Battery device, power utilization device and energy storage device

Abstract

The embodiment of the invention provides a battery device, a power utilization device and an energy storage device. The battery device comprises a battery box body and at least one battery cell assembly. The battery box body comprises a cover body, a first wall and a plurality of side walls, the first wall and the cover body are oppositely arranged along a first direction, a first end of each side wall along the first direction is connected to the first wall, a second end of each side wall along the first direction is connected to the cover body, and the first wall, the cover body and the plurality of side walls are enclosed to form a closed accommodating cavity. The battery monomer assembly is accommodated in the accommodating cavity; the cover body comprises a cover body and at least one convex rib, and the at least one convex rib is connected to one side, facing the battery monomer assembly, of the cover body. An accommodating gap is formed among the convex rib, the battery monomer assembly and at least one side wall, a bonding layer is arranged in the accommodating gap, the bonding layer is used for bonding the convex rib and the side wall or bonding the convex rib and the battery monomer assembly, and the bonding layer is also used for sealing the accommodating gap. And the connection reliability and the sealing performance between the cover body and the side wall are improved.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery device, an electrical device, and an energy storage device. Background Art

[0002] With the promotion and popularization of the green development concept, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are also increasingly used in energy storage fields.

[0003] In the existing battery system, humans have increasingly higher requirements for the performance of battery devices. Among them, the energy density of battery devices is one of the indicators for measuring the performance of battery devices. Therefore, how to improve the energy density of battery devices is one of the research directions in the industry. Summary of the Invention

[0004] To solve the above technical problems, embodiments of the present application provide a battery device, an electrical device, and an energy storage device to improve the energy density of the battery device.

[0005] The embodiments of the present disclosure are implemented through the following technical solutions.

[0006] A first aspect of an embodiment of the present disclosure provides a battery device, including: A battery case, comprising a cover, a first wall, and a plurality of side walls, wherein the first wall and the cover are arranged opposite to each other along a first direction, a first end of each side wall along the first direction is connected to the first wall, and a second end of each side wall along the first direction is connected to the cover, wherein the first wall, the cover, and the plurality of side walls enclose a sealed accommodation cavity; At least one battery cell assembly, accommodated in the accommodation cavity; The cover comprises a cover body and at least one rib, wherein the at least one rib is connected to a side of the cover body facing the battery cell assembly. There is an accommodating gap between the rib, at least one battery cell assembly and at least one side wall. There is an adhesive layer in the accommodating gap. The adhesive layer is used to bond the rib to the side wall, or to bond the rib to the battery cell assembly. The adhesive layer is also used to seal the accommodating gap.

[0007] In the battery device provided by the embodiments of the present disclosure, since the cover, the first wall, and the plurality of side walls enclose a sealed accommodation cavity, a sealed space is formed within the battery case. The interior of the battery case can prevent interference from the external environment, providing a stable internal environment for the components (e.g., battery cells) located within the battery case. This reduces the probability of the components (e.g., battery cells) within the battery case being damaged or destroyed by the external environment, thereby improving the reliability of the battery device. The cover is configured to include a cover body and a rib. Since an accommodation gap is provided between the rib, at least one battery cell assembly, and at least one side wall, and an adhesive layer is provided in the accommodation gap, that is, an adhesive layer can be provided between the rib and the side wall, which helps to increase the bonding area between the cover and the side wall. This improves the connection reliability between the cover and the side wall while also improving the sealing performance between the cover and the side wall. In addition, since the cover body and multiple side walls are bonded together by an adhesive layer, compared with fastening connections through fasteners, the cover body and side walls provided in the embodiment of the present disclosure do not require additional flange surfaces for fastening connections, which is beneficial to reducing the structural dimensions of the battery box, thereby improving the space utilization of the battery box and thus improving the energy density of the battery device.

[0008] In some embodiments, the adhesive layer includes a first layer, and the first layer is located between the rib and at least one of the side walls.

[0009] That is, the adhesive layer is provided by arranging a first layer, the first layer is located in the accommodation gap between the rib and at least one side wall, and the rib and at least one side wall are bonded through the first layer.

[0010] In some embodiments, the adhesive layer includes a second layer, and the second layer is located between the rib and at least one of the battery cell assemblies.

[0011] That is, the bonding layer is formed by providing a second layer, the second layer is located in the accommodation gap between the rib and the at least one battery cell assembly, and the rib and the at least one battery cell assembly are bonded via the second layer.

[0012] In some embodiments, the first layer is connected to the second layer.

[0013] Since the first layer and the second layer are connected, it is beneficial to improve the integrity of the adhesive layer, thereby increasing the bonding area between the cover body and the side wall and the battery cell assembly. While improving the connection reliability between the cover body and the side wall and the battery cell assembly, it also improves the sealing performance between the cover body and the side wall and the battery cell assembly.

[0014] In some embodiments, the first layer is spaced apart from the second layer.

[0015] Since the first layer and the second layer are spaced apart, the use of the adhesive layer is reduced, the cost is reduced, and the arrangement of the first layer and the second layer is facilitated.

[0016] In some embodiments, the battery cell assembly includes a plurality of battery cells arranged along a second direction, the battery cells including a housing, the housing defining a housing space through connected housing walls, a large housing wall among the housing walls being perpendicular to the second direction, wherein the large housing wall is the housing wall with the largest area among the housing walls. The plurality of side walls include a first side wall and a second side wall arranged opposite to each other along the second direction, and a third side wall and a fourth side wall arranged opposite to each other along a third direction, wherein the first direction, the second direction, and the third direction intersect each other. The battery box includes a bottom plate, a first end plate, a second end plate, a first side plate and a second side plate, wherein the bottom plate constitutes the first wall, the first end plate and the second end plate constitute the first side wall and the second side wall respectively, and the first side plate and the second side plate constitute the third side wall and the fourth side wall respectively. The at least one battery cell assembly is supported on the bottom plate, and the first end plate, the second end plate, the first side plate, and the second side plate are all in contact with at least one battery cell.

[0017] In this embodiment, the cover, the bottom plate, the first end plate, the second end plate, the first side plate, and the second side plate are collectively formed into a battery case, and the battery cell assembly is directly placed in the battery case collectively formed by the first end plate, the second end plate, the first side plate, and the second side plate, thereby forming a simple battery device with a simple structure, easy manufacturing, and low production cost. Moreover, the first end plate, the second end plate, the first side plate, and the second side plate are all in contact with at least one battery cell assembly. Therefore, the gap in the battery case can be reduced, the space utilization of the battery case can be improved, and the energy density of the battery device can be improved.

[0018] In some embodiments, the convex rib includes a first convex rib and a second convex rib, the accommodating gap includes a first gap and a second gap, the first convex rib and the first side plate have the first gap, and the second convex rib and the second side plate have the second gap.

[0019] By setting the first convex rib and the second convex rib, a first gap is defined between the first convex rib and the first side panel, and a second gap is defined between the second convex rib and the second side panel. During assembly, the bottoms of the first convex rib and the second convex rib fit into the top surface of the battery cell assembly, and the adhesive is squeezed into the first gap between the first convex rib and the first side panel and the second gap between the second convex rib and the second side panel, which is beneficial to increasing the bonding area between the cover body and the first side panel and the second side panel, and at the same time improving the connection reliability between the cover body and the first side panel and the second side panel, it also improves the sealing performance between the cover body and the first side panel and the second side panel.

[0020] In some embodiments, the cover body further includes at least one shielding flange connected to the cover body, a portion of the shielding flange shields the accommodating gap along the first direction, and another portion is folded on the side of the side wall away from the accommodating cavity.

[0021] The shielding flange can shield the connection between the cover body and the end face of the side wall and the side of the side wall, which can reduce the possibility of dripping or condensed water entering the accommodation gap through the gap between the cover body and the end face of the side wall, and reduce the possibility of dripping or condensed water gathering at the glue coating interface, thereby reducing the possibility of dripping or condensed water entering the accommodation cavity.

[0022] In some embodiments, the convex rib includes a first convex rib and a second convex rib, the accommodating gap includes a first gap and a second gap, the first convex rib and the first side plate have the first gap, the second convex rib and the second side plate have the second gap, and the shielding flange includes a first shielding flange and a second shielding flange. A portion of the first shielding flange blocks the first gap along the first direction, and another portion is folded and located on a side of the first side panel facing away from the accommodating cavity along the third direction. The first shielding flange and the first rib form a first slot, and a portion of the first side panel is inserted into the first slot. A portion of the second shielding flange blocks the second gap along the first direction, and another portion is folded and located on the side of the second side panel away from the accommodating cavity along the third direction. The second shielding flange and the second rib form a second slot, and a portion of the second side panel is inserted into the second slot.

[0023] Since the first shielding flange and the first rib form a first slot, a portion of the first side panel is inserted into the first slot, and the second shielding flange and the second rib form a second slot, a portion of the second side panel is inserted into the second slot, which can play a positioning role between the cover body and the first side panel and the second side panel, and is beneficial to improving the assembly efficiency and assembly accuracy of the battery box.

[0024] In some embodiments, the cover is bonded to end surfaces of the first end plate and the second end plate close to the cover.

[0025] By bonding the cover to the end surfaces of the first and second end plates near the cover, the connection structure is simple and reduces the use of fasteners, thereby reducing costs. Because the first and second end plates are thick plate structures with a certain thickness, the connection strength between the cover and the first and / or second end plates is further improved.

[0026] In some embodiments, at least one of the first end plate and the second end plate is configured to have a glue overflow groove formed on an end surface close to the cover body along the first direction.

[0027] In this embodiment, by configuring at least one of the first end plate and the second end plate to have a glue overflow groove formed on the end surface close to the cover body side along the first direction, not only can the connection strength between the cover body and the first end plate and / or the second end plate be enhanced, thereby enhancing the stability of the overall structure of the battery box, but also the cover body and the first end plate and / or the second end plate can be sealed, thereby improving the sealing performance of the battery box.

[0028] In some embodiments, at least one of the first side panel and the second side panel is configured to have a side panel main body and a side panel flange portion, the side panel main body is configured to be a plate extending along the first direction, the side panel flange portion is connected to one end of the side panel main body along the first direction, and the side panel flange portion is located on a side of the bottom plate away from the cover body along the first direction and is connected to the bottom plate.

[0029] Because the side panel flange is located on the side of the bottom panel facing away from the cover along the first direction and is connected to the bottom panel, the side panel flange can provide support for the bottom panel, thereby improving the load-bearing capacity of the bottom panel. Furthermore, at least one of the first and second side panels is configured to include a side panel body and a side panel flange. During assembly of the first and / or second side panels with other walls of the battery case, the first and / or second side panels can abut against the bottom panel to secure their relative positions, thereby reducing the difficulty of assembling the battery case.

[0030] In some embodiments, the base plate has the medium flow channel built into it.

[0031] Because at least one of the first and second walls includes a heat exchange medium flow channel, the heat exchange medium in the heat exchange medium flow channel can remove heat generated by the battery cell assemblies, reducing the temperature of the battery cell assemblies, lowering the probability of thermal runaway of the battery cell assemblies, and thus reducing the probability of thermal runaway of the battery device. Furthermore, no additional heat exchange components are required to exchange heat from the battery cell assemblies, which helps improve the compactness and energy density of the battery device while reducing manufacturing costs.

[0032] In some embodiments, the first end plate and the second end plate are both connected to the base plate, and along the first direction, the end faces of the first end plate and the second end plate respectively abut against the surface of the base plate facing the cover body along the first direction.

[0033] Since the relative positions of the first end plate, the second end plate and the bottom plate are fixed, the difficulty of assembling the battery box is reduced.

[0034] In some embodiments, at least one of the first side plate and the second side plate is configured to include a side plate main body and an insulating layer, the side plate main body is configured to be a plate extending along the first direction, the insulating layer is arranged between the side plate main body and the battery cell assembly, and the insulating layer is in contact with at least one of the battery cells.

[0035] By constructing at least one of the first side plate and the second side plate to include a side plate main body and an insulating layer, and contacting at least one battery cell through the insulating layer, it is beneficial to improve the insulation performance between the box assembly and the battery cell, thereby improving the reliability of the battery device.

[0036] In some embodiments, the battery device further includes at least one restraining member, the at least one restraining member being used to restrain the battery box, and the at least one restraining member being located outside the accommodating cavity.

[0037] Since the restraints restrain the battery case, the restraints can strengthen the strength of the battery case. Moreover, when the battery cell assembly expands due to heat and squeezes the battery case, the restraints can exert a restraining force on the battery case, reducing the probability of the battery cell assembly releasing gas due to thermal runaway, which leads to an increase in gas in the battery case and partial bulging or even damage of the battery case, thereby enhancing the strength of the battery case. It can also reduce the probability or degree of deformation of the battery case, improve the outer contour dimensional accuracy of the battery device, and improve the appearance of the battery device. Moreover, during the inflation test stage in the assembly production process of the battery device, the step of pressing the battery case to prevent the battery case from bulging and deformation can be eliminated, thereby improving production efficiency. Moreover, the restraints are located outside the accommodating cavity, which can save space in the battery case and improve the energy density of the battery device.

[0038] In some embodiments, the at least one restraining member includes at least one first restraining member, and along the first direction, relative to the battery cell assembly, the first restraining member is located on the side where the cover is located, and / or, The at least one restraining member includes at least one second restraining member, and along the first direction, relative to the battery cell assembly, the second restraining member is located on the side where the first wall is located, The restraint member includes a restraint member main body and a restraint member connecting portion. The restraint member connecting portions are located at both ends of the restraint member main body and are both connected to the restraint member main body. The restraint member connecting portions are connected to the side wall.

[0039] Since the restraining member connecting portion is connected to the side wall, under the pulling of the restraining member, the side walls respectively connected to the restraining member connecting portion can clamp the battery cell assembly, reducing the probability of the battery cell assembly expanding due to charging and / or discharging or reducing the degree of expansion of the battery cell assembly due to charging and / or discharging.

[0040] In some embodiments, the main body of the restraint is configured in a strip shape and its length direction is consistent with the second direction, and the two restraint connection parts are respectively connected to the first side wall and the second side wall.

[0041] The large-surface shell wall in the battery cell is more likely to be deformed due to the charging and / or discharging of the battery cell. Since the large-surface shell wall is perpendicular to the second direction and the two restraining member connecting parts are respectively connected to the first side wall and the second side wall, the large-surface shell wall can have a larger clamping force along the second direction. As a result, the probability or degree of deformation of the large-surface shell wall caused by the increase in pressure inside the battery cell due to the charging and / or discharging of the battery cell can be reduced, thereby reducing the probability of deformation of the battery device or reducing the degree of deformation of the battery device.

[0042] A second aspect of the embodiments of the present disclosure provides an electrical device, which includes the battery device described above.

[0043] The battery device of the electrical device provided in the embodiment of the present disclosure has a sealed accommodation cavity formed by the cover, the first wall, and the plurality of side walls. Therefore, a sealed space is formed inside the battery case, which can prevent interference from the external environment and provide a stable internal environment for the components (e.g., battery cells) located inside the battery case. This reduces the probability of the components (e.g., battery cells) inside the battery case being damaged or destroyed by the external environment, thereby improving the reliability of the battery device. The cover is configured to include a cover body and a rib. Since there is an accommodation gap between the rib, at least one battery cell assembly, and at least one side wall, and an adhesive layer is provided in the accommodation gap, that is, an adhesive layer can be provided between the rib and the side wall, which is conducive to increasing the bonding area between the cover and the side wall. While improving the connection reliability between the cover and the side wall, it also improves the sealing performance between the cover and the side wall. In addition, since the cover body and multiple side walls are bonded together by an adhesive layer, compared with fastening connections through fasteners, the cover body and side walls provided in the embodiment of the present disclosure do not require additional flange surfaces for fastening connections, which is beneficial to reducing the structural dimensions of the battery box, thereby improving the space utilization of the battery box and thus improving the energy density of the battery device.

[0044] A third aspect of the embodiments of the present disclosure provides an energy storage device, which includes the battery device described above.

[0045] In the battery device of the energy storage device provided by the embodiments of the present disclosure, since the cover, the first wall, and the plurality of side walls enclose a sealed accommodation cavity, a sealed space can be formed inside the battery case. The interior of the battery case can prevent interference from the external environment, providing a stable internal environment for the components (e.g., battery cells) located inside the battery case. This reduces the probability of the components (e.g., battery cells) inside the battery case being damaged or destroyed by the external environment, thereby improving the reliability of the battery device. The cover is configured to include a cover body and a rib. Since a accommodating gap is provided between the rib, at least one battery cell assembly, and at least one side wall, and an adhesive layer is provided in the accommodating gap, that is, an adhesive layer can be provided between the rib and the side wall, which is beneficial for increasing the bonding area between the cover and the side wall. This improves the connection reliability between the cover and the side wall while also improving the sealing performance between the cover and the side wall. In addition, since the cover body and multiple side walls are bonded together by an adhesive layer, compared with fastening connections through fasteners, the cover body and side walls provided in the embodiment of the present disclosure do not require additional flange surfaces for fastening connections, which is beneficial to reducing the structural dimensions of the battery box, thereby improving the space utilization of the battery box and thus improving the energy density of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application; Figure 2 A schematic structural diagram of a battery device provided in some embodiments of the present application; Figure 3 for Figure 2 A perspective exploded schematic diagram of the battery device shown; Figure 4 for Figure 2 A1 area enlarged schematic diagram; Figure 5 A schematic diagram of the structure of a restraining member provided in some embodiments of the present application; Figure 6 A schematic structural diagram of a third side wall provided in some embodiments of the present application; Figure 7 A schematic structural diagram of a first side wall provided in some embodiments of the present application; Figure 8 for Figure 7 A magnified schematic diagram of the B1 area; Figure 9 A schematic structural diagram of a battery device provided in some other embodiments of the present application; Figure 10 for Figure 9 Schematic diagram of CC cross section; Figure 11 for Figure 10 Schematic diagram of the enlarged structure of the C1 region; Figure 12 for Figure 10 Schematic diagram of the enlarged structure of the C2 region; Figure 13 for Figure 9 DD cross-sectional diagram; Figure 14 for Figure 13 Schematic diagram of the enlarged structure of the D1 region; Figure 15 for Figure 13 Schematic diagram of the enlarged structure of the D2 region; Figure 16 A schematic exploded perspective view of a battery cell provided in some embodiments of the present application; Figure 17 This is a schematic diagram of the structure of a charging network in some embodiments of the present application; Figure 18 A schematic diagram of the structure of an energy storage system in some embodiments of the present application; Figure 19 Schematic diagram of the structure of the energy storage device in some embodiments of the present application.

[0047] Description of Reference Numerals 10. Battery cell assembly; 11. Battery cell; 111. Electrode terminal; 112. Housing; 1121. Large housing wall; 113. Pressure relief mechanism; 114. Electrode assembly; 115. Accommodation space; 20. Box assembly; 21. Cover; 211. Cover body; 212. Rib; 2121. First rib; 2122. Second rib; 213. Blocking flange; 2131. First blocking flange; 2132. Second blocking flange; 22. First wall; 23. Side wall; 231. First side wall; 2311. Step portion; 2312. Flange portion; 2313. First step surface; 2314. Rising surface; 2315. Second step surface; 2316. Glue overflow groove; 232. Second side wall ; 233, third side wall; 2331, side panel main body; 2332, side panel flange; 2333, insulating layer; 2334, raised portion; 234, fourth side wall; 24, accommodating gap; 241, first gap; 242, second gap; 25, adhesive layer; 251, first layer; 30, restraint; 31, first restraint; 32, second restraint; 33, restraint main body; 34, restraint connection; 100, battery device; 200, controller; 300, motor; 400, energy storage device; 410, energy storage box; 500, charging pile; 600, energy storage converter; 1000, vehicle; 3000, charging network; 4000, energy storage system; 5000, power generation device. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of this application, the technical terms "first," "second," "third," "fourth," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise explicitly and specifically defined.

[0051] Mention of "embodiment" in this document means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0052] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0055] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0056] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "projection" refers to the orthographic projection of parallel projection lines perpendicular to the projection surface.

[0057] Below, this application is described in detail.

[0058] With the promotion and popularization of the green development concept, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are also increasingly used in energy storage fields.

[0059] In the related art, a battery device includes a battery case and a battery cell assembly located within the case. The battery case includes a top cover and a case body. The top cover is provided with a flange surface of a certain width around the circumference of the top cover. The width of the flange surface includes the width required for bolt locking and sealing. The flange surface is provided with bolt mounting holes. The case body is also designed with a flange surface around the top cover that matches the flange surface of the top cover. The flange surface of the case body is provided with threaded holes corresponding to the mounting holes of the top cover. After the top cover is installed, the flange surface of the top cover vertically aligns with the flange surface of the case body and is locked together by bolts. A sealing gasket is designed inside the bolt mounting hole. The bolts press the top cover, which squeezes the sealing gasket to achieve a sealed connection between the top cover and the case body. The arrangement of the flange surface of the top cover and the flange surface of the case body results in a large space occupation and reduces the energy density of the battery device. In addition, the solution of achieving sealing through the sealing gasket requires the installation of dense bolts to ensure that the sealing gasket reaches the designed compression at all locations. This requires a large number of fasteners, resulting in high costs and low assembly efficiency. Because the upper cover flange is horizontal and the bolts are installed vertically, condensed water and other substances tend to accumulate on the top of the upper cover flange and at the bolt locations, causing these areas to be soaked in water for extended periods, potentially leading to corrosion or seal failure. Research has shown that the cover body can be bonded to the multiple side walls with an adhesive, saving space between the upper cover flange and the box flange, and increasing the energy density of the battery device. Furthermore, to improve the sealing performance between the cover body and the side walls, the cover body is configured to include a cover body and ribs, and the adhesive is squeezed between the ribs and the side walls. This improves both the connection reliability and the sealing performance between the cover body and the side walls.

[0060] Based on this design concept, an embodiment of the present application provides a battery device, which includes a battery case and at least one battery cell assembly. The battery case includes a cover, a first wall, and multiple side walls. The first wall and the cover are arranged opposite to each other along a first direction. The first end of each side wall along the first direction is connected to the first wall, and the second end of each side wall along the first direction is connected to the cover. The first wall, the cover, and the multiple side walls enclose a sealed accommodating cavity. At least one battery cell assembly is accommodated in the accommodating cavity. The cover includes a cover body and at least one rib, and the at least one rib is connected to a side of the cover body facing the battery cell assembly. An accommodating gap is provided between the rib, the at least one battery cell assembly, and the at least one side wall. An adhesive layer is provided in the accommodating gap. The adhesive layer is used to bond the rib to the side wall, or to bond the rib to the battery cell assembly. The adhesive layer is also used to seal the accommodating gap.

[0061] In the battery device provided by the embodiments of the present disclosure, since the cover, the first wall, and the plurality of side walls enclose a sealed accommodation cavity, a sealed space is formed within the battery case. The interior of the battery case can prevent interference from the external environment, providing a stable internal environment for the components (e.g., battery cells) located within the battery case. This reduces the probability of the components (e.g., battery cells) within the battery case being damaged or destroyed by the external environment, thereby improving the reliability of the battery device. The cover is configured to include a cover body and a rib. Since an accommodation gap is provided between the rib, at least one battery cell assembly, and at least one side wall, and an adhesive layer is provided in the accommodation gap, that is, an adhesive layer can be provided between the rib and the side wall, which helps to increase the bonding area between the cover and the side wall. This improves the connection reliability between the cover and the side wall while also improving the sealing performance between the cover and the side wall. In addition, since the cover body and multiple side walls are bonded together by an adhesive layer, compared with fastening connections through fasteners, the cover body and side walls provided in the embodiment of the present disclosure do not require additional flange surfaces for fastening connections, which is beneficial to reducing the structural dimensions of the battery box, thereby improving the space utilization of the battery box and thus improving the energy density of the battery device.

[0062] The battery device provided in the embodiments of the present application can be used in, but is not limited to, electrical devices such as vehicles, ships, or aircraft.

[0063] An embodiment of the present application further provides an energy storage device including the above-mentioned battery device. The energy storage device may include an energy storage container, an energy storage cabinet, etc.

[0064] The present application also provides an electrical device including the battery device described above. The electrical device may include, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0065] The battery device 100 is described below with reference to the accompanying drawings.

[0066] Please refer to Figure 17 and Figure 19 , Figure 17 This is a schematic diagram of the structure of the charging network provided in some embodiments of the present application. Figure 19 Schematic diagram of the structure of an energy storage device provided in some embodiments of the present application. Embodiments of the present application provide a charging network 3000, which includes charging piles 500, which are used to charge electrical devices. The charging network 3000 may also include an energy storage device 400, which is electrically connected to the charging piles 500 and is used to provide electrical energy to the charging piles 500.

[0067] It should be noted that the charging pile 500 is electrically connected to the battery cells in the energy storage device 400 via a cable, and the battery cells can provide their stored energy to the charging pile 500. The charging pile 500 has a connector that can be connected to an electrical device to replenish energy. The application of the energy storage device 400 in the charging network 3000 can effectively improve the safety of the charging network 3000 and also help increase the flexibility of the charging network 3000 during deployment.

[0068] In a charging network 3000 , there may be one charging pile 500 , and the energy storage device 400 provides power to the one charging pile 500 ; there may also be multiple charging piles 500 , and the energy storage device 400 provides power to multiple charging piles 500 .

[0069] As an example, Figure 17 As shown, the charging network 3000 includes an energy storage device 400 and two charging piles 500 , and one energy storage device 400 provides electrical energy to the two charging piles 500 .

[0070] The energy storage device 400 may include a battery device 100 , which is electrically connected to the charging pile 500 so that the battery device 100 provides electrical energy to the charging pile 500 .

[0071] Please refer to Figure 18 and Figure 19 , Figure 18Schematic diagram of the structure of the energy storage system provided in some embodiments of the present application. Embodiments of the present application provide an energy storage system 4000. The energy storage system 4000 includes an energy storage converter 600, which can be electrically connected to a power generation device 5000 to convert the electric power provided by the power generation device 5000. The energy storage system 4000 may also include an energy storage device 400, which is electrically connected to the energy storage converter 600. The energy storage converter 600 converts the electric energy provided by the power generation device 5000 into the energy storage device 400 for storage.

[0072] The power conversion device is used to connect between the power generation device 5000 and the energy storage device 400. The power generation device 5000 is used to generate electrical energy, and the power generation device 5000 is used to store the generated electrical energy in the energy storage device 400 through the power conversion device. The energy storage system 4000 uses the energy storage device 400 to effectively improve the operational safety of the energy storage system 4000. In a specific implementation, the power generation equipment can specifically be solar panels, hydroelectric power generation equipment, thermal power generation equipment, etc. The specific type of power generation equipment is not limited in this application.

[0073] As an example, Figure 18 As shown, the energy storage system 4000 includes an energy storage device 400 and an energy storage conversion device 600. The two power generation devices 5000 respectively transmit the generated electric energy to the energy storage conversion device 600, and the electric energy is introduced into the energy storage device 400 for storage through the energy storage conversion device 600.

[0074] Please refer to Figure 19 The energy storage device 400 includes an energy storage box 410 , in which the battery device 100 is disposed.

[0075] As an example, the energy storage device 400 may be an energy storage container, an energy storage cabinet, etc.

[0076] As an example, the energy storage device 400 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 power station can store electric energy during low power consumption periods and provide electric energy to relevant users or electrical equipment during peak power consumption periods. The wind energy collected by the wind turbines of the wind power generation system is converted into electric energy and then stored by the energy storage device 400. The solar power generation system can convert solar energy into electric energy, which is then stored by the energy storage device 400 and supplied to users in due time. The mobile power system can supply power to relevant electrical equipment in places where the power grid cannot reach, such as remote mountainous areas, remote wilderness areas, etc. The temporary power supply system can provide power to users when there is insufficient power supply.

[0077] Figure 1 A schematic structural diagram of a vehicle provided for some embodiments of the present application.

[0078] A controller 200, a motor 300, and a battery device 100 may be provided inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be provided at the bottom, front, or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation, and operation of the vehicle 1000. In another embodiment of the present disclosure, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but may also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0079] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0080] Figure 2 This figure illustrates the structure of a battery device according to some embodiments of the present application. The battery device 100 described in the embodiments of the present application may include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 may include multiple battery cells 11, which are connected in series, parallel, or hybrid via a busbar.

[0081] In some embodiments, a battery cell assembly 10 is typically formed by arranging multiple battery cells 11. For example, the battery cell assembly 10 may be a battery module, which is a single module formed by arranging and securing multiple battery cells 11. For example, a battery module may be formed by bundling multiple battery cells 11 together using cable ties.

[0082] In some embodiments, the battery device 100 may be a battery pack, which includes a battery case and one or more battery cell assemblies 10 , wherein the battery cell assemblies 10 are housed in the battery case.

[0083] As an example, the battery cell assembly 10 may be a battery module, and the battery cell assembly 10 may be housed in a battery box by fixing the battery module in the battery box.

[0084] As an example, the battery cell assembly 10 may also be housed in a battery box by directly fixing the plurality of battery cells 11 to the box.

[0085] In the embodiment of the present application, the battery cell 11 may be a secondary battery. A secondary battery refers to a battery cell 11 that can be continuously used by activating active materials by charging after the battery cell 11 is discharged.

[0086] The battery cell 11 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiment of the present application.

[0087] A battery cell 11 typically includes an electrode assembly 114. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 11, active ions (e.g., lithium ions) are intercalated and released between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing the active ions to pass through.

[0088] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0089] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0090] In some embodiments, the electrode assembly 114 further includes a separator disposed between the positive electrode and the negative electrode.

[0091] In some embodiments, the separator is a separator. The present invention has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be used.

[0092] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0093] In some embodiments, the battery cell 11 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present invention does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0094] In some embodiments, the electrode assembly 114 is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0095] In some embodiments, the electrode assembly 114 is a laminated structure.

[0096] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0097] As an example, multiple positive electrode sheets may be provided, and the negative electrode sheet is folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0098] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0099] As an example, multiple separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0100] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0101] In some embodiments, the electrode assembly 114 is provided with tabs that can conduct current from the electrode assembly 114. The tabs include a positive tab and a negative tab.

[0102] In some embodiments, the battery cell 11 may include a housing. The housing is used to encapsulate components such as the electrode assembly 114 and the electrolyte. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film.

[0103] As an example, the battery cell 11 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery cell. The polygonal battery cell is, for example, a hexagonal battery cell, etc. There is no special limitation in the embodiments of the present application.

[0104] In some embodiments, an electrode terminal 111 is provided on the shell, and the electrode terminal 111 partially passes through the shell and is electrically connected to the electrode assembly 114 through the tab.

[0105] In some specific embodiments, the electrode terminal 111 is made of a conductive metal material, such as copper or aluminum.

[0106] In some embodiments, a pressure relief mechanism 113 is provided on the housing to release the internal pressure of the battery cell 11 .

[0107] Below, refer to Figures 2 to 16 Some embodiments of the present application are described in detail.

[0108] In the description of the embodiments of this application, for ease of explanation, the direction indicated by arrow X represents the "first direction," the direction indicated by arrow Y represents the "second direction," and the direction indicated by arrow Z represents the "third direction." The first direction X, the second direction Y, and the third direction Z intersect with each other and are not coplanar. In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0109] See also Figures 2 to 16 The present disclosure provides a battery device 100, which includes a battery case and at least one battery cell assembly 10. The battery case includes a cover 21, a first wall 22, and a plurality of side walls 23. The first wall 22 and the cover 21 are arranged opposite each other along a first direction. The first end of each side wall 23 along the first direction is connected to the first wall 22, and the second end of each side wall 23 along the first direction is connected to the cover 21. The first wall 22, the cover 21, and the plurality of side walls 23 together form a sealed accommodating cavity. At least one battery cell assembly 10 is accommodated in the accommodating cavity. The cover 21 includes a cover body 211 and at least one rib 212. The at least one rib 212 is connected to a side of the cover body 211 facing the battery cell assembly 10. A accommodating gap 24 is defined between the rib 212, the at least one battery cell assembly 10, and the at least one side wall 23. An adhesive layer 25 is provided in the accommodating gap 24. The adhesive layer 25 is used to bond the rib 212 to the side wall 23 , or to bond the rib 212 to the battery cell assembly 10 . The adhesive layer 25 is also used to seal the receiving gap 24 .

[0110] Exemplarily, the rib 212 is located on the inner side of the side wall 23 .

[0111] Illustratively, the adhesive layer 25 includes a first layer 251 , and the first layer 251 is located between the rib 212 and the at least one side wall 23 .

[0112] That is to say, the adhesive layer 25 is provided with a first layer 251, and the first layer 251 is located in the accommodation gap 24 between the rib 212 and at least one side wall 23. The rib 212 and at least one side wall 23 are bonded together through the first layer 251, which is beneficial to increase the contact area between the cover body 21 and the side wall 23.

[0113] In some embodiments, the adhesive layer 25 includes a second layer, and the second layer is located between the rib 212 and the at least one battery cell assembly 10 .

[0114] In other words, the adhesive layer 25 is provided with a second layer, which is located in the accommodation gap between the rib 212 and the at least one battery cell assembly 10. The rib 212 and the at least one battery cell assembly 10 are bonded together by the second layer. The second layer bonds the cover 21 to the battery cell assembly 10, thereby improving the integrity of the battery device and thereby enhancing the overall structural strength and reliability of the battery device.

[0115] The surface of the rib 212 facing the battery cell assembly 10 along the first direction is bonded to the surface of the battery cell assembly 10 facing the cover 21 along the first direction through the second layer.

[0116] In some embodiments, the first layer 251 is connected to the second layer.

[0117] Since the first layer 251 is connected to the second layer, it is beneficial to improve the integrity of the adhesive layer 25, thereby increasing the bonding area between the cover body 21 and the side wall and the battery cell assembly 10. While improving the connection reliability between the cover body 21 and the side wall and the battery cell assembly 10, it also improves the sealing performance between the cover body 21 and the side wall 23 and the battery cell assembly 10.

[0118] In some embodiments, the first layer 251 is spaced apart from the second layer.

[0119] Since the first layer 251 is spaced apart from the second layer, the use of the adhesive layer 25 is reduced, the cost is lowered, and the arrangement of the first layer 251 and the second layer is facilitated.

[0120] Optionally, the number of battery cell assemblies 10 may be one, two, three, or more.

[0121] In some embodiments, as Figure 3 As shown, the plurality of battery cell assemblies 10 may be arranged along the second direction and / or the third direction.

[0122] In some embodiments, the plurality of side walls 23 include two side walls 23 opposite to each other along the second direction (eg Figure 3 The first side wall 231 and the second side wall 232 shown in FIG. 2 and the two side walls 23 opposite to each other along the third direction (eg Figure 3 The third side wall 233 and the fourth side wall 234 are shown).

[0123] The following description takes the side wall 23 as the first side wall 231 as an example.

[0124] Optionally, the first end and the first wall 22 may be directly connected or indirectly connected. For example, the first end and the first wall 22 may be bonded together or connected by external connecting members such as bolts and iron.

[0125] Alternatively, the first end of the side wall 23 may abut against the side of the first wall 22 that faces the battery cell 11 along the first direction; or the end edge of the first wall 22 may abut against the first end of the side wall 23, for example. Figure 2 Taking the orientation shown as an example, the front end edge of the first wall 22 abuts against the inner end surface of the first end of the first side wall 231 .

[0126] Optionally, the second end and the cover body 21 may be directly or indirectly connected. For example, the second end and the cover body 21 may be bonded together or connected by external connecting members such as bolts or iron.

[0127] Alternatively, the second end of the side wall 23 may abut against the side of the cover 21 that faces the battery cell 11 along the first direction; or the end edge of the cover 21 may abut against the second end of the side wall 23, for example. Figure 2 Taking the illustrated position as an example, the front end edge of the cover body 21 abuts against the inner end surface of the second end of the first side wall 231 .

[0128] In some embodiments, the accommodating cavity is not in communication with the outside world.

[0129] In some embodiments, the cover 21 is configured as an insulating cover.

[0130] Optionally, the outer surface of the cover 21 is insulated or the entire cover 21 is made of an insulating material.

[0131] In some embodiments, the cover 21 is made of a resin material, or a fiber-reinforced resin composite material, or a metal material with an insulating layer 2333 .

[0132] For example, Figures 11 to 15 As shown, the connection between the cover body 21 and the plurality of side walls 23 is filled with an adhesive layer 25 , and the adhesive layer 25 is made of an adhesive.

[0133] Here, the provision of the adhesive layer 25 is beneficial to improving the connection reliability and sealing between the cover 21 and the plurality of side walls 23 .

[0134] Exemplarily, the connection between the first wall 22 and the plurality of side walls 23 is filled with an adhesive layer 25 .

[0135] Here, provision of the adhesive layer 25 is beneficial for improving the connection reliability and sealing between the first wall 22 and the plurality of side walls 23 .

[0136] Exemplarily, the joints between the multiple side walls 23 are filled with an adhesive layer 25 .

[0137] Here, the provision of the adhesive layer 25 is beneficial to improving the connection reliability and sealing between the multiple side walls 23 .

[0138] Illustratively, at least one side wall 23 is higher than the top wall of the battery cell assembly 10 . This helps to improve the protection of the battery box to the battery cell assembly 10 and facilitates the application of adhesive to the top wall of the battery cell assembly 10 near the side wall 23 .

[0139] The number of the rib 212 can be one or more.

[0140] The term "multiple" in the embodiments of the present application refers to a number of two or more.

[0141] In some embodiments, see Figures 10 to 12 At least one rib 212 is connected to a side of the cover body 211 facing the battery cell assembly 10 , that is, in the first direction, the rib 212 is located between the cover body 211 and the battery cell assembly 10 .

[0142] Here, the rib 212 and the cover body 211 can be an integrated structure, which helps reduce parts and improve the assembly efficiency of the battery device 100. Of course, the rib 212 and the cover body 211 can also be a separate structure, which facilitates the molding of the cover 21.

[0143] The rib 212 corresponds to the side wall 23 , that is, the extending direction of the rib 212 is the same as the extending direction of the side wall 23 corresponding to the rib 212 , so as to form an accommodating gap 24 between the rib 212 and the side wall 23 corresponding to the rib 212 .

[0144] For example, some of the side walls 23 may be provided with the convex ribs 212 , or all of the side walls 23 may be provided with the convex ribs 212 .

[0145] For example, the convex rib 212 may extend along the second direction, or may extend along the third direction, or a portion of the convex rib 212 may extend along the second direction, and another portion of the convex rib 212 may extend along the third direction.

[0146] The surface of the rib 212 that faces the battery cell assembly 10 along the first direction is adhered to the surface of the battery cell assembly 10 that faces the cover 21 along the first direction through the adhesive layer 25 (second layer). That is, the rib 212 is adhered to the top wall of the battery cell assembly 10 through the adhesive layer 25 (second layer). In this way, the cover 21 and the battery cell assembly 10 can be connected as a whole, which not only improves the connection reliability of the cover 21, but also helps to improve the overall structural strength and stability of the battery device 100.

[0147] For example, before assembling the cover body 21, an adhesive can be applied at the junction of the top wall and the side wall 23 of the battery cell assembly 10, and then the surface of the rib 212 facing the battery cell assembly 10 in the first direction is bonded to the surface of the battery cell assembly 10 facing the cover body 21 in the first direction through the adhesive layer 25. The adhesive layer 25 can be squeezed into the accommodation gap 24 between the rib 212 and the side wall 23. The rib 212 and the side wall 23 are in surface-to-surface contact, which is beneficial to increase the bonding area between the cover body 21 and the side wall 23. While improving the connection reliability between the cover body 21 and the side wall 23, it can also reduce the possibility of external liquid entering the accommodation cavity through the gap between the cover body 21 and the side wall 23, thereby improving the sealing performance between the cover body 21 and the side wall 23.

[0148] In the battery device 100 provided by the present embodiment, the cover 21, first wall 22, and multiple side walls 23 enclose a sealed accommodating chamber. This creates a sealed space within the battery case, preventing interference from the external environment and providing a stable internal environment for components within the battery case (e.g., battery cells 11). This reduces the probability of damage or destruction of components within the battery case (e.g., battery cells 11) due to environmental influences, thereby improving the reliability of the battery device 100. The cover 21 is configured to include a cover body 211 and a rib 212. A accommodating gap 24 is defined between the rib 212, at least one battery cell assembly 10, and at least one side wall 23, and an adhesive layer 25 is disposed within the accommodating gap 24. Therefore, the adhesive layer 25 can be disposed between the rib 212 and the side wall 23, thereby increasing the bonding area between the cover 21 and the side wall 23. This not only improves the connection reliability between the cover 21 and the side wall 23, but also enhances the sealing performance between the cover 21 and the side wall 23. Since the cover body 21 and the multiple side walls 23 are bonded together by the adhesive layer 25, compared with the fastening connection by fasteners, the cover body 21 and the side walls 23 provided in the embodiment of the present disclosure do not require additional flange surfaces for fastening connection, which is beneficial to reducing the structural size of the battery box, thereby improving the space utilization of the battery box and thus improving the energy density of the battery device 100.

[0149] In some embodiments, as Figure 2 and Figure 3 As shown, the battery cell assembly 10 includes a plurality of battery cells 11 arranged along the second direction, and the battery cell 11 includes a housing 112 (see Figure 16), the housing 112 defines a storage space 115 through connected housing walls. A large housing wall 1121 of the housing walls is perpendicular to the second direction, wherein the large housing wall 1121 is the largest housing wall. Multiple side walls 23 include a first side wall 231 and a second side wall 232 arranged opposite each other along the second direction, and a third side wall 233 and a fourth side wall 234 arranged opposite each other along the third direction. The first direction, the second direction, and the third direction intersect with each other. The battery case includes a bottom plate, a first end plate, a second end plate, a first side plate, and a second side plate. The bottom plate constitutes the first wall 22. The first and second end plates constitute the first and second side walls 231 and 232, respectively. The first and second side plates constitute the third and fourth side walls 233 and 234, respectively. At least one battery cell assembly 10 is supported on the bottom plate. The first end plate, the second end plate, the first side plate, and the second side plate all contact at least one battery cell 11.

[0150] In a specific embodiment, Figure 3 and Figure 16 As shown, the battery cells 11 in the same battery cell assembly 10 are arranged with their large housing walls 1121 facing each other. For example, the battery cells 11 in the same battery cell assembly 10 are arranged along the second direction, and the large housing walls 1121 of each battery cell 11 in the same battery cell assembly 10 are substantially perpendicular to the second direction. The large housing wall 1121 of the battery cell 11 refers to the housing wall with the largest outer surface area among the housing walls of the outer shell 112 of the battery cell 11.

[0151] In some embodiments, as Figure 16 As shown, the battery cell 11 includes a housing 112 and an electrode assembly 114 located within the housing 112 .

[0152] In some embodiments, the electrode assembly 114 is a laminate structure, and the positive electrode, the negative electrode, and the separator in the electrode assembly 114 are arranged along the second direction.

[0153] In some embodiments, the electrode assembly 114 is a wound structure, and the electrode assembly 114 has a straight region and a corner region. The positive electrode, the negative electrode, and the separator located in the straight region are arranged along the second direction.

[0154] In some embodiments, the expansion of the battery cell 11 along the direction in which the positive electrode, the negative electrode, and the separator are arranged is greater than the expansion of the battery cell 11 along a direction intersecting the direction in which the positive electrode, the negative electrode, and the separator are arranged. For example, the expansion of the battery cell 11 along the second direction is greater than the expansion of the battery cell 11 along the first direction, and the expansion of the battery cell 11 along the second direction is greater than the expansion of the battery cell 11 along the third direction.

[0155] In some implementations, along the second direction, one side of the first end plate and / or the second end plate has a reinforcing rib, thereby increasing the strength of the first end plate and / or the second end plate.

[0156] In some embodiments, along the second direction, the first end plate and / or the second end plate has reinforcing ribs on the side facing away from the accommodating cavity, thereby not only strengthening the strength of the first end plate and / or the second end plate, but also avoiding occupying space in the battery box.

[0157] In some embodiments, there are multiple reinforcing ribs, and the multiple reinforcing ribs are cross-arranged.

[0158] In some embodiments, the first end plate and / or the second end plate are made of metal.

[0159] In some embodiments, the first end plate and / or the second end plate can be equivalent to an expansion beam, which is used to resist the expansion force of the battery cell 11 along the second direction by arranging the two ends of the battery cell 11 in the same battery cell assembly 10 along the arrangement direction between the first end plate and the second end plate.

[0160] The large-surface shell wall 1121 in the battery cell 11 is more likely to be deformed due to the charging and / or discharging of the battery cell 11. Therefore, by setting the first side wall 231 and the second side wall 232 arranged opposite to each other along the second direction as the first end plate and the second end plate respectively, and making the large-surface shell wall 1121 perpendicular to the second direction, the first end plate and the second end plate can be used to resist the expansion force of the battery cell 11 along the second direction, thereby reducing the probability or degree of deformation of the large-surface shell wall 1121 caused by the increase in pressure inside the battery cell 11 due to the charging and / or discharging of the battery cell 11, thereby reducing the probability of deformation of the battery device 100 or reducing the degree of deformation of the battery device 100.

[0161] Since the bottom plate is formed as the first wall 22, the first end plate and the second end plate are respectively formed as the first side wall 231 and the second side wall 232, and the first side plate and the second side plate are respectively formed as the third side wall 233 and the fourth side wall 234, that is to say, the side wall 23 and the first wall 22 of the battery box are both plate-like structures. This structure is simple, forming a simple battery box.

[0162] Because the large housing wall 1121 of the battery cell 11 is more likely to deform due to charging and / or discharging of the battery cell 11, the first and second end plates are configured as thick plate structural members having a certain thickness, so that the first and second end plates can resist the expansion force of the battery cell 11 in the second direction. The third and fourth side walls 233 and 234 are configured as thin plate structural members, which helps further improve the energy density of the battery device 100.

[0163] In a specific embodiment, the battery device 100 includes a plurality of battery cell assemblies 10, and the plurality of battery cell assemblies 10 are arranged along a third direction. Along the third direction, the battery cell assembly 10 closest to the third side wall 233 contacts the third side wall 233, and along the third direction, the battery cell assembly 10 closest to the fourth side wall 234 contacts the fourth side wall 234. Each battery cell assembly 10 contacts the first side wall 231, and each battery cell assembly 10 contacts the second side wall 232.

[0164] Since multiple battery cell assemblies 10 are supported on the bottom plate, and the first end plate, the second end plate, the first side plate, and the second side plate are all in contact with at least one battery cell assembly 10, in the battery device 100, the bottom wall / top wall and the side wall 23 of the battery case can be in direct contact with the battery cell assembly 10, thereby further reducing the gaps in the battery case and further improving the energy density of the battery device 100.

[0165] In this embodiment, the cover 21, the bottom plate, the first end plate, the second end plate, the first side plate, and the second side plate are collectively formed into a battery case, and the battery cell assembly 10 is directly placed in the battery case collectively formed by the first end plate, the second end plate, the first side plate, and the second side plate, thereby forming a simple battery device 100 with a simple structure, easy manufacturing, and low production cost. Moreover, the first end plate, the second end plate, the first side plate, and the second side plate are all in contact with at least one battery cell assembly 10. Therefore, the gap in the battery case can be reduced, the space utilization of the battery case can be improved, and the energy density of the battery device 100 can be improved.

[0166] In some embodiments, see Figures 9 to 12 The rib 212 includes a first rib 2121 and a second rib 2122, and the accommodating gap 24 includes a first gap 241 and a second gap 242. There is a first gap 241 between the first rib 2121 and the first side plate, and there is a second gap 242 between the second rib 2122 and the second side plate.

[0167] There is a first gap 241 between the first rib 2121 and the first side panel, which means that the first gap 241 is defined between the first rib 2121 and the surface opposite to the first side panel, that is, there is a first gap 241 between the surface of the first side panel facing the accommodating cavity and the surface of the first rib 2121 facing the first side panel.

[0168] There is a second gap 242 between the second rib 2122 and the second side plate, which means that the second gap 242 is defined between the second rib 2122 and the surface opposite to the second side plate, that is, there is a second gap 242 between the surface of the second side plate facing the accommodating cavity and the surface of the second rib 2122 facing the second side plate.

[0169] In the embodiment in which the cover body 21 and the plurality of side walls 23 are bonded together by the adhesive layer 25 (the first layer 251), the end surface of the side wall 23 facing the cover body 21 is bonded together with the cover body 21 by the adhesive. However, since the first side plate and the second side plate are configured as thin plate structural members, the end surface area of the first side plate and the second side plate facing the cover body 21 is relatively small, resulting in a relatively small bonding area between the side wall 23 and the cover body 21. By providing the first rib 2121 and the second rib 2122, a first gap 241 is formed between the first rib 2121 and the first side plate, and a second gap 241 is formed between the second rib 2122 and the first side plate. There is a second gap 242 between the second side panels. During assembly, the bottoms of the first rib 2121 and the second rib 2122 are fitted with the top surface of the battery cell assembly 10, and the adhesive layer 25 is squeezed into the first gap 241 between the first rib 2121 and the first side panel and the second gap 242 between the second rib 2122 and the second side panel, which is beneficial to increase the bonding area between the cover 21 and the first side panel and the second side panel, and at the same time improves the connection reliability between the cover 21 and the first side panel and the second side panel, it also improves the sealing performance between the cover 21 and the first side panel and the second side panel.

[0170] In some embodiments, see Figures 9 to 12 The cover body 21 further includes at least one shielding flange 213 connected to the cover body 211, a portion of the shielding flange 213 shields the accommodating gap 24 along the first direction, and another portion is folded and located on the side of the side wall 23 away from the accommodating cavity.

[0171] Here, the shielding flange 213 and the cover body 211 can be an integrated structure, which helps reduce parts and improve the assembly efficiency of the battery device 100. Of course, the shielding flange 213 and the cover body 211 can also be a separate structure, which facilitates the molding of the cover 21.

[0172] The number of the shielding flanges 213 may be one or more.

[0173] For example, the cover body 211 may be provided with shielding flanges 213 along the entire circumference, or may be provided with shielding flanges 213 in a partial area along the circumference.

[0174] For example, the cover body 211 may have a shielding flange 213 corresponding to the side provided with the rib 212, that is, the rib 212 corresponds one to one with the shielding flange 213. Of course, in other embodiments, the cover body 211 may also have a shielding flange 213 on the side not provided with the rib 212.

[0175] A portion of the shielding flange 213 blocks the accommodating gap 24 along the first direction, and another portion is folded over and located on the side of the side wall 23 away from the accommodating cavity. That is, a portion of the shielding flange 213 is located above the accommodating gap 24, and another portion is folded over and located on the side of the side wall 23. In this way, the shielding flange 213 can shield the connection between the cover body 21 and the end face of the side wall 23 and the side of the side wall 23.

[0176] In this embodiment, by setting the cover body 21 to include a cover body 211 and a shielding flange 213, the shielding flange 213 can shield the connection between the cover body 21 and the end face of the side wall 23 and the side of the side wall 23, thereby reducing the possibility of dripping water or condensed water entering the accommodating gap 24 through the gap between the end face of the cover body 21 and the side wall 23, and reducing the possibility of dripping water or condensed water gathering at the glue coating interface, thereby reducing the possibility of dripping water or condensed water entering the accommodating cavity.

[0177] It should be noted that the size of the shielding flange 213 in the first direction is not limited.

[0178] Exemplarily, the dimension of the shielding flange 213 in the first direction is larger than the dimension of the rib 212 in the first direction. This further helps to reduce the possibility of dripping water or condensed water entering the accommodating gap 24 through the gap between the end face of the cover body 21 and the side wall 23, and reduces the possibility of dripping water or condensed water gathering at the glue coating interface.

[0179] Of course, in other embodiments, the dimension of the shielding flange 213 in the first direction may also be smaller than or equal to the dimension of the rib 212 in the first direction.

[0180] In some embodiments, please refer to Figures 9 to 12 The shielding flange 213 includes a first shielding flange 2131 and a second shielding flange 2132. A portion of the first shielding flange 2131 blocks the first gap 241 along the first direction, and another portion is folded over and located on the side of the first side panel facing away from the accommodating cavity along the third direction. The first shielding flange 2131 and the first rib 2121 form a first slot, and a portion of the first side panel is inserted into the first slot. A portion of the second shielding flange 2132 blocks the second gap 242 along the first direction, and another portion is folded over and located on the side of the second side panel facing away from the accommodating cavity along the third direction. The second shielding flange 2132 and the second rib 2122 form a second slot, and a portion of the second side panel is inserted into the second slot.

[0181] The first shielding flange 2131 is closer to the edge of the cover 21 than the first rib 2121 , that is, the first shielding flange 2131 is arranged outside the first rib 2121 so that the first shielding flange 2131 and the first rib 2121 form a first slot.

[0182] The second shielding flange 2132 is closer to the edge of the cover 21 than the second rib 2122 , that is, the second shielding flange 2132 is arranged outside the second rib 2122 so that the second shielding flange 2132 and the second rib 2122 form a second slot.

[0183] Since the first shielding flange 2131 and the first rib 2121 form a first slot, a portion of the first side panel is inserted into the first slot, and the second shielding flange 2132 and the second rib 2122 form a second slot, a portion of the second side panel is inserted into the second slot, which can play a positioning role between the cover body 21 and the first side panel and the second side panel, and is beneficial to improving the assembly efficiency and assembly accuracy of the battery box.

[0184] For example, the cover body 211 is constructed as a large flat plate, and ribs or patterns can be designed on the cover body 211 as needed to improve the structural strength or aesthetics of the cover body 211 .

[0185] In some embodiments, see Figures 13 to 15 The cover body 21 is bonded to the end surfaces of the first end plate and the second end plate close to the cover body 21.

[0186] That is, both ends of the cover 21 along the second direction are bonded to the top surfaces of the first end plate and the second end plate respectively.

[0187] For example, see Figures 7 and 8 , at least one of the first end plate and the second end plate is configured to have a step portion 2311 and a flange portion 2312 at the end portion close to the cover body 21 along the first direction, the step portion 2311 and the flange portion 2312 both extend along the third direction, the step portion 2311 has a first step surface 2313, a rising surface 2314, and a second step surface 2315 connected in sequence, along the second direction, the flange portion 2312 is located on the side where the accommodating cavity is located compared to the step portion 2311, and the second step surface 2315 is located between the first step surface 2313 and the flange portion 2312, along the first direction, the first step surface 2313 is located farther away from the bottom plate than the second step surface 2315 and the flange portion 2312, and the end edge of the cover body 21 along the second direction (for example Figure 3 The front end edge shown in FIG. 2 abuts against the rising surface 2314, and the cover body 21 abuts against the second step surface 2315 along the first direction.

[0188] In some embodiments, both the first end plate and the second end plate are configured to have a step portion 2311 and a flange portion 2312 at the end portion close to the cover body 21 along the first direction.

[0189] In some embodiments, the flange portion 2312 and the step portion 2311 are arranged along the second direction, and along the second direction, the flange portion 2312 is closer to the side of the accommodating cavity than the step portion 2311. Furthermore, the flange portion 2312 and the step portion 2311 are arranged alternately along the second direction.

[0190] In some embodiments, along the first direction, the first step surface 2313 is farther away from the bottom plate than the second step surface 2315 and the flange portion 2312 , and the rising surface 2314 is connected between the first step surface 2313 and the second step surface 2315 .

[0191] In some embodiments, the surface of the cover body 21 along the second direction abuts against the rising surface 2314 , and the surface of the cover body 21 along the first direction facing the accommodating cavity abuts against the second step surface 2315 and the flange portion 2312 .

[0192] In some embodiments, at least one of the first step surface 2313 , the second step surface 2315 , and the surface of the flange portion 2312 facing the cover body 21 along the first direction is configured as a flat surface.

[0193] In some embodiments, the first step surface 2313 , the second step surface 2315 , or the surface of the flange portion 2312 facing the cover body 21 along the first direction may also be a curved surface with a slight curvature.

[0194] In some embodiments, as Figure 8 As shown, the number of flange portions 2312 is one or more.

[0195] In some embodiments, the plurality of flange portions 2312 are spaced apart along the second direction.

[0196] In some embodiments, along the second direction, there is structural adhesive between the step portion 2311 and the flange portion 2312, and the structural adhesive bonds the first end plate and / or the second end plate to the cover plate.

[0197] In some embodiments, along the second direction, there is structural adhesive between adjacent flange portions 2312, and the structural adhesive bonds the first end plate and / or the second end plate to the cover plate.

[0198] Since the cover 21 abuts against the second step surface 2315 and the rising surface 2314 , the relative positions of the cover 21 and the first end plate and / or the second end plate are fixed, thereby reducing the difficulty of assembling the battery box.

[0199] In some embodiments, along the second direction, a gap is formed between the step portion 2311 and the flange portion 2312 .

[0200] In some embodiments, the gap is filled with structural adhesive.

[0201] Thus, the gap between the step portion 2311 and the flange portion 2312 can be filled with other components.

[0202] By bonding the cover 21 to the end surfaces of the first and second end plates near the cover 21, the connection structure is simple and reduces the use of fasteners, thereby reducing costs. Because the first and second end plates are thick plate structures with a certain thickness, the connection strength between the cover 21 and the first and / or second end plates is further improved.

[0203] In some embodiments, see Figures 7 and 8 At least one of the first end plate and the second end plate is configured to have a glue overflow groove 2316 formed on the end surface close to the cover body 21 along the first direction.

[0204] That is to say, the first end plate may be formed with a glue overflow groove 2316 on the end surface close to the cover body 21 along the first direction, or the second end plate may be formed with a glue overflow groove 2316 on the end surface close to the cover body 21 along the first direction, or both the first end plate and the second end plate may be formed with a glue overflow groove 2316 on the end surface close to the cover body 21 along the first direction.

[0205] It should be noted that there is no limitation on the specific number of the overflowing glue grooves 2316. The overflowing glue grooves 2316 can be one or more.

[0206] To a certain extent, the sealing performance and connection strength between the cover 21 and the first end plate and / or the second end plate can be improved by increasing the number of the glue overflow grooves 2316 .

[0207] Exemplarily, the gap between the step portion 2311 and the flange portion 2312 constitutes a glue overflow groove 2316 , and / or the gap between the flange portion 2312 constitutes a glue overflow groove 2316 .

[0208] Exemplarily, the glue overflow groove 2316 extends along the third direction.

[0209] Exemplarily, a glue overflow groove 2316 is provided on the second step surface 2315 .

[0210] By providing the glue overflow groove 2316, when the cover body 21 is assembled, the cover body 21 squeezes the excess adhesive into the glue overflow groove 2316. The glue overflow groove 2316 can not only improve the situation where the excess adhesive overflows the glue coating interface and affects the appearance and function, but also reduce the glue cleaning work. At the same time, the glue overflow groove 2316 can also allow the glue coating interface to retain sufficient adhesive, thereby improving the situation where local adhesive is poor due to problems such as poor part flatness and the like, which affects the sealing effect.

[0211] In this embodiment, by configuring at least one of the first end plate and the second end plate to have a glue overflow groove 2316 formed on the end face close to the cover body 21 along the first direction, not only can the connection strength between the cover body 21 and the first end plate and / or the second end plate be enhanced, thereby enhancing the stability of the overall structure of the battery case, but also the cover body 21 and the first end plate and / or the second end plate can be sealed, thereby improving the sealing performance of the battery case.

[0212] In some embodiments, see Figure 3 and Figure 6 At least one of the first and second side panels is configured to include a side panel main portion 2331 and a side panel flange portion 2332. The side panel main portion 2331 is configured to be plate-shaped and extend in the first direction. The side panel flange portion 2332 is connected to one end of the side panel main portion 2331 along the first direction. The side panel flange portion 2332 is located on a side of the bottom panel facing away from the cover body 21 along the first direction and is connected to the bottom panel.

[0213] The first side panel may be configured to have a side panel main body 2331 and a side panel flange 2332, the second side panel may be configured to have a side panel main body 2331 and a side panel flange 2332, or both the first side panel and the second side panel may be configured to have a side panel main body 2331 and a side panel flange 2332.

[0214] In some embodiments, the side panel flange portion 2332 is bent relative to the side panel main body portion 2331 .

[0215] In some embodiments, the side panel main body 2331 and the side panel flange portion 2332 can be directly connected or indirectly connected. In a specific embodiment, the side panel main body 2331 and the side panel flange portion 2332 are integrally formed.

[0216] In some embodiments, both sides of the battery module along the third direction (eg Figure 3 A side panel main body 2331 is provided on both the left and right sides shown.

[0217] In some embodiments, the surface of the bottom plate on the side facing away from the cover 21 along the first direction (eg Figure 3 The lower surface shown in FIG) has two ends along the third direction (such as Figure 3 The left and right ends shown) are both in contact with different side panel flange portions 2332.

[0218] In some embodiments, the side plate main body portion 2331 of the first side plate and the side plate main body portion 2331 of the second side plate are respectively located on opposite sides of the bottom plate along the third direction (eg Figure 3 The left and right sides shown in the figure), the side panel flange portion 2332 of the first side panel and the side panel flange portion 2332 of the second side panel are both located on the side of the bottom panel away from the cover body 21 along the first direction and are connected to the bottom panel.

[0219] In some embodiments, as Figure 3 and Figure 6 As shown, the side of the side panel flange 2332 facing away from the accommodating cavity along the first direction is configured to have a protrusion 2334, which is raised away from the accommodating cavity. Thus, the protrusion 2334 can strengthen the strength of the side panel flange 2332, thereby increasing the support force of the side panel flange 2332 on the bottom plate.

[0220] In some embodiments, the raised portion 2334 may be formed by thickening a portion of the side panel flange portion 2332 .

[0221] In some embodiments, the raised portion 2334 may be formed by a portion of the side panel flange portion 2332 being recessed along the first direction away from the cover body 21 .

[0222] In some embodiments, the protrusion 2334 extends along the second direction.

[0223] In some embodiments, the number of the protrusions 2334 may be one or more. The protrusions 2334 may be spaced apart along the second direction or the third direction.

[0224] In some embodiments, the surface of the protrusion 2334 that faces away from the accommodating cavity along the first direction is a flat surface.

[0225] Because the side panel flange portion 2332 is located on the side of the bottom panel facing away from the cover 21 along the first direction and is connected to the bottom panel, the side panel flange portion 2332 can provide support for the bottom panel, thereby improving the bottom panel's load-bearing capacity. Furthermore, at least one of the first and second side panels is configured to include a side panel body portion 2331 and a side panel flange portion 2332. During assembly of the first and / or second side panels with the other walls of the battery case, the first and / or second side panels can abut against the bottom panel, securing their relative positions, thereby reducing the difficulty of assembling the battery case.

[0226] In some embodiments, a medium flow channel is provided inside the first wall 22 , in which a heat exchange medium flows. The heat exchange medium exchanges heat with the battery cell assembly 10 , and the heat exchange medium absorbs heat generated by the battery cell assembly 10 .

[0227] In some embodiments, a medium flow channel is provided inside the bottom plate.

[0228] Optionally, the medium flow channel may extend along the second direction or the third direction.

[0229] In some embodiments, the number of the medium flow channels is multiple, and the multiple medium flow channels are spaced apart. Further, the multiple medium flow channels can be spaced apart along the second direction or along the third direction. Of course, the number of the medium flow channel can also be one.

[0230] In some embodiments, assuming that the first wall 22 includes a built-in medium flow channel, the first wall 22 is further provided with an opening and an outlet that are both connected to the medium flow channel. The opening allows the heat exchange medium to flow into the medium flow channel, and the outlet allows the heat exchange medium, which has undergone heat exchange, to flow out of the medium flow channel. The opening and outlet may be located on the same end face of the first wall 22 or on different end faces. Alternatively, the opening and outlet may be located on at least one end face of the first wall 22 that is perpendicular to the third direction.

[0231] In a specific embodiment, the first wall 22 has a plurality of media flow channels built therein, the media flow channels extending along the second direction, and the plurality of media flow channels being spaced apart along the third direction. Furthermore, the plurality of media flow channels are substantially parallel to each other.

[0232] In a specific embodiment, the heat exchange medium is water.

[0233] In a specific embodiment, the first wall 22 is configured as a liquid-cooled plate.

[0234] Because at least one of the first wall 22 and the second wall includes a heat exchange medium flow channel, the heat exchange medium in the heat exchange medium flow channel can remove heat generated by the battery cell assembly 10, thereby reducing the temperature of the battery cell assembly 10, reducing the probability of thermal runaway of the battery cell assembly 10, and thereby reducing the probability of thermal runaway of the battery cell assembly 100. Furthermore, no additional heat exchange components are required to exchange heat from the battery cell assembly 10, which helps improve the structural compactness and energy density of the battery assembly 100 while reducing manufacturing costs.

[0235] In some embodiments, see Figures 2 to 5 The battery device 100 further includes at least one restraining member 30, which is used to restrain the battery box, and at least one restraining member 30 is located outside the accommodating cavity.

[0236] In some embodiments, the restraint 30 is located outside the accommodating cavity. The restraint 30 can be disposed outside the battery case or embedded inside the battery case, for example, embedded in the first wall 22 and / or the cover 21 .

[0237] In some embodiments, the material of the restraining member 30 is high-strength spring steel or carbon steel.

[0238] Optionally, the number of the restraining members 30 may be one or more.

[0239] In some embodiments, the plurality of restraints 30 may be arranged substantially in parallel or in a non-parallel manner along the third direction or the second direction.

[0240] In some embodiments, see Figures 2 to 5 The arrangement direction of the plurality of restraints 30 may be substantially the same as the arrangement direction of the plurality of battery cell assemblies 10 .

[0241] In some embodiments, the tie 30 may extend along the third direction or the second direction.

[0242] Since the restraint 30 restrains the battery case, the restraint 30 can strengthen the strength of the battery case. Moreover, when the battery cell assembly 10 expands due to heat and squeezes the battery case, the restraint 30 can exert a restraining force on the battery case, reducing the probability of the battery cell assembly 10 releasing gas due to thermal runaway, which leads to an increase in gas in the battery case and partial bulging or even damage of the battery case, thereby enhancing the strength of the battery case. It can also reduce the probability or degree of deformation of the battery case, improve the outer contour dimensional accuracy of the battery device 100, and improve the appearance of the battery device 100. In addition, during the inflation test stage in the assembly production process of the battery device 100, the step of pressing the battery case to prevent bulging and deformation of the battery case can be eliminated, thereby improving production efficiency. Moreover, the restraint 30 is located outside the accommodating cavity, which can save space in the battery case and improve the energy density of the battery device 100.

[0243] In some embodiments, see Figures 2 to 4 The at least one restraining member 30 includes at least one first restraining member 31. Along the first direction, relative to the battery cell assembly 10, the first restraining member 31 is located on the side where the cover 21 is located, and / or, the at least one restraining member 30 includes at least one second restraining member 32. Along the first direction, relative to the battery cell assembly 10, the second restraining member 32 is located on the side where the first wall 22 is located, as shown in FIG. Figure 5 As shown, the restraint 30 includes a restraint main body 33 and a restraint connecting portion 34 . The restraint connecting portion 34 is located at both ends of the restraint main body 33 and is connected to the restraint main body 33 . The restraint connecting portion 34 is connected to the side wall 23 .

[0244] Optionally, the first restraining member 31 may be located on a side of the cover 21 away from the battery cell assembly 10 along the first direction; the first restraining member 31 may also be located inside the cover 21 .

[0245] Optionally, there may be one or more first restraining members 31. The plurality of first restraining members 31 may be arranged at intervals.

[0246] In a specific embodiment, a plurality of first restraining members 31 are spaced apart along the third direction.

[0247] Optionally, the second restraint 32 may be located on a side of the first wall 22 that is away from the battery cell assembly 10 along the first direction; the second restraint 32 may also be located within the first wall 22 .

[0248] Optionally, the number of the second restraining members 32 may be one or more, and the plurality of second restraining members 32 may be arranged at intervals.

[0249] In a specific embodiment, a plurality of second restraining members 32 are spaced apart along the third direction.

[0250] In some embodiments, as Figure 5 As shown, the restraint member 30 includes a restraint member 30 body portion and a restraint member connecting portion 34 connected to the restraint member 30 body portion. The restraint member connecting portion 34 is provided at both ends of the restraint member 30 body portion along the second direction.

[0251] Optionally, the main body of the restraint member 30 and the restraint member connecting portion 34 may be an integral piece or a separate structure.

[0252] Optionally, the material of the main body of the restraint member 30 and the material of the restraint member connecting portion 34 may be the same or different.

[0253] In some embodiments, the main body of the first restraint member 31 is connected to the first wall 22 , and the two restraint member connecting portions 34 of the first restraint member 31 are respectively connected to the two side walls 23 opposite to each other along the second direction or the third direction.

[0254] In some embodiments, the main body of the second restraint member 30 is connected to the second wall, and the two restraint member connecting portions 34 of the second restraint member 32 are respectively connected to the two side walls 23 opposite to each other along the second direction or the third direction.

[0255] In some embodiments, the tie member connection portion 34 may be directly connected to the side wall 23 or indirectly connected to the side wall 23. For example, the tie member connection portion 34 may be connected to the side wall 23 via a connection member.

[0256] Optionally, the restraint connection portion 34 is connected to the side of the side wall 23 perpendicular to the first direction; the restraint connection portion 34 may also be connected to the side of the first side wall 231 and / or the second side wall 232 perpendicular to the second direction; the restraint connection portion 34 may also be connected to the side of the third side wall 233 and / or the fourth side wall 234 perpendicular to the third direction.

[0257] In some embodiments, the connecting member includes a connecting portion and a connecting flange. The connecting portion passes through the tie member connecting portion 34 and at least a portion of the side wall 23 in sequence, and the connecting flange abuts against the tie member connecting portion 34 .

[0258] In some embodiments, the side wall 23 has a mounting boss, and the connector connects the mounting boss and the tie-down connector portion 34 .

[0259] Optionally, the connecting member may be a bolt or a screw.

[0260] Since the restraint connection portion 34 is connected to the side wall 23, under the pulling of the restraint 30, the side wall 23 respectively connected to the restraint connection portion 34 can clamp the battery cell assembly 10, reducing the probability of the battery cell assembly 10 expanding due to charging and / or discharging or reducing the degree of expansion of the battery cell assembly 10 due to charging and / or discharging.

[0261] It can be understood that the first restraining member 31 may also be provided on the side of at least any one of the first side wall 231 , the second side wall 232 , the third side wall 233 , and the fourth side wall 234 .

[0262] In some embodiments, see Figures 2 to 5 The restraint main body 33 is configured as a strip and its length direction is consistent with the second direction. The two restraint connecting parts 34 are respectively connected to the first side wall 231 and the second side wall 232.

[0263] The large-surface shell wall 1121 in the battery cell 11 is more likely to be deformed due to the charging and / or discharging of the battery cell 11. Since the large-surface shell wall 1121 is perpendicular to the second direction, and the two restraining member connecting portions 34 are respectively connected to the first side wall 231 and the second side wall 232, the large-surface shell wall 1121 can have a larger clamping force along the second direction. Thus, the probability or degree of deformation of the large-surface shell wall 1121 caused by the increase in pressure inside the battery cell 11 due to the charging and / or discharging of the battery cell 11 can be reduced, thereby reducing the probability of deformation of the battery device 100 or reducing the degree of deformation of the battery device 100.

[0264] In some embodiments, see Figures 2 to 4 The first end plate and the second end plate are both connected to the bottom plate. Along the first direction, the end surfaces of the first end plate and the second end plate (for example Figure 3 The lower end surface shown in FIG. 1 abuts against the surface of the bottom plate along the first direction toward the cover 21 (eg Figure 3 upper surface shown).

[0265] In some embodiments, along the first direction, the end surfaces of the first end plate and the second end plate (eg Figure 3 The lower end surface shown in the figure is connected to the surface of the bottom plate along the first direction facing the cover body 21 by means of structural adhesive.

[0266] In some embodiments, along the first direction, the first end plate is connected to the bottom plate via the second binding member 32 , and the second end plate is connected to the bottom plate via the second binding member 32 .

[0267] In some embodiments, the restraint body portion 33 of the second restraint member 32 is located on the side of the bottom plate away from the accommodating cavity along the first direction, and the restraint member connection portion 34 of the second restraint member 32 is respectively connected to the first end plate and the second end plate, thereby connecting the first end plate and the second end plate to the bottom plate.

[0268] Since the relative positions of the first end plate, the second end plate and the bottom plate are fixed, the difficulty of assembling the battery box is reduced.

[0269] In some embodiments, see Figure 6 、 Figure 11 and Figure 12 At least one of the first side plate and the second side plate includes a side plate body 2331 and an insulating layer 2333. The side plate body 2331 is in a plate shape extending along the first direction. The insulating layer 2333 is disposed between the side plate body 2331 and the battery cell assembly 10, and the insulating layer 2333 is in contact with at least one battery cell 11.

[0270] The first side plate may be configured to have a side plate main body 2331 and an insulating layer 2333, the second side plate may be configured to have a side plate main body 2331 and an insulating layer 2333, or both the first side plate and the second side plate may be configured to have a side plate main body 2331 and an insulating layer 2333.

[0271] Exemplarily, the insulating layer 2333 may extend along the first direction.

[0272] Illustratively, the insulating layer 2333 may be an insulating coating applied to the side plate main body 2331 , or may be a plate-shaped structure formed of an insulating material.

[0273] By constructing at least one of the first side plate and the second side plate to include a side plate main body 2331 and an insulating layer 2333, and contacting at least one battery cell 11 through the insulating layer 2333, it is beneficial to improve the insulation performance between the box assembly 20 and the battery cell 11, thereby improving the reliability of the battery device 100.

[0274] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the present application.

Claims

1. A battery device, characterized in that: include: A battery case, comprising a cover, a first wall, and a plurality of side walls, wherein the first wall and the cover are arranged opposite to each other along a first direction, a first end of each side wall along the first direction is connected to the first wall, and a second end of each side wall along the first direction is connected to the cover, wherein the first wall, the cover, and the plurality of side walls enclose a sealed accommodation cavity; At least one battery cell assembly, accommodated in the accommodation cavity; The cover comprises a cover body and at least one rib, wherein the at least one rib is connected to a side of the cover body facing the battery cell assembly. There is an accommodating gap between the rib, at least one battery cell assembly and at least one side wall. There is an adhesive layer in the accommodating gap. The adhesive layer is used to bond the rib to the side wall, or to bond the rib to the battery cell assembly. The adhesive layer is also used to seal the accommodating gap.

2. The battery device according to claim 1, wherein: The adhesive layer includes a first layer, the first layer is located between the rib and at least one of the side walls; and / or, The adhesive layer includes a second layer, and the second layer is located between the rib and at least one of the battery cell assemblies.

3. The battery device according to claim 2, characterized in that The first layer is connected to the second layer; or, The first layer is spaced apart from the second layer.

4. The battery device according to claim 1, wherein: The battery cell assembly includes a plurality of battery cells arranged along a second direction, the battery cells including a housing, the housing defining a housing space through connected housing walls, a large housing wall among the housing walls being perpendicular to the second direction, wherein the large housing wall is the housing wall with the largest area among the housing walls, The plurality of side walls include a first side wall and a second side wall arranged opposite to each other along the second direction, and a third side wall and a fourth side wall arranged opposite to each other along a third direction, wherein the first direction, the second direction, and the third direction intersect each other. The battery box includes a bottom plate, a first end plate, a second end plate, a first side plate and a second side plate. The bottom plate is formed as the first wall, The first end plate and the second end plate constitute the first side wall and the second side wall respectively. The first side plate and the second side plate constitute the third side wall and the fourth side wall respectively. The at least one battery cell assembly is supported on the bottom plate, and the first end plate, the second end plate, the first side plate, and the second side plate are all in contact with at least one battery cell.

5. The battery device according to claim 4, characterized in that The convex rib includes a first convex rib and a second convex rib, the accommodating gap includes a first gap and a second gap, the first convex rib and the first side plate have the first gap, and the second convex rib and the second side plate have the second gap.

6. The battery device according to claim 4, characterized in that The cover body further comprises at least one shielding flange connected to the cover body. A portion of the shielding flange shields the accommodating gap along the first direction, and another portion is folded and located on a side of the side wall away from the accommodating cavity.

7. The battery device according to claim 6, characterized in that The convex rib includes a first convex rib and a second convex rib, the accommodation gap includes a first gap and a second gap, the first convex rib and the first side plate have the first gap, the second convex rib and the second side plate have the second gap, The shielding flange includes a first shielding flange and a second shielding flange, A portion of the first shielding flange blocks the first gap along the first direction, and another portion is folded and located on a side of the first side panel facing away from the accommodating cavity along the third direction. The first shielding flange and the first rib form a first slot, and a portion of the first side panel is inserted into the first slot. A portion of the second shielding flange blocks the second gap along the first direction, and another portion is folded and located on the side of the second side panel away from the accommodating cavity along the third direction. The second shielding flange and the second rib form a second slot, and a portion of the second side panel is inserted into the second slot.

8. The battery device according to claim 4, wherein: The cover body is bonded to the end surfaces of the first end plate and the second end plate close to the cover body.

9. The battery device according to claim 8, characterized in that At least one of the first end plate and the second end plate is configured to have a glue overflow groove formed on an end surface close to the cover body along the first direction.

10. The battery device according to any one of claims 4 to 9, characterized in that At least one of the first side panel and the second side panel is configured to include a side panel body portion and a side panel flange portion. The side plate main body is configured as a plate extending along the first direction. The side plate flange portion is connected to one end of the side plate main body portion along the first direction, and the side plate flange portion is located on a side of the bottom plate away from the cover body along the first direction and is connected to the bottom plate.

11. The battery device according to any one of claims 4 to 9, characterized in that: The bottom plate is provided with a medium flow channel therein.

12. The battery device according to any one of claims 4 to 9, characterized in that: The first end plate and the second end plate are both connected to the bottom plate. Along the first direction, end surfaces of the first end plate and the second end plate abut against a surface of the bottom plate facing the cover body along the first direction.

13. The battery device according to any one of claims 4 to 9, characterized in that At least one of the first side plate and the second side plate is configured to include a side plate main body and an insulating layer. The side plate main body is configured in a plate shape extending along the first direction. The insulating layer is provided between the side plate main body and the battery cell assembly. The insulating layer is in contact with at least one of the battery cells.

14. The battery device according to any one of claims 4 to 9, characterized in that The battery device further includes at least one restraining member, which is used to restrain the battery box, and the at least one restraining member is located outside the accommodating cavity.

15. The battery device according to claim 14, characterized in that The at least one restraining member includes at least one first restraining member, and along the first direction, relative to the battery cell assembly, the first restraining member is located on the side where the cover is located, and / or, The at least one restraining member includes at least one second restraining member, and along the first direction, relative to the battery cell assembly, the second restraining member is located on the side where the first wall is located, The restraint member includes a restraint member main body and a restraint member connecting portion. The restraint member connecting portions are located at both ends of the restraint member main body and are both connected to the restraint member main body. The restraint member connecting portions are connected to the side wall.

16. The battery device according to claim 15, characterized in that The restraint member main body is configured in a strip shape, and a length direction thereof is consistent with the second direction. The two restraint member connecting portions are respectively connected to the first side wall and the second side wall.

17. An electrical device, characterized in that: The electrical device comprises the battery device according to any one of claims 1 to 16.

18. An energy storage device, characterized in that: The energy storage device comprises the battery device according to any one of claims 1 to 16.

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