Causes for the inconsistency of cell parameters of lithium batteries

　　1. The inconsistency of lithium battery cell parameters in the process of use is a process that needs to be accumulated continuously. The longer the time, the greater the difference between the parameters of each lithium power lithium ion battery cell. The reason is that the inconsistencies of cell parameters of lithium-ion battery are gradually amplified due to the influence of environmental factors during the use of lithium-ion battery modules, which leads to the accelerated decay of cell performance of some lithium-ion batteries, and finally leads to the end of the life of lithium-ion battery modules. Factors affecting the inconsistency of cell parameters of lithium-ion batteries are as follows:

　　(1) In the manufacturing process of lithium power lithium ion battery cell, due to the instability of manufacturing technology processing level, material accuracy and purity, the performance parameters of the final product are inconsistent. Using different batches of anode, anode and electrolyte processing of lithium power lithium ion battery cell, generally can not be mixed. Even if in the process of sorting the parameters of lithium power lithium-ion battery batteries very consistent, there is no guarantee that use in the future for a period of time after lithium power state of batteries, lithium-ion batteries and therefore the current solution is heavily used different batches of the anode, cathode and electrolyte processing mixed lithium power lithium-ion battery batteries. Consistency is affected by many aspects, such as processing procedure

　　Power lithium ion battery (2) lithium batteries, processing is more complex, in the process of the whole processing, the consistency of each working procedure is very important, but the hardest thing to ensure consistency is coating process, coating thickness and average sexual activity as well as the material is not easy to tightly controls the mechanical method, power lithium ion battery is lithium batteries, differences in the process. Differences in the manufacturing process can only be made up as best as possible in the sorting process. In the process of lithium power lithium ion battery cell processing, even if the strict control of ingredients, slurry, coating, cutting, rolling and other processes, only reduce the standard deviation between batch products, but can not eliminate the inconsistency.

　　2. Factors that lead to the inconsistent parameters of the electric module of lithium-ion battery The critical structure of the lithium-ion battery cell includes a positive electrode, a positive fluid collector, a negative electrode, a negative fluid collector, a diaphragm and an electrolyte. The inconsistent performance of lithium-ion battery cells can be traced back to these components. The inconsistency of Li-power Li-ion battery cell will inevitably be transmitted to Li-power Li-ion battery module, and the urgency of Li-power Li-ion battery cell sorting will be reflected in the molded Li-power Li-ion battery module. Single lithium power lithium ion battery cell through welding, clamping, series and parallel, connected together to form a lithium power lithium ion battery module. In this processing process, the process inconsistency will inevitably lead to the inconsistency between the modules and modules of the lithium-ion battery. The most intuitive representation is the inconsistency of the internal resistance of the modules of the lithium-ion battery.

　　(1) In the process of module composition of lithium power lithium ion battery, the inconsistency of welding process is very easy to cause the difference of welding resistance. The order of magnitude of the internal resistance of lithium-powered lithium-ion battery cell is several or ten milliohms. It is unacceptable for the modules of lithium-powered lithium-ion battery to have slight inconsistency of welding resistance in the welding process.

　　(2) It is used for copper bars or high-voltage wires connected inside and between modules of lithium power lithium ion battery. Its own size, connection mode and surface solution will also affect the consistency of lithium power lithium ion battery module. It is important to focus on the internal resistance of lithium power lithium ion battery module at present.

　　(3) Different connection modes (screw connection, crimping or welding) of lithium-ion battery modules have different effects on the consistency of lithium-ion battery modules in use. In addition to the production process, we should also consider the influence of connection resistance. The welding connection point, if the surface solution is not done well, there is oxidative corrosion, its resistance will naturally increase. The resistance of solder joints without corrosion will be different from that of solder joints with corrosion.

　　3, lead to lithium power lithium ion battery power module in use factors affecting parameters are inconsistent in lithium power lithium ion battery module after put into use, lithium power lithium ion battery module in every single lithium power lithium-ion battery batteries parameters by the electrolyte density, temperature and ventilation, self-discharge according influence degree and the charging and discharging process. Due to the different positions of Li-power Li-ion battery cells in the Li-power Li-ion battery module, the single Li-power Li-ion battery cell wrapped in the center of the Li-power Li-ion battery module and the single Li-power Li-ion battery cell in the outermost layer of the Li-power Li-ion battery module have great differences in heat dissipation conditions. Before the thermal equilibrium is reached, the temperature conditions of the cell of different single lithium-ion batteries are different.

　　(1) If the lithium-powered lithium-ion battery pack is installed in different positions, the impact of different ambient temperatures on the consistency of the lithium-powered lithium-ion battery module will be different. Due to the different distance from external environment and heat source conditions, the temperature conditions of lithium-powered lithium-ion battery modules at different positions in the lithium-powered lithium-ion battery pack will be different.

　　(2) The position of the collector copper bar of the lithium power lithium ion battery cell phase is different, which will cause the different heat dissipation conditions between each other, resulting in the inconsistency of the thermal environment temperature of the lithium power lithium ion battery cell.

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