Battery device and electric device

Abstract

The application belongs to the technical field of batteries, and particularly relates to a battery device and a power utilization device. The battery device comprises a box body and a battery monomer group arranged in a containing space of the box body. A connecting part fixed to the box body is further arranged in the containing space. The battery monomer group comprises a plurality of bag-type battery monomers. The bag-type battery monomer comprises an encapsulation bag and an electrode lead-out part. The electrode lead-out part is arranged on a first side wall of the encapsulation bag. The encapsulation bag further comprises a second side wall connected to the first side wall. The connecting part is arranged towards the second side wall of the encapsulation bag. The second side wall is arranged to extend to a limiting part relative to the connecting part. Part or all of the limiting part is inserted into the connecting part. The limiting part can be inserted and matched with the connecting part and be limited, so that the bag-type battery monomer can be more reliably fixed and connected with the box body through the connecting part. The shaking risk of the battery monomer group is reduced. The installation firmness and stability of the battery monomer group in the box body are improved. The overall strength and impact resistance of the battery device are improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery device and an electrical device. Background Technology

[0002] With the rise of new energy equipment, represented by new energy vehicles, battery devices have become a key power source.

[0003] In related technologies, battery devices typically include a housing and multiple battery cells housed within the housing, such as multiple prismatic or pouch-shaped battery cells. These battery cells are stacked in a specific order to form a battery cell assembly, which is then installed as a whole within the housing. To reduce the risk of movement within the battery cell assembly, bonding materials such as structural adhesive are filled into the gaps between adjacent battery cell assemblies and between the battery cell assembly and the housing walls to connect adjacent battery cell assemblies and between the battery cell assembly and the housing. However, current battery cells have relatively smooth outer surfaces, resulting in unreliable connections with the filling structure. The interface between the outer surface of the battery cell and the filling structure is prone to separation, leading to the battery cell assembly peeling off from the filling structure. This makes it difficult for the filling structure to provide effective connection, resulting in loose connections within the battery cell assembly and hindering the overall performance improvement of the battery device.

[0004] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Summary of the Invention

[0005] The purpose of this application is to provide a battery device and an electrical device to improve the installation stability and firmness of the battery cells in the housing.

[0006] The technical solution adopted in the embodiments of this application is:

[0007] In a first aspect, a battery device is provided, comprising:

[0008] The container has storage space;

[0009] At least one set of battery cells is installed in the receiving space. The battery cell set includes multiple pouch-type battery cells. Each pouch-type battery cell includes a packaging bag and an electrode lead-out portion extending from the packaging bag. The packaging bag includes a first sidewall and a second sidewall connected to the first sidewall. The electrode lead-out portion is disposed on the first sidewall.

[0010] The accommodating space is also provided with a connecting part fixed to the box body. At least a part of the second side wall is disposed opposite to the connecting part. A limiting part is provided on the second side wall extending opposite to the connecting part. At least a part of the limiting part is inserted into the connecting part.

[0011] The battery device according to this application embodiment includes a housing and at least one set of battery cells. The battery cell set is disposed within the housing's accommodating space, and a connecting portion fixed to the housing is also provided within the accommodating space. The battery cell set includes multiple pouch-shaped battery cells, each pouch-shaped battery cell including a packaging bag and an electrode lead-out portion extending from the side of the packaging bag. The electrode lead-out portion is disposed on a first side wall of the packaging bag, and the packaging bag also has a second side wall connected to the first side wall. The connecting portion is disposed facing the second side wall of the packaging bag, and a limiting portion extends from the second side wall relative to the connecting portion. Part or all of the limiting portion is inserted into the connecting portion. Thus, the limiting portion can connect and cooperate with the connecting portion to limit the movement, thereby improving the connection strength between the packaging bag of the pouch-shaped battery cell and the connecting portion. This allows the connecting portion to more effectively restrict the displacement of the pouch-shaped battery cell, and the battery cell set can achieve a more reliable fixed connection with the housing through the connecting portion. This reduces the risk of movement or shaking of the battery cell set, improves the installation firmness and stability of the battery cell set within the housing, and enhances the overall strength and impact resistance of the battery device.

[0012] In some embodiments, the end of the limiting portion away from the packaging bag is embedded in the connecting portion.

[0013] By adopting the technical solution of this embodiment, the end of the limiting part is embedded in the interior of the adjacent connecting part. The setting of the limiting part will not occupy the internal space of the box, thereby reducing the risk of the energy density of the battery device being reduced due to the setting of the limiting part.

[0014] In some embodiments, the second sidewall includes two first sealing portions that are spaced apart from each other along a first direction, the first sidewall is connected between the two first sealing portions, and at least one of the two first sealing portions is provided with a limiting portion.

[0015] By adopting the technical solution of this embodiment, a limiting part is provided on the side of the heat-sealing edge of the packaging bag. The limiting part can be integrally formed on the side of the aluminum-plastic film before the packaging bag is made. During sealing, the limiting part is simply retained on the side of the pre-reserved sealing position as an outward extending structure. The limiting part can be obtained without structural adjustment of the packaged bag after molding. The molding process of the limiting part is simple. At the same time, the setting of the limiting part does not affect the heat-sealing edge of the packaging bag and does not affect the sealing performance of the packaging bag.

[0016] In some embodiments, both first sealing portions are provided with limiting portions.

[0017] By adopting the technical solution of this embodiment, limiting parts and connecting parts are respectively provided on opposite sides of the packaging bag, so that both sides of the packaging bag are fixedly connected to the box body. The connecting parts limit the packaging bag, i.e., the battery cell group, from opposite sides, reducing the risk of the packaging bag moving and improving the installation firmness and stability of the battery cell group in the box body.

[0018] In some embodiments, the second sidewall further includes a second sealing portion, which is connected between two first sealing portions and is spaced apart from the first sidewall along a second direction. The second sealing portion is provided with a limiting portion, and the second direction is perpendicular to the first direction.

[0019] By adopting the technical solution of this embodiment, a limiting part is provided on the opposite side of the electrode lead-out part and fixedly connected to the box body through the connecting part, so that the connecting part can limit the packaging bag from two different directions, thereby further improving the installation firmness and stability of the battery cell assembly in the box body.

[0020] In some embodiments, the limiting portion provided on the first sealing edge portion is a strip-shaped portion extending along the second direction, and the opposite ends of the limiting portion are respectively connected to the first sidewall and the second sealing edge portion;

[0021] And / or, the limiting portion provided on the second sealing edge is a strip-shaped portion extending along the first direction, and the opposite ends of the limiting portion are respectively connected to the two first sealing edges.

[0022] By adopting the technical solution of this embodiment, the limiting part has sufficient size and area to connect with the connecting part, which can improve the connection stability and reliability between the limiting part and the connecting part. In addition, the connection force between the limiting part and the connecting part can also be evenly distributed along the length direction of the limiting part. The tensile force between the connecting part and the limiting part is dispersed, and the overall stress of the packaging bag is more uniform, which can reduce the risk of deformation or damage to the packaging bag due to concentrated tensile force.

[0023] In some embodiments, the connecting portion includes a plurality of first sub-parts spaced apart along a first direction, a battery cell group is disposed between two adjacent first sub-parts, and a limiting portion disposed on the first sealing edge is inserted into the corresponding first sub-part.

[0024] By adopting the technical solution of this embodiment, each battery cell group is respectively arranged between two adjacent first sub-parts. The two adjacent first sub-parts can simultaneously limit the same group of battery cells, thereby helping to further improve the installation stability of the battery cell group and reduce the risk of shaking.

[0025] In some embodiments, the battery device may include multiple sets of battery cells arranged sequentially along a first direction, a first sub-section is provided in the gap between two adjacent sets of battery cells along the first direction, and limiting portions of two adjacent first sealing portions of two adjacent pouch-shaped battery cells along the first direction are inserted into the same first sub-section.

[0026] By adopting the technical solution of this embodiment, along the first direction, two adjacent sets of battery cells can be fixedly connected to the housing through the same connecting part, which helps to simplify the internal structure of the housing and improve space utilization.

[0027] In some embodiments, the connecting portion further includes a second sub-portion disposed on the side of the second sealing portion along the second direction, the second sub-portion being connected to the first sub-portion, and a limiting portion disposed on the second sealing portion being inserted into the second sub-portion.

[0028] By adopting the technical solution of this embodiment, the same group of battery cells is confined within the space formed by the first sub-part and the second sub-part, and the connecting part surrounds at least three sides of the battery cell group. The installation firmness and reliability of the battery cell group are further improved. At the same time, the connecting part can also provide protection for the battery cell group from different sides.

[0029] In some embodiments, the battery device includes two sets of battery cells spaced apart along a second direction, and the connecting portion includes a second sub-portion disposed between the two sets of battery cells. The second sealing portions of the packaging bags of each pouch-type battery cell in the two sets of battery cells are disposed opposite to each other.

[0030] By adopting the technical solution of this embodiment, the two sets of battery cells can be connected and fixed to the housing along the second direction through the same second sub-part, which also helps to simplify the internal structure of the housing and improve space utilization.

[0031] In some embodiments, the second sub-part and the first sub-part are integrally formed.

[0032] By adopting the technical solution of this embodiment, the various parts of the connecting part are integrally connected without assembly. The connecting part itself has higher strength and better stability, thereby providing a more stable and reliable limit for the battery cell pack.

[0033] In some embodiments, the portion of the limiting portion inserted into the connecting portion has a cavity, and the portion of the connecting portion is embedded in the cavity.

[0034] By adopting the technical solution of this embodiment, a concave-convex fitting connection structure is formed between the connecting part and the limiting part, the connection strength between the limiting part and the connecting part is increased, the pull-out resistance is improved, and the risk of peeling at the connection interface between the two is reduced.

[0035] In some embodiments, the cavity includes a through hole provided in the limiting portion, and a portion of the connecting portion passes through the through hole.

[0036] By adopting the technical solution of this embodiment, by opening a through hole on the limiting part and setting a protrusion on the part of the connecting part corresponding to the through hole, the protrusion is adapted to pass into the through hole, and the two form a limiting fit structure similar to a pin, thereby improving the pull-out resistance between the limiting part and the connecting part and improving the connection strength between the limiting part and the connecting part.

[0037] In some embodiments, the portion of the limiting portion inserted into the connecting portion has a concave-convex folded edge structure, and the cavity includes a recess of the folded edge structure.

[0038] By adopting the technical solution of this embodiment, the contact area between the limiting part and the connecting part is increased, the connection strength between the two is improved, a concave-convex fit connection structure is formed between the limiting part and the connecting part, and the pull-out resistance between the two can also be increased.

[0039] In some embodiments, the packaging bag further includes two main walls connected between the first side wall and the second side wall, and multiple pouch-type battery cells of the same group of battery cells are stacked sequentially, with the main walls of two adjacent pouch-type battery cells arranged opposite each other along the arrangement direction, and the folded edge structure protruding along the direction intersecting with the main wall.

[0040] By adopting the technical solution of this embodiment, the space setting of the limiting structure and the limiting cooperation of the connecting part in the stacking direction of the battery cell pack can be fully utilized. The setting of the limiting part will not occupy too much internal space of the box, which helps to improve the energy density of the battery device.

[0041] In some embodiments, the outline of the folded edge structure is wavy or serrated.

[0042] In some embodiments, the cavity further includes a through hole, which is disposed in the folded structure, and / or the through hole is disposed in the limiting portion at a position between the folded structure and the second sidewall.

[0043] By adopting the technical solution of this embodiment, through holes are provided on the folded edge structure of the limiting part. The folded edge structure and the through holes cooperate with each other to provide more positions for connection with the connecting part, thereby improving the connection strength and pull-out resistance between the two.

[0044] In some embodiments, the connection is a concrete structural part.

[0045] By adopting the technical solution of this embodiment, the connecting part is a concrete structure part located in the accommodating space. The concrete structure has high structural strength, which can not only cooperate with the limiting part to effectively limit the packaging bag, i.e., the battery cell group, but also provide protection for the battery cell group from the side. In addition, the concrete structure has a large density, and setting it in the accommodating space can also increase the overall weight of the battery device, so that the battery device can be used as a counterweight structure to balance the center of gravity of heavy machinery, etc., thereby also taking into account the counterweight requirements of the battery device in the use scenarios of heavy machinery.

[0046] In some embodiments, at least the surface of the connector opposite to the second sidewall is provided with a first insulating layer.

[0047] In some embodiments, at least the portion of the limiting portion that is inserted into the connecting portion is an insulating portion, or the surface of at least the portion of the limiting portion that is inserted into the connecting portion is provided with a second insulating layer.

[0048] By adopting the technical solution of this embodiment, the limiting part and the connecting part can be electrically isolated, so that the connecting part can be electrically isolated from the adjacent pouch cell, thereby reducing the risk of short circuit.

[0049] In some embodiments, the connection is a cement concrete structural part.

[0050] In some embodiments, a protective component fixedly connected to the housing is also provided within the accommodating space, the battery cell pack is encapsulated within the protective component, at least a portion of the protective component forms a connecting part, and the protective component is a concrete structural component.

[0051] By adopting the technical solution of this embodiment, the protective component and the housing form a double protection for the battery cell pack. At the same time, more concrete can be filled into the internal space of the housing, increasing the overall weight and strength of the battery device. In addition, part of the protective component also serves as a connecting part to the limiting part on the packaging bag, so that the battery cell pack can be indirectly fixedly connected to the housing through the protective component, thereby improving the installation stability and firmness of the battery cell pack.

[0052] In some embodiments, the box includes a box body and a cover, with a receiving space provided in the box body, the box body having an opening through the receiving space, the cover being connected to the box body and adapted to cover the opening of the box body, at least a portion of the box body forming a connecting part, and the box body being a concrete structural member.

[0053] By adopting the technical solution of this embodiment, using concrete structure directly as the box structure, the high hardness and strong impact resistance of concrete structure can be fully utilized to provide physical protection for the internal structure, while also achieving the purpose of increasing the overall weight of the battery device, thus taking into account the weight requirements of the electrical equipment for the battery device.

[0054] In some embodiments, the box body is a one-piece molded concrete structural member, and at least a portion of the box body forms a connecting part.

[0055] In some embodiments, the connecting part is an adhesive part, which is bonded and fixed between at least a portion of the inner sidewall of the housing and the battery cell assembly.

[0056] Secondly, embodiments of this application also provide an electrical device, including the battery device as described in the above embodiments.

[0057] The power device in this embodiment adopts the battery device of the above embodiments, and therefore has at least all the beneficial effects of the above battery devices, which will not be repeated here.

[0058] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0059] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0061] Figure 2 This is an exploded view of a battery device in a related technology.

[0062] Figure 3 This is a schematic diagram of the structure of a pouch-type battery cell in related technologies.

[0063] Figure 4 Exploded view of the battery device provided for some embodiments of this application;

[0064] Figure 5 for Figure 4 A schematic diagram of the structure of a pouch-type battery cell in the battery device shown;

[0065] Figure 6 For along Figure 5 Sectional view of line AA in the middle;

[0066] Figure 7 A front view of the battery device provided in the embodiments of this application;

[0067] Figure 8 for Figure 4 The battery device shown is along Figure 7 Sectional view of the middle BB line;

[0068] Figure 9 for Figure 4 The battery device shown is along Figure 7 A cross-sectional view of the CC line;

[0069] Figure 10 Schematic diagram of the structure of a pouch-type battery cell for some other embodiments of the battery device provided in this application;

[0070] Figure 11 A schematic diagram of the structure of a pouch-type battery cell for a battery device provided in some further embodiments of this application;

[0071] Figure 12 Battery devices provided for other embodiments of this application along Figure 7 Sectional view of the middle BB line;

[0072] Figure 13 for Figure 4 The diagram shown is a structural schematic of the battery device with the lid open.

[0073] Figure 14 Battery devices provided for other embodiments of this application along Figure 7 A cross-sectional view of the CC line;

[0074] Figure 15 Battery devices provided for further embodiments of this application Figure 7 A cross-sectional view of the CC line.

[0075] The following are the labeling elements in the figure:

[0076] 100. Vehicle; 101. Controller; 102. Motor;

[0077] 200. Battery device;

[0078] 10. Box body; 1001. Storage space; 11. Box body; 12. Lid; 13. Connecting part; 131. First sub-part; 132. Second sub-part;

[0079] 20. Battery cell assembly; 21. Pouch-type battery cell; 211. Packaging bag; 211a. First sidewall; 211b. Second sidewall; 211c. Main wall; 2111. Limiting part; 2112. First sealing part; 2113. Second sealing part; 2114. Cavity; 2115. Through hole; 2116. Folded edge structure; 2117. Recess; 212. Electrode lead-out part;

[0080] 30. Protective components. Detailed Implementation

[0081] To make the technical problem to be solved, the technical solution and the beneficial effects of this application clearer, the following is in conjunction with the appendix. Figures 1 to 15 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

[0082] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0083] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0084] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least some of the embodiments of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments in any suitable manner.

[0085] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0086] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces). "Several" means one or more, unless otherwise explicitly specified.

[0087] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0088] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0089] In the description of the embodiments of this application, unless otherwise expressly specified and limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it may be directly connected to or indirectly connected to the other element.

[0090] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "proximity" refers to being close in location. For example, among three components A1, A2, and B, if the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1; that is, A2 is adjacent to B, or B is adjacent to A2. Similarly, when there are multiple components C, namely C1, C2, ... CN, if one component C, such as C2, is closer to component B than the other components C, then B is adjacent to C2, or C2 is adjacent to B.

[0091] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. In the field of heavy industrial machinery, to reduce energy consumption, heavy machinery is also gradually adopting battery devices to replace traditional energy sources.

[0092] A battery device typically includes a housing and a battery cell assembly housed within the housing. The battery cell assembly comprises multiple battery cells, such as multiple prismatic or pouch-shaped battery cells. These multiple battery cells are stacked and arranged in a specific order to form the battery cell assembly. The battery cell assembly is then installed and fixed as a single unit within the housing. To maintain the stability of the battery device's electrical performance, the battery cell assembly needs to be stably and securely installed within the housing, minimizing any significant displacement within the housing.

[0093] In related technologies, to improve the connection strength between adjacent battery cell groups and between battery cell groups and the casing walls, and to reduce the risk of battery cell groups shaking within the casing, bonding materials such as structural adhesive are filled into the gaps between adjacent battery cell groups and between battery cell groups and the casing walls to connect adjacent battery cell groups and battery cell groups to the casing. However, the outer surface of current battery cells is relatively smooth, resulting in low reliability of the connection between the battery cell and the filling structure. In some cases, the interface between the outer surface of the battery cell and the filling structure is prone to separation, causing the battery cell group to peel off from the filling structure. This makes it difficult for the filling structure to play an effective connection role, resulting in loose connections between battery cell groups and hindering the improvement of the overall performance of the battery device.

[0094] In some cases, taking a pouch-type battery cell as an example, it typically includes a packaging bag for encapsulating electrode components and electrolyte, as well as electrode leads extending from the packaging bag for output current. When pouch-type battery cells are installed in a housing, multiple pouch-type battery cells are connected into a battery cell group by limiting structures such as limiting plates. The battery cell group is then installed as a whole into the housing of the battery device. The gaps between adjacent battery cell groups, as well as the gaps between the battery cell group and the housing wall, are filled with bonding materials such as structural adhesive to improve the stability of the battery cell group installation in the housing and reduce the risk of shaking. However, the packaging bag of the pouch-type battery cell is usually made of a packaging film with a smooth surface, meaning the outer surface of the packaging bag of the pouch-type battery cell is smooth. As a result, the reliability of the connection between the packaging bag and the filling structure is not high. In some cases, the connection interface between the packaging bag and the filling structure of the pouch-type battery cell is easy to separate, resulting in the separation of the battery cell group from the filling structure. The filling structure cannot play an effective connection role, the battery cell group is loosely connected, and the overall performance of the battery device is difficult to improve.

[0095] Based on this, this application provides a battery device including a housing and at least one set of battery cells. The battery cells are disposed within the housing's accommodating space, and a connecting portion fixed to the housing is also provided within the accommodating space. The battery cells include multiple pouch-shaped battery cells, each pouch-shaped battery cell including a packaging bag and an electrode lead-out portion extending from the side of the packaging bag. The electrode lead-out portion is located on a first side wall of the packaging bag, and the packaging bag also has a second side wall connected to the first side wall. The connecting portion is disposed facing the second side wall of the packaging bag, and a limiting portion extends from the second side wall relative to the connecting portion. Part or all of the limiting portion is inserted into the connecting portion. Thus, the limiting portion can connect and cooperate with the connecting portion to limit the movement, thereby improving the connection strength between the packaging bag of the pouch-shaped battery cell and the connecting portion. This allows the connecting portion to more effectively restrict the displacement of the pouch-shaped battery cells, and the battery cells can achieve a more reliable fixed connection with the housing through the connecting portion. This reduces the risk of movement or shaking of the battery cells, improves the installation firmness and stability of the battery cells in the housing, and enhances the overall strength and impact resistance of the battery device.

[0096] The battery device provided in this application is applicable to electrical equipment that uses a battery device as a power source.

[0097] The electrical equipment can be vehicles, ships, or aircraft, etc. Vehicles can be used in the field of heavy industrial machinery, such as trucks, excavators, cranes, and tractors, or they can be passenger cars or commercial vehicles. This application does not impose any special limitations on the aforementioned electrical equipment.

[0098] For ease of explanation, an electrical device is provided in one embodiment of this application, which is illustrated using a vehicle as an example.

[0099] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 100 provided in some embodiments of this application. The vehicle 100 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, or they can be trucks, excavators, cranes, tractors, etc., or passenger cars, commercial vehicles, etc. A battery device 200 is provided inside the vehicle 100, and the battery device 200 can be located at the bottom, front, or rear of the vehicle 100. The battery device 200 can be used to power the vehicle 100; for example, the battery device 200 can serve as the operating power source for the vehicle 100. The vehicle 100 may also include a controller 101 and a motor 102. The controller 101 is used to control the battery device 200 to supply power to the motor 102, for example, to meet the power needs of the vehicle 100 during starting, navigation, and driving.

[0100] In some embodiments, the battery device 200 can not only serve as the operating power source for the vehicle 100, but also as the driving power source for the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0101] In some embodiments, the battery device 200 may be positioned at a suitable location on the vehicle 100 as needed to balance the weight of various parts of the vehicle 100.

[0102] Please refer to Figure 2 This application provides a battery device 200. The battery device 200 may include one or more battery cell groups 20 for providing voltage and capacity. The battery cell group 20 may include multiple pouch-type battery cells 21, which are connected in series, parallel, or mixed via a busbar.

[0103] In some embodiments, the battery cell group 20 is formed by arranging a plurality of pouch-type battery cells 21.

[0104] As an example, the battery cell pack 20 can be a battery module, which is formed by arranging and fixing multiple pouch-type battery cells 21 to form an independent module. As an example, the battery module can be formed by limiting plates to confine multiple pouch-type battery cells 21 within a space.

[0105] In some embodiments, the battery device 200 may be a battery pack, which includes a housing 10 and one or more battery cell groups 20, the battery cell groups 20 being housed in the housing 10.

[0106] As an example, the battery cell pack 20 can be a battery module, and the battery cell pack 20 can be housed in the housing 10 by fixing the battery module in the housing 10.

[0107] As an example, the battery cell pack 20 can also be housed in the housing 10 by directly fixing multiple pouch-type battery cells 21 to the housing 10.

[0108] In some embodiments, the housing 10 has an internal receiving space 1001 to accommodate the pouch-type battery cells 21. The housing 10 can be made of a material with a certain degree of hardness and strength, so that the housing 10 is not easily deformed when subjected to compression or impact, enabling the battery device 200 to have higher structural strength and improved reliability. The material of the housing 10 can be various, including but not limited to aluminum, stainless steel, aluminum alloy, iron, plastic, or concrete.

[0109] As an example, the housing 10 may include a first part and a second part, which are closed together to form a closed receiving space 1001 inside the housing 10 to accommodate the battery cell pack 20. Here, "closed" means covered or shut, and can be either sealed or unsealed. The first part and the second part may be the lid or the bottom plate of the housing 10, respectively. The first part and the second part may also be hollow structures, each open on one side, with the open side of the first part covering the open side of the second part.

[0110] As an example, the housing 10 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 the interior of the housing 10 forms an enclosed space to accommodate the battery cell pack 20.

[0111] In some embodiments, the housing 10 may be part of the vehicle's chassis structure. For example, a portion of the housing 10 may be at least a portion of the vehicle's floor, or a portion of the housing 10 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0112] In some embodiments, the pouch-type battery cell 21 can be a secondary battery cell, such as a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and this application embodiment does not limit this. The pouch-type battery cell 21 can be flat, cuboid, or other shapes, etc., and this application embodiment does not limit this either.

[0113] Please refer to Figure 3 , Figure 3 A schematic diagram of the structure of a pouch-type battery cell 21 provided for some embodiments of this application.

[0114] In some embodiments, the pouch-type battery cell 21 refers to a battery cell obtained by encapsulating the electrode assembly using a flexible packaging film (such as aluminum-plastic film) as the encapsulation film.

[0115] As an example, a flexible encapsulation film forms an encapsulation bag 211 through encapsulation. The interior of the encapsulation bag 211 forms a bag-shaped receiving space 1001, within which the electrode assembly and electrolyte are encapsulated. One or more sides of the encapsulation bag 211 also have electrode leads 212 for connection to external electrical components, such as connecting to the electrode leads 212 of other bag-shaped battery cells 21 via a busbar, thereby drawing out the current generated by the electrode assembly. The electrode assembly has tabs on one or both sides, with portions of the tabs extending out of the encapsulation bag 211 to form electrode leads 212. Alternatively, the tabs are connected to electrode leads, with portions of the electrode leads extending out of the encapsulation bag 211 to form electrode leads 212.

[0116] The following, in conjunction with the appendix Figures 2 to 15The battery device 200 of this application will be described in detail below with specific embodiments. In the embodiments of this application, the first direction is the direction shown by arrow F1 in the figure, the second direction is the direction shown by arrow F2 in the figure, and the third direction is the direction shown by arrow F3 in the figure.

[0117] Please see Figures 3 to 8 This application provides a battery device 200, which includes a housing 10 and at least one set of battery cell groups 20. The housing 10 has a receiving space 1001, and the battery cell groups 20 are installed in the receiving space 1001. The battery cell group 20 includes a plurality of pouch-type battery cells 21. Each pouch-type battery cell 21 includes a packaging bag 211 and an electrode lead-out portion 212 extending from the packaging bag 211. The packaging bag 211 includes a first side wall 211a and a second side wall 211b connected to the first side wall 211a. The electrode lead-out portion 212 is disposed on the first side wall 211a. The receiving space 1001 is also provided with a connecting portion 13 fixed to the housing 10. At least a portion of the second side wall 211b is disposed opposite to the connecting portion 13. The second side wall 211b extends opposite to the connecting portion 13 and is provided with a limiting portion 2111. At least a portion of the limiting portion 2111 is inserted into the connecting portion 13.

[0118] In the embodiments of this application, such as Figure 4 and Figure 8 As shown, the battery device 200 understandably includes a housing 10 and a battery cell assembly 20. The housing 10 has a receiving space 1001, which is a closed cavity that provides protection for the internal battery cell assembly 20. "Closed" can mean that the housing 10 is a sealed structure, preventing dust, moisture, etc., from entering the receiving space 1001, thus providing good physical and chemical protection for the internal battery cell assembly 20. Alternatively, "closed" can also mean not completely sealed. The housing 10 can be a one-piece structure or a structure formed by connecting multiple parts. For example, the housing 10 may include a main body and a cover plate, with the cover plate connected to the opening of the main body and forming the receiving space 1001 together with the main body.

[0119] Understandably, the battery device 200 includes one or more battery cell groups 20, each battery cell group 20 including a plurality of pouch-type battery cells 21, each pouch-type battery cell 21 including a packaging pouch 211 and an electrode lead-out portion 212 extending from at least one side of the packaging pouch 211. (Please refer to...) Figure 3The pouch-type battery cell 21 refers to a battery cell obtained by encapsulating the electrode assembly with a flexible packaging film (such as aluminum-plastic film). The flexible packaging film forms a packaging bag 211 by encapsulation. The inside of the packaging bag 211 forms a pouch-shaped containing space 1001. The electrode assembly and electrolyte are encapsulated in the pouch-shaped space. The electrode assembly has tabs on one or both sides. Part of the tab or part of the electrode lead connected to the tab extends from the side of the packaging bag 211 and forms an electrode lead 212. The electrode lead 212 is used to connect with external electrical components, thereby leading out the current generated by the electrode assembly.

[0120] Each pouch-type battery cell 21 has at least two electrode leads 212, namely, the electrode lead 212 includes at least one positive lead and at least one negative lead. The positive lead is part of the positive electrode tab of the electrode assembly inside the packaging pouch 211, or the positive lead is part of the electrode lead connected to the positive electrode tab of the electrode assembly. Similarly, the negative lead is part of the negative electrode tab of the electrode assembly inside the packaging pouch 211, or the negative lead is part of the electrode lead connected to the negative electrode tab of the electrode assembly.

[0121] The electrode lead-out portion 212 extends from the packaging bag 211. The positive and negative electrode leads can be drawn from the same side of the packaging bag 211, that is, the positive and negative electrode leads are located on the same side of the packaging bag 211. Alternatively, the positive and negative electrode leads can be located on different sides of the packaging bag 211. For example, when the pouch-type battery cell 21 adopts a wound electrode assembly, the electrode lead-out portion 212 can be located on two axial sides of the packaging bag 211, i.e., the positive electrode lead-out portion... The positive electrode leads out from one side of the axial direction of the packaging bag 211, and the negative electrode leads out from the opposite side. For example, when the bag-type battery cell 21 adopts a stacked electrode assembly, the electrode leads 212 can be provided on two sides in the length or width direction of the packaging bag 211, that is, the positive electrode leads out from one side in the length (or width) direction of the packaging bag 211, and the negative electrode leads out from the opposite side. Alternatively, the electrode leads 212 can also be provided on two adjacent sides of the packaging bag 211.

[0122] In the embodiments of this application, it will be understood that the following should be considered together with the embodiments of this application: Figure 3 , Figure 6 and Figure 7The packaging bag 211 includes a first sidewall 211a and a second sidewall 211b, which are circumferential sidewalls of the packaging bag 211. The packaging bag 211 also includes two opposing main walls 211c, which are sidewalls connecting the two main walls 211c from their circumferential edges. The circumferential sidewalls are sealed to the two main walls 211c to form a sealed bag-shaped space for accommodating the electrode assembly. As an example, the packaging bag 211 has a first main wall, a second main wall, and circumferential sidewalls surrounding them. The circumferential sidewalls include a first sidewall 211a and a second sidewall 211b connected to the first sidewall 211a. The first main wall and the second main wall are connected between the first sidewall 211a and the second sidewall 211b. In this design, the first sidewall 211a is a portion of the circumferential sidewall, and the second sidewall 211b is another portion of the circumferential sidewall. For example, the pouch-type battery cell 21 is rectangular in shape, and the circumferential sidewall includes four sidewalls connected to form an annular frame. One of the four sidewalls is the first sidewall 211a, and the remaining three are the second sidewalls 211b. Alternatively, two of the four sidewalls are the first sidewall 211a, and the other two are the second sidewalls 211b. Or, three of the four sidewalls are the first sidewall 211a, and the remaining one is the second sidewall 211b. That is, the first sidewall 211a and the second sidewall 211b can be planar walls or curved walls with corners.

[0123] The electrode lead-out portion 212 is disposed on the first sidewall 211a. For example, the packaging bag 211 includes a first sidewall 211a, and the positive electrode lead-out portion and the negative electrode lead-out portion are disposed on the same first sidewall 211a, that is, the positive electrode lead-out portion and the negative electrode lead-out portion are led out from the same side of the packaging bag 211. Figure 5 As shown; alternatively, the packaging bag 211 may also include two first sidewalls 211a, with the positive electrode lead and the negative electrode lead respectively disposed on the two first sidewalls 211a, that is, the positive electrode lead and the negative electrode lead are led out from two different sides of the packaging bag 211. For example, when the pouch-type battery cell 21 adopts a wound electrode assembly, the two opposite sidewalls of the packaging bag 211 along the axial direction of the electrode assembly are the first sidewalls 211a, and the positive electrode lead and the negative electrode lead are respectively disposed on two sides of the packaging bag 211 along the axial direction, that is, the positive electrode lead is led out from the two different sides of the packaging bag 211. The negative electrode lead-out portion extends from one side of the packaging bag 211, while the negative electrode lead-out portion extends from the opposite side of the packaging bag 211. For example, when the pouch-type battery cell 21 uses a stacked electrode assembly, the two sidewalls of the packaging bag 211 along its length or width direction are the first sidewalls 211a. The positive electrode lead-out portion and the negative electrode lead-out portion can be respectively located on the two sides of the packaging bag 211 along its length or width direction; that is, the positive electrode lead-out portion extends from one side of the packaging bag 211 along its length (or width) direction, and the negative electrode lead-out portion extends from the opposite side. Figure 3 As shown.

[0124] In the embodiments of this application, such as Figure 8 As shown, the accommodating space 1001 also includes a connecting portion 13 fixed to the housing 10. Understandably, the battery device 200 includes multiple pouch-type battery cells 21 installed within the housing 10. These pouch-type battery cells 21 are arranged sequentially to form a battery cell group 20. The side of the battery cell group 20 is provided with the connecting portion 13, allowing the battery cell group 20 to be connected and fixed to the housing 10 via the connecting portion 13. For example, there is an assembly gap between the battery cell group 20 and the side wall of the housing 10, and the connecting portion 13 is disposed between the side wall of the battery cell group 20 and the side wall of the housing 10; alternatively, multiple battery cell groups 20 are spaced apart within the accommodating space 1001, with an assembly gap between adjacent battery cell groups 20. The connecting portion 13 is disposed within this assembly gap and fixed to the housing 10, allowing the battery cell group 20 adjacent to the connecting portion 13 to be connected and fixed to the housing 10 via the connecting portion 13. The connection part 13 being fixed to the housing 10 means that the connection part 13 and the housing 10 form a stable whole, and the connection part 13 does not move relative to the housing 10.

[0125] As an example, the connecting part 13 and the housing 10 are integrally formed structures. For instance, the connecting part 13 can be directly the side wall of the housing 10, or the connecting part 13 can be a structural part such as a boss or rib formed directly on the inner side wall of the housing 10 through processes such as die casting, injection molding, casting, stamping, and extrusion. In this case, the connecting part 13 is part of the structure of the housing 10 itself. Alternatively, the connecting part 13 can also be a structural part fixedly connected to the housing 10. For example, it can be an adhesive such as a fluid sealant or structural adhesive, or a material such as concrete, into which fluid materials are injected into the assembly gap. The adhesive or concrete injected into the assembly gap will flow to form a tight connection with the inner wall of the housing 10. After it cures, it can fill the assembly gap and form a connection part 13 fixedly connected to the inner wall of the housing 10. For example, the connection part 13 is an adhesive part, that is, the connection part is a structural part formed by injecting adhesive into the housing 10. The connection part 13 is bonded and fixed between at least part of the inner wall of the housing 10 and the battery cell group 20; or, the connection part 13 can also be a structural part connected to the housing 10 by screwing, snapping, welding or fusion.

[0126] In this configuration, at least a portion of the second sidewall 211b of the packaging bag 211 of each pouch-type battery cell 21 is disposed opposite to the connecting portion 13. That is, the connecting portion 13 is disposed between the second sidewalls 211b of adjacent pouch-type battery cells 21, or the connecting portion 13 is disposed between the inner sidewall of the housing 10 and the second sidewall 211b of the adjacent pouch-type battery cell 21, or the connecting portion 13 is the inner sidewall of the housing 10 and disposed on the side of the second sidewall 211b of the adjacent pouch-type battery cell. This allows the packaging bag 211 of the pouch-type battery cell 21 to be limited by the friction between the second sidewall 211b and the connecting portion 13. The portion of the second sidewall 211b opposite to the connecting portion 13 can fit against the connecting portion 13, or there can be a small gap between them. Based on this, the second sidewall 211b extends relative to the connecting portion 13 and is provided with a limiting portion 2111. The limiting portion 2111 protrudes toward the connecting portion 13. Along the extending direction of the limiting portion 2111, part or all of the limiting portion 2111 is inserted into the connecting portion 13. Part or all of the limiting portion 2111 is wrapped by the connecting portion 13, so that the second sidewall 211b can also be connected and fixed to the connecting portion 13 by the limiting portion 2111.

[0127] As an example, a slot can be pre-reserved on the connecting part 13. When installing the battery cell assembly 20, the limiting part 2111 of the second sidewall 211b of each packaging bag 211 is inserted into the corresponding slot, so that the limiting part 2111 is inserted into the connecting part 13. Alternatively, when the connecting part 13 is a structural part formed by filling the assembly gap with adhesive or concrete, when the fluid adhesive or concrete is poured in, the limiting part 2111 can be wrapped by the flowing material. After the material solidifies, the limiting part 2111 can be inserted into the connecting part 13. Figure 8 As shown.

[0128] Thus, the battery device 200 of this application embodiment, by providing a connecting part 13 fixedly connected to the housing 10 within the accommodating space 1001 of the housing 10, the connecting part 13 is disposed opposite to the second side wall 211b of the packaging bag 211 of the pouch-type battery cell 21, and a limiting part 2111 is provided at the position of the second side wall 211b facing the connecting part 13, the limiting part 2111 is partially or completely inserted into the connecting part 13, and the limiting part 2111 can connect and cooperate with the connecting part 13 to limit, thereby improving the connection strength between the packaging bag 211 of the pouch-type battery cell 21 and the connecting part 13, thereby enabling the connecting part 13 to more effectively restrict the displacement of the pouch-type battery cell 21, and enabling the battery cell group 20 to achieve a more reliable fixed connection with the housing 10 through the connecting part 13, thereby reducing the risk of movement or shaking of the battery cell group 20, improving the installation firmness and stability of the battery cell group 20 within the housing 10, and improving the overall strength and impact resistance of the battery device 200.

[0129] In some embodiments, such as Figure 8 As shown, the end of the limiting part 2111 away from the packaging bag 211 is embedded in the connecting part 13.

[0130] In this embodiment, the end of the limiting part 2111 away from the packaging bag 211 is embedded inside the adjacent connecting part 13 without penetrating the connecting part 13. In this way, the setting of the limiting part 2111 will not occupy additional internal space of the housing 10, thereby reducing the risk of energy density reduction of the battery device 200 due to the setting of the limiting part 2111.

[0131] In some embodiments, such as Figures 5 to 8 As shown, the second sidewall 211b includes two first sealing portions 2112 that are spaced apart from each other along a first direction. The first sidewall 211a is connected between the two first sealing portions 2112, and at least one of the two first sealing portions 2112 is provided with a limiting portion 2111.

[0132] In this embodiment, the encapsulation bag 211 is heat-sealed using an encapsulation film such as aluminum-plastic film. After the electrode assembly is inserted into the encapsulation bag 211, the encapsulation film needs to be heat-sealed on two opposite sides of the electrode assembly. The position of this sealing edge is the first sealing edge 2112. The electrode lead-out part 212 extends from the position between the two first sealing edge parts 2112 to the outside of the encapsulation bag 211. The encapsulation bag 211 also needs to be heat-sealed on the side of the lead-out part 212, i.e., the first sidewall 211a, so that the encapsulation bag 211 as a whole forms a sealed bag structure. Two first sealing portions 2112 are arranged at intervals relative to each other along a first direction. For example, the electrode lead-out portion 212 extends from the side of the electrode assembly in the width direction, and the two first sealing portions 2112 are arranged on both sides along the length direction of the electrode assembly. The first direction is the length direction of the packaging bag 211. Or, for example, the electrode lead-out portion 212 extends from the side of the electrode assembly in the length direction, and the first sealing portions 2112 are arranged on both sides along the width direction of the electrode assembly. The first direction is the width direction of the packaging bag 211.

[0133] As an example, the packaging bag 211 is formed by folding a single sheet of aluminum-plastic film in half. After folding, two first sealing portions 2112 are formed by heat sealing on two sides adjacent to the fold line. These two first sealing portions 2112 are the second sidewalls 211b. An electrode lead-out portion 212 is led out on the other side opposite to the fold line and heat sealed. This sidewall is the first sidewall 211a.

[0134] As an example, the packaging bag 211 is formed by connecting two aluminum-plastic films. After punching a hole in the middle of one or both of the aluminum-plastic films, the circumferential edges of the two aluminum-plastic films are then attached to each other. The electrode lead-out part 212 is led out from the opposite sides of the punched hole. The two sides of the electrode lead-out part 212 are heat-sealed to form a first sidewall 211a. The two sides connected to the two first sidewalls 211a are heat-sealed to form two first sealing parts 2112, namely the second sidewalls 211b.

[0135] Thus, a limiting part 2111 is provided on the side of the heat-sealing edge of the packaging bag 211. The limiting part 2111 can be integrally formed on the side of the aluminum-plastic film before the packaging bag 211 is made. During sealing, the limiting part 2111 is simply retained on the side of the pre-reserved sealing position as an outward extending structure. The limiting part 2111 can be obtained without structural adjustment of the packaged bag 211 after molding. The molding process of the limiting part 2111 is simple. At the same time, the setting of the limiting part 2111 will not affect the heat-sealing edge of the packaging bag 211, and will not affect the sealing performance of the packaging bag 211.

[0136] In a specific embodiment, either of the two limiting parts 2111 is provided with a limiting part 2111, so that the packaging bag 211 can be fixedly connected to the box body 10 from one side through the connecting part 13.

[0137] Alternatively, in other embodiments, both limiting portions 2111 are provided with limiting portions 2111. Limiting portions 2111 are provided on opposite sides of the packaging bag 211 and connected to the connecting portion 13, so that both sides of the packaging bag 211 are fixedly connected to the housing 10. The connecting portion 13 limits the packaging bag 211, i.e., the battery cell group 20, from opposite sides, reducing the risk of the packaging bag 211 moving and improving the installation firmness and stability of the battery cell group 20 in the housing 10.

[0138] In other embodiments, such as Figure 5 , Figure 6 and Figure 9 As shown, the second sidewall 211b also includes a second sealing portion 2113, which is connected between the two first sealing portions 2112 and is spaced apart from the first sidewall 211a along the second direction. The second sealing portion 2113 is provided with a limiting portion 2111, and the second direction is perpendicular to the first direction.

[0139] In this embodiment, the packaging bag 211 is formed by connecting two aluminum-plastic films. After punching a hole in the middle of one or both of the aluminum-plastic films, the circumferential edges of the two aluminum-plastic films are then attached to each other. The electrode lead-out part 212 is led out from one side of the hole. The side of the electrode lead-out part 212 is heat-sealed to form a first sidewall 211a. The two sides connected to the first sidewall 211a are heat-sealed to form two first sealing parts 2112. The other side opposite to the electrode lead-out part 212, i.e. the first sidewall 211a, is also heat-sealed to form a second sealing part 2113. The two first sealing parts 2112 and the one second sealing part 2113 together form a second sidewall 211b. The second sealing portion 2113 can also be integrally formed with a limiting portion 2111 before the packaging bag 211 is made. The limiting portion 2111 is fixedly connected to the housing 10 from the opposite side of the electrode lead-out portion 212 through the connecting portion 13, thereby restricting the movement of the packaging bag 211 along the lead-out direction of the electrode lead-out portion 212. This allows the connecting portion 13 to limit the packaging bag 211 from two different directions (such as the length direction and the width direction), thereby further improving the installation firmness and stability of the battery cell assembly 20 in the housing 10.

[0140] In some embodiments, such as Figure 5 , Figure 6 and Figure 8 As shown, the limiting portion 2111 provided on the first sealing portion 2112 is a strip-shaped portion extending along the second direction, and the two opposite ends of the limiting portion 2111 are respectively connected to the first side wall 211a and the second sealing portion 2113.

[0141] In this embodiment, the limiting part 2111 has a certain length along the second direction, and its two opposite ends extend to connect with the first sidewall 211a and the second sealing part 2113, respectively. That is, the limiting part 2111 is set using the entire length of the first sealing part 2112. On the one hand, the limiting part 2111 has sufficient size and area to connect with the connecting part 13, which can improve the connection stability and reliability between the limiting part 2111 and the connecting part 13. On the other hand, the connection force between the limiting part 2111 and the connecting part 13 can also be evenly distributed along the length direction of the first sealing part 2112. The tensile force between the connecting part 13 and the limiting part 2111 is dispersed, and the overall stress on the packaging bag 211 is more uniform, which can reduce the risk of deformation or damage to the packaging bag 211 due to concentrated tensile force.

[0142] In some embodiments, such as Figure 5 , Figure 6 and Figure 9 As shown, the limiting portion 2111 provided on the second sealing portion 2113 is a strip-shaped portion extending along the first direction, and the two opposite ends of the limiting portion 2111 are respectively connected to the two first sealing portions 2112.

[0143] In this embodiment, the limiting part 2111 has a certain length along the first direction, and its two opposite ends extend to connect with the two first sealing parts 2112 respectively. That is, the limiting part 2111 is set using the entire length of the second sealing part 2113. The limiting part 2111 provided on the second sealing part 2113 also has sufficient size and area to connect with the connecting part 13, which can improve the connection stability and reliability between it and the connecting part 13. At the same time, the connection force between the limiting part 2111 provided on the second sealing part 2113 and the connecting part 13 can also be evenly distributed along the length direction of the second sealing part 2113. The tensile force between the connecting part 13 and the limiting part 2111 is dispersed, and the overall stress on the packaging bag 211 is more uniform, which can reduce the risk of deformation or damage to the packaging bag 211 due to concentrated tensile force.

[0144] In some embodiments, such as Figure 5 , Figure 6 , Figure 8 and Figure 10 and Figure 11 As shown, the portion of the limiting part 2111 that is inserted into the connecting part 13 has a cavity 2114, and the portion of the connecting part 13 is embedded in the cavity 2114.

[0145] In this embodiment, the limiting part 2111 is also provided with a cavity 2114, and a portion of the connecting part 13 can be embedded in the cavity 2114, thereby increasing the connection strength between the connecting part 13 and the limiting part 2111, improving the pull-out resistance, and reducing the risk of peeling at the connection interface between the two.

[0146] As an example, when the connecting part 13 is integrally cast using concrete or adhesive, the fluid concrete or adhesive can flow into the cavity 2114 and fill the cavity 2114 after curing.

[0147] It can be understood that the cavity 2114 can be a groove provided in the limiting part 2111, or it can be a through hole 2115 penetrating the limiting part 2111 along the thickness direction, or it can be a notch provided on the side of the limiting part 2111, etc.

[0148] In other examples, such as Figure 5 , Figure 6 and Figure 8 As shown, the portion of the limiting part 2111 that is inserted into the connecting part 13 is provided with a concave-convex folded edge structure 2116, and the cavity 2114 includes a recess 2117 of the folded edge structure 2116.

[0149] In this example, the end of the limiting portion 2111 away from the packaging bag 211 is folded and shaped once or multiple times to form a stable folded edge structure 2116. The folded edge structure 2116 has a convex portion and a concave portion 2117, i.e., a "peak" and a "valley". The concave portion 2117 can serve as a cavity 2114 for the connecting portion 13 to be partially embedded. Thus, by providing the folded edge structure 2116 in the limiting portion 2111, the connection strength between the limiting portion 2111 and the connecting portion 13 can be improved by increasing the contact area between the limiting portion 2111 and the connecting portion 13. At the same time, the limiting portion 2111 can also form a concave-convex fitting connection structure with the connecting portion 13, thereby increasing the pull-out resistance between the two.

[0150] Among them, the outline of the folded edge structure 2116 is wavy or sawtooth.

[0151] In a specific embodiment, such as Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown, the packaging bag 211 also includes two main walls 211c connected between the first side wall 211a and the second side wall 211b. Multiple pouch-shaped battery cells 21 of the same battery cell group 20 are stacked sequentially. The main walls 211c of two adjacent pouch-shaped battery cells 21 are arranged opposite each other along the arrangement direction. The folded edge structure 2116 protrudes along the direction intersecting with the main wall 211c.

[0152] In this embodiment, multiple pouch-shaped battery cells 21 of the same battery cell group 20 are stacked sequentially, for example, along a third direction perpendicular to the first and second directions. The folded edge structure 2116 extends along the stacking direction of the multiple pouch-shaped battery cells 21, for example, along the third direction. This allows full utilization of the space in the stacking direction of the battery cell group 20 to set the limiting structure and the connecting part 13 for limiting cooperation. The setting of the limiting part 2111 will not occupy too much of the internal space of the housing 10, which helps to improve the energy density of the battery device 200.

[0153] As an example, the folded edge structure 2116 is provided to protrude in a direction perpendicular to the main wall 211c.

[0154] In other examples, the cavity 2114 also includes a through hole 2115, which is located in the folded structure 2116.

[0155] That is, a through hole 2115 is provided on the folded structure 2116 of the limiting part 2111. The folded structure 2116 and the through hole 2115 provide more positions to connect and cooperate with the connecting part 13, thereby improving the connection strength and pull-out resistance between the two.

[0156] In other examples, such as Figure 10 As shown, unlike the example above, the cavity 2114 also includes a through hole 2115, which is located at the position of the limiting part 2111 between the folded structure 2116 and the second side wall 211b.

[0157] That is, the end of the limiting part 2111 cooperates with the connecting part 13 through the folded edge structure 2116. In the direction close to the packaging bag 211, the limiting part 2111 further cooperates with the connecting part 13 through the through hole 2115, thereby forming a segmented multi-structure connection between the limiting part 2111 and the connecting part 13, which can also effectively improve the connection strength and pull-out resistance between the limiting part 2111 and the connecting part 13.

[0158] In some examples, such as Figure 11 As shown, unlike the example above, the limiting part 2111 may not have the folded edge structure 2116, and the cavity 2114 may only include the through hole 2115 provided in the limiting part 2111, with part of the connecting part 13 passing through the through hole 2115.

[0159] In this example, by opening a through hole 2115 on the limiting part 2111, and providing a protrusion on the part of the connecting part 13 corresponding to the through hole 2115, the protrusion is adapted to pass into the through hole 2115, and the two form a limiting fit structure similar to a pin, thereby improving the pull-out resistance between the limiting part 2111 and the connecting part 13 and improving the connection strength between the limiting part 2111 and the connecting part 13.

[0160] In a specific embodiment, the portion of the limiting part 2111 that is inserted into the connecting part 13 is provided with multiple through holes 2115.

[0161] Of course, it is understandable that in other examples, the limiting part 2111 may not have the through hole 2115 and the folded edge structure 2116. The limiting part 2111 can be directly inserted into the connecting part 13 in a straight or bent state. The connecting part 13 can also limit each pouch-type battery cell 21 by clamping the limiting part 2111.

[0162] In some embodiments, such as Figure 8 and Figure 12 As shown, the connecting part 13 includes a plurality of first sub-parts 131 spaced apart along a first direction, the battery cell group 20 is disposed between two adjacent first sub-parts 131, and the limiting part 2111 disposed on the first sealing part 2112 is inserted into the corresponding first sub-part 131.

[0163] In this embodiment, along the first direction, each battery cell group 20 is respectively disposed between two adjacent first sub-parts 131. The two first sealing edges 2112 of the packaging bag 211 of each pouch-type battery cell 21 are provided with limiting parts 2111. The limiting parts 2111 on the two first sealing edges 2112 are respectively inserted into the corresponding first sub-parts 131 along the first direction. The two adjacent first sub-parts 131 can simultaneously limit the same group of battery cell groups 20, thereby helping to further improve the installation stability of the battery cell group 20 and reduce the risk of shaking.

[0164] In some embodiments, such as Figure 9 As shown, the connecting portion 13 also includes a second sub-portion 132 disposed on the side of the second sealing portion 2113 along the second direction. The second sub-portion 132 is connected to the first sub-portion 131, and the limiting portion 2111 disposed on the second sealing portion 2113 is inserted into the second sub-portion 132.

[0165] In this embodiment, along the second direction, the connecting portion 13 further includes a second sub-portion 132 disposed on one side of the battery cell assembly 20. The second sub-portion 132 is disposed opposite to the second sealing portion 2113 of the packaging bag 211. The limiting portion 2111 on the second sealing portion 2113 is inserted into the second sub-portion 132. The second sub-portion 132 is connected to the first sub-portion 131, so that the same group of battery cell assemblies 20 is limited within the space formed by the first sub-portion 131 and the second sub-portion 132. The connecting portion 13 surrounds at least three sides of the battery cell assembly 20, further improving the installation firmness and reliability of the battery cell assembly 20. At the same time, the connecting portion 13 can also provide protection for the battery cell assembly 20 from different sides.

[0166] In some examples, such as Figure 8 and Figure 9As shown, the battery device 200 includes a group of battery cells 20. The connecting part 13 includes two first sub-parts 131 and one second sub-part 132. The two first sealing edges 2112 of the packaging bag 211 of each pouch-type battery cell 21 are provided with limiting parts 2111. The limiting parts 2111 provided on the first sealing edges 2112 are inserted into the corresponding first sub-parts 131. The second sealing edges 2113 of the packaging bag 211 are also provided with limiting parts 2111. The limiting parts 2111 provided on the second sealing edges 2113 are inserted into the second sub-part 132. The second sub-part 132 is vertically connected between the two first sub-parts 131.

[0167] In other examples, such as Figure 12 As shown, the battery device 200 may also include multiple sets of battery cell groups 20 arranged sequentially along the first direction. A first sub-part 131 is provided in the gap between two adjacent sets of battery cell groups 20 along the first direction. The limiting part 2111 of two adjacent first sealing parts 2112 of two adjacent pouch-shaped battery cells 21 along the first direction is inserted into the same first sub-part 131.

[0168] That is, the battery device 200 includes multiple sets of battery cell groups 20, which are arranged sequentially along a first direction. There is an assembly gap between two adjacent sets of battery cell groups 20. A first sub-part 131 is disposed in the assembly gap between two adjacent sets of battery cell groups 20. For example, there is an assembly gap between the side wall of the housing 10 and the adjacent battery cell group 20, and there is an assembly gap between two adjacent sets of battery cell groups 20. Multiple first sub-parts 131 are filled in each assembly gap in a one-to-one correspondence.

[0169] Thus, the first sub-section 131 located between two adjacent battery cell groups 20 has its two side walls along the first direction facing one battery cell group 20 respectively. The limiting parts 2111 on the first sealing edge parts 2112 on both sides of the first sub-section 131 are inserted into the first sub-section 131, so that the two adjacent battery cell groups 20 can be fixedly connected to the housing 10 through the same connecting part 13, which helps to simplify the internal structure of the housing 10 and improve space utilization.

[0170] In other examples, the battery device 200 may also include two sets of battery cell groups 20 spaced apart along a second direction, the connecting portion 13 includes a second sub-portion 132 disposed between the two sets of battery cell groups 20, and the second sealing portions 2113 of the packaging bags 211 of each pouch-type battery cell 21 of the two sets of battery cell groups 20 are disposed opposite to each other.

[0171] In this embodiment, the second sealing portions 2113 of the packaging bags 211 of the two sets of battery cell groups 20 are arranged opposite to each other, and a second sub-part 132 is provided in the gap between the two sets of battery cell groups 20. The limiting portions 2111 on the second sealing portions 2113 of the two sets of battery cell groups 20 are connected and fixed to the same second sub-part 132, so that the two sets of battery cell groups 20 can be connected and fixed to the housing 10 along the second direction through the same second sub-part 132. This also helps to simplify the internal structure of the housing 10 and improve space utilization.

[0172] In some embodiments, such as Figure 8 , Figure 9 and Figure 12 As shown, the second sub-part 132 and the first sub-part 131 are integrally formed structures.

[0173] In this embodiment, the connecting part 13 is an integrally formed structural part, and its various parts are connected as a whole without assembly. The connecting part 13 itself has higher strength and better stability, thereby providing a more stable and reliable limit for the battery cell pack 20.

[0174] As an example, the connecting part 13 can be integrally cast using fluid materials such as concrete or sealant, or the connecting part 13 can be integrally formed using processes such as injection molding, die casting or stamping.

[0175] In some embodiments, the connecting part 13 is a concrete structural part.

[0176] In this embodiment, the connecting part 13 is a concrete structure provided in the accommodating space 1001. The concrete structure has high structural strength, which can not only cooperate with the limiting part 2111 to effectively limit the packaging bag 211, i.e., the battery cell group 20, but also provide protection for the battery cell group 20 from the side. In addition, the concrete structure has a large density. Setting it in the accommodating space 1001 can also increase the overall weight of the battery device 200, so that the battery device 200 can be used as a counterweight structure to balance the center of gravity of heavy machinery, etc., and thus can also meet the counterweight requirements of the battery device 200 in the use scenarios of heavy machinery, etc.

[0177] The concrete structural component refers to a composite material structural component in which aggregates are bound together by a cementing material. Depending on the cementing material, concrete can include cement concrete, gypsum concrete, silicate concrete, water glass concrete, asphalt concrete, polymer concrete, etc. For example, cement concrete uses cement as the cementing material, sand and gravel as aggregates, and water (which may contain admixtures and additives) in a certain proportion, mixed to obtain concrete. Concrete structures have a simple manufacturing process, low cost, and high structural strength and weight. As an example, the connection part 13 can be a cement concrete structural component. Cement concrete is readily available, low in cost, and has high structural strength and density, meeting usage requirements.

[0178] In some embodiments, at least the surface of the connecting portion 13 opposite to the second sidewall 211b is provided with a first insulating layer.

[0179] In this embodiment, at least the surface of the connecting part 13 opposite to the second sidewall 211b is provided with a first insulating layer. The connecting part 13 is a concrete structural component. In actual applications, it may have a metal reinforcement structure inside, or it may have metal debris mixed in. The first insulating layer is provided on the surface of the second sidewall 211b of the connecting part 13 facing the packaging bag 211. The first insulating layer can act as an insulating protective barrier to electrically isolate the connecting part 13 from the packaging bag 211, thereby reducing the risk of short circuit.

[0180] It can be understood that the provision of a first insulating layer on at least the surface of the connecting portion 13 opposite to the second sidewall 211b means that the first insulating layer may be provided only on the surface facing the second sidewall 211b, or the first insulating layer may be provided on all other surfaces, such as the first insulating layer covering the entire outer surface of the connecting portion 13.

[0181] In other embodiments, at least the portion of the limiting portion 2111 that is inserted into the connecting portion 13 is an insulating portion, or the surface of at least the portion of the limiting portion 2111 that is inserted into the connecting portion 13 is provided with a second insulating layer.

[0182] In this embodiment, at least the portion of the limiting part 2111 that is inserted into the connecting part 13 is an insulating part, so that the inserted portion of the limiting part 2111 can be electrically isolated from the connecting part 13. Alternatively, a second insulating layer is provided on the surface of the insertion portion 13 of the limiting part 2111. The second insulating layer can act as an insulating protective barrier to electrically isolate the connecting part 13 from the limiting part 2111. In this way, the connecting part 13 of the concrete structure and the adjacent pouch cell 21 can also be effectively electrically isolated, reducing the risk of short circuit.

[0183] Understandably, the provision of a second insulating layer on the surface of at least the portion of the limiting part 2111 that inserts into the connecting part 13 means that the second insulating layer can be provided only on the surface of the portion inside the inserting connecting part 13 of the limiting part 2111, or it can be provided on the entire outer surface of the limiting part 2111, i.e., the second insulating layer covers the entire outer surface of the limiting part 2111. The statement that at least the portion of the limiting part 2111 that inserts into the connecting part 13 is an insulating part means that a portion of the inserting connecting part 13 of the limiting part 2111 is an insulating part, or the entire limiting part 2111 is an insulating part; for example, the limiting part 2111 can be made of an insulating material.

[0184] Understandably, in other embodiments, a first insulating layer may also be provided on at least the surface of the connecting portion 13 opposite to the second sidewall 211b, and at least the portion of the limiting portion 2111 inserted into the connecting portion 13 may be provided as an insulating portion, or a second insulating layer may be provided on the surface of at least the portion of the limiting portion 2111 inserted into the connecting portion 13.

[0185] In some embodiments, such as Figure 4 , Figure 8 , Figure 9 and Figure 13 As shown, the accommodating space 1001 is also provided with a protective component 30 fixedly connected to the box 10. The battery cell group 20 is encapsulated in the protective component 30. At least a part of the protective component 30 forms a connecting part 13. The protective component 30 is a concrete structural component.

[0186] In this embodiment, a concrete structural component is installed inside the housing space 1001 to encapsulate the battery cell assembly 20. After the protective component 30 is formed, it can wrap the battery cell assembly 20 inside the housing space 1001, so that the battery cell assembly 20 can be stably and reliably installed inside the housing 10. The protective component 30 and the housing 10 form a double protection for the battery cell assembly 20. At the same time, more concrete can be filled into the internal space of the housing space 1001, which can increase the overall weight and strength of the battery device 200.

[0187] In this embodiment, during molding, all structures except the protective component 30 inside the receiving space 1001 are installed and fixed within the receiving space 1001. Then, concrete slurry is injected into the receiving space 1001 using a casting process. The concrete slurry fills the gaps within the receiving space 1001 and encapsulates the battery cell assembly 20. After the slurry solidifies, the battery cell assembly 20 is encapsulated within the protective component 30, meaning the protective component 30 can be integrally cast within the receiving space 1001. Here, "encapsulation" means that the battery cell assembly 20, as a whole, is contained, fixed, and sealed inside the protective component 30, which provides good physical and chemical protection for the internal battery cell assembly 20.

[0188] In this embodiment, the connecting part 13 is provided on the protective member 30. For example, the protective member 30 supports the inner sidewall of the battery cell assembly 20 to form the connecting part 13. The inner sidewall of the protective member 30 is attached to the side of the battery cell assembly 20, and provides support for the battery cell assembly 20 by fitting together. In addition, the inner sidewall of the protective member 30 also serves as the connecting part 13 and is connected to the limiting part 2111 on the packaging bag 211, so that the battery cell assembly 20 can be indirectly fixedly connected to the box 10 through the protective member 30, thereby improving the installation stability and firmness of the battery cell assembly 20.

[0189] Understandably, when a set of battery cell groups 20 is provided inside the accommodating space 1001, there is an assembly gap between the side wall of the housing 10 and the second side wall 211b of the battery cell group 20. When the concrete protective component 30 is cast, the concrete fills the assembly gap and forms the connection part 13, that is, the connection part 13 is the inner side wall of the protective component 30. Alternatively, when multiple sets of battery cell groups 20 are spaced apart inside the accommodating space 1001, in addition to filling the connection part 13 between each battery cell group 20 and the side wall of the housing 10, that is, in addition to the inner side wall of the protective component 30, the concrete also fills the assembly gap between two adjacent sets of battery cell groups 20 and forms the connection part 13. That is, the connection part 13 also includes other structural parts other than the inner side wall of the protective component 30.

[0190] In a specific embodiment, such as Figure 4 , Figure 8 , Figure 9 and Figure 13 As shown, the housing 10 may include a main body 11 and a cover 12. A protective element 30 is disposed within the receiving space 1001 formed by the main body 11 and the cover 12. The main body 11 and the cover 12 provide external protection for the protective element 30 and the battery cell assembly 20. The main body 11 and the cover 12 may be made of materials such as metal or plastic.

[0191] In other embodiments, unlike the embodiments described above, such as Figure 14 As shown, the box 10 includes a box body 11 and a cover 12. A receiving space 1001 is provided in the box body 11. The box body 11 has an opening that passes through the receiving space 1001. The cover 12 is connected to the box body 11 and is adapted to cover the opening of the box body 11. At least a portion of the box body 11 forms a connecting part 13. The box body 11 is a concrete structural component.

[0192] In this embodiment, the housing 10 consists of two parts: a main body 11 and a cover 12. The main body 11 is the main part of the housing 10, and it has an internal accommodating space 1001. The main body 11 has an opening that passes through the accommodating space 1001, through which battery cells 20 and other components can be installed. The opening also allows for maintenance and replacement of components within the accommodating space 1001 when needed. For example, the electrode leads 212 of the pouch-type battery cell 21 can be aligned with the opening of the main body 11, and the electrode leads 212 can be connected through the opening. The cover 12 is connected to the main body 11 and can be fitted to seal the opening of the main body 11, thereby sealing the accommodating space 1001 and reducing the risk of external dust, moisture, and other impurities entering the accommodating space 1001 through the opening. The cover 12 and the main body 11 can be connected by screws, snaps, or fasteners.

[0193] In this embodiment, the main body 11 of the box is a concrete structural component. Using concrete structure directly as the box structure can make full use of the high hardness and strong impact resistance of concrete structure to provide physical protection for the internal structure. At the same time, it can also increase the overall weight of the battery device 200 and take into account the counterweight requirements of the electrical equipment on the battery device 200.

[0194] The connecting part 13 is provided on the main body 11 of the box. For example, the connecting part 13 includes the inner side wall of the main body 11 supporting the battery cell group 20. That is, the inner side wall of the main body 11 is connected to the limiting part 2111 on the packaging bag 211 as the connecting part 13, so that the battery cell group 20 can be directly fixedly connected to the main body 11 of the box.

[0195] Understandably, when a set of battery cell groups 20 is provided inside the accommodating space 1001, each side wall of the battery cell group 20 is directly opposite to the inner side wall of the box body 11. After the box body 11 is formed, the inner side wall of the box body 11 can be directly connected to the corresponding limiting part 2111 as the connecting part 13. When multiple sets of battery cell groups 20 are arranged at intervals inside the accommodating space 1001, in addition to the inner side walls of the box body 11, concrete also fills the assembly gap between two adjacent sets of battery cell groups 20 and forms the connecting part 13. That is, the connecting part 13 also includes other structural parts other than the inner side walls of the box body 11.

[0196] In this embodiment, the main body 11 is integrally cast from concrete. When manufacturing the main body 11, a mold adapted to the structure and size of the main body 11 is first provided. The structure of the battery cell group 20 and the like is fixed inside the mold. Then, concrete slurry is poured into the mold. After the concrete slurry solidifies, the mold is removed to form the main body 11. The inner sidewall of the main body 11, which wraps around the outside of the battery cell group 20, forms a connecting part 13. The fluid concrete can flow and wrap around the limiting part 2111. After the main body 11 solidifies, the limiting part 2111 can be inserted into the corresponding connecting part 13. When multiple battery cell groups 20 are provided inside the accommodating space 1001, during the manufacturing process, the concrete slurry will flow to fill the gap between adjacent battery cell groups 20, thereby forming a connecting part 13 between two adjacent battery cell groups 20.

[0197] In this embodiment, it can be understood that the cover 12 may be made of concrete, just like the box body 11, or the cover 12 may be made of metal or plastic or other materials.

[0198] In other embodiments, unlike the embodiments described above, such as Figure 15 As shown, the box body 10 is a one-piece molded concrete structural component, and at least a portion of the box body 10 forms a connecting part 13.

[0199] In this embodiment, the housing 10 is an integral concrete structure. When manufacturing the battery device 200, a mold adapted to the structure and dimensions of the housing 10 is first provided. Other structures, such as the battery cell assembly 20, are fixed inside the mold. Then, concrete slurry is poured into the mold. After the concrete slurry solidifies, the mold is removed to produce the housing 10. In actual production, by designing the shape and dimensions of the mold, a housing 10 with the corresponding shape and size can be obtained. By controlling the relative position of the battery cell assembly 20 within the mold, the battery cell assembly 20 can be encapsulated inside the housing 10.

[0200] In this embodiment, the connecting part 13 is provided on the housing 10. For example, the connecting part 13 includes the inner sidewall of the housing 10 supporting the battery cell group 20. When the battery device 200 includes a group of battery cell groups 20, a portion of the sidewall of the housing 10 is provided facing the second sidewall 211b of the packaging bag 211, and the connecting part 13 includes the portion of the housing 10 facing the second sidewall 211b. Alternatively, when the battery device 200 includes multiple groups of battery cell groups 20 arranged at intervals, the connecting part 13 includes the inner sidewall of the housing 10 supporting the battery cell group 20. At the same time, the connecting part 13 may also include a protrusion provided between two adjacent groups of battery cell groups 20 and protruding from the bottom surface of the housing 10.

[0201] Another embodiment of this application also provides an electrical device, such as... Figure 1 As shown, it includes a battery device 200 as provided in any of the above embodiments, the battery device 200 being used to provide electrical energy.

[0202] The power device in this embodiment, since it adopts the battery device 200 of any of the above embodiments, has at least all the beneficial effects of the battery device 200, which will not be repeated here.

[0203] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0204] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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 container has storage space; At least one set of battery cells is installed in the receiving space. The battery cell set includes multiple pouch-shaped battery cells. Each pouch-shaped battery cell includes a packaging bag and an electrode lead-out portion extending from the packaging bag. The packaging bag includes a circumferential sidewall and two opposing main walls. The circumferential sidewall surrounds the main walls and connects the two main walls from the circumferential edge of the main walls. The circumferential sidewall includes a first sidewall and a second sidewall connected to the first sidewall. The electrode lead-out portion is disposed on the first sidewall. The accommodating space is further provided with a connecting part fixed to the box body. At least a portion of the second side wall is disposed opposite to the connecting part. A limiting part extends from the second side wall relative to the connecting part, and at least a portion of the limiting part is inserted into the connecting part.

2. The battery device according to claim 1, characterized in that: The end of the limiting part away from the packaging bag is embedded in the connecting part.

3. The battery device according to claim 1, characterized in that: The second sidewall includes two first sealing portions that are spaced apart from each other along a first direction. The first sidewall is connected between the two first sealing portions, and at least one of the two first sealing portions is provided with the limiting portion.

4. The battery device according to claim 3, characterized in that: Both of the first edge sealing portions are provided with the limiting portion.

5. The battery device according to claim 3, characterized in that: The second sidewall also includes a second sealing portion, which is connected between the two first sealing portions and is spaced apart from the first sidewall along a second direction. The second sealing portion is provided with the limiting portion, and the second direction is perpendicular to the first direction.

6. The battery device according to claim 5, characterized in that: The limiting portion located on the first edge sealing portion is a strip-shaped portion extending along the second direction, and the opposite ends of the limiting portion are respectively connected to the first sidewall and the second edge sealing portion; And / or, the limiting portion provided on the second edge sealing portion is a strip-shaped portion extending along the first direction, and the opposite ends of the limiting portion are respectively connected to the two first edge sealing portions.

7. The battery device according to claim 5, characterized in that: The connecting portion includes a plurality of first sub-parts spaced apart along the first direction, the battery cell group is disposed between two adjacent first sub-parts, and the limiting portion disposed on the first sealing portion is inserted into the corresponding first sub-part.

8. The battery device according to claim 7, characterized in that: The battery device includes multiple sets of battery cell groups arranged sequentially along the first direction. A first sub-section is provided in the gap between two adjacent sets of battery cell groups along the first direction. The limiting portions of two adjacent first sealing portions of two adjacent pouch-shaped battery cells along the first direction are inserted into the same first sub-section.

9. The battery device according to claim 7, characterized in that: The connecting portion further includes a second sub-portion disposed on the side of the second sealing portion along the second direction. The second sub-portion is connected to the first sub-portion, and the limiting portion disposed on the second sealing portion is inserted into the second sub-portion.

10. The battery device according to claim 9, characterized in that: The battery device includes two sets of battery cell groups spaced apart along a second direction. The connecting portion includes a second sub-portion located between the two sets of battery cell groups. The second sealing portions of the packaging bags of each pouch-type battery cell in the two sets of battery cell groups are arranged opposite to each other.

11. The battery device according to claim 9, characterized in that: The second sub-part and the first sub-part are integrally formed.

12. The battery device according to claim 1, characterized in that: The portion of the limiting part that is inserted into the connecting part has a cavity, and the portion of the connecting part is embedded in the cavity.

13. The battery device according to claim 12, characterized in that: The cavity includes a through hole provided in the limiting part, and a portion of the connecting part passes through the through hole.

14. The battery device according to claim 12, characterized in that: The portion of the limiting part that is inserted into the connecting part has a concave-convex folded edge structure, and the cavity includes the concave portion of the folded edge structure.

15. The battery device according to claim 14, characterized in that: The packaging bag also includes two main walls connected between the first side wall and the second side wall. Multiple pouch-shaped battery cells of the same group of battery cells are stacked sequentially. The main walls of two adjacent pouch-shaped battery cells along the arrangement direction are arranged opposite each other. The folded edge structure protrudes along the direction intersecting with the main wall.

16. The battery device according to claim 14, characterized in that: The outline of the folded edge structure is wavy or sawtooth-shaped.

17. The battery device according to claim 14, characterized in that: The cavity further includes a through hole, which is disposed in the folded edge structure, and / or, the through hole is disposed in the limiting portion at a position between the folded edge structure and the second sidewall.

18. The battery device according to any one of claims 1 to 17, characterized in that: The connecting part is a concrete structural part.

19. The battery device according to claim 18, characterized in that: The connecting portion has at least one insulating layer on the surface opposite to the second sidewall.

20. The battery device according to claim 18, characterized in that: The portion of the limiting part that is inserted into the connecting part is an insulating part, or the surface of the portion of the limiting part that is inserted into the connecting part is provided with a second insulating layer.

21. The battery device according to claim 18, characterized in that: The connecting part is a cement concrete structural part.

22. The battery device according to claim 18, characterized in that: The accommodating space is also provided with a protective component fixedly connected to the box body. The battery cell pack is encapsulated in the protective component. At least a portion of the protective component forms the connecting part. The protective component is a concrete structural component.

23. The battery device according to claim 18, characterized in that: The box includes a main body and a cover. The accommodating space is located in the main body. The main body has an opening that passes through the accommodating space. The cover is connected to the main body and is adapted to cover the opening of the main body. At least a portion of the main body forms the connecting part. The main body is a concrete structural component.

24. The battery device according to claim 18, characterized in that: The box body is a one-piece molded concrete structural component, and at least a portion of the box body forms the connecting part.

25. The battery device according to any one of claims 1 to 17, characterized in that: The connecting part is an adhesive part, which is bonded and fixed between at least a portion of the inner sidewall of the housing and the battery cell assembly.

26. An electrical appliance, characterized in that: Includes the battery device as described in any one of claims 1 to 25, the battery device being used to provide electrical energy.

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