In the lithium battery electrode sheet rolling process, the -10℃ cooling temperature control of the low-temperature chiller is a crucial step, which directly affects the compaction density, thickness consistency of the electrode sheet, and the final electrochemical performance of the battery.

I. The Role of Low-temperature Chillers in the Rolling Process of Lithium Battery Electrode Sheets

In the rolling process of lithium battery electrode sheets, the control of cooling water temperature is of vital importance. According to the cold pressing temperature, it is determined "based on the cooling water temperature provided by the user", which means that the temperature of the cooling water directly affects the final forming effect of the electrode sheet. For instance, as mentioned in and, as the rolling temperature increases, the thickness deviation of the electrode sheet gradually decreases and the thickness consistency improves. This indicates that by controlling the temperature of the cooling water, precise regulation of the electrode sheet processing process can be achieved.

Specific parameters of the cooling equipment are provided. Among them, the cooling equipment of models such as CFA302, CFA611 and CFW611 can offer a temperature control range from -10℃ to 60℃ or 80℃, and have a temperature regulation accuracy of ±0.1℃. These devices are widely used in industrial scenarios where precise temperature control is required, including the rolling process of lithium battery electrode sheets.

Ii. The Influence of -10℃ cooling Temperature on the Performance of Electrode Sheets

Although most studies have focused on the improvement of electrode sheet performance by hot rolling (such as 80 to 120℃), low-temperature cooling also plays a significant role in certain aspects. For instance, as mentioned in the text, when lithium-ion battery packs operate at -10℃, phase change materials (PCM) with low thermal conductivity can cause significant temperature differences within the battery pack (>12℃), while composite materials using expanded graphite can effectively improve temperature uniformity. This indicates that in low-temperature environments, the performance of the cooling system is crucial to the thermal management of the battery.

In addition, in the mentioned household energy storage battery low-temperature cold start system, through the cooperation of PTC resistance heaters and supercapacitors, rapid start-up can be achieved within the temperature range of -40℃ to 0℃. Although these technologies are mainly applied in the start-up stage of batteries, their principles are similar to the low-temperature control in the lithium battery electrode sheet rolling process, that is, to ensure the stability of material performance through precise temperature control.

Iii. The combination of -10℃ cooling temperature and electrode sheet rolling process

In the rolling process of lithium battery electrode sheets, cold rolling and hot rolling are two main processing methods. Cold rolling is usually carried out at room temperature, while hot rolling is performed within a temperature range of 80 to 120 degrees Celsius. However, it is pointed out that compared with hot rolling, cold rolling has advantages such as reducing the rebound of the electrode sheet, lowering the rolling force, and enhancing the adhesion between the coating material and the current collector. Therefore, although hot rolling performs better in enhancing the performance of electrode sheets, cold rolling still plays an irreplaceable role under certain specific conditions, such as in low-temperature environments.

For instance, it is mentioned that the temperature fluctuation of the cooling water in the coating oven should be controlled within ±0.05℃ to ensure the uniformity of the electrode material thickness. This indicates that even in a low-temperature environment, a high-precision cooling system is required to maintain the processing quality of the electrode sheet. Therefore, a cooling temperature control of -10℃ may be necessary in some cases, especially in scenarios where it is necessary to avoid overheating or deformation of the material.

Iv. Summary

The -10℃ cooling temperature control of low-temperature chillers in the lithium battery electrode sheet rolling process is mainly reflected in the following aspects:

1. Temperature control accuracy: Through high-precision cooling equipment (such as CFA302, CFA611, etc.), a temperature control of ±0.1℃ can be achieved to ensure the stability of the electrode sheet during the processing.

2. Optimization of electrode sheet performance: Although hot rolling performs better in enhancing the performance of electrode sheets, low-temperature cooling still plays a significant role under certain specific conditions, such as preventing material overheating or deformation.

3. Battery Thermal Management: In low-temperature environments, the performance of the cooling system is crucial for battery thermal management, especially in scenarios where rapid startup or maintenance of battery performance is required.

Therefore, a cooling temperature of -10℃ is an important technical parameter in the lithium battery electrode sheet rolling process. It not only affects the processing quality of the electrode sheet but also relates to the final performance and lifespan of the battery.