16340 battery

Research on heat dissipation of 16340 battery, heat dissipation methods of 16340 battery

Research on heat dissipation of polymer lithium-ion batteries, heat dissipation methods of polymer lithium-ion batteries. Lithium-ion batteries are widely used in electric vehicles to replace traditional energy sources. The performance of lithium-ion batteries is directly related to the performance of the entire vehicle, and temperature is an important factor affecting the performance of lithium-ion batteries. If lithium-ion batteries work at high temperatures for a long time, the battery performance will decay rapidly and even cause thermal runaway. Therefore, it is particularly important to study the heat dissipation method of lithium-ion batteries.

Research on heat dissipation of polymer lithium-ion batteries

At present, most lithium-ion batteries are composed of flammable and volatile non-aqueous solutions. This composition system has higher specific energy and voltage output than batteries composed of aqueous electrolytes. Because non-aqueous electrolytes are flammable and volatile, they are infiltrated into polymer lithium-ion batteries and form the source of battery combustion.

Therefore, the operating temperature of the above two battery materials must not be higher than 60℃, but now the outdoor temperature is close to 40℃. At the same time, the battery itself generates a lot of heat, which will cause the working environment temperature of the battery to rise. If thermal runaway occurs, the situation will be very dangerous. In order to prevent it from becoming a "barbecue", it is particularly important to dissipate heat for the battery.

Since the heat generated by the internal power consumption in the battery stack cannot be effectively dissipated from all sides, the temperature inside the battery will rise to varying degrees. In particular, the two main surfaces of the battery, when used as the combination surface of the battery pair, can form an adiabatic working condition, resulting in a large temperature rise. Therefore, it is very necessary to arrange an effective heat dissipation surface to dissipate the heat outward, which is very necessary for controlling the temperature rise of the battery.

The maximum temperature rise and minimum temperature rise models are established for the temperature rise characteristics caused by the internal resistance power consumption of the polymer lithium-ion battery pack during high-power output, and a mathematical model is established for the stacked heat dissipation and numerical calculations are performed. Through analysis and research, it is known that the temperature rise effect of the battery pack is obvious, and the temperature rise effect inside the battery can be effectively suppressed when an appropriate heat dissipation arrangement is adopted.

Polymer lithium-ion battery heat dissipation method

There are two types of heat dissipation methods for polymer lithium-ion batteries: active and passive, and there is a big difference in efficiency between the two. The passive system requires a relatively low cost and simpler measures; the active system structure is relatively complex and requires greater additional power, but its thermal management is more effective.

In actual electric bus applications, air cooling is often used because the battery pack has a large capacity and volume, and the power density is relatively low. The power density of the battery pack for ordinary passenger cars is much higher. Correspondingly, it has higher requirements for heat dissipation, so water cooling is more common.

Different battery structure sensors will be determined according to the temperature measurement points and needs. The temperature sensor will be placed in the most representative position with the largest temperature change, especially the highest and lowest temperatures and the area with strong heat accumulation in the center of the battery pack. This helps to control the temperature of the battery in a relatively safe environment to prevent overheating and overcooling from causing danger to the battery.

The electrolyte is to isolate the source of combustion, the diaphragm is to increase the heat resistance temperature, and sufficient heat dissipation is to reduce the battery temperature and prevent excessive heat accumulation from causing thermal runaway of the battery. If the battery temperature rises sharply to 300℃, even if the diaphragm does not melt and shrink, the electrolyte itself, the electrolyte and the positive and negative electrodes will undergo a strong chemical reaction, release gas, form internal high pressure and explode, so it is crucial to adopt a suitable heat dissipation method.

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