Application of Patch Fuse in Single Lithium Battery Protection Board
Nowadays, more and more products such as mobile phones, digital cameras (cameras), PDAs, MP3/4, etc. use lithium batteries as the power supply for system circuits. The requirements for power supply emphasize the advantages of lithium batteries such as small size, high energy density, no memory effect, and the ability to be reused multiple times. However, lithium battery explosions have also occurred frequently recently.
So the safety of lithium-ion batteries is increasingly attracting people's attention. Choosing the appropriate patch fuse for the lithium battery protection board is also very important.
1、 Composition of a single lithium battery
Lithium batteries mainly consist of battery cells and battery protection plates
The main functions of the lithium battery protection board are:
(1) overcharging protection
(2) over-discharge protection
(3) overcurrent/short circuit protection
Main components of lithium battery protection board: 1. Protection IC2, MOSFET3, SMDFUSE
2、 Selection of Fuses on Single Lithium Battery Protection Board
1. Packaging: The trial size is determined based on the customer's circuit board, usually 1206/0603 size.
2. Rated voltage: above 24V
3. Rated current: Generally, 5A is used (considering that the fuse is protected twice on the lithium battery protection board, so Consider the protection delay time of the protection IC to determine the fuse blowing time.
4. Cold resistance: below 15mΩ
5. Safety requirements: UL certification
6. Comply with RoHS requirements and Halogen Free requirements
Fig.1
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