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Lithium ion common problems cause analysis and solution
Publish:Sino Energy Cooperation    Time:2016-09-10

With the high-speed development of science and technology level, the using range and function of lithium-ion batteries are self-evident, but in our daily life accident lithium-ion batteries 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. Low voltage charged inequalities caused

 

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. The storage time is too long

 

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

 

3. Abnormal heat resistance caused by large

 

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. When the lithium battery

 

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 expansion

 

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

 

3. The expansion cycle

 

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. The 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 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. When the spot welding

 

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. Worked as a blast

 

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. 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. Low environmental temperature is too low to cause 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.

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