Mobile Devices Becames A Pocket Bomb
Due to the great innovation of mobile devices, electric vehicles, electric bicycle products, there are more and more consumer devices in which are equipped with lithium batteries. such as mobile phones, speakers, tablets, laptops, mobile power supply, lighting, electric vehicles, electric motorcycle, electric scooter. In order to increase the life time of the device, all vendors are trying to increase the capacity of the battery as well as the size. The size of the battery is getting bigger and bigger. The size can be from several centimeters to tens of centimeters.
In addition, in order to shorten the recharging time, the new rapid charger technologies with higher current or higher voltage are more and more popular. The charging control circuits in these rapid charging & discharging devices become the potential risk to the consumers. It can be a uncertain bomb in the pocket once the design of the controller has something wrong. It will cause a great threat to the safety of consumers.
From the event of battery explosion of Samsung Galaxy Note 7, although it may have been caused by the problem of battery components, however these mobile devices which are equipped with high-capacity batteries and rapid charging functions, may also related to the operation behaviors of the users. For example, after Pokemon Go announced, walking while charging in the outdoor environment became a common behavior to many users. It was unexpected by these mobile phone manufacturers. A safe consumer mobile device typically needs overall considerations in the design, from the possible user behaviors, such as heat limitation, the overall power heat dissipation, temperature conditions, or the smart adjustment of CPU. And the charging/discharging circuit behavior may be influenced by the high temperature environment, too. Focusing on the battery cell or battery module safety won't solve the problem completely.
The IBC Isothermal Battery Calorimeter is available in several variants to accommodate different battery sizes. With connection to an external cycler the IBC, IBC-CC and IBC-P provide accurate and easy testing of heat output from charging and discharging a single battery.
Heat occurring during the charging and discharging of batteries is largely due to their internal impedance. Characterisation of this heat at different operating temperatures is vital for efficient thermal management of cells in packs or modules.
The IAC is an Isothermal Air Calorimeter for measurement of heat flux from electronic devices, lithium ion cells and modules. It’s large sample chamber measures 275 x 275 x 175mm accommodating a wide variety of sample sizes. Power compensation control allows for accurate measurement of heat flux.
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