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Temperature range and heat dissipation method for ternary lithium battery packs. The ternary lithium battery pack is not sensitive to the temperature range of 0-40 ℃, but once the temperature exceeds this range, its lifespan and capacity will be compromised. The low-temperature performance of lithium batteries made of different materials also varies.

Temperature range for the use of ternary lithium battery packs

The conventional working temperature for ternary lithium battery packs is -20 ℃~60 ℃. However, generally, when the temperature drops below 0 ℃, the performance of lithium batteries will decrease, and the discharge capacity will correspondingly decrease. Therefore, the working temperature for lithium batteries with complete performance is usually 0~40 ℃. Some special environments require different temperatures for lithium batteries, and some can even operate normally in environments of hundreds of degrees Celsius.

The working temperature of ternary lithium batteries is generally between 0-40 degrees. For lithium battery packs, there is currently no clear theoretical support in the industry for their internal resistance, discharge platform, lifespan, capacity, and other necessary connections at various temperature performance levels. Relevant calculation formulas and mathematical models are still in the exploratory stage. Generally speaking, lithium batteries are not sensitive to temperatures in the range of 0-40 ℃, but once the temperature exceeds this range, their lifespan and capacity will be compromised.

There is currently no way to quantify the specific requirements, as the high activity and consistency of lithium battery packs are the biggest issues. Even products from the same batch, material, and process can have significant differences in performance. So, the usage time of ternary lithium batteries in winter is inevitably shorter than in summer.

As a rechargeable lithium battery, ternary lithium battery packs have stable output voltage, high output voltage, stable performance, large capacity, long service life, wide operating temperature range, good safety, and environmental friendliness. Therefore, they have great room for improvement in the future development of lithium batteries.

Heat dissipation methods for ternary lithium battery pack systems

There are two types of heat dissipation for ternary lithium battery packs: active and passive, and there is a significant difference in efficiency between the two. The cost required for passive systems is relatively low, and the measures taken are also relatively simple. The active system structure is relatively complex and requires greater additional power, but its thermal management is more effective.

◆ Air cooling structure heat dissipation method for power ternary lithium battery pack

1. Install a cooling fan at one end of the ternary lithium battery pack and leave a ventilation hole at the other end to accelerate the flow of air between the gaps of the battery cells, taking away the high heat generated during the operation of the battery cells;

2. Add thermal conductive silicone gaskets at the top and bottom of the electrode ends, allowing the heat that is not easily dissipated at the top and bottom to be transmitted to the metal shell for heat dissipation through TIF thermal conductive silicone film. At the same time, the high electrical insulation and puncture resistance of the silicone film provide good protection for the battery pack.

◆ Liquid cooling structure heat dissipation method for power lithium battery pack

1. The heat of the battery cell is transferred to the liquid cooling tube through thermal conductive silicon film, and the heat is carried away by the free circulation of thermal expansion and contraction of the coolant, which unifies the temperature of the entire battery pack. The strong specific heat capacity of the coolant absorbs the heat generated during the operation of the battery cell, allowing the entire battery pack to operate at a safe temperature.

2. The thermal conductive silicone sheet has good insulation performance and high resilience, which can effectively avoid vibration, friction, and damage between battery cells, as well as the risk of short circuits between battery cells. It is the best auxiliary material for water cooling schemes.

◆ Natural convection heat dissipation method for power battery pack

1. This type of ternary lithium battery pack has a large space and good contact with air. The exposed part can naturally exchange heat through the air, while the bottom part that cannot naturally exchange heat is dissipated through a heat sink. Thermal conductive silicon film fills the gap between the heat sink and the battery pack, providing thermal conductivity, shock absorption, and insulation.

2. The heating element scheme is often applied in the new energy vehicle market. The heat of the battery preheating heating element before startup is transferred to the lithium battery pack through the thermal conductive silicone film. The preheating battery and thermal conductive silicone film have good thermal conductivity, insulation performance, and wear resistance, which can effectively heat transfer and prevent wear and short circuits caused by friction between the ternary lithium battery pack and the heating element.

A major drawback of ternary lithium batteries is that they have a lower ignition point when subjected to impact and high temperatures. So the protection requirements for ternary lithium batteries are very high to prevent accidents. Lithium ion batteries, as the energy source of electric vehicles, are the most critical component and directly affect the performance of electric vehicles. And temperature is one of the important factors affecting the performance of battery packs. During operation, a large amount of heat generated by batteries accumulates due to the influence of space, causing uneven temperature distribution throughout the battery pack, thereby affecting the consistency of individual battery packs.

Therefore, in order to put the ternary battery pack in the most suitable working state, and to maximize the performance and lifespan of the lithium battery pack, it is particularly important to provide heat dissipation for the battery.

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