Battery monomer, battery and electric device

Abstract

The invention is applicable to the technical field of batteries, and provides a battery monomer, a battery and a power utilization device, the power utilization device comprises the battery, the battery comprises the battery monomer, and the battery monomer comprises a shell, an electrode assembly, an electrode terminal and a first insulating part. The shell is provided with a lead-out hole; the electrode assembly is arranged in the shell; the electrode terminal is arranged in the lead-out hole in a penetrating manner or is arranged opposite to the lead-out hole; the electrode terminal is connected to the shell and the electrode assembly and is provided with a limiting groove; the first insulating part comprises an insulating body and a limiting part connected to the insulating body, the insulating body is arranged between the shell and the electrode assembly, the limiting part is inserted into the limiting groove, and the limiting part and the limiting groove form limiting in the axial direction of the leading-out hole. The limiting piece of the first insulating piece is inserted into the limiting groove of the electrode terminal, so that the first insulating piece and the electrode terminal are limited in the axial direction, and the bonding strength of the electrode terminal and the shell can be improved. Therefore, the risk that the electrode terminal is separated from the shell is reduced, and the reliability of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and more particularly relates to a battery monomer, a battery and an electric device. BACKGROUND

[0002] In the related art, a battery monomer includes an electrode assembly, a shell and an electrode terminal. The electrode assembly is arranged in the shell. The electrode terminal is arranged on the shell and connected to the electrode assembly.

[0003] During the processes such as charge-discharge cycle and impact test of the battery monomer, the electrode terminal is subjected to extrusion and other actions generated in the expansion process of the electrode assembly, so that the electrode terminal is easily separated from the shell due to stress, resulting in the failure of the connection relationship between the electrode terminal and the electrode assembly. SUMMARY

[0004] In view of the above problems, the embodiments of the application provide a battery monomer, a battery and an electric device, which can improve the technical problem that the electrode terminal is easily separated from the shell.

[0005] In a first aspect, the embodiments of the application provide a battery monomer, comprising:

[0006] a shell provided with a lead-out hole;

[0007] an electrode assembly arranged in the shell;

[0008] an electrode terminal arranged in the lead-out hole or arranged opposite to the lead-out hole; the electrode terminal is connected to the shell and the electrode assembly, and provided with a limiting groove;

[0009] a first insulating member comprising an insulating body and a limiting member connected to the insulating body; the insulating body is arranged between the shell and the electrode assembly; the limiting member is inserted into the limiting groove and forms limiting in the axial direction of the lead-out hole with the limiting groove.

[0010] The battery monomer provided by the embodiments of the application has the insulating body of the first insulating member arranged between the shell and the electrode assembly, the limiting member of the first insulating member inserted into the limiting groove of the electrode terminal, and the limiting member limited in cooperation with the limiting groove along the axial direction of the electrode terminal, so that the first insulating member and the electrode terminal are limited in the axial direction, which makes the first insulating member and the electrode terminal have high bonding strength, and further improves the bonding strength of the electrode terminal and the shell. In this way, it is helpful to reduce the risk of the electrode terminal being separated from the shell and improve the reliability of the battery monomer.

[0011] In some embodiments, the electrode terminal comprises:

[0012] a terminal body connected to the shell and covering the lead-out hole;

[0013] The boss is arranged at one end of the terminal body close to the electrode assembly and is arranged in the lead-out hole; the boss is connected to the electrode assembly, and at least part of the limiting groove is arranged on the boss.

[0014] By arranging the boss on the electrode terminal and arranging at least part of the limiting groove on the boss, the boss can be close to the first insulating piece in the axial direction, which facilitates the limiting of the limiting piece and the limiting groove of the first insulating piece in the axial direction, thereby facilitating the improvement of the bonding strength of the first insulating piece and the electrode terminal, the improvement of the bonding strength of the electrode terminal and the shell, the reduction of the risk of the electrode terminal being pulled out of the shell, and the improvement of the reliability of the battery cell.

[0015] In some embodiments, the at least one limiting groove is a first limiting groove, the first limiting groove includes a first groove segment and a second groove segment connected to the first groove segment; the limiting piece includes a first limiting part and a second limiting part connected to the first limiting part, at least one of the first limiting part and the second limiting part is connected to the insulating body; the first limiting part is limited in the first groove segment in the axial direction, and the second limiting part is limited in the second groove segment in the radial direction of the lead-out hole.

[0016] By using the above technical solution, the limiting piece can be limited in the limiting groove in the axial direction and the radial direction, which can improve the limiting strength of the limiting piece on the electrode terminal, thereby improving the bonding strength of the first insulating piece and the electrode terminal, reducing the risk of the electrode terminal being pulled out of the first insulating piece, and further reducing the risk of the electrode terminal being pulled out of the shell and improving the reliability of the battery cell.

[0017] In some embodiments, in the axial direction, the second groove segment protrudes from at least one side of the first groove segment.

[0018] By making the second groove segment protrude from at least one side of the first groove segment in the axial direction, the second groove segment can be used to limit the second limiting part in the radial direction, thereby improving the bonding strength of the first insulating piece and the electrode terminal, further improving the bonding strength of the electrode terminal and the shell, reducing the risk of the electrode terminal being pulled out of the shell, and improving the reliability of the battery cell.

[0019] In some embodiments, the number of limiting grooves is a plurality, and the plurality of limiting grooves are distributed in the circumferential direction of the lead-out hole.

[0020] The first limiting part is limited in the first groove segment in the circumferential direction, and / or the second limiting part is limited in the second groove segment in the circumferential direction.

[0021] In this way, the bonding strength of the first insulating piece and the electrode terminal can be improved, the bonding strength of the electrode terminal and the shell can be improved, the risk of the electrode terminal being pulled out of the shell can be reduced, and the reliability of the battery cell can be improved.

[0022] In some embodiments, the second slot section protrudes from at least one side of the first slot section in the circumferential direction.

[0023] By having the second slot section protrude from at least one side of the first slot section in the circumferential direction, the second slot section can be used to limit the second limiting part in the radial direction, thereby improving the bonding strength between the first insulating member and the electrode terminal, helping to reduce the risk of the electrode terminal coming off the shell, and improving the reliability of the battery cell.

[0024] In some embodiments, the electrode terminal comprises a terminal body and a boss; the terminal body is connected to the shell and covers the lead-out hole; the boss is arranged at one end of the terminal body close to the electrode assembly and is arranged in the lead-out hole; the boss is connected to the electrode assembly, the first slot section is arranged on the outer peripheral wall of the boss, and at least part of the second slot section is arranged on the boss.

[0025] By using the above technical solution, at least part of the first insulating member can be arranged on the outer peripheral side of the boss, so that the first insulating member can not only realize the insulation between the shell and the electrode assembly, but also realize the insulation between the boss and the shell, helping to improve the reliability of the battery cell.

[0026] In some embodiments, the second limiting part is also limited in the second slot section in the axial direction.

[0027] In this way, the second limiting part is limited in the second slot section in the radial direction and the axial direction, respectively. In this way, the limiting strength of the limiting member and the limiting slot in the axial direction can be improved, thereby improving the bonding strength between the first insulating member and the electrode terminal, helping to reduce the risk of the electrode terminal coming off the shell, and improving the reliability of the battery cell.

[0028] In some embodiments, the first size of the boss = [1 / 3, 2 / 3] * the second size of the boss.

[0029] The first size is the distance between the slot wall of the second slot section close to the outer peripheral wall of the boss and the outer peripheral wall of the boss in the radial direction; and the second size is the distance between the slot wall of the second slot section away from the outer peripheral wall of the boss and the outer peripheral wall of the boss in the radial direction.

[0030] In this way, on the one hand, the limiting slot does not excessively occupy the volume of the boss, thereby being able to guarantee the structural strength and flow capacity of the boss to a certain extent. On the other hand, the stepped structure can realize relatively firm limiting of the second limiting part in the radial direction, thereby improving the limiting strength of the limiting member and the limiting slot in the radial direction, to improve the bonding strength between the first insulating member and the electrode terminal, helping to reduce the risk of the electrode terminal coming off the shell, and improving the reliability of the battery cell.

[0031] In some embodiments, the second slot section is arranged at one end of the electrode terminal close to the electrode assembly in the axial direction.

[0032] By adopting the technical scheme, the limiting piece and the limiting groove are facilitated to be inserted and matched.

[0033] In some embodiments, the first slot section and the second slot section are distributed along the axial direction, and the first limiting part is further limited in the first slot section along the radial direction.

[0034] In this way, the limiting strength of the limiting piece and the limiting groove in the axial direction is improved, so as to improve the combination strength of the first insulating piece and the electrode terminal, which helps to reduce the risk of the electrode terminal being pulled out of the shell and improve the reliability of the battery monomer.

[0035] In some embodiments, the third dimension = [1 / 3, 2 / 3] * the fourth dimension of the electrode terminal.

[0036] The third dimension is the distance between the slot wall close to the electrode assembly and the end of the electrode terminal close to the electrode assembly in the axial direction; and the fourth dimension is the distance between the slot wall away from the electrode assembly and the end of the electrode terminal close to the electrode assembly in the axial direction.

[0037] In this way, on the one hand, the limiting groove does not excessively occupy the volume of the electrode terminal, so as to ensure the structural strength and overcurrent capacity of the electrode terminal to a certain extent. On the other hand, the stepped structure can achieve a relatively firm limiting effect on the first limiting part in the axial direction, so as to improve the limiting strength of the limiting piece and the limiting groove in the radial and axial directions, to improve the combination strength of the first insulating piece and the electrode terminal, which helps to reduce the risk of the electrode terminal being pulled out of the shell and improve the reliability of the battery monomer.

[0038] In some embodiments, the at least one limiting groove is a second limiting groove, and the second limiting groove is arranged on the outer peripheral wall of the boss. In the radial direction of the lead-out hole, the cross-sectional area of the second limiting groove perpendicular to the radial direction is gradually reduced towards the outer peripheral wall of the boss.

[0039] In this way, the slot wall of the second limiting groove can achieve radial limiting on the limiting piece. In this way, the first limiting groove and the limiting piece can not only achieve limiting in the axial direction, but also achieve limiting in the radial direction. This helps to improve the combination strength between the electrode terminal and the first insulating piece, to improve the combination strength of the first insulating piece and the electrode terminal, which helps to reduce the risk of the electrode terminal being pulled out of the shell and improve the reliability of the battery monomer.

[0040] In some embodiments, the axial dimension of the second limiting groove is gradually reduced towards the outer peripheral wall of the boss along the radial direction.

[0041] And / or, the number of the second limiting grooves is a plurality, and the plurality of second limiting grooves are distributed along the circumferential direction of the lead-out hole, and the circumferential dimension of the second limiting groove is gradually reduced towards the outer peripheral wall of the boss along the radial direction.

[0042] By adopting the technical scheme, the cross-sectional area of the second limiting groove perpendicular to the radial direction can be gradually reduced in the direction of the outer peripheral wall of the boss, so that the groove wall of the second limiting groove can realize radial limiting on the limiting member.

[0043] In some embodiments, the two axially opposite groove walls of the second limiting groove are gradually tapered in the radial direction towards the outer peripheral wall of the boss.

[0044] In some embodiments, the number of the second limiting grooves is multiple, the multiple second limiting grooves are distributed at intervals in the circumferential direction of the lead-out hole, and the two circumferentially opposite groove walls of the second limiting groove are gradually tapered in the radial direction towards the outer peripheral wall of the boss.

[0045] By adopting the technical scheme, the limiting strength of the second limiting groove on the limiting member in the radial direction can be improved, so as to improve the bonding strength between the electrode terminal and the first insulating member, and reduce the risk of the electrode terminal being pulled out of the shell.

[0046] In some embodiments, the fifth dimension of the second limiting groove = [0.6, 0.9] * the sixth dimension of the second limiting groove.

[0047] The fifth dimension is the axial dimension of the second limiting groove at one end of the outer peripheral wall of the boss, and the sixth dimension is the axial dimension of the second limiting groove away from one end of the outer peripheral wall of the boss in the radial direction.

[0048] In this way, the limiting member can be effectively limited in the radial direction in the second limiting groove. Moreover, the narrowing of the second limiting groove at the outer peripheral wall of the boss is not too small, so as to facilitate the limiting member to enter the second limiting groove.

[0049] In some embodiments, the seventh dimension of the second limiting groove = [0.6, 0.9] * the eighth dimension of the second limiting groove.

[0050] The seventh dimension is the circumferential dimension of the second limiting groove at one end of the outer peripheral wall of the boss, and the eighth dimension is the circumferential dimension of the second limiting groove away from one end of the outer peripheral wall of the boss in the radial direction.

[0051] In this way, the limiting member can be effectively limited in the radial direction in the second limiting groove. Moreover, the narrowing of the second limiting groove at the outer peripheral wall of the boss is not too small, so as to facilitate the limiting member to enter the second limiting groove.

[0052] In some embodiments, the electrode terminal includes a positive electrode terminal, the limiting groove of the positive electrode terminal is arranged on the boss, and the axial dimension of the limiting groove of the positive electrode terminal = [1 / 3, 2 / 3] * the axial dimension of the boss.

[0053] In this way, the limiting groove occupies a proper size ratio of the boss of the positive electrode terminal in the axial direction, so that the limiting groove can effectively limit the limiting member, and the structural strength and flow capacity of the boss can be ensured to a certain extent.

[0054] In some embodiments, the electrode terminal includes a negative electrode terminal, and the negative electrode terminal further includes a composite layer, the material of the composite layer is different from that of the terminal body and the same as that of the boss; the composite layer is arranged between the terminal body and the boss, the radial dimension of the composite layer is greater than that of the boss, and the composite layer covers the lead-out hole.

[0055] On the one hand, the composite strength between the outer pole and the inner pole can be improved, and the risk of the terminal body being pulled out of the shell can be reduced. On the other hand, the composite layer covers the lead-out hole, so that the sealing ring can be sealed between the composite layer and the shell in the axial direction on the basis of sealing the connection between the negative electrode terminal and the shell by the sealing ring. In this way, the problem that the electrolyte in the shell destroys the composite interface between the composite layer and the terminal body can be effectively improved, and the structural strength of the electrode terminal can be ensured to a certain extent.

[0056] In some embodiments, the axial dimension of the limiting groove of the negative electrode terminal = [1 / 3, 2 / 3] * the sum of the axial dimensions of the boss and the composite layer.

[0057] In this way, the limiting groove occupies a proper size ratio of the boss and the composite layer of the negative electrode terminal in the axial direction, so that the limiting groove can effectively limit the limiting member, and the structural strength and flow capacity of the boss and the composite layer can be ensured to a certain extent.

[0058] In some embodiments, the electrode terminal is provided with a welding portion at one end close to the electrode assembly;

[0059] In the radial direction of the lead-out hole, the groove wall of the limiting groove protrudes away from the outer peripheral wall of the electrode terminal or is flush with the welding portion; or in the radial direction of the lead-out hole, the welding portion protrudes from the groove wall of the limiting groove away from the outer peripheral wall of the electrode terminal, and in the axial direction, the distance between the groove wall close to the welding portion and the welding portion is ≥1mm.

[0060] In this way, when the adapter structure or the electrode assembly is welded to the welding portion, the problem that the limiting groove is damaged during welding can be improved, the welding work of the welding portion can be ensured to a certain extent, and the limiting groove can effectively limit the limiting member.

[0061] In some embodiments, the welding portion protrudes from the groove wall of the limiting groove away from the outer peripheral wall of the electrode terminal in the radial direction of the lead-out hole, and the distance between the one end of the limiting groove close to the welding portion and the welding portion in the axial direction is 1.5mm-3.5mm.

[0062] In this way, the distance between the one end of the limiting groove close to the welding portion and the welding portion in the axial direction is appropriate, which can improve the problem of the limiting groove being damaged during welding, and make the limiting groove occupy a proper size proportion of the electrode terminal in the axial direction, so that the limiting groove can effectively limit the limiting member.

[0063] In some embodiments, the first insulating member further comprises a connecting member, which surrounds the outer periphery of the boss and is connected between the connecting member and the insulating body.

[0064] By surrounding the outer periphery of the boss and being connected between the connecting member and the insulating body, the connecting member is arranged between the inner peripheral wall of the lead-out hole and the outer peripheral wall of the boss. In this way, the connecting member not only connects the limiting member and the insulating body, but also insulates the shell and the boss, thereby improving the reliability of the battery monomer.

[0065] In some embodiments, the first insulating member is injection molded on the electrode terminal.

[0066] In this way, the limiting member of the first insulating member can fully enter the limiting groove, thereby forming a very firm and stable limiting relationship with the limiting groove. In this way, the bonding strength between the electrode terminal and the first insulating member can be improved to reduce the risk of the electrode terminal being pulled out of the shell.

[0067] In some embodiments, the battery monomer further comprises:

[0068] a second insulating member sleeved on the outer periphery of the electrode terminal;

[0069] a fixing member sleeved on the outer periphery of the electrode terminal, and the second insulating member is connected to the fixing member and separates the fixing member and the electrode terminal; and the fixing member is connected to the shell.

[0070] By arranging the second insulating member and the fixing member, the electrode terminal and the shell are insulated and connected.

[0071] In a second aspect, the embodiments of the present application provide a battery comprising the battery monomer.

[0072] The battery provided by the embodiments of the present application can reduce the risk of the electrode terminal being pulled out of the shell by using the above-mentioned battery monomer, improve the reliability of the battery monomer, and thus improve the reliability of the battery.

[0073] In a third aspect, the embodiments of the present application provide a power consumption device, comprising the battery.

[0074] The power consumption device provided by the embodiments of the present application can improve the stability and reliability of the battery, and further improve the reliability of the power consumption device.

[0075] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear, the embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following will describe the specific embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0076] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0077] Figure 1 The schematic diagram of the vehicle provided by some embodiments of the present application is shown in the figure;

[0078] Figure 2 The exploded view of the battery provided by some embodiments of the present application is shown in the figure;

[0079] Figure 3 The perspective structural diagram of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0080] Figure 4 The exploded view of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0081] Figure 5 The Figure 4 The enlarged view of A in the figure;

[0082] Figure 6 The Figure 3 The partial schematic diagram of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0083] Figure 7 The Figure 6 The sectional view along B-B is shown in the figure;

[0084] Figure 8 The Figure 7 The enlarged view of C in the figure;

[0085] Figure 9 The Figure 8 The enlarged view of D in the figure;

[0086] Figure 10 The Figure 3A structural view of an electrode terminal, a second insulating member, and a fixing member of a battery cell is provided.

[0087] Figure 11 A Figure 10 A sectional view along E-E.

[0088] Figure 12 A Figure 11 An enlarged view at G.

[0089] Figure 13 A partial sectional view of a battery cell according to another embodiment of the present application is provided.

[0090] Figure 14 A Figure 13 An enlarged view at G.

[0091] Figure 15 A partial schematic view of a battery cell according to another embodiment of the present application is provided.

[0092] Figure 16 A Figure 15 A sectional view along H-H.

[0093] Figure 17 A Figure 16 An enlarged view at I.

[0094] Figure 18 A Figure 17 An enlarged view at J.

[0095] Figure 19 A Figure 18 An enlarged sectional view of an electrode terminal.

[0096] Figure 20 A sectional view of an electrode terminal of a battery cell according to still another embodiment of the present application is provided.

[0097] Figure 21 A Figure 20 An enlarged view at K.

[0098] Figure 22 A partial exploded view of a battery cell according to still another embodiment of the present application is provided.

[0099] Figure 23 A Figure 22 An enlarged view at L.

[0100] Figure 24 A Figure 22 A mating schematic view.

[0101] Figure 25 A Figure 24 A sectional view along M-M.

[0102] Figure 26 AFigure 25 Enlarged view at N;

[0103] Figure 14 For Figure 17 to Figure 19 Enlarged view at O;

[0104] Figure 26 For Figure 13 Enlarged sectional view of the electrode terminal;

[0105] Figure 14 For Figure 13 Structure diagram of the electrode terminal of the battery cell provided by the present application;

[0106] Figure 15 Sectional view of the electrode terminal of the battery cell provided by some embodiments of the present application;

[0107] Figure 16 For Figure 15 Enlarged view at P.

[0108] In the drawings:

[0109] 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 10 - battery cell; 20 - box body; 21 - first part; 22 - second part; 1 - electrode assembly; 2 - shell; 201 - lead-out hole; 21 - housing; 22 - end cover; 3 - electrode terminal; 3a - positive electrode terminal; 3b - negative electrode terminal; 301 - limiting groove; 301a - first limiting groove; 301b - second limiting groove; 3011 - first groove segment; 3012 - second groove segment; 3013 - first groove wall; 3014 - second groove wall; 3015 - third groove wall; 3016 - fourth groove wall; 3017 - fifth groove wall; 3018 - sixth groove wall; 3019 - seventh groove wall; 3020 - eighth groove wall; 3021 - ninth groove wall; 3022 - tenth groove wall; 302 - first wall; 31 - terminal body; 32 - boss; 321 - welding portion; 33 - composite layer; 4 - first insulating piece; 41 - insulating body; 42 - limiting piece; 421 - first limiting portion; 422 - second limiting portion; 43 - connecting piece; 5 - fixing piece; 6 - second insulating piece; 7 - adapter structure; 8 - sealing ring; L1 - first dimension; L2 - second dimension; L3 - third dimension; L4 - fourth dimension; L5 - seventh dimension; L6 - eighth dimension; L7 - ninth dimension; L8 - tenth dimension; L9 - eleventh dimension; L10 - twelfth dimension; Z - axial direction; Y - circumferential direction; X - radial direction. DETAILED DESCRIPTION

[0110] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0111] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0112] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0113] In the description of this application, "multiple" means two or more, and unless otherwise expressly specified, "two or more" includes two. Accordingly, "multiple groups" means two or more groups, including two groups.

[0114] In the description of this application, unless otherwise expressly specified and limited, the terms "installation", "connection", "linking", "fixing", etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal connection of two components or the interaction between two components.

[0115] In the description of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three possibilities: A exists, A and B exist simultaneously, and B exists. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0116] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0117] In related technologies, a single battery cell includes an electrode assembly, a housing, and electrode terminals, with the electrode assembly located inside the housing. The electrode terminals are located on the housing and connected to the electrode assembly.

[0118] During charge-discharge cycles and collision tests of individual battery cells, the electrode terminals are subjected to compression during the expansion of the electrode assembly, which can cause the electrode terminals to detach from the outer casing, resulting in the failure of the connection between the electrode terminals and the electrode assembly.

[0119] Based on the above considerations, this application provides a battery cell, a battery, and an electrical device. An insulating body of a first insulating member is disposed between the outer casing and the electrode assembly. A limiting member of the first insulating member is inserted into a limiting groove of the electrode terminal, and the limiting groove is axially limited with the electrode terminal, thereby limiting the first insulating member and the electrode terminal in the axial direction. This results in a high bonding strength between the first insulating member and the electrode terminal, which in turn improves the bonding strength between the electrode terminal and the outer casing. This helps reduce the risk of the electrode terminal detaching from the outer casing and improves the reliability of the battery cell.

[0120] In some embodiments, the battery cell involved in this application can be used in an electrical device that uses the battery cell or battery as a power source.

[0121] The electrical devices involved in this application's embodiments can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, vehicles, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. According to the power source, vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. According to the drive method, vehicles can be front-wheel drive vehicles, rear-wheel drive vehicles, or four-wheel drive vehicles.

[0122] In other embodiments, the battery cells involved in this application can also be used in energy storage systems that use battery cells or batteries as energy storage elements. These energy storage systems may include energy storage containers, energy storage cabinets, etc.

[0123] The battery involved in this application embodiment can be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar. Mixed connection means that multiple battery cells are connected in both series and parallel.

[0124] 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.

[0125] In some embodiments, the battery can be a battery pack, which may include a housing and individual battery cells. As an example, the individual battery cells may be directly housed within the housing. Alternatively, the individual battery cells may be first formed into a battery module and then housed within the housing.

[0126] As an example, multiple battery cells can be fixed together to form a battery module using cable ties or similar methods.

[0127] As an example, multiple battery cells can also be fixed together to form a battery module using end plates, side plates, etc.

[0128] The battery cell involved in this application refers to the smallest unit that stores and outputs electrical energy. The battery cell can be a secondary battery or a primary battery. The battery cell can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell can be cylindrical, flat, cuboid, or other shapes.

[0129] For ease of description, this application uses a vehicle as an example to illustrate the embodiments of the electrical device.

[0130] In some embodiments, please refer to Figure 17 , Figure 16 This is a schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 has the aforementioned battery 100 disposed inside it, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also 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, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0131] In some embodiments, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0132] In some embodiments, please refer to Figure 18 , Figure 17This is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 may include a housing 20 and individual battery cells 10. The housing 20 has an internal space for accommodating the individual battery cells 10.

[0133] The housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first portion 21 and a second portion 22, which overlap each other and together define the internal space of the housing 20. The first portion 21 may be a hollow structure with an opening at one end, and the second portion 22 may be a plate-like structure, covering the opening side of the first portion 21, so that the first portion 21 and the second portion 22 together define the internal space of the housing 20. Alternatively, please refer to... Figure 19 Both the first part 21 and the second part 22 can be hollow structures with an opening at one end. The opening side of the first part 21 covers the opening side of the second part 22, so that the first part 21 and the second part 22 together define the internal space of the box 20. The box 20 composed of the first part 21 and the second part 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0134] In some embodiments, please refer to Figure 18 Multiple battery cells 10 can be connected in series, parallel, or mixed to form a whole, and then the whole formed by the multiple battery cells 10 is directly housed in the internal space of the housing 20. In other embodiments, multiple battery cells 10 can also be connected in series, parallel, or mixed to form a battery module, and the battery module is housed in the internal space of the housing 20. In still other embodiments, multiple battery cells 10 can also be connected in series, parallel, or mixed to form multiple battery modules, and the multiple battery modules can then be connected in series, parallel, or mixed to form a whole, and housed in the internal space of the housing 20.

[0135] In some embodiments, the housing 20 of the battery 100 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 may be at least a part of the chassis of the vehicle 1000, or a portion of the housing 20 may be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0136] In some embodiments, please refer to the following: Figure 22 and Figure 23 , Figure 22 This is a perspective structural diagram of a battery cell 10 provided in some embodiments of this application. Figure 24 for Figure 22 An exploded view. The battery cell 10 may include an electrode assembly 1, a housing 2, and electrode terminals 3.

[0137] Electrode assembly 1 is the component in the battery cell 10 where the electrochemical reaction takes place. Electrode assembly 1 is mainly formed by winding or stacking positive and negative electrode sheets, with a separator between them. The portions of the positive and negative electrode sheets containing active material constitute the main body of electrode assembly 1, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The tab of the positive electrode sheet is called the positive tab, and the tab of the negative electrode sheet is called the negative tab. The positive and negative tabs can be located together at one end of the main body or at opposite ends of the main body.

[0138] In a single battery cell 10, the number of electrode components 1 can be one or more.

[0139] In some contexts, electrode assembly 1 may also be referred to as bare cell, wound body, laminate, etc.

[0140] In some embodiments, the battery cell 10 may further include an electrolyte, which acts as a conductor of ions between the positive and negative electrode plates. The electrolyte described in this application embodiment may be liquid, gel-like, or solid.

[0141] The outer casing 2 is a structure used to define the internal environment of the battery cell 10. The outer casing 2 is used to house the electrode assembly 1 and the electrolyte.

[0142] In some embodiments, please continue reading Figure 24 and Figure 25 The outer casing 2 may include a housing 21 and an end cap 22. The housing 21 and end cap 22 are components that jointly define the internal environment of the battery cell 10. The internal environment defined by the housing 21 and end cap 22 is used to house the electrode assembly 1 and the electrolyte. The housing 21 and end cap 22 may be independent components. Specifically, as shown... Figure 24 and Figure 26 As shown, the housing 21 has an opening, and the end cap 22 is placed over the opening of the housing 21 to jointly define the internal environment of the battery cell 10 and isolate the internal environment of the battery cell 10 from the external environment. Alternatively, the housing 21 and the end cap 22 can be an integrated structure. Specifically, the end cap 22 and the housing 21 can form a common connection surface before the electrode assembly 1 is inserted into the housing. After the electrode assembly 1 is inserted into the housing, when it is necessary to encapsulate the electrode assembly 1, the end cap 22 is then placed over the housing 21.

[0143] The number of end caps 22 can be one, such as Figure 25 and Figure 14 As shown. Alternatively, there may be two end caps 22, which are respectively located at opposite ends of the housing 21.

[0144] The housing 21 can be cylindrical, square, or other shapes, depending on the specific shape and size of the electrode assembly 1. Furthermore, the housing 21 and end cap 22 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0145] Electrode terminal 3 refers to a structure with conductive properties. Electrode terminal 3 is disposed on the housing 2 and connected to the electrode assembly 1. Electrode terminal 3 serves as the current transmission terminal of the battery cell 10 for transmitting current.

[0146] Electrode terminal 3 is connected to electrode assembly 1, specifically to the tab of electrode assembly 1. The electrode terminal 3 and the tab can be directly connected by welding, bonding, or other methods; or, as... Figure 17 to Figure 19 As shown, a transition structure 7 can also be provided between the electrode terminal 3 and the tab. The transition structure 7 is connected to the electrode terminal 3 and the tab to realize the transition between the electrode terminal 3 and the tab so that current can be passed through, thereby indirectly realizing the connection between the electrode terminal 3 and the tab.

[0147] The transition structure 7 refers to a metal structure with conductive properties, such as, but not limited to, a copper busbar.

[0148] In some embodiments, please refer to Figure 26 There are two electrode terminals 3, namely positive electrode terminal 3a and negative electrode terminal 3b. Positive electrode terminal 3a is connected to the positive electrode tab of electrode assembly 1, and negative electrode terminal 3b is connected to the negative electrode tab of electrode assembly 1.

[0149] The electrode terminal 3 can be disposed on the housing 21 of the outer casing 2, or on the end cover 22 of the outer casing 2. Specifically, the positive electrode terminal 3a and the negative electrode terminal 3b can both be disposed on the housing 21; or, as... Figure 13 to Figure 19 As shown, the positive electrode terminal 3a and the negative electrode terminal 3b are both provided on the end cover 22; or, one of the positive electrode terminal 3a and the negative electrode terminal 3b is provided on the housing 21 and the other is provided on the end cover 22.

[0150] Among them, such as Figure 26 As shown, the positive electrode terminal 3a and the negative electrode terminal 3b can be located at the same end of the housing 2. Alternatively, the positive electrode terminal 3a and the negative electrode terminal 3b can be located at opposite ends of the housing 2.

[0151] The electrode terminal 3 can be made of metal and may be, but is not limited to, a post. As an example, the positive electrode terminal 3a is an aluminum post made of aluminum, and the negative electrode terminal 3b is a composite post made of aluminum and copper. The copper portion of the negative electrode terminal 3b is used to connect to the tab.

[0152] Please refer to the following: Figure 17 And in conjunction with other accompanying figures. Figure 26 for Figure 13 to Figure 19 Enlarged view of point A in the middle. Figure 17 to Figure 19 for Figure 5 to Figure 19 A partial schematic diagram of the provided battery cell 10. Figure 5 to Figure 19 In the middle, the battery cell 10 is perpendicular to the axis Z. Figure 9 for Figure 12 A sectional view along BB. Figure 9 for Figure 12 Enlarged view at point C in the middle. Figure 9 for Figure 12 Enlarged view of point D in the middle. Figure 20 for Figure 21 The provided structural diagram shows the electrode terminal 3, the second insulating member 6, and the fixing member 5 of the battery cell 10. Figure 20 for Figure 21 A sectional view along EE, Figure 20 for Figure 20 A magnified view of point F in the middle. Figure 21 The electrode terminal 3 shown is the negative electrode terminal 3b. The battery cell 10 provided in this embodiment includes a housing 2, an electrode assembly 1, electrode terminals 3, and a first insulating member 4. The housing 2 has a lead-out hole 201. The electrode assembly 1 is disposed within the housing 2. The electrode terminal 3 passes through the lead-out hole 201; or, the electrode terminal 3 is disposed opposite to the lead-out hole 201. The electrode terminal 3 is connected to the housing 2 and the electrode assembly 1, and has a limiting groove 301. The first insulating member 4 includes an insulating body 41 and a limiting member 42 connected to the insulating body 41. The insulating body 41 is disposed between the housing 2 and the electrode assembly 1. The limiting member 42 is inserted into the limiting groove 301, and forms a limiting relationship with the limiting groove 301 in the axial direction Z of the lead-out hole 201.

[0153] The lead-out hole 201 is a through hole penetrating the wall of the outer casing 2, used to connect the electrode terminal 3 to the electrode assembly 1 through the lead-out hole 201. The penetrating direction of the lead-out hole 201 on the outer casing 2 is the axial direction Z of the lead-out hole 201. Unless otherwise specified, axial direction Z refers to the axial direction Z of the lead-out hole 201.

[0154] The inner circumferential wall of the outlet hole 201 extends approximately circumferentially, and this circumferential direction of the outlet hole 201 is called the circumferential direction Y of the outlet hole 201. The circumferential direction Y of the outlet hole 201 is perpendicular to the axial direction Z. Unless otherwise specified, the circumferential direction Y refers to the circumferential direction Y of the outlet hole 201. In a cross-section perpendicular to the axial direction Z, the inner contour of the outlet hole 201 can be circular, square, prismatic, elliptical, or other shapes.

[0155] The inner peripheral wall of the outlet hole 201 extends approximately along the circumferential direction Y, roughly defining a circle. The radius of the circle roughly defined by the inner peripheral wall of the outlet hole 201 is the radial direction X of the outlet hole 201. Unless otherwise specified, radial X refers to the radial direction X of the outlet hole 201.

[0156] In some possible designs, such as Figure 20 and Figure 21 As shown, electrode terminal 3 passes through lead-out hole 201, specifically, at least a portion of electrode terminal 3 is located within lead-out hole 201. Alternatively, in some other possible designs, electrode terminal 3 does not pass through lead-out hole 201, but is arranged opposite to lead-out hole 201 along the Z-axis. In these cases, electrode terminal 3 can be connected to electrode assembly 1 through lead-out hole 201.

[0157] Electrode terminal 3 is connected to housing 2, specifically, electrode terminal 3 is insulated from housing 2. An insulating structure is provided between electrode terminal 3 and housing 2. This insulating structure may be, but is not limited to, the second insulating element 6 described below, used to achieve insulation between housing 2 and electrode terminal 3.

[0158] Electrode terminal 3 is connected to electrode assembly 1, enabling electrical conductivity between electrode terminal 3 and electrode assembly 1. Alternatively, electrode terminal 3 can be directly connected to electrode assembly 1; or electrode terminal 3 and electrode assembly 1 can be connected by a transition structure 7, enabling indirect electrical conductivity between electrode terminal 3 and electrode assembly 1.

[0159] The limiting groove 301 is a groove on the electrode terminal 3 used to limit the first insulating member 4.

[0160] The first insulating component 4 is a part with insulating properties used to achieve an insulating effect between the housing 2 and the electrode assembly 1. The first insulating component 4 may be, but is not limited to, a plastic part.

[0161] The insulating body 41 is the main body of the first insulating member 4, and the limiting member 42 is the part on the first insulating member 4 that is used to cooperate with the limiting groove 301. Both the insulating body 41 and the limiting member 42 have insulating properties.

[0162] The insulating body 41 is disposed between the outer shell 2 and the electrode assembly 1. Specifically, the insulating body 41 is disposed inside the outer shell 2 and is mainly disposed between the outer shell 2 and the electrode assembly 1 to achieve the insulation effect between the outer shell 2 and the electrode assembly 1.

[0163] The limiting member 42 is inserted into the limiting groove 301, and the two ends of the limiting member 42 opposite to each other along the axial Z can respectively limit and cooperate with the two sides of the limiting groove 301 opposite to each other along the axial Z, so that the limiting member 42 can be limited between the two sides of the limiting groove 301 opposite to each other along the axial Z, thereby forming a limit on the limiting member 42 and the limiting groove 301 in the axial Z, thereby realizing the limiting of the first insulating member 4 and the electrode terminal 3 in the axial Z, thus realizing the limiting of the electrode terminal 3 and the outer shell 2 in the axial Z.

[0164] The battery cell 10 provided in this embodiment is disposed between the outer casing 2 and the electrode assembly 1 via the insulating body 41 of the first insulating member 4. The limiting member 42 of the first insulating member 4 is inserted into the limiting groove 301 of the electrode terminal 3 and is limited and engaged with the limiting groove 301 along the axial direction Z of the electrode terminal 3. This allows the first insulating member 4 and the electrode terminal 3 to be limited in the axial direction Z, thereby achieving a high bonding strength between the first insulating member 4 and the electrode terminal 3, which in turn improves the bonding strength between the electrode terminal 3 and the outer casing 2. This helps to reduce the risk of the electrode terminal 3 detaching from the outer casing 2 and improves the reliability of the battery cell 10.

[0165] In some embodiments, please refer to the following: Figure 20 And in conjunction with other accompanying drawings. The electrode terminal 3 includes a terminal body 31 and a boss 32. The terminal body 31 is connected to the housing 2 and covers the lead-out hole 201. The boss 32 is located at one end of the terminal body 31 near the electrode assembly 1 and passes through the lead-out hole 201. The boss 32 is connected to the electrode assembly 1, and at least a portion of the limiting groove 301 is provided on the boss 32.

[0166] The terminal body 31 and the boss 32 are two parts of the electrode terminal 3, both of which are conductive. In the axial direction Z, the terminal body 31 is located at the end of the lead-out hole 201 away from the electrode assembly 1, and the boss 32 is located at the end of the terminal body 31 closer to the electrode assembly 1. The radial dimension of the terminal body 31 is larger than the radial dimension of the boss 32, allowing the terminal body 31 to cover the lead-out hole 201, and the boss 32 to pass through the lead-out hole 201. The boss 32 passing through the lead-out hole 201 means that at least a portion of the boss 32 is located within the lead-out hole 201.

[0167] The terminal body 31 is connected to the housing 2, specifically, the terminal body 31 is insulated from the housing 2. A second insulating element 6, which may be provided between the terminal body 31 and the housing 2 as described below, may be used to achieve insulation between the terminal body 31 and the housing 2.

[0168] In some possible designs, such as Figure 21As shown, the limiting groove 301 is provided on the boss 32. Alternatively, in some other possible designs, part of the limiting groove 301 is provided on the boss 32, and another part may be provided on the composite layer 33 mentioned below, or on the composite layer 33 and the terminal body 31.

[0169] The electrode terminal 3 is provided with a boss 32 that passes through the lead-out hole 201, and at least part of the limiting groove 301 is provided on the boss 32, so that the boss 32 can approach the first insulating member 4 along the axial direction Z. This facilitates the limiting member 42 and the limiting groove 301 of the first insulating member 4 to form a limiting in the axial direction Z, thereby improving the bonding strength between the first insulating member 4 and the electrode terminal 3, thereby improving the bonding strength between the electrode terminal 3 and the housing 2, helping to reduce the risk of the electrode terminal 3 falling off the housing 2, and improving the reliability of the battery cell 10.

[0170] In some embodiments, please refer to the following: Figure 20 And in conjunction with other accompanying drawings. At least one limiting groove 301 is a first limiting groove 301a, which includes a first groove segment 3011 and a second groove segment 3012 communicating with the first groove segment 3011. The limiting member 42 includes a first limiting part 421 and a second limiting part 422 connected to the first limiting part 421, at least one of the first limiting part 421 and the second limiting part 422 being connected to the insulating body 41. The first limiting part 421 is axially limited to the first groove segment 3011 along the Z-axis, and the second limiting part 422 is radially limited to the second groove segment 3012 along the X-axis of the lead-out hole 201.

[0171] The first groove segment 3011 and the second groove segment 3012 are two sections of the limiting groove 301.

[0172] The first limiting part 421 and the second limiting part 422 are two parts of the limiting member 42.

[0173] Understandably, the first groove segment 3011 has two groove walls that are opposite each other along the axial direction ZZ, namely the first groove wall 3013 and the second groove wall 3014. The first limiting part 421 is limited between the first groove wall 3013 and the second groove wall 3014 of the first groove segment 3011, thereby being limited to the first groove segment 3011 along the axial direction Z.

[0174] The second groove segment 3012 has two opposite groove walls along the radial X direction, namely the third groove wall 3015 and the fourth groove wall 3016. The second limiting part 422 is limited between the third groove wall 3015 and the fourth groove wall 3016, thereby being limited within the second groove segment 3012 along the radial X direction.

[0175] By adopting the above technical solution, the limiting member 42 can be limited in the limiting groove 301 along the axial direction Z and the radial direction X. This can improve the limiting strength of the limiting member 42 on the electrode terminal 3, thereby improving the bonding strength between the first insulating member 4 and the electrode terminal 3. This helps to reduce the risk of the electrode terminal 3 coming off the first insulating member 4, and further helps to reduce the risk of the electrode terminal 3 coming off the outer casing 2, thereby improving the reliability of the battery cell 10.

[0176] In some embodiments, please refer to the following: Figure 21 , Figure 22 to Figure 29 and Figure 27 And in conjunction with other accompanying drawings. The second groove segment 3012 can be bent relative to the first groove segment 3011. Correspondingly, the second limiting portion 422 can also be bent relative to the first limiting portion 421. In this way, the first limiting portion 421 can be axially limited within the first groove segment 3011, and the second limiting portion 422 can be radially limited within the second groove segment 3012.

[0177] In some embodiments, such as Figure 26 As shown, the first groove segment 3011 and the second groove segment 3012 are distributed along the radial direction X. Correspondingly, the first limiting part 421 and the second limiting part 422 are also distributed along the radial direction X.

[0178] In some embodiments, please refer to the following: Figure 28 And in conjunction with other accompanying drawings. In the axial direction Z, the second groove segment 3012 protrudes from at least one side of the first groove segment 3011.

[0179] Among them, such as Figure 27 As shown, the second groove segment 3012 may protrude along the axial direction Z from one side of the first groove segment 3011. Alternatively, the second groove segment 3012 may also protrude along the axial direction Z from opposite sides of the first groove segment 3011.

[0180] Specifically, the second groove segment 3012 extends along the axial direction Z, protruding beyond the first groove segment 3011, thus forming a stepped structure between the first groove segment 3011 and the second groove, and this stepped structure and the first groove segment 3011 are distributed along the axial direction ZZ. In some possible designs, such as... Figure 29 As shown, the first groove wall 3013 and the third groove wall 3015 are both located on the stepped structure.

[0181] Correspondingly, the second limiting part 422 protrudes along the axial direction Z from at least one side of the first limiting part 421, so that the first limiting part 421 can be adapted to be limited within the first groove segment 3011, and the second limiting part 422 can be adapted to be limited within the second groove segment 3012.

[0182] The second groove segment 3012 protrudes axially Z from at least one side of the first groove segment 3011, so that the second groove segment 3012 can be used to limit the second limiting part 422 radially X, thereby improving the bonding strength between the first insulating member 4 and the electrode terminal 3, and further improving the bonding strength between the electrode terminal 3 and the housing 2, which helps to reduce the risk of the electrode terminal 3 detaching from the housing 2 and improve the reliability of the battery cell 10.

[0183] In some embodiments, please refer to the following: Figure 22 Furthermore, in conjunction with other accompanying drawings, the limiting groove 301 can be configured as an annular groove, extending circumferentially Y-shapedly along the outlet hole 201. Correspondingly, the limiting member 42 is also configured as an annular structure, extending circumferentially Y-shapedly along the outlet hole 201.

[0184] In some embodiments, please refer to the following: Figure 27 to Figure 29 22 to Figure 26 And in conjunction with other accompanying figures. Figure 29 This is a partial cross-sectional view of a battery cell 10 provided in other embodiments of this application. Figure 27 for Figure 28 A magnified view of point G in the middle.

[0185] Figure 26 to Figure 29 This is a partial schematic diagram of a battery cell 10 provided in other embodiments of this application. Figure 27 for Figure 28 A cross-sectional view along HH, Figure 30 for Figure 31 Enlarged view at point I in the middle. Figure 30 for Figure 31 Enlarged view at point J in the middle. Figure 30 Figure 30 An enlarged cross-sectional view of electrode terminal 3. Figure 31 This is a partial exploded view of the battery cell 10 provided in some embodiments of this application. Figure 30 for Figure 31 A magnified view of point L in the middle. Figure 12 for Figure 29 A schematic diagram of the cooperation, in which, Figure 12 In the middle, the battery cell 10 is parallel to the axis Z. Figure 20 for Figure 21 A sectional view along MM, Figure 12 for Figure 21 A magnified view of point N in the middle. Among them, Figure 21 , Figure 12 , Figure 12 All electrode terminals 3 shown are negative electrode terminals 3b. There are multiple limiting grooves 301, which are spaced apart along the circumferential Y-axis of the lead-out hole 201. That is, the limiting grooves 301 are not annular grooves.

[0186] Correspondingly, there are also multiple limiting members 42, which are distributed at intervals along the circumferential Y direction, and are respectively limited in multiple limiting grooves 301 along the circumferential Y direction.

[0187] As an example, the number of limiting members 42 is the same as the number of limiting grooves 301, and multiple limiting members 42 and multiple limiting grooves 301 are set in a one-to-one correspondence, with each limiting member 42 corresponding to a limiting groove 301 along the circumferential Y direction.

[0188] With this configuration, the limiting member 42 is confined within the limiting groove 301, which can achieve relative positioning of the electrode terminal 3 and the first insulating member 4 in the circumferential Y direction, thereby limiting the relative rotation of the electrode terminal 3 and the first insulating member 4 in the circumferential Y direction. This can improve the bonding strength between the electrode terminal 3 and the first insulating member 4, thereby improving the bonding strength between the electrode terminal 3 and the housing 2, reducing the risk of the electrode terminal 3 detaching from the housing 2, reducing the problem of connection failure between the electrode terminal 3 and the electrode assembly 1, and improving the reliability of the battery cell 10.

[0189] In some embodiments, please refer to the following: Figure 12 22 to Figure 8 And in conjunction with other accompanying drawings. There are multiple limiting grooves 301, which are distributed at intervals along the circumferential Y direction of the lead-out hole 201. The first limiting part 421 is located within the first groove segment 3011 along the circumferential Y direction, and / or the second limiting part 422 is located within the second groove segment 3012 along the circumferential Y direction.

[0190] Understandably, in some possible designs, such as Figure 9 and Figure 8 to Figure 12 As shown, the first limiting part 421 is located within the first groove segment 3011 along the circumferential Y-direction, and the second limiting part 422 is located within the second groove segment 3012 along the circumferential Y-direction. Alternatively, in some other possible designs, the first limiting part 421 is located within the first groove segment 3011 along the circumferential Y-direction, while the second limiting part 422 is not located within the second groove segment 3012 along the circumferential Y-direction. Alternatively, in still some possible designs, the second limiting part 422 is located within the second groove segment 3012 along the circumferential Y-direction, while the first limiting part 421 is not located within the first groove segment 3011 along the circumferential Y-direction.

[0191] This configuration ensures that the limiting member 42 is positioned within the limiting groove 301 along the circumferential Y direction, thereby achieving relative positioning of the electrode terminal 3 and the first insulating member 4 in the circumferential Y direction. This limits the relative rotation of the electrode terminal 3 and the first insulating member 4. This improves the bonding strength between the first insulating member 4 and the electrode terminal 3, thus enhancing the bonding strength between the electrode terminal 3 and the housing 2. This helps reduce the risk of the electrode terminal 3 detaching from the housing 2 and improves the reliability of the battery cell 10.

[0192] In some embodiments, please refer to the following: Figure 2 And in conjunction with other accompanying drawings. In the circumferential Y direction, the second groove segment 3012 protrudes from at least one side of the first groove segment 3011.

[0193] The second groove segment 3012 may protrude circumferentially (Y) from one side of the first groove segment 3011. Alternatively, as... Figure 1 As shown, the second groove segment 3012 can also protrude circumferentially Y-shaped from the opposite sides of the first groove segment 3011.

[0194] Specifically, the second groove segment 3012 extends circumferentially in the Y direction, protruding beyond the first groove segment 3011, thus forming a stepped structure between the first groove segment 3011 and the second groove, and the stepped structure and the first groove segment 3011 are distributed circumferentially in the YY direction. In some possible designs, the third groove wall 3015 is provided on the stepped structure.

[0195] Correspondingly, the second limiting part 422 protrudes circumferentially Y from at least one side of the first limiting part 421, so that the first limiting part 421 can be adapted to be limited within the first groove segment 3011, and the second limiting part 422 can be adapted to be limited within the second groove segment 3012.

[0196] The second groove segment 3012 protrudes circumferentially Y from at least one side of the first groove segment 3011, so that the second groove segment 3012 can be used to limit the second limiting part 422 radially X, thereby improving the bonding strength between the first insulating member 4 and the electrode terminal 3, helping to reduce the risk of the electrode terminal 3 detaching from the housing 2, and improving the reliability of the battery cell 10.

[0197] In some embodiments, please refer to the following: Figure 3 to Figure 12 And in conjunction with other accompanying drawings. The electrode terminal 3 includes a terminal body 31 and a boss 32. The terminal body 31 is connected to the housing 2 and covers the lead-out hole 201. The boss 32 is located at one end of the terminal body 31 near the electrode assembly 1 and passes through the lead-out hole 201. The boss 32 is connected to the electrode assembly 1. A first groove segment 3011 is provided on the outer peripheral wall of the boss 32, and at least a portion of a second groove segment 3012 is provided on the boss 32.

[0198] Understandably, the first groove segment 3011 penetrates the outer peripheral wall of the boss 32 along the radial direction X, so as to be exposed on the outer peripheral wall of the boss 32. The first groove segment 3011 and the second groove segment 3012 can be distributed approximately along the radial direction X.

[0199] Based on this, the first limiting part 421 can be connected to the insulating body 41, and the second limiting part 422 can be connected to the first limiting part 421, so that the first limiting part 421 and the second limiting part 422 can be distributed approximately along the radial X.

[0200] In some possible designs, such as​ As shown, the second groove segment 3012 is provided on the boss 32. Alternatively, in some other possible designs, part of the first groove segment 3011 is provided on the boss 32, and another part may be provided on the composite layer 33 mentioned below, or on the composite layer 33 and the terminal body 31.

[0201] By adopting the above technical solution, at least a portion of the first insulating member 4 can be disposed on the outer periphery of the boss 32, thereby enabling the first insulating member 4 to not only achieve insulation between the outer shell 2 and the electrode assembly 1, but also to achieve insulation between the boss 32 and the outer shell 2, which helps to improve the reliability of the battery cell 10.

[0202] In some embodiments, please refer to the following: ​ and ​ Furthermore, in conjunction with other accompanying drawings, the second limiting part 422 is also axially Z-limited within the second groove section 3012.

[0203] Specifically, the first groove segment 3011 and the second groove segment 3012 are distributed radially X. The second groove segment 3012 has two opposite groove walls along the axial direction Z, namely the fifth groove wall 3017 and the sixth groove wall 3018. The second limiting part 422 is limited between the fifth groove wall 3017 and the sixth groove wall 3018, thereby being limited within the second groove segment 3012 along the axial direction Z.

[0204] In some possible designs, such as ​ and ​ As shown in the figure and in conjunction with other accompanying drawings, the first groove wall 3013, the third groove wall 3015, the fifth groove wall 3017, the fourth groove wall 3016, the sixth groove wall 3018, and the second groove wall 3014 are connected in sequence. The first groove wall 3013 and the second groove wall 3014 are arranged at intervals and are respectively connected to the outer peripheral wall of the boss 32.

[0205] Understandably, the limiting groove 301 passes through the outer peripheral wall of the boss 32 in the radial direction X, but does not pass through the electrode terminal 3 in the axial direction Z.

[0206] This configuration ensures that the second limiting portion 422 is confined within the second groove segment 3012 along both the radial direction X and the axial direction Z. This enhances the limiting strength of the limiting member 42 and the limiting groove 301 in the axial direction Z, thereby increasing the bonding strength between the first insulating member 4 and the electrode terminal 3. This helps reduce the risk of the electrode terminal 3 detaching from the housing 2 and improves the reliability of the battery cell 10.

[0207] In some embodiments, please refer to the following: ​ and ​And in conjunction with other accompanying drawings. The first dimension L1 of the boss 32 = [1 / 3, 2 / 3] * the second dimension L2 of the boss 32. Wherein, the first dimension L1 is the distance in the radial X direction between the groove wall of the second groove segment 3012 near the outer peripheral wall of the boss 32 and the outer peripheral wall of the boss 32. The second dimension L2 is the distance in the radial X direction between the groove wall of the second groove segment 3012 away from the outer peripheral wall of the boss 32 and the outer peripheral wall of the boss 32.

[0208] In the radial direction X, the groove wall of the second groove segment 3012 near the outer peripheral wall of the boss 32 is the aforementioned third groove wall 3015. In the radial direction X, the groove wall of the second groove segment 3012 away from the outer peripheral wall of the boss 32 is the aforementioned fourth groove wall 3016.

[0209] Understandably, the distance between the outer peripheral walls of the third groove wall 3015 and the boss 32 in the radial X direction is the first dimension L1, and the distance between the outer peripheral walls of the fourth groove wall 3016 and the boss 32 in the radial X direction is the second dimension L2.

[0210] Wherein, the first dimension L1 < the second dimension L2, and the first dimension L1 = [1 / 3, 2 / 3] * the second dimension L2. That is, the first dimension L1 ≥ 1 / 3 * the second dimension L2, and the first dimension L1 ≤ 2 / 3 * the second dimension L2.

[0211] This design ensures that the stepped structure formed by the first groove segment 3011 and the second groove segment 3012 has a suitable size in the radial direction X. On the one hand, this prevents the limiting groove 301 from excessively occupying the volume of the boss 32, thus ensuring the structural strength and current-carrying capacity of the boss 32 to a certain extent. On the other hand, the stepped structure provides a more reliable limiting effect on the second limiting part 422 in the radial direction X, thereby improving the limiting strength of the limiting member 42 and the limiting groove 301 in the radial direction X. This enhances the bonding strength between the first insulating member 4 and the electrode terminal 3, helping to reduce the risk of the electrode terminal 3 detaching from the housing 2 and improving the reliability of the battery cell 10.

[0212] In some embodiments, please refer to the following: ​ and ​ And in conjunction with other accompanying figures. ​ This is a cross-sectional view of the electrode terminal 3 of the battery cell 10 provided in some embodiments of this application. ​ for ​ A magnified view of point K. ​ and ​ The electrode terminal 3 shown is the negative electrode terminal 3b. The second groove segment 3012 is provided at the end of the electrode terminal 3 along the axial direction Z close to the electrode assembly 1.

[0213] For ease of description, the end of electrode terminal 3 closest to electrode assembly 1 along the axial direction Z is designated as the first wall 302.

[0214] When the electrode terminal 3 includes a terminal body 31 and a boss 32, the first wall 302 is located at the end of the boss 32 that is away from the terminal body 31 along the axial direction Z, that is, at the end of the boss 32 that is close to the electrode assembly 1 along the axial direction Z.

[0215] Understandably, the second groove segment 3012 extends through the first wall 302 of the electrode terminal 3 along the axial direction Z, so as to be exposed on the first wall 302.

[0216] By adopting the above technical solution, it is easy to connect and cooperate with the limiting component 42 and the limiting groove 301.

[0217] In some embodiments, please refer to the following: ​ and ​ In conjunction with other accompanying drawings, the first groove segment 3011 and the second groove segment 3012 are distributed along the axial direction Z, and the first limiting part 421 is also limited to the first groove segment 3011 along the radial direction X.

[0218] Specifically, the first groove segment 3011 has two opposite groove walls along the radial X direction, namely the seventh groove wall 3019 and the eighth groove wall 3020. The first limiting part 421 is limited between the seventh groove wall 3019 and the eighth groove wall 3020, thereby being limited within the first groove segment 3011 along the radial X direction.

[0219] In some possible designs, such as ​ and ​ As shown in the figure and in conjunction with other accompanying drawings, the third trench wall 3015, the first trench wall 3013, the seventh trench wall 3019, the second trench wall 3014, the eighth trench wall 3020 and the fourth trench wall 3016 are connected in sequence, with the third trench wall 3015 and the fourth trench wall 3016 arranged at intervals and respectively connected to the first wall 302.

[0220] Understandably, the limiting groove 301 passes through the end of the boss 32 away from the terminal body 31 along the axial direction Z, but does not pass through the outer peripheral wall of the boss 32 along the radial direction X.

[0221] This configuration ensures that the first limiting portion 421 is confined within the first groove segment 3011 along both the radial direction X and the axial direction Z. This enhances the limiting strength of the limiting member 42 and the limiting groove 301 in the axial direction Z, thereby increasing the bonding strength between the first insulating member 4 and the electrode terminal 3. This helps reduce the risk of the electrode terminal 3 detaching from the housing 2 and improves the reliability of the battery cell 10.

[0222] In some embodiments, please refer to the following: ​ and ​And in conjunction with other accompanying drawings. The third dimension L3 of electrode terminal 3 = [1 / 3, 2 / 3] * the fourth dimension L4 of electrode terminal 3. Wherein, the third dimension L3 is the distance in the axial direction Z between the first groove segment 3011 near the groove wall of electrode assembly 1 and the end of electrode terminal 3 near electrode assembly 1. The fourth dimension L4 is the distance in the axial direction Z between the first groove segment 3011 away from the groove wall of electrode assembly 1 and the end of electrode terminal 3 near electrode assembly 1.

[0223] The end of the electrode terminal 3 closest to the electrode assembly 1 is the first wall 302. In the axial direction Z, the first groove segment 3011 near the electrode assembly 1 is the first groove wall 3013. In the axial direction Z, the first groove segment 3011 away from the electrode assembly 1 is the second groove wall 3014.

[0224] Understandably, the distance between the first groove wall 3013 and the first wall 302 is the third dimension L3, and the distance between the second groove wall 3014 and the first wall 302 is the fourth dimension L4.

[0225] Wherein, the third dimension L3 < the fourth dimension L4, and the third dimension L3 = [1 / 3 ~ 2 / 3] * the fourth dimension L4. That is, the third dimension L3 ≥ 1 / 3 * the fourth dimension L4, and the third dimension L3 ≤ 2 / 3 * the fourth dimension L4.

[0226] This design ensures that the stepped structure formed by the first groove segment 3011 and the second groove segment 3012 has a suitable dimension in the axial Z direction. This serves two purposes: firstly, it prevents the limiting groove 301 from excessively occupying the volume of the electrode terminal 3, thus ensuring the structural strength and current-carrying capacity of the electrode terminal 3 to a certain extent. Secondly, the stepped structure provides a more reliable limiting effect on the first limiting part 421 in the axial Z direction, thereby improving the limiting strength of the limiting member 42 and the limiting groove 301 in the radial X and axial Z directions. This enhances the bonding strength between the first insulating member 4 and the electrode terminal 3, helping to reduce the risk of the electrode terminal 3 detaching from the housing 2 and improving the reliability of the battery cell 10.

[0227] It should be further explained that, in the case where the limiting groove 301 penetrates the outer peripheral wall of the boss 32 radially (X) but not the first wall 302 axially (Z); or, in the case where the limiting groove 301 penetrates the first wall 302 axially (Z) but not the outer peripheral wall of the boss 32 radially (X): in some possible designs, the limiting groove 301 can extend circumferentially (Y) to form a roughly annular shape, surrounding the outer periphery of the boss 32. Based on this, the limiting member 42 can extend circumferentially (Y) to form a roughly annular shape; or it can be configured as multiple members, with the multiple limiting members 42 spaced apart circumferentially (Y). In other possible designs, the limiting groove 301 can also be configured as multiple members, with the multiple limiting grooves 301 spaced apart circumferentially (Y). Based on this, the multiple limiting members 42 can be configured as multiple members, with the multiple limiting members 42 spaced apart circumferentially (Y), and the multiple limiting members 42 can be correspondingly confined within the multiple limiting grooves 301.

[0228] In some other embodiments, the limiting groove 301 can penetrate the outer peripheral wall of the boss 32 radially X and penetrate the first wall 302 axially Z. Based on this, there are multiple limiting grooves 301, which are spaced apart circumferentially Y to ensure the structural integrity of the electrode terminal 3. Correspondingly, multiple limiting members 42 are provided, which are spaced apart circumferentially Y, and each limiting member 42 is correspondingly confined within a multiple limiting groove 301.

[0229] In some embodiments, please refer to the following: ​ And in conjunction with other accompanying figures. ​ for ​ Enlarged view of point O in the middle. ​ for ​ An enlarged cross-sectional view of electrode terminal 3. ​ for ​ A structural diagram of the electrode terminal 3 of the provided battery cell 10. Wherein, ​ All electrode terminals 3 shown are negative electrode terminals 3b. At least one limiting groove 301 is a second limiting groove 301b, which is provided on the outer peripheral wall of the boss 32. In the radial direction X of the lead-out hole 201, the cross-sectional area of ​​the second limiting groove 301b perpendicular to the radial direction X gradually decreases toward the outer peripheral wall of the boss 32.

[0230] Understandably, the second limiting groove 301b can penetrate the outer peripheral wall of the boss 32 along the radial X. In the direction of the second limiting groove 301b toward the outer peripheral wall of the boss 32 along the radial X, the cross section of the second limiting groove 301b perpendicular to the radial X is gradually tapered.

[0231] Correspondingly, in the direction of the second limiting groove 301b toward the outer peripheral wall of the boss 32 along the radial X, the cross section of the limiting member 42 perpendicular to the radial X is gradually reduced.

[0232] This configuration allows the groove wall of the second limiting groove 301b to radially limit the limiting member 42 (X). Thus, the first limiting groove 301a and the limiting member 42 can limit movement not only in the axial direction (Z) but also in the radial direction (X). This helps improve the bonding strength between the electrode terminal 3 and the first insulating member 4, thereby reducing the risk of the electrode terminal 3 detaching from the housing 2 and improving the reliability of the battery cell 10.

[0233] In some embodiments, please refer to the following: ​ and ​ Furthermore, in conjunction with other accompanying drawings, there are multiple second limiting grooves 301b, which are distributed at intervals along the circumferential Y-axis of the lead-out hole 201.

[0234] Correspondingly, there are multiple limiting members 42, which are distributed at intervals along the circumferential direction Y, and are respectively limited within multiple second limiting grooves 301b along the circumferential direction Y. As an example, the multiple limiting members 42 and the multiple second limiting grooves 301b are set in a one-to-one correspondence, and each limiting member 42 is respectively limited within each second limiting groove 301b.

[0235] In some embodiments, please refer to the following: ​ and ​ Furthermore, in conjunction with other accompanying drawings, the circumferential dimension of the second limiting groove 301b gradually decreases along the radial X direction towards the outer peripheral wall of the boss 32.

[0236] Understandably, in the direction of the second limiting groove 301b toward the outer peripheral wall of the boss 32 along the radial X direction, the circumferential dimension of the second limiting groove 301b is gradually reduced, so that the cross section of the second limiting groove 301b perpendicular to the radial X is gradually reduced.

[0237] This configuration allows the second limiting groove 301b to radially limit the limiting member 42 on at least one side of its groove wall along the circumferential Y direction. Furthermore, the second limiting groove 301b can also limit the limiting member 42 in the axial Z and circumferential Y directions.

[0238] In some embodiments, the axial dimension of the second limiting groove 301b is gradually reduced along the radial X toward the outer peripheral wall of the boss 32.

[0239] Understandably, the axial dimension of the second limiting groove 301b is gradually reduced in the direction of radial X toward the outer peripheral wall of the boss 32, so that the cross section of the second limiting groove 301b perpendicular to radial X is gradually reduced.

[0240] This configuration allows the second limiting groove 301b to radially limit the limiting member 42 on at least one side of the groove wall along the axial direction Z.

[0241] Based on this, in some possible designs, the second limiting groove 301b can be annular, surrounding the outer periphery of the boss 32; correspondingly, there can also be multiple second limiting grooves 301b, with multiple second limiting members 42 distributed at intervals along the circumferential Y direction. In other possible designs, there can be multiple second limiting grooves 301b, distributed at intervals along the circumferential Y direction; correspondingly, there can be multiple limiting members 42, distributed at intervals along the circumferential Y direction, and each correspondingly limited within multiple second limiting grooves 301b.

[0242] By adopting the above technical solution, the cross-sectional area of ​​the second limiting groove 301b perpendicular to the radial X direction towards the outer peripheral wall of the boss 32 can be gradually reduced, thereby enabling the groove wall of the second limiting groove 301b to radially limit the limiting member 42. This helps to improve the bonding strength between the electrode terminal 3 and the first insulating member 4, thereby improving the bonding strength between the first insulating member 4 and the outer shell 2, reducing the risk of the electrode terminal 3 detaching from the outer shell 2, and improving the reliability of the battery cell 10.

[0243] In some embodiments, please refer to the following: ​ In conjunction with other accompanying drawings, there are multiple second limiting grooves 301b, which are distributed at intervals along the circumferential Y direction of the lead-out hole 201, and the groove walls on both sides opposite to each other in the circumferential Y direction are gradually tapered towards the outer peripheral wall of the boss 32 in the radial X direction.

[0244] The two opposite sides of the second limiting groove 301b along the circumferential Y direction are the ninth groove wall 3021 and the tenth groove wall 3022, respectively. The limiting member 42 is located between the ninth groove wall 3021 and the tenth groove wall 3022, so as to be limited to the second limiting groove 301b along the circumferential Y direction.

[0245] In the direction of the second limiting groove 301b toward the outer peripheral wall of the boss 32 in the radial X direction, the ninth groove wall 3021 and the tenth groove wall 3022 are gradually narrowed, so that the second limiting groove 301b is designed to be narrowed at the outer peripheral wall of the electrode terminal 3, and both the ninth groove wall 3021 and the tenth groove wall 3022 can achieve radial X limiting of the limiting member 42, that is, the two opposite groove walls of the second limiting groove 301b in the circumferential Y direction can achieve radial XX limiting of the limiting member 42.

[0246] In some embodiments, the second limiting groove 301b is provided with the groove walls on both sides opposite to each other in the axial Z direction gradually tapering towards the outer peripheral wall of the boss 32 in the radial X direction.

[0247] With this configuration, the second limiting groove 301b can be designed to taper towards the outer peripheral wall of the electrode terminal 3 in the radial direction X. This allows the second limiting groove 301b to achieve radial X-limiting of the limiting member 42 on both sides of the groove wall opposite to the axial direction Z.

[0248] By adopting the above technical solution, the limiting strength of the second limiting groove 301b on the limiting member 42 in the radial X direction can be improved, thereby increasing the bonding strength between the electrode terminal 3 and the first insulating member 4 and reducing the risk of the electrode terminal 3 falling off the housing 2.

[0249] In some embodiments, the fifth dimension of the second limiting groove 301b is [0.6, 0.9] * the sixth dimension of the second limiting groove 301b. Wherein, the fifth dimension is the axial dimension of one end of the second limiting groove 301b located on the outer peripheral wall of the boss 32, and the sixth dimension is the axial dimension of the end of the second limiting groove 301b located radially away from the outer peripheral wall of the boss 32.

[0250] That is, the fifth dimension is greater than or equal to 0.6 * the sixth dimension, and the fifth dimension is less than or equal to 0.9 * the sixth dimension.

[0251] This configuration allows the limiting member 42 to be effectively confined within the second limiting groove 301b along the radial direction X. Furthermore, the opening of the second limiting groove 301b at the outer peripheral wall of the boss 32 is arranged to be too small, facilitating the entry of the limiting member 42 into the second limiting groove 301b.

[0252] In some embodiments, please refer to the following: ​ and ​ Furthermore, in conjunction with other accompanying drawings, the seventh dimension L5 of the second limiting groove 301b is [0.6, 0.9] * the eighth dimension L6 of the second limiting groove 301b. Wherein, the seventh dimension L5 is the circumferential dimension of one end of the second limiting groove 301b located on the outer peripheral wall of the boss 32, and the eighth dimension L6 is the circumferential dimension of the end of the second limiting groove 301b located radially away from the outer peripheral wall of the boss 32.

[0253] Understandably, the seventh dimension L5 ≥ 0.6 * the eighth dimension L6, and the seventh dimension L5 ≤ 0.9 * the eighth dimension L6.

[0254] This configuration allows the limiting member 42 to be effectively confined within the second limiting groove 301b along the radial direction X. Furthermore, the opening of the second limiting groove 301b at the outer peripheral wall of the boss 32 is arranged to be too small, facilitating the entry of the limiting member 42 into the second limiting groove 301b.

[0255] For ease of description, the axial dimension of boss 32 is set to the ninth dimension L7.

[0256] In some embodiments, please refer to the following:​ and ​ And in conjunction with other accompanying figures. ​ This is a cross-sectional view of the electrode terminal 3 of the battery cell 10 provided in some embodiments of this application. ​ for ​ A magnified view of point P in the middle. Among them, ​ and ​ The electrode terminal 3 shown is the positive electrode terminal 3a. The electrode terminal 3 includes the positive electrode terminal 3a, and the limiting groove 301 of the positive electrode terminal 3a is provided on the boss 32. The axial dimension of the limiting groove 301 of the positive electrode terminal 3a is [1 / 3, 2 / 3] * the axial dimension of the boss 32.

[0257] For ease of description, the axial dimension of the limiting groove 301 of the positive electrode terminal 3a is set to the tenth dimension L8.

[0258] When the first segment 3011 and the second segment 3012 of the limiting groove 301 are distributed along the radial direction X, the tenth dimension L8 = max(axial dimension of the first segment 3011, axial dimension of the second segment 3012). For example, as... ​ and ​ As shown, the second groove segment 3012 protrudes from the first groove segment 3011 along the axial direction Z, such that max(axial dimension of the first groove segment 3011, axial dimension of the second groove segment 3012) = axial dimension of the second groove segment 3012, that is, the tenth dimension L8 is the axial dimension of the second groove segment 3012.

[0259] When the first groove segment 3011 and the second groove segment 3012 of the limiting groove 301 are distributed along the axial direction Z, the tenth dimension L8 is the sum of the axial dimensions of the first groove segment 3011 and the second groove segment 3012.

[0260] Understandably, the tenth dimension L8 ≥ 1 / 3 * the axial dimension of boss 32, and the tenth dimension L8 ≤ 2 / 3 * the axial dimension of boss 32.

[0261] This configuration ensures that the limiting groove 301 occupies a suitable size ratio to the boss 32 of the positive electrode terminal 3a in the axial Z direction. This allows the limiting groove 301 to effectively limit the limiting member 42 while also ensuring the structural strength and current carrying capacity of the boss 32 to a certain extent.

[0262] In some embodiments, please refer to the following: ​ and ​And in conjunction with other accompanying drawings. Electrode terminal 3 includes negative electrode terminal 3b, and negative electrode terminal 3b further includes composite layer 33. The material of composite layer 33 is different from that of terminal body 31, but the same as that of boss 32. Composite layer 33 is disposed between terminal body 31 and boss 32. The radial dimension of composite layer 33 is larger than that of boss 32, and composite layer 33 covers lead-out hole 201.

[0263] Understandably, the terminal body 31, the composite layer 33, and the boss 32 are distributed sequentially along the Z-axis.

[0264] The composite layer 33 and the boss 32 are made of the same material, while the composite layer 33 and the terminal body 31 are made of different materials, making the negative electrode terminal 3b a composite electrode post made of different materials. As an example, the terminal body 31 is made of aluminum and forms the outer electrode post of the negative electrode terminal 3b; the composite layer 33 and the boss 32 are made of the same material, both of which are copper, and form the inner electrode post of the electrode terminal 3.

[0265] By making the radial dimension of the composite layer 33 larger than that of the boss 32, on the one hand, the composite strength between the outer and inner electrode posts can be improved, reducing the risk of the terminal body 31 detaching from the housing 2. On the other hand, by making the composite layer 33 cover the lead hole 201, the sealing ring 8 can seal the connection between the negative electrode terminal 3b and the housing 2 along the axial direction Z between the composite layer 33 and the housing 2, effectively mitigating the problem of electrolytes and other substances in the housing 2 damaging the composite interface between the composite layer 33 and the terminal body 31, and helping to protect and maintain the structural strength of the electrode terminal 3 to a certain extent.

[0266] Furthermore, the protrusion 32 allows the sealing ring 8 to be fitted around the outer periphery of the protrusion 32 and sealed axially between the composite layer 33 and the outer shell 2. This extends the distance between the welding position of the electrode terminal 3 and the sealing ring 8, thus mitigating the problem of rapid heat transfer to the sealing ring 8 during welding, which could damage the sealing ring 8.

[0267] It should be noted that the limiting groove 301 of the negative electrode terminal 3b can be provided on the boss 32, or on the boss 32 and the composite layer 33.

[0268] For ease of description, the axial dimension of composite layer 33 is set to the eleventh dimension L9.

[0269] In some embodiments, please refer to the following: ​ , ​ and ​And in conjunction with other accompanying drawings. The axial dimension of the limiting groove 301 of the negative electrode terminal 3b = [1 / 3, 2 / 3] * the sum of the axial dimensions of the boss 32 and the composite layer 33.

[0270] For ease of description, the axial dimension of the limiting groove 301 of the negative electrode terminal 3b is set as the twelfth dimension L10.

[0271] When the first groove segment 3011 and the second groove segment 3012 of the limiting groove 301 are distributed along the radial direction X, the twelfth dimension L10 = max(axial dimension of the first groove segment 3011, axial dimension of the second groove segment 3012). For example, as... ​ As shown, the second groove segment 3012 protrudes from the first groove segment 3011 along the axial direction Z, such that max(axial dimension of the first groove segment 3011, axial dimension of the second groove segment 3012) = axial dimension of the second groove segment 3012, that is, the twelfth dimension L10 is the axial dimension of the second groove segment 3012.

[0272] When the first groove segment 3011 and the second groove segment 3012 of the limiting groove 301 are distributed along the axial direction Z, as follows: ​ As shown, the twelfth dimension L10 is the sum of the axial dimensions of the first slot segment 3011 and the second slot segment 3012. Wherein, ​ In the middle, the twelfth dimension L10 is the fourth dimension L4.

[0273] Understandably, the twelfth dimension L10 ≥ 1 / 3 * the sum of the ninth dimension L7 and the eleventh dimension L9, and the twelfth dimension L10 ≤ 2 / 3 * the sum of the ninth dimension L7 and the eleventh dimension L9.

[0274] This configuration ensures that the limiting groove 301 occupies a suitable size ratio to the boss 32 and composite layer 33 of the negative electrode terminal 3b in the axial Z direction. This allows the limiting groove 301 to effectively limit the limiting member 42 while also ensuring the structural strength and current-carrying capacity of the boss 32 and composite layer 33 to a certain extent.

[0275] In some embodiments, please refer to ​ And in conjunction with other accompanying drawings. The electrode terminal 3 has a welding portion 321 at one end near the electrode assembly 1. Wherein, ​ The welding section 321 is marked with a dashed line.

[0276] Understandably, the end of the electrode terminal 3 closest to the electrode assembly 1 is the first wall 302, and the welding part 321 is a part of the first wall 302.

[0277] The welding part 321 is used for welding the electrode assembly 1; or, the welding part 321 is used for welding the transition structure 7.

[0278] In some embodiments, please refer to ​ In conjunction with other accompanying drawings, in the radial direction X of the lead-out hole 201, the limiting groove 301 protrudes from or is flush with the outer peripheral wall of the electrode terminal 3 away from the groove wall of the weld portion 321.

[0279] Specifically, in the radial direction X, the limiting groove 301 protrudes from or is flush with the outer peripheral wall of the boss 32 away from the boss 32.

[0280] When the limiting groove 301 includes a first groove segment 3011 and a second groove segment 3012, in the radial direction X, the groove wall of the limiting groove 301 away from the outer peripheral wall of the electrode terminal 3 is the fourth groove wall 3016 of the second groove segment 3012.

[0281] Alternatively, in some other embodiments, in the radial X direction of the lead-out hole 201, the welding portion 321 protrudes from the groove wall of the limiting groove 301 away from the outer peripheral wall of the electrode terminal 3, and in the axial Z direction, the distance between the limiting groove 301 and the groove wall near the welding portion 321 and the welding portion 321 is ≥1mm.

[0282] Specifically, in the radial direction X, the welded part 321 protrudes from the outer peripheral wall of the boss 32, away from the outer peripheral wall of the limiting groove 301.

[0283] When the limiting groove 301 includes a first groove segment 3011 and a second groove segment 3012, in the radial direction X, the groove wall of the limiting groove 301 that is away from the outer peripheral wall of the boss 32 is the fourth groove wall 3016 of the second groove segment 3012.

[0284] Specifically, when the second groove segment 3012 extends beyond the first groove segment 3011 along the axial direction Z toward the electrode terminal 3, the groove wall of the limiting groove 301 near the welding part 321 in the axial direction Z is the fifth groove wall 3017 of the second groove segment 3012; when the second groove segment 3012 extends beyond the first groove segment 3011 away from the electrode terminal 3 along the axial direction Z, the groove wall of the limiting groove 301 near the welding part 321 in the axial direction Z is the sixth groove wall 3018 of the second groove segment 3012.

[0285] In the axial direction Z, the distance between the limiting groove 301 and the groove wall near the welding part 321 and the welding part 321 is the first distance, which is ≥1mm. Specifically, it can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, etc.

[0286] This configuration improves the problem of the limiting groove 301 being damaged during the welding process when the adapter structure 7 or electrode assembly 1 is welded to the welding part 321. It can ensure the smooth progress of the welding work of the welding part 321 to a certain extent, and the limiting groove 301 can effectively limit the limiting member 42.

[0287] In some embodiments, in the radial direction X of the lead-out hole 201, the welding portion 321 protrudes from the groove wall of the limiting groove 301 away from the outer peripheral wall of the electrode terminal 3, and in the axial direction Z, the distance between the end of the limiting groove 301 near the welding portion 321 and the welding portion 321 ranges from 1.5 mm to 3.5 mm.

[0288] That is, the range of the first distance is 1.5mm to 3.5mm, specifically 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.7mm, 3mm, 3.3mm, 3.5mm, etc.

[0289] This arrangement ensures that, in the axial direction Z, the limiting groove 301 has a suitable distance between the end near the welding part 321 and the welding part 321. This not only improves the problem of the limiting groove 301 being damaged during the welding process, but also allows the limiting groove 301 to occupy a suitable size proportion of the electrode terminal 3 in the axial direction Z, so that the limiting groove 301 can effectively limit the limiting member 42.

[0290] In some embodiments, please refer to the following: ​ and ​ In conjunction with other accompanying drawings, the first insulating member 4 also includes a connector 43, which surrounds the outer periphery of the boss 32 and connects the connector 43 and the insulating body 41.

[0291] The connector 43 is part of the structure of the first insulating member 4 and has insulating properties.

[0292] The connector 43 is arranged around the outer periphery of the boss 32 and connects the connector 43 and the insulating body 41, such that the connector 43 is located between the inner peripheral wall of the lead-out hole 201 and the outer peripheral wall of the boss 32. In this way, the connector 43 can not only realize the connection between the limiting member 42 and the insulating body 41, but also realize the insulation effect between the outer shell 2 and the boss 32, thereby helping to improve the reliability of the battery cell 10.

[0293] In some embodiments, the first insulating member 4 is injection molded and connected to the electrode terminal 3.

[0294] Understandably, the first insulating element 4 is connected to the electrode terminal 3 by injection molding.

[0295] This configuration allows the limiting member 42 of the first insulating member 4 to fully enter the limiting groove 301, thereby forming a very reliable and stable limiting relationship with the limiting groove 301. This improves the bonding strength between the electrode terminal 3 and the first insulating member 4, reducing the risk of the electrode terminal 3 detaching from the housing 2.

[0296] In some embodiments, please refer to the following: ​ And in conjunction with other accompanying drawings. The battery cell 10 also includes a second insulating member 6 and a fixing member 5. The second insulating member 6 is sleeved on the outer periphery of the electrode terminal 3. The fixing member 5 is sleeved on the outer periphery of the electrode terminal 3, and the second insulating member 6 is connected to the fixing member 5 and separates the fixing member 5 from the electrode terminal 3. The fixing member 5 is connected to the outer casing 2.

[0297] The second insulating component 6 refers to a component with insulating properties. The material of the second insulating component 6 may be, but is not limited to, plastic.

[0298] The fastener 5 refers to the component used to fix the electrode terminal 3 to the housing 2, and may be, but is not limited to, metal.

[0299] The second insulating member 6 is sleeved around the outer periphery of the electrode terminal 3, and the fixing member 5 is sleeved around the outer periphery of the electrode terminal 3. The second insulating member 6 connects the electrode terminal 3 and the fixing member 5, thus enabling the second insulating member 6 to not only connect the fixing member 5 and the electrode terminal 3, but also to insulate them from each other. Therefore, the installation of the second insulating member 6 and the fixing member 5 achieves an insulated connection between the electrode terminal 3 and the outer shell 2.

[0300] Specifically, the second insulating member 6 is sleeved on the outer periphery of the terminal body 31, and the fixing member 5 is sleeved on the outer periphery of the fixing member 5.

[0301] Please see ​ The battery 100 provided in this embodiment includes a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the above embodiments; please refer to the relevant descriptions of the battery cell 10 in the above embodiments for details, which will not be repeated here.

[0302] The battery 100 provided in this application embodiment, by adopting the battery cell 10 involved in the above embodiments, can reduce the risk of the electrode terminal 3 detaching from the casing 2, improve the reliability of the battery cell 10, and thus improve the reliability of the battery 100.

[0303] Please see ​ The power-consuming device provided in this application embodiment includes a battery 100. The battery 100 in this embodiment is the same as the battery 100 in the above embodiments; please refer to the relevant descriptions of the battery 100 in the above embodiments for details, which will not be repeated here.

[0304] The electrical device provided in this application, by employing the battery 100 involved in the above embodiments, can improve the stability and reliability of the battery 100, thereby helping to improve the reliability of the electrical device.

[0305] As one embodiment of this application, such as​ As shown, the battery cell 10 includes a housing 2, an electrode assembly 1, an electrode terminal 3, a first insulating member 4, a second insulating member 6, and a fixing member 5. The electrode assembly 1 is disposed inside the housing 2, and the housing 2 has a lead-out hole 201. The electrode terminal 3 includes a terminal body 31 and a boss 32, with the boss 32 disposed at one end of the terminal body 31 along the Z-axis near the electrode assembly 1. The terminal body 31 covers the lead-out hole 201, and the second insulating member 6 is sleeved on the outer periphery of the terminal body 31. The fixing member 5 is sleeved on the outer periphery of the terminal body 31 and connected to the housing 2. The second insulating member 6 connects the terminal body 31 and the fixing member 5 to separate the terminal body 31 and the fixing member 5. The boss 32 passes through the lead-out hole 201. The boss 32 has a limiting groove 301, which is generally annular. The limiting groove 301 includes a first groove segment 3011 and a second groove segment 3012 communicating with the first groove segment 3011. The first groove segment 3011 and the second groove segment 3012 are distributed approximately along the radial direction X. The first groove segment 3011 is provided on the outer peripheral wall of the boss 32. The second insulating member 6 includes an insulating body 41, a connector 43, a first limiting part 421 and a second limiting part 422. The connector 43 is connected to the insulating body 41, the first limiting part 421 is connected to the connector 43, and the second limiting part 422 is connected to the first limiting part 421. The insulating body 41 is disposed between the outer shell 2 and the electrode assembly 1. The connector 43 is sleeved on the outer periphery of the boss 32. The first limiting part 421 is limited along the axial direction Z within the first groove segment 3011, and the second limiting part 422 is limited along the axial direction Z and the radial direction X within the second groove segment 3012.

[0306] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized by, The electrode terminal comprises: a terminal body connected to the shell and covering the lead-out hole; a boss provided at one end of the terminal body close to the electrode assembly and penetrating into the lead-out hole; the boss is connected to the electrode assembly, and at least part of the limiting slot is provided on the boss. At least one of the limiting slots is a first limiting slot, the first limiting slot comprises a first slot segment and a second slot segment communicated with the first slot segment; the limiting member comprises a first limiting part and a second limiting part connected to the first limiting part, at least one of the first limiting part and the second limiting part is connected to the insulating body; the first limiting part is limited in the first slot segment along the axial direction, and the second limiting part is limited in the second slot segment along the radial direction of the lead-out hole. In the axial direction, the second slot segment protrudes from at least one side of the first slot segment.

2. The battery cell of claim 1, wherein, The number of limiting slots is multiple, and multiple limiting slots are distributed along the circumferential direction of the lead-out hole; The first limiting part is limited in the first slot segment along the circumferential direction, and / or the second limiting part is limited in the second slot segment along the circumferential direction. In the circumferential direction, the second slot segment protrudes from at least one side of the first slot segment.

3. The battery cell according to claim 1 or 2, characterized in that, The electrode terminal comprises a terminal body and a boss; the terminal body is connected to the shell and covers the lead-out hole; the boss is provided at one end of the terminal body close to the electrode assembly and penetrates into the lead-out hole; the boss is connected to the electrode assembly, the first slot segment is provided on the outer peripheral wall of the boss, and at least part of the second slot segment is provided on the boss.

4. The battery cell of claim 3, wherein, The second limiting part is also limited in the second slot segment along the axial direction.

5. The battery cell according to claim 3 or 4, characterized in that The first size of the boss = [1 / 3, 2 / 3] * the second size of the boss; Wherein, the first size is the distance between the slot wall close to the outer peripheral wall of the boss and the outer peripheral wall of the boss in the radial direction; the second size is the distance between the slot wall away from the outer peripheral wall of the boss and the outer peripheral wall of the boss in the radial direction.

6. The battery cell of claim 5, wherein, The second slot segment is provided at one end of the electrode terminal close to the electrode assembly along the axial direction.

7. The battery cell of any one of claims 3-6, wherein, The first slot segment and the second slot segment are distributed along the axial direction, and the first limiting part is also limited in the first slot segment along the radial direction.

8. The battery cell of claim 7, wherein, The third size of the electrode terminal = [1 / 3, 2 / 3] * the fourth size of the electrode terminal; 9. The battery cell according to claim 7 or 8, characterized in that, ​ ​ 10. The battery cell of any one of claims 3-9, wherein, ​ 11. The battery cell of claim 10, wherein, ​ 12. The battery cell according to claim 10 or 11, characterized in that ​ The third dimension is the distance between the slot wall close to the electrode assembly and the end of the electrode terminal close to the electrode assembly in the axial direction; and the fourth dimension is the distance between the slot wall away from the electrode assembly and the end of the electrode terminal close to the electrode assembly in the axial direction.

13. The battery cell of any one of claims 2-12, wherein, The at least one limiting slot is a second limiting slot, which is arranged on the outer peripheral wall of the boss; and in the radial direction of the lead-out hole, the cross-sectional area of the second limiting slot perpendicular to the radial direction is arranged to gradually decrease towards the outer peripheral wall of the boss.

14. The battery cell of claim 13, wherein, The axial dimension of the second limiting slot is arranged to gradually decrease towards the outer peripheral wall of the boss along the radial direction. The number of the second limiting slots is multiple, the multiple second limiting slots are arranged to be spaced apart along the circumferential direction of the lead-out hole, and the circumferential dimension of the second limiting slot is arranged to gradually decrease towards the outer peripheral wall of the boss along the radial direction.

15. The battery cell according to claim 13 or 14, characterized in that The two side walls of the second limiting slot opposite in the axial direction are arranged to gradually taper towards the outer peripheral wall of the boss along the radial direction. The number of the second limiting slots is multiple, the multiple second limiting slots are arranged to be spaced apart along the circumferential direction of the lead-out hole, and the two side walls of the second limiting slot opposite in the circumferential direction are arranged to gradually taper towards the outer peripheral wall of the boss along the radial direction.

16. The battery cell of any one of claims 13-15, wherein, The fifth dimension of the second limiting slot = [0.6, 0.9] * the sixth dimension of the second limiting slot; The fifth dimension is the axial dimension of the second limiting slot at the end of the outer peripheral wall of the boss, and the sixth dimension is the axial dimension of the second limiting slot away from the end of the outer peripheral wall of the boss along the radial direction.

17. The battery cell of any of claims 13-16, wherein, The seventh dimension of the second limiting slot = [0.6, 0.9] * the eighth dimension of the second limiting slot; The seventh dimension is the circumferential dimension of the second limiting slot at the end of the outer peripheral wall of the boss, and the eighth dimension is the circumferential dimension of the second limiting slot away from the end of the outer peripheral wall of the boss along the radial direction.

18. The battery cell of any one of claims 2-17, wherein, The electrode terminal includes a positive electrode terminal, the limiting slot of the positive electrode terminal is arranged on the boss, and the axial dimension of the limiting slot of the positive electrode terminal = [1 / 3, 2 / 3] * the axial dimension of the boss.

19. The battery cell of any one of claims 2-18, wherein, The electrode terminal includes a negative electrode terminal, the negative electrode terminal further includes a composite layer, the material of the composite layer is different from the material of the terminal body and the same as the material of the boss; the composite layer is arranged between the terminal body and the boss, the radial dimension of the composite layer is greater than the radial dimension of the boss, and the composite layer covers the lead-out hole.

20. The battery cell of claim 19, wherein, The axial dimension of the limiting slot of the negative electrode terminal = [1 / 3, 2 / 3] * the sum of the axial dimensions of the boss and the composite layer.

21. The battery cell of any one of claims 1-20, wherein, The end of the electrode terminal close to the electrode assembly is provided with a welding portion. In the radial direction of the lead-out hole, the limiting groove is projected from the groove wall of the outer peripheral wall of the electrode terminal away from the welding portion, or in the radial direction of the lead-out hole, the welding portion is projected from the groove wall of the limiting groove of the outer peripheral wall of the electrode terminal away from the welding portion, and in the axial direction, the distance between the groove wall of the limiting groove close to the welding portion and the welding portion is greater than or equal to 1 mm.

22. The battery cell of claim 21, wherein, In the radial direction of the lead-out hole, the welding portion is projected from the groove wall of the limiting groove of the outer peripheral wall of the electrode terminal away from the welding portion, and in the axial direction, the distance between the one end of the limiting groove close to the welding portion and the welding portion ranges from 1.5 mm to 3.5 mm.

23. The battery cell of any one of claims 2-22, wherein, The first insulating member further comprises a connecting member, which is arranged around the outer periphery of the boss and is connected between the connecting member and the insulating body.

24. The battery cell of any one of claims 1-23, wherein, The first insulating member is injection-molded to the electrode terminal.

25. The battery cell of any one of claims 1-24, wherein, The battery cell further comprises: a second insulating member, which is sleeved on the outer periphery of the electrode terminal; a fixing member, which is sleeved on the outer periphery of the electrode terminal, and the second insulating member is connected to the fixing member and separates the fixing member and the electrode terminal; and the fixing member is connected to the shell.

26. A battery, comprising: The battery cell according to any one of claims 1-25.

27. An electrical device, comprising: The battery according to claim 26.

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