Battery monomer, battery and electric equipment

Abstract

The utility model provides a battery monomer, a battery and electric equipment. The battery cell includes a housing having a wall portion, an electrode assembly disposed within the housing, and a first electrode terminal disposed on the wall portion. The first electrode terminal includes a first terminal portion and a second terminal portion, the first terminal portion and the second terminal portion are made of different materials, and the first terminal portion and the second terminal portion are stacked in the thickness direction of the wall portion. Wherein the first terminal part is provided with a connecting part, the second terminal part is provided with a hole part, and the connecting part is at least partially arranged in the hole part and is fixedly connected with the second terminal part. The first terminal part is provided with a connecting part, the second terminal part is provided with a hole part, and the connecting part is at least partially arranged in the hole part and is fixedly connected with the second terminal part, so that the first terminal part and the second terminal part have relatively high connecting strength, the risk that the first terminal part is separated from the second terminal part is reduced, and the improvement of the reliability of the battery monomer is facilitated.

Description

Technical Field

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

[0002] Batteries are widely used in the new energy field, such as electric vehicles, new energy vehicles, etc. Electric vehicles and new energy vehicles have become new trends in the development of the automotive industry. The development of battery technology needs to consider various design factors at the same time. For example, performance parameters such as battery life, energy density, discharge capacity, charge and discharge rate, etc. In addition, the reliability of the battery also needs to be considered. However, the current batteries have poor reliability. Summary of the Utility Model

[0003] The purpose of the embodiments of the present application is to provide a battery cell, a battery and an electrical device, which aims to improve the problem of poor reliability of the battery in the related art.

[0004] In a first aspect, the embodiments of the present application provide a battery cell, the battery cell includes a housing, an electrode assembly and a first electrode terminal, the housing has a wall portion; the electrode assembly is disposed inside the housing; the first electrode terminal is disposed on the wall portion, the first electrode terminal includes a first terminal portion and a second terminal portion, the material of the first terminal portion is different from that of the second terminal portion, and the first terminal portion and the second terminal portion are stacked along the thickness direction of the wall portion; wherein, a connection portion is provided on the first terminal portion, a hole portion is provided on the second terminal portion, at least part of the connection portion is disposed in the hole portion and is fixedly connected to the second terminal portion.

[0005] In the above technical solution, the materials of the first terminal portion and the second terminal portion of the first electrode terminal are different, so that it is convenient for one of the first terminal portion and the second terminal portion to be welded to the first electrode lead-out portion, and the other of the first terminal portion and the second terminal portion to be welded to the bus bar component. In addition, a connection portion is further provided on the first terminal portion, a hole portion is provided on the second terminal portion, at least part of the connection portion is disposed in the hole portion and is fixedly connected to the second terminal portion, so that the first terminal portion and the second terminal portion have a high connection strength, reducing the risk of separation between the first terminal portion and the second terminal portion, which is beneficial to improving the reliability of the battery cell.

[0006] As an optional technical solution of the embodiments of the present application, the connection portion includes a connection body and a limiting body, at least part of the connection body is received in the hole portion, along the thickness direction of the wall portion, the first terminal portion and the limiting body are respectively connected to two ends of the connection body, and at least part of the second terminal portion is clamped between the first terminal portion and the limiting body.

[0007] In the above technical solution, the connector is passed through the hole, the first terminal and the limiting body are respectively connected to the two ends of the connector, and cooperate to clamp the second terminal, so that the connector cannot be separated from the hole along the thickness direction of the wall, so that the first terminal and the second terminal can be tightly connected, reducing the risk of separation of the first terminal and the second terminal, which is beneficial to improving the reliability of the battery cell.

[0008] As an optional technical solution of an embodiment of the present application, the hole portion includes a first hole segment and a second hole segment arranged along the thickness direction of the wall portion, the hole diameter of the second hole segment is larger than the hole diameter of the first hole segment, and the hole wall surface of the first hole segment and the hole wall surface of the second hole segment are connected by a step surface; the connecting body is passed through the first hole segment, and the limiting body is at least partially located in the second hole segment and abuts against the step surface.

[0009] In the above technical solution, the hole portion is a stepped hole. By at least partially arranging the stopper in the second hole segment, the volume of the stopper extending out of the second hole segment in the direction away from the connector can be reduced, and the occupation of the internal space of the battery can be reduced, thereby facilitating the improvement of the energy density of the battery. In addition, since the volume of the stopper extending out of the second hole segment in the direction away from the connector is small, the second terminal portion can be easily welded to the busbar component.

[0010] As an optional technical solution of an embodiment of the present application, along the thickness direction of the wall portion, the second terminal portion has a first surface away from the first terminal portion, and the second hole segment extends to the first surface.

[0011] In the above technical solution, when the second hole segment extends to the first surface, the hole portion is a through hole that penetrates the second terminal portion along the thickness direction of the wall portion, so that it is more convenient to fix the connecting portion and the second terminal portion.

[0012] As an optional technical solution of an embodiment of the present application, along the thickness direction of the wall portion, the second terminal portion has a first surface facing away from the first terminal portion, and the second hole section is at a distance from the first surface.

[0013] In the above technical solution, when there is a distance between the second hole section and the first surface, the hole portion is a blind hole arranged in the second terminal portion, so that the area of ​​the first surface can be larger, thereby facilitating welding of the second terminal portion with the busbar component or the first electrode lead-out portion.

[0014] As an optional technical solution of the embodiment of the present application, the limiting body is completely accommodated in the second hole segment.

[0015] In the above technical solution, when the limiting body is completely received in the second hole section, the limiting body occupies less internal space of the battery, which is more conducive to improving the energy density of the battery and facilitating the welding of the second terminal part to the current collecting component or the first electrode lead-out part.

[0016] As an alternative technical solution of the embodiment of the present application, along the thickness direction of the wall part, the second terminal part has a first surface facing away from the first terminal part, and the limiting body has a second surface facing away from the connecting body, and the second surface is closer to the first terminal part than the first surface.

[0017] In the above technical solution, by making the second surface closer to the first terminal part than the first surface, when welding the second terminal part to the current collecting component or the second terminal part to the first electrode lead-out part, the limiting body is not likely to interfere with the welding, so that the welding of the second terminal part to the current collecting component or the first electrode lead-out part is simpler and more convenient.

[0018] As an alternative technical solution of the embodiment of the present application, along the thickness direction of the wall part, the second terminal part has a first surface facing away from the first terminal part, and the connecting part has a second surface facing away from the first terminal part, and the second surface is closer to the first terminal part than the first surface.

[0019] In the above technical solution, by making the second surface closer to the first terminal part than the first surface, when welding the second terminal part to the current collecting component or the second terminal part to the first electrode lead-out part, the connecting part is not likely to interfere with the welding, so that the welding of the second terminal part to the current collecting component or the first electrode lead-out part is simpler and more convenient.

[0020] As an alternative technical solution of the embodiment of the present application, along the thickness direction of the wall part, the first terminal part has a third surface facing the second terminal part, and the second terminal part has a fourth surface facing the first terminal part, and the third surface and the fourth surface are connected; the connecting part is arranged on the third surface, and the hole part penetrates through the fourth surface.

[0021] In the above technical solution, the connection of the third surface and the fourth surface is conducive to further improving the connection strength between the first terminal part and the second terminal part. By arranging the connecting part on the third surface and the hole part penetrating through the fourth surface, the connection force between the connecting part and the second terminal part is conducive to keeping the connection interface formed by the connection of the third surface and the fourth surface tightly connected, reducing the risk of loosening of the connection interface, being conducive to reducing the internal resistance of the first electrode terminal, and improving the reliability of the battery cell.

[0022] As an alternative technical solution of the embodiment of the present application, the first terminal portion is provided with a first groove, at least a part of the second terminal portion is received in the first groove, and the bottom surface of the first groove is the third surface.

[0023] In the above technical solution, by providing a first groove on the first terminal portion and allowing at least a part of the second terminal portion to be received in the first groove, the first groove can play a positioning role, thereby facilitating the connection of the first terminal portion and the second terminal portion. In addition, the bottom surface of the first groove is the third surface, making it more difficult for the electrolyte to penetrate into the connection interface formed by the connection of the third surface and the fourth surface, further reducing the risk of metal corrosion caused by the penetration of the electrolyte into the connection interface.

[0024] As an alternative technical solution of the embodiment of the present application, the peripheral surface of the connecting portion is connected to the inner wall surface of the hole portion.

[0025] In the above technical solution, when the peripheral surface of the connecting portion is connected to the inner wall surface of the hole portion, the connecting portion and the second terminal portion have a large connecting surface area, which is beneficial to making the connection strength between the first terminal portion and the second terminal portion higher, reducing the risk of separation between the first terminal portion and the second terminal portion, and being beneficial to improving the reliability of the battery cell.

[0026] As an alternative technical solution of the embodiment of the present application, the first terminal portion and the second terminal portion are friction welded.

[0027] In the above technical solution, the connection between the first terminal portion and the second terminal portion is achieved by friction welding, the welding quality is stable, and the connection strength between the first terminal portion and the second terminal portion after welding is relatively high, which is beneficial to reducing the risk of separation between the first terminal portion and the second terminal portion and is beneficial to improving the reliability of the battery cell. On the basis that the connecting portion is fixedly connected to the second terminal portion, further friction welding the first terminal portion and the second terminal portion is beneficial to further improving the connection strength between the first terminal portion and the second terminal portion, further reducing the risk of separation between the first terminal portion and the second terminal portion, and being beneficial to improving the reliability of the battery cell.

[0028] As an alternative technical solution of the embodiment of the present application, along the first direction, the distance between the axis of the connecting portion and the axis of the second terminal portion is L, and the minimum diameter of the second terminal portion is D, satisfying: L / D ≤ 0.1; the first direction is perpendicular to the thickness direction of the wall portion.

[0029] In the above technical solution, when L / D ≤ 0.1, the axes of the connecting portion and the second terminal portion are substantially coincident, thereby facilitating the friction welding of the first terminal portion and the second terminal portion.

[0030] As an alternative technical solution of the embodiment of the present application, the axis of the connecting portion coincides with the axis of the second terminal portion.

[0031] In the above technical solution, when the axes of the connecting portion and the second terminal portion coincide, the friction welding of the first terminal portion and the second terminal portion is simpler and more convenient, and the welding quality is higher.

[0032] As an alternative technical solution of the embodiment of the present application, in the thickness direction of the wall portion, the second terminal portion is disposed on a side of the first terminal portion away from the interior of the housing.

[0033] In the above technical solution, the first terminal portion is closer to the interior of the housing than the second terminal portion, which facilitates the welding of the first terminal portion to the first electrode lead-out portion and the welding of the second terminal portion to the bus bar component.

[0034] As an alternative technical solution of the embodiment of the present application, the battery cell further includes a seal, and at least a part of the seal is disposed between the first terminal portion and the wall portion.

[0035] In the above technical solution, the seal seals the first terminal portion and the wall portion, which can reduce the risk of electrolyte intrusion between the first terminal portion and the second terminal portion causing metal corrosion.

[0036] As an alternative technical solution of the embodiment of the present application, a first groove is provided on a side of the first terminal portion away from the interior of the housing, and at least a part of the second terminal portion is received in the first groove; in the thickness direction of the wall portion, the bottom surface of the first groove is a third surface, and the second terminal portion has a fourth surface facing the first terminal portion, and the third surface and the fourth surface are connected; at least a part of the seal is disposed between the side wall of the first groove and the wall portion.

[0037] In the above technical solution, by providing the first groove on the first terminal portion and receiving at least a part of the second terminal portion in the first groove, the first groove can play a positioning role, thereby facilitating the connection of the first terminal portion and the second terminal portion. In addition, the seal is disposed between the side wall of the first groove and the wall portion, making it more difficult for the electrolyte to penetrate into the connection interface formed by the connection of the third surface and the fourth surface, further reducing the risk of metal corrosion caused by electrolyte intrusion into the connection interface.

[0038] As an alternative technical solution of the embodiment of the present application, the wall portion is provided with a lead-out hole, and at least a part of the seal is located in the lead-out hole; the battery cell includes a first insulating member disposed on a side of the wall portion facing the interior of the housing, and the first insulating member abuts against the seal; and / or the battery cell includes a second insulating member at least partially disposed between the first electrode terminal and the wall portion, and the second insulating member abuts against the seal.

[0039] In the above technical solution, by providing the first insulating member, the first insulating member can insulate and isolate the wall portion and the electrode assembly, reducing the risk of short circuit caused by contact between the wall portion and the electrode assembly. The second insulating member can insulate and isolate the first electrode terminal and the wall portion, reducing the risk of short circuit caused by contact between the first electrode terminal and the wall portion. In addition, the first insulating member and the second insulating member respectively abut against both sides of the seal along the thickness direction of the wall portion, which can limit the position of the seal, hold the seal in the lead-out hole, and enable the seal to stably seal the first terminal portion and the wall portion, further reducing the risk of electrolyte infiltrating into the composite interface of the first terminal portion and the second terminal portion and causing metal corrosion.

[0040] As an alternative technical solution of the embodiment of the present application, along the thickness direction of the wall portion, a part of the first insulating member is clamped between the first terminal portion and the wall portion.

[0041] In the above technical solution, by clamping a part of the first insulating member between the first terminal portion and the wall portion, the first terminal portion and the wall portion cooperate to limit the position of the first insulating member, enabling the first insulating member to stably abut against the seal, and allowing the seal to stably seal the first terminal portion and the wall portion.

[0042] As an alternative technical solution of the embodiment of the present application, the surface of the wall portion facing the inside of the housing is provided with a second groove, the lead-out hole communicates with the second groove, the first insulating member includes an insulating portion received in the second groove, and the insulating portion is clamped between the first terminal portion and the wall portion.

[0043] In the above technical solution, by receiving the insulating portion in the second groove and clamping the insulating portion by the first terminal portion and the wall portion, the occupation of the internal space of the battery cell by the insulating portion can be reduced, which is beneficial to improving the energy density of the battery cell.

[0044] As an alternative technical solution of the embodiment of the present application, the second insulating member is disposed around the second terminal portion, a third groove is provided on the outer peripheral surface of the second terminal portion, and a part of the second insulating member is received in the third groove.

[0045] In the above technical solution, by providing a third groove on the outer peripheral surface of the second terminal portion and receiving a part of the second insulating member in the third groove, the second insulating member can limit the position of the second terminal portion in the radial direction of the lead-out hole.

[0046] As an alternative technical solution of the embodiment of the present application, a limiting protrusion is provided on the surface of the wall portion facing away from the inside of the housing, a fourth groove is provided on the second insulating member, and at least a part of the limiting protrusion is received in the fourth groove.

[0047] In the above technical solution, by providing a limiting protrusion on the surface of the wall portion facing away from the interior of the housing, and providing a fourth groove on the second insulating member to cooperate with the limiting protrusion, a better limiting effect on the second insulating member can be achieved.

[0048] As an alternative technical solution of the embodiment of the present application, the second insulating member is an injection molded part injection molded between the wall portion and the first electrode terminal.

[0049] In the above technical solution, by injection molding the second insulating member between the wall portion and the first electrode terminal, the second insulating member can limit the first electrode terminal and enhance the connection strength between the first electrode terminal and the wall portion.

[0050] As an alternative technical solution of the embodiment of the present application, the wall portion is provided with a lead-out hole, and at least a part of the first terminal portion and / or the second terminal portion is received in the lead-out hole.

[0051] In the above technical solution, by receiving at least a part of the first terminal portion and / or the second terminal portion in the lead-out hole, the occupation of the internal space of the battery cell or the internal space of the battery by the first terminal portion and / or the second terminal portion can be reduced, which is beneficial to improving the energy density of the battery cell or the battery.

[0052] As an alternative technical solution of the embodiment of the present application, a part of the first terminal portion is received in the lead-out hole, and another part of the first terminal portion protrudes from the surface of the wall portion facing the interior of the housing in the direction facing the interior of the housing; and / or a part of the second terminal portion is received in the lead-out hole, and another part of the second terminal portion protrudes from the surface of the wall portion facing away from the interior of the housing in the direction away from the interior of the housing.

[0053] In the above technical solution, a part of the first terminal portion is received in the lead-out hole, which can reduce the occupation of the internal space of the battery cell and improve the energy density of the battery cell. Another part of the first terminal portion protrudes from the surface of the wall portion facing the interior of the housing, so as to facilitate the welding of the first terminal portion to the first electrode lead-out portion. A part of the second terminal portion is received in the lead-out hole, which can reduce the occupation of the internal space of the battery and improve the energy density of the battery. Another part of the second terminal portion protrudes from the surface of the wall portion facing away from the interior of the housing, so as to facilitate the welding of the second terminal portion to the bus bar component.

[0054] Second aspect, an embodiment of the present application further provides a method for manufacturing a battery cell. The method for manufacturing the battery cell includes: Step S100: manufacturing a first electrode terminal; Step S200: providing a housing having a wall portion; Step S300: mounting the first electrode terminal on the wall portion; wherein, the Step S100 includes: Step S110: providing a first terminal portion and a second terminal portion, the first terminal portion is provided with a connecting portion, and the second terminal portion is provided with a hole portion; Step S120: inserting the connecting portion into the hole portion; Step S130: fixedly connecting the connecting portion and the second terminal portion.

[0055] As an optional technical solution of an embodiment of the present application, after the Step S120, the method for manufacturing the battery cell further includes: Step S121: connecting the first terminal portion and the second terminal portion.

[0056] In the above technical solution, on the basis of fixedly connecting the connecting portion and the second terminal portion, further connecting the first terminal portion and the second terminal portion is beneficial to further improve the connection strength between the first terminal portion and the second terminal portion, further reduce the risk of separation between the first terminal portion and the second terminal portion, and is beneficial to improving the reliability of the battery cell.

[0057] As an optional technical solution of an embodiment of the present application, the Step S121 includes: Step S1211: friction welding the first terminal portion and the second terminal portion.

[0058] In the above technical solution, the combination of the first terminal portion and the second terminal portion is realized by friction welding, the welding quality is stable, and the connection strength between the first terminal portion and the second terminal portion after welding is relatively high, which is beneficial to reducing the risk of separation between the first terminal portion and the second terminal portion and is beneficial to improving the reliability of the battery cell.

[0059] As an optional technical solution of an embodiment of the present application, the Step S130 includes: Step S131: riveting and connecting the connecting portion and the second terminal portion.

[0060] In the above technical solution, the fixation of the connecting portion and the second terminal portion is realized by riveting and connecting the connecting portion and the second terminal portion, so that the first terminal portion and the second terminal portion have relatively high connection strength, reduce the risk of separation between the first terminal portion and the second terminal portion, and are beneficial to improving the reliability of the battery cell.

[0061] As an alternative technical solution of the embodiment of the present application, the connecting portion includes a connecting body and a limiting body. The first terminal portion and the limiting body are respectively connected to two ends of the connecting body. The step S130 includes: Step S132: Friction-weld the first terminal portion and the second terminal portion, so that a part of the second terminal portion extrudes material towards between the first terminal portion and the limiting body, so that a part of the second terminal portion is clamped between the first terminal portion and the limiting body.

[0062] In the above technical solution, the connecting portion is prefabricated into a structure having a connecting body and a limiting body, and the connecting portion is accommodated in the hole portion. During the process of friction-welding the first terminal portion and the second terminal portion, a part of the second terminal portion extrudes material towards between the first terminal portion and the limiting body, so that the second terminal portion can be clamped between the first terminal portion and the limiting body, that is, the fixed connection between the connecting portion and the second terminal portion is realized, and the friction welding between the first terminal portion and the second terminal portion is also realized, so that the first terminal portion and the second terminal portion have a relatively high connection strength, reducing the risk of separation between the first terminal portion and the second terminal portion, which is beneficial to improving the reliability of the battery cell.

[0063] As an alternative technical solution of the embodiment of the present application, the step S130 includes: Step S133: Connect the peripheral surface of the connecting portion to the inner wall surface of the hole portion.

[0064] In the above technical solution, when the peripheral surface of the connecting portion is connected to the inner wall surface of the hole portion, the connecting portion and the second terminal portion have a relatively large connection surface, which is beneficial to making the first terminal portion and the second terminal portion have a relatively high connection strength, reducing the risk of separation between the first terminal portion and the second terminal portion, which is beneficial to improving the reliability of the battery cell.

[0065] As an alternative technical solution of the embodiment of the present application, the wall portion is provided with a lead-out hole; the step S300 includes: Step S310: Sleeve a sealing member outside the first terminal portion; Step S320: Provide a first insulating member on one side of the wall portion facing the inside of the housing; Step S330: Insert the first electrode terminal into the lead-out hole, and make the first terminal portion press a part of the first insulating member against the wall portion; Step S340: Injection-mold a second insulating member between the second terminal portion and the wall portion, so that the first insulating member and the second insulating member respectively abut against both sides of the sealing member.

[0066] In the above technical solution, by providing the first insulating member, the first insulating member can insulate and isolate the wall portion and the electrode assembly, reducing the risk of short circuit caused by contact between the wall portion and the electrode assembly. The second insulating member can insulate and isolate the first electrode terminal and the wall portion, reducing the risk of short circuit caused by contact between the first electrode terminal and the wall portion. Additionally, the first insulating member and the second insulating member respectively abut against both sides of the sealing member in the thickness direction of the wall portion, which can limit the position of the sealing member, hold the sealing member in the lead-out hole, and enable the sealing member to stably seal the first terminal portion and the wall portion, further reducing the risk of electrolyte infiltrating into the composite interface of the first terminal portion and the second terminal portion and causing metal corrosion.

[0067] In a third aspect, an embodiment of the present application further provides a battery, and the battery includes the above battery cell.

[0068] In a fourth aspect, an embodiment of the present application further provides an electrical device, and the electrical device includes the above battery cell, and the battery cell is used to provide electrical energy for the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can also be obtained based on these drawings without creative efforts.

[0070] Figure 1 Structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0071] Figure 2 Explosion view of a battery provided by some embodiments of the present application;

[0072] Figure 3 Structural schematic diagram of a battery cell provided by some embodiments of the present application;

[0073] Figure 4 Explosion view of a battery cell provided by some embodiments of the present application;

[0074] Figure 5 Structural schematic diagram of a wall portion provided by some embodiments of the present application;

[0075] Figure 6 Top view schematic diagram of a wall portion provided by some embodiments of the present application;

[0076] Figure 7 For Figure 6 Cross-sectional view at position A-A in

[0077] Figure 8 ForFigure 7 Enlarged view of position B;

[0078] Figure 9 Schematic structural diagram of the first electrode terminal provided in some embodiments of the present application;

[0079] Figure 10 Exploded view of the first electrode terminal provided in some embodiments of the present application;

[0080] Figure 11 Cross-sectional view of the wall portion provided in some other embodiments of the present application;

[0081] Figure 12 Cross-sectional view of the wall portion provided in some other embodiments of the present application;

[0082] Figure 13 Schematic block diagram of the method for manufacturing a battery cell provided in some embodiments of the present application;

[0083] Figure 14 Schematic block diagram of the method for manufacturing a battery cell provided in some other embodiments of the present application;

[0084] Figure 15 Schematic block diagram of the method for manufacturing a battery cell provided in some other embodiments of the present application;

[0085] Figure 16 Schematic block diagram of the method for manufacturing a battery cell provided in some other embodiments of the present application;

[0086] Figure 17 Schematic block diagram of the method for manufacturing a battery cell provided in some other embodiments of the present application;

[0087] Figure 18 Cross-sectional view of the connection portion and the second terminal portion before riveting provided in some embodiments of the present application;

[0088] Figure 19 Cross-sectional view of the connection portion and the second terminal portion after riveting provided in some embodiments of the present application;

[0089] Figure 20 Schematic block diagram of the method for manufacturing a battery cell provided in some other embodiments of the present application;

[0090] Figure 21 Cross-sectional view of the first terminal portion and the second terminal portion before friction welding provided in some embodiments of the present application;

[0091] Figure 22 Cross-sectional view of the first terminal portion and the second terminal portion after friction welding provided in some embodiments of the present application;

[0092] Figure 23Schematic block diagram of a battery cell manufacturing method provided for some other embodiments of the present application;

[0093] Figure 24 Cross-sectional view of a first electrode terminal provided for some other embodiments of the present application;

[0094] Figure 25 Schematic block diagram of a battery cell manufacturing method provided for some other embodiments of the present application.

[0095] Icons: 10 - box body; 11 - first part; 12 - second part; 20 - battery cell; 21 - outer shell; 211 - housing; 212 - end cap; 213 - wall portion; 2131 - lead-out hole; 2132 - second groove; 2133 - limiting protrusion; 22 - first electrode terminal; 221 - first terminal portion; 2211 - first groove; 22111 - third surface; 22112 - groove side wall; 222 - second terminal portion; 2221 - third groove; 2222 - hole portion; 22221 - first hole section; 22222 - second hole section; 22223 - stepped surface; 2223 - fourth groove; 2224 - fourth surface; 2225 - first surface; 223 - connecting portion; 2231 - connecting body; 2232 - limiting body; 22321 - second surface; 23 - second electrode terminal; 24 - electrode assembly; 241 - main body portion; 242 - first electrode lead-out portion; 2421 - first tab; 2422 - first current collector member; 243 - second electrode lead-out portion; 2431 - second tab; 2432 - second current collector member; 25 - first insulating member; 251 - insulating portion; 26 - second insulating member; 27 - seal; 100 - battery; 200 - controller; 300 - motor; 1000 - vehicle. Detailed implementation manners

[0096] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0097] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above accompanying drawings are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0098] Reference to "embodiment" in this application means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0099] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0100] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0101] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the accompanying drawings of the embodiments of this application, as well as the overall thickness, length, width, etc. of the integrated device are only for illustrative purposes and should not constitute any limitation to this application.

[0102] The term "plurality" as used in this application refers to two or more (including two).

[0103] In the embodiments of this application, the battery cell can be a secondary battery, and a secondary battery refers to a battery cell that can activate the active material through charging and continue to be used after the battery cell discharges.

[0104] 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0105] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can play a role in preventing short circuit between the positive and negative electrodes to a certain extent, and at the same time allows active ions to pass through.

[0106] In some embodiments, the positive electrode can be a positive electrode tab, and the positive electrode tab can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0107] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0108] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0109] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphate can include but are not limited to lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite material of lithium manganese iron phosphate and carbon, etc. Examples of lithium transition metal oxides can include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn1 / 3 O2 (which can also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0110] In some embodiments, the positive electrode may employ a foam metal. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, etc. When the foam metal serves as the positive electrode, the positive electrode active material may not be provided on the surface of the foam metal, and of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may be filled and / or deposited in the foam metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0111] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0112] As an example, the negative electrode current collector may employ a metal foil, foam metal or composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. may be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0113] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0114] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on either or both of the two opposite surfaces of the negative electrode current collector.

[0115] As an example, the negative electrode active material can be a negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material can be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0116] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0117] In some embodiments, the electrode assembly further includes a separator, and the separator is disposed between the positive electrode and the negative electrode.

[0118] In some embodiments, the separator is a separator membrane. The types of separator membranes can be various, and any known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0119] As an example, the material of the separator membrane can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator membrane can be a single-layer film or a multi-layer composite film. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a single component located between the positive and negative electrodes or attached to the surfaces of the positive and negative electrodes.

[0120] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously plays the role of transmitting ions and isolating the positive and negative electrodes.

[0121] In some embodiments, the battery cell further includes an electrolyte, and the electrolyte plays the role of conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Among them, the liquid electrolyte includes electrolyte salts and solvents.

[0122] In some embodiments, the electrolyte salts can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluorooxalate phosphate.

[0123] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0124] Among them, the gel electrolyte includes a polymer as the skeleton network of the electrolyte, combined with an ionic liquid-lithium salt.

[0125] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0126] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0127] As an example, the inorganic solid electrolyte may include oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of halide solid electrolytes, nitride solid electrolytes and hydride solid electrolytes.

[0128] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0129] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0130] In some embodiments, the electrode assembly is a laminated structure.

[0131] As an example, multiple positive electrode sheets and multiple negative electrode sheets may be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0132] As an example, multiple positive electrode sheets may be provided, and the negative electrode sheet is folded to form multiple folded segments stacked on top of each other, and a positive electrode sheet is clamped between adjacent folded segments.

[0133] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments arranged in layers.

[0134] As an example, a plurality of separators can be provided and are respectively disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0135] As an example, the separators can be continuously provided and are disposed between any adjacent positive electrode sheets or negative electrode sheets by means of folding or winding.

[0136] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, or the like.

[0137] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0138] 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 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.

[0139] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, the housing can protect the electrode assembly and to a certain extent prevent, for example, electrolyte leakage. When the housing is a non-sealed structure, the housing can protect the electrode assembly, and a sealed bag can further be included between the housing and the electrode assembly. The sealed bag is used to encapsulate the electrode assembly and the electrolyte, etc. Specifically, the sealed bag can be a bag-shaped insulating member or an aluminum-plastic film.

[0140] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes, but is not limited to, a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc.

[0141] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity.

[0142] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0143] In some embodiments, the battery can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

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

[0145] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0146] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied to electric transportation tools such as electric bicycles, electric motorcycles, and electric vehicles, as well as multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of batteries, the market demand is also constantly increasing.

[0147] The development of battery technology needs to consider various design factors at the same time. For example, performance parameters such as battery life, energy density, discharge capacity, charge-discharge rate, etc. In addition, the reliability of the battery also needs to be considered. However, the current reliability of batteries is poor.

[0148] For general batteries, the materials of the negative electrode tab of the battery cell and the current collecting component are different. For example, the negative electrode tab is generally made of copper, and the current collecting component is generally made of aluminum. In order to reduce the welding difficulty between the electrode terminal and the negative electrode tab, and between the electrode terminal and the current collecting component, in the prior art, generally two terminal parts with different materials are compounded to form an electrode terminal. One terminal part has the same material as the negative electrode tab and is used for welding with the negative electrode tab, and the other terminal part has the same material as the current collecting component and is used for welding with the current collecting component.

[0149] However, the connection strength between the two terminal parts is poor. When the electrode terminal is subjected to an external force, it is easy to cause the separation of the two terminal parts. For example, when the current collecting component pulls the terminal part connected to it, it is easy to cause the separation of the two terminal parts, resulting in poor reliability of the battery.

[0150] In view of this, the embodiments of the present application provide a battery cell. The battery cell includes a housing, an electrode assembly, and a first electrode terminal. The housing has a wall portion. The electrode assembly is disposed inside the housing. The first electrode terminal is disposed on the wall portion. The first electrode terminal includes a first terminal part and a second terminal part. The first terminal part and the second terminal part are made of different materials. The first terminal part and the second terminal part are stacked along the thickness direction of the wall portion. Wherein, the first terminal part is provided with a connecting portion, the second terminal part is provided with a hole portion, and at least part of the connecting portion is disposed in the hole portion and is fixedly connected to the second terminal part.

[0151] The materials of the first terminal part and the second terminal part of the first electrode terminal are different, which facilitates welding of one of the first terminal part and the second terminal part to the first electrode lead-out part, and welding of the other to the bus bar component. In addition, a connecting part is provided on the first terminal part, and a hole part is provided on the second terminal part. The connecting part is at least partially disposed in the hole part and fixedly connected to the second terminal part, so that the first terminal part and the second terminal part have a high connection strength, reducing the risk of separation between the first terminal part and the second terminal part, which is beneficial to improving the reliability of the battery cell.

[0152] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using the batteries.

[0153] The electrical equipment may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a stationary or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, which may include but are not limited to an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact drill, a concrete vibrator, an electric planer, etc.

[0154] For the convenience of description in the following embodiments, the electrical equipment is taken as the vehicle 1000 as an example for illustration.

[0155] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, an extended-range electric vehicle, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 may be disposed at the bottom, the head, or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000. For example, the battery 100 may be used as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0156] In some embodiments of the present application, the battery 100 may not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0157] Please refer to Figure 2 , Figure 2An exploded view of the battery 100 provided by some embodiments of the present application. The battery 100 includes a box body 10 and battery cells 20, and the battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define an accommodation space for accommodating the battery cells 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure. The first part 11 covers the open side of the second part 12 so that the first part 11 and the second part 12 jointly define an accommodation space; the first part 11 and the second part 12 may also both be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0158] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery 100 can also be in the form that multiple battery cells 20 are first connected in series, parallel, or in a mixed connection to form battery modules, and then the multiple battery modules are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the box body 10. The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for realizing the electrical connection among the multiple battery cells 20.

[0159] Among them, each battery cell 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0160] Please refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , Figure 3 A schematic structural view of the battery cell 20 provided by some embodiments of the present application. Figure 4 An exploded view of the battery cell 20 provided by some embodiments of the present application. Figure 5 A schematic structural view of the wall portion 213 provided by some embodiments of the present application. Figure 6 A top view schematic of the wall portion 213 provided by some embodiments of the present application. Figure 7 isFigure 6 Cross-sectional view taken along line A-A in [diagram name]. Figure 8 For Figure 7 Enlarged view of position B in [diagram name]. An embodiment of the present application provides a battery cell 20, which includes a housing 21, an electrode assembly 24, and a first electrode terminal 22. The housing 21 has a wall portion 213. The electrode assembly 24 is disposed inside the housing 21, and the first electrode terminal 22 is disposed on the wall portion 213. The first electrode terminal 22 includes a first terminal portion 221 and a second terminal portion 222. The first terminal portion 221 and the second terminal portion 222 are made of different materials and are stacked along the thickness direction of the wall portion 213. Among them, the first terminal portion 221 is provided with a connecting portion 223, and the second terminal portion 222 is provided with a hole portion 2222. The connecting portion 223 is at least partially disposed in the hole portion 2222 and is fixedly connected to the second terminal portion 222.

[0161] The battery cell 20 refers to the smallest unit that makes up the battery 100.

[0162] The housing 211 has a receiving space with one end open, and the receiving space is used to receive the electrode assembly 24. The end cap 212 is connected to the housing 211 and closes the opening.

[0163] The end cap 212 refers to a component that covers the opening of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 212 can be adapted to the shape of the housing 211 to cooperate with the housing 211. Optionally, the end cap 212 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 212 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 20 to have higher structural strength and improved reliability. The material of the end cap 212 can include but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0164] The housing 211 is a component for cooperating with the end cap 212 to form the internal environment of the battery cell 20. Among them, the formed internal environment can be used to accommodate the electrode assembly 24, the electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. An opening can be provided on the housing 211, and the end cap 212 is covered at the opening to form the internal environment of the battery cell 20. Without limitation, the end cap 212 and the housing 211 can also be integrated. Specifically, the end cap 212 and the housing 211 can first form a common joint surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 211, the end cap 212 is then covered on the housing 211. The housing 211 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 24. The material of the housing 211 can include but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0165] The electrode assembly 24 is a component in the battery cell 20 where an electrochemical reaction occurs. The housing 211 can contain one or more electrode assemblies 24. The electrode assembly 24 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and generally, a separator is provided between the positive electrode plate and the negative electrode plate. The parts of the positive electrode plate and the negative electrode plate with active materials constitute the main body 241 of the electrode assembly 24, and the parts of the positive electrode plate and the negative electrode plate without active materials respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located at one end of the main body together or at both ends of the main body respectively. During the charging and discharging process of the battery 100, the positive active material and the negative active material react with the electrolyte.

[0166] The wall portion 213 can be the end cap 212 of the outer shell 21 or a wall of the housing 211 of the outer shell 21. Exemplarily, in Figure 3 and Figure 4 , the wall portion 213 is the end cap 212. In some other embodiments, the wall portion 213 can be a side wall of the housing 211 adjacent to and connected to the end cap 212. In still some other embodiments, the wall portion 213 can also be the bottom wall of the housing 211 opposite to the end cap 212.

[0167] The first electrode terminal 22 is used for electrically connecting with the first electrode lead-out part 242 of the electrode assembly 24 to input or output the electric energy of the battery cell 20. The first electrode lead-out part 242 is a structure for leading out the electric energy of the main body part 241 or introducing the electric energy into the main body part 241. The first electrode lead-out part 242 includes a first tab 2421, and the first tab 2421 is the above-mentioned positive tab or negative tab, and the first tab 2421 can be directly connected to the first electrode terminal 22. In some other embodiments, the first electrode lead-out part 242 may further include other electrical connection components connected to the first tab 2421. For example, the first electrode lead-out part 242 may further include a first current collector member 2422, and the first current collector member 2422 connects the first tab 2421 and the first electrode terminal 22 to direct the electric energy of the electrode assembly 24 to the first electrode terminal 22 or receive the electric energy introduced from the first electrode terminal 22.

[0168] The position where the first electrode terminal 22 is arranged can be used to determine which wall of the housing 21 is the wall part 213. For example, when the first electrode terminal 22 is arranged on the end cover 212, then the end cover 212 is the wall part 213. When the first electrode terminal 22 is arranged on the bottom wall of the housing 211, then the bottom wall is the wall part 213. When the first electrode terminal 22 is arranged on the side wall of the housing 211, then the side wall is the wall part 213.

[0169] One of the first terminal part 221 and the second terminal part 222 is made of the same material as the first electrode lead-out part 242 and is used for welding connection with the first electrode lead-out part 242, and the other of the first terminal part 221 and the second terminal part 222 is made of the same material as the bus bar component and is used for welding connection with the bus bar component.

[0170] Please refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , in the embodiment shown in the figure, the first terminal part 221 is made of the same material as the first electrode lead-out part 242 and is used for welding connection with the first electrode lead-out part 242, and the second terminal part 222 is made of the same material as the bus bar component and is used for welding connection with the bus bar component.

[0171] "The material of the first terminal portion 221 is the same as that of the first electrode lead-out portion 242" means that: the main components of the first terminal portion 221 and the first electrode lead-out portion 242 are the same. Among them, the main component of the first terminal portion 221 is the component with a content of more than 50% in the components of the first terminal portion 221. Similarly, the main component of the first electrode lead-out portion 242 is the component with a content of more than 50% in the components of the first electrode lead-out portion 242. The material of the first electrode lead-out portion 242 can also be various, such as copper or aluminum, etc. If the first electrode lead-out portion 242 includes a positive electrode tab, the material of the first electrode lead-out portion 242 is usually aluminum, and the main component of the first terminal portion 221 is also aluminum component with a content of more than 50%. If the first electrode lead-out portion 242 includes a negative electrode tab, the material of the first electrode lead-out portion 242 is usually copper, and the main component of the first terminal portion 221 is also copper component with a content of more than 50%. That is to say, the material of the first terminal portion 221 being the same as that of the first electrode lead-out portion 242 means that the main components of the first terminal portion 221 and the first electrode lead-out portion 242 are the same. For example, if both the first terminal portion 221 and the first electrode lead-out portion 242 are of a single material, such as copper or aluminum, etc., then the materials of the first terminal portion 221 and the first electrode lead-out portion 242 are composed of the same metal elements; if the first terminal portion 221 and the first electrode lead-out portion 242 are of alloy material or mixed material, such as aluminum alloy or steel, etc., then the materials of the first terminal portion 221 and the first electrode lead-out portion 242 being different means that the main components of the first terminal portion 221 and the first electrode lead-out portion 242 are different, that is, the components with a content of more than 50% in the alloy material or mixed material are different.

[0172] "The material of the second terminal portion 222 is the same as that of the bus bar component" means that: the main components of the second terminal portion 222 and the bus bar component are the same. Among them, the main component of the second terminal portion 222 is the component with a content of more than 50% in the components of the second terminal portion 222. Similarly, the main component of the bus bar component is the component with a content of more than 50% in the components of the bus bar component. The material of the bus bar component can also be various, such as copper or aluminum, etc. If the bus bar component is aluminum, the main component of the second terminal portion 222 is also aluminum component with a content of more than 50%. That is to say, the material of the second terminal portion 222 being the same as that of the bus bar component means that the main components of the second terminal portion 222 and the bus bar component are the same. For example, if both the second terminal portion 222 and the bus bar component are of a single material, such as copper or aluminum, etc., then the materials of the second terminal portion 222 and the bus bar component are composed of the same metal elements; if the second terminal portion 222 and the bus bar component are of alloy material or mixed material, such as aluminum alloy or steel, etc., then the materials of the second terminal portion 222 and the bus bar component being different means that the main components of the second terminal portion 222 and the bus bar component are different, that is, the components with a content of more than 50% in the alloy material or mixed material are different.

[0173] The statement that "the first terminal portion 221 and the second terminal portion 222 are made of different materials" means that the main components of the first terminal portion 221 and the second terminal portion 222 are different. Among them, the main component of the first terminal portion 221 is the component with a content of more than 50% in the components of the first terminal portion 221. Similarly, the main component of the second terminal portion 222 is the component with a content of more than 50% in the components of the second terminal portion 222. That is to say, the fact that the material of the first terminal portion 221 is different from that of the second terminal portion 222 means that the main components of the first terminal portion 221 and the second terminal portion 222 are different. For example, if both the first terminal portion 221 and the second terminal portion 222 are of a single material, such as copper or aluminum, then the materials of the first terminal portion 221 and the second terminal portion 222 are composed of different metal elements; if the first terminal portion 221 and the second terminal portion 222 are of alloy materials or composite materials, such as aluminum alloy or steel, etc., then the difference in the materials of the first terminal portion 221 and the second terminal portion 222 is that the main components of the first terminal portion 221 and the second terminal portion 222 are different, that is, the components with a content of more than 50% in the alloy material or composite material are different. Optionally, the material of the first terminal portion 221 can be copper, and the material of the second terminal portion 222 can be aluminum.

[0174] Please refer to Figure 8 , the thickness direction of the wall portion 213 is the X direction shown in the figure.

[0175] The first terminal portion 221 and the second terminal portion 222 are arranged along the thickness direction of the wall portion 213. Along the thickness direction of the wall portion 213, one of the first terminal portion 221 and the second terminal portion 222 is closer to the inside of the housing 21 than the other of the first terminal portion 221 and the second terminal portion 222. Please refer to Figure 8 , in the embodiment shown in the figure, the first terminal portion 221 is closer to the inside of the housing 21 than the second terminal portion 222.

[0176] The connecting portion 223 is a component for fixedly connecting with the second terminal portion 222. The hole portion 2222 can be a through hole provided in the second terminal portion 222, or the hole portion 2222 can be a blind hole provided in the second terminal portion 222. The connecting portion 223 can be partially received in the hole portion 2222, and the other part is located outside the hole portion 2222. The connecting portion 223 can also be completely received in the hole portion 2222. In some embodiments, the connecting portion 223 is riveted to the second terminal portion 222. In other embodiments, the connecting portion 223 is welded to the second terminal portion 222. In still other embodiments, the connecting portion 223 is adhesively bonded to the second terminal portion 222. The connecting portion 223 can be separately provided and connected with the first terminal portion 221, or the connecting portion 223 can be integrally formed with the first terminal portion 221.

[0177] The materials of the first terminal portion 221 and the second terminal portion 222 of the first electrode terminal 22 are different, which facilitates welding of one of the first terminal portion 221 and the second terminal portion 222 to the first electrode lead-out portion 242, and welding of the other of the first terminal portion 221 and the second terminal portion 222 to the bus bar component. In addition, a connecting portion 223 is provided on the first terminal portion 221, and a hole portion 2222 is provided on the second terminal portion 222. The connecting portion 223 is at least partially disposed in the hole portion 2222 and fixedly connected to the second terminal portion 222, so that the first terminal portion 221 and the second terminal portion 222 have a high connection strength, reducing the risk of separation between the first terminal portion 221 and the second terminal portion 222, which is beneficial to improving the reliability of the battery cell 20.

[0178] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 , Figure 9 which is a schematic structural diagram of the first electrode terminal 22 provided by some embodiments of the present application. Figure 10 which is an exploded view of the first electrode terminal 22 provided by some embodiments of the present application. In some embodiments, the connecting portion 223 includes a connecting body 2231 and a limiting body 2232. The connecting body 2231 is at least partially received in the hole portion 2222. Along the thickness direction of the wall portion 213, the first terminal portion 221 and the limiting body 2232 are respectively connected to both ends of the connecting body 2231, and at least a part of the second terminal portion 222 is clamped between the first terminal portion 221 and the limiting body 2232.

[0179] The limiting body 2232 is disposed opposite to the first terminal portion 221 along the thickness direction of the wall portion 213. The connecting body 2231 extends along the thickness direction of the wall portion 213 and connects the limiting body 2232 and the first terminal portion 221.

[0180] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 ,the first terminal portion 221 and the limiting body 2232 are respectively connected to both ends of the connecting body 2231 along the thickness direction of the wall portion 213. The first terminal portion 221 and the limiting body 2232 can cooperate to clamp at least a part of the second terminal portion 222, thereby connecting the first terminal portion 221 and the second terminal portion 222 together.

[0181] The connecting body 2231 is passed through the hole portion 2222, and the first terminal portion 221 and the limiting body 2232 are respectively connected to the two ends of the connecting body 2231, and cooperate to clamp the second terminal portion 222, so that the connecting body 2231 cannot be separated from the hole portion 2222 along the thickness direction of the wall portion 213, so that the first terminal portion 221 and the second terminal portion 222 can be tightly connected, reducing the risk of separation of the first terminal portion 221 and the second terminal portion 222, which is beneficial to improving the reliability of the battery cell 20.

[0182] Please refer to Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 In some embodiments, the hole portion 2222 includes a first hole segment 22221 and a second hole segment 22222 arranged along the thickness direction of the wall portion 213, and the aperture of the second hole segment 22222 is larger than the aperture of the first hole segment 22221. The hole wall surface of the first hole segment 22221 and the hole wall surface of the second hole segment 22222 are connected by a step surface 22223. The connecting body 2231 is disposed in the first hole segment 22221, and the limiting body 2232 is at least partially located in the second hole segment 22222 and abuts against the step surface 22223.

[0183] The hole portion 2222 is a stepped hole. The hole portion 2222 includes a first hole section 22221 and a second hole section 22222, and the first hole section 22221 and the second hole section 22222 are arranged along the thickness direction of the wall portion 213. Among them, the first hole section 22221 extends to the surface of the second terminal portion 222 facing the first terminal portion 221, the aperture of the first hole section 22221 is smaller than the aperture of the second hole section 22222, and the first hole section 22221 is closer to the first terminal portion 221 than the second hole section 22222. The stepped hole has a stepped surface 22223, and the stepped surface 22223 is a plane connecting the hole wall surface of the first hole section 22221 and the hole wall surface of the second hole section 22222.

[0184] The connecting body 2231 is partially or completely accommodated in the first hole section 22221 , the limiting body 2232 is partially or completely accommodated in the second hole section 22222 , and the limiting body 2232 abuts against the step surface 22223 , so that the limiting body 2232 and the first terminal portion 221 can cooperate to clamp at least a portion of the second terminal portion 222 .

[0185] The hole portion 2222 is a stepped hole. By disposing the limiting body 2232 at least partially within the second hole segment 22222, the volume of the limiting body 2232 extending out of the second hole segment 22222 in the direction away from the connecting body 2231 can be reduced, thereby reducing the occupation of the internal space of the battery 100, which is beneficial to improving the energy density of the battery 100. Additionally, since the volume of the limiting body 2232 extending out of the second hole segment 22222 in the direction away from the connecting body 2231 is small, it is also convenient for welding the second terminal portion 222 to the busbar component.

[0186] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 , in some embodiments, along the thickness direction of the wall portion 213, the second terminal portion 222 has a first surface 2225 facing away from the first terminal portion 221, and the second hole segment 22222 extends to the first surface 2225.

[0187] The first hole segment 22221 extends to the surface of the second terminal portion 222 facing the first terminal portion 221, and the second hole segment 22222 extends to the first surface 2225 of the second terminal portion 222 facing away from the first terminal portion 221. Then the hole portion 2222 is a through hole penetrating the second terminal portion 222 along the thickness direction of the wall portion 213.

[0188] When the second hole segment 22222 extends to the first surface 2225, the hole portion 2222 is a through hole penetrating the second terminal portion 222 along the thickness direction of the wall portion 213. In this way, it is more convenient to fixedly connect the connecting portion 223 to the second terminal portion 222. For example, when the connecting portion 223 is riveted to the second terminal portion 222, the connecting portion 223 can be riveted through the second hole segment 22222.

[0189] Please refer to Figure 11 , Figure 11 is a cross-sectional view of the wall portion 213 provided in some other embodiments of the present application. In some other embodiments, along the thickness direction of the wall portion 213, the second terminal portion 222 has a first surface 2225 facing away from the first terminal portion 221, and the second hole segment 22222 is spaced from the first surface 2225.

[0190] The second hole segment 22222 is spaced from the first surface 2225, that is, the second hole segment 22222 does not penetrate the first surface 2225. At this time, the hole portion 2222 is a blind hole extending from the surface of the second terminal portion 222 facing the first terminal portion 221 towards the first surface 2225.

[0191] When the second hole section 22222 is at a distance from the first surface 2225, the hole portion 2222 is a blind hole provided in the second terminal portion 222. In this way, the area of the first surface 2225 can be larger, facilitating the welding of the second terminal portion 222 to the bus bar component or the first electrode lead-out portion 242.

[0192] Please refer to Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 , in some embodiments, the limiting body 2232 is completely received within the second hole section 22222.

[0193] In the thickness direction of the wall portion 213, the second terminal portion 222 has a first surface 2225 facing away from the first terminal portion 221. The limiting body 2232 has a second surface 22321 facing away from the first terminal portion 221. When the limiting body 2232 is completely received within the second hole section 22222, the first surface 2225 can be flush with the second surface 22321, or the second surface 22321 is closer to the first terminal portion 221 than the first surface 2225.

[0194] When the limiting body 2232 is completely received within the second hole section 22222, the limiting body 2232 occupies less internal space of the battery 100, which is more conducive to improving the energy density of the battery 100 and facilitating the welding of the second terminal portion 222 to the bus bar component or the first electrode lead-out portion 242.

[0195] Optionally, in the thickness direction of the wall portion 213, the second terminal portion 222 has a first surface 2225 facing away from the first terminal portion 221. The limiting body 2232 has a second surface 22321 facing away from the connecting body 2231. The second surface 22321 is closer to the first terminal portion 221 than the first surface 2225.

[0196] By making the second surface 22321 closer to the first terminal portion 221 than the first surface 2225, when welding the second terminal portion 222 to the bus bar component or the second terminal portion 222 to the first electrode lead-out portion 242, the limiting body 2232 is not likely to interfere with the welding, making the welding of the second terminal portion 222 to the bus bar component or the first electrode lead-out portion 242 simpler and more convenient.

[0197] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8, in some embodiments, in the thickness direction of the wall portion 213, the second terminal portion 222 has a first surface 2225 facing away from the first terminal portion 221, the connecting portion 223 has a second surface 22321 facing away from the first terminal portion 221, and the second surface 22321 is closer to the first terminal portion 221 than the first surface 2225.

[0198] By making the second surface 22321 closer to the first terminal portion 221 than the first surface 2225, when welding the second terminal portion 222 to the bus bar component or the second terminal portion 222 to the first electrode lead portion 242, the connecting portion 223 is not likely to interfere with the welding, thereby making the welding of the second terminal portion 222 to the bus bar component or the first electrode lead portion 242 simpler and more convenient.

[0199] Please refer to Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , in some embodiments, in the thickness direction of the wall portion 213, the first terminal portion 221 has a third surface 22111 facing the second terminal portion 222, the second terminal portion 222 has a fourth surface 2224 facing the first terminal portion 221, and the third surface 22111 and the fourth surface 2224 are connected. The connecting portion 223 is disposed on the third surface 22111. The hole portion 2222 penetrates through the fourth surface 2224.

[0200] The third surface 22111 is the surface of the first terminal portion 221 facing the second terminal portion 222. The fourth surface 2224 is the surface of the second terminal portion 222 facing the first terminal portion 221. The third surface 22111 and the fourth surface 2224 are connected to form a connection interface.

[0201] The connection between the third surface 22111 and the fourth surface 2224 can be achieved by methods such as solid-liquid combination method, solid-phase combination method, hot rolling of laminated plates, diffusion bonding method, surfacing method, surfacing and hot rolling method, etc.

[0202] One end of the hole portion 2222 extends to the fourth surface 2224, the connecting portion 223 protrudes from the third surface 22111, the connecting portion 223 passes through the hole portion 2222, and is fixedly connected to the second terminal portion 222.

[0203] The third surface 22111 and the fourth surface 2224 are connected, which is beneficial to further improve the connection strength between the first terminal portion 221 and the second terminal portion 222. By disposing the connecting portion 223 on the third surface 22111 and the hole portion 2222 penetrating the fourth surface 2224, the connecting force of the connecting portion 223 connected to the second terminal portion 222 is beneficial to keep the connection interface formed by the connection of the third surface 22111 and the fourth surface 2224 tightly connected, reducing the risk of loosening of the connection interface, being beneficial to reducing the internal resistance of the first electrode terminal 22, and enhancing the reliability of the battery cell 20.

[0204] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 , in some embodiments, the first terminal portion 221 is provided with a first groove 2211, and at least a part of the second terminal portion 222 is received in the first groove 2211. The bottom surface of the first groove 2211 is the third surface 22111.

[0205] Along the thickness direction of the wall portion 213, a first groove 2211 is provided on the side of the first terminal portion 221 facing the second terminal portion 222. Part or all of the second terminal portion 222 is received in the first groove 2211.

[0206] Wherein, the bottom surface of the first groove 2211 is the third surface 22111, the bottom surface of the first groove 2211 and the fourth surface 2224 are connected to form a connection interface, and the connecting portion 223 is disposed on the bottom surface of the first groove 2211.

[0207] By providing the first groove 2211 on the first terminal portion 221 and enabling at least a part of the second terminal portion 222 to be received in the first groove 2211, the first groove 2211 can play a positioning role, thereby facilitating the connection of the first terminal portion 221 and the second terminal portion 222. In addition, the bottom surface of the first groove 2211 is the third surface 22111, making it more difficult for the electrolyte to penetrate into the connection interface formed by the connection of the third surface 22111 and the fourth surface 2224, further reducing the risk of metal corrosion caused by the penetration of the electrolyte into the connection interface.

[0208] Please refer to Figure 12 , Figure 12 is a cross-sectional view of the wall portion 213 provided in still other embodiments of the present application. In still other embodiments, the peripheral surface of the connecting portion 223 is connected to the hole wall surface of the hole portion 2222.

[0209] In some embodiments, the peripheral surface of the connecting portion 223 is connected to the hole wall surface of the hole portion 2222 by welding. In other embodiments, the peripheral surface of the connecting portion 223 is connected to the hole wall surface of the hole portion 2222 by welding and bonding.

[0210] When the circumferential surface of the connecting portion 223 is connected to the hole wall surface of the hole portion 2222, the connecting portion 223 and the second terminal portion 222 have a relatively large connecting surface, which is beneficial to making the first terminal portion 221 and the second terminal portion 222 have a high connecting strength, reducing the risk of separation between the first terminal portion 221 and the second terminal portion 222, and being beneficial to improving the reliability of the battery cell 20.

[0211] In some embodiments, the first terminal portion 221 and the second terminal portion 222 are friction welded.

[0212] Friction welding refers to a welding method in which heat generated by friction on the contact surface of the workpiece is used as the heat source, and the workpiece undergoes plastic deformation under pressure for welding.

[0213] By friction welding to realize the connection between the first terminal portion 221 and the second terminal portion 222, the welding quality is stable, and the connection strength of the first terminal portion 221 and the second terminal portion 222 after welding is relatively high, which is beneficial to reducing the risk of separation between the first terminal portion 221 and the second terminal portion 222, and being beneficial to improving the reliability of the battery cell 20. On the basis that the connecting portion 223 is fixedly connected to the second terminal portion 222, further friction welding the first terminal portion 221 and the second terminal portion 222 is beneficial to further improving the connection strength between the first terminal portion 221 and the second terminal portion 222, further reducing the risk of separation between the first terminal portion 221 and the second terminal portion 222, and being beneficial to improving the reliability of the battery cell 20.

[0214] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 , in some embodiments, along the first direction, the distance between the axis of the connecting portion 223 and the axis of the second terminal portion 222 is L. The minimum diameter of the second terminal portion 222 is D, satisfying: L / D ≤ 0.1. The first direction is perpendicular to the thickness direction of the wall portion 213.

[0215] L represents the distance between the axis of the connecting portion 223 and the axis of the second terminal portion 222 along the first direction. The first direction is perpendicular to the thickness direction of the wall portion 213. When the outer surface of the wall portion 213 is rectangular, the first direction can be the length direction or the width direction of the wall portion 213. When the outer surface of the wall portion 213 is circular, the first direction can be the radial direction of the wall portion 213. Please refer to Figure 8 , the first direction is the Y direction shown in the figure.

[0216] D represents the minimum diameter of the second terminal portion 222.

[0217] The L / D represents the ratio of the distance between the axis of the connecting portion 223 along the first direction and the axis of the second terminal portion 222 to the minimum diameter of the second terminal portion 222.

[0218] The ratio of the distance between the axis of the connecting portion 223 along the first direction and the axis of the second terminal portion 222 to the minimum diameter of the second terminal portion 222 can be: L / D = 0.1, 0.09, 0.08, 0.07, 0.06, 0.05, 0.04, 0.03, 0.02, 0.01, 0, etc.

[0219] It should be noted that when L / D = 0, the axis of the connecting portion 223 coincides with the axis of the second terminal portion 222.

[0220] When L / D ≤ 0.1, the axis of the connecting portion 223 and the axis of the second terminal portion 222 are substantially coincident, facilitating the combination of the first terminal portion 221 and the second terminal portion 222.

[0221] Optionally, the axis of the connecting portion 223 and the axis of the second terminal portion 222 are friction welded.

[0222] When the axis of the connecting portion 223 coincides with the axis of the second terminal portion 222, the friction welding of the first terminal portion 221 and the second terminal portion 222 is simpler and more convenient, and the quality of the friction welding is higher.

[0223] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 , in some embodiments, along the thickness direction of the wall portion 213, the second terminal portion 222 is disposed on the side of the first terminal portion 221 away from the inside of the housing 21.

[0224] Along the thickness direction of the wall portion 213, the first terminal portion 221 and the second terminal portion 222 are stacked, and the first terminal portion 221 is closer to the inside of the housing 21 than the second terminal portion 222. In other words, along the thickness direction of the wall portion 213, the first terminal portion 221 is disposed on the side of the second terminal portion 222 facing the inside of the housing 21.

[0225] The first terminal portion 221 is closer to the inside of the housing 21 than the second terminal portion 222, facilitating the welding of the first terminal portion 221 to the first electrode lead-out portion 242 and the welding of the second terminal portion 222 to the bus bar member.

[0226] In some embodiments, the battery cell 20 further includes a seal 27, and the seal 27 is at least partially disposed between the first terminal portion 221 and the wall portion 213.

[0227] The seal 27 is a structure capable of achieving a sealing effect, such as sealant, gasket, sealing sheet, or sealing ring, etc. The first terminal portion 221 and the wall portion 213 are sealed by the seal 27 to reduce the risk of electrolyte ingress into the composite interface.

[0228] The seal 27 seals the first terminal portion 221 and the wall portion 213, which can reduce the risk of metal corrosion caused by electrolyte ingress between the first terminal portion 221 and the second terminal portion 222.

[0229] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 In some embodiments, on the side of the first terminal portion 221 facing away from the inside of the housing 21, a first groove 2211 is provided, and at least a part of the second terminal portion 222 is received in the first groove 2211. Along the thickness direction of the wall portion 213, the bottom surface of the first groove 2211 is the third surface 22111, and the second terminal portion 222 has a fourth surface 2224 facing the first terminal portion 221, and the third surface 22111 and the fourth surface 2224 are connected. The seal 27 is provided between the side wall 22112 of the first groove 2211 and the wall portion 213.

[0230] Along the thickness direction of the wall portion 213, on the side of the first terminal portion 221 facing away from the inside of the housing 21, a first groove 2211 is provided, and the second terminal portion 222 is partially or fully received in the first groove 2211.

[0231] The bottom surface of the first groove 2211 and the fourth surface 2224 of the second terminal portion 222 facing the first terminal portion 221 are connected to form a connection interface.

[0232] The first groove 2211 further has a side wall 22112, and the side wall 22112 is disposed around the bottom wall of the groove and protrudes from the bottom wall in a direction away from the inside of the housing 21.

[0233] The seal 27 is provided between the side wall 22112 of the first groove 2211 and the wall portion 213 to seal the first terminal portion 221 and the wall portion 213.

[0234] By providing the first groove 2211 on the first terminal portion 221 and allowing at least a part of the second terminal portion 222 to be received in the first groove 2211, the first groove 2211 can play a positioning role, thus facilitating the connection of the first terminal portion 221 and the second terminal portion 222. In addition, the seal 27 is provided between the side wall 22112 of the first groove 2211 and the wall portion 213, making it more difficult for the electrolyte to ingress into the connection interface formed by the connection of the third surface 22111 and the fourth surface 2224, further reducing the risk of metal corrosion caused by electrolyte ingress into the connection interface.

[0235] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 ,in some embodiments, the wall portion 213 is provided with a lead-out hole 2131, and the seal 27 is at least partially located within the lead-out hole 2131. The battery cell 20 includes a first insulating member 25 disposed on the side of the wall portion 213 facing the interior of the housing 21, and the first insulating member 25 abuts against the seal 27. And / or the battery cell 20 includes a second insulating member 26, and the second insulating member 26 is at least partially disposed between the first electrode terminal 22 and the wall portion 213, and the second insulating member 26 abuts against the seal 27.

[0236] The lead-out hole 2131 is a hole portion 2222 formed in the wall portion 213. The lead-out hole 2131 is used for disposing the first electrode terminal 22, and the first electrode terminal 22 is connected to the electrode assembly 24 located inside the housing 21 and the bus bar member located outside the housing 21 through the lead-out hole 2131.

[0237] The first insulating member 25 is commonly referred to as the lower plastic. Along the thickness direction of the wall portion 213, the first insulating member 25 is disposed on the side of the wall portion 213 facing the interior of the housing 21, and the first insulating member 25 is used for insulating and isolating the electrical connection components inside the housing 211 and the wall portion 213 to reduce the risk of short circuit. Exemplarily, the first insulating member 25 can be plastic, rubber, etc. The first insulating member 25 abuts against the side of the seal 27 facing the interior of the housing 21 to limit the seal 27 from disengaging from the lead-out hole 2131 in the direction facing the interior of the housing 21.

[0238] The second insulating member 26 is commonly referred to as the upper plastic. The second insulating member 26 is partially or entirely disposed between the first electrode terminal 22 and the wall portion 213 to insulate and isolate the first electrode terminal 22 and the wall portion 213. Exemplarily, the second insulating member 26 can be plastic, rubber, etc. The second insulating member 26 abuts against the side of the seal 27 facing away from the interior of the housing 21 to limit the seal 27 from disengaging from the lead-out hole 2131 in the direction facing away from the interior of the housing 21.

[0239] By providing the first insulating member 25, the first insulating member 25 can insulate and isolate the wall portion 213 and the electrode assembly 24, reducing the risk of short - circuit caused by contact between the wall portion 213 and the electrode assembly 24. The second insulating member 26 can insulate and isolate the first electrode terminal 22 and the wall portion 213, reducing the risk of short - circuit caused by contact between the first electrode terminal 22 and the wall portion 213. Additionally, the first insulating member 25 and the second insulating member 26 respectively abut against both sides of the seal member 27 in the thickness direction of the wall portion 213, which can limit the position of the seal member 27, hold the seal member 27 within the lead - out hole 2131, and enable the seal member 27 to stably seal the first terminal portion 221 and the wall portion 213, further reducing the risk of electrolyte infiltrating into the composite interface of the first terminal portion 221 and the second terminal portion 222, resulting in metal corrosion.

[0240] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 , in some embodiments, in the thickness direction of the wall portion 213, a portion of the first insulating member 25 is clamped between the first terminal portion 221 and the wall portion 213.

[0241] In the thickness direction of the wall portion 213, a part of the first insulating member 25 is located between the first terminal portion 221 and the wall portion 213 and abuts against the first terminal portion 221 and the wall portion 213. In other words, the first terminal portion 221 and the wall portion 213 cooperate to clamp a part of the first wall portion 213 in the thickness direction of the wall portion 213.

[0242] By having a portion of the first insulating member 25 clamped between the first terminal portion 221 and the wall portion 213, the first terminal portion 221 and the wall portion 213 cooperate to limit the position of the first insulating member 25, enabling the first insulating member 25 to stably abut against the seal member 27, and allowing the seal member 27 to stably seal the first terminal portion 221 and the wall portion 213.

[0243] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 , in some embodiments, on the surface of the wall portion 213 facing the interior of the housing 21, a second groove 2132 is provided, and the lead - out hole 2131 communicates with the second groove 2132. The first insulating member 25 includes an insulating portion 251 received in the second groove 2132, and the insulating portion 251 is clamped between the first terminal portion 221 and the wall portion 213.

[0244] The wall portion 213 has an inner surface facing the interior of the housing 21. The inner surface is provided with a second groove 2132, and the second groove 2132 communicates with the lead - out hole 2131.

[0245] The insulating portion 251 is the part of the first insulating member 25 that is received in the second groove 2132. The first terminal portion 221 and the wall portion 213 cooperate to clamp the insulating portion 251. In other words, the part of the first insulating member 25 that is clamped by the first terminal portion 221 and the wall portion 213 is received in the second groove 2132.

[0246] By receiving the insulating portion 251 in the second groove 2132 and clamping the insulating portion 251 by the first terminal portion 221 and the wall portion 213, the occupation of the internal space of the battery cell 20 by the insulating portion 251 can be reduced, which is beneficial to improving the energy density of the battery cell 20.

[0247] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 , in some embodiments, the second insulating member 26 is disposed around the second terminal portion 222, a third groove 2221 is provided on the outer peripheral surface of the second terminal portion 222, and the second insulating member 26 is partially received in the third groove 2221.

[0248] The second insulating member 26 is disposed around the outside of the second terminal portion 222. A third groove 2221 is provided on the outer peripheral surface of the second terminal portion 222, and the third groove 2221 may be an annular groove extending along the circumferential direction of the second terminal portion 222.

[0249] In other embodiments, a plurality of third grooves 2221 are provided on the outer peripheral surface of the second terminal portion 222, and the plurality of third grooves 2221 are spaced apart along the circumferential direction of the second terminal portion 222.

[0250] The second insulating member 26 is partially received in the third groove 2221 to be in limiting cooperation with the third groove 2221.

[0251] By providing the third groove 2221 on the outer peripheral surface of the second terminal portion 222 and partially receiving the second insulating member 26 in the third groove 2221, the second insulating member 26 can play a role in limiting the second terminal portion 222 in the radial direction of the lead-out hole 2131.

[0252] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 , in some embodiments, a limiting protrusion 2133 is provided on the surface of the wall portion 213 facing away from the inside of the housing 21, the second insulating member 26 is provided with a fourth groove 2223, and the limiting protrusion 2133 is at least partially received in the fourth groove 2223.

[0253] The wall portion 213 has an outer surface that faces away from the interior of the housing 21 in the thickness direction of the wall portion 213. The limiting protrusion 2133 is a protrusion structure protruding from the outer surface. In some embodiments, the limiting protrusion 2133 is an annular structure, and the limiting protrusion 2133 is disposed around the outside of the lead-out hole 2131. In other embodiments, a plurality of limiting protrusions 2133 are provided on the outer surface, and the plurality of limiting protrusions 2133 are arranged along the circumferential direction of the lead-out hole 2131.

[0254] The second insulating member 26 is provided with a fourth groove 2223 for limiting cooperation with the limiting protrusion 2133.

[0255] By providing the limiting protrusion 2133 on the surface of the wall portion 213 facing away from the interior of the housing 21 and providing the fourth groove 2223 in the second insulating member 26 to cooperate with the limiting protrusion 2133, a better limiting effect can be achieved on the second insulating member 26.

[0256] In some embodiments, the second insulating member 26 is an injection molded part injection molded between the wall portion 213 and the first electrode terminal 22.

[0257] During manufacturing, the relative positions of the wall portion 213 and the first electrode terminal 22 can be fixed by a jig first, and then the second insulating member 26 is injection molded between the wall portion 213 and the first electrode terminal 22.

[0258] By injection molding the second insulating member 26 between the wall portion 213 and the first electrode terminal 22, the second insulating member 26 can limit the first electrode terminal 22 and enhance the connection strength between the first electrode terminal 22 and the wall portion 213.

[0259] Please refer to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 , in some embodiments, the wall portion 213 is provided with a lead-out hole 2131, and at least part of the first terminal portion 221 and / or the second terminal portion 222 is received in the lead-out hole 2131.

[0260] "At least part of the first terminal portion 221 and / or the second terminal portion 222 is received in the lead-out hole 2131" may be that at least part of the first terminal portion 221 is received in the lead-out hole 2131 and at least part of the second terminal portion 222 is received in the lead-out hole 2131, or it may be that at least part of the first terminal portion 221 is received in the lead-out hole 2131 and the second terminal portion 222 is located outside the lead-out hole 2131, or it may be that at least part of the second terminal portion 222 is received in the lead-out hole 2131 and the first terminal portion 221 is located outside the lead-out hole 2131.

[0261] By at least partially accommodating the first terminal portion 221 and / or the second terminal portion 222 in the lead-out hole 2131, the occupation of the internal space of the battery cell 20 or the internal space of the battery 100 by the first terminal portion 221 and / or the second terminal portion 222 can be reduced, which is beneficial to improving the energy density of the battery cell 20 or the battery 100.

[0262] Optionally, a part of the first terminal portion 221 is accommodated in the lead-out hole 2131, and another part of the first terminal portion 221 protrudes from the surface of the wall portion 213 facing the inside of the housing 21 in the direction facing the inside of the housing 21. And / or a part of the second terminal portion 222 is accommodated in the lead-out hole 2131, and another part of the second terminal portion 222 protrudes from the surface of the wall portion 213 facing away from the inside of the housing 21 in the direction away from the inside of the housing 21.

[0263] In the thickness direction of the wall portion 213, a part of the first terminal portion 221 is located in the lead-out hole 2131, and another part of the first terminal portion 221 extends out of the lead-out hole 2131 in the direction facing the inside of the housing 21.

[0264] In the thickness direction of the wall portion 213, a part of the second terminal portion 222 is located in the lead-out hole 2131, and another part of the second terminal portion 222 extends out of the lead-out hole 2131 in the direction away from the inside of the housing 21.

[0265] A part of the first terminal portion 221 being accommodated in the lead-out hole 2131 can reduce the occupation of the internal space of the battery cell 20 and improve the energy density of the battery cell 20. Another part of the first terminal portion 221 protrudes from the surface of the wall portion 213 facing the inside of the housing 21, thereby facilitating the welding of the first terminal portion 221 to the first electrode lead-out portion 242. A part of the second terminal portion 222 being accommodated in the lead-out hole 2131 can reduce the occupation of the internal space of the battery 100 and improve the energy density of the battery 100. Another part of the second terminal portion 222 protrudes from the surface of the wall portion 213 facing away from the inside of the housing 21, thereby facilitating the welding of the second terminal portion 222 to the bus bar component.

[0266] In some embodiments, the battery cell 20 further includes a second electrode terminal 23, and the second electrode terminal 23 is insulatingly mounted on the wall portion 213. The electrode assembly 24 further has a second electrode lead-out portion 243, and the second electrode terminal 23 is electrically connected to the second electrode lead-out portion 243.

[0267] The second electrode lead-out portion 243 is a structure for leading out the electrical energy of the main body portion 241 or introducing electrical energy into the main body portion 241. The second electrode lead-out portion 243 includes a second tab 2431. The second tab 2431 may include the above-mentioned positive tab or negative tab, and the second tab 2431 may be directly connected to the second electrode terminal 23. In some embodiments, the second electrode lead-out portion 243 may further include other electrical connection components connected to the second tab 2431. For example, the second electrode lead-out portion 243 may further include a second current collector member 2432. The second current collector member 2432 connects the second tab 2431 and the second electrode terminal 23 to direct the electrical energy of the electrode assembly 24 to the second electrode terminal 23 or receive the electrical energy introduced from the second electrode terminal 23.

[0268] The polarities of the first tab 2421 and the second tab 2431 are opposite. For example, when the first tab 2421 is a negative tab, the second tab 2431 is a positive tab. When the first tab 2421 is a positive tab, the second tab 2431 is a negative tab. Similarly, the polarities of the first electrode terminal 22 and the second electrode terminal 23 are opposite. For example, when the first electrode terminal 22 is a negative electrode terminal, the second electrode terminal 23 is a positive electrode terminal. When the first electrode terminal 22 is a positive electrode terminal, the second electrode terminal 23 is a negative electrode terminal.

[0269] The second electrode terminal 23 is insulatingly mounted on the wall portion 213, that is, the second electrode terminal 23 is insulated from the wall portion 213. Optionally, the battery cell 20 includes a third insulating member disposed between the second electrode terminal 23 and the wall portion 213 to insulate the second electrode terminal 23 from the wall portion 213.

[0270] The structure of the second electrode terminal 23 may be the same as or different from the structure of the first electrode terminal 22.

[0271] Optionally, the first electrode terminal 22 is a negative electrode terminal and the second electrode terminal 23 is a positive electrode terminal. The material of the second electrode terminal 23 is aluminum.

[0272] Please refer to Figure 13 and Figure 14 , Figure 13 which is a schematic block diagram of a method for manufacturing the battery cell 20 provided in some embodiments of the present application. Figure 14 which is a schematic block diagram of a method for manufacturing the battery cell 20 provided in other embodiments of the present application. The embodiments of the present application also provide a method for manufacturing a battery cell 20. The method for manufacturing a battery cell 20 includes:

[0273] Step S100: Manufacturing the first electrode terminal 22;

[0274] Step S200: Provide a housing 21 having a wall portion 213;

[0275] Step S300: Mount the first electrode terminal 22 on the wall portion 213;

[0276] Among them, step S100 includes:

[0277] Step S110: Provide a first terminal portion 221 and a second terminal portion 222. The first terminal portion 221 is provided with a connecting portion 223, and the second terminal portion 222 is provided with a hole portion 2222;

[0278] Step S120: Insert the connecting portion 223 into the hole portion 2222;

[0279] Step S130: Fix the connecting portion 223 and the second terminal portion 222 in a connected manner.

[0280] Please refer to Figure 15 , Figure 15 , which is a schematic block diagram of a method for manufacturing the battery cell 20 provided in some other embodiments of the present application. In some other embodiments, after step S120, the method for manufacturing the battery cell 20 further includes:

[0281] Step S121: Connect the first terminal portion 221 and the second terminal portion 222.

[0282] The connection between the first terminal portion 221 and the second terminal portion 222 can be carried out by means of a solid-liquid combination method, a solid-phase combination method, a laminated plate hot rolling method, a diffusion pressure welding method, a surfacing method, a surfacing hot rolling method, etc.

[0283] On the basis of fixedly connecting the connecting portion 223 and the second terminal portion 222, and then connecting the first terminal portion 221 and the second terminal portion 222 is beneficial to further improve the connection strength between the first terminal portion 221 and the second terminal portion 222, further reduce the risk of separation between the first terminal portion 221 and the second terminal portion 222, and is beneficial to improving the reliability of the battery cell 20.

[0284] Please refer to Figure 16 , Figure 16 , which is a schematic block diagram of a method for manufacturing the battery cell 20 provided in some other embodiments of the present application. In some embodiments, step S121 includes:

[0285] Step S1211: Friction-weld the first terminal portion 221 and the second terminal portion 222.

[0286] The connection between the first terminal portion 221 and the second terminal portion 222 is achieved by friction welding, with stable welding quality. The connection strength between the first terminal portion 221 and the second terminal portion 222 after welding is relatively high, which is conducive to reducing the risk of separation between the first terminal portion 221 and the second terminal portion 222 and improving the reliability of the battery cell 20.

[0287] Please refer to Figure 17 、 Figure 18 and Figure 19 , Figure 17 which is a schematic block diagram of the manufacturing method of the battery cell 20 provided by some other embodiments of the present application. Figure 18 which is a cross-sectional view before riveting the connecting portion 223 and the second terminal portion 222 provided by some embodiments of the present application. Figure 19 which is a cross-sectional view after riveting the connecting portion 223 and the second terminal portion 222 provided by some embodiments of the present application. In some embodiments, step S130 includes:

[0288] Step S131: Rivet and connect the connecting portion 223 with the second terminal portion 222.

[0289] Please refer to Figure 18 , before riveting the connecting portion 223, the connecting portion 223 is a columnar structure and the connecting portion 223 passes through the hole portion 2222.

[0290] Please refer to Figure 19 , after riveting the connecting portion 223, the connecting portion 223 includes a connecting body 2231 and a limiting body 2232, and at least part of the connecting body 2231 is received in the hole portion 2222. Along the thickness direction of the wall portion 213, the first terminal portion 221 and the limiting body 2232 are respectively connected to both ends of the connecting body 2231, and at least part of the second terminal portion 222 is clamped between the first terminal portion 221 and the limiting body 2232.

[0291] The fixation between the connecting portion 223 and the second terminal portion 222 is achieved by riveting and connecting the connecting portion 223 with the second terminal portion 222, so that the first terminal portion 221 and the second terminal portion 222 have relatively high connection strength, reducing the risk of separation between the first terminal portion 221 and the second terminal portion 222 and being conducive to improving the reliability of the battery cell 20.

[0292] Please refer to Figure 20 、 Figure 21 and Figure 22 , Figure 20 which is a schematic block diagram of the manufacturing method of the battery cell 20 provided by some other embodiments of the present application. Figure 21 which is a cross-sectional view before friction welding of the first terminal portion 221 and the second terminal portion 222 provided by some embodiments of the present application. Figure 22A cross-sectional view after friction welding of the first terminal portion 221 and the second terminal portion 222 provided in some embodiments of the present application. In some other embodiments, the connecting portion 223 includes a connecting body 2231 and a limiting body 2232, and the first terminal portion 221 and the limiting body 2232 are respectively connected to two ends of the connecting body 2231. Step S130 includes:

[0293] Step S132: Friction-weld the first terminal portion 221 and the second terminal portion 222 so that a part of the second terminal portion 222 is extruded between the first terminal portion 221 and the limiting body 2232, so that a part of the second terminal portion 222 is clamped between the first terminal portion 221 and the limiting body 2232.

[0294] Please refer to Figure 21 , before friction-welding the first terminal portion 221 and the second terminal portion 222, first insert the connecting portion 223 into the hole portion 2222. At this time, the connecting portion 223 includes a connecting body 2231 and a limiting body 2232, and at least a part of the connecting body 2231 is received in the hole portion 2222. Along the thickness direction of the wall portion 213, the first terminal portion 221 and the limiting body 2232 are respectively connected to two ends of the connecting body 2231. To facilitate the insertion of the connecting portion 223, the minimum diameter of the hole portion 2222 is greater than the maximum diameter of the connecting portion 223. In an embodiment where the hole portion 2222 includes a first hole section 22221 and a second hole section 22222, the diameter of the first hole section 22221 is greater than the diameter of the limiting body 2232.

[0295] Please refer to Figure 22 , when friction-welding the first terminal portion 221 and the second terminal portion 222, a part of the second terminal portion 222 is extruded between the first terminal portion 221 and the limiting body 2232, so that the diameter of the first hole section 22221 gradually becomes smaller, and finally the diameter of the first hole section 22221 is smaller than the diameter of the limiting body 2232, so that a part of the second terminal portion 222 is clamped between the first terminal portion 221 and the limiting body 2232.

[0296] The connecting portion 223 is prefabricated into a structure having a connecting body 2231 and a limiting body 2232, and the connecting portion 223 is received in the hole portion 2222. During the process of friction-welding the first terminal portion 221 and the second terminal portion 222, a part of the second terminal portion 222 is extruded between the first terminal portion 221 and the limiting body 2232, so that the second terminal portion 222 can be clamped between the first terminal portion 221 and the limiting body 2232, that is, the fixed connection between the connecting portion 223 and the second terminal portion 222 is realized, and the friction welding between the first terminal portion 221 and the second terminal portion 222 is realized, so that the first terminal portion 221 and the second terminal portion 222 have a high connection strength, reduce the risk of separation between the first terminal portion 221 and the second terminal portion 222, and are beneficial to improving the reliability of the battery cell 20.

[0297] Please refer to Figure 23 and Figure 24 , Figure 23 which is a schematic block diagram of the manufacturing method of the battery cell 20 provided for some other embodiments of the present application. Figure 24 which is a cross-sectional view of the first electrode terminal 22 provided for some other embodiments of the present application. In some other embodiments, step S130 includes:

[0298] Step S133: Connect the circumferential surface of the connecting portion 223 to the hole wall surface of the hole portion 2222.

[0299] In some embodiments, the circumferential surface of the connecting portion 223 is connected to the hole wall surface of the hole portion 2222 by welding.

[0300] In some other embodiments, the circumferential surface of the connecting portion 223 is connected to the hole wall surface of the hole portion 2222 by welding and bonding.

[0301] When the circumferential surface of the connecting portion 223 is connected to the hole wall surface of the hole portion 2222, the connecting portion 223 and the second terminal portion 222 have a relatively large connecting surface, which is beneficial to making the first terminal portion 221 and the second terminal portion 222 have a relatively high connecting strength, reducing the risk of separation between the first terminal portion 221 and the second terminal portion 222, and being beneficial to improving the reliability of the battery cell 20.

[0302] Please refer to Figure 25 , Figure 25 which is a schematic block diagram of the manufacturing method of the battery cell 20 provided for some other embodiments of the present application. In some other embodiments, the wall portion 213 is provided with a lead-out hole 2131.

[0303] Step S300 includes:

[0304] Step S310: Sheath a sealing member 27 outside the first terminal portion 221;

[0305] Step S320: Dispose a first insulating member 25 on the side of the wall portion 213 facing the inside of the housing 21;

[0306] Step S330: Insert the first electrode terminal 22 into the lead-out hole 2131, and make the first terminal portion 221 press a part of the first insulating member 25 against the wall portion 213;

[0307] Step S340: Injection mold a second insulating member 26 between the second terminal portion 222 and the wall portion 213, such that the first insulating member 25 and the second insulating member 26 respectively abut against both sides of the sealing member 27.

[0308] By providing the first insulating member 25, the first insulating member 25 can insulate and isolate the wall portion 213 and the electrode assembly 24, reducing the risk of short circuit caused by the contact between the wall portion 213 and the electrode assembly 24. The second insulating member 26 can insulate and isolate the first electrode terminal 22 and the wall portion 213, reducing the risk of short circuit caused by the contact between the first electrode terminal 22 and the wall portion 213. In addition, the first insulating member 25 and the second insulating member 26 respectively abut against both sides of the seal member 27 in the thickness direction of the wall portion 213, which can limit the position of the seal member 27, hold the seal member 27 in the lead-out hole 2131, and enable the seal member 27 to stably seal the first terminal portion 221 and the wall portion 213, further reducing the risk of metal corrosion caused by the electrolyte infiltrating into the composite interface of the first terminal portion 221 and the second terminal portion 222.

[0309] An embodiment of the present application further provides a battery 100, and the battery 100 includes the above-mentioned battery cell 20.

[0310] An embodiment of the present application further provides an electrical device, and the electrical device includes the above-mentioned battery cell 20, and the battery cell 20 is used to provide electrical energy for the electrical device.

[0311] According to some embodiments of the present application, please refer to Figures 3 to 10 .

[0312] An embodiment of the present application provides a battery cell 20, and the battery cell 20 includes a housing 21 and a first electrode terminal 22. The housing 21 has a wall portion 213, and the first electrode terminal 22 is disposed on the wall portion 213. The first electrode terminal 22 includes a first terminal portion 221 and a second terminal portion 222, and the first terminal portion 221 and the second terminal portion 222 are made of different materials and are compounded with each other. Among them, the first terminal portion 221 is provided with a connecting portion 223, and the connecting portion 223 is riveted to the second terminal portion 222. The first terminal portion 221 and the second terminal portion 222 of the first electrode terminal 22 are made of different materials and are compounded with each other, so as to facilitate welding of one of the first terminal portion 221 and the second terminal portion 222 to the first electrode lead-out portion 242, and welding of the other of the first terminal portion 221 and the second terminal portion 222 to the bus bar component. In addition, the first terminal portion 221 is further provided with a connecting portion 223, and the connecting portion 223 is riveted to the second terminal portion 222, further increasing the connection strength between the first terminal portion 221 and the second terminal portion 222, reducing the risk of separation between the first terminal portion 221 and the second terminal portion 222, and being beneficial to improving the reliability of the battery cell 20.

[0313] The first terminal portion 221 has a third surface 22111 facing the second terminal portion 222, and the second terminal portion 222 has a fourth surface 2224 facing the first terminal portion 221, and the third surface 22111 and the fourth surface 2224 are composited with each other. The connecting portion 223 is arranged on the third surface 22111, and the second terminal portion 222 is provided with a hole portion 2222, and the hole portion 2222 penetrates the fourth surface 2224, and the connecting portion 223 is at least partially accommodated in the hole portion 2222. By arranging the connecting portion 223 on the third surface 22111 and making the connecting portion 223 at least partially accommodated in the hole portion 2222, the riveting of the connecting portion 223 and the second terminal portion 222 is achieved, and the external force provided by the riveting is conducive to keeping the composite interface formed by the third surface 22111 and the fourth surface 2224 in close connection, reducing the risk of loosening of the composite interface, and is conducive to reducing the internal resistance of the first electrode terminal 22, and improving the reliability of the battery cell 20.

[0314] The first terminal portion 221 and the second terminal portion 222 are stacked along the thickness direction of the wall portion 213; the third surface 22111 faces the second terminal portion 222 along the thickness direction of the wall portion 213, and the fourth surface 2224 faces the first terminal portion 221 along the thickness direction of the wall portion 213. By stacking the first terminal portion 221 and the second terminal portion 222 along the thickness direction of the wall portion 213, it is not only convenient for the one of the first terminal portion 221 and the second terminal portion 222 facing the first electrode lead-out portion 242 to be welded to the first electrode lead-out portion 242, and the one of the first terminal portion 221 and the second terminal portion 222 facing away from the first electrode lead-out portion 242 to be welded to the converging component, but also helps to make the welding area larger, improve the welding strength and obtain a larger flow area. In addition, the third surface 22111 faces the second terminal portion 222 along the thickness direction of the wall portion 213, and the fourth surface 2224 faces the first terminal portion 221 along the thickness direction of the wall portion 213. The composite interface formed by the third surface 22111 and the fourth surface 2224 is roughly perpendicular to the thickness direction of the wall portion 213, so that the electrolyte needs to completely submerge one of the first terminal portion 221 and the second terminal portion 222 closer to the inside of the outer shell 21 before it can enter the composite interface, thereby reducing the risk of metal corrosion caused by the electrolyte penetrating the composite interface.

[0315] The first terminal portion 221 is provided with a first groove 2211, the second terminal portion 222 is at least partially received in the first groove 2211, and the groove bottom surface of the first groove 2211 is the third surface 22111. By providing the first groove 2211 on the first terminal portion 221 and allowing the second terminal portion 222 to be at least partially received in the first groove 2211, the first groove 2211 can play a positioning role, thus facilitating the combination of the first terminal portion 221 and the second terminal portion 222. In addition, since the groove bottom surface of the first groove 2211 is the third surface 22111, it is more difficult for the electrolyte to penetrate into the combined interface, further reducing the risk of metal corrosion caused by the electrolyte penetrating into the combined interface.

[0316] Along the thickness direction of the wall portion 213, the second terminal portion 222 is combined with the side of the first terminal portion 221 facing away from the interior of the housing 21. The battery cell 20 further includes a seal 27 configured to seal the first terminal portion 221 and the wall portion 213. The first terminal portion 221 is closer to the interior of the housing 21 than the second terminal portion 222, which facilitates the welding of the first terminal portion 221 to the first electrode lead-out portion 242 and the welding of the second terminal portion 222 to the bus bar component. The seal 27 seals the first terminal portion 221 and the wall portion 213, which can reduce the risk of metal corrosion caused by the electrolyte penetrating into the combined interface of the first terminal portion 221 and the second terminal portion 222.

[0317] A first groove 2211 is provided on the side of the first terminal portion 221 facing away from the interior of the housing 21, and the second terminal portion 222 is at least partially received in the first groove 2211. Along the thickness direction of the wall portion 213, the groove bottom surface of the first groove 2211 is the third surface 22111, and the second terminal portion 222 has a fourth surface 2224 facing the first terminal portion 221, and the third surface 22111 and the fourth surface 2224 are combined with each other. The seal 27 is provided between the groove side wall 22112 of the first groove 2211 and the wall portion 213. By providing the first groove 2211 on the first terminal portion 221 and allowing the second terminal portion 222 to be at least partially received in the first groove 2211, the first groove 2211 can play a positioning role, thus facilitating the combination of the first terminal portion 221 and the second terminal portion 222. In addition, since the seal 27 is provided between the groove side wall 22112 of the first groove 2211 and the wall portion 213, it is more difficult for the electrolyte to penetrate into the combined interface, further reducing the risk of metal corrosion caused by the electrolyte penetrating into the combined interface.

[0318] The wall portion 213 is provided with a lead-out hole 2131, and the seal 27 is at least partially located in the lead-out hole 2131; the battery cell 20 includes a first insulating member 25, and the first insulating member 25 is disposed on the side of the wall portion 213 facing the inside of the housing 21, and the first insulating member 25 abuts against the seal 27 to limit the seal 27 from detaching from the lead-out hole 2131 in the direction facing the inside of the housing 21. And / or the battery cell 20 includes a second insulating member 26, and the second insulating member 26 is at least partially disposed between the first electrode terminal 22 and the wall portion 213 to insulate and isolate the first electrode terminal 22 and the wall portion 213, and the second insulating member 26 abuts against the seal 27 to limit the seal 27 from detaching from the lead-out hole 2131 in the direction away from the inside of the housing 21. By providing the first insulating member 25, the first insulating member 25 can insulate and isolate the wall portion 213 and the electrode assembly 24, reducing the risk of short circuit caused by the contact between the wall portion 213 and the electrode assembly 24. The second insulating member 26 can insulate and isolate the first electrode terminal 22 and the wall portion 213, reducing the risk of short circuit caused by the contact between the first electrode terminal 22 and the wall portion 213. In addition, the first insulating member 25 and the second insulating member 26 respectively abut against both sides of the seal 27 in the thickness direction of the wall portion 213, which can play a limiting role on the seal 27, hold the seal 27 in the lead-out hole 2131, and enable the seal 27 to stably seal the first terminal portion 221 and the wall portion 213, further reducing the risk of metal corrosion caused by the electrolyte infiltrating into the composite interface of the first terminal portion 221 and the second terminal portion 222.

[0319] The foregoing are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that, Comprising: A housing having a wall portion; An electrode assembly disposed within the housing; A first electrode terminal disposed on the wall portion, the first electrode terminal including a first terminal portion and a second terminal portion, the first terminal portion and the second terminal portion being made of different materials, and the first terminal portion and the second terminal portion being stacked in the thickness direction of the wall portion; Wherein, a connecting portion is provided on the first terminal portion, a hole portion is provided on the second terminal portion, the connecting portion is at least partially disposed within the hole portion and is fixedly connected to the second terminal portion.

2. The battery cell according to claim 1, characterized in that, The connecting portion includes a connecting body and a limiting body, the connecting body is at least partially received within the hole portion, in the thickness direction of the wall portion, the first terminal portion and the limiting body are respectively connected to two ends of the connecting body, and at least a part of the second terminal portion is clamped between the first terminal portion and the limiting body.

3. The battery cell according to claim 2, wherein, The hole portion includes a first hole segment and a second hole segment arranged in the thickness direction of the wall portion, the aperture of the second hole segment is larger than that of the first hole segment, and the hole wall surface of the first hole segment and the hole wall surface of the second hole segment are connected by a stepped surface; The connecting body passes through the first hole segment, and the limiting body is at least partially located within the second hole segment and abuts against the stepped surface.

4. The battery cell according to claim 3, characterized in that, In the thickness direction of the wall portion, the second terminal portion has a first surface facing away from the first terminal portion, and the second hole segment extends to the first surface.

5. The battery cell according to claim 3, characterized in that, In the thickness direction of the wall portion, the second terminal portion has a first surface facing away from the first terminal portion, and there is a distance between the second hole segment and the first surface.

6. The battery cell according to claim 3, wherein, The limiting body is completely received within the second hole segment.

7. The battery cell according to claim 6, characterized in that, In the thickness direction of the wall portion, the second terminal portion has a first surface facing away from the first terminal portion, the limiting body has a second surface facing away from the connecting body, and the second surface is closer to the first terminal portion than the first surface.

8. The battery cell according to claim 1, characterized in that, In the thickness direction of the wall portion, the second terminal portion has a first surface facing away from the first terminal portion, the connecting portion has a second surface facing away from the first terminal portion, and the second surface is closer to the first terminal portion than the first surface.

9. The battery cell according to claim 1, characterized in that, In the thickness direction of the wall portion, the first terminal portion has a third surface facing the second terminal portion, the second terminal portion has a fourth surface facing the first terminal portion, and the third surface and the fourth surface are connected; The connecting portion is disposed on the third surface, and the hole portion penetrates the fourth surface.

10. The battery cell according to claim 9, characterized in that, The first terminal portion is provided with a first groove, at least a part of the second terminal portion is received within the first groove, and the groove bottom surface of the first groove is the third surface.

11. The battery cell according to claim 1, wherein The peripheral surface of the connecting portion is connected to the hole wall surface of the hole portion.

12. The battery cell according to any one of claims 1-11, characterized in that, The first terminal portion and the second terminal portion are friction welded.

13. The battery cell according to claim 12, wherein In a first direction, the distance between the axis of the connecting portion and the axis of the second terminal portion is L, and the minimum diameter of the second terminal portion is D, satisfying: L / D ≤ 0.1; The first direction is perpendicular to the thickness direction of the wall portion.

14. The battery cell according to claim 13, wherein The axis of the connecting portion coincides with the axis of the second terminal portion.

15. The battery cell according to any one of claims 1-11, characterized in that, In the thickness direction of the wall portion, the second terminal portion is disposed on a side of the first terminal portion facing away from the interior of the housing.

16. The battery cell according to claim 15, wherein The battery cell further includes a seal, and at least a part of the seal is disposed between the first terminal portion and the wall portion.

17. The battery cell according to claim 16, wherein A first groove is provided on a side of the first terminal portion facing away from the interior of the housing, and at least a part of the second terminal portion is received in the first groove. In the thickness direction of the wall portion, a bottom surface of the first groove is a third surface, and the second terminal portion has a fourth surface facing the first terminal portion, and the third surface and the fourth surface are connected. At least a part of the seal is disposed between a side wall of the first groove and the wall portion.

18. The battery cell according to claim 16, wherein, The wall portion is provided with a lead-out hole, and at least a part of the seal is located in the lead-out hole. The battery cell includes a first insulating member, and the first insulating member is disposed on a side of the wall portion facing the interior of the housing, and the first insulating member abuts against the seal; and / or The battery cell includes a second insulating member, and at least a part of the second insulating member is disposed between the first electrode terminal and the wall portion, and the second insulating member abuts against the seal.

19. The battery cell according to claim 18, wherein In the thickness direction of the wall portion, a part of the first insulating member is clamped between the first terminal portion and the wall portion.

20. The battery cell according to claim 19, wherein, A second groove is provided on a surface of the wall portion facing the interior of the housing, the lead-out hole communicates with the second groove, and the first insulating member includes an insulating portion received in the second groove, and the insulating portion is clamped between the first terminal portion and the wall portion.

21. The battery cell according to claim 18, wherein, The second insulating member is disposed around the second terminal portion, a third groove is provided on an outer peripheral surface of the second terminal portion, and a part of the second insulating member is received in the third groove.

22. The battery cell according to claim 18, wherein, A limiting protrusion is provided on a surface of the wall portion facing away from the interior of the housing, a fourth groove is provided on the second insulating member, and at least a part of the limiting protrusion is received in the fourth groove.

23. The battery cell according to claim 18, wherein, The second insulating member is an injection-molded part injection-molded between the wall portion and the first electrode terminal.

24. The battery cell according to any one of claims 1-11, characterized in that, The wall portion is provided with a lead-out hole, and at least a part of the first terminal portion and / or the second terminal portion is received in the lead-out hole.

25. The battery cell according to claim 24, wherein A part of the first terminal portion is received in the lead-out hole, and another part of the first terminal portion protrudes from a surface of the wall portion facing the interior of the housing in a direction facing the interior of the housing; and / or A part of the second terminal portion is received in the lead-out hole, and another part of the second terminal portion protrudes from a surface of the wall portion facing away from the interior of the housing in a direction facing away from the interior of the housing.

26. A battery, characterized in that, Comprising the battery cell according to any one of claims 1-25.

27. An electrical device, characterized in that, Comprising the battery cell according to any one of claims 1-25, the battery cell being configured to supply electrical energy to the electrical device.

Images