How to design portable batteries

　　Author ：Iflowpower – Portable Power Station Supplier

Not only is portable entertainment equipment and handheld products, but also use in green products, such as photovoltaic, PVs, EVEM (Electricalvehicle, EV), etc. In addition to security, cost, and size, the runtime of the battery is maximized and extended, and the system design of battery power is also extremely important. With the increase in battery technology used to drive portable use, select the appropriate approach to discharge and charge the rechargeable battery.

This article first reviews the general battery strategy suitable for portable use, and then discusses power management and battery management circuit design using today's integrated processing methods. Important battery technology battery technology can be simply divided into two categories: non-chargeable and rechargeable type. The non-rechargeable battery is used after use, called a disposable battery.

Alkaline batteries are the most common home disposable batteries. Alkaline rechargeable batteries are also available on the market, but not within the discussion of this article. Typical alkaline batteries have a floating voltage of approximately 1.

5V to 1.65V. The nominal voltage is 1.

2V. The voltage at the end of life is about 0.9V.

The voltage at the end of the single alkaline battery life can be as low as 0.7V-0.8V.

, Detailed depending on the load current. Table 1 shows some common alkaline battery configurations. Some uses can be used in a variety of configurations, depending on the product profile, system requirements, available processing methods and power calculations.

For example, the operating voltage range of some wireless photovoltaic mouse processing method is 1.8V to 3.2V.

The mouse uses the alkaline battery configured for 2 series to work properly without an additional regulator power supply. If you want a very compact mouse design, then 2 AA / AAA alkaline batteries may not apply. In this case, a single AA / AAA alkaline battery can be used to reduce the occupancy space, but the voltage is rised to 1.

8V with a boost converter. Table 1: Comparison of alkaline battery configurations The rechargeable battery is considered to be a secondary battery, and the amount of power can be restored to the original state each time it is used until the battery life is over. This paper will be described as an example with a lithium ion battery (Li-ION), a lithium polymer battery (Li-poly) and nickel-hydrogen batteries (NIMH).

NiMH batteries are good alkaline battery alternatives because their shape and operating voltage are similar to alkaline batteries. One disadvantage of traditional nickel hydrogen batteries is that the self-discharge rate is high (about 20% per month, as shown in Table 2), but there is a leading battery manufacturer has overcome this difficult relationship, its launched nickel-hydrogen battery series is machining 12 months later maintained at least 85% capacitance. Restoring the amount of electricity of the nickel-hydrogen battery has a simple and low cost treatment, but the embedded charger using a dual cut-off charging method (specified by the charging current and working environment) will achieve optimal performance.

Dual cut-off charging method combines the characteristics of temperature increases with time and voltage over time (or unchanged). Table 2: Comparison of battery chemical properties The lithium-ion battery is currently considered to be mature battery technology, which has been widely used in mobile phones and cars, as compared with ten years ago, which is lower and better performance. When designing multi-section battery systems, a battery with a single nominal voltage is 3.

6V has a huge advantage, which can reduce the number of battery segments of 2/3. Lithium-ion batteries in quality and volume high energy density make it suitable for multiple portable use, such as personal media players or wireless Bluetooth headphones. However, to supply protection circuits to minimize the dangers (such as overchard or overheating) that may cause lithium ion batteries.

The lithium-ion battery has a relatively long service life (can charge 500-1,000 times), if the battery is charged every day, it is necessary to change after 12 years. Design a reasonable lithium-ion battery power management system will extend battery life and improve the reliability of the entire system. .