Reasons for short circuit of polymer lithium battery and repair methods

Reasons for short-circuit of polymer lithium battery and repair methods Reasons for short-circuit of polymer lithium battery and correction methods. With its unparalleled advantages, polymer lithium batteries have been marketed internationally in more and more application fields. Together with polymer lithium batteries, they are high-risk commodities. Battery safety has always been an important issue in the industrialization of lithium batteries. The author tells you the reason for the short circuit of polymer lithium battery and the corrective method, so that you can use lithium battery more safely. Causes of short circuit of polymer lithium battery When the polymer lithium battery is overcharged or overdischarged during charging, the mismatch between the charger and the mobile power supply can easily constitute the battery overcharge, and the swelling of the polymer lithium battery may increase. When the battery is charged and discharged, the battery continues to heat up, the gas expands during the activation process, the internal pressure of the battery increases, and the pressure reaches a certain level. There is also a maintenance problem of the sealing lip. The sealing edge aluminum-plastic composite film packaging material sandwich is made of pure aluminum and has excellent electrical conductivity. When using it, a solid insulation isolation method must be used to prevent it from forming a short circuit with external components. Cell corrosion gas. The short-circuit method of polymer lithium battery is that the anode and cathode of the collected liquid break the electrolyte gap during the process of filming and soft packaging of the battery, and the short circuit is formed by physical contact, which is called physical short circuit; the other is the battery charge and discharge cycle, the electrode Part of the electronic conduction caused by the chemical change between the activity data and the electrolyte gap data is called a chemical short circuit. Some of the appearances of lithium batteries caused by these two kinds of short circuits are the same, such as: the formation curve of the battery is abnormal, the battery self-discharge, the battery's blow-discharge capacity and charge-discharge efficiency are not advanced. However, due to the different short-circuit mechanisms of the two, the impact on polymer lithium batteries is also different. Generally speaking, a chemical short circuit occurs inside the polymer lithium battery, and the various functions of the battery not only perform abnormally, but also with the use of the battery, the various functions of the polymer lithium battery may deteriorate rapidly; physical short circuit, on the other hand, polymerization The active material and electrolyte membrane of the lithium battery have not changed. When the physical short circuit is not serious, the electrochemical reaction core of the polymer lithium battery remains unchanged, because a part of the short-circuit current is contacted and lost through the internal body, making the battery active material The actual current density and process are expected to achieve different intentions and form an error; during storage and use, due to internal circuits, the battery's self-discharge and discharge capacity is small, and the charge and discharge efficiency is low. Assuming that the physical short circuit is very small, it has minimal impact on the use of the measured abnormal polymer lithium battery. When the physical short circuit is severe, most of the current is lost inside the battery and the battery cannot be charged; assuming that this phenomenon occurs after it is formed, the battery's electrochemical reaction mechanism is changed due to the short circuit and overheating, and the battery may blow out. Short-circuit correction method of polymer lithium battery 1. Reduce the charging current, lower the charging voltage, and check whether the safety valve body is blocked. 2. Regularly charge and discharge. Many of the float charge and discharge voltages of the polymer lithium battery in the power system have been adjusted to the rated voltage at the factory, and the discharge current increases with the increase of the load. The storage of polymer lithium batteries will lose part of their capacity due to self-discharge. Therefore, after the equipment is put into use, before the polymer lithium battery is put into use, the remaining capacity of the battery should be determined according to the battery's open circuit voltage, and then different methods should be selected to make up for the charging of the polymer lithium battery. Lithium polymer battery equipment and tools should be insulated. The wiring should be connected to electrical appliances other than the battery. There is no short circuit after inspection. Finally, it is connected to the polymer lithium battery. The wiring standard should be excellent insulation to prevent compression stack division. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.