How to prevent a short circuit in lithium-ion battery packs

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

Due to the influence of many factors such as material systems and manufacturing processes, there is a risk of short circuits in the event. Although lithium-ion batteries have undergone strict aging and self-discharge screening at the factory, there is still a certain failure probability due to the process failure and other unpredictable use factors. About the power lithium-ion battery, the lithium-ion battery in its battery pack is several hundred or even tens of thousands of festivals, which greatly enlarges the short probability of the battery pack.

Since the energy included in the power lithium-ion battery pack is extremely large, the occurrence of short-circuit generation is extremely easy to induce a malignant accident, leading to personal casualties and property damage. TE's PPTC and MHP-TA series products supply a possible treatment to prevent the occurrence of malignant accidents when the power lithium-ion battery occurs. About parallel lithium-ion power lithium ion battery modules, when one or several batteries are short, other batteries in the battery module will discharge it, the energy of the battery pack will increase the temperature of the internal battery temperature.

, Very easy to induce heat, eventually leading to the fire. As shown in Figure 1. Conventional temperature detection When the battery is warmed, although it can inform the IC to cut the main circuit, but cannot stop the continued discharge inside the parallel battery module, and because the main circuit is cut off, all energy of the battery module gather in the internal short circuit battery, but new Increase the chance of thermal out-of control.

The ideal method is to cut off the connection loop in other batteries in the module when the battery is found in a short and temperature in a certain battery. Assembly TEPPTC or MHP-TA series products on a single battery, when the TE protection device can effectively block the contact of other batteries in the module, the occurrence of malignant accidents. The power lithium-ion battery pack on the number of monomer batteries is high, and the internal resistance consistency of the battery and the device is high, and the MHP-Ta is very good because of its internal bimetal structure, the consistency of the device resistance is very good.

Meet the requirements for battery internal resistance. The damage of the lithium-ion power lithium-ion battery is extremely harmful, so it is necessary to do short circuit protection of the battery pack, and the above two processing methods can effectively protect the circuit when the battery is short-circuited.

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