Battery cell with laterally arranged structural adhesives used for heat dissipation

Abstract

Battery cell with laterally arranged structural adhesives for heat dissipation. The invention relates to a battery cell (10) with laterally arranged structural adhesives (26) for heat dissipation, consisting of several stacked battery units (20), each consisting of an electrochemical system (201) formed by the clamping of two electrode current-collecting layers (24, 25) and encapsulated by the electrode current-collecting layers (24, 25) and a structural adhesive (26) surrounding the electrochemical system (201), the sides of the electrode current-collecting layers (24, 25) in contact with the insulating coatings (30) being insulated and a thermally conductive adhesive (40) in contact with the insulating coatings (30) and the structural adhesives (26) being further added.This is why the battery units (20) provide a better insulation and heat dissipation effect. Figure to be published with the abbreviation: Figure 6C,

Description

Title of the invention: Battery cell with laterally arranged structural adhesives for heat dissipation Field of the invention

[0001] The present invention relates to a battery cell and, in particular, to a battery cell which is made up of fully and individually encapsulated battery units and the sides of which are provided with insulating coatings and a thermally conductive adhesive. Prior art

[0002] In recent years, with the rapid development of various fields such as portable electronic products / electric vehicles / energy storage power stations, the high requirements for energy storage devices with high energy storage density and high environmental protection have been constantly increased. Ion secondary batteries have become the first choice. Various secondary batteries have also been developed, such as lithium-ion secondary batteries, magnesium-ion secondary batteries, and sodium-ion secondary batteries. In practice, a battery cell is generally formed by uniaxial stacking of planar battery units and appropriate electrical connections, so as to obtain sufficient capacity that can be used for various devices.

[0003] The traditional series connection method provides, among other things, that the connection is made through the electrically conductive contact terminals located on the outer side of the battery cell, using a shrink film for encapsulation and insulation. However, since the shrink film only has an insulating effect and has no heat dissipation capability, the heat dissipation effect of the entire battery cell is greatly reduced. At the same time, this structure also reduces the energy density of the battery cell, since external mechanisms such as electrically conductive contact terminals occupy a certain amount of space. At the same time, the internal resistance of the battery cell is increased by the presence of electrically conductive contact terminals and other mechanisms.While it is possible to use thermally conductive adhesive to dissipate heat from the battery cell, it cannot directly dissipate heat from the internal units of the battery, where the actual heat is generated, because the thermally conductive adhesive is only in contact with the outer surface of the battery cell. Therefore, the heat dissipation effect is quite limited.

[0004] The invention aims to solve the above-mentioned problems and to propose a new battery cell with laterally arranged structural adhesives serving for heat dissipation. Objective of the invention

[0005] The main objective of the present invention is to provide a battery cell with laterally arranged structural adhesives for heat dissipation, in which a heat-conducting adhesive and insulating coatings are arranged on the sides of the electrode current-collecting layers of the stacked battery units, in order to significantly reduce the thermal resistance between the battery cell and the external contacts and thereby improve the heat dissipation efficiency of the battery units.

[0006] The present invention relates to a battery cell with laterally arranged structural adhesives for heat dissipation, which comprises several stacked battery units, in which electrode current collector layers of different polarity are in contact and are stacked, insulating coatings applied to the sides of the electrode current collector layers and a thermally conductive adhesive surrounding the sides of the battery cell, each battery unit being a complete and independent module and comprising two electrode current collector layers and an electrochemical system arranged between the two electrode current collector layers and having an electrolytic system, a structural adhesive being arranged in each case between two electrode current collector layers and surrounding the corresponding electrochemical system,the insulating coatings being disposed between adjacent structural adhesives and each covering the sides of the two corresponding electrode current collecting layers to insulate the sides of the electrode current collecting layers, and then a thermally conductive adhesive being added to surround the sides of the battery cell and cover the structural adhesives and the insulating coatings. At the same time, the thermally conductive adhesive contains thermally conductive particles capable of dissipating heat directly from the battery units to greatly reduce the thermal contact resistance between the battery units and the case, thereby improving the heat dissipation efficiency of the battery units. In addition, the particles of the thermally conductive adhesive have at least two different particle sizes to achieve a dense stacking effect and thus further improve resistance to external forces.

[0007] Thus, the present invention firstly relates to a battery cell with structural adhesives arranged laterally and serving for heat dissipation, said cell comprising: • multiple battery units that are stacked on a single axis and each comprise the following: • two electrode current collecting layers which are arranged parallel to each other; • an electrochemical system, which is arranged between the two electrode current collecting layers; • a structural adhesive, which is disposed between the two electrode current collecting layers and which surrounds the electrochemical system; and • two insulating coatings, each of which covers the sides of the two electrode current collecting layers; and • a thermally conductive adhesive, which surrounds the sides of the battery units and covers the structural adhesives and insulating coatings and comprises thermally conductive particles, the particles having at least two different particle sizes. In accordance with other special optional features:

[0008] - the structural adhesive and the two electrode current collecting layers serve of an encapsulation structure of a battery unit, such that, in a battery unit, only a charge transfer takes place, but there is no electrochemical reaction, and therefore the electrolytic systems of the electrochemical system are not continuously connected to each other; and / or

[0009] - the structural adhesive protrudes from the two electrode current collecting layers; and / or

[0010] - the insulating coatings further extend to the sides of the adhesives structural; and / or

[0011] - the structural adhesives further protrude from the insulating coatings; and / or

[0012] - the thermally conductive adhesive further fills the recesses which are formed by the structural adhesives of the battery units, which protrude from the electrode current collecting layers; and / or

[0013] - the battery units are arranged offset from each other, the insulating coatings penetrating into the space between each two adjacent stacked electrode current collecting layers to close the exposed spaces, located between each two adjacent electrode current collecting layers, and the side edges; and / or

[0014] - the insulating coatings further extend to the sides of the adhesives structural; and / or

[0015] - a respective insulating coating contains inorganic insulating particles, the particle size of inorganic insulating particles being less than the size of particle of the particles present in the thermally conductive adhesive and exhibiting thermal conductivity; and / or

[0016] - the thermally conductive adhesive contains metal or metal oxide powder.

[0017] In order to better understand the problems, technical contents, characteristics and advantageous effects of the present invention, concrete embodiment examples are described in detail below. Brief description of the drawings

[0018] [Fig.lA] shows a schematic view of the battery cell according to the invention with structural adhesives arranged laterally and serving for heat dissipation;

[0019] [Fig.lB] shows a schematic view of another embodiment of the battery cell according to the invention with structural adhesives arranged laterally and serving for heat dissipation;

[0020] [Fig.2A] shows a schematic view of a battery unit of the battery cell according to the invention with laterally arranged structural adhesives serving for heat dissipation;

[0021] [Fig.2B] shows a schematic exploded view of a battery unit of the battery cell according to the invention with laterally arranged structural adhesives serving for heat dissipation;

[0022] [Fig.3A] shows a schematic view of the stacked battery units of the battery cell according to the invention with laterally arranged structural adhesives serving for heat dissipation;

[0023] [Fig.3B] shows a schematic view of the battery cell according to the invention with laterally arranged structural adhesives serving for heat dissipation, in which the stacked battery units are provided with additional insulating coatings;

[0024] [Fig.4A] shows a schematic view of another embodiment of the insulating coatings of the battery cell according to the invention with structural adhesives arranged laterally and serving for heat dissipation;

[0025] [Fig.4B] shows a schematic view of another embodiment of the insulating coatings of the battery cell according to the invention with structural adhesives arranged laterally and serving for heat dissipation;

[0026] [Fig.5] shows a schematic view of another exemplary embodiment of a unit of battery of the battery cell according to the invention with laterally arranged structural adhesives serving for heat dissipation;

[0027] [Fig.6A] shows a schematic view in which the battery cell according to the invention, with laterally arranged structural adhesives serving for heat dissipation, is made up of the battery units shown in [Fig.5];

[0028] [Fig.6B] shows a schematic view in which the battery cell according to the invention, with laterally arranged structural adhesives serving for heat dissipation, is made up of the battery units shown in [Fig.5];

[0029] [Fig.6C] shows a schematic view in which the battery cell according to the invention, with laterally arranged structural adhesives serving for heat dissipation, is made up of the battery units shown in [Fig.5];

[0030] [Fig.6D] shows a schematic view in which the battery cell according to the invention, with laterally arranged structural adhesives serving for heat dissipation, is made up of the battery units shown in [Fig.5];

[0031] [Fig.7A] shows a schematic view of another embodiment of the insulating coatings of the battery cell according to the invention with structural adhesives arranged laterally and serving for heat dissipation;

[0032] [Fig.7B] shows a schematic view of another embodiment of the insulating coatings of the battery cell according to the invention with structural adhesives arranged laterally and serving for heat dissipation;

[0033] [Fig.8] shows a schematic view of an exemplary embodiment in which the battery cell according to the invention, with laterally arranged structural adhesives serving for heat dissipation, is applied to a prismatic battery;

[0034] [Fig.9] shows a schematic diagram of comparison of the temperatures of a experiment in which the battery cell according to the invention, with laterally arranged structural adhesives serving for heat dissipation, is applied to a prismatic battery. Detailed description of the examples of realization

[0035] In order to better understand the advantages, nature and characteristics of the present invention, exemplary embodiments are described in detail below with reference to the accompanying drawings. The present invention is described with reference to given exemplary embodiments and with reference to given drawings, but the invention is not limited thereto. These exemplary embodiments are provided only for the purpose of making the present disclosure more thorough and easier to understand.

[0036] The terminology used herein is for the sole purpose of describing given exemplary embodiments and is not intended to limit the general idea of the invention. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as that which a person of average skill in the art, specialized in the field to which the exemplary embodiments pertain, attributes to them. It should also be noted that expressions, for example those defined in commonly used dictionaries, should be interpreted as having the meaning consistent with their meaning in the context of the art. concerned, and not in an idealized or excessively formal sense, unless expressly defined in this description.

[0037] Throughout this specification, a reference to "a single embodiment" or "any embodiment" means that a function, structure, or property described in the context of the embodiment is included in at least one embodiment of the present invention. Thus, the expressions "in a single embodiment" or "in any embodiment" used in different places in this specification do not necessarily all refer to the same embodiment, but may refer to different embodiments. Furthermore, as a person of average technical skill can appreciate from the present invention, the different functions, structures, or features may be suitably combined in one or more embodiments.

[0038] Reference will be made to [Fig.lA]. The battery cell according to the invention, with laterally arranged structural adhesives 10 serving for heat dissipation, comprises several battery units 20 stacked along an axis, the sides of the battery units 20 being coated with insulating coatings 30 and a thermally conductive adhesive 40, and each battery unit 20 being a complete and self-contained module. The battery cell 10 can be placed in a housing to serve as a power supply unit, such as a prismatic battery. A battery unit 20 is described below.

[0039] Reference will be made to Figures 2A and 2B. The battery unit 20 comprises two electrode current collecting layers 24, 25, an electrochemical system 201 and a structural adhesive 26, the electrochemical system 201 comprising a separation layer 21, two active material layers 22, 23 arranged on two sides of the separation layer 21, and an electrolytic system transferring reactive ions from the active material layers 22, 23. The material selected for the separation layer 21 may be an insulating material without ionic conductivity or a material with ionic conductivity. If the material selected for the separation layer 21 is an insulating material without ionic conductivity, it has microholes to allow ions to pass through the separation layer by means of an electrolytic medium.If the material of the separation layer 21 itself does not have ionic conductivity, the separation layer 21 has microholes to allow ions to pass through the separation layer by means of an electrolytic medium. The separation layer 21 is a porous layer of polymeric materials or glass fibers, a microporous structure formed by stacking or sintering particulate ceramic materials, or a combination of these materials. If the material of the separation layer 21 is an ion-conducting material, such as for example . ceramic powder of an oxidized solid electrolyte, the separation layer 21 must not, in this case, have microholes for the transport of ions, but the transport takes place through the solid / solid interface of the oxide solid electrolyte. The microholes can be in the form of through holes or meandering holes (non-linear and continuous).

[0040] The ceramic powder forming the separation layer 21 may be, in the separation layer 21, an insulating material without ionic conductivity or an oxide solid electrolyte with ionic conductivity and its initial particle size range may be on the micrometer or nanometer scale or be a mixture of two very different scales, such as for example a mixture of micrometer scale and nanometer scale. If an insulating material without ionic conductivity is chosen for the ceramic material, it may be made of micrometer or nanometer scale materials such as titanium dioxide (TiO2), aluminum (I) oxide (Al2O3), silicon dioxide (SiO2), etc. or alkylated ceramic particles.If a solid oxide electrolyte having ionic conductivity is chosen for the ceramic powder, it may be, for example, lithium lanthanum zirconium oxide (lithium lanthanum zirconium oxide; Li7La3Zr20i2; LLZO), lithium aluminum titanium phosphate (LATP) and other similar materials. Furthermore, the ceramic material used in the separation layer 21 may be a mixture of insulating ceramic material and solid oxide electrolyte. When the separation layer is formed by stacking the ceramic powder, it may further comprise a polymer adhesive such as polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP), polytetrafluoroethylene (PTFE), acrylic adhesive (acrylic acid glue), epoxy resin, polyethylene oxide (PEO), polyacrylonitrile (PAN) and polyimide (PI).

[0041] The electrolyte system may be a liquid, colloidal, solid, or mixed electrolyte from any combination thereof. The active material layers 22, 23 are separated by the separating layer 21 therebetween, the active material layers 22, 23, the electrolyte system, and the separating layer 21 together forming an electrochemical system 201. Extracting or supplying / alloying the active materials from the active material layers 22, 23 allows chemical energy to be converted into electrical energy (power supply) or electrical energy to be converted into chemical energy and stored in the system (charge), whereby the generated electrons can be directly extracted from the electrode current-collecting layers 24, 25. The materials of the electrode current-collecting layers 24, 25 are electronically conductive materials—copper and aluminum are common.Of course, the materials of these can . also be other metals such as nickel, tin, silver and gold or metal alloys. The materials of the electrode current collecting layers 24, 25 may also be conductive polymer materials.

[0042] The electrode current collecting layers 24, 25 of the battery unit 20 are matched to the structural adhesive 26 located on the periphery and together serve as an encapsulation structure of the battery unit 20 to isolate the electrochemical system 201 from the external environment. The structural adhesive 26 is a polymer material, and apart from being able to adhere to the surfaces of the electrode current collecting layers 24, 25 and having to resist in the electrolytic system, it is not subject to particular constraints, a duroplastic resin being preferred. For example, the material of the structural adhesive 26 may be an epoxy resin, polyethylene, polypropylene, polyurethane, thermoplastic polyimide, silicone resin, acrylic resin, silica gel, or a UV-curing adhesive. The structural adhesive 26 is disposed at the periphery between the two electrode current-collecting layers 24, 25 and surrounds the electrochemical system 201 (the active material layers 22, 23 and the separation layer 21 located therebetween), with both end surfaces thereof being at least partially bonded to the two electrode current-collecting layers 24, 25 at the same time. The structural adhesive 26 and the two electrode current-collecting layers 24, 25 encapsulate the electrolytic system between the two electrode current-collecting layers 24, 25 without leakage and do not communicate with the electrolytic systems of the other battery units 20.Therefore, a battery unit 20 is a self-contained and complete power supply module, which is formed by directly using the two electrode current collecting layers 24, 25 and the structural adhesive 26 as an encapsulation structure.

[0043] Referring now to [Fig. 3A]. To form a series circuit, the battery units 20 are stacked in the same direction on a single axis. As shown in the figure, for stacking, all the electrode current collecting layers 24 of one polarity are oriented upwards and all the electrode current collecting layers 25 of the other polarity are oriented downwards. Reference will then be made to Figures 1A, 3A and 3B. The sides of the electrode current collecting layers 24, 25 are coated with insulating coatings 30 to insulate the sides of the electrode current collecting layers 24, 25 from the external environment. The thermally conductive adhesive 40 is then applied. As shown in [Fig.3B], open recesses 301 are formed between the electrode current collecting layers 24, 25 coated with the insulating coatings 30 and the structural adhesives 26.As the thermally conductive adhesive 40 is applied to the outer side of the insulating coatings 30 and the structural adhesives 26, it also fills the . recesses 301 and at the same time covers the insulating coatings 30 and the structural adhesives 26, which further improves the heat dissipation effect. With respect to the battery cell 10, in the internal battery units 20, the electrode current collecting layers 24, 25 form an internal series connection by direct surface contact. The use of this large-area connection can reduce the internal resistance and the thermal energy generated during operation.Externally, the electrode current collecting layer 24 of the uppermost battery unit 20 and the electrode current collecting layer 25 of the lowermost battery unit 20 serve as output terminals, the edges being covered by the thermally conductive adhesive 40, thereby greatly reducing the thermal resistance between the battery cell 10 and the external contacts, and thus improving the heat dissipation efficiency of the battery cell 10.

[0044] Referring to [Fig.lB]. Furthermore, the insulating coatings 30 may also extend to the sides of all the battery units 20, i.e., in addition to covering the sides of the electrode current collecting layers 24, 25, the insulating coatings 30 also cover the sides of the structural adhesives 26. Next, the thermally conductive adhesive 40 is applied to the insulating coatings 30.

[0045] Referring now to [Fig. 4A], when the battery units 20 are slightly offset from each other during the coating process of the insulating coatings 30 described above, the insulating coatings 30 penetrate into the gap between each two adjacent stacked electrode current collecting layers 24, 25 in order to close the exposed gaps and the side edges between each two stacked electrode current collecting layers 24, 25 and to prevent the subsequently applied thermally conductive adhesive 40 from contacting the electrode current collecting layers 24, 25 through the gaps. As shown in [Fig.4B], the insulating coatings 30 may also extend to the sides of all the battery units 20, i.e., in addition to covering the sides of the electrode current collecting layers 24, 25, the insulating coatings 30 also cover the sides of the structural adhesives 26. The thermally conductive adhesive 40 is then applied to the insulating coatings 30.

[0046] In addition to filling the recesses 301 and coating the insulating coatings 30 and the structural adhesives 26 by the aforementioned coating method, the thermally conductive adhesive 40 may be further formed by dipping onto the outer side of the insulating coatings 30 and the structural adhesives 26 after the insulating coatings 30 are applied.

[0047] In this case, the insulating coatings 30 may be made of inorganic insulating particles and their material may be silicon carbide (SiC), aluminum oxide (A12O3), boron carbide (B4C), silicon nitride (Si3N4) or titanium nitride (TiN), etc. The thermally conductive adhesive 40 is made of an amorphous material filling the spaces and having a certain capacity to deform under the effect of a load, such as for example a thermally conductive silicone, a thermally conductive gel or a thermally conductive insulating paste. Compared to the insulating coatings 30, the thermally conductive adhesive has better thermal conductivity, while allowing the addition of powders with high thermal transfer capacity, such as for example zinc, aluminum and other metal or metal oxide powders.

[0048] With respect to the size of the material particles, a respective insulating coating 30 may be a coating composed of inorganic insulating particles in the nanometer range, while the thermally conductive adhesive 40 is composed of particles having high thermal conductivity, the particle size of the thermally conductive adhesive 40 having the thermal conductivity being larger than the particle size of the inorganic insulating particles of the insulating coatings 30. For example, the particle size of the particles having the thermal conductivity of the thermally conductive adhesive 40 is in the micrometer range, the thermally conductive adhesive containing at least two powders of different sizes to achieve a dense stacking effect. The micrometer-sized and densely stacked thermally conductive adhesive 40 can achieve adequate rigidity to improve the resistance of the battery cell 10 to external forces.The inorganic insulating particles of the insulating coatings 30 have a smaller particle size, which makes it possible to form a denser and more insulating surface on the sides of the electrode current collecting layers 24, 25, and thus to reduce the required thickness of a respective insulating coating 30 in order to increase the proportion of the thermally conductive adhesive 40 and thus improve the heat dissipation efficiency of the battery cell 10.

[0049] Reference will now be made to [Fig. 5]. Furthermore, a respective structural adhesive 26 may be designed to protrude from the sides of the electrode current collecting layers 24, 25 to prevent improper contact of the rough edges of the electrode current collecting layers 24, 25 or improper contact of the electrode current collecting layers due to bending or misalignment between the battery units 20, which would otherwise result in a short circuit. Reference will be made to Figures 6A and 6B. Once the battery units 20 are stacked, they are insulated by covering the sides of the electrode current collecting layers 24, 25 with the insulating coverings 30. In this case, the structural adhesives 26 protrude from the insulating coverings 30, as shown in [Fig. 6C]. As the structural adhesives 26 protrude from the sides of the electrode current collecting layers 24, 25 and insulating coatings 30, recesses 301 are formed between the structural adhesives 26. The thermally conductive adhesive 40 is then applied and fills the recesses 301, the thermally conductive adhesive 40 at the same time covering the insulating coatings 30 and the structural adhesives 26 to further improve the heat dissipation effect. In addition to filling the recesses 301 and covering the insulating coatings 30 and the structural adhesives 26 by the aforementioned coating method, the thermally conductive adhesive 40 may also be formed by dipping after the application of the insulating coatings 30. As illustrated in [Fig.6D], the insulating coatings 30 may also extend to the sides of all the battery units 20, i.e., in addition to covering the sides of the electrode current collecting layers 24, 25, the insulating coatings 30 also cover the sides of the structural adhesives 26.The thermally conductive adhesive 40 is then applied to the insulating coatings 30.

[0050] Reference will now be made to [Fig. 7A]. If, during the process of applying the insulating coatings 30 described above, the battery units 20 are slightly offset from each other, the insulating coatings 30 penetrate into the gap between each two adjacent stacked electrode current collecting layers 24, 25 in order to close the exposed gaps and the side edges between each two stacked electrode current collecting layers 24, 25 and to prevent the subsequently applied thermally conductive adhesive 40 from contacting the electrode current collecting layers 24, 25 through the gaps. As shown in [Fig.7B], the insulating coatings 30 may also extend to the sides of all the battery units 20, i.e., in addition to covering the sides of the electrode current collecting layers 24, 25, the insulating coating 30 also covers the sides of the structural adhesives 26. The thermally conductive adhesive 40 is then applied to the insulating coatings 30.

[0051] In order to verify the heat dissipation performance of the present invention, a simulation test was carried out on a prismatic battery formed by placing in a case 50 (see [Fig.8]) the battery cell according to the invention with structural adhesives 10 arranged laterally and serving for heat dissipation, the temperature difference between the case 50 and the sides of the battery units 20 being calculated for verification purposes. In particular, the temperature difference can be calculated using the following formula:

[0052] . _ _ AX(Va) Al—K

[0053] where AX is the distance between two sampling points (m), qx / A, the heat flux (W / m2) and K, the effective thermal conductivity coefficient (W / m K).

[0054] Referring to [Fig.9], which shows the temperature difference curve calculated by this simulation. It can be clearly seen that over time, the temperature (the temperature difference) obtained by using the structure according to the invention is significantly lower than the temperature difference of the conventional structure. In other words, the temperature difference between the housing and the sides of the battery units of the present invention is lower than the temperature difference between the housing and the sides of the battery units of the conventional structure. Compared with the conventional structure, the thermal energy accumulated by the battery units located in the housing can be transferred into the housing by the thermally conductive adhesive to dissipate heat, thereby improving the heat dissipation efficiency of the battery units.

[0055] In summary, the present invention relates to a battery cell with laterally arranged structural adhesives for heat dissipation, wherein the resistance is reduced by directly stacking the electrode current collecting layers inside and the total energy density is increased by omitting the external electrically conductive contact terminals, while simultaneously coating the sides of the electrode current collecting layers with the insulating coatings to insulate the sides of the electrode current collecting layers and reduce the risk of a short circuit during internal series connection. Then, the thermally conductive adhesive is poured into the recesses between the insulating coatings and the structural adhesives and simultaneously covers the insulating coatings and the structural adhesives.At the same time, the thermally conductive adhesive contains thermally conductive particles capable of directly dissipating heat from the battery units to greatly reduce the contact thermal resistance between the battery units and the housing, thereby improving the heat dissipation efficiency of the battery units. In addition, the particles of the thermally conductive adhesive have at least two different particle sizes to achieve a dense stacking effect and thus further improve the resistance to external forces.

[0056] The above description represents only preferred embodiments of the invention and is not intended to limit the scope of protection. Any equivalent changes and modifications which, in accordance with the description and drawings of the invention, may be made by a person skilled in the art in this field, fall within the scope of protection of the present invention. List of reference figures

[0057]

[0058] 10 Battery cell

[0059] 20 Battery Unit

[0060] 201 Electrochemical system

[0061]

[0062]

[0063]

[0064]

[0065]

[0066]

[0067]

[0068] 21 Separation layer 22, 23 Active material layer 24, 25 Electrode current collecting layer 26 Structural adhesive 30 Insulating coating 301 Recess 40 Thermally conductive adhesive 50 Housing

Claims

Claims

1. Battery cell (10) with laterally arranged structural adhesives (26) for heat dissipation, said cell comprising: • a plurality of battery units (20) which are stacked on a single axis and each comprise the following: • two electrode current collecting layers (24, 25) which are arranged parallel to each other; • an electrochemical system (201), which is arranged between the two electrode current collecting layers (24, 25); • a structural adhesive (26), which is arranged between the two electrode current collecting layers (24, 25) and which surrounds the electrochemical system (201); and • two insulating coatings (30), which each cover the sides of the two electrode current collecting layers (24, 25);and • a thermally conductive adhesive (40), which surrounds the sides of the battery units (20) and covers the structural adhesives (26) and the insulating coatings and comprises thermally conductive particles, the particles having at least two different particle sizes.;

2. Battery cell (10) with laterally arranged structural adhesives for heat dissipation, according to claim 1, characterized in that the structural adhesive (26) and the two electrode current collecting layers (24, 25) serve as an encapsulation structure of a battery unit (20), so that in a battery unit (20) only a charge transfer takes place, but no electrochemical reaction takes place, and therefore the electrolyte systems of the electrochemical system (201) are not continuously connected to each other.

3. Battery cell (10) with laterally arranged structural adhesives (26) for heat dissipation, according to claim 1, characterized in that the structural adhesive (26) protrudes from the two electrode current collecting layers (24, 25).

4. Battery cell (10) with laterally arranged structural adhesives (26) for heat dissipation, according to one of claims 1 or 3, characterized in that the insulating coatings (30) further extend to the sides of the structural adhesives (26).

5. Battery cell (10) with laterally arranged structural adhesives (26) for heat dissipation, according to claim 3, characterized in that the structural adhesives (26) further protrude from the insulating coatings (30).

6. Battery cell (10) with laterally arranged structural adhesives (26) for heat dissipation, according to claim 5, characterized in that the thermally conductive adhesive (40) additionally fills the recesses (301) which are formed by the structural adhesives (26) of the battery units (20), which protrude from the electrode current collecting layers (24, 25).

7. Battery cell (10) with laterally arranged structural adhesives (26) for heat dissipation, according to one of claims 1 or 3, characterized in that the battery units (20) are arranged offset from each other, the insulating coatings (30) penetrating into the space between each two adjacent stacked electrode current collecting layers (24, 25) to close the exposed spaces, located between each two adjacent electrode current collecting layers (24, 25), and the side edges.

8. Battery cell (10) with laterally arranged structural adhesives (26) for heat dissipation, according to claim 7, characterized in that the insulating coatings (30) further extend to the sides of the structural adhesives (26).

9. Battery cell (10) with laterally arranged structural adhesives (26) for heat dissipation, according to claim 1, characterized in that a respective insulating coating (30) contains inorganic insulating particles, the particle size of the inorganic insulating particles being smaller than the particle size of the particles in the thermally conductive adhesive (40) and having the thermal conductivity.

10. Battery cell (10) with laterally arranged structural adhesives for heat dissipation, according to claim 1, characterized in that the thermally conductive adhesive (40) contains metal or metal oxide powder.