Battery cell, battery, and electric device

Abstract

The present application is applicable to the technical field of batteries (100), and provides a battery cell (10), a battery (100) and an electric device. The electric device comprises the battery (100). The battery (100) comprises the battery cell (10). The battery cell (10) comprises a casing (2), an electrode assembly (1), an electrode terminal (3) and a first insulating member (4). The casing (2) is provided with a lead-out hole (201); the electrode assembly (1) is arranged in the casing (2); the electrode terminal (3) passes through the lead-out hole (201) or is arranged opposite to the lead-out hole (201); the electrode terminal (3) is connected to the casing (2) and the electrode assembly (1), and is provided with a limiting groove (301); the first insulating member (4) comprises an insulating body (41) and a limiting member (42) connected to the insulating body (41); the insulating body (41) is arranged between the casing (2) and the electrode assembly (1); the limiting member (42) is inserted into the limiting groove (301), and forms positional limitation with the limiting groove (301) in the axial direction (Z) of the lead-out hole. By inserting the limiting member (42) of the first insulating member (4) into the limiting groove (301) of the electrode terminal (3), positional limitation in the axial direction (Z) between the first insulating member (4) and the electrode terminal (3) is achieved, thereby improving the bonding strength between the electrode terminal (3) and the casing (2). In this way, the risk of the electrode terminal (3) coming off the casing (2) can be reduced, improving the reliability of the battery cell (10).

Description

Battery cell, battery and electric device

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202411238138.5, filed on September 4, 2024, and entitled "Battery cell, battery and electric device", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0004] In the related art, the battery cell 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.

[0005] In the process of charging and discharging cycle, collision test and the like of the battery cell, the electrode terminal will be subjected to extrusion and the like 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

[0006] In view of the above problems, the purpose of the embodiments of the present application is to provide a battery cell, a battery and an electric device, which can improve the technical problem that the electrode terminal is easily separated from the shell.

[0007] The technical solution adopted by the embodiments of the present application is:

[0008] In a first aspect, the embodiments of the present application provide a battery cell, comprising:

[0009] a shell provided with a lead-out hole;

[0010] an electrode assembly arranged in the shell;

[0011] an electrode terminal arranged in the lead-out hole or 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;

[0012] 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 the limiting groove and the limiting member form a limit in the axial direction of the lead-out hole.

[0013] The battery cell provided by the embodiments of the present application is characterized in that the insulating body of the first insulating piece is arranged between the shell and the electrode assembly, the limiting piece of the first insulating piece is inserted into the limiting groove of the electrode terminal, and the limiting groove is limited in the axial direction of the electrode terminal, so that the first insulating piece and the electrode terminal are limited in the axial direction, which makes the first insulating piece and the electrode terminal have a high bonding strength, thereby improving the bonding strength of the electrode terminal and the shell. In this way, the risk of the electrode terminal being pulled out of the shell is reduced, and the reliability of the battery cell is improved.

[0014] In some embodiments, the electrode terminal comprises:

[0015] The terminal body is connected to the shell and covers the lead-out hole.

[0016] The boss is arranged at one end of the terminal body close to the electrode assembly and is inserted into 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.

[0017] By arranging the boss on the electrode terminal and inserting it into the lead-out hole, 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 piece of the first insulating piece and the limiting groove to form a limit 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.

[0018] In some embodiments, the at least one limiting groove is a first limiting groove, the first limiting groove comprises a first groove segment and a second groove segment connected to the first groove segment; the limiting piece 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 axial direction in the first groove segment, and the second limiting part is limited in the radial direction of the lead-out hole in the second groove segment.

[0019] By using the above technical solution, the limiting piece can be limited in the limiting groove in the axial and radial directions, 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, thereby improving the reliability of the battery cell.

[0020] In some embodiments, in the axial direction, the second groove segment protrudes from at least one side of the first groove segment.

[0021] The second slot section protrudes from at least one side of the first slot section in the axial direction, so that the second slot section can be used to limit the second limiting part in the radial direction, thereby improving the bonding strength of the first insulating part and the electrode terminal, and further improving the bonding strength of the electrode terminal and the shell, which helps to reduce the risk of the electrode terminal being pulled out of the shell, and improves the reliability of the battery cell.

[0022] In some embodiments, the number of limiting grooves is multiple, and the multiple limiting grooves are distributed in the circumferential direction of the lead-out hole.

[0023] The first limiting part is limited in the circumferential direction in the first slot section, and / or the second limiting part is limited in the circumferential direction in the second slot section.

[0024] In this way, the bonding strength of the first insulating part and the electrode terminal can be improved to improve the bonding strength of the electrode terminal and the shell, which helps to reduce the risk of the electrode terminal being pulled out of the shell, and improves the reliability of the battery cell.

[0025] In some embodiments, in the circumferential direction, the second slot section protrudes from at least one side of the first slot section.

[0026] The second slot section protrudes from at least one side of the first slot section in the circumferential direction, so that the second slot section can be used to limit the second limiting part in the radial direction, thereby improving the bonding strength of the first insulating part and the electrode terminal, and further improving the bonding strength of the electrode terminal and the shell, which helps to reduce the risk of the electrode terminal being pulled out of the shell, and improves the reliability of the battery cell.

[0027] In some embodiments, the electrode terminal includes 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 penetrates into 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.

[0028] By adopting the above technical solution, at least part of the first insulating part can be arranged on the outer peripheral side of the boss, so that the first insulating part not only realizes the insulation between the shell and the electrode assembly, but also realizes the insulation between the boss and the shell, which helps to improve the reliability of the battery cell.

[0029] In some embodiments, the second limiting part is also limited in the axial direction in the second slot section.

[0030] In this way, the second limiting part is limited in the radial direction and the axial direction in the second slot section, respectively. In this way, the limiting strength of the limiting part and the limiting groove in the axial direction can be improved, thereby improving the bonding strength of the first insulating part and the electrode terminal, and further improving the bonding strength of the electrode terminal and the shell, which helps to reduce the risk of the electrode terminal being pulled out of the shell, and improves the reliability of the battery cell.

[0031] In some embodiments, the first size of the boss = [1 / 3, 2 / 3] * the second size of the boss.

[0032] The first dimension is the distance between the groove wall close to the outer peripheral wall of the boss and the outer peripheral wall of the boss in the radial direction; and the second dimension is the distance between the groove wall away from the outer peripheral wall of the boss and the outer peripheral wall of the boss in the radial direction.

[0033] In this way, on the one hand, the limiting groove does not excessively occupy the volume of the boss, so as 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 effect on the second limiting part in the radial direction, so as to improve the limiting strength of the limiting member and the limiting groove in the radial direction, so as to improve the combination strength of the first insulating member 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.

[0034] In some embodiments, the second groove segment is arranged at one end of the electrode terminal close to the electrode assembly in the axial direction.

[0035] By adopting the above technical scheme, the limiting member and the limiting groove are conveniently plugged and fitted.

[0036] In some embodiments, the first groove segment and the second groove segment are distributed in the axial direction, and the first limiting part is further limited in the radial direction in the first groove segment.

[0037] In this way, the limiting strength of the limiting member and the limiting groove in the axial direction can be improved, so as to improve the combination strength of the first insulating member 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 third dimension of the electrode terminal = [1 / 3, 2 / 3] * the fourth dimension of the electrode terminal.

[0039] The third dimension is the distance between the groove 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 groove wall away from the electrode assembly and the end of the electrode terminal close to the electrode assembly in the axial direction.

[0040] In this way, on the one hand, the limiting groove does not excessively occupy the volume of the electrode terminal, so as to guarantee the structural strength and flow capacity of the electrode terminal to a certain extent. On the other hand, the stepped structure can realize relatively firm limiting effect on the first limiting part in the axial direction, so as to improve the limiting strength of the limiting member and the limiting groove in the radial direction, so as to improve the combination strength of the first insulating member 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.

[0041] In some embodiments, the at least one limiting groove is a second limiting groove, and the second limiting groove is arranged on the outer circumferential 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 arranged to gradually decrease towards the outer circumferential wall of the boss.

[0042] In this way, the groove wall of the second limiting groove can achieve radial limiting on the limiting member. In this way, the first limiting groove and the limiting member can not only achieve limiting in the axial direction, but also achieve limiting in the radial direction. This helps to improve the bonding strength between the electrode terminal and the first insulating member, to improve the bonding strength of the first insulating member and the electrode terminal, and to help reduce the risk of the electrode terminal being pulled out of the shell, thereby improving the reliability of the battery cell.

[0043] In some embodiments, the axial dimension of the second limiting groove is arranged to gradually decrease along the radial direction towards the outer circumferential wall of the boss;

[0044] And / or, the number of second limiting grooves is a plurality, and the plurality of second limiting grooves are arranged to be spaced apart along the circumferential direction of the lead-out hole, and the circumferential dimension of the second limiting groove is arranged to gradually decrease along the radial direction towards the outer circumferential wall of the boss.

[0045] By adopting the above technical solution, the cross-sectional area of the second limiting groove perpendicular to the radial direction can be arranged to gradually decrease in the direction of the second limiting groove along the radial direction towards the outer circumferential wall of the boss, so that the groove wall of the second limiting groove can achieve radial limiting on the limiting member.

[0046] In some embodiments, the groove walls on the two axially opposite sides of the second limiting groove are arranged to taper along the radial direction towards the outer circumferential wall of the boss;

[0047] And / or, the number of second limiting grooves is a plurality, and the plurality of second limiting grooves are arranged to be spaced apart along the circumferential direction of the lead-out hole, and the groove walls on the two circumferentially opposite sides of the second limiting groove are arranged to taper along the radial direction towards the outer circumferential wall of the boss.

[0048] By adopting the above technical solution, 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.

[0049] In some embodiments, the fifth dimension of the second limiting groove = [0.6, 0.9] * the sixth dimension of the second limiting groove;

[0050] Wherein, the fifth dimension is the axial dimension of the second limiting groove at one end of the outer circumferential wall of the boss, and the sixth dimension is the axial dimension of the second limiting groove away from one end of the outer circumferential wall of the boss along 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 circumferential wall of the boss is arranged to be too small, which facilitates the limiting member to enter the second limiting groove.

[0052] In some embodiments, the seventh dimension of the second limiting groove = [0.6, 0.9] * the eighth dimension of the second limiting groove.

[0053] 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.

[0054] 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 arranged to be too small, facilitating the entry of the limiting member into the second limiting groove.

[0055] 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.

[0056] In this way, the limiting groove occupies a relatively appropriate size proportion of the boss of the positive electrode terminal in the axial direction, so that the limiting groove can effectively limit the limiting member, and at the same time, the structural strength and flow capacity of the boss can be ensured to a certain extent.

[0057] In some embodiments, 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 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.

[0058] 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 on the basis of sealing the connection between the negative electrode terminal and the shell by the sealing ring, the sealing ring can be sealed between the composite layer and the shell in the axial direction, thereby effectively improving the problem that the electrolyte in the shell destroys the composite interface between the composite layer and the terminal body, and helping to ensure and maintain the structural strength of the electrode terminal to a certain extent.

[0059] 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.

[0060] In this way, the limiting groove occupies a relatively appropriate size proportion 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 at the same time, the structural strength and flow capacity of the boss and the composite layer can be ensured to a certain extent.

[0061] In some embodiments, the electrode terminal is provided with a welding portion near one end of the electrode assembly;

[0062] In the radial direction of the lead-out hole, the limiting groove protrudes from or is flush with the groove wall of the outer peripheral wall away from the electrode terminal; or, in the radial direction of the lead-out hole, the welding portion protrudes from the groove wall of the outer peripheral wall of the limiting groove away from the electrode terminal, and in the axial direction, the distance between the groove wall near the welding portion and the welding portion is ≥1mm.

[0063] In this way, when the adapter structure or the electrode assembly is welded to the welding portion, the problem of the limiting groove being 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.

[0064] In some embodiments, in the radial direction of the lead-out hole, the welding portion protrudes from the groove wall of the outer peripheral wall of the limiting groove away from the electrode terminal, and in the axial direction, the distance between the end near the welding portion and the welding portion is in the range of 1.5mm-3.5mm.

[0065] In this way, in the axial direction, the limiting groove has a suitable distance between the end near the welding portion and the welding portion, which can improve the problem of the limiting groove being damaged during welding on the one hand, and on the other hand, the limiting groove can occupy a suitable size proportion of the electrode terminal in the axial direction, so that the limiting groove can effectively limit the limiting member.

[0066] 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.

[0067] 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 realizes the connection between the limiting member and the insulating body, but also realizes the insulation effect between the shell and the boss, thereby helping to improve the reliability of the battery monomer.

[0068] In some embodiments, the first insulating member is injection molded to the electrode terminal.

[0069] 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 coming off the shell.

[0070] In some embodiments, the battery monomer further comprises:

[0071] A second insulating member is sleeved on the outer periphery of the electrode terminal;

[0072] The fixing member 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; the fixing member is connected to the shell.

[0073] By means of the second insulating member and the fixing member, the insulating connection between the electrode terminal and the shell is achieved.

[0074] In a second aspect, the embodiments of the present application provide a battery, including a battery cell.

[0075] The battery provided by the embodiments of the present application can reduce the risk of electrode terminal disengagement from the shell, improve the reliability of the battery cell, and thus improve the reliability of the battery.

[0076] In a third aspect, the embodiments of the present application provide a power consumption device, including a battery.

[0077] The power consumption device provided by the embodiments of the present application can improve the stability and reliability of the battery, and thus help to improve the reliability of the power consumption device.

[0078] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following will describe the specific embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0079] 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 exemplary technical description, obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0080] FIG. 1 is a schematic diagram of a vehicle provided by some embodiments of the present application;

[0081] FIG. 2 is an exploded view of a battery provided by some embodiments of the present application;

[0082] FIG. 3 is a perspective view of a battery cell provided by some embodiments of the present application;

[0083] FIG. 4 is an exploded view of a battery cell provided by some embodiments of the present application;

[0084] FIG. 5 is an enlarged view of A in FIG. 4;

[0085] FIG. 6 is a partial schematic view of the battery cell provided by FIG. 3;

[0086] FIG. 7 is a sectional view of FIG. 6 along B-B;

[0087] FIG. 8 is an enlarged view of C in FIG. 7;

[0088] FIG. 9 is an enlarged view of D in FIG. 8;

[0089] FIG. 10 is a structural view of an electrode terminal, a second insulating member, and a fixing member of the battery cell provided in FIG. 3;

[0090] FIG. 11 is a sectional view of FIG. 10 along E-E;

[0091] FIG. 12 is an enlarged view of F in FIG. 11;

[0092] FIG. 13 is a partial sectional view of a battery cell provided in another embodiment of the present application;

[0093] FIG. 14 is an enlarged view of G in FIG. 13;

[0094] FIG. 15 is a partial schematic view of a battery cell provided in another embodiment of the present application;

[0095] FIG. 16 is a sectional view of FIG. 15 along H-H;

[0096] FIG. 17 is an enlarged view of I in FIG. 16;

[0097] FIG. 18 is an enlarged view of J in FIG. 17;

[0098] FIG. 19 is an enlarged sectional view of the electrode terminal of FIG. 18;

[0099] FIG. 20 is a sectional view of an electrode terminal of a battery cell provided in still another embodiment of the present application;

[0100] FIG. 21 is an enlarged view of K in FIG. 20;

[0101] FIG. 22 is a partial exploded view of a battery cell provided in still another embodiment of the present application;

[0102] FIG. 23 is an enlarged view of L in FIG. 22;

[0103] FIG. 24 is a fitting schematic view of FIG. 22;

[0104] FIG. 25 is a sectional view of FIG. 24 along M-M;

[0105] FIG. 26 is an enlarged view of N in FIG. 25;

[0106] FIG. 27 is an enlarged view of O in FIG. 26;

[0107] FIG. 28 is an enlarged sectional view of the electrode terminal of FIG. 27;

[0108] FIG. 29 is a structural view of an electrode terminal of a battery cell provided in FIG. 22;

[0109] Fig. 30 is a sectional view of an electrode terminal of a battery cell according to some embodiments of the present application;

[0110] Fig. 31 is an enlarged view of P in Fig. 30.

[0111] In the drawings: 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-battery cell; 20-box body; 210-first part; 220-second part; 1-electrode assembly; 2-outer shell; 201-lead-out hole; 21-shell; 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 part; 33-composite layer; 4-first insulating member; 41-insulating body; 42-limiting member; 421-first limiting part; 422-second limiting part; 43-connecting member; 5-fixing member; 6-second insulating member; 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

[0112] Embodiments of the present application are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0113] All embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions, if not specifically stated.

[0114] All technical features and optional technical features of the embodiments of the present application can be combined with each other to form new technical solutions, if not specifically stated.

[0115] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0116] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0117] In the description of the embodiments of the present application, "a plurality of" means two or more, and "two or more" includes two, unless otherwise explicitly specified and limited. Accordingly, the meaning of "a plurality of groups" is two or more groups, including two groups.

[0118] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0119] In the description of the present application, the term "and / or", only describes the relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent: A exists, A and B exist, and B exist. In addition, in the present application, the character " / ", generally represents that the front and rear associated objects are in an "or" relationship.

[0120] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and equivalent parts can be substituted for the parts therein. In particular, the technical features mentioned in each embodiment can be combined in any way, as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0121] In the related art, the battery monomer includes an electrode assembly, a housing, and an electrode terminal. The electrode assembly is provided in the housing. The electrode terminal is provided on the housing and connected to the electrode assembly.

[0122] In the process of charging and discharging cycle, collision test and the like of the battery monomer, the electrode terminal will be subjected to extrusion and the like 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.

[0123] Based on the above considerations, the battery monomer, the battery and the power utilization device provided by the embodiments of the present application are provided. The insulating body of the first insulating piece is arranged between the shell and the electrode assembly, the limiting piece of the first insulating piece is inserted into the limiting groove of the electrode terminal, and the limiting groove is limited in cooperation with the electrode terminal along the axial direction, so that the first insulating piece and the electrode terminal are limited in the axial direction. In this way, the first insulating piece and the electrode terminal have high bonding strength, and thus the bonding strength of the electrode terminal and the shell can be improved. 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.

[0124] In some embodiments, the battery monomer related to the embodiments of the present application can be used in a power utilization device using the battery monomer or the battery as a power source.

[0125] The power utilization device related to the embodiments of the present application can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, a vehicle, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric aircraft toy and the like. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft and the like. According to the power source, the vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile and the like. According to the driving mode, the vehicle can be a front drive automobile, a rear drive automobile or a four-wheel drive automobile.

[0126] In other embodiments, the battery monomer related to the embodiments of the present application can also be used in an energy storage system using the battery monomer or the battery as an energy storage element. The energy storage system can include an energy storage container, an energy storage cabinet and the like.

[0127] The battery related to the embodiments of the present application can be a single physical module including one or more battery monomers to provide higher voltage and capacity. When there are multiple battery monomers, the multiple battery monomers are connected in series, in parallel or in a mixed manner. The mixed connection means that there are both series connection and parallel connection among the multiple battery monomers.

[0128] In some embodiments, the battery can be a battery module. When there are multiple battery monomers, the multiple battery monomers are arranged and fixed to form a battery module.

[0129] In some embodiments, the battery can be a battery pack, and the battery pack can include a box and battery cells. As an example, the battery cells can be directly accommodated in the box. As an example, the battery cells can also be first formed into a battery module, and then accommodated in the box.

[0130] As an example, the plurality of battery cells can be fixed to form the battery module by a cable tie or the like.

[0131] As an example, the plurality of battery cells can also be fixed to form the battery module by an end plate, a side plate or the like.

[0132] The battery cell involved in the embodiments of the present application refers to the smallest unit for storing and outputting electric 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 in the shape of a cylinder, a flat body, a cuboid or other shapes.

[0133] For ease of description, the embodiments of the present application take a vehicle as an example for description.

[0134] In some embodiments, referring to FIG. 1, FIG. 1 is a schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 is internally provided with the battery 100 described above, and the battery 100 can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0135] In some embodiments, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0136] In some embodiments, referring to FIG. 2, FIG. 2 is an exploded view of the battery 100 provided by some embodiments of the present application. The battery 100 can include a box 20 and battery cells 10. The box 20 is a structure with an internal space, and the internal space of the box 20 is used to accommodate the battery cells 10.

[0137] The box 20 can have various structures. In some embodiments, the box 20 can include a first part 210 and a second part 220, which are coupled to each other and together define an internal space of the box 20. The first part 210 can be a hollow structure having an opening at one end, and the second part 220 can be a plate structure, which is coupled to the opening side of the first part 210 to define the internal space of the box 20 together with the first part 210. Alternatively, referring to FIG. 2, the first part 210 and the second part 220 can both be hollow structures having an opening at one end, and the opening side of the first part 210 is coupled to the opening side of the second part 220 to define the internal space of the box 20 together with the first part 210 and the second part 220. The box 20 formed by the first part 210 and the second part 220 can have various shapes, such as a cylinder, a cuboid, etc.

[0138] In some embodiments, referring to FIG. 2, the plurality of battery cells 10 can be connected in series, in parallel, or in a mixed manner to form a whole, and then the whole formed by the plurality of battery cells 10 is directly accommodated in the internal space of the box 20. In other embodiments, the plurality of battery cells 10 can be connected in series, in parallel, or in a mixed manner, and then arranged and fixed to form a battery module, and the battery module is accommodated in the internal space of the box 20. In yet other embodiments, the plurality of battery cells 10 can be connected in series, in parallel, or in a mixed manner, and then arranged and fixed to form a plurality of battery modules, and the plurality of battery modules are connected in series, in parallel, or in a mixed manner to form a whole, and then accommodated in the internal space of the box 20.

[0139] In some embodiments, the box 20 of the battery 100 can be part of the chassis structure of the vehicle 1000. For example, part of the box 20 can be at least part of the chassis of the vehicle 1000, or part of the box 20 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0140] In some embodiments, referring to FIG. 3 and FIG. 4, FIG. 3 is a perspective view of the battery cell 10 provided in some embodiments of the present application, and FIG. 4 is an exploded view of FIG. 3. The battery cell 10 can include an electrode assembly 1, a case 2, and an electrode terminal 3.

[0141] The electrode assembly 1 is a component in which electrochemical reactions occur in the battery cell 10. Among them, the electrode assembly 1 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a diaphragm is arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a part with active material, which constitutes the main body of the electrode assembly 1, and a part without active material, which respectively constitutes the tab of the positive electrode sheet and the negative electrode sheet. The tab of the positive electrode sheet is the positive electrode tab, and the tab of the negative electrode sheet is the negative electrode tab, and the positive electrode tab and the negative electrode tab can be located at one end of the main body or at opposite ends of the main body.

[0142] In the battery cell 10, the number of electrode assemblies 1 can be one or multiple.

[0143] In some cases, the electrode assembly 1 can also be referred to as a bare cell, a winding body, a stacking body, etc.

[0144] In some embodiments, the battery cell 10 can also include an electrolyte, which plays a role in conducting ions between the positive electrode sheet and the negative electrode sheet. Among them, the electrolyte involved in the embodiments of the present application can be liquid, gel or solid.

[0145] The shell 2 is a structure for defining the internal environment of the battery cell 10. Among them, the shell 2 is used to accommodate the electrode assembly 1 and the electrolyte.

[0146] In some embodiments, please continue to refer to FIG. 3 and FIG. 4, the shell 2 can include a shell body 21 and an end cover 22, which are components for jointly defining the internal environment of the battery cell 10, and the internal environment defined by the shell body 21 and the end cover 22 is used to accommodate the electrode assembly 1 and the electrolyte. Among them, the shell body 21 and the end cover 22 can be independent components. Specifically, as shown in FIG. 3 and FIG. 4, the shell body 21 has an opening, and the end cover 22 is arranged at the opening of the shell body 21 to jointly define the internal environment of the battery cell 10 with the shell body 21, and to isolate the internal environment of the battery cell 10 from the external environment. Alternatively, the shell body 21 and the end cover 22 can also be an integrated structure. Specifically, the end cover 22 and the shell body 21 can form a common connecting surface before the electrode assembly 1 is put into the shell, and when the electrode assembly 1 needs to be packaged after being put into the shell, the end cover 22 is then closed to the shell body 21.

[0147] Among them, the number of end covers 22 can be one, as shown in FIG. 3 and FIG. 4. Alternatively, the number of end covers 22 can also be two, and the two end covers 22 are respectively arranged at opposite ends of the shell body 21.

[0148] Among them, the shell body 21 can be cylindrical, square, etc., which can be determined according to the specific shape and size of the electrode assembly 1. Moreover, the materials of the shell body 21 and the end cover 22 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0149] The electrode terminal 3 refers to a structure with electrically conductive performance. The electrode terminal 3 is arranged on the shell 2 and connected to the electrode assembly 1. The electrode terminal 3 serves as a current transmission end of the battery monomer 10 for transmitting current.

[0150] The electrode terminal 3 is connected to the electrode assembly 1, specifically to the tab of the electrode assembly 1. The electrode terminal 3 and the tab can be directly connected through welding, bonding or the like. Alternatively, as shown in FIG. 4, an adapter structure 7 can be arranged between the electrode terminal 3 and the tab. The adapter structure 7 is connected to the electrode terminal 3 and the tab to realize the adapter between the electrode terminal 3 and the tab to enable current flow, thereby indirectly realizing the connection between the electrode terminal 3 and the tab.

[0151] The adapter structure 7 refers to a metal structure with electrically conductive performance, for example, but not limited to, a copper bar.

[0152] In some embodiments, referring to FIG. 4, the electrode terminal 3 is provided as two, which are a positive electrode terminal 3a and a negative electrode terminal 3b. The positive electrode terminal 3a is in conductive connection with the positive tab of the electrode assembly 1, and the negative electrode terminal 3b is in conductive connection with the negative tab of the electrode assembly 1.

[0153] The electrode terminal 3 can be arranged on the shell body 21 of the shell 2 or on the end cover 22 of the shell 2. The positive electrode terminal 3a and the negative electrode terminal 3b can be arranged on the shell body 21 at the same time. Alternatively, as shown in FIG. 4, the positive electrode terminal 3a and the negative electrode terminal 3b can be arranged on the end cover 22 at the same time. Alternatively, one of the positive electrode terminal 3a and the negative electrode terminal 3b is arranged on the shell body 21, and the other is arranged on the end cover 22.

[0154] As shown in FIG. 4, the positive electrode terminal 3a and the negative electrode terminal 3b can be arranged at the same end of the shell 2. Alternatively, the positive electrode terminal 3a and the negative electrode terminal 3b can be arranged at opposite ends of the shell 2.

[0155] The electrode terminal 3 can be made of metal material, for example, but not limited to, a pole. As an example, the positive electrode terminal 3a is an aluminum pole made of aluminum material, and the negative electrode terminal 3b is a composite pole made of aluminum and copper materials. The part of the negative electrode terminal 3b made of copper material is used to connect with the tab.

[0156] Please refer to FIGS. 4-12, and in combination with other drawings. FIG. 5 is an enlarged view of A in FIG. 4. FIG. 6 is a partial schematic view of the battery cell 10 provided in FIG. 3, in which the battery cell 10 is perpendicular to the axial direction Z. FIG. 7 is a sectional view of FIG. 6 along B-B. FIG. 8 is an enlarged view of C in FIG. 7. FIG. 9 is an enlarged view of D in FIG. 8. FIG. 10 is a structural view of the electrode terminal 3, the second insulating member 6, and the fixing member 5 of the battery cell 10 provided in FIG. 3. FIG. 11 is a sectional view of FIG. 10 along E-E. FIG. 12 is an enlarged view of F in FIG. 11. In FIGS. 8-12, the electrode terminal 3 is a negative electrode terminal 3b. The battery cell 10 provided in the embodiments includes a housing 2, an electrode assembly 1, an electrode terminal 3, and a first insulating member 4. The housing 2 is provided with a lead-out hole 201. The electrode assembly 1 is arranged in the housing 2. The electrode terminal 3 is arranged in the lead-out hole 201, or the electrode terminal 3 is arranged opposite to the lead-out hole 201. The electrode terminal 3 is connected to the housing 2 and the electrode assembly 1, and is provided with 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, and the insulating body 41 is arranged between the housing 2 and the electrode assembly 1. The limiting member 42 is inserted into the limiting groove 301, and the limiting groove 301 and the limiting member 42 form a limit in the axial direction Z of the lead-out hole 201.

[0157] The lead-out hole 201 is a through hole penetrating the wall of the housing 2, and is used for connecting the electrode terminal 3 to the electrode assembly 1 through the lead-out hole 201. In the embodiments, the penetrating direction of the lead-out hole 201 on the housing 2 is the axial direction Z of the lead-out hole 201. Hereinafter, the axial direction Z refers to the axial direction Z of the lead-out hole 201 unless otherwise specified.

[0158] The inner circumferential wall of the lead-out hole 201 extends substantially along the circumferential direction of the lead-out hole 201, and the circumferential direction of the lead-out hole 201 is the circumferential direction Y of the lead-out hole 201, which is perpendicular to the axial direction Z. Hereinafter, the circumferential direction Y refers to the circumferential direction Y of the lead-out hole 201 unless otherwise specified. In the embodiments, the inner contour of the lead-out hole 201 in the cross section perpendicular to the axial direction Z can be circular, square, polygonal, elliptical, or the like.

[0159] The inner circumferential wall of the lead-out hole 201 extends substantially along the circumferential direction Y of the lead-out hole 201, and substantially defines a circle. The radial direction of the circle substantially defined by the inner circumferential wall of the lead-out hole 201 is the radial direction X of the lead-out hole 201. Hereinafter, the radial direction X refers to the radial direction X of the lead-out hole 201 unless otherwise specified.

[0160] In some possible designs, the electrode terminal 3 is arranged in the lead-out hole 201, and at least a part of the electrode terminal 3 is located in the lead-out hole 201, as shown in FIGS. 8 and 9. Alternatively, in other possible designs, the electrode terminal 3 is arranged opposite to the lead-out hole 201 along the axial direction Z. In the embodiments, the electrode terminal 3 can be connected to the electrode assembly 1 through the lead-out hole 201.

[0161] The electrode terminal 3 is connected to the shell 2, specifically, the electrode terminal 3 is insulatedly connected to the shell 2. Wherein, an insulation structure is arranged between the electrode terminal 3 and the shell 2, which can be but is not limited to the second insulation piece 6 referred to below, for realizing insulation between the shell 2 and the electrode terminal 3.

[0162] The electrode terminal 3 is connected to the electrode assembly 1, realizing conduction between the electrode terminal 3 and the electrode assembly 1. Wherein, the electrode terminal 3 can be directly connected to the electrode assembly 1; the electrode terminal 3 and the electrode assembly 1 can also be provided with an adapter structure 7 connected to the electrode terminal 3 and the electrode assembly 1, realizing indirect conduction between the electrode terminal 3 and the electrode assembly 1.

[0163] The limiting groove 301 is a groove on the electrode terminal 3 for limiting the first insulation piece 4.

[0164] The first insulation piece 4 is a component with insulation performance, for realizing insulation effect between the shell 2 and the electrode assembly 1. Wherein, the first insulation piece 4 can be but is not limited to a plastic piece.

[0165] The insulation body 41 is the main part of the first insulation piece 4, and the limiting piece 42 is the part on the first insulation piece 4 for cooperating with the limiting groove 301. Wherein, the insulation body 41 and the limiting piece 42 both have insulation performance.

[0166] The insulation body 41 is arranged between the shell 2 and the electrode assembly 1, specifically, the insulation body 41 is arranged in the shell 2, and is mainly arranged between the shell 2 and the electrode assembly 1, for realizing insulation effect between the shell 2 and the electrode assembly 1.

[0167] The limiting piece 42 is inserted into the limiting groove 301, and the two ends of the limiting piece 42 along the axial direction Z can be respectively correspondingly limited with the two side groove walls of the limiting groove 301 along the axial direction Z, so that the limiting piece 42 can be limited between the two side groove walls of the limiting groove 301 along the axial direction Z, thereby the limiting piece 42 and the limiting groove 301 form limiting in the axial direction Z, and further realize limiting of the first insulation piece 4 and the electrode terminal 3 in the axial direction Z, so as to realize limiting of the electrode terminal 3 and the shell 2 in the axial direction Z.

[0168] The battery monomer 10 provided by the embodiment of the present application is arranged between the shell 2 and the electrode assembly 1 through the insulating body 41 of the first insulating piece 4, the limiting piece 42 of the first insulating piece 4 is inserted into the limiting groove 301 of the electrode terminal 3, and the limiting groove 301 is limited in cooperation with the electrode terminal 3 along the axial direction Z, so that the first insulating piece 4 and the electrode terminal 3 are limited in the axial direction Z, so that the first insulating piece 4 and the electrode terminal 3 have high bonding strength, and the bonding strength of the electrode terminal 3 and the shell 2 can be improved. Therefore, it is helpful to reduce the risk of the electrode terminal 3 being separated from the shell 2, and improve the reliability of the battery monomer 10.

[0169] In some embodiments, please refer to FIGS. 8 to 12, and combine with other drawings. The electrode terminal 3 includes a terminal body 31 and a boss 32. The terminal body 31 is connected to the shell 2 and covers the lead-out hole 201. The boss 32 is arranged at one end of the terminal body 31 close to the electrode assembly 1 and is arranged in the lead-out hole 201. The boss 32 is connected to the electrode assembly 1, and at least part of the limiting groove 301 is arranged on the boss 32.

[0170] The terminal body 31 and the boss 32 are two parts of the electrode terminal 3 and both have electric conductivity. In the axial direction Z, the terminal body 31 is arranged at one end of the lead-out hole 201 away from the electrode assembly 1, and the boss 32 is arranged at one end of the terminal body 31 close to the electrode assembly 1. The radial dimension of the terminal body 31 is greater than that of the boss 32, so that the terminal body 31 can cover the lead-out hole 201, and the boss 32 can be arranged in the lead-out hole 201. Wherein, the boss 32 arranged in the lead-out hole 201 means that at least part of the boss 32 is located in the lead-out hole 201.

[0171] The terminal body 31 is connected to the shell 2, specifically, the terminal body 31 is insulatedly connected to the shell 2. Wherein, the second insulating piece 6 related below can be arranged between the terminal body 31 and the shell 2, but is not limited thereto, for realizing insulation between the terminal body 31 and the shell 2.

[0172] In some possible designs, as shown in FIG. 12, the limiting groove 301 is arranged on the boss 32. Alternatively, in other possible designs, part of the limiting groove 301 is arranged on the boss 32, and the other part can be arranged in the composite layer 33 related below, or can be arranged on the composite layer 33 and the terminal body 31.

[0173] The boss 32 is arranged on the electrode terminal 3 and penetrates the lead-out hole 201, and at least part of the limiting groove 301 is arranged on the boss 32, so that the boss 32 can be close to the first insulating part 4 along the axial direction Z, the limiting part 42 of the first insulating part 4 and the limiting groove 301 form limiting in the axial direction Z, thereby facilitating to improve the combination strength of the first insulating part 4 and the electrode terminal 3, to improve the combination strength of the electrode terminal 3 and the shell 2, to help reduce the risk of the electrode terminal 3 being pulled out of the shell 2, and to improve the reliability of the battery monomer 10.

[0174] In some embodiments, please refer to FIGS. 5 to 12, and in combination with other drawings. At least one limiting groove 301 is a first limiting groove 301a, and the first limiting groove 301a includes a first groove segment 3011 and a second groove segment 3012 communicated with the first groove segment 3011. The limiting part 42 includes a first limiting part 421 and a second limiting part 422 connected with the first limiting part 421, and at least one of the first limiting part 421 and the second limiting part 422 is connected with the insulating body 41. The first limiting part 421 is limited in the first groove segment 3011 along the axial direction Z, and the second limiting part 422 is limited in the second groove segment 3012 along the radial direction X of the lead-out hole 201.

[0175] The first groove segment 3011 and the second groove segment 3012 are two segments of the limiting groove 301.

[0176] The first limiting part 421 and the second limiting part 422 are two parts of the limiting part 42.

[0177] It can be understood that the first groove segment 3011 has two side groove walls opposite along the axial direction Z, which are a first groove wall 3013 and a second groove wall 3014, respectively. 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 in the first groove segment 3011 along the axial direction Z.

[0178] The second groove segment 3012 has two side groove walls opposite along the radial direction X, which are a third groove wall 3015 and a fourth groove wall 3016, respectively. The second limiting part 422 is limited between the third groove wall 3015 and the fourth groove wall 3016, thereby being limited in the second groove segment 3012 along the radial direction X.

[0179] By adopting the above technical solution, the limiting part 42 can be limited in the limiting groove 301 along the axial direction Z and the radial direction X, so that the limiting strength of the limiting part 42 on the electrode terminal 3 can be improved, thereby improving the combination strength of the first insulating part 4 and the electrode terminal 3, helping to reduce the risk of the electrode terminal 3 being pulled out of the first insulating part 4, and further helping to reduce the risk of the electrode terminal 3 being pulled out of the shell 2, and improving the reliability of the battery monomer 10.

[0180] In some embodiments, please refer to FIG. 5, FIG. 9 and FIG. 12, and combine with other figures. The second slot segment 3012 can be arranged in a bent manner relative to the first slot segment 3011. Correspondingly, the second limiting portion 422 can also be arranged in a bent manner relative to the first limiting portion 421. In this way, the first limiting portion 421 can be limited in the first slot segment 3011 along the axial direction Z, and the second limiting portion 422 can be limited in the second slot segment 3012 along the radial direction X.

[0181] In some embodiments, as shown in FIG. 5 to FIG. 12, the first slot segment 3011 and the second slot segment 3012 are distributed along the radial direction X. Correspondingly, the first limiting portion 421 and the second limiting portion 422 are also distributed along the radial direction X.

[0182] In some embodiments, please refer to FIG. 5 to FIG. 12, and combine with other figures. In the axial direction Z, the second slot segment 3012 protrudes from at least one side of the first slot segment 3011.

[0183] In some embodiments, as shown in FIG. 5 to FIG. 12, the second slot segment 3012 can protrude from one side of the first slot segment 3011 along the axial direction Z. Alternatively, the second slot segment 3012 can also protrude from opposite sides of the first slot segment 3011 along the axial direction Z.

[0184] Specifically, the second slot segment 3012 is arranged in an extending manner along the axial direction Z to protrude from the first slot segment 3011, so that a stepped structure is formed between the first slot segment 3011 and the second slot segment 3012, and the stepped structure and the first slot segment 3011 are distributed along the axial direction ZZ. In some possible designs, as shown in FIG. 12, the first slot wall 3013 and the third slot wall 3015 are arranged on the stepped structure.

[0185] Correspondingly, the second limiting portion 422 protrudes from at least one side of the first limiting portion 421 along the axial direction Z, so that the first limiting portion 421 can be adaptively limited in the first slot segment 3011, and the second limiting portion 422 can be adaptively limited in the second slot segment 3012.

[0186] By protruding from at least one side of the first slot segment 3011 along the axial direction Z, the second slot segment 3012 can be used to limit the second limiting portion 422 along the radial direction X, so as to improve the bonding strength of the first insulating member 4 and the electrode terminal 3, and further improve the bonding strength of the electrode terminal 3 and the shell 2, which helps to reduce the risk of the electrode terminal 3 being pulled out of the shell 2, and improve the reliability of the battery monomer 10.

[0187] In some embodiments, please refer to FIG. 5 to FIG. 12, and combine with other figures. The limiting slot 301 can be arranged as an annular slot and arranged in an extending manner along the circumferential direction Y of the lead-out hole 201. Correspondingly, the limiting member 42 is also arranged as an annular structure and arranged in an extending manner along the circumferential direction Y of the lead-out hole 201.

[0188] In some embodiments, please refer to FIG. 13 to FIG. 19, 22 to FIG. 26, and combine with other drawings. FIG. 13 is a partial cross-sectional view of the battery monomer 10 provided by some other embodiments of the application, and FIG. 14 is an enlarged view of G in FIG. 13. FIG. 15 is a partial schematic view of the battery monomer 10 provided by some other embodiments of the application, FIG. 16 is a cross-sectional view of H-H in FIG. 15, FIG. 17 is an enlarged view of I in FIG. 16, FIG. 18 is an enlarged view of J in FIG. 17, and FIG. 19 is an enlarged cross-sectional view of the electrode terminal 3 in FIG. 18. FIG. 22 is a partial exploded view of the battery monomer 10 provided by some other embodiments of the application, FIG. 23 is an enlarged view of L in FIG. 22. FIG. 24 is a fitting schematic view of FIG. 22, in which the battery monomer 10 is parallel to the axial direction Z in FIG. 24. FIG. 25 is a cross-sectional view of M-M in FIG. 24, and FIG. 26 is an enlarged view of N in FIG. 25. The electrode terminal 3 shown in FIG. 14, FIG. 17 to FIG. 19, and FIG. 26 is a negative electrode terminal 3b. The number of the limiting grooves 301 is multiple, and the multiple limiting grooves 301 are distributed along the circumferential direction Y of the lead-out hole 201. That is, the limiting groove 301 is not provided as an annular groove.

[0189] Correspondingly, the number of the limiting members 42 is also multiple, and the multiple limiting members 42 are distributed along the circumferential direction Y and are respectively limited in the multiple limiting grooves 301 along the circumferential direction Y.

[0190] As an example, the number of the limiting members 42 is the same as the number of the limiting grooves 301, and the multiple limiting members 42 and the multiple limiting grooves 301 are provided one by one, and each limiting member 42 is limited in each limiting groove 301 along the circumferential direction Y.

[0191] In this way, by limiting the limiting member 42 in the limiting groove 301, the relative limiting of the electrode terminal 3 and the first insulating member 4 in the circumferential direction Y can be achieved, so as to limit the relative rotation of the electrode terminal 3 and the first insulating member 4 in the circumferential direction Y, improve the bonding strength of the electrode terminal 3 and the first insulating member 4, improve the bonding strength of the electrode terminal 3 and the shell 2, reduce the risk of the electrode terminal 3 being pulled out of the shell 2, reduce the problem of invalid connection relationship between the electrode terminal 3 and the electrode assembly 1, and improve the reliability of the battery monomer 10.

[0192] In some embodiments, please refer to FIG. 13 to FIG. 19, 22 to FIG. 26, and combine with other drawings. The number of the limiting grooves 301 is multiple, and the multiple limiting grooves 301 are distributed along the circumferential direction Y of the lead-out hole 201. The first limiting part 421 is limited in the first groove segment 3011 along the circumferential direction Y, and / or the second limiting part 422 is limited in the second groove segment 3012 along the circumferential direction Y.

[0193] It can be understood that, in some possible designs, as shown in FIG. 17 and FIG. 26, the first limiting part 421 is located in the first slot section 3011 in the circumferential direction Y, and the second limiting part 422 is located in the second slot section 3012 in the circumferential direction Y. Alternatively, in other possible designs, the first limiting part 421 is located in the first slot section 3011 in the circumferential direction Y, and the second limiting part 422 is not located in the second slot section 3012 in the circumferential direction Y. Alternatively, in still other possible designs, the second limiting part 422 is located in the second slot section 3012 in the circumferential direction Y, and the first limiting part 421 is not located in the first slot section 3011 in the circumferential direction Y.

[0194] In this way, the limiting part 42 is located in the limiting groove 301 in the circumferential direction Y, so that the relative limiting of the electrode terminal 3 and the first insulating part 4 in the circumferential direction Y can be achieved, and thus the relative rotation of the electrode terminal 3 and the first insulating part 4 can be limited. In this way, the bonding strength of the first insulating part 4 and the electrode terminal 3 can be improved, the bonding strength of the electrode terminal 3 and the shell 2 can be improved, the risk of the electrode terminal 3 being pulled out of the shell 2 can be reduced, and the reliability of the battery monomer 10 can be improved.

[0195] In some embodiments, please refer to FIG. 13 to FIG. 19, and in combination with other drawings. In the circumferential direction Y, the second slot section 3012 protrudes from at least one side of the first slot section 3011.

[0196] In some possible designs, the second slot section 3012 can protrude from one side of the first slot section 3011 in the circumferential direction Y. Alternatively, as shown in FIG. 17 to FIG. 19, the second slot section 3012 can also protrude from opposite sides of the first slot section 3011 in the circumferential direction Y.

[0197] Specifically, the second slot section 3012 is arranged to extend in the circumferential direction Y to protrude from the first slot section 3011, so that a stepped structure is formed between the first slot section 3011 and the second slot section 3012, and the stepped structure and the first slot section 3011 are distributed in the circumferential direction Y. In some possible designs, the third slot wall 3015 is arranged on the stepped structure.

[0198] Correspondingly, the second limiting part 422 protrudes from at least one side of the first limiting part 421 in the circumferential direction Y, so that the first limiting part 421 can be adaptively located in the first slot section 3011, and the second limiting part 422 can be adaptively located in the second slot section 3012.

[0199] By protruding from at least one side of the first slot section 3011 in the circumferential direction Y, the second slot section 3012 can be used to limit the second limiting part 422 in the radial direction X, so that the bonding strength of the first insulating part 4 and the electrode terminal 3 can be improved, the risk of the electrode terminal 3 being pulled out of the shell 2 can be reduced, and the reliability of the battery monomer 10 can be improved.

[0200] In some embodiments, please refer to FIGS. 5-19, and combine with other drawings. The electrode terminal 3 comprises a terminal body 31 and a boss 32. The terminal body 31 is connected to the shell 2 and covers the lead-out hole 201. The boss 32 is arranged at one end of the terminal body 31 close to the electrode assembly 1 and penetrates into the lead-out hole 201. The boss 32 is connected to the electrode assembly 1. A first groove segment 3011 is arranged on the outer peripheral wall of the boss 32, and at least part of a second groove segment 3012 is arranged on the boss 32.

[0201] It can be understood that the first groove segment 3011 penetrates through the outer peripheral wall of the boss 32 along the radial direction X to be exposed on the outer peripheral wall of the boss 32. Among them, the first groove segment 3011 and the second groove segment 3012 can be distributed approximately along the radial direction X.

[0202] Based on this, the first limiting part 421 can be connected to the insulating body 41, and the second limiting part 422 is 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 direction X.

[0203] In some possible designs, as shown in FIGS. 5-19, the second groove segment 3012 is arranged on the boss 32. Alternatively, in other possible designs, part of the first groove segment 3011 is arranged on the boss 32, and the other part can be arranged on the composite layer 33 referred to below, or on the composite layer 33 and the terminal body 31.

[0204] By adopting the above technical solutions, at least part of the first insulating part 4 can be arranged on the outer peripheral side of the boss 32, so that the first insulating part 4 can not only realize the insulation between the shell 2 and the electrode assembly 1, but also realize the insulation between the boss 32 and the shell 2, which helps to improve the reliability of the battery monomer 10.

[0205] In some embodiments, please refer to FIGS. 9 and 12, and combine with other drawings. The second limiting part 422 is also limited in the second groove segment 3012 along the axial direction Z.

[0206] Specifically, the first groove segment 3011 and the second groove segment 3012 are distributed along the radial direction X. The second groove segment 3012 has two side groove walls opposite along the axial direction Z, which are the fifth groove wall 3017 and the sixth groove wall 3018, respectively. The second limiting part 422 is limited between the fifth groove wall 3017 and the sixth groove wall 3018, so as to be limited in the second groove segment 3012 along the axial direction Z.

[0207] In some possible designs, as shown in FIGS. 9 and 12, and combine with other 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 sequentially connected, and 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.

[0208] It can be understood that the limiting groove 301 penetrates the outer peripheral wall of the boss 32 in the radial direction X, but does not penetrate the electrode terminal 3 in the axial direction Z.

[0209] In this way, the second limiting portion 422 is respectively limited in the second groove segment 3012 in the radial direction X and the axial direction Z. In this way, the limiting strength of the limiting member 42 and the limiting groove 301 in the axial direction Z can be improved, thereby improving the combination strength of the first insulating member 4 and the electrode terminal 3, which helps to reduce the risk of the electrode terminal 3 being pulled out of the shell 2, and improves the reliability of the battery monomer 10.

[0210] In some embodiments, please refer to FIG. 9 and FIG. 12, and combine with other drawings. The first size L1 of the boss 32 is equal to [1 / 3, 2 / 3] * the second size L2 of the boss 32. Wherein, the first size L1 is the distance between the groove wall of the second groove segment 3012 close to the outer peripheral wall of the boss 32 and the outer peripheral wall of the boss 32 in the radial direction X. The second size L2 is the distance 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 in the radial direction X.

[0211] In the radial direction X, the groove wall of the second groove segment 3012 close to the outer peripheral wall of the boss 32 is the 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 fourth groove wall 3016.

[0212] It can be understood that the distance between the third groove wall 3015 and the outer peripheral wall of the boss 32 in the radial direction X is the first size L1, and the distance between the fourth groove wall 3016 and the outer peripheral wall of the boss 32 in the radial direction X is the second size L2.

[0213] Wherein, the first size L1 < the second size L2, and the first size L1 = [1 / 3, 2 / 3] * the second size L2. That is, the first size L1 ≥ 1 / 3 * the second size L2, and the first size L1 ≤ 2 / 3 * the second size L2.

[0214] In this way, the step structure formed by the first groove segment 3011 and the second groove segment 3012 has a relatively appropriate size in the radial direction X. In this way, on the one hand, the limiting groove 301 does not excessively occupy the volume of the boss 32, thereby being able to guarantee the structural strength and the flow capacity of the boss 32 to a certain extent. On the other hand, the step structure can realize relatively firm limiting of the second limiting portion 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, so as to improve the combination strength of the first insulating member 4 and the electrode terminal 3, which helps to reduce the risk of the electrode terminal 3 being pulled out of the shell 2, and improves the reliability of the battery monomer 10.

[0215] In some embodiments, please refer to FIG. 20 and FIG. 21, and combine with other figures. FIG. 20 is a sectional view of the electrode terminal 3 of the battery cell 10 according to some embodiments of the present application, and FIG. 21 is an enlarged view of K in FIG. 20. In FIG. 20 and FIG. 21, the electrode terminal 3 is a negative electrode terminal 3b. The second slot segment 3012 is arranged at an end of the electrode terminal 3 close to the electrode assembly 1 along the axial direction Z.

[0216] For the convenience of description, the end of the electrode terminal 3 close to the electrode assembly 1 along the axial direction Z is defined as the first wall 302.

[0217] When the electrode terminal 3 comprises the terminal body 31 and the boss 32, the first wall 302 is arranged at an end of the boss 32 away from the terminal body 31 along the axial direction Z, that is, at an end of the boss 32 close to the electrode assembly 1 along the axial direction Z.

[0218] It can be understood that the second slot segment 3012 penetrates the first wall 302 of the electrode terminal 3 along the axial direction Z to be exposed on the first wall 302.

[0219] By using the above technical solution, the limiting member 42 and the limiting slot 301 are inserted and matched.

[0220] In some embodiments, please refer to FIG. 20 and FIG. 21, and combine with other figures. The first slot segment 3011 and the second slot segment 3012 are distributed along the axial direction Z, and the first limiting part 421 is further limited in the first slot segment 3011 along the radial direction X.

[0221] Specifically, the first slot segment 3011 has two side slot walls opposite along the radial direction X, which are the seventh slot wall 3019 and the eighth slot wall 3020. The first limiting part 421 is limited between the seventh slot wall 3019 and the eighth slot wall 3020, so as to be limited in the first slot segment 3011 along the radial direction X.

[0222] In some possible designs, as shown in FIG. 20 and FIG. 21, and combine with other figures. The third slot wall 3015, the first slot wall 3013, the seventh slot wall 3019, the second slot wall 3014, the eighth slot wall 3020 and the fourth slot wall 3016 are sequentially connected, the third slot wall 3015 and the fourth slot wall 3016 are arranged at intervals, and are respectively connected to the first wall 302.

[0223] It can be understood that the limiting slot 301 penetrates an end of the boss 32 away from the terminal body 31 along the axial direction Z, but does not penetrate the peripheral wall of the boss 32 along the radial direction X.

[0224] In this way, the first limiting part 421 is respectively limited in the first groove segment 3011 in the radial direction X and the axial direction Z. In this way, the limiting strength of the limiting part 42 and the limiting groove 301 in the axial direction Z can be improved, so as to improve the combination strength of the first insulating part 4 and the electrode terminal 3, which helps to reduce the risk of the electrode terminal 3 being pulled out of the shell 2, and improve the reliability of the battery monomer 10.

[0225] In some embodiments, please refer to FIG. 20 and FIG. 21, and combine with other drawings. The third size L3 of the electrode terminal 3 is equal to [1 / 3, 2 / 3] * the fourth size L4 of the electrode terminal 3. Wherein, the third size L3 is the distance between the first groove segment 3011 and the first wall 302 in the axial direction Z. The fourth size L4 is the distance between the first groove segment 3011 and the second wall 3014 in the axial direction Z.

[0226] Wherein, the end of the electrode terminal 3 close to the electrode assembly 1 is the first wall 302. The groove wall of the first groove segment 3011 close to the electrode assembly 1 in the axial direction Z is the first groove wall 3013. The groove wall of the first groove segment 3011 away from the electrode assembly 1 in the axial direction Z is the second groove wall 3014.

[0227] It can be understood that the distance between the first groove wall 3013 and the first wall 302 is the third size L3, and the distance between the second groove wall 3014 and the first wall 302 is the fourth size L4.

[0228] Wherein, the third size L3 < the fourth size L4, and the third size L3 = [1 / 3 ~ 2 / 3] * the fourth size L4. That is, the third size L3 ≥ 1 / 3 * the fourth size L4, and the third size L3 ≤ 2 / 3 * the fourth size L4.

[0229] In this way, the step structure formed by the first groove segment 3011 and the second groove segment 3012 has a relatively appropriate size in the axial direction Z. In this way, on the one hand, the limiting groove 301 does not occupy too much volume of the electrode terminal 3, so as to ensure the structural strength and the overcurrent capacity of the electrode terminal 3 to a certain extent. On the other hand, the step structure can firmly limit the first limiting part 421 in the axial direction Z, so as to improve the limiting strength of the limiting part 42 and the limiting groove 301 in the radial direction X and the axial direction Z, so as to improve the combination strength of the first insulating part 4 and the electrode terminal 3, which helps to reduce the risk of the electrode terminal 3 being pulled out of the shell 2, and improve the reliability of the battery monomer 10.

[0230] It is to be understood that, in the case where the limiting groove 301 penetrates the outer peripheral wall of the boss 32 in the radial direction X without penetrating the first wall 302 in the axial direction Z, or in the case where the limiting groove 301 penetrates the first wall 302 in the axial direction Z without penetrating the outer peripheral wall of the boss 32 in the radial direction X, in some possible designs, the limiting groove 301 can be arranged to extend in the circumferential direction Y to be substantially annular and surround the outer peripheral wall of the boss 32. Based on this, the limiting member 42 can be arranged to extend in the circumferential direction Y to be substantially annular, or can be arranged to be a plurality of limiting members 42 arranged to be spaced apart in the circumferential direction Y. In other possible designs, the limiting groove 301 can also be arranged to be a plurality of limiting grooves 301 arranged to be spaced apart in the circumferential direction Y. Based on this, the limiting member 42 is arranged to be a plurality of limiting members 42 arranged to be spaced apart in the circumferential direction Y, and the plurality of limiting members 42 can be arranged to be correspondingly limited in the plurality of limiting grooves 301.

[0231] In other embodiments, the limiting groove 301 can penetrate the outer peripheral wall of the boss 32 in the radial direction X and penetrate the first wall 302 in the axial direction Z. Based on this, the limiting groove 301 is arranged to be a plurality of limiting grooves 301 arranged to be spaced apart in the circumferential direction Y to ensure the structural integrity of the electrode terminal 3. Correspondingly, the limiting member 42 is arranged to be a plurality of limiting members 42 arranged to be spaced apart in the circumferential direction Y, and the plurality of limiting members 42 are arranged to be correspondingly limited in the plurality of limiting grooves 301.

[0232] In some embodiments, reference can be made to FIGS. 22 to 29 in combination with other drawings. FIG. 27 is an enlarged view of position O in FIG. 26, FIG. 28 is an enlarged sectional view of the electrode terminal 3 in FIG. 27, and FIG. 29 is a structural view of the electrode terminal 3 of the battery cell 10 provided in FIG. 22. In FIGS. 27 to 29, the electrode terminal 3 is a negative electrode terminal 3b. The at least one limiting groove 301 is a second limiting groove 301b arranged 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 is arranged to gradually decrease towards the outer peripheral wall of the boss 32.

[0233] It can be understood that the second limiting groove 301b can penetrate the outer peripheral wall of the boss 32 in the radial direction X. In the direction of the second limiting groove 301b penetrating the outer peripheral wall of the boss 32 in the radial direction X, the cross-section of the second limiting groove 301b perpendicular to the radial direction X is arranged to taper.

[0234] Correspondingly, in the direction of the second limiting groove 301b penetrating the outer peripheral wall of the boss 32 in the radial direction X, the cross-section of the limiting member 42 perpendicular to the radial direction X is arranged to taper.

[0235] 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.

[0236] In some embodiments, please refer to Figures 26 and 29 together, and in conjunction with other figures. There are multiple second limiting grooves 301b, and the multiple second limiting grooves 301b are distributed at intervals along the circumferential Y direction of the lead-out hole 201.

[0237] 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.

[0238] In some embodiments, please refer to Figures 27 and 28 together, and in conjunction with other figures. The circumferential dimension of the second limiting groove 301b is gradually reduced along the radial X direction toward the outer peripheral wall of the boss 32.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] 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.

[0243] 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.

[0244] Based on this, in some possible designs, the second limiting groove 301b can be annular to surround the outer circumferential wall of the boss 32. Correspondingly, the second limiting groove 301b can also be provided as a plurality of second limiting grooves 301b, and the plurality of second limiting members 42 are distributed along the circumferential direction Y. In other possible designs, the number of the second limiting grooves 301b can be a plurality of second limiting grooves 301b, and the plurality of second limiting grooves 301b are distributed along the circumferential direction YY. Correspondingly, the number of the limiting members 42 can be a plurality of limiting members 42, and the plurality of limiting members 42 are distributed along the circumferential direction Y and correspondingly limited in the plurality of second limiting grooves 301b.

[0245] By adopting the above technical solution, the cross-sectional area of the second limiting groove 301b perpendicular to the radial direction X can be gradually reduced in the direction of the outer circumferential wall of the boss 32, so that the groove wall of the second limiting groove 301b can limit the limiting member 42 in the radial direction X. In this way, it is helpful to improve the bonding strength between the electrode terminal 3 and the first insulating member 4, to improve the bonding strength between the first insulating member 4 and the shell 2, to reduce the risk of the electrode terminal 3 being pulled out of the shell 2, and to improve the reliability of the battery monomer 10.

[0246] In some embodiments, please refer to FIGS. 26-29, and in combination with other drawings. The number of the second limiting groove 301b is a plurality of second limiting grooves 301b, and the plurality of second limiting grooves 301b are distributed along the circumferential direction Y of the lead-out hole 201, and the groove walls on the opposite sides of the second limiting groove 301b in the circumferential direction Y are tapered in the radial direction X towards the outer circumferential wall of the boss 32.

[0247] The groove walls on the opposite sides of the second limiting groove 301b in the circumferential direction Y are respectively a ninth groove wall 3021 and a tenth groove wall 3022, and the limiting member 42 is limited between the ninth groove wall 3021 and the tenth groove wall 3022 to be limited in the second limiting groove 301b in the circumferential direction Y.

[0248] In the direction of the outer circumferential wall of the boss 32 in the radial direction X, the ninth groove wall 3021 and the tenth groove wall 3022 are tapered, so that the second limiting groove 301b is closed at the outer circumferential wall of the electrode terminal 3, and both the ninth groove wall 3021 and the tenth groove wall 3022 can limit the limiting member 42 in the radial direction X, that is, the groove walls on the opposite sides of the second limiting groove 301b in the circumferential direction Y can limit the limiting member 42 in the radial direction XX.

[0249] In some embodiments, the groove walls on the opposite sides of the second limiting groove 301b in the axial direction Z are tapered in the radial direction X towards the outer circumferential wall of the boss 32.

[0250] In this way, the second limiting groove 301b can be closed at the outer peripheral wall of the boss 32 in the direction of the radial direction X, so that the two groove walls on the opposite sides of the second limiting groove 301b in the axial direction Z can limit the limiting piece 42 in the radial direction X.

[0251] By adopting the above technical solution, the limiting strength of the second limiting groove 301b to the limiting piece 42 in the radial direction X can be improved, so as to improve the combination strength between the electrode terminal 3 and the first insulating piece 4, and reduce the risk of the electrode terminal 3 being pulled out of the shell 2.

[0252] In some embodiments, the fifth size of the second limiting groove 301b = [0.6, 0.9] * the sixth size of the second limiting groove 301b. The fifth size is the axial size of the second limiting groove 301b at one end of the outer peripheral wall of the boss 32, and the sixth size is the axial size of the second limiting groove 301b away from one end of the outer peripheral wall of the boss 32 in the radial direction X.

[0253] That is, the fifth size is greater than or equal to 0.6 times the sixth size, and the fifth size is less than or equal to 0.9 times the sixth size.

[0254] In this way, the limiting piece 42 can be effectively limited in the second limiting groove 301b in the radial direction X. Moreover, the closing arrangement of the second limiting groove 301b at the outer peripheral wall of the boss 32 is not too small, so as to facilitate the limiting piece 42 to enter the second limiting groove 301b.

[0255] In some embodiments, please refer to FIG. 27 and FIG. 28, and combine with other drawings. The seventh size L5 of the second limiting groove 301b = [0.6, 0.9] * the eighth size L6 of the second limiting groove 301b. The seventh size L5 is the circumferential size of the second limiting groove 301b at one end of the outer peripheral wall of the boss 32, and the eighth size L6 is the circumferential size of the second limiting groove 301b away from one end of the outer peripheral wall of the boss 32 in the radial direction X.

[0256] It can be understood that the seventh size L5 is greater than or equal to 0.6 times the eighth size L6, and the seventh size L5 is less than or equal to 0.9 times the eighth size L6.

[0257] In this way, the limiting piece 42 can be effectively limited in the second limiting groove 301b in the radial direction X. Moreover, the closing arrangement of the second limiting groove 301b at the outer peripheral wall of the boss 32 is not too small, so as to facilitate the limiting piece 42 to enter the second limiting groove 301b.

[0258] For the convenience of description, it is assumed here that the axial size of the boss 32 is the ninth size L7.

[0259] In some embodiments, please refer to FIG. 30 and FIG. 31, and combine with other drawings. FIG. 30 is a sectional view of the electrode terminal 3 of the battery cell 10 provided in some embodiments of the present application, and FIG. 31 is an enlarged view of P in FIG. 30. In FIG. 30 and FIG. 31, the electrode terminal 3 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 arranged on the boss 32. The axial dimension of the limiting groove 301 of the positive electrode terminal 3a = [1 / 3, 2 / 3] * the axial dimension of the boss 32.

[0260] For the convenience of description, it is assumed that the axial dimension of the limiting groove 301 of the positive electrode terminal 3a is the tenth dimension L8.

[0261] In some embodiments, please refer to FIG. 30 and FIG. 31, and combine with other drawings. FIG. 30 is a sectional view of the electrode terminal 3 of the battery cell 10 provided in some embodiments of the present application, and FIG. 31 is an enlarged view of P in FIG. 30. In FIG. 30 and FIG. 31, the electrode terminal 3 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 arranged on the boss 32. The axial dimension of the limiting groove 301 of the positive electrode terminal 3a = [1 / 3, 2 / 3] * the axial dimension of the boss 32.

[0262] When the first groove section 3011 and the second groove section 3012 of the limiting groove 301 are distributed along the axial direction Z, the tenth dimension L8 = the sum of the axial dimension of the first groove section 3011 and the axial dimension of the second groove section 3012.

[0263] It can be understood that the tenth dimension L8 ≥ 1 / 3 * the axial dimension of the boss 32, and the tenth dimension L8 ≤ 2 / 3 * the axial dimension of the boss 32.

[0264] In this way, the limiting groove 301 occupies a relatively appropriate dimension proportion of the boss 32 of the positive electrode terminal 3a in the axial direction Z, so that the limiting groove 301 can effectively limit the limiting member 42 and at the same time ensure the structural strength and the overcurrent capacity of the boss 32 to a certain extent.

[0265] In some embodiments, please refer to FIG. 12 and FIG. 29, and combine with other drawings. The electrode terminal 3 includes the negative electrode terminal 3b, and the negative electrode terminal 3b further includes the composite layer 33. The material of the composite layer 33 is different from that of the terminal body 31 and is the same as that of the boss 32. The composite layer 33 is arranged between the terminal body 31 and the boss 32. The radial dimension of the composite layer 33 is greater than that of the boss 32, and the composite layer 33 covers the lead-out hole 201.

[0266] It can be understood that the terminal body 31, the composite layer 33, and the boss 32 are sequentially distributed along the axial direction Z.

[0267] The material of the composite layer 33 and the boss 32 is the same, and the material of the composite layer 33 and the terminal body 31 is different, so that the negative electrode terminal 3b is a composite pole that is composed of different materials. As an example, the material of the terminal body 31 is aluminum, and the terminal body 31 constitutes an outer pole of the negative electrode terminal 3b; the material of the composite layer 33 and the boss 32 is the same and is copper, and the composite layer 33 and the boss 32 constitute an inner pole of the electrode terminal 3.

[0268] By the radial dimension of the composite layer 33 being greater than the radial dimension of the boss 32, 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 31 being pulled out of the shell 2 can be improved. On the other hand, the composite layer 33 covers the lead-out hole 201, so that, on the basis of the sealing ring 8 being used to seal the connection between the negative electrode terminal 3b and the shell 2, the sealing ring 8 can be sealed between the composite layer 33 and the shell 2 in the axial direction Z, so that the problem of the electrolyte in the shell 2 damaging the composite interface between the composite layer 33 and the terminal body 31 can be effectively improved, and the structural strength of the electrode terminal 3 can be ensured and maintained to a certain extent.

[0269] In addition, the boss 32 is provided, so that the sealing ring 8 can be sleeved on the outer periphery of the boss 32 and sealed between the composite layer 33 and the shell 2 in the axial direction Z. In this way, the distance between the position for welding of the electrode terminal 3 and the sealing ring 8 can be lengthened, and the problem that heat generated during welding is quickly transferred to the sealing ring 8 to damage the sealing ring 8 can be improved when the boss 32 is welded.

[0270] It should be noted here 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.

[0271] For ease of description, it is assumed here that the axial dimension of the composite layer 33 is an eleventh dimension L9.

[0272] In some embodiments, reference should be made to FIGS. 12, 20 and 21, and in combination with other drawings. The axial dimension of the limiting groove 301 of the negative electrode terminal 3b is equal to [1 / 3, 2 / 3] * the sum of the axial dimensions of the boss 32 and the composite layer 33.

[0273] For ease of description, it is assumed here that the axial dimension of the limiting groove 301 of the negative electrode terminal 3b is a twelfth dimension L10.

[0274] When the first slot section 3011 and the second slot section 3012 of the limiting slot 301 are distributed along the radial direction X, the twelfth size L10 = max (axial size of the first slot section 3011, axial size of the second slot section 3012). For example, as shown in FIG. 12, the second slot section 3012 protrudes from the first slot section 3011 along the axial direction Z, so that max (axial size of the first slot section 3011, axial size of the second slot section 3012) = axial size of the second slot section 3012, that is, the twelfth size L10 is the axial size of the second slot section 3012.

[0275] When the first slot section 3011 and the second slot section 3012 of the limiting slot 301 are distributed along the axial direction Z, as shown in FIG. 21, the twelfth size L10 = sum of the axial size of the first slot section 3011 and the axial size of the second slot section 3012. In FIG. 21, the twelfth size L10 is the fourth size L4.

[0276] It can be understood that the twelfth size L10 ≥ 1 / 3 * sum of the ninth size L7 and the eleventh size L9, and the twelfth size L10 ≤ 2 / 3 * sum of the ninth size L7 and the eleventh size L9.

[0277] In this way, the limiting slot 301 occupies a relatively appropriate size ratio of the boss 32 and the composite layer 33 of the negative electrode terminal 3b in the axial direction Z, so that the limiting slot 301 can effectively limit the limiting piece 42, and to a certain extent, the structural strength and flow capacity of the boss 32 and the composite layer 33 can be guaranteed.

[0278] In some embodiments, please refer to FIG. 12, and combine with other drawings. The electrode terminal 3 is provided with a welding portion 321 close to the electrode assembly 1. In FIG. 12, the welding portion 321 is divided by a dashed line.

[0279] It can be understood that the end of the electrode terminal 3 close to the electrode assembly 1 is the first wall 302, and the welding portion 321 is a part of the first wall 302.

[0280] The welding portion 321 is used for welding the electrode assembly 1; or the welding portion 321 is used for welding the adapter structure 7.

[0281] In some embodiments, please refer to FIG. 12, and combine with other drawings. In the radial direction X of the lead-out hole 201, the slot wall of the limiting slot 301 protrudes or is flush with the welding portion 321 away from the outer peripheral wall of the electrode terminal 3.

[0282] Specifically, in the radial direction X, the slot wall of the limiting slot 301 protrudes or is flush with the welding portion 321 away from the outer peripheral wall of the boss 32.

[0283] When the limiting groove 301 comprises the first groove segment 3011 and the 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.

[0284] Alternatively, 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 groove wall of the limiting groove 301 close to the welding portion 321 and the welding portion 321 is ≥1mm.

[0285] Specifically, in the radial direction X, the welding portion 321 protrudes from the groove wall of the limiting groove 301 away from the outer peripheral wall of the boss 32 towards the outer peripheral wall of the boss 32.

[0286] When the limiting groove 301 comprises the first groove segment 3011 and the 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 boss 32 is the fourth groove wall 3016 of the second groove segment 3012.

[0287] When the second groove segment 3012 exceeds the first groove segment 3011 along the axial direction Z towards the electrode terminal 3, in the axial direction Z, the groove wall of the limiting groove 301 close to the welding portion 321 is the fifth groove wall 3017 of the second groove segment 3012; when the second groove segment 3012 exceeds the first groove segment 3011 along the axial direction Z away from the electrode terminal 3, in the axial direction Z, the groove wall of the limiting groove 301 close to the welding portion 321 is the sixth groove wall 3018 of the second groove segment 3012.

[0288] In the axial direction Z, the distance between the groove wall of the limiting groove 301 close to the welding portion 321 and the welding portion 321 is a first distance, the first distance ≥1mm, and specifically can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, etc.

[0289] In this way, when the adapter structure 7 or the electrode assembly 1 is welded to the welding portion 321, the problem of the limiting groove 301 being damaged during welding can be improved, the welding work of the welding portion 321 can be ensured to a certain extent, and the limiting groove 301 can effectively limit the limiting piece 42.

[0290] 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 one end of the limiting groove 301 close to the welding portion 321 and the welding portion 321 ranges from 1.5mm to 3.5mm.

[0291] That is, the first distance ranges from 1.5 mm to 3.5 mm, and can be 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.7 mm, 3 mm, 3.3 mm, 3.5 mm, etc.

[0292] In this way, the limiting groove 301 has a proper distance between the one end close to the welding portion 321 and the welding portion 321 in the axial direction Z. In this way, on the one hand, the problem that the limiting groove 301 is damaged during welding can be improved, and on the other hand, the limiting groove 301 can occupy a proper 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.

[0293] In some embodiments, referring to FIGS. 8 and 9, and in combination with other drawings. The first insulating member 4 further comprises a connecting member 43, which surrounds the outer periphery of the boss 32 and is connected between the connecting member 43 and the insulating body 41.

[0294] The connecting member 43 is part of the structure of the first insulating member 4 and has an insulating property.

[0295] By surrounding the outer periphery of the boss 32 and being connected between the connecting member 43 and the insulating body 41, the connecting member 43 is arranged between the inner peripheral wall of the lead-out hole 201 and the outer peripheral wall of the boss 32. In this way, the connecting member 43 not only realizes the connection between the limiting member 42 and the insulating body 41, but also realizes the insulating effect between the shell 2 and the boss 32, thereby helping to improve the reliability of the battery monomer 10.

[0296] In some embodiments, the first insulating member 4 is injection molded to be connected to the electrode terminal 3.

[0297] It can be understood that the first insulating member 4 is connected to the electrode terminal 3 by injection molding.

[0298] In this way, the limiting member 42 of the first insulating member 4 can fully enter the limiting groove 301, thereby forming a very firm and stable limiting relationship with the limiting groove 301. In this way, the bonding strength between the electrode terminal 3 and the first insulating member 4 can be improved, so as to reduce the risk of the electrode terminal 3 being pulled out of the shell 2.

[0299] In some embodiments, referring to FIGS. 8 to 12, and in combination with other drawings. The battery monomer 10 further comprises 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 and the electrode terminal 3. The fixing member 5 is connected to the shell 2.

[0300] The second insulating member 6 refers to a component with insulating properties, and the material of the second insulating member 6 can be, but is not limited to, plastic.

[0301] The fixing member 5 refers to a component for fixing the electrode terminal 3 to the shell 2, and can be, but is not limited to, metal.

[0302] 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 between the electrode terminal 3 and the fixing member 5, so that the second insulating member 6 can not only realize the connection between the fixing member 5 and the electrode terminal 3, but also realize the insulation between the fixing member 5 and the electrode terminal 3. Therefore, through the setting of the second insulating member 6 and the fixing member 5, the insulating connection between the electrode terminal 3 and the shell 2 is realized.

[0303] 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.

[0304] Please refer to FIG. 2, and combine with other drawings. The battery 100 provided by the embodiment of the present application comprises a battery monomer 10. Wherein, the battery monomer 10 in the embodiment is the same as the battery monomer 10 in each of the above embodiments, and the specific description is referred to the related description of the battery monomer 10 in each of the above embodiments, which is not described here.

[0305] The battery 100 provided by the embodiment of the present application can reduce the risk of the electrode terminal 3 being pulled out of the shell 2, improve the reliability of the battery monomer 10, and thus improve the reliability of the battery 100, by adopting the battery monomer 10 related by each of the above embodiments.

[0306] Please refer to FIG. 1, the power consumption device provided by the embodiment of the present application comprises a battery 100. Wherein, the battery 100 in the embodiment is the same as the battery 100 in each of the above embodiments, and the specific description is referred to the related description of the battery 100 in each of the above embodiments, which is not described here.

[0307] The power consumption device provided by the embodiment of the present application can improve the stability and reliability of the battery 100, and thus help to improve the reliability of the power consumption device, by adopting the battery 100 related by each of the above embodiments.

[0308] As one of the embodiments of the present application, as shown in FIGS. 3-12, the battery cell 10 includes the shell 2, the electrode assembly 1, the electrode terminal 3, the first insulating member 4, the second insulating member 6, and the fixing member 5. The electrode assembly 1 is arranged in the shell 2, and the shell 2 is provided with the lead-out hole 201. The electrode terminal 3 includes the terminal body 31 and the boss 32 arranged at one end of the terminal body 31 close to the electrode assembly 1 along the axial direction Z. 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 shell 2. The second insulating member 6 is connected between the terminal body 31 and the fixing member 5 to separate the terminal body 31 and the fixing member 5. The boss 32 is arranged in the lead-out hole 201. The boss 32 is provided with the limiting groove 301 which is substantially annular. The limiting groove 301 includes the first groove section 3011 and the second groove section 3012 which is communicated with the first groove section 3011, and the first groove section 3011 and the second groove section 3012 are distributed along the radial direction X substantially. The first groove section 3011 is arranged at the outer peripheral wall of the boss 32. The second insulating member 6 includes the insulating body 41, the connecting member 43, the first limiting part 421, and the second limiting part 422, the connecting member 43 is connected to the insulating body 41, the first limiting part 421 is connected to the connecting member 43, and the second limiting part 422 is connected to the first limiting part 421. The insulating body 41 is arranged between the shell 2 and the electrode assembly 1, the connecting member 43 is sleeved on the outer periphery of the boss 32, the first limiting part 421 is limited in the first groove section 3011 along the axial direction Z, and the second limiting part 422 is limited in the second groove section 3012 along the axial direction Z and the radial direction X.

[0309] The above merely provides optional embodiments of the present application, but should not be used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included within the scope of claims of the present application.

Claims

1. A battery cell, wherein, 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 of claim 1 or 2, wherein, 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 of claim 3 or 4, wherein, 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 of claim 7 or 8, wherein, ​ ​ 10. The battery cell of any one of claims 3-9, wherein, ​ 11. The battery cell of claim 10, wherein, ​ 12. The battery cell of claim 10 or 11, wherein, ​ 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 of claim 13 or 14, wherein, 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 one 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, wherein, 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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