How do the battery industry find a reasonable balance between energy density and security?

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

Nowadays, many companies are pursuing higher monomers and system energy densities. In order to protect more energy supply, the electrolytic solution of the positive and negative electrolyte can only be used to remove the thickness of the diaphragm. The thickness of the lithium-ion battery diaphragm in the past is 40 microns, only about 12 μm, once the film is broken, and the consequences are very serious.

2016 Samsung Note7 battery fire is due to the shortage of diaphragm. At present, the limit of energy density of the three-dimensional lithium-ion battery theory is around 350WH / kg-400Wh / kg, there are still many engineering issues to be handled. Therefore, if there is no breakfriend on the new material, the battery can be between 300WH / kg-400Wh / kg.

Only in the premise of achieving engineering technology, it is possible to improve the energy density of the monomer battery to 500WH / kg, and it is possible to increase the energy density of the battery pack to 260Wh / kg. However, the development and application of various materials must be in 1-2 years, even longer. At present, the country has adjusted a system than energy density and the power lithium battery system development cycle is not coordinated.

The result is impossible to verify, resulting in the frequency of fire accidents. The EV Century also interviewed Mr. Wang Shan's view of many car companies adopted NCM811 batteries.

Mr. Wang, said: In the case of insufficient verification of the battery system, and in the absence of the thermal management system technology, these models are the on-time bombs in the walk mentioned before, I hope that the car enterprise can pay attention. Dynamic lithium battery safety problem 1.

During the battery manufacturing process. In the manufacturing process, the safety requirements are very high, and the factory for lithium-ion batteries has not been accident, including LG, Samsung. 2, battery pack integration.

Battery monomers are exposed to the outside, assemble the problem when the battery pack. 3, storage process. Why is the battery process out, not to use the user?.

Because the manufacturing process of lithium-ion batteries is too harsh, the current level, including the international level, these big companies are difficult to control. Only in the process of putting it will make it bad to show it. Good company 10-15 days, during this period, small flaw is a battery's voltage attenuation, and the big thing is fire.

4, during transportation. One accident is a long slope of the ship battery, 10-20 kilometers, the brake system temperature is too high. 5, use process.

This is a straight relationship with charging. All the charger principle on the market is full. This principle is a bit like I sit in the subway this morning.

When the invention is invented in 1970, it is called a rocking chair battery. The ion moves back and forth in the positive electrode and the negative electrode. The current charging process does not have a reduction method, and the traction charging method is used, not the way to charge.

Lithium is very active in the periodic table of element, just like being squeezed the subway, everyone is blocked at the door, the more squeezes, the more, the problem is blocked. Everyone saw a lot of photos on the Internet, they were fired when they were charging.

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