Ningde Amperex Technology Ltd v. Zhuhai CosMX Battery Co Ltd

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Ningde Amperex Technology Limited (China)
  • Defendant: Zhuhai CosMX Battery Co., Ltd. (China)
  • Plaintiff's Counsel: Quinn Emanuel Urquhart & Sullivan, LLP
• Case Identification: 1:25-cv-02272, E.D. Va., 02/10/2026
• Venue Allegations: Plaintiff alleges venue is proper because the defendant is not a U.S. resident and thus may be sued in any judicial district.
• Core Dispute: Plaintiff seeks a declaratory judgment of ownership, unenforceability, invalidity, and correction of inventorship for Defendant's U.S. patent, alleging the patented technology was derived from Plaintiff's misappropriated trade secrets.
• Technical Context: The dispute centers on the mechanical design and structure of lithium-ion "coin cell" batteries, which are critical components in compact consumer electronics like wireless earbuds and smartwatches.
• Key Procedural History: The complaint alleges a history of disputes, including a prior U.S. litigation where a jury found Defendant willfully infringed a different patent owned by Plaintiff. It also notes that Defendant has sued Plaintiff in China on Chinese counterpart patents, which Plaintiff alleges were also derived from its technology, creating the apprehension necessary for this declaratory judgment action.

Case Timeline

II. Technology and Patent(s)-in-Suit Analysis

U.S. Patent No. 12,107,286 - "Housing Assembly of Button Cell, Button Cell and Electronic Product"

• Patent Identification: U.S. Patent No. 12,107,286, "Housing Assembly of Button Cell, Button Cell and Electronic Product," issued October 1, 2024.

The Invention Explained

• Problem Addressed: The patent's background section notes that button cells in the prior art have poor sealability, leading to potential safety hazards like liquid leakage, which adversely affects quality and performance '286 Patent, col. 1:21-28 Specifically, prior art sealing methods that rely on butting upper and lower housings together require multiple sealing points, making them difficult to seal and creating a high risk of leakage '286 Patent, col. 5:40-46
• The Patented Solution: The invention proposes a housing assembly where a conductive part (like a "conductive nail") penetrates through a single through-hole in the battery housing and is then sealed and insulated '286 Patent, abstract This design simplifies the sealing process to a single location-the interface between the conductive part and the through-hole-which is intended to create a more robust seal and improve the battery's reliability and performance '286 Patent, col. 2:1-6 The structure is illustrated in figures such as FIG. 4, which shows a conductive nail (22a) passing through the housing (21) with a gasket (222) to ensure a tight seal '286 Patent, col. 10:60-65
• Technical Importance: This approach seeks to improve the fundamental reliability and safety of coin cell batteries, which is critical for their use in high-value, body-worn consumer electronics where leakage could damage the device or pose a risk to the user '286 Patent, col. 1:18-20

Key Claims at a Glance

• The complaint seeks a declaratory judgment on all claims of the '286 Patent and specifically highlights technology related to claim 7 Compl. ¶63 Compl. ¶73 The primary independent claim is claim 1.
• Independent Claim 1:
  • A housing assembly of button cell, comprising: a housing and a conductive part...
  • the housing is provided with a through hole, and the conductive part penetrates through the through hole,
  • a sealing rubber ring for sealing and insulating the conductive part and an inner wall of the through hole is provided between the conductive part and the inner wall of the through hole;
  • the conductive part comprises a columnar part penetrated through the through hole, and an end of the columnar part facing the cell is provided with a sheet part integrally formed with the columnar part, and an end of the columnar part facing away from the cell extends outwardly with a flanging around the columnar part;
  • an axial direction of the columnar part is provided with a fabrication hole for welding...
  • at least a part of a housing wall...has a thinning area...configured to be ruptured first to release an internal pressure...
  • an insulating sheet is clamped between the cell...and the second tab...
• The complaint does not explicitly reserve the right to assert dependent claims, as it is a declaratory judgment action challenging the entire patent.

III. The Accused Instrumentality

This is a declaratory judgment action in which the Plaintiff, ATL, alleges that the Defendant's patent covers technology that ATL itself invented and embodied in its own products. Therefore, the "accused instrumentality" is conceptually the technology described in the '286 Patent, which ATL alleges is its own misappropriated design Compl. ¶58

Product Identification

• ATL's "first-generation" and "second-generation" lithium-ion coin cell battery designs Compl. ¶13 Compl. ¶29

Functionality and Market Context

• The complaint alleges that ATL developed a first-generation coin cell design around September 2019 Compl. ¶12 This design included a housing, a pole (conductive part) inserted into a through-hole, a sealing ring, and a gasket between a flange on the pole and the sealing ring Compl. ¶13 A technical drawing from ATL's alleged confidential design documents is provided in the complaint. The complaint includes a side-by-side visual comparison, asserting that Figure 4 of the '286 Patent is identical to ATL's confidential first-generation design Compl. p. 8
• The complaint alleges these batteries are commercially significant and have been incorporated into products from major consumer electronics companies, such as the HUAWEI FreeBuds Pro 2 and HUAWEI Watch GT 3 Compl. ¶16 Compl. ¶25

IV. Analysis of Inventorship Allegations

The complaint's central thesis is that the '286 Patent claims an invention developed by ATL, not CosMX. The analysis therefore focuses on mapping the patent's claims to the features of ATL's prior designs as alleged in the complaint.

'286 Patent Inventorship Allegations

Identified Points of Contention

• Inventorship & Derivation: The central dispute is one of fact: who invented the claimed subject matter? The case will likely depend on evidence demonstrating whether the named inventors on the '286 Patent independently conceived of the invention or derived it from ATL's confidential designs. The complaint alleges that former ATL employees and employees of an ATL vendor are named as inventors on the patent Compl. ¶18
• Evidentiary Questions: A key question will be what evidence ATL can produce to corroborate its timeline of invention and the specific structural details of its designs predating the patent's priority date. Similarly, the court will likely examine the chain of custody for the alleged trade secrets and whether they were transmitted to the named inventors as alleged Compl. ¶15 Compl. ¶18 Compl. ¶22
• Scope Questions: While not a traditional infringement analysis, a question may arise as to whether the specific embodiments described and claimed in the '286 Patent are coextensive with the designs allegedly developed by ATL. The complaint's use of side-by-side identical drawings suggests it will argue for a complete overlap Compl. p. 8

V. Key Claim Terms for Construction

Because the core dispute is over inventorship and derivation rather than infringement, claim construction may be less central than in a typical patent case. However, the scope of certain terms could be relevant to determining the extent of any alleged derivation.

• The Term: "integrally formed"
• Context and Importance: Claim 1 requires the "sheet part" of the conductive nail to be "integrally formed with the columnar part." Practitioners may focus on this term because the method of manufacturing the conductive part could be a point of distinction. If CosMX's development records show a different manufacturing process or structure than what ATL alleges it designed, it could be used to argue for independent invention.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification suggests the parts can be made separately and joined, stating that the sheet part and columnar part "may be separately processed and connected by welding or the like, or may be integrally formed" '286 Patent, col. 14:65-67 This language may support a construction where "integrally formed" includes permanently joined components, not just those formed from a single piece of material.
  • Evidence for a Narrower Interpretation: The plain meaning of "integrally formed" often implies manufacturing from a single, monolithic piece of material. The complaint's own technical drawings do not specify the manufacturing method, leaving open the question of what ATL's original design entailed Compl. p. 5

VI. Other Allegations

The complaint's patent-related declaratory judgment counts are interwoven with broader allegations of a scheme to misappropriate intellectual property.

• Trade Secret Misappropriation: The complaint includes counts for misappropriation of trade secrets under both the federal Defend Trade Secrets Act and the Virginia Uniform Trade Secret Act Compl. ¶¶74-86 It alleges that CosMX acquired ATL's confidential design documents through improper means, including by hiring away former ATL employees and gaining access through a mutual vendor Compl. ¶15 Compl. ¶18 Compl. ¶77 The filing of the patent applications that led to the '286 Patent is alleged to be an act of disclosing those trade secrets Compl. ¶77
• Inequitable Conduct: The complaint seeks a declaration of unenforceability based on inequitable conduct, alleging that CosMX and the named inventors failed to meet their duty of candor to the USPTO by filing an application for an invention they knew was derived from ATL's technology and by submitting inventor oaths in bad faith Compl. ¶¶62-63

VII. Analyst's Conclusion: Key Questions for the Case

This case appears to be less about nuanced claim interpretation and more about the factual history of the invention's conception and development. The central questions for the court are likely to be:

1. A core issue will be one of originality and derivation: Can ATL provide sufficient evidence to establish that it conceived of and documented the key features of the claimed invention before the '286 Patent's priority date, and that its confidential information was transmitted to and used by the patent's named inventors?
2. A key evidentiary question will be one of corroboration: Beyond the allegations in the complaint, what documentary evidence, such as dated design files, internal communications, and third-party records from vendors, can each party present to either substantiate the claim of derivation or prove independent invention by the named inventors?
3. A secondary issue may be one of corporate conduct: To what extent will the allegations of a broader "pattern and practice" of hiring ATL's engineers and copying its technology, including findings from prior litigation, be admissible and persuasive in establishing the intent required for the trade secret and inequitable conduct claims?