The Cooling Capacity Of Lithium Battery Electric Vehicles

in Technology

The lithium battery is relatively light, easy to carry, and relatively long life. In the case of high temperature, if there is no suitable cooling scheme for the lithium battery of an electric vehicle, the temperature in the battery pack will vary greatly, which will affect the consistency of the single battery and cause a series of subsequent problems.

Advantages of lithium batteries for electric vehicles

  • Strong power
The electric car lithium battery climbs the hill, the load speed is stronger than the lead-acid battery
  • Low volume small
Lithium batteries have a high energy storage density, which is 5-7 times higher than lead-acid batteries, making them easy to install and carry
  • Low lightweight
Lithium batteries weigh about a third as much as lead-acid batteries of the same capacity and can be separated from the car for use at any time
  • Mileage
20 to 30% more than lead-acid batteries
  • Green environmental protection
The lithium battery is environmentally friendly, lithium battery does not contain lead, mercury, cadmium toxic substances
  • Long life
The ultra-long life of lithium batteries for electric vehicles can usually last 5-8 years, which is not matched by lead-acid batteries. Through the advantages of performance, lithium batteries gradually expand the market scale, and the increase in demand directly leads to the expansion of production capacity and the reduction of manufacturing costs, which in turn stimulates the further growth of the market. Lithium battery products thus embarked on a virtuous cycle of development.
  • Wide operating temperature range

The lithium-ion battery of electric bicycles can operate in the range of -25 to 55 degrees, and its capacity can reach 70% of its capacity, while the lead-acid battery can only operate in the range of 10 to 40 degrees, and cannot operate normally at -25 degrees.

The cooling capacity of lithium battery electric vehicles

Lithium-ion batteries in charging and discharging process will produce a certain quantity of heat, particularly in the large current charge and discharge process can produce a lot of heat inside the lithium-ion battery, but due to the lithium-ion battery structure thermal conductivity in different directions exist significant differences, in parallel to the direction of the pole piece is a significantly higher thermal conductivity perpendicular to the direction of the pole piece of the thermal conductivity, so different ways of heat dissipation is not only significant difference inefficiency.

The heat dissipation of lithium battery electric vehicles has always been one of the key technologies in the industry. Compared with traditional lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride batteries, lithium-ion batteries have higher energy density and higher charge and discharge rates. Specially applied in the field of power battery, the road condition is complex and the environment is harsh (especially in the summer with high temperature), the battery heat generation is more intense, which has a more significant impact on the capacity, life span, and especially the safety performance of lithium battery.

To some extent, the safety of the lithium-ion battery problem is, in fact, its thermal dissipation, lithium battery heat production rate is greater than the cooling rate, the battery pack will heat up, once more than the temperature of the battery pack can withstand a tipping point, electrical equipment will be serious safety accidents, so it is very important to li-ion power battery pack heat dissipation problem.

Impress battery has designed the thermal management of lithium battery. The heating and heat dissipation of the battery is very important. The former involves mainly cold start, range, and power, while the latter involves battery system warranty life and vehicle safety.


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