Battery monomer, battery device, power utilization device and energy storage device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device, a power utilization device and an energy storage device. The battery cell includes a housing having an accommodation space, the housing including a first housing wall; the electrode assembly is at least partially arranged in the accommodating space; and a first electrode terminal assembly and a second electrode terminal assembly which are provided on the first case wall, and in which a part of the first electrode terminal assembly and a part of the second electrode terminal assembly overlap and abut each other in a direction perpendicular to the thickness direction of the first case wall. The electrode terminal assembly of the battery monomer in the embodiment of the utility model has relatively high torsion resistance. According to the battery device, the power utilization device and the energy storage device, the battery monomer is adopted, so that the battery device, the power utilization device and the energy storage device have relatively high use reliability.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of batteries, and in particular to a battery cell, a battery device, an electric device, and an energy storage device. Background Art

[0002] With the popularization and promotion of the concept of green development, new energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the energy storage field, etc.

[0003] A battery usually includes a plurality of battery cells. A battery cell usually includes a housing, an electrode assembly, and electrode terminals electrically connecting the electrode assembly. The electrode terminals of multiple battery cells are usually connected to each other through a bus bar. During the use of the battery, there is an adverse situation where the electrode terminals are repeatedly subjected to external forces, resulting in stress fatigue or even fracture failure. Therefore, how to improve the strength of the electrode terminals is one of the problems to be solved. Summary of the Utility Model

[0004] To solve the above technical problems, the present application provides a battery cell, a battery device, an electric device, and an energy storage device that can improve the strength of the electrode terminals.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, including: a housing having an accommodation space, the housing including a first housing wall; an electrode assembly at least partially disposed in the accommodation space; a first electrode terminal assembly and a second electrode terminal assembly disposed on the first housing wall, and along a direction perpendicular to the thickness direction of the first housing wall, a part of the first electrode terminal assembly and a part of the second electrode terminal assembly overlap and abut against each other.

[0006] In the embodiments of the present application, since a part of the first electrode terminal assembly and a part of the second electrode terminal assembly abut against each other, the first electrode terminal assembly and the second electrode terminal assembly are centrally arranged, which can improve the strength of the electrode terminal assembly configuration area in the first housing wall and is beneficial to reducing the risk of deformation in this area. In addition, by centrally arranging the first electrode terminal assembly and the second electrode terminal assembly, it is beneficial to make full use of other spaces of the first housing wall, and is also beneficial to the centralized processing of the electrode terminals and their attached components during processing and maintenance. Since the first electrode terminal assembly and the second electrode terminal assembly are partially overlapped and abut against each other in the direction perpendicular to the thickness direction, the positions where the first electrode terminal assembly and the second electrode terminal assembly abut against each other can be mutually limited in the direction perpendicular to the thickness direction, reducing the external forces or torques perpendicular to the thickness direction borne by each electrode terminal assembly, improving the anti-torsion ability of the electrode terminal assembly, and thus helping to improve the strength and installation reliability of the electrode terminals.

[0007] In some embodiments, the first electrode terminal assembly includes a first electrode terminal, the second electrode terminal assembly includes a second electrode terminal, and the first electrode terminal and the second electrode terminal are arranged along a first direction; along a second direction, a part of the first electrode terminal assembly and a part of the second electrode terminal assembly overlap and abut against each other, wherein both the first direction and the second direction are perpendicular to the thickness direction of the first housing wall, and the first direction and the second direction are perpendicular to each other.

[0008] Since the first electrode terminal and the second electrode terminal are arranged along the first direction, and a part of the first electrode terminal assembly and a part of the second electrode terminal assembly overlap and abut against each other along the second direction, it is possible to limit the positions of the first electrode terminal assembly and the second electrode terminal assembly with a simple structure, and it is beneficial to compactly arrange the first electrode terminal assembly and the second electrode terminal assembly both in the first direction and in the second direction.

[0009] In some embodiments, at least one of the first electrode terminal assembly and the second electrode terminal assembly has a protruding portion, and along the second direction, the protruding portion of the first electrode terminal assembly abuts against the second electrode terminal assembly, and / or the protruding portion of the second electrode terminal assembly abuts against the first electrode terminal assembly.

[0010] Thus, the first electrode terminal assembly and / or the second electrode terminal assembly are limited in position relative to each other in the second direction by the protruding portion. When one of the electrode terminal assemblies is subjected to a torsional moment along the first housing wall, the moment acts not only on the electrode terminal assembly itself, but also on the other electrode terminal assembly through the protruding portion. In this way, the two electrode terminal assemblies can jointly resist the torsional moment, reducing the rotational moment borne by each electrode terminal assembly and improving the anti-torsion ability of the electrode terminal assembly, which helps to improve the strength and installation reliability of the electrode terminal.

[0011] In some embodiments, the first electrode terminal assembly includes a first electrode terminal and a first insulating member fixed to each other, the second electrode terminal assembly includes a second electrode terminal and a second insulating member fixed to each other, and at least one of the first insulating member and the second insulating member forms the protruding portion.

[0012] Since the first insulating member and / or the second insulating member form the protruding portion, and the protruding portion is located between the first electrode terminal and the second electrode terminal, it can not only limit the positions of the first electrode terminal and the second electrode terminal relative to each other through the protruding portion, improving the anti-torsion ability of the electrode terminal assembly; but also keep a relatively safe distance between the first electrode terminal and the second electrode terminal, which helps to reduce the probability of accidental conduction.

[0013] In some embodiments, one of the first electrode terminal assembly and the second electrode terminal assembly has the protruding portion, and the other has the recessed portion. Along the second direction, the protruding portion overlaps and abuts against the recessed portion.

[0014] Thus, the protruding portion and the recessed portion cooperate with each other for limiting, and the first electrode terminal assembly and the second electrode terminal assembly achieve mutual limiting perpendicular to the thickness direction through the protruding portion and the recessed portion, improving the anti-torsion ability of the electrode terminal assembly. Moreover, the cooperation between the protruding portion and the recessed portion is conducive to the compact configuration of the two electrode terminal assemblies.

[0015] In some embodiments, the protruding portion has a first mating surface, and the recessed portion has a second mating surface. Along the second direction, the projection of the first mating surface and the projection of the second mating surface at least partially overlap, and the overlapping portions of the projections of the first mating surface and the second mating surface abut against each other.

[0016] Since along the second direction, the projections of the first mating surface and the second mating surface at least partially overlap, and the overlapping portions of the projections of the first mating surface and the second mating surface abut against each other, the first mating surface and the second mating surface limit each other, and it is difficult for the mating surfaces to move in the state of abutting against each other. Moreover, stress concentration is not likely to occur on the mating surfaces.

[0017] In some embodiments, both the first mating surface and the second mating surface extend along the thickness direction, or both the first mating surface and the second mating surface extend obliquely with respect to the thickness direction.

[0018] Since both the first mating surface and the second mating surface extend along the thickness direction, the first mating surface and the second mating surface are attached to each other and limit the movement in the second direction. Since both the first mating surface and the second mating surface extend obliquely with respect to the thickness direction, the first mating surface and the second mating surface can not only limit each other in the second direction perpendicular to the thickness direction, but also support each other in the thickness direction, which helps to improve the anti-bending deformation ability of the electrode terminal assembly in multiple directions.

[0019] In some embodiments, the protruding portion further has a third mating surface, and the recessed portion further has a fourth mating surface. The third mating surface and the fourth mating surface abut against each other and are both parallel to the first housing wall. Along the thickness direction, the projection of the third mating surface and the projection of the fourth mating surface partially overlap, and the fourth mating surface is located between the third mating surface and the first housing wall.

[0020] Since both the third mating surface and the fourth mating surface are parallel to the first housing wall, and along the thickness direction, the projection of the third mating surface partially overlaps with the projection of the fourth mating surface, and the fourth mating surface is located between the third mating surface and the first housing wall. Therefore, through the support of the convex portion by the concave portion, one of the first electrode terminal assembly and the second electrode terminal assembly supports and fixes the other, which helps to improve the ability of the two electrode terminal assemblies to resist bending deformation in the thickness direction, and also helps to strengthen the ability of the area of the first housing wall where the first electrode terminal assembly and the second electrode terminal assembly are provided to resist bending deformation.

[0021] In some embodiments, the first electrode terminal assembly includes a first electrode terminal and a first insulating member fixed to each other, the second electrode terminal assembly includes a second electrode terminal and a second insulating member fixed to each other, at least one of the first electrode terminal and the first insulating member forms the convex portion, at least one of the second electrode terminal and the second insulating member forms the concave portion, and at least a part of the first insulating member and / or a part of the second insulating member is provided at a position where the convex portion and the concave portion are in contact with each other.

[0022] Thus, the convex portion extends into the concave portion and abuts against the concave portion. The first electrode terminal assembly and the second electrode terminal assembly cooperate through the convex portion and the concave portion to achieve mutual limiting of the two at least in the second direction, and improve the anti-torsion ability of the two. And by arranging the insulating member between the convex portion and the concave portion, the first electrode terminal and the second electrode terminal are kept insulated, which helps to reduce the occurrence probability of accidental conduction.

[0023] In some embodiments, the convex portion includes a first convex portion formed on the first electrode terminal and a second convex portion formed on the first insulating member; the concave portion is formed on at least one of the second insulating member and the second electrode terminal; along the second direction, both the first convex portion and the second convex portion overlap and abut against the concave portion, and a part of the first insulating member is provided between the first convex portion and the concave portion.

[0024] Since the convex portion includes the first convex portion and the second convex portion and both of them overlap and abut against the concave portion, the strength of the abutting position can be improved, and further the ability of the two electrode terminal assemblies as a whole to resist torsional moment can be improved. Moreover, since the first insulating member is always provided between the first convex portion and the concave portion, the insulation reliability between the first electrode terminal and the second electrode terminal can be improved.

[0025] In some embodiments, the protruding portion is formed on the first electrode terminal. The recessed portion includes a first recessed portion formed on the second electrode terminal and a second recessed portion formed on the second insulating member. Along the second direction, the protruding portion overlaps and abuts against both the first recessed portion and the second recessed portion, and a part of the second insulating member is interposed between the protruding portion and the first recessed portion.

[0026] Since the recessed portion includes the first recessed portion and the second recessed portion, and the protruding portion overlaps and abuts against both the first recessed portion and the second recessed portion, the strength of the abutting position can be improved, and thus the ability of the overall two-electrode terminal assembly to resist torsional torque can be improved. Moreover, since a part of the second insulating member is always interposed between the protruding portion and the first recessed portion, the insulation reliability between the first electrode terminal and the second electrode terminal can be improved.

[0027] In some embodiments, the recessed portion includes a first stepped portion and a second stepped portion. The second stepped portion is disposed on a side of the first stepped portion away from the first electrode terminal assembly. Along the thickness direction, a part of the first stepped portion is located between the protruding portion and the first housing wall, and at least a part of the protruding portion is received in a stepped space formed by the first stepped portion. The first insulating member further includes a covering portion, and the covering portion is connected to the second protruding portion and at least a part of the covering portion is received in a stepped space formed by the second stepped portion.

[0028] Thus, through the cooperation between the protruding portion and the first stepped portion, the bending deformation (especially the complete deformation in a direction away from the first housing wall) of the second electrode terminal assembly can be restricted. Further, at least a part of the protruding portion is received in the first stepped portion to reduce the space occupied by the protruding portion and improve the space utilization rate. By providing the covering portion, the creepage distance on the surfaces of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, by receiving the covering portion in the second stepped portion, the covering portion does not occupy extra space, thereby improving the space utilization rate.

[0029] In some embodiments, the recessed portion includes a first stepped portion and a second stepped portion. The second stepped portion is disposed on a side of the first stepped portion away from the first electrode terminal assembly. Along the thickness direction, a part of the first stepped portion is located between the protruding portion and the first housing wall, and at least a part of the protruding portion is received in a stepped space formed by the first stepped portion. The second insulating member further includes a covering portion, and the covering portion is connected to the second recessed portion and at least a part of the covering portion is received in a stepped space formed by the second stepped portion.

[0030] Thus, the bending deformation of the second electrode terminal assembly (especially the complete deformation in the direction away from the first housing wall) can be limited by the cooperation between the protrusion and the first step portion, and the protrusion is further at least partially accommodated in the first step portion, so as to reduce the space occupied by the protrusion and improve the space utilization. By providing the covering portion, the creepage distance on the surface of the first electrode terminal and the second electrode terminal can be increased, and the insulation reliability can be improved. Moreover, by accommodating the covering portion in the second step portion, the covering portion does not occupy additional space, thereby improving the space utilization.

[0031] In some embodiments, along the thickness direction, the overlapping portion of the protruding portion and the recessed portion is an overlapping area, and the length of the overlapping area along the first direction is L11, and L11 is in the range of 0.5 mm to 6 mm.

[0032] Therefore, by setting the length of the overlapping area along the first direction to be smaller, the matching strength between the protruding portion and the recessed portion can be improved, and it is beneficial to improve the space utilization.

[0033] In some embodiments, the electrode assembly includes a first electrode piece and a second electrode piece with opposite polarities, the first electrode terminal is electrically connected to the first electrode piece, and the second electrode terminal is electrically connected to the second electrode piece.

[0034] Thus, electrode terminals with opposite polarities can be arranged on the first shell wall of the battery cell, which is beneficial to reducing the space occupied by the busbar and the like, and is also beneficial to arranging other structural parts such as heat exchangers on other shell walls of the battery cell, which is beneficial to improving the volume utilization of the battery.

[0035] In some embodiments, the first insulating member is partially disposed between the first electrode terminal and the first shell wall, and the second insulating member is partially disposed between the second electrode terminal and the first shell wall.

[0036] Thus, both the first electrode terminal and the second electrode terminal can be insulated from the first case wall.

[0037] In some embodiments, a first recess and a second recess are formed in the first shell wall, the first recess and the second recess are located on a side of the first shell wall away from the accommodating space along the thickness direction, at least a portion of the first insulating member is located in the first recess, and at least a portion of the second insulating member is located in the second recess.

[0038] This helps to improve the installation strength of the insulating member relative to the first shell wall, reduce the possibility of displacement of the insulating member along the surface of the first shell wall, and facilitate the positioning of the insulating member and the first shell wall during assembly.

[0039] In some embodiments, the recessed depth of the first recess along the thickness direction is H1, and the wall thickness of the portion of the first housing wall around the first recess along the thickness direction is H. H1 ranges from 30% to 70% of H.

[0040] Thereby, the first recess accommodates part of the insulating member, which can not only reduce the space occupied by the electrode terminal assembly, but also reduce the influence of forming the recess on the strength of the first housing wall.

[0041] In some embodiments, the first electrode terminal includes a first main body portion and a first extension portion connected to each other, and the second electrode terminal includes a second main body portion and a second extension portion connected to each other. Along the first direction, at least part of the first extension portion and at least part of the second extension portion are located between the first main body portion and the second main body portion, and the first extension portion and the second extension portion are arranged at intervals with partial overlap along the second direction.

[0042] Thereby, the electrode terminal can be designed to have a main body portion and an extension portion. While enabling the electrode terminal to be stably connected to the first housing wall, it is also beneficial to increase the heat dissipation area of the electrode terminal, and beneficial to increase the connection area and connection reliability between the electrode terminal and the bus bar. In addition, since along the first direction, the first extension portion and the second extension portion are located between the first main body portion and the second main body portion, the bending strength of the region where the electrode terminal is provided in the first housing wall can be enhanced through the cooperation of the two terminal plates.

[0043] In some embodiments, the first electrode terminal assembly further includes a first terminal plate connected to the first electrode terminal. At least part of the first terminal plate is disposed on the side of the first housing wall facing the accommodation space. The second electrode terminal assembly further includes a second terminal plate connected to the second electrode terminal. At least part of the second terminal plate is disposed on the side of the first housing wall facing the accommodation space. The first main body portion and the first terminal plate are directly connected through a first connecting column; the second main body portion and the second terminal plate are directly connected through a second connecting column.

[0044] Since the electrode terminal and the terminal plate can be connected together through the connecting column, they can function as an electrode terminal assembly as a whole to draw current from the electrode assembly. Moreover, the connecting column is disposed on the main body portion, so that the electrode terminal can be reliably fixed to the first housing wall at the main body portion.

[0045] In some embodiments, the protrusion is disposed on a side of the first main body portion close to the second extension portion, the recess is disposed on a side of the second extension portion close to the first main body portion, and / or the protrusion is disposed on a side of the first extension portion close to the second main body portion, the recess is disposed on a side of the second main body portion close to the first extension portion, and / or the protrusion is disposed on a side of the first extension portion close to the second extension portion, the recess is disposed on a side of the second extension portion close to the first extension portion.

[0046] Since the recess disposed on the second extension portion can be abutted by the protrusion disposed on the first main body portion and / or the first extension portion, and the protrusion disposed on the first extension portion can be abutted by the recess disposed on the second main body portion, the torsional moment can be effectively resisted, and the risk of breakage of the extension portion due to its relatively long formation can be reduced.

[0047] In some embodiments, the length of the protrusion in the second direction is W11, the length of the first housing wall in the second direction is W, and W11 is in the range of 10% to 90% of W.

[0048] Thereby, the first housing wall can be fully utilized in the second direction, the supporting force between the first electrode terminal assembly and the second electrode terminal assembly can be surely improved, the bending strength of the electrode terminal can be increased, and the strength of the first housing wall around the electrode terminal can also be enhanced.

[0049] In some embodiments, W11 is in the range of 5 mm to 50 mm.

[0050] Thereby, the size of the overlapping region in the second direction can be determined according to the size of the first housing wall in the second direction, and by setting the size of the overlapping region in the second direction to be relatively large, the supporting force between the first electrode terminal assembly and the second electrode terminal can be improved, the bending strength of the electrode terminal can be increased, and the strength of the first housing wall around the electrode terminal can also be enhanced.

[0051] In a second aspect, an embodiment of the present application further provides a battery device, including a box body and at least two battery cells as described in the first aspect above.

[0052] Thereby, a battery with enhanced strength of the electrode terminal assembly in the battery cell can be provided, which helps to improve the use reliability of the battery.

[0053] In some embodiments, the first electrode terminal assembly includes a first electrode terminal, which includes a first main body portion and a first extension portion connected to each other. The second electrode terminal assembly includes a second electrode terminal, which includes a second main body portion and a second extension portion connected to each other. Along a first direction, at least a part of the first extension portion and at least a part of the second extension portion are located between the first main body portion and the second main body portion, and the first extension portion and the second extension portion are arranged at intervals with partial overlap along a second direction. Wherein, both the first direction and the second direction are perpendicular to the thickness direction of the first housing wall, and the first direction and the second direction are perpendicular to each other. Each battery cell is arranged along the second direction, and in adjacent battery cells, the first extension portion of one battery cell and the second extension portion of another battery cell are arranged along the second direction and are electrically connected through a bus bar.

[0054] Since the bus bar is connected to the first extension portion and the second extension portion, and the first extension portion and the second extension portion are located between the first main body portion and the second main body portion, the bending resistance of this connection part is relatively strong. Therefore, the first electrode terminal, the second electrode terminal, and the first housing wall are not easily bent, deformed, or broken, thereby improving the use reliability of the battery.

[0055] In some embodiments, at least one box wall of the box body has a boss, which is formed by the box wall bulging towards the direction away from the battery cell. The boss forms a receiving portion on the side facing the battery cell. Along the direction perpendicular to the box wall where the boss is formed, in the same projection plane, the projections of the first electrode terminal assembly and the second electrode terminal assembly do not exceed the projection of the boss, and at least a part of the first electrode terminal assembly and / or the second electrode terminal assembly is received in the receiving portion.

[0056] Thus, it is possible to only increase the height of the box body at the position where the first electrode terminal assembly, the second electrode terminal, and the bus bar are located, thereby reducing the size of the battery and also being beneficial to improving the volume utilization rate of the battery.

[0057] In a third aspect, an embodiment of the present application further provides an electrical device, including the battery cell as described in the first aspect above, or the battery device as described in the second aspect above. The battery cell or the battery device is used to store or provide electrical energy.

[0058] Thus, it is possible to provide an electrical device with a battery in which the electrode terminals of the battery cell are not easily twisted or have a small degree of twisting, improving the use reliability of the electrical device and also being beneficial to reducing the maintenance time of the electrical device.

[0059] Fourthly, an embodiment of the present application further provides an energy storage device, including the battery cell described in the first aspect above, or the battery device described in the second aspect above, where the battery cell or the battery device is used to store or provide electrical energy.

[0060] Therefore, it is possible to provide an energy storage device of a battery in which the electrode terminals carrying the battery cells are not easily twisted or have a small degree of twisting, improving the reliability of use of the energy storage device and also facilitating the reduction of the maintenance time of the energy storage device.

[0061] 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 objects, features, and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. Description of the Drawings

[0062] Figure 1 Schematic diagram of an electrical device provided by an embodiment of the present application being a vehicle;

[0063] Figure 2 Schematic diagram of a battery provided by an embodiment of the present application;

[0064] Figure 3 Explosion schematic diagram of a battery cell provided by an embodiment of the present application;

[0065] Figure 4 For Figure 3 Top view schematic diagram of the battery cell provided by the embodiment of;

[0066] Figure 5 Top view schematic diagram of a battery cell provided by an embodiment of the present application;

[0067] Figure 6 Top view schematic diagram of a battery cell provided by another embodiment of the present application;

[0068] Figure 7 Top view schematic diagram of a battery cell provided by yet another embodiment of the present application;

[0069] Figure 8 Top view schematic diagram of a battery cell provided by still another embodiment of the present application;

[0070] Figure 9 Top view schematic diagram of the first housing wall provided by an embodiment of the present application;

[0071] Figure 10 Top view schematic diagram of the first housing wall provided by another embodiment of the present application;

[0072] Figure 11 For Figure 10 Cross-sectional view taken along line A-A in;

[0073] Figure 12 is Figure 11 A partial enlarged schematic view of part C in

[0074] Figure 13 is Figure 10 A sectional schematic view taken along B - B in

[0075] Figure 14 is Figure 10 An exploded schematic view of the first housing wall provided by an embodiment of

[0076] Figure 15 is Figure 14 A partial enlarged schematic view of part D in

[0077] Figure 16 A top view schematic of the first housing wall provided by another embodiment of the present application

[0078] Figure 17 A schematic view of battery cells connected by a bus bar provided by an embodiment of the present application

[0079] Figure 18 A schematic view of a battery with a boss provided by an embodiment of the present application

[0080] Explanation of reference numerals

[0081] 1000, vehicle; 100, battery device; 10, battery cell; 20, box body; 20A, upper box body; 20B, lower box body; 201, boss; 200, controller; 300, motor; 11, outer shell; 11a, accommodation space; 111, first housing wall; 1111, first recess; 1112, second recess; 12, electrode assembly; 121, positive electrode tab; 122, negative electrode tab; 13, first electrode terminal assembly; 131, first electrode terminal; 1311, first main body part; 1312, first extension part; 1313, first terminal plate; 1314, first connection column; 132, first insulating part; 14, second electrode terminal assembly; 141, second electrode terminal; 1411, second main body part; 1412, second extension part; 1413, second terminal plate; 1414, second connection column; 142, second insulating part; 15, protruding part; 151, first protruding part; 152, covering part; 153, second protruding part; 16, recessed part; 161, first step part; 162, second step part; 163, first recess; 164, second recess; 17, bus bar; X, first direction; Z, thickness direction; Y, second direction. Detailed implementation manners

[0082] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0083] 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 this application are intended to cover non-exclusive inclusion.

[0084] In the description of the embodiments of the present application, the technical terms "first", "second", "third", "fourth", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0085] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0086] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0087] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "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, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed, operated or used in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application.

[0088] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of 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 the specific circumstances.

[0089] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0090] Below, this application is described in detail.

[0091] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in the field of energy storage.

[0092] A battery usually includes multiple battery cells, each of which includes a housing, an electrode assembly, and an electrode terminal electrically connected to the electrode assembly. The electrode terminals of multiple battery cells are usually connected to each other through a busbar. During the use of the battery, the electrode terminals may be repeatedly subjected to external forces, resulting in stress fatigue or even fracture failure. Therefore, how to improve the strength of the electrode terminals is one of the issues to be solved.

[0093] After research, it was found that if the two electrode terminals are arranged compactly and parts of the two electrode terminals are made to abut against each other, so that the two electrode terminals are limited to each other by the abutting position, it can prevent the electrode terminals from twisting after being subjected to external force to a certain extent, improve the anti-twisting ability of the electrode terminals, and further improve the strength of the electrode terminals.

[0094] Based on such technical concept, the present application provides a battery cell, which includes: a shell having a accommodating space, the shell including a first shell wall; an electrode assembly, at least partially disposed in the accommodating space; a first electrode terminal assembly and a second electrode terminal assembly, disposed in the first shell wall, along a direction perpendicular to the thickness direction of the first shell wall, a portion of the first electrode terminal assembly and a portion of the second electrode terminal assembly overlap and abut against each other.

[0095] Since a part of the first electrode terminal assembly and a part of the second electrode terminal assembly are in contact with each other, the first electrode terminal assembly and the second electrode terminal assembly are centrally arranged, which can improve the strength of the electrode terminal assembly configuration area in the first housing wall and is conducive to reducing the risk of deformation in this area. In addition, by centrally arranging the first electrode terminal assembly and the second electrode terminal assembly, it is conducive to making full use of other spaces of the first housing wall, and is also conducive to the centralized processing of the electrode terminals and their attached components during processing and maintenance. Since the first electrode terminal assembly and the second electrode terminal assembly are partially overlapped and in contact with each other in a direction perpendicular to the thickness direction, the positions where the first electrode terminal assembly and the second electrode terminal assembly are in contact with each other can be limited in the direction perpendicular to the thickness direction, reducing the external force or torque in the direction perpendicular to the thickness direction borne by each electrode terminal assembly and improving the anti-torsion ability of the electrode terminal assembly, thereby helping to improve the strength and installation reliability of the electrode terminals.

[0096] The battery cell involved in the embodiments of the present application may be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0097] The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application do not limit this.

[0098] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode plate, a negative electrode plate and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode plate and the negative electrode plate. The separator is arranged between the positive electrode plate and the negative electrode plate, which can play a role in preventing short circuit between the positive and negative electrodes and at the same time allow active ions to pass through. The positive electrode plate generally includes a positive electrode current collector and a positive electrode active material attached to the positive electrode current collector. Exemplarily, the positive electrode current collector may be aluminum foil. The negative electrode plate generally includes a negative electrode current collector and a negative electrode active material attached to the negative electrode current collector. Exemplarily, the negative electrode current collector may be copper foil.

[0099] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab. The positive tab can be connected to the positive electrode current collector, and the negative tab can be connected to the negative electrode current collector.

[0100] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum plastic film, etc.

[0101] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0102] In some embodiments, two electrode terminals are provided on the housing, and the electrode terminals are electrically connected to the tabs. The electrode terminals and the tabs may be connected directly or through an adapter or the like.

[0103] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0104] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0105] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0106] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0107] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0108] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0109] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0110] As an example, the box body can be part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beams and longitudinal beams of the vehicle.

[0111] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body, and at least one side of the box body is provided with a door. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0112] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0113] Next, with reference to the drawings, taking the electrical device in the embodiment of the present application as the vehicle 1000 as an example for illustration.

[0114] Figure 1 It is a schematic structural diagram of the vehicle 1000 provided in an embodiment of the present application. The 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. As Figure 1 shown, a battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can further 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 the vehicle 1000.

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

[0116] Figure 2 It is a schematic exploded view of the structure of the battery provided in some embodiments of the present application. As Figure 2 shown, the battery device 100 includes a box body 20. The box body 20 can be divided into an upper box body 20A and a lower box body 20B. The upper box body 20A and the lower box body 20B are mutually opposed to form an arrangement space for the battery cells 10 therebetween.

[0117] In the battery device 100, there may be multiple battery cells 10. The multiple battery cells 10 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 10. The multiple battery cells 10 can be directly connected in series, parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells 10 is placed in the arrangement space defined by the upper box body 20A and the lower box body 20B. Of course, the battery device 100 can also be such that multiple battery cells 10 are first connected in series, parallel, or in a combined series-parallel connection to form a battery module form, 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 arrangement space defined by the upper box body 20A and the lower box body 20B. The battery device 100 may further include other structures. For example, the battery device 100 may further include a bus bar ( Figure 2 not shown in the figure) for realizing the electrical connection between the multiple battery cells 10.

[0118] Next, a detailed description will be given with reference to the accompanying drawings.

[0119] Figure 3 An exploded schematic view of a battery cell provided in an embodiment of the present application; Figure 4 For Figure 3 the top view schematic diagram of the battery cell provided in the embodiment of Figure 5 A top view schematic diagram of a battery cell provided in an embodiment of the present application; Figure 6 A top view schematic diagram of a battery cell provided in another embodiment of the present application; Figure 7 A top view schematic diagram of a battery cell provided in yet another embodiment of the present application; Figure 8 A top view schematic diagram of a battery cell provided in still another embodiment of the present application; Figure 9 A top view schematic diagram of the first housing wall provided in an embodiment of the present application; Figure 10 A top view schematic diagram of the first housing wall provided in another embodiment of the present application; Figure 11 For Figure 10 the cross-sectional view taken along A-A in Figure 12 For Figure 11 the partial enlarged schematic diagram of part C in Figure 13 For Figure 10 the cross-sectional view taken along B-B in Figure 14 For Figure 10 the exploded schematic diagram of the first housing wall provided in the embodiment of Figure 15 For Figure 14 the partial enlarged schematic diagram of part D in Figure 16 A top view schematic diagram of the first housing wall provided in yet another embodiment of the present application; Figure 17 A schematic diagram of battery cells connected through a bus bar provided in an embodiment of the present application; Figure 18 A schematic diagram of a battery provided with a boss provided in an embodiment of the present application.

[0120] In the description of the embodiments of the present application, for the convenience of description, the direction of arrow X is used to represent the "first direction", the direction of arrow Y is used to represent the "second direction", and the direction of arrow Z is used to represent the "thickness direction of the first housing wall" and the "thickness direction".

[0121] A first aspect of the present application provides a battery cell 10, as Figure 3 and Figure 4 shown, including: a housing 11 having an accommodation space 11a, the housing 11 including a first housing wall 111; an electrode assembly 12 at least partially disposed in the accommodation space 11a; a first electrode terminal assembly 13 and a second electrode terminal assembly 14 disposed on the first housing wall 111, and along a direction perpendicular to the thickness direction Z of the first housing wall 111, a part of the first electrode terminal assembly 13 and a part of the second electrode terminal assembly 14 overlap and abut against each other.

[0122] In some embodiments, the battery cell 10 includes a housing 11. The housing 11 is used to encapsulate components such as the electrode assembly 12 and the electrolyte. The housing 11 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum plastic film, etc.

[0123] In some embodiments, the housing 11 can be a sealed structure or a non-sealed structure. As an example, when the housing 11 is a non-sealed structure, the housing 11 plays a role in protecting the electrode assembly 12, and a sealing bag is further included between the housing 11 and the electrode assembly 12, and the sealing bag is used to encapsulate the electrode assembly 12 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum plastic film. As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. In Figures 3 to 16 the shown embodiment, for the convenience of description, a square shell battery cell is taken as an example for description.

[0124] In some embodiments, as Figure 3 shown, the housing 11 includes a plurality of housing walls, and a part of the housing walls enclose a space with an opening, and the electrode assembly 12 can enter the housing from the opening, and the opening can be closed by another housing wall (such as the first housing wall 111) to form an accommodation space 11a for accommodating substances such as the electrode assembly 12 and the electrolyte. The housing 11 can be provided with one or more openings. The housing wall (such as the first housing wall 111) closing the opening can also be configured as a top cover.

[0125] The thickness direction Z of the first housing wall 111 refers to the direction in which the first housing wall 111 faces the accommodation space 11a.

[0126] In some embodiments, asFigure 3 As shown, the battery cell 10 includes an electrode assembly 12. The electrode assembly 12 includes a positive electrode sheet, a negative electrode sheet, and a separator. During the charge and discharge process of the battery cell 10, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode sheet and the negative electrode sheet, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through. Figure 3 In the embodiment shown, as the electrode assembly 12, two stacked winding bodies formed by stacking and winding the positive electrode sheet, the negative electrode sheet and the separator are shown, but the electrode assembly 12 is not limited to Figure 3 The winding type shown may also be a laminated type or other structural forms, for example.

[0127] The electrode assembly 12 is provided with a tab, which can conduct current from the electrode assembly 12. Figure 3 In the specific embodiment shown, the electrode assembly 12 has a positive electrode ear 121 and a negative electrode ear 122, which are arranged on the same side of the electrode assembly 12 along the thickness direction Z of the first housing wall 111 and are both arranged near one end of the electrode assembly 12 along the first direction X. Of course, the positive electrode ear 121 and the negative electrode ear 122 can also be arranged on opposite sides of the electrode assembly 12; the positive electrode ear 121 and the negative electrode ear 122 can also be arranged near the two ends of the electrode assembly 12 along the first direction X.

[0128] The first direction X refers to the extending direction of the longest side of the first shell wall 111 , and the first direction X is perpendicular to the thickness direction Z of the first shell wall 111 .

[0129] In some embodiments, Figure 3 As shown, the housing 11 is provided with a first electrode terminal assembly 13 and a second electrode terminal assembly 14, and the first electrode terminal 131 in the first electrode terminal assembly 13 and the second electrode terminal 141 in the second electrode terminal assembly 14 are both electrically connected to the tabs, and can be directly connected to the tabs or indirectly connected to the tabs through a transition component. For ease of description, in the embodiment of the present application, the housing wall where the first electrode terminal assembly 13 and the second electrode terminal assembly 14 are located is referred to as the first housing wall 111.

[0130] Optionally, the first electrode terminal assembly 13 and the second electrode terminal assembly 14 may have the same polarity or opposite polarity.

[0131] In some embodiments, the first electrode terminal assembly 13 and the second electrode terminal assembly 14 are arranged close to each other, and a part of the first electrode terminal assembly 13 abuts against a part of the second electrode terminal assembly 14. The first electrode terminal assembly 13 and the second electrode terminal assembly 14 may be arranged near one end of the first housing wall 111, or may be arranged at a substantially central position of the first housing wall 111.

[0132] Specifically, in the direction perpendicular to the thickness direction Z of the first housing wall 111, a part of the first electrode terminal assembly 13 and a part of the second electrode terminal assembly 14 overlap, and the surfaces of the overlapping parts close to each other abut. The surfaces of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 that abut against each other can be configured into shapes that fit each other, such as flat surfaces, inclined surfaces, concave-convex surfaces, and arc surfaces that fit and abut against each other.

[0133] In the embodiments of the present application, since a part of the first electrode terminal assembly 13 and a part of the second electrode terminal assembly 14 abut against each other, the first electrode terminal assembly 13 and the second electrode terminal assembly 14 are centrally arranged, which can improve the strength of the electrode terminal assembly configuration area in the first housing wall 111, and is beneficial to reducing the risk of deformation in this area. In addition, by centrally arranging the first electrode terminal assembly 13 and the second electrode terminal assembly 14, it is beneficial to make full use of other spaces of the first housing wall 111, and is also beneficial to the centralized processing of the electrode terminals and their attached components during processing and maintenance. Since the first electrode terminal assembly 13 and the second electrode terminal assembly 14 partially overlap and abut against each other in the direction perpendicular to the thickness direction Z, the positions where the first electrode terminal assembly 13 and the second electrode terminal assembly 14 abut against each other can be limited in the direction perpendicular to the thickness direction Z, reducing the external force or torque in the direction perpendicular to the thickness direction Z borne by each electrode terminal assembly, and improving the anti-torsion ability of the electrode terminal assembly, thereby helping to improve the strength and installation reliability of the electrode terminals.

[0134] In some embodiments, as Figures 5 to 17 shown, the first electrode terminal assembly 13 includes a first electrode terminal 131, the second electrode terminal assembly 14 includes a second electrode terminal 141, and the first electrode terminal 131 and the second electrode terminal 141 are arranged along the first direction X; along the second direction Y, a part of the first electrode terminal assembly 13 and a part of the second electrode terminal assembly 14 overlap and abut against each other, wherein the first direction X and the second direction Y are both perpendicular to the thickness direction Z of the first housing wall 111, and the first direction X and the second direction Y are perpendicular to each other.

[0135] The second direction Y refers to the extending direction of the shortest side of the first housing wall 111, and the second direction Y is perpendicular to the thickness direction Z of the first housing wall 111 and the first direction X respectively.

[0136] Since the first electrode terminal 131 and the second electrode terminal 141 are arranged along the first direction X, and a part of the first electrode terminal assembly 13 and a part of the second electrode terminal assembly 14 overlap and abut against each other along the second direction Y, the mutual limitation of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 can be realized with a simple structure, and it is beneficial to compactly arrange the first electrode terminal assembly 13 and the second electrode terminal assembly 14 both in the first direction X and in the second direction Y.

[0137] In some embodiments, as Figures 5 to 17 shown, at least one of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 has a protruding portion 15. Along the second direction Y, the protruding portion 15 of the first electrode terminal assembly 13 abuts against the second electrode terminal assembly 14, and / or the protruding portion 15 of the second electrode terminal assembly 14 abuts against the first electrode terminal assembly 13.

[0138] Along the first direction X, the first electrode terminal assembly 13 and the second electrode terminal assembly 14 have an overlap.

[0139] In some embodiments, the overlapping portion of the first electrode terminal assembly 13 relative to the second electrode terminal assembly 14 has a protruding portion 15, and the second electrode terminal assembly 14 is configured with a recessed portion 16 corresponding to the protruding portion 15. The protruding portion 15 protrudes from the first electrode terminal assembly 13 in a direction close to the second electrode terminal assembly 14 and abuts against the recessed portion 16 of the second electrode terminal assembly 14. The protruding portion 15 has a surface facing the second direction Y and conforming to the recessed portion 16, and abuts against the second electrode terminal assembly 14 through this surface.

[0140] In some embodiments, the overlapping portion of the second electrode terminal assembly 14 relative to the first electrode terminal assembly 13 has a protruding portion 15, and the first electrode terminal assembly 13 is configured with a recessed portion 16 corresponding to the protruding portion 15. The protruding portion 15 protrudes from the second electrode terminal assembly 14 in a direction close to the first electrode terminal assembly 13 and abuts against the recessed portion 16 of the first electrode terminal assembly 13. The protruding portion 15 has a surface facing the second direction Y and conforming to the recessed portion 16, and abuts against the first electrode terminal assembly 13 through this surface.

[0141] In some embodiments, the overlapping portion of the first electrode terminal assembly 13 relative to the second electrode terminal assembly 14 has a protruding portion 15, and the overlapping portion of the second electrode terminal assembly 14 relative to the first electrode terminal assembly 13 also has a protruding portion 15. One side of the protruding portion 15 of the first electrode terminal assembly 13 in the second direction Y abuts against one side of the protruding portion 15 of the second electrode terminal assembly 14 in the second direction Y.

[0142] A plurality of protrusions 15 may be provided, or only one protrusion 15 may be provided. The present application does not impose any special limitation on the number of protrusions 15. Optionally, a plurality of protrusions 15 are arranged at intervals from each other in the second direction Y on one of the first electrode terminal assembly 13 and the second electrode terminal assembly 14. At least one protrusion 15 is arranged on the other of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 and inserted into the gap separated by the plurality of protrusions 15, and abuts against one side of the adjacent protrusion 15 in the second direction.

[0143] Thus, the first electrode terminal assembly 13 and / or the second electrode terminal assembly 14 are limited relative to each other in the second direction Y by the protrusions 15. When a torsional moment is applied to one of the electrode terminal assemblies along the first housing wall 111, this moment acts not only on the electrode terminal assembly itself, but also on the other electrode terminal assembly through the protrusions 15. In this way, the two electrode terminal assemblies can jointly resist the torsional moment, reducing the rotational moment borne by each electrode terminal assembly and improving the anti-torsion ability of the electrode terminal assembly, which helps to improve the strength and installation reliability of the electrode terminals.

[0144] In an alternative embodiment, the first electrode terminal assembly 13 includes a first electrode terminal 131 and a first insulating member 132 that are fixedly connected to each other, and the second electrode terminal assembly 14 includes a second electrode terminal 141 and a second insulating member 142 that are fixedly connected to each other. Moreover, the first electrode terminal 131 and the second electrode terminal 141 are connected to the same one of the positive electrode tab 121 and the negative electrode tab 122 and have the same polarity, and at least one of the first electrode terminal 131 and the second electrode terminal 141 forms a protrusion 15. The first insulating member 132 is at least located between the first electrode terminal 131 and the first housing wall 111, and the second insulating member 142 is at least located between the second electrode terminal 141 and the second housing wall.

[0145] In some embodiments, as Figures 5 to 9 shown, the first electrode terminal assembly 13 includes a first electrode terminal 131 and a first insulating member 132 that are fixedly connected to each other, and the second electrode terminal assembly 14 includes a second electrode terminal 141 and a second insulating member 142 that are fixedly connected to each other. At least one of the first insulating member 132 and the second insulating member 142 forms a protrusion 15.

[0146] The first electrode terminal assembly 13 includes a first electrode terminal 131 and a first insulating member 132. The first electrode terminal 131 partially penetrates the first housing wall 111 and is electrically connected to the electrode assembly 12, and the first insulating member 132 is located between the first electrode terminal 131 and the first housing wall 111, and / or between the first electrode terminal 131 and the second electrode terminal 141.

[0147] Specifically, the first insulating member 132 can be disposed around the circumferential side surface of the first electrode terminal 131 perpendicular to the thickness direction Z, or the first insulating member 132 can be disposed in contact with the surface of the first electrode terminal 131 close to the first housing wall 111. Alternatively, the first insulating member 132 can be configured as a box type with an opening on one side, and the first insulating member 132 is placed in the box-type first insulating member 132.

[0148] The second electrode terminal assembly 14 includes a second electrode terminal 141 and a second insulating member 142. The second electrode terminal 141 partially penetrates the first housing wall 111 and is electrically connected to the electrode assembly 12. The second insulating member 142 is located between the second electrode terminal 141 and the first housing wall 111, and / or between the second electrode terminal 141 and the first electrode terminal 131.

[0149] Specifically, the second insulating member 142 can be disposed around the circumferential side surface of the second electrode terminal 141 perpendicular to the thickness direction Z, or the second insulating member 142 can be disposed in contact with the surface of the second electrode terminal 141 close to the first housing wall 111. Alternatively, the second insulating member 142 can be configured as a box type with an opening on one side, and the second insulating member 142 is placed in the box-type second insulating member 142.

[0150] In some embodiments, the first insulating member 132 is disposed between the first electrode terminal 131 and the second electrode terminal 141, and at least a part of the first insulating member 132 protrudes towards the direction close to the second electrode terminal assembly 14 to form a protruding portion 15. One side of the protruding portion 15 in the second direction Y abuts against the first electrode terminal 131. Optionally, a plurality of protruding portions 15 are spaced apart from each other in the second direction Y, and a part of the first electrode terminal 131 is located between two adjacent protruding portions 15 and abuts against one side of the protruding portion 15 in the second direction Y respectively.

[0151] In some embodiments, as Figures 5 to 9 shown, the second insulating member 142 is disposed between the first electrode terminal 131 and the second electrode terminal 141, and at least a part of the second insulating member 142 protrudes towards the direction close to the first electrode terminal assembly 13 to form a protruding portion 15. One side of the protruding portion 15 in the second direction Y abuts against the second electrode terminal 141. Optionally, a plurality of protruding portions 15 are spaced apart from each other in the second direction Y, and a part of the second electrode terminal 141 is located between two adjacent protruding portions 15 and abuts against one side of the protruding portion 15 in the second direction Y respectively.

[0152] Further, as Figure 8 and Figure 9As shown, a first insulating member 132 and a second insulating member 142 are provided between the first electrode terminal 131 and the second electrode terminal 141. A part of the first insulating member 132 protrudes toward the second electrode terminal assembly 14 to form a protruding portion 15, and a part of the second insulating member 142 protrudes toward the first electrode terminal assembly 13 to form a protruding portion 15. At least one side of the protruding portion 15 of the first insulating member 132 in the second direction Y abuts against one side of the protruding portion 15 of the second insulating member 142 in the second direction Y.

[0153] In an alternative embodiment, a part of the first electrode terminal 131 can be constructed to protrude toward the second electrode terminal assembly 14 to form a part of the protruding portion 15, and the first insulating member 132 is disposed around the protrusion to form another part of the protruding portion 15, and the protruding portion 15 abuts against the second electrode terminal 141 or the second insulating member 142. Alternatively, a part of the first electrode terminal 131 can be constructed to protrude toward the second electrode terminal assembly 14 to form the protruding portion 15, and the protruding portion 15 abuts against the second insulating member 142.

[0154] In another alternative embodiment, as Figure 7 shown, a part of the second electrode terminal 141 can be constructed to protrude toward the first electrode terminal assembly 13 to form a part of the protruding portion 15, and the second insulating member 142 is disposed around the protrusion to form another part of the protruding portion 15, and the protruding portion 15 abuts against the first electrode terminal 131 or the first insulating member 132. Alternatively, a part of the second electrode terminal 141 can be constructed to protrude toward the first electrode terminal assembly 13 to form the protruding portion 15, and the protruding portion 15 abuts against the first insulating member 132.

[0155] The protruding portion 15 can be formed in the entire thickness direction of the electrode terminal, or can be formed within a partial range in the thickness direction of the electrode terminal.

[0156] Furthermore, protruding portions 15 are respectively constructed on the first electrode terminal 131 and the second electrode terminal 141 to be close to each other. The first insulating member 132 and / or the second insulating member 142 are disposed between the protruding portion of the first electrode terminal 131 and the second electrode terminal 141, and the first insulating member 132 and / or the second insulating member 142 are disposed between the protruding portion of the second electrode terminal 141 and the first electrode terminal 131. It can be that one of the first insulating member 132 and the second insulating member 142 protrudes together with the protruding portion of the electrode terminal on the same side and is separated between the two electrode terminals; or, it can be that both the first insulating member 132 and the second insulating member 142 protrude together with the protruding portions of the respective electrode terminals on the same side and are separated between the two electrode terminals.

[0157] Since the first insulating member 132 and / or the second insulating member 142 form a protrusion 15 which is located between the first electrode terminal 131 and the second electrode terminal 141, the first electrode terminal 131 and the second electrode terminal 141 can be mutually limited by the protrusion 15, improving the anti-torsion ability of the electrode terminal assembly; and the first electrode terminal 131 and the second electrode terminal 141 can maintain a relatively safe distance, which helps to reduce the occurrence probability of accidental conduction.

[0158] In some embodiments, as Figures 5 to 7 、 Figures 10 to 15 shown, one of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 has a protrusion 15, and the other has a recess 16. Along the second direction Y, the protrusion 15 and the recess 16 overlap and abut.

[0159] As Figure 12 and Figure 14 shown, the protrusion 15 can be formed on the first electrode terminal assembly 13, and the recess 16 corresponding to the protrusion 15 can be formed on the second electrode terminal assembly 14. Alternatively, the protrusion 15 can be formed on the second electrode terminal assembly 14, and the recess 16 corresponding to the protrusion 15 can be formed on the first electrode terminal assembly 13. Additionally, the protrusion 15 and the recess 16 can be respectively formed on the first electrode terminal assembly 13, and the recess 16 and the protrusion 15 can be respectively formed on the second electrode terminal assembly 14 corresponding to the positions of the protrusion 15 and the recess 16.

[0160] The protrusion 15 is inserted into the recess 16, and along the thickness direction Z of the first housing wall 111, the protrusion 15 and the recess 16 overlap and abut.

[0161] Thus, the protrusion 15 and the recess 16 cooperate with each other for limiting, and the first electrode terminal assembly 13 and the second electrode terminal assembly 14 achieve mutual limiting perpendicular to the thickness direction Z through the protrusion 15 and the recess 16, improving the anti-torsion ability of the electrode terminal assembly. Moreover, the cooperation between the protrusion 15 and the recess 16 is conducive to the compact configuration of the two electrode terminal assemblies.

[0162] In some embodiments, the protrusion 15 has a first mating surface, and the recess 16 has a second mating surface. Along the second direction Y, the projection of the first mating surface and the projection of the second mating surface at least partially overlap, and the overlapping parts of the projections of the first mating surface and the second mating surface abut against each other.

[0163] The circumferential side of the first electrode terminal assembly 13 perpendicular to the thickness direction Z has a surface, and a convex portion 15 and / or a concave portion 16 are formed on the surface of the first electrode terminal assembly 13 facing the second electrode terminal assembly 14. The circumferential side of the second electrode terminal assembly 14 perpendicular to the thickness direction Z has a surface, and a convex portion 15 and / or a concave portion 16 are formed on the surface of the second electrode terminal assembly 14 facing the first electrode terminal assembly 13.

[0164] The convex portion 15 can be formed into a cylindrical shape, a prismatic shape, etc., and the present application does not make any special limitation on the specific shape of the convex portion 15. When the convex portion 15 is formed into a prismatic shape, the circumferential side of the convex portion 15 perpendicular to the thickness direction Z has a plurality of first mating surfaces; when the convex portion 15 is formed into a cylindrical shape, the circumferential side of the convex portion 15 perpendicular to the thickness direction Z has a first mating surface. The concave portion 16 is configured corresponding to the shape of the convex portion 15, so that the circumferential side of the concave portion 16 perpendicular to the thickness direction Z has one or more second mating surfaces.

[0165] In the second direction Y, the projections of the convex portion 15 and the concave portion 16 overlap. Specifically, in the second direction Y, the first mating surface of the convex portion 15 coincides with the second mating surface of the concave portion 16, and at least a part of the first mating surface and at least a part of the second mating surface are in contact. Optionally, the first mating surface and the second mating surface are configured to be able to completely fit, so that the first mating surface and the second mating surface are all in contact and abutted.

[0166] Since along the second direction Y, at least a part of the projections of the first mating surface and the second mating surface overlap, and the overlapping parts of the projections of the first mating surface and the second mating surface are in contact with each other, the first mating surface and the second mating surface limit each other, and it is difficult for the mating surfaces to move in the state of being in contact with each other. Moreover, stress concentration is not likely to occur on the mating surfaces.

[0167] In some embodiments, both the first mating surface and the second mating surface extend along the thickness direction Z, or, both the first mating surface and the second mating surface extend obliquely with respect to the thickness direction Z.

[0168] Both the first mating surface and the second mating surface can be configured to extend along the thickness direction Z, that is, both the first mating surface and the second mating surface are perpendicular to the first housing wall 111. Both the first mating surface and the second mating surface can also be configured as inclined surfaces inclined at the same angle, that is, both the first mating surface and the second mating surface extend obliquely with respect to the thickness direction Z.

[0169] Since both the first mating surface and the second mating surface extend along the thickness direction Z, the first mating surface and the second mating surface are in contact and restrict each other's movement in the second direction Y. Since both the first mating surface and the second mating surface extend obliquely with respect to the thickness direction Z, the first mating surface and the second mating surface can not only limit each other in the second direction Y perpendicular to the thickness direction Z, but also support each other in the thickness direction Z, which helps to improve the ability of the electrode terminal assembly to resist bending deformation in multiple directions.

[0170] In some embodiments, along the thickness direction Z of the first housing wall 111, the protruding portion 15 is disposed between the recessed portion 16 and the first housing wall 111. Specifically, the length of the protruding portion 15 along the thickness direction Z is less than the length of other regions where the protruding portion 15 is not provided, and the protruding portion 15 is disposed close to the first housing wall 111. The surface of the protruding portion 15 away from the first housing wall 111 is regarded as the third mating surface. The recessed portion 16 is open toward the first housing wall 111, and the recessed portion 16 has a shield with a gap between it and the first housing wall 111. The surface of the shield close to the first housing wall 111 is regarded as the fourth mating surface. The recessed portion 16 is snapped onto the protruding portion 15. The second mating surface of the recessed portion 16 and the first mating surface of the protruding portion 15 limit each other in a direction perpendicular to the thickness direction Z, and the fourth mating surface of the recessed portion 16 and the third mating surface of the protruding portion 15 limit each other in the thickness direction Z.

[0171] In some embodiments, as Figures 11 to 14 shown, the protruding portion 15 further has a third mating surface, and the recessed portion 16 further has a fourth mating surface. The third mating surface and the fourth mating surface are in contact with each other and are both parallel to the first housing wall 111. Along the thickness direction Z, the projection of the third mating surface coincides with a part of the projection of the fourth mating surface, and the fourth mating surface is located between the third mating surface and the first housing wall.

[0172] The protruding portion 15 further has a third mating surface. Both side surfaces of the protruding portion 15 along the thickness direction Z of the first housing wall 111 can be regarded as the third mating surface. The recessed portion 16 has a fourth mating surface. Both side surfaces of the recessed portion 16 along the thickness direction Z of the first housing wall 111 can be regarded as the fourth mating surface.

[0173] In an alternative embodiment, as Figure 13As shown, in the thickness direction Z of the first housing wall 111, the recess 16 is provided between the protrusion 15 and the first housing wall 111. Specifically, the length of the protrusion 15 in the thickness direction Z is less than the length of other regions where the protrusion 15 is not provided, and the protrusion 15 is arranged away from the first housing wall 111. The surface of the protrusion 15 close to the first housing wall 111 is regarded as the third mating surface. The recess 16 opens to the side away from the first housing wall 111. The recess 16 has a stepped portion that is close to and abuts against the first housing wall 111. The surface of this stepped portion away from the first housing wall 111 is regarded as the fourth mating surface. The protrusion 15 is received in the recess 16. The second mating surface of the recess 16 and the first mating surface of the protrusion 15 are mutually limited in the direction perpendicular to the thickness direction Z, and the fourth mating surface of the recess 16 and the third mating surface of the protrusion 15 are mutually limited in the thickness direction Z.

[0174] Since the third mating surface and the fourth mating surface are in contact with each other and are both parallel to the first housing wall 111, and along the thickness direction Z, the projection of the third mating surface coincides with a part of the projection of the fourth mating surface, and the fourth mating surface is located between the third mating surface and the first housing wall 111. Therefore, through the support of the recess 16 for the protrusion 15, one of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 supports and fixes the other, which helps to improve the ability of the two electrode terminal assemblies to resist bending deformation in the thickness direction Z, and also helps to enhance the ability of the region of the first housing wall 111 where the first electrode terminal assembly 13 and the second electrode terminal assembly 14 are provided to resist bending deformation.

[0175] In an optional embodiment, the first electrode terminal assembly 13 includes a first electrode terminal 131 and a first insulating member 132 that are fixedly connected to each other. The second electrode terminal assembly 14 includes a second electrode terminal 141 and a second insulating member 142 that are fixedly connected to each other. The first electrode terminal 131 and the second electrode terminal 141 are connected to the same pole ear among the positive pole ear 121 and the negative pole ear 122 and have the same polarity. At least one of the first electrode terminal 131 and the first insulating member 132 forms a protrusion 15, and at least one of the second electrode terminal 141 and the second insulating member 142 forms a recess 16. An insulating member may not be provided between the first electrode terminal 131 and the second electrode terminal 141.

[0176] Optionally, a protrusion 15 is formed on at least one of the first electrode terminal 131 and the second electrode terminal 141, and a recess 16 is formed on the first electrode terminal 131 and / or the second electrode terminal 141 corresponding to the protrusion 15. The protrusion 15 extends into the recess 16 so that the first electrode terminal 131 is in direct contact with the second electrode terminal 141.

[0177] In some embodiments, such as Figures 5 to 7 、 Figures 10 to 15As shown, the first electrode terminal assembly 13 includes a first electrode terminal 131 and a first insulating member 132 that are fixed to each other. The second electrode terminal assembly 14 includes a second electrode terminal 141 and a second insulating member 142 that are fixed to each other. At least one of the first electrode terminal 131 and the first insulating member 132 is formed with a protruding portion 15, and at least one of the second electrode terminal 141 and the second insulating member 142 is formed with a recessed portion 16. And at least a part of the first insulating member 132 and / or a part of the second insulating member 142 are provided at the position where the protruding portion 15 and the recessed portion 16 abut against each other.

[0178] The first electrode terminal assembly 13 includes a first electrode terminal 131 and a first insulating member 132. The first electrode terminal 131 partially penetrates the first housing wall 111 and is electrically connected to the electrode assembly 12. The first insulating member 132 is located between the first electrode terminal 131 and the first housing wall 111, and / or between the first electrode terminal 131 and the second electrode terminal 141.

[0179] Specifically, the first insulating member 132 can be disposed around the circumferential side surface of the first electrode terminal 131 perpendicular to the thickness direction Z, or the first insulating member 132 can be disposed in contact with the surface of the first electrode terminal 131 close to the first housing wall 111. Alternatively, the first insulating member 132 can be configured as a box shape with one side open, and the first electrode terminal 131 is placed in the box-shaped first insulating member 132. Optionally, the first insulating member 132 and the first electrode terminal 131 are bonded using an adhesive.

[0180] The second electrode terminal assembly 14 includes a second electrode terminal 141 and a second insulating member 142. The second electrode terminal 141 partially penetrates the first housing wall 111 and is electrically connected to the electrode assembly 12. The second insulating member 142 is located between the second electrode terminal 141 and the first housing wall 111, and / or between the second electrode terminal 141 and the first electrode terminal 131.

[0181] Specifically, the second insulating member 142 can be disposed around the circumferential side surface of the second electrode terminal 141 perpendicular to the thickness direction Z, or the second insulating member 142 can be disposed in contact with the surface of the second electrode terminal 141 close to the first housing wall 111. Alternatively, the second insulating member 142 can be configured as a box shape with one side open, and the second electrode terminal 141 is placed in the box-shaped second insulating member 142. Optionally, the second insulating member 142 and the second electrode terminal 141 are bonded using an adhesive.

[0182] In some embodiments, a first insulating member 132 and a second insulating member 142 are disposed between a first electrode terminal 131 and a second electrode terminal 141. At least a part of the first insulating member 132 protrudes toward the second insulating member 142 to form a protruding portion 15, and the second insulating member 142 is correspondingly recessed toward the second electrode terminal 141 to form a recessed portion 16 in response to the protruding portion 15. The protruding portion 15 is received in the recessed portion 16.

[0183] In some embodiments, only the first insulating member 132 is disposed between the first electrode terminal 131 and the second electrode terminal 141. At least a part of the first insulating member 132 can be protruded toward the second insulating member 142 to form a protruding portion 15, and the second insulating member 142 is correspondingly recessed toward the second electrode terminal 141 to form a recessed portion 16 in response to the protruding portion 15. A part of the first electrode terminal 131 can also be protruded toward the second electrode terminal 141 to form a part of the protruding portion 15, and the first insulating member 132 is disposed around the protrusion to form another part of the protruding portion 15. The second electrode terminal 141 is provided with a recessed portion 16 corresponding to the protruding portion 15. The protruding portion 15 is received in the recessed portion 16.

[0184] In some embodiments, only the second insulating member 142 is disposed between the first electrode terminal 131 and the second electrode terminal 141. At least a part of the second insulating member 142 can be recessed toward the second electrode terminal 141 to form a recessed portion 16, and the first electrode terminal 131 is correspondingly protruded toward the second electrode terminal 141 to form a protruding portion 15 in response to the recessed portion 16. A recess can also be formed on one side of the second electrode terminal 141 close to the second insulating member 142 to form a part of the recessed portion 16, and the second insulating member 142 is disposed in contact with the recess to form another part of the recessed portion 16. The protruding portion 15 is received in the recessed portion 16 and abuts against the second insulating member 142 forming the recessed portion 16.

[0185] Thus, the protruding portion 15 extends into the recessed portion 16 and abuts against the recessed portion 16. The first electrode terminal assembly 13 and the second electrode terminal assembly 14 are cooperated through the protruding portion 15 and the recessed portion 16 to realize the mutual limitation between the two at least in the second direction Y, and improve the anti-torsion ability of the two. Moreover, by disposing the insulating member between the protruding portion 15 and the recessed portion 16, the first electrode terminal 131 and the second electrode terminal 141 are insulated, which helps to reduce the occurrence probability of accidental conduction.

[0186] In some embodiments, such as Figure 14 and Figure 15As shown, the protruding portion 15 includes a first protruding portion 151 formed on the first electrode terminal 131 and a second protruding portion 153 formed on the first insulating member 132; the recessed portion 16 is formed in at least one of the second insulating member 142 and the second electrode terminal 141; along the second direction Y, both the first protruding portion 151 and the second protruding portion 153 overlap and abut against the recessed portion 16, and a part of the first insulating member 132 is interposed between the first protruding portion 151 and the recessed portion 16.

[0187] In a specific embodiment, a part of the first electrode terminal 131 protrudes towards the direction close to the second electrode terminal 141 to form the first protruding portion 151, and the first insulating member 132 is disposed around the first protruding portion 151 to form the second protruding portion 153. The second electrode terminal 141 is provided with the recessed portion 16. At least a part of the first protruding portion 151 and the second protruding portion 153 is received in the recessed portion 16, and the second protruding portion 153 formed by protruding from the first insulating member 132 is located between the first protruding portion 151 and the recessed portion 16.

[0188] Optionally, the first electrode terminal 131 formed with the first protruding portion 151 is formed by a terminal plate, and the terminal plate forms an integral part. The first insulating member 132 formed with the second protruding portion 153 can be injection molded and also forms an integral part. Similarly, the second electrode terminal 141 and the second insulating member 142 are respectively formed as integral parts.

[0189] Since the protruding portion 15 includes the first protruding portion 151 and the second protruding portion 153 and both overlap and abut against the recessed portion 16, the strength of the abutting position can be improved, and thus the ability of the overall two-electrode terminal assembly to resist torsional moment can be improved. Moreover, since a part of the first insulating member 132 is always interposed between the first protruding portion 151 and the recessed portion 16, the insulation reliability between the first electrode terminal 131 and the second electrode terminal 141 can be improved.

[0190] In some embodiments, the protruding portion 15 is formed on the first electrode terminal 131, and the recessed portion 16 includes a first recessed portion 163 formed on the second electrode terminal 141 and a second recessed portion 164 formed on the second insulating member 142. Along the second direction Y, the protruding portion 15 overlaps and abuts against both the first recessed portion 163 and the second recessed portion 164, and a part of the second insulating member 142 is interposed between the protruding portion 15 and the first recessed portion 163.

[0191] In a specific embodiment, a recess is formed on one side of the second electrode terminal 141 close to the second insulating member 142 to form the first recessed portion 163, and a part of the second insulating member 142 is disposed in contact with the first recessed portion 163 to form the second recessed portion 164. The protruding portion 15 is received in the second recessed portion 164, and the second insulating member 142 is pressed into the first recessed portion 163.

[0192] Optionally, the second electrode terminal 141 with the first recess 163 is formed by a terminal plate, which constitutes an integral part. The second insulating member 142 with the second recess 164 can be injection-molded and also constitutes an integral part. The first electrode terminal 131 and the first insulating member 132 are respectively configured as integral parts.

[0193] Since the recess 16 includes the first recess 163 and the second recess 164, and the protrusion 15 overlaps and abuts against both the first recess 163 and the second recess 164, the strength of the abutting position can be improved, and thus the ability of the overall two-electrode terminal assembly to resist torsional moment can be improved. Moreover, since the protrusion 15 and the first recess 163 are always separated by the second insulating member 142, the insulation reliability between the first electrode terminal 131 and the second electrode terminal 141 can be improved.

[0194] In some embodiments, as Figure 11 and Figure 12 shown, the recess 16 includes a first stepped portion 161 and a second stepped portion 162. The second stepped portion 162 is provided on the side of the first stepped portion 161 away from the first electrode terminal assembly 13. Along the thickness direction Z, a part of the first stepped portion 161 is located between the protrusion 15 and the first housing wall 111. The protrusion 15 is at least partially received in the stepped space formed by the first stepped portion 161. The first insulating member 132 further includes a covering portion 152, and the covering portion 152 is connected to the second protrusion 153 and at least partially received in the stepped space formed by the second stepped portion 162.

[0195] Here, the recess 16 includes a first stepped portion 161 and a second stepped portion 162.

[0196] The first stepped portion 161 is formed by the portion of the second electrode terminal 141 that becomes lower along the thickness direction Z away from the first housing wall 111, such as Figure 12 the portion within the dashed box on the left side of the second electrode terminal 141 in

[0197] The first protrusion 151 is received in the first stepped portion 161, and the insulating member is interposed between the first protrusion 151 and the first stepped portion 161.

[0198] The first insulating member 132 also has a portion covering the surface of the first protrusion 151 in contact with the recessed portion 16. Thus, in a state where the first protrusion 151 is inserted into the first stepped portion 161, the first insulating member 132 is clamped between the first protrusion 151 and the first stepped portion 161, thereby enabling an insulating state to be maintained.

[0199] As Figure 11 and Figure 12 shown, in the second electrode terminal 141, a second stepped portion 162 is further formed at a position farther from the first protrusion 151 than the first stepped portion 161. The first insulating member 132 has a covering portion 152 that covers the second stepped portion 162 from a side facing away from the first housing wall 111 in the thickness direction Z of the first housing wall 111.

[0200] The second stepped portion 162 may be a portion that is lower in the thickness direction Z of the first housing wall 111 with respect to the surface of the second electrode terminal 141 that is farthest from the first housing wall 111; the covering portion 152 may be a part of the first insulating member 132. In the thickness direction Z of the first housing wall 111, the covering portion 152 may be partially or entirely recessed into the second stepped portion 162.

[0201] The lengths of the second stepped portion 162 and the covering portion 152 in the first direction X may be determined according to the creepage distance to be provided. Generally, the longer the lengths of the second stepped portion 162 and the covering portion 152 in the first direction X are, the greater the creepage distance is and the higher the insulation reliability is.

[0202] Thus, through the cooperation of the protrusion 15 and the first stepped portion 161, the bending deformation (especially the complete deformation in a direction away from the first housing wall 111) of the second electrode terminal assembly 14 can be restricted, and further, the protrusion 15 is at least partially received in the first stepped portion 161 to reduce the space occupied by the protrusion 15 and improve the space utilization rate. By providing the covering portion 152, the creepage distance on the surfaces of the first electrode terminal 131 and the second electrode terminal 141 can be increased, and the insulation reliability can be improved. Moreover, by receiving the covering portion 152 in the second stepped portion 162, the covering portion 152 does not occupy additional space, thereby improving the space utilization rate.

[0203] In some embodiments, the recess 16 includes a first stepped portion 161 and a second stepped portion 162. The second stepped portion 162 is disposed on a side of the first stepped portion 161 away from the first electrode terminal assembly 13. Along the thickness direction Z, a part of the first stepped portion 161 is located between the protruding portion 15 and the first housing wall 111. The protruding portion 15 is at least partially received in the stepped space formed by the first stepped portion 161. The second insulating member 142 further includes a covering portion 152. The covering portion 152 is connected to the second recess 164 and is at least partially received in the stepped space formed by the second stepped portion 162.

[0204] The covering portion 152 may be a part of the second insulating member 142. Along the thickness direction Z of the first housing wall 111, the covering portion 152 may be partially or entirely recessed into the second stepped portion 162.

[0205] In a specific embodiment, a part of the second insulating member 142 is located between the protruding portion 15 and the first stepped portion 161 and is received in the stepped space of the first stepped portion 161. The second insulating member 142 covers the protruding portion 15 and extends toward the second stepped portion 162 to form the covering portion 152. That is, the covering portion 152 covers the second stepped portion 162 along the thickness direction Z of the first housing wall 111 from a side facing away from the first housing wall 111.

[0206] The lengths of the second stepped portion 162 and the covering portion 152 in the first direction X can be determined according to the creepage distance to be provided. Generally, the longer the lengths of the second stepped portion 162 and the covering portion 152 in the first direction X, the greater the creepage distance and the higher the insulation reliability.

[0207] Thus, through the cooperation of the protruding portion 15 and the first stepped portion 161, the bending deformation (especially the complete deformation in the direction away from the first housing wall 111) of the second electrode terminal assembly 14 can be restricted. Further, the protruding portion 15 is at least partially received in the first stepped portion 161 to reduce the space occupied by the protruding portion 15 and improve the space utilization rate. By providing the covering portion 152, the creepage distance on the surfaces of the first electrode terminal 131 and the second electrode terminal 141 can be increased, and the insulation reliability can be improved. Moreover, by receiving the covering portion 152 in the second stepped portion 162, the covering portion 152 does not occupy extra space, thereby improving the space utilization rate.

[0208] In some embodiments, as Figure 12 shown, along the thickness direction Z, the overlapping portion of the protruding portion 15 and the recess 16 is an overlapping region. The length of the overlapping region in the first direction X is L11, and L11 is in the range of 0.5 mm to 6 mm.

[0209] For example, the length L11 of the overlapping area along the first direction X may be 0.5 mm, 1 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, or 6 mm, or may be other values within the range of 0.5 mm to 6 mm.

[0210] Therefore, by setting the length of the overlapping area along the first direction X to be smaller, the matching strength between the protruding portion 15 and the recessed portion 16 can be improved, and it is beneficial to improve the space utilization.

[0211] In some embodiments, the electrode assembly 12 includes a first electrode piece and a second electrode piece with opposite polarities, the first electrode terminal 131 is electrically connected to the first electrode piece, and the second electrode terminal 141 is electrically connected to the second electrode piece.

[0212] The electrode assembly 12 includes a first electrode sheet and a second electrode sheet with opposite polarities. The first electrode sheet and the second electrode sheet are led out through electrode tabs and are directly or indirectly connected to the electrode terminal. As an example, the electrode tabs include a positive electrode tab 121 and a negative electrode tab 122. The first electrode sheet leads out the positive electrode tab 121, and the second electrode sheet leads out the negative electrode tab 122.

[0213] Part of the first electrode terminal 131 passes through the first housing wall 111 and is electrically connected to the positive electrode tab 121 or the negative electrode tab 122 . Part of the second electrode terminal 141 passes through the first housing wall 111 and is electrically connected to the positive electrode tab 121 or the negative electrode tab 122 .

[0214] Thus, electrode terminals with opposite polarities can be arranged on the first shell wall 111 of the battery cell 10, which is beneficial to reducing the space occupied by the busbar 17 and the like, and is also beneficial to arranging other structural parts such as heat exchange parts on other shell walls of the battery cell 10, which is beneficial to improving the volume utilization of the battery.

[0215] In some embodiments, the first insulating member 132 is partially disposed between the first electrode terminal 131 and the first housing wall 111 , and the second insulating member 142 is partially disposed between the second electrode terminal 141 and the first housing wall 111 .

[0216] Thus, both the first electrode terminal 131 and the second electrode terminal 141 can be insulated from the first case wall 111 .

[0217] In some embodiments, Figure 13 and Figure 14 As shown, a first recess 1111 and a second recess 1112 are formed in the first shell wall 111. The first recess 1111 and the second recess 1112 are located on the side of the first shell wall 111 away from the accommodating space 11a along the thickness direction Z, at least a portion of the first insulating member 132 is located in the first recess 1111, and at least a portion of the second insulating member 142 is located in the second recess 1112.

[0218] The first recess 1111 and the second recess 1112 are recessed areas formed by thinning the first housing wall 111 in the thickness direction Z of the first housing wall 111. The top view shape of the recessed area (the shape observed along the thickness direction Z of the first housing wall 111) can be configured to accommodate at least a part of the first insulating member 132 and at least a part of the second insulating member 142. The recessed depth of the recessed area can be substantially the same as or slightly lower than the height (the dimension in the thickness direction Z of the first housing wall 111) of the first insulating member 132 or the second insulating member 142.

[0219] One or two or more first recesses 1111 and / or second recesses 1112 may be formed on the first housing wall 111.

[0220] Corresponding to the recessed area, convex portions are respectively formed on the portion of the first insulating member 132 located in the first recess 1111 and the portion of the second insulating member 142 located in the second recess 1112. The convex portions can respectively engage with the first recess 1111 and the second recess 1112, so as to be able to restrict the movement of the first insulating member 132 and the second insulating member 142 relative to the first housing wall 111 in the surface direction of the first housing wall 111 (the direction perpendicular to the thickness direction Z of the first housing wall 111).

[0221] In some embodiments, the first recess 1111 and the second recess 1112 form the same recess.

[0222] Thereby, it is beneficial to improve the installation strength of the insulating member relative to the first housing wall 111, reduce the possibility of the insulating member shifting along the surface of the first housing wall 111, and also facilitate the positioning of the insulating member and the first housing wall 111 with respect to each other during assembly.

[0223] In some embodiments, as Figure 13 shown, the recessed depth of the first recess 1111 in the thickness direction Z is H1, and the wall thickness of the portion of the first housing wall 111 around the first recess 1111 in the thickness direction Z is H. H1 is in the range of 30% to 70% of H.

[0224] The recessed depth H1 of the first recess 1111 in the thickness direction Z can account for 30% to 70% of the wall thickness H of the portion of the first housing wall 111 around the first recess 1111 in the thickness direction Z, that is, H1 / H is in the range of 30% to 70%. For example, it can be 30%, 36%, 45%, 53%, 59%, 66%, 70%. Of course, other values within the above range can also be used.

[0225] Thus, the first recess 1111 accommodates part of the insulating member, which can not only reduce the space occupied by the electrode terminal assembly, but also reduce the impact of forming the recess on the strength of the first housing wall 111.

[0226] In some embodiments, as Figure 9 , Figure 10 and Figure 16 shown, the first electrode terminal 131 includes a first main body portion 1311 and a first extension portion 1312 that are connected to each other. The second electrode terminal 141 includes a second main body portion 1411 and a second extension portion 1412 that are connected to each other. Along the first direction X, at least part of the first extension portion 1312 and at least part of the second extension portion 1412 are located between the first main body portion 1311 and the second main body portion 1411, and the first extension portion 1312 and the second extension portion 1412 are arranged at intervals with partial overlap along the second direction Y.

[0227] The first electrode terminal assembly 13 includes a first electrode terminal 131, and the first electrode terminal 131 includes a first main body portion 1311 and a first extension portion 1312. In Figure 9 , the part of the first electrode terminal 131 to the left of the left dotted line is used as the first main body portion 1311, and the remaining part (excluding the first protrusion 151) of the first electrode terminal 131 is used as the first extension portion 1312. Similarly, the second electrode terminal assembly 14 includes a second electrode terminal 141, and the second electrode terminal 141 includes a second main body portion 1411 and a second extension portion 1412. Among them, the part of the second electrode terminal 141 to the right of the right dotted line is used as the second main body portion 1411, and the remaining part of the second electrode terminal 141 is used as the second extension portion 1412.

[0228] In Figure 9 shown specific example, the first main body portion 1311 and the second main body portion 1411 are formed to be generally rectangular with long sides extending along the second direction Y, and the first main body portion 1311 and the second main body portion 1411 are arranged along the first direction X. The first extension portion 1312 and the second extension portion 1412 are both formed to be generally rectangular with long sides extending along the first direction X, and the first extension portion 1312 and the second extension portion 1412 are arranged at intervals with partial overlap along the second direction Y. Thus, along the first direction X, the first extension portion 1312 and the second extension portion 1412 are located between the first main body portion 1311 and the second main body portion 1411.

[0229] Of course, Figure 9 shown is only a specific embodiment, and the shapes and arrangement positions of the first main body portion 1311, the first extension portion 1312, the second main body portion 1411, and the second extension portion 1412 are not limited to Figure 9 shown embodiment.

[0230] InFigure 9 In the specific embodiment shown, along the second direction Y, the second main body 1411 is substantially flush with the outer edge of the first extension portion 1312 (the edge close to the long side of the first housing wall 111), and the first main body 1311 is substantially flush with the outer edge of the second extension portion 1412 (the edge close to the long side of the first housing wall 111). However, they may not be flush. Optionally, one of the outer edge of the second main body 1411 and the outer edge of the first extension portion 1312 is closer to the long side of the first housing wall 111, and / or one of the outer edge of the first main body 1311 and the outer edge of the second extension portion 1412 is closer to the long side of the first housing wall 111.

[0231] Thus, the electrode terminal can be designed to have a main body and an extension, which can stably connect the electrode terminal to the first housing wall 111, increase the heat dissipation area of the electrode terminal, and increase the connection area and connection reliability between the electrode terminal and the busbar 17. In addition, since the first extension 1312 and the second extension 1412 are located between the first main body 1311 and the second main body 1411 along the first direction X, the bending strength of the region where the electrode terminal is provided in the first housing wall 111 can be enhanced by the cooperation of the two terminal plates.

[0232] In some embodiments, Figures 11 to 14 As shown, the first electrode terminal assembly 13 also includes a first terminal disc 1313 connected to the first electrode terminal 131, and at least a portion of the first terminal disc 1313 is arranged on the side of the first shell wall 111 facing the accommodating space 11a. The second electrode terminal assembly 14 also includes a second terminal disc 1413 connected to the second electrode terminal 141, and at least a portion of the second terminal disc 1413 is arranged on the side of the first shell wall 111 facing the accommodating space 11a. The first main body 1311 and the first terminal disc 1313 are directly connected via a first connecting column 1314; the second main body 1411 and the second terminal disc 1413 are directly connected via a second connecting column 1414.

[0233] The first electrode terminal assembly 13 further includes a first terminal plate 1313. Either the first main body 1311 or the first extension 1312 is electrically connected to the first terminal plate 1313, the first main body 1311 and the first extension 1312 are located on a side of the first housing wall 111 away from the accommodation space 11a, and the first terminal plate 1313 is located on a side of the first housing wall 111 facing the accommodation space 11a. Optionally, either the first main body 1311 or the first extension 1312 and the first terminal plate 1313 are fixed to the first housing wall 111 through a first connecting column 1314 or the like.

[0234] The second electrode terminal assembly 14 further includes a second terminal plate 1413. Either the second main body 1411 or the second extension 1412 is electrically connected to the second terminal plate 1413, the second main body 1411 or the second extension 1412 is located on a side of the first housing wall 111 away from the accommodation space 11a, and the second terminal plate 1413 is located on a side of the first housing wall 111 facing the accommodation space 11a. Optionally, either the second main body 1411 or the second extension 1412 and the second terminal plate 1413 are fixed to the first housing wall 111 through a second connecting column 1414 or the like.

[0235] The first main body 1311, the first extension 1312, the second main body 1411, and the second extension 1412 are located outside the housing 11 of the battery cell 10 and can be used to connect with the busbar 17, etc. The first terminal plate 1313 and the second terminal plate 1413 are located inside the housing 11 of the battery cell 10 and can be used to electrically connect with the tab. The terminal plate and the terminal plate can be made of metal, such as copper, aluminum, etc.

[0236] Optionally, the first main body 1311 and the first extension 1312 are considered as a whole, the second main body 1411 and the second extension 1412 are considered as a whole, and the first terminal plate 1313 and the second terminal plate 1413 are each configured as a substantially flat plate. The shape of the flat plate can be designed according to the situation, for example, it can be rectangular, circular, Figure 9 L-shape shown etc.

[0237] Optionally, along the thickness direction Z perpendicular to the first shell wall 111, the first terminal plate 1313 and the second terminal plate 1413 can partially overlap and abut with each other via a portion of the insulating member. The insulating member here is an insulating member different from the first insulating member 132 and the second insulating member 142, for example, it can be an insulating member located below the first shell wall 111.

[0238] Since the electrode terminal and the terminal plate can be connected together by the connecting post, the electrode terminal assembly as a whole can play the role of drawing current from the electrode assembly 12. In addition, the connecting post is provided in the main body, so that the electrode terminal can be reliably fixed to the first housing wall 111 in the main body.

[0239] In some embodiments, Figure 9 , Figure 10 and Figure 16As shown, the protrusion 15 is disposed on one side of the first main body portion 1311 close to the second extension portion 1412, and the recess 16 is disposed on one side of the second extension portion 1412 close to the first main body portion 1311, and / or the protrusion 15 is disposed on one side of the first extension portion 1312 close to the second main body portion 1411, and the recess 16 is disposed on one side of the second main body portion 1411 close to the first extension portion 1312, and / or the protrusion 15 is disposed on one side of the first extension portion 1312 close to the second extension portion 1412, and the recess 16 is disposed on one side of the second extension portion 1412 close to the first extension portion 1312.

[0240] The position where the mating structure of the protrusion 15 and the recess 16 is disposed can be between the first main body portion 1311 and the second extension portion 1412, between the second main body portion 1411 and the first extension portion 1312, and between the first extension portion 1312 and the second extension portion 1412. The mating structure of the protrusion 15 and the recess 16 can be disposed at at least one of these positions.

[0241] When the mating structure of the protrusion 15 and the recess 16 is disposed between the first main body portion 1311 and the second extension portion 1412, the position of the first main body portion 1311 close to the second extension portion 1412 protrudes toward the second extension portion 1412, and a recess is formed at the corresponding protruding position of the second extension portion 1412. There is a first insulating member 132 and / or a second insulating member 142 between the protrusion and the recess.

[0242] When the mating structure of the protrusion 15 and the recess 16 is disposed between the second main body portion 1411 and the first extension portion 1312, the position of the first extension portion 1312 close to the second main body portion 1411 protrudes toward the second main body portion 1411, and a recess is formed at the corresponding protruding position of the second main body portion 1411. There is a first insulating member 132 and / or a second insulating member 142 between the protrusion and the recess.

[0243] When the mating structure of the protrusion 15 and the recess 16 is disposed between the first extension portion 1312 and the second extension portion 1412, the position of the first extension portion 1312 close to the second extension portion 1412 protrudes toward the second extension portion 1412, and a recess is formed at the corresponding protruding position of the second extension portion 1412. There is a first insulating member 132 and / or a second insulating member 142 between the protrusion and the recess.

[0244] Since the recess 16 provided on the second extension portion 1412 can be abutted by the protrusion 15 provided on the first main body portion 1311 and / or the first extension portion 1312, and the protrusion 15 provided on the first extension portion 1312 can be abutted by the recess 16 provided on the second main body portion 1411, the torsional moment can be effectively resisted, and the risk of breakage of the extension portion due to its relatively long formation can be reduced.

[0245] In some embodiments, as Figure 16 shown, the length of the protruding portion 15 in the second direction Y is W11, and the length of the first housing wall 111 in the second direction Y is W. W11 is in the range of 10% to 90% of W.

[0246] Let W11 represent the length of the protruding portion 15 in the second direction Y, and let W represent the length of the first housing wall 111 in the second direction Y.

[0247] The length W11 of the protruding portion 15 in the second direction Y can account for 10% to 90% of the length W of the first housing wall 111 in the second direction Y, that is, W11 / W is in the range of 10% to 90%. For example, it can account for 10%, 15%, 20%, 30%, 50%, 70%, 90%. Of course, it can also be other values within the above range.

[0248] Thus, the first housing wall 111 can be fully utilized in the second direction Y, and the supporting force between the first electrode terminal assembly 13 and the second electrode terminal assembly 14 can be effectively improved, the bending strength of the electrode terminals can be increased, and the strength of the first housing wall 111 around the electrode terminals can also be enhanced.

[0249] In some embodiments, W11 is in the range of 5 mm to 50 mm.

[0250] Exemplarily, the length W11 of the overlapping region in the second direction Y can be 5 mm, 6 mm, 8 mm, 10 mm, 15 mm, 20 mm, 30 mm, 40 mm, 50 mm. Of course, it can also be other values within the range of 5 mm to 50 mm.

[0251] Thus, the size of the overlapping region in the second direction Y can be determined according to the size of the first housing wall 111 in the second direction Y. By setting the size of the overlapping region in the second direction Y to be relatively large, the supporting force between the first electrode terminal assembly 13 and the second electrode terminal 141 can be improved, the bending strength of the electrode terminals can be increased, and the strength of the first housing wall 111 around the electrode terminals can also be enhanced.

[0252] In a second aspect, as Figure 2 and Figure 18 shown, an embodiment of the present application further provides a battery device 100, including a box body 20 and at least two battery cells 10 as described in the first aspect above.

[0253] Thereby, a battery can be provided in which the strength of the electrode terminal assembly in the battery cell 10 is enhanced, which helps to improve the use reliability of the battery.

[0254] In some embodiments, as Figure 17As shown in the figure, the first electrode terminal assembly 13 includes a first electrode terminal 131. The first electrode terminal 131 includes a first main body portion 1311 and a first extension portion 1312 that are connected to each other. The second electrode terminal assembly 14 includes a second electrode terminal 141. The second electrode terminal 141 includes a second main body portion 1411 and a second extension portion 1412 that are connected to each other. Along the first direction X, at least part of the first extension portion 1312 and at least part of the second extension portion 1412 are located between the first main body portion 1311 and the second main body portion 1411, and the first extension portion 1312 and the second extension portion 1412 are arranged at intervals with partial overlap along the second direction Y. Among them, both the first direction X and the second direction Y are perpendicular to the thickness direction Z of the first housing wall 111, and the first direction X and the second direction Y are perpendicular to each other. Each battery cell 10 is arranged along the second direction Y. And, among adjacent battery cells 10, the first extension portion 1312 of one battery cell 10 and the second extension portion 1412 of another battery cell 10 are arranged along the second direction Y and are electrically connected through a bus bar 17.

[0255] Since the bus bar 17 is connected to the first extension portion 1312 and the second extension portion 1412, and the first extension portion 1312 and the second extension portion 1412 are located between the first main body portion 1311 and the second main body portion 1411, the bending resistance of this connection part is relatively strong. Therefore, the first electrode terminal 131, the second electrode terminal 141, and the first housing wall 111 are not easily bent, deformed, or broken, thereby improving the use reliability of the battery.

[0256] In some embodiments, as Figure 18 shown, at least one box wall of the box body 20 has a boss 201. The boss 201 is formed by the box wall bulging towards the direction away from the battery cell 10. The boss 201 forms a receiving portion on the side facing the battery cell 10. Along the direction perpendicular to the box wall where the boss 201 is formed, within the same projection plane, the projections of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 do not exceed the projection of the boss 201, and at least part of the first electrode terminal assembly 13 and / or the second electrode terminal assembly 14 is received in the receiving portion.

[0257] Thereby, it is possible to only increase the height of the box body 20 at the position where the first electrode terminal assembly 13, the second electrode terminal 141, and the bus bar 17 are located, so as to be able to reduce the size of the battery, and it is also beneficial to improve the volume utilization rate of the battery.

[0258] In a third aspect, an embodiment of the present application further provides an electrical device, including the battery cell 10 described in the first aspect above, or the battery device 100 described in the second aspect above. The battery cell 10 or the battery device 100 is used to store or provide electrical energy.

[0259] Thus, it is possible to provide an electrical device with a battery device 100 in which the electrode terminals of the battery cell 10 are not easily twisted or have a small degree of twisting, improving the reliability of use of the electrical device and also being conducive to reducing the maintenance time of the electrical device.

[0260] In a fourth aspect, an embodiment of the present application further provides an energy storage device, including the battery cell 10 described in the first aspect above, or the battery device 100 described in the second aspect above. The battery cell 10 or the battery device 100 is used to store or provide electrical energy.

[0261] Thus, it is possible to provide an energy storage device with a battery device 100 in which the electrode terminals of the battery cell 10 are not easily twisted or have a small degree of twisting, improving the reliability of use of the energy storage device and also being conducive to reducing the maintenance time of the energy storage device.

[0262] A specific embodiment of the present application will be described below.

[0263] When a force perpendicular to the thickness direction Z is applied to the electrode terminal, it may be twisted. When a force in the thickness direction Z is applied, it may be deformed, causing the electrode terminal to fail.

[0264] For the force perpendicular to the thickness direction Z, a riveting structure with a protrusion 15 and a recess 16 can be formed between the two electrode terminal assemblies. The two are engaged with each other to achieve limiting in the direction perpendicular to the thickness direction Z, improving the force-bearing strength of the electrode terminal in this direction. Further, a groove can be provided on the first housing wall 111, and at least part of the electrode terminal assembly is placed in the groove. The groove limits the electrode terminal assembly in the direction perpendicular to the thickness direction Z. To improve the structural compactness, only one groove can be constructed on the first housing wall 111, and at least part of the first electrode terminal assembly 13 and at least part of the second electrode terminal assembly 14 are both placed in the groove.

[0265] For the force in the thickness direction Z, part of the first electrode terminal assembly 13 and part of the second electrode terminal assembly 14 can be overlapped with each other in the thickness direction Z so that they can support each other, improving the force-bearing strength in the thickness direction Z.

[0266] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that, Comprising: A housing having a receiving space, the housing including a first housing wall; An electrode assembly disposed at least partially in the receiving space; A first electrode terminal assembly and a second electrode terminal assembly disposed on the first housing wall, Along a direction perpendicular to the thickness direction of the first housing wall, a part of the first electrode terminal assembly and a part of the second electrode terminal assembly overlap and abut against each other.

2. The battery cell according to claim 1, wherein The first electrode terminal assembly includes a first electrode terminal, the second electrode terminal assembly includes a second electrode terminal, and the first electrode terminal and the second electrode terminal are arranged along a first direction; Along a second direction, a part of the first electrode terminal assembly and a part of the second electrode terminal assembly overlap and abut against each other, Wherein, both the first direction and the second direction are perpendicular to the thickness direction of the first housing wall, and the first direction and the second direction are perpendicular to each other.

3. The battery cell according to claim 2, wherein At least one of the first electrode terminal assembly and the second electrode terminal assembly has a protruding portion, Along the second direction, the protruding portion of the first electrode terminal assembly abuts against the second electrode terminal assembly, and / or, the protruding portion of the second electrode terminal assembly abuts against the first electrode terminal assembly.

4. The battery cell according to claim 3, wherein The first electrode terminal assembly includes the first electrode terminal and a first insulating member fixed to each other, the second electrode terminal assembly includes the second electrode terminal and a second insulating member fixed to each other, At least one of the first insulating member and the second insulating member forms the protruding portion.

5. The battery cell according to claim 3, wherein One of the first electrode terminal assembly and the second electrode terminal assembly has the protruding portion, and the other has a recessed portion. Along the second direction, the protruding portion and the recessed portion overlap and abut against each other.

6. The battery cell according to claim 5, wherein The protruding portion has a first mating surface, and the recessed portion has a second mating surface, Along the second direction, the projection of the first mating surface and the projection of the second mating surface at least partially coincide, and the overlapping part of the projections of the first mating surface and the second mating surface abuts against each other.

7. The battery cell according to claim 6, wherein Both the first mating surface and the second mating surface extend along the thickness direction, or Both the first mating surface and the second mating surface extend obliquely with respect to the thickness direction.

8. The battery cell according to claim 6, wherein The protruding portion further has a third mating surface, and the recessed portion further has a fourth mating surface, The third mating surface and the fourth mating surface abut against each other and are both parallel to the first housing wall, Along the thickness direction, the projection of the third mating surface and the projection of the fourth mating surface partially coincide, and the fourth mating surface is located between the third mating surface and the first housing wall.

9. The battery cell according to any one of claims 5 to 8, characterized in that the first electrode terminal assembly includes a first electrode terminal and a first insulating member fixed to each other, and the second electrode terminal assembly includes a second electrode terminal and a second insulating member fixed to each other; at least one of the first electrode terminal and the first insulating member is formed with the protruding portion, at least one of the second electrode terminal and the second insulating member is formed with the recessed portion, and at least a part of the first insulating member and / or a part of the second insulating member is disposed at a position where the protruding portion and the recessed portion are in contact with each other.

10. The battery cell according to claim 9, characterized in that the protruding portion includes a first protruding portion formed on the first electrode terminal and a second protruding portion formed on the first insulating member; the recessed portion is formed in at least one of the second insulating member and the second electrode terminal; along the second direction, both the first protruding portion and the second protruding portion overlap and abut against the recessed portion, and a part of the first insulating member is interposed between the first protruding portion and the recessed portion.

11. The battery cell according to claim 9, characterized in that the protruding portion is formed on the first electrode terminal, the recessed portion includes a first recessed portion formed on the second electrode terminal and a second recessed portion formed on the second insulating member, along the second direction, the protruding portion overlaps and abuts against both the first recessed portion and the second recessed portion, and a part of the second insulating member is interposed between the protruding portion and the first recessed portion.

12. The battery cell according to claim 10, characterized in that, The recessed portion includes a first stepped portion and a second stepped portion, and the second stepped portion is disposed on a side of the first stepped portion away from the first electrode terminal assembly; along the thickness direction, a part of the first stepped portion is located between the protruding portion and the first housing wall, and at least a part of the protruding portion is received in a stepped space formed by the first stepped portion, the first insulating member further includes a covering portion, and the covering portion is connected to the second protruding portion and at least a part of the covering portion is received in a stepped space formed by the second stepped portion.

13. The battery cell according to claim 11, characterized in that the recessed portion includes a first stepped portion and a second stepped portion, and the second stepped portion is disposed on a side of the first stepped portion away from the first electrode terminal assembly; along the thickness direction, a part of the first stepped portion is located between the protruding portion and the first housing wall, and at least a part of the protruding portion is received in a stepped space formed by the first stepped portion, the second insulating member further includes a covering portion, and the covering portion is connected to the second recessed portion and at least a part of the covering portion is received in a stepped space formed by the second stepped portion.

14. The battery cell according to claim 12 or 13, characterized in that along the thickness direction, a part where the protruding portion and the recessed portion overlap is an overlapping region, a length of the overlapping region in the first direction is L11, and L11 ranges from 0.5 mm to 6 mm.

15. The battery cell according to claim 9, characterized in that: The electrode assembly includes a first electrode sheet and a second electrode sheet with opposite polarities, the first electrode terminal is electrically connected to the first electrode sheet, and the second electrode terminal is electrically connected to the second electrode sheet.

16. The battery cell according to claim 15, characterized in that: The first insulating member is partially disposed between the first electrode terminal and the first housing wall. The second insulating member is partially disposed between the second electrode terminal and the first housing wall.

17. The battery cell according to claim 16, characterized in that: A first recess and a second recess are formed in the first housing wall, and the first recess and the second recess are located on a side of the first housing wall away from the accommodation space along the thickness direction. At least a portion of the first insulating member is located in the first recess, and at least a portion of the second insulating member is located in the second recess.

18. The battery cell according to claim 17, characterized in that: The first recessed portion has a recessed depth H1 along the thickness direction, and the first shell wall has a wall thickness H along the thickness direction of a portion of the first recessed portion located around the first recessed portion. H1 is in the range of 30% to 70% of H.

19. The battery cell according to any one of claims 2 to 8, characterized in that: The first electrode terminal includes a first main body portion and a first extension portion connected to each other, The second electrode terminal includes a second main body portion and a second extension portion connected to each other, Along the first direction, at least a portion of the first extension portion and at least a portion of the second extension portion are located between the first body portion and the second body portion, and the first extension portion and the second extension portion are spaced apart and partially overlapped along the second direction.

20. The battery cell according to claim 19, characterized in that: The first electrode terminal assembly further includes a first terminal plate connected to the first electrode terminal, wherein at least a portion of the first terminal plate is disposed on a side of the first housing wall facing the accommodation space. The second electrode terminal assembly further includes a second terminal plate connected to the second electrode terminal, and at least a portion of the second terminal plate is disposed on a side of the first housing wall facing the accommodation space. The first main body and the first terminal plate are directly connected via a first connecting column; The second main body and the second terminal plate are directly connected via a second connecting column.

21. The battery cell according to claim 20, characterized in that: The protruding portion is disposed on a side of the first main body portion close to the second extending portion, and the recessed portion is disposed on a side of the second extending portion close to the first main body portion, and / or, The protruding portion is disposed on a side of the first extension portion close to the second main body portion, and the recessed portion is disposed on a side of the second main body portion close to the first extension portion, and / or, The protruding portion is disposed on a side of the first extending portion close to the second extending portion, and the recessed portion is disposed on a side of the second extending portion close to the first extending portion.

22. The battery cell according to any one of claims 3 to 8, characterized in that the length of the protruding portion along the second direction is W11, and the length of the first housing wall along the second direction is W, W11 is in the range of 10% to 90% of W.

23. The battery cell according to claim 22, characterized in that W11 is in the range of 5 mm to 50 mm.

24. A battery device, characterized in that, It includes a box body and at least two battery cells according to any one of claims 1 to 23.

25. The battery device according to claim 24, characterized in that the first electrode terminal assembly includes a first electrode terminal, and the first electrode terminal includes a first main body portion and a first extension portion connected to each other, the second electrode terminal assembly includes a second electrode terminal, and the second electrode terminal includes a second main body portion and a second extension portion connected to each other, Along the first direction, at least part of the first extension portion and at least part of the second extension portion are located between the first main body portion and the second main body portion, and the first extension portion and the second extension portion are arranged at intervals with partial overlap along the second direction, wherein the first direction and the second direction are both perpendicular to the thickness direction of the first housing wall, and the first direction and the second direction are perpendicular to each other. Each battery cell is arranged along the second direction, and in adjacent battery cells, the first extension portion of one battery cell and the second extension portion of another battery cell are arranged along the second direction and are electrically connected through a bus bar.

26. The battery device according to claim 25, characterized in that at least one box wall of the box body has a boss, the boss is formed by the box wall bulging towards the direction away from the battery cell, and the boss forms a receiving portion on the side facing the battery cell, Along the direction perpendicular to the box wall where the boss is formed, in the same projection plane, the projections of the first electrode terminal assembly and the second electrode terminal assembly do not exceed the projection of the boss, and the first electrode terminal assembly and / or the second electrode terminal assembly are at least partially received in the receiving portion.

27. An electrical device, characterized in that, The electrical device includes a plurality of battery cells according to any one of claims 1 to 23, or at least one battery device according to any one of claims 24 to 26, and the battery cell or the battery device is used to store or provide electric energy.

28. An energy storage device, characterized in that, The energy storage device includes a plurality of battery cells according to any one of claims 1 to 23, or a battery device according to any one of claims 24 to 26, and the battery cell or the battery device is used to store electric energy or provide electric energy.

Images