Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a box body and a battery cell assembly. The box body comprises a plurality of box walls, a containing space is defined by the box walls, and the battery monomer assembly is arranged in the containing space. The battery device further comprises filling pieces, containing cavities are formed in the box walls, the filling pieces are arranged in the containing cavities of at least one box wall, and the density of the filling pieces ranges from 0.5 g / cm < 3 > to 5 g / cm < 3 >. And the filling piece is arranged in the accommodating cavity and has a certain supporting effect on the box wall, so that the impact resistance of the box body is improved, the strength of the box wall is improved, and the reliability of the battery device is improved. When some electric devices (such as loaders, excavators, cranes and the like) work, additional counter weight parts need to be arranged to keep balance, when the battery device is applied to the electric devices, the filling parts are arranged in the containing cavities of at least one box wall, the weight of the battery device can be increased, and therefore the space, used for weight increasing, of the electric devices can be saved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] In the development of battery device technology, how to improve the reliability of battery devices is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The present application provides a battery device and an electrical device, which can improve the reliability of the battery device.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, the present application provides a battery device, the battery device comprising a box body and a battery cell assembly. The box body comprises a plurality of box walls, the plurality of box walls enclose a storage space, and the battery cell assembly is arranged in the storage space. The battery device further comprises a filling piece, a storage cavity is formed inside the box wall, and a filling piece is arranged in the storage cavity of at least one box wall.

[0007] The technical solution of the embodiment of the present application is to set a filling piece in the accommodating cavity. When the box body is subjected to external impact and the box wall is deformed, the filling piece can contact the two opposite box walls, and has a certain supporting effect on the box wall, which is conducive to improving the impact resistance of the box body and the strength of the box wall, thereby helping to improve the reliability of the battery device. At the same time, some electrical devices (such as loaders, excavators, cranes, etc.) need to be equipped with additional counterweights to maintain balance during operation. When the battery device is applied to the above-mentioned electrical devices, by setting a filling piece in the accommodating cavity of at least one box wall, it is conducive to increasing the weight of the battery device and reducing the size of the counterweight, thereby saving space for weight increase of the electrical device.

[0008] In some embodiments, the density of the filler is 0.5 g / cm 3 ~5g / cm 3 .

[0009] The technical solution of the embodiment of the present application, the density of the filler meets the above conditions, when the density of the filler is greater than or equal to 0.5g / cm 3 When the density is greater than 5g / cm 3The filling cost is high. When the density of the filling is less than or equal to 5g / cm 3 When the filling is used, the cost of the filling is lower.

[0010] In some embodiments, the density of the filler is 0.6 g / cm 3 ~3g / cm 3 .

[0011] According to the technical solution of the embodiment of the present application, the density of the filling member meets the above conditions, so that the cost of the filling member is relatively low while meeting the weight gain requirements.

[0012] In some embodiments, each receiving cavity is provided with a filling piece.

[0013] According to the technical solution of the embodiment of the present application, each accommodating cavity is provided with a filling piece, which is further helpful to improve the strength of the box body, and to increase the weight of the battery device, thereby helping to improve the reliability of the battery device.

[0014] In some embodiments, the accommodating cavity includes a first accommodating cavity and a second accommodating cavity, the plurality of box walls include a first box wall and a plurality of second box walls, the first box wall has a first accommodating cavity formed inside, and the second box wall has a second accommodating cavity formed inside. In a first direction, one end of the plurality of second box walls is arranged around the outer periphery of the first box wall to define an accommodating space, the battery cell assembly is carried by the first box wall, and the first direction is parallel to the thickness direction of the first box wall.

[0015] According to the technical solution of the embodiment of the present application, a first accommodating cavity is formed on the first box wall, and a second accommodating cavity is formed on the second box wall. A filling piece can be arranged in the first accommodating cavity and / or the second accommodating cavity. The filling piece can be flexibly arranged, which is beneficial to increasing the weight of the battery device and improving the strength of the box body.

[0016] In some embodiments, first openings communicating with the second accommodating chamber are respectively provided at both ends of the second box wall, and multiple second box walls are connected end to end, and the first openings of two adjacent second box walls are communicated, so that two adjacent second accommodating chambers are connected to each other.

[0017] The technical solution of the embodiment of the present application connects two adjacent second accommodating chambers. When setting a filling piece in the second accommodating chamber, an opening can be set on only one second box wall, and the filling piece can be set in the second accommodating chamber through the opening. The filling piece can then be set in other second accommodating chambers via the second accommodating chamber, which helps to improve the convenience of setting the filling piece.

[0018] In some embodiments, the second box wall has a second opening at one end in the first direction, and the second opening connects the first accommodating cavity and the second accommodating cavity.

[0019] The technical solution of the embodiment of the present application connects the first accommodating cavity and the second accommodating cavity. When setting the filling piece in the second accommodating cavity and the first accommodating cavity, an opening can be set only in one of the first box wall or the second box wall, and the filling piece can be set in one of the second accommodating cavity and the first accommodating cavity through the opening, and then the filling piece can be set in the other one through the accommodating cavity, which helps to improve the convenience of setting the filling piece.

[0020] In some embodiments, the box body further includes a first partition, which is disposed in the second accommodating cavity and divides the second accommodating cavity into at least two first sub-accommodating cavities arranged along the first direction.

[0021] The technical solution of the embodiment of the present application is to arrange the first partition in the second accommodating cavity to divide the second accommodating cavity into at least two first sub-accommodating cavities, that is, the two ends of the first partition are respectively connected to the inner wall of the second accommodating cavity, which is beneficial to improve the strength of the second box wall.

[0022] In some embodiments, the first partition is provided with a first through hole, and the first through hole penetrates two surfaces of the first partition in the first direction to connect two adjacent first sub-accommodation cavities.

[0023] The technical solution of the embodiment of the present application, by setting a first through hole in the first partition, allows filling a filler into one of the first sub-accommodating cavities, and enables other first sub-accommodating cavities to also be provided with a filler, which helps to improve the convenience of setting the filler.

[0024] In some embodiments, the second box wall has an inner surface facing the accommodating space and an outer surface away from the accommodating space, and the inner surface is provided with a second through hole communicating with the second accommodating cavity; and / or the outer surface is provided with a second through hole communicating with the second accommodating cavity.

[0025] According to the technical solution of the embodiment of the present application, a second through hole is provided on the inner surface or the outer surface of the second box wall, and a filling piece is filled into the second accommodating cavity through the second through hole, which helps to improve the convenience of setting the filling piece.

[0026] In some embodiments, the battery device further includes a blocking member, which is disposed on the second box wall and blocks the second through hole.

[0027] The technical solution of the embodiment of the present application reduces the risk of leakage of the filling member from the second accommodating cavity by providing a blocking member to block the second through hole, which helps to increase the weight of the battery device.

[0028] In some embodiments, the box body also includes a second partition, which is arranged in the first accommodating cavity, and the second partition is respectively connected to the first box wall at both ends in the first direction, and divides the first accommodating cavity into at least two second sub-accommodating cavities arranged along the second direction, and the first direction is perpendicular to the second direction.

[0029] The technical solution of the embodiment of the present application is to divide the first accommodating cavity into at least two second sub-accommodating cavities by arranging the second partition in the first accommodating cavity, that is, the two ends of the second partition are respectively connected to the inner wall of the first accommodating cavity, which is beneficial to improving the strength of the first box wall.

[0030] In some embodiments, the second partition is provided with a third through hole, and the third through hole penetrates two surfaces of the second partition in the second direction to connect two adjacent second sub-accommodation cavities.

[0031] The technical solution of the embodiment of the present application, by setting a third through hole in the second partition, allows filling a filler into one of the second sub-accommodation chambers, and enables other second sub-accommodation chambers to also be provided with a filler, which helps to improve the convenience of setting the filler.

[0032] In a second aspect, the present application further provides an electrical device, comprising a battery device according to any one of the embodiments in the first aspect, wherein the battery device is used to provide electrical energy to the electrical device.

[0033] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0036] Figure 2 An exploded view of the structure of a battery device provided in some embodiments of the present application;

[0037] Figure 3 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0038] Figure 4 A schematic diagram of a box provided in some embodiments of the present application;

[0039] Figure 5 A structural exploded view of a box provided in some embodiments of the present application;

[0040] Figure 6 A schematic diagram of the connection between the first sub-box wall and the first box wall provided in some embodiments of the present application;

[0041] Figure 7 A schematic diagram of the connection between the second sub-box wall and the first box wall provided in some embodiments of the present application;

[0042] Figure 8 A schematic diagram of a second box wall provided for some embodiments of the present application;

[0043] Fig. 9 A schematic diagram of a first separator provided in some embodiments of the present application;

[0044] Fig.10 A schematic diagram of a second separator provided in some embodiments of the present application.

[0045] Icons: 1-battery device; 10-battery cell assembly; 11-battery cell; 111-electrode terminal; 112-housing; 113-housing; 114-end cover; 115-electrode assembly; 20-box; 21-box wall; 211-first box wall; 2111-fifth wall; 2112-sixth wall; 212-second box wall; 2121-inner surface; 2122-outer surface; 2123-second through hole; 2124-first sub-box wall; 2125-second sub-box wall; 2126-first wall; 2127-second wall; 2128-third wall; 21 29-fourth wall; 22-accommodating space; 23-accommodating chamber; 231-first accommodating chamber; 2311-second sub-accommodating chamber; 232-second accommodating chamber; 2321-first opening; 2322-second opening; 2323-first sub-accommodating chamber; 24-first partition; 241-first through hole; 25-second partition; 251-third through hole; 26-first box body; 27-second box body; 30-filling piece; 40-blocking piece; 100-vehicle; 110-controller; 120-motor; Z-first direction; X-second direction; Y-third direction. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0048] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] The term "and / or" in this application is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or the second direction can represent: A exists alone, A and the second direction exist at the same time, and the second direction exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0051] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0052] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0053] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0054] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0055] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0056] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0057] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0058] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0059] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0060] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0061] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0062] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, as environmental conditions and / or internal conditions of the battery change, the reliability of the battery device is also one of the key factors to consider.

[0063] At present, the battery cell assembly is arranged in a box body to form a battery device. In order to improve the energy density of the battery device and save the cost of the box body, a cavity is usually formed inside the box wall of the box body.

[0064] However, the box wall forming the cavity has low strength, which makes the reliability of the box body poor. There is a risk that the box body is damaged, thereby causing damage to the battery cell assembly, which affects the reliability of the battery device.

[0065] Based on the above considerations, in order to solve the problem that the reliability of the box is poor and affects the reliability of the battery device, an embodiment of the present application provides a battery device. The battery device includes a box and a battery cell assembly. The box includes a plurality of box walls, and the plurality of box walls enclose a storage space, and the battery cell assembly is arranged in the storage space. Among them, the battery device also includes a filling piece, and the interior of the box wall has a storage cavity, and the storage cavity of at least one box wall is provided with a filling piece.

[0066] A filling piece is arranged in the accommodating cavity. When the box body is subjected to external impact and the box wall is deformed, the filling piece can contact the two opposite box walls, and has a certain supporting effect on the box wall, which is conducive to improving the impact resistance of the box body and the strength of the box wall, thereby improving the reliability of the battery device. At the same time, some electrical devices (such as loaders, excavators, cranes, etc.) need to be equipped with additional counterweights to maintain balance during operation. When the battery device is applied to the above-mentioned electrical devices, by arranging a filling piece in the accommodating cavity of at least one box wall, it is conducive to increasing the weight of the battery device, thereby saving the space used for weight increase of the electrical device.

[0067] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices, such as electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0068] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0069] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. The vehicle 100 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 1 is provided inside the vehicle 100, and the battery device 1 may be provided at the bottom, head or tail of the vehicle 100. The battery device 1 may be used to power the vehicle 100. For example, the battery device 1 may be used as an operating power source for the vehicle 100, for the circuit system of the vehicle 100, such as for the working power requirements during the startup, navigation and operation of the vehicle 100.

[0070] The vehicle 100 may further include a controller 110 and a motor 120 , wherein the controller 110 is used to control the battery device 1 to supply power to the motor 120 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 100 .

[0071] In some embodiments of the present application, the battery device 1 can not only serve as an operating power source for the vehicle 100 , but also serve as a driving power source for the vehicle 100 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100 .

[0072] The battery device 1 includes a battery cell assembly and a battery management system. The battery management system is electrically connected to the battery cell assembly and is used to manage the charging and discharging of the battery cell assembly.

[0073] Please refer to Figure 2 , Figure 2 The structural exploded diagram of the battery device provided in some embodiments of the present application. The battery device 1 may further include a box 20, in which the battery cell assembly 10 is accommodated. The box 20 is used to provide a storage space for the battery cell assembly 10, and the box 20 may adopt a variety of structures. In some embodiments, the box 20 may include a first box 26 and a second box 27, and the first box 26 and the second box 27 cover each other, and the first box 26 and the second box 27 jointly define a storage space 22 for accommodating the battery cell assembly 10. The first box 26 may be a hollow structure with one end open, and the second box 27 may be a plate-like structure, and the second box 27 covers the open side of the first box 26, so that the first box 26 and the second box 27 jointly define the storage space 22; the first box 26 and the second box 27 may also be hollow structures with one side open, and the open side of the first box 26 covers the open side of the second box 27.

[0074] In the battery device 1, there may be multiple battery cell assemblies 10, and the multiple battery cell assemblies 10 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cell assemblies 10 are both connected in series and in parallel. The multiple battery cell assemblies 10 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cell assemblies 10 is accommodated in the box 20; of course, the battery device 1 may also be a battery module formed by connecting multiple battery cell assemblies 10 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 20. The battery device 1 may also include other structures, for example, the battery device 1 may also include a busbar component for realizing electrical connection between the multiple battery cell assemblies 10.

[0075] The battery cell assembly 10 may include a plurality of battery cells 11 , and the battery cells 11 may be secondary batteries or primary batteries; the battery cells 11 may also be lithium-sulfur batteries, sodium-ion batteries or magnesium-ion batteries, but are not limited thereto.

[0076] Please refer to Figure 3 , Figure 3 The structural exploded diagram of the battery cell provided in some embodiments of the present application. Figure 3 As shown, the battery cell 11 includes a housing 112, an electrode assembly 115 and an electrode terminal 111. The housing 112 includes a shell 113 and an end cap 114. The shell 113 has an opening, and the end cap 114 closes the opening to isolate the internal environment of the battery cell 11 from the external environment.

[0077] The shell 113 is a component used to cooperate with the end cap 114 to form the internal environment of the battery cell 11, wherein the formed internal environment can be used to accommodate the electrode assembly 115, the electrolyte and other components. The shell 113 and the end cap 114 can be independent components. The shell 113 can be of various shapes and sizes. Specifically, the shape of the shell 113 can be determined according to the specific shape and size of the electrode assembly 115. The material of the shell 113 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0078] The end cap 114 refers to a component that covers the opening of the shell 113 to isolate the internal environment of the battery cell 11 from the external environment. Without limitation, the shape of the end cap 114 can be adapted to the shape of the shell 113 to match the shell 113. Optionally, the end cap 114 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 114 is not easily deformed when squeezed and collided, so that the battery cell 11 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals can be provided on the end cap 114. The electrode terminal can be used to electrically connect to the electrode assembly 115 for outputting or inputting electrical energy of the battery cell 11. The material of the end cap 114 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 114, and the insulating structure can be used to isolate the electrical connection components in the shell 113 from the end cap 114 to reduce the risk of short circuit. Exemplarily, the insulating structure may be plastic, rubber, or the like.

[0079] Please refer to Figure 2 , and refer to Figures 4 to 6 , Figure 4 A schematic diagram of a box provided in some embodiments of the present application, Figure 5 This is a structural exploded view of the box provided in some embodiments of the present application. Figure 6A schematic diagram of the connection between the first sub-box wall and the first box wall provided for some embodiments of the present application. In order to facilitate the display of the internal structure of the box body, part of the structure of the box body is hidden. In order to facilitate the display of the internal structure of the first box wall and the second box wall, part of the second box wall is hidden. An embodiment of the present application provides a battery device 1, which includes a box body 20 and a battery cell assembly 10. The box body 20 includes a plurality of box walls 21, and the plurality of box walls 21 enclose a storage space 22, and the battery cell assembly 10 is arranged in the storage space 22. In which, the battery device 1 also includes a filling piece 30, and a storage cavity 23 is formed inside the box wall 21, and the storage cavity 23 of at least one box wall 21 is provided with a filling piece 30.

[0080] In some embodiments, the box body 20 may be made of metal, such as aluminum, iron, copper, etc.

[0081] In some embodiments, the material of the box body 20 can be an alloy, such as aluminum alloy, iron alloy, copper alloy, etc.

[0082] In some embodiments, the box body 20 includes a plurality of box walls 21, which are connected to enclose a receiving space 22. For example, the box wall 21 may include a first box wall 211, a plurality of second box walls 212, and a box cover. In the first direction Z, one end of the plurality of second box walls 212 is arranged around the outer periphery of the first box wall 211, and the other end of the plurality of second box walls 212 forms an opening, which is closed by the box cover to form the receiving space 22. The battery cell assembly 10 is disposed in the receiving space 22.

[0083] In order to reduce the weight of the battery device 1 per unit volume and improve the energy density of the battery device 1, a receiving cavity 23 is usually formed inside the box wall 21, thereby reducing the weight of the battery device 1. In addition, the material price of the box wall 21 is relatively high, and forming the receiving cavity 23 inside the box wall 21 reduces the amount of raw materials of the box wall 21, which is conducive to cost saving.

[0084] In some embodiments, a receiving cavity 23 may be formed in one of the plurality of box walls 21 .

[0085] In some embodiments, several of the plurality of box walls 21 may be formed with a receiving cavity 23 .

[0086] In some embodiments, all of the plurality of box walls 21 may be formed with a receiving cavity 23 .

[0087] In some embodiments, the box wall 21 may form the accommodating cavity 23 by integral extrusion or injection molding.

[0088] In some embodiments, the battery device 1 may include a filling piece 30 , and the filling piece 30 may be disposed in the receiving cavity 23 of the box wall 21 .

[0089] When the number of the accommodating cavities 23 is one or more, the filling piece 30 can be arranged in only one accommodating cavity 23; when the number of the accommodating cavities 23 is more than one, the filling piece 30 can be arranged in several of the multiple accommodating cavities 23; when the number of the accommodating cavities 23 is more than one, all of the accommodating cavities 23 can be provided with the filling piece 30.

[0090] In some embodiments, when the filling piece 30 is disposed in the accommodating cavity 23, the filling piece 30 can fill the entire accommodating cavity 23. It should be noted that in the actual production process, due to process reasons or temperature reasons, after the filling piece 30 is disposed in the accommodating cavity 23, there may be a gap between the inner surface 2121 of the accommodating cavity 23 and the filling piece 30.

[0091] In some embodiments, when the filling piece 30 is disposed in the accommodating cavity 23 , the filling piece 30 can fill a portion of the space in the accommodating cavity 23 , that is, there is still space in the accommodating cavity 23 that is not occupied by the filling piece 30 .

[0092] In some embodiments, when the filling member 30 is filled in the accommodating cavity 23 , the filling member 30 may be a fluid, and after being disposed in the accommodating cavity 23 , the filling member 30 is condensed and formed inside the box wall 21 .

[0093] In some embodiments, the material of the filler 30 can be cement, resin, plastic, metal, or any combination of the above materials. The material of the filler 30 can also be other materials, not limited to the above materials.

[0094] In some embodiments, the filler 30 may be a mixture of resin, cement, and adhesive.

[0095] In some embodiments, the box wall 21 may be provided with an opening communicating with the accommodating cavity 23 , so as to facilitate filling the filling piece 30 into the accommodating cavity 23 .

[0096] The technical solution of the embodiment of the present application is to set a filling piece 30 in the accommodating cavity 23. When the box body 20 is impacted by the outside world and the box wall 21 is deformed, the filling piece 30 can contact the two opposite box walls 21, and has a certain supporting effect on the box wall 21, which is conducive to improving the impact resistance of the box body 20, and is conducive to improving the strength of the box wall 21, thereby helping to improve the reliability of the battery device 1. At the same time, some electrical devices (such as loaders, excavators, cranes, etc.) need to be equipped with additional counterweights to maintain balance during operation. When the battery device 1 is applied to the above-mentioned electrical devices, by setting a filling piece 30 in the accommodating cavity 23 of at least one box wall 21, it is conducive to increasing the weight of the battery device 1, thereby saving the space used for weight increase of the electrical device.

[0097] In some embodiments, the density of the filler 30 is 0.5 g / cm 3 ~5g / cm 3 .

[0098] In some embodiments, when the filler 30 is made of a resin material, the density of the filler 30 may be 0.5 g / cm 3 ~1g / cm 3 .

[0099] In some embodiments, when the material of the filler 30 is cement or metal, the density of the filler 30 can be 1 g / cm 3 ~5g / cm 3 .

[0100] In the technical solution of the embodiment of the present application, the density of the filler 30 meets the above conditions. When the density of the filler 30 is greater than or equal to 0.5 g / cm 3 When the density of the filler 30 is less than or equal to 5g / cm 3 When the filling member 30 is used, the cost is low and it is easy to obtain.

[0101] In some embodiments, the density of the filler 30 is 0.6 g / cm 3 ~3g / cm 3 .

[0102] In the technical solution of the embodiment of the present application, the density of the filler 30 meets the above conditions, which is further beneficial to increase the weight of the battery device 1 and reduce the cost.

[0103] In some embodiments, each accommodating cavity 23 is provided with a filling piece 30 .

[0104] In some embodiments, the box body 20 may include a plurality of box walls 21 , each of the box walls 21 may be formed with a receiving cavity 23 , and each of the receiving cavity 23 may be provided with a filling piece 30 .

[0105] According to the technical solution of the embodiment of the present application, each accommodating cavity 23 is provided with a filling piece 30 , which is further helpful to increase the weight of the battery device 1 , improve the strength of the box body 20 , and thus improve the reliability of the battery device 1 .

[0106] Please refer to Figures 4 to 6In some embodiments, the accommodating cavity 23 includes a first accommodating cavity 231 and a second accommodating cavity 232, and the plurality of box walls 21 include a first box wall 211 and a plurality of second box walls 212. The first box wall 211 is provided with a first accommodating cavity 231, and the second box wall 212 is provided with a second accommodating cavity 232. In the first direction Z, one end of the plurality of second box walls 212 is arranged around the outer periphery of the first box wall 211 to define the accommodating space 22. The battery cell assembly 10 is carried by the first box wall 211, and the first direction Z is parallel to the thickness direction of the first box wall 211.

[0107] In some embodiments, the plurality of box walls 21 may include a first box wall 211 and a plurality of second box walls 212 , and the battery cell assembly 10 is supported on the first box wall 211 , that is, the first box wall 211 may be a bottom wall.

[0108] The second box walls 212 are disposed around the outer periphery of the first box wall 211 , that is, the second box walls 212 may be side walls.

[0109] In some embodiments, the number of the second box walls 212 may be four.

[0110] In some embodiments, the first direction may be represented by the direction indicated by the letter Z in the figure.

[0111] In some embodiments, the first direction Z may be parallel to the thickness direction of the first box wall 211 , and the first direction Z may be parallel to the height direction of the battery device 1 .

[0112] In some embodiments, a first accommodating cavity 231 may be formed inside the first box wall 211 , and a second accommodating cavity 232 may be formed inside the second box wall 212 .

[0113] The filling piece 30 may only fill the first receiving cavity 231 .

[0114] The filling piece 30 may only fill at least one second accommodating cavity 232 .

[0115] The filling member 30 may be filled in the first accommodating cavity 231 and in at least one second accommodating cavity 232 .

[0116] In some embodiments, when the filling member 30 is filled in at least two accommodating cavities 23, the filling member 30 may be filled in each accommodating cavity 23. Alternatively, when the filling member 30 is filled in at least two accommodating cavities 23, at least two accommodating cavities 23 are interconnected, and the filling member 30 may be filled in one of the accommodating cavities 23, or the filling member 30 may be filled in each accommodating cavity 23 at the same time.

[0117] According to the technical solution of the embodiment of the present application, the first box wall 211 forms a first accommodating cavity 231, and the second box wall 212 forms a second accommodating cavity 232. A filling piece 30 can be arranged in the first accommodating cavity 231 and / or the second accommodating cavity 232. The filling piece 30 is flexibly arranged, which is beneficial to increasing the weight of the battery device 1 and the strength of the box body 20.

[0118] Please refer to Figures 4 to 6 , and refer to Figure 7 , Figure 7 A schematic diagram of the connection between the second sub-box wall and the first box wall provided in some embodiments of the present application. In order to facilitate the display of the internal structure of the second box wall, part of the second box wall is hidden. In some embodiments, the two ends of the second box wall 212 are respectively provided with a first opening 2321 that is connected to the second accommodating cavity 232, and a plurality of second box walls 212 are connected end to end, and the first openings 2321 of two adjacent second box walls 212 are connected, so that the two adjacent second accommodating cavities 232 are connected to each other.

[0119] In some embodiments, two adjacent second box walls 212 may be a first sub-box wall 2124 and a second sub-box wall 2125. Taking the number of second box walls 212 as four as an example, two first sub-box walls 2124 may be arranged opposite to each other along the second direction X, and two second sub-box walls 2125 may be arranged opposite to each other along the third direction Y.

[0120] In some embodiments, the second direction may be represented by the direction indicated by the letter X in the figure, and the third direction may be represented by the direction indicated by the letter Y in the figure.

[0121] The second direction X may be parallel to the length direction of the battery device 1 , and the third direction Y may be parallel to the width direction of the battery device 1 .

[0122] The first direction Z, the second direction X, and the third direction Y may be perpendicular to each other.

[0123] In some embodiments, one end of the two first sub-box walls 2124 in the first direction Z can be connected to the two ends of the first box wall 211 in the second direction X, one end of the two second sub-box walls 2125 in the first direction Z can be connected to the two ends of the first box wall 211 in the third direction Y, the two ends of one first sub-box wall 2124 in the third direction Y can be respectively connected to one end of the two second sub-box walls 2125 in the second direction X, and the two ends of the other first sub-box wall 2124 in the third direction Y can be respectively connected to the other end of the two second sub-box walls 2125 in the second direction X.

[0124] In some embodiments, the first sub-box wall 2124 may have first openings 2321 at both ends in the third direction Y, and the second sub-box wall 2125 may have first openings 2321 at both ends in the second direction X. When the first sub-box wall 2124 and the second sub-box wall 2125 are connected, the first opening 2321 of the first sub-box wall 2124 and the first opening 2321 of the second sub-box wall 2125 are in communication, so that the second accommodating cavity 232 of the first sub-box wall 2124 and the second accommodating cavity 232 of the second sub-box wall 2125 are in communication.

[0125] When filling the filling piece 30 into the second accommodating cavity 232 of one of the first sub-box walls 2124 or into the second accommodating cavity 232 of one of the second sub-box walls 2125, it is possible to fill the second accommodating cavity 232 of all the second box walls 212 with the filling piece 30, which helps to improve the convenience of setting the filling piece 30 in the second accommodating cavity 232.

[0126] Alternatively, the filling pieces 30 may be filled into the second accommodating cavities 232 of the second box walls 212 at the same time, which helps to improve the efficiency of setting the filling pieces 30 in the second accommodating cavities 232 .

[0127] It should be noted that the filling member 30 may have fluidity. The filling member 30 may be cement, and the cement may be diluted by liquid (such as water) so that the filling member 30 has a certain fluidity. When the filling member 30 is filled into a second accommodating cavity 232, the filling member 30 will flow from one second accommodating cavity 232 to an adjacent second accommodating cavity 232. After filling, the filling member 30 will solidify and become solid after standing for a period of time.

[0128] The filler 30 can be a resin, which is melted by heating so that the filler 30 has a certain fluidity. When the filler 30 is filled into a second accommodating cavity 232, the filler 30 will flow from one second accommodating cavity 232 to the adjacent second accommodating cavity 232. After filling, after standing for a period of time, the temperature of the filler 30 decreases, thereby solidifying and becoming solid.

[0129] The technical solution of the embodiment of the present application connects two adjacent second accommodating chambers 232. When setting the filling piece 30 in the second accommodating chamber 232, an opening can be set in only one second box wall 212, and the filling piece 30 can be set in the second accommodating chamber 232 through the opening. Then, the filling piece 30 can be set in other second accommodating chambers 232 through the second accommodating chamber 232, which helps to improve the convenience of setting the filling piece 30.

[0130] Please refer to Figures 4 to 7 , and refer to Figure 8 , Figure 8Schematic diagram of the second box wall provided in some embodiments of the present application. In some embodiments, the second box wall 212 has a second opening 2322 at one end in the first direction Z, and the second opening 2322 communicates with the first accommodating cavity 231 and the second accommodating cavity 232 .

[0131] In some embodiments, one end of the first sub-box wall 2124 is connected to one end of the first box wall 211 in the second direction X, and the first sub-box wall 2124 and the first box wall 211 are projected on a projection plane perpendicular to the second direction X with the second direction X as the projection direction, so as to obtain the orthographic projection of the first sub-box wall 2124 and the orthographic projection of the first box wall 211, and the orthographic projection of one end of the first sub-box wall 2124 in the first direction Z overlaps with the orthographic projection of the first box wall 211. That is, one end of the first sub-box wall 2124 in the first direction Z refers to one end of the first sub-box wall 2124 close to the first box wall 211 in the first direction Z, and the end has a certain size in the first direction Z, rather than the end face in the first direction Z. The second opening 2322 is provided at one end of the first sub-box wall 2124 in the first direction Z to connect the first accommodation cavity 231 and the second accommodation cavity 232.

[0132] In some embodiments, one end of the second sub-box wall 2125 is connected to one end of the first box wall 211 in the third direction Y, and the third direction Y is used as the projection direction. The second sub-box wall 2125 and the first box wall 211 are projected on a projection plane perpendicular to the third direction Y to obtain the orthographic projection of the second sub-box wall 2125 and the orthographic projection of the first box wall 211, and the orthographic projection of one end of the second sub-box wall 2125 in the first direction Z overlaps with the orthographic projection of the first box wall 211. That is, one end of the second sub-box wall 2125 in the first direction Z refers to one end of the second sub-box wall 2125 close to the first box wall 211 in the first direction Z, and the end has a certain size in the first direction Z, rather than an end face in the first direction Z. The second opening 2322 is provided at one end of the second sub-box wall 2125 in the first direction Z to connect the first accommodating cavity 231 and the second accommodating cavity 232.

[0133] In some embodiments, the second box wall 212 may include a first wall 2126, a second wall 2127, a third wall 2128, and a fourth wall 2129 connected end to end in sequence, and the first wall 2126, the second wall 2127, the third wall 2128, and the fourth wall 2129 jointly define a second accommodating cavity 232. In the first sub-box wall 2124, the first wall 2126 and the third wall 2128 are arranged oppositely along the second direction X, and the second wall 2127 and the fourth wall 2129 are arranged oppositely along the first direction Z, wherein the first wall 2126 is a wall forming the accommodating space 22, and the second wall 2127 is a wall close to the first box wall 211. In the second sub-box wall 2125, the first wall 2126 and the third wall 2128 are arranged relatively to each other along the third direction Y, and the second wall 2127 and the fourth wall 2129 are arranged relatively to each other along the first direction Z, wherein the first wall 2126 is a wall forming the accommodating space 22, and the second wall 2127 is a wall close to the first box wall 211.

[0134] In some embodiments, the first wall 2126 may have a flange at one end facing away from the fourth wall 2129 in the first direction Z, and the flange extends in a direction away from the third wall 2128. The second wall 2127 has a flange at one end facing away from the third wall 2128, and the flange extends in a direction away from the third wall 2128. The flange of the first wall 2126 is connected to the flange of the second wall 2127 and extends into the first accommodating cavity 231.

[0135] In some embodiments, the second opening 2322 can be disposed at the flange of the first wall 2126 .

[0136] In some embodiments, the second opening 2322 can be disposed at the flange of the second wall 2127 .

[0137] In some embodiments, the first box wall 211 may have a first accommodating cavity 231 , and the first box wall 211 may be provided with openings at both ends in the second direction X, and the first box wall 211 may be provided with openings at both ends in the third direction Y. The plurality of second box walls 212 may respectively block the respective openings of the first box wall 211 .

[0138] The technical solution of the embodiment of the present application connects the first accommodating chamber 231 and the second accommodating chamber 232. When setting the filling piece 30 in the second accommodating chamber 232 and the first accommodating chamber 231, an opening can be set only in one of the first box wall 211 or the second box wall 212, and the filling piece 30 can be set in one of the second accommodating chamber 232 and the first accommodating chamber 231 through the opening, and then the filling piece 30 can be set in the other one through the accommodating chamber, which helps to improve the convenience of setting the filling piece 30.

[0139] Please refer to Figures 4 to 8 , and refer to Fig. 9 , Fig. 9Schematic diagram of the first partition provided in some embodiments of the present application. In some embodiments, the box body 20 further includes a first partition 24, which is disposed in the second accommodating cavity 232 and divides the second accommodating cavity 232 into at least two first sub-accommodating cavities 2323 arranged along the first direction Z.

[0140] In some embodiments, the first partition 24 may be disposed in the second receiving cavity 232. At least one second receiving cavity 232 may be provided with the first partition 24.

[0141] In some embodiments, the first partition 24 may be a plate-shaped member, one end of the first partition 24 is connected to the first wall 2126 , and the other end of the first partition 24 is connected to the third wall 2128 .

[0142] In some embodiments, the first partition 24 can be formed by rolling or stamping a metal plate. The first partition 24 can include multiple sections of plates connected in sequence, one of which extends along the first direction Z and is connected to the inner wall surface of the first wall 2126 or the third wall 2128 in two adjacent sections, and the other section can extend along the second direction X or the third direction Y. For example, in the first sub-box wall 2124, another section extends along the second direction X, and in the second sub-box wall 2125, another section extends along the third direction Y, wherein the two ends of the other section are respectively connected to the first wall 2126 and the third wall 2128, and the second accommodating chamber 232 is divided into two adjacent first sub-accommodating chambers 2323.

[0143] It should be noted that the connection method can be welding or bolt connection.

[0144] In addition, one of the multiple sections of the plate can be connected to the inner wall surface of the second wall 2127, and one of the multiple sections can be connected to the inner wall surface of the fourth wall 2129.

[0145] It should be noted that the inner wall surface may be a wall surface of the second box wall 212 that forms the second accommodating cavity 232 .

[0146] The technical solution of the embodiment of the present application is to arrange the first partition 24 in the second accommodating cavity 232 to divide the second accommodating cavity 232 into at least two first sub-accommodating cavities 2323, that is, the two ends of the first partition 24 are respectively connected to the inner wall of the second accommodating cavity 232, which is beneficial to improve the strength of the second box wall 212.

[0147] Please refer to Figures 4 to 9 In some embodiments, the first partition 24 is provided with a first through hole 241 , and the first through hole 241 penetrates two surfaces of the first partition 24 in the first direction Z to connect two adjacent first sub-accommodating chambers 2323 .

[0148] In some embodiments, the plate segment extending along the second direction X or along the third direction Y may be provided with a first through hole 241 , which passes through two surfaces of the segment in the first direction Z, thereby connecting two adjacent first sub-accommodation cavities 2323 .

[0149] When the filling piece 30 is filled into one of the first sub-accommodating cavities 2323 , the fluidity of the filling piece 30 is utilized so that the other first sub-accommodating cavities 2323 can also be filled with the filling piece 30 .

[0150] The technical solution of the embodiment of the present application is to set a first through hole 241 in the first partition 24 so that a filling piece 30 is filled into one of the first sub-accommodating cavities 2323 , and other first sub-accommodating cavities 2323 are also provided with filling pieces 30 , which is conducive to improving the convenience of setting the filling pieces 30 .

[0151] Please refer to Figures 4 to 8 In some embodiments, the second box wall 212 has an inner surface 2121 facing the accommodating space 22 and an outer surface 2122 away from the accommodating space 22, and the inner surface 2121 is provided with a second through hole 2123 communicating with the second accommodating cavity 232; and / or, the outer surface 2122 is provided with a second through hole 2123 communicating with the second accommodating cavity 232.

[0152] In some embodiments, the inner surface 2121 of the second box wall 212 may be a surface of the second box wall 212 for forming the accommodating space 22 , and the outer surface 2122 of the second box wall 212 may be a surface of the second box wall 212 facing away from the accommodating space 22 .

[0153] In some embodiments, the inner surface 2121 of the second box wall 212 may be provided with a second through hole 2123 .

[0154] In some embodiments, the outer surface 2122 of the second box wall 212 may be provided with a second through hole 2123 .

[0155] In some embodiments, both the inner surface 2121 and the outer surface 2122 of the second box wall 212 may be provided with second through holes 2123 .

[0156] In some embodiments, among the plurality of second box walls 212 , at least one second box wall 212 may be provided with a second through hole 2123 .

[0157] In some embodiments, the number of the second through holes 2123 may be multiple, and the multiple second through holes 2123 may be arranged at intervals along the first direction Z. Alternatively, in the first sub-box wall 2124, the multiple second through holes 2123 may be arranged at intervals along the third direction Y. Alternatively, in the second sub-box wall 2125, the multiple second through holes 2123 may be arranged at intervals along the second direction X.

[0158] In some embodiments, the outer surface 2122 of the second box wall 212 may be provided with a second through hole 2123. In the electrical device, there may be multiple battery devices 1, and the multiple battery devices 1 may be stacked and arranged. Two adjacent battery devices 1 may be fixed by a binding member (such as a plastic strap or a metal strap) passing through the second through holes 2123 of the two battery devices 1.

[0159] According to the technical solution of the embodiment of the present application, a second through hole 2123 is provided on the inner surface 2121 or the outer surface 2122 of the second box wall 212 , and a filling piece 30 is filled into the second accommodating cavity 232 through the second through hole 2123 , which helps to improve the convenience of setting the filling piece 30 .

[0160] Please refer to Figure 5 In some embodiments, the battery device 1 further includes a blocking member 40 , which is disposed on the second box wall 212 and blocks the second through hole 2123 .

[0161] In some embodiments, the blocking member 40 may be a plate-shaped member. The blocking member 40 may be disposed on a surface where the second through hole 2123 is disposed. After the filling member 30 is filled, the second through hole 2123 is blocked by the blocking member 40 .

[0162] The blocking member 40 may be connected to the second box wall 212 by welding, bolting, bonding, etc.

[0163] In some embodiments, the material of the blocking member 40 can be metal, plastic, etc.

[0164] The technical solution of the embodiment of the present application reduces the risk of leakage of the filling member 30 from the second accommodating cavity 232 by providing a blocking member 40 to block the second through hole 2123 , which helps to increase the weight of the battery device 1 .

[0165] Please refer to Figures 4 to 7 , and refer to Fig.10 , Fig.10 Schematic diagram of the second partition provided for some embodiments of the present application. In some embodiments, the box body 20 further includes a second partition 25, which is disposed in the first accommodating cavity 231, and the second partition 25 is connected to the first box wall 211 at both ends in the first direction Z, and divides the first accommodating cavity 231 into at least two second sub-accommodating cavities 2311 arranged along the second direction X, and the first direction Z is perpendicular to the second direction X.

[0166] In some embodiments, the first box wall 211 may have a fifth wall 2111 and a sixth wall 2112 , which are spaced apart from each other along the first direction Z, wherein the fifth wall 2111 is a wall facing the accommodating space 22 .

[0167] In some embodiments, the second partition 25 may be a plate-shaped member, one end of the second partition 25 is connected to the fifth wall 2111 , and the other end of the second partition 25 is connected to the sixth wall 2112 .

[0168] In some embodiments, the second separator 25 can be formed by rolling or stamping a metal plate. The second separator 25 can include multiple sections of plates connected in sequence, wherein the thickness direction of at least two sections of the plates is parallel to the first direction Z, wherein one section of the plates is connected to the inner wall surface of the fifth wall 2111, and another section of the plates is connected to the inner wall surface of the sixth wall 2112, and the second separator 25 also includes a plate section connecting the above two sections of the plates.

[0169] It should be noted that the inner wall surface of the fifth wall 2111 and the inner wall surface of the sixth wall 2112 may be the wall surfaces forming the first accommodating cavity 231 .

[0170] The connection method can be welding, bolt connection, etc.

[0171] In some embodiments, one second partition 25 can divide the first accommodation cavity 231 into two second sub-accommodation cavities 2311 arranged along the second direction X.

[0172] There may be a plurality of second partitions 25 , and the plurality of second partitions 25 may be arranged at intervals along the second direction X to divide the first accommodation cavity 231 into a plurality of second sub-accommodation cavities 2311 arranged along the second direction X.

[0173] In some embodiments, one second partition 25 can divide the first receiving cavity 231 into two second sub-receiving cavities 2311 arranged along the third direction Y.

[0174] The technical solution of the embodiment of the present application is to arrange the second partition 25 in the first accommodating cavity 231 to divide the first accommodating cavity 231 into at least two second sub-accommodating cavities 2311, that is, the two ends of the second partition 25 are respectively connected to the inner wall of the first accommodating cavity 231, which is beneficial to improve the strength of the first box wall 211.

[0175] Please refer to Figures 4 to 7 as well as Fig.10 In some embodiments, the second partition 25 is provided with a third through hole 251 , and the third through hole 251 penetrates two surfaces of the second partition 25 in the second direction X to connect two adjacent second sub-accommodating chambers 2311 .

[0176] In some embodiments, the number of the third through holes 251 may be plural, and the plurality of third through holes 251 may be arranged at intervals along the first direction Z, or the plurality of third through holes 251 may be arranged at intervals along the third direction Y.

[0177] The technical solution of the embodiment of the present application is to set a third through hole 251 in the second partition 25, so that the filling piece 30 can be filled into one of the second sub-accommodating cavities 2311, and the filling piece 30 can also be set in the other second sub-accommodating cavities 2311, which is conducive to improving the convenience of setting the filling piece 30.

[0178] An embodiment of the present application further provides an electrical device, comprising the battery device 1 of any of the above embodiments, wherein the battery device 1 is used to provide electrical energy to the electrical device.

[0179] In some embodiments, the electrical device may be a loader, excavator, crane, heavy construction machinery and other products. During normal use, in order to ensure that it maintains balance during operation and reduce shaking during operation, additional space is required to set up a counterweight block to increase the weight to maintain balance.

[0180] By arranging the filling piece 30 in the accommodating cavity 23, the weight of the battery device 1 is increased, and the increased weight of the battery device 1 replaces the counterweight, thereby saving space for increasing the weight of the electrical device.

[0181] Please refer to Figures 4 to 10 In some embodiments, the battery device 1 includes a box body 20 and a battery cell assembly 10 . The box body 20 includes a plurality of box walls 21 , and the plurality of box walls 21 enclose a receiving space 22 . The battery cell assembly 10 is disposed in the receiving space 22 .

[0182] The multiple box walls 21 include a bottom wall and multiple side walls, one end of each of the multiple side walls is arranged around the outer periphery of the bottom wall. A first accommodating cavity 231 is formed inside the bottom wall, and a second accommodating cavity 232 is formed inside the side wall. Two adjacent second accommodating cavities 232 are connected to each other, and multiple second accommodating cavities 232 are connected to the first accommodating cavity 231.

[0183] A second partition 25 is disposed in the first accommodating chamber 231 , and the second partition 25 divides the first accommodating chamber 231 into a plurality of second sub-accommodating chambers 2311 arranged in sequence.

[0184] A first partition 24 is disposed in the second accommodating cavity 232 , and the first partition 24 divides the second accommodating cavity 232 into a plurality of first sub-accommodating cavities 2323 arranged in sequence.

[0185] By arranging the first partition 24 in the second accommodating chamber 232, the second accommodating chamber 232 is divided into at least two first sub-accommodating chambers 2323, that is, the two ends of the first partition 24 are respectively connected to the inner wall of the second accommodating chamber 232, which is conducive to improving the strength of the second box wall 212. By arranging the second partition 25 in the first accommodating chamber 231, the first accommodating chamber 231 is divided into at least two second sub-accommodating chambers 2311, that is, the two ends of the second partition 25 are respectively connected to the inner wall of the first accommodating chamber 231, which is conducive to improving the strength of the first box wall 211.

[0186] In some embodiments, the battery device 1 further includes a filler 30 , which is a mixture of cement, resin and adhesive. The first accommodating cavity 231 and the plurality of second accommodating cavities 232 are both provided with the filler 30 .

[0187] A filling piece 30 is arranged in the accommodating cavity 23. When the box body 20 is subjected to external impact and the box wall 21 is deformed, the filling piece 30 can contact the two opposite box walls 21, and has a certain supporting effect on the box wall 21, which is conducive to improving the impact resistance of the box body 20, and is conducive to improving the strength of the box wall 21, thereby helping to improve the reliability of the battery device 1. At the same time, some electrical devices (such as loaders, excavators, cranes, etc.) need to be provided with additional counterweights to maintain balance during operation. When the battery device 1 is applied to the above-mentioned electrical devices, by providing a filling piece 30 in the accommodating cavity 23 of at least one box wall 21, it is conducive to increasing the weight of the battery device 1, thereby saving the space used for weight increase of the electrical device.

[0188] The first partition 24 is provided with a first through hole 241 to connect two adjacent first sub-accommodating chambers 2323 , and the second partition 25 is provided with a third through hole 251 to connect two adjacent second sub-accommodating chambers 2311 .

[0189] By providing the first through hole 241 in the first partition 24, when the filling piece 30 is filled into one of the first sub-accommodating cavities 2323, the filling piece 30 can also be provided in the other first sub-accommodating cavities 2323, which is conducive to improving the convenience of setting the filling piece 30. By providing the third through hole 251 in the second partition 25, when the filling piece 30 is filled into one of the second sub-accommodating cavities 2311, the filling piece 30 can also be provided in the other second sub-accommodating cavities 2311, which is conducive to improving the convenience of setting the filling piece 30.

[0190] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: The box body comprises a plurality of box walls, wherein the plurality of box walls enclose a containing space; A battery cell assembly is arranged in the accommodation space; The battery device further comprises a filler, a receiving cavity is formed inside the box wall, and the receiving cavity of at least one of the box walls is provided with the filler, and the density of the filler is 0.5 g / cm 3 ~5g / cm 3 .

2. The battery device according to claim 1, characterized in that: The density of the filler is 0.6 g / cm 3 ~3g / cm 3 .

3. The battery device according to claim 1, characterized in that: Each of the accommodating cavities is provided with the filling piece.

4. The battery device according to claim 1, characterized in that: The accommodating cavity includes a first accommodating cavity and a second accommodating cavity, the plurality of box walls include a first box wall and a plurality of second box walls, the first box wall has the first accommodating cavity formed inside, and the second box wall has the second accommodating cavity formed inside; In the first direction, one end of the plurality of second box walls is arranged around the outer periphery of the first box wall to define the accommodating space, the battery monomer assembly is supported by the first box wall, and the first direction is parallel to the thickness direction of the first box wall.

5. The battery device according to claim 4, characterized in that: Both ends of the second box wall are respectively provided with first openings communicating with the second accommodating cavity, and a plurality of the second box walls are connected end to end, and the first openings of two adjacent second box walls are communicated, so that two adjacent second accommodating cavities are communicated with each other.

6. The battery device according to claim 4, characterized in that: One end of the second box wall in the first direction has a second opening, and the second opening communicates the first accommodating cavity and the second accommodating cavity.

7. The battery device according to claim 4, characterized in that: The box body further includes a first partition, which is disposed in the second accommodating cavity and divides the second accommodating cavity into at least two first sub-accommodating cavities arranged along the first direction.

8. The battery device according to claim 7, characterized in that: The first partition is provided with a first through hole, and the first through hole penetrates two surfaces of the first partition in the first direction to connect two adjacent first sub-accommodation chambers.

9. The battery device according to claim 4, characterized in that: The second box wall has an inner surface facing the accommodating space and an outer surface away from the accommodating space, the inner surface is provided with a second through hole communicating with the second accommodating cavity; and / or the outer surface is provided with a second through hole communicating with the second accommodating cavity.

10. The battery device according to claim 9, characterized in that: The battery device further includes a blocking member, which is disposed on the second box wall and blocks the second through hole.

11. The battery device according to claim 4, characterized in that: The box body also includes a second partition, which is arranged in the first accommodating cavity, and the second partition is respectively connected to the first box wall at both ends in the first direction, and divides the first accommodating cavity into at least two second sub-accommodating cavities arranged along the second direction, and the first direction is perpendicular to the second direction.

12. The battery device according to claim 11, characterized in that: The second partition is provided with a third through hole, and the third through hole passes through two surfaces of the second partition in the second direction to connect two adjacent second sub-accommodation chambers.

13. An electrical device, characterized in that: It comprises the battery device as described in any one of claims 1 to 12, wherein the battery device is used to provide electrical energy to the electrical device.

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