IC(integrated circuit) It is a kind of micro electronic device or component, which uses a certain process to interconnect the transistors, diodes, resistors, capacitors, inductors and other components and wiring required in a circuit, make them on a small or several small semiconductor chips or dielectric substrates, and then package them in a tube shell to become a micro structure with the required circuit function; All the components have formed a whole in structure, which makes the electronic components take a big step towards miniaturization, low power consumption and high reliability. It is represented by the letter "IC" in the circuit.
The high energy density of lithium-ion battery makes it difficult to ensure the safety of the battery. Specifically, in the overcharged state, the energy will be surplus after the battery temperature rises, so the electrolyte decomposes and produces gas, which leads to the crisis of ignition or rupture due to the rise of internal pressure. On the contrary, in the over discharge state, the decomposition of electrolyte leads to the deterioration of battery characteristics and durability (i.e. the reduction of charging times).
The protection circuit of lithium-ion battery is to ensure the safety in such overcharge and discharge state, and prevent the deterioration of characteristics. The protection circuit of lithium ion battery is composed of protection IC and two power MOSFETs. The protection IC is to monitor the battery voltage; When there are overcharge and discharge states, the external power MOSFET is switched to protect the battery. The functions of the protection IC are: (1) overcharge protection, (2) over discharge protection, (3) overcurrent / short circuit protection.
1 ~ 14 series battery protection IC
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