DE102022209210A1 - Method for producing a battery system - Google Patents

Abstract

The invention relates to a method (22) for producing a battery system (8), which has a housing (10) with a first housing part (12) and a second housing part (14), with a plurality of battery cells (20) in the housing (10). are arranged. A metal part (26) provided with a coating (28) is used as the first housing part (12). Several recesses (36) are pressed into the first housing part (12) in such a way that a bulge (38) is created adjacent to them. The first housing part (12) is attached to the second housing part (14), with the bulges (38) resting on the second housing part (14). The invention further relates to a battery system (8).

Description

The invention relates to a method for producing a battery system and a battery system. The battery system has a housing with a first housing part and a second housing part, with a plurality of battery cells being arranged in the housing.

Increasingly, motor vehicles are at least partially driven by an electric motor, so that they are designed as electric vehicles or hybrid vehicles. A high-voltage battery, which includes several individual battery modules, is usually used to power the electric motor. The battery modules are usually identical to one another and are connected electrically in series and/or parallel, so that the electrical voltage applied to the high-voltage battery corresponds to a multiple of the electrical voltage provided by each of the battery modules. Each battery module in turn comprises several battery cells, which are usually arranged in a common module housing and which are electrically connected to one another in series and/or parallel.

The high-voltage battery usually has a structure to stabilize the battery modules relative to one another. The structure is designed in the manner of a frame, by means of which the battery modules are surrounded on the circumference. To ensure that the battery modules are also protected against foreign particles, the frame, which is designed in the manner of a hollow cylinder, is closed at the end by means of a shell-like cover. For reasons of weight, the two shells are made from a comparatively thin sheet of metal. An alternative involves using a cast structure or deep-drawn sheet metal instead of the frame.

During operation, it is possible that moisture can enter and lead to corrosion of one of the battery cells and/or one of the battery modules. It is possible that the electrolyte leaks and/or other further damage occurs, so that the respective battery cell or battery module is defective. To avoid this, it is necessary to provide at least one of the two shells with a coating.

When operating the motor vehicle, it is possible that electromagnetic fields arise, which can lead to a malfunction of the battery module arranged in the housing. To avoid this, it is necessary to shield the battery modules. For this purpose, for example, the complete high-voltage battery can be surrounded by a shielding film that is electrically contacted with ground. However, this leads to increased material costs and an extended manufacturing time. It is also necessary to provide additional space. Alternatively, one of the shells is used for shielding, which is electrically contacted with ground. For this it is necessary to remove the coating locally and make the electrical contact there. This leads to additional work steps, which extends manufacturing time and increases manufacturing costs.

The invention is based on the object of specifying a particularly suitable method for producing a battery system and a particularly suitable battery system, wherein manufacturing costs are advantageously reduced and operational reliability is expediently increased.

With regard to the method, this object is achieved according to the invention by the features of claim 1 and with regard to the battery system by the features of claim 8. Advantageous further developments and refinements are the subject of the respective subclaims.

The process is used to produce a battery system. The battery system is preferably a component of a motor vehicle in its intended condition. The battery system is suitable for this, in particular intended and set up. The motor vehicle is preferably land-based and preferably has a number of wheels, at least one of which, suitably several or all of them, are driven by means of a drive. In particular, one, preferably several, of the wheels is designed to be controllable. This makes it possible to move the motor vehicle independently of a specific roadway, for example rails or the like. It is expediently possible to position the motor vehicle essentially anywhere on a road that is made in particular from asphalt, tar or concrete. The motor vehicle is, for example, a commercial vehicle, such as a truck or a bus. However, the motor vehicle is particularly preferably a passenger car (car). In a further alternative, the motor vehicle is, for example, a ship, boat, or aircraft, such as an airplane, a helicopter or multicopter.

The motor vehicle is expediently moved by means of the drive. For example, the drive, in particular the main drive, is at least partially designed to be electrical, and the motor vehicle is, for example, an electric vehicle. The electric motor is operated, for example, by means of the battery system, which is suitably designed as a high-voltage battery. With others In short, the battery system is the high-voltage battery. An electrical direct voltage is expediently provided by means of the high-voltage battery, the electrical voltage being, for example, between 200 V and 800 V and, for example, essentially 400 V. An electrical converter is preferably arranged between the battery system and the electric motor, by means of which the current supply to the electric motor is adjusted. In an alternative, the drive also has an internal combustion engine, so that the motor vehicle is designed as a hybrid motor vehicle. In an alternative, a low-voltage electrical system of the motor vehicle is fed by means of the battery system, and in particular an electrical direct voltage of 12 V, 24 V or 48 V is provided by means of the battery system.

In a further alternative, the battery system is a component of an industrial truck, an industrial plant, a hand-held device, such as a tool, in particular a cordless screwdriver. In a further alternative, the battery system is part of an energy supply and is used there, for example, as a so-called buffer battery. In a further alternative, the battery system is a component of a portable device, for example a portable cell phone, or another wearable. It is also possible to use such a battery system in camping, model building or other outdoor activities.

The battery system has a housing in which several battery cells are arranged. The battery cells are preferably connected to an inner wall of the housing and thus stabilized. For example, the battery cells are arranged directly in the housing and are in particular inserted into the housing before the housing is closed. The housing has a first housing part and a second housing part which are attached to one another. Here, the battery cells are at least partially surrounded by each of the housing parts.

The battery cells are, for example, at least partially connected electrically in series and/or electrically in parallel. The battery cells are preferably identical to one another and are designed, for example, using so-called pouch cells, round cells or prismatic cells. In a further development, several of the battery cells are combined to form a battery module and arranged in a module housing of the respective battery module. The battery modules are arranged in the housing and consequently also the battery cells. In particular, the battery modules are identical to one another. The battery modules are suitably at least partially connected electrically in series and/or electrically in parallel. The battery cells are expediently designed to be rechargeable and are preferably so-called secondary batteries. In particular, these each have one or more galvanic elements, each comprising an anode, a cathode and a separator arranged between them. The battery cells preferably each have lithium ions as working ions.

The method provides that a metal part provided with a coating is used as the first housing part. The metal part is made, for example, from steel and/or aluminum, for example pure aluminum or an aluminum alloy. The metal part is created, for example, by deep drawing and/or a sheet metal part. For example, in the method, the metal part is first manufactured or at least provided with the coating in a previous step. For example, the metal part is provided with the coating using a dip-coating process, or the coating is sprayed onto the metal part, for example. For example, the metal part is covered with the coating over its entire surface. Suitably the coating is a varnish. In particular, the coating is such that it is electrically insulating. Preferably, the coating is such that corrosion of the metal part is avoided or at least reduced, particularly in an environment in which the battery system is to be used.

In a subsequent step, several recesses are pressed into the first housing part, which therefore do not extend through the entire first housing part. In other words, the depressions are not continuous openings, but rather are designed in particular like blind holes. The depressions are at least partially pressed into the metal part. Each of the depressions is pressed in such a way that a bulge is created adjacent to it. In other words, due to the depression, the material of the first housing part is pressed out of it when the respective depression is created, so that it is deposited adjacent to the depression and results in the bulge. Due to the bulge, the thickness of the first housing part is increased there, whereas the thickness is reduced in the area of the recess. In other words, when the depressions are created, the material is not pushed out on the opposite side of the first housing part, but material is deposited around the respective depression. For this purpose, the first housing part is placed, for example, on a comparatively hard surface before the depressions are made. Conveniently located All depressions and thus also the bulges are on a common side of the first housing part. In summary, when pressed in, the material of the first housing part is pressed out of the recess and pushed onto the bulge.

Due to the indentation, the bulge is created, and as a result a surface of the first housing part is locally enlarged, namely by means of the respective recess and the corresponding bulge. When creating the depressions, the coating is at least partially held there, so that it is stretched comparatively far in the area of the respective bulge and expediently bursts open. In other words, the depressions in particular are created in such a way that the coating bursts open in the area of the respective bulge. The bulges, for example, surround the respective depression and are therefore ring-shaped. However, the depressions are particularly preferably introduced in such a way that the respective bulge only occurs on one side or a section around the respective depression. As a result, the height of the bulge is increased, so that the coating will burst open there. In particular, all depressions are created essentially the same, so that all bulges are also essentially the same.

In a further step, the first housing part is attached to a second housing part, with the bulges resting on the second housing part. In other words, in particular, the first housing part is initially positioned with respect to the second housing part in such a way that the first housing part rests on the second housing part at least in sections via the bulges, in particular a mechanical direct contact between the first housing part and the second housing part being realized by means of the bulges . Due to the attachment, the two housing parts are in particular immovable relative to one another. According to the method, the two housing parts around which the battery cells are expediently arranged, for example before or after they are attached to one another, so that the battery cells are surrounded by the housing formed by the two housing parts.

Due to the bulges, the two housing parts are at least partially at a certain distance from one another, which is determined based on the height of the bulges. In other words, the two housing parts are spaced apart from one another between the bulges, the distance being determined based on the height of the bulges. For example, a seal or another component is arranged within these areas, whereby the certain distance, which is not exceeded, ensures that there is no excessive mechanical stress. In other words, the bulges act as spacers between the two housing parts, for which no additional components are required. Manufacturing costs are therefore reduced.

The second housing part is in particular made of a metal, such as aluminum or steel. Preferably, the area or areas of the second housing part on which the bulges mechanically rest directly is electrically conductive. The two housing parts are therefore electrically contacted with one another due to the bulges. The second housing part is, for example, uncoated, and the second housing part is expediently made of a comparatively robust metal, so that no corrosion occurs there. Alternatively, the second housing part is also provided with a coating, and this is removed locally, for example. Alternatively, corresponding depressions are also made in the second housing part, so that assigned bulges also arise there. In particular, the two housing parts are positioned relative to one another in such a way that the bulges of the first housing part rest on the bulges of the second housing part, and the two housing parts are fastened to one another in this position. This ensures that the two housing parts are electrically contacted with each other.

Suitably, the second housing part is electrically contacted with ground. The first housing part is therefore also electrically contacted with ground and therefore has ground as the electrical potential. In summary, the two housing parts are at the same electrical potential, and the battery cells are shielded in particular by means of the two housing parts, so that electromagnetic compatibility (EMC) is increased.

For example, the two housing parts are fastened to one another using one or more rivets. Robustness is thus increased. Alternatively, a connection can be made using screws, for example. The two housing parts are thus releasably attached to one another, so that maintenance or repairs, for example, are simplified. Particularly preferably, however, the first housing part is attached to the second housing part by means of adhesive. In other words, the two housing parts are glued together for fastening. Due to the bulges, there is a defined distance between the two housing parts, so that a defined thickness of the adhesive is achieved. In particular, the height of the bulges is The adhesive used is adjusted so that the two housing parts are attached to one another comparatively securely. In summary, the thickness of the adhesive layer created using the adhesive is adjusted by means of the bulges, which is why no such particles, such as glass balls or the like, are required within the adhesive. Thus, an adhesive force of the adhesive is increased, and it is possible to use a comparatively inexpensive adhesive, which is why manufacturing costs are reduced. In addition, the areas between the bulges are filled in particular by means of the adhesive, and the bulges are preferably surrounded on the circumference by means of the adhesive, so that a sealing effect is also achieved by means of the adhesive. At least, however, the adhesive is preferably used to achieve a tight contact between the two housing parts. In particular, the adhesive, preferably the amount, is dimensioned such that it does not cover the bulges at the ends, so that the two housing parts mechanically lie directly against one another via the bulges.

The depressions and bulges are expediently introduced into the edge of the first housing part, and these are therefore less than 5 cm, 2 cm or 1 cm away from an edge of the first housing part. Therefore, the arrangement of the battery cells in the housing is not affected by the bulges and depressions. If the adhesive or another seal is used, a comparatively large volume of space is surrounded by it. The depressions are particularly preferably pressed into the first housing part along a line. The line is in particular a straight line and, for example, only has a corresponding change in direction in a possible corner region of the first housing part. In particular, all of the depressions are at the same distance from an edge of the first housing part. Due to the arrangement along the line, production is simplified and it is only necessary to move the tool used to produce the depressions along the line, preferably the straight line. The distance between the depressions is expediently the same and/or between 0.01 cm and 2 cm, in particular between 0.5 mm and 2 mm. In this way, a comparatively stable contact of the two housing parts against one another is achieved, with the effort required to produce the recesses being comparatively manageable. Preferably, the two housing parts are fastened to one another by means of the adhesive, and the adhesive is applied, in particular in strips, to the first housing part along the line, for example laterally offset from it, or on it. This means that even with automated application of the adhesive there is an orientation, which is why waste is reduced. This also ensures that the local distance between the two housing parts resulting from the bulges is safely filled by the adhesive, which is why the two housing parts are fastened to one another in a comparatively robust and tight manner.

Particularly preferably, further such depressions are pressed into the first housing part along a further line, with corresponding respective bulges also resulting in the further depressions. The further line is in particular parallel to the line or at least preferably has the same distance from it. It is therefore possible to press in one of the depressions that is assigned to the line and one of the further depressions that is assigned to the further line using a common tool, which is why the manufacturing time and manufacturing effort are not increased. If, for example, all depressions assigned to the line are pressed in in one work step, it is possible, for example, to use the same tool to create the further depression of the further line. Due to the further depressions, a more stable contact between the two housing parts is achieved. Particularly preferably, any adhesive between the two lines is applied to the first housing part. The two lines make applying the adhesive easier. This also ensures that the adhesive is not compressed comparatively strongly on one side, so that it does not escape uncontrollably between the two housing parts. This ensures a minimum thickness of the adhesive and reduces waste.

For example, the depressions are made using a stamp. However, it is particularly preferred to use a grain to create the depressions. In other words, the metal part is punched to create the recesses. A metal pin is therefore used, which in particular has a tip. The tip is preferably made of steel, preferably hardened steel. The grain can therefore be used to produce a large number of such depressions, with wear being comparatively low. The coating is held locally in the area of the recess by means of the grain, so that it is ensured that the bulge is created primarily by means of the material of the metal part, with the coating being stretched comparatively far there, so that it tears open there. It is also possible using the body to always create the depressions in the same way as one another, so that bulges result essentially have the same height. For example, each of the depressions is created by means of a single blow on the grain. Alternatively, several high-frequency impacts are used, so that the maximum force that can be applied is reduced. For example, if the depressions are pressed along the line and the further depressions are pressed along the further line, use a double punch. This makes it possible to introduce both a recess and one of the further recesses in one work step, with the same distance always being present between them. Manufacturing time is therefore shortened.

For example, the grain is placed perpendicular to the first housing part, i.e. in particular to the surface of the first housing part in the area of the recess to be created, i.e. at least locally. Particularly preferably, however, the grain is placed obliquely with respect to the first housing part than with respect to that area of the first housing part into which the recess is to be made, i.e. at least locally. Due to the oblique attachment, the recess runs at least partially obliquely, so that the material of the metal part is pushed laterally. This makes it possible to create the bulges with a comparatively large height or thickness, whereby the depth of the depression can be chosen to be comparatively small. In particular, an angle between the grain and the first housing part or at least the direction of the force acting on the grain and the first housing part is less than 60° or, for example, less than or equal to 45°. In this way, the bulge can be pushed on efficiently, preventing the centerpiece from slipping off the first housing part.

For example, the two housing parts are shell-like, and in particular the complete housing is formed by this. However, it is particularly preferred to use a cover as the first housing part and a frame as the second housing part, with the second housing part being designed as a hollow cylindrical shape. In particular, all battery cells, in particular the battery modules, are surrounded on the circumference by means of the second housing part. In particular, the frame is closed at the end by means of the first housing part. In other words, the first housing part is attached to one of the end faces of the hollow cylinder forming the frame. This makes arranging the battery cells easier, with the weight of the battery system being comparatively low. The frame essentially provides mechanical integrity, whereas the cover essentially provides flat coverage. In particular, the metal part of the first housing part is a sheet metal that is, for example, flat or has stiffening ribs. Alternatively or in combination with this, the metal part and thus also the first housing part is at least partially designed like a shell. Preferably, the second housing part is made of a comparatively robust metal, such as aluminum or preferably steel, and/or in particular has a comparatively large thickness. For example, the first or second housing part is the cover or the frame, initially separate from other components of the motor vehicle, provided the battery system is a component of a motor vehicle. For assembly, at least one of the housing parts is attached to other components of the motor vehicle. In an alternative, at least one of the two housing parts serves to provide additional functions. For example, one of the housing parts is provided by means of an underbody of the motor vehicle.

Particularly preferably, the housing comprises a third housing part which is attached to the frame on the opposite side. The frame is therefore closed on both sides by means of another housing part. In particular, the third housing part is structurally identical to the first housing part, or the third housing part, for example, also has at least one metal part that is provided with a coating. For example, the third housing part is attached to the second housing part in an electrically insulating manner. Alternatively, corresponding depressions are also made in the third housing part, so that the bulges are created, which are placed on the second housing part. In other words, the third housing part is attached to the second housing part, with the bulges of the third housing part resting on the second housing part.

The battery system comprises a housing with a first housing part and a second housing part, with a plurality of battery cells being arranged in the housing. For example, the battery cells are arranged separately in the housing or combined into several battery modules that are arranged in the housing. For example, the housing is formed with the two housing parts or expediently has further components. The first housing part is a metal part provided with a coating, with several recesses being pressed into the first housing part in such a way that a bulge is created adjacent to them. In particular, the coating is torn or chipped off in the area of the bulges. The first housing part is attached to the second housing part, and the bulges rest on the second housing part.

In particular, the two housing parts are therefore electrically connected to one another. Due to the electrical contacting, a Faraday cage is provided in particular, by means of which the electromagnetic radiation is shielded from the housing to the outside, but also from the outside to the inside. is. This means, for example, that disruptions to mobile phone networks or the like are avoided. For example, no further components are connected to the first housing part. Particularly preferably, however, further components are attached to the first housing part, such as the battery cells and/or connections, which are guided in particular through the metal part, and by means of which electrical contacting of the battery cells arranged in the housing can expediently take place from outside.

For example, the battery system additionally includes a battery management system, which is also arranged within the housing and with which, in particular, the individual battery cells are electrically contacted. In particular, an interface is introduced into the housing, for example one of the housing parts, via which electrical contacting of the battery cells arranged in the housing is possible, in particular via the battery management system. The possible connections are expediently at least partially formed by means of the interfaces. The housing is particularly preferably designed to be closed, so that penetration of foreign particles into the battery cells is prevented.

The invention further relates to a motor vehicle with such a battery system. The motor vehicle is preferably land-based. For example, the motor vehicle is a commercial vehicle, such as a truck or bus. The motor vehicle is preferably a passenger car (car). The motor vehicle has a drive with an electric motor. For example, the drive is a component of an auxiliary unit or particularly preferably a main drive, by means of which the motor vehicle moves. The drive, in particular the electric motor, is powered by the battery system, which is suitable, in particular provided and set up for this purpose. A converter is expediently arranged between the electric motor and the battery system. The battery system is preferably a high-voltage battery, by means of which in particular an electrical direct voltage between 300 V and 900 V, preferably 400 V or 800 V, is provided.

The advantages and developments described in connection with the method can also be transferred to the battery system/motor vehicle and to each other and vice versa.

• 1 schematisch vereinfacht ein Kraftfahrzeug, das ein Batteriesystem aufweist,
• 2 schematisch in einer Explosionsdarstellung das Batteriesystem,
• 3 ein Verfahren zur Herstellung des Batteriesystems,
• 4 einen Körner, mittels dessen Vertiefungen in ein erstes Gehäuseteil erstellt werden,
• 5 vergrößert eine der Vertiefungen, zu der benachbart eine Aufwölbung entstanden ist,
• 6 in einer Draufsicht ausschnittsweise das erste Gehäuseteil, in das Vertiefungen entlang zweier Linien eingebracht sind,
• 7 einen weiteren Körner, und
• 8, 9 schematisch ausschnittsweise das erste Gehäuseteil, das an ein zweites Gehäuseteil gefügt wird.

An exemplary embodiment of the invention is explained in more detail below with reference to a drawing. Show in it:

• 1 schematically simplified a motor vehicle that has a battery system,
• 2 schematically in an exploded view the battery system,
• 3 a method for producing the battery system,
• 4 a grain, by means of which depressions are created in a first housing part,
• 5 enlarges one of the depressions adjacent to which a bulge has arisen,
• 6 in a plan view, a detail of the first housing part, in which recesses are made along two lines,
• 7 another grain, and
• 8th , 9 schematically a section of the first housing part, which is joined to a second housing part.

Corresponding parts are provided with the same reference numbers in all figures.

In 1 A motor vehicle 2 is shown in a schematically simplified form in the form of a passenger car (car). The motor vehicle 2 has several wheels 4, by means of which contact with a road (not shown) takes place. At least some of the wheels 4 are driven by a drive 6, which is therefore a main drive. The drive 6 only has electric motors, so that the motor vehicle 2 is designed as an electric vehicle. The electric motors of the drive 6 are powered via a converter, not shown, which is powered by a battery system 8, which is a high-voltage battery. The battery system 8 provides an electrical direct voltage of 800 V.

In 2 The battery system 8 is shown in a schematically simplified manner in an exploded view. The battery system 8 has a housing 10 which has a first housing part 12, a second housing part 14 and a third housing part 16 and is formed by this. The second housing part 14 is a hollow cylindrical frame whose cross section is rectangular. The second housing part 14 is made of a metal, namely an uncoated steel, such as stainless steel. The first and third housing parts 12, 16 are each covers, by means of which the frame 14 is closed at the ends. In other words are the first and third housing parts 12, 16 arranged at the opposite ends of the hollow cylinder forming the frame. In summary, the first and third housing parts 12, 16 each form covers which are arranged on the end faces of the frame and are attached to it. In the simplified representation shown, the first and third housing parts 12, 16 are flat. However, it is also possible for these to be at least partially shell-like, i.e. curved away from the frame, so that an enlarged volume of space is surrounded by the housing parts 12, 14, 16. In the example shown, the first and third housing parts 12, 16 are, for example, constructed in the same way as one another. In the assembled state, the three housing parts 12, 14, 16 are fastened to one another in a fluid-tight manner, so that the volume of space surrounded by the housing 10 is protected from foreign particles and moisture in the environment of the battery system 8.

Several battery modules 18 are arranged within the housing, of which only two are shown here. The battery modules 18 are identical to one another and are connected to a battery management system, not shown, by means of which the battery modules 18 are also connected; at least some of the battery modules 18 are in series with one another, and these series connections are again connected in parallel with one another. Here, for example, the connection is always the same, or the connection of the battery modules 18 can be changed at least to a small extent using the battery management system.

Each of the battery modules 18 has several battery cells 20, the battery cells 20 being identical to one another, of which only three are shown. Some of the battery cells 20 of each battery module 18 are electrically connected in series and these in turn are electrically connected in parallel. The electrical voltage provided by each of the battery modules 18 is therefore greater than the electrical voltage provided by each of the individual battery cells 20. The battery cells 20 are, for example, pouch cells or prismatic cells and are each designed as secondary batteries. In summary, the battery cells 20 are arranged in the housing 10, the housing 10 comprising the first housing part 12 and the second housing part 14.

In 3 a method 22 for producing the battery system 8 is shown. In a first step 24, a metal part 26 is provided. The metal part 26 is made from an aluminum sheet, which is brought into the shape of the first housing part 12 by deep drawing. The metal part 26 is then provided over its entire surface with a coating, 28, namely a lacquer, using a dip-coating process. In other words, the metal part 26 is coated with the coating 28. The thickness of the coating 28 is less than 0.1 mm. The workpiece created in this way is used as the first housing part 12. In summary, the metal part 26 provided with the coating 28 is used as the first housing part 12.

In a subsequent second step 30, an in 4 grain 32 shown, the metal part 26 is marked. The center punch 32 is a metal pin with a conical tip 34 made of hardened steel. The grain 32 is placed obliquely relative to the first housing part 12, so that the grain 32 has an angle of 45° to the surface of the first housing part 12 in the area of attachment, i.e. the mechanical contact. Subsequently, several high-frequency impacts are applied to the grain 32 along the direction of expansion, so that a depression 36 is created. In other words, the depressions 36 are pressed into the first housing part 12 and thus also into the metal part 26 by means of the punch 32.

In 5 one of the depressions 36 is shown enlarged. Due to the oblique positioning of the grain 32, the course of the recess 36 is also oblique to the surface of the first housing part 12. Due to the indentation of the material of the first housing part 12, a bulge 38 thus results adjacent to the recess 36 on the side opposite the grain 32. When the depression 36 is pressed in and the bulges 38 are created, the surface of the first housing part 12 is locally enlarged. The coating 28 is held locally in the recess 36 by means of the grain 32, whereas the coating 26 is stretched comparatively far over the bulge 38, so that it tears open and bursts there. The coating 28 is therefore no longer present in the area of the bulge 38.

The height of the bulge 36 depends on the depth of the recess 36 and the material of the first housing part 12. The depth of the recess 36 in turn depends on the force applied to the grains 32 and the material of the first housing part 12. Since the material of the housing part 12 is always the same, the height of the depression 38 is therefore only dependent on the force applied to the grains 32, which is applied by means of the high-frequency impacts. According to the method 22, the same force is always applied, so that all bulges 38 have essentially the same height. The height of the bulges 38 is 0.5 mm.

The depressions are, as in 6 shown in a top view of the first housing part 12, introduced into the first housing part 12 along a line 40, the grains 32 being placed in such a way that the bulges 38 are also located on the line 40. Here, all depressions 36 are offset in the same direction with respect to the respective bulge 38. In summary, the depressions 36 are pressed into the first housing part 12 along the line 40. The distance between adjacent depressions 36 along line 40 is 1 mm. In summary, the depressions 38 are pressed into the first housing part 12 in such a way that one of the bulges 38 results adjacent to them.

In addition, in the second work step 30, further depressions 44 are introduced along a further line 42, which runs parallel to the line 40 or at least at the same distance from it, which are created in the same way as the depressions 36, namely by means of the punch 32 This also results in corresponding bulges 38, which are also referred to as further bulges. Here too, the bulges 38 are located on the further line 42 and are always offset in the same direction with respect to the respective further depressions 44. The distance between the two lines 40, 42 from one another is 1 cm.

In 7 a modification of the grain 32 is shown, which is designed as a double grain. This now includes two mutually parallel tips 34, which are at a fixed distance from one another. When in use, one of the recesses 38 and one of the further recesses 44 are pressed in by means of the center punch 32, so that the number of the center pins 32 being placed on the first housing part 12 is reduced.

In a subsequent third step 48, an adhesive 50 is applied to the first housing part 12 between the two lines 40, 42 and thus between the depressions 38 and the further depressions 44, as in 8th shown schematically in simplified form.

In a subsequent fourth step 52, the second housing part 14 is placed on the first housing part 12 or vice versa, the orientation of the two housing parts 12, 14 being such that the bulges 38 come to rest on the second housing part 14, as in 9 shown. Here, the adhesive 50 is compressed between the two housing parts 12, 14, with a certain thickness of the adhesive 50 remaining due to the height of the bulges 38. In other words, the adhesive 50 is not squeezed out between the two housing parts 12, 14. The height of the bulges 38 is set in such a way that the adhesive force of the adhesive 50 used is optimal at the thickness realized by means of the bulges 38. Here, the amount of adhesive 50 is dimensioned such that it does not accumulate above the bulges 38, so that the two housing parts 12, 14 are electrically contacted with one another by means of the bulges 38, which are free of the coating 28. In summary, in the fourth step 52, the two housing parts 12, 14 are fastened to one another, namely by means of the adhesive 50. By means of the adhesive 50, a fluid-tight contact of the two housing parts 12, 14 against one another is achieved.

The third housing part 16 is also attached to the second housing part 14 in the same way. In other words, corresponding depressions are also pressed into the third housing part 16, so that corresponding bulges result. The third housing part 14 is attached to the second housing part 14 by means of the adhesive, with the bulges of the third housing part 16 resting on the second housing part 14. The third housing part 16 is therefore electrically contacted with the second housing part 14 and therefore also with the first housing part 12. Before the housing 10 is completely closed, the battery module 18 is inserted.

When installed in the motor vehicle 2, the frame 14 is electrically connected to the potential of ground, for which a corresponding line is connected to it. The metal part 26 therefore also has ground as an electrical potential. As a result, the battery cells 20 arranged therein are protected from any electromagnetic fields by means of the housing 10, so that electromagnetic compatibility (EMC) is increased. Due to the coating 28, corrosion of the metal part 26 is avoided.

The invention is not limited to the exemplary embodiment described above. Rather, other variants of the invention can also be derived from this by the person skilled in the art without departing from the subject matter of the invention. In particular, all of the individual features described in connection with the exemplary embodiment can also be combined with one another in other ways without departing from the subject matter of the invention.

Reference symbol list

2

motor vehicle

4

wheel

6

drive

8th

Battery system

10

Housing

12

first housing part

14

second housing part

16

third housing part

18

Battery module

20

Battery cell

22

Proceedings

24

first step of work

26

metal part

28

Coating

30

second step

32

grains

34

Great

36

deepening

38

Bulging

40

line

42

another line

44

further depth

48

third step

50

adhesive

52

fourth step

Claims (8)

Method (22) for producing a battery system (8) which has a housing (10) with a first housing part (12) and a second housing part (14), a plurality of battery cells (20) being arranged in the housing (10). which one - a metal part (26) provided with a coating (28) is used as the first housing part (12), - Several recesses (36) are pressed into the first housing part (12) in such a way that a bulge (38) is created adjacent to them, and - The first housing part (12) is fastened to the second housing part (14), the bulges (38) resting on the second housing part (14). Procedure (22) according to Claim 1 , characterized in that the first housing part (12) is attached to the second housing part (14) by means of adhesive (50). Procedure (22) according to Claim 1 or 2 , characterized in that the depressions (36) are pressed into the first housing part (12) along a line (40). Method (22) according to one of the preceding claims, characterized in that such further depressions (44) are pressed into the first housing part (12) along a further line (42), the adhesive (50) being between the two lines (40, 42) is applied to the first housing part (12). Method (22) according to one of the Claims 1 until 4 , characterized in that the depressions (36) are introduced by means of a punch (32). Procedure (22) according to Claim 5 , characterized in that the grain (32) is placed obliquely with respect to the first housing part (12). Method (22) according to one of Claims 1 until 6 , characterized in that a cover is used as the first housing part (12) and a frame is used as the second housing part (14). Battery system (8), which has a housing (10) with a first housing part (12) and a second housing part (14), a plurality of battery cells (20) being arranged in the housing (10), the first housing part (12) being a is a metal part (26) provided with a coating (), wherein a plurality of recesses (38) are pressed into the first housing part (12) in such a way that a bulge (38) results adjacent thereto, the first housing part (12) being on the second housing part (14) is attached, and wherein the bulges (38) rest on the second housing part (14).

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