Cover plate, cover plate assembly, electric core and energy storage device

Abstract

The utility model discloses a kind of cover plate, cover plate assembly, electric core and energy storage device, including first connecting plate, connecting wall and second connecting plate;First connecting plate, connecting wall and second connecting plate are annular structure;Connecting wall is connected between the radial outer end of first connecting plate and the radial inner end of second connecting plate;First connecting plate and second connecting plate have height difference between;Second connecting plate and for connecting the shell of electric core;In the direction of first connecting plate to second connecting plate, the inner diameter of connecting wall gradually increases.When the shell of second plate connecting electric core, the accommodating hole of connecting wall can be used to accommodate pole, so that the pole can be effectively avoided to extend into the accommodating cavity of shell, or the size of pole extending into accommodating cavity is reduced, and then the pole can be avoided to extrude the pole core in accommodating cavity, and the self-discharge problem caused by the damage of pole piece end face caused by the interference of original pole core and the problem of insufficient liquid retention can be effectively improved.

Description

Technical Field

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

[0002] In the current conventional structure of steel-cased button cell, the flange edge or boss of the electrode post on the cover plate will sink into the receiving cavity of the steel shell. When the cover plate and steel shell are closed, the electrode post that has sunk into the receiving cavity of the steel shell will interfere with the electrode core in the receiving cavity, squeeze the edge of the electrode core, cause damage and powder shedding on the electrode end face of the electrode core, and affect the charging and discharging performance of the cell. Utility Model Content

[0003] This utility model provides a cover plate, a cover plate assembly, a battery cell, and an energy storage device, aiming to solve the problem that the electrode post in existing battery cells is prone to squeezing the electrode core.

[0004] This utility model embodiment provides a cover plate, including a first connecting plate, a connecting wall, and a second connecting plate; the first connecting plate, the connecting wall, and the second connecting plate are all annular structures; the connecting wall is connected between the outer radial end of the first connecting plate and the inner radial end of the second connecting plate; there is a height difference between the first connecting plate and the second connecting plate; the second connecting plate is also used to connect the housing of the battery cell; wherein, the first connecting plate forms a first inner hole around the connecting wall, the second connecting plate forms a second inner hole around the connecting wall, and the connecting wall forms a receiving hole around the connecting wall, the first inner hole and the receiving hole are in communication; the second connecting plate is surrounding the connecting wall outside the connecting wall, and the inner diameter of the receiving hole gradually increases along the direction from the first connecting plate to the second connecting plate; or, the second connecting plate is connected to the end of the connecting wall away from the first connecting plate, the second inner hole and the receiving hole are in communication to form a receiving cavity, and the inner diameter of the receiving cavity gradually increases along the direction from the first connecting plate to the second connecting plate.

[0005] Optionally, along the axial direction of the connecting wall, the height difference between the end of the connecting wall near the first connecting plate and the second connecting plate is D, where 0.15mm ≤ D ≤ 0.25mm; and / or, the inner diameter of the first connecting plate is I, where 2mm ≤ I ≤ 5mm; and / or, the width of the second connecting plate is L, where 0.8mm ≤ L ≤ 2mm; and / or, the thickness of the second connecting plate is H, where 0.12mm ≤ H ≤ 0.2mm; and / or, the angle between the connecting wall and the first connecting plate is α, where α ≥ 110 degrees; and / or, the angle between the connecting wall and the second connecting plate is β, where β ≥ 110 degrees.

[0006] Optionally, the first connecting plate is a flat plate; the second connecting plate is also a flat plate; the inner diameter of the second connecting plate is larger than the outer diameter of the first connecting plate; the first connecting plate, the connecting wall, and the second connecting plate are coaxial; and / or, the end of the connecting wall opposite to the first connecting plate is flush with the end of the second connecting plate opposite to the first connecting plate, and the end of the connecting wall opposite to the second connecting plate is flush with the end of the first connecting plate opposite to the second connecting plate.

[0007] Optionally, the first connecting plate, the connecting wall, and the second connecting plate are an integral structure; the cover plate is a stamped part.

[0008] This utility model embodiment also provides a cover plate assembly, including a pole, an insulating member, and a cover plate as described in any one of the above; the pole is connected to the first connecting plate and is opposite to the inner hole of the first connecting plate; the insulating member is disposed between the pole and the first connecting plate to electrically isolate the pole and the first connecting plate; the connecting wall surrounds and is spaced apart from the pole.

[0009] Optionally, the pole post does not protrude from the connecting wall along the direction from the first connecting plate to the second connecting plate; and / or, the pole post does not protrude from the first connecting plate along the direction from the second connecting plate to the first connecting plate.

[0010] Optionally, in the radial direction of the connecting wall, the difference between the maximum diameter of the pole post and the minimum inner diameter of the connecting wall is A, where 0.5mm≤A≤1.5mm.

[0011] Optionally, the pole post includes a connected cylindrical portion and an annular portion, the annular portion surrounding the cylindrical portion; the cylindrical portion is opposite to the inner hole of the first connecting plate; the annular portion is connected to the first connecting plate via the insulating member; in the radial direction of the connecting wall, the insulating member protrudes from the annular portion toward the connecting wall.

[0012] This utility model embodiment also provides a battery cell, including a housing, an electrode core, and a cover plate assembly as described in any one of the above; the housing has a receiving cavity with an opening at one end; the cover plate assembly is connected to the opening end of the housing and closes the opening of the receiving cavity; the electrode core is located in the receiving cavity; a first electrode tab of the electrode core is electrically connected to the housing, and a second electrode tab of the electrode core is electrically connected to the terminal post; one of the first electrode tab and the second electrode tab is a positive electrode tab, and the other is a negative electrode tab.

[0013] This utility model embodiment also provides an energy storage device, including the battery cell described above.

[0014] In the cover plate, cover plate assembly, battery cell, and energy storage device provided in this utility model embodiment, when the second plate is connected to the battery cell housing, the receiving holes of the connecting wall can be used to receive the electrode post, thereby effectively preventing the electrode post from extending into the housing cavity, or reducing the size of the electrode post extending into the receiving cavity, thereby preventing the electrode post from squeezing the electrode core in the receiving cavity, and effectively improving the self-discharge problem and insufficient liquid retention problem caused by the electrode core being interfered with in the original battery cell due to damage to the electrode end face.

[0015] Meanwhile, in this embodiment, the inner end of the second connecting plate is connected to the connecting wall, which is equivalent to a flange structure set on the outer side of the connecting wall. Compared with the method of the connecting wall directly connecting to the shell, even if the wall thickness of the connecting wall is small, the cover plate and the shell can have a better connection effect.

[0016] In addition, by gradually increasing the inner diameter of the connecting wall along the direction from the first connecting plate to the second connecting plate, it is easier to insert the pole into the receiving hole of the connecting wall from the side of the second connecting plate away from the first connecting plate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the cover plate provided in one embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of a cover plate assembly provided in one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a battery cell provided in one embodiment of the present invention; Figure 4 This is a schematic diagram of the cover plate provided in another embodiment of the present invention.

[0019] Instruction manual drawing reference numerals: 100. Battery cell; 10. Cover plate assembly; 20. Housing; 30. Electrode core; 1. Cover plate; 11. First connecting plate; 11. First inner hole; 12. Connecting wall; 121. Receiving hole; 13. Second connecting plate; 131. Second inner hole; 14. Mounting hole; 2. Pole post; 21. Column part; 22. Annular part; 3. Insulating components; 4. Receiving cavity. Detailed Implementation

[0020] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] In the description of this utility model, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0023] like Figures 1 to 3 As shown, in one embodiment, the cover plate 1 includes a first connecting plate 11, a connecting wall 12, and a second connecting plate 13; the first connecting plate 11, the connecting wall 12, and the second connecting plate 13 are all annular structures; the connecting wall 12 connects between the outer radial end of the first connecting plate 11 and the inner radial end of the second connecting plate 13; there is a height difference between the first connecting plate 11 and the second connecting plate 13; the second connecting plate 13 is also used to connect the housing 20 of the battery cell 100; the first connecting plate 11 forms a first inner hole 111 around the perimeter, and the connecting wall 12 forms a receiving hole 121 around the perimeter, the first inner hole 111 and the receiving hole 121 are connected; the second connecting plate 13 surrounds the connecting wall 12, and the diameter of the receiving hole 121 gradually increases along the direction from the first connecting plate 11 to the second connecting plate 13.

[0024] In the prior art, the cover plate 1 is usually a flat plate, and the side of it close to the housing 20 of the cell 100 is flat and does not have space to accommodate the electrode post 2. Therefore, a large part of the electrode post 2 will extend into the receiving cavity 4 of the housing 20, which will easily squeeze the electrode core 30 in the receiving cavity 4.

[0025] In this embodiment, when the second plate is connected to the housing 20 of the cell 100, the receiving holes 121 of the connecting wall 12 can be used to receive the electrode post 2, thereby effectively preventing the electrode post 2 from extending into the receiving cavity 4 of the housing 20, or reducing the size of the electrode post 2 extending into the receiving cavity 4, thereby preventing the electrode post 2 from squeezing the electrode core 30 in the receiving cavity 4, which can effectively improve the self-discharge problem and insufficient liquid retention problem caused by the electrode end face damage due to interference of the electrode core 30 in the original cell 100.

[0026] Meanwhile, in this embodiment, the inner end of the second connecting plate 13 is connected to the connecting wall 12, which is equivalent to a flange structure set on the outer side of the connecting wall 12. Compared with the way that the connecting wall 12 is directly connected to the shell 20, even if the wall thickness of the connecting wall 12 is small, the cover plate 1 and the shell 20 can have a better connection effect.

[0027] In addition, by gradually increasing the inner diameter of the connecting wall 12 along the direction from the first connecting plate 11 to the second connecting plate 13, it is easier for the pole post 2 to be inserted into the receiving hole 121 of the connecting wall 12 from the side of the second connecting plate 13 away from the first connecting plate 11.

[0028] It should be noted that the inner diameter of the connecting wall 12 is the same as the diameter of the receiving hole 121, and the receiving hole 121 can be a tapered hole.

[0029] In the actual product, the diameter of the first inner hole 111 is smaller than the minimum diameter of the receiving hole 121. The pole post 2 can be located inside the receiving hole 121 and connected to the first connecting plate 11. Moreover, the pole post 2 is insulated from the cover plate 1.

[0030] In one embodiment, the pole post 2 can be bonded to the surface of the first connecting plate 11 near the second connecting plate 13 by means of insulating adhesive, and the pole post 2 is spaced apart from the connecting wall 12.

[0031] In one embodiment, the first connecting plate 11, the connecting wall 12, and the second connecting plate 13 can be an integral structure. For example, the cover plate 1 is a stamped part, which can be obtained by stamping a flat plate during production.

[0032] In one embodiment, the first connecting plate 11 is a flat plate; the second connecting plate 13 is also a flat plate; the inner diameter of the second connecting plate 13 is larger than the outer diameter of the first connecting plate 11; the first connecting plate 11, the connecting wall 12, and the second connecting plate 13 are coaxial.

[0033] After assembly, the first connecting plate 11 and the second connecting plate 13 can be parallel.

[0034] The connecting wall 12 is connected to the outer end of the first connecting plate 11, and can be regarded as the connecting wall 12 being sleeved on the outer side of the first connecting plate 11; The connecting wall 12 is connected to the inner end of the second connecting plate 13, which can be regarded as the second connecting plate 13 being sleeved on the outer side of the connecting wall 12.

[0035] The height difference between the first connecting plate 11 and the second connecting plate 13 means that there is a height difference between the first connecting plate 11 and the second connecting plate 13 in the axial direction of the connecting wall 12.

[0036] The axial direction of the connecting wall 12 is parallel to the Z-axis.

[0037] In addition, the end of the connecting wall 12 facing away from the first connecting plate 11 is flush with the end of the second connecting plate 13 facing away from the first connecting plate 11, and the end of the connecting wall 12 facing away from the second connecting plate 13 is flush with the end of the first connecting plate 11 facing away from the second connecting plate 13. This facilitates the production and use of the cover plate 1.

[0038] like Figure 1 As shown, in one embodiment, a first connecting plate 11 is formed with an inner hole (defined as the first inner hole 111) around its perimeter. The first inner hole 111 penetrates the first connecting plate 11 in the thickness direction, and the inner diameter of the first connecting plate 11 is the diameter of the first inner hole 111. During production, this is equivalent to setting the first inner hole 111 penetrating the thickness direction on a flat plate, thereby forming an annular first connecting plate 11.

[0039] The first inner hole 111 can be a circular hole.

[0040] In one embodiment, a second connecting plate 13 is formed with an inner hole (defined as the second inner hole) around its perimeter. The second inner hole penetrates the second connecting plate 13 in the thickness direction, and the inner diameter of the second connecting plate 13 is the diameter of the second inner hole. In production, this is equivalent to setting a second inner hole penetrating the thickness direction on a flat plate, thereby forming an annular second connecting plate 13.

[0041] The second inner hole can be a circular hole.

[0042] In addition, the thickness direction of the first connecting plate 11 is parallel to the thickness direction of the second connecting plate 13, and both are parallel to the axial direction of the connecting wall 12.

[0043] In addition, the first inner hole 111, the second inner hole, and the receiving hole 121 can be coaxial.

[0044] like Figure 1 As shown, in one embodiment, the height difference between the end of the connecting wall 12 near the first connecting plate 11 and the second connecting plate 13 is D, where 0.15mm ≤ D ≤ 0.25mm. This ensures the cover plate 1 can accommodate the pole post 2 effectively and avoids excessively increasing the thickness of the cover plate 1.

[0045] In practical scenarios, the value of D can be 0.15mm, 0.2mm, or 0.25mm.

[0046] In addition, the thickness of the cover plate 1 is the distance between the surface of the first connecting plate 11 facing away from the second connecting plate 13 and the surface of the second connecting plate 13 facing away from the first connecting plate 11.

[0047] In one embodiment, the inner diameter of the first connecting plate 11 is I, where 2mm ≤ I ≤ 5mm. The inner diameter of the first connecting plate 11 is the same as the diameter of the first inner hole 111. This facilitates the exposure of the pole post 2.

[0048] In practical scenarios, the value of I can be 2mm, 3mm, 4mm or 5mm.

[0049] In one embodiment, the width of the second connecting plate 13 is L, where 0.8mm ≤ L ≤ 2mm. This ensures the connection effect between the second connecting plate 13 and the housing 20 of the battery cell 100, and avoids excessively increasing the lateral dimension (i.e., the radial dimension of the second connecting plate 13) of the cover plate 1.

[0050] In practical scenarios, the value of L can be 0.8mm, 1mm, 1.5mm or 2mm.

[0051] In one embodiment, the thickness of the second connecting plate 13 is H, where 0.12mm ≤ H ≤ 0.2mm. In actual products, the second connecting plate 13 is usually welded to the housing 20, and this arrangement can improve the welding effect.

[0052] In practical scenarios, the value of H can be 0.12mm, 0.18mm, 0.18mm or 0.2mm.

[0053] In one embodiment, the thickness of the first connecting plate 11, the wall thickness of the connecting wall 12, and the thickness of the second connecting plate 13 can be the same. During production, a flat plate with a thickness greater than or equal to 0.12 mm and less than or equal to 0.2 mm can be stamped to obtain the cover plate 1. This thickness setting facilitates the stamping and preparation of the cover plate 1.

[0054] like Figure 1 As shown, in one embodiment, the angle between the connecting wall 12 and the first connecting plate 11 is α, where α ≥ 110 degrees. When the cover plate 1 is a stamped part, this can prevent the bending angle between the connecting wall 12 and the first connecting plate 11 from being too large, thus reducing the strength of the area where they meet.

[0055] like Figure 1As shown, in one embodiment, the included angle between the connecting wall 12 and the second connecting plate 13 is β, where β ≥ 110 degrees. When the cover plate 1 is a stamped part, this can prevent the bending angle between the connecting wall 12 and the second connecting plate 13 from being too large, thus reducing the strength of the area where they meet.

[0056] In addition, α is less than 180 degrees and β is less than 180 degrees.

[0057] like Figure 2 As shown, this utility model embodiment also provides a cover plate assembly 10, which includes a pole post 2, an insulating member 3, and a cover plate 1 of any one of the above; the pole post 2 is connected to a first connecting plate 11 and is opposite to the inner hole (i.e., the first inner hole 111) of the first connecting plate 11; the insulating member 3 is disposed between the pole post 2 and the first connecting plate 11 to electrically isolate the pole post 2 and the first connecting plate 11; the connecting wall 12 surrounds and is spaced apart from the pole post 2.

[0058] In this embodiment, a portion of the electrode post 2 is located within the receiving hole 121 of the connecting wall 12, thereby reducing its encroachment on the receiving cavity 4 of the housing 20 of the battery cell 100 and avoiding its adverse effects on the electrode core 30 within the receiving cavity 4.

[0059] The term "connecting wall 12 surrounds and is spaced apart from pole post 2" means that the connecting wall 12 surrounds the outside of pole post 2 and the two are spaced apart.

[0060] The pole post 2 is opposite to the first inner hole 111. This can mean that in an orthographic projection on a plane perpendicular to the axis of the first inner hole 111, the projection of the first inner hole 111 and the projection of the pole post 2 have an overlapping area.

[0061] In some scenarios, the pole post 2 can extend into the first inner hole 111, thereby achieving a relationship with the first inner hole 111.

[0062] like Figure 2 As shown, in one embodiment, the pole post 2 does not protrude from the connecting wall 12 along the direction from the first connecting plate 11 to the second connecting plate 13. This can more effectively prevent the pole post 2 from interfering with the pole core 30 in the receiving cavity 4.

[0063] like Figure 2 As shown, in one embodiment, the pole post 2 does not protrude from the first connecting plate 11 along the direction from the second connecting plate 13 to the first connecting plate 11.

[0064] This reduces the size of the cover plate assembly 10, which is beneficial for providing the energy density of the battery cell 100 when it is used to manufacture the battery cell 100.

[0065] In one embodiment, the difference between the maximum diameter of the pole post 2 and the minimum inner diameter of the connecting wall 12 in the radial direction is A, where 0.5mm ≤ A ≤ 1.5mm. This ensures the insulation performance between the pole post 2 and the connecting wall 12.

[0066] In practical scenarios, the value of A can be 0.5mm, 1mm, or 1.5mm.

[0067] like Figure 2 As shown, in one embodiment, the pole post 2 includes a column portion 21 and an annular portion 22 connected to each other, the annular portion 22 surrounding the column portion 21; the column portion 21 is opposite to the inner hole of the first connecting plate 11; the annular portion 22 is connected to the first connecting plate 11 by an insulating member 3; in the radial direction of the connecting wall 12, the insulating member 3 protrudes toward the connecting wall 12 from the annular portion 22.

[0068] In the direction from the annular portion 22 to the first connecting plate 11 (that is, from the second connecting plate 13 to the first connecting plate 11), the column portion 21 protrudes from the annular portion 22, and the section of the column portion 21 that protrudes from the annular portion 22 (defined as the protruding structure) is opposite to the first inner hole 111, so as to realize that the pole post 2 is opposite to the first inner hole 111.

[0069] In one scenario, the protruding structure can extend into the first inner hole 111. At this time, the protruding structure and the hole wall of the first inner hole 111 are spaced apart, wherein the insulating member 3 fills the gap between the protruding structure and the hole wall of the first inner hole 111.

[0070] In addition, in the radial direction of the connecting wall 12, the insulating member 3 protrudes into the annular portion 22 towards the connecting wall 12, which can improve the insulation effect between the annular portion 22 and the first connecting plate 11.

[0071] In addition, the insulating component 3 can be a structure formed after the insulating adhesive has been cured, and the insulating adhesive can be PP adhesive, etc.

[0072] The maximum diameter of the pole post 2 mentioned above actually refers to the outer diameter of the annular portion 22.

[0073] In one embodiment, the annular portion 22 is a circular ring structure with a thickness of B, wherein 0.1 mm ≤ B ≤ 0.18 mm.

[0074] In real-world scenarios, the value of B can be 0.1mm, 0.18mm, or 0.18mm.

[0075] like Figure 3As shown, this utility model embodiment also provides a battery cell 100, including a housing 20, an electrode core 30, and a cover plate assembly 10 as described in any of the above embodiments; the housing 20 has a receiving cavity 4 with one end open; the cover plate assembly 10 is connected to the open end of the housing 20 and closes the opening of the receiving cavity 4; the electrode core 30 is located in the receiving cavity 4; the first electrode tab of the electrode core 30 is electrically connected to the housing 20, and the second electrode tab of the electrode core 30 is electrically connected to the electrode post 2; one of the first electrode tab and the second electrode tab is a positive electrode tab, and the other is a negative electrode tab.

[0076] The end face of the opening of the receiving cavity 4 can be its upper end face, and the surface of the second connecting plate 13 facing away from the first connecting plate 11 is connected to the upper end face.

[0077] In addition, the shell 20 can be a cylindrical shell, and the receiving cavity 4 can be a circular hole.

[0078] In addition, the outer diameter of the second connecting plate 13 can be equal to the outer diameter of the housing 20.

[0079] In practical scenarios, apart from the tabs connecting the pole post 2, the other parts of the pole core 30 may not protrude upwards from the housing 20.

[0080] This utility model embodiment also provides an energy storage device, which includes the battery cell 100 described in any of the above-described embodiments.

[0081] The energy storage device can be a Bluetooth headset, a car, or an aircraft, etc. When in use, the battery cell 100 can store electrical energy to power other devices.

[0082] It should be understood that the above-mentioned settings can also be replaced in other ways, such as: like Figure 4 As shown, in other embodiments, the connecting wall 12 is connected to the inner end of the second connecting plate 13. Alternatively, the connecting wall 12 can be connected to the surface of the second connecting plate 13 near the first connecting plate 11, and the connecting area of ​​the connecting wall 12 on the second connecting plate 13 is close to the second inner hole 131.

[0083] In this embodiment, the second connecting plate 13 is connected to the end of the connecting wall 12 opposite to the first connecting plate 11. The second inner hole 131 and the receiving hole 121 communicate to form a mounting hole 14. The diameter of the mounting hole 14 gradually increases along the direction from the first connecting plate 11 to the second connecting plate 13. In use, the mounting hole 14 is used to accommodate the pole post 2.

[0084] In addition, in this embodiment, the first inner hole 111, the second inner hole 131, and the receiving hole 121 are connected.

[0085] like Figure 4As shown, in other embodiments, the connecting wall 12 is connected to the outer end of the first connecting plate 11. Alternatively, the first connecting plate 11 can be connected to one end face of the connecting wall 12, and the area of ​​the first connecting wall 12 used to connect the connecting wall 12 is close to the outer edge of the first connecting plate 11.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A cover plate, characterized in that, Includes a first connecting plate, a connecting wall, and a second connecting plate; The first connecting plate, the connecting wall, and the second connecting plate are all annular structures; The connecting wall is connected between the outer radial end of the first connecting plate and the inner radial end of the second connecting plate; There is a height difference between the first connecting plate and the second connecting plate; The second connecting plate is also used to connect the housing of the battery cell; Wherein, the first connecting plate surrounds to form a first inner hole, the second connecting plate surrounds to form a second inner hole, the connecting wall surrounds to form a receiving hole, and the first inner hole and the receiving hole are connected; The second connecting plate surrounds the connecting wall, and the diameter of the receiving hole gradually increases along the direction from the first connecting plate to the second connecting plate; or, the second connecting plate is connected to the end of the connecting wall away from the first connecting plate, the second inner hole and the receiving hole communicate to form a receiving cavity, and the diameter of the mounting hole gradually increases along the direction from the first connecting plate to the second connecting plate.

2. The cover plate according to claim 1, characterized in that, Along the axial direction of the connecting wall, the height difference between the end of the connecting wall near the first connecting plate and the second connecting plate is D, where 0.15mm ≤ D ≤ 0.25mm; and / or, The inner diameter of the first connecting plate is I, where 2mm ≤ I ≤ 5mm; and / or, The width of the second connecting plate is L, where 0.8mm ≤ L ≤ 2mm; and / or, The thickness of the second connecting plate is H, where 0.12mm ≤ H ≤ 0.2mm; and / or, The angle between the connecting wall and the first connecting plate is α, where α ≥ 110 degrees; and / or, The angle between the connecting wall and the second connecting plate is β, where β ≥ 110 degrees.

3. The cover plate according to claim 1, characterized in that, The first connecting plate is a flat plate; both the second connecting plates are flat plates; the inner diameter of the second connecting plate is larger than the outer diameter of the first connecting plate; the first connecting plate, the connecting wall, and the second connecting plate are coaxial; and / or, The end of the connecting wall opposite to the first connecting plate is flush with the end of the second connecting plate opposite to the first connecting plate, and the end of the connecting wall opposite to the second connecting plate is flush with the end of the first connecting plate opposite to the second connecting plate.

4. The cover plate according to claim 1, characterized in that, The first connecting plate, the connecting wall, and the second connecting plate are an integral structure; the cover plate is a stamped part.

5. A cover plate assembly, characterized in that, Includes poles, insulating components, and the cover plate as described in any one of claims 1 to 4; The pole is connected to the first connecting plate and is opposite to the inner hole of the first connecting plate; The insulating element is disposed between the electrode post and the first connecting plate to electrically isolate the electrode post and the first connecting plate; The connecting wall surrounds and is spaced apart from the pole post.

6. The cover plate assembly according to claim 5, characterized in that, Along the direction from the first connecting plate to the second connecting plate, the pole does not protrude from the connecting wall; and / or, Along the direction from the second connecting plate to the first connecting plate, the pole does not protrude from the first connecting plate.

7. The cover plate assembly according to claim 5, characterized in that, In the radial direction of the connecting wall, the difference between the maximum diameter of the pole and the minimum inner diameter of the connecting wall is A, where 0.5mm≤A≤1.5mm.

8. The cover plate assembly according to claim 5, characterized in that, The pole post includes a connected cylindrical portion and an annular portion, the annular portion surrounding the cylindrical portion; The cylindrical portion is opposite to the inner hole of the first connecting plate; The annular portion is connected to the first connecting plate via the insulating component; In the radial direction of the connecting wall, the insulating element protrudes from the annular portion toward the connecting wall.

9. A battery cell, characterized in that, Includes a housing, an electrode core, and a cover plate assembly as described in any one of claims 5 to 8; The housing has a receiving cavity that is open at one end; The cover plate assembly is connected to the open end of the housing and closes the opening of the receiving cavity; The electrode core is located within the receiving cavity; The first tab of the electrode core is electrically connected to the housing, and the second tab of the electrode core is electrically connected to the electrode post; One of the first electrode tab and the second electrode tab is a positive electrode tab, and the other is a negative electrode tab.

10. An energy storage device, characterized in that, Includes the battery cell described in claim 9.

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