Single cell and battery pack

Abstract

This application provides a single battery cell and a battery pack. The single battery cell has a first orientation and includes a top cover assembly. The top cover assembly includes: a top cover sheet, which includes a top cover body and a connecting portion, a flanged portion, and a supporting portion, all arranged in annular shapes. The connecting portion is connected to the top cover body, and the flanged portion and the supporting portion are respectively connected to both sides of the connecting portion in the first orientation to form an annular groove; a first terminal, which passes through the top cover body; an adhesive-coated structure, which is sleeved between the first terminal and the connecting portion, with at least a portion of the adhesive-coated structure located within the annular groove; and a sealing ring, which is sleeved between the first terminal and the supporting portion and is elastic. The top cover sheet also includes a first reinforcing portion, which is connected to the connecting portion and the top cover body and is located on the side of the connecting portion opposite to the annular groove. The first reinforcing portion can disperse and counteract the reaction force of the sealing ring on the supporting portion, ensuring that the sealing ring always maintains a stable sealing state.

Description

Technical Field

[0001] This application belongs to the field of battery cell technology, specifically relating to a single cell and a battery pack. Background Technology

[0002] The top cover of a single battery cell has terminals that are electrically connected to the electrode assembly to output current. At least one of the positive and negative terminals needs to be insulated from the top cover to prevent short circuits. A common method is to use a sealing ring between the terminal and the top cover, achieving insulation through the sealing ring's insulating properties.

[0003] However, the sealing ring is elastic. While this elasticity allows for a better seal between the terminal and the top cover plate by compressing the sealing ring, the force generated by this elasticity also acts on the top cover plate, causing deformation of the part of the top cover plate surrounding the terminal. This results in a decrease or even failure of the sealing and insulation performance of the sealing ring. Utility Model Content

[0004] This application provides a single battery cell and a battery pack to solve the problem that the force exerted by the sealing ring on the top cover sheet causes deformation of the top cover sheet, which in turn leads to a decrease in the sealing performance of the battery.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a single-cell battery having a first orientation, including a top cover assembly, the top cover assembly comprising:

[0007] The top cover sheet includes a top cover body and a connecting portion, a flange portion, and a supporting portion, all of which are arranged in annular shapes. The connecting portion is connected to the top cover body, and the flange portion and the supporting portion are respectively connected to the two sides of the connecting portion in the first direction to form an annular groove.

[0008] The first terminal is inserted through the top cover body;

[0009] An adhesive-coated structure is sleeved between the first terminal and the connecting portion, with at least a portion of the adhesive-coated structure located within the annular groove;

[0010] A sealing ring, which is sleeved between the first terminal and the support portion, and the sealing ring is elastic;

[0011] The top cover plate also includes a first reinforcing part, which is connected to the connecting part and the top cover body. The first reinforcing part is located on the side of the connecting part away from the annular groove.

[0012] Optionally, a plurality of first reinforcing portions are provided, and the plurality of first reinforcing portions are arranged at intervals along the circumference of the connecting portion.

[0013] Optionally, the overmolded structure has a first part, a second part, and a third part, the third part connecting the first part and the second part. In the first direction, the first part is located between the first terminal and the flange, the second part is located between the first terminal and the support part, and the third part is located between the first terminal and the connecting part.

[0014] The top cover plate also includes a second reinforcing part, which is located in the annular groove and connects the supporting part and the connecting part.

[0015] Optionally, a plurality of second reinforcing portions are provided, and the plurality of second reinforcing portions are spaced apart along the circumferential direction of the connecting portion.

[0016] Optionally, the two reinforcing parts are arranged in a ring shape, and the second reinforcing part has a first surface facing the overmolded structure, the first surface being a chamfered right angle surface or a rounded corner surface.

[0017] Optionally, the overmolded structure has a first mating surface that matches the first surface.

[0018] Optionally, the first terminal has a body portion and a protrusion portion, the body portion passing through the top cover body, and the protrusion portion surrounding the body portion circumferentially;

[0019] The sealing ring is located on the outer periphery of the body portion. The third part, the first part, and the second part cooperate to form an enclosing groove. At least a portion of the protrusion is located within the enclosing groove, and the first part and the second part are located on opposite sides of the protrusion in the first direction. The protrusion is provided with a chamfer, and the position of the chamfer corresponds to the connection position of the second part and the third part.

[0020] Optionally, the sealing ring includes a fourth part and a fifth part;

[0021] The fourth part is located between the support part and the protrusion, and the fifth part is located between the support part and the body part;

[0022] The support portion is provided with a chamfer, and the position of the chamfer corresponds to the connection position of the fourth part and the fifth part.

[0023] Optionally, the single battery cell further includes a housing and an electrode assembly, the electrode assembly being disposed within the housing, and the top cover being connected to the housing;

[0024] The top cover assembly further includes a second terminal, which passes through the top cover body, and the polarity of the second terminal is opposite to that of the first terminal.

[0025] The electrode assembly includes a body, a first electrode tab, and a second electrode tab. Both the first electrode tab and the second electrode tab are electrically connected to the body, and the first electrode tab is electrically connected to the first terminal, while the second electrode tab is electrically connected to the second terminal.

[0026] Secondly, embodiments of this application provide a battery pack including any of the individual batteries described above.

[0027] In this embodiment, the elastic force of the sealing ring reacts to the first terminal and the overmolded structure, and then to the connecting portion. The first reinforcing portion, directly connected to the connecting portion and the top cover body, and located on the side of the connecting portion away from the annular groove, significantly enhances the structural strength and deformation resistance of the top cover plate surrounding the first terminal area. The first reinforcing portion, through its own structural rigidity, disperses and counteracts the reaction force of the sealing ring on the support portion, effectively suppressing the deformation tendency of the top cover plate and preventing misalignment of the sealing surface and uneven compression of the sealing ring due to deformation of the top cover plate. This ensures that the sealing ring maintains a stable sealing state and provides a reliable sealing effect. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is a schematic diagram of a single battery provided in an embodiment of this application;

[0030] Figure 2 This is an embodiment of the present application. Figure 1 Exploded view;

[0031] Figure 3 This is a schematic diagram of a top cover assembly provided in an embodiment of this application;

[0032] Figure 4 This is an embodiment of the present application. Figure 3 Top view;

[0033] Figure 5 This is an embodiment of the present application. Figure 4 Cross-sectional view of position AA in the middle;

[0034] Figure 6 This is an embodiment of the present application. Figure 5 Enlarged view of section I;

[0035] Figure 7This is a schematic diagram of a top cover sheet provided in an embodiment of this application;

[0036] Figure 8 This is a schematic diagram of an overmolding structure provided in an embodiment of this application;

[0037] Figure 9 This is a schematic diagram of a sealing ring provided in an embodiment of this application.

[0038] Figure label:

[0039] 10. Housing; 20. Electrode assembly; 30. Top cover assembly; 301. Top cover piece; 3011. Top cover body; 3012. Connecting part; 3013. Flanged part; 3014. Support part; 3015. First reinforcing part; 3016. Second reinforcing part; 30161. First surface; 301a. Annular groove; 302. First terminal; 3021. Body part; 3022. Protrusion; 303. Rubber-coated structure; 3031. First part; 3032. Second part; 3033. Third part; 3034. First mating surface; 303a. Enclosing groove; 304. Sealing ring; 3041. Fourth part; 3042. Fifth part; Z. First direction. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0041] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0042] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings, through specific examples and application scenarios.

[0043] This application provides a single-cell battery, as shown in the following embodiments. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 1 This is a schematic diagram of a single battery provided in an embodiment of this application. Figure 2 This is an embodiment of the present application. Figure 1 Exploded view of a single cell in a battery cell. Figure 3 This is a schematic diagram of a top cover assembly provided in an embodiment of this application. Figure 4 This is an embodiment of the present application. Figure 3 Top view, Figure 5 This is an embodiment of the present application. Figure 4 Cross-sectional view at position AA in the middle. Figure 6 This is an embodiment of the present application. Figure 5 Enlarged view of section I in the middle. Figure 7 This is a schematic diagram of a top cover sheet provided in an embodiment of this application; the single cell has a first direction Z, and the single cell includes a top cover assembly 30, the top cover assembly 30 including: a top cover sheet 301, the top cover sheet 301 including a top cover body 3011 and a connecting portion 3012, a flange portion 3013 and a support portion 3014, all arranged in annular shape, the connecting portion 3012 is connected to the top cover body 3011, the flange portion 3013 and the support portion 3014 are respectively connected to both sides of the connecting portion 3012 in the first direction Z and form an annular groove 301a; a first terminal 302, the first terminal 302 is inserted through The top cover body 3011 includes: a rubber-coated structure 303, which is sleeved between the first terminal 302 and the connecting portion 3012, with at least a portion of the rubber-coated structure 303 located within the annular groove 301a; a sealing ring 304, which is sleeved between the first terminal 302 and the support portion 3014 and is elastic; the top cover sheet 301 also includes a first reinforcing portion 3015, which is connected to the connecting portion 3012 and the top cover body 3011, and is located on the side of the connecting portion 3012 opposite to the annular groove 301a.

[0044] A single cell is an energy storage unit with a first direction Z, which is the height direction of the single cell.

[0045] The top cover assembly 30 is an encapsulation and functional component at the top of the battery, comprising the following parts: top cover sheet 301, first terminal 302, encapsulation structure 303, and sealing ring 304.

[0046] The top cover plate 301 is the basic structural component of the top cover assembly 30. It is an overall sheet metal structure and includes: a top cover body 3011, a connecting portion 3012, a flanged portion 3013, a support portion 3014, and a first reinforcing portion 3015. The top cover body 3011 is the main body of the top cover plate 301, serving as a load-bearing and encapsulating component. The connecting portion 3012 is the transition portion between the terminal and the top cover plate 301. The flanged portion 3013 and the support portion 3014 are located on opposite sides of the connecting portion 3012 along the first direction Z. The connecting portion 3012, the flanged portion 3013, and the support portion 3014 together with the connecting portion 3012 form an annular groove 301a. The first reinforcing portion 3015 connects the connecting portion 3012 and the top cover body 3011, located on the side of the connecting portion 3012 opposite to the annular groove 301a, and is used to enhance the structural strength of the top cover plate 301.

[0047] The first terminal 302 is a conductive component that penetrates the top cover body 3011 and is used to output the internal current of the battery.

[0048] The encapsulated structure 303 is a ring structure made of insulating material, which is fitted between the first terminal 302 and the connecting part 3012 and partially embedded in the annular groove 301a, serving as insulation and sealing.

[0049] The sealing ring 304 is an elastic annular seal that is fitted between the first terminal 302 and the support portion 3014, and achieves sealing through elastic deformation.

[0050] The sealing ring 304 forms an initial seal between the first terminal 302 and the support portion 3014 by utilizing elastic deformation, while the annular groove 301a limits the position of the rubber-coated structure 303, which can fix the position of the sealing ring 304 and prevent it from failing due to force displacement. Because the sealing ring 304 is elastic, it generates a reaction force when forming a seal between the first terminal 302 and the support portion 3014. This reaction force can easily cause deformation of the portion of the top cover plate 301 surrounding the terminal, especially the connecting portion 3012 and the surrounding area. The first reinforcing portion 3015 is directly connected to the connecting portion 3012 and the top cover body 3011, and is located on the side of the connecting portion 3012 away from the annular groove 301a. It can use its own structural rigidity to disperse and offset the elastic reaction force of the sealing ring 304, effectively suppressing the deformation tendency of the top cover plate 301, ensuring that the sealing ring 304 always maintains a stable sealing state, and at the same time preventing the position of the encapsulated structure 303 from shifting due to the deformation of the top cover plate 301, thereby ensuring the insulation effect of the encapsulated structure 303, and ultimately maintaining the long-term reliability of the sealing and insulation performance of the top cover assembly 30.

[0051] In addition, the first reinforcing part 3015 is connected to the connecting part 3012 and the top cover body 3011, and is located on the side of the connecting part 3012 away from the annular groove 301a. It can increase the overall strength and rigidity of the top cover piece 301, making the top cover assembly 30 less prone to deformation when subjected to external forces, improving the structural stability of the top cover assembly 30, and helping to extend the battery's service life.

[0052] Optionally, a plurality of first reinforcing parts 3015 are provided, and the plurality of first reinforcing parts 3015 are arranged at intervals along the circumferential direction of the connecting part 3012.

[0053] In one embodiment, a plurality of first reinforcing portions 3015 are provided, and the plurality of first reinforcing portions 3015 are arranged at circumferential intervals along the connecting portion 3012.

[0054] Multiple first reinforcing parts 3015 are distributed circumferentially along the connecting part 3012, which can form multi-point support in the circumferential direction of the connecting part 3012, and more evenly disperse the stress generated by the elastic reaction force of the sealing ring 304. This avoids the deformation of the top cover plate 301 caused by stress concentration in a local area, thereby more comprehensively suppressing the deformation trend of the connecting part 3012 and the surrounding area, and ensuring that the sealing and insulation performance of the sealing ring 304 and the rubber-coated structure 303 are consistent in all positions in the circumferential direction.

[0055] Meanwhile, the spaced arrangement reduces material usage and overall weight of the top cover assembly 30 while ensuring structural strength, without excessively increasing the processing complexity of the top cover piece 301, thus achieving a balance between reinforcement, lightweighting, and manufacturability. Furthermore, the circumferentially spaced first reinforcing parts 3015 enable the top cover piece 301 to have a more balanced resistance to external forces in different directions, improving the structural stability of the top cover assembly 30 under complex stress environments.

[0056] Optionally, refer to Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of a top cover sheet provided in an embodiment of this application. Figure 8 This is a schematic diagram of an encapsulation structure provided in an embodiment of this application; the encapsulation structure 303 has a first part 3031, a second part 3032 and a third part 3033, the third part 3033 connects the first part 3031 and the second part 3032, in the first direction Z, the first part 3031 is located between the first terminal 302 and the flanged part 3013, the second part 3032 is located between the first terminal 302 and the support part 3014, and the third part 3033 is located between the first terminal 302 and the connecting part 3012; the top cover 301 also includes a second reinforcing part 3016, the second reinforcing part 3016 is located in the annular groove 301a, and the second reinforcing part 3016 connects the support part 3014 and the connecting part 3012.

[0057] In some embodiments, the overmolded structure 303 includes a first portion 3031, a second portion 3032, and a third portion 3033. Along the first direction Z, the first portion 3031 is located between the first terminal 302 and the flanged portion 3013, serving as insulation and fixing. The second portion 3032 is located between the first terminal 302 and the support portion 3014, cooperating with the sealing ring 304 to enhance insulation and sealing effects. The third portion 3033 connects the first portion 3031 and the second portion 3032, located between the first terminal 302 and the connecting portion 3012, and is the main insulating layer of the overmolded structure 303, blocking the conductive path between the terminal and the top cover plate 301. The top cover plate 301 also includes a second reinforcing portion 3016, located within the annular groove 301a, directly connecting the support portion 3014 and the connecting portion 3012, serving as a structural reinforcement component for the area of ​​the annular groove 301a.

[0058] The first part 3031, the second part 3032, and the third part 3033 of the encapsulation structure 303 are respectively matched with the contours of the flange 3013, the support part 3014, and the connecting part 3012, forming an all-round insulation barrier between the first terminal 302 and the flange 3013, the support part 3014, and the connecting part 3012 of the top cover plate 301, covering all paths of contact between the terminal and the top cover plate 301, and significantly reducing the risk of short circuit. Among them, the second part 3032 and the sealing ring 304 form a dual guarantee of insulation and sealing in the area of ​​the support part 3014. The insulation is strengthened by the encapsulation structure 303, and the sealing is ensured by the elasticity of the sealing ring 304. The synergistic effect of the encapsulation structure 303 and the sealing ring 304 can improve the reliability of insulation.

[0059] The second reinforcing part 3016 connects the support part 3014 and the connecting part 3012, and can resist the pulling force of the sealing ring 304 on the support part 3014, prevent relative deformation between the support part 3014 and the connecting part 3012, avoid the change in the size of the annular groove 301a causing the rubber-coated structure 303 to loosen or shift, and ensure that the rubber-coated structure 303 always maintains a tight fit with the terminal and the top cover plate 301, maintaining the insulation and sealing effect.

[0060] The first reinforcing part 3015 enhances the connection strength between the top cover body 3011 and the connecting part 3012 from the side of the connecting part 3012 away from the annular groove 301a. The second reinforcing part 3016 strengthens the local structure between the supporting part 3014 and the connecting part 3012. Together, they disperse the elastic reaction force and external stress of the sealing ring 304, further suppressing the overall deformation of the top cover piece 301 in the terminal periphery area, making the compression of the sealing ring 304 more uniform and the position of the rubber-coated structure 303 more stable, ultimately achieving multiple improvements in sealing performance, insulation performance, and structural stability.

[0061] Optionally, a plurality of second reinforcing portions 3016 are provided, and the plurality of second reinforcing portions 3016 are arranged at circumferential intervals along the connecting portion 3012.

[0062] In some embodiments, a plurality of second reinforcing portions 3016 are arranged at circumferential intervals along the connecting portion 3012.

[0063] Since the elastic reaction force of the sealing ring 304 acts on the support part 3014 in the circumferential direction, it may cause local deformation at the connection position between the support part 3014 and the connecting part 3012. The multiple spaced second reinforcing parts 3016 can form multi-point support in the annular groove 301a, which can specifically resist this circumferential stress, avoid deformation or dimensional deviation of the annular groove 301a in local areas, and ensure that the limiting effect of the annular groove 301a on the rubber-coated structure 303 is consistent in the circumferential direction.

[0064] Multiple second reinforcing parts 3016 on the inner side enhance the local structural stability of the annular groove 301a, while multiple first reinforcing parts 3015 on the outer side enhance the overall rigidity of the connecting part 3012 and the top cover body 3011. The first reinforcing parts 3015 and the second reinforcing parts 3016 work together to make the deformation resistance of the top cover piece 301 in the terminal periphery area more balanced, effectively preventing the deformation of the top cover piece 301 caused by local stress concentration, and keeping the insulation and sealing performance of the rubber-coated structure 303 and the sealing ring 304 stable in all circumferential positions.

[0065] In addition, the design of multiple second reinforcing parts 3016 spaced apart can reduce the amount of material used while ensuring the reinforcement effect, avoid excessively increasing the weight and processing difficulty of the top cover 301, and achieve a balance between structural strength, lightweight and manufacturability.

[0066] Optionally, refer to Figure 7 , Figure 7 This is a schematic diagram of a top cover sheet provided in an embodiment of this application. The second reinforcing part 3016 is arranged in a ring shape. The second reinforcing part 3016 has a first surface 30161 facing the adhesive structure 303. The first surface 30161 is a chamfered right angle surface or a rounded corner surface.

[0067] In some embodiments, the second reinforcing portion 3016 is arranged in a ring shape, directly connecting the supporting portion 3014 and the connecting portion 3012 within the annular groove 301a. Specifically, the circumferential direction of the second reinforcing portion 3016 is consistent with the annular contour of the connecting portion 3012, that is, it circles around the connecting portion 3012 with the axis of the first terminal 302 as the center, forming a concentric ring structure with the axis of the first terminal as the center.

[0068] The second reinforcing part 3016, arranged in an annular shape, forms a full-circumference, uniform structural reinforcement at the connection position between the support part 3014 and the connecting part 3012 within the annular groove 301a. This design can more evenly distribute the circumferential stress between the support part 3014 and the connecting part 3012, suppress the overall deformation of the annular groove 301a in all directions, and ensure that the limiting effect of the annular groove 301a on the rubber-coated structure 303 is completely consistent in the circumferential direction, avoiding rubber-coated displacement or sealing failure caused by local structural weakness.

[0069] The first surface 30161 of the second reinforcing part 3016 facing the rubber-coated structure 303 is a chamfered right-angled surface or a rounded corner surface. On the one hand, the smooth transition surface can avoid rigid friction or compression between the rubber-coated structure 303 and the second reinforcing part 3016 during installation or under stress, preventing damage or stress concentration to the rubber-coated structure 303 and ensuring the integrity of its insulation performance. On the other hand, the design of the chamfered right-angled or rounded corner surface can make the contact between the rubber-coated structure 303 and the second reinforcing part 3016 more intimate, reducing the gap between the two. This not only enhances the positioning stability of the rubber-coated structure 303, but also disperses the stress on the rubber-coated structure 303 through the smooth transition of the contact surface, avoiding accelerated aging of the rubber coating due to excessive local stress and extending its service life.

[0070] Optionally, refer to Figure 8 , Figure 8 This is a schematic diagram of an overcoating structure provided in an embodiment of this application. The overcoating structure 303 is provided with a first mating surface 3034, which matches the first surface 30161.

[0071] The first mating surface 3034 matches the first surface 30161 of the chamfered right-angled surface or the rounded corner surface, which allows the rubber-coated structure 303 to form a precise fit and positioning with the second reinforcing part 3016 when it is installed in the annular groove 301a. This avoids installation offset or excessive gap caused by mismatch of the contact surfaces of the two, and also limits the movement of the rubber-coated structure 303 in the annular groove 301a when the battery is subjected to external forces such as vibration and impact. This ensures that the rubber-coated structure 303 is always stably located between the first terminal 302 and the connecting part 3012, providing a basic guarantee for subsequent insulation and sealing functions.

[0072] Since the first surface 30161 is a chamfered right angle or a rounded corner surface, the matching first mating surface 3034 is also a chamfered right angle or a rounded corner surface. The matching contact surfaces can minimize the gap between the rubber-coated structure 303 and the second reinforcing part 3016. In this way, the contact of the two smooth contact surfaces can evenly distribute the stress to a larger contact area, reduce the risk of damage to the rubber-coated structure 303, ensure the long-term integrity of its insulation performance, and extend its service life.

[0073] Optionally, refer to Figure 6The first terminal 302 has a body portion 3021 and a protrusion 3022. The body portion 3021 passes through the top cover body 3011, and the protrusion 3022 is disposed around the body portion 3021 in the circumferential direction. The sealing ring 304 is located on the outer periphery of the body portion 3021. The third part 3033, the first part 3031 and the second part 3032 cooperate to form a receiving groove 303a. At least a portion of the protrusion 3022 is located in the receiving groove 303a, and the first part 3031 and the second part 3032 are located on opposite sides of the protrusion 3022 in the first direction Z. The protrusion 3022 is provided with a chamfer, and the position of the chamfer corresponds to the connection position of the second part 3032 and the third part 3033.

[0074] The main body 3021 is the main structure of the first terminal 302, penetrating the top cover body 3011. It is the core carrier for current conduction and provides an installation reference for the sealing ring 304 and the rubber-coated structure 303. The protrusion 3022 is an annular protrusion structure arranged circumferentially around the main body 3021. It is at least partially embedded in the receiving groove 303a of the rubber-coated structure 303, forming a positioning fit with the rubber-coated structure 303. Its surface is chamfered, and the chamfer position corresponds to the connection position of the second part 3032 and the third part 3033 in the rubber-coated structure 303.

[0075] The enclosing groove 303a of the rubber-coated structure 303 is an annular groove formed by the first part 3031, the second part 3032 and the third part 3033 of the rubber-coated structure 303. It is used to accommodate the protrusion 3022 and realize the precise positioning of the rubber-coated structure 303 and the first terminal 302.

[0076] The encapsulating groove 303a of the encapsulation structure 303 forms an embedded fit with the protrusion 3022 of the first terminal 302. The first portion 3031 and the second portion 3032 are located on both sides of the protrusion 3022 in the first direction Z, effectively limiting the upper and lower limits of the protrusion 3022. This effectively restricts the movement of the first terminal 302 along the first direction Z and prevents circumferential relative displacement between the encapsulation structure 303 and the terminal. This stable positioning relationship ensures that the encapsulation structure 303 always tightly wraps the gap between the terminal and the top cover plate 301, preventing the insulation gap from widening or failing due to terminal displacement. Structurally, this ensures long-term insulation between the first terminal 302 and the top cover plate 301, reducing the risk of short circuits.

[0077] The chamfered design of the protrusion 3022 corresponds to the connection position of the second part 3032 and the third part 3033 of the overmolding structure 303. This optimizes the stress distribution in the contact area between the two parts. The smooth transition surface of the chamfer disperses stress to a larger contact area, preventing the overmolding structure 303 from breaking due to stress concentration, ensuring the integrity of its insulation performance, and extending its service life. In addition, the chamfered design of the protrusion 3022 also plays a guiding role when assembling the overmolding structure 303 with the terminal, preventing sharp edges from scratching the overmolding structure 303. At the same time, it helps the overmolding structure 303 to quickly and accurately align with the terminal, reducing component wear and alignment difficulty during the assembly process. The embedded fit between the receiving groove 303a and the protrusion 3022 also reduces the adjustment process after assembly, improving production efficiency and assembly consistency.

[0078] Optionally, refer to Figure 9 , Figure 9 This is a schematic diagram of a sealing ring provided in an embodiment of this application. The sealing ring 304 includes: a fourth part 3041 and a fifth part 3042; the fourth part 3041 is located between the support part 3014 and the protrusion 3022, and the fifth part 3042 is located between the support part 3014 and the body part 3021; ​​the support part 3014 is provided with a chamfer, and the position of the chamfer corresponds to the connection position of the fourth part 3041 and the fifth part 3042.

[0079] The fourth part 3041 is located between the support part 3014 and the protrusion 3022, and the fifth part 3042 is located between the support part 3014 and the body part 3021. They correspond to different areas of the first terminal 302, respectively, and can fully cover the gap between the support part 3014 and the terminal, avoiding sealing blind spots caused by changes in the terminal structure. This design enables the sealing ring 304 to form multiple sealing barriers in the axial direction of the first terminal 302. Even if there is slight deformation in some areas, other parts can still maintain the sealing effect, significantly improving the reliability of leakage prevention.

[0080] The chamfer of the support portion 3014 matches the connection position of the two parts of the sealing ring 304, allowing the sealing ring 304 to fit more closely to the contour of the support portion 3014 during installation, avoiding gaps or wrinkles caused by mismatched contact surfaces. This tight fit ensures that the sealing ring 304 is evenly stressed under compression, preventing permanent deformation caused by local overpressure or sealing failure caused by underpressure. It also reduces the positional displacement of the sealing ring 304 under vibration, impact, and other operating conditions, further consolidating the sealing effect.

[0081] Optionally, refer to Figure 2 , Figure 2This is an exploded view of a single battery provided in an embodiment of this application. The single battery also includes a housing 10 and an electrode assembly 20. The electrode assembly 20 is disposed inside the housing 10, and a top cover 301 is connected to the housing 10. The top cover assembly 30 also includes a second terminal, which is disposed through the top cover body 3011. The polarity of the second terminal is opposite to that of the first terminal 302. The electrode assembly 20 includes a body, a first electrode tab, and a second electrode tab. Both the first electrode tab and the second electrode tab are electrically connected to the body, and the first electrode tab is electrically connected to the first terminal 302, and the second electrode tab is electrically connected to the second terminal.

[0082] The casing 10 is the external encapsulation structure of the single battery cell, used to house the electrode assembly 20 and the electrolyte. The electrode assembly 20 is the core component of the battery for energy storage and conversion, and is the site of chemical reactions. It includes the body, the first tab, and the second tab. The body is a main structure formed by alternating stacking or winding of positive electrode plates, negative electrode plates, and a separator. The first tab is a conductive connector led out from the positive or negative terminal of the electrode assembly 20 body and is electrically connected to the first terminal 302, responsible for conducting the current generated by the body to the first terminal 302. The second tab is a conductive connector led out from the electrode assembly 20 body with the opposite polarity to the first tab and is electrically connected to the second terminal. The second terminal is another conductive terminal that passes through the top cover body 3011, with the opposite polarity to the first terminal 302, and is electrically connected to the second tab. Together with the first terminal 302, it constitutes the current output and input interface of the battery.

[0083] The electrode assembly 20 is placed inside the housing 10, and the top cover 301 is connected to the housing 10, so that the inside of the housing 10 forms a sealed space; the first terminal 302 is connected to one pole of the electrode assembly 20 body through the first tab, and the second terminal is connected to the other pole through the second tab, thus forming a current conduction path from the electrode assembly 20 to the tab and then to the terminal.

[0084] The electrode assembly 20 body realizes the storage and release of electrical energy through positive and negative electrode reactions. The first and second electrodes conduct the electrical energy of the electrode assembly 20 to the corresponding positive and negative terminals, and finally output current to external electrical equipment or receive external charging current through the terminals to complete energy storage, thereby realizing the storage and output of electrical energy of a single battery.

[0085] The first and second tabs are directly electrically connected to the electrode assembly 20 body and corresponding terminals. The conduction path is short and there is no additional redundant structure, which reduces resistance loss during current transmission. At the same time, the reliable connection between the terminals and the tabs, as well as the positioning effect of the encapsulation structure 303 on the terminals, can avoid the increase in contact resistance caused by loose connection, ensure efficient current conduction, and improve the charging and discharging efficiency and output performance stability of the battery.

[0086] The housing 10 provides rigid support for the internal electrode assembly 20 to resist external impacts, compression and other external forces; the first and second reinforcing parts 3016 in the top cover assembly 30 strengthen the structure around the terminals, and the encapsulation of the top cover assembly 30 and the housing 10 gives the battery a good resistance to deformation; even under complex working conditions such as vibration and temperature changes, the connection relationship between the electrode assembly 20, the tabs and the terminals can remain stable, avoiding current conduction interruption or sealing failure caused by structural displacement, and ensuring the reliability of the battery in different usage scenarios.

[0087] This application also provides a battery pack, which includes any of the individual cells described above.

[0088] The aforementioned individual battery cells are assembled into a battery pack. The top cover plate 301 is connected to the connecting portion 3012 and the top cover body 3011 via the first reinforcing part 3015 in the top cover plate 301. This increases the overall strength and rigidity of the top cover plate 301, improves the structural stability of the top cover assembly 30, and extends the service life of the individual battery cells. This further improves the structural stability of the battery pack, reduces safety hazards, and extends the service life of the battery pack.

[0089] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

Claims

1. A single-cell battery having a first orientation (Z), characterized in that, Includes a top cover assembly (30), said top cover assembly (30) comprising: A top cover plate (301) includes a top cover body (3011) and a connecting portion (3012), a flange portion (3013), and a supporting portion (3014) all arranged in annular shape. The connecting portion (3012) is connected to the top cover body (3011). The flange portion (3013) and the supporting portion (3014) are respectively connected to the two sides of the connecting portion (3012) in the first direction (Z) to form an annular groove (301a). The first terminal (302) passes through the top cover body (3011); A rubber-coated structure (303) is sleeved between the first terminal (302) and the connecting portion (3012), and at least a portion of the rubber-coated structure (303) is located within the annular groove (301a); A sealing ring (304) is sleeved between the first terminal (302) and the support portion (3014), and the sealing ring (304) is elastic; The top cover plate (301) further includes a first reinforcing part (3015), which is connected to the connecting part (3012) and the top cover body (3011). The first reinforcing part (3015) is located on the side of the connecting part (3012) away from the annular groove (301a).

2. The single-cell battery according to claim 1, characterized in that, The first reinforcing part (3015) is provided in multiple ways, and the multiple first reinforcing parts (3015) are arranged at intervals along the circumferential direction of the connecting part (3012).

3. The single-cell battery according to claim 1, characterized in that, The overmolded structure (303) has a first part (3031), a second part (3032) and a third part (3033), the third part (3033) connecting the first part (3031) and the second part (3032). In the first direction (Z), the first part (3031) is located between the first terminal (302) and the flanged part (3013), the second part (3032) is located between the first terminal (302) and the support part (3014), and the third part (3033) is located between the first terminal (302) and the connecting part (3012). The top cover (301) also includes a second reinforcing part (3016), which is located in the annular groove (301a) and connects the supporting part (3014) and the connecting part (3012).

4. The single-cell battery according to claim 3, characterized in that, The second reinforcing part (3016) is provided in multiples, and the multiple second reinforcing parts (3016) are arranged at intervals along the circumferential direction of the connecting part (3012).

5. The single-cell battery according to claim 3, characterized in that, The two reinforcing parts (3016) are arranged in a ring shape. The second reinforcing part (3016) has a first surface (30161) facing the overmolded structure (303). The first surface (30161) is a chamfered right angle surface or a rounded corner surface.

6. The single-cell battery according to claim 5, characterized in that, The overmolded structure (303) is provided with a first mating surface (3034), which matches the first surface (30161).

7. The single-cell battery according to claim 3, characterized in that, The first terminal (302) has a body portion (3021) and a protrusion portion (3022). The body portion (3021) passes through the top cover body (3011), and the protrusion portion (3022) is disposed around the body portion (3021) in the circumferential direction. The sealing ring (304) is located on the outer periphery of the body part (3021). The third part (3033), the first part (3031) and the second part (3032) cooperate to form an enclosing groove (303a). At least a portion of the protrusion (3022) is located in the enclosing groove (303a), and the first part (3031) and the second part (3032) are located on opposite sides of the protrusion (3022) in the first direction (Z). The protrusion (3022) is provided with a chamfer, and the position of the chamfer corresponds to the connection position of the second part (3032) and the third part (3033).

8. The single-cell battery according to claim 7, characterized in that, The sealing ring (304) includes: a fourth part (3041) and a fifth part (3042); The fourth part (3041) is located between the support part (3014) and the protrusion (3022), and the fifth part (3042) is located between the support part (3014) and the body part (3021); The support portion (3014) is provided with a chamfer, the position of which corresponds to the connection position of the fourth part (3041) and the fifth part (3042).

9. The single-cell battery according to any one of claims 1-8, characterized in that, The single battery also includes a housing (10) and an electrode assembly (20), the electrode assembly (20) being disposed inside the housing (10), and the top cover (301) being connected to the housing (10); The top cover assembly (30) further includes a second terminal, which is disposed through the top cover body (3011), and the polarity of the second terminal is opposite to that of the first terminal (302); The electrode assembly includes a body, a first electrode tab, and a second electrode tab. Both the first electrode tab and the second electrode tab are electrically connected to the body. The first electrode tab is electrically connected to the first terminal (302), and the second electrode tab is electrically connected to the second terminal.

10. A battery pack, characterized in that, Including the single cell battery as described in any one of claims 1-9.

Images