The solid-state battery industry is experiencing unprecedented rapid development. Recently, the world's first GWh-level new solid-state battery production line has settled in Wuhu, Anhui, China, indicating that solid-state battery technology is gradually moving towards large-scale production. It is generally believed in the industry that solid-state batteries will be mass-produced around 2027, and their energy density, safety and cycle life are better than traditional liquid batteries. With the continuous expansion of the new energy vehicle and energy storage system markets, solid-state batteries will usher in huge demand and have broad market prospects. At the same time, government policy support and technological innovation will also inject strong impetus into the development of the solid-state battery industry.Hicy (Suzhou) Co., Ltd. is committed to developing characterization methods, standardized/automated/intelligent integrated characterization and evaluation solutions to resolve customer concerns. It has also conducted extensive research on solid-state battery characterization methods and can provide characterization and evaluation solutions at the material, electrode, and cell levels.1. Material Characterization
1.1 Powder resistance & compaction density
ACCFILM Powder Resistivity & Compacted Density Tester is an instrument based on the new multi-probe measurement principle, using a one-stop powder forming device and equipped with a fully closed-loop intelligent servo control system to achieve one-stop testing of powder resistivity & compacted density. The new multi-probe design combines the advantages of the two-probe and four-probe test principles, solving the long-standing pain points of powder testing.1.2 Ionic conductivity of solid electrolytes
The ACCFILM solid electrolyte performance evaluation system is based on a new multi-probe measurement principle, uses a one-stop electrolyte molding device and is equipped with a fully closed-loop intelligent servo control system to monitor the electronic resistance, ionic resistance and electrical properties of solid electrolytes under different pressure conditions.2. Electrode characterization
2.1 Evaluation of the uniformity of the A/B surface of the electrode sheet resistance
The coating consistency on both sides of the pole piece is indeed very important in battery production because it affects the electrochemical performance and safety of the battery. After years of research and development, Chuanyuan Technology has adopted a controllable pressure multi-probe resistance method based on high-precision displacement, voltage and current, pressure, temperature and humidity sensing to achieve continuous, accurate and stable monitoring of the resistance characteristics of the pole piece under extreme conditions. Compared with the traditional four-probe method, a new measurement electrode is added on the basis of the four-terminal measurement method to form a new multi-probe measurement solution, which realizes the overall resistance of the pole piece and the decomposition test of the A/B side resistance of the pole piece, providing a new method for evaluating the resistance of the pole piece.The multi-channel electrode wettability detector (Wet series) launched by Hicy uses a precision mass/resistance module to monitor the change of electrode resistance. The system processes the mass/resistance change rate and change amount in real time. The change time and change amount reflect the electrolyte infiltration rate of the electrode, and the change curve reflects the difference in electrode pore curvature, so as to evaluate the consistency of electrode pore.2.3 In-situ electrical expansion thickness
ACCFILM pole piece expansion rapid evaluation system is based on a creative zero-friction in-situ expansion fixture or single-layer laminated battery. It integrates high-precision displacement, voltage, current, temperature and humidity and other core sensors to achieve a system for rapid in-situ expansion thickness detection at the pole piece level.2.4 Layered sampling of coatings in the thickness direction
ACCFILM pole piece binder distribution analysis system is a cutting-edge testing equipment, whose core technology combines high-precision servo automatic sampling and thermal gravimetric detector. The system is specially designed to accurately analyze the distribution of binders in pole pieces, thus helping users to gain a deeper understanding of the performance of battery materials.3.1 In-situ expansion characteristics
When the battery cell is actually used, it is bound in the module. Changes in thickness/volume/pressure during charging and discharging cause expansion forces that directly affect the electrical performance, safety and reliability of the battery cell, module and battery pack. In order to study the above changes and correlations, it is very important to simulate and emulate the structure and state of the battery cell during actual operation (i.e., the in-situ expansion characteristic parameters of the battery cell). Chuanyuan Technology has developed a multi-channel in-situ expansion force detection solution, which realizes in-situ expansion measurement of buckle cells, single-layer stacks, soft packs and square shell battery cells/modules.3.2 In-situ gas production characteristics
ACCFILM battery cell in-situ gas production volume test system is based on the theoretical principles of Archimedes and ideal gas state equations. It measures the change in buoyancy of samples at a certain temperature and realizes the in-situ volume and gas production rate detection of battery cells.ACCFILM battery cell in-situ pressure test system is a system based on high-precision pressure sensor, adapter armor and test software. It is used to measure and monitor the pressure changes in the process of gas generation in the battery cell, and collect and record the data, realizing a one-stop battery cell gas production pressure detection system. It is currently the first fully integrated gas production pressure measurement equipment, with an ultra-wide measurement temperature range of -40℃~250℃, a unique buffer structure design, and prevents electrolyte contact corrosion of sensors.3.3 Online & Offline Thickness
ACCFILM thickness testing system is an instrument based on the principle of pressurized contact thickness measurement, using high-strength precision mold frame, displacement sensor, etc. and equipped with a fully closed-loop intelligent servo control system to achieve one-stop thickness, voltage internal resistance and compression modulus testing of battery products.
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