It can be divided into the following reasons: the charger is connected in reverse or the charger is defective; the protection of the protection panel is not restored or the protection panel is defective; the lithium battery and electrical appliance are externally short-circuited; .
When dealing with the above unwanted phenomena, check in order: whether the charger is connected backwards, whether the positive and negative plugs of the lithium battery are connected backwards ; restart the electrical appliance to remove the protection panel; protection and measure whether the MOS tube of the protection board is energized; Look for loose or disconnected wiring connections.
The main reasons why the electric vehicle lithium battery cannot be charged
1 Check whether the circuit connection is intact and whether the charger is mixed
.When loadinglithium battery of an electric vehicle, check whether the plug and charging cable are working properly to avoid charging failure due to malfunction or loosening of the plug. When charging, use the charger suitable for the electric vehicle itself to avoid jointly using chargers of other car models and models, which may make charging ineffective.
2. The battery is seriously bulged, preventing the electric vehicle from charging.
You can first measure the bulged battery to check whether it can be reused. How to fix it? Open the battery case, open the closed cover of the battery fill hole (do not lose the rubber cap on the fill hole), and observe if there is still liquid. Use a syringe to draw 5-10ml of distilled water, add it into the injection hole, and gradually add it until the liquidjust covers the electrode plate. It would be better if there was a water level indicator outside.
3. The lithium battery has been left for too long, making the power loss voltage too low and the charger cannot charge Lithium batteries for electricity. Vehicles will suffer serious damage if not used for a long time. What's more serious is that the battery enters a dormant state and cannot be used normally, or more seriously, the battery fluid dries up. For this kind of situation, the easiest way is to try charging with a lower model charger first, then switch to the original charger once the voltage comes back up.
4. There is a problem with the battery charging IC or BMS system
Due to cell imbalance and other reasons, the lithium battery management system has problemsproblems, which causes error in judgment by the management integrated circuit and cannot be detected in voltage or current.
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Why can't lithium batteries be charged if not used for a long time?
The cathode material itself is highly dissipative and will generate a large amount of heat during charging, causing internal overheating. Excessive charging current will increase heat and endanger battery safety. When charging, you should try to avoid high current charging which will also increase the wear and tear of the battery, thereby affecting its lifespan. . It is best not to charge with high current. Lithium iron phosphate battery is the most popular lithium ion battery as of February 24, 2023. It is a lightweight, small energy storage device with high energy density and long service life.
Lithium batteries discharge automatically. If the battery voltage is lower than 3.6V and is not used for a long time, the battery will discharge too much and damage the internal structure of the battery. battery, thereby reducing battery life. Therefore, lithium batteries stored for a long time should be recharged every 3 to 6 months, that is, charged to a voltage of 3.8 to 3.9 V (lithiumThe optimal storage voltage of the battery is approximately 3.85 V) and should not be fully charged.
Detailed information:
Lithium-ion batteries must maintain an operating voltage minimum at all times. Above time, low voltage over-discharge or self-discharge reaction will cause lithium-ion active materials to decompose and destroy, and may not be able to be restored.
All fHowever, overcharging lithium-ion batteries will cause serious damage to battery performance or even explosion. Lithium-ion batteries should avoid overcharging the battery during the charging process.
Do not frequently discharge or deeply charge. However, every 30 charging cycles, the power detection chip will automatically perform deep discharge and deep charge to accurately assess the battery condition.