Battery cell assembly for an electric energy storage device of a motor vehicle which is at least partially electrically powered, method for producing a battery cell assembly, and method for disassembling a battery cell assembly

Abstract

The invention relates to a battery cell assembly (10) for an electric energy storage device of a motor vehicle which is at least partially electrically powered, wherein the battery cell assembly (10) has at least one battery cell (12) with a battery cell housing (14) and at least one module housing (16). The battery cell housing (14) is fixed in a gap (18) on the module housing (16) using a first adhesive (20), and a hollow channel (22) is additionally arranged in the gap (18) between the module housing (16) and the battery cell housing (14). The invention additionally also relates to a method for producing a battery cell assembly (10) and to a method for disassembling a battery cell assembly (10).

Description

[0001] Mercedes-Benz Group AG

[0002] Battery cell arrangement for an electrical energy storage device of an at least partially electrically operated motor vehicle, method for producing a battery cell arrangement and method for dismantling a battery cell arrangement

[0003] The invention relates to a battery cell arrangement for an electrical energy storage device of an at least partially electrically operated motor vehicle according to the preamble of patent claim 1. Furthermore, the invention relates to a method for producing such a battery cell arrangement and a method for dismantling such a battery cell arrangement.

[0004] It is already known from the prior art that battery cells can be combined with a corresponding battery housing to form a battery module, which can in particular have a large number of battery cells. In particular, the individual battery cells are fixed to a module housing. For this purpose, an appropriate adhesive can be used, for example, which enables the battery cells to be fixed to the module wall or the module housing. If, for example, the module needs to be disassembled or reworked, the battery cell must be removed. In this case, an appropriate adhesive between the battery cell and the module housing must be removed accordingly. In particular, if the battery cell is active, for example, heat-intensive disassembly work, such as machining assembly work, cannot be used.

[0005] DE 102021 002 651 A1 relates to an electrical component comprising a housing, wherein the housing comprises a housing base and a housing cover which is fastened and sealed to the housing base with an adhesive or a liquid sealant, wherein a tear strip is inserted into the adhesive or the liquid sealant, which tear strip has a pull tab with which the adhesive or the liquid sealant can be broken open, wherein the tear strip is designed as a wire which has a diameter of 0.01 mm to 10 mm and is inserted into or behind the adhesive or the liquid sealant, wherein the pull tab is designed as at least one protruding end of the wire.

[0006] DE 102021 002 803 A1 relates to a battery assembly for a motor vehicle, comprising a battery housing and at least one cell module arranged on a base plate of the battery housing. The at least one cell module comprises a cell module housing and a plurality of battery cells arranged in the cell module housing. A base of the cell module housing is connected to the base plate of the battery housing by means of an adhesive. The cell module housing is connected to a side wall of the battery housing by means of a further adhesive. The further adhesive has a higher shear strength than the adhesive arranged between the base of the cell module housing and the base plate of the battery housing.

[0007] DE 102022 114 782 A1 relates to an electrical energy storage device for a vehicle with a number of electrically interconnected individual cells which are fixed in a housing by means of adhesive bonding, wherein an adhesive for bonding is introduced into the housing and into the spaces between adjacent individual cells to a predetermined extent. It is provided that cylindrical cavities arranged parallel to the longitudinal axis of the individual cells are formed in the adhesive at predetermined positions and / or a channel system is arranged in the housing with at least one inlet opening arranged on the outside of the housing and fluidically coupled to the channel system, wherein at least one respective channel branch arranged parallel to the longitudinal axis of the individual cells has at least one outlet opening opening into the adhesive.

[0008] The object of the present invention is to provide a battery assembly, a method for producing a battery assembly and a method for disassembling a battery assembly, by means of which disassembly of a battery assembly can be carried out in an improved manner.

[0009] This object is achieved by a battery arrangement, a method for producing a battery arrangement and a method for disassembling a battery arrangement according to the independent patent claims. Advantageous embodiments are specified in the subclaims. One aspect of the invention relates to a battery cell arrangement for an electrical energy storage device of an at least partially electrically operated motor vehicle, wherein the battery cell arrangement has at least one battery cell with a battery cell housing and at least one module housing, wherein the battery cell housing is fixed to the module housing in a gap by means of a first adhesive. It is provided that a hollow channel is additionally arranged in the gap between the module housing and the battery cell housing.

[0010] In particular, the invention therefore deals with the fact that, for example, when a cell block is disassembled for rework, this cell block must be detached from the adhesive. The first adhesive must be actively separated because it must fail purely cohesively. With the active cell block in close proximity, a cutting cord is ideal for this purpose. Machining processes, such as milling or sawing, are disadvantageous due to component contamination from chips and the risk of cutting into a sharp cell block. Furthermore, temperature build-up can occur during this process due to the lack of cooling. The adhesive forms hydrogen cyanide in the process, and exposure to temperature is also not permitted. Cutting is also not possible because the blade can become clogged with material during cutting and this can lead to heating.

[0011] For this purpose, a small tube in the shape of a hollow channel is inserted between the two housings. In the event of disassembly, a cutting cord is threaded into the channel, secured at one end, and the other end wound onto a winch, for example. The cutting cord is wound onto the winch with a defined force and speed, cutting through the fixing adhesive and thus separating the battery cell from the module housing. It must also be capable of allowing a second cutting cord to be threaded in if the first cutting cord breaks during disassembly.

[0012] Furthermore, the battery cell arrangement is provided with a flow barrier between the first adhesive and the second adhesive. This prevents the first adhesive from passing beneath the flow barrier, thus enabling improved subsequent separation of this adhesive.

[0013] According to an advantageous embodiment, the hollow channel is only partially surrounded by the first adhesive. In particular, the hollow channel is only surrounded by the adhesive on one side, so that the entire adhesive can be severed when the cutting cord is inserted into the hollow channel.

[0014] Furthermore, it has proven advantageous if the hollow channel is formed on a side wall of the module housing and a side wall of the battery cell housing. In particular, it can be provided, for example, that a further adhesive is formed on a battery cell base and on the module housing base. This adhesive is designed, for example, as a thermally conductive adhesive. However, it is only necessary that the first adhesive be cut through laterally.

[0015] A further advantageous embodiment provides that the hollow channel extends along the entire length of the battery cell. In particular, the hollow channel extends at least along the length where the adhesive is applied between the module housing and the battery cell housing, thus enabling accidental separation of the adhesive.

[0016] Furthermore, as already mentioned, it has proven advantageous to form a second adhesive as a thermally conductive adhesive between the underside of the module housing and the underside of the battery cell housing. In particular, this second adhesive is essentially so strong that it can fail adhesively. The thermally conductive adhesive can, in particular, transfer heat from the battery cell to the module housing via the thermally conductive adhesive.

[0017] In particular, it can be provided that the flow barrier is formed by the hollow channel itself. In particular, the hollow channel can be "squeezed" during insertion, so that the hollow channel forms the flow barrier and thus prevents the adhesive from flowing toward the thermally conductive adhesive. This allows the hollow channel to be used in highly functional ways.

[0018] A further advantageous embodiment provides that a minimum distance of 3 mm is formed between the battery cell housing and the module housing. In particular, the hollow channel therefore also has a diameter of substantially 3 mm, for example. This makes it possible, for example, for a 1 mm cutting cord to be introduced into the hollow channel, wherein the adhesive can be reliably severed by means of a cutting cord of at least 1 mm. A further aspect of the invention relates to a method for producing a battery cell arrangement according to the preceding aspect. A battery cell with a battery cell housing and a module housing is provided. The battery cell is arranged on the module housing.The hollow channel is introduced into a gap between the module housing and the battery cell housing, and the battery cell housing is fixed to the module housing by introducing an adhesive into the gap, particularly in such a way that the hollow channel is at least partially enclosed. The steps presented are particularly carried out in a chronological order.

[0019] Furthermore, the invention also relates to a method for dismantling a battery cell arrangement according to the preceding aspect, in which a cutting cord is introduced into the hollow channel and in which the hollow channel is destroyed at least in regions by pulling on the cutting cord, wherein the first adhesive is severed by the cutting cord, so that dismantling of the battery cell from the module housing is possible.

[0020] Further advantages, features, and details of the invention will become apparent from the following description of preferred embodiments 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 specified combinations, but also in other combinations or on their own, without departing from the scope of the invention.

[0021] Showing:

[0022] Fig. 1 is a schematic sectional view according to an embodiment of a battery arrangement;

[0023] Fig. 2 is a further schematic sectional view of an embodiment of a battery arrangement according to Fig. 1; and

[0024] Fig. 3 shows a further schematic sectional view according to an embodiment of a battery assembly. In the figures, identical or functionally equivalent elements are provided with the same reference numerals.

[0025] Fig. 1 shows a schematic sectional view of an embodiment of a battery cell arrangement 10. The battery cell arrangement 10 has at least one battery cell 12 with a battery cell housing 14. Furthermore, the battery cell arrangement 10 has at least one module housing 16. In particular, the module housing 16 is trough-shaped in the present case, with the battery cell 10 being arranged at least partially in the trough of the module housing 16. A gap 18 is formed between the battery cell housing 14 and the module housing 16. In turn, an adhesive 20 is formed in the gap 18, which fixes the battery cell housing 14 to the module housing 16.

[0026] Fig. 1 shows, in particular, that a hollow channel 22 is additionally formed in the gap 18 between the module housing 16 and the battery cell housing 14. Furthermore, the figure shows that the hollow channel 22 is formed, in particular, on a side wall of the module housing 24 and a side wall 26 of the battery cell housing 14. Provision can be made for the hollow channel 22 to extend along the entire length of the battery cell 12. Furthermore, it is shown that the hollow channel 22 is only partially surrounded by the adhesive 20.

[0027] Fig. 1 further shows that a second adhesive 32 is formed as a thermally conductive adhesive between an underside 28 of the module housing 16 and an underside 30 of the battery cell housing 14. Furthermore, Fig. 1 shows that the battery cell arrangement 10 has a flow barrier 34 between the first adhesive 20 and the second adhesive 32. In particular, a minimum distance of 3 mm is formed between the battery cell housing 14 and the module housing 16.

[0028] Fig. 1 further shows in particular a method for producing the battery cell arrangement 10, wherein at least the battery cell 12 with the battery cell housing 14 and the module housing 16 are provided. The battery cell 12 is arranged on the module housing 16, in particular in the trough of the module housing 16. The hollow channel 22 is then introduced into the gap 18 between the module housing 16 and the battery cell housing 14 and the battery cell housing 14 is fixed to the module housing 16 by introducing the first adhesive 20 into the gap 18. Fig. 2 shows a further schematic sectional view according to an embodiment of the battery cell arrangement 10 according to Fig. 1. In the following exemplary embodiment, it is shown in particular that a cutting cord 36 is introduced into the hollow channel 22.Thus, the battery assembly 10 can be disassembled by inserting the cutting cord 36 into the hollow channel 22 and, by pulling on the cutting cord 36, destroying the hollow channel 22 at least in part, wherein the first adhesive 20 is also severed by the cutting cord 36, so that disassembly of the battery cell 12 from the module housing 16 is possible.

[0029] Thus, particularly during disassembly, the cutting cord 36 can be threaded into the hollow channel 22, secured at one end, and the other end wound onto a winch. The cutting cord 36 is wound onto the winch with a defined force and speed, cutting through the first adhesive 20 and thus separating the cell block from the housing. Furthermore, the disclosed feature allows a second cutting cord to be rethreaded should the cutting cord 36 break during disassembly. As shown, the hollow channel 22 is encapsulated with the first adhesive 20, which is particularly designed as a fixing adhesive. This also enables the fixing adhesive to be separated directly. The design is independent of the geometry of the cell block. The hollow channel 22 can also be implemented on the cell block, although this usually creates a deflection of the cutting cord 36. This can make it more likely that it will break when the winch is wound up.

[0030] The hollow channel 22, which is particularly designed as a small tube, is sealed with the fixing adhesive. The flow barrier 34 prevents the fixing adhesive from flowing under the battery cell 12.

[0031] Fig. 3 shows a further schematic sectional view according to an embodiment of the battery cell arrangement 10. In the following exemplary embodiment, it is shown in particular that the hollow channel 22 itself can also be used as a flow barrier 34. It can be seen in particular that the hollow channel 22 can be squeezed in a defined manner and thus serves as a flow barrier 34. This has the particular advantages of saving costs, since a separate flow barrier 34 can be omitted, and also saving installation space, since the space of the flow barrier 34 can be used for the hollow channel 22 itself.

Claims

Mercedes-Benz Group AG Patent claims 1. Battery cell arrangement (10) for an electrical energy storage device of an at least partially electrically operated motor vehicle, wherein the battery cell arrangement (10) has at least one battery cell (12) with a battery cell housing (14) and at least one module housing (16), wherein the battery cell housing (14) is fixed to the module housing (16) in a gap (18) by means of a first adhesive (20), wherein a hollow channel (22) is additionally arranged in the gap (18) between the module housing (16) and the battery cell housing (14), characterized in that the battery cell arrangement (10) has a flow barrier (34) between the first adhesive (20) and the second adhesive (32).

2. Battery cell arrangement (10) according to claim 1, characterized in that the hollow channel (22) is surrounded by the first adhesive (20) only in regions.

3. Battery cell arrangement (10) according to claim 1 or 2, characterized in that the hollow channel (22) is formed on a side wall (24) of the module housing (16) and a side wall (26) of the battery cell housing (14).

4. Battery cell arrangement (10) according to one of the preceding claims, characterized in that the hollow channel (22) extends along an entire length of the battery cell (12). Battery cell arrangement (10) according to one of the preceding claims, characterized in that a second adhesive (32) is formed as a thermally conductive adhesive between an underside (28) of the module housing (16) and an underside (30) of the battery cell housing (14). Battery cell arrangement (10) according to one of the preceding claims, characterized in that the flow barrier (34) is formed by the hollow channel (22). Battery cell arrangement (10) according to one of the preceding claims, characterized in that a minimum distance of 3 mm is formed between the battery cell housing (14) and the module housing (16). Method for producing a battery cell arrangement (10) according to one of claims 1 to 7, comprising the steps: - Providing a battery cell (12) with a battery cell housing (14) and a module housing (16); - arranging the battery cell (12) on the module housing (16); - introducing a hollow channel (22) into a gap (18) between the module housing (16) and the battery cell housing (14); and - Fixing the battery cell housing (14) to the module housing (16) by introducing a first adhesive (20) into the gap (18). A method for disassembling a battery cell arrangement (10) according to one of claims 1 to 7, wherein a cutting cord (36) is introduced into the hollow channel (22), and wherein the hollow channel (22) is destroyed at least in regions by pulling on the cutting cord (36), wherein the first adhesive (20) is severed by the cutting cord (36), thus enabling disassembly of the battery cell (12) from the module housing (16).

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