(1) In the manufacturing process of lithium power lithium ion battery cells, due to the instability of the processing level of manufacturing technology, material accuracy and purity, the final product performance parameters are inconsistent. Lithium power lithium ion battery cells processed with different batches of positive and negative electrodes and electrolytes generally cannot 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 factors such as machining process
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 in the sorting process. In the process of lithium-ion battery cell processing, even if the batching, live pulp, coating, cutting, rolling and other processes are strictly controlled, the standard deviation between batch products can only be reduced, but the inconsistency can not be eliminated.
(1) In the process of forming lithium power lithium ion battery modules, inconsistent welding processes are very easy to cause differences in welding resistance. The order of magnitude of internal resistance of lithium power lithium ion battery cell is several or tens of milliohms. Even slight inconsistencies in welding resistance during welding process are unacceptable for lithium power lithium ion battery modules.
(2) the copper bar or high voltage wire used for connecting the lithium power lithium ion battery module inside and between the modules, its own size, connection mode and surface solution will also affect the consistency of lithium power lithium ion battery module, which is critical to the internal resistance of lithium power lithium ion battery module.
(3) Lithium power lithium ion battery modules with different connection modes (screw connection, crimping or welding) have different influences on the consistency of lithium power lithium ion battery modules in use. In addition to considering the production of technology, but also consider the impact of the connection resistance. The use of welded joints, if the surface solution is not good, there is oxidation corrosion, the 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. Because the position of lithium power lithium ion battery cell in lithium power lithium ion battery module is not the same, the single lithium power lithium ion battery cell is wrapped in the center of lithium power lithium ion battery module and the single lithium power lithium ion battery cell in the outermost layer of lithium power lithium ion battery module, the heat dissipation condition is very different. Before reaching the thermal equilibrium, the temperature condition of the cell of different monomer lithium power lithium ion battery is different.
(1) If lithium power lithium ion battery pack is installed in different positions, different ambient temperatures will have different influences on the consistency of lithium power lithium ion battery module. Due to the different distance from external environment and heat source, the temperature conditions of lithium power lithium ion battery modules in different positions of lithium power lithium ion battery pack will be different.
(2) The different position of the core phase of the lithium power lithium ion battery will cause the different heat dissipation conditions between each other, resulting in the inconsistency of the thermal environment temperature of the battery core of the lithium power lithium ion battery.
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