2025 button cell battery

The development process and technical development direction of 2025 button cell battery

Decompose according to customer needs, gradually decompose the design, each process will eventually be converted into file input and output, the following is a detailed description of the product design process.

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 does not short-circuit, the stacking is equivalent to connecting several small electrodes in parallel, and the winding is equivalent to a large 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 batteries with large energy density, while the metal shell has limited internal space, and the general energy density is slightly lower than that of the soft-coated battery.

Because the aluminum battery is protected by the metal shell, the safety will be higher, while the soft-pack battery can only rely on the function of the data itself to pass the safety test, which seems to be more difficult now.

In terms of process difficulty, since the soft-pack battery is a large number of small poles, it has higher requirements for die-cutting equipment, and is prone to self-discharge and partial micro-short circuits. Due to the limitation of internal space, there is less free electrolyte, and the circulation function may be slightly worse.

The wound battery is relatively better, with a surplus, and easy to complete automated processing. In terms of cost, because the winding battery shell welding requirements are high, the cost is slightly higher, and the soft battery does not involve laser welding, the focus is on packaging, and the equipment investment is low.

According to the internal space to calculate the battery of the battery is negative, the diaphragm layer, according to the case of professional behavior, the test data related parameters are based on past experience to conduct experiments to verify the compaction density, information function, function of auxiliary materials (including SbR, CMC verification, PVDF, conductive agent, etc.) based on the development of the platform type, the final technology development must also match the information, and finally derive the control method and process flow chart.

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 a corresponding detection specification, 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 positive electrochemical use, and it can only be repaired based on the existing relevant experience data.

However, the increase of Co ratio will lead to the decrease of battery parameters a and c, and the increase of c/a will lead to the decrease of capacity.

However, too high manganese content will reduce the capacity of the battery, easily produce spinel phase, and destroy the layered structure of the battery.

However, if the Ni content is too high, it will cause mixed discharge effect with Li+, resulting in the deterioration of cycle function and multiplier function. If the pH value of high nickel battery is too high, it will affect the actual use.

With the increase of nickel content, the battery capacity increases, but the thermal stability of the battery gradually decreases. Mn can play a role in stabilizing the structure, while Ni cannot. With the increase of temperature,

The positive electrode Ni transfers to the Li layer through the tetrahedral position in the delithium state, resulting in structural collapse and thermal stability problems.

The structure of the battery changes from layered salt to spinel, and then to rock salt. Each change is aerobic release, which accelerates the heat loss of the battery.

Most battery manufacturers do not process precursors themselves. There are special manufacturers for precursors. The data purchased by the original battery manufacturer from the precursor manufacturer is sintered according to different control conditions, and the data functions obtained are also different.

NCA produces serious gas during the charge and discharge process, which causes the battery to bulge and deform, and reduces the cycle and storage life, posing a safety hazard to the battery. Therefore, NCA's positive electrode data is generally used to manufacture 18650 cylindrical batteries.

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