Lithium batteries generate a lot of heat, what is a good solution to cool down?

If it is its own heating, it can reduce the internal resistance of the battery by changing the process, which can reduce the temperature of the battery, and if it is an external factor, it can be done by adding auxiliary devices, such as adding a thermal insulation layer.

Generally, an air-cooled or water-cooled device is added to cool down;

If the heat is serious during normal use, it means that the load of the lithium battery is too large, or the lithium battery itself does not have a cooling system, which needs to be paid attention to.

There are 2 types of cooling of this type of battery

Does this battery heat up at the beginning of the new use? Or did it take a while to get hot? If the new one is heated, the battery is considered to be continuously discharged and cannot meet the needs of the equipment.

If it heats up after using it for a while, it means that the battery is damaged, and the internal resistance increases and causes the battery to heat up! There is also a possible external factor, the equipment transformation has increased the additional load or the load failure leads to the increase of the battery discharge current, resulting in the battery not meeting the discharge requirements and will also heat up. Hope it helps!

The cooling scheme depends on the environment in which the lithium battery is used, the cooling effect that needs to be achieved, and the design of the lithium battery pack.

Simple and common such as:

1. Direct thermal conductivity of high thermal conductivity silica gel sheet.

2. Thermally conductive silica gel sheet + graphene thermally conductive sheet.

It is suitable for simple and simple battery heat dissipation schemes, such as the battery pack cooling and heat dissipation scheme of ordinary lithium bicycles.

Intermediate and advanced common such as:

1. Thermally conductive potting compound.

2. Thermally conductive potting compound + thermally conductive oil.

It is suitable for high performance requirements, high temperature control, the battery pack should be completely sealed, puncture-proof and waterproof, etc., to meet most of the heat dissipation and cooling requirements, such as early low-speed electric vehicles, new energy vehicle battery pack cooling and heat dissipation scheme.

New medium and high-grade lithium battery cooling schemes such as:

1. Solid-liquid phase change materials.

2. Shaped solid-liquid phase change materials.

The cooling scheme of the new material is commonly used in the heat dissipation and cooling scheme of the battery of new energy vehicles, and the thermal management system prevents the thermal runaway of the lithium battery.

Pure solid-liquid phase change materials need to be sealed, puncture-proof and waterproof, similar to the way of using thermally conductive potting compound to encapsulate battery packs, but the effect will be much better.

The shaped solid-liquid phase change material was first developed by Liwang New Materials, and is currently used in the battery thermal management scheme of some new energy vehicles, and the effect of heat absorption and cooling and temperature control is very obvious.

The cooling scheme of lithium battery actually depends on the application environment, and important projects are recommended to be solved by companies with professional thermal management solutions, such as Liwang new materials. For conventional cooling solutions, it is necessary to choose the corresponding thermal management materials.

Lithium batteries generally have good low temperature resistance, but in the case of -20 degrees, it will also cause a decrease in capacity.

Theoretically, lithium-ion batteries cannot be charged at temperatures below 0. Although there is no effect in the short term, lithium batteries will still have lithium metal precipitation on the anode surface. And the process is irreversible.

Therefore, if it is repeatedly charged at low temperature, it will cause damage to the battery and reduce the safety of the battery, especially when it is squeezed and impacted by the outside world.

Effect of cooling on lithium batteries:

Low temperature has an impact on the positive and negative electrodes, balance shed delyses and adhesives of lithium-ion iron phosphate batteries. For example, the lithium iron phosphate cathode itself has poor electronic conductivity, and it is easy to polarize in low temperature environments, thereby reducing the battery capacity.

Affected by low temperature, the speed of graphite lithium intercalation decreases, and it is easy to precipitate lithium metal on the surface of the negative electrode, if it is put into use for insufficient shelving time after charging, the lithium metal can not be fully embedded in the graphite again, and some lithium metal continues to exist on the surface of the negative electrode, which is very likely to form lithium dendrites, which affects the safety of the battery.

The low temperature environment will affect the capacity of the power bank but will not cause permanent damage, this is for the situation that it is not used in a low temperature environment for a long time, or the temperature is not low enough. When used in a cryogenic environment for a long time, or in an ultra-low temperature environment of -40, the power bank will be "frozen bad" and cause permanent damage.

After the lithium battery cell is overcharged to a voltage higher than , it will begin to produce ***. The higher the overcharge voltage, the higher the danger. When the voltage of the lithium cell is higher than , the number of lithium atoms left in the cathode material is less than half, and the storage compartment often collapses, causing a permanent decrease in the battery capacity.

If the charge continues, the storage compartment of the negative electrode is already filled with lithium atoms, and the subsequent lithium metal will accumulate on the surface of the negative electrode material.

If the mobile phone signal is not good, it will heat up, because the mobile phone is constantly in contact with the base station, the worse the signal, the greater the power used, the greater the radiation to the human body, the greater the battery consumption, and the fever is serious, it is recommended to turn off the phone as much as possible when the signal is not good. FYI.