With the rapid development of science and technology level, the scope of use of lithium battery and action already is self-evident, but in our daily life lithium batteryaccidents always emerge in an endless stream, always haunt us, in view of this, small make up special finishing the common problems and solutions of lithium ion analysis,hope to provide convenience to everyone.

One, voltage is not uniform, the individual is low

1 self discharging caused by low voltage

The electric core self discharging, the voltage lower than other fast, low voltage can be eliminated by detecting voltage after storage.

The 2 charge caused by uneven voltage low

Battery detection in charge, because the contact resistance or detecting cabinetcharge current caused by inconsistency of electric charge are the core. Stored in a short period of time (12 hours) of measuring the voltage difference is very small, but long-term storage voltage difference, the quality problem of the low voltage does notsolve, can charge. Store over 24 hours in the production of charged after measuring voltage.

Two, the internal resistance is too large

1 detection equipment differences

If the detection precision is not enough or can't eliminate the contact electrical group,will cause the display resistance slants big, should be detected by alternating current bridge method principle of resistance test instrument.

2 long time storage

Lithium battery storage for too long, resulting in loss of capacity is too large, the internal passivation, larger resistance, can charge and discharge activation to solve.

3 abnormal heating caused by the large internal resistance

The electric core in processing (spot welding, ultrasonic etc.) make the batteryabnormally heated, makes the diaphragm to generate heat closing phenomenon,internal resistance increase seriously.

Three, the expansion of lithium battery

Expansion of 1 lithium battery charging

Lithium battery when charging, lithium-ion batteries can naturally produce expansion,but generally not more than 0.1mm, but the over charge will cause the electrolyte decomposition, increasing the pressure in the expansion, lithium battery.

When processing the expansion 2

The general is the emergence of machining abnormal (such as short circuit, such as overheating caused by excessive internal heat) electrolyte decomposition, lithiumbattery expansion.

3 cycles of expansion

The battery in the circulation when the thickness increases with the increase in the number of cycles, but more than 50 weeks after the basic not increasing, increasing the amount of 0.3~0.6 in the normal mm, the aluminum shell is more serious, the phenomenon is normal cell reaction caused by. But if the increase in the thickness of the shell or reduce internal material can be appropriate to reduce the swelling phenomenon.

Four, after spot welding power down phenomenon

Aluminum shell battery in the spot after the voltage is lower than 3.7V, it is generally because welding current through the electric core inner diaphragm breakdown andshort-circuit, resulting in a voltage drop too fast.

Is generally caused by spot welding position is not correct, the correct spot locationshould be on the bottom or marked "A" or "-" side spot welding, no logo side and largesurface is not the spot welding. In addition, some nickel belt weldability is too bad, so you must use a large current spot, causing the internal high temperature tape can notplay a role, resulting in electric core internal short circuit.

Spot weld the rear battery power down partly because the battery itself caused by self discharge is large.

Five, the battery explosion

Have battery explosion generally have the following situation:

1 over charge explosion

The protection circuit is out of control or detection cabinet control to the charging voltage is greater than 5V, resulting in the electrolyte decomposition, the internal battery reacts violently, the internal pressure of the battery is increased rapidly, the battery explosion.

2 overcurrent explosion

The protection circuit is out of control or detection cabinet control to the charge current caused by excessive lithium ion not embedding, and the pole piece is formed on the surface of the lithium metal, penetrating diaphragm, positive and negativedirect short circuit caused by explosion (rarely).

The explosion of 3 ultrasonic welding plastic shell

Ultrasonic welding of plastics shell, the reason of equipment to make the transfer ofultrasonic energy to the battery core, ultrasonic energy is Ambassador inside the battery diaphragm melting, positive and negative direct short circuit, causing explosion.

4 when the explosion welding

The current is too large to cause serious internal short circuit explosion, the spot welding in addition, when spot welding connection piece is connected directly with thepositive negative, so that positive and negative pole directly short-circuit after the explosion.

5 put the explosion

The battery over discharge or discharge (more than 3C) of the cathode copper foileasy dissolved deposition to the diaphragm to make positive and negative pole direct short-circuit explosion (rarely).

The explosion vibration falls 6

The electric core resulting in severe vibration or drop the inside the electricity corepole piece dislocation, direct and serious short-circuit and explosion (rarely).

Six, low battery 3.6V platform

1 detecting cabinet sampling inaccuracies or detecting cabinet instability caused bylow test platform.

2 the temperature of the environment caused by the low platform with low (dischargeplatform affected by the temperature of the environment a lot)

Improper seven, processing

(1) move with force spot positive connection piece to cause electric core anode bad contact, make electric core large internal resistance.

(2) spot welding connection piece without weld, large contact resistance, so that the internal resistance of the battery is big.