In modern industrial production, especially in the field of battery pack manufacturing, airtightness testing is a key link to ensure product quality and safety. Today, we will introduce you to the relevant knowledge of battery pack airtightness testing, including testing requirements, methods, and one-stop solutions.

1、 The importance of airtight testing for battery packs

As a core component of numerous electronic devices and new energy vehicles, the airtightness of battery packs directly affects the performance and service life of the equipment. If there is a leakage problem with the battery pack, it may cause impurities such as moisture and dust to enter the interior, leading to faults such as short circuits and corrosion, and in severe cases, even causing safety accidents. Therefore, strict airtightness testing is an indispensable step in the production process of battery packs.

2、 Testing requirements

There are clear requirements for the detection of battery packs:

Test pressure: set to 20kPa. This pressure value has been verified through extensive experiments and industry standards, and can effectively detect possible leakage of battery packs within the normal working pressure range. When the interior of the battery pack is inflated to 20kPa, the gas molecules inside will exert a certain force on the sealing parts of the battery pack. If there are small gaps or holes, gas will leak out from these weak points.

Inflation time: 60s. During this period, the airtightness detector will continuously inject gas into the interior of the battery pack to achieve the set pressure of 20kPa. The inflation speed needs to be controlled. If it is too fast, it may cause impact on the battery pack and damage the internal structure; If it is too slow, it will affect the detection efficiency.

Voltage stabilization time: 60s. After inflation reaches 20kPa, this pressure needs to be maintained for 60 seconds. This is to stabilize the gas pressure inside the battery pack and fully expose any possible leakage channels. Because when the pressure is just reached, the gas may still be in an unstable state, and some small leaks may be temporarily masked. After the stabilization stage, the leakage situation will be more accurately presented.

Testing time: 10 seconds. After the voltage stabilization is completed, enter the formal testing phase and continue for 10 seconds. During these 10 seconds, the airtightness detector will monitor the changes in internal pressure of the battery pack and calculate the leakage rate based on the pressure change value.

Deflation time: 4 seconds. After the test is completed, the gas inside the battery pack needs to be purged, and the deflation time should be controlled within 4 seconds to quickly perform the next battery pack inspection. The total duration of the entire testing process is 134 seconds. During this process, if the leakage value does not exceed 100 Pa, the tested battery pack is judged as a qualified product. This leakage value standard is determined based on the sealing performance requirements of the battery pack and the actual usage environment, ensuring that the battery pack can effectively prevent external impurities from entering under normal use.

3、 Testing method: Direct testing method

Use direct testing method to perform airtight testing on battery packs. The core of this method is to use customized fixtures and testing platforms in conjunction with airtightness detectors.

Customized fixtures: Specially designed and manufactured according to the shape, size, and interface position of the battery pack. The function of the fixture is to seal and fix the battery pack on the testing platform, ensuring that gas can only enter and exit through the normal sealing part of the battery pack during the testing process, and will not leak from other non testing areas. For example, the fixture will be tightly attached to the outer shell of the battery pack, and its various interfaces will be sealed to ensure that the gas can accurately act on the sealing parts that need to be detected.

Testing platform: provides stable support and operating environment for the entire testing process. It is connected to the airtightness detector and can receive control signals from the detector to perform operation steps such as inflation, voltage stabilization, testing, and deflation. At the same time, the testing platform also has data acquisition and transmission functions, which transmit real-time data such as pressure and time during the testing process to the airtightness detector for analysis and processing.

4、 One stop solution

The airtightness detector plays a core role in the airtightness testing of battery packs.

1. High precision pressure sensor: This detector is equipped with a high-precision pressure sensor that can measure small changes in the internal pressure of the battery pack, with a measurement accuracy of up to 0.1Pa or even higher. During the testing process, both the increase in pressure during inflation and the fluctuations in pressure during stabilization and testing phases can be accurately captured, providing a reliable data basis for calculating leakage values.

2. Intelligent control system: Equipped with intelligent control algorithms, it can automatically control the inflation, stabilization, testing, and deflation operations of the testing platform according to preset detection requirements. For example, during the inflation phase, it can control the gas flow rate to ensure a stable increase in the internal pressure of the battery pack to 20kPa within 60 seconds; During the stabilization phase, real-time monitoring of pressure changes and fine-tuning can be carried out to ensure pressure stability; During the testing phase, quickly analyze pressure data to calculate leakage values; During the deflation phase, control the deflation speed and time.

3. Data display and storage: It can intuitively display various data during the detection process, such as pressure values, time, leakage values, etc., making it convenient for operators to understand the detection situation in real time. At the same time, it can also store a large amount of detection data, which is of great significance for quality traceability, production process optimization, and other aspects. For example, if a batch of battery packs has a high number of non-conforming products, possible causes can be identified by analyzing stored testing data, such as raw material issues, production process adjustments, etc.

4. Supporting testing platform and fixtures: perfectly matched with the airtightness detector. The stability and compatibility of the testing platform ensure the smooth progress of the testing process, while the precise customization of the fixtures ensures effective sealing and accurate testing of the battery pack. This one-stop solution greatly improves the efficiency and reliability of battery pack airtightness detection, reducing errors and problems caused by equipment mismatch or complex operation.

The strict requirements for airtightness testing of battery packs, the scientific direct testing method of airtightness testing equipment, and the one-stop solution of supporting facilities jointly provide strong guarantees for the quality and safety of battery packs.

Suzhou Loho Electronic Technology Co., Ltd. specializes in airtightness detectors, airtightness detectors, leak detectors, airtightness leak detectors, airtightness testers and other equipment. They are widely used, have fast detection speed, and are suitable for sealing, waterproofing, airtightness, leakage and other fields. Welcome to inquire by phone: 189-1262-8676