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Forklift lithium battery manufacturers talk about whether lithium iron phosphate battery packs need BMS? In recent years, large capacity batteries without secondary pollution have emerged one after another, and their performance to price ratio has become increasingly high. It is necessary to constantly understand the properties of batteries, which requires a battery management system to achieve. However, not only will some people wonder, does a forklift lithium battery pack require a BMS?

Composition of forklift lithium battery pack

(1) Battery module

For example, a 50Ah lithium iron phosphate battery requires 16 batteries with a single unit of 3.2V. This model of battery has a height of 4U and can be embedded and installed in non machine room cabinets, and a single battery pack can be used in parallel to form a larger capacity battery pack.

(2) Battery Management System (BMS)

BMS is an important circuit system used to manage the charging and discharging process of batteries, improve their service life, and provide users with relevant information. BMS generally consists of monitoring, protection circuits, electrical, communication interfaces, thermal management devices, and other components. Its important functions include intelligent charging management, battery balance management, intelligent intermittent charging and discharging management, thermal system management, and communication management.

Forklift lithium battery pack requires BMS

The ideal lithium power battery has a high degree of performance consistency. As long as it is not charged or discharged during use, there is no safety issue. However, the actual situation is that the quality of mobile phone batteries fully meets the standards when they leave the factory, but there are incidents of explosions during use. There are also reports of fires, explosions, and product recalls for laptop battery packs.

From the appearance to the end of its lifespan, there are safety issues with lithium batteries in forklifts. Even if they fully comply with international safety standards when leaving the factory, they will evolve from a safe state to an unsafe state during use. The performance of high-quality individual lithium forklift batteries will gradually decline and reach their lifespan limit. Poor quality individual batteries will gradually experience various abnormal deterioration and decline in performance during use, Enter the unsafe state of concern. This is a gradually accumulating process of change.

BMS is not as optional as some battery production companies claim, but rather a must have, and it must be integrated throughout the application of forklift lithium battery packs. There have been many studies on BMS both domestically and internationally, and it has been applied in many fields, which can meet the needs of some markets. The application of lithium power batteries has put forward higher requirements for battery management systems. Ensuring the safety of power lithium battery packs is the primary task of power forklift lithium battery management systems.

Fault analysis method for BMS of forklift lithium battery pack

Fault recurrence method

The faults of forklift lithium battery pack BMS vehicles vary under different conditions. If conditions permit, try to reproduce the faults under the same conditions and confirm the problem points.

Exclusion method

When similar interference occurs in the system, each component in the system should be removed one by one to determine which part is causing an impact on the system.

● Replacement method

When a module experiences temperature, voltage, control or other abnormalities, swap the positions of modules with the same number of strings to diagnose module or harness issues.

lithium forklift batteries are used to supply driving power to the entire vehicle, and they are protected by a metal shell to form the main body of the battery pack. The integration of battery cells is achieved through modular structural design, which includes the cooling hardware of the battery cells. The quality of the cooling system design is a prerequisite for BMS to achieve excellent management.

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