Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The overcurrent capability of electric connection of two pole columns can be improved to a certain extent. The battery monomer comprises a shell, an electrode assembly and a pole assembly, wherein the shell is provided with two first side walls which are opposite to each other, the area of the first side walls is larger than that of other side walls, and the two first side walls are opposite to each other in the first direction; the electrode assembly is arranged in the shell; the polar column assembly comprises a first polar column and a second polar column which are opposite in polarity, the first polar column and the second polar column are electrically connected with the electrode assembly and are respectively arranged on the two first side walls, and the first polar column is configured to be in plug-in connection with the second polar column of another adjacent battery monomer, so that the two adjacent battery monomers are electrically connected. By arranging the pole on the first side wall with the largest area, the area of the pole can be increased, so that the over-current area of electric connection of the battery monomers is increased, and the quick charging performance is guaranteed.

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 pole columns of two battery cells is achieved through a tab. During the use of the battery device, vibration and shock often occur. In such a case, the tab will pull the welding mark between the tab and the pole column, resulting in a reduction in the reliability of the battery cell. Summary of the Invention

[0003] In view of the above problems, the present application provides a battery cell, a battery device, and an electrical device, which can increase the overcurrent capacity of the electrical connection between two pole columns to a certain extent.

[0004] In a first aspect, the present application provides a battery cell, which includes a housing, an electrode assembly, and a pole column assembly. Among them, the housing has two opposite first side walls, the area of the first side walls is larger than that of other side walls, and the two first side walls are arranged opposite to each other along a first direction; the electrode assembly is arranged inside the housing; the pole column assembly includes a first pole column and a second pole column with opposite polarities. Both the first pole column and the second pole column are electrically connected to the electrode assembly and are respectively arranged on the two first side walls. The first pole column is configured to be able to be inserted into the second pole column of another adjacent battery cell to electrically connect the adjacent two battery cells.

[0005] In the battery cell of the technical solution of the present application, by arranging the pole column on the first side wall with the largest area, the area of the pole column can be increased, thereby increasing the overcurrent area of the electrical connection of the battery cell and ensuring the fast charging performance. At the same time, since the battery cell expands during use, and the expansion force of the first side wall with the largest area is larger than that of other side walls, the insertion stability of the pole column between the first side walls is better. In addition, by inserting and connecting the first pole column and the second pole column with each other, the method of using pole column welding to achieve electrical connection can be avoided. Compared with the situation where the battery cell cannot be disassembled and reused after welding the pole columns, the insertion solution is also beneficial to the disassembly, assembly, and repeated use of the battery cell, improving the maintainability of the battery.

[0006] In some embodiments, the first pole column includes an insertion portion, and the second pole column is formed with an insertion slot adapted to the insertion portion; the insertion portion can be directly inserted into the insertion slot of another adjacent battery cell.

[0007] In the embodiments of the present application, two adjacent battery cells are plugged into each other through the plugging portion of a first pole and the plugging groove on another battery cell, replacing the connection method of welding the copper bar to the pole assembly of the adjacent battery cell to achieve the electrical connection of the battery cells. Thus, defects such as false soldering and blasting holes generated by welding the copper bar to the pole assembly are improved, thereby improving the reliability of the electrical connection between the battery cells. At the same time, using the above plugging and matching method to replace welding can achieve the disassembly of the battery cells compared with welding, and can improve the maintainability of the battery device.

[0008] In some embodiments, the first pole includes a plugging portion that protrudes from the first side wall where the first pole is located, and the second pole is formed with a plugging groove that is concave with respect to the first side wall where the second pole is located.

[0009] In the embodiments of the present application, the plugging portion protrudes from the first side wall where the first pole is located, and the plugging groove is concave with respect to the first side wall where the second pole is located. The first pole and the second pole of two battery cells are electrically connected by inserting the plugging portion into the plugging groove. The part of the first pole 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.

[0010] In some embodiments, the first pole includes a plugging portion that protrudes from the first side wall where the first pole is located, the second pole protrudes from its own first side wall, and the protruding end of the second pole is formed with a plugging groove that is concave with respect to the end of the second pole facing the first side wall, and the depth of the concave plugging groove is less than or equal to the height of the second pole protruding from the first side wall.

[0011] In the embodiments of the present application, the plugging portion protrudes from the first side wall where the first pole is located, and the plugging groove is concave with respect to the first side wall where the second pole is located. The first pole and the second pole of two battery cells are electrically connected by inserting the plugging portion into the plugging groove, thereby efficiently connecting the two battery cells and improving the grouping efficiency of the battery device to a certain extent.

[0012] In some embodiments, the first pole of one battery cell is directly opposite to the second pole of another adjacent battery cell in the first direction, and the battery cell is configured such that at least a part of the plugging portion is inserted into the plugging groove of another adjacent battery cell in the first direction.

[0013] In the embodiments of the present application, the first pole of one battery cell is directly opposite to the second pole of another adjacent battery cell in the first direction, and the plugging portion of the first pole is partially or completely inserted into the plugging groove of the second pole on another battery cell, so that two adjacent battery cells are plugged into each other in the first direction through the first pole and the second pole, realizing a stable and reliable electrical connection.

[0014] In some embodiments, the first pole piece includes a pole piece body and an electrical connector that is inserted and mated with the pole piece body. One end of the electrical connector facing away from the pole piece body is configured to be inserted into a second pole piece of another adjacent battery cell.

[0015] By connecting the pole piece bodies of adjacent battery cells through the electrical connector, compared with directly inserting the pole piece bodies of adjacent battery cells into each other, not only can the shape of each pole piece body be unified and standardized to ensure the manufacturing efficiency of the pole piece body, but also it is convenient to adjust the distance between adjacent battery cells through the intermediate electrical connector to adapt to the expansion of the battery cells, which can further improve the reliability of the electrical connection between the battery cells.

[0016] In some embodiments, both the pole piece body and the second pole piece are formed with insertion grooves; two insertion portions are respectively formed at both ends of the electrical connector, and one of the two insertion portions is inserted into the insertion groove of the pole piece body, and the other of the two insertion portions is inserted into the insertion groove of the second pole piece of the adjacent battery cell.

[0017] In the embodiments of the present application, the electrical connection between the pole piece body, the electrical connector, and the second pole piece is realized by inserting the insertion portion into the insertion groove. The operation is relatively simple and the connection is relatively stable. At the same time, the two battery cells that have completed the electrical connection can be exempted from welding fit, thereby avoiding the problem that the electrode assembly is easily damaged when the welding position of the pole piece assembly is disassembled.

[0018] In some embodiments, both the pole piece body and the second pole piece protrude from the respective first side walls where they are located, and the protruding parts of the pole piece body and the second pole piece are respectively recessed in the direction close to the first side wall to form insertion grooves; alternatively, both the pole piece body and the second pole piece are recessed relative to the respective first side walls where they are located to directly form insertion grooves.

[0019] In the embodiments of the present application, both the pole piece body and the second pole piece protrude from the respective first side walls where they are located, thereby reducing the influence of the damage of the pole piece assembly on the internal electrode assembly and other structures of the battery cell. In addition, it is convenient for molding and assembly in the case where the first pole piece and the second pole piece are integrally formed with the battery cell.

[0020] In the embodiments of the present application, the pole piece body and the second pole piece are recessed from the respective first side walls into the interior of the battery cell to form insertion grooves, so that the electrical connector is directly inserted into the inner side of the surface of the battery cell, and the pole piece assembly is not easily deformed under conditions such as collision, extrusion, and pulling, and the insertion structure between the insertion groove and the electrical connector is relatively stable.

[0021] In some embodiments, both the pole column body and the second pole column are provided with insertion portions, and insertion slots are respectively formed at both ends of the electrical connection member; one of the two insertion slots is inserted into the insertion portion of the pole column body, and the other of the two insertion slots is configured to be inserted into the insertion portion of the second pole column of an adjacent battery cell.

[0022] In the embodiments of the present application, the electrical connection between the pole column body, the electrical connection member and the second pole column is realized by inserting the insertion portion into the insertion slot, the operation is relatively simple, and the connection is relatively stable. At the same time, the two battery cells that have completed the electrical connection can be exempted from welding cooperation, thereby avoiding the problem that the electrode assembly is easily damaged when the welding position of the pole column assembly is disassembled.

[0023] In some embodiments, both the pole column body and the second pole column protrude from the respective first side walls where they are located to directly form the insertion portions; alternatively, both the pole column body and the second pole column are recessed relative to the respective first side walls where they are located, and insertion portions smaller than the groove size protrude at the recessed positions.

[0024] In the embodiments of the present application, the pole column body and the second pole column protrude from the respective first side walls where they are located, thereby reducing the influence of the damage of the pole column assembly on the electrode assembly and other structures 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.

[0025] In the embodiments of the present application, the pole column body and the second pole column are recessed from the respective first side walls into the interior of the battery cell, so that the electrical connection member is directly inserted into the inner side of the surface of the battery cell, and the insertion portion and the insertion slot are inserted on the inner side of the surface of the battery cell, thereby reducing external interference and improving the connection reliability between the electrical connection member and the battery cell.

[0026] In some embodiments, the electrode assembly includes a main body portion and a pole ear 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. The second region is close to the edge of the first side wall, and the first pole column and the second pole column are arranged in the second region and are electrically connected to the pole ear.

[0027] In the embodiments of the present application, the first region covers the main body portion, and the second region covers the pole ear. 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 arranged in the second region, so that the pole columns are less affected by the expansion of the electrode assembly. In addition, the pole columns are arranged close to the edge of the first side wall, improving the high-voltage protection during assembly, maintenance, etc.

[0028] In some embodiments, the main body portion includes wound or stacked pole pieces, and the pole pieces are coated with an active material layer to generate electric energy. The region of the pole piece coated with the active material layer is directly opposite to the first region in the first direction.

[0029] In the embodiments of the present application, the active material layer is coated on the electrode plate and is spaced at a relatively small distance from the tab at the edge of the electrode plate where the tab is formed. The projection of the active material layer on the first side wall in the first direction is completely within the range of the first region. The first side wall may be parallel to the active material layer in the first region, and both the first region and the plane where the active material layer is located may be perpendicular to the first direction.

[0030] In some embodiments, the first side wall is square, the first side wall has two short sides opposite to each other in the second direction and two long sides opposite to each other in the third direction, the length of the short side is less than that of the long side, the second direction, the third direction and the first direction are perpendicular to each other in pairs, the second region is arranged close to one of the short side and the long side, and the first pole column and the second pole column extend along the length direction of the short side or the long side close to the second region and are strip-shaped.

[0031] In the embodiments of the present application, the pole column extends in a strip shape along the length direction of the short side or the long side close to it, which is beneficial to dispersing stress in the length direction of the edge of the first side wall and improving the structural stability of the pole column insertion.

[0032] In some embodiments, the battery cell includes an elastic electrical connector, the elastic electrical connector is arranged on the first pole column and / or the second pole column, and the elastic electrical connector is used for elastically abutting between the first pole column and the second pole column of the adjacent battery cell when the first pole column is inserted into the second pole column of the adjacent battery cell, so as to realize the electrical connection of two adjacent battery cells.

[0033] In the embodiments of the present application, the elastic electrical connector elastically abuts between the insertion part of one battery cell and the insertion groove of another adjacent battery cell. The elastic electrical connector can keep the insertion part and the insertion groove in full contact under static and dynamic conditions such as vibration and impact, so as to improve the electrical contact area between the two pole columns to a certain extent, reduce the overcurrent impedance and heating problems, improve the electrical connection reliability of two adjacent battery cells, and reduce or avoid safety problems.

[0034] In some embodiments, the elastic electrical connectors are distributed along the circumferential direction of the pole column assembly.

[0035] In the embodiments of the present application, the elastic electrical connectors are distributed along the circumferential direction of the pole column assembly, which can improve the connection area between the first pole column and the second pole column to a certain extent.

[0036] In some embodiments, the elastic electrical connector includes a first end and a second end, the first end is fixedly connected to the first pole column or the second pole column, and the second end is movable relative to the first pole column or the second pole column to which it is connected.

[0037] In the embodiments of the present application, when the first pole column and the second pole column are assembled, the insertion portion is inserted into the insertion groove. The first end of the elastic electrical connector is fixedly connected to the pole column, and the second end is movable. When the elastic electrical connector is squeezed, the second end can move, and the elastic electrical connector is easy to deform, which can avoid damaging the elastic electrical connector to a certain extent and reduce the assembly resistance.

[0038] In some embodiments, the pole column assembly is provided with a groove, and the battery cell is configured such that when the elastic electrical connector deforms during the assembly process of the first pole column and the second pole column, the second end is inserted into the groove to release the stress of the elastic electrical connector.

[0039] In the embodiments of the present application, during the assembly process of the first pole column and the second pole column, when the elastic electrical connector is deformed by the extrusion of the two pole columns, the second end moves to insert into the groove to release the stress of the elastic electrical connector, which can avoid the situation that the elastic electrical connector is damaged due to excessive extrusion to a certain extent.

[0040] In some embodiments, the battery cell includes a pressure relief mechanism, and the pressure relief mechanism is disposed on the surface of the housing different from the first side wall. The pressure relief mechanism is used to crack prior to the housing when the internal pressure of the battery cell exceeds the pressure threshold.

[0041] In the embodiments of the present application, by disposing the pressure relief mechanism on the surface of the housing different from the first side wall, 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 side wall 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, and further reducing the safety risk.

[0042] In some embodiments, the housing is provided with an installation hole, and the entire pole column assembly is covered outside the installation hole, or a part of the pole column assembly is covered outside the installation hole, and a part of the pole column assembly passes through the installation hole and extends into the housing to cooperate with the housing.

[0043] In the embodiments of the present application, the entire pole column assembly is covered outside the installation 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 first pole column and the housing, so that after the first pole column and the housing are combined, they 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.

[0044] A part of the pole column assembly is covered outside the installation hole, and a part of it passes through the installation hole and extends into the housing to cooperate with the housing, which is beneficial to improving the electrical connection stability and overcurrent capacity between the pole column assembly and the electrode assembly inside the housing.

[0045] 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 is disposed on either the housing body or the cover body.

[0046] In a second aspect, an embodiment of the present application provides a battery device. The battery device includes the battery cell of any of the above embodiments. Two first side walls of the battery cell face each other along a first direction, and the number of battery cells is multiple and arranged along the first direction.

[0047] In the battery device of the technical solution of the present application, by providing the pole column on the first side wall with the largest area in the battery cell, the area of the pole column 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 between the first side walls is better. In addition, by the mutual insertion connection of the first pole column and the second pole column, it is also beneficial to the repeated cascade utilization of the battery cell and improves the maintainability of the battery.

[0048] In the embodiment of the present application, 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, which is convenient for the assembly and production of the housing and the electrode assembly.

[0049] In some embodiments, the battery device includes an adapter. Multiple battery cells are arranged in a row along the first direction to form multiple battery groups, and the multiple battery groups are arranged along a second direction. Among two adjacent battery groups along the second direction, one of the battery cells at the head and tail ends along the first direction is connected to the adapter to realize the electrical connection between two adjacent battery groups.

[0050] In the embodiment of the present application, the electrical connection between two adjacent battery groups is realized by connecting the adapter to the head or tail end of two adjacent battery groups in the first direction, which improves the grouping efficiency of the battery device.

[0051] In some embodiments, the adapter is formed with a second insertion slot or a second insertion portion and is inserted into the battery cell.

[0052] In the embodiment of the present application, the adapter is inserted into the battery cell through the second insertion slot or the second insertion portion to realize the electrical connection between the adapter and the battery cell, ensuring better electrical connection stability.

[0053] In some embodiments, the battery device includes a sampling member. The sampling member is in direct contact with the pole column to collect parameter information of at least one of two adjacent battery cells.

[0054] In the embodiment of the present application, the sampling member is in direct contact with the pole column, which improves the accuracy and synchronization of collecting the parameter information of the battery cell.

[0055] In some embodiments, the contact mode between the sampling member and the pole column assembly includes at least one of the following:

[0056] The sampling member contacts at least one of the first pole column and the second pole column it is connected to in the axial direction of the pole column assembly;

[0057] The sampling member contacts at least one of the first pole column and the second pole column it is connected to in the circumferential direction of the pole column assembly;

[0058] The sampling member contacts at least one of the first pole column and the second pole column it is connected to in the radial direction of the pole column assembly.

[0059] In the embodiments of the present application, the sampling member can contact the first pole column and / or the second pole column in at least one of the axial, circumferential, and radial directions of the pole column, realizing the electrical connection between the sampling member and the first pole column and / or the second pole column, so as to provide a flexible sampling connection scheme for different connection modes of the pole column assembly. The arrangement of the sampling member is more flexible, and to a certain extent, it alleviates the space limitation of the battery device on the sampling member.

[0060] In some embodiments, the battery device further includes a box body, a first expansion beam, and a second expansion beam; the first expansion beam and the second expansion beam are arranged at intervals, and the three of them together enclose a battery compartment. A plurality of battery cells are arranged in sequence in the battery compartment, and the battery cells at the ends are respectively matched with the first expansion beam and the second expansion beam.

[0061] In the embodiments of the present application, the first expansion beam, the second expansion beam, and the box body together enclose a battery compartment. A plurality of battery cells are arranged in sequence in the battery compartment, and the battery cells at the ends are respectively matched with the first expansion beam and the second expansion beam. Thus, while saving installation space and increasing energy density, the first expansion beam and the second expansion beam can provide good restraint for the expansion of the battery cells.

[0062] In some other embodiments, the battery device further includes a box body, a module housing, and a mounting beam. A plurality of battery cells are arranged in the module housing, and the module housing is mounted in the box body through the mounting beam. In the embodiments of the present application, the module housing provides a stable and reliable installation space for the battery cells.

[0063] In a third aspect, the embodiments of the present application provide an electrical device. The electrical device includes the battery cell of any one of the above embodiments, and the battery cell is used to provide electrical energy, or includes the battery device of any one of the above embodiments, and the battery device is used to provide electrical energy.

[0064] In the electrical device of the technical solution of the present application, the pole column is arranged on the first side wall with the largest area of the battery cell, and the electrical connection area between the two pole columns can also be increased to maintain a large overcurrent capacity, thereby improving the fast charging performance of the battery cell, the battery device and the electrical device using the battery cell to a certain extent, and improving the electrical connection reliability between the two pole columns.

[0065] In some embodiments, the electrical device is a vehicle, the battery device includes a box body, and a plurality of battery cells are arranged in the box body; at least a part of the chassis of the vehicle constitutes the upper cover of the box body.

[0066] In the embodiment of the present application, the chassis of the vehicle constitutes the upper cover of the box body, thereby saving the connection structure and improving the structural compactness inside the vehicle.

[0067] 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 following specifically illustrates the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0069] Figure 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0070] Figure 2 is an exploded structural diagram of a battery device according to some embodiments of the present application;

[0071] Figure 3 is an exploded structural diagram of a battery cell according to some embodiments of the present application;

[0072] Figure 4 is a schematic diagram of two battery cells before assembly according to some embodiments of the present application;

[0073] Figure 5 is a schematic diagram of two battery cells before assembly according to other embodiments of the present application;

[0074] Figure 6 For the present application Figure 4 is a schematic diagram of the battery cell in the front view angle according to the embodiment shown in the present application;

[0075] Figure 7 For the present application Figure 5Schematic diagram of a battery cell of the illustrated embodiment from a front view perspective;

[0076] Figure 8 Schematic diagram of the structure of a battery cell according to some embodiments of the present application;

[0077] Figure 9 Schematic diagram before assembly of two battery cells according to some embodiments of the present application;

[0078] Figures 10 to 11 Schematic diagram of the structure of the first pole column according to some embodiments of the present application;

[0079] Figure 12 Schematic diagram of the structure of the second pole column according to some embodiments of the present application;

[0080] Figure 13 Cross-sectional schematic diagram of the second pole column according to some embodiments of the present application;

[0081] Figure 14 Cross-sectional schematic diagram of the assembly of two battery cells according to some embodiments of the present application;

[0082] Figure 15 For Figure 14 Enlarged view of part A1;

[0083] Figure 16 For Figure 15 Enlarged view of part A2.

[0084] Figure 17 Partial cross-sectional schematic diagram before assembly of two battery cells according to some embodiments of the present application;

[0085] Figure 18 For Figure 17 Enlarged view of part C2;

[0086] Figure 19 Cross-sectional schematic diagram of the assembly process of two battery cells according to some embodiments of the present application;

[0087] Figure 20 For Figure 19 Enlarged view of part B1;

[0088] Figure 21 For Figure 20 Enlarged view of part B2;

[0089] Figure 22 Schematic diagram before assembly of the first pole column and the second pole column according to other embodiments of the present application;

[0090] Figure 23 One of the partial cross-sectional schematic diagrams of a battery device according to some embodiments of the present application;

[0091] Figure 24 The second partial cross-sectional view of the battery device according to some embodiments of the present application;

[0092] Figure 25 The structural schematic diagram of the assembly of two battery cells according to some other embodiments of the present application;

[0093] Figure 26 The structural schematic diagram of the assembly of two battery cells according to still some other embodiments of the present application;

[0094] Figure 27 The structural schematic diagram of the battery cell according to some other embodiments of the present application;

[0095] Figure 28 is Figure 27 The structural schematic diagram of the battery cell from a top-down perspective.

[0096] The reference numerals in the specific embodiments are as follows:

[0097] Vehicle 1000; battery device 100, controller 200, motor 300;

[0098] Box body 10, first part 11, second part 12, battery compartment 15, cross beam 16, longitudinal beam 17, battery pack 18;

[0099] Battery cell 20, pole column assembly 21, groove 211, elastic electrical connector 22, first end 221, second end 222, first pole column 23, insertion part 231, first base 232, pole column body 230, electrical connector 30, second pole column 24, insertion slot 241, second base 242, mating part 243, housing 25, first side wall 251, first region 2511, second region 2512, short side 2513, long side 2514, electrode assembly 26, main body part 261, pole ear part 262, housing body 252, opening 2521, cover body 253, pressure relief mechanism 254, accommodation groove 257, sampling part 41, output wire 42. Specific embodiments

[0100] Next, embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0101] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill 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 specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0102] In the description of the embodiments of the present 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 specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0103] Referring to "embodiment" herein means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0104] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may 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.

[0105] In the description of the embodiments of the present application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0106] 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 indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0107] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may also be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may 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.

[0108] At present, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0109] In related technologies, a battery device includes a plurality of battery cells, and the electrical connection between two battery cells is realized through two pole columns. During the use of the battery device, vibration and shock often occur. In this case, it may lead to insufficient electrical contact surface, and then the overcurrent capacity of the electrical connection between the two pole columns is small, and the local resistance is too large, which is not conducive to improving the fast charging performance.

[0110] In order to increase the overcurrent capacity of the electrical connection between two pole columns, the present application provides a battery cell, which includes a housing, an electrode assembly, and a pole column. The housing has two opposite first side walls, the area of the first side walls is larger than that of other side walls, and the two first side walls face away from each other in a first direction; the electrode assembly is arranged in the housing; the pole column includes a first pole column and a second pole column with opposite polarities. The first pole column and the second pole column are both electrically connected to the electrode assembly and are respectively arranged on the two first side walls. The first pole column is used for plugging into the second pole column of another adjacent battery cell to electrically connect the two battery cells.

[0111] In such a battery cell, the pole column is arranged on the first side wall with the largest area of the battery cell, and the area of the pole column is increased, thereby increasing the overcurrent area of the electrical connection of the battery cell, which is beneficial to improving and stabilizing the fast charging performance.

[0112] The battery device can be used as a power source for an electrical device or various energy storage systems using the battery device as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0113] For the convenience of description in the following embodiments, a vehicle 1000, which is an electrical device in an embodiment of the present application, is taken as an example for description.

[0114] 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 or an extended-range vehicle, etc. A battery device 100 is disposed inside vehicle 1000. The battery device 100 can be disposed at the bottom, the head or the tail of vehicle 1000. The battery device 100 can be used for power supply of vehicle 1000. For example, the battery device 100 can be used as an operating power source for 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.

[0115] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source for vehicle 1000, but also be used as a driving power source for vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0116] 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 a battery compartment 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 a battery compartment 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 the open side of the second part 12 so that the first part 11 and the second part 12 jointly define a battery compartment; 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 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.

[0117] 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 and then the whole formed by the multiple battery cells 20 is accommodated in the box body 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 body 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.

[0118] 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 a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc.

[0119] Please refer to Figures 3 to 9 , an embodiment of the present application provides a battery cell 20, which includes a housing 25, an electrode assembly 26 and a terminal assembly 21. Among them, the housing 25 has two opposite first side walls 251, the area of the first side walls 251 is larger than that of other side walls, and the two first side walls 251 face away from each other in the first direction; the electrode assembly 26 is arranged in the housing 25; the terminal assembly 21 includes a first terminal 23 and a second terminal 24 with opposite polarities. Both the first terminal 23 and the second terminal 24 are electrically connected to the electrode assembly 26 and are respectively arranged on the two first side walls 251. The first terminal 23 is used for plugging into the second terminal 24 of another adjacent battery cell 20 to electrically connect the two battery cells 20. The front-back direction shown in the figure is the first direction.

[0120] Please refer to Figure 3 , Figure 3 is an exploded structural schematic diagram of the battery cell 20 provided by some embodiments of the present application. The battery cell 20 refers to the smallest unit that makes up the battery device 100.

[0121] The housing 25 is a component for forming 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 sizes, such as cuboid shape, cylindrical shape, hexagonal prism shape, 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.

[0122] Optionally, please combine Figures 3 - 5, in some examples, the housing 25 is in the shape of a cuboid or a flat body. The housing 25 has six surfaces, namely the front, rear, left, right, top, and bottom surfaces. The first direction is the front-rear direction, and the first side walls 251 form the front and rear surfaces 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 the housing 25 on any one of the left, right, top, and bottom sides.

[0123] Optionally, please combine Figures 3 - 5 , 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.

[0124] Optionally, in one embodiment, the first pole 23 is a positive pole and the second pole 24 is a negative pole. In some other examples, the first pole 23 is a negative pole and the second pole 24 is a positive pole. A first pole 23 can be provided on the front first side wall 251, and a second pole 24 can be provided on the rear first side wall 251.

[0125] Optionally, in one embodiment, the number of pole assemblies 21 on the same first side wall 251 can also be two or more.

[0126] Optionally, in one embodiment, please combine Figure 8 , the first direction is the front-rear direction. Two pole assemblies 21 are provided on the front first side wall 251, and two pole assemblies 21 are provided on the rear first side wall 251. The two pole assemblies 21 at the front are negative poles or positive poles ( Figure 8 negative poles in Figure 8 ), and the two pole assemblies 21 at the rear are both positive poles or negative poles ( positive poles in

[0127] ). Thus, two battery cells 20 connected through the pole assembly 21 in the front-rear direction are connected in series.

[0127] Optionally, in one embodiment, please combine Figure 9, there are two pole assemblies 21 provided on the front first side wall 251. There are two pole assemblies 21 provided on the front first side wall 251. Among the two front pole assemblies 21, one is a negative pole assembly and the other is a positive pole assembly. Among the two front pole assemblies 21, one is a positive pole assembly and the other is a negative pole assembly. Thus, two battery cells 20 connected through the pole assemblies 21 in the front-back direction are connected in parallel. When connected in parallel, the negative pole assembly on the rearward first side wall 251 of the front battery cell 20 can be connected to the negative pole assembly on the forward first side wall 251 of the rear battery cell 20, and the positive pole assembly on the rearward first side wall 251 of the front battery cell 20 can be connected to the positive pole assembly on the forward first side wall 251 of the rear battery cell 20.

[0128] In the battery cell 20 of the technical solution of the present application, by providing the pole assembly 21 on the first side wall 251 with the largest area, the area of the pole assembly 21 can be increased, thereby increasing the 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 relatively large expansion force compared to other side walls, the plugging stability of the pole assembly 21 between the first side walls 251 is good. In addition, by the mutual plugging connection of the first pole 23 and the second pole 24, the method of realizing electrical connection by welding the poles can be avoided. Compared with the situation that the battery cell 20 cannot be disassembled and reused after welding the poles, the plugging solution is also beneficial to the disassembly, assembly and reuse of the battery cell 20, and improves the maintainability of the battery cell 20 and the battery device 100.

[0129] In some embodiments, the first pole 23 includes a plugging portion 231, and the second pole 24 is formed with a plugging groove 241 adapted to the plugging portion 231; the plugging portion 231 can be directly plugged into the plugging groove 241 of another adjacent battery cell 20.

[0130] Specifically, the plugging groove 241 is a groove, the plugging portion 231 is a convex structure matching the shape and size of the plugging groove 241, and at least a part of the plugging portion 231 is received in the plugging groove 241 to complete the plugging of the first pole 23 and the second pole 24.

[0131] In the embodiments of the present application, two adjacent battery cells 20 are plugged together through the plugging portion 231 of a first pole 23 and the plugging groove 241 on another battery cell 20, replacing the connection method of welding a copper bar to the pole assembly 21 of the adjacent battery cell 20 to achieve electrical connection of the battery cells 20. This improves defects such as false soldering and blasting holes caused by welding the copper bar to the pole assembly 21, thereby improving the reliability of the electrical connection between the battery cells 20. At the same time, using the above plugging and mating method to replace welding can make the battery cell 20 detachable compared to welding, improving the maintainability of the battery cell 20 and the battery device 100.

[0132] Please refer to Figures 10 to 16 , in some embodiments, the first pole 23 includes a plugging portion 231 that protrudes from the first side wall 251 where the first pole 23 is located, and the second pole 24 is formed with a plugging groove 241 that is concave with respect to the first side wall 251 where the second pole 24 is located.

[0133] Specifically, in combination with Figure 11 and Figure 13 , the first pole 23 and the second pole 24 are connected by a mortise and tenon type plugging method, and the shapes of the plugging portion 231 and the plugging groove 241 are adapted to each other. Thus, the cooperation between the first pole 23 and the second pole 24 is relatively tight, improving the connection reliability of the pole assembly 21 to a certain extent.

[0134] In combination with Figure 15 , the first pole 23 includes a plugging portion 231, the second pole 24 is provided with a plugging groove 241, and at least a part of the plugging portion 231 is located in the plugging groove 241, so that the first pole 23 and the second pole 24 can be connected by a convex-concave complementary method, canceling the welding or bolt connection between the two pole assemblies 21 by a bar piece, improving the grouping efficiency of the battery system, the maintainability after sales, and the cascade utilization of the battery cell 20.

[0135] It should be noted that in this embodiment, the plugging portion 231 protrudes from the first side wall 251 where the first pole 23 is located, and the first base 232 of the first pole 23 can protrude relative to the first side wall 251 or be recessed into the housing 25 relative to the first side wall 251.

[0136] For two battery cells 20 arranged along the first direction, the plugging portion 231 of one battery cell 20 can be plugged into the plugging groove 241 of the other battery cell 20, thereby efficiently connecting the two battery cells 20 and improving the grouping efficiency of the battery device 100 to a certain extent.

[0137] In the embodiments of the present application, the insertion portion 231 protrudes from the first side wall 251 where the first pole 23 is located, the insertion slot 241 is recessed relative 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 insertion portion 231 into the insertion slot 241. The portion 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.

[0138] Please refer to Figures 5 to 13 , in some embodiments, the first pole 23 includes an insertion portion 231 that 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 the protruding end of the second pole 24 forms an insertion slot 241. The insertion slot 241 is recessed relative to the end of the second pole 24 toward the first side wall 251, and the depth of the recess of the insertion slot 241 is less than or equal to the height of the second pole 24 protruding from the first side wall 251.

[0139] Optionally, in combination with Figure 11 and Figure 13 , the insertion portion 231 can contact the surface of the second pole 24 facing into the insertion slot 241, thereby increasing the connection area of the two pole assemblies 21. Optionally, the first pole 23 includes a first base 232, and the insertion portion 231 is provided on the first base 232. The second pole 24 includes a second base 242 and a mating portion 243. The mating portion 243 is provided on the second base 242, and the mating portion 243 is provided with an insertion slot 241. In this embodiment, the mating 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.

[0140] In the embodiments of the present application, the insertion portion 231 protrudes from the first side wall 251 where the first pole 23 is located, the insertion slot 241 is recessed relative to the first side wall 251 where the second pole 24 is located, and the first pole 23 and the second pole 24 of the two battery cells 20 are electrically connected by inserting the insertion portion 231 into the insertion slot 241, thereby efficiently connecting the two battery cells 20 and improving the grouping efficiency of the battery device 100 to a certain extent.

[0141] Please refer to Figures 14 to 16 , in some embodiments, the first pole 23 of one battery cell 20 is directly opposite to the second pole 24 of another adjacent battery cell 20 in the first direction, and the battery cell 20 is configured such that at least a part of the insertion portion 231 is inserted into the insertion slot 241 of another adjacent battery cell 20 in the first direction.

[0142] Specifically, the first terminal post 23 and the second terminal post 24 may both extend linearly along the first direction, protrude from the first side wall 251 or be recessed relative to the first side wall 251. The first terminal post 23 and the second terminal post 24 face each other along the first direction, and the positions of the first terminal post 23 and the second terminal post 24 of two adjacent battery cells 20 along the first direction are arranged to face each other along the first direction, and a pair of first and second electrodes inserted into each other on the two battery cells 20 are inserted along the first direction.

[0143] In the embodiment of the present application, the first terminal post 23 of one battery cell 20 faces the second terminal post 24 of another adjacent battery cell 20 along the first direction, and the insertion portion 231 of the first terminal post 23 is partially or completely inserted into the insertion slot 241 of the second terminal post 24 on another battery cell 20, so that two adjacent battery cells 20 are inserted into each other in the first direction through the first terminal post 23 and the second terminal post 24, realizing stable and reliable electrical connection.

[0144] Please refer to Figures 25 to 26 , in some embodiments, the first terminal post 23 includes a terminal post body 230 and an electrical connector 30 that is inserted and cooperated with the terminal post body 230. One end of the electrical connector 30 facing away from the terminal post body 230 is configured to be inserted into the second terminal post 24 of another adjacent battery cell 20.

[0145] Specifically, two adjacent battery cells 20 along the first direction are inserted into both sides of the same electrical connector 30 to realize the electrical connection of two adjacent battery cells 20. The electrical connector 30 matches the shape and size of the terminal post body 230. For example, the terminal post body 230 is in a long strip shape, and the electrical connector 3 is a long strip columnar structure that matches the size of the terminal post body 230.

[0146] Optionally, the electrical connector 30 may also be a short and thick cylinder or other composite structures. Optionally, the electrical connector 30 may be cylindrical, prismatic or other shapes, and the present application does not limit this.

[0147] Optionally, the electrical connector 30 and the terminal post body 230 are of a split structure. Optionally, insertion slots 241 are formed at both ends of the electrical connector 30. Optionally, insertion portions 231 are formed at both ends of the electrical connector 30. Optionally, one end of the two ends of the electrical connector 30 is formed with an insertion slot 241, and the other end is formed with an insertion portion 231. An insertion slot 241 that matches the insertion portion 231 of the electrical connector 30, or an insertion post that matches the insertion slot 241 of the electrical connector 30, is formed on the second terminal post 24.

[0148] Optionally, the terminal post bodies 230 of two adjacent battery cells 20 along the first direction are arranged opposite to each other along the first direction. A plurality of battery cells 20 are sequentially connected along the first direction through a plurality of electrical connectors 30.

[0149] In the embodiment of the present application, the electrical connection of the two battery cells 20 is achieved by plugging the two battery cells 20 into the electrical connector 30 respectively, which replaces the connection method of using copper bars to weld the poles of adjacent battery cells 20 to achieve the electrical connection of the battery cells 20, thereby improving the defects such as cold welding and burst holes caused by welding the copper bars to the poles, thereby improving the reliability of the electrical connection between the battery cells 20; on the other hand, connecting the pole bodies 230 of adjacent battery cells 20 through the electrical connector 30, compared with directly plugging the pole bodies 230 of adjacent battery cells 20 into each other, not only can the shape of each pole body 230 be standardized to ensure the manufacturing efficiency of the pole body 230, but also the distance between adjacent battery cells 20 can be adjusted conveniently through the middle electrical connector 30 to adapt to the expansion of the battery cells 20, which can further improve the reliability of the electrical connection between the battery cells 20.

[0150] Please refer to Figure 25 In some embodiments, both the pole body 230 and the second pole 24 are formed with an insertion groove 241; two insertion portions 231 are formed at both ends of the electrical connector 30, one of the two insertion portions 231 is inserted into the insertion groove 241 of the pole body 230, and the other of the two insertion portions 231 is inserted into the insertion groove 241 of the second pole 24 of the adjacent battery cell 20.

[0151] Optionally, the pole body 230 may form a plug-in slot 241 having a circular, elliptical, triangular, square, polygonal, racetrack-shaped or other irregular cross-section. Optionally, the cross-section of the plug-in portion 231 may be circular, elliptical, triangular, square, polygonal, racetrack-shaped or other irregular shapes that match the plug-in slot 241.

[0152] Optionally, the pole body 230 extends along the length of the side of the battery cell 20 to which it is adjacent, forming a long strip. The electrical connector 30 is a column with a length close to that of the pole body 230. Furthermore, the insertion slot 241 and the insertion portion 231 both extend along the length of the pole body 230 to form a long strip. This arrangement increases the connection area, is particularly beneficial for dispersing stress along the length of the side of the battery cell 20, and ensures the structural stability of the connection between the pole body 230 and the electrical connector 30.

[0153] Optionally, the insertion slot 241 includes a slot bottom surface 2112 and a slot inner circumferential surface 2113. The slot bottom surface 2112 is the deepest point of the insertion slot 241 along the recessed direction, and the slot inner circumferential surface 2113 can connect the slot bottom surface 2112 to the surface of the battery cell 20 or the end face of the terminal assembly 21. Furthermore, the insertion slot 241 is recessed along a first direction, and the slot inner circumferential surface 2113 surrounds the insertion slot 241 in the vertical direction and the left-right direction.

[0154] Optionally, the insertion part 231 is a convex structure adapted to the insertion slot 241. The insertion part 231 is inserted into the insertion slot 241. The top end of the insertion part 231 in the first direction is received in the insertion slot 241. The end face of the insertion part 231 can abut against the bottom face 2112 of the slot, and the peripheral wall of the insertion part 231 can abut against the inner peripheral face 2113 of the slot.

[0155] In the embodiment of the present application, the electrical connection between the pole body 230, the electrical connector 30 and the second pole 24 is realized by inserting the insertion part 231 into the insertion 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 avoid 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.

[0156] In some embodiments, both the pole body 230 and the second pole 24 protrude from the respective first side wall 251 where they are located, and the protruding parts of the pole body 230 and the second pole 24 are each recessed in the direction close to the first side wall 251 to respectively form the insertion slot 241; or, please refer to Figure 25 , both the pole body 230 and the second pole 24 are recessed inwardly relative to the respective first side wall 251 where they are located to directly form the insertion slot 241.

[0157] Optionally, the pole body 230 has a first base 232, the second pole 24 has a second base 242, and the insertion slot 241 is recessed relative to the first base 232 into the interior of the battery cell 20 where the pole body 230 is located, and is also recessed relative to the second base 242 into the interior of the battery cell 20 where the second pole 24 is located.

[0158] For the convenience of description, the inner and outer sides of the battery cell 20 are distinguished by the respective first side walls 251 where the pole body 230 and the second pole 24 are 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.

[0159] Optionally, in an example, both the pole body 230 and the second pole 24 protrude from the respective first side wall 251 where they are located, and at least a part of both the pole body 230 and the second pole 24 is located outside the battery cell 20. The first base 232 and the second base 242 are both located outside the battery cell 20 and are at a certain distance from the respective first side wall 251 where they are located. The bottom face 2112 of the insertion slot 241 can be located inside the battery cell 20, and a part of the inner peripheral face 2113 of the insertion slot 241 is located inside the battery cell 20 and a part is located outside the battery cell 20. The bottom face 2112 can also be located outside the battery cell 20, then the entire inner peripheral face 2113 is located outside the battery cell 20.

[0160] In an embodiment of the present application, the pole column body 230 and the second pole column 24 both protrude from the respective first side wall 251 where they are located, thereby reducing the impact of damage to the pole column assembly 21 on structures such as the electrode assembly 26 inside the battery cell 20. In addition, when the first pole column 23 and the second pole column 24 are integrally formed with the battery cell 20 separately, it is convenient for molding and assembly.

[0161] Optionally, in another example, the first base 232 and the second base 242 are respectively connected to two adjacent first side walls 251 of two adjacent battery cells, and both the bottom surface 2112 and the inner peripheral surface 2113 of the insertion slot 241 are located inside the battery cell 20.

[0162] In an embodiment of the present application, the pole column body 230 and the second pole column 24 are recessed from the respective first side wall 251 into the battery cell 20 to form an insertion slot 241, so that the electrical connection member 30 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 member 30 is relatively stable.

[0163] Please refer to Figure 26 , in some embodiments, the pole column body 230 and the second pole column 24 are both provided with insertion portions 231, and insertion slots 241 are respectively formed at both ends of the electrical connection member 30; one of the two insertion slots 241 is inserted into the insertion portion 231 of the pole column body 230, and the other of the two insertion slots 241 is configured to be inserted into the insertion portion 231 of the second pole column 24 of the adjacent battery cell 20.

[0164] Optionally, the pole column body 230 has a first base 232, the second pole column 24 has a second base 242, the insertion portion 231 on the pole column body 230 protrudes relative to the first base 232, and the insertion portion 231 on the second pole column protrudes relative to the second base 242. The insertion slot 241 is a groove adapted to the insertion portion 231, and the insertion slot 241 is recessed inward on the surface of the electrical connection member 30. The top end of the protruding insertion portion 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 pole column part is arranged on the front and back sides of the battery cell 20, and the insertion portion 231 protrudes along the first direction, and the insertion slot 241 is recessed along the first direction.

[0165] Optionally, the electrical connection member 30 is a long prismatic structure, the insertion slot 241 extends along the length direction of the electrical connection member 30 to form a long rectangular slot, and the insertion portion 231 forms a long strip-shaped protrusion matching the size of the insertion slot 241. Optionally, the insertion slot 241 is a dovetail groove (not shown in the figure).

[0166] In the embodiments of the present application, the electrical connection between the pole body 230, the electrical connector 30 and the second pole 24 is achieved by inserting the insertion part 231 into the insertion slot 241. The operation is relatively simple and the connection is relatively stable. At the same time, the two battery cells 20 with completed electrical connection can avoid 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.

[0167] Please refer to Figure 26 , in some embodiments, both the pole body 230 and the second pole 24 protrude from the respective first side wall 251 where they are located to directly form the insertion part 231; alternatively, both the pole body 230 and the second pole 24 are recessed relative to the respective first side wall 251 where they are located, and an insertion part 231 smaller than the size of the groove protrudes at the recessed position.

[0168] In one example, the pole body 230 and the second pole 24 protrude from the respective first side wall 251 where they are located to the outside of the battery cell 20, and the part of the pole protruding from the surface of the battery cell 20 forms the insertion part 231, and the insertion part 231 is located outside the battery cell 20.

[0169] In the embodiments of the present application, the pole body 230 and the second pole 24 protrude from the respective first side wall 251 where they are located, thereby reducing the influence of the damage of the pole assembly 21 on the internal structures such as the electrode assembly 26 of the battery cell 20. In addition, it is convenient for molding and assembly in the case where the pole assembly 21 and the battery cell 20 are integrally formed.

[0170] In another example, the pole body 230 and the second pole 24 are recessed from the respective first side wall 251 where they are located into the battery cell 20, and the bottom walls of the pole body 230 and the second pole 24 after recessing protrude in the direction away from the battery cell 20 to form the insertion part 231. The protruding depth of the insertion part 231 is less than or equal to the recessing depth of the pole body 230 and the second pole 24. The insertion part 231 is located inside the battery cell 20 and is arranged in the recessed area formed by the pole body 230 and the second pole 24. The electrical connector 30 can be partially inserted into the recessed area of the pole body 230 and the second pole 24 and engage with the insertion part 231 inside the battery cell 20 to accommodate the insertion part 231 in the insertion slot 241.

[0171] In the embodiments of the present application, the pole body 230 and the second pole 24 are recessed from the respective first side wall 251 where they are located into the battery cell 20, so that the electrical connector 30 is directly inserted into the inside of the surface of the battery cell 20, and the insertion part 231 and the insertion slot 241 are inserted inside the surface of the battery cell 20, thereby reducing external interference and improving the connection reliability between the electrical connector 30 and the battery cell 20.

[0172] Please refer to Figure 3, Figure 6 and Figure 7 , in some embodiments, the electrode assembly 26 includes a main body portion 261 and a tab portion 262 connected to an end of the main body portion 261. The first sidewall 251 includes a first region 2511 covering the main body portion 261 and a second region 2512 covering the tab portion 262. The second region 2512 is close to an edge of the first sidewall 251. The first pole column 23 and the second pole column 24 are disposed in the second region 2512 and are electrically connected to the tab portion 262.

[0173] Specifically, the electrode assembly 26 is a component in the battery cell 20 where an electrochemical reaction occurs. The housing 25 may contain one or more electrode assemblies 26. The electrode assembly 26 is mainly formed by winding or stacking a positive electrode plate and a negative electrode plate, and generally, a separator is disposed between the positive electrode plate and the negative electrode plate. The portions of the positive electrode plate and the negative electrode plate having active materials constitute the main body portion 261 of the electrode assembly 26, and the portions of the positive electrode plate and the negative electrode plate not having active materials respectively constitute the tab portions 262. The positive electrode tab and the negative electrode tab may be commonly located at one end of the main body portion 261 or respectively located at two ends of the main body portion 261. During charge and discharge, the positive active material and the negative active material react with the electrolyte solution, and the tab portion 262 is connected to the pole column assembly 21 to form a current loop.

[0174] The housing 25 forms a receiving space, the electrode assembly 26 is received in the receiving space, and the first sidewall 251 and other sidewalls of the housing 25 surround the electrode assembly 26. The first sidewall 251 covers the electrode assembly 26 in a first direction, the first region 2511 covers the main body portion 261 along the first direction, and the second region 2512 covers the tab portion 262 along the first direction. Since the active material and the electrolyte solution repeatedly perform oxidation-reduction reactions during charge and discharge, the main body portion 261 is likely to release gas, causing the housing 25 to easily expand. The degree of expansion and deformation of the first sidewall 251 in the first region 2511 is significantly greater than that of the second sidewall.

[0175] In the embodiment of the present application, 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 expansion and deformation of the first sidewall 251 in the first region 2511 are relatively large. The first pole column 23 and the second pole column 24 are disposed in the second region 2512, so that the pole column assembly 21 is less affected by the expansion of the electrode assembly 26. In addition, the pole column assembly 21 is disposed close to the edge of the first sidewall 251, improving the high-voltage protection performance during assembly, maintenance, etc.

[0176] Please refer to Figures 3 to 7 , in some embodiments, the main body portion 261 includes wound or stacked electrode plates, and the electrode plates are coated with an active material layer (not shown in the figure) to generate electric energy. The region of the electrode plate coated with the active material layer is directly opposite to the first region 2511 in the first direction.

[0177] Specifically, the active material layer is coated on the pole piece and is spaced from the pole ear 262 by a small distance at the edge where the pole ear 262 of the pole piece 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 may be parallel to the active material layer in the first region 2511, and the plane of the first region 2511 and the plane where the active material layer is located may both be perpendicular to the first direction.

[0178] In the embodiment of the present application, the region 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.

[0179] Please refer to Figures 4 to 7 , in some embodiments, 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 left and right direction as shown in the figure), 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.

[0180] Optionally, in combination with Figure 4 and Figure 6 , in an example, the first direction is Figure 6 the direction perpendicular to the paper surface in

[0181] Optionally, in combination with Figure 5 and Figure 7 , in an example, the first direction is Figure 7In a direction perpendicular to the paper plane, the housing 25 is in the shape of a cuboid. The first side wall 251 is one of the two side wall surfaces with the largest area on the cuboid-shaped housing 25. The long side 2514 of the first side wall 251 has the longest side length of the housing 25, and the short side 2513 of the first side wall 251 has the side length that is second only to the long side 2514 on the housing 25. The first pole column 23 and the second pole column 24 are arranged close to the short side 2513, and the length extension direction of the first pole column 23 and the second pole column 24 is also the length direction of the housing 25. On the same first side wall 251, the two pole column assemblies 21 (if any) are respectively arranged close to the two short sides 2513.

[0182] The mortise and tenon connection of the pole column assembly 21 in the first direction (the front-back direction as shown in the figure) improves the space utilization rate in the up-down direction.

[0183] In the embodiment of the present application, the pole column assembly 21 extends in a strip shape along the length direction of the adjacent short side 2513 or long side 2514, 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 connection of the pole column assembly 21.

[0184] Please refer to Figures 12 to 22 , in some embodiments, the battery cell 20 includes an elastic electrical connection member 22. The elastic electrical connection member 22 is arranged on the first pole column 23 and / or the second pole column 24, and the elastic electrical connection member 22 is used for elastically abutting between the first pole column 23 and the second pole column 24 of another adjacent battery cell 20 when the first pole column 23 is inserted into the second pole column 24, so as to realize the electrical connection of two adjacent battery cells 20.

[0185] Specifically, the elastic electrical connection member 22 includes but is not limited to an elastic reed. For the convenience of description, the present application takes the example that the first pole column 23 is formed with a plug-in portion 231 and the second pole column 24 is formed with a plug-in groove 241.

[0186] Optionally, please combine Figures 12 to 16 , the battery cell 20 provided with the plug-in groove 241 has an elastic electrical connection member 22. The elastic electrical connection member 22 can be located in the plug-in groove 241 and connected to the surface of the second pole column 24 facing the plug-in groove 241.

[0187] Optionally, please combine Figure 22 , in one embodiment, the battery cell 20 provided with the plug-in portion 231 has an elastic electrical connection member 22, and the elastic electrical connection member 22 can be arranged on the plug-in portion 231.

[0188] In the embodiment of the present application, the elastic electrical connector 22 elastically abuts between the insertion part 231 of one battery cell 20 and the insertion slot 241 of another adjacent battery cell 20. The elastic electrical connector 22 can keep the insertion part 231 and the insertion slot 241 in full contact under static and dynamic conditions such as vibration and shock, thereby improving to a certain extent the electrical contact area between the two pole assemblies 21, reducing the overcurrent impedance and heat generation problems, enhancing the electrical connection reliability between two adjacent battery cells 20, and reducing or avoiding safety problems.

[0189] According to some embodiments of the present application, optionally, the elastic electrical connectors 22 are distributed along the circumferential direction of the pole assembly 21.

[0190] Optionally, in one embodiment, please refer to Figure 12 and Figure 13 , the elastic electrical connector 22 is arranged on the surface of the second pole 24 facing the insertion slot 241. The elastic electrical connector 22 is located within the insertion slot 241 and is distributed along the circumferential direction of the second pole 24, and can connect the insertion part 231 on the circumferential surface of the second pole 24 facing the insertion slot 241, improving to a certain extent the connection area between the first pole 23 and the second pole 24.

[0191] Optionally, in one embodiment, please refer to Figure 22 , the elastic electrical connector 22 can be arranged on the insertion part 231 and is distributed along the circumferential direction of the first pole 23, so as to connect the surface of the second pole 24 facing the insertion slot 241 on the circumferential surface of the insertion part 231, improving to a certain extent the connection area between the first pole 23 and the second pole 24.

[0192] Optionally, in one embodiment, the elastic electrical connector 22 can be an integral ring structure and is distributed along the circumferential direction of the pole assembly 21. Optionally, in one embodiment, a plurality of elastic electrical connectors 22 can be distributed along the circumferential direction of the pole assembly 21.

[0193] In the embodiment of the present application, the elastic electrical connectors 22 are distributed along the circumferential direction of the pole assembly 21, which can improve to a certain extent the connection area between the first pole 23 and the second pole 24.

[0194] According to some embodiments of the present application, optionally, the elastic electrical connector 22 includes a first end 221 and a second end 222. The first end 221 is fixedly connected to the pole assembly 21, and the second end 222 is movable.

[0195] Optionally, in one embodiment, please refer to Figures 12 to 16, the battery cell 20 provided with the insertion slot 241 has an elastic electrical connector 22, 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 is movable. Optionally, in one embodiment, please refer to Figure 22 , the battery cell 20 having the insertion portion 231 has an elastic electrical connector 22, one end of the elastic electrical connector 22 is fixedly connected to the insertion portion 231, and the second end 222 is movable.

[0196] In the embodiment of the present application, when the first pole 23 and the second pole 24 are assembled, the insertion portion 231 is inserted into the insertion slot 241. The first end 221 of the elastic electrical connector 22 is fixedly connected to the pole assembly 21, and the second end 222 is movable, so that the second end 222 of the elastic electrical connector 22 can move when being squeezed, and the elastic electrical connector 22 is easy to deform, which can avoid damaging the elastic electrical connector 22 to a certain extent and reduce the assembly resistance.

[0197] According to some embodiments of the present application, optionally, the pole assembly 21 is provided with a groove 211, and the battery pack 30 is configured such that when the elastic electrical connector 22 is deformed during the assembly of the first pole 23 and the second pole 24, the second end 222 is inserted into the groove 211 to release the stress of the elastic electrical connector 22.

[0198] Optionally, in one embodiment, please refer to Figures 12 to 16 , the battery cell 20 provided with the insertion slot 241 has an elastic electrical connector 22, the elastic electrical connector 22 is disposed on the circumferential surface of the second pole 24 facing the insertion slot 241, and the circumferential surface of the second pole 24 facing the insertion slot 241 is provided with a groove 211. Optionally, in one embodiment, please refer to Figure 22 , the battery cell 20 having the insertion portion 231 has an elastic electrical connector 22, and the elastic electrical connector 22 and the groove 211 are disposed on the circumferential surface of the insertion portion 231.

[0199] The shape of the groove 211 includes but is not limited to regular shapes such as rectangles and circles or irregular shapes.

[0200] In the embodiment of the present application, during the assembly of the first pole 23 and the second pole 24, when the elastic electrical connector 22 is deformed by the extrusion of the insertion portion 231 and the second pole 24, the second end 222 moves to insert into the groove 211 to release the stress of the elastic electrical connector 22, which can avoid the situation that the elastic electrical connector 22 is damaged due to excessive extrusion to a certain extent.

[0201] Optionally, please refer to Figure 17 and Figure 18, the insertion part 231 protrudes from the housing 25. Along the protruding direction of the insertion part 231, the second end 222 and the first end 221 are arranged in sequence.

[0202] In the figure, the protruding direction of the insertion part 231 is from the back to the front. Along the direction from the back to the front, the second end 222 and the first end 221 are arranged in sequence.

[0203] Along the protruding direction of the insertion part 231, the second end 222 and the first end 221 are arranged in sequence, so that the first end 221 is closer to the outer side of the housing 25 than the second end 222. When the first pole column 23 and the second pole column 24 are assembled, the insertion part 231 is inserted into the insertion slot 241. The second pole column 24 first presses the first end 221. As the assembly progresses, the second pole column 24 presses the middle position of the elastic electrical connector 22, so that the second end 222 moves towards the housing 25, making it easier for the second end 222 to be flattened and enter the groove 211 (if any), reducing the resistance during assembly, avoiding damaging the elastic electrical connector 22 to a certain extent, and being beneficial to improving the assembly efficiency.

[0204] Please refer to Figures 3 to 5 , in some embodiments, the battery cell 20 includes a pressure relief mechanism 254. The pressure relief mechanism 254 is disposed 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.

[0205] Optionally, the pressure relief mechanism 254 forms a local wall thickness relatively shallower than the overall wall thickness on the housing 25 other than the first side wall 251 through scoring, grooves, etc. As Figure 3 shown, the pressure relief mechanism 254 is disposed on the cover 253 of the battery cell 20.

[0206] Optionally, the first side wall 251 is located on the front and rear sides of the battery cell 20. The pressure relief mechanism 254 can be disposed on one of the left, right, upper, and lower side surfaces of the housing 25.

[0207] In the embodiments of the present application, the pressure relief mechanism 254 is disposed 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, releasing 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.

[0208] In some embodiments, the housing 25 is provided with a mounting hole (not shown in the figures). The entire pole assembly 21 is covered outside the mounting hole (not shown in the figures), or a part of the pole assembly 21 is covered outside the mounting hole (not shown in the figures), and a part of the pole assembly 21 passes through the mounting hole (not shown in the figures) and extends into the housing 25 to cooperate with the housing 25.

[0209] Specifically, the shape of the mounting hole (not shown in the figures) can match the cross-sectional shape of the pole assembly 21. For example, if the pole assembly 21 is in a long strip shape, the mounting hole (not shown in the figures) is also in a long strip runway shape with similar or the same size. If the entire pole assembly 21 is covered outside the mounting hole (not shown in the figures), then the entire pole assembly 21 is located outside the housing 25. When a part of the pole assembly 21 extends into the mounting hole (not shown in the figures), the part of the pole assembly 21 extending into the mounting hole (not shown in the figures) can be fastened to the housing 25 and connected to the electrode assembly 26.

[0210] Covering the entire pole assembly 21 outside the mounting hole (not shown in the figures) facilitates the assembly of the pole 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 first pole 23 and the housing 25, such that after the first pole 23 cooperates with the housing 25, it is not likely to break away from the housing 25 due to vibration or external pulling during the charge and discharge process of the battery cell 20, nor is it likely to crack or be damaged due to vibration or external pulling.

[0211] Covering a part of the pole assembly 21 outside the mounting hole (not shown in the figures) and extending a part of it through the mounting hole (not shown in the figures) into the housing 25 to cooperate with the housing 25 is beneficial to improving the electrical connection stability and overcurrent capacity between the pole assembly 21 and the electrode assembly 26 inside the housing 25.

[0212] Please refer to Figure 3 , in some embodiments, 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 assembly 21 is disposed on either the housing body 252 or the cover body 253.

[0213] 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 likely to deform when being squeezed or collided, enabling the battery cell 20 to have a higher structural strength and the safety performance can also be improved.

[0214] 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 electrical 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., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating member can also be disposed inside the cover body 253. The insulating member can be used to isolate the electrical connection components inside 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.

[0215] 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.

[0216] 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 covers the opening 2521 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 first form a common connection surface before other components enter the housing. When it is necessary to encapsulate the inside of the housing body 252, the cover body 253 is then made to cover the housing body 252.

[0217] In the embodiment of the present application, the housing body 252 has an opening 2521, and the cover body 253 seals and covers the opening 2521; the pole column assembly 21 is disposed 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.

[0218] Optionally, referring to Figure 27 and Figure 28 , the outer shell 25 is formed with a receiving groove 257. The receiving groove 257 is located on the two opposite side surfaces of the battery cell 20 along the first direction, that is, on the two first side walls 251. The receiving groove 257 is recessed into the battery cell 20 relative to the surface of the battery cell 20 where it is located. The receiving groove 257 is used to receive the pole column assembly 21. The first pole column 23 and the second pole column 24 of two adjacent battery cells 20 along the first direction are inserted into each other in the receiving groove 257. The receiving groove 257 can be located at the end of the outer shell 251. Exemplarily, the first side wall 251 is rectangular, and the receiving groove 257 is formed at the two diagonals of the first side wall 251.

[0219] It can be understood that in this embodiment, the first direction is Figure 27 the up-and-down direction in Figure 28The direction perpendicular to the paper surface. In combination with Figure 2 , the accommodation groove 257 is recessed on the surface of the battery cell 20 and is used to accommodate the pole assembly 21 and the electrical connection column 30. Thus, when two adjacent battery cells 20 are connected, the pole assembly 21 and the electrical connection column 30 are accommodated in the accommodation 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.

[0220] Optionally, referring to Figure 27 and Figure 28 , 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 height dimension of the battery cell 20. The pole assembly 21 can extend 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 assembly 21 is smaller than that in the state of extending along the length direction of the battery cell 20, and the pole assembly 21 is a short and flat structure. The pole assembly 21 is formed with a protruding insertion part (not shown in the figure) or an inwardly recessed insertion groove 392 to be inserted into the pole assembly 21 of another battery cell 20 in the accommodation groove 257.

[0221] In a second aspect, an embodiment of the present application provides a battery device 100. The battery device 100 includes the battery cell 20 of any one of the above embodiments. The two first side walls 251 of the battery cell 20 are opposite to each other in the first direction, and the number of the battery cells 20 is multiple and arranged in the first direction.

[0222] In the battery device 100 of the technical solution of the present application, by arranging the pole assembly 21 on the first side wall 251 with the largest area in the battery cell 20, the area of the pole assembly 21 can be increased, thereby increasing the overcurrent area of the electrical connection of the battery cell 20 and ensuring the fast charging performance. At the same time, since the battery cell 20 expands during use, and the first side wall 251 with the largest area has a relatively large expansion force compared with other side walls, the insertion stability of the pole assembly 21 between the first side walls 251 is better. In addition, by the mutual insertion connection of the first pole 23 and the second pole 24, it is also beneficial to the repeated cascade utilization of the battery cell 20 and improves the maintainability of the battery.

[0223] Please refer to Figure 5 , in some embodiments, the battery device 100 includes an adapter (not shown in the figure). A plurality of battery cells 20 are arranged in the first direction to form a plurality of battery groups 30, and the plurality of battery groups 30 are arranged in the second direction. Among two adjacent battery groups 30 in the second direction, one of the battery cells 20 at the head and tail ends in the first direction is connected to the adapter (not shown in the figure) to realize the electrical connection between two adjacent battery groups 30.

[0224] Optionally, inFigure 2 In this case, the first direction is the front - rear direction, the second direction is the left - right direction, and the third direction is the up - down 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 30. A plurality of battery packs 30 are arranged along the second direction. In the first direction, the two pole assemblies 21 of two adjacent battery cells 20 are connected, so as to realize the electrical connection within one battery pack 30. Optionally, in the same battery pack 30, two adjacent battery cells 20 are connected in series.

[0225] Optionally, in Figure 2 In this case, the battery device 100 includes four battery packs 30, and the four battery packs 30 are arranged in a 2×2 manner. The number of battery cells 20 in each battery pack 30 can be the same or different. The battery packs 30 can be connected in series, in parallel or in a hybrid connection.

[0226] Optionally, the adapter (not shown in the figure) is a block - shaped, plate - shaped, strip - shaped or sheet - shaped structure made of metal. For example, the adapter (not shown in the figure) can be a copper bar, a copper row, etc.

[0227] In the embodiment of the present application, the adapter (not shown in the figure) is connected to the front end or the tail end of two adjacent battery packs 30 in the first direction, so as to realize the electrical connection between two adjacent battery packs 30 and improve the grouping efficiency of the battery device 100.

[0228] In some embodiments, the adapter (not shown in the figure) is formed with a second insertion groove (not shown in the figure) or a second insertion portion (not shown in the figure) and is inserted into the battery cell 20.

[0229] Specifically, a plug - in groove 241 and / or a plug - in portion 231 can be formed on the first side wall 251 on the front side of the battery cell 20 at the forefront of the battery pack 30 in the first direction. Correspondingly, the adapter (not shown in the figure) is formed with a second plug - in groove (not shown in the figure) for plugging, and / or the adapter (not shown in the figure) is formed with a second plug - in portion (not shown in the figure) for plugging into the plug - in groove 241. A plug - in groove 241 and / or a plug - in portion 231 can be formed on the first side wall 251 on the rear side of the battery cell 20 at the last one of the battery pack 30 in the first direction. Correspondingly, the adapter (not shown in the figure) is formed with a second plug - in groove (not shown in the figure) for plugging, and / or the adapter (not shown in the figure) is formed with a second plug - in portion (not shown in the figure) for plugging into the plug - in groove 241.

[0230] In the embodiment of the present application, the adapter (not shown in the figure) is inserted into the battery cell 20 through the second plug - in groove (not shown in the figure) or the second plug - in portion (not shown in the figure), so as to realize the electrical connection between the adapter (not shown in the figure) and the battery cell 20 and ensure better electrical connection stability.

[0231] Please refer to Figures 23 to 24, in some embodiments, the battery device 100 includes a sampling member 41 which directly contacts the terminal assembly 21 to collect parameter information of at least one of two adjacent battery cells 20.

[0232] Optionally, the sampling member 41 collects parameter information of the battery cell 20 where the directly contacted terminal assembly 21 is located. In another example, two adjacent battery cells 20 arranged in the first direction are electrically connected by plugging two terminal assemblies 21, and the sampling member 41 abuts against the two mutually plugged terminal assemblies 21 to collect parameter information of the two mutually plugged terminal assemblies 21.

[0233] Optionally, the sampling member 41 may be a voltage sampling structure of the battery cell 20 to sample the voltage information of the battery cell 20 by directly contacting the terminal assembly 21. The sampling member 41 is a contact electrical connection structure.

[0234] In the embodiments of the present application, the sampling member 41 directly contacts the terminal assembly 21, improving the accuracy and synchronization of collecting parameter information of the battery cell 20.

[0235] In some embodiments, the contact manner between the sampling member 41 and the terminal assembly 21 includes at least one of the following:

[0236] The sampling member 41 contacts at least one of the first terminal 23 and the second terminal 24 connected in the axial direction L of the terminal assembly 21;

[0237] The sampling member 41 contacts at least one of the first terminal 23 and the second terminal 24 connected in the circumferential direction of the terminal assembly 21;

[0238] The sampling member 41 contacts at least one of the first terminal 23 and the second terminal 24 connected in the radial direction D of the terminal assembly 21.

[0239] In Figures 23 to 24 , the circumferential direction of the terminal assembly 21 is the direction around the axial direction L of the terminal assembly 21, the radial direction D of the terminal assembly 21 may be perpendicular to the axial direction L of the terminal assembly 21, the first direction may be parallel to the axial direction L of the terminal assembly 21, or the first direction may coincide with the axial direction L of the terminal assembly 21.

[0240] The contact manner between the sampling member 41 and the terminal assembly 21 includes at least one of the following:

[0241] The sampling member 41 contacts at least one of the first terminal 23 and the second terminal 24 connected in the axial direction L of the terminal assembly 21 (hereinafter referred to as contact manner one), as Figure 23 shown;

[0242] The sampling member 41 contacts at least one of the connected first pole 23 and second pole 24 in the circumferential direction of the pole assembly 21 (hereinafter referred to as contact mode two), as Figure 24 shown;

[0243] The sampling member 41 contacts at least one of the connected first pole 23 and second pole 24 in the radial direction D of the pole assembly 21 (hereinafter referred to as contact mode three).

[0244] In one embodiment, the contact mode between the sampling member 41 and the pole assembly 21 is contact mode one. In contact mode one, the sampling member 41 can contact one of the first pole 23 and the second pole 24 in the axial direction L of the pole assembly 21, or can contact both the first pole 23 and the second pole 24. Contact mode one can be applied to install the sampling member 41 in scenarios where the space in the circumferential and radial directions D of the pole assembly 21 is small and the space in the axial direction L of the pole assembly 21 is large, including but not limited to such scenarios.

[0245] In one embodiment, the contact mode between the sampling member 41 and the pole assembly 21 is contact mode two. In contact mode two, the sampling member 41 can contact one of the first pole 23 and the second pole 24 in the circumferential direction of the pole assembly 21, or can contact both the first pole 23 and the second pole 24. Contact mode two can be applied to install the sampling member 41 in scenarios where the space in the axial direction L and the radial direction D of the pole assembly 21 is small and the space in the circumferential direction of the pole assembly 21 is large, including but not limited to such scenarios.

[0246] In one embodiment, the contact mode between the sampling member 41 and the pole assembly 21 is contact mode three. In contact mode three, the sampling member 41 can contact one of the first pole 23 and the second pole 24 in the radial direction D of the pole assembly 21, or can contact both the first pole 23 and the second pole 24. Contact mode three can be applied to install the sampling member 41 in scenarios where the space in the circumferential direction and the axial direction L of the pole assembly 21 is small and the space in the radial direction D of the pole assembly 21 is large, including but not limited to such scenarios.

[0247] In one embodiment, the contact modes between the sampling part 41 and the pole column assembly 21 include contact mode one and two. Optionally, the sampling part 41 can be in contact with 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 in contact with 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 part 41 can be in contact with 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 in contact with 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 part 41 can be in contact with 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 in contact with 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.

[0248] In one embodiment, the contact modes between the sampling part 41 and the pole column assembly 21 include contact mode one and three. Optionally, the sampling part 41 can be in contact with one of the pole column assemblies 21 in the axial direction L of the pole column assembly 21, and in contact with the other pole column assembly 21 in the radial direction D of the pole column assembly 21. Optionally, the sampling part 41 can be in contact with one of the pole column assemblies 21 in the axial direction L and the radial direction D of the pole column assembly 21, and in contact with the other pole column assembly 21 in the axial direction L and the radial direction of the pole column assembly 21. Optionally, the sampling part 41 can be in contact with one of the pole column assemblies 21 in the radial direction D of the pole column assembly 21, and in contact with the other pole column assembly 21 in the axial direction L and the radial direction D of the pole column assembly 21.

[0249] In one embodiment, the contact modes between the sampling part 41 and the pole column assembly 21 include contact mode two and three. Optionally, the sampling part 41 can be in contact with one of the pole column assemblies 21 in the circumferential direction of the pole column assembly 21, and in contact with the other pole column assembly 21 in the radial direction D of the pole column assembly 21. Optionally, the sampling part 41 can be in contact with one of the pole column assemblies 21 in the circumferential direction and the radial direction D of the pole column assembly 21, and in contact with the other pole column assembly 21 in the circumferential direction and the radial direction D of the pole column assembly 21. Optionally, the sampling part 41 can be in contact with one of the pole column assemblies 21 in the radial direction D of the pole column assembly 21, and in contact with the other pole column assembly 21 in the circumferential direction and the radial direction D of the pole column assembly 21.

[0250] In one embodiment, the contact modes between the sampling part 41 and the pole column 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 is made here.

[0251] In the embodiments of the present application, the sampling member 41 can contact the pole assembly 21 in at least one direction 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 methods of the pole assembly 21. The arrangement of the sampling member 41 is more flexible, and to a certain extent, alleviates the space limitation on the sampling member 41.

[0252] Optionally, the material of the sampling member 41 includes but is not limited to nickel and copper. Optionally, the sampling member 41 is connected to the output line 42, and the setting of the output line 42 can facilitate the transmission of the electrical information of the battery cell 20 to the control unit, such as the control unit for voltage sampling.

[0253] In some embodiments, multiple battery cells 20 are connected in series. In other embodiments, multiple battery cells 20 are connected in parallel. In other embodiments, multiple battery cells 20 have both series and parallel connections. In the embodiments of the present application, diverse connection methods can be realized inside the battery device 100, thereby completing relatively complex functional designs.

[0254] In the first direction, the electrical connection method between two adjacent battery cells 20 can be a series connection or a parallel connection. When the electrical connection method between two adjacent battery cells 20 is a series connection, the two connected pole assemblies 21 are opposite-sex pole assemblies, that is, one is a positive pole assembly and the other is a negative pole assembly. When the electrical connection method between two adjacent battery cells 20 is a parallel connection, the two connected pole assemblies 21 are same-sex pole assemblies, that is, both are positive pole assemblies or both are negative pole assemblies.

[0255] According to some embodiments of the present application, embodiments of the present application provide an electrical device, the electrical device includes the battery device 100 of any of the above embodiments, the battery device 100 is used to provide electrical energy, or the battery cell 20 of any of the above embodiments, the battery cell 20 is used to provide electrical energy.

[0256] The electrical device can be any of the foregoing devices or systems that apply the battery device 100.

[0257] In some embodiments, the electrical device is a vehicle, the battery device 100 includes a box body 10, and multiple battery cells 20 are arranged in the box body 10; at least a part of the chassis of the vehicle constitutes the upper cover of the box body 10.

[0258] The battery device of this embodiment can form a CTB (Cell To Body) solution.

[0259] Optionally, in one embodiment, please combine Figure 2, the first part 11 can serve as the upper cover of the box body 10, and the first part 11 can form the chassis of the vehicle. In one embodiment, the first part 11 can be covered on the opening side of the second part 12 so that the first part 11 and the second part 12 jointly define a closed space. Optionally, in one embodiment, both the first part 11 and the second part 12 can also be hollow structures with openings on one side, and the opening side of the first part 11 is covered on the opening 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.

[0260] Optionally, in one embodiment, a notch can be formed in the chassis of the vehicle, and the battery device 100 is loaded into the notch with the first part 11 facing the direction of the chassis of the vehicle, so that the battery device 100 is assembled to the vehicle, and the first part 11 constitutes a part of the chassis of the vehicle.

[0261] In some embodiments, the battery device 100 further includes a box body 10, a first expansion beam 13 and a second expansion beam 14; the first expansion beam 13 and the second expansion beam 14 are arranged at intervals, and the two jointly enclose a battery compartment 15 with the box body 10, and a plurality of battery cells 20 are arranged in sequence in the battery compartment 15, and the battery cells 20 at the ends are respectively matched with the first expansion beam 13 and the second expansion beam 14.

[0262] The battery device 100 of this embodiment can form a CTP (Cell To Pack) solution. The battery device 100 of the CTP solution in this embodiment, compared with the battery device 100 of the MTP (Module To Pack) solution, can reduce the structural parts required to fix the battery modules, improve the space utilization rate in the box body 10, so that in the case of a box body 10 of the same size, the number of battery cells 20 in the box body 10 can be increased, and thus the energy density of the battery device 100 can be increased.

[0263] Optionally, in Figure 2 it, the first expansion beam 13 and the second expansion beam 14 are arranged at intervals and the two jointly enclose two battery compartments 15 with the box body 10. A plurality of battery cells 20 are connected in a row along the first direction (such as Figure 2 the front-back direction), and two rows of battery packs are respectively arranged in the two battery compartments 15 along the second direction (such as Figure 2 the left-right direction). It can be understood that in other embodiments, the number of rows of the battery packs includes but is not limited to one row or more than two rows.

[0264] The first expansion beam 13 and the second expansion beam 14 can be arranged at both ends of the battery pack along the first direction, in Figure 2In it, the first expansion beam 13 and the second expansion beam 14 are respectively arranged at the front end and the rear end of a row of battery packs. The battery cell 20 located at the front end of the battery pack cooperates with the first expansion beam 13, and the battery cell 20 located at the rear end of the battery pack cooperates with the second expansion beam 14. Thus, the first expansion beam 13 and the second expansion beam 14 restrain a row of battery packs in the front-rear direction (the first direction).

[0265] Optionally, in Figure 2 it, the first expansion beam 13 cooperates with the wall surface with the largest area on the housing of the battery cell 20 located at the front end, and the second expansion beam 14 cooperates with the wall surface with the largest area on the housing of the battery cell 20 located at the rear end. During the operation of the battery cell 20, as the electrode assembly releases gas, the expansion amount of the wall surface with the largest area on the housing is greater than that of other wall surfaces of the housing. By respectively cooperating the first expansion beam 13 and the second expansion beam 14 with the wall surface with the largest area on the housing of the battery cell 20 located at the end, it is possible to avoid, to a certain extent, the wall surface with the largest area on the housing from cracking due to excessive expansion amount, and the safety of the battery device 100 is improved.

[0266] Optionally, the battery device 100 further includes a cross beam 16 and a longitudinal beam 17. The cross beam 16 connects two side plates (such as the left side plate and the right side plate) of the box body 10 along the second direction, and the longitudinal beam 17 connects the first expansion beam 13 and the second expansion beam 14 arranged along the first direction. The cross beam 16 connects the longitudinal beam 17, thereby improving the structural strength of the box body 10. The number of the cross beam 16 and the longitudinal beam 17 in this application is not specifically limited. In Figure 2 it, the number of both the cross beam 16 and the longitudinal beam 17 is one, and one cross beam 16 and one longitudinal beam 17 are connected, thereby increasing the structural strength of the box body 10.

[0267] Thus, the battery cells 20 located at the ends respectively cooperate with the first expansion beam 13 and the second expansion beam 14, so that the first expansion beam 13 and the second expansion beam 14 can restrain the battery cells 20 when the battery cells 20 expand.

[0268] According to some embodiments of the present application, optionally, the battery device 100 further includes a box body 10, a module housing (not shown in the figure) and a mounting beam (not shown in the figure). A plurality of battery cells 20 are arranged in the module housing, and the module housing is mounted in the box body 10 through the mounting beam.

[0269] The battery device 100 of this embodiment can form an MTP (Module To Pack) solution.

[0270] Optionally, a plurality of battery cells 20 are disposed within a module housing, so as to form a battery module, and one or more battery modules can be placed within the box body 10. The plurality of battery modules can be connected in series, in parallel, or in a series-parallel combination. The plurality of battery cells 20 within one module housing can be connected in series, in parallel, or in a series-parallel combination.

[0271] The mounting beam can be fixed within the box body 10 and connected to the module housing so as to fix the battery module within the box body 10. The fixing methods can include but are not limited to welding, bolt connection, etc.

[0272] Optionally, in one embodiment, the module housing can be in a frame-like structure, such as a square frame-like structure. The plurality of battery cells 20 are located in the space defined by the frame-like structure. Optionally, in one embodiment, the module housing can include a tie strap (such as a steel strap), and the tie strap can bundle and fix the plurality of battery cells 20.

[0273] The module housing is mounted within the box body 10 through the mounting beam, so that the plurality of battery cells 20 can be assembled into a battery module, and then the battery module is fixed within the box body 10 through the mounting beam.

[0274] In the electrical device of the technical solution of the present application, the pole assembly 21 is disposed on the first side wall 251 with the largest area of the battery cell 20, and the electrical connection area between the two pole assemblies 21 can also be increased to maintain a large over-current capacity, thereby improving to a certain extent the fast charging performance of the battery cell 20, the battery device 100 using the battery cell 20, and the electrical device.

[0275] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it; 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 described 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 within 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 falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The housing has two first side walls facing each other, the area of the first side walls is larger than the area of the other side walls, and the two first side walls are arranged facing each other along a first direction; an electrode assembly, disposed in the housing; The pole assembly includes a first pole and a second pole with opposite polarities, the first pole and the second pole are both electrically connected to the electrode assembly and are respectively arranged on the two first side walls, and the first pole is configured to be plugged into the second pole of another adjacent battery cell to electrically connect the two adjacent battery cells.

2. The battery cell according to claim 1, characterized in that, The first pole includes a plug-in portion, and the second pole is formed with a plug-in slot adapted to the plug-in portion; the plug-in portion can be directly plugged into the plug-in slot of another adjacent battery cell.

3. The battery cell according to claim 2, wherein, The plug-in portion protrudes from the first side wall where the first pole is located; the second pole is formed with a plug-in slot, and the plug-in slot is concave relative to the first side wall where the second pole is located.

4. The battery cell according to claim 2, wherein, The plug-in portion protrudes from the first side wall where the first pole is located, and the second pole protrudes from the first side wall where it is located. A plug-in slot is formed at the protruding end of the second pole. The plug-in slot is recessed toward the first side wall relative to the end of the second pole, and the depth of the recessed plug-in slot is less than or equal to the height of the second pole protruding from the first side wall.

5. The battery cell according to claim 2, characterized in that, The first pole of one battery cell is directly opposite to the second pole of another battery cell adjacent along the first direction along the first direction, and the battery cell is configured so that at least a portion of the plug-in portion is inserted into the plug-in slot of another battery cell adjacent along the first direction.

6. The battery cell according to claim 1, wherein, The first pole includes a pole body and an electrical connector plugged into the pole body. An end of the electrical connector facing away from the pole body is configured to be plugged into a second pole of another adjacent battery cell.

7. The battery cell according to claim 6, wherein, Both the pole body and the second pole are formed with an insertion slot; two insertion parts are formed at both ends of the electrical connector, one of the two insertion parts is inserted into the insertion slot of the pole body, and the other of the two insertion parts is inserted into the insertion slot of the second pole of the adjacent battery cell.

8. The battery cell according to claim 7, wherein The pole body and the second pole both protrude from the first side wall where they are located, and the protruding portions of the pole body and the second pole are respectively recessed toward the first side wall to form the insertion slots; or, The pole body and the second pole are both recessed inward relative to the first side wall where they are located, so as to directly form the insertion slot.

9. The battery cell according to claim 6, wherein, Both the pole body and the second pole are provided with a plug-in portion, and plug-in slots are formed at both ends of the electrical connector; one of the two plug-in slots is plugged into the plug-in portion of the pole body, and the other of the two plug-in slots is configured to be plugged into the plug-in portion of the second pole of the adjacent battery cell.

10. The battery cell according to claim 9, characterized in that, The pole body and the second pole are both protruded from the first side wall where they are located, so as to directly form the plug-in portion; or, The pole column body and the second pole column each recess relative to the corresponding first side wall where they are located, and a plugging part smaller than the size of the groove protrudes at the recessed position.

11. The battery cell according to any one of claims 1 to 10, characterized in that, The electrode assembly includes a main body part and a pole ear connected to an end of the main body part. The first side wall includes a first area covering the main body part and a second area covering the pole ear. The second area is close to an edge of the first side wall. The first pole column and the second pole column are arranged in the second area and are electrically connected to the pole ear.

12. The battery cell according to claim 11, characterized in that, The main body part includes wound or stacked pole pieces, and the pole pieces are coated with an active material layer to generate electric energy. An area of the pole piece coated with the active material layer faces the first area in the first direction.

13. The battery cell according to claim 11, characterized in that, The first side wall is square. The first side wall has 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 side is less than that of the long side. The second direction, the third direction, and the first direction are perpendicular to each other in pairs. The second area is arranged close to one of the short side and the long side. The first pole column and the second pole column extend along the length direction of the short side or the long side that the second area is close to and are strip-shaped.

14. The battery cell according to any one of claims 1 to 10, wherein The battery cell includes an elastic electrical connector. The elastic electrical connector is arranged on the first pole column and / or the second pole column. The electrical connector is used for elastically abutting between the first pole column and the second pole column of an adjacent battery cell when the first pole column is plugged into the second pole column of the adjacent battery cell, so as to realize electrical connection between two adjacent battery cells.

15. The battery cell according to claim 14, characterized in that, The elastic electrical connectors are distributed along the circumferential direction of the pole column assembly.

16. The battery cell according to claim 14, wherein, The elastic electrical connector includes a first end and a second end. The first end is fixedly connected to the first pole column or the second pole column, and the second end is movable relative to the first pole column or the second pole column to which it is connected.

17. The battery cell according to claim 16, wherein, The pole column assembly is provided with a groove. The battery cell is configured such that during the assembly process of the first pole column and the second pole column, when the elastic electrical connector is deformed, the second end is inserted into the groove to release the stress of the elastic electrical connector.

18. The battery cell according to claim 1, characterized in that, The battery cell includes a pressure relief mechanism. The pressure relief mechanism is arranged on a surface of the housing different from the first side wall. The pressure relief mechanism is used for cracking prior to the housing when the internal pressure of the battery cell exceeds a pressure threshold.

19. The battery cell according to claim 1, characterized in that, The housing is provided with a mounting hole, and the entire pole column assembly covers the outside of the mounting hole; Alternatively, a part of the pole column assembly covers the outside of 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.

20. The battery cell according to claim 19, wherein, 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 arranged on either the housing body or the cover body.

21. A battery device, characterized in that, The battery device includes: The battery cell according to any one of claims 1 - 20. Two first side walls of the battery cell are opposite to each other in a first direction, and the number of the battery cells is multiple and they are arranged in the first direction.

22. The battery device according to claim 21, wherein, The battery device includes an adapter. A plurality of the battery cells are arranged in the first direction to form a plurality of battery groups, and the plurality of battery groups are arranged in the second direction. Among two adjacent battery groups in the second direction, one of the battery cells at the head and tail ends in the first direction is connected to the adapter to achieve electrical connection between two adjacent battery groups.

23. The battery device according to claim 22, characterized in that, The adapter is formed with a second insertion groove or a second insertion portion and is inserted into the battery cell.

24. The battery device according to claim 21, wherein, The battery device includes a sampling member, and the sampling member directly contacts the pole assembly to collect parameter information of at least one of two adjacent battery cells.

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

26. The battery device according to claim 21, wherein, The battery device further includes a box body, a first expansion beam, and a second expansion beam; the first expansion beam and the second expansion beam are arranged at intervals, and the two of them and the box body jointly enclose a battery compartment. A plurality of the battery cells are sequentially arranged in the battery compartment, and the battery cells at the ends are respectively matched with the first expansion beam and the second expansion beam; Or, The battery device further includes a box body, a module housing, and a mounting beam. The plurality of battery cells are arranged in the module housing, and the module housing is mounted in the box body through the mounting beam.

27. An electrical device, characterized in that, Including the battery cell according to any one of claims 1-20, the battery cell is used to provide electrical energy; or, Including the battery device according to any one of claims 21-26, the battery device is used to provide electrical energy.

28. The electrical device according to claim 27, characterized in that, The electrical device is a vehicle, and the battery device includes a box body. A plurality of the battery cells are arranged in the box body; at least a part of the chassis of the vehicle constitutes the upper cover of the box body.

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