New-energy automobile power battery thermal management device and method

Abstract

The invention relates to a new-energy automobile power battery thermal management device and method, and belongs to the technical field of new-energy automobile battery management. The method comprises the following steps that a first temperature sensor detects the real-time temperature T of a power battery pack and presets four temperature grades for the real-time temperature T, a second temperature sensor detects the temperature difference -T between the high and low temperature ends of a thermobattery module, and a voltage sensor detects the temperature difference voltage U of the thermobattery module; a controller presets the critical temperature of the thermobattery module as Th, the critical voltage is Uh, the low temperature end temperature is T1, the high temperature end temperature T2, and if it is determined that -T is larger than Th and U is larger than Uh, a temperature relay module is controlled to drive the thermobattery module to act; the controller judges the real-timetemperature T of the power battery pack on the basis of the preset temperature grades. The device has the advantages that air cooling and water cooling are organically combined through an optimal control strategy, efficient thermal management of power batteries is achieved, the battery life can be prolonged, and the using efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicle battery management, and in particular relates to a new energy vehicle power battery heat management device and a management method thereof. Background technique [0002] As a new energy vehicle, electric vehicles require large motor power, strong power, fast speed, and long running time. Therefore, several or even dozens of battery packs are required to be arranged in series and parallel to increase the energy and storage capacity of the battery. Lithium batteries have been widely used in the field of electric vehicles due to their advantages of high energy density, high number of repeated cycles, light weight and environmental protection. The operating temperature of lithium batteries is one of the key factors restricting the current mileage, safety and reliability of new energy vehicles. If the temperature is too high or too low, the battery capacity, mileage and reliability will decr...

AI Technical Summary

Problems solved by technology

The operating temperature of lithium batteries is one of the key factors restricting the current mileage, safety and reliability of new energy vehicles. If the temperature is too high or too low, the battery capacity, mileage and reliability will decrease. Therefore, special battery thermal management is required. System to solve the problem of short mileage of new energy vehicles under different working conditions

Commonly used new energy vehicle battery thermal management systems generally adopt a single air-cooled or water-cooled working mode. However, this thermal management method cannot meet the requirements of efficient and balanced heating and heat dissipation. The specific performance has the following defects: First, the extremely harsh environment The lower thermal management efficiency is low, and the thermal management effect is not obvious; second, the battery pack has a large number of single cells, and the thermal management is unbalanced; the thermal management system consumes a lot of energy, mainly relying on the power battery for power supply; poor temperature regulation

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