Design scheme of battery for digital flat panel detector

Introduction to Application Host: The 1800R digital flat panel detector is a multifunctional flat panel X-ray imaging device, which adopts advanced design and processing technology such as amorphous silicon thin film transistor (TFT), photodiode (PD) array, and direct coupling of high-sensitivity cesium iodide (CsI) fluorescent material. The product can be widely used in fields such as medical diagnostic imaging systems, industrial non-destructive testing, and safety inspections. The thickened cesium iodide fluorescent material combined with optimized low system noise (equivalent to about 8 nGy) enables this detector to achieve excellent image quality even under low-dose conditions. The direct growth of cesium iodide process combined with an effective shooting size of 17 "× 17" (43 x 43cm) is applied to high-quality ordinary digital photography.

Battery Introduction:

1、 Product functional parameters:
This digital flat panel detector battery integrates various functions such as microcontroller software controlled power measurement, hardware protection circuit, software secondary protection, temperature acquisition, voltage acquisition, current acquisition, etc.
Design requirements for lithium battery pack models: ATL4960123P-4S/4Ah/14.8V/59.2Wh。
Input and output characteristics: The input and output use the same port and adopt the automatic switching function between input and output.
1. Input feature: In the presence of mains power, the mains power can supply power to the host while charging the lithium battery pack.
2. Output characteristics: In the absence of mains power, the battery will automatically output a voltage of 14.8V to supply power to the host, in order to meet the normal use of the host.
3. State characteristics: The input/output state is automatically switched through a conversion circuit, and there will be no phenomenon of motherboard shutdown or restart due to delay.
Electricity metering: By using microcontroller software to control the circuit, the current accurate electricity level of the battery can be displayed in real time.
Basic characteristics of protective board
1. Single section overcharge protection voltage: 4.28 ± 0.05V
2. Single section overcharge recovery voltage: 4.15 ± 0.05V
3. Single section over discharge protection voltage: 2.60 ± 0.10V
4. Single section over discharge recovery voltage: 3.00 ± 0.10V
5. Combination battery overcurrent protection value (22ms): 7-10A
6. Combination battery charging over temperature protection value (recoverable): 65 ± 5 ℃
7. Combination battery discharge over temperature protection value (recoverable): 75 ± 5 ℃
8. Finished batteries also have short-circuit protection.
Design requirements for battery cycle life: 300-500 times (according to national charging and discharging standards)
Design requirements for battery external dimensions: refer to the actual size of the battery casing.

2、 Product Design Proposal:

1) Energy metering communication function module: By monitoring various data of the battery through microcontroller software, calculating the remaining power of the battery, achieving real-time communication with the host, and feeding back various information of the battery to the host.
2) A protection module that combines software and hardware: mainly designed for the protection circuit of rechargeable lithium battery packs. Due to the chemical characteristics of lithium batteries themselves, it needs to provide protection functions such as overcharging, overdischarging, short circuit, overcurrent, and overheating to avoid hazards such as combustion and explosion. This battery is designed with a hardware protection circuit and a microcontroller software secondary protection method, ensuring greater safety and security.
3) Protection IC: The main protection function chip of the design scheme, which performs online real-time monitoring of overcharging, overdischarging, overcurrent, short circuit and other functions on the battery cell, ensuring that the battery cell operates within a safe, stable and efficient range.
4) NTC: Mainly designed for temperature protection function. When the temperature of the battery itself encounters problems due to other abnormalities, the NTC for temperature protection is activated to achieve temperature protection. The over temperature protection value for charging is designed to be 65 ± 5 ℃, and the over temperature protection value for discharging is designed to be 75 ± 5 ℃,
5) Selection of battery cells: This project uses the most well-known ATL lithium polymer battery cells/4960123P/4000mAh/3.7V in China.
6) Field Effect Transistor (MOSFET): A MOSFET transistor that serves as a switch in protective circuits.
7) Connector: It contacts the host through metal sheets.
8) Battery casing: Adopting PVC heat shrink packaging and high-end aluminum alloy casing to form the overall battery mold.