Lithium batteries, as one of the energy storage devices, are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium-ion batteries. The shape of lithium batteries includes variable soft pack batteries and fixed cylindrical and prismatic shapes.
Lithium batteries are used in various end products that require long-term energy storage. Due to its light weight and high energy density, it is particularly commonly used in devices such as smartphones, tablets and laptops, mobile communications, and electric vehicles. For example, high-capacity lithium-ion batteries that are currently being developed are also being tested in electric vehicles. Lithium batteries will become one of the main power sources for electric vehicles in the 21st century and will be applied in artificial satellites, aerospace, and energy storage. Regardless of the type, multiple stages in the production process of lithium batteries require the use of vacuum technology.
A typical lithium-ion battery cell consists of a positive electrode, a negative electrode, a separator, and an electrolyte. These units are arranged inside the packaging. Due to the highly reactive chemical properties of lithium metal, its processing, storage, and use have very high environmental requirements. Lithium batteries mainly require leak detection at the welding joints of the shell. If the electrolyte inside the lithium battery leaks due to the unsealing of the shell, it can react violently with a humid environment, causing serious harm to the environment and personnel, and affecting the service life of the equipment. Therefore, leakage testing is required during the assembly and sealing (cylindrical and prismatic units are welded) of lithium batteries. Depending on the production process, helium mass spectrometer leak detector or helium leak detection system can be selected.
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