Detailed analysis of common problems of lithium ion batteries and solutions

Autore: Iflowpower – Fornitore di stazioni di alimentazione portatili

The voltage is inconsistent, and individual is low. The self-discharge is largely lowered from discharge, so that the voltage reduction is lower than the other fast, and the voltage is low can be eliminated by the storage post-inspection. 2.

When the charge is not even caused by a low battery detection, when the contact resistance or the detection cabinet charge current does not result in uneven. In a short time storage (12 hours), the voltage difference is small, but the voltage difference between the long-term storage is large, this low voltage has no quality problem, can be solved by charging. Store over 24 hours after production charge.

The internal block is large. The difference in detecting device causes the detection accuracy insursion or cannot eliminate contact resistance, will cause the display internal blocking to the display, and the communication bridge method should be used to test the internal resistance instrument detection. 2.

The storage time is too long, the lithium-ion battery is stored too long, causing capacity loss, internal passivation, large internal resistance, can be solved by charge and discharging. 3. Abnormal heat generation causes the internal resistance of the electrical cell to processes (spot welding, ultrasonic waves, etc.

) to abnormally heat the battery, so that the diaphragm is thermally closed, and the internal resistance is severe. Lithium ion battery expansion 1. When the lithium ion battery is charged, the lithium-ion battery will naturally expand when charging, but generally no more than 0.

1 mm, but overcharge can cause electrolytic solution, increased internal pressure, lithium ion battery expansion. 2. The expansion during processing is generally processed abnormality (such as short-circuit, overheating, etc.

) caused internal heat-sensitive excessive electrolyte decomposition, lithium ion battery expansion. 3. When the cycle is cycled, the thickness will increase as the number of cycles increases, but it is basically not added after more than 50 weeks, and the normal new increment is 0.

3 ~ 0.6mm, the aluminum shell is relatively serious, this phenomenon It belongs to the normal battery reaction. However, if the new housing thickness or reduction of internal materials can properly reduce the expansion phenomenon.

Dist-weld battery power-down phenomenon aluminum-shell battery is below 3.7V after spot welding, generally because the point soldering current is substantially caused by breakdown of the internal diaphragm in the battery core, resulting in a voltage drop. Generally, the spot welding position is incorrect.

The correct spot welding position should be welded at the bottom or with a marker A or side spot, no marking side and the surface is not welded. In addition, some solderability is too poor solderability, so it is necessary to use a large current spot welding, resulting in the internal temperature resistant tape, resulting in short circuit interior of the battery. Some of the battery power-down after spot welding is due to the large discharge of the battery itself.

Battery explosions generally have the following cases: 1. Over-charge explosion protection line out of control or detection cabinet out of control makes the charging voltage greater than 5V, resulting in an electrolyte decomposition, the internal pressure of the battery, rapid increase in the battery, battery explosion. 2.

Overcurrent explosion protection line out of control or detection cabinet out of control makes the charging current excessively cause lithium ion without being embedded, and a lithium metal is formed on the surface of the pole, penetrate the diaphragm, and the positive and negative electrode short circuit causes an explosion (rarely occurred). 3. When the ultrasonic welding plastic shell is exploded, the ultrasonic welding plastic shell is used.

Since the equipment is transferred to the battery core, the ultrasonic energy is great to melt the internal diaphragm of the battery, and the positive and negative is directly shorted, and the explosion occurs. 4. When the spot welding, the explosion spot welding time is too large to cause an exploded interior, and the positive electrode connecting sheet is directly connected to the negative electrode when spot welding, and the positive negative is directly short-circuited.

5. Over-explosive battery over-discharge or overcurrent discharge (3C) is easy to dissolve the negative electrode copper foil to deposit the positive and negative short circuit (rarely occur). 6.

When the vibration falls, the explosive cell is misplaced in the electrical core of the battery caused by vigorous vibration or falling, and directly sesers and exploded (rarely occur). Battery 3.6V platform low 1.

The detection cabinet sampling or detection cabinet is unstable to cause low test platform. 2. The ambient temperature is low (discharge platform is affected by ambient temperature).

Positive electrode connecting tablets with force to move the positive electrode contact, so that the battery is blocked. 2. The spot welding piece has no welding, contacting the resistance, so that the battery is blocked by the internal tear-cut line Anbo test (stock code: 837435) As a private third party inspection, identification, testing and certification service agency, a new three board Listed companies, there are currently 6 experimental testing bases, in terms of safety test, electromagnetic compatibility, wireless radio frequency, energy stars, food contact materials, physicochemical test laboratories, new energy batteries, environmental monitoring, automotive materials testing and certification Rich related experience and advanced equipment and technology, we have a first-class service team, the latest all kinds of authorization qualifications are approved by the CNAS national laboratory, CMA, CMAF measurement, and obtain CCC certification of my country's National Certification Supervision and Administration Commission Specify laboratory qualification and CQC signature laboratory qualification, US NVALP approved, and obtained US Consumer Goods Safety Commission CPSC, FCC, UL, Germany TUV-SüD, Korea KTC authorized third-party comprehensive testing mechanism.