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Nov 04, 2026
Engineering summary: Sodium-ion cell data can support promising cold-weather and high-power applications, but a cell curve is not a finished battery specification. Confirm the exact cell, test method, voltage limits and pack protections before selecting a battery for a vehicle, UPS or energy-storage project.
Prepared by SodiumSolidBattery.com on 4 November 2026. This guide organizes the supplied Wirentech technical presentation into observations, calculations and design checks. It is an application reference, not a certification report or a model-specific operating manual. The sodium-ion slides and the separate solid-state slides are evaluated separately.
| Topic and source pages | Information visible in the presentation | What still needs confirmation |
|---|---|---|
| Cycle performance, pp. 2-3 | Curves at 25°C and 45°C, with 0.5C/0.5C and 1C/1C labels; solid and dotted segments. | Raw cycle logs, sample count, voltage limits, depth of discharge and the boundary between measured data and projection. |
| Voltage window, p. 5 | 0.5C cycling traces labelled 1.5-3.95V and 0-3.95V. | Matched cycle counts and the permitted routine operating window for the exact cell. |
| Storage recovery, p. 8 | Recovery labels of 100.0%, 99.4%, 99.1% and 98.7% after 1, 2, 3 and 6 months at 0V. | Cell identity, storage temperature, recovery protocol, sample count and variation. |
| Pulse power, pp. 10 and 14 | 30C, 15-second pulse examples; p. 14 identifies a 12.5Ah example at -20°C. | Loaded voltage acceptance, starting state of charge, repeat-pulse behavior and pack-level limits. |
| Cold operation, pp. 13 and 15 | A 160BL-12.5Ah discharge plot including -40°C; a separate -20°C charging chart labelled 20A. | Whether these charts refer to the same model; soak conditions, charging voltage and subsequent performance. |
| SOC and system integration, pp. 18-19 | An OCV-SOC comparison and a discussion of golf-cart regenerative charging. | Rest protocol, temperature dependence, BMS calibration and controller charge-limit coordination. |
C-rate converts cell capacity into current: current in amperes equals C-rate multiplied by rated capacity in ampere-hours. Thus 30C applied to the 12.5Ah example corresponds to 375A, and 10C corresponds to 125A. These are arithmetic conversions of the stated test example, not current ratings for a 12V 100Ah or 48V 100Ah pack. Pack current also depends on the cell arrangement, BMS, conductors, protection devices, connectors and thermal design.
Nominal energy is nominal voltage multiplied by capacity. A 48V 100Ah example gives 4,800Wh. If all nominal energy were available at a continuous 700W load, the arithmetic result would be about 6.9 hours. Actual runtime requires usable energy at the relevant load and temperature, plus inverter losses and discharge limits. For a sloping voltage curve, measured watt-hours are especially useful because ampere-hours alone omit the voltage contribution.
A cold-discharge plot addresses energy delivery under its stated conditions. It does not establish a permitted charging current at the same temperature. The separate -20°C, 20A chart is evidence to request a charging test report, not a universal charging instruction. Compare charge acceptance, delivered watt-hours, minimum loaded voltage, cell temperatures and subsequent capacity using a controlled, model-specific protocol. Published research describes low-temperature limitations at electrodes, electrolytes and interfaces; performance depends on the system design. Li et al., Carbon Energy, 2024.
The supplied cycle plots include dotted continuations. Their endpoints must not be presented as completed cycle testing without the underlying logs. A claim of 5,000 cycles needs a stated capacity-retention endpoint, test temperature, depth of discharge, voltage window, charge and discharge rates, rest periods and sample count. Calendar aging is a separate requirement for standby systems.
| 0V storage interval | Capacity recovery shown on source p. 8 |
|---|---|
| 1 month | 100.0% |
| 2 months | 99.4% |
| 3 months | 99.1% |
| 6 months | 98.7% |
These percentages are transcribed slide labels. They are not a guarantee for every sodium-ion chemistry or assembled pack, and they do not define the normal discharge limit. A 2025 study by Smith and Gladwin examined zero-volt operation of a particular commercial sodium-ion cell and reported limited changes in capacity delivery and DC resistance under its test procedures. That result supports model-specific investigation. It does not certify the products discussed here. Read the research record.
A sloping open-circuit voltage curve may help estimate state of charge after a defined rest. Voltage under load also includes resistance and polarization effects. Use a calibrated model, current measurement, temperature information and defined correction points. For vehicles, the controller must coordinate regenerative charging with the BMS charge-current and cell-voltage limits. A protection trip should not be the normal method of regulating regenerative power.
Pages 23-28 form a separate solid-state section. Page 24 describes an LFP-based comparison, while page 26 includes discharge traces beginning near 4.2V. The presentation does not establish that these are the same cell model. The composition, remaining liquid content, cell identification and report methods are needed before assigning an all-solid-state classification or combining these figures into a datasheet. Safety-test photographs on p. 28 are not a substitute for complete reports with defined acceptance criteria.
Page 1: the cathode equation is presented as discharge although sodium removal from a layered cathode normally describes charging; revise the reaction direction and define the example chemistry.
Page 12: the English title says discharge, while the Chinese chart title and rising voltage trace indicate charging. Confirm the test before quoting an 8C continuous rating.
Page 27: some displayed capacity ratios do not match the listed capacities; recalculate against the specified baseline before reuse.
Do not generalize zero thermal-runaway risk, no gas generation, universal 5,000-cycle life or a universal materials-cost advantage from this presentation.
Exact equipment model, DC voltage range, charge source and communications.
Continuous load, peak current, pulse duration, repeat interval and minimum operating voltage.
Cold and hot ambient conditions, installation space, enclosure and thermal constraints.
Required usable energy, backup duration, design life and service access.
Destination market and the applicable model-specific test or certification documentation.
Source register: Wirentech, Sodium battery PPT(1).pdf, 28-page technical presentation supplied for this review. Page numbers refer to that presentation; test dates and complete raw logs were not supplied. Literature links above provide context only; they do not verify the supplied charts or establish product certification.
Send the equipment model, operating voltage range, load profile, temperature range and expected order quantity. Our team can review the configuration and identify the model-specific documents needed for your project. Request a technical review or explore sodium-ion battery options.
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