Battery cell cover plate, battery cell, battery and power utilization device

Abstract

The utility model relates to a battery cell cover plate, a battery cell, a battery and a power utilization device, the battery cell cover plate comprises a cover body and a first convex rib, the cover body comprises a first surface and a second surface which are oppositely arranged in the thickness direction of the cover body, and the second surface is configured to be arranged towards the interior of the battery cell. The first convex rib is concavely arranged on the first surface and is convexly arranged relative to the second surface, and a thinning part is arranged on the first convex rib. The thinning part is arranged on the first convex rib to serve as the explosion-proof structure, and the first convex rib protrudes towards the inner side of the battery cell, so that external physical collision or impact cannot directly act on the explosion-proof structure formed by the thinning part, the probability that the explosion-proof structure is damaged and decompressed in advance is further reduced, and the reliability of the battery cell is improved. In addition, the first convex ribs can enhance the strength of the battery cell cover plate.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cover, a battery cell, a battery and an electrical device. Background Art

[0002] At present, lithium-ion batteries usually have weak explosion-proof notches or indentations on the surface of the shell or cover. When the battery abnormally experiences thermal runaway, the explosion-proof notches or indentations are opened to release the pressure in time. The explosion-proof notches or indentations are directly exposed to the environment. When they are subjected to external physical collisions or impacts, they are easily damaged and the pressure is released in advance, reducing the reliability of the battery. Utility Model Content

[0003] Based on this, it is necessary to provide a battery cover, battery cell, battery and electrical device to address the problem that explosion-proof notches or indentations are easily damaged and release pressure in advance, thereby reducing battery reliability.

[0004] In a first aspect, an embodiment of the present application provides a battery cell cover, comprising:

[0005] The cover body includes a first surface and a second surface disposed opposite to each other in a thickness direction thereof, wherein the second surface is configured to be disposed toward the inside of the battery cell;

[0006] The first convex rib is recessed in the first surface and protrudes relative to the second surface. The first convex rib is provided with a thinning portion.

[0007] In some embodiments, the thinned portion is disposed on the concave surface and / or the convex surface of the first rib.

[0008] In some embodiments, in the width direction of the first convex rib, the maximum opening width L1 of the concave surface of the first convex rib and the maximum distance s between the center of the thinning portion and the opening end of the corresponding concave surface in the width direction of the first convex rib satisfy: 0≤s≤L1 / 2.

[0009] In some embodiments, the first convex rib is arranged in a circular ring shape, the thinning portion is extended around the center of the first convex rib, and the center angle θ of the thinning portion satisfies: 180°≤θ≤360°.

[0010] In some embodiments, the wall thickness h of the thinned portion and the wall thickness H of the first rib satisfy: 1%≤h / H≤80%.

[0011] In some embodiments, the battery cell cover plate further includes a protective layer, and the protective layer covers the thinned portion.

[0012] In some embodiments, the cell cover plate further includes a second convex rib, wherein the second convex rib is recessed in the first surface and protrudes relative to the second surface;

[0013] A protruding distance of the second rib relative to the second surface is greater than a protruding distance of the first rib relative to the second surface.

[0014] In some embodiments, the battery cell cover is a circular cover, and the maximum opening width L1 of the recessed surface of the first convex rib, the maximum opening width L2 of the recessed surface of the second convex rib and the diameter R of the battery cell cover satisfy: 5%R≤L1≤50%R, 5%R≤L2≤50%R.

[0015] In some embodiments, the first convex rib is arranged in a circular ring shape, and the second convex rib is arranged on the inner side and / or the outer side of the first convex rib.

[0016] In some embodiments, the battery cell cover further includes a liquid injection port, and the liquid injection port passes through the first surface and the second surface.

[0017] In a second aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly and a battery cell cover as described in the above embodiment, wherein the electrode assembly is accommodated in the shell, and the battery cell cover covers the shell.

[0018] In some embodiments, the battery cell further comprises a current collecting plate and a pole, wherein the pole is located at one end of the housing away from the battery cell cover plate and is electrically connected to one end of the electrode assembly; the current collecting plate is located between the electrode assembly and the battery cell cover plate and is electrically connected to the other end of the electrode assembly;

[0019] The cell cover plate includes a second convex rib, and the cell cover plate is electrically connected to the current collecting plate via the second convex rib.

[0020] In a third aspect, an embodiment of the present application provides a battery, comprising the battery cell as described above.

[0021] In a fourth aspect, an embodiment of the present application provides an electrical device, comprising the battery described above, wherein the battery is used to provide electrical energy.

[0022] The cell cover, cell, battery and electrical device are provided with a thinned portion on the first convex rib as an explosion-proof structure. Since the first convex rib protrudes toward the inner side of the cell, external physical collision or impact cannot directly act on the explosion-proof structure formed by the thinned portion, thereby reducing the probability of premature damage and pressure release of the explosion-proof structure and improving the reliability of the cell. In addition, the first convex rib can also strengthen the strength of the cell cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0024] Figure 1 Schematic diagram of the exploded view of the battery cell of some embodiments.

[0025] Figure 2 It is a front schematic diagram of a battery cell cover plate according to some embodiments.

[0026] Figure 3 for Figure 2 Schematic diagram of the reverse side of the battery cover shown.

[0027] Figure 4 for Figure 2 A partial cross-sectional view of the battery cell cover is shown.

[0028] Figure 5 for Figure 4 An enlarged view of the first rib in the structure shown.

[0029] The reference numerals in the specific implementation manner are as follows:

[0030] 100, battery cell; 10, battery cell cover; 11, cover body; m1, first surface; m2, second surface; 12, first convex rib; 12a, end; 12b, side wall; 13, thinning portion; 14, second convex rib; 15, liquid injection port; 20, shell; 30, electrode assembly; 40, collector plate; 50, pole; 60, sealing nail. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that terms such as “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships, if any, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, if present, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, if any, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In the present application, if it appears, unless otherwise clearly specified and limited, a first feature “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature “above”, “above” and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature “below”, “below” and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that, if present, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0037] In order to solve the problem that explosion-proof notches or indentations are directly exposed to the environment and easily damaged by external physical collisions or impacts, resulting in premature pressure relief of the battery cell and reduced reliability of the battery cell, the embodiments of the present application propose a battery cell cover, a battery cell, a battery and an electrical device.

[0038] The cell cover provided in the embodiment of the present application can be used to prepare a cell. Figure 1 In some embodiments, the battery cell 100 includes a shell 20, a battery cell cover 10 and an electrode assembly 30. The shell 20 cooperates with the battery cell cover 10 to form a storage space, and the electrode assembly 30 is stored in the storage space. The electrode assembly 30 is a unit for electrochemical reaction in the battery cell 100, and usually includes a positive electrode sheet, a negative electrode sheet and a separator. The separator is arranged between the positive electrode sheet and the negative electrode sheet, and plays the role of insulating and isolating the positive electrode sheet and the negative electrode sheet, and can allow ions to pass through itself. The separator can be a diaphragm. The electrode assembly 30 can be a winding type or a stacked type. The battery cell 100 can be a cylindrical battery cell or a square battery cell, etc.

[0039] A battery can be prepared using the battery cell 100 of the embodiment of the present application. Generally, the battery may also include a casing, in which a plurality of battery cells 100 are arranged side by side. The battery in the embodiment of the present application can be applied to an electrical device to provide electrical energy for the electrical device. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, and the like. Taking the electrical device as a vehicle as an example, the battery may be arranged at the rear, front, or bottom of the vehicle, and the battery may provide electrical energy for the drive of the vehicle, and may also provide electrical energy for the control system of the vehicle.

[0040] The cell cover plate 10 in the embodiment of the present application is described in detail below.

[0041] Please refer to Figures 2 to 4 The cell cover plate 10 provided in the embodiment of the present application includes a cover body 11 and a first convex rib 12. The cover body 11 includes a first surface m1 and a second surface m2 which are arranged opposite to each other in the thickness direction thereof, and the second surface m2 is arranged to face the inside of the cell 100. The first convex rib 12 is recessed in the first surface m1 and protrudes relative to the second surface m2. A thinning portion 13 is provided on the first convex rib 12.

[0042] The cover body 11 is generally plate-shaped, and its dimension in the thickness direction is the smallest. The cover body 11 is usually made of metal (such as aluminum, stainless steel), and the cover body 11 and the first rib 12 are mostly connected in one piece.

[0043] When the cell cover plate 10 is applied to the cell 100, the first surface m1 of the cover body 11 is disposed toward the outside of the cell 100, and the second surface m2 of the cover body 11 is disposed toward the inside of the cell 100. The first convex rib 12 is disposed toward the inside of the cell 100 relative to the second surface m2, and is recessed on the first surface m1. In actual processing, the first convex rib 12 can be formed by stamping on the cover body 11.

[0044] The thinning portion 13 is an explosion-proof structure obtained by thinning a part of the first convex rib 12, and can be specifically an indentation or notch set on the first convex rib 12. The width direction of the thinning portion 13 corresponds to the width direction of the first convex rib 12, and is substantially extended in the same direction as the first convex rib 12. When the first convex rib 12 is in the shape of an elongated strip, the thinning portion 13 is substantially in the shape of an elongated strip. When the first convex rib 12 is in the shape of an annulus, the thinning portion 13 can be in the shape of an annulus or an arc.

[0045] Due to the thinning process, the explosion-proof structure formed by the thinned portion 13 has low strength. When the internal gas pressure of the battery cell 100 exceeds a threshold, the high-pressure gas inside the battery cell 100 can break through the thinned portion 13 to complete the pressure relief of the battery cell 100.

[0046] The cell cover plate 10 is provided with a thinned portion 13 on the first convex rib 12 as an explosion-proof structure. Since the first convex rib 12 protrudes toward the inner side of the cell 100, external physical collision or impact cannot directly act on the explosion-proof structure formed by the thinned portion 13, thereby reducing the probability of premature damage and pressure release of the explosion-proof structure, and improving the reliability of the cell 100. In addition, the first convex rib 12 can also strengthen the strength of the cell cover plate 10.

[0047] In some embodiments, reference Figure 4 The thinning portion 13 is arranged on the concave surface and / or the convex surface of the first rib 12.

[0048] The concave surface of the first convex rib 12 refers to the surface connected to the first surface m1, which is disposed facing the outside of the battery cell 100. The convex surface of the first convex rib 12 refers to the surface connected to the second surface m2, which is disposed facing the inside of the battery cell 100. The thinning surface refers to the surface where the thinning portion 13 is located. In these embodiments, both the concave surface and the convex surface can be used as the thinning surface, that is, the thinning portion 13 can be disposed on the concave surface or on the convex surface.

[0049] At this time, the location of the thinning portion 13 is more flexible and diverse.

[0050] In some embodiments, reference Figure 4 The maximum opening width L1 of the concave surface of the first convex rib 12 and the maximum distance s between the center of the thinned portion 13 and the opening end of the corresponding concave surface in the width direction of the first convex rib 12 satisfy: 0≤s≤L1 / 2.

[0051] like Figure 2 As shown, the distance L1 refers to the maximum width of the opening end of the concave surface of the first convex rib 12. The distance s refers to the maximum distance between the center of the thinned portion 13 (referring to the projection of the center of the thinned portion 13 on the concave surface of the first convex rib 12 along the thickness direction of the first convex rib 12) and the opening end of the concave surface in the width direction of the first convex rib 12.

[0052] Understandable, refer to Figure 5 The first convex rib 12 is composed of an end portion 12a and a side wall portion 12b which are integrally connected and intersected. The end portion 12a and the cover body 11 are staggered in the thickness direction, and the side wall portion 12b is connected between the end portion 12a and the cover body 11. The end portion 12a is an end of the first convex rib 12 in the thickness direction of the cover body 11, and it extends the farthest into the battery cell 100. The side wall portion 12b is arranged around the periphery of the end portion 12a and is roughly cylindrical. The side wall portion 12b extends roughly in the thickness direction of the cover body 11.

[0053] When 0≤s≤L1 / 2, it means that the thinning portion 13 can be located at the side wall portion 12b or at the end portion 12a. In this way, the location of the thinning portion 13 is more flexible and diverse.

[0054] It should be noted that the closer the value of s is to L1 / 2, the better. In this way, the thinning portion 13 is arranged close to the center of the first rib 12, which makes it easier to arrange the thinning portion 13. Preferably, s=L1 / 2.

[0055] In some embodiments, reference Figure 2 The first convex rib 12 is arranged in a circular ring shape, the thinning portion 13 is extended around the center of the first convex rib 12, and the center angle θ of the thinning portion 13 satisfies: 180°≤θ≤360°.

[0056] The first convex rib 12 is annular, and the thinned portion 13 is arc-shaped or circumferential, and is concentric with the first convex rib 12. Specifically, the central angle θ of the thinned portion 13 can be selected as 180°, 210°, 240°, 270°, 300°, 330°, 360°, and any value between adjacent selected values.

[0057] The first convex rib 12 is in a circular ring shape, and the strength of the circular battery cover 10 is increased more evenly. In this case, the battery cover 10 is more suitable for the cylindrical battery 100. The extended shape of the thinning portion 13 follows the setting of the first convex rib 12. The larger the central angle of the thinning portion 13, the larger its bursting area. When the battery 100 fails thermally, the gas and pressure can be discharged in time.

[0058] In some embodiments, reference Figure 4 The wall thickness h of the thinned portion 13 and the wall thickness H of the first rib 12 satisfy: 1%≤h / H≤80%.

[0059] The wall thickness h of the thinned portion 13 refers to the thickness of the remaining portion of the first convex rib 12 after thinning. Usually, the wall thickness of each portion of the first convex rib 12 is equal. If the wall thickness of the first convex rib 12 is not equal, the wall thickness H can be understood as its average wall thickness. Similarly, the wall thickness of each portion of the thinned portion 13 is usually equal. If it is not equal, the average wall thickness is taken.

[0060] The ratio of h / H is between 1% and 80%. Specifically, h / H can be 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and any value between adjacent values.

[0061] The smaller h / H is, the lower the strength of the thinned portion 13 is, and the easier it is to be broken by air pressure. The battery cell 100 is safer, but has a shorter service life. On the contrary, the larger h / H is, the stronger the thinned portion 13 is, and it can withstand a larger air pressure without being broken. The battery cell 100 is less safe, but has a longer service life. When h / H is within the above range, the battery cell 100 can have both higher safety and longer service life.

[0062] In some embodiments, the cell cover plate 10 further includes a protective layer (not shown), and the protective layer covers the thinned portion 13 .

[0063] The protective layer can be a nickel layer, an oil layer, a rubber layer, etc. The protective layer can be disposed on the thinning portion 13 by spraying to isolate the thinning portion 13 from the air, reduce the probability of the thinning portion 13 being corroded and oxidized, improve the reliability of the thinning portion 13, and reduce the probability of its premature pressure relief.

[0064] In some embodiments, reference Figures 2 to 4 The cell cover plate 10 further includes a second convex rib 14, which is recessed in the first surface m1 and protrudes relative to the second surface m2. The protrusion distance of the second convex rib 14 relative to the second surface m2 is greater than the protrusion distance of the first convex rib 12 relative to the second surface m2.

[0065] Specifically, the second convex rib 14 can be stamped and formed integrally on the cover body 11. The second convex rib 14 is the same as the first convex rib 12, and both protrude toward the inside of the battery cell 100. The provision of the second convex rib 14 can not only strengthen the strength of the battery cell cover plate 10, but also in actual application, the second convex rib 14 can serve as a bridge to electrically connect the battery cell cover plate 10 with the electrode assembly 30, so that the battery cell cover plate 10 is charged, and the number of poles 50 on the battery cell 100 is reduced, thereby reducing the cost of the battery cell 100.

[0066] At this time, the protruding distance of the second convex rib 14 is greater than the protruding distance of the first convex rib 12, that is, the second convex rib 14 is deeper into the battery cell 100 than the first convex rib 12, so that the first convex rib 12 will not affect the electrical connection between the second convex rib 14 and the electrode assembly 30, so that the battery cell cover plate 10 can be reliably electrically connected to the electrode assembly 30, thereby improving the reliability of the battery cell 100. In addition, there can be a gap between the first convex rib 12 and the internal structure of the battery cell 100 (such as the current collecting plate 40), so as to avoid the thinning portion 13 from being blocked, which is conducive to smooth pressure relief.

[0067] In some embodiments, reference Figure 4 The cell cover 10 is a circular cover, and the maximum opening width L1 of the concave surface of the first convex rib 12, the maximum opening width L2 of the concave surface of the second convex rib 14 and the diameter R of the cell cover 10 satisfy: 5%R≤L1≤50%R, 5%R≤L2≤50%R.

[0068] As mentioned above, the maximum opening width L1 of the concave surface of the first convex rib 12 refers to the maximum width at the opening end of the concave surface. Similarly, the maximum opening width L2 of the concave surface of the second convex rib 14 refers to the maximum width at the opening end of the concave surface. The cell cover 10 is a circular cover that can accommodate cylindrical cells.

[0069] L1 and R satisfy 5%R≤L1≤50%R, that is, L1 / R is between 5% and 50%. L2 and R satisfy 5%R≤L2≤50%R, that is, L2 / R is between 5% and 50%. Specifically, L1 / R and L2 / R can be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% and any value between adjacent values.

[0070] If L1 is too small, it is not conducive to the arrangement of the thinning portion 13. If L1 is too large, it will occupy the position of other structures on the cell cover plate 10, which is not conducive to the layout of the cell cover plate 10. Similarly, if L2 is too small, it is not conducive to the electrical connection between the cell cover plate 10 and the electrode assembly 30. If L2 is too large, it will occupy the position of other structures on the cell cover plate 10, which is not conducive to the layout of the cell cover plate 10.

[0071] When L1 and L2 are within the above range, it is not only easy to set the thinned portion 13 , but also the cell cover plate 10 and the electrode assembly 30 can be reliably electrically connected, and the layout of the cell cover plate 10 is also convenient.

[0072] Specifically in some embodiments, refer to Figure 2 and Figure 3 The first convex rib 12 is arranged in a circular ring shape, and the second convex rib 14 is arranged on the inner side and / or the outer side of the ring of the first convex rib 12. At this time, the second convex rib 14 can be configured in large numbers, which can increase the electrical connection area and make the electrical connection more reliable.

[0073] In some embodiments, reference Figure 2 and Figure 3 The battery cover 10 also includes a liquid injection port 15, which passes through the first surface m1 and the second surface m2. The liquid injection port 15 is used to fill the electrolyte. The liquid injection port 15 can be set at the center of the annular first convex rib 12. At this time, the battery cover 10 can also be used for liquid injection, and the function is more abundant. Understandably, the battery 100 includes a sealing nail 60, which is set at the liquid injection port 15 and is used to seal the liquid injection port 15.

[0074] In a second aspect, the embodiment of the present application provides a battery cell 100, comprising a housing 20, an electrode assembly 30 and a battery cell cover plate 10 as in the above embodiment, wherein the electrode assembly 30 is accommodated in the housing 20, and the battery cell cover plate 10 covers the housing 20. The battery cell 100 includes the beneficial effects of the above embodiment.

[0075] In some embodiments, reference Figure 1 The battery cell 100 further includes a current collecting plate 40 and a pole 50. The pole 50 is located at one end of the housing 20 away from the battery cell cover plate 10 and is electrically connected to one end of the electrode assembly 30. The current collecting plate 40 is located between the electrode assembly 30 and the battery cell cover plate 10 and is electrically connected to the other end of the electrode assembly 30. The battery cell cover plate 10 includes a second convex rib 14, and the battery cell cover plate 10 is electrically connected to the current collecting plate 40 via the second convex rib 14.

[0076] The current collecting plate 40 is used to collect the current of the electrode assembly 30, and is usually made of metal. The current collecting plate 40 is conductively connected between the electrode assembly 30 and the cover of the battery cell 100, so that the two can be more reliably electrically connected. Specifically, due to the presence of the first rib 12, a second rib 14 is provided on the battery cell cover plate 10, and the second rib 14 is arranged to protrude closer to the inside of the battery cell 100 relative to the first rib 12. The second rib 14 can effectively abut against the current collecting plate 40, so that the battery cell cover plate 10 is electrically connected to the current collecting plate 40. Moreover, there is a gap between the first rib 12 and the current collecting plate 40 to prevent the thinning portion 13 from being blocked by the current collecting plate 40.

[0077] In a third aspect, an embodiment of the present application provides a battery, comprising the battery cell 100 as described above.

[0078] In a fourth aspect, an embodiment of the present application provides an electrical device, comprising the above-mentioned battery, and the battery is used to provide electrical energy.

[0079] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0080] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A battery cell cover, characterized in that: include: A cover body (11) comprising a first surface (m1) and a second surface (m2) disposed opposite to each other in a thickness direction thereof, wherein the second surface (m2) is configured to be disposed toward the interior of the battery cell; The first convex rib (12) is recessed on the first surface (m1) and protrudes relative to the second surface (m2), and a thinning portion (13) is provided on the first convex rib (12).

2. The cell cover plate according to claim 1, characterized in that: The thinned portion (13) is arranged on the concave surface and / or the convex surface of the first convex rib (12).

3. The cell cover plate according to claim 1, characterized in that: The maximum opening width L1 of the concave surface of the first convex rib (12) and the maximum distance s between the center of the thinned portion (13) in the width direction of the first convex rib (12) and the opening end corresponding to the concave surface satisfy: 0≤s≤L1 / 2.

4. The cell cover plate according to claim 1, characterized in that: The first convex rib (12) is arranged in a circular ring shape, the thinning portion (13) is extended around the center of the first convex rib (12), and the center angle θ of the thinning portion (13) satisfies: 180°≤θ≤360°; and / or, The wall thickness h of the thinned portion (13) and the wall thickness H of the first rib (12) satisfy the following relationship: 1%≤h / H≤80%; and / or, The cell cover plate further comprises a protective layer, wherein the protective layer covers the thinned portion (13).

5. The battery cell cover according to any one of claims 1 to 4, characterized in that: The cell cover plate further comprises a second convex rib (14), wherein the second convex rib (14) is recessed on the first surface (m1) and protrudes relative to the second surface (m2); The protruding distance of the second convex rib (14) relative to the second surface (m2) is greater than the protruding distance of the first convex rib (12) relative to the second surface (m2).

6. The cell cover plate according to claim 5, characterized in that: The cell cover is a circular cover, and the maximum opening width L1 of the concave surface of the first convex rib (12), the maximum opening width L2 of the concave surface of the second convex rib (14) and the diameter R of the cell cover satisfy the following conditions: 5%R≤L1≤50%R, 5%R≤L2≤50%R.

7. A battery cell, characterized in that: It comprises a shell (20), an electrode assembly (30) and a cell cover plate according to any one of claims 1 to 6, wherein the electrode assembly (30) is accommodated in the shell (20), and the cell cover plate covers the shell (20).

8. The battery cell according to claim 7, characterized in that: The battery cell further comprises a current collecting plate (40) and a pole (50); the pole (50) is located at one end of the housing (20) away from the battery cell cover plate and is electrically connected to one end of the electrode assembly (30); the current collecting plate (40) is located between the electrode assembly (30) and the battery cell cover plate and is electrically connected to the other end of the electrode assembly (30); The cell cover plate comprises a second convex rib (14), and the cell cover plate is electrically connected to the current collecting plate (40) via the second convex rib (14).

9. A battery, characterized in that: Comprising the battery cell as claimed in claim 7 or 8.

10. An electrical device, characterized in that: Comprising a battery as claimed in claim 9, the battery is used to provide electrical energy.

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