Water-cooled heat management system of electric automobile battery pack

Abstract

The invention discloses a water-cooled heat management system of an electric automobile battery pack. A power battery is fixed between an upper fixing baffle and a lower fixing baffle; a cooling separator is arranged tightly against the power battery; a cooling channel is disposed in the cooling separator, two ends of the cooling channel are communicated with a liquid inlet pipe and a liquid outlet pipe; the liquid inlet pipe is connected with a water pump through a liquid inlet connector; the liquid outlet pipe conveys heat transfer working media cooled by the cooling channel to a heat exchanger and a heating insulation water tank through a liquid outlet connector; the cooling separator is provided with a temperature sensor; and a BMS reads temperature data of the temperature sensor and controls the heat transfer working media conveyed to the inner portion of the cooling separator. The water-cooled heat management system solves the control of temperature of the battery pack when the battery is charged or discharged. The water-cooled system which is safe and reliable, has good operational performance, is convenient for maintenance and replacement and is capable of effectively regulating and controlling the working temperature of the battery is provided.

Description

technical field [0001] The invention belongs to the field of thermal management of electric vehicle batteries, and more specifically relates to a water-cooled thermal management system for electric vehicle battery packs, which is suitable for thermal management of power batteries during charging and discharging. Background technique [0002] As the main energy storage element of electric vehicles, lithium-ion power battery packs are the key components of electric vehicles and directly affect the performance of electric vehicles. Lithium-ion power batteries are currently widely used in electric vehicles due to their excellent power output characteristics and long life. However, the performance of lithium-ion power batteries is sensitive to temperature changes, especially for large-capacity, high-power lithium-ion batteries used in vehicles. The loading space on vehicles is limited, and the number of batteries required by vehicles is relatively large, and the batteries are ...

AI Technical Summary

Problems solved by technology

When the vehicle is running under different driving conditions such as high speed, low speed, acceleration, deceleration, etc., the battery will be discharged at different rates, and a large amount of heat will be generated at different heat generation rates. In addition to time accumulation and space effects, uneven heat accumulation will occur , resulting in complex and changeable operating environment temperature of the battery pack

Due to the dense placement of the heating battery body, the central area inevitably accumulates more heat, and the edge area is less, which increases the temperature imbalance between the cells in the battery pack, and aggravates the inconsistency of the internal resistance and capacity of each battery module.

If it accumulates for a long time, it will cause some batteries to be overcharged and overdischarged, which will affect the life and performance of the battery and cause safety hazards

If the electric vehicle battery pack cannot be ventilated and dissipated in time at high temperature, it will lead to excessive temperature or uneven temperature distribution of the battery pack system, which will eventually reduce the battery charge and discharge cycle efficiency, affect the power and energy performance of the battery, and in severe cases It will lead to thermal runaway and affect the safety and reliability of the battery; moreover, at low temperature, the electrochemical reaction inside the battery cannot operate normally due to the influence of temperature, and the battery pack needs to be heated

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