Phase change heat storage-based low-temperature auxiliary heating device and method for power battery

Abstract

The invention relates to a phase change heat storage-based low-temperature auxiliary heating device and method for a power battery. A solid-liquid phase change heat exchanger is connected to a batterycooling circuit through two electronic liquid three-way valves in parallel; a PTC heater is connected between an electronic water pump and a second electronic liquid three-way valve in series; othertwo ends of a first electronic liquid three-way valve are connected to a temperature sensor and a radiator on a coolant outlet pipe separately; other two ends of the second electronic liquid three-wayvalve are connected to the PTC heater and the radiator separately; and a central control unit is connected with a battery temperature sensor, the temperature sensor, the electronic water pump, an electronic fan, the PTC heater and the two electronic liquid three-way valves. According to the phase change heat storage-based low-temperature auxiliary heating device and method, one part of waste heatemitted from the power battery can be recovered by using phase change latent heat of a phase change material under a normal working condition of the power battery and stored into the phase change material. When the power battery needs to be preheated under a low temperature condition, the heat stored in the phase change material can be transferred to the power battery through a coolant, so that the power battery reaches normal working temperature.

Description

technical field [0001] The invention relates to a low-temperature auxiliary heating device for a power battery, in particular to a low-temperature auxiliary heating device and method for a power battery using phase change heat storage. Background technique [0002] With the increasing energy problems and environmental pollution problems, new energy vehicles, as a substitute for traditional fuel vehicles, are receiving more and more attention. Among them, electric vehicles powered by lithium-ion batteries have become Research hotspots of manufacturers and scientific research institutions. Similar to traditional engines, lithium-ion power batteries emit heat during operation. If there is no suitable thermal management solution, thermal runaway will easily occur, causing the power battery to catch fire, burn or even explode, which will pose a threat to the personal safety of drivers and passengers. serious threat. In the electric vehicle models currently on sale, the heat dis...

AI Technical Summary

Problems solved by technology

Studies have shown that when a power battery is discharged below 0 degrees Celsius, its internal resistance will increase sharply, thereby affecting battery life

At present, the solution for power battery heating under low temperature conditions mainly relies on arranging electric heating wires and heating films on the surface of the battery, and heating through

Images