Anyone involved in battery photoelectric testing knows that the biggest隐患of open-loop testing is never the sample error, but the uncontrollable environmental interference. Direct sunlight, air turbulence, dust adhesion, temperature and humidity fluctuations, along with uneven clamping force, loose contacts, and drift in contact resistance， seemingly minor variables， can directly cause fluctuations in the J-V curve， changes in conversion efficiency， and large dispersion in retest data. The painstakingly prepared samples and repeatedly adjusted schemes end up failing at the testing fixture.

To achieve repeatable， comparable， and publishable experimental data， the first step is to lock down the test environment variables. The 3M sealed battery fixture is specifically designed for standardized testing of solar cells， dye-sensitized cells， and thin-film photovoltaic cells. With its fully sealed shielding structure， uniform stable clamping， and four-wire low-resistance testing design， it completely resolves the testing pain points of open-loop fixtures， providing a stable， clean， and unified sealed testing environment for scientific research testing.

Integrated fully sealed cavity， isolating all external interference

Unlike the drawbacks of ordinary open-loop fixtures that lack protection and are prone to interference， this fixture adopts an overall sealed cavity structure， fully isolating the influence of environmental air flow， dust， stray light， and temperature and humidity changes on the testing process. From a physical perspective， it uniformly sets the testing conditions and eliminates data errors caused by external variables. The top of the cavity is equipped with a high-transparency quartz observation window， with high light transmittance and no spectral interference. It allows for real-time observation of the battery sample reaction state， film changes， and electrolyte conditions without opening the cover， ensuring a continuous test without interruption and guaranteeing that each experiment's environmental conditions are highly consistent. It perfectly suits various static performance tests and dynamic aging tests of photovoltaic cells.

Level stable voltage precise clamping， no sample pressure， no loose connection， no drift

The fixture is equipped with the industry standard 2.54mm electrode spacing， compatible with 6 channels and below standard battery cells， micro-cells， and thin-film cells， and has strong versatility. It is paired with an exclusive adjustable locking base， which can precisely adjust and lock the test level， completely avoiding problems such as tilted manual clamping， unilateral force application， and loose contacts.

Flexible balanced clamping structure， pressure is uniform and controllable， can firmly fix the sample， eliminate test jitter， displacement， and contact drift， and will not compress and damage the film electrodes or photosensitive functional layer， maximizing the retention of the sample's original performance， significantly improving the experimental repeatability and data consistency， and making multiple retests results stable and controllable.

Standard four-wire BNC interface， low resistance conduction， precise data traceability

High-precision battery testing must avoid systematic errors caused by lead resistance and contact resistance. The 3M sealed fixture is equipped with dual BNC standard interfaces， strictly following the four-wire test principle， separating and independently testing the current and voltage circuits， accurately eliminating lead drop and contact impedance interference， allowing for more accurate testing of open-circuit voltage， short-circuit current， fill factor， photoelectric conversion efficiency， internal resistance， etc.， and ensuring that the data is true and consistent with the sample's own performance.

The core conductive contacts use high-quality and precise conductive materials from 3M， with gold plating anti-corrosion treatment， resistant to oxidation， electrolyte corrosion， and have extremely low contact resistance. They do not oxidize， decay， or jump over during long-term high-frequency use， and the curve is smooth and stable， fully meeting the high-standard data traceability requirements for journal papers， scientific research project funding， and product quality inspection.

Corrosion-resistant exquisite body， suitable for laboratory high-frequency scientific research conditions

The entire machine is made of high-strength insulating and corrosion-resistant materials， resistant to wear， aging， and electrolyte immersion. It is not afraid of long-term aging tests， repeated disassembly， and high-frequency calibration in complex experimental scenarios. The body does not deform and the structural stability is long-lasting. The minimalist integrated structure requires no complex debugging， can be installed and tested immediately， significantly shortening the experimental preparation time， and is highly adaptable for batch sample calibration， comparison testing， teaching and training scenarios.

The equipment has extremely strong compatibility and can directly connect with various photoelectric testing instruments, source meters, battery testing systems, etc. It can quickly build a standardized closed testing platform, and is suitable for use in all scenarios of university laboratories, research institutes, and new energy enterprises.

It covers multiple scenarios and specializes in precise photoelectric testing of photovoltaic cells.

It is widely compatible with dye-sensitized solar cells, silicon-based cell wafers, thin-film photoelectric cells, and micro-energy storage cells for photoelectric performance testing, electrical parameter calibration, long-term aging monitoring, teaching experiment demonstrations, and scientific research innovation and development. It also takes into account basic teaching and high-end research, and is a necessary standard equipment for photoelectric cell laboratories.

Full closed protection against interference | Four-wire precise testing | Voltage stabilization and sample protection | Low resistance stable conduction | High-quality durable and worry-free

The persuasiveness of scientific research data stems from the absolute controllability of the testing environment. A 3M closed-type battery clamp locks variables, stabilizes data, and avoids errors, ensuring that each set of experimental results is true and reliable, and protecting your scientific research achievements!