Today to talk about the battery inside #thecellassemblytechnology, in the power battery faction technology discussion, in the end is the choice of cylindrical soft package or square, the controversy has been ongoing, similar technical controversy also appeared in the cell manufacturing feasibility level.
For lithium batteries interrupt the assembly process of the core, there are two different technologies in the competition, that is, #thelaminatedsheet and #windingprocess. These two processes compete with each other in terms of the space utilization of the core, the life of the core, the manufacturing efficiency of the core and the size of the manufacturing investment.
First of all, let's talk about the difference between the two processes. #Windingprocess, is through the control of the speed, tension, size deviation and other elements of the pole piece, to match each other's pole piece diaphragm and tape after the slit according to the size of the rolled into a core, stacking is the pole piece and diaphragm alternately stacked together, and finally complete the multi-layer stacking core of a production process, from the battery form, #softpack and #bladebattery, are designed around the stacking process to produce, while the square shell battery, can the main technical direction of Chinese battery enterprises is based on winding technology, especially #cylindricalbatteries, as a mature product form, has been the use of winding technology, but in the long run, with the progress of stacking technology, a large number of enterprises also began to enter the era of stacking from the original winding process.
Let's first look at the benefits of laminated technology, from the final product of the battery, the battery products made with laminated technology have
1. Higher energy density,
2. More stable internal structure,
3. Higher safety, and longer life.
Let me explain in turn, the reason for the increase in energy density, mainly refers to the internal winding process conditions of the cell, the corner of the winding has curvature, which leads to a lower utilization of the space of the cell.
Then the stacking process, is able to fully utilize the space of the battery, so in the same volume of the cell design, energy density is also higher than the winding some.
Structurally, the laminated sheet is also more stable than wound, first of all because the battery in use, due to the embedding of lithium ions, will make the positive and negative electrode sheet have expansion, wound cells.
Will be in the corner of the winding, another layer of internal stress inconsistency, the core will occur wavy deformation, which leads to
1. Poor interface of the cell
2. Uneven current distribution
That the internal structure of the battery will also become more and more unstable, security is also brought about by the shape of the structure itself, the expansion and contraction of the pole piece, the diaphragm stretching will lead to the deformation of the cell, to ensure that the cell deformation becomes smaller is also a guarantee of the security of the cell.
In the winding process, the bending of the two ends of the pole piece, the coating material will also occur larger bending deformation, the bend is prone to powder, burrs and other problems, the pole piece and diaphragm by tension, will also occur when the wrinkles, uneven problems.
Comparatively speaking, the laminated sheet, due to the uniform force, deformation becomes smaller, safety will also become higher, cycle life is also one of the key performance of the battery.
The number of stacked cells, the shorter the electron transfer distance, the smaller the resistance, so the internal resistance of stacked cells can be reduced, the battery heat production is relatively small, and winding is prone to deformation, expansion and other problems, affecting the decay characteristics of the battery.
Of course the laminated sheet process. It is not without problems, otherwise there will be no technical controversy, its problem is a piece of equipment there is low production efficiency, high investment in equipment, low yield rate and other shortcomings.
First of all, let's talk about the problem of low equipment efficiency, the general power battery winding efficiency of 12 PPM, so that the square winding machine is also within this range, but the traditional C-shaped laminating efficiency, generally only four PPM, here the efficiency is three times worse.
In addition, because the laminating area is also larger than the winding machine, which makes the efficiency further reduced.
That equipment, investment, we see from a single production line, the need for transfer machine, is related to the length of each cell, generally a production line requires ten transfer machine, the need for investment in about 30 million, and the use of laminating process, a production line, the number of laminating machine is also related to the number of pieces of battery, the general need for investment in more than 60 million yuan, coiled battery is relatively easy to slice, so that the pass rate is higher High, each cell as long as the positive and negative electrode once slitting, less difficult, while the slitting of the stacking machine is relatively cumbersome, each cell.
There are dozens of small pieces, easy to produce defective products, therefore, the stacked battery is prone to breakage problems, here to say a very hot blade battery, this innate suitable for stacking, blade battery, the length of 960 mm, the height of 90 mm, using the stacking process to produce blade battery alignment can be controlled within 0.3 mm accuracy, stacking efficiency of 0.3 seconds each P, to summarize Cylindrical square shell, soft package development direction is the choice of different companies
According to their own circumstances, cylindrical due to the standardization of cells, the use of winding process, the manufacturing efficiency of individual cells in improving the use of scenarios in the broadening of the soft package, began to transition to the short blade and long blade, the use of the stacking process, square shell, generally speaking, is to maintain the existing size specifications, you can use the winding process. But the development into a square shell.
After the size of the stacked piece becomes short and long knife battery, will also naturally transition to the stacked piece process, from the perspective of manufacturing efficiency and yield, the greatest potential is the winding of large cylindrical batteries,
This is because around the mature process, and the import of advanced dry electrode process, we can have increased imagination, and Tesla and BMW in a strong push, that the development of faster, in fact, is the stacked piece technology, with BYD, Yiwei lithium energy, honeycomb energy, AVIC lithium, EVE and other Chinese power battery to join, and overseas enterprises such as Samsung, LG, chemical, SK and even Panasonic.
This field due to the promotion of so many battery companies, there is also a lot of imagination, of course, the most stable development or winding process square shell winding is the most capacity, capacity construction is also around this technology
The route forward. Finally, I would like to say is that battery companies around the choice of process to make trade-offs, but the trend, indeed, is becoming clearer and clearer, with the development of technological innovation, power batteries to improve the energy of the era of large-scale manufacturing is that each battery company can not avoid.
Who can do well at this stage, you can find your own foothold in the stage of power batteries become a large-scale standardized products.
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Lithium batteries have become ubiquitous in our daily lives, powering a wide range of devices from smartphones to electric vehicles. Their popularity can be attributed to numerous advantages, but like any technology, they also come with drawbacks.
High Energy Density
Lithium batteries boast an impressive energy density, meaning they can store a large amount of energy in a compact and lightweight form. This characteristic makes them ideal for portable electronic devices where space and weight are critical considerations.
Long Cycle Life
Lithium batteries typically have a longer cycle life compared to other rechargeable batteries. They can undergo hundreds of charge-discharge cycles without significant loss of capacity, contributing to their durability and longevity.
Quick Charging
Lithium batteries support fast charging, allowing users to replenish their devices&#; power quickly. This is especially crucial in today&#;s fast-paced world where individuals rely heavily on electronic gadgets and need a rapid turnaround for their battery charging needs.
Low Self-Discharge Rate
Lithium batteries exhibit a low self-discharge rate, meaning they lose less energy when not in use. This makes them suitable for applications where the device may be idle for extended periods without the need for frequent recharging.
Versatility
Lithium batteries come in various forms, including lithium-ion (Li-ion) and lithium-polymer (Li-Po), offering flexibility to cater to different applications. This versatility has contributed to their adoption in diverse industries.
High Cost
One of the primary drawbacks of lithium batteries is their relatively high production cost. This aspect can make devices and technologies utilizing lithium batteries more expensive, impacting accessibility for some consumers.
Safety Concerns
While lithium batteries are generally safe, they can be prone to overheating and, in rare cases, may catch fire or explode. The incidents are often linked to manufacturing defects, improper use, or external factors such as physical damage.
Limited Resource Availability
Lithium is not an abundant resource, and the demand for lithium batteries has raised concerns about the availability of this crucial element. This has led to exploration of alternative technologies and recycling initiatives to mitigate resource scarcity.
Environmental Impact
The production and disposal of lithium batteries can have environmental implications. Extraction of lithium and other materials for battery production may lead to habitat disruption, and improper disposal can contribute to pollution.
Temperature Sensitivity
Lithium batteries are sensitive to temperature extremes. High temperatures can accelerate their aging process and reduce performance, while low temperatures can hinder their ability to deliver power effectively.
Lithium batteries can be relatively expensive due to a combination of factors:
Raw Material Costs
Lithium batteries rely on materials such as lithium, cobalt, nickel, and other metals. The extraction and processing of these materials can be expensive, and fluctuations in the prices of these raw materials can impact the overall cost of producing lithium batteries.
Manufacturing Process
The manufacturing process for lithium batteries involves precision and sophisticated technology. Creating the electrode materials, assembling the cells, and ensuring quality control all contribute to production costs. The need for specialized equipment and facilities adds to the overall expense.
Quality and Safety Standards
Stringent quality and safety standards are imposed on lithium batteries to ensure they meet regulatory requirements and do not pose safety risks. Compliance with these standards involves additional testing and quality control measures, contributing to the overall cost.
Limited Resource Availability
Lithium is not an abundant resource, and the demand for lithium batteries has increased as electric vehicles and renewable energy storage systems become more prevalent. Limited availability of lithium can contribute to higher prices.
Innovation Costs
Advancements in lithium battery technology often require significant investments in research and innovation. These costs are distributed across the produced units, contributing to the overall expense.
Lithium batteries have revolutionized the way we power our electronic devices, providing a potent combination of high energy density, long cycle life, and quick charging capabilities. However, their advantages are accompanied by challenges such as high cost, safety concerns, and environmental impacts. As technology continues to advance, addressing these drawbacks will be crucial to ensuring the sustainable and widespread use of lithium batteries in the future.
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