3.7V-4.2V lithium battery charge and discharge protection chip?

燕园技术宅

3.7V-4.2V lithium battery charge and discharge protection chip? [Copy link]

 

I want to know what battery protection chips are used in the charge and discharge protection circuits of small-capacity lithium batteries such as 3.7V-4.2V in current wearable devices? I hope you can give me some advice and provide the manufacturer and model of the chip, thank you ! Because I have just come into contact with these power supplies, I don’t know much about them. Can the battery protection circuit detect the charging status and under-power (lack of power)? Or is there a special chip?

qiushenghua

Should I answer this or not... I'm struggling... We have a lithium battery protection IC that is still under testing... The most common lithium battery protection IC I've seen so far is DW01 (with various suffixes). Generally, lithium battery protection ICs are used for overcharge, over-discharge, and over-current protection, and the protection method is mostly to directly cut off the MOSFET. However, most of the ones I've come across are high-current (several A level). The current in wearable devices is so small, it's uncertain whether these protection ICs are still applicable...

qwqwqw2088

The original poster's requirement is a single-cell lithium battery protection IC. I recommend Seiko's S-8261, which is a general-purpose product. It is stable and reliable. You can find the s-82a1a series.

qwqwqw2088

If cost factors are taken into consideration, several domestic manufacturers now have protection chips that are also very useful HY2110. Japan's Ricoh also has a single-cell R5460, which is also used by many people

燕园技术宅

qwqwqw2088 Published on 2019-4-17 20:37 If cost factors are taken into consideration, the protection chips of several domestic manufacturers are also very useful. HY2110. Japan Ricoh also has a single-cell R5460, which is also widely used

Hello, can this protection chip detect low power? Just like our mobile phones, when it is lower than 20%, it will prompt that the power is too low. Is there such a chip that can detect low light, or is it all judged by detecting the overall power and then using the software to collect the voltage and current thresholds?

燕园技术宅

qiushenghua posted on 2019-4-17 19:46 Should I answer this or not? I’m struggling with this question. We have a lithium battery protection IC that is still under testing. The best I’ve seen so far is...

Thank you. Do you know what chips are there in our mobile phones or wearable devices that can detect low battery?

qwqwqw2088

Yanyuan Technology House published on 2019-4-19 08:25 Hello, can this protection chip detect low power? Just like our mobile phone, when it is lower than 20%, it will prompt that the power is too low. Is there any...

The protection chip only protects the battery from charging and discharging. It is for battery charging overvoltage, over-discharging to the minimum voltage during discharge, over-current protection, short-circuit protection function. Power detection is another circuit outside the protection circuit, or power chip, or voltage detection or charge monitoring.

qwqwqw2088

Power monitoring needs to be done with the help of MCU. There are also simple voltage detection pure analog circuits, such as the power detection on electric vehicles. The power detection of mobile phones is to detect the charge amount, monitor the charging and discharging current, and add software display

燕园技术宅

qwqwqw2088 Published on 2019-4-19 08:46 Power monitoring needs to be completed with the help of MCU. There are also simple voltage detection pure analog circuits, such as the power detection on electric vehicles and mobile phone power detection. It detects the power...

That is to say, a battery fuel meter or coulomb meter is used, and then combined with MCU for calculation and judgment to complete the low power detection and warning function! Is this the only method with the most applications?

qwqwqw2088

Yanyuan Technology House published on 2019-4-19 09:10 That is to say, a battery fuel gauge or coulomb meter is needed, and then combined with MCU for calculation and judgment to complete the low battery detection and warning function! This is the only way...

Coulomb metering is a more accurate and intelligent method, so it is more complicated. TI's BQ series has more chips that can be used. The voltage detection method is also commonly used. They are all general purposes, such as mobile lighting fixtures. If you need to know the remaining power, you can use LM324 to easily achieve it.

燕园技术宅

qwqwqw2088 Published on 2019-4-19 10:19 Coulomb measurement is a more accurate and intelligent method. TI's BQ series has more chips that can be used. The voltage detection method is also often used...

Thank you for your guidance.