Battery device, electric device, and energy storage device

Abstract

The embodiments of the present disclosure provide a battery device, a power consumption device and an energy storage device. The battery device comprises a battery box and at least one battery cell assembly. The battery box comprises a cover, a first wall and a plurality of side walls. The first wall is arranged opposite to the cover 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. The first wall, the cover and the plurality of side walls enclose a sealed accommodating cavity. The battery cell assembly is accommodated in the accommodating cavity. The cover comprises a cover body and at least one protruding rib. The at least one protruding rib is connected to a side of the cover body facing the battery cell assembly. There is an accommodating gap between the protruding rib, the battery cell assembly and at least one side wall. The accommodating gap has an adhesive layer. The adhesive layer is used to bond the protruding rib and the side wall, or used to bond the protruding rib and the battery cell assembly. The adhesive layer is also used to seal the accommodating gap. The connection reliability and sealing performance between the cover and the side wall are improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, and in particular to a battery device, a power utilization device and an energy storage device. BACKGROUND

[0002] With the popularization of the concept of green development, new energy batteries are increasingly widely used 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 the field of energy storage and the like.

[0003] In the existing battery system, the performance requirements of battery devices are increasingly high. The energy density of a battery device is one of the indicators for measuring the performance of a battery device. Therefore, how to improve the energy density of a battery device is one of the research directions in the industry. SUMMARY

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

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

[0006] The first aspect of the embodiments of the present disclosure provides a battery device, comprising:

[0007] a battery box body comprising a cover body, a first wall and a plurality of side walls, the first wall and the cover body being arranged opposite to each other along a first direction, a first end of each of the side walls along the first direction being connected to the first wall, and a second end of each of the side walls along the first direction being connected to the cover body, the first wall, the cover body and the plurality of side walls enclosing a sealed accommodation cavity;

[0008] at least one battery monomer assembly accommodated in the accommodation cavity;

[0009] The cover body comprises a cover body main body and at least one protruding rib, the at least one protruding rib being connected to a side of the cover body main body facing the battery monomer assembly,

[0010] The protruding rib, at least one of the battery monomer assemblies and at least one of the side walls have an accommodation gap therebetween, the accommodation gap having an adhesive layer therebetween, the adhesive layer being used to bond the protruding rib and the side wall, or used to bond the protruding rib and the battery monomer assembly, and the adhesive layer also being used to seal the accommodation gap.

[0011] The battery device provided by the embodiments of the present disclosure has a closed containing cavity formed by the cover, the first wall and the plurality of side walls, so that a closed space is formed inside the battery box, the inside of the battery box is prevented from being disturbed by the external environment, a stable internal environment is provided for the components (for example, the battery monomer) located inside the battery box, the probability of damage or damage of the components (for example, the battery monomer) inside the battery box due to the influence of the external environment is reduced, and the reliability of the battery device is improved. The cover is provided to include a cover body and a protruding rib. Since there is a containing gap between the protruding rib, at least one battery monomer assembly and at least one side wall, and an adhesive layer is arranged in the containing gap, that is, the adhesive layer can be arranged between the protruding rib and the side wall, the adhesive area between the cover and the side wall is improved, the connection reliability between the cover and the side wall is improved, and the sealing performance between the cover and the side wall is also improved. In addition, since the cover and the plurality of side walls are bonded by the adhesive layer, compared with fastening connection by fasteners, the cover and the side wall provided by the embodiments of the present disclosure do not need to be additionally provided with flanges 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.

[0012] In some embodiments, the adhesive layer includes a first layer, and the first layer is located between the protruding rib and at least one of the side walls.

[0013] That is, the adhesive layer is provided with a first layer, and the first layer is located in the containing gap between the protruding rib and at least one of the side walls, and the protruding rib and at least one of the side walls are bonded by the first layer.

[0014] In some embodiments, the adhesive layer includes a second layer, and the second layer is located between the protruding rib and at least one of the battery monomer assemblies.

[0015] That is, the adhesive layer is provided with a second layer, and the second layer is located in the containing gap between the protruding rib and at least one of the battery monomer assemblies, and the protruding rib and at least one of the battery monomer assemblies are bonded by the second layer.

[0016] In some embodiments, the first layer is connected to the second layer.

[0017] Since the first layer is connected to the second layer, the integrity of the adhesive layer is improved, the adhesive area between the cover, the side wall and the battery monomer assembly is improved, the connection reliability between the cover, the side wall and the battery monomer assembly is improved, and the sealing performance between the cover, the side wall and the battery monomer assembly is also improved.

[0018] In some embodiments, the first layer is spaced apart from the second layer.

[0019] The first layer and the second layer are spaced apart, which is beneficial to reduce the use of the adhesive layer, reduce the cost, and facilitate the arrangement of the first layer and the second layer.

[0020] In some embodiments, the battery cell assembly includes a plurality of battery cells arranged along a second direction, the battery cell includes a housing defining an accommodation space by connected housing walls, a major surface housing wall of the housing walls is perpendicular to the second direction, wherein the major surface housing wall is the largest housing wall in area among the housing walls,

[0021] The plurality of side walls includes a first side wall and a second side wall oppositely arranged along the second direction, and a third side wall and a fourth side wall oppositely arranged along a third direction, the first direction, the second direction and the third direction intersect with each other,

[0022] 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 configured as the first wall, the first end plate and the second end plate are respectively configured as the first side wall and the second side wall, and the first side plate and the second side plate are respectively configured as the third side wall and the fourth side wall,

[0023] The at least one battery cell assembly is carried 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.

[0024] 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 jointly constitute the battery box, and the battery cell assembly is directly placed in the battery box jointly constituted by the first end plate, the second end plate, the first side plate and the second side plate, forming a simple battery device, which has simple structure, is easy to manufacture, and has low production cost. In addition, 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, so that the space in the battery box is less, the space utilization of the battery box is improved, and the energy density of the battery device is improved.

[0025] In some embodiments, the rib includes a first rib and a second rib, the accommodation gap includes a first gap and a second gap, the first gap is between the first rib and the first side plate, and the second gap is between the second rib and the second side plate.

[0026] By setting the first and second protrusions, the first protrusion has a first gap with the first side plate, and the second protrusion has a second gap with the second side plate, when assembling, the bottom of the first and second protrusions is attached to the top surface of the battery monomer assembly, and the adhesive is extruded into the first gap between the first protrusion and the first side plate and the second gap between the second protrusion and the second side plate, which is beneficial to improve the bonding area between the cover and the first and second side plates, and at the same time improve the connection reliability between the cover and the first and second side plates, and also improve the sealing performance between the cover and the first and second side plates.

[0027] In some embodiments, the cover further comprises at least one shielding flange connected to the cover body, a part of the shielding flange shields the accommodation gap in the first direction, and the other part is folded on the side of the side wall away from the accommodation cavity.

[0028] The shielding flange can shield the connection between the cover and the end surface of the side wall and the side surface of the side wall, which can reduce the possibility of water or condensed water entering the accommodation gap through the gap between the cover and the end surface of the side wall, and reduce the possibility of water or condensed water gathering at the glue interface, thereby reducing the possibility of water or condensed water entering the accommodation cavity.

[0029] In some embodiments, the protrusion includes a first protrusion and a second protrusion, the accommodation gap includes a first gap and a second gap, the first protrusion has the first gap with the first side plate, the second protrusion has the second gap with the second side plate, the shielding flange includes a first shielding flange and a second shielding flange,

[0030] A part of the first shielding flange shields the first gap in the first direction, and the other part is folded on the side of the first side plate away from the accommodation cavity in the third direction, the first shielding flange and the first protrusion form a first slot, and a part of the first side plate is inserted into the first slot;

[0031] A part of the second shielding flange shields the second gap in the first direction, and the other part is folded on the side of the second side plate away from the accommodation cavity in the third direction, the second shielding flange and the second protrusion form a second slot, and a part of the second side plate is inserted into the second slot.

[0032] Since the first shielding flange and the first protrusion form a first slot, a part of the first side plate is inserted into the first slot, and the second shielding flange and the second protrusion form a second slot, and a part of the second side plate is inserted into the second slot, which can play a positioning role between the cover and the first and second side plates, and is beneficial to improve the assembly efficiency and assembly precision of the battery box.

[0033] In some embodiments, the cover is bonded to the end face of the first end plate and the second end plate close to the cover side.

[0034] By bonding the cover to the end face of the first end plate and the second end plate close to the cover side, the connection structure is simple, and it is beneficial to reduce the use of fasteners and the like, thereby facilitating cost reduction. Since the first end plate and the second end plate are thick plate structural members with a certain thickness, it is beneficial to further improve the connection strength of the cover with the first end plate and / or the second end plate.

[0035] In some embodiments, at least one of the first end plate and the second end plate is configured to form a glue overflow groove on the end face close to the cover side in the first direction.

[0036] In this embodiment, by configuring at least one of the first end plate and the second end plate to form a glue overflow groove on the end face close to the cover side in the first direction, not only can the connection strength of the cover with 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 and the first end plate and / or the second end plate can be sealed, thereby improving the sealing performance of the battery box.

[0037] In some embodiments, at least one of the first side plate and the second side plate is configured to have a side plate main body portion and a side plate flange portion, the side plate main body portion is configured to be a plate shape extending in the first direction, the side plate flange portion is connected to one end of the side plate main body portion in the first direction, and the side plate flange portion is located on the side of the bottom plate away from the cover in the first direction and connected to the bottom plate.

[0038] Since the side plate flange portion is located on the side of the bottom plate away from the cover in the first direction and connected to the bottom plate, the side plate flange portion can provide support to the bottom plate, thereby improving the load bearing capacity of the bottom plate. Moreover, by configuring at least one of the first side plate and the second side plate to have a side plate main body portion and a side plate flange portion, the relative position of the first side plate and / or the second side plate can be fixed by abutting against the bottom plate during assembly of the first side plate and / or the second side plate with other box walls in the battery box, thereby reducing the assembly difficulty of the battery box.

[0039] In some embodiments, the bottom plate is built-in with the medium flow channel.

[0040] Since at least one of the first wall and the second wall is internally provided with the heat exchange medium flow channel, the heat exchange medium in the heat exchange medium flow channel can take away the heat generated by the battery cell assembly, reduce the temperature of the battery cell assembly, reduce the probability of thermal runaway of the battery cell assembly, and further reduce the probability of thermal runaway of the battery device. In addition, no additional heat exchange member needs to be provided to exchange heat for the battery cell assembly, which is conducive to improving the compactness and energy density of the battery device while reducing the manufacturing cost.

[0041] In some embodiments, the first end plate and the second end plate are connected to the bottom plate, and the end surface of each of the first end plate and the second end plate abuts against the surface of the bottom plate facing the cover body side in the first direction.

[0042] Since the relative positions of the first end plate and the second end plate to the bottom plate are fixed, the assembly difficulty of the battery box is reduced.

[0043] 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 portion and an insulation layer, the side plate main body portion is configured to be a plate shape extending in the first direction, the insulation layer is arranged between the side plate main body portion and the battery cell assembly, and the insulation layer is in contact with at least one of the battery cells.

[0044] By configuring at least one of the first side plate and the second side plate to include a side plate main body portion and an insulation layer, and by the insulation layer being in contact with at least one of the battery cells, the insulation performance between the box assembly and the battery cell is improved, thereby improving the reliability of the battery device.

[0045] In some embodiments, the battery device further comprises at least one binding member for binding the battery box, and the at least one binding member is located outside the accommodating cavity.

[0046] Since the binding member binds the battery box, the binding member can strengthen the strength of the battery box, and when the battery cell assembly is heated and expanded to press the battery box, the binding member can apply a binding force to the battery box, reduce the probability of the battery cell assembly releasing gas due to thermal runaway, causing the gas in the battery box to increase, causing part of the battery box to bulge or even break, thereby strengthening the strength of the battery box, reducing the probability or degree of deformation of the battery box, improving the external contour size precision of the battery device, and improving the appearance of the battery device. Moreover, the step of pressing the battery box to prevent the battery box from bulging and deforming during the inflation test stage in the battery device assembly production process can be cancelled, the production efficiency is improved, and the binding member is located outside the accommodating cavity, which can save the space in the battery box and improve the energy density of the battery device.

[0047] In some embodiments, the at least one binding member includes at least one first binding member, and the first binding member is located on the side of the cover relative to the battery monomer assembly along the first direction, and / or,

[0048] The at least one binding member includes at least one second binding member, and the second binding member is located on the side of the first wall relative to the battery monomer assembly along the first direction,

[0049] The binding member includes a binding member main body part and binding member connecting parts, the binding member connecting parts are located at both ends of the binding member main body part and connected with the binding member main body part, and the binding member connecting parts are connected with the side walls.

[0050] Since the binding member connecting parts are connected with the side walls, the side walls connected with the binding member connecting parts can clamp the battery monomer assembly under the pulling of the binding member, and the probability of the expansion of the battery monomer assembly due to the charging and / or discharging of the battery monomer assembly is reduced or the degree of the expansion of the battery monomer assembly due to the charging and / or discharging of the battery monomer assembly is reduced.

[0051] In some embodiments, the binding member main body part is in the shape of a strip, and the length direction of the binding member main body part is consistent with the second direction, and the two binding member connecting parts are connected with the first side wall and the second side wall, respectively.

[0052] The probability of the deformation of the large-surface shell wall of the battery monomer due to the charging and / or discharging of the battery monomer is relatively large, since the large-surface shell wall is perpendicular to the second direction, and the two binding member connecting parts are connected with the first side wall and the second side wall, respectively, the large-surface shell wall can have a relatively large clamping force along the second direction, thereby reducing the probability of the deformation of the large-surface shell wall due to the increase of the pressure in the battery monomer caused by the charging and / or discharging of the battery monomer or reducing the degree of the deformation of the large-surface shell wall, and further reducing the probability of the deformation of the battery device or reducing the degree of the deformation of the battery device.

[0053] A second aspect of the embodiments of the present disclosure provides a power utilization device, and the power utilization device includes the above-mentioned battery device.

[0054] 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.

[0055] A third aspect of the embodiments of the present disclosure provides an energy storage device, which includes the battery device described above.

[0056] 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

[0057] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0058] Figure 2 A structural schematic diagram of a battery device provided for some embodiments of the present application;

[0059] Figure 3 A perspective exploded schematic diagram of a battery device shown in Figure 2

[0060] Figure 4 An enlarged schematic diagram of an A1 region of Figure 2

[0061] Figure 5 A structural schematic diagram of a binding member provided for some embodiments of the present application;

[0062] Figure 6 A structural schematic diagram of a third side wall provided for some embodiments of the present application;

[0063] Figure 7 A structural schematic diagram of a first side wall provided for some embodiments of the present application;

[0064] Figure 8 An enlarged schematic diagram of a B1 region of Figure 7

[0065] Figure 9 A structural schematic diagram of a battery device provided for some other embodiments of the present application;

[0066] Figure 10 A C-C cross-sectional schematic diagram of Figure 9

[0067] An enlarged structural schematic diagram of a C1 region of Figure 11 Figure 10 An enlarged structural schematic diagram of a C2 region of

[0068] Figure 12 Figure 10 A D-D cross-sectional schematic diagram of

[0069] Figure 13 An enlarged structural schematic diagram of a D1 region of Figure 9

[0070] Figure 14 An enlarged structural schematic diagram of a D2 region of Figure 13

[0071] Figure 15 A perspective exploded schematic diagram of a battery cell provided for some embodiments of the present application; Figure 13

[0072] Figure 16 An enlarged structural schematic diagram of a D2 region of

[0073] Figure 17 ​​​​​​​​Structure diagram of a charging network in some embodiments of the present application;

[0074] Figure 18 Structure diagram of an energy storage system in some embodiments of the present application;

[0075] Figure 19 Structure diagram of an energy storage device in some embodiments of the present application.

[0076] Legend of reference signs

[0077] 10, battery cell assembly; 11, battery cell; 111, electrode terminal; 112, shell; 1121, large surface shell wall; 113, pressure relief mechanism; 114, electrode assembly; 115, accommodation space; 20, box assembly; 21, cover; 211, cover body; 212, protruding rib; 2121, first protruding rib; 2122, second protruding rib; 213, shielding flange; 2131, first shielding flange; 2132, second shielding flange; 22, first wall; 23, side wall; 231, first side wall; 2311, stepped portion; 2312, flange portion; 2313, first stepped surface; 2314, standing surface; 2315, second stepped surface; 2316, glue overflow groove; 232, second side wall; 233, third side wall; 2331, side plate body portion; 2332, side plate flange portion; 2333, insulating layer; 2334, protruding portion; 234, fourth side wall; 24, accommodation gap; 241, first gap; 242, second gap; 25, adhesive layer; 251, first layer; 30, binding member; 31, first binding member; 32, second binding member; 33, binding member body portion; 34, binding member connecting portion; 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

[0078] The embodiments of the technical solutions of the present application will be described in detail below in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill 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 the present application; the terms "include" and "have" and any variations thereof in the specification and the above drawings description of the present application are intended to cover non-exclusive inclusion.

[0080] In the description of the embodiments of the present application, the technical terms "first", "second", "third", "fourth" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified.

[0081] Reference to "embodiments" herein means that the specific features, structures or properties described in conjunction with the embodiments can 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 new technical solutions. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to 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 new technical solutions.

[0082] In the description of the embodiments of the present application, the term "and / or" is only used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0083] In the description of the embodiments of the present application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed in a particular orientation, be operated or used, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0084] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0085] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the technical term "contact" should be interpreted broadly, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force or contact between two objects in contact with interaction force.

[0086] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the technical term "projection" refers to an orthographic projection of parallel projection lines perpendicular to the projection plane.

[0087] In the following, the present application will be described in detail.

[0088] With the popularization and popularization of the concept of green development, new energy batteries are more and more widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used, in addition, battery devices are also more and more widely used in energy storage fields and the like.

[0089] In the related art, the battery device includes a battery box body and a battery monomer assembly located in the box body. The battery box body includes an upper cover and a box body. The periphery of the upper cover is provided with an upper cover flange face with a certain width. The width of the upper cover flange face includes the width required for bolt locking and the width required for sealing. The upper cover flange face is provided with a bolt mounting hole. The box body is also designed with a box flange face matched with the upper cover flange face. The box flange face is provided with a threaded hole corresponding to the bolt mounting hole. After the upper cover is installed, the upper cover flange face is attached to the box flange face in the vertical direction, and the sealing pad is designed inside the bolt mounting hole. The sealing connection between the upper cover and the box body is realized by pressing the upper cover with the bolt and extruding the sealing pad with the upper cover. The setting of the upper cover flange face and the box flange face occupies a large space, which reduces the energy density of the battery device. In addition, the sealing scheme realized by the sealing pad requires the installation of dense bolts to ensure that the sealing pad reaches the designed compression amount at all positions, which requires more fasteners, resulting in high cost and low assembly efficiency. Since the upper cover flange face is in a horizontal state and the bolt is installed vertically, condensate water and the like are easy to accumulate at the top of the upper cover flange face and the bolt position, causing the local position to be in a water-soaked state for a long time, which may cause corrosion or sealing failure. Through research, the cover body and the plurality of side walls can be bonded by an adhesive, thereby saving the occupied space of the upper cover flange face and the box flange face, improving the energy density of the battery device, and further improving the sealing performance between the cover body and the side wall by setting the cover body to include a cover body and a protruding rib, and extruding the adhesive between the protruding rib and the side wall. Thus, the connection reliability between the cover body and the side wall is improved, and the sealing performance between the cover body and the side wall is also improved.

[0090] Based on the design concept, the battery device provided by the embodiment of the present application comprises a battery box and at least one battery monomer assembly. The battery box comprises a cover, a first wall and a plurality of side walls. The first wall is arranged opposite to the cover along a first direction. The first end of each side wall along the first direction is connected to the first wall. The second end of each side wall along the first direction is connected to the cover. The first wall, the cover and the plurality of side walls enclose a sealed containing cavity. The at least one battery monomer assembly is contained in the containing cavity. The cover comprises a cover body and at least one protruding rib. The at least one protruding rib is connected to the side of the cover body facing the battery monomer assembly. There is a containing gap between the protruding rib, the at least one battery monomer assembly and the at least one side wall. The containing gap has an adhesive layer. The adhesive layer is used to bond the protruding rib and the side wall, or to bond the protruding rib and the battery monomer assembly. The adhesive layer is also used to seal the containing gap.

[0091] The battery device provided by the embodiment of the present application can form a sealed containing cavity due to the cover, the first wall and the plurality of side walls. Therefore, a closed space can be formed inside the battery box. The inside of the battery box can prevent the interference of the external environment. A stable internal environment is provided for the components (such as battery monomers) located inside the battery box. Thus, the probability of damage or damage of the components (such as battery monomers) inside the battery box due to the influence of the external environment is reduced. The reliability of the battery device is improved. The cover is provided to comprise a cover body and a protruding rib. There is a containing gap between the protruding rib, the at least one battery monomer assembly and the at least one side wall. An adhesive layer is arranged in the containing gap. That is, the adhesive layer can be arranged between the protruding rib and the side wall. This is conducive to improving the bonding area between the cover and the side wall. While improving the connection reliability between the cover and the side wall, the sealing performance between the cover and the side wall is also improved. In addition, the cover and the side wall provided by the embodiment of the present application are bonded by the adhesive layer. Compared with fastening connection by fasteners, the cover and the side wall do not need to be additionally provided with flange surfaces for fastening connection. This is conducive to reducing the structural size of the battery box. Therefore, the space utilization of the battery box is improved. Thus, the energy density of the battery device is improved.

[0092] The battery device provided by the embodiment of the present application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited thereto.

[0093] The embodiment of the present application also provides an energy storage device comprising the above-mentioned battery device. The energy storage device can comprise an energy storage container, an energy storage cabinet and the like.

[0094] The application further provides a power utilization device comprising the battery device. The power utilization device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0095] The battery device 100 is described below in combination with the accompanying drawings.

[0096] Please refer to Figure 17 and Figure 19 , Figure 17 a structural schematic diagram of a charging network provided by some embodiments of the application, Figure 19 a structural schematic diagram of an energy storage device provided by some embodiments of the application. The application provides a charging network 3000 comprising a charging pile 500 for charging a power utilization device. The charging network 3000 can further comprise an energy storage device 400 electrically connected to the charging pile 500, and the energy storage device 400 is configured to provide electric energy to the charging pile 500.

[0097] It should be noted that the charging pile 500 and the battery cell in the energy storage device 400 are electrically connected through a cable, and the battery cell can provide the electric energy stored therein to the charging pile 500. The charging pile 500 has a connector that can be connected to the power utilization device, so as to charge the power utilization device. The charging network 3000 applies the energy storage device 400, which can effectively improve the safety of the charging network 3000 and also helps to improve the flexibility of the charging network 3000 when deployed.

[0098] In one charging network 3000, the charging pile 500 can be one, and the energy storage device 400 provides electric energy to one charging pile 500. The charging pile 500 can also be multiple, and the energy storage device 400 provides electric energy to multiple charging piles 500.

[0099] As an example, as shown in Figure 17 , the charging network 3000 comprises one energy storage device 400 and two charging piles 500, and one energy storage device 400 provides electric energy to two charging piles 500.

[0100] The energy storage device 400 can comprise a battery device 100, and the battery device 100 is electrically connected to the charging pile 500, so as to provide electric energy to the charging pile 500.

[0101] Please refer to Figure 18 and Figure 19 , Figure 18The structural diagram of the energy storage system is provided for some embodiments of the present application. The energy storage system 4000 is provided by the embodiments of the present application. The energy storage system 4000 comprises an energy storage converter 600, which can be electrically connected to a power generation device 5000 to convert the power provided by the power generation device 5000. The energy storage system 4000 can further comprise an energy storage device 400, which is electrically connected to the energy storage converter 600, and the energy storage converter 600 guides the power generated by the power generation device 5000 to the energy storage device 400 after power conversion for storage.

[0102] 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 power, and the power generation device 5000 is used to store the power generated by the power generation device 5000 to the energy storage device 400 through the power conversion device. The energy storage system 4000 applies the energy storage device 400, which can effectively improve the operation safety of the energy storage system 4000. In specific implementation, the power generation equipment can be a solar panel, a hydroelectric power generation equipment, a thermal power generation equipment, etc. The specific type of the power generation equipment is not limited in the present application.

[0103] As an example, as shown in Figure 18 The energy storage system 4000 comprises the energy storage device 400 and the energy storage converter 600, and two power generation devices 5000 respectively transmit the generated power to the energy storage converter 600, and the energy storage converter 600 guides the power to the energy storage device 400 for storage.

[0104] Please refer to Figure 19 The energy storage device 400 comprises an energy storage box 410, and the battery device 100 is arranged in the energy storage box 410.

[0105] As an example, the energy storage device 400 can be an energy storage container, an energy storage cabinet, etc.

[0106] As an example, the energy storage device 400 can be used for an energy storage power station, a wind power generation system, a solar power generation system, a mobile power system or a temporary power supply system, etc. The energy storage power station can store the power at the low electricity consumption valley, and provide the power for the related users or power consumption equipment at the electricity consumption peak. The wind turbine generator set of the wind power generation system collects the wind energy and converts it into the power, which is stored by the energy storage device 400. The solar power generation system can convert the solar energy into the power, which is stored by the energy storage device 400 and supplied to the users in time. The mobile power system can supply the power to the related power consumption equipment in the places where the power grid power supply system cannot reach, such as remote mountainous areas, remote wild areas, etc. The temporary power supply system can supply the power to the users in the case of insufficient power supply.

[0107] Figure 1 The structural diagram of the vehicle is provided for some embodiments of the present application.

[0108] The interior of the vehicle 1000 can be provided with a controller 200, a motor 300, and a battery apparatus 100, the controller 200 being configured to control the battery apparatus 100 to supply power to the motor 300. For example, the battery apparatus 100 can be provided at the bottom, front, or rear of the vehicle 1000. The battery apparatus 100 can be used to supply power to the vehicle 1000, for example, the battery apparatus 100 can be used as a power source for the operation of the vehicle 1000, for example, to supply power to the circuitry of the vehicle 1000, for example, to supply power for the operation of the vehicle 1000, such as for the starting, navigation, and operation of the vehicle 1000. In another embodiment of the present disclosure, the battery apparatus 100 can not only be used as a power source for the operation of the vehicle 1000, but also be used as a power source for the driving of the vehicle 1000, to replace or partially replace fuel or natural gas as a driving power source for the vehicle 1000.

[0109] In some embodiments of the present application, the battery apparatus 100 can not only be used as a power source for the operation of the vehicle 1000, but also be used as a power source for the driving of the vehicle 1000, to replace or partially replace fuel or natural gas as a driving power source for the vehicle 1000.

[0110] Figure 2 A structural schematic diagram of a battery apparatus according to some embodiments of the present application is provided; the battery apparatus 100 referred to in the embodiments of the present application can include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 can include a plurality of battery cells 11 connected in series, in parallel, or in a mixed connection through a busbar component.

[0111] In some embodiments, the battery cell assembly 10 is generally formed by arranging a plurality of battery cells 11; as an example, the battery cell assembly 10 can be a battery module formed by arranging and fixing a plurality of battery cells 11 into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 11 with a cable tie.

[0112] In some embodiments, the battery apparatus 100 can be a battery pack including a battery box and one or more battery cell assemblies 10, the battery cell assemblies 10 being accommodated in the battery box.

[0113] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be accommodated in the battery box by fixing the battery module in the battery box.

[0114] As an example, the battery cell assembly 10 can also be housed in the battery case by directly fixing a plurality of battery cells 11 to the battery case.

[0115] In the embodiments of the present application, the battery cell 11 can be a secondary battery, which refers to a battery cell 11 that can be activated by charging after discharging.

[0116] 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-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0117] The battery cell 11 generally includes an electrode assembly 114. The electrode assembly 114 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery cell 11, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0118] In some embodiments, the positive electrode can be a positive electrode tab, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0119] In some embodiments, the negative electrode can be a negative electrode tab, which can include a negative electrode current collector.

[0120] In some embodiments, the electrode assembly 114 further includes a separator disposed between the positive electrode and the negative electrode.

[0121] In some embodiments, the separator is a separator film. The embodiments of the present application do not have specific limitations on the type of separator film, and any known porous structure separator film with good chemical stability and mechanical stability can be selected.

[0122] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0123] In some embodiments, the battery cell 11 further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The embodiments of the present application do not have specific limitations on the type of electrolyte, which can be selected as needed. The electrolyte can be liquid, gel, or solid.

[0124] In some embodiments, the electrode assembly 114 is a jelly-roll structure. The positive electrode tab and the negative electrode tab are wound into a jelly-roll structure.

[0125] In some embodiments, the electrode assembly 114 is a stacked structure.

[0126] As an example, a plurality of positive electrode tabs and a plurality of negative electrode tabs can be alternately stacked.

[0127] As an example, a plurality of positive electrode tabs can be provided, and the negative electrode tab is folded to form a plurality of folded segments which are stacked.

[0128] As an example, both the positive electrode tab and the negative electrode tab are folded to form a plurality of folded segments which are stacked.

[0129] As an example, a plurality of isolation pieces can be provided, and each isolation piece is provided between any adjacent positive electrode tab or negative electrode tab.

[0130] As an example, a plurality of isolation pieces can be provided, and each isolation piece is provided between any adjacent positive electrode tab or negative electrode tab.

[0131] In some embodiments, the electrode assembly 114 is provided with a tab, which can guide current out of the electrode assembly 114. The tab includes a positive tab and a negative tab.

[0132] In some embodiments, the battery cell 11 can include a shell. The shell is used to encapsulate the electrode assembly 114 and other components such as electrolyte. The shell can 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, etc.

[0133] As an example, the battery cell 11 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc., and the present application is not particularly limited.

[0134] In some embodiments, the shell is provided with an electrode terminal 111, and the electrode terminal 111 partially penetrates the shell and is electrically connected to the electrode assembly 114 through the tab.

[0135] In some specific embodiments, the electrode terminal 111 is made of a conductive metal material, such as copper or aluminum.

[0136] In some embodiments, the shell is provided with a pressure relief mechanism 113. The pressure relief mechanism 113 is used to release the internal pressure of the battery cell 11.

[0137] In the following, the specific embodiments of the present application are described in detail. Figures 2 to 16 The specific embodiments of the present application are described in detail.

[0138] In the description of the embodiments of the present application, the direction in which the arrow X is located is referred to as the "first direction", the direction in which the arrow Y is located is referred to as the "second direction", and the direction in which the arrow Z is located is referred to as the "third direction". The first direction X, the second direction Y and the third direction Z are perpendicular to 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.

[0139] Referring to Figures 2 to 16 The battery device 100 provided by the embodiments of the present application includes a battery box and at least one battery monomer assembly 10. The battery box includes a cover 21, a first wall 22 and a plurality of side walls 23. The first wall 22 is arranged opposite to the cover 21 along the first direction. The first ends of the side walls 23 along the first direction are connected to the first wall 22. The second ends of the side walls 23 along the first direction are connected to the cover 21. The first wall 22, the cover 21 and the plurality of side walls 23 enclose a sealed containing cavity. The at least one battery monomer assembly 10 is contained in the containing cavity. The cover 21 includes a cover body 211 and at least one protruding rib 212. The protruding rib 212 is connected to the side of the cover body 211 facing the battery monomer assembly 10. There is a containing gap 24 between the protruding rib 212, the at least one battery monomer assembly 10 and the at least one side wall 23. The containing gap 24 has an adhesive layer 25. The adhesive layer 25 is used to bond the protruding rib 212 and the side wall 23, or to bond the protruding rib 212 and the battery monomer assembly 10. The adhesive layer 25 is also used to seal the containing gap 24.

[0140] For example, the protruding rib 212 is located on the inner side of the side wall 23.

[0141] For example, the adhesive layer 25 includes a first layer 251. The first layer 251 is located between the protruding rib 212 and the at least one side wall 23.

[0142] That is, the adhesive layer 25 is provided with the first layer 251. The first layer 251 is located in the containing gap 24 between the protruding rib 212 and the at least one side wall 23. The protruding rib 212 and the at least one side wall 23 are bonded by the first layer 251. In this way, the contact area between the cover 21 and the side wall 23 is increased.

[0143] In some embodiments, the adhesive layer 25 includes a second layer. The second layer is located between the protruding rib 212 and the at least one battery monomer assembly 10.

[0144] That is, the adhesive layer 25 is provided with the second layer, which is arranged in the accommodation gap between the protrusion 212 and the at least one battery cell assembly 10, and the protrusion 212 and the at least one battery cell assembly 10 are adhered through the second layer. The cover 21 and the battery cell assembly 10 are adhered through the second layer, which improves the integrity of the battery device, and further improves the overall structural strength and reliability of the battery device.

[0145] The surface of the protrusion 212 facing the cover 21 in the first direction is adhered to the surface of the battery cell assembly 10 facing the cover 21 in the first direction through the second layer.

[0146] In some embodiments, the first layer 251 is connected to the second layer.

[0147] Since the first layer 251 is connected to the second layer, the integrity of the adhesive layer 25 is improved, thereby increasing the adhesive area between the cover 21 and the side wall and the battery cell assembly 10, and improving the sealing performance between the cover 21 and the side wall 23 and the battery cell assembly 10 while improving the connection reliability between the cover 21 and the side wall and the battery cell assembly 10.

[0148] In some embodiments, the first layer 251 is spaced apart from the second layer.

[0149] Since the first layer 251 is spaced apart from the second layer, the use of the adhesive layer 25 is reduced, the cost is reduced, and the first layer 251 and the second layer are facilitated to be arranged.

[0150] Optionally, the number of battery cell assemblies 10 can be one, two, three, or more.

[0151] In some embodiments, as shown in Figure 3 , the plurality of battery cell assemblies 10 can be arranged in the second direction and / or the third direction.

[0152] In some embodiments, the plurality of side walls 23 includes two side walls 23 opposite in the second direction (for example, the first side wall 231 and the second side wall 232 as shown in Figure 3 ) and two side walls 23 opposite in the third direction (for example, the third side wall 233 and the fourth side wall 234 as shown in Figure 3 ).

[0153] Hereinafter, the side wall 23 is taken as the first side wall 231 for example.

[0154] Optionally, the first end and the first wall 22 can be directly connected or indirectly connected, for example, the first end and the first wall 22 can be adhered, or can be connected through bolts, iron, or other external connecting members.

[0155] Optionally, the first end of the side wall 23 can abut against a side of the first wall 22 facing the battery cell 11 in the first direction; or an end edge of the first wall 22 can abut against the first end of the side wall 23, for example, in the orientation shown in Figure 2 Optionally, the first end of the side wall 23 can abut against a side of the first wall 22 facing the battery cell 11 in the first direction; or an end edge of the first wall 22 can abut against the first end of the side wall 23, for example, in the orientation shown in

[0156] Optionally, the second end can be directly or indirectly connected to the cover 21, for example, the second end can be bonded to the cover 21, or can be connected to the cover 21 through a bolt, iron, or other external connecting member.

[0157] Optionally, the second end of the side wall 23 can abut against a side of the cover 21 facing the battery cell 11 in the first direction; or an end edge of the cover 21 can abut against the second end of the side wall 23, for example, in the orientation shown in Figure 2 Optionally, the second end of the side wall 23 can abut against a side of the cover 21 facing the battery cell 11 in the first direction; or an end edge of the cover 21 can abut against the second end of the side wall 23, for example, in the orientation shown in

[0158] In some embodiments, the accommodation cavity is not in communication with the outside.

[0159] In some embodiments, the cover 21 is configured as an insulating cover.

[0160] Optionally, the outer surface of the cover 21 is insulated, or the entire material of the cover 21 is an insulating material.

[0161] In some embodiments, the cover 21 is made of a resin material. Alternatively, the cover 21 is made of a fiber-reinforced resin composite material. Alternatively, the cover 21 is made of a metal material with an insulating layer 2333.

[0162] Optionally, as shown in Figures 11 to 15 Optionally, the connection between the cover 21 and the plurality of side walls 23 is filled with an adhesive layer 25 composed of an adhesive.

[0163] Here, the provision of the adhesive layer 25 is conducive to improving the connection reliability and sealing between the cover 21 and the plurality of side walls 23.

[0164] Optionally, the connection between the first wall 22 and the plurality of side walls 23 is filled with an adhesive layer 25.

[0165] Here, the provision of the adhesive layer 25 is conducive to improving the connection reliability and sealing between the first wall 22 and the plurality of side walls 23.

[0166] Optionally, the connection between the plurality of side walls 23 is filled with an adhesive layer 25.

[0167] Here, the provision of the adhesive layer 25 is conducive to improving the connection reliability and sealing between the plurality of side walls 23.

[0168] Exemplarily, the at least one side wall 23 is higher than the top wall of the battery monomer assembly 10. In this way, the protection of the battery monomer assembly 10 by the battery box is improved, and the adhesive can be coated in the area close to the side wall 23 of the top wall of the battery monomer assembly 10.

[0169] The number of the convex ribs 212 can be one or multiple.

[0170] The multiple in the embodiments of the present application refers to two or more.

[0171] In some embodiments, referring to Figures 10 to 12 The at least one convex rib 212 is connected to the side of the cover body 211 facing the battery monomer assembly 10, that is, in the first direction, the convex rib 212 is located between the cover body 211 and the battery monomer assembly 10.

[0172] Here, the convex rib 212 and the cover body 211 can be an integral structure, which is beneficial to reduce the number of parts and improve the assembly efficiency of the battery device 100. Of course, the convex rib 212 and the cover body 211 can also be a split structure, which is beneficial to the molding of the cover 21.

[0173] The convex rib 212 corresponds to the side wall 23, that is, the extension direction of the convex rib 212 is the same as the extension direction of the side wall 23 corresponding to the convex rib 212, so as to form the accommodation gap 24 between the convex rib 212 and the side wall 23 corresponding to the convex rib 212.

[0174] Exemplarily, part of the side wall 23 can be provided with the convex rib 212, or all of the side wall 23 can be provided with the convex rib 212.

[0175] Exemplarily, the convex rib 212 can extend in the second direction, or extend in the third direction, or part of the convex rib 212 extends in the second direction, and the other part of the convex rib 212 extends in the third direction.

[0176] The surface of the convex rib 212 facing the battery monomer assembly 10 in the first direction is adhered to the surface of the battery monomer assembly 10 facing the cover 21 in the first direction through the adhesive layer 25 (the second layer), that is, the convex rib 212 is adhered to the top wall of the battery monomer assembly 10 through the adhesive layer 25 (the second layer), so that the cover 21 and the battery monomer assembly 10 can be connected as a whole, which improves the connection reliability of the cover 21, and also improves the overall structural strength and stability of the battery device 100.

[0177] Exemplarily, before assembling the cover 21, an adhesive can be applied at the junction of the top wall of the battery monomer assembly 10 and the side wall 23, and then the surface of the convex rib 212 along the first direction towards the battery monomer assembly 10 is adhered to the surface of the battery monomer assembly 10 along the first direction towards the cover 21 through the adhesive layer 25, so that the adhesive layer 25 is extruded into the accommodation gap 24 between the convex rib 212 and the side wall 23, the convex rib 212 and the side wall 23 are in surface-to-surface contact, which is conducive to increasing the bonding area between the cover 21 and the side wall 23, and at the same time, the connection reliability between the cover 21 and the side wall 23 is improved, and the possibility of liquid entering the accommodation cavity through the gap between the cover 21 and the side wall 23 is reduced, thereby improving the sealing performance between the cover 21 and the side wall 23.

[0178] The battery device 100 provided by the embodiments of the present disclosure has a closed accommodation cavity enclosed by the cover 21, the first wall 22 and the plurality of side walls 23, so that a closed space is formed inside the battery box, the inside of the battery box can prevent external environmental interference, and a stable internal environment is provided for the components (such as the battery monomer 11) located inside the battery box, thereby reducing the probability of damage or damage of the components (such as the battery monomer 11) inside the battery box due to the influence of the external environment, and improving the reliability of the battery device 100. The cover 21 is provided to include the cover body 211 and the convex rib 212, and the convex rib 212, the at least one battery monomer assembly 10 and the at least one side wall 23 have the accommodation gap 24 therebetween, and the adhesive layer 25 is arranged in the accommodation gap 24, so that the adhesive layer 25 can be arranged between the convex rib 212 and the side wall 23, which is conducive to increasing the bonding area between the cover 21 and the side wall 23, and at the same time, the connection reliability between the cover 21 and the side wall 23 is improved, and the sealing performance between the cover 21 and the side wall 23 is also improved. Since the cover 21 and the plurality of side walls 23 are adhered through the adhesive layer 25, compared with fastening connection through fasteners, the cover 21 and the side wall 23 provided by the embodiments of the present disclosure do not need to be additionally provided with a flange surface for fastening connection, which is conducive 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.

[0179] In some embodiments, as shown in Figure 2 and Figure 3 The battery monomer assembly 10 includes a plurality of battery monomers 11 arranged along the second direction, and the battery monomer 11 includes an outer shell 112 (see Figure 16The housing 112 defines a receiving space 115 by the associated housing walls, and a large-area housing wall 1121 of the housing walls is perpendicular to the second direction, where the large-area housing wall 1121 is the housing wall with the largest area among the housing walls. The plurality of side walls 23 includes a first side wall 231 and a second side wall 232 arranged opposite to each other along the second direction, and a third side wall 233 and a fourth side wall 234 arranged opposite to each other along a third direction, the first direction, the second direction, and the third direction intersecting with 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 configured as the first wall 22. The first end plate and the second end plate are configured as the first side wall 231 and the second side wall 232, respectively. The first side plate and the second side plate are configured as the third side wall 233 and the fourth side wall 234, respectively. The at least one battery cell assembly 10 is carried on the bottom plate. The first end plate, the second end plate, the first side plate, and the second side plate are all in contact with the at least one battery cell 11.

[0180] In one specific embodiment, as shown in Figure 3 and Figure 16 , the battery cells 11 in the same battery cell assembly 10 are arranged in a large-area housing wall 1121 opposite manner, for example, the battery cells 11 in the same battery cell assembly 10 are arranged along the second direction, and the large-area housing wall 1121 of each battery cell 11 in the same battery cell assembly 10 is substantially perpendicular to the second direction. The large-area 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 housing 112 of the battery cell 11.

[0181] In some embodiments, as shown in Figure 16 , the battery cell 11 includes a housing 112 and an electrode assembly 114 located in the housing 112.

[0182] In some embodiments, the electrode assembly 114 is a jelly-roll structure, and the positive electrode, the negative electrode, and the separator in the electrode assembly 114 are arranged along the second direction.

[0183] In some embodiments, the electrode assembly 114 is a jelly-roll structure, and the positive electrode, the negative electrode, and the separator in the electrode assembly 114 are arranged along the second direction.

[0184] In some embodiments, the expansion degree of the battery cell 11 along the arrangement direction of the positive electrode, the negative electrode, and the separator is greater than the expansion degree of the battery cell 11 along the direction intersecting with the arrangement direction of the positive electrode, the negative electrode, and the separator. For example, the expansion degree of the battery cell 11 along the second direction is greater than the expansion degree of the battery cell 11 along the first direction, and the expansion degree of the battery cell 11 along the second direction is greater than the expansion degree of the battery cell 11 along the third direction.

[0185] In some embodiments, one side of the first end plate and / or the second end plate has a reinforcing rib along the second direction, thereby being able to strengthen the strength of the first end plate and / or the second end plate.

[0186] In some embodiments, the side of the first end plate and / or the second end plate away from the accommodation cavity has a reinforcing rib along the second direction, thereby not only being able to strengthen the strength of the first end plate and / or the second end plate, but also being able to not occupy the space inside the battery box.

[0187] In some embodiments, the number of reinforcing ribs is multiple, and the multiple reinforcing ribs are arranged in a cross manner.

[0188] In some embodiments, the first end plate and / or the second end plate is made of metal material.

[0189] In some embodiments, the first end plate and / or the second end plate can be equivalent to an expansion beam, by arranging the battery cells 11 in the same battery cell assembly 10 at both ends along the arrangement direction between the first end plate and the second end plate, for resisting the expansion force of the battery cells 11 along the second direction.

[0190] The probability of the large-face shell wall 1121 of the battery cell 11 deforming due to the charging and / or discharging of the battery cell 11 is relatively large, therefore, by arranging the first side wall 231 and the second side wall 232 arranged opposite along the second direction as the first end plate and the second end plate respectively, and arranging the large-face shell wall 1121 perpendicular to the second direction, thereby 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, and the probability or degree of deformation of the large-face shell wall 1121 due to the increase of the pressure in the battery cell 11 caused by the charging and / or discharging of the battery cell 11 can be reduced, and further the probability or degree of deformation of the battery device 100 can be reduced.

[0191] Since the bottom plate is configured as the first wall 22, the first end plate and the second end plate are respectively configured as the first side wall 231 and the second side wall 232, and the first side plate and the second side plate are respectively configured as the third side wall 233 and the fourth side wall 234, that is, the side wall 23 and the first wall 22 of the battery box are both plate-shaped structures, which is simple, forming a kind of simple battery box.

[0192] Since the probability of the large-face shell wall 1121 of the battery cell 11 deforming due to the charging and / or discharging of the battery cell 11 is relatively large, therefore, by arranging the first end plate and the second end plate as a thick plate structure with a certain thickness, so that 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. The third side wall 233 and the fourth side wall 234 are arranged as a thin plate structure, which is beneficial to further improve the energy density of the battery device 100.

[0193] In one specific embodiment, the battery device 100 comprises a plurality of battery cell assemblies 10 arranged along a third direction, along the third direction, the battery cell assembly 10 closest to the third side wall 233 is in contact with the third side wall 233, along the third direction, the battery cell assembly 10 closest to the fourth side wall 234 is in contact with the fourth side wall 234, each battery cell assembly 10 is in contact with the first side wall 231, and each battery cell assembly 10 is in contact with the second side wall 232.

[0194] Since the plurality of battery cell assemblies 10 are carried on the bottom plate, and the first end plate, the second end plate, the first side plate, and the second side plate are 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 box can be in direct contact with the battery cell assembly 10, so as to further reduce the voids in the battery box, and further improve the energy density of the battery device 100.

[0195] In this embodiment, by forming the battery box with the cover 21, the bottom plate, the first end plate, the second end plate, the first side plate, and the second side plate, and placing the battery cell assembly 10 directly in the battery box formed by the first end plate, the second end plate, the first side plate, and the second side plate, a simple battery device 100 is formed, which has a simple structure, is easy to manufacture, and has low production cost. Moreover, the first end plate, the second end plate, the first side plate, and the second side plate are in contact with at least one battery cell assembly 10, so as to reduce the voids in the battery box, improve the space utilization of the battery box, and improve the energy density of the battery device 100.

[0196] In some embodiments, referring to Figures 9 to 12 , the protruding ribs 212 comprise first protruding ribs 2121 and second protruding ribs 2122, and the accommodation gaps 24 comprise first gaps 241 and second gaps 242, the first gaps 241 are between the first protruding ribs 2121 and the first side plate, and the second gaps 242 are between the second protruding ribs 2122 and the second side plate.

[0197] The first gaps 241 between the first protruding ribs 2121 and the first side plate mean that the first gaps 241 are defined between the surfaces of the first protruding ribs 2121 and the first side plate opposite to each other, i.e., the surface of the first side plate facing the accommodation cavity and the surface of the first protruding ribs 2121 facing the first side plate have the first gaps 241 therebetween.

[0198] The second gaps 242 between the second protruding ribs 2122 and the second side plate mean that the second gaps 242 are defined between the surfaces of the second protruding ribs 2122 and the second side plate opposite to each other, i.e., the surface of the second side plate facing the accommodation cavity and the surface of the second protruding ribs 2122 facing the second side plate have the second gaps 242 therebetween.

[0199] In the embodiment in which the cover 21 and the plurality of side walls 23 are connected by the adhesive layer 25 (the first layer 251), the end surface of the side wall 23 towards the cover 21 is connected by the adhesive, and because the first side plate and the second side plate are provided as a thin plate structure, the end surface area of the first side plate and the second side plate towards the cover 21 is relatively small, resulting in a relatively small adhesive area between the side wall 23 and the cover 21, and by providing the first protruding rib 2121 and the second protruding rib 2122, the first protruding rib 2121 and the first side plate have a first gap 241, and the second protruding rib 2122 and the second side plate have a second gap 242, when assembling, the bottom of the first protruding rib 2121 and the second protruding rib 2122 is in contact with the top surface of the battery monomer assembly 10, and the adhesive layer 25 is pressed into the first gap 241 between the first protruding rib 2121 and the first side plate and the second gap 242 between the second protruding rib 2122 and the second side plate, which is beneficial to improve the adhesive area between the cover 21 and the first side plate and the second side plate, and at the same time improves the connection reliability between the cover 21 and the first side plate and the second side plate, and also improves the sealing performance between the cover 21 and the first side plate and the second side plate.

[0200] In some embodiments, referring to Figures 9 to 12 , the cover 21 further comprises at least one shielding flange 213 connected to the cover body 211, part of the shielding flange 213 shields the accommodation gap 24 in the first direction, and the other part is folded on the side of the side wall 23 away from the accommodation cavity.

[0201] Here, the shielding flange 213 and the cover body 211 can be an integral structure, which is beneficial to reduce parts, thereby improving the assembly efficiency of the battery device 100. Of course, the shielding flange 213 and the cover body 211 can also be a split structure, which is beneficial to the molding of the cover 21.

[0202] The number of shielding flanges 213 can be one or more.

[0203] Exemplarily, the cover body 211 can be circumferentially provided with shielding flanges 213, or can be provided with shielding flanges 213 in part of the circumferential direction.

[0204] Exemplarily, the cover body 211 can be provided with shielding flanges 213 on the side corresponding to the protruding ribs 212, that is, the protruding ribs 212 and the shielding flanges 213 correspond one by one. Of course, in other embodiments, the side of the cover body 211 without the protruding ribs 212 can also be provided with shielding flanges 213.

[0205] The part of the shielding flange 213 shields the accommodating gap 24 in the first direction, and the other part of the shielding flange 213 is folded on the side of the side wall 23 away from the accommodating cavity, that is, one part of the shielding flange 213 is above the accommodating gap 24, and the other part of the shielding flange 213 is folded on the side of the side wall 23, so that the shielding flange 213 can shield the connection between the cover 21 and the end surface of the side wall 23 and the side of the side wall 23.

[0206] In this embodiment, by arranging the cover 21 to include the cover body 211 and the shielding flange 213, the shielding flange 213 can shield the connection between the cover 21 and the end surface of the side wall 23 and the side of the side wall 23, which can reduce the possibility of water droplets or condensed water entering the accommodating gap 24 through the gap between the cover 21 and the end surface of the side wall 23, and reduce the possibility of water droplets or condensed water gathering at the glue interface, thereby reducing the possibility of water droplets or condensed water entering the accommodating cavity.

[0207] It should be noted that the size of the shielding flange 213 in the first direction is not limited here.

[0208] Exemplarily, the size of the shielding flange 213 in the first direction is greater than the size of the rib 212 in the first direction, so as to further facilitate reducing the possibility of water droplets or condensed water entering the accommodating gap 24 through the gap between the cover 21 and the end surface of the side wall 23, and reducing the possibility of water droplets or condensed water gathering at the glue interface.

[0209] Of course, in other embodiments, the size of the shielding flange 213 in the first direction can also be less than or equal to the size of the rib 212 in the first direction.

[0210] In some embodiments, please continue to refer to Figures 9 to 12 The shielding flange 213 includes a first shielding flange 2131 and a second shielding flange 2132. One part of the first shielding flange 2131 shields the first gap 241 in the first direction, and the other part of the first shielding flange 2131 is folded on the side of the first side plate away from the accommodating cavity in the third direction. The first shielding flange 2131 and the first rib 2121 form a first insertion slot, and a part of the first side plate is inserted into the first insertion slot. One part of the second shielding flange 2132 shields the second gap 242 in the first direction, and the other part of the second shielding flange 2132 is folded on the side of the second side plate away from the accommodating cavity in the third direction. The second shielding flange 2132 and the second rib 2122 form a second insertion slot, and a part of the second side plate is inserted into the second insertion slot.

[0211] The first shielding flange 2131 is closer to the edge of the cover 21 relative to 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 insertion slot.

[0212] The second shielding flange 2132 is closer to the edge of the cover body 21 relative to the second protruding rib 2122, that is, the second shielding flange 2132 is arranged outside the second protruding rib 2122, so that the second shielding flange 2132 and the second protruding rib 2122 form a second insertion slot.

[0213] Since the first shielding flange 2131 and the first protruding rib 2121 form a first insertion slot, a part of the first side plate is inserted into the first insertion slot, and the second shielding flange 2132 and the second protruding rib 2122 form a second insertion slot, a part of the second side plate is inserted into the second insertion slot, which can play a positioning role between the cover body 21 and the first side plate and the second side plate, and is beneficial to improve the assembly efficiency and assembly precision of the battery box.

[0214] Exemplarily, the cover body 211 is configured as a large flat plate, and a rib or a pattern can be designed on the cover body 211 as needed to improve the structural strength or aesthetic appearance of the cover body 211.

[0215] In some embodiments, referring to Figures 13 to 15 , the cover body 21 is bonded to the end faces of the first end plate and the second end plate close to the side of the cover body 21.

[0216] That is, the cover body 21 is bonded and connected to the top surfaces of the first end plate and the second end plate at both ends along the second direction.

[0217] Exemplarily, referring to Figures 7 to 8 , at least one of the first end plate and the second end plate is configured to have a stepped portion 2311 and a flange portion 2312 at the end portion close to the side of the cover body 21 along the first direction, the stepped portion 2311 and the flange portion 2312 both extend along the third direction, the stepped portion 2311 has a first stepped surface 2313, a standing surface 2314 and a second stepped surface 2315 connected in sequence, along the second direction, the flange portion 2312 is located on the side of the accommodating cavity compared with the stepped portion 2311, and the second stepped surface 2315 is located between the first stepped surface 2313 and the flange portion 2312, along the first direction, the first stepped surface 2313 is located farther away from the bottom plate side compared with the second stepped surface 2315 and the flange portion 2312, the end edge (for example, the front end edge shown in Figure 3 ) of the cover body 21 along the second direction abuts against the standing surface 2314, and along the first direction, the cover body 21 abuts against the second stepped surface 2315.

[0218] In some embodiments, the first end plate and the second end plate are both configured to have a stepped portion 2311 and a flange portion 2312 at the end portion close to the side of the cover body 21 along the first direction.

[0219] In some embodiments, the flange portion 2312 and the step portion 2311 are arranged in the second direction, in which the flange portion 2312 is closer to the side where the accommodation cavity is located than the step portion 2311. Further, the flange portion 2312 and the step portion 2311 are arranged in the second direction with a gap therebetween.

[0220] In some embodiments, in 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 standing surface 2314 is connected between the first step surface 2313 and the second step surface 2315.

[0221] In some embodiments, the surface of the cover 21 in the second direction abuts against the standing surface 2314, and the surface of the cover 21 in the first direction toward the accommodation cavity abuts against the second step surface 2315 and the flange portion 2312.

[0222] In some embodiments, at least one of the surfaces of the first step surface 2313, the second step surface 2315, and the flange portion 2312 in the first direction toward the cover 21 is a flat surface.

[0223] In some embodiments, the surface of the first step surface 2313, the second step surface 2315, or the flange portion 2312 in the first direction toward the cover 21 can also be a curved surface with a slight curvature.

[0224] In some embodiments, as shown in FIG. 23, the number of flange portions 2312 is one or more. Figure 8

[0225] In some embodiments, the plurality of flange portions 2312 are arranged with a gap therebetween in the second direction.

[0226] In some embodiments, between the step portion 2311 and the flange portion 2312 in the second direction, there is a structural adhesive that bonds the first end plate and / or the second end plate to the cover plate.

[0227] In some embodiments, between adjacent flange portions 2312 in the second direction, there is a structural adhesive that bonds the first end plate and / or the second end plate to the cover plate.

[0228] Since the cover 21 abuts against the second step surface 2315 and the standing surface 2314, the relative position of the cover 21 to the first end plate and / or the second end plate is fixed, which reduces the difficulty of assembling the battery box.

[0229] In some embodiments, between the step portion 2311 and the flange portion 2312 in the second direction, there is a gap.

[0230] In some embodiments, the gap is filled with a structural adhesive.

[0231] ​Thus, the gap between the step portion 2311 and the flange portion 2312 can be filled with other components.

[0232] 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.

[0233] In some embodiments, see Figures 7 to 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.

[0234] 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.

[0235] 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.

[0236] 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 .

[0237] 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 .

[0238] Exemplarily, the glue overflow groove 2316 extends along the third direction.

[0239] Exemplarily, a glue overflow groove 2316 is provided on the second step surface 2315 .

[0240] 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.

[0241] In this embodiment, by forming at least one of the first end plate and the second end plate with the overflow groove 2316 on the end face close to the cover body 21 along the first direction, not only the connection strength of the cover body 21 and the first end plate and / or the second end plate can be enhanced, thereby enhancing the stability of the overall structure of the battery box body, but also the seal between the cover body 21 and the first end plate and / or the second end plate can be achieved, thereby improving the sealing performance of the battery box body.

[0242] In some embodiments, referring to Figure 3 and Figure 6 , at least one of the first side plate and the second side plate is configured to have a side plate body part 2331 and a side plate flange part 2332. The side plate body part 2331 is configured to be a plate shape extending along the first direction. The side plate flange part 2332 is connected to one end of the side plate body part 2331 along the first direction, and the side plate flange part 2332 is located on the side of the bottom plate away from the cover body 21 along the first direction and is connected to the bottom plate.

[0243] The first side plate can be configured to have the side plate body part 2331 and the side plate flange part 2332, the second side plate can be configured to have the side plate body part 2331 and the side plate flange part 2332, or both the first side plate and the second side plate can be configured to have the side plate body part 2331 and the side plate flange part 2332.

[0244] In some embodiments, the side plate flange part 2332 is bent relative to the side plate body part 2331.

[0245] In some embodiments, the side plate body part 2331 and the side plate flange part 2332 can be directly connected or indirectly connected. In a specific embodiment, the side plate body part 2331 and the side plate flange part 2332 are integrally formed.

[0246] In some embodiments, both sides of the battery module along the third direction (e.g., the left side and the right side as shown in Figure 3 ) are provided with the side plate body part 2331.

[0247] In some embodiments, both ends (e.g., the left end and the right end as shown in Figure 3 ) of the surface (e.g., the lower surface as shown in Figure 3 ) of the side of the bottom plate away from the cover body 21 along the first direction are contacted by different side plate flange parts 2332.

[0248] In some embodiments, the side plate body part 2331 of the first side plate and the side plate body part 2331 of the second side plate are respectively located on opposite sides (e.g., the left side and the right side as shown in Figure 3 ) of the bottom plate along the third direction, and the side plate flange part 2332 of the first side plate and the side plate flange part 2332 of the second side plate are both located on the side of the bottom plate away from the cover body 21 along the first direction and are connected to the bottom plate.

[0249] In some embodiments, as shown in FIG. 23A and FIG. 23B, the side plate flange portion 2332 is provided with a protrusion 2334 on the side thereof facing away from the accommodating cavity in the first direction. The protrusion 2334 is raised on the side facing away from the accommodating cavity. In this way, the protrusion 2334 can strengthen the side plate flange portion 2332, and further improve the support of the bottom plate by the side plate flange portion 2332. Figure 3 Figure 6 In some embodiments, the protrusion 2334 can be formed by thickening part of the side plate flange portion 2332.

[0250] In some embodiments, the protrusion 2334 can be formed by recessing part of the side plate flange portion 2332 on the side thereof facing away from the cover 21 in the first direction.

[0251] In some embodiments, the protrusion 2334 can be formed by recessing part of the side plate flange portion 2332 on the side thereof facing away from the cover 21 in the first direction.

[0252] In some embodiments, the protrusion 2334 extends in the second direction.

[0253] In some embodiments, the number of protrusions 2334 can be one or more. The plurality of protrusions 2334 can be arranged at intervals in the second direction or the third direction.

[0254] In some embodiments, the surface of the protrusion 2334 on the side thereof facing away from the accommodating cavity in the first direction is a flat surface.

[0255] Since the side plate flange portion 2332 is located on the side of the bottom plate facing away from the cover 21 in the first direction and is connected to the bottom plate, the side plate flange portion 2332 can provide support to the bottom plate and improve the load-bearing capacity of the bottom plate. Moreover, at least one of the first side plate and the second side plate is provided with the side plate body portion 2331 and the side plate flange portion 2332. During the assembly of the first side plate and / or the second side plate with other box walls in the battery box, the first side plate and / or the second side plate can be in abutment with the bottom plate to fix the relative position, thereby reducing the assembly difficulty of the battery box.

[0256] In some embodiments, the interior of the first wall 22 is provided with a medium flow channel, and a heat exchange medium flows in the medium flow channel. The heat exchange medium exchanges heat with the battery monomer assembly 10 and absorbs the heat generated by the battery monomer assembly 10.

[0257] In some embodiments, the interior of the bottom plate is provided with a medium flow channel.

[0258] Optionally, the medium flow channel can extend in the second direction or the third direction.

[0259] ​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 channels can also be one.

[0260] In some embodiments, the first wall 22 is exemplified by being provided with the medium flow channel, and the first wall 22 is further provided with an opening and an outlet, which are both in communication with the medium flow channel, the opening is used for flowing the heat exchange medium into the medium flow channel, and the outlet is used for flowing the heat exchange medium, which has been subjected to heat exchange, out of the medium flow channel. The opening and the outlet can be located at the same end surface or different end surfaces of the first wall 22. The opening and the outlet can also be located at at least one end surface of the first wall 22, which is perpendicular to the third direction.

[0261] In a specific embodiment, the first wall 22 is provided with multiple medium flow channels, the medium flow channels extend along the second direction, and the multiple medium flow channels are spaced apart along the third direction. Further, the multiple medium flow channels are substantially parallel to each other.

[0262] In a specific embodiment, the heat exchange medium is water.

[0263] In a specific embodiment, the first wall 22 is configured as a liquid cooling plate.

[0264] Since at least one of the first wall 22 and the second wall is provided with the heat exchange medium flow channel, the heat exchange medium in the heat exchange medium flow channel can take away the heat generated by the battery cell assembly 10, reduce the temperature of the battery cell assembly 10, reduce the probability of thermal runaway of the battery cell assembly 10, and further reduce the probability of thermal runaway of the battery device 100. In addition, no additional heat exchange member is needed to perform heat exchange on the battery cell assembly 10, which is conducive to improving the structural compactness and energy density of the battery device 100 while reducing the manufacturing cost.

[0265] In some embodiments, referring to Figures 2 to 5 , the battery device 100 further comprises at least one binding member 30, the at least one binding member 30 is used for binding the battery box, and the at least one binding member 30 is located outside the accommodating cavity.

[0266] In some embodiments, the binding member 30 is located outside the accommodating cavity. The binding member 30 can be arranged outside the battery box; the binding member 30 can also be embedded in the battery box, for example, the binding member 30 is embedded in the first wall 22 and / or the cover 21.

[0267] In some embodiments, the material of the binding member 30 is high-strength spring steel or carbon steel.

[0268] Optionally, the number of the binding member 30 can be one or more.

[0269] In some embodiments, the plurality of binders 30 can be arranged along the third direction or the second direction substantially in parallel or non-parallel.

[0270] In some embodiments, referring to Figures 2 to 5 , the plurality of binders 30 can be arranged along a direction substantially same as the direction of arrangement of the plurality of battery cell assemblies 10.

[0271] In some embodiments, the binder 30 can extend along the third direction or the second direction.

[0272] As the binder 30 binds the battery case, the binder 30 can strengthen the strength of the battery case, and when the battery cell assembly 10 expands due to heat and presses the battery case, the binder 30 can apply a binding force to the battery case, reduce the probability of the battery case being partially bulged or even damaged due to the battery cell assembly 10 releasing gas due to thermal runaway, thereby strengthening the strength of the battery case, reducing the probability or degree of deformation of the battery case, improving the outer contour size precision of the battery device 100, improving the appearance of the battery device 100, and canceling the step of pressing the battery case to prevent the battery case from being bulged and deformed during the inflation test stage in the assembly and production process of the battery device 100, thereby improving the production efficiency, and the binder 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.

[0273] In some embodiments, referring to Figures 2 to 4 , the at least one binder 30 includes at least one first binder 31, which is located on the side of the cover 21 relative to the battery cell assembly 10 along the first direction, and / or the at least one binder 30 includes at least one second binder 32, which is located on the side of the first wall 22 relative to the battery cell assembly 10 along the first direction, as shown in Figure 5 , the binder 30 includes a binder main body part 33 and a binder connecting part 34, the binder connecting part 34 is located at both ends of the binder main body part 33 and is connected with the binder main body part 33, and the binder connecting part 34 is connected to the side wall 23.

[0274] Optionally, the first binder 31 can be located on the side of the cover 21 away from the battery cell assembly 10 along the first direction; the first binder 31 can also be located in the cover 21.

[0275] Optionally, the number of first binders 31 can be one or more. The plurality of first binders 31 can be arranged at intervals.

[0276] In a specific embodiment, the plurality of first binders 31 are arranged at intervals along the third direction.

[0277] Optionally, the second binding member 32 can be located on a side of the first wall 22 facing away from the battery monomer assembly 10 in the first direction; the second binding member 32 can also be located in the first wall 22.

[0278] Optionally, the number of the second binding member 32 can be one or more. The plurality of second binding members 32 can be spaced apart.

[0279] In a specific embodiment, the plurality of second binding members 32 are spaced apart in the third direction.

[0280] In some embodiments, as shown in Figure 5 The binding member 30 includes a binding member body part and a binding member connecting part 34 connected to the binding member body part, and both ends of the binding member body part in the second direction are provided with the binding member connecting part 34.

[0281] Optionally, the binding member body part and the binding member connecting part 34 can be an integral part, or a split structure.

[0282] Optionally, the material of the binding member body part and the material of the binding member connecting part 34 can be the same or different.

[0283] In some embodiments, the binding member body part of the first binding member 31 is connected to the first wall 22, and the two binding member connecting parts 34 of the first binding member 31 are respectively connected to the two side walls 23 opposite in the second direction or the third direction.

[0284] In some embodiments, the binding member body part of the second binding member 32 is connected to the second wall, and the two binding member connecting parts 34 of the second binding member 32 are respectively connected to the two side walls 23 opposite in the second direction or the third direction.

[0285] In some embodiments, the binding member connecting part 34 and the side wall 23 can be directly connected or indirectly connected. For example, the binding member connecting part 34 and the side wall 23 can be connected through a connecting member.

[0286] Optionally, the binding member connecting part 34 and the side surface of the side wall 23 perpendicular to the first direction are connected; the binding member connecting part 34 can also be connected to the side surface of the first side wall 231 and / or the second side wall 232 perpendicular to the second direction; the binding member connecting part 34 can also be connected to the side surface of the third side wall 233 and / or the fourth side wall 234 perpendicular to the third direction.

[0287] In some embodiments, the connecting member includes a connecting part and a connecting flange, the connecting part sequentially passes through at least part of the binding member connecting part 34 and the side wall 23, and the connecting flange abuts against the binding member connecting part 34.

[0288] In some embodiments, the side wall 23 has a mounting boss, and the connecting member connects the mounting boss and the restraint member connecting portion 34.

[0289] Optionally, the connecting member can be a bolt or a screw, etc.

[0290] Since the restraint member connecting portion 34 is connected with the side wall 23, under the pulling of the restraint member 30, the side wall 23 connected with the restraint member connecting portion 34 respectively can clamp the battery monomer assembly 10, so as to reduce the probability or the degree of expansion of the battery monomer assembly 10 due to charging and / or discharging.

[0291] It can be understood that the side where 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 is located can also have the first restraint member 31.

[0292] In some embodiments, referring to Figures 2 to 5 , the restraint member main body portion 33 is configured in a strip shape and the length direction is consistent with the second direction, and the two restraint member connecting portions 34 are respectively connected to the first side wall 231 and the second side wall 232.

[0293] The probability of deformation of the large-face shell wall 1121 of the battery monomer 11 due to charging and / or discharging of the battery monomer 11 is relatively large, since the large-face shell wall 1121 is perpendicular to the second direction, and the two restraint member connecting portions 34 are respectively connected to the first side wall 231 and the second side wall 232, the large-face shell wall 1121 can have a relatively large clamping force along the second direction, thereby reducing the probability or the degree of deformation of the large-face shell wall 1121 due to the increase of the pressure in the battery monomer 11 caused by the charging and / or discharging of the battery monomer 11, and further reducing the probability or the degree of deformation of the battery device 100.

[0294] In some embodiments, referring to Figures 2 to 4 , the first end plate and the second end plate are both connected to the bottom plate, and along the first direction, the end surface (for example, the lower end surface shown in Figure 3 ) of each of the first end plate and the second end plate abuts against the surface (for example, the upper surface shown in Figure 3 ) of the bottom plate toward the cover body 21 side along the first direction.

[0295] In some embodiments, along the first direction, the end surface (for example, the lower end surface shown in Figure 3 ) of each of the first end plate and the second end plate is connected to the surface of the bottom plate toward the cover body 21 side along the first direction by structural adhesive connection.

[0296] In some embodiments, along the first direction, the first end plate is connected to the bottom plate by the second restraint member 32, and the second end plate is connected to the bottom plate by the second restraint member 32.

[0297] In some embodiments, the binding body part 33 of the second binding member 32 is located on the side of the bottom plate away from the accommodating cavity along the first direction, and the binding connecting part 34 of the second binding member 32 is connected to the first end plate and the second end plate respectively, so that the first end plate and the second end plate are both connected to the bottom plate.

[0298] Since the relative positions of the first end plate and the second end plate to the bottom plate are fixed, the assembly difficulty of the battery box body is reduced.

[0299] In some embodiments, referring to Figure 6 , Figure 11 and Figure 12 at least one of the first side plate and the second side plate is configured to include a side plate body part 2331 and an insulation layer 2333. The side plate body part 2331 is configured to be a plate shape extending along the first direction, the insulation layer 2333 is arranged between the side plate body part 2331 and the battery monomer assembly 10, and the insulation layer 2333 is in contact with at least one battery monomer 11.

[0300] The first side plate can be configured to have the side plate body part 2331 and the insulation layer 2333, the second side plate can be configured to have the side plate body part 2331 and the insulation layer 2333, or both the first side plate and the second side plate can be configured to have the side plate body part 2331 and the insulation layer 2333.

[0301] Exemplarily, the insulation layer 2333 can extend along the first direction.

[0302] Exemplarily, the insulation layer 2333 can be an insulation coating coated on the side plate body part 2331, or a plate structure formed of an insulation material.

[0303] By configuring at least one of the first side plate and the second side plate to include the side plate body part 2331 and the insulation layer 2333, and by the insulation layer 2333 being in contact with at least one battery monomer 11, the insulation performance between the box body assembly 20 and the battery monomer 11 is improved, thereby improving the reliability of the battery device 100.

[0304] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the present application.

Claims

1. A battery device, characterized in that: include: A battery box, comprising a cover, a bottom plate, and a plurality of side walls, wherein the side walls comprise a first end plate, a second end plate, a first side plate, and a second side plate; the bottom plate and the cover are arranged opposite each other along a first direction; a first end of each side wall along the first direction is connected to the bottom plate; and a second end of each side wall along the first direction is connected to the cover; the bottom plate, 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. An accommodating gap is defined between the rib, at least one battery cell assembly, and at least one side wall. An adhesive layer is defined in the accommodating gap. The adhesive layer is used to bond the rib to the side wall and to bond the rib to the battery cell assembly. The adhesive layer is also used to seal the accommodating gap. The adhesive layer includes a first layer, the first layer is located between the rib and at least one of the side walls, 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. The side wall contacts the battery cell assembly forming the accommodation gap, 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.

2. The battery device according to claim 1, wherein: The first layer is connected to the second layer; or, The first layer is spaced apart from the second layer.

3. 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 at least one battery cell assembly is carried on the bottom plate.

4. The battery device according to claim 3, 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.

5. The battery device according to claim 3, wherein: 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.

6. The battery device according to claim 5, characterized in that The first end plate and the second end plate are arranged opposite to each other along the second direction, the first side plate and the second side plate are arranged opposite to each other along the third direction, and the first direction, the second direction and the third direction intersect each other. 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.

7. The battery device according to claim 3, characterized in that The cover body is bonded to the end surfaces of the first end plate and the second end plate close to the cover body.

8. The battery device according to any one of claims 3 to 7, 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.

9. The battery device according to any one of claims 3 to 7, characterized in that The bottom plate is provided with a medium flow channel.

10. The battery device according to any one of claims 3 to 7, 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.

11. The battery device according to any one of claims 3 to 7, 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.

12. The battery device according to any one of claims 3 to 7, 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.

13. The battery device according to claim 12, 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 bottom plate 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.

14. The battery device according to claim 13, wherein: 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 end plate and the second end plate.

15. An electrical device, characterized in that: The electrical device comprises the battery device according to any one of claims 1 to 14.

16. An energy storage device, characterized in that: The energy storage device comprises the battery device according to any one of claims 1 to 14.

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