Cover plate assembly, battery cell and battery pack

Abstract

The utility model relates to the technical field of battery cells, and discloses a cover plate assembly, a battery cell and a battery pack, the cover plate assembly comprises a cover plate body, a first insulating part, a pole, a second insulating part and a sealing part, according to the cover plate assembly of the structure, the boss part is arranged on the cover plate body on the periphery of the pole hole, the boss part is arranged on the top face of the cover plate body in a protruding mode and surrounds the pole hole by a circle, the height f of the boss part is larger than or equal to 0.3 mm and smaller than or equal to 10 mm, the height of the boss part is enough, electrolyte emerging from the liquid injection hole can be effectively shielded, the electrolyte is prevented from flowing into the pole hole, and the service life of the electrolyte is prolonged. Short circuit in the pole region is avoided, and the safety performance of the battery cell can be effectively improved. Meanwhile, the height f of the boss part is less than or equal to 10mm, so that the boss part can be prevented from occupying excessive space outside the battery cell due to overhigh height, and the influence on the volume energy density of the battery cell is avoided.

Description

Technical Field

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

[0002] The battery cell comprises a cover plate assembly, a housing, and electrode groups. The cover plate assembly includes a cover plate body, electrode posts, a first insulating component, a second insulating component, and a sealing component. The cover plate body has electrode post holes and electrolyte injection holes. The electrode posts and sealing components are installed inside the electrode post holes, and the electrolyte injection holes are located on one side of the electrode post holes. After the battery cell is assembled, electrolyte is injected into the battery cell through the electrolyte injection holes. During this process, electrolyte leakage can easily occur. The electrolyte leaking from the electrolyte injection holes can easily flow along the surface of the cover plate body into the electrode post area, causing a short circuit path to form in the electrode post area, resulting in insulation failure of the first insulating component and seriously affecting the safety performance of the battery cell. Utility Model Content

[0003] In view of this, the present invention provides a cover plate assembly, a battery cell, and a battery pack to solve the problem in the prior art where, during the electrolyte injection process, the electrolyte overflows and flows into the terminal area, causing a short circuit in the terminal area.

[0004] In a first aspect, this utility model provides a cover plate assembly, comprising:

[0005] The cover plate body has an electrode post hole and an injection hole, the injection hole being located on one side of the electrode post hole; a boss is provided around the cover plate body outside the electrode post hole, the boss protruding from the top surface of the cover plate body by a height f, 0.3mm≤f≤10mm;

[0006] A first insulating element is provided on the protrusion portion;

[0007] A pole post is disposed in the pole post hole, and the top of the pole post abuts against the top surface of the first insulating member;

[0008] The second insulating element is disposed on the bottom surface of the cover plate body; the bottom of the pole abuts against the bottom surface of the second insulating element;

[0009] A sealing element is fitted onto the pole post.

[0010] Beneficial Effects: When using this cover plate assembly, it is installed on the opening of the battery cell housing. After the battery cell assembly is complete, electrolyte is injected into the battery cell through the injection port. A protrusion is provided on the cover plate body around the terminal hole. The protrusion protrudes from the top surface of the cover plate body and surrounds the terminal hole. The height f of the protrusion satisfies 0.3mm≤f≤10mm. The height of the protrusion is sufficient to effectively block electrolyte from escaping from the injection port, preventing electrolyte from flowing into the terminal hole and avoiding short circuits in the terminal area, thus effectively improving the safety performance of the battery cell. Simultaneously, the height f≤10mm prevents the protrusion from being too tall and occupying too much space outside the battery cell, avoiding affecting the volumetric energy density of the battery cell. After multiple battery cells are assembled into a group, the space between the top surface of the protrusion and the top surface of the cover plate body is used to accommodate the busbar connecting different battery cells. The thickness of the busbars varies between different products, causing the top surface of the busbar to easily extend beyond the top surface of the battery cell after assembly in some products. After the cover plate body is provided with the boss, the distance between the top surface of the cover plate body and the top surface of the boss can be adjusted by adjusting the thickness of the boss. At the same time, the distance between the top surface of the pole and the top surface of the cover plate body can be adjusted. Busbars of different thicknesses between adjacent cells can be accommodated in the area between the boss and the cover plate body, reducing the height occupied by the busbar in this area beyond the height of the cell. This can adapt to the spatial arrangement requirements of busbars in different modules.

[0011] In one optional embodiment, the thickness of the boss portion is b, where 0.8 mm ≤ b ≤ 10 mm;

[0012] The protrusion extends toward the inside of the pole hole to form an extension section, and the width of the area where the protrusion overlaps with the cover plate body is c, where 0.5mm≤c≤10mm.

[0013] Beneficial effects: A thickness b ≥ 0.8 mm effectively ensures the thickness of the boss, guaranteeing sufficient strength to support the electrode post and ensure stable contact with the first insulating component, preventing deformation and failure of the surrounding structure under stress. Simultaneously, b ≤ 10 mm keeps the boss thickness within a suitable range, preventing excessive thickness from occupying too much space in the cell's height direction, thus ensuring the cell's volumetric energy density. Furthermore, setting an upper limit on the boss thickness facilitates processing and reduces processing costs.

[0014] The extension section increases the overall width of the boss, enabling it to effectively support the first insulating component and the pole. Simultaneously, the width c of the overlapping area between the boss and the cover plate satisfies c≥0.5mm. This design ensures sufficient overlap between the boss and the cover plate, thereby improving the structural strength of the boss. The pole, supported by the boss, effectively enhances its structural strength under Z-direction stress.

[0015] In one optional embodiment, the depth between the bottom surface of the extension section and the bottom surface of the cover plate body is h, where 0mm ≤ h ≤ 10mm;

[0016] The width of the extension section extending toward the inside of the pole hole is w, where 1mm ≤ w ≤ 100mm.

[0017] Beneficial effect: 0mm≤h≤10mm. This setting can prevent h from being too high and affecting the strength and stability of the boss, thereby improving the support effect of the boss on the pole, and thus improving the structural strength of the pole under Z-direction force, preventing the plastic deformation failure of the surrounding structure of the pole under force.

[0018] 1mm≤w≤100mm. This setting prevents the extension section from being too wide, ensuring its strength and stability to effectively support the pole and guarantee its Z-axis load-bearing performance. w≥1mm allows the punch to press the cover plate body and form the boss.

[0019] In one alternative implementation,

[0020] Beneficial effects: This setting allows the width w and thickness b of the extension section to satisfy a certain ratio relationship, so that the two change proportionally. When the extension section is widened, it is necessary to appropriately thicken the extension section. When the extension section is thick, it is also necessary to widen the extension section at the same time. This effectively ensures the strength of the extension section and the boss, improves the support strength of the boss, and improves the Z-direction force performance of the pole.

[0021] In one alternative implementation,

[0022] Beneficial effect: This setting allows the depth h to vary proportionally with the thickness b of the extension section. That is, when the depth h between the bottom surface of the extension section and the bottom surface of the cover plate body is large, the thickness of the extension section is increased accordingly, thereby ensuring the strength and stability of the boss.

[0023] In one alternative implementation,

[0024] In one optional embodiment, the thickness of the cover plate body is a, where 1mm ≤ a ≤ 10mm.

[0025] Beneficial effects: This design ensures the support of the cover plate body and prevents the cover plate body from deforming or tearing when the pole is under force.

[0026] In one alternative embodiment, the width of the orthographic projection of the flange at the top of the pole post onto the boss portion is e, where 0.5mm ≤ e ≤ 10mm.

[0027] Beneficial effect: By controlling the width of the flange within a moderate range, it can ensure the support width of the boss on the pole post, and also facilitate the stamping and forming of the flange on the top of the pole post.

[0028] Secondly, this utility model also provides a battery cell, comprising the cover plate assembly, housing, and electrode assembly as described above, wherein the electrode assembly is disposed within the housing, and the cover plate assembly is disposed on the opening of the housing. The battery cell including the cover plate assembly has the same technical effects as the cover plate assembly, and will not be described further here.

[0029] Thirdly, this utility model also provides a battery pack, including the aforementioned battery cells. The battery pack includes a cover assembly, which has the same technical effects as the cover assembly, and will not be described in detail here. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific 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.

[0031] Figure 1 This is a top view of a cover plate assembly according to an embodiment of the present utility model;

[0032] Figure 2 for Figure 1 Sectional view along the middle AA direction;

[0033] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0034] Figure 4 for Figure 2 A magnified view of part A in the middle;

[0035] Figure 5 This is a schematic diagram of a cover plate assembly according to an embodiment of the present utility model;

[0036] Figure 6 This is an exploded view of a cover plate assembly according to an embodiment of the present utility model.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Cover plate body; 11. Pole post hole; 12. Liquid injection hole; 13. Boss part; 131. Extension section; 2. First insulating component; 3. Pole post; 4. Second insulating component; 5. Sealing component. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments 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 protection scope of this utility model.

[0040] In related technologies, the top surface of the cover plate body 1 of the battery cell is flat. The cover plate body 1 is provided with a terminal hole 11 and an injection hole 12. The first insulating member 2 is disposed on the top surface of the cover plate body 1, and the terminal 3 is disposed in the terminal hole 11. The flange at the top of the terminal 3 abuts against the top surface of the first insulating member 2. When electrolyte is injected into the battery cell through the injection hole 12, electrolyte overflow is likely to occur. Since the top surface of the cover plate body 1 is flat, the electrolyte overflowing from the injection hole 12 flows along the top surface of the cover plate body 1 to the terminal 3. The electrolyte flows into the terminal hole 11 through the gap between the first insulating member and the cover plate body 1, which can easily lead to the formation of a short circuit channel in the terminal 3 area, affecting the safety performance of the battery cell.

[0041] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0042] According to an embodiment of the present invention, a cover plate assembly is provided, including a cover plate body 1, a first insulating member 2, an electrode post 3, a second insulating member 4, and a sealing member 5. The cover plate body 1 has an electrode post hole 11 and an injection hole 12, with the injection hole 12 located on one side of the electrode post hole 11. A boss portion 13 is provided around the cover plate body 1 outside the electrode post hole 11, with the boss portion 13 protruding from the top surface of the cover plate body 1 at a height f, where 0.3mm ≤ f ≤ 10mm. The first insulating member 2 is disposed on the boss portion 13. The electrode post 3 is disposed inside the electrode post hole 11, with its top abutting against the top surface of the first insulating member 2. The second insulating member 4 is disposed on the bottom surface of the cover plate body 1, with the bottom of the electrode post 3 abutting against the bottom surface of the second insulating member 4. The sealing member 5 is sleeved on the electrode post 3.

[0043] When using this cover plate assembly, it is installed on the opening of the cell housing. After the cell assembly is complete, electrolyte is injected into the cell through the injection hole 12. A boss 13 is provided on the cover plate body 1 around the electrode hole 11. The boss 13 protrudes from the top surface of the cover plate body 1 and surrounds the electrode hole 11. The height f of the boss 13 satisfies 0.3mm≤f≤10mm. The height of the boss 13 is sufficient to effectively block the electrolyte escaping from the injection hole 12, preventing the electrolyte from flowing into the electrode hole 11 and avoiding short circuits in the electrode 3 area, thus effectively improving the safety performance of the cell. At the same time, the height f≤10mm of the boss 13 prevents the boss 13 from being too tall and occupying too much space outside the cell, thus avoiding affecting the volumetric energy density of the cell. After multiple battery cells are assembled into a group, the space between the top surface of the boss portion 13 and the top surface of the cover plate body 1 is used to accommodate busbars connecting different battery cells. The thickness of the busbars of different products is not consistent, which causes the top surface of the busbar to easily exceed the top surface of the battery cell after some products are assembled. After the boss portion 13 is provided on the cover plate body 1, the distance between the top surface of the cover plate body 1 and the top surface of the boss portion 13 can be adjusted by adjusting the thickness of the boss portion 13. At the same time, the distance between the top surface of the terminal post 3 and the top surface of the cover plate body 1 can be adjusted. This allows busbars of different thicknesses between adjacent battery cells to be accommodated in the area between the boss portion 13 and the cover plate body 1, reducing the height occupied by the busbars in this area beyond the height of the battery cells, and adapting to the space arrangement requirements of busbars in different modules.

[0044] The first insulating member 2 is disposed on the top surface of the boss portion 13. The flange at the top of the electrode post 3 is pressed onto the first insulating member 2. The boss portion 13 supports the electrode post 3. When the electrode post 3 is subjected to external force, if the supporting force of the boss portion 13 is insufficient, the structure around the electrode post 3, such as the first insulating member 2, is at risk of plastic deformation failure, which may lead to deformation failure of the structure around the electrode post 3 and affect the safety performance of the battery cell. In some embodiments, such as Figure 3 As shown, the thickness of the boss portion 13 is b, where 0.8mm ≤ b ≤ 10mm and b ≥ 0.8mm. This setting effectively ensures the thickness of the boss portion 13, thereby guaranteeing sufficient strength to effectively support the electrode post 3 and stably press the electrode post 3 onto the first insulating member 2, preventing deformation and failure of the surrounding structure of the electrode post 3 under stress. Simultaneously, b ≤ 10mm keeps the thickness of the boss portion 13 within a suitable range, preventing excessive thickness from occupying too much space in the height direction of the cell, thus ensuring the volumetric energy density of the cell. Furthermore, setting an upper limit on the thickness of the boss portion 13 facilitates its processing and saves on processing costs.

[0045] like Figure 3 and Figure 4As shown, in some embodiments, the boss portion 13 extends towards the inner side of the pole hole 11 to form an extension section 131. The width of the overlapping area between the boss portion 13 and the cover plate body 1 is c, where 0.5mm ≤ c ≤ 10mm. The extension section 131 can increase the overall width of the boss portion 13, enabling it to effectively support the first insulating member 2 and the pole 3. Simultaneously, the width c of the overlapping area between the boss portion 13 and the cover plate body 1 satisfies c ≥ 0.5mm. This arrangement ensures sufficient overlap between the boss portion 13 and the cover plate, thereby improving the structural strength of the boss portion 13. The pole 3 is supported on the boss portion 13, effectively increasing its structural strength under Z-direction stress.

[0046] Alternatively, in some embodiments, such as Figure 3 and Figure 4 As shown, the depth between the bottom surface of the extension section 131 and the bottom surface of the cover plate body 1 is h, where 0mm ≤ h ≤ 10mm. If the depth between the bottom surface of the extension section 131 and the bottom surface of the cover plate body 1 is too high, it will reduce the strength and stability of the boss portion 13 structure. Therefore, h is made to satisfy 0mm ≤ h ≤ 10mm to prevent h from being too high and affecting the strength and stability of the boss portion 13. This improves the support effect of the boss portion 13 on the pole post 3, thereby increasing the structural strength of the pole post under Z-direction stress and preventing plastic deformation failure of the surrounding structure of the pole post 3 under stress.

[0047] In some embodiments, such as Figure 3 As shown, the width of the extension section 131 extending towards the inner side of the pole hole 11 is w, where 1mm ≤ w ≤ 100mm. The extension section 131 extends outward to form a cantilever structure. If w is too large, the cantilever structure will be too long, which will seriously affect the strength and stability of the boss portion 13. To avoid this problem, w is controlled between 1mm and 100mm. This setting can prevent the width of the extension section 131 from being too large, ensuring the strength and stability of the extension section 131 so that it can effectively support the pole 3 and ensure the Z-direction force performance of the pole 3. The boss portion 13 is formed by stamping. The bottom surface of the cover plate body 1 is initially flat. The cover plate body 1 in the outer peripheral area of ​​the pole hole 11 is stamped to make the top surface of the cover plate body 1 protrude to form the boss portion 13. To facilitate stamping, w ≥ 1mm is made so that the punch can stamp the cover plate body 1 and form the boss portion 13.

[0048] like Figure 3 and Figure 4 As shown, after the boss part 13 is stamped, its top surface is flat, and the top surface of the boss part 13 is parallel to the top surface of the cover plate body 1.

[0049] The extension segment 131 has a width of w and a thickness of b. If the extension segment 131 is too wide but too thin, or too thick but too narrow, the overall strength of the extension segment 131 and the boss portion 13 cannot be guaranteed. To ensure the strength and support of the extension segment 131 and the boss portion 13, in some embodiments, the extension segment 131 is made to have a width of w and a thickness of b. To ensure that the width w and thickness b of the extension segment 131 satisfy a certain ratio, making them change proportionally, when the extension segment 131 is widened, it needs to be appropriately thickened; conversely, when the extension segment 131 is already thick, it also needs to be widened simultaneously. This effectively guarantees the strength of the extension segment 131 and the boss portion 13, improves the support strength of the boss portion 13, and enhances the Z-direction load-bearing performance of the pole post. Simultaneously, the width w and thickness b of the extension segment 131 satisfy... This setting allows the ratio of the two to be controlled within a suitable range, so that the width and thickness ratio of the extension 131 are coordinated, which facilitates the stamping and forming of the boss portion 13.

[0050] The depth between the bottom surface of the extension 131 and the bottom surface of the cover plate body 1 is h, and the thickness of the extension 131 is b. If h is large and b is small, the boss 13 will form a tall leg structure on the cover plate body 1, which will affect the strength and stability of the boss 13. Therefore, in some embodiments, such as Figure 3 and Figure 4 As shown, this makes The depth h is proportional to the thickness b of the extension section 131. That is, when the depth h between the bottom surface of the extension section 131 and the bottom surface of the cover plate body 1 is large, the thickness of the extension section 131 is increased accordingly to ensure the strength and stability of the boss part 13.

[0051] Similarly, the depth between the bottom surface of the extension 131 and the bottom surface of the cover plate body 1 is h, and the width of the overlapping area between the boss portion 13 and the cover plate body 1 is c. If the value of h is high and the value of c is too small, the bottom of the extension portion will be suspended at a greater depth, while the width of the boss portion 13 overlapping the cover plate body 1 will be smaller. This results in lower structural strength and stability of the boss portion 13. Therefore, in some embodiments, h and c are made to satisfy... To make the two change proportionally, that is, when the overhang depth at the bottom of the extension section 131 is deeper, the overlap width between the boss part 13 and the cover plate body 1 is increased accordingly, so as to ensure the strength and stability of the boss part 13, ensure the support effect of the boss part 13 on the pole post 3, thereby improving the Z-direction force capacity of the pole post 3 and preventing the deformation and failure of the surrounding structure of the pole post 3.

[0052] The cover plate body 1 supports the pole post 3, the first insulating element 2, and the second insulating element 4, among other structures. If the cover plate body 1 is too thin, insufficient strength in the cover plate body 1 under Z-axis force on the pole post can lead to deformation or tearing of the cover plate body 1. To ensure the strength of the cover plate body 1, in some embodiments, such as... Figure 3 As shown, the thickness of the cover plate body 1 is a, 1mm≤a≤10mm. This setting can ensure the support of the cover plate body 1 and prevent the cover plate body 1 from deforming or being torn when the pole post 3 is under force.

[0053] Optionally, in some embodiments, the cover plate body 1 includes a sheet of light aluminum. In some embodiments, the thickness of the light aluminum sheet is 1.5 mm or 2 mm.

[0054] The width of the flange at the top of the electrode post 3 projected onto the boss portion 13 is e. During cell assembly, the sealing member 5 is fitted onto the electrode post 3. The bottom of the electrode post 3 has a ring of abutment, and the top surface of the electrode post 3 has a ring of annular vertical wall. The electrode post 3 is passed through the electrode post hole 11 from bottom to top. The first insulating member 2 is located on the top surface of the boss portion 13. The top surface of the electrode post 3 is then stamped so that the annular vertical wall at the top of the electrode post 3 is flanged outward and pressed against the top of the first insulating member 2. When the electrode post 3 is subjected to force, it transmits the external force to the boss portion 13 through the flange. If the width of the flange is small, the boss portion 13 cannot effectively support the electrode post 3. If the flange is too large, it is difficult to stamp and form the flange. To avoid these problems, in some embodiments, e is made to satisfy 0.5mm≤e≤10mm, so as to control the width of the flange within a moderate range. This ensures the support width of the boss 13 for the pole post 3 and facilitates the stamping and forming of the flange on the top of the pole post 3.

[0055] like Figure 6 As shown, in some embodiments, the opening in the middle of the boss portion 13 is in the shape of a circular hole, the outer contour of the boss portion 13 is rectangular, and it has a rounded structure at its corners.

[0056] Optionally, in some embodiments, the first insulating member 2 includes an upper plastic, the second insulating member 4 includes a lower plastic, and the sealing member 5 includes a sealing ring.

[0057] A cover plate assembly with different values ​​of a, c, w, b, h, and e was designed. After the battery cells were welded to the busbar, they were assembled into a battery pack. The Z-axis push-pull force was tested on the battery cells, and the cover plate assembly was observed to show any obvious plastic deformation. The test results are shown in Table 1.

[0058] Table 1

[0059]

[0060] As can be seen from Examples 1 to 8, when a, c, w, b, h, and When all parameters are between their upper and lower limits, the boss portion can stably and effectively support the electrode post, and the cover assembly will not undergo plastic deformation after the cell undergoes a Z-axis stress test. As shown in Example 9, when h exceeds the upper limit, When the upper limit is exceeded, while other parameters are within the normal range, the cover plate assembly exhibits significant plastic deformation after the Z-axis stress test, rendering the cover plate assembly unqualified; as shown in Example 10, when When the upper limit is exceeded, while other parameters are within the normal range, the cover plate assembly exhibits significant plastic deformation after the Z-axis stress test, rendering the cover plate assembly unqualified; as shown in Example 11, when When the upper limit is exceeded, and other parameters are within the normal range, the cover plate assembly exhibits significant plastic deformation after the Z-axis stress test of the battery cell, and the cover plate assembly is unqualified. As can be seen from Example 12, when e exceeds the lower limit, and other parameters are within the normal range, the cover plate assembly exhibits significant plastic deformation after the Z-axis stress test of the battery cell, and the cover plate assembly is unqualified.

[0061] According to an embodiment of the present invention, another aspect provides a battery cell, including the aforementioned cover plate assembly, housing, and electrode assembly, wherein the electrode assembly is disposed inside the housing, and the cover plate assembly is disposed on the opening of the housing.

[0062] In this battery cell structure, a boss 13 is provided on the cover plate body 1 surrounding the terminal hole 11. The height f of the boss 13 satisfies 0.3mm≤f≤10mm, which can effectively block the electrolyte escaping from the injection hole 12, preventing the electrolyte from flowing into the terminal hole 11 and avoiding short circuits in the terminal 3 area, thus effectively improving the safety performance of the battery cell. At the same time, the height f≤10mm of the boss 13 can prevent the boss 13 from being too high and occupying too much space outside the battery cell, thus avoiding affecting the volumetric energy density of the battery cell. The distance between the top surface of the cover plate body 1 and the top surface of the boss 13 can also be adjusted by the boss 13, so that busbars of different thicknesses between adjacent battery cells can be accommodated in the area between the boss 13 and the cover plate body 1, reducing the height occupied by the busbars in this area and adapting to the spatial arrangement requirements of busbars in different modules.

[0063] According to an embodiment of the present invention, another aspect of a battery pack includes the aforementioned battery cell.

[0064] In this battery pack structure, the cells have protrusions 13 on the cover body 1 surrounding the terminal hole 11. The height f of the protrusions 13 satisfies 0.3mm ≤ f ≤ 10mm, which effectively blocks the electrolyte escaping from the injection hole 12, preventing electrolyte from flowing into the terminal hole 11 and avoiding short circuits in the terminal 3 area, thus effectively improving the safety performance of the cells and the battery pack. Simultaneously, the height f ≤ 10mm of the protrusions 13 prevents them from being too high and occupying too much space outside the cells, thereby improving the volumetric efficiency of the battery pack.

[0065] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate body has an electrode post hole and an injection hole, the injection hole being located on one side of the electrode post hole; a boss is provided around the cover plate body outside the electrode post hole, the boss protruding from the top surface of the cover plate body by a height f, 0.3mm≤f≤10mm; A first insulating element is provided on the protrusion portion; A pole post is disposed in the pole post hole, and the top of the pole post abuts against the top surface of the first insulating member; The second insulating element is disposed on the bottom surface of the cover plate body; the bottom of the pole abuts against the bottom surface of the second insulating element; A sealing element is fitted onto the pole post.

2. The cover plate assembly according to claim 1, characterized in that, The thickness of the boss portion is b, where 0.8mm ≤ b ≤ 10mm; The protrusion extends toward the inside of the pole hole to form an extension section, and the width of the area where the protrusion overlaps with the cover plate body is c, where 0.5mm≤c≤10mm.

3. The cover plate assembly according to claim 2, characterized in that, The depth between the bottom surface of the extension section and the bottom surface of the cover plate body is h, where 0mm≤h≤10mm; The width of the extension section extending toward the inside of the pole hole is w, where 1mm ≤ w ≤ 100mm.

4. The cover plate assembly according to claim 3, characterized in that, 5. The cover plate assembly according to claim 3, characterized in that, 6. The cover plate assembly according to claim 3, characterized in that, 7. The cover plate assembly according to any one of claims 1 to 6, characterized in that, The thickness of the cover plate body is a, where 1mm ≤ a ≤ 10mm.

8. The cover plate assembly according to any one of claims 1 to 6, characterized in that, The width of the flange at the top of the pole post projected onto the boss portion is e, where 0.5mm ≤ e ≤ 10mm.

9. A battery cell, characterized in that, The invention includes a cover plate assembly, a housing, and an electrode assembly as described in any one of claims 1 to 8, wherein the electrode assembly is disposed within the housing, and the cover plate assembly is disposed on an opening in the housing.

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

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