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The 14 series of batteries were soaked in water on rainy days. The initial measured total voltage was 47V, but after more than 3 hours of charging, they could not be fully charged. The measured voltage for a single series was between 3.98 and 4.0. Today, I replaced a second-hand protective board on Taobao, and the electric car can run. However, during charging, I found that the charger fan did not turn, with one red light and one green light, and I still couldn't charge it.

2、 Dear experts, could you please guide me on this protective board that I bought? Do you still need to discharge the battery clean before charging to restore normal operation?

3、 Addendum: I just measured that the voltage of the charger is 59.4V, and the voltage of the battery charger plug is 54.5V.

4、 The Taobao store owner who sells protective boards told me that I can charge the battery after it has been fully charged.

Scrapped, the lithium battery will short circuit inside after being flooded, the battery will be scrapped, and the protective board will be scrapped.

I suggest you find an electrician to help you test the lithium battery. If there are any abnormalities, do not use it, as it can cause short circuits and damage the battery in water, and there is also a risk of use.

Lithium battery protection board is used for charging and discharging protection of series connected lithium battery packs; When fully charged, it can ensure that the voltage difference between individual batteries is less than the set value (generally ± 20mV), achieving uniform charging of each individual battery in the battery pack, effectively improving the charging effect under series charging mode; Simultaneously detecting the overvoltage, undervoltage, overcurrent, short circuit, and over temperature status of each individual battery in the battery pack to protect and extend the battery's service life; Undervoltage protection prevents each individual battery from being damaged due to over discharge during use.

The finished lithium battery consists of two main parts: a lithium battery cell and a protective plate. The lithium battery cell is mainly composed of a positive electrode plate, a separator, a negative electrode plate, and an electrolyte; The positive electrode plate, separator, and negative electrode plate are wrapped or stacked, packaged, filled with electrolyte, and packaged to make the battery cell. Many people are unaware of the role of lithium battery protection plates. Lithium battery protection plates, as the name suggests, are used to protect lithium batteries. The role of lithium battery protection plates is to protect the battery from over discharge, over charge, and over current, as well as output short circuit protection:

Short circuit protection function: It can protect and self recover when the load is disconnected.

Main functions: overcharge protection, over discharge protection, short circuit protection, overcurrent protection, over temperature protection, and balance protection.

Interface definition: The charging and discharging ports of the board are independent of each other, and they share the same positive pole, B - is the negative pole connected to the battery, C - is the negative electrode of the charging port; P - is the negative electrode of the discharge port; B -, P -, and C-pads are all through-hole type, with a hole diameter of 3mm for each pad; The charging detection interfaces of the battery are output in the form of DC needle holders.

Parameter Description: Configuration of maximum working current and overcurrent protection current values, unit: A (5/8, 8/15, 10/20, 12/25, 15/30, 20/40, 25/35, 30/50, 35/60, 50/80, 80/100), special overcurrent values can be customized according to customer requirements

D CurrentGain calibration and reading comparison - CurrentCalibration

2、 Matrix characteristics section:

3. Open circuit voltage test: After measuring the loading voltage, Can the MOS transistor be opened normally;

4. Load voltage test: Measure the load capacity of the protection board to reflect the protection DC impedance

5. VCC voltage measurement (whether the working voltage of the chip is normal)

6. Measurement of the operating frequency of the chip (the operating crystal oscillator frequency of the chip)

7. Conduction resistance measurement (MOS tube and FUSE resistance measurement);

8. Identification of resistance - IDR measurement;

9. Thermistor - THR;

10. Normal state static power consumption current&sleep static power consumption (sleep)

11. The static power consumption current in the shutdown state;

3： Protection characteristic section test: [1]

12. Single battery overcharge protection test (COV),

A. Lower limit of protection: Test whether the protection board protects in advance, which affects the battery capacity value;

B. Protection upper limit: Test whether the protection board has protection, which affects the safety of the battery;

C. Upper and lower limits of protection delay time: whether the protection delay time is within the design range;

D. Recovery test: Whether it can be restored after protection is related to whether the battery can be used again.

13. Single battery over discharge protection test (CUV);

A. Upper and lower limits of protection value: one is whether the battery can be placed at the lowest value, whether the capacity can be fully discharged, and the other is that it must be protected, otherwise it will affect the battery's lifespan;

B. Protection delay time: Is the protection delay time within the design scope,

C. Recovery value and recovery time: Whether the battery can be restored after protection is related to whether it can be reused.

14. PACK battery overvoltage protection test (POV) protection value, protection delay time, recovery value, recovery time (if COV is tested,...), POV does not need to be tested, and it is generally not recommended to only test POV, because even if the POV of the overall group is protected, it does not mean that every section can be protected. If a certain section is not protected, it can be very dangerous

15. PACK Battery Low Voltage Protection Test (PUV); Protection value, protection delay time, recovery value, and recovery time; The principle is the same as CUV, CUV has tested CUV, but PUV is not tested, for the same reason as POV;

16. Charging overcurrent protection (OCCHG);

A. Upper and lower limits of protection values: If the current is too small, it is related to charging time; if the current is too large, it is related to battery life;

B. Protection delay time: It is related to the issue of the battery heating causing the protection board to burn;

C. Recovery value and recovery time: battery reuse;

17. Discharge overcurrent protection (OCDSG);

A. Upper and lower limits of protection values: It is important to prioritize excellence, and the lower limit should not be protected in advance, otherwise it will affect power, slow running of the car, inability of electric tools to rotate, etc. The upper limit must be protected, and failure to protect may lead to problems such as motor burning and battery heating;

B. Upper and lower limits of protection delay time: This is also quite important. The lower limit is not protected. If it is protected in advance, electric tools may not tighten properly; If the upper limit is not protected, it may cause problems such as motor burning and battery heating;

C. Recovery value and recovery time: affecting battery reuse;

18. Locked rotor current test; Protection value, protection delay time, recovery value, and recovery time (electric tools should be quite important)

19. Short circuit protection test - (Shortcircuit protection), which is generally difficult to test and may damage protective devices

20. Charging over temperature protection test and recovery test;

21. Discharge over temperature protection test recovery test;

22. Recovery test for low-temperature protection during charging;

23. Discharge over low temperature protection test recovery test;

4： Balance function test:

Test whether the balance function of the protection board can be activated, and check the balance current value of each section;

5： Pre charge control:

24. Pre charge test - USDPC;

Overdischarge protection: When the battery is about to run out of battery power and the voltage reaches a required minimum value, the protection board will also close and cannot be discharged. As a result, the product will automatically shut down, forming an over discharge protection effect.

Overcharge protection: When the voltage reaches the highest voltage of the battery (4.2V) while charging the product, the protection board will automatically shut off and display that it is fully charged and cannot continue charging. A type of overcharge protection effect formed.

Short circuit protection: When the battery is accidentally short circuited, the protection board will automatically close within a few milliseconds and will not be powered on. At this time, even if the positive and negative poles touch each other, it is fine, forming a short circuit protection that will not cause an explosion event.

Overcurrent protection: When the battery is discharged, the protection board will have a maximum limit current, which is different for different products. When the discharge exceeds this current, the protection board will also automatically close

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