Decompose according to customer needs and gradually decompose the design. Each process will eventually be transformed into file input and output. The product design process is described in detail below.
In the most basic design, the negative electrode is 1-2mm wider than the positive electrode, and the diaphragm is 2-4mm wider than the negative electrode. In order to ensure that the uneven battery is not short-circuited, the stack is equivalent to several small electrodes in parallel, and the winding is equivalent to a large electric pole;
Because of the quality of the light aluminum plastic film and the high utilization of the internal space, the soft-coated battery is suitable for the development of high battery energy density, while the internal space of the metal casing is limited, and the general energy density is slightly lower than that of the soft-coated battery.
Because aluminum batteries are protected by a metal casing, they are more secure, while flexible packaging batteries can only rely on the function of the data itself to pass the safety test, which now seems more difficult.
In terms of process difficulty, since the soft pack battery has a large number of small electrodes, it has high requirements for die-cutting equipment, and is prone to self-discharge and partial micro-short circuits. Due to internal space limitations, there is less free electrolyte and the circulation function may be slightly worse.
The wound battery is relatively better, has a surplus, and is easy to complete automated production. In terms of cost, because the welding of the winding battery shell requires high, the cost is slightly higher, and the soft battery does not involve laser welding. The focus is on packaging and low equipment investment.
According to the internal space to calculate the battery, the battery is negative, the diaphragm layer, according to the occupational behavior, the test data-related parameters are based on past experience to verify the compaction density, information function, and auxiliary materials of the function (including The type of platform developed on the basis of the verification of SBR, CMC, PVDF, conductive agent, etc., the final technology development should also match the information, and finally the control method and process flow chart can be obtained.
Nowadays, in order to shorten the time, manufacturers combine experimental verification and process development, but this is often risky. After all, the data system itself is carried out with the development of skills.
Each function of each data has corresponding testing specifications, and some functional indicators of the positive and negative electrodes are directly related to the functional indicators of the battery. However, there is currently no suitable model to simulate the use of forward electrochemistry, and it can only be repaired based on existing relevant empirical data.
However, the increase in the Co ratio will result in a decrease in battery parameters a and c, and the increase in c/a will result in a decrease in capacity.
However, an excessively high manganese content will reduce the capacity of the data map, easily appear spinel phase, and destroy the layered structure of the data.
However, if the Ni content is too high, a mixed discharge effect will occur with Li+, resulting in deterioration of the cycle function and multiplier function. If the pH value of the high nickel data is too high, it will affect the actual use.
As the nickel content increases, the data capacity increases, but the thermal stability of the data gradually decreases. Mn can serve to stabilize the structure, while Ni cannot. As the temperature rises,
The positive electrode Ni transfers to the Li layer through the tetrahedral position in the delithium state, causing structural collapse and thermal stability problems.
The data structure changes from layered salt to spinel, and continuously to rock salt. Every change is aerobic release, which accelerates the heat loss of data.
Regarding most data manufacturers that do not produce precursors themselves, there are special manufacturers for precursors. The data purchased by the original data manufacturers from the precursor manufacturers are sintered and the control conditions are different, and the data functions obtained are also different.
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