Home News

Analysis of the cause of ignition of lithium ion battery

Certification
China HONG KONG TAC INDUSTRIAL CO., LTD. certification
China HONG KONG TAC INDUSTRIAL CO., LTD. certification
Customer Reviews
Dear Davide, I leave you in Vivian's hands, I'm sure you will come to an agreement., Vivian is professional in our product.

—— Davide Bet

Here is the signed PI. Thank you , We hope

—— Mr Ander

12V 110Ah battery pack for solar product I like your solar battery pack. Good quality and delivery fast.

—— Eyal Dolev

The battery pack is more atractive for us . May I receive drawing of other pack 12V 20AH with dimentional info ? I need 50pcs to test .

—— Nizamettin

We have received the battery packs and performing tests have passed . We are impressed by the assembly. it is almost the best one . thank you

—— Alexander Kozhushko

Pictures show a nice battery pack, performance is ok , We need serial connected 4cells (4S1P) configuration with protection circuitry

—— George Komisar

big thanks for your work, we got the cargos last week, it seems nice.

—— Johnny Black

I think it is a good idea to solve the problem, I am really appreciate you would like to help us.

—— Simone Kowalk

yes , we received the batteries and chargers last Friday, Everything looks great,well packed, no damage and dlivered in the time frame as promised.

—— Met vriendelijke groet

Thanks for your input, we have checked each and every think and on our side every thing is great. Just proceed to submit the company documents to get approval.

—— Joey Schumer

I'm Online Chat Now
Company News
Analysis of the cause of ignition of lithium ion battery

Analysis of the cause of ignition of lithium ion battery

 

As a source of energy for pure electric vehicles, the main cause of ignition of lithium-ion batteries is the thermal runaway caused by overheating of the battery, which is most likely to occur during battery charging and discharging. Since the lithium-ion battery itself has a certain internal resistance, when the output electric energy is powered by pure electric power, a certain amount of heat is generated, so that its own temperature becomes high, and when the temperature exceeds its normal operating temperature range, the entire battery will be damaged. Life and safety. In a pure electric vehicle, the power battery system is composed of a plurality of power battery cells. During the working process, a large amount of heat is generated in a small battery box. If the heat cannot be quickly dissipated in time, the high temperature will affect the power. The battery life may even be out of control, causing accidents such as fire and explosion. In principle, there are four main reasons for the loss of control:

 

(1) Mechanical abuse

Mainly occurs in the collision of a car, due to the external force, the lithium battery cell and the battery pack are deformed, and the relative displacement of the different parts of the battery occurs, causing the battery separator to be torn and an internal short circuit; the flammable electrolyte leakage eventually causes a fire. In mechanical abuse, puncture damage is the most serious, it may insert a conductor into the battery body, causing a direct short circuit between the positive and negative electrodes. In contrast, collision, extrusion, etc., only probabilistic occurrence of internal short circuit, the generation of heat in the puncture process is more intense, and the probability of causing thermal runaway is higher.

(2) Electrical abuse

Electrical abuse is mainly caused by improper use of the battery, and there are several types of external short circuit, overcharge and over discharge. Among them, the transient discharge causes the least harm, but the growth of copper dendrites due to over-discharge will reduce the safety of the battery and increase the probability of thermal runaway. The external short circuit is the result of the connection of two conductors with differential pressure outside the cell. When the external short circuit occurs, the heat generated by the battery cannot be dissipated well, and the battery temperature will rise accordingly. out of control.

 

Overcharging is one of the most harmful of electrical abuse. Lithium dendrites grow on the surface of the anode due to excessive lithium intercalation. Second, excessive deintercalation of lithium causes the cathode structure to collapse due to heat and oxygen release (oxygen release from the NCA cathode). The release of oxygen accelerates the decomposition of the electrolyte, producing a large amount of gas. As the internal pressure increases, the exhaust valve opens and the battery begins to vent. After the active material in the cell contacts the air, a violent reaction occurs, and a large amount of heat is released, thereby causing combustion of the battery pack.

 

(3) Thermal abuse
Heat abuse mainly refers to local overheating in the battery, rarely existed independently, often developed through mechanical abuse and electrical abuse, and is a situation that ultimately triggers accidents such as thermal runaway. Thermal abuse is generally caused by a short circuit caused by a high external environment or a high battery heat caused by the temperature control system not functioning, thereby causing thermal runaway. For reasons, the cause of heat abuse is the most complicated. The collision and damage of the battery pack, the internal structure of the battery, the performance or the failure of other thermal management systems and air conditioning systems may lead to heat abuse.

 

(4) Internal short circuit

 

The internal short circuit is directly contacted by the positive and negative electrodes of the battery. Of course, the degree of contact is different, and the subsequent reactions caused are also very different. Large-scale internal short circuits usually caused by mechanical and thermal abuse will directly lead to thermal abuse. The cause of the internal short circuit is also complicated. For example, the lithium ion battery is overcharged, and the dendrite accumulates to a certain extent, causing the battery separator to penetrate. Therefore, an internal short circuit or a collision or a puncture injury directly causes the positive and negative electrodes to contact, resulting in thermal runaway. Compared with the internal short circuit generated by external factors, the internal short circuit caused by the spontaneous defects in the battery manufacturing process is relatively mild, and the heat generated by the inherent internal short circuit is small, and the thermal runaway is not immediately triggered. Moreover, this inherent defect will evolve over a period of time to a lesser degree of internal short circuit.

 

From  : Energy storage Website of China

Pub Time : 2018-11-07 10:07:49 >> News list
Contact Details
HONG KONG TAC INDUSTRIAL CO., LTD.

Contact Person: Ms. Alice

Tel: 13928880191

Fax: 852--51230576

Send your inquiry directly to us (0 / 3000)

Contact

Address: UNIT 04 7/F, BRIGHT WAY TOWER, NO.33 MONG KOK ROAD, KOWLOON, HK

Factory Address:No.27 BOWANG Street ,Nan Cun Town, Panyu, Guangzhou, GD,China