Can the lithium battery of an electric car be used if it has water?

The vigorous development of the lithium battery industry has accelerated the normalization of lithium batteries for electric bicycles. The implementation of the new national standard has further regulated the market’s rigid standards. Although there is no mandatory requirement, to meet the new national standard, the choice of lithium batteries may be the only electric bicycle. Optional. However, as the application of lithium batteries is increasing, the maintenance problems that follow are becoming more and more obvious. The characteristics of lithium batteries and storage batteries are different, so there are great differences in maintenance methods, use methods, and charging methods. . When using electric bicycles, we will inevitably encounter wading problems or rainy seasons. When the battery and lithium battery are soaked in water, the two batteries are handled in completely different ways. 1) Electric vehicle battery (lead-acid battery) Treatment method after being soaked in water, electric vehicle batteries are not particularly afraid of water, because lead-acid batteries are usually sealed, and short-term wading will not cause internal water to enter, but if the wading position has no electrodes It is necessary to check the voltage of each battery, and if the electrode connection is locked by screws, it needs to be disassembled to clean up the water stains, and the battery of each single group of batteries should be measured separately. Whether the voltage is consistent or not, if it is purely a certain difference, you can choose to use a 12V lead-acid battery charger to fully charge each group of batteries separately to restore the balance of the group of batteries. 2) Handling methods after the lithium battery of electric vehicle enters water. Groups of lithium batteries for electric vehicles generally contain a control and protection circuit to manage the charging and discharging of the battery. After the lithium battery of electric vehicles is slightly flooded, we must first disconnect the input of the lithium battery. For the output circuit, first check and remove the water stains at the location of the BMS protection board, because this is where the entire group of lithium battery circuits are concentrated, first cleaning the location of the protection board can effectively prevent secondary short circuits. If the lithium battery of an electric vehicle is immersed in water and the water is severely flooded, if the waterproofing of the lithium battery cell is not in place and the cell is also immersed in water, we must distinguish the types of batteries. The following are several ways to deal with the batteries 1) For the 18650/21700 cylindrical lithium battery pack for electric vehicles, it is recommended to discard the battery cells directly after being soaked in water, and it is not recommended to use them again. Because the cylindrical lithium batteries are all metal steel shells, a certain amount of pressure is generated inside the lithium battery during charging and discharging. When the pressure reaches a certain value, the pressure will be discharged through the safety valve. The lithium battery after being soaked in water may cause The effectiveness of the safety valve makes the battery work in a dangerous state, which is prone to explosion and fire accidents, and the positive and negative poles of the cylindrical lithium battery are very close. The impurities after entering the water can easily short-circuit the battery and cause continuous failure. Moreover, the nickel sheets of cylindrical battery packs are too widely distributed and not easy to handle cleanly. 2) Polymer soft packs or lithium iron phosphate soft packs and other large soft packs and large monomers. Such batteries can be tried to be repaired. Normally, they are soft. The combination positions of the pack batteries are all in one orientation, which is easy to be handled centrally, and the soft pack lithium battery is very well sealed, so don’t worry, but it’s best to collect the data before repairing, such as the voltage and the voltage of each single string cell. Internal resistance and capacity status. 3) Square hard-packed lithium battery cell combination. The battery of this type of lithium battery cell combination is generally connected to the cell by laser or screw locking, which is more convenient to handle. It is similar to the soft pack lithium battery. Summary: After the electric vehicle battery enters water , The performance of lithium batteries is more delicate than batteries. Any type of lithium battery should be kept away from wading and ingress of water. The damage of the ingress of lithium batteries is huge. Daily use should be avoided as much as possible. Statement: Some pictures and content of articles published on this site are from the Internet, such as If there is any infringement, please contact to delete the previous article: What determines the life of electric vehicle lithium battery