How does lithium battery pack manufacturer test battery quality

How does the manufacturer of lithium battery pack test the battery quality? What does the manufacturer test the content of lithium battery pack? In recent years, the test quality of battery pack has become the primary topic of manufacturers. Lithium battery pack detection is the work advocated by modern green production concept, and is the need of the whole industry chain. Manufacturers often use lithium battery testing services to enhance consumer acceptance of products.
What do manufacturers test for lithium battery packs?
The key contents for manufacturers to test lithium battery pack include: capacitance test, loading test, charge discharge test, short circuit fault test, internal resistance test, working voltage test, resistor test, current maintenance test, set machine test, etc.
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1、 Divided volume experiment: divided volume experiment is used separately, and 1C is used for standard experiment, general experiment and rapid experiment. The activity of lithium battery pack is mainly to better understand the volume and characteristics of the battery pack.
2、 Charge and discharge inspection: the purpose of battery charge and discharge inspection is to distinguish whether the charging power circuit of lithium battery package is normal. There are certain regulations for the detection of the working voltage and current of battery charging.
3、 Short circuit fault test: the key of short circuit fault test is to distinguish whether the over-current protection function of lithium battery pack is normal. Generally speaking, the test standard is the application of full intelligent detector. When testing, special attention should be paid to the short circuit fault time should be less than 3 seconds. It is not allowed to use the multimeter current level or working voltage level to carry out short circuit fault detection.
4、 Internal resistance test: the internal resistance test is the index value to distinguish the power consumption of lithium battery pack itself. When the internal resistance is too large, it will harm the charge and discharge, and even cause no charge and discharge.
5、 Over current protection experiment: when the lithium battery pack is fully charged, the variable resistance is used to adjust the charge and discharge current, so that the current flow is slowly expanded. When the charge discharge current exceeds a certain working voltage, the current of the charge discharge control circuit will be cut off and the current will be zero. The amount of current before the record is cut off is the amount of over-current protection current.
Lithium battery safety testing items are divided into the following four categories
1. Electrical test: overcharge, overdischarge, external short circuit, forced discharge, etc.
2. Mechanical test: extrusion, needling, impact, vibration, drop, etc.
3. Thermal test: high and low temperature cycle, combustion, microwave heating, etc.
4. Environment simulation: high altitude low pressure simulation, salt spray test, etc.
Conclusion: in the lithium battery industry, many lithium battery manufacturers have their own battery production technology and level gap. The detection and testing of lithium battery pack can eliminate the potential safety hazards at the first time, and provide better after-sales, maintenance and testing services for consumers in the market.