CN217507459U - Battery and assembly for battery - Google Patents

Abstract

The utility model provides an assembly for battery including the thermal-insulated cooling fin of X-Y conduction Z. An assembly for a battery comprising: at least two electrochemical cells with a pressure pad disposed therebetween; a multi-layer cooling fin disposed on a side of the at least one electrochemical cell opposite the pressure pad, the multi-layer cooling fin comprising a thermal insulation layer, a first heat sink foil layer disposed on a first side of the thermal insulation layer, a second heat sink foil layer disposed on a second side of the thermal insulation layer; and a cooling plate substantially perpendicular to and in thermal contact with the plurality of layers of cooling fins.

Description

Battery and assembly for battery

Cross Reference to Related Applications

This application claims priority and benefit from U.S. provisional application No. 63/086,148, filed on 1/10/2020, which is incorporated herein by reference in its entirety.

Technical Field

The present disclosure relates to an assembly for a battery, in particular for delaying or preventing thermal runaway in a lithium ion battery. The present disclosure also relates to methods for manufacturing assemblies for batteries and batteries including assemblies for batteries.

Background

Due to the growth in applications such as electric vehicles and grid energy storage systems, as well as other multi-cell battery applications such as electric bicycles, uninterruptible power supply battery systems, and lead-acid replacement batteries, the demand for electrochemical energy storage devices such as lithium ion batteries is growing. For large applications such as grid storage and electric vehicles, multiple electrochemical cells connected in series and parallel arrays are often used. Once a cell is in a thermal runaway mode, the heat generated by the cell may cause a thermal runaway propagation reaction in the adjacent cell, possibly resulting in a cascading effect that can ignite the entire cell.

Although attempts to reduce the flammability of such batteries have been considered, most of them have disadvantages. For example, it has been considered to change the electrolyte by adding flame retardant additives or to use an electrolyte that is not flammable per se, but these methods may negatively affect the electrochemical performance of the lithium ion cell. Other methods of preventing cascade thermal runaway include: increased amounts of insulation are included between cells or groupings of cells to reduce the amount of heat transfer during thermal events. However, these methods may limit the upper limit of the energy density that can be achieved.

As the demand for batteries with reduced risk of thermal runaway increases, there is a corresponding need for materials for batteries that prevent or delay diffusion of heat, energy, or both to surrounding cells.

SUMMERY OF THE UTILITY MODEL

Disclosed herein is an assembly for a battery, including: at least two electrochemical cells with a pressure pad disposed therebetween; a multi-layer cooling fin disposed on a side of the at least one electrochemical cell opposite the pressure pad, the multi-layer cooling fin comprising a thermal insulation layer, a first heat sink foil layer disposed on a first side of the thermal insulation layer, and a second heat sink foil layer disposed on a second side of the thermal insulation layer; and a cooling plate substantially perpendicular to and in thermal contact with the plurality of layers of cooling fins.

In one aspect, also included is a battery having the above-described assembly for a battery.

The above described and other features are exemplified by the following figures, detailed description, and appended claims.

Drawings

The following drawings are provided to illustrate exemplary aspects of the present disclosure. The figures illustrating examples are not intended to limit devices made in accordance with the present disclosure to the materials, conditions, or process parameters set forth herein.

FIG. 1 is a schematic representation of a prior art assembly for a battery including an electrochemical cell and cooling fins;

fig. 2 is a diagrammatic view of an assembly for a battery in one aspect of the present disclosure including an electrochemical cell and cooling fins;

FIG. 3 is an illustration of an aspect of an assembly for a battery of the present disclosure;

FIG. 4 is an illustration of an aspect of a multilayer cooling fin of the present disclosure; and

FIG. 5 is an illustration of a cooling fin having coolant channels.

Detailed Description

Preventing thermal runaway in a battery comprising a plurality of cells is a challenge because cells adjacent to a cell experiencing thermal runaway can absorb enough energy from an event to raise them above their designed operating temperature, triggering the adjacent cells to also enter thermal runaway. This propagation of an event causing thermal runaway may cause a chain reaction in which the storage device enters a series of cascaded thermal runaway as a unit transfers heat to an adjacent unit.

One way to prevent such a cascading thermal runaway event from occurring is to place cooling fins between and preferably in contact with adjacent cells or groups of cells for thermal management during cell operation. In battery designs, the cooling fins may transfer energy from the cell(s) to a cooling plate that extends substantially perpendicular to the cell and the cooling fins. However, prior art cooling fins, typically made of aluminum, also have a high Z-direction thermal conductivity, which can transfer heat from a cell, such as a pocket cell, to an adjacent cell. This heat transfer from unit 100 to adjacent unit 101 through a prior art aluminum cooling fin 200 assembled with a cooling plate 300 is shown in fig. 1. The arrows show the Z-direction heat transfer from cell 100 to the adjacent cell 101.

As used herein, a "cooling fin" is a structure for dissipating heat from a broad face of an electrochemical cell where most of the heat is available for dissipation. A single cooling fin may be located between the two units. The thin cooling fins may have a series of channels therethrough. The cooling fins may be snap-fit in place. The cooling fins may occupy a small space and provide cooling directly to at least one face of the electrochemical cell (depending on the configuration). Exemplary cooling fins are manufactured by Dana holdings Corporation.

To prevent a cascading thermal runaway event, the multiple layers of cooling fins may reduce the thermal conductivity in the Z-direction, thereby reducing heat transfer from a cell to an adjacent cell. The multilayer cooling fins may also improve the fire resistance of the cell.

Accordingly, assemblies for batteries and batteries including multilayer cooling fins are described herein. As used herein, an electrochemical cell (or "cell") is the basic unit of a battery that includes an anode, a cathode, and an electrolyte. "cell array" refers to an assembly of two or more (e.g., two, five, twenty, fifty, or more) electrochemical cells. The cell or cell array associated with the layers of cooling fins and optionally another battery component (e.g., separator, current collector, housing such as a flexible bag, etc.) is referred to herein as an "assembly for a battery. The assembly for a battery and the battery may include a single electrochemical cell, a single cell array, or a plurality of cell arrays.

A wide variety of electrochemical cell types may be used, including bag cells, prismatic cells, or cylindrical cells. The individual cells or arrays of cells may be in a flexible housing, for example in a bag cell. In one aspect, the cells are lithium ion cells, such as lithium iron phosphate, lithium cobalt oxide, or other lithium metal oxide cells. Other types of cells that may be used include nickel metal hydride, nickel cadmium, nickel zinc, or silver zinc.

Multilayer cooling fins and assemblies for batteries and batteries including multilayer cooling fins are described herein. As shown in fig. 2, the multilayer cooling fin 400 absorbs thermal energy from the unit 100 (e.g., a bag-type unit) to the adjacent unit 101, thereby preventing heat transfer from the unit 100 to the adjacent bag-type unit 101. The cooling plate 300 is in thermal communication with the multi-layer cooling fin 400. The arrows show the direction of heat transfer from the unit 100 to the multilayer cooling fins 400 acting as Z-direction insulators, thereby reducing the risk of thermal runaway.

In one aspect, as shown in fig. 3, an assembly for a battery 1000 includes: at least two electrochemical units 500, between which at least two electrochemical units 500 a pressure pad 600 (also called compression pad) is disposed; and a plurality of layers of cooling fins 400 disposed substantially on opposite sides of each electrochemical cell 500 substantially perpendicular to the cooling plate 300. The cooling plate 300 is in thermal communication with the multi-layer cooling fin 400. As used herein, "substantially perpendicular" refers to an angle of 90 degrees and includes angles other than 90 degrees that may fall within manufacturing tolerances (e.g., ± 5 degrees or ± 2 degrees or ± 1 degree) for components of a battery.

The electrochemical cells include prismatic cells, pouch cells, cylindrical cells, etc., preferably pouch cells. In one aspect, the electrochemical cell is a lithium ion cell.

As shown in FIG. 4, multi-layer cooling fin 400 includes a first heat sink foil layer 40 disposed on a first side 42 of a thermal insulation layer 44. A second heat sink foil layer 46 is disposed on a second side 48 of the thermal insulation layer 44.

The first and second foil layers 40, 46 each independently have a thickness of 0.0005 inches to 0.039 inches, preferably 0.001 inches to 0.005 inches, and the first and second foil layers 40, 46 each independently comprise a metal having a high thermal conductivity, such as copper, aluminum, copper alloys, aluminum alloys, boron nitride, aluminum nitride, non-woven carbon nanotube sheets or tapes (e.g.,

) Other carbon nanotube films or graphite films.

In an aspect, the first and/or second heat sink foil layers of the cooling fin may include a plurality of channels such that coolant may pass through the foil layers. For example, grooves may be punched in a first foil or plate and optionally in a second foil or plate, which are then joined to provide cooling channels, for example by a nickel brazing process. FIG. 5 is a schematic view of an exemplary cooling fin including coolant channels.

Preferably, the foil is aluminium or an aluminium alloy. The first foil layer and the second foil layer act as heat sink layers.

The insulating barrier 44 has a low thermal conductivity (Tc) such as 0.01W/m K to 0.09W/m K at 23 ℃, has a high latent heat of fusion such as 70J/g to 350J/g, or has both a low thermal conductivity (Tc) such as 0.01W/m K to 0.09W/m K at 23 ℃ and a high latent heat of fusion such as 70J/g to 350J/g, to retard thermal runaway. Exemplary thermal insulation layers include aerogel, mica, foams such as polyurethane or silicone foams, cork or fiberglass.

Aerogels are open-celled solid substrates comprising a network of interconnected nanostructures with a porosity of greater than 50 vol%, more preferably greater than 90 vol%. Aerogels can be obtained from gels by replacing the liquid component of the gel with a gas or by drying a wet gel, for example by supercritical drying. Exemplary aerogels include: polymeric aerogels, such as poly (vinyl alcohol), urethane, polyimide, and polyacrylamide aerogels; polysaccharide aerogels, including chitin and chitosan aerogels; and inorganic ceramic aerogels such as aluminum oxide and silica aerogels.

Exemplary mica layers may include epoxy, silicone, phenolic, and the like to enhance the strength of the mica layer.

Exemplary foams for the thermal insulation layer include polyurethane and silicone foams as described below.

Exemplary cork materials include both natural cork and synthetic cork.

Exemplary fiberglass layers include glass fibers in a polymer matrix, such as a thermoset or thermoplastic polymer matrix. Exemplary thermosetting polymers include epoxy, polyester, and vinyl ester.

In one aspect, the thermal insulation layer may include a filler, which may advantageously provide thermal resistance, heat absorption, or thermal deflection characteristics, such as when the thermal insulation layer includes polyurethane foam. Exemplary fillers include inorganic or ceramic materials such as alumina trihydrate, silica, talc, calcium carbonate, clay, alumina, aluminum nitride (AlN), Boron Nitride (BN), silicon nitride, ZnO, SiC, or BeO. In one aspect, the filler may comprise a binder, such as a polymeric binder.

The insulating barrier 44 has a thickness of 0.002 inches to 0.039 inches, preferably 0.006 inches to 0.020 inches.

Depending on the material used for the thermal insulation layer, the first and second foil layers may be adhered to the thermal insulation layer using an adhesive, a lamination process, or casting. A process such as a roll over roll, a knife over roll, a reverse roll, a slot die, or a gravure process may be used. In one aspect, when the thermal insulation layer comprises polyurethane foam, the polyurethane foam may be cast onto one or both of the foil layers.

When an adhesive is used, the adhesive layer may have a thickness of 0.00025 inch to 0.010 inch or a thickness of 0.0005 inch to 0.003 inch. A wide variety of binders known in the art may be used. For example, the adhesive layer may independently comprise a polyester adhesive, a polyvinyl fluoride adhesive, an acrylic or methacrylic adhesive, or a silicone adhesive. In one aspect, the adhesive is a silicone adhesive. Solvent casting, hot melt and two part adhesives may be used.

As shown in fig. 3, it may be advantageous to use a pressure pad 600 in combination with multiple layers of cooling fins. Of course, the pressure pad may be located at other locations within the cell.

In one aspect, the pressure pad can have a thickness of 0.010 to 0.500 inch (254 to 12,700 μm) and comprise a compressible material having reliable consistent compression set (c-set) and stress relaxation resistance over a wide temperature range. Exemplary materials of this type include polyurethane foams or silicone foams (e.g., available from Rogers, Inc.)

Polyurethane foams or

Silicone foam). Other compressible materials that may be used as pressure pads are those described herein. As used herein, "compressible" refers to the elastomeric properties whereby a material compresses under pressure and returns to its original state when the pressure is released.

A compressible pressure pad may be selected that has the characteristics of providing pressure management to the cell and allowing the compressible pressure pad to replace or supplement the pad as described above. In particular, a compressible pressure pad is selected that provides one or more of reliable and consistent c-set resistance and stress relaxation performance over a wide temperature range (e.g., -15 ℃ to 120 ℃). The compressible pressure pad may have a compression set at 158 ° F (70 ℃) of less than 10%, preferably less than 5%, measured according to ASTM D3574-95 test D. In certain aspects, the compressible pressure pad can have a force retention of greater than 50% measured at 70 ° F (21 ℃) for 168 hours according to ISO 3384. The compressible pressure pad may have a thickness effective to provide the desired pressure management. For example, the compressible pressure pad can have an uncompressed thickness of 250 μm to 15,000 μm or 0.020 inches to 0.500 inches (508 μm to 12,700 μm) or 0.040 inches to 0.157 inches (1,016 μm to 3,988 μm).

In one aspect, the pressure pad is a compressible material such as an elastomer or rubber as described above, particularly vinyl acetate (EVA), thermoplastic elastomer (TPE), EPR or EPDM; or a polymer foam.

In one aspect, the compressible pressure pad is a compressible polymer foam. As used herein, "foam" refers to a material having a porous (i.e., cellular) structure. Exemplary compressible foams have less than 65 pounds per cubic foot (pcf) (1,041 kilograms per cubic meter (kg/m) ³ ) Preferably less than or equal to 55pcf (881 kg/m) ³ ) Or preferably not more than 25pcf (400 kg/m) ³ ) The density of (c). The compressible polymeric foam may have a void volume content of at least 5% to 99%, preferably greater than or equal to 30%, based on the total volume of the foam.

The polymeric materials described above may be used as compressible polymeric foams. As described above in connection with polymer fibers and foams, optional additives may be present in the composition used in the manufacture of the compressible polymer foam. In one aspect, the compressible polymer foam has 5 pounds per cubic foot (lb/ft) ³ ) To 30 pounds per cubic foot (lb/ft) ³ )(80kg/m ³ To 481kg/m ³ ) Density of 0.5lb/in measured according to ASTM D3574-95 test C ² To 100lb/in ² (351.5 kilograms per square meter to 70,307 kilograms per square meter (kg/m) ² ) 25% compression of)Force Deflection (CFD), and compression set at 158 ° F (70 ℃) of less than 10%, preferably less than 5%, measured according to ASTM D3574-95 test D. Preferably, the compressible polymer foam is a polyurethane or silicone foam having the aforementioned properties.

In one aspect, the compressible polymer foam included is an open-cell, low modulus polyurethane foam that can have: an average cell size of 50 μm to 250 μm as may be measured, for example, according to ASTM D3574-95; 5lb/ft ³ To 50lb/ft ³ (80 kg/m ³ To 800.9kg/m ³ ) Preferably 6lb/ft ³ To 25lb/ft ³ (96kg/m ³ To 400kg/m ³ ) (ii) a density of (d); a compression set at 158 ° F (70 ℃) of less than 10% as measured according to ASTM D3574-95 test D; and a force deflection between 1 pound per square inch (psi) and 250 pounds per square inch (psi) (7 kilopascals (kPa) to 1724 kilopascals (kPa)). The compressible polyurethane foam may be made from compositions known in the art. Suitable compressible polyurethane foams are available from Rogers corporation of Wood Stock, Connecticut

4700 (e.g.,

evextended 4701-43RL) under the name. These compressible polyurethane foams can be formulated to provide a range of excellent properties, including resistance to compression set. Foams with good compression set resistance provide cushioning and retain their original shape or thickness under load for long periods of time.

In another aspect, the compressible polymer foam is a silicone foam comprising polysiloxane. In one aspect, the silicone foam is generated as a result of the reaction between water and hydride groups in the polysiloxane polymer precursor composition and the consequent release of hydrogen gas. The reaction is typically catalyzed by a noble metal, preferably a platinum catalyst. The catalyst may be deposited on an inert support such as silica gel, alumina or carbon black. Various platinum catalyst inhibitors may also be used to control the kinetics of the blowing and curing reactions in order to control the porosity and density of the silicone foam. Examples of such inhibitors include polymethylvinylsiloxane cyclics and alkynols. These inhibitors should not interfere with foaming and curing in a way that disrupts the foam.

In one aspect, the polysiloxane polymer has a viscosity of 100 poise to 1,000,000 poise at 25 ℃ and has chain substituents such as hydride, methyl, ethyl, propyl, vinyl, phenyl, and trifluoropropyl. The end groups on the polysiloxane polymer can be hydride, hydroxyl, vinyl, vinyldiorganosiloxy, alkoxy, acyloxy, allyl, oximo, aminooxy, isopropenoxy, epoxy, mercapto or other known reactive end groups. Silicone foams can also be produced by using several polysiloxane polymers, each having a different molecular weight (e.g., bimodal or trimodal molecular weight distribution), so long as the viscosity of the composition is within the values specified above. It is also possible to have several polysiloxane base polymers with different functional or reactive groups in order to produce the desired foam. In one aspect, the polysiloxane polymer comprises 0.2 moles of hydride (Si-H) groups per mole of water.

Methods for the manufacture of compressible polymer foams are generally known. The foam may be mechanically frothed, physically or chemically frothed, or both. Polyurethane foams can be made by casting mechanically frothed compositions. In particular, reactive precursors of polyurethane may be mixed and mechanically foamed, then cast to form a layer and cured.

In the production of silicone foams, the reactive components of the precursor composition are stored in two packages, one package containing a platinum catalyst and the other package containing a polysiloxane polymer containing hydride groups, which prevents premature reaction. In another method of production, the polysiloxane polymer is introduced into an extruder along with conductive particles, water, physical blowing agent (if desired), and other desired additives. The platinum catalyst was then metered into the extruder to initiate the foaming and curing reaction. Physical blowing agents such as liquid carbon dioxide or supercritical carbon dioxide in combination with chemical blowing agents such as water can produce foams of much lower density. In yet another method, a liquid silicone component is metered, mixed, and dispensed into a device such as a die or continuous coating line. Then, foaming occurs in the mold or on the continuous coating line.

As shown in fig. 3, the multilayer cooling fin 400 is provided in an assembly for a battery in a state of being positioned in a vertical direction. The multiple layers of cooling fins may be arranged so that their broad surfaces face the surfaces of the cells. The heat transferred from the unit to the multi-layered cooling fin 400 may be directly transferred to the cooling plate 300 through the lower end of the multi-layered cooling fin 400.

Exemplary materials for the cooling plate 300 include aluminum and copper.

Set forth below are non-limiting aspects of the present disclosure.

Aspect 1: an assembly for a battery, comprising: at least two electrochemical cells with a pressure pad disposed therebetween; a multi-layer cooling fin disposed on a side of at least one electrochemical cell opposite the pressure pad, the multi-layer cooling fin comprising a thermal insulation layer, a first heat sink foil layer disposed on a first side of the thermal insulation layer, and a second heat sink foil layer disposed on a second side of the thermal insulation layer; and a cooling plate substantially perpendicular to and in thermal contact with the multilayer cooling fins.

Aspect 2: the assembly for a battery of aspect 1, wherein the electrochemical cell comprises a pouch cell and further comprising a pouch encasing the electrochemical cell.

Aspect 3: the assembly for a battery of any of the preceding aspects, wherein the first and second heat sink foil layers each independently have a thickness of 5 to 1000 microns.

Aspect 4: the assembly for a battery of any of the preceding aspects wherein the first and second heat dissipating foil layers each independently comprise a foil, a woven or non-woven fiber mat, or a polymer foam.

Aspect 5: the assembly for a battery of any one of the preceding aspects, wherein the first heat sink foil layer, the second heat sink foil layer, or both the first and second heat sink foil layers comprise coolant channels.

Aspect 6: the assembly for a battery of any of the preceding aspects, wherein the thermal insulation layer has a thickness of 50 to 15,000 micrometers or a thickness of 50 to 5,000 micrometers.

Aspect 7: the assembly for a battery of any of the preceding aspects, wherein the thermal insulation layer has a thermal conductivity of 0.01W/mK to 0.09W/mK at 23 ℃, the thermal insulation layer has a heat of fusion of 70J/g to 350J/g, or the thermal insulation layer has a thermal conductivity of 0.01W/m K to 0.09W/m K at 23 ℃ and has a heat of fusion of 70J/g to 350J/g, preferably, wherein the thermal insulation layer has a thermal conductivity of 0.01W/mK to 0.09W/mK at 23 ℃, the thermal insulation layer has a heat of fusion of 70J/g to 350J/g, or the thermal insulation layer has a thermal conductivity of 0.01W/m K to 0.09W/m K at 23 ℃ and has a heat of fusion of 70J/g to 350J/g.

Aspect 8: the assembly for a battery of any one of the preceding aspects, wherein the thermal insulation layer is a solid layer.

Aspect 9: the assembly for a battery of any of the preceding aspects, wherein the thermal insulation layer is a polymer foam.

Aspect 10: the assembly for a battery of any of the preceding aspects, wherein the thermal insulation layer further comprises a filler.

Aspect 11: the assembly for a battery of any of the preceding aspects, wherein the pressure pad comprises a polymer foam.

Aspect 12: a battery, comprising: the assembly for a battery according to any one of the preceding aspects; and a housing at least partially enclosing the assembly for a battery.

The compositions, methods, and articles described herein can alternatively comprise, consist of, or consist essentially of any suitable material, step, or component disclosed herein. The compositions, methods, and articles of manufacture may additionally or alternatively be formulated to be free or substantially free of any material(s) (or substance (s)), step(s), or component(s) that are not otherwise necessary to achieve the function or purpose of the composition, method, and article.

The terms "a" and "an" do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. The term "or" means "and/or" unless the context clearly dictates otherwise. Throughout the specification, reference to "one aspect," "another aspect," or the like, means that a particular element (e.g., feature, structure, step, or characteristic) described in connection with the aspect is included in at least one aspect described herein, and may or may not be present in other aspects. In addition, it should be understood that the described elements may be combined in any suitable manner in the various aspects.

When an element such as a layer, film, region, or substrate is referred to as being "on" or "disposed on" another element, it is adjacent to and can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "in contact with" another element, there are no intervening elements present. By "in thermal contact" is meant that the two elements may be directly on each other, or there may be an intermediate layer that transmits heat. In addition, when an element such as a layer, film, region, or substrate is referred to as being "on" or "directly on" another element, all or a portion of the element may be adjacent to all or a portion of the other element.

Unless otherwise indicated herein, all test criteria are the latest criteria valid by the date of filing of the present application, or if priority is required, the latest criteria valid by the date of filing of the earliest priority application in which the test criteria appeared.

The endpoints of all ranges directed to the same component or property are inclusive of the endpoint, independently combinable, and inclusive of all intermediate points and ranges. For example, a range of "up to 25 wt% or up to 5 wt% to 20 wt%" includes the endpoints and all intermediate values of the range of "5 wt% to 25 wt%", e.g., 10 wt% to 23 wt%, etc. The terms "first," "second," and the like, as well as "primary," "secondary," and the like, as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The term "a combination thereof" or "at least one" means that the list includes each element individually, a combination of two or more elements in the list, and a combination of at least one element in the list with similar elements not specified. Further, the term "combination" includes blends, mixtures, alloys, reaction products, and the like.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

All cited patents, patent applications, and other references are incorporated herein by reference in their entirety. However, if a term in the present application contradicts or conflicts with a term in the incorporated reference, the term from the present application takes precedence over the conflicting term from the incorporated reference.

In the drawings, the widths and thicknesses of layers and regions are exaggerated for clarity of illustration and convenience of explanation. In the drawings, like numbering represents like elements.

Exemplary embodiments are described herein with reference to cross-sectional illustrations that are schematic illustrations of idealized embodiments. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region shown or described as flat may generally have rough and/or nonlinear features. Further, the acute angles shown may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the appended claims.

While certain aspects have been described, alternatives, modifications, variations, improvements, and substantial equivalents, which are or may be presently unforeseen, may arise to applicants or others skilled in the art. Accordingly, the appended claims as filed and as they may be amended are intended to embrace all such alternatives, modifications, variations, improvements, and substantial equivalents.

Claims (11)

1. An assembly for a battery, comprising:

at least two electrochemical cells with a pressure pad disposed therebetween;

a multi-layer cooling fin disposed on a side of at least one electrochemical cell opposite the pressure pad, the multi-layer cooling fin comprising:

a heat-insulating layer,

a first heat sink foil layer disposed on a first side of the thermal insulation layer, an

A second heat sink foil layer disposed on a second side of the thermal insulation layer; and

a cooling plate substantially perpendicular to and in thermal contact with the plurality of layers of cooling fins.

2. The assembly for a battery of claim 1, wherein the electrochemical cell comprises a pouch cell and further comprising a pouch encasing the electrochemical cell.

3. The assembly for a battery of claim 1 or 2, wherein the first and second heat sink foil layers each independently have a thickness of 5 to 1000 microns.

4. The assembly for a battery of claim 1 or 2 wherein the first and second heat sink foil layers each independently comprise a foil, a woven or non-woven fiber mat, or a polymer foam.

5. The assembly for a battery of claim 1 or 2 wherein the first heat sink foil layer, the second heat sink foil layer, or both the first heat sink foil layer and the second heat sink foil layer comprise coolant channels.

6. The assembly for a battery according to claim 1 or 2, wherein the thermal insulating layer has a thickness of 50 to 15,000 micrometers or a thickness of 50 to 5,000 micrometers.

7. The assembly for a battery of claim 1 or 2, wherein the thermal insulation layer has a thermal conductivity of 0.01W/m K to 0.09W/m K at 23 ℃, the thermal insulation layer has a heat of fusion of 70J/g to 350J/g, or the thermal insulation layer has a thermal conductivity of 0.01W/m K to 0.09W/m K at 23 ℃ and has a heat of fusion of 70J/g to 350J/g.

8. The assembly for a battery according to claim 1 or 2, wherein the thermal insulation layer is a solid layer.

9. The assembly for a battery of claim 1 or 2, wherein the thermal insulation layer is a polymer foam.

10. The assembly for a battery of claim 1 or 2, wherein the pressure pad comprises a polymer foam.

11. A battery, comprising:

an assembly for a battery according to any one of the preceding claims; and

a housing at least partially enclosing the assembly for a battery.

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