A published application is not a granted patent, and it is not a product. US20260204669A1, “Battery Manufacturing Process, Battery Treatment Device, Battery, and Electric Device,” was laid open on July 16, 2026 and is assigned to CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED. It has not issued; its claims have not been examined to allowance. Sixteen claims, four independent — 1, 12, 15, and 16. This brief asks what those claims actually recite.

What claim 1 recites — and what it does not

Claim 1 is short enough to be worth stating in full. It is directed to a battery manufacturing process comprising: acquiring a battery to be treated; injecting an electrolyte into the battery; and charging the battery before sodium in the battery is reduced at a negative electrode. That is the entire independent claim. Three steps, and the operative limitation lives in a single word of sequence: before. The claim does not recite a voltage, a temperature, a duration, or a pressure. It recites an ordering condition — charge the cell, but stop short of the point at which sodium reduces at the negative electrode.

One feature of that wording deserves flagging, because on a desk whose discipline is reading claims rather than titles, it is the observation that matters most: the term “sodium-ion” never appears in claim 1. The claim says “a battery.” Sodium enters the claim only obliquely, through the limitation that the charging occur before “sodium in the battery is reduced at a negative electrode,” and it enters the record separately through the CPC classification, where H01M 10/054 covers non-lithium secondary cells. The abstract and the description are written in sodium terms throughout. The independent claim, as literally drafted, is not. That gap between the sodium framing and the claim’s literal recitation is a fact about the document, and it is worth recording as such — not as a reading of anyone’s intent. Independent claim 12 mirrors claim 1 in apparatus form, reciting a battery treatment device with a battery acquisition unit and a charge unit “configured to charge the battery before sodium in the battery is reduced at a negative electrode.” Claim 15 is a battery prepared by the process of claim 1; claim 16 is an electric device comprising the battery of claim 15. Claims 15 and 16 are product-by-process and downstream-device dependencies on the same condition.

Where the mechanism actually lives: the dependent claims

If claim 1 supplies the sequence, claim 2 supplies the physics. It narrows the charging step to a defined electrochemical window.

charging the battery at a first charge voltage, wherein the first charge voltage is higher than a reduction potential of H+, and the first charge voltage is lower than a reduction potential of sodium.— BATTERY MANUFACTURING PROCESS, BATTERY TREATMENT DEVICE, BATTERY, AND ELECTRIC DEVICE, US20260204669A1

That window is the disclosed idea in one line. Charge above the reduction potential of H+ and residual water in the cell — or hydrogen ions liberated as water decomposes in the electrolyte — takes electrons at the negative electrode and leaves as hydrogen gas. Stay below the reduction potential of sodium and no sodium metal plates while that is happening. The water is consumed by a deliberate sacrificial pre-charge rather than excluded beforehand. Claim 3 puts numbers on the window: a first charge voltage of 1.0 V to 2.9 V, preferably 1.7 V to 2.9 V, more preferably 2.5 V to 2.7 V. Claims 9 and 10 then recite a second charge voltage above sodium’s reduction potential and/or above the reduction potential of an electrolyte additive, greater than 2.9 V and up to 4.2 V — the step at which sodium is finally permitted to deposit, on a cell from which the water has already been driven off. These are claimed preferred ranges in a pending filing, not disclosed production settings.

The remaining dependents are process assists on the same mechanism. Claims 4 and 5 heat the cell during the first-voltage charge, at 25° C. to 70° C., preferably 45° C. to 60° C. Claims 6 and 7 evacuate it, at a vacuum of at least −80 kPa and less than 0 kPa, preferably −30 kPa to −10 kPa — drawing off hydrogen as it forms. Claim 8 recites a charge time at the first voltage of 4 h to 48 h, preferably 6 h to 18 h. Claim 11 closes the process out with electrolyte injection, evacuation, protective gas injection, and sealing. Note the order the process depends on: electrolyte goes in first, by design, so that water trapped in the electrode sheets and separator can diffuse into the electrolyte and reach the negative electrode, where the charging step can react it away. The description states that at 12 h the water removal efficiency is close to 90 percent — a statement in the description about the disclosed process, not a validated cell specification.

The record states its own prior-art baseline plainly, and it is a narrow one. In the prior art, the description says, water is generally removed from batteries through high-temperature baking, but by that method the water inside the battery cannot be effectively removed. The comparison the document draws is electrochemical water removal versus thermal baking — nothing wider. It names a case where baking is said to struggle: a cell with a Nasicon-type phosphate positive electrode material system. The stated reason any of this matters is also in the description: reduced sodium metal has high activity and is prone to violent reactions with water in the battery, generating gases such as H2, causing significant capacity loss. The description further notes that residual water hinders sodium deposition, and that uneven sodium deposition easily causes local dendrites, leading to short circuits in a cell — a statement of the problem, not a claim that this process eliminates it. The description writes the reduction as 2H2O+4e−→H2+2OH−; that is how it is printed in the record, and it is reproduced here as printed rather than corrected. The filing carries CPC codes H01M 10/446, H01M 10/054, and H01M 10/058 — charging methods, non-lithium secondary cells, and cell manufacturing processes. That triad maps the disclosure fairly: a formation-process filing, classified as one, whose sodium reading rests on 10/054 and the description rather than on claim 1’s own words.

Five other applications carrying Contemporary Amperex assignee strings published in the same July 16 drop, and they sit somewhere else entirely. US20260204759A1 recites a cell housing in which both tabs exit the same end surface, one routed to the terminal and the opposite-polarity tab directly to the housing. US20260204612A1 is a winding member assembly whose secondary members retract inward so the assembly narrows for jelly-roll release. US20260204611A1 is a tab bending mechanism — a driven pressing plate that reciprocates to fold a cell tab onto the terminal post. US20260201509A1 claims an aluminum alloy for battery boxes, formulated to suppress the Al2Cu phase. US20260200307A1 is a vehicle record: a pack with a raised platform tucked under the seat cushion to add volume without intruding on passengers. Five of the six are cell hardware, assembly equipment, materials, or pack structure. The hero is the only chemistry-and-formation record among them, and the only one that touches sodium at all. That is an observation about these six documents on this one date — not a statement about a portfolio, a roadmap, or a strategy, none of which these records speak to. What the record supports is bounded and worth restating: a pending application, published not granted, whose independent claims recite a sequencing condition — charge before sodium reduces — and whose dependent claims supply the voltage window, heat, vacuum, and dwell time that make the condition operable. Whether the claims survive examination in this form is a question for prosecution, and this brief takes no view on it.