DE-102024003720-A1 - Electrical energy storage for a vehicle

DE102024003720A1DE 102024003720 A1DE102024003720 A1DE 102024003720A1DE-102024003720-A1

Abstract

The invention relates to an electrical energy storage device (1) for a vehicle, comprising a housing arrangement (2) which includes a box-shaped housing (2.2) and a housing cover (2.1), and a number of electrically interconnected individual cells (4) arranged in the housing (2.2). According to the invention, the individual cells (4) are received in a cell frame (3), which is arranged at least partially between housing side walls and individual cells (4) arranged at the periphery. A longitudinal side element (3.1) of each longitudinal side of the cell frame (3), which has at least one longitudinal side element (3.1), is designed to run obliquely such that an edge (K1) of at least the respective longitudinal side element (3.1) has a smaller distance to a cell housing (5) of the individual cells (4) arranged at the periphery than an opposite edge (K2) of at least the respective longitudinal side element (3.1) of the cell frame (3).

Inventors

Sebastian Vaupel
Meenakumari Lakshman

Assignees

Mercedes-Benz Group AG

Dates

Publication Date: 20260513
Application Date: 20241113

Claims (10)

Electrical energy storage device (1) for a vehicle with a housing arrangement (2) comprising a box-shaped housing (2.2) and a housing cover (2.1), and a number of electrically interconnected individual cells (4) arranged in the housing (2.2), characterized in that - the individual cells (4) are received in a cell frame (3) which is arranged at least partially between housing side walls and individual cells (4) arranged at the periphery, - a longitudinal side element (3.1) of each longitudinal side of the cell frame (3) having at least one longitudinal side element (3.1) is designed to run obliquely such that an edge (K1) of at least the respective longitudinal side element (3.1) has a smaller distance to a cell housing (5) of the individual cells (4) arranged at the periphery than an opposite edge (K2) of at least the respective longitudinal side element (3.1) of the cell frame (3).
Electrical energy storage device (1) according to Claim 1 , characterized in that a planar reinforcing element (11) is arranged on a flat side of the obliquely extending longitudinal side element (3.1) directed towards the individual cells (4).
Electrical energy storage device (1) according to Claim 1 or 2 , characterized in that at least the respective longitudinal side of the cell frame (3) comprises several longitudinal side elements (3.1) which are designed as stiffening elements of the respective longitudinal side of the cell frame (3).
Electrical energy storage device (1) according to one of the preceding claims, characterized in that an intermediate space (Z) formed at least between the obliquely extending longitudinal side element (3.1) of the cell frame (3) and the cell housings (5) of the individual cells (4) arranged at the edge is filled with a foam (7) which fills the intermediate space (Z) in a form-fitting manner.
Electrical energy storage device (1) according to Claim 4 , characterized in that a plurality of individual cells (4) are electrically interconnected by means of a cell connector unit (8), wherein the cell connector unit (8) is placed on the individual cells (4) and partially encloses the respective cell housing (5), wherein a side element (8.1) of an edge-arranged enclosure facing the space (Z) is longer than further side elements (8.2) of the cell connector unit (8) arranged between the cell housings (5) of adjacent individual cells (4).
Electrical energy storage device (1) according to Claim 5 , characterized in that a receiving element (9) is arranged on one side of the individual cells (4) opposite the cell connector unit (8), which partially surrounds the respective cell housing (5), wherein a wall element (9.1) facing the space (Z) of an edge-arranged enclosure of the receiving element (9) is longer than further wall elements (9.2) of the receiving element (9) arranged between the cell housings (5) of adjacent individual cells (4).
Electrical energy storage device (1) according to Claim 6 , characterized in that the cell frame (3) and/or the cell connector unit (8) and/or the receiving element (9) are made of a glass fiber reinforced plastic or is made of a glass fiber reinforced plastic.
Electrical energy storage device (1) according to Claim 6 or 7 , characterized in that the cell connector unit (8) and/or the receiving element (9) are or is materially connected to the cell housing (5) of the respective individual cell (4).
Electrical energy storage device (1) according to one of the preceding claims, characterized in that the housing cover (2.1) has a stiffening corrugated structure (S1) and/or strut structure (S2).
Electrical energy storage device (1) according to one of the preceding claims, characterized in that a reinforcing element (6) is arranged in a predetermined section of an inner side of the housing cover (2.1).

Description

The invention relates to an electrical energy storage device for a vehicle with a housing arrangement comprising a box-shaped housing and a housing cover, and a number of electrically interconnected individual cells arranged in the housing. From the CN218215568U A cover element for a battery, a battery, and a power utilization device are known. The cover element comprises a cover body and a reinforcing structure. The cover element is used to cover a box body for receiving a battery monomer, and the cover element is provided with a first surface and a second surface arranged oppositely along the thickness direction of the cover body. The reinforcing structure is arranged on the first and second surfaces and is configured to reduce the deformation of the cover element when it is subjected to an impact. The reinforcing structure increases the overall strength of the cover element, and when the cover body is subjected to an impact force, the reinforcing structure can distribute the acting force to reduce its effect on the cover element. The invention is based on the objective of providing an electrical energy storage device for a vehicle. The problem is solved according to the invention by an electrical energy storage device which has the features specified in claim 1. Advantageous embodiments of the invention are the subject of the dependent claims. An electrical energy storage device for a vehicle comprises a housing arrangement consisting of a box-shaped housing and a housing cover, and a number of electrically interconnected individual cells arranged within the housing. According to the invention, the individual cells are accommodated in a cell frame, which is arranged at least partially between housing side walls and individual cells located at the perimeter. A longitudinal side element of each longitudinal side of the cell frame, which has at least one longitudinal side element, is designed to run obliquely such that an edge of at least the respective longitudinal side element is located closer to a cell housing of the individual cells located at the perimeter than an opposite edge of at least the respective longitudinal side element of the cell frame. By designing the longitudinal side element, which forms the longitudinal side of the cell frame, at an angle, deformation of individual cells within the housing assembly resulting from a vehicle collision, particularly a side collision, can be reduced. Specifically, the force resulting from the collision can be distributed evenly throughout the housing assembly, thus largely preventing point loading. In particular, deformation of the individual cells located at the edges is reduced, significantly lowering the risk of damage. This prevents the cell housing of the individual cells from being damaged to such an extent that gas escapes from the cell housing, thereby creating a risk of thermal runaway. In one embodiment, a flat reinforcing element is arranged on a flat side of the sloping longitudinal side element facing the individual cells. This flat reinforcing element serves as additional reinforcement and stiffening, thereby further stiffening the housing against deformation in the event of a collision affecting the electrical energy storage device and thus reducing deformation, particularly of the individual cells located at the edges. The housing assembly is further reinforced by the flat reinforcing element, which is made of metal and/or plastic. In a further embodiment, at least each longitudinal side of the cell frame comprises several longitudinal side elements, which are designed as stiffening elements of the respective longitudinal side of the cell frame. By means of these multiple longitudinal side elements, the cell frame, and thus the housing, in particular the housing assembly, is stiffened and stabilized, so that deformation of the housing assembly in the event of a collision affecting the electrical energy storage device can be reduced, and thus the risk of damage, especially to the individual cells arranged at the edges, can be significantly reduced. In one embodiment, a gap formed at least between the sloping longitudinal side element of the cell frame and the cell housings of the individual cells arranged at the edges is filled with a foam that forms a form-fitting gap. Using this foam, which hardens and forms a form-fitting gap, and which is compressible, a [missing word - likely "body" or "structure"] can be inserted into the housing arrangement. The collision force introduced by the cell is absorbed, so that only a remaining collision force acts on the individual cells, thus significantly reducing the risk of damage to the individual cells. A further development of the electrical energy storage device involves a plurality of individual cells being electrically interconnected by means of a cell connector unit. This cell connector unit is mounted on the individual cells and partially encloses the respective cell housing. A side element of