Lithium battery leakage detection: analysis of the advantages and disadvantages of four mainstream detection methods
According to public information, in 2024, China's new energy vehicles will occupy 59% of the global automobile market.China's battery production will also account for 76% of the world's total production, becoming an important force leading the global energy transformation.As the core component of electric vehicles, lithium batteries are directly related to the vehicle's endurance and driving safety. Its quality level has become a decisive factor in the quality and experience of electric vehicles.Therefore, good quality control of lithium batteries is a necessary means for lithium battery companies to improve their competitiveness.
However, the positive electrode (containing lithium compound) and negative electrode (Carbon material) and the unique composition of the non-aqueous liquid electrolyte means that traditional air pressure testing methods cannot be used; and the lack of internal space after liquid injection makes it difficult to capture small leaks.Therefore, the main method on the market is to detect the electrolyte concentration to determine whether there is leakage in the battery after liquid injection.Analysis of the pros and cons of four common battery leakage detection methodsAccording to actual customer analysis, most manufacturing companies use the pressure attenuation methodVOC detection method (Organic evaporation method), detection methods of mass spectrometry and helium detection.Take the pressure attenuation method as an example. This method uses compressed air detection. This method has low cost and low accuracy, which is 1*10−4Pa·m3/s; its response speed is slow, the false positive rate is high, and it can only detect the sealing of the shell.VOC detection method,by detecting the concentration of volatile organic compounds, the accuracy is higher than the pressure attenuation method, 1*10−6Pa·m3/s, the response speed is faster. Buttvocis susceptible to interference, resulting inThe false detection rate increases;And standard gas calibration needs to be used regularly, which increases the cost of consumables.Helium detection method uses helium detection, with the highest accuracy, up to 5*10-13Pa·m3/s. However, the cost of use is high, about 3,000 yuan for 40L of helium; and due to the density of helium, it will accumulate above and the leak at the bottom cannot be detected. The helium filled inside the battery is wrapped by the electrolyte. If the electrolyte does not leak out through the leak, the helium cannot come out and the leak cannot be detected.In comparison, mass spectrometry (RGA) has no consumable cost and has higher accuracy, up to 1*10-12Pa·m3/s; Directly detect electrolyte without interference and no missed judgments.Heruis OnlineMass Spectrometer, to protect "lithium"Hirays Technology has made a comprehensive layout in the lithium battery industry based on the needs of customers for high-precision electrolyte testing and the need to improve its own product matrix. While equipped with VOC testing equipment, based on 16 years of R&D experience, customer case accumulation and large investment in R&D funds, Hirays Technology launched a core independent R&D product - HM online mass spectrometer analyzer.It uses mass spectrometry (RGA) to conduct mass spectrometry analysis of the electrolyte, quantitatively and qualitatively analyze the concentration and composition of the residual gas in the vacuum chamber, and perform leak detection and leak point search on the product. It has the characteristics of single-station integration, low cost, high precision, fast pace, high stability and intelligent detection, and has been successfully applied in the factory of a leading car company. HM online mass spectrometer advantages
1. Low cost: No need to use helium, hydrogen, etc., low cost of use;
2. Strong anti-interference ability: directly detect electrolyte volatile gases, and other components not involved in the detection can be filtered out;
3. Wide application: can detect most commonly used electrolyte solvents EC, DMC, EA, PC, EMC, PP, DEC, with a wide range of applications;
4. High precision: up to 1*10-12Pa*m 3/s, can detect tiny leaks that cannot be detected by other methods;
5. Efficient testing: short measurement time, multiple cavities can be tested in turn, high output;
6. Reserved automation interface: with integration capabilities in automated production lines;7. LinkableMES system: Convenient for tracking quality data.
Hairus online mass spectrometer not only shines in power battery leak detection, but can also be widely used in other automotive partsSealing detection,such asEngine, fuel system, cooling system, brake system and air conditioning linesetc;andOther industries that require high-precision leak detection, such as semiconductors, vacuum coatings, aerospace industry, heat treatment, etc.. Its high-precision and excellent detection performance can provide manufacturing companiesComprehensive, one-stop sealing and leak detection solution .
