How to detect the quality of lithium battery
Batteries play a vital role in our lives. They are used to store electricity and power various electrical appliances, especially lithium batteries, which are widely used and are often used in some small portable appliances, such as mobile phones. Batteries are consumable materials and are often charged and discharged. No matter how good the battery is, it has a certain lifespan. Moreover, the price of lithium batteries is higher than other batteries. Therefore, try to choose high-quality lithium batteries when purchasing, and the period of use can be longer. So let's learn how to test the quality of lithium batteries together.
Testing methods for the quality of lithium batteries:
1. The fastest inspection method is to test the internal resistance and the maximum discharge current. A lithium battery with good quality has a very small internal resistance and a large maximum discharge current. Using a multimeter with a range of 20A, directly short-circuit the two electrodes of the lithium battery, the current should generally be around 10A, or even higher, and it can be maintained for a period of time. A relatively stable battery is a good battery.
2. Look at the appearance. The fullness of the appearance, such as the general lithium battery of about 2000mAh, is relatively large. The workmanship is more delicate or the packaging is more plump.
3. Look at the hardness. The middle part of the lithium battery can be squeezed lightly or moderately by hand. The hardness is moderate, and there is no soft squeezing feeling, which proves that the lithium battery is a relatively high-quality battery.
4. Look at the weight. Remove the outer packaging to see if the weight of the battery is relatively heavy. If it is heavy, it is a high-quality battery.
5. During the charging process of the lithium battery, if the two poles of the battery do not become hot after continuous discharge for about 10 minutes, it proves that the battery protection board system is perfect. Generally, the quality of lithium batteries with high-quality protection boards is better than that of ordinary lithium batteries.
The main reasons for errors in testing are:
1. The discharge time (actual 266 minutes) is slightly less than the 5 hours stipulated by the national standard, that is, the discharge current is slightly larger, and the test result will be slightly smaller considering the internal resistance of the battery.
2. The accuracy of the constant current source is not enough, which is lower than the requirements of the national standard (within 1% of the current change), which is mainly caused by the temperature change of the transistor.
3. The accuracy of the ammeter is lower than the national standard (should be less than or equal to 0.5)
4. The battery charging method is slightly different from the national standard requirements (the national standard requires that the charging time should not exceed 8 hours), but it meets the maximum capacity conditions of the battery in use.
Based on this, the battery capacity of this personal test is about 1700mAh, which is much lower than the nominal capacity of 3800mAh.
The service life of a good quality lithium battery is about two or three years. The performance of the lithium battery is not durable is that the power consumption is very fast, and the charging time is correspondingly reduced. In order to ensure the long-lasting use of lithium batteries, attention should be paid to the protection of lithium batteries. For example, a new battery needs to be charged for 12 hours for the first three charges to activate the battery. A blind spot is that the mobile phone is completely dead and then recharged. This idea is wrong. In order to protect the lithium battery, try to charge the remaining half of the battery.
