Battery module structure design method based on energy flow analysis

A battery module and structure design technology, applied in the field of battery module structure design based on energy flow analysis, can solve problems such as explosion, car combustion, and high hazards, reduce contact area, increase heat flow path, and reduce possible sexual effect

Active Publication Date: 2021-06-29
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

The energy released by the thermal runaway of a single battery is limited, but if the thermal runaway spreads between the single batteries and causes the thermal runaway of the battery module or even the battery pack, the accumulated energy released by a large number of batteries will be huge. It may cause the car to burn or even explode, which is extremely harmful

Method used

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  • Battery module structure design method based on energy flow analysis
  • Battery module structure design method based on energy flow analysis
  • Battery module structure design method based on energy flow analysis

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Embodiment 1

[0032] At present, the "Safety Requirements for Traction Batteries for Electric Vehicles" stipulates that the battery pack or system should provide a thermal event alarm signal 5 minutes before the thermal spread caused by the thermal runaway of a single battery, which will cause danger to the passenger compartment (serving for the thermal event of the whole vehicle) alarm to remind occupants to evacuate). This requirement is considered to be fulfilled if heat dissipation does not create a situation that would endanger the vehicle occupants. In the prior art, considering cost and volume constraints, battery modules are arranged in series, such as figure 2 As shown, the heat flow path is single. When a single battery thermal runaway occurs, the heat released by the thermally runaway single battery can only spread one-to-one, and flow to the adjacent single battery, resulting in adjacent The single battery absorbs more heat and heats up faster, so the time for its thermal runa...

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Abstract

The invention relates to a battery module structure design method based on energy flow analysis. The method comprises the following steps: obtaining constraint conditions and preset battery module heat spread time T, and constructing a battery module model; carrying out heat spread simulation analysis on the battery module model in simulation software, if the heat spread time t is greater than the preset battery module heat spread time T, obtaining the optimal battery module model, otherwise, carrying out energy flow analysis, increasing the heat flow path of the single battery, reducing the heat transfer between the adjacent single batteries, and obtaining the optimal battery module model. And performing thermal spread simulation analysis again. Compared with the prior art, the method has the advantages that the battery module model which meets the constraint condition and is relatively long in heat spreading time is found by changing the arrangement mode of the single batteries, the volume constraint and heat spreading time requirements of the battery module are considered, and the obtained battery module model can buy enough time for fire-fighting measures; and the possibility of occurrence of disasters and accidents is reduced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery module structure design method based on energy flow analysis. Background technique [0002] With the rapid development of the new energy vehicle industry, the number of electric vehicles continues to grow. As an important part of electric vehicles, the safety of battery packs must be considered. Generally, battery packs include multiple battery modules, and a battery module is composed of multiple single cells. When a single battery is squeezed and pierced by external force, heated by an external heat source, short-circuited inside and outside the battery, etc., an uncontrollable chain heat-generating chemical reaction will occur inside the single battery, which is called the thermal runaway reaction of the battery. . In a battery module or battery pack, if a thermal runaway reaction of a single battery causes thermal runaway reactions of other single batteries to o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F111/04G06F119/08
CPCG06F30/20G06F2111/04G06F2119/08Y02E60/10
Inventor 郑岳久金昌勇姚健来鑫孙涛沈凯周龙
Owner UNIV OF SHANGHAI FOR SCI & TECH
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