Safety mechanism of NI-MH rechargeable battery

The safety performance of NI-MH rechargeable battery is reflected in its structural design. The positive electrode of the battery is mainly made of nickel hydroxide material, which has high oxygen stability and is not easy to escape oxygen, thus reducing the risk of battery short circuit. The negative electrode is made of hydrogen absorption alloy material, which is not only highly stable, but also has hydrogen storage characteristics that make it difficult for hydrogen to escape during the charging and discharging process of the battery, further improving the safety of the battery.
Diaphragm and electrode interface regulation
NI-MH rechargeable battery uses high-temperature resistant diaphragm material, which can effectively block the heat transfer between the positive and negative electrodes and improve the thermal stability of the battery. At the same time, by optimizing the contact of the electrode/diaphragm interface, such as using compaction or impregnation processes, the interface contact impedance can be reduced, the heat generation can be reduced, thereby preventing the acceleration of the internal reaction of the battery due to high temperature, and reducing safety risks such as fire and explosion.
Overcharge and over-discharge protection
NI-MH rechargeable battery has built-in overcharge and over-discharge protection mechanisms. Overcharge protection circuits usually use electronic components such as voltage monitors or charging control chips to monitor battery voltage in real time and cut off the charging circuit when the battery voltage exceeds the safety threshold to prevent the battery from overcharging and causing internal pressure to rise, gas expansion, or even explosion. The over-discharge protection mechanism automatically disconnects the battery when the battery voltage is below the safety threshold to prevent the battery from being damaged or causing safety hazards due to excessive discharge.
Short-circuit protection
NI-MH rechargeable battery uses high-impedance diaphragm materials, optimizes the pole design, and adopts insulation protection to reduce direct contact between the positive and negative electrodes, thereby reducing the risk of short circuits. These measures can effectively prevent fires and explosions caused by accidental short circuits in the battery, and improve the safety of the battery.