Battery cell, battery, and electrical apparatus

Abstract

The present application is applicable to the technical field of batteries (100), and provides a battery cell (10), a battery (100), and an electrical apparatus. The electrical apparatus comprises the battery (100), the battery (100) comprises the battery cell (10), and the battery cell (10) comprises a casing (2), an electrode terminal (3), and an insulating member (4). The casing (2) comprises a first wall (221); the electrode terminal (3) is provided on the first wall (221), and is provided with a limiting recess (301); the insulating member (4) comprises an insulating body (41) and a limiting member (42) connected to the insulating body (41); at least part of the insulating body (41) is disposed between the electrode terminal (3) and the first wall (221), and the insulating body (41) at least partly surrounds the periphery of the electrode terminal (3); and the limiting member (42) cooperates with the limiting recess (301) to form limiting in the axial direction (Z) of the electrode terminal (3). The limiting member (42) of the insulating member (4) has a limiting fit with the limiting recess (301) of the electrode terminal (3) in the axial direction (Z) of the electrode terminal (3), so that the insulating member (4) and the electrode terminal (3) are limited in the axial direction (Z). In this way, the bonding strength between the insulating member (4) and the electrode terminal (3) can be increased, and the risk of the electrode terminal (3) falling out of the insulating member (4) is reduced, that is, the risk of the electrode terminal (3) falling out of the casing (2) is reduced, and the reliability of the battery cell (10) is improved.

Description

Battery cell, battery and electric device

[0001] Cross-reference to related applications

[0002] This application claims priority to the Chinese patent application No. 202411236944.9, filed on September 4, 2024, and entitled "Battery cell, battery and electric device", the entire 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 housing and an electrode terminal, the electrode assembly is arranged in the housing. The electrode terminal is arranged on the housing 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 housing 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 housing.

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

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

[0009] a housing comprising a first wall;

[0010] an electrode terminal arranged on the first wall and provided with a limiting groove;

[0011] an insulating piece comprising an insulating body and a limiting member connected to the insulating body, at least part of the insulating body is arranged between the electrode terminal and the first wall, and at least part of the insulating body is arranged around the outer periphery of the electrode terminal; the limiting member cooperates with the limiting groove to form a limiting in the axial direction of the electrode terminal.

[0012] The battery cell provided by the embodiments of the present application realizes limiting in the axial direction of the electrode terminal through the limiting member of the insulating piece and the limiting groove of the electrode terminal. In this way, the combination strength between the insulating piece and the electrode terminal can be improved, and the risk of the electrode terminal being separated from the insulating piece, i.e. the risk of the electrode terminal being separated from the housing, can be reduced, thereby improving the reliability of the battery cell.

[0013] 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 communicated with the first groove segment; the limiting member comprises a first limiting part and a second limiting part connected with the first limiting part, at least one of the first limiting part and the second limiting part is connected with the insulating body; the first limiting part is axially limited in the first groove segment, and the second limiting part is radially limited in the second groove segment.

[0014] By adopting the above technical solution, the limiting member can be axially and radially limited in the limiting groove, so that the limiting strength of the limiting member on the electrode terminal can be improved, thereby improving the combination strength of the insulating member and the electrode terminal, and helping to reduce the risk of the electrode terminal being pulled out of the shell, thereby improving the reliability of the battery monomer.

[0015] In some embodiments, in the axial direction, the second groove segment protrudes from at least one side of the first groove segment.

[0016] By making the second groove segment protrude from at least one side of the first groove segment in the axial direction, the second groove segment can be used to limit the second limiting part in the radial direction, thereby improving the combination strength of the insulating member and the electrode terminal, and helping to reduce the risk of the electrode terminal being pulled out of the shell, thereby improving the reliability of the battery monomer.

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

[0018] In this way, the first limiting part can be adaptively limited in the first groove segment, and the second limiting part can be adaptively limited in the second groove segment. Therefore, the combination strength of the insulating member and the electrode terminal can be improved, and the risk of the electrode terminal being pulled out of the shell can be reduced, thereby improving the reliability of the battery monomer.

[0019] In some embodiments, the number of limiting grooves is a plurality, and the plurality of limiting grooves are distributed in the circumferential direction of the electrode terminal.

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

[0021] In this way, the limiting member is circumferentially limited in the limiting groove, so that the relative limitation of the electrode terminal and the insulating member in the circumferential direction can be achieved. That is, the relative rotation of the electrode terminal and the insulating member can be limited. In this way, the combination strength of the insulating member and the electrode terminal can be improved, and the risk of the electrode terminal being pulled out of the shell can be reduced, thereby improving the reliability of the battery monomer.

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

[0023] By protruding the second groove section from at least one side of the first groove section in the circumferential direction, the second groove section can be used to limit the second limiting portion in the radial direction, thereby improving the bonding strength of the insulating member and the electrode terminal, helping to reduce the risk of the electrode terminal being pulled out of the shell, and improving the reliability of the battery monomer.

[0024] In some embodiments, in the circumferential direction, the second limiting portion protrudes from at least one side of the first limiting portion.

[0025] In this way, the first limiting portion can be adaptively limited in the first groove section, and the second limiting portion can be adaptively limited in the second groove section. Thus, the bonding strength of the insulating member and the electrode terminal can be improved, helping to reduce the risk of the electrode terminal being pulled out of the shell, and improving the reliability of the battery monomer.

[0026] In some embodiments, the first groove section is provided on the outer peripheral wall of the electrode terminal; and / or, the second groove section penetrates the first outer wall of the electrode terminal in the axial direction.

[0027] By adopting the above technical solution, the arrangement of the limiting groove on the electrode terminal is very flexible.

[0028] In some embodiments, the first groove section is provided on the outer peripheral wall of the electrode terminal, a stepped structure is formed between the first groove section and the second groove section, and the outer peripheral wall of the electrode terminal is provided on the stepped structure.

[0029] The single-side dimension of the stepped structure in the radial direction is a first dimension, the single-side dimension of the limiting groove in the radial direction is a second dimension, and the first dimension = [1 / 3-2 / 3]*the second dimension.

[0030] In this way, the stepped structure formed by the first groove section and the second groove section has a relatively appropriate size in the radial direction. In this way, on the one hand, the limiting groove does not excessively occupy the volume of the electrode terminal, thereby being able to guarantee the overcurrent capacity of the electrode terminal to a certain extent. On the other hand, the stepped structure can achieve a relatively firm limiting effect on the second limiting portion in the radial direction, thereby being able to improve the limiting strength of the limiting member and the limiting groove in the radial direction, to improve the bonding strength of the insulating member and the electrode terminal, helping to reduce the risk of the electrode terminal being pulled out of the shell, and improving the reliability of the battery monomer.

[0031] In some embodiments, the second groove section penetrates the first outer wall of the electrode terminal in the axial direction, and a third dimension of the electrode terminal = [1 / 3-2 / 3]*a fourth dimension of the electrode terminal.

[0032] The third dimension is the distance between the groove wall of the first groove section close to the first outer wall and the first outer wall in the axial direction; and the fourth dimension is the distance between the groove wall of the first groove section away from the first outer wall and the first outer wall in the axial direction.

[0033] In this way, the step structure formed by the first groove segment and the second groove segment has a proper size in the axial direction. In this way, on the one hand, the limiting groove does not occupy too much volume of the electrode terminal, so that the overcurrent capacity of the electrode terminal can be ensured to a certain extent. On the other hand, the step structure can axially limit the second limiting part more firmly, so that the limiting strength of the limiting member and the limiting groove in the radial direction can be improved, the combination strength of the insulating member and the electrode terminal is improved, and the risk of the electrode terminal being pulled out of the shell is reduced, and the reliability of the battery monomer is improved.

[0034] In some embodiments, the first groove segment is arranged on the peripheral wall of the electrode terminal and is distributed in the radial direction with the second groove segment; and the second limiting part is further limited in the axial direction in the second groove segment.

[0035] In this way, the second limiting part is limited in the second groove segment in the radial direction and the axial direction, respectively. In this way, the limiting strength of the limiting member and the limiting groove in the axial direction can be improved, so that the combination strength of the insulating member and the electrode terminal is improved, the risk of the electrode terminal being pulled out of the shell is reduced, and the reliability of the battery monomer is improved.

[0036] In some embodiments, the second groove segment penetrates the first outer wall of the electrode terminal in the axial direction, 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 first limiting part can be limited in the first groove segment in the axial direction and the radial direction, respectively. In this way, the limiting strength of the limiting member and the limiting groove in the radial direction can be improved, so that the combination strength of the insulating member and the electrode terminal is improved, the risk of the electrode terminal being pulled out of the shell is reduced, and the reliability of the battery monomer is improved.

[0038] In some embodiments, the electrode terminal includes a first terminal part and a second terminal part connected in the axial direction, and the radial size of the second terminal part is greater than the radial size of the first terminal part; the insulating body is arranged around the outer periphery of at least one of the first terminal part and the second terminal part, and the second terminal part is arranged on the first wall; the first groove segment is arranged between the peripheral wall of the first terminal part and one end of the second terminal part close to the first terminal part, and the second groove segment is arranged on the first terminal part and / or the second terminal part.

[0039] By adopting the above technical scheme, the limiting groove can be located between the first terminal part and the second terminal part, i.e., the limiting groove can be arranged on the electrode terminal in the axial direction, which helps to improve the combination strength between the electrode terminal and the insulating member, improve the combination strength of the insulating member and the electrode terminal, reduce the risk of the electrode terminal being pulled out of the shell, and improve the reliability of the battery monomer.

[0040] In some embodiments, the electrode terminal comprises a first terminal portion and a second terminal portion connected in the axial direction, the radial dimension of the second terminal portion is greater than that of the first terminal portion; the insulating body is arranged around the outer periphery of at least one of the first terminal portion and the second terminal portion, and the second terminal portion is arranged on the first wall; the second slot section is arranged at one end of the second terminal portion close to the first terminal portion in the axial direction, and the first slot section is arranged on the second terminal portion.

[0041] In this way, the limiting slot can be arranged between the first terminal portion and the second terminal portion, i.e., the limiting slot can be arranged centrally on the electrode terminal in the axial direction, which helps to improve the bonding strength between the electrode terminal and the insulating member, to improve the bonding strength between the insulating member and the electrode terminal, and to reduce the risk of the electrode terminal being pulled out of the shell, thereby improving the reliability of the battery cell.

[0042] In some embodiments, the at least one limiting slot is a second limiting slot, and the second limiting slot is arranged on the peripheral wall of the electrode terminal; in the radial direction of the electrode terminal, the cross-sectional area of the second limiting slot perpendicular to the radial direction is arranged to gradually decrease towards the peripheral wall of the electrode terminal.

[0043] In this way, the slot wall of the second limiting slot can achieve radial limiting of the limiting member. In this way, the first limiting slot 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 insulating member, to improve the bonding strength between the insulating member and the electrode terminal, and to reduce the risk of the electrode terminal being pulled out of the shell, thereby improving the reliability of the battery cell.

[0044] In some embodiments, the axial dimension of the second limiting slot is arranged to gradually decrease towards the peripheral wall of the electrode terminal in the radial direction.

[0045] And / or, the number of second limiting slots is a plurality, the plurality of second limiting slots are spaced apart in the circumferential direction of the electrode terminal, and the circumferential dimension of the second limiting slot is arranged to gradually decrease towards the peripheral wall of the electrode terminal in the radial direction.

[0046] By adopting the above technical solutions, in the direction of the second limiting slot towards the peripheral wall of the electrode terminal in the radial direction, the cross-sectional area of the second limiting slot perpendicular to the radial direction can be arranged to gradually decrease, so that the slot wall of the second limiting slot can achieve radial limiting of the limiting member. In this way, it helps to improve the bonding strength between the electrode terminal and the insulating member, to improve the bonding strength between the insulating member and the electrode terminal, and to reduce the risk of the electrode terminal being pulled out of the shell, thereby improving the reliability of the battery cell.

[0047] In some embodiments, the slot walls on the two sides of the second limiting slot in the axial direction are arranged to gradually taper towards the peripheral wall of the electrode terminal in the radial direction.

[0048] And / or, the number of the second limiting grooves is multiple, the multiple second limiting grooves are distributed along the circumference of the electrode terminal, and the two circumferentially opposite groove walls of the second limiting groove are arranged to taper radially towards the outer circumferential wall of the electrode terminal.

[0049] By adopting the above technical scheme, the limiting strength of the second limiting groove on the limiting member in the radial direction can be improved, so as to improve the combination strength between the electrode terminal and the insulating member.

[0050] In some embodiments, the fifth size of the second limiting groove = [0.6-0.9]*the sixth size of the second limiting groove;

[0051] The fifth size is the axial size of the second limiting groove at one end of the outer circumferential wall of the electrode terminal, and the sixth size is the axial size of the second limiting groove away from one end of the outer circumferential wall of the electrode terminal in the radial direction.

[0052] In this way, the limiting member can be effectively limited in the second limiting groove in the radial direction. Moreover, the tapering at the outer circumferential wall of the electrode terminal of the second limiting groove is arranged to be too small, so as to facilitate the limiting member to enter the second limiting groove.

[0053] In some embodiments, the seventh size of the second limiting groove = [0.6-0.9]*the eighth size of the second limiting groove;

[0054] The seventh size is the circumferential size of the second limiting groove at one end of the outer circumferential wall of the electrode terminal, and the eighth size is the circumferential size of the second limiting groove away from one end of the outer circumferential wall of the electrode terminal in the radial direction.

[0055] In this way, the limiting member can be effectively limited in the second limiting groove in the radial direction. Moreover, the tapering at the outer circumferential wall of the electrode terminal of the second limiting groove is arranged to be too small, so as to facilitate the limiting member to enter the second limiting groove.

[0056] In some embodiments, the electrode terminal comprises a first terminal part and a second terminal part connected in the axial direction, the radial size of the second terminal part is greater than that of the first terminal part; the insulating body is arranged around the outer periphery of at least one of the first terminal part and the second terminal part, and the second terminal part is arranged on the first wall; the limiting groove is arranged on the first terminal part, and / or the limiting groove is arranged on the second terminal.

[0057] In this way, the second terminal part protrudes in the radial direction from the first terminal part. In this way, when the insulating body is sleeved on the outer periphery of the first terminal part, the insulating body can limit the part of the second terminal part protruding from the first terminal part in the axial direction, so as to improve the limiting of the insulating member and the electrode terminal in the axial direction, thereby improving the combination strength between the electrode terminal and the insulating member.

[0058] In some embodiments, the limiting groove is arranged on the first terminal part, and an axial dimension of the limiting groove is equal to [1 / 3-2 / 3] of an axial dimension of the first terminal part.

[0059] Alternatively, the limiting groove is arranged on the second terminal part, and an axial dimension of the limiting groove is equal to [1 / 3-2 / 3] of an axial dimension of the second terminal part.

[0060] Alternatively, a part of the limiting groove is arranged on the first terminal part, and a part of the limiting groove is arranged on the second terminal part, and an axial dimension of the limiting groove is equal to [1 / 3-2 / 3] of a sum of axial dimensions of the first terminal part and the second terminal part.

[0061] In this way, the limiting groove occupies a relatively appropriate dimension proportion of the electrode terminal in the axial direction, so that the limiting groove can effectively limit the limiting member and, at the same time, ensure the structural strength and flow capacity of the first terminal part to a certain extent.

[0062] In some embodiments, the electrode terminal further comprises a third terminal part arranged at an end of the first terminal part away from the second terminal part in the axial direction, and a radial dimension of the third terminal part is smaller than a radial dimension of the first terminal part.

[0063] In the radial direction of the electrode terminal, the limiting groove protrudes from or is flush with the groove wall away from the peripheral wall of the electrode terminal, or in the radial direction of the electrode terminal, the third terminal part protrudes from the groove wall of the limiting groove away from the peripheral wall of the electrode terminal, and in the axial direction, a distance between an end of the limiting groove close to the third terminal part and an end of the third terminal part away from the first terminal part is greater than or equal to 1 mm.

[0064] In this way, when the third terminal part is welded with the external conductive part, the problem of damaging the limiting groove during welding can be improved, the welding of the third terminal part can be ensured to a certain extent, and the limiting groove can effectively limit the limiting member.

[0065] In some embodiments, in the radial direction, the third terminal part protrudes from the groove wall of the limiting groove away from the peripheral wall of the electrode terminal, and in the axial direction, a distance between the groove wall of the limiting groove close to the third terminal part and an end of the third terminal part away from the first terminal part ranges from 1.5 mm to 3.5 mm.

[0066] In this way, in the axial direction, the groove wall of the limiting groove close to the third terminal part and the end of the third terminal part away from the first terminal part have a relatively appropriate distance, which can improve the problem of damaging the limiting groove during welding of the third terminal part, and at the same time, the limiting groove can occupy a relatively appropriate dimension proportion of the electrode terminal in the axial direction, so that the limiting groove can effectively limit the limiting member.

[0067] In some embodiments, the battery cell further comprises a connecting piece arranged at the outer periphery of the electrode terminal; the insulating body is connected to the connecting piece and separates the electrode terminal and the connecting piece; the connecting piece is connected to the first wall; and the connecting piece is located at one end of the second terminal portion which is axially close to the first terminal portion.

[0068] By locating the connecting piece at one end of the second terminal portion which is axially close to the first terminal portion, the connecting piece and the insulating body can axially limit the part of the second terminal portion which protrudes from the first terminal portion, so that the electrode terminal and the shell can be axially limited, the bonding strength between the electrode terminal and the shell is improved, and the problem of the electrode terminal being pulled out of the shell is solved.

[0069] In some embodiments, the insulating body comprises a first insulating portion, a second insulating portion and a third insulating portion; the first insulating portion is arranged between the first wall and the electrode terminal and surrounds the outer periphery of the electrode terminal; the second insulating portion and the third insulating portion are arranged on the inner peripheral wall of the first insulating portion in an axial direction; the limiting piece is connected to the second insulating portion; and the part of the second terminal portion is axially limited between the second insulating portion and the third insulating portion.

[0070] In this way, the second terminal portion and the insulating body can be axially limited. In this way, the relative position of the electrode terminal and the insulating body in the axial direction can be improved, so that the bonding strength between the electrode terminal and the insulating body is improved, and the risk of the electrode terminal being pulled out of the shell is reduced.

[0071] In some embodiments, the insulating piece is injection molded to the electrode terminal.

[0072] In this way, the limiting piece of the insulating piece can be fully inserted into the limiting groove, so that a very firm and stable limiting relationship is formed between the limiting piece and the limiting groove. In this way, the bonding strength between the electrode terminal and the insulating piece is improved, and the risk of the electrode terminal being pulled out of the shell is reduced. In addition, the connection of the insulating piece with the connecting piece and the electrode terminal can be easily achieved.

[0073] In a second aspect, the embodiments of the present application provide a battery, comprising the battery cell.

[0074] The battery provided by the embodiments of the present application can improve the bonding strength between the insulating piece and the electrode terminal, reduce the risk of the electrode terminal being pulled out of the insulating piece, i.e., reduce the risk of the electrode terminal being pulled out of the shell, improve the reliability of the battery cell, and thus improve the reliability of the battery.

[0075] In a third aspect, the embodiments of the present application provide a power consumption device, comprising the battery.

[0076] The power utilization device provided by the embodiments of the present application can improve the stability and reliability of the battery by using the battery, thereby improving the reliability of the power utilization device.

[0077] 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, and can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0078] 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 any creative labor.

[0079] Fig. 1 is a schematic diagram of a vehicle provided by some embodiments of the present application;

[0080] Fig. 2 is an exploded view of a battery provided by some embodiments of the present application;

[0081] Fig. 3 is a perspective view of a battery cell provided by some embodiments of the present application;

[0082] Fig. 4 is an exploded view of a battery cell provided by some embodiments of the present application;

[0083] Fig. 5 is a perspective view of an electrode terminal, an insulating piece and a connecting piece of the battery cell provided by Fig. 3;

[0084] Fig. 6 is a sectional view of Fig. 5 along A-A;

[0085] Fig. 7 is an enlarged view of B in Fig. 6;

[0086] Fig. 8 is a sectional view of the electrode terminal in Fig. 6;

[0087] Fig. 9 is an enlarged view of C in Fig. 8;

[0088] Fig. 10 is a sectional view of the insulating piece in Fig. 6;

[0089] Fig. 11 is an enlarged view of D in Fig. 10;

[0090] Fig. 12 is an exploded view of Fig. 5;

[0091] Fig. 13 is an enlarged view of E in Fig. 12;

[0092] Fig. 14 is a schematic diagram of an electrode terminal, an insulating piece and a connecting piece of a battery cell provided by another embodiment of the present application;

[0093] Fig. 15 is a sectional view of Fig. 14 along F-F;

[0094] Fig. 16 is an enlarged view of G in Fig. 15;

[0095] Fig. 17 is a front view of Fig. 14;

[0096] Fig. 18 is a sectional view of Fig. 17 along H-H;

[0097] Fig. 19 is an enlarged view of I in Fig. 18;

[0098] Fig. 20 is an enlarged sectional view of the electrode terminal of Fig. 19;

[0099] Fig. 21 is an enlarged sectional view of the insulating member of Fig. 19;

[0100] Fig. 22 is a sectional view of an electrode terminal of a battery cell according to yet other embodiments of the application;

[0101] Fig. 23 is an enlarged view of J in Fig. 22;

[0102] Fig. 24 is an exploded view of an electrode terminal, an insulating member and a connecting member of a battery cell according to still other embodiments of the application;

[0103] Fig. 25 is a fitted sectional view of Fig. 24;

[0104] Fig. 26 is an enlarged view of K in Fig. 25;

[0105] Fig. 27 is an enlarged sectional view of the electrode terminal of Fig. 26;

[0106] Fig. 28 is an enlarged sectional view of the insulating member of Fig. 26;

[0107] Fig. 29 is a sectional view of an electrode terminal, an insulating member and a connecting member of a battery cell according to other embodiments of the application;

[0108] Fig. 30 is an enlarged view of L in Fig. 29.

[0109] In the drawings: 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-battery monomer; 20-box; 210-first part; 220-second part; 1-electrode assembly; 2-casing; 21-casing; 22-end cover; 221-first wall; 3-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; 3023-eleventh groove wall; 3024-twelfth groove wall; 302-first outer wall; 303-step structure; 31-first terminal part; 32-second terminal part; 33-third terminal part; 4-insulating piece; 401-constraint groove; 41-insulating body; 411-first insulating part; 412-second insulating part; 413-third insulating part; 42-limiting piece; 421-first limiting part; 422-second limiting part; 5-connection piece; 6-adapter structure; 7-lower plastic; 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-fifth dimension; L11-sixth dimension; Z-axial direction; Y-circumferential direction; X-radial direction. DETAILED DESCRIPTION

[0110] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0111] All embodiments and optional embodiments of the embodiments of the present application can be combined with each other to form new technical solutions if not specifically stated.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also 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.

[0117] 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 exists. In addition, in the present application, the character " / ", generally represents that the front and rear associated objects are in an "or" relationship.

[0118] 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.

[0119] 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.

[0120] In the process of charging and discharging cycle, collision test and the like of the battery cell, the electrode terminal is 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 failure of the connection relationship between the electrode terminal and the electrode assembly.

[0121] For example, in some cases, the battery cell can further include an insulating piece and a connecting piece, the insulating piece is sleeved on the outer periphery of the electrode terminal, the connecting piece is sleeved on the outer periphery of the electrode terminal, the insulating piece is connected to the connecting piece, and the electrode terminal and the connecting piece are separated. The connecting piece is connected to the shell to fix the electrode terminal on the shell. When the electrode terminal is stressed, the connection relationship between the electrode terminal and the insulating piece is easily failed, so that the electrode terminal is separated from the insulating piece, thereby causing the electrode terminal to be separated from the shell.

[0122] Based on the above considerations, the battery cell, the battery and the power utilization device provided by the embodiments of the present application are provided. The limiting piece of the 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 insulating piece and the electrode terminal are limited in the axial direction. In this way, the bonding strength between the insulating piece and the electrode terminal can be improved, the risk of the electrode terminal being separated from the insulating piece can be reduced, that is, the risk of the electrode terminal being separated from the shell can be reduced, and the reliability of the battery cell can be improved.

[0123] In some embodiments, the battery cell related to the embodiments of the present application can be used in a power utilization device using the battery cell or the battery as a power source.

[0124] The power utilization device related to the embodiments of the present application can be, but is not limited to, a mobile phone, a tablet, 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 plane 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 car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid electric car or a range extended car and the like. According to the driving mode, the vehicle can be a front-wheel drive car, a rear-wheel drive car or a four-wheel drive car.

[0125] In other embodiments, the battery cell related to the embodiments of the present application can also be used in an energy storage system using the battery cell 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.

[0126] The battery according to embodiments of the present application can be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in a mixed connection, where the mixed connection means that there are both series and parallel connections among the multiple battery cells.

[0127] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. In some embodiments, the battery can be a battery pack, which 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 arranged to form a battery module, and then accommodated in the box.

[0128] As an example, the multiple battery cells can be fixed to form a battery module by a cable tie or the like.

[0129] As an example, the multiple battery cells can also be fixed to form a battery module by an end plate, a side plate, or the like.

[0130] The battery cell according to embodiments of the present application refers to the smallest unit that stores and outputs 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.

[0131] For ease of description, embodiments of the present application take a vehicle as an example for description.

[0132] In some embodiments, referring to FIG. 1, FIG. 1 is a schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 is internally provided with the battery 100 described above, which 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 source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, where 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.

[0133] In some embodiments, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0134] In some embodiments, referring to FIG. 2, an exploded view of a battery 100 is provided. The battery 100 can include a case 20 and a battery cell 10. The case 20 is a structure having an internal space for accommodating the battery cell 10.

[0135] The case 20 can have various structures. In some embodiments, the case 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 case 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 coupled to the opening side of the first part 210 to define the internal space of the case 20 together with the first part 210. Alternatively, referring to FIG. 2, the first part 210 and the second part 220 can each be a hollow structure having an opening at one end, and the opening side of the first part 210 can be coupled to the opening side of the second part 220 to define the internal space of the case 20 together with the first part 210 and the second part 220. The case 20 formed by the first part 210 and the second part 220 can have various shapes, such as a cylinder, a cuboid, etc.

[0136] In some embodiments, referring to FIG. 2, a plurality of battery cells 10 can be connected in series, in parallel, or in a mixed connection to form a whole, and then the whole formed by the plurality of battery cells 10 can be directly accommodated in the internal space of the case 20. In other embodiments, the plurality of battery cells 10 can be connected in series, in parallel, or in a mixed connection and arranged and fixed to form a battery module, and then the battery module can be accommodated in the internal space of the case 20. In yet other embodiments, the plurality of battery cells 10 can be connected in series, in parallel, or in a mixed connection and arranged and fixed to form a plurality of battery modules, and then the plurality of battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, and then the whole can be accommodated in the internal space of the case 20.

[0137] In some embodiments, the case 20 of the battery 100 can be a part of a chassis structure of a vehicle 1000. For example, a part of the case 20 can be at least a part of the chassis of the vehicle 1000, or a part of the case 20 can be at least a part of a cross beam and a longitudinal beam of the vehicle 1000.

[0138] In some embodiments, referring to FIGS. 3 and 4, a perspective view of a battery cell 10 is provided. The battery cell 10 can include an electrode assembly 1, a case 2, and an electrode terminal 3.

[0139] 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. 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.

[0140] In the battery cell 10, the number of electrode assemblies 1 can be one or multiple.

[0141] In some cases, the electrode assembly 1 can also be referred to as a bare cell, a winding body, a stacking body, etc.

[0142] 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.

[0143] 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.

[0144] The shell 2 can be a sealed structure or a non-sealed structure. As an example, when the shell 2 is a sealed structure, the shell 2 can play a role in protecting the electrode assembly 1 and preventing electrolyte leakage to some extent. As an example, when the shell 2 is a non-sealed structure, the shell 2 can play a role in protecting the electrode assembly 1, and the shell 2 and the electrode assembly 1 can further include a sealing bag for packaging the electrode assembly 1 and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating structure, an aluminum plastic film, etc.

[0145] 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. 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 after the electrode assembly 1 is put into the shell, the end cover 22 is closed to the shell body 21 when the electrode assembly 1 needs to be packaged.

[0146] The number of the end cover 22 can be one, as shown in FIG. 3 and FIG. 4. Alternatively, the number of the end cover 22 can also be two, and the two end covers 22 are respectively arranged at opposite ends of the shell 21.

[0147] The shell 21 can be cylindrical, square, etc., and can be determined according to the specific shape and size of the electrode assembly 1. In addition, the materials of the shell 21 and the end cover 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0148] The electrode terminal 3 refers to a structure with 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.

[0149] 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, etc. Alternatively, as shown in FIG. 4, an adapter structure 6 can be arranged between the electrode terminal 3 and the tab, the adapter structure 6 is connected to the electrode terminal 3 and the tab, and the adapter structure 6 realizes the connection 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.

[0150] The adapter structure 6 refers to a metal structure with conductive performance, for example, but not limited to, a copper bar.

[0151] In some embodiments, referring to FIG. 4, the electrode terminal 3 is provided in two, and the two electrode terminals 3 are respectively a positive electrode terminal and a negative electrode terminal. The positive electrode terminal is in conductive connection with the positive tab of the electrode assembly 1, and the negative electrode terminal is in conductive connection with the negative tab of the electrode assembly 1.

[0152] The electrode terminal 3 can be arranged on the shell 21 of the shell 2, or can be arranged on the end cover 22 of the shell 2. The positive electrode terminal and the negative electrode terminal can be arranged on the shell 21 at the same time. Alternatively, as shown in FIG. 4, the positive electrode terminal and the negative electrode terminal can be arranged on the end cover 22 at the same time. Alternatively, one of the positive electrode terminal and the negative electrode terminal is arranged on the shell 21, and the other is arranged on the end cover 22.

[0153] As shown in FIG. 4, the positive electrode terminal and the negative electrode terminal can be arranged at the same end of the shell 2. Alternatively, the positive electrode terminal and the negative electrode terminal can be arranged at opposite ends of the shell 2.

[0154] The electrode terminal 3 can be made of metal material, which can be but is not limited to a pole. As an example, the positive electrode terminal is an aluminum pole made of aluminum material, and the negative electrode terminal is a composite pole made of aluminum and copper material. The copper material of the negative electrode terminal is used to connect with the tab.

[0155] In some embodiments, referring to FIG. 4, the battery cell 10 can further include a lower plastic 7, which is arranged in the shell 2 and between the shell 2 and the main body of the electrode assembly 1 to achieve insulation between the shell 2 and the electrode assembly 1.

[0156] Referring to FIGS. 3-13, and in combination with other drawings. FIG. 5 is a perspective view of the electrode terminal 3, the insulating member 4 and the connecting member 5 of the battery cell 10 provided in FIG. 3, FIG. 6 is a sectional view of FIG. 5 along A-A, FIG. 7 is an enlarged view of B in FIG. 6, FIG. 8 is a sectional view of the electrode terminal 3 in FIG. 6, FIG. 9 is an enlarged view of C in FIG. 8, FIG. 10 is a sectional view of the insulating member 4 in FIG. 6, FIG. 11 is an enlarged view of D in FIG. 10, FIG. 12 is an exploded view of FIG. 5, and FIG. 13 is an enlarged view of E in FIG. 12. The battery cell 10 provided in the embodiments includes the shell 2, the electrode terminal 3 and the insulating member 4. The shell 2 includes a first wall 221. The electrode terminal 3 is arranged on the first wall 221 and provided with a limiting groove 301. The insulating member 4 includes an insulating body 41 and a limiting member 42 connected to the insulating body 41. At least part of the insulating body 41 is arranged between the electrode terminal 3 and the first wall 221, and at least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3. The limiting member 42 cooperates with the limiting groove 301 to form a limit between the limiting member 42 and the limiting groove 301 in the axial direction Z of the electrode terminal 3.

[0157] The first wall 221 is an entity wall on the shell 2 for arranging the electrode terminal 3. As shown in FIGS. 3 and 4, the end cover 22 of the shell 2 can be provided with the first wall 221, and the shell 21 of the shell 2 can also be provided with the first wall 221.

[0158] The limiting groove 301 is a groove on the electrode terminal 3 for limiting the insulating member 4.

[0159] The insulating member 4 is a component with insulation performance for achieving the insulation effect between the first wall 221 of the shell 2 and the electrode terminal 3. The insulating member 4 can be but is not limited to a plastic component.

[0160] The insulating body 41 is the main body part of the insulating member 4, and the limiting member 42 is the part on the insulating member 4 for cooperating with the limiting groove 301. The insulating body 41 and the limiting member 42 both have insulation performance.

[0161] At least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3, which means that at least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3 and connected to the electrode terminal 3.

[0162] At least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3, which means that at least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3 and connected to the electrode terminal 3.

[0163] At least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3, which means that at least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3 and connected to the electrode terminal 3.

[0164] At least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3, which means that at least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3 and connected to the electrode terminal 3.

[0165] At least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3, which means that at least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3 and connected to the electrode terminal 3.

[0166] At least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3, which means that at least part of the insulating body 41 is arranged around the outer periphery of the electrode terminal 3 and connected to the electrode terminal 3.

[0167] The electrode terminal 3 is arranged on the first wall 221, specifically, the electrode terminal 3 is connected to the first wall 221 of the shell 2 through the insulating piece 4, specifically, the insulating body 41 of the insulating piece 4 is connected to the first wall 221 of the shell 2. In some possible designs, the insulating body 41 can be directly connected to the first wall 221. In some possible designs, the insulating body 41 and the shell 2 can also be provided with the connecting piece 5 referred to below, and the insulating body 41 is connected to the first wall 221 through the connecting piece 5, achieving indirect connection between the insulating body 41 and the first wall 221.

[0168] The limiting piece 42 cooperates with the limiting groove 301 to form limiting in the axial direction Z of the electrode terminal 3, which means that the limiting piece 42 is inserted into the limiting groove 301, and the two ends of the limiting piece 42 in the axial direction Z can be correspondingly limited by the two side groove walls of the limiting groove 301 in the axial direction Z, so that the limiting piece 42 can be limited between the two side groove walls of the limiting groove 301 in the axial direction Z, thereby forming limiting between the limiting piece 42 and the limiting groove 301 in the axial direction Z, and further achieving limiting of the insulating piece 4 and the electrode terminal 3 in the axial direction Z.

[0169] The battery monomer 10 provided by the embodiment of the application is limited and cooperated by the limiting piece 42 of the insulating piece 4 and the limiting groove 301 of the electrode terminal 3 in the axial direction Z of the electrode terminal 3, so that the insulating piece 4 and the electrode terminal 3 are limited in the axial direction Z. In this way, the bonding strength between the insulating piece 4 and the electrode terminal 3 can be improved, and the risk of the electrode terminal 3 being pulled out of the insulating piece 4, that is, the risk of the electrode terminal 3 being pulled out of the shell 2, is reduced, and the reliability of the battery monomer 10 is improved.

[0170] In addition, at least part of the insulating body 41 surrounds the outer periphery of the electrode terminal 3, so that the electrode terminal 3 is limited in the radial direction X in the insulating body 41, thereby enabling the electrode terminal 3 and the insulating piece 4 to have better bonding strength.

[0171] In some embodiments, the shell 2 can be provided with a lead-out hole. The electrode terminal 3 is arranged in the lead-out hole; or the electrode terminal 3 and the lead-out hole are arranged opposite to each other. In this way, the electrode terminal 3 can be connected to the electrode assembly 1 through the lead-out hole.

[0172] It should be noted here that the battery monomer 10 can also include the electrode assembly 1, and the electrode assembly 1 is arranged in the shell 2.

[0173] In some embodiments, please refer to FIGS. 6-13, and in combination with other drawings. At least one limiting groove 301 is a first limiting groove 301a. 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 member 42 includes a first limiting portion 421 and a second limiting portion 422 connected to the first limiting portion 421, and at least one of the first limiting portion 421 and the second limiting portion 422 is connected to the insulating body 41. The first limiting portion 421 is limited in the first groove segment 3011 along the axial direction Z, and the second limiting portion 422 is limited in the second groove segment 3012 along the radial direction X of the electrode terminal 3.

[0174] The first groove segment 3011 and the second groove segment 3012 are two segments of the limiting groove 301. Among them, the first groove segment 3011 and the second groove segment 3012 can be distributed along the radial direction X, or along the axial direction Z, or along other directions.

[0175] The first limiting portion 421 and the second limiting portion 422 are two parts of the limiting member 42.

[0176] It can be understood that the first groove segment 3011 has two side groove walls opposite along the axial direction Z, which are respectively a first groove wall 3013 and a second groove wall 3014. The first limiting portion 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.

[0177] The second groove segment 3012 has two side groove walls opposite along the radial direction X, which are respectively a third groove wall 3015 and a fourth groove wall 3016. The second limiting portion 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.

[0178] By adopting the above technical solution, the limiting member 42 can be limited in the limiting groove 301 along the axial direction Z and the radial direction X, so that the limiting strength of the limiting member 42 on the electrode terminal 3 can be improved, thereby improving the combination strength of the insulating member 4 and the electrode terminal 3, and helping to reduce the risk of the electrode terminal 3 being separated from the insulating member 4, i.e., the risk of the electrode terminal 3 being separated from the shell 2, and improving the reliability of the battery monomer 10.

[0179] In some embodiments, please refer to FIGS. 9 and 13, and in combination with other drawings. The second groove segment 3012 can be arranged in a bent manner relative to the first groove 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 groove segment 3011 along the axial direction Z, and the second limiting portion 422 is limited in the second groove segment 3012 along the radial direction X.

[0180] In some embodiments, please refer to FIG. 9 and FIG. 13, and combine with other figures. The first groove segment 3011 and the second groove 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.

[0181] In some embodiments, please refer to FIG. 6 to FIG. 13, and combine with other figures. In the axial direction Z, the second groove segment 3012 protrudes from at least one side of the first groove segment 3011.

[0182] In some embodiments, please refer to FIG. 6 to FIG. 13, and combine with other figures. In the axial direction Z, the second groove segment 3012 protrudes from at least one side of the first groove segment 3011.

[0183] Specifically, the second groove segment 3012 is arranged to extend in the axial direction Z to protrude from the first groove segment 3011, so that a stepped structure 303 is formed between the first groove segment 3011 and the second groove segment 3012, and the stepped structure 303 and the first groove segment 3011 are distributed along the axial direction Z. And the first groove wall 3013 and the third groove wall 3015 are both arranged on the stepped structure 303.

[0184] By protruding from at least one side of the first groove segment 3011 in the axial direction Z, the second groove segment 3012 can be used to limit the second limiting portion 422 in the radial direction X, thereby improving the bonding strength of the insulating member 4 and the electrode terminal 3, 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.

[0185] In some embodiments, please refer to FIG. 6 to FIG. 13, and combine with other figures. In the axial direction Z, the second limiting portion 422 protrudes from at least one side of the first limiting portion 421.

[0186] In this way, the first limiting portion 421 can be adaptively limited in the first groove segment 3011, and the second limiting portion 422 can be adaptively limited in the second groove segment 3012. Thus, the bonding strength of the insulating member 4 and the electrode terminal 3 can be improved, 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.

[0187] In some embodiments, please refer to FIGS. 14-18, 24 and 25, and combine with other drawings. FIG. 14 is a schematic view of the electrode terminal 3, the insulating piece 4 and the connecting piece 5 of the battery cell 10 according to some other embodiments of the application, in which the electrode terminal 3, the insulating piece 4 and the connecting piece 5 are all perpendicular to the axial direction Z. FIG. 15 is a sectional view of FIG. 14 along F-F, and FIG. 16 is an enlarged view of G in FIG. 15. FIG. 17 is a front view of FIG. 14, in which the electrode terminal 3, the insulating piece 4 and the connecting piece 5 are all parallel to the axial direction Z. FIG. 18 is a sectional view of FIG. 17 along H-H. FIG. 24 is an exploded view of the electrode terminal 3, the insulating piece 4 and the connecting piece 5 of the battery cell 10 according to some other embodiments of the application, and FIG. 25 is a fitting sectional view of FIG. 24. In FIG. 25, the electrode terminal 3, the insulating piece 4 and the connecting piece 5 are all perpendicular to the axial direction Z. The number of the limiting grooves 301 is plural, and the plural limiting grooves 301 are spaced apart along the circumferential direction Y of the electrode terminal 3.

[0188] Correspondingly, the number of the limiting pieces 42 is also plural, and the plural limiting pieces 42 are spaced apart on the insulating body 41 along the circumferential direction Y and respectively correspondingly limited in the plural limiting grooves 301 along the circumferential direction Y.

[0189] In this way, by being limited in the limiting grooves 301 by the limiting pieces 42, the relative limitation of the electrode terminal 3 and the insulating piece 4 in the circumferential direction Y can be achieved to limit the relative rotation of the electrode terminal 3 and the insulating piece 4 in the circumferential direction Y, so as to improve the combination strength of the electrode terminal 3 and the insulating piece 4 and reduce the risk of the electrode terminal 3 being separated from the insulating piece 4, thereby reducing the risk of the electrode terminal 3 being separated from the shell 2.

[0190] In some embodiments, please refer to FIGS. 18 and 25, and combine with other drawings. 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.

[0191] It can be understood that, in some possible designs, as shown in FIGS. 18 and 25, the first limiting part 421 is limited in the first groove segment 3011 along the circumferential direction Y, and the second limiting part 422 is limited in the second groove segment 3012 along the circumferential direction Y. Alternatively, in some other possible designs, the first limiting part 421 is limited in the first groove segment 3011 along the circumferential direction Y, and the second limiting part 422 is not limited in the second groove segment 3012 along the circumferential direction Y. Alternatively, in some other possible designs, the second limiting part 422 is limited in the second groove segment 3012 along the circumferential direction Y, and the first limiting part 421 is not limited in the first groove segment 3011 along the circumferential direction Y.

[0192] In this way, the limiting member 42 is limited in the circumferential direction Y in the limiting groove 301, so that the relative limiting of the electrode terminal 3 and the insulating member 4 in the circumferential direction Y can be achieved. That is, the relative rotation of the electrode terminal 3 and the insulating member 4 can be limited. In this way, the bonding strength of the insulating member 4 and the electrode terminal 3 can be improved, 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.

[0193] In some embodiments, please refer to FIGS. 18-21, and in combination with other drawings. Among them, FIG. 19 is an enlarged view of I in FIG. 18, FIG. 20 is an enlarged sectional view of the electrode terminal 3 of FIG. 19, and FIG. 21 is an enlarged sectional view of the insulating member 4 of FIG. 19. In the circumferential direction Y, the second groove segment 3012 protrudes from at least one side of the first groove segment 3011.

[0194] Among them, the second groove segment 3012 can protrude from one side of the first groove segment 3011 in the circumferential direction Y. Alternatively, as shown in FIGS. 18-21, the second groove segment 3012 can also protrude from opposite sides of the first groove segment 3011 in the circumferential direction Y.

[0195] Specifically, the second groove segment 3012 is arranged to extend in the circumferential direction Y to protrude from the first groove segment 3011, so that a stepped structure 303 is formed between the first groove segment 3011 and the second groove segment 3012, and the stepped structure 303 and the first groove segment 3011 are distributed in the circumferential direction Y. And the third groove wall 3015 is arranged on the stepped structure 303.

[0196] By protruding from at least one side of the first groove segment 3011 in the circumferential direction Y, the second groove segment 3012 can be used to limit the second limiting portion 422 in the radial direction X, thereby improving the bonding strength of the 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.

[0197] In some embodiments, please refer to FIGS. 18-21, and in combination with other drawings. In the circumferential direction Y, the second limiting portion 422 protrudes from at least one side of the first limiting portion 421.

[0198] In this way, the first limiting portion 421 can be adaptively limited in the first groove segment 3011, and the second limiting portion 422 can be adaptively limited in the second groove segment 3012. Thus, the bonding strength of the insulating member 4 and the electrode terminal 3 can be improved, 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.

[0199] In some embodiments, please refer to FIGS. 6-13 and 18-21, and in combination with other drawings. The first groove segment 3011 is arranged on the outer circumferential wall of the electrode terminal 3.

[0200] It can be understood that the first slot segment 3011 penetrates the outer peripheral wall of the electrode terminal 3 along the radial direction X to be exposed to the outer peripheral wall of the electrode terminal 3.

[0201] Based on this, the first limiting portion 421 can be connected to the inner peripheral wall of the insulating body 41, and the second limiting portion 422 is connected to the first connecting portion, so that the insulating body 41, the first limiting portion 421 and the second limiting portion 422 are distributed along the radial direction X.

[0202] In some embodiments, please refer to FIG. 22 and FIG. 23, and combine with other drawings. FIG. 22 is a cross-sectional view of the electrode terminal 3 of the battery cell 10 provided by some other embodiments of the present application, and FIG. 23 is an enlarged view of J in FIG. 22. The second slot segment 3012 penetrates the first outer wall 302 of the electrode terminal 3 along the axial direction Z.

[0203] It can be understood that the electrode terminal 3 is provided with the first outer wall 302 intersecting the axial direction Z. The first outer wall 302 is an outer wall of the electrode terminal 3. The second slot segment 3012 is arranged on the first outer wall 302.

[0204] Based on this, the second limiting portion 422 can be connected to the insulating body 41, and the first limiting portion 421 is connected to the second limiting portion 422.

[0205] By adopting the above technical solutions, the arrangement of the limiting slot 301 on the electrode terminal 3 is very flexible.

[0206] In some embodiments, please refer to FIG. 9 and FIG. 20, and combine with other drawings. The first slot segment 3011 is arranged on the outer peripheral wall of the electrode terminal 3, and the first slot segment 3011 and the second slot segment 3012 form a stepped structure 303, and the outer peripheral wall of the electrode terminal 3 is arranged on the stepped structure 303. The single-side dimension of the stepped structure 303 along the radial direction X is a first dimension L1, and the single-side dimension of the limiting slot 301 along the radial direction X is a second dimension L2. The first dimension L1 = [1 / 3, 2 / 3] * the second dimension L2.

[0207] As an example, as shown in FIG. 9 and FIG. 20, the first slot segment 3011 and the second slot segment 3012 are distributed along the radial direction X. Moreover, the first dimension L1 is also the radial dimension of the first slot segment 3011, and the second dimension L2 is also the radial dimension of the second slot segment 3012.

[0208] In the embodiments of the present application, the radial dimension of the limiting slot 301 refers to the single-side dimension of the limiting slot 301 along the radial direction X. Correspondingly, the radial dimension of the first slot segment 3011 and the radial dimension of the second slot segment 3012 are respectively the single-side dimension of the first slot segment 3011 along the radial direction X and the single-side dimension of the second slot segment 3012 along the radial direction X.

[0209] This design ensures that the stepped structure 303 formed by the first groove segment 3011 and the second groove segment 3012 has a suitable size in the radial direction X. This serves two purposes: firstly, it prevents the limiting groove 301 from excessively occupying the volume of the electrode terminal 3, thus ensuring the current-carrying capacity of the electrode terminal 3 to a certain extent; secondly, the stepped structure 303 provides a more reliable limiting effect on the second limiting part 422 in the radial direction X, thereby improving the limiting strength of the limiting member 42 and the limiting groove 301 in the radial direction X. This enhances the bonding strength between the insulating member 4 and the electrode terminal 3, helps reduce the risk of the electrode terminal 3 detaching from the housing 2, and improves the reliability of the battery cell 10.

[0210] In some embodiments, please refer to Figures 22 and 23 together, and in conjunction with other figures. The second groove segment 3012 extends through the first outer wall 302 of the electrode terminal 3 along the Z-axis, and the third dimension L3 of the electrode terminal 3 is [1 / 3 to 2 / 3] * the fourth dimension L4 of the electrode terminal 3. Wherein, the third dimension L3 is the distance in the Z-axis between the groove wall of the first groove segment 3011 near the first outer wall 302 and the first outer wall 302. The fourth dimension L4 is the distance in the Z-axis between the groove wall of the first groove segment 3011 away from the first outer wall 302 and the first outer wall 302.

[0211] In the axial direction Z, the groove wall of the first groove segment 3011 near the first outer wall 302 is the aforementioned first groove wall 3013. In the axial direction Z, the groove wall of the first groove segment 3011 away from the first outer wall 302 is the aforementioned second groove wall 3014.

[0212] Understandably, the distance between the first groove wall 3013 and the first outer wall 302 in the axial Z direction is the third dimension L3, and the distance between the second groove wall 3014 and the first outer wall 302 in the axial Z direction is the fourth dimension L4.

[0213] Understandably, as shown in Figures 22 and 23, the first outer wall 302 is disposed on the stepped structure 303 formed between the first groove segment 3011 and the second groove segment 3012. The dimension of the stepped structure 303 in the axial Z direction is the third dimension L3, and the dimension of the limiting groove 301 in the axial Z direction is the fourth dimension L4.

[0214] As an example, as shown in Figures 22 and 23, the first slot segment 3011 and the second slot segment 3012 can be distributed along the axial direction Z. The third dimension L3 can also be the axial dimension of the second slot segment 3012, and the fourth dimension L4 can also be the axial dimension of the first slot segment 3011.

[0215] Wherein, the third dimension L3 < the fourth dimension L4, and the third dimension L3 = [1 / 3 ~ 2 / 3] * the fourth dimension L4. That is, the third dimension L3 ≥ 1 / 3 * the fourth dimension L4, and the third dimension L3 ≤ 2 / 3 * the fourth dimension L4.

[0216] In this way, the step structure 303 formed by the first groove segment 3011 and the second groove segment 3012 has a proper size in the axial direction Z. In this way, on the one hand, the limiting groove 301 does not excessively occupy the volume of the electrode terminal 3, so that the current carrying capacity of the electrode terminal 3 can be ensured to a certain extent. On the other hand, the step structure 303 can firmly limit the second limiting portion 422 in the axial direction Z, so that the limiting strength of the limiting member 42 and the limiting groove 301 in the radial direction X can be improved, so as to improve the bonding strength of the 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.

[0217] In some embodiments, please refer to FIGS. 7, 9, 11, 16, 19-21, and combine with other drawings. The first groove segment 3011 is arranged on the outer peripheral wall of the electrode terminal 3, the first groove segment 3011 and the second groove segment 3012 are distributed along the radial direction X, and the second limiting portion 422 is further limited in the second groove segment 3012 along the axial direction Z.

[0218] As can be understood, the second groove segment 3012 has two opposite groove walls in the axial direction Z, which are the fifth groove wall 3017 and the sixth groove wall 3018. The second limiting portion 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.

[0219] Specifically, 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, 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 electrode terminal 3.

[0220] As can be understood, the limiting groove 301 penetrates the outer peripheral wall of the electrode terminal 3 along the radial direction X, but does not penetrate the electrode terminal 3 along the axial direction Z.

[0221] In this way, the second limiting portion 422 is limited in the second groove segment 3012 along the radial direction X and the axial direction Z, respectively. In this way, the limiting strength of the limiting member 42 and the limiting groove 301 in the axial direction Z can be improved, so as to improve the bonding strength of the 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.

[0222] In some embodiments, please refer to FIGS. 22 and 23, and combine with other drawings. The second groove segment 3012 penetrates the first outer wall 302 of the electrode terminal 3 along the axial direction Z, the first groove segment 3011 and the second groove segment 3012 are distributed along the axial direction Z, and the first limiting portion 421 is further limited in the first groove segment 3011 along the radial direction X.

[0223] It can be understood that the first slot section 3011 has two side slot walls opposite along the radial direction X, which are respectively 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, thereby being limited in the first slot section 3011 along the radial direction X.

[0224] Specifically, 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, and the third slot wall 3015 and the fourth slot wall 3016 are arranged at intervals and are respectively connected to the first outer wall 302.

[0225] It can be understood that the limiting slot 301 penetrates the first outer wall 302 of the electrode terminal 3 along the axial direction Z, but does not penetrate the electrode terminal 3 along the radial direction X.

[0226] In this way, the first limiting part 421 can be limited in the first slot section 3011 along the axial direction Z and the radial direction X, respectively. In this way, the limiting strength of the limiting part 42 and the limiting slot 301 in the radial direction X can be improved, thereby improving the combination strength of the 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.

[0227] It needs to be added here that in the case that the limiting slot 301 penetrates the peripheral wall of the electrode terminal 3 along the radial direction X, but does not penetrate the electrode terminal 3 along the axial direction Z; or in the case that the limiting slot 301 penetrates the first outer wall 302 of the electrode terminal 3 along the axial direction Z, but does not penetrate the electrode terminal 3 along the radial direction X: in some possible designs, the limiting slot 301 can be arranged to extend along the circumferential direction Y to be substantially annular and surround the periphery of the electrode terminal 3. Based on this, the limiting part 42 can be arranged to extend along the circumferential direction Y to be substantially annular; or can be provided as a plurality of limiting parts 42, which are distributed at intervals along the circumferential direction Y. In other possible designs, the limiting slot 301 can be provided as a plurality of limiting slots 301, which are distributed at intervals along the circumferential direction Y. Based on this, the limiting part 42 is provided as a plurality of limiting parts 42, which are distributed at intervals along the circumferential direction Y, and the plurality of limiting parts 42 are correspondingly limited in the plurality of limiting slots 301.

[0228] In other embodiments, the limiting slot 301 can penetrate the peripheral wall of the electrode terminal 3 along the radial direction X and penetrate the electrode terminal 3 along the axial direction Z. Based on this, the number of limiting slots 301 is a plurality, and the plurality of limiting slots 301 are distributed at intervals along the circumferential direction Y to a certain extent to guarantee the structural integrity of the electrode terminal 3. Correspondingly, the limiting part 42 is provided as a plurality of limiting parts 42, which are distributed at intervals along the circumferential direction Y, and the plurality of limiting parts 42 are correspondingly limited in the plurality of limiting slots 301.

[0229] In some embodiments, please refer to Figs. 6-23, and in combination with other drawings. The electrode terminal 3 comprises a first terminal portion 31 and a second terminal portion 32 connected along the axial direction Z, and the radial dimension of the second terminal portion 32 is greater than that of the first terminal portion 31. The insulating body 41 is arranged around the outer periphery of the first terminal portion 31 and the second terminal portion 32; or the insulating body 41 is arranged around the outer periphery of the first terminal portion 31 but not around the outer periphery of the second terminal portion 32; or the insulating body 41 is arranged around the outer periphery of the second terminal portion 32 but not around the outer periphery of the first terminal portion 31. Moreover, the second terminal portion 32 is arranged on the first wall 221 and connected to the electrode assembly 1.

[0230] The second terminal portion 32 is arranged on the first wall 221, specifically, the second terminal portion 32 is directly or indirectly connected to the first wall 221 through the insulating body 41.

[0231] Wherein, the electrode terminal 3 can have a midpoint and a central axis. The central axis passes through the midpoint and is parallel to the axial direction Z. The radial direction X of the electrode terminal 3 intersects the central axis. When the cross section of the electrode terminal 3 parallel to the circumferential direction Y is non-circular, the radial dimension of the electrode terminal 3 is still the dimension of the electrode terminal 3 along the radial direction X passing through the central axis. The radial dimension of the first terminal portion 31, the radial dimension of the second terminal portion 32, and the radial dimension of the third terminal portion 33 below are the same.

[0232] It can be understood that the second terminal portion 32 protrudes from the first terminal portion 31 along the radial direction X.

[0233] Wherein, as shown in Figs. 6-21, the limiting groove 301 can be arranged on the first terminal portion 31. Or, as shown in Figs. 22 and 23, the limiting groove 301 can be arranged on the second terminal portion 32. Or, the limiting groove 301 can be arranged on the first terminal portion 31 and the second terminal portion 32.

[0234] Wherein, when the first groove segment 3011 is arranged on the outer peripheral wall of the electrode terminal 3, the first groove segment 3011 can be arranged on the outer peripheral wall of the first terminal portion 31, that is, the first groove segment 3011 penetrates the outer peripheral wall of the first terminal portion 31, as shown in Figs. 6-21; or the first groove segment 3011 can be arranged on the outer peripheral wall of the second terminal portion 32, that is, the first groove segment 3011 penetrates the outer peripheral wall of the second terminal portion 32.

[0235] The first outer wall 302 can be arranged at least one end of the first terminal portion 31 along the axial direction Z, and the first outer wall 302 can also be arranged at least one end of the second terminal portion 32 along the axial direction Z. As an example, as shown in FIGS. 22 and 23, the first outer wall 302 is arranged on the portion of the second terminal portion 32 protruding outside the first terminal portion 31, and the first outer wall 302 is arranged at the end of the second terminal portion 32 close to the first terminal portion 31 along the axial direction Z.

[0236] In some embodiments, referring to FIGS. 6-21, and in combination with other drawings. The first groove segment 3011 is arranged between the outer peripheral wall of the first terminal portion 31 and the end of the second terminal portion 32 close to the first terminal portion 31 along the axial direction Z, and the second groove segment 3012 is arranged on at least one of the first terminal portion 31 and the second terminal portion 32.

[0237] It can be understood that one of the first groove wall 3013 and the second groove wall 3014 of the first groove segment 3011 is arranged on the first terminal portion 31, and the other is arranged on the end of the second terminal portion 32 close to the first terminal portion 31 along the axial direction Z.

[0238] The second groove segment 3012 can be arranged on the first terminal portion 31, as shown in FIGS. 6-21; based on this, the step structure 303 formed between the first groove segment 3011 and the second groove segment 3012 can be arranged on the first terminal portion 31. The second groove segment 3012 can also be arranged on the first terminal portion 31 in part and arranged on the second terminal portion 32 in part; based on this, the step structure 303 formed between the first groove segment 3011 and the second groove segment 3012 can be arranged on the first terminal portion 31 or on the second terminal portion 32.

[0239] As an example, as shown in FIG. 9, the first groove wall 3013 of the first groove segment 3011 is arranged on the first terminal portion 31, and the second groove wall 3014 is arranged on the end of the second terminal portion 32 close to the first terminal portion 31 along the axial direction Z. The second groove segment 3012 is arranged on the first terminal portion 31, and the third groove wall 3015, the fourth groove wall 3016, and the fifth groove wall 3017 of the second groove segment 3012 are all arranged on the first terminal portion 31, and the sixth groove wall 3018 is arranged on the end of the second terminal portion 32 close to the first terminal portion 31 along the axial direction Z.

[0240] By adopting the above technical solution, the limiting groove 301 can be located between the first terminal portion 31 and the second terminal portion 32, that is, the limiting groove 301 can be arranged centrally on the electrode terminal 3 along the axial direction Z, which helps to improve the bonding strength between the electrode terminal 3 and the insulating piece 4, to improve the bonding strength between the insulating piece 4 and the electrode terminal 3, and to help reduce the risk of the electrode terminal 3 being pulled out of the shell 2, thereby improving the reliability of the battery monomer 10.

[0241] In some embodiments, please refer to FIG. 22 and FIG. 23, and combine with other drawings. The second slot segment 3012 is arranged at one end of the second terminal portion 32 along the axial direction Z towards the first terminal portion 31, and the first slot segment 3011 is arranged on the second terminal portion 32.

[0242] Understandably, the first outer wall 302 is arranged at one end of the second terminal portion 32 along the axial direction Z towards the first terminal portion 31, and the second slot segment 3012 is arranged on the first outer wall 302. Based on this, the step structure 303 formed between the first slot segment 3011 and the second slot segment 3012 is arranged on the second terminal portion 32.

[0243] In this way, the limiting slot 301 can be arranged at a position between the first terminal portion 31 and the second terminal portion 32, that is, the limiting slot 301 can be arranged centrally on the electrode terminal 3 along the axial direction Z, which helps to improve the bonding strength between the electrode terminal 3 and the insulating piece 4, to improve the bonding strength between the insulating piece 4 and the electrode terminal 3, and to reduce the risk of the electrode terminal 3 being pulled out of the shell 2, thereby improving the reliability of the battery monomer 10.

[0244] In some embodiments, please refer to FIG. 24 to FIG. 28, and combine with other drawings. Among them, FIG. 26 is an enlarged view of K in FIG. 25, FIG. 27 is an enlarged sectional view of the electrode terminal 3 in FIG. 26, and FIG. 28 is an enlarged sectional view of the insulating piece 4 in FIG. 26. The at least one limiting slot 301 is a second limiting slot 301b, and the second limiting slot 301b is arranged on the outer peripheral wall of the electrode terminal 3. In the radial direction X of the electrode terminal 3, the cross-sectional area of the second limiting slot 301b perpendicular to the radial direction X is arranged to gradually decrease towards the outer peripheral wall of the electrode terminal 3.

[0245] Understandably, the second limiting slot 301b can pass through the outer peripheral wall of the electrode terminal 3 along the radial direction X. When the electrode terminal 3 includes the first terminal portion 31 and the second terminal portion 32, the outer peripheral wall of the first terminal portion 31 can be provided with the second limiting slot 301b, and the outer peripheral wall of the second terminal portion 32 can also be provided with the second limiting slot 301b.

[0246] Understandably, in the direction of the second limiting slot 301b along the radial direction X towards the outer peripheral wall of the electrode terminal 3, the cross section of the second limiting slot 301b perpendicular to the radial direction X is arranged to be tapered.

[0247] Correspondingly, in the direction of the second limiting slot 301b along the radial direction X towards the outer peripheral wall of the electrode terminal 3, the cross section of the limiting piece 42 perpendicular to the radial direction X is arranged to be tapered.

[0248] In this way, the slot wall of the second limiting slot 301b can achieve radial X limiting on the limiting piece 42. In this way, the first limiting slot 301a and the limiting piece 42 can not only achieve limiting in the axial Z direction, but also achieve limiting in the radial X direction. In this way, the combination strength between the electrode terminal 3 and the insulating piece 4 is improved, the combination strength of the insulating piece 4 and the electrode terminal 3 is improved, and the risk of the electrode terminal 3 being pulled out of the shell 2 is reduced, thereby improving the reliability of the battery monomer 10.

[0249] In some embodiments, please refer to FIGS. 24 and 25, and combine with other drawings. The number of the second limiting slots 301b is multiple, and the multiple second limiting slots 301b are distributed along the circumferential Y direction of the electrode terminal 3.

[0250] Correspondingly, the number of the limiting pieces 42 is multiple, and the multiple limiting pieces 42 are distributed along the circumferential Y direction and correspondingly limited in the multiple second limiting slots 301b. As an example, the multiple limiting pieces 42 and the multiple second limiting slots 301b are one-to-one correspondingly arranged, and each limiting piece 42 is one-to-one correspondingly limited in each second limiting slot 301b.

[0251] In some embodiments, please refer to FIGS. 24 to 28, and combine with other drawings. The circumferential dimension of the second limiting slot 301b is gradually reduced in the direction of the radial X direction towards the outer circumferential wall of the electrode terminal 3.

[0252] Understandably, in the direction of the radial X direction towards the outer circumferential wall of the electrode terminal 3, the circumferential dimension of the second limiting slot 301b is gradually reduced, so that the cross section of the second limiting slot 301b perpendicular to the radial X direction is tapered.

[0253] In this way, at least one side slot wall of the second limiting slot 301b along the circumferential Y direction can achieve radial X limiting on the limiting piece 42. Moreover, the second limiting slot 301b can also achieve limiting on the limiting piece 42 in the axial Z direction and the circumferential Y direction.

[0254] In some embodiments, please refer to FIGS. 29 and 30, and combine with other drawings. FIG. 29 is a cross-sectional view of the electrode terminal, the insulating piece and the connecting piece of the battery monomer provided in some other embodiments of the present application, and FIG. 30 is an enlarged view of L in FIG. 29. The axial dimension of the second limiting slot 301b is gradually reduced in the direction of the radial X direction towards the outer circumferential wall of the electrode terminal 3.

[0255] Understandably, in the direction of the radial X direction towards the outer circumferential wall of the electrode terminal 3, the axial dimension of the second limiting slot 301b is gradually reduced, so that the cross section of the second limiting slot 301b perpendicular to the radial X direction is tapered.

[0256] In this way, at least one side wall of the second limiting groove 301b along the axial direction Z can radially limit the limiting member 42 along the X direction.

[0257] Based on this, in some possible designs, the second limiting groove 301b can be annular to surround the outer periphery of the electrode terminal 3. Correspondingly, the second limiting groove 301b can also be provided in a plurality, and the plurality of second limiting members 42 are distributed along the Y direction. In another possible design, the number of the second limiting groove 301b can be a plurality, and the plurality of second limiting grooves 301b are distributed along the Y direction. Correspondingly, the number of the limiting member 42 can be a plurality, and the plurality of limiting members 42 are distributed along the Y direction and correspondingly limited in the plurality of second limiting grooves 301b.

[0258] 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 peripheral wall of the electrode terminal 3 along the radial direction X, so that the groove wall of the second limiting groove 301b can limit the limiting member 42 along the radial direction X. In this way, it is helpful to improve the bonding strength between the electrode terminal 3 and the insulating member 4, to improve the bonding strength between the insulating member 4 and the electrode terminal 3, 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.

[0259] In some embodiments, please refer to FIGS. 24-28, and combine with other drawings. The number of the second limiting groove 301b is a plurality, and the plurality of second limiting grooves 301b are distributed along the Y direction of the electrode terminal 3, and the two side walls of the second limiting groove 301b opposite along the Y direction are tapered in the radial direction X towards the outer peripheral wall of the electrode terminal 3.

[0260] The two side walls of the second limiting groove 301b opposite along the Y direction are respectively a ninth wall 3021 and a tenth wall 3022, and the limiting member 42 is limited between the ninth wall 3021 and the tenth wall 3022 to be limited in the second limiting groove 301b along the Y direction.

[0261] In the direction of the outer peripheral wall of the electrode terminal 3 along the radial direction X, the ninth wall 3021 and the tenth wall 3022 are tapered, so that the second limiting groove 301b is closed at the outer peripheral wall of the electrode terminal 3, and both the ninth wall 3021 and the tenth wall 3022 can limit the limiting member 42 along the radial direction X, that is, the two side walls of the second limiting groove 301b opposite along the Y direction can limit the limiting member 42 along the radial direction X.

[0262] In some embodiments, please refer to FIGS. 29 and 30, and combine with other drawings. The two side walls of the second limiting groove 301b opposite along the axial direction Z are tapered in the radial direction X towards the outer peripheral wall of the electrode terminal 3.

[0263] The two side walls of the second limiting groove 301b along the axial direction Z are respectively the eleventh groove wall 3023 and the twelfth groove wall 3024, and the limiting member 42 is limited between the eleventh groove wall 3023 and the twelfth groove wall 3024 to be limited in the second limiting groove 301b along the axial direction Z.

[0264] In the direction of the outer peripheral wall of the electrode terminal 3 along the radial direction X of the second limiting groove 301b, the eleventh groove wall 3023 and the twelfth groove wall 3024 are taperedly arranged, so that the second limiting groove 301b is designed to be closed at the outer peripheral wall of the electrode terminal 3, and the eleventh groove wall 3023 and the twelfth groove wall 3024 can both achieve radial X limiting of the limiting member 42, that is, the two side walls of the second limiting groove 301b along the axial direction Z can both achieve radial X limiting of the limiting member 42.

[0265] In this way, in the direction of the outer peripheral wall of the electrode terminal 3 along the radial direction X of the second limiting groove 301b, the second limiting groove 301b can be designed to be closed at the outer peripheral wall of the electrode terminal 3, so that the two side walls of the second limiting groove 301b along the axial direction Z can both achieve radial X limiting of the limiting member 42.

[0266] By adopting the above technical scheme, the limiting strength of the second limiting groove 301b on the limiting member 42 in the radial direction X can be improved, so as to improve the bonding strength between the electrode terminal 3 and the insulating member 4.

[0267] In some embodiments, the fifth size L10 of the second limiting groove 301b = [0.6-0.9]* the sixth size L11 of the second limiting groove 301b. Wherein the fifth size L10 is the axial size of the second limiting groove 301b at one end of the outer peripheral wall of the electrode terminal 3, and the sixth size L11 is the axial size of the second limiting groove 301b away from one end of the outer peripheral wall of the electrode terminal 3 along the radial direction X.

[0268] That is, the fifth size L10 is greater than or equal to 0.6 times the sixth size L11, and the fifth size L10 is less than or equal to 0.9 times the sixth size L11.

[0269] In this way, the limiting member 42 can be effectively limited in the second limiting groove 301b along the radial direction X. Moreover, the closing arrangement of the second limiting groove 301b at the outer peripheral wall of the electrode terminal 3 is not too small, which facilitates the limiting member 42 to enter the second limiting groove 301b.

[0270] In some embodiments, please refer to FIG. 24 to FIG. 28, and combine with other figures. The seventh dimension L5 of the second limiting groove 301b is equal to [0.6-0.9] times of the eighth dimension L6 of the second limiting groove 301b. The seventh dimension L5 is the circumferential dimension of the second limiting groove 301b at one end of the outer peripheral wall of the electrode terminal 3, and the eighth dimension L6 is the circumferential dimension of the second limiting groove 301b away from one end of the outer peripheral wall of the electrode terminal 3 along the radial direction X.

[0271] It can be understood that the seventh dimension L5 is greater than or equal to 0.6 times of the eighth dimension L6, and the seventh dimension L5 is less than or equal to 0.9 times of the eighth dimension L6.

[0272] In this way, the limiting member 42 can be effectively limited in the second limiting groove 301b along the radial direction X. In addition, the second limiting groove 301b is arranged at the outer peripheral wall of the electrode terminal 3, and the second limiting groove 301b is arranged at the outer peripheral wall of the electrode terminal 3. The second limiting groove 301b is arranged at the outer peripheral wall of the electrode terminal 3. The second limiting groove 301b is arranged at the outer peripheral wall of the electrode terminal 3.

[0273] It should be noted here that the one end of the second limiting groove 301b away from the outer peripheral wall of the electrode terminal 3 along the radial direction X is the one end of the second limiting groove 301b away from the outer peripheral wall of the electrode terminal 3 along the radial direction X.

[0274] In some embodiments, please refer to FIG. 6 to FIG. 28, and combine with other figures. The electrode terminal 3 comprises a first terminal part 31 and a second terminal part 32 connected along the axial direction Z, and the radial dimension of the second terminal part 32 is greater than the radial dimension of the first terminal part 31. The insulating body 41 is arranged around the outer periphery of the first terminal part 31 and the second terminal part 32; or the insulating body 41 is arranged around the outer periphery of the first terminal part 31 and not arranged around the outer periphery of the second terminal part 32; or the insulating body 41 is arranged around the outer periphery of the second terminal part 32 and not arranged around the outer periphery of the first terminal part 31. In addition, the second terminal part 32 is arranged on the first wall 221 and connected to the electrode assembly 1. The limiting groove 301 is arranged on at least one of the first terminal part 31 and the second terminal part 32.

[0275] The first terminal part 31 and the second terminal part 32 are two parts of the electrode terminal 3.

[0276] In this way, the second terminal part 32 protrudes from the first terminal part 31 along the radial direction X. In this way, when the insulating body 41 is sleeved on the outer periphery of the first terminal part 31, the insulating body 41 can limit the part of the second terminal part 32 protruding from the first terminal part along the axial direction Z, thereby improving the limitation of the insulating member 4 and the electrode terminal 3 along the axial direction Z, and improving the bonding strength of the electrode terminal 3 and the insulating member 4.

[0277] The axial dimension of the first terminal portion 31 is a ninth dimension L7, and the axial dimension of the second terminal portion 32 is a tenth dimension L8.

[0278] In some embodiments, referring to Figs. 6-21, 24-28, and in combination with other figures. The limiting groove 301 is arranged on the first terminal portion 31, and the axial dimension of the limiting groove 301 = [1 / 3-2 / 3]*the axial dimension of the first terminal portion 31.

[0279] The axial dimension of the limiting groove 301 is an eleventh dimension L9 when the limiting groove 301 is arranged on the first terminal portion 31.

[0280] The eleventh dimension L9 is smaller than the ninth dimension L7, and the eleventh dimension L9 = [1 / 3-2 / 3]*the ninth dimension L7. That is, the eleventh dimension L9 ≥ 1 / 3*the ninth dimension L7, and the eleventh dimension L9 ≤ 2 / 3*the ninth dimension L7.

[0281] In some embodiments, referring to Figs. 22 and 23, and in combination with other figures. The limiting groove 301 is arranged on the second terminal portion 32, and the axial dimension of the limiting groove 301 = [1 / 3-2 / 3]*the axial dimension of the second terminal portion 32.

[0282] The axial dimension of the limiting groove 301 is a twelfth dimension when the limiting groove 301 is arranged on the second terminal portion 32.

[0283] The twelfth dimension is smaller than the tenth dimension L8, and the twelfth dimension = [1 / 3-2 / 3]*the tenth dimension L8. That is, the twelfth dimension ≥ 1 / 3*the tenth dimension L8, and the twelfth dimension ≤ 2 / 3*the tenth dimension L8.

[0284] The twelfth dimension is the fourth dimension L4 when the first outer wall 302 is arranged on one end of the second terminal portion 32 along the axial direction Z towards the first terminal portion 31, as shown in Figs. 22 and 23.

[0285] In some embodiments, part of the limiting groove 301 is arranged on the first terminal portion 31, and part of the limiting groove 301 is arranged on the second terminal portion 32, and the axial dimension of the limiting groove 301 = [1 / 3-2 / 3]*the sum of the axial dimensions of the first terminal portion 31 and the second terminal portion 32.

[0286] It can be understood that the axial dimension of the limiting groove 301 = [1 / 3-2 / 3]*the sum of the ninth dimension L7 and the tenth dimension L8. That is, the axial dimension of the limiting groove 301 ≥ 1 / 3*the sum of the ninth dimension L7 and the tenth dimension L8, and the axial dimension of the limiting groove 301 ≤ 2 / 3*the sum of the ninth dimension L7 and the tenth dimension L8.

[0287] In this way, the limiting groove 301 occupies a relatively appropriate 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, and at the same time, the structural strength and current carrying capacity of the first terminal part 31 can be ensured to a certain extent.

[0288] In some embodiments, referring to FIGS. 1 to 6, and in combination with other drawings. The electrode terminal 3 further comprises a third terminal part 33, which is arranged at one end of the first terminal part 31 away from the second terminal part 32 in the axial direction Z, and the radial dimension of the third terminal part 33 is smaller than that of the first terminal part 31.

[0289] The first terminal part 31, the second terminal part 32 and the third terminal part 33 are three parts of the electrode terminal 3. Among them, the third terminal part 33 is used to connect the conductive part outside the battery monomer 10.

[0290] Among them, the third terminal part 33, the first terminal part 31 and the third terminal part 33 are connected in sequence in the axial direction Z, and the radial dimension gradually increases.

[0291] In some embodiments, referring to FIGS. 1 to 9, and in combination with other drawings. In the radial direction X of the electrode terminal 3, the groove wall of the limiting groove 301 away from the outer peripheral wall of the electrode terminal 3 protrudes or is flush with the third terminal part 33.

[0292] Specifically, in the radial direction X, the groove wall of the limiting groove 301 away from the outer peripheral wall of the electrode terminal 3 protrudes or is flush with the third terminal part 33 away from the outer peripheral wall of the electrode terminal 3.

[0293] Among them, when the limiting groove 301 comprises the first groove segment 3011 and the second groove segment 3012, in some possible designs, as shown in FIG. 9, in the radial direction X, the groove wall of the limiting groove 301 away from the outer peripheral wall of the electrode terminal 3 can be the fourth groove wall 3016 of the second groove segment 3012.

[0294] In some embodiments, in the radial direction X of the electrode terminal 3, the third terminal part 33 protrudes from the groove wall of the limiting groove 301 away from the outer peripheral wall of the electrode terminal 3. In the axial direction Z, the distance between the one end of the limiting groove 301 close to the third terminal part 33 and the one end of the third terminal part 33 away from the first terminal part 31 is ≥1mm.

[0295] Among them, when the limiting groove 301 comprises the first groove segment 3011 and the second groove segment 3012, and the second groove segment 3012 has two opposite groove walls in the axial direction Z, in the axial direction Z, the one end of the limiting groove 301 close to the third terminal part 33 is the fifth groove wall 3017 of the second groove segment 3012.

[0296] The limiting groove 301 includes a first groove section 3011 and a second groove section 3012, and the second groove section 3012 penetrates the first outer wall 302 of the electrode terminal 3 along the axial direction Z. In the axial direction Z, the limiting groove 301 is located at the first outer wall 302 close to one end of the third terminal portion 33. The first outer wall 302 can be located at one end of the first terminal portion 31 close to the third terminal portion 33 along the axial direction Z, or can be located at one end of the second terminal portion 32 close to the first terminal portion 31 along the axial direction Z.

[0297] In the axial direction Z, the distance between the one end of the limiting groove 301 close to the third terminal portion 33 and the one end of the third terminal portion 33 away from the first terminal portion 31 is a first distance, and the first distance is greater than or equal to 1 mm, and can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, etc.

[0298] In this way, when the third terminal portion 33 is welded with the external conductive part, the problem of damaging the limiting groove 301 during welding can be improved, and the welding work of the third terminal portion 33 can be ensured to a certain extent, and the limiting groove 301 can effectively limit the limiting piece 42.

[0299] In some embodiments, in the radial direction X, the third terminal portion 33 protrudes from the groove wall of the limiting groove 301 away from the 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 third terminal portion 33 and the one end of the third terminal portion 33 away from the first terminal portion 31 ranges from 1.5 mm to 3.5 mm.

[0300] 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.

[0301] In this way, in the axial direction Z, the groove wall of the limiting groove 301 close to the third terminal portion 33 and the one end of the third terminal portion 33 away from the first terminal portion 31 have a relatively appropriate distance, which can improve the problem of damaging the limiting groove 301 during welding of the third terminal portion 33, and on the other hand, the limiting groove 301 can occupy a relatively appropriate size proportion of the electrode terminal 3 in the axial direction Z, so that the limiting groove 301 can effectively limit the limiting piece 42.

[0302] In some embodiments, please refer to Figs. 1 to 8, and in combination with other drawings. The battery cell 10 further comprises a connecting member 5, which is sleeved on the outer periphery of the electrode terminal 3. The insulating body 41 is connected to the connecting member 5 and separates the electrode terminal 3 and the connecting member 5. The connecting member 5 is connected to the shell 2. Part of the connecting member 5 is located at one end of the second terminal portion 32 close to the first terminal portion 31 along the axial direction Z.

[0303] The connecting member 5 refers to a component for connecting the insulating member 4 and the shell 2. As an example, the connecting member 5 is a metal structure, which is fixed to the shell 2 by welding.

[0304] Specifically, the connecting member 5 is sleeved on the outer periphery of the electrode terminal 3, and the insulating member 4 is connected between the electrode terminal 3 and the connecting member 5, so that the insulating member 4 is connected to the electrode terminal 3 and the insulating member 4, and separates the electrode terminal 3 and the insulating member 4. In this way, the insulation between the connecting member 5 and the electrode terminal 3 can be achieved, and the insulation between the electrode terminal 3 and the shell 2 can be achieved.

[0305] By locating part of the connecting member 5 at one end of the second terminal portion 32 close to the first terminal portion 31 along the axial direction Z, the connecting member 5 can limit the second terminal portion 32 protruding from the first terminal portion 31 together with the insulating member 4 along the axial direction Z, so that the electrode terminal 3 and the shell 2 can be limited along the axial direction Z, and the bonding strength between the electrode terminal 3 and the shell 2 can be improved to improve the problem of the electrode terminal 3 being pulled out of the shell 2.

[0306] In some embodiments, please refer to Figs. 6 and 11 in combination with other drawings. The insulating body 41 comprises a first insulating portion 411, a second insulating portion 412 and a third insulating portion 413. The first insulating portion 411 is arranged between the first wall 221 and the electrode terminal 3 and surrounds the outer periphery of the electrode terminal 3. The second insulating portion 412 and the third insulating portion 413 are arranged on the inner peripheral wall of the first insulating portion 411 along the axial direction Z, and the limiting member 42 is connected to the second insulating portion 412. Part of the second terminal portion 32 is limited along the axial direction Z between the second insulating portion 412 and the third insulating portion 413.

[0307] Among them, the three parts of the first insulating portion 411, the second insulating portion 412 and the third insulating portion 413 all have insulation performance. As an example, the first insulating portion 411, the second insulating portion 412 and the third insulating portion 413 are all annular structures.

[0308] It can be understood that the second insulating portion 412 and the third insulating portion 413 form a constraint groove 401 along the axial direction Z, and part of the second terminal portion 32 is limited along the axial direction Z in the constraint groove 401.

[0309] It can be understood that the first insulation part 411 is used to make the first wall 221 and the electrode terminal 3 have a certain distance, so as to realize the insulation effect between the first wall 221 and the electrode terminal 3. And the third insulation part 413 is also located between the first wall 221 and the electrode terminal 3, so as to realize the insulation effect between the first wall 221 and the electrode terminal 3.

[0310] In this way, the second terminal part 32 and the insulation body 41 can realize axial Z limiting. In this way, the relative limiting of the electrode terminal 3 and the insulation piece 4 in the axial Z direction can be improved, so that the bonding strength between the electrode terminal 3 and the insulation piece 4 can be improved, so as to reduce the risk of the electrode terminal 3 being pulled out of the shell 2.

[0311] In some embodiments, the insulation piece 4 is injection molded to be connected to the electrode terminal 3.

[0312] It can be understood that the insulation piece 4 is connected to the electrode terminal 3 by injection molding.

[0313] In this way, the limiting piece 42 of the insulation piece 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 insulation piece 4 can be improved, so as to reduce the risk of the electrode terminal 3 being pulled out of the shell 2. In addition, the connection of the insulation piece 4 with the connecting piece 5 and the electrode terminal 3 can be facilitated.

[0314] 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. In the embodiment, the battery monomer 10 is the same as the battery monomer 10 in the above embodiments, and the specific description is referred to the related description of the battery monomer 10 in the above embodiments, which is not repeated here.

[0315] The battery 100 provided by the embodiment of the present application can improve the bonding strength between the insulation piece 4 and the electrode terminal 3, reduce the risk of the electrode terminal 3 being pulled out of the insulation piece 4, that is, 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.

[0316] Please refer to FIG. 1, the power consumption device provided by the embodiment of the present application comprises a battery 100. In the embodiment, the battery 100 is the same as the battery 100 in the above embodiments, and the specific description is referred to the related description of the battery 100 in the above embodiments, which is not repeated here.

[0317] 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.

[0318] As one of the embodiments of the present application, as shown in FIGS. 5-13, the battery cell 10 includes a housing 2, an electrode assembly 1, an electrode terminal 3, an insulating member 4, and a connecting member 5. The electrode assembly 1 is disposed in the housing 2 and connected to the electrode terminal 3. The housing 2 includes a first wall 221, and the electrode terminal 3 is disposed on the first wall 221. The insulating member 4 includes an insulating body 41 and a limiting member 42. At least a portion of the insulating body 41 is disposed between the first wall 221 and the electrode terminal 3 and at least partially surrounds an outer periphery of the electrode terminal 3, and the connecting member 5 is disposed around the outer periphery of the electrode terminal 3. The insulating body 41 is connected between the electrode terminal 3 and the connecting member 5 to separate the connecting member 5 and the electrode terminal 3. The connecting member 5 is connected to the first wall 221. The outer peripheral wall of the electrode terminal 3 is provided with a limiting groove 301, and the limiting groove 301 includes a first groove section 3011 distributed along the radial direction X and a second groove section 3012 communicated with the first groove section 3011, the first groove section 3011 is disposed on the outer peripheral wall of the electrode terminal 3, and the second groove section 3012 protrudes from the first groove section 3011 along the axial direction Z, so that the first groove section 3011 and the second groove section 3012 are relatively bent. The limiting member 42 includes a first limiting portion 421 and a second limiting portion 422, both of which are substantially annular, the first limiting portion 421 is connected to the inner peripheral wall of the insulating body 41, the second limiting portion 422 is connected to the first limiting portion 421 and is bent relative to the first limiting portion 421, and the second limiting portion 422 protrudes from the first limiting portion 421 along the axial direction Z. The first limiting portion 421 is limited in the first groove section 3011 along the axial direction Z, and the second limiting portion 422 is limited in the second groove section 3012 along the axial direction Z and the radial direction X.

[0319] The above merely provides optional embodiments of the present application, but is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of claims of the present application.

Claims

1. A battery cell, wherein, The application relates to a battery shell, comprising: a shell including a first wall; an electrode terminal provided on the first wall and provided with a limiting groove; an insulating piece including an insulating body and a limiting member connected to the insulating body; at least part of the insulating body is arranged between the electrode terminal and the first wall and is arranged around the outer periphery of the electrode terminal; the limiting member cooperates with the limiting groove to form a limit in the axial direction of the electrode terminal.

2. The battery cell of claim 1, wherein, At least one of the limiting grooves is a first limiting groove, the first limiting groove includes a first groove section and a second groove section connected to the first groove section; the limiting member includes a first limiting part and a second limiting part connected to the first limiting part, at least one of the first limiting part and the second limiting part is connected to the insulating body; the first limiting part is limited in the first groove section along the axial direction, and the second limiting part is limited in the second groove section along the radial direction of the electrode terminal.

3. The battery cell of claim 2, wherein, In the axial direction, the second groove section protrudes from at least one side of the first groove section.

4. The battery cell of claim 3, wherein, In the axial direction, the second limiting part protrudes from at least one side of the first limiting part.

5. The battery cell of any one of claims 2-4, wherein, The number of limiting grooves is multiple, and multiple limiting grooves are distributed along the circumferential direction of the electrode terminal; The first limiting part is limited in the first groove section along the circumferential direction, and / or the second limiting part is limited in the second groove section along the circumferential direction.

6. The battery cell of claim 5, wherein, In the circumferential direction, the second groove section protrudes from at least one side of the first groove section.

7. The battery cell of claim 6, wherein, In the circumferential direction, the second limiting part protrudes from at least one side of the first limiting part.

8. The battery cell of any one of claims 2-7, wherein, The first groove section is arranged on the outer peripheral wall of the electrode terminal; and / or the second groove section penetrates the first outer wall of the electrode terminal along the axial direction.

9. The battery cell of claim 8, wherein, The first groove section is arranged on the outer peripheral wall of the electrode terminal, a stepped structure is formed between the first groove section and the second groove section, and the outer peripheral wall of the electrode terminal is arranged on the stepped structure; The single-side dimension of the stepped structure in the radial direction is a first dimension, the single-side dimension of the limiting groove in the radial direction is a second dimension, and the first dimension = [1 / 3, 2 / 3]*the second dimension.

10. The battery cell of claim 8 or 9, wherein, The second groove section penetrates the first outer wall of the electrode terminal along the axial direction, and the third dimension of the electrode terminal = [1 / 3, 2 / 3]*the fourth dimension of the electrode terminal; Wherein, the third dimension is the distance between the groove wall of the first groove section close to the first outer wall and the first outer wall in the axial direction; and the fourth dimension is the distance between the groove wall of the first groove section away from the first outer wall and the first outer wall in the axial direction.

11. The battery cell of claim 8 or 9, wherein, The first groove section is arranged on the outer peripheral wall of the electrode terminal and is distributed along the radial direction with the second groove section; and the second limiting part is also limited in the second groove section along the axial direction.

12. The battery cell of claim 8 or 10, wherein, The second groove section penetrates the first outer wall of the electrode terminal along the axial direction, the first groove section and the second groove section are distributed along the axial direction, and the first limiting part is also limited in the first groove section along the radial direction.

13. The battery cell of any one of claims 2-12, wherein, The electrode terminal includes a first terminal portion and a second terminal portion connected along the axial direction, a radial dimension of the second terminal portion being larger than a radial dimension of the first terminal portion; the insulating body is provided around an outer periphery of at least one of the first terminal portion and the second terminal portion, the second terminal portion being provided on the first wall; the first groove section is provided between an outer peripheral wall of the first terminal portion and one end of the second terminal portion close to the first terminal portion, and the second groove section is provided on the first terminal portion and / or the second terminal portion.

14. The battery cell of any one of claims 2-12, wherein, The electrode terminal includes a first terminal portion and a second terminal portion connected along the axial direction, a radial dimension of the second terminal portion being larger than a radial dimension of the first terminal portion; the insulating body is provided around an outer periphery of at least one of the first terminal portion and the second terminal portion, the second terminal portion being provided on the first wall; the second groove section is provided at one end of the second terminal portion close to the first terminal portion along the axial direction, and the first groove section is provided on the second terminal portion.

15. The battery cell of any one of claims 1-14, wherein, At least one of the limiting grooves is a second limiting groove, the second limiting groove being provided on an outer peripheral wall of the electrode terminal; in the radial direction of the electrode terminal, a cross-sectional area of the second limiting groove perpendicular to the radial direction is gradually reduced toward the outer peripheral wall of the electrode terminal.

16. The battery cell of claim 15, wherein, An axial dimension of the second limiting groove is gradually reduced toward the outer peripheral wall of the electrode terminal along the radial direction; And / or, the number of the second limiting grooves is a plurality, the plurality of second limiting grooves are spaced apart along the circumferential direction of the electrode terminal, and a circumferential dimension of the second limiting groove is gradually reduced toward the outer peripheral wall of the electrode terminal along the radial direction.

17. The battery cell of claim 15, wherein, The second limiting groove is gradually tapered toward the outer peripheral wall of the electrode terminal along the radial direction on the two side groove walls opposite in the axial direction; And / or, the number of the second limiting grooves is a plurality, the plurality of second limiting grooves are spaced apart along the circumferential direction of the electrode terminal, and the two side groove walls of the second limiting groove opposite in the circumferential direction are gradually tapered toward the outer peripheral wall of the electrode terminal along the radial direction.

18. The battery cell of any one of claims 15-17, wherein, A fifth dimension of the second limiting groove = [0.6, 0.9] * a sixth dimension of the second limiting groove; Wherein, the fifth dimension is an axial dimension of the second limiting groove at one end of the outer peripheral wall of the electrode terminal, and the sixth dimension is an axial dimension of the second limiting groove away from one end of the outer peripheral wall of the electrode terminal along the radial direction.

19. The battery cell of any one of claims 15-18, wherein, A seventh dimension of the second limiting groove = [0.6, 0.9] * an eighth dimension of the second limiting groove; Wherein, the seventh dimension is a circumferential dimension of the second limiting groove at one end of the outer peripheral wall of the electrode terminal, and the eighth dimension is a circumferential dimension of the second limiting groove away from one end of the outer peripheral wall of the electrode terminal along the radial direction.

20. The battery cell of any one of claims 1-19, wherein, The electrode terminal includes a first terminal portion and a second terminal portion connected along the axial direction, a radial dimension of the second terminal portion being larger than a radial dimension of the first terminal portion; the insulating body is provided around an outer periphery of at least one of the first terminal portion and the second terminal portion, the second terminal portion being provided on the first wall; The limiting groove is arranged on the first terminal part, and / or the limiting groove is arranged on the second terminal part.

21. The battery cell of claim 20, wherein, The limiting groove is arranged on the first terminal part, and the axial dimension of the limiting groove is equal to [1 / 3, 2 / 3] of the axial dimension of the first terminal part. Alternatively, the limiting groove is arranged on the second terminal part, and the axial dimension of the limiting groove is equal to [1 / 3, 2 / 3] of the axial dimension of the second terminal part. Alternatively, part of the limiting groove is arranged on the first terminal part, and part of the limiting groove is arranged on the second terminal part, and the axial dimension of the limiting groove is equal to [1 / 3, 2 / 3] of the sum of the axial dimensions of the first terminal part and the second terminal part.

22. The battery cell of claim 20 or 21, wherein, The electrode terminal further comprises a third terminal part arranged at one end of the first terminal part away from the second terminal part along the axial direction, and the radial dimension of the third terminal part is smaller than the radial dimension of the first terminal part. In the radial direction of the electrode terminal, the limiting groove protrudes from or is flush with the groove wall away from the peripheral wall of the electrode terminal; or in the radial direction of the electrode terminal, the third terminal part protrudes from the groove wall of the limiting groove away from the peripheral wall of the electrode terminal, and in the axial direction, the distance between the end of the limiting groove close to the third terminal part and the end of the third terminal part away from the first terminal part is greater than or equal to 1 mm.

23. The battery cell of claim 22, wherein, In the radial direction, the third terminal part protrudes from the groove wall of the limiting groove away from the peripheral wall of the electrode terminal, and in the axial direction, the distance between the groove wall close to the third terminal part and the end of the third terminal part away from the first terminal part ranges from 1.5 mm to 3.5 mm.

24. The battery cell of any one of claims 20-23, wherein, The battery cell further comprises a connecting piece arranged on the periphery of the electrode terminal; the insulating body is connected to the connecting piece and separates the electrode terminal and the connecting piece; the connecting piece is connected to the first wall; part of the connecting piece is located at one end of the second terminal part close to the first terminal part along the axial direction.

25. The battery cell of any one of claims 20-24, wherein, The insulating body comprises a first insulating part, a second insulating part and a third insulating part; the first insulating part is arranged between the first wall and the electrode terminal and surrounds the periphery of the electrode terminal; the second insulating part and the third insulating part are arranged on the inner peripheral wall of the first insulating part at intervals along the axial direction; the limiting piece is connected to the second insulating part, and part of the second terminal part is located between the second insulating part and the third insulating part along the axial direction.

26. The battery cell of any one of claims 1-25, wherein, The insulating piece is injection-molded to be connected to the electrode terminal.

27. A battery, wherein, A battery cell according to any one of claims 1-26.

28. An electrical device, comprising: A battery according to claim 27.

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