Blog

To detect bad 18650 cells is important in high-volume lithium battery production and pack assembly. Singly failing 18650 cells can cause both capacity imbalance and overheating, shorten the life of a whole pack or even represent a risk to safety on a much larger scale. Manually inspecting 18650s is not feasible when thousands need processing every day. For this reason automatic 18650 cell detection and sorting are used in battery factories, energy storage projects, and recycling lines. Focus for automatic detection is on identifying cells which fail electrical, physical, and consistency tests prior to inclusion in a battery pack. Common Types of Bad 18650 Cells Typically bad cells can be low in capacity, or unstable, and may show abnormally high IR. Alternatively they may show voltage deviation, self-discharge issues, or mechanical defects such as dents or swelling, or fail to make proper contact with terminals. Cells from the same batch could produce a wildly different performance if

In the fast expanding power of battery, 21700 cells will be found to play a supporting role across a growing number of applications from electric vehicles (EVs) to energy storage systems. As demand increases for a battery of higher capacity than existing solutions or with greater efficiency, so the sorting and grading of batteries is seen as essential. One of these vital methods is IR (Internal Resistance) grading. Why is IR grading of 21700 cells essential? Internal resistance (IR) is a key property of all lithium-ion batteries including the 21700 cell format. The higher the resistance, the more difficult the current finds it to flow, and the more power is lost in internal heat. A battery’s efficiency, or rather the proportion of its energy that can be reliably extracted, rises and falls with IR, as does the maximum charge and energy capacity at which the battery will both function safely and last long enough to be of practical use. Grading 21700 batteries by IR ensures that they wil

Sorting and testing lithium-ion batteries, especially the popular 21700 form factor, needs to be done quickly and accurately. Used in applications from electric cars to battery storage, the 21700 battery must be sorted electronically to ensure they are defect free and presorted for the best performance. How fast can a 21700 cell sorting machine sort batteries and what factors affect its speed?Machine typeAutomatic 21700 battery sorting machines are faster than semi auto counterpart. Being automatic their sorting action is fully electronic and less time is needed to place the wrong cell in a separate storage bin. Semi-automatic machines are likely just loading cells into the machine.Photoelectric or IR sensor and sorting mechanismThe sorting mechanism itself will affect the speed of the machine; machines using high tech infrared (IR) sensors will quickly identify battery types and defect. This fast detection speeds up sorting by involving fewer idle moments as the machine detects and e

As the demand for lithium-ion batteries continues to rise, so does the need for an effective machine for sorting battery cells. Of the many types of batteries on the market today, the 21700 50E battery cell has become popular for its higher capacity and energy density, making it an ideal cell for electric vehicles (EVs), power tools and storage systems – and the need for sorting them appropriately is a big barrier to companies trying to optimise the performance and longevity of their battery pack. So what is the best machine for 21700 50E battery cell sorting? Key Things To Consider When Choosing The Best Machine Accuracy: It is vital that the sorting machines are able to accurately sort cells based on capacity, voltage and internal resistance. Generally, the more accurate the sensor and sorting mechanism, the better. Speed: Battery sorting machines need to be able to process large volumes of cells very quickly, without compromising on accuracy, so fast sorting is a must for companies

When it comes to optimizing the performance and longevity of lithium-ion batteries, sorting cells by capacity is a must, especially for 18650 lithium-ion cells used in everything from electric vehicles to portable electronics. Cell sorting plays a big part in improving battery pack performance as well as lifespan. In this article, we will examine the best way to sort 18650 lithium-ion cells by capacity and why cell sorting is required. Why is the cell sorting in the first place? Not every lithium-ion battery in all possible chemistries has the same design. In fact, cells have different performances, which can be measured in many different ways (capacity, cycle life, charge/discharge power, etc.). And mainly it is unavoidable that cells do not have precisely the same capacity even if you do everything right. In case of using unselected cells in series and parallel connections, this later fact leads to some cases where mixing and matching cells can lead to potential damage, especially f

In lithium battery manufacturing, shipment is not the end of the process. For battery factories, and particularly those in the tricky business of providing power battery packs, energy storage systems or solar applications, cell grading prior to shipment is as much of a necessity as it is not an option. No matter whether the factory builds 18650, 21700, prismatic or pouch cells, grading systems help assure consistency, safety and long term guaranteed performance for downstream customers. Battery cells are never exactly the same Even when battery cells are built in exactly the same production line, with the same materials and equipment, small differences will form between them. These differences usually arise in: Capacity (mAh or Ah) Internal resistance (IR) Voltage after formation Self-discharge rate If these ungraded cells were shipped directly without a final APC process, the differences may not become immediately apparent, but will quick become apparent once assembled batteries begi

In today’s fast-paced battery technology landscape, the battery sorting machines contribute to the overall efficiency of the system while allowing for more accurate categorization. Battery sorting machines are machines that automate the sorting of batteries based on a variety of different criteria, for example, things such as category (AAA or AA, for example), type, capacity and even voltage use. As is evident, while the core function differs there are important differences between automatic battery sorting machines and semi-automatic battery sorting machines. 1. Battery Sorting Machines- Automatic vs Semi-automatic Automatic Battery Sorting Machines There are a few types of automatic battery sorting machine in existence today. There exists a sorting machine that primarily separates batteries by category, which is primarily designed for AA and AAA batteries. Other separate sorting machines are designed for the more general automatic sorting of battery types at larger restraints. Broad

While sorting batteries, one critical parameter to test for each individual cell is internal resistance. But how do we measure this resistance, and what relevance does it even have? Why We Care About Internal Resistance Sometimes found in the battery as self-resistance, internal resistance of a battery stores energy within the battery rather than transferring the energy outward—or vice-versa as the battery discharges. Generally, the lower the resistance the better energy can be both charged into and discharged out of a battery. This quality can be tested while sorting batteries to ensure higher quality, more reliable cells are used for assembly, and generally a more efficient battery pack when complete. Tools to Test Battery Internal Resistance There are a few handy devices to test internal resistance when sorting batteries: Battery Internal Resistance Testers Usually just plug-and-go style, these specialty instruments are capable of quickly and superficially measuring the battery’s i

Many people assume when sorting lithium cells that voltage is the only necessary metric we need to care about to determine if a specific cell is a good or bad one. Voltage alone simply cannot sort/test a lithium cell to ready it for use in applications like energy storage, electric vehicles, consumer electronics and more. Why Sorting on Voltage Is Not Enough 18650, 21700, prismatic and pouch lithium batteries all can look the same when we consider voltage alone. These cells might have the same voltage even at the end of their life. And voltage alone leaves us utterly in the dark about a battery’s health and performance capabilities. Here are just some of the reasons we can’t rely on voltage sorting: Voltage Doesn’t Show the Capacity of the Battery Voltage tells us that the cell might be charged, and that the cell is at a certain point in the charging curve. But the voltage is not an actual test of capacity of the battery. If two cells have exactly the same voltage, one might have lost

In the realm of battery manufacture and recycling, being able to accurately sort lithium-ion cells is crucial for quality as well as safety and performance of the final product, and it’s important for cells such as the 18650 and 21700 which are the workhorses for consumer electronics, EVs, and large storge batteries. Battery sorting machines need to ensure that end cells in a pack end up with similar voltage, capacity, internal resistance characteristics, and overall efficiency comes from good sorting accuracy. But what does standard even mean in this context? To start with, battery sorting accuracy is dependent on: Cell Type/Size: 18650/21700, although both are lithium-ion, are notably different in size and energy potential;. Internal Resistance and Voltage Consistency: A common characteristic on the cell to base the sort is voltage, and a big difference in internal resistance or voltage effectively leads to poor sorting. Sorting Technology: Machine/technologies differ from IR absorb