Method for providing a housing part for an electrical energy storage device with at least one coating

Abstract

The invention relates to a method for providing a housing part (10) for an electrical energy storage device designed to store electrical energy with at least one coating, in which: the housing part (10) has, on its inner side (12) facing a receiving space for at least one storage element of the energy storage device provided for storing the electrical energy in the completely manufactured state of the energy storage device, at least one filter device (14) delimiting at least one discharge channel and at least one filter channel, which has a first filter part (16) with at least one first flow opening opening at one end into the discharge channel and the other end into the filter channel, and a second filter part which is designed separately from the first filter part (16),connected to the first filter part and spaced from the first filter part (16) to form the filter channel extending between the filter parts and thereby delimited by the filter parts.

Description

[0001] The invention relates to a method for providing a housing part for an electrical energy storage device designed to store electrical energy with at least one coating.

[0002] DE 10 2016 117 442 A1 discloses a battery housing for accommodating a traction battery. DE 10 2021 000 684 A1 discloses an energy storage device for storing electrical energy for a motor vehicle. Furthermore, DE 10 2021 001 289 A1 discloses a housing with at least two separate housing parts, each formed from a light metal and connected to one another. Furthermore, DE 10 2021 005 957 A1 discloses an energy storage device for storing electrical energy for a motor vehicle.

[0003] The object of the present invention is to provide a method by means of which a housing part for an electrical energy storage device can be particularly advantageously provided with at least one coating, i.e. coated.

[0004] This object is achieved by a method having the features of patent claim 1. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.

[0005] The invention relates to a method for providing a housing part for an electrical energy storage device, in particular of a motor vehicle, designed for the storage, in particular electrochemical storage, of electrical energy with at least one coating. This means that in the method at least a partial area of ​​the housing part is provided with the coating. The partial area of ​​the housing part is also referred to as the first partial area. When reference is made above and below to the partial area, this means the first partial area unless otherwise stated. The coating is also referred to as the first coating. When reference is made above and below to the coating, this means the first coating unless otherwise stated. In particular, for example, the coating is applied at least to the partial area, whereby the partial area is provided with the coating and thus coated.

[0006] When the method(s) are mentioned above and below, this means, unless otherwise stated, the method according to the invention for providing the housing part with the coating. For example, the housing part is used in a method for producing the electrical energy storage device in order to produce the electrical energy storage device from the housing part. For this purpose, for example, in the method for producing the electrical energy storage device, the housing part is connected as the first housing part to a second housing part that is formed separately from the first housing part. When the housing part is mentioned above and below, this means, unless otherwise stated, the first housing part.

[0007] According to the invention, it can be ensured that each holding element is coated once, i.e. provided with one of the coatings.

[0008] In the fully manufactured state of the electrical energy storage device, which in its fully manufactured state has the housing part, the electrical energy storage device has a receiving space, also referred to as a receiving area. In the fully manufactured state of the energy storage device, the receiving space is partially delimited by the housing part, in particular directly. In particular, in its fully manufactured state, the electrical energy storage device has a housing, also referred to as a storage housing, which comprises the first housing part and the second housing part and delimits the receiving space, in particular directly. Thus, in the fully manufactured state of the electrical energy storage device, the receiving space is partially delimited by the first housing part and partially by the second housing part, in particular directly in each case.In addition, the electrical energy store, in its fully manufactured state, has at least one storage element, designed, for example, as a storage cell, by means of which the electrical energy is to be stored or is stored, in particular electrochemically. In particular, it is conceivable that the electrical energy store, in its fully manufactured state, has a plurality of storage elements, designed, for example, as storage cells, by means of which the electrical energy is to be stored or is stored, in particular electrochemically. Very particularly, the electrical energy store is an energy store disclosed in DE 10 2021 000 684 A1, the disclosure of which is to be regarded in its entirety as part of the present disclosure. For example, the storage cell is a lithium-ion cell.Preferably, the electrical energy storage device is a high-voltage component whose electrical voltage, in particular electrical operating or nominal voltage, is preferably greater than 50 volts, in particular greater than 60 volts, and most preferably amounts to several hundred volts.

[0009] In the method according to the invention, the housing part has at least one filter device, also referred to as the first filter device, on its inner side facing the receiving space for the at least one storage element of the energy storage device in the fully manufactured state of the electrical energy storage device. When reference is made above and below to the filter device, this refers to the first filter device unless otherwise stated. This means that in the fully manufactured state of the electrical energy storage device, the inner side of the housing part faces the receiving space of the electrical energy storage device, wherein, for example, in the fully manufactured state of the energy storage device, the receiving space is partially and directly delimited by the inner side of the housing part.The filter device delimits at least one discharge channel, also referred to as the first discharge channel, and at least one filter channel, also referred to as the first filter channel. When reference is made above and below to the discharge channel, this means, unless otherwise stated, the first discharge channel of the first filter device. When reference is made above and below to the filter channel, this means, unless otherwise stated, the first filter channel of the first filter device. The filter device has a first filter part, which has at least one first flow opening, one end opening into the discharge channel and the other end into the filter channel. The filter device also has a second filter part, which is formed separately from the first filter part and is connected, in particular directly, to the first filter part.Preferably, the filter parts are formed separately from the housing part and are held, for example, at least indirectly, in particular directly, on the housing part, so that, for example, the filter device is formed separately from the housing part and is held at least indirectly, in particular directly, on the housing part. It is preferably provided that the filter device delimits the discharge channel at least partially, in particular directly. Furthermore, it is conceivable that the filter device delimits the filter channel at least predominantly and thus more than half or completely, in particular directly. The first filter part is formed, for example, from a sheet metal and is therefore designed as a first filter sheet. Alternatively or additionally, for example, the second filter part is formed from sheet metal and is therefore designed as a filter sheet.The filter parts are formed separately from one another and are preferably, in particular directly, connected to one another and thus held together. In particular, the discharge channel is at least partially, in particular directly, delimited by the first, inner filter part, which is therefore also referred to as the first channel or inner channel. The first filter part has at least one first flow opening, which opens at one end into the discharge channel and at the other end into the filter channel. The second filter part is spaced from the first filter part to form the filter channel which runs between the filter parts and is thus delimited, in particular directly, by the filter parts.In particular, the respective filter parts are respective solid bodies or walls or wall parts, wherein, for example, a surface of the second filter part facing the first, inner filter part and a surface of the first filter part facing the second filter part each directly delimit the filter channel, so that the surfaces face one another. The second filter part is also referred to as the outer filter part or outer channel. In addition, the second filter part has at least one second flow opening, which opens at one end into the filter channel between the filter parts and, when the energy storage device is fully manufactured, at the other end into the receiving space. The flow openings are arranged offset from one another and can be flowed through by a gas flowing out of the storage element, in particular during a thermal event or during thermal propagation, and thus originating from the storage element.The second flow opening can thus be flowed through by the gas flowing out of the storage element and into the receiving space, containing particles, so that the gas and in particular also the particles can be introduced into the filter channel via the second flow opening. By means of the filter channel, the gas can be guided to the first flow opening, through which the gas can also flow, and via which the gas can be introduced into the discharge channel. It can be seen that the discharge channel is arranged downstream of the filter channel in the flow direction of the gas flowing from the second flow opening towards the first flow opening and thereby through the filter channel.On its way from the receiving space to the discharge channel, the gas first flows through the second flow opening, then through the filter channel, and then through the first flow opening. The second flow opening serves as an inlet or introduction opening through which the gas can be discharged from the receiving space into the filter channel. The first flow opening serves as a discharge or outlet or introduction opening through which the gas can be discharged from the filter channel and introduced into the discharge channel.

[0010] Since the flow openings are arranged offset from one another, the inlet opening (second flow opening), for example, is at least partially, in particular at least predominantly or completely, overlapped by a wall region of the first, inner filter part. It is preferably provided that the outlet opening (first flow opening) is at least partially, in particular at least predominantly and thus at least more than half or completely, overlapped by a wall region of the second, outer filter part. As a result, for example, at least some of the particles impact against at least one of the wall regions when the gas flows from the receiving space to and into the discharge channel, so that the particles initially contained in the gas can be at least partially filtered out of the gas by means of the filter device.Since the filter parts are spaced apart from one another and are designed as walls or have wall regions, the filter device is a multi-walled filter device, or the filter channel is a multi-walled filter channel, or the filter device forms at least one multi-walled venting channel, which is also referred to as a venting channel, wherein the gas can be discharged from the receiving space in a defined manner via the venting channel and guided into the discharge channel and, for example, via this channel to an area surrounding the housing or energy storage device. In other words, it is conceivable that the filter channel and the discharge channel form the previously described venting channel, and are thus components of the venting channel.The multi-walled design of the vent channel allows for particularly advantageous particle filtration, which allows any particles contained in the gas to be filtered out particularly effectively. The thermal event described above occurs, for example, when the storage element shorts.

[0011] The invention particularly relates to a functional extension of an existing venting channel by at least one retaining element or a plurality of retaining elements. Thus, an internal coating receptacle or a retaining element of the cover can be made possible by an existing venting channel, eliminating the need for additional separate components.

[0012] In the method according to the invention, at least one retaining element is provided on the inside of at least one of the filter parts, which retaining element is thus arranged in the receiving space when the electrical energy storage device is fully manufactured. The retaining element is also referred to as the first retaining element. When reference is made above and below to the retaining element, this refers to the first retaining element, unless otherwise stated.

[0013] In the method, the holding element is coupled to a holding device that is formed separately from the housing part and thus separately from the filter device, in particular one that can be detached non-destructively, whereby the housing part is coupled to the holding device, in particular exclusively, via the holding element. Furthermore, the method provides that the housing part is coupled to the holding device via the holding element, while at least the partial area of ​​the housing part is provided with the coating. Thus, by means of the holding device and by the fact that the holding device is coupled to the housing part via the holding element, the housing part can be held, for example, in at least one advantageous position or orientation, while at least the partial area of ​​the housing part is provided with the coating. The holding device is also referred to as the first holding device.When reference is made above and below to the holding device, this shall be understood to mean the first holding device unless otherwise stated.

[0014] Since the holding element is coupled to the holding device while at least the partial area of ​​the housing part is coated, the holding element, for example, touches the holding device, in particular directly. In particular, the holding device touches a contact point of the holding element, in particular directly. This can result in a coating defect at the contact point. This means that the defect is not coated but remains free of the coating.Since the defect is the contact point, and since the defect is a location on the holding element, and since the holding element and thus the defect are arranged on the inside and thus in the receiving space in the fully manufactured state of the electrical energy storage device, the defect or its formation can be accepted because in the fully manufactured state of the electrical energy storage device, the housing parts are firmly and tightly connected to one another, so that no corrosive media can penetrate into the receiving space and thus to the defect. Thus, the invention makes it possible, in particular, to provide the entire outer side of the housing part with the coating, which, in the fully manufactured state of the electrical energy storage device, faces away from the interior and towards the surroundings of an electrical energy storage device.As a result, for example, during operation of the motor vehicle, corrosive media from the environment of the motor vehicle and thus of the electrical energy storage device may come into contact with the coating, but not in direct contact with the housing part or an outer side, and such corrosive media cannot penetrate into the receiving space and thus cannot penetrate to the defect, so that excessive corrosion of the electrical energy storage device can be advantageously avoided.

[0015] In the invention, for example, the holding element is used as a so-called coating receptacle and / or the holding element delimits, for example, a coating receptacle at least partially and preferably directly, wherein the holding device is coupled to the coating receptacle, in particular in a non-destructively detachable manner, and wherein the housing part is coupled to the holding device via the coating receptacle, in particular in a non-destructively detachable manner, while at least the partial area of ​​the housing part is provided with the coating. Since the holding element is provided on the at least one filter part, the at least one filter part has a dual function: on the one hand, the at least one filter part is used to form the discharge channel and / or the filter channel.Secondly, the at least one filter part is used to couple the housing part to the holding device and thus, while at least the partial area of ​​the housing part is provided with the coating, to advantageously position the housing part so that at least the partial area of ​​the housing part can be particularly advantageously provided with the coating. Since, for example, the at least one filter part is formed from sheet metal and thus has a sheet metal construction, the holding element can, for example, be provided on the at least one filter part in a particularly simple, time-saving and cost-effective manner. In particular, the holding element can, for example, be provided on the at least one filter part by a geometric adaptation of a construction, in particular the sheet metal construction, of the at least one filter part.When reference is made above and below to the filter part, unless otherwise stated, this refers to at least one filter part in which the retaining element (first retaining element) is provided. For example, the housing part is a cover of the housing of the electrical energy storage device.

[0016] The invention is based in particular on the following considerations and findings: in particular during operation of the motor vehicle, an entire outer side of the electrical energy storage device facing away from the receiving space and facing the surroundings of the electrical energy storage device in the fully manufactured state of the electrical energy storage device is exposed to corrosive media and is therefore exposed to a high risk of corrosion, in particular because the electrical energy storage device in the fully manufactured state of the motor vehicle having the electrical energy storage device is arranged in or on an underbody of a body of the motor vehicle.In order to prevent excessive corrosion, the outer side of the housing part is at least partially, in particular at least predominantly and thus at least more than half or completely covered with the coating, which in the fully manufactured state forms at least part of the entire outer side. In this case, a high quality of the coating, also referred to as coating quality, is desirable in order to be able to sufficiently low the risk of corrosion of the housing part. Such a high coating quality can now be achieved because any misalignment of the coating that may develop forms at the aforementioned contact point between the holding device and the holding element, and this defect is arranged in the receiving space in the fully manufactured state of the energy storage device.Since the housing is sealed, the probability or risk of corrosion occurring at the defect can be kept particularly low, so that a particularly low risk of corrosion can be realized for the energy storage device.

[0017] In order to advantageously provide and thus coat at least the partial area of ​​the housing part, one embodiment of the invention provides for the holding element to be formed integrally with the at least one filter part. In other words, it is preferable for the holding element and the at least one filter part to be formed from a single piece and thus integrally with one another. This means that it is preferably provided that the at least one filter part and the holding element are not formed separately from one another and connected to one another, but rather the at least one filter part and the holding element are preferably formed by a one-piece body, thus formed from a single piece, which is manufactured in one piece and thus integrally and thus formed as a monoblock.

[0018] Preferably, the partial region of the housing part is at least a partial region of an outer side of the housing part, the outer side of which, in the fully manufactured state of the electrical energy storage device, faces away from the receiving space and toward the aforementioned surroundings of the energy storage device. Thus, for example, in the fully manufactured state of the housing part, in particular of the electrical energy storage device, the coating forms an overall surface of the housing part, also referred to as an outer skin, whose outer skin is visually and haptically perceptible, for example, by a person located in the surroundings of the housing part, in particular of the electrical energy storage device, in the fully manufactured state of the electrical energy storage device.

[0019] A further embodiment is characterized in that the retaining element is formed separately from the filter parts and is connected, in particular directly, to the at least one filter part. This allows the retaining element to be provided on the at least one filter part in a time- and cost-effective manner, so that at least the partial area of ​​the housing part can be advantageously coated.

[0020] In order to be able to advantageously hold the housing part by means of the holding device, so that the housing part can be provided with the coating in a particularly time- and cost-effective manner, it is provided in a further embodiment of the invention that the holding element is coupled to the holding device in such a way that a hook of the holding device, which is formed separately from the holding element, is hooked into a receptacle which is at least partially delimited by the holding element, in particular directly.

[0021] A further embodiment is characterized in that, in order to provide at least the partial region of the housing part with the coating, the housing part - while the housing part is coupled to the holding device via the holding element - is at least partially immersed in a vertical direction by means of the holding device into an immersion bath. In particular, at least the partial region of the housing part is immersed in the immersion bath. The immersion bath is formed by a preferably liquid immersion medium. By immersing at least the partial region in the immersion bath, at least the partial region is wetted with the immersion medium, whereby the coating is formed from the immersion medium at least in the partial region. As a result, at least the partial region of the housing part can be provided with the coating in a particularly simple, time- and cost-effective manner.

[0022] In a further, particularly advantageous embodiment of the invention, it is provided that at least one second holding element is provided on the inside of the at least one filter part or on the other filter part of the filter device, which second holding element is provided in addition to the holding element and which, after the housing part has been provided with the coating, is coupled to the holding device or to a second holding device formed separately from the housing part and provided in addition to the holding device.

[0023] By coupling the second holding device to the second holding element, in particular non-destructively, the housing part is coupled, in particular exclusively, via the second holding element to the first holding device or the second holding device, in particular in a non-destructively releasable manner. The housing part is coupled to the first holding device or the second holding device via the second holding element, while at least the partial region and / or at least a second partial region of the housing part is provided with a second coating that differs from the first coating.

[0024] The previous and following statements regarding the first holding device, the first holding element, the first partial area and the first coating can also be readily applied to the second holding device, the second holding element, the second partial area and the second coating and vice versa.

[0025] Furthermore, it is conceivable that the housing part also has on its inside at least one second filter device which delimits at least one second discharge channel and at least one second filter channel, which second filter device has a third filter part with at least one third flow opening which opens at one end into the second discharge channel and at the other end into the second filter channel, and a fourth filter part which is formed separately from the third filter part, connected to the third filter part and spaced from the third filter part to form the second filter channel which runs between the third filter part and the fourth filter part and is thereby delimited by the third filter part and the fourth filter part, and at least one second filter device which opens at one end into the filter channel and at the other end into the receiving space when the energy storage device is fully manufactured,a fourth through-flow opening arranged offset from the third through-flow opening and through which the gas flowing out of the storage element and / or flowing out of a further storage element of the energy storage device, flowing into the receiving space and containing particles can flow, via which the gas can be introduced into the second filter channel, by means of which the gas can be guided to the third through-flow opening through which the gas can flow, via which the gas can be introduced into the second discharge channel arranged downstream of the second filter channel in the flow direction of the gas, whereby the particles contained in the gas can be at least partially filtered out of the gas by means of the second filter device.

[0026] The previous and following statements regarding the first filter device and its filter parts can be readily applied to the second filter device and its filter parts, and vice versa. For example, provision is made for at least one further holding element to be provided on the inside of the third filter part and / or the filter part, in addition to the first holding element, which further holding element is also provided, for example, in addition to the second holding element. After the housing part has been provided with the coating, the further holding element is coupled to the first holding device and thus to the second holding device, in particular in a non-destructive manner, whereby the housing part is coupled to the first or second holding device via the further holding element, in particular in a non-destructive manner.In this case, for example, the housing part is coupled to the first or second holding device via the further holding element, while at least the first partial area and / or at least the second partial area of ​​the housing part are provided with the second coating which is different from the first coating.

[0027] It is preferably provided that, while the housing part is provided with the second coating, a coupling of the housing part via the first holding element is omitted. Furthermore, it is preferably provided that, while the housing part is provided with the first coating, a coupling of the housing part via the second holding element and / or the further holding element to the holding device is omitted. Thus, for example, when the housing part is provided with the first coating, the second holding element and / or the further holding element is provided with the first coating, and thus coated. If the housing part is subsequently coated with the second coating, for example, the aforementioned defect in the first coating is provided with the second coating.Since, for example, the second holding element and / or the further holding element directly contacts the holding device while the housing part is provided with the second coating, a defect in the second coating can arise, for example, at a contact point at which the holding device directly contacts the second holding element and / or the further holding element, since the contact point or the defect is not provided with the second coating. However, the contact point is preferably already provided with the first coating. As a result, for example, a point can be avoided which is free of both the first coating and the second coating, so that the risk of corrosion of the housing part can be kept to a particularly low level.

[0028] In order to be able to provide the housing part with the second coating in a particularly advantageous manner, one embodiment of the invention provides that the second holding element is formed integrally with the at least one filter part or the other filter part.

[0029] It has also been found to be particularly advantageous if the second holding element is formed separately from the filter parts and is connected to the at least one filter part and the other filter part.

[0030] Finally, it has proven particularly advantageous if, in order to provide at least the first partial region and / or the second partial region of the housing part with the second coating, the housing part—while the housing part is coupled to the first holding device or the second holding device via the second holding element—is immersed at least partially in the vertical direction by means of the first holding device or the second holding device into a second immersion bath that is different from the first immersion bath. The second immersion bath is formed, for example, by a second immersion medium that is different from the first immersion medium.By immersing the housing part, in particular the first sub-region and / or the second sub-region, into the second immersion bath and thus into the second immersion medium, the first sub-region and / or the second sub-region is wetted with the second immersion medium, whereby the second coating is formed in the first sub-region and / or in the second sub-region from the second immersion medium. This allows the housing part to be provided with the second coating in a particularly time- and cost-effective manner.

[0031] Further advantages, features, and details of the invention will become apparent from the following description of a preferred embodiment and from the drawings. The features and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respective combinations specified, but also in other combinations or on their own, without departing from the scope of the invention.

[0032] The drawing shows: Fig. 1 shows a partial schematic perspective view of a first embodiment of a housing part for a housing of an electrical energy storage device of a motor vehicle; Fig. 2 shows a further schematic perspective view of the housing part according to the first embodiment; Fig. 3 shows a partial schematic perspective view of a second embodiment of the housing part; Fig. 4 shows a further schematic perspective view of the housing part according to the second embodiment; and Fig. 5 a schematic perspective view of the housing part according to the second embodiment.

[0033] In the figures, identical or functionally identical elements are provided with the same reference symbols.

[0034] Fig. 1 and Fig. 2 each show, in detail, in a schematic perspective view, a first embodiment of a housing part 10 for a housing of an electrical energy storage device of a motor vehicle, designed for the storage, in particular electrochemical storage, of electrical energy. This means that the motor vehicle, also simply referred to as a vehicle and preferably designed as a motor vehicle, in particular as a passenger car, has the energy storage device in its fully manufactured state. The electrical energy storage device is a high-voltage component whose electrical voltage, in particular electrical operating or nominal voltage, is preferably greater than 50 volts (V), in particular greater than 60 V, and very preferably amounts to several hundred volts (V). In its fully manufactured state, the electrical energy storage device has the aforementioned housing and thus the housing part 10, in particular as the first housing part.The housing and thus the electrical energy store also have a second housing part, not shown in the figures. The housing parts are formed separately from one another and connected to one another. In the fully manufactured state of the electrical energy store comprising the housing and thus the housing parts, a receiving space of the electrical energy store, also referred to as a receiving area, is delimited, in particular directly, by the housing. The receiving space is thus partially and directly delimited by the first housing part 10 and partially and directly by the second housing part. Furthermore, in its fully manufactured state, the electrical energy store has a plurality of storage elements formed separately from one another and separately from the housing, by means of which the electrical energy is to be stored or is stored, in particular electrochemically. Very particularly, the storage elements are storage cells.Preferably, the storage elements are electrically connected to one another. When the electrical energy storage device is fully manufactured, the storage elements are arranged in the receiving space and thus in the housing.

[0035] In Fig. 1 and Fig. 2 shows an inner side 12 of the first housing part 10. In the fully manufactured state of the electrical energy storage device, the inner side 12 of the housing part 10 faces the receiving space, wherein, for example, the receiving space is partially and directly delimited by the inner side 12.

[0036] Out of Fig. 1 and Fig. 2 it can be seen that the housing part 10 has, on its inner side 12 facing the receiving space for the storage elements in the fully manufactured state of the electrical energy storage device, at least one filter device 14 delimiting at least one discharge channel and at least one filter channel, as disclosed and described in detail in DE 10 2021 000 684 A1.The filter device 14 has a first filter part with at least one first flow opening, one end of which opens into the discharge channel and the other end into the filter channel, and a second filter part 16, which is formed separately from the first filter part, is connected to the first filter part and is spaced from the first filter part to form the filter channel running between the filter parts and thereby delimited by the filter parts, in particular directly, and has at least one second flow opening, one end of which opens into the filter channel and, in the fully manufactured state of the electrical energy storage device, the other end into the receiving space, is arranged offset from the first flow opening and can be flowed through by a gas flowing out of at least one of the storage elements and flowing into the receiving space and containing particles.

[0037] Out of Fig. 1 and Fig. 2 that the housing part 10 is at least substantially bowl-shaped or trough-shaped and thereby defines, in particular directly defines, a receiving area 18. In the fully manufactured state of the electrical energy storage device, the receiving area 18 is part of the receiving space. With regard to the second flow opening, this means that when considering the housing part 10 alone, the second flow opening opens into the filter channel at one end and into the receiving area 18 at the other. The gas can be introduced into the filter channel via the second flow opening, by means of which the gas can be guided to the first flow opening through which the gas can flow, and via which the gas can be introduced into the discharge channel arranged downstream of the filter channel in the direction of gas flow. As a result, the particles contained in the gas can be at least partially filtered out of the gas by means of the filter device.

[0038] In the following, a method for providing at least a first partial area of ​​the housing part 10 with a coating is described. In order to be able to provide at least the first partial area of ​​the housing part 10 with the first coating, also referred to as the first coating, a respective Fig. 1, a respective holding element 20 is provided on the inner side 12 at the location of the filter part 16 designated S. In the method, the holding element 20, which is also referred to as the first holding element, is coupled separately from the filter device 14 and also separately from the holding device formed by the holding element 20, whereby the housing part 10 is coupled to the holding device via the holding element 20. In the method, the housing part 10 is coupled to the holding device via the first holding element 20, in particular in a non-destructively detachable manner, while at least the first partial region of the housing part 10 is provided with the coating.

[0039] At the Fig. 1 and Fig. In the first embodiment of the housing part 10 shown in Figure 2, the first holding element 20 is formed integrally with the filter part 16. In addition, the holding element 20 has a first opening 22, designed for example as a first through-opening, which is completely circumferential along its circumferential direction and is directly delimited by the holding element 20. The holding element 20 is coupled to the holding device, in particular non-destructively and releasably, in such a way that a hook of the holding device is hooked into the opening 22 and thus into the holding element 20. The opening 22 is thus a receptacle of the holding element 20, into whose receptacle the hook is hooked. As a result, the holding device is coupled, in particular non-destructively and releasably, to the holding element 20 and via this to the housing part 10.In the first embodiment, the filter part 16 is made of sheet metal and thus designed as a sheet metal part, so that the filter part 16 has a sheet metal construction. The retaining element 20 can be implemented particularly easily through or on this sheet metal construction.

[0040] The first coating, for example, is a zinc-nickel coating (Zn-Ni coating).

[0041] Furthermore, a second holding element 24 is provided on the filter part 16, which is arranged on the inner side 12 and is provided in addition to the first holding element 20 and, in the first embodiment, is formed integrally with the filter part 16. The holding elements 20 and 24 are formed integrally with one another, thus made from a single piece. The second holding element 24 can also be formed or realized particularly easily by or on the sheet metal construction of the filter part 16. For example, while at least the first partial area of ​​the housing part 10 is provided with the first coating, and while the housing part 10 is coupled to the holding device via the holding element 20, i.e. the opening 22, there is no coupling of the housing part 10 to the holding device via the holding element 24. After providing the housing part 10, i.e.of the first partial area with the first coating, the second holding element 24 is coupled to the holding device or to a second holding device formed separately from the housing part 10 and separately from the first holding device, in particular in a non-destructively releasable manner, whereby the housing part 10 is coupled via the second holding element 24 to the first holding device or the second holding device, in particular in a non-destructively releasable manner. For this purpose, the second holding element 24 has a second opening 26, designed, for example, as a second through-opening. For example, after the first partial area has been provided with the first coating, the second holding element 24 is coupled to the first or second holding device in such a way that the hook of the first holding device or a second hook of the second holding element 24, formed separately from the filter part 16, is hooked into the second opening 26 and thus the holding element 24.The housing part 10 is coupled to the first or second holding device via the second holding element 24, while at least the first partial area and / or at least a second partial area of ​​the housing part 10 is provided with a second coating that is different from the first coating. While the housing part 10, i.e. the first partial area and / or the second partial area, is provided with the second coating and while the housing part 10 is coupled to the first or second holding device via the second holding element 24, the housing part 10 is not coupled to the first or second holding device via the holding element 20. Thus, for example, the second holding element 24 is provided with the first coating and the first holding element 20 is provided with the second coating, so that it can be avoided that the respective holding element 20, 22 remains free of both the first coating and the second coating.

[0042] The second coating is, for example, a KTL coating (KTL - cathodic dip painting). In the first embodiment, both the respective first holding element 20 and the respective second holding element 24 are provided at the respective location S.

[0043] In the first embodiment, for example, the respective opening 22, 26 is used as a respective hook receptacle into which the respective hook is hooked in order to thereby detachably couple the housing part 10 to the respective holding device in a non-destructive manner.

[0044] Out of Fig. 1 shows that the filter device 14 is provided on a first side S1 of the housing part 10. For example, a second filter device is provided on a second side of the housing part 10 opposite the side S1, wherein the previous and following statements regarding the first filter device 14 can be readily applied to the second filter device and vice versa.

[0045] In the present case, two holding elements 20 and 24 are provided at exactly four locations S of the filter part 16, although, of course, more or fewer holding elements and consequently receptacles or openings 22, 26 can be provided.

[0046] Fig. 3 to 5 show a second embodiment of the housing part 10. Fig. 5 shows that, for example, the respective first holding element 20 is provided precisely at respective first locations ST1 of the filter part 16. The respective second holding element 24 is provided at respective second locations ST2 of the filter part 16. It is conceivable that the respective first holding element 20 and the respective second holding element 24 are identical, ie, of identical construction.

[0047] Looks particularly good Fig. 3 shows the respective first holding element 20 according to the second embodiment. Fig. 3 it can be seen that in the second embodiment, a receptacle 28 is at least partially and preferably directly delimited by the holding element 20. The present and following explanations regarding the holding element 20 according to the second embodiment can be readily transferred to the second holding element 24 according to the second embodiment and vice versa. Like the respective opening 22, 26 of the respective holding element 20, 24 according to the first embodiment, for example, the respective receptacle 28 of the respective holding element 20, 24 according to the second embodiment is used as a receptacle, in particular a hook receptacle, in order to couple the first or second holding device, in particular in a non-destructively detachable manner, to the respective holding element 20, 24 according to the second embodiment. As in Fig.4 shows, by way of example and schematically, the hook of the first holding device, designated 30. The previous and following explanations regarding the hook 30 of the first holding device can readily be applied to the hook of the second holding device, and vice versa. The respective hook 30 is hooked into the respective receptacle 28 of the respective holding element 20, 24 according to the second embodiment, whereby the first or second holding device is detachably coupled to the housing part 10 in a non-destructive manner. In the second embodiment, it is also possible for the respective second holding element 24 to be provided with the first coating and the respective first holding element 20 with the second coating, whereby the risk of corrosion of the housing part 10 can be kept to a particularly low level.

[0048] In order to provide at least the first partial area with the first coating, the housing part 10, which is coupled to the first holding device and is designed, for example, as a cover, is immersed perpendicularly, i.e. in the vertical direction, into a first immersion bath, also referred to as the first coating bath, by means of the first holding device. The first immersion bath is formed by a first immersion medium, which is preferably a liquid. By immersing the housing part 10 in the first immersion bath and at least the first partial area is wetted with the first immersion medium, whereby the first coating is formed from the first immersion medium at least in the first partial area.After providing the first partial area with the first coating, the housing part 10, for example, while coupled to the second holding device, is immersed vertically by means of the second holding device into a second dipping bath, also referred to as a second coating bath, in order to provide the first partial area and / or a second partial area with the second coating. The second dipping bath is formed by a second dipping medium that is different from the first dipping medium. By immersing the housing part 10 in the second dipping bath that is different from the first dipping bath, the first partial area and / or the second partial area is wetted with the second dipping medium, whereby the second coating is formed in the first and / or second partial area from the second dipping medium. This ensures that each holding element 20 and 24 is coated once, i.e. is provided with one of the coatings.

[0049] The respective holding device is, for example, a coating frame by means of which the housing part 10 is advantageously held and / or moved in order to advantageously provide the respective partial area with the respective coating.

[0050] The features mentioned herein with respect to a method for providing at least one housing part for an electrical energy storage device designed to store electrical energy with at least one coating and their advantages can also relate to at least one housing part of an electrical energy storage device described herein and vice versa. List of reference symbols 10 Housing part 12 Inside 14 Filter device 16 first filter part 18 Recording area 20 first holding element 22 first opening 24 second holding element 26 second opening 28 recording 30 hooks S position S1 page ST1 first position ST2 second place

Claims

[1] Method for providing a housing part (10) for an electrical energy storage device designed to store electrical energy with at least one coating, in which: - the housing part (10) has, on its inner side (12) facing a receiving space for at least one storage element of the energy storage device provided for storing the electrical energy, at least one filter device (14) which, in the fully manufactured state of the energy storage device, delimits at least one discharge channel and at least one filter channel, which filter device has a first filter part (16) with at least one first flow opening opening at one end into the discharge channel and the other end into the filter channel, and a second filter part which is formed separately from the first filter part (16), is connected to the first filter part (16) and is spaced from the first filter part (16) to form the filter channel running between the filter parts and thereby delimited by the filter parts, and at least one filter device opening at one end into the filter channel and, in the fully manufactured state of the energy storage device, at the other end into the receiving space,a second through-flow opening arranged offset from the first through-flow opening and through which a gas flowing out of the storage element and flowing into the receiving space and containing particles flows, via which second through-flow opening the gas can be introduced into the filter channel, by means of which the gas can be guided to the first through-flow opening through which the gas can flow, via which the gas can be introduced into the discharge channel arranged downstream of the filter channel in the flow direction of the gas, whereby the particles contained in the gas can be at least partially filtered out of the gas by means of the filter device (14); - at least one holding element (20) arranged on the inner side (12) is provided on at least the first filter part (16) or the second filter part, which holding element is coupled to a holding device formed separately from the housing part (10), whereby the housing part (10) is coupled to the holding device via the holding element (20); and - the housing part (10) is coupled to the holding device via the holding element (20), while at least a partial area of ​​the housing part (10) is provided with the coating. [2] Method according to claim 1, characterized by that the holding element (20) is formed integrally with the first filter part (16) or the second filter part. [3] Method according to claim 1, characterized by that the holding element (20) is formed separately from the filter parts and is connected to the first filter part (16) or the second filter part. [4] Method according to one of the preceding claims, characterized by that the holding element (20) is coupled to the holding device in such a way that a hook (30) of the holding device, which is formed separately from the holding element (20), is hooked into a receptacle (22, 28) which is at least partially delimited by the holding element (20). [5] Method according to one of the preceding claims, characterized byin that, in order to provide at least the partial area of ​​the housing part (10) with the coating, the housing part (10) - while the housing part (10) is coupled to the holding device via the holding element (20) - is at least partially immersed in a dipping bath in the vertical direction by means of the holding device. [6] Method according to one of the preceding claims, characterized by , that: - at least one second holding element (24) is provided on the first filter part (16) or the second filter part, which second holding element (24) is arranged on the inner side (12) and is provided in addition to the holding element (20), which second holding element (24) is coupled, after the housing part (10) has been provided with the coating, to the holding device or to a second holding device formed separately from the housing part (10) and provided in addition to the holding device, whereby the housing part (10) is coupled to the first holding device or the second holding device via the second holding element (24); and - the housing part (10) is coupled to the first holding device or the second holding device via the second holding element (24), while at least the partial region and / or at least a second partial region of the housing part (10) is provided with a second coating different from the first coating. [7] Method according to claim 6, characterized bythat the second holding element (24) is formed integrally with the first filter part (16) or the second filter part. [8] Method according to claim 6, characterized by that the second holding element (24) is formed separately from the filter parts and is connected to the first filter part (16) or the second filter part. [9] Method according to one of claims 6 to 8 in its dependence on claim 5, characterized by in that, in order to provide at least the first partial area and / or the second partial area of ​​the housing part (10) with the second coating, the housing part (10) - while the housing part (10) is coupled to the first holding device or the second holding device via the second holding element (24) - is immersed at least partially in the vertical direction into a second immersion bath which is different from the first immersion bath by means of the first holding device or the second holding device.

Images