Battery cell, battery apparatus, electrical apparatus, and energy storage apparatus

Abstract

Embodiments of the present disclosure provide a battery cell, a battery apparatus, an electrical apparatus, and an energy storage apparatus. The battery cell comprises: a casing, having an accommodating space and comprising a first casing wall; an electrode assembly, at least partially provided in the accommodating space; and a first electrode terminal assembly and a second electrode terminal assembly, provided on the first casing wall. In a direction perpendicular to the thickness direction of the first casing wall, a part of the first electrode terminal assembly and a part of the second electrode terminal assembly overlap and abut against each other.

Description

Battery cell, battery device, electric device and energy storage device

[0001] Cross-reference to Related Applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202421970103.6, filed on August 14, 2024, entitled “Battery cell, battery device, electric device and energy storage device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] Embodiments of the present disclosure relate to the technical field of battery, in particular to a battery cell, a battery device, an electric device and an energy storage device. BACKGROUND

[0004] With the popularization and promotion of the concept of green development, new energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like.

[0005] A battery usually includes a plurality of battery cells, each of which usually includes a shell, an electrode assembly and an electrode terminal electrically connecting the electrode assembly. The electrode terminals of the plurality of battery cells are usually connected to each other by a busbar. During use of the battery, the electrode terminals are repeatedly subjected to external forces and may be subjected to stress fatigue and even breakage failure. Therefore, how to improve the strength of the electrode terminal is one of the problems to be solved. SUMMARY

[0006] To solve the above technical problems, the present disclosure provides a battery cell, a battery device, an electric device and an energy storage device capable of improving the strength of the electrode terminal.

[0007] In a first aspect, the embodiments of the present disclosure provide a battery cell, comprising: a shell having a receiving space, the shell comprising a first shell wall; an electrode assembly at least partially disposed in the receiving space; a first electrode terminal assembly and a second electrode terminal assembly disposed on the first shell wall, and a portion of the first electrode terminal assembly and a portion of the second electrode terminal assembly overlap and abut each other along a direction perpendicular to a thickness direction of the first shell wall.

[0008] In the embodiments of the present disclosure, 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 arranged in a concentrated manner, which can improve the strength of the electrode terminal assembly arrangement area in the first shell wall, and is conducive to reducing the risk of deformation of the area. In addition, by arranging the first electrode terminal assembly and the second electrode terminal assembly in a concentrated manner, it is conducive to fully utilizing the other space of the first shell wall, and also conducive to 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 locally overlap 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 limited in the direction perpendicular to the thickness direction, which reduces the external force or torque in the direction perpendicular to the thickness direction that each electrode terminal assembly bears, improves the torsional resistance of the electrode terminal assembly, and thus helps to improve the strength and installation reliability of the electrode terminals.

[0009] In some embodiments, the first electrode terminal assembly includes a first electrode terminal, and the second electrode terminal assembly includes a second electrode terminal, 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 the first direction and the second direction are both perpendicular to the thickness direction of the first shell wall, and the first direction and the second direction are perpendicular to each other.

[0010] 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, the mutual limiting of the first electrode terminal assembly and the second electrode terminal assembly can be realized in a simple structure, and the first electrode terminal assembly and the second electrode terminal assembly can be compactly arranged in the first direction and the second direction.

[0011] In some embodiments, at least one of the first electrode terminal assembly and the second electrode terminal assembly has a protrusion, along the second direction, the protrusion of the first electrode terminal assembly abuts against the second electrode terminal assembly, and / or the protrusion of the second electrode terminal assembly abuts against the first electrode terminal assembly.

[0012] In this way, the first electrode terminal assembly and / or the second electrode terminal assembly are limited in the second direction by the protrusion. When one of the electrode terminal assemblies is subjected to a torsional torque along the first shell wall, the torque not only acts on the electrode terminal assembly itself, but also acts on the other electrode terminal assembly through the protrusion. In this way, the two electrode terminal assemblies can jointly resist the torsional torque, the rotational torque borne by each electrode terminal assembly is reduced, the torsional resistance of the electrode terminal assembly is improved, and the strength and installation reliability of the electrode terminals are improved.

[0013] In some embodiments, the first electrode terminal assembly includes a first electrode terminal and a first insulating piece fixed to each other, and the second electrode terminal assembly includes a second electrode terminal and a second insulating piece fixed to each other, at least one of the first insulating piece and the second insulating piece forms a protrusion.

[0014] Since the first insulating piece and / or the second insulating piece forms the protrusion, the protrusion is located between the first electrode terminal and the second electrode terminal, so that the first electrode terminal and the second electrode terminal are limited by the protrusion, the torsion resistance of the electrode terminal assembly is improved, and the first electrode terminal and the second electrode terminal are kept at a relatively safe distance, which helps to reduce the probability of accidental conduction.

[0015] In some embodiments, one of the first electrode terminal assembly and the second electrode terminal assembly has a protrusion, and the other has a recess, along the second direction, the protrusion overlaps and abuts against the recess.

[0016] In this way, the protrusion and the recess are limited by each other, the first electrode terminal assembly and the second electrode terminal assembly are limited by the protrusion and the recess in the direction perpendicular to the thickness direction, the torsion resistance of the electrode terminal assembly is improved, and the cooperation of the protrusion and the recess is conducive to the compact configuration of the two electrode terminal assemblies.

[0017] In some embodiments, the protrusion has a first cooperation surface, the recess has a second cooperation surface, along the second direction, a projection of the first cooperation surface at least partially overlaps a projection of the second cooperation surface, and the overlapping part of the projection of the first cooperation surface and the projection of the second cooperation surface abut against each other.

[0018] Since along the second direction, the projection of the first cooperation surface at least partially overlaps the projection of the second cooperation surface, and the overlapping part of the projection of the first cooperation surface and the projection of the second cooperation surface abut against each other, the first cooperation surface and the second cooperation surface are limited by each other, and the cooperation surfaces are difficult to move in the state of abutting against each other. Moreover, the cooperation surfaces are not prone to stress concentration.

[0019] In some embodiments, the first cooperation surface and the second cooperation surface both extend along the thickness direction, or the first cooperation surface and the second cooperation surface both extend obliquely relative to the thickness direction.

[0020] Since the first cooperation surface and the second cooperation surface both extend along the thickness direction, the first cooperation surface and the second cooperation surface are adhered to each other and limit the movement of each other in the second direction. Since the first cooperation surface and the second cooperation surface both extend obliquely relative to the thickness direction, the first cooperation surface and the second cooperation surface can be limited by each other in the second direction perpendicular to the thickness direction, and can support each other in the thickness direction, which helps to improve the bending deformation resistance of the electrode terminal assembly in multiple directions.

[0021] In some embodiments, the protrusion further has a third mating surface, the recess further has a fourth mating surface, the third mating surface and the fourth mating surface abut each other and are both parallel to the first housing wall, along the thickness direction, a projection of the third mating surface partially overlaps with a projection of the fourth mating surface, and the fourth mating surface is located between the third mating surface and the first housing wall.

[0022] Since the third mating surface and the fourth mating surface are both parallel to the first housing wall, and along the thickness direction, a projection of the third mating surface partially overlaps with a projection of the fourth mating surface, and the fourth mating surface is located between the third mating surface and the first housing wall, through the support of the recess to the protrusion, one of the first electrode terminal assembly and the second electrode terminal assembly supports and fixes the other, which helps to improve the bending deformation resistance of the two electrode terminal assemblies in the thickness direction, and also helps to strengthen the bending deformation resistance of the region of the first housing wall where the first electrode terminal assembly and the second electrode terminal assembly are arranged.

[0023] In some embodiments, the first electrode terminal assembly includes a first electrode terminal and a first insulating piece fixed to each other, the second electrode terminal assembly includes a second electrode terminal and a second insulating piece fixed to each other, at least one of the first electrode terminal and the first insulating piece is formed with a protrusion, at least one of the second electrode terminal and the second insulating piece is formed with a recess, and at least a part of the first insulating piece and / or a part of the second insulating piece is arranged at a position where the protrusion and the recess abut each other.

[0024] In this way, the protrusion extends into the recess and abuts against the recess, the first electrode terminal assembly and the second electrode terminal assembly are matched through the protrusion and the recess, realizing mutual limiting between the two at least in the second direction, and improving the torsional resistance of the two. Moreover, by arranging the insulating piece between the protrusion and the recess, the first electrode terminal and the second electrode terminal are kept insulated, which helps to reduce the probability of accidental conduction.

[0025] In some embodiments, the protrusion includes a first protrusion formed on the first electrode terminal and a second protrusion formed on the first insulating piece; the recess is formed on at least one of the second insulating piece and the second electrode terminal; along the second direction, the first protrusion and the second protrusion both overlap with and abut against the recess, and the first protrusion is separated from the recess by a part of the first insulating piece.

[0026] Since the protrusion includes the first protrusion and the second protrusion and both of them overlap with and abut against the recess, the strength of the abutting position can be improved, and thus the torsional moment resistance of the two electrode terminal assemblies as a whole can be improved. Moreover, since the first protrusion is always separated from the recess by the first insulating piece, the insulation reliability between the first electrode terminal and the second electrode terminal can be improved.

[0027] In some embodiments, the protrusion is formed on the first electrode terminal, the recess includes a first recess formed on the second electrode terminal and a second recess formed on the second insulating member, along the second direction, the protrusion overlaps and abuts against both the first recess and the second recess, and the protrusion and the first recess are separated by a portion of the second insulating member.

[0028] Since the recess includes the first recess and the second recess and the protrusion overlaps and abuts against both the first recess and the second recess, the strength of the abutment position can be improved, and thus the ability of the overall torsional moment of the two electrode terminal assemblies can be improved. Moreover, since the protrusion and the first recess are always separated by the second insulating member, the insulation reliability between the first electrode terminal and the second electrode terminal can be improved.

[0029] In some embodiments, the recess includes a first step portion and a second step portion, the second step portion is disposed on a side of the first step portion away from the first electrode terminal assembly; along the thickness direction, a portion of the first step portion is located between the protrusion and the first housing wall, the protrusion is at least partially accommodated in a step space formed by the first step portion, and the first insulating member further includes a covering portion connected to the second protrusion and at least partially accommodated in a step space formed by the second step portion.

[0030] Thus, the cooperation of the protrusion and the first step portion can limit the bending deformation (especially the complete deformation in the direction away from the first housing wall) of the second electrode terminal assembly, and further at least partially accommodate the protrusion in the first step portion 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, the recess includes a first step portion and a second step portion, the second step portion is disposed on a side of the first step portion away from the first electrode terminal assembly; along the thickness direction, a portion of the first step portion is located between the protrusion and the first housing wall, the protrusion is at least partially accommodated in a step space formed by the first step portion, and the second insulating member further includes a covering portion connected to the second recess and at least partially accommodated in a step space formed by the second step portion.

[0032] Thus, the bending deformation (particularly, the complete deformation in the direction away from the first shell wall) of the second electrode terminal assembly can be limited by the cooperation between the protrusion and the first step portion, and the protrusion is at least partially accommodated in the first step portion, so that the space occupied by the protrusion is reduced, and the space utilization is improved. By arranging 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 is improved. Moreover, by accommodating the covering portion in the second step portion, the covering portion does not occupy additional space, so that the space utilization is improved.

[0033] In some embodiments, along the thickness direction, the portion where the protrusion overlaps with the recess is an overlapping region, and the length of the overlapping region along the first direction is L11, which is in the range of 0.5mm to 6mm.

[0034] Thus, by arranging the length of the overlapping region along the first direction to be small, the cooperation strength between the protrusion and the recess can be improved, and the space utilization is also improved.

[0035] In some embodiments, the electrode assembly includes first and second pole pieces with opposite polarities, the first electrode terminal is electrically connected to the first pole piece, and the second electrode terminal is electrically connected to the second pole piece.

[0036] Thus, the electrode terminals with opposite polarities can be arranged on the first shell wall of the battery monomer, so that the space occupied by the busbar and the like is reduced, and other structural members such as heat exchange members can be arranged on other shell walls of the battery monomer, so that the volume utilization of the battery is improved.

[0037] In some embodiments, the first insulating member is partially arranged between the first electrode terminal and the first shell wall, and the second insulating member is partially arranged between the second electrode terminal and the first shell wall.

[0038] Thus, the first electrode terminal and the second electrode terminal can be insulated from the first shell wall.

[0039] In some embodiments, the first and second recesses are formed in the first shell wall, the first and second recesses are located on the side of the first shell 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.

[0040] Thus, the installation strength of the insulating member relative to the first shell wall is improved, the possibility of displacement of the insulating member along the surface of the first shell wall is reduced, and the positioning of the insulating member and the first shell wall relative to each other during assembly is facilitated.

[0041] In some embodiments, the first recess has a depth H1 along the thickness direction, and a portion of the first housing wall around the first recess has a wall thickness H along the thickness direction, H1 being in a range of 30% to 70% of H.

[0042] In this way, the first recess accommodates part of the insulating member, which not only reduces the space occupied by the electrode terminal assembly, but also reduces the impact of the recess on the strength of the first housing wall.

[0043] In some embodiments, the first electrode terminal includes a first body portion and a first extension portion connected to each other, and the second electrode terminal includes a second body portion and a second extension portion connected to each other, at least part of the first extension portion and at least part of the second extension portion are located between the first body portion and the second body portion along the first direction, and the first extension portion and the second extension portion are arranged in a partially overlapping manner along the second direction.

[0044] In this way, the electrode terminal can be designed to have a body portion and an extension portion, which not only facilitates the stable connection of the electrode terminal relative to the first housing wall, but also facilitates the increase of the heat dissipation area of the electrode terminal, and facilitates the increase of the connection area and the connection reliability of the electrode terminal and the busbar. In addition, since the first extension portion and the second extension portion are located between the first body portion and the second body portion along the first direction, the bending strength of the region of the first housing wall where the electrode terminal is arranged can be enhanced through the cooperation of the two terminal plates.

[0045] 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 being arranged 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 being arranged on the side of the first housing wall facing the accommodation space, the first body portion and the first terminal plate are directly connected through a first connecting column, and the second body portion and the second terminal plate are directly connected through a second connecting column.

[0046] Since the electrode terminal and the terminal plate can be connected together through the connecting column, the electrode terminal and the terminal plate can collectively function to draw current from the electrode assembly as an electrode terminal assembly. Moreover, the connecting column is arranged on the body portion, so that the electrode terminal can be reliably fixed to the first housing wall at the body portion.

[0047] In some embodiments, the protruding portion is arranged on the side of the first body portion close to the second extension portion, the recessed portion is arranged on the side of the second extension portion close to the first body portion, and / or the protruding portion is arranged on the side of the first extension portion close to the second body portion, the recessed portion is arranged on the side of the second body portion close to the first extension portion, and / or the protruding portion is arranged on the side of the first extension portion close to the second extension portion, and the recessed portion is arranged on the side of the second extension portion close to the first extension portion.

[0048] Since the recess provided in the second extension portion can be abutted by the protrusion provided in the first main body portion and / or the first extension portion, and the protrusion provided in the first extension portion can be abutted by the recess provided in the second main body portion, the torsional moment can be effectively resisted, and the risk of the extension portion being broken due to being formed too long can be reduced.

[0049] In some embodiments, the length of the protrusion along the second direction is W11, the length of the first housing wall along the second direction is W, and W11 is in the range of 10% to 90% of W.

[0050] In this way, the first housing wall along the second direction can be fully utilized, and the support force between the first electrode terminal assembly and the second electrode terminal assembly can be reliably improved, the bending strength of the electrode terminal can be improved, and the strength of the first housing wall around the electrode terminal can also be strengthened.

[0051] In some embodiments, W11 is in the range of 5 mm to 50 mm.

[0052] In this way, the size of the overlapping region along the second direction can be determined according to the size of the first housing wall along the second direction, and by setting the size of the overlapping region along the second direction to be larger, the support force between the first electrode terminal assembly and the second electrode terminal can be improved, the bending strength of the electrode terminal can be improved, and the strength of the first housing wall around the electrode terminal can also be strengthened.

[0053] In a second aspect, the embodiments of the present disclosure further provide a battery device, including a box body and at least two battery monomers as described in the first aspect above.

[0054] In this way, a battery with strengthened strength of the electrode terminal assembly in the battery monomer can be provided, and the use reliability of the battery can be improved.

[0055] In some embodiments, the first electrode terminal assembly includes a first electrode terminal, 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, 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 in 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 monomer is arranged along the second direction, and in adjacent battery monomers, the first extension portion of one battery monomer and the second extension portion of another battery monomer are arranged along the second direction and are electrically connected by a busbar.

[0056] Since the busbar is connected to the first extension part and the second extension part, the first extension part and the second extension part are located between the first body part and the second body part, the bending resistance of the connection part is strong, thus the first electrode terminal, the second electrode terminal and the first shell wall are not easy to be bent and deformed or broken, thereby improving the use reliability of the battery.

[0057] In some embodiments, at least one of the box walls of the box has a boss formed by bulging the box wall in a direction away from the battery monomer, the boss forms a containing part on the side facing the battery monomer, in the same projection plane along the direction perpendicular to the box wall where the boss is formed, the projection of the first electrode terminal assembly and the second electrode terminal assembly does not exceed the projection of the boss, and the first electrode terminal assembly and / or the second electrode terminal assembly is at least partially contained in the containing part.

[0058] Thus, the height of the box at the position where the first electrode terminal assembly, the second electrode terminal and the busbar are located can be increased only, thereby the size of the battery can be reduced, and the volume utilization of the battery is also improved.

[0059] In a third aspect, the embodiments of the present disclosure also provide a power utilization device, which comprises the battery monomer of the first aspect or the battery device of the second aspect, and the battery monomer or the battery device is used to store or provide electric energy.

[0060] Thus, the power utilization device with the battery monomer whose electrode terminal is not easy to be twisted or has a small degree of twist can be provided, the use reliability of the power utilization device is improved, and the maintenance time of the power utilization device is also reduced.

[0061] In a fourth aspect, the embodiments of the present disclosure also provide an energy storage device, which comprises the battery monomer of the first aspect or the battery device of the second aspect, and the battery monomer or the battery device is used to store or provide electric energy.

[0062] Thus, the energy storage device with the battery monomer whose electrode terminal is not easy to be twisted or has a small degree of twist can be provided, the use reliability of the energy storage device is improved, and the maintenance time of the energy storage device is also reduced.

[0063] The above description is only a summary of the technical solutions of the present disclosure, in order to more clearly understand the technical means of the present disclosure, the specific embodiments of the present disclosure can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present disclosure more obvious and easy to understand, the following specific embodiments of the present disclosure are described. BRIEF DESCRIPTION OF DRAWINGS

[0064] FIG. 1 is a schematic view of a power utilization device provided by an embodiment of the present disclosure as a vehicle;

[0065] FIG. 2 is a schematic diagram of a battery according to an embodiment of the present disclosure;

[0066] FIG. 3 is an exploded schematic diagram of a battery cell according to an embodiment of the present disclosure;

[0067] FIG. 4 is a top view schematic diagram of the battery cell of FIG. 3;

[0068] FIG. 5 is a top view schematic diagram of a battery cell according to an embodiment of the present disclosure;

[0069] FIG. 6 is a top view schematic diagram of a battery cell according to another embodiment of the present disclosure;

[0070] FIG. 7 is a top view schematic diagram of a battery cell according to yet another embodiment of the present disclosure;

[0071] FIG. 8 is a top view schematic diagram of a battery cell according to still another embodiment of the present disclosure;

[0072] FIG. 9 is a top view schematic diagram of a first housing wall according to an embodiment of the present disclosure;

[0073] FIG. 10 is a top view schematic diagram of a first housing wall according to another embodiment of the present disclosure;

[0074] FIG. 11 is a cross-sectional view along A-A of FIG. 10;

[0075] FIG. 12 is a partial enlarged view of portion C of FIG. 11;

[0076] FIG. 13 is a cross-sectional view along B-B of FIG. 10;

[0077] FIG. 14 is an exploded schematic diagram of the first housing wall of FIG. 10;

[0078] FIG. 15 is a partial enlarged view of portion D of FIG. 14;

[0079] FIG. 16 is a top view schematic diagram of a first housing wall according to yet another embodiment of the present disclosure;

[0080] FIG. 17 is a schematic diagram of battery cells connected by a busbar according to an embodiment of the present disclosure;

[0081] FIG. 18 is a schematic diagram of a battery provided with a boss according to an embodiment of the present disclosure.

[0082] Reference Signs 1000, vehicle; 100, battery device; 10, battery cell; 20, case; 20A, upper case; 20B, lower case; 201, boss; 200, controller; 300, motor; 11, housing; 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 body portion; 1312, first extension portion; 1313, first terminal disc; 1314, first connecting column; 132, first insulating member; 14, second electrode terminal assembly; 141, second electrode terminal; 1411, second body portion; 1412, second extension portion; 1413, second terminal disc; 1414, second connecting column; 142, second insulating member; 15, protruding portion; 151, first protruding portion; 152, covering portion; 153, second protruding portion; 16, recessed portion; 161, first step portion; 162, second step portion; 163, first recessed portion; 164, second recessed portion; 17, bus member; X, first direction; Z, thickness direction; Y, second direction. DETAILED DESCRIPTION

[0083] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0084] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms "comprising" and "having," and any variations thereof, are intended to cover inclusions not exclusive of other non- specified items.

[0085] In the description of the embodiments of the present disclosure, the technical terms "first", "second", "third", "fourth" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0086] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. The occurrence of the phrase in various places in the specification is not necessarily all referring to the same embodiment, nor is it necessarily referring to a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0087] In the description of the embodiments of the present disclosure, the term "and / or" is merely an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0088] In the description of the embodiments of the present disclosure, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, operate or be used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present disclosure.

[0089] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood broadly, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0090] In the description of the embodiments of the present disclosure, unless otherwise explicitly specified and limited, the technical term "contact" should be understood broadly, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0091] Next, the present disclosure will be described in detail.

[0092] With the popularization and popularization of the concept of green development, new energy batteries are more and more widely used in life and industry, for example, new energy vehicles equipped with batteries have been widely used, in addition, batteries are also more and more widely used in energy storage fields and the like.

[0093] The battery usually includes a plurality of battery monomers, the battery monomer usually includes a shell, an electrode assembly, and an electrode terminal electrically connecting the electrode assembly, and the electrode terminals of the plurality of battery monomers are usually connected to each other through a busbar. In the use process of the battery, there is a bad situation that the electrode terminal is repeatedly subjected to external force and stress fatigue or even breaks down. Therefore, how to improve the strength of the electrode terminal is one of the problems to be solved.

[0094] Research shows that if the two electrode terminals are arranged compactly and the parts of the two electrode terminals abut each other, the two electrode terminals are limited by the abutting position, which can prevent the electrode terminals from being twisted after being subjected to external force to some extent, improve the anti-twisting ability of the electrode terminals, and further improve the strength of the electrode terminals.

[0095] Based on such technical concept, the battery cell provided by the present disclosure includes: a shell having an accommodation space, the shell including a first shell 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 shell wall, and a part of the first electrode terminal assembly and a part of the second electrode terminal assembly have overlap and abut each other along a direction perpendicular to the thickness direction of the first shell wall.

[0096] Since a part of the first electrode terminal assembly and a part of the second electrode terminal assembly abut each other, the first electrode terminal assembly and the second electrode terminal assembly are arranged in a concentrated manner, which can improve the strength of the electrode terminal assembly arrangement area in the first shell wall and is conducive to reducing the risk of deformation of the area. In addition, by arranging the first electrode terminal assembly and the second electrode terminal assembly in a concentrated manner, it is conducive to fully utilizing other space of the first shell wall, and also conducive to 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 partially overlap and abut each other in the direction perpendicular to the thickness direction, the position where the first electrode terminal assembly and the second electrode terminal assembly abut each other can be limited in the direction perpendicular to the thickness direction, which reduces the external force or torque in the direction perpendicular to the thickness direction that each electrode terminal assembly bears, improves the anti-twisting ability of the electrode terminal assembly, and thus helps to improve the strength and installation reliability of the electrode terminals.

[0097] The battery cell involved in the embodiments of the present disclosure can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0098] The battery cell can 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-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited thereto.

[0099] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive electrode sheet and the negative electrode sheet. The separator is disposed between the positive electrode sheet and the negative electrode sheet, and can function to prevent short circuiting between the positive and negative electrodes while allowing the active ions to pass through. The positive electrode sheet generally includes a positive current collector and a positive active material attached to the positive current collector. By way of example, the positive current collector can be an aluminum foil. The negative electrode sheet generally includes a negative current collector and a negative active material attached to the negative current collector. By way of example, the negative current collector can be a copper foil.

[0100] In some embodiments, the electrode assembly is provided with tabs that can conduct current out of the electrode assembly. The tabs include positive tabs and negative tabs. The positive tabs can be connected to the positive current collector, and the negative tabs can be connected to the negative current collector.

[0101] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel case, an aluminum case, a plastic case (e.g., polypropylene), a composite metal case (e.g., a copper-aluminum composite case), or an aluminum-plastic film, among others.

[0102] By way of example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shapes of battery cells, including a square battery cell, a blade battery cell, a multi-prismatic battery cell (e.g., a hexagonal battery cell), among others, without limitation.

[0103] In some embodiments, the housing is provided with two electrode terminals that are electrically connected to the tabs. The electrode terminals can be directly connected to the tabs, or can be connected to the tabs via adapters, among others.

[0104] A battery apparatus as referred to in embodiments of the present disclosure can include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection via a busbar.

[0105] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; by way of example, the battery cell assembly can be a battery module formed by arranging and securing a plurality of battery cells into a single module. By way of example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0106] In some embodiments, the battery device can be a battery pack, which includes a box and one or more battery cell assemblies accommodated in the box.

[0107] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box by fixing the battery module in the box.

[0108] As an example, the battery cell assembly can also be accommodated in the box by fixing a plurality of battery cells directly in the box.

[0109] As an example, the box can include a first box and a second box. The first box and the second box are buckled so that an enclosed space is formed inside the box to accommodate the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0110] As an example, the box can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0111] As an example, the box can be part of the chassis structure of the vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0112] In some embodiments, the battery device refers to an energy storage device, which includes a box, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0113] The technical solutions described in the embodiments of the present disclosure are applicable to various electric devices using battery cells and battery devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0114] In the following, the electric device of the embodiments of the present disclosure is taken as a vehicle 1000 as an example for illustration.

[0115] FIG. 1 is a structural schematic diagram of a vehicle 1000 according to an embodiment of the present disclosure. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. As shown in FIG. 1, the vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0116] In some embodiments of the present disclosure, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0117] FIG. 2 is a structural exploded schematic diagram of a battery according to some embodiments of the present disclosure. As shown in FIG. 2, the battery device 100 includes a box body 20, which can be divided into an upper box body 20A and a lower box body 20B, and the upper box body 20A and the lower box body 20B are opposite to each other to form an arrangement space of the battery monomer 10 between them.

[0118] In the battery device 100, the battery monomer 10 can be multiple, and the multiple battery monomers 10 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery monomers 10 are connected in series and in parallel. The multiple battery monomers 10 can be directly connected in series, in parallel, or in a mixed manner, and then the whole formed by the multiple battery monomers 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 that the multiple battery monomers 10 are first connected in series, in parallel, or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, and are accommodated in the arrangement space defined by the upper box body 20A and the lower box body 20B. The battery device 100 can further include other structures, for example, the battery device 100 can further include a current combiner (not shown in FIG. 2) for realizing electrical connection between the multiple battery monomers 10.

[0119] Hereinafter, a detailed description will be given in conjunction with the drawings.

[0120] FIG. 3 is an exploded view of a battery cell according to an embodiment of the present disclosure; FIG. 4 is a top view of the battery cell of FIG. 3; FIG. 5 is a top view of a battery cell according to an embodiment of the present disclosure; FIG. 6 is a top view of a battery cell according to another embodiment of the present disclosure; FIG. 7 is a top view of a battery cell according to yet another embodiment of the present disclosure; FIG. 8 is a top view of a battery cell according to still another embodiment of the present disclosure; FIG. 9 is a top view of a first housing wall according to an embodiment of the present disclosure; FIG. 10 is a top view of a first housing wall according to another embodiment of the present disclosure; FIG. 11 is a cross-sectional view of A-A of FIG. 10; FIG. 12 is a partial enlarged view of portion C of FIG. 11; FIG. 13 is a cross-sectional view of B-B of FIG. 10; FIG. 14 is an exploded view of the first housing wall of the embodiment of FIG. 10; FIG. 15 is a partial enlarged view of portion D of FIG. 14; FIG. 16 is a top view of a first housing wall according to yet another embodiment of the present disclosure; FIG. 17 is a schematic view of battery cells connected by a busbar according to an embodiment of the present disclosure; and FIG. 18 is a schematic view of a battery provided with a boss according to an embodiment of the present disclosure.

[0121] In the description of embodiments of the present disclosure, the direction in which arrow X is located is referred to as a "first direction", the direction in which arrow Y is located is referred to as a "second direction", and the direction in which arrow Z is located is referred to as a "thickness direction of the first housing wall" and a "thickness direction". The first direction and the second direction can intersect each other, and in some specific embodiments, can be perpendicular to each other. The first direction and the second direction can both intersect the thickness direction of the first housing wall, and in some specific embodiments, can be perpendicular to the thickness direction of the first housing wall. For example, the first direction, the second direction, and the thickness direction of the first housing wall can all be perpendicular to each other.

[0122] A first aspect of the present disclosure provides a battery cell 10, as shown in FIGS. 3 and 4, including: an outer shell 11 having a receiving space 11a, the outer shell 11 including a first housing wall 111; an electrode assembly 12 at least partially disposed in the receiving space 11a; a first electrode terminal assembly 13 and a second electrode terminal assembly 14 disposed on the first housing wall 111, and a portion of the first electrode terminal assembly 13 and a portion of the second electrode terminal assembly 14 overlap and abut each other in a direction perpendicular to the thickness direction Z of the first housing wall 111.

[0123] In some embodiments, the battery cell 10 includes the outer shell 11. The outer shell 11 is used to encapsulate components such as the electrode assembly 12 and the electrolyte. The outer shell 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 shell), or an aluminum-plastic film, etc.

[0124] 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 serves to protect the electrode assembly 12, and a sealing bag is further included between the housing 11 and the electrode assembly 12, which serves to encapsulate the electrode assembly 12 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum laminate film. As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc. In the embodiments shown in FIGS. 3 to 16, a square battery cell is taken as an example for illustration.

[0125] In some embodiments, as shown in FIG. 3, the housing 11 includes a plurality of housing walls, and a portion of the housing walls enclose a space having an opening through which the electrode assembly 12 can enter the housing, and the opening can be closed by another housing wall (e.g., the first housing wall 111) to form a containing space 11a for containing the electrode assembly 12 and the electrolyte, etc. The housing 11 can be provided with one or more openings. The housing wall (e.g., the first housing wall 111) closing the opening can also be configured as a top cover.

[0126] The thickness direction Z of the first housing wall 111 refers to the direction of the first housing wall 111 toward the containing space 11a.

[0127] In some embodiments, as shown in FIG. 3, the battery cell 10 includes the electrode assembly 12. The electrode assembly 12 includes a positive electrode sheet, a negative electrode sheet, and a separator. During charging and discharging of the battery cell 10, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode sheet and the negative electrode sheet, which can serve to prevent short circuiting of the positive and negative electrodes while allowing the active ions to pass through. In the embodiment shown in FIG. 3, as the electrode assembly 12, two laminated jelly rolls formed by laminating and winding the positive electrode sheet, the negative electrode sheet, and the separator are shown, but the electrode assembly 12 is not limited to the jelly-roll type shown in FIG. 3, and can also be a stacked sheet type or other structural forms.

[0128] The electrode assembly 12 is provided with tabs that can conduct current from the electrode assembly 12. In the specific embodiment shown in FIG. 3, the electrode assembly 12 is shown as having a positive tab 121 and a negative tab 122, which are disposed on the same side of the electrode assembly 12 along the thickness direction Z of the first housing wall 111 and are both disposed near one end of the electrode assembly 12 along the first direction X. Of course, the positive tab 121 and the negative tab 122 can also be disposed on opposite sides of the electrode assembly 12; the positive tab 121 and the negative tab 122 can also be disposed near both ends of the electrode assembly 12 along the first direction X, respectively.

[0129] The first direction X is the direction of extension of the longest side of the first housing wall 111, and is perpendicular to the thickness direction Z of the first housing wall 111. Of course, in some embodiments, the side of the first housing wall whose direction of extension is consistent with the first direction X can not be the longest side, but a relatively long side.

[0130] In some embodiments, as shown in FIG. 3, the first electrode terminal assembly 13 and the second electrode terminal assembly 14 are arranged on the shell 11. 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 electrically connected to the tab, which can be directly connected to the tab or indirectly connected to the tab through an adapter. For ease of description, in the embodiments of the present disclosure, the housing wall on which the first electrode terminal assembly 13 and the second electrode terminal assembly 14 are arranged is referred to as the first housing wall 111.

[0131] Optionally, the first electrode terminal assembly 13 and the second electrode terminal assembly 14 can have the same polarity or opposite polarity.

[0132] In some embodiments, the first electrode terminal assembly 13 and the second electrode terminal assembly 14 are arranged close to each other, and a portion of the first electrode terminal assembly 13 abuts against a portion of the second electrode terminal assembly 14. The first electrode terminal assembly 13 and the second electrode terminal assembly 14 can be arranged near one end of the first housing wall 111 or at a substantially central position of the first housing wall 111.

[0133] Specifically, in the direction perpendicular to the thickness direction Z of the first housing wall 111, a portion of the first electrode terminal assembly 13 and a portion of the second electrode terminal assembly 14 have an overlap, and the abutting faces of the overlapping portions are close to each other. The abutting faces of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 can be configured to have a shape that fits each other, such as a plane, an inclined plane, a concave-convex surface, an arc surface, and the like.

[0134] In the embodiments of the present disclosure, since a portion of the first electrode terminal assembly 13 and a portion of the second electrode terminal assembly 14 abut each other, the first electrode terminal assembly 13 and the second electrode terminal assembly 14 are arranged in a concentrated manner, which can improve the strength of the electrode terminal assembly arrangement area in the first housing wall 111, and is conducive to reducing the risk of deformation of this area. In addition, by arranging the first electrode terminal assembly 13 and the second electrode terminal assembly 14 in a concentrated manner, it is conducive to fully utilizing the other space of the first housing wall 111, and also conducive to 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 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 each other can be positioned in the direction perpendicular to the thickness direction Z, which reduces the external force or torque in the direction perpendicular to the thickness direction Z that each electrode terminal assembly bears, improves the torsional resistance of the electrode terminal assembly, and thus helps to improve the strength and installation reliability of the electrode terminals.

[0135] In some embodiments, as shown in FIGS. 5-17, the first electrode terminal assembly 13 includes first electrode terminals 131, and the second electrode terminal assembly 14 includes second electrode terminals 141, and the first electrode terminals 131 and the second electrode terminals 141 are arranged along a first direction X; along a second direction Y, a portion of the first electrode terminal assembly 13 and a portion of the second electrode terminal assembly 14 overlap and abut 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.

[0136] The second direction Y refers to the extension direction of the shortest side of the first housing wall 111, and the second direction Y is perpendicular to the thickness direction Z and the first direction X of the first housing wall 111, respectively. Of course, in some embodiments, the side in the first housing wall whose extension direction is consistent with the second direction Y can not be the shortest side, but a relatively short side.

[0137] Since the first electrode terminals 131 and the second electrode terminals 141 are arranged along the first direction X, and a portion of the first electrode terminal assembly 13 and a portion of the second electrode terminal assembly 14 overlap and abut each other along the second direction Y, the mutual positioning of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 can be achieved in a simple structure, and it is conducive to arranging the first electrode terminal assembly 13 and the second electrode terminal assembly 14 in a compact manner in the first direction X and the second direction Y.

[0138] In some embodiments, as shown in FIGS. 5 to 17, at least one of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 has a protrusion 15, and the protrusion 15 of the first electrode terminal assembly 13 abuts against the second electrode terminal assembly 14 along the second direction Y, and / or the protrusion 15 of the second electrode terminal assembly 14 abuts against the first electrode terminal assembly 13.

[0139] The first electrode terminal assembly 13 and the second electrode terminal assembly 14 have an overlap along the first direction X.

[0140] In some embodiments, the portion of the first electrode terminal assembly 13 that overlaps the second electrode terminal assembly 14 has a protrusion 15, and the second electrode terminal assembly 14 is configured with a recess 16 corresponding to the protrusion 15 (see, for example, FIG. 12). The protrusion 15 protrudes from the first electrode terminal assembly 13 toward the second electrode terminal assembly 14 and abuts against the recess 16 of the second electrode terminal assembly 14. The protrusion 15 has a surface facing the second direction Y and abutting against the recess 16, by which the protrusion 15 abuts against the second electrode terminal assembly 14.

[0141] In some embodiments, the portion of the second electrode terminal assembly 14 that overlaps the first electrode terminal assembly 13 has a protrusion 15, and the first electrode terminal assembly 13 is configured with a recess 16 corresponding to the protrusion 15. The protrusion 15 protrudes from the second electrode terminal assembly 14 toward the first electrode terminal assembly 13 and abuts against the recess 16 of the first electrode terminal assembly 13. The protrusion 15 has a surface facing the second direction Y and abutting against the recess 16, by which the protrusion 15 abuts against the first electrode terminal assembly 13.

[0142] In some embodiments, the portion of the first electrode terminal assembly 13 that overlaps the second electrode terminal assembly 14 has a protrusion 15, and the portion of the second electrode terminal assembly 14 that overlaps the first electrode terminal assembly 13 also has a protrusion 15. One side of the protrusion 15 of the first electrode terminal assembly 13 along the second direction Y abuts against one side of the protrusion 15 of the second electrode terminal assembly 14 along the second direction Y.

[0143] The protrusions 15 can be provided in multiple or one, and the number of the protrusions 15 is not specially limited in the present disclosure. Optionally, multiple protrusions 15 are provided in one of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 and spaced apart along the second direction Y. At least one protrusion 15 is provided in the other of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 and inserted into the gap between the multiple protrusions 15 and abuts against one side of the adjacent protrusion 15 along the second direction Y.

[0144] Thus, the first electrode terminal assembly 13 and / or the second electrode terminal assembly 14 are limited in the second direction Y by the protrusion 15, and when one of the electrode terminal assemblies is subjected to a torsional moment along the first housing wall 111, the moment not only acts on the electrode terminal assembly itself, but also acts on the other electrode terminal assembly through the protrusion 15, so that the two electrode terminal assemblies can jointly resist the torsional moment, reducing the rotational moment borne by each electrode terminal assembly, improving the torsional resistance of the electrode terminal assembly, and helping to improve the strength and installation reliability of the electrode terminal.

[0145] In an optional embodiment, the first electrode terminal assembly 13 includes the first electrode terminal 131 and the first insulating member 132 fixed to each other, the second electrode terminal assembly 14 includes the second electrode terminal 141 and the second insulating member 142 fixed to each other, and 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 the protrusion 15. The first insulating member 132 is located at least between the first electrode terminal 131 and the first housing wall 111, and the second insulating member 142 is located at least between the second electrode terminal 141 and the second housing wall.

[0146] In some embodiments, as shown in FIGS. 5-9, the first electrode terminal assembly 13 includes the first electrode terminal 131 and the first insulating member 132 fixed to each other, the second electrode terminal assembly 14 includes the second electrode terminal 141 and the second insulating member 142 fixed to each other, and at least one of the first insulating member 132 and the second insulating member 142 forms the protrusion 15.

[0147] The first electrode terminal assembly 13 includes the first electrode terminal 131 and the first insulating member 132. The first electrode terminal 131 is partially inserted through the first housing wall 111 to be 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.

[0148] Specifically, the first insulating member 132 can be arranged around the circumferential surface of the first electrode terminal 131 perpendicular to the thickness direction Z, or the first insulating member 132 can be arranged to adhere to the surface of the first electrode terminal 131 close to the first housing wall 111, or the first insulating member 132 can be configured as an open-sided box type, and the first electrode terminal 131 is placed in the box type first insulating member 132.

[0149] The second electrode terminal assembly 14 includes a second electrode terminal 141 and a second insulating member 142. The second electrode terminal 141 is electrically connected to the electrode assembly 12 through the first housing wall 111 partially, and the second insulating member 142 is disposed 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.

[0150] Specifically, the second insulating member 142 can be disposed around the circumferential surface of the second electrode terminal 141 perpendicular to the thickness direction Z, or the second insulating member 142 can be attached to the surface of the second electrode terminal 141 close to the first housing wall 111, or the second insulating member 142 can be configured as an open-sided box type, and the second insulating member 142 is disposed in the box type second insulating member 142.

[0151] 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 part of the first insulating member 132 protrudes in the direction close to the second electrode terminal assembly 14 to form a protruding portion 15. One side of the second direction Y of the protruding portion 15 abuts the first electrode terminal 131. Alternatively, a plurality of protruding portions 15 are disposed apart from each other along the second direction Y, and part of the first electrode terminal 131 is located between two adjacent protruding portions 15 and abuts one side of the second direction Y of the protruding portion 15, respectively.

[0152] In some embodiments, as shown in FIGS. 5 to 9, the second insulating member 142 is disposed between the first electrode terminal 131 and the second electrode terminal 141, and at least part of the second insulating member 142 protrudes in the direction close to the first electrode terminal assembly 13 to form a protruding portion 15. One side of the second direction Y of the protruding portion 15 abuts the second electrode terminal 141. Alternatively, a plurality of protruding portions 15 are disposed apart from each other along the second direction Y, and part of the second electrode terminal 141 is located between two adjacent protruding portions 15 and abuts one side of the second direction Y of the protruding portion 15, respectively.

[0153] Further, as shown in FIGS. 8 and 9, the first insulating member 132 and the second insulating member 142 are disposed between the first electrode terminal 131 and the second electrode terminal 141. Part of the first insulating member 132 protrudes in the direction close to the second electrode terminal assembly 14 to form a protruding portion 15, and part of the second insulating member 142 protrudes in the direction close to the first electrode terminal assembly 13 to form a protruding portion 15, and at least one side of the second direction Y of the protruding portion 15 of the first insulating member 132 abuts one side of the second direction Y of the protruding portion 15 of the second insulating member 142.

[0154] In an optional embodiment, a portion of the first electrode terminal 131 can be configured to protrude in a direction close to the second electrode terminal assembly 14 to form a part of the protrusion 15, and the first insulating member 132 can be configured to surround the protrusion to form another part of the protrusion 15, and the protrusion 15 can abut against the second electrode terminal 141 or the second insulating member 142. Alternatively, a portion of the first electrode terminal 131 can be configured to protrude in a direction close to the second electrode terminal assembly 14 to form the protrusion 15, and the protrusion 15 can abut against the second insulating member 142.

[0155] In another optional embodiment, as shown in FIG. 7, a portion of the second electrode terminal 141 can be configured to protrude in a direction close to the first electrode terminal assembly 13 to form a part of the protrusion 15, and the second insulating member 142 can be configured to surround the protrusion to form another part of the protrusion 15, and the protrusion 15 can abut against the first electrode terminal 131 or the first insulating member 132. Alternatively, a portion of the second electrode terminal 141 can be configured to protrude in a direction close to the first electrode terminal assembly 13 to form the protrusion 15, and the protrusion 15 can abut against the first insulating member 132.

[0156] The protrusion 15 can be formed in the entire thickness direction of the electrode terminal, or can be formed in a partial range in the thickness direction of the electrode terminal.

[0157] Further, the first electrode terminal 131 and the second electrode terminal 141 can be respectively configured to protrude in a direction close to each other, and the first insulating member 132 and / or the second insulating member 142 can be arranged between the protrusion of the first electrode terminal 131 and the protrusion of the second electrode terminal 141, and the first insulating member 132 and / or the second insulating member 142 can be arranged between the protrusion of the second electrode terminal 141 and the protrusion of the first electrode terminal 131. One of the first insulating member 132 and the second insulating member 142 can protrude along the protrusion of the electrode terminal on the same side to separate the two electrode terminals, or both of the first insulating member 132 and the second insulating member 142 can protrude along the protrusion of the electrode terminal on the same side to separate the two electrode terminals.

[0158] Since the first insulating member 132 and / or the second insulating member 142 form the protrusion 15, and the protrusion 15 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 limited by the protrusion 15, and the torsion resistance of the electrode terminal assembly can be improved. In addition, the first electrode terminal 131 and the second electrode terminal 141 can maintain a relatively safe distance, which can help to reduce the probability of accidental conduction.

[0159] In some embodiments, as shown in FIGS. 5-7 and 10-15, 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, which overlap and abut each other along the second direction Y.

[0160] As shown in FIGS. 12 and 14, the protrusion 15 can be configured on the first electrode terminal assembly 13, and the recess 16 corresponding to the protrusion 15 can be configured on the second electrode terminal assembly 14. The protrusion 15 can also be configured on the second electrode terminal assembly 14, and the recess 16 corresponding to the protrusion 15 can be configured on the first electrode terminal assembly 13. The protrusion 15 and the recess 16 can also be configured on the first electrode terminal assembly 13, respectively, and the recess 16 and the protrusion 15 corresponding to the protrusion 15 and the recess 16, respectively, can be configured on the second electrode terminal assembly 14.

[0161] The protrusion 15 is inserted into the recess 16, and the protrusion 15 and the recess 16 overlap and abut each other in the thickness direction Z perpendicular to the first housing wall 111.

[0162] In this way, the protrusion 15 and the recess 16 limit each other, and the first electrode terminal assembly 13 and the second electrode terminal assembly 14 are limited to each other in the thickness direction Z by the protrusion 15 and the recess 16, thereby improving the torsion resistance of the electrode terminal assemblies. Moreover, the cooperation of the protrusion 15 and the recess 16 facilitates the compact arrangement of the two electrode terminal assemblies.

[0163] In some embodiments, the protrusion 15 has a first cooperating surface, and the recess 16 has a second cooperating surface, and the projection of the first cooperating surface and the projection of the second cooperating surface at least partially overlap each other along the second direction Y, and the overlapping part of the projection of the first cooperating surface and the projection of the second cooperating surface abut each other.

[0164] In some specific embodiments, as shown in FIG. 8, the periphery of the first electrode terminal assembly 13 in the thickness direction Z has a surface, and the protrusion 15 and / or the recess 16 is configured on the surface of the first electrode terminal assembly 13 facing the second electrode terminal assembly 14. The periphery of the second electrode terminal assembly 14 in the thickness direction Z has a surface, and the protrusion 15 and / or the recess 16 is configured on the surface of the second electrode terminal assembly 14 facing the first electrode terminal assembly 13.

[0165] The protrusion 15 can be configured in a cylindrical shape, a prism shape, or the like, and the present disclosure does not make any special limitation on the specific shape of the protrusion 15. When the protrusion 15 is configured in a prism shape, the circumferential side of the protrusion 15 perpendicular to the thickness direction Z has a plurality of first engagement surfaces; when the protrusion 15 is configured in a cylindrical shape, the circumferential side of the protrusion 15 perpendicular to the thickness direction Z has one first engagement surface. The recess 16 is configured in a shape corresponding to the shape of the protrusion 15, so that the circumferential side of the recess 16 perpendicular to the thickness direction Z has one or more second engagement surfaces.

[0166] As shown in FIG. 8, in the second direction Y, the projection of the protrusion 15 and the projection of the recess 16 have an overlap. Specifically, in the second direction Y, the first engagement surface of the protrusion 15 and the second engagement surface of the recess 16 have an overlap, and at least part of the first engagement surface and at least part of the second engagement surface abut. Alternatively, the first engagement surface and the second engagement surface are configured in a shape capable of complete adhesion, so that the first engagement surface and the second engagement surface are completely adhered and abut.

[0167] Since the projections of the first engagement surface and the second engagement surface at least partially overlap in the second direction Y, and the overlapping parts of the projections of the first engagement surface and the second engagement surface abut each other, the first engagement surface and the second engagement surface are limited by each other, and the engagement surfaces are difficult to move in the state of abutting each other. Moreover, the engagement surfaces are less prone to stress concentration.

[0168] In some embodiments, the first engagement surface and the second engagement surface both extend along the thickness direction Z, or the first engagement surface and the second engagement surface both extend obliquely relative to the thickness direction Z.

[0169] The first engagement surface and the second engagement surface can both be configured to extend along the thickness direction Z, i.e., the first engagement surface and the second engagement surface are both perpendicular to the first shell wall 111. Alternatively, the first engagement surface and the second engagement surface can both be configured as inclined surfaces with the same angle of inclination, i.e., the first engagement surface and the second engagement surface both extend obliquely relative to the thickness direction Z.

[0170] Since the first engagement surface and the second engagement surface both extend along the thickness direction Z, the first engagement surface and the second engagement surface adhere to each other and limit the movement of each other in the second direction Y. Since the first engagement surface and the second engagement surface both extend obliquely relative to the thickness direction Z, the first engagement surface and the second engagement 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 bending deformation resistance of the electrode terminal assembly in multiple directions.

[0171] In some embodiments, as shown in FIGS. 11-14, the protrusion 15 further has a third mating surface, and the recess 16 further has a fourth mating surface, the third mating surface and the fourth mating surface abut each other and are both parallel to the first housing wall 111, along the thickness direction Z, a projection of the third mating surface partially coincides with a 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 two side surfaces of the protrusion 15 along the thickness direction Z of the first housing wall 111 can be regarded as the third mating surface. The recess 16 has the fourth mating surface. The two side surfaces of the recess 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 shown in FIG. 13, along the thickness direction Z of the first housing wall 111, the recess 16 is disposed between the protrusion 15 and the first housing wall 111. Specifically, the length of the protrusion 15 along the thickness direction Z is smaller than the length of other regions where no protrusion 15 is disposed, and the protrusion 15 is disposed away from the first housing wall 111, and the surface of the protrusion 15 close to the first housing wall 111 is regarded as the third mating surface. The recess 16 is open to the side away from the first housing wall 111, and the recess 16 has a stepped portion close to and abutting the first housing wall 111, and the surface of the stepped portion away from the first housing wall 111 is regarded as the fourth mating surface. The protrusion 15 is accommodated in the recess 16, the second mating surface of the recess 16 and the first mating surface of the protrusion 15 limit each other 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 limit each other in the thickness direction Z.

[0174] Since the third mating surface and the fourth mating surface abut each other and are both parallel to the first housing wall 111, and along the thickness direction Z, a projection of the third mating surface partially coincides with a 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 to 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 bending deformation resistance of the two electrode terminal assemblies in the thickness direction Z, and also helps to strengthen the bending deformation resistance of the region of the first housing wall 111 where the first electrode terminal assembly 13 and the second electrode terminal assembly 14 are disposed.

[0175] In some alternative embodiments, the protrusion 15 is disposed between the recess 16 and the first housing wall 111 along the thickness direction Z of the first housing wall 111. Specifically, the protrusion 15 has a length along the thickness direction Z smaller than that of other regions where no protrusion 15 is disposed, and the protrusion 15 is disposed close to the first housing wall 111, and the surface of the protrusion 15 away from the first housing wall 111 along the thickness direction Z is regarded as a third mating surface. The recess of the recess 16 is open toward the side of the first housing wall 111, and there is a gap between the recess bottom of the recess 16 and the first housing wall 111, and the surface of the recess 16 toward the first housing wall 111 is regarded as a fourth mating surface. The recess 16 is clamped on the protrusion 15 from the side away from the first housing wall 111 along the thickness direction Z, and the second mating surface of the recess 16 and the first mating surface of the protrusion 15 are 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 limited in the thickness direction Z.

[0176] In one alternative embodiment, the first electrode terminal assembly 13 includes the first electrode terminal 131 and the first insulating member 132 fixed to each other, and the second electrode terminal assembly 14 includes the second electrode terminal 141 and the second insulating member 142 fixed to each other, 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, at least one of the first electrode terminal 131 and the first insulating member 132 is formed with the protrusion 15, and at least one of the second electrode terminal 141 and the second insulating member 142 is formed with the recess 16. No insulating member is disposed between the first electrode terminal 131 and the second electrode terminal 141.

[0177] Alternatively, the protrusion 15 is formed on at least one of the first electrode terminal 131 and the second electrode terminal 141, the recess 16 is formed on the first electrode terminal 131 and / or the second electrode terminal 141 corresponding to the protrusion 15, and the protrusion 15 extends into the recess 16 to directly contact the first electrode terminal 131 and the second electrode terminal 141.

[0178] In some embodiments, as shown in FIGS. 5-7 and 10-15, the first electrode terminal assembly 13 includes the first electrode terminal 131 and the first insulating member 132 fixed to each other, the second electrode terminal assembly 14 includes the second electrode terminal 141 and the second insulating member 142 fixed to each other, at least one of the first electrode terminal 131 and the first insulating member 132 is formed with the protrusion 15, and at least one of the second electrode terminal 141 and the second insulating member 142 is formed with the recess 16, and at least a portion of the first insulating member 132 and / or at least a portion of the second insulating member 142 is disposed at least at the position where the protrusion 15 and the recess 16 abut each other.

[0179] The first electrode terminal assembly 13 includes a first electrode terminal 131 and a first insulating member 132. The first electrode terminal 131 is partially inserted through the first housing wall 111 to be electrically connected to the electrode assembly 12, and the first insulating member 132 is disposed 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.

[0180] Specifically, the first insulating member 132 can be disposed around a circumferential surface of the first electrode terminal 131 perpendicular to the thickness direction Z, can be attached to a surface of the first electrode terminal 131 close to the first housing wall 111, or can be configured in a box type with one side open, and the first electrode terminal 131 can be disposed in the box type first insulating member 132. Optionally, the first insulating member 132 and the first electrode terminal 131 can be bonded using an adhesive.

[0181] The second electrode terminal assembly 14 includes a second electrode terminal 141 and a second insulating member 142. The second electrode terminal 141 is partially inserted through the first housing wall 111 to be electrically connected to the electrode assembly 12, and the second insulating member 142 is disposed 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.

[0182] Specifically, the second insulating member 142 can be disposed around a circumferential surface of the second electrode terminal 141 perpendicular to the thickness direction Z, can be attached to a surface of the second electrode terminal 141 close to the first housing wall 111, or can be configured in a box type with one side open, and the second insulating member 142 can be disposed in the box type second insulating member 142. Optionally, the second insulating member 142 and the second electrode terminal 141 can be bonded using an adhesive.

[0183] In some embodiments, the first insulating member 132 and the second insulating member 142 are disposed between the first electrode terminal 131 and the second electrode terminal 141, at least a portion of the first insulating member 132 protrudes in a direction close to the second insulating member 142 to form a protrusion 15, and the second insulating member 142 is recessed in a direction close to the second electrode terminal 141 to form a recess 16 corresponding to the protrusion 15. The protrusion 15 is accommodated in the recess 16.

[0184] In some embodiments, only the first insulating member 132 is arranged between the first electrode terminal 131 and the second electrode terminal 141. At least a portion of the first insulating member 132 can be protruded to form a protrusion 15 towards the second insulating member 142, and the second insulating member 142 can be recessed to form a recess 16 towards the second electrode terminal 141 corresponding to the protrusion 15. Alternatively, a portion of the first electrode terminal 131 can be protruded to form a part of the protrusion 15 towards the second electrode terminal 141, and the first insulating member 132 can be arranged around the other part of the protrusion 15. The second electrode terminal 141 can be arranged with the recess 16 corresponding to the protrusion 15. The protrusion 15 is accommodated in the recess 16.

[0185] In some embodiments, only the second insulating member 142 is arranged between the first electrode terminal 131 and the second electrode terminal 141. At least a portion of the second insulating member 142 can be recessed to form a recess 16 towards the second electrode terminal 141, and the first electrode terminal 131 can be protruded to form a protrusion 15 towards the second electrode terminal 141 corresponding to the recess 16. Alternatively, a portion of the second electrode terminal 141 can be recessed to form a part of the recess 16 on a side of the second electrode terminal 141 close to the second insulating member 142, and the second insulating member 142 can be arranged to fit the other part of the recess 16. The protrusion 15 is accommodated in the recess 16 and abuts against the second insulating member 142 forming the recess 16.

[0186] In this way, the protrusion 15 extends into the recess 16 and abuts against the recess 16, and the first electrode terminal assembly 13 and the second electrode terminal assembly 14 are cooperated by the protrusion 15 and the recess 16 to limit each other at least in the second direction Y, thereby improving the anti-twisting capability of the two assemblies. Moreover, by arranging the insulating member between the protrusion 15 and the recess 16, the first electrode terminal 131 and the second electrode terminal 141 are kept insulated, which helps to reduce the probability of accidental conduction.

[0187] In some embodiments, as shown in FIGS. 14 and 15, the protrusion 15 includes a first protrusion 151 formed on the first electrode terminal 131 and a second protrusion 153 formed on the first insulating member 132; the recess 16 is formed on at least one of the second insulating member 142 and the second electrode terminal 141; along the second direction Y, the first protrusion 151 and the second protrusion 153 both overlap and abut against the recess 16, and the first protrusion 151 and the recess 16 are separated by a portion of the first insulating member 132.

[0188] In one specific embodiment, a portion of the first electrode terminal 131 is protruded towards the second electrode terminal 141 to form a first protrusion 151, and the first insulating member 132 is arranged around the first protrusion 151 to form a second protrusion 153. The second electrode terminal 141 is arranged with a recess 16. The first protrusion 151 and the second protrusion 153 are at least partially accommodated in the recess 16, and the second protrusion 153 protruded by the first insulating member 132 is located between the first protrusion 151 and the recess 16.

[0189] Optionally, the first electrode terminal 131 with the first protrusion 151 is formed by a terminal plate which forms an integral piece. The first insulating member 132 with the second protrusion 153 can be injection molded and also forms an integral piece. Similarly, the second electrode terminal 141 and the second insulating member 142 are respectively formed as integral pieces.

[0190] Since the protrusion 15 includes the first protrusion 151 and the second protrusion 153 and both of them overlap and abut with the recess 16, the strength of the abutting position can be improved, and the ability of the overall torsional moment of the two electrode terminal assemblies can be improved. Moreover, since the first protrusion 151 is always separated from the recess 16 by the first insulating member 132, the insulation reliability between the first electrode terminal 131 and the second electrode terminal 141 can be improved.

[0191] In some embodiments, referring to FIG. 14 and FIG. 15, the protrusion 15 is formed on the first electrode terminal 131, the recess 16 includes a first recess 163 formed on the second electrode terminal 141 and a second recess 164 formed on the second insulating member 142, along the second direction Y, the protrusion 15 overlaps and abuts with the first recess 163 and the second recess 164, and the protrusion 15 is separated from the first recess 163 by a portion of the second insulating member 142.

[0192] In one specific embodiment, a recess is formed on the side of the second electrode terminal 141 close to the second insulating member 142 to form the first recess 163, and a portion of the second insulating member 142 is arranged to fit the first recess 163 to form the second recess 164. The protrusion 15 is accommodated in the second recess 164 and presses the second insulating member 142 tightly into the first recess 163.

[0193] Optionally, the second electrode terminal 141 with the first recess 163 is formed by a terminal plate which forms an integral piece. The second insulating member 142 with the second recess 164 can be injection molded and also forms an integral piece. The first electrode terminal 131 and the first insulating member 132 are respectively formed as integral pieces.

[0194] Since the recessed portion 16 includes a first recessed portion 163 and a second recessed portion 164, and the protrusion 15 overlaps and abuts with both the first recessed portion 163 and the second recessed portion 164, the strength of the abutment position can be improved, thereby enhancing the overall torsional torque resistance of the two electrode terminal assembly. Furthermore, since the protrusion 15 and the first recessed portion 163 are always separated by a second insulating member 142, the insulation reliability between the first electrode terminal 131 and the second electrode terminal 141 can be improved.

[0195] In some embodiments, as shown in Figures 11 and 12, the recess 16 includes a first step portion 161 and a second step portion 162, the second step portion 162 being disposed on the side of the first step portion 161 away from the first electrode terminal assembly 13; along the thickness direction Z, a portion of the first step portion 161 is located between the protrusion 15 and the first housing wall 111, the protrusion 15 being at least partially accommodated in the step space formed by the first step portion 161, and the first insulating member 132 further includes a cover portion 152, the cover portion 152 being connected to the second protrusion 153 and at least partially accommodated in the step space formed by the second step portion 162.

[0196] Here, the recessed portion 16 includes a first stepped portion 161 and a second stepped portion 162.

[0197] The first stepped portion 161 is formed by the portion of the second electrode terminal 141 that decreases in the thickness direction Z towards the side opposite to the first housing wall 111, as shown in the dashed box on the left side of the second electrode terminal 141 in FIG12. The first protrusion 151 is accommodated in the first stepped portion 161, and the insulating member is located between the first protrusion 151 and the first stepped portion 161.

[0198] The first step portion 161 is formed on the side surface of the second electrode terminal 141 facing away from the first housing wall 111 along the thickness direction Z. The first protrusion 151 is accommodated in the first step portion 161, and the first insulating member 132 is located between the first protrusion 151 and the first step portion 161.

[0199] The first insulating member 132 also has a portion that covers the surface of the first protrusion 151 that contacts the recess 16, so that when the first protrusion 151 is inserted into the first step 161, the first insulating member 132 is held between the first protrusion 151 and the first step 161, thereby maintaining an insulating state.

[0200] As shown in Figures 11 and 12, a second step portion 162 is further formed on the second electrode terminal 141 at a position further away from the first protrusion 151 than the first step portion 161. The first insulating member 132 has a covering portion 152, which covers the second step portion 162 from the side away from the first housing wall 111 along the thickness direction Z of the first housing wall 111.

[0201] The second step portion 162 can be a portion lowered along the thickness direction Z of the first housing wall 111 with respect to a surface of the second electrode terminal 141 farthest from the first housing wall 111; and the covering portion 152 can be a portion of the first insulating member 132. Along the thickness direction Z of the first housing wall 111, the covering portion 152 can be partially or entirely recessed in the second step portion 162.

[0202] The length of the second step portion 162 and the covering portion 152 along the first direction X can be determined according to the creepage distance to be provided. Generally, the longer the length of the second step portion 162 and the covering portion 152 along the first direction X, the greater the creepage distance and the higher the insulation reliability.

[0203] Thus, the cooperation of the protruding portion 15 and the first step portion 161 can limit the bending deformation (especially the complete deformation toward the direction away from the first housing wall 111) of the second electrode terminal assembly 14, and further accommodate the protruding portion 15 at least partially in the first step portion 161 to reduce the space occupied by the protruding portion 15 and improve the space utilization. By providing the covering portion 152, the creepage distance on the surface of the first electrode terminal 131 and the second electrode terminal 141 can be increased, and the insulation reliability can be improved. Moreover, by accommodating the covering portion 152 in the second step portion 162, the covering portion 152 does not occupy additional space, thereby improving the space utilization.

[0204] In some embodiments, as shown in FIG. 12, the recessed portion 16 includes the first step portion 161 and the second step portion 162, the second step portion 162 is disposed on the side of the first step portion 161 away from the first electrode terminal assembly 13; along the thickness direction Z, a portion of the first step portion 161 is located between the protruding portion 15 and the first housing wall 111, the protruding portion 15 is at least partially accommodated in the step space formed by the first step portion 161, and the second insulating member 142 further includes the covering portion 152, the covering portion 152 is connected with the second recessed portion 164 and at least partially accommodated in the step space formed by the second step portion 162.

[0205] The covering portion 152 can be a portion of the second insulating member 142. Along the thickness direction Z of the first housing wall 111, the covering portion 152 can be partially or entirely recessed in the second step portion 162.

[0206] In one specific embodiment, the portion of the second insulating member 142 is located between the protrusion 15 and the first step portion 161 and is accommodated in the step space of the first step portion 161. The second insulating member 142 covers the protrusion 15 and extends toward the second step portion 162 to form the covering portion 152, i.e., the covering portion 152 covers the second step portion 162 from the side away from the first housing wall 111 in the thickness direction Z of the first housing wall 111.

[0207] The length of the second step 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 length of the second step portion 162 and the covering portion 152 in the first direction X, the greater the creepage distance and the higher the insulation reliability.

[0208] Thus, the cooperation of the protrusion 15 and the first step portion 161 can limit the bending deformation (especially the complete deformation toward the direction away from the first housing wall 111) of the second electrode terminal assembly 14, and further accommodate the protrusion 15 at least partially in the first step portion 161 to reduce the space occupied by the protrusion 15 and improve the space utilization. By providing the covering portion 152, the creepage distance on the surface of the first electrode terminal 131 and the second electrode terminal 141 can be increased, and the insulation reliability can be improved. Moreover, by accommodating the covering portion 152 in the second step portion 162, the covering portion 152 does not occupy additional space, thereby improving the space utilization.

[0209] In some embodiments, as shown in FIG. 12, the portion of the protrusion 15 overlapping with the recess 16 in the thickness direction Z is an overlapping region, and the length of the overlapping region in the first direction X is L11, which is in the range of 0.5 mm to 6 mm.

[0210] For example, the length L11 of the overlapping region in the first direction X can be 0.5 mm, 1 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, or 6 mm. Of course, it can also be other values in the range of 0.5 mm to 6 mm.

[0211] Thus, by setting the length of the overlapping region in the first direction X to be small, the cooperation strength between the protrusion 15 and the recess 16 can be improved, and the space utilization can be improved.

[0212] In some embodiments, the electrode assembly 12 includes first and second polar plates having opposite polarities, the first electrode terminal 131 is electrically connected to the first polar plate, and the second electrode terminal 141 is electrically connected to the second polar plate.

[0213] The electrode assembly 12 includes first and second polar tabs of opposite polarity. The first and second polar tabs are led out by a tab and are connected to the electrode terminal directly or indirectly. As an example, the tab includes a positive tab 121 and a negative tab 122. The first polar tab leads out the positive tab 121, and the second polar tab leads out the negative tab 122.

[0214] A portion of the first electrode terminal 131 is electrically connected to the positive tab 121 or the negative tab 122 through the first case wall 111, and a portion of the second electrode terminal 141 is electrically connected to the positive tab 121 or the negative tab 122 through the first case wall 111.

[0215] Thus, the electrode terminal of opposite polarity can be provided on the first case wall 111 of the battery cell 10, which is advantageous in reducing the space occupied by the busbar 17 and the like, and is also advantageous in providing other structural members such as the heat exchange member on the other case walls of the battery cell 10, which is advantageous in improving the volume utilization of the battery.

[0216] In some embodiments, the first insulating member 132 is partially provided between the first electrode terminal 131 and the first case wall 111, and the second insulating member 142 is partially provided between the second electrode terminal 141 and the first case wall 111.

[0217] Thus, the first electrode terminal 131 and the second electrode terminal 141 can be insulated from the first case wall 111.

[0218] In some embodiments, as shown in FIGS. 13 and 14, the first recess 1111 and the second recess 1112 are formed in the first case wall 111, the first recess 1111 and the second recess 1112 are located on the side of the first case wall 111 away from the accommodation space 11a in 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.

[0219] The first recess 1111 and the second recess 1112 are recessed regions formed by thinning the thickness of the first case wall 111 in the thickness direction Z of the first case wall 111, and the plan view shape (shape observed in the thickness direction Z of the first case wall 111) thereof can be configured to be capable of accommodating at least a portion of the first insulating member 132 and at least a portion of the second insulating member 142. The recessed depth of the recessed region can be substantially the same as or slightly lower than the height (dimension in the thickness direction Z of the first case wall 111) of the first insulating member 132 or the second insulating member 142.

[0220] One or two or more first recesses 1111 and / or second recesses 1112 can be formed on the first case wall 111.

[0221] Corresponding to the recessed regions, portions of the first insulating member 132 located in the first recessed portion 1111 and portions of the second insulating member 142 located in the second recessed portion 1112 are formed with protrusions, respectively, which can be fitted into the first recessed portion 1111 and the second recessed portion 1112, respectively, so as to limit 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 (a direction perpendicular to the thickness direction Z of the first housing wall 111).

[0222] In some embodiments, the first recessed portion 1111 and the second recessed portion 1112 form the same recessed portion.

[0223] In this way, the installation strength of the insulating member relative to the first housing wall 111 can be improved, and the possibility of displacement of the insulating member along the surface of the first housing wall 111 can be reduced. In addition, the positioning of the insulating member and the first housing wall 111 relative to each other during assembly is facilitated.

[0224] In some embodiments, as shown in FIG. 13, the recessed depth of the first recessed portion 1111 along the thickness direction Z is H1, and the wall thickness of the portion of the first housing wall 111 located around the first recessed portion 1111 along the thickness direction Z is H, and H1 is within the range of 30% to 70% of H.

[0225] The recessed depth H1 of the first recessed portion 1111 along the thickness direction Z can be within the range of 30% to 70% of the wall thickness H of the portion of the first housing wall 111 located around the first recessed portion 1111 along the thickness direction Z, i.e., H1 / H is within the range of 30% to 70%. For example, H1 / H can be 30%, 36%, 45%, 53%, 59%, 66%, or 70%. Of course, other values within the above range can also be used.

[0226] In this way, the first recessed portion 1111 accommodates part of the insulating member, which not only reduces the space occupied by the electrode terminal assembly, but also reduces the impact of the recessed portion on the strength of the first housing wall 111.

[0227] In some embodiments, as shown in FIGS. 9, 10, and 16, the first electrode terminal 131 includes a first main body portion 1311 and a first extension portion 1312 connected to each other, and the second electrode terminal 141 includes a second main body portion 1411 and a second extension portion 1412 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 in a partially overlapping manner along the second direction Y.

[0228] The first electrode terminal assembly 13 includes a first electrode terminal 131 including a first body portion 1311 and a first extension portion 1312. In FIG. 9, the portion of the first electrode terminal 131 to the left of the left-hand dotted line serves as the first body portion 1311, and the remaining portion of the first electrode terminal 131 (excluding the first protruding portion 151) serves as the first extension portion 1312. Similarly, the second electrode terminal assembly 14 includes a second electrode terminal 141 including a second body portion 1411 and a second extension portion 1412. Here, the portion of the second electrode terminal 141 to the right of the right-hand dotted line serves as the second body portion 1411, and the remaining portion of the second electrode terminal 141 serves as the second extension portion 1412.

[0229] In the specific example shown in FIG. 9, the first body portion 1311 and the second body portion 1411 are formed in a substantially rectangular shape with the long sides extending in the second direction Y, and the first body portion 1311 and the second body portion 1411 are arranged in the first direction X. The first extension portion 1312 and the second extension portion 1412 are each formed in a substantially rectangular shape with the long sides extending in the first direction X, and the first extension portion 1312 and the second extension portion 1412 are arranged in the second direction Y in a partially overlapping manner. Thus, in the first direction X, the first extension portion 1312 and the second extension portion 1412 are positioned between the first body portion 1311 and the second body portion 1411.

[0230] Of course, the shapes and arrangement positions of the first body portion 1311, the first extension portion 1312, the second body portion 1411, and the second extension portion 1412 are not limited to those of the example shown in FIG. 9.

[0231] In the specific example shown in FIG. 9, in the second direction Y, the second body portion 1411 is substantially flush with the outer edge (the edge close to the long side of the first housing wall 111) of the first extension portion 1312, and the first body portion 1311 is substantially flush with the outer edge (the edge close to the long side of the first housing wall 111) of the second extension portion 1412. However, it is also possible that they are not flush. Alternatively, one of the outer edges of the second body portion 1411 and the first extension portion 1312 is closer to the long side of the first housing wall 111, and / or one of the outer edges of the first body portion 1311 and the second extension portion 1412 is closer to the long side of the first housing wall 111.

[0232] Thus, the electrode terminal can be designed to have the main body part and the extension part, which is conducive to increasing the heat dissipation area of the electrode terminal while stably connecting the electrode terminal relative to the first shell wall 111, and is conducive to increasing the connection area and connection reliability of the electrode terminal and the busbar 17. In addition, since the first extension part 1312 and the second extension part 1412 are located between the first main body part 1311 and the second main body part 1411 along the first direction X, the bending strength of the region of the first shell wall 111 where the electrode terminal is arranged can be enhanced through the cooperation of the two terminal plates.

[0233] In some embodiments, as shown in FIGS. 11-14, the first electrode terminal assembly 13 further includes a first terminal plate 1313 connected with the first electrode terminal 131, at least part of the first terminal plate 1313 being arranged on the side of the first shell wall 111 facing the accommodation space 11a, the second electrode terminal assembly 14 further includes a second terminal plate 1413 connected with the second electrode terminal 141, at least part of the second terminal plate 1413 being arranged on the side of the first shell wall 111 facing the accommodation space 11a, the first main body part 1311 and the first terminal plate 1313 are directly connected through a first connecting column 1314; the second main body part 1411 and the second terminal plate 1413 are directly connected through a second connecting column 1414.

[0234] The first electrode terminal assembly 13 further includes a first terminal plate 1313. Any one of the first main body part 1311 and the first extension part 1312 is electrically connected with the first terminal plate 1313, the first main body part 1311 and the first extension part 1312 are located on the side of the first shell wall 111 away from the accommodation space 11a, and the first terminal plate 1313 is located on the side of the first shell wall 111 facing the accommodation space 11a. Optionally, any one of the first main body part 1311 and the first extension part 1312 is fixed with the first shell wall 111 through the first connecting column 1314 or the like together with the first terminal plate 1313.

[0235] The second electrode terminal assembly 14 further includes a second terminal plate 1413. Any one of the second main body part 1411 and the second extension part 1412 is electrically connected with the second terminal plate 1413, the second main body part 1411 and the second extension part 1412 are located on the side of the first shell wall 111 away from the accommodation space 11a, and the second terminal plate 1413 is located on the side of the first shell wall 111 facing the accommodation space 11a. Optionally, any one of the second main body part 1411 and the second extension part 1412 is fixed with the first shell wall 111 through the second connecting column 1414 or the like together with the second terminal plate 1413.

[0236] The first main body part 1311, the first extension part 1312, the second main body part 1411, and the second extension part 1412 are located outside the shell 11 of the battery monomer 10, and can be used to connect with the busbar 17 and the like; the first terminal plate 1313 and the second terminal plate 1413 are located inside the shell 11 of the battery monomer 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, and the like.

[0237] Optionally, the first main body part 1311 and the first extension part 1312 are regarded as a whole, the second main body part 1411 and the second extension part 1412 are regarded 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, L-shaped as shown in FIG. 9, and the like.

[0238] 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 through a part of the insulating member, which is 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.

[0239] Since the electrode terminal and the terminal plate can be connected together through the connecting column, the electrode terminal can play the role of leading current from the electrode assembly 12 as a whole. Moreover, the connecting column is provided on the main body part, so that the electrode terminal can be reliably fixed to the first shell wall 111 at the main body part.

[0240] In some embodiments, as shown in FIGS. 9, 10 and 16, the protruding part 15 is provided on the side of the first main body part 1311 close to the second extension part 1412, the recessed part 16 is provided on the side of the second extension part 1412 close to the first main body part 1311, and / or the protruding part 15 is provided on the side of the first extension part 1312 close to the second main body part 1411, the recessed part 16 is provided on the side of the second main body part 1411 close to the first extension part 1312, and / or the protruding part 15 is provided on the side of the first extension part 1312 close to the second extension part 1412, and the recessed part 16 is provided on the side of the second extension part 1412 close to the first extension part 1312.

[0241] The positions where the matching structure of the protruding part 15 and the recessed part 16 is provided can be between the first main body part 1311 and the second extension part 1412, between the second main body part 1411 and the first extension part 1312, and between the first extension part 1312 and the second extension part 1412. The matching structure of the protruding part 15 and the recessed part 16 can be provided at least one of these positions.

[0242] When the cooperating structure of the protrusion 15 and the recess 16 is provided between the first body portion 1311 and the second extension portion 1412, the first body portion 1311 protrudes toward the second extension portion 1412 at a position close to the second extension portion 1412, the second extension portion 1412 forms a recess corresponding to the protruding position, and the first insulating member 132 and / or the second insulating member 142 is / are provided between the protrusion and the recess.

[0243] When the cooperating structure of the protrusion 15 and the recess 16 is provided between the second body portion 1411 and the first extension portion 1312, the first extension portion 1312 protrudes toward the second body portion 1411 at a position close to the second body portion 1411, the second body portion 1411 forms a recess corresponding to the protruding position, and the first insulating member 132 and / or the second insulating member 142 is / are provided between the protrusion and the recess.

[0244] When the cooperating structure of the protrusion 15 and the recess 16 is provided between the first extension portion 1312 and the second extension portion 1412, the first extension portion 1312 protrudes toward the second extension portion 1412 at a position close to the second extension portion 1412, the second extension portion 1412 forms a recess corresponding to the protruding position, and the first insulating member 132 and / or the second insulating member 142 is / are provided between the protrusion and the recess.

[0245] Since the recess 16 provided on the second extension portion 1412 can be abutted by the protrusion 15 provided on the first 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 body portion 1411, the torsional moment is effectively resisted, and the risk of breakage of the extension portion due to the extension portion being formed relatively long is reduced.

[0246] In some embodiments, as shown in FIG. 16, the length of the protrusion 15 along the second direction Y is W11, and the length of the first housing wall 111 along the second direction Y is W, W11 is in the range of 10% to 90% of W.

[0247] W11 represents the length of the protrusion 15 along the second direction Y, and W represents the length of the first housing wall 111 along the second direction Y.

[0248] The length W11 of the protrusion 15 along the second direction Y can account for 10% to 90% of the length W of the first housing wall 111 along 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%, and of course other values in the above range.

[0249] Thus, the first housing wall 111 can be fully utilized in the second direction Y, and the support force between the first electrode terminal assembly 13 and the second electrode terminal assembly 14 can be reliably improved, the bending strength of the electrode terminal can be improved, and the strength of the first housing wall 111 around the electrode terminal can be enhanced.

[0250] In some embodiments, W11 is in the range of 5 mm to 50 mm.

[0251] For example, 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, or 50 mm. Of course, it can also be other values in the range of 5 mm to 50 mm.

[0252] 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, and by setting the size of the overlapping region in the second direction Y to be larger, the support force between the first electrode terminal assembly 13 and the second electrode terminal 141 can be improved, the bending strength of the electrode terminal can be improved, and the strength of the first housing wall 111 around the electrode terminal can be enhanced.

[0253] In a second aspect, as shown in FIGS. 2 and 18, the present disclosure also provides a battery device 100, which includes a box 20 and at least two battery cells 10 as described in the first aspect above.

[0254] Thus, a battery with a strengthened electrode terminal assembly in the battery cell 10 can be provided, which helps to improve the use reliability of the battery.

[0255] In some embodiments, as shown in FIG. 17, the first electrode terminal assembly 13 includes a first electrode terminal 131 including a first body portion 1311 and a first extension portion 1312 connected to each other, the second electrode terminal assembly 14 includes a second electrode terminal 141 including a second body portion 1411 and a second extension portion 1412 connected to each other, at least part of the first extension portion 1312 and at least part of the second extension portion 1412 are located between the first body portion 1311 and the second body portion 1411 along a first direction X, and the first extension portion 1312 and the second extension portion 1412 are arranged in a partially overlapping manner along a second direction Y, wherein the first direction X and the second direction Y are both perpendicular to a 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 in 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 electrically connected by the busbar 17.

[0256] Since the busbar 17 is connected to the first extension part 1312 and the second extension part 1412, the first extension part 1312 and the second extension part 1412 are located between the first body part 1311 and the second body part 1411, the bending resistance of the connection part is strong, thus the first electrode terminal 131, the second electrode terminal 141 and the first shell wall 111 are not easy to be bent and deformed or broken, thereby improving the use reliability of the battery.

[0257] In some embodiments, as shown in FIG. 18, at least one box wall of the box body 20 has a boss 201 formed by bulging the box wall in a direction away from the battery monomer 10, the boss 201 forms a containing part on the side facing the battery monomer 10, in the same projection plane along the direction perpendicular to the box wall where the boss 201 is formed, the projection of the first electrode terminal assembly 13 and the second electrode terminal assembly 14 does not exceed the projection of the boss 201, and the first electrode terminal assembly 13 and / or the second electrode terminal assembly 14 is at least partially contained in the containing part.

[0258] Thus, the height of the box body 20 at the position where the first electrode terminal assembly 13, the second electrode terminal 141 and the busbar 17 are located can be improved, thereby reducing the size of the battery and also facilitating the improvement of the volume utilization rate of the battery.

[0259] In a third aspect, the embodiments of the present disclosure also provide a power utilization device, which comprises the battery monomer 10 as described in the first aspect above or the battery device 100 as described in the second aspect above, and the battery monomer 10 or the battery device 100 is used to store or provide electric energy.

[0260] Thus, the power utilization device with the battery device 100 carrying the battery monomer 10 whose electrode terminal is not easy to be twisted or has a small degree of twist can be provided, the use reliability of the power utilization device is improved, and the maintenance time of the power utilization device is also reduced.

[0261] In a fourth aspect, the embodiments of the present disclosure also provide an energy storage device, which comprises the battery monomer 10 as described in the first aspect above or the battery device 100 as described in the second aspect above, and the battery monomer 10 or the battery device 100 is used to store or provide electric energy.

[0262] Thus, the energy storage device with the battery device 100 carrying the battery monomer 10 whose electrode terminal is not easy to be twisted or has a small degree of twist can be provided, the use reliability of the energy storage device is improved, and the maintenance time of the energy storage device is also reduced.

[0263] A specific embodiment of the present disclosure will be described below.

[0264] When the electrode terminal is subjected to a force perpendicular to the thickness direction Z, it can be twisted, and when it is subjected to a force in the thickness direction Z, it can be deformed, causing the electrode terminal to fail.

[0265] For the force in the thickness direction Z, a riveting structure of a protrusion 15 and a recess 16 can be formed between the two electrode terminal assemblies, which are clamped to each other to limit the force in the thickness direction Z and improve the 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, which limits the electrode terminal assembly in the thickness direction Z. In order to improve the compactness of the structure, 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 placed in the groove.

[0266] 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 arranged to overlap each other in the thickness direction Z, so that they can support each other and improve the strength of the force in the thickness direction Z.

[0267] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art can make various modifications and changes to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A battery cell comprising: a case having an accommodation space, the case including a first case wall; an electrode assembly at least partially disposed in the accommodation space; a first electrode terminal assembly and a second electrode terminal assembly disposed in the first case wall, a portion of the first electrode terminal assembly and a portion of the second electrode terminal assembly overlap and abut each other in a direction perpendicular to a thickness direction of the first case wall.

2. The battery cell according to claim 1, wherein the first electrode terminal assembly includes first electrode terminals, and the second electrode terminal assembly includes second electrode terminals, the first electrode terminals and the second electrode terminals are arranged in a first direction; a portion of the first electrode terminal assembly and a portion of the second electrode terminal assembly overlap and abut each other in a second direction, wherein the first direction and the second direction are both perpendicular to the thickness direction of the first case 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 protrusion, the protrusion of the first electrode terminal assembly and the second electrode terminal assembly abut each other in the second direction, and / or the protrusion of the second electrode terminal assembly and the first electrode terminal assembly abut each other.

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

5. The battery cell according to claim 3 or 4, wherein one of the first electrode terminal assembly and the second electrode terminal assembly has the protrusion, and the other has a recess, the protrusion and the recess overlap and abut each other in the second direction.

6. The battery cell according to claim 5, wherein the protrusion has a first mating surface, and the recess has a second mating surface, a projection of the first mating surface and a projection of the second mating surface at least partially coincide in the second direction, and the projections of the first mating surface and the second mating surface coincide with each other.

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

8. The battery cell according to claim 6 or 7, wherein the protrusion further has a third mating surface, and the recess further has a fourth mating surface, the third mating surface and the fourth mating surface abut each other and are both parallel to the first case wall, a projection of the third mating surface and a projection of the fourth mating surface partially coincide in the thickness direction, and the fourth mating surface is located between the third mating surface and the first case wall.

9. The battery cell according to any one of claims 5 to 8, wherein the first electrode terminal assembly includes a first electrode terminal and a first insulator fixed to each other, and the second electrode terminal assembly includes a second electrode terminal and a second insulator fixed to each other, at least one of the first electrode terminal and the first insulator is formed with the protrusion, at least one of the second electrode terminal and the second insulator is formed with the recess, and a portion of the first insulator and / or a portion of the second insulator is provided at least at a position where the protrusion and the recess abut each other.

10. The battery cell according to claim 9, wherein the protrusion includes a first protrusion formed in the first electrode terminal and a second protrusion formed in the first insulator; the recess is formed in at least one of the second insulator and the second electrode terminal; along the second direction, the first protrusion, the second protrusion, and the recess overlap and abut each other, and the first protrusion and the recess are separated by a portion of the first insulator.

11. The battery cell according to claim 9, wherein the protrusion is formed in the first electrode terminal, the recess includes a first recess formed in the second electrode terminal and a second recess formed in the second insulator, along the second direction, the protrusion, the first recess, and the second recess overlap and abut each other, and the protrusion and the first recess are separated by a portion of the second insulator.

12. The battery cell of claim 10, wherein, the recess includes a first step portion and a second step portion, the second step portion being provided on a side of the first step portion away from the first electrode terminal assembly; along the thickness direction, a portion of the first step portion is located between the protrusion and the first housing wall, and the protrusion is at least partially accommodated in a step space formed by the first step portion, the first insulator further includes a cover portion connected to the second protrusion and at least partially accommodated in a step space formed by the second step portion.

13. The battery cell according to claim 11, wherein the recess includes a first step portion and a second step portion, the second step portion being provided on a side of the first step portion away from the first electrode terminal assembly; along the thickness direction, a portion of the first step portion is located between the protrusion and the first housing wall, and the protrusion is at least partially accommodated in a step space formed by the first step portion, the second insulator further includes a cover portion connected to the second recess and at least partially accommodated in a step space formed by the second step portion.

14. The battery cell according to claim 12 or 13, wherein along the thickness direction, a portion where the protrusion and the recess overlap each other is an overlapping region, a length of the overlapping region along the first direction is L11, and L11 is in a range of 0.5 mm to 6 mm.

15. The battery cell according to any one of claims 9 to 14, wherein The electrode assembly includes first and second polar plates of opposite polarity, the first electrode terminal electrically connecting the first polar plate, and the second electrode terminal electrically connecting the second polar plate.

16. The battery cell according to claim 15, wherein The first insulator portion is disposed between the first electrode terminal and the first case wall, The second insulator portion is disposed between the second electrode terminal and the first case wall.

17. The battery cell according to claim 16, wherein A first recess and a second recess are formed in the first case wall, the first recess and the second recess being on a side of the first case wall facing away from the accommodation space in the thickness direction, At least a portion of the first insulator is located in the first recess, and at least a portion of the second insulator is located in the second recess.

18. The battery cell according to claim 17, wherein The first recess has a recess depth of H1 in the thickness direction, and a portion of the first case wall around the first recess has a wall thickness of H in the thickness direction, H1 is in a range of 30% to 70% of H.

19. The battery cell according to any one of claims 2 to 18, wherein 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, In 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 main body portion and the second main body portion, and the first extension portion and the second extension portion are arranged in a partially overlapping manner in the second direction.

20. The battery cell according to claim 19, wherein The first electrode terminal assembly further includes a first terminal plate connected to the first electrode terminal, at least a portion of the first terminal plate being disposed on a side of the first case wall facing the accommodation space, The second electrode terminal assembly further includes a second terminal plate connected to the second electrode terminal, at least a portion of the second terminal plate being disposed on a side of the first case wall facing the accommodation space, The first main body portion and the first terminal plate are directly connected by a first connecting column, The second main body portion and the second terminal plate are directly connected by a second connecting column.

21. The battery cell according to claim 20, wherein The protruding portion is disposed on a side of the first main body portion close to the second extension portion, the recessed portion is disposed on a side of the second extension 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, 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 extension portion close to the second extension portion, and the recessed portion is disposed on a side of the second extension portion close to the first extension portion.

22. The battery cell according to any one of claims 3 to 21, wherein The length of the protrusion in the second direction is W11, and the length of the first housing wall in the second direction is W, W11 is in the range of 10% to 90% of W.

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

24. A battery device comprising a case and at least two battery cells according to any one of claims 1 to 23.

25. The battery device according to claim 24, wherein the first electrode terminal assembly includes a first electrode terminal including a first body portion and a first extension portion connected to each other, the second electrode terminal assembly includes a second electrode terminal including a second body portion and a second extension portion connected to each other, 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 in a first direction, and the first extension portion and the second extension portion are partially overlapped and spaced apart in a second direction, wherein the first direction and the second direction are each perpendicular to a thickness direction of the first housing wall, and the first direction and the second direction are perpendicular to each other, each of the battery cells is arranged in the second direction, and, in adjacent battery cells, the first extension portion of one of the battery cells and the second extension portion of the other of the battery cells are arranged in the second direction and electrically connected by a bus member.

26. The battery device according to claim 25, wherein at least one case wall of the case has a boss formed by bulging of the case wall toward a direction away from the battery cells, the boss forms a receiving portion on a side toward the battery cells, in the same projection plane in a direction perpendicular to the case wall in which the boss is formed, projections of the first electrode terminal assembly and the second electrode terminal assembly do not exceed a projection of the boss, and the first electrode terminal assembly and / or the second electrode terminal assembly is at least partially received in the receiving portion.

27. A power consuming device comprising 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, the battery cells or the battery device being used to store or supply electric power.

28. An energy storage device comprising 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, the battery cells or the battery device being used to store or supply electric power.

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