Several wiring methods of lithium battery protection board

Lithium battery protection board is the charge and discharge protection of lithium battery pack connected in series; it can ensure that each monomer battery voltage difference is less than the set value (plus or minus 20 mv) during charging, and realize that each battery monomer battery balance charge, which effectively improves the charging effect of serial charging mode; At the same time, detect every single battery in the battery pack of 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 avoid damaging during using 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.

The connecting way of lithium battery protection board

Lithium battery protection board has two kinds of design methods, respectively is the positive plate and negative plate, the principles and purposes are the same, but the device does not support by software to modify the positive and negative protection board Settings, so only through a physical connection to determine right protection way, the software used at the same time is also different, respectively introduce two kinds of protection plate under the connecting method and operation method.

Lithium battery protection board several connection methods is introduced

Battery protection board connection protection plate is usually used with the cathode plate with the mouth, the cathode plate mouth, the anode with three mouth board, other ways differ a tautology, detailed as follows:

There are some lithium ion batteries third line is the temperature protection, some are battery information check line (such as changed the original battery to prompt alarm).

Lithium ion batteries are + battery protection board.3 lines will only appear on the protection board, the battery will never only two wires.

There are two kinds of lithium ion battery, obvious 3.7 V is iron and aluminum phosphate, can be in directly.

Replacement is very simple is cathode) (note:

1: the battery packaging tear down, and then soldering iron to separate and battery protection board.

2: the same then pulled down your new battery protection board, the battery from the protection of the old board.

Wiring principle diagram

1, connect the battery protection board connection order: a special note: being different manufacturer line is not general, be sure to use supporting row line: 1) pick up before to ensure no insert rows of rows of protection plate;(2) to protect the board B - line (blue line) welded to the battery always negative;(3) rows of fine black line connection B - start, 2 lines (red line) connected 1 battery positive electrode, followed by connecting each string of the positive pole of the battery, until finally a bunch of B +;(4) after the ribbon cable connected don't plug directly into protection board, the measurement on the back of the plug between every two adjacent metal terminal voltage, if it is 3 yuan polymer battery voltage should be between 2.8 ~ 4.2 V lithium iron batteries should be between 2.5 ~ 3.65 V, lithium titanate battery should be between 1.6 ~ 2.8 V;(5) ribbon cable connection, when confirmed order and voltage again insert protection board socket

Lithium battery protection board wiring tutorial

2

Wiring is completed: measuring the battery B +, B - voltage and P + P - voltage are equal, equal protection board to work properly, namely can normal use. If not equal, please follow the above connection in order to check it again.PS: with the mouth and pick up points at the mouth of the wiring method is the same, the difference is that they discharge (load, motor) and charge method is different. With the mouth of the charge and discharge the cathode is in the P - online; Points is charging line up in C - online, discharge the P - line.

Lithium battery protection board wiring tutorial

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The actual case of schematic illustration for 7 series of battery (for example)

1. Pick up before wiring to ensure no insert rows of protection plate;

Lithium battery protection board wiring tutorial

2. Will protect the board B - line (blue line) welded to the battery is always negative

Lithium battery protection board wiring tutorial

3. Rows of fine black line connection B - start, 2 lines (red line) connection string of 1 the battery anode, followed by connecting each string of the positive pole of the battery, until finally a bunch of B +;

Lithium battery protection board wiring tutorial

4. 1, through the use of multi-meter black pens and pin B - line terminal and multi-meter red pens and pressure letter B1 line terminal, 1 series of battery voltage is 3.584 V.

2, by using a multi-meter black pens and pin letter B2 B1 line terminal and multi-meter red pens and pressure line terminal, 2 series of battery voltage is 3.584 V.

3, through this method, it is concluded that:

1 series battery voltage: 3.584 V

2 series of battery voltage: 3.584 V

3 series battery voltage: 3.585 V

4 series of battery voltage: 3.585 V

5 series of battery voltage: 3.583 V

6 series battery voltage: 3.583 V

7 series battery voltage: 3.584 V

The 7 series voltage is 3.58 V, row line connection is correct, and the battery voltage is lower than 0.002 V, the battery good consistency.

Lithium battery protection board wiring tutorial

Lithium battery protection board wiring tutorial

Lithium battery protection board wiring tutorial

Lithium battery protection board wiring tutorial

5. Ribbon cable connection, when confirmed order and voltage again insert protection board socket;

Lithium battery protection board wiring tutorial

6. Through B - line is connected, measuring B - and battery total anode voltage and P - and total positive voltage

Voltage, normal protection board (protective plate is equal to the switch, the switch is on, current safety through)

Sample test:

B - to total anode voltage is 25.11 V battery

P - to total anode voltage is 25.11 V battery

Two voltage agreed protection plate is normal. If P - through the large current discharge, there will be a slight pressure drop, protective plate fever (50 degrees), belongs to the normal phenomenon.

Lithium battery protection board wiring tutorial

Lithium battery protection board wiring tutorial

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With mouth protection plate connection application example

1. Battery protection board followed well, after the us to meet a good charge and discharge line

Lithium battery protection board wiring tutorial

2. Red that line in the charging line received battery total on the anode wire (load) to the red that thread received battery anode

Lithium battery protection board wiring tutorial

3. The black line in the charging line from the P - line in lithium battery protection board set the root wire (load) in the black line after the P - line in lithium battery protection board

Lithium battery protection board wiring tutorial

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Mouth protection plate connection application example

1. Red that line in the charging line received battery total on the anode wire (load) to the red that thread received battery anode

Lithium battery protection board wiring tutorial

2. The black line in the charging line from the C - line in lithium battery protection board set the root wire (load) in the black line after the P - line in lithium battery protection board

Lithium battery protection board wiring tutorial

Matters needing attention

After wiring must be correct, wrong line will burn out protection board, so through repeated confirmation each string of battery voltage line voltage to ensure that there is no wrong.

If it is old batteries, battery voltage of each string is greater than 0.1 V, big differences of battery series is likely to have electricity, in the changes of capacitance and resistance, forming a barrel short board effect, cause the charging overcharge protection, discharge too quickly as the overcharge protection, simple to understand is the battery life is short, electric cars and other application scenarios using time is short.

Is to protect each string of battery protection board, either string overcharge or discharge can cause protection.

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