Battery cell, battery and electrical device

Abstract

Provided are a battery cell (10), a battery (100) and an electrical device. The battery cell (10) comprises a casing (11), a first end cap assembly (13), an electrode assembly (14) and a separator (12); the first end cap assembly (13) comprises fitting protrusions (131) and a first electrode lead-out member (17); the electrode assembly (14) is accommodated in the casing (11); the electrode assembly (14) comprises a main body part (141) and a tab (142); the separator (12) is arranged between the first electrode lead-out member (17) and the main body part (141); the tab (142) passes through the separator (12) and is electrically connected to the first electrode lead-out member (17); the separator (12) comprises limiting protrusions (123); each limiting protrusion (123) is provided with a limiting hole (121); the wall of each limiting hole (121) is provided with an elastic deformation structure; the fitting protrusions (131) fit the elastic deformation structures; each elastic deformation structure comprises a pass-through hole (1231); the elastic deformation structures are configured to elastically deform when the fitting protrusions (131) are inserted into the limiting holes (121) and pass through the pass-through holes (1231). Providing the elastic deformation structures on the separator (12) can satisfy assembly requirements without the need to provide deformation structures on the fitting protrusions (131), thereby reducing the occurrence of fractures of the fitting protrusions (131) during assembly processes.

Description

Battery cells, batteries and electrical equipment Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Technology

[0002] With the development of new energy sources, more and more fields are adopting new energy sources as power sources. Due to their 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] The battery includes at least one battery cell, which comprises a casing, a support, and a cover. The support is disposed within the casing and has a locking hole. The cover has a latch, which is a protrusion with a deformation groove. This groove allows the protrusion to engage with the locking hole when the deformation groove undergoes elastic deformation. However, the deformation groove weakens the strength of the protrusion, making it prone to breakage during assembly.

[0004] Summary of the Invention

[0005] In view of the above problems, this application provides a battery cell, a battery, and an electrical device, which solves the problem that the protrusions on the cover plate are prone to breakage during the assembly process.

[0006] The first aspect of this application discloses a battery cell comprising:

[0007] The housing includes a first opening;

[0008] A first end cap assembly is used to cover a first opening. The first end cap assembly includes a snap-fit ​​protrusion and a first electrode lead-out.

[0009] An electrode assembly is housed within a housing and includes a main body and tabs extending from the main body.

[0010] An isolator, at least part of which is disposed between the first electrode lead-out and the main body, with the electrode tab passing through the isolator and electrically connected to the first electrode lead-out. The isolator includes a limiting protrusion with a limiting hole. The limiting hole is disposed along the thickness direction of the isolator, and the wall of the limiting hole is provided with an elastic deformation structure. The engaging protrusion engages with the elastic deformation structure.

[0011] The elastic deformation structure includes a through hole that is connected to a limiting hole. The elastic deformation structure is configured to undergo elastic deformation when the snap-fit ​​protrusion is inserted into the limiting hole and passes through the through hole.

[0012] Specifically, during assembly, the isolating component is placed inside the housing. Then, the snap-fit ​​protrusion of the first end cap assembly is inserted into the limiting hole of the limiting protrusion. As the snap-fit ​​protrusion is gradually inserted, it enters the through hole of the elastic deformation structure. When the snap-fit ​​protrusion passes through the through hole, the elastic deformation structure undergoes elastic deformation, allowing the snap-fit ​​protrusion to engage with the elastic deformation structure. By providing an elastic deformation structure on the isolating component, the snap-fit ​​protrusion can meet assembly requirements without requiring a deformation structure, thereby improving the structural strength of the snap-fit ​​protrusion and reducing the likelihood of breakage during assembly.

[0013] In some embodiments of this application, the elastic deformation structure is a cylindrical structure with a through hole inside and a deformation gap on the cylindrical structure. A gap exists between the outer peripheral surface of the elastic deformation structure and the wall of the limiting hole. The deformation gap enables the elastic deformation structure to deform, and the gap between the elastic deformation structure and the wall of the limiting hole provides space for the elastic deformation structure to deform during elastic deformation. This effectively satisfies the requirement for the snap-fit ​​protrusion to pass through the through hole of the elastic deformation structure, effectively achieving the snap-fit ​​engagement between the snap-fit ​​protrusion and the elastic deformation structure.

[0014] In some embodiments of this application, the gap between the outer peripheral surface of the elastic deformation structure and the wall of the limiting hole increases along the direction from the first end cap assembly to the main body. By setting the gap between the elastic deformation structure and the wall of the limiting hole, the elastic deformation structure has sufficient deformation space to meet the requirements of the snap-fit ​​protrusion, thereby effectively realizing the snap-fit ​​engagement between the snap-fit ​​protrusion and the elastic deformation structure.

[0015] In some embodiments of this application, the cylindrical structure extends obliquely along the direction from the first end cap assembly to the main body. In the direction from the first end cap assembly to the main body, the elastic deformation structure of the cylindrical structure is provided such that it has a large end and a small end, with the end facing the first end cap assembly being the large end and the end facing the main body being the small end. The snap-fit ​​protrusion passes through the through hole from the large end, and as the snap-fit ​​protrusion continues to penetrate, it effectively drives the elastic deformation structure to undergo elastic deformation, thereby achieving a snap-fit ​​engagement between the snap-fit ​​protrusion and the elastic deformation structure.

[0016] In some embodiments of this application, the snap-fit ​​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 disengages from the through hole, the deformation gap resets and the diameter of the through hole resets. The limiting flange snaps onto the side of the elastically deformable structure facing the main body. By providing a limiting flange and applying an external force to the elastically deformable structure when the limiting flange passes through the limiting hole, the elastically deformable structure undergoes elastic deformation by changing the size of the deformation gap. This allows the limiting flange to snap into the side of the elastically deformable structure facing the main body after passing through the through hole, thereby improving the ease of assembly.

[0017] In some embodiments of this application, the end of the elastic deformation structure facing the main body is spaced apart from the main body, and a limiting flange is disposed between the elastic deformation structure and the main body, with the distance between the limiting flange and the main body being greater than or equal to zero. Specifically, the limiting flange is accommodated by the space between the end of the elastic deformation structure facing the main body and the main body, and the distance between the limiting flange and the main body is set to be greater than or equal to zero, thereby reducing the impact of the snap-fit ​​protrusion on the main body and improving the safety performance of the battery cell.

[0018] In some embodiments of this application, the limiting hole includes a first hole segment and a second hole segment, which are located on opposite sides of the elastic deformation structure, with the first hole segment positioned closer to the main body than the second hole segment. The diameter of the first hole segment is larger than the diameter of the second hole segment. When the first end cap assembly is assembled with the spacer, the snap-fit ​​protrusion is inserted from the second hole segment towards the first hole segment. The diameter of the first hole segment is set to be larger than the diameter of the second hole segment, so that when the snap-fit ​​protrusion passes through the elastic deformation structure, the first hole segment provides a larger deformation space for the elastic deformation structure in the radial direction, allowing the elastic deformation structure to undergo elastic deformation.

[0019] In some embodiments of this application, the first hole segment and the elastic deformation structure have a circular arc transition. By setting the transition between the first hole segment and the elastic deformation structure to a circular arc, stress concentration at the connection point between the elastic deformation structure and the first hole segment is reduced, thereby reducing the problem of fracture of the elastic deformation structure due to stress concentration.

[0020] In some embodiments of this application, the snap-fit ​​protrusion includes a limiting flange, which snaps onto the side of the elastically deformable structure facing the main body and is completely accommodated within the first hole segment. When the first end cap assembly and the spacer are assembled in place, the limiting flange snaps onto the side of the elastically deformable structure facing the main body and is accommodated by the first hole segment, thereby reducing the possibility of the limiting flange protruding from the limiting hole, and further reducing the adverse effects on the main body caused by the limiting flange protruding from the limiting hole.

[0021] In some embodiments of this application, the through hole includes a straight hole section and a transition hole section, which are connected. The straight hole section is located further away from the first end cap assembly than the transition hole section. One end of the transition hole section is connected to the straight hole section, and the other end is connected to the second hole section. The size of the transition hole section decreases along the direction from the first end cap assembly to the main body. During assembly, when the snap-fit ​​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 snap-fit ​​protrusion exits through the straight hole section. By providing the transition hole section, guidance is achieved during the insertion process of the snap-fit ​​protrusion, improving the convenience of assembly and effectively enhancing assembly efficiency.

[0022] In some embodiments of this application, the snap-fit ​​protrusion further includes a connecting post, and the limiting flange is connected to the first end cap assembly via the connecting post. At least a portion of the connecting post is received in the through hole. The connecting post is provided such that the limiting flange and the first end cap assembly are spaced apart, so that the limiting flange can be effectively inserted into and disengaged from the through hole of the elastic deformation structure, thereby realizing the snap-fit ​​engagement between the snap-fit ​​protrusion and the elastic deformation structure.

[0023] In some embodiments of this application, the connecting post includes a first connecting portion connected to a limiting flange. The dimension of the first connecting portion along a first direction is less than or equal to the dimension of the straight hole section along the first direction, and 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 undergo elastic deformation when the limiting flange passes through the straight hole section and recover elastic deformation when the limiting flange comes out. Furthermore, the elastic deformation structure that recovers elastic deformation limits the limiting flange, reducing the possibility of the limiting flange falling off in the opposite direction, thereby improving the structural stability of the connection position.

[0024] In some embodiments of this application, the dimension of the first connecting portion along the first direction 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 possibility of the first connecting portion breaking under stress can be reduced.

[0025] In some embodiments of this application, the connecting post further includes a transition connection portion. The first connecting portion is connected to the first end cap assembly via the transition connection portion. At least a portion of the transition connection portion passes through a transition hole section. In the direction from the first end cap assembly to the main body, the dimension of the transition connection portion decreases along a first direction. Providing the transition connection portion increases the structural strength of the snap-fit ​​protrusion, further reducing the likelihood of the snap-fit ​​protrusion breaking during assembly.

[0026] In some embodiments of this application, the connecting post further includes a second connecting portion, through which the transition connecting portion is connected to the first end cap assembly, and the second connecting portion is accommodated within a second hole segment. By providing the second connecting portion and placing it within the second hole segment, the second hole segment limits the second connecting portion in the first direction, reducing the possibility of movement of the locking protrusion relative to the isolator in the first direction and improving the assembly accuracy of the first end cap assembly.

[0027] In some embodiments of this application, the wall of the transition hole section has a first included angle with the central axis of the through hole, and the outer peripheral surface of the transition connection portion has a second included angle with 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 consistent with the direction of the central axis of the connecting column. By configuring the transition hole section and the transition connection portion, the transition connection portion can effectively adapt to the shape of the transition hole section, reducing the influence of manufacturing tolerances and other factors on assembly, and enabling the assembly operation to be performed effectively.

[0028] In some embodiments of this application, the first included angle is greater than or equal to 20 degrees and less than or equal to 75 degrees. By setting the first included angle, the ease of processing is improved while simultaneously guiding the snap-fit ​​protrusion.

[0029] In some embodiments of this application, the second tilt angle is greater than or equal to 20 degrees and less than or equal to 75 degrees. By setting the second included angle, the transition connection portion can effectively adapt to the structure of the transition hole section, thereby enabling effective assembly.

[0030] In some embodiments of this application, the limiting flange surface decreases in thickness along the partition plate. By configuring the limiting flange so that the side of the limiting flange away from the first end cap assembly is narrowed, it is easier for the limiting flange to be inserted into the limiting hole, thereby improving the ease of assembly.

[0031] In some embodiments of this application, there are multiple deformation gaps, which are spaced apart along the circumferential direction of the limiting hole. By providing multiple deformation gaps, the elastic deformation capability of the elastic deformation structure is improved, thereby increasing the convenience of the snap-fit ​​protrusion passing through the through hole and effectively improving the assembly efficiency.

[0032] In some embodiments of this application, the deformation gap has a straight or curved structure. By setting the shape of the deformation gap, it can be configured according to requirements, thereby meeting production needs.

[0033] In some embodiments of this application, the size of the deformation gap along the circumferential direction of the limiting hole 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 possessing elastic deformation properties, reducing the occurrence of the snap-fit ​​protrusion falling off.

[0034] In some embodiments of this application, the separator further includes a separator plate, with a limiting protrusion extending outward from the side of the separator facing the first end cap assembly. The separator plate is disposed between the first end cap assembly and the main body, thereby improving the barrier performance by separating the first end cap assembly from the main body.

[0035] In some embodiments of this application, the spacer further includes a side plate surrounding and connected to the spacer plate circumferentially, with one end of the side plate facing the main body flush with the other end of the spacer plate facing the main body. The side plate surrounds the outside of the spacer plate and protrudes from the side of the spacer plate opposite to the main body, so that the spacer plate and the side plate together define a receiving recess that can accommodate at least a portion of the electrode tab, thereby improving the compactness of the structure.

[0036] In some embodiments of this application, the spacer further includes a reinforcing structure, which is connected to the partition plate, the limiting protrusion, and the side plate, respectively. The reinforcing structure improves the connection strength between the limiting protrusion and the spacer plate, reducing the likelihood of the limiting protrusion breaking relative to the spacer plate.

[0037] In some embodiments of this application, there are multiple reinforcing structures, which are spaced apart along the circumferential direction of the limiting protrusion. Providing multiple reinforcing structures further improves the structural strength of the limiting protrusion and reduces the likelihood of the limiting protrusion breaking relative to the isolation plate.

[0038] In some embodiments of this application, the first end cap assembly further includes a first end cap and an insulating member. A first electrode lead is disposed on the first end cap. The insulating member includes an insulating body and a snap-fit ​​protrusion. The insulating body is disposed on the side of the first end cap facing the main body, and the snap-fit ​​protrusion is fixed to the side of the insulating body facing the main body. The first end cap closes with the first opening of the housing, and the first electrode lead on the first end cap is electrically connected to the electrode tab. The snap-fit ​​protrusion of the insulating member engages with the elastic deformation structure in the limiting hole of the isolator. By providing the first end cap assembly, the connection of the first end cap assembly, the isolator, and the electrode assembly is facilitated.

[0039] In some embodiments of this application, the housing also has a second opening opposite to the first opening, and the battery cell further includes a second end cap assembly for covering the second opening. The first end cap assembly and the second end cap assembly are respectively used to cover the first opening and the second opening at both ends of the housing, thereby facilitating the sealing of the housing.

[0040] A second aspect of this application provides for a battery comprising a battery cell as described above.

[0041] When assembling individual battery cells, the separator is placed inside the housing. The snap-fit ​​protrusion of the first end cap assembly is then inserted into the limiting hole of the limiting protrusion. As the snap-fit ​​protrusion is gradually inserted, it enters the through hole of the elastic deformation structure. When the snap-fit ​​protrusion passes through the through hole, the elastic deformation structure undergoes elastic deformation, allowing the snap-fit ​​protrusion to engage with the elastic deformation structure. By providing an elastic deformation structure on the separator, the snap-fit ​​protrusion can meet assembly requirements without requiring a deformation structure, thereby improving the structural strength of the snap-fit ​​protrusion and reducing the likelihood of breakage during assembly.

[0042] A third aspect of this application provides an electrical device comprising the battery described above.

[0043] In electrical equipment, during the assembly of individual battery cells, a spacer is placed inside the housing. The snap-fit ​​protrusion of the first end cap assembly is then inserted into the limiting hole of the limiting protrusion. As the snap-fit ​​protrusion is gradually inserted, it enters the through hole of the elastic deformation structure. When the snap-fit ​​protrusion passes through the through hole, the elastic deformation structure undergoes elastic deformation, allowing the snap-fit ​​protrusion to engage with the elastic deformation structure. By incorporating an elastic deformation structure on the spacer, the snap-fit ​​protrusion can meet assembly requirements without requiring a deformation structure, thereby improving its structural strength and reducing the likelihood of breakage during assembly.

[0044] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0045] Figure 1 schematically shows a structural diagram of a vehicle according to one embodiment of this application;

[0046] Figure 2 schematically shows a structural diagram of a battery according to one embodiment of this application;

[0047] Figure 3 schematically shows an exploded structural diagram of a battery cell according to one embodiment of this application;

[0048] Figure 4 is a cross-sectional view of the battery cell shown in Figure 3 in the assembled state (showing part of the structure);

[0049] Figure 5 is an enlarged structural diagram of part A of the battery cell shown in Figure 4;

[0050] Figure 6 is a structural schematic diagram of the support member shown in Figure 3;

[0051] Figure 7 is a cross-sectional view of the BB section of the support member shown in Figure 6;

[0052] Figure 8 is an enlarged structural schematic diagram of part C of the support member shown in Figure 7;

[0053] Figure 9 is a structural schematic diagram of the support member shown in Figure 6 from another perspective;

[0054] Figure 10 is a schematic diagram of the structure of the first cover plate shown in Figure 3 (showing the electrode terminals);

[0055] Figure 11 is a structural schematic diagram of the first cover plate shown in Figure 10 from another perspective;

[0056] Figure 12 is an enlarged structural diagram of part D of the first cover plate shown in Figure 11.

[0057] The attached figures are labeled as follows:

[0058] 1000, vehicles;

[0059] 100. Battery; 200. Controller; 300. Motor;

[0060] 110. Battery assembly;

[0061] 10. Battery cells;

[0062] 11. Shell;

[0063] 111. The first opening;

[0064] 12. Isolation components;

[0065] 121. Limiting hole; 1211. First hole section; 1212. Second hole section; 122. Through hole; 123. Limiting protrusion; 1231. Through hole; 12311. Straight hole section; 12312. Transition hole section; 1232. Deformation gap; 124. Isolation plate; 125. Side plate; 126. Reinforcing structure;

[0066] 13. First end cap assembly;

[0067] 131. Snap-fit ​​protrusion; 1311. Limiting flange; 1312. Connecting post; 13121. First connecting part; 13122. Transition connecting part; 13123. Second connecting part; 132. Injection hole; 133. Baffle; 134. First end cap; 135. Insulating component;

[0068] 14. Electrode assembly;

[0069] 141. Main body; 142. Electrode;

[0070] 15. Second end cap assembly;

[0071] 16. Insulating film;

[0072] 17. First electrode lead-out component;

[0073] 120. Box body;

[0074] 1201, Part One; 1202, Part Two.

[0075] 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

[0076] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0078] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0079] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0080] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0081] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0082] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "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 accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0083] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0084] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0085] In related technologies, a battery includes at least one battery cell, which comprises a housing, a support, and a cover. The support is disposed within the housing and has a locking hole, while the cover has a buckle, which is a protrusion with a deformation groove. This groove allows the protrusion to engage with the locking hole when the deformation groove undergoes elastic deformation. However, the deformation groove weakens the strength of the protrusion, making it prone to breakage during assembly.

[0086] In this application, the battery cell includes a housing, a first end cap assembly, an electrode assembly, and a separator. The housing includes a first opening, and the first end cap assembly is used to cover the first opening. The first end cap assembly includes a snap-fit ​​protrusion and a first electrode lead-out. The electrode assembly is housed within the housing and includes a main body and a tab extending from the main body. At least a portion of the separator is disposed between the first electrode lead-out and the main body. The tab passes through the separator and is electrically connected to the first electrode lead-out. The separator includes a limiting protrusion with a limiting hole. The limiting hole is formed along the thickness direction of the separator, and the wall of the limiting hole is provided with an elastic deformation structure. The snap-fit ​​protrusion engages with the elastic deformation structure. The elastic deformation structure includes a through hole that communicates with the limiting hole. The elastic deformation structure is configured to undergo elastic deformation when the snap-fit ​​protrusion is inserted into the limiting hole and passes through the through hole. Specifically, during assembly, the isolating component is placed inside the housing. Then, the snap-fit ​​protrusion of the first end cap assembly is inserted into the limiting hole of the limiting protrusion. As the snap-fit ​​protrusion is gradually inserted, it enters the through hole of the elastic deformation structure. When the snap-fit ​​protrusion passes through the through hole, the elastic deformation structure undergoes elastic deformation, allowing the snap-fit ​​protrusion to engage with the elastic deformation structure. By providing an elastic deformation structure on the isolating component, the snap-fit ​​protrusion can meet assembly requirements without requiring a deformation structure, thereby improving the structural strength of the snap-fit ​​protrusion and reducing the likelihood of breakage during assembly.

[0087] The batteries described in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells or batteries as described in this application.

[0088] In addition, electrical devices that use batteries as a power source can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0089] The technical solutions described in this application are not limited to the devices described above, but can also be applied to all devices that use batteries. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0090] For example, as shown in Figure 1, which is a structural schematic diagram of a vehicle according to one embodiment of this application, the vehicle 1000 can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. The vehicle 1000 can have a motor 300, a controller 200, and a battery 100 installed inside. The controller 200 controls the battery 100 to supply power to the motor 300. For example, the battery 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000's electrical system, such as for the power requirements of starting, navigation, and operation of the vehicle 1000. In another embodiment of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source for the vehicle 1000, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle 1000.

[0091] As shown in Figure 2, the battery 100 may include multiple battery components 110 and a housing 120, with the multiple battery components 110 housed inside the housing 120.

[0092] To meet diverse power demands, the battery assembly 110 may include multiple battery cells 10 and a busbar. A battery cell 10 is the smallest unit comprising the battery assembly 110. The busbar is used to achieve electrical connection between the multiple battery cells 10 for various applications, such as parallel, series, or mixed connections. Specifically, the busbar can achieve electrical connection between battery cells 10 by connecting the electrode leads of the battery cells 2. Battery cells 10 may include, but are not limited to, lithium-ion batteries 100, sodium-ion batteries 100, or magnesium-ion batteries 100. Furthermore, the shape of the battery cells 10 may include, but is not limited to, cylindrical, flat, cuboid, or other shapes.

[0093] The housing 120 is used to house the battery assembly 110 to reduce the impact of liquids or other foreign objects on the charging or discharging of the individual 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 simple cuboids, cylinders, or spheres. The material of the housing 120 can be an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0094] As shown in Figure 2, the housing 120 may include a first part 1201 and a second part 1202, which overlap each other, and together define a space for accommodating the battery assembly 110. The second part 1202 may be a hollow structure with one end open, and the first part 1201 may be a plate-like structure, with the first part 1201 covering the open side of the second part 1202, so that the first part 1201 and the second part 1202 together define a space for accommodating the battery assembly 110; the first part 1201 and the second part 1202 may also be hollow structures with one side open, with the open side of the first part 1201 covering the open side of the second part 1202.

[0095] In some embodiments of this application, as shown in Figures 3 to 12, 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, and the first end cap assembly 13 is used to cover the first opening. The first end cap assembly 13 includes a snap-fit ​​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 141 and a tab 142 extending from the main body 141. At least a portion of the insulating member 12 is disposed between the first electrode lead-out member 17 and the main body 141. The tab 142 passes through the insulating member 12 and is electrically connected to the first electrode lead-out member 17. The insulating member 12 includes a limiting protrusion 123, and a limiting hole 121 is formed on the limiting protrusion 123. The limiting hole 121 is formed along the thickness direction a of the insulating member 12. An elastic deformation structure is provided on the wall of the limiting hole 121. The engaging protrusion 131 engages with the elastic deformation structure. The elastic deformation structure includes a through hole 1231, which communicates with the limiting hole 121. The elastic deformation structure is configured to undergo elastic deformation when the engaging protrusion 131 is inserted into the limiting hole 121 and passes through the through hole 1231.

[0096] As shown in Figure 3, 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 may have one opening, which is the first opening. Alternatively, the housing 11 may have other openings besides the first opening.

[0097] The housing 11 is used to accommodate the electrode assembly 14. The shape of the housing 11 can be determined according to the shape of one or more electrode assemblies 14 combined. For example, the housing 11 is a hollow cuboid. Embodiments of this application include, but are not limited to, hollow cubes, cylinders or other shapes.

[0098] The housing 11 can be made of various materials, such as metal or plastic. As some examples, the housing 11 can be made of copper, iron, aluminum, steel, aluminum alloy, etc.

[0099] As shown in Figures 3 and 11, the first end cap assembly 13 includes a snap-fit ​​protrusion 131 and a first electrode lead-out member 17. The first electrode lead-out member 17 is used to electrically connect the electrode assembly 14 to an external circuit of the battery cell 10 to enable charging and discharging of the electrode assembly 14. As an example, at least a portion of the first electrode lead-out member 17 is exposed to the outside of the battery cell 10 to facilitate connection with a busbar component, thereby extracting the electrical energy generated by the electrode assembly 14.

[0100] The electrode assembly 14 consists of a positive electrode, a negative electrode, and a separator. The battery cell 10 primarily operates by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the current collector without the positive active material layer protrudes beyond it, serving as the positive electrode tab 142. Taking a lithium-ion battery 100 as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the current collector without the negative active material layer protrudes beyond it, serving as the negative electrode tab 142. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can pass through without melting, multiple positive electrode tabs 142 are stacked together, and multiple negative electrode tabs 142 are stacked together. The separator can be made of polypropylene (PP) or polyethylene (PE), etc. Furthermore, the electrode assembly 14 can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0101] In the electrode assembly 14, the tab 142 can be directly connected to the first electrode lead 17, or it can be indirectly connected to the first electrode lead 17 via other conductive structures.

[0102] Multiple electrodes 142 can be provided. The multiple electrodes 142 include positive electrodes 142 and negative electrodes 142. The positive electrodes 142 and negative electrodes 142 can be led out from the same end of the main body 141, or they can be led out from opposite ends of the main body 141 along the thickness direction a of the first end cap assembly 13.

[0103] The tab 142 may include multiple tab 142 layers, which are stacked together to form the tab 142. The tab 142 may include at least two parts, one part being located between the main body 141 and the spacer 12, and the other part being located between the spacer and the first electrode lead-out member 17.

[0104] The separator 12 can insulate at least a portion of the tab 142 from the end face of the main body 141, thereby reducing the risk of the tab 142 inserting into the main body 141 when the battery cell 10 is affected by external impacts, vibrations, etc., thereby reducing the risk of short circuit in the battery cell 10 and improving the reliability of the battery cell 10.

[0105] The isolation member 12 can be partially disposed between the first electrode lead-out member 17 and the main body 141, or it can be disposed entirely between the first electrode lead-out member 17 and the main body 141.

[0106] The spacer 12 can be a one-piece structure or a split structure. As one example, the spacer 12 is composed of multiple independently formed parts connected together. As another example, the spacer 12 is formed by stamping.

[0107] In this application, a first opening is formed on the housing 11 and communicates with the interior of the housing 11, through which internal components of the battery cell 10, such as the separator 12, can be installed. When the first end cap assembly 13 is assembled on the housing 11, the first end cap assembly 13 closes the first opening, thereby isolating the battery cell 10 from the inside and outside at the location of the first opening. A first sealing structure may be provided at the junction of the first end cap assembly 13 and the first opening, which includes, but is not limited to, a sealing ring or sealant.

[0108] In this application, a limiting protrusion 123 is provided on the isolation member 12, and the limiting protrusion 123 protrudes from the surface having the limiting protrusion 123. A limiting hole 121 is formed on the limiting protrusion 123. The forming direction (depth direction) of the limiting hole 121 is along the thickness direction a of the isolation member 12 (the arrangement direction of the first end cap assembly 13 and the main body 141 is consistent with the thickness direction a of the isolation member 12) or at an acute angle to the thickness direction a of the isolation member 12.

[0109] As shown in Figures 4 to 9, the elastic deformation structure is disposed 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. The elastic deformation structure protrudes from the hole wall of the limiting hole 121 along the radial direction of the limiting hole 121 (the radial direction of the limiting hole 121 is consistent with the first direction b, wherein the first direction b is perpendicular to the thickness direction a of the separator 12). The through hole 1231 is formed on the elastic deformation structure. The elastic deformation structure can undergo elastic deformation along the radial direction of the limiting hole 121 when the snap protrusion 131 is inserted into the through hole 1231.

[0110] In this application, during the assembly of the battery cell 10, the separator 12 is placed inside the housing 11, and then the snap-fit ​​protrusion 131 of the first end cap assembly 13 is inserted into the limiting hole 121 of the limiting protrusion 123. As the snap-fit ​​protrusion 131 is gradually inserted, it enters the through hole 1231 of the elastic deformation structure. When the snap-fit ​​protrusion 131 passes through the through hole 1231, the elastic deformation structure undergoes elastic deformation, allowing the snap-fit ​​protrusion 131 to engage with the elastic deformation structure. By providing an elastic deformation structure on the separator 12, the snap-fit ​​protrusion 131 can meet the assembly requirements without the need for a deformation structure, thereby improving the structural strength of the snap-fit ​​protrusion 131 and reducing the possibility of breakage during assembly.

[0111] It should be understood that in this application, the snap-fit ​​protrusion 131 and the elastic deformation structure are engaged in a snap-fit ​​manner, wherein the snap-fit ​​means that the snap-fit ​​protrusion 131 and the elastic deformation structure are engaged in a snap-fit ​​manner, and the snap-fit ​​protrusion 131 and the elastic deformation structure can move relative to each other (e.g., rotate or move).

[0112] It should be noted that in this application, the number of snap-fit ​​protrusions 131 can be one, two, three, four, five, six, seven, eight, etc. When the number of snap-fit ​​protrusions 131 is multiple (two or more), the multiple snap-fit ​​protrusions 131 are distributed on the same side of the first end cap assembly 13 facing the main body 141. By setting multiple snap-fit ​​protrusions 131, the fixing strength and stability of the first end cap assembly 13 can be improved.

[0113] In addition, the number of limiting protrusions 123 is consistent with the number of snap-fit ​​protrusions 131, and each snap-fit ​​protrusion 131 is correspondingly provided with one limiting protrusion 123.

[0114] In some embodiments of this application, as shown in Figures 5 to 9, the elastic deformation structure is a cylindrical structure. The interior of the cylindrical structure has a through hole 1231, and the cylindrical structure has a deformation gap 1232. A gap is provided between the outer peripheral surface of the elastic deformation structure and the wall of the limiting hole 121.

[0115] Specifically, the cylindrical structure is a hollow structure with openings at both ends. One axial end of the cylindrical structure is connected to the wall of the limiting hole 121 (the connection method includes, but is not limited to, bonding, welding, connection via connectors, or integral molding). The other axial end of the cylindrical structure is spaced apart from the wall of the limiting hole 121, thereby creating a gap between the elastic deformation structure of the cylindrical structure and the wall of the limiting hole 121.

[0116] Deformation gap 1232 is formed on the side wall of the cylindrical structure. Deformation gap 1232 is provided through the interior and exterior of the cylindrical structure. At the same time, along the axial direction of the cylindrical structure, deformation gap 1232 is provided through at least one end of the cylindrical structure facing the main body 141.

[0117] During assembly, the isolator 12 is placed inside the housing 11 through the first opening and abuts against the main body 141 of the electrode assembly 14. Simultaneously, the electrode tab 142 passes through the isolator 12. The side of the first end cap assembly 13 with the snap-fit ​​protrusion 131 is then positioned facing the isolator 12. The electrode tab 142 is electrically connected to the first electrode lead-out member 17 on the first end cap assembly 13. The snap-fit ​​protrusion 131 is then inserted into the limiting hole 121. When the snap-fit ​​protrusion 131 is inserted into the elastic deformation structure... When the material is inserted into the through hole 1231, the elastic deformation structure undergoes elastic deformation along the radial direction of the limiting hole 121 (the radial direction of the limiting hole 121 is consistent with the first direction b, wherein the first direction b is perpendicular to the thickness direction a of the separator 12) (elastic deformation occurs 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 diameter of the through hole 1231 increases, thereby meeting the through hole requirements of the snap-fit ​​protrusion 131.

[0118] The deformation gap 1232 is provided so that the elastic deformation structure has the ability to deform, thereby meeting the deformation requirements when the snap-fit ​​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 space for the elastic deformation structure to deform during elastic deformation, thus effectively meeting the requirement that the snap-fit ​​protrusion 131 passes through the through hole 1231 of the elastic deformation structure, and effectively realizing the snap-fit ​​cooperation between the snap-fit ​​protrusion 131 and the elastic deformation structure.

[0119] In some embodiments of this application, as shown in Figures 5 and 8, the gap between the outer peripheral surface of the elastic deformation structure and the wall of the limiting hole 121 tends to increase along the direction from the first end cap assembly 13 to the main body 141.

[0120] Specifically, the elastic deformation structure is a cylindrical structure, which is coaxially arranged with the limiting hole 121. The cylindrical structure includes a first end and a second end in the axial direction. The first end is arranged facing the first end cap assembly 13 and connected to the hole wall of the limiting hole 121, while the second end is arranged away from the first end cap assembly 13 and spaced apart from the hole wall of the limiting hole 121.

[0121] The outer peripheral surface of the elastic deformation structure is disposed 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, wherein the first direction b is perpendicular to the thickness direction a of the separator 12), there is a gap between the outer peripheral surface of the elastic deformation structure and the hole wall of the limiting hole 121. This gap tends to increase along the axial direction of the cylindrical structure (the direction from the first end cap assembly 13 to the main body 141). The increasing trend can be a continuous structure or an intermittent structure.

[0122] In this application, the elastic deformation structure of the cylindrical structure is a frustum-shaped structure (the distance between the outer peripheral surface of the elastic deformation structure and the wall of the limiting hole 121 gradually and continuously increases from the first end to the second end), wherein the first end is the large end of the frustum-shaped structure, the second end is the small end of the frustum-shaped structure, and the shape of the through hole 1231 is consistent with the shape of the cylindrical structure, that is, the diameter of the through hole 1231 at the first end is greater than the diameter at the second end. When the snap-fit ​​protrusion 131 passes through the through hole 1231, as the snap-fit ​​protrusion 131 is continuously inserted, it compresses the inner wall of the through hole 1231. Under the action of the compressive force, the elastic deformation structure (the body except the first end) undergoes elastic deformation along the radial direction of the limiting hole 121 (the radial direction of the limiting hole 121 is consistent with the first direction b, wherein the first direction b is perpendicular to the thickness direction a of the separator 12), thereby increasing the diameter of the through hole 1231 to meet the through-pass requirement of the snap-fit ​​protrusion 131.

[0123] By setting the gap between the elastic deformation structure and the hole wall of the limiting hole 121, the elastic deformation structure has enough deformation space to meet the requirement of the snap-fit ​​protrusion 131 passing through, thereby effectively realizing the snap-fit ​​cooperation between the snap-fit ​​protrusion 131 and the elastic deformation structure.

[0124] In some embodiments of this application, as shown in Figures 5 and 8, the cylindrical structure extends obliquely along the direction from the first end cap assembly 13 to the main body 141.

[0125] Specifically, the elastic deformation structure of the cylindrical structure includes an axial first end and a second end, wherein the first end is disposed facing the first end cap assembly 13 and connected to the wall of the limiting hole 121, and the second end is disposed away from the first end cap assembly 13 and is not connected to the wall of the limiting hole 121.

[0126] The cylindrical structure extends obliquely along the direction from the first end cap assembly 13 to the main body 141, meaning that the second end of the side wall of the cylindrical structure is obliquely arranged from the hole wall of the limiting hole 121 towards the central axis of the limiting hole 121, such 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, thereby forming a frustum-shaped structure (the first end is the small end, and the second end is the large end).

[0127] In the direction from the first end cap assembly 13 to the main body 141, an elastic deformation structure of cylindrical structure is provided, such that the elastic deformation structure of cylindrical structure has a large end and a small end, and the end facing the first end cap assembly 13 is the large end (first end), and the end facing the main body 141 is the small end (second end). The snap-fit ​​protrusion 131 passes through the through hole 1231 from the large end, and as the snap-fit ​​protrusion 131 continues to pass through, it effectively drives the elastic deformation structure to undergo elastic deformation, thereby realizing the snap-fit ​​engagement between the snap-fit ​​protrusion 131 and the elastic deformation structure.

[0128] In some embodiments of this application, as shown in Figures 5, 10 and 12, the snap-fit ​​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. After the limiting flange 1311 disengages from the through hole 1231, the deformation gap 1232 resets and the diameter of the through hole 1231 resets. The limiting flange 1311 is snapped onto the side of the elastic deformation structure facing the main body 141.

[0129] Specifically, in this application, the snap-fit ​​protrusion 131 includes a limiting flange 1311, which 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 engages with the side of the elastic deformation structure facing the main body 141. The limiting flange 1311 can limit the first end cap assembly 13 in the thickness direction a of the spacer 12, thereby keeping the first end cap assembly 13 in the assembled state.

[0130] 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 towards the elastic deformation structure. As 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 the 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 compresses the hole wall of the through hole 1231. Driven by this, the elastic deformation structure undergoes elastic deformation (the deformation gap 1232 increases), causing the through hole 1231 to be opened and its diameter to be increased to meet the passage requirements of the limiting flange 1311. When the limiting flange 1311 is dislodged from the through hole 1231, the elastic deformation structure resets, and the opened through hole 1231 returns to its original diameter. The diameter of the reset through hole 1231 is no longer sufficient for the limiting flange 1311 to pass through in the opposite direction from the main body 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 141.

[0131] A limiting flange 1311 is provided, and when the limiting flange 1311 passes through the limiting hole 121, an external force is applied to the elastic deformation structure, so that the elastic deformation structure undergoes elastic deformation by changing the size of the deformation gap 1232. This allows the limiting flange 1311 to engage with the side of the elastic deformation structure facing the main body 141 after passing through the through hole 1231, thereby improving the ease of assembly.

[0132] In addition, as shown in FIG5, in this application, a limiting flange 1311 is provided between the elastic deformation structure and the main body 141, and a preset gap m is provided between the limiting flange 1311 and the end of the elastic deformation structure facing the main body 141, the preset gap m being greater than or equal to 0.

[0133] When the preset gap m is 0, the limiting flange 1311 abuts against the end of the elastic deformation structure facing the main body 141, thereby achieving the snap-fit ​​fixation of the snap-fit ​​protrusion 131 and the elastic deformation structure in the thickness direction a of the isolation member 12; when the preset gap m is greater than 0, the limiting flange 1311 and the end of the elastic deformation structure facing the main body 141 are spaced apart, wherein 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 spaced apart the limiting flange 1311 and the end of the elastic deformation structure facing the main body 141, the adverse effects of manufacturing tolerances and other factors on assembly (such as incomplete assembly) are reduced, effectively meeting the assembly requirements.

[0134] In some embodiments of this application, as shown in FIG5, one end of the elastic deformation structure facing the main body 141 is spaced apart from the main body 141, the limiting flange 1311 is disposed between the elastic deformation structure and the main body 141, and the distance between the limiting flange 1311 and the main body 141 is greater than or equal to zero.

[0135] Specifically, the elastic deformation structure is disposed within 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 the other end of the elastic deformation structure facing the main body 141 is spaced apart from the main body 141. When the snap-fit ​​protrusion 131 with the limiting flange 1311 is dislodged through the through hole 1231 on the elastic deformation structure, the limiting flange 1311 is disposed within the space between the limiting hole 121 and the main body 141, and the distance between the limiting flange 1311 and the main body 141 is greater than or equal to zero.

[0136] The limiting flange 1311 is accommodated by the space between the end of the elastic deformation structure facing the main body 141 and the main body 141, and the distance between the limiting flange 1311 and the main body 141 is set to be greater than or equal to zero, thereby reducing the impact of the snap-fit ​​protrusion 131 on the main body 141 and improving the safety performance of the battery cell 10.

[0137] In some embodiments of this application, as shown in Figures 5 and 8, the limiting hole 121 includes a first hole segment 1211 and a second hole segment 1212. The first hole segment 1211 and the second hole segment 1212 are located on opposite sides of the elastic deformation structure, and the first hole segment 1211 is disposed closer to the main body 141 than the second hole segment 1212. The diameter of the first hole segment 1211 is larger than the diameter of the second hole segment 1212.

[0138] Specifically, the elastic deformation structure is a cylindrical structure. The elastic deformation structure of the cylindrical structure is disposed in the limiting hole 121 of the limiting protrusion 123 and is coaxially disposed 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. The end of the cylindrical structure facing the main body 141 is spaced apart from the port of the limiting hole 121 facing the main body 141. At the same time, the end of the cylindrical structure facing the main body 141 is spaced apart from the hole wall of the limiting hole 121.

[0139] The elastic deformation structure divides the through hole 1231 into two segments, namely the first hole segment 1211 and the second hole segment 1212. The first hole segment 1211 is located on the side of the elastic deformation structure facing the main body 141, and the second hole segment 1212 is located on the side of the elastic deformation structure facing the first end cap assembly 13. Furthermore, the diameter of the first hole segment 1211 is set to be larger than the diameter of the second hole segment 1212.

[0140] When the first end cap assembly 13 is assembled with the spacer 12, the snap-fit ​​protrusion 131 is inserted 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-fit ​​protrusion 131 passes through the elastic deformation structure, the first hole segment 1211 provides a larger deformation space for the elastic deformation structure in the radial direction of the first hole segment 1211, so that the elastic deformation structure can undergo elastic deformation.

[0141] In addition, by setting the diameter of the first hole segment 1211 to be larger than the diameter of the second hole segment 1212, the wall thickness of the limiting protrusion 123 at the position of the second hole segment 1212 can be increased, thereby improving the structural strength of the limiting protrusion 123 and reducing the problem of deformation or breakage of the limiting protrusion 123 due to impact or other reasons.

[0142] In some embodiments of this application, as shown in Figures 5 and 8, the first hole segment 1211 has a circular arc transition with the elastic deformation structure.

[0143] Specifically, in this application, the elastic deformation structure is configured as a cylindrical structure, comprising an axial first end and a second end. The first end faces the first end cap assembly 13 and is connected to the wall of the limiting hole 121. The second end faces away from the first end cap assembly 13, is not connected to the wall of the limiting hole 121, and is spaced apart from the wall of the limiting hole 121. The second end of the sidewall of the cylindrical structure is inclined from the wall of the limiting hole 121 in the direction of the central axis of the limiting hole 121, such that the distance between the second end and the wall of the limiting hole 121 is greater than the distance between the first end and the wall of the limiting hole 121, thereby forming a frustum-shaped structure (the first end is the small end, and the second end is the large end).

[0144] The first end is connected to the wall of the limiting hole 121. The angle between the outer peripheral surface of the elastic deformation structure and the first hole segment 1211 is an acute angle, and the angle between the outer peripheral surface of the elastic deformation structure and the second hole segment 1212 is an obtuse angle. When the snap-fit ​​protrusion 131 with the limiting flange 1311 passes through the through hole 1231 on the elastic deformation structure, the elastic deformation structure undergoes elastic deformation in the first hole segment 1211 towards the wall of the limiting hole 121, so that the snap-fit ​​protrusion 131 with the limiting flange 1311 can pass through.

[0145] An arc transition is set at the connection position between the elastic deformation structure and the first hole segment 1211. By setting an arc transition between the first hole segment 1211 and the elastic deformation structure, the stress concentration at the connection position between the elastic deformation structure and the first hole segment 1211 is reduced, thereby reducing the problem of the elastic deformation structure breaking due to stress concentration.

[0146] It should be noted that the radius of the arc transition between the first hole segment 1211 and the elastic deformation structure can be set as needed. The specific value will not be elaborated in this application.

[0147] In some embodiments of this application, as shown in Figures 5, 10, 11 and 12, the snap-fit ​​protrusion 131 includes a limiting flange 1311, which snaps onto the side of the elastic deformation structure facing the main body 141, and the limiting flange 1311 is completely accommodated in the first hole segment 1211.

[0148] Specifically, in this 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 of the cylindrical structure is coaxially disposed within the limiting hole 121 of the limiting protrusion 123. The first end of the cylindrical structure faces the first end cap 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 141 and is spaced apart from the port of the limiting hole 121 facing the main body 141. The elastic deformation structure divides the through hole 1231 into a first hole segment 1211 and a second hole segment 1212. The first hole segment 1211 is located on the side of the elastic deformation structure facing the main body 141, and the second hole segment 1212 is located on the side of the elastic deformation structure facing the first end cap assembly 13.

[0149] The snap-fit ​​protrusion 131 includes a limiting flange 1311, which is spaced apart from the first end cap assembly 13. The maximum diameter of the limiting flange 1311 is greater than the minimum diameter of the through hole 1231.

[0150] 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 toward 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 a position with a smaller diameter (the position where the diameter of the limiting flange 1311 is larger than the diameter of the through hole 1231), the limiting flange 1311 compresses the hole wall of the through hole 1231. Under the driving force of the compressive force, the elastic deformation structure undergoes elastic deformation (the deformation gap 1232 increases), which causes the through hole 1231 to be opened and its diameter to be increased to meet the passage requirement of the limiting flange 1311. When the limiting flange 1311 is removed from the through hole 1231, the elastic deformation structure resets, and the opened through hole 1231 returns to its original diameter. The diameter of the reset through hole 1231 is no longer sufficient for the limiting flange 1311 to pass through in the opposite direction from the main body 141 to the first end cap assembly 13, so that the limiting flange 1311 is limited within the first hole segment 1211 between the elastic deformation structure and the main body 141.

[0151] When the first end cap assembly 13 and the isolation member 12 are assembled in place, the limiting flange 1311 is engaged with the side of the elastic deformation structure facing the main body 141 and is received by the first hole segment 1211, thereby reducing the possibility of the limiting flange 1311 protruding out of the limiting hole 121, and further reducing the possibility of adverse effects on the main body 141 caused by the limiting flange 1311 protruding out of the limiting hole 121.

[0152] In some embodiments of this application, as shown in Figures 5 and 8, 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 located further away 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 141, the size of the transition hole section 12312 tends to decrease.

[0153] Specifically, in the direction from the first end cap 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. The narrowing can be a continuous structure or an intermittent structure.

[0154] In this application, the transition hole section 12312 and the straight hole section 12311 are connected in sequence. The transition hole section 12312 is disposed facing the first end cap assembly 13, and the straight hole section 12311 is disposed away from the first end cap assembly 13. In the thickness direction a of the separator 12, the transition hole section 12312 includes a large end and a small end, wherein the large end is disposed facing the first end cap assembly 13, and the small end is disposed away from the first end cap assembly 13 and connected to the straight hole section 12311. The diameter of the small end is equal to the diameter of the straight hole section 12311.

[0155] During assembly, when the snap-fit ​​protrusion 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-fit ​​protrusion 131 exits through the straight hole section 12311. The transition hole section 12312 is then provided, thereby guiding the insertion process of the snap-fit ​​protrusion 131, improving the convenience of assembly, and effectively improving the efficiency of assembly.

[0156] In some embodiments of this application, as shown in Figures 5, 10, 11 and 12, the snap-fit ​​protrusion 131 further includes a connecting post 1312, and the limiting flange 1311 is connected to the first end cap assembly 13 through the connecting post 1312, at least a portion of the connecting post 1312 is received in the through hole 1231.

[0157] Specifically, one end of the connecting post 1312 is connected to the limiting flange 1311, and the other end of the connecting post 1312 is connected to the first end cap assembly 13. The connecting post 1312 is perpendicular to or at an acute angle to the first end cap assembly 13.

[0158] When the first end cap assembly 13 is assembled, one end of the connecting post 1312 with a limiting flange 1311 is inserted into the limiting hole 121 and moves along the limiting hole 121 towards 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 a position with a smaller diameter (the diameter of the limiting flange 1311 is larger than the diameter of the through hole 1231), the limiting flange 1311 compresses the hole wall of the through hole 1231. Under the drive of the compressive force, the elastic deformation structure undergoes elastic deformation (deformation gap 1232). The through hole 1231 is expanded and its diameter is increased to meet the passage requirements of the limiting flange 1311. When the limiting flange 1311 is dislodged from the through hole 1231, the elastic deformation structure is reset, and the expanded through hole 1231 returns to its original diameter. The diameter of the reset through hole 1231 is no longer sufficient for the limiting flange 1311 to pass through in the opposite direction from the main body 141 to the first end cap assembly 13. This results in the limiting flange 1311 being limited within the first hole segment 1211 between the elastic deformation structure and the main body 141. At least a portion of the body of the connecting post 1312 is housed within the through hole 1231.

[0159] The connecting post 1312 is provided so that the limiting flange 1311 is spaced apart from the first end cap assembly 13, so that the limiting flange 1311 can be effectively inserted into the through hole 1231 of the elastic deformation structure and disengaged through the through hole 1231, thereby realizing the snap-fit ​​engagement between the snap-fit ​​protrusion 131 and the elastic deformation structure.

[0160] It should be noted that the limiting flange 1311 and the connecting post 1312 can be integrally formed, or the limiting flange 1311 and the connecting post 1312 can be separate structures and connected and fixed by welding or bonding.

[0161] In some embodiments of this application, as shown in Figures 5, 10, 11 and 12, the connecting post 1312 includes a first connecting portion 13121, which is connected to a 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 segment 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 segment 12311 along the first direction b. The first direction b is perpendicular to the thickness direction a of the spacer 12.

[0162] Specifically, after the limiting flange 1311 is dislodged from the elastic deformation structure, the limiting flange 1311 is located on the side of the elastic deformation structure facing the main body 141, and the first connecting part 13121 is located in the through hole 1231.

[0163] 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 undergo elastic deformation when the limiting flange 1311 passes through the straight hole section 12311, and recover elastic deformation when the limiting flange 1311 comes out. The elastic deformation structure that recovers elastic deformation limits the limiting flange 1311, reducing the possibility of the limiting flange 1311 falling off in the reverse direction (from the main body portion 141 to the first end cap assembly 13), thereby improving the structural stability of the connection position.

[0164] In some embodiments of this application, 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.

[0165] Specifically, the connecting post 1312 includes a first connecting portion 13121, which is connected to a 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. 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.

[0166] The first connecting part 13121 is a first cylindrical structure with two oppositely arranged ends. One end is connected to the first end cap assembly 13, and the other end is disposed away from the first end cap assembly 13 and connected to the limiting flange 1311. The diameter of the first connecting part 13121 is the first diameter d1, the maximum diameter of the limiting flange 1311 is the second diameter d2, and the minimum diameter of the limiting hole 121 is the third diameter d3. 0.8 mm ≤ first diameter d1 ≤ 3 mm, first diameter d1 ≤ third diameter d3, and the difference between the second diameter d2 and the third diameter d3 is ≥ 0.2 mm.

[0167] When the first end cap assembly 13 is assembled, the end of the snap-fit ​​protrusion 131 with the limiting flange 1311 is positioned facing the limiting hole 121, so that the end of the snap-fit ​​protrusion 131 with the limiting flange 1311 is inserted into the limiting hole 121 and the first end cap assembly 13 is pushed along the thickness direction a of the spacer 12 by external force. 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, due to... The limiting flange 1311 compresses the inner wall of the limiting hole 121, increasing the deformation gap 1232 and thus increasing the diameter of the limiting hole 121 to meet the need for the limiting flange 1311 to pass through. After installation, the limiting flange 1311 is dislodged through the limiting hole 121 and placed on the side of the limiting protrusion 123 away from the first end cap assembly 13. The deformation gap 1232 recovers its elastic deformation and can no longer meet the need for the limiting flange 1311 to pass through. The first connecting part 13121 passes through the limiting hole 121.

[0168] The limiting flange 1311 is connected to the first end cap assembly 13 via the first connecting part 13121, so that the limiting flange 1311 and the first end cap assembly 13 are spaced apart in the thickness direction a of the separator 12. By setting the size of the first connecting part 13121, the minimum diameter of the limiting hole 121 and the diameter of the first connecting part 13121, the limiting flange 1311 can effectively cooperate with the limiting hole 121, thereby realizing the effective assembly of the first end cap assembly 13.

[0169] It is important to understand that the larger the difference between the second diameter d2 and the third diameter d3, the greater the compressive force exerted by the limiting flange 1311 on the inner wall of the limiting hole 121 when it passes through the limiting hole 121, resulting in a greater elastic deformation of the deformation gap 1232. Specifically, 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, or 2 mm.

[0170] In addition, by setting the first diameter d1 of the first connecting part 13121 between 0.8 mm and 3 mm, the volume of the first connecting part 13121 can be effectively controlled, reducing the space occupied by the first connecting part 13121 in the internal space of the housing 11, thereby effectively improving the space utilization rate inside the housing 11.

[0171] The specific value 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, or 3 mm.

[0172] Furthermore, by setting the dimensions 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 possibility of the first connecting portion 13121 breaking under stress can be reduced.

[0173] In some embodiments of this application, as shown in Figures 5, 10, 11 and 12, the connecting post 1312 further includes a transition connection portion 13122. The first connecting portion 13121 is connected to the first end cap assembly 13 through the transition connection portion 13122. At least a portion of the transition connection portion 13122 passes through 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 connection portion 13122 decreases along the first direction b.

[0174] Specifically, in this application, the decreasing trend in size of the transition connection portion 13122 along the first direction b in the direction from the first end cap assembly 13 to the main body 141 means that the size of the transition connection portion 13122 in the first direction b is reduced in the direction from the first end cap 134 to the main body 141, that is, the transition connection portion 13122 is narrowed along the direction from the first end cap assembly 13 to the main body 141. The narrowing can be a continuous structure or an intermittent structure.

[0175] In this application, the transition connection 13122 is sequentially connected to the first connection 13121. In the thickness direction a of the isolation member 12, the transition connection 13122 includes a large end and a small end. The large end is connected to the first end cap assembly 13, and the small end is disposed away from the first end cap assembly 13 and connected to the first connection 13121. The diameter of the small end is equal to the diameter of the first connection 13121.

[0176] The transition connection portion 13122 is provided to increase the structural strength of the snap-fit ​​protrusion 131 and further reduce the possibility of the snap-fit ​​protrusion 131 breaking during assembly.

[0177] In some embodiments of this application, as shown in Figures 5, 10, 11 and 12, the connecting post 1312 further includes a second connecting portion 13123, the transition connecting portion 13122 is connected to the first end cap assembly 13 through the second connecting portion 13123, and the second connecting portion 13123 is accommodated in the second hole section 1212.

[0178] Specifically, in the direction from the first end cap assembly 13 to the main body 141, the size of the transition connection portion 13122 decreases along the first direction b. The end of the transition connection portion 13122 facing the first end cap assembly 13 is the large end, and the end of the transition connection portion 13122 facing the main body 141 is the small end. The first connection portion 13121 and the second connection portion 13123 are respectively connected to opposite ends of the transition connection portion 13122. The first connection portion 13121 is connected to the small end of the transition connection portion 13122 and has the same diameter as the small end. The second connection portion 13123 is connected to the large end of the transition connection portion 13122 and has the same diameter as the large end.

[0179] When the first end cap assembly 13 is assembled, the snap-fit ​​protrusion 131 is positioned facing the limiting hole 121, so that one end of the snap-fit ​​protrusion 131 with the limiting flange 1311 is inserted into the second straight hole section 12311 of the limiting hole 121. The first end cap assembly 13 is pushed by the thickness direction a of the external force isolator 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, the deformation gap 1232 becomes smaller and the diameter of the limiting hole 121 increases, so as to meet the insertion requirements of the limiting flange 1311.

[0180] When the snap-fit ​​protrusion 131 and the limiting protrusion 123 are assembled in place, the limiting flange 1311 disengages through the limiting hole 121 and abuts against the side of the limiting flange 1311 away from the first end cap assembly 13. The deformation gap 1232 restores its elastic deformation and restricts the limiting flange 1311 from disengaging in the opposite direction (from the main body 141 to the first end cap 134). The first connecting part 13121 is inserted into the straight hole section 12311, the through hole 122 connecting part is inserted into the transition hole section 12312, and the second connecting part 13123 is inserted into the second straight hole section 12311.

[0181] The limiting flange 1311 engages with the side of the elastic deformation structure facing the main body 141 to limit the first end cap assembly 13 in the thickness direction a of the spacer 12. Simultaneously, the engagement of the second straight hole section 12311 with the second connecting portion 13123 allows for further limiting of the first end cap assembly 13 in the first direction b, reducing the possibility of movement of the locking protrusion 131 relative to the spacer 12 in the first direction b and further improving the assembly accuracy of the first end cap assembly 13.

[0182] In some embodiments of this application, as shown in Figures 8 and 12, the wall of the transition hole section 12312 has a first included angle a1 with the central axis of the through hole 1231, and the outer peripheral surface of the transition connection part 13122 has a second included angle a2 with the central axis of the connecting post 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 consistent with the direction of the central axis of the connecting post 1312.

[0183] Specifically, when the first included angle a1 is less than the second included angle a2, the outer peripheral surface of the transition connection portion 13122 is spaced apart from the hole wall of the transition hole section 12312, and when the first included angle a1 is equal to the second included angle a2, the outer peripheral surface of the transition connection portion 13122 is in contact with the hole wall of the transition hole section 12312.

[0184] 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 manufacturing tolerance and other factors on assembly, and enabling the assembly operation to be carried out effectively.

[0185] It should be noted that in this application, the transition hole section 12312 is a first frustum structure. By setting the transition hole section 12312 as a first frustum structure, the inner wall structure of the transition hole section 12312 can be made more continuous, which can improve the smoothness of the movement of the limiting flange 1311 of the snap-fit ​​protrusion 131 along the inner wall of the transition hole section 12312 and reduce the assembly difficulties caused by jamming.

[0186] In addition, the transition connection 13122 has a second frustum structure. By setting the transition connection 13122 to a second frustum structure, the structure of the transition connection 13122 can be made more continuous, making the processing more convenient and effectively improving the processing efficiency.

[0187] In some embodiments of this application, the first included angle a1 is greater than or equal to 20 degrees and less than or equal to 75 degrees.

[0188] Specifically, by setting the first included angle a1, the ease of processing is improved while simultaneously guiding the snap-fit ​​protrusion 131.

[0189] It should be noted that the specific values ​​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, and 75 degrees.

[0190] In some embodiments of this application, the second tilt angle is greater than or equal to 20 degrees and less than or equal to 75 degrees.

[0191] Specifically, by setting the second included angle a2, the transition connection 13122 can effectively adapt to the structure of the transition hole section 12312, thereby enabling effective assembly.

[0192] It should be noted that the specific values ​​of the second included 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, and 75 degrees.

[0193] In some embodiments of this application, as shown in Figures 5, 10, 11 and 12, the limiting flange 1311 decreases in thickness direction a along the partition plate 124.

[0194] Specifically, the decreasing trend of the limiting flange 1311 along the thickness direction a of the partition plate 124 means that the size of the transition hole section 12312 in the first direction b of the direction from the first end cap assembly 13 to the main body 141 is decreasing, that is, the transition hole section 12312 is narrowed. The narrowing can be a continuous structure or an intermittent structure.

[0195] In this application, by setting the limiting flange 1311 so that the side of the limiting flange 1311 away from the first end cap assembly 13 is narrowed, it is easier for the limiting flange 1311 to be inserted into the limiting hole 121, thereby improving the ease of assembly.

[0196] It should be noted that, in this application, the maximum diameter of the limiting flange 1311 is greater than the diameter of the straight hole section 12311 of the through hole 1231, so that during the process of the limiting flange 1311 passing through the limiting hole 121, the limiting flange 1311 drives the limiting hole 121, so that the elastic deformation structure undergoes elastic deformation 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 be dislodged through the limiting hole 121.

[0197] Furthermore, in this application, the limiting flange 1311 has a frustum-shaped or mushroom-shaped structure. This shape of the limiting flange 1311 improves the ease of processing.

[0198] In some embodiments of this application, as shown in Figures 5 to 9, there are multiple deformation gaps 1232, which are spaced apart along the circumferential direction of the limiting hole 121.

[0199] Specifically, by setting multiple deformation gaps 1232, the elastic deformation capability of the elastic deformation structure is improved, thereby improving the convenience of inserting the snap-fit ​​protrusion 131 with the limiting flange 1311 into the limiting hole 121, and effectively improving the assembly efficiency.

[0200] It should be noted that the multiple deformation gaps 1232 can be set at equal intervals or unequal intervals in the circumferential direction of the card hole.

[0201] In some embodiments of this application, the deformation gap 1232 has a straight or curved structure.

[0202] Specifically, by setting the shape of the deformation gap 1232, the deformation gap 1232 can be set according to the requirements, thereby meeting the needs of production.

[0203] In some embodiments of this application, the size of the deformation gap 1232 along the circumferential direction of the limiting hole 121 is greater than or equal to 0.3 mm and less than or equal to 1.5 mm.

[0204] Specifically, by setting the dimensions 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 properties, reducing the occurrence of the snap-fit ​​protrusion 131 falling off.

[0205] It should be noted that, in this application, as shown in Figure 6, the size of the deformation gap 1232 along the circumferential direction of the limiting hole 121 is the width p of the deformation gap 1232. The value of the width 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, or 1.5 mm.

[0206] In some embodiments of this application, as shown in Figures 6, 7 and 9, the isolation member 12 further includes an isolation plate 124, and a limiting protrusion 123 is provided on the side of the isolation member 12 facing the first end cap assembly 13.

[0207] Specifically, the isolation member 12 is disposed between the first end cap assembly 13 and the main body 141 of the electrode assembly 14, and the isolation plate 124 of the isolation member 12 is disposed between the first end cap assembly 13 and the main body 141. The isolation plate 124 is used to block the first end cap assembly 13 and the main body 141, thereby improving the barrier performance.

[0208] In addition, by protruding the limiting protrusion 123 on the side of the separator 12 facing the first end cap assembly 13, the number of cases where the side of the separator 12 facing the main body 141 has a protruding structure is reduced, thereby reducing the occurrence of the main body 141 being punctured due to the protruding structure on the separator 12, and thus effectively improving the safety performance of the battery cell 10.

[0209] It should be noted that the limiting protrusion 123 can be integrally formed with the isolation plate 124, or it can be a separate structure and fixed to the isolation plate 124 by means of bonding or welding.

[0210] In some embodiments of this application, as shown in Figures 5, 6 and 9, the isolation member 12 further includes a side plate 125, which surrounds the circumference of the isolation plate 124 and is connected to the isolation plate 124. The end of the side plate 125 facing the main body 141 is flush with the end of the isolation plate 124 facing the main body 141.

[0211] Specifically, the side plate 125 can be arranged in a ring shape, such as a circular ring, a rectangle or other irregular shape, as is the case in the embodiments of this application.

[0212] The side plate 125 surrounds the outside of the partition plate 124 and protrudes from the side of the partition plate 124 opposite to the main body 141, so that the partition plate 124 and the side plate 125 can together define a receiving recess that can accommodate at least a portion of the tab 142 to improve the compactness of the structure.

[0213] In some embodiments of this application, as shown in Figures 6 and 9, the isolation member 12 further includes a reinforcing structure 126, which is connected to the partition, the limiting protrusion 123 and the side plate 125 respectively.

[0214] Specifically, a reinforcing structure 126 is provided, thereby improving the connection strength between the limiting protrusion 123 and the isolation plate 124 and reducing the possibility of the limiting protrusion 123 breaking relative to the isolation plate 124.

[0215] It should be noted that the reinforcing structure 126 can be elongated, for example, a straight elongated strip.

[0216] In some embodiments of this application, as shown in Figures 6 and 9, there are multiple reinforcing structures 126, which are spaced apart along the circumferential direction of the limiting protrusion 123.

[0217] Specifically, multiple reinforcing structures 126 are provided to further improve the structural strength of the limiting protrusion 123 and further reduce the possibility of the limiting protrusion 123 breaking relative to the isolation plate 124.

[0218] In some embodiments of this application, as shown in Figures 10 to 12, 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 disposed on the first end cap 134. The insulating member 135 includes an insulating body and a snap-fit ​​protrusion 131. The insulating body is disposed on the side of the first end cap 134 facing the main body portion 141, and the snap-fit ​​protrusion 131 is fixed to the side of the insulating body facing the main body portion 141.

[0219] Specifically, the snap-fit ​​protrusion 131 is connected to the insulating member 135. The snap-fit ​​protrusion 131 and the insulating member 135 can be connected perpendicularly or at an acute angle. In addition, the snap-fit ​​protrusion 131 and the insulating member 135 can be an integral structure or a separate structure, and are connected by welding or bonding.

[0220] The first end cap 134 is connected to the insulating member 135. The connection between the two is not limited to snap-fitting, bonding, or connection through a connector. The insulating member 135 is used to isolate the first end cap and the electrode assembly 14.

[0221] The first electrode lead-out member 17 is disposed on the first cover plate, and the electrode tab 142 of the electrode assembly 14 passes through the through hole 1231 of the insulating member 12 and is connected to the first electrode lead-out member 17.

[0222] The first cover plate can be made of metal and be conductive, while the insulating component 135 can be made of plastic.

[0223] In this application, the first end cap assembly 13 is configured to effectively insulate the first cover plate while ensuring that the first end cap assembly 13 is connected and fixed to the separator 12, thereby further improving the insulation performance of the battery cell 10.

[0224] In some embodiments of this application, the housing 11 also has a second opening opposite to the first opening, and the battery cell 10 also includes a second end cap assembly 15 for covering the second opening.

[0225] Specifically, the first end cap assembly 13 and the second end cap assembly 15 are used to cover the first opening and the second opening at both ends of the housing 11, thereby facilitating the sealing of the housing 11.

[0226] Optionally, the second end cap assembly 15 is not provided with electrode terminals, only the first end cap assembly 13 is provided with electrode terminals, and the electrode assembly 14 enters the housing 11 through the second opening.

[0227] 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. 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 snap-fit ​​protrusion 131, or the second end cap assembly 15 may have a different structure from the first end cap assembly 13.

[0228] The battery cell 10 may also 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.

[0229] Additionally, as shown in Figure 10, the first end cap assembly 13 is provided with an injection hole 132, which is connected to the interior of the housing 11 to inject electrolyte into the interior of the housing 11. By providing an injection hole 132 on the first end cap assembly 13, electrolyte can be injected into the housing 11 through the injection hole 132, thereby improving the convenience of electrolyte injection.

[0230] Additionally, as shown in Figure 10, a baffle 133 is provided on the first end cap assembly 13. The baffle 133 is located on the side of the first end cap assembly 13 facing the support member and is opposite to the liquid injection hole 132. The baffle 133 is used to block the liquid injection hole 132 to reduce the amount of foreign matter entering the battery cell 10 through the liquid injection hole 132.

[0231] A second aspect of this application provides a battery 100 comprising a battery cell 10 as described above.

[0232] When assembling the battery cell 10 in the battery 100, the separator 12 is placed inside the housing 11, and then the snap-fit ​​protrusion 131 of the first end cap assembly 13 is inserted into the limiting hole 121 of the limiting protrusion 123. As the snap-fit ​​protrusion 131 is gradually inserted, it enters the through hole 1231 of the elastic deformation structure. When the snap-fit ​​protrusion 131 passes through the through hole 1231, the elastic deformation structure undergoes elastic deformation so that the snap-fit ​​protrusion 131 can engage with the elastic deformation structure. By providing an elastic deformation structure on the separator 12, the snap-fit ​​protrusion 131 does not need to have a deformation structure to meet the assembly requirements, thereby improving the structural strength of the snap-fit ​​protrusion 131 and reducing the possibility of breakage during assembly.

[0233] A third aspect of this application provides an electrical device comprising the battery 100 as described above.

[0234] In electrical equipment, when assembling the battery cell 10 in the battery 100, the separator 12 is placed inside the housing 11, and then the snap-fit ​​protrusion 131 of the first end cap assembly 13 is inserted into the limiting hole 121 of the limiting protrusion 123. As the snap-fit ​​protrusion 131 is gradually inserted, it enters the through hole 1231 of the elastic deformation structure. When the snap-fit ​​protrusion 131 passes through the through hole 1231, the elastic deformation structure undergoes elastic deformation so that the snap-fit ​​protrusion 131 can engage with the elastic deformation structure. By providing an elastic deformation structure on the separator 12, the snap-fit ​​protrusion 131 can meet the assembly requirements without the need for a deformation structure, thereby improving the structural strength of the snap-fit ​​protrusion 131 and reducing the possibility of breakage during assembly.

[0235] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0236] In the embodiments of this application, as shown in Figures 3 to 12, this application proposes 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, and the first end cap assembly 13 is used to cover the first opening. The first end cap assembly 13 includes a snap-fit ​​protrusion 131 and a first electrode lead-out member 17. The electrode assembly 14 is housed within the housing 11 and includes a main body portion 141 and an electrode tab 142 extending from the main body portion 141. At least a portion of the separator 12 is disposed between the first electrode lead-out member 17 and the main body portion 141. The electrode 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, and a limiting hole 121 is formed on the limiting protrusion 123. The limiting hole 121 is formed along the thickness direction a of the separator 12. An elastic deformation structure is provided on the hole wall of the limiting hole 121, and the snap-fit ​​protrusion 131 engages with the elastic deformation structure. The elastic deformation structure includes a through hole 1231, which is connected to a limiting hole 121. The elastic deformation structure is configured to undergo elastic deformation when the snap-fit ​​protrusion 131 is inserted into the limiting hole 121 and passes through the through hole 1231.

[0237] Specifically, the elastic deformation structure is a cylindrical structure. The interior of the cylindrical structure has a through hole 1231, and a deformation slot 1232 is formed on the cylindrical structure. A gap exists between the outer peripheral surface of the elastic deformation structure and the wall of the limiting hole 121. The gap between the outer peripheral surface of the elastic deformation structure and the wall of the limiting hole 121 increases along the direction from the first end cap assembly 13 to the main body 141. The cylindrical structure extends obliquely along the direction from the first end cap assembly 13 to the main body 141. The snap-fit ​​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 disengages from the through hole 1231, the deformation gap 1232 resets and the diameter of the through hole 1231 resets. The limiting flange 1311 snaps onto the side of the elastic deformation structure facing the main body 141. The end of the elastic deformation structure facing the main body 141 is spaced apart from the main body 141, the limiting flange 1311 is disposed between the elastic deformation structure and the main body 141, and the distance between the limiting flange 1311 and the main body 141 is greater than or equal to zero. The limiting hole 121 includes a first hole segment 1211 and a second hole segment 1212, which are located on opposite sides of the elastic deformation structure. The first hole segment 1211 is positioned closer to the main body 141 than the second hole segment 1212. The diameter of the first hole segment 1211 is larger than the diameter of the second hole segment 1212. The first hole segment 1211 has a rounded transition with the elastic deformation structure. The snap-fit ​​protrusion 131 includes a limiting flange 1311, which snaps onto the side of the elastic deformation structure facing the main body 141 and is completely accommodated within the first hole segment 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 located further away 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 141, the size of the transition hole section 12312 decreases. The limiting flange 1311 is connected to the first end cap assembly 13 via a connecting post 1312, at least a portion of which is received in the through hole 1231. The connecting post 1312 includes a first connecting portion 13121, which is connected to a 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. Along the first direction b, the dimension of the first connecting portion 13121 is greater than or equal to 0.8 mm and less than or equal to 3 mm.The connecting post 1312 also includes a transition connecting portion 13122. The first connecting portion 13121 is connected to the first end cap assembly 13 via the transition connecting portion 13122. At least a portion of the transition connecting portion 13122 passes through the transition hole section 12312. In the direction from the first end cap assembly 13 to the main body 141, the size of the transition connecting portion 13122 decreases along the first direction b. The connecting post 1312 also includes a second connecting portion 13123. The transition connecting portion 13122 is connected to the first end cap assembly 13 via the second connecting portion 13123. The second connecting portion 13123 is accommodated within the second hole section 1212. The transition hole section 12312 has a first included angle α1 between its wall and the central axis of the through hole 1231, and the outer peripheral surface of the transition connection part 13122 has a second included angle α2 between its outer peripheral surface and the central axis of the connecting post 1312. The first included angle α1 is less than or equal to the second included angle α2, wherein the direction of the central axis of the through hole 1231 is consistent with the direction of the central axis of the connecting post 1312. The first included angle α1 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 α of the partition plate 124, the surface of the limiting flange 1311 tends to decrease. There are multiple deformation gaps 1232, which are spaced apart along the circumferential direction of the limiting hole 121. The deformation gaps 1232 have a straight or curved structure. 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. The isolation member 12 also includes an isolation plate 124, with a limiting protrusion 123 protruding from the side of the isolation member 12 facing the first end cap assembly 13. The isolation member 12 also includes a side plate 125, which surrounds and is connected to the isolation plate 124 circumferentially, with one end of the side plate 125 facing the main body 141 flush with the end of the isolation plate 124 facing the main body 141. The isolation member 12 also includes reinforcing structures 126, which are connected to the isolation plate, the limiting protrusion 123, and the side plate 125. Multiple reinforcing structures 126 are provided, spaced apart along the circumferential direction of the limiting protrusion 123. The first end cap assembly 13 also includes a first end cap 134 and an insulating member 135. A first electrode lead-out member 17 is disposed on the first end cap 134. The insulating member 135 includes an insulating body and a snap-fit ​​protrusion 131. The insulating body is disposed on the side of the first end cap 134 facing the main body portion 141, and the snap-fit ​​protrusion 131 is fixed to the side of the insulating body facing the main body portion 141. The housing 11 also has a second opening opposite to the first opening. The battery cell 10 also includes a second end cap assembly 15, which is used to cover the second opening.

[0238] Specifically, during assembly, the isolator 12 is placed inside the housing 11, and then the snap-fit ​​protrusion 131 of the first end cap assembly 13 is inserted into the limiting hole 121 of the limiting protrusion 123. As the snap-fit ​​protrusion 131 is gradually inserted, it enters the through hole 1231 of the elastic deformation structure. When the snap-fit ​​protrusion 131 passes through the through hole 1231, the elastic deformation structure undergoes elastic deformation, allowing the snap-fit ​​protrusion 131 to engage with the elastic deformation structure. By providing an elastic deformation structure on the isolator 12, the snap-fit ​​protrusion 131 can meet the assembly requirements without the need for a deformation structure, thereby improving the structural strength of the snap-fit ​​protrusion 131 and reducing the possibility of breakage during assembly.

[0239] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling 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, the first end cap assembly being used to cover the first opening, the first end cap assembly including a snap-fit ​​protrusion and a first electrode lead-out; An electrode assembly, the electrode assembly being housed within the housing, the electrode assembly including a main body and tabs extending from the main body; An isolator, at least a portion of which is disposed between the first electrode lead and the main body, wherein the electrode tab passes through the isolator and is electrically connected to the first electrode lead, the isolator includes a limiting protrusion, 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 wall of the limiting hole, wherein the snap-fit ​​protrusion snaps into the elastic deformation structure; The elastic deformation structure includes a through hole that communicates with the limiting hole. The elastic deformation structure is configured to undergo elastic deformation when the snap-fit ​​protrusion is inserted into the limiting hole and passes through the through hole.

2. The battery cell as described in claim 1, characterized in that, The elastic deformation structure is a cylindrical structure, the interior of the cylindrical structure forms the through hole, the cylindrical structure has a deformation slit, and there is a gap between the outer peripheral surface of the elastic deformation structure and the wall of the limiting hole.

3. The battery cell as described in claim 2, characterized in that, The gap between the outer peripheral surface of the elastic deformation structure and the wall of the limiting hole tends to increase along the direction from the first end cap assembly to the main body; and / or the cylindrical structure extends obliquely along the direction from the first end cap assembly to the main body.

4. The battery cell as described in claim 2 or 3, characterized in that, The snap-fit ​​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. After the limiting flange disengages from the through hole, the deformation gap resets and the diameter of the through hole resets. The limiting flange snaps onto the side of the elastic deformation structure facing the main body.

5. The battery cell as described in claim 4, characterized in that, The end of the elastic deformation structure facing the main body is spaced apart from the main body, the limiting flange is disposed between the elastic deformation structure and the main body, and the distance between the limiting flange and the main body is greater than or equal to zero.

6. The battery cell according to any one of claims 1-5, characterized in that, The limiting hole includes a first hole segment and a second hole segment, the first hole segment and the second hole segment are located on opposite sides of the elastic deformation structure, and the first hole segment is disposed closer to the main body than the second hole segment; The diameter of the first hole segment is larger than the diameter of the second hole segment.

7. The battery cell as described in claim 6, characterized in that, The first hole segment and the elastic deformation structure have a circular arc transition.

8. The battery cell according to any one of claims 6-7, characterized in that, The snap-fit ​​protrusion includes a limiting flange, which snaps onto the side of the elastic deformation structure facing the main body, and the limiting flange is completely accommodated in the first hole segment.

9. The battery cell as described in claim 8, characterized in that, 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 located further away from the first end cap 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 cap assembly to the main body, the size of the transition hole section decreases.

10. The battery cell as described in claim 9, characterized in that, The snap-fit ​​protrusion further includes a connecting post, and the limiting flange is connected to the first end cap assembly through the connecting post. At least a portion of the connecting post is received in the through hole.

11. The battery cell as described in claim 10, characterized in that, The connecting post includes a first connecting portion connected to the limiting flange. The dimension of the first connecting portion along the first direction is less than or equal to the dimension of the straight hole segment along the first direction. The dimension of the limiting flange along the first direction is greater than the dimension of the straight hole segment along the first direction. The first direction is perpendicular to the thickness direction of the separator.

12. The battery cell as described in claim 11, characterized in that, 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 as described in claim 11 or 12, characterized in that, The connecting post further includes a transition connection portion, through which the first connecting portion is connected to the first end cap assembly. At least a portion of the transition connection portion passes through the transition hole section. In the direction from the first end cap assembly to the main body, the size of the transition connection portion decreases along a first direction.

14. The battery cell as described in claim 13, characterized in that, The connecting post further includes a second connecting portion, which is connected to the first end cap assembly via the second connecting portion, and the second connecting portion is accommodated within the second hole segment.

15. The battery cell according to any one of claims 9-14, characterized in that, The transition hole section has a first included angle between its hole wall and the central axis of the through hole, and the outer peripheral surface of the transition connection has a second included angle between its outer peripheral surface 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 consistent with the direction of the central axis of the connecting column.

16. The battery cell as described in claim 15, characterized in that, The first included angle is greater than or equal to 20 degrees and less than or equal to 75 degrees; And / or, the second tilt angle is greater than or equal to 20 degrees and less than or equal to 75 degrees.

17. The battery cell as described in claim 4 or 8, characterized in that, Along the thickness direction of the partition plate, the limiting flange tends to decrease in size.

18. The battery cell according to any one of claims 2 to 5, characterized in that, The number of deformation gaps is multiple, and the multiple deformation gaps are spaced apart along the circumferential direction of the limiting hole.

19. The battery cell according to any one of claims 2 to 5, characterized in that, The deformation gap has a straight or curved structure.

20. The battery cell according to any one of claims 2 to 5, characterized in that, 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 any one of claims 1 to 20, characterized in that, The isolation component also includes an isolation plate, and the limiting protrusion protrudes from the side of the isolation component facing the first end cap assembly.

22. The battery cell as described in claim 21, characterized in that, The isolation component also includes a side plate, which surrounds the circumference of the isolation plate and is connected to the isolation plate. The end of the side plate facing the main body is flush with the end of the isolation plate facing the main body.

23. The battery cell as described in claim 22, characterized in that, The isolation component also includes a reinforcing structure, which is connected to the partition, the limiting protrusion and the side plate respectively.

24. The battery cell as described in claim 23, characterized in that, The number of the reinforcing structures is multiple, and the multiple reinforcing structures are spaced apart 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 cap assembly also includes a first end cap and an insulating member. The first electrode lead is disposed on the first end cap. The insulating member includes an insulating body and a snap-fit ​​protrusion. The insulating body is disposed on the side of the first end cap facing the main body, and the snap-fit ​​protrusion is fixed to the side of the insulating body facing the main body.

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

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

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

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