After electric wrench battery gets into water, how do you repair the broken protection plate?

14 batteries get wet for a rainy day. Initial measurement of total voltage is 47V. After more than three hours charging, it can't charge normally. Measurement of single battery voltage is between 3.98-4.0. I changed a second-hand protection board on Taobao, and then the trolley can run, but I found that the charging fan does not work while charging. One is red light, and the other is green light. I think it is a charging failure.

Second, the masters, please instruct me, is I buy the protection board? Still need to put the electric clean again charge can return to normal?

Three, supplement: measuring just now, the charger voltage 59.4 V, the voltage 54.5 V battery charger.

Four, Taobao shop owner told me that sell protective plate, ran out of all the electric battery recharging.

The waste, the lithium battery after the water inside will short circuit, battery scrap, and protection board scrapped.

It is recommended that you find a electrician to help you lithium electricity pool test, if an exception is not used, because in the water will cause short-circuit damage to the battery, also there is the risk of use.

Lithium battery protection board is in tandem lithium battery pack the charge and discharge protection; Between charged can ensure each monomer battery voltage difference is less than the set value (plus or minus 20 mv) commonly, realize each battery monomer battery charge, effectively improve the serial charging mode of charging effect; At the same time detection of every single battery in the battery pack, overvoltage, under voltage, over current, short circuit, over temperature condition, protect and extend the service life of the battery; Under-voltage protection makes every single battery in discharge to avoid when using battery damaged because of over discharge.

Finished products of lithium battery mainly has two parts, and protection of lithium battery core board, lithium battery core is mainly composed of positive plate, diaphragm, negative plate, electrolyte composition; Positive plate, diaphragm, negative plate coil or cascade, packing and infusion liquid electrolyte, after packaging made from batteries, lithium battery protection board a lot of people don't know, the effect of lithium battery protection board, just as its name implies is to protect lithium batteries, lithium battery protection board's role is to protect the battery but put, but filling, but flow, and the output short circuit protection:

Short circuit protection function: can protect, disconnect the load can be recovery.

Main functions: the overcharge protection, discharge protection, short circuit protection, over current protection, over temperature protection function, balanced protection function.

Interface definition: the board of the charging port and discharge port are independent of each other, both the positive and B - for connecting the battery anode, cathode; C - for charging at the mouth of the P - for the cathode discharge mouth; B -, P -, C - welding plate are hole type, welding plate hole diameter is 3 mm; The battery's charging detection interface with DC needle base form output.

Parameters: maximum working current and over current protection current value configuration, unit: A (5/8, 8/15, 10, 20, 12/25, 15, 30, 20/40, 25/35, 30, 50, 35/50, 60, 80/80), special flow values can be customized according to customer's request.

Calibration and read value comparison, dc urrent Gain - Current calibration

Second, the matrix feature:

3. The open circuit voltage test: after the load voltage measurement, MOS tube whether can open normally;

4. The load voltage test: measuring protection plate on load capacity, reaction to dc resistance

5. The VCC voltage measurement (chips working voltage is normal)

6. The work frequency of the chip measurement (chips working frequency)

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

8. To identify the resistance - IDR measurement;

9. Thermistor - THR;

10. Normal static power current & dormant static power (sleep)

11, shut off (Shout down) static power current status;

Part three: the protective properties testing: [1]

12. Single battery overcharge protection test (COV),

A, lower limit of protection: test protection board protection ahead of time, whether affect battery capacity value;

B, protect cap: test protection board protection, affect the safety of the battery;

C, time delay between the upper and lower limit of protection: protection delay time is in the scope of design;

D, restore test: after protection, whether can restore, relationship between battery can use again.

13. The single battery discharge protection test (CUV);

A and protect the value of upper and lower: one is that the battery can be on the end of the value, capacity can be completely released, one is must be protected, otherwise affect battery life;

B, protection delay time: protection delay time is in the scope of design,

C, value recovery, recovery time: protection, whether can restore, relationship between battery can use again.

14. PACK battery over-voltage protection test (POV) protection value, the delay time, recovery value, recovery time (if there is a measuring COV, POV don't measure, is generally not only measuring POV, because the total set of POV even with protection, doesn't mean every day to protect, don't protect the one thousand has a section, it is very dangerous.)

15. PACK battery low voltage protection test (PUV);Protection value, protection delay time, recovery, recovery time; Principle with the CUV, CUV have test, but any PUV, reason with POV.

16. The charging over-current protection (OCCHG);

A and protect the value of upper and lower: current is too small, charging time, current is too large, relationship between battery life;

: relationship between B and protect delay battery fever akin to burning protection plate;

C, value recovery, recovery time: batteries used again;

17. Discharge over-current protection (OCDSG);

: A and protect the value of upper and lower limits is optimal for important, lower limit, can't advance the time protection, otherwise the influence power, car run fast, electric tools such as turn to be not moved, ceiling must protect, not protect lead to problems such as burning motor, battery heating;

: B, protecting the time delay between upper and lower limits are more important, the floor is not protected, if the protection in advance, electric tools, can lead to a screw is not tight; Ceiling does not protect, may lead to problems such as burning motor, battery heating;

C, value recovery, recovery time, influence the battery used again;

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

19. The short circuit protection test -- -- -- (Short circuit protection), generally difficult to test, can damage protection device

20. Charge over temperature protection test and recovery test.

21. The discharge temperature protection test recovery test;

22. The charging over temperature protection test recovery test;

23. The discharge temperature protection test recovery test;

Four: balance function test:

The balance of protection plate functional testing can start, test the balance of each section current value;

Five: prefi lled control:

24. Prefi lled test - UDPPC;

Put protection: when the battery power is about to run out, the lowest voltage to a requirement, protection board will be closed, cannot in the discharge, product so will automatically shut down, the formation of a discharge protection.

Overcharge protection, charging to the product, reaching the highest voltage of the battery voltage (4.2 V), power protection board will automatically shut down, show with no longer continue to charge. Form a kind of overcharge protection function.

Short circuit protection: when the batteries are not careful when short circuit, protection board will be automatically closed in milliseconds, in electricity, then across the electrodes is met a is also ok, formed a kind of short circuit protection does not cause the bombings.

Over current protection: when the battery is discharging, protection board has one of the biggest limit current. Different products have different limit current. When the discharge exceeds the current protection board, it will automatically shut down.

The page contains the contents of the machine translation.