EP3874548A1

EP3874548A1 - Module element for a battery module, and battery module

Info

Publication number: EP3874548A1
Application number: EP19798215.0A
Authority: EP
Inventors: Hartmut Wolf; Weiwei Zhao; Holger FIELON
Original assignee: Kautex Textron GmbH and Co KG
Current assignee: Kautex Textron GmbH and Co KG
Priority date: 2018-10-31
Filing date: 2019-10-30
Publication date: 2021-09-08
Also published as: WO2020089298A1; US20210408630A1; CN112956070A; DE102018127308A1; CN112956070B

Abstract

The invention relates to a module element (200) for a battery module (100) for receiving battery cells (10) of the battery module (100), comprising a first module element part (22) and a second module element part (23), wherein the first module element part (22) is connected to the second module element part (23), wherein the first module element part (22) comprises a first base body (24) and a first organosheet (25) arranged on the first base body (24) and wherein the second module element part (23) comprises a second base body (26) and a second organosheet (27) arranged on the second base body (26).

Description

Plate element for a battery module and battery module

The invention relates to a plate element for a

Battery module for holding the battery cells of the

Battery module. The invention further relates to a

Battery module for arrangement in a battery housing.

For positioning several battery cells, also called pouch cells, arranged in one package in one

Battery module, the battery cells between them

oppositely arranged plate elements of the

Battery module, also called end plates, can be arranged by accommodating the battery cells between the two plate elements. Such a battery module can then in a battery housing of a battery, for example a battery for driving a hybrid vehicle or

Driving a pure electric vehicle, may be arranged. The plate elements have the task, among other things, of a battery module and thus the battery cells

Battery module in the battery case at the desired

Position and hold position. The plate elements can accommodate dynamic load conditions.

It is currently known to make the plate elements from one

to form one-piece aluminum element.

However, such plate elements are very heavy, which means that the battery module and therefore the entire battery are very heavy. There is also a Plate element made of an aluminum element is expensive and complex to manufacture.

The invention is therefore based on the object

To provide plate element and a battery module, which is characterized by a reduced weight

at the same time distinguish high stability.

The object is achieved with the features of

independent claims solved. Appropriate refinements and advantageous developments of the invention are in the

Subclaims specified.

The plate element according to the invention is characterized in that it has a first plate element part and a second plate element part, the first

Plate element part with the second plate element part

is connected, wherein the first plate element part has a first base body and a first organic sheet arranged on the first base body, and wherein the second

Plate element part has a second base body and a second organic sheet arranged on the second base body.

The plate element according to the invention is now no longer formed in one piece, but instead has a sandwich structure in which several layers of material are stacked on top of one another. The plate element is made of two

Plate element parts formed, which are manufactured separately from each other and after the manufacture of the two

Plate element parts are first connected to each other to form the plate element. In the connected state, the plate element parts preferably abut one another with their longitudinal side surfaces. Both plate element parts each have a base body and an organic sheet arranged on the base body. The organic sheets each have Fiber fabric or a non-woven fabric, which in a

thermoplastic plastic matrix are embedded.

Organic sheets are particularly low

Weight combined with high strength and rigidity. The organic sheet preferably has carbon fibers which are embedded in a thermoplastic plastic matrix. The thermoplastic plastic matrix of the organic sheet can be formed, for example, from polyamide, in particular from polyamide 6. By using organic sheets, the plate element parts and thus the plate element can be given particularly good strength against bending without the plate element having to be made of a metal material. In addition to the high strength and rigidity, it can be achieved that the weight of the plate element is significantly greater than that of conventional plate elements

Metal materials can be reduced. The organic sheet preferably lies flat on the base body.

The first plate element part and the second plate element part are preferably connected to one another in such a way that the first organic plate forms at least a partial area of a first outer surface of the plate element and the second organic plate forms at least a partial area of a second outer surface of the plate element opposite the first outer surface. The organic sheets are thus preferably arranged on the outside of the plate element, so that the

Organic sheets can have a particularly good stabilizing effect on the plate element. Due to the arrangement of the organic sheets on the outside, particularly good bending strength of the plate element can be achieved. In the connected state, the base bodies of the two plate element parts then preferably lie flat against one another.

In order to further reduce the weight of the plate element and also the processability and manufacturability of the To further improve the plate element, the first base body and / or the second base body can be made from one

thermoplastic material. The thermoplastic material can for example be a polyamide, in particular a polyamide 6. The first base body and the second base body are preferably formed from a thermoplastic material. The first base body and the second are then particularly preferred

Basic body made of the same thermoplastic

Plastic material formed, whereby a particularly good connection between the two plate element parts can be formed via the two base bodies. Through the

Formation from a thermoplastic material, the first base body and / or the second base body can be produced in an injection molding process and thus a

Be an injection molded part.

The first thermoplastic material

The base body and / or the thermoplastic material of the second base body can have a fiber reinforcement. The fiber reinforcement can be formed in that

Fibers, preferably short fibers, are embedded in the thermoplastic material of the base body. For example, glass fibers can be used for fiber reinforcement. Due to the fiber reinforcement, the strength and

Stability of the base body and thus the plate element part and the entire plate element can be further improved.

In order to be able to further reduce the weight of the plate element and at the same time maintain high strength and rigidity, it can be provided that the first base body and / or the second base body has a rib structure. The rib structure preferably has both transverse and longitudinal ribs. The rib structure extends

preferably over an entire longitudinal side surface and thus over the entire length and width of the first and / or the second base body. The rib structure is preferably formed on the longitudinal side surface of the respective base body, which is opposite to the longitudinal side surface of the

is arranged on which the

Organic sheet is arranged so that the organic sheet on a first longitudinal side surface and the rib structure on a second opposite the first longitudinal side surface

Longitudinal side surface of the respective base body is arranged. The rib structure is preferably in one piece with the

the respective base body, so that the rib structure is directly involved in the formation of the base body

can be trained.

Particularly preferably, the first base body and the second base body each have a rib structure, wherein ribs of the rib structure of the first base body can be connected to ribs of the rib structure of the second base body to form the connection of the first plate element part to the second plate element part. If both base bodies have a rib structure, the two plate element parts are thus preferably connected via the

Rib structures. One rib of the rib structure of the first base body is preferably connected to one rib of the rib structure of the second base body. in the

connected state preferably butt the ribs of the

Rib structure of the first base body on the ribs of the rib structure of the second base body, so that the ribs of the rib structure of the first base body are preferably flat on the ribs of the rib structure of the second

Base body rest. The ribs of each

Rib structure preferably have the same wall thickness. The first plate element part is with the second

Plate element part preferably integrally connected.

Due to the integral connection, a particularly firm and in particular permanent connection between the

Plate element parts are formed. The integral connection can be formed, for example, by means of a welded connection. The welded connection can be formed, for example, by means of an infrared welding process. If the first base body and the second base body each have a rib structure, it is preferably provided that the ribs of the rib structure of the first base body are welded to the ribs of the rib structure of the second base body.

Furthermore, it can preferably be provided that the first

Base body with the first organic sheet and / or that the second base body is integrally connected to the second organic sheet, so that also between the organic sheet and

Base body is a fixed, in particular permanent connection.

It can be provided that the first base body is molded onto the first organic sheet and / or that the second base body is molded onto the second organic sheet. By injecting the base body onto the organic sheet, a positionally accurate, unchangeable positioning of the

Organic sheet can be reached on the base body.

Functional elements or functional areas can preferably be integrated into the plate element.

For example, at least one tensioning strap guide can be integrated in the plate element, in which a tensioning strap of a battery module can be guided. It can preferably be provided that on the first

Organic sheet or on the second organic sheet at least one strap guide in the form of a groove-shaped recess

is trained. The tensioning band guide is preferably formed on the organic sheet which, when the plate element is installed, is arranged in the battery module on an outwardly facing side of the battery module. The

Tensioning strap can be in the groove-shaped recess of the

Tensioning strap guide must be positioned so that the tensioning strap cannot slip. Two or more tension band guides are preferably formed on the first or second organic sheet, the tension band guides preferably each running parallel to one another

are trained.

In order to be able to achieve a particularly good stiffness of the organic sheets and thus of the plate element, at least 70%, preferably at least 80%, are preferred

preferably at least 90% of fibers contained in the first organic sheet and / or in the second organic sheet are oriented in a main stress direction of the plate element. The main direction of stress is preferably that

Main direction of loading of the plate element. Know that

Organo sheet on a strap guide, at least 70% of the fibers are preferably aligned in the same direction as the groove-shaped recess of the strap guide. This can also be used, in particular, in the area of the strap guide

due to the increased forces acting there on the

Plate element a particularly good stability of the

Plate element can be achieved. In addition, a

such orientation of the fibers of the organic sheets in

Main stress direction a smaller wall thickness in the

Cover layers of the organic sheet, thereby a reduced material expenditure for the organic sheet and thereby further reducing the weight of the organic sheet. In order to be able to further increase the stability of the plate element, in particular in the area of a tensioning band guide, the

Area of the strap guide the number of ribs of the

Rib structure of the first base body and / or the number of ribs of the rib structure of the second base body can be increased. The density of the ribs of a rib structure can thus be higher in the area of the tension band guide than in the remaining area of the respective base body.

Functional elements can be integrated directly into the plate element. For example, with a

Injection molding process of the first main body and / or the second main body functional elements are injected directly into the respective main body.

For example, the plate element can be inserted into the first

Have plate element part and / or fixing element integrated in the second plate element part for fixing the plate element or the battery module, for example in a battery housing. The fixing element can then preferably in the first base body and / or in the second base body

be integrated. The fixing element can, for example, form a fixed bearing or a support.

The object according to the invention is also achieved by means of a battery module for arrangement in one

Battery case. According to the invention, the battery module has a plurality of battery cells and two located opposite one another

arranged plate elements, the plurality

Battery cells between the two opposite each other

arranged plate elements are included, the plate elements as described above, and

are trained. It is preferably provided that at least one tension band is provided, which has the two plate elements and the plurality arranged between the plate elements

Battery cells spanned, with the strap in the

Tension band guide of the plate elements can be performed.

The invention is explained in more detail below with reference to the attached drawings using preferred embodiments.

Show it:

Fig. 1 is a schematic representation of a

Battery module unit according to the invention,

2 shows a schematic illustration of a plate element according to the invention in a plan view of a first side face of the plate element,

Fig. 3 is a schematic representation of that shown in Fig. 2

Plate element in a plan view of a second side surface of the plate element,

Fig. 4 is a schematic representation of a body of a

Plate element part of that shown in Figs. 2 and 3

Plate element,

Fig. 5 is a schematic sectional view

Plate element along the line shown in Fig. 3

A-A,

6 shows a schematic illustration of a plate element with the direction of extension of the fibers of the organic sheet indicated by arrows, and Fig. 7 is a schematic representation of that shown in Fig. 1

Battery module with fixing elements provided on the plate elements.

1 schematically shows a battery module 100 which, in a battery housing (not shown here), contains a battery, in particular a battery for driving a battery

Motor vehicle, such as a hybrid vehicle or a purely electric vehicle, can be arranged.

The battery module 100 has a plurality of battery cells 10, which are arranged one behind the other in the embodiment shown here.

Furthermore, the battery module 100 has two plate elements 200, between which the battery cells 10 are arranged. The two plate elements 200 are opposite one another

arranged so that they accommodate the battery cells 10 between them. The plate elements 200 form so-called

End plates of the battery module 100 out.

In order to be able to hold the battery cells 10 securely between the plate elements 200, the battery module 100 also has a plurality of tensioning straps 11. The one shown here

Three straps 11 are provided, which are arranged running parallel to one another. The

Tensioning straps 11 span the two plate elements 200 and those arranged between the two plate elements 200

Battery cells 10. A clamping band guide 20 in the form of a groove-shaped depression is formed on the plate elements 200 for each clamping band 11, within which the clamping bands 11 are guided.

FIG. 2 shows a plate element 200, as shown in FIG. 1, in a plan view of a first side surface 21 of the Plate element 200. This first side surface 21, which is a longitudinal side surface of plate element 200, forms an outer side of battery module 100 in an assembled state of the battery module, as shown in FIG. 1.

The plate element 200 has a first plate element part 22 and a second plate element part 23 which are connected to one another, in particular are integrally connected to one another.

The first plate element part 22 has a first base body 24 and a first organic sheet 25 arranged on the first base body 24.

The second plate element part 23 has a second one

Base body 26 and one on the second base body 26

arranged second organic sheet 27, as can be seen in particular in FIG. 3. FIG. 3 shows a plan view of a second side surface 28 of the plate element 200 opposite the first side surface 21. The second

Side surface 28 is in the assembled state of the battery module 100, as can be seen in FIG. 1, in the direction of

Battery cells 10 arranged directed.

As can be seen in FIGS. 2 and 3, the two are

Plate element parts 22, 23 connected to one another in such a way that the first organic sheet 25 is a partial area of a first

Forms outer surface of the plate element 200, which is equal to the first side surface 21 of the plate element 200, and that the second organic sheet 27 forms a portion of a second outer surface of the plate element 200, which is equal to the second side surface 28 of the plate element 200. The two organic sheets 25, 27 are thus on the outside of the

Plate element 200 arranged. The organic sheets 25, 27 shown in FIGS. 2 and 3 each extend over a partial area of the respective outer surface or side face 21, 28 of the plate element 200, so that they also only extend over a partial area of the respective one

Base body 24, 26 extend. As in Figs. 2 and 3 too

can be seen, the organic sheets 25, 27 each extend over the entire width B of the respective base body 24, 26, but not over the entire length L and thus only over a partial length of the respective base body 24, 26. The size of the organic sheets 25, 27 is preferably selected such that the organic sheets 25, 27 cover the area of the plate element 200 on which the battery cells 10 are separated from the

Plate element 200 are accommodated, so that particularly good stability of the battery cells 10 is achieved

Plate element 20 is formed by the organic sheets 25, 27.

The organic sheets 25, 27 each have a fiber fabric or a fiber fabric, which are in a thermoplastic

Plastic matrix are embedded. The fiber fabric or

Fiber fabric is made of carbon fibers, for example

educated. The thermoplastic plastic matrix is made, for example, of polyamide, in particular polyamide 6

educated .

The base bodies 24, 26 can each be formed as an injection molded part made of a thermoplastic material. Like the plastic matrix of the organic sheets 24, 26, the thermoplastic material can be made from polyamide, in particular from polyamide 6. To the

To increase the stability of the base bodies 24, 26, these can have a fiber reinforcement, for example

Glass fibers are introduced into the thermoplastic material of the base body 24, 26. When the plate element 200 is manufactured, the two plate element parts 22, 23 are first produced and

formed before they are joined together to form the finished plate member 200.

To manufacture and form the plate element parts 22, 23, the organic sheets 25, 27 are first shaped and

educated. The organic sheet 25, 27 is then placed in an injection molding tool and the organic sheet 25, 27 is overmolded on one side by a thermoplastic material which forms the base body 24, 26. The

Base body 24, 26 is thus injection molded onto the organic sheet 25, 27 in order to form the respective plate element part 22, 23. If the two plate element parts 22, 23 are finished, they are then made via the two base bodies 24,

26 connected to each other. In the connected state of the two plate element parts 22, 23, the two base bodies 24, 26 are thus connected to one another.

The connection of the two plate element parts 22, 23 and thus of the two base bodies 24, 26 to one another is preferably carried out by forming a material connection,

for example by welding the two plate element parts 22, 23 together. However, it is also possible to glue the two plate element parts 22, 23 to one another in order to achieve a material connection between the two

Form plate element parts 22, 23.

As can be seen in FIGS. 4 and 5, the two have

Base body 24, 26 has a rib structure 29, 30, which is in each case formed from a multiplicity of ribs 31, 32, the ribs 31, 32 being designed as transverse ribs and as longitudinal ribs. The rib structure 29, 30 extends over the entire length L and the entire width B of the respective base body 24, 26. The connection of the two plate element parts 22, 23 takes place via the rib structure 29, 30 of the base body 24, 26, in that, as can be seen in FIG. 5, the ribs 31 of the

Rib structure 29 of the first base body 24 are connected to the ribs 32 of the rib structure 30 of the second base body 26. In the connected state, the ribs 31 of the rib structure 29 of the first base body 24 thus encounter the ribs 32 of the rib structure 30 of the second base body 26, so that the ribs 31 of the rib structure 29 of the first base body 24 lie flat on the ribs 32 of the rib structure 30 of the second base body 26 rest, as can be seen in FIG. 5.

As can be seen, for example, in FIGS. 2, 5 and 6, the tension band guide 20 is formed in the first organo sheet 25 of the first plate element part 22 since it is installed

State of this first organic sheet 25 is directed outwards. The groove-shaped depression of the tension band guide 20 is thus formed in the first organic sheet 25.

In the embodiment shown here there are three

Strap guides 20 formed. As can be seen in FIG. 5, the number of ribs 31 of the rib structure 29 of the first base body 24 and the number of ribs 32 of the rib structure 30 of the second base body 26 are increased in the region of the tensioning band guides 20, so that in the region of the

Strap guides 20, the ribs 31, 32 are arranged closer together.

The fibers of the fiber fabric or fiber fabric of the organic sheets 25, 27 are largely aligned in the main stress direction R of the plate element 200, so that more than 80% of the fibers of the organic sheets 25, 27 extend in the main stress direction R, as indicated in FIG. 6 by the arrows , the main stress direction R along the width B of the Plate element parts 22, 23 and thus run along the width of the plate element 200. The main voltage direction R thus runs in the same direction as that

Longitudinal extension of the groove-shaped depressions

Strap guides 20.

By forming the base body 24, 26 of the

Plate element parts 22, 23 made of a thermoplastic

Plastic material can be functional elements, such as

For example, connecting elements 33 for module units, not shown here, are integrated directly into the base body 24, 26 and thus into the plate element parts 22, 23 and the plate element 200 during manufacture. The

Functional elements can be formed, for example, in one piece with the base body 24, 26, like that

Connecting element 33, or they can also be inserted as an insert into the injection molding tool and at

Injection molding of the base body 24, 26 is encapsulated by the material of the base body 24, 26.

As shown in FIG. 7, fixing elements 34, 35, 36 can also be used as functional elements in the plate element part 22, 23, in particular in the base body 24, 26

Plate element parts 22, 23 can also be integrated, which are used to fix the plate element 200 and thus the entire

Battery module 100 can serve during an assembly process. Furthermore, a support 37 can also be integrated into the plate element part 22 and / or 23 as a functional element, as shown in FIG. 7.

The fixing element 34 forms a fixed bearing and that

Fixing element 35 forms a support, so that the two fixing elements 35, 36 a rotational movement of the

Can prevent battery module 100 in the battery housing. Reference sign

100 battery module

200 plate element

10 battery cell

11 strap

20 strap guide

21 First side surface

22 First plate element part

23 Second plate element part

24 First basic body

25 First organic sheet

26 Second basic body

27 Second organic sheet

28 Second side surface

29 rib structure

30 rib structure

31 rib

32 rib

33 connecting element

34 fixing element

35 fixing element

36 fixing element

37 supports

L length

B width

R main stress direction

Claims

1. plate element (200) for a battery module (100)

Inclusion of battery cells (10) of the battery module (100) with

a first plate element part (22) and

a second plate element part (23),

the first plate element part (22) being connected to the second plate element part (23),

wherein the first plate member part (22) has a first

Has base body (24) and a first organic sheet (25) arranged on the first base body (24) and

wherein the second plate element part (23) has a second base body (26) and a second organic sheet (27) arranged on the second base body (26).

2. Plate element (200) according to claim 1, characterized

characterized in that the first plate element part (22) and the second plate element part (23) are connected to one another in such a way that the first organic plate (25) has at least a portion of a first outer surface of the

Plate element (100) and the second organic sheet (27) forms at least a portion of a second outer surface of the plate element (100) opposite the first outer surface.

3. plate element (200) according to claim 1 or 2, characterized

characterized in that the first base body (24) and / or the second base body (26) is formed from a thermoplastic material.

4. plate element (200) according to claim 3, characterized

characterized that the thermoplastic

Plastic material of the first base body (24) and / or the thermoplastic material of the second

Base body (26) has a fiber reinforcement.

5. plate element (200) according to any one of claims 1 to 4,

characterized in that the first base body (24) and / or the second base body (26) has a rib structure (29, 30).

6. plate element (200) according to claim 5, characterized

characterized in that the first base body (24) and the second base body (26) each have a rib structure (29,

30), whereby to form the connection of the first plate element part (22) with the second

Plate element part (23) ribs (31) of the rib structure (29) of the first base body (24) with ribs (32)

Rib structure (30) of the second base body (26) are connected.

7. plate element (200) according to any one of claims 1 to 6,

characterized in that the first plate element part (22) is integrally connected to the second plate element part (23).

8. plate element (200) according to any one of claims 1 to 7,

characterized in that the first base body (24) is injection molded onto the first organic sheet (25) and / or that the second base body (26) is injection molded onto the second organic sheet (27).

9. plate element (200) according to any one of claims 1 to 8,

characterized in that at least one on the first organic sheet (25) or on the second organic sheet (27)

Tension band guide (20) is designed in the form of a groove-shaped recess.

10. plate element (200) according to any one of claims 1 to 9, characterized in that at least 70% of fibers contained in the first organic sheet (25) and / or in the second organic sheet (27) in a main tension direction (R) of the plate element ( 200) are aligned.

11. plate element (200) according to claim 9 or 10, characterized

characterized in that in the area of the tensioning band guide (20) the number, the number of ribs (31) of the rib structure (29) of the first base body (24) and / or the number of ribs (32) of the rib structure (30) of the second

Base body (26) is increased.

12. plate element (200) according to any one of claims 1 to 11, characterized by at least one in the first

Plate element part (22) and / or in the second

Plate element part (23) integrated fixing element (34, 35) for fixing the plate element (200).

13. Battery module (100) for arrangement in a battery housing, with

several battery cells (10) and

two plate elements (200) arranged opposite one another,

wherein the plurality of battery cells (10) are accommodated between the two plate elements (200) arranged opposite one another,

characterized in that the plate elements (200) are designed according to one of claims 1 to 12.

14. Battery module (100) according to claim 13, characterized

characterized in that at least one tensioning strap (11)

It is provided which spans the two plate elements (200) and the battery cells (10) arranged between the two plate elements (200), the tensioning band (11) in the tensioning band guide (20) of the plate elements (200) is guided