Cover plate structure and battery cell
By designing inclined plastic protrusions and chamfered structures in the cover plate structure, the problem of pressure damage to the edges and corners of the electrode assembly was solved, improving the process yield and safety performance of the battery cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-07
Smart Images
Figure CN224472547U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a cover plate structure and a battery cell. Background Technology
[0002] The cover plate structure of the blade battery cell has an output terminal, and the electrode tabs of the electrode assembly are welded to the output terminal to ensure current conduction. A plastic part of the cover plate is attached to the inside of the cover plate, and the protrusions of the plastic part facing the electrode assembly have end faces that completely fit the electrode assembly. During the electrode assembly insertion process, there is a resistance force between the protrusions of the plastic part and the electrode assembly. When the finished battery cell is subjected to vibration, impact, or other environments, and the electrode assembly moves within the casing, the interaction force between the protrusions of the cover plate's plastic part and the electrode assembly increases. Under these circumstances, the edges and corners of the electrode assembly are often damaged by the protrusions of the plastic part, thus affecting the battery cell's manufacturing yield and safety performance. Utility Model Content
[0003] One objective of this invention is to provide a cover structure that can prevent the edges and corners of the electrode assembly from being damaged by plastic parts, thereby improving the process yield and safety performance of the battery cell.
[0004] To achieve this objective, the present invention adopts the following technical solution:
[0005] A cover plate structure is provided, including a plastic part having a protrusion. A first end face of the protrusion abuts against a second end face of an electrode assembly. A first side face of the protrusion is inclined toward the second end face. The first side face and the second end face together form a clearance space. At least one end of the two ends of the second end face that are disposed opposite each other along a first direction is located within the clearance space. The edge of the first end face has a chamfer structure, which is disposed corresponding to the edge of the second end face. The first direction is the length direction of the plastic part.
[0006] Optionally, the plastic part has two protrusions, which are respectively disposed at opposite ends of the plastic part along the first direction. One end of the two ends of the second end face disposed opposite to each other along the first direction is located in the clearance space of one of the protrusions, and the other end of the two ends of the second end face disposed opposite to each other along the first direction is located in the clearance space of the other protrusion.
[0007] Optionally, the first side edge between the first side surface and the first end surface is parallel to the width direction of the plastic part.
[0008] Optionally, the plastic part includes a body portion, the protrusion is disposed on the body portion, the body portion has a second side surface, and the second side surface is on the same plane as the first side surface.
[0009] Optionally, the maximum thickness 'a' of the plastic part ranges from 5mm to 8mm.
[0010] Optionally, the included angle α between the first side surface and the first end surface ranges from 105° to 120°.
[0011] Optionally, a first edge is provided between the first end face and the first side face, and the distance between one end of the first edge and the corner of the adjacent second end face is in the range of 3mm-6mm.
[0012] Optionally, the dimension d of the chamfer structure along the thickness direction of the plastic part ranges from 0.8mm to 1.2mm.
[0013] Optionally, the first side surface is provided with curved transitions at both sides along the width direction of the plastic part.
[0014] Another objective of this invention is to provide a battery cell that can prevent the edges and corners of the electrode assembly from being damaged by plastic parts, thereby improving the manufacturing yield and safety performance of the battery cell.
[0015] To achieve this objective, the present invention adopts the following technical solution:
[0016] A battery cell is provided, comprising a housing body and the aforementioned cover structure, wherein the cover structure is provided to seal the opening of the housing body.
[0017] The beneficial effects of this utility model are:
[0018] This utility model provides a cover plate structure, including a plastic part with a protrusion. The first end face of the protrusion abuts against the second end face of the electrode assembly. The first side face of the protrusion is inclined and faces the second end face. The first side face and the second end face together form a clearance space. At least one end of the two ends of the second end face that are opposite each other along a first direction is located within the clearance space. The edge of the first end face has a chamfer structure, which is provided corresponding to the edge of the second end face. The first direction is the length direction of the plastic part. By incising the first side face of the protrusion of the plastic part and providing a chamfer structure at the edge of the first end face, the protrusion can avoid the corners and edges of the second end face of the electrode assembly, preventing the edges and corners of the electrode assembly from being damaged by the plastic part, thereby improving the process yield and safety performance of the battery cell.
[0019] This utility model also provides a battery cell, including a housing body and the aforementioned cover plate structure, the cover plate structure being sealed over the opening of the housing body. This battery cell can prevent the edges and corners of the electrode assembly from being damaged by plastic parts, improving the battery cell's manufacturing yield and safety performance. Attached Figure Description
[0020] Figure 1 This is a partial structural schematic diagram of the battery cell provided in an embodiment of the present invention;
[0021] Figure 2 This is a first-view structural schematic diagram of the cover plate structure provided in this embodiment of the utility model;
[0022] Figure 3 This is a second-view structural schematic diagram of the cover plate structure provided in this embodiment of the utility model.
[0023] In the picture:
[0024] 1. Plastic part; 11. Protrusion; 111. First end face; 112. First side face; 113. Chamfered structure; 12. Body part; 121. Second side face; 13. Curved transition; 2. First cover plate;
[0025] 100, Cover plate structure; 200, Pole group; 201, Second end face; 2011, Corner; 300, Clearance space; 400, Second cover plate; 500, End plate. Detailed Implementation
[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the drawings, not all of them.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature 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 includes the first feature 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.
[0029] The cover plate structure of the blade battery cell has an output terminal, and the electrode tabs of the electrode assembly are welded to the output terminal to ensure current conduction. A plastic part of the cover plate is attached to the inside of the cover plate, and the protrusions of the plastic part facing the electrode assembly have end faces that completely fit the electrode assembly. During the electrode assembly insertion process, there is a resistance force between the protrusions of the plastic part and the electrode assembly. When the finished battery cell is subjected to vibration, impact, or other environments, and the electrode assembly moves within the casing, the interaction force between the protrusions of the cover plate's plastic part and the electrode assembly increases. Under these circumstances, the edges and corners of the electrode assembly are often damaged by the protrusions of the plastic part, thus affecting the battery cell's manufacturing yield and safety performance.
[0030] Therefore, this embodiment provides a cover plate structure 100 to solve the above problems. The cover plate structure 100 can prevent the edges and corners 2011 of the electrode group 200 from being damaged by the plastic part 1, thereby improving the process yield and safety performance of the battery cell.
[0031] like Figures 1-3 As shown, the cover plate structure 100 of this embodiment includes a plastic part 1. The plastic part 1 has a protrusion 11. The first end face 111 of the protrusion 11 abuts against the second end face 201 of the electrode assembly 200. The first side face 112 of the protrusion 11 is inclined and tilted toward the second end face 201. The first side face 112 and the second end face 201 together form a clearance space 300. At least one of the two ends of the second end face 201 that are arranged opposite each other along a first direction is located in the clearance space 300. The edge of the first end face 111 has a chamfer structure 113. The chamfer structure 113 is arranged corresponding to the edge of the second end face 201. The first direction is the length direction of the plastic part 1. Figure 1 In the diagram, the gh direction is the length direction of the plastic part 1, i.e., the first direction; the pq direction is the width direction of the plastic part 1; and the jk direction is the thickness direction of the plastic part 1.
[0032] By tilting the first side 112 of the protrusion 11 of the plastic part 1 and providing a chamfered structure 113 at the edge of the first end face 111, the protrusion 11 can avoid the corner 2011 and edge of the second end face 201 of the electrode group 200, preventing the edge and corner 2011 of the electrode group 200 from being damaged by the plastic part 1. This avoids the plastic part 1 damaging the electrode group 200 during the electrode group 200 insertion process, improving the cell manufacturing yield. Furthermore, during subsequent use, the electrode group 200 may move inside the cell casing under conditions such as vibration and impact. The interaction force between the protrusion 11 of the plastic part 1 of the cover plate structure 100 and the electrode group 200 will also increase. However, since the protrusion 11 of the plastic part 1 avoids the edge and corner 2011 of the electrode group 200, damage and deformation of the edge and corner 2011 can be prevented, ensuring the safety performance of the cell.
[0033] like Figure 2As shown, optionally, the plastic part 1 has two protrusions 11, which are respectively disposed at opposite ends of the plastic part 1 along the first direction. The space between the two protrusions 11 is the electrode tab receiving space of the electrode assembly 200. One end of the two opposite ends of the second end face 201 along the first direction is located within the clearance space 300 of one protrusion 11, and the other end of the two opposite ends of the second end face 201 along the first direction is located within the clearance space 300 of the other protrusion 11. That is, as Figure 1 As shown, the two corners 2011 on the left side of the second end face 201 of the electrode assembly 200 are located in the clearance space 300 on the left side of the left protrusion 11 of the plastic part 1, and the two corners 2011 on the right side of the second end face 201 of the electrode assembly 200 are located in the clearance space 300 on the right side of the right protrusion 11 of the plastic part 1, so as to ensure that the four corners 2011 of the second end face 201 of the electrode assembly 200 do not contact the protrusions 11 at both ends.
[0034] Optionally, the first side edge between the first side surface 112 and the first end surface 111 is parallel to the width direction of the plastic part 1, that is, the distance between the first side edge and the two corners 2011 of the adjacent electrode group 200 is the same. Optionally, the first side edge is also provided with a chamfered structure 113, which can further prevent the first side edge from being too sharp and scratching the second end surface 201 of the electrode group 200, and can further increase the distance between the edge of the first end surface 111 and the two corners 2011 of the adjacent electrode group 200.
[0035] Optionally, the plastic part 1 includes a body portion 12, with a protrusion 11 disposed on the body portion 12. The body portion 12 has a second side surface 121, which is on the same plane as the first side surface 112. That is, the inclined surface is disposed through the thickness direction of the plastic part 1, meaning that both ends of the plastic part 1 along the first direction are inclined sides, which facilitates the processing and molding of the plastic part 1. Of course, in other embodiments, the second side surface 121 of the body portion 12 can also be configured such that its extended surface is perpendicular to the first end surface 111, that is, there is a bending line between the second side surface 121 and the first side surface 112.
[0036] Optionally, in this embodiment, as Figure 3As shown, the maximum thickness 'a' of the plastic part 1 ranges from 5mm to 8mm, meaning that the maximum dimension of the plastic part 1 along its own thickness direction is 'a'. If this dimension 'a' is less than 5mm, the plastic part 1 is too thin, resulting in insufficient structural strength and susceptibility to deformation and failure under stress. Furthermore, when the inclination angle of the first side 112 remains unchanged, the overall thickness is too small, leading to a shortened distance between the first end face 111 and the two corners 2011 of the adjacent electrode group 200, which is detrimental to the effect of the protruding part 11 avoiding the corners 2011 of the electrode group 200. If this dimension 'a' is greater than 8mm, the plastic part 1 is too thick, which is beneficial for the protruding part 11 to avoid the corners 2011 of the electrode group 200. However, the plastic part 1 occupies too much space inside the battery cell, reducing the volumetric energy density of the battery cell. Therefore, to balance the volumetric energy density and safety performance of the battery cell, the maximum thickness 'a' of the plastic part 1 is set between 5mm and 8mm.
[0037] Optionally, the included angle α between the first side surface 112 and the first end surface 111 is in the range of 105°-120°. If the included angle α between the first side surface 112 and the first end surface 111 is less than 105°, the tilt angle of the first side surface 112 is too small. When the thickness of the protrusion 11 is constant, the tilt angle of the first side surface 112 being too small will result in the distance between the first end surface 111 and the two corners 2011 of the adjacent pole group 200 being too small, which is not conducive to the effect of the protrusion 11 avoiding the corners 2011 of the pole group 200. If the angle α between the first side surface 112 and the first end surface 111 is greater than 120°, the tilt angle of the first side surface 112 will be too large, which may easily lead to insufficient structural strength at this point. Furthermore, the area of the first end surface 111 will be too small, resulting in insufficient contact surface between the first end surface 111 and the second end surface 201 of the electrode group 200. This will cause excessive force concentration on the second end surface 201 of the electrode group 200, which may also easily damage the second end surface 201, causing minor deformation and negatively impacting the safety performance of the battery cell. Therefore, the angle α between the first side surface 112 and the first end surface 111 should be in the range of 105°-120°. This ensures that the protruding part 11 avoids the corner 2011 of the electrode group 200, preventing the corner 2011 of the electrode group 200 from being crushed, while also ensuring that the force on the second end surface 201 of the electrode group 200 is balanced, thereby improving the safety performance of the battery cell.
[0038] Optionally, a first side is formed between the first end face 111 and the first side face 112, and the distance between one end of the first side and the corner 2011 of the adjacent second end face 201 ranges from 3mm to 6mm. When this value is less than 3mm, due to processing errors, assembly errors, and possible elastic deformation of the protrusion 11, the first end face 111 may still contact the corner 2011 of the second end face 201. When this value is greater than 6mm, and when the thickness of the protrusion 11 is constant, the inclination angle of the first side face 112 will be too large, which may easily lead to a reduction in the structural strength of the protrusion 11, insufficient contact area between the first end face 111 of the protrusion 11 and the second end face 201 of the pole assembly 200, and excessive local stress. Therefore, the distance between one end of the first side and the corner 2011 of the adjacent second end face 201 is in the range of 3mm-6mm, which can ensure the avoidance effect of the protrusion 11 on the corner 2011 of the pole group 200 and the force balance of the second end face 201 of the pole group 200, thereby improving the safety performance of the battery cell.
[0039] Optionally, a chamfered structure 113 is provided on the first side of each of the two protrusions 11. In addition, chamfered structures 113 are also provided on both sides of the first end face 111 of the two protrusions 11 along the width direction of the plastic part 1, so as to ensure that the sides of the protrusions 11 that may come into contact with the edge of the electrode assembly 200 are provided with chamfered structures 113, so as to ensure that the edge of the electrode assembly 200 is not damaged by the plastic part 1.
[0040] Optionally, the dimension d of the chamfer structure 113 along the thickness direction of the plastic part 1 ranges from 0.8mm to 1.2mm to ensure a suitable distance between the edge of the first end face 111 and the edge of the second end face 201 of the electrode assembly 200, thereby ensuring the avoidance effect of the protrusion 11 on the edge of the electrode assembly 200. Similarly, if the dimension d of the chamfer structure 113 along the thickness direction of the plastic part 1 is greater than 1.2mm, the chamfer structure 113 is too large, which will affect the contact area between the first end face 111 and the second end face 201, and is not conducive to the force balance of the second end face 201.
[0041] Optionally, the first side 112 is provided with curved transitions 13 on both sides along the width direction of the plastic part 1 to prevent sharp edges from scratching the components inside the battery cell.
[0042] This embodiment also provides a battery cell, including a housing body (not shown in the figure) and the aforementioned cover structure 100, the cover structure 100 being sealed over the opening of the housing body. The battery cell also includes an electrode assembly 200, which is disposed within the housing body.
[0043] Optionally, in this embodiment, the positive and negative outputs are respectively located at both ends along the length of the shell body, and the length of the shell body is consistent with the thickness direction of the plastic part 1. Figure 1 The jk direction in the middle.
[0044] Optionally, the aforementioned cover plate structure 100 is disposed at the negative electrode, and a second cover plate 400 and an end plate 500 are disposed at the positive electrode. The end plate 500 is used to contact the other end face of the electrode assembly 200 and to provide bending space for the positive electrode tab. That is, the negative electrode output end is disposed on the cover plate structure 100, and the positive electrode output end is disposed on the second cover plate 400. Of course, in other embodiments, both ends of the cover plate can be disposed of as the aforementioned cover plate structure 100, without the end plate 500, or the aforementioned cover plate structure 100 can be disposed at the positive electrode, and the end plate 500 can be disposed at the negative electrode. Adjustments can be made according to actual needs.
[0045] Optionally, the compression of the electrode assembly 200 along the length of the casing body is in the range of 3mm-5mm to prevent the electrode assembly 200 from shaking within the casing body of the battery cell.
[0046] The assembly process of the battery cell includes: first, welding the negative electrode tab to the negative output terminal of the cover plate structure 100; then, wrapping the electrode assembly 200 with an insulating film ring, heat-sealing one end of the insulating film to the plastic part 1 of the cover plate structure 100 at the negative end, and heat-sealing the other end of the insulating film to the end plate 500 at the positive end. Next, pushing the electrode assembly 200 into the casing body to complete the casing installation; then welding the cover plate structure 100 to the casing body; welding the positive electrode tab to the positive output terminal on the second cover plate 400; and finally welding the second cover plate 400 to the casing body.
[0047] This battery cell, by tilting the first side 112 of the protrusion 11 of the plastic part 1 and providing a chamfered structure 113 at the edge of the first end face 111, allows the protrusion 11 to avoid the corners 2011 and edges of the second end face 201 of the electrode group 200, preventing the edges and corners 2011 of the electrode group 200 from being damaged by the plastic part 1. This avoids the plastic part 1 damaging the electrode group 200 during the insertion of the electrode group 200 into the casing, improving the battery cell's manufacturing yield. Furthermore, during subsequent use, the electrode group 200 may move inside the battery cell casing under conditions such as vibration and impact, increasing the interaction force between the protrusion 11 of the plastic part 1 of the cover plate structure 100 and the electrode group 200. However, since the protrusion 11 of the plastic part 1 avoids the edges and corners 2011 of the electrode group 200, damage and deformation of the edges and corners 2011 can be prevented, ensuring the safety performance of the battery cell.
[0048] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A cover plate structure, characterized in that, The device includes a plastic part (1), which has a protrusion (11). The first end face (111) of the protrusion (11) abuts against the second end face (201) of the electrode assembly (200). The first side face (112) of the protrusion (11) is inclined and tilted toward the second end face (201). The first side face (112) and the second end face (201) together form a clearance space (300). At least one end of the two ends of the second end face (201) that are arranged opposite each other along a first direction is located in the clearance space (300). The edge of the first end face (111) has a chamfer structure (113), which is arranged corresponding to the edge of the second end face (201). The first direction is the length direction of the plastic part (1).
2. The cover plate structure according to claim 1, characterized in that, The plastic part (1) has two protrusions (11), which are respectively disposed at opposite ends of the plastic part (1) along the first direction. One end of the second end face (201) disposed opposite to each other along the first direction is located in the clearance space (300) of one of the protrusions (11), and the other end of the second end face (201) disposed opposite to each other along the first direction is located in the clearance space (300) of the other protrusion (11).
3. The cover plate structure according to claim 1, characterized in that, The first side edge between the first side surface (112) and the first end surface (111) is parallel to the width direction of the plastic part (1).
4. The cover plate structure according to claim 1, characterized in that, The plastic part (1) includes a body part (12), the protrusion (11) is disposed on the body part (12), the body part (12) has a second side surface (121), the second side surface (121) and the first side surface (112) are on the same plane.
5. The cover plate structure according to any one of claims 1-4, characterized in that, The maximum thickness a of the plastic part (1) ranges from 5mm to 8mm.
6. The cover plate structure according to any one of claims 1-4, characterized in that, The angle α between the first side surface (112) and the first end surface (111) ranges from 105° to 120°.
7. The cover plate structure according to any one of claims 1-4, characterized in that, The first end face (111) and the first side face (112) have a first side, and the distance between one end of the first side and the corner (2011) of the adjacent second end face (201) is in the range of 3mm-6mm.
8. The cover plate structure according to any one of claims 1-4, characterized in that, The dimension d of the chamfer structure (113) along the thickness direction of the plastic part (1) ranges from 0.8mm to 1.2mm.
9. The cover plate structure according to any one of claims 1-4, characterized in that, The first side surface (112) is provided with curved transition (13) at both sides along the width direction of the plastic part (1).
10. A battery cell, characterized in that, It includes a shell body and a cover structure as described in any one of claims 1-9, wherein the cover structure (100) is provided to seal the opening of the shell body.