Analysis on the external safety of lithium batteries

In 2017, the application of lithium batteries in the electric pallet truck industry has become a common practice. At present, the most important issues for users of pallet trucks are price and safety.

Regarding the price, the editor can tell you that the price of lithium batteries will definitely decrease gradually. More and more expensive (this is national will or global change).

The safety of the battery is divided into internal safety and external safety. The internal safety is mainly determined by the chemical characteristics of the lithium iron phosphate battery itself. Because the lithium iron phosphate battery can maintain the safety characteristics of non-combustion and non-explosion under short-circuit, extrusion, high temperature and other conditions, it is only transported by the majority of electric pallets. vehicle user approval.

What we focus on here is the external safety handling of lithium battery packs for pallet trucks.

As we all know, lithium-ion batteries have small internal resistance and no memory, so they are very suitable for rechargeable batteries that can be reused. However, the internal resistance is small. When the positive and negative electrodes of the battery are short-circuited outside, the lithium-ion battery is equivalent to a low-resistance wire, which will generate a large short-circuit current, which will cause high heat or fire. Therefore, how to cut off the external connection of the positive and negative electrodes in time when a battery short circuit occurs has become the top priority of safety management.

The Zhiyuan lithium battery where the editor is located has a complete set of safety protection mechanisms, as shown in the following figure:

In the figure, the 1# marked point represents lithium Protection measures for short circuit at the battery cells;

2# marked point represents the protection measures of the lithium battery management system;

3# marked point represents the gap between the positive and negative poles of the entire battery pack

As can be seen from the above figure, no matter what the cause is the external short circuit of the battery cell, or the lithium battery is in high and low temperature, overcharge, overdischarge, overcurrent, sudden change in internal resistance, etc. , or when the lithium battery is in the case of a short-circuit fault of the positive and negative electrodes of the battery pack, the three firewalls of the lithium battery can reliably control the risk to the minimum.

Therefore, the editor recommends that when choosing a lithium battery, you must pay attention to choosing a lithium battery with 'safety measures in place'.

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