Battery thermal management device and power battery system for vehicle

Abstract

The invention provides a battery thermal management device and a power battery system for a vehicle. The battery thermal management device comprises: a conductive unit adapted to be connected to a tab of a battery or to an electrical element of a battery system; the insulation heat conduction unit is in contact with the electric conduction unit; the heat exchange unit is in contact with the insulation heat conduction unit; wherein the electric conduction unit, the insulating heat conduction unit and the heat exchange unit are mutually stacked and connected into a whole. According to the battery heat management device disclosed by the invention, by providing an optimized heat transfer path, the heat conduction efficiency of the battery or the battery system is greatly improved; the modular integrated design reduces device costs, and is easily compatible to various battery or battery system applications, while functioning as conducting as well as cooling and / or heating.

Description

technical field [0001] The present invention generally relates to the field of vehicles, especially to the field of power battery systems for new energy vehicles (electric vehicles, hybrid vehicles). More specifically, it relates to a battery thermal management device and a power battery system using the battery thermal management device. Background technique [0002] Hybrid and pure electric vehicles usually require high-efficiency power battery systems to provide energy. When running at high power, the charging and discharging process of the battery generates a lot of heat, which makes the internal heat of the battery build up and causes the battery to degrade. Since the power battery is sensitive to temperature, more and more battery systems are equipped with a cooling system such as air cooling or liquid cooling in order to make the power battery work at an optimal temperature. [0003] In addition, the working principle of lithium-ion batteries is essentially a redox ...

AI Technical Summary

Problems solved by technology

Usually, the heat dissipation component 21 can be a heat dissipation pad or thermal paste (or non-solid heat conduction material), etc., and the thermal conductivity of this type of heat conduction material is low, usually 2W / m·k, so the cooling efficiency is too low

For heating, it is also inefficient for the same reason

Moreover, when charging or discharging, the heat cannot be transferred to the surface of the battery quickly and effectively, and the internal temperature difference of the battery is large, which seriously reduces the cycle life of the battery.

On the other hand, a battery module usually contains dozens to hundreds of batteries. Due to the different positions of the battery module in the battery system casing, the temperature difference between the batteries is also large, which also affects the cycle life of the system.

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