Battery monomer, battery device and electric device

Abstract

A battery cell (20), a battery device (100) and a power utilization device, the battery cell (20) comprises a housing (25), a pole assembly (21) and an elastic electrical connector (22), the pole assembly (21) is arranged on the housing (25), the pole assembly (21) comprises a first pole (23) and a second pole (24) which have opposite polarities, one of the first pole (23) and the second pole (24) is provided with a plugging part (231), and the elastic electrical connector (22) is arranged on the housing (25). The other one of the two battery monomers (20) is provided with a plug-in slot (241) of which the size is matched with that of the plug-in part (231), and the plug-in part (231) is configured to be at least partially inserted into the plug-in slot (241) of another battery monomer (20) when one battery monomer (20) is electrically connected with another adjacent battery monomer (20). And the elastic electric connecting piece (22) is arranged on at least one of the inserting part (231) and the inserting groove (241), and is configured to elastically abut between the inserting part (231) of one battery monomer (20) and the inserting groove (241) of another adjacent battery monomer (20) when one battery monomer (20) is electrically connected with another adjacent battery monomer (20), so that the electric connection of two adjacent battery monomers (20) is realized.

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 battery cells are electrically connected through two pole columns. During use of the battery device, vibration and impact often occur, which may cause insufficient contact of the electrical contact surface, poor electrical connection reliability of the two pole columns, and thus small overcurrent capacity, excessive local resistance, serious heating and even safety problems.

[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 avoid or alleviate the problem of poor electrical connection reliability of the two pole columns to a certain extent.

[0005] In a first aspect, the present application provides a battery cell, which comprises:

[0006] a shell;

[0007] a pole column assembly arranged on the shell, the pole column assembly comprising first and second pole columns with opposite polarities, one of the first and second pole columns being provided with a plug-in part, and the other of the first and second pole columns being provided with a plug-in slot with a size adapted to the plug-in part, the plug-in part being configured to be at least partially inserted into the plug-in slot of another battery cell when one battery cell is electrically connected to the other battery cell;

[0008] a resilient electrical connecting piece arranged in at least one of the plug-in part and the plug-in slot, and configured to elastically abut between the plug-in part of one battery cell and the plug-in slot of another adjacent battery cell when the one battery cell is electrically connected to the other battery cell, so as to achieve electrical connection of the two adjacent battery cells.

[0009] In the battery cell of the present application, the resilient electrical connecting piece is arranged in at least one of the plug-in part and the plug-in slot, and is configured to elastically abut between the plug-in part of one battery cell and the plug-in slot of another adjacent battery cell when the one battery cell is electrically connected to the other battery cell, so as to achieve electrical connection of the two adjacent battery cells. Thus, the resilient electrical connecting piece can keep the two pole columns of the two adjacent battery cells in sufficient contact under static and dynamic conditions such as vibration and impact, thereby increasing the electrical contact area of the two battery cells to a certain extent, reducing overcurrent impedance and heating problems, improving the electrical connection reliability of the two battery cells, and reducing or avoiding safety problems.

[0010] In some embodiments, the elastic electrical connecting member extends along the length extension direction of the corresponding first pole or second pole.

[0011] In the above embodiments, the elastic electrical connecting member extends along the length extension direction of the corresponding first pole or second pole, so that the part of the elastic electrical connecting member abutting against the first pole or second pole is distributed more uniformly along the length extension direction of the corresponding first pole or second pole, avoiding that the elastic electrical connecting member is more stable in local connection with the first pole or second pole and unstable in local connection with the first pole or second pole, resulting in higher local creeping potential.

[0012] In some embodiments, the elastic electrical connecting member includes a plurality of elastic connecting portions, and the plurality of elastic connecting portions are arranged at intervals along the length extension direction of the corresponding first pole or second pole, or the elastic electrical connecting member includes one elastic connecting portion, and the one elastic connecting portion is arranged continuously along the length extension direction.

[0013] In the above embodiments, the plurality of elastic connecting portions or the one elastic connecting portion are arranged at intervals along the length extension direction of the corresponding first pole or second pole, so as to improve the stability of the elastic electrical connecting member abutting against the first pole or second pole to a certain extent.

[0014] In some embodiments, the elastic connecting portion includes a plurality of connecting portions, and the plurality of connecting portions are arranged at intervals along the insertion direction of the first pole and the second pole.

[0015] In the above embodiments, the plurality of connecting portions are arranged at intervals along the insertion direction of the first pole and the second pole, and the first pole and the second pole can form an electrical connection through the plurality of elastic connecting portions, so as to improve the electrical contact area of the adjacent two battery monomers to a certain extent, reduce the overcurrent impedance and heat generation, improve the electrical connection reliability of the adjacent two battery monomers, and reduce or avoid safety problems.

[0016] In some embodiments, the elastic connecting portion includes two connecting portions, which are a first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are arranged at intervals along the insertion direction of the corresponding first pole and second pole.

[0017] In the above embodiments, the elastic connecting portion includes the first connecting portion and the second connecting portion, so that the first pole and the second pole can form two electrical abutting positions through the first connecting portion and the second connecting portion, which is conducive to improving the stability of the abutment of the first pole and the second pole.

[0018] In some embodiments, the first pole or the second pole provided with the elastic connecting part is provided with a stress release slot at a position between any two adjacent connecting parts in the direction of plugging of the first pole and the second pole, and the elastic electrical connecting part is partially inserted into the stress release slot when the first pole and the second pole are plugged together.

[0019] In the above embodiments, the elastic electrical connecting part is partially inserted into the stress release slot when deformed during assembly of the first pole and the second pole, so that the stress of the elastic electrical connecting part is released, and the elastic electrical connecting part is prevented from being excessively pressed and damaged to a certain extent.

[0020] In some embodiments, among the two adjacent connecting parts on both sides of the same stress release slot, one connecting part is connected to the corresponding first pole or second pole at a position adjacent to the stress release slot and is movable relative to the first pole or second pole at a position away from the stress release slot, and the other connecting part is movable relative to the corresponding first pole or second pole at a position adjacent to the stress release slot and is connected to the first pole or second pole at a position away from the stress release slot.

[0021] In the above embodiments, among the two adjacent connecting parts on both sides of the same stress release slot, one connecting part is movable relative to the first pole or second pole at a position away from the stress release slot, so that the position is deformed when the first pole and the second pole are plugged together, and the other connecting part is movable relative to the corresponding first pole or second pole at a position adjacent to the stress release slot, so that the position is inserted into the stress release slot to release stress when the first pole and the second pole are plugged together.

[0022] In some embodiments, the elastic electrical connecting part is arranged in the plugging slot and / or the elastic electrical connecting part is arranged outside the plugging part.

[0023] In the above embodiments, the elastic electrical connecting part is arranged in the plugging slot, and the elastic electrical connecting part is not easily damaged by external objects during transportation, storage, and the like of the battery monomer, thereby providing a service life of the elastic electrical connecting part to a certain extent. The elastic electrical connecting part is arranged outside the plugging part, so that the maintenance (such as replacement, repair, etc.) of the elastic electrical connecting part is facilitated.

[0024] In some embodiments, the battery monomer includes a containing slot arranged on the first pole or the second pole, and the elastic electrical connecting part includes an elastic part arranged in the containing slot and connected to a side wall of the containing slot.

[0025] In the above embodiment, when the first pole and the second pole are assembled, the elastic electrical connecting piece is deformed by being pressed by the first pole and the second pole, and the elastic part is flattened. When the first pole and the second pole are assembled in place, the elastic part rebounds into the accommodating groove and is connected with the counterpart, thereby being in full contact with the counterpart (the second pole or the plug-in part).

[0026] In some embodiments, the accommodating groove is extended on the corresponding first pole or the second pole.

[0027] In the above embodiment, the accommodating groove is extended on the corresponding first pole or the second pole, so that the accommodating groove can be matched in position with the elastic part, and the elastic part can be in full contact with the counterpart.

[0028] In some embodiments, 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 walls, the two first side walls are arranged opposite to each other along the first direction, and the first pole and the second pole are arranged on the first side wall or on the same first side wall.

[0029] In the above embodiment, by arranging the pole assembly on the first side wall with the largest area, the area of the pole assembly can be increased, thereby increasing the overcurrent area of the electrical connection of the battery monomer and ensuring the fast charging performance. At the same time, since the battery monomer expands during use, the expansion force of the first side wall with the largest area is larger than that of the other side walls, so that the plug-in stability of the pole assembly between the first side walls is better.

[0030] In some embodiments, the first pole is provided with a plug-in part protruding from the first side wall where the first pole is located, and the plug-in groove is concave with respect to the first side wall where the second pole is located.

[0031] In the above embodiment, the plug-in part protrudes from the first side wall where the first pole is located, and the plug-in groove is concave with respect to the first side wall where the second pole is located. The two battery monomers are electrically connected by being inserted into the plug-in groove through the plug-in part. The part of the first pole 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, thereby saving space and being conducive to improving the energy density.

[0032] In some embodiments, the first pole is provided with a plug-in part protruding from the first side wall where the first pole is located, and the second pole protrudes from the first side wall where the second pole is located. The end part of the second pole protruding from the first side wall forms a plug-in groove. The plug-in groove is concave with respect to the end part of the second pole towards the first side wall, and the depth of the concave plug-in groove is less than or equal to the height of the second pole protruding from the first side wall.

[0033] In the above embodiment, the insertion part protrudes from the first side wall where the first pole is located, and the insertion groove is recessed in the first side wall where the second pole is located, and the first pole and the second pole of the two adjacent battery monomers are electrically connected by inserting the insertion part into the insertion groove, thereby efficiently connecting the two battery monomers and improving the grouping efficiency of the battery device to a certain extent.

[0034] In some embodiments, the first pole of one battery monomer is directly opposite the second pole of another battery monomer adjacent in the first direction, and the battery monomer is configured to insert at least part of the insertion part into the insertion groove of the another battery monomer adjacent in the first direction.

[0035] In the above embodiment, the first pole of one battery monomer is directly opposite the second pole of another battery monomer adjacent in the first direction, and the insertion part of the first pole is partially or completely inserted into the insertion groove of the second pole of the another battery monomer, so that the two adjacent battery monomers are inserted into each other in the first direction through the first pole and the second pole, thereby realizing stable and reliable electrical connection.

[0036] In some embodiments, the battery monomer includes an electrode assembly disposed in the shell, the electrode assembly includes a main body part and a tab part connected to an 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 disposed in the second region and electrically connected to the tab part.

[0037] In the above embodiment, the first region covers the main body part, and the second region covers the tab part, and during use of the battery monomer, the first side wall expands and deforms greatly in the first region, and the first pole and the second pole are disposed in the second region, so that the pole assembly is less affected by the expansion of the electrode assembly. In addition, the pole assembly is disposed close to the edge of the first side wall, thereby improving the high-voltage protection in the case of assembly, maintenance, etc.

[0038] In some embodiments, the main body part includes a winding or laminated pole piece, the pole piece is coated with an active material layer to generate electric energy, and the region of the pole piece coated with the active material layer is directly opposite the first region in the first direction.

[0039] In the above embodiment, the region of the pole piece coated with the active material layer is directly opposite the first region in the first direction, thereby minimizing the influence of the expansion and deformation of the pole piece on the stability of the insertion of the pole assembly.

[0040] In some embodiments, the first side wall 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 sides is less than that of the long sides, 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 sides and the long sides, and the first pole column and the second pole column extend along the length of the short side or the long side close to the second region and are in a strip shape.

[0041] In the above embodiments, the pole column assembly extends along the length of the close short side or long side and is in a strip shape, which is conducive to dispersing stress in the length direction of the edge of the first side wall and improving the structural stability of the pole column assembly during plugging.

[0042] In some embodiments, the battery monomer comprises a pressure relief mechanism arranged on a surface of the shell other than the first side wall, and the pressure relief mechanism is used to crack before the shell when the internal pressure of the battery monomer exceeds a pressure threshold.

[0043] In the above embodiments, the pressure relief mechanism is arranged on a surface of the shell other than the first side wall, and when the internal pressure of the battery monomer exceeds the threshold, the pressure relief mechanism cracks before other walls of the shell, 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 impact of the internal pressure of the battery monomer being too large on the pole column assembly, and further reducing the safety risk.

[0044] In some embodiments, the shell is provided with a mounting hole, and the pole column assembly is entirely arranged outside the mounting hole.

[0045] In the above embodiments, the pole column assembly is entirely arranged outside the mounting hole, which facilitates the assembly of the pole column assembly and the shell, simplifies the manufacturing process, and improves the reliability and stability of the connection between the pole column assembly and the shell, so that the pole column assembly and the shell are not easily separated from each other or cracked or damaged due to vibration or external pulling after being matched.

[0046] In some embodiments, part of the pole column assembly is arranged outside the mounting hole, and part of the pole column assembly penetrates into the shell through the mounting hole and cooperates with the shell.

[0047] In the above embodiments, part of the pole column assembly is arranged outside the mounting hole and penetrates into the shell through the mounting hole and cooperates with the shell, which is conducive to improving the stability of the electrical connection between the pole column assembly and the electrode assembly in the shell and the overcurrent capacity.

[0048] In some embodiments, the shell comprises a shell body and a cover body, the shell body has an opening, and the cover body is arranged to seal the opening; and the pole column assembly is arranged in either of the shell body and the cover body.

[0049] In the above embodiment, the shell body has an opening, the cover body sealing the opening; the pole column assembly is arranged in any one of the shell body and the cover body, facilitating the assembly production of the shell body and the pole column assembly.

[0050] In some embodiments, the first pole column or the second pole column comprises a pole column body and an electric connection column connected with the pole column body, the electric connection column is provided with an elastic electric connection piece, and an end of the electric connection column away from the pole column body is configured to be inserted with the second pole column or the first pole column of another adjacent battery monomer.

[0051] In the above embodiment, by configuring the end of the electric connection column away from the pole column body to be inserted with the second pole column or the first pole column of another adjacent battery monomer, the electric connection of two battery monomers is realized, which replaces the connection mode of welding the gasket with the pole column of the adjacent battery monomer to realize the electric connection of the battery monomer, thereby improving the defects such as virtual welding and burst hole caused by welding the gasket with the pole column, and improving the reliability of the electric connection between the battery monomers; on the other hand, by connecting the pole column body and the second pole column of the adjacent battery monomers through the electric connection column, compared with directly inserting the pole column bodies of the adjacent battery monomers with each other, not only the shape of each pole column body can be uniformly standardized to ensure the manufacturing efficiency of the pole column body, but also the distance between the adjacent battery monomers can be adjusted through the intermediate electric connection column to adapt to the expansion of the battery monomer, which can further improve the reliability of the electric connection between the battery monomers.

[0052] In some embodiments, the pole column body and the second pole column or the first pole column are each formed with an insertion slot; the two ends of the electric connection column are each formed with an insertion part, one of the two insertion parts is inserted with the insertion slot of the pole column body, and the other of the two insertion parts is inserted with the insertion slot of the second pole column or the first pole column of the adjacent battery monomer.

[0053] In the above embodiment, the electric connection between the pole column body, the electric connection column and the second pole column is realized by inserting the insertion part into the insertion slot, which is relatively simple to operate and stable in connection. At the same time, the two battery monomers that have completed the electric connection can be exempted from welding cooperation, thereby avoiding the problem that the electrode assembly is easily damaged when the pole column assembly welding position is disassembled.

[0054] In some embodiments, the pole column body and the second pole column or the first pole column each protrude from the side wall of the shell body, and the protruding part of the pole column body and the second pole column or the first pole column is recessed in the direction close to the side wall of the shell body to form the insertion slot respectively.

[0055] In the above embodiment, the pole column body and the second pole column each protrude from the side wall of the shell body, thereby reducing the influence of pole column damage on the electrode assembly and other structures inside the battery monomer. In addition, it is convenient to make and assemble in the case that the first pole column and the second pole column are separately formed with the battery monomer.

[0056] In some embodiments, the pole body and the second pole or the first pole are both recessed inwardly relative to the side wall of the shell in which each is located to directly form the insertion slot.

[0057] In the above embodiments, the pole body and the second pole are recessed inwardly from the side wall of the shell in which each is located to form the insertion slot, so that the electric connection column is directly inserted into the inner side of the surface of the battery monomer, the pole is not easy to deform in the case of collision, extrusion, pulling and the like, and the insertion structure of the insertion slot and the electric connection column is relatively stable.

[0058] In some embodiments, the pole body and the second pole or the first pole are both provided with an insertion part, and the two ends of the electric connection column are respectively formed with an insertion slot; one of the two insertion slots is inserted with the insertion part of the pole body, and the other of the two insertion slots is configured to be inserted with the insertion part of the second pole or the first pole of the adjacent battery monomer.

[0059] In the above embodiments, the electric connection between the pole body, the electric connection column and the second pole is achieved by inserting the insertion part into the insertion slot, which is relatively simple to operate and stable in connection. Meanwhile, the two battery monomers that have completed the electric connection can be exempted from welding cooperation, thereby avoiding the problem that the electrode assembly is easily damaged when the pole assembly welding position is disassembled.

[0060] In some embodiments, the pole body and the second pole or the first pole are both protruded on the side wall of the shell in which each is located to directly form the insertion part.

[0061] In the above embodiments, the pole body and the second pole are protruded on the side wall of the shell in which each is located, thereby reducing the influence of the damage of the pole assembly on the electrode assembly and other structures inside the battery monomer. In addition, it is convenient to manufacture and assemble when the pole assembly and the battery monomer are separately formed.

[0062] In some embodiments, the pole body and the second pole or the first pole are both recessed relative to the side wall of the shell in which each is located, and an insertion part protruded at the recessed position is smaller than the recessed size.

[0063] In the above embodiments, the pole body and the second pole are recessed from the side wall of the shell in which each is located to the inside of the shell, so that the electric connection column is directly inserted into the inner side of the surface of the battery monomer, the insertion part and the insertion slot are inserted on the inner side of the surface of the battery monomer, thereby reducing external interference and improving the connection reliability of the electric connection column and the battery monomer.

[0064] In a second aspect, the present application provides a battery device, which comprises:

[0065] A plurality of battery monomers of any of the above embodiments are arranged in a stack along a first direction, and the insertion part of one adjacent battery monomer is electrically connected with the insertion slot of another battery monomer through an elastic electric connection piece.

[0066] In some embodiments, the battery device comprises conductive glue, which is located in the insertion slot and connects the insertion part and the first or second pole column.

[0067] In the above embodiments, the conductive glue connects the insertion part and the second pole column, thereby increasing the overcurrent contact surface of the first and second pole columns and improving the electrical conductivity.

[0068] In some embodiments, the insertion part comprises a first end surface in the first direction, which is located in the insertion slot, the first or second pole column comprises a second end surface in the first direction towards the insertion slot, the conductive glue connects the first end surface and the second end surface, and the elastic electrical connector connects the circumferential surface of the first or second pole column towards the insertion slot and the circumferential surface of the insertion part.

[0069] In the above embodiments, in the first direction, the conductive glue connects the first end surface of the insertion part and the second end surface of the first or second pole column towards the insertion slot, so that the first and second pole columns can be connected in both the circumferential direction of the pole column assembly and the first direction, thereby enabling the first and second pole columns to be in sufficient contact.

[0070] In some embodiments, the insertion part is connected to the insertion slot in an interference fit manner.

[0071] In the above embodiments, the contact between the insertion part and the surface of the pole column towards the insertion slot can be a hard contact, forming an interference fit, and a pre-tightening force is formed between the insertion part and the pole column, so that the insertion part and the pole column are in more sufficient contact.

[0072] In some embodiments, the battery device comprises a sampling member, in the first direction, the first pole column of one adjacent battery cell is inserted with the second pole column of another battery cell, and the sampling member directly contacts the first and / or second pole column to collect the corresponding parameter information of the adjacent battery cell.

[0073] In the above embodiments, by directly contacting the first and / or second pole column with the sampling member to collect the parameter information of the corresponding battery cell, the sampling method can be adapted to battery devices that cannot be designed with a gasket structure or a gasket structure that cannot be provided with a sampling structure, thereby improving the adaptability of the sampling method to the battery device. At the same time, directly collecting the information of the pole column can also ensure the accuracy and reliability of the battery cell parameter information.

[0074] In some embodiments, the contact mode of the sampling member with the pole column assembly comprises at least one of the following:

[0075] The sampling member directly contacts at least one of the first and second pole columns in the axial direction of the pole column assembly;

[0076] The sampling member is in direct contact with at least one of the first pole column and the second pole column in the circumferential direction of the pole column assembly;

[0077] The sampling member is in direct contact with at least one of the first pole column and the second pole column in the radial direction of the pole column assembly.

[0078] In the above embodiments, the sampling member is in direct contact with the pole column assembly in at least one of the axial direction, the circumferential direction and the radial direction of the pole column assembly, so as to realize the electrical connection between the sampling member and the pole column assembly, thereby providing a flexible sampling connection scheme for different pole column assembly connection modes, and the arrangement of the sampling member is more flexible, which to some extent alleviates the limitation of the space of the battery device on the sampling member.

[0079] In some embodiments, the plurality of battery monomers are connected in series; or,

[0080] The plurality of battery monomers are connected in parallel; or,

[0081] The plurality of battery monomers are connected in series and in parallel.

[0082] In the above embodiments, the battery device can realize diversified connection modes, thereby completing more complex functional designs.

[0083] In a third aspect, the present application provides a power consumption device, which comprises the battery monomer of any one of the above embodiments, and the battery monomer is used to provide electric energy, or the battery device of any one of the above embodiments, and the battery device is used to provide electric energy.

[0084] In the battery device and the power consumption device of the embodiments of the present application, the elastic electrical connecting member is arranged in at least one of the plug-in part and the plug-in slot, and is configured to elastically abut between the plug-in part of one battery monomer and the plug-in slot of another adjacent battery monomer when the one battery monomer is electrically connected with the another adjacent battery monomer, so as to realize the electrical connection between the two adjacent battery monomers, thereby enabling the elastic electrical connecting member to keep the two pole columns of the two adjacent battery monomers in sufficient contact under static and dynamic conditions such as vibration impact, so as to to some extent increase the electrical contact area of the two battery monomers, reduce the overcurrent impedance and the heating problem, improve the electrical connection reliability of the two battery monomers, and reduce or avoid safety problems.

[0085] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented in accordance with the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0086] 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 intended to depict only preferred embodiments of the application, and therefore should not be considered to narrow the scope of the present application. Additionally, like reference numerals are intended to represent similar components, portions and features in the various drawings and embodiments. In the drawings:

[0087] FIG. 1 is a schematic diagram of a vehicle structure according to some embodiments of the present application;

[0088] FIG. 2 is a schematic diagram of a battery device structure according to some embodiments of the present application;

[0089] FIG. 3 is a schematic diagram of a battery device structure according to some embodiments of the present application;

[0090] FIG. 4 is a schematic diagram of a battery cell structure according to some embodiments of the present application;

[0091] FIG. 5 is a schematic diagram of two battery cells before assembly according to some embodiments of the present application;

[0092] FIG. 6 is a schematic diagram of two battery cells before assembly according to some other embodiments of the present application;

[0093] FIG. 7 is a schematic diagram of the battery cell of FIG. 4 from a front perspective according to some embodiments of the present application;

[0094] FIG. 8 is a schematic diagram of the battery cell of FIG. 5 from a front perspective according to some embodiments of the present application;

[0095] FIG. 9 is a schematic diagram of a battery module according to some embodiments of the present application;

[0096] FIG. 10 is a schematic diagram of two battery cells before assembly according to some embodiments of the present application;

[0097] FIG. 11 is a schematic diagram of a battery cell structure according to some embodiments of the present application;

[0098] FIG. 12 is a schematic diagram of two battery cells before assembly according to some embodiments of the present application;

[0099] FIGS. 13-14 are schematic diagrams of a first pole structure according to some embodiments of the present application;

[0100] FIG. 15 is a schematic diagram of a second pole structure according to some embodiments of the present application;

[0101] FIG. 16 is a schematic diagram of a cross-section of a second pole structure according to some embodiments of the present application;

[0102] FIG. 17 is a schematic diagram of two battery cells after assembly according to some embodiments of the present application;

[0103] FIG. 18 is a schematic diagram of a cross-section of two battery cells after assembly according to some embodiments of the present application;

[0104] Figure 19 is an enlarged view of part A1 of Figure 18;

[0105] Figure 20 is an enlarged view of part A2 of Figure 19.

[0106] Figure 21 is a schematic diagram of two battery cells before assembly in some embodiments of this application;

[0107] Figure 22 is a cross-sectional schematic diagram of two battery cells before assembly according to some embodiments of this application;

[0108] Figure 23 is an enlarged view of part C1 in Figure 22;

[0109] Figure 24 is an enlarged view of part C2 in Figure 23;

[0110] Figure 25 is a schematic diagram of the assembly process of two battery cells according to some embodiments of this application;

[0111] Figure 26 is a cross-sectional schematic diagram of the assembly process of two battery cells in some embodiments of this application;

[0112] Figure 27 is an enlarged view of part B1 of Figure 26;

[0113] Figure 28 is an enlarged view of part B2 of Figure 27;

[0114] Figure 29 is a schematic diagram of the first and second poles before assembly in some embodiments of this application;

[0115] Figure 30 is a partial cross-sectional schematic diagram of one of the battery devices according to some embodiments of this application;

[0116] Figure 31 is a second partial cross-sectional schematic diagram of a battery device according to some embodiments of this application;

[0117] Figure 32 is a third partial cross-sectional schematic diagram of a battery device according to some embodiments of this application;

[0118] Figure 33 is a fourth partial cross-sectional schematic diagram of a battery device according to some embodiments of this application;

[0119] Figure 34 is a schematic diagram of the structure of a battery cell according to some embodiments of this application;

[0120] Figure 35 is a schematic diagram of the structure of a single battery cell in Figure 34 from a top view.

[0121] Figure 36 is a fifth partial cross-sectional schematic diagram of a battery device according to some embodiments of this application;

[0122] Figure 37 is a partial cross-sectional schematic diagram of a battery device according to some embodiments of this application.

[0123] Main component reference signs are as follows: vehicle 1000; battery device 100, controller 200, motor 300; box body 10, first part 11, second part 12, containing space 13; battery cell 20, pole post assembly 21, stress release groove 211, containing groove 212, pole post body 213, electric connection column 214, elastic electric connection piece 22, first end 221, second end 222, elastic part 223, elastic connection part 224, first connection part 225, second connection part 226, first pole post 23, plug-in part 231, first base 232, first end face 233, second pole post 24, plug-in groove 241, groove bottom face 2411, groove inner circumferential face 2412, second base 242, matching part 243, first surface 244, second surface 245, second end face 246, opening 247, shell 25, first side wall 251, first area 2511, second area 2512, short side 2513, long side 2514, containing groove 257, electrode assembly 26, main body part 261, tab part 262, shell body 252, opening 2521, cover body 253, pressure relief mechanism 254; explosion-proof valve 30, battery management system 31, high-voltage box 32; conductive glue 40, sampling piece 41, output line 42, insulating piece 43; battery pack 50. DETAILED DESCRIPTION

[0124] 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.

[0125] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0126] 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.

[0127] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0128] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” herein generally means that the front and rear associated objects have an“or” relationship.

[0129] In the description of the embodiments of the application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0130] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0131] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0132] At present, from the development of market situation, the application of power battery device is more and more extensive. The power battery device is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery device, the demand of its market is also increasing.

[0133] In the related art, a battery device includes a plurality of battery cells, and two battery cells are electrically connected through two poles. During use, the battery device is often accompanied by vibration impact, which may cause insufficient contact of the electrical contact surface, poor electrical connection reliability of the two poles, and further cause small overcurrent capacity, excessive local resistance, serious heating, and even safety problems.

[0134] In order to avoid or alleviate the problem of poor electrical connection reliability of the two poles to some extent, the present application provides a battery cell, which includes a shell, a pole assembly, and an elastic electrical connecting piece. The pole assembly is arranged on the shell, and the pole assembly includes first and second poles with opposite polarities. One of the first and second poles is provided with a plug-in part, and the other is provided with a plug-in slot with a size matching the plug-in part. When one battery cell is electrically connected with another adjacent battery cell, the plug-in part can be at least partially inserted into the plug-in slot of the other battery cell. The elastic electrical connecting piece is arranged in at least one of the plug-in part and the plug-in slot, and is configured to elastically abut between the plug-in part of one battery cell and the plug-in slot of another adjacent battery cell when one battery cell is electrically connected with another adjacent battery cell, so as to achieve electrical connection of the two adjacent battery cells.

[0135] In such a battery cell, the elastic electrical connecting piece is arranged in at least one of the plug-in part and the plug-in slot, and is configured to elastically abut between the plug-in part of one battery cell and the plug-in slot of another adjacent battery cell when one battery cell is electrically connected with another adjacent battery cell, so as to achieve electrical connection of the two adjacent battery cells. Thus, the elastic electrical connecting piece can maintain sufficient contact between the two poles of the two adjacent battery cells under static and dynamic conditions such as vibration impact, thereby to some extent increasing the electrical contact area of the two battery cells, reducing overcurrent impedance and heating problems, improving the electrical connection reliability of the two battery cells, and reducing or avoiding safety problems.

[0136] The battery cell can be applied to a battery device. The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel, or mixed connection through a busbar component.

[0137] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells.

[0138] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells by a cable tie.

[0139] In some embodiments, the battery device can be a battery pack, which includes a box and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box.

[0140] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0141] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0142] As an example, the box can include a first box and a second box. The first box and the second box are buckled so that a closed space is formed inside the box to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box can be an upper cover or a bottom plate.

[0143] As an example, the box can include an upper cover, a frame and a bottom plate. The upper cover and the bottom plate are respectively connected with the frame, so that a closed space is formed inside the box to accommodate the battery cell assembly.

[0144] In some embodiments, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0145] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.

[0146] The following embodiments are described for convenience of illustration, taking a vehicle 1000 as an example of an electric device according to an embodiment of the present application.

[0147] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, 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 source 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 power demand of the vehicle 1000 during starting, navigation, and driving.

[0148] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0149] Please refer to FIG. 2 and FIG. 3, FIG. 2 is a structural schematic diagram of the 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 includes a box body 10 and a battery monomer 20, and the battery monomer 20 is contained in the box body 10. The box body 10 is used to provide a containing space 13 for the battery monomer 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, and the first part 11 and the second part 12 are mutually covered. The first part 11 and the second part 12 jointly define the containing space 13 for containing the battery monomer 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 or buckled on the open side of the second part 12, so that the first part 11 and the second part 12 jointly define the containing space 13; 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 or buckled on 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.

[0150] In the battery device 100, the battery cells 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 multiple battery cells 20 are accommodated in the box 10 as a whole. Of course, the battery device 100 can also be that the multiple battery cells 20 are 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 and are accommodated in the box 10. The battery device 100 can also include other structures. For example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 20.

[0151] Each battery cell 20 can be a secondary battery or a primary battery, and 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.

[0152] In a first aspect, referring to FIGS. 4 to 20, an embodiment of the present application provides a battery cell 20 including a shell 25, a pole assembly 21, and an elastic electrical connecting piece 22. The pole assembly 21 is arranged on the shell 25, and the pole assembly 21 includes a first pole 23 and a second pole 24. One of the first pole 23 and the second pole 24 is provided with a plug-in part 231, and the other of the first pole 23 and the second pole 24 is provided with a plug-in groove 241 with a size adapted to the plug-in part 231. The plug-in part 231 is configured to be at least partially inserted into the plug-in groove 241 of another battery cell 20 when one battery cell 20 is electrically connected to an adjacent another battery cell 20.

[0153] The elastic electrical connecting piece 22 is arranged on at least one of the plug-in part 231 and the plug-in groove 241, and is configured to elastically abut between the plug-in part 231 of one battery cell 20 and the plug-in groove 241 of another adjacent battery cell 20 when one battery cell 20 is electrically connected to an adjacent another battery cell 20, so as to realize the electrical connection between the two adjacent battery cells 20.

[0154] The battery cell 20 can refer to the smallest unit constituting the battery device 100. The battery cell includes an electrode assembly, and the shell 25 is a component for forming an internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 26, an electrolyte, and other components. The shell 25 can be in various shapes and sizes, such as a cuboid shape, a cylindrical shape, a hexagonal prism shape, 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., and the present application does not specially limit this.

[0155] Optionally, as shown in FIGS. 4-6, in some examples, the shell 25 has a cuboid or flat body shape, and has six surfaces, i.e., front, back, left, right, top, and bottom. In this application, the first direction is the front-back direction, the second direction is the top-bottom direction, and the third direction is the left-right direction. The first pole 23 and the second pole 24 can be arranged on any surface of the shell 25. The first pole 23 and the second pole 24 can be arranged on the same surface or different surfaces of the shell 25.

[0156] Optionally, in one embodiment, the first pole 23 is provided with a plug-in part 231, and the second pole 24 is provided with a plug-in groove 241 with a size matching that of the plug-in part 231. Optionally, in one embodiment, the second pole 24 is provided with a plug-in part 231, and the first pole 23 is provided with a plug-in groove 241 with a size matching that of the plug-in part 231.

[0157] Optionally, as shown in FIG. 20, the rear battery cell includes a plug-in part configured to be at least partially inserted into a plug-in groove of the front battery cell when the rear battery cell is electrically connected to the front battery cell, so as to realize the plug-in of the pole assemblies 21 of the two adjacent battery cells, and thus realize the connection of the first pole 23 and the second pole 24 in a convex-concave complementary manner, cancel the bolt connection or the welding of the two pole assemblies 21 by the gasket, improve the grouping efficiency of the battery device, and improve the maintainability and the step utilization of the battery device after sale.

[0158] Optionally, the first pole 23 and the second pole 24 can be connected in a mortise-tenon plug-in manner, and the size of the plug-in part 231 matches the size of the plug-in groove 241. In this way, the first pole 23 and the second pole 24 are matched more closely, and the connection reliability of the pole assembly 21 is improved to a certain extent.

[0159] Optionally, in one embodiment, the first pole 23 is a positive pole, and the second pole 24 is a negative pole. Optionally, in one embodiment, the first pole 23 is a negative pole, and the second pole 24 is a positive pole. Optionally, as shown in FIGS. 4-6, in some examples, the front battery cell 20 includes the first pole 23 provided with a plug-in part 231. The rear battery cell 20 includes the second pole 24 provided with a plug-in groove 241. In this way, the two battery cells 20 connected in series along the front-back direction through the plug-in part 231 on the first pole 23 and the plug-in groove 241 on the second pole 24.

[0160] Optionally, in one embodiment, the number of the pole assemblies 21 on the same surface can also be two (as shown in FIGS. 9-10) or more than two.

[0161] Optionally, in one embodiment, please refer to FIG. 29, the elastic electrical connecting member 22 is arranged outside the insertion part 231. Optionally, please refer to FIG. 15 to FIG. 28, in one embodiment, the elastic electrical connecting member 22 is arranged inside the insertion groove 241. Optionally, in one embodiment, the elastic electrical connecting member 22 is arranged outside the insertion part 231 and inside the insertion groove 241.

[0162] The elastic electrical connecting member 22 is configured to elastically abut between the insertion part 231 of one battery monomer 20 and the insertion groove 241 of another adjacent battery monomer 20 when the one battery monomer 20 is electrically connected with the another adjacent battery monomer 20, so as to realize the electrical connection between the two adjacent battery monomers 20. Thus, the elastic electrical connecting member 22 can realize the electrical connection between the two battery monomers 20, and can keep the two pole post assemblies 21 in sufficient contact under static and dynamic conditions such as vibration impact, so as to increase the electrical contact area between the two adjacent battery monomers 20 to a certain extent, reduce the overcurrent impedance and heat generation, improve the electrical connection reliability between the two adjacent battery monomers 20, and reduce or avoid safety problems. The elastic electrical connecting member 22 includes but is not limited to an elastic spring sheet.

[0163] For the convenience of description, the first pole post 23 is taken as an example to form the insertion part 231, and the second pole post 24 is taken as an example to form the insertion groove 241.

[0164] Optionally, please refer to FIG. 17 to FIG. 28, the elastic electrical connecting member 22 can be arranged inside the insertion groove 241 and connected to the surface of the second pole post 24 facing the insertion groove 241.

[0165] Optionally, please refer to FIG. 29, in one embodiment, the elastic electrical connecting member 22 can be arranged outside the insertion part 231.

[0166] Optionally, please refer to FIG. 17 to FIG. 28, in one embodiment, the first pole post 23 is provided with the insertion part 231, and the second pole post 24 is provided with the insertion groove 241. The insertion part 231 can be in contact with the surface of the second pole post 24 facing inside the insertion groove 241, so as to increase the connection area of the two pole post assemblies 21. Optionally, please refer to FIG. 13 to FIG. 16, the first pole post 23 includes a first base 232, and the insertion part 231 is arranged on the first base 232. The second pole post 24 includes a second base 242 and a matching part 243, and the matching part 243 is arranged on the second base 242. The matching part 243 is provided with the insertion groove 241.

[0167] According to some embodiments of the present application, optionally, the shell 25 has two first side walls 251 opposite to each other. The area of the first side wall 251 is greater than that of other side walls. The two first side walls 251 are arranged opposite to each other along a first direction. The first pole post 23 and the second pole post 24 are arranged on the first side wall 251 or on the same first side wall 251.

[0168] Optionally, as shown in FIGS. 4-6, in some examples, the shell 25 has a cuboid or flat body shape, the shell 25 has front, rear, left, right, top and bottom surfaces, the first direction is the front-rear direction, and the first side wall 251 forms the front and rear surfaces of the shell 25. The areas of the front and rear first side walls 251 are substantially the same, and are greater than the surface area of the shell 25 on any of the left, right, top, or bottom sides.

[0169] Optionally, as shown in FIGS. 4-6, in some examples, the first side wall 251 in front is provided with a pole assembly 21, and the pole assembly 21 on the first side wall 251 in front can be a positive pole or a negative pole. The first side wall 251 in back is provided with a pole assembly 21, and the pole assembly 21 can be a positive pole or a negative pole and has a polarity opposite to that of the pole assembly 21 on the first side wall 251 in front. Thus, two battery monomers 20 connected by the pole assembly 21 in the front-rear direction can be connected in series.

[0170] Optionally, a first pole 23 can be provided on the first side wall 251 in front, and a second pole 24 can be provided on the first side wall 251 in back.

[0171] Optionally, in an embodiment, the number of pole assemblies 21 on the same first side wall 251 can also be two (as shown in FIGS. 9-11) or more.

[0172] Optionally, in an embodiment, as shown in FIG. 11, the first direction is the front-rear direction, and the first pole 23 and the second pole 24 are respectively provided on the two first side walls 251 opposite to each other. Two first poles 23 are provided on the first side wall 251 in front, and two second poles are provided on the first side wall 251 in back. The two first poles 23 in front are negative poles or positive poles (negative poles in FIG. 11), and the two second poles 24 in back are positive poles or negative poles (positive poles in FIG. 11). Thus, two battery monomers 20 connected by the pole assembly 21 in the front-rear direction are connected in series.

[0173] Optionally, in an embodiment, as shown in FIG. 12, the first direction is the front-rear direction, and the first pole 23 and the second pole 24 are respectively provided on the two first side walls 251 opposite to each other. Two first poles 23 are provided on the first side wall 251 in front, and two second poles are provided on the first side wall 251 in back. One of the two first poles 23 in front is a negative pole, and the other is a positive pole. One of the two second poles in back is a positive pole, and the other is a negative pole. Thus, two battery monomers 20 connected by the pole assembly 21 in the front-rear direction are connected in parallel.

[0174] When connected in parallel, the negative pole of the preceding battery cell 20 on the first side wall 251 facing the rear can be connected to the negative pole of the following battery cell 20 on the first side wall 251 facing the front, and the positive pole of the preceding battery cell 20 on the first side wall 251 facing the rear can be connected to the positive pole of the following battery cell 20 on the first side wall 251 facing the front.

[0175] Optionally, in an embodiment, the first pole 23 and the second pole 24 are arranged on the same first side wall 251.

[0176] In the above embodiment, by arranging the pole assembly 21 on the first side wall 251 with the largest area, the area of the pole assembly 21 can be increased, thereby increasing the overcurrent area of the electrical connection of the battery cell 20 and ensuring the fast charging performance. At the same time, since the battery cell 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.

[0177] According to some embodiments of the present application, optionally, the first pole 23 is provided with an insertion part 231 protruding from the first side wall 251 where the first pole 23 is arranged, and the insertion groove 241 is recessed in the first side wall 251 where the second pole 24 is arranged.

[0178] Specifically, in combination with FIGS. 13-16, the first pole 23 and the second pole 24 are connected in a mortise and tenon type insertion manner, and the size of the insertion part 231 is matched with the size of the insertion groove 241. Thus, the first pole 23 and the second pole 24 are matched more closely, which improves the connection reliability of the pole assembly 21 to some extent.

[0179] It should be noted that in this embodiment, the insertion part 231 protrudes from the first side wall 251 where the first pole 23 is arranged, and the first base 232 of the first pole 23 can protrude relative to the first side wall 251 or be recessed into the housing 25 relative to the first side wall 251.

[0180] The two battery cells 20 arranged in the first direction can be connected by inserting the insertion part 231 of one battery cell 20 into the insertion groove 241 of the other battery cell 20, thereby efficiently connecting the two battery cells 20, and thereby improving the grouping efficiency of the battery device 100 to some extent.

[0181] In the above embodiment, the insertion part 231 protrudes from the first side wall 251 where the first pole 23 is located, and the insertion groove 241 is recessed in the first side wall 251 where the second pole 24 is located. The two battery monomers 20 are electrically connected by inserting the insertion part 231 into the insertion groove 241. The part of the first pole 23 protruding from the first side wall 251 can extend into the first side wall 251 of the other battery monomer 20, so that the distance between the battery monomers 20 in the first direction is shortened, space is saved, and the energy density is improved.

[0182] According to some embodiments of the present application, optionally, the first pole 23 is provided with an insertion part 231 protruding 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 is provided with an insertion groove 241 recessed towards the first side wall 251 from the end of the second pole 24. The depth of the recess of the insertion groove 241 is less than or equal to the height of the second pole 24 protruding from the first side wall 251.

[0183] Optionally, please refer to FIG. 20, the insertion part 231 can be in contact with the surface of the second pole 24 facing the insertion groove 241, so as to increase the connection area of the two pole assemblies 21. Optionally, please refer to FIGS. 13-16, the first pole 23 comprises a first base 232, and the insertion part 231 is arranged on the first base 232. The second pole 24 comprises a second base 242 and a matching part 243, and the matching part 243 is arranged on the second base 242. The matching part 243 is provided with the insertion groove 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 from the first side wall 251 or recess into the housing 25 relative to the first side wall 251. The first base 232 can also be partially or entirely embedded in the first side wall 251.

[0184] In the above embodiment, the insertion part 231 protrudes from the first side wall 251 where the first pole 23 is located, and the insertion groove 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 the adjacent two battery monomers 20 are electrically connected by inserting the insertion part 231 into the insertion groove 241, so as to efficiently connect the two battery monomers 20 and improve the grouping efficiency of the battery device 100 to some extent.

[0185] According to some embodiments of the present application, optionally, the first pole 23 of one battery monomer 20 is directly opposite the second pole 24 of another battery monomer 20 adjacent in the first direction. The battery monomer 20 is configured to insert at least part of the insertion part 231 into the insertion groove 241 of the other battery monomer 20 adjacent in the first direction.

[0186] Specifically, referring to FIGS. 17-20, the first and second pole posts 23 and 24 can be linearly extended along the first direction, protruding from or recessed relative to the first side wall 251. The first and second pole posts 23 and 24 of two battery cells 20 adjacent along the first direction are arranged to be opposite along the first direction, and a pair of first and second electrodes of the two battery cells 20 are inserted relative to each other along the first direction.

[0187] In the above embodiment, the first pole post 23 of one battery cell 20 is opposite along the first direction to the second pole post 24 of another battery cell 20 adjacent along the first direction, and the insertion portion 231 of the first pole post 23 is partially or completely inserted into the insertion slot 241 of the second pole post 24 of the another battery cell 20, so that the two adjacent battery cells 20 are inserted relative to each other along the first direction by the first and second pole posts 23 and 24, and a stable and reliable electrical connection is achieved.

[0188] According to some embodiments of the present application, referring to FIGS. 4, 7 and 8, the battery cell 20 includes an electrode assembly 26 arranged in the housing 25, the electrode assembly 26 includes a main body portion 261 and a tab portion 262 connected to an end of the main body portion 261, the first side wall 251 includes a first region 2511 covering the main body portion 261 and a second region 2512 covering the tab portion 262, the second region 2512 is close to an edge of the first side wall 251, and the first and second pole posts 23 and 24 are arranged in the second region 2512 and electrically connected to the tab portion 262.

[0189] 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 housing 25. The electrode assembly 26 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually arranged between the positive and negative electrode sheets. The positive and negative electrode sheets have portions with active materials constituting the main body portion 261 of the electrode assembly 26, and portions without active materials each constituting a tab portion 262. The positive and negative tab portions 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 portions 262 are connected to the pole post assembly 21 to form a current loop.

[0190] 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.

[0191] In the above embodiment, the first region 2511 covers the body part 261, and the second region 2512 covers the tab part 262. During use of the battery cell 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.

[0192] According to some embodiments of the present application, and as shown in FIGS. 4-8, the body part 261 includes a winding or laminated pole piece, the pole piece is coated with an active material layer (not shown) 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.

[0193] Specifically, the active material layer is coated on the pole piece and spaced a small distance from the tab part 262 at the edge of the pole piece where the tab part 262 is formed. 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.

[0194] In the above embodiment, the region of the pole piece coated with the active material layer is directly opposite the first region 2511 in the first direction, which minimizes the influence of the expansion and deformation of the pole piece on the stability of the insertion of the pole column assembly 21.

[0195] According to some embodiments of the present application, as shown in FIGS. 5-8, the first side wall 251 is square-shaped, and has two opposite short sides 2513 along a second direction (e.g., the up-down direction as shown in the figures) and two opposite long sides 2514 along a third direction, the length of the short side 2513 being less than that of the long side 2514, the second direction, the third direction and the first direction being perpendicular to each other, and the second area 2512 being arranged close to one of the short side 2513 and the long side 2514, the first pole 23 and the second pole 24 extending along the length direction of the short side 2513 or the long side 2514 close to the second area 2512 and being strip-shaped.

[0196] Optionally, as shown in FIGS. 5 and 7, in one example, the first direction is the direction perpendicular to the paper in FIG. 7, the shell 25 is flat cuboid-shaped, 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 rectangular-shaped, 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 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.

[0197] Optionally, as shown in FIGS. 6 and 8, in one example, the first direction is the direction perpendicular to the paper in FIG. 8, the shell 25 is cuboid-shaped, 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 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.

[0198] The embedded mortise-and-tenon connection of the pole assembly 21 in the first direction (e.g., the front-rear direction as shown in the figures) improves the space utilization in the up-down direction.

[0199] In the above embodiments, the pole assembly 21 extends along the length direction of the close short side 2513 or long side 2514 and is strip-shaped, which is beneficial to dispersing stress in the length direction of the edge of the first side wall 251 and improving the structural stability of the pole assembly 21.

[0200] According to some embodiments of the present application, as shown in FIGS. 4-6, the battery cell 20 includes a pressure relief mechanism 254 disposed on the surface of the shell 25 other than the first side wall 251, and the pressure relief mechanism 254 is configured to rupture before the shell 25 when the internal pressure of the battery cell 20 exceeds a pressure threshold.

[0201] 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 other than the first side wall 251 by means of a notch, groove, or the like. As shown in FIG. 4, the pressure relief mechanism 254 is disposed on the cover 253 of the battery cell 20.

[0202] Optionally, the first side wall 251 is located on the front and back sides of the battery cell 20, and the pressure relief mechanism 254 can be disposed on one of the left, right, top, and bottom sides of the shell 25.

[0203] In the above embodiments, the pressure relief mechanism 254 is disposed on the surface of the shell 25 other than the first side wall 251, and the pressure relief mechanism 254 ruptures before the other walls of the shell 25 when the internal pressure of the battery cell 20 exceeds the threshold, thereby releasing the internal pressure and avoiding the risk of the first side wall 251 cracking when the internal pressure of the battery cell 20 is too high, reducing the impact of the internal pressure of the battery cell 20 being too high on the pole assembly 21, and further reducing the safety risk.

[0204] According to some embodiments of the present application, the shell 25 is provided with a mounting hole, and the pole assembly 21 is entirely covered outside the mounting hole;

[0205] Alternatively, part of the pole assembly 21 is covered outside the mounting hole, and part of the pole assembly 21 extends into the shell 25 through the mounting hole and cooperates with the shell 25.

[0206] 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 has a long strip runway shape, and the mounting hole (not shown) also has a long strip runway shape 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.

[0207] When part of the pole assembly 21 is covered outside the mounting hole (not shown), the part of the pole assembly 21 extending into the mounting hole (not shown) can be buckled with the shell 25 and connected with the electrode assembly 26.

[0208] The pole assembly 21 is entirely covered outside the mounting hole (not shown in the figure), which facilitates the assembly of the pole assembly 21 and the shell 25, simplifies the manufacturing process, improves the reliability and stability of the connection between the pole assembly 21 and the shell 25, and prevents the pole assembly 21 from being separated from the shell 25 or being cracked or damaged due to vibration or external pulling after the pole assembly 21 is combined with the shell 25 during the charging and discharging process of the battery monomer 20.

[0209] Part of the pole assembly 21 is covered outside the mounting hole (not shown in the figure) and extends into the shell 25 through the mounting hole (not shown in the figure) to be combined with the shell 25, which is beneficial to improve the stability of the electrical connection between the pole assembly 21 and the electrode assembly 26 in the shell 25 and the overcurrent capacity.

[0210] According to some embodiments of the present application, as shown in FIG. 4, the shell 25 includes a shell body 252 and a cover 253, the shell body 252 has an opening 2521, and the cover 253 is sealed to cover the opening 2521; the pole assembly 21 is arranged on any one of the shell body 252 and the cover 253.

[0211] Specifically, the cover 253 can be combined with 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. Optionally, 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 and 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 on any one of the shell body 252 and the cover 253, and the pole assembly 21 is electrically connected to the electrode assembly 26 for outputting or inputting the electrical 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., which is not specially limited in the embodiments of the present application. In some embodiments, an insulating member can also be arranged on the inner side of the cover 253, which can be used to isolate the electrical connection components in the shell body 252 from the cover 253 to reduce the risk of short circuit. Exemplarily, the insulating member 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 body 253 can be independent components, and the shell body 252 can be provided with an opening 2521. The cover body 253 is used to cover the opening 2521 to form an internal environment of the battery monomer 20. Alternatively, the cover body 253 and the shell body 252 can be integrated. Specifically, the cover body 253 and the shell body 252 can form a common connecting surface before other components enter the shell. When it is necessary to seal the internal environment of the shell body 252, the cover body 253 is used to cover the shell body 252.

[0215] In the above embodiment, the shell body 252 has the opening 2521, and the cover body 253 seals the opening 2521. The pole assembly 21 is arranged in any one of the shell body 252 and the cover body 253, which facilitates the assembly production of the shell 25 and the electrode assembly 26.

[0216] According to some embodiments of the present application, the elastic electrical connecting piece 22 extends along the length extension direction of the corresponding first pole 23 or second pole 24.

[0217] In the above embodiment, the elastic electrical connecting piece 22 extends along the length extension direction of the corresponding first pole 23 or second pole 24, so that the part of the elastic electrical connecting piece 22 abutting against the first pole 23 or second pole 24 is uniformly distributed along the length extension direction of the corresponding first pole 23 or second pole 24, avoiding that the elastic electrical connecting piece 22 is stably connected with the first pole 23 or second pole 24 in a local part and unstably connected with the first pole 23 or second pole 24 in a local part, which leads to a higher creeping potential in the local part.

[0218] Specifically, the elastic electrical connecting piece 22 can be in a strip shape, and the elastic electrical connecting piece 22 is distributed along the length extension direction of the corresponding first pole 23 or second pole 24. In one embodiment, please refer to FIG. 3 and FIG. 24, the elastic electrical connecting piece 22 is distributed in a strip shape along the length extension direction of the corresponding second pole 24, and the length extension direction of the second pole 24 is the up-down direction shown in FIG. 3. The second pole 24 is provided with a plug-in slot 241, and the elastic electrical connecting piece 22 is arranged in the plug-in slot 241 and fixedly connected with the second pole 24 at one end.

[0219] In one embodiment, please refer to FIG. 3 and FIG. 29, the elastic electrical connecting piece 22 is distributed along the length extension direction of the corresponding first pole 23, and the length extension direction of the first pole 23 is the up-down direction shown in FIG. 3. The first pole 23 is provided with a plug-in part 231, and the elastic electrical connecting piece 22 is arranged outside the plug-in part 231 and fixedly connected with the first pole 23 at one end.

[0220] According to some embodiments of the present application, optionally, the elastic electrical connecting piece 22 comprises a plurality of elastic connecting portions 224, which are arranged at intervals along the length extension direction of the corresponding first pole 23 or second pole 24.

[0221] In the above embodiment, the plurality of elastic connecting portions 224 are arranged at intervals along the length extension direction of the corresponding first pole 23 or second pole 24, so as to improve the stability of the abutment between the elastic electrical connecting piece 22 and the first pole 23 or second pole 24 to a certain extent.

[0222] Specifically, in one embodiment, please refer to FIG. 3, FIG. 15 and FIG. 24, each elastic connecting portion 224 is arranged in a strip shape along the length extension direction of the corresponding second pole 24, and the length extension direction of the second pole 24 is the up-down direction shown in FIG. 3. The second pole 24 is provided with a plug-in slot 241, and each elastic connecting portion 224 is arranged in the plug-in slot 241 and fixedly connected to the second pole 24 at one end. Please refer to FIG. 15 and FIG. 24, the right surface and the left surface of the second pole 24 towards the plug-in slot 241 are respectively provided with a plurality of elastic connecting portions 224, and the plurality of elastic connecting portions 224 in the left-right direction can abut the plug-in portion 231 in the left-right direction with uniform stress, so as to improve the stability of the abutment between the elastic electrical connecting piece 22 and the first pole 23 to a certain extent.

[0223] In one embodiment, please refer to FIG. 3 and FIG. 29, the elastic electrical connecting piece 22 is arranged along the length extension direction of the corresponding first pole 23, and the length extension direction of the first pole 23 is the up-down direction shown in FIG. 3. The first pole 23 is provided with a plug-in portion 231, and the elastic electrical connecting piece 22 is arranged outside the plug-in portion 231 and fixedly connected to the first pole 23 at one end. In FIG. 29, the right surface and the left surface of the plug-in portion 231 are respectively provided with a plurality of elastic connecting portions 224, and when the plug-in portion 231 is inserted into the plug-in slot 241, the plurality of elastic connecting portions 224 in the left-right direction can abut the second pole 24 in the left-right direction with uniform stress, so as to improve the stability of the abutment between the elastic electrical connecting piece 22 and the second pole 24 to a certain extent.

[0224] According to some embodiments of the present application, optionally, the elastic electrical connecting piece 22 comprises one elastic connecting portion 224, which is arranged continuously along the length extension direction.

[0225] In the above embodiment, the one elastic connecting portion 224 is arranged at intervals along the length extension direction of the corresponding first pole 23 or second pole 24, so as to improve the stability of the abutment between the elastic electrical connecting piece 22 and the first pole 23 or second pole 24 to a certain extent.

[0226] Specifically, in one embodiment, the elastic connecting portion 224 is arranged in a long annular shape along the length extension direction of the corresponding second pole column 24, and the length extension direction of the second pole column 24 is the up-down direction shown in FIG. 3. The second pole column 24 is provided with a plug-in groove 241, and the elastic connecting portion 224 is arranged in the plug-in groove 241 and fixedly connected to the second pole column 24 at one end. The elastic connecting portion 224 is arranged in the plug-in groove 241, so that when the plug-in portion 231 is inserted into the plug-in groove 241, the elastic connecting portion 224 can be in force uniform abutment with the plug-in portion 231 in the circumferential direction of the plug-in portion 231, thereby improving the stability of the abutment between the elastic electrical connecting piece 22 and the first pole column 23 to a certain extent.

[0227] In one embodiment, the elastic connecting portion 224 is arranged in a long annular shape along the length extension direction of the corresponding first pole column 23, and the length extension direction of the first pole column 23 is the up-down direction shown in FIG. 3. The first pole column 23 is provided with a plug-in portion 231, and the elastic connecting portion 224 is arranged outside the plug-in portion 231 and fixedly connected to the plug-in portion 231 at one end. When the plug-in portion 231 is inserted into the plug-in groove 241, the elastic connecting portion 224 can be in force uniform abutment with the second pole column 24 in the circumferential direction of the plug-in portion 231, thereby improving the stability of the abutment between the elastic electrical connecting piece 22 and the second pole column 24 to a certain extent.

[0228] According to some embodiments of the present application, optionally, the elastic connecting portion 224 includes a plurality of connecting portions, and the plurality of connecting portions are arranged in the plug-in direction of the first pole column 23 and the second pole column 24.

[0229] In the above embodiment, the plurality of connecting portions are arranged in the plug-in direction of the first pole column 23 and the second pole column 24, and the first pole column 23 and the second pole column 24 can be electrically connected by the plurality of elastic connecting portions 224, thereby improving the electrical contact area of the adjacent two battery monomers to a certain extent, reducing the overcurrent impedance and heat generation, improving the electrical connection reliability of the adjacent two battery monomers, and reducing or avoiding safety problems.

[0230] Optionally, in one embodiment, please refer to FIG. 15 and FIG. 24, the elastic electrical connecting piece 22 is arranged in the plug-in groove 241, the plurality of connecting portions are arranged in the plug-in direction of the first pole column 23 and the second pole column 24, and the plurality of elastic connecting portions are arranged on the left surface and the right surface of the second pole column 24 facing the plug-in groove 241 in the plug-in direction of the first pole column 23 and the second pole column 24.

[0231] Optionally, in one embodiment, please refer to FIG. 29, the elastic electrical connecting piece 22 is arranged outside the plug-in portion 231, the plurality of connecting portions are arranged in the plug-in direction of the first pole column 23 and the second pole column 24, and the plurality of elastic connecting portions are arranged on the left surface and the right surface of the plug-in portion 231 in the plug-in direction of the first pole column 23 and the second pole column 24.

[0232] According to some embodiments of the present application, the elastic connecting part 224 comprises two connecting parts, i.e., a first connecting part 225 and a second connecting part 226, which are arranged in the direction of insertion of the first pole 23 and the second pole 24.

[0233] In the above embodiment, the elastic connecting part 224 comprises the first connecting part 225 and the second connecting part 226, so that the first pole 23 and the second pole 24 can form two electrically contacting positions through the first connecting part 225 and the second connecting part 226, which is conducive to improving the stability of the contact between the first pole 23 and the second pole 24.

[0234] Specifically, the two electrically contacting positions formed by the first pole 23 and the second pole 24 through the first connecting part 225 and the second connecting part 226 can be arranged in the direction of insertion of the first pole 23 and the second pole 24. Please refer to FIG. 15, the elastic electrical connecting piece 22 is arranged in the insertion slot 241, and the first connecting part 225 is closer to the slot opening of the insertion slot 241 than the second connecting part 226. When the second pole 24 faces the left surface in the insertion slot 241, the first connecting part 225 and the second connecting part 226 form two electrically contacting positions with the first pole 23, respectively. When the second pole 24 faces the right surface in the insertion slot 241, the first connecting part 225 and the second connecting part 226 form two electrically contacting positions with the first pole 23, respectively.

[0235] Please refer to FIG. 29, the elastic electrical connecting piece 22 is arranged outside the insertion part 231, and the first connecting part 225 is closer to the end of the insertion part 231 than the second connecting part 226. On the left side of the insertion part 231, the first connecting part 225 and the second connecting part 226 form two electrically contacting positions with the second pole 24, respectively. On the right side of the insertion part 231, the first connecting part 225 and the second connecting part 226 form two electrically contacting positions with the second pole 24, respectively.

[0236] According to some embodiments of the present application, the first pole 23 or the second pole 24 provided with the elastic connecting part 224 is provided with the application release slot 211 at a position between any two adjacent connecting parts in the direction of insertion of the first pole 23 and the second pole 24. When the first pole 23 and the second pole 24 are inserted and matched, the elastic electrical connecting piece 22 is deformed and can partially extend into the application release slot 211.

[0237] In the above embodiment, during the assembly of the first pole 23 and the second pole 24, when the elastic electrical connecting piece 22 is deformed, it can partially extend into the application release slot 211, so that the stress of the elastic electrical connecting piece 22 is released, which to some extent avoids the damage caused by excessive extrusion of the elastic electrical connecting piece 22.

[0238] Optionally, in one embodiment, please refer to FIG. 13 to FIG. 28, the elastic electrical connecting member 22 is arranged in the insertion slot 241, and the second pole 24 is provided with an application release slot 211 at a position between any two adjacent connecting portions. One end of the connecting portion is fixedly connected to the second pole 24, and the other end is movable. When the first pole 23 and the second pole 24 are inserted and matched, the elastic electrical connecting member 22 is deformed, and the movable end can extend into the application release slot 211.

[0239] Optionally, in one embodiment, please refer to FIG. 29, the elastic electrical connecting member 22 is arranged outside the insertion portion 231, and the first pole 23 is provided with an application release slot 211 at a position between any two adjacent connecting portions. One end of the connecting portion is fixedly connected to the insertion portion 231, and the other end is movable. When the first pole 23 and the second pole 24 are inserted and matched, the elastic electrical connecting member 22 is deformed, and the movable end can extend into the application release slot 211.

[0240] The shape of the application release slot 211 includes but is not limited to regular shapes such as rectangle and circle, or irregular shapes.

[0241] According to some embodiments of the present application, among two adjacent connecting portions located on both sides of the same application release slot 211, one connecting portion is connected to the corresponding first pole 23 or second pole 24 at a position adjacent to the application release slot 211, and is movable relative to the first pole 23 or second pole 24 at a position away from the application release slot 211, and the other connecting portion is movable relative to the corresponding first pole 23 or second pole 24 at a position adjacent to the application release slot 211, and is connected to the first pole 23 or second pole 24 at a position away from the application release slot 211.

[0242] In the above embodiment, among two adjacent connecting portions located on both sides of the same application release slot 211, one connecting portion is movable relative to the first pole 23 or second pole 24 at a position away from the application release slot 211, so that when the first pole 23 and the second pole 24 are inserted and matched, the movable position can cause the connecting portion to deform; and the other connecting portion is movable relative to the corresponding first pole 23 or second pole 24 at a position adjacent to the application release slot 211, so that when the first pole 23 and the second pole 24 are inserted and matched, the movable position can extend into the application release slot 211 to release stress.

[0243] In detail, please refer to Fig. 24, the elastic electrical connecting piece 22 is arranged in the insertion groove 241, the connecting part includes a first end 221 and a second end 222, the first end 221 of the second connecting part 226 is connected with the second pole 24, and the second end 222 of the second connecting part 226 is connected with the second pole 24. The second end 222 of the first connecting part 225 is movable relative to the second pole 24, and the second end 222 of the first connecting part 225 is connected with the second pole 24. When the first pole 23 and the second pole 24 are inserted and matched, the second end 222 of the second connecting part 226 can make the second connecting part 226 deformed, and the second end 222 of the first connecting part 225 can extend into the application release groove.

[0244] Optionally, in Fig. 24, the second pole 24 is further provided with an application release groove 211 adjacent to the second end 222 of the second connecting part 226, and the second end 222 of the second connecting part 226 can extend into the application release groove 211.

[0245] Please refer to Fig. 29, the elastic electrical connecting piece 22 is arranged outside the insertion part 231, the connecting part includes a first end 221 and a second end 222, the first end 221 of the second connecting part 226 is connected with the first pole 23, and the second end 222 of the second connecting part 226 is connected with the first pole 23. The second end 222 of the first connecting part 225 is movable relative to the first pole 23, and the second end 222 of the first connecting part 225 is connected with the first pole 23. When the first pole 23 and the second pole 24 are inserted and matched, the second end 222 of the second connecting part 226 can make the second connecting part 226 deformed, and the second end 222 of the first connecting part 225 can extend into the application release groove.

[0246] Optionally, in Fig. 29, the first pole 23 is further provided with an application release groove 211 adjacent to the second end 222 of the second connecting part 226, and the second end 222 of the second connecting part 226 can extend into the application release groove 211.

[0247] According to some embodiments of the present application, optionally, the elastic electrical connecting piece 22 is arranged in the insertion groove 241, and / or the elastic electrical connecting piece 22 is arranged outside the insertion part 231.

[0248] Optionally, please refer to Figs. 13 to 28, in an embodiment, the second pole 24 is provided with the insertion groove 241, and the elastic electrical connecting piece 22 is arranged in the insertion groove 241. Optionally, in an embodiment, the first pole 23 is provided with the insertion groove 241, and the elastic electrical connecting piece 22 is arranged in the insertion groove 241.

[0249] The elastic electrical connecting piece 22 is arranged in the insertion groove 241, and the elastic electrical connecting piece 22 is not easily damaged by external objects during transportation, storage and the like of the battery monomer 20, thereby to a certain extent providing the service life of the elastic electrical connecting piece 22.

[0250] Optionally, in one embodiment, the first pole 23 is provided with an insertion part 231, and the elastic electrical connecting piece 22 is arranged outside the insertion part 231. Optionally, in one embodiment, the second pole 24 is provided with an insertion part 231, and the elastic electrical connecting piece 22 is arranged outside the insertion groove 241.

[0251] The elastic electrical connecting piece 22 is arranged outside the insertion part 231, which can facilitate the maintenance (such as replacement, repair, etc.) of the elastic electrical connecting piece 22.

[0252] Optionally, in one embodiment, one or more elastic electrical connecting pieces 22 are arranged outside the insertion part 231; and another or more elastic electrical connecting pieces 22 are arranged in the insertion groove 241.

[0253] According to some embodiments of the present application, optionally, the battery monomer 20 comprises a containing groove 212 arranged on the first pole 23 or the second pole 24, and the elastic electrical connecting piece 22 comprises an elastic part 223 located in the containing groove 212 and connected with the side wall of the containing groove 212.

[0254] Specifically, the elastic part 223 connects the first end 221 and the second end 222. Optionally, in one embodiment, please refer to FIGS. 13 to 28, the elastic electrical connecting piece 22 is arranged in the insertion groove 241, and the elastic electrical connecting piece 22 is arranged on the surface of the second pole 24 facing the insertion groove 241. The first end 221 of the elastic electrical connecting piece 22 is fixedly connected with the surface of the second pole 24 facing the insertion groove 241, and the second end 222 is movable relative to the connected second pole 24. The containing groove 212 is arranged on the first pole 23, specifically, the containing groove 212 is arranged on the circumferential surface of the insertion part 231, and when the adjacent two battery monomers 20 are electrically connected, the elastic part 223 is located in the containing groove 212 and connected with the side wall of the containing groove 212.

[0255] Optionally, in one embodiment, please refer to FIG. 29, the elastic electrical connecting piece 22 is arranged outside the insertion part 231, one end of the elastic electrical connecting piece 22 is fixedly connected with the insertion part 231, and the second end 222 is movable relative to the connected first pole 23. The containing groove 212 is arranged on the second pole 24, specifically, the containing groove 212 is arranged on the circumferential surface of the second pole 24 facing the insertion groove 241, and when the adjacent two battery monomers 20 are electrically connected, the elastic part 223 is located in the containing groove 212 and connected with the side wall of the containing groove 212.

[0256] Please refer to FIG. 21 to FIG. 28, when the first pole 23 and the second pole 24 are assembled, the elastic electrical connecting piece 22 is extruded and deformed by the first pole 23 and the second pole 24, and the elastic part 223 is flattened. When the first pole 23 and the second pole 24 are assembled in place, the elastic part 223 rebounds into the accommodating groove 212 and is connected with the counterpart, thereby fully contacting the counterpart (the second pole 24 or the insertion part 231).

[0257] According to some embodiments of the present application, optionally, the accommodating groove 212 is extended on the corresponding first pole 23 or second pole 24.

[0258] Optionally, in an embodiment, please refer to FIG. 13 and FIG. 14, the accommodating groove 212 can be extended on the circumferential surface of the insertion part 231 of the first pole 23, so as to be matched with the elastic part 223 arranged on the circumferential surface of the second pole 24 facing the insertion groove 241. Optionally, in an embodiment, please refer to FIG. 29, the accommodating groove 212 can be extended on the circumferential surface of the second pole 24 facing the insertion groove 241, so as to be matched with the elastic part 223 arranged on the circumferential surface of the insertion part 231.

[0259] In the above embodiments, the accommodating groove 212 is extended on the corresponding first pole 23 or second pole 24, so that the accommodating groove 212 can be matched with the position of the elastic part 223, and the elastic part 223 can be fully contacted with the counterpart.

[0260] The shape of the accommodating groove 212 includes but is not limited to regular or irregular shapes such as rectangle, arc, etc. The shape of the accommodating groove 212 can be matched with the shape of the elastic part 223. In FIG. 20 and FIG. 24, the elastic part 223 is basically arc-shaped, and the accommodating groove 212 is basically arc-shaped.

[0261] According to some embodiments of the present application, optionally, the first pole 23 or the second pole 24 includes a pole body 213 and an electrical connecting column 214, the electrical connecting column 214 is connected with the pole body 213, the elastic electrical connecting piece 22 is arranged on the electrical connecting column 214, and the end of the electrical connecting column 214 away from the pole body 213 is configured to be inserted with the second pole 24 or the first pole 23 of another adjacent battery monomer 20.

[0262] Specifically, for the convenience of description and in combination with FIG. 30 to FIG. 33, the present embodiment and subsequent embodiments take the first pole 23 including the pole body 213 and the electrical connecting column 214 as an example for description.

[0263] The elastic electrical connecting piece 22 can abut against the electrical connecting column 214 and the second pole column 24, so that the first pole column 23 and the second pole column 24 of the two adjacent battery monomers 20 are electrically connected. The electrical connecting column 214 is matched with the pole column body 213 in shape and size. For example, the pole column body 213 is in a strip shape, and the electrical connecting column 214 is in a strip column structure matched with the pole column body 213 in size.

[0264] Optionally, the electrical connecting column 214 can also be a thick and short column or other composite structure. Optionally, the electrical connecting column 214 can be in a cylindrical shape, a prism shape or other shapes, which are not limited in the application.

[0265] Optionally, the electrical connecting column 214 and the pole column body 213 are in a split structure. Optionally, as shown in FIGS. 32 and 33, both ends of the electrical connecting column 214 are formed with the plug-in slots 241. Optionally, as shown in FIGS. 30 and 31, both ends of the electrical connecting column 214 are formed with the plug-in parts 231. Optionally, one end of the electrical connecting column 214 is formed with the plug-in slot 241, and the other end is formed with the plug-in part 231. The second pole column 24 is formed with the plug-in slot 241 matched with the plug-in part 231 of the electrical connecting column 214, as shown in FIGS. 30 and 31, or the plug-in part 231 matched with the plug-in slot 241 of the electrical connecting column 214, as shown in FIGS. 32 and 33.

[0266] Optionally, the pole column body 213 of the two battery monomers 20 adjacent in the first direction is arranged opposite to the second pole column 24 in the first direction. The plurality of battery monomers 20 are sequentially connected in the first direction through the plurality of electrical connecting columns 214 and the second pole column 24.

[0267] In the above embodiment, the end of the electrical connecting column 214 away from the pole column body 213 is configured to be plugged with the second pole column 24 of another adjacent battery monomer 20, so as to realize the electrical connection of the two battery monomers 20, which replaces the connection mode of welding the pole column of the battery monomer 20 with the gasket of the adjacent battery monomer 20 to realize the electrical connection of the battery monomer 20, thereby improving the defects such as virtual welding and burst hole caused by welding the pole column with the gasket, and improving the reliability of the electrical connection between the battery monomers 20. On the other hand, the pole column body 213 and the second pole column 24 of the adjacent battery monomers 20 are connected through the electrical connecting column 214, which not only can unify the shape of each pole column body 213 to ensure the manufacturing efficiency of the pole column body 213, but also can adjust the distance between the adjacent battery monomers 20 through the intermediate electrical connecting column 214 to adapt to the expansion of the battery monomers 20, thereby further improving the reliability of the electrical connection between the battery monomers 20.

[0268] According to some embodiments of the present application, optionally, the pole body 213 and the second pole 24 are both formed with a plug-in slot 241; the two ends of the electric connection column 214 are respectively formed with a plug-in part 231, one of the two plug-in parts 231 is plugged with the plug-in slot 241 of the pole body 213, and the other of the two plug-in parts 231 is plugged with the plug-in slot 241 of the second pole 24 of the adjacent battery monomer 20.

[0269] Optionally, the pole body 213 can form the plug-in slot 241 with a cross-section in a circular, elliptical, triangular, square, polygonal, racetrack or other regular or irregular shape. Optionally, the cross-sectional shape of the plug-in part 231 is circular, elliptical, triangular, square, polygonal, racetrack or other regular or irregular shape which is adapted to the plug-in slot 241.

[0270] Optionally, the pole body 213 extends along the length direction of the battery monomer 20 to form a long strip shape, and the length direction of the battery monomer 20 can be the left-right direction shown in FIG. 3. The electric connection column 214 is a column with a length close to that of the pole body 213. Further, the plug-in slot 241 and the plug-in part 231 both extend along the length direction of the pole body 213 to form a long strip shape. Such a setting increases the connection area, which is particularly beneficial to dispersing stress in the length direction of the side edge of the battery monomer 20 and ensuring the structural stability of the connection between the pole body 213 and the electric connection column 214.

[0271] Optionally, please refer to FIG. 30, the plug-in slot 241 includes a slot bottom surface 2411 and a slot inner circumferential surface 2412, the slot bottom surface 2411 is the deepest part of the plug-in slot 241 in the recess direction, and the slot inner circumferential surface 2412 can connect the slot bottom surface 2411 and the surface of the battery monomer 20 or the end surface of the pole assembly 21. Further, the plug-in slot 241 is recessed along the direction of the first direction shell 25, and the slot inner circumferential surface 2412 surrounds the plug-in part 231 along the up-down direction and the left-right direction.

[0272] Optionally, the plug-in part 231 is a protruding structure which is adapted to the plug-in slot 241. The plug-in part 231 is inserted into the plug-in slot 241, the top end of the plug-in part 231 in the first direction is accommodated in the plug-in slot 241, and the end surface of the plug-in part 231 can abut against the slot bottom surface 2411. On the one hand, the elastic electric connection piece 22 can abut against the circumferential wall of the plug-in part 231 and the slot inner circumferential surface 2412 of the second pole 24 to electrically connect the first pole 23 and the second pole 24. On the other hand, the elastic electric connection piece 22 can abut against the circumferential wall of the plug-in part 231 and the slot inner circumferential surface 2412 of the pole body 213 to electrically connect the pole body 213 and the electric connection column 214.

[0273] In the embodiments of the present application, the electrical connection between the pole body 213, the electrical connection column 214 and the second pole 24 is achieved by inserting the plug-in part 231 into the plug-in slot 241, which is relatively simple to operate and stable in connection. Meanwhile, the two battery monomers 20 that have completed the electrical connection can be exempted from welding, thereby avoiding the problem that the electrode assembly 26 is easily damaged when the pole assembly 21 is disassembled from the welding position.

[0274] According to some embodiments of the present application, as shown in FIG. 30, the pole body 213 and the second pole 24 both protrude from the side wall of the shell 25, and the protruding parts of the pole body 213 and the second pole 24 are recessed towards the side wall of the shell 25 to form the plug-in slot 241, respectively. Alternatively, as shown in FIG. 31, the pole body 213 and the second pole 24 are both recessed towards the side wall of the shell 25 to directly form the plug-in slot 241.

[0275] Alternatively, as shown in FIG. 30, in an embodiment, the plug-in slot 241 of the pole body 213 is recessed towards the shell 25 at the end face of the pole body 213 away from the shell 25, and the plug-in slot 241 of the second pole 24 is recessed towards the shell 25 at the end face of the second pole 24 away from the shell 25.

[0276] As shown in FIG. 4, the pole body 213 and the second pole 24 both protrude from the first side wall 251 of the shell 25. For the convenience of description, the inner side and the outer side of the battery monomer 20 are distinguished by the first side wall 251 where the pole body 213 and the second pole 24 are located. In the same battery monomer 20, the interval opposite to the two first side walls 251 is located on the inner side of the battery monomer 20, and the interval away from the two first side walls 251 is located on the outer side of the battery monomer 20.

[0277] Alternatively, in an example, the pole body 213 and the second pole 24 both protrude from the first side wall 251 where they are located, and the pole body 213 and the second pole 24 are both at least partially located on the outer side of the battery monomer 20. The bottom surface 2411 of the plug-in slot 241 can be located on the inner side of the battery monomer 20, and the inner circumferential surface 2412 of the plug-in slot 241 is partially located on the inner side of the battery monomer 20 and partially located on the outer side of the battery monomer 20. The bottom surface 2411 of the plug-in slot 241 can also be located on the outer side of the battery monomer 20, and the inner circumferential surface 2412 of the plug-in slot 241 is entirely located on the outer side of the battery monomer 20, as shown in FIG. 30.

[0278] In the above embodiment, the pole body 213 and the second pole 24 are both protruded from the side wall (such as the first side wall 251) of the shell 25 in which they are located, so as to reduce the damage of the pole assembly 21 to the electrode assembly 26 and other structures inside the battery cell 20. In addition, the first pole 23 and the second pole 24 are separately formed from the battery cell 20, which facilitates the molding and assembly.

[0279] Alternatively, in another example, please refer to FIG. 31, the pole body 213 and the second pole 24 are both recessed inwardly relative to the side wall of the shell 25 in which they are located, so as to directly form the insertion slot 241, and the bottom surface 2411 and the inner circumferential surface 2412 of the insertion slot 241 are both located inside the battery cell 20.

[0280] In the above embodiment, the pole body 213 and the second pole 24 are both recessed inwardly from the side wall (such as the first side wall 251) of the shell 25 in which they are located to form the insertion slot 241, so that the electric connection column 214 is directly inserted into the inside of the surface of the battery cell 20, the pole assembly 21 is not easy to be deformed under the conditions of collision, extrusion, pulling and the like, and the insertion structure of the insertion slot 241 and the electric connection column 214 is relatively stable.

[0281] According to some embodiments of the present application, optionally, please refer to FIG. 32 and FIG. 33, the pole body 213 and the second pole 24 are both provided with the insertion part 231, and the two ends of the electric connection column 214 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 213, 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.

[0282] The elastic electric connection piece 22 can abut against the circumferential wall of the insertion part 231 of the second pole 24 and the inner circumferential surface 2412 of the electric connection column 214, so as to electrically connect the first pole 23 and the second pole 24. On the other hand, the elastic electric connection piece 22 can abut against the circumferential wall of the insertion part 231 of the pole body 213 and the inner circumferential surface 2412 of the electric connection column 214, so as to electrically connect the pole body 213 and the electric connection column 214.

[0283] Optionally, the pole body 213 is provided with a first base 232, the second pole 24 is provided with a second base 242, the insertion part 231 on the pole body 213 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 slot 241 is a groove matched with the insertion part 231, and the insertion slot 241 is recessed inwardly from the end surface of the electric connection column 214. The top end of the protruded insertion part 231 is accommodated in the insertion slot 241, and the end surface thereof can abut against the bottom wall of the recessed insertion slot 241. Optionally, the first direction is the front-rear direction, the insertion part 231 is protruded along the first direction, and the insertion slot 241 is recessed along the first direction.

[0284] Optionally, the electric connecting column 214 is a long prism structure, the insertion slot 241 extends along the length direction of the electric connecting column 214 to be a long square slot, and the insertion part 231 forms a long protrusion matching the size of the insertion slot 241.

[0285] In the above embodiment, the electric connection between the pole column body 213, the electric connecting column 214 and the second pole column 24 is realized by inserting the insertion part 231 into the insertion slot 241, which is relatively simple to operate and stable in connection. Meanwhile, the two battery monomers 20 that have completed the electric connection can be exempted from welding, thereby avoiding the problem that the electrode assembly 26 is easily damaged when the pole assembly 21 is disassembled at the welding position.

[0286] According to some embodiments of the present application, the pole column body 213 and the second pole column 24 are both protruded from the side wall of the shell 25 where they are located to directly form the insertion part 231, as shown in FIG. 32; or the pole column body 213 and the second pole column 24 are both recessed from the side wall of the shell 25 where they are located, and the insertion part 231 is protruded at the recessed position and smaller than the recessed size, as shown in FIG. 33.

[0287] As shown in FIG. 4, the pole column body 213 and the second pole column 24 are both protruded from the first side wall 251 of the shell 25 where they are located.

[0288] In one example, the pole column body 213 and the second pole column 24 are both protruded from the first side wall 251 of the shell 25 where they are located to the outside of the battery monomer 20, the part protruded from the first side wall 251 forms the insertion part 231, and the insertion part 231 is located at the outside of the battery monomer 20, as shown in FIG. 32.

[0289] In the embodiments of the present application, the pole column body 213 and the second pole column 24 are protruded from the first side wall 251 of the shell 25 where they are 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.

[0290] In another example, referring to FIG. 33, the pole body 213 and the second pole 24 are recessed from the first side wall 251 where each of them is located to the inside of the shell 25, and the bottom wall of the pole body 213 and the second pole 24 after being recessed is protruded to form a plug-in part 231 away from the shell 25. The protrusion depth of the plug-in part 231 is less than or equal to the recess depth of the pole body 213 and the second pole 24, and the plug-in part 231 is located inside the battery monomer 20 and arranged in the recessed area formed by the pole body 213 and the second pole 24. The electric connection column 214 can be partially inserted into the recessed area of the pole body 213 and the second pole 24 and plugged with the plug-in part 231 inside the battery monomer 20 to accommodate the plug-in part 231 in the plug-in slot 241.

[0291] In the above embodiment, the pole body 213 and the second pole 24 are recessed from the side wall of the shell where each of them is located to the inside of the shell 25, so that the electric connection column 214 is directly inserted into the inside of the surface of the battery monomer 20, and the plug-in part 231 and the plug-in slot 241 are plugged inside the surface of the battery monomer 20, thereby reducing external interference and improving the connection reliability of the electric connection column 214 and the battery monomer 20.

[0292] In a second aspect, the application provides a battery device. The battery device includes a plurality of battery monomers 20 according to any of the above embodiments, and the plurality of battery monomers 20 are arranged in a stack along a first direction, and the plug-in part 231 of one battery monomer 20 and the plug-in slot 241 of another battery monomer 20 are electrically connected by an elastic electric connection piece 22.

[0293] The elastic electric connection piece 22 is configured to elastically abut between the plug-in part 231 of one battery monomer 20 and the plug-in slot 241 of another adjacent battery monomer 20 when the one battery monomer 20 is electrically connected with the another adjacent battery monomer 20, so as to realize the electrical connection between the two adjacent battery monomers 20. Thus, the elastic electric connection piece 22 can realize the electrical connection between the two battery monomers 20, and can keep the two pole assemblies 21 in sufficient contact under static and dynamic conditions such as vibration impact, so as to improve the electrical contact area between the two adjacent battery monomers 20 to a certain extent, reduce the overcurrent impedance and heat generation, improve the electrical connection reliability between the two adjacent battery monomers 20, and reduce or avoid safety problems.

[0294] Optionally, in FIG. 3, the first direction is the front-rear direction, the second direction is the up-down direction, and the third direction is the left-right direction. The plurality of battery monomers 20 are arranged in a row along the first direction, and each row of battery monomers 20 forms a battery pack 50. The plurality of battery packs 50 are arranged along the third direction. In the first direction, the two pole assemblies 21 of the two adjacent battery monomers 20 are connected, so as to realize the electrical connection in one battery pack 50. Optionally, in the same battery pack 50, the two adjacent battery monomers 20 are connected in series.

[0295] Optionally, in FIG. 3, the battery device 100 includes four battery packs 50, which are arranged in a 2x2 manner. The number of battery cells 20 in each battery pack 50 can be the same or different. The battery packs 50 can be connected in series, in parallel, or in a mixed connection.

[0296] In FIG. 3, the battery device 100 further includes an explosion-proof valve 30, a battery management system 31, and a high-voltage box 32. The explosion-proof valve 30 is arranged on the front side plate of the second part 12. The explosion-proof valve 30 is used to discharge high-pressure gas in the box 10. The battery management system 31 and the high-voltage box 32 are arranged in the area of the accommodation space 13 close to the rear side plate of the second part 12. The battery management system 31 can be electrically connected to the high-voltage box 32 and the battery cells 20.

[0297] According to some embodiments of the present application, the battery device 100 optionally includes the conductive glue 40, which is located in the insertion slot 241 and connects the insertion part 231 and the first or second pole 23 or 24.

[0298] Optionally, please refer to FIGS. 13-29. In one embodiment, the second pole 24 is provided with an insertion slot 241, the first pole 23 is provided with an insertion part 231, and the conductive glue 40 is located in the insertion slot 241 and connects the insertion part 231 and the second pole 24.

[0299] In one embodiment, the first pole 23 is provided with an insertion slot 241, the second pole 24 is provided with an insertion part 231, and the conductive glue 40 is located in the insertion slot 241 and connects the insertion part 241 and the first pole 23.

[0300] In the above embodiments, the conductive glue 40 connects the insertion part 231 and the second pole 24, thereby increasing the overcurrent contact surface of the first and second poles 23 and 24 and improving the electrical conductivity.

[0301] Optionally, the conductive glue 40 can be applied or injected before the first and second poles 23 and 24 are assembled, to fill the cavity gap after assembly.

[0302] According to some embodiments of the present application, the insertion part 231 includes a first end surface 233 in the first direction, the first end surface 233 being located in the insertion slot 241, the first or second pole 23 or 24 includes a second end surface 246 facing the insertion slot 241 in the first direction, the conductive glue 40 connects the first end surface 233 and the second end surface 246, and the elastic electrical connection 22 connects the circumferential surface of the first or second pole 23 or 24 facing the insertion slot 241 and the circumferential surface of the insertion part 231.

[0303] Please refer to FIG. 3 and FIG. 20, the first direction is the front-rear direction. The first end surface 233 of the insertion portion 231 in the first direction is the front end surface of the insertion portion 231, and the second end surface 246 is the rear end surface of the second pole 24 facing the insertion slot 241. The conductive adhesive 40 connects the front end surface of the insertion portion 231 and the rear end surface of the second pole 24 facing the insertion portion 231, so that the insertion portion 231 and the second pole 24 can be connected at least at the two end surfaces.

[0304] Optionally, please refer to FIG. 20, the elastic electrical connection 22 connects the circumferential surface of the second pole 24 facing the insertion slot 241 and the circumferential surface of the insertion portion 231. In the first direction, the conductive adhesive 40 connects the first end surface 233 of the insertion portion 231 and the second end surface 246 of the second pole 24 facing the insertion slot 241, so that the first pole 23 and the second pole 24 can be connected in both the circumferential direction of the pole assembly 21 and the first direction, so that the first pole 23 and the second pole 24 are in sufficient contact.

[0305] In one embodiment, the elastic electrical connection 22 connects the circumferential surface of the first pole 23 facing the insertion slot 241 and the circumferential surface of the insertion portion 231. In the first direction, the conductive adhesive 40 connects the first end surface 233 of the insertion portion 231 and the second end surface 246 of the first pole 23 facing the insertion slot 241, so that the first pole 23 and the second pole 24 can be connected in both the circumferential direction of the pole assembly 21 and the first direction, so that the first pole 23 and the second pole 24 are in sufficient contact.

[0306] Further, under long-term use of the battery device 100, the expansion force of the battery cell 20 acts in the assembly direction of the pole assembly 21, which can also make the conductive adhesive 40 in sufficient contact with the contact surface of the insertion portion 231 and the second pole 24.

[0307] According to some embodiments of the present application, optionally, the insertion portion 231 and the insertion slot 241 are connected in an interference fit manner.

[0308] Please refer to FIG. 13 to FIG. 29, the second pole 24 is provided with the insertion slot 241, and the first pole 23 is provided with the insertion portion 231. The insertion portion 231 is inserted into the insertion slot 241. Except for the position connected by the elastic electrical connection 22, the contact between the insertion portion 231 and the surface of the second pole 24 facing the insertion slot 241 can be a hard contact, forming an interference fit. A pre-tightening force is formed between the insertion portion 231 and the second pole 24, so that the insertion portion 231 and the second pole 24 are in more sufficient contact.

[0309] The first pole column 23 is provided with a plug groove 241, and the second pole column 24 is provided with a plug part 231, the plug part 231 is inserted into the plug groove 241, and the contact between the plug part 231 and the surface of the first pole column 23 facing the plug groove 241 can be hard contact, forming an interference fit, and a pre-tightening force is formed between the plug part 231 and the first pole column 23, so that the plug part 231 and the first pole column 23 are more fully contacted.

[0310] Optionally, in one embodiment, in the first direction, the conductive glue 40 connects the first end surface 233 of the plug part 231 and the second end surface 246 of the second pole column 24 facing the plug groove 241. After the battery device 100 is used for a long time, the pre-tightening force of the battery cell 20 assembly can make the conductive glue 40 fully contact the contact surface of the plug part 231 and the second pole column 24.

[0311] It can be understood that the interference amount of the plug part 231 matched with the plug groove 241 can be set according to specific needs.

[0312] According to some embodiments of the present application, optionally, please combine FIGS. 34-35, the battery device 20 includes a sampling member 41, in the first direction, the first pole 23 of one adjacent battery cell 20 is plugged with the second pole column 24 of another battery cell 20, and the sampling member 41 directly contacts the first pole column 23 and / or the second pole column 24 to collect parameter information of the adjacent corresponding battery cell 20.

[0313] Specifically, in one embodiment, the sampling member 41 directly contacts the first pole column 23 to collect parameter information of the battery cell 20 corresponding to the first pole column 23. In one embodiment, the sampling member 41 directly contacts the second pole column 24 to collect parameter information of the battery cell 20 corresponding to the second pole column 24. In one embodiment, the sampling member 41 directly contacts the first pole column 23 and the second pole column 24 to collect parameter information of the adjacent two battery cells 20.

[0314] The parameter information includes but is not limited to the voltage and temperature information of the battery cell 20.

[0315] In the above embodiment, by directly contacting the sampling member 41 with the first pole column 23 and / or the second pole column 24 to collect the parameter information of the corresponding battery cell 20, the sampling method can be adapted to the battery device 100 without a gasket structure design, a gasket structure design cannot set a sampling structure, etc., and the adaptability of the sampling method to the battery device 100 can be improved; at the same time, directly collecting the information of the pole column assembly 21 can also ensure the accuracy and reliability of the parameter information of the battery cell 20.

[0316] According to some embodiments of the present application, optionally, the contact mode of the sampling member 41 with the pole column assembly 21 includes at least one of the following:

[0317] The sampling member 41 is in direct contact with at least one of the first pole post 23 and the second pole post 24 in the axial direction of the pole post assembly 21.

[0318] The sampling member 41 is in direct contact with at least one of the first pole post 23 and the second pole post 24 in the circumferential direction of the pole post assembly 21.

[0319] The sampling member 41 is in direct contact with at least one of the first pole post 23 and the second pole post 24 in the radial direction of the pole post assembly 21.

[0320] In FIGS. 34-35, the first direction is the front-rear direction. The circumferential direction of the pole post assembly 21 is the 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. In the first direction, the electrical connection mode of the two adjacent battery monomers 20 can be series connection or parallel connection. When the electrical connection mode of the two adjacent battery monomers 20 is series connection, the two connected pole post assemblies 21 are opposite pole post assemblies 21, that is, one is a positive pole post assembly 21 and the other is a negative pole post assembly 21. When the electrical connection mode of the two adjacent battery monomers 20 is parallel connection, the two connected pole post assemblies 21 are same pole post assemblies 21, that is, both are positive pole post assemblies 21 or both are negative pole post assemblies 21.

[0321] Optionally, a plurality of battery monomers 20 can be arranged in a row along the first direction, and a plurality of rows of battery monomers 20 are arranged along the third direction, and the first direction is perpendicular to the third direction. In the first direction, the two pole post assemblies 21 of the two adjacent battery monomers 20 are connected, so that the two adjacent battery monomers 20 are electrically connected. In FIG. 3, the first direction is the front-rear direction, the second direction is the up-down direction, and the third direction is the left-right direction.

[0322] Optionally, the sampling member 41 can be a voltage sampling member 41 of the battery monomer 20, and can sample the voltage information of the battery monomer 20.

[0323] The sampling member 41 is a contact sampling member 41. The contact mode of the sampling member 41 with the pole post assembly 21 includes at least one of the following:

[0324] The sampling member 41 is in direct contact with at least one of the first pole post 23 and the second pole post 24 in the axial direction L of the pole post assembly 21 (hereinafter referred to as contact mode one);

[0325] The sampling member 41 is in direct contact with at least one of the first pole post 23 and the second pole post 24 in the circumferential direction of the pole post assembly 21 (hereinafter referred to as contact mode two);

[0326] The sampling member 41 is in direct contact with at least one of the first pole 23 and the second pole 24 of the pole assembly 21 in the radial direction D of the pole assembly 21 (hereinafter referred to as contact mode three).

[0327] In one embodiment, the sampling member 41 is in contact with the pole assembly 21 in contact mode one. In contact mode one, the sampling member 41 can be in direct contact with one of the poles in the axial direction L of the pole assembly 21, or in direct contact with the first pole 23 and the second pole 24. Contact mode one can be suitable for installing the sampling member 41 in a scenario where there is more space in the axial direction L of the pole assembly 21 and less space in the circumferential and radial directions D of the pole assembly 21, including but not limited to.

[0328] In one embodiment, the sampling member 41 is in contact with the pole assembly 21 in contact mode two. In contact mode two, the sampling member 41 can be in direct contact with one of the first pole 23 and the second pole 24 in the circumferential direction of the pole assembly 21, or in direct contact with the first pole 23 and the second pole 24. Contact mode two can be suitable for installing the sampling member 41 in a scenario where there is more space in the circumferential direction of the pole assembly 21 and less space in the axial direction L and the radial direction D of the pole assembly 21, including but not limited to.

[0329] In one embodiment, the sampling member 41 is in contact with the pole assembly 21 in contact mode three. In contact mode three, the sampling member 41 can be in direct contact with one of the first pole 23 and the second pole 24 in the radial direction D of the pole assembly 21, or in direct contact with the first pole 23 and the second pole 24. Contact mode three can be suitable for installing the sampling member 41 in 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, including but not limited to.

[0330] In one embodiment, the sampling member 41 is in contact with the pole assembly 21 in contact mode one and two. Optionally, the sampling member 41 can be in direct 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 direct contact with the other of the first pole 23 and the second pole 24 in the circumferential direction of the pole assembly 21. Optionally, the sampling member 41 can be in direct 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 direct 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. Optionally, the sampling member 41 can be in direct 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 direct 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.

[0331] In one embodiment, the contact mode of the sampling member 41 with the pole assembly 21 includes contact modes one and three. Alternatively, the sampling member 41 can be directly 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 directly in contact with the other of the first pole 23 and the second pole 24 in the radial direction D of the pole assembly 21. Alternatively, the sampling member 41 can be directly in contact with one of the first pole 23 and the second pole 24 in the axial direction L and the radial direction D of the pole assembly 21, and directly in contact with the other of the first pole 23 and the second pole 24 in the axial direction L and the radial direction D of the pole assembly 21. Alternatively, the sampling member 41 can be directly in contact with one of the first pole 23 and the second pole 24 in the radial direction D of the pole assembly 21, and directly in contact with the other of the first pole 23 and the second pole 24 in the axial direction L and the radial direction D of the pole assembly 21.

[0332] In one embodiment, the contact mode of the sampling member 41 with the pole assembly 21 includes contact modes two and three. Alternatively, the sampling member 41 can be directly in contact with one of the first pole 23 and the second pole 24 in the circumferential direction of the pole assembly 21, and directly in contact with the other of the first pole 23 and the second pole 24 in the radial direction D of the pole assembly 21. Alternatively, the sampling member 41 can be directly in contact with one of the first pole 23 and the second pole 24 in the circumferential direction and the radial direction D of the pole assembly 21, and directly in contact with the other of the first pole 23 and the second pole 24 in the circumferential direction and the radial direction D of the pole assembly 21. Alternatively, the sampling member 41 can be directly in contact with one of the first pole 23 and the second pole 24 in the radial direction D of the pole assembly 21, and directly in contact with the other of the first pole 23 and the second pole 24 in the circumferential direction and the radial direction D of the pole assembly 21.

[0333] In one embodiment, the contact mode of the sampling member 41 with the pole assembly 21 includes contact modes one, two and three, and the specific contact modes are explained above. To avoid redundancy, they will not be described in detail here.

[0334] In the battery device 100 of the technical solution of the present application, the sampling member 41 is directly 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 limitation of the space of the battery device 100 on the sampling member 41.

[0335] Optionally, the material of the sampling member 41 includes, but is not limited to, nickel, copper, etc. Optionally, the battery cell 20 includes an insulating member 43, which electrically isolates the pole assembly 21 from the end cover of the battery cell 20. Optionally, the two pole assemblies 21 can be connected by means including, but not limited to, welding, interference fit, insertion, buckling, etc. The two pole assemblies 21 are connected by means of insertion, i.e. by means of convex-concave fit. Optionally, the sampling member is connected to the output line 42, so that the collected parameter information of the battery cell 20 can be transmitted to a control unit, such as a voltage sampling control unit.

[0336] According to some embodiments of the present application, the plurality of battery cells 20 are connected in series. Optionally, in some embodiments, the plurality of battery cells 20 are connected in parallel. Optionally, in some embodiments, the plurality of battery cells 20 are connected both in series and in parallel.

[0337] In the above embodiments, various connection modes can be achieved inside the battery device 100, thereby completing more complex functional designs.

[0338] In the first direction, the electrical connection mode of the two adjacent battery cells 20 can be series connection or parallel connection. When the electrical connection mode of the two adjacent battery cells 20 is series connection, the two connected pole assemblies 21 are of different types, i.e. one is a positive pole assembly and the other is a negative pole assembly. When the electrical connection mode of the two adjacent battery cells 20 is parallel connection, the two connected pole assemblies 21 are of the same type, i.e. both are positive pole assemblies or both are negative pole assemblies.

[0339] Optionally, referring to FIGS. 34 and 35, the housing 25 is formed with a receiving groove 257, which is located on one surface (such as the rear surface in FIG. 35) of the battery cell 20 along the first direction, i.e. on the rear first wall surface 251. The receiving groove 257 is recessed towards the inside of the battery cell 20 relative to the surface of the battery cell 20 on which the receiving groove 257 is located. The receiving groove 257 is used to accommodate the pole 21. The first pole 23 and the second pole 24 of the two adjacent battery cells 20 along the first direction are inserted into the receiving groove 257. The receiving groove 257 can be located at the end of the housing 251. Exemplarily, the first wall surface 251 is rectangular, and the receiving groove 257 is formed at the corner of the rear first wall surface 251.

[0340] The accommodating groove 257 is recessed on the surface of the battery cell 20 and is used to accommodate the pole 21, so that the first pole 23, the second pole 24 and the sampling member 30 can be accommodated in the accommodating groove 257 when two adjacent battery cells 20 are connected, the interval of the two adjacent battery cells 20 in the first direction can be shortened, thereby facilitating the arrangement of more battery cells 20 in the limited volume space of the battery device 100, and improving the energy density of the battery device 100. The first pole 23 and the second pole 24 connected in the accommodating groove 257 can be of the same polarity or of different polarities.

[0341] Optionally, referring to FIGS. 34 and 35, the battery cell 20 is in the shape of a flat cuboid as a whole, and the length dimension of the battery cell 20 is much greater than the width dimension and the thickness dimension of the battery cell 20. The pole 21 can extend in the width direction of the battery cell 20 in the shape of a long strip and be arranged close to the end in the length direction of the battery cell 20. In this embodiment, the length dimension of the pole 21 is relatively small, and the pole 21 is in the shape of a short flat structure.

[0342] In a third aspect, the present application provides a power utilization device. The power utilization device includes the battery cell 20 of any of the above embodiments, and the battery cell 20 is used to provide electric energy, or the power utilization device includes the battery device 100 of any of the above embodiments, and the battery device 100 is used to provide electric energy.

[0343] The power utilization device can be the device or system of any of the above application battery devices 100. In some embodiments, the power utilization device can include one or more battery cells 20. In some embodiments, the power utilization device can include one or more battery devices 100.

[0344] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell; a pole column assembly arranged on the shell, the pole column assembly comprising a first pole column and a second pole column with opposite polarities, one of the first pole column and the second pole column is provided with a plug-in part, and the other is provided with a plug-in slot with a size matched with the plug-in part, the plug-in part is configured to be at least partially inserted into the plug-in slot of another battery monomer when one battery monomer is electrically connected with another adjacent battery monomer; a resilient electrical connector arranged in at least one of the plug-in part and the plug-in slot, and configured to elastically abut between the plug-in part of one battery monomer and the plug-in slot of another adjacent battery monomer when the one battery monomer is electrically connected with the another adjacent battery monomer, so as to realize the electrical connection of the two adjacent battery monomers.

2. The battery cell of claim 1, wherein, The resilient electrical connector extends along the length extension direction of the corresponding first pole column or second pole column.

3. The battery cell of claim 2, wherein, The resilient electrical connector comprises a plurality of resilient connecting parts, and the plurality of resilient connecting parts are arranged at intervals along the length extension direction of the corresponding first pole column or second pole column. Alternatively, The resilient electrical connector comprises one resilient connecting part, and the one resilient connecting part is arranged continuously along the length extension direction.

4. The battery cell of claim 3, wherein, The resilient connecting part comprises a plurality of connecting parts, and the plurality of connecting parts are arranged at intervals along the plug-in direction of the first pole column and the second pole column.

5. The battery cell of claim 4, wherein, The resilient connecting part comprises two connecting parts, which are a first connecting part and a second connecting part, and the first connecting part and the second connecting part are arranged at intervals along the plug-in direction of the corresponding first pole column and second pole column.

6. The battery cell of claim 4, wherein, Along the plug-in direction of the first pole column and the second pole column, the first pole column or the second pole column provided with the resilient connecting part is provided with a stress release slot at a position between any two adjacent connecting parts, and the resilient electrical connector is deformed and partially extends into the stress release slot when the first pole column and the second pole column are plug-in matched.

7. The battery cell of claim 6, wherein, Among two adjacent connecting parts located on both sides of the same stress release slot, one connecting part is connected to the corresponding first pole column or second pole column at a position adjacent to the stress release slot, and is movable relative to the first pole column or second pole column at a position away from the stress release slot, and the other connecting part is movable relative to the corresponding first pole column or second pole column at a position adjacent to the stress release slot, and is connected to the first pole column or second pole column at a position away from the stress release slot.

8. The battery cell of any one of claims 1 to 7, wherein, The resilient electrical connector is arranged in the plug-in slot, and / or the resilient electrical connector is arranged outside the plug-in part.

9. The battery cell of claim 1, wherein, The battery monomer comprises a containing slot arranged on the first pole column or the second pole column, and the resilient electrical connector comprises a resilient part located in the containing slot and connected to the side wall of the containing slot.

10. The battery cell of claim 9, wherein, The containing slot is arranged on the corresponding first pole column or second pole column.

11. The battery cell of any one of claims 1 to 10, wherein, The shell has two first side walls opposite to each other, the first side walls have a larger area than other side walls, the two first side walls are arranged opposite to each other along a first direction, and the first pole and the second pole are arranged on the first side walls or on the same first side wall.

12. The battery cell of claim 11, wherein, The first pole is provided with the plug-in part which protrudes from the first side wall where the first pole is arranged, and the plug-in groove is recessed relative to the first side wall where the second pole is arranged.

13. The battery cell of claim 11, wherein, The first pole is provided with the plug-in part which protrudes from the first side wall where the first pole is arranged, the second pole protrudes from the first side wall where the second pole is arranged, the end of the second pole which protrudes is provided with the plug-in groove, the plug-in groove is recessed relative to the end of the second pole towards the first side wall, and the depth of the recess of the plug-in groove is less than or equal to the height of the second pole which protrudes from the first side wall.

14. The battery cell according to claim 12 or 13, characterized in that, The first pole of one battery cell is opposite to the second pole of another battery cell adjacent to the one battery cell along the first direction, and at least a part of the plug-in part of the one battery cell is inserted into the plug-in groove of the another battery cell adjacent to the one battery cell along the first direction.

15. The battery cell of claim 12, wherein, The battery cell comprises an electrode assembly arranged in the shell, the electrode assembly comprises a main body and a tab connected to the end of the main body, the first side wall comprises a first area covering the main body and a second area covering the tab, the second area is close to the edge of the first side wall, and the first pole and the second pole are arranged in the second area and electrically connected to the tab.

16. The battery cell of claim 15, wherein, The main body comprises a winding or laminated pole piece coated with an active material layer to generate electric energy, and the area of the pole piece coated with the active material layer is opposite to the first area along the first direction.

17. The battery cell of claim 15, wherein, The first side wall is square, the first side wall has two short sides opposite to each other along a second direction and two long sides opposite to each other along a third direction, the length of the short side is less than the length 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 pole and the second pole extend along the length direction of the short side or the long side close to the second area and are in a strip shape.

18. The battery cell of claim 11, wherein, The battery cell comprises a pressure relief mechanism arranged on the surface of the shell other than the first side wall, and the pressure relief mechanism is used to crack the shell in advance when the internal pressure of the battery cell exceeds a pressure threshold.

19. The battery cell of any one of claims 1-9, wherein, The shell is provided with a mounting hole, and the pole assembly is arranged outside the mounting hole. Alternatively, part of the pole assembly is arranged outside the mounting hole, and part of the pole assembly penetrates into the shell through the mounting hole and cooperates with the shell.

20. The battery cell of claim 19, wherein, The shell comprises a shell body and a cover, the shell body is provided with an opening, and the cover seals the opening; and the pole assembly is arranged in any one of the shell body and the cover.

21. The battery cell of claim 1, wherein, The first pole or the second pole comprises a pole body and an electric connection column connected with the pole body, the electric connection column is provided with the elastic electric connection piece, and one end of the electric connection column away from the pole body is configured to be plugged with the second pole or the first pole of another adjacent battery cell.

22. The battery cell of claim 21, wherein, The pole body and the second pole or the first pole are both formed with the plugging groove; the two ends of the electric connection column are respectively formed with one of the plugging parts, one of the two plugging parts is plugged with the plugging groove of the pole body, and the other of the two plugging parts is plugged with the plugging groove of the second pole or the first pole of the adjacent battery cell.

23. The battery cell of claim 22, wherein, The pole body and the second pole or the first pole are both protruded from the side wall of the shell where each of them is located, and the protruded part of the pole body and the second pole or the first pole is respectively recessed towards the side wall of the shell to form the plugging groove; or, The pole body and the second pole or the first pole are both recessed towards the side wall of the shell where each of them is located to directly form the plugging groove.

24. The battery cell of claim 21, wherein, The pole body and the second pole or the first pole are both provided with the plugging part, and the two ends of the electric connection column are respectively formed with the plugging groove; one of the two plugging grooves is plugged with the plugging part of the pole body, and the other of the two plugging grooves is configured to be plugged with the plugging part of the second pole or the first pole of the adjacent battery cell.

25. The battery cell of claim 24, wherein, The pole body and the second pole or the first pole are both protruded on the side wall of the shell where each of them is located to directly form the plugging part; or, The pole body and the second pole or the first pole are both recessed on the side wall of the shell where each of them is located, and the plugging part protruded at the recessed position is smaller than the recessed size.

26. A battery device, characterized by Comprise: A plurality of battery cells according to any one of claims 1-25, the plurality of battery cells are arranged in a first direction, and the plugging part of one adjacent battery cell is electrically connected with the plugging groove of another battery cell through the elastic electric connection piece.

27. The battery device of claim 26, wherein, The battery device comprises conductive glue, the conductive glue is located in the plugging groove and connects the plugging part and the first pole or the second pole.

28. The battery device of claim 27, wherein, The plugging part comprises a first end face in the first direction, the first end face is located in the plugging groove, the first pole or the second pole comprises a second end face in the first direction towards the plugging groove, the conductive glue connects the first end face and the second end face, and the elastic electric connection piece connects the circumferential surface of the first pole or the second pole towards the plugging groove and the circumferential surface of the plugging part.

29. The battery device of any one of claims 26-28, wherein, The plugging part is connected with the plugging groove in an interference fit manner.

30. The battery device of claim 26, wherein, The battery device comprises a sampling piece, in the first direction, the first pole of one adjacent battery cell is plugged with the second pole of another battery cell, and the sampling piece directly contacts the first pole and / or the second pole to collect the parameter information of the adjacent corresponding part.

31. The battery device of claim 30, wherein, The contact of the sampling member with the pole assembly comprises at least one of: the sampling member is in direct contact with at least one of the first pole and the second pole in an axial direction of the pole assembly; the sampling member is in direct contact with at least one of the first pole and the second pole in a circumferential direction of the pole assembly; the sampling member is in direct contact with at least one of the first pole and the second pole in a radial direction of the pole assembly.

32. The battery device of claim 26, wherein, a plurality of the battery cells are connected in series; or, a plurality of the battery cells are connected in parallel; or, a plurality of the battery cells are connected both in series and in parallel.

33. An electrical device, comprising: a battery cell as claimed in any one of claims 1 to 25, the battery cell being for providing electrical energy, or; a battery device as claimed in any one of claims 26 to 32, the battery device being for providing electrical energy.

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