Analysis on the precautions of lithium iron phosphate battery packaging

Preventive measures are assembled. The external dimensions of the 1.48V/12Ah lithium iron phosphate battery module are smaller than the ordinary T-type 48V and 12Ah lead-acid battery boxes. Its height is 33cMm and can be directly installed. In order to prevent the battery components from moving up and down in the box, the voids in the box should be filled with foam. Since the top and bottom spaces of the battery module are small, it is better to pad with a good elastic closed-cell rubber-plastic board to prevent the loss of elasticity. Due to the large force, the battery will be damaged. If the bottom of the battery box is not flat, add a layer of hard insulating board here. Facts have proved that if the bottom of the battery is filled with polystyrene foam board, the elasticity of the polystyrene foam board will disappear quickly, and it will not be able to play the role of damping. 2. The charge and discharge control circuit board of the battery module is usually placed on the upper side of the battery pack, and the back (with solder joints) is usually covered with a layer of paper insulating material. For reliability, it is best to coat a thin phenolic plate of the same size on the insulating layer, and then fix it on the battery pack with a self-adhesive tape. 3. In order to prevent the battery package from being soaked by rainwater (especially for charging and laying the control board), the battery package should be covered with several layers of plastic bags of appropriate size. Since the originally designed T box is used for lead-acid batteries, there is a gap in the middle, and the waterproof performance is not good. In order to prevent rainwater from entering the battery package along the battery leads, all the leads of the battery package must first go down to the bottom of the battery pack, and then connect upwards to the charging and discharging sockets. If the lead length is not enough, it should be extended appropriately, but the connection point must be welded, and the outside must be strictly insulated. Short circuit between lines. In addition, the core cross-sectional area of u200bu200bthe lead extension should not be lower than the original lead on the battery package. When soldering fillers and sockets, in order to prevent short circuits between lines, one solder joint must be completed, and then the other end of the insulating sleeve and the other solder joint must be stripped. The connection of each lead must also accurately correspond to the electrode on the socket. The assembled battery can directly replace the original lead-acid battery. There is no need to worry about the discharge voltage of the lithium iron phosphate battery being too high, and it does not meet the requirements of electric vehicles. In fact, the maximum voltage of a 48-volt lead-acid battery is 58.8v, while the maximum voltage of a lithium iron phosphate battery is only 58.4v. The only disadvantage of switching from a lead-acid battery to a lithium iron phosphate battery is that the original vehicle power indicator has lost its reference value, which is inconvenient to use. This is because the discharge of a lead-acid battery is a diagonal line, while the discharge curve of a lithium iron phosphate battery is basically flat. Once the discharge is close to the end and the voltage drops suddenly, the battery will immediately enter the protection state and the discharge will stop immediately. Different from the lead-acid battery, the battery can continue to discharge for a period of time at a lower voltage after the under-voltage warning light is on. Therefore, for ease of use, it is best to install an odometer on the car so that it can be done during unloading. In practical applications, it is found that a lithium iron phosphate battery with the same capacity is not longer than a lead-acid battery. Estimate and virtual standard for battery capacity or charger. Take the lithium iron phosphate battery module composed of all A products purchased by the author as an example, with a 2.5a special charger as a gift for charging, the charging time is 4 hours and 47 minutes. The battery capacity is only 11.7ah, and the electrochemical conversion efficiency is 100%, not to mention that the electrochemical conversion efficiency cannot reach 100%. In addition, according to the manufacturer’s recommendations, the battery should not be fully charged multiple times before use. This will neither increase the capacity of the battery, nor will it provide any other benefits. Compared with lead-acid batteries, its biggest advantage is: light weight, only 1/5 of lead-acid batteries; long service life, the capacity of the battery charged and discharged in 2000 reached 60% of the original; after the waste is discharged, it is non-toxic and non-polluting. surroundings. It should be pointed out that low temperature has a great influence on the discharge capacity of lithium iron phosphate batteries. It is 72% of normal temperature at 5°C, 66.4% of normal temperature at -10°C, and only 50% of normal temperature at -20°C. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Analysis of the best charging method for Ni-MH rechargeable batteries and lithium batteries