Five common problems in the use of lithium batteries

Five common problems of lithium batteries The most important problems that should be paid attention to during the use of lithium batteries are: overcharge, overdischarge, overcurrent, unbalanced charging, and the impact of ambient temperature on battery life. These problems can cause serious damage to the battery and even cause the battery to explode. Therefore, lithium batteries must prevent and solve these problems during use. I am overcharged. When the voltage of a single cell of a lithium battery exceeds a specified value, the electrolyte in the battery will decompose. The decomposition of the electrolyte will increase the temperature of the battery and reduce the service life of the battery, and the serious decomposition of the gas will cause the battery to explode. Therefore, during the use and development of lithium batteries, great attention must be paid to charging issues to avoid potential safety hazards and waste of resources. Battery protection facilities should be installed when charging. When the voltage exceeds the battery value, the set protection circuit should automatically cut off the charging circuit. When the voltage is restored to the range that the battery can withstand, the protection circuit automatically stops working and charges normally. Different lithium batteries are made of different materials, so they can withstand different voltages. When protecting household circuits, they should be placed according to specific battery materials. In addition, when building the protection circuit, you should also pay attention to the error judgment and operation caused by noise. When setting the protection circuit, the overcharge protection delay should be set, that is, when the voltage exceeds the battery one-press time, the protection of the protection circuit is triggered. Second, the problem of excessive discharge. The problem of over-discharge can also lead to a shortened life of lithium batteries. Special attention should be paid to the fact that the damage caused by the over-discharge of the lithium battery is irreversible, that is, once the damage caused by the over-discharge of the battery occurs, no measures can restore the battery to a healthy state. In order to properly protect the lithium battery, it is necessary to prevent over-discharge and install a discharge protection device. When the voltage of the lithium battery is lower than the discharge voltage monitoring point, the discharge protection device can automatically play its purpose and terminate the battery discharge process. Over-current, short-circuit and other problems The problem of over-current is that excessive current during discharge will also cause damage to the battery, and this damage is irreversible. Lithium batteries have a certain limit on the discharge current. When the discharge current exceeds this critical value, the service life of the battery will be affected. Over-current protection also needs to set a certain time delay, at least generally a few hundred milliseconds microseconds. This is also to prevent the wrong operation process on the battery, but the delay time is too long, and the effect of over-current protection is ineffective. Cause damage to the battery, so the delay time has more accurate space. The overcurrent problem is a short circuit problem with special performance. It is often seen in daily life. When the power plug is inserted into a high-power electrical appliance, it is easy to short-circuit the I-type circuit, which is caused by the damage caused by the large current discharge. Unlike the over-current problem, the short-circuit problem has almost no time delay in protecting the circuit. On the contrary, the circuit should be cut off immediately after a short circuit problem occurs, otherwise it will cause serious damage to the battery and electrical appliances. Fourth, the battery balance power lithium battery sometimes requires several, dozens or even hundreds of battery lines, these batteries may be unbalanced in use. This is because the battery processing has to go through a lot of procedures. Although the final process is very strict testing, after all, there are various differences in the processing process. After a period of use, these differences will be Began to show up. In this case, if you have a battery pack composed of multiple batteries, the capacity of the entire battery depends on the capacity of the battery with the lowest capacity. This is the bucket theory. Faced with such problems, a corresponding protection line should be set on the battery to draw excess power from the higher voltage battery, so that the battery can be more balanced. Commonly used equalization methods include energy storage equalization and resistance equalization. 5. Ambient temperature uses rechargeable batteries. The impact of ambient temperature on battery life is often ignored. The specification of the battery indicates the temperature range of the battery, but in a high temperature or low temperature environment, the battery self-discharge rate will be higher, especially at high temperatures. It will greatly reduce the service life of the battery, so before buying, you must communicate with the engineer, given the use of the equipment or the use of the environment, this ability can make the battery performance better. The laptop prompts you to replace the battery. The solution: The Dell Inspiron N4010 notebook has been used for less than a week, and the new machine was detected by Master Lu as soon as the new machine was opened. The battery loss was 9%. After two days, it became a loss of 12%. . After confirmation, both the machine and the battery can be used normally, and the battery can be used for more than 2 hours. After replacing other test tools, the problem still exists. Solution: This problem has been tested on multiple machines by dellCIS engineers, and 99% of the problems can be successfully solved by slow charging and discharging. Take a machine with a battery loss of 18.5% as an example (as shown in Figure 1). When the battery is fully charged, the machine is used normally until the battery power drops below 10%. When the system prompts to charge, the computer restarts. Next, do not repeat the power-on action until the LCD screen is not on, press the power button, and then fully charge the battery in the off state. After one operation, the battery loss was reduced to 15.89% (as shown in Figure 2), and after multiple operations, the battery loss was reduced to at least 0.9%. 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