Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery cell includes: a case; the polar column assembly is arranged on the shell and comprises a first polar column and a second polar column which are opposite in polarity, one of the first polar column and the second polar column is provided with an inserting part, and the other one of the first polar column and the second polar column is provided with an inserting groove matched with the inserting part in size; the inserting part is configured to be at least partially inserted into the inserting groove of another battery monomer when one battery monomer is electrically connected with another adjacent battery monomer; and the elastic electric connecting piece is arranged in at least one of the inserting part and the inserting groove, and is configured to elastically abut between the inserting part of one battery single body and the inserting groove of another adjacent battery single body when one battery single body is electrically connected with another adjacent battery single body, so that the electric connection of the two battery single bodies is realized. According to the battery monomer provided by the embodiment of the invention, the electric connection reliability of the two battery monomers can be improved, and the safety problem is reduced or avoided.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a battery cell, a battery device, and an electrical device. Background Art

[0002] In the related art, a battery device includes a plurality of battery cells, and electrical connection between two battery cells is achieved through two pole columns. During the use of the battery device, vibration and shock often occur. In such a case, it may lead to insufficient contact of the electrical contact surface, poor electrical connection reliability between the two pole columns, and further result in problems such as low overcurrent capacity, excessive local resistance, serious heating, and even safety issues. Summary of the Utility Model

[0003] In view of the above problems, the present application provides a battery cell, a battery device, and an electrical device, which can avoid or alleviate to a certain extent the problem of poor electrical connection reliability between two pole columns.

[0004] In a first aspect, the present application provides a battery cell, which includes:

[0005] A housing;

[0006] A pole column assembly disposed on the housing, the pole column assembly includes 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 portion, and the other is provided with a plug-in slot adapted to the size of the plug-in portion. The plug-in portion is configured such that when one battery cell is electrically connected to an adjacent another battery cell, it can be at least partially inserted into the plug-in slot of the other battery cell;

[0007] An elastic electrical connector disposed on at least one of the plug-in portion and the plug-in slot, and configured such that when one battery cell is electrically connected to an adjacent another battery cell, it can elastically abut between the plug-in portion of one battery cell and the plug-in slot of the other adjacent battery cell to achieve electrical connection between two adjacent battery cells.

[0008] In the battery cell of the embodiment of the present application, the elastic electrical connector is disposed on at least one of the plug-in portion and the plug-in slot, and is configured such that when one battery cell is electrically connected to an adjacent another battery cell, it can elastically abut between the plug-in portion of one battery cell and the plug-in slot of the other adjacent battery cell to achieve electrical connection between two adjacent battery cells. Thus, the elastic electrical connector can keep the two pole columns of two adjacent battery cells in full contact under static and dynamic conditions such as vibration and shock, thereby improving the electrical contact area between the two battery cells to a certain extent, reducing the overcurrent impedance and heating problems, enhancing the electrical connection reliability between the two battery cells, and reducing or avoiding safety problems.

[0009] In some embodiments, the elastic electrical connector extends and is distributed along the length extension direction of the corresponding first pole column or second pole column.

[0010] In the above embodiments, the elastic electrical connector extends and is distributed along the length extension direction of the corresponding first pole column or second pole column. Thus, the portion of the elastic electrical connector in contact with the first pole column or the second pole column is distributed more evenly along the length extension direction of the corresponding first pole column or second pole column, avoiding a situation where the connection between the elastic electrical connector and the first pole column or the second pole column is relatively stable locally while being unstable locally, which may lead to a relatively high creepage potential locally.

[0011] In some embodiments, the elastic electrical connector includes a plurality of elastic connection portions, and the plurality of elastic connection portions are arranged at intervals along the length extension direction of the corresponding first pole column or second pole column. Alternatively, the elastic electrical connector includes one elastic connection portion, and the one elastic connection portion extends continuously along the length extension direction.

[0012] In the above embodiments, the plurality of elastic connection portions or the one elastic connection portion are arranged at intervals along the length extension direction of the corresponding first pole column or second pole column, thereby improving the stability of the contact between the elastic electrical connector and the first pole column or the second pole column to a certain extent.

[0013] In some embodiments, the elastic connection portion includes a plurality of connection portions, and the plurality of connection portions are arranged at intervals along the insertion direction of the first pole column and the second pole column.

[0014] In the above embodiments, the plurality of connection portions are arranged at intervals along the insertion direction of the first pole column and the second pole column. The first pole column and the second pole column can form an electrical connection through the plurality of elastic connection portions, thereby improving the electrical contact area between two adjacent battery cells to a certain extent, reducing the overcurrent impedance and heat generation, enhancing the electrical connection reliability between two adjacent battery cells, and reducing or avoiding safety problems.

[0015] In some embodiments, the elastic connection portion includes two connection portions, namely a first connection portion and a second connection portion, and the first connection portion and the second connection portion are arranged at intervals along the insertion direction of the corresponding first pole column and the second pole column.

[0016] In the above embodiments, the elastic connection portion includes the first connection portion and the second connection portion. Thus, the first pole column and the second pole column can form two electrical contact positions through the first connection portion and the second connection portion, which is beneficial to improving the stability of the contact between the first pole column and the second pole column.

[0017] In some embodiments, along the insertion direction of the first pole and the second pole, the first pole or the second pole provided with the elastic connection part is provided with a stress relief groove at any position between any two adjacent connection parts. When the first pole and the second pole are inserted and matched, the elastic electrical connector is deformed and can partially extend into the stress relief groove.

[0018] In the above embodiment, during the assembly process of the first pole and the second pole, when the elastic electrical connector is deformed, it can partially extend into the application release groove, so that the stress of the elastic electrical connector is released, and to a certain extent, the situation that the elastic electrical connector is damaged due to excessive extrusion is avoided.

[0019] In some embodiments, among two adjacent connection parts located on both sides of the same stress relief groove, one connection part is connected to the corresponding first pole or second pole at a position adjacent to the stress relief groove, and the position away from the stress relief groove can move relative to the first pole or the second pole. The position of the other connection part adjacent to the stress relief groove can move relative to the corresponding first pole or second pole, and the position away from the stress relief groove is connected to the first pole or the second pole.

[0020] In the above embodiment, among two adjacent connection parts located on both sides of the same application release groove, the position of one connection part away from the application release groove can move relative to the first pole or the second pole. Thus, when the first pole and the second pole are inserted and matched, the movable position can cause the connection part to deform. The position of the other connection part adjacent to the application release groove can move relative to the corresponding first pole or the second pole. Thus, when the first pole and the second pole are inserted and matched, the movable position can extend into the application release groove to release stress.

[0021] In some embodiments, the elastic electrical connector is arranged in the insertion groove, and / or the elastic electrical connector is arranged outside the insertion part.

[0022] In the above embodiment, the elastic electrical connector is arranged in the insertion groove. During the transportation and storage of the battery cell, etc., the elastic electrical connector is not easily damaged by external objects, thereby providing the service life of the elastic electrical connector to a certain extent. The elastic electrical connector is arranged outside the insertion part, which can facilitate the maintenance of the elastic electrical connector (for example, replacement, repair, etc.).

[0023] In some embodiments, the battery cell includes a receiving groove, the receiving groove is arranged on the first pole or the second pole, and the elastic electrical connector includes an elastic part, and the elastic part is located in the receiving groove and connected to the side wall of the receiving groove.

[0024] In the above embodiments, when the first pole column and the second pole column are assembled, the elastic electrical connector is deformed by the extrusion of the first pole column and the second pole column, and the elastic part is flattened. When the first pole column and the second pole column are assembled in place, the elastic part rebounds into the accommodation groove and is connected to the counterpart, so as to be in full contact with the counterpart (the second pole column or the insertion part).

[0025] In some embodiments, the accommodation groove extends and is formed in the corresponding first pole column or the second pole column.

[0026] In the above embodiments, the accommodation groove extends and is formed in the corresponding first pole column or the second pole column, so that the accommodation groove can be adapted to the elastic part in position, and the elastic part can be in full contact with the counterpart.

[0027] In some embodiments, the housing has two opposite first side walls, the area of the first side wall is larger than that of other side walls, the two first side walls are arranged opposite to each other in the first direction, and the first pole column and the second pole column are respectively arranged on the first side wall or on the same first side wall.

[0028] In the above embodiments, by arranging the pole column assembly on the first side wall with the largest area, the area of the pole column assembly can be increased, thereby increasing the over-current area of the electrical connection of the battery cell and ensuring the fast charging performance. At the same time, since the battery cell expands during use, and the first side wall with the largest area has a greater expansion force relative to other side walls, the insertion stability of the pole column assembly between the first side walls is better.

[0029] In some embodiments, the first pole column is provided with an insertion part, the insertion part protrudes from the first side wall where the first pole column is located, and the insertion groove is concave with respect to the first side wall where the second pole column is located.

[0030] In the above embodiments, the insertion part protrudes from the first side wall where the first pole column is located, the insertion groove is concave with respect to the first side wall where the second pole column is located, and the two battery cells are electrically connected by inserting the insertion part into the insertion groove. The part of the first pole column protruding from the first side wall can extend into the first side wall of another battery cell, so that the distance between the battery cells spaced in the first direction is shortened, saving space and being beneficial to improving the energy density.

[0031] In some embodiments, the first pole column is provided with an insertion part, the insertion part protrudes from the first side wall where the first pole column is located, the second pole column protrudes from its own first side wall, and the protruding end of the second pole column is formed with an insertion groove, the insertion groove is concave in the direction towards the first side wall with respect to the end of the second pole column, and the depth of the concave insertion groove is less than or equal to the height of the second pole column protruding from the first side wall.

[0032] In the above embodiments, the insertion part protrudes from the first side wall where the first pole column is located, the insertion slot is recessed with respect to the first side wall where the second pole column is located, and the first pole column and the second pole column of two adjacent battery cells are electrically connected by inserting the insertion part into the insertion slot, thereby efficiently connecting the two battery cells and improving the grouping efficiency of the battery device to a certain extent.

[0033] In some embodiments, the first pole column of one battery cell is directly opposite to the second pole column of another adjacent battery cell along the first direction, and the battery cell is configured such that at least a part of the insertion part is inserted into the insertion slot of another adjacent battery cell along the first direction.

[0034] In the above embodiments, the first pole column of one battery cell is directly opposite to the second pole column of another adjacent battery cell along the first direction, and the insertion part of the first pole column is partially or completely inserted into the insertion slot of the second pole column on another battery cell, so that two adjacent battery cells are inserted into each other in the first direction through the first pole column and the second pole column, realizing a stable and reliable electrical connection.

[0035] In some embodiments, the battery cell includes an electrode assembly, the electrode assembly is disposed in a housing, the electrode assembly includes a main body portion and a pole ear portion connected to an end of the main body portion, the first side wall includes a first region covering the main body portion and a second region covering the pole ear portion, the second region is close to the edge of the first side wall, and the first pole column and the second pole column are disposed in the second region and are electrically connected to the pole ear portion.

[0036] In the above embodiments, the first region covers the main body portion and the second region covers the pole ear portion. During the use of the battery cell, the expansion and deformation of the first side wall in the first region are relatively large. The first pole column and the second pole column are disposed in the second region, so that the pole column assembly is less affected by the expansion of the electrode assembly. In addition, the pole column assembly is disposed close to the edge of the first side wall, improving the high-voltage protection during assembly, maintenance, etc.

[0037] In some embodiments, the main body portion includes wound or laminated pole pieces, the pole pieces are 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 to the first region along the first direction.

[0038] In the above embodiments, the region of the pole piece coated with the active material layer is directly opposite to the first region along the first direction, minimizing the influence of the expansion and deformation of the pole piece on the insertion stability of the pole column assembly.

[0039] In some embodiments, the first sidewall is square. The first sidewall has two short sides opposite to each other along the second direction and two long sides opposite to each other along the 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 pairwise. The second region is disposed adjacent to one of the short sides and the long sides. The first pole column and the second pole column extend along the length direction of the short side or the long side adjacent to the second region and are strip-shaped.

[0040] In the above embodiments, the pole column assembly extends in a strip shape along the length direction of the adjacent short side or long side, which is beneficial to dispersing stress in the length direction of the edge of the first sidewall and improving the structural stability of the insertion of the pole column assembly.

[0041] In some embodiments, the battery cell includes a pressure relief mechanism. The pressure relief mechanism is disposed on the surface of the housing different from the first sidewall. The pressure relief mechanism is used to crack prior to the housing when the internal pressure of the battery cell exceeds the pressure threshold.

[0042] In the above embodiments, the pressure relief mechanism is disposed on the surface of the housing different from the first sidewall. When the internal pressure of the battery cell exceeds the threshold, the pressure relief mechanism cracks prior to other wall surfaces of the housing to release the internal pressure, thereby avoiding the risk of cracking of the first sidewall when the internal pressure of the battery cell is too high, reducing the influence of the excessive internal pressure of the battery cell on the pole column assembly, and further reducing the safety risk.

[0043] In some embodiments, the housing is provided with a mounting hole, and the entire pole column assembly covers outside the mounting hole.

[0044] In the above embodiments, the entire pole column assembly covers outside the mounting hole, which facilitates the assembly of the pole column assembly and the housing, simplifies the manufacturing process, and at the same time improves the reliability and stability of the connection between the pole column assembly and the housing, so that the pole column assembly and the housing are not easily separated from the housing due to vibration or external pulling during the charging and discharging process of the battery cell, nor are they easily cracked or damaged due to vibration or external pulling.

[0045] In some embodiments, a part of the pole column assembly covers outside the mounting hole, and a part of the pole column assembly passes through the mounting hole and extends into the housing to cooperate with the housing.

[0046] In the above embodiments, a part of the pole column assembly covers outside the mounting hole, and a part passes through the mounting hole and extends into the housing to cooperate with the housing, which is beneficial to improving the electrical connection stability and over-current capacity between the pole column assembly and the electrode assembly in the housing.

[0047] In some embodiments, the housing includes a housing body and a cover body. The housing body has an opening, and the cover body seals the opening. The pole column assembly is disposed on either the housing body or the cover body.

[0048] In the above embodiment, the shell body has an opening, and the cover body seals the opening; the pole assembly is arranged in either the shell body or the cover body, which facilitates the assembly and production of the shell body and the electrode assembly.

[0049] In some embodiments, the first pole or the second pole includes a pole body and an electrical connection pole, the electrical connection pole is connected to the pole body, an elastic electrical connector is provided on the electrical connection pole, and the end of the electrical connection pole away from the pole body is configured to be plugged into the second pole or the first pole of another adjacent battery cell.

[0050] In the above embodiment, the electrical connection between the two battery cells is achieved by configuring the end of the electrical connecting column away from the pole body to be plugged into the second pole or the first pole of another adjacent battery cell, which replaces the connection method of using a tab to weld the pole of an adjacent battery cell to achieve the electrical connection of the battery cell, thereby improving the defects such as cold welds and burst holes caused by welding the tab to the pole, thereby improving the reliability of the electrical connection between the battery cells; on the other hand, connecting the pole body and the second pole of adjacent battery cells through the electrical connecting column, compared with directly plugging the pole bodies of adjacent battery cells into each other, can not only unify and standardize the shape of each pole body to ensure the manufacturing efficiency of the pole body, but also facilitate the adjustment of the distance between adjacent battery cells through the middle electrical connecting column to adapt to the expansion of the battery cell, which can further improve the reliability of the electrical connection between the battery cells.

[0051] In some embodiments, the pole body and the second pole or the first pole are both formed with a plug-in slot; a plug-in portion is formed at each end of the electrical connection column, one of the two plug-in portions is plugged into the plug-in slot of the pole body, and the other of the two plug-in portions is plugged into the plug-in slot of the second pole or the first pole of the adjacent battery cell.

[0052] In the above embodiment, the electrical connection between the pole body, the electrical connection pole and the second pole is realized by inserting the plug-in portion into the plug-in slot, which is relatively simple to operate and relatively stable in connection. At the same time, the two battery cells that have completed the electrical connection can be exempted from welding, thereby avoiding the problem that the electrode assembly is easily damaged when the welding position of the pole assembly is disassembled.

[0053] In some embodiments, the pole body and the second pole or the first pole all protrude from the side walls of the shell where they are located, and the protruding parts of the pole body and the second pole or the first pole are each recessed toward the side wall of the shell to form insertion slots respectively.

[0054] In the above embodiment, the pole body and the second pole both protrude from the side wall of the housing where they are located, thereby reducing the impact of pole damage on the electrode assembly and other structures inside the battery cell. In addition, when the first pole and the second pole are formed separately from the battery cell, it is convenient to form and assemble.

[0055] In some embodiments, the pole column body and the second pole column or the first pole column are both recessed inward relative to the side wall of the housing where each is located, so as to directly form a plug-in groove.

[0056] In the above embodiments, the pole column body and the second pole column are recessed from the side wall of the housing where each is located into the housing to form a plug-in groove, so that the electrical connection column is directly inserted into the inner side of the surface of the battery cell. The pole column is not easily deformed under conditions such as collision, extrusion, and pulling, and the plug-in structure between the plug-in groove and the electrical connection column is relatively stable.

[0057] In some embodiments, the pole column body and the second pole column or the first pole column are both provided with plug-in portions, and plug-in grooves are respectively formed at both ends of the electrical connection column; one of the two plug-in grooves is plugged with the plug-in portion of the pole column body, and the other of the two plug-in grooves is configured to be plugged with the plug-in portion of the second pole column or the first pole column of an adjacent battery cell.

[0058] In the above embodiments, the electrical connection between the pole column body, the electrical connection column and the second pole column is realized by inserting the plug-in portion into the plug-in groove, the operation is relatively simple, and the connection is relatively stable. At the same time, the two battery cells that complete the electrical connection can be exempted from welding cooperation, thereby avoiding the problem that the electrode assembly is easily damaged when the welding position of the pole column assembly is disassembled.

[0059] In some embodiments, the pole column body and the second pole column or the first pole column both protrude from the side wall of the housing where each is located, so as to directly form a plug-in portion.

[0060] In the above embodiments, the pole column body and the second pole column protrude from the side wall of the housing where each is located, thereby reducing the influence of the damage of the pole column assembly on the structures such as the electrode assembly inside the battery cell. In addition, it is convenient for molding and assembly in the case where the pole column assembly and the battery cell are integrally formed.

[0061] In some embodiments, the pole column body and the second pole column or the first pole column are both recessed relative to the side wall of the housing where each is located, and a plug-in portion smaller than the recessed size protrudes at the recessed position.

[0062] In the above embodiments, the pole column body and the second pole column are recessed from the side wall of the housing where each is located into the interior of the housing, so that the electrical connection column is directly inserted into the inner side of the surface of the battery cell, and the plug-in portion and the plug-in groove are plugged on the inner side of the surface of the battery cell, thereby reducing external interference and improving the connection reliability between the electrical connection column and the battery cell.

[0063] Second, the present application provides a battery device, and the battery device includes:

[0064] A plurality of battery cells according to any one of the above embodiments, the plurality of battery cells are stacked and arranged in a first direction, and the plug-in portion of an adjacent battery cell is electrically connected to the plug-in groove of another battery cell through an elastic electrical connector.

[0065] In some embodiments, the battery device includes a conductive adhesive, which is located in the insertion slot and connects the insertion portion to the first pole or the second pole.

[0066] In the above embodiment, the conductive adhesive connects the insertion portion to the second pole, thereby increasing the overcurrent contact surface between the first pole and the second pole and improving the conductivity.

[0067] In some embodiments, the insertion portion includes a first end face in a first direction, the first end face is located in the insertion slot, the first pole or the second pole includes a second end face facing the insertion slot in the first direction, the conductive adhesive connects the first end face and the second end face, and the elastic electrical connector connects the circumferential surface of the first pole or the second pole facing the insertion slot and the circumferential surface of the insertion portion.

[0068] In the above embodiment, in the first direction, the conductive adhesive connects the first end face of the insertion portion and the second end face of the first pole facing the insertion slot, so that the first pole and the second pole can be connected in both the circumferential direction and the first direction of the pole assembly, thereby enabling the first pole and the second pole to be in full contact.

[0069] In some embodiments, the insertion portion is connected to the insertion slot in an interference fit manner.

[0070] In the above embodiment, the contact between the insertion portion and the surface of the pole facing the insertion slot can be a hard contact to form an interference fit, and a pre-tightening force is formed between the insertion portion and the pole, so that the contact between the insertion portion and the pole is more sufficient.

[0071] In some embodiments, the battery device includes a sampling member. In the first direction, the first pole of an adjacent battery cell is inserted into the second pole of another battery cell, and the sampling member is in direct contact with the first pole and / or the second pole to collect the corresponding parameter information of the adjacent battery cell.

[0072] In the above embodiment, by directly contacting the first pole and / or the second pole with the sampling member to collect the parameter information of the corresponding battery cell, it can be adapted to battery devices with no tab structure design, tab structure design where sampling structures cannot be set, etc., and can improve the adaptability of the sampling method to the battery device; at the same time, directly collecting the information of the pole can also ensure the accuracy and reliability of the parameter information of the battery cell.

[0073] In some embodiments, the contact mode between the sampling member and the pole assembly includes at least one of the following:

[0074] The sampling member is in direct contact with at least one of the first pole and the second pole in the axial direction of the pole assembly;

[0075] The sampling component is in direct contact with at least one of the first pole and the second pole in the circumferential direction of the pole component;

[0076] The sampling component is in direct contact with at least one of the first pole and the second pole in the radial direction of the pole component.

[0077] In the above embodiments, the sampling component is in direct contact with the pole component in at least one of the axial, circumferential, and radial directions of the pole component, realizing the electrical connection between the sampling component and the pole component. Thus, a flexible sampling connection scheme can be provided for different connection methods of the pole component, and the arrangement of the sampling component is more flexible, alleviating the limitation of the battery device space on the sampling component to a certain extent.

[0078] In some embodiments, multiple battery cells are connected in series; or,

[0079] multiple battery cells are connected in parallel; or,

[0080] multiple battery cells have both series and parallel connections.

[0081] In the above embodiments, diverse connection methods can be realized inside the battery device, thereby completing relatively complex functional designs.

[0082] In a third aspect, the present application provides an electrical device, which includes the battery cell of any of the above embodiments, and the battery cell is used to provide electrical energy, or; the battery device of any of the above embodiments, and the battery device is used to provide electrical energy.

[0083] In the battery device and the electrical device of the embodiments of the present application, the elastic electrical connector is disposed in at least one of the plugging portion and the plugging slot, and is configured such that when one battery cell is electrically connected to another adjacent battery cell, it can elastically abut between the plugging portion of one battery cell and the plugging slot of another adjacent battery cell to realize the electrical connection between two adjacent battery cells. Thus, the elastic electrical connector can keep the two poles of two adjacent battery cells in full contact under static and dynamic conditions such as vibration and shock, thereby increasing the electrical contact area between the two battery cells to a certain extent, reducing the overcurrent impedance and heating problems, improving the electrical connection reliability between the two battery cells, and reducing or avoiding safety problems.

[0084] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. Description of the Drawings

[0085] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiments. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Also, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0086] Figure 1 Schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0087] Figure 2 Schematic diagram of the structure of a battery device according to some embodiments of the present application;

[0088] Figure 3 Exploded view schematic diagram of a battery device according to some embodiments of the present application;

[0089] Figure 4 Exploded view schematic diagram of a battery cell according to some embodiments of the present application;

[0090] Figure 5 Schematic diagram of two battery cells before assembly according to some embodiments of the present application;

[0091] Figure 6 Schematic diagram of two battery cells before assembly according to some other embodiments of the present application;

[0092] Figure 7 For the present application Figure 4 Schematic diagram of the battery cell in the front view perspective according to the embodiment shown in the present application;

[0093] Figure 8 For the present application Figure 5 Schematic diagram of the battery cell in the front view perspective according to the embodiment shown in the present application;

[0094] Figure 9 Schematic diagram of a battery module according to some embodiments of the present application;

[0095] Figure 10 Schematic diagram of two battery cells before assembly according to some embodiments of the present application;

[0096] Figure 11 Schematic diagram of the structure of a battery cell according to some embodiments of the present application;

[0097] Figure 12 Schematic diagram of two battery cells before assembly according to some embodiments of the present application;

[0098] Figures 13 to 14 Schematic diagram of the structure of a first pole column according to some embodiments of the present application;

[0099] Figure 15 Schematic diagram of the structure of a second pole column according to some embodiments of the present application;

[0100] Figure 16 Schematic cross-sectional view of the second pole column in some embodiments of the present application;

[0101] Figure 17 Schematic diagram of the assembly of two battery cells in some embodiments of the present application;

[0102] Figure 18 Schematic cross-sectional view of the assembly of two battery cells in some embodiments of the present application;

[0103] Figure 19 is Figure 18 an enlarged view of part A1 of

[0104] Figure 20 is Figure 19 an enlarged view of part A2 of

[0105] Figure 21 Schematic diagram before the assembly of two battery cells in some embodiments of the present application;

[0106] Figure 22 Schematic cross-sectional view before the assembly of two battery cells in some embodiments of the present application;

[0107] Figure 23 is Figure 22 an enlarged view of part C1 of

[0108] Figure 24 is Figure 23 an enlarged view of part C2 of

[0109] Figure 25 Schematic diagram of the assembly process of two battery cells in some embodiments of the present application;

[0110] Figure 26 Schematic cross-sectional view of the assembly process of two battery cells in some embodiments of the present application;

[0111] Figure 27 is Figure 26 an enlarged view of part B1 of

[0112] Figure 28 is Figure 27 an enlarged view of part B2 of

[0113] Figure 29 Schematic diagram before the assembly of the first pole column and the second pole column in some embodiments of the present application;

[0114] Figure 30 One of the partial cross-sectional schematic views of the battery device in some embodiments of the present application;

[0115] Figure 31The second partial cross-sectional view of the battery device according to some embodiments of the present application;

[0116] Figure 32 The third partial cross-sectional view of the battery device according to some embodiments of the present application;

[0117] Figure 33 The fourth partial cross-sectional view of the battery device according to some embodiments of the present application;

[0118] Figure 34 The structural schematic diagram of a battery cell according to some embodiments of the present application;

[0119] Figure 35 is Figure 34 The structural schematic diagram of the battery cell from a top-down perspective;

[0120] Figure 36 The fifth partial cross-sectional view of the battery device according to some embodiments of the present application;

[0121] Figure 37 The sixth partial cross-sectional view of the battery device according to some embodiments of the present application.

[0122] The main component reference numerals are as follows:

[0123] Vehicle 1000;

[0124] Battery device 100, controller 200, motor 300;

[0125] Box body 10, first part 11, second part 12, accommodation space 13;

[0126] Battery cell 20, terminal assembly 21, stress relief groove 211, receiving groove 212, terminal body 213, electrical connection post 214, elastic electrical connector 22, first end 221, second end 222, elastic part 223, elastic connection part 224, first connection part 225, second connection part 226, first terminal 23, insertion part 231, first base 232, first end face 233, second terminal 24, insertion slot 241, slot bottom surface 2411, inner circumferential surface of the slot 2412, second base 242, mating part 243, first surface 244, second surface 245, second end face 246, opening 247, housing 25, first side wall 251, first region 2511, second region 2512, short side 2513, long side 2514, receiving groove 257, electrode assembly 26, main body part 261, tab part 262, housing body 252, opening 2521, cover body 253, pressure relief mechanism 254;

[0127] Explosion-proof valve 30, battery management system 31, high-voltage box 32;

[0128] Conductive adhesive 40, sampling part 41, output wire 42, insulating part 43;

[0129] Battery pack 50. Detailed implementation manners

[0130] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0131] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims and above drawings of this application are intended to cover non-exclusive inclusion.

[0132] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0133] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0134] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0135] In the description of the embodiments of this application, the term "a plurality of" refers to two or more (including two). 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).

[0136] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0137] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0138] Currently, from the perspective of the development of the market situation, the application of power battery devices is becoming more and more extensive. Power battery devices are not only used in energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power battery devices, the market demand is also continuously increasing.

[0139] In the related art, a battery device includes a plurality of battery cells, and the electrical connection between two battery cells is achieved through two pole posts. During the use of the battery device, there are often vibrations and impacts. In this case, it may cause insufficient contact of the electrical contact surface, poor electrical connection reliability of the two pole posts, resulting in a small overcurrent capacity, too large local resistance, serious heating, and even safety problems.

[0140] In order to avoid or alleviate to a certain extent the problem of poor electrical connection reliability between two pole columns, the present application provides a battery cell. The battery cell includes a housing, a pole column assembly, and an elastic electrical connector. The pole column assembly is provided on the housing. The pole column assembly includes 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 portion, and the other of the two is provided with a plug slot whose size is adapted to the plug portion. The plug portion is configured such that when one battery cell is electrically connected to another adjacent battery cell, it can be at least partially inserted into the plug slot of the other battery cell. The elastic electrical connector is provided on at least one of the plug portion and the plug slot, and is configured such that when one battery cell is electrically connected to another adjacent battery cell, it can elastically abut between the plug portion of one battery cell and the plug slot of another adjacent battery cell to achieve electrical connection between two adjacent battery cells.

[0141] In such a battery cell, the elastic electrical connector is provided on at least one of the plug portion and the plug slot, and is configured such that when one battery cell is electrically connected to another adjacent battery cell, it can elastically abut between the plug portion of one battery cell and the plug slot of another adjacent battery cell to achieve electrical connection between two adjacent battery cells. Thus, the elastic electrical connector can keep the two pole columns of two adjacent battery cells in full contact under static conditions and dynamic conditions such as vibration and shock, thereby improving the electrical contact area between the two battery cells to a certain extent, reducing the overcurrent impedance and heat generation problems, enhancing the electrical connection reliability between the two battery cells, and reducing or avoiding safety problems.

[0142] The battery cell can be applied to a battery device. The battery device (Battery Apparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0143] In some embodiments, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells.

[0144] As an example, the battery cell assembly can be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties.

[0145] In some embodiments, the battery device may be a battery pack, which includes a box body and one or more battery cell assemblies accommodated in the box body.

[0146] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0147] As an example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0148] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. The "closed" here means covered or closed, which may be sealed or unsealed. The first box body may be an upper cover or a bottom plate.

[0149] As an example, the box body may include an upper cover, a frame, and a bottom plate. The upper cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0150] In some embodiments, the box body may be part of the chassis structure of a vehicle. For example, a part of the box body may become at least a part of the floor of the vehicle, or a part of the box body may become at least a part of the cross beam and longitudinal beam of the vehicle.

[0151] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0152] For the convenience of description, the following embodiments take a vehicle 1000, which is an electrical device in an embodiment of the present application, as an example for description.

[0153] Please refer to Figure 1 , Figure 1Schematic structural diagram of vehicle 1000 provided by some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device 100 is disposed inside vehicle 1000. The battery device 100 can be disposed at the bottom, head, or tail of vehicle 1000. The battery device 100 can be used to supply power to vehicle 1000. For example, the battery device 100 can serve as the operating power source of vehicle 1000. Vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of vehicle 1000.

[0154] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of vehicle 1000, but also serve as the driving power source of vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0155] Please refer to Figures 2 to 3 , Figure 2 Schematic structural diagram of battery device 100 provided by some embodiments of the present application, Figure 3 Exploded structural diagram of battery device 100 provided by some embodiments of the present application. The battery device 100 includes a box body 10 and battery cells 20. The battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space 13 for the battery cells 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. The first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define an accommodation space 13 for accommodating the battery cells 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure. The first part 11 covers or snaps onto the open side of the second part 12, so that the first part 11 and the second part 12 jointly define the accommodation space 13; the first part 11 and the second part 12 can also both be hollow structures with one side open, and the open side of the first part 11 covers or snaps onto 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 be of various shapes, such as a cylinder, a cuboid, etc.

[0156] In the battery device 100, there may be multiple battery cells 20. The multiple battery cells 20 can be connected in series, parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10. Of course, in the battery device 100, multiple battery cells 20 can also be first connected in series, parallel, or in a combined series-parallel connection to form a battery module, and then multiple battery modules are connected in series, parallel, or in a combined series-parallel connection 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 busbar component for realizing the electrical connection among the multiple battery cells 20.

[0157] Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0158] In a first aspect, please refer to Figures 4 to 20 , an embodiment of the present application provides a battery cell 20 including a housing 25, a pole assembly 21, and an elastic electrical connector 22. The pole assembly 21 is provided on the housing 25. 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 portion 231, and the other is provided with a plug slot 241 whose size is adapted to the plug portion 231. The plug portion 231 is configured such that when one battery cell 20 is electrically connected to an adjacent another battery cell 20, it can be at least partially inserted into the plug slot 241 of the another battery cell 20.

[0159] The elastic electrical connector 22 is disposed on at least one of the plug portion 231 and the plug slot 241, and is configured such that when one battery cell 20 is electrically connected to an adjacent another battery cell 20, it can elastically abut between the plug portion 231 of one battery cell 20 and the plug slot 241 of an adjacent another battery cell 20 to realize the electrical connection between two adjacent battery cells 20.

[0160] The battery cell 20 can refer to the smallest unit that composes the battery device 100. The battery cell includes an electrode assembly. The housing 25 is a component used to form the internal environment of the battery cell 20. Among them, the formed internal environment can be used to accommodate the electrode assembly 26, the electrolyte, and other components. The housing 25 can be in various shapes and various sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 25 can be determined according to the specific shape and size of the electrode assembly 26. The material of the housing 25 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this.

[0161] Optionally, in combination with Figures 4 to 6 , in some examples, the housing 25 is in the shape of a cuboid or a flat body, and the housing 25 has six surfaces: front, rear, left, right, top, and bottom. In this application, 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 first terminal 23 and the second terminal 24 can be provided on any surface of the housing 25. The first terminal 23 and the second terminal 24 can be provided on the same surface of the housing 25, or on different surfaces.

[0162] Optionally, in one embodiment, the first terminal 23 is provided with a plug-in portion 231, and the second terminal 24 is provided with a plug-in slot 241 whose size is adapted to that of the plug-in portion 231. Optionally, in one embodiment, the second terminal 24 is provided with a plug-in portion 231, and the first terminal 23 is provided with a plug-in slot 241 whose size is adapted to that of the plug-in portion 231.

[0163] Optionally, in combination with Figure 20 , the subsequent battery cell includes a plug-in portion, which is configured such that when a subsequent battery cell is electrically connected to a previous battery cell, it can be at least partially inserted into the plug-in slot of the previous battery cell, so that the terminal assemblies 21 of two adjacent battery cells are plugged into each other, thereby enabling the first terminal 23 and the second terminal 24 to be connected in a complementary convex-concave manner. Welding with a tab or bolt connection between the two terminal assemblies 21 can be cancelled, improving the grouping efficiency of the battery device, the maintainability after sales, and the cascade utilization of the battery device.

[0164] Optionally, the first terminal 23 and the second terminal 24 can be connected by a mortise-and-tenon type of plug-in connection, and the size of the plug-in portion 231 is adapted to that of the plug-in slot 241. Thus, the cooperation between the first terminal 23 and the second terminal 24 is relatively tight, improving the connection reliability of the terminal assembly 21 to a certain extent.

[0165] Optionally, in one embodiment, the first terminal 23 is the positive terminal, and the second terminal 24 is the negative terminal. Optionally, in one embodiment, the first terminal 23 is the negative terminal, and the second terminal 24 is the positive terminal. Optionally, in combination with Figures 4 to 6 , in some examples, the previous battery cell 20 includes the first terminal 23, and the first terminal 23 is provided with a plug-in portion 231. The subsequent battery cell 20 includes the second terminal 24, and the second terminal 24 is provided with a plug-in slot 241. Thus, two battery cells 20 connected through the plug-in portion 231 on the first terminal 23 and the plug-in slot 241 on the second terminal 24 in the front-rear direction can be connected in series.

[0166] Optionally, in one embodiment, the number of terminal assemblies 21 on the same surface can also be two (such as Figures 9 to 10 ) or more than two.

[0167] Optionally, in one embodiment, please combine Figure 29 , the elastic electrical connector 22 is disposed outside the insertion portion 231. Optionally, please combine Figures 15 to 28 , in one embodiment, the elastic electrical connector 22 is disposed in the insertion groove 241. Optionally, in one embodiment, the elastic electrical connector 22 is disposed outside the insertion portion 231 and in the insertion groove 241.

[0168] The elastic electrical connector 22 is configured such that when one battery cell 20 is electrically connected to another adjacent battery cell 20, it can elastically abut between the insertion portion 231 of one battery cell 20 and the insertion groove 241 of another adjacent battery cell 20 to achieve electrical connection between two adjacent battery cells 20. Thus, the elastic electrical connector 22 can achieve electrical connection between two battery cells 20. The elastic electrical connector 22 can keep the two pole assemblies 21 in full contact under static and dynamic conditions such as vibration and shock, thereby improving the electrical contact area between two adjacent battery cells 20 to a certain extent, reducing the overcurrent impedance and heat generation, enhancing the electrical connection reliability between two adjacent battery cells 20, and reducing or avoiding safety problems. The elastic electrical connector 22 includes, but is not limited to, an elastic reed.

[0169] For ease of description, this application takes the first pole 23 having an insertion portion 231 and the second pole 24 having an insertion groove 241 as an example for illustration.

[0170] Optionally, please combine Figures 17 to 28 , the elastic electrical connector 22 can be disposed in the insertion groove 241 and connected to the surface of the second pole 24 facing the insertion groove 241.

[0171] Optionally, please combine Figure 29 , in one embodiment, the elastic electrical connector 22 can be disposed outside the insertion portion 231.

[0172] Optionally, please combine Figures 17 to 28 , in one embodiment, the first pole 23 is provided with an insertion portion 231, the second pole 24 is provided with an insertion groove 241, and the insertion portion 231 can contact the surface of the second pole 24 facing the inside of the insertion groove 241, thereby increasing the connection area between the two pole assemblies 21. Optionally, please combine Figures 13 to 16 , the first pole 23 includes a first base 232, and the insertion portion 231 is disposed on the first base 232. The second pole 24 includes a second base 242 and a mating portion 243, the mating portion 243 is disposed on the second base 242, and the mating portion 243 is provided with an insertion groove 241.

[0173] According to some embodiments of the present application, optionally, the housing 25 has two first side walls 251 facing away from each other, and the area of the first side wall 251 is larger than that of the other side walls. The two first side walls 251 are arranged facing away from each other in the first direction, and the first pole 23 and the second pole 24 are respectively arranged on the first side wall 251 or on the same first side wall 251.

[0174] Optionally, please refer to Figures 4 to 6 , in some examples, the housing 25 is in the shape of a cuboid or a flat body. The housing 25 has six surfaces including the front, rear, left, right, top, and bottom. The first direction is the front-rear direction, and the first side walls 251 form the front surface and the rear surface of the housing 25. The areas of the two first side walls 251 at the front and rear are substantially the same, and both are larger than the surface area of any one of the left, right, top, and bottom sides of the housing 25.

[0175] Optionally, please refer to Figures 4 to 6 , in some examples, a pole assembly 21 is provided on the front first side wall 251. The pole assembly 21 on the front first side wall 251 can be a positive pole or a negative pole. A pole assembly 21 is provided on the rear first side wall 251. 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 front first side wall 251. Thus, two battery cells 20 connected through the pole assembly 21 in the front-rear direction can be connected in series.

[0176] Optionally, a first pole 23 can be provided on the front first side wall 251, and a second pole 24 can be provided on the rear first side wall 251.

[0177] Optionally, in one embodiment, the number of pole assemblies 21 on the same first side wall 251 can also be two (such as Figures 9 to 11 ) or more than two.

[0178] Optionally, in one embodiment, please refer to Figure 11 , the first direction is the front-rear direction, and the first pole 23 and the second pole 24 are respectively arranged on two first side walls 251 facing away from each other. Two first poles 23 are provided on the front first side wall 251, and two second poles 24 are provided on the rear first side wall 251. The two first poles 23 on the front are negative poles or positive poles ( Figure 11 are negative poles), and the two second poles 24 on the rear are both positive poles or negative poles ( Figure 11 are positive poles). Thus, two battery cells 20 connected through the pole assembly 21 in the front-rear direction are connected in series.

[0179] Optionally, in one embodiment, please refer to Figure 12, the first direction is the front - rear direction. The first pole post 23 and the second pole post 24 are respectively arranged on two opposite first side walls 251. There are two first pole posts 23 on the front first side wall 251, and two second pole posts are arranged on the rear first side wall 251. Among the two first pole posts 23 at the front, one is the negative pole post and the other is the positive pole post. Among the two second pole posts at the rear, one is the positive pole post and the other is the negative pole post. Thus, the two battery cells 20 connected by the pole post assembly 21 along the front - rear direction are connected in parallel.

[0180] When connected in parallel, the negative pole post on the rear first side wall 251 of the front battery cell 20 can be plugged and connected to the negative pole post on the front first side wall 251 of the rear battery cell 20, and the positive pole post on the rear first side wall 251 of the front battery cell 20 can be plugged and connected to the positive pole post on the front first side wall 251 of the rear battery cell 20.

[0181] Optionally, in one embodiment, the first pole post 23 and the second pole post 24 are arranged on the same first side wall 251.

[0182] In the above - mentioned embodiment, by arranging the pole post assembly 21 on the first side wall 251 with the largest area, the area of the pole post assembly 21 can be increased, thereby increasing the over - current 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 greater expansion force relative to other side walls, the plug - in stability of the pole post assembly 21 between the first side walls 251 is better.

[0183] According to some embodiments of the present application, optionally, the first pole post 23 is provided with a plug - in portion 231 that protrudes from the first side wall 251 where the first pole post 23 is located, and the plug - in slot 241 is concave relative to the first side wall 251 where the second pole post 24 is located.

[0184] Specifically, combined with Figures 13 to 16 , the first pole post 23 and the second pole post 24 are connected by a mortise - and - tenon plug - in method, and the size of the plug - in portion 231 is adapted to the size of the plug - in slot 241. Thus, the cooperation between the first pole post 23 and the second pole post 24 is relatively tight, and to a certain extent, the connection reliability of the pole post assembly 21 is improved.

[0185] It should be noted that in this embodiment, the plug - in portion 231 protrudes from the first side wall 251 where the first pole post 23 is located, and the first base 232 of the first pole post 23 can protrude relative to the first side wall 251 or sink into the housing 25 relative to the first side wall 251.

[0186] Two battery cells 20 arranged in the first direction can be plugged into each other through the plugging portion 231 of one battery cell 20 and the plugging slot 241 of the other battery cell 20, so as to efficiently connect the two battery cells 20, thereby improving the grouping efficiency of the battery device 100 to a certain extent.

[0187] In the above embodiment, the plugging portion 231 protrudes from the first side wall 251 where the first pole 23 is located, the plugging slot 241 is concave with respect to the first side wall 251 where the second pole 24 is located, and the two battery cells 20 are electrically connected by inserting the plugging portion 231 into the plugging slot 241. The part of the first pole 23 protruding from the first side wall 251 can extend into the first side wall 251 of another battery cell 20, so that the distance between the battery cells 20 spaced in the first direction is shortened, saving space and being beneficial to improving the energy density.

[0188] According to some embodiments of the present application, optionally, the first pole 23 is provided with a plugging portion 231, the plugging portion 231 protrudes from the first side wall 251 where the first pole 23 is located, the second pole 24 protrudes from the first side wall 251 where it is located, and a plugging slot 241 is formed at the protruding end of the second pole 24. The plugging slot 241 is recessed in the direction of the first side wall 251 with respect to the end of the second pole 24, and the depth of the recess of the plugging slot 241 is less than or equal to the height of the second pole 24 protruding from the first side wall 251.

[0189] Optionally, please combine Figure 20 ., the plugging portion 231 can be in contact with the surface of the second pole 24 facing the plugging slot 241, so as to increase the connection area of the two pole assemblies 21. Optionally, please combine Figures 13 to 16 ., the first pole 23 includes a first base 232, and the plugging portion 231 is arranged on the first base 232. The second pole 24 includes a second base 242 and a matching portion 243, the matching portion 243 is arranged on the second base 242, and the matching portion 243 is provided with a plugging slot 241. In this embodiment, the matching portion 243 protrudes from the first side wall 251 where the second pole 24 is located, the first base 232 can protrude relative to the first side wall 251 or be recessed into the housing 25 relative to the first side wall 251, and the first base 232 can also be partially or completely fitted into the first side wall 251.

[0190] In the above embodiment, the plugging portion 231 protrudes from the first side wall 251 where the first pole 23 is located, the plugging slot 241 is concave with respect to the first side wall 251 where the second pole 24 is located, and the first pole 23 and the second pole 24 of adjacent two battery cells 20 are electrically connected by inserting the plugging portion 231 into the plugging slot 241, so as to efficiently connect the two battery cells 20, thereby improving the grouping efficiency of the battery device 100 to a certain extent.

[0191] According to some embodiments of the present application, optionally, the first pole 23 of a battery cell 20 is directly opposite to the second pole 24 of another battery cell 20 adjacent along the first direction, and the battery cell 20 is configured so that at least a portion of the plug-in portion 231 is inserted into the plug-in slot 241 of another battery cell 20 adjacent along the first direction.

[0192] For details, please refer to Figures 17 to 20 The first pole 23 and the second pole 24 may both extend in a straight line along the first direction, protrude from the first side wall 251 or be recessed relative to the first side wall 251. The first pole 23 and the second pole 24 are directly opposite to each other along the first direction, and the first pole 23 and the second pole 24 of two battery cells 20 adjacent to each other along the first direction are directly opposite to each other along the first direction, and a pair of first electrodes and second electrodes on the two battery cells 20 that are plugged into each other are plugged into each other along the first direction.

[0193] In the above embodiment, the first pole 23 of one battery cell 20 is directly opposite to the second pole 24 of another battery cell 20 adjacent to the first direction along the first direction, and the plug-in portion 231 of the first pole 23 is partially or completely inserted into the plug-in slot 241 of the second pole 24 on the other battery cell 20, so that the two adjacent battery cells 20 are plugged into each other in the first direction through the first pole 23 and the second pole 24, thereby achieving a stable and reliable electrical connection.

[0194] According to some embodiments of the present application, optionally, please refer to Figure 4 , Figure 7 and Figure 8 The battery cell 20 includes an electrode assembly 26, which is arranged in the shell 25. The electrode assembly 26 includes a main body 261 and a pole ear portion 262 connected to the end of the main body 261. The first side wall 251 includes a first area 2511 covering the main body 261 and a second area 2512 covering the pole ear portion 262. The second area 2512 is close to the edge of the first side wall 251. The first pole 23 and the second pole 24 are arranged in the second area 2512 and are electrically connected to the pole ear portion 262.

[0195] Specifically, the electrode assembly 26 is a component in the battery cell 20 where electrochemical reactions occur. The housing 25 may contain one or more electrode assemblies 26. The electrode assembly 26 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body portion 261 of the electrode assembly 26, and the portions of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the tab portions 262. The positive tab portion and the negative tab portion may be located together at one end of the main body portion 261 or separately at both ends of the main body portion 261. During charging and discharging, the positive active material and the negative active material react with the electrolyte, and the tab portions 262 are connected to the terminal assembly 21 to form an electric current loop.

[0196] The housing 25 forms a receiving space, the electrode assembly 26 is received in the receiving space, and the first side wall 251 and the other side walls of the housing 25 surround the electrode assembly 26. The first side wall 251 covers the electrode assembly 26 in the first direction, the first region 2511 covers the main body portion 261 in the first direction, and the second region 2512 covers the tab portion 262 in the first direction. Due to the repeated oxidation-reduction reaction between the active material and the electrolyte during charging and discharging, the main body portion 261 is prone to releasing gas, causing the housing 25 to be prone to swelling. The degree of swelling and deformation of the first side wall 251 in the first region 2511 is significantly greater than that of the second side wall.

[0197] In the above embodiment, the first region 2511 covers the main body portion 261, and the second region 2512 covers the tab portion 262. During the use of the battery cell 20, the first side wall 251 has a larger swelling and deformation in the first region 2511. The first terminal 23 and the second terminal 24 are disposed in the second region 2512, such that the terminal assembly 21 is less affected by the swelling of the electrode assembly 26. In addition, the terminal assembly 21 is disposed near the edge of the first side wall 251, improving the high-voltage protection during assembly, maintenance, etc.

[0198] According to some embodiments of the present application, optionally, please refer to Figures 4 to 8 , the main body portion 261 includes wound or laminated electrode sheets, and the electrode sheets are coated with an active material layer (not shown in the figure) to generate electric energy. The region of the electrode sheet coated with the active material layer is directly opposite to the first region 2511 in the first direction.

[0199] Specifically, the active material layer is coated on the electrode sheet and is spaced from the tab portion 262 by a small distance at the edge of the electrode sheet where the tab portion 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 may be parallel to the active material layer, and the planes of the first region 2511 and the active material layer may both be perpendicular to the first direction.

[0200] In the above embodiments, the area of the pole piece coated with the active material layer faces the first region 2511 in the first direction, so as to minimize the influence of the expansion and deformation of the pole piece on the insertion stability of the pole column assembly 21.

[0201] According to some embodiments of the present application, optionally, please refer to Figures 5 to 8 , the first side wall 251 is square, the first side wall 251 has two short sides 2513 opposite to each other in the second direction (the up and down direction as shown in the figure) and two long sides 2514 opposite to each other in the third direction, the length of the short side 2513 is less than that of the long side 2514, the second direction, the third direction and the first direction are perpendicular to each other in pairs, the second region 2512 is arranged close to one of the short side 2513 and the long side 2514, and the first pole column 23 and the second pole column 24 extend along the length direction of the short side 2513 or the long side 2514 close to the second region 2512 and are strip-shaped.

[0202] Optionally, in combination with Figure 5 and Figure 7 , in an example, the first direction is Figure 7 the direction perpendicular to the paper surface in

[0203] Figure 6 Figure 8 and , in an example, the first direction is Figure 8 the direction perpendicular to the paper surface in

[0204] The mortise and tenon connection of the pole column assembly 21 in the first direction (the front and back direction as shown in the figure) improves the space utilization rate in the up and down direction.

[0205] ​In the above embodiments, the pole column assembly 21 extends in a strip shape along the length direction of the short side 2513 or the long side 2514 close to it, 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 insertion of the pole column assembly 21.

[0206] According to some embodiments of the present application, optionally, please refer to Figures 4 to 6 , the battery cell 20 includes a pressure relief mechanism 254, and the pressure relief mechanism 254 is arranged on the surface of the housing 25 different from the first side wall 251. The pressure relief mechanism 254 is used to crack prior to the housing 25 when the internal pressure of the battery cell 20 exceeds the pressure threshold.

[0207] Optionally, the pressure relief mechanism 254 forms a local wall thickness relatively shallower than the overall wall surface thickness on the housing 25 other than the first side wall 251 through notches, grooves, etc. As Figure 4 shown, the pressure relief mechanism 254 is arranged on the cover body 253 of the battery cell 20.

[0208] Optionally, the first side wall 251 is located at the front and rear sides of the battery cell 20, and the pressure relief mechanism 254 can be arranged on one of the left, right, upper, and lower side surfaces of the housing 25.

[0209] In the above embodiments, the pressure relief mechanism 254 is arranged on the surface of the housing 25 different from the first side wall 251. When the internal pressure of the battery cell 20 exceeds the threshold, the pressure relief mechanism 254 cracks prior to other wall surfaces of the housing 25 to release the internal pressure, thereby avoiding the risk of cracking of the first side wall 251 when the internal pressure of the battery cell 20 is too high, reducing the impact of the excessive internal pressure of the battery cell 20 on the pole column assembly 21, and further reducing the safety risk.

[0210] According to some embodiments of the present application, optionally, the housing 25 is provided with a mounting hole, and the pole column assembly 21 is entirely covered outside the mounting hole;

[0211] Or, a part of the pole column assembly 21 is covered outside the mounting hole, and a part of the pole column assembly 21 passes through the mounting hole and extends into the housing 25 to cooperate with the housing 25.

[0212] Specifically, the shape of the mounting hole (not shown in the figure) can match the cross-sectional shape of the pole column assembly 21. For example, the pole column assembly 21 is in the shape of a long strip runway, and the mounting hole (not shown in the figure) is also in the shape of a long strip runway with a size close to or the same. If the pole column assembly 21 is entirely covered outside the mounting hole (not shown in the figure), then the pole column assembly 21 is entirely located outside the housing 25.

[0213] A part of the pole column assembly 21 is covered outside the mounting hole (not shown in the figure), and the part of the pole column assembly 21 extending into the mounting hole (not shown in the figure) can be buckled with the housing 25 and connected to the electrode assembly 26.

[0214] The entire pole column assembly 21 is covered outside the mounting hole (not shown in the figure), which facilitates the assembly of the pole column assembly 21 and the housing 25, simplifies the manufacturing process, and at the same time improves the reliability and stability of the connection between the pole column assembly 21 and the housing 25, so that after the pole column assembly 21 and the housing 25 are fitted together, they are not easily separated from the housing 25 due to vibration or external pulling during the charge and discharge process of the battery cell 20, nor are they easily cracked or damaged due to vibration or external pulling.

[0215] A part of the pole column assembly 21 is covered outside the mounting hole (not shown in the figure), and a part thereof passes through the mounting hole (not shown in the figure) and extends into the housing 25 to cooperate with the housing 25, which is beneficial to improving the stability of the electrical connection between the pole column assembly 21 and the electrode assembly 26 in the housing 25 and the overcurrent capacity.

[0216] According to some embodiments of the present application, optionally, please refer to Figure 4 , the housing 25 includes a housing body 252 and a cover body 253. The housing body 252 has an opening 2521, and the cover body 253 is hermetically covered on the opening 2521; the pole column assembly 21 is disposed on either the housing body 252 or the cover body 253.

[0217] Specifically, the cover body 253 is a component that can cover the opening 2521 of the housing body 252 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the cover body 253 can be adapted to the shape of the housing body 252 to cooperate with the housing body 252. Optionally, the cover body 253 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the cover body 253 is not easily deformed when being squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved.

[0218] The pole column assembly 21 is disposed on either the housing body 252 or the cover body 253. The pole column assembly 21 is electrically connected to the electrode assembly 26 for outputting or inputting the electric energy of the battery cell 20. The material of the cover body 253 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special limitations in this regard. In some embodiments, an insulating member can also be disposed on the inner side of the cover body 253. The insulating member can be used to isolate the electrical connection components in the housing body 252 from the cover body 253 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0219] It should be noted that in the embodiment where the pressure relief mechanism 254 is disposed on the cover body 253, the pole column assembly 21 is only disposed on the housing body 252. In the embodiment where the pressure relief mechanism 254 is disposed on the housing body 252, the pole column assembly 21 is disposed on the cover body 253, or on a side of the housing body 252 different from the pressure relief mechanism 254.

[0220] The housing body 252 and the cover body 253 can be independent components. An opening 2521 can be provided on the housing body 252, and the cover body 253 is covered at the opening 2521 to form the internal environment of the battery cell 20. Without limitation, the cover body 253 and the housing body 252 can also be integrated. Specifically, the cover body 253 and the housing body 252 can form a common connection surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing body 252, the cover body 253 is then covered on the housing body 252.

[0221] In the above embodiment, the housing body 252 has an opening 2521, and the cover body 253 is hermetically covered at the opening 2521; the pole assembly 21 is provided on either the housing body 252 or the cover body 253, facilitating the assembly and production of the housing 25 and the electrode assembly 26.

[0222] According to some embodiments of the present application, optionally, the elastic electrical connector 22 extends and is distributed along the length extension direction of the corresponding first pole 23 or the second pole 24.

[0223] In the above embodiment, the elastic electrical connector 22 extends and is distributed along the length extension direction of the corresponding first pole 23 or the second pole 24. Thus, the portion of the elastic electrical connector 22 in contact with the first pole 23 or the second pole 24 is distributed more evenly along the length extension direction of the corresponding first pole 23 or the second pole 24, avoiding the situation that the elastic electrical connector 22 is more firmly connected to the first pole 23 or the second pole 24 locally and less firmly connected to the first pole 23 or the second pole 24 locally, resulting in a higher creepage potential locally.

[0224] Specifically, the elastic electrical connector 22 can be in a long strip shape, and the elastic electrical connector 22 is distributed along the length extension direction of the corresponding first pole 23 or the second pole 24. In one embodiment, please refer to Figure 3 and Figure 24 , the elastic electrical connector 22 extends and 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 Figure 3 up-and-down direction shown. The second pole 24 is provided with a plugging groove 241, and the elastic electrical connector 22 is arranged in the plugging groove 241 and is fixedly connected to the second pole 24 at one end.

[0225] In one embodiment, please refer to Figure 3 and Figure 29 , the elastic electrical connector 22 extends and 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 Figure 3 up-and-down direction shown. The first pole 23 is provided with a plugging portion 231, and the elastic electrical connector 22 is arranged outside the plugging portion 231 and is fixedly connected to the first pole 23 at one end.

[0226] According to some embodiments of the present application, optionally, the elastic electrical connector 22 includes a plurality of elastic connection portions 224, and the plurality of elastic connection portions 224 are arranged at intervals along the length extension direction of the corresponding first pole 23 or the second pole 24.

[0227] In the above embodiment, the plurality of elastic connection portions 224 are arranged at intervals along the length extension direction of the corresponding first pole 23 or the second pole 24, thereby improving the stability of the contact between the elastic electrical connector 22 and the first pole 23 or the second pole to a certain extent.

[0228] Specifically, in one embodiment, please refer to Figure 3 , Figure 15 and Figure 24 , each elastic connection portion 224 extends and 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 Figure 3 vertical direction shown. The second pole 24 is provided with a plug-in groove 241, and each elastic connection portion 224 is arranged in the plug-in groove 241 and is fixedly connected to the second pole 24 at one end. Please refer to Figure 15 and Figure 24 , on the right surface and the left surface of the second pole 24 facing the inside of the plug-in groove 241, a plurality of elastic connection portions 224 are respectively provided. The plurality of elastic connection portions 224 in the left-right direction can evenly abut against the plug-in portion 231 in the left-right direction, thereby improving the stability of the contact between the elastic electrical connector 22 and the first pole 23 to a certain extent.

[0229] In one embodiment, please refer to Figure 3 and Figure 29 , the elastic electrical connector 22 extends and 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 Figure 3 vertical direction shown. The first pole 23 is provided with a plug-in portion 231, and the elastic electrical connector 22 is arranged outside the plug-in portion 231 and is fixedly connected to the first pole 23 at one end. In Figure 29 , on the right surface and the left surface of the plug-in portion 231, a plurality of elastic connection portions 224 are respectively provided. When the plug-in portion 231 is inserted into the plug-in groove 241, the plurality of elastic connection portions 224 in the left-right direction can evenly abut against the second pole 24 in the left-right direction, thereby improving the stability of the contact between the elastic electrical connector 22 and the second pole 24 to a certain extent.

[0230] According to some embodiments of the present application, optionally, the elastic electrical connector 22 includes one elastic connection portion 224, and one elastic connection portion 224 extends continuously along the length extension direction.

[0231] In the above embodiments, an elastic connection portion 224 is arranged at intervals along the length extension direction of the corresponding first pole 23 or the second pole 24, thereby improving to a certain extent the stability of the elastic electrical connector 22 in contact with the first pole 23 or the second pole.

[0232] Specifically, in one embodiment, an elastic connection portion 224 extends and is distributed in a long ring shape along the length extension direction of the corresponding second pole 24, and the length extension direction of the second pole 24 is Figure 3 the up-and-down direction shown. The second pole 24 is provided with a plug-in groove 241, and the elastic connection portion 224 is arranged in the plug-in groove 241 and is fixedly connected to the second pole 24 at one end. The elastic connection 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, in the circumferential direction of the plug-in portion 231, the elastic connection portion 224 can evenly abut against the plug-in portion 231, thereby improving to a certain extent the stability of the elastic electrical connector 22 in contact with the first pole 23.

[0233] In one embodiment, an elastic connection portion 224 extends and is distributed in a long ring shape along the length extension direction of the corresponding first pole 23, and the length extension direction of the first pole 23 is Figure 3 the up-and-down direction shown. The first pole 23 is provided with a plug-in portion 231, and the elastic connection portion 224 is arranged outside the plug-in portion 231 and is 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, in the circumferential direction of the plug-in portion 231, the elastic connection portion 224 can evenly abut against the second pole 24, thereby improving to a certain extent the stability of the elastic electrical connector 22 in contact with the second pole 24.

[0234] According to some embodiments of the present application, optionally, the elastic connection portion 224 includes a plurality of connection portions, and the plurality of connection portions are arranged at intervals along the insertion direction of the first pole 23 and the second pole 24.

[0235] In the above embodiments, the plurality of connection portions are arranged at intervals along the insertion direction of the first pole 23 and the second pole 24. The first pole 23 and the second pole 24 can form an electrical connection through the plurality of elastic connection portions 224, thereby improving to a certain extent the electrical contact area between two adjacent battery cells, reducing the overcurrent impedance and heat generation, improving the electrical connection reliability between two adjacent battery cells, and reducing or avoiding safety problems.

[0236] Optionally, in one embodiment, please refer to Figure 15 and Figure 24, an elastic electrical connector 22 is disposed in the insertion slot 241, and a plurality of connecting portions are arranged at intervals along the insertion direction of the first pole 23 and the second pole 24. A plurality of electrical connecting portions are respectively disposed on the left surface and the right surface of the second pole 24 facing the insertion slot 241 along the insertion direction of the first pole 23 and the second pole 24.

[0237] Optionally, in one embodiment, please refer to Figure 29 , the elastic electrical connector 22 is disposed outside the insertion portion 231, and a plurality of connecting portions are arranged at intervals along the insertion direction of the first pole 23 and the second pole 24. A plurality of electrical connecting portions are respectively disposed on the left surface and the right surface of the insertion portion 231 along the insertion direction of the first pole 23 and the second pole 24.

[0238] According to some embodiments of the present application, optionally, the elastic connecting portion 224 includes two connecting portions, namely a first connecting portion 225 and a second connecting portion 226, and the first connecting portion 225 and the second connecting portion 226 are arranged at intervals along the insertion direction of the corresponding first pole 23 and the second pole 24.

[0239] In the above embodiment, the elastic connecting portion 224 includes the first connecting portion 225 and the second connecting portion 226, so that the first pole 23 and the second pole 24 can form two electrical abutting positions through the first connecting portion 225 and the second connecting portion 226, which is beneficial to improving the stability of the abutment between the first pole 23 and the second pole 24.

[0240] Specifically, the two electrical abutting positions formed by the first pole 23 and the second pole 24 through the first connecting portion 225 and the second connecting portion 226 can be arranged at intervals along the insertion direction of the first pole 23 and the second pole 24. Please refer to Figure 15 , the elastic electrical connector 22 is disposed in the insertion slot 241, and the first connecting portion 225 is closer to the slot opening of the insertion slot 241 than the second connecting portion 226. On the left surface of the second pole 24 facing the inside of the insertion slot 241, the first connecting portion 225 and the second connecting portion 226 respectively form two electrical abutting positions with the first pole 23. On the right surface of the second pole 24 facing the inside of the insertion slot 241, the first connecting portion 225 and the second connecting portion 226 respectively form two electrical abutting positions with the first pole 23.

[0241] Please refer to Figure 29 , the elastic electrical connector 22 is disposed outside the insertion portion 231, and the first connecting portion 225 is closer to the end of the insertion portion 231 than the second connecting portion 226. On the left side of the insertion portion 231, the first connecting portion 225 and the second connecting portion 226 respectively form two electrical abutting positions with the second pole 24. On the right side of the insertion portion 231, the first connecting portion 225 and the second connecting portion 226 respectively form two electrical abutting positions with the second pole 24.

[0242] According to some embodiments of the present application, optionally, along the plug-in direction of the first pole 23 and the second pole 24, the first pole 23 or the second pole 24 provided with an elastic connecting portion 224 is provided with an application release groove 211 at a position between any two adjacent connecting portions, and when the first pole 23 and the second pole 24 are plugged in, the elastic electrical connector 22 is deformed and can partially extend into the application release groove 211.

[0243] In the above embodiment, during the assembly process of the first pole 23 and the second pole 24, the elastic electrical connector 22 can partially extend into the release groove 211 when deformed, so that the stress of the elastic electrical connector 22 is released, thereby avoiding the situation where the elastic electrical connector 22 is damaged by excessive squeezing to a certain extent.

[0244] Optionally, in one embodiment, please combine Figures 13 to 28 The elastic electrical connector 22 is arranged in the plug-in slot 241, and the second pole 24 is provided with an application release slot 211 at a position between any two adjacent connection parts. One end of the connection part 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 plugged and matched, the elastic electrical connector 22 is deformed, and the movable end can extend into the application release slot 211.

[0245] Optionally, in one embodiment, please combine Figure 29 The elastic electrical connector 22 is arranged outside the plug-in portion 231, and the first pole 23 is provided with an application release groove 211 at a position between any two adjacent connection portions. One end of the connection portion is fixedly connected to the plug-in portion 231, and the other end is movable. When the first pole 23 and the second pole 24 are plugged and matched, the elastic electrical connector 22 is deformed, and the movable end can extend into the application release groove 211.

[0246] The shape of the application release groove 211 includes but is not limited to regular shapes such as rectangle and circle or irregular shapes.

[0247] According to some embodiments of the present application, optionally, among the 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 the second pole 24 at a position adjacent to the application release slot 211, and can move relative to the first pole 23 or the 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 the second pole 24 at a position adjacent to the application release slot 211, and is connected to the first pole 23 or the second pole 24 at a position away from the application release slot 211.

[0248] In the above embodiments, among two adjacent connecting portions located on both sides of the same application release slot 211, the position of one connecting portion away from the application release slot 211 can move relative to the first pole 23 or the second pole 24. Thus, when the first pole 23 and the second pole 24 are plugged and matched, the connecting portion can be deformed at this movable position; the position of the other connecting portion adjacent to the application release slot 211 can move relative to the corresponding first pole 23 or second pole 24. Thus, when the first pole 23 and the second pole 24 are plugged and matched, this movable position can extend into the application release slot 211 to release stress.

[0249] Specifically, please refer to Figure 24 , the elastic electrical connector 22 is arranged in the plugging slot 241. The connecting portion includes a first end 221 and a second end 222. The first end 221 of the second connecting portion 226 is connected to the second pole 24, and the second end 222 of the second connecting portion 226 is connected to be movable relative to the second pole 24. The second end 222 of the first connecting portion 225 can move relative to the second pole 24, and the second end 222 of the first connecting portion 225 can be connected to the second pole 24. When the first pole 23 and the second pole 24 are plugged and matched, the second end 222 of the second connecting portion 226 can deform the second connecting portion 226, and the second end 222 of the first connecting portion 225 can extend into the application release slot.

[0250] Optionally, in Figure 24 , the second pole 24 is further provided with an application release slot 211 adjacent to the second end 222 of the second connecting portion 226, and the second end 222 of the second connecting portion 226 can extend into the application release slot 211.

[0251] Please refer to Figure 29 , the elastic electrical connector 22 is arranged outside the plugging portion 231. The connecting portion includes a first end 221 and a second end 222. The first end 221 of the second connecting portion 226 is connected to the first pole 23, and the second end 222 of the second connecting portion 226 is connected to be movable relative to the first pole 23. The second end 222 of the first connecting portion 225 can move relative to the first pole 23, and the second end 222 of the first connecting portion 225 can be connected to the first pole 23. When the first pole 23 and the second pole 24 are plugged and matched, the second end 222 of the second connecting portion 226 can deform the second connecting portion 226, and the second end 222 of the first connecting portion 225 can extend into the application release slot.

[0252] Optionally, in Figure 29 , the first pole 23 is further provided with an application release slot 211 adjacent to the second end 222 of the second connecting portion 226, and the second end 222 of the second connecting portion 226 can extend into the application release slot 211.

[0253] According to some embodiments of the present application, optionally, the elastic electrical connector 22 is disposed in the insertion slot 241, and / or the elastic electrical connector 22 is disposed outside the insertion portion 231;

[0254] Optionally, please refer to Figures 13 to 28 , in one embodiment, the second pole 24 is provided with an insertion slot 241, and the elastic electrical connector 22 is disposed in the insertion slot 241. Optionally, in one embodiment, the first pole 23 is provided with an insertion slot 241, and the elastic electrical connector 22 is disposed in the insertion slot 241.

[0255] When the elastic electrical connector 22 is disposed in the insertion slot 241, during the transportation and storage of the battery cell 20, etc., the elastic electrical connector 22 is not easily damaged by external objects, thereby providing the service life of the elastic electrical connector 22 to a certain extent.

[0256] Optionally, please refer to Figure 29 , in one embodiment, the first pole 23 is provided with an insertion portion 231, and the elastic electrical connector 22 is disposed outside the insertion portion 231. Optionally, in one embodiment, the second pole 24 is provided with an insertion portion 231, and the elastic electrical connector 22 is disposed outside the insertion slot 241.

[0257] When the elastic electrical connector 22 is disposed outside the insertion portion 231, it is convenient to maintain the elastic electrical connector 22 (for example, replacement, repair, etc.).

[0258] Optionally, in one embodiment, one or more elastic electrical connectors 22 are disposed outside the insertion portion 231; another or more elastic electrical connectors 22 are disposed in the insertion slot 241.

[0259] According to some embodiments of the present application, optionally, the battery cell 20 includes a receiving groove 212, the receiving groove 212 is disposed on the first pole 23 or the second pole 24, the elastic electrical connector 22 includes an elastic portion 223, and the elastic portion 223 is located in the receiving groove 212 and connected to the side wall of the receiving groove 212.

[0260] Specifically, the elastic portion 223 connects the first end 221 and the second end 222. Optionally, in one embodiment, please refer to Figures 13 to 28 , the elastic electrical connector 22 is disposed in the insertion slot 241, and the elastic electrical connector 22 is disposed on the surface of the second pole 24 facing the insertion slot 241. The first end 221 of the elastic electrical connector 22 is fixedly connected to the surface of the second pole 24 facing the insertion slot 241, and the second end 222 can move relative to the connected second pole 24. The receiving groove 212 is disposed on the first pole 23. Specifically, the receiving groove 212 is disposed on the circumferential surface of the insertion portion 231. When two adjacent battery cells 20 are electrically connected, the elastic portion 223 is located in the receiving groove 212 and connected to the side wall of the receiving groove 212.

[0261] Optionally, in one embodiment, please refer to Figure 29 , an elastic electrical connector 22 is provided outside the insertion portion 231. One end of the elastic electrical connector 22 is fixedly connected to the insertion portion 231, and the second end 222 is movable relative to the first pole 23 to which it is connected. A receiving groove 212 is provided on the second pole 24, specifically, the receiving groove 212 is provided on the circumferential surface of the second pole 24 facing the insertion groove 241. When two adjacent battery cells 20 are electrically connected, the elastic portion 223 is located in the receiving groove 212 and is connected to the side wall of the receiving groove 212.

[0262] Please refer to Figures 21 to 28 , when the first pole 23 and the second pole 24 are assembled, the elastic electrical connector 22 is deformed by the extrusion of the first pole 23 and the second pole 24, and the elastic portion 223 is flattened. When the first pole 23 and the second pole 24 are assembled in place, the elastic portion 223 rebounds into the receiving groove 212 and is connected to the mating part, so as to be in full contact with the mating part (the second pole 24 or the insertion portion 231).

[0263] According to some embodiments of the present application, optionally, the receiving groove 212 extends and is provided on the corresponding first pole 23 or second pole 24.

[0264] Optionally, in one embodiment, please refer to Figure 13 and Figure 14 , the receiving groove 212 can extend and be provided on the circumferential surface of the insertion portion 231 of the first pole 23, so as to be adapted to the elastic portion 223 provided on the circumferential surface of the second pole 24 facing the insertion groove 241. Optionally, in one embodiment, please refer to Figure 29 , the receiving groove 212 can extend and be provided on the circumferential surface of the second pole 24 facing the insertion groove 241, so as to be adapted to the elastic portion 223 provided on the circumferential surface of the insertion portion 231.

[0265] In the above embodiment, the receiving groove 212 extends and is provided on the corresponding first pole 23 or second pole 24, so that the receiving groove 212 can be adapted to the elastic portion 223 in position, and the elastic portion 223 can be in full contact with the mating part.

[0266] The shape of the receiving groove 212 includes but is not limited to regular or irregular shapes such as rectangular and arc-shaped. The shape of the receiving groove 212 can be adapted to the shape of the elastic portion 223. In Figure 20 and Figure 24 , the elastic portion 223 is substantially arc-shaped, and the receiving groove 212 is substantially arc-shaped.

[0267] According to some embodiments of the present application, optionally, the first terminal 23 or the second terminal 24 includes a terminal body 213 and an electrical connection post 214. The electrical connection post 214 is connected to the terminal body 213, and an elastic electrical connector 22 is provided on the electrical connection post 214. One end of the electrical connection post 214 facing away from the terminal body 213 is configured to be pluggable into the second terminal 24 or the first terminal 23 of another adjacent battery cell 20.

[0268] Specifically, for the convenience of description and in combination with Figures 30 to 33 , this embodiment and subsequent embodiments will be described by taking the first terminal 23 including a terminal body 213 and an electrical connection post 214 as an example.

[0269] The elastic electrical connector 22 can abut against the electrical connection post 214 and the second terminal 24, so that the first terminal 23 and the second terminal 24 of two adjacent battery cells 20 form an electrical connection. The electrical connection post 214 matches the terminal body 213 in shape and size. For example, the terminal body 213 is in a long strip shape, and the electrical connection post 214 is a long strip columnar structure matching the size of the terminal body 213.

[0270] Optionally, the electrical connection post 214 can also be a short and thick column or other composite structures. Optionally, the electrical connection post 214 can be cylindrical, prismatic or other shapes, and the present application does not limit this.

[0271] Optionally, the electrical connection post 214 and the terminal body 213 are of a split structure. Optionally, please refer to Figure 32 and Figure 33 , plugging grooves 241 are formed at both ends of the electrical connection post 214. Optionally, please refer to Figure 30 and Figure 31 , plugging portions 231 are formed at both ends of the electrical connection post 214. Optionally, one end of the two ends of the electrical connection post 214 is formed with a plugging groove 241, and the other end is formed with a plugging portion 231. Plugging grooves 241 matching the plugging portions 231 of the electrical connection post 214 are formed on the second terminal 24, as shown in Figure 30 and Figure 31 , or plugging portions 231 matching the plugging grooves 241 of the electrical connection post 214, as shown in Figure 32 and Figure 33 .

[0272] Optionally, the terminal bodies 213 of two adjacent battery cells 20 along the first direction are arranged opposite to the second terminal 24 along the first direction. A plurality of battery cells 20 are sequentially connected along the first direction through a plurality of electrical connection posts 214 and the second terminal 24.

[0273] In the above embodiments, one end of the electrical connection post 214 facing away from the post body 213 is configured to be plugged into the second post 24 of another adjacent battery cell 20, realizing the electrical connection of the two battery cells 20. This replaces the connection method of welding the tab to the post of the adjacent battery cell 20 to achieve the electrical connection of the battery cell 20, thereby improving defects such as poor soldering and blasting holes caused by welding the tab to the post, and thus improving the reliability of the electrical connection between the battery cells 20. On the other hand, by connecting the post body 213 and the second post 24 of the adjacent battery cell 20 through the electrical connection post 214, compared with the direct plugging of the post bodies 213 of the adjacent battery cells 20, not only can the shape of each post body 213 be unified and standardized to ensure the manufacturing efficiency of the post body 213, but also it is convenient to adjust the distance between the adjacent battery cells 20 through the intermediate electrical connection post 214 to adapt to the expansion of the battery cell 20, further improving the reliability of the electrical connection between the battery cells 20.

[0274] According to some embodiments of the present application, optionally, the post body 213 and the second post 24 are both formed with plugging grooves 241; two plugging portions 231 are respectively formed at both ends of the electrical connection post 214, and one of the two plugging portions 231 is plugged into the plugging groove 241 of the post body 213, and the other of the two plugging portions 231 is plugged into the plugging groove 241 of the second post 24 of the adjacent battery cell 20.

[0275] Optionally, the post body 213 can be formed with plugging grooves 241 having a circular, elliptical, triangular, square, polygonal, racetrack-shaped or other regular or irregular cross-sectional shapes. Optionally, the cross-sectional shape of the plugging portion 231 is circular, elliptical, triangular, square, polygonal, racetrack-shaped or other regular or irregular shapes adapted to the plugging groove 241.

[0276] Optionally, the post body 213 extends along the length direction of the battery cell 20 to form a strip shape, and the length direction of the battery cell 20 can be Figure 3 the left-right direction as shown. The electrical connection post 214 is a column body having a length close to that of the post body 213. Further, both the plugging groove 241 and the plugging portion 231 extend along the length direction of the post body 213 to form strip shapes. Such a setting increases the connection area, especially facilitating the dispersion of stress in the length direction on the side of the battery cell 20 and ensuring the structural stability of the connection between the post body 213 and the electrical connection post 214.

[0277] Optionally, please refer to Figure 30, the insertion slot 241 includes a slot bottom surface 2411 and an inner slot peripheral surface 2412. The slot bottom surface 2411 is the deepest part of the insertion slot 241 along the recessed direction, and the inner slot peripheral surface 2412 can connect the slot bottom surface 2411 to the surface of the battery cell 20 or the end face of the pole assembly 21. Further, the insertion slot 241 is recessed along the direction of the housing 25 in the first direction, and the inner slot peripheral surface 2412 surrounds the insertion portion 231 in the up-down direction and the left-right direction.

[0278] Optionally, the insertion portion 231 is a convex structure adapted to the insertion slot 241. The insertion portion 231 is inserted into the insertion slot 241, and the top end of the insertion portion 231 in the first direction is received in the insertion slot 241. The end face of the insertion portion 231 can abut against the slot bottom surface 2411. On the one hand, the elastic electrical connector 22 can abut against the peripheral wall of the insertion portion 231 and the inner slot peripheral surface 2412 of the second pole 24, so that the first pole 23 and the second pole 24 are electrically connected. On the other hand, the elastic electrical connector 22 can abut against the peripheral wall of the insertion portion 231 and the inner slot peripheral surface 2412 of the pole body 213, so that the pole body 213 and the electrical connection column 214 are electrically connected.

[0279] In the embodiment of the present application, the electrical connection between the pole body 213, the electrical connection column 214 and the second pole 24 is realized by inserting the insertion portion 231 into the insertion slot 241. The operation is relatively simple and the connection is relatively stable. At the same time, the two battery cells 20 that have completed the electrical connection can be exempted from welding cooperation, thereby avoiding the problem that the electrode assembly 26 is easily damaged when the welding position of the pole assembly 21 is disassembled.

[0280] According to some embodiments of the present application, optionally, please combine Figure 30 , both the pole body 213 and the second pole 24 protrude from the side wall of the housing 25 where they are located, and the protruding parts of the pole body 213 and the second pole 24 are recessed toward the direction close to the side wall of the housing 25 to respectively form the insertion slot 241; or, please combine Figure 31 , both the pole body 213 and the second pole 24 are recessed inward relative to the side wall of the housing 25 where they are located to directly form the insertion slot 241.

[0281] Optionally, please combine Figure 30 , in one embodiment, the insertion slot 241 of the pole body 213 is recessed from the end face of the pole body 213 away from the housing 25 toward the direction close to the housing 25, and the insertion slot 241 of the second pole 24 is recessed from the end face of the second pole 24 away from the housing 25 toward the direction close to the housing 25.

[0282] Please combine Figure 4, both the pole column body 213 and the second pole column 24 protrude from the side wall (the first side wall 251) of the respective housing 25 they are located in. For the convenience of description, the inner and outer sides of the battery cell 20 are distinguished by the first side wall 251 where the pole column body 213 and the second pole column 24 are respectively located. In the same battery cell 20, the interval where the two first side walls 251 face each other is located inside the battery cell 20, and the interval where the two first side walls 251 face away from each other is located outside the battery cell 20.

[0283] Optionally, in one example, both the pole column body 213 and the second pole column 24 protrude from the respective first side wall 251 they are located in, and at least part of both the pole column body 213 and the second pole column 24 is located outside the battery cell 20. The bottom surface 2411 of the insertion slot 241 can be located inside the battery cell 20, and part of the inner peripheral surface 2412 of the insertion slot 241 is located inside the battery cell 20 and part is located outside the battery cell 20. The bottom surface 2411 can also be located outside the battery cell 20, then the entire inner peripheral surface 2412 is located outside the battery cell 20, as Figure 30 shown.

[0284] In the above embodiment, both the pole column body 213 and the second pole column 24 protrude from the side wall (such as the first side wall 251) of the respective housing 25, thereby reducing the influence of the damage of the pole column assembly 21 on the structures such as the electrode assembly 26 inside the battery cell 20. In addition, it is convenient for forming and assembling in the case where the first pole column 23 and the second pole column 24 are integrally formed with the battery cell 20.

[0285] Optionally, in another example, please refer to Figure 31 , both the pole column body 213 and the second pole column 24 are recessed inward relative to the side wall of the respective housing 25 to directly form the insertion slot 241, and both the bottom surface 2411 and the inner peripheral surface 2412 of the insertion slot 241 are located inside the battery cell 20.

[0286] In the above embodiment, the pole column body 213 and the second pole column 24 are recessed from the side wall (such as the first side wall 251) of the respective housing into the housing 25 to form the insertion slot 241, so that the electrical connection column 214 is directly inserted into the inner side of the surface of the battery cell 20, and the pole column assembly 21 is not easily deformed under conditions such as collision, extrusion, and pulling, and the insertion structure between the insertion slot 241 and the electrical connection column 214 is relatively stable.

[0287] According to some embodiments of the present application, optionally, please refer to Figure 32 and Figure 33, both the pole column body 213 and the second pole column 24 are provided with insertion parts 231, and insertion slots 241 are respectively formed at both ends of the electrical connection column 214; one of the two insertion slots 241 is inserted into the insertion part 231 of the pole column body 213, and the other of the two insertion slots 241 is configured to be inserted into the insertion part 231 of the second pole column 24 of the adjacent battery cell 20.

[0288] The elastic electrical connection member 22 can abut against the peripheral wall of the insertion part 231 of the second pole column 24 and the inner peripheral surface 2412 of the slot of the electrical connection column 214, so as to electrically connect the first pole column 23 and the second pole column 24. On the other hand, the elastic electrical connection member 22 can abut against the peripheral wall of the insertion part 231 of the pole column body 213 and the inner peripheral surface 2412 of the slot of the electrical connection column 214, so as to electrically connect the pole column body 213 and the electrical connection column 214.

[0289] Optionally, the pole column body 213 has a first base 232, the second pole column 24 has a second base 242, the insertion part 231 on the pole column body 213 protrudes relative to the first base 232, and the insertion part 231 on the second pole column protrudes relative to the second base 242. The insertion slot 241 is a groove adapted to the insertion part 231, and the insertion slot 241 is recessed into the electrical connection column 214 from the end face of the electrical connection column 214. The top end of the protruding insertion part 231 is received in the insertion slot 241, and its end face can abut against the bottom wall of the recessed insertion slot 241. Optionally, the first direction is the front-back direction, the insertion part 231 protrudes along the first direction, and the insertion slot 241 is recessed along the first direction.

[0290] Optionally, the electrical connection column 214 has a long strip prism structure, the insertion slot 241 extends along the length direction of the electrical connection column 214 to form a long strip square slot, and the insertion part 231 forms a long strip protrusion matching the size of the insertion slot 241.

[0291] In the above embodiment, the electrical connection between the pole column body 213, the electrical connection column 214 and the second pole column 24 is realized by inserting the insertion part 231 into the insertion slot 241. The operation is relatively simple and the connection is relatively stable. At the same time, the two battery cells 20 that have completed the electrical connection can be exempted from welding cooperation, thereby avoiding the problem that the electrode assembly 26 is easily damaged when the welding position of the pole column assembly 21 is disassembled.

[0292] According to some embodiments of the present application, optionally, please combine Figure 32 , both the pole column body 213 and the second pole column 24 protrude from the side wall of the respective housing 25 where they are located to directly form the insertion part 231; or, please combine Figure 33 , both the pole column body 213 and the second pole column 24 are recessed relative to the side wall of the respective housing 25 where they are located, and an insertion part 231 smaller than the recessed size protrudes at the recessed position.

[0293] Please combineFigure 4 The pole column body 213 and the second pole column 24 both protrude from the side wall of their respective housing 25, which is the first side wall 251.

[0294] In one example, please refer to Figure 32 The pole column body 213 and the second pole column 24 protrude outward from the first side wall 251 where they are located toward the outside of the battery cell 20. The part protruding from the first side wall 251 forms a plug-in part 231, and the plug-in part 231 is located outside the battery cell 20.

[0295] In the embodiment of the present application, the pole column body 213 and the second pole column 24 protrude from the first side wall 251 where they are located, thereby reducing the influence of the damage of the pole column assembly 21 on the structures such as the electrode assembly 26 inside the battery cell 20. In addition, it is convenient for molding and assembly in the case where the pole column assembly 21 and the battery cell 20 are integrally formed.

[0296] In another example, please refer to Figure 33 The pole column body 213 and the second pole column 24 are recessed from the first side wall 251 where they are located toward the inside of the housing 25. The bottom walls of the pole column body 213 and the second pole column 24 after recessing protrude in a direction away from the housing 25 to form a plug-in part 231. The protruding depth of the plug-in part 231 is less than or equal to the recessing depth of the pole column body 213 and the second pole column 24. The plug-in part 231 is located inside the battery cell 20 and is arranged in the recessed area formed by the pole column body 213 and the second pole column 24. The electrical connection column 214 can be partially inserted into the recessed area of the pole column body 213 and the second pole column 24 and is plugged with the plug-in part 231 inside the battery cell 20 to accommodate the plug-in part 231 in the plug-in slot 241.

[0297] In the above embodiment, the pole column body 213 and the second pole column 24 are recessed from the side wall of their respective housing toward the inside of the housing 25, so that the electrical connection column 214 is directly inserted into the inside of the surface of the battery cell 20, and the plug-in part 231 and the plug-in slot 241 are plugged inside the surface of the battery cell 20, thereby reducing external interference and improving the connection reliability between the electrical connection column 214 and the battery cell 20.

[0298] In a second aspect, the present application provides a battery device. A battery device includes a plurality of battery cells 20 according to any one of the above embodiments. The plurality of battery cells 20 are stacked and arranged in a first direction, and the plug-in part 231 of an adjacent battery cell 20 is electrically connected to the plug-in slot 241 of another battery cell 20 through an elastic electrical connector 22.

[0299] The elastic electrical connector 22 is configured such that when one battery cell 20 is electrically connected to another adjacent battery cell 20, it can elastically abut between the insertion portion 231 of one battery cell 20 and the insertion slot 241 of another adjacent battery cell 20 to achieve the electrical connection between two adjacent battery cells 20. Thus, the elastic electrical connector 22 can realize the electrical connection between two battery cells 20. The elastic electrical connector 22 can keep the two pole assemblies 21 in full contact under static and dynamic conditions such as vibration and shock, thereby improving to a certain extent the electrical contact area between two adjacent battery cells 20, reducing the overcurrent impedance and heat generation, enhancing the electrical connection reliability between two adjacent battery cells 20, and reducing or avoiding safety problems.

[0300] Optionally, in Figure 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. A plurality of battery cells 20 are arranged in a row along the first direction, and each row of battery cells 20 forms a battery pack 50. A plurality of battery packs 50 are arranged along the third direction. In the first direction, the two pole assemblies 21 of two adjacent battery cells 20 are connected to achieve the electrical connection within one battery pack 50. Optionally, in the same battery pack 50, two adjacent battery cells 20 are connected in series.

[0301] Optionally, in Figure 3 , the battery device 100 includes four battery packs 50, and the four battery packs 50 are arranged in a 2×2 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, parallel, or in a hybrid connection.

[0302] In Figure 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 provided on the front side plate of the second part 12. The explosion - proof valve 30 is used to discharge the high - pressure gas in the box body 10. The battery management system 31 and the high - voltage box 32 are provided 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.

[0303] According to some embodiments of the present application, optionally, the battery device 100 includes a conductive adhesive 40. The conductive adhesive 40 is located in the insertion slot 241 and connects the insertion portion 231 and the first pole 23 or the second pole 24.

[0304] Optionally, referring to Figures 13 to 29 , in one embodiment, the second pole 24 is provided with an insertion slot 241, the first pole 23 is provided with an insertion portion 231, and the conductive adhesive 40 is located in the insertion slot 241 and connects the insertion portion 231 and the second pole 24.

[0305] In one embodiment, the first terminal post 23 is provided with a socket groove 241, the second terminal post 24 is provided with a socket portion 231, and the conductive adhesive 40 is located in the socket groove 241 and connects the socket portion 241 and the first terminal post 23.

[0306] In the above embodiment, the conductive adhesive 40 connects the socket portion 231 and the second terminal post 24, thereby increasing the current-carrying contact surface between the first terminal post 23 and the second terminal post 24 and improving the conductivity.

[0307] Optionally, the conductive adhesive 40 can be applied or poured before the assembly of the first terminal post 23 and the second terminal post 24 to fill the cavity gap after assembly.

[0308] According to some embodiments of the present application, optionally, the socket portion 231 includes a first end face 233 in a first direction, the first end face 233 is located in the socket groove 241, the first terminal post 23 or the second terminal post 24 includes a second end face 246 facing the socket groove 241 in the first direction, the conductive adhesive 40 connects the first end face 233 and the second end face 246, and the elastic electrical connector 22 connects the circumferential surface of the first terminal post 23 or the second terminal post 24 facing the socket groove 241 and the circumferential surface of the socket portion 231.

[0309] Please refer to Figure 3 and Figure 20 , the first direction is the front-back direction. The first end face 233 of the socket portion 231 in the first direction is the front end face of the socket portion 231, and the second end face 246 is the rear end face of the second terminal post 24 facing the socket groove 241. The conductive adhesive 40 connects the front end face of the socket portion 231 and the rear end face of the second terminal post 24 facing the socket portion 231, so that the socket portion 231 and the second terminal post 24 can be connected at least at two end faces.

[0310] Optionally, please refer to Figure 20 , the elastic electrical connector 22 connects the circumferential surface of the second terminal post 24 facing the socket groove 241 and the circumferential surface of the socket portion 231. In the first direction, the conductive adhesive 40 connects the first end face 233 of the socket portion 231 and the second end face 246 of the second terminal post 24 facing the socket groove 241, so that the first terminal post 23 and the second terminal post 24 can be connected in both the circumferential direction and the first direction of the terminal post assembly 21, so that the first terminal post 23 and the second terminal post 24 are in full contact.

[0311] In one embodiment, the elastic electrical connector 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 face 233 of the insertion portion 231 and the second end face 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 the circumferential direction and the first direction of the pole assembly 21, so that the first pole 23 and the second pole 24 are in full contact.

[0312] Further, when the battery device 100 is used for a long time, the expansion force of the battery cell 20 acts along the assembly direction of the pole assembly 21, which can also make the contact surface of the conductive adhesive 40 with the insertion portion 231 and the second pole 24 in full contact.

[0313] 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.

[0314] Please refer to Figures 13 to 29 , the second pole 24 is provided with an insertion slot 241, the first pole 23 is provided with an insertion portion 231, and the insertion portion 231 is inserted into the insertion slot 241. Except for the position connected by the elastic electrical connector 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, and a pre-tightening force is formed between the insertion portion 231 and the second pole 24, so that the contact between the insertion portion 231 and the second pole 24 is more sufficient.

[0315] The first pole 23 is provided with an insertion slot 241, the second pole 24 is provided with an insertion portion 231, the insertion portion 231 is inserted into the insertion slot 241, and the contact between the insertion portion 231 and the surface of the first pole 23 facing the insertion slot 241 can be a hard contact, forming an interference fit, and a pre-tightening force is formed between the insertion portion 231 and the first pole 23, so that the contact between the insertion portion 231 and the first pole 23 is more sufficient.

[0316] Optionally, in one embodiment, in the first direction, the conductive adhesive 40 connects the first end face 233 of the insertion portion 231 and the second end face 246 of the second pole 24 facing the insertion slot 241. When the battery device 100 is used for a long time, the pre-tightening force of the battery cell 20 assembly can make the contact surface of the conductive adhesive 40 with the insertion portion 231 and the second pole 24 in full contact.

[0317] It can be understood that the interference amount of the fit between the insertion portion 231 and the insertion slot 241 can be set according to specific requirements.

[0318] According to some embodiments of the present application, optionally, please refer to Figures 34 to 35, the battery device 20 includes a sampling member 41. In the first direction, the first pole 23 of an adjacent battery cell 20 is inserted into the second pole 24 of another battery cell 20, and the sampling member 41 is in direct contact with the first pole 23 and / or the second pole 24 to collect the parameter information of the adjacent corresponding battery cell 20.

[0319] Specifically, in one embodiment, the sampling member 41 is in direct contact with the first pole 23 to collect the parameter information of the battery cell 20 corresponding to the first pole 23. In one embodiment, the sampling member 41 is in direct contact with the second pole 24 to collect the parameter information of the battery cell 20 corresponding to the second pole 24. In one embodiment, the sampling member 41 is in direct contact with the first pole 23 and the second pole 24 to collect the parameter information of two adjacent battery cells 20.

[0320] The parameter information includes, but is not limited to, the voltage and temperature information of the battery cell 20.

[0321] In the above embodiment, by directly contacting the first pole 23 and / or the second pole 24 with the sampling member 41 to collect the parameter information of the corresponding battery cell 20, it can be adapted to battery devices 100 such as the design without a tab structure and the design with a tab structure where a sampling structure cannot be set, which can improve the adaptability of the sampling method to the battery device 100; at the same time, directly collecting the information of the pole assembly 21 can also ensure the accuracy and reliability of the parameter information of the battery cell 20.

[0322] According to some embodiments of the present application, optionally, the contact method between the sampling member 41 and the pole assembly 21 includes at least one of the following:

[0323] The sampling member 41 is in direct contact with at least one of the first pole 23 and the second pole 24 in the axial direction of the pole assembly 21;

[0324] The sampling member 41 is in direct contact with at least one of the first pole 23 and the second pole 24 in the circumferential direction of the pole assembly 21;

[0325] The sampling member 41 is in direct contact with at least one of the first pole 23 and the second pole 24 in the radial direction of the pole assembly 21.

[0326] In Figures 34 to 35Among them, the first direction is the front - back direction. The circumferential direction of the pole assembly 21 is the direction around the axial direction L of the pole assembly 21, and the radial direction D of the pole assembly 21 can be perpendicular to the axial direction L of the pole assembly 21. The first direction can be parallel to the axial direction L of the pole assembly 21, or the first direction can coincide with the axial direction L of the pole assembly 21. In the first direction, the electrical connection mode between two adjacent battery cells 20 can be series connection or parallel connection. When the electrical connection mode between two adjacent battery cells 20 is series connection, the two connected pole assemblies 21 are opposite - polarity pole assemblies 21, that is, one is a positive - pole assembly 21 and the other is a negative - pole assembly 21. When the electrical connection mode between two adjacent battery cells 20 is parallel connection, the two connected pole assemblies 21 are same - polarity pole assemblies 21, that is, both are positive - pole assemblies 21 or both are negative - pole assemblies 21.

[0327] Optionally, multiple battery cells 20 can be arranged in a row along the first direction, and multiple rows of battery cells 20 are arranged along the third direction, and the first direction is perpendicular to the third direction. In the first direction, the two pole assemblies 21 of two adjacent battery cells 20 are connected, so that the two adjacent battery cells 20 are electrically connected. In Figure 3 Among them, the first direction is the front - back direction, the second direction is the up - down direction, and the third direction is the left - right direction.

[0328] Optionally, the sampling component 41 can be a voltage sampling component 41 of the battery cell 20, and can sample the voltage information of the battery cell 20.

[0329] The sampling component 41 is a contact - type sampling component 41. The contact mode between the sampling component 41 and the pole assembly 21 includes at least one of the following:

[0330] The sampling component 41 directly contacts at least one of the first pole 23 and the second pole 24 in the axial direction L of the pole assembly 21 (hereinafter referred to as contact mode one);

[0331] The sampling component 41 directly contacts at least one of the first pole 23 and the second pole 24 in the circumferential direction of the pole assembly 21 (hereinafter referred to as contact mode two);

[0332] The sampling component 41 directly contacts at least one of the first pole 23 and the second pole 24 in the radial direction D of the pole assembly 21 (hereinafter referred to as contact mode three).

[0333] In one embodiment, the contact mode between the sampling member 41 and the pole column assembly 21 is contact mode one. In contact mode one, the sampling member 41 can directly contact one of the pole columns in the axial direction L of the pole column assembly 21, or can directly contact the first pole column 23 and the second pole column 24. Contact mode one can be applicable to the scenario of installing the sampling member 41 where there is less space in the circumferential and radial directions D of the pole column assembly 21 and more space in the axial direction L of the pole column assembly 21, including but not limited to this scenario.

[0334] In one embodiment, the contact mode between the sampling member 41 and the pole column assembly 21 is contact mode two. In contact mode two, the sampling member 41 can directly contact one of the first pole column 23 and the second pole column 24 in the circumferential direction of the pole column assembly 21, or can directly contact the first pole column 23 and the second pole column 24. Contact mode two can be applicable to the scenario of installing the sampling member 41 where there is less space in the axial direction L and the radial direction D of the pole column assembly 21 and more space in the circumferential direction of the pole column assembly 21, including but not limited to this scenario.

[0335] In one embodiment, the contact mode between the sampling member 41 and the pole column assembly 21 is contact mode three. In contact mode three, the sampling member 41 can directly contact one of the first pole column 23 and the second pole column 24 in the radial direction D of the pole column assembly 21, or can contact the first pole column 23 and the second pole column 24. Contact mode three can be applicable to the scenario of installing the sampling member 41 where there is less space in the circumferential direction and the axial direction L of the pole column assembly 21 and more space in the radial direction D of the pole column assembly 21, including but not limited to this scenario.

[0336] In one embodiment, the contact mode between the sampling member 41 and the pole column assembly 21 includes contact mode one and two. Optionally, the sampling member 41 can directly contact one of the first pole column 23 and the second pole column 24 in the axial direction L of the pole column assembly 21, and contact the other of the first pole column 23 and the second pole column 24 in the circumferential direction of the pole column assembly 21. Optionally, the sampling member 41 can directly contact one of the first pole column 23 and the second pole column 24 in the axial direction L and the circumferential direction of the pole column assembly 21, and directly contact the other of the first pole column 23 and the second pole column 24 in the circumferential direction and the axial direction L of the pole column assembly 21. Optionally, the sampling member 41 can directly contact one of the first pole column 23 and the second pole column 24 in the axial direction L of the pole column assembly 21, and directly contact the other of the first pole column 23 and the second pole column 24 in the axial direction L and the circumferential direction of the pole column assembly 21.

[0337] In one embodiment, the contact modes between the sampling member 41 and the pole assembly 21 include contact mode one and three. Optionally, 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. Optionally, 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 of the pole assembly 21. Optionally, 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.

[0338] In one embodiment, the contact modes between the sampling member 41 and the pole assembly 21 include contact mode two and three. Optionally, 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. Optionally, 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. Optionally, 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.

[0339] In one embodiment, the contact modes between the sampling member 41 and the pole assembly 21 are contact mode one, two and three. For the specific explanations of the contact modes, reference can be made to the above explanations. To avoid redundancy, no detailed elaboration will be made here.

[0340] 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, so as to realize the electrical connection between the sampling member 41 and the pole assembly 21, thereby providing a flexible sampling connection scheme for different connection modes of the pole assembly 21. The arrangement of the sampling member 41 is more flexible, and to a certain extent, alleviates the limitation of the space of the battery device 100 on the sampling member 41.

[0341] Optionally, the material of the sampling piece 41 includes but is not limited to nickel, copper, etc. Optionally, the battery cell 20 includes an insulating piece 43, and the insulating piece 43 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, plug-in, snap-on, etc. The two pole assemblies 21 are connected by plug-in, that is, they are connected by convex-concave fit. Optionally, the sampling piece 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.

[0342] According to some embodiments of the present application, optionally, multiple battery cells 20 are connected in series. Optionally, in some embodiments, multiple battery cells 20 are connected in parallel. Optionally, in some embodiments, multiple battery cells 20 are connected in both series and parallel.

[0343] In the above-mentioned embodiment, various connection modes can be realized inside the battery device 100, thereby completing a more complex functional design.

[0344] In the first direction, the electrical connection mode of two adjacent battery cells 20 can be a series connection or a parallel connection. When the electrical connection mode of two adjacent battery cells 20 is a series connection, the two connected pole assemblies 21 are opposite pole assemblies 21, that is, one is a positive pole assembly and the other is a negative pole assembly. When the electrical connection mode of two adjacent battery cells 20 is a parallel connection, the two connected pole assemblies 21 are the same pole assemblies 21, that is, both are positive pole assemblies or both are negative pole assemblies.

[0345] Optionally, refer to Figure 34 and Figure 35 The housing 25 is formed with a receiving groove 257, and the receiving groove 257 is located on one surface of the battery cell 20 along the first direction (such as Figure 35 The receiving groove 257 is recessed toward the inside of the battery cell 20 relative to the surface of the battery cell 20 where the receiving groove 257 is located, and the receiving groove 257 is used to receive the pole 21. The first pole 23 and the second pole 24 of two battery cells 20 adjacent to each other in the first direction are plugged into the receiving groove 257. The receiving groove 257 may be located at the end of the housing 251. For example, the first wall 251 is rectangular, and the receiving groove 257 is formed at the corner of the rear first wall 251.

[0346] The receiving groove 257 is recessed on the surface of the battery cell 20 and is used to receive the pole post 21. Thus, when two adjacent battery cells 20 are connected, the first pole post 23, the second pole post 24, and the sampling member 30 can be received in the receiving groove 257, which can shorten the distance between two adjacent battery cells 20 in the first direction. Furthermore, it is beneficial to arrange more battery cells 20 in the limited volume space of the battery device 100, thereby improving the energy density of the battery device 100. The first pole post 23 and the second pole post 24 connected in the receiving groove 257 can be of the same polarity or of different polarities.

[0347] Optionally, referring to Figure 34 and Figure 35 , the battery cell 20 is generally in the shape of a flat cuboid, and the length dimension of the battery cell 20 is much larger than the width dimension and the thickness dimension of the battery cell 20. The pole post 21 can extend in a strip shape along the width direction of the battery cell 20 and is arranged close to the end in the length direction of the battery cell 20. In this embodiment, the length dimension of the pole post 21 is relatively small, and the pole post 21 is a short and flat rectangular structure.

[0348] In a third aspect, the present application provides an electrical device. The electrical device includes the battery cell 20 of any one of the above embodiments, and the battery cell 20 is used to provide electrical energy, or; it includes the battery device 100 of any one of the above embodiments, and the battery device 100 is used to provide electrical energy.

[0349] The electrical device can be any of the foregoing devices or systems that apply the battery device 100. In some embodiments, the electrical device can include one or more battery cells 20. In some embodiments, the electrical device can include one or more battery devices 100.

[0350] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some 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 all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features 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 that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing; A terminal assembly provided on the housing, the terminal assembly including a first terminal and a second terminal with opposite polarities, one of the first terminal and the second terminal being provided with a plugging portion, and the other being provided with a plugging slot adapted in size to the plugging portion, the plugging portion being configured such that when one battery cell is electrically connected to an adjacent other battery cell, it can at least partially insert into the plugging slot of the other battery cell; An elastic electrical connecting member provided on at least one of the plugging portion and the plugging slot, and configured such that when one battery cell is electrically connected to an adjacent other battery cell, it can elastically abut between the plugging portion of one battery cell and the plugging slot of another adjacent battery cell to achieve electrical connection between two adjacent battery cells.

2. The battery cell according to claim 1, wherein, The elastic electrical connecting member extends and is distributed along the length extension direction of the corresponding first terminal or second terminal.

3. The battery cell according to claim 2, characterized in that, The elastic electrical connecting member includes a plurality of elastic connecting portions, and the plurality of elastic connecting portions are spaced along the length extension direction of the corresponding first terminal or second terminal; Or, The elastic electrical connecting member includes one elastic connecting portion, and one elastic connecting portion extends continuously along the length extension direction.

4. The battery cell according to claim 3, wherein The elastic connecting portion includes a plurality of connecting portions, and the plurality of connecting portions are spaced along the plugging direction of the first terminal and the second terminal.

5. The battery cell according to claim 4, wherein The elastic connecting portion includes two connecting portions, namely a first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are spaced along the plugging direction of the corresponding first terminal and second terminal.

6. The battery cell according to claim 4, characterized in that, Along the plugging direction of the first terminal and the second terminal, the first terminal or the second terminal provided with the elastic connecting portion is provided with a stress relief groove at a position between any two adjacent connecting portions. When the first terminal and the second terminal are plugged together, the elastic electrical connecting member deforms and can partially extend into the stress relief groove.

7. The battery cell according to claim 6, characterized in that, Among two adjacent connecting portions on both sides of the same stress relief groove, one connecting portion is connected to the corresponding first terminal or second terminal at a position adjacent to the stress relief groove, and can move relative to the first terminal or the second terminal at a position away from the stress relief groove, and the other connecting portion can move relative to the corresponding first terminal or second terminal at a position adjacent to the stress relief groove, and is connected to the first terminal or the second terminal at a position away from the stress relief groove.

8. The battery cell according to any one of claims 1 to 7, characterized in that, The elastic electrical connecting member is provided in the plugging slot, and / or the elastic electrical connecting member is provided outside the plugging portion.

9. The battery cell according to claim 1, wherein, The battery cell includes a receiving groove provided on the first terminal or the second terminal, the elastic electrical connecting member includes an elastic portion, and the elastic portion is located in the receiving groove and is connected to the side wall of the receiving groove.

10. The battery cell according to claim 9, characterized in that, The receiving groove extends and is provided on the corresponding first terminal or second terminal.

11. The battery cell according to any one of claims 1 to 10, characterized in that, The housing has two first side walls facing away from each other, the area of the first side walls being larger than that of the other side walls. The two first side walls are arranged facing away from each other in a first direction, and the first pole and the second pole are respectively provided on the first side walls or on the same first side wall.

12. The battery cell according to claim 11, wherein, The first pole is provided with the insertion part, the insertion part protruding from the first side wall where the first pole is located, and the insertion slot being concave with respect to the first side wall where the second pole is located.

13. The battery cell according to claim 11, wherein, The first pole is provided with the insertion part, the insertion part protruding from the first side wall where the first pole is located, the second pole protruding from the first side wall where it is located, and an insertion slot being formed at the protruding end of the second pole. The insertion slot is recessed in the direction towards the first side wall with respect to the end of the second pole, and the depth of the recess of the insertion slot is less than or equal to the height of the second pole protruding 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 facing the second pole of another battery cell adjacent in the first direction along the first direction, and the battery cell is configured such that at least a part of the insertion part is inserted into the insertion slot of another battery cell adjacent in the first direction.

15. The battery cell according to claim 12, characterized in that, The battery cell includes an electrode assembly, the electrode assembly being disposed inside the housing. The electrode assembly includes a main body portion and a pole ear portion connected to the end of the main body portion. The first side wall includes a first region covering the main body portion and a second region covering the pole ear portion. 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 pole ear portion.

16. The battery cell according to claim 15, characterized in that, The main body portion includes wound or stacked pole pieces, the pole pieces being coated with an active material layer to generate electric energy, and the region of the pole pieces coated with the active material layer being facing the first region in the first direction.

17. The battery cell according to claim 15, wherein, The first side wall is square, the first side wall having two short sides opposite to each other in a second direction and two long sides opposite to each other 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 pairwise. The second region is disposed close to one of the short sides and the long sides, and the first pole and the second pole extend along the length direction of the short side or the long side close to the second region and are strip-shaped.

18. The battery cell according to claim 11, wherein, The battery cell includes a pressure relief mechanism, the pressure relief mechanism being disposed on a surface of the housing different from the first side wall, and the pressure relief mechanism being configured to crack prior to the housing when the internal pressure of the battery cell exceeds a pressure threshold.

19. The battery cell according to any one of claims 1-9, characterized in that, The housing is provided with a mounting hole, and the entire pole assembly is covered outside the mounting hole; or, a part of the pole assembly is covered outside the mounting hole, and a part of the pole assembly passes through the mounting hole and extends into the housing to cooperate with the housing.

20. The battery cell according to claim 19, characterized in that, The housing includes a housing body and a cover body, the housing body having an opening, and the cover body sealingly covering the opening; the pole assembly is disposed on either the housing body or the cover body.

21. The battery cell according to claim 1, characterized in that, The first pole column or the second pole column includes a pole column body and an electrical connection column. The electrical connection column is connected to the pole column body, and the elastic electrical connection member is provided on the electrical connection column. One end of the electrical connection column facing away from the pole column body is configured to be plugged into the second pole column or the first pole column of another adjacent battery cell.

22. The battery cell according to claim 21, wherein, The pole column body and the second pole column or the first pole column are both formed with the plugging grooves; two plugging portions are respectively formed at two ends of the electrical connection column. One of the two plugging portions is plugged into the plugging groove of the pole column body, and the other of the two plugging portions is plugged into the plugging groove of the second pole column or the first pole column of the adjacent battery cell.

23. The battery cell according to claim 22, characterized in that, The pole column body and the second pole column or the first pole column both protrude from the side wall of the respective housing where they are located, and the protruding portions of the pole column body and the second pole column or the first pole column are respectively recessed in a direction close to the side wall of the housing to form the plugging grooves respectively; or, The pole column body and the second pole column or the first pole column both recess inwardly relative to the side wall of the respective housing where they are located to directly form the plugging grooves.

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

25. The battery cell according to claim 24, characterized in that, The pole column body and the second pole column or the first pole column both protrude from the side wall of the respective housing where they are located to directly form the plugging portions; or, The pole column body and the second pole column or the first pole column both recess relative to the side wall of the respective housing where they are located, and the plugging portions smaller than the recessed size protrude at the recessed positions.

26. A battery device, characterized in that, Comprising: A plurality of battery cells according to any one of claims 1-25, the plurality of battery cells are stacked and arranged in a first direction, and the plugging portion of one adjacent battery cell is electrically connected to the plugging groove of another battery cell through the elastic electrical connection member.

27. The battery device according to claim 26, wherein The battery device includes a conductive adhesive, and the conductive adhesive is located in the plugging groove and connects the plugging portion and the first pole column or the second pole column.

28. The battery device according to claim 27, wherein The plugging portion includes a first end face in the first direction, the first end face is located in the plugging groove, the first pole column or the second pole column includes a second end face facing the plugging groove in the first direction, the conductive adhesive connects the first end face and the second end face, and the elastic electrical connection member connects the circumferential surface of the first pole column or the second pole column facing the plugging groove and the circumferential surface of the plugging portion.

29. The battery device according to any one of claims 26-28, characterized in that, The plugging portion and the plugging groove are connected in an interference fit manner.

30. The battery device according to claim 26, wherein, The battery device includes a sampling member. In the first direction, the first pole column of one adjacent battery cell is plugged into the second pole column of another battery cell, and the sampling member is in direct contact with the first pole column and / or the second pole column to collect the corresponding parameter information of the adjacent battery cells.

31. The battery device according to claim 30, wherein, The contact modes between the sampling member and the pole column assembly include at least one of the following: The sampling member directly contacts at least one of the first pole column and the second pole column in the axial direction of the pole column assembly; The sampling member directly contacts at least one of the first pole column and the second pole column in the circumferential direction of the pole column assembly; The sampling member directly contacts at least one of the first pole column and the second pole column in the radial direction of the pole column assembly.

32. The battery device according to claim 26, characterized in that, A plurality of the battery monomers are connected in series; or, A plurality of the battery monomers are connected in parallel; or, A plurality of the battery monomers have both series and parallel connections.

33. An electrical device, characterized in that, Comprising the battery monomer according to any one of claims 1-25, the battery monomer is used for providing electric energy, or; Comprising the battery device according to any one of claims 26-32, the battery device is used for providing electric energy.

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