Cover plate, battery cell and battery pack

Abstract

The utility model relates to battery technical field discloses a cover plate, electric core and battery package, the utility model discloses a cover plate includes cover plate body, first insulating piece and pole. The positioning portion abuts the positioning groove, and the wide side of the bottom plate is spaced apart with the horizontal protruding portion adjacent to the bottom plate. The cover plate of this structure is provided with the positioning portion in the middle region of the length direction of the horizontal protruding portion, and the positioning portions on both sides of the length direction of the pole bottom plate abut the positioning groove respectively to limit the wide side of the bottom plate, and the positioning portion extends a distance towards the bottom plate, so that the wide side of the bottom plate is spaced apart with the horizontal protruding portion, the spacing of the horizontal protruding portion and the wide side of the bottom plate is increased, the electrolyte can flow out from the big gap between the two, can prevent the electrolyte to accumulate between the bottom plate and the horizontal protruding portion, thereby can prevent the electrolyte and the pole piece from happening chemical reaction and generating granular object, avoid granular object to increase the on-pole and cover plate body, can guarantee the performance of electric core.

Description

Technical Field

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

[0002] The cover plate includes a riveting block, a first insulating component, a cover plate body, a second insulating component, an electrode post, and a sealing ring. The electrode post includes a base plate and a post body. The electrode post base plate and the riveting block clamp the cover plate components between them. The top of the post body is riveted to the riveting block, and the connection between the electrode post and the riveting block is reinforced by laser welding. The first insulating component is located on the inner side of the surface of the cover plate body facing the inner side of the cover plate. The electrode post base plate is located on the inner side of the surface of the first insulating component facing the inner side of the cover plate. The first insulating component has an edge protrusion along its width direction. Between the two edge protrusions, there are multiple transverse protrusions extending along the width direction of the first insulating component. The two long sides of the electrode post base plate abut against the edge protrusions to limit the long sides of the electrode post base plate. The two wide sides of the electrode post base plate abut against the transverse protrusions to limit the wide sides of the electrode post base plate.

[0003] The inventors discovered that after the cover plate is assembled into a battery cell, electrolyte tends to accumulate in the gap between the wide side of the terminal base plate and the lateral protrusion during battery use. During battery charging and discharging, the electrolyte reacts chemically with the electrode, causing granular objects to grow in the gap between the wide side of the terminal base plate and the lateral protrusion. As the number of granular objects increases, they tend to overflow onto the cover plate body, causing a short circuit between the terminal and the cover plate body, leading to battery cell failure. Utility Model Content

[0004] In view of this, the present invention provides a cover plate, a battery cell, and a battery pack to solve the problem in the prior art where electrolyte easily accumulates in the gap between the wide side of the electrode base plate and the transverse protrusion of the first insulating member, leading to battery cell failure.

[0005] In a first aspect, this utility model provides a cover plate, comprising:

[0006] Cover plate body;

[0007] A first insulating member is disposed on the inner side of one side surface of the cover plate body facing the inner side of the cover plate; the first insulating member is provided with two edge protrusions and at least two transverse protrusions on one side surface facing the inner side of the cover plate, the two edge protrusions are disposed on both sides of the width direction of the first insulating member, and the at least two transverse protrusions extend along the width direction of the first insulating member and are spaced apart between the two edge protrusions along the length direction of the first insulating member.

[0008] The pole includes a base plate and a column portion disposed on the base plate, the column portion passing through the first insulating member and the cover plate body; the base plate is located inside the surface of the first insulating member facing the inner side of the cover plate, and the base plate is located between two of the transverse protrusions; the middle region of the transverse protrusions adjacent to the base plate in the length direction is provided with a positioning portion extending toward the base plate, the base plate is provided with a positioning groove, the positioning portion abuts against the positioning groove, and the wide side of the base plate is spaced apart from the transverse protrusions adjacent to the base plate.

[0009] Beneficial effects: The cover plate of this structure has a positioning part in the middle area of ​​the transverse protrusion along its length. The positioning parts on both sides of the base plate along its length abut against the positioning groove to limit the width of the base plate. At the same time, the positioning part extends a certain distance toward the base plate, so that the width of the base plate is separated from the transverse protrusion, increasing the distance between the transverse protrusion and the width of the base plate. This facilitates the flow of electrolyte from the large gap between the two, preventing electrolyte from accumulating between the base plate and the transverse protrusion. This prevents the electrolyte from reacting chemically with the electrode to produce particulate matter, avoids the increase of particulate matter, and ensures the performance of the battery cell.

[0010] In one optional embodiment, the distance between the base plate and the transverse protrusion is D, where 1mm ≤ D ≤ 10mm.

[0011] Beneficial effects: D≥1mm, this setting can prevent the electrolyte from accumulating easily due to the small gap between the base plate and the transverse protrusion; D≤10mm, this setting can avoid the positioning part being too long and affecting the strength of the positioning part. By limiting the upper limit of the length of the positioning part, the strength of the positioning part can be guaranteed, thereby ensuring the positioning effect of the positioning part on the pole base plate.

[0012] In one alternative embodiment, the end face of the positioning part facing the base plate is arc-shaped, and the positioning groove is an arc-shaped groove.

[0013] In one optional embodiment, the end face of the positioning part facing the base plate is an arc surface, the diameter of the arc surface is d, 1.5mm≤d≤5mm; the positioning groove is an arc groove.

[0014] Beneficial effects: D≥1.5mm ensures the minimum diameter of the positioning part's end, thus guaranteeing its strength and positioning effect on the base plate. d≤5mm prevents the diameter of the positioning part's end from being too large, ensuring the positioning effect on the base plate while also preventing the positioning groove opening from being too large and affecting the base plate's strength.

[0015] In one optional embodiment, the column portion and the base plate are separately disposed, and the base plate has a mounting groove on the side facing the column portion; the column portion has a mounting plate on the side facing the base plate, the mounting plate is embedded in the mounting groove, and the mounting plate is welded to the base plate.

[0016] Beneficial effects: This design allows for the selection of base plates with different sizes based on the welding area requirements of different base plates and electrode tabs, improving the interchangeability and replaceability of the electrode base plates. Furthermore, the separate design of the column body and base plate allows for separate processing, significantly saving materials and reducing material costs.

[0017] In one optional embodiment, the mounting plate has a positioning protrusion on the side facing the base plate, and the base plate has a positioning hole, with the positioning protrusion inserted into the positioning hole.

[0018] In one optional embodiment, the thickness of the base plate is H along the thickness direction of the cover plate, and the thickness of the positioning protrusion is H1, where 1 / 3 ≤ H1 / H ≤ 2 / 3.

[0019] In one optional embodiment, the long sides of the mounting plate and the positioning protrusion extend along the length direction of the first insulating member, the length of the mounting plate is L, the length of the positioning protrusion is L1, and 2 / 5 ≤ L1 / L ≤ 4 / 5.

[0020] Secondly, this utility model also provides a battery cell, including a housing and a cover plate as described above, wherein the housing has an opening and the cover plate is disposed on the opening. The battery cell including the cover plate has the same technical effects as the cover plate, and will not be described again here.

[0021] Thirdly, this utility model also provides a battery pack, including the aforementioned battery cells. The battery pack includes a cover plate, which has the same technical effects as the cover plate, and will not be described in detail here. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a three-dimensional structural diagram of a cover plate from a first angle according to an embodiment of the present utility model;

[0024] Figure 2 for Figure 1 The bottom view of the cover plate shown;

[0025] Figure 3 for Figure 1 A schematic diagram of the cover plate from a second angle;

[0026] Figure 4 for Figure 1 The top view of the cover plate shown;

[0027] Figure 5 for Figure 4 Sectional view along axis AA;

[0028] Figure 6 for Figure 4 Sectional view along axis AA (including dimension markings);

[0029] Figure 7 for Figure 1 The exploded view of the cover plate is shown.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Cover plate body; 2. First insulating component; 21. Edge protrusion; 22. Lateral protrusion; 23. Positioning part; 3. Pole post; 31. Base plate; 311. Positioning groove; 312. Mounting groove; 313. Positioning hole; 32. Column part; 321. Mounting plate; 322. Positioning protrusion; 4. Riveting block; 5. Second insulating component; 6. Sealing component. Detailed Implementation

[0032] 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.

[0033] In the related technology, the first insulating member of the cover plate has an edge protrusion along its width direction, and a plurality of transverse protrusions extending along the width direction of the first insulating member are provided between the two edge protrusions. The two long sides of the pole base plate abut against the edge protrusions to limit the long sides of the pole base plate; the two long sides of the pole base plate abut against the transverse protrusions to limit the wide sides of the pole base plate.

[0034] The inventors discovered that after the cover plate is assembled into a battery cell, during use, the cover plate is placed vertically, and there is a small gap between the wide side of the base plate of the terminal post and the horizontal protrusion. Electrolyte easily accumulates in the small gap between the base plate and the horizontal protrusion. During the charging and discharging of the battery, the electrolyte reacts chemically with the electrode, and granular objects grow in the gap between the wide side of the base plate of the terminal post and the horizontal protrusion. As the number of granular objects increases, they easily overflow onto the cover plate body. The granular objects conduct electricity between the terminal post and the cover plate body, causing a short circuit between the terminal post and the cover plate body, leading to battery cell failure.

[0035] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0036] According to an embodiment of the present invention, a cover plate is provided, comprising a cover plate body 1, a first insulating member 2, and a pole post 3.

[0037] The first insulating member 2 is disposed on the inner side of the surface of the cover plate body 1 facing the inner side of the cover plate; the surface of the first insulating member 2 facing the inner side of the cover plate is provided with two edge protrusions 21 and at least two transverse protrusions 22, the two edge protrusions 21 are disposed on both sides of the width direction of the first insulating member 2, and the at least two transverse protrusions 22 extend along the width direction of the first insulating member 2 and are spaced apart between the two edge protrusions 21 along the length direction of the first insulating member 2; the pole post 3 includes a base plate 31 and a post disposed on the base plate 31. The column portion 32 passes through the first insulating member 2 and the cover plate body 1; the bottom plate 31 is located on the inner side of the surface of the first insulating member 2 facing the inner side of the cover plate, and the bottom plate 31 is located between two of the transverse protrusions 22; the middle region of the transverse protrusions 22 adjacent to the bottom plate 31 in the length direction is provided with a positioning part 23 extending toward the bottom plate 31, the bottom plate 31 is provided with a positioning groove 311, the positioning part 23 abuts against the positioning groove 311, and the wide side of the bottom plate 31 is spaced apart from the transverse protrusions 22 adjacent to the bottom plate 31.

[0038] The cover plate of this structure has a positioning part 23 in the middle region of the transverse protrusion 22 along its length. The positioning parts 23 on both sides of the base plate 31 of the electrode post 3 abut against the positioning groove 311 to limit the width of the base plate 31. At the same time, the positioning part 23 extends a certain distance toward the base plate 31, so that the width of the base plate 31 is separated from the transverse protrusion 22, increasing the distance between the transverse protrusion 22 and the width of the base plate 31. This facilitates the electrolyte to flow out from the large gap between the two, preventing the electrolyte from accumulating between the base plate 31 and the transverse protrusion 22. This prevents the electrolyte from reacting chemically with the electrode to produce particulate matter, avoids the increase of particulate matter, and ensures the performance of the battery cell by maintaining the conductivity between the electrode post 3 and the cover plate body 1.

[0039] In some alternative embodiments, such as Figure 2 As shown, the distance between the base plate 31 and the transverse protrusion 22 is D, where 1mm ≤ D ≤ 10mm. D ≥ 1mm prevents electrolyte buildup due to insufficient distance between the base plate 31 and the transverse protrusion 22. D ≤ 10mm prevents excessive length of the positioning part 23 from affecting its strength. Limiting the upper limit of the positioning part 23's length ensures its strength, thereby guaranteeing its positioning effect on the base plate 31 of the pole post 3.

[0040] In some embodiments, such as Figure 2 and Figure 3 As shown, the base plate 31 is rectangular, with its length greater than its width. The long side of the base plate 31 extends in the same direction as the long side of the first insulating member 2. The positioning groove 311 is recessed from the wide side of the base plate 31 toward the middle area of ​​the base plate 31. The end face of the positioning part 23 facing the base plate 31 is arc-shaped, and the positioning groove 311 is an arc-shaped groove. During cell assembly, the base plate 31 of the electrode post 3 needs to be welded to the electrode tab. During welding, the base plate 31 is prone to expansion and deformation due to heat. Compared with the rectangular groove, the arc-shaped groove can improve the ability of the base plate 31 to absorb thermal expansion and deformation.

[0041] Optionally, in some embodiments, the end face of the positioning part 23 facing the base plate 31 is an arc surface with a diameter d of 1.5mm ≤ d ≤ 5mm; the positioning groove 311 is an arc groove. The arc surface of the positioning part 23 facing the base plate 31 and the corresponding arc groove 311 further enhance the base plate 31's ability to absorb thermal expansion and deformation. D ≥ 1.5mm ensures the minimum diameter of the end of the positioning part 23, thus guaranteeing its strength and positioning effect on the base plate 31. d ≤ 5mm prevents the diameter of the end of the positioning part 23 from being too large. Since the first insulating member 2 is generally made of plastic, if the diameter of the end of the positioning part 23 is too large, the plastic positioning part 23 is prone to deformation, which will affect its fitting accuracy with the base plate 31 and the positioning effect of the positioning part 23 on the base plate 31. d≤5mm, which can ensure the positioning effect of the positioning part 23 on the base plate 31, and at the same time prevent the positioning groove 311 that cooperates with the positioning part 23 from having too large an opening, thus affecting the strength of the base plate 31.

[0042] like Figure 3 As shown, the transverse protrusion 22 is strip-shaped, and its long side extends along the width direction of the first insulating member 2. The positioning portion 23 in the region between the end of the positioning portion 23 and the transverse protrusion 22 is also strip-shaped.

[0043] like Figure 3As shown, in some embodiments, the side surface of the positioning part 23 facing the inside of the cover plate does not exceed the side surface of the base plate 31 facing the inside of the cover plate. This can avoid affecting the welding of the base plate 31 and the electrode tab, and facilitate the welding of the base plate 31 and the electrode tab.

[0044] like Figures 5 to 7 As shown, in some embodiments, the column portion 32 and the base plate 31 are separately disposed. The base plate 31 has a mounting groove 312 on the side facing the column portion 32; the column portion 32 has a mounting plate 321 on the side facing the base plate 31, the mounting plate 321 being embedded in the mounting groove 312 and welded to the base plate 31. The separate disposal of the column portion 32 and the base plate 31 facilitates the selection of base plates 31 with different areas according to the welding area requirements of different base plates 31 and electrode tabs, improving the interchangeability and replaceability of the base plate 31 of the electrode post 3. Simultaneously, the separate disposal of the column portion 32 and the base plate 31 allows for separate processing. In contrast, in the prior art, when the column portion 32 and the base plate 31 are integrally disposed, a large piece of material needs to be milled to form the electrode post 3. Because the cross-sectional area of ​​the column portion 32 is small and the cross-sectional area of ​​the base plate 31 is large, the cross-sectional area of ​​the column portion 32 and the base plate 31 differs significantly, requiring the removal of a considerable amount of material to form the column portion 32, resulting in significant material waste. The base plate 31 and column part 32 of the pole post 3 in this structure are set separately so that the two can be processed separately. The base plate 31 is formed by processing plate material and the column part 32 is formed by processing column material. Then the base plate 31 and the column part 32 are put together to form the pole post 3 of the whole structure. This can save materials and reduce material costs.

[0045] like Figure 5 and Figure 6 As shown, in some embodiments, the mounting plate 321 has a positioning protrusion 322 on the side facing the base plate 31, and the base plate 31 has a positioning hole 313. The positioning protrusion 322 is inserted into the positioning hole 313. This arrangement can improve the positioning and fitting effect between the column part 32 and the base plate 31. After the two are assembled, the positioning protrusion 322 and the base plate 31 are welded from the side surface of the base plate 31 facing the inner side of the cover plate, which can ensure the connection strength between the column part 32 and the base plate 31.

[0046] like Figure 7 As shown, the mounting groove 312 is provided on the side surface of the base plate 31 facing the outside of the cover plate. The shape of the mounting groove 312 is adapted to the shape of the mounting plate 321. The positioning hole 313 is provided on the inner side of the mounting groove 312 and extends through the thickness of the base plate 31.

[0047] like Figure 5As shown, in some embodiments, along the thickness direction of the cover plate, the thickness of the base plate 31 is H, and the thickness of the positioning protrusion 322 is H1, where 1 / 3 ≤ H1 / H ≤ 2 / 3. After the mounting plate 321 and the positioning protrusion 322 are installed, the surface of the mounting plate 321 facing the outer side of the cover plate is flush with the surface of the base plate 31 facing the outer side of the cover plate, and the surface of the positioning protrusion 322 facing the inner side of the cover plate is flush with the surface of the base plate 31 facing the inner side of the cover plate. That is, the total thickness of the mounting plate 321 and the positioning protrusion 322 is equal to the thickness of the base plate 31. H1 / H ≥ 1 / 3, which ensures the lower limit of the thickness of the positioning protrusion 322, thus ensuring the overall strength of the pole post 3 after assembly and welding; at the same time, H1 / H ≤ 2 / 3, which prevents the thickness of the positioning protrusion 322 from being too large, resulting in the thickness of the mounting plate 321 being too small, thereby ensuring the thickness of the mounting plate 321 and thus ensuring the overall strength of the pole post 3 after assembly.

[0048] like Figure 6 As shown, in some embodiments, the cross-sections of the mounting plate 321 and the positioning protrusion 322 are both strip-shaped, with their respective lengths greater than their respective widths. The long sides of the mounting plate 321 and the positioning protrusion 322 extend along the length direction of the first insulating member 2. The length of the mounting plate 321 is L, and the length of the positioning protrusion 322 is L1, where 2 / 5 ≤ L1 / L ≤ 4 / 5. The lengths of both the mounting plate 321 and the positioning protrusion 322 affect the connection strength between the column portion 32 and the base plate 31, as well as the overall strength of the pole post 3. L1 / L ≥ 2 / 5 ensures the length of the positioning protrusion 322, which in turn ensures the welding area between the positioning protrusion 322 and the base plate 31, thereby ensuring the overall strength of the pole post 3 after welding. L1 / L ≤ 4 / 5 prevents the positioning protrusion 322 from being too long, which would result in an excessively long positioning hole 313, and prevents the base plate 31 from having an excessively long opening that would affect its own strength, thus ensuring the strength of the pole post 3 after assembly and welding.

[0049] In some embodiments, such as Figure 7 As shown, the cross-section of the column part 32 is elliptical or racetrack-shaped. The racetrack shape means that the middle region of the cross-section of the column part 32 is rectangular and the two ends of the middle region are semicircular.

[0050] In some embodiments, such as Figures 5 to 7 As shown, the cover plate also includes a riveting block 4, a second insulating member 5, and a sealing member 6. The second insulating member 5 is disposed on the side surface of the cover plate body 1 facing the outside of the cover plate; the riveting block 4 is disposed on the side surface of the second insulating member 5 facing the outside of the cover plate; the sealing member 6 is disposed between the cover plate body 1 and the pole post 3; the side surface of the bottom plate 31 facing the outside of the cover plate abuts against the sealing member 6; the pole part 32 passes through the first insulating member 2, the cover plate body 1, the second insulating member 5, and the riveting block 4 and is riveted to the riveting block 4.

[0051] According to an embodiment of the present invention, another aspect provides a battery cell, including a housing and a cover plate of any of the above embodiments, wherein the housing has an opening and the cover plate is disposed on the opening.

[0052] In this battery cell structure, the cover plate has a positioning part 23 in the middle region of the transverse protrusion 22 along its length. The positioning parts 23 on both sides of the base plate 31 along its length abut against the positioning groove 311 to limit the width of the base plate 31. At the same time, the positioning parts 23 extend a certain distance toward the base plate 31, so that the width of the base plate 31 is separated from the transverse protrusion 22, increasing the distance between the transverse protrusion 22 and the width of the base plate 31. The electrolyte can flow out from the large gap between the two, which can prevent the electrolyte from accumulating between the base plate 31 and the transverse protrusion 22. This can prevent the electrolyte from reacting chemically with the electrode to produce particulate matter, avoid the increase of particulate matter, and ensure the performance of the battery cell.

[0053] In some optional embodiments, the battery cell includes a blade battery cell, which includes a housing with openings at both ends along its length and a cover plate placed vertically. The cover plate includes a positive cover plate and a negative cover plate, with a positive electrode post 3 disposed on the positive cover plate and a negative electrode post 3 disposed on the negative cover plate. The positive and negative cover plates are respectively disposed on the openings at both ends of the housing.

[0054] According to an embodiment of the present invention, in another aspect, a battery pack is provided, comprising the battery cells of the above embodiments.

[0055] In this battery pack structure, the positioning part 23 extends a certain distance toward the base plate 31, increasing the distance between the lateral protrusion 22 and the wide side of the base plate 31. The electrolyte can flow out from the large gap between the two, preventing the electrolyte from accumulating between the base plate 31 and the lateral protrusion 22. This prevents the electrolyte from reacting chemically with the electrode to produce particulate matter, avoids the increase of particulate matter, and ensures the performance of the cell and battery pack.

[0056] 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, characterized in that, include: Cover plate body; A first insulating member is disposed on the inner side of one side surface of the cover plate body facing the inner side of the cover plate; the first insulating member is provided with two edge protrusions and at least two transverse protrusions on one side surface facing the inner side of the cover plate, the two edge protrusions are disposed on both sides of the width direction of the first insulating member, and the at least two transverse protrusions extend along the width direction of the first insulating member and are spaced apart between the two edge protrusions along the length direction of the first insulating member. The pole includes a base plate and a column portion disposed on the base plate, the column portion passing through the first insulating member and the cover plate body; the base plate is located inside the surface of the first insulating member facing the inner side of the cover plate, and the base plate is located between two of the transverse protrusions; the middle region of the transverse protrusions adjacent to the base plate in the length direction is provided with a positioning portion extending toward the base plate, the base plate is provided with a positioning groove, the positioning portion abuts against the positioning groove, and the wide side of the base plate is spaced apart from the transverse protrusions adjacent to the base plate.

2. The cover plate according to claim 1, characterized in that, The distance between the base plate and the transverse protrusion is D, where 1mm ≤ D ≤ 10mm.

3. The cover plate according to claim 1 or 2, characterized in that, The end face of the positioning part facing the base plate is arc-shaped, and the positioning groove is an arc-shaped groove.

4. The cover plate according to claim 3, characterized in that, The end face of the positioning part facing the base plate is an arc surface with a diameter of d, where 1.5mm ≤ d ≤ 5.5mm; the positioning groove is an arc groove.

5. The cover plate according to claim 1 or 2, characterized in that, The column portion and the base plate are separately provided. The base plate has a mounting groove on the side facing the column portion. The column portion has a mounting plate on the side facing the base plate. The mounting plate is embedded in the mounting groove and is welded to the base plate.

6. The cover plate according to claim 5, characterized in that, The mounting plate has a positioning protrusion on the side facing the base plate, and the base plate has a positioning hole, with the positioning protrusion inserted into the positioning hole.

7. The cover plate according to claim 6, characterized in that, Along the thickness direction of the cover plate, the thickness of the bottom plate is H, and the thickness of the positioning protrusion is H1, where 1 / 3 ≤ H1 / H ≤ 2 / 3.

8. The cover plate according to claim 6, characterized in that, The long sides of the mounting plate and the positioning protrusion extend along the length direction of the first insulating member. The length of the mounting plate is L, and the length of the positioning protrusion is L1, where 2 / 5 ≤ L1 / L ≤ 4 / 5.

9. A battery cell, characterized in that, It includes a housing and a cover plate according to any one of claims 1 to 8, wherein the housing has an opening and the cover plate is disposed on the opening.

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

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