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UL certification specifications for lithium battery chargers


For ul power supply, UL has gradually developed corresponding standards for the safety of various battery products as evaluation specifications, and these standards have been highly recognized by the

UL certification specifications for lithium battery chargers
 
For ul power supply, UL has gradually developed corresponding standards for the safety of various battery products as evaluation specifications, and these standards have been highly recognized by the industry. With the development of battery technology, we must expand the scope of safety to battery charger products,especially for lithium ion battery charger. When the battery is fully charged in the charger, it becomes another DC power supply for the charger beyond the mains socket of the charger. If the charger is improperly designed or if the internal parts malfunction or short-circuit, it may be caused danger. For example, filling the battery energy into the charger through the output terminal or output terminal of the charger, it will be caused the internal insulation of the charger to fail due to overheating, even be caused the shell to melt due to overheating or a fire disaster.
lithium battery charger circuit
A similar case occurred in the United States a few years ago, because a fully-charged battery caused a short circuit in the internal output terminal of the charger to become a current discharge circuit, which is caused the insulation transformer to collapse due to overheating, and the shell be melt. Due to the design of the charger and the rechargeable battery it matches with the terminal application, UL has developed a series of safety standards applicable to different types of power products. For example, UL1310 audits Class 2 output chargers, UL1012 audits general non-vehicle battery chargers, UL1236 audits car battery chargers, UL1564 audits electric golf car chargers, etc.
 
Among the safety assessment projects, the most notable is the new provision of "Backfeed Protection" BFP was derived from the aforementioned US case, including chargers covered by UL1310 and UL1012. The structure must be provided with a protection function against backfeed at the output. At the same time, it will also required an additional safety assessment of backfeed protection during actual product testing.
 
Since the charger has more potential hazards than the general power supply, no matter the structure or test project requirements, the charger will be more stricted than the general power supply products, or have more additional terms to simulate the user. The abnormal conditions that may be encountered during the charging process, and in order to protect the user more than one layer, the warning label on the charger is also within the scope of UL evaluation. For example, the product must be marked with "Backfeed Protection" or "BFP" and there must be a clear label to remind the user to only charge the specified battery with the charger, or clearly explain the type, type and number of these batteries in the user manual provided with the goods.

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