WO2018233902A1

WO2018233902A1 - Flexible cooling plate for a battery

Info

Publication number: WO2018233902A1
Application number: PCT/EP2018/060010
Authority: WO
Inventors: Christian Schmid-Schoenbein
Original assignee: Robert Bosch Gmbh
Priority date: 2017-06-21
Filing date: 2018-04-19
Publication date: 2018-12-27
Also published as: EP3642891A1; CN110770931B; DE102017210343A1; CN110770931A

Abstract

The invention relates to a flexible cooling plate (40) for a battery having a film (41) into which a cooling medium (43) can be introduced, the flexible plate (40) having a system of film chambers (45) fluidically connected to each other, and a coolant inlet and a coolant outlet being fluidically connected to the film chambers (45).

Description

description

title

Flexible cooling plate for a battery

The present invention relates to a flexible cooling plate for a battery, to a battery cell system and a battery comprising the flexible cooling plate, and to the use of the battery according to the preamble of the independent claims.

State of the art

A battery is an electrochemical energy store that, when discharged, converts the stored chemical energy into electrical energy through an electrochemical reaction. It is becoming apparent that in the future, both in stationary applications, such as wind turbines, in motor vehicles that are designed as hybrid or electric motor vehicles, as well as in

Electronic devices new battery systems will be used, are placed on the very high requirements in terms of reliability, safety, performance and service life. Due to their high energy density, lithium-ion batteries are used in particular as energy stores for electrically powered motor vehicles.

For an optimal power balance and a sufficiently long service life of such battery systems, it is important to operate them within an optimal temperature range. The operating temperature has one

significant impact on the level of service provision, the extent of aging, the achievable service life and the

Operational safety of a battery system. For that reason, that will

Battery system cooled specifically. As cooling concepts, cooling systems have Basis of air cooling, coolant cooling or refrigerant cooling established. By default, one or more cell modules are brought into thermal contact with a so-called cooling plate and tempered by direct heat conduction. In this case, a sufficiently good thermal contact between the battery cells of the corresponding modules and the associated cooling plate plays an important role and is crucial for the sufficient heat dissipation from the corresponding battery cells.

In US 2007/292751 a battery with a heat absorbing element is disclosed, which is arranged between battery cells in a housing. The heat-absorbing element in this case comprises, for example, an aluminum or nickel foil into which a medium is introduced.

In US 2014/0224465 a heat barrier system is disclosed, which is arranged between two battery cells. The thermal barrier system includes, for example, a hydrophobic film in which, for example, a sponge-like material is introduced, which holds the thermal barrier system at the desired location. The thermal barrier system may include many honeycomb-like chambers that are not interconnected.

DISCLOSURE OF THE INVENTION According to the invention, a flexible cooling plate for a battery and a

Battery cell system, in particular a lithium-ion battery cell system and a battery, in particular a lithium-ion battery comprising the flexible

Cooling plate, as well as the use of the same with the characterizing

Features of the independent claims provided.

The flexible cooling plate according to the invention has a film into which a cooling medium can be introduced.

The film comprises, for example, a polypropylene and / or a polyethylene and / or a polyurethane and / or polyphenylene sulfide and / or a polyketone and / or a polyamide. The film is also, for example, part of a laminate with aluminum or steel foil.

The flexible cooling plate comprises a system of fluidically interconnected foil chambers, with which a coolant inlet and a coolant outlet are in fluid communication.

The advantage here is that the flexible cooling plate is movable and elastic by the film chambers and can perfectly adapt to the shape of the surface to be cooled, to which it is applied. As a result, the surface on which the flexible cooling plate, for example applied to a battery cell or to a plurality of battery cells, significantly increased compared to

conventional cooling plates, which are made of rigid materials, for example.

It is also advantageous that the flexible cooling plate adapts to changes in the surface to be cooled, such as, for example, to intumescent battery cells, in terms of shape, and thus continues to bear against the entire surface. Furthermore, the flexible cooling plate can cling to shifting surfaces of the battery cells to be cooled. Such a shift of the surfaces to be cooled may be due to the swelling of the battery cells or by an external acceleration on the battery pack, which

Battery cells included, take place.

Swelling of battery cells is done for example by storage and removal of lithium ions during charging and discharging cycles or age-related by gas formation inside the battery cell. Furthermore, the

Material costs for the flexible cooling plate are very low compared to

conventional cooling plates.

Further advantageously, the flexible cooling plate can expand by the applied liquid pressure after assembly. Thus, a simplified force-free assembly in a compact state is possible. Manufacturing tolerances caused by insulating air gaps between the battery cells and the flexible

Cooling plate are then removed by expanding the flexible cooling plate during its operation.

Further advantageous embodiments of the present flexible cooling plate emerge from the subclaims. In a first preferred embodiment, the film of the flexible cooling plate comprises a first film and a second film, wherein the first film is so connected to the second film at certain intervals that the fluidically interconnected film chambers between the first film and the second film are formed. The connection between the first film and the second film is for example a sealed connection, a welded connection and / or an adhesive connection. The film chambers which are fluidly interconnected by the connection of the first film and the second film are preferably arranged parallel to one another. The film chambers are preferably open at two ends, which point in the direction of the coolant inlet and the coolant outlet, so that cooling medium which flows through the coolant inlet into the flexible cooling plate enters the film chambers through the open ends and flows along the film chambers until it reaches the other open Ends which face the coolant outlet, the foil chambers leaves again and exits through the coolant outlet again from the flexible cooling plate.

The advantage here is that the cooling medium in this way in the desired

Direction is directed and selectively flows through the foil chambers, so that the heated cooling medium is not too long dwells in the flexible cooling plate, but again flows out of this and can deliver the heat absorbed outside the flexible cooling plate.

Another advantage is that the cooling medium can be passed through the foil chambers so past the battery cells, that all foil chambers heat evenly and all battery cells are cooled as uniformly as possible.

In a variant of the first embodiment, the connection between the first film and the second film is not continuous, so that cooling medium, which flows into a film chamber through one or more gaps in the connection between the film chambers can flow into adjacent film chambers. The advantage here is that the temperature of the

Cooling medium between the different film chambers can compensate by the cooling medium by the passage into adjacent film chambers mixed. This is advantageous in particular when different parts of the surface to be cooled, for example the battery cell, heat to different degrees. In an additional or alternative variant of the first embodiment, the film chambers are not arranged in a straight line parallel to each other, but have a different shape, which, for example

is meander-shaped.

The advantage here is that the cooling medium flows past a larger area of the element to be cooled, for example one or more battery cells, and thus can absorb and dissipate more heat.

Furthermore, it is advantageous that the flexible cooling plate can be produced very simply, since the first and the second foil of the flexible cooling plate bend,

can be folded, heated and sealed without being damaged and even after production are flexible, elastic and foldable, what also the

Storage and transport of the flexible cooling plate easier.

In the first embodiment, for example, a plastic component sealed to the first film and / or to the second film serves as a coolant inlet and / or as a coolant outlet. The plastic component is for example an injection-molded component.

The advantage here is that the production, for example, the seal, is very simple and inexpensive.

In a second embodiment, the film of the flexible cooling plate comprises a first film and a second film and the flexible cooling plate further comprises a molded part, in particular a plastic molded part. The molded part has, in particular, parallel ribs, between which the fluidically interconnected foil chambers extend. The first film is advantageously located on a first side of the molding and the second film is advantageously located on a second side of the molding so that the first film and the second film envelop the molding at least partially. Between the particular parallel ribs of the molding extend the Foil chambers, which are bounded on the first side of the first film and on the second side of the second film.

The advantage here is that the flexible cooling plate is given by the molding a certain strength and dimensional stability, but this is still movable and elastic by the film chambers and the shape of the cooled

Surface on which it rests very well.

Furthermore, in the second embodiment, the flexible cooling plate is easier to grasp in manufacturing and easier to place. Furthermore, the foil chambers stabilized by the molded part prevent the structure of the foil chambers filled with cooling medium from being collobed. This is from

Advantage, when the filling, in particular the liquid filling, occurs during construction or when connecting with negative pressure. The negative pressure draws the cooling medium in this case in the foil chambers. The molded part is for example an injection-molded part.

In a variant of the second embodiment, the ribs of the molding are not arranged in a straight line parallel, but have a different shape, which is formed, for example, meandering. Preferably, the interconnected foil chambers then have a meandering shape. As a result, the cooling medium flows along a larger surface of the element to be cooled and can thus absorb more heat and dissipate.

In a preferred variant of the second embodiment, the first film and the second film at certain intervals connected to the molding, in particular the ribs of the molding, in particular sealed, that the fluidically interconnected film chambers between the first film and the second film are.

In this case, the first film is fastened on a first side of the ribs of the molded part, and the second film is fastened on a second side of the ribs of the molded part, so that film chambers are created between the ribs of the molded part. The advantage here is that the film chambers of the molding are very stable in this way and remain dimensionally true, and yet are elastic and adapt to the surface to be cooled. Furthermore, in one embodiment, the first film and the second film extend beyond the edges of the molded part, so that the first and the second film can be connected to one another and at least partially enclose the molded part. This connection may be, for example, a sealed or welded joint. Alternatively, the first film and the second film do not protrude beyond the molding. The first and second foils are then sealed or welded, for example, to the edges of the molded part.

The molded part comprises, for example, fastening means, in particular eyelets, wherein the fastening means are for example localized at the edges of the molded part and serve for fastening the molded part. The molding can then be screwed for example.

In a preferred alternative or additional variant of the second

Embodiment, the molding comprises a coolant inlet nozzle, which serves as a coolant inlet and a collector, which on the

Coolant inlet nozzle adjacent.

The advantage here is that the collector acts as a kind of inverted funnel and distributes the cooling medium. The cooling medium, which flows into the flexible cooling plate via the coolant inlet connection, passes from the coolant inlet connection to the collector. The collector has, for example, the shape of a roof, which drops perpendicular to the foil chambers and thereby distributes the cooling medium to the width of the flexible cooling plate, so that the cooling medium does not collect at the point of entry. The cooling medium finally flows into the foil chambers. That way

prevents uneven flows of the cooling medium within the flexible cooling plate and ensures rapid flow through the flexible cooling plate.

For example, a sealing method, in particular a thermal sealing method or an ultrasonic sealing method, is used for connecting the first and the second film of the film chambers to one another or for connecting the first and the second film to the ribs of the molded part. An advantage of a seal by a seal is that a dense, good

Connection arises. In one embodiment, the flexible cooling plate inflates by itself.

In this case, the final shape is determined by the fluid pressure and the geometry of the film (s). The film is inflated by the internal pressure until it touches an external surface, such as a battery cell, which prevents further expansion. Furthermore, the film may be formed in a stretchable form so that air gaps can be bridged beyond the unstretched length of the film. In all the above embodiments and variants, the flexible comprises

Cooling plate in the film chambers, for example, plastic mold, in particular plastic grids, which are introduced into the film chambers. The advantage here is that the strength of the flexible cooling plate is increased by the plastic molding and the film chambers through the

Do not let plastic formers squeeze so much and thus their

Maintaining shape in essence. This ensures that the flexible cooling plate, if it is for example arranged between battery cells or between battery modules, is not compressed non-uniformly, but the height of the flexible cooling plate over the surface is substantially equal, whereby a uniform absorption and removal of heat

is guaranteed. Furthermore, the structure comprising the flexible cooling plate and the battery cells or battery modules is then stronger and more stable.

Another advantage of the plastic former is that through this one

Turbulence is generated within the foil chambers. As a result, the cooling medium mixes efficiently within the foil chambers. The cooling medium, which flows in an outer region of the film chamber and thus absorbs a lot of heat from the surface to be cooled, mixes with

Cooling medium, which flows in a central region of the film chamber and thus absorbs less heat. In this way, the cooling medium can absorb more heat.

The plastic formers include, for example, several components, the individual parts are not related to each other. Alternatively, the plastic former is a single component. In all the above embodiments and variants flows through the

Cooling medium, the film chambers of the flexible cooling plate, for example, continuously, in particular in a circuit.

The advantage here is that heat is absorbed by the surface to be cooled by the cooling medium in the flexible cooling plate and the cooling medium is cooled again after leaving the flexible cooling plate. In this way, an efficient cooling of the components to be cooled is guaranteed.

The cooling medium is for example a water-glycol mixture. Alternatively, the cooling medium is for example water, oil, a water-oil mixture or a gas, in particular air.

The flexible cooling plate is preferably part of a cooling system, wherein the cooling system further comprises, for example, a heat exchanger, a fan and a pump. The cooling medium, which by the absorption of heat, for example from one or more battery cells, the

Flow through the film chambers is heated, flows through the

Coolant outlet from the flexible cooling plate addition and is directed, for example, to a heat exchanger. There, the cooling medium is blown, for example, by a fan with cold air, so that cools the warm cooling medium. Subsequently, the cooled cooling medium of the flexible cooling plate is again supplied via the coolant inlet, where it re-enters the foil chambers of the flexible cooling plate. The coolant circuit is driven for example by a pump.

Furthermore, a battery cell system comprising the flexible cooling plate

Subject of the present invention. The flexible cooling plate is arranged, for example, on or between pouch foils of a battery cell system, the pouch foils being separated from one another by pockets for introducing

Form electrode interconnects, the pockets are electrolyte-impermeable and wherein the pockets, especially in the operating state of the battery cell system, are physically connected to each other foldable over the Pouchfolie.

The term pouch film in the context of this invention means a flexible film, in particular a composite film, which is impermeable to electrolyte. The pouch film comprises, for example, a composite of polyamide,

Polypropylene, polyethylene terephthalate, polypropylene and / or Metal, in particular aluminum. The pouch film has, for example, a thickness of 40-200 μηι.

In one embodiment, for example, the pouch film comprises a laminate without aluminum, in particular without metal, instead of a conventional polyethylene and aluminum pouch film.

The term electrode composite is to be understood as meaning a composite comprising at least one anode and at least one cathode, which can reversibly charge and remove lithium ions.

Furthermore, the electrode assembly comprises at least one separator, which separates the anode and the cathode both spatially and electrically from each other. The anode, the separator and the cathode may be wound together or stacked one on top of the other.

The electrode composites are introduced into the separate pockets of the pouch film. Thus, one electrode composite together with a pocket of the pouch foil forms a battery cell or a pouch cell, wherein the pouch cells are physically connected to each other in a foldable manner via the pouch foil.

The advantage here is that such a battery cell system can be designed very flexible. The pouch film with the contiguous pockets can be folded in many different ways, so that the shape of the battery cell system can be individually designed, for example, in terms of space requirements, size, folding techniques and contacting options. It is also advantageous that the battery cell system has no limit as far as the stack height is concerned. For example, several battery cell systems can be stacked on top of each other or at least one

Battery cell system is folded such that the contiguous

Pouch cells are arranged on top of each other.

It is also advantageous that the electrode composites which are introduced into the pockets of the poch film can swell due to the flexible surrounding pouch film, for example, by storage and removal operations of the lithium ions or age-related. This prevents shifts and

Damage to the electrode assemblies due to excessive pressure acting on them. An advantage of a battery cell system comprising the flexible cooling plate is that the battery cell system is very flexible. The flexible cooling plate as well as the coherent Pouchfolie with introduced into this

Electrode bonds are very flexible and bendable, which gives much freedom in the design of the battery cell system, for example with regard to the structure, the shape and the size of the battery cell system. Because both the pouch film with introduced electrode interconnections as well as the flexible

Cooling plate as a delimitation include a film, a particularly good juxtaposition of the two components is ensured, so that the respective films lie substantially over the entire surface together.

The flexible cooling plate is arranged, for example, on or between pouch foils of a battery cell system,

In one embodiment, the first foil of the flexible cooling plate and / or the second foil of the flexible cooling plate simultaneously form part of a pouch foil of a battery cell of the battery cell system.

The advantage here is that thus material and cost of the film, which are eliminated saves. Furthermore, a slipping of the flexible cooling plate is not possible in this way. Also, the flexible cooling plate and the pouch film of the battery cell system are thus inevitably on the entire surface to each other, which ensures a particularly good heat transfer.

Furthermore, a battery comprising the flexible cooling plate and in particular a battery cell system is the subject of the present invention wherein the flexible cooling plate is arranged on or between battery modules of the battery, in particular on or between battery modules, which have a flexible housing, which forms a hermetic barrier and the whole Battery cell system and the voltage tap of the battery module wrapped. For example, the flexible cooling plate is likewise arranged inside the enclosure. Alternatively, the cooling plate is outside the

Sheath arranged.

The term battery cell system is to be understood here as a plurality of pouch cells, which together form a battery module. The smallest unit of a corresponding battery module form two pouch cells. ""

- 12 -

The term envelope is used in the context of this invention

motion flexible film to understand. In one embodiment, the

Wrapping a laminated film. In one embodiment, the wrapper is made moisture impermeable. The wrapper includes, for example

Aluminum, steel, a polyphenylene sulfide, a polynorbornene and / or a liquid crystal polymer.

The battery is used for example in an electric vehicle, in a hybrid vehicle or in a plug-in hybrid vehicle. Alternatively, the finds

Battery, for example, application in ships, two-wheelers, aircraft, stationary energy storage, power tools, consumer electronics and / or household appliances.

Short description of the drawing

Embodiments of the present invention are illustrated in the drawing and explained in more detail in the following description of the figures. It shows:

1 shows a schematic representation of a first embodiment of a flexible cooling plate according to the invention with foil chambers in a cross section,

Figure 2: a schematic 3D representation of a second

Embodiment of a flexible cooling plate according to the invention with film chambers and a molded part, Figure 3 is a schematic representation of a 3D view of a

Battery cell system with a Pouchfolie and

Connected electrodes,

Figure 4: a schematic representation of a battery module with two

Battery cell systems according to Figure 4, and Figure 5: a schematic representation of a battery with battery modules and a flexible cooling plate according to the invention in a cross section.

Embodiments of the invention

In Figure 1 is a cross section through a flexible cooling plate 40 in a first

Embodiment shown. The flexible cooling plate 40 has a foil 41 which comprises, for example, a polypropylene and / or a polyethylene and / or a polyurethane and / or polyphenylene sulfide and / or a polyketone and / or a polyamide. The film 41 is also part of a

Laminate with aluminum or steel foil.

The flexible cooling plate 40 has a system fluidly interconnected

Foil chambers 45 on. The film 41 of the flexible cooling plate 40 comprises a first film 41 a and a second film 41 b. The first film 41a is connected at certain intervals to the second film 41b such that the fluidically interconnected film chambers 45 are formed between the first film 41a and the second film 41b. The connection of the first

Foil 41a with the second foil 41b is, for example, a sealed joint or a welded joint. In the film chambers 45 is a cooling medium 43rd

brought in.

A not shown in Figure 1 coolant inlet and a not shown in Figure 1 coolant outlet are in fluid communication with the

Foil chambers 45. The coolant inlet and the coolant outlet are

For example, one each to the first film 41a and / or to the second film 41 b sealed plastic component.

In the film chambers 45 of the flexible cooling plate 40 are plastic-formers 47, in particular plastic grids, introduced, which to increase the

Strength of the flexible cooling plate 40 and serve to generate turbulence. The film chambers 45 of the flexible cooling plate 40, for example, continuously flowed through by a cooling medium 43, in particular in a circuit.

In Figure 1, the flexible cooling plate 40 is located on both sides directly to each one Battery module 100 on. The connecting regions 49 of the first film 41 a and the second film 41 b can be pushed together in a direction A, so that the film chambers 45 are very close to each other or at least partially touch. FIG. 2 shows a flexible cooling plate 40 in a second embodiment. The flexible cooling plate 40 comprises a foil 41 and a shaped part 50, in particular a plastic molded part. The molded part 50 is, for example, an injection-molded part. The molded part 50 has ribs 51 arranged in parallel. The film 41 of the flexible cooling plate 40 comprises a first film 41 a and a second film 41 b. The first film 41 a is located on a first side, in FIG. 1 on the upper side, of the molded part 50, and the second film 41 b is located on a second side, in FIG. 1 on the underside of the molded part 50, the lower side in FIG is not visible. The first film 41a and the second film 41b envelop the molding 50.

Between the ribs 51 of the molding 50 extend film chambers 45, which are delimited on the first side of the first film 41 a and 41 b on the second side of the second film. The foil chambers 45 are fluidically connected to each other.

The first foil 41 a and the second foil 41 b are connected to the ribs 51 of the

Molded part 50 connected, in particular sealed. As a result, the fluidically interconnected foil chambers 45 are formed between the first foil 41a and the second foil 41b.

In a variant of the second embodiment, not shown in FIG. 2, the ribs 51 of the shaped part 50 are not arranged in a straight line in parallel, but instead have a different shape, which is meander-shaped, for example.

In FIG. 2, the first film 41 a and the second film 41 b project beyond the edges of the molded part 50 and are connected to one another there, for example via a sealed or welded connection, so that they enclose the molded part 50. In a variant of the second embodiment, not shown, the first foil 41 a and the second foil 41 b do not protrude beyond the shaped part 50. The first and the second film 41 a, 41 b are then sealed or welded to the edges of the molding 50, for example. The molded part 50 comprises, for example, fastening means 53, in particular eyelets. The attachment means 53 are located at the edges of the molding 50 and serve to secure the molding 50 to other components.

The molded part 50 comprises a coolant inlet pipe 55, which as

Coolant inlet serves as well as a collector 57, which at the

Coolant inlet nozzle 55 adjacent. Analogously, the molded part 50 comprises a coolant outlet port 59, as well as a further collector 61.

In the film chambers 45 of the flexible cooling plate 40, for example, not shown in Figure 2 plastic-form sensor, in particular plastic grating, are introduced. Which may be formed in one piece or multiple parts.

The film chambers 45 of the flexible cooling plate 40, for example, continuously with a cooling medium, in particular in a circuit flows through.

FIG. 3 shows an embodiment of a battery cell system 1.

The battery cell system 1 has a pouch film 3 and three electrode composites 5. By way of example, the three electrode composites 5 represent any number of electrode interconnections 5.

The pouch film 3 has a length L and a width B, wherein the length L is longer than the width B. Furthermore, the pouch film 3 has a first

Side length L1 and one of these opposite second side length L2, and a first side width B1 and a second opposite this

Page width B2 on. The pouch film 3 forms separate pockets 12, which are foldably connected to each other. The pouch film 3 is

elektrolytundurchlässig.

Each electrode composite 5 has an anode with an anode contact lug 7, a separator and a cathode with a cathode contact lug 8, which are stacked on top of each other. In an alternative, not shown

Embodiment, an electrode assembly 5, a plurality of anodes and / or anode contact lugs 7 and a plurality of cathodes and / or

Cathode contact lugs 8 on. The anode contact lugs 7 and the

Cathode contact lugs 8 are used for electrical contacting of the anode and the cathode. In each pocket 12 of the pouch film 3, an electrode assembly 5 is inserted such that the anode contact lug 7 and the Cathode contact lug 8 offset from each other over a first side length L1 of the pouch film 3 survive.

Depending on an electrode composite 5 forms a pouch cell 10 together with a pocket 12 of the pouch film 3.

The pouch film 3 comprises, for example, a composite of polyamide,

Polypropylene, polyethylene terephthalate, polypropylene and / or

Metal, in particular aluminum.

The pouch film 3 is folded over along the longitudinal extent, so that a first pouch film half 3a and a second pouch film half 3b are present. In the Pouchfolienhälften 3a, 3b are the width B to in, in particular regular,

Interspersed transverse seams 14 a introduced, which form spatially separated pockets 12. The transverse seams 14a are introduced, for example, by sealing the two Pouchfolienhälften 3a, 3b with each other. The pockets 12 of the pouch film 3 are closed length L according to a longitudinal seam 14b, which is introduced, for example, by sealing the Pouchfolienhälften 3a, 3b at its open end. In this case, the anode contact lugs 7 and the cathode contact lugs 8 in an area in which they to the

Pouch foil halves 3a, 3b abut, with sealed.

In the pockets 12 of the pouch film 3, for example, an electrolyte is introduced, wherein the pockets 12 form a barrier to the electrolyte.

The battery cell system 1 furthermore comprises at least one flexible cooling plate 40 (not shown in FIG. 3), in particular according to FIG. 1 or 2

flexible / n cooling plate / n 40 is / are here directly to the pouch film 3 of the

Battery cell system 1 is arranged.

In an embodiment not shown in FIG. 3, the first foil 41a of the flexible cooling plate 40 and / or the second foil 41b of the flexible cooling plate 40 simultaneously form part of a pouch foil 3 of a battery cell 10 of FIG

Battery Cell System 1. FIG. 4 shows an embodiment of a battery module 100 having two

Battery cell systems 1a, 1 b shown in Figure 3.

The pouch cells 10 of the first battery cell system 1 a are in this case slightly offset from the pouch cells 10 of the second battery cell system 1 b. It is one each

Cathode contact lug 8 of a first pouch cell 10a of a first

Battery cell system 1 a with an anode contact lug 7 a first pouch cell 10a of a second battery cell system 1 b electrically contacted. The anode contact lug 7 of the first pouch cell 10a of the first battery cell system 1a is in turn electrically contacted with the cathode contact lug 8 of the second pouch cell 10b of the second battery cell system 1b. That way, everyone is

Contact lugs 7, 8 of the battery cell systems 1 a, 1 b electrically connected to each other. To each electrically connected contact lug pair are

Balancing lines 39 for balancing, for example in the form of

Ribbon cables, attached. They are connected to the cell monitoring system CSC.

A flexible enclosure 20 is mounted around the battery module 100 which is a hermetic moisture barrier and encloses it in a moisture-tight manner.

For example, at least one flexible cooling plate 40 (not shown in FIG. 4), in particular according to FIG. 1 or 2, rests against the battery module 100. The flexible / n cooling plate / n 40 is / are here one or both sides of the

movable flexible enclosure 20 of the battery module 100 is arranged. In an alternative embodiment, the at least one flexible cooling plate 40

for example, within the flexible housing 20 of the

Battery module 100 is arranged.

In an alternative embodiment, not shown in FIG. 4, the battery module 100 comprises, for example, only one battery cell system 1 around which the flexible housing 20 is mounted.

FIG. 5 shows a battery 1000 with battery modules 100 and a flexible cooling plate 40 according to the invention according to FIG. 1 in a cross section. On both sides of the flexible cooling plate 40, a respective battery module 100 is arranged. The battery modules 100 of the battery 1000 each comprise five battery cells 10, which stand by way of example for any number of battery cells 10. The battery modules 100 are

For example, each formed from a battery cell system 1 according to Figure 3. Alternatively, a battery module 100 according to FIG. 4 is arranged on both sides of the flexible cooling plate 40.

Furthermore, alternatively, the battery cells 10 of the battery modules 100 are, for example, prismatic battery cells with a rigid housing. The battery 1000 is limited by a battery case 1001.

Claims

claims

Flexible cooling plate (40) for a battery, with a film (41) into which a cooling medium (43) can be introduced, characterized in that the flexible cooling plate (40) has a system of fluidically interconnected foil chambers (45) and wherein a coolant inlet and a coolant outlet is in fluid communication with the foil chambers (45).

Flexible cooling plate (40) according to claim 1, characterized in that the film (41) comprises a first film (41 a) and a second film (41 b), wherein the first film (41 a) at such intervals with the second Foils (41 b) connected, in particular sealed, that the fluidically interconnected film chambers (45) between the first film (41 a) and the second film (41 b) are formed.

Flexible cooling plate (40) according to any one of the preceding claims, characterized in that as the coolant inlet and / or as a coolant outlet to the film (41), in particular one of the first film (41 a) and / or one to the second film (41 b), sealed plastic component is used.

Flexible cooling plate (40) according to claim 1, characterized in that the film (41) comprises a first film (41 a) and a second film (41 b) and that the flexible cooling plate (40) further comprises a molded part (50) , in particular a plastic molded part, wherein the molded part (50) in particular has parallel arranged ribs (51), between which extend the fluidically interconnected film chambers (45).

Flexible cooling plate (40) according to claim 4, characterized in that the first film (41 a) and the second film (41 b) at certain intervals in such a way with the molded part (50), in particular the ribs (51) of the molded part (50). connected, in particular, are sealed, that the fluidic interconnected film chambers (45) between the first film (41 a) and the second film (41 b) are formed.

6. Flexible cooling plate (40) according to any one of claims 4 or 5, characterized in that the molded part (50) has a coolant inlet nozzle

(55) which serves as a coolant inlet and in that the molded part (50) comprises a collector (57) which adjoins the coolant inlet nozzle (55).

7. Flexible cooling plate (40) according to any one of the preceding claims, characterized in that in the film chambers (45) plastic forming device (47), in particular plastic grids are introduced, which for increasing the strength of the flexible cooling plate (40) and Generation of turbulence serve.

8. Flexible cooling plate (40) according to one of the preceding claims, characterized in that a cooling medium (43) continuously, in particular in a circuit, the film chambers (45) of the flexible cooling plate (40) flows through.

9. battery cell system (1) comprising a flexible cooling plate (40) according to any one of the preceding claims, characterized in that the flexible cooling plate (40) on or between pouch foils (3) of a

Battery cell system (1) is arranged, wherein the Pouchfolien (3) separated from each other pockets (12) for introducing electrode interconnects (5), wherein the pockets (12) are electrolyte-impermeable and wherein the pockets (12), in particular in the operating state of the battery cell system (1), physically about the

Pouchfolie (3) are foldable interconnected.

10. Battery cell system (1) according to claim 9, characterized in that the first film (41 a) of the flexible cooling plate (40) and / or the second film (41 b) of the flexible cooling plate (40) at the same time a part of a pouch film (3 ) forms a battery cell (10) of the battery cell system (1).

1. A battery comprising a flexible cooling plate (40) according to any one of claims 1-8, and in particular a battery cell system (1) according to one of claims 9 or 10, characterized in that the flexible cooling plate (40) is arranged on or between battery modules (100) of the battery, in particular on or between battery modules (100), each having a flexible housing (20), which one Represents hermetic moisture barrier and the entire battery cell system (1) and the voltage tap (22) of the battery module (100) wrapped.

12. The use of the battery according to claim 1 1 in an electric vehicle, in a hybrid vehicle or in a plug-in hybrid vehicle.