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Power battery thermal management method and system based on phase change material

A technology for power batteries and phase change materials, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of complex pipeline layout, difficult system maintenance, liquid leakage, etc., to achieve simple system structure, avoid local high temperature, meet the The effect of using conditions

Inactive Publication Date: 2020-02-18
HOZON NEW ENERGY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid cooling technology has a better heat dissipation effect, but it is easy to cause liquid leakage, the layout of the pipeline is more complicated, the cost is higher, and the maintenance of the system is more difficult

Method used

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  • Power battery thermal management method and system based on phase change material
  • Power battery thermal management method and system based on phase change material
  • Power battery thermal management method and system based on phase change material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] figure 1 It is a schematic diagram of battery temperature change with or without phase change material. With phase change material, the battery can maintain a constant temperature for a period of time, so that the temperature of the battery is in a linear and steady rise process, and the service life of the battery 4 is extended.

[0027] Such as figure 2 As shown, a power battery thermal management system based on phase change materials includes a heat-conducting fixing bracket 2, a PCM heat sink 3, and a PTC heating plate 1. The heat-conducting fixing bracket 2 is arranged outside the battery core 4, and the PCM heat sink 3 is surrounded by the battery core 4 and embedded inside the heat-conducting fixing bracket 2, and the PTC heating plate 1 is arranged outside the heat-conducting fixing bracket 2.

[0028] The PCM heat sink 3 is a graphite / paraffin composite PCM heat sink. The thermally conductive fixing bracket 2 is an aluminum bracket.

[0029] The entire power batter...

Embodiment 2

[0032] The system of the foregoing embodiment 1 can implement a phase change material-based power battery thermal management method, which is specifically as follows:

[0033] The cell 4 of the power battery is surrounded by the PCM heat sink 3. The thermal management method includes a heat dissipation phase and a heating phase. In the heat dissipation phase, when the temperature of the cell 4 reaches 35°C, the PCM heat sink 3 absorbs the heat generated when the cell 4 is discharged And change the form to reduce the temperature of the power battery;

[0034] During the heating phase, when the temperature of the cell 4 is lower than 35°C, the PCM heat sink 3 conducts the stored heat to the cell 4 to maintain the constant temperature state of the cell 4. The heating phase is as follows: Figure 4 Shown.

[0035] That is, when the temperature of the cell 4 is higher than 35°C, the phase change material absorbs the heat of the cell 4 for storage, and reduces the temperature of the cell ...

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Abstract

The invention discloses a power battery thermal management method based on a phase change material. The battery cell of the power battery is surrounded by a PCM heat dissipation board. The thermal management method comprises a heat dissipation stage and a heating stage. In the heat dissipation stage, when the temperature of the battery cell reaches 35 DEG C, the PCM heat dissipation board absorbsthe heat generated during discharging of the battery cell and changes the form to reduce the temperature of the power battery. In the heating stage, when the temperature of the battery cell is lower than 35 DEG C, the PCM heat dissipation board conducts the stored heat to the battery cell to maintain the constant temperature state of the battery cell. The method has the characteristics of good heat dissipation and temperature equalization performance effects and simple system structure and is feasible for temperature management. Meanwhile, the method plays a very important role in the lightweight of battery PACK and the improvement of energy density. Besides, the utilization of phase change material effectively solves the disadvantages in air cooling and liquid cooling thermal management and greatly reduces the production cost and the use cost.

Description

Technical field [0001] The invention relates to the field of lithium batteries for new energy vehicles, in particular to a thermal management method for power batteries based on phase change materials. Background technique [0002] As the main core power component of new energy electric vehicles, power battery packs directly affect the performance of electric vehicles. When an electric vehicle is climbing, starting, or suddenly accelerating and fast charging, it generates a lot of heat instantly. Because the power battery itself generates a certain amount of heat during the charging and discharging process, the temperature rises, and the temperature rise will affect many characteristics of the power battery Parameters such as internal resistance, voltage, SOC, available capacity, charge and discharge efficiency and battery life. The thermal effect of the battery will also affect the performance and cycle life of the vehicle. Therefore, the power battery thermal management syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/613H01M10/615H01M10/625H01M10/653H01M10/6554H01M10/657
CPCH01M10/613H01M10/615H01M10/625H01M10/653H01M10/6554H01M10/657Y02E60/10
Inventor 崔剑李璞肖岩
Owner HOZON NEW ENERGY AUTOMOBILE CO LTD
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