Battery pack sandwich shell with negative Poisson's ratio layered quadrilateral energy absorption structure

Abstract

The invention discloses a battery pack sandwich shell with a negative poisson ratio layered quadrilateral energy absorption structure. The battery pack sandwich shell comprises a shell and an energy absorption structure; the energy absorption structure comprises energy absorption units and inverted energy absorption units, and the inverted energy absorption units are arranged between every two adjacent energy absorption units; each energy absorption unit comprises a first energy absorption cell body and a second energy absorption cell body arranged in the first energy absorption cell body; the first energy-absorbing cell body is an isosceles triangle with a concave bottom edge, the concave angle theta1 of the bottom edge is an obtuse angle, and the vertex of the concave angle is located on the angular bisector of the vertex angle of the first energy-absorbing cell body; the second energy-absorbing cell body is an isosceles triangle with a concave bottom edge, the concave angle theta2 of the bottom edge is an obtuse angle, the two bevel edges of the second energy-absorbing cell body are parallel to the two bevel edges of the first energy-absorbing cell body respectively, and a gap is reserved between the concave bottom edge of the second energy-absorbing cell body and the concave bottom edge of the first energy-absorbing cell body; and the three vertexes of the second energy absorption cell body are connected with the three vertexes of the first energy absorption cell body through linear connecting walls correspondingly. The shell is simple in structure and has both the energy absorption effect and the impact resistance.

Description

technical field [0001] The invention belongs to the technical field of auto parts, and relates to an energy-absorbing structure in an auto part, in particular to a battery pack sandwich shell with a negative Poisson's ratio layered quadrilateral energy-absorbing structure. Background technique [0002] In order to protect the environment and reduce energy consumption, more and more electric vehicles appear on the road. Compared with traditional internal combustion engine vehicles, electric vehicles have less noise and less pollution to the environment, but there are problems such as weak battery life and accident-prone power batteries; at the same time, in order to improve battery life and reduce weight, electric vehicles are not durable danger of collision, and the battery part is especially fragile. [0003] The existing protection measures for electric vehicle power batteries include adding springs or anti-collision sponge pads in the battery pack casing, setting sliding...

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Problems solved by technology

[0005] Negative Poisson's ratio structure has better energy absorption effect due to its special mechanical properties. For example, Chinese patent CN103573891 A discloses "a negative Poisson's ratio structural component". The triangular structure with concave on one side has poor stability, low compression and impact resistance, and cannot effectively protect the battery from damage in the event of a collision

[0006] In order to solve the problems of Chinese patent CN 103573891 A's poor stability and weak compression and impact resistance, Chinese patent CN 110541906B discloses "a double arrow type negative Poisson's ratio structure", which provides a Impact-capable porous structure, but it still has the characteristics of traditional negative Poisson's ratio structure, that is, due to the existence of internal voids, its stiffness and impact resistance are greatly limited

[0007] In order to further increase the impact resistance of the negative Poisson's ratio structure, it can be considered to set a filling structure in the porous structure to increase its stiffness and impact resistance, but the setting of the filling structure will inevitably affect the energy absorption of the porous structure, especially for negative Poisson's ratio The setting of the filling structure may directly affect the negative Poisson's ratio effect during the collision deformation process, resulting in the deterioration of the energy absorption effect; therefore, how to balance the energy absorption effect and impact resistance of the negative Poisson's ratio porous energy-absorbing structure Become the difficulty and hot spot of research in the industry

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