Last Updated on: 16th June 2024, 02:13 pm

What Can We Do If The Lithium Battery Is Overheating?

What Can We Do If The Lithium Battery Is Overheating? How To Troubleshoot Common Faults Of Battery System?

Battery packs are the key part of many modern devices, especially in the growing field of electric vehicles and portable electronics. However, one common and serious issue is the overheating of battery packs. Bonnen Battery, a leading professional lithium battery manufacturer, delves into the causes, diagnostics, and solutions for overheating in battery packs, along with other common troubleshooting techniques, providing their insights as below.

I. What is going on when the battery pack is overheating?

Battery pack overheating (or define battery over temperatures) means that its internal temperature exceeds the allowable operating range. This can lead to a series of serious consequences, such as reducing battery performance and life, and even causing battery safety issues, leading to explosions or fires.

II. What factors cause the battery pack temperature to be too high?

The main causes are:

Environmental factors: such as high temperature environment will increase the temperature of the battery pack itself, such as in hot summer, the battery pack exposed to the sun is likely to exceed the allowable value;

Charging factors: too fast charging speed or too high charging current will greatly increase the internal heat of the battery, and then the temperature will rise; – Blog: How to Charge Lithium ion Batteries?

Discharge factors: high current discharge will also cause the internal heat of the battery to increase and the temperature will rise;-Blog: Lithium Ion Battery Charging And Discharging Tips

Battery ageing: as the use time increases, the internal impedance of the battery increases, the heat generated during charging and discharging is greater, and it is more prone to overtemperature;

There are also battery failures, such as internal short circuits that will cause the battery to continue to heat up and cause the temperature to get out of control.

III.  How to Accurately Diagnose the Cause of Overheating?

To pinpoint the exact cause of overheating, Bonnen engineer suggest following diagnostic steps:

Environmental Factors: First, check whether the ambient temperature of the battery pack is too high, High ambient temperatures can significantly increase the temperature of the battery pack, especially when exposed to direct sunlight during hot summer days.

If the ambient temperature is too high, you need to take measures to lower the ambient temperature, such as shading the battery pack or ventilating it to dissipate heat.

Check the charging status: Check whether the charging speed and charging current of the battery pack are too high. If they are too high, you need to adjust the charging parameters.

Check the discharge status: High discharge currents can also cause internal heating. If it is too large, you need to adjust the discharge strategy.

Check the battery status: Check whether the battery has obvious swelling, deformation, etc. If so, it indicates that the battery may be faulty and needs further inspection.

Data analysis: By analyzing the relevant data of the battery management system, it can be determined whether there is a short circuit or other fault inside the battery.

IV. What can I do if the battery pack temperature is too high?

Depending on the reason why the battery pack temperature is too high, you can take the following measures:
Reduce the ambient temperature: Take measures to reduce the ambient temperature of the battery pack, such as shading the battery pack or ventilating it to dissipate heat.

Adjust charging parameters: reduce charging speed and charging current.

Adjust the discharge strategy: Reduce the discharge current. The temperature monitoring system of the battery pack usually sets two high temperature thresholds. When the battery pack temperature exceeds the first high temperature threshold, the battery management system will issue a warning signal; when the battery pack temperature exceeds the second high temperature threshold, the battery management system will take measures to protect the battery, such as reducing the charging power or stopping charging.-Blog: What are the types of EVs charging?

Replace the battery: If the battery is faulty, you need to replace it with a new one.

In practical applications, the temperature of the battery pack is usually affected by multiple factors, so it is necessary to comprehensively consider various factors to formulate a reasonable temperature control strategy.

V. What is the principle for dealing with the problem of battery pack overtemperature?

Safety first: Ensuring the safety of personnel and property is the primary principle. Before troubleshooting, carefully check the battery pack for leakage, bulging, smoking, etc., and take necessary isolation measures.

Quick Judge: Accurately and quickly locating the cause of the fault is the key to solving the problem. Make full use of battery management system data, visual inspection, electrical testing and other means to narrow the scope of the fault.

Professional handling: Complex faults should be diagnosed and handled by professionals. Do not disassemble or repair the battery pack by yourself to avoid secondary damage.

VI. What are the diagnostic methods for other common faults in battery systems?

Voltage abnormalities: we can monitor the battery cell voltage, total voltage and other parameters to determine whether there are overvoltage, undervoltage, inconsistent cell voltage and other faults;

Current abnormalities: we can monitor the charging current, discharging current and other parameters to determine whether there are overcharge, overdischarge, high current impact and other faults;

Temperature abnormalities: we can monitor the battery pack temperature to determine whether the temperature is too high, too low and other faults;

Impedance abnormalities: we can measure the battery internal resistance to determine whether there are aging, damage and other faults;

Data abnormalities: we can analyze the battery management system data to determine whether there are BMS faults, communication faults and other problems.

VII. What to do after fault diagnosis?

Minor faults: Minor faults, such as slight inconsistency in battery cell voltage, can be repaired by adjusting the charging strategy, balanced charging, etc.

Serious faults: For serious faults, such as serious battery damage, BMS failure, etc., it is necessary to replace the battery or repair the BMS.- Blog: How Important Is The BMS?

VIII. How to reduce the occurrence of battery pack failure?

To reduce the occurrence of battery pack failure, Bonnen, a professional lithium battery manufacturer, suggests the following preventive measures:

1). Correct Usage and Maintenance: Use and maintain the battery pack properly to avoid overcharging, over-discharging, impacts, and squeezing.

2). Regular Inspections: Check and maintain the battery pack regularly to detect and resolve potential problems promptly.

3). Avoid Extreme Temperatures: Do not use the battery pack in extremely high or low-temperature environments.- Blog: Why Do Lithium-ion Batteries Fear The Cold?

4). Prevent Physical Damage: Avoid impacts and ensure the chassis is not scraped or squeezed, which can damage battery cells or compromise the battery pack’s waterproofing.

5). Choose Quality Suppliers: Select high-quality battery suppliers and battery management systems to enhance the reliability and safety of the battery pack.- Blog: 20 Pro Tips for Choosing The Professional And Reliable Lithium Battery Manufacturer

By following these guidelines, you can significantly reduce the risk of battery pack failures and ensure long-term, reliable performance.

Bonnen Battery is dedicated to providing innovative battery technology and solutions, ensuring that your devices run smoothly and safely. For more information on how Bonnen Battery can help you with your lithium battery needs, visit our website and explore our range of products and services.

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