Top cover structure and battery cell

Abstract

The utility model relates to the technical field of battery manufacturing provides a top cover structure and electric core, top cover structure includes top cover body, first plastic piece and second plastic piece, top cover body has first surface and second surface, first plastic piece is fixed in the first surface of top cover body, and protrudes from first surface, and the riveting pressure hole for passing the pole is set up on first plastic piece, second plastic piece is fixed in the second surface of top cover body, and protrudes from second surface, and the assembly slot for installing pole base is set up on second plastic piece, and assembly slot and riveting pressure hole coaxial arrangement, wherein, first plastic piece sets up first expansion slot in the circumference of riveting pressure hole, second plastic piece sets up second expansion slot on the lateral wall of assembly slot, the utility model discloses through being equipped with expansion slot on first plastic piece and second plastic piece, realizes the absorption to extrusion deformation amount through expansion slot to ensure the dimensional accuracy of top cover structure.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and more particularly to a top cover structure and a battery cell. Background Technology

[0002] In the battery cell structure, the top cover is one of the key structural components, and the top cover structure often has terminals.

[0003] In related technologies, during the molding process of the top cover, the expansion of the material due to riveting causes the material to expand in the riveting area of ​​the pole and the riveting block, which in turn squeezes the plastic structure on the cover plate, resulting in deformation of the upper plastic. Furthermore, the sealing ring is squeezed during the riveting process of the pole, causing the side wall of the lower plastic to be deformed under pressure, affecting the dimensional accuracy and assembly accuracy of the top cover. Summary of the Invention

[0004] This invention provides a top cover structure and a battery cell to solve the defect in the prior art where the top cover structure is easily deformed during the assembly process of the terminal post.

[0005] This invention provides a top cover structure, comprising: a top cover body, a second plastic component, and a second plastic component; the top cover body has a first surface and a second surface facing away from each other; the first plastic component is fixed to the first surface of the top cover body, and the main body portion of the first plastic component protrudes from the first surface, and the first plastic component has a riveting hole for inserting an electrode post; the second plastic component is fixed to the second surface of the top cover body and protrudes from the second surface in a direction away from the top cover body, and the second plastic component has an assembly groove for mounting an electrode post base, the assembly groove being coaxially arranged with the riveting hole; wherein, the first plastic component has a first expansion groove around the riveting hole; and / or, the second plastic component has a second expansion groove on the side wall of the assembly groove.

[0006] According to the top cover structure provided by this utility model, the first plastic part is provided with a receiving groove; the bottom wall of the receiving groove is provided with two riveting holes, and the two riveting holes are spaced apart at opposite ends of the bottom wall of the receiving groove along the length direction of the first plastic part; wherein, the peripheral side wall of each riveting hole is provided with the first expansion groove.

[0007] According to the top cover structure provided by this utility model, the first expansion groove is an annular groove formed along the peripheral sidewall of the receiving groove.

[0008] According to the top cover structure provided by this utility model, the opening of the first expansion groove is formed on the surface of the first plastic part near the top cover body.

[0009] According to the top cover structure provided by this utility model, the second expansion groove is provided on two side walls that are opposite to each other in the width direction of the assembly groove.

[0010] According to the top cover structure provided by this utility model, along the length direction of the second plastic part, the length of the second expansion groove is greater than or equal to the length of the assembly groove.

[0011] According to the top cover structure provided by this utility model, the opening width of the first expansion groove is smaller than the groove width of the second expansion groove.

[0012] According to the top cover structure provided by this utility model, the groove width of the first expansion groove is 0.1mm-0.5mm.

[0013] According to the top cover structure provided by this utility model, the groove width of the second expansion groove is 0.2mm-0.8mm.

[0014] This utility model also provides a battery cell, comprising: a housing; and a top cover structure as described in any of the above claims; the housing has a receiving space for accommodating the battery cell electrode assembly; the top cover structure is disposed on the top of the housing.

[0015] The top cover structure and battery cell provided by the present invention have expansion grooves on both the first plastic part and the second plastic part. The expansion grooves absorb the amount of extrusion deformation, thereby ensuring the dimensional accuracy of the top cover structure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention 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 invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is an exploded structural diagram of the top cover structure provided by this utility model. Figure 2 This is a top view schematic diagram of the top cover structure provided by this utility model.

[0018] Figure 3 This utility model provides Figure 2 Schematic diagram of the cross-sectional structure along the AA direction.

[0019] Figure 4 This is a schematic diagram of the structure of the first plastic part in the top cover structure provided by this utility model.

[0020] Figure 5This is a schematic diagram of another embodiment of the first plastic part in the top cover structure provided by this utility model.

[0021] Figure 6 This is a schematic diagram of the structure of the second plastic component in the top cover structure provided by this utility model.

[0022] Figure label: 10. Top cover body; 20. First plastic part; 21. Receiving groove; 22. Riveting hole; 23. First expansion groove; 30. Second plastic part; 31. Second expansion groove; 32. Assembly groove; 40. Pole post; 41. Base; 50. Sealing ring; 60. Protective block. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0024] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0026] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, 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 different embodiments or examples.

[0028] In related technologies, such as Figure 1 , Figure 3 As shown, during the molding process of the top cover structure, the poles inserted into the riveting holes need to be riveted and fixed. During the riveting and fixing of the poles, the upper plastic (referred to as the first plastic part in this description) will be squeezed. At the same time, since the poles will apply force to the base plate of the poles during the riveting and fixing process, the sealing ring will be compressed. The sealing ring will deform under the compression and squeeze the lower plastic (referred to as the second plastic part in this description). As a result, both the upper and lower plastics will undergo certain deformations during the pole fixing process, which affects the dimensional accuracy and assembly accuracy of the top cover.

[0029] Regarding the problems in related technologies, such as Figures 1-6As shown, this utility model provides a top cover structure, including a top cover body 10, a first plastic part 20, and a second plastic part 30; the top cover body 10 has a first surface and a second surface facing away from each other; the first plastic part 20 is fixed to the first surface of the top cover body 10, the main body of the first plastic part 20 protrudes from the first surface, and the first plastic part 20 has a riveting hole 22 for inserting an electrode post 40; the second plastic part 30 is fixed to the second surface of the top cover body 10 and protrudes from the second surface in a direction away from the top cover body 10, and the second plastic part 30 has an assembly groove 32 for installing an electrode post base 41, the assembly groove 32 being coaxially arranged with the riveting hole 22; wherein, the first plastic part 20 has a first expansion groove 23 around the riveting hole 22; and / or, the second plastic part 30 has a second expansion groove 31 on the side wall of the assembly groove 32. The pole post 40 in the top cover structure is often fixed and assembled by riveting. During the riveting process, the first plastic part 20 and the second plastic part 30 are compressed, which affects their dimensions. In this embodiment, expansion grooves are provided on both the first plastic part 20 and the second plastic part 30. The expansion groove structure absorbs the amount of compression deformation, thereby avoiding the dimensional impact caused by compression and ensuring the dimensional accuracy of the top cover structure.

[0030] Specifically, the top cover body 10 is constructed as a long, block-shaped structure with a first surface and a second surface arranged opposite to each other in the thickness direction. The first surface faces away from the inside of the battery cell, and the second surface faces the inside of the battery cell. Both the top cover body 10 and the second plastic part 30 are provided with mounting holes coaxial with the riveting hole 22. The pole post 40 includes a pole body, a pole post base 41, and a protective block 60. The protective block 60 is provided with a limiting hole coaxial with the riveting hole 22, and the protective block 60 is located inside the first plastic part 20. The pole post base 41 is located inside the mounting groove 32, and the pole body extends through the mounting part into the limiting hole inside the first plastic part 20, thus realizing the overall top cover structure.

[0031] During the specific installation of the pole post 40, the top of the pole post 40 passes through the assembly hole and the limiting hole. Under the action of the riveting equipment, the end of the pole post 40 is turned outward to form a flange structure, such as... Figure 3 As shown, the flange structure at the top of the column extends outward during the flange process, thereby transferring the external extrusion force to the periphery of the first plastic part 20. In this embodiment, a first expansion groove 23 is provided at the periphery of the area corresponding to the riveting hole 22, and the first expansion groove 23 absorbs the extrusion deformation, thereby ensuring the dimensional accuracy of the first plastic part 20.

[0032] Continue as Figure 3 As shown, during the riveting process, as Figure 3The middle arrow indicates the extrusion force generated by the extrusion. The pole base 41 will extrude the sealing ring 50. After extrusion, the sealing ring 50 will extend outward and extrude into the second plastic part 30. In this embodiment, the second expansion groove 31 is provided on the second plastic part 30 to absorb the amount of extrusion deformation, thereby ensuring the dimensional accuracy of the second plastic part 30.

[0033] The first expansion groove 23 extends axially from the side of the first plastic part 20 facing or away from the top cover body 10, giving the first plastic part 20 a gap in the radial direction of the groove width. This gap can offset the radial compression deformation of the first plastic part 20. Similarly, the second expansion groove 31 extends axially from the side of the second plastic part 30 facing or away from the top cover body 10, giving the second plastic part 30 a gap in the radial direction of the groove width. This gap can offset the radial compression deformation of the second plastic part 30. This allows the inner wall near the pole post 40 to shift and deform towards the space where the expansion groove is located when the first plastic part 20 and the second plastic part 30 are subjected to radial compression, thus absorbing the amount of compression deformation and ensuring the accuracy of the external contour dimensions of the first plastic part 20 and the second plastic part 30.

[0034] Understandably, the pole post 40 is typically assembled using riveting equipment. During the riveting process, a flange structure is formed at one end of the top of the pole post 40 to secure it. In this embodiment, expansion grooves are provided on both the first plastic part 20 and the second plastic part 30. These expansion grooves absorb the deformation caused by extrusion, thereby ensuring that the overall dimensions do not deform and improving the yield and quality of the pole post 40 riveting.

[0035] In some embodiments, the first plastic part 20 is provided with a receiving groove 21; the bottom wall of the receiving groove 21 is provided with two riveting holes 22, which are spaced apart at opposite ends of the bottom wall of the receiving groove 21 along the length direction of the first plastic part 20; wherein, the peripheral side wall of each riveting hole 22 is provided with a first expansion groove 23. For the structure of the top cover of the bipolar post 40, the post 40 is often riveted simultaneously. In this embodiment, by providing an expansion groove on the side wall corresponding to each riveting hole 22, the amount of extrusion deformation is effectively absorbed, thereby improving the yield and quality of the top cover.

[0036] Specifically, the first plastic part 20 is an elongated structure, and the receiving groove 21 is arranged along the length of the first plastic part 20 to form an elongated receiving groove 21. The protective block 60 is disposed in the receiving groove 21 and limits the electrode post 40 through the limiting hole in the protective groove. The arrangement of the receiving groove 21 makes the electrode post 40 more impact-resistant and stable.

[0037] It is understandable that, for the top cover of the bipolar post 40, each post 40 will be subjected to a certain radial extrusion on the first plastic part 20 around the post 40 during riveting. In this embodiment, by opening an expansion groove on the side wall of the receiving groove 21 corresponding to each post 40, the amount of extrusion deformation generated by riveting of each post 40 can be absorbed, thereby improving the dimensional accuracy of the top cover structure of the multipolar post 40.

[0038] In this embodiment, as Figure 4 The two rivet holes 22 are respectively provided with first expansion grooves 23 on the peripheral sidewalls. The two first expansion grooves 23 are intermittently arranged in the length direction, which makes the middle area of ​​the first plastic part 20 a solid sidewall structure, ensuring the overall structural strength of the first plastic part 20.

[0039] In conjunction with the above embodiments, such as Figure 5 As shown, the first expansion groove 23 is an annular groove formed along the peripheral sidewall of the receiving groove 21. In this embodiment, by providing a continuous annular groove along the axial direction of the first plastic part 20, the energy absorption of its deformation can be further improved, so that the first plastic part 20 has precise outer contour dimensions.

[0040] Specifically, the first plastic part 20 has a bottom wall and an annular sidewall formed around the edge of the bottom wall, and an annular first expansion groove 23 is formed on the annular sidewall. The annular first expansion groove 23 can achieve a larger and more comprehensive absorption gap, which can ensure the accuracy of the edge dimensions of the first plastic part 20.

[0041] It is understandable that the intermittent first expansion groove 23 may still exhibit slight deformation in its uncovered areas. In this embodiment, to ensure optimal deformation absorption, it is configured as an annular groove structure. Of course, those skilled in the art can choose either annular or intermittent first expansion groove 23 as needed.

[0042] In conjunction with the above embodiments, the opening of the first expansion groove 23 is formed on the surface of the first plastic part 20 near the top cover body 10. The first plastic part 20 is connected to the top cover body 10 on the side near it. By setting the opening on this surface, the overall structural strength can be ensured, and the amount of extrusion deformation can be effectively absorbed.

[0043] It is understandable that the side with the slot is connected to the top cover body 10, which makes the end face away from the top cover body 10 a closed end face, improving the impact resistance of the top cover, and can absorb deformation through the groove inside the side wall.

[0044] In some embodiments, the second expansion groove 31 is provided on two side walls that are opposite each other in the width direction of the assembly groove 32. By providing the second expansion groove 31 on both sides in the width direction, the absorption of extrusion deformation can be effectively achieved.

[0045] Understandably, when the sealing ring 50 is compressed, it will press the second plastic part 30 in all directions (that is, in the length and width directions of the second plastic part 30). The second plastic part 30 has a reinforcing structure in the length direction of the mounting groove 32, which makes it difficult to cause compression deformation in the length direction and will not affect the outer contour size of the second plastic part 30. Therefore, the second expansion groove 31 is only provided in the width direction of the mounting groove 32. The second expansion groove 31 absorbs the expansion in the width direction, avoids deformation in the width direction of the second plastic part 30, and improves the outer contour size of the second plastic part 30.

[0046] In some embodiments, the length of the second expansion groove 31 along the length direction of the second plastic part 30 is greater than or equal to the length of the assembly groove 32. The sealing ring 50, when compressed, can apply pressure to the sidewalls in all directions within the assembly groove. In this embodiment, by limiting the length of the second expansion groove 31 to be greater than the length of the assembly groove 32, it can effectively absorb deformation in the width direction.

[0047] Specifically, in order to achieve complete absorption of deformation in the width direction, this embodiment limits the length of the second expansion groove 31 so that the deformation in the width direction can be effectively absorbed when the sealing ring 50 is compressed and deformed.

[0048] It is understandable that the opening of the second expansion groove 31 is opened on the side of the second plastic part 30 away from the top cover body 10, and is located on the two side walls in the width direction of the assembly groove 32. This arrangement can effectively absorb the deformation of the sealing ring 50 in the width direction after being squeezed.

[0049] In some embodiments, the opening width of the first expansion groove 23 is smaller than the groove width of the second expansion groove 31. By limiting the opening width, it can be adapted to different deformations, thus achieving effective absorption of different deformations.

[0050] It is understandable that the extrusion pressure of the first plastic part 20 is transmitted through the protective block 60, while the second plastic part 30 directly contacts the sealing ring 50 and bears the extrusion pressure within the sealing ring 50. Therefore, in practice, the deformation of the first plastic part 20 is often smaller than that of the second plastic part 30. This embodiment limits the width of the first expansion groove 23 to be smaller than the width of the second expansion groove 31, enabling corresponding processing and achieving adaptation to different deformations.

[0051] In conjunction with the above embodiments, the groove width of the first expansion groove 23 is 0.1mm-0.5mm. The groove width of the first expansion groove 23 cannot be too narrow, as it is difficult to completely absorb deformation, nor can it be too wide, as it will weaken the overall structural strength. The groove width limited in this embodiment enables it to achieve complete absorption of deformation while maintaining high structural strength.

[0052] Specifically, the width of the opening of the first expansion groove 23 is greater than the deformation within the first plastic frame. In actual tests, the deformation of the first plastic part 20 is often around 0.05mm-0.3mm, and its deformation is related to the structural layout and materials. Given a fixed structure and materials, the difference between the width of the opening of the first expansion groove 23 and the deformation of the first plastic part 20 is greater than or equal to 0.1mm. For example, when the deformation of the first plastic part 20 is 0.1mm, the width of the opening of the first expansion groove 23 is 0.2mm-0.5mm.

[0053] In a specific implementation, the groove width of the first expansion groove 23 is 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm.

[0054] In conjunction with the above embodiments, the groove width of the second expansion groove 31 is 0.2mm-0.8mm. The groove width of the second expansion groove 31 cannot be too narrow, as it is difficult to completely absorb deformation, nor can it be too wide, as it will weaken the overall structural strength. The groove width limited in this embodiment enables it to achieve complete absorption of deformation while maintaining high structural strength.

[0055] Specifically, the width of the opening of the second expansion groove 31 is greater than the deformation within the second plastic frame. In actual tests, the deformation of the second plastic part 30 is often around 0.1mm-0.5mm, and its deformation is related to the structural layout and materials. Given a fixed structure and materials, the difference between the width of the opening of the second expansion groove 31 and the deformation of the second plastic part 30 is greater than or equal to 0.1mm. For example, when the deformation of the second plastic part 30 is 0.2mm, the width of the opening of the first expansion groove 23 is 0.3mm-0.8mm.

[0056] In a specific implementation, the groove width of the first expansion groove 23 is 0.2mm, 0.4mm, 0.5mm, 0.6mm or 0.8mm.

[0057] This utility model also provides a battery cell, including a housing and a top cover structure as provided in any of the above claims; the housing has a receiving space for accommodating the battery cell electrode assembly; the top cover structure is disposed on the top of the housing.

[0058] The battery cell provided in this example has the top cover structure of any of the aforementioned embodiments. Therefore, the battery cell in this example has the characteristic effects of each of the aforementioned top cover structures. To avoid redundancy in the effect description, it will not be repeated here.

[0059] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment provides expansion grooves on both the first plastic part 20 and the second plastic part 30, thereby absorbing the amount of extrusion deformation through the expansion grooves, thus ensuring the dimensional accuracy of the top cover structure.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. A top cover structure, characterized in that, include: The top cover body has a first surface and a second surface that are opposite to each other; The first plastic part is fixed to the first surface of the top cover body, and the main body of the first plastic part protrudes from the first surface. The first plastic part is provided with a riveting hole for inserting the pole post. The second plastic part is fixed to the second surface of the top cover body and protrudes from the second surface in a direction away from the top cover body. The second plastic part has an assembly groove for installing the pole base, and the assembly groove is coaxially arranged with the riveting hole. Wherein, the first plastic part has a first expansion groove around the rivet hole; and / or, the second plastic part has a second expansion groove on the side wall of the assembly groove.

2. The top cover structure according to claim 1, characterized in that, The first plastic part is provided with a receiving groove; the bottom wall of the receiving groove is provided with two riveting holes, which are spaced apart at opposite ends of the bottom wall of the receiving groove along the length direction of the first plastic part; The first expansion groove is provided on the peripheral sidewall of each of the riveting holes.

3. The top cover structure according to claim 2, characterized in that, The first expansion groove is an annular groove formed along the periphery of the receiving groove.

4. The top cover structure according to claim 1 or 3, characterized in that, The opening of the first expansion groove is formed on the surface of the first plastic part near the top cover body.

5. The top cover structure according to claim 1, characterized in that, The second expansion groove is provided on two side walls that are opposite each other in the width direction of the assembly groove.

6. The top cover structure according to claim 5, characterized in that, Along the length of the second plastic part, the length of the second expansion groove is greater than or equal to the length of the assembly groove.

7. The top cover structure according to claim 1, characterized in that, The opening width of the first expansion groove is smaller than the groove width of the second expansion groove.

8. The top cover structure according to claim 7, characterized in that, The width of the opening of the first expansion groove is 0.1mm-0.5mm.

9. The top cover structure according to claim 7, characterized in that, The width of the opening of the second expansion groove is 0.2mm-0.8mm.

10. A battery cell, characterized in that, include: case; as well as The top cover structure according to any one of claims 1-9; the housing has a receiving space for accommodating the battery cell electrode assembly; The top cover structure is located on the top of the housing.

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