Activated carbon cartridge, compensation tank and battery cooling system

Abstract

The invention relates to an activated carbon cartridge (12) for a compensation tank (1) for a battery cooling system (3), - having a cartridge housing (15) with a pot (17) and a lid (18), wherein a pot bottom (25) of the pot (17) and the lid (18) are designed to be air-permeable and are in particular covered on the inside with a fabric or non-woven fabric (19), - activated carbon (24) is arranged in the cartridge housing (15), - having a seal (23) arranged on the pot bottom (25) for sealing against an intermediate wall (13) of a tank housing (4) of the compensation tank (1), - having a spring (14) which is supported on the lid (18). This allows for an easy-to-install and space-optimized design. Figure for abstract: Fig. 4

Description

Title of the invention: Activated carbon cartridge, compensation tank and battery cooling system

[0001] The present invention relates to an activated carbon cartridge for a compensation tank for a battery cooling system. The invention also relates to a compensation tank comprising such an activated carbon cartridge and a battery cooling system comprising such a compensation tank.

[0002] Electric or hybrid vehicles are attracting more and more attention from consumers due to their environmental aspects and are consequently becoming more and more widespread on the roads. In order to be able to increase both the autonomy and the performance of these electric or hybrid vehicles, it is sought to maintain a traction battery of such an electric or hybrid vehicle within an optimal temperature window for said traction battery, for which temperature regulation devices, in particular cooling devices, are used in a known manner.

[0003] Such a battery cooling system, for cooling in particular a traction battery, also comprises a compensation tank in which air is stored as a compensation cushion for a temperature-induced change in the volume of the coolant. An increase in temperature causes the coolant to expand, which, if a resulting overpressure cannot escape, could lead to a high pressure load in the compensation tank and possibly damage it, which must therefore be avoided. For this reason, compensation tanks of this type are generally connected to the environment in order to be able, if necessary, to reduce a temperature-induced pressure difference by expelling air into the environment.In order to prevent or at least reduce the unwanted emission of hydrocarbon compounds into the environment, activated carbon filters were previously provided, through which the air to be expelled into the environment passed and arranged separately from the compensation tank. When the coolant cools down, it contracts, which creates a negative pressure in the compensation tank and causes fresh air to be drawn in from the environment. In order to prevent or at least reduce the unwanted moisture entering the coolant, drying cartridges were previously provided, in which a drying agent was arranged, through which the fresh air drawn in from the environment passed during the suction process and thus absorbed the moisture and dried the drawn-in fresh air.

[0004] However, known activated carbon filters have the disadvantage of requiring a relatively large additional mounting space and of being difficult to mount.

[0005] The present invention therefore addresses the problem that requires, for an activated carbon filter intended for a compensation tank for a battery cooling system, an improved embodiment or at least an alternative embodiment, by means of which the known disadvantages of the prior art can be overcome.

[0006] The present invention is based on the general idea of ​​indicating for the first time an activated carbon cartridge which can be inserted extremely simply by form-fitting into a compensation tank of a battery cooling system. In order to be able to realize such a form-fitting connection, the activated carbon cartridge according to the invention for a compensation tank for a battery cooling system has a cartridge housing having a pot and a lid, wherein a pot bottom of the pot and the lid are designed to be permeable to air at least in certain areas and are in particular covered on the inside with a fabric or a non-woven fabric. The activated carbon is then arranged in the cartridge housing. The non-woven fabric prevents the activated carbon from escaping undesirably.Furthermore, a seal arranged on the pot bottom is provided for sealing against an intermediate wall of a tank housing of the compensation tank, said seal surrounding the air-permeable area on the pot bottom. A spring is also provided, which is supported on the cover. This not only allows the activated carbon cartridge to be arranged in the tank housing of the compensation tank in an optimal installation space, but also gives it fixed external dimensions by means of which it can be housed in a form-fitting manner in a complementary housing in the tank housing. The cartridge housing also allows the activated carbon cartridge to be replaced relatively simply by removing it from the tank housing and inserting a new activated carbon cartridge into the associated housing.The sealing gasket and spring also ensure that the activated carbon cartridge is clamped in the associated housing in the tank housing, thereby ensuring reliable fastening and sealing.

[0007] According to an advantageous improvement of the activated carbon cartridge according to the invention, the cover can slide in the pot in the manner of a piston. In addition, the activated carbon is arranged loose / as a bulk product in the cartridge housing. The spring, which bears on the one hand on the cover and on the other hand on the reservoir housing, allows in this case to pre-stress the fluid activated carbon, which prevents it from being crushed or worn during operation. Such an arrangement in bulk also allows maximum use of the interior space of the cartridge housing formed by the pot and the lid, and therefore to have as much activated carbon as possible, which makes it possible to achieve a high filtration degree or retention degree. The spring also allows for permanent tightening, which reduces wear on the activated carbon and thus helps maintain its filtration capacity in the long term.

[0008] In an alternative embodiment to the activated carbon cartridge according to the invention, the activated carbon is compressed into a honeycomb activated carbon monolith and can thus be used without a cartridge housing. Such an activated carbon monolith has the great advantage of being able to perform the separation function not only in a resource-saving manner, but also in a weight-optimizing manner. It is no longer necessary to fill and weigh the bulk activated carbon, which is expensive and generates dust, nor to use the cartridge housing.

[0009] In an alternative embodiment to the activated carbon cartridge, the activated carbon is arranged on / in a wound filter or a pleated filter, i.e. without the cartridge housing. The activated carbon is thus affixed to the wound filter or the pleated filter. Such an embodiment has the great advantage that it can retain not only hydrocarbons via the activated carbon and the wound filter or the pleated filter, but also other particles, such as dirt particles, depending on the design of the carrier material of the wound filter or the pleated filter.

[0010] Suitably, the cartridge housing is made of plastic. A design of both the pot and the lid made of plastic offers the advantage here that the cartridge housing can be adapted to different dimensions not only easily, but also extremely flexibly, in particular by adapting a plastic injection molding tool. Furthermore, the design of the cartridge housing made of plastic, in particular as a plastic injection molded part, also allows for low-cost manufacturing.

[0011] The present invention is further based on the general idea of ​​providing a compensation tank of a battery cooling system for compensating an air volume due to a temperature-dependent volume change of a coolant, in particular oil, comprising a two-shell tank housing having a second housing in which the activated carbon cartridge or a honeycomb activated carbon monolith or a wound filter with activated carbon embedded therein or a pleated filter with activated carbon embedded therein can be arranged in a form-fitting manner. The compensation tank according to the invention, in particular for air, for a battery cooling system has the aforementioned plastic tank housing having a first shell and a second shell sealed thereto. A first housing is provided in the first shell and / or in the second shell, in which a drying cartridge comprising a drying agent, for example zeolite or silica gel, is housed by form-fitting fit, while in the second housing, which can also be arranged in the first shell and / or in the second shell, an activated carbon cartridge according to the invention or a honeycomb activated carbon monolith or a wound filter with activated carbon embedded therein or a pleated filter with activated carbon embedded therein

[0012] can be arranged in a form-fitting manner. Such an activated carbon cartridge, just like a honeycomb activated carbon monolith, a wound filter with activated carbon embedded therein or a pleated filter with activated carbon embedded therein, is capable of absorbing pollutants such as, for example, hydrocarbons. A first valve is further provided, via which, in the event of excess pressure in the compensation tank, air can be expelled from the compensation tank into the environment, as well as a second valve, via which, in the event of a negative pressure in the compensation tank, fresh air can be sucked from the environment into the compensation tank. By "fresh air" can / must be understood the ambient air.The two-shell design of the reservoir housing of the compensation tank with the drying cartridge and, for example, the activated carbon cartridge arranged therein makes it possible to create a reservoir housing of the compensation tank that is very economical overall, while at the same time having advantages in terms of assembly, since it is simply sufficient to insert the drying cartridge designed as an insert part in a form-fitting manner into the first receptacle of the first and / or second shell and to insert the activated carbon cartridge designed as an insert part into the second receptacle of the first and / or second shell, and then to connect the two shells of the reservoir housing to each other in a sealed manner. This also allows a protected arrangement of the drying cartridge or the activated carbon cartridge in the reservoir housing over the entire service life.The same naturally applies to a honeycomb activated carbon monolith used instead of the activated carbon cartridge or to a wound filter with activated carbon embedded therein or to a pleated filter with activated carbon embedded therein. The production of the tank housing as well as the subsequent assembly of the drying cartridge or the activated carbon cartridge or the honeycomb activated carbon monolith or the wound filter or the pleated filter, which were previously necessary, can thus be completely omitted. The production of the compensation tank according to the invention can even be automated in particular, since the inner contour of the first housing, which is designed to be substantially complementary to an outer contour of the cartridge. drying, and the inner contour of the second housing, which is made so as to be substantially complementary to an outer contour of the activated carbon cartridge, the alveolar activated carbon monolith, the wound filter or the pleated filter, make it possible to obtain an insertion by complementary shape of the drying cartridge in the first housing and of the activated carbon cartridge, the

[0013] alveolar activated carbon monolith, the wound filter or the pleated filter in the second housing without the need for an operator. By arranging both the first valve and the second valve on the reservoir housing, these two valves can also be replaced when the drying cartridge / activated carbon cartridge, the alveolar activated carbon monolith, the wound filter or the pleated filter and / or when the reservoir housing is replaced, which, for example, reliably prevents the valves from clogging due to excessive use.

[0014] According to an advantageous improvement of the compensation tank according to the invention, the first valve is arranged in an intermediate wall which separates the second housing from an interior space of the tank housing. Air is generally arranged in the interior space of the tank housing, which air, depending on the temperature of the coolant, is put under pressure or under vacuum by an expansion or contraction of said coolant. By arranging the first valve in the intermediate wall which separates the second housing from the interior space of the tank housing, it is possible to achieve a direct association of the first valve with the second housing. Downstream of the second housing is certainly provided an opening in a wall of the tank housing towards the outside for exchange with the environment.

[0015] The second valve is then arranged in an outer wall of the tank housing, the outer wall in which the second valve is arranged separating the first housing from the environment. A suction of fresh air from the environment in the event of a negative pressure prevailing in the tank housing or in the compensation tank is therefore carried out via the second valve and the first housing in which the drying cartridge is arranged. The fresh air sucked in from the environment is thus sucked in by the drying agent of the drying cartridge and thus dried, which in particular prevents moisture and / or water from being introduced into the compensation tank or into the battery cooling system.Too much humidity could make the coolant electrically conductive, which under adverse circumstances, especially in the case of immersion cooling, could cause a short circuit.

[0016] The second valve described can then also be designed as a double valve, which also allows air to be expelled from the tank housing into the environment.

[0017] Furthermore, the respective inlet and outlet of the compensation tank, which interact with the atmosphere, can be provided with additional protective caps. These protect the valve or the activated carbon cartridge located inside against the undue ingress of water, dust or other unwanted disturbing bodies.

[0018] In a particularly preferred embodiment, a spring is arranged on the drying device or on the activated carbon cartridge, which spring pre-tensions the drying cartridge or the activated carbon cartridge against the reservoir housing. Such springs make it possible to achieve a reliable and positionally fixed arrangement of the drying cartridge in the first housing and of the activated carbon cartridge in the second housing, the pre-tensioning of the spring at the same time preventing the drying cartridge and / or the activated carbon cartridge from producing, during operation, popping noises which are perceived, for example, as annoying.Such a spring can, for example, be designed as a low-cost helical spring, wherein the helical spring for pre-tensioning the drying cartridge can be arranged in the first housing in such a way that it surrounds the second valve in the outer wall of the tank housing and is thus fixed by the second valve. The spring also makes it possible to pre-tension the activated carbon or drying granules, for example in the form of a bulk product, since the lid can slide in the pot in a piston-like manner, thereby reducing wear on said activated carbon or drying granules during operation.

[0019] According to a particularly preferred embodiment of the compensation tank according to the invention, the first shell and / or the second shell are produced as injection-molded plastic parts. The design of the first and / or the second shell as injection-molded plastic parts has the great advantage that the tank housing and thus the compensation tank can be manufactured not only with high quality, but also at a favorable price.

[0020] Suitably, the first shell and the second shell are welded together. When both shells are designed as injection-molded plastic parts, it is advantageous to weld them together to ensure a tight connection. Alternatively, it is certainly also possible to glue the two shells together. Alternatively, it is also conceivable, from a purely theoretical point of view, that the two shells are connected to each other by means of clip connections or screw connections, which has the great advantage of being able to open the reservoir housing to replace the drying cartridge or activated carbon cartridge, the honeycomb activated carbon monolith, the wound filter or the pleated filter, and to reuse said reservoir housing after replacing the drying cartridge or the activated carbon cartridge, the honeycomb activated carbon monolith, the wound filter or the pleated filter.

[0021] In this case, it is still necessary to insert a sealing gasket between the two shells.

[0022] In another advantageous embodiment of the compensation tank according to the invention, the first shell and / or the second shell are made of polyoxymethylene (POM). POM is a semi-crystalline thermoplastic having high mechanical strength and rigidity and, in addition, high wear resistance and low moisture absorption, which is particularly advantageous when used for the compensation tank according to the invention, since in this case water infiltration or moisture absorption increases the electrical conductivity of a dielectric coolant. It is also possible to use polyketone as the plastic material for the first and / or the second shell. Polyketones (PK) are high-performance thermoplastic polymers which have high impact strength, low wear, good solvent resistance and low water absorption.Polyketone also has a high environmental compatibility. In order to further increase the mechanical strength and also the wear resistance, the plastic material can have glass fibers, in particular 25% glass fibers, and be made in particular in the form of POM GF-25.

[0023] The present invention is further based on the general idea of ​​equipping a battery cooling system with a compensation tank described in the preceding paragraphs and thus applying to the battery cooling system the advantages described with regard to the compensation tank. Concretely, the advantages of a battery cooling system equipped with a compensation tank according to the invention lie in a low-cost manufacturing, for periodic replacement of the drying cartridge and / or the activated carbon cartridge, the honeycomb activated carbon monolith, the wound filter or the pleated filter, only the compensation tank or, in the case of an openable tank housing of the compensation tank, only the drying cartridge and / or the activated carbon cartridge, the honeycomb activated carbon monolith, the wound filter or the pleated filter having to be replaced.

[0024] Other important features and advantages of the invention will emerge from the subclaims, the diagrams and the description of the figures associated with the aid of the diagrams.

[0025] It is self-evident that the above-mentioned features and those which will be explained later can be used not only in the combination indicated in each case, but also in other combinations or alone, without departing from the scope of the present invention. The elements of a higher unit, such as for example a device, an apparatus or an arrangement, which are mentioned above and will be mentioned later, and are designated separately, can constitute separate parts or components of this unit or be integral areas or sections of this unit, even if this is represented differently in the diagram.

[0026] Preferred embodiments of the invention are shown in the diagrams and are explained in more detail in the following description, the same reference signs referring to identical or similar or functionally identical components.

[0027] We see there, respectively schematically: [Fig.l]: view of a compensation tank according to the invention of a battery cooling system according to the invention, [Fig.2]: representation identical to that of [Fig.l], but from another perspective, [Fig.3]: exploded view of the compensation tank according to the invention, [Fig.4]: sectional view of an activated carbon cartridge according to the invention, [Fig.5]: front view of the activated carbon of the activated carbon cartridge according to the invention, produced in the form of an activated carbon monolith, [Fig.6]: Front view of a filter wound with activated carbon of the activated carbon cartridge according to the invention, [Fig.7]: Oblique view of a pleated filter with activated carbon of the activated carbon cartridge according to the invention.

[0028] According to Figures 1 to 3, a compensation tank 1 according to the invention for air 2 of a battery cooling system 3 according to the invention has a tank housing 4 made of plastic having a first shell 5 and a second shell 6 connected thereto. In the first shell 5 and / or in the second shell 6, a first receptacle 7 (see [Fig. 3]) is provided or formed, in which a drying cartridge 8 is arranged in a form-fitting manner. An unspecified drying agent, for example zeolite or silica gel, is arranged in the drying cartridge 8. Furthermore, the compensation tank 1 according to the invention has a first valve 9 via which, in the event of excess pressure in the compensation tank 1, air 2 from the compensation tank 1 can be expelled into the environment.Fresh air 2a from the environment enters the compensation tank 1 via a second valve 10 in the event of a negative pressure in the compensation tank 1.

[0029] In the first shell 5 and / or the second shell 6, a second housing 11 is further provided, in which an activated carbon cartridge 12 according to the invention (see also [Fig. 4]) is housed in a form-fitting manner. Instead of the activated carbon cartridge 12, a honeycomb activated carbon monolith 20, a wound filter 21 with activated carbon 24 embedded therein, or a pleated filter 22 with activated carbon 24 embedded therein can also be arranged in a form-fitting manner in the second housing 11.

[0030] The compensation tank 1 shown therefore has the tank housing 4 with the two receptacles 7, 11 arranged therein and in which the drying cartridge 8 or the activated carbon cartridge 12 or the honeycomb activated carbon monolith 20 or the wound filter 21 or the pleated filter 22 are arranged. In the description of the figures below, reference is mainly made to the activated carbon cartridge 12, but all statements are also valid by analogy for an activated carbon monolith 20 arranged in place of the activated carbon cartridge 12 or a wound filter 21 with activated carbon 24 embedded therein or a pleated filter 22 with activated carbon (24) embedded therein.

[0031] In the event of excess pressure in the compensation tank 1, air 2 therefore flows out into the environment through the first valve 9 and the activated carbon cartridge 12 arranged in the second housing 11. The expulsion of the air 2 through the activated carbon cartridge 12, the honeycomb activated carbon monolith 20 or the wound filter 21 or the pleated filter 22 makes it possible to reliably retain pollutants such as, for example, hydrocarbons. The suction of fresh air 2a from the environment into the compensation tank 1 is carried out via the second valve 10 and the drying cartridge 8 in which the sucked-in fresh air 2a is dried. A protective cap 28 positioned at the fresh air inlet 2a or at the air outlet 2 prevents the entry of unwanted disturbing bodies, dirt particles, etc.

[0032] The first valve 9 is for this purpose arranged in an intermediate wall 13 which separates the second housing 11 from the interior space 16 of the tank housing 4. The second valve 10, which can also be a double valve, i.e. a valve permeable in both directions, is for this purpose arranged in an outer wall of the tank housing 4, which outer wall separates the first housing 7 from the environment. Certainly, the second valve 10 described above and a further pressure relief valve via which air 2 is expelled from the compensation tank 1 into the environment can also be arranged in the outer wall of the tank housing 4.

[0033] If we continue to observe [Fig. 3], we can see that respectively a spring 14 is arranged on the drying cartridge 8 and on the activated carbon cartridge 12, which springs pre-tension the drying cartridge 8 against the reservoir housing 4 and the activated carbon cartridge 12 also against the reservoir housing 4, here specifically against the intermediate wall 13. The two springs 14 enable vibration-free and therefore rattle-free fastening of the drying cartridge 8 and the activated carbon cartridge 12 in the respective housing 7, 11. This in particular improves user comfort due to the noise reduction.

[0034] The activated carbon cartridge 12 for a compensation tank 1 for a battery cooling system 3 has a cartridge housing 15 having a pot 17 and a lid 18 which can slide inside said pot in the manner of a piston, a pot bottom 25 of the pot 17 and the lid 18 being made to be permeable to air and in particular being covered on the inside with a fabric or non-woven fabric 19. For this purpose, the lid 18 and the pot bottom 25 have openings 27 (see [Fig. 4]). The non-woven fabric 19 is permeable to air and at the same time prevents an unwanted escape of the activated carbon 24 from the cartridge housing 15.

[0035] The activated carbon 24 arranged in the cartridge housing 15 may be in the form of a loose product (see [Fig. 4]). Alternatively, the activated carbon 24 may also be in the form of a honeycomb activated carbon monolith 20 (see [Fig. 5]) or be embedded in a wound filter 21 (see [Fig. 6]) or in a pleated filter 22 (see [Fig. 7]). In the latter two cases, the cartridge housing 15 may be omitted. According to [Fig. 4], the activated carbon 24 can be compressed to form the activated carbon monolith 20, while, according to [Fig. 6], the activated carbon 24 can be affixed to a support material 26, in particular a non-woven fabric, of the wound filter 21. In the same way, the activated carbon 24 can also be affixed to a support material 26, in particular a non-woven fabric, in the case of a pleated filter 22 according to [Fig. 7].

[0036] A seal 23 is arranged on the pot bottom 25 of the pot 17 to ensure sealing with respect to the intermediate wall 13 of the reservoir housing 4 of the compensation reservoir 1. The seal 23 then surrounds the air-permeable area on the pot bottom 25. This results in the fact that the air 2 expelled from the interior space 16 due to thermal expansion of the coolant due to the temperature necessarily flows through the activated carbon cartridge 12.

[0037] The first shell 5 and / or the second shell 6 and / or the cartridge housing 15 can be produced as injection-molded parts made of plastic, which not only allows high-quality production, but also inexpensive production. The two shells 5, 6 can be welded or glued to each other, but it is also conceivable, from a purely theoretical point of view, that the two shells 5, 6 are connected to each other by means of clip connections or screw connections, which has the great advantage of being able to open the reservoir housing 4 to replace the drying cartridge 8 or the activated carbon cartridge 12 and to be able to continue to use said reservoir housing after the replacement of the drying cartridge 8 or the activated carbon cartridge 12.

[0038] The first shell 5 and / or the second shell 6 can be made of polyoxymethylene (POM) or polyketone, i.e. a plastic material with high strength and low moisture absorption, which is particularly advantageous, in particular for a compensation tank 1 for air 2 of a battery cooling system 3. In order to further increase the strength and also the wear resistance of the tank housing 4, the plastic material of the two shells 5, 6 can be reinforced with fibers, in particular glass fibers.

[0039] All things considered, the activated carbon cartridge 12 according to the invention, the compensation tank 1 according to the invention and the battery cooling system 3 according to the invention make it possible to create an extremely economical solution, optimized in terms of mounting space and easy to maintain.

Claims

Claims

1. Activated carbon cartridge (12) for a compensation tank (1) for a battery cooling system (3), - comprising a cartridge housing (15) having a pot (17) and a lid (18), wherein a pot bottom (25) of the pot (17) and the lid (18) are designed to be air-permeable and are in particular covered from the inside with a fabric or non-woven fabric (19), - wherein activated carbon (24) is arranged in the cartridge housing (15), - comprising a seal (23) arranged on the pot bottom (25) and for sealing against an intermediate wall (13) of a tank housing (4) of the compensation tank (1), - comprising a spring (14) which bears on the lid (18).

2. Activated carbon cartridge according to claim 1, characterized in that the activated carbon (24) is arranged as a bulk product in the cartridge housing (15).

3. Activated carbon cartridge according to one of the preceding claims, characterized in that the cover (18) can slide in the pot (17) in the manner of a piston.

4. Activated carbon cartridge according to one of the preceding claims, characterized in that the cartridge housing (15) is made of plastic.

5. Compensation tank (1) for a battery cooling system (3), - comprising a tank housing (4) made of plastic, comprising a first shell (5) and a second shell (6) connected thereto, - in which a first receptacle (7) is formed in the first shell (5) and / or in the second shell (6), - comprising a drying cartridge (8) housed in a form-fitting manner in the first receptacle (7), - comprising a first valve (9) via which, in the event of excess pressure in the compensation tank (1), air (2) from the compensation tank (1) enters the environment, - having a second valve (10) through which, in the event of a negative pressure in the compensation tank (1), fresh air (2a) from the environment enters the compensation tank (1), - wherein a second housing (11) is formed in the first shell (5) and / or in the second shell (6), - wherein an activated carbon cartridge (12) according to one of the preceding claims or a honeycomb activated carbon monolith (20) or a wound filter (21) with activated carbon (24) embedded therein or a pleated filter (22) with activated carbon (24) embedded therein is housed in a form-fitting manner in the second housing (11).

6. Compensation tank according to claim 5, characterized in that the first valve (9) is arranged in an intermediate wall (13) which separates the second housing (11) from an interior space (16) of the tank housing (4).

7. Compensation tank according to claim 5 or 6, characterized in that a spring (14) is provided, which pre-tensions the drying cartridge (8) against the tank housing (4).

8. Compensation tank according to one of claims 5 to 7, characterized in that - the first shell (5) and / or the second shell (6) are produced as injection-molded parts made of plastic, and / or - the first shell (5) and the second shell (6) are welded, clipped, screwed or glued to each other.

9. Compensation tank according to one of claims 5 to 8, characterized in that the first shell (5) and / or the second shell (6) are made of polyoxymethylene (POM) or polyketone.

10. Compensation tank according to one of claims 5 to 9, characterized in that the first shell (5) and / or the second shell (6) have glass fibers, in particular a proportion of 25% of glass fibers in the plastic material.

11. Compensation tank according to one of claims 5 to 10, characterized in that the second valve (10) is arranged in an outer wall of the tank housing (4), which outer wall separates the first housing (7) from the environment.

12. Battery cooling system (3) comprising a compensation tank (1) according to one of claims 5 to 11.

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