The maintenance of the sealing performance of lithium battery packs should start from aspects such as sealing structure inspection, sealing component maintenance, environmental control, sealing performance testing, and operation norms. The following are specific tips:

Inspection of sealing structure

Regularly inspect the sealing parts: Check the connection between the battery pack casing and the cover, the connection between the terminal post and the casing, and other sealing parts to see if there are any signs of loosening, deformation or damage. For instance, if the sealing strip at the connection between the casing and the cover is found to be aged or cracked, it should be replaced in time to prevent moisture and impurities from entering the battery pack.

Pay attention to the sealing welds: For lithium battery packs sealed by welding, it is necessary to check whether there are any defects such as cracks and pores in the welds. If there are problems with the weld seams, it may lead to seal failure, affecting the performance and safety of the battery pack.

Seal maintenance

Select appropriate sealing components: According to the usage environment and requirements of the lithium battery pack, choose suitable sealing component materials, such as fluororubber, hydrogenated nitrile rubber, and silicone rubber, etc. These materials have durability under harsh conditions and environmental adaptability, and can provide good sealing effects.

Regularly replace the seals: Seals will age and wear out over time and with use, thereby reducing their sealing performance. Therefore, the seals should be replaced regularly at the prescribed time intervals or after the prescribed mileage of use.

Environmental control

Avoid damp environments: Lithium battery packs should be stored in a dry environment with a relative humidity not exceeding 60%. In a humid environment, moisture may seep into the interior of the battery pack, leading to a decline in insulation performance and even causing safety accidents such as short circuits. If the battery pack needs to be used in a humid environment, moisture-proof measures should be taken, such as installing moisture-proof covers, etc.

Prevent chemical corrosion: Lithium battery packs should be kept away from corrosive substances such as acids, alkalis, and salts, as these substances may corrode the battery pack's casing and seals, leading to seal failure. If the battery pack must be used in an environment where it may come into contact with corrosive substances, protective measures should be taken, such as applying an anti-corrosion coating on the surface of the battery pack.

Sealing performance test

Regular inspection: Regularly conduct sealing tests on lithium battery packs. This can be done using equipment such as a gas tightness tester. Fill the battery pack with gas at a certain pressure and then observe the changes in pressure. If the pressure drops too rapidly, it indicates that there is a sealing leakage problem with the battery pack, and timely inspection and repair are required.

Selection of detection methods: For single cells, helium mass spectrometry with better accuracy is usually adopted for leak detection. For the sealing leak detection at the battery pack level, the focus is more on simplicity, speed and efficiency. By pressurizing a certain volume of gas into the sealing cavity and measuring the change in internal pressure during the container's pressure holding process, the airtightness of the product can be analyzed.

Operating Specifications

Standardized installation and maintenance: When installing and maintaining lithium battery packs, strictly follow the operating procedures to avoid damaging the sealing structure due to improper operation. For example, when installing the battery pack, make sure that the seals are installed in place and the tightening torque of the bolts meets the requirements.

Avoid external force damage: During use, prevent the battery pack from being impacted or squeezed by external forces to avoid damaging the sealing structure. For instance, when transporting battery packs, appropriate packaging materials should be used to prevent the battery packs from being collided during transportation.