DE102022116265A1 - Method for making a battery assembly and assembly device - Google Patents

Abstract

The present invention relates to a mounting device (1) for mounting a stack (12) of pouch cells (8) in a battery arrangement (100), comprising a plurality of biasing bodies (2) which can be displaced relative to one another in a stacking direction (3). Cell receptacles (4) arranged next to one another in the stacking direction (3) and displaceable relative to one another in the stacking direction (3) for accommodating one pouch cell (8), the biasing bodies (2) being designed and set up in the stacking direction (3) between a loading state and to be displaceable in a biasing state, wherein in the assembly state a distance (11 ') of the biasing bodies (2) from one another in the stacking direction (3) is greater than a sum of the thicknesses of the plurality of pouch cells (8) to be accommodated in the stacking direction (3), and In the preloading state, in order to exert a preloading on the pouch cells (8) accommodated in the cell receptacles (4), the preloading bodies (2) are moved towards one another from their position in the assembly state, so that a length (11) of the clamped stack (12) is of Pouch cells (8) is smaller than an installation length of the stack (12) of pouch cells (8) in the state of the stack (12) installed in the battery arrangement (100), the mounting device (1) being designed and set up, in Preload state for inserting the clamped stack (12) into a battery housing (13) to be insertable transversely to the stacking direction (3), and after inserting the stack (12) by releasing the preload on the stack (12) from the battery housing (13) to be removable. The present invention also relates to a method for producing a battery assembly.

Description

Technical area

The present invention relates to a method for producing a battery arrangement and a mounting device for mounting a stack of pouch cells in a battery arrangement, for example a battery arrangement for providing the primary drive energy of an electric vehicle.

State of the art

It is known to provide batteries with a specified current and voltage by interconnecting individual battery cells. When creating a pouch cell module, individual pouch (battery) cells are conventionally positioned relative to one another and stacked using a tension mat and an adhesive film. The contact tabs, hence the pole contacts of the pouch cells, are then individually threaded onto a grid frame-like component on one side of the stack obtained by stacking the pouch cells. The same process of threading then takes place on the other side. In a subsequent production process, the contact tabs are bent in preparation for welding them. Pouch cells are often used in smaller units in separate housings, in so-called battery modules.

In order to hold the pouch cells in a battery module in the intended position, it is known to clamp the pouch cells or the stack of pouch cells lined up in a stacking direction against one another using a clamping frame in the stacking direction. In other words, a compressive force acts on the stack of pouch cells, which is applied on both sides by end plates housing the stack in the stacking direction, which are pressed against the stack via clamping elements running in the stacking direction on both sides of the stack.

Conventional battery (module) arrangements, in which a clamping frame comprising rods for clamping is provided for clamping the cells into a stack, and which remains in the battery (module) arrangement after production, can, for example EP 3 631 877 A1 , the DE10 2016 118 977 or the US 9,225,035 B1 B4 can be removed. The battery cells are clamped in the clamping frame before they are inserted into the battery housing. The clamping frames remain permanently in the arrangement as part of the battery module.

Key technical parameters, also known as “Key Performance Indicators” (KPI) for batteries, for battery development are in particular the gravimetric energy density and the volumetric energy density. The gravimetric energy density is a specific quantity that indicates how much energy can be stored per unit weight (i.e. based on the mass) of the battery. It has the unit “kilowatt hours per kilogram” (kWh/kg). The higher the gravimetric energy density, the lighter a battery is with the same amount of energy that can be stored. The volumetric energy density indicates how much energy can be extracted from a battery per unit volume. It has the unit “kilowatt hours per liter” (kWh/L). The higher the volumetric energy density, the smaller the size of a battery with the same amount of energy that can be stored. The energy density in general can be used to determine how long an electric vehicle can drive before it needs to be charged, in contrast to the power density, which is a measure of the acceleration ability of an electric vehicle.

The smaller a battery arrangement with battery modules is, the lower the volumetric and, in particular, the gravimetric energy densities. Since each battery module includes a clamping frame, these significantly worsen the aforementioned energy densities, particularly in battery arrangements with a plurality of battery modules.

Alternatively, pouch cells can be stacked directly in a housing, with part of the housing acting as part of a tension frame. Conventional methods for producing such battery arrangements are complicated and cycle time-intensive. The pouch cells must be inserted individually into the housing and then prestressed, contacted and fixed in a poorly accessible and narrow space between the inner wall of the housing, other components accommodated therein and/or adjacent cell stacks.

Presentation of the invention

Based on the known prior art, it is an object of the present invention to provide an improved method for producing a battery assembly, as well as a mounting device for mounting a stack of pouch cells in a battery assembly.

The object is achieved by a method for producing a battery arrangement with the features of claim 1. Advantageous developments of the method result from the subclaims, the description and the figures.

Accordingly, a method for producing a battery arrangement is proposed, comprising the provision of a plurality of cell receptacles arranged next to one another in the stacking direction between two biasing bodies which can be displaced relative to one another in a stacking direction and which can be displaced relative to one another in the stacking direction for receiving one pouch cell each in an assembly state, the insertion of a A plurality of pouch cells in the cell receptacles, the prestressing of the pouch cells with a predetermined pretension by approaching the pretensioning bodies towards one another from their position in the assembly state, so that a length of the stack of pouch cells clamped thereby is smaller than a predetermined installation length of the Stack of pouch cells in the state of the stack installed in the battery arrangement, inserting the stack of pouch cells held by the preload in the cell receptacles into a battery housing transversely to the stacking direction, releasing the preload exerted by the preload bodies on the clamped stack, and removing the assembly of cell holders and preload bodies from the housing.

In the proposed method, the pouch cells are combined into a stack outside of their final position when installed. This makes them particularly easy to position and their contact tabs are easily accessible. This enables simple and precise handling of the pouch cells and the contact lugs, especially with regard to their interconnection and contacting outside of a housing in which they are inserted when installed.

In addition, in comparison to conventional methods in which each battery module has its own module housing and/or a clamping frame structure that covers the pouch cells, a thermal advantage can be achieved in the overall system. The stack of pouch cells can, for example, be embedded directly in the housing with thermally conductive adhesive and, in comparison to conventional solutions, certain components and the tolerance chains associated with them can be dispensed with.

Furthermore, simple and precise positioning of the prefabricated stack of pouch cells in the housing can be achieved with little fixation effort compared to conventional solutions.

The elimination of complex, precise individual parts as provided in conventional solutions, for example module housings or clamping frames for clamping the stack of pouch cells, as well as the elimination of production processes that require a lot of cycle time and the elimination of the logistics required for conventional processes due to the elimination of individual or intermediate products, especially in battery module production, also result in a cost advantage for the proposed method.

Furthermore, increased quality in production can also be achieved due to the elimination of individual parts. In addition, battery arrangements produced by the method according to the invention have a high gravimetric energy density and an advantageous volumetric energy density.

The fact that the pouch cells inserted into the cell receptacles are prestressed with a predetermined bias voltage, so that the length of the thereby clamped stack of pouch cells held in the receptacles is smaller than a predetermined installation length of the stack of pouch cells in the battery arrangement When the stack is installed, the stack of pouch cells can be inserted freely into the battery housing, in other words with play. By releasing the pre-stress exerted by the pre-stressing bodies on the clamped stack, the stack of pouch cells is enlarged in the stacking direction due to elasticity, so that the ends of the stack in the stacking direction abut against stop elements provided in the housing, and the stack of pouch cells between the Stop elements are braced in the stacking direction. To provide the preload, the distance between the opposing stop elements in the housing in the stacking direction, which corresponds to the installation length of the stack, must be made smaller by a predetermined amount than a length of the stack that it would have in an unstressed state of the pouch cells. In this way, the stack of pouch cells can be inserted precisely into the battery housing in a simple manner, and the assembly of cell holders and biasing bodies can be removed from the battery housing, so that this has no negative effects on the specific energy densities.

In addition, the vibration behavior of the battery arrangement can be improved in comparison to conventional arrangements, since the mass fixation, i.e. the power flow, of the stack does not take place via additional connecting elements such as screw connections, but rather it is clamped directly into the battery housing and preferably also glued directly.

According to a preferred embodiment, after prestressing the pouch cells to form a stack of tensioned pouch cells, the contact tabs of the plurality of pouch cells protruding laterally from the pouch cells in the stacking direction can be Cells are electrically contacted with one another, preferably via a permanent connection of at least two adjacent contact lugs, particularly preferably via welding, wherein preferably the pouch cells are electrically connected in series, and / or that at least one high-voltage contact is connected to a contact lug of one of the pouch cells becomes. After prestressing, the pouch cells in the stack essentially have the position intended in the installed position relative to one another, so that connection can take place without tensile stresses being present on the contact tabs in the installed state.

Since the stack is not yet inserted into the battery housing, the contact tabs of the stack are essentially freely accessible. A simple, inexpensive, precise and robust process can be used to connect or contact them, for example a roll welding process.

Accordingly, a sensor contact for cell voltage monitoring and/or temperature monitoring, preferably in the form of a film contact, can also be attached to at least one contact tab of the plurality of pouch cells in a simple manner, as provided according to a further embodiment, and/or at least based on one An insulating film is applied to the stacking direction on the lateral side of the stack of pouch cells, preferably via at least one contact tab of the plurality of pouch cells.

According to a further embodiment, before the prestressing body is applied by the prestressing bodies, an end plate can be inserted between at least one prestressing body and the plurality of cell receptacles into an end plate receptacle that is relatively displaceable to the plurality of cell receptacles, with an end plate preferably being placed between both prestressing bodies and the plurality of cell receptacles is used. The end plates allow the preload to be applied to the pouch cells particularly precisely. The end plates preferably form part of the stack of pouch cells, which remain in the battery housing together with the pouch cells after the assembly of the receptacles has been removed. Accordingly, the prestressed stack of pouch cells also includes the at least one end plate. In other words, the at least one end plate forms a termination of the stack at least on one end side or front side of the stack in the stacking direction.

According to a further embodiment, before the prestressing is applied by the prestressing bodies, at least one intermediate wall dividing the plurality of pouch cells in the stacking direction can be inserted or arranged between the plurality of cell receptacles in an intermediate wall receptacle that is relatively displaceable to the plurality of cell receptacles. Accordingly, the prestressed stack of pouch cells then also includes the at least one intermediate wall. The intermediate wall can serve to improve the distribution of the preload on the pouch cells in the stack.

According to a further embodiment, the insertion of the prestressed stack into the housing can be carried out in a guided manner, with the prestressed stack preferably having at least one guide region which can be inserted into a corresponding guide section on the battery housing, with preferably at least one end plate and/or at least one intermediate wall in the clamped stack has at least one management area. Accordingly, the stack can be inserted in a precise position by interacting with its at least one guide region and the at least one guide section of the battery housing. Preferably, the corresponding guide areas and guide sections each form mutually acting stops in the stacking direction, the stack being held in an inserted state and clamped in the battery housing by the guide areas designed as a stop in the stacking direction after the preload has been released by the preloading bodies due to their striking against the guide sections of the battery housing becomes.

According to a further embodiment, at least the pouch cells of the stack can be glued to the battery housing, with an adhesive, preferably a thermally conductive adhesive, being applied before, during and/or after the clamped stack is inserted into the battery housing and/or on at least one side of the battery housing braced stack is applied, and / or the pouch cells are at least partially cast with the housing with a casting compound, preferably an expanding, at least partially hardening foam material, the casting compound preferably being an expanding and / or heat-conducting and / or electrically insulating casting compound .

According to a further embodiment, after inserting the pouch cells into the cell holders and before clamping, a positioning plate can be brought into contact with the pouch cells transversely to the stacking direction in order to bring the pouch cells into a predetermined position relative to one another. In particular, it can be achieved that all pouch cells of the stack are on the side facing the positioning plate, which is opposite to the direction When the pouch cells are inserted into the cell holders, they are positioned as intended. In the installed position of the stack, this side preferably corresponds to the side with which the pouch cells are in thermal contact with a temperature control device of the battery arrangement and/or a bottom of the battery housing.

The above-mentioned object is further achieved by a mounting device for mounting a stack of pouch cells in a battery arrangement with the features of claim 9. Advantageous further developments result from the subclaims, the description and the figures.

Accordingly, a mounting device for mounting a stack of pouch cells in a battery arrangement is proposed, comprising a plurality of cell receptacles arranged next to one another in the stacking direction between two biasing bodies which can be displaced relative to one another in a stacking direction and which can be displaced relative to one another in the stacking direction for receiving one pouch cell each, wherein the biasing bodies are designed and set up to be displaceable in the stacking direction between a loading state and a biasing state, wherein in the loading state a distance between the biasing bodies from one another in the stacking direction is greater than a sum of the thicknesses of the plurality of pouch cells to be accommodated in the cell receptacles in the stacking direction, and in the biasing state, in order to exert a biasing tension on the pouch cells accommodated in the cell receptacles, the biasing bodies are moved towards one another from their position in the assembly state, so that a length of the braced stack of pouch cells is smaller than an intended installation length of the stack of pouch cells in the state of the stack installed in the battery arrangement, the mounting device being designed and set up to be insertable transversely to the stacking direction in the preloaded state for inserting the clamped stack into a battery housing, and after inserting the stack by releasing the preload on the stack from the battery housing to be removable.

A “mounting device” is defined herein as a device that is used for and only during the assembly of an end product, without remaining in the end product after assembly has been completed, and is therefore removed again, in contrast to, for example, a clamping frame for pre-tensioning battery cells of a battery module in the battery module or a lattice support for holding and positioning battery cells in the battery module.

The assembly device can achieve the advantages and effects described with regard to the method in an analogous manner, so that their description is omitted here in order to avoid redundancies.

According to a preferred embodiment, an end plate receptacle for receiving an end plate can be arranged so that it can be moved relative to the plurality of cell receptacles between at least one biasing body and the plurality of cell receptacles, wherein the end plate receptacle is preferably arranged so as to be relatively displaceable to the adjacent pretensioning body or is arranged on the pretensioning body, which is preferred An end plate receptacle for receiving an end plate is arranged between the two prestressing bodies and the plurality of cell receptacles.

According to a preferred embodiment, at least one intermediate wall receptacle for receiving an intermediate wall that divides the plurality of pouch cells in the stacking direction can be arranged between the plurality of cell receptacles so as to be displaceable relative to the plurality of cell receptacles.

According to a preferred embodiment, the device can comprise at least one recess for at least one guide region provided on the clamped stack for guiding the clamped stack during insertion into the battery housing of the battery arrangement, preferably at least one recess being provided on an end plate receptacle and/or on an intermediate wall receptacle.

According to a preferred embodiment, the cell receptacles can have lateral openings, preferably slots, with respect to the stacking direction for receiving the contact tabs of the pouch cells, and/or the mounting device can have at least one positioning space for positioning a high-voltage contact and/or for positioning a sensor contact for cell voltage monitoring and/or temperature monitoring, preferably in the form of a foil contact, and/or at least one insulating foil.

According to a preferred embodiment, the mounting device can further comprise a positioning plate for positioning the pouch cells accommodated in the cell receptacles in a predetermined position relative to one another, the positioning plate being designed and set up after the pouch cells have been inserted into the cell receptacles and before bracing transversely to be brought into contact with the pouch cells in the stacking direction and removable again.

Short description of the characters

• 1 schematisch eine perspektivische Seitenansicht einer Montagevorrichtung Montieren eines Stapels von Pouch-Zellen in eine Batterieanordnung;
• 2 schematisch eine weitere perspektivische Seitenansicht der Montagevorrichtung aus 1;
• 3 schematisch eine weitere perspektivische Seitenansicht der Montagevorrichtung aus 1 in einem Bestückzustand;
• 4 schematisch eine weitere perspektivische Seitenansicht der Montagevorrichtung 1 aus 3 mit aufgesetzter Positionierplatte;
• 5 schematisch eine weitere perspektivische Seitenansicht der Montagevorrichtung aus 1 in einem Vorspannzustand;
• 6 schematisch eine weitere perspektivische Seitenansicht der Montagevorrichtung aus 1 im Vorspannzustand mit verbundenen Kontaktfahnen der in der Montagevorrichtung gehaltenen Pouch-Zellen;
• 7 schematisch eine weitere perspektivische Seitenansicht der Montagevorrichtung aus 6;
• 8 schematisch eine perspektivische Seitenansicht der Montagevorrichtung aus 7 und eines Batteriegehäuses der herzustellenden Batterieanordnung;
• 9 schematisch eine perspektivische Seitenansicht der Montagevorrichtung gemäß der 7 und 8 in einem in das Batteriegehäuse eingestecktem Zustand;
• 10 schematisch eine perspektivische Seitenansicht, in welcher die Montagevorrichtung aus ihrer Position gemäß 9 heraus wieder aus dem Batteriegehäuse entnommen wurde; und
• 11 schematisch die gemäß 10 entstandene Batterieanordnung.

Preferred further embodiments of the invention are explained in more detail by the following description of the figures. Show:

• 1 schematically a perspective side view of a mounting device mounting a stack of pouch cells into a battery assembly;
• 2 schematically another perspective side view of the mounting device 1 ;
• 3 schematically another perspective side view of the mounting device 1 in an assembled state;
• 4 schematically another perspective side view of the mounting device 1 3 with attached positioning plate;
• 5 schematically another perspective side view of the mounting device 1 in a bias state;
• 6 schematically another perspective side view of the mounting device 1 in the preloaded state with connected contact tabs of the pouch cells held in the mounting device;
• 7 schematically another perspective side view of the mounting device 6 ;
• 8th schematically a perspective side view of the assembly device 7 and a battery housing of the battery assembly to be produced;
• 9 schematically a perspective side view of the mounting device according to 7 and 8th in a state inserted into the battery case;
• 10 schematically a perspective side view, in which the mounting device from its position according to 9 was removed from the battery housing again; and
• 11 schematically the according 10 resulting battery arrangement.

Detailed description of preferred embodiments

Preferred exemplary embodiments are described below with reference to the figures. The same, similar or identical elements in the different figures are given identical reference numbers, and a repeated description of these elements is partly omitted in order to avoid redundancies.

In 1 is schematically shown a perspective side view of a mounting device 1 for mounting a stack of pouch cells, not shown here, in a battery arrangement. It comprises two prestressing bodies 2, which are arranged to be displaceable relative to one another in a stacking direction 3. It further comprises a plurality of cell receptacles 4, which are arranged next to one another or one behind the other in the stacking direction 3 and can be displaced relative to one another in the stacking direction 3, for each accommodating one pouch cell, with only two cell receptacles 4 being shown here for the sake of clarity. The cell receptacles 4 are arranged between the prestressing bodies 2.

The biasing bodies 2 each have an end plate receptacle 5 for receiving an end plate on the side facing the cell receptacles 4.

Furthermore, the mounting device 1 includes intermediate wall receptacles 6, only one of which is shown here for the sake of clarity. The intermediate wall receptacles 6 are each designed to accommodate an intermediate wall that divides the plurality of pouch cells in the stacking direction and are each arranged between the cell receptacles 4 so that they can be displaced relative to the cell receptacles 4 and the biasing bodies 2.

The prestressing bodies 2, correspondingly also their end plate receptacles 5, the cell receptacles 4 and the intermediate wall receptacles 6, are in the present case guided along a guide 7 in the stacking direction 3.

The biasing bodies 2 are designed and set up in the stacking direction 3 between a loading state (see 2 ) and a bias state (see 5 ) to be movable.

2 schematically shows another perspective side view of the mounting device 1 1 , whereby all shots 4, 5, 6 are shown here. The assembly device 1 is in the assembly state. The prestressing bodies 2 lie therein at a predetermined distance from one another in the stacking direction 2, which is greater than a sum of the thicknesses of the pouch cells (not shown) to be accommodated in the cell holders 4 in the stacking direction 3.

The cell receptacles 4 and partition wall receptacles 6 are arranged evenly distributed in the stacking direction 3. This makes it possible, as in 3 shown, which is a further perspective side view of the mounting device 1 1 shows inserting the pouch cells 8 to be accommodated, the partition walls 9 and the end plates 10 into the receptacles 4, 5, 6 provided for this purpose, without a force acting on the inserted parts in the stacking direction 3. As a result, the stack 12, comprising the pouch cells 8, partitions 9 and end plates 10 accommodated in the respective receptacles 4, 5, 6, has a predetermined length 11'.

In the preload state, which 5 can be seen, which is a further perspective side view of the mounting device 1 1 shows, the prestressing bodies 2 are moved towards each other from their position in the assembly state to exert a prestressing on the pouch cells 8, intermediate walls 9 and end plates 10 accommodated in the respective receptacles 4, 5, 6, so that a length 11 of the thereby clamped stack 12 of pouch cells 4 in the stacking direction 3 is smaller than a predetermined installation length of the stack 12 of pouch cells 4 in the state of the stack 12 installed in the battery arrangement.

The assembly device 1 is further designed and set up, in the preloaded state, for inserting the clamped stack 12 into a battery housing (see 8th until 11 , there reference number 13) to be insertable transversely to the stacking direction 3, and to be removable from the battery housing 13 after inserting the stack 12 by releasing the preload on the stack 12.

The assembly device 1 is therefore a device which is used for and only during the assembly of the battery arrangement 100 (see 11 ) is used without remaining in the battery arrangement 100 after assembly has been completed, and is therefore removed again, in contrast to, for example, a clamping frame for pre-tensioning battery cells of a battery module in the battery module or a lattice support for holding and positioning battery cells in the battery module.

How 3 To remove, the stack 12 includes for the purpose of insertion into the battery housing 13 guide areas 14 for guiding the clamped stack 12 during insertion into the battery housing 13 of the battery assembly 100, as with regard to 9 refer to. The guide areas 14 are in the present case designed as guide webs 17 extending transversely to the stacking direction 3 and transversely to the stack insertion direction 16, in which the stack 12 clamped in the assembly device 1 is inserted into the battery housing 13, which extend transversely to the stacking direction 2 through lateral recesses 15 the end plate receptacles 10 and the intermediate plate receptacles 9 extend.

As described below regarding a method of manufacturing the battery assembly 100 11 described, the guide webs 17 can be inserted transversely to the stacking direction 3 in the stack insertion direction 16 into guide sections 18 provided in the battery housing 13.

How 3 As can be seen, the cell receptacles 4 have lateral openings 19 with respect to the stacking direction 3, here in the form of slots, which are designed to receive the contact tabs 20 of the pouch cells 8. The mounting device 1 is designed in such a way that the contact tabs 20 are essentially freely accessible from the sides, so that they can be contacted with one another in a predetermined order.

The assembly device 1 includes, like 6 to be removed, as well as positioning spaces 21 for positioning one high-voltage contact 22.

As in 7 indicated, the mounting device 1 further comprises lateral positioning spaces 23, in which a contact film 24 with a plurality of sensor contacts 25 for cell voltage monitoring and / or temperature monitoring can be positioned and thereby connected in precise position to the contacted contact lugs.

Like that 3 until 7 As can be seen, the mounting device 1 further comprises a positioning plate 26 for positioning the pouch cells 8 accommodated in the cell receptacles 4, the intermediate walls 9 accommodated in the intermediate wall receptacles 5 and the end plates 10 received in the end plate receptacles 5 in a predetermined position relative to one another, the positioning plate 26 is designed and set up after inserting the pouch cells 8, the partition walls 9 and the end plates 10 into the respective receptacles 4, 5, 6 and before bracing transversely to the stacking direction 3 with the pouch cells 4, the partition walls 9 and to be able to be brought into contact with the end plates 10 and to be removable again.

A preferred embodiment of a method for producing a battery assembly is described below using the 1 until 11 using the mounting device 1 shown therein.

First of all, they are in the assembled state according to 2 arranged receptacles 4, 5, 6 of the mounting device 1 as in 3 indicated, equipped in an insertion direction 27 with the pouch cells 8, the intermediate walls 9 and the end plates 10.

Following this, the positioning plate 26 is optionally placed on the mounting device 1 in the insertion direction 27 and the mounting device 1 is then optionally rotated or overturned by 180° about the stacking direction 3. As a result, the pouch cells 4, partition walls 9 and end plates 10 rest on the positioning plate 26 due to gravity, as 4 refer to.

Now the pouch cells 8, intermediate walls 9 and end plates 10 are pretensioned with a predetermined pretension by moving the pretensioning bodies 2 closer to one another from their predetermined position in the assembly state, as in 5 shown. As described above, the stack 12 thereby has the length 11 of the stack of pouch cells braced thereby, which is smaller than an installation length of the stack 12 when the stack 12 is installed in the battery arrangement 100.

As in regards to the 5 and 6 As can be seen, after prestressing the stack 12, the contact tabs 20 of the plurality of pouch cells 8 protruding laterally from the pouch cells 8 in the stacking direction 3 are contacted, here via welding, the pouch cells 8 being electrically connected in series according to this embodiment become. In addition, a high-voltage contact 22 is connected to a contact lug 20 of one of the pouch cells 8.

How 7 indicated, a sensor contact 25 for cell voltage monitoring and/or temperature monitoring is now attached to the connected contact lugs 20 of each of the plurality of pouch cells 8 by welding a contact film 24 to the contact lugs 20.

The assembly device 1 is then pivoted back through 180° around the stacking direction 3 so that it is in the in 8th shown location. In all figures, the direction of gravity runs from top to bottom, i.e. in the direction of the reference number 16 in 8th marked arrow.

As in 8th indicated, the battery housing 13 is now placed on the mounting device 1, the guide areas 14, more precisely the webs 17, being guided in the guide sections 18 of the battery housing 13 until the mounting device 1 is inserted into the battery housing 13. Turning can now take place again, so that the assembly consisting of filled assembly device 1 and battery housing 13 as in 9 shown is available.

The prestress exerted on the clamped stack 12 by the prestressing bodies 2 is then released. As a result, the stack 12 expands in the stacking direction 3.

The guide sections 18 represent stops in the stacking direction 3 for the guide areas 14 of the stack 12. The expanded stack 12 is correspondingly prestressed in the housing with its predetermined installation length in the stacking direction 3 with a predetermined tension in the stacking direction 3.

The assembly device 1 can then be removed from the battery housing again.

Optionally, at least the pouch cells 4, preferably also the end plates 10 and/or the intermediate walls 9, are glued to the housing, in which case an expanding, at least partially hardening foam material casting compound (not shown here) is poured into the battery housing 13 .

To the extent applicable, all individual features shown in the exemplary embodiments can be combined and/or exchanged with one another without departing from the scope of the invention.

Reference symbol list

1

Mounting device

2

preload body

3

Stacking direction

4

Cell recording

5

End plate holder

6

Intermediate wall mount

7

guide

8th

Pouch cell

9

partition wall

10

End plate

11

Length of the braced stack 12 in the pre-tensioned state

11'

length

12

stack

13

Battery case

14

Leadership area

15

recess

16

Stack insertion direction

17

Guide bridge

18

Leadership section

19

opening

20

Contact flag

21

Positioning space

22

High voltage contact

23

Positioning space

24

Contact foil

25

Sensor contact

26

Positioning plate

27

Direction of insertion

100

Battery arrangement

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 3631877 A1 [0004]
• DE 102016118977 [0004]
• US 9225035 B1 [0004]

Claims (14)

Method for producing a battery assembly (100), comprising: - Providing a plurality of cell receptacles (4) arranged next to one another in the stacking direction (3) between two prestressing bodies (2) which can be displaced relative to one another in a stacking direction (3) and which can be displaced relative to one another in the stacking direction (3) for receiving one pouch cell (8) each. in an assembled state; - Inserting a plurality of pouch cells (8) into the cell holders (4); - Prestressing the pouch cells (8) with a predetermined prestressing by moving the prestressing bodies (2) closer to one another from their position in the assembly state, so that a length (11) of the thereby clamped stack (12) of pouch cells (8) becomes smaller is an installation length of the stack (12) of pouch cells (8) when the stack (12) is installed in the battery arrangement (100); - Inserting the stack (12) of pouch cells (4) held by the preload in the cell holders (4) into a battery housing (13) transversely to the stacking direction (3); - Releasing the prestress exerted by the prestressing bodies (2) on the clamped stack (12); and - Remove the assembly of cell holders (4) and preload bodies (2) from the battery housing (13). Procedure according to Claim 1 , characterized in that after prestressing the pouch cells (8) to form the braced stack (12) of pouch cells (4), the contact tabs (20) of the majority protruding laterally from the pouch cells (8) in the stacking direction (3). of pouch cells (8) are electrically contacted with one another, preferably via a permanent connection of at least two adjacent contact tabs (20), particularly preferably via welding, wherein preferably the pouch cells (8) are electrically connected in series, and / or that at least one High-voltage contact (23) is connected to a contact lug (20) of one of the pouch cells (8). Method according to one of the preceding claims, characterized in that a sensor contact (24) for cell voltage monitoring and/or temperature monitoring, preferably in the form of a foil contact, is attached to at least one contact tab (20) of the plurality of pouch cells (8), and/ or at least on a lateral side of the stack (12) of pouch cells (8) relative to the stacking direction (3), preferably via at least one contact tab (20) of the plurality of pouch cells (8), an insulating film is applied. Method according to one of the preceding claims, characterized in that before the prestressing is applied by the prestressing bodies (2) between at least one prestressing body (2) and the plurality of pouch cells (8), an end plate (10) is inserted into one of the plurality of Cell receptacles (4) relatively displaceable end plate receptacle (5) is used, with an end plate (10) preferably being inserted between the two biasing bodies (2) and the plurality of pouch cells (8). Method according to one of the preceding claims, characterized in that before the prestressing is applied by the prestressing bodies (3), at least one intermediate wall (9) dividing the plurality of pouch cells (8) in the stacking direction (3) between the plurality of pouch cells (8) is inserted into an intermediate wall receptacle (6) which is relatively displaceable to the plurality of cell receptacles (4). Method according to one of the preceding claims, characterized in that the insertion of the pre-stressed stack (12) into the battery housing (13) is carried out in a guided manner, the clamped stack (12) preferably having at least one guide region (14) which is inserted into a corresponding guide section ( 18) can be inserted into the battery housing (13), preferably at least one end plate (10) and/or at least one intermediate wall (9) in the braced stack (12) having at least one guide region (14). Method according to one of the preceding claims, characterized in that the pouch cells (8) are glued to the battery housing (13), preferably an adhesive, preferably a thermally conductive adhesive, being used before, during and/or after insertion of the clamped stack (12 ) is applied to the battery housing (13) and/or to at least one side of the braced stack (12), and/or the pouch cells (8) with a casting compound, preferably an expanding, at least partially hardening foam material, at least partially with the Battery housing (13) are cast, the casting compound preferably being an expanding and / or heat-conducting and / or electrically insulating casting compound. Method according to one of the preceding claims, characterized in that after inserting the pouch cells (8) into the cell holders (4) and before clamping, a positioning plate (26) transverse to the stacking direction (3) with the pouch cells (8) is brought into contact in order to bring the pouch cells (8) into a predetermined position relative to one another. Mounting device (1) for mounting a stack (12) of pouch cells (8) in a battery arrangement (100), comprising a plurality of biasing bodies (2) which can be displaced relative to one another in a stacking direction (3) next to one another in the stacking direction (3). arranged cell receptacles (4) which can be displaced relative to one another in the stacking direction (3) for accommodating one pouch cell (8); wherein the biasing bodies (2) are designed and set up to be displaceable in the stacking direction (3) between a loading state and a biasing state, wherein in the loading state a distance (11`) of the biasing bodies (2) from one another in the stacking direction (3) is greater than one Sum of the thicknesses of the plurality of pouch cells (8) to be accommodated in the stacking direction (3), and in the prestressing state to exert a prestress on the pouch cells (8) accommodated in the cell receptacles (4), the prestressing bodies (2) from their position in Assembly state are moved towards each other, so that a length (11) of the clamped stack (12) of pouch cells (8) is smaller than an installation length of the stack (12) of pouch cells (8) in the battery arrangement (100) installed state of the stack (12); wherein the mounting device (1) is designed and set up to be insertable transversely to the stacking direction (3) in the preloaded state for inserting the clamped stack (12) into a battery housing (13), and after inserting the stack (12) by releasing the preload to be removable from the battery housing (13) on the stack (12). Mounting device (1) according to the preceding claim, characterized in that between at least one biasing body (2) and the plurality of cell receptacles (4) there is an end plate receptacle (5) for receiving an end plate (10) which is relatively displaceable to the plurality of cell receptacles (4). is arranged, wherein the end plate receptacle (5) is preferably arranged so that it can be displaced relative to the adjacent prestressing body (2) or is arranged on the prestressing body (2), with an end plate receptacle (2) preferably between the two prestressing bodies (2) and the plurality of cell receptacles (4). 5) is arranged to accommodate an end plate (10). Mounting device (1) according to one of the two preceding claims, characterized in that at least one intermediate wall receptacle (6) for receiving an intermediate wall (9) which divides the plurality of pouch cells (8) in the stacking direction (3) between the plurality of cell receptacles (4 ) is arranged so as to be displaceable relative to the plurality of cell receptacles (4). Mounting device (1) according to one of Claims 9 until 11 , characterized in that the mounting device (1) has at least one recess (15) for at least one guide region (14) provided on the clamped stack (12) for guiding the clamped stack (12) during insertion into a battery housing (13) of the battery arrangement ( 100), wherein at least one recess (15) is provided on an end plate receptacle (5) and/or on an intermediate wall receptacle (6). Mounting device (1) according to one of Claims 9 until 12 , characterized in that the cell receptacles (4) have lateral openings (19), preferably slots, with respect to the stacking direction (3) for receiving the contact tabs (20) of the pouch cells (8), and / or the assembly device (1 ) at least one positioning space (21, 23) for positioning a high-voltage contact (22) and / or for positioning a sensor contact (24) for cell voltage monitoring and / or temperature monitoring, preferably in the form of a film contact, and / or at least one insulating film. Mounting device (1) according to one of Claims 9 until 13 , further comprising a positioning plate (26) for positioning the pouch cells (12) accommodated in the cell receptacles (4) in a predetermined position relative to one another, the positioning plate (26) being designed and set up after the pouch cells (8 ) into the cell receptacles (4) and to be brought into contact with the pouch cells (8) transversely to the stacking direction (3) before bracing.

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