Lithium battery common problems and solutions

With the rapid development of science and technology level,The lithium battery using range and function has been self-evident, but lithium in our daily life battery accident problem always emerge in endlessly, always haunt us, in view of this, small make up special finishing the reason of the lithium ion common problem analysis and solving measures, hope to provide convenience for you.

A, voltage, the individual is low

1.Self-discharge caused by low voltage

Big batteries self-discharge, make its voltage is lower than other fast, low voltage can be eliminated by storage after check voltage.

2.Charged inequality caused by low voltage

Battery testing when charged, because the contact resistance or inconsistent test tank charged current batteries charged.Stored in a short time (12 hours) to measure the voltage difference is small, but when long stored voltage difference is bigger, the low voltage and no quality problem, can be solved by charging.In production for over 24 hours after charged voltage measurement.

Second, the internal resistance is larger

1.Test equipment

If precision is not enough or not eliminate electrical contact group, will cause display internal resistance is big, should be used in ac bridge method principle, testing internal resistance testing instrument.

2.Storage time is too long

Lithium battery for too long, thereby causing loss to the capacity is too big, passivation, internal resistance, can be solved by filling put activation.

3.Caused abnormal heat resistance

Batteries in processing (spot welding, ultrasonic, etc.) make a battery abnormal heat, closes the diaphragm produce hot phenomenon, serious internal resistance increases.

Third, lithium battery

1.Lithium battery charging

Lithium-ion batteries in charging, lithium batteries will naturally produce inflation, but generally not more than 0.1 mm, but the charge will cause the electrolyte decomposition, internal pressure increases, lithium battery.

2.When processing inflation

Generally is the abnormal processing, such as short circuit and overheating, etc.) caused by excessive internal heat decomposition of the electrolyte, lithium battery.

3.Loop expansion

Cells in circulation, the thickness as the cycle number increases, basic is not increased, but after more than 50 weeks times the normal amount in 0.3 ~ 0.6 mm, aluminum shell is relatively serious, cause this kind of phenomenon belongs to normal cell reaction.But if increasing the thickness of the shell or reduce internal materials may be appropriately reduced inflation.

Four, battery power phenomenon after welding

Aluminum shell batteries after welding voltage is lower than 3.7 V, usually because of spot welding current is too large the batteries inside the diaphragm breakdown and short circuit, voltage drops too fast.

Is commonly caused by spot welding position is not correct, the correct spot welding position should be at the bottom or marked "A" or "-" side welding, no logo on the side and bedding face is not spot welding.Others is spot welding nickel with poor solderability, so must use large spot welding current, the internal high temperature resistant adhesive tape can not work, due to internal short circuit batteries.

Battery power after a spot welding is partly because of its high self-discharge battery itself.

Five, the battery explosion

Produce battery explosion in general have the following several ways:

1.The overcharge explosion

Protection circuit out of control or test tank is out of control charging voltage is greater than 5 v, cause the electrolyte decomposition, violent reaction, inside the battery internal pressure rise quickly, the battery explosion.

2.Over current explosion

Protection circuit is out of control or the test cabinet is out of control the charging current is too large to cause embedded lithium ion too late, and in the formation of lithium metal sheet surface, the membrane, are negative directly short-circuit explosion (rare).

3.When the ultrasonic welding plastic shell explosion

Ultrasonic welding plastic shell, the equipment makes the ultrasonic energy transferred to the battery core, ultrasonic energy is ambassador melt inside the battery diaphragm, directly across the short circuit, produce explosion.

4.Spot welding when the explosion

Spot welding current is too large when the explosion caused serious internal short circuit, in addition, the positive connection piece directly with negative associative when spot welding, that is negative direct short circuit after the explosion.

5.Discharge explosion

Electric battery over discharge or exile (3 c) easy to dissolve the cathode copper foil to the diaphragm is negative direct short circuit produce explosion (rare).

6.A vibration explosion falls

Batteries in a violent vibration or batteries caused by falls within plate dislocation, serious short circuit and explosion (rare) directly.

Six, low battery 3.6 V platform

1.Inspection ark sampling is not allowed or ark instability caused by low test platform.

2.The environment temperature is too low to cause low platform (discharge platform is highly affected by the ambient temperature)

Seven, improper processing

The positive connection piece (1) mobile hard spot welding caused the positive poor contact batteries, the batteries internal resistance.

(2) spot welding connection piece not welded, contact resistance is big, to make the battery internal resistance.

The page contains the contents of the machine translation.