In-depth analysis of the battery pack air tightness testing standards, an article to read the principles and methods

With the continuous development of new energy battery technology, the performance of battery packs is also improving. The energy density of battery packs is getting higher and higher, which can provide more power or range. At the same time, the battery pack is getting smaller and lighter, which is easy to carry or install. Correspondingly, the safety requirements of battery packs are also getting higher and higher, and need to have stronger protective measures.

Battery pack refers to a complete battery system that is made from a combination of multiple cells and made through system design, electrical connection, mechanical structure, thermal management and other processes. Battery pack is the final form of the battery, is the battery in the actual application of the sample.

Ⅰ.The main application areas for battery packs include

New energy vehicles:Battery pack is the core component of new energy electric vehicles, which is the source of power provided by electric vehicles. The energy density, safety and reliability of the battery pack directly affect the range, safety and service life of the electric vehicle.

Energy storage systems:Battery packs can be used to store electrical energy for emergency power supply, photovoltaic power storage, wind power storage and other applications.

Consumer Electronics:Battery packs are widely used in consumer electronics such as cell phones, laptops, tablets, and wearable devices.

Industrial Applications:Battery packs can also be used in industrial robots, drones, medical devices and other industrial applications.

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The safety of new energy power battery packs is crucial as a core component in electric vehicles, energy storage and other fields.Waterproof sealing is one of the important indicators of battery pack safety, and airtightness testing is an essential and important part of battery pack safety testing.

Battery pack airtightness testing is mainly for the battery pack shell, interface, connectors, etc. to ensure that the battery pack is not contaminated or invaded by dust, water vapor and other impurities in the external environment, to prevent the battery pack from short-circuiting, explosions and other safety accidents.

Ⅱ.National testing standards

Airtightness testing standards for the new energy battery industry are usually set by relevant industry associations, government agencies or international organizations. The latest applicable testing standards for new energy batteries in our country at present:GB 38031-2020 Safety Requirements for Power Storage Batteries for Electric Vehicles

Cell pressure loading test machine to accurately assess the power battery pack airtightness and pressure resistance, constant pressure pull burst and variable load pressure resistance test details

III.Battery Pack Air Tightness Testing Methods and Principles

1. Pressure decay method:Also called the pressure drop method, the current mainstream gas tightness testing method. When testing, the battery pack is filled with gas at a certain pressure, and then the change in air pressure is observed. If the gas pressure drops, it indicates that the battery pack is leaking.

2. Helium Leak Detection: also called helium detection method, the current mainstream airtightness testing method.Helium is injected into the battery pack and a helium detector detects the presence of helium leaks inside the battery pack.

3. Water immersion method: also known as the soak method, due to the slow testing efficiency and poor accuracy has been replaced by the pressure drop method and helium detection method.The test is performed by submerging the battery pack in water and then observing the presence of air bubbles inside the battery pack. If bubbles are present, the battery pack is leaking.

IV.What are the battery pack testing equipment

JCGK is currently launching new energy testing equipment, for example:Airtightness Tester, Burst Pressure Tester, Breathing Cycle Tester, Breathing and Bursting Machine, Pressure Loading Tester, Gas Pressure Resistance Test Equipmentetc., widely used inCells, power batteries, energy storage batteries, square aluminum shell lithium batteries, cylindrical batteries, battery covers, battery shells, PACK battery packs, battery packs, battery cells, breathing valves, explosion-proof valvesThe safety testing for the new energy battery industry.

V. Summary

Battery pack is an important part of the battery technology, with the continuous development of battery technology, battery pack will be used in more areas.

Through strict air tightness testing and related safety performance testing, the quality and safety of the battery pack can be effectively guaranteed, thus ensuring the safe operation of new energy vehicles, energy storage batteries and other products.

To learn more detailed airtightness testing program and application cases, please pay attention to [Jingcheng Engineering Airtightness].