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Lithium battery leakage detection: analysis of the advantages and disadvantages of four mainstream detection methods

2024.07.16

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According to public information, China's new energy vehicles will account for 59% of the global automobile market in 2024.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, and 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 (containing lithium compound) of the battery cellcarbon 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 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 methods

According to actual customer analysis, most manufacturing companies use the pressure decay method,‌VOC detection method (‌Organic matter volatilization method)‌, mass spectrometry and helium detection methods.

Take the pressure decay 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；其响应速度较慢，误判率高，且只能检测壳体的密封。

‌‌‌VOC detection method,By detecting the concentration of volatile organic compounds, the accuracy is higher than the pressure decay method, which is 1*10⁻⁶Pa·m³/s，响应速度较快。但tvocsusceptible to interference, leading toThe false detection rate increases accordingly;And it needs to be calibrated regularly using standard gas, which increases the cost of consumables.‌

Helium detection method uses helium gas detection, with the highest accuracy, up to ‌5*10^-13Pa·m³/s。但使用成本较高，氦气40L约3000元；且因氦气密度的原因会堆积在上方，检测不出底部的漏孔。电池内部充注的氦气被电解液包裹，如果电解液没有经过漏孔泄漏出来那氦气就出不来，也检测不出泄漏。

In comparison, mass spectrometry (RGA) has no consumable cost and higher accuracy, up to 1*10^-12Pa·m³/s；直接检测电解液，不受干扰且无漏判。

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Hai Ruisi onlineMass spectrometer, to protect "lithium"

Based on the needs of customers for high-precision electrolyte testing and the need to improve its own product matrix, Hirays Technology has made a comprehensive layout in the lithium battery industry. 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 has launched a core independent research and development product - HM online mass spectrometer analyzer.

It performs mass spectrometry analysis on the electrolyte through mass spectrometry (RGA), quantitatively and qualitatively analyzes the concentration and composition of the residual gas in the vacuum chamber, and performs 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 used in the factory of a leading automobile company.

Advantages of HM online mass spectrometer

1. Low cost: no need to use helium, hydrogen, etc., low cost of use;

2. Strong anti-interference ability: directly detects electrolyte volatile gases, and other components that do not participate in the detection can be filtered out;

3. Wide range of applications: It can detect most commonly used electrolyte solvents EC, DMC, EA, PC, EMC, PP, and DEC, and has a wide range of applications;

4. High accuracy: up to 1*10^-12Pa*m³/s，能检测其他方式检测不到的微小泄漏；

5. Efficient testing: short measurement time, multiple cavities can be tested in turn, and high output;

6. Reserved automation interface: has integration capabilities in automated production lines;

7. ConnectableMES system: Conveniently track quality data.

Hirays online mass spectrometer not only shines in power battery leak detection, but can also be widely used in other automotive parts.Sealing test，likeEngine, fuel system, cooling system, braking system and air conditioning pipelineswait;as well asOther industries that require high-precision leak detection, such as semiconductors, vacuum coating, aerospace industry, heat treatment, etc..Its high-precision and excellent detection performance can provide manufacturing companies withComprehensive, one-stop sealing and leak detection solutions。

hirays product matrix has been further improved, and standard leak holes help customers efficiently calibrate the leak rate of air-tight instruments, making test results more reliable

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hirays mass spectrometry leak detection system: micron-level detection accuracy, escorting "lithium"