Thermal management system for automotive batteries

Abstract

The invention discloses a thermal management system for automotive batteries, which relates to a thermal management system, and is designed through combining the intelligent control and natural-convection recirculation technology of controlled element computers and a heat transfer mode principle. The system disclosed by the invention is low in power consumption and small in volume, and does not produce mechanical noises; and by using the system, a battery system is always in a good working environment, thereby prolonging the service life of the battery system, ensuring the safety of the battery system, and reducing the application cost of the battery system.

Description

technical field [0001] The invention relates to a thermal management system, in particular to a thermal management system for a vehicle battery. Background technique [0002] Since my country's reform and opening up, the national economy has grown rapidly, and "scientific and technological innovation, independent innovation" has become the mainstream of my country's current industrial development. With the global energy shortage, traditional cars need to use a lot of fuel, making the energy crisis worse. At the same time, the tail gas emitted by traditional vehicles has also brought harm to people's health, and also caused pollution to the atmospheric environment. In order to ensure the sustainable development of society, hybrid electric vehicles and electric vehicles are currently important industrial directions for the development of our country. They can greatly reduce or eliminate exhaust emissions and reduce energy consumption, which has attracted great attention from ...

AI Technical Summary

Problems solved by technology

However, the life of the battery will be significantly shortened if the battery works for a long time in a high temperature environment, this situation should be avoided

When the battery is at low temperature, the activity is significantly reduced, the ohmic internal resistance and polarization internal resistance of the battery increase, the discharge capacity decreases, the discharge platform becomes lower, and the battery is easier to reach the discharge cut-off voltage, which reduces the actual available capacity of the battery and improves the general energy efficiency. decline

In particular, when charging at low temperature, due to the poor activity of the battery, especially the decline in the intercalation ability of the graphite at the negative electrode of the battery, the lithium ions released from the positive electrode reaction may be deposited on the negative electrode, forming the formation of lithium crystals, making the available lithium The reduction of ions will cause a short circuit inside the battery in severe cases

The power battery is composed of multiple battery cells connected in series and parallel. The power battery cells cannot work normally under extreme low temperature (less than -30°C) and extreme high temperature (greater than 55°C) environments

In addition, the power battery is composed of dozens or hundreds of battery cells connected in series and parallel. If one of the batteries deteriorates due to aging or other reasons, the performance of the entire power battery will drop significantly; if a battery If a single cell fails, it may cause the failure of the entire battery cell

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