Lithium battery, do you have to protect the circuit before you can use it?

1. Lithium iron phosphate batteries have protection plates, but they are mostly used in series circuits, and they are generally used in 3 strings of upper protection plates.

2. Charging must not rely on the action of the protection board, the over-discharge and over-charge setting range of the general protection board is beyond the normal use range of the battery, and the role of the protection board is only to prevent it

3. Lithium iron phosphate needs a dedicated charger.

However, generally good lithium battery chargers will have a transfer switch for lithium iron phosphate.

The constant voltage power supply charging is absolutely not possible, the front part of the lithium battery is charged with constant current, and the direct loading voltage is too high, and it is very likely to exceed the battery charging current.

5. The charging cut-off voltage of lithium iron phosphate is the rated voltage, which is the nominal discharge cut-off voltage, and the safety of lithium iron phosphate batteries is better than that of ordinary lithium-ion batteries

Lithium battery charging must not use constant voltage directly, lithium battery internal resistance is small, direct loading voltage, approximate and power supply disconnection, 317 terminal voltage must drop, resulting in inability to charge, to ensure the voltage to increase the power capacity, lithium battery can not stand to play with lithium battery charger to know, during the constant current charging, the power supply voltage and the actual battery voltage gap is very small, generally not exceeded.

It is best to have a protection circuit, if it is a bare battery (no protection circuit), it is best to connect a resistor in series when charging, and the charging current is about 10% of the battery capacity;

For example, for a 2000mAh (mAh) battery, the full charge current should not be greater than 200mA (= 2000 10).

There is no protection board to charge, and it can be safely charged with a dedicated charger with charge cut-off voltage protection.

The protection board is to protect the battery, so that it does not appear overcharge, overdischarge, short circuit and other problems, since the protection board is so important for the safety protection of the battery, then why do some people think that the lithium battery can not use the protection board?

As for the idea why someone will produce lithium batteries without protective plates, a big reason is the emergence of lithium iron phosphate batteries. Because there is news that lithium iron phosphate batteries are not afraid of overcharging and overdischarging, there is an argument that lithium batteries can be ignored without protective boards.

However, so far, there have been no battery manufacturers who have publicly stated that they do not use protective panels. Since everyone has a controversy about this issue, let's first return to the protection board itself, back to its definition and usefulness, in order to have our own views on whether lithium batteries can not use protection boards.

The lithium battery protection board is a charge and discharge protection for the series lithium battery pack. When fully charged, the voltage difference between each single cell can be guaranteed to be less than the set value, and the uniform charging of each single cell in the battery pack is realized, which effectively improves the charging effect under the series charging mode.

At the same time, the over-voltage, under-voltage, over-current, short circuit and over-temperature states of each single battery in the battery pack are detected to protect and prolong the service life of the battery. The under-voltage protection enables each single cell to avoid damage to the battery due to over-discharge when it is discharged.

Dear I am glad to answer for you: how to untie the protection of the lithium battery protection board Answer: Pro, the automatic charging protection of the disconnected load is protected, and the protection can be released by discharge; Discharge protection, charging can be released protection; Short-circuit or over-current protection, the disconnected load is automatically released, and the charging that cannot be automatically released can be released.

How to remove the current limit protection of the lithium battery protection board? The lithium battery protection board cannot be released from the current limit protection. Lithium batteries can be broadly divided into two categories:

Lithium metal batteries and lithium-ion batteries. Lithium-ion batteries do not contain lithium in a metallic state and are rechargeable. The fifth-generation product of rechargeable batteries, lithium metal batteries, was born in 1996, and its safety, specific capacity, self-discharge rate and performance** ratio are better than those of lithium-ion batteries.

Due to its own high technical requirements, only a few companies in a few countries produce this lithium metal battery.

The charger can charge and discharge B+ and B-, but not P+ and P-, indicating that the protection board is broken.

It can be used when you absolutely guarantee that the battery is not overcharged, not discharged, and not short-circuited. But once the short circuit is still dangerous, it is easy to **. The damage of the protection board is generally due to the burning of the discharged main MOS, the main reason is that the manufacturer has poor design and the short circuit is not up to par.

When the battery voltage is between to, the first and third pins of DW01 output high levels (equal to the supply voltage), and the voltage of the second pin is 0V. At this time, the voltage of the first and third pins of DW01 is added to the fifth and fourth pins of 8205A, respectively.

The two electronic switches within 8205A are both in the conduction state because the G pole accepts the voltage from DW01, that is, the two electronic switches are in the open state. At this time, the negative pole of the battery is directly connected to the P-terminal of the protection board, and the protection board has a voltage output.

First of all, the ternary parameter: usually, iron-lithium is.

1. Voltage overcharge, overdischarge, overcurrent, short circuit, and overtemperature.

2. Use a multimeter to measure whether the charging and discharging MOS tube is open.

3. If the lithium battery protection board has LEDs and cannot be charged and discharged, the LEDs will flash and alarm in seconds.

4. When the lithium battery protection board has an upper computer, it can be connected to the upper computer to check the protection status.

5. There is a weak switch on the lithium battery protection board, please check whether the weak switch is turned on.

If any of the above problems occur, then you can repair them according to the following methods.