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A structure design method of a metal heat dissipation power battery pack and the battery pack

A power battery pack and structural design technology, applied to batteries, structural parts, secondary batteries, etc., can solve problems such as thermal runaway, battery cells without load-bearing structures, and battery leakage

Active Publication Date: 2019-08-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strong impact force of the electric vehicle causes the structure of the battery pack to undergo a large deformation, and the internal battery will rapidly leak, short circuit, thermal runaway, etc., and a large amount of heat will be generated rapidly, which will eventually cause the car to catch fire and explode
The main reason is that there are defects in the design of the battery pack structure. There is no load-bearing structure between the battery cells or the load-bearing structure is weak, which fails to meet the safety requirements of the battery pack.

Method used

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  • A structure design method of a metal heat dissipation power battery pack and the battery pack
  • A structure design method of a metal heat dissipation power battery pack and the battery pack
  • A structure design method of a metal heat dissipation power battery pack and the battery pack

Examples

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Embodiment

[0209] Take the design of a structure containing 25 18650 lithium-ion power battery packs as an example:

[0210] Power battery structure such as Figure 8 As shown, the overall size of the structure is 18cm×18cm×6.5cm, and 25 power batteries are evenly distributed in the cylinder; the power battery pack structure is made of aluminum alloy, and the heat-conducting silica gel sheet filled between the battery and the structure functions as insulation, heat conduction, and buffer And so on.

[0211] The overall flow of the power battery pack structure design method is as follows: figure 1 As shown, the specific steps are as follows:

[0212] refer to figure 2 , determine the structural design process of the power battery pack, starting from step S200:

[0213] Step S201: the number of discrete units in the x-axis direction and the y-axis direction of the flat plate with a size of 18cm×18cm is 90;

[0214] Step S202: the filtering radius is set to 2.1;

[0215] Step S203: t...

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PUM

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Abstract

A structural design method for metal heat dissipation power battery packs and battery packs, including defining materials, boundaries and loads, defining non-design domains and design domains, discretizing finite elements, solving the overall heat conduction matrix and overall stiffness matrix of the structure, and analyzing the structural thermo-solid coupling field , Structural flexibility and temperature sensitivity analysis, flexibility sensitivity analysis, mesh filtering to eliminate the checkerboard format, introducing volume constraints and temperature constraints, developing temperature-constrained thermal-mechanical coupling topology optimization, optimizing the planar structure of the battery pack, etc., with good and uniform The heat dissipation performance and greater rigidity can further improve the cruising range and driving safety of electric vehicles.

Description

technical field [0001] The invention relates to the technical field of electric vehicle power battery packs, in particular to a temperature-constrained structural optimization design method of a power battery pack with a metal structure for heat dissipation and a battery pack structure. Background technique [0002] The performance of power batteries is sensitive to temperature changes. When an electric vehicle is running under different driving conditions such as high speed, low speed, acceleration, deceleration, etc., the power 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 influence, a large amount of heat will be accumulated. heat. 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 unevenness among the cells in the battery pack, and ag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/613H01M10/617H01M10/625H01M10/653H01M2/10H01M50/20
CPCH01M10/613H01M10/617H01M10/625H01M10/653H01M2220/20H01M50/20Y02E60/10
Inventor 祝雪峰邹亚东
Owner DALIAN UNIV OF TECH
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