Quote: (keyword: mobile payment terminal polymer battery) mobile payment is to allow users to use their mobile terminals for the consumption of goods or services accounting payment of a service. The unit or individual sends the payment instructions directly or indirectly to the banking and financial institutions through mobile devices, the Internet or near distance sensing, resulting in the payment of money and the transfer of funds, so as to realize the mobile payment function. Mobile payment will be terminal equipment, the Internet, application providers and financial institutions integration, to provide users with currency payment, payment and other financial services. The mobile payment terminal uses high performance lithium battery to supply power to meet the need of continuous, efficient and stable operation.
I. requirements for lithium battery design for mobile payment terminals:
According to the customer's requirements and product specifications, design the battery pack with the host, integrate the lithium battery and safety protection performance into the solution. In the design process of the whole project, in order to achieve the perfect integration with the host for the direction, to ensure the safety of batteries, the battery and the whole system as the premise, to meet the design of the corresponding laws and regulations and certification regulations is preferred. At the same time, in order to ensure the safety and reliability of lithium batteries, multilayer protection should be adopted inside the battery pack to prevent the lithium battery from being damaged by overcharging, over discharge or short circuit.
1) lithium battery model design requirements: 402060-1S1P/450mAh/3.7V.
2) circuit design requirements:
1 、 single section overcharge protection voltage: 4.28 + 0.25V
2, single section overcharge recovery voltage: 4.08 + 0.50V
3 、 single pass protection voltage: 3 + 0.08V
4, single section over discharge recovery voltage: 3 + 0.08V
5, combined battery over-current protection value (10ms): 1.5~3.5A
6, combination battery over temperature protection value (recoverable): 70 + 5 degrees
7, the finished battery also has short circuit, reverse charge protection.
3) battery cycle life design requirements: 300~500 times (GB charge discharge standard)
4) battery size design requirements: refer to the main shell
Two, mobile payment terminal lithium battery design:
1) protection board (PCM): the main protection circuit design of rechargeable lithium battery group, because the chemical properties of lithium battery itself, the need to provide intelligent computing, overcharge and overdischarge, short circuit, over-current protection function, to avoid burning and explosion danger.
2) IC (Protection IC): the protection of the main protection design scheme of chip, batteries overcharge, over discharge, short circuit and other functions of the online monitor, the core work in safe and stable and efficient in.
3) temperature switch: mainly for temperature protection function design. When the temperature of the battery itself reaches 70 + 5 degree range due to other abnormal problems, the temperature switch acts to protect the temperature.
4) polymer lithium ion electric core: 402060P/450mAh/3.7V, Li-, Polymer, cell.
5) field effect transistor (MOSFET): MOSFET tube, in the protection circuit switch function, always make the voltage on both ends of the load will not rise, will not reduce, ensure voltage stability.
6) battery package: PVC heat shrinkable