The Importance of Charger Aging Cabinet Testing: Why Every Charger Should Not Be Ignored

How a Smaller Charger Can Do More: Optimizing Battery Charging in MEWPs

Introduction

In the world of Mobile Elevated Work Platforms (MEWPs), battery-powered systems have undergone significant advancements, particularly with the adoption of lithium-ion batteries. While larger chargers have traditionally been the norm, especially for lead-acid batteries, newer lithium technology allows for more power in a smaller form. As reported by the US Office of Energy Efficiency and Renewable Energy (EERE), lithium-ion battery energy density has increased eightfold between 2008 and 2020, prompting a reevaluation of charging strategies in MEWPs.

Charging Dynamics of Lead-Acid Batteries

Lead-acid batteries, widely used in electrified MEWPs, undergo a three-phase charging process:

1. Bulk Phase
   High power is delivered to the battery, rapidly increasing its charge level until a specific voltage threshold is reached.

2. Absorption Phase
   The charging rate gradually decreases as the battery voltage stabilizes. During this phase, the charge is absorbed more slowly to ensure the lead plates fully absorb the charge.

3. Finish Phase
   A lower current is used to maintain the battery at full charge, preventing overcharging and restoring the plates to maximum capacity.

This process is nonlinear, meaning that charging slows significantly as the battery approaches full charge. For instance, the final 20% of charging in a lead-acid battery can take as long as half the total charging time due to the absorption phase, where internal resistance mounts.

Streamlined Charging: The Lithium Battery Advantage

Lithium batteries differ significantly from lead-acid batteries in terms of charging dynamics, offering several key advantages:

1. Maximized Charging Rate
   Lithium batteries can maintain a high charging rate for the majority of the charging cycle, with a brief cell-balancing phase at the end managed by the Battery Management System (BMS).

2. Linear Charging Profile
   Unlike the nonlinear nature of lead-acid batteries, lithium batteries charge linearly. This means that the increase in charge is directly proportional to the charging time, allowing for more predictable and efficient charging.

3. Efficiency Across Charge Range
   Lithium batteries operate efficiently, especially within the 10% to 90% charge range, minimizing energy loss and heat generation.

The Potential of Compact Chargers

The linear charging profile of lithium batteries allows for the use of smaller chargers while still maintaining efficient and effective charging. For example:

• Lead-Acid Batteries: A 24V 220Ah lead-acid battery pack in a scissor lift typically requires a 700W charger to recharge overnight from 0% to 100%.
• Lithium Batteries: An equivalent 24V 180Ah lithium battery can achieve the same overnight charge (from 10% to 90%) using just a 350W charger.

This is possible because lithium batteries do not require the prolonged absorption phase that lead-acid batteries do. A smaller charger can still complete the charge within the same time frame by efficiently utilizing the linear charging profile of lithium batteries.

Advantages of Adopting Smaller Chargers in MEWP Applications

Switching to smaller chargers for lithium-powered MEWPs offers several benefits:

1. Space Efficiency
   Compact chargers like the XVE 550D are designed to fit in the limited space of compact MEWPs, making them an ideal choice for designs where space is at a premium.

2. Versatility
   Smaller chargers can be used with a wider range of battery sizes, from smaller 4x6V packs to larger 2x12V configurations, providing flexibility in fleet management.

3. Cost Savings
   By using a charger that matches the actual needs of a lithium battery, energy waste is minimized. This leads to lower operational costs and contributes to a reduced total cost of ownership (TCO).

4. Simplicity and Portability
   Smaller chargers are lighter and more portable, making them easier to handle and deploy across different environments.

Conclusion

The evolution of battery technology, particularly the rise of lithium-ion batteries, has enabled the use of smaller chargers in MEWPs without compromising performance. By understanding the differences between lead-acid and lithium battery charging profiles, fleet managers and OEMs can optimize charging strategies to improve efficiency, reduce costs, and enhance the overall sustainability of their operations.

### Introduction

Battery degradation is a natural process that affects the lifespan and performance of batteries, whether in electric vehicles, smartphones, or energy storage systems. This degradation can lead to reduced capacity, shorter life cycles, and impaired performance. While there are many factors contributing to battery degradation, the role of chargers is often overlooked. Understanding how chargers affect battery health can help optimize battery performance and extend its lifespan.

In this article, we will explore:

– The causes of battery degradation,

– The specific impact of chargers on batteries,

– And methods to mitigate battery degradation by optimizing charging practices.

### Causes of Battery Degradation

Several factors contribute to the gradual deterioration of battery cells, including:

1. Chemical Reactions

As batteries charge and discharge, chemical reactions take place within the battery’s cells. Over time, these reactions cause changes to the battery’s internal structure, leading to a reduction in capacity. For example, in lithium-ion batteries,electrolyte decomposition and the formation of solid electrolyte interfaces (SEI) on the anode can limit the battery’s ability to store and release energy efficiently .

2. Overcharging

When a battery is charged beyond its full capacity, it can lead tooverheating and cause permanent damage to its internal components. This often occurs when chargers do not have overcharge protection features, leading to faster battery degradation .

3. High Charging Currents

Fast charging, while convenient, often delivers higher charging currents to the battery, causingthermal stress. Over time, this high heat accelerates wear and tear on battery components, resulting in a shorter lifespan .

4. Deep Discharge Cycles

Discharging a battery to very low levels frequently can accelerate its degradation. This process stresses the battery’s electrodes and makes it harder for the battery to retain a charge .

### Effects of Chargers on Battery Degradation

Chargers play a critical role in determining the lifespan of a battery. Poor charging habits or substandard chargers can accelerate the rate of degradation, whereas smart chargers and optimal charging practices can prolong battery life. Here’s how:

1. Overcharging and Undercharging

Chargers that are not equipped with intelligent control mechanisms may continue supplying power even after the battery is fully charged, causingovercharging. Conversely, some chargers fail to properly maintain a charge, leading to undercharging, which over time can weaken the battery’s ability to hold energy .

2. Fast Chargers and Thermal Stress

Fast chargers deliver higher currents to speed up the charging process, which is particularly common in devices like smartphones and electric vehicles. However, this rapid charging generates heat, which is a leading cause ofthermal degradation in lithium-ion batteries. Over time, constant exposure to high heat can degrade both the anode and cathode materials, significantly reducing the battery’s capacity .

3. Inconsistent Charging Patterns

Some chargers cause inconsistent charging patterns, which result involtage fluctuations. These fluctuations can be detrimental to battery health, particularly in sensitive devices like laptops or EVs, leading to quicker capacity loss .

### Mitigations for Battery Degradation Caused by Chargers

Understanding how chargers affect batteries allows for strategies to mitigate battery degradation. Here are some effective methods:

1. Use Smart Chargers

Smart chargers or intelligent chargers are designed with features like overcharge protection, temperature regulation, and optimized charging cycles. These chargers ensure that the battery is not exposed to unnecessary stress during charging, helping prolong battery life .

2. Avoid Fast Charging When Possible

Although fast chargers are convenient, they are one of the main causes of heat-induced degradation. Opt forslower charging when time allows, as this reduces thermal stress and can extend the battery’s overall lifespan. Most devices come with an option to disable fast charging .

3. Charge in Moderate Environments

Charging your device in an environment that is too hot or too cold can negatively impact battery health.Temperature-controlled charging is crucial in both portable devices and larger battery systems like EVs. Some chargers come with temperature sensors to regulate charging in different conditions .

4. Partial Charging Cycles

Many modern devices, especially those powered by lithium-ion batteries, benefit frompartial charging cycles. Instead of charging from 0% to 100%, aim to keep the battery level between 20% and 80%. This reduces the number of deep charge and discharge cycles, minimizing the wear on battery materials .

5. Regular Monitoring of Battery Health

Some smart chargers and devices offer features that monitorbattery health and usage patterns. Keeping an eye on these diagnostics helps identify when the battery starts to degrade so you can adjust charging habits accordingly .

### Conclusion

Chargers play a pivotal role in the overall health and longevity of batteries. By understanding the causes of battery degradation and the impact of chargers, users can adopt practices that mitigate the harmful effects of overcharging, fast charging, and thermal stress. Investing in smart charging solutions and maintaining moderate charging cycles will ensure that batteries last longer and operate more efficiently.

Stay tuned with us at XVE, we are at the forefront of this innovation, driving excellence in charger technology. Our cutting-edge solutions are designed to maximise the efficiency, reliability and safety of lithium battery charging.

Ready to make the switch? Join us in shaping the future of power with XVE chargers.