC leads a five-player field with extreme concentration
SOLARCA LLC ranks first with 3 patent families, followed by HENGDIAN GRP DMEGC MAGNETICS CO LTD with 2, while Maxeon Solar, CHINT New Energy, and Solaria Corporation each hold 1. The top five filers together account for 100% of the ranked applicants visible in this query’ combined total, leaving no meaningful long-tail presence.
The tier gap between the leader and the rest of the field is narrow in absolute terms — a difference of one to two families — but given the total corpus size of 8 patent families, even single-family positions represent material stakes. No second tier has yet formed.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | SOLARCA LLC | 3 | |
| 2 | HENGDIAN GRP DMEGC MAGNETICS CO LTD | 2 | |
| 3 | Maxeon Solar Pte Ltd | 1 | |
| 4 | CHINT New Energy Technology Co Ltd | 1 | |
| 5 | Solaria Corporation | 1 |
SOLARCA LLC’s lead suggests it was the first mover in formalising interconnection-specific claims for TOPCon architectures. The presence of both a Chinese manufacturer (HENGDIAN GRP DMEGC MAGNETICS CO LTD) and internationally oriented players (Maxeon Solar, CHINT New Energy, Solaria Corporation) indicates early competitive diversity, but the field remains open for new entrants.
Filing records from approximately the last 18–24 months should be treated as under-counted due to standard patent publication delays; the 2024–2026 zeroes reflect lag, not a cessation of activity. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity emerged sharply in 2022 and remains concentrated in a single IPC class
The annual filing trend and technology composition charts together describe a field that activated quickly and is, to date, technologically homogeneous.
Annual filing trend
Zero filings are recorded from 2017 through 2021; 4 patent families appear in both 2022 and 2023, totalling the full corpus of 8. The 2024–2026 entries show zero, which reflects publication lag rather than a genuine halt. The 2022 inflection coincides with broader industry scaling of TOPCon cell production.
↗ Hover for values · click a bar to ask EurekaTechnology composition
All 8 patent families are classified under H01L (Semiconductor devices), specifically H01L 31, which covers photovoltaic devices. The absence of co-classification under other IPC branches — such as manufacturing process, module assembly, or electrical connection classes — indicates that claims are currently framed narrowly around the device level rather than broader system or process perspectives.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
IBC-BATTERIE UND HERSTELLUNGSVERFAHREN DAFÜR
Disclosed are an IBC cell and a preparation method therefor. The preparation method comprises the following steps: (1) subjecting a raw silicon wafer to a texturing treatment, coating a protective layer, and subjecting the protective layer to an etching modification treatment; (2) subjecting the modified silicon wafer to a polishing treatment, and… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | 一种太阳能电池的去绕镀方法及应用 | 4 |
| 2 | Interconnection configuration for solar module ass… | 1 |
| 3 | Interconnection configuration for solar module ass… | 1 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
Assignee snapshot from the current evidence set
The applicants below are visible in this query result. Because the evidence set is relatively small, read this section as a directional snapshot rather than a full competitive ranking.
SOLARCA LLC
SOLARCA LLC holds 3 patent families — the largest position in the corpus — all classified under H01L 31. Its momentum is flagged as a new entrant with 3 recent-period families and no prior baseline, indicating the company established its position entirely within the 2022–2023 activity window. Its European filing emphasis aligns with the EPO-visible jurisdiction pattern.
families: 3HENGDIAN GRP DMEGC MAGNETICS CO LTD
HENGDIAN GRP DMEGC MAGNETICS CO LTD holds 2 patent families, also concentrated in H01L 31, and is likewise classified as a new entrant with 2 recent-period families. As a large Chinese magnetics and electronics manufacturer, its presence signals that module-level interconnection IP is being pursued by vertically integrated component suppliers, not only dedicated solar companies.
families: 2Frequently asked questions
The corpus contains 8 patent families. Filing activity began in 2022, making this a nascent area with no patent history prior to that year.
SOLARCA LLC leads with 3 patent families. HENGDIAN GRP DMEGC MAGNETICS CO LTD follows with 2, and Maxeon Solar, CHINT New Energy Technology, and Solaria Corporation each hold 1.
Europe (EPO) leads with 4 patent records. China, India, the United States, and WIPO (PCT) each have 1 record.
The 2024–2026 filing counts show zero, but this reflects standard patent publication delays of 18–24 months rather than a genuine halt. The 2022–2023 activity window produced all 8 families and the field should be considered actively developing.
No co-applicant filings are present in the corpus. All five filers have acted independently, and no joint-development IP has been identified in this specific area.
Adjacent IPC classes such as H05K (electrical interconnection and printed circuit techniques) and H02S (solar energy generation systems at the module level) are not represented in the current corpus. These are observationally sparse areas that a new entrant with relevant process or system expertise could explore without direct conflict with existing families.
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Disclaimer. This page is generated from PatSnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
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