6 practical tips for lithium iron phosphate batteries

Best 6 practical tips for lithium iron phosphate batteries (lifepo4). The lifepo4 battery has not been marketed for a long time. Users in marine,golf carts, industrial, solar energy storage systems, RVs, trailers, campers, medical equipment and equipment need to pay attention to the following matters, which can help you buy lifepo4 batteries , prolong battery life cycle and avoid safety hazards.

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Table of Contents

1. Pay Attention To Charging Lithium Iron Phosphate Battery

If it is found that the indicator light does not turn green after 10 hours of continuous charging of the lifepo4 battery, it means that the overcharge protection function is faulty, and the charging should be stopped. If the temperature of the battery becomes hot, it should be repaired as soon as possible. More than 8 hours, otherwise the battery will be damaged due to swelling and deformation.

2. Pay Attention To The Charging Frequency Of Lithium Iron Phosphate Batteries

Because the lifepo4 battery has no memory effect, it can theoretically be charged at any time. The specific charging frequency depends on the use of the lifepo4 battery. When the voltage drops to the battery warning reminder, it needs to be charged as soon as possible. Even if the battery still has a lot of remaining power, then you just charge it in advance, because you don&#;t really lose &#;1&#; charge cycle life, that is, &#;0.X&#; times.

3. Pay Attention To The Discharge Of Lithium Iron Phosphate Battery

The lifepo4 battery has an overcurrent protection function. When the current of the electrical equipment exceeds the maximum output current of the product, the overcurrent protection circuit action will stop the equipment from working, indicating that the power is insufficient.

4. Note On Lithium Iron Phosphate Battery Chargers

For the charger of lifepo4 battery, it is best to use the special charger provided by the manufacturer. Do not arbitrarily use other types of chargers or chargers with incompatible charging voltages. If the original charger is broken, it is best to buy the original model of the charger. The original original model is always more suitable and safer.

5. Attention To The Environment Of Lithium Iron Phosphate Battery

The use environment temperature of lifepo4 battery should be suitable, the charging temperature is 0 &#; ~ 45 &#;, and the discharge temperature is -20 &#; ~ 60 &#;. It should be in a clean, dry and ventilated environment, avoid contact with corrosive substances, and keep away from fire and heat sources.

6. Lithium Iron Phosphate Battery Storage Attention

When the lifepo4 battery is fully charged, the more its capacity is lost. Therefore, for the lifepo4 lithium battery pack that will be idle, the recommended charging capacity is 40%.

Although there are many precautions for the use of lifepo4 lithium batteries, in the process of actual use, those small mistakes will not cause much impact. Advocating the correct use of lifepo4 lithium batteries can maximize the cycle and safety of lifepo4 lithium batteries.

If you have any questions or corrections about the knowledge of lifepo4 lithium batteries, please leave a message in the comment area, and the engineers of the Keheng lithium battery manufacturer will reply to you within 48 hours.

What Is A LiFePO4 BMS?

A Lifepo4 BMS is an integral part of any lithium-ion battery system &#; it&#;s responsible for keeping the cells within the battery pack healthy and performing optimally.

Every battery has a specified range of voltage, current, and temperature in which it can safely operate. If one or more of these parameters varies considerably from their specified range, your battery pack can get permanently damaged (due to degradation of its components) and even pose safety risks.

Most batteries come with a built-in BMS to prevent this from happening.

But how does a BMS prevent you from damaging your battery pack?

A LiFePO4 BMS controls the discharge and charge processes of LiFePO4 battery packs. So if anything goes wrong during these processes, the BMS protection immediately kicks in and adjusts the charging parameters or cuts off the power flowing to and from the battery pack entirely.

Moreover, a BMS monitors the battery cells and makes sure they&#;re all working together correctly. It also measures parameters like voltage, current, and temperature to ensure that the battery is healthy and safe.

This way, a BMS helps prevent your battery from:

• Overcharge
• Overvoltage
• Overcurrent
• Overtemperature
• Cell Imbalance
• Shorter life cycle

Additionally, a BMS optimizes your battery capacity and overall performance in every charge/discharge process. This way, you can get the most out of your LiFePO4 battery pack regarding performance and lifespan.

LiFePO4 BMS Main Functions

1. Control operating conditions

Measures voltage, current, and temperature signals and controls these parameters to achieve cell balance and prevent damage to the battery.

2. Perform Diagnosis

Monitors cell-to-cell variations over time; diagnoses errors, detect safety risks, and sends warning signals to the driver (which can then initiate the proper measure to avoid this safety risk).

3. Collect and Store Data

Records the pack&#;s and the individual&#;s cell signals; stores data related to the battery&#;s life cycle history.

4. Estimate Parameters

Determines cell and pack levels such as State of Charge (SOC) and State of Health (SOH); communicates with controllers for cell balancing.

How Does A LiFePO4 BMS Work?

A LiFePO4 BMS consists of several hardware and software functional blocks programmed with functions that protect the battery pack by monitoring and controlling its charge and discharge conditions.

A good BMS should offer protection against:

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• Over and under-voltage
• Over and undercurrent
• Cell Imbalance
• Over and under temperature

The same applies to Undervoltage: when the voltage monitor detects a voltage lower than the minimum charging or discharging voltage, the cut-off transistor kicks in, stopping this charging voltage from reaching the battery, thus avoiding any damage to the battery pack.

Cell Balancing

Another primary function of a LiFePO4 BMS is ensuring that all cells in a pack are correctly balanced.

Balanced cells mean that if you were to measure the voltage of each cell individually, you&#;d find the same value for every cell. This helps prevent the battery from charging/discharging erratically.

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Here&#;s how a BMS balances a battery pack: by changing the charging current for one or more individual cells in the pack, making it different from the pack current, in one of the following ways:

• Removing charge from the cell charged the most provides &#;space&#; for additional charging current to prevent overcharging and allows the less charged cells to receive more charging current.

• Redirecting the charging current (partially or entirely) to the less charged cells, allowing them to receive a charging current for an extended period until cell balance is reached.

Temperature Control

A temperature sensor sends the battery&#;s temperature signal to the BMS&#;s monitoring unit. If a potentially dangerous charging or discharging temperature is detected, the BMS automatically cuts off any power to and from the battery, preventing any safety risks related to over or under temperature.

Cut-off Voltage And Current

Battery management systems have current-driven and voltage-driven cut-off transistors that can cut off the power from the charger to the battery or from the battery to the load.

These transistors act as switches: when the cell voltage monitor detects a voltage higher than the system can handle, the switch is turned off, protecting the battery from overvoltage.

Do Lithium Batteries Needs A BMS

Lithium-ion batteries do not require a BMS to operate. With that being said, a lithium-ion battery pack should never be used without a BMS. The BMS is what prevents your battery cells from being drained or charged too much. Another important role of the BMS is to provide overcurrent protection to prevent fires.

BMS modules are not expensive (compared to the rest of the battery pack) and they are relatively easy to install. So, there is really no reason to not use a BMS. There are a few super special and rare situations where it may make sense to not use a BMS, but they are outside of the scope of this article.

How To Know What Size Of BMS To Get

When someone refers to the &#;size&#; of a BMS, they are generally referring to the maximum amount of current the BMS can handle. You need to make sure to get a BMS that can support the amount of power that is required by your load.

In fact, it&#;s a good practice to add about 15% more current carrying capacity just so you have a little bit of headroom. After all, you don&#;t want to run your BMS (or anything else, for that matter) at its absolute maximum ratings.

Let&#;s say you have a W inverter that you want to be able to safely run at max load. In this example, we will consider a 7S lithium-ion battery running a 24-volt AC inverter. A 7S lithium-ion battery has a fully charged voltage of 29.4 volts and a dead voltage of about 18.5 volts.

Drawing a W load from the battery pack will require around 37 amps when the battery is fully charged.

 watts ÷ 29.4 volts = 37.4 Amps

At first glance, it may seem like you just need a 45 amp BMS. After all, your peak current will only be 37.4 amps, and adding an extra 15% to that comes to just 43 amps.

But wait.

When the battery is nearly dead, the voltage will be much lower. So, what happens when the amount of watts that you need stays the same but the voltage goes down?

The current goes up.

 watts ÷ 18.5 volts = 59.5 Amps

As you can see, you have to plan for the maximum amount of current that your battery will have to provide at its lowest voltage. So, in this example, you would want a 70 amp BMS.

What Happens If You Build A Lithium Ion Battery Pack Without A BMS

Lithium-ion battery packs are composed of many lithium-ion cells in a complex series and parallel arrangement. Many cells are needed when building a battery pack in order to provide the right amount of voltage, capacity, temperature, and current-carrying capacity characteristics.

The ways in which lithium-ion cells have to be arranged inside a battery pack depends on the cells and connections to the cells being exactly the same. In the real world, however, this is never the case. Even if cells are the same brand and type, and even if they are from the same production run in the factory, no two are the same. Also, no two spot welds and no two solder joints are the same.

So, because of this, there needs to be some active circuitry living inside the battery pack that monitors its internal state so corrections to natural imbalances can be made. The BMS actively monitors each cell group&#;s voltage and provides a balanced current to compensate.

The BMS shuts things down when they get out of spec. If anything unusual happens, a BMS will do what it can to resolve the problem. If it cannot, it will effectively put the BMS into sleep mode which shuts the battery pack off. Building a battery without a BMS is dangerous and can result in fires, injury, and loss of life.

How to choose a Right BMS for liFePO4 battery cells ?

If you are looking to build safe-high performance battery packs, then you are going to need to know how to choose a BMS for lithium batteries. The primary job of a BMS is to prevent overloading the battery cells. So, for this to be effective, the maximum rating on the BMS should be greater than the maximum amperage rating of the battery.

When choosing a BMS for a lithium-ion battery, the most important aspect to consider is the maximum current rating of the BMS. In addition to that, you need to make sure the BMS supports the correct number of series cell groups. Also, wireless connectivity is important to you, make sure the BMS you are looking to buy has Bluetooth because most BMSs do not. A BMS&#;s discharge current, charge current and balance current.

When choosing a Battery Management System (BMS) for LiFePO4 battery cells, there are several important factors to consider.

Cell Compatibility: Ensure that the BMS you choose is specifically designed to work with LiFePO4 battery cells. Different lithium chemistries have different charging and discharging characteristics, so it&#;s crucial to select a BMS that is compatible with the specific chemistry of your battery cells.

Voltage and Cell Count: LiFePO4 batteries typically have a nominal voltage of 3.2 volts per cell. Determine the total voltage and cell count of your battery pack to ensure the BMS you choose can handle the voltage range. The BMS should be capable of monitoring and balancing the cells within the desired voltage range.

Current Capacity: Consider the maximum current rating of the BMS. It should be able to handle the charging and discharging currents required by your application. Make sure the BMS has an appropriate safety margin to handle peak currents without any issues.

Balancing Function: LiFePO4 battery cells benefit from regular balancing to maintain cell voltage consistency and prolong overall battery life. Ensure that the BMS has a balancing function or supports external balancing to equalize the voltage across the cells. Balancing helps prevent overcharging of some cells and undercharging of others.

Protection Features: Safety is a critical aspect of any BMS. Look for a BMS that provides protection features such as overvoltage protection, undervoltage protection, overcurrent protection, short circuit protection, and temperature monitoring. These safeguards are essential to prevent damage to the battery cells and ensure safe operation.

Communication and Monitoring: Determine if the BMS provides communication capabilities such as UART, CAN, or SMBus protocols. This allows you to monitor and control the battery pack remotely, gather data on cell voltages, temperatures, and other parameters, and integrate the BMS with your overall system.

Reliability and Quality: Choose a BMS from a reputable manufacturer known for producing reliable and high-quality products. Read reviews and seek recommendations from trusted sources to ensure that the BMS has a track record of performance and durability.

Support and Documentation: Check if the BMS manufacturer provides comprehensive documentation, including a user manual, datasheets, and application notes. Good technical support from the manufacturer can be invaluable if you encounter any issues during the installation or operation of the BMS.

By considering these factors, you can select a suitable BMS that meets your LiFePO4 battery  requirements and ensures safe and efficient operation. Remember to carefully review the specifications and consult with the BMS manufacturer or a knowledgeable expert if you have any specific concerns or questions about compatibility.

What Does 100amp BMS Mean?

When a BMS is spoken of in terms of amps, that&#;s generally in regards to its sustained current carrying capacity. So, a 100 amp BMS will be capable of supplying at least 100 amps of current continuously. The rating is a significant amount less than a BMS&#;s burst or peak capability. Generally speaking, a BMS that can do 100A continuously can do up to 150 to 200 amps for a short amount of time.

 

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