WO2021008875A1

WO2021008875A1 - Cooling system and energy store having a cooling system

Info

Publication number: WO2021008875A1
Application number: PCT/EP2020/068592
Authority: WO
Inventors: Marina Nussko; Jean-Marie BRÄUNIG; Reiner Dirr; Tim Leichner; Peter Kritzer; Andreas Als; Sascha Möller; Tim Langner; Marc Knapp
Original assignee: Carl Freudenberg Kg
Priority date: 2019-07-12
Filing date: 2020-07-02
Publication date: 2021-01-21
Also published as: DE102019118905A1

Abstract

The invention relates to a cooling system (1) for an energy store, comprising at least one cooling element (3), which has a wall (31) and a volume (32) that is delimited from the wall (31) and through which a coolant can flow, wherein at least one passage (4) is introduced into the cooling element (3), which passage is separated at least in part from the volume (32) by the wall (31), wherein an emergency opening apparatus is associated with the passage (4), which emergency opening apparatus opens under the effect of heat and/or pressure and thus produces a fluidic connection between the volume (32) and the 10 passage (4), and to an energy store (17).

Description

Cooling system and energy store with a cooling system The invention relates to a cooling system for an energy store, which has at least one cooling element. The invention also relates to an energy store with such a cooling system.

Energy storage devices in the form of lithium-ion batteries are known from the prior art, for example as energy storage devices for electrical energy

powered vehicles. These lithium-ion batteries include a large number of rechargeable battery cells

Energy storage cells which have a cell housing and at least two electrodes arranged in the cell housing. The electrodes are in the cell housing in the case of organic lithium-ion batteries from an electrolyte based on an organic solvent or

Surrounded solvent mixture.

If such energy storage devices are incorrectly manufactured, if they are damaged during operation or if they are overstrained by, for example, overcharging, this can lead to irreversible decomposition of

Electrolyte components come. For example, an oxidative

Decomposition of the organic solvent take place on an electrode surface. The heat of reaction generated during this decomposition and the resulting gaseous decomposition products are for a

so-called thermal runaway and the resulting destruction of the affected rechargeable

Battery cell responsible. During this thermal runaway, the affected rechargeable battery cell is heated very quickly and locally and there is an associated increase in the internal cell pressure in the cell housing of the rechargeable battery cell concerned. The thermal runaway usually ends in an uncontrolled breaking or bursting of the

Cell housing and a burnout of the electrolyte components. This process can take place suddenly, in the form of an explosion or locally with the formation of a focal beam.

In order to allow the respective rechargeable battery cell to burn off in a controlled manner in the event of thermal runaway and to prevent the energy store from being completely burned out, the rechargeable battery cells usually each have a predetermined breaking point in the form of a fuse opening. This safety opening opens when a critical internal cell pressure is exceeded and thus prevents the uncontrolled breaking of the cell housing of the rechargeable

Battery cell. The increased internal pressure in the cells, the responsible gaseous decomposition products and the resulting

The heat of reaction can be discharged into a controlled focal beam, which is attached to the opened fuse opening of the rechargeable

Battery cell leaks.

If an individual rechargeable battery cell is thermally runaway, there is a risk that the adjacent rechargeable battery cells will be heated to such an extent that thermal runaway can also take place in them. A chain reaction can thus be triggered which only ends when no more rechargeable battery cells can be heated in the effective area of the first battery cell that was thermally broken. In the worst case, the thermal runaway leads to a complete burnout of the energy storage device. The chain reaction can be interrupted by an additional emergency cooling of the entire energy storage device, so that only a single or a few rechargeable battery cells are destroyed in the event of thermal runaway. Under certain circumstances, this can ensure that the energy storage device continues to function despite the thermal runaway of an individual rechargeable battery cell.

For cooling the energy store in the event of thermal runaway, a separate emergency cooling system is known from the prior art, which is integrated into the energy store in addition to a standard cooling system. This emergency cooling system is only used for emergency cooling of the energy store during thermal runaway or the like.

For example, DE 20 2007 011 578 U1 reveals a device with an energy store and an air conditioning system, in which the air conditioning system functions as an emergency cooling system and its circulating medium is the

Energy storage supplies during the thermal runaway.

WO 2011 054 582 A1 describes an energy store into which a liquefied gas contained in a container is introduced when a critical temperature is exceeded.

The presence of this additional emergency cooling system makes that

Total weight of the energy storage increased. In addition, in the event of a single rechargeable battery cell thermal runaway, not only the affected rechargeable battery cell is cooled, but the entire energy store. For this you need additional

Emergency cooling systems have sufficient coolant, which in turn also has a negative effect on the total weight of the energy storage device.

Furthermore, such emergency cooling systems often have a

Temperature sensor that monitors the temperature of the energy store. The temperature determined by the temperature sensor is an Thermal management system of the energy storage device, which starts the emergency cooling system when a critical temperature is exceeded so that the coolant can be fed to the energy storage device for emergency cooling. The reaction times of these thermal management systems are so long that the chain reaction during thermal runaway is usually very far advanced by the time the coolant reaches the affected rechargeable battery cells.

The invention is therefore based on the object of further developing a cooling system and an energy store with a cooling system of the type mentioned at the outset in such a way that they enable emergency cooling that takes place with a reduced reaction time and is aimed at the area of thermal runaway while simultaneously reducing the total weight of the energy store.

This object is achieved according to the invention by a cooling system with the

Features of claim 1 and an energy store with the features of claim 15 solved. Take on an advantageous embodiment

Subclaims reference.

The cooling system according to the invention for an energy store has at least one cooling element which comprises a wall and a volume that is delimited by the wall and through which a coolant can flow. At least one passage, which is at least partially separated from the volume by the wall, is made in the cooling element. The passage is preferably completely separated from the volume by the wall. An emergency opening device is assigned to the passage, which opens when exposed to heat and / or pressure and thereby a

Establishes a flow-conducting connection between the volume and the passage.

The cooling system according to the invention can serve both as a standard cooling system and as an emergency cooling system for an energy store in which a such a cooling system is used. In an essentially error-free operation of this energy store, the emergency opening device is closed and the cooling system functions as standard cooling for the energy store.

Essentially error-free means that the

Energy storage no errors occur which lead to an impermissible pressure and / or temperature rise above a critical value in one or more of its energy storage cells. As before, errors in the energy store or one of its energy storage cells can occur

described, in the event of an incorrect lowering position, damage or

Overstress occurs during operation of the energy storage and lead to a thermal runaway of one or more of the energy storage cells (English: thermal runaway), which with a pressure increase in the interior of the energy storage cell and / or with an ignition of the

Energy storage cell is connected.

In particular, the ignition of the energy storage cell can lead to a chain reaction in the energy storage and its partial or

lead to complete destruction. It comes in at least one of the

Energy storage cells due to such a fault to an internal pressure and / or temperature rise and if the internal temperature and / or the internal pressure exceeds a critical value, the opens

Emergency opening device, whereby a flow-conducting connection is established between the volume and the passage. As a result, the coolant flowing through the volume, which is preferably under pressure, is fed to the energy storage cell concerned. As a result, the affected energy storage cell is preferably cooled in such a way that a thermal runaway of neighboring energy storage cells can be prevented. The cooling system according to the invention thus has the advantage that it can be used both for standard cooling of the energy store in its essentially fault-free operation and for emergency cooling during the thermal runaway of one or more energy storage cells. This has a positive effect on the total weight of one Energy storage, in which such a cooling system is installed. Since the emergency opening device can already be opened by the action of heat and / or pressure, an additional temperature and / or pressure sensor in the energy store can be dispensed with. Rather, the emergency opening device reacts directly and essentially without

Delay. This significantly shortens the reaction time of the cooling system in the event of a thermal runaway, so that a chain reaction can be partially or even completely prevented.

It is particularly advantageous here that no active components, sensors or other electrical components whatsoever are used for the emergency cooling function

Components are required. No additional electrical energy is required for the emergency cooling to function.

The passage can have a circular, elliptical or rectangular cross section. In addition, it can also be conical.

In a first advantageous embodiment of the invention

The emergency opening device comprises a cooling system in the area of the

Passage introduced coolant outlet opening and a die

Closure element closing the coolant outlet opening. This closure element becomes detached from the coolant outlet opening when pressure and / or temperature act, as a result of which the fluid-conducting connection is formed between the volume and the passage and coolant can exit from the volume into the passage. The cooling element can be designed in the form of a plate, the passage being introduced into the cooling element, crossing from a first cooler wall to a second cooler wall of the cooling element which is essentially opposite the first cooler wall.

In order to improve the supply of the coolant from the volume of the cooling element through the coolant outlet opening into the passage and towards the energy storage cell, the coolant outlet opening can be designed in the shape of a nozzle. In a further advantageous embodiment of the cooling system according to the invention, the closure element of the emergency opening device is designed as a plug. The plug can be manufactured as a separate component, which is inserted into the cooling element during the final production of the cooling element

Coolant outlet opening is inserted.

In a further advantageous embodiment of the invention

Cooling system, the plug has a first portion that is in the

Coolant outlet opening is arranged, and a second section which covers the coolant outlet opening at least in sections. A further advantageous embodiment of the cooling system according to the invention provides that the second section covers the coolant outlet opening at least in sections on an outer side of the wall facing the passage. As a result of the action of temperature, the plug can in this case be detached from the coolant outlet opening, for example by melting.

In contrast, a further advantageous embodiment of the cooling system according to the invention provides that the second section the

Coolant outlet opening covered at least in sections on an inner side of the wall facing the volume. If the second section is arranged on an inside of the wall facing the volume, the stopper can, by the action of pressure, in the volume of the

Cooling element pressed in and / or melted by the action of heat.

In a further advantageous embodiment of the cooling system according to the invention, the closure element is designed as an insert which, in sections, forms the wall of the cooling element and delimits the passage. In this case, the insert can also be manufactured as a separate component and inserted into the passage of the cooling element during the final manufacture of the cooling system. Another advantageous embodiment of the cooling system according to the invention provides that the insert is designed as a hollow body. This hollow body has a base surface with a first hollow body opening, a top surface with a second hollow body opening and a jacket connecting the base surface and the top surface to one another. The base area, the top area and the jacket define an inner area of the hollow body. In this embodiment, the hollow body openings are formed from the casing, essentially circumferential latching units, the latching units being formed on a casing outer side facing away from the inner area and at least one die between the latching units

Coolant outlet opening is arranged substantially overlapping melting area.

The insert is inserted or inserted into the passage in such a way that the first hollow body opening is arranged in the region of a first passage opening and the second hollow body opening is arranged in the region of a second passage opening of the passage. The top surface and / or the base surface preferably terminate essentially flush with a cooler wall of the cooling element that is adjacent on both sides of the passage. Essentially flush means that the jacket of the hollow body in the area of the top surface and / or the base surface does not protrude or protrudes only slightly from the passage. This can avoid that between the cooling system and the energy storage cells of the

Energy storage a too large distance or cavity arises, which would hinder the dissipation of heat from the energy storage cells to the cooling system during the standard cooling of the energy storage.

The hollow body can be made of elastomeric plastic for easier insertion of the insert, which is embodied as a hollow body, into the passage. The base area and the top area of the insert are preferably circular, elliptical or rectangular, independently of one another. If both the base and the top surface are circular, the insert can be cylindrical. The shape of the base and the top surface is selected depending on the geometry of the passage. If the passage has a cylindrical and / or conical shape, then an insert in the form of a Flohl cylinder is inserted into the passage.

In the melting range, the jacket preferably has a reduced

Wall thickness that melts or breaks the jacket in

Easier melting range. The melting area preferably runs partially or completely around the jacket of the insert. If the insert is a hollow cylinder, the melting area between the two latching elements can be distributed rotationally symmetrically or in segments around the circumference of the Flohl cylinder. Furthermore, the jacket of the

Insert in the melting area have a taper, so that the melting area occupies an exposed position in the passage.

Another advantageous embodiment of the cooling system according to the invention provides that the locking unit is essentially perpendicular to the

Has jacket outer side protruding and the jacket circumferential projection and at least one elastically deformable latching element. The

The projection and the locking element form a receptacle for an edge of the enclosing either the first or the second passage opening

Wall from. During the final production of the cooling element, the insert is inserted into the passage through the first or the second passage opening. In order to prevent the locking element from hanging on the edge surrounding the respective passage opening or in the

The passage opening remains stuck, the latching element can be deformed due to its elasticity when passing through the respective passage opening. After passing through the respective passage opening, it returns to its original shape. Thus, the elastic facilitates

Deformability of the locking element, the insertion of the hollow body into the Passage. After the edge surrounding the respective passage opening has been received in the receptacle, ie between the projection and the locking element, it is pressed sealingly against the projection by the locking element so that no coolant is removed from the volume of the

Cooling element can emerge via the locking unit.

The latching element can be designed as a flexurally elastic latching collar which partially or completely encloses the jacket of the hollow body. This achieves an optimal fit of the hollow body in the passage.

The tightness between the insert and the passage of the cooling element can be improved in that in a further advantageous

Design of the cooling system according to the invention, a sealing element is assigned to the projection on a side facing the receptacle. The sealing element can in particular be designed as a sealing ring. The

The projection can have a groove running around the jacket on a side facing the receptacle, into which the sealing element is inserted.

In a further advantageous embodiment of the invention

In the battery store, the energy storage cells and the cooling system are arranged with respect to one another in such a way that the second hollow body opening of the insert inserted into the passage is on one of the

Fuse opening facing side of the cooling element is located. In this case, the first hollow body opening is on one of the securing openings

arranged away from the side of the cooling element. Thus, a focal beam emerging from the fuse opening is first through the second

Passed through the hollow body opening, then the interior of the

Deployment and ultimately leaves deployment through the first

Hollow body opening.

So that the coolant contained in the volume and which is under pressure can be directed in the direction of the opened fuse opening during the thermal runaway of the energy storage cell, another provides According to an advantageous embodiment of the cooling system according to the invention, the first hollow body opening has a smaller clear dimension compared to the second hollow body opening. Unless the insert is circular

Comprising a top surface and a circular base surface, the first hollow body opening has a smaller inner diameter compared to the second hollow body opening. In both cases, the jacket can be designed to taper essentially conically from the second hollow body opening to the first hollow body opening and is therefore suitable for insertion into a conically designed passage. Furthermore, the insert in the area of a second latching unit encircling the second hollow body opening can have larger external dimensions compared to a first latching unit encircling the first hollow body opening.

In order to ensure easier insertion of the insert into the passage of the cooling element, the first latching unit in a further advantageous embodiment of the cooling system according to the invention, starting from the first hollow body opening along the jacket, initially has a first latching element and then a first projection. in the

In contrast to this, starting from the second hollow body opening along the jacket, the second latching unit initially has a second projection and then a second latching element. When inserting the insert from the side of the second passage opening into the passage, the first locking element and the second locking element are deformed at the two edges surrounding the passage opening due to their elasticity before the two edges are formed by the locking units

Recordings are recorded and the locking elements return to their original shape.

Another advantageous embodiment of the cooling system according to the invention provides that the closure element is made from plastic, in particular from an elastomer. In particular if the closure element is designed as a separate component that is introduced into the passage, it can be designed as an injection molded part. The wall of the cooling element is advantageous in a further

Design of the cooling system according to the invention made of metal,

preferably formed from sheet metal. Alternatively, the wall of the cooling element can also be made of plastic.

The wall of the cooling element can comprise at least two sheets of metal, in particular aluminum, or a metal alloy, which are preferably connected to one another in the area of the passage, in particular in the area of the coolant outlet opening, for example by welding. At least a first sheet can be used to form the

Passage be formed or machined.

Furthermore, the cooling element can also be designed as a hose cooler which is arranged on a hose carrier. In this case, the

Hose carrier one to the passage of the hose cooler

complementary passage. This means that the passage extends through the hose cooler and the hose carrier. The

The hose cooler is preferably made of plastic, in particular synthetic rubber. The hose carrier can be made of injection-molded plastic and is used to stabilize the hose cooler.

In a further advantageous embodiment of the invention

Cooling system, the closure element and the wall are formed in one piece. One-piece means that the closure element and the

Wall of the cooling element are formed from the same material or that the wall has a coolant outlet opening onto which the closure element has been injected. This closure element can be detached from the wall by the action of heat and / or pressure in order to open the coolant outlet opening in the wall during emergency cooling of the energy storage cells. Another aspect of the invention provides an energy store comprising a plurality of energy storage cells and a cooling system. The

Energy storage cells each have a cell housing and at least one securing opening assigned to the cell housing. The cooling system has at least the aforementioned features of the invention

Cooling system on or one or more features which are the subject of advantageous embodiments of the cooling system according to the invention. The securing opening is each assigned to a passage of a cooling element of the cooling system. The safety opening can be designed as a burst safety device, in particular as a bursting membrane or bursting disc. The burst protection is a predetermined breaking point in the cell housing of the energy storage cell, which the energy storage cell from increased

Internal cell pressure protects it by reaching a critical level

Cell internal pressure bursts and thus an uncontrolled breakup or

Rupture of the cell housing prevented. Such an overpressure can

for example, by ignition or gas-forming decomposition of a solvent mixture contained in the energy storage cell. If the burst protection bursts due to an increased internal pressure in the cell, then in the event of a fire in the energy storage cell, a combustion beam can exit the cell housing in a controlled manner at this point. By the

Safety opening is assigned to the passage, this focal beam can then pass through the passage and be diverted. When the focal beam passes through the passage, the

Emergency opening device opened and thus enables emergency cooling of the thermally continuous energy storage cell. Such an energy store has compared to those known from the prior art

Energy storage has the advantage that no additional emergency cooling system has to be installed in the energy storage in addition to the standard cooling system. As already mentioned, this allows the total weight of the energy store to be significantly reduced. Preferably they are

Energy storage cells of the energy store arranged on the cooling system. A thermal paste can be used between the energy storage cells and the cooling system to improve the thermal conductivity of the Energy storage cells be introduced to the cooling system. The

Energy storage cells are preferably designed as rechargeable battery cells, in particular as lithium-ion battery cells. In the last-mentioned case, the energy store is thus a rechargeable lithium-ion battery. However, the invention is not limited to a rechargeable lithium ion battery as an energy store. The energy store can be used as a drive battery in motor vehicles or as another temporary battery

Energy storage are used. Furthermore, the energy store can also comprise several cooling systems. If an emergency opening device is opened due to thermal runaway of an energy storage cell and the coolant contained in the volume of the affected

Energy storage cell has been at least partially supplied, a first cooling system assigned to this energy storage cell does not have any

sufficient cooling capacity for the standard cooling of the further, still intact energy storage cells assigned to this cooling system. Since the energy store comprises further cooling systems in addition to this first cooling system, these can be further cooling systems

associated energy storage cells are still sufficient

be standard cooled.

An advantageous embodiment of the energy store according to the invention provides that the energy storage cells are arranged on the cooling element, in particular the plate-shaped cooling element, in such a way that a longitudinal axis of the energy storage cells is essentially perpendicular to a cooling surface of the cooling element. In this case, the fuse opening is arranged on a contact surface between the respective energy storage cell and the cooling element. The energy store can have a frame or a frame-like energy storage housing, which the

Energy storage cells in their entirety encloses and one

heat-conducting contact between the energy storage cells and the

Cooling element especially during the standard cooling of the

Ensure energy storage. The energy storage cells can be cylindrical, prismatic or designed as pouch cells.

Some configurations of the cooling system according to the invention or the energy store according to the invention are explained in more detail below with reference to the figures. These show, each schematically:

Fig. 1 shows a first embodiment of an inventive

Cooling system as a schematic sectional view;

Fig. 2 shows a second embodiment of an inventive

Cooling system as a schematic sectional view;

Fig. 3 shows a third embodiment of an inventive

Cooling system as a schematic sectional view;

Fig. 4 shows a fourth embodiment of an inventive

Cooling system as a schematic sectional view;

Fig. 5 shows an embodiment of an inventive

Energy storage device that has a cooling system according to the first

Has embodiment, as a schematic sectional illustration.

FIG. 1 shows a first exemplary embodiment of a cooling system 1 according to the invention as a schematic sectional illustration with a cell bottom 2 of an energy store shown above in a partial view. The cooling system comprises a cooling element 3, which has a wall 31 and one of the

Wall 31 has a limited volume 32 through which a coolant flows.

The cooling element 3 is designed in the present embodiment as a cooler plate made of plastic and has an upper cooler wall 33, a lower cooler wall 34 and the upper cooler wall 33 and the lower cooler wall 34 interconnecting, the cooling element 3 traversing passage 4. The passage 4 comprises a first

Passage opening 41 and a second passage opening 42, both of which are circular in the present exemplary embodiment. Both

Passage openings 41, 42 are enclosed by an edge 411, 421. In the present exemplary embodiment, the first passage opening 41 has a smaller one compared to the second passage opening 42

Inside diameter. Because of this, the passage 4 is tapered from the second passage opening 42 to the first passage opening 41.

The cooling system 1 also has an emergency opening device. In the present exemplary embodiment, this emergency opening device comprises one arranged on the cooling element 3 in the region of the passage 4

Coolant outlet opening 5 and a closure element 6 closing this coolant outlet opening 5. The coolant outlet opening 5 is closed in the present exemplary embodiment, but can be opened in the event of a thermal runaway of the energy storage cell.

In the present exemplary embodiment, the closure element 6 is an insert made of injection-molded plastic, which is designed as a hollow body. This insert 6 has a base surface 61, a top surface 62 and a jacket connecting the base surface 61 and the top surface 62 to one another. The base area 61 and the top area 62 are in the present case

Embodiment formed circular. The base area 61, the

The top surface 62 and the jacket 63 define an inner area 64 of the hollow body 6. The base surface 61 has a first hollow body opening 611 and the top surface 62 has a second hollow body opening 621, the first hollow body opening 611 having a smaller inner diameter compared to the second hollow body opening 621. Thus, the insert 6 is also approximately conical.

On a jacket outer side facing away from the inner region 64, the jacket 63 comprises the first hollow body opening 611 and the second hollow body opening 621 circumferential locking units 7, 8. The jacket 63 has a melting area 631 between the locking units 7, 8. This melting area 631 completely covers the coolant outlet opening 5 and runs radially symmetrically around the circumference of the jacket 63 (not shown in FIG. 1). As a result of the action of heat on the melting area 631 in the event of a thermal runaway of the energy storage cell, this melting area 631 melts and thus opens the coolant outlet opening 5.

The latching units 7, 8 each have a projection 71, 81 that protrudes perpendicular to the outer side of the casing and encircles the casing 63 and each has an elastically deformable latching element 72, 73. One of each

Projections 71, 81 and each one of the elastically deformable

Latching elements 72, 82 form a receptacle 73, 83 for the edge 411, 421 enclosing either the first passage opening 41 or the second passage opening 42. Starting from the first flare body opening 611, the first latching unit 7 initially comprises the first latching element 72 along the jacket 63 and then the first projection 71. In contrast to this, the second latching unit 8, starting from the second flare body opening 621 along the jacket 63, initially has the second

Projection 81 and then the second latching element 82. In the present exemplary embodiment, the two elastically deformable latching elements 72, 82 are designed as a flexurally elastic latching collar which completely encloses the jacket 63 of the flea body 6.

So that no coolant can escape from the volume 32 of the cooling element 3 in the area of the latching units 7, 8, both projections 71, 81 each comprise a sealing element 9, 10, designed as a sealing ring, on a side facing the receptacles 73, 83, which is inserted into a casing 63 circumferential groove 91, 101 is used in this area.

If there is a thermal runaway in the energy storage cell, this leads to an increase in pressure and temperature in the volume of this

Energy storage cell. In the present embodiment, the Cell bottom 2 of this energy storage cell has a securing opening 21, the securing opening 21 being assigned to the passage 4. More precisely, the securing opening 21 and the passage 4 and thus the inner region of the hollow body are arranged in alignment with one another.

The fuse opening 21 is in the present embodiment as

Rupture membrane formed. If the pressure and the temperature exceed a critical value, this safety opening 21 bursts and a focal ray emerges from the interior of the

Energy storage cell. This focal ray first passes through the second hollow body opening 621, then passes the hollow body inner region 64 and leaves the hollow body via the first hollow body opening 611.

Due to the high temperature of the focal beam, it occurs in the

Melting range 631 of the jacket 63 to a melting of the plastic. This opens the coolant outlet opening 5 and the coolant emerges from the volume 32 via the coolant outlet opening 5 into the passage 4.

In order to facilitate melting of the plastic in the melting area 631, the jacket 63 has a taper in the melting area 631. So that the pressurized coolant can be directed in a targeted manner in the direction of the cell bottom 2, the first hollow body opening 611 has a smaller inner diameter than the second hollow body opening 621.

Figure 2 shows a second embodiment of the invention

Cooling system 1 as a schematic sectional illustration. This

The exemplary embodiment differs from the first exemplary embodiment shown in FIG. 1 in that the cooling element 3 is designed as a hose cooler.

This designed as a hose cooler cooling element 3 is on a

Hose carrier 11 applied so that the hose carrier 11 the Hose cooler 3 supports. The passage 4 extends in this

Exemplary embodiment through the hose cooler 3 and the hose carrier 11. The hose cooler 3 likewise comprises a wall 31 which delimits the volume 32 through which the coolant flows. In this exemplary embodiment, the wall 31 and the closure element 12 are made in one piece from elastomer

Material, in the present case made of synthetic rubber. The

Closure element 12 is arranged in the area of passage 4 in such a way that when it comes into contact with the focal beam, it moves away from the

Wall 31 detaches or melts and the coolant outlet opening 5 opens. In this exemplary embodiment, the coolant outlet opening 5 is distributed radially symmetrically around the circumference of the passage 4 (not shown in FIG. 2).

Figure 3 shows a third embodiment of the invention

Cooling system 1 as a sectional view. This third exemplary embodiment differs from the first exemplary embodiment shown in FIG. 1 and the second exemplary embodiment shown in FIG. 2 in that the cooling element 3 is designed as a cooler plate made of two metal sheets 13, 14 made of aluminum, which in the area of their joint or their connection point 15 are firmly connected to one another by welding.

The first cooler plate 13 has a in the area of the passage 4

Coolant outlet opening 5 which is closed with a closure element 16 designed as a plug. In the present embodiment, the plug 16 is made of plastic. The stopper 16 has a first section 161 which is arranged in the coolant outlet opening 5, and a second section 162 which completely covers the coolant outlet opening 5. The second section 162 of the plug 16 is arranged on an inside of the wall 31 facing the volume 32.

In the event of a thermal runaway of the energy storage cell and an associated exit of the focal beam from the open

Securing opening 21 in the passage 4 is thereby opened to the Plug 16 acting pressure of the plug 16 is pressed into the volume 32 of the cooling element 3.

Figure 4 shows a fourth embodiment of the invention

Cooling system 1 as a sectional view. This fourth exemplary embodiment differs from the third exemplary embodiment shown in FIG. 3 in that the second section 162 of the plug 16 is located on an outer side of the wall 31 facing the passage

Coolant outlet opening 5 completely covered. In the event of a thermal runaway of the energy storage cell and an associated exit of the focal beam from the opened securing opening 21 into the passage 4, the heat acting on the plug 16 as a result of the

Focal jet of the stopper 16 melted and the coolant outlet opening 5 opened.

Figure 5 shows an embodiment of an inventive

Energy store 17. This energy store 17 comprises a cooling system 1 according to the first embodiment, on which a plurality of energy storage cells 18, 19 are arranged in relation to one another so that a longitudinal axis of the energy storage cells 18, 19 is essentially perpendicular to a cooling surface of the cooling element 3 designed as a cooler plate (The present Figure 4 shows only two of the energy storage cells).

Each energy storage cell 18, 19 is enclosed by a cell housing 181, 191, the cell base 2 being a part of this cell housing 181, 191. In the error-free operation of the energy storage device, each

Energy storage cell 18, 19 cooled by the cooling system 1 along the cooling surface. This means that the cooling system 1 serves as standard cooling for the energy store 17.

To improve the cooling performance, a heat-conducting paste can be introduced between the cell bottom 2 and the cooling element 3. This thermal paste should not clog the respective passages 4 in which the insert 6 is arranged. The energy storage cells 18, 19 and the cooling system 1 are enclosed by an energy storage housing 22, which ensures a heat-conducting contact between the energy storage cells 18, 19 and the cooling surface of the cooling system 1. The energy storage housing 22 is in

present embodiment formed like a frame. Each

Energy storage cell 18, 19 has a securing opening 21 in the area of its cell bottom 2. For the interaction of the energy store 17 and the cooling system 1 during a thermal runaway

Energy storage cell 18, 19, it is essential in the present exemplary embodiment that the securing opening 21 of each energy storage cell 18, 19 and the respective passage 4 are arranged in alignment with one another. The cooling system 1 can thus use the energy store 17 or the energy storage cells 18, 19 contained in it both in error-free operation of the

Energy storage 17 and optimally cool during emergency cooling of one or more energy storage cells during the thermal runaway.

In the present exemplary embodiment, the energy storage cells 18, 19 are designed as rechargeable lithium-ion battery cells. The energy store 17 is thus a rechargeable lithium-ion battery.

Claims

1. Cooling system (1) for an energy store, comprising at least one cooling element (3) which has a wall (31) and one of the

Wall (31) limited and bleed with a coolant

Volume (32), at least one passage (4) being introduced into the cooling element (3), which is at least partially separated from the volume (32) by the wall (31), with an emergency opening device being assigned to the passage (4) which opens when exposed to heat and / or pressure and thus becomes a flow-conducting one

Establishes connection between the volume (32) and the passage (4).

2. Cooling system according to claim 1, characterized in that the

Emergency opening device one in the area of the passage (4)

introduced coolant outlet opening (5) and a die

Comprises a closure element (6, 12, 16) which closes the coolant outlet opening (5). 3. Cooling system according to claim 2, characterized in that the

Closure element is designed as a stopper (16).

4. Cooling system according to one of claims 2 or 3, characterized

characterized in that the plug (16) has a first section (161) which is arranged in the coolant outlet opening (5), and a second section (162) which the

Coolant outlet opening (5) covered at least in sections.

5. Cooling system according to claim 4, characterized in that the second section (162) has the coolant outlet opening (5) on one of the

Passage (4) facing outside of wall (32) covered at least in sections. Cooling system according to claim 4, characterized in that the second section (162) the coolant outlet opening (5) on one of the

Volume (32) facing inside of the wall (3) at least partially covered.

Cooling system according to claim 2, characterized in that the closure element is designed as an insert (6) which

in sections the wall (31) of the cooling element (3) forms and delimits the passage (4).

Cooling system according to Claim 7, characterized in that the insert (6) is designed as a hollow body which traverses the passage (4) and which has a base surface (61) with a first

Hollow body opening (611), a top surface (62) with a second hollow body opening (621) and a jacket (63) connecting the base surface (61) and the top surface (62) to one another, the base surface (61), the top surface (62) and the jacket (63) define an inner region (64) of the hollow body (6) and the hollow body openings (611, 621) essentially encircling latching units (7, 8) being formed from the jacket (63), the

Latching units (7, 8) are formed on an outer side of the jacket facing away from the inner region (64) and wherein between the

Latching units (7, 8) at least one melting area (631) that essentially covers the coolant outlet opening (5) is arranged.

Cooling system according to Claim 8, characterized in that the latching unit (7, 8) has a projection (71, 81) which protrudes substantially perpendicular to the outer side of the casing and encircles the casing (63) and at least one elastically deformable latching element (72, 82), wherein the projection (71, 81) and the latching element (72, 82) form a receptacle (73, 83) for an edge (411, 421) which either has a first passage opening (41) or a second

Passage opening (42) of the passage (4) encloses.

10. Cooling system according to claim 9, characterized in that the projection (71, 81) is assigned a sealing element (9, 10) on a side facing the receptacle (73, 83).

11. Cooling system according to one of claims 8 to 10, characterized

characterized in that the first hollow body opening (611) has a smaller clear dimension compared to the second hollow body opening (621).

12. Cooling system according to one of claims 2 to 11, characterized

characterized in that the closure element (6, 12, 16) is made of plastic.

13. Cooling system according to one of claims 1 to 12, characterized

characterized in that the wall (31) of the cooling element (3) is made of metal or plastic.

14. Cooling system according to one of claims 2 to 13, characterized

characterized in that the closure element (12) and the

Wall (31) of the cooling element (3) are designed in one piece, the closure element (12) for producing the flow-conducting

Connection between the volume (32) and the passage (4) can be detached from the wall (31) by the action of heat and / or pressure.

15. Energy store (17), comprising a plurality of

Energy storage cells (18, 19) each having a cell housing (181, 191) and at least one associated with the cell housing (181, 191)

Have fuse opening (21) and at least one cooling system (1) according to at least one of the preceding claims, wherein the

Securing opening (21) each with a passage (4)

The cooling element (3) of the cooling system (1) is assigned.