How to repair the abnormal protection panel of 12v lithium battery pack

　　Some people buy an electric car and don't use it for a long time. After a few months of riding, they find that the electric car is dead and can't be charged. Plug in the charging head, the signal indicator light is always green, this is because the lithium battery voltage is too low, and the charging head output voltage difference is too much.

　　In such cases, the rechargeable battery is generally said to be "starved". Such rechargeable batteries are usually replaced by new rechargeable batteries when they are sent to the after-sales service management center. Several ways to save the use of this battery.

　　1. Series method.

　　A 12 volt rechargeable battery with all working standard voltages is connected to a fully rechargeable battery. For example, the original 48v20ah rechargeable battery was connected to a 12v20ah rechargeable battery. The high-power 12V RECHARGEABLE battery can continuously improve the working standard voltage of all rechargeable batteries, and then use the initial charging plug to charge the battery, plug into the charging plug, charging plug signal light, and then charge the battery. When the plug is converted into a signal indicator, the rechargeable battery is removed from the rechargeable battery. All general rechargeable batteries.

　　2. Parallel method.

　　For example, the original 48v20ah rechargeable battery, in addition to a series of 48v20ah rechargeable batteries, the high operating standard voltage end will be introduced to the low operating standard voltage end. This kind of method is also used by many rechargeable battery car lithium ion battery agent to check that there is no rechargeable battery completely, and can also be used as the arrival station for battery charging.

　　3. Low voltage charging method.

　　Battery charging is carried out with a small and medium-sized charging plug. For example, 60v20ah rechargeable battery, if the application of 48v20ah charging plug battery charging. It is generally covered.

　　The above methods require professional staff to operate the whole process, because of the high specificity of lithium batteries, in order to avoid the operation process is not standard, resulting in risk, due to small loss.

　　12v lithium battery is obtained by several lithium battery connected close to 12v working voltage, and we must be connected to the 12v lithium battery protection board, it can maintain the lithium battery string. When the lithium battery is filled, it can have the effect of charging the working voltage difference of each individual lithium battery equally, and reasonably deal with the system loopholes of the series circuit. So when the protection panel of 12v lithium battery pack is abnormal, how to repair it?

　　Examples of some common problems of lithium battery protection plate to carry out analysis and maintenance.

　　I. There is no working voltage or abnormal voltage

　　No working voltage and working voltage of abnormal condition, you should dispatch digital multimeter to dc 20 v block, then the electricity meter with red brush touch batteries, lithium-ion batteries are level, colored watt-hour meter brush touch lithium batteries negative level, if digital multimeter display information without working voltage and working voltage is very low, then confirm the damage of lithium batteries. Pay attention to check whether the positive and negative of the lithium battery protection board is reverse connected. If the connection is wrong, the charging head is equivalent to the mandatory deficit when charging the lithium battery.

　　Two, no over current protection

　　There is no over current protection and other conditions, the first to inquire over the current test foot power circuit is not poor, if there is a replacement maintenance IC.

　　Three, no resistance or resistance is too large

　　It IS NECESSARY TO FIND OUT THE REASON FROM THE DISCRIMINATING POWER CIRCUIT OF THE RESISTANCE WELDER DISK, and INQUIRE WHETHER THE DISCRIMINATING resistor is in POOR contact, whether THE resistor is WRONGLY attached, whether there is a SHORT circuit fault or lead, etc.

　　Four, can not charge

　　The application of digital multimeter power switch to select 20v gear, then touch the lithium cell with a bright red watt-hour meter pen or lithium battery protection board, if the digital multimeter display information has a working voltage, you need to carry out analysis according to the following situation: is there an output voltage? Lithium cell working voltage is not attributed to all normal conditions. If the working voltage is abnormal, we will be able to distinguish the basis of maintenance IC or MOS tube has been destroyed, then to carry out the dismantling of the two components can be.

　　Five, no internal resistance or internal resistance is too large

　　1. If there is no internal resistance, it is necessary to inquire whether the foot position of the mos tube is damaged. If so, it is OK to replace the mos tube.

　　2. If the internal resistance is too large, then it is necessary to use the probe to touch the electric fish lithium battery protection plate, to check whether there is no bad contact phenomenon or too much air oxidation. It is also necessary to check whether the lithium cell is added with more nickel sheet. If the total number of nickel sheets on the lithium cell is too much, the internal resistance will be too large.

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