Researchers engaged in battery performance testing almost all encounter such problems: equipment and instruments have reached the accuracy standards, sample preparation is correct, and experimental parameters are strictly controlled, but the test data always show significant deviations, high repeatability dispersion, falsely high internal resistance values, and chaotic fluctuations in the J-V curve. Many people mistakenly believe it is due to operational errors, but in fact, the inherent systematic errors of the two-wire test are holding them back. The resistance of the wires, the contact resistance of the probes, and the voltage drop in the circuit, along with minor impedance interference, directly undermine the authenticity of high-precision experiments, making it difficult for scientific research data to meet standards, trace back, and support papers and research projects.

The core key to precise testing lies in eliminating all additional interfering impedances. The four-wire battery fixture (Kelvin test fixture) relies on the professional four-terminal measurement principle, completely revolutionizing the traditional two-wire testing mode, achieving complete separation of the current circuit and the voltage sampling circuit, eliminating test errors caused by wires and contacts at the hardware level. It is a necessary device for low internal resistance, weak signal, and high-precision electrical testing of batteries, laying a solid foundation for various battery research tests, batch calibration, and quality inspection.

The Kelvin four-wire principle eliminates test errors from the root

The traditional two-wire fixture shares a set of lines for transmitting current and collecting voltage, and the lead resistance, contact oxidation resistance, and wiring voltage drop will all be included in the test results. Especially when testing low internal resistance batteries, the error is infinitely amplified, and the data is severely distorted. This four-wire battery fixture adopts a standard Kelvin four-wire testing structure, with two sets of lines working independently and completely isolated: one pair of dedicated lines is responsible for constant current output, building a stable power supply circuit; the other high-impedance dedicated line independently collects the true voltage at both ends of the battery, with the sampling circuit almost without current passing through and no additional voltage drop loss.

This separation design can precisely eliminate system interference caused by wire resistance, contact resistance, and wiring process, only collecting the true electrical parameters of the battery body, completely solving industry problems such as falsely high internal resistance, parameter drift, and curve jitter, making each set of test data true, accurate, repeatable, and traceable, perfectly meeting the strict data standards for journal publication, scientific research project initiation, and precise quality inspection.

Independent four-terminal contact design, low resistance and stable without false connection

The fixture adopts a completely independent four-contact split structure, with current contacts and voltage sampling contacts arranged separately and performing their respective duties, eliminating loop crosstalk problems. The core conductive contacts adopt a gold-plated anti-corrosion process, resistant to oxidation, electrolyte corrosion, and have extremely low contact impedance. Long-term high-frequency repeated testing and frequent disassembly and adjustment still maintain stable conductive performance, without oxidation false connection, signal attenuation, or data jump.

Combined with an even flexible clamping structure, the fixture can firmly fix various battery samples throughout the testing process without displacement, jitter, or contact drift, and will not compress the film electrode, photosensitive functional layer, and battery body, maximizing the retention of sample original performance, significantly improving experimental consistency and repeatability, and the data from multiple retests are highly unified.

High precision compatibility, specializing in low resistance and weak signal testing

For the core difficulties in battery testing - precise measurement of low internal resistance, collection of weak photovoltaic signals, and EIS electrochemical impedance testing, the advantages of the four-wire fixture are unparalleled. Whether it is micro-film batteries, dye-sensitized batteries, pouch cells, or small energy storage batteries, their internal resistance is extremely small, and the additional impedance of the two-wire test will directly cover the true data, causing the test to completely fail.

This four-wire fixture can accurately capture pA-level weak signals, efficiently avoid various additional impedance interference, accurately calculate open-circuit voltage, short-circuit current, fill factor, photoelectric conversion efficiency, and battery internal resistance, with data resolution and accuracy far exceeding that of ordinary two-wire fixtures, making it a core tool for high-precision microscopic performance characterization, aging monitoring, and parameter calibration of high-precision batteries.

Highly precise and durable with strong compatibility, suitable for all scenarios of scientific research conditions

The entire machine is made of high-strength, insulating and anti-corrosion materials, which are resistant to wear, aging, and electrolyte immersion. It is not affected by long-term high-frequency testing, aging experiments, repeated disassembly, adjustment and calibration in complex conditions. The machine body is not prone to deformation and the structural stability is long-lasting. The standardized interface design enables direct compatibility with various battery testers, source meters, electrochemical workstations, and photoelectric testing systems, without the need for adapter or modification. It quickly builds a standardized and high-precision testing platform.

The equipment has extremely strong versatility, suitable for various types of samples such as dye-sensitized batteries, thin-film photovoltaic batteries, micro-cells, pouch batteries, and button batteries. It widely covers all scenarios such as university teaching and training, front-line research of scientific research institutions, quality inspection and calibration of new energy enterprises, and pilot batch testing. It also takes into account basic teaching and high-end precise research.

Four-wire Kelvin principle | Circuit complete separation | Eliminate systematic errors | Low-resistance stable conduction | Precise data traceable | Universal scene adaptation

Precise data is the most solid backing for scientific research achievements. The upgraded four-wire professional test fixture eliminates error interference and invalid re-testing. With hardware precision, it stabilizes each experimental result, making battery research testing more efficient, accurate, and professional!