Battery cell cover plate and battery cell

Abstract

The invention relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. According to the battery cell cover plate, a connecting piece is arranged on the side, facing the interior of a battery cell, of a pole column, a first connecting part and a second connecting part on the connecting piece are arranged on the same side of a connecting body in the first direction, the connecting piece and the pole column are connected to form a whole cover plate, the connecting piece on the cover plate is directly connected with a tab on a pole group, and a fusing protection part is arranged on the connecting piece. The first connection portion and the second connection portion are connected via a fuse protection portion. According to the invention, the connection of the pole and the tab can be realized without bending a connecting piece, so that the insulation failure caused by shell contact is avoided, and the problem of tab tearing caused by core combination is also solved. Besides, a separation groove is formed between the first connecting part and the second connecting part in the second direction, and the insulating part is embedded in the separation groove, so that the risk of thermal runaway of the battery cell caused by the fact that the current does not pass through the fusing protection area in the use process of the battery cell is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and more particularly to a cell cover plate and a cell. Background Art

[0002] For traditional cells, especially those using the stacking process route, due to the limitation of the process window of the stacking layer number, thick cells often adopt the technical route of four electrode groups plus four connecting pieces. The connecting piece is in an L shape. First, it needs to be bent by 90° before being welded to the tab of the electrode group. And one connecting piece welds two electrode groups at the same time. After welding, the two electrode groups are folded together to form a whole, and the same is true for the other side. Finally, after the connecting piece is welded to the cover plate, secondary core combination is still needed to combine all four electrode groups together. In this process, the connecting piece needs to be bent by 90° again. There are process defects in such a process. For example, when using an inserting tool to fold and combine the electrode groups, it is very easy to tear the tab. In addition, during the process of bending the connecting piece twice, it is also easy to have problems such as the bending offset of the connecting piece and the insulation failure caused by skewed contact with the shell. Summary of the Invention

[0003] In view of this, the purpose of the present application is to provide a cell cover plate and a cell to solve the problems that the existing cell manufacturing process is prone to tearing the tab when folding and combining the electrode groups, and the connecting piece is prone to bending offset during the bending process of the connecting piece, resulting in insulation failure due to skewed contact with the shell.

[0004] The first aspect of the present invention provides a cell cover plate, wherein the cell cover plate includes:

[0005] A cover plate main body, provided with an installation hole;

[0006] A pole column, passing through the installation hole;

[0007] A connecting piece, arranged on the side of the pole column facing the inside of the cell. The connecting piece includes a connecting main body, a first connecting portion connected to the pole column, and a second connecting portion connected to the tab. The first connecting portion and the second connecting portion are arranged on the same side of the connecting main body in a first direction. A separation groove is arranged between the first connecting portion and the second connecting portion in a second direction. The first direction is perpendicular to the second direction. A fusing protection portion is arranged on the connecting piece, and the first connecting portion and the second connecting portion are connected via the fusing protection portion;

[0008] An insulating member, embedded in the separation groove.

[0009] Preferably, through holes are provided on both the first connecting portion and the fusing protection portion; in the first direction, the distance between the through hole on the fusing protection portion and the through hole on the first connecting portion is Q, and Q≥1.5mm.

[0010] Preferably, a stepped hole having a first stepped portion and a second stepped portion is formed in the first connecting portion. Along the axial direction of the stepped hole, the first stepped portion is disposed on a side of the connecting member away from the cover body;

[0011] The size of the first stepped portion in the first direction is smaller than the size of the second stepped portion in the first direction, and / or the size of the first stepped portion in the second direction is smaller than the size of the second stepped portion in the second direction;

[0012] One end of the pole column facing the inside of the battery cell extends out of the mounting hole, and a first mounting portion mounted on the first stepped portion and a second mounting portion corresponding to the second stepped portion are formed.

[0013] Preferably, the size of the first mounting portion in the first direction or the second direction is d1, the size of the first stepped portion in the first direction or the second direction is D1, and 0.02 mm ≤ (D1 - d1) / 2 ≤ 0.2 mm;

[0014] And / or, the size of the second mounting portion in the first direction or the second direction is d2, the size of the second stepped portion in the first direction or the second direction is D2, and 0.02 mm ≤ (D2 - d2) / 2 ≤ 0.2 mm.

[0015] Preferably, it further includes:

[0016] A sealant, which is clamped between the cover body and the second mounting portion in the thickness direction of the battery cell cover; the size of the circumferential outer wall of the portion of the sealant clamped between the cover body and the second mounting portion in the first direction or the second direction is d3, and 0.5 mm ≤ (d2 - d3) / 2 ≤ 2 mm.

[0017] Preferably, two second connecting portions are provided, the first connecting portion is disposed between the two second connecting portions, and the area of each second connecting portion is S1,

[0018] Preferably, the size of the partition groove in the second direction is P, and 1.5 mm ≤ P ≤ 3 mm.

[0019] Preferably, the thickness of the connecting member is T, and 1 mm ≤ T ≤ 3.5 mm; the size of the insulating member in the thickness direction of the connecting member is H, and 0.5 mm ≤ H - T ≤ 2.5 mm.

[0020] Preferably, the second connecting portion is formed into a sheet-like structure;

[0021] And / or, there are two second connection parts, and the two second connection parts are arranged on both sides of the first connection part in the second direction.

[0022] The second aspect of the present invention provides an electric core, including the electric core cover plate described in any of the above technical solutions.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] In the electric core cover plate of the present invention, the connecting piece is arranged on the side of the pole column facing the inside of the electric core. The connecting piece includes a connecting body, a first connection part connected to the pole column, and a second connection part connected to the pole ear. The first connection part and the second connection part are arranged on the same side of the connecting body in the first direction. The connecting piece is connected to the pole column to form an integral cover plate. The connecting piece on the cover plate is directly connected to the pole ear on the pole group. In this way, the connection between the pole column and the pole ear can be realized without bending the connecting piece, thereby avoiding insulation failure caused by contacting the shell and solving the problem of pole ear tearing caused by core combination. In addition, a fuse protection part is arranged on the connecting piece, and the first connection part and the second connection part are connected through the fuse protection part. When the electric core is out of control due to heat, the fuse protection part can disconnect the connection between the first connection part and the second connection part, so as to play a protective role; a separation groove is arranged between the first connection part and the second connection part in the second direction, and an insulating part is embedded in the separation groove to avoid the situation that the pole ear overlaps with the first connection part after being installed on the second connection part, resulting in the risk of thermal runaway of the electric core during use because the current does not pass through the fuse protection area.

[0025] In order to make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of the electric core cover plate provided by the embodiment of the present invention;

[0028] Figure 2 It is a cross-sectional structural view of the electric core cover plate provided by the embodiment of the present invention;

[0029] Figure 3 For Figure 2 The enlarged structural diagram at A in

[0030] Figure 4Schematic structural diagram of the connecting member in the cell cover plate provided by the embodiment of the present invention;

[0031] Figure 5 Schematic structural diagram of the connecting member in the cell cover plate provided by the embodiment of the present invention from another perspective;

[0032] Figure 6 Is along Figure 5 Cross-sectional view taken along line B-B in

[0033] Figure 7 Schematic structural diagram of the cell cover plate provided by the embodiment of the present invention from another perspective;

[0034] Figure 8 Is along Figure 7 Cross-sectional view taken along line C-C in

[0035] Icon: 10 - cover plate main body; 11 - mounting hole; 20 - pole column; 21 - first mounting part; 22 - second mounting part; 30 - connecting member; 31 - connecting body; 301 - first connecting part; 3001 - first stepped part; 3002 - second stepped part; 302 - second connecting part; 303 - fuse protection part; 304 - partition groove; 40 - insulating part; 50 - sealing part; L1 - first direction; L2 - second direction. Detailed implementation manners

[0036] The following detailed implementation manners are provided to help the reader obtain a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein. Rather, changes that will be apparent after understanding the disclosure of the present application can be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

[0037] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0038] Throughout the specification, when an element (such as, a layer, a region, or a substrate) is described as being “on” another element, “connected to” another element, “coupled to” another element, “above” another element, or “covering” another element, it can be directly “on” the other element, “connected to” the other element, “coupled to” the other element, “above” the other element, or “covering” the other element, or there can be one or more other elements intervening therebetween. In contrast, when an element is described as being “directly on” another element, “directly connected to” another element, “directly coupled to” another element, “directly above” another element, or “directly covering” another element, there can be no other elements intervening therebetween.

[0039] As used herein, the term “and / or” includes any one of the listed related items and any combination of any two or more of them.

[0040] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, elements, regions, layers, or sections, these components, elements, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or section from another. Thus, a first component, element, region, layer, or section described in the examples herein may also be referred to as a second component, element, region, layer, or section without departing from the teachings of the examples.

[0041] For ease of description, spatial relationship terms such as “above,” “upper,” “below,” and “lower” may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element will then be “below” or “lower” relative to the other element. Thus, the term “above” includes both the orientations of “above” and “below” depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relationship terms used herein will be interpreted accordingly.

[0042] The terms used herein are for describing various examples only and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising", "including" and "having" enumerate the stated features, quantities, operations, components, elements and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0043] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0044] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. Moreover, although the examples described herein have various configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application.

[0045] According to a first aspect of the present invention, a cell cover plate is provided, which specifically includes a cover plate body 10, a pole column 20, a connecting member 30, and an insulating member 40.

[0046] Hereinafter, the specific structure of the cell cover plate according to the present embodiment will be described.

[0047] In the present embodiment, as Figure 2 and Figure 3 shown, the cover plate body 10 is provided with a mounting hole 11. The cover plate body 10 is formed into a plate-like structure, and the mounting hole 11 is formed into a through hole penetrating in the thickness direction of the cover plate body 10. The pole column 20 is inserted through the mounting hole 11, and both ends in the axial direction of the pole column 20 extend out of the mounting hole 11 to achieve power transmission.

[0048] In the present embodiment, as Figures 1 to 5As shown, the connecting member 30 is disposed on the side of the pole column 20 facing the inside of the battery cell, and is used to realize the power transmission between the pole column 20 and the tab. The connecting member 30 is formed into a flat sheet structure and remains in a flat structure without bending in the assembled battery cell. Specifically, the connecting member 30 includes a connecting body 31, a first connecting portion 301 connected to the pole column 20, and a second connecting portion 302 connected to the tab. The first connecting portion 301, the second connecting portion 302, and the connecting body 31 are disposed on the same plane. The first connecting portion 301 and the second connecting portion 302 are disposed on the same side of the connecting body 31 in the first direction L1. The connecting body 31 is formed into a strip-shaped sheet structure extending along the second direction L2. The first connecting portion 301 and the second connecting portion 302 are both formed into strip-shaped sheet structures extending along the first direction L1, and their ends in the length direction are connected to the connecting body 31. The connecting member 30 and the pole column 20 are connected to form a cover plate as a whole, and the connecting member 30 on the cover plate is directly connected to the tab on the electrode group. In this way, the connection between the pole column 20 and the tab can be realized without bending the connecting member 30, thereby avoiding insulation failure caused by contact with the case and solving the problem of tab tearing caused by core combination.

[0049] In this embodiment, the first direction L1 is perpendicular to the second direction L2. Preferably, when the cover plate body 10 is a rectangular plate structure, the first direction L1 is the length direction of the cover plate body 10, and the second direction L2 is the width direction of the cover plate body 10.

[0050] Preferably, as Figure 1 , Figures 4 to 6 shown, there are two second connecting portions 302, and the two second connecting portions 302 are disposed on both sides of the first connecting portion 301 in the second direction L2, so that the connecting member 30 is formed into a sheet structure in an E shape to meet the installation requirements of the tabs on the four-electrode group. Correspondingly, there are two separation grooves 304 to separate the two second connecting portions 302 from the first connecting portion 301 respectively.

[0051] As Figures 2 to 6 shown, a fusing protection portion 303 is disposed on the connecting member 30. The first connecting portion 301 and the second connecting portion 302 are connected via the fusing protection portion 303. When the battery cell is in thermal runaway, the fusing protection portion 303 can disconnect the connection between the first connecting portion 301 and the second connecting portion 302, thereby playing a protective role. Especially for battery cells with high safety requirements such as ternary system battery cells or energy storage battery cells, the fusing protection portion 303 can play a reliable protective role during thermal runaway.

[0052] Preferably, in this embodiment, the dimension of the first connecting portion 301 in the second direction L2 is greater than the dimension of the second connecting portion 302 in the second direction L2, and the fusing protection portion 303 is disposed at the end of the first connecting portion 301 connected to the connecting body 31.

[0053] In this embodiment, as Figure 4 and Figure 5 shown, a separation groove 304 is provided between the first connecting portion 301 and the second connecting portion 302 in the second direction L2, and the insulating member 40 is embedded in the separation groove 304. The insulating member 40 can be made of plastic material to prevent the tab from overlapping with the first connecting portion 301 after being mounted on the second connecting portion 302, which may cause the risk of thermal runaway of the battery cell during use due to the current not passing through the fuse protection area.

[0054] In this embodiment, as Figure 5 shown, the separation groove 304 is used to block the connection between the first connecting portion 301 and the second connecting portion 302, so that the fuse protection portion 303 can play an effective safety protection role. The size of the separation groove 304 in the second direction L2 is P, and 1.5 mm ≤ P ≤ 3 mm. In this way, it is ensured that the first connecting portion 301 and the second connecting portion 302 are effectively separated in the second direction L2 to form effective insulation protection, and it can better adapt to the space layout and avoid excessive space occupation.

[0055] Furthermore, in this embodiment, as Figure 7 and Figure 8 shown, the thickness of the connecting member 30 is T, and 1 mm ≤ T ≤ 3.5 mm, to prevent the connecting member 30 with an opening from having insufficient strength due to too small a size of T, and also to prevent the tab from being damaged due to too large a size of T; the size of the insulating member 40 in the thickness direction of the connecting member 30 is H, and 0.5 mm ≤ H - T ≤ 2.5 mm. In this way, it is prevented that the first connecting portion 301 and the second connecting portion 302 have other overlapping situations except through the connection of the fuse protection portion 303, thereby improving the insulation protection effect of the insulating member 40, and also preventing the insulating member 40 from shrinking and deforming during injection molding due to too large a size of H - T, or pressing on the tab to cause the tab to be inserted backward and result in a short circuit.

[0056] In this embodiment, as Figures 4 to 6 shown, through holes are provided on both the first connecting portion 301 and the fuse protection portion 303. The through hole on the fuse protection portion 303 is preferably formed as a long hole extending in the second direction L2 to effectively reduce the connection area between the first connecting portion 301 and the connection main body 31; in the first direction L1, the distance between the through hole on the fuse protection portion 303 and the through hole on the first connecting portion 301 is Q, and Q ≥ 1.5 mm. In this way, it is avoided that the local strength is insufficient due to too small a size of Q, and the first connecting portion 301 and the fuse protection portion 303 are connected and the fuse protection portion 303 fails.

[0057] Furthermore, in this embodiment, as Figures 3 to 6As shown, a stepped hole having a first stepped portion 3001 and a second stepped portion 3002 is formed in the first connecting portion 301. Along the axial direction of the stepped hole, the first stepped portion 3001 is disposed on the side of the connecting member 30 away from the cover plate body 10, and the second stepped portion 3002 is disposed on the side of the connecting member 30 close to the cover plate body 10; the stepped hole may be a circular, polygonal or elliptical hole-shaped structure; in a first alternative embodiment, the size of the first stepped portion 3001 in the first direction L1 is smaller than the size of the second stepped portion 3002 in the first direction L1, and in a second alternative embodiment, the size of the first stepped portion 3001 in the second direction L2 is smaller than the size of the second stepped portion 3002 in the second direction L2; in a third alternative embodiment, the size of the first stepped portion 3001 in the first direction L1 is smaller than the size of the second stepped portion 3002 in the first direction L1 and the size of the first stepped portion 3001 in the second direction L2 is smaller than the size of the second stepped portion 3002 in the second direction L2, such that the aperture of the first stepped portion 3001 is smaller than the aperture of the second stepped portion 3002.

[0058] As Figure 2 and Figure 3 shown, one end of the terminal post 20 facing the inside of the battery cell extends out of the mounting hole 11, and a first mounting portion 21 mounted on the first stepped portion 3001 and a second mounting portion 22 corresponding to the second stepped portion 3002 are formed to form the assembly of the terminal post 20 and the connecting member 30. The shape of the first mounting portion 21 is adapted to the shape of the first stepped portion 3001, and the shape of the second mounting portion 22 is adapted to the shape of the second stepped portion 3002. Preferably, the terminal post 20 and the tab are respectively welded to the connecting member 30. In this embodiment, the second mounting portion 22 is disposed closer to the cover plate body 10 than the first mounting portion 21, and the size of the second mounting portion 22 in the first direction L1 is greater than the size of the first mounting portion 21 in the first direction L1, and / or the size of the second mounting portion 22 in the second direction L2 is greater than the size of the first mounting portion 21 in the second direction L2.

[0059] Furthermore, in this embodiment, as Figure 3 and Figure 5As shown, the dimension of the first mounting portion 21 in the first direction L1 or the second direction L2 is d1 in mm, and the dimension of the first stepped portion 3001 in the first direction L1 or the second direction L2 is D1 in mm, where 0.02 mm ≤ (D1 - d1) / 2 ≤ 0.2 mm. By defining the assembly gap between the first mounting portion 21 and the first stepped portion 3001 in this way, it is avoided that the assembly is difficult due to too small a gap, and it is also avoided that poor soldering (such as virtual soldering) occurs due to too large a gap; and / or, the dimension of the second mounting portion 22 in the first direction L1 or the second direction L2 is d2, and the dimension of the second stepped portion 3002 in the first direction L1 or the second direction L2 is D2, where 0.02 mm ≤ (D2 - d2) / 2 ≤ 0.2 mm. By defining the assembly gap between the second mounting portion 22 and the second stepped portion 3002 in this way, it is avoided that the assembly is difficult due to too small a gap, and it is also avoided that the assembly positioning is affected due to too large a gap, resulting in eccentricity, which will affect the assembly of the entire battery cell cover plate.

[0060] In addition, in this embodiment, as Figure 2 and Figure 3 shown, the battery cell cover plate further includes a seal 50. The seal 50 is an annular sealing ring sleeved on the pole post 20. In the thickness direction of the battery cell cover plate, the seal 50 is clamped between the cover plate main body 10 and the second mounting portion 22 to ensure the sealing performance of the battery cell cover plate; the outer circumferential wall dimension of the part of the seal 50 clamped between the cover plate main body 10 and the second mounting portion 22 in the first direction L1 or the second direction L2 is d3, where 0.5 mm ≤ (d2 - d3) / 2 ≤ 2 mm. In this way, it is ensured that the second mounting portion 22 can effectively press the seal 50 against the surface of the cover plate main body 10 to effectively support the seal 50, preventing the bottom of the connecting member 30 and the pole post 20 from being poorly sealed, and also avoiding occupying too much space in the width direction of the battery cell cover plate, resulting in increased costs and excessive materials.

[0061] In this embodiment, as Figure 4 shown, there are two second connecting portions 302, and the first connecting portion 301 is arranged between the two second connecting portions 302. The area of each second connecting portion 302 is S1. In this way, it is ensured that there is enough area on both sides of the second connecting portion 302 for welding the pole ears, ensuring the current-carrying capacity, and avoiding the local temperature of the second connecting portion 302 being too high during the use of the battery cell due to insufficient welding area, which affects the performance of the battery cell.

[0062] It should be noted that in this embodiment, there is one pole post 20 or multiple pole posts 20 provided on the battery cell cover plate. Preferably, when there are multiple pole posts 20, the connecting member 30 and the pole posts 20 are arranged in one-to-one correspondence.

[0063] The following is to assemble cell covers with different size parameters Q, (D1 - d1) / 2, (d2 - d3) / 2, P, and H - T into cells, and then test the assembled cells. The test results are shown in Table 1 below. The units of all parameters in Table 1 are mm.

[0064] Table 1

[0065]

[0066] According to the present invention, a connecting member in a cell cover is arranged on the side of the pole column facing the inside of the cell. The connecting member includes a connecting body, a first connecting portion connected to the pole column, and a second connecting portion connected to the pole ear. The first connecting portion and the second connecting portion are arranged on the same side of the connecting body in the first direction. The connecting member is connected to the pole column to form a whole cover plate, and the connecting member on the cover plate is directly connected to the pole ear on the pole group. In this way, the connection between the pole column and the pole ear can be realized without bending the connecting member, thereby avoiding insulation failure caused by contacting the shell and solving the problem of pole ear tearing caused by core combination. In addition, a fusing protection portion is arranged on the connecting member. The first connecting portion and the second connecting portion are connected via the fusing protection portion. When the cell is in thermal runaway, the fusing protection portion can disconnect the connection between the first connecting portion and the second connecting portion, thereby playing a protective role. A separation groove is arranged between the first connecting portion and the second connecting portion in the second direction, and an insulating member is embedded in the separation groove to prevent the situation that the pole ear is installed on the second connecting portion and overlaps with the first connecting portion, resulting in the risk of thermal runaway of the cell because the current does not pass through the fusing protection area during the use of the cell.

[0067] According to the present invention, a cell includes the cell cover plate as described above, and thus has all the beneficial effects of the cell cover plate, which will not be elaborated here.

[0068] Finally, it should be noted that the above - described embodiments are only specific embodiments of the present application, used to illustrate the technical solutions of the present application, rather than limiting them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present application can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery cell cover, characterized in that: The battery cover plate comprises: The cover plate body is provided with a mounting hole; A pole, passing through the mounting hole; A connector, arranged on a side of the pole facing the inside of the battery cell, the connector comprising a connecting body, a first connecting portion connected to the pole, and a second connecting portion connected to the pole lug, the first connecting portion and the second connecting portion are arranged on the same side of the connecting body in a first direction, a separation groove is arranged between the first connecting portion and the second connecting portion in a second direction, the first direction is perpendicular to the second direction, a fuse protection portion is arranged on the connector, and the first connecting portion and the second connecting portion are connected via the fuse protection portion; The insulating member is embedded in the separation groove.

2. The cell cover plate according to claim 1, characterized in that: The first connection portion and the fuse protection portion are both provided with through holes; in a first direction, a distance between the through hole on the fuse protection portion and the through hole on the first connection portion is Q, and Q is ≥ 1.5 mm.

3. The cell cover plate according to claim 1, characterized in that: The first connecting portion is provided with a stepped hole having a first stepped portion and a second stepped portion, and along the axial direction of the stepped hole, the first stepped portion is arranged on a side of the connecting member away from the cover plate body; The size of the first step portion in the first direction is smaller than the size of the second step portion in the first direction, and / or the size of the first step portion in the second direction is smaller than the size of the second step portion in the second direction; One end of the pole facing the inside of the battery cell extends out of the mounting hole, and is formed with a first mounting portion mounted on the first step portion and a second mounting portion mounted on the second step portion.

4. The cell cover plate according to claim 3, characterized in that: The dimension of the first mounting portion in the first direction or the second direction is d1, the dimension of the first step portion in the first direction or the second direction is D1, 0.02 mm ≤ (D1-d1) / 2 ≤ 0.2 mm; And / or, a dimension of the second mounting portion in the first direction or the second direction is d2, a dimension of the second step portion in the first direction or the second direction is D2, and 0.02 mm ≤ (D2-d2) / 2 ≤ 0.2 mm.

5. The cell cover plate according to claim 4, characterized in that: Also includes: A sealing member is sandwiched between the cover body and the second mounting portion in the thickness direction of the battery cell cover; a dimension of the peripheral outer wall of the portion of the sealing member sandwiched between the cover body and the second mounting portion in the first direction or the second direction is d3, 0.5mm≤(d2-d3) / 2≤2mm.

6. The cell cover plate according to claim 4, characterized in that: There are two second connection parts, the first connection part is arranged between the two second connection parts, and the area of ​​each second connection part is S1.

7. The cell cover plate according to claim 1, characterized in that: The dimension of the separation groove in the second direction is P, 1.5 mm≤P≤3 mm.

8. The cell cover plate according to claim 1, characterized in that: The thickness of the connecting piece is T, 1mm≤T≤3.5mm; the dimension of the insulating piece in the thickness direction of the connecting piece is H, 0.5mm≤HT≤2.5mm.

9. The cell cover plate according to claim 1, characterized in that: The second connecting portion is formed into a sheet-like structure; And / or, two second connection parts are provided, and the two second connection parts are provided on both sides of the first connection part in the second direction.

10. A battery cell, characterized in that: The invention comprises the battery cell cover plate according to any one of claims 1 to 9.

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