Battery cell, battery device and electric device

Abstract

A battery cell (20), a battery device (100), and an electric device. The battery cell (20) comprises a casing (25), an electrode assembly (26) and a terminal assembly (21). The casing (25) has two first side walls (251) opposite each other, wherein the area of the first side walls (251) is greater than the area of the other side walls, and the two first side walls (251) are arranged opposite each other in a first direction; the electrode assembly (26) is arranged in the casing (25); and the terminal assembly (21) comprises a first terminal (23) and a second terminal (24) having opposite polarities, wherein the first terminal (23) and the second terminal (24) are both electrically connected to the electrode assembly (26) and are respectively arranged on the two first side walls (251), and the first terminal (23) is configured to be capable of being inserted into the second terminal (24) of another adjacent battery cell (20), such that the two adjacent battery cells (20) are electrically connected.

Description

Battery cell, battery device and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell, a battery device and an electric device. BACKGROUND

[0002] In the related art, the battery device includes a plurality of battery cells, and two poles of two battery cells are electrically connected by a gasket. During use of the battery device, vibration and impact often occur, in which case the gasket will pull the solder joint between the gasket and the pole, resulting in reduced reliability of the battery cell.

[0003] SUMMARY

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electric device, which can increase the overcurrent capacity of the electrical connection of two poles to some extent.

[0005] In a first aspect, the present application provides a battery cell, which includes a shell, an electrode assembly and a pole assembly. The shell has two first side walls opposite to each other, the area of the first side wall is larger than that of other side walls, and the two first side walls are arranged opposite to each other along a first direction. The electrode assembly is arranged in the shell. The pole assembly includes first and second poles with opposite polarities, and the first and second poles are electrically connected to the electrode assembly and arranged on the two first side walls, respectively. The first pole is configured to be inserted into the second pole of another adjacent battery cell to electrically connect the two adjacent battery cells.

[0006] In the battery cell of the present application, the pole is arranged on the first side wall with the largest area, so that the area of the pole can be increased, thereby increasing the overcurrent area of the electrical connection of the battery cell and ensuring the fast charging performance. At the same time, the battery cell expands during use, and the first side wall with the largest area has a larger expansion force relative to other side walls, so that the insertion stability of the poles between the first side walls is better. In addition, the first and second poles are connected by mutual insertion, which can avoid the use of pole welding to achieve electrical connection. Compared with the situation that the battery cell cannot be disassembled and reused after the pole is welded, the insertion scheme is also conducive to the disassembly and reuse of the battery cell, thereby improving the maintainability of the battery.

[0007] In some embodiments, the first pole includes an insertion part, and the second pole is formed with an insertion slot adapted to the insertion part; the insertion part can be directly inserted into the insertion slot of another adjacent battery cell.

[0008] In the embodiments of the present application, the two adjacent battery monomers are inserted through the insertion part of the first pole column into the insertion slot on the other battery monomer, instead of the connection mode of welding the copper bar with the pole column assembly of the adjacent battery monomer to realize the electrical connection of the battery monomers, so as to improve the defects such as virtual welding and burst hole caused by welding the copper bar with the pole column assembly, thereby improving the reliability of the electrical connection between the battery monomers. At the same time, the insertion cooperation mode is used instead of welding, which can realize the disassembly of the battery monomers compared with welding, and improve the maintainability of the battery device.

[0009] In some embodiments, the first pole column includes an insertion part protruding from the first side wall where the first pole column is located, and the second pole column is formed with an insertion slot recessed in the first side wall where the second pole column is located.

[0010] In the embodiments of the present application, the insertion part protrudes from the first side wall where the first pole column is located, and the insertion slot is recessed in the first side wall where the second pole column is located, and the first pole column and the second pole column of the two battery monomers are electrically connected by inserting the insertion part into the insertion slot. The part of the first pole column protruding from the first side wall can extend into the first side wall of the other battery monomer, so that the distance between the battery monomers in the first direction is shortened, space is saved, and the energy density is improved.

[0011] In some embodiments, the first pole column includes an insertion part protruding from the first side wall where the first pole column is located, and the second pole column protrudes from the first side wall where the second pole column is located. The end of the second pole column protruding from the first side wall is formed with an insertion slot recessed towards the first side wall relative to the end of the second pole column, and the depth of the recessed insertion slot is less than or equal to the height of the second pole column protruding from the first side wall.

[0012] In the embodiments of the present application, the insertion part protrudes from the first side wall where the first pole column is located, and the insertion slot is recessed in the first side wall where the second pole column is located, and the first pole column and the second pole column of the two battery monomers are electrically connected by inserting the insertion part into the insertion slot. Thus, the two battery monomers are efficiently connected, and the grouping efficiency of the battery device is improved to some extent.

[0013] In some embodiments, the first pole column of one battery monomer is directly opposite the second pole column of another battery monomer adjacent in the first direction, and at least a part of the insertion part of the battery monomer is inserted into the insertion slot of the other battery monomer adjacent in the first direction.

[0014] In the embodiments of the present application, the first pole column of one battery monomer is directly opposite the second pole column of another battery monomer adjacent in the first direction, and the insertion part of the first pole column is partially or completely inserted into the insertion slot of the second pole column of the other battery monomer. Thus, the two adjacent battery monomers are inserted into each other in the first direction through the first pole column and the second pole column, and a stable and reliable electrical connection is realized.

[0015] In some embodiments, the first pole post comprises a pole post body and an electrical connector which is in a plug-in fit with the pole post body, and an end of the electrical connector which is away from the pole post body is configured to be in plug-in fit with a second pole post of another adjacent battery cell.

[0016] By connecting the pole post bodies of adjacent battery cells through the electrical connector, compared with the direct plug-in fit of the pole post bodies of adjacent battery cells, not only the shape of each pole post body can be uniformly regulated to ensure the manufacturing efficiency of the pole post body, but also the distance between adjacent battery cells can be adjusted through the intermediate electrical connector to adapt to the expansion of the battery cell, and the reliability of the electrical connection between the battery cells can be further improved.

[0017] In some embodiments, the pole post body and the second pole post are each formed with a plug-in slot; the two ends of the electrical connector are each formed with a plug-in part, one of the two plug-in parts is in plug-in fit with the plug-in slot of the pole post body, and the other of the two plug-in parts is in plug-in fit with the plug-in slot of the second pole post of the adjacent battery cell.

[0018] In the embodiments of the present application, the electrical connection between the pole post body, the electrical connector and the second pole post is achieved by inserting the plug-in part into the plug-in slot, which is relatively simple to operate and relatively stable in connection. Meanwhile, the two battery cells which are electrically connected can be exempted from welding fit, thereby avoiding the problem that the electrode assembly is easily damaged when the pole post assembly is disassembled from the welding position.

[0019] In some embodiments, the pole post body and the second pole post each protrude from the first side wall where each is located, and the protruding part of the pole post body and the second pole post is respectively recessed towards the first side wall to form the plug-in slot; or, the pole post body and the second pole post are each recessed inwardly relative to the first side wall where each is located to directly form the plug-in slot.

[0020] In the embodiments of the present application, the pole post body and the second pole post each protrude from the first side wall where each is located, thereby reducing the influence of the damage of the pole post assembly on the electrode assembly and other structures inside the battery cell. In addition, it is convenient to make and assemble when the first pole post and the second pole post are separately formed with the battery cell.

[0021] In the embodiments of the present application, the pole post body and the second pole post are recessed from the first side wall where each is located towards the inside of the battery cell to form the plug-in slot, so that the electrical connector is directly inserted into the inside of the surface of the battery cell, the pole post assembly is not easy to deform under the conditions of collision, extrusion, pulling and the like, and the plug-in structure of the plug-in slot and the electrical connector is relatively stable.

[0022] In some embodiments, the pole body and the second pole are each provided with a plug-in part, and the two ends of the electrical connector are each formed with a plug-in slot; one of the two plug-in slots is plugged with the plug-in part of the pole body, and the other of the two plug-in slots is configured to be plugged with the plug-in part of the second pole of the adjacent battery cell.

[0023] In the embodiments of the present application, the electrical connection between the pole body, the electrical connector and the second pole is achieved by plugging the plug-in part into the plug-in slot, which is relatively simple to operate and relatively stable in connection. Meanwhile, the two battery cells that have completed the electrical connection can be exempted from welding cooperation, thereby avoiding the problem that the electrode assembly is easily damaged when the pole assembly is disassembled at the welding position.

[0024] In some embodiments, the pole body and the second pole are each protruded from the first side wall where it is located to directly form the plug-in part; or the pole body and the second pole are each recessed from the first side wall where it is located, and a plug-in part with a size smaller than that of the recess is protruded at the recessed position.

[0025] In the embodiments of the present application, the pole body and the second pole are protruded from the first side wall where they are located, thereby reducing the influence of damage to the electrode assembly and other structures inside the battery cell. In addition, it is convenient to manufacture and assemble when the pole assembly and the battery cell are separately formed.

[0026] In the embodiments of the present application, the pole body and the second pole are recessed from the first side wall where they are located towards the inside of the battery cell, so that the electrical connector is directly inserted into the inside of the surface of the battery cell, and the plug-in part and the plug-in slot are plugged at the inside of the surface of the battery cell, thereby reducing external interference and improving the connection reliability of the electrical connector and the battery cell.

[0027] In some embodiments, the electrode assembly includes a main body part and a tab part connected to the end of the main body part, the first side wall includes a first region covering the main body part and a second region covering the tab part, the second region is close to the edge of the first side wall, and the first pole and the second pole are arranged in the second region and electrically connected with the tab part.

[0028] In the embodiments of the present application, the first region covers the main body part, and the second region covers the tab part. During the use of the battery cell, the first side wall is deformed by expansion in the first region, and the first pole and the second pole are arranged in the second region, so that the poles are less affected by the expansion of the electrode assembly. In addition, the poles are arranged close to the edge of the first side wall, which improves the high-voltage protection in the case of assembly, maintenance and the like.

[0029] In some embodiments, the main body part includes a winding or laminated pole piece, and the pole piece is coated with an active material layer to generate electric energy. The region of the pole piece coated with the active material layer is opposite to the first region along the first direction.

[0030] In the embodiments of the present application, the active material layer is coated on the pole piece and spaced apart from the tab at the edge of the pole piece forming the tab part by a small distance. The projection of the active material layer on the first side wall in the first direction is entirely within the range of the first region. The first side wall can be parallel to the active material layer in the first region, and the first region and the plane where the active material layer is located can both be perpendicular to the first direction.

[0031] In some embodiments, the first side wall is square-shaped, the first side wall has two short sides opposite in the second direction and two long sides opposite in the third direction, the length of the short side is less than that of the long side, the second direction, the third direction and the first direction are perpendicular to each other, the second region is arranged close to one of the short side and the long side, and the first pole and the second pole extend along the length direction of the short side or the long side close to the second region and are in a strip shape.

[0032] In the embodiments of the present application, the pole extends along the length direction of the close short side or long side in a strip shape, which is beneficial to disperse stress in the length direction of the edge of the first side wall and improve the structural stability of the pole insertion.

[0033] In some embodiments, the battery monomer includes an elastic electrical connecting piece, the elastic electrical connecting piece is arranged on the first pole and / or the second pole, and the elastic electrical connecting piece is used to elastically abut between the first pole and the second pole of the adjacent battery monomer to realize the electrical connection of the two adjacent battery monomers when the first pole is inserted into the second pole.

[0034] In the embodiments of the present application, the elastic electrical connecting piece elastically abuts between the insertion part of one battery monomer and the insertion slot of another adjacent battery monomer, and the elastic electrical connecting piece can keep sufficient contact between the insertion part and the insertion slot under static and dynamic conditions such as vibration impact, so as to improve the electrical contact area of the two poles to a certain extent, reduce the overcurrent impedance and heat problem, improve the electrical connection reliability of the two adjacent battery monomers, and reduce or avoid safety problems.

[0035] In some embodiments, the elastic electrical connecting piece is distributed along the circumferential direction of the pole assembly.

[0036] In the embodiments of the present application, the elastic electrical connecting piece is distributed along the circumferential direction of the pole assembly, which can improve the connection area of the first pole and the second pole to a certain extent.

[0037] In some embodiments, the elastic electrical connecting piece includes a first end and a second end, the first end is fixedly connected with the first pole or the second pole, and the second end is movable relative to the first pole or the second pole.

[0038] In the embodiments of the present application, when the first pole and the second pole are assembled, the plug-in part is inserted into the plug-in slot, the first end of the elastic electrical connecting piece is fixedly connected to the pole, and the second end is movable, so that the second end of the elastic electrical connecting piece is movable when the elastic electrical connecting piece is extruded, the elastic electrical connecting piece is easy to deform, and damage to the elastic electrical connecting piece and assembly resistance are avoided to some extent.

[0039] In some embodiments, the pole assembly is provided with a groove, and the battery monomer is configured such that, during assembly of the first pole and the second pole, when the elastic electrical connecting piece deforms, the second end is inserted into the groove to release the stress of the elastic electrical connecting piece.

[0040] In the embodiments of the present application, during assembly of the first pole and the second pole, when the elastic electrical connecting piece deforms due to extrusion of the two poles, the second end moves to be inserted into the groove to release the stress of the elastic electrical connecting piece, and the elastic electrical connecting piece is prevented from being excessively extruded and damaged to some extent.

[0041] In some embodiments, the battery monomer includes a pressure relief mechanism, and the pressure relief mechanism is arranged on a surface of the shell different from the first side wall. The pressure relief mechanism is used to crack the shell before the shell cracks when the internal pressure of the battery monomer exceeds a pressure threshold.

[0042] In the embodiments of the present application, the pressure relief mechanism is arranged on a surface of the shell different from the first side wall, and the pressure relief mechanism cracks before other walls of the shell when the internal pressure of the battery monomer exceeds a threshold, thereby releasing the internal pressure, avoiding the risk of cracking of the first side wall when the internal pressure of the battery monomer is too large, reducing the influence of the internal pressure of the battery monomer on the pole, and further reducing the safety risk.

[0043] In some embodiments, the shell is provided with a mounting hole, and the pole assembly is entirely covered outside the mounting hole, or part of the pole assembly is covered outside the mounting hole, and part of the pole assembly penetrates into the shell through the mounting hole to cooperate with the shell.

[0044] In the embodiments of the present application, the pole assembly is entirely covered outside the mounting hole, which facilitates assembly of the pole assembly and the shell, simplifies the manufacturing process, improves the reliability and stability of the connection between the first pole and the shell, and prevents the first pole from being separated from the shell or cracked or damaged due to vibration or external pulling after the first pole cooperates with the shell during charging and discharging of the battery monomer.

[0045] The pole assembly is partially covered outside the mounting hole and partially penetrates into the shell through the mounting hole to cooperate with the shell, which is conducive to improving the stability of the electrical connection between the pole assembly and the electrode assembly in the shell and the overcurrent capacity.

[0046] In some embodiments, the shell comprises a shell body and a cover body, the shell body has an opening, and the cover body seals the opening; the pole column is arranged in any one of the shell body and the cover body.

[0047] In a second aspect, the embodiments of the present application provide a battery device, the battery device comprising the battery monomer of any one of the above embodiments, the two first side walls of the battery monomer are opposite along a first direction, and the number of the battery monomers is multiple and arranged along the first direction.

[0048] In the battery device of the technical scheme of the present application, the pole column is arranged on the first side wall with the largest area in the battery monomer, so that the area of the pole column can be increased, thereby increasing the overcurrent area of the electrical connection of the battery monomer and guaranteeing the fast charging performance. At the same time, the battery monomer expands during use, and the first side wall with the largest area has a larger expansion force relative to other side walls, so that the insertion stability of the pole column between the first side walls is better. In addition, the insertion connection of the first pole column and the second pole column is also conducive to the repeated step-by-step use of the battery monomer, thereby improving the maintainability of the battery.

[0049] In the embodiments of the present application, the shell body has an opening, and the cover body seals the opening; the pole column assembly is arranged in any one of the shell body and the cover body, thereby facilitating the assembly and production of the shell and the electrode assembly.

[0050] In some embodiments, the battery device comprises an adapter, a plurality of battery monomers are arranged along a first direction to form a plurality of battery groups, the plurality of battery groups are arranged along a second direction, and in the two adjacent battery groups along the second direction, one of the battery monomers at the head or tail along the first direction is connected with the adapter to realize the electrical connection of the two adjacent battery groups.

[0051] In the embodiments of the present application, the adapter is connected with the two adjacent battery groups at the head or tail along the first direction, thereby realizing the electrical connection of the two adjacent battery groups and improving the grouping efficiency of the battery device.

[0052] In some embodiments, the adapter is formed with a second insertion slot or a second insertion part and is inserted with the battery monomer.

[0053] In the embodiments of the present application, the adapter is inserted with the battery monomer through the second insertion slot or the second insertion part, thereby realizing the electrical connection of the adapter and the battery monomer and guaranteeing good electrical connection stability.

[0054] In some embodiments, the battery device comprises a sampling member, the sampling member directly contacts with the pole column to collect parameter information of at least one of the two adjacent battery monomers.

[0055] In the embodiments of the present application, the sampling member directly contacts with the pole column, thereby improving the accuracy and synchronism of collecting the parameter information of the battery monomer.

[0056] In some embodiments, the contact manner of the sampling member with the pole assembly comprises at least one of the following:

[0057] The sampling member is in contact with at least one of the connected first pole and second pole in the axial direction of the pole assembly;

[0058] The sampling member is in contact with at least one of the connected first pole and second pole in the circumferential direction of the pole assembly;

[0059] The sampling member is in contact with at least one of the connected first pole and second pole in the radial direction of the pole assembly.

[0060] In the embodiments of the present application, the sampling member can be in contact with the first pole and / or the second pole in at least one of the axial, circumferential and radial directions of the pole, realizing the electrical connection of the sampling member with the first pole and / or the second pole, so that a flexible sampling connection scheme can be provided for different pole assembly connection manners, the arrangement of the sampling member is more flexible, and the space limitation of the battery device on the sampling member is relieved to a certain extent.

[0061] In some embodiments, the battery device further comprises a box body, a first expansion beam and a second expansion beam; the first expansion beam and the second expansion beam are arranged at intervals and jointly form a battery compartment with the box body, and a plurality of battery monomers are sequentially arranged in the battery compartment, and the battery monomers at the ends are respectively matched with the first expansion beam and the second expansion beam.

[0062] In the embodiments of the present application, the battery compartment is jointly formed by the first expansion beam, the second expansion beam and the box body, a plurality of battery monomers are sequentially arranged in the battery compartment, and the battery monomers at the ends are respectively matched with the first expansion beam and the second expansion beam, so that the first expansion beam and the second expansion beam can provide better constraint force for the expansion of the battery monomers while saving installation space and improving energy density.

[0063] In other embodiments, the battery device further comprises a box body, a module shell and a mounting beam, a plurality of battery monomers are arranged in the module shell, and the module shell is mounted in the box body through the mounting beam. In the embodiments of the present application, the module shell provides a stable and reliable installation space for the battery monomers.

[0064] In a third aspect, the embodiments of the present application provide a power utilization device, which comprises the battery monomer of any one of the above-mentioned embodiments and is used to provide electric energy, or comprises the battery device of any one of the above-mentioned embodiments and is used to provide electric energy.

[0065] The power consumption device in the technical scheme of the present application has the two pole columns arranged on the first side wall with the largest area of the battery monomer, and the electrical connection area between the two pole columns can also be increased to maintain a large overcurrent capacity, thereby improving the fast charging performance of the battery monomer and the battery device and the power consumption device using the battery monomer to a certain extent, and improving the electrical connection reliability of the two pole columns.

[0066] In some embodiments, the power consumption device is a vehicle, the battery device includes a box body, and the plurality of battery monomers are arranged in the box body; at least a part of a chassis of the vehicle constitutes an upper cover of the box body.

[0067] In the embodiments of the present application, the chassis of the vehicle constitutes the upper cover of the box body, thereby saving the connecting structure and improving the structural compactness of the interior of the vehicle.

[0068] The above description is only a summary of the technical scheme of the present application, in order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the specification, and in order to enable the above and other purposes, features and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0069] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the several views that follow. In the drawings:

[0070] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0071] FIG. 2 is an exploded structural schematic diagram of a battery device according to some embodiments of the present application;

[0072] FIG. 3 is an exploded structural schematic diagram of a battery monomer according to some embodiments of the present application;

[0073] FIG. 4 is a schematic diagram of two battery monomers before assembly according to some embodiments of the present application;

[0074] FIG. 5 is a schematic diagram of two battery monomers before assembly according to some other embodiments of the present application;

[0075] FIG. 6 is a schematic diagram of the battery monomers in the embodiment shown in FIG. 4 from a front view perspective;

[0076] FIG. 7 is a schematic diagram of the battery monomers in the embodiment shown in FIG. 5 from a front view perspective;

[0077] FIG. 8 is a structural schematic diagram of a battery monomer according to some embodiments of the present application;

[0078] Figure 9 is a schematic view of two battery cells prior to assembly in accordance with some embodiments of the application;

[0079] Figure 10 to Figure 11 are schematic views of a first pole in accordance with some embodiments of the application;

[0080] Figure 12 is a schematic view of a second pole in accordance with some embodiments of the application;

[0081] Figure 13 is a schematic cross-sectional view of a second pole in accordance with some embodiments of the application;

[0082] Figure 14 is a schematic cross-sectional view of two battery cells in accordance with some embodiments of the application;

[0083] Figure 15 is a magnified view of portion Al of Figure 14;

[0084] Figure 16 is a magnified view of portion A2 of Figure 15.

[0085] Figure 17 is a schematic cross-sectional view of two battery cells prior to assembly in accordance with some embodiments of the application;

[0086] Figure 18 is a magnified view of portion C2 of Figure 17;

[0087] Figure 19 is a schematic cross-sectional view of two battery cells during assembly in accordance with some embodiments of the application;

[0088] Figure 20 is a magnified view of portion Bl of Figure 19;

[0089] Figure 21 is a magnified view of portion B2 of Figure 20;

[0090] Figure 22 is a schematic view of a first pole and a second pole prior to assembly in accordance with some other embodiments of the application;

[0091] Figure 23 is a schematic cross-sectional view of a battery device in accordance with some embodiments of the application;

[0092] Figure 24 is a schematic cross-sectional view of a battery device in accordance with some other embodiments of the application;

[0093] Figure 25 is a schematic view of two battery cells in accordance with some other embodiments of the application;

[0094] Figure 26 is a schematic view of two battery cells in accordance with some other embodiments of the application;

[0095] Figure 27 is a schematic view of a battery cell in accordance with some other embodiments of the application;

[0096] Figure 28 is a schematic view of the battery cell of Figure 27 from a top perspective.

[0097] The reference signs in the detailed description of the embodiments are as follows: vehicle 1000; battery device 100, controller 200, motor 300; box body 10, first part 11, second part 12, battery compartment 15, cross beam 16, longitudinal beam 17, battery pack 18; battery monomer 20, pole column assembly 21, groove 211, elastic electrical connecting piece 22, first end 221, second end 222, first pole column 23, plug-in part 231, first base 232, pole column body 230, electrical connecting piece 30, second pole column 24, plug-in groove 241, second base 242, matching part 243, shell 25, first side wall 251, first area 2511, second area 2512, short side 2513, long side 2514, electrode assembly 26, main body part 261, pole lug part 262, shell body 252, opening 2521, cover 253, pressure relief mechanism 254, accommodating groove 257, sampling piece 41, output line 42. DETAILED DESCRIPTION

[0098] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0099] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having", and any variations thereof, as used in the specification and claims and the above description of the drawings, are intended to cover not exclusively inclusive.

[0100] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0101] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0102] 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.

[0103] 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).

[0104] 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," and "circumferential" 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 are not intended to 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.

[0105] In the description of the embodiments of this application, unless otherwise expressly specified and limited, 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.

[0106] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0107] In related technologies, battery devices include multiple battery cells, and two battery cells are electrically connected through two terminals. During use, battery devices are often subjected to vibration and shock. Under such circumstances, insufficient contact at the electrical contact surfaces may occur, resulting in low overcurrent capacity of the electrical connection between the two terminals, excessive local resistance, and hindering the improvement of fast charging performance.

[0108] In order to increase the overcurrent capacity of the electrical connection of the two pole posts, the application provides a battery monomer, which comprises a shell, an electrode assembly and a pole post, the shell has two first side walls opposite to each other, the area of the first side wall is larger than that of the other side wall, and the two first side walls are opposite to each other along the first direction; the electrode assembly is arranged in the shell; the pole post comprises a first pole post and a second pole post with opposite polarities, the first pole post and the second pole post are both electrically connected with the electrode assembly and are arranged on the two first side walls respectively, and the first pole post is used for plugging with the second pole post of another adjacent battery monomer to electrically connect the two battery monomers.

[0109] In such a battery monomer, the pole post is arranged on the first side wall with the largest area of the battery monomer, the area of the pole post is increased, thereby increasing the overcurrent area of the electrical connection of the battery monomer, and facilitating the improvement of fast charging performance and stability.

[0110] The battery device can be used as a power supply for a power consumption device or various energy storage systems using the battery device as an energy storage element. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0111] The following embodiments are described with a power consumption device as a vehicle 1000 for convenience of description.

[0112] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the application. The vehicle 1000 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0113] In some embodiments of the application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0114] Please refer to FIG. 2 and FIG. 3, FIG. 2 is a structural schematic diagram of a battery device 100 provided by some embodiments of the present application, and FIG. 3 is an exploded structural schematic diagram of the battery device 100 provided by some embodiments of the present application. The battery device 100 comprises a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. The box 10 is used to provide a battery compartment for the battery cell 20, and the box 10 can adopt various structures. In some embodiments, the box 10 can comprise a first part 11 and a second part 12, the first part 11 and the second part 12 are mutually covered, and the first part 11 and the second part 12 jointly define a battery compartment for containing the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate structure, which is covered on the open side of the second part 12 to jointly define the battery compartment with the second part 12; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0115] In the battery device 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 20 is contained in the box 10; of course, the battery device 100 can also be that the multiple battery cells 20 are first connected in series, in parallel or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, which is contained in the box 10. The battery device 100 can also comprise other structures, for example, the battery device 100 can also comprise a current collecting component for realizing the electrical connection between the multiple battery cells 20.

[0116] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0117] Please refer to FIG. 3 to FIG. 9, the embodiment of the application provides a battery monomer 20, the battery monomer 20 includes a shell 25, an electrode assembly 26 and a pole assembly 21. Wherein, the shell 25 has two first side walls 251 opposite, the area of the first side wall 251 is greater than the area of other side walls, two first side walls 251 are opposite along the first direction;The electrode assembly 26 is arranged in the shell 25;The pole assembly 21 includes the first pole 23 and the second pole 24 of opposite polarity, the first pole 23 and the second pole 24 are electrically connected with the electrode assembly 26 and are arranged on two first side walls 251 respectively, the first pole 23 is used to be inserted with the second pole 24 of another adjacent battery monomer 20, so that two battery monomers 20 are electrically connected.The front and back direction as shown is the first direction.

[0118] Please refer to FIG. 3, FIG. 3 is the exploded structural schematic diagram of the battery monomer 20 provided by some embodiments of the application, the battery monomer 20 refers to the smallest unit of the battery device 100.

[0119] The shell 25 is used to form the internal environment of the battery monomer 20, wherein the formed internal environment can be used to accommodate the electrode assembly 26, electrolyte and other components. The shell 25 can be various shapes and various sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the shell 25 can be determined according to the specific shape and size of the electrode assembly 26. The material of the shell 25 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not specially limited in the embodiment of the application.

[0120] Optionally, please combine FIG. 3-5, in some examples, the shell 25 is cuboid or flat body shape, the shell 25 has front, back, left, right, top and bottom six surfaces, the first direction is front and back direction, the first side wall 251 forms the front surface and the back surface of the shell 25. The area of the front and back two first side walls 251 is approximately the same, and both are greater than the surface area of the shell 25 on any side of left, right, top and bottom.

[0121] Optionally, please combine FIG. 3-5, in some examples, the first side wall 251 in front is provided with a pole assembly 21, the pole assembly 21 on the first side wall 251 in front can be positive pole or negative pole. The first side wall 251 in back is provided with a pole assembly 21, which can be positive pole or negative pole and opposite in polarity with the pole assembly 21 on the first side wall 251 in front. Thus, two battery monomers 20 connected through the pole assembly 21 along the front and back direction can be connected in series.

[0122] Optionally, in an embodiment, the first pole 23 is a positive pole, and the second pole 24 is a negative pole. In other examples, the first pole 23 is a negative pole, and the second pole 24 is a positive pole. A first pole 23 can be arranged on the front first side wall 251, and a second pole 24 can be arranged on the rear first side wall 251.

[0123] Optionally, in an embodiment, the number of pole assemblies 21 on the same first side wall 251 can also be two or more.

[0124] Optionally, in an embodiment, as shown in FIG. 8, the first direction is the front-rear direction, two pole assemblies 21 are arranged on the front first side wall 251, and two pole assemblies 21 are arranged on the rear first side wall 251. The two pole assemblies 21 in front are negative poles or positive poles (negative poles in FIG. 8), and the two pole assemblies 21 in rear are positive poles or negative poles (positive poles in FIG. 8). Thus, two battery monomers 20 connected by the pole assemblies 21 in the front-rear direction are connected in series.

[0125] Optionally, in an embodiment, as shown in FIG. 9, two pole assemblies 21 are arranged on the front first side wall 251, and two pole assemblies 21 are arranged on the front first side wall 251. In the two pole assemblies 21 in front, one is a negative pole, and the other is a positive pole. In the two pole assemblies 21 in front, one is a positive pole, and the other is a negative pole. Thus, two battery monomers 20 connected by the pole assemblies 21 in the front-rear direction are connected in parallel. When connected in parallel, the negative pole on the rear first side wall 251 of the battery monomer 20 in front can be connected to the negative pole on the front first side wall 251 of the battery monomer 20 in rear, and the positive pole on the rear first side wall 251 of the battery monomer 20 in front can be connected to the positive pole on the front first side wall 251 of the battery monomer 20 in rear.

[0126] In the battery monomer 20 of the technical scheme, the pole assembly 21 is arranged on the first side wall 251 with the largest area, so that the area of the pole assembly 21 can be increased, thereby increasing the overcurrent area of the electrical connection of the battery monomer 20 and ensuring the fast charging performance. At the same time, since the battery monomer 20 expands during use, and the first side wall 251 with the largest area has a larger expansion force relative to other side walls, the insertion stability of the pole assembly 21 between the first side walls 251 is better. In addition, by inserting and connecting the first pole 23 and the second pole 24, the electrical connection can be achieved without welding the poles. Compared with the situation that the battery monomer 20 cannot be disassembled and reused after the poles are welded, the insertion scheme is also conducive to the disassembly and reuse of the battery monomer 20, thereby improving the maintainability of the battery monomer 20 and the battery device 100.

[0127] In some embodiments, the first pole 23 comprises a plug-in part 231, and the second pole 24 is formed with a plug-in groove 241 which is adapted to the plug-in part 231; the plug-in part 231 can be directly plugged into the plug-in groove 241 of another adjacent battery cell 20.

[0128] Specifically, the plug-in groove 241 is a groove, and the plug-in part 231 is a protruding structure which is matched with the shape and size of the plug-in groove 241; at least a part of the plug-in part 231 is accommodated in the plug-in groove 241 to complete the plugging of the first pole 23 and the second pole 24.

[0129] In the embodiments of the present application, the two adjacent battery cells 20 are plugged by the plug-in part 231 of one first pole 23 and the plug-in groove 241 on another battery cell 20, instead of the connection mode of welding the copper bar with the pole assembly 21 of the adjacent battery cell 20 to realize the electrical connection of the battery cells 20, so as to improve the defects such as virtual welding and burst hole caused by welding the copper bar with the pole assembly 21, thereby improving the reliability of the electrical connection between the battery cells 20. At the same time, the plug-in mode is used to replace the welding, which can realize the disassembly of the battery cells 20 compared with the welding, and can improve the maintainability of the battery cells 20 and the battery device 100.

[0130] Please refer to FIGS. 10-16, in some embodiments, the first pole 23 comprises a plug-in part 231, the plug-in part 231 protrudes from the first side wall 251 where the first pole 23 is located, and the second pole 24 is formed with a plug-in groove 241 which is concave relative to the first side wall 251 where the second pole 24 is located.

[0131] Specifically, as shown in FIGS. 11 and 13, the first pole 23 and the second pole 24 are connected in a mortise and tenon type plugging mode, and the plug-in part 231 is matched with the shape of the plug-in groove 241. In this way, the first pole 23 and the second pole 24 are matched more closely, which improves the connection reliability of the pole assembly 21 to a certain extent.

[0132] As shown in FIG. 15, the first pole 23 comprises a plug-in part 231, and the second pole 24 is provided with a plug-in groove 241, at least a part of the plug-in part 231 is located in the plug-in groove 241, so that the first pole 23 and the second pole 24 can be connected in a convex-concave complementary mode, the welding or bolt connection between the two pole assemblies 21 can be cancelled, the grouping efficiency of the battery system is improved, and the maintainability after sale and the step utilization of the battery cells 20 are improved.

[0133] It should be noted that in this embodiment, the plug-in part 231 protrudes from the first side wall 251 where the first pole 23 is located, and the first base 232 of the first pole 23 can protrude relative to the first side wall 251 or be recessed relative to the first side wall 251 into the housing 25.

[0134] Two battery monomers 20 arranged along the first direction can be connected efficiently by the insertion of the insertion part 231 of one battery monomer 20 into the insertion slot 241 of another battery monomer 20, thereby improving the grouping efficiency of the battery device 100 to some extent.

[0135] In the embodiments of the present application, the insertion part 231 protrudes from the first side wall 251 where the first pole 23 is located, and the insertion slot 241 is recessed in the first side wall 251 where the second pole 24 is located. The first pole 23 and the second pole 24 of two battery monomers 20 are electrically connected by the insertion of the insertion part 231 into the insertion slot 241. The part of the first pole 23 protruding from the first side wall 251 can extend into the first side wall 251 of another battery monomer 20, thereby shortening the distance between the battery monomers 20 in the first direction, saving space, and facilitating the improvement of the energy density.

[0136] Please refer to FIGS. 5 to 13. In some embodiments, the first pole 23 includes the insertion part 231, the insertion part 231 protrudes from the first side wall 251 where the first pole 23 is located, and the second pole 24 protrudes from the first side wall 251 where the second pole 24 is located. The end of the second pole 24 protruding from the first side wall 251 forms the insertion slot 241. The insertion slot 241 is recessed towards the first side wall 251 relative to the end of the second pole 24, and the depth of the recess of the insertion slot 241 is less than or equal to the height of the second pole 24 protruding from the first side wall 251.

[0137] Optionally, in combination with FIGS. 11 and 13, the insertion part 231 can be in contact with the surface of the second pole 24 towards the insertion slot 241, thereby improving the connection area of the two pole assemblies 21. Optionally, the first pole 23 includes the first base 232, and the insertion part 231 is arranged on the first base 232. The second pole 24 includes the second base 242 and the matching part 243, and the matching part 243 is arranged on the second base 242. The matching part 243 is provided with the insertion slot 241. In this embodiment, the matching part 243 protrudes from the first side wall 251 where the second pole 24 is located. The first base 232 can protrude relative to the first side wall 251 or be recessed relative to the first side wall 251 towards the housing 25. The first base 232 can also be partially or entirely embedded in the first side wall 251.

[0138] In the embodiments of the present application, the insertion part 231 protrudes from the first side wall 251 where the first pole 23 is located, and the insertion slot 241 is recessed in the first side wall 251 where the second pole 24 is located. The first pole 23 and the second pole 24 of two battery monomers 20 are electrically connected by the insertion of the insertion part 231 into the insertion slot 241. The first pole 23 and the second pole 24 of two battery monomers 20 are electrically connected by the insertion of the insertion part 231 into the insertion slot 241, thereby improving the grouping efficiency of the battery device 100 to some extent.

[0139] Please refer to FIGS. 14-16. In some embodiments, the first pole 23 of one battery cell 20 is directly opposite the second pole 24 of another battery cell 20 adjacent in the first direction, and the battery cell 20 is configured to insert at least part of the insertion portion 231 into the insertion slot 241 of the another battery cell 20 adjacent in the first direction.

[0140] Specifically, the first pole 23 and the second pole 24 can be linearly extended in the first direction, protruding from or recessed relative to the first side wall 251. The first pole 23 is directly opposite the second pole 24 in the first direction, and the first pole 23 and the second pole 24 of the two battery cells 20 adjacent in the first direction are arranged in positions directly opposite in the first direction, and the pair of first and second electrodes of the two battery cells 20 are inserted in the first direction.

[0141] In the embodiments of the present application, the first pole 23 of one battery cell 20 is directly opposite the second pole 24 of another battery cell 20 adjacent in the first direction, and the insertion portion 231 of the first pole 23 is partially or completely inserted into the insertion slot 241 of the second pole 24 of the another battery cell 20, so that the two adjacent battery cells 20 are inserted in the first direction by the first pole 23 and the second pole 24, and a stable and reliable electrical connection is achieved.

[0142] Please refer to FIGS. 25-26. In some embodiments, the first pole 23 includes a pole body 230 and an electrical connector 30 in insertion cooperation with the pole body 230, and an end of the electrical connector 30 away from the pole body 230 is configured to be insertable with the second pole 24 of another adjacent battery cell 20.

[0143] Specifically, the two battery cells 20 adjacent in the first direction are inserted with two sides of the same electrical connector 30, and the electrical connection of the two adjacent battery cells 20 is achieved. The electrical connector 30 is matched in shape and size with the pole body 230. For example, the pole body 230 is in a long strip shape, and the electrical connector 30 is in a long columnar structure matched in size with the pole body 230.

[0144] Optionally, the electrical connector 30 can also be a thick and short column or other composite structure. Optionally, the electrical connector 30 can be in a cylindrical shape, a prismatic shape, or other shapes, which are not limited in the present application.

[0145] Optionally, the electrical connector 30 and the pole body 230 are in a split structure. Optionally, both ends of the electrical connector 30 are formed with a plug-in groove 241. Optionally, both ends of the electrical connector 30 are formed with a plug-in part 231. Optionally, one end of the electrical connector 30 is formed with a plug-in groove 241, and the other end is formed with a plug-in part 231. The second pole 24 is formed with a plug-in groove 241 matched with the plug-in part 231 of the electrical connector 30, or a plug-in column matched with the plug-in groove 241 of the electrical connector 30.

[0146] Optionally, the pole bodies 230 of two adjacent battery monomers 20 along the first direction are arranged oppositely along the first direction. The plurality of battery monomers 20 are sequentially connected by the plurality of electrical connectors 30 along the first direction.

[0147] In the embodiments of the present application, the electrical connection of the two battery monomers 20 is achieved by plugging the two battery monomers 20 with the electrical connector 30, instead of the connection mode of welding the copper bar with the pole of the adjacent battery monomer 20 to achieve the electrical connection of the battery monomer 20, so as to improve the defects such as virtual welding and burst hole caused by welding the copper bar with the pole, thereby improving the reliability of the electrical connection between the battery monomers 20. On the other hand, the pole bodies 230 of the adjacent battery monomers 20 are connected by the electrical connector 30, compared with the direct plugging of the pole bodies 230 of the adjacent battery monomers 20, not only the shape of each pole body 230 can be unified and standardized to ensure the manufacturing efficiency of the pole body 230, but also the distance between the adjacent battery monomers 20 can be adjusted through the intermediate electrical connector 30 to adapt to the expansion of the battery monomer 20, thereby further improving the reliability of the electrical connection between the battery monomers 20.

[0148] Please refer to FIG. 25, in some embodiments, the pole body 230 and the second pole 24 are both formed with a plug-in groove 241; both ends of the electrical connector 30 are respectively formed with two plug-in parts 231, one of the two plug-in parts 231 is plugged with the plug-in groove 241 of the pole body 230, and the other is plugged with the plug-in groove 241 of the second pole 24 of the adjacent battery monomer 20.

[0149] Optionally, the pole body 230 can be formed with a plug-in groove 241 with a cross-section in a circular, elliptical, triangular, square, polygonal, racetrack-shaped or other irregular shape. Optionally, the cross-sectional shape of the plug-in part 231 is circular, elliptical, triangular, square, polygonal, racetrack-shaped or other irregular shape matched with the plug-in groove 241.

[0150] Optionally, the pole body 230 extends along the length direction of the side of the battery cell 20 close to the pole body 230, forming a strip shape. The electrical connector 30 is a column close in length to the pole body 230. Further, the insertion slot 241 and the insertion part 231 both extend along the length direction of the pole body 230 to form a strip shape. Such a setting increases the connection area, which is particularly beneficial to dispersing stress in the length direction of the side of the battery cell 20 and ensuring the structural stability of the connection between the pole body 230 and the electrical connector 30.

[0151] Optionally, the insertion slot 241 includes a slot bottom surface 2112 and a slot inner circumferential surface 2113. The slot bottom surface 2112 is the deepest part of the insertion slot 241 in the recess direction, and the slot inner circumferential surface 2113 connects the slot bottom surface 2112 and the surface of the battery cell 20 or the end surface of the pole assembly 21. Further, the insertion slot 241 is recessed in the first direction, and the slot inner circumferential surface 2113 surrounds the insertion slot 241 in the up-down direction and the left-right direction.

[0152] Optionally, the insertion part 231 is a protruding structure matched with the insertion slot 241. The insertion part 231 is inserted into the insertion slot 241, the top end of the insertion part 231 in the first direction is accommodated in the insertion slot 241, the end surface of the insertion part 231 can abut against the slot bottom surface 2112, and the circumferential wall of the insertion part 231 can abut against the slot inner circumferential surface 2113.

[0153] In the embodiments of the present application, the electrical connection between the pole body 230, the electrical connector 30 and the second pole 24 is achieved by inserting the insertion part 231 into the insertion slot 241, which is relatively simple to operate and relatively stable in connection. At the same time, the two battery cells 20 that have completed the electrical connection can be exempted from welding cooperation, thereby avoiding the problem that the electrode assembly 26 is easily damaged when the welding position of the pole assembly 21 is disassembled.

[0154] In some embodiments, the pole body 230 and the second pole 24 both protrude from the first side wall 251 where they are located, and the protruding parts of the pole body 230 and the second pole 24 are recessed in the direction close to the first side wall 251 to form the insertion slot 241, respectively; or, referring to FIG. 25, the pole body 230 and the second pole 24 are both recessed inward relative to the first side wall 251 where they are located, to directly form the insertion slot 241.

[0155] Optionally, the pole body 230 has a first base 232, the second pole 24 has a second base 242, and the insertion slot 241 is recessed relative to the first base 232 to form the inside of the battery cell 20 where the pole body 230 is located, and is also recessed relative to the second base 242 to form the inside of the battery cell 20 where the second pole 24 is located.

[0156] For the convenience of description, the inner side and the outer side of the battery cell 20 are distinguished by the first side wall 251 where the pole body 230 and the second pole 24 are located respectively. In the same battery cell 20, the interval between the two first side walls 251 opposite to each other is located at the inner side of the battery cell 20, and the interval between the two first side walls 251 away from each other is located at the outer side of the battery cell 20.

[0157] Alternatively, in one example, the pole body 230 and the second pole 24 both protrude from the first side wall 251 where they are located respectively, and the pole body 230 and the second pole 24 are both at least partially located at the outer side of the battery cell 20. The first base 232 and the second base 242 are both located at the outer side of the battery cell 20 and are away from the first side wall 251 where they are located respectively by a certain distance, the groove bottom surface 2112 of the insertion slot 241 can be located at the inner side of the battery cell 20, and the groove inner peripheral surface 2113 of the insertion slot 241 is partially located at the inner side of the battery cell 20 and partially located at the outer side of the battery cell 20. The groove bottom surface 2112 can also be located at the outer side of the battery cell 20, and the groove inner peripheral surface 2113 is entirely located at the outer side of the battery cell 20.

[0158] In the embodiments of the present application, the pole body 230 and the second pole 24 both protrude from the first side wall 251 where they are located respectively, thereby reducing the influence of the damage of the pole assembly 21 on the electrode assembly 26 and other structures inside the battery cell 20. In addition, it is convenient to manufacture and assemble when the first pole 23 and the second pole 24 are formed separately from the battery cell 20.

[0159] Alternatively, in another example, the first base 232 and the second base 242 are connected to the two first side walls 251 adjacent to each other of the adjacent two battery cells respectively, and the groove bottom surface 2112 and the groove inner peripheral surface 2113 of the insertion slot 241 are both located at the inner side of the battery cell 20.

[0160] In the embodiments of the present application, the pole body 230 and the second pole 24 are recessed from the first side wall 251 where they are located respectively to the inner side of the battery cell 20 to form the insertion slot 241, so that the electrical connector 30 is directly inserted into the inner side of the surface of the battery cell 20, the pole assembly 21 is not easy to deform under the conditions of collision, extrusion, pulling and the like, and the insertion structure of the insertion slot 241 and the electrical connector 30 is relatively stable.

[0161] Please refer to FIG. 26, in some embodiments, the pole body 230 and the second pole 24 are both provided with the insertion part 231, and the two ends of the electrical connector 30 are both formed with the insertion slot 241; one of the two insertion slots 241 is inserted with the insertion part 231 of the pole body 230, and the other of the two insertion slots 241 is configured to be inserted with the insertion part 231 of the second pole 24 of the adjacent battery cell 20.

[0162] Optionally, the pole body 230 has a first base 232, the second pole 24 has a second base 242, and the insertion part 231 on the pole body 230 is protruded relative to the first base 232, and the insertion part 231 on the second pole is protruded relative to the second base 242. The insertion groove 241 is a groove matched with the insertion part 231, and the insertion groove 241 is recessed inward on the surface of the electrical connector 30. The top end of the protruded insertion part 231 is accommodated in the insertion groove 241, and the end face thereof can abut against the bottom wall of the recessed insertion groove 241. Optionally, the first direction is the front-rear direction, the pole part is arranged on the front-rear side of the battery monomer 20, and the insertion part 231 is protruded along the first direction, and the insertion groove 241 is recessed along the first direction.

[0163] Optionally, the electrical connector 30 is a long strip prism structure, the insertion groove 241 extends along the length direction of the electrical connector 30 to form a long strip square groove, and the insertion part 231 forms a long strip protrusion matched in size with the insertion groove 241. Optionally, the insertion groove 241 is a dovetail groove (not shown in the figure).

[0164] In the embodiments of the present application, the electrical connection between the pole body 230, the electrical connector 30 and the second pole 24 is realized by inserting the insertion part 231 into the insertion groove 241, the operation is relatively simple, and the connection is relatively stable. Meanwhile, the two battery monomers 20 that complete the electrical connection can be exempted from welding cooperation, thereby avoiding the problem that the electrode assembly 26 is easily damaged when the pole assembly 21 is disassembled at the welding position.

[0165] Please refer to FIG. 26. In some embodiments, the pole body 230 and the second pole 24 are both protruded from the first side wall 251 where each of them is located to directly form the insertion part 231; or the pole body 230 and the second pole 24 are both recessed from the first side wall 251 where each of them is located, and the insertion part 231 protruded at the recessed position is smaller than the size of the recess.

[0166] In one example, the pole body 230 and the second pole 24 are protruded from the first side wall 251 where each of them is located to the outside of the battery monomer 20, the part of the pole part protruded from the surface of the battery monomer 20 forms the insertion part 231, and the insertion part 231 is located on the outside of the battery monomer 20.

[0167] In the embodiments of the present application, the pole body 230 and the second pole 24 are protruded from the first side wall 251 where each of them is located, thereby reducing the influence of the damage of the pole assembly 21 on the electrode assembly 26 and other structures inside the battery monomer 20. In addition, it is convenient to manufacture and assemble when the pole assembly 21 and the battery monomer 20 are separately formed.

[0168] In another example, the pole body 230 and the second pole 24 are recessed from the first side wall 251 where each is located to the inside of the battery cell 20, and the bottom wall of the pole body 230 and the second pole 24 after being recessed is convex to form a plug-in portion 231 in a direction away from the battery cell 20. The plug-in portion 231 has a convex depth less than or equal to the depth of the recess of the pole body 230 and the second pole 24, and is located on the inside of the battery cell 20 and in the recessed area formed by the pole body 230 and the second pole 24. The electrical connector 30 can be partially inserted into the recessed area of the pole body 230 and the second pole 24 and engaged with the plug-in portion 231 on the inside of the battery cell 20 to accommodate the plug-in portion 231 in the plug-in slot 241.

[0169] In the embodiments of the present application, the pole body 230 and the second pole 24 are recessed from the first side wall 251 where each is located to the inside of the battery cell 20, so that the electrical connector 30 is directly inserted into the inside of the surface of the battery cell 20, and the plug-in portion 231 and the plug-in slot 241 are plugged on the inside of the surface of the battery cell 20, thereby reducing external interference and improving the connection reliability of the electrical connector 30 and the battery cell 20.

[0170] Please refer to FIG. 3, FIG. 6 and FIG. 7, in some embodiments, the electrode assembly 26 includes a main body portion 261 and a tab portion 262 connected to the end of the main body portion 261, the first side wall 251 includes a first area 2511 covering the main body portion 261 and a second area 2512 covering the tab portion 262, the second area 2512 is close to the edge of the first side wall 251, and the first pole 23 and the second pole 24 are arranged in the second area 2512 and electrically connected to the tab portion 262.

[0171] Specifically, the electrode assembly 26 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 26 can be contained in the shell 25. The electrode assembly 26 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually arranged between the positive and negative electrode sheets. The positive and negative electrode sheets have parts with active materials constituting the main body portion 261 of the electrode assembly 26, and the parts without active materials of the positive and negative electrode sheets each constitute the tab portion 262. The positive and negative electrode tabs can be located together at one end of the main body portion 261 or at two ends of the main body portion 261 respectively. During charging and discharging, the positive and negative active materials react with the electrolyte, and the tab portion 262 is connected to the pole assembly 21 to form a current loop.

[0172] The shell 25 is formed with a receiving space in which the electrode assembly 26 is accommodated, and the first side wall 251 and other side walls of the shell 25 surround the electrode assembly 26. The first side wall 251 covers the electrode assembly 26 in the first direction, and the first region 2511 covers the body part 261 and the second region 2512 covers the tab part 262 in the first direction. Due to the repeated oxidation-reduction reaction of the active material and the electrolyte during the charging and discharging process, the body part 261 is prone to release gas, which causes the shell 25 to easily expand, and the first side wall 251 expands and deforms more obviously at the first region 2511 than the second side wall.

[0173] In the embodiments of the present application, the first region 2511 covers the body part 261, and the second region 2512 covers the tab part 262. During use of the battery monomer 20, the first side wall 251 expands and deforms more obviously at the first region 2511, and the first and second pole columns 23 and 24 are arranged at the second region 2512, so that the pole column assembly 21 is less affected by the expansion of the electrode assembly 26. In addition, the pole column assembly 21 is arranged close to the edge of the first side wall 251, which improves the high-voltage protection in the case of assembly, maintenance, etc.

[0174] Please refer to FIGS. 3 to 7. In some embodiments, the body part 261 includes a winding or laminated pole piece, the pole piece is coated with an active material layer (not shown in the figure) to generate electric energy, and the region of the pole piece coated with the active material layer is directly opposite the first region 2511 in the first direction.

[0175] Specifically, the active material layer is coated on the pole piece and spaced from the tab part 262 at the edge of the pole piece forming the tab part 262 by a small distance. The projection of the active material layer on the first side wall 251 in the first direction is completely within the range of the first region 2511. The first side wall 251 in the first region 2511 can be parallel to the active material layer, and the planes in which the first region 2511 and the active material layer are located can be perpendicular to the first direction.

[0176] In the embodiments of the present application, the region of the pole piece coated with the active material layer is directly opposite the first region 2511 in the first direction, which can minimize the influence of the expansion and deformation of the pole piece on the stability of the insertion of the pole column assembly 21.

[0177] Please refer to FIG. 4 to FIG. 7, in some embodiments, the first side wall 251 is square, the first side wall 251 has two opposite short sides 2513 along a second direction (up-down direction as shown in the figure) and two opposite long sides 2514 along a third direction (left-right direction as shown in the figure), the length of the short side 2513 is less than the length of the long side 2514, the second direction, the third direction and the first direction are perpendicular to each other, the second area 2512 is arranged close to one of the short side 2513 and the long side 2514, and the first pole 23 and the second pole 24 extend along the length direction of the short side 2513 or the long side 2514 close to the second area 2512 and are in strip shape.

[0178] Optionally, in combination with FIG. 4 and FIG. 6, in one example, the first direction is the direction perpendicular to the paper in FIG. 6, the shell 25 is in the shape of a flat cuboid, and the first side wall 251 is the two side walls with the largest area on the cuboid-shaped shell 25. The first side wall 251 is in the shape of a rectangle, the long side 2514 of the first side wall 251 has the longest side length of the shell 25, and the short side 2513 of the first side wall 251 has the second longest side length of the shell 25. The first pole 23 and the second pole 24 are arranged close to the long side 2514, and the length extension direction of the first pole 23 and the second pole 24 is also the height direction of the shell 25. On the same first side wall 251, the two pole assemblies 21 (if any) are arranged close to the two long sides 2514 respectively.

[0179] Optionally, in combination with FIG. 5 and FIG. 7, in one example, the first direction is the direction perpendicular to the paper in FIG. 7, the shell 25 is in the shape of a cuboid, and the first side wall 251 is the two side walls with the largest area on the cuboid-shaped shell 25. The long side 2514 of the first side wall 251 has the longest side length of the shell 25, and the short side 2513 of the first side wall 251 has the second longest side length of the shell 25. The first pole 23 and the second pole 24 are arranged close to the short side 2513, and the length extension direction of the first pole 23 and the second pole 24 is also the length direction of the shell 25. On the same first side wall 251, the two pole assemblies 21 (if any) are arranged close to the two short sides 2513 respectively.

[0180] The mortise-and-tenon connection of the pole assembly 21 in the first direction (front-rear direction as shown in the figure) improves the space utilization in the up-down direction.

[0181] In the embodiments of the present application, the pole assembly 21 extends along the length direction of the close short side 2513 or long side 2514 in strip shape, which is beneficial to disperse stress in the length direction of the edge of the first side wall 251 and improve the structural stability of the pole assembly 21.

[0182] Please refer to FIGS. 12-22. In some embodiments, the battery cell 20 includes an elastic electrical connecting piece 22 disposed on the first pole 23 and / or the second pole 24, and the elastic electrical connecting piece 22 is used to elastically abut between the first pole 23 and the second pole 24 of an adjacent battery cell 20 when the first pole 23 is inserted into the second pole 24, so as to achieve electrical connection between the two adjacent battery cells 20.

[0183] Specifically, the elastic electrical connecting piece 22 includes, but is not limited to, an elastic spring sheet. For ease of illustration, the present application takes the first pole 23 formed with an insertion portion 231 and the second pole 24 formed with an insertion slot 241 as an example for illustration.

[0184] Optionally, please refer to FIGS. 12-16. The battery cell 20 provided with the insertion slot 241 has the elastic electrical connecting piece 22. The elastic electrical connecting piece 22 can be located in the insertion slot 241 and connected to the surface of the second pole 24 facing the insertion slot 241.

[0185] Optionally, please refer to FIG. 22. In one embodiment, the battery cell 20 provided with the insertion portion 231 has the elastic electrical connecting piece 22, which can be disposed on the insertion portion 231.

[0186] In the embodiments of the present application, the elastic electrical connecting piece 22 elastically abuts between the insertion portion 231 of one battery cell 20 and the insertion slot 241 of another adjacent battery cell 20. The elastic electrical connecting piece 22 can keep the insertion portion 231 and the insertion slot 241 in sufficient contact under static and dynamic conditions such as vibration impact, so as to increase the electrical contact area of the two pole assemblies 21 to a certain extent, reduce the overcurrent impedance and heat generation, improve the electrical connection reliability between the two adjacent battery cells 20, and reduce or avoid safety problems.

[0187] According to some embodiments of the present application, the elastic electrical connecting piece 22 is distributed along the circumferential direction of the pole assembly 21.

[0188] Optionally, in one embodiment, please refer to FIGS. 12 and 13. The elastic electrical connecting piece 22 is disposed on the surface of the second pole 24 facing the insertion slot 241, the elastic electrical connecting piece 22 is located in the insertion slot 241, and the elastic electrical connecting piece 22 is distributed along the circumferential direction of the second pole 24. The elastic electrical connecting piece 22 can connect the insertion portion 231 on the circumferential surface of the second pole 24 facing the insertion slot 241, so as to increase the connection area of the first pole 23 and the second pole 24 to a certain extent.

[0189] Optionally, in an embodiment, please refer to FIG. 22, the elastic electrical connecting member 22 can be arranged on the insertion portion 231 and distributed along the circumferential direction of the first pole 23, so that the elastic electrical connecting member 22 can be connected to the surface of the second pole 24 towards the insertion slot 241 on the circumferential surface of the insertion portion 231, and the connecting area of the first pole 23 and the second pole 24 can be improved to a certain extent.

[0190] Optionally, in an embodiment, the elastic electrical connecting member 22 can be in an integral ring structure and distributed along the circumferential direction of the pole assembly 21. Optionally, in an embodiment, a plurality of elastic electrical connecting members 22 can be distributed along the circumferential direction of the pole assembly 21.

[0191] In the embodiments of the present application, the elastic electrical connecting member 22 is distributed along the circumferential direction of the pole assembly 21, and the connecting area of the first pole 23 and the second pole 24 can be improved to a certain extent.

[0192] According to some embodiments of the present application, optionally, the elastic electrical connecting member 22 includes a first end 221 and a second end 222, the first end 221 is fixedly connected to the pole assembly 21, and the second end 222 is movable.

[0193] Optionally, in an embodiment, please refer to FIGS. 12-16, the battery monomer 20 provided with the insertion slot 241 has the elastic electrical connecting member 22 arranged on the surface of the second pole 24 towards the insertion slot 241. The first end 221 of the elastic electrical connecting member 22 is fixedly connected to the surface of the second pole 24 towards the insertion slot 241, and the second end 222 is movable. Optionally, in an embodiment, please refer to FIG. 22, the battery monomer 20 provided with the insertion portion 231 has the elastic electrical connecting member 22, one end of which is fixedly connected to the insertion portion 231, and the second end 222 is movable.

[0194] In the embodiments of the present application, when the first pole 23 and the second pole 24 are assembled, the insertion portion 231 is inserted into the insertion slot 241, the first end 221 of the elastic electrical connecting member 22 is fixedly connected to the pole assembly 21, and the second end 222 is movable, so that the second end 222 of the elastic electrical connecting member 22 can move when the elastic electrical connecting member 22 is extruded, the elastic electrical connecting member 22 is easy to deform, and the elastic electrical connecting member 22 can be damaged to a certain extent, and the assembly resistance can be reduced.

[0195] According to some embodiments of the present application, optionally, the pole assembly 21 is provided with a groove 211, and the battery pack 30 is configured such that, during the assembly of the first pole 23 and the second pole 24, when the elastic electrical connecting member 22 deforms, the second end 222 is inserted into the groove 211 to release the stress of the elastic electrical connecting member 22.

[0196] Optionally, in one embodiment, please refer to FIG. 12 to FIG. 16, the battery cell 20 with the insertion slot 241 has the elastic electrical connector 22, which is arranged on the circumferential surface of the second pole 24 towards the insertion slot 241, and the second pole 24 is provided with the groove 211 on the circumferential surface thereof towards the insertion slot 241. Optionally, in one embodiment, please refer to FIG. 22, the battery cell 20 with the insertion part 231 has the elastic electrical connector 22, which and the groove 211 are arranged on the circumferential surface of the insertion part 231.

[0197] The shape of the groove 211 includes but is not limited to regular shapes such as rectangle, circle, etc. or irregular shapes.

[0198] In the embodiment of the present application, when the elastic electrical connector 22 is deformed by being extruded by the insertion part 231 and the second pole 24 during the assembly of the first pole 23 and the second pole 24, the second end 222 moves to insert into the groove 211 to release the stress of the elastic electrical connector 22, which to some extent avoids the situation that the elastic electrical connector 22 is excessively extruded and damaged.

[0199] Optionally, please refer to FIG. 17 and FIG. 18, the insertion part 231 is protruded on the shell 25, and the second end 222 and the first end 221 are arranged in sequence along the direction in which the insertion part 231 is protruded.

[0200] In the drawings, the direction in which the insertion part 231 is protruded is the direction from back to front. The second end 222 and the first end 221 are arranged in sequence from back to front.

[0201] The second end 222 and the first end 221 are arranged in sequence along the direction in which the insertion part 231 is protruded, so that the first end 221 is closer to the outside of the shell 25 than the second end 222, and when the first pole 23 is assembled with the second pole 24, the insertion part 231 is inserted into the insertion slot 241, the second pole 24 extrudes the first end 221 first, and as the assembly proceeds, the second pole 24 extrudes the middle position of the elastic electrical connector 22, so that the second end 222 moves towards the shell 25, so that the second end 222 is easily flattened and enters the groove 211 (if any), reducing the resistance during assembly, to some extent avoiding damage to the elastic electrical connector 22, and facilitating the improvement of assembly efficiency.

[0202] Please refer to FIG. 3 to FIG. 5, in some embodiments, the battery cell 20 includes a pressure relief mechanism 254, which is arranged on the surface of the shell 25 other than the first side wall 251, and the pressure relief mechanism 254 is used to break the shell 25 first when the pressure inside the battery cell 20 exceeds a pressure threshold.

[0203] Optionally, the pressure relief mechanism 254 forms a local wall thickness that is relatively shallow compared to the overall wall thickness on the shell 25 outside the first side wall 251 by means of a notch, a groove, or the like. As shown in FIG. 3, the pressure relief mechanism 254 is arranged on the cover 253 of the battery monomer 20.

[0204] Optionally, the first side wall 251 is located on the front and back sides of the battery monomer 20, and the pressure relief mechanism 254 can be arranged on one of the left, right, upper, and lower sides of the shell 25.

[0205] In the embodiments of the present application, the pressure relief mechanism 254 is arranged on the surface of the shell 25 other than the first side wall 251. When the internal pressure of the battery monomer 20 exceeds the threshold value, the pressure relief mechanism 254 cracks before other walls of the shell 25, thereby releasing the internal pressure, avoiding the risk of cracking of the first side wall 251 when the internal pressure of the battery monomer 20 is too high, reducing the impact of the internal pressure of the battery monomer 20 being too high on the pole assembly 21, and further reducing the safety risk.

[0206] In some embodiments, the shell 25 is provided with a mounting hole (not shown), and the pole assembly 21 is entirely covered outside the mounting hole (not shown), or part of the pole assembly 21 is covered outside the mounting hole (not shown), and part of the pole assembly 21 penetrates into the shell 25 through the mounting hole (not shown) to cooperate with the shell 25.

[0207] Specifically, the shape of the mounting hole (not shown) can match the cross-sectional shape of the pole assembly 21. For example, the pole assembly 21 is in the shape of a long strip, and the mounting hole (not shown) is also in the shape of a long strip with a size close to or the same as that of the pole assembly 21. When the pole assembly 21 is entirely covered outside the mounting hole (not shown), the pole assembly 21 is entirely located outside the shell 25. When the pole assembly 21 partially penetrates into the mounting hole (not shown), the part of the pole assembly 21 that penetrates into the mounting hole (not shown) can be buckled with the shell 25 and connected with the electrode assembly 26.

[0208] When the pole assembly 21 is entirely covered outside the mounting hole (not shown), the assembly of the pole assembly 21 and the shell 25 is facilitated, the manufacturing process is simplified, the reliability and stability of the connection between the first pole 23 and the shell 25 are improved, and the first pole 23 is less likely to be separated from the shell 25 or cracked or damaged due to vibration or external pulling after the cooperation between the first pole 23 and the shell 25 during the charging and discharging process of the battery monomer 20.

[0209] When the pole assembly 21 is partially covered outside the mounting hole (not shown) and partially penetrates into the shell 25 through the mounting hole (not shown) to cooperate with the shell 25, the electrical connection stability and overcurrent capacity between the pole assembly 21 and the electrode assembly 26 in the shell 25 are improved.

[0210] Please refer to FIG. 3, in some embodiments, the shell 25 comprises a shell body 252 and a cover 253, the shell body 252 has an opening 2521, and the cover 253 seals the opening 2521; the pole assembly 21 is arranged in any one of the shell body 252 and the cover 253.

[0211] Specifically, the cover 253 can be covered at the opening 2521 of the shell body 252 to isolate the internal environment of the battery monomer 20 from the external environment. Without limitation, the shape of the cover 253 can be adapted to the shape of the shell body 252 to fit the shell body 252. Alternatively, the cover 253 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the cover 253 is not easy to deform when subjected to extrusion collision, so that the battery monomer 20 can have higher structural strength, and the safety performance can also be improved.

[0212] The pole assembly 21 is arranged in any one of the shell body 252 and the cover 253, and the pole assembly 21 is electrically connected with the electrode assembly 26 for outputting or inputting the electric energy of the battery monomer 20. The material of the cover 253 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitation on this. In some embodiments, an insulating piece can also be arranged on the inner side of the cover 253, which can be used to isolate the electrically connected components in the shell body 252 from the cover 253 to reduce the risk of short circuit. Exemplarily, the insulating piece can be plastic, rubber, etc.

[0213] It should be noted that in the embodiment in which the pressure relief mechanism 254 is arranged on the cover 253, the pole assembly 21 is only arranged on the shell body 252. In the embodiment in which the pressure relief mechanism 254 is arranged on the shell body 252, the pole assembly 21 is arranged on the cover 253 or on the side of the shell body 252 different from the pressure relief mechanism 254.

[0214] The shell body 252 and the cover 253 can be independent components, and the opening 2521 can be arranged on the shell body 252, and the cover 253 is covered on the opening 2521 to form the internal environment of the battery monomer 20. Without limitation, the cover 253 and the shell body 252 can also be integrated, specifically, the cover 253 and the shell body 252 can form a common connecting surface before other components enter the shell, and when it is necessary to encapsulate the inside of the shell body 252, the cover 253 is covered on the shell body 252.

[0215] In the embodiments of the present application, the shell body 252 has an opening 2521, and the cover 253 seals the opening 2521; the pole assembly 21 is arranged in any one of the shell body 252 and the cover 253, which is convenient for the assembly and production of the shell 25 and the electrode assembly 26.

[0216] Optionally, referring to FIG. 27 and FIG. 28, the shell 25 is formed with a receiving groove 257 on the surfaces of the battery monomer 20 opposite to each other along the first direction, i.e. on the two first side walls 251, the receiving groove 257 is recessed towards the inside of the battery monomer 20 relative to the surface of the battery monomer 20 where the receiving groove 257 is located, and the receiving groove 257 is used to accommodate the pole assembly 21. The first pole 23 and the second pole 24 of the two battery monomers 20 adjacent along the first direction are inserted into the receiving groove 257. The receiving groove 257 can be located at the end of the shell 251. For example, the first side wall 251 is rectangular, and the receiving groove 257 is formed at two opposite corners of the first side wall 251.

[0217] It can be understood that, in this embodiment, the first direction is the up-down direction in FIG. 27 and the direction perpendicular to the paper in FIG. 28. In combination with FIG. 2, the receiving groove 257 is recessed on the surface of the battery monomer 20 and is used to accommodate the pole assembly 21 and the electric connection column 30, so that when the two adjacent battery monomers 20 are connected, the pole assembly 21 and the electric connection column 30 are accommodated in the receiving groove 257, the distance between the two adjacent battery monomers 20 along the first direction can be shortened, and the battery device 100 can be configured with more battery monomers 20 in a limited volume space, thereby improving the energy density.

[0218] Optionally, referring to FIG. 27 and FIG. 28, the battery monomer 20 is in a flat cuboid shape as a whole, and the length dimension of the battery monomer 20 is much larger than the width dimension and the height dimension of the battery monomer 20. The pole assembly 21 can extend along the width direction of the battery monomer 20 and is arranged close to the end of the battery monomer 20 along the length direction. In this embodiment, the length dimension of the pole assembly 21 is smaller than that when the pole assembly 21 extends along the length direction of the battery monomer 20, and the pole assembly 21 is in a short flat structure. The pole assembly 21 is formed with a protruding insertion part (not shown in the figure) or an inwardly recessed insertion groove 392 to be inserted into the pole assembly 21 of another battery monomer 20 in the receiving groove 257.

[0219] In a second aspect, the embodiments of the present application provide a battery device 100, which comprises the battery monomer 20 of any of the above-mentioned embodiments, and the two first side walls 251 of the battery monomer 20 are opposite to each other along the first direction, and the number of the battery monomers 20 is a plurality and the battery monomers 20 are arranged along the first direction.

[0220] In the battery device 100 of the technical scheme of the present application, the pole assembly 21 is arranged on the first side wall 251 with the largest area in the battery monomer 20, so that the area of the pole assembly 21 can be increased, thereby increasing the overcurrent area of the electrical connection of the battery monomer 20 and ensuring the fast charging performance. At the same time, the battery monomer 20 expands during use, and the first side wall 251 with the largest area has a larger expansion force relative to other side walls, so that the insertion stability of the pole assembly 21 between the first side walls 251 is better. In addition, the first pole 23 and the second pole 24 are connected by mutual insertion, which is also conducive to the repeated step-by-step use of the battery monomer 20 and improves the maintainability of the battery.

[0221] Please refer to FIG. 5. In some embodiments, the battery device 100 includes an adapter (not shown), a plurality of battery monomers 20 are arranged in a first direction to form a plurality of battery groups 30, and the plurality of battery groups 30 are arranged in a second direction. In the two adjacent battery groups 30 along the second direction, one of the battery monomers 20 at the head or tail end along the first direction is connected with the adapter (not shown) to realize the electrical connection of the two adjacent battery groups 30.

[0222] Optionally, in FIG. 2, the first direction is the front-back direction, the second direction is the left-right direction, and the third direction is the up-down direction. A plurality of battery monomers 20 are arranged in a row along the first direction, and each row of battery monomers 20 forms a battery group 30. A plurality of battery groups 30 are arranged in the second direction. In the first direction, the two pole assemblies 21 of the two adjacent battery monomers 20 are connected, thereby realizing the electrical connection within one battery group 30. Optionally, in the same battery group 30, the two adjacent battery monomers 20 are connected in series.

[0223] Optionally, in FIG. 2, the battery device 100 includes four battery groups 30, and the four battery groups 30 are arranged in a 2x2 manner. The number of battery monomers 20 in each battery group 30 can be the same or different. The battery groups 30 can be connected in series, in parallel, or in a mixed manner.

[0224] Optionally, the adapter (not shown) is a block-shaped, plate-shaped, strip-shaped, or sheet-shaped structure made of metal material, for example, the adapter (not shown) can be a copper bar or a copper strip.

[0225] In the embodiments of the present application, the adapter (not shown) is connected with the head end or tail end of the two adjacent battery groups 30 in the first direction to realize the electrical connection of the two adjacent battery groups 30 and improve the grouping efficiency of the battery device 100.

[0226] In some embodiments, the adapter (not shown) is formed with a second insertion slot (not shown) or a second insertion part (not shown) and is inserted with the battery monomer 20.

[0227] Specifically, the first side wall 251 on the front side of the battery cell 20 located at the frontmost of the battery pack 30 in the first direction can be formed with the insertion groove 241 and / or the insertion part 231, and correspondingly, the adapter (not shown in the figure) is formed with the second insertion groove (not shown in the figure) to be inserted, and / or the adapter (not shown in the figure) is formed with the second insertion part (not shown in the figure) to be inserted into the insertion groove 241. The first side wall 251 on the rear side of the battery cell 20 located at the last of the battery pack 30 in the first direction can be formed with the insertion groove 241 and / or the insertion part 231, and correspondingly, the adapter (not shown in the figure) is formed with the second insertion groove (not shown in the figure) to be inserted, and / or the adapter (not shown in the figure) is formed with the second insertion part (not shown in the figure) to be inserted into the insertion groove 241.

[0228] In the embodiments of the present application, the adapter (not shown in the figure) is inserted into the battery cell 20 through the second insertion groove (not shown in the figure) or the second insertion part (not shown in the figure), so as to realize the electrical connection between the adapter (not shown in the figure) and the battery cell 20, and ensure good stability of the electrical connection.

[0229] Please refer to FIGS. 23-24. In some embodiments, the battery device 100 comprises a sampling member 41 which directly contacts the pole column assembly 21 to collect parameter information of at least one of the two adjacent battery cells 20.

[0230] Optionally, the sampling member 41 collects parameter information of the battery cell 20 in which the pole column assembly 21 directly contacts. In another example, the two adjacent battery cells 20 arranged in the first direction are electrically connected by the insertion of the two pole column assemblies 21, and the sampling member 41 abuts against the two mutually inserted pole column assemblies 21 to collect parameter information of the two mutually inserted pole column assemblies 21.

[0231] Optionally, the sampling member 41 can be a voltage sampling structure of the battery cell 20 to sample voltage information of the battery cell 20 by directly contacting the pole column assembly 21. The sampling member 41 is a contact type electrical connection structure.

[0232] In the embodiments of the present application, the sampling member 41 directly contacts the pole column assembly 21 to improve the accuracy and synchronism of collecting parameter information of the battery cell 20.

[0233] In some embodiments, the contact mode of the sampling member 41 with the pole column assembly 21 comprises at least one of the following:

[0234] The sampling member 41 contacts at least one of the connected first pole column 23 and second pole column 24 in the axial direction L of the pole column assembly 21;

[0235] The sampling member 41 contacts at least one of the connected first pole column 23 and second pole column 24 in the circumferential direction of the pole column assembly 21.

[0236] The sampling member 41 contacts at least one of the connected first pole post 23 and second pole post 24 in the radial direction D of the pole post assembly 21.

[0237] In FIGS. 23-24, the circumferential direction of the pole post assembly 21 is a direction around the axial direction L of the pole post assembly 21, the radial direction D of the pole post assembly 21 can be perpendicular to the axial direction L of the pole post assembly 21, the first direction can be parallel to the axial direction L of the pole post assembly 21, or the first direction can coincide with the axial direction L of the pole post assembly 21.

[0238] The contact manner of the sampling member 41 with the pole post assembly 21 includes at least one of the following:

[0239] The sampling member 41 contacts at least one of the connected first pole post 23 and second pole post 24 in the axial direction L of the pole post assembly 21 (hereinafter referred to as contact manner one), as shown in FIG. 23;

[0240] The sampling member 41 contacts at least one of the connected first pole post 23 and second pole post 24 in the circumferential direction of the pole post assembly 21 (hereinafter referred to as contact manner two), as shown in FIG. 24;

[0241] The sampling member 41 contacts at least one of the connected first pole post 23 and second pole post 24 in the radial direction D of the pole post assembly 21 (hereinafter referred to as contact manner three).

[0242] In one embodiment, the contact manner of the sampling member 41 with the pole post assembly 21 is contact manner one. In contact manner one, the sampling member 41 can contact one of the first pole post 23 and the second pole post 24, or both the first pole post 23 and the second pole post 24 in the axial direction L of the pole post assembly 21. Contact manner one can be suitable for installing the sampling member 41 in a scenario where the space in the axial direction L of the pole post assembly 21 is more than the space in the circumferential and radial directions D of the pole post assembly 21, including but not limited to.

[0243] In one embodiment, the contact manner of the sampling member 41 with the pole post assembly 21 is contact manner two. In contact manner two, the sampling member 41 can contact one of the first pole post 23 and the second pole post 24, or both the first pole post 23 and the second pole post 24 in the circumferential direction of the pole post assembly 21. Contact manner two can be suitable for installing the sampling member 41 in a scenario where the space in the circumferential direction of the pole post assembly 21 is more than the space in the axial direction L and the radial direction D of the pole post assembly 21, including but not limited to.

[0244] In one embodiment, the contact manner of the sampling member 41 with the pole assembly 21 is contact manner three. In contact manner three, the sampling member 41 can be in contact with one of the first pole 23 and the second pole 24 in the radial direction D of the pole assembly 21, or can be in contact with both the first pole 23 and the second pole 24. Contact manner three can be suitable for installing the sampling member 41 in scenarios including, but not limited to, a scenario where there is more space in the radial direction D of the pole assembly 21 and less space in the circumferential direction and the axial direction L of the pole assembly 21.

[0245] In one embodiment, the contact manner of the sampling member 41 with the pole assembly 21 includes contact manner one and two. Alternatively, the sampling member 41 can be in contact with one of the first pole 23 and the second pole 24 in the axial direction L of the pole assembly 21, and in contact with the other of the first pole 23 and the second pole 24 in the circumferential direction of the pole assembly 21. Alternatively, the sampling member 41 can be in contact with one of the first pole 23 and the second pole 24 in the axial direction L and the circumferential direction of the pole assembly 21, and in contact with the other of the first pole 23 and the second pole 24 in the circumferential direction and the axial direction L of the pole assembly 21. Alternatively, the sampling member 41 can be in contact with one of the first pole 23 and the second pole 24 in the axial direction L of the pole assembly 21, and in contact with the other of the first pole 23 and the second pole 24 in the axial direction L and the circumferential direction of the pole assembly 21.

[0246] In one embodiment, the contact manner of the sampling member 41 with the pole assembly 21 includes contact manner one and three. Alternatively, the sampling member 41 can be in contact with one of the pole assemblies 21 in the axial direction L of the pole assembly 21, and in contact with the other of the pole assemblies 21 in the radial direction D of the pole assembly 21. Alternatively, the sampling member 41 can be in contact with one of the pole assemblies 21 in the axial direction L and the radial direction D of the pole assembly 21, and in contact with the other of the pole assemblies 21 in the axial direction L and the radial direction D of the pole assembly 21. Alternatively, the sampling member 41 can be in contact with one of the pole assemblies 21 in the radial direction D of the pole assembly 21, and in contact with the other of the pole assemblies 21 in the axial direction L and the radial direction D of the pole assembly 21.

[0247] In one embodiment, the contact mode of the sampling member 41 with the pole assembly 21 includes contact modes two and three. Optionally, the sampling member 41 can be in contact with one of the pole assemblies 21 in the circumferential direction of the pole assembly 21, and in contact with another pole assembly 21 in the radial direction D of the pole assembly 21. Optionally, the sampling member 41 can be in contact with one of the pole assemblies 21 in the circumferential direction and the radial direction D of the pole assembly 21, and in contact with another pole assembly 21 in the circumferential direction and the radial direction D of the pole assembly 21. Optionally, the sampling member 41 can be in contact with one of the pole assemblies 21 in the radial direction D of the pole assembly 21, and in contact with another pole assembly 21 in the circumferential direction and the radial direction D of the pole assembly 21.

[0248] In one embodiment, the contact mode of the sampling member 41 with the pole assembly 21 is contact mode one, two and three, and the specific contact mode is explained above. To avoid redundancy, it will not be described in detail here.

[0249] In the embodiments of the present application, the sampling member 41 can be in contact with the pole assembly 21 in at least one of the axial, circumferential and radial directions of the pole assembly 21, realizing the electrical connection between the sampling member 41 and the pole assembly 21, so as to provide a flexible sampling connection scheme for different pole assembly 21 connection modes, and the arrangement of the sampling member 41 is more flexible, which to some extent alleviates the space limitation of the sampling member 41.

[0250] Optionally, the material of the sampling member 41 includes but is not limited to nickel and copper. Optionally, the sampling member 41 is connected to the output line 42, and the output line 42 is arranged to facilitate the transmission of the electrical information of the battery monomer 20 to the control unit, such as the voltage sampling control unit.

[0251] In some embodiments, the plurality of battery monomers 20 are connected in series. In other embodiments, the plurality of battery monomers 20 are connected in parallel. In other embodiments, the plurality of battery monomers 20 are connected in series and in parallel. In the embodiments of the present application, various connection modes can be realized inside the battery device 100, thereby completing a more complex functional design.

[0252] In the first direction, the electrical connection mode of the adjacent two battery monomers 20 can be series connection or parallel connection. When the electrical connection mode of the adjacent two battery monomers 20 is series connection, the two pole assemblies 21 connected are of different types, i.e., one is a positive pole and the other is a negative pole. When the electrical connection mode of the adjacent two battery monomers 20 is parallel connection, the two pole assemblies 21 connected are of the same type, i.e., both are positive poles or both are negative poles.

[0253] According to some embodiments of the present application, the present application provides a power consuming device, the power consuming device comprising the battery device 100 of any of the above embodiments, the battery device 100 being configured to provide electric energy, or the battery cell 20 of any of the above embodiments, the battery cell 20 being configured to provide electric energy.

[0254] The power consuming device can be an apparatus or a system of any of the above application battery devices 100.

[0255] In some embodiments, the power consuming device is a vehicle, the battery device 100 comprises a box body 10, and the plurality of battery cells 20 are arranged in the box body 10; at least a part of a chassis of the vehicle forms an upper cover of the box body 10.

[0256] The battery device of the present application can form a CTB (Cell To Body) scheme.

[0257] Optionally, in an embodiment, the first part 11 can serve as an upper cover of the box body 10, and the first part 11 can form a chassis of the vehicle. In an embodiment, the first part 11 can be coupled to an open side of the second part 12, so that the first part 11 and the second part 12 jointly define an enclosed space. Optionally, in an embodiment, the first part 11 and the second part 12 can also be hollow structures each having an open side, and the open side of the first part 11 is coupled to the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0258] Optionally, in an embodiment, the chassis of the vehicle can be formed with a notch, and the battery device 100 is arranged in the notch with the first part 11 facing the chassis of the vehicle, so that the battery device 100 is assembled to the vehicle, and the first part 11 forms a part of the chassis of the vehicle.

[0259] In some embodiments, the battery device 100 further comprises the box body 10, a first expansion beam 13 and a second expansion beam 14; the first expansion beam 13 and the second expansion beam 14 are arranged in a spaced manner, and jointly define a battery compartment 15 with the box body 10, and the plurality of battery cells 20 are arranged in the battery compartment 15 in sequence, and the battery cells 20 at the ends are respectively matched with the first expansion beam 13 and the second expansion beam 14.

[0260] The battery device 100 of the present embodiment can form a CTP (Cell To Pack) scheme. Compared with a battery device 100 of an MTP (Module To Pack) scheme, the battery device 100 of the CTP scheme of the present embodiment can reduce the structural members required for fixing the battery modules, improve the space utilization in the box 10, and thus increase the number of battery cells 20 in the box 10 under the condition of the same size of the box 10, thereby increasing the energy density of the battery device 100.

[0261] Alternatively, in FIG. 2, the first expansion beam 13 and the second expansion beam 14 are arranged in a spaced manner and together with the box 10 form two battery compartments 15. A plurality of battery cells 20 are connected to form a row of battery groups along a first direction (e.g., the front-rear direction in FIG. 2), and two rows of battery groups are arranged in the two battery compartments 15 along a second direction (e.g., the left-right direction in FIG. 2). It can be understood that in other embodiments, the number of rows of battery groups includes but is not limited to one row or more than two rows.

[0262] The first expansion beam 13 and the second expansion beam 14 can be arranged at the two ends of the battery groups along the first direction. In FIG. 2, the first expansion beam 13 and the second expansion beam 14 are arranged at the front end and the rear end of a row of battery groups, respectively. The battery cells 20 at the front end of the battery group are matched with the first expansion beam 13, and the battery cells 20 at the rear end of the battery group are matched with the second expansion beam 14, so that the first expansion beam 13 and the second expansion beam 14 bind a row of battery groups in the front-rear direction (the first direction).

[0263] Alternatively, in FIG. 2, the first expansion beam 13 is matched with the largest wall surface of the shell of the battery cell 20 at the front end, and the second expansion beam 14 is matched with the largest wall surface of the shell of the battery cell 20 at the rear end. During the operation of the battery cell 20, as the electrode assembly releases gas, the expansion amount of the largest wall surface of the shell is greater than that of other wall surfaces of the shell. By matching the first expansion beam 13 and the second expansion beam 14 with the largest wall surface of the shell of the battery cell 20 at the end, respectively, the largest wall surface of the shell can be prevented from cracking to a certain extent due to the excessive expansion amount, thereby improving the safety of the battery device 100.

[0264] Alternatively, the battery device 100 further comprises a cross beam 16 and a longitudinal beam 17. The cross beam 16 connects two side plates (e.g., the left side plate and the right side plate) of the box 10 along the second direction, and the longitudinal beam 17 connects the first expansion beam 13 and the second expansion beam 14 arranged along the first direction. The cross beam 16 is connected to the longitudinal beam 17, thereby improving the structural strength of the box 10. The number of the cross beam 16 and the longitudinal beam 17 is not specifically limited in the present application. In FIG. 2, the number of the cross beam 16 and the longitudinal beam 17 is one, and one cross beam 16 and one longitudinal beam 17 are connected, thereby improving the structural strength of the box 10.

[0265] Thus, the battery cells 20 at the end portions are respectively matched with the first expansion beam 13 and the second expansion beam 14, so that the first expansion beam 13 and the second expansion beam 14 can bind the battery cells 20 when the battery cells 20 expand.

[0266] According to some embodiments of the present application, the battery device 100 optionally further comprises a box 10, a module shell (not shown in the figure) and a mounting beam (not shown in the figure), the plurality of battery cells 20 are arranged in the module shell, and the module shell is mounted in the box 10 through the mounting beam.

[0267] The battery device 100 of the present embodiment can form a MTP (Module To Pack) scheme.

[0268] Optionally, the plurality of battery cells 20 are arranged in one module shell, so as to form one battery module, and one or more battery modules can be placed in the box 10. The plurality of battery modules can be connected in series, connected in parallel or connected in a mixed manner. The plurality of battery cells 20 in one module shell can be connected in series, connected in parallel or connected in a mixed manner.

[0269] The mounting beam can be fixed in the box 10 and connected to the module shell so as to fix the battery module in the box 10. The fixing mode can include but is not limited to welding, bolt connection and the like.

[0270] Optionally, in one embodiment, the module shell can have a frame structure, such as a square frame structure. The plurality of battery cells 20 are arranged in the space defined by the frame structure. Optionally, in one embodiment, the module shell can comprise a strap (such as a steel strap), which can bundle and fix the plurality of battery cells 20.

[0271] The module shell is mounted in the box 10 through the mounting beam, so as to assemble the plurality of battery cells 20 into a battery module, and then fix the battery module in the box 10 through the mounting beam.

[0272] In the power utilization device of the technical scheme of the present application, the pole assembly 21 is arranged on the first side wall 251 with the largest area of the battery cell 20, and the electrical connection area between the two pole assemblies 21 can also be increased to maintain a large overcurrent capacity, so as to improve the fast charging performance of the battery cell 20 and the battery device 100 and the power utilization device using the battery cell 20 to a certain extent.

[0273] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery monomer, comprising: a shell with two first side walls opposite to each other, the first side walls having a larger area than other side walls, and the two first side walls being arranged opposite to each other along a first direction; an electrode assembly arranged in the shell; a pole column assembly comprising a first pole column and a second pole column with opposite polarities, the first pole column and the second pole column being electrically connected with the electrode assembly and arranged on the two first side walls respectively, and the first pole column being configured to be inserted into a second pole column of another adjacent battery monomer to electrically connect the two adjacent battery monomers.

2. The battery cell of claim 1, wherein, The first pole column comprises an insertion part, and the second pole column is formed with an insertion groove matched with the insertion part; the insertion part can be directly inserted into the insertion groove of another adjacent battery monomer.

3. The battery cell of claim 2, wherein, The insertion part protrudes from the first side wall where the first pole column is located; the second pole column is formed with an insertion groove recessed in the first side wall where the second pole column is located.

4. The battery cell of claim 2, wherein, The insertion part protrudes from the first side wall where the first pole column is located, the second pole column protrudes from the first side wall where the second pole column is located, the end of the second pole column protruding from the first side wall is formed with an insertion groove, the insertion groove is recessed towards the first side wall relative to the end of the second pole column, and the recessed depth of the insertion groove is less than or equal to the height of the second pole column protruding from the first side wall.

5. The battery cell according to claim 3 or 4, characterized in that, The first pole column of one battery monomer is directly opposite to the second pole column of another adjacent battery monomer along the first direction, and at least a part of the insertion part is configured to be inserted into the insertion groove of another adjacent battery monomer along the first direction.

6. The battery cell of claim 1, wherein, The first pole column comprises a pole column body and an electrical connector matched with the pole column body, and one end of the electrical connector away from the pole column body is configured to be inserted into a second pole column of another adjacent battery monomer.

7. The battery cell of claim 6, wherein, The pole column body and the second pole column are both formed with an insertion groove; two ends of the electrical connector are respectively formed with two insertion parts, one of the two insertion parts is inserted into the insertion groove of the pole column body, and the other of the two insertion parts is inserted into the insertion groove of the second pole column of another adjacent battery monomer.

8. The battery cell of claim 6, wherein, The pole column body and the second pole column both protrude from the first side wall where each of them is located, and the protruding parts of the pole column body and the second pole column are respectively recessed towards the first side wall to form the insertion grooves; or The pole column body and the second pole column are both recessed towards the first side wall where each of them is located to directly form the insertion grooves.

9. The battery cell of claim 6, wherein, The pole column body and the second pole column are both provided with insertion parts, and two ends of the electrical connector are respectively formed with insertion grooves; one of the two insertion grooves is inserted into the insertion part of the pole column body, and the other of the two insertion grooves is configured to be inserted into the insertion part of the second pole column of another adjacent battery monomer.

10. The battery cell of claim 9, wherein, The pole column body and the second pole column are both protruded from the first side wall where each of them is located to directly form the insertion parts; or The first and second pole posts are recessed relative to the first sidewall and protrude with the insertion portion smaller than the recessed size at the recessed position.

11. The battery cell of any one of claims 1 to 10, wherein, The electrode assembly includes a main body portion and a tab portion connected to an end of the main body portion, the first sidewall includes a first area covering the main body portion and a second area covering the tab portion, the second area is close to an edge of the first sidewall, and the first and second pole posts are arranged in the second area and electrically connected to the tab portion.

12. The battery cell of claim 11, wherein, The main body portion includes a winding or laminated pole sheet coated with an active material layer to generate electric energy, and an area of the pole sheet coated with the active material layer is directly opposite the first area in the first direction.

13. The battery cell of claim 11, wherein, The first sidewall is square-shaped, has two short sides opposite in a second direction and two long sides opposite in a third direction, the length of the short side is smaller than that of the long side, the second direction, the third direction and the first direction are perpendicular to each other, the second area is close to one of the short side and the long side, and the first and second pole posts extend along the length direction of the short side or the long side close to the second area and are strip-shaped.

14. The battery cell of any one of claims 1-10, wherein The battery cell includes an elastic electrical connecting member arranged on the first pole post and / or the second pole post, and the electrical connecting member is used to elastically abut between the first pole post and the second pole post of an adjacent battery cell when the first pole post is inserted into the second pole post, to achieve electrical connection between two adjacent battery cells.

15. The battery cell of claim 14, wherein, The elastic electrical connecting member is distributed along the circumferential direction of the pole post assembly.

16. The battery cell of claim 14 or 15, wherein, The elastic electrical connecting member includes a first end and a second end, the first end is fixedly connected to the first pole post or the second pole post, and the second end is movably connected to the first pole post or the second pole post.

17. The battery cell of claim 16, wherein, The pole post assembly is provided with a recess, and the battery cell is configured such that when the elastic electrical connecting member is deformed during assembly of the first pole post and the second pole post, the second end is inserted into the recess to release the stress of the elastic electrical connecting member.

18. The battery cell of any one of claims 1-17, wherein, The battery cell includes a pressure relief mechanism arranged on a surface of the shell different from the first sidewall, and the pressure relief mechanism is used to crack the shell first when the internal pressure of the battery cell exceeds a pressure threshold.

19. The battery cell of any one of claims 1-17, wherein, The shell is provided with a mounting hole, and the entire pole post assembly is arranged outside the mounting hole. Alternatively, part of the pole post assembly is arranged outside the mounting hole, and part of the pole post assembly penetrates into the shell through the mounting hole and cooperates with the shell.

20. The battery cell of claim 19, wherein, The shell includes a shell body and a cover, the shell body has an opening, and the cover seals the opening; and the pole post assembly is arranged in either of the shell body and the cover.

21. A battery device, characterized by The battery device includes: The battery cell of any one of claims 1-20, two first sidewalls of the battery cell are opposite in a first direction, and the number of battery cells is multiple and arranged in the first direction.

22. The battery device of claim 21, wherein, The battery device comprises a connector, a plurality of the battery cells are arranged along the first direction to form a plurality of battery groups, and the plurality of battery groups are arranged along a second direction, wherein, in the two adjacent battery groups along the second direction, one of the battery cells at the end along the first direction is connected with the connector to realize electrical connection of the two adjacent battery groups.

23. The battery device of claim 22, wherein, The connector is formed with a second insertion slot or a second insertion part and is inserted with the battery cell.

24. The battery device of claim 21, wherein, The battery device comprises a sampling member which is directly in contact with the pole assembly to collect parameter information of at least one of the two adjacent battery cells.

25. The battery device of claim 24, wherein, The contact mode of the sampling member with the pole assembly comprises at least one of the following: The sampling member is in contact with at least one of the first pole and the second pole in the axial direction of the pole assembly; The sampling member is in contact with at least one of the first pole and the second pole in the circumferential direction of the pole assembly; The sampling member is in contact with at least one of the first pole and the second pole in the radial direction of the pole assembly.

26. The battery device of claim 21, wherein, The battery device further comprises a box body, a first expansion beam and a second expansion beam; the first expansion beam and the second expansion beam are arranged at intervals and together with the box body form a battery compartment, and a plurality of the battery cells are sequentially arranged in the battery compartment, and the battery cells at the ends are respectively matched with the first expansion beam and the second expansion beam. Alternatively, The battery device further comprises a box body, a module shell and a mounting beam, the plurality of battery cells are arranged in the module shell, and the module shell is mounted in the box body through the mounting beam.

27. An electrical device, comprising: The battery cell of any one of claims 1-20 is used to provide electric energy; or The battery device of any one of claims 21-26 is used to provide electric energy.

28. The powered device of claim 27, wherein, The electric device is a vehicle, the battery device comprises a box body, and a plurality of the battery cells are arranged in the box body; at least a part of the chassis of the vehicle constitutes an upper cover of the box body.

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