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Why a Battery Management System is Essential for Modern Energy Applications?

As battery-powered systems continue to evolve in complexity and scale, the importance of intelligent control mechanisms becomes increasingly evident.

A Battery Management System (BMS) is essential for ensuring that batteries operate safely, efficiently, and reliably across a wide range of applications, from electric vehicles to industrial machinery.

Without a BMS, even the most advanced battery cells are susceptible to misuse, premature ageing, and failure. For technical professionals working with battery-integrated systems, understanding the role and capabilities of a BMS is key to unlocking performance and longevity.

 

Safety Monitoring: The Foundation of BMS

The first and most fundamental function of a BMS is safety monitoring. This involves real-time tracking of voltage, temperature, and current across individual cells and the entire pack. Voltage must be kept within strict boundaries to prevent overcharging or deep discharging, both of which can lead to degradation or hazardous conditions. Temperature monitoring ensures the battery remains within its safe operating range, avoiding thermal runaway or accelerated wear. Current sensing protects against excessive loads or charging rates that could damage the cells. Together, these safeguards form the foundation of a robust and secure battery system.

Battery State Estimation: Unlocking Performance Insights

A second critical function is battery state estimation, which provides insight into the battery’s internal condition—data that cannot be directly measured. This includes estimating the State of Charge (SoC), State of Health (SoH), and State of Power (SoP). Accurate estimation enables better energy management, predictive maintenance, and system optimization. For example, SoC informs range predictions and charging strategies, while SoH helps assess remaining useful life and plan replacements. These estimations rely on advanced algorithms that interpret sensor data, historical usage, and electrochemical models to deliver actionable insights.

Cell Balancing: Ensuring Longevity and Consistency

The third key functionality is cell balancing, which ensures uniform charge distribution across all cells in a pack. Over time, cells can drift apart due to manufacturing differences and usage patterns, leading to reduced capacity and increased stress on weaker cells. The BMS uses passive or active balancing techniques to equalize voltages, extending battery life and maintaining performance. This is especially important in high-demand applications where consistency and reliability are paramount.

The Cleantron BMS exemplifies advanced battery management with features tailored for demanding applications. It offers highly accurate state of charge and state of health estimation, enabling precise energy control and lifecycle planning. Its temperature-controlled charging ensures optimal thermal conditions during charge cycles, reducing ageing and enhancing safety. Additionally, Cleantron’s innovative Multi Pack Configuration (MPC) allows multiple BMS units to operate in masterless parallel configurations, simplifying system architecture and improving scalability. These capabilities make the Cleantron BMS a powerful solution for modern battery systems that require flexibility, intelligence, and reliability.

In conclusion, the Battery Management System is a critical enabler of safe, efficient, and long-lasting battery operation. As battery applications grow in scale and complexity, the BMS becomes increasingly central—not just as a protective layer, but as a sophisticated control unit that optimizes performance and extends battery life. By managing safety parameters, estimating internal states, and maintaining cell balance, the BMS ensures that battery systems can meet the high expectations of modern energy applications.

The Cleantron’s Battery Management System Advantage

The Cleantron BMS stands out in this landscape by combining robust safety features with advanced control capabilities. Its precise state of charge and health estimation, intelligent temperature-controlled charging, and innovative Multi Pack Configuration (MPC) architecture offer a flexible and scalable solution for demanding applications. Whether deployed in a single pack or across a distributed system, the Cleantron BMS provides the intelligence and reliability needed to support the next generation of battery-powered technologies.

In conclusion, the Battery Management System is a critical enabler of safe, efficient, and long-lasting battery operation. As battery applications grow in scale and complexity, the BMS becomes increasingly central—not just as a protective layer, but as a sophisticated control unit that optimizes performance and extends battery life. By managing safety parameters, estimating internal states, and maintaining cell balance, the BMS ensures that battery systems can meet the high expectations of modern energy applications.

The Cleantron BMS stands out in this landscape by combining robust safety features with advanced control capabilities. Its precise state of charge and health estimation, intelligent temperature-controlled charging, and innovative Multi Pack Configuration (MPC) architecture offer a flexible and scalable solution for demanding applications. Whether deployed in a single pack or across a distributed system, the Cleantron BMS provides the intelligence and reliability needed to support the next generation of battery-powered technologies.

Why Cleantron for Electric Vehicles Batteries?

Cleantron is an European leader in advanced lithium-ion batteries. We provide made in The Netherlands advanced batteries for light electric vehicles and other market sectors, like agricultural and industrial applications and solutions. Our products are built on captive BMS technology and the commitment to a long-term reliability. Whether you’re developing LEVs or micro cars, our battery technology gives you the flexibility and reliability to scale successfully.

We provide a full range of modular batteries, including low voltage and high voltage solutions. 

Alongside our standard batteries, Cleantron’s core business is to develop tailored battery modules for OEM customers. 

Contact us to see how Cleantron can help power your next product.

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How to Charge a Lithium-Ion Battery Safely: Voltage, Temperature, and Fast Charging

Charging a lithium-ion battery may seem straightforward, but it involves a complex interplay of electrical, thermal and chemical dynamics that must be carefully managed. Well controlled charging helps to ensure performance, safety and longevity.

This article will give an insight how achieving lithium-ion batteries charging in a way that is time efficient, safe and leads to limited battery degradation.

 

Why Voltage, Temperature and Current do matter

When charging a lithium-ion battery, the basic is to keep the Voltage within safe limits. Overvoltage can lead to degradation or even safety hazard, while charging with a too low voltage may result in an incompletely charged battery.

Temperature is another critical factor. Batteries must be charged within a wide thermal window. Exceeding the temperature boundaries may cause accelerated wear and in extreme cases a thermal runaway. These temperature boundaries require an electronic control system (BMS) that can dynamically adjust the charging parameters real-time.

The lithium ion battery lifespan is significantly influenced by the charging process itself. High charging currents, desirable for fast charging, can accelerate aging by inducing a higher risk of battery degrading, leading to increasing internal resistance. In turn, the increased resistance leads to elevated temperatures during charging. These higher temperatures on their own can also contribute to an increase in chemical degradation, reducing the battery life as well. So fast charging is bad for the battery cycle life. Cleantron is balancing fast charging with minimal wear  which can only be achieved with a deep understanding of the mechanisms behind degradation, enabling positive trade-offs from these mechanisms.

 

Fast Charging: What Happens Inside the Battery and how to prevent battery degradation

To understand these mechanisms better, it is helpful to examine what happens inside a battery when being charged at a high rate. When charging an EV, it is noticeable how the initial charging phase is typically relatively rapid. The reason for this is that when the Cell is still far from achieving its maximum voltage, the high current charge has minimal penalty as the potential of the electrode is not yet too high.

However, as the battery gets closer to being full the battery charging rated typically goes down. This slowdown is necessary to prevent the electrode potential from reaching a critical level. A critical high potential promotes side reactions that degrade the Cell.

These degradation effects are further worsened by ion collisions. This process is comparable to a parking lot: when it’s empty, finding a spot is relatively easy, and can be done at a high speed. However, when the parking lot is getting full, it becomes harder and harder to find a spot, and if you drive too quickly the risk of having a crash into another car increases. Lithium-ions experience something similar while charging resulting in damage and therefore to battery degradation.

The standard response to prevent battery degradation is to decrease the speed at the end of charging, typically with a fixed profile. However the more smart battery management of Cleantron controls this dynamically, especially when taking the temperature boundaries into account.

How Temperature Affects Lithium-Ion Battery Charging and Safety

The temperature plays a drastic role in charging. It is preferable for a battery to not be too cold nor too hot at the start of charging. A temperature around 25°C is generally considered ideal. While in many applications it is possible to equip the battery pack with a suitable thermal management system to cool or heat the battery to this temperature. There are various ways to do this, such as air cooling, cooling via a cooling plate with a coolant or refrigerant and finally immersion cooling. All with varying degrees of complexity and increasing degrees of effectiveness. Cleantron is working on a novel implementation of immersion cooling that also enhances safety, more on which in a later article.

However, it is not always a possibility to include an active cooling system. One example for this are the swappable packs such as the P4X and CLP, where portability and swappable is a core feature that would be impacted by including a cooling system. On these packs we thus need to react to the temperature inside the pack to ensure optimal performance, rather than control it to stay in the optimal performance range.

 If the battery is hot, it may overheat (and the battery management stops the charging process) or if it does not reach this critical level, it undergo chemical degradation, especially when high charging currents are applied for a longer time. On the other hand, charging at low temperatures increases the risk of lithium plating, which is also worsened by high charging currents.

Cleantron’s Adaptive Charging Algorithms

It becomes clear that more than just voltage and charging time need to be carefully monitored. For this reason, Cleantron provides its customers with in-house developed adaptive charging algorithms.

This algorithm can be finetuned based on the customers wishes, such as (extreme) fast charging. As a standard, the Cleantron Battery Modules P4P, P4X and CLP are equipped with an all-purpose version of the algorithm. This standard takes into account the Current temperature of the battery and sets the ideal Charging Current and the end of Charge Voltage based on this measurement.

Besides this, the algorithm also takes into account the actual State of Charge level of the battery, as well as the State of Health, ensuring that the charging is always optimal at any point in the battery’s life. As a result, Cleantron battery packs help extend their own lifespan, reducing carbon footprint, and deliver greater long-term value.

Why Cleantron for Electric Vehicles Batteries?

Cleantron is an European leader in advanced lithium-ion batteries. We provide made in The Netherlands advanced batteries for light electric vehicles and other market sectors, like agricultural and industrial applications and solutions. Our products are built on captive BMS technology and the commitment to a long-term reliability. Whether you’re developing LEVs or micro cars, our battery technology gives you the flexibility and reliability to scale successfully.

We provide a full range of modular batteries, including low voltage and high voltage solutions. 

Alongside our standard batteries, Cleantron’s core business is to develop tailored battery modules for OEM customers. 

Contact us to see how Cleantron can help power your next product.

 

Let's Get in Touch

FAQ

What is the charging current for a lithium-ion battery?
 There is no single Charging Current for a lithium-ion battery, as this depends on:

  •       Which chemistry is inside the battery
  •       The capacity of the battery
  •       The type of battery cell (power type vs energy type)
  •       Pack-level constraints (Electronics and Thermal)

How to increase lithium-ion battery life?

Don’t keep the battery charging if it has already reached 100% and avoid deep discharges.

If a deep discharge (DUV) occurs the battery is normally beyond repair, so should not be used (“repaired” as some call it). Circumventing the BMS electronic safety measures and charging a battery after a deep-discharge results in a clear risk of fire due to Li plating. Particularly if the charging after the deep-discharge is performed too fast.

 When storing a battery for long, make sure to charge it to avoid over-discharge. It is better not to charge it at 100%: if kept in storage at high SOC, the battery might degrade faster, particularly if stored in a very warm environment (> 40°C). In general, it is best to store the battery in a non humid environment (10 – 20°C) with 50% < SOC < 80%.

What are common mistakes to avoid, when charging a li-ion battery?

  •       Never revert polarity when connecting a battery, it’s very dangerous. Most chargers have a safety function implemented to prevent that.
  •       Never charge above the supplier’s specified limits to avoid dangerous situations.
  •       Do not keep the charger connected for a long time once a battery is full. A battery will age faster if forced constantly at 100% SOC, particularly if it’s NMC Li-ion battery (which goes to higher voltages).
  •       If the battery has to be stored for several months, it is a good practice to charge it before, however not all the way to full. If left in storage for too long, it might end up deep-discharging. Even if it’s not connected to anything, its BMS will keep tapping a very small Current to keep functional, which over the months will drain the battery gradually.
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Traceability cells

Cleantron + Traceability cells

Traceability ''to a T''

From the very start to the very end of the production process, data of each step that is relevant to the product or its quality is gathered for traceability tracking and to make it available for (statistical) data analysis. Statistics is a very powerful tool in a production environment. A small set number of tasks is repeated endlessly in our production machinery, and when monitored closely for deviations this can contribute largely to improved product quality and efficiency. 

The new Cleantron production line is set up specifically to make this type of data analysis possible. At the start of the production line, each individual battery cell is tested for quality, the data is logged and then linked to the unique serial ID of the Battery Pack. This happens fully automated with all relevant information (both product and process) at each subsequent step too: cell placement, welding, programming and end of line testing.

By using unique keys and setting up the infrastructure to store this data in an easily accessible manner, at any moment during the product lifetime, we can exactly determine which individual cells, electronics and other important parts have been used in which Battery Pack. We can see what process settings were used, what the results of the process were and of course what the results of the final quality control steps were. In case any questions arise at a later date as to what happened during production and which components were used, this information is only a click of a button away. This perfects the traceability of Cleantron Battery Packs.

By using statistics and combining the data of multiple Packs, quality performance of production can be monitored and used for improvement initiatives. To accomplish this, Cleantron uses industry best practices such as Statistical Process Control, an advanced analytical technique for looking at quality data used in many high-tech industries (such as automotive). By setting the process limits based on observations and then using the statistical technique to check for deviations, any errors in the process can be caught early on. This means that problems can be solved in the process before they even have a chance to affect product quality. This leads to a more stable process, less rejected product and a deepened understanding of what is happening during the production of our Battery Packs.

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Blog Technology

Investment cell test capacity

Cleantron + Investment cell test capacity

The investment for the cell test capacity

A Battery Pack Production Line has multiple bottlenecks. Bottleneck where throughput has a large impact on the total production of the line. One of these bottlenecks is the Cleantron in house developed in line Cell Testing Station. Here each individual Cell is measured to prevent that any (micro) deviation in a Cell may eventually, over time result in a failure in a Battery Module.

These tests take up valuable time, especially when handling of the Cells to and from the testing position is considered. Up to several valuable seconds are spent on testing per cell. However, speeding up these tests, or removing them all together, impacts the accuracy of the cell tests and increases the risk of faulty cells ending up in the Battery Pack.

To solve this, Cleantron has looked at their experience & insights related to production lines and cell testing. Cleantron calls this ‘Knowledge Based Working’. This experience and knowledge is noticeable in the two main aspects of the cell testing station.
Firstly, it has been decided that the number of testing positions needed to be increased to allow for a better balance between test time and handling time. This has resulted in a Cell tester with 2 parallel testing lanes, each of which has 10 testing positions. Here the benefit is that one lane can be emptied or filled during the time the Cells in the other lane are tested. This parallelism means that the Cell handling time becomes virtually non-existent for the throughput of the cells in the production line, meaning a constant flow of Cells is available for the placement robot.

Furthermore, to ensure a high testing accuracy and a short testing time to match the total throughput of the production line, a solution had to be found for the cell testing equipment as well. Based on previous experiences, an new battery measuring technology has been selected. This technology has been used earlier in our R&D department of Cleantron to great contentment. Combined with a multiplexing unit, this allows for the connection of the 20 testing positions with just one impedance measurement tester. Use one advanced impedance tester has the major positive benefit that differences in measurement-accuracy is prevented (that could occur between different channels), while still allowing for a high throughput. Finally, to maximise this throughput, an optimal testing sequence has been specifically selected to generate the most important battery data at the quickest possible time.