Battery monomer, battery and electric device

Abstract

The utility model is applicable to the technical field of batteries, and provides a single battery, a battery and a power utilization device, the power utilization device comprises the single battery or the battery, the battery comprises the single battery, and the single battery comprises an electrode assembly, a shell, an end cover and a limiting structure. The shell comprises a shell body and an end structure arranged at the end, in the first direction, of the shell body, at least part of the electrode assembly is arranged in the shell body, a groove is formed in the peripheral wall of the end structure, and the first direction is perpendicular to the circumferential direction of the groove; the end structure comprises a first wall and a second wall which are opposite in the first direction, and a groove is defined by the first wall and the second wall. At least part of the electrode assembly is arranged at one end of the first wall away from the second wall; at least part of the end cover is arranged at one end of the second wall away from the first wall along the first direction; the limiting structure is arranged on the outer side of the shell and is connected with the shell body and the part, away from the first wall in the first direction, of the groove of the end structure. In this way, the risk of fatigue and even breakage of the part, located in the groove, of the shell can be reduced.

Description

Technical Field

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

[0002] In the related art, a battery cell may include a housing, an end cap and an electrode assembly. At least part of the electrode assembly is disposed in the housing, and the end cap is disposed at the end of the housing and encapsulates the electrode assembly together with the housing. The outer peripheral wall of the housing is recessed to form a groove.

[0003] In some cases, the two walls of the groove that are opposite to each other along the first direction are prone to relative movement, so that the parts of the shell at the groove pull each other, thereby causing fatigue cracks or even fractures. That is, there is a risk of fatigue cracks or even fractures in the part of the shell at the groove. Utility Model Content

[0004] In view of the above problems, the embodiments of the present application provide a battery cell, a battery and an electrical device, which can improve the technical problem that the part of the shell at the groove has the risk of fatigue cracks or even breakage.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, including:

[0006] Electrode assembly;

[0007] The shell comprises a shell body and an end structure arranged at an end of the shell body along a first direction, at least part of the electrode assembly is arranged in the shell body, the outer peripheral wall of the end structure is provided with a groove arranged along the circumferential direction, and the first direction is perpendicular to the circumferential direction of the groove; the end structure comprises a first wall and a second wall opposite to each other along the first direction, the first wall and the second wall are arranged to form a groove; at least part of the electrode assembly is arranged at an end of the first wall away from the second wall;

[0008] an end cap, at least partially disposed at an end of the second wall away from the first wall along the first direction;

[0009] The limiting structure is arranged outside the shell body and connects the shell body and the end structure to a portion of the groove away from the first wall along the first direction.

[0010] The battery cell provided in the embodiment of the present application, by arranging a limiting structure on the outside of the shell and connecting it to the shell body, as well as the part of the end structure in the groove away from the first wall along the first direction, the relative position of the part of the end structure in the groove away from the first wall along the first direction and the shell body can be constrained by the limiting structure, and then the relative position of the first wall and the second wall can be constrained by the limiting structure. Under the limiting action of the limiting structure, the relative movement amplitude of the first wall and the second wall can be reduced, so that the mutual pulling problem of the part of the end structure at the groove can be improved, thereby reducing the risk of fatigue cracks or even breakage of the part of the shell at the groove, thereby improving the reliability of the battery cell.

[0011] In some embodiments, the end structure further includes a third wall, which is connected to the second wall and at least partially surrounds at least a portion of the outer periphery of the end cover; and the limiting structure is connected to the third wall.

[0012] By connecting the limiting structure to the third wall, the limiting structure does not need to extend into the groove, so that the connection operation between the limiting structure and the end structure is simpler and easier to implement.

[0013] In some embodiments, the limiting structure is plugged into the third wall along the second direction, and the second direction intersects the first direction.

[0014] By adopting the above technical solution, the third wall can be limited to the limiting structure along the first direction, so that the relative limiting of the third wall and the first wall in the first direction can be achieved, thereby achieving the relative limiting of the first wall and the second wall in the first direction. In this way, the relative movement amplitude of the first wall and the second wall can be reduced, so as to improve the problem of fatigue cracks or even fractures of the part of the shell at the groove, and improve the reliability of the battery cell.

[0015] In some embodiments, the limiting structure abuts against the outer peripheral wall of the third wall.

[0016] Such an arrangement enables the limiting structure to limit the movement of the third wall, and further limit the movement of the second wall relative to the first wall, which helps to improve the problem of fatigue cracks or even fractures of the shell at the groove, and improves the reliability of the battery cell.

[0017] In some embodiments, the third wall comprises:

[0018] A first partition wall connected to the second wall and at least partially surrounding at least a portion of the outer periphery of the end cover;

[0019] A second dividing wall connected to an end of the first dividing wall away from the second wall along the first direction;

[0020] Wherein, the limiting structure is connected to the first partition wall and / or the second partition wall.

[0021] The limiting structure can be connected to at least one of the first partition wall and the second partition wall of the third wall, so that the connection operation between the limiting structure and the third wall is very flexible.

[0022] In some embodiments, the limiting structure is fixed to the second partition wall and is plugged into and matched with the second partition wall along the first direction.

[0023] The plug-in cooperation between the limiting structure and the second partition wall facilitates the positioning of the limiting structure on the second partition wall and facilitates the fixing of the limiting structure and the second partition wall.

[0024] In some embodiments, the limiting structure abuts against an end of the second partition wall away from the second wall along the first direction.

[0025] Such arrangement enables the second partition wall to be limited to the limiting structure along the first direction, that is, the end structure can also be limited to the limiting structure along the first direction. In this way, the limiting structure can limit the movement of the third wall, and further limit the movement of the second wall relative to the first wall.

[0026] In some embodiments, the limiting structure is plugged into the shell body along a second direction, and the second direction intersects the first direction.

[0027] By adopting the above technical solution, the shell body can be limited to the limiting structure along the first direction, so that the shell body and the end structure can be relatively limited in the first direction at the part of the groove away from the first wall along the first direction, thereby realizing the relative limitation of the first wall and the second wall in the first direction. In this way, the relative movement amplitude of the first wall and the second wall can be reduced, so as to improve the problem of fatigue cracks or even fractures of the part of the shell at the groove, and improve the reliability of the battery cell.

[0028] In some embodiments, the end of the shell body away from the end cover is fixed to the limiting structure and is plugged into and matched with the limiting structure along the first direction.

[0029] The plug-in cooperation between the limiting structure and the shell body facilitates the positioning of the limiting structure on the shell body and facilitates the fixation of the limiting structure and the shell body.

[0030] In some embodiments, the limiting structure abuts against the outer peripheral wall of the shell body.

[0031] Such an arrangement can limit the relative movement between the limiting structure and the shell body, and further limit the movement of the second wall relative to the first wall.

[0032] In some embodiments, the limiting structures are continuously arranged along the circumference of the groove; or, there are multiple limiting structures, and the multiple limiting structures are arranged at intervals along the circumference of the groove.

[0033] Such an arrangement makes the arrangement of the limiting structure on the housing very flexible.

[0034] In some embodiments, the limiting structure includes at least one of a metal structure, a ceramic structure, and a plastic structure.

[0035] Such an arrangement enables the limiting structure to effectively constrain the relative movement of the first wall and the second wall, thereby helping to improve the problem of fatigue cracks or even fractures of the shell at the groove, thereby improving the reliability of the battery cell.

[0036] In some embodiments, the limiting structure is heat-melted or welded to the end structure; and / or, the limiting structure is heat-melted or welded to the shell body.

[0037] Such an arrangement makes the fixing operation of the limiting structure on the end structure and the shell body respectively very flexible.

[0038] In some embodiments, the limiting structure includes a limiting member and a first connecting member and a second connecting member sequentially connected to the limiting member along a first direction, the first connecting member is connected to a portion of the end structure at the groove away from the first wall along the first direction, and the second connecting member is connected to the shell body;

[0039] The wall thickness of the limiter is ≤3mm; and / or the radial dimension of the first connecting member in the groove is ≤3mm; and / or the dimension of the first connecting member in the first direction is ≤3mm; the radial dimension of the second connecting member in the groove is ≤3mm; and / or the dimension of the second connecting member in the first direction is ≤3mm.

[0040] By adopting the above technical solution, the size of the limiting structure is reduced, so that the battery cell can maintain a better energy density.

[0041] In some embodiments, along the radial direction of the groove, the wall thickness of the limit member is ≤1mm; and / or, the dimension of the first connecting member in the radial direction of the groove is ≤1mm; and / or, the dimension of the first connecting member in the first direction is ≤1mm; the dimension of the second connecting member in the radial direction of the groove is ≤1mm; and / or, the dimension of the second connecting member in the first direction is ≤1mm.

[0042] By adopting the above technical solution, the size of the limiting structure is reduced, so that the battery cell can maintain a better energy density.

[0043] In a second aspect, an embodiment of the present application provides a battery, including a battery cell.

[0044] The battery provided in the embodiment of the present application, by adopting the battery cell involved above, can reduce the relative movement amplitude of the first wall and the second wall, so that the mutual pulling problem of the part of the end structure at the groove can be improved, thereby reducing the risk of fatigue cracks or even breakage of the part of the shell at the groove, thereby improving the reliability of the battery cell and the reliability of the battery.

[0045] In a third aspect, an embodiment of the present application provides an electrical device, including a battery cell or a battery.

[0046] The electrical device provided in the embodiment of the present application, by adopting the battery cell or battery involved above, can reduce the relative movement amplitude of the first wall and the second wall, so that the problem of mutual pulling of the end structure at the groove can be improved, thereby reducing the risk of fatigue cracks or even breakage of the shell at the groove, thereby improving the reliability of the battery cell and the reliability of the electrical device.

[0047] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0049] Figure 1 A schematic diagram of a vehicle provided for some embodiments of the present application;

[0050] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0051] Figure 3 A three-dimensional schematic diagram of a battery cell provided in some embodiments of the present application;

[0052] Figure 4 for Figure 3 Section view along AA;

[0053] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0054] Figure 6 A three-dimensional schematic diagram of a battery cell provided in some other embodiments of the present application;

[0055] Figure 7 for Figure 6 Sectional view along CC;

[0056] Figure 8 for Figure 7 The enlarged view of point D in the middle;

[0057] Fig. 9 for Figure 7 Enlarged view of point E in the middle;

[0058] Fig.10 A three-dimensional schematic diagram of a battery cell provided in some other embodiments of the present application;

[0059] Fig.11 A three-dimensional schematic diagram of a battery cell provided in some further embodiments of the present application.

[0060] Among them, the reference numerals in the figure are:

[0061] 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-battery cell; 20-box; 201-accommodation space; 21-first part; 22-second part; 11-electrode assembly; 12-shell; 1201-groove; 121-shell body; 1211-second convex column; 122-end structure; 1221-first wall; 1222-second wall; 1223-third wall; 12231-first dividing wall; 12232-second dividing wall; 12233-first convex column; 13-end cover; 14-limiting structure; 14a-first limiting structure; 14b-second limiting structure; 141-limiting member; 1411-first limiting part; 1412-second limiting part; 1413-third limiting part; 142-first connecting member; 143-second connecting member; H-wall thickness of limiting member; H1-wall thickness of first limiting part; H2-wall thickness of second limiting part; H3-wall thickness of third limiting part; T1-radial dimension of the first connecting member along the groove; T2-dimension of the first connecting member along the first direction; T3-radial dimension of the second connecting member along the groove; T4-dimension of the second connecting member along the first direction; Z-first direction; Y-circumferential direction; X-radial direction. DETAILED DESCRIPTION

[0062] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0063] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the 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 specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0065] In the description of the present application, "plurality" means more than two, and unless otherwise clearly and specifically defined, "more than two" includes two. Accordingly, "multiple groups" means more than two groups, including two groups.

[0066] In the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0067] In the description of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0068] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0069] In the related art, a battery cell may include a housing, an end cap and an electrode assembly. At least a portion of the electrode assembly is disposed in the housing, and the end cap is disposed at an end of the housing and encapsulates the electrode assembly together with the housing.

[0070] In some cases, the outer peripheral wall of the shell is recessed to form a groove, so that the inner peripheral wall of the shell protrudes to form a bending piece to limit the electrode assembly and the end cover. It can be understood that the groove wall of the groove constitutes a bending piece that is bent. Specifically, the end cover is arranged at the end of the shell along the first direction, and at least part of the electrode assembly and at least part of the end cover are respectively limited at opposite ends of the bending piece along the first direction.

[0071] During use, the battery cell will experience multiple charge and discharge cycles, causing the internal air pressure of the battery cell to fluctuate, thereby squeezing the bending structure; when the battery cell is in a vibrating condition, the electrode assembly, end cap and other structures will squeeze the bending structure... As a result, the two walls of the groove that are opposite to each other along the first direction are prone to relative movement, causing the parts of the shell at the groove to pull each other, resulting in fatigue cracks or even fractures. That is, the part of the shell at the groove is at risk of fatigue cracks or even fractures.

[0072] Based on the above considerations, an embodiment of the present application provides a battery cell, a battery and an electrical device. By arranging a limiting structure on the outside of the shell and connecting it to the shell body, as well as the portion of the end structure in the groove away from the first wall along the first direction, the relative position of the portion of the end structure in the groove away from the first wall along the first direction and the shell body can be constrained by the limiting structure, and then the relative position of the first wall and the second wall can be constrained by the limiting structure. Under the limiting action of the limiting structure, the relative movement amplitude of the first wall and the second wall can be reduced, so that the mutual pulling problem of the portion of the end structure at the groove can be improved, thereby reducing the risk of fatigue cracks or even breakage in the portion of the shell at the groove, thereby improving the reliability of the battery cell.

[0073] In some embodiments, the battery cells involved in the embodiments of the present application can be used in electrical devices that use battery cells or batteries as power sources, and the batteries involved in the embodiments of the present application can be used in electrical devices that use batteries as power sources.

[0074] The electrical devices involved in the embodiments of the present application may be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, vehicles, ships, spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like. According to the power source, the vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like. According to the drive mode, the vehicle may be a front-wheel drive vehicle, a rear-wheel drive vehicle, or a four-wheel drive vehicle.

[0075] In other embodiments, the battery cells and batteries involved in the embodiments of the present application may also be used in energy storage devices, wherein the energy storage device may be an energy storage container, an energy storage cabinet, and the like.

[0076] The battery involved in the embodiment 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 hybrid connection through a busbar component. Hybrid connection means that multiple battery cells are connected in both series and in parallel.

[0077] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. As an example, the multiple battery cells may be fixed by cable ties or the like to form a battery module. As an example, the multiple battery cells may also be fixed by end plates, side plates, or the like to form a battery module.

[0078] In other embodiments, the battery may be a battery pack, which may include a box and a battery cell. As an example, the battery cell may be directly accommodated in the box. As an example, the battery cell may also be formed into a battery module first and then accommodated in the box.

[0079] The battery cell involved in the embodiments of the present application refers to the smallest unit for storing and outputting electric energy. The battery cell may be a secondary battery or a primary battery. The battery cell may 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 may be cylindrical, flat, rectangular, or in other shapes.

[0080] For ease of description, the embodiments of the present application are described using the electrical device being a vehicle as an example.

[0081] In some embodiments, see Figure 1 , Figure 1 Schematic diagram of a vehicle 1000 provided for some embodiments of the present application. The above-mentioned battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0082] In some embodiments, the battery 100 can be used not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0083] In some embodiments, see Figure 2 , Figure 2 The exploded view of the battery 100 provided in some embodiments of the present application. The battery 100 may include a housing 20 and a plurality of battery cells 10. The housing 20 is a structure having a receiving space 201 inside, and the receiving space 201 of the housing 20 is used to receive the battery cells 10.

[0084] The box body 20 may adopt a variety of structures. In some embodiments, the box body 20 may include a first portion 21 and a second portion 22, which cover each other and define the above-mentioned accommodation space 201. Figure 2 , the first part 21 can be a hollow structure with an opening at one end, the second part 22 is a plate-like structure, and the second part 22 covers the open side of the first part 21, so that the first part 21 and the second part 22 jointly define the above-mentioned accommodation space 201. Alternatively, the first part 21 and the second part 22 can both be hollow structures with an opening at one end, and the open side of the first part 21 covers the open side of the second part 22, so that the first part 21 and the second part 22 jointly define the above-mentioned accommodation space 201. Among them, the box body 20 composed of the first part 21 and the second part 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0085] In some embodiments, see Figure 2 , multiple 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 multiple battery cells 10 is directly accommodated in the above-mentioned accommodation space 201 of the box body 20. In other embodiments, multiple battery cells 10 can also be connected in series, in parallel or in a mixed connection first, and arranged and fixed to form a battery module, and the battery module is accommodated in the above-mentioned accommodation space 201 of the box body 20. In some other embodiments, multiple battery cells 10 can also be connected in series, in parallel or in a mixed connection first, and arranged and fixed to form multiple battery modules, and multiple battery modules are then connected in series, in parallel or in a mixed connection to form a whole, and accommodated in the above-mentioned accommodation space 201 of the box body 20.

[0086] In some embodiments, the box 20 of the battery 100 can be used as part of the chassis structure of the vehicle 1000. For example, part of the box 20 can become at least a part of the chassis of the vehicle 1000, or part of the box 20 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0087] In some embodiments, please refer to Figure 3 and Figure 4 , Figure 3 A three-dimensional schematic diagram of a battery cell 10 provided in some embodiments of the present application, Figure 4 for Figure 3A cross-sectional view along AA. The battery cell 10 may include an electrode assembly 11 .

[0088] The electrode assembly 11 is a component in the battery cell 10 where electrochemical reactions occur. The electrode assembly 11 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 11, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear. The pole ear of the positive electrode sheet is the positive pole ear, and the pole ear of the negative electrode sheet is the negative pole ear. The positive pole ear and the negative pole ear can be located together at one end of the main body or respectively at two opposite ends of the main body.

[0089] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0090] In some cases, the electrode assembly 11 may also be referred to as a bare cell, a wound body, a laminated body, etc.

[0091] In some embodiments, the battery cell 10 may further include an electrolyte, which plays a role in conducting ions between the positive electrode plate and the negative electrode plate. The electrolyte involved in the embodiments of the present application may be liquid, gel or solid.

[0092] In some embodiments, please refer to Figure 3 and Figure 4 The battery cell 10 may further include a shell 12 and an end cap 13 , which are components for jointly defining an internal environment of the battery cell 10 , and the internal environment defined by the shell 12 and the end cap 13 is used to accommodate the electrode assembly 11 and the electrolyte.

[0093] The shell 12 and the end cap 13 may be independent components. Specifically, the shell 12 has an opening, and the end cap 13 is disposed at the opening of the shell 12 to define the internal environment of the battery cell 10 together with the shell 12, and to isolate the internal environment of the battery cell 10 from the external environment. Alternatively, the shell 12 and the end cap 13 may also be an integrated structure. Specifically, a common connection surface may be formed between the end cap 13 and the shell 12 before the electrode assembly 11 is placed in the shell. When the electrode assembly 11 needs to be packaged after the electrode assembly 11 is placed in the shell, the end cap 13 covers the shell 12.

[0094] Among them, Figure 3 and Figure 4 As shown, the number of the end cap 13 can be one, and the end cap 13 is disposed at one end of the housing 12. Alternatively, the number of the end cap 13 can also be two, and the two end caps 13 are disposed at opposite ends of the housing 12 respectively.

[0095] The shell 12 may be cylindrical, square, or other shapes, which may be determined according to the specific shape and size of the electrode assembly 11. In addition, the shell 12 and the end cap 13 may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like.

[0096] Please also read Figures 3 to 9 , and combined with other drawings. Among them, Figure 5 for Figure 4 The enlarged view of point B in the middle. Figure 6 The three-dimensional structure diagram of the battery cell 10 provided in some other embodiments of the present application is as follows: Figure 7 for Figure 6 Cross-sectional view along CC, Figure 8 for Figure 7 The enlarged view of D in the middle. Fig. 9 for Figure 8 Enlarged view at E in the figure. The battery cell 10 provided in the embodiment of the present application includes an electrode assembly 11, a shell 12, an end cover 13 and a limiting structure 14. The shell 12 includes a shell body 121 and an end structure 122, and the end structure 122 is arranged at the end of the shell body 121 along the first direction Z. At least part of the electrode assembly 11 is arranged in the shell body 121. The outer peripheral wall of the end structure 122 is provided with a groove 1201, and the groove 1201 is arranged along the circumferential direction Y. The first direction Z is perpendicular to the circumferential direction Y of the groove 1201. The end structure 122 includes a first wall 1221 and a second wall 1222, and the first wall 1221 and the second wall 1222 are arranged opposite to each other in the first direction Z, and the first wall 1221 and the second wall 1222 are arranged to form the groove 1201. At least part of the electrode assembly 11 is arranged at one end of the first wall 1221 away from the second wall 1222. At least part of the end cap 13 is disposed at one end of the second wall 1222 away from the first wall 1221 along the first direction Z. The limiting structure 14 is disposed outside the shell 12 and connects the shell body 121 and the end structure 122 at a portion of the groove 1201 away from the first wall 1221 along the first direction Z.

[0097] The shell body 121 refers to the main part of the shell 12, and the shell body 121 can be used to accommodate the electrode assembly 11. The end structure 122 refers to the structure of the end of the shell 12 along the first direction Z, which is a partial structure of the shell 12. The end structure 122 is arranged at the end of the shell 12 along the first direction Z.

[0098] Please continue reading Figures 3 to 9 As shown in the figure, and in combination with other figures. The end cap 13 is arranged at the end of the shell 12, specifically, the end cap 13 is arranged at the end structure 122. Based on this, the shell body 121, the end structure 122 and the end cap 13 are used to jointly define the internal space of the battery cell 10, so that the shell body 121, the end structure 122 and the end cap 13 jointly encapsulate the electrode assembly 11.

[0099] Among them, Figures 3 to 9 As shown, when the number of the end caps 13 is one, the number of the end structure 122 is one, and the end structure 122 is disposed at one end of the shell body 121 along the first direction Z, and the end cap 13 is also disposed at one end of the shell body 12 along the first direction Z, specifically, the end cap 13 is disposed at the end structure 122. When the number of the end caps 13 is two, the number of the end structures 122 is two, and the two end structures 122 are respectively disposed at the opposite ends of the shell body 121 along the first direction Z, and the two end caps 13 are also respectively disposed at the opposite ends of the shell body 12 along the first direction Z, specifically, the two end caps 13 are respectively disposed at the two end structures 122 in a one-to-one correspondence.

[0100] The outer peripheral wall of the end structure 122 is provided with a groove 1201, so that the groove 1201 surrounds the outer peripheral wall of the end structure 122. The surrounding direction of the groove 1201 around the outer peripheral wall of the end structure 122 is the setting direction of the groove 1201, that is, the circumferential direction Y of the groove 1201. Specifically, the outer peripheral wall of the end structure 122 around the first direction Z is provided with a groove 1201, and the groove 1201 surrounds the outer peripheral wall of the shell 12, specifically, the groove 1201 surrounds the outer peripheral wall of the shell 12.

[0101] The first direction Z refers to the arrangement direction of the shell body 121 and the end structure 122. In some cases, the first direction Z may be a height direction or a length direction of the battery cell 10.

[0102] As an example, see Figures 3 to 9 The battery cell 10 is generally cylindrical. A groove 1201 is provided on the outer peripheral wall of the end structure 122 around the first direction Z. The groove 1201 is generally annular and surrounds the outer peripheral wall of the end structure 122 around the first direction Z. The circumferential direction defined by the circle where the groove 1201 is located is the circumferential direction Y of the groove 1201, and the radial direction X defined by the circle where the groove 1201 is located is the radial direction X of the groove 1201.

[0103] Please continue reading Figures 3 to 9 , the groove wall of the groove 1201 constitutes a first wall 1221 and a second wall 1222, and the first wall 1221 and the second wall 1222 are arranged opposite to each other along the first direction Z. The first wall 1221 and the second wall 1222 are two parts of the end structure 122, respectively, and are solid walls. One end of the first wall 1221 is connected to one end of the second wall 1222, and the other end of the first wall 1221 is connected to the shell body 121. The first wall 1221 and the second wall 1222 are arranged to be bent relative to each other, and the second wall 1222 and the shell body 121 are arranged at intervals along the first direction Z.

[0104] It can be understood that the end structure 122 includes a first wall 1221 and a second wall 1222. Specifically, the end structure 122 can be divided into two parts arranged in sequence along the first direction Z. Among them, one part of the end structure 122 is connected to the shell body 121, and the part of the end structure 122 includes the first wall 1221; the other part of the end structure 122 is spaced apart from the shell body 121 along the first direction Z, and the part of the end structure 122 includes the second wall 1222. The two parts of the end structure 122 are connected to each other and are bent relative to each other, so that the two parts of the end structure 122 are enclosed to form a groove 1201. In other words, the part of the end structure 122 away from the second wall 1222 in the groove 1201 along the first direction Z includes the first wall 1221 and is connected to the shell body 121; the part of the end structure 122 away from the first wall 1221 in the groove 1201 along the first direction Z includes the second wall 1222 and is spaced apart from the shell body 121 along the first direction Z.

[0105] At least a portion of the electrode assembly 11 is located at one end of the first wall 1221 away from the second wall 1222 along the first direction Z, and at least a portion of the end cover 13 is located at one end of the second wall 1222 away from the first wall 1221 along the first direction Z, so that at least a portion of the electrode assembly 11 and at least a portion of the end cover 13 are respectively limited at opposite ends of the groove 1201 along the first direction Z.

[0106] The limiting structure 14 refers to a structure for limiting the relative movement between the first wall 1221 and the second wall 1222. The limiting structure 14 is connected to the shell body 121, and is also connected to the portion of the end structure 122 at the groove 1201 away from the first wall 1221 along the first direction Z. The portion of the end structure 122 at the groove 1201 away from the first wall 1221 along the first direction Z may include only the second wall 1222, or may include the second wall 1222 and the third wall 1223 mentioned below.

[0107] The battery cell 10 provided in the embodiment of the present application connects the limiting structure 14 to the shell body 121 and the part of the end structure 122 in the groove 1201 along the first direction Z away from the first wall 1221, so that the relative position of the part of the end structure 122 in the groove 1201 along the first direction Z away from the first wall 1221 and the shell body 121 can be constrained by the limiting structure 14, and then the relative position of the first wall 1221 and the second wall 1222 can be constrained by the limiting structure 14, so that under the limiting action of the limiting structure 14, the relative movement amplitude of the first wall 1221 and the second wall 1222 can be reduced, so that the mutual pulling problem of the part of the end structure 122 at the groove 1201 can be improved, thereby reducing the risk of fatigue cracks or even breakage of the part of the shell 12 at the groove 1201, thereby improving the reliability of the battery cell 10.

[0108] Specifically, the limiting structure 14 is connected to the shell body 121, so that the limiting structure 14 and the shell body 121 can be relatively limited in the first direction Z, that is, the shell body 121 can be limited to the limiting structure 14 along the first direction Z. The limiting structure 14 is connected to the portion of the end structure 122 in the groove 1201 away from the first wall 1221 along the first direction Z, so that the portion of the end structure 122 in the groove 1201 away from the first wall 1221 along the first direction Z and the limiting structure 14 can be limited in the first direction Z, that is, the portion of the end structure 122 in the groove 1201 away from the first wall 1221 along the first direction Z can be limited to the limiting structure 14 along the first direction Z. Furthermore, the relative limitation of the limiting structure 14 and the second wall 1222 in the first direction Z can be achieved, that is, the second wall 1222 can be limited to the limiting structure 14 along the first direction Z. Based on this, the first wall 1221 and the second wall 1222 can be limited by the limiting structure 14 along the first direction Z respectively, so that the first wall 1221 and the second wall 1222 can be relatively limited in the first direction Z through the limiting structure 14, so that the relative movement amplitude of the first wall 1221 and the second wall 1222 can be reduced.

[0109] In some embodiments, please refer to Figures 3 to 9 , and in combination with other drawings. The limiting structure 14 includes a limiting member 141, a first connecting member 142 and a second connecting member 143, and the first connecting member 142 and the second connecting member 143 are sequentially connected to the limiting member 141 along the first direction Z. The first connecting member 142 is connected to the end structure 122 at a portion of the groove 1201 away from the first wall 1221 along the first direction Z, and the second connecting member 143 is connected to the shell body 121.

[0110] The limiting member 141, the first connecting member 142 and the second connecting member 143 are three parts of the limiting structure 14. The first connecting member 142 refers to the part of the limiting structure 14 used to connect with the end structure 122, and the second connecting member 143 refers to the part of the limiting structure 14 used to connect with the shell body 121. The limiting member 141 is used to constrain the relative position of the first connecting member 142 and the second connecting member 143 in the first direction Z, so as to limit the relative position of the end structure 122 in the groove 1201 along the first direction Z away from the first wall 1221 and the first wall 1221 in the first direction Z.

[0111] In some embodiments, please refer to Figure 5 and Figure 8 , and in combination with other drawings. The end structure 122 further includes a third wall 1223 , which is connected to the second wall 1222 and at least partially surrounds at least a portion of the outer periphery of the end cover 13 . The limiting structure 14 is connected to the third wall 1223 .

[0112] The third wall 1223 refers to a solid wall of the end structure 122 . The portion of the end structure 122 away from the first wall 1221 along the first direction Z of the groove 1201 may include a second wall 1222 and a third wall 1223 .

[0113] Specifically, the third wall 1223 and the shell body 121 are spaced apart from each other along the first direction Z, and the second wall 1222 is connected to the third wall 1223 .

[0114] By providing the third wall 1223 , the end cover 13 can be provided on the third wall 1223 , so that the end cover 13 can be provided on the shell 12 .

[0115] By connecting the limiting structure 14 to the third wall 1223, the limiting structure 14 connects the end structure 122 to the portion of the groove 1201 away from the first wall 1221 along the first direction Z, so that the relative limitation of the first wall 1221 and the second wall 1222 can be achieved, thereby reducing the relative movement amplitude of the first wall 1221 and the second wall 1222, so as to improve the problem of mutual pulling of the end structure 122 at the groove 1201, and further improve the risk of fatigue cracks or even fracture of the end structure 122 at the groove 1201, thereby improving the reliability of the battery cell 10.

[0116] In some other embodiments, the limiting structure 14 can be connected to the second wall 1222 to achieve connection with the portion of the end structure 122 in the groove 1201 away from the first wall 1221 along the first direction Z. Based on this, a portion of the limiting structure 14 can be inserted into the groove 1201 and connected to the second wall 1222.

[0117] It should be noted that the limiting structure 14 is connected to the third wall 1223. Compared with the solution in which the connecting portion of the limiting structure 14 is located in the portion of the groove 1201 away from the first wall 1221 along the first direction Z, the limiting structure 14 does not need to extend into the groove 1201, thereby making the connection operation between the limiting structure 14 and the end structure 122 simpler and easier to implement.

[0118] In some embodiments, please refer to Figure 5 and Figure 8 The limiting structure 14 is plugged and matched with the third wall 1223 along the second direction, and the second direction intersects with the first direction Z.

[0119] Specifically, the first connecting member 142 of the limiting structure 14 is plug-fitted with the third wall 1223 along the second direction.

[0120] Part of the limiting structure 14 may be inserted into the third wall 1223 along the second direction, and part of the third wall 1223 may also be inserted into the limiting structure 14 along the second direction.

[0121] The intersection of the first direction Z and the second direction means that the first direction Z and the second direction can form an angle greater than 0° and less than 180°, that is, the first direction Z and the second direction are not parallel. The first direction Z and the second direction can be perpendicular to each other or not perpendicular to each other. The first direction Z and the second direction can be directions intersecting on the same plane or on planes that are not aligned with each other, and the projection of the second direction on the plane where the first direction Z is located can intersect with the first direction Z.

[0122] As an example, the first direction Z is perpendicular to the second direction. Specifically, part of the limiting structure 14 is plugged into the outer peripheral wall of the third wall 1223 around the first direction Z along the second direction.

[0123] As an example, the groove 1201 is substantially annular, the first direction Z and the second direction are perpendicular, and the second direction is the radial direction X of the groove 1201 .

[0124] As an example, the first connecting member 142 of the limiting structure 14 is plugged into the outer peripheral wall of the third wall 1223 around the first direction Z.

[0125] By adopting the above technical solution, the third wall 1223 can be limited to the limiting structure 14 along the first direction Z, so that the relative limiting of the third wall 1223 and the first wall 1221 in the first direction Z can be achieved, thereby achieving the relative limiting of the first wall 1221 and the second wall 1222 in the first direction Z. In this way, the relative movement amplitude of the first wall 1221 and the second wall 1222 can be reduced, so as to improve the problem of mutual pulling of the parts of the shell 12 at the groove 1201, thereby improving the problem of fatigue cracks or even fractures of the parts of the shell 12 at the groove 1201, and improving the reliability of the battery cell 10.

[0126] In some embodiments, please refer to Figure 5 and Figure 8 , and in combination with other drawings. The limiting structure 14 abuts against the outer peripheral wall of the third wall 1223 .

[0127] Specifically, the limiting member 141 of the limiting structure 14 abuts against the outer peripheral wall of the third wall 1223 around the first direction Z.

[0128] With such arrangement, the limiting structure 14 can limit the movement of the third wall 1223, and further limit the movement of the second wall 1222 relative to the first wall 1221. In this way, the amplitude of the relative movement of the first wall 1221 and the second wall 1222 can be reduced, so as to improve the problem of the parts of the housing 12 at the groove 1201 pulling each other, thereby improving the problem of fatigue cracks or even fractures of the parts of the housing 12 at the groove 1201, and improving the reliability of the battery cell 10.

[0129] In some embodiments, please refer to Figure 5 and Figure 8 , and in combination with other drawings. The third wall 1223 includes a first partition wall 12231 and a second partition wall 12232. The first partition wall 12231 is disposed on the second wall 1222, and at least partially surrounds at least a portion of the outer periphery of the end cover 13. The second partition wall 12232 is disposed at one end of the first partition wall 12231 away from the second wall 1222 along the first direction Z. Among them, the limiting structure 14 is connected to the first partition wall 12231; or, as Figure 5 and Figure 8 As shown, the limiting structure 14 is connected to the second partition wall 12232 ; alternatively, the limiting structure 14 is connected to the first partition wall 12231 and the second partition wall 12232 .

[0130] The first dividing wall 12231 and the second dividing wall 12232 are two parts of the second wall 1222, respectively, and are solid walls. The first dividing wall 12231 and the second dividing wall 12232 are bent relative to each other.

[0131] The limiting structure 14 can be connected to at least one of the first partition wall 12231 and the second partition wall 12232 of the third wall 1223 , so that the connection operation between the limiting structure 14 and the third wall 1223 is very flexible.

[0132] It should be additionally explained that when the first connecting member 142 of the limiting structure 14 is fixed to the third wall 1223 , the first connecting member 142 may be fixed to at least one of the first partition wall 12231 and the second partition wall 12232 .

[0133] When the first connecting member 142 of the limiting structure 14 is plugged into and matched with the third wall 1223 along the second direction, the first connecting member 142 is plugged into and matched with the outer peripheral wall of the third wall 1223 around the first direction Z.

[0134] In some embodiments, please refer to Figure 5 and Figure 8 The limiting structure 14 is fixed to the second partition wall 12232 and is plugged and matched with the second partition wall 12232 along the first direction Z.

[0135] Specifically, the first connecting member 142 of the limiting structure 14 is fixed to the second partition wall 12232 by welding, snap-fitting or the like.

[0136] The first connecting member 142 is plugged into and matched with the second dividing wall 12232 along the first direction Z. As an example, Figure 5 and Figure 8 As shown, the first connecting member 142 is inserted into the second partition wall 12232 along the first direction Z. Specifically, the second partition wall 12232 is provided with a first convex column 12233 at one end away from the first wall 1221 along the first direction Z, and the first connecting member 142 is inserted into the first convex column 12233 along the first direction Z.

[0137] By fixing the limiting structure 14 to the second partition wall 12232, the limiting structure 14 and the end structure 122 can be relatively limited in the first direction Z at the part of the groove 1201 away from the first wall 1221 along the first direction Z, so as to achieve the relative limitation of the first wall 1221 and the second wall 1222 in the first direction Z, and can reduce the amplitude of the relative movement of the first wall 1221 and the second wall 1222, so as to improve the problem of fatigue cracks or even fracture of the part of the shell 12 at the groove 1201, thereby improving the reliability of the battery cell 10.

[0138] The limiting structure 14 and the end structure 122 can also achieve limiting in the second direction by plugging and matching with the second dividing wall 12232 along the first direction Z. In this way, the connection strength between the limiting structure 14 and the second dividing wall 12232 can be improved, which is conducive to improving the relative limiting strength of the limiting structure 14 on the first wall 1221 and the second wall 1222, so as to improve the problem of fatigue cracks or even fractures of the part of the housing 12 at the groove 1201.

[0139] In addition, the positioning structure 14 and the second partition wall 12232 are plugged together to facilitate positioning of the positioning structure 14 on the second partition wall 12232 and fixation of the positioning structure 14 and the second partition wall 12232 .

[0140] In some embodiments, please refer to Figure 5 and Figure 8 , and in combination with other drawings. The limiting structure 14 abuts against one end of the second dividing wall 12232 away from the second wall 1222 along the first direction Z.

[0141] With such arrangement, the second partition wall 12232 can be limited to the limiting structure 14 along the first direction Z, that is, the end structure 122 can also be limited to the limiting structure 14 along the first direction Z. In this way, the limiting structure 14 can limit the movement of the third wall 1223, and further limit the movement of the second wall 1222 relative to the first wall 1221. In this way, the amplitude of the relative movement of the first wall 1221 and the second wall 1222 can be reduced, so as to improve the problem of mutual pulling of the parts of the shell 12 at the groove 1201, thereby improving the problem of fatigue cracks or even fractures of the parts of the shell 12 at the groove 1201, and improving the reliability of the battery cell 10.

[0142] In some embodiments, please refer to Figure 5 and Fig. 9 The limiting structure 14 is plugged and matched with the shell body 121 along the second direction, and the second direction intersects with the first direction Z.

[0143] Specifically, the second connecting member 143 of the limiting structure 14 is plug-fitted with the shell body 121 along the second direction.

[0144] Part of the limiting structure 14 can be inserted into the shell body 121 along the second direction, and part of the shell body 121 can also be inserted into the limiting structure 14 along the second direction.

[0145] The intersection of the first direction Z and the second direction means that the first direction Z and the second direction can form an angle greater than 0° and less than 180°, that is, the first direction Z and the second direction are not parallel. The first direction Z and the second direction can be perpendicular to each other or not perpendicular to each other. The first direction Z and the second direction can be directions intersecting on the same plane or on planes that are not aligned with each other, and the projection of the second direction on the plane where the first direction Z is located can intersect with the first direction Z.

[0146] As an example, the first direction Z is perpendicular to the second direction. Specifically, part of the limiting structure 14 is plugged into the outer peripheral wall of the shell body 121 around the first direction Z along the second direction.

[0147] As an example, the groove 1201 is substantially annular, the first direction Z and the second direction are perpendicular, and the second direction is the radial direction X of the groove 1201 .

[0148] As an example, the second connecting member 143 of the limiting structure 14 is plugged into the outer peripheral wall of the shell body 121 around the first direction Z.

[0149] By adopting the above technical solution, the shell body 121 can be limited to the limiting structure 14 along the first direction Z, so that the shell body 121 and the end structure 122 can be relatively limited in the first direction Z at the part of the groove 1201 away from the first wall 1221 along the first direction Z, thereby achieving the relative limitation of the first wall 1221 and the second wall 1222 in the first direction Z. In this way, the relative movement amplitude of the first wall 1221 and the second wall 1222 can be reduced, so as to improve the problem of mutual pulling of the parts of the shell 12 at the groove 1201, thereby improving the problem of fatigue cracks or even fractures of the parts of the shell 12 at the groove 1201, and improving the reliability of the battery cell 10.

[0150] In some embodiments, see Fig. 9 The end of the shell body 121 away from the end cover 13 is fixed to the limiting structure 14 and plugged with the limiting structure 14 along the first direction Z.

[0151] Specifically, the second connecting member 143 of the limiting structure 14 is fixed to the end of the shell body 121 away from the end cover 13 along the first direction Z by welding, snap-fitting or the like.

[0152] The second connecting member 143 is plug-fitted with the end of the shell body 121 away from the end cover 13 along the first direction Z. As an example, Fig. 9 As shown, the second connector 143 is plugged into the end of the shell body 121 away from the end cover 13 along the first direction Z. Specifically, the end of the shell body 121 away from the end cover 13 along the first direction Z is provided with a second boss 1211, and the second connector 143 is plugged into the second boss 1211 along the first direction Z.

[0153] By fixing the limiting structure 14 to the end of the shell body 121 away from the end cover 13 along the first direction Z, the limiting structure 14 and the shell body 121 can be relatively limited in the first direction Z, so as to achieve the relative limitation of the first wall 1221 and the second wall 1222 in the first direction Z, and the amplitude of the relative movement of the first wall 1221 and the second wall 1222 can be reduced, so as to improve the problem of fatigue cracks or even fracture of the part of the shell 12 at the groove 1201, thereby improving the reliability of the battery cell 10.

[0154] The limiting structure 14 and the shell body 121 can also be limited in the second direction by plugging and matching the limiting structure 14 along the first direction Z with the end of the shell body 121 away from the end cover 13 along the first direction Z. In this way, the connection strength between the limiting structure 14 and the shell body 121 can be improved, which is conducive to improving the strength of the limiting structure 14 to achieve relative limiting of the first wall 1221 and the second wall 1222, so as to improve the problem of fatigue cracks or even fractures of the part of the shell 12 at the groove 1201.

[0155] In addition, the positioning structure 14 and the shell body 121 are plugged together to facilitate positioning of the positioning structure 14 on the shell body 121 and fixation of the positioning structure 14 and the shell body 121 .

[0156] In some embodiments, please refer to Figure 5 , Figure 8 and Fig. 9 , and in combination with other drawings. The limiting structure 14 abuts against the outer peripheral wall of the shell body 121 .

[0157] Specifically, the limiting member 141 of the limiting structure 14 abuts against the outer peripheral wall of the shell body 121 around the first direction Z.

[0158] Such a configuration can limit the relative movement between the limiting structure 14 and the shell body 121, and further limit the movement of the second wall 1222 relative to the first wall 1221. In this way, the amplitude of the relative movement between the first wall 1221 and the second wall 1222 can be reduced, so as to improve the problem of the parts of the shell 12 at the groove 1201 pulling each other, thereby improving the problem of fatigue cracks or even fractures of the parts of the shell 12 at the groove 1201, and improving the reliability of the battery cell 10.

[0159] In some embodiments, please refer to Figure 3 and Figure 6 , and in combination with other drawings. The limiting structures 14 are continuously arranged along the circumferential direction Y of the groove 1201 .

[0160] Specifically, Figure 3 and Figure 6 As shown, the limiting structure 14 is generally annular in shape and is extended along the circumferential direction Y of the groove 1201 .

[0161] Alternatively, in other embodiments, please refer to Fig.10 and Fig.11 , and combined with other drawings. Among them, Fig.10 The three-dimensional structure diagram of the battery cell 10 provided in some embodiments of the present application is shown in FIG. Fig.11 The three-dimensional structure diagram of the battery cell 10 provided in some other embodiments of the present application. There are multiple limiting structures 14 , and the multiple limiting structures 14 are arranged at intervals along the circumferential direction Y of the groove 1201 .

[0162] Such an arrangement makes the arrangement of the limiting structure 14 on the housing 12 very flexible.

[0163] In some embodiments, the limiting structure 14 includes at least one of a metal structure, a ceramic structure, and a plastic structure.

[0164] It can be understood that the limiting structure 14 can be a metal structure, a ceramic structure, a plastic structure, etc., which can limit the relative movement between the first wall 1221 and the second wall 1222.

[0165] It is understandable that when the number of the limiting structures 14 is one, the limiting structure 14 may be a metal structure, a ceramic structure or a plastic structure. When the number of the limiting structures 14 is multiple, each limiting structure 14 may be a metal structure, a ceramic structure or a plastic structure, and the materials of the multiple limiting structures 14 may be the same or different. For example, the number of the limiting structures 14 is multiple, wherein a part of the limiting structures 14 is a metal structure, another part of the limiting structures 14 is a ceramic structure, and another part of the limiting structures 14 is a plastic structure.

[0166] Such a configuration enables the limiting structure 14 to effectively constrain the relative movement of the first wall 1221 and the second wall 1222 , thereby helping to improve the problem of fatigue cracks or even breakage of the shell 12 at the groove 1201 , thereby improving the reliability of the battery cell 10 .

[0167] In some embodiments, the limiting structure 14 is heat-melted or welded to the end structure 122 .

[0168] It can be understood that the limiting structure 14 can be fixed to the end structure 122 by heat melting or welding.

[0169] Specifically, the first connecting member 142 can be fixed to the portion of the end structure 122 in the groove 1201 away from the first wall 1221 along the first direction Z by heat melting or welding.

[0170] In some embodiments, the limiting structure 14 is heat-melted or welded to the shell body 121 .

[0171] It can be understood that the limiting structure 14 can be fixed to the shell body 121 by heat melting or welding.

[0172] Specifically, the second connecting member 143 can be fixed to the shell body 121 by heat melting or welding.

[0173] Such an arrangement makes it very flexible to fix the limiting structure 14 on the end structure 122 and the shell body 121 respectively.

[0174] In some embodiments, please refer to Figure 5 , Figure 8 and Fig. 9, and in combination with other drawings. The limiting structure 14 includes a limiting member 141, a first connecting member 142 and a second connecting member 143, and the first connecting member 142 and the second connecting member 143 are sequentially connected to the limiting member 141 along the first direction Z. The first connecting member 142 connects the end structure 122 to the portion of the groove 1201 away from the first wall 1221 along the first direction Z, and the second connecting member 143 is connected to the shell body 121.

[0175] The battery cell 10 may include at least one of the following solutions:

[0176] First, the wall thickness of the limiting member 141 is H, where H≤3 mm.

[0177] Among them, H can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0178] Among some possible designs, such as Figure 5 As shown, and combined with other drawings. The limiting structure 14 is a first limiting structure 14a. The limiting member 141 of the first limiting structure 14a includes a first limiting portion 1411 and a second limiting portion 1412 sequentially arranged along the first direction Z, the first limiting portion 1411 is arranged at one end of the third wall 1223 away from the first wall 1221 along the first direction Z, the second limiting portion 1412 is arranged on the outer peripheral wall of the third wall 1223 around the first direction Z, the first connecting member 142 is arranged on the first limiting portion 1411, and the second connecting member 143 is arranged on the second limiting portion 1412. Among them, in the first direction Z, the wall thickness of the first limiting portion 1411 is H1. In the radial direction X of the groove 1201, the wall thickness of the second limiting portion 1412 is H2.

[0179] Based on this, the wall thickness H of the stopper 141 may include the wall thickness H1 of the first stopper 1411 and the wall thickness H2 of the second stopper 1412. It can be understood that H1≤3mm, specifically 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc. H2≤3mm, specifically 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0180] Among some possible designs, such as Figure 8 and Fig. 9As shown, and combined with other drawings. The limiting structure 14 is a second limiting structure 14b. The limiting member 141 of the second limiting structure 14b includes a first limiting portion 1411, a second limiting portion 1412 and a third limiting portion 1413 which are sequentially arranged along the first direction Z. The first limiting portion 1411 is arranged at one end of the third wall 1223 away from the first wall 1221 along the first direction Z, the second limiting portion 1412 is arranged at the outer peripheral wall of the third wall 1223 around the first direction Z, and the third limiting portion 1413 is arranged at one end of the shell body 121 away from the end cover 13 along the first direction Z. The first connecting member 142 is arranged at the first limiting portion 1411, and the second connecting member 143 is arranged at the third limiting portion 1413. Among them, in the first direction Z, the wall thickness of the first limiting portion 1411 is H1. In the radial direction X of the groove 1201, the wall thickness of the second limiting portion 1412 is H2. In the first direction Z, the wall thickness of the third limiting portion 1413 is H3.

[0181] Based on this, the wall thickness of the limiting member 141 may include the wall thickness H1 of the first limiting portion 1411, the wall thickness H2 of the second limiting portion 1412, and the wall thickness H3 of the third limiting portion 1413. It can be understood that H1≤3mm, specifically 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc. H2≤3mm, specifically 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc. H3≤3mm, specifically 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0182] Second, in the radial direction X of the groove 1201 , the size of the first connecting member 142 is T1 , and T1 ≤ 3 mm.

[0183] Among them, T1 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0184] Third, in the first direction Z, the size of the first connecting member 142 is T2, and T2≤3 mm.

[0185] Among them, T2 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0186] Fourth, in the radial direction X of the groove 1201 , the size of the second connecting member 143 is T3, and T3≤3 mm.

[0187] Among them, T3 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0188] Fifth, in the first direction Z, the size of the second connecting member 143 is T4, and T4≤3 mm.

[0189] Among them, T4 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0190] By adopting the above technical solution, the size of the limiting structure 14 is reduced, so that the battery cell 10 can maintain a better energy density.

[0191] In some embodiments, the wall thickness H of the limiting member 141 is ≤ 1 mm.

[0192] The wall thickness H of the limiting member 141 may be 0.01 mm, 0.02 mm, 0.05 mm, 0.06 mm, 0.08 mm, 0.1 mm, etc.

[0193] Specifically, H1≤1mm, and specifically can be 0.01mm, 0.02mm, 0.05mm, 0.06mm, 0.08mm, 0.1mm, etc. H2≤1mm, and specifically can be 0.01mm, 0.02mm, 0.05mm, 0.06mm, 0.08mm, 0.1mm, etc. H3≤1mm, and specifically can be 0.01mm, 0.02mm, 0.05mm, 0.06mm, 0.08mm, 0.1mm, etc.

[0194] In some embodiments, in the radial direction X of the groove 1201 , a dimension T1 of the first connecting member 142 is ≤1 mm.

[0195] Among them, T1 can be 0.01mm, 0.02mm, 0.05mm, 0.06mm, 0.08mm, 0.1mm, etc.

[0196] In some embodiments, in the first direction Z, a dimension T2 of the first connecting member 142 is ≤1 mm.

[0197] Among them, T2 can be 0.01mm, 0.02mm, 0.05mm, 0.06mm, 0.08mm, 0.1mm, etc.

[0198] In some embodiments, in the radial direction X of the groove 1201 , a dimension T3 of the second connecting member 143 is ≤1 mm.

[0199] Among them, T3 can be 0.01mm, 0.02mm, 0.05mm, 0.06mm, 0.08mm, 0.1mm, etc.

[0200] In some embodiments, in the first direction Z, a dimension T4 of the second connecting member 143 is ≤1 mm.

[0201] Among them, T4 can be 0.01mm, 0.02mm, 0.05mm, 0.06mm, 0.08mm, 0.1mm, etc.

[0202] By adopting the above technical solution, the size of the limiting structure 14 is reduced, so that the battery cell 10 can maintain a better energy density.

[0203] See also Figure 2 , and in combination with other drawings. The battery 100 provided in the embodiment of the present application includes a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 in the previous embodiment, which will not be repeated here.

[0204] The battery 100 provided in the embodiment of the present application, by adopting the battery cell 10 involved above, can reduce the relative movement amplitude of the first wall 1221 and the second wall 1222, so that the mutual pulling problem of the end structure 122 at the groove 1201 can be improved, thereby reducing the risk of fatigue cracks or even breakage of the shell 12 at the groove 1201, thereby improving the reliability of the battery cell 10 and the reliability of the battery 100.

[0205] See also Figure 1 The electric device provided in the embodiment of the present application includes a battery cell 10 or a battery 100. The battery cell 10 and the battery 100 in the present embodiment are the same as the battery cell 10 and the battery 100 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 and the battery 100 in the previous embodiment, which will not be repeated here.

[0206] The electrical device provided in the embodiment of the present application, by adopting the battery cell 10 or battery 100 involved above, can reduce the relative movement amplitude of the first wall 1221 and the second wall 1222, so that the mutual pulling problem of the end structure 122 at the groove 1201 can be improved, thereby reducing the risk of fatigue cracks or even breakage of the shell 12 at the groove 1201, thereby improving the reliability of the battery cell 10 and the reliability of the electrical device.

[0207] As one of the embodiments of this application, Figures 3 to 5As shown, the battery cell 10 includes an electrode assembly 11, a shell 12, an end cover 13 and a limiting structure 14. The shell 12 includes a shell body 121 and an end structure 122. The end structure 122 is arranged at the end of the shell body 121 along the first direction Z, and at least part of the electrode assembly 11 is located in the shell body 121. The end structure 122 is provided with a groove 1201 around the outer peripheral wall of the first direction Z. The groove 1201 is provided with a first wall 1221 and a second wall 1222 opposite to each other along the first direction Z. The end structure 122 also includes a third wall 1223. One end of the first wall 1221 is connected to one end of the second wall 1222, the other end of the first wall 1221 is connected to the shell body 121, and the third wall 1223 is connected to the other end of the second wall 1222. The first wall 1221 and the second wall 1222 are arranged to be bent relative to each other. In the first direction Z, the third wall 1223 and the shell body 121 are arranged at intervals, and the groove 1201 is located between the shell body 121 and the third wall 1223. The limiting structure 14 includes a limiting member 141, a first connecting member 142 and a second connecting member 143, and the first connecting member 142 and the second connecting member 143 are sequentially arranged on the limiting member 141 along the first direction Z. The first connecting member 142 is plugged into an end of the third wall 1223 away from the first wall 1221 along the first direction Z, and the first connecting member 142 and the third wall 1223 are fixed. The second connecting member 143 is plugged into the outer peripheral wall of the shell body 121 along the radial direction X of the groove 1201, and the second connecting member 143 and the shell body 121 are fixed.

[0208] As another embodiment of the present application, Figures 6 to 9As shown, the battery cell 10 includes an electrode assembly 11, a shell 12, an end cover 13 and a limiting structure 14. The shell 12 includes a shell body 121 and an end structure 122. The end structure 122 is arranged at the end of the shell body 121 along the first direction Z, and at least part of the electrode assembly 11 is located in the shell body 121. The end structure 122 is provided with a groove 1201 around the outer peripheral wall of the first direction Z. The groove 1201 is provided with a first wall 1221 and a second wall 1222 opposite to each other along the first direction Z. The end structure 122 also includes a third wall 1223. One end of the first wall 1221 is connected to one end of the second wall 1222, the other end of the first wall 1221 is connected to the shell body 121, and the third wall 1223 is connected to the other end of the second wall 1222. The first wall 1221 and the second wall 1222 are arranged to be bent relative to each other. In the first direction Z, the third wall 1223 and the shell body 121 are spaced apart, and the groove 1201 is located between the shell body 121 and the third wall 1223. The limiting structure 14 includes a limiting member 141, a first connecting member 142, and a second connecting member 143, and the first connecting member 142 and the second connecting member 143 are sequentially connected to the limiting member 141 along the first direction Z. The first connecting member 142 is plugged into an end of the third wall 1223 away from the first wall 1221 along the first direction Z along the first direction Z, and the first connecting member 142 and the third wall 1223 are fixed. The second connecting member 143 is plugged into an end of the shell body 121 away from the end cover 13 along the first direction Z along the first direction Z, and the second connecting member 143 and the shell body 121 are fixed.

[0209] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: Electrode assembly; A shell, comprising a shell body and an end structure arranged at an end of the shell body along a first direction, wherein at least a portion of the electrode assembly is arranged in the shell body, and an outer peripheral wall of the end structure is provided with a groove arranged along a circumferential direction, wherein the first direction is perpendicular to the circumferential direction of the groove; the end structure comprises a first wall and a second wall opposite to each other along the first direction, wherein the first wall and the second wall surround and form the groove; and at least a portion of the electrode assembly is arranged at an end of the first wall away from the second wall; an end cap, at least partially disposed at an end of the second wall away from the first wall along the first direction; The limiting structure is arranged outside the shell and connects the shell body and the portion of the end structure away from the first wall along the first direction.

2. The battery cell according to claim 1, characterized in that: The end structure further includes a third wall, which is connected to the second wall and at least partially surrounds at least a portion of the outer circumference of the end cover; the limiting structure is connected to the third wall.

3. The battery cell according to claim 2, characterized in that: The limiting structure is plugged into and matched with the third wall along a second direction, and the second direction intersects with the first direction.

4. The battery cell according to claim 2 or 3, characterized in that: The limiting structure abuts against the outer peripheral wall of the third wall.

5. The battery cell according to any one of claims 2 to 4, characterized in that: The third wall comprises: A first dividing wall connected to the second wall and at least partially surrounding at least a portion of the outer periphery of the end cover; a second dividing wall connected to an end of the first dividing wall away from the second wall along the first direction; Wherein, the limiting structure is connected to the first partition wall and / or the second partition wall.

6. The battery cell according to claim 5, characterized in that: The limiting structure is fixed to the second dividing wall and is plug-fitted with the second dividing wall along the first direction.

7. The battery cell according to claim 5 or 6, characterized in that: The limiting structure abuts against an end of the second dividing wall away from the second wall along the first direction.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The limiting structure is plugged into and matched with the shell body along a second direction, and the second direction intersects with the first direction.

9. The battery cell according to claim 8, characterized in that: The end of the shell body away from the end cover is fixed to the limiting structure and plug-fitted with the limiting structure along the first direction.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The limiting structure abuts against the outer peripheral wall of the shell body.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The limiting structures are continuously arranged along the circumference of the groove; or, there are multiple limiting structures, and the multiple limiting structures are arranged at intervals along the circumference of the groove.

12. The battery cell according to any one of claims 1 to 11, characterized in that: The limiting structure includes at least one of a metal structure, a ceramic structure and a plastic structure.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The limiting structure is hot-melted or welded to the end structure; and / or the limiting structure is hot-melted or welded to the shell body.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The limiting structure includes a limiting member and a first connecting member and a second connecting member sequentially connected to the limiting member along the first direction, the first connecting member being connected to the end structure at a portion of the groove away from the first wall along the first direction, and the second connecting member being connected to the shell body; The wall thickness of the limit member is ≤3mm; and / or the dimension of the first connecting member in the radial direction of the groove is ≤3mm; and / or the dimension of the first connecting member in the first direction is ≤3mm; the dimension of the second connecting member in the radial direction of the groove is ≤3mm; and / or the dimension of the second connecting member in the first direction is ≤3mm.

15. The battery cell according to claim 14, characterized in that: Along the radial direction of the groove, the wall thickness of the limit member is ≤1mm; and / or the dimension of the first connecting member in the radial direction of the groove is ≤1mm; and / or the dimension of the first connecting member in the first direction is ≤1mm; the dimension of the second connecting member in the radial direction of the groove is ≤1mm; and / or the dimension of the second connecting member in the first direction is ≤1mm.

16. A battery, characterized in that: Comprising a battery cell according to any one of claims 1-15.

17. An electrical device, characterized in that: Comprising a battery cell according to any one of claims 1 to 15; or comprising a battery according to claim 16.

Images