Cover plate, battery cell and electric device

Abstract

The application relates to the technical field of batteries, in particular to a cover plate, a battery cell and a power utilization device. The disclosed cover plate comprises a cover plate body, a connecting block and a pole; a sunken groove is arranged on the first side of the cover plate body; a mounting hole is arranged on the sunken groove; the connecting block is arranged on the first side of the cover plate body; the pole is arranged on the second side of the cover plate body, the first side and the second side are oppositely arranged in the thickness direction of the cover plate; the pole at least partially penetrates through the mounting hole and is connected with the connecting block; in the thickness direction of the cover plate, the connecting block or the pole is at least partially located in the sunken groove; the thickness of the cover plate body is T, the depth of the sunken groove is h, and T and h satisfy the condition: 0.33 >= h / T >= 0.08. The cover plate in the application can improve the shoulder height of the battery cell, effectively increase the internal space of the battery cell and improve the capacity of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a cover plate, a battery cell, and an electrical device. Background Technology

[0002] The aluminum plates, connecting blocks, and terminals in a battery cell are usually connected by welding. In order to prevent the heat generated by welding from affecting the plastic parts, the connecting blocks and terminals need to have a certain thickness. This causes the terminals to occupy the internal space of the battery cell, thus affecting the capacity of the battery cell. Utility Model Content

[0003] In view of this, this application aims to at least partially solve one of the technical problems in the related art. To this end, this application provides a cover plate, a battery cell, and an electrical device that can increase the shoulder height of the battery cell, thereby effectively increasing the internal space of the battery cell and increasing the battery capacity.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows:

[0005] According to one aspect of this application, this application provides a cover plate, comprising:

[0006] The cover plate body has a recessed groove on its first side; the recessed groove has mounting holes.

[0007] A connecting block is provided on the first side of the cover plate body;

[0008] A pole post is provided on the second side of the cover plate body; the first side and the second side are arranged opposite to each other in the thickness direction of the cover plate.

[0009] The pole at least partially passes through the mounting hole and is connected to the connecting block; in the thickness direction of the cover plate, the connecting block or the pole at least partially lies in the sinking groove; the thickness of the cover plate body is T, the depth of the sinking groove is h, and T and h satisfy: 0.33≥h / T≥0.08.

[0010] In some of these embodiments, the thickness of the cover plate body is T in the thickness direction of the cover plate, wherein T satisfies: 1.5mm ≤ T ≤ 3mm.

[0011] In some embodiments, the depth of the sink is h in the thickness direction of the cover plate, wherein h satisfies: 0.2 mm ≤ h ≤ 1.0 mm.

[0012] In some embodiments, a first plastic part and a second plastic part are also included;

[0013] The first plastic component is disposed on the first side of the cover plate body, the first plastic component is sleeved on at least part of the connecting block, and the first plastic component is installed in the sink.

[0014] The second plastic component is disposed on the second side of the cover plate body, and the pole passes through the second plastic component, the mounting hole, and the first plastic component in sequence to connect with the connecting block.

[0015] In some embodiments, the thickness of the connecting block is A in the thickness direction of the cover plate, wherein A satisfies: A≥2.5mm.

[0016] In some of these embodiments, the first plastic part includes a clamping portion and a protrusion.

[0017] The protrusion is at least partially attached to the outer side wall of the connecting block;

[0018] In the thickness direction of the cover plate, the clamping part is located between the upper surface of the sink and the connecting block, and the size of the clamping part is B, wherein B satisfies: B≥0.7mm.

[0019] In some embodiments, when the pole passes through the cover plate body and connects with the connecting block in the thickness direction of the cover plate, the dimension from the upper surface of the cover plate body to the end of the connecting block is H2, and H2 satisfies: H2=A+Bh.

[0020] According to a second aspect of this application, this application also provides a battery cell, including: the cover plate described in any embodiment of the first aspect of this application.

[0021] In some embodiments, the battery cell further includes a housing; the housing has an electrode assembly, and at least one end of the housing has the cover plate;

[0022] The length of the battery cell is L, and the shoulder height of the battery cell is L1, where L1 = Lh.

[0023] According to a third aspect of this application, this application also provides an electrical device, comprising: the cover plate described in any embodiment of the first aspect of this application;

[0024] And / or, the battery cell described in any embodiment of the second aspect of this application.

[0025] The technical solution of this application has at least the following beneficial effects:

[0026] 1. In this application, by setting a groove on the cover plate body and setting an installation hole in the groove, the terminal post can pass through one side of the cover plate body and connect to the connecting block on the other side. The connecting block or the terminal post can be partially located in the groove, ensuring that the connecting block, the terminal post and the cover plate body on the cover plate reach the basic thickness, ensuring that the cover plate has good strength, and also effectively reducing the height of the terminal post in the cell, thereby increasing the shoulder height of the cell and making the battery have a higher capacity.

[0027] 2. In a preferred embodiment of this application, by limiting the thickness of the cover plate body to T and the depth of the sink to h, where T and h satisfy: 0.33≥h / T≥0.08, the cover plate body, connecting block and electrode post can have good rigidity, which can protect the electrode group in the cell from external force damage; at the same time, by adjusting the range of the above ratio, the overall height of the cover plate is reduced, improving the space utilization of the cell, and thus increasing the capacity of the cell while keeping the length of the cell unchanged.

[0028] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0030] Figure 1 The diagram shown is a schematic of the cover plate structure provided in this application. Figure 1 ;

[0031] Figure 2 The diagram shown is a schematic of the cover plate structure provided in this application. Figure 2 ;

[0032] Figure 3 The figure shown is a side view of the cover plate structure provided in this application;

[0033] Figure 4 The diagram shown is a top view of the cover plate structure provided in this application;

[0034] Figure 5 As shown Figure 4 The provided schematic diagram of the AA' section structure of the cover plate;

[0035] Figure 6 The diagram shown is a schematic diagram of the battery cell planar structure provided in this application;

[0036] Figure 7 The diagram shown is a schematic diagram of the cell structure provided in this application.

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

[0038] 10 — Battery cell;

[0039] 100—Cover plate;

[0040] 110—Cover plate body; 110a—First side; 110b—Second side; 111—Sinking groove; 112—Mounting hole; 120—Connecting block; 130—First plastic part; 131—Clamping part; 132—Protrusion; 140—Pole post; 150—Second plastic part; 160—Explosion-proof valve;

[0041] 200 — Shell.

[0042] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0043] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0044] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges or individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0045] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0046] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0047] A battery cell includes electrode assembly, casing, aluminum plate, terminals, plastic parts, and connecting blocks. The electrode assembly is housed inside the casing, with a cover plate connected to the open end of the casing. The terminals pass through the aluminum plate from one side to the other and connect to the connecting blocks. Typically, the connecting blocks and terminals are welded together. Plastic parts are fitted onto the connecting blocks, serving to insulate the terminals and aluminum plate while also increasing the cell's sealing performance. To prevent damage to the electrode assembly from external impacts and to prevent the heat generated during welding from melting the plastic parts and causing insufficient bonding, the aluminum plate and connecting blocks need to have a certain thickness. During welding, heat transfer is slow, resulting in less heat being transferred to the plastic parts, effectively reducing their impact. However, ensuring sufficient thickness for the plastic parts and connecting blocks, and a certain length for the terminals, may encroach on the internal space of the cell, thus affecting the battery's capacity.

[0048] In view of the technical problems existing in the prior art, this application provides a cover plate, a battery cell, and an electrical device. By setting a groove on the cover plate body and reasonably designing the groove depth and the cover plate body thickness, the shoulder height of the battery cell can be increased while keeping the length of the battery cell unchanged, thereby effectively increasing the internal space of the battery cell and increasing the battery capacity.

[0049] The specific technical solution of this application is as follows:

[0050] In some embodiments of this application, a cover plate is provided, including: a cover plate body 110, a connecting block 120, and a pole post 140. A groove 111 is provided on a first side 110a of the cover plate body 110; a mounting hole 112 is provided on the groove 111; the connecting block 120 is disposed on the first side 110a of the cover plate body 110; the pole post 140 is disposed on a second side 110b of the cover plate body 110. The first side 110a and the second side 110b are disposed opposite to each other in the thickness direction of the cover plate; the pole post 140 passes through the mounting hole 112 at least partially and is connected to the connecting block 120, and the connecting block 120 or the pole post 140 is at least partially located in the groove 111 along the thickness direction of the cover plate.

[0051] refer to Figure 1 and Figure 2The cover plate body 110 can be made of metal, such as aluminum, copper, or aluminum alloy; the pole post 140 and the connecting block 120 can also be made of the same or different metal materials. The cover plate 100 is disposed on any side of the pole group, which can be any one side of the pole group, or any two or more sides of the pole group; in the thickness direction of the cover plate 100, the first side 110a and the second side 110b of the cover plate body 110 are disposed on both sides of the cover plate body 110; a recessed groove 111 is provided on the first side 110a of the cover plate body 110 in the cover plate 100. It can be understood that the shape of the cover plate body 110 can be circular, elliptical, or rectangular, etc., and the top view shape of the recessed groove 111 can also be circular, elliptical, or rectangular, etc. Of course, the shape of the recessed groove 111 can be consistent with the shape of the cover plate body 110 or not, and this application does not make specific limitations on this. The cover plate body 110 is also provided with mounting holes 112, and the mounting holes 112 are located in the recess 111. The number of mounting holes 112 can be one, two, three or more. In a preferred embodiment, the recess 111 is located on the side of the cover plate body 110 away from the electrode assembly in the thickness direction of the cover plate. The connecting block 120 and the electrode post 140 are respectively provided on both sides of the cover plate body 110. The connecting block 120 can be located on the side with the recess 111, i.e., the first side 110a; or the electrode post 112 can be located on the side with the recess 111. The electrode post 140 can pass through the mounting hole 112 and be connected to the connecting block 120 located on the other side of the cover plate body 110 by means of bonding, welding or other methods. When the terminal post 140 passes through the mounting hole 112 and connects to the connecting block 120, part of the connecting block 120 or the terminal post 140 is installed in the sink 111. In this way, the connecting block 120, the cover plate body 110 and the terminal post 140 can achieve the basic thickness, thereby reducing the overall thickness of the cover plate 100. While keeping the total length of the cell unchanged, the shoulder height of the cell can be increased, thereby increasing the internal space of the cell and effectively improving the battery capacity.

[0052] It is understood that, in the thickness direction of the cover plate, those skilled in the art can, based on this application, adjust the thickness, depth, etc. of any one or more of the sink 111, cover plate body 110, pole post 140, and connecting block 120 to make the cover plate have good mechanical strength, while also ensuring that welding the cover plate will not affect or reduce the impact on plastic parts, and prevent the risk of glue leakage; in addition, it can effectively increase the internal space of the battery cell, thereby increasing its capacity.

[0053] In some embodiments, in the thickness direction of the cover plate, the thickness of the cover plate body 110 is T, and the depth of the sink 111 is h, where T and h satisfy: 0.33≥h / T≥0.08.

[0054] refer to Figure 4 and Figure 5 It is understood that the h / T ratio can be any one of 0.08, 0.09, 0.10, 0.15, 0.20, 0.25, 0.30, 0.31, or 0.33, or any value between any two. By limiting the ratio of the depth h of the groove 111 to the thickness T of the cover plate body 110 in the thickness direction of the cover plate, it is possible to ensure that the cover plate body 110, the electrode post 140, and the connecting block 120 have a certain thickness, giving them good rigidity and protecting the electrode assembly of the battery cell from external damage. At the same time, by adjusting the range of the above ratio, the overall height of the cover plate is reduced, improving the space utilization of the battery cell, and thus increasing the capacity of the battery cell while keeping the length of the battery cell unchanged. That is, through the above limitation, under the same conditions, the cover plate in any embodiment of this application can increase the capacity of the battery cell, thereby improving the range of the battery pack. If h / T is less than the above range, the space utilization of the battery cell may not be effectively improved, thus the battery cell may not be able to effectively increase its capacity. If the above ratio is greater than the above range, that is, the depth of the sink is too large, the rigidity of the sink 111 part in the cover plate body 110 may be reduced, thus making the cover plate body 110 easy to bend, break, etc., which may easily damage the battery cell.

[0055] The cover plate provided in this application has a groove on the cover plate body and a mounting hole in the groove. The terminal post can pass through one side of the cover plate body and connect to the connecting block on the other side. The connecting block or the terminal post can be partially located in the groove. This ensures that the connecting block, the terminal post and the cover plate body on the cover plate reach the basic thickness. While ensuring that the cover plate has good strength, it can also effectively reduce the height of the terminal post in the cell, thereby increasing the shoulder height of the cell and enabling the battery to have a higher capacity.

[0056] In some embodiments, the thickness of the cover plate body 110 in the thickness direction of the cover plate is T, where T satisfies: 1.5mm≤T≤3mm.

[0057] refer to Figure 3 and Figure 5In the thickness direction of the cover plate, the thickness T of the cover plate body 110 can be any one of 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.2mm, 2.5mm, 2.8mm, or 3.0mm, or any value between any two. By further limiting the thickness of the cover plate body 110, good mechanical strength can be ensured, making the cover plate body 110 less prone to damage during assembly and use, and ensuring that the cover plate is firmly welded to the cell housing 200, preventing the explosion points and heat generated during the welding process from affecting the cover plate. If the thickness of the cover plate body 110 exceeds the above range, the cover plate 100 may encroach on the internal space of the cell, resulting in waste of raw materials and increased costs. If it is less than the above range, the cover plate body 110 may be easily bent or broken, making the cover plate 100 easily damaged.

[0058] In some embodiments, the depth of the groove 111 in the thickness direction of the cover plate is h, where h satisfies: 0.2mm≤h≤1.0mm.

[0059] refer to Figure 3 and Figure 5 In the thickness direction of the cover plate, the depth h of the groove 111 can be any one of 0.2mm, 0.3mm, 0.4mm, 0.4mm, 0.5mm, 0.8mm or 1.0mm, or any value between any two. By limiting the depth of the groove 111, the length of the electrode 140 can be effectively reduced while ensuring the rigidity of the cover plate 100, thereby increasing the shoulder height of the battery cell. Under the same conditions, the capacity of the battery cell will be effectively increased. If it exceeds the above range, it will affect the overall rigidity of the cover plate body 110. If it is less than the above range, it may not effectively reduce the height of the electrode 140, thereby failing to increase the shoulder height of the battery cell and affecting the capacity of the battery cell.

[0060] In some embodiments, the system further includes a first plastic component 130 and a second plastic component 150; the first plastic component 130 is disposed on a first side 110a of the cover plate body 110, the first plastic component 130 is sleeved on at least a portion of the connecting block 120, and the first plastic component 130 is installed in the recess 111; the second plastic component 150 is disposed on a second side 110b of the cover plate body 110, and the pole post 140 passes through the second plastic component 150, the mounting hole 112, and the first plastic component 130 in sequence, and is connected to the connecting block 120.

[0061] refer to Figure 1The materials of the first plastic part 130 and the second plastic part 150 include, but are not limited to, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene fluoride, polyurethane or rubber; of course, it is understood that the materials of the first plastic part 130 and the second plastic part 150 may be the same or different. The first plastic component 130 and the second plastic component 150 are respectively disposed on both sides of the cover plate body 110. In a preferred embodiment, the first plastic component 130 and the connecting block 120 are located on the same side of the cover plate body 110, i.e., the first side 110a; and the first plastic component 130 is sleeved on the connecting block 120 and is installed on the recess 111 with the connecting block 120. The recess 111 is disposed on the side of the cover plate body 110 away from the electrode group; the second plastic component 150 is disposed on the other side of the cover plate body 110, i.e., on the side of the cover plate body 110 close to the electrode group, i.e., on the second side 110b of the cover plate body 110. The electrode post 140 passes through the second plastic component 150, the mounting hole 112, and the first plastic component 130 and the connecting block 120, thereby the first plastic component 130 and the second plastic component 150 play the role of insulation and sealing of the battery cell.

[0062] In some embodiments, the thickness of the connecting block 120 in the thickness direction of the cover plate is A, where A satisfies: A≥2.5mm.

[0063] refer to Figure 1 and Figure 3 In the thickness direction of the cover plate, the thickness A of the connecting block 120 can be any value of 2.5mm, 3mm, 4mm or 5mm or more. By limiting the thickness of the connecting block 120, it can be ensured that the connecting block 120 and the pole post 140 are firmly connected, and the heat generated when welding the connecting block 120 and the pole post 140 can be reduced to reduce the impact of the heat generated on the first plastic part 130. If the thickness is less than the above range, the heat generated will have a greater impact on the insulating material, especially the first plastic part 130 made of polymer material, resulting in the risk of insufficient glue, which in turn affects the safety performance of the battery cell.

[0064] In some embodiments, the first plastic part 130 includes a clamping portion 131 and a protrusion 132; the protrusion 132 is at least partially attached to the outer side wall of the connecting block 120; in the thickness direction of the cover plate, the clamping portion 131 is located between the upper surface of the sink 111 and the connecting block 120, and the size of the clamping portion 131 is B, where B satisfies: B≥0.7mm.

[0065] refer to Figure 1 and Figure 3The clamping portion 131 and the protrusion 132 of the first plastic part 130 have a cross-sectional profile similar to an "L" shape. In the thickness direction of the cover plate, the thickness B of the clamping portion 131 located in the recess 111 can be any value of 0.7mm, 0.8mm, 0.9mm or 1.0mm or more. By limiting the thickness of the clamping portion 131 in the first plastic part 130, the injection molding filling requirements can be met, and the problem of insufficient glue can be prevented.

[0066] In some embodiments, when the pole post 140 passes through the cover plate body 110 and connects with the connecting block 120 in the thickness direction of the cover plate, the dimension from the upper surface of the cover plate body 110 to the end of the connecting block 120 is H2, and H2 satisfies: H2=A+Bh.

[0067] refer to Figure 5 When the terminal post 140 passes through the cover plate body 110 and connects with the connecting block 120 on the other side of the cover plate body 110, the dimension from the upper surface of the cover plate body 110 to the end of the connecting block 120 in the thickness direction of the cover plate is H2. When the thickness of the clamping part 131 of the first plastic part 130 in the sink 111 is B, the thickness of the connecting block 120 is A, and the depth of the sink 111 is h, then H2 = A + Bh. This ensures that under the same conditions, with the same thickness of the connecting block 120, the cover plate body 110, etc., the thickness of the cover plate 100 can be effectively reduced, thereby increasing the shoulder height of the battery cell and improving the space utilization rate of the battery cell.

[0068] In some embodiments of this application, a battery cell 10 is also provided, including: the cover plate 100 in any of the above embodiments.

[0069] In some embodiments, the battery cell 10 further includes a housing 200; the housing 200 is provided with an electrode group, and at least one end of the housing 200 is provided with a cover plate 100; the length of the battery cell 10 is L, and the shoulder height of the battery cell 10 is L1, where L1 = Lh.

[0070] refer to Figure 6 and Figure 7 It is understood that the housing 200 of the battery cell 10 has a cover plate 100 at one, two, or three or more ends. When the housing 200 has a cover plate 100 at one end, the cover plate 100 is also provided with an electrode post 140, or an explosion-proof valve 160, a liquid injection hole, etc. The length of the battery cell 10 is L. Using the cover plate 100 in any of the above embodiments, the shoulder height of the battery cell 10 is L1, and the depth of the sink 111 is h, L1 = Lh. Compared with the battery cell 10 under the same conditions, its internal space is improved, that is, the space utilization rate of the battery cell is improved, which can improve the capacity of the battery cell.

[0071] In some embodiments of this application, an electrical device is also provided, including: the cover plate 100 in any of the above embodiments.

[0072] In some embodiments, the electrical device further includes the battery cell 10 from any of the above embodiments.

[0073] It is understood that the electrical devices in the above embodiments include, but are not limited to, electric vehicles, aircraft, cameras, or electric toys.

[0074] The parts not described in detail in this application are techniques known to those skilled in the art.

[0075] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0076] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0077] It should be noted that the terms "and / or" or " / " used herein are merely descriptions of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The singular forms "a," "the," and "the" used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0078] In the detailed description and claims, a list of items connected by the terms "at least one of," "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may contain a single element or multiple elements. Item B may contain a single element or multiple elements. Item C may contain a single element or multiple elements.

[0079] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A cover plate disposed on any side of an electrode assembly, characterized in that, include: The cover plate body has a recessed groove on its first side; the recessed groove has mounting holes. A connecting block is provided on the first side of the cover plate body; A pole post is provided on the second side of the cover plate body; the first side and the second side are arranged opposite to each other in the thickness direction of the cover plate. The pole at least partially passes through the mounting hole and is connected to the connecting block; in the thickness direction of the cover plate, the connecting block or the pole at least partially lies in the sinking groove; the thickness of the cover plate body is T, the depth of the sinking groove is h, and T and h satisfy: 0.33≥h / T≥0.

08.

2. The cover plate according to claim 1, characterized in that, In the thickness direction of the cover plate, the thickness of the cover plate body is T, and T satisfies: 1.5mm≤T≤3mm.

3. The cover plate according to claim 1, characterized in that, In the thickness direction of the cover plate, the depth of the sink is h, and h satisfies: 0.2mm≤h≤1.0mm.

4. The cover plate according to any one of claims 1 to 3, characterized in that, It also includes a first plastic part and a second plastic part; The first plastic component is disposed on the first side of the cover plate body, the first plastic component is sleeved on at least part of the connecting block, and the first plastic component is installed in the sink. The second plastic component is disposed on the second side of the cover plate body, and the pole passes through the second plastic component, the mounting hole, and the first plastic component in sequence to connect with the connecting block.

5. The cover plate according to claim 4, characterized in that, In the thickness direction of the cover plate, the thickness of the connecting block is A, and A satisfies: A≥2.5mm.

6. The cover plate according to claim 4, characterized in that, The first plastic part includes a clamping part and a protrusion; The protrusion is at least partially attached to the outer side wall of the connecting block; In the thickness direction of the cover plate, the clamping part is located between the upper surface of the sink and the connecting block, and the size of the clamping part is B, wherein B satisfies: B≥0.7mm.

7. The cover plate according to claim 4, characterized in that, In the thickness direction of the cover plate, when the pole passes through the cover plate body and connects with the connecting block, the dimension from the upper surface of the cover plate body to the end of the connecting block is H2, and H2 satisfies: H2=A+Bh.

8. A battery cell, characterized in that, include: The cover plate according to any one of claims 1 to 7.

9. The battery cell according to claim 8, characterized in that, It also includes a housing; the housing is provided with an electrode assembly, and the cover plate is provided at at least one end of the housing; The length of the battery cell is L, and the shoulder height of the battery cell is L1, where L1 = Lh.

10. An electrical device, characterized in that, include: The cover plate according to any one of claims 1 to 7; And / or, the battery cell as described in claim 8 or 9.

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