Battery monomer, battery and electric equipment

Abstract

The utility model discloses a battery monomer, a battery and electric equipment, the battery monomer comprises a shell, a first end cover assembly, an electrode assembly and a separator, the first end cover assembly comprises a clamping bulge and a first electrode lead-out piece, the electrode assembly is accommodated in the shell, the electrode assembly comprises a main body part and a tab, and the main body part is provided with a first electrode lead-out piece and a second electrode lead-out piece; the isolation piece is arranged between the first electrode leading-out piece and the main body part, the tab penetrates through the isolation piece and is electrically connected with the first electrode leading-out piece, the isolation piece comprises a limiting bulge, a limiting hole is formed in the limiting bulge, an elastic deformation structure is arranged on the hole wall of the limiting hole, and the clamping bulge is clamped and matched with the elastic deformation structure. The elastic deformation structure comprises a penetrating hole, and the elastic deformation structure is arranged to be capable of generating elastic deformation when the clamping protrusion is inserted into the limiting hole and passes through the penetrating hole. The elastic deformation structure is arranged on the separator, so that the assembly requirement can be met without arranging a deformation structure on the clamping bulge, and the condition that the clamping bulge is broken in the assembly process is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a battery cell, a battery, and an electrical device. Background Art

[0002] With the development of new energy, more and more fields use new energy as power. Due to advantages such as high energy density, rechargeability, safety, and environmental friendliness, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0003] A battery includes at least one battery cell. The battery cell includes a housing, a bracket, and a cover plate. The bracket is disposed inside the housing and is provided with a clamping hole. The cover plate is provided with a buckle. The buckle is a protruding member, and a deformation groove is formed on the protruding member so that the protruding member can be snapped into the clamping hole when the deformation groove undergoes elastic deformation. However, the deformation groove weakens the strength of the protruding member, making the protruding member prone to breakage during the assembly process. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery, and an electrical device, which solve the problem that the protruding member on the cover plate is prone to breakage during the assembly process.

[0005] A first aspect of the present application provides a battery cell, which includes:

[0006] A housing, the housing includes a first opening;

[0007] A first end cap assembly for closing the first opening. The first end cap assembly includes a clamping protrusion and a first electrode lead-out member;

[0008] An electrode assembly accommodated in the housing. The electrode assembly includes a main body portion and a tab extending from the main body portion;

[0009] An isolator, at least part of the isolator is disposed between the first electrode lead-out member and the main body portion. The tab passes through the isolator and is electrically connected to the first electrode lead-out member. The isolator includes a limiting protrusion, and a limiting hole is formed on the limiting protrusion. The limiting hole is formed along the thickness direction of the isolator, and an elastic deformation structure is provided on the hole wall of the limiting hole. The clamping protrusion is in clamping fit with the elastic deformation structure;

[0010] Wherein, the elastic deformation structure includes a through hole, the through hole is communicated with the limiting hole, and the elastic deformation structure is configured to be able to undergo elastic deformation when the clamping protrusion is inserted into the limiting hole and passes through the through hole.

[0011] Specifically, during assembly, the spacer is arranged inside the housing, and then the clamping protrusion of the first end cover assembly is inserted into the limiting hole of the limiting protrusion. As the clamping protrusion is gradually inserted, the clamping protrusion enters the through-hole of the elastic deformation structure. When the clamping protrusion passes through the through-hole, the elastic deformation structure undergoes elastic deformation so that the clamping protrusion can be in clamping cooperation with the elastic deformation structure. By arranging the elastic deformation structure on the spacer, the need to arrange a deformation structure on the clamping protrusion can be eliminated to meet the assembly requirements, thereby improving the structural strength of the clamping protrusion and reducing the occurrence of fracture of the clamping protrusion during the assembly process.

[0012] In some embodiments of the present application, the elastic deformation structure is a cylindrical structure. The inside of the cylindrical structure constitutes the through-hole, and a deformation gap is provided on the cylindrical structure. A gap is provided between the outer peripheral surface of the elastic deformation structure and the hole wall of the limiting hole. By providing the deformation gap, the elastic deformation structure has the ability to deform. At the same time, a gap is provided between the elastic deformation structure and the hole wall of the limiting hole, thereby providing a deformation space for the elastic deformation structure during elastic deformation, and effectively meeting the requirement for the clamping protrusion to pass through the through-hole of the elastic deformation structure, and effectively realizing the clamping cooperation between the clamping protrusion and the elastic deformation structure.

[0013] In some embodiments of the present application, the gap between the outer peripheral surface of the elastic deformation structure and the hole wall of the limiting hole shows an increasing trend in the direction from the first end cover assembly to the main body part. By setting the gap between the elastic deformation structure and the hole wall of the limiting hole, the elastic deformation structure has sufficient deformation space to meet the requirement for the clamping protrusion to pass through, thereby effectively realizing the clamping cooperation between the clamping protrusion and the elastic deformation structure.

[0014] In some embodiments of the present application, the cylindrical structure extends obliquely in the direction from the first end cover assembly to the main body part. In the direction from the first end cover assembly to the main body part, the elastic deformation structure of the cylindrical structure is arranged such that the elastic deformation structure of the cylindrical structure has a structure with a large end and a small end, and the end facing the first end cover assembly is the large end, and the end facing the main body part is the small end. The clamping protrusion penetrates into the through-hole from the large end, and as the clamping protrusion continuously penetrates, it effectively drives the elastic deformation structure to undergo elastic deformation, thereby realizing the clamping cooperation between the clamping protrusion and the elastic deformation structure.

[0015] In some embodiments of the present application, the snap protrusion includes a limiting flange. The cylindrical structure is configured such that when the limiting flange passes through the through hole, the size of the deformation gap increases and the diameter of the through hole increases, and after the limiting flange exits the through hole, the deformation gap resets and the diameter of the through hole resets, and the limiting flange is snap-connected to the side of the elastic deformation structure facing the main body portion. By providing the limiting flange and applying an external force to the elastic deformation structure when the limiting flange passes through the limiting hole, the elastic deformation structure undergoes elastic deformation by changing the size of the deformation gap, so that after the limiting flange passes through the through hole, it is snap-connected to the side of the elastic deformation structure facing the main body portion that has restored its elastic deformation, thereby improving the convenience of assembly.

[0016] In some embodiments of the present application, one end of the elastic deformation structure facing the main body portion is spaced apart from the main body portion. The limiting flange is provided between the elastic deformation structure and the main body portion, and the distance between the limiting flange and the main body portion is greater than or equal to zero. Specifically, the spacing space between one end of the elastic deformation structure facing the main body portion and the main body portion is used to accommodate the limiting flange, and the distance between the limiting flange and the main body portion is set to be greater than or equal to zero, thereby reducing the impact of the snap protrusion on the main body portion, and further improving the safety performance of the battery cell.

[0017] In some embodiments of the present application, the limiting hole includes a first hole section and a second hole section. The first hole section and the second hole section are located on opposite sides of the elastic deformation structure, and the first hole section is closer to the main body portion than the second hole section. Among them, the diameter of the first hole section is larger than the diameter of the second hole section. When the first end cap assembly is assembled with the separator, the snap protrusion is inserted in the direction from the second hole section to the first hole section. By setting the diameter of the first hole section to be larger than the diameter of the second hole section, when the snap protrusion passes through the elastic deformation structure, in the radial direction of the first hole section, the first hole section provides a larger deformation space for the elastic deformation structure, so that the elastic deformation structure can undergo elastic deformation.

[0018] In some embodiments of the present application, there is an arc transition between the first hole section and the elastic deformation structure. By providing an arc transition between the first hole section and the elastic deformation structure, the stress concentration at the connection position between the elastic deformation structure and the first hole section is reduced, and further the problem of the elastic deformation structure breaking due to stress concentration is reduced.

[0019] In some embodiments of the present application, the snap protrusion includes a limiting flange. The limiting flange is snap-connected to the side of the elastic deformation structure facing the main body portion, and the limiting flange is completely accommodated in the first hole section. When the first end cap assembly is assembled with the separator in place, the limiting flange is snap-connected to the side of the elastic deformation structure facing the main body portion and is accommodated by the first hole section, thereby reducing the situation where the limiting flange protrudes from the limiting hole, and further reducing the situation of adverse effects on the main body portion due to the limiting flange protruding from the limiting hole.

[0020] In some embodiments of the present application, the through hole includes a straight hole section and a transition hole section. The straight hole section and the transition hole section are connected, and the straight hole section is arranged farther from the first end cover assembly than the transition hole section. One end of the transition hole section is connected to the straight hole section, and the other end of the transition hole section is connected to the second hole section. Along the direction from the first end cover assembly to the main body portion, the size of the transition hole section shows a decreasing trend. During assembly, when the clamping protrusion is inserted into the through hole, it first passes through the transition hole, then enters the straight hole section, and finally the limiting flange of the clamping protrusion exits through the straight hole section. By setting the transition hole section, the guiding of the clamping protrusion during the insertion process is realized, the convenience of assembly is improved, and the assembly efficiency is effectively enhanced.

[0021] In some embodiments of the present application, the clamping protrusion further includes a connecting column. The limiting flange is connected to the first end cover assembly through the connecting column, and at least part of the connecting column is received in the through hole. By setting the connecting column, the limiting flange and the first end cover assembly are spaced apart, so that the limiting flange can effectively insert into the through hole of the elastic deformation structure and exit through the through hole, thereby realizing the clamping fit between the clamping protrusion and the elastic deformation structure.

[0022] In some embodiments of the present application, the connecting column includes a first connecting portion. The first connecting portion is connected to the limiting flange, and the dimension of the first connecting portion along the first direction is less than or equal to the dimension of the straight hole section along the first direction. The dimension of the limiting flange along the first direction is greater than the dimension of the straight hole section along the first direction. The first direction is perpendicular to the thickness direction of the spacer. By setting the dimensions of the first connecting portion and the limiting flange in the first direction, the elastic deformation structure can elastically deform when the limiting flange passes through the straight hole section, and recover the elastic deformation when the limiting flange exits. And the limiting flange is limited by the elastic deformation structure that recovers the elastic deformation, reducing the situation of reverse detachment of the limiting flange, thereby improving the structural stability of the connection position.

[0023] In some embodiments of the present application, along the first direction, the dimension of the first connecting portion is greater than or equal to 0.8 mm and less than or equal to 3 mm. By setting the dimension of the first connecting portion in the first direction, the structural strength of the first connecting portion can be improved, and the situation of the first connecting portion being broken due to force is reduced.

[0024] In some embodiments of the present application, the connecting column further includes a transition connecting portion. The first connecting portion is connected to the first end cover assembly through the transition connecting portion, and at least part of the transition connecting portion is disposed in the transition hole section. Along the direction from the first end cover assembly to the main body portion, the dimension of the transition connecting portion along the first direction shows a decreasing trend. By setting the transition connecting portion, the structural strength of the clamping protrusion can be increased, and the situation of the clamping protrusion being broken during the assembly process is further reduced.

[0025] In some embodiments of the present application, the connecting column further includes a second connecting portion, the transition connecting portion is connected to the first end cap assembly via the second connecting portion, and the second connecting portion is accommodated in the second hole segment. The second connecting portion is provided and arranged in the second hole segment, and in the first direction, the second hole segment forms a limit for the second connecting portion, thereby reducing the movement of the clamping protrusion relative to the isolation member in the first direction, and improving the assembly accuracy of the first end cap assembly.

[0026] In some embodiments of the present application, a first angle is formed between the hole wall of the transition hole segment and the central axis of the through hole, a second angle is formed between the outer peripheral surface of the transition connection portion and the central axis of the connecting column, the first angle is less than or equal to the second angle, wherein the direction of the central axis of the through hole is consistent with the direction of the central axis of the connecting column. By setting the transition hole segment and the transition connection portion, the transition connection portion can effectively adapt to the shape of the transition hole segment, reducing the influence of factors such as manufacturing tolerance on assembly, so that the assembly operation can be carried out effectively.

[0027] In some embodiments of the present application, the first angle is greater than or equal to 20 degrees and less than or equal to 75 degrees. By setting the first angle, the convenience of processing is improved while guiding the clamping protrusion.

[0028] In some embodiments of the present application, the second angle is greater than or equal to 20 degrees and less than or equal to 75 degrees. By setting the second angle, the transition connection portion can effectively adapt to the structure of the transition hole section, so that assembly can be carried out effectively.

[0029] In some embodiments of the present application, the limiting flange surface tends to decrease along the thickness direction of the isolation plate. By setting the limiting flange, the side of the limiting flange away from the first end cover assembly is narrowed, so that the limiting flange is easily inserted into the limiting hole, thereby improving the convenience of assembly.

[0030] In some embodiments of the present application, there are multiple deformation gaps, and the multiple deformation gaps are arranged at intervals along the circumferential direction of the limiting hole. By providing multiple deformation gaps, the elastic deformation capacity of the elastic deformation structure is improved, thereby improving the convenience of the clamping protrusion passing through the penetration hole, so that the assembly efficiency is effectively improved.

[0031] In some embodiments of the present application, the deformation gap is in a linear structure or a curved structure. By setting the shape of the deformation gap, the deformation gap can be set according to demand, thereby meeting production needs.

[0032] In some embodiments of the present application, along the circumferential direction of the limiting hole, the size of the deformation gap is greater than or equal to 0.3 mm and less than or equal to 1.5 mm. By setting the size of the deformation gap in the circumferential direction of the limiting hole, the limiting hole has sufficient structural strength while having elastic deformation performance, thereby reducing the occurrence of the clamping protrusion falling off.

[0033] In some embodiments of the present application, the isolating member further comprises an isolating plate, and the limiting protrusion is protrudingly arranged on a side of the isolating member facing the first end cap assembly. The isolating plate is arranged between the first end cap assembly and the main body, and the isolating plate is used to block the first end cap assembly and the main body, thereby improving the barrier performance.

[0034] In some embodiments of the present application, the isolating member further comprises a side plate, which is arranged around the isolating plate in the circumferential direction and connected to the isolating plate, and one end of the side plate facing the main body is arranged flush with one end of the isolating plate facing the main body. The side plate surrounds the outer side of the isolating plate and protrudes from the side of the isolating plate away from the main body, so that the isolating plate and the side plate can jointly define a receiving recess, and the receiving recess can receive at least part of the pole ear, so as to improve the compactness of the structure.

[0035] In some embodiments of the present application, the isolation member further includes a reinforcing structure, which is respectively connected to the isolation plate, the limiting protrusion and the side plate. The reinforcing structure is provided to improve the connection strength between the limiting protrusion and the isolation plate, and reduce the possibility of the limiting protrusion breaking relative to the isolation plate.

[0036] In some embodiments of the present application, there are multiple reinforcement structures, which are arranged at intervals along the circumferential direction of the limiting protrusion. The multiple reinforcement structures further improve the structural strength of the limiting protrusion and further reduce the situation where the limiting protrusion breaks relative to the isolation plate.

[0037] In some embodiments of the present application, the first end cap assembly further includes a first end cap and an insulating member, the first electrode lead-out member is disposed on the first end cap, the insulating member includes an insulating body and a snap-on protrusion, the insulating body is disposed on the side of the first end cap facing the main body, and the snap-on protrusion is fixed to the side of the insulating body facing the main body. The first end cap covers the first opening of the shell, and the first electrode lead-out member on the first end cap is electrically connected to the pole ear, and the snap-on protrusion of the insulating member is snap-on with the elastic deformation structure in the limiting hole of the isolating member. The arrangement of the first end cap assembly facilitates the connection of the first end cap assembly, the isolating member, and the electrode assembly.

[0038] In some embodiments of the present application, the housing further has a second opening opposite to the first opening, and the battery cell further includes a second end cap assembly for closing the second opening. The first end cap assembly and the second end cap assembly are respectively used for closing the first opening and the second opening at both ends of the housing, so as to facilitate sealing the housing.

[0039] A second aspect of the present application provides a battery, which includes the battery cell as described above.

[0040] When assembling the battery cell in the battery, the separator is disposed in the housing, and then the clamping protrusion of the first end cap assembly is inserted into the limiting hole of the limiting protrusion. As the clamping protrusion is gradually inserted, the clamping protrusion enters the through hole of the elastic deformation structure. When the clamping protrusion passes through the through hole, the elastic deformation structure undergoes elastic deformation so that the clamping protrusion can be clamped and matched with the elastic deformation structure. By providing the elastic deformation structure on the separator, it is possible to meet the assembly requirements without providing a deformation structure on the clamping protrusion, thereby improving the structural strength of the clamping protrusion and reducing the occurrence of fracture of the clamping protrusion during the assembly process.

[0041] A third aspect of the present application provides an electrical device, which includes the battery as described above.

[0042] In the electrical device, when assembling the battery cell in the battery, the separator is disposed in the housing, and then the clamping protrusion of the first end cap assembly is inserted into the limiting hole of the limiting protrusion. As the clamping protrusion is gradually inserted, the clamping protrusion enters the through hole of the elastic deformation structure. When the clamping protrusion passes through the through hole, the elastic deformation structure undergoes elastic deformation so that the clamping protrusion can be clamped and matched with the elastic deformation structure. By providing the elastic deformation structure on the separator, it is possible to meet the assembly requirements without providing a deformation structure on the clamping protrusion, thereby improving the structural strength of the clamping protrusion and reducing the occurrence of fracture of the clamping protrusion during the assembly process.

[0043] The above description is only an overview of the technical solution of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Schematically shows a structural diagram of a vehicle according to an embodiment of the present application;

[0045] Figure 2 Schematically shows a structural diagram of a battery according to an embodiment of the present application;

[0046] Figure 3Schematically shows an exploded structural view of a battery cell according to an embodiment of the present application;

[0047] Figure 4 is Figure 3 a cross-sectional view of the battery cell shown in the assembled state (showing a partial structure);

[0048] Figure 5 is Figure 4 an enlarged structural view of part A of the battery cell shown;

[0049] Figure 6 is Figure 3 a structural view of the support member shown;

[0050] Figure 7 is Figure 6 a cross-sectional view of the B-B part of the support member shown;

[0051] Figure 8 is Figure 7 an enlarged structural view of part C of the support member shown in ;

[0052] Figure 9 is Figure 6 a structural view of the support member shown in from another perspective;

[0053] Figure 10 is Figure 3 a structural view of the first cover plate shown in (showing the electrode terminals);

[0054] Figure 11 is Figure 10 a structural view of the first cover plate shown in from another perspective;

[0055] Figure 12 is Figure 11 an enlarged structural view of part D of the first cover plate shown in .

[0056] The reference numerals are as follows:

[0057] 1000, vehicle;

[0058] 100, battery; 200, controller; 300, motor;

[0059] 110, battery assembly;

[0060] 10, battery cell;

[0061] 11, housing;

[0062] 111, first opening;

[0063] 12, separator;

[0064] 121. Limiting hole; 1211. First hole section; 1212. Second hole section; 122. Through hole; 123. Limiting protrusion; 1231. Penetrating hole; 12311. Straight hole section; 12312. Transition hole section; 1232. Deformation gap; 124. Partition board; 125. Side board; 126. Reinforcing structure;

[0065] 13. First end cap assembly;

[0066] 131. Clamping protrusion; 1311. Limiting flange; 1312. Connecting column; 13121. First connecting part; 13122. Transition connecting part; 13123. Second connecting part; 132. Liquid injection hole; 133. Baffle; 134. First end cap; 135. Insulating part;

[0067] 14. Electrode assembly;

[0068] 141. Main body part; 142. Tab;

[0069] 15. Second end cap assembly;

[0070] 16. Insulating film;

[0071] 17. First electrode lead-out part;

[0072] 120. Box body;

[0073] 1201. First part; 1202. Second part.

[0074] a. Thickness direction of the separator; b. First direction; a1. First included angle; a2. Second included angle; m. Preset gap; d1. First diameter; d2. Second diameter; d3. Third diameter; p. Width dimension. Detailed implementation manners

[0075] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0077] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0078] Reference to "embodiments" in this text means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0079] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0080] In the description of the embodiments of the present application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0081] In the description of the embodiments of the present application, technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0082] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0083] At present, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation means such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of batteries, the market demand is also constantly increasing.

[0084] In related technologies, a battery includes at least one battery cell. The battery cell includes a housing, a bracket, and a cover plate. The bracket is disposed inside the housing and is provided with a card hole. The cover plate is provided with a buckle. The buckle is a protruding member, and a deformation groove is formed in the protruding member so that the protruding member can be snapped into the card hole when elastic deformation occurs in the deformation groove. However, the deformation groove weakens the strength of the protruding member, making the protruding member prone to breakage during the assembly process.

[0085] In this application, the battery cell includes a housing, a first end cover assembly, an electrode assembly, and a separator. The housing includes a first opening. The first end cover assembly is used to cover the first opening. The first end cover assembly includes a clamping protrusion and a first electrode lead-out member. The electrode assembly is accommodated inside the housing. The electrode assembly includes a main body portion and a tab extending from the main body portion. At least part of the separator is disposed between the first electrode lead-out member and the main body portion. The tab passes through the separator and is electrically connected to the first electrode lead-out member. The separator includes a limiting protrusion, and a limiting hole is formed in the limiting protrusion. The limiting hole is formed along the thickness direction of the separator, and an elastic deformation structure is provided on the hole wall of the limiting hole. The clamping protrusion is in clamping fit with the elastic deformation structure. Among them, the elastic deformation structure includes a through hole, and the through hole is communicated with the limiting hole. The elastic deformation structure is configured to be capable of elastic deformation when the clamping protrusion is inserted into the limiting hole and passes through the through hole. Specifically, during assembly, the separator is disposed inside the housing, and then the clamping protrusion of the first end cover assembly is inserted into the limiting hole of the limiting protrusion. As the clamping protrusion is gradually inserted, the clamping protrusion enters the through hole of the elastic deformation structure. When the clamping protrusion passes through the through hole, the elastic deformation structure undergoes elastic deformation so that the clamping protrusion can be in clamping fit with the elastic deformation structure. By providing the elastic deformation structure on the separator, it is possible to meet the assembly requirements without setting a deformation structure on the clamping protrusion, thereby improving the structural strength of the clamping protrusion and reducing the occurrence of breakage of the clamping protrusion during the assembly process.

[0086] The battery involved in the embodiment of this application can be but is not limited to being used in power-consuming devices such as vehicles, ships, or aircraft. A power supply system of the power-consuming device can be composed of the battery cell and the battery involved in this application.

[0087] In addition, the electrical devices powered by batteries can include, but are not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, and so on. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0088] The technical solutions described in the embodiments of the present application are not only limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity of description, the following embodiments will be described by taking electric vehicles as an example.

[0089] For example, as Figure 1 shown, it is a schematic structural diagram of a vehicle according to an embodiment of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc. A motor 300, a controller 200, and a battery 100 can be arranged inside the vehicle 1000. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, the battery 100 can be arranged at the bottom, the front end, or the rear end of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000 and be used for the circuit system of the vehicle 1000, such as for the working power requirements during the start-up, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000 to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0090] As Figure 2 shown, the battery 100 can include a plurality of battery modules 110 and a box body 120. The plurality of battery modules 110 are accommodated inside the box body 120.

[0091] In order to meet different power usage requirements, the battery module 110 can include a plurality of battery cells 10 and a busbar component. The battery cell 10 is the smallest unit that makes up the battery module 110. The busbar component is used to achieve electrical connection between the plurality of battery cells 10 for various application scenarios, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 10 by connecting the electrode lead-out parts of the battery cell 2. The battery cell 10 can include, but is not limited to, lithium-ion batteries 100, sodium-ion batteries 100, or magnesium-ion batteries 100, etc. In addition, the shape of the battery cell 10 includes, but is not limited to, cylindrical, flat, cuboid, or other shapes, etc.

[0092] The housing 120 is used to accommodate the battery assembly 110 to reduce the influence of liquid or other foreign objects on the charging or discharging of the battery cells 10. The housing 120 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, cylinder, or sphere, etc. The material of the housing 120 can be alloy materials such as aluminum alloy and ferroalloy, or polymer materials such as polycarbonate and polyisocyanurate foam, or composite materials such as glass fiber reinforced epoxy resin, etc.

[0093] As Figure 2 shown, the housing 120 can include a first part 1201 and a second part 1202. The first part 1201 and the second part 1202 cover each other, and the first part 1201 and the second part 1202 jointly define a space for accommodating the battery assembly 110. The second part 1202 can be a hollow structure with an open end, and the first part 1201 can be a plate-like structure. The first part 1201 covers the open side of the second part 1202 so that the first part 1201 and the second part 1202 jointly define a space for accommodating the battery assembly 110; the first part 1201 and the second part 1202 can also both be hollow structures with an open side, and the open side of the first part 1201 covers the open side of the second part 1202.

[0094] In some embodiments of the present application, as Figures 3 to 12 shown, a battery cell 10 is proposed. The battery cell 10 includes a housing 11, a first end cap assembly 13, an electrode assembly 14, and a separator 12. The housing 11 includes a first opening. The first end cap assembly 13 is used to cover the first opening. The first end cap assembly 13 includes a clamping protrusion 131 and a first electrode lead-out member 17. The electrode assembly 14 is accommodated in the housing 11. The electrode assembly 14 includes a main body portion 141 and a tab 142 extending from the main body portion 141. At least a part of the separator 12 is disposed between the first electrode lead-out member 17 and the main body portion 141. The tab 142 passes through the separator 12 and is electrically connected to the first electrode lead-out member 17. The separator 12 includes a limiting protrusion 123. A limiting hole 121 is formed in the limiting protrusion 123. The limiting hole 121 is opened along the thickness direction a of the separator 12. An elastic deformation structure is provided on the hole wall of the limiting hole 121. The clamping protrusion 131 is in clamping fit with the elastic deformation structure. Among them, the elastic deformation structure includes a through hole 1231. The through hole 1231 is communicated with the limiting hole 121. The elastic deformation structure is configured to be able to undergo elastic deformation when the clamping protrusion 131 is inserted into the limiting hole 121 and passes through the through hole 1231.

[0095] As Figure 3As shown, the housing 11 can be a hollow structure with an opening on one side or a hollow structure with openings on both sides. For example, the housing 11 is provided with an opening, which is the first opening. For another example, the housing 11 can also be provided with openings other than the first opening.

[0096] The housing 11 is used to accommodate the electrode assembly 14. Wherein, the shape of the housing 11 can be determined according to the shape of one or more combined electrode assemblies 14. For example, the housing 11 is a hollow cuboid. The embodiments of the present application include but are not limited to this. The housing 11 can also be a hollow cube, cylinder or other shapes.

[0097] The material of the housing 11 can be various. For example, the material of the housing 11 can be metal or plastic. As some examples, the material of the housing 11 can be copper, iron, aluminum, steel, aluminum alloy, etc.

[0098] As Figure 3 and Figure 11 As shown, the first end cap assembly 13 includes a clamping protrusion 131 and a first electrode lead-out member 17. Wherein, the first electrode lead-out member 17 is used to electrically connect the electrode assembly 14 to the circuit outside the battery cell 10 to realize the charge and discharge of the electrode assembly 14. As an example, at least part of the first electrode lead-out member 17 is exposed to the outside of the battery cell 10 to facilitate connection with the bus bar component, and then lead out the electric energy generated by the electrode assembly 14.

[0099] The electrode assembly 14 is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 10 mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector without the coated positive electrode active material layer protrudes from the current collector with the coated positive electrode active material layer. The current collector without the coated positive electrode active material layer serves as the positive electrode tab 142. Taking the lithium-ion battery 100 as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the coated negative electrode active material layer protrudes from the current collector with the coated negative electrode active material layer. The current collector without the coated negative electrode active material layer serves as the negative electrode tab 142. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure passing a large current without fusing, the number of positive electrode tabs 142 is multiple and stacked together, and the number of negative electrode tabs 142 is multiple and stacked together. The material of the separator can be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly 14 can be a wound structure or a stacked structure. The embodiments of the present application are not limited thereto.

[0100] In the electrode assembly 14, the tab 142 can be directly connected to the first electrode lead-out member 17, or can be indirectly connected to the first electrode lead-out member 17 via other conductive structures.

[0101] A plurality of tabs 142 can be provided. The plurality of tabs 142 include a positive tab 142 and a negative tab 142. The positive tab 142 and the negative tab 142 can be led out from the same end of the main body portion 141, or can be respectively led out from opposite ends of the main body portion 141 along the thickness direction a of the first end cap assembly 13.

[0102] The tab 142 can include a plurality of tab layers, and the plurality of tab layers are stacked together to form the tab 142. The tab 142 can include at least two parts, one part is located between the main body portion 141 and the separator 12, and the other part is located between the separator member and the first electrode lead-out member 17.

[0103] The separator 12 can insulate and isolate at least part of the tab 142 from the end face of the main body portion 141, so that when the battery cell 10 is affected by external impacts, vibrations, etc., the risk of the tab 142 being inserted into the main body portion 141 is reduced, thereby the risk of short circuit of the battery cell 10 can be reduced, which is beneficial to improving the reliability of the battery cell 10.

[0104] The separator 12 can be partially disposed between the first electrode lead-out member 17 and the main body portion 141, or can be integrally disposed between the first electrode lead-out member 17 and the main body portion 141.

[0105] The separator 12 can be an integral structure or a split structure. As an example, the separator 12 is formed by connecting a plurality of independently formed parts. As another example, the separator 12 is integrally formed by stamping.

[0106] In this application, the first opening is formed in the housing 11 and communicates with the inside of the housing 11. The internal components of the battery cell 10 such as the separator 12 can be installed through the first opening. When the first end cap assembly 13 is assembled on the housing 11, the first end cap assembly 13 closes the first opening to isolate the inside and outside of the battery cell 10 at the position of the first opening. Among them, a first sealing structure can be provided at the joint position between the first end cap assembly 13 and the first opening, and the first sealing structure includes but is not limited to a sealing ring or a sealing adhesive, etc.

[0107] In the present application, the limiting protrusion 123 is provided on the separator 12, and the limiting protrusion 123 protrudes relative to the surface having the limiting protrusion 123. The limiting hole 121 is opened on the limiting protrusion 123, and the opening direction (depth direction) of the limiting hole 121 is along the thickness direction a of the separator 12 (the arrangement direction of the first end cap assembly 13 and the main body portion 141 is the same as the thickness direction a of the separator 12) or is arranged at an acute angle to the thickness direction a of the separator 12.

[0108] As Figures 4 to 9 shown, the elastic deformation structure is arranged in the limiting hole 121 of the limiting protrusion 123, and the elastic deformation structure is connected to the hole wall of the limiting hole 121. Among them, along the radial direction of the limiting hole 121 (the radial direction of the limiting hole 121 is the same as the first direction b, where the first direction b is perpendicular to the thickness direction a of the separator 12), the elastic deformation structure protrudes relative to the hole wall of the limiting hole 121, and the through hole 1231 is opened on the elastic deformation structure. The elastic deformation structure can elastically deform along the radial direction of the limiting hole 121 when the clamping protrusion 131 is inserted into the through hole 1231.

[0109] When assembling the battery cell 10 in the present application, the separator 12 is arranged in the housing 11, and then the clamping protrusion 131 of the first end cap assembly 13 is inserted into the limiting hole 121 of the limiting protrusion 123. As the clamping protrusion 131 is gradually inserted, the clamping protrusion 131 enters the through hole 1231 of the elastic deformation structure. When the clamping protrusion 131 passes through the through hole 1231, the elastic deformation structure elastically deforms so that the clamping protrusion 131 can be clamped and matched with the elastic deformation structure. By arranging the elastic deformation structure on the separator 12, it is possible to meet the assembly requirements without setting a deformation structure on the clamping protrusion 131, thereby improving the structural strength of the clamping protrusion 131 and reducing the occurrence of fracture of the clamping protrusion 131 during the assembly process.

[0110] It should be understood that in the present application, the clamping protrusion 131 is clamped and matched with the elastic deformation structure, where the clamping and matching means that the clamping protrusion 131 and the elastic deformation structure are matched by clamping, and relative movement (such as rotation or translation, etc.) can occur between the clamping protrusion 131 and the elastic deformation structure.

[0111] It should be noted that in the present application, the number of the clamping protrusions 131 can be one, two, three, four, five, six, seven, eight, etc. When the number of the clamping protrusions 131 is multiple (two or more), the multiple clamping protrusions 131 are dispersedly arranged on the same side of the first end cap assembly 13 facing the main body portion 141. By arranging multiple clamping protrusions 131, the fixing strength and stability of the first end cap assembly 13 can be improved.

[0112] In addition, the number of the limiting protrusions 123 is consistent with the number of the clamping protrusions 131, and each clamping protrusion 131 is arranged corresponding to a limiting protrusion 123.

[0113] In some embodiments of the present application, as Figures 5 to 9 shown, the elastic deformation structure is a cylindrical structure. The inside of the cylindrical structure constitutes a through hole 1231, a deformation gap 1232 is formed on the cylindrical structure, and there is a gap between the outer peripheral surface of the elastic deformation structure and the hole wall of the limiting hole 121.

[0114] Specifically, the cylindrical structure is a hollow structure with both ends open. One axial end of the cylindrical structure is connected to the hole wall of the limiting hole 121 (the connection methods include but are not limited to bonding, welding, connecting through a connecting piece or integrally forming), and the other axial end of the cylindrical structure is arranged at an interval from the hole wall of the limiting hole 121, so that there is a gap between the elastic deformation structure of the cylindrical structure and the hole wall of the limiting hole 121.

[0115] The deformation gap 1232 is formed on the side wall of the cylindrical structure. The deformation gap 1232 runs through the inside and outside of the cylindrical structure. At the same time, along the axial direction of the cylindrical structure, the deformation gap 1232 is at least communicated with one end of the cylindrical structure facing the main body part 141.

[0116] During assembly, the spacer 12 is arranged in the housing 11 from the first opening of the housing 11 and abuts against the main body part 141 of the electrode assembly 14. At the same time, the tab 142 passes through the spacer 12. Then, the side of the first end cap assembly 13 with the clamping protrusion 131 is arranged facing the spacer 12. The tab 142 is electrically connected to the first electrode lead-out member 17 on the first end cap assembly 13. Then, the clamping protrusion 131 is inserted into the limiting hole 121. When the clamping protrusion 131 is inserted into the through hole 1231 of the elastic deformation structure, the elastic deformation structure elastically deforms along the radial direction of the limiting hole 121 (the radial direction of the limiting hole 121 is consistent with the first direction b, where the first direction b is perpendicular to the thickness direction a of the spacer 12) (elastically deforms from the radial inner side of the limiting hole 121 to the radial outer side of the limiting hole 121). At this time, the deformation gap 1232 increases, so that the aperture of the through hole 1231 increases, thereby meeting the threading requirement of the clamping protrusion 131.

[0117] The deformation gap 1232 is provided, so that the elastic deformation structure has the deformation ability, thereby being able to meet the deformation requirement when the clamping protrusion 131 passes through the through hole 1231. At the same time, a gap is provided between the elastic deformation structure and the hole wall of the limiting hole 121, thereby providing a deformation space for the elastic deformation structure during elastic deformation, and further effectively meeting the requirement for the clamping protrusion 131 to pass through the through hole 1231 of the elastic deformation structure, and effectively realizing the clamping fit between the clamping protrusion 131 and the elastic deformation structure.

[0118] In some embodiments of the present application, as Figure 5 and Figure 8 shown, the gap between the outer peripheral surface of the elastic deformation structure and the hole wall of the limiting hole 121 shows an increasing trend along the direction from the first end cover assembly 13 to the main body portion 141.

[0119] Specifically, the elastic deformation structure is a cylindrical structure, which is coaxially arranged with the limiting hole 121. The axial direction of the cylindrical structure includes a first end and a second end. Among them, the first end faces the first end cover assembly 13 and is connected to the hole wall of the limiting hole 121, and the second end faces away from the first end cover assembly 13 and is spaced from the hole wall of the limiting hole 121.

[0120] The outer peripheral surface of the elastic deformation structure is arranged between the first end and the second end. Along the radial direction of the limiting hole 121 (the radial direction of the limiting hole 121 is consistent with the first direction b, where the first direction b is perpendicular to the thickness direction a of the spacer 12), there is a spacing distance between the outer peripheral surface of the elastic deformation structure and the hole wall of the limiting hole 121. This spacing distance shows an increasing trend along the axial direction of the cylindrical structure (the direction from the first end cover assembly 13 to the main body portion 141). Among them, the increasing trend can be a continuous structure or an intermittent structure.

[0121] In the present application, the elastic deformation structure in the form of a cylindrical structure is a frustum-shaped structure (the spacing distance between the outer peripheral surface of the elastic deformation structure and the hole wall of the limiting hole 121 is gradually and continuously increasing from the first end to the second end). Among them, the first end is the large end of the frustum-shaped structure, and the second end is the small end of the frustum-shaped structure. The shape of the through hole 1231 is the same as the shape of the cylindrical structure, that is, the diameter of the through hole 1231 at the first end is larger than the diameter at the second end. When the clamping protrusion 131 passes through the through hole 1231, as the clamping protrusion 131 is continuously inserted, the clamping protrusion 131 forms extrusion on the inner wall of the through hole 1231. Under the action of the extrusion force, the elastic deformation structure (the body except the first end) deforms elastically along the radial direction of the limiting hole 121 (the radial direction of the limiting hole 121 is consistent with the first direction b, where the first direction b is perpendicular to the thickness direction a of the spacer 12), so that the aperture of the through hole 1231 increases to meet the passing requirement of the clamping protrusion 131.

[0122] By setting the gap between the elastic deformation structure and the hole wall of the limiting hole 121, the elastic deformation structure has sufficient deformation space to meet the passing requirement of the clamping protrusion 131, thereby effectively realizing the clamping fit between the clamping protrusion 131 and the elastic deformation structure.

[0123] In some embodiments of the present application, as Figure 5 and Figure 8As shown, the cylindrical structure extends obliquely in the direction from the first end cap assembly 13 to the main body portion 141.

[0124] Specifically, the elastic deformation structure of the cylindrical structure includes a first end and a second end in the axial direction. Among them, the first end faces the first end cap assembly 13 and is connected to the hole wall of the limiting hole 121, and the second end faces away from the first end cap assembly 13 and is not connected to the hole wall of the limiting hole 121.

[0125] The fact that the cylindrical structure extends obliquely in the direction from the first end cap assembly 13 to the main body portion 141 means that the second end of the side wall of the cylindrical structure is obliquely arranged from the hole wall of the limiting hole 121 to the central axis of the limiting hole 121, so that the distance between the second end and the hole wall of the limiting hole 121 is greater than the distance between the first end and the hole wall of the limiting hole 121, and further makes the cylindrical structure form a frustum-shaped structure (the first end is the small end and the second end is the large end).

[0126] In the direction from the first end cap assembly 13 to the main body portion 141, the elastic deformation structure of the cylindrical structure is arranged so that the elastic deformation structure of the cylindrical structure has a structure with a large end and a small end, and the end facing the first end cap assembly 13 is the large end (the first end), and the end facing the main body portion 141 is the small end (the second end). The clamping protrusion 131 penetrates into the through hole 1231 from the large end, and as the clamping protrusion 131 continuously penetrates, it effectively drives the elastic deformation structure to elastically deform, thereby realizing the clamping fit between the clamping protrusion 131 and the elastic deformation structure.

[0127] In some embodiments of the present application, as Figure 5 , Figure 10 and Figure 12 shown, the clamping protrusion 131 includes a limiting flange 1311. The cylindrical structure is configured such that when the limiting flange 1311 passes through the through hole 1231, the size of the deformation gap 1232 expands and the diameter of the through hole 1231 increases, and after the limiting flange 1311 exits the through hole 1231, the deformation gap 1232 resets and the diameter of the through hole 1231 resets, and the limiting flange 1311 is clamped on the side of the elastic deformation structure facing the main body portion 141.

[0128] Specifically, in the present application, the clamping protrusion 131 includes a limiting flange 1311, and the limiting flange 1311 is spaced apart from the first end cap assembly 13. When the first end cap assembly 13 is installed in place, the limiting flange 1311 is in clamping fit with the side of the elastic deformation structure facing the main body portion 141, and the limiting flange 1311 can form a limit on the first end cap assembly 13 in the thickness direction a of the spacer 12, so as to keep the first end cap assembly 13 in the assembled state.

[0129] The maximum diameter of the limiting flange 1311 is greater than the minimum diameter of the through hole 1231. When the first end cap assembly 13 is assembled, the limiting flange 1311 is inserted into the limiting hole 121 and moves along the limiting hole 121 in the direction close to the elastic deformation structure. When the limiting flange 1311 is inserted into the through hole 1231, as the limiting flange 1311 is continuously inserted, when the limiting flange 1311 passes through the position with a smaller diameter (the position where the diameter of the limiting flange 1311 is greater than the diameter of the through hole 1231), the limiting flange 1311 exerts extrusion on the hole wall of the through hole 1231. Under the drive of the extrusion force, the elastic deformation structure undergoes elastic deformation (the deformation gap 1232 increases), so that the through hole 1231 is expanded and its diameter is increased to meet the passing requirement of the limiting flange 1311. When the limiting flange 1311 exits from the through hole 1231, the elastic deformation structure resets, and the expanded through hole 1231 returns to its original diameter. The diameter of the reset through hole 1231 cannot allow the limiting flange 1311 to pass in the reverse direction from the main body portion 141 to the first end cap assembly 13, so that the limiting flange 1311 is limited between the elastic deformation structure and the main body portion 141.

[0130] The limiting flange 1311 is provided, and an external force is applied to the elastic deformation structure by using the limiting flange 1311 when passing through the limiting hole 121, so that the elastic deformation structure undergoes elastic deformation by changing the size of the deformation gap 1232, so as to allow the limiting flange 1311 to pass through the through hole 1231 and be clamped and matched with the side of the elastic deformation structure facing the main body portion 141 after restoring elastic deformation, thereby improving the convenience of assembly.

[0131] In addition, in the present application, as Figure 5 shown, the limiting flange 1311 is provided between the elastic deformation structure and the main body portion 141, and there is a preset gap m between the limiting flange 1311 and the end of the elastic deformation structure facing the main body portion 141, and the preset gap m is greater than or equal to 0.

[0132] When the preset gap m is 0, the limiting flange 1311 abuts against the end of the elastic deformation structure facing the main body portion 141, so as to realize the clamping and fixing of the clamping protrusion 131 and the elastic deformation structure in the thickness direction a of the spacer 12; when the preset gap m is greater than 0, the limiting flange 1311 is spaced from the end of the elastic deformation structure facing the main body portion 141. Among them, the preset gap m can specifically be 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc. By spacing the limiting flange 1311 from the end of the elastic deformation structure facing the main body portion 141, the adverse effects on assembly caused by factors such as manufacturing tolerances (such as incomplete assembly, etc.) are reduced, effectively meeting the assembly requirements.

[0133] In some embodiments of the present application, as Figure 5 shown, one end of the elastic deformation structure facing the main body portion 141 is spaced from the main body portion 141, the limiting flange 1311 is disposed between the elastic deformation structure and the main body portion 141, and the distance between the limiting flange 1311 and the main body portion 141 is greater than or equal to zero.

[0134] Specifically, the elastic deformation structure is disposed in the limiting hole 121 of the limiting protrusion 123. Along the axial direction of the limiting hole 121, one end of the elastic deformation structure facing the first end cap assembly 13 is connected to the hole wall of the limiting hole 121, and one end of the elastic deformation structure facing the main body portion 141 is spaced from the main body portion 141. When the engaging protrusion 131 having the limiting flange 1311 is disengaged from the through hole 1231 on the elastic deformation structure, the limiting flange 1311 is disposed in the space between the limiting hole 121 where the elastic deformation structure and the main body portion 141 are located, and the distance between the limiting flange 1311 and the main body portion 141 is greater than or equal to zero.

[0135] The space between one end of the elastic deformation structure facing the main body portion 141 and the main body portion 141 is used to accommodate the limiting flange 1311, and the distance between the limiting flange 1311 and the main body portion 141 is set to be greater than or equal to zero, thereby reducing the impact of the engaging protrusion 131 on the main body portion 141, and further improving the safety performance of the battery cell 10.

[0136] In some embodiments of the present application, as Figure 5 and Figure 8 shown, the limiting hole 121 includes a first hole section 1211 and a second hole section 1212. The first hole section 1211 and the second hole section 1212 are located on opposite sides of the elastic deformation structure, and the first hole section 1211 is disposed closer to the main body portion 141 than the second hole section 1212. Among them, the diameter of the first hole section 1211 is larger than the diameter of the second hole section 1212.

[0137] Specifically, the elastic deformation structure is in a cylindrical structure. Among them, the elastic deformation structure of the cylindrical structure is disposed in the limiting hole 121 of the limiting protrusion 123 and is coaxially arranged with the limiting hole 121. One end of the cylindrical structure facing the first end cap assembly 13 is connected to the hole wall of the limiting hole 121, and one end of the cylindrical structure facing the main body portion 141 is spaced from the port of the limiting hole 121 facing the main body portion 141. At the same time, one end of the cylindrical structure facing the main body portion 141 is spaced from the hole wall of the limiting hole 121.

[0138] The elastic deformation structure divides the through hole 1231 into two segments, namely the first hole segment 1211 and the second hole segment 1212. Among them, the first hole segment 1211 is located on the side of the elastic deformation structure facing the main body portion 141, and the second hole segment 1212 is located on the side of the elastic deformation structure facing the first end cover assembly 13. Moreover, the diameter of the first hole segment 1211 is set to be larger than the diameter of the second hole segment 1212.

[0139] When the first end cover assembly 13 is assembled with the spacer 12, the snap protrusion 131 is inserted in the direction from the second hole segment 1212 to the first hole segment 1211. The diameter of the first hole segment 1211 is set to be larger than the diameter of the second hole segment 1212, so that when the snap protrusion 131 passes through the elastic deformation structure, in the radial direction of the first hole segment 1211, the first hole segment 1211 provides a larger deformation space for the elastic deformation structure for the elastic deformation structure to undergo elastic deformation.

[0140] In addition, setting the diameter of the first hole segment 1211 to be larger than the diameter of the second hole segment 1212 can increase the wall thickness of the limiting protrusion 123 at the position of the second hole segment 1212, thereby improving the structural strength of the limiting protrusion 123, and further reducing the problems of deformation or fracture of the limiting protrusion 123 caused by impacts and other reasons.

[0141] In some embodiments of the present application, as Figure 5 and Figure 8 shown, there is an arc transition between the first hole segment 1211 and the elastic deformation structure.

[0142] Specifically, in the present application, the elastic deformation structure is configured as a cylindrical structure. The elastic deformation structure in the form of a cylindrical structure includes an axial first end and a second end. Among them, the first end faces the first end cover assembly 13 and is connected to the hole wall of the limiting hole 121, and the second end faces away from the first end cover assembly 13 and is not connected to the hole wall of the limiting hole 121 and is spaced from the hole wall of the limiting hole 121. The second end of the side wall of the cylindrical structure is inclined in the direction from the hole wall of the limiting hole 121 to the central axis of the limiting hole 121, so that the distance between the second end and the hole wall of the limiting hole 121 is set to be greater than the distance between the first end and the hole wall of the limiting hole 121, thereby making the cylindrical structure form a frustum-shaped structure (the first end is the small end and the second end is the large end).

[0143] The first end is connected to the hole wall of the limiting hole 121. The included angle between the outer peripheral surface of the elastic deformation structure and the first hole section 1211 is an acute angle, and the included angle between the outer peripheral surface of the elastic deformation structure and the second hole section 1212 is an obtuse angle. When the clamping protrusion 131 with the limiting flange 1311 passes through the through hole 1231 on the elastic deformation structure, the elastic deformation structure elastically deforms in the first hole section 1211 in the direction close to the hole wall of the limiting hole 121 to allow the clamping protrusion 131 with the limiting flange 1311 to pass through.

[0144] An arc transition is provided at the connection position between the elastic deformation structure and the first hole section 1211. By providing an arc transition between the first hole section 1211 and the elastic deformation structure, the stress concentration at the connection position between the elastic deformation structure and the first hole section 1211 is reduced, and further the problem of the elastic deformation structure breaking due to stress concentration is reduced.

[0145] It should be noted that the radius of the arc transition between the first hole section 1211 and the elastic deformation structure can be set accordingly as needed. Regarding the specific value, it will not be elaborated in this application.

[0146] In some embodiments of the present application, such as Figure 5 , Figure 10 , Figure 11 and Figure 12 shown, the clamping protrusion 131 includes a limiting flange 1311. The limiting flange 1311 is clamped on the side of the elastic deformation structure facing the main body part 141, and the limiting flange 1311 is completely accommodated in the first hole section 1211.

[0147] Specifically, in the present application, the elastic deformation structure is configured as a cylindrical structure. The axial direction of the cylindrical structure includes a first end and a second end. The elastic deformation structure in the form of a cylindrical structure is coaxially arranged in the limiting hole 121 of the limiting protrusion 123. The first end of the cylindrical structure faces the first end cover assembly 13 and is connected to the hole wall of the limiting hole 121. The second end of the cylindrical structure faces the main body part 141 and is spaced from the port of the limiting hole 121 facing the main body part 141. At the same time, the second end of the cylindrical structure is spaced from the hole wall of the limiting hole 121. The elastic deformation structure divides the through hole 1231 into a first hole section 1211 and a second hole section 1212. Among them, the first hole section 1211 is located on the side of the elastic deformation structure facing the main body part 141, and the second hole section 1212 is located on the side of the elastic deformation structure facing the first end cover assembly 13.

[0148] The clamping protrusion 131 includes a limiting flange 1311. The limiting flange 1311 is spaced from the first end cover assembly 13, and the maximum diameter of the limiting flange 1311 is greater than the minimum diameter of the through hole 1231.

[0149] When the first end cover assembly 13 is assembled, the limiting flange 1311 is inserted into the limiting hole 121 and moves along the limiting hole 121 toward the elastic deformation structure. When the limiting flange 1311 is inserted into the penetration hole 1231, as the limiting flange 1311 is continuously inserted, when the limiting flange 1311 passes through a position with a small diameter (a position where the diameter of the limiting flange 1311 is larger than the diameter of the penetration hole 1231), the limiting flange 1311 squeezes the hole wall of the penetration hole 1231. Driven by the squeezing force, the elastic deformation structure undergoes elastic deformation (deformation). The variable gap 1232 is enlarged), so that the through hole 1231 is stretched and the diameter is increased to meet the passing requirement of the limiting flange 1311. When the limiting flange 1311 is out of the through hole 1231, the elastic deformation structure is reset, and the stretched through hole 1231 is restored to its original diameter. The diameter of the reset through hole 1231 cannot allow the limiting flange 1311 to pass through in the reverse direction from the main body 141 to the first end cover assembly 13, so that the limiting flange 1311 is limited in the first hole section 1211 between the elastic deformation structure and the main body 141.

[0150] When the first end cover assembly 13 and the isolation member 12 are assembled in place, the limiting flange 1311 is clamped on the side of the elastic deformation structure facing the main body 141 and is received by the first hole section 1211, thereby reducing the situation where the limiting flange 1311 protrudes out of the limiting hole 121, and further reducing the situation where the limiting flange 1311 protrudes out of the limiting hole 121 and the adverse effect on the main body 141.

[0151] In some embodiments of the present application, Figure 5 and Figure 8 As shown, the through hole 1231 includes a straight hole section 12311 and a transition hole section 12312, the straight hole section 12311 and the transition hole section 12312 are connected, and the straight hole section 12311 is arranged farther away from the first end cover assembly 13 than the transition hole section 12312, one end of the transition hole section 12312 is connected to the straight hole section 12311, and the other end of the transition hole section 12312 is connected to the second hole section 1212, and the size of the transition hole section 12312 tends to decrease along the direction from the first end cover assembly 13 to the main body 141.

[0152] Specifically, in the direction from the first end cover assembly 13 to the main body 141, the size of the transition hole section 12312 in the first direction b tends to decrease, that is, the transition hole section 12312 is narrowed, wherein the narrowing setting can be a continuous structure or an intermittent structure.

[0153] In this application, the transition hole section 12312 and the straight hole section 12311 are connected in sequence. The transition hole section 12312 faces the first end cap assembly 13, and the straight hole section 12311 faces away from the first end cap assembly 13. In the thickness direction a of the spacer 12, the transition hole section 12312 includes a large end and a small end. Among them, the large end faces the first end cap assembly 13, the small end faces away from the first end cap assembly 13 and is connected to the straight hole section 12311, and the diameter of the small end is equal to the diameter of the straight hole section 12311.

[0154] During assembly, when the snap projection 131 is inserted into the through hole 1231, it first passes through the transition hole, then enters the straight hole section 12311, and finally the limiting flange 1311 of the snap projection 131 exits through the straight hole section 12311. By providing the transition hole section 12312, the guiding of the insertion process of the snap projection 131 is realized, the convenience of assembly is improved, and the assembly efficiency is effectively enhanced.

[0155] In some embodiments of this application, as Figure 5 、 Figure 10 、 Figure 11 and Figure 12 shown, the snap projection 131 further includes a connecting column 1312. The limiting flange 1311 is connected to the first end cap assembly 13 through the connecting column 1312, and at least a part of the connecting column 1312 is received in the through hole 1231.

[0156] Specifically, one end of the connecting column 1312 is connected to the limiting flange 1311, and the other end of the connecting column 1312 is connected to the first end cap assembly 13. Among them, the connecting column 1312 is perpendicular or disposed at an acute angle to the first end cap assembly 13.

[0157] When the first end cover assembly 13 is assembled, the end of the connecting column 1312 provided with the limiting flange 1311 is inserted into the limiting hole 121 and moves along the limiting hole 121 in the direction close to the elastic deformation structure. When the limiting flange 1311 is inserted into the through hole 1231, as the limiting flange 1311 is continuously inserted, when the limiting flange 1311 passes through the position with a smaller diameter (the position where the diameter of the limiting flange 1311 is greater than the diameter of the through hole 1231), the limiting flange 1311 squeezes the hole wall of the through hole 1231. Driven by the squeezing force, the elastic deformation structure undergoes elastic deformation (the deformation gap 1232 increases), so that the through hole 1231 is expanded and its diameter is increased to meet the passing requirement of the limiting flange 1311. When the limiting flange 1311 exits from the through hole 1231, the elastic deformation structure resets, and the expanded through hole 1231 returns to its original diameter. The diameter of the reset through hole 1231 cannot allow the limiting flange 1311 to pass in the reverse direction from the main body 141 to the first end cover assembly 13, so that the limiting flange 1311 is limited in the first hole section 1211 between the elastic deformation structure and the main body 141, and at least part of the body of the connecting column 1312 is received in the through hole 1231.

[0158] The connecting column 1312 is provided so that the limiting flange 1311 and the first end cover assembly 13 are spaced apart, so that the limiting flange 1311 can be effectively inserted into the through hole 1231 of the elastic deformation structure and exit from the through hole 1231, thereby realizing the snap - fit between the snap - protrusion 131 and the elastic deformation structure.

[0159] It should be noted that the limiting flange 1311 and the connecting column 1312 can be integrally formed, or the limiting flange 1311 and the connecting column 1312 are of a split - type structure and are connected and fixed by welding, bonding or other means.

[0160] In some embodiments of the present application, as Figure 5 、 Figure 10 、 Figure 11 and Figure 12 shown, the connecting column 1312 includes a first connecting portion 13121. The first connecting portion 13121 is connected to the limiting flange 1311. The dimension of the first connecting portion 13121 along the first direction b is less than or equal to the dimension of the straight hole section 12311 along the first direction b. The dimension of the limiting flange 1311 along the first direction b is greater than the dimension of the straight hole section 12311 along the first direction b. The first direction b is perpendicular to the thickness direction a of the spacer 12.

[0161] Specifically, when the limiting flange 1311 exits from the elastic deformation structure, the limiting flange 1311 is arranged on the side of the elastic deformation structure facing the main body 141, and the first connecting portion 13121 is arranged in the through hole 1231.

[0162] By setting the dimensions of the first connecting portion 13121 and the limiting flange 1311 in the first direction b, the elastic deformation structure can be elastically deformed when the limiting flange 1311 passes through the straight hole section 12311, and can restore the elastic deformation when the limiting flange 1311 is released, and the limiting flange 1311 is limited by the elastic deformation structure that restores the elastic deformation, thereby reducing the situation where the limiting flange 1311 falls off in the reverse direction (from the main body 141 to the first end cover assembly 13), thereby improving the structural stability of the connection position.

[0163] In some embodiments of the present application, along the first direction b, a size of the first connection portion 13121 is greater than or equal to 0.8 mm and less than or equal to 3 mm.

[0164] Specifically, the connecting column 1312 includes a first connecting portion 13121, which is connected to the limiting flange 1311. Along the first direction b, the size of the first connecting portion 13121 is greater than or equal to 0.8 mm and less than or equal to 3 mm, the minimum diameter of the limiting hole 121 is greater than or equal to the size of the first connecting portion 13121, and the difference between the maximum size of the limiting flange 1311 and the minimum diameter of the limiting hole 121 is greater than zero and less than or equal to 0.2 mm.

[0165] The first connecting portion 13121 is a first cylindrical structure, which has two oppositely arranged ends, one end of which is connected to the first end cover assembly 13, and the other end is arranged away from the first end cover assembly 13 and connected to the limiting flange 1311, wherein the diameter of the first connecting portion 13121 is the first diameter d1, the maximum diameter of the limiting flange 1311 is the second diameter d2, the minimum diameter of the limiting hole 121 is the third diameter d3, 0.8 mm ≤ first diameter d1 ≤ 3 mm, the first diameter d1 ≤ third diameter d3, and at the same time, the difference between the second diameter d2 and the third diameter d3 is ≥ 0.2 mm.

[0166] When the first end cover assembly 13 is assembled, the end of the clamping protrusion 131 with the limiting flange 1311 is arranged facing the limiting hole 121, so that the end of the clamping protrusion 131 with the limiting flange 1311 is inserted into the limiting hole 121 and the first end cover assembly 13 is pushed along the thickness direction a of the isolation member 12 by using external force, and the clamping protrusion 131 moves relative to the limiting hole 121. During the movement, when the limiting flange 1311 passes through the position of the minimum diameter of the limiting hole 121, due to The limiting flange 1311 squeezes the inner wall of the limiting hole 121, and the deformation gap 1232 increases to increase the aperture of the limiting hole 121 to meet the penetration requirement of the limiting flange 1311. When installed in place, the limiting flange 1311 escapes from the limiting hole 121 and is arranged on the side of the limiting protrusion 123 away from the first end cover assembly 13. The deformation gap 1232 restores its elastic deformation and cannot meet the passage of the limiting flange 1311. The first connecting portion 13121 is penetrated in the limiting hole 121.

[0167] The limiting flange 1311 is connected to the first end cover assembly 13 through the first connecting portion 13121, so that the limiting flange 1311 and the first end cover assembly 13 are spaced apart in the thickness direction a of the isolation member 12, and by setting the size of the first connecting portion 13121, the minimum diameter of the limiting hole 121 and the diameter of the first connecting portion 13121, the limiting flange 1311 can effectively cooperate with the limiting hole 121, thereby realizing effective assembly of the first end cover assembly 13.

[0168] It should be understood that, when the difference between the second diameter d2 and the third diameter d3 is larger, the extrusion force formed by the limiting flange 1311 on the inner wall of the limiting hole 121 when passing through the limiting hole 121 is larger, so that the elastic deformation of the deformation gap 1232 is larger. The specific value of the difference between the second diameter d2 and the third diameter d3 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm.

[0169] In addition, the first diameter d1 of the first connection portion 13121 is set between 0.8 mm and 3 mm, so that the volume of the first connection portion 13121 can be effectively controlled, reducing the occupation of the internal space of the shell 11 by the first connection portion 13121, thereby effectively improving the space utilization rate inside the shell 11.

[0170] Among them, the specific values of the first diameter d1 can be 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm.

[0171] In addition, by setting the size of the first connecting portion 13121 in the first direction b, the structural strength of the first connecting portion 13121 can be improved, and the situation of the first connecting portion 13121 breaking due to force is reduced.

[0172] In some embodiments of the present application, such as Figure 5 , Figure 10 , Figure 11 and Figure 12 shown, the connecting column 1312 further includes a transition connecting portion 13122. The first connecting portion 13121 is connected to the first end cap assembly 13 through the transition connecting portion 13122. At least a part of the transition connecting portion 13122 is disposed in the transition hole section 12312. In the direction from the first end cap assembly 13 to the main body portion 141, the size of the transition connecting portion 13122 in the first direction b shows a decreasing trend.

[0173] Specifically, in the present application, in the direction from the first end cap assembly 13 to the main body portion 141, the fact that the size of the transition connecting portion 13122 in the first direction b shows a decreasing trend means that in the direction from the first end cap 134 to the main body portion 141, the size of the transition connecting portion 13122 in the first direction b is set to decrease, that is, in the direction from the first end cap assembly 13 to the main body portion 141, the transition connecting portion 13122 is set to be narrowed. Among them, the narrowed setting can be a continuous structure or an intermittent structure.

[0174] In the present application, the transition connecting portion 13122 and the first connecting portion 13121 are connected in sequence. In the thickness direction a of the separator 12, the transition connecting portion 13122 includes a large end and a small end. Among them, the large end is connected to the first end cap assembly 13, the small end is disposed away from the first end cap assembly 13 and is connected to the first connecting portion 13121, and the diameter of the small end is equal to the diameter of the first connecting portion 13121.

[0175] By providing the transition connecting portion 13122, the structural strength of the clamping protrusion 131 can be increased, and the situation of the clamping protrusion 131 breaking during the assembly process is further reduced.

[0176] In some embodiments of the present application, such as Figure 5 , Figure 10 , Figure 11 and Figure 12As shown, the connecting column 1312 also includes a second connecting portion 13123 , the transition connecting portion 13122 is connected to the first end cover assembly 13 via the second connecting portion 13123 , and the second connecting portion 13123 is accommodated in the second hole section 1212 .

[0177] Specifically, in the direction from the first end cover assembly 13 to the main body 141, the size of the transition connection portion 13122 along the first direction b tends to decrease, the end of the transition connection portion 13122 facing the first end cover assembly 13 is the large end, and the end of the transition connection portion 13122 facing the main body 141 is the small end, and the first connection portion 13121 and the second connection portion 13123 are respectively connected to the opposite ends of the transition connection portion 13122, wherein the first connection portion 13121 is connected to the small end of the transition connection portion 13122 and is consistent with the diameter of the small end, and the second connection portion 13123 is connected to the large end of the transition connection portion 13122 and is consistent with the diameter of the large end.

[0178] When the first end cover assembly 13 is assembled, the snap-fit protrusion 131 is arranged facing the limiting hole 121, so that one end of the snap-fit protrusion 131 having the limiting flange 1311 is inserted into the second straight hole section 12311 of the limiting hole 121, and the first end cover assembly 13 is pushed by the thickness direction a of the external force isolation member 12, and the snap-fit protrusion 131 moves relative to the limiting hole 121. During the movement, when the limiting flange 1311 passes through the position of the minimum diameter of the limiting hole 121, the limiting flange 1311 squeezes the limiting hole 121, and the deformation gap 1232 becomes smaller and the aperture of the limiting hole 121 increases to meet the penetration requirement of the limiting flange 1311.

[0179] When the snap-fitting protrusion 131 and the limiting protrusion 123 are assembled in place, the limiting flange 1311 comes out through the limiting hole 121 and abuts against the side of the limiting flange 1311 away from the first end cover assembly 13, and the deformation gap 1232 restores elastic deformation and limits the limiting flange 1311 from coming out in the opposite direction (from the main body 141 to the first end cover 134), the first connecting portion 13121 is inserted in the straight hole section 12311, the through hole 122 connecting portion is inserted in the transition hole section 12312, and the second connecting portion 13123 is inserted in the second straight hole section 12311.

[0180] The limiting flange 1311 is engaged with the side of the elastic deformation structure facing the main body 141 to limit the first end cover assembly 13 in the thickness direction a of the isolation member 12. At the same time, the second straight hole section 12311 is engaged with the second connecting portion 13123, so that the first end cover assembly 13 can be limited in the first direction b, reducing the movement of the clamping protrusion 131 relative to the isolation member 12 in the first direction b, and further improving the assembly accuracy of the first end cover assembly 13.

[0181] In some embodiments of the present application, such as Figure 8 and Figure 12 shown, there is a first included angle a1 between the hole wall of the transition hole section 12312 and the central axis of the through hole 1231, and a second included angle a2 between the outer peripheral surface of the transition connection part 13122 and the central axis of the connection column 1312. The first included angle a1 is less than or equal to the second included angle a2. Wherein, the direction of the central axis of the through hole 1231 is the same as the direction of the central axis of the connection column 1312.

[0182] Specifically, when the first included angle a1 is less than the second included angle a2, the outer peripheral surface of the transition connection part 13122 is spaced from the hole wall of the transition hole section 12312. When the first included angle a1 is equal to the second included angle a2, the outer peripheral surface of the transition connection part 13122 is in contact with the hole wall of the transition hole section 12312.

[0183] By setting the transition hole section 12312 and the transition connection part 13122, the transition connection part 13122 can effectively adapt to the shape of the transition hole section 12312, reducing the influence of factors such as manufacturing tolerances on assembly, and enabling the assembly operation to be effectively carried out.

[0184] It should be noted that in the present application, the transition hole section 12312 has a first frustum structure. By setting the transition hole section 12312 as the first frustum structure, the inner wall structure of the transition hole section 12312 can be made more continuous, and further, when the limiting flange 1311 of the clamping projection 131 moves along the inner wall of the transition hole section 12312, it can move more smoothly, reducing the problem of assembly difficulties caused by jamming.

[0185] In addition, the transition connection part 13122 has a second frustum structure. By setting the transition connection part 13122 as the second frustum structure, the structure of the transition connection part 13122 can be made more continuous, making the processing more convenient and effectively improving the processing efficiency.

[0186] In some embodiments of the present application, the first included angle a1 is greater than or equal to 20 degrees and less than or equal to 75 degrees.

[0187] Specifically, by setting the first included angle a1, while meeting the requirement of guiding the clamping projection 131, the processing convenience is improved.

[0188] It should be noted that the specific value of the first included angle a1 can be 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees.

[0189] In some embodiments of the present application, the second included angle is greater than or equal to 20 degrees and less than or equal to 75 degrees.

[0190] Specifically, by setting the second angle a2, the transition connection portion 13122 can effectively adapt to the structure of the transition hole section 12312, so that the assembly can be carried out effectively.

[0191] It should be pointed out that the specific value of the second angle a2 can be 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, or 75 degrees.

[0192] In some embodiments of the present application, Figure 5 , Figure 10 , Figure 11 and Figure 12 As shown, along the thickness direction a of the isolation plate 124, the limiting flange 1311 shows a decreasing trend.

[0193] Specifically, along the thickness direction a of the isolation plate 124, the limiting flange 1311 shows a decreasing trend, which means that in the direction from the first end cover assembly 13 to the main body 141, the size of the transition hole section 12312 in the first direction b shows a decreasing trend, that is, the transition hole section 12312 is narrowed, wherein the narrowing setting can be a continuous structure or an intermittent structure.

[0194] In the present application, the limiting flange 1311 is arranged so that the side of the limiting flange 1311 away from the first end cover assembly 13 is narrowed, thereby facilitating the insertion of the limiting flange 1311 into the limiting hole 121, thereby improving the convenience of assembly.

[0195] It should be pointed out that in the present application, the maximum diameter of the limiting flange 1311 is larger than the diameter of the straight hole section 12311 of the penetration hole 1231, so that when the limiting flange 1311 passes through the limiting hole 121, the limiting hole 121 is driven by the limiting flange 1311, so that the elastic deformation structure is elastically deformed in the direction close to the hole wall of the limiting hole 121 (the deformation gap 1232 increases) so that the limiting flange 1311 can escape through the limiting hole 121.

[0196] In addition, in the present application, the structure of the limiting flange 1311 is in the shape of a cone or a mushroom head. The shape of the limiting flange 1311 is set to improve the convenience of processing.

[0197] In some embodiments of the present application, Figures 5 to 9 As shown, there are multiple deformation gaps 1232 , and the multiple deformation gaps 1232 are arranged at intervals along the circumferential direction of the limiting hole 121 .

[0198] Specifically, by providing a plurality of deformation gaps 1232, the elastic deformation ability of the elastic deformation structure is improved, and further, the convenience of inserting the engaging protrusion 131 with the limiting flange 1311 into the limiting hole 121 is improved, so that the assembly efficiency is effectively enhanced.

[0199] It should be noted that the plurality of deformation gaps 1232 can be arranged at equal intervals or unequal intervals in the circumferential direction of the card hole.

[0200] In some embodiments of the present application, the deformation gap 1232 has a linear structure or a curved structure.

[0201] Specifically, by setting the shape of the deformation gap 1232, the deformation gap 1232 can be set according to requirements, thereby meeting the production requirements.

[0202] In some embodiments of the present application, along the circumferential direction of the limiting hole 121, the size of the deformation gap 1232 is greater than or equal to 0.3 mm and less than or equal to 1.5 mm.

[0203] Specifically, by setting the size of the deformation gap 1232 in the circumferential direction of the limiting hole 121, the limiting hole 121 has sufficient structural strength while having elastic deformation performance, reducing the occurrence of the engaging protrusion 131 falling off.

[0204] It should be noted that in the present application, as Figure 6 shown, along the circumferential direction of the limiting hole 121, the size of the deformation gap 1232 is the width dimension p of the deformation gap 1232, and the value of the width dimension p can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm.

[0205] In some embodiments of the present application, as Figure 6 , Figure 7 and Figure 9 shown, the spacer 12 further includes a partition plate 124, and the limiting protrusion 123 protrudes on the side of the spacer 12 facing the first end cap assembly 13.

[0206] Specifically, the spacer 12 is arranged between the first end cap assembly 13 and the main body portion 141 of the electrode assembly 14. The partition plate 124 of the spacer 12 is arranged between the first end cap assembly 13 and the main body portion 141, and the partition plate 124 is used to block the first end cap assembly 13 and the main body portion 141, thereby improving the blocking performance.

[0207] In addition, the limiting protrusion 123 is protrudingly provided on the side of the separator 12 facing the first end cap assembly 13, reducing the situation where there is a protruding structure on the side of the separator 12 facing the main body portion 141, thereby reducing the occurrence of the main body portion 141 being punctured due to the protruding structure on the separator 12, and effectively improving the safety performance of the battery cell 10.

[0208] It should be noted that the limiting protrusion 123 can be integrally formed with the separator plate 124, or can be a split structure and fixed to the separator plate 124 by means such as bonding or welding.

[0209] In some embodiments of the present application, such as Figure 5 、 Figure 6 and Figure 9 as shown, the separator 12 further includes a side plate 125. The side plate 125 surrounds the circumferential direction of the separator plate 124 and is connected to the separator plate 124. One end of the side plate 125 facing the main body portion 141 is flush with one end of the separator plate 124 facing the main body portion 141.

[0210] Specifically, the side plate 125 can be formed into a ring shape, for example, a circular ring shape, a rectangular shape or other irregular shapes. The embodiments of the present application include but are not limited to this.

[0211] The side plate 125 surrounds the outside of the separator plate 124 and protrudes from the side of the separator plate 124 facing away from the main body portion 141. In this way, the separator plate 124 and the side plate 125 can jointly define a receiving recess, and the receiving recess can receive at least a part of the tab 142 to improve the structural compactness.

[0212] In some embodiments of the present application, such as Figure 6 and Figure 9 as shown, the separator 12 further includes a reinforcing structure 126. The reinforcing structure 126 is respectively connected to the separator plate, the limiting protrusion 123 and the side plate 125.

[0213] Specifically, by providing the reinforcing structure 126, the connection strength between the limiting protrusion 123 and the separator plate 124 is improved, and the situation where the limiting protrusion 123 breaks relative to the separator plate 124 is reduced.

[0214] It should be noted that the reinforcing structure 126 can be in a long strip shape, for example, a straight long strip shape.

[0215] In some embodiments of the present application, such as Figure 6 and Figure 9 as shown, the number of the reinforcing structures 126 is multiple, and the multiple reinforcing structures 126 are arranged at intervals along the circumferential direction of the limiting protrusion 123.

[0216] Specifically, a plurality of reinforcing structures 126 are provided, which further improve the structural strength of the limiting protrusion 123 and further reduce the occurrence of fracture of the limiting protrusion 123 relative to the partition plate 124.

[0217] In some embodiments of the present application, as Figures 10 to 12 shown, the first end cap assembly 13 further includes a first end cap 134 and an insulating member 135. The first electrode lead-out member 17 is provided on the first end cap 134. The insulating member 135 includes an insulating body and a clamping protrusion 131. The insulating body is provided on the side of the first end cap 134 facing the main body portion 141, and the clamping protrusion 131 is fixed to the side of the insulating body facing the main body portion 141.

[0218] Specifically, the clamping protrusion 131 is connected to the insulating member 135. Among them, the clamping protrusion 131 and the insulating member 135 can be vertically connected or can be connected at an acute angle. In addition, the clamping protrusion 131 and the insulating member 135 can be of an integral structure or a split structure and are connected by welding or bonding.

[0219] The first end cap 134 is connected to the insulating member 135, and the connection method between the two includes but is not limited to clamping, bonding or connection through a connecting member. The insulating member 135 is used to isolate the first cover plate and the electrode assembly 14.

[0220] The first electrode lead-out member 17 is provided on the first cover plate, and the tab 142 of the electrode assembly 14 passes through the through-hole 1231 of the separator 12 and is connected to the first electrode lead-out member 17.

[0221] The first cover plate can be made of metal and can conduct electricity, and the insulating member 135 can be a plastic product.

[0222] In the present application, the first end cap assembly 13 is arranged. On the basis of realizing the connection and fixation of the first end cap assembly 13 and the separator 12, the first cover plate is effectively insulated, so that the insulation performance of the battery cell 10 can be further improved.

[0223] In some embodiments of the present application, the housing 11 further has a second opening opposite to the first opening, and the battery cell 10 further includes a second end cap assembly 15. The second end cap assembly 15 is used to cover the second opening.

[0224] Specifically, the first end cap assembly 13 and the second end cap assembly 15 are respectively used to cover the first opening and the second opening at both ends of the housing 11, so as to facilitate the sealing of the housing 11.

[0225] Optionally, the second end cap assembly 15 is not provided with an electrode terminal, only the first end cap assembly 13 is provided with an electrode terminal, and the electrode assembly 14 enters the housing 11 through the second opening.

[0226] Optionally, the second end cap assembly 15 is provided with an electrode terminal, which is electrically connected to the tab 142 near the second opening. Among them, the second end cap assembly 15 may have the same structure as the first end cap assembly 13, that is, the second end cap assembly 15 is provided with the same structure as the clamping protrusion 131, or the second end cap assembly 15 may have a different structure from the first end cap assembly 13.

[0227] The battery cell 10 may further include an insulating film 16, which is disposed on the outer surface of the electrode assembly 14 and can be used to isolate the electrode assembly 14 and the housing 11.

[0228] In addition, as Figure 10 shown, the first end cap assembly 13 is provided with a liquid injection hole 132, and the liquid injection hole 132 is communicated with the inside of the housing 11 to supply electrolyte to be injected into the inside of the housing 11. By providing the liquid injection hole 132 on the first end cap assembly 13, the electrolyte can be injected into the housing 11 through the liquid injection hole 132, thereby improving the convenience of electrolyte injection.

[0229] In addition, as Figure 10 shown, a baffle 133 is provided on the first end cap assembly 13. The baffle 133 is disposed on the side of the first end cap assembly 13 facing the support member and is disposed opposite to the liquid injection hole 132. The baffle 133 is used to block the liquid injection hole 132 to reduce foreign objects from entering the inside of the battery cell 10 through the liquid injection hole 132.

[0230] A second aspect of the present application provides a battery 100, which includes the battery cell 10 as described above.

[0231] When assembling the battery cell 10 in the battery 100, the separator 12 is disposed in the housing 11, and then the clamping protrusion 131 of the first end cap assembly 13 is inserted into the limiting hole 121 of the limiting protrusion 123. As the clamping protrusion 131 is gradually inserted, the clamping protrusion 131 enters the through hole 1231 of the elastic deformation structure. When the clamping protrusion 131 passes through the through hole 1231, the elastic deformation structure undergoes elastic deformation so that the clamping protrusion 131 can be clamped and matched with the elastic deformation structure. By providing the elastic deformation structure on the separator 12, it is possible to meet the assembly requirements without providing a deformation structure on the clamping protrusion 131, thereby improving the structural strength of the clamping protrusion 131 and reducing the occurrence of fracture of the clamping protrusion 131 during the assembly process.

[0232] A third aspect of the present application provides an electrical device, which includes the battery 100 as described above.

[0233] In an electrical device, when assembling the battery cells 10 in the battery 100, the separator 12 is disposed within the housing 11. Then, the engaging protrusion 131 of the first end cap assembly 13 is inserted into the limiting hole 121 of the limiting protrusion 123. As the engaging protrusion 131 is gradually inserted, the engaging protrusion 131 enters the through hole 1231 of the elastic deformation structure. When the engaging protrusion 131 passes through the through hole 1231, the elastic deformation structure undergoes elastic deformation so that the engaging protrusion 131 can be engaged and cooperate with the elastic deformation structure. By providing the elastic deformation structure on the separator 12, it is possible to meet the assembly requirements without providing a deformation structure on the engaging protrusion 131, thereby improving the structural strength of the engaging protrusion 131 and reducing the occurrence of fracture of the engaging protrusion 131 during the assembly process.

[0234] The above description is only an overview of the technical solution of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other objects, features, and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application.

[0235] In an embodiment of the present application, as Figures 3 to 12 shown, the present application provides a battery cell 10 including a housing 11, a first end cap assembly 13, an electrode assembly 14, and a separator 12. The housing 11 includes a first opening. The first end cap assembly 13 is used to cover the first opening. The first end cap assembly 13 includes an engaging protrusion 131 and a first electrode lead-out member 17. The electrode assembly 14 is accommodated within the housing 11. The electrode assembly 14 includes a main body portion 141 and a tab 142 extending from the main body portion 141. At least a part of the separator 12 is disposed between the first electrode lead-out member 17 and the main body portion 141. The tab 142 passes through the separator 12 and is electrically connected to the first electrode lead-out member 17. The separator 12 includes a limiting protrusion 123. A limiting hole 121 is formed on the limiting protrusion 123. The limiting hole 121 is opened along the thickness direction a of the separator 12. An elastic deformation structure is provided on the hole wall of the limiting hole 121. The engaging protrusion 131 is engaged and cooperates with the elastic deformation structure. Among them, the elastic deformation structure includes a through hole 1231. The through hole 1231 communicates with the limiting hole 121. The elastic deformation structure is configured to be capable of undergoing elastic deformation when the engaging protrusion 131 is inserted into the limiting hole 121 and passes through the through hole 1231.

[0236] Specifically, the elastic deformation structure is a cylindrical structure. The interior of the cylindrical structure forms a through hole 1231. A deformation gap 1232 is formed on the cylindrical structure. There is a gap between the outer peripheral surface of the elastic deformation structure and the hole wall of the limit hole 121. The gap between the outer peripheral surface of the elastic deformation structure and the hole wall of the limit hole 121 shows an increasing trend in the direction from the first end cap assembly 13 to the main body part 141. The cylindrical structure extends obliquely in the direction from the first end cap assembly 13 to the main body part 141. The clamping protrusion 131 includes a limit flange 1311. The cylindrical structure is configured such that when the limit flange 1311 passes through the through hole 1231, the size of the deformation gap 1232 expands and the diameter of the through hole 1231 increases, and after the limit flange 1311 disengages from the through hole 1231, the deformation gap 1232 resets and the diameter of the through hole 1231 resets, and the limit flange 1311 is clamped to the side of the elastic deformation structure facing the main body part 141. One end of the elastic deformation structure facing the main body part 141 is spaced apart from the main body part 141. The limit flange 1311 is disposed between the elastic deformation structure and the main body part 141, and the distance between the limit flange 1311 and the main body part 141 is greater than or equal to zero. The limit hole 121 includes a first hole section 1211 and a second hole section 1212. The first hole section 1211 and the second hole section 1212 are located on opposite sides of the elastic deformation structure, and the first hole section 1211 is closer to the main body part 141 than the second hole section 1212. Among them, the diameter of the first hole section 1211 is larger than the diameter of the second hole section 1212. There is an arc transition between the first hole section 1211 and the elastic deformation structure. The clamping protrusion 131 includes a limit flange 1311. The limit flange 1311 is clamped to the side of the elastic deformation structure facing the main body part 141, and the limit flange 1311 is completely accommodated in the first hole section 1211. The through hole 1231 includes a straight hole section 12311 and a transition hole section 12312. The straight hole section 12311 and the transition hole section 12312 are connected, and the straight hole section 12311 is farther from the first end cap assembly 13 than the transition hole section 12312. One end of the transition hole section 12312 is connected to the straight hole section 12311, and the other end of the transition hole section 12312 is connected to the second hole section 1212. Along the direction from the first end cap assembly 13 to the main body part 141, the size of the transition hole section 12312 shows a decreasing trend. The limit flange 1311 is connected to the first end cap assembly 13 through a connecting column 1312. At least a part of the connecting column 1312 is received in the through hole 1231. The connecting column 1312 includes a first connecting part 13121. The first connecting part 13121 is connected to the limit flange 1311. The dimension of the first connecting part 13121 along the first direction b is less than or equal to the dimension of the straight hole section 12311 along the first direction b. The dimension of the limit flange 1311 along the first direction b is larger than the dimension of the straight hole section 12311 along the first direction b. The first direction b is perpendicular to the thickness direction a of the spacer 12. Along the first direction b, the dimension of the first connecting part 13121 is greater than or equal to 0.8 mm and less than or equal to 3 mm.The connecting column 1312 further includes a transition connecting portion 13122. The first connecting portion 13121 is connected to the first end cover assembly 13 through the transition connecting portion 13122. At least a part of the transition connecting portion 13122 is disposed in the transition hole section 12312. In the direction from the first end cover assembly 13 to the main body portion 141, the dimension of the transition connecting portion 13122 in the first direction b shows a decreasing trend. The connecting column 1312 further includes a second connecting portion 13123. The transition connecting portion 13122 is connected to the first end cover assembly 13 through the second connecting portion 13123. The second connecting portion 13123 is received in the second hole section 1212. There is a first included angle a1 between the hole wall of the transition hole section 12312 and the central axis of the through hole 1231. There is a second included angle a2 between the outer peripheral surface of the transition connecting portion 13122 and the central axis of the connecting column 1312. The first included angle a1 is less than or equal to the second included angle a2. Wherein, the direction of the central axis of the through hole 1231 is the same as the direction of the central axis of the connecting column 1312. The first included angle a1 is greater than or equal to 20 degrees and less than or equal to 75 degrees. The second included angle is greater than or equal to 20 degrees and less than or equal to 75 degrees. Along the thickness direction a of the partition plate 124, the surface of the limiting flange 1311 shows a decreasing trend. The number of the deformation gaps 1232 is multiple. The multiple deformation gaps 1232 are arranged at intervals along the circumferential direction of the limiting hole 121. The deformation gaps 1232 are in a linear structure or a curved structure. Along the circumferential direction of the limiting hole 121, the dimension of the deformation gaps 1232 is greater than or equal to 0.3 mm and less than or equal to 1.5 mm. The spacer 12 further includes a partition plate 124. The limiting protrusion 123 protrudes on the side of the spacer 12 facing the first end cover assembly 13. The spacer 12 further includes a side plate 125. The side plate 125 surrounds the partition plate 124 in the circumferential direction and is connected to the partition plate 124. One end of the side plate 125 facing the main body portion 141 is flush with one end of the partition plate 124 facing the main body portion 141. The spacer 12 further includes a strengthening structure 126. The strengthening structure 126 is respectively connected to the partition plate, the limiting protrusion 123 and the side plate 125. The number of the strengthening structures 126 is multiple. The multiple strengthening structures 126 are arranged at intervals along the circumferential direction of the limiting protrusion 123. The first end cover assembly 13 further includes a first end cover 134 and an insulating member 135. The first electrode lead-out member 17 is disposed on the first end cover 134. The insulating member 135 includes an insulating body and a clamping protrusion 131. The insulating body is disposed on the side of the first end cover 134 facing the main body portion 141. The clamping protrusion 131 is fixed on the side of the insulating body facing the main body portion 141. The housing 11 further has a second opening opposite to the first opening. The battery cell 10 further includes a second end cover assembly 15. The second end cover assembly 15 is used to cover the second opening.

[0237] Specifically, during assembly, the spacer 12 is disposed within the housing 11. Then, the clamping protrusion 131 of the first end cap assembly 13 is inserted into the limiting hole 121 of the limiting protrusion 123. As the clamping protrusion 131 is gradually inserted, the clamping protrusion 131 enters the through hole 1231 of the elastic deformation structure. When the clamping protrusion 131 passes through the through hole 1231, the elastic deformation structure undergoes elastic deformation so that the clamping protrusion 131 can be in clamping cooperation with the elastic deformation structure. By providing the elastic deformation structure on the spacer 12, it is possible to meet the assembly requirements without the need to provide a deformation structure on the clamping protrusion 131, thereby improving the structural strength of the clamping protrusion 131 and reducing the occurrence of fracture of the clamping protrusion 131 during the assembly process.

[0238] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that, The battery cell includes: a housing, the housing including a first opening; a first end cap assembly for closing the first opening, the first end cap assembly including a clamping projection and a first electrode lead-out member; an electrode assembly received in the housing, the electrode assembly including a main body portion and a tab extending from the main body portion; a separator, at least a part of the separator being disposed between the first electrode lead-out member and the main body portion, the tab passing through the separator and being electrically connected to the first electrode lead-out member, the separator including a limiting projection, a limiting hole being defined in the limiting projection, the limiting hole being defined along the thickness direction of the separator, an elastic deformation structure being provided on the hole wall of the limiting hole, and the clamping projection being in clamping engagement with the elastic deformation structure; wherein the elastic deformation structure includes a through hole communicating with the limiting hole, and the elastic deformation structure is configured to elastically deform when the clamping projection is inserted into the limiting hole and passes through the through hole.

2. The battery cell according to claim 1, wherein The elastic deformation structure is a cylindrical structure, an interior of the cylindrical structure constitutes the through hole, a deformation gap is defined in the cylindrical structure, and a gap is provided between an outer peripheral surface of the elastic deformation structure and the hole wall of the limiting hole.

3. The battery cell according to claim 2, wherein, The gap between the outer peripheral surface of the elastic deformation structure and the hole wall of the limiting hole increases in a direction from the first end cap assembly to the main body portion; and / or the cylindrical structure extends obliquely in a direction from the first end cap assembly to the main body portion.

4. The battery cell according to claim 2, characterized in that, The clamping projection includes a limiting flange, and the cylindrical structure is configured such that when the limiting flange passes through the through hole, a size of the deformation gap expands and a diameter of the through hole increases, and after the limiting flange exits the through hole, the deformation gap resets and the diameter of the through hole resets, and the limiting flange is clamped on a side of the elastic deformation structure facing the main body portion.

5. The battery cell according to claim 4, wherein, One end of the elastic deformation structure facing the main body portion is spaced apart from the main body portion, the limiting flange is disposed between the elastic deformation structure and the main body portion, and a distance between the limiting flange and the main body portion is greater than or equal to zero.

6. The battery cell according to claim 1, wherein The limiting hole includes a first hole section and a second hole section, the first hole section and the second hole section are located on opposite sides of the elastic deformation structure, and the first hole section is closer to the main body portion than the second hole section; wherein a diameter of the first hole section is greater than a diameter of the second hole section.

7. The battery cell according to claim 6, characterized in that An arc transition is provided between the first hole section and the elastic deformation structure.

8. The battery cell according to claim 6, characterized in that, The clamping projection includes a limiting flange, the limiting flange is clamped on a side of the elastic deformation structure facing the main body portion, and the limiting flange is completely received in the first hole section.

9. The battery cell according to claim 8, wherein The through hole includes a straight hole section and a transition hole section. The straight hole section and the transition hole section are connected, and the straight hole section is farther from the first end cover assembly than the transition hole section. One end of the transition hole section is connected to the straight hole section, and the other end of the transition hole section is connected to the second hole section. Along the direction from the first end cover assembly to the main body portion, the size of the transition hole section shows a decreasing trend.

10. The battery cell according to claim 9, characterized in that, The clamping protrusion further includes a connecting column. The limiting flange is connected to the first end cover assembly through the connecting column, and at least a part of the connecting column is received in the through hole.

11. The battery cell according to claim 10, wherein, The connecting column includes a first connecting portion connected to the limiting flange. The size of the first connecting portion in the first direction is less than or equal to the size of the straight hole section in the first direction, and the size of the limiting flange in the first direction is greater than the size of the straight hole section in the first direction. The first direction is perpendicular to the thickness direction of the separator.

12. The battery cell according to claim 11, wherein, Along the first direction, the size of the first connecting portion is greater than or equal to 0.8 mm and less than or equal to 3 mm.

13. The battery cell according to claim 11, characterized in that, The connecting column further includes a transition connecting portion. The first connecting portion is connected to the first end cover assembly through the transition connecting portion, and at least a part of the transition connecting portion is disposed in the transition hole section. Along the direction from the first end cover assembly to the main body portion, the size of the transition connecting portion in the first direction shows a decreasing trend.

14. The battery cell according to claim 13, wherein, The connecting column further includes a second connecting portion. The transition connecting portion is connected to the first end cover assembly through the second connecting portion, and the second connecting portion is received in the second hole section.

15. The battery cell according to claim 13, characterized in that, There is a first included angle between the hole wall of the transition hole section and the central axis of the through hole, and a second included angle between the outer peripheral surface of the transition connecting portion and the central axis of the connecting column. The first included angle is less than or equal to the second included angle, wherein the direction of the central axis of the through hole is the same as the direction of the central axis of the connecting column.

16. The battery cell according to claim 15, wherein, The first included angle is greater than or equal to 20 degrees and less than or equal to 75 degrees; And / or, the second included angle is greater than or equal to 20 degrees and less than or equal to 75 degrees.

17. The battery cell according to claim 4, wherein Along the thickness direction of the separator plate, the limiting flange shows a decreasing trend.

18. The battery cell according to claim 2, characterized in that, The number of the deformation gaps is multiple, and the multiple deformation gaps are arranged at intervals along the circumferential direction of the limiting hole.

19. The battery cell according to claim 2, characterized in that, The deformation gap has a linear structure or a curved structure.

20. The battery cell according to claim 2, wherein Along the circumferential direction of the limiting hole, the size of the deformation gap is greater than or equal to 0.3 mm and less than or equal to 1.5 mm.

21. The battery cell according to claim 1, wherein The separator further includes a separator plate, and the limiting protrusion protrudes on the side of the separator facing the first end cover assembly.

22. The battery cell according to claim 21, wherein, The separator further includes a side plate, and the side plate surrounds the circumference of the separator plate and is connected to the separator plate. One end of the side plate facing the main body portion is flush with one end of the separator plate facing the main body portion.

23. The battery cell according to claim 22, wherein, The separator further includes a strengthening structure, and the strengthening structure is respectively connected to the separator plate, the limiting protrusion and the side plate.

24. The battery cell according to claim 23, wherein The number of the strengthening structures is multiple, and the multiple strengthening structures are arranged at intervals along the circumferential direction of the limiting protrusion.

25. The battery cell according to any one of claims 1 to 24, characterized in that, The first end cover assembly further includes a first end cover and an insulating member. The first electrode lead-out member is provided on the first end cover. The insulating member includes an insulating body and the clamping protrusion. The insulating body is provided on the side of the first end cover facing the main body portion, and the clamping protrusion is fixed to the side of the insulating body facing the main body portion.

26. The battery cell according to any one of claims 1 to 24, characterized in that, The housing further has a second opening opposite to the first opening; The battery cell further includes a second end cover assembly for covering the second opening.

27. A battery, characterized in that, The battery includes the battery cell according to any one of claims 1 to 26.

28. An electrical device, characterized in that The electrical device includes the battery according to claim 27.

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