Cover plate assembly and battery cell

Abstract

The utility model relates to battery technology field especially, and more particularly relates to a cover plate subassembly and electric core, the utility model provides a cover plate subassembly, including cover plate body, top patch and upper plastic, the first surface of cover plate body is protruding and forms the convex hull, and the convex hull is used for sticking the cooling plate, and the side of convex hull includes the first side along the length direction extension and the second side along the width direction extension, top patch sets up at the top of convex hull, and the edge of top patch is bent to the first surface and forms the first cover part, and the first cover part covers the first side, and the upper plastic sets up on the first surface of cover plate body, and the side of upper plastic to convex hull forms the second cover part, and the second cover part covers the second side, the utility model provides a cover plate subassembly on the basis of guaranteeing the heat dissipation area of convex hull, realizes the all -round insulation protection of convex hull side, eliminates the short circuit risk between adjacent electric core and between convex hull and electronic component.

Description

Technical Field

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

[0002] As a core component of new energy vehicles and energy storage systems, the safety performance of lithium-ion batteries directly affects the reliable operation of the entire system. In battery pack applications, to achieve high energy density and good heat dissipation, multiple cells typically need to be closely arranged and work in conjunction with a cooling system.

[0003] In existing battery cell structures, the first surface of the cover plate body typically features an upwardly convex bump structure. This bump is used to fit against the cooling plate, increasing the contact area to improve heat dissipation. To ensure good heat dissipation performance, the area of ​​the bump needs to be as large as possible, resulting in a large three-dimensional size, with its sides exposed during cell arrangement.

[0004] Traditional cell insulation protection is primarily achieved through top-mounted patches, which cover the top of the bump and provide electrical insulation. However, traditional top-mounted patches only insulate the top of the bump and cannot effectively cover the sides. The sides of the bump include those extending along its length and those extending along its width. These sides face different electrical risks in battery pack applications: the length-oriented sides mainly face the risk of contact with adjacent cell bumps, while the width-oriented sides are prone to electrical contact with other electrical components such as terminals. When multiple cells are closely arranged in a battery pack, the bump sides are susceptible to accidental contact due to assembly errors, thermal expansion and contraction, vibration, and other factors, leading to a short circuit risk.

[0005] The lack of insulation protection on the convex sides is particularly prominent in high-energy-density battery packs. To increase energy density, battery pack designs tend to reduce cell spacing, which further exacerbates the risk of contact between the longitudinal sides and adjacent cells. Simultaneously, the increased density of electrical components within the battery pack also increases the likelihood of contact between the width sides and other electrical components. Different directions of sides face different spatial constraints and contact risks, posing a technical challenge to a unified insulation protection scheme.

[0006] To address the insulation protection issue on the sides of the battery pack, existing technologies typically involve adding extra insulating components during battery pack assembly, such as inserting insulating gaskets between cells or applying insulating tape to critical areas. However, these methods require additional insulation processing steps during battery pack assembly, increasing assembly complexity. Furthermore, due to the limited space and varied shapes on the sides of the battery pack, the added insulating components are difficult to fit tightly against the side surface. Under the influence of thermal expansion and contraction of the cells or mechanical vibration, the insulating components are prone to displacement or detachment, leading to instability in insulation performance. Additionally, the extra insulating components occupy the limited space between cells, hindering the realization of a compact battery pack design. Utility Model Content

[0007] This utility model provides a cover plate assembly and a battery cell. The cover plate assembly, while ensuring the heat dissipation area of ​​the convex package, achieves all-round insulation protection on the side of the convex package, eliminating the risk of short circuits between adjacent battery cells and between the convex package and electronic components.

[0008] In a first aspect, the present invention provides a cover plate assembly, comprising: a cover plate body, a first surface of the cover plate body protruding to form a convex bulge, the convex bulge being used to fit a cooling plate, the side of the convex bulge including a first side extending along the length direction and a second side extending along the width direction; a top patch disposed on the top of the convex bulge, the edge of the top patch being bent toward the first surface to form a first covering portion, the first covering portion covering the first side; and an upper plastic disposed on the first surface of the cover plate body, the side of the upper plastic facing the convex bulge forming a second covering portion, the second covering portion covering the second side.

[0009] In one possible implementation, the convex hull has two first sides arranged opposite to each other, and the top patch has two first covers, which respectively cover the two first sides.

[0010] In one possible implementation, the length of the first covering portion is equal to the length of the first side surface.

[0011] In one possible implementation, the length of the first covering portion is greater than the length of the first side surface, so that the end of the first covering portion can cover at least a portion of the second side surface.

[0012] In one possible implementation, the convex hull has two oppositely arranged second sides; two upper plastic parts are provided, which are respectively arranged on both sides of the convex hull along its length, and two second covering parts respectively cover the two second sides.

[0013] In one possible implementation, the length of the second covering portion is equal to the length of the second side portion.

[0014] In one possible implementation, the length of the second cover is greater than the length of the second side, and the end of the second cover along the width direction of the convex hull is provided with a bend structure, which covers the corner of the convex hull and presses against the first cover.

[0015] In one possible implementation, the cover plate body is provided with a first through hole, the upper plastic is provided with a second through hole, and the cover plate assembly further includes: a lower plastic, on which a third through hole is provided; and an electrode post, which passes through the third through hole, the first through hole, and the second through hole in sequence.

[0016] In one possible implementation, the upper plastic has a mounting groove on the side away from the cover plate body, and the cover plate assembly further includes: a riveting block, which is disposed in the mounting groove and connected to the pole post; and a sealing ring, which is sleeved on the outer periphery of the pole post to seal the gap between the pole post and the lower plastic.

[0017] In one possible implementation, the first and second sides are planar structures.

[0018] Secondly, this utility model provides a battery cell, comprising: a housing having a cavity and an opening communicating with the cavity; an electrode assembly disposed within the cavity of the housing; and the aforementioned cover plate assembly disposed at the opening of the housing.

[0019] The cover assembly provided by this utility model divides the convex side into a first side extending along the length direction and a second side extending along the width direction according to spatial orientation, and adopts different insulation covering methods accordingly. Due to the requirement of maximizing the heat dissipation area of ​​the convex side, the outer space of the first side is very limited and cannot accommodate additional insulation components. This utility model utilizes the flexibility of the top patch material, bending its edge downwards to form the first covering part. The thickness of the bent covering part is only the thickness of the material itself, allowing it to fit tightly against the surface of the first side in the narrow outer space, effectively isolating the metal surface. The outer area of ​​the second side is originally the installation location of the upper plastic, with relatively ample space. This utility model directly integrates the second covering part into the upper plastic structure, forming a surface-to-surface contact with the second side, achieving insulation without adding additional components. The bending coverage of the top patch and the bonding coverage of the upper plastic work together to completely insulate the originally fully exposed convex side, blocking the contact path with adjacent cells in the length direction and with other electrical components in the width direction. Compared to the existing technology that temporarily adds insulating pads or tape during battery pack assembly, the insulation function of this utility model is directly integrated into the cell cover assembly, eliminating additional assembly steps. At the same time, the first and second covering parts form a stable fit with their respective sides, preventing displacement due to thermal expansion and contraction or vibration. This avoids the problem of external insulating components loosening and falling off during use, fundamentally solving the problem of insulation protection for the convex side. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is an exploded structural diagram of a cover plate assembly provided by this utility model.

[0022] Figure 2 yes Figure 1 A three-dimensional structural diagram of the cover plate assembly shown.

[0023] Figure 3 This is a schematic diagram of the structure of a top patch provided by this utility model.

[0024] Figure 4 This is a schematic diagram of the planar structure of another top patch provided by this utility model after it has been unfolded.

[0025] Figure 5 This is a schematic diagram of the structure of the plastic coating provided by this utility model.

[0026] Figure label: 1. Cover plate body; 11. First surface; 12. Protrusion; 121. First side surface; 122. Second side surface; 13. First through hole; 2. Top patch; 21. First cover section; 3. Top plastic; 31. Second cover; 32. Folded corner structure; 33. Second through hole; 4. Bottom plastic; 41. Third through hole; 5. Pole post; 6. Riveting block; 7. Sealing ring. Detailed Implementation

[0027] 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.

[0028] The following is combined with Figure 1-5 This utility model provides a cover plate assembly, including a cover plate body 1, a top patch 2, and an upper plastic 3, wherein: The first surface 11 of the cover plate body 1 protrudes and forms a protrusion 12, which is used to fit the cooling plate. The side of the protrusion 12 includes a first side 121 extending in the length direction and a second side 122 extending in the width direction.

[0029] The top patch 2 is disposed on the top of the convex hull 12. The edge of the top patch 2 is bent toward the first surface 11 and forms a first covering part 21, which covers the first side 121.

[0030] The upper plastic 3 is disposed on the first surface 11 of the cover plate body 1, and the side of the upper plastic 3 facing the protrusion 12 forms a second covering part 31, which covers the second side 122.

[0031] In this invention, the first surface 11 of the cover plate body 1 protrudes to form a convex 12 for attaching to the cooling plate. To ensure good heat dissipation, the area of ​​the convex 12 needs to be as large as possible. Under this design constraint, the outer space of the first side 121 of the convex 12 is relatively small, making it difficult to accommodate additional insulating components. However, the outer side of the second side 122 is itself the area where the upper plastic 3 for mounting the pole post 5 is arranged, providing space for installing insulating components. In the area where the space is limited on the outer side of the first side 121, the flexibility of the top patch 2 is utilized for bending and covering. The bent first covering part 21 occupies little space and can adapt to the narrow outer space. In the area where the space is sufficient on the outer side of the second side 122, the structure of the upper plastic 3 itself is utilized to directly attach the second covering part 31 to the second side 122 for coverage. This satisfies the requirements for heat dissipation performance and achieves all-round insulation protection on the side.

[0032] Specifically, the bending action of the top patch 2 transforms the material originally laid flat on the top of the protrusion 12 into a three-dimensional covering structure. The thickness of the first covering part 21 after bending is only the thickness of the material itself, and it will not occupy too much outer space. The upper plastic 3 is an essential component for the installation of the pole post 5. Its second covering part 31 forms a close fit with the second side 122, realizing the integration of insulation function and installation function.

[0033] In a specific embodiment, in the close arrangement of power batteries, the spacing between adjacent cells is usually controlled within the range of 3-5mm. There is only 1.5-2.5mm of usable space on the outer side of the first side 121, and the thickness of the top patch 2 is about 0.1mm, which can achieve effective insulation in the limited space. The space of the upper plastic 3 mounting area on the outer side of the second side 122 is relatively ample, providing sufficient freedom for the design of the second cover 31.

[0034] In related technologies, insulation design often overlooks the impact of heat dissipation performance and space constraints, employing a uniform insulation method, which results in either compromised heat dissipation or poor insulation performance. However, in this embodiment of the invention, by fully considering the heat dissipation requirements and spatial distribution characteristics of the convex hull 12, a differentiated insulation strategy is adopted, achieving effective lateral insulation protection while ensuring heat dissipation performance.

[0035] In some embodiments, the convex hull 12 has two first side surfaces 121 disposed opposite to each other, and the top patch 2 has two first covering portions 21, which respectively cover the two first side surfaces 121.

[0036] In this invention, the convex bulge 12 extends in a larger dimension along its length to maximize the heat dissipation area, resulting in first side surfaces 121 at both ends of the convex bulge 12. Due to considerations of heat dissipation area optimization, the outer space of these two first side surfaces 121 is relatively limited, facing the same spatial constraint problem. The top patch 2, as a flexible material, can be bent simultaneously in two directions to form two first covering portions 21. Through bidirectional bending, both first side surfaces 121 can obtain insulation protection within the limited outer space, maintaining the symmetry and consistency of the insulation design.

[0037] Specifically, the two first sides 121 have the same geometric features and spatial constraints due to the symmetrical design of the convex hull 12, and the two first covering parts 21 obtain the same covering capacity through the symmetrical bending of the top patch 2, ensuring the uniform distribution of the insulation effect.

[0038] In one specific embodiment, in the close arrangement of the battery pack, the bulge 12 of each cell is surrounded by the adjacent cells, and both first sides 121 face the potential risk of contact. By bidirectional bending coverage, a consistent level of insulation protection can be provided regardless of the position of the adjacent cells.

[0039] In some embodiments, the length of the first cover portion 21 is equal to the length of the first side portion 121.

[0040] In this invention, the length of the first side surface 121 is determined by the geometric dimensions of the convex bulge 12 to meet the heat dissipation area requirements. Considering the limited space outside the first side surface 121, the first covering portion 21 should not be too long to avoid encroaching on the installation space of adjacent cells. When the length of the first covering portion 21 is equal to the length of the first side surface 121, it can achieve complete coverage of the first side surface 121 without exceeding the necessary range. This precise matching design saves valuable outer space to the maximum extent while meeting insulation requirements.

[0041] Specifically, determining the length of the first side 121 requires balancing the requirements of heat dissipation area and structural strength. The length of the first cover 21 is achieved by controlling the bending depth of the top patch 2. The equal length matching of the two can be achieved through precise process control.

[0042] like Figure 4 As shown, in some embodiments, the length of the first cover portion 21 is greater than the length of the first side surface 121, so that the end of the first cover portion 21 can cover at least a portion of the second side surface 122.

[0043] In this invention, although the space outside the first side 121 is limited, appropriate extension coverage is still feasible. When the length of the first covering part 21 is moderately greater than the length of the first side 121, its end can extend into the area of ​​the second side 122. The significance of this extension design is that the junction of the first side 121 and the second side 122 is often the corner area of ​​the convex hull 12 structure. The geometry of this area is complex, and unidirectional coverage can easily leave dead corners. The end extension of the first covering part 21 overlaps with the second covering part 31 of the upper plastic 3 at the corner. This overlapping coverage eliminates possible weak points in insulation and improves the insulation reliability of the corner area.

[0044] Specifically, corner areas are prone to stress concentration and inadequate coverage due to changes in geometry. Overlapping coverage enhances the insulation capacity of this area through double protection.

[0045] In related technologies, insulation in complex areas such as corners often suffers from insufficient coverage, becoming a weak point in the insulation system. However, in this embodiment of the invention, through a moderately extended coverage design, the insulation protection of critical areas is strengthened without excessively occupying space.

[0046] In some embodiments, the convex bulge 12 has two oppositely disposed second side surfaces 122; two upper plastic parts 3 are disposed on both sides of the convex bulge 12 along its length, and two second covering parts 31 cover the two second side surfaces 122 respectively.

[0047] In this invention, the outer region of the second side 122 of the protrusion 12 is itself the mounting location for the upper plastic 3, which has more ample space compared to the outer region of the first side 121. Due to the available space, two independent upper plastic 3s can be installed on either side of the protrusion 12 along its length. Each upper plastic 3 is specifically responsible for covering one side of the second side 122, and this specialized division of labor avoids the structural complexity that might result from a single upper plastic 3 spanning the entire width of the protrusion 12. Simultaneously, the split design fully utilizes the ample space on the outer side of the second side 122, providing sufficient installation space and structural design freedom for each upper plastic 3.

[0048] Specifically, the two upper plastic sections 3 can be designed independently based on the characteristics of their respective second side sections 122, avoiding the problem of having to consider multiple constraints when designing the whole; the separate installation method also makes full use of the distribution characteristics of the outer space.

[0049] In some embodiments, the length of the second cover portion 31 is equal to the length of the second side portion 122.

[0050] In this invention, since the space in the upper plastic 3 mounting area on the outer side of the second side 122 is relatively ample, the design of the second cover 31 is not subject to strict spatial constraints. Under these conditions, the length of the second cover 31 can be precisely matched with the length of the second side 122. This equal-length design fully utilizes the advantages of the available space, achieving complete coverage while avoiding unnecessary material waste and space occupation.

[0051] Specifically, the length of the second side 122 is determined by the width of the convex 12, and the length of the second cover 31 can be precisely controlled by the injection molding of the upper plastic 3. The equal length matching of the two reflects the precision of the design.

[0052] like Figure 5 As shown, in some embodiments, the length of the second covering portion 31 is greater than the length of the second side 122. The end of the second covering portion 31 along the width direction of the convex hull 12 is provided with a folding structure 32, which covers the corner of the convex hull 12 and presses against the first covering portion 21.

[0053] In this invention, considering the ample space outside the second side 122, the second covering portion 31 can be appropriately extended to achieve additional functions. When the length of the second covering portion 31 is greater than the length of the second side 122, the excess portion can form a folded structure 32. This folded structure 32 covers the corner area of ​​the protrusion 12 on one hand, and extends across the area of ​​the first side 121 on the other hand, applying a pressing effect to the first covering portion 21. Since the space outside the first side 121 is limited, the fixation of the first covering portion 21 mainly relies on the elasticity of the material itself, while the pressing effect from the folded structure 32 of the second covering portion 31 provides additional fixing support for the first covering portion 21, compensating for the limitations of the fixing method caused by the limited space.

[0054] Specifically, the angled structure 32 utilizes the spatial advantage of the outer side of the second side 122 and extends to the area of ​​the first side 121 by bending, forming a cross-regional constraint mechanism; this constraint mechanism effectively makes up for the lack of fixing means caused by insufficient space on the outer side of the first side 121.

[0055] In some embodiments, the cover plate body 1 is provided with a first through hole 13, and the upper plastic 3 is provided with a second through hole 33. The cover plate assembly further includes: a lower plastic 4, on which a third through hole 41 is provided; and an electrode post 5, which passes through the third through hole 41, the first through hole 13, and the second through hole 33 in sequence.

[0056] In this invention, the electrode post 5, as the electrical output terminal of the battery cell, needs to pass through the multi-layer structure of the cover plate assembly. Since the outer side of the second side 122 is the mounting area of ​​the upper plastic 3, the upper plastic 3 itself needs to have a pre-reserved through hole for the electrode post 5 to pass through. Corresponding through holes are provided on the lower plastic 4 and the cover plate body 1 to form an axially connected channel system. As the electrode post 5 passes through these through holes in sequence, it naturally provides an assembly reference for each layer of the structure. This reference function is particularly suitable for the precise positioning requirements of multi-layer structures.

[0057] Specifically, the coaxial design of the three through holes ensures the smooth penetration of the pole post 5, and the fit between the pole post 5 and the wall of the through hole during the penetration process provides a reliable relative positioning for each layer of the structure.

[0058] In some embodiments, the upper plastic 3 is provided with an installation groove on the side away from the cover plate body 1, and the cover plate assembly further includes: a riveting block 6, which is disposed in the installation groove and connected to the pole post 5; and a sealing ring 7, which is sleeved on the outer periphery of the pole post 5 and used to seal the gap between the pole post 5 and the lower plastic 4.

[0059] In this invention, the ample space of the upper plastic 3 located on the outer side of the second side 122 provides favorable conditions for the design of the electrode post 5 connection structure. An installation groove is provided on the side of the upper plastic 3 away from the cover plate body 1. This groove utilizes the depth advantage of the outer space to provide a stable installation position for the riveting block 6. The riveting block 6 bears the mechanical load of the external connector, preventing stress from being directly transmitted to the cover plate body 1 and protecting the structural integrity of the cover plate. The sealing ring 7 establishes a sealing interface in the gap between the electrode post 5 and the lower plastic 4, preventing electrolyte leakage. The coordinated operation of these three components fully leverages the ample space on the outer side of the second side 122.

[0060] In some embodiments, the first side 121 and the second side 122 are planar structures.

[0061] In this invention, considering that the convex bulge 12 mainly serves the function of heat dissipation and needs to be in close contact with the cooling plate, the geometric accuracy requirements of the convex bulge 12 surface are relatively high. The first side 121 and second side 122, which adopt a planar structure, are easier to control geometrically through conventional machining compared to complex curved surface structures. The machining process for planar structures is mature and the machining accuracy is stable, which is beneficial to ensuring the heat dissipation performance of the convex bulge 12. At the same time, the planar structure provides a clear geometric benchmark for the design of insulating components; both the bending and covering of the top patch 2 and the bonding and covering of the upper plastic 3 can be standardized based on the planar design.

[0062] Specifically, planar structures can be obtained through mature processes such as stamping and milling, requiring relatively simple processing equipment and having low processing costs; the bonding relationship between the insulating parts and the plane is clear, making it easy to establish accurate design models.

[0063] This utility model provides a battery cell, comprising: a housing having a cavity and an opening communicating with the cavity; an electrode assembly disposed within the cavity of the housing; and the aforementioned cover plate assembly disposed at the opening of the housing.

[0064] In this invention, a cover plate assembly with side insulation protection is integrated into the battery cell, enabling the cell to possess independent insulation protection capabilities while maintaining good heat dissipation performance. This integrated design is particularly suitable for the application requirements of high-energy-density battery packs, because in such applications, the spacing between cells is often compressed to the limit, making traditional external insulation measures difficult to implement effectively. The built-in side insulation protection function of the cell reduces the reliance on battery pack-level insulation measures, creating conditions for a compact layout of the battery pack.

[0065] Specifically, the battery cell houses the electrode assembly and electrolyte through the casing. The cover assembly provides sealing and electrical interface functions while integrating insulation protection functions on the sides of the convex 12, forming a fully functional battery cell unit.

[0066] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0067] 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 assembly, characterized in that, include: The cover plate body has a first surface that protrudes and forms a convex bulge, the convex bulge being used to fit the cooling plate, and the side of the convex bulge includes a first side extending along the length direction and a second side extending along the width direction. A top patch is disposed on the top of the convex hull, and the edge of the top patch is bent toward the first surface to form a first covering portion, which covers the first side surface; An upper plastic is disposed on the first surface of the cover plate body, and the side of the upper plastic facing the protrusion forms a second covering portion, which covers the second side surface.

2. The cover plate assembly according to claim 1, characterized in that, The convex hull has two first side surfaces arranged opposite to each other, and the top patch has two first covering portions, each of which covers the two first side surfaces.

3. The cover plate assembly according to claim 2, characterized in that, The length of the first covering portion is equal to the length of the first side.

4. The cover plate assembly according to claim 2, characterized in that, The length of the first covering portion is greater than the length of the first side surface, so that the end of the first covering portion can cover at least a portion of the second side surface.

5. The cover plate assembly according to claim 1, characterized in that, The convex hull has two second sides disposed opposite to each other; Two upper plastic parts are provided, and the two upper plastic parts are respectively provided on both sides of the convex bulge along its length direction. The two second covering parts respectively cover the two second side surfaces.

6. The cover plate assembly according to claim 5, characterized in that, The length of the second cover is equal to the length of the second side.

7. The cover plate assembly according to claim 5, characterized in that, The length of the second covering part is greater than the length of the second side. The end of the second covering part along the width direction of the convex hull is provided with a bend structure. The bend structure covers the corner of the convex hull and presses the first covering part.

8. The cover plate assembly according to claim 1, characterized in that, The cover plate body is provided with a first through hole, the upper plastic is provided with a second through hole, and the cover plate assembly further includes: The lower plastic material has a third through hole. The electrode post passes through the third through hole, the first through hole, and the second through hole in sequence.

9. The cover plate assembly according to any one of claims 1-8, characterized in that, The first side and the second side are planar structures.

10. A battery cell, characterized in that, include: A housing having a cavity and an opening communicating with the cavity; The electrode assembly is disposed within the cavity of the housing; The cover assembly as described in any one of claims 1-9 is disposed at the opening of the housing.

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