How to judge the composition quality of li ion 18650 battery pack?

　　Connectivity: If a li ion 18650 battery pack pack with poor connectivity has an insulation board, its volume will be the smallest according to the barrel shape principle, resulting in the entire battery pack being damaged due to a certain lithium cell. Because of this, it can neither fully release electromagnetic energy nor fully absorb electromagnetic energy. It will be used for a long time and its service life will be shortened. If the explosion-proof plate is not used, the lithium battery pack will not only cause volume damage, but also cause safety hazards such as overheating and explosion.

　　The inspection method is: connect the lithium cells that need to be inspected in series, and 4 or 6 lithium cells form 1C charging and 3C charging and discharging. During the charging process, observe the increase and decrease in the voltage of the lithium cells.

　　Lithium battery life rate: Because li ion 18650 battery pack lithium battery packs are common in power lithium batteries, they consume a lot of power. Therefore, it is stipulated that the lithium battery life rate of lithium battery packs cannot be less than 2% per month. Therefore, the above is consistent Safety regulations are indispensable. After the consistency test reaches the standard, the test standard for the lithium battery life rate is: after charging the rechargeable battery with the same volume, let it sit for a month, and then measure its capacitor value.

　　High rate: A lithium battery pack that can withstand high-rate charging has a strong ability to charge quickly. For li ion 18650 battery pack packs, it must be able to charge quickly to meet its requirements for power lithium batteries. The polymer battery core inspection method is: according to the standards provided by the lithium battery manufacturer, the polymer battery core is inspected. If serious problems such as obvious heating occur during the charging process, the battery quality is poor. Generally speaking, power lithium batteries should be able to meet safety requirements such as 3C battery charging and 30C charging and discharging.

　　Long-term use: Under normal circumstances, after 1C charge and discharge for 2,000 times, the capacity of the li ion 18650 battery pack pack is still 85%, and the capacity is 80% after 3,000 times. Because the technical strength, raw materials, processing techniques, etc. of each manufacturer are different, the specifications formulated are of course also different. In theory, the inspection method is based on the data provided by the manufacturer. At present, whether the data provided by the manufacturer is true or not depends only on the impact of the brand, and this depends on which brand consumers believe in.

　　How to quickly distinguish the quality of new and old li ion 18650 battery pack cells?

　　Use a digital multimeter with a higher AC voltage than the rated current of the charged battery for testing. Use DC10V and DC2V gears to test the characteristics of the 9V battery.

　　After selecting the gear according to the rated current of the lithium battery, use a DC ammeter to connect the positive and negative stages of the rechargeable battery. If the experimental working voltage is greater than or equal to the allowable rated current of the rechargeable battery. When the battery is intact and the test voltage is less than 10% of the rated current, the battery can be used to charge and discharge relatively small household appliances. Such as: quartz clocks, controllers and other electronic products. When the experimental working voltage is less than 20% of the rated current, the rechargeable battery has no practical value.

　　It should be noted that the working voltage of rechargeable batteries is generally 15%-25% lower than similar rechargeable batteries. For example, the working voltage of 5# rechargeable batteries is rated current.

　　Ways to check the quality of lithium batteries:

　　The faster way to check is to check the internal resistance and maximum charge and discharge current. High-quality lithium batteries have very small internal resistance and very large maximum charge and discharge current. Use a 20A digital multimeter to connect two levels of lithium battery directly. The current should generally be around 10A, or even higher, and can be maintained for a period of time. A relatively stable battery is a good battery.

　　Looking at the appearance, the design is full, and the capacity is relatively large for a typical lithium battery of about 2000 mAh. The processing technology is more detailed or the packaging looks plumper.

　　Look at the strength. You can gently pinch or pinch the middle part of the lithium battery with your hands. If the strength is moderate and there is no soft squeeze feeling, it proves that the lithium battery cell is a good lithium battery cell.

　　Pay close attention to the quantity, and check whether the battery is heavy in the packaging box. If it is heavy, it is a high-quality lithium battery.

　　During the charging period of the lithium battery pack, continue charging and discharging for about ten minutes. If both sides of the battery are not hot, it proves that the battery protection board system is sound. Generally, the quality of lithium batteries with high-quality lithium battery protection boards is better than ordinary ones. Lithium battery.

　　The above is to quickly find out whether a single rechargeable lithium battery is good or bad. Lithium batteries have a certain service life, and the price of lithium batteries is higher than other rechargeable batteries. Therefore, when purchasing, try to choose a cost-effective lithium battery so that it can be used for a long time. long.

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