Please tell me what is the principle of the battery anti-passivation function in the microcontroller and how to achieve it

一沙一世

Please tell me what is the principle of the battery anti-passivation function in the microcontroller and how to achieve it [Copy link]

 

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Please tell me what is the principle and how to implement the battery anti-passivation function in the microcontroller

maychang

{}What is the principle and how to implement the battery anti-passivation function in the microcontroller?}

I have never heard of this.

maychang

"What is the principle of the battery anti-passivation function in the microcontroller and how to achieve it?"

I’m afraid this chip is not a single-chip microcomputer?

Gen_X

Limited personal experience: This is a phenomenon in which the capacity of the battery decreases when it is fully charged for a long time or the cycle depth is not enough. In the past, nickel-chromium, nickel-metal hydride and even lead-acid batteries all had this phenomenon, but now lithium batteries are much better. As long as they are not over-discharged, this phenomenon rarely occurs.

1. Prevent long-term full-charge floating charge. When the CPU records that the discharge depth has not reached below 40% in the recent few times (for example, more than 5 times), and most of the time is in full charge or floating charge, it is forced to discharge deeply once, that is, to reach the normal charging condition but temporarily do not start the charging program until it is below 30%. When charging, use the pulse mode instead, and use a dummy load to do an "artificial" discharge cycle when necessary.

2. After using for many cycles, if it is found that the total charge is less than 97%, that is, the predicted capacity is not reached, switch to high current pulse charging and maintain 2-4 deep discharge cycles, that is, do not charge until the battery is used below 20%.

3. In the case of long-term floating charge but almost no discharge or very little discharge, it is necessary to "temporarily" stop charging or floating charge until the discharge drops below 30% and then start normal charging, and temporarily stop floating charge to reduce the "passivation" of the battery.

chunyang

Anti-passivation means regular deep discharge, which can be achieved by setting a long timer. If the MCU supports this function, it has a dedicated backup battery or data retention battery pin, and has a charging and discharging switching circuit inside.

tagetage

Battery passivation prevention means that if some batteries with passivation are used for power supply, if they are operated at ultra-low power consumption for a long time, such as a few microamperes, some batteries will be passivated and cannot release the working current normally. By configuring this register, the battery can be discharged at 1mA or 2mA to prevent the battery from passivation. In most cases, this function is not used. In actual use, it is only discharged for a few hundred milliseconds or a few seconds in a day. It is not always discharged.

tagetage

maychang published on 2022-11-17 17:07 "What is the principle of the battery anti-passivation function in the microcontroller and how is it implemented?" This chip is probably not a microcontroller?

It is a single chip microcomputer.

tagetage

Gen_X posted on 2022-11-17 17:35 Personal experience is limited: This is the phenomenon that the capacity of the battery will decrease when it is fully charged for a long time or the cycle depth is not enough. In the past, nickel-chromium, nickel-metal hydride and even lead-acid batteries, ...

This is not what anti-passivation means.

tagetage

Gen_X posted on 2022-11-17 17:35 Personal experience is limited: This is the phenomenon that the capacity of the battery will decrease when it is fully charged for a long time or the cycle depth is not enough. In the past, nickel-chromium, nickel-metal hydride and even lead-acid batteries, ...

The anti-passivation here does not refer to rechargeable batteries, but disposable batteries.

一沙一世

maychang published on 2022-11-17 17:07 "What is the principle of the battery anti-passivation function in the microcontroller and how is it implemented?" This chip is probably not a microcontroller?

Yes, it is a single chip microcomputer

LeoMe

tagetage posted on 2022-11-17 23:19 Battery anti-passivation means that if some batteries with passivation are used for power supply, if they are operated at ultra-low power consumption for a long time, such as a few microamperes, some batteries will become passivated...

Well, for disposable batteries, I agree with this statement. This method is often used in various sealed heat meters or water meters to prevent the battery passivation problem caused by long-term micro-current discharge to disposable batteries. The battery should be charged with a slightly larger current every once in a while.

tagetage

LeoMe posted on 2022-11-18 08:45 Well, for disposable batteries, I agree with this statement. This method is often used in various sealed heat meters or water meters to prevent long-term micro-electricity...

10 points for correct answers. It seems that you have relevant experience.

常见泽1

Early smart meters, because they had backup batteries, generally required a single-chip microcomputer to prevent the batteries from passivation.

Gen_X

tagetage posted on 2022-11-17 23:21 This is not what anti-passivation means.

Thanks, I thought it was a problem with the rechargeable battery. Learned.

tagetage

Common Ze 1 Published on 2022-11-18 09:59 Early smart meters, because of the backup battery, generally need to use a single-chip microcomputer to prevent the battery from passivation

10 points for correct answers. It seems that you have relevant experience.

azcazc

Thanks to the experts for sharing their knowledge. I learned a lot. It deepened my impression.

Honghuzaitian

Gen_X posted on 2022-11-17 17:35 Personal experience is limited: This is the phenomenon that the capacity of the battery will decrease when it is fully charged for a long time or the cycle depth is not enough. In the past, nickel-chromium, nickel-metal hydride and even lead-acid batteries, ...

I learned new knowledge. It was the first time I knew that a microcontroller had this function.