Cover plate structure, battery cell and battery

Abstract

The utility model relates to battery technical field provides a cover plate structure, electric core and battery, cover plate structure includes: cover plate body has first face and second face of opposition, and the partial area of second face is protruding and forms the heat dissipation boss and is in first face corresponding formation recess, lower plastic piece is cooperated in first face, is provided with the profiled boss on lower plastic piece, and the profiled boss is adapted with recess and is bonded with the inner wall surface of recess, connecting structure is used for connecting heat dissipation boss and profiled boss. Such setting, even if the profiled boss is not enough because of the processing accuracy and produces the cooperation gap with recess inner wall, or because of the deformation damage and recess inner wall originally profiled bonded relation when riveting and pulling, connecting structure still can provide the sustained connecting force for profiled boss and heat dissipation boss, offsets the loose tendency, ensures that the profiled boss keeps stable in the preset position of heat dissipation boss, avoids its displacement or drop, thereby avoids the influence to the surrounding components such as pole lug, guarantees the safety and stability of battery operation.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate structure, a battery cell, and a battery. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the fast charging performance of power batteries, as core components, has become one of the key indicators affecting user experience. However, during fast charging, the terminals and related connection structures on the cell cover are prone to generating a large amount of heat due to the large current passing through them, causing the terminal temperature to rise rapidly. This not only affects the battery's charging and discharging efficiency and cycle life, but may also lead to safety hazards such as thermal runaway.

[0003] Currently, the industry's cooling solutions for battery cells mainly focus on heat dissipation on the large surface and bottom of the cell. However, due to the protruding structures such as terminals and connecting pieces between cells integrated on the cell cover, the water-cooling plate of the entire battery pack cannot effectively adhere to the surface of the cover to achieve targeted cooling. If the water-cooling plate is directly attached to the terminals, the terminals will be subjected to additional pressure, which will reduce their service life. In severe cases, it may even cause the terminals and the connecting pieces on their outer surfaces to detach, leading to battery failure.

[0004] To address the heat dissipation issues in the cover plate and terminal area, the industry has proposed a technical solution involving a convex structure on the cover plate. By directly attaching the convex structure to the water-cooling plate, the cooling effect of the water-cooling plate is transferred to the cover plate and terminal area, while avoiding direct pressure from the water-cooling plate on the terminal. Practice has shown that this design can effectively improve the battery's heat dissipation capacity.

[0005] However, in actual production, it was found that in the cell cover structure, the lower plastic component is attached to the cover and riveted to the cover body via the terminal post, forming an insulating barrier between the terminal post and the cover body. This design, as a mature and traditional solution, has been widely used in the industry. However, due to the presence of the protrusion, the lower plastic component needs to be designed as a contoured structure that matches the shape of the protrusion. But due to the contoured structure and the presence of the protrusion, the following problems arise during battery cover assembly: First, due to limitations in processing precision, there will be a slight gap between the contoured structure and the protrusion. Furthermore, during the terminal post riveting process, the lower plastic is subjected to tensile forces, which can deform localized areas of the lower plastic (especially the contact surface with the protrusion), disrupting the original contoured fit. These factors prevent the contoured structure and the protrusion from forming an effective and tight bond, leading to the lower plastic detaching. The detached lower plastic can affect the electrode tabs, thus adversely impacting the safety and stability of battery operation.

[0006] In view of the above problems and findings, how to achieve effective bonding between the lower plastic and the heat dissipation bump, reduce the shedding of the lower plastic, and improve the safety and stability of battery operation has become an important problem that urgently needs to be solved. Utility Model Content

[0007] This utility model provides a cover plate structure, a battery cell, and a battery to solve the defects in the prior art where the lower plastic detachment affects the safe and reliable operation of the battery. It can achieve effective adhesion between the lower plastic and the heat dissipation bump, reduce the problem of lower plastic detachment, and thus improve the safety and stability of battery operation.

[0008] This utility model provides a cover plate structure, including: The cover plate has a first side and a second side facing each other, and a portion of the second side protrudes to form a heat dissipation bump and forms a groove corresponding to the first side. A lower plastic part is fitted onto the first surface. The lower plastic part is provided with a contoured boss, which is adapted to the groove and fits against the inner wall of the groove. A connection structure is used to connect the heat dissipation protrusion and the contoured protrusion.

[0009] According to the cover plate structure provided by this utility model, the connecting structure includes: Riveting holes are provided on the contoured boss; The rivet post has one end connected to the heat dissipation protrusion and the other end passing through the rivet hole to rivet the heat dissipation protrusion and the lower plastic part.

[0010] According to the cover plate structure provided by this utility model, the end of the riveting post is fixedly connected to the bottom wall of the groove.

[0011] According to the cover plate structure provided by this utility model, the connecting structure is located at the geometric center of the heat dissipation protrusion and the contoured protrusion.

[0012] According to the cover plate structure provided by this utility model, the contoured protrusion is provided with at least two buffer telescopic parts arranged along its own length direction; The buffer telescopic part is used to provide the contoured boss with telescopic deformation allowance along its own length direction; the connecting structure is located between two of the buffer telescopic parts.

[0013] According to the cover plate structure provided by this utility model, the contoured protrusion is provided with at least two blind grooves arranged along its own length direction; The blind groove extends along the width direction of the contoured boss and penetrates both sides of the lower plastic part along its own width direction, forming the buffer expansion section.

[0014] According to the cover plate structure provided by this utility model, the buffer telescopic part is arranged symmetrically with the connecting structure as the center.

[0015] According to the cover plate structure provided by this utility model, the cover plate body is provided with an electrode post hole in another part of the area relative to the heat dissipation protrusion, and also includes an electrode post structure passing through the electrode post hole; The pole structure has a first end corresponding to the first surface, and the lower plastic part is located between the first end and the first surface; and / or, The pole structure has a second end corresponding to the second surface and also includes an upper plastic part, which is located between the second end and the second surface.

[0016] According to the cover plate structure provided by this utility model, the upper plastic part is provided with a groove for accommodating the second end.

[0017] According to the cover plate structure provided by this utility model, the pole post structure includes: A pole piece, inserted through the pole hole; A sealing ring is fitted onto the pole piece and located between the pole piece and the wall of the pole piece hole; A base plate is connected to one end of the pole body and is used to cooperate with the first surface to form the first end of the pole structure; A riveting block is riveted to the other end of the pole body to cooperate with the second surface and form the second end of the pole structure.

[0018] According to the cover plate structure provided by this utility model, the heat dissipation protrusion is located in the middle of the second surface and is arranged along the length direction of the cover plate body; The pole structure is provided in two sets; the two sets of pole structures are respectively located at the two ends of the convex hull along its own length direction.

[0019] This utility model also provides a battery cell, including a housing, an electrode assembly housed within the housing, and a cover plate structure connected to the housing as described in any one of the above.

[0020] This utility model also provides a battery, including the above-mentioned battery cell.

[0021] The cover plate structure, battery cell, and battery provided by this utility model feature a heat dissipation protrusion on the second side of the cover plate that can directly adhere to the water-cooling plate of the entire battery pack, transferring the cooling effect of the water-cooling plate to the terminal area while avoiding direct pressure from the water-cooling plate on the terminal, thus improving the heat dissipation capacity of the battery cell. A lower plastic component fits onto the first side of the cover plate to form an insulating barrier. The contoured protrusion ensures that the shape and size of the lower plastic component match those of the cover plate, guaranteeing a tight fit. The connecting structure secures the contoured protrusion and the heat dissipation protrusion. Even if the contoured protrusion has a gap with the inner wall of the groove due to insufficient machining precision, or if the original contoured fit is disrupted by deformation during riveting, the connecting structure still provides continuous connection force to the contoured protrusion and the heat dissipation protrusion, counteracting any loosening and ensuring the contoured protrusion remains stable in its preset position on the heat dissipation protrusion, preventing displacement or detachment. This avoids impacting surrounding components such as the electrode tabs, ensuring the safety and stability of battery operation. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the cover plate structure provided in an embodiment of the present utility model.

[0024] Figure 2 This is a schematic diagram of the structure of the cover plate provided in an embodiment of the present utility model.

[0025] Figure 3 This is a structural schematic diagram of the lower plastic part provided in an embodiment of the present utility model.

[0026] Figure 4 This is a cross-sectional view of the cover plate structure provided in an embodiment of this utility model.

[0027] Figure 5 yes Figure 4 Enlarged view of part A in the middle.

[0028] Figure 6 This is an exploded view of the cover plate structure provided in an embodiment of this utility model.

[0029] Figure label: 10. Cover plate; 11. Heat dissipation protrusion; 12. Groove; 13. Pole post hole; 20. Lower plastic part; 21. Contouring boss; 22. Buffer telescopic part; 30. Connecting structure; 31. Riveting post; 32. Riveting hole; 40. Pole post structure; 41. Pole post body; 42. Sealing ring; 43. Base plate; 44. Riveting block; 50. Upper plastic part; 51. Groove. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] To better understand the cover structure, cell, and battery provided in this utility model embodiment, we will first introduce its application background. Currently, most cell cooling solutions in the industry target the large surface and bottom of the cell. However, because the cell cover integrates protruding structures such as terminals and external connecting pieces, the water cooling plate of the entire battery pack cannot be effectively attached to the cover for targeted cooling. If the water cooling plate is directly attached to the terminals, it will shorten the life of the terminals and, in severe cases, cause the terminals and external connecting pieces to fall off, leading to battery failure.

[0032] To address this, the industry has proposed a technical solution involving designing a convex structure on the cover plate. By directly attaching the convex structure to the water-cooling plate, the cooling effect of the water-cooling plate can be transferred to the cover plate and the pole area, while avoiding direct pressure from the water-cooling plate on the pole.

[0033] However, in actual production, it was found that in the cell cover structure, the lower plastic component is attached to the cover and riveted to the cover body by the terminal post, forming an insulating barrier between the terminal post and the cover body. This design, as a mature and traditional solution, has been widely used in the industry. However, due to the presence of the protrusion, the lower plastic component needs to be designed as a contoured structure that matches the shape of the protrusion. But due to the contoured structure and the presence of the protrusion, the following problems arise in the battery cover assembly: First, due to limitations in processing precision, there will be a slight gap between the contour structure and the convex bulge. In addition, during the pole riveting process, the lower plastic will be subjected to tensile force, which will cause local areas of the lower plastic (especially the contact surface that is in contact with the convex bulge) to deform, thus destroying the original contour bonding relationship.

[0034] The above factors can cause the contoured structure and the convex bump to fail to form an effective and tight fit, resulting in the lower plastic detaching. The detached lower plastic can affect the tabs, thus adversely affecting the safety and stability of battery operation.

[0035] In view of the above problems, this utility model provides a cover plate structure, a battery cell and a battery, which can achieve effective bonding between the lower plastic and the heat dissipation protrusion, avoid the problem of the lower plastic falling off, and thus improve the safety and stability of battery operation.

[0036] The following is combined with Figures 1 to 6 This invention describes the cover plate structure, battery cell, and battery of this utility model.

[0037] Reference Figures 1 to 3 A cover plate structure includes a cover plate body 10, a lower plastic part 20, and a connecting structure 30; wherein, the cover plate body 10 has a first surface and a second surface facing each other, a portion of the second surface protrudes to form a heat dissipation bump 11 and a corresponding groove 12 on the first surface; the lower plastic part 20 is fitted to the first surface, and a contoured boss 21 is provided on the lower plastic part 20, the contoured boss 21 is adapted to the groove 12 and fits against the inner wall surface of the groove 12; the connecting structure 30 is used to connect the heat dissipation bump 11 and the contoured boss 21.

[0038] In practical applications, the heat dissipation protrusion 11 located on the second side of the cover plate 10 can directly adhere to the water-cooling plate of the entire battery pack, transferring the cooling effect of the water-cooling plate to the terminal area while avoiding direct pressure from the water-cooling plate on the terminal, thus improving the heat dissipation capacity of the battery cell. The lower plastic part 20 fits onto the first side of the cover plate 10 to form an insulating barrier. The contoured protrusion 21 ensures that the shape and size of the lower plastic part 20 match those of the cover plate 10, guaranteeing a tight fit between the two. The connecting structure 30 can fix the contoured protrusion 21 and the heat dissipation protrusion 11.

[0039] Thus, even if the contoured boss 21 has a gap with the inner wall of the groove 12 due to insufficient processing precision, or if the original contoured fit relationship with the inner wall of the groove 12 is damaged due to the pulling deformation during riveting, the connecting structure 30 can still provide a continuous connection force for the contoured boss 21 and the heat dissipation protrusion 11, counteract the loosening trend, ensure that the contoured boss 21 remains stable in the preset position of the heat dissipation protrusion 11, avoid its displacement or falling off, thereby avoiding the impact on peripheral components such as the tabs, and ensuring the safety and stability of battery operation.

[0040] It is understandable that the cover plate 10, as the carrier of various components, needs to be selected and designed according to actual needs, such as the shape, size and material of the battery cell, the strength of the cover plate 10 and the welding requirements.

[0041] In one example of this utility model, the cover plate 10 is a rectangular aluminum plate with one side along its thickness as the first side and the opposite side as the second side. After the cover plate 10 is welded and assembled with the shell, its first side faces the inside of the shell and its second side faces the outside of the shell. The heat dissipation protrusion 11 is formed on the second side and is used to fit with the water cooling plate of the external battery pack to achieve heat dissipation of the cover plate.

[0042] The specific shape, size, and other parameters of the heat dissipation bump 11 need to be selected and designed according to actual needs. For example, the heat dissipation bump 11 can be set as a rectangle to match the shape of the cover plate 10 to the greatest extent, so as to make full use of the space on the cover plate 10. At the same time, the length, width, or number of heat dissipation bumps 11 can be adjusted to match different heat dissipation requirements. In addition, depending on different needs, the heat dissipation bump 11 can be formed on the cover plate 10 using different molding processes, including but not limited to stamping, integral molding, and welding.

[0043] The shape and size of the lower plastic part 20 and its upper contoured boss 21 are adapted to the first surface of the cover plate 10, thereby ensuring that the lower plastic part 20 can fit tightly and effectively with the first surface.

[0044] In detail, the heat dissipation protrusion 11 is a rectangular structure, which is formed on the cover plate 10 by stamping. Thus, while the heat dissipation protrusion 11 is formed on the second surface, a corresponding groove 12 is formed on the first surface. The lower plastic part 20 is rectangular and is made of polypropylene (PP) material, which gives it excellent electrical insulation properties, mechanical properties and chemical stability, meeting the requirements for internal insulation and resistance to electrolyte.

[0045] The contoured boss 21 is integrally molded onto the lower plastic part 20; specifically, the two can be integrally injection molded. The cross-section of the contoured boss 21 is rectangular and matches the size of the heat dissipation bump 11, ensuring that the contoured boss 21 can fit tightly against the inner wall of the groove 12. The connecting structure 30 is used to connect the contoured boss 21 and the heat dissipation bump 11, preventing the contoured boss 21 from shifting or falling off and affecting surrounding components such as the tab.

[0046] In detail, the connecting structure 30 is located at the geometric center of the heat dissipation protrusion 11 and the contoured boss 21. This arrangement ensures a uniform constraint relationship between the two during assembly and under stress. The positioning of the geometric center ensures that the fixing force of the connecting structure 30 on the heat dissipation protrusion 11 and the contoured boss 21 is evenly distributed in all directions, reducing local deformation or increased gaps caused by uneven stress, and further improving the stability of the fit between the contoured boss 21 and the heat dissipation protrusion 11. At the same time, this central setting can minimize the impact of tensile forces on the contoured boss 21 during riveting and other processes, reducing problems such as stress offset or tearing of the contoured boss 21.

[0047] Understandably, the connection structure 30 can be configured in different structural forms depending on different actual needs.

[0048] In one example of this utility model, refer to Figures 3 to 5 The connecting structure 30 includes a riveting post 31 and a riveting hole 32; wherein, the riveting hole 32 is provided on the contour boss 21; one end of the riveting post 31 is connected to the heat dissipation protrusion 11, and the other end passes through the riveting hole 32 to rivet the heat dissipation protrusion 11 and the lower plastic part 20.

[0049] It should be clarified here that, in order to ensure the overall insulation performance of the battery and avoid unnecessary conductive paths between the cell and the cover plate 10 caused by the connection structure 30, an insulation design can be implemented between the connection structure 30 and the cover plate 10. For example, insulating material can be used for covering and isolation, or the above-mentioned riveting post 31 can be made of insulating material. The specific choice can be made according to actual needs, and no specific limitation is made in this embodiment of the utility model.

[0050] In some optional embodiments of this utility model, a through hole can be provided on the heat dissipation protrusion 11, and the riveting post 31 can be riveted after passing through the through hole on the heat dissipation protrusion 11, thereby fixing the riveting post 31 to the heat dissipation protrusion 11; alternatively, the end of the riveting post 31 can be directly fixed to the bottom wall of the groove 12. Of course, the riveting post 31 and the heat dissipation protrusion 11 can also be fixedly connected in other ways, which will not be listed in the embodiments of this utility model.

[0051] In this embodiment, the end of the riveting post 31 is fixedly connected to the bottom wall of the groove 12. This arrangement provides a stable support base for the riveting post 31, ensuring that the riveting post 31 is not prone to tilting or displacement when subjected to riveting force, thereby guaranteeing the stability of the riveting process.

[0052] While fixing the contoured boss 21 and the heat dissipation protrusion 11 to the connecting structure 30 can effectively ensure the stability of the contoured boss 21 on the heat dissipation protrusion 11 and prevent its displacement or detachment from interfering with surrounding components such as the tab, it also brings new problems. The rigid constraint of the connecting structure 30 will suppress the tensile deformation of the contoured boss 21. Specifically, during the subsequent riveting assembly process, both ends of the lower plastic part 20 will be subjected to tensile force. The cooperation between the riveting post 31 and the riveting hole 32 has fixed the contoured boss 21 and the heat dissipation protrusion 11 into a relatively rigid whole. The contoured boss 21 is difficult to buffer or release this tensile force through its own tensile deformation, which increases the risk of breakage.

[0053] To solve the above problems, in a further example of the present invention, the contoured boss 21 is provided with at least two buffer telescopic parts 22 arranged along its own length direction. The buffer telescopic parts 22 are used to provide the contoured boss 21 with telescopic deformation allowance along its own length direction; the connecting structure 30 is located between two of the buffer telescopic parts 22.

[0054] With this configuration, the buffer telescopic part 22 can provide the contoured boss 21 with a length-direction telescopic deformation allowance. When the lower plastic part 20 is pulled at both ends during the riveting process, the pulling force will cause the contoured boss 21 to stretch along the length direction. At this time, the buffer telescopic part 22 located on both sides of the connecting structure 30 can absorb part of the pulling force through its own elastic deformation, providing a certain stretch buffer space for the contoured boss 21 and reducing the risk of the lower plastic part 20 breaking.

[0055] In detail, the contoured boss 21 has at least two blind grooves arranged along its length. The blind grooves extend along the width of the contoured boss 21 and penetrate both sides of the lower plastic part 20 along its width, forming the aforementioned buffer expansion and contraction portion 22. With this configuration, the thin design of the blind groove area due to material removal creates a deformable flexible segment on the lower plastic part 20. When the lower plastic part 20 is subjected to a tensile force along its length, the blind groove area can deform appropriately as the tensile force increases, thereby providing the contoured boss 21 with expansion and contraction allowance along its length and reducing the risk of breakage of the lower plastic part 20.

[0056] More specifically, there are two buffer expansion joints 22, which are symmetrically arranged on both sides of the connecting structure 30. This symmetrical arrangement allows the buffer expansion joints 22 on both sides of the connecting structure 30 to form a balanced deformation buffering effect when the contoured boss 21 is subjected to tensile force along the length direction. This avoids the tensile force being concentrated on one side of the buffer expansion joint 22, reducing the risk of failure of the buffer expansion joint 22 on one side due to excessive deformation. At the same time, it also reduces the problem of breakage caused by excessive force on one side of the lower plastic part 20.

[0057] The following section will describe in detail the other structures or components on the cover plate structure with reference to the accompanying drawings.

[0058] Reference Figure 6 The cover plate 10 has a pole hole 13 in another part of the area relative to the heat dissipation protrusion 11; it also includes a pole structure 40, which passes through the pole hole 13 to form a first end corresponding to the first surface. The lower plastic part 20 is located between the first end and the first surface to achieve electrical isolation between the first end and the first surface.

[0059] In some optional examples of this utility model, the pole structure 40 is mainly used to draw out current. The number of poles can be one or more, depending on the actual needs.

[0060] In this embodiment, the heat dissipation protrusion 11 is located in the middle of the cover plate 10, and two sets of pole post structures 40 are provided, which are located at the two ends of the heat dissipation protrusion 11 along its own length direction.

[0061] In a further example of this utility model, the cover plate structure also includes an upper plastic part 50. After the pole post structure 40 passes through the pole post hole 13, it also forms a second end corresponding to the second surface. The upper plastic part 50 is disposed between the second end and the second surface to achieve electrical isolation between the second end and the second surface.

[0062] In detail, the upper plastic part 50 is provided with a groove 51 for accommodating the second end. The groove 51 can provide positioning for the second end of the pole post structure 40, ensuring the continuous reliability of its insulation and isolation function.

[0063] Understandably, the specific shape, size, and other parameters of the upper plastic part 50 and its upper tank 51 need to be adapted to the second end of the pole structure 40.

[0064] In this embodiment, the upper plastic part 50 has a rectangular structure and is made of polyphenylene sulfide (PPS) material, which gives it excellent electrical insulation properties, mechanical properties, and chemical stability, meeting the requirements for external insulation and dimensional stability. One side of the upper plastic part 50 is flat and is used to fit and abut against the second side of the cover plate 10. The groove 51 is formed on the other side of the upper plastic part 50.

[0065] In detail, the pole structure 40 includes a pole body 41, a sealing ring 42, a base plate 43, and a riveting block 44; wherein, the pole body 41 passes through the pole hole 13; the sealing ring 42 is sleeved on the pole body 41 and located between the outer wall of the pole body 41 and the hole wall of the pole hole 13, for realizing electrical isolation between the pole body 41 and the hole wall of the pole hole 13; the base plate 43 is connected to one end of the pole body 41 for mating with the first surface, forming the first end of the pole structure 40; the riveting block 44 is riveted to the other end of the pole body 41 for mating with the second surface, forming the second end of the pole structure 40.

[0066] In detail, when connecting the pole post structure 40, the pole post body 41 is led out from the pole post hole 13, and then the riveting block 44 is installed and riveted. The base plate 43 of the pole post structure 40 is pressed onto the first side of the cover plate body 10, and the riveting block 44 is pressed onto the second side of the cover plate, thereby realizing the connection between the pole post structure 40 and the cover plate body 10.

[0067] The battery cell provided by this utility model is described below. The battery cell described below and the cover plate structure described above can be referred to in correspondence.

[0068] A battery cell includes a housing, an electrode assembly housed within the housing, and a cover structure connected to the housing according to any of the above examples.

[0069] In detail, the cover plate 10 is welded and fixed to the shell to form a sealed space with a certain structural strength for protecting the electrode assembly.

[0070] It should be clarified here that when the cell has a single-sided terminal post structure, the positive and negative terminals of the electrode group are led out by two terminal post structures 40 on the same cover plate structure respectively. When the cell has a double-sided terminal post structure, the positive and negative terminals of the electrode group are led out by two cover plate structures on opposite sides of the casing respectively. In this case, the aforementioned cover plate structure can be located at either the positive or negative terminal of the cell.

[0071] The battery provided by this utility model is described below. The battery described below can be referred to in correspondence with the cover plate structure and cell described above.

[0072] A battery comprising the aforementioned battery cell.

[0073] It is understood that, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples.

[0074] Through the cover plate structure, cell, and battery provided in this embodiment of the utility model, the connecting structure 30 can fix the contoured protrusion 21 and the heat dissipation protrusion 11. Thus, even if the contoured protrusion 21 has a gap with the inner wall of the groove 12 due to insufficient processing precision, or if the original contoured fit relationship with the inner wall of the groove 12 is damaged due to the pulling deformation during riveting, the connecting structure 30 can still provide a continuous connection force for the contoured protrusion 21 and the heat dissipation protrusion 11, counteract the loosening trend, ensure that the contoured protrusion 21 remains stable in the preset position of the heat dissipation protrusion 11, avoid its displacement or falling off, thereby avoiding the impact on peripheral components such as the tabs, and ensuring the safety and stability of battery operation.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cover plate structure, characterized in that, include: The cover plate has a first side and a second side facing each other, and a portion of the second side protrudes to form a heat dissipation bump and forms a groove corresponding to the first side. A lower plastic part is fitted onto the first surface. The lower plastic part is provided with a contoured boss, which is adapted to the groove and fits against the inner wall of the groove. A connecting structure is used to connect the heat dissipation protrusion and the contoured protrusion.

2. The cover plate structure according to claim 1, characterized in that, The connection structure includes: Riveting holes are provided on the contoured boss; The rivet post has one end connected to the heat dissipation protrusion and the other end passing through the rivet hole to rivet the heat dissipation protrusion and the lower plastic part.

3. The cover plate structure according to claim 2, characterized in that, The end of the rivet post is fixedly connected to the bottom wall of the groove.

4. The cover plate structure according to any one of claims 1 to 3, characterized in that, The connecting structure is located at the geometric center of the heat dissipation bulge and the contoured boss.

5. The cover plate structure according to claim 1, characterized in that, The contoured protrusion is provided with at least two buffer telescopic parts arranged along its own length direction; The buffer telescopic part is used to provide the contoured boss with telescopic deformation allowance along its own length direction; the connecting structure is located between two of the buffer telescopic parts.

6. The cover plate structure according to claim 5, characterized in that, The contoured boss is provided with at least two blind slots arranged along its own length. The blind groove extends along the width direction of the contoured boss and penetrates both sides of the lower plastic part along its own width direction, forming the buffer expansion section.

7. The cover plate structure according to claim 5, characterized in that, The buffer expansion joints are arranged symmetrically around the connecting structure.

8. The cover plate structure according to claim 1, characterized in that, The cover plate body is provided with a pole post hole in another part of the area relative to the heat dissipation protrusion, and also includes a pole post structure passing through the pole post hole; The pole structure has a first end corresponding to the first surface, and the lower plastic part is located between the first end and the first surface; and / or, The pole structure has a second end corresponding to the second surface and also includes an upper plastic part, which is located between the second end and the second surface.

9. A battery cell, characterized in that, It includes a housing, an electrode assembly housed within the housing, and a cover structure connected to the housing as described in any one of claims 1 to 8.

10. A battery, characterized in that, Including the battery cell as described in claim 9.

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