Smart Watch Polymer Battery Case Display

A smartwatch is a type of smartwatch with a built-in smart system, equipped with a smart phone system and connected to the network, which can use all functions. They can synchronize calls, text messages, emails, photos, music, and other calls. Smartwatches typically use high-performance polymer batteries to ensure continuous, efficient, and stable operation of the product. In order to meet the requirements of long-term reliability and safe use of users.

1. Battery design requirements for smartwatches

Design a battery pack that matches the host according to customer requirements and specifications, and incorporate polymer batteries and safety protection performance into the solution. In the entire design process of the plan, the goal is to achieve the most perfect integration with the host, ensure the safety of the battery, battery, and the entire system, and first meet the corresponding design and certification regulations. Thoughtful consideration. To ensure the safety and reliability of polymer batteries, it is necessary to integrate multiple layers of protection inside the battery pack to prevent lithium batteries from being damaged due to overcharging, over discharging, or short circuits.

1) Polymer battery model: 403040PL 3.7V 450mAh

2) Circuit design requirements.

1. Overcharge protection voltage for individual batteries: 4.30 ± 0.25V

2. 4.15 ± 0.50V

3. Single battery overload protection voltage: 2.8 ± 0.08V

4. Overdischarge recovery voltage of single battery: 3.00 ± 0.08V

5. Combination battery overcurrent protection value (10 milliseconds): 2-4A

6. The finished battery also has short-circuit and reverse charging protection.

7. Design requirements for battery cycle life: 300-500 cycles (according to national charging and discharging standards)

8. Design requirements for battery size: refer to the casing of the lobby computer

2. Smart watch battery design schematic

1) Protective Plate (PCM): It is mainly used to protect polymer batteries. Due to the chemical properties of lithium batteries, they must provide protective functions such as overcharging, over discharging, short circuits, and overcurrent to prevent combustion, explosion, and other hazards.

2) Protection IC: The main protective function chip in the design scheme, which monitors online the functions of overcharging, discharging, overcurrent, short circuit, etc. of the battery cells, ensuring their safe operation., Stable and effective range. At the same time, measure the battery capacity, temperature, remaining time alarm, and other parameters.

3) Polymer lithium-ion battery: 403040PL 3.7V 450mAh lithium polymer battery.

4) Field effect switching field-effect transistor (MOSFET): As a switch in the protective circuit, MOSFET will always prevent the voltage at both ends of the load from rising or falling, thereby ensuring voltage stability.

5) Battery packaging: sealed and connected to the host