CN113013465A - Method for producing a power cell for a motor vehicle and corresponding production device - Google Patents

Method for producing a power cell for a motor vehicle and corresponding production device Download PDF

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Publication number
CN113013465A
CN113013465A CN202011493612.0A CN202011493612A CN113013465A CN 113013465 A CN113013465 A CN 113013465A CN 202011493612 A CN202011493612 A CN 202011493612A CN 113013465 A CN113013465 A CN 113013465A
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CN
China
Prior art keywords
cell
battery housing
module
receiving compartment
base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011493612.0A
Other languages
Chinese (zh)
Inventor
M·格曼斯
T·本克尔
R·海德
O·席勒尔
M·维弥
M·舒斯勒
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Audi AG
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Audi AG
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Filing date
Publication date
Application filed by Audi AG filed Critical Audi AG
Publication of CN113013465A publication Critical patent/CN113013465A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention relates to a method for producing a power cell (2) for a motor vehicle, wherein a cell housing (3) of the power cell (2) has a receiving compartment (4) for receiving a cell module (5). It is proposed that a thermally conductive agent (14) is initially applied to a base (6) delimiting the receiving compartment (4) and the battery housing (3) is arranged on a mating holder (15) supporting the base (6), and that the individual modules (5) are subsequently pressed against the thermally conductive agent (14) by means of a placement device (10) during insertion of the individual modules (5) into the receiving compartment (4), wherein the pressing force acting on the placement device (10) is adjusted, wherein after the pressing, a decompression process of the thermally conductive agent (14) is carried out, before the individual modules (5) are fixed to the battery housing (3) and the battery housing (3) is removed from the mating holder (15). The invention also relates to a production device (1) for producing a power cell (2) for a motor vehicle.

Description

Method for producing a power cell for a motor vehicle and corresponding production device
Technical Field
The invention relates to a method for producing a power cell for a motor vehicle, wherein a cell housing of the power cell has a receiving compartment for receiving a cell module. The invention also relates to a manufacturing device for manufacturing the power battery of the motor vehicle.
Background
Known from the prior art is, for example, the document DE 102017128529 a 1. This document describes a motor vehicle battery, i.e. a power battery of a motor vehicle, having: a battery housing having a housing interior partially bounded by a housing frame and a housing bottom; a plurality of battery modules disposed in the housing interior cavity; and at least one first cooling channel formed in the region of the housing bottom for cooling the battery module from the first side. The housing interior is delimited on the side opposite the housing bottom by the housing top or by the housing cover, wherein in the region of the housing top or the housing cover the at least one second cooling channel is designed for cooling the battery module from the second side.
Furthermore, document DE 10320186 a1 discloses a thermally conductive paste for thermally coupling a power semiconductor component to a heat sink. The thermally conductive paste is composed of a base material and at least one filler material. Each component has the following characteristics: the base material has a dynamic viscosity of between 25mPa s and 500mPa s, the at least one filler material consists of metal particles, the metal particles or the filler material has a particle size of less than 20 μm, and the thermally conductive paste has a filler material filling degree of between 20% and 70%. The specific resistance of the thermal paste thus formed was less than 100 Ω m, and the thermal resistance was 3.4W/(K · m).
Disclosure of Invention
The object of the present invention is to provide a method for producing a power cell for a motor vehicle, which has advantages over known methods, in particular a quick and reliable assembly of the cell modules in the receiving compartment.
According to the invention, this object is achieved by a method for producing a power cell for a motor vehicle having the features of claim 1. It is proposed that a heat-conducting agent/medium is initially applied to the base delimiting the receiving compartment and the battery housing is arranged on the mating holder of the support base, and that the monomer module is subsequently pressed against the heat-conducting agent by means of a positioning device when the monomer module is inserted into the receiving compartment, wherein the pressing force acting on the positioning device is adjusted, wherein after the pressing, a decompression of the heat-conducting agent takes place, and that the monomer module is subsequently fixed on the battery housing and the battery housing is removed from the mating holder.
The method is used to produce a power cell which is preferably installed as a component of a motor vehicle, but can also be present separately from the motor vehicle. The power cells are used for temporarily storing electrical energy, in particular for operating a drive or a drive train of the motor vehicle. The electrical energy stored in the power cells is used in this case to provide a drive torque intended to drive the motor vehicle by means of the drive or drive train.
The power battery has a battery housing and at least one cell module. A receiving compartment is formed in the battery housing, which receiving compartment is provided and designed for receiving a cell module. The receiving compartment is defined by the bottom and walls of the battery housing. For example, bearing surfaces are formed on the walls, which extend in particular parallel to the base. The support surface may be used to support or secure the monomer modules after they are arranged in the receiving compartment. For example, the support surface is arranged such that the cell module, after it has been arranged in the receiving compartment, is spaced apart from the bottom of the battery housing, while the cell module itself rests on the support surface. In this way, tolerances in the dimensions of the cell modules and the battery housing can be reliably compensated. It can be provided that the individual modules are supported directly on the support surface. However, it can also be provided that a tolerance compensation element is arranged between the cell module and the bearing surface, by means of which tolerance compensation element manufacturing tolerances of the cell module and/or the battery housing can be compensated.
The single module is used for temporarily storing electric energy; for this purpose, the cell module has at least one battery cell, preferably a plurality of battery cells electrically connected to one another. Preferably, instead of only one single cell module being arranged in the battery housing, a plurality of cell modules are present in the battery housing. In this embodiment, the battery housing also has a plurality of receiving compartments and a cell module, wherein each of the receiving compartments is delimited by the bottom of the battery housing. Furthermore, the receiving compartments are separated from each other by a wall of the battery housing. That is, one of the walls of the battery housing is present between each two of the receiving compartments. In the production of a power cell, it is preferable not only to arrange the individual modules in the receiving compartment, but also to electrically connect the individual modules.
The contact surface, if present, is provided, for example, on a fastening element which projects from at least one wall or a plurality of walls of the battery housing. The fastening element is preferably connected to the at least one wall or the wall sections in a material-locking manner, for example by gluing or welding. The individual modules can have mating bearing surfaces which, after the arrangement of the individual modules in the receiving compartment, bear against the bearing surfaces, in particular flat or planar, so that the individual modules are supported in the receiving compartment at a distance from the base. The individual modules are not in contact with the base in this case and are at most indirectly connected to the base, i.e. via a thermally conductive agent.
Alternatively, it can be provided as explained that the individual modules do not rest directly on the bearing surface, but are supported on the bearing surface by means of tolerance compensation elements. For example, each of the bearing surfaces is provided with such tolerance compensation elements. In this case, each of the plurality of tolerance compensation elements bears on one side against the respective bearing surface and on the other side against the respective mating bearing surface of the individual module, so that the individual module is supported on the bearing surface by the tolerance compensation element or elements. The tolerance compensation element can adjust a defined distance between the bearing surface and the mating bearing surface.
For example, it is proposed that the individual modules are arranged in the receiving compartment in such a way that at least one of the mating bearing surfaces is arranged at a distance from the corresponding bearing surface. It is of course also possible to space a plurality or all of the mating bearing surfaces from the corresponding bearing surfaces. The tolerance compensation element or the tolerance compensation elements are then adjusted in such a way that the tolerance compensation elements bear against the bearing surface and the mating bearing surface, respectively, so that the cell module is securely supported in the battery housing.
During operation of the power cells, in particular during charging or discharging of the power cells, heat is generated on or in the cell modules, and this heat must be dissipated at least occasionally in order to prevent excessive temperatures of the cell modules. For this purpose, the battery housing is preferably cooled passively or actively. In the case of passive cooling, at least one cooling body is arranged on the battery housing or the battery housing itself is designed locally as a cooling body. In the context of active cooling, it can be provided that the battery housing has at least one coolant channel through which a coolant flows at least occasionally during operation of the power cell.
In order to cool the cell modules effectively, it is necessary to establish a thermal connection between the cell modules and the battery housing. For this purpose, during the production of the power cell, the heat-conducting agent is introduced into the receiving compartment, i.e. applied to the base. Subsequently, the individual modules are inserted into the receiving compartments, so that they are supported on the one hand on the support surface and on the other hand lie against the heat-conducting agent. The thermally conductive agent thus bears on the one hand against the cell module and on the other hand against the battery housing and thermally connects the cell module and the battery housing to one another.
As the heat transfer agent, for example, a multi-component heat transfer agent is used, which in this case comprises at least a first component and a second component. The first component is, for example, a carrier material and the second component is, for example, a filler material, wherein the thermal conductivity of the thermal conductor is achieved primarily by means of the filler material. For this purpose, the filler material preferably has a higher thermal conductivity than the carrier material. The heat-conducting agent is generally present in the form of a liquid or paste. A paste is understood to be a solid-liquid mixture in which, for example, the first component is present as a liquid and the second component is present as a solid. For example, the second component comprises or is formed from metal particles. Particularly preferably, the proportion of the second component in the thermally conductive agent is at least 50%, at least 60%, at least 70% or at least 80%. A particularly good heat conduction is thereby achieved by means of the heat-conducting agent.
The amount of the thermal conductive agent to be applied on the bottom may be determined according to the interval between the bottom and the monomer module and the area of the bottom. This distance is usually determined in accordance with the maximum gap between the individual modules and the base, which is determined by means of a tolerance chain analysis. The object is to sufficiently and reliably wet the thermally active surfaces and to reliably fill the gaps after the insertion and fixing of the individual modules in the receiving compartments has been completed. However, the actual distance between the base and the individual modules is unknown. If the amount of thermally conductive agent is calculated from the maximum gap, an unnecessarily large amount of thermally conductive agent is typically introduced into the receiving compartment.
In order to reduce the amount of heat-conducting agent required, it is desirable to increase the contact pressure, i.e., to press the individual modules more strongly against the heat-conducting agent by means of a positioning device, in order to achieve a uniform distribution of the heat-conducting agent between the individual modules and the bottom of the receiving compartment even when the layer of heat-conducting agent is thin. However, such an increase in the pressing force may lead to mechanical damage of the individual modules. This is due in particular to the fact that the cell modules and the battery housing are manufactured with relatively large dimensional tolerances, while the thermally conductive agent serves to compensate for the manufacturing tolerances. In this way, it is possible for an inadmissibly strong force to act on the cell module in the region of the cell module below which the thermally conductive agent layer is thinner than in the other regions.
For example, it can be provided that the contact pressure acting on the placement device is measured and reduced if the contact pressure exceeds a threshold value.
The cell housing is arranged on the mating holder before the single-body module is pressed against the heat-conducting agent or the base. The mating holder is used to support the base during insertion of the single module into the receiving compartment so as to prevent deformation of the base caused by compression. The mating holder may be designed to be flexible, so that the mating holder allows a certain compensation movement. The mating holder is designed such that the compensating movement takes place only within the range of a tolerance compensation, by means of which the production tolerances, in particular the shape tolerances, of the base are compensated.
It is generally provided that the cell modules are inserted into the receiving compartment, pressed against the heat-conducting agent, and subsequently fixed to the battery housing, for example screwed to the battery housing. Immediately after the fixing, the battery case is removed from the mating holder. Due to the already proposed increase in the contact pressure, it may happen that the base deforms during or after the removal of the battery housing from the mating holder, since the heat-conducting agent is not yet sufficiently distributed.
For this reason, it is provided that the decompression of the heat conducting agent is carried out before the individual module is fixed to the battery case and mainly before the battery case is removed from the mating holder. During the depressurization process, depressurization of the thermally conductive agent can occur, in particular the thermally conductive agent is distributed between the monomer module and the bottom. During the decompression process, it is preferred that the area of the bottom on which the thermally conductive agent is present increases. During the decompression process, the battery casing remains on the mating holder, i.e. continues to rest against it, so that the bottom is supported by the mating holder. Additionally, the cell modules continue to be held by means of the placement device. The placement device is not removed from the monomer module. The heat-conducting agent is distributed particularly effectively between the base and the monomer module by means of a decompression process. Damage to the battery housing, in particular the deformation of the base, is thus reliably avoided.
In a development of the invention, the decompression process is carried out by stopping the installation and/or by reducing the contact pressure. It can also be provided that the placement device is moved together with the individual modules into a defined position in which the individual modules are pressed with a pressing force against the heat-conducting agent. After this position is reached, the placement device is stopped, i.e. the position of the placement device is fixed. This stop is continued for a defined period of time, in particular until the thermally conductive agent is distributed between the monomer module and the bottom. This takes place with a subsequent flow of the heat-conducting agent due to the at least partially further acting pressing force. The single module is then secured to the battery housing and the battery housing is removed from the mating holder. The placement device is additionally removed from the monoblock module.
Additionally or alternatively, a reduction of the pressing force is proposed. The contact pressure is selected to be low during the decompression process on the basis of the contact pressure which exists when the monomer module is pressed against the heat-conducting agent. Particularly preferably, the pressing force is at most 50%, at most 25% or at most 10% of the pressing force acting during pressing. It can also be provided that the contact pressure is reduced to 0, so that the placement device is allowed to move freely with the individual modules. The reduced pressing force is used until the thermal conductor is distributed between the monomer module and the bottom. For example, for this purpose, a certain period of time is awaited.
The cell module is then secured to the battery housing, the battery housing is removed from the mating holder, and the placement device is removed from the cell module. The method in this way achieves a particularly high process reliability in the production of power cells, since deformations or damage to the base are reliably avoided.
In a further development of the invention, a fastening element for fastening the cell module is formed on a wall of the battery housing delimiting the receiving compartment, wherein the cell module is inserted into the receiving compartment in such a way that: such that, after insertion, the cell module is arranged at a distance from the fastening element, in particular is connected to the fastening element only indirectly by means of a tolerance compensation element, and/or the spacing between the cell module and the fastening element increases during decompression. This design has been described.
The fastening elements are ultimately used to support the individual modules. For example, the bearing surfaces already described are provided on the fastening element. The fastening element is preferably connected to the wall in a material-locking manner, in particular by means of gluing or welding. The fastening elements serve to hold the individual modules in the receiving compartments. For this purpose, for example, the individual modules are positively connected, in particular screwed, to the fastening elements. In the connection of the single-body module with the fastening element, tolerance-compensating elements can be provided. For example, one of a plurality of such tolerance compensation elements is arranged between each of the fastening elements and the single-piece module. This enables a reliable compensation of manufacturing tolerances of the cell module and the battery housing.
The monomer module is inserted into the receiving compartment in the following manner, namely: such that the individual modules are arranged spaced apart from the fastening elements after insertion. In particular, at the beginning of the decompression process, the individual modules are spaced apart from the fastening elements. The connection between the fastening element and the cell module is preferably established by means of a tolerance compensation element during the fixing of the cell module on the battery housing.
In addition or alternatively, it can be provided that the spacing between the individual modules and the fastening elements is increased during the decompression process. This is particularly true if the compaction force is reduced during decompression. It is therefore acceptable that the monomer modules are pushed away from the bottom due to the elastic action of the thermal conductor. Only then is the cell module fixed to the battery housing, i.e. in particular by adjusting the tolerance compensation element to an increased distance between the cell module and the fastening element. Also, a particularly process-reliable manufacture of the power cell is achieved, since the bottom is reliably prevented from deforming.
A development of the invention provides that the pressing force is generated by means of an actuator which is connected to the setting device via a push rod. The pressing force acting on the setting device is set on the actuator, which then exerts the pressing force on the setting device, i.e. via the push rod. The actuator is preferably connected to the placement device only by a push rod. In addition, the actuator is preferably the only actuator coupled to the placement device. In this respect, the pressing force acting on the positioning device is preferably provided purely by means of an actuator. Thereby achieving a simple structure of the manufacturing apparatus.
One development of the invention provides that the setting device has at least one base element connected to the push rod and acts on the individual modules via at least one retaining element coupled to the base element. The placement device is thus multi-piece and has a base element and at least one holding element. The base element is only indirectly connected with the single-piece module via the at least one retaining element. In contrast, the at least one holding element is only indirectly connected to the push rod via the base element. The holding element serves to hold the individual modules during their insertion into the receiving compartment. In particular, the pressing force acting on the positioning device is introduced into the individual modules by means of holding elements. This achieves a uniform distribution of the contact pressure on the individual modules.
For example, retaining rails are used as retaining elements which extend over at least 50%, at least 75% or at least 90% of the longitudinal sides of the individual modules. The holding element is provided as a holding rail, which is characterized by a cuboid shape, for example. The retaining rail extends over a large part of the longitudinal side of the single-block module. The longitudinal side is to be understood as the side of the individual module having the greatest extent, in particular in plan view or viewed in the direction of the placement device. This configuration of the retaining rail makes it possible to apply the pressing force to the individual modules particularly uniformly.
In a development of the invention, the force acting between the placement device and the cell module is detected when the placement device is stopped, and the decompression process is only terminated when this force falls below a threshold value. That is to say, if the setting device is stopped during the decompression process, the forces acting between the setting device and the cell module are detected during the decompression process, in particular measured by means of a corresponding sensor. The force will be reduced during the depressurization process due to the distribution of the thermally conductive agent between the monomer module and the bottom.
Once the force is below the threshold, it is assumed that the thermal conductor has been adequately distributed. The decompression process is correspondingly terminated, i.e. the cell module is fixed to the battery housing and the battery housing is removed from the mating holder. The threshold value is selected, for example, as a function of the pressing force acting during pressing. For example, the threshold value is a maximum of 50%, a maximum of 25%, or a maximum of 10% of the compressive force. The described process can achieve a high degree of process reliability when manufacturing power cells.
A further development of the invention provides that, when the contact pressure is reduced, the setting device is switched to no force action and that the decompression process is terminated only after the setting device has remained fixed for a defined period of time. As already explained above, the pressing force is reduced to 0 and the setting device is switched to be without force action, i.e. the setting device is released for displacement. The position of the placement device is then determined, in particular measured. As long as the placement device remains in place for a determined period of time, it can be assumed that the heat-conducting agent has been sufficiently distributed between the monomer module and the bottom. Accordingly, the depressurization process is also ended and the other steps of the method are performed. This process also enables higher process reliability.
In a further development of the invention, it is provided that the cell module is fixed to the battery housing by means of a tolerance compensation element after the decompression process. The distance between the fastening element and the cell module is compensated, for example, by means of a tolerance compensation element, i.e., after compensation, the tolerance compensation element bears on the one hand against the fastening element and on the other hand against the cell module, so that the cell module is supported on the battery housing by the tolerance compensation element. This enables a fast and flexible production of the power cell.
A further development of the invention provides that the fastening takes place by means of a screw connection. For example, the individual modules are screwed to tolerance compensation elements, which are in turn fastened to the battery housing, in particular to the fastening elements. However, it is also possible to provide that the cell module is screwed to the battery housing. In this case, for example, tolerance compensation elements are arranged between the fastening element and the single-piece module and are penetrated, for example, by screws for a screw connection.
The invention also relates to a production device for producing a power battery for a motor vehicle, in particular for carrying out the method according to an embodiment within the scope of the present description, wherein a battery housing of the power battery has a receiving compartment for receiving a cell module. It is proposed that the production device be provided and designed to initially apply a thermally conductive agent to the base delimiting the receiving compartment and to arrange the battery housing on a mating holder supporting the base, and subsequently to press the individual modules against the thermally conductive agent with the aid of a placement device when the individual modules are inserted into the receiving compartment, wherein the pressing force acting on the placement device is adjusted, wherein after the pressing, a decompression of the thermally conductive agent is carried out, and only then is the individual modules fixed to the battery housing and the battery housing removed from the mating holder.
The advantages of this embodiment of the manufacturing device or of the method have already been pointed out. The production device and the method for operating the production device can be modified according to embodiments within the scope of the present description, so that reference is made to these embodiments in this respect.
Drawings
The invention is explained in more detail below with reference to embodiments shown in the drawings, without limiting the invention. The sole figure here shows:
fig. 1 shows a schematic view of the regions of a manufacturing apparatus for manufacturing a power cell and the regions of the power cell.
Detailed Description
Fig. 1 shows a schematic view of a manufacturing apparatus 1 for manufacturing a power cell 2 and a part of this power cell 2. In the power battery 2, a battery housing 3 with a receiving compartment 4 for receiving a cell module 5 is shown, and also the cell module 5 is shown. The receiving compartment 4 is delimited by a bottom 6 and a wall 7 of the battery housing 3. A fastening element 8, on which a tolerance compensation element 9 is arranged, is fixed on the wall 7. The individual modules 5 can be fixed to the fastening element 8 by means of tolerance compensation elements 9. The height of the tolerance compensation element 9 can preferably be adjusted.
The individual modules 5 are inserted into the receiving compartments 4 by means of the placement device 10. The placement device has a base element 11 which is connected to a holding element 12, in the embodiment shown here to a plurality of holding elements 12. As long as the holding element 12 is mentioned within the scope of the present description, this embodiment can always be transferred to each of a plurality of holding elements 12. The base element 11 acts on the cell module 5 via the retaining element 12. The base element 11 is also coupled with an actuator, for example by means of a push rod 13. By means of the actuator, a contact pressure can be exerted on the base element 11 via the push rod 13, which contact pressure is introduced into the individual modules 5 via the holding element 12.
By means of the placement device 10, on the one hand, the individual modules 5 can be inserted into the receiving pockets and, on the other hand, can be pressed against a thermally conductive agent 14, which is arranged between the base 6 and the individual modules 5. As the heat-conducting agent 14, a multi-component heat-conducting agent is preferably used, which in this case comprises at least a first component and a second component. The first component is, for example, a carrier material and the second component is, for example, a filler material, wherein the thermal conductivity of the thermal conductor 14 is achieved primarily by means of the filler material. For this purpose, the filler material has a higher thermal conductivity than the carrier material. The thermally conductive agent 14 is generally present in the form of a liquid or paste. A paste is understood to be a solid-liquid mixture in which, for example, the first component is present as a liquid and the second component is present as a solid. For example, the second component comprises or is formed from metal particles. Particularly preferably, the second component makes up at least 50%, at least 60%, at least 70%, or at least 80% of the thermally conductive agent 14. A particularly good heat conduction is thereby achieved by means of the heat-conducting agent 14.
During the introduction of the cell modules 5 into the receiving compartment 4 or the pressing of the cell modules 5 against the heat-conducting agent 14, the battery housing 3 is arranged on a mating holder 15, by means of which the base 6 is supported. The mating holder 15 is preferably provided as a flexible mating holder. For this purpose, the mating holder has, for example, a plurality of support elements 16, which are arranged or fastened, in particular elastically, on a base body 17. In order to compensate for manufacturing tolerances, in particular shape tolerances, of the base 6, the co-operating holder 15, for example, effects a local displacement of the base 6 in a direction away from the placement device 10. Of course, the mating holder 15 can alternatively also be designed to be rigid.
In order to also be able to produce the power cells 2 with a high contact pressure acting on the placement device 10 and thus on the cell modules 5 in a reliable manner, it is proposed that after the contact pressure and before the cell modules 5 are fixed to the battery housing 3 and the mating holders 15 are removed from the battery housing 3, a decompression process of the heat-conducting agent 14 is carried out. For this purpose, the placement device 10 is stopped and waits for a certain period of time, for example. This enables a reliable distribution of the thermally conductive agent 14 between the bottom 6 and the monomer module 5. Alternatively, it can be provided that the decompression process is effected by reducing the pressing force, particularly preferably by switching the setting device 10 to apply no force. In this case, the thermally conductive agent 14 can press the cell module 5 in the direction of the installation device 10, so that the distance between the cell module 5 and the base 6 increases. Only then is the fixing of the cell module 5 to the battery housing 3 preferably effected by means of the tolerance compensation element 9. In the described manner and method, the assembly of the cell modules 5 in the receiving compartment 4 can be carried out using very high contact pressures without damage to the battery housing 3, in particular to the base 6.
List of reference numerals:
1 manufacturing apparatus
2 power battery
3 Battery case
4 receiving grid
5 monomer module
6 bottom
7 wall
8 fastening element
9 tolerance compensating element
10 positioning device
11 base element
12 holding element
13 push rod
14 Heat conducting agent
15 mating retainer
16 support element
17 base body

Claims (10)

1. A method for producing a power cell (2) for a motor vehicle, wherein a cell housing (3) of the power cell (2) has a receiving compartment (4) for receiving a cell module (5),
it is characterized in that the preparation method is characterized in that,
firstly, a thermally conductive agent (14) is applied to a base (6) delimiting the receiving compartment (4), and the battery housing (3) is arranged on a mating holder (15) supporting the base (6), and then the single module is pressed against the thermally conductive agent (14) by means of a placement device (10) when the single module (5) is inserted into the receiving compartment (4), wherein the pressing force acting on the placement device (10) is adjusted, wherein after the pressing, a decompression process of the thermally conductive agent (14) is carried out, before the single module (5) is fixed to the battery housing (3) and the battery housing (3) is removed from the mating holder (15).
2. Method according to claim 1, characterized in that the decompression process is carried out by stopping the setting device (10) and/or by reducing the pressing force.
3. Method according to one of the preceding claims, characterized in that fastening elements (8) for fixing the cell modules (5) are formed on a wall (7) of the battery housing (3) delimiting the receiving compartment (4), wherein the cell modules (5) are inserted into the receiving compartment (4) in such a way that: such that the cell module (5) is arranged spaced apart from the fastening element (8) after insertion and/or the spacing between the cell module (5) and the fastening element (8) is increased during the decompression process.
4. Method according to any of the preceding claims, characterized in that the pressing force is generated by means of an actuator connected to the setting device (10) by means of a push rod (13).
5. Method according to any one of the preceding claims, characterized in that the placement device (10) has at least one base element (11) connected with the push rod (13) and acts on the monomer module (5) by means of at least one retaining element (12) coupled with the base element (11).
6. The method according to one of the preceding claims, characterized in that a force acting between the placement device (10) and the cell module (5) is detected when the placement device (10) is standing still, and the depressurization process is terminated only when this force is below a threshold value.
7. Method according to any of the preceding claims, characterized in that when the pressing force is reduced, the setting device (10) is switched to be without force action, and the decompression process is terminated when the setting device (10) remains stationary over a determined period of time.
8. Method according to one of the preceding claims, characterized in that after the decompression process the cell modules (5) are fixed on the cell housing (3) by means of tolerance compensation elements (9).
9. Method according to any of the preceding claims, wherein the fixation is achieved by a threaded connection.
10. A manufacturing device (1) for manufacturing a power cell (2) of a motor vehicle, in particular for carrying out a method according to one or more of the preceding claims, wherein a cell housing (3) of the power cell (2) has a receiving compartment (4) for receiving a cell module (5),
it is characterized in that the preparation method is characterized in that,
the production device (1) is designed to firstly apply a heat-conducting agent (14) to a base (6) delimiting a receiving compartment (4), to arrange the battery housing (3) on a mating holder (15) supporting the base (6), and to subsequently press the monomer module (5) against the heat-conducting agent (14) by means of a positioning device (10) when the monomer module is inserted into the receiving compartment (4), wherein the pressing force acting on the positioning device (10) is adjusted, wherein after the pressing, a decompression process of the heat-conducting agent (14) is carried out, before the monomer module (5) is fixed to the battery housing (3) and the battery housing (3) is removed from the mating holder (15).
CN202011493612.0A 2019-12-20 2020-12-17 Method for producing a power cell for a motor vehicle and corresponding production device Pending CN113013465A (en)

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DE102019135400.5A DE102019135400A1 (en) 2019-12-20 2019-12-20 Method for manufacturing a traction battery of a motor vehicle and a corresponding manufacturing device

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