Battery device, electric device, and energy storage device

Abstract

This application provides a battery device, an electrical device, and an energy storage device. The battery device includes a housing, a battery cell assembly, a first thermally conductive adhesive, a thermally conductive component, and a second thermally conductive adhesive. The housing includes a support plate and a frame. The battery cell assembly includes multiple pouch battery cells stacked in a first direction, with a rated capacity of 50-300Ah, and has first, second, and third surfaces. The two first surfaces face each other along the first direction, and the second and third surfaces face each other along a second direction. The area of ​​the first surface is larger than that of the second and third surfaces. The support plate faces the second surface along the second direction. The second surface of the pouch battery cell is bonded to the support plate with the first thermally conductive adhesive, and the third surface is bonded to the thermally conductive component with the second thermally conductive adhesive. The thermally conductive component is located between adjacent cells along the first direction and connects to the support plate. The bonding area between the first thermally conductive adhesive and the second surface is 0.3-1 times that of the second surface; the bonding area between the third surface and the second thermally conductive adhesive is 0.3-1 times that of the third surface.

Description

Cross-references to related applications

[0001] This patent document claims priority and benefit to PCT patent application No. PCT / CN2026 / 076636, filed on February 2, 2026, entitled "Battery Cell, Battery Device, and Electrical Appliance". The entire contents of the aforementioned patent application are incorporated herein by reference as a part of the disclosure of this patent document. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a battery device, an electrical device, and an energy storage device. Background Technology

[0003] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0004] To improve the energy density of battery devices, pouch cells can be used. However, during the use of the battery device, pouch cells have limited heat dissipation capacity and poor temperature uniformity, which affects their cycle life. Summary of the Invention

[0005] This application provides a battery device, an electrical device, and an energy storage device that can improve the cycle life of a single pouch battery cell.

[0006] In a first aspect, embodiments of this application provide a battery device, including a housing, a battery cell assembly, a first thermally conductive adhesive, multiple thermally conductive components, and a second thermally conductive adhesive. The housing includes a support plate and a frame surrounding the support plate, with the support plate fixedly connected to the frame. The battery cell assembly is housed within the housing and includes multiple pouch battery cells stacked in a first direction. Each pouch battery cell has a rated capacity greater than or equal to 50 Ah and less than or equal to 300 Ah. The surface of each pouch battery cell includes a first surface, a second surface, and a third surface. The two first surfaces are arranged opposite each other along the first direction, and the second and third surfaces are arranged opposite each other along a second direction. The area of ​​the first surface is greater than the area of ​​the second surface, and the area of ​​the first surface is greater than the area of ​​the third surface. The first direction is perpendicular to the second direction. The support plate and the second surfaces of the multiple pouch battery cells are arranged opposite each other along the second direction. The first thermally conductive adhesive is used to bond the second surfaces of each pouch battery cell to the support plate. Multiple thermally conductive components are housed within a housing and arranged along a first direction. At least a portion of each thermally conductive component is located between adjacent pouch cell units along the first direction. The thermally conductive components are connected to a support plate. A second thermally conductive adhesive is used to bond the third surface of each pouch cell unit to the thermally conductive components.

[0007] In this embodiment, the pouch battery cell has advantages such as light weight, flexible design, and high energy density. Using pouch battery cells is beneficial for improving the energy density of the battery device. A rated capacity of 50Ah or greater for each pouch battery cell is beneficial for improving the energy density of the battery device; a rated capacity of 300Ah or less for each pouch battery cell is beneficial for reducing the current during charging and discharging, thus reducing heat generation in the pouch battery cell. The first thermally conductive adhesive, the second thermally conductive adhesive, and the thermally conductive component all have good thermal conductivity. Using the first thermally conductive adhesive to bond the second surface and the support plate can improve the heat exchange efficiency between the second surface and the support plate. Using the second thermally conductive adhesive to bond the third surface and the thermally conductive component allows heat from the third surface to be transferred to the support plate through the second thermally conductive adhesive and the thermally conductive component. Both the second and third surfaces can dissipate heat outward through the support plate, which helps reduce the temperature difference between the two ends of the pouch battery cell, improves the temperature uniformity of the pouch battery cell, and thus improves the cycle life of the pouch battery cell.

[0008] In some embodiments, the thermally conductive element is bonded to the support plate using a first thermally conductive adhesive. The first thermally conductive adhesive has good thermal conductivity, and using it to bond the thermally conductive element and the support plate can improve the heat transfer efficiency between them, which is beneficial for further reducing the temperature difference between the two ends of the pouch cell.

[0009] In some embodiments, the thermal conductivity of the first thermally conductive adhesive is 0.05 W / (m·K)-2 W / (m·K); and / or, the thermal conductivity of the second thermally conductive adhesive is 0.05 W / (m·K)-2 W / (m·K). The thermal conductivity of the first thermally conductive adhesive within the above range indicates good thermal conductivity, maintaining stable thermal conductivity even at high temperatures. This helps reduce the probability of the first thermally conductive adhesive failing due to temperature rise, leading to heat accumulation inside the pouch cell due to the inability to transfer heat from the second surface to the support plate for dissipation. This is beneficial for improving the cycle performance of the pouch cell during long-term cycling. Similarly, the thermal conductivity of the second thermally conductive adhesive within the above range indicates good thermal conductivity, maintaining stable thermal conductivity even at high temperatures. This helps reduce the probability of the second thermally conductive adhesive failing due to temperature rise, leading to poor temperature uniformity at both ends of the pouch cell due to the inability to transfer heat from the third surface to the support plate for dissipation. This is beneficial for improving the cycle performance and cycle life of the pouch cell during long-term cycling.

[0010] In some embodiments, the bonding area between the first thermally conductive adhesive and the second surface is 0.3-1 times the area of ​​the second surface; and / or, the bonding area between the third surface and the second thermally conductive adhesive is 0.3-1 times the area of ​​the third surface. A larger bonding area between the first thermally conductive adhesive and the second surface is beneficial for increasing the heat transfer area, improving heat transfer efficiency, and also for enhancing the connection strength between the first thermally conductive adhesive and the second surface, thereby improving the stability of the pouch cell. A larger bonding area between the second thermally conductive adhesive and the third surface is also beneficial for increasing the heat transfer area, improving heat transfer efficiency, and also for enhancing the connection strength between the second thermally conductive adhesive and the third surface, improving connection stability, and reducing the probability of connection failure affecting the effective heat dissipation of the third surface.

[0011] In some embodiments, the minimum thickness of the first thermally conductive adhesive is 0.4mm-4mm; and / or, the minimum thickness of the second thermally conductive adhesive is 0.4mm-4mm. A minimum thickness of 0.4mm or more for the first thermally conductive adhesive is beneficial for improving the connection strength between the second surface and the support plate, thus enhancing the stability of the individual cells in the pouch battery. A minimum thickness of 4mm or less for the first thermally conductive adhesive is beneficial for reducing the thermal resistance of the first thermally conductive adhesive, thereby improving thermal conductivity; it also helps to reduce the space occupied by the first thermally conductive adhesive, reducing its impact on the energy density of the battery device. A minimum thickness of 0.4mm or more for the second thermally conductive adhesive is beneficial for increasing the thermally conductive cross-sectional area, reducing thermal resistance, thus improving thermal conductivity; it also helps to improve adhesive strength, reducing the risk of breakage or detachment of the second thermally conductive adhesive; a minimum thickness of 4mm or less for the second thermally conductive adhesive is beneficial for reducing the space occupied by the second thermally conductive adhesive, reducing its impact on the energy density of the battery device.

[0012] In some embodiments, the minimum thickness of the first thermally conductive adhesive is greater than the minimum thickness of the second thermally conductive adhesive. A larger minimum thickness of the first thermally conductive adhesive is beneficial for improving the fixing strength between the pouch cell and the support plate, and for improving the stability of the pouch cell.

[0013] In some embodiments, the support plate includes a thermal management component bonded to a first thermally conductive adhesive and used to manage the temperature of the individual pouch cell. The first thermally conductive adhesive transfers heat from the second surface to the thermal management component, thereby dissipating heat through the thermal management component and improving heat dissipation efficiency.

[0014] In some embodiments, the support plate has a first heat exchange channel inside, which guides the flow of the heat exchange medium. The heat exchange medium can circulate through the support plate through the first heat exchange channel, so that the support plate can maintain a temperature difference with the pouch cell, thereby enabling the support plate to continuously and efficiently exchange heat with the pouch cell.

[0015] In some embodiments, the heat-conducting component includes a first heat-conducting portion and at least two second heat-conducting portions, each second heat-conducting portion being arranged along a first direction. At least one pouch cell is disposed between two adjacent second heat-conducting portions of the heat-conducting component. The first heat-conducting portion connects two adjacent second heat-conducting portions, and the two ends of the second heat-conducting portions along a second direction are respectively connected to the first heat-conducting portion and a support plate. The pouch cell located between two adjacent second heat-conducting portions of the heat-conducting component is a first pouch cell, and the third surface of the first pouch cell is bonded to the first heat-conducting portion by a second thermally conductive adhesive. The first heat-conducting portion is located on one side of the first pouch cell along the second direction, which helps to increase the bonding area between the third surface of the first pouch cell and the first heat-conducting portion, improve heat transfer efficiency, and thus improve the heat dissipation effect of the third surface of the first pouch cell. Two adjacent second heat-conducting portions are respectively connected to both sides of the first heat-conducting portion along the first direction, and the two second heat-conducting portions can form two heat transfer paths between the first heat-conducting portion and the support plate, which helps to improve heat transfer efficiency and improve the heat dissipation effect of the third surface of the pouch cell. The heat-conducting component has a U-shaped structure. It can conduct some of the heat from the pouch battery cells to the support plate, and also protect and constrain the pouch battery cells, improving their stability. When the battery device is subjected to external impact, it reduces the movement of the pouch battery cells, thereby improving the reliability and stability of the battery device.

[0016] In some embodiments, the first thermally conductive portion and two second thermally conductive portions enclose a cavity, and at least one second thermally conductive adhesive is accommodated in the cavity. The second thermally conductive adhesive accommodated in the cavity is bonded to the third surface of the first soft-pack battery cell, the first thermally conductive portion, and the two second thermally conductive portions. This increases the thermal conductivity area between the second thermally conductive adhesive accommodated in the cavity and the thermally conductive components, thereby improving thermal conductivity efficiency.

[0017] In some embodiments, in a first direction, at least one pouch cell is disposed between two adjacent heat-conducting components; the pouch cell located between the two heat-conducting components is a second pouch cell, and the third surface of the second pouch cell is bonded to the second heat-conducting portion of the heat-conducting component by a second thermally conductive adhesive. The second thermally conductive adhesive can fill a portion of the gap between the second pouch cell and the second heat-conducting portion in the second direction away from the support plate, thereby forming a heat-conducting path between the third surface of the second pouch cell and the second heat-conducting portion, improving heat conduction efficiency.

[0018] In some embodiments, the second thermally conductive adhesive bonded to the third surface of the second pouch cell is also bonded to the first thermally conductive portion. The fact that the second thermally conductive adhesive bonded to the third surface of the second pouch cell is simultaneously bonded to both the first and second thermally conductive portions increases the thermally conductive area and improves the thermal conductivity.

[0019] In some embodiments, two pouch cell batteries are disposed between two second thermally conductive portions of the thermally conductive element; two pouch cell batteries are disposed between two adjacent thermally conductive elements. In this way, each pouch cell battery can be bonded to the thermally conductive element by the second thermally conductive adhesive, which helps to improve the temperature uniformity of multiple pouch cell battery cells, and can also reduce the number of thermally conductive elements, simplify the structure of the battery device, and improve its energy density.

[0020] In some embodiments, the battery device further includes multiple heat insulation components, and the second thermally conductive portions of the multiple heat insulation components and multiple thermally conductive components are alternately arranged along a first direction. A pouch cell is disposed between the heat insulation components and the second thermally conductive portions; the heat insulation components are bonded to a second thermally conductive adhesive. The heat insulation components can block heat transfer between two adjacent pouch cell units, reducing heat accumulation. In the event of thermal runaway in a pouch cell, the heat insulation components can also slow down heat propagation. The arrangement of the heat insulation components also facilitates the formation of gaps between two adjacent pouch cell units located on both sides of the heat insulation components, which facilitates the filling of a portion of the first thermally conductive adhesive between two adjacent pouch cell units, and also facilitates the filling of a portion of the second thermally conductive adhesive between two adjacent pouch cell units, thereby increasing the thermally conductive area and improving the thermal conductivity.

[0021] In some embodiments, the battery device further includes a reinforcing plate located on the side of the battery cell assembly away from the support plate along the second direction. A second thermally conductive adhesive is disposed between the first thermally conductive part and the reinforcing plate, and the thermally conductive adhesive between the first thermally conductive part and the reinforcing plate is bonded to the first thermally conductive part and the reinforcing plate. Multiple thermally conductive components can be connected by the reinforcing plate, improving the stability and structural strength of the battery cell assembly, thereby increasing the structural strength of the battery device. The second thermally conductive adhesive can transfer some of the heat from the first thermally conductive part to the reinforcing plate for heat dissipation, which helps to shorten the heat dissipation path on the third surface and improve the heat dissipation effect.

[0022] In some embodiments, the battery device further includes a reinforcing plate located on the side of the battery cell assembly away from the support plate along the second direction, and the reinforcing plate is bonded to a second thermally conductive adhesive. Bonding the reinforcing plate to the second thermally conductive adhesive helps to improve the structural strength of the battery cell assembly. Some of the heat from the third surface can be transferred to the reinforcing plate through the second thermally conductive adhesive, or through the thermally conductive elements and the second thermally conductive adhesive, thereby dissipating heat through the reinforcing plate and improving the heat dissipation effect of the third surface.

[0023] In some embodiments, the reinforcing plate has a second heat exchange channel inside, which guides the flow of the heat exchange medium. The heat exchange medium can circulate through the reinforcing plate through the second heat exchange channel, so that the reinforcing plate can maintain a temperature difference with the pouch cell, thereby enabling the reinforcing plate to continuously and efficiently exchange heat with the pouch cell.

[0024] In some embodiments, the pouch battery cell includes a packaging bag, an electrode assembly, an electrode terminal, and a first insulating member. The electrode assembly is housed within the packaging bag, and the electrode assembly has a tab at one end along a third direction. One end of the electrode terminal is located inside the packaging bag, and the other end is located outside the packaging bag. The electrode terminal is welded to the tab. The first insulating member surrounds the electrode terminal and is disposed between the electrode terminal and the packaging bag. The first insulating member is sealed to the packaging bag. The first direction, the second direction, and the third direction are perpendicular to each other.

[0025] In some embodiments, the packaging bag includes a packaging body and an encapsulation portion disposed along the outer periphery of the packaging body. The electrode assembly is housed within the packaging body. The encapsulation portion includes a first encapsulation portion and a second encapsulation portion. The first encapsulation portion is disposed on at least one side of the packaging body along a third direction, and the second encapsulation portion is disposed on the side of the packaging body away from the support plate along a second direction. The second encapsulation portion includes a portion of a third surface. A second thermally conductive adhesive covers at least a portion of the second encapsulation portion. Covering at least a portion of the second encapsulation portion with the second thermally conductive adhesive can improve the sealing effect of the second encapsulation portion and reduce the risk of sealing failure of the second encapsulation portion.

[0026] In some embodiments, the side of the packaging body facing the support plate along the second direction does not have a sealing portion, which helps to reduce the sealing edge and improve the sealing effect. The second surface can be entirely located on the packaging body, which helps to improve the stability and reliability of the bonding between the first thermally conductive adhesive and the soft-pack battery cell.

[0027] In some embodiments, the packaging bag includes a stacked encapsulation layer, a metal layer, and a protective layer. The encapsulation layer is located on the surface of the metal layer facing the electrode assembly and is fused to a first insulating member. By providing a multi-layer structure, the strength and weight of the packaging bag can be balanced, thereby increasing the energy density of the pouch battery cell. The metal layer can reduce the penetration of water and oxygen into the interior of the packaging bag, reduce the decomposition of the electrolyte and the degree of oxidation of the electrode materials, thereby improving the lifespan of the pouch battery cell.

[0028] In some embodiments, the encapsulation layer is made of polypropylene, and the protective layer is made of one or more of nylon and polyethylene terephthalate.

[0029] In some embodiments, the pouch cell includes a packaging bag and an electrode assembly contained within the packaging bag. The electrode assembly includes a positive electrode film layer, which includes a positive electrode active material. The positive electrode active material includes a lithium-containing transition metal phosphate. Lithium-containing transition metal phosphates, as positive electrode active materials, have advantages such as high safety, long cycle life, low cost, and high high-temperature stability.

[0030] In some embodiments, the positive electrode film layer includes a conductive agent, which includes carbon nanotubes, and the carbon nanotubes include one or more of single-walled carbon nanotubes, few-walled carbon nanotubes, and multi-walled carbon nanotubes.

[0031] In some embodiments, the pouch cell includes a packaging bag, an electrode assembly contained within the packaging bag, and an electrolyte contained within the packaging bag. The electrolyte includes dimethyl carbonate, which helps to reduce the viscosity of the electrolyte, enhance ionic conductivity, optimize the low-temperature performance of the pouch cell, and improve the rate performance of the pouch cell.

[0032] In some embodiments, a pouch cell includes a packaging bag and an electrode assembly contained within the packaging bag. The electrode assembly includes at least one positive electrode, at least one negative electrode, and a separator, with the separator disposed between the positive and negative electrodes. The separator includes a base film, an inorganic particle layer, and an adhesive layer. The inorganic particle layer is disposed on at least one side of the base film, and the adhesive layer is disposed on the side of at least one inorganic particle layer away from the base film. The adhesive layer is a continuous porous layer comprising a vinylidene fluoride polymer. This embodiment of the application uses a continuous porous layer as the adhesive layer to improve the adhesion between the separator and the electrode while maintaining the air permeability and porosity of the separator, thereby improving the stability of the electrode, increasing the density and rigidity of the electrode assembly, reducing the risk of misalignment of the positive and negative electrodes, and improving the cycle performance of the pouch cell.

[0033] In some embodiments, the vinylidene fluoride polymer includes one or more of vinylidene fluoride homopolymers and copolymers of vinylidene fluoride and hexafluoropropylene.

[0034] In some embodiments, the dimension W0 of the pouch cell in the second direction is 100mm-150mm; the dimension H0 of the pouch cell in the first direction is 14mm-22mm; and the dimension L0 of the pouch cell in the third direction is 500mm-1250mm. The first, second, and third directions are perpendicular to each other. Having the dimensions of the pouch cell within these ranges is beneficial for optimizing the arrangement of the pouch cells, improving space utilization, and increasing the energy density of the battery device.

[0035] In some embodiments, the shear strength of the first thermally conductive adhesive is greater than or equal to 7 MPa, and the tensile strength of the first thermally conductive adhesive is greater than or equal to 7 MPa; and / or, the shear strength of the second thermally conductive adhesive is greater than or equal to 7 MPa, and the tensile strength of the second thermally conductive adhesive is greater than or equal to 7 MPa. The high shear and tensile strength of the first thermally conductive adhesive is beneficial for improving the bond strength between the second surface and the support plate, reducing the risk of cracking or detachment of the first thermally conductive adhesive, improving the fatigue resistance of the first thermally conductive adhesive, and improving the stability and reliability of the bond between the second surface and the support plate. Similarly, the high shear and tensile strength of the second thermally conductive adhesive is beneficial for improving the bond strength between the third surface and the thermally conductive component, reducing the risk of cracking or detachment of the second thermally conductive adhesive, improving the fatigue resistance of the second thermally conductive adhesive, and improving the stability and reliability of the bond between the third surface and the thermally conductive component.

[0036] In some embodiments, the first thermally conductive adhesive is made of polyurethane, and the second thermally conductive adhesive is also made of polyurethane. The second thermally conductive adhesive having the above-mentioned components exhibits good toughness, elasticity, and adhesion, resulting in high bond strength and resistance to cracking.

[0037] Secondly, embodiments of this application provide an electrical device that includes a battery device provided in any of the embodiments of the first aspect, the battery device being used to provide electrical energy.

[0038] Thirdly, embodiments of this application provide an energy storage device, which includes the battery device provided in any of the embodiments of the first aspect, the battery device being used to store electrical energy. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0040] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application; Figure 3 These are exploded views of battery devices provided in some embodiments of this application; Figure 4 This is a schematic diagram of the structure of a single soft-pack battery cell of a battery device provided in some embodiments of this application; Figure 5 yes Figure 4 The exploded view of a single pouch cell is shown. Figure 6 yes Figure 4 A cross-sectional view of the electrode assembly of the shown pouch cell. Figure 7 This is a top view of a partial structure of a battery device provided in some embodiments of this application; Figure 8 It is along Figure 7 A sectional view taken along direction AA in the middle; Figure 9 yes Figure 8 Enlarged schematic diagram of region B in the middle; Figure 10 yes Figure 9 Enlarged schematic diagram of region D in the middle; Figure 11 This is a partial structural cross-sectional view of a battery device provided in some embodiments of this application; Figure 12This is a partial structural schematic diagram of a battery device provided in some embodiments of this application; Figure 13 yes Figure 12 Enlarged schematic diagram of region E in the middle; Figure 14 This is a partial exploded view of the battery device provided in some embodiments of this application; Figure 15 This is a partial structural cross-sectional view of a battery device provided in other embodiments of this application; Figure 16 This is a partial cross-sectional schematic diagram of a single pouch battery cell of a battery device provided in some embodiments of this application; Figure 17 This is a schematic diagram of the separator of a soft-pack battery cell in a battery device provided in some embodiments of this application; Figure 18 This is a schematic diagram of the surface morphology of the separator of a soft-pack battery cell in an embodiment of the battery device provided in this application.

[0041] The annotations in the attached figures are explained as follows: 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Energy storage device; 6. Cabinet; 30. Battery cell assembly; 10. Soft-pack battery cell; 10A. First soft-pack battery cell; 10B. Second soft-pack battery cell; 10a. First surface; 10b. Second surface; 10c. Third surface; 10c1. First region; 10c2. Second region. 11. Packaging bag; 111. Packaging film; 1111. Sealing edge; 11111. First sealing edge; 11112. Second sealing edge; 1112. Bottom wall; 1113. Peripheral wall; 11131. First side wall; 11132. Second side wall; 11a. Sealing layer; 11b. Metal layer; 11c. Protective layer. 12. Electrode assembly; 121. Positive electrode sheet; 1211. Positive current collector; 1212. Positive electrode film; 122. Negative electrode sheet; 1221. Negative current collector; 1222. Negative electrode film; 123. Separator; 1231. Base film; 1232. Inorganic particle layer; 1233. Adhesive layer; 124. Tab; 1241. Positive tab; 1242. Negative tab; 13. Electrode terminal; 131. Positive terminal; 132. Negative terminal; 14. First insulating component; 15. Packaging body; 16. Encapsulation part; 161. First encapsulation part; 162. Second encapsulation part; 20. Housing; 21. Support plate; 211. Thermal management components; 212. First heat exchange channel; 22. Frame; 23. Cover plate; 40. First thermally conductive adhesive; 50. Second thermally conductive adhesive; 60. Thermally conductive component; 61. First thermally conductive section; 62. Second thermally conductive section; 621. Straight section; 622. Bending section; 63. Cavity; 70. Thermal insulation component; 80. Reinforcing plate; 81. Second heat exchange channel. X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0044] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0048] In this application, "multiple" means two or more (including two).

[0049] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of battery devices, the market demand is also constantly increasing.

[0050] A battery device typically refers to a single physical module comprising multiple battery cells connected in series and / or parallel to provide higher voltage and capacity. A battery cell can be the smallest unit that makes up a battery device. A battery cell can be a rechargeable battery, which is a battery cell that can be recharged after discharge to activate its active materials and continue to be used.

[0051] Pouch cells offer advantages such as light weight, flexible design, and high energy density. Using pouch cells helps improve the energy density of battery devices. In this application, multiple pouch cells can be directly integrated and assembled within the battery device's housing, eliminating the need for traditional module structures, reducing redundant components, improving space utilization, and further enhancing the energy density of the battery device.

[0052] A typical pouch battery cell includes a packaging bag, electrode assemblies, and electrode terminals. The electrode assemblies are housed within the packaging bag, and the electrode terminals are connected to the electrode assemblies, with a portion of the electrode terminals extending outside the packaging bag. Compared to metal casings, packaging bags made of metal-plastic film have lower heat dissipation capabilities. The module-less design of the battery pack results in a more compact arrangement of pouch battery cells, which also reduces the heat dissipation efficiency of the pouch battery cells, leading to higher internal temperatures within the pouch battery cells.

[0053] The casing typically includes a support plate to hold the individual pouch cells. Heat from the end of the pouch cell closest to the support plate can be transferred to the plate and then dissipated outwards. However, the end of the pouch cell furthest from the support plate is more difficult to dissipate heat, resulting in a larger temperature difference between the two ends of the cell and affecting its cycle life.

[0054] In view of this, this application provides a technical solution that uses thermally conductive adhesive and thermally conductive components to transfer the heat from the end of the pouch battery cell away from the support plate to the support plate, thereby dissipating heat outward through the support plate. This helps to reduce the temperature difference between the two ends of the pouch battery cell, improve the temperature uniformity of the pouch battery cell, and thus improve the cycle life of the pouch battery cell.

[0055] The battery devices described in this application are applicable to electrical devices that use battery devices. Electrical devices can be equipment that uses a battery device as a power source or various energy storage systems that use a battery device as an energy storage element. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0056] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0057] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application.

[0058] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0059] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0060] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0061] Figure 2 This is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application.

[0062] Reference Figure 2 This application provides an energy storage device 5, including one or more battery clusters to increase the voltage and capacity of the energy storage device 5. The battery clusters may include multiple battery devices 2, which are connected in series via a busbar to increase the voltage of the energy storage device 5. When the energy storage device 5 includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 5.

[0063] The energy storage device 5 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. The energy storage device 5 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 5 can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours.

[0064] In some embodiments, the energy storage device 5 is an energy storage container or an energy storage cabinet.

[0065] In some embodiments, the energy storage device 5 may include a cabinet 6 and one or more battery clusters, the battery clusters being housed in the cabinet 6.

[0066] In some embodiments, the energy storage device 5 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0067] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 2 via pipelines for regulating the temperature of the individual pouch cells.

[0068] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0069] As an example, the central control module can serve as the battery management unit for the energy storage device 5, used to monitor and manage the energy storage device 5. The central control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device 5. For example, it can control the charging and discharging current and voltage of the energy storage device 5. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0070] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems. As an example, the power distribution device can be used to distribute power to the power modules of the energy storage device 5.

[0071] Figure 3 These are exploded views of battery devices provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of a single soft-pack battery cell of a battery device provided in some embodiments of this application. Figure 5 yes Figure 4 The exploded view of a single pouch cell is shown. Figure 6 yes Figure 4 A cross-sectional view of the electrode assembly of the shown pouch cell.

[0072] Reference Figures 3 to 6 This application provides a battery device 2, which includes a housing 20 and a plurality of pouch battery cells 10, wherein the plurality of pouch battery cells 10 are housed within the housing 20.

[0073] The pouch battery cell 10 can be a rechargeable battery cell, which refers to a pouch battery cell 10 that can be recharged after discharge to activate the active materials and continue to be used. As an example, the pouch battery cell 10 can be a lithium-ion battery cell.

[0074] Multiple pouch battery cells 10 are connected in series, parallel, or in a mixed configuration via a busbar. A mixed configuration refers to multiple pouch battery cells 10 being connected in both series and parallel configurations.

[0075] A pouch battery cell 10 refers to a battery cell that uses a flexible packaging film (such as aluminum-plastic film) as its outer casing. Compared to battery cells with metal casings, pouch battery cells 10 are lighter and have more flexible shapes. Pouch battery cells 10 can be rectangular, square, or other irregular shapes.

[0076] The battery device 2 includes one or more battery cell assemblies, which include pouch cell 10 stacked in a first direction X. The battery cell assembly can be formed by directly fixing multiple pouch cell 10s to a housing 20 within the housing 20.

[0077] In some embodiments, the housing 20 includes a support plate 21 and a frame 22 disposed around the outer periphery of the support plate 21, wherein the support plate 21 and the frame 22 are fixedly connected. The support plate 21 and the frame 22 can be integrally formed or independently formed. Optionally, the support plate 21 can be welded to the frame 22 to achieve a fixed connection between the support plate 21 and the frame 22.

[0078] The support plate 21 can be used to support the soft-pack battery cell 10.

[0079] In some embodiments, the frame 22 includes a plurality of side beams, which are connected sequentially along the circumference of the frame 22.

[0080] In some embodiments, the housing 20 further includes a cover plate 23 connected to the frame 22. The cover plate 23 and the support plate 21 are respectively connected to the frame 22, so that the interior of the housing 20 forms a closed space to accommodate the battery cell assembly.

[0081] In some embodiments, the housing 20 may be part of the vehicle's chassis structure. For example, a portion of the housing 20 may be at least a portion of the vehicle's floor, or a portion of the housing 20 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0082] In some embodiments, the rated capacity of each pouch cell 10 is greater than or equal to 50 Ah and less than or equal to 300 Ah. The rated capacity of the pouch cell 10 has a meaning known in the art and can be tested using methods known in the art, or obtained from the battery device instruction manual.

[0083] As an example, at 25°C, the soft-pack battery is charged to 3.65V at a charging rate of 0.5C, which is the nominal capacity of the single cell. Then, it is charged to 0.05C at a constant voltage of 3.65V and left to stand for 10 minutes. Then, it is discharged to 2.5V at a discharge rate of 1C and left to stand for 10 minutes. The capacity C during the discharge process is calculated using the formula C=I×t, and the unit is Ah.

[0084] As an example, the rated capacity of the pouch cell 10 is 50Ah, 80Ah, 100Ah, 120Ah, 150Ah, 180Ah, 200Ah, 220Ah, 250Ah, 280Ah, 300Ah, or any value between two of the above.

[0085] The rated capacity of each pouch battery cell 10 is greater than or equal to 50Ah, which is beneficial to improving the energy density of the battery device 2; the rated capacity of each pouch battery cell 10 is less than or equal to 300Ah, which is beneficial to reducing the current of the pouch battery cell 10 during charging and discharging, reducing the heat generation of the pouch battery cell 10, and improving the cycle life and fast charging capability of the pouch battery cell 10.

[0086] In some embodiments, the pouch cell 10 includes a packaging bag 11 and an electrode assembly 12, the electrode assembly 12 being housed within the packaging bag 11. The electrode assembly 12 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0087] In some embodiments, the packaging bag 11 includes two packaging films 111, with a receiving cavity formed between the two packaging films 111, and the electrode assembly 12 is received in the receiving cavity.

[0088] At least one packaging film 111 is provided with a receiving recess, and the receiving cavity includes the receiving recess. In some examples, only one packaging film 111 is provided with a receiving recess. In other examples, both packaging films 111 are provided with receiving recesses, the two receiving recesses are disposed opposite to each other, and the receiving cavity includes the two receiving recesses.

[0089] In some embodiments, the receiving recess can be formed by stamping the packaging film 111.

[0090] In some embodiments, the two packaging films 111 are integrally formed. As an example, the two packaging films 111 can be formed by folding a single aluminum-plastic film.

[0091] In some alternative embodiments, the two packaging films 111 are separate structures. As an example, the two packaging films 111 are two aluminum-plastic films.

[0092] In some embodiments, each packaging film 111 includes an encapsulation edge 1111 surrounding the receiving cavity, and the encapsulation edges 1111 of two packaging films 111 are stacked and connected to seal the receiving cavity.

[0093] In some embodiments, the sealing edges 1111 of the two packaging films 111 are welded together by hot pressing.

[0094] In some embodiments, each packaging film 111 has two first packaging edges 11111 and at least one second packaging edge 11112. The two first packaging edges 11111 are located on both sides of the receiving cavity along the third direction Z, and the second packaging edge 11112 is located on both sides of the receiving cavity along the second direction Y. The second packaging edge 11112 connects the two first packaging edges 11111.

[0095] The sealing edges 1111 of two packaging films 111 are connected to form a sealing portion. The sealing portion includes two first sealing portions and at least one second sealing portion. The two first sealing portions are located on opposite sides of the receiving cavity along a third direction Z, and the second sealing portion is located on one side of the receiving cavity along a second direction Y. The first sealing portion includes a first sealing edge 11111 of one packaging film 111 and a first sealing edge 11111 of the other packaging film 111, and the two first sealing edges 11111 of the first sealing portion are at least partially fused together. The second sealing portion includes a second sealing edge 11112 of one packaging film 111 and a second sealing edge 11112 of the other packaging film 111, and the two second sealing edges 11112 of the second sealing portion are at least partially fused together.

[0096] In some examples, the encapsulation section includes two second encapsulation sections. In other examples, the encapsulation section includes a second encapsulation section, where a second encapsulation edge 11112 of one packaging film 111 and a second encapsulation edge 11112 of another packaging film 111 are fused together, and the other second encapsulation edge 11112 of one packaging film 111 and the other second encapsulation edge 11112 of another packaging film 111 are integrally connected (e.g., at a fold in the aluminum-plastic film).

[0097] In some embodiments, the packaging film 111 includes a bottom wall 1112 and a peripheral wall 1113. The peripheral wall 1113 is connected to the outer periphery of the bottom wall 1112, and the bottom wall 1112 and the peripheral wall 1113 enclose a receiving recess. The peripheral wall 1113 includes two first sidewalls 11131 disposed opposite each other along a third direction Z and two second sidewalls 11132 disposed opposite each other along a second direction Y. The two first sidewalls 11131 are respectively connected to two first encapsulation edges 11111, and the two second sidewalls 11132 are respectively connected to two second encapsulation edges 11112.

[0098] In some embodiments, the second encapsulation portion is bent toward and adhered to the second sidewall 11132. By bending the second encapsulation portion, the space occupied by the second encapsulation portion in the second direction Y can be reduced.

[0099] In some embodiments, the electrode assembly 12 includes a positive electrode 121 and a negative electrode 122. During the charging and discharging process of the pouch cell 10, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode 121 and the negative electrode 122. The electrolyte acts as a conductor for ions between the positive electrode 121 and the negative electrode 122.

[0100] In some embodiments, the positive electrode 121 includes a positive current collector 1211 and a positive electrode film 1212, with the positive electrode film 1212 disposed on at least one side of the positive current collector 1211. As an example, the positive current collector 1211 has two surfaces opposite each other in its own thickness direction, and the positive electrode film 1212 is disposed on either or both of the two opposite surfaces of the positive current collector 1211.

[0101] As an example, the positive current collector 1211 can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0102] In some embodiments, the positive electrode active material comprises lithium transition metal phosphate particles.

[0103] Lithium-containing transition metal phosphates refer to phosphate materials containing lithium and transition metal elements, and can be detected by any method known in the art. For example, they can be detected by combining X-ray diffraction (XRD) with energy dispersive spectroscopy (EDS) or inductively coupled plasma mass spectrometry (ICP-MS).

[0104] Lithium-containing transition metal phosphates, as positive electrode active materials, have advantages such as high safety, long cycle life, low cost, and high high temperature stability.

[0105] In some embodiments, the pouch cell 10 is a lithium iron phosphate battery.

[0106] In some embodiments, the negative electrode 122 includes a negative electrode current collector 1221 and a negative electrode film layer 1222, with the negative electrode film layer 1222 disposed on at least one side of the negative electrode current collector 1221. As an example, the negative electrode current collector 1221 has two surfaces opposite each other in its own thickness direction, and the negative electrode film layer 1222 is disposed on either or both of the two opposite surfaces of the negative electrode current collector 1221.

[0107] As an example, the negative electrode current collector 1221 can be made of metal foil, conductive polymer material, carbon material, or composite current collector. For example, as a metal foil, pure metal, alloy, or surface-treated metal can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0108] In some embodiments, the negative electrode film layer 1222 includes a negative electrode active material. The negative electrode active material includes graphite. As an example, the graphite may include at least one of artificial graphite and natural graphite.

[0109] In some embodiments, the negative electrode active material may further include at least one of the following materials: soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys.

[0110] In some embodiments, the positive current collector 1211 may be made of aluminum, and the negative current collector 1221 may be made of copper.

[0111] In some embodiments, the electrode assembly 12 further includes a separator 123 disposed between the positive electrode 121 and the negative electrode 122.

[0112] In some embodiments, the separator 123 is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0113] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer can be the same or different. The separator 123 can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0114] In some embodiments, the pouch cell 10 further includes an electrolyte that acts as a conductor of ions between the positive and negative electrodes. The electrolyte includes an electrolyte salt and a solvent.

[0115] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0116] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0117] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the pouch cell, additives that improve the high-temperature performance of the pouch cell, and additives that improve the low-temperature performance of the pouch cell.

[0118] In some embodiments, the electrode assembly 12 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0119] In some embodiments, the electrode assembly 12 is a wound structure. The positive electrode 121 and the negative electrode 122 are wound into a wound structure.

[0120] In some embodiments, the electrode assembly 12 has a stacked structure.

[0121] As an example, multiple positive electrode plates 121 and multiple negative electrode plates 122 can be set, and multiple positive electrode plates 121 and multiple negative electrode plates 122 can be stacked alternately.

[0122] As an example, multiple positive electrode plates 121 can be provided, and multiple negative electrode plates 122 can be folded to form multiple stacked folded segments, with a positive electrode plate 121 sandwiched between adjacent folded segments.

[0123] As an example, both the positive electrode 121 and the negative electrode 122 are folded to form multiple stacked folded segments.

[0124] As an example, multiple separators 123 can be provided, respectively disposed between any adjacent positive electrode 121 or negative electrode 122.

[0125] As an example, the separator 123 can be continuously arranged and disposed between any adjacent positive electrode 121 or negative electrode 122 by means of folding or rolling.

[0126] Figure 7 This is a top view of a partial structure of a battery device provided in some embodiments of this application. Figure 8 It is along Figure 7 The sectional view taken from direction AA in the middle. Figure 9 yes Figure 8 An enlarged schematic diagram of region B in the middle. Figure 10 yes Figure 9 An enlarged schematic diagram of region D in the middle. Figure 11 This is a partial structural cross-sectional view of a battery device provided in some embodiments of this application. Figure 12 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application. Figure 13 yes Figure 12 An enlarged schematic diagram of region E in the middle. Figure 14 yes Figure 7 The exploded view of a partial structure of the battery device shown. Figure 15 This is a partial structural cross-sectional view of a battery device provided in other embodiments of this application. Figure 16 This is a partial cross-sectional schematic diagram of a single pouch battery cell of a battery device provided in some embodiments of this application. Figure 17This is a schematic diagram of the separator of a pouch cell in a battery device provided in some embodiments of this application. Figure 18 This is a schematic diagram of the surface morphology of the separator of a soft-pack battery cell in an embodiment of the battery device provided in this application.

[0127] Reference Figures 3 to 18 This application provides a battery device 2, which includes a housing 20, a battery cell assembly 30, a first thermally conductive adhesive 40, a second thermally conductive adhesive 50, and a plurality of thermally conductive components 60. The housing 20 includes a support plate 21 and a frame 22 surrounding the outer periphery of the support plate 21, with the support plate 21 and the frame 22 fixedly connected. The battery cell assembly 30 is housed within the housing 20 and includes a plurality of pouch battery cells 10 stacked in a first direction X. Each pouch battery cell 10 has a rated capacity greater than or equal to 50 Ah and less than or equal to 300 Ah. The surface of the pouch battery cell 10 includes a first surface 10a, a second surface 10b, and a third surface 10c. The two first surfaces 10a are arranged opposite each other along the first direction X, and the second surface 10b and the third surface 10c are arranged opposite each other along the second direction Y. The area of ​​the first surface 10a is larger than the area of ​​the second surface 10b, and the area of ​​the first surface 10a is larger than the area of ​​the third surface 10c. The first direction X is perpendicular to the second direction Y. The support plate 21 and the second surfaces 10b of the plurality of pouch battery cells 10 are arranged opposite each other along the second direction Y. The second surfaces 10b of each pouch battery cell 10 are bonded to the support plate 21 by the first thermally conductive adhesive 40. A plurality of thermally conductive elements 60 are housed in the housing 20. The plurality of thermally conductive elements 60 are arranged along the first direction X, and at least a portion of each thermally conductive element 60 is located between adjacent pouch battery cells 10 along the first direction X. The thermally conductive elements 60 are connected to the support plate 21. The third surface 10c of each pouch battery cell 10 is bonded to the thermally conductive element 60 by the second thermally conductive adhesive 50.

[0128] The number of battery cell modules 30 can be one or more. For example, multiple battery cell modules 30 are arranged along a third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other.

[0129] The surface of the pouch cell 10 includes two first surfaces 10a, which are arranged opposite to each other along a first direction X. The thickness direction of the pouch cell 10 is parallel to the first direction X, and the first surface 10a is the surface with the largest area of ​​the pouch cell 10. Optionally, the first surface 10a is a plane.

[0130] Two first surfaces 10a are formed on two packaging films 111 respectively. As an example, both packaging films 111 are provided with receiving recesses, and the two first surfaces 10a are formed on the bottom walls 1112 of the two packaging films 111 respectively.

[0131] The first surfaces 10a of multiple pouch cell 10 are arranged along the first direction X.

[0132] Along the second direction Y, the second surface 10b is closer to the support plate 21 than the third surface 10c. The second surface 10b faces the support plate 21, while the third surface 10c faces away from the support plate 21.

[0133] As an example, at least a portion of the second surface 10b is formed on the second sidewall 11132. Alternatively, a portion of the second surface 10b is formed on the second sidewall 11132, and another portion of the second surface 10b is formed on the second encapsulation portion.

[0134] As an example, at least a portion of the third surface 10c is formed on the second encapsulation portion 162. Optionally, the third surface 10c includes a first region 10c1 and a second region 10c2, the first region 10c1 being formed on the second encapsulation portion 162 and the second region 10c2 being formed on the second sidewall 11132.

[0135] Along the second direction Y, at least a portion of the first thermally conductive adhesive 40 is located between the second surface 10b and the support plate 21, and is bonded to the second surface 10b and the support plate 21.

[0136] The heat-conducting component 60 and the support plate 21 can be connected by adhesive, welding, snap-fit, plug-in or other means.

[0137] In one example, a plurality of heat-conducting elements 60 are spaced apart along a first direction X, and at least one pouch cell 10 is disposed between two adjacent heat-conducting elements 60. In another example, a plurality of heat-conducting elements 60 are arranged sequentially along the first direction X, and each heat-conducting element 60 surrounds the outside of at least one pouch cell 10.

[0138] In one example, the heat-conducting element 60 may be integrally located between two adjacent pouch cell units 10 along the first direction X. Optionally, the heat-conducting element 60 is flat.

[0139] In another example, a portion of the heat-conducting element 60 is located between two adjacent pouch cell 10 along the first direction X, and a portion of the heat-conducting element 60 may, for example, be located on the side of the pouch cell 10 away from the support plate 21 along the second direction Y. Optionally, the heat-conducting element 60 is U-shaped or L-shaped.

[0140] At least a portion of the heat-conducting element 60 is located between adjacent pouch cell 10 along the first direction X. The first surfaces 10a of the two pouch cell 10 disposed opposite each other can contact or connect with the heat-conducting element 60. The heat-conducting element 60 has good thermal conductivity and transfers heat from the first surface 10a to the support plate 21, which then dissipates heat outward, thereby reducing the temperature of the pouch cell 10.

[0141] Optionally, the heat-conducting element 60 is made of metal, which helps to improve its thermal conductivity. For example, the heat-conducting element 60 can be made of steel, aluminum, or composite materials.

[0142] The second thermally conductive adhesive 50 may cover at least a portion of the third surface 10c. Optionally, the second thermally conductive adhesive 50 may extend along the first direction X to the thermally conductive element 60 and bond to the thermally conductive element 60. Optionally, a portion of the thermally conductive element 60 is located on the side of the pouch cell 10 away from the support plate 21 along the second direction Y, and the second thermally conductive adhesive 50 is provided between the thermally conductive element 60 and the third surface 10c along the second direction Y, bonding the thermally conductive element 60 and the third surface 10c.

[0143] The materials of the first thermally conductive adhesive 40 and the second thermally conductive adhesive 50 can be the same or different.

[0144] The thermal conductivity of the first thermally conductive adhesive 40 and the second thermally conductive adhesive 50 can be the same or different.

[0145] The minimum thickness of the first thermally conductive adhesive 40 can be greater than, less than or equal to the minimum thickness of the second thermally conductive adhesive 50.

[0146] In this embodiment, the pouch battery cell 10 has advantages such as light weight, flexible design, and high energy density. Using the pouch battery cell 10 is beneficial to improving the energy density of the battery device 2. The rated capacity of each pouch battery cell 10 is greater than or equal to 50Ah, which is beneficial to improving the energy density of the battery device 2; the rated capacity of each pouch battery cell 10 is less than or equal to 300Ah, which is beneficial to reducing the current of the pouch battery cell 10 during charging and discharging, and reducing the heat generation of the pouch battery cell 10. The first thermally conductive adhesive 40, the second thermally conductive adhesive 50, and the thermally conductive element 60 all have good thermal conductivity. Using the first thermally conductive adhesive 40 to bond the second surface 10b and the support plate 21 can improve the heat exchange efficiency between the second surface 10b and the support plate 21. Using the second thermally conductive adhesive 50 to bond the third surface 10c and the thermally conductive element 60 can transfer the heat of the third surface 10c to the support plate 21 through the second thermally conductive adhesive 50 and the thermally conductive element 60. Both the second surface 10b and the third surface 10c can dissipate heat outward through the support plate 21, which helps to reduce the temperature difference between the two ends of the pouch battery cell 10, improve the temperature uniformity of the pouch battery cell 10, and thus improve the cycle life of the pouch battery cell 10.

[0147] The first thermally conductive adhesive 40 can bond each soft-pack battery cell 10 to the support plate 21, which is beneficial to improve the stability of the soft-pack battery cell 10 and increase the strength and rigidity of the battery device 2; it can also realize the integrated assembly of multiple soft-pack battery cells 10, eliminating the traditional module structure, reducing redundant parts, and improving space utilization, thereby increasing the energy density of the battery device 2.

[0148] The heat-conducting component 60 is connected to the support plate 21, which can improve the heat transfer efficiency between the heat-conducting component 60 and the support plate 21, as well as improve the stability of the heat-conducting component 60 and increase the structural strength of the battery device 2.

[0149] By setting multiple heat-conducting components 60, the thermal management effect of the battery device 2 can be improved, and the temperature consistency of the pouch battery cells 10 can be enhanced. The first thermally conductive adhesive 40, the second thermally conductive adhesive 50, and the multiple heat-conducting components 60 can connect multiple pouch battery cells 10 into a whole, and connect this whole to the support plate 21, which helps to improve the structural strength of the battery device 2.

[0150] In some embodiments, the thickness of the heat-conducting element 60 is 0.2 mm to 1.5 mm. Optionally, the thickness of the heat-conducting element 60 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, or any value between two of these.

[0151] In this embodiment, the thickness of the heat-conducting component 60 is set to be greater than or equal to 0.2 mm, which is beneficial to improve the structural strength of the heat-conducting component 60, enhance the reliability of the battery device 2, reduce the thermal resistance of the heat-conducting component 60, and improve the thermal conductivity of the heat-conducting component 60. Setting the thickness of the heat-conducting component 60 to be less than or equal to 1.5 mm is beneficial to reduce its space occupation and reduce the impact of the setting of the heat-conducting component 60 on the energy density.

[0152] In some embodiments, refer to Figure 11 The heat-conducting component 60 is bonded to the support plate 21 by the first heat-conducting adhesive 40.

[0153] The first thermally conductive adhesive 40 can be bonded to at least one of the surfaces of the thermally conductive member 60 along the first direction X and the surfaces of the thermally conductive member 60 opposite to the support plate 21 along the second direction Y.

[0154] Optionally, along the second direction Y, a portion of the first thermally conductive adhesive 40 is located between the thermally conductive element 60 and the support plate 21 and bonds the thermally conductive element 60 and the support plate 21, and a portion of the first thermally conductive adhesive 40 is located between the second surface 10b and the support plate 21 and bonds the second surface 10b and the support plate 21.

[0155] The heat-conducting component 60 is bonded to the support plate 21 by the first thermally conductive adhesive 40, which simplifies the assembly of the battery device 2 and improves production efficiency. For example, the first thermally conductive adhesive 40 can be uniformly coated on the surface of the support plate 21. After the heat-conducting component 60 and the battery cell assembly 30 are installed into the housing 20, the first thermally conductive adhesive 40 bonds the second surface 10b of each pouch battery cell 10 and the heat-conducting component 60 to the support plate 21.

[0156] The first thermally conductive adhesive 40 has good thermal conductivity. By using the first thermally conductive adhesive 40 to bond the thermally conductive component 60 and the support plate 21, the heat transfer efficiency between the thermally conductive component 60 and the support plate 21 can be improved, which is conducive to further reducing the temperature difference between the two ends of the soft-pack battery cell 10.

[0157] In some embodiments, the thermal conductivity of the first thermally conductive adhesive 40 is 0.05 W / (m·K)-2 W / (m·K).

[0158] Optionally, the thermal conductivity of the first thermally conductive adhesive 40 at 85°C is 0.05 W / (m·K)-2 W / (m·K).

[0159] The thermal conductivity of the first thermally conductive adhesive 40 at 85°C can be tested using methods known in the art. As an example, the transient hot disk method (Hot Disk) can be used, according to ISO 22007-2. A temperature probe with a self-heating function is placed under a sample disc with a diameter greater than 30 mm and a thickness greater than 2 mm. Standard weights from Hengzhong Company are used to press down on the sample disc. During the test, a constant heating power is applied to the nickel coil of the probe, causing its temperature to rise. Since the temperature coefficient of resistance (TCR) of nickel is linear (ΔR / R0 = αΔT), the heat loss can be obtained by measuring the change in resistance, thereby determining the thermal conductivity of the sample at 85°C.

[0160] As an example, at 85°C, the thermal conductivity of the first thermally conductive adhesive 40 can be selected as 0.05 W / (m·K), 0.10 W / (m·K), 0.15 W / (m·K), 0.20 W / (m·K), 0.25 W / (m·K), 0.30 W / (m·K), 0.35 W / (m·K), 0.40 W / (m·K), 0.45 W / (m·K), 0.50 W / (m·K), 0.55 W / (m·K), 0.60 W / (m·K), 0.65 W / (m·K), or 0.70 W / (m·K). 0.75W / (m·K), 0.80W / (m·K), 0.85W / (m·K), 0.90W / (m·K), 0.95W / (m·K), 1.0W / (m·K), 1.1W / (m·K), 1.2W / (m·K), 1.3W / (m·K), 1.4W / (m·K), 1.5W / (m·K), 1.6W / (m·K), 1.7W / (m·K), 1.8W / (m·K), 1.9W / (m·K), 2.0W / (m·K), or any range between the two.

[0161] The thermal conductivity of the first thermally conductive adhesive 40 is within the above-mentioned range, which has good thermal conductivity and can still conduct heat stably at high temperatures. This helps to reduce the probability that the first thermally conductive adhesive 40 will fail due to temperature rise, and that heat will not be able to be transferred from the second surface 10b to the support plate 21 for heat dissipation in time, resulting in heat accumulation inside the soft-pack battery cell 10. This is beneficial to improving the cycle performance of the soft-pack battery cell 10 during long-cycle processes.

[0162] In some embodiments, the thermal conductivity of the second thermally conductive adhesive 50 is 0.05 W / (m·K)-2 W / (m·K).

[0163] Optionally, the thermal conductivity of the second thermally conductive adhesive 50 at 85°C is 0.05 W / (m·K)-2 W / (m·K).

[0164] The thermal conductivity of the second thermally conductive adhesive 50 at 85°C can be tested using methods known in the art. As an example, the transient hot disk method (Hot Disk) can be used, according to ISO 22007-2. A temperature probe with a self-heating function is placed under a sample disc with a diameter greater than 30 mm and a thickness greater than 2 mm. Standard weights from Hengzhong Company are used to press down on the sample disc. During the test, a constant heating power is applied to the nickel coil of the probe, causing its temperature to rise. Since the temperature coefficient of resistance (TCR) of nickel is linear (ΔR / R0 = αΔT), the heat loss can be obtained by measuring the change in resistance, thereby determining the thermal conductivity of the sample at 85°C.

[0165] As an example, at 85°C, the thermal conductivity of the second thermally conductive adhesive 50 can be selected as 0.05 W / (m·K), 0.10 W / (m·K), 0.15 W / (m·K), 0.20 W / (m·K), 0.25 W / (m·K), 0.30 W / (m·K), 0.35 W / (m·K), 0.40 W / (m·K), 0.45 W / (m·K), 0.50 W / (m·K), 0.55 W / (m·K), 0.60 W / (m·K), 0.65 W / (m·K), or 0.70 W / (m·K). 0.75W / (m·K), 0.80W / (m·K), 0.85W / (m·K), 0.90W / (m·K), 0.95W / (m·K), 1.0W / (m·K), 1.1W / (m·K), 1.2W / (m·K), 1.3W / (m·K), 1.4W / (m·K), 1.5W / (m·K), 1.6W / (m·K), 1.7W / (m·K), 1.8W / (m·K), 1.9W / (m·K), 2.0W / (m·K), or any range between the two.

[0166] The thermal conductivity of the second thermally conductive adhesive 50 is within the above range, which gives it good thermal conductivity. It can still conduct heat stably at high temperatures, which helps to reduce the probability of the second thermally conductive adhesive 50 failing due to temperature rise, and consequently causing the heat to be unable to be transferred from the third surface 10c to the support plate 21 for heat dissipation in time, resulting in poor temperature uniformity at both ends of the soft-pack battery cell 10. This helps to improve the cycle performance of the soft-pack battery cell 10 in long-cycle processes and improve cycle life.

[0167] In some embodiments, under the same temperature conditions, the thermal conductivity of the first thermally conductive adhesive 40 and the thermal conductivity of the second thermally conductive adhesive 50 may be the same or different.

[0168] In some embodiments, under the same temperature conditions, the thermal conductivity of the second thermally conductive adhesive 50 is higher than that of the first thermally conductive adhesive 40.

[0169] In some embodiments, the bonding area between the first thermally conductive adhesive 40 and the second surface 10b is 0.3 to 1 times the area of ​​the second surface 10b.

[0170] Optionally, the ratio between the bonding area between the first thermally conductive adhesive 40 and the second surface 10b and the total area of ​​the second surface 10b is 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, or any value between any two of these.

[0171] The bonding area between the first thermally conductive adhesive 40 and the second surface 10b is greater than or equal to 0.3 times the total area of ​​the second surface 10b. The larger bonding area is beneficial to expanding the heat transfer area between the second surface 10b and the first thermally conductive adhesive 40, improving heat transfer efficiency, and also to enhancing the connection strength between the first thermally conductive adhesive 40 and the second surface 10b, thereby improving the stability of the soft-pack battery cell 10.

[0172] In some embodiments, the bonding area between the third surface 10c and the second thermally conductive adhesive 50 is 0.3-1 times the area of ​​the third surface 10c.

[0173] Optionally, the ratio between the bonding area between the second thermally conductive adhesive 50 and the third surface 10c and the total area of ​​the third surface 10c is 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, or any value between any two of these.

[0174] In this embodiment, the bonding area between the second thermally conductive adhesive 50 and the third surface 10c is set to be greater than or equal to 0.3 times the total area of ​​the third surface 10c. The larger bonding area between the second thermally conductive adhesive 50 and the third surface 10c is beneficial to expanding the heat transfer area and improving the heat transfer efficiency. It is also beneficial to enhance the connection strength between the second thermally conductive adhesive 50 and the third surface 10c, improve the connection stability, and reduce the probability of connection failure affecting the effective heat dissipation of the third surface 10c.

[0175] In some embodiments, the minimum thickness of the first thermally conductive adhesive 40 is 0.4 mm to 4 mm. The minimum thickness of the first thermally conductive adhesive 40 refers to the minimum dimension of the first thermally conductive adhesive 40 along the second direction Y.

[0176] The first thermally conductive adhesive 40 can be of uniform thickness or non-uniform thickness.

[0177] The minimum thickness of the first thermally conductive adhesive 40 can be 0.4mm, 0.5mm, 0.6mm, 0.65mm, 0.7mm, 0.71mm, 0.72mm, 0.73mm, 0.74mm, 0.75mm, 0.76mm, 0.77mm, 0.78mm, 0.79mm, 0.8mm, 0.81mm, 0.82mm, 0.83mm, 0.84mm, 0.85mm, 0.86mm, 0.87mm, 0.88mm, 0.89mm, 0.9mm, 0.95mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, or any value between two of these.

[0178] In this embodiment, the minimum thickness of the first thermally conductive adhesive 40 is set to be greater than or equal to 0.4 mm, which helps to improve the connection strength between the second surface 10b and the support plate 21, and enhances the stability of the soft-pack battery cell 10. In this embodiment, the minimum thickness of the first thermally conductive adhesive 40 is set to be less than or equal to 4 mm, which helps to reduce the thermal resistance of the first thermally conductive adhesive 40, thereby improving thermal conductivity; it also helps to reduce the space occupied by the first thermally conductive adhesive 40, reducing its impact on the energy density of the battery device 2.

[0179] In some embodiments, the minimum thickness of the second thermally conductive adhesive 50 is 0.4 mm to 4 mm. The minimum thickness of the second thermally conductive adhesive 50 refers to the minimum dimension of the second thermally conductive adhesive 50 along the second direction Y.

[0180] The second thermally conductive adhesive 50 can be of uniform thickness or non-uniform thickness.

[0181] The minimum thickness of the second thermally conductive adhesive 50 can be 0.4mm, 0.5mm, 0.6mm, 0.65mm, 0.7mm, 0.71mm, 0.72mm, 0.73mm, 0.74mm, 0.75mm, 0.76mm, 0.77mm, 0.78mm, 0.79mm, 0.8mm, 0.81mm, 0.82mm, 0.83mm, 0.84mm, 0.85mm, 0.86mm, 0.87mm, 0.88mm, 0.89mm, 0.9mm, 0.95mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, or any value between two of these.

[0182] The second thermally conductive adhesive 50 transfers heat from the third surface 10c to the thermally conductive component 60 along the first direction X. In this embodiment, the minimum thickness of the second thermally conductive adhesive 50 is set to be greater than or equal to 0.4 mm, which helps to increase the thermally conductive cross-sectional area, reduce thermal resistance, and thus improve thermal conductivity. It also helps to improve adhesive strength and reduce the risk of breakage or detachment of the second thermally conductive adhesive 50. In this embodiment, the minimum thickness of the second thermally conductive adhesive 50 is set to be less than or equal to 4 mm, which helps to reduce the space occupied by the second thermally conductive adhesive 50 and reduce the impact on the energy density of the battery device 2.

[0183] In some embodiments, the minimum thickness of the first thermally conductive adhesive 40 is greater than the minimum thickness of the second thermally conductive adhesive 50.

[0184] The first thermally conductive adhesive 40 fixes the soft-pack battery cell 10 to the support plate 21. The first thermally conductive adhesive 40 has a relatively large minimum thickness, which helps to improve the fixing strength between the soft-pack battery cell 10 and the support plate 21 and improve the stability of the soft-pack battery cell 10.

[0185] In some embodiments, refer to Figure 8 and Figure 11 The support plate 21 includes a thermal management component 211, which is bonded to the first thermally conductive adhesive 40 and is used to manage the temperature of the soft-pack battery cell 10.

[0186] The thermal management component 211 can exchange heat with the pouch cell 10, thereby regulating the temperature of the pouch cell 10 and improving its cycle performance. As an example, the thermal management component 211 has a flow channel inside, through which the heat exchange medium exchanges heat with the pouch cell 10 as it flows through the flow channel.

[0187] The thermal management component 211 is bonded to the first thermally conductive adhesive 40, which transfers the heat from the second surface 10b to the thermal management component 211, thereby dissipating heat through the thermal management component 211 and improving heat dissipation efficiency.

[0188] In some embodiments, the thermal management component 211 is used to support multiple pouch cell 10s. The thermal management component 211 serves as the bottom wall of the housing 20 and is connected to the frame 22. The thermal management component 211 can serve both support and thermal management functions, which helps to reduce the number of structural components and improve the energy density of the battery device 2.

[0189] In some other embodiments, the support plate 21 further includes a substrate (not shown), and along the second direction Y, a thermal management component 211 is disposed between the battery cell assembly 30 and the substrate, the substrate being connected to the frame 22.

[0190] In some embodiments, the support plate 21 has a first heat exchange channel 212 inside, which is used to guide the flow of the heat exchange medium.

[0191] The first heat exchange channel 212 can be a channel through which the heat exchange medium can circulate. By setting the first heat exchange channel 212 in the support plate 21, the heat exchange medium can circulate through the support plate 21 through the first heat exchange channel 212, so that the support plate 21 can maintain a temperature difference with the soft-pack battery cell 10, thereby enabling the support plate 21 to continuously and efficiently exchange heat with the soft-pack battery cell 10.

[0192] Optionally, there can be multiple first heat exchange channels 212, which is beneficial to increase the flow rate of the heat exchange medium in the support plate 21, improve the heat exchange capacity of the support plate 21 and the soft-pack battery cell 10, and improve the heat exchange effect.

[0193] Optionally, the multiple first heat exchange channels 212 are arranged at equal intervals, which helps to improve the temperature consistency of multiple pouch cell 10.

[0194] In some embodiments, refer to Figures 12 to 14 The heat-conducting component 60 includes a first heat-conducting part 61 and two second heat-conducting parts 62, which are arranged along a first direction X. At least one pouch battery cell 10 is disposed between the two second heat-conducting parts 62 of the heat-conducting component 60. The first heat-conducting part 61 connects the two second heat-conducting parts 62, and the two ends of the second heat-conducting parts 62 along a second direction Y are respectively connected to the first heat-conducting part 61 and the support plate 21. The pouch battery cell 10 located between the two second heat-conducting parts 62 of the heat-conducting component 60 is a first pouch battery cell 10A, and the third surface 10c of the first pouch battery cell 10A is bonded to the first heat-conducting part 61 by a second thermally conductive adhesive 50.

[0195] The first heat-conducting part 61 and the two second heat-conducting parts 62 are connected to form a U-shaped structure. The heat-conducting element 60 has an opening on the side facing the support plate 21 along the second direction Y. The second surface 10b of the first soft-pack battery cell 10A is exposed to the outside of the heat-conducting element 60 through the opening and is bonded to the support plate 21 by the first thermally conductive adhesive 40.

[0196] In one example, both the first heat-conducting part 61 and the second heat-conducting part 62 are flat plates. In another example, the second heat-conducting part 62 includes a straight part 621 and a curved part 622. The straight part 621 is disposed between two adjacent pouch cell 10, and the curved part 622 connects the straight part 621 and the first heat-conducting part 61.

[0197] Optionally, the first heat-conducting part 61 and the two second heat-conducting parts 62 are integrally formed.

[0198] Optionally, the end of the second heat-conducting part 62 away from the first heat-conducting part 61 along the second direction Y is bonded to the support plate 21. Optionally, the end of the second heat-conducting part 62 away from the first heat-conducting part 61 along the second direction Y is bonded to the support plate 21 by the first thermally conductive adhesive 40.

[0199] The first pouch cell 10A located between the two second thermally conductive portions 62 of a thermally conductive element 60 can be one or more. Along the second direction Y, at least a portion of the second thermally conductive adhesive 50 is located between the third surface 10c of the first pouch cell 10A and the first thermally conductive portion 61, and bonds the third surface 10c of the first pouch cell 10A and the first thermally conductive portion 61.

[0200] At least a portion of each of the second heat-conducting portions 62 of the heat-conducting element 60 is located between two adjacent pouch cell 10. The adjacent second heat-conducting portions 62 of the two heat-conducting elements 60 are spaced apart along the first direction X, and at least one pouch cell 10 is provided between the adjacent second heat-conducting portions 62 of the two heat-conducting elements 60.

[0201] The soft-pack battery cell 10 located between the adjacent second heat-conducting portions 62 of two adjacent heat-conducting components 60 is a second soft-pack battery cell 10B. The third surface 10c of the second soft-pack battery cell 10B can be bonded to at least one of the first heat-conducting portion 61 and the second heat-conducting portion 62 by the second thermally conductive adhesive 50.

[0202] There are multiple second thermally conductive adhesives 50, with at least one second thermally conductive adhesive 50 bonding the third surface 10c of the first soft-pack battery cell 10A and the thermally conductive component 60, and at least one second thermally conductive adhesive 50 bonding the third surface 10c of the second soft-pack battery cell 10B and the thermally conductive component 60.

[0203] The first heat-conducting part 61 is located on one side of the first soft-pack battery cell 10A along the second direction Y, which helps to increase the bonding area between the third surface 10c of the first soft-pack battery cell 10A and the first heat-conducting part 61, improve the heat transfer efficiency, and thus improve the heat dissipation effect of the third surface 10c of the first soft-pack battery cell 10A.

[0204] Two second heat-conducting parts 62 are respectively connected to the first heat-conducting part 61 on both sides along the first direction X. The two second heat-conducting parts 62 can form two heat transfer paths between the first heat-conducting part 61 and the support plate 21, which is beneficial to improve heat transfer efficiency and improve the heat dissipation effect of the third surface 10c of the soft-pack battery cell 10.

[0205] The heat-conducting component 60 has a U-shaped structure. The heat-conducting component 60 can conduct part of the heat of the soft-pack battery cell 10 to the support plate 21, and can also protect and constrain the soft-pack battery cell 10, improve the stability of the soft-pack battery cell 10, reduce the movement of the soft-pack battery cell 10 when the battery device 2 is subjected to external impact, and improve the reliability and stability of the battery device 2.

[0206] In some embodiments, refer to Figures 12 to 14 The first thermally conductive part 61 and the two second thermally conductive parts 62 enclose a cavity 63. At least one second thermally conductive adhesive 50 is housed in the cavity 63. The second thermally conductive adhesive 50 housed in the cavity 63 is bonded to the third surface 10c of the first soft-pack battery cell 10A, the first thermally conductive part 61, and the two second thermally conductive parts 62. This increases the thermal conductivity area between the second thermally conductive adhesive 50 housed in the cavity 63 and the thermally conductive element 60, thereby improving the thermal conductivity efficiency.

[0207] Optionally, along the second direction Y, a portion of the second thermally conductive adhesive 50 housed in the cavity 63 is located between the third surface 10c of the first pouch cell 10A and the first thermally conductive portion 61, and bonds the third surface 10c and the first thermally conductive portion 61. The second thermally conductive adhesive 50 housed in the cavity 63 extends at least one end along the first direction X to the second thermally conductive portion 62 and bonds the second thermally conductive portion 62.

[0208] Optionally, along the first direction X, a portion of the second thermally conductive adhesive 50 contained in the cavity 63 is located between the first surface 10a and the second thermally conductive portion 62 of the first soft-pack battery cell 10A and bonds the first surface 10a and the second thermally conductive portion 62.

[0209] In some embodiments, refer to Figures 12 to 14 In the first direction X, at least one soft-pack battery cell 10 is provided between two adjacent heat-conducting components 60. The soft-pack battery cell 10 located between the two heat-conducting components 60 is a second soft-pack battery cell 10B, and the third surface 10c of the second soft-pack battery cell 10B is bonded to the second heat-conducting part 62 of the heat-conducting component 60 by a second thermally conductive adhesive 50.

[0210] A second soft-pack battery cell 10B can be provided between two adjacent heat-conducting components 60, or multiple second soft-pack battery cells 10B can be provided.

[0211] There are multiple second thermally conductive adhesives 50, with at least one second thermally conductive adhesive 50 disposed on the outside of the cavity 63 and bonded to the third surface 10c and the second thermally conductive part 62 of the second soft-pack battery cell 10B.

[0212] The third surface 10c of the second soft-pack battery cell 10B can be bonded to the second thermally conductive part 62 of one of the two adjacent thermally conductive parts 60 by the second thermally conductive adhesive 50, or it can be bonded to the second thermally conductive part 62 of the two adjacent thermally conductive parts 60 by the second thermally conductive adhesive 50.

[0213] Optionally, along the first direction X, a portion of the second thermally conductive adhesive 50 is located between the first surface 10a and the second thermally conductive portion 62 of the second soft-pack battery cell 10B, and bonds the first surface 10a and the second thermally conductive portion 62. The second thermally conductive adhesive 50 can fill the gap between the first surface 10a and the second thermally conductive portion 62, and transfer the heat of the first surface 10a to the second thermally conductive portion 62, thereby transferring it to the support plate 21.

[0214] The second thermally conductive adhesive 50 can fill part of the gap between the second soft-pack battery cell 10B and the second thermally conductive part 62, thereby forming a thermally conductive path between the third surface 10c of the second soft-pack battery cell 10B and the second thermally conductive part 62, and improving the thermal conductivity.

[0215] In some embodiments, refer to Figure 15 The second thermally conductive adhesive 50, which is bonded to the third surface 10c of the second soft-pack battery cell 10B, is also bonded to the first thermally conductive portion 61. Optionally, the second thermally conductive adhesive 50 bonded to the third surface 10c of the second soft-pack battery cell 10B is partially located on the side of the first thermally conductive portion 61 away from the support plate 21 along the second direction Y.

[0216] The second thermally conductive adhesive 50, which is bonded to the third surface 10c of the second soft-pack battery cell 10B, is also bonded to the first thermally conductive part 61 and the second thermally conductive part 62, which can increase the thermally conductive area and improve the thermal conductivity.

[0217] In some embodiments, the second thermally conductive adhesive 50 extends continuously along the first direction X and is bonded to the third surface 10c of a plurality of second pouch cell 10B and the first thermally conductive portion 61 of a plurality of thermally conductive elements.

[0218] In some embodiments, refer to Figures 12 to 14 Two pouch battery cells 10 are disposed between the two second heat-conducting parts 62 of the heat-conducting component 60. Two pouch battery cells 10 are disposed between two adjacent heat-conducting components 60.

[0219] Two pouch cell 10s positioned between two second heat-conducting portions 62 of the heat-conducting element 60 can exchange heat with the two second heat-conducting portions 62 of the heat-conducting element 60, respectively. Two pouch cell 10s positioned between two adjacent heat-conducting elements 60 can exchange heat with the adjacent second heat-conducting portions 62 of the two adjacent heat-conducting elements 60 that are close to each other. In this way, each pouch cell 10 can be bonded to the heat-conducting element 60 by the second thermally conductive adhesive 50, which helps to improve the temperature uniformity of multiple pouch cell 10s, reduces the number of heat-conducting elements 60, simplifies the structure of the battery device 2, and increases its energy density.

[0220] In some embodiments, refer to Figure 14 The battery device 2 also includes multiple heat insulation components 70, and the second heat-conducting portions 62 of the multiple heat insulation components 70 and multiple heat-conducting components 60 are arranged alternately along the first direction X. A soft-pack battery cell 10 is disposed between the heat insulation components 70 and the second heat-conducting portions 62. The heat insulation components 70 are bonded to the second thermally conductive adhesive 50.

[0221] For example, two first soft-pack battery cells 10A are disposed between the two second heat-conducting portions 62 of the heat-conducting component 60, and a heat insulation component 70 is disposed between the two first soft-pack battery cells 10A. Two second soft-pack battery cells 10B are disposed between two adjacent heat-conducting components 60, and a heat insulation component 70 is disposed between the two second soft-pack battery cells 10B.

[0222] Optionally, the material of the thermal insulation component 70 is any one of nano-insulation material, glass fiber insulation material, and ceramic fiber insulation material.

[0223] Optionally, the thickness of the heat insulation element 70 along the first direction X is 1mm-4mm.

[0224] The heat insulation component 70 can block heat transfer between two adjacent pouch cell 10, reducing heat accumulation. In the event of thermal runaway in a pouch cell 10, the heat insulation component 70 can also slow down heat propagation.

[0225] The arrangement of the heat insulation component 70 also facilitates the formation of a gap between two adjacent soft-pack battery cells 10 located on both sides of the heat insulation component 70, which facilitates a portion of the first thermally conductive adhesive 40 filling between the two adjacent soft-pack battery cells 10, and also facilitates a portion of the second thermally conductive adhesive 50 filling between the two adjacent soft-pack battery cells 10, thereby increasing the thermal conductivity area and improving the thermal conductivity effect.

[0226] In some embodiments, refer to Figure 15The battery device 2 also includes a reinforcing plate 80, which is located on the side of the battery cell assembly 30 away from the support plate 21 along the second direction Y. A second thermally conductive adhesive 50 is provided between the first thermally conductive part 61 and the reinforcing plate 80, and the second thermally conductive adhesive 50 located between the first thermally conductive part 61 and the reinforcing plate 80 is bonded to the first thermally conductive part 61 and the reinforcing plate 80.

[0227] Optionally, the reinforcing plate 80 is connected to the cover plate 23, or the reinforcing plate 80 and the cover plate 23 are integrally formed. Alternatively, the reinforcing plate 80 may also be a plate body independent of the cover plate 23.

[0228] The number of reinforcing plates 80 can be one or more. One reinforcing plate 80 can be provided for one battery cell assembly 30, or multiple reinforcing plates 80 can be provided.

[0229] In one example, only a portion of the first thermally conductive portion 61 of the thermally conductive element 60 is bonded to the reinforcing plate 80 using the second thermally conductive adhesive 50. In another example, the first thermally conductive portion 61 of all the thermally conductive elements 60 corresponding to the battery cell assembly 30 is bonded to the reinforcing plate 80 using the second thermally conductive adhesive 50.

[0230] Optionally, along the first direction X, the size of the reinforcing plate 80 is greater than or equal to the size of the battery cell assembly 30, so that the reinforcing plate 80 can bond as many first thermally conductive parts 61 of the thermally conductive elements 60 as possible with the second thermally conductive adhesive 50.

[0231] The reinforcing plate 80 is bonded to the first thermally conductive part 61 of multiple thermally conductive parts 60 by the second thermally conductive adhesive 50. Multiple thermally conductive parts 60 can be connected by the reinforcing plate 80, thereby improving the stability and structural strength of the battery cell assembly 30 and thus improving the structural strength of the battery device 2.

[0232] The second thermally conductive adhesive 50 can transfer some of the heat from the first thermally conductive part 61 to the reinforcing plate 80, and dissipate heat through the reinforcing plate 80, which helps to shorten the heat dissipation path of the third surface 10c and improve the heat dissipation effect.

[0233] In some embodiments, refer to Figure 15 The battery device 2 also includes a reinforcing plate 80, which is located on the side of the battery cell assembly 30 away from the support plate 21 along the second direction Y, and the reinforcing plate 80 is bonded to the second thermally conductive adhesive 50.

[0234] The reinforcing plate 80 can be bonded to at least a portion of the third surface 10c of the soft-pack battery cell 10 by the second thermally conductive adhesive 50, or to the first thermally conductive part 61 of the thermally conductive component 60 by the second thermally conductive adhesive 50, or to the third surface 10c and the first thermally conductive part 61 by the second thermally conductive adhesive 50.

[0235] The reinforcing plate 80 is bonded to the second thermally conductive adhesive 50, which helps to improve the structural strength of the battery cell assembly 30. Some of the heat from the third surface 10c can be transferred to the reinforcing plate 80 through the second thermally conductive adhesive 50, or through the thermally conductive component 60 and the second thermally conductive adhesive 50, thereby dissipating heat through the reinforcing plate 80 and improving the heat dissipation effect of the third surface 10c.

[0236] In some embodiments, refer to Figure 15 The reinforcing plate 80 has a second heat exchange channel 81 inside, which is used to guide the flow of the heat exchange medium.

[0237] The second heat exchange channel 81 can be a channel through which the heat exchange medium can circulate. By providing the second heat exchange channel 81 in the reinforcing plate 80, the heat exchange medium can circulate through the reinforcing plate 80 through the second heat exchange channel 81, so that the reinforcing plate 80 can maintain the temperature difference with the soft-pack battery cell 10, thereby enabling the reinforcing plate 80 to continuously and efficiently exchange heat with the soft-pack battery cell 10.

[0238] Optionally, there can be multiple second heat exchange channels 81, which helps to increase the flow rate of the heat exchange medium in the reinforcing plate 80, improve the heat exchange capacity of the reinforcing plate 80 and the soft-pack battery cell 10, and improve the heat exchange effect.

[0239] Optionally, multiple second heat exchange channels 81 are arranged at equal intervals, which helps to improve the uniformity of heat exchange.

[0240] In some embodiments, the shear strength of the first thermally conductive adhesive 40 is greater than or equal to 7 MPa, and the tensile strength of the first thermally conductive adhesive 40 is greater than or equal to 7 MPa.

[0241] For example, the tensile strength of the first thermally conductive adhesive 40 can be tested with reference to the test method in the national standard GB / T1040.3 "Test of tensile properties of plastics".

[0242] For example, the shear strength of the first thermally conductive adhesive 40 can be obtained according to the national standard GB / T 7124-2008, and the specific testing method can be referred to the national standard GB / T 7124-2008.

[0243] The first thermally conductive adhesive 40 has high shear strength and tensile strength, which helps to improve the bonding strength between the second surface 10b and the support plate 21, reduce the risk of cracking or falling off the first thermally conductive adhesive 40, improve the fatigue resistance of the first thermally conductive adhesive 40, and improve the stability and reliability of the bonding between the second surface 10b and the support plate 21.

[0244] In some embodiments, the shear strength of the second thermally conductive adhesive 50 is greater than or equal to 7 MPa, and the tensile strength of the second thermally conductive adhesive 50 is greater than or equal to 7 MPa.

[0245] For example, the tensile strength of the second thermally conductive adhesive 50 can be tested with reference to the test method in the national standard GB / T1040.3 "Test of Tensile Properties of Plastics".

[0246] For example, the shear strength of the second thermally conductive adhesive 50 can be obtained according to the national standard GB / T 7124-2008, and the specific testing method can be referred to the national standard GB / T 7124-2008.

[0247] The second thermally conductive adhesive 50 has high shear strength and tensile strength, which helps to improve the bonding strength between the third surface 10c and the thermally conductive component 60, reduce the risk of cracking or falling off the second thermally conductive adhesive 50, improve the fatigue resistance of the second thermally conductive adhesive 50, and improve the stability and reliability of the bonding between the third surface 10c and the thermally conductive component 60.

[0248] In some embodiments, the first thermally conductive adhesive 40 is a structural adhesive. The second thermally conductive adhesive 50 is a structural adhesive.

[0249] In some embodiments, the first thermally conductive adhesive 40 is made of polyurethane, and the second thermally conductive adhesive 50 is also made of polyurethane. The first thermally conductive adhesive 40, having the above-mentioned components, exhibits good toughness, elasticity, and adhesion, resulting in high bond strength and resistance to cracking. The second thermally conductive adhesive 50, having the above-mentioned components, also exhibits good toughness, elasticity, and adhesion, resulting in high bond strength and resistance to cracking.

[0250] In some embodiments, refer to Figure 5 and Figure 16 The soft-pack battery cell 10 includes a packaging bag 11, an electrode assembly 12, an electrode terminal 13, and a first insulating member 14. The electrode assembly 12 is housed within the packaging bag 11. The electrode assembly 12 has a tab 124 at its end along the third direction Z. One end of the electrode terminal 13 is located inside the packaging bag 11, and the other end is located outside the packaging bag 11. The electrode terminal 13 is welded to the tab 124. The first insulating member 14 surrounds the electrode terminal 13 and is disposed between the electrode terminal 13 and the packaging bag 11. The first insulating member 14 is sealed to the packaging bag 11. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0251] The tab 124 can conduct current from the electrode assembly 12. The electrode assembly 12 may have multiple tabs 124, which may include a positive tab 1241 and a negative tab 1242.

[0252] As an example, the positive current collector 1211 includes at least one positive tab, at least a portion of which is not covered by the positive electrode film layer 1212. The positive tab portion 1241 includes a plurality of positive tabs stacked together.

[0253] As an example, the negative electrode current collector 1221 includes at least one negative electrode tab, at least a portion of which is not covered by the negative electrode film layer 1222. The negative electrode tab portion 1242 includes a plurality of negative electrode tabs stacked together.

[0254] There can be one or more positive electrode tabs 1241. There can be one or more negative electrode tabs 1242.

[0255] In the third direction Z, the positive electrode tab 1241 and the negative electrode tab 1242 can be located at the same end of the electrode assembly 12, or they can be located at opposite ends of the electrode assembly 12.

[0256] As an example, the pouch cell 10 includes a plurality of electrode terminals 13, each of which includes a positive terminal 131 and a negative terminal 132. The positive terminal 131 is connected to the positive electrode tab 1241, and the negative terminal 132 is connected to the negative electrode tab 1242.

[0257] Electrode terminals 13 can pass between the two first encapsulation edges 11111 of the first encapsulation portion to extend from the inside of the packaging bag 11 to the outside of the packaging bag 11. Optionally, the positive terminal passes between the two first encapsulation edges 11111 of one first encapsulation portion, and the negative terminal passes between the two first encapsulation edges 11111 of the other first encapsulation portion.

[0258] As an example, electrode terminal 13 and electrode tab 124 can be connected by laser welding.

[0259] As an example, the first insulating element 14 may wrap around the electrode terminal 13 to separate the electrode terminal 13 from the first encapsulation edge 11111, thereby reducing the risk of short circuit.

[0260] As an example, the first insulating element 14 is sealed to the two first encapsulation edges 11111 by heat fusion.

[0261] In some embodiments, the electrode terminal 13 and the tab portion 124 are stacked along the first direction X.

[0262] In some embodiments, the electrode terminal 13 has a sheet-like structure. As an example, the thickness direction of the electrode terminal 13 is parallel to the first direction X.

[0263] In some embodiments, refer to Figure 13The packaging bag 11 includes a packaging body 15 and an encapsulation portion 16 disposed along the outer periphery of the packaging body 15. The electrode assembly 12 is housed within the packaging body 15. The encapsulation portion 16 includes a first encapsulation portion 161 and a second encapsulation portion 162. The first encapsulation portion 161 is disposed on at least one side of the packaging body 15 along a third direction Z, and the second encapsulation portion 162 is disposed on the side of the packaging body 15 away from the support plate 21 along a second direction Y. The second encapsulation portion 162 includes a portion of a third surface 10c. A second thermally conductive adhesive 50 covers at least a portion of the second encapsulation portion 162.

[0264] The packaging body 15 has an internal cavity, in which the electrode assembly 12 is housed.

[0265] As an example, the packaging body 15 includes a bottom wall 1112 and a peripheral wall 1113.

[0266] As an example, the first encapsulation portion 161 includes a first encapsulation edge 11111 of a packaging film 111 and a first encapsulation edge 11111 of another packaging film 111, and the two first encapsulation edges 11111 of the first encapsulation portion 161 are at least partially fused together.

[0267] Optionally, the packaging section 16 includes two first packaging sections 161, which are respectively disposed on both sides of the packaging body 15 along the third direction Z.

[0268] As an example, the second encapsulation portion 162 includes a second encapsulation edge 11112 of a packaging film 111 and a second encapsulation edge 11112 of another packaging film 111, the two second encapsulation edges 11112 of the second encapsulation portion being at least partially fused together.

[0269] Optionally, the packaging section 16 includes a second packaging section 162.

[0270] The second encapsulation portion 162 includes a portion of the third surface 10c, and the packaging body 15 includes another portion of the third surface 10c. As an example, the peripheral wall 1113 of the packaging body 15 includes another portion of the third surface 10c.

[0271] The second thermally conductive adhesive 50 covers at least a portion of the second encapsulation portion 162, which can improve the sealing effect of the second encapsulation portion 162 and reduce the risk of sealing failure of the second encapsulation portion 162.

[0272] In some embodiments, the packaging body 15 does not have a sealing portion 16 on the side facing the support plate 21 along the second direction Y, which helps to reduce the sealing edge and improve the sealing effect. The second surface 10b can be entirely located on the packaging body 15, which helps to improve the stability and reliability of the bonding between the first thermally conductive adhesive 40 and the soft-pack battery cell 10.

[0273] As an example, the packaging bag 11 includes two integrally formed packaging films 111, which can be formed by folding an aluminum-plastic film. The side of the packaging body 15 facing the support plate 21 along the second direction Y is the folded edge of the aluminum-plastic film.

[0274] In some embodiments, refer to Figure 16 The packaging bag 11 includes a stacked encapsulation layer 11a, a metal layer 11b, and a protective layer 11c. The encapsulation layer 11a is located on the surface of the metal layer 11b facing the electrode assembly 12, and the encapsulation layer 11a is fused to the first insulating member 14.

[0275] A portion of the encapsulation layer 11a and a portion of the first insulating element 14 are fused together and bonded to each other.

[0276] As an example, metal layer 11b can be an aluminum layer or a steel layer.

[0277] As an example, each packaging film 111 includes an encapsulation layer 11a, a metal layer 11b, and a protective layer 11c. The encapsulation layers 11a of two packaging films 111 are fused together to form a welded section.

[0278] The first insulating element 14 is fused to the encapsulation layer 11a of the two packaging films 111.

[0279] By designing a multi-layered structure, the strength and weight of the packaging bag 11 can be balanced, thereby increasing the energy density of the pouch battery cell 10. The metal layer 11b can reduce the penetration of water and oxygen into the interior of the packaging bag 11, reduce the decomposition of the electrolyte and the oxidation of the electrode materials, and thus improve the lifespan of the pouch battery cell 10.

[0280] In some embodiments, the material of the encapsulation layer 11a includes polypropylene. Optionally, the encapsulation layer 11a includes a polypropylene (PP) layer and a modified polypropylene (PPa) layer disposed between the polypropylene (PP) layer and the metal layer 11b.

[0281] Modified polypropylene refers to functionalized materials that optimize the properties of ordinary polypropylene (PP) through chemical or physical means, including but not limited to grafting maleic anhydride onto the polypropylene molecular chain, introducing ethylene monomers to copolymerize with propylene, blending polypropylene with polyolefin elastomers or EPDM rubber, and adding nano-inorganic particles (such as nano-silica). Different modification methods are beneficial for specifically improving the heat-sealing properties, chemical resistance, adhesion and mechanical strength of the material.

[0282] Modified polypropylene further improves the electrolyte corrosion resistance and bonding strength of the packaging bag 11, and the encapsulation layer 11a helps to reduce interface leakage caused by insufficient heat seal strength.

[0283] In some embodiments, the modified polypropylene (PPa) layer comprises maleic anhydride-grafted polypropylene.

[0284] The carboxyl group (-COOH) and anhydride group (-CO-O-CO-) of maleic anhydride can chemically bond with the hydroxyl group (-OH) or aluminum oxide (Al2O3) on the surface of aluminum foil, and at the same time maintain molecular chain entanglement with the polypropylene matrix. This is beneficial to further improve the peel strength between the encapsulation layer 11a and the metal layer 11b, reduce the probability of delamination between the encapsulation layer 11a and the metal layer 11b, reduce the risk of encapsulation failure of the soft-pack battery cell 10, and further improve the reliability of the soft-pack battery cell 10.

[0285] In some embodiments, the material of the protective layer 11c includes one or more of nylon and polyethylene terephthalate. The protective layer 11c has excellent mechanical properties, which can buffer mechanical impacts during assembly, thereby reducing the risk of encapsulation failure of the pouch cell 10 and improving the reliability of the battery device 2.

[0286] In some embodiments, the packaging bag 11 is heat-sealed at 180°C-220°C.

[0287] The heat sealing temperature of the packaging bag 11 is within the above range, which helps to enhance the interfacial bonding strength, reduce the probability of delamination between the encapsulation layer 11a and the metal layer 11b during the cycle of the soft-pack battery cell 10, reduce the risk of encapsulation failure of the soft-pack battery cell 10, and improve the reliability of the soft-pack battery cell 10.

[0288] Optionally, the packaging bag 11 is heat-sealed at 200℃-210℃.

[0289] In some embodiments, refer to Figure 6 The soft-pack battery cell 10 includes a packaging bag 11 and an electrode assembly 12 contained within the packaging bag 11. The electrode assembly 12 includes a positive electrode film 1212, which includes a positive electrode active material, which includes a lithium-containing transition metal phosphate.

[0290] Lithium-containing transition metal phosphates refer to phosphate materials containing lithium and transition metal elements, and can be detected by any method known in the art. For example, they can be detected by combining X-ray diffraction (XRD) with energy dispersive spectroscopy (EDS) or inductively coupled plasma mass spectrometry (ICP-MS).

[0291] Lithium-containing transition metal phosphates, as positive electrode active materials, have advantages such as high safety, long cycle life, low cost, and high high temperature stability.

[0292] In some embodiments, the pouch cell 10 is a lithium iron phosphate battery.

[0293] In some embodiments, the positive electrode film 1212 includes a conductive agent, which includes carbon nanotubes, and the carbon nanotubes include one or more of single-walled carbon nanotubes, few-walled carbon nanotubes, and multi-walled carbon nanotubes.

[0294] The term "carbon nanotubes" refers to nanotubes composed of carbon atoms arranged in sp... 2 Graphene sheets, formed by hybrid bonding, are rolled up to form nanomaterials with several to dozens of coaxial hollow cylindrical layers. Their diameters typically range from several to tens of nanometers, while their lengths can vary from micrometers to centimeters, exhibiting a high aspect ratio. Based on the number of layers, graphene sheets can be classified into: single-walled carbon nanotubes (SWCNTs), few-walled carbon nanotubes (FWCNTs), and multi-walled carbon nanotubes (MWCNTs). Carbon nanotubes possess excellent electrical conductivity and high elastic modulus.

[0295] Carbon nanotubes have a high aspect ratio, which facilitates the bonding of multiple lithium transition metal phosphate particles in the thickness direction of the positive electrode film 1212. This forms a long-range conductive path and increases the binding force between particles, reducing local polarization and even lithium plating problems in the pouch cell 10 during cycling, thus improving the cycle life of the pouch cell 10. Through the binding effect, carbon nanotubes can also reduce the rebound phenomenon of large particles in the positive electrode film 1212, further reducing the probability of contact and short circuit between the negative electrode film 1222 and the positive electrode film 1212, reducing the amount of gas generated by the electrolyte due to high-temperature decomposition, improving the cycle performance of the pouch cell 10, and giving the pouch cell 10 and battery device 2 good reliability.

[0296] In some embodiments, the carbon nanotubes in the positive electrode film 1212 account for 0.3%-0.7% of the total mass.

[0297] As an example, the mass percentage of carbon nanotubes in the positive electrode film 1212 is 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, or any value between two of the above.

[0298] In this embodiment, setting the mass percentage of carbon nanotubes in the positive electrode film layer 1212 to be greater than or equal to 0.3% can improve the cycle performance of the pouch cell 10. Setting the mass percentage of carbon nanotubes in the positive electrode film layer 1212 to be less than or equal to 0.7% helps reduce the risk of excessive carbon nanotube aggregation, ensuring uniform distribution of carbon nanotubes in the positive electrode film layer 1212 and improving the cycle performance of the pouch cell 10.

[0299] In some embodiments, the conductive agent further includes conductive carbon black. The conductive carbon black has a small size, adheres to the surface of lithium transition metal phosphate particles, and fills the gaps between the lithium transition metal phosphate particles, forming dense dot-like conductive contacts. Its use in conjunction with carbon nanotubes balances long-range and short-range conductivity, which is beneficial for further improving the conductive network in the positive electrode film 1212. Simultaneously, the conductive agent has a large specific surface area, which is beneficial for liquid absorption and retention, reducing electrolyte extrusion caused by the high expansion force increase of the electrode during long cycles, and improving the long cycle life of the pouch cell 10.

[0300] In some embodiments, the pouch cell 10 includes a packaging bag 11, an electrode assembly 12 contained within the packaging bag 11, and an electrolyte contained within the packaging bag 11. The electrolyte includes dimethyl carbonate, which helps to reduce the viscosity of the electrolyte, enhance ionic conductivity, optimize the low-temperature performance of the pouch cell 10, and improve the rate performance of the pouch cell 10.

[0301] In some embodiments, the mass percentage of dimethyl carbonate in the electrolyte is 10% to 32%. As an example, the mass percentage of dimethyl carbonate in the electrolyte is 10%, 12%, 14%, 15%, 16%, 18%, 5%, 20%, 22%, 24%, 25%, 26%, 28%, 30%, 32%, or any two of the above values.

[0302] In this embodiment, the mass percentage of dimethyl carbonate in the electrolyte is set to be greater than or equal to 10%, which helps to reduce the viscosity of the electrolyte system, improve the ionic conductivity of the electrolyte, reduce the internal resistance of the pouch cell 10, improve the dynamic performance of the pouch cell, facilitate fast charging of the battery device 2, and improve the cycle life of the battery device and the pouch cell; it can also reduce the internal resistance of the pouch cell 10 and reduce the heat generation of the pouch cell 10.

[0303] In some embodiments, refer to Figure 5 , Figure 6 , Figure 17 and Figure 18 The soft-pack battery cell 10 includes a packaging bag 11 and an electrode assembly 12 housed within the packaging bag 11. The electrode assembly 12 includes at least one positive electrode 121, at least one negative electrode 122, and a separator 123, with the separator 123 disposed between the positive electrode 121 and the negative electrode 122. The separator 123 includes a base film 1231, an inorganic particle layer 1232, and an adhesive layer 1233. The inorganic particle layer 1232 is provided on at least one side of the base film 1231, and the adhesive layer 1233 is provided on the side of at least one inorganic particle layer 1232 away from the base film 1231. The adhesive layer 1233 is a continuous layer with a porous structure and includes a vinylidene fluoride polymer.

[0304] In some examples, the base film 1231 has an inorganic particle layer 1232 on only one side, and an adhesive layer 1233 is provided on the side of the inorganic particle layer 1232 away from the base film 1231.

[0305] In other examples, inorganic particle layers 1232 are provided on both sides of the base film 1231. The inorganic particle layers 1232 located on both sides of the base film 1231 are a first inorganic particle layer and a second inorganic particle layer, respectively. An adhesive layer 1233 is provided on the side of the first inorganic particle layer away from the base film 1231, and the surface of the second inorganic particle layer away from the base film 1231 may or may not have an adhesive layer 1233.

[0306] The adhesive layer 1233 has a certain porous structure in its continuous structure. Through the porous structure, the inorganic particle layer 1232 disposed between the base film 1231 and the adhesive layer 1233 can be observed. It is understood that when a porous continuous layer is used as the adhesive layer 1233, it may become blocky due to contact with the positive electrode 121 or the negative electrode 122 or under pressure during electrode manufacturing or cycling. The continuous layer referred to in this application does not require that the adhesive layer 1233 be continuous throughout the entire pouch cell 10; rather, it refers to a continuous layer with a uniform porous structure at the microscopic level, such as when observed under a microscope, rather than an island-like structure. To reflect the true morphology of the separator 123, during the sampling process, it is preferable to sample in areas where the adhesive layer 1233 of the separator 123 in the pouch cell 10 has minimal adhesion to the positive electrode 121 or negative electrode 122. For example, sampling can be performed on the separator 123 at a location extending beyond the positive electrode film 1212 and the negative electrode film 1222 in the third direction Z; or sampling can be performed on the separator 123 near the outer surface of the electrode assembly 12. The separator 123 sampled in this way better reflects the true state of the separator 123.

[0307] The inorganic particle layer 1232 can improve the thermal stability of the separator 123, reduce the shrinkage of the base film 1231 at high temperatures, and reduce the risk of thermal runaway of the pouch cell 10. The inorganic particle layer 1232 can improve the tensile strength and puncture resistance of the separator 123. The inorganic particle layer 1232 can reduce the risk of short circuit and improve the reliability of the pouch cell 10. The separator 123 provided in this embodiment uses a porous continuous layer as the adhesive layer 1233. The adhesive layer 1233 has a larger adhesive area, which makes the adhesion between the separator 123 and the electrode more firm and uniform. At the same time, with the help of the porous structure in the adhesive layer 1233, it can achieve both lithium-ion transport efficiency and kinetic performance of the pouch cell 10.

[0308] In this embodiment, a continuous layer with a porous structure is used as the adhesive layer 1233. This improves the adhesion between the separator 123 and the electrode while maintaining the air permeability and porosity of the separator 123, thereby improving the stability of the electrode, increasing the density and rigidity of the electrode assembly 12, reducing the risk of misalignment of the positive and negative electrode sheets 122, and improving the cycle performance of the soft-pack battery cell 10.

[0309] In some embodiments, polyvinylidene fluoride (PVDF) is dissolved in N-methylpyrrolidone (NMP), stirred until homogeneous, and then polyethylene glycol (PEG) is added as a pore-forming agent and thoroughly mixed to obtain an adhesive layer solution. The adhesive layer solution is applied to the aforementioned base film with inorganic particulate layers on both sides, pre-evaporated at 80°C and dried at 110°C, and then immersed in deionized water to dissolve the PEG, resulting in a separator with an adhesive layer having a porous structure on both sides.

[0310] In some embodiments, the electrode assembly 12 has a stacked structure. The adhesive layer 1233 can increase the interfacial shear force between the electrode and the separator 123, thereby reducing the relative slippage between the positive and negative electrode 122 under long-term cycling or mechanical impact, reducing the risk of breakage, and improving reliability.

[0311] In some embodiments, the vinylidene fluoride polymer includes one or more of vinylidene fluoride homopolymers and copolymers of vinylidene fluoride and hexafluoropropylene.

[0312] As an example, adhesive layer 1233 includes polyvinylidene fluoride (PVDF).

[0313] In some embodiments, the material of the base film 1231 may include, but is not limited to, one or more of glass fiber, nonwoven fabric, polyethylene (PE), and polypropylene (PP).

[0314] In some embodiments, the inorganic particle layer 1232 includes ceramic particles, which include one or more of Al2O3, AlO(OH), SiO2, TiO2, MgO, CaO, ZnO2, ZrO2, and SnO2.

[0315] Ceramic particles are flame-retardant and have high hardness, making them resistant to deformation under heat and thus exhibiting excellent dimensional stability. The inorganic particle layer 1232 disposed on both sides of the base film 1231 helps to improve the rigidity of the pouch cell 10, reduces the probability of contact and short circuit between the negative electrode film layer 1222 and the positive electrode film layer 1212, thereby reducing the amount of gas generated by the electrolyte due to high-temperature decomposition and improving the reliability of the pouch cell 10.

[0316] In some embodiments, inorganic particle layers 1232 are provided on both sides of the base film 1231. An adhesive layer 1233 is provided on the surface of each inorganic particle layer 1232.

[0317] The adhesive layers 1233 located on both sides of the base film 1231 are respectively bonded to the positive electrode film layer 1212 and the negative electrode film layer 1222.

[0318] In some embodiments, refer to Figure 16 The size H0 of the soft-pack battery cell 10 in the first direction X is 14mm-22mm.

[0319] As an example, H0 can be selected as 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm or any value between any two of the above.

[0320] Setting H0 to greater than or equal to 14mm is beneficial to increasing the capacity of the soft-pack battery cell 10; setting H0 to less than or equal to 22mm can reduce the heat generation of the electrode assembly 12 and reduce the difficulty of heat dissipation of the electrode assembly 12.

[0321] In some embodiments, refer to Figure 4 The size W0 of the soft-pack battery cell 10 in the second direction Y is 100mm-150mm.

[0322] As an example, W0 can be selected as 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, or any value between two of the above. Optionally, W0 is equal to W3.

[0323] Setting W0 to greater than or equal to 100mm is beneficial to increasing the capacity of the pouch cell 10; setting W0 to less than or equal to 150mm is beneficial to reducing the height of the pouch cell 10, reducing the difficulty of electrolyte wetting, improving electrolyte wetting consistency, and enhancing the cycle performance of the pouch cell 10.

[0324] In some embodiments, refer to Figure 4 The dimension L0 of the pouch cell 10 in the third direction Z is 500mm-1250mm. As an example, L0 can be selected as 500mm, 510mm, 520mm, 530mm, 540mm, 550mm, 560mm, 570mm, 580mm, 590mm, 600mm, 610mm, 620mm, 630mm, 640mm, 650mm, 660mm, 670mm, 680mm, 690mm, 700mm, 710mm, 720mm, 750mm, 800mm, 850mm, 900mm, 950mm, 1000mm, 1050mm, 1100mm, 1150mm, 1200mm, 1250mm, or any value between two of the above.

[0325] It should be noted that L0 does not take into account the size of the positive and negative terminals, that is, the size L0 of the soft-pack battery cell 10 in the third direction Z is equal to the size of the packaging bag 11 in the third direction Z.

[0326] Setting L0 to greater than or equal to 500 mm is beneficial to increasing the capacity of the pouch cell 10; setting L0 to less than or equal to 1250 mm is beneficial to shortening the electron transport path, reducing the internal resistance of the pouch cell 10, thereby reducing the heat generation of the pouch cell 10; under fast charging conditions, this embodiment can reduce the phenomenon of uneven temperature rise and uneven current density of the electrode in the length direction, and improve the cycle performance of the pouch cell 10.

[0327] In some embodiments, the dimension L0 of the pouch cell 10 in the third direction Z is 500mm-650mm. The shorter length of the pouch cell 10 is beneficial for reducing internal resistance and internal heat generation.

[0328] In other embodiments, the dimension L0 of the pouch cell 10 in the third direction Z is 900mm-1250mm.

[0329] The pouch battery cell 10 is relatively long. Using a large-sized pouch battery cell 10 is beneficial for achieving module-free integration, reducing the number of battery cell components, significantly improving space utilization, reducing the number of structural components, and increasing the energy density of the battery device 2.

[0330] In some embodiments, L0 is 500mm-1250mm, W0 is 100mm-150mm, and H0 is 14mm-22mm. Having the dimensions of the pouch cell 10 within these ranges is beneficial for optimizing the arrangement of the pouch cell 10, improving space utilization, and increasing the energy density of the battery device 2.

[0331] In some embodiments, the electrode assembly 12 has a stacked structure. Using the electrode assembly 12 with a stacked structure can improve the energy density of the pouch cell 10.

[0332] As an example, the electrode assembly 12 includes a plurality of positive electrode plates 121 and a plurality of negative electrode plates 122, which are alternately stacked along a first direction X. Each positive electrode plate 121 has at least one positive tab, and each negative electrode plate 122 has at least one negative tab.

[0333] A second aspect of this application also provides an electrical device, which includes a battery device 2 provided in any embodiment of the first aspect. The battery device 2 is used to provide electrical energy. The electrical device uses the battery device 2 as a power source, and the electrical device can be any of the aforementioned devices or systems that utilize the battery device 2.

[0334] A third aspect of this application also provides an energy storage device, which includes a battery device 2 provided in any embodiment of the first aspect. The battery device 2 is used to provide electrical energy. The energy storage device uses the battery device 2 as a power source, and the energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0335] Reference Figures 3 to 18 This application provides a battery device 2, which includes a housing 20, a battery cell assembly 30, a first thermally conductive adhesive 40, a second thermally conductive adhesive 50, a plurality of thermally conductive components 60, and a reinforcing plate 80. The housing 20 includes a support plate 21 and a frame 22 surrounding the outer periphery of the support plate 21, with the support plate 21 fixedly connected to the frame 22. The battery cell assembly 30 is housed within the housing 20 and includes a plurality of pouch battery cells 10 stacked in a first direction X. Each pouch battery cell 10 has a rated capacity greater than or equal to 50 Ah and less than or equal to 300 Ah. The surface of the pouch battery cell 10 includes a first surface 10a, a second surface 10b, and a third surface 10c. The two first surfaces 10a are disposed opposite each other along the first direction X, and the second surface 10b and the third surface 10c are disposed opposite each other along the second direction Y. The area of ​​the first surface 10a is larger than the area of ​​the second surface 10b, and the area of ​​the first surface 10a is larger than the area of ​​the third surface 10c. The first direction X is perpendicular to the second direction Y. The support plate 21 and the second surfaces 10b of the multiple pouch battery cells 10 are arranged opposite each other along the second direction Y. The second surfaces 10b of each pouch battery cell 10 are bonded to the support plate 21 by the first thermally conductive adhesive 40. Multiple thermally conductive components 60 are housed in the housing 20 and are arranged along the first direction X. The reinforcing plate 80 is located on the side of the battery cell assembly 30 away from the support plate 21 along the second direction Y. The thermally conductive components 60 are bonded to the support plate 21 by the first thermally conductive adhesive 40 and to the reinforcing plate 80 by the second thermally conductive adhesive 50. The support plate 21 has a first heat exchange channel 212 for guiding the flow of the heat exchange medium, and the reinforcing plate 80 has a second heat exchange channel 81 for guiding the flow of the heat exchange medium. The third surface 10c of each pouch cell 10 is bonded to the thermally conductive component 60 by the second thermally conductive adhesive 50.

[0336] The heat-conducting component 60 includes a first heat-conducting part 61 and two second heat-conducting parts 62, which are arranged along a first direction X. The first heat-conducting part 61 connects to the two second heat-conducting parts 62, and the two ends of the second heat-conducting parts 62 along a second direction Y are respectively connected to the first heat-conducting part 61 and the support plate 21. At least one soft-pack battery cell 10 is disposed between the two second heat-conducting parts 62 of the heat-conducting component 60. At least one soft-pack battery cell 10 is disposed between two adjacent heat-conducting components 60.

[0337] The thermal conductivity of the first thermally conductive adhesive 40 is 0.05 W / (m·K) to 2 W / (m·K). The thermal conductivity of the second thermally conductive adhesive 50 is 0.05 W / (m·K) to 2 W / (m·K). The shear strength of the second thermally conductive adhesive 50 is greater than or equal to 7 MPa, and the tensile strength of the second thermally conductive adhesive 50 is greater than or equal to 7 MPa.

[0338] The bonding area between the first thermally conductive adhesive 40 and the second surface 10b is 0.3-1 times the area of ​​the second surface 10b. The bonding area between the third surface 10c and the second thermally conductive adhesive 50 is 0.3-1 times the area of ​​the third surface 10c.

[0339] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0340] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery device, characterized in that, include: The housing includes a support plate and a frame surrounding the outer periphery of the support plate, wherein the support plate is fixedly connected to the frame; A battery cell assembly is housed within the housing. The battery cell assembly includes a plurality of pouch battery cells stacked in a first direction. Each pouch battery cell has a rated capacity greater than or equal to 50 Ah and less than or equal to 300 Ah. The surface of each pouch battery cell includes a first surface, a second surface, and a third surface. The two first surfaces are arranged opposite each other along the first direction, and the second and third surfaces are arranged opposite each other along a second direction. The area of ​​the first surface is greater than the area of ​​the second surface, and the area of ​​the first surface is greater than the area of ​​the third surface. The first direction is perpendicular to the second direction. A support plate is arranged opposite to the second surface of the plurality of pouch battery cells along the second direction. The second surface of each of the soft-pack battery cells is bonded to the support plate by the first thermally conductive adhesive. Multiple heat-conducting components are housed within the housing, and the multiple heat-conducting components are arranged along the first direction. At least a portion of each heat-conducting component is located between adjacent soft-pack battery cells along the first direction, and the heat-conducting component is connected to the support plate. The third surface of each of the soft-pack battery cells is bonded to the thermally conductive component by the second thermally conductive adhesive. The bonding area between the first thermally conductive adhesive and the second surface is 0.3-1 times the area of ​​the second surface; and / or, The bonding area between the third surface and the second thermally conductive adhesive is 0.3-1 times the area of ​​the third surface.

2. The battery device according to claim 1, characterized in that, The thermally conductive component is bonded to the support plate using the first thermally conductive adhesive.

3. The battery device according to claim 1 or 2, characterized in that, The thermal conductivity of the first thermally conductive adhesive is 0.05 W / (m·K) - 2 W / (m·K); and / or, The thermal conductivity of the second thermally conductive adhesive is 0.05 W / (m·K) - 2 W / (m·K).

4. The battery device according to claim 1, characterized in that, The minimum thickness of the first thermally conductive adhesive is 0.4mm-4mm; and / or The minimum thickness of the second thermally conductive adhesive is 0.4mm-4mm.

5. The battery device according to claim 4, characterized in that, The minimum thickness of the first thermally conductive adhesive is greater than the minimum thickness of the second thermally conductive adhesive.

6. The battery device according to claim 1 or 2, characterized in that, The support plate includes a thermal management component, which is bonded to the first thermally conductive adhesive and used to manage the temperature of the pouch cell.

7. The battery device according to claim 6, characterized in that, The support plate has a first heat exchange channel inside, which is used to guide the flow of the heat exchange medium.

8. The battery device according to claim 1, characterized in that, The heat-conducting component includes a first heat-conducting part and at least two second heat-conducting parts. Each second heat-conducting part is arranged along the first direction. At least one soft-pack battery cell is provided between two adjacent second heat-conducting parts of the heat-conducting component. The first heat-conducting part connects to two adjacent second heat-conducting parts. The two ends of the second heat-conducting part along the second direction are respectively connected to the first heat-conducting part and the support plate. The soft-pack battery cell located between two adjacent second thermally conductive portions of the thermally conductive component is a first soft-pack battery cell, and the third surface of the first soft-pack battery cell is bonded to the first thermally conductive portion by the second thermally conductive adhesive.

9. The battery device according to claim 8, characterized in that, The first thermally conductive part and the two second thermally conductive parts surround to form a cavity, at least one second thermally conductive adhesive is contained in the cavity, and the second thermally conductive adhesive contained in the cavity is bonded to the third surface of the first soft-pack battery cell, the first thermally conductive part and the two second thermally conductive parts.

10. The battery device according to claim 8 or 9, characterized in that, At least one of the pouch cell is provided between two adjacent heat-conducting elements in the first direction; The pouch cell located between the two heat-conducting components is a second pouch cell, and the third surface of the second pouch cell is bonded to the second heat-conducting part of the heat-conducting component by the second thermally conductive adhesive.

11. The battery device according to claim 10, characterized in that, The second thermally conductive adhesive, which is bonded to the third surface of the second soft-pack battery cell, is also bonded to the first thermally conductive portion.

12. The battery device according to claim 8 or 9, characterized in that, Two soft-pack battery cells are disposed between the two second heat-conducting parts of the heat-conducting component; Two soft-pack battery cells are disposed between two adjacent heat-conducting components.

13. The battery device according to claim 8, characterized in that, The battery device further includes multiple heat insulation components, and the second heat-conducting portions of the multiple heat insulation components and the multiple heat-conducting components are arranged alternately along the first direction, with the soft-pack battery cell disposed between the heat insulation components and the second heat-conducting portions; The thermal insulation component is bonded to the second thermally conductive adhesive.

14. The battery device according to claim 8, characterized in that, It also includes a reinforcing plate, which is located on the side of the battery cell assembly away from the support plate along the second direction. A second thermally conductive adhesive is provided between the first thermally conductive part and the reinforcing plate. The thermally conductive adhesive located between the first thermally conductive part and the reinforcing plate is bonded to the first thermally conductive part and the reinforcing plate.

15. The battery device according to claim 8, characterized in that, It also includes a reinforcing plate located on the side of the battery cell assembly away from the support plate along the second direction, and the reinforcing plate is bonded to the second thermally conductive adhesive.

16. The battery device according to claim 14 or 15, characterized in that, The reinforcing plate has a second heat exchange channel inside, which is used to guide the flow of the heat exchange medium.

17. The battery device according to claim 1, characterized in that, The soft-pack battery cell includes a packaging bag, an electrode assembly, an electrode terminal, and a first insulating member. The electrode assembly is housed within the packaging bag, and the electrode assembly has a tab at one end along a third direction. One end of the electrode terminal is located inside the packaging bag, and the other end is located outside the packaging bag. The electrode terminal is welded to the tab. The first insulating member surrounds the electrode terminal and is disposed between the electrode terminal and the packaging bag. The first insulating member is sealed to the packaging bag. The first direction, the second direction, and the third direction are perpendicular to each other.

18. The battery device according to claim 17, characterized in that, The packaging bag includes a packaging body and a sealing portion disposed along the outer periphery of the packaging body. The electrode assembly is housed within the packaging body. The sealing portion includes a first sealing portion and a second sealing portion. The first sealing portion is disposed on at least one side of the packaging body along the third direction, and the second sealing portion is disposed on the side of the packaging body away from the support plate along the second direction. The second encapsulation portion includes a portion of the third surface; The second thermally conductive adhesive covers at least a portion of the second encapsulation portion.

19. The battery device according to claim 18, characterized in that, The packaging body does not have the encapsulation part on the side facing the support plate along the second direction.

20. The battery device according to claim 18 or 19, characterized in that, The packaging bag includes a stacked encapsulation layer, a metal layer, and a protective layer. The encapsulation layer is located on the surface of the metal layer facing the electrode assembly, and the encapsulation layer is fused to the first insulating member.

21. The battery device according to claim 20, characterized in that, The encapsulation layer is made of polypropylene, and the protective layer is made of one or more of nylon and polyethylene terephthalate.

22. The battery device according to claim 1 or 17, characterized in that, The pouch battery cell includes a packaging bag and an electrode assembly contained within the packaging bag. The electrode assembly includes a positive electrode film layer, which includes a positive electrode active material, and the positive electrode active material includes a lithium transition metal phosphate.

23. The battery device according to claim 22, characterized in that, The positive electrode film layer includes a conductive agent, which includes carbon nanotubes, and the carbon nanotubes include one or more of single-walled carbon nanotubes, few-walled carbon nanotubes, and multi-walled carbon nanotubes.

24. The battery device according to claim 1 or 17, characterized in that, The pouch battery cell includes a packaging bag, an electrode assembly contained within the packaging bag, and an electrolyte contained within the packaging bag, wherein the electrolyte includes dimethyl carbonate.

25. The battery device according to claim 1 or 17, characterized in that, The soft-pack battery cell includes a packaging bag and an electrode assembly housed within the packaging bag. The electrode assembly includes at least one positive electrode, at least one negative electrode, and a separator, with the separator disposed between the positive electrode and the negative electrode. The separator includes a base film, an inorganic particle layer, and an adhesive layer. The inorganic particle layer is provided on at least one side of the base film, and the adhesive layer is provided on at least one side of the inorganic particle layer away from the base film. The adhesive layer is a continuous layer with a porous structure and includes a vinylidene fluoride polymer.

26. The battery device according to claim 25, characterized in that, The vinylidene fluoride polymer includes one or more of vinylidene fluoride homopolymers and copolymers of vinylidene fluoride and hexafluoropropylene.

27. The battery device according to claim 1, characterized in that, The dimension W0 of the pouch battery cell in the second direction is 100mm-150mm; the dimension H0 of the pouch battery cell in the first direction is 14mm-22mm; the dimension L0 of the pouch battery cell in the third direction is 500mm-1250mm; and the first direction, the second direction, and the third direction are perpendicular to each other.

28. The battery device according to claim 1, characterized in that, The shear strength of the first thermally conductive adhesive is greater than or equal to 7 MPa, and the tensile strength of the first thermally conductive adhesive is greater than or equal to 7 MPa; and / or The second thermally conductive adhesive has a shear strength greater than or equal to 7 MPa and a tensile strength greater than or equal to 7 MPa.

29. The battery device according to claim 1 or 28, characterized in that, The first thermally conductive adhesive is made of polyurethane, and the second thermally conductive adhesive is also made of polyurethane.

30. An electrical device, characterized in that, The battery device includes any one of claims 1 to 29, the battery device being used to provide electrical energy.

31. An energy storage device, characterized in that, The battery device includes any one of claims 1 to 29, the battery device being used for storing electrical energy.

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