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 supporting structure. At least part of the electrode assembly is arranged in the shell, and a groove is formed in the peripheral wall of the shell in the circumferential direction. The end cover is arranged at the end part of the shell along the first direction, and at least part of the end cover and at least part of the electrode assembly are respectively arranged on two opposite sides of the groove along the first direction; the first direction is perpendicular to the circumferential direction of the groove. At least part of the supporting structure is arranged in the groove. Thus, the amplitude of relative movement of the two opposite walls of the groove in the first direction can be reduced, so that the problem that parts of the shell at the groove are mutually pulled is solved, the problem that the part of the shell at the groove generates fatigue cracks and even fractures is solved, the risk that the part of the shell at the groove generates fatigue cracks and even fractures is reduced, and the service life of the shell is prolonged. The battery monomer reliability is improved.

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 shell, an end cap and an electrode assembly. At least part of the electrode assembly is disposed in the shell, and the end cap is disposed at the end of the shell, and together with the shell, the electrode assembly is encapsulated. 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 portion to limit the electrode assembly and the end cap. Specifically, the end cap is disposed 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 cap are respectively limited to opposite sides of the bending portion along the first direction.

[0003] In some cases, the two walls of the bent portion that are opposite to each other along the first direction are prone to relative movement, so that the connection between the two walls is pulled against each other, resulting in fatigue cracks or even fractures. That is, the part of the housing at the groove is at risk of fatigue cracks or even fractures. 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] A shell, wherein at least part of the electrode assembly is disposed in the shell, and an outer peripheral wall of the shell is provided with a groove disposed in a circumferential direction;

[0008] An end cap is arranged at an end of the shell along a first direction, and at least a portion of the end cap and at least a portion of the electrode assembly are respectively arranged on opposite sides of the groove along the first direction; the first direction is perpendicular to the circumference of the groove;

[0009] The supporting structure is at least partially disposed in the groove.

[0010] In the battery cell provided by the embodiment of the present application, at least part of the support structure is disposed in the groove, so that the support structure can achieve a certain support effect on the two walls of the groove that are opposite to each other along the first direction. In this way, the amplitude of the relative movement of the two walls of the groove that are opposite to each other along the first direction can be reduced, so as to improve the problem of the two walls of the groove that are opposite to each other along the first direction pulling each other, that is, to improve the problem of the part of the shell at the groove pulling each other, and then to improve the problem of fatigue cracks or even fractures of the part of the shell at the groove, so as to reduce the risk of fatigue cracks or even fractures of the part of the shell at the groove, and improve the reliability of the battery cell.

[0011] In some embodiments, the support structure includes a support member, at least a portion of the support member being located within the recess;

[0012] When there are multiple support members, the multiple support members are distributed in sequence along the radial direction of the groove.

[0013] By adopting the above technical solution, the support structure includes at least one support member. When there are multiple support members, the support stability and reliability of the support structure for the two opposite walls of the groove along the first direction can be improved.

[0014] In some embodiments, in the first direction, the groove wall of the groove constitutes a first wall and a second wall opposite to each other, at least a portion of the electrode assembly is disposed on a side of the first wall away from the second wall, and at least a portion of the end cap is disposed on a side of the second wall away from the first wall;

[0015] At least one support member includes a first support member, at least a portion of which is located in the groove and abuts against the first wall and the second wall; and / or, at least one support member includes a second support member, at least a portion of which is located in the groove and connected to the first wall, and the second support member abuts against the second wall; and / or, at least one support member includes a third support member, at least a portion of which is located in the groove and connected to the second wall, and the third support member abuts against the first wall; and / or, at least one support member includes a fourth support member, at least a portion of which is located in the groove and connected to the first wall and the second wall.

[0016] Such an arrangement makes the arrangement of the support member very flexible.

[0017] In some embodiments, the second support member is integrally formed with the first wall;

[0018] And / or, the third support member is integrally formed with the second wall.

[0019] This makes the processing operation of the battery cell very simple.

[0020] In some embodiments, in the first direction, a side of the first wall away from the second wall is recessed, so that a side of the first wall protrudes toward the second wall to form a second support member;

[0021] And / or, in the first direction, a side of the second wall away from the first wall is recessed, so that the second wall protrudes toward a side of the first wall to form a third support member.

[0022] In this way, the support member is integrally arranged on the shell, so that after the shell forms a groove, the support member is located in the groove and achieves a supporting function, which can improve the problem of fatigue cracks or even fractures of the shell at the groove, making the processing operation of the battery cell very simple. In addition, the recessed arrangement of at least one of the first wall and the second wall also helps to maintain a better energy density of the battery cell.

[0023] In some embodiments, the support members are disposed continuously or discontinuously in the circumferential direction of the groove.

[0024] By adopting the above technical solution, the arrangement of the support member is very flexible.

[0025] In some embodiments, the support member includes at least one of a metal member, a ceramic member, and a rubber member.

[0026] Such an arrangement enables the support member to support and limit the two walls of the groove that are opposite to each other along the first direction, so as to reduce the amplitude of relative movement of the two walls of the groove that are opposite to each other along the first direction, thereby improving the problem of fatigue cracks or even fractures of the shell part at the groove and improving the reliability of the battery cell.

[0027] In some embodiments, the support structure satisfies the following relationship:

[0028] 0.2≤the difference between the outer diameter and the inner diameter of the supporting structure along the radial direction of the groove / the difference between the outer diameter and the inner diameter of the groove along the radial direction≤1.

[0029] Such an arrangement allows the support structure to occupy a larger radial space of the groove, so that the support structure can stably and reliably support the two walls of the groove that are opposite to each other along the first direction, thereby effectively reducing the amplitude of relative movement of the two walls of the groove that are opposite to each other along the first direction, thereby improving the problem of fatigue cracks or even fractures of the shell at the groove, and improving the reliability of the battery cell.

[0030] In some embodiments, 0.8≦the difference between the outer diameter and the inner diameter of the support structure along the radial direction of the groove / the difference between the outer diameter and the inner diameter of the groove along the radial direction≦1.

[0031] Such an arrangement enables the support structure to occupy a larger radial space of the groove, so that the support structure can stably and reliably support the two opposite walls of the groove along the first direction.

[0032] In some embodiments, the support structure satisfies the following relationship:

[0033] 0.2≤φ1 / φ2≤1;

[0034] In the radial direction of the groove, the inner diameter of the groove is φ1, and the inner diameter of the supporting structure is φ2.

[0035] Such arrangement enables the support structure to be close to the groove wall of the groove in the radial direction in a good manner in the radial direction. In this way, on the one hand, the problem of fatigue cracks or even fractures occurring at the connection of the two walls of the groove that are opposite to each other in the first direction can be improved. On the other hand, when the support members of the support structure are continuously arranged in the circumferential direction, the support members are not easy to be separated from the groove in the radial direction, so that the support and limiting function can be stably realized for the two walls of the groove that are opposite to each other in the first direction.

[0036] In some embodiments, 0.8≤φ1 / φ2≤1.

[0037] Such an arrangement enables the support structure to be better radially close to the groove wall of the groove in the radial direction.

[0038] In some embodiments, the housing satisfies the following relationship:

[0039] 0.5≤φ1 / φ3<1;

[0040] In the radial direction of the groove, the inner diameter of the groove is φ1, and the outer diameter of the shell is φ3.

[0041] Such arrangement enables the groove to have a larger inner diameter, and can avoid components such as adapters, poles, pole ears, explosion-proof valves, etc. In this way, the supporting structure also has a correspondingly larger inner diameter, which helps to make the battery cell have a better energy density.

[0042] In some embodiments, 0.8≤φ1 / φ3<1.

[0043] Such arrangement enables the groove to have a larger inner diameter, and can avoid components such as adapters, poles, pole ears, explosion-proof valves, etc. In this way, the supporting structure also has a correspondingly larger inner diameter, which helps to make the battery cell have a better energy density.

[0044] In some embodiments, the support structure satisfies the following relationship:

[0045] 0.5<φ4 / φ3≤1;

[0046] In the radial direction of the groove, the outer diameter of the shell is φ3, and the outer diameter of the supporting structure is φ4.

[0047] Such an arrangement enables the support structure to be completely located in the groove and to be fully used to achieve the support function without protruding out of the groove to cause waste, thus enabling the battery cell to have a better energy density.

[0048] In some embodiments, the support structure satisfies the following relationship:

[0049] 0<T1 / T2<10;

[0050] T1 is the dimension of the supporting structure along the first direction, and T2 is the wall thickness of the shell.

[0051] Such an arrangement allows the thickness of the support structure to be maintained within a reasonable range, thereby maintaining a better energy density of the battery cell while being able to support the two walls of the groove that are opposite to each other along the first direction.

[0052] In a second aspect, an embodiment of the present application provides a battery, including a battery cell.

[0053] The battery provided in the embodiment of the present application, by adopting the battery cell involved above, can reduce the risk of fatigue cracks or even breakage of the portion of the shell at the groove, improve the reliability of the battery cell, and further improve the reliability of the battery.

[0054] In a third aspect, an embodiment of the present application provides an electrical device, including a battery cell or a battery.

[0055] The electrical device provided in the embodiment of the present application, by adopting the battery cell or battery involved above, can reduce the risk of fatigue cracks or even breakage of the part of the shell at the groove, improve the reliability of the battery cell, and further improve the reliability of the electrical device.

[0056] 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

[0057] 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 creative labor.

[0058] Figure 1 A schematic diagram of a vehicle provided for some embodiments of the present application;

[0059] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0060] Figure 3 A three-dimensional schematic diagram of a battery cell provided in some embodiments of the present application;

[0061] Figure 4 for Figure 3 Section view along AA;

[0062] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0063] Figure 6 for Figure 4 Enlarged view of point C in the middle;

[0064] Figure 7 An exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0065] Figure 8 A cross-sectional view of a battery cell provided for some other embodiments of the present application;

[0066] Fig. 9 for Figure 8 The enlarged view of point D in the middle;

[0067] Fig.10 A cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0068] Fig.11 for Fig.10 Enlarged view of point E in the middle;

[0069] Fig.12 A schematic diagram of a support structure provided for some embodiments of the present application;

[0070] Fig.13 for Fig.12 A side view of the support structure is provided.

[0071] Among them, the reference numerals in the figure are:

[0072] 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-battery cell; 20-housing; 201-accommodation space; 21-first part; 22-second part; 11-electrode assembly; 12-shell; 1201-groove; 121-bending portion; 1211-first wall; 1212-second wall; 13-end cover; 14-support structure; 141-support member; 141a-first support member; 141b-second support member; 141c-third support member; φ1-inner diameter of the groove; φ2-inner diameter of the support structure; φ3-outer diameter of the shell; φ4-outer diameter of the support structure; T1-dimension of the support structure along the first direction; T2-wall thickness of the shell; Z-first direction; Y-circumferential direction; X-radial direction; L-first axis. DETAILED DESCRIPTION

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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 bent portion to limit the electrode assembly and the end cap. Specifically, the end cap 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 cap are respectively limited to opposite sides of the bent portion along the first direction. The arrangement of the groove enables the bent portion to have two walls arranged oppositely along the first direction, one end of which is connected to each other and is arranged to be bent relative to each other.

[0082] During the use of the battery cell, it will experience multiple charge and discharge cycles, causing the internal air pressure of the battery cell to fluctuate, thereby squeezing the bent portion; when the battery cell is in a vibrating condition, the electrode assembly, end cap and other structures will squeeze the bent portion... As a result, the two walls of the bent portion that are opposite to each other along the first direction are prone to relative movement, causing the connection between the two walls to pull each other, resulting in fatigue cracks or even fractures. That is, there is a risk of fatigue cracks or even fractures in the bent portion. That is, there is a risk of fatigue cracks or even fractures in the portion of the shell at the groove.

[0083] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery, and an electrical device, wherein at least a portion of the support structure is disposed in the groove, so that the support structure can achieve a certain support effect on the two walls of the groove that are opposite to each other along the first direction. In this way, the amplitude of the relative movement of the two walls of the groove that are opposite to each other along the first direction can be reduced, so as to improve the problem of the two walls of the groove that are opposite to each other along the first direction pulling each other, that is, to improve the problem of the parts of the shell at the groove pulling each other, and then to improve the problem of fatigue cracks or even fractures of the parts of the shell at the groove, so as to reduce the risk of fatigue cracks or even fractures of the parts of the shell at the groove, and improve the reliability of the battery cell.

[0084] 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.

[0085] 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.

[0086] 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 devices may be energy storage containers, energy storage cabinets, and the like.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] For ease of description, the embodiments of the present application are described using an electrical device as a vehicle as an example.

[0092] In some embodiments, see Figure 1 , Figure 1Schematic 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.

[0093] 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 .

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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 3 A cross-sectional view along AA. The battery cell 10 may include an electrode assembly 11 .

[0099] 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.

[0100] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0101] In some cases, the electrode assembly 11 may also be referred to as a bare cell, a wound body, a laminated body, etc.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] Please also read Figures 4 to 7 , and combined with other drawings. Figure 5 for Figure 4 The enlarged view of point B in the middle. Figure 6 for Figure 4 The enlarged image of point C in the middle. Figure 7 Schematic diagram of an exploded view of a battery cell 10 provided in some embodiments of the present application. The battery cell 10 provided in the embodiment of the present application includes an electrode assembly 11, a shell 12, an end cap 13 and a support structure 14. At least part of the electrode assembly 11 is disposed in the shell 12, and the outer peripheral wall of the shell 12 is provided with a groove 1201 arranged along the circumferential direction Y. The end cap 13 is disposed at the end of the shell 12 along the first direction Z, and at least part of the end cap 13 and at least part of the electrode assembly 11 are respectively disposed on opposite sides of the groove 1201 along the first direction Z. The first direction Z is perpendicular to the circumferential direction Y of the groove 1201. At least part of the support structure 14 is disposed in the groove 1201.

[0108] like Figure 7As shown in the figure, and in combination with other drawings. The outer peripheral wall of the housing 12 is provided with a groove 1201, which is roughly annular and surrounds the outer peripheral wall of the housing 12. 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. In the following, if there is no special explanation, the circumferential direction Y refers to the circumferential direction Y of the groove 1201, and the radial direction X refers to the radial direction X of the groove 1201.

[0109] Specifically, the battery cell 10 has a first axis L, and the outer peripheral wall of the housing 12 around the first axis L is provided with a groove 1201 , that is, the circumference Y of the groove 1201 is arranged around the first axis L, and the first axis L is parallel to the first direction Z.

[0110] In some cases, the first direction Z may be a length direction or a height direction of the battery cell 10 .

[0111] The number of the end caps 13 can be one or two. When the number of the end caps 13 is one, the end cap 13 is disposed at one end of the housing 12 along the first direction Z. When the number of the end caps 13 is two, the two end caps 13 are disposed at opposite ends of the housing 12 along the first direction Z, respectively.

[0112] like Figures 4 to 7 As shown, and in combination with other drawings. Part of the shell 12 is recessed inward to form a bending portion 121, so that the bending portion 121 defines the above-mentioned groove 1201. Specifically, the groove wall of the groove 1201 constitutes the bending portion 121. At least part of the electrode assembly 11 is limited to one side of the bending portion 121 along the first direction Z, and at least part of the end cover 13 is limited to the other side of the bending portion 121 along the first direction Z, so that the bending portion 121 limits the electrode assembly 11 and the end cover 13, so that at least part of the electrode assembly 11 and at least part of the end cover 13 are respectively arranged on opposite sides of the groove 1201 along the first direction Z.

[0113] The support structure 14 refers to a structure with a supporting function. At least part of the support structure 14 is disposed in the groove 1201, so that at least one of the two opposite walls of the groove 1201 along the first direction Z can abut against the support structure 14 along the first direction Z, thereby achieving position limiting through the support structure 14. In this way, the amplitude of the relative movement of the two opposite walls of the groove 1201 along the first direction Z can be reduced.

[0114] The battery cell 10 provided in the embodiment of the present application, by disposing at least part of the support structure 14 in the groove 1201, enables the support structure 14 to achieve a certain support effect on the two opposite walls of the groove 1201 along the first direction Z. In this way, the amplitude of the relative movement of the two opposite walls of the groove 1201 along the first direction Z can be reduced, so as to improve the problem of the two opposite walls of the groove 1201 pulling each other along the first direction Z, that is, to improve the problem of the part of the shell 12 at the groove 1201 pulling each other, and further improve the problem of fatigue cracks or even fractures of the part of the shell 12 at the groove 1201, so as to reduce the risk of fatigue cracks or even fractures of the part of the shell 12 at the groove 1201, and improve the reliability of the battery cell 10.

[0115] In some embodiments, the support structure 14 includes a support member 141, and at least a portion of the support member 141 is located in the groove 1201. When there are multiple support members 141, the multiple support members 141 are distributed in sequence along the radial direction X of the groove 1201.

[0116] The support member 141 refers to a component of the support structure 14 for achieving a supporting function. It can be understood that the support structure 14 includes at least one support member 141.

[0117] When there are multiple support members 141 , the multiple support members 141 are disposed continuously or at intervals along the radial direction X of the groove 1201 .

[0118] By adopting the above technical solution, the support structure 14 includes at least one support member 141. When there are multiple support members 141, the multiple support members 141 are sequentially distributed along the radial direction X of the groove 1201, which can improve the support stability and reliability of the support structure 14 on the two opposite walls of the groove 1201 along the first direction Z, thereby improving the problem of mutual pulling of the parts of the shell 12 at the groove 1201, thereby reducing the risk of fatigue cracks or even fractures in the parts of the shell 12 at the groove 1201, and improving the reliability of the battery cell 10.

[0119] In some embodiments, please refer to Figures 4 to 11 , and combined with other drawings. Among them, Figure 8 The cross-sectional view of the battery cell 10 provided in some other embodiments of the present application is as follows: Fig. 9 for Figure 8 The enlarged view of point D in the middle. Fig.10 The cross-sectional view of the battery cell 10 provided in some embodiments of the present application is as follows: Fig.11 for Fig.10In the first direction Z, the groove wall of the groove 1201 forms a first wall 1211 and a second wall 1212 opposite to each other, at least a portion of the electrode assembly 11 is disposed on a side of the first wall 1211 away from the second wall 1212, and at least a portion of the end cap 13 is disposed on a side of the second wall 1212 away from the first wall 1211.

[0120] The first wall 1211 and the second wall 1212 are two solid walls of the groove 1201 that are opposite to each other along the first direction Z. It can be understood that the bending portion 121 includes the first wall 1211 and the second wall 1212, which are arranged opposite to each other along the first direction Z, and the first wall 1211 and the second wall 1212 enclose the groove 1201. In addition, in the radial direction X of the groove 1201, an inward end of the first wall 1211 is connected to an inward end of the second wall 1212, and the first wall 1211 and the second wall 1212 are arranged to be bent relative to each other.

[0121] At least a portion of the electrode assembly 11 is disposed on a side of the first wall 1211 away from the second wall 1212 along the first direction Z, and at least a portion of the end cover 13 is disposed on a side of the second wall 1212 away from the first wall 1211 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 to opposite sides of the bending portion 121 along the first direction Z.

[0122] In some embodiments, please refer to Figures 4 to 7 At least one support member 141 includes a first support member 141 a , at least a portion of the first support member 141 a is located in the groove 1201 and abuts against the first wall 1211 and the second wall 1212 .

[0123] It can be understood that at least one support member 141 is the first support member 141a. That is, when there is one support member 141, the support member 141 is the first support member 141a; when there are multiple support members 141, at least one support member 141 is the first support member 141a.

[0124] At least a portion of the first support member 141a is located in the groove 1201, and one side of the first support member 141a along the first direction Z abuts against the first wall 1211, and the other side of the first support member 141a along the first direction Z abuts against the second wall 1212, so that the first support member 141a abuts against the first wall 1211 and the second wall 1212.

[0125] By adopting the above technical solution, on the one hand, the first support member 141a is made to abut against the first wall 1211 and the second wall 1212 to support the first wall 1211 and the second wall 1212. In this way, the amplitude of the relative movement of the first wall 1211 and the second wall 1212 can be reduced to improve the problem of mutual pulling of the parts of the shell 12 at the groove 1201, and further improve the problem of fatigue cracks or even fractures of the parts of the shell 12 at the groove 1201, thereby improving the reliability of the battery cell 10. On the other hand, when setting the first support member 141a, the first support member 141a can be directly placed in the groove 1201, so that the first support member 141a can support the first wall 1211 and the second wall 1212, which is convenient for setting the first support member 141a on the shell 12.

[0126] In other embodiments, please refer to Figure 8 and Fig. 9 At least one support member 141 includes a second support member 141 b , at least a portion of the second support member 141 b is located in the groove 1201 and connected to the first wall 1211 , and the second support member 141 b abuts against the second wall 1212 .

[0127] It can be understood that at least one support member 141 is the second support member 141b. That is, when there is one support member 141, the support member 141 is the second support member 141b; when there are multiple support members 141, at least one support member 141 is the second support member 141b.

[0128] The second support member 141b may be integrally connected to the first wall 1211. The second support member 141b may also be separately connected to the first wall 1211 to achieve the fixing of the second support member 141b on the first wall 1211.

[0129] The second support member 141b is connected to the first wall 1211 and abuts against the second wall 1212, so that the second support member 141b can support the second wall 1212 to limit the relative movement of the first wall 1211 and the second wall 1212, thereby improving the problem of mutual pulling of the shell 12 at the groove 1201, and further improving the problem of fatigue cracks or even fracture of the shell 12 at the groove 1201, thereby improving the reliability of the battery cell 10.

[0130] In some other embodiments, please refer to Fig.10 and Fig.11 At least one support member 141 includes a third support member 141c, at least a portion of the third support member 141c is located in the groove 1201 and connected to the second wall 1212, and the third support member 141c is against the first wall 1211.

[0131] It can be understood that at least one support member 141 is the third support member 141c. That is, when there is one support member 141, the support member 141 is the third support member 141c; when there are multiple support members 141, at least one support member 141 is the third support member 141c.

[0132] The third support member 141c may be integrally connected to the second wall 1212. The third support member 141c may also be separately connected to the second wall 1212 to achieve the fixing of the third support member 141c on the second wall 1212.

[0133] The third support member 141c is connected to the second wall 1212 and abuts against the first wall 1211, so that the third support member 141c can support the first wall 1211 to limit the relative movement between the first wall 1211 and the second wall 1212, thereby improving the problem of mutual pulling of the shell 12 at the groove 1201, and further improving the problem of fatigue cracks or even fractures of the shell 12 at the groove 1201, thereby improving the reliability of the battery cell 10.

[0134] In some further embodiments, the at least one support member 141 includes a fourth support member, at least a portion of which is located in the groove 1201 and connected to the first wall 1211 and the second wall 1212 .

[0135] The fourth support member may be connected to the first wall 1211 in one piece or in a separate piece. The fourth support member may be connected to the second wall 1212 in one piece or in a separate piece.

[0136] By setting a fourth support member connected to the first wall 1211 and the second wall 1212, the fourth support member can be stably positioned in the groove 1201 to stably achieve the supporting function, which helps to improve the problem of mutual pulling of the shell 12 at the groove 1201, and further improves the problem of fatigue cracks or even fractures of the shell 12 at the groove 1201, thereby improving the reliability of the battery cell 10.

[0137] It should be supplemented here that when the number of the support member 141 is one, the support member 141 may be the first support member 141a, the second support member 141b, the third support member 141c or the fourth support member. When the number of the support members 141 is multiple, each support member 141 in the multiple support members 141 may be the first support member 141a, the second support member 141b, the third support member 141c or the fourth support member, that is, the support structure 14 may include at least one of the first support member 141a, the second support member 141b, the third support member 141c and the fourth support member. Such an arrangement makes the arrangement of the support member 141 very flexible.

[0138] In some embodiments, please refer to Figure 8 and Fig. 9 , and in combination with other drawings, the second support member 141b is integrally formed with the first wall 1211 .

[0139] In this way, after the housing 12 forms the groove 1201, the second support member 141b is located in the groove 1201 and abuts against the second wall 1212, and there is no need to install the second support member 141b in the groove 1201 or fix the second support member 141b to the first wall 1211. In this way, the processing operation of the battery cell 10 is very simple.

[0140] In some embodiments, please refer to Fig.10 and Fig.11 , and in combination with other drawings. The third support member 141c is integrally formed with the second wall 1212.

[0141] In this way, after the housing 12 forms the groove 1201, the third support member 141c is located in the groove 1201 and abuts against the first wall 1211, and there is no need to install the third support member 141c in the groove 1201 or fix the third support member 141c to the second wall 1212. In this way, the processing operation of the battery cell 10 is very simple.

[0142] It should be supplemented here that the second support member 141b is integrally formed with the first wall 1211; or the third support member 141c is integrally formed with the second wall 1212; or the second support member 141b is integrally formed with the first wall 1211, and the third support member 141c is integrally formed with the second wall 1212. With such an arrangement, after the recess 1201 is formed in the housing 12, the support member 141 will be located in the recess 1201 and provide support, which makes the processing operation of the battery cell 10 very simple.

[0143] In some embodiments, please refer to Figure 8 and Fig. 9 In the first direction Z, the first wall 1211 is recessed away from the side of the second wall 1212 so that the first wall 1211 protrudes toward the side of the second wall 1212 to form the second support member 141b.

[0144] It can be understood that the first wall 1211 is recessed along the first direction Z away from the second wall 1212, so that the first wall 1211 protrudes along the first direction Z toward the second wall 1212 to form a second support member 141b, that is, the second support member 141b is integrally arranged with the first wall 1211.

[0145] In this way, the first wall 1211 can be directly protruded to form the second support member 141b, and the groove 1201 can be formed on the outer peripheral wall of the shell 12. The second support member 141b is located in the groove 1201 and can abut against the second wall 1212. In this way, the support member 141 can easily support the second wall 1212, and the processing operation of the battery cell 10 is very simple. In addition, the concave setting of the first wall 1211 also helps to maintain a better energy density of the battery cell 10.

[0146] In some embodiments, please refer to Fig.10 and Fig.11 In the first direction Z, the second wall 1212 is recessed away from the side of the first wall 1211, so that the second wall 1212 protrudes toward the side of the first wall 1211 to form a third support member 141c.

[0147] It can be understood that the second wall 1212 is recessed along the first direction Z away from the first wall 1211, so that the second wall 1212 protrudes along the first direction Z toward the first wall 1211 to form a third support member 141c, that is, the third support member 141c is integrally arranged with the second wall 1212.

[0148] In this way, the second wall 1212 can be directly protruded to form the third support member 141c, and a groove 1201 can be formed on the outer peripheral wall of the shell 12. The third support member 141c is located in the groove 1201 and can abut against the first wall 1211. In this way, the support member 141 can easily support the first wall 1211, and the processing operation of the battery cell 10 is very simple. In addition, the concave setting of the second wall 1212 also helps to maintain a better energy density of the battery cell 10.

[0149] It should be supplemented here that, in the first direction Z, the side of the first wall 1211 away from the second wall 1212 is recessed, so that the first wall 1211 protrudes toward the side of the second wall 1212 to form a second support member 141b. Alternatively, in the first direction Z, the side of the second wall 1212 away from the first wall 1211 is recessed, so that the second wall 1212 protrudes toward the side of the first wall 1211 to form a third support member 141c. Alternatively, in the first direction Z, the side of the first wall 1211 away from the second wall 1212 is recessed, so that the first wall 1211 protrudes toward the side of the second wall 1212 to form the second support member 141b; the side of the second wall 1212 away from the first wall 1211 is recessed, so that the second wall 1212 protrudes toward the side of the first wall 1211 to form the third support member 141c.

[0150] In this way, the support member 141 is integrally arranged on the housing 12, so that after the housing 12 forms the groove 1201, the support member 141 is located in the groove 1201 and achieves a supporting function, which can improve the problem of fatigue cracks or even fractures of the housing 12 at the groove 1201, making the processing operation of the battery cell 10 very simple. In addition, the recessed arrangement of at least one of the first wall 1211 and the second wall 1212 also helps to maintain a better energy density of the battery cell 10.

[0151] In some embodiments, see Fig.12 , and combined with other drawings. Among them, Fig.12 The schematic diagrams of the support members 141 of the battery cell 10 provided in some embodiments of the present application are specifically schematic diagrams of the support members 141 from the perspective of the first direction Z. In the circumferential direction Y of the groove 1201 , the support members 141 are continuously arranged.

[0152] It can be understood that the support member 141 is a continuously arranged annular structure.

[0153] Alternatively, in other embodiments, the support member 141 is disconnected in the circumferential direction Y of the groove 1201 .

[0154] It can be understood that the support member 141 can be divided into a plurality of parts, and the plurality of parts are arranged at intervals along the circumferential direction Y.

[0155] By adopting the above technical solution, the arrangement of the support member 141 is very flexible.

[0156] It can be understood that, in the circumferential direction Y of the groove 1201, the first support member 141a is arranged continuously or discontinuously, the second support member 141b is arranged continuously or discontinuously, and the third support member 141c is arranged continuously or discontinuously.

[0157] In some embodiments, the support member 141 includes at least one of a metal member, a ceramic member, and a rubber member.

[0158] It can be understood that the support member 141 may include a metal member, a ceramic member, a rubber member, or the like, which can support and limit the first wall 1211 and the second wall 1212 to reduce the relative movement range of the first wall 1211 and the second wall 1212 .

[0159] When there is one support member 141, the support member 141 may be a metal member, a ceramic member or a rubber member. When there are multiple support members 141, each support member 141 may be a metal member, a ceramic member or a rubber member.

[0160] Such a configuration enables the support member 141 to support and limit the two opposite walls of the groove 1201 along the first direction Z, so as to reduce the amplitude of relative movement of the two opposite walls of the groove 1201 along the first direction Z, thereby improving the problem of fatigue cracks or even fractures of the shell 12 at the groove 1201, and improving the reliability of the battery cell 10.

[0161] It should be noted that the groove 1201 is generally annular, so that the groove 1201 has an outer diameter and an inner diameter in the radial direction X of the groove 1201. Correspondingly, the support structure 14 is also generally annular, and in the radial direction X of the groove 1201, the support structure 14 also has an outer diameter and an inner diameter.

[0162] It should be supplemented here that, when the support structure 14 includes one support member 141, the outer diameter of the support structure 14 is the outer diameter of the support structure 14, and the inner diameter of the support structure 14 is the inner diameter of the support member 141. When the support structure 14 includes multiple support members 141, and the multiple support members 141 are sequentially arranged along the radial direction X of the groove 1201, the outer diameter of the support structure 14 is the outer diameter of the support member 141 located at the outermost side of the radial direction X, and the inner diameter of the support structure 14 is the inner diameter of the support member 141 located at the innermost side of the radial direction X.

[0163] In some embodiments, please refer to Figure 5 and Fig.12 , and in combination with other drawings. The support structure 14 satisfies the following relationship:

[0164] 0.2≤the difference between the outer diameter and the inner diameter of the support structure 14 along the radial direction X of the groove 1201 / the difference between the outer diameter and the inner diameter of the groove 1201 along the radial direction X≤1;

[0165] like Figure 5 and Fig.12 As shown in the figure, and combined with other figures. In the radial direction X of the groove 1201, the outer diameter of the support structure 14 is φ4, and the inner diameter of the support structure 14 is φ2. In the radial direction X of the groove 1201, the outer diameter of the groove 1201 is the outer diameter of the shell 12, the outer diameter of the shell 12 is φ3, and the inner diameter of the groove 1201 is φ1.

[0166] For ease of description, φ4-φ2=W1, that is, the difference between the outer diameter and the inner diameter of the supporting structure 14 along the radial direction X of the groove 1201 is W1; φ3-φ1=W2, that is, the difference between the outer diameter and the inner diameter of the groove 1201 along the radial direction X is W2. 0.2≤W1 / W2≤1, W1 / W2 can specifically be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, etc.

[0167] Such a configuration allows the support structure 14 to occupy a larger space of the groove 1201 in the radial direction X, so that the support structure 14 can stably and reliably support the two opposite walls of the groove 1201 along the first direction Z, thereby effectively reducing the amplitude of relative movement of the two opposite walls of the groove 1201 along the first direction Z, thereby improving the problem of fatigue cracks or even fractures of the shell 12 at the groove 1201, and improving the reliability of the battery cell 10.

[0168] In some embodiments, 0.8≤the difference between the outer diameter and the inner diameter of the support structure 14 along the radial direction X of the groove 1201 / the difference between the outer diameter and the inner diameter of the groove 1201 along the radial direction X≤1.

[0169] It can be understood that 0.8≤W1 / W2≤1. Specifically, W1 / W2 can be 0.8, 0.85, 0.9, 0.95, 1, etc.

[0170] Such an arrangement enables the support structure 14 to occupy a larger space of the groove 1201 in the radial direction X, so that the support structure 14 can stably and reliably support the two opposite walls of the groove 1201 along the first direction Z.

[0171] In some embodiments, please refer to Figure 5 and Fig.12 , and in combination with other figures. The support structure 14 satisfies the following relationship:

[0172] 0.2≤φ1 / φ2≤1;

[0173] In the radial direction X of the groove 1201 , the inner diameter of the groove 1201 is φ1, and the inner diameter of the support structure 14 is φ2.

[0174] Among them, φ1 / φ2 can specifically be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, etc.

[0175] Such arrangement enables the support structure 14 to be closer to the groove wall of the groove 1201 in the radial direction X. In this way, on the one hand, the problem of fatigue cracks or even fractures occurring at the connection of the two opposite walls of the groove 1201 in the first direction Z can be improved, thereby improving the problem of fatigue cracks or even fractures occurring at the part of the shell 12 at the groove 1201, thereby improving the reliability of the battery cell 10. On the other hand, when the support members 141 of the support structure 14 are continuously arranged along the circumferential direction Y, it is not easy for the support members 141 to separate from the groove 1201 in the radial direction X, thereby stably supporting and limiting the two opposite walls of the groove 1201 in the first direction Z.

[0176] In some embodiments, please refer to Figure 5 and Fig.12 , and in combination with other drawings. 0.8≤φ1 / φ2≤1.

[0177] Among them, φ1 / φ2 can specifically be 0.8, 0.85, 0.9, 0.95, 1, etc.

[0178] Such arrangement enables the support structure 14 to be closer to the groove wall of the groove 1201 in the radial direction X in a good manner. Thus, on the one hand, the problem of fatigue cracks or even fractures occurring at the connection of the two opposite walls of the groove 1201 in the first direction Z can be improved, thereby improving the problem of fatigue cracks or even fractures occurring at the part of the shell 12 at the groove 1201, thereby improving the reliability of the battery cell 10. On the other hand, when the support members 141 of the support structure 14 are continuously arranged in the circumferential direction Y, it is not easy for the support members 141 to separate from the groove 1201 in the radial direction X, thereby stably supporting and limiting the two opposite walls of the groove 1201 in the first direction Z.

[0179] In some embodiments, please refer to Figure 5 and Fig.12 , and in combination with other drawings. The housing 12 satisfies the following relationship:

[0180] 0.5≤φ1 / φ3<1;

[0181] In the radial direction X of the groove 1201 , the inner diameter of the groove 1201 is φ1, and the outer diameter of the housing 12 is φ3.

[0182] Among them, φ1 / φ3 can specifically be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, etc.

[0183] This arrangement allows the groove 1201 to have a larger inner diameter, which can avoid components such as adapters, poles, pole ears, explosion-proof valves, etc. In this way, the support structure 14 also has a correspondingly larger inner diameter, which helps the battery cell 10 have a better energy density.

[0184] In some embodiments, please refer to Figure 5 and Fig.12 , and in combination with other drawings. 0.8≤φ1 / φ3<1.

[0185] Among them, φ1 / φ3 can specifically be 0.8, 0.85, 0.9, 0.95, 1, etc.

[0186] This arrangement allows the groove 1201 to have a larger inner diameter, which can avoid components such as adapters, poles, pole ears, explosion-proof valves, etc. In this way, the support structure 14 also has a correspondingly larger inner diameter, which helps the battery cell 10 have a better energy density.

[0187] In some embodiments, please refer to Figure 5 and Fig.12 , and in combination with other figures. The support structure 14 satisfies the following relationship:

[0188] 0.5<φ4 / φ3≤1;

[0189] In the radial direction X of the groove 1201 , the outer diameter of the housing 12 is φ3, and the outer diameter of the supporting structure 14 is φ4.

[0190] Among them, φ4 / φ3 can specifically be 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, etc.

[0191] Such an arrangement enables the support structure 14 to be completely located in the groove 1201 and to be fully used to achieve the supporting function without protruding out of the groove 1201 to cause waste, so that the battery cell 10 can have a better energy density.

[0192] In some embodiments, please refer to Figure 5 , Fig.12 and Fig.13 , and combined with other drawings. Fig.13 for Fig.12 The side view of the support member 141 shown is specifically a schematic diagram of the support member 141 from the perspective of the radial direction X.

[0193] The support structure 14 satisfies the following relationship:

[0194] 0<T1 / T2<10;

[0195] Wherein, T1 is the dimension of the support structure 14 along the first direction Z, and T2 is the wall thickness of the shell 12 .

[0196] T1 is the dimension of the support structure 14 along the first direction Z, that is, the thickness of the support structure 14 .

[0197] Among them, T1 / T2 can specifically be 2, 3, 4, 5, 6, 7, 8, 9, etc.

[0198] Such configuration allows the thickness of the support structure 14 to be maintained within a reasonable range, thereby maintaining a better energy density of the battery cell 10 on the basis of being able to support two opposite walls of the groove 1201 along the first direction Z.

[0199] 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.

[0200] The battery 100 provided in the embodiment of the present application, by adopting the battery cell 10 involved above, can reduce the risk of fatigue cracks or even breakage of the portion of the shell 12 at the groove 1201, improve the reliability of the battery cell 10, and further improve the reliability of the battery 100.

[0201] 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.

[0202] 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 risk of fatigue cracks or even breakage in the portion of the shell 12 at the groove 1201, improve the reliability of the battery cell 10, and further improve the reliability of the electrical device.

[0203] As one of the embodiments of this application, Figures 4 to 7 As shown, the battery cell 10 includes an electrode assembly 11, a shell 12, an end cap 13 and a support structure 14. At least part of the electrode assembly 11 is disposed in the shell 12. The outer peripheral wall of the shell 12 is provided with a groove 1201 arranged along the circumferential direction Y. The end cap 13 is arranged at the end of the shell 12 along the first direction Z. The groove 1201 is provided with a first wall 1211 and a second wall 1212 opposite to each other along the first direction Z, and the first wall 1211 and the second wall 1212 are connected and bent relative to each other. At least part of the electrode assembly 11 is limited to a side of the first wall 1211 away from the second wall 1212 along the first direction Z, and at least part of the end cap 13 is limited to a side of the second wall 1212 away from the first wall 1211 along the first direction Z, that is, at least part of the electrode assembly 11 and at least part of the end cap 13 are respectively located on opposite sides of the groove 1201 along the first direction Z. At least a portion of the support structure 14 is disposed in the groove 1201, and the support structure 14 abuts against the first wall 1211 and the second wall 1212. The first direction Z and the circumferential direction Y of the groove 1201 are disposed perpendicularly.

[0204] 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, wherein at least a portion of the electrode assembly is disposed in the shell, and an outer peripheral wall of the shell is provided with a groove disposed in a circumferential direction; an end cap, arranged at an end of the housing along a first direction, at least a portion of the end cap and at least a portion of the electrode assembly being arranged at opposite sides of the groove along the first direction, respectively; the first direction is perpendicular to the circumference of the groove; The supporting structure is at least partially disposed in the groove.

2. The battery cell according to claim 1, characterized in that: The support structure includes a support member, at least a portion of which is located in the groove; When there are multiple support members, the multiple support members are distributed in sequence along the radial direction of the groove.

3. The battery cell according to claim 2, characterized in that: In the first direction, the groove wall of the groove forms a first wall and a second wall opposite to each other, at least a portion of the electrode assembly is disposed on a side of the first wall away from the second wall, and at least a portion of the end cap is disposed on a side of the second wall away from the first wall; At least one of the support members includes a first support member, at least a portion of which is located in the groove and abuts against the first wall and the second wall; and / or, at least one of the support members includes a second support member, at least a portion of which is located in the groove and connected to the first wall, and the second support member abuts against the second wall; and / or, at least one of the support members includes a third support member, at least a portion of which is located in the groove and connected to the second wall, and the third support member abuts against the first wall; and / or, at least one of the support members includes a fourth support member, at least a portion of which is located in the groove and connected to the first wall and the second wall.

4. The battery cell according to claim 3, characterized in that: The second support member is integrally formed with the first wall; And / or, the third support member and the second wall are formed integrally.

5. The battery cell according to claim 4, characterized in that: In the first direction, a side of the first wall away from the second wall is recessed, so that the first wall protrudes toward a side of the second wall to form the second support member; And / or, in the first direction, a side of the second wall away from the first wall is recessed, so that the second wall protrudes toward a side of the first wall to form the third support member.

6. The battery cell according to any one of claims 2 to 5, characterized in that: The support members are disposed continuously or discontinuously in the circumferential direction of the groove.

7. The battery cell according to any one of claims 2 to 6, characterized in that: The support member includes at least one of a metal member, a ceramic member, and a rubber member.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The support structure satisfies the following relationship: 0.2≤the difference between the outer diameter and the inner diameter of the supporting structure along the radial direction of the groove / the difference between the outer diameter and the inner diameter of the groove along the radial direction≤1.

9. The battery cell according to claim 8, characterized in that: 0.8≤the difference between the outer diameter and the inner diameter of the support structure along the radial direction of the groove / the difference between the outer diameter and the inner diameter of the groove along the radial direction≤1.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The support structure satisfies the following relationship: 0.2≤φ1 / φ2≤1; In the radial direction of the groove, the inner diameter of the groove is φ1, and the inner diameter of the supporting structure is φ2.

11. The battery cell according to claim 10, characterized in that: 0.8≤φ1 / φ2≤1.

12. The battery cell according to any one of claims 1 to 11, characterized in that: The housing satisfies the following relationship: 0.5≤φ1 / φ3<1; In the radial direction of the groove, the inner diameter of the groove is φ1, and the outer diameter of the shell is φ3.

13. The battery cell according to claim 12, characterized in that: 0.8≤φ1 / φ3<1.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The support structure satisfies the following relationship: 0.5<φ4 / φ3≤1; In the radial direction of the groove, the outer diameter of the shell is φ3, and the outer diameter of the supporting structure is φ4.

15. The battery cell according to any one of claims 1 to 14, characterized in that: The support structure satisfies the following relationship: 0<T1 / T2<10; T1 is the dimension of the supporting structure along the first direction, and T2 is the wall thickness of the shell.

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.

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