The analysis of the advantages of the lithium battery pack lamination process is as follows:

1. Higher energy density

Improved space utilization: The lamination process stacks the positive and negative electrode sheets and the separator layer by layer, allowing the electrode sheets to be designed as a more regular rectangular structure, which can fully utilize the internal space of the battery casing. Compared with the waste of corner space caused by the bending of electrode sheets in the winding process, the lamination process increases the proportion of effective active substances inside the battery. Take the common square battery as an example. The energy density of the laminated process battery can be increased by 5% to 10% compared with the winding process, and it can store more electricity in the same volume.

Flexibility in electrode sheet design: The lamination process has relatively few restrictions on the shape and size of the electrode sheets. Different shapes of electrode sheets can be designed according to the performance requirements of the battery, such as increasing the width or length of the electrode sheets to further increase the filling amount of active substances, thereby enhancing the energy density of the battery.

2. The battery performance is better

Lower internal resistance: The electrode layers of the laminated battery are in closer contact with each other, resulting in shorter and more uniform current conduction paths, effectively reducing the internal resistance of the battery. Reducing internal resistance can decrease the energy loss and heat generation of the battery during charging and discharging, and improve the charging and discharging efficiency of the battery. For instance, when a laminated battery is charged rapidly, its low internal resistance can reduce the temperature rise during the charging process, decrease the performance degradation of the battery caused by high temperatures, and at the same time increase the charging speed.

Longer cycle life: During the charging and discharging process, the expansion and contraction directions of the electrode sheets in the laminated battery are relatively consistent, resulting in a more uniform stress distribution and reducing problems such as deformation, powdering, and active material shedding caused by uneven stress on the electrode sheets. This enables the laminated battery to have better structural stability and slower capacity attenuation during the cycle use process. Generally speaking, the cycle life of laminated batteries can be 10% to 20% longer than that of wound batteries, making them more suitable for applications with high requirements for cycle life, such as energy storage systems and electric vehicles.

Better rate performance: Due to the low internal resistance and uniform current distribution of the laminated battery, the polarization phenomenon inside the battery is relatively small during high-current charging and discharging, enabling it to withstand higher charging and discharging rates. This makes the laminated battery perform well in applications that require rapid charging and discharging, such as the rapid acceleration of electric vehicles and the recovery of braking energy.

3. Higher security

Better thermal stability: The heat generated by the stacked battery during charging and discharging is more evenly distributed, and the risk of local overheating is lower. Moreover, in the lamination process, the contact between the electrode sheet and the separator is closer, and the separator can better play the role of insulation and thermal isolation, effectively preventing the occurrence of internal short circuits and thermal runaway in the battery. In thermal abuse tests, laminated batteries typically exhibit better thermal stability and pose lower safety risks such as fire and explosion.

Strong structural stability: The laminated structure of the electrode sheets in the laminated battery enables it to better disperse stress when subjected to external force impact or compression, reducing the damage to the internal structure of the battery. In contrast, when wound batteries are subjected to external forces, the electrode plates are prone to deformation and displacement, increasing the risk of separator damage and internal short circuits. Therefore, laminated cells have obvious advantages in terms of safety and are more suitable for application scenarios with strict safety requirements, such as aerospace and military industries.

4. The battery design is more flexible

Customized shape and size: The lamination process can flexibly design the shape and size of the battery according to different application requirements and space limitations. Whether it is square, round or irregular-shaped batteries, the lamination process can adapt well. This flexibility enables the battery to be better integrated into various devices, enhancing the space utilization and overall performance of the devices. For instance, in some wearable devices, irregular-shaped batteries need to be adopted to adapt to the special shapes of the devices, and the lamination process can meet such customized requirements.

Convenient capacity and voltage adjustment: By adjusting the number, size and material of the electrode sheets, the lamination process can conveniently adjust the capacity and voltage of the battery. This enables battery manufacturers to quickly develop products of different specifications based on market demands, meeting the needs of various customers. For instance, in the field of electric vehicles, laminated battery packs of different capacities and voltages can be customized based on the vehicle's driving range and power requirements.