Curing of thermal paste in installation position

Abstract

System (1) for providing an even distribution of waste heat in a battery set comprising: the battery pack; at least one cooling plate located between two cells (2) of the battery pack extends, wherein the cooling plate has an “L” shape, comprising a lower, longitudinally arranged coolant reservoir (6) section (8) and an upper section (5) arranged along the cell height; a coolant reservoir (6) coupled to the cooling plate via a deformable thermal paste (4) so ​​that heat can be conducted between them, wherein the coolant reservoir (6) contains a coolant flow in the form of a liquid or a gas; a support structure (7) between the battery pack and the coolant reservoir (6); and wherein the deformable thermal paste (4) in the form of a liquid and / or a gel can be placed within the support structure and is configured to fill the space between the coolant reservoir (6) and each cell (2) of the to be fluid in the battery pack, so that there is constant thermal contact between an entire lower surface of each cell (2) of the battery pack and an upper side of the coolant reservoir (6), and wherein the deformable thermal paste (4) maintains constant thermal contact by cross-linking, which reduces the fluidity of the deformable thermal paste (4) and provides an even distribution of waste heat by dissipating the waste heat from each of the cells (2) to the coolant reservoir (6), wherein the deformable thermal paste (4) comprises a cross-linked condensation polymer, wherein the deformable thermal paste (4) is part of a formulation, wherein the formulation comprises polydimethylsiloxane, boron nitride, melamine, a processing aid and a ceramic, and the formulation includes: from 0.1 to 50 wt% boron nitride; from 0.05 to 0.10 wt% melamine; from 0.05 to 0.1 wt.% processing aid and the combined ceramic materials; and the remaining residue is polydimethylsiloxane.

Description

TECHNICAL AREA

[0001] This application relates generally to the distribution of waste heat in a vehicle battery pack. More specifically, the application concerns methods and devices for enabling the uniform distribution of waste heat in the vehicle battery pack or other applications that require heat distribution via a deformable thermal paste. BACKGROUND

[0002] Battery-powered vehicles offer significant advantages over conventional modes of transport. However, several technical challenges still need to be overcome to ensure optimal use of the technology. Current products on the market are limited, for example, by range, structural stability, and inefficient heat dissipation from the battery pack.

[0003] JP 2014- 192 120 A discloses a battery pack in which a battery module is attached to a connector.

[0004] WO 2011 / 061931A1 discloses an electrical storage device in which sufficient heat dissipation effects can be achieved without increasing the size more than necessary.

[0005] DE 10 2010 046 530 A1 discloses an accumulator model comprising a housing that is open at the top, at least during charging with at least one rechargeable secondary cell, and which has a housing opening, a housing bottom and a closed housing wall.

[0006] DE 10 2015 118 605 A1 discloses an energy storage device for a vehicle, wherein the energy storage device has several energy storage cells, wherein the energy storage device comprises an electrically insulating and thermally conductive cooling component for cooling the energy storage cells to form a base body, wherein at least one of the several energy storage cells is embedded in a recess defined by the base body, wherein a thermally conductive filling element is arranged at least partially between the energy storage cell and the cooling component.

[0007] US 2016 / 0301117A1 discloses a battery module with a housing having an opening and an electrochemical cell arranged in the housing.

[0008] DE 10 2012 224 330 A1 discloses an electric accumulator device comprising: a first accumulator cell having a first elastic element on a first side, a cooling element for cooling the first accumulator cell and a first sealing layer that at least partially surrounds the first accumulator cell with the first elastic element in order to seal it against an environment, wherein an expansion of the first accumulator cell leads to a compression of the first elastic element.

[0009] Current systems for removing battery pack waste heat are limited by technical problems and often suffer from brittle materials, cracking, and ineffective contacts that impede heat transfer. Additionally, there are limitations in that currently used materials do not adapt well to variations.

[0010] There is a long-standing desire in engineering for new systems and methods for heat transfer where constant contact between components can be maintained using materials that meet different design requirements and have effective thermal properties for safely transferring the waste heat from the cells of the battery packs. SUMMARY

[0011] The present invention is based on the objective of providing an improved system for providing an even distribution of waste heat in a battery pack and a method for providing an even distribution of waste heat from a vehicle battery pack via a deformable thermal paste.

[0012] This problem is solved by the subject matter of the independent claims. Advantageous embodiments of the present invention are described in the dependent claims.

[0013] The embodiments described here illustrate a system for providing an even distribution of waste heat within the vehicle battery pack. The system can include the battery pack, at least one cooling plate extending between two cells of the battery pack, and a coolant reservoir coupled to the cooling plate via the deformable thermal paste between them, allowing heat transfer. A cooling plate can be made of aluminum. In certain embodiments, a support structure exists between the battery pack and the coolant reservoir, and the deformable thermal paste, in the form of a liquid or gel (or a paste, or one containing a paste), can be placed within the support structure. The deformable thermal paste can be a liquid polymer and / or a liquid gel.The deformable thermal paste can be configured to be flowable, thus filling the space between the storage compartment and each cell of the battery pack, ensuring constant thermal contact between the entire lower surface of each cell and the upper surface of the coolant reservoir. When flowing into the space, the deformable thermal paste can be, for example, approximately two to five millimeters thick or approximately six to twenty-five millimeters thick. In certain embodiments, the deformable thermal paste maintains constant thermal contact through cross-linking, which reduces the flowability of the paste and ensures the even distribution of heat via thermal conduction from each cell to the coolant reservoir. Cross-linking can be achieved thermally and / or photochemically.Crosslinking methods can also include chemical crosslinking such as peroxide hardening and the addition of a catalyst; other crosslinking methods include ultraviolet and laser crosslinking.

[0014] Additional embodiments of a method described here provide for the uniform distribution of waste heat from the battery pack in the vehicle via the deformable thermal paste. Specific embodiments include providing the coolant reservoir and the support structure connected to the reservoir, and placing the deformable thermal paste in the form of a liquid or gel within the support structure. Specific embodiments include positioning the bottom surface of the battery pack in the liquid and / or gel such that the liquid and / or gel flows around each cell of the battery pack, ensuring constant thermal contact between the entire lower surface of each cell of the battery pack and a surface of the coolant reservoir.

[0015] The process can also include crosslinking the deformable thermal paste, thereby reducing its flowability and providing the necessary thermal conductivity for the even distribution of waste heat from each cell to the coolant reservoir. The liquid or gel can be used independently or together and can contain a polymer. Crosslinking can be partial (approximately 1 to 50 percent) or complete (approximately 100 percent). In certain embodiments, the cold plates can be coupled to the battery pack before the deformable thermal paste is introduced into the support body. BRIEF DESCRIPTION OF THE FIGURES

[0016] The following detailed description of the specific embodiments of the present invention can best be understood when read in conjunction with the following drawings, in which identical constructions are designated by the same reference numerals. Fig. Figure 1 shows a schematic representation of an embodiment of a system for providing the uniform distribution of waste heat in the vehicle battery pack and illustrates the deformable thermal paste; Fig. Figure 2 illustrates a cross-section of the system. Fig. 1 along line 2-2 from Fig. 1; Fig. Figure 3 illustrates exemplary embodiments of cooling plate shapes; Fig. Figure 4 illustrates that the vehicle can contain one or more cells from one or more battery sets inside; and Fig.Figure 5 illustrates the use of embodiments in an application where heat distribution from a small heat sink to an external heat sink is required.

[0017] The embodiments shown in the drawings are for illustrative purposes only and are not intended to limit the embodiments defined by the claims. Furthermore, certain aspects of the drawings and the embodiments become more apparent and are understood in light of the detailed description that follows. DETAILED DESCRIPTION

[0018] Specific embodiments of the present disclosure are now described. However, the invention can be implemented in various forms and should not be interpreted as being limited to the embodiments presented here. Exemplary embodiments are provided to ensure that this disclosure is thorough and fully conveys its scope to those skilled in the art.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as they would normally be understood by a person skilled in the art in the field to which the embodiments of this invention belong. The terminology used here serves solely to describe certain exemplary embodiments and is not intended to be restrictive in any way. As used in the description and the appended claims, the singular forms "a" and "the" may also include the plural forms, unless the context clearly excludes this.

[0020] Unless otherwise specified, all numbers expressing quantities of components, properties such as molecular weight, reaction conditions, and so forth, as used in the description and claims, shall in all cases be understood to be modified by the term "approximately," which is intended to mean up to ±10% of a given value. Furthermore, the disclosure of ranges in the description and claims shall be understood to mean the range itself and also everything subsumed therein, including endpoints. Unless otherwise specified, the numerical properties set forth in the description and claims are approximate values ​​that may vary depending on the desired properties sought in embodiments of the present invention.Notwithstanding the fact that the numerical ranges and parameters illustrating the broad scope of embodiments of the invention are approximations, the numerical values ​​presented in the specific examples are illustrated as accurately as possible. However, each numerical value inherently contains certain errors that necessarily result from errors found in its respective measurements.

[0021] Parts of the procedure described herein, such as mathematical determinations, calculations, input of data for calculations or determinations of equations or parts thereof, may be performed on parts thereof or on one or more computers or computer systems, which may include one or more processors and software to run or execute programs and to perform calculations or computations.

[0022] The methods and systems described herein, and parts thereof, can be combined to implement embodiments of the invention. Word forms used herein may have variations: for example, when a word such as "couple" is used, this means that variations such as "coupled with" and "coupling" are understood and have been taken into account. When terms such as "formula," "design," and "formulation" are used, all forms of such words have been considered for the methods and systems contained herein.

[0023] In the present context, as used here, "vehicle" can include a car, truck, van, sport utility vehicle (SUV) or the like, and can all be electric or include other forms of power such as one or more conventional engines or one or more internal combustion engines.

[0024] Fig.Figure 1 shows a circuit diagram of an embodiment of the system 1 for a uniform distribution of waste heat in the vehicle battery pack and demonstrates the deformable thermal paste 4. The cell 2 of the battery pack is also illustrated; seven cells 2 are shown forming a battery pack, although other numbers of cells 2 are possible, such as one to about ten, or from about one to about thirty, or multiple battery packs of varying numbers of cells 2. Also shown are a foam 3, such as a strip or strips, extending between the cells 2, the upper section 5 of the cooling plate (here also referred to as the solid fin), the coolant reservoir 6, the support structure 7, and the cooling plate bottom section 8. The coolant inlet 9 and the coolant outlet 10 are also shown. In certain embodiments, the coolant reservoir 6 has a convective coolant flow in the direction of arrow 11.In certain embodiments, the flow direction can be in the opposite direction. A cross-section of the system of... Fig. 1 along line 2-2 is shown in Fig. 2. Also shown are the cell 2, the coolant reservoir 6, the cooling plate base section 8, and the deformable thermal paste 4, which in certain embodiments flows above and below the cooling plate base section 8. In certain embodiments, the coolant reservoir contains ethylene glycol mixtures and / or other cooling fluids such as organic refrigerants, phase-change materials (such as ammonia), or short-chain alcohols (for example, ethanol and / or methanol). In the case of gas cooling, air or nitrogen can be used. The flow rates vary depending on the cooling medium. Typical flow rates for liquids are 10 liters per minute, while air cooling rates are typically 200–300 m³ / h. 3 / h. Steady-state temperatures can be around 25 degrees Celsius or less. One or more of the cooling plates can be in an approximate "L-shape" ( Fig.1) wherein the bottom section 8 of the cooling plate has a length at the bottom of the “L-shape” (and in a longitudinal axis of the coolant reservoir 6) and the upper section 5 of the cooling plate has a length at the top of the “L-shape” (and extends between and / or along the outer edge of one or more of the cells 2 along a plane in the direction of the cell height). There may be more than one cold plate, such as four or more as shown. A technical difficulty in the technology involves aligning the cold plates, and embodiments provided here establish nearly 100% contact between the individual cells 2 and the coolant reservoir 6 when the cold plates are perfectly aligned (so that the bottom sections 8 of the cold plates form a single plane) as well as when they are not.As for the deformable thermal paste 4, it can flow in such a way that it surrounds everything around the bottom section 8 of one or more cold plates as well as part of the upper section 5 of the cooling plate. Fig. Figure 3 illustrates exemplary embodiments of cooling plate shapes such as a slit shape 12, spring fin 13, conventional 14 and corrugated plate 15; embodiments may include one, more than one or all shapes in a system 1.

[0025] Fig.Figure 4 illustrates the vehicle 16, which contains one or more of the cells 2 of one or more battery sets. The battery set or sets can be arranged in the front, middle, or rear of the vehicle. The battery set or sets can be coupled to the vehicle floor. Additionally, the systems 1 sketched here can include cooling in computer applications inside and / or outside the vehicle 16 where heat conduction between interfaces is required. In certain embodiments, the vehicle includes the use of the deformable thermal paste 4 within a system 1 that supplies power to the vehicle 16 and also includes the deformable thermal paste 4 within a computer system with a power source and control of an aspect of the vehicle other than propulsion. Fig.Figure 5 illustrates the use of embodiments in an application where heat distribution from a small heat sink to an external heat sink is required. Shown are a heat source 17, such as a motor, a heat sink 18, a fixed structural interface 19, and a support structure 7. The fixed structural interface 19 can include the deformable thermal paste 4, which acts as a heat conductor to move heat from the source 17 to the fixed structural interface 19.

[0026] In certain embodiments of the systems and methods described herein, the deformable thermal paste is part of a formulation comprising the deformable thermal paste (here, thermal conductivity and thermal spreading are used synonymously). The formulation may include a combination of one or more of the following: a condensation polymer (poly(dimethylsiloxane)), a processing aid (fluorosurfactant, perfluorononanoic acid), and a thermal dissipation agent (such as boron nitride, although this may be used in combination with one or more ceramics) for spreading the heat from exposed surfaces in a coating.

[0027] The formulations may include one or more (or all) of the following: a thermally conductive silicone compound, a thermally conductive epoxy compound, a thermally conductive alkyd resin with a styrene solvent mixture, a thermally conductive Kynar® resin, a thermally conductive adhesive, and / or a thermally conductive polyoctenamer as outlined below. Some of the described resins may be loaded with graphite and / or aluminum powders and may give high thermal conductivity, but may also be electrically conductive, necessitating the use of electrically conductive powder such as graphite, carbon black, aluminum, copper, zinc, silver, or mixtures thereof. The formulations may include one or more of the components or all of the examples provided in the text below. Thermally conductive silicone compound (which may contain Quick-Sil®)

[0028] This mixture is a two-component, room-temperature curing (RTV) silicone rubber with a working time of 1 to 2 minutes and a curing time of approximately 15 minutes. Component A (or Component B) is kneaded with aluminum oxide, synthetic diamond, or boron nitride powder (based on total resin solids) as a thermally conductive additive at a concentration of 5 to 50 wt.% (and preferably 33 wt.%) in specific embodiments. Component B (or Component A) is then rapidly kneaded with the second component, and the resulting putty is quickly used as a potting compound to protect automotive battery cells. The conductive silicone produces 100% solid, tough, strong, flexible, and durable molds with 0% shrinkage. Thermally conductive epoxy mixture

[0029] This mixture is a two-component epoxy resin system (such as one or more from MasterBond®, Loctite®, Gorilla®, or 3M®, etc.), consisting of an epoxy resin and hardener. These components can be kneaded as individual parts or as a mixture of components with between 5 and 50 wt.% (and preferably 33 wt.%) in specific embodiments, with aluminum oxide, synthetic diamond, or boron nitride powder (based on total resin solids) as a thermally conductive additive. The putty material can be rapidly used as a potting compound for protecting automotive battery cells. The thermally conductive epoxy resin produces 100% solid, tough, strong, flexible, and durable forms with low shrinkage. Thermally conductive alkyd resin with styrene solvent mixture

[0030] This mixture is an unsaturated polyester (such as a fumaric acid-ethylene glycol-based polyester or an oxypropylated bisphenol-A fumarate resin) or other styrene-soluble alkyd polyester resins (3M®, Kao®, Oxychem®, etc.) that can be mixed with styrene monomer to form a paste and then has methyl ethyl ketone peroxide added. The putty can be kneaded with 5 to 50 wt.% (and preferably 33 wt.%) of aluminum oxide, synthetic diamond, or boron nitride powder (based on total resin solids) as a thermally conductive additive. The putty material can be rapidly used as a potting compound for protecting automotive battery cells. The thermally conductive mixture produces 100% solid, tough, strong, flexible, and durable shapes with low shrinkage. Thermally conductive Kynar® resin

[0031] This resin is a polyvinylidene fluoride copolymer (Arkema®, Kynar® 2751) that is formed into a paste with acetone (50 wt.% solids) and then kneaded with 5 to 50 wt.% (and preferably 33 wt.%) aluminum oxide, synthetic diamond, or boron nitride powder (based on total resin solids) as a thermally conductive additive. The resulting putty can then be used as a potting compound to protect automotive battery cells. The thermally conductive mixture produces tough, strong, flexible, and durable forms with low shrinkage. Thermally conductive Booger-Glue® adhesive

[0032] A block of Booger-Glue® adhesive or credit card adhesive (polyisobutene) can be kneaded with 5 to 50 wt.% (and preferably 33 wt.%) of aluminum oxide, synthetic diamond, or boron nitride powder (based on total resin solids) as a thermally conductive additive. The mixture can then be used as a potting compound to protect automotive battery cells. The thermally conductive mixture produces 100% solid, tough, strong, flexible, and durable shapes with low shrinkage. Thermally conductive polyoctenamer

[0033] Cyclooctene (Aldrich) and a catalyst are combined in certain embodiments at between 5 and 50 wt.% (and preferably 33 wt.%) with aluminum oxide, synthetic diamond, or boron nitride powder (based on total resin solids) as a thermally conductive additive. In certain embodiments, the catalyst is a ring-opening metathesis polymerization catalyst (such as Grubb's® catalyst). The mixture can then be used as a potting compound to protect automotive battery cells. The thermally conductive mixture produces 100% solid, tough, strong, flexible, durable, and rubber-like forms with zero shrinkage.

[0034] Thermal pastes can be used, and exemplary thermal conductivities of exemplary thermal conductivity pastes are provided in Table 1 below. In certain embodiments, the thermal conductivity of the paste is approximately 2.5 W / mK. In certain embodiments, the conductivity can range between approximately 2.5 and approximately 11.3 W / mK. Table 1 material Thermal conductivity, Watt / mK Silicone with 10% boron nitride 4,28 Silicone with 33% boron nitride 5,54 Silicone with 50% boron nitride 8,58 Kynar® with 50% boron nitride 7,92 Alkyd resin with styrene solvent mixture containing 33% boron nitride 7,18 Alkyd resin with styrene solvent mixture containing 33% synthetic diamond (3.5 micrometers) 10,03 Alkyd resin with styrene solvent mixture containing 33% (equal weights of synthetic diamond and boron nitride) 11,3

[0035] Not according to the invention, the deformable thermal paste can be part of a formulation with one or more of polyvinylidene fluoride, boron nitride, melamine, a processing aid, and a ceramic material. Not according to the invention, the formulation comprises the following fractions by weight: approximately 0.65 to approximately 0.75 wt.% polyvinylidene fluoride; approximately 0.10 to 0.15 wt.% boron nitride; approximately 0.05 to approximately 0.10 wt.% melamine; and approximately 0.05 to 0.1 wt.% the

[0036] Processing aid and the ceramic composite materials. In certain embodiments, boron nitride with a heat transfer coefficient of approximately 1700 watts per square meter per Kelvin is used. Other materials such as synthetic diamond and aluminum oxide can be employed.

[0037] According to the invention, the deformable thermal paste is a component of a formulation comprising one or more of polydimethylsiloxane, boron nitride, melamine, a processing aid, and a ceramic material. According to the invention, the formulation comprises 0.1 to 50 wt.% boron nitride; 0.05 to 0.10 wt.% melamine; 0.05 to 0.1 wt.% processing aid and the combined ceramic materials; and the remaining amount is polydimethylsiloxane.

[0038] In certain embodiments, one or more of the formulations described herein may comprise one or more of the following: alkyds, polyisobutylene, epoxy resin or resins, polyurethanes (foams) and polycycloolefins.

[0039] In other specific embodiments of the systems and methods described herein, the battery pack comprises lithium-ion cells. Embodiments may also include prismatic pocket-type and / or cup-type cells.

[0040] Certain systems and methods described herein may involve shaking and / or vibrating the system to distribute the deformable thermal paste. In certain embodiments, for example, the shaking and / or vibration may be performed after the deformable thermal paste has been placed in the support body and prior to crosslinking. In certain embodiments, crosslinking is performed, which reduces the flowability of the deformable thermal paste. In certain embodiments, the flowability decreases to such an extent that the crosslinked thermal paste forms a solid and, in certain embodiments, provides a support structure for the battery pack. As used here, a solid would refer to complete crosslinking of the liquid or gel, such that a solid forms and would indicate a fully cured liquid or gel.In certain embodiments, the degree of hardening is measured by testing a material sample and examining it on an NMR machine to determine the degree of crosslinking. Flowability testing can be performed before the material is crosslinked using a dynamic mechanical analyzer.

[0041] Certain embodiments provided herein incorporate a polymer matrix. As used herein, the polymer matrix refers to a mixture of polymers.

[0042] Specific embodiments use one or more methods or parts of the systems described herein in combination with one or more acrylic ceramic materials or a silicone base.

Claims

[1] System (1) for providing an even distribution of waste heat in a battery set comprising: the battery pack; at least one cooling plate located between two cells (2) of the battery pack extends, wherein the cooling plate has an “L” shape, comprising a lower, longitudinally arranged coolant reservoir (6) section (8) and an upper section (5) arranged along the cell height; a coolant reservoir (6) coupled to the cooling plate via a deformable thermal paste (4) so ​​that heat can be conducted between them, wherein the coolant reservoir (6) contains a coolant flow in the form of a liquid or a gas; a support structure (7) between the battery pack and the coolant reservoir (6); and wherein the deformable thermal paste (4) in the form of a liquid and / or a gel can be placed within the support structure and is configured to fill the space between the coolant reservoir (6) and each cell (2) of the to be fluid in the battery pack, so that there is constant thermal contact between an entire lower surface of each cell (2) of the battery pack and an upper side of the coolant reservoir (6), and wherein the deformable thermal paste (4) maintains constant thermal contact by cross-linking, which reduces the fluidity of the deformable thermal paste (4) and provides an even distribution of waste heat by dissipating the waste heat from each of the cells (2) to the coolant reservoir (6), wherein the deformable thermal paste (4) comprises a cross-linked condensation polymer, wherein the deformable thermal paste (4) is part of a formulation, wherein the formulation comprises polydimethylsiloxane, boron nitride, melamine, a processing aid and a ceramic, and the formulation includes: from 0.1 to 50 wt% boron nitride; from 0.05 to 0.10 wt% melamine; from 0.05 to 0.1 wt.% processing aid and the combined ceramic materials; and the remaining residue is polydimethylsiloxane. [2] Method for providing a uniform distribution of waste heat in a battery pack of a vehicle (16) via a deformable thermal paste (4), comprising: a provision of at least one cooling plate extending between two cells (2) of the battery pack, wherein the cooling plate has an ‘L’ shape, comprising a lower section (8) arranged along a coolant reservoir (6) and an upper section (5) arranged along the cell height; a provision of the coolant reservoir (6), wherein the coolant reservoir (6) contains a coolant stream in the form of a liquid or a gas; and a support structure (7) coupled to the coolant reservoir (6); a placement of the deformable thermal paste (4) in the form of a liquid and / or a gel within the support structure (7), wherein the deformable thermal paste (4) flows below and above the lower section of the cooling plate; placing a base surface of the battery pack into the liquid and / or gel, so that the liquid and / or gel covers each of the cells (2) of the battery pack a flow of coolant ensures constant thermal contact between the entire lower surface of each of the cells (2) of the battery pack and a surface of the coolant reservoir (6); and the crosslinking of the deformable thermal paste (4) and thereby the reduction of the flowability of the deformable thermal paste (4) and the provision of the uniform distribution of waste heat by dissipating the waste heat from each of the cells (2) to the coolant reservoir (6), wherein the deformable thermal paste (4) comprises a cross-linked condensation polymer, wherein the deformable thermal paste (4) is part of a formulation comprising polydimethylsiloxane, boron nitride, melamine, a processing aid and a ceramic, and the wording includes: from 0.1 to 50 wt% boron nitride; from 0.05 to 0.10 wt% melamine; from 0.05 to 0.1 wt.% processing aid and the combined ceramic materials; and the remaining residue is polydimethylsiloxane. [3] Method according to claim 2, further comprising shaking the system (1) according to claim 1 to distribute the deformable thermal paste (4) after placing the deformable thermal paste (4) and before crosslinking the deformable thermal paste (4). [4] Method according to claim 2, further comprising vibrating the system (1) according to claim 1 to distribute the deformable thermal paste (4) after placing the deformable thermal paste (4) and before crosslinking the deformable thermal paste (4). [5] Method according to claim 2, wherein the reduction of the flowability of the deformable thermal paste (4) is such that the cross-linked thermal paste (4) forms a solid and serves as a structural support for the battery pack.

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