Battery module capable of delaying heat diffusion and battery pack

Abstract

The invention relates to a battery module capable of delaying heat diffusion and a battery pack. The battery module comprises multiple groups of stacked battery cells, a module upper cover and a fireproof heat insulation pad, wherein the fireproof heat insulation pad is arranged between top sealing edges of the multiple groups of battery cells and the module upper cover, multiple heat diffusion openings are formed in the fireproof heat insulation pad, and the heat diffusion opening is connected with a door-shaped structure for opening or closing the heat diffusion opening; multiple heat diffusion holes are formed in the module upper cover, and the multiple heat diffusion holes and the multiple heat diffusion openings are arranged in a one-to-one correspondence manner; and a closed heat diffusion channel is formed between each group of battery cells and the fireproof heat insulation pad through the sealing structure, and the heat diffusion channel at least corresponds to one heat diffusion opening. When a single battery cell is subjected to thermal runaway, the edge sealing position where thermal runaway eruption is not expected to occur is pressed by the fireproof heat insulation pad to prevent the non-target eruption position from being broken and erupted and prevent high-temperature gas or flame from rushing the door-shaped structure to erupt, so that the influence on other groups of battery cells can be reduced, the thermal runaway of other groups of battery cells is delayed, and even other battery cells are not triggered to generate thermal runaway.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery module and a battery pack for delaying thermal diffusion. Background technique [0002] As the main source of power for new energy electric vehicles, power batteries are more and more popular in the market for safe, reliable, and high-energy-density battery modules. However, during the use of the power battery, the thermal runaway of the battery caused by overcharging, acupuncture, heating and abuse, etc., always endangers the lives and property of passengers. , How to delay the thermal diffusion time after the thermal runaway of the power battery occurs has become an urgent problem for manufacturers to solve. [0003] At present, most of the markets on the market use mica sheets or spray fireproof coatings between the internal modules of the battery pack and between the modules and the upper cover of the box to delay the time when the upper cover of the battery pack...

AI Technical Summary

Problems solved by technology

This technology has the following defects: 1. The protective measures on the battery module are not effective enough to effectively delay the time of thermal diffusion after the thermal runaway of the battery pack occurs; 2. Thermal runaway occurs in a single cell of the battery pack At this time, since the sealing strength of each position of the edge sealing of the pouch battery is the same, any position of the tab edge sealing of the battery cell may become an eruption port, and the pouch battery does not have a definite eruption direction when the heat is out of control, so it cannot be effectively It prevents the diffusion to the surrounding batteries, so it cannot effectively delay the thermal diffusion time after the thermal runaway of the battery pack occurs, and usually cannot meet the national standard requirements of 5 minutes without open flames

Images