Cover plate and battery

Abstract

This application relates to the field of battery technology and discloses a cover plate and a battery. The cover plate is used for sealing connection to a battery casing. The cover plate includes: a plate body, a sealing block, and a locking member. Specifically, the plate body has a connecting groove, and the bottom of the connecting groove has an injection hole communicating with the inside of the battery casing. A locking cavity is provided in the plate body, and the locking cavity communicates with the connecting groove. The sealing block is at least partially disposed in the connecting groove for sealing the injection hole. The locking member includes a pressing part and a locking part connected to each other. The pressing part is disposed in the connecting groove and abuts against the sealing block. The locking part extends into the locking cavity, and the locking part and the locking cavity are interference-fitted. The cover plate and battery disclosed in this application solve or improve the problems of complex sealing process and poor sealing effect of the injection hole.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to cover plates and batteries. Background Technology

[0002] Battery covers typically have injection holes for electrolyte injection. During battery production, sealing pins are welded to the injection holes on the cover body to seal them, serving as the final step in the battery assembly process and achieving internal sealing of the battery.

[0003] In related technologies, circular cap-shaped aluminum sealing nails are typically used for laser welding to seal the injection hole, thereby isolating the battery cell from the external environment and forming a sealed electrochemical system inside the battery. Therefore, the yield of sealing nail welding significantly affects the overall production yield and cost of the battery.

[0004] The effectiveness of laser welding is affected by factors such as the cleanliness of the injection port, laser parameters, and the shape of the sealing nail, which can easily lead to problems such as cracks, explosions, and pinholes at the weld (sealing point), thus affecting the reliability and safety of the entire battery. Utility Model Content

[0005] In view of this, this application provides a cover plate to solve or improve the problems of complex sealing process and poor sealing effect of injection hole.

[0006] In a first aspect, this application provides a cover plate for sealingly connecting to a battery casing, comprising: The plate body has a connecting groove, and the bottom of the connecting groove has a liquid injection hole that communicates with the inside of the battery casing. The plate body has a locking cavity that communicates with the connecting groove. A sealing block, at least partially disposed within the connecting groove, for sealing the injection hole; A locking member, comprising a pressing part and a locking part connected to each other, the pressing part being disposed in the connecting groove and abutting against the sealing block, the locking part extending into the locking cavity, the locking part being interference-fitted with the locking cavity.

[0007] In this embodiment, electrolyte is injected into the battery casing through the injection hole. After the electrolyte injection is completed, a sealing block is placed in the connecting groove to seal the injection hole at the bottom of the connecting groove. The sealing block is sealed to the inner wall of the connecting groove. A locking member is inserted from the opening of the connecting groove. During the process of entering the connecting groove, one end of the locking part passes through the connecting groove into the locking cavity and is interference-fitted with the locking cavity to fix the locking part in the locking cavity. At the same time, there is pressure between the squeezing part and the sealing block, which can squeeze the sealing block into the connecting groove, improving the sealing effect of the sealing block on the injection hole. The interference fit between the locking part and the locking cavity restricts the movement of the squeezing part, so that the squeezing part can continuously apply pressure to the sealing block, fixing the entire locking member in the connecting groove. This simplifies the sealing process of the injection hole and improves the sealing effect.

[0008] In one alternative embodiment, the plate body is provided with a guide portion, the guide portion being located on the side of the locking cavity near the connecting groove, and the locking portion being guided to extend into the locking cavity through the guide portion.

[0009] In one optional embodiment, the guide portion is provided with a guide surface, which smoothly transitions to the inner wall surface of the locking cavity near the injection hole, and the guide surface is adapted to guide the locking portion into the locking cavity.

[0010] In one optional embodiment, along a first direction, the connecting groove is sequentially configured with a compression area and a sealing area, the sealing block is at least partially disposed in the sealing area, and the end face of the compression part facing the sealing block is provided with a first protrusion, the first protrusion extending to the sealing area and abutting against the sealing block. Wherein, the first direction is parallel to the axial direction of the injection hole.

[0011] In one optional embodiment, the locking cavity is an annular cavity disposed on the periphery of the connecting groove, and multiple locking parts are provided, with the multiple locking parts disposed on the periphery of the pressing part.

[0012] In one optional embodiment, the longitudinal section of the wall of the locking cavity is arc-shaped. Along the second direction, the locking cavity is sequentially configured as an inlet section, a bending section, and a locking section. The inlet section communicates with the connecting groove, wherein the second direction intersects with the first direction. Along the first direction, the distance between the side of the inlet section away from the injection hole and the end face of the plate body is H1, the distance between the side of the bend section away from the injection hole and the end face of the plate body is H2, and the distance between the side of the locking section away from the injection hole and the end face of the plate body is H3, wherein H1 and H3 are both less than H2.

[0013] In one optional embodiment, the inner wall of the connecting groove in the extrusion zone is a connecting wall, the connecting wall narrows along a first direction, and the outer wall of the extrusion part is adapted to the connecting wall.

[0014] In one optional embodiment, the guide portion is provided with a rounded corner surface on the side away from the locking cavity, and the rounded corner surface is smoothly connected to the guide surface; And / or, the guide surface is inclined downward in the direction close to the locking cavity.

[0015] In one alternative embodiment, the locking part is a flexible structure.

[0016] In one alternative embodiment, the locking element is made of metal.

[0017] In one alternative embodiment, the sealing block is interference-fitted with the connecting groove.

[0018] Secondly, this application provides a battery including a housing, a battery cell, and the aforementioned cover plate. The housing has an opening, the battery cell is disposed inside the housing, and the cover plate covers the opening and is sealed to the housing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a partial cross-sectional view of a cover plate with the sealing block and locking element removed, according to an embodiment of this application. Figure 2 for Figure 1 A magnified view of part A in the diagram; Figure 3 This is a partial cross-sectional view of a cover plate according to an embodiment of this application; Figure 4 A partial cross-sectional view of another cover plate according to an embodiment of this application, with the sealing block and locking element removed; Figure 5 This is a structural schematic diagram of a cover plate in which a locking member is installed in a connecting groove, according to an embodiment of this application. Figure 6 This is a structural schematic diagram of a cover plate in which the locking element is not installed in the connecting groove, according to an embodiment of this application.

[0021] Explanation of reference numerals in the attached figures: 1. Plate body; 101. Connecting groove; 1011. Extrusion zone; 1012. Sealing zone; 102. Injection hole; 103. Locking cavity; 1031. Inlet section; 1032. Bending section; 1033. Locking section; 104. Connecting wall; 2. Sealing block; 3. Locking component; 301. Extrusion part; 302. Locking part; 303. First protrusion; 4. Guide part; 401. Guide surface; 402. Rounded corner surface; X, First direction; Y, Second direction. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] Battery covers typically have injection holes for electrolyte injection. During battery production, sealing pins are welded to the injection holes on the cover body to seal them, serving as the final step in the battery assembly process and achieving internal sealing of the battery.

[0026] In related technologies, circular cap-shaped aluminum sealing nails are typically used for laser welding to seal the injection hole, thereby isolating the battery cell from the external environment and forming a sealed electrochemical system inside the battery. Therefore, the yield of sealing nail welding significantly affects the overall production yield and cost of the battery.

[0027] However, the effectiveness of laser welding is affected by factors such as the cleanliness of the injection port, laser parameters, and the shape of the sealing pin, which can easily lead to problems such as cracks, spalling, and pinholes at the weld (sealing point). Furthermore, cracks may also develop inside the sealing pin after welding, thus affecting the overall reliability and safety of the battery. Therefore, this application provides a cover plate to solve or improve the problems of complex sealing processes and poor sealing effects at the injection port.

[0028] The following is combined with Figures 1 to 6 This describes an embodiment of the present application.

[0029] According to embodiments of this application, such as Figures 1 to 4 As shown, a cover plate is provided, which is sealed to the battery housing. The cover plate includes: a plate body 1, a sealing block 2, and a locking member 3. Specifically, the plate body 1 has a connecting groove 101, and the bottom of the connecting groove 101 has a liquid injection hole 102 that communicates with the inside of the battery housing. The plate body 1 has a locking cavity 103 that communicates with the connecting groove 101. The sealing block 2 is at least partially disposed in the connecting groove 101 for sealing the liquid injection hole 102. The locking member 3 includes a pressing part 301 and a locking part 302 connected to each other. The pressing part 301 is disposed in the connecting groove 101 and abuts against the sealing block 2. The locking part 302 extends into the locking cavity 103 and is interference-fitted with the locking cavity 103.

[0030] In this embodiment, such as Figures 1 to 4As shown, an opening is provided on one side of the battery casing. The plate body 1 is sealed to the opening. Electrolyte is injected into the battery casing through the injection hole 102. After the electrolyte injection is completed, the sealing block 2 is placed in the connecting groove 101 to block the injection hole 102 at the bottom of the connecting groove 101. The sealing block 2 is sealed to the inner wall of the connecting groove 101. The locking member 3 is inserted from the groove opening of the connecting groove 101. During the process of the locking member 3 entering the connecting groove 101, one end of the locking part 302 passes through the connecting groove 101 into the locking cavity 103 and engages with the locking cavity. An interference fit 103 fixes the locking part 302 within the locking cavity 103. Simultaneously, pressure exists between the squeezing part 301 and the sealing block 2, pressing the sealing block 2 into the connecting groove 101, improving the sealing effect of the sealing block 2 on the injection hole 102. The locking part 302 is fixedly connected to the locking cavity 103, thus restricting the movement of the squeezing part 301. This allows the squeezing part 301 to continuously apply pressure to the sealing block 2, fixing the entire locking component 3 within the connecting groove 101. This simplifies the sealing process of the injection hole 102 and improves the sealing effect. In other embodiments, the battery casing may have openings on both sides. The plate body 1 seals one opening, and the other opening can be sealed using other cover plate structures, or both openings can be sealed using the plate body 1. Furthermore, in other embodiments, the sealing block 2 may be partially located within the connecting groove 101, partially extending into the injection hole, or partially extending through the injection hole into the casing.

[0031] In one embodiment, such as Figure 1 As shown, a guide part 4 is provided inside the plate body 1. The guide part 4 is located on the side of the locking cavity 103 near the connecting groove 101. The locking part 302 is guided to extend into the locking cavity 103 through the guide part 4.

[0032] In this embodiment, such as Figure 1 As shown, the locking part 302 enters the locking cavity 103 through the guide part 4, that is, the guide part 4 can guide the locking part 302 and improve the efficiency of the installation of the locking part 302.

[0033] In one embodiment, such as Figures 1 to 3 As shown, the guide part 4 is provided with a guide surface 401, which is smoothly connected to the inner wall surface of the locking cavity 103 near the injection hole 102. The guide surface 401 is suitable for guiding the locking part 302 into the locking cavity 103.

[0034] In this embodiment, such as Figures 1 to 3As shown, when the locking member 3 is inserted into the connecting groove 101, the end of the locking part 302 away from the squeezing part 301 abuts against the guide surface 401 of the guide part 4. As the depth of the locking member 3 inserted into the connecting groove 101 increases, the locking part 302 slides along the guide surface 401. The guide surface 401 can guide the locking part 302 of the locking member 3 into the locking cavity 103 and insert it into the locking cavity 103. The locking part 302 and the locking cavity 103 are interference fit, which can lock the locking part 302 in the locking cavity 103. At the same time, the squeezing part 301 squeezes the sealing block 2, increasing the pressure between the sealing block 2 and the connecting groove 101, thereby improving the sealing effect of the sealing block 2 on the injection hole 102.

[0035] In one embodiment, such as Figures 1 to 3 As shown, along the first direction X, the connecting groove 101 is sequentially configured with a squeezing area 1011 and a sealing area 1012. The sealing block 2 is at least partially disposed in the sealing area 1012. The squeezing part 301 is provided with a first protrusion 303 on its end face facing the sealing block 2. The first protrusion 303 extends to the sealing area 1012 and abuts against the sealing block 2. The first direction X is parallel to the axial direction of the injection hole 102.

[0036] In this embodiment, such as Figures 1 to 3 As shown, the guide part 4 is located at the junction of the extrusion area 1011 and the sealing area 1012. The locking part 302 first contacts the guide surface 401 of the guide part 4. As the locking member 3 enters the connecting groove 101 to a greater depth, the locking part 302 continuously enters the interior of the locking cavity 103. When the locking part 302 is fully inside the locking cavity 103, the first protrusion 303 of the extrusion part 301 enters the sealing area 1012 and is squeezed against the sealing block 2.

[0037] In one embodiment, the sealing block 2 is interference-fitted with the connecting groove 101 to improve the sealing effect.

[0038] In one embodiment, such as Figures 4 to 6 As shown, the locking cavity 103 is an annular cavity, which is disposed on the periphery of the connecting groove 101. Multiple locking parts 302 are provided, and multiple locking parts 302 are disposed on the periphery of the pressing part 301.

[0039] In this embodiment, such as Figures 3 to 6 As shown, multiple locking parts 302 are disposed around the periphery of the extrusion part 301 and extend along the first direction X, and are inclined away from the extrusion part 301 to facilitate contact with the guide surface 401 of the guide part 4. The locking parts 302 are introduced into the locking cavity 103. The multiple locking parts 302 are interference-fitted with the locking cavity 103, which can increase the connection strength between the extrusion part 301 and the connecting groove 101. The locking cavity 103 is an annular cavity, which is more convenient to process and can accommodate any number of locking parts 302.

[0040] In some embodiments, such as Figure 4 As shown, the guide part 4 has an annular structure that fits into the annular cavity, and multiple locking parts 302 can be inserted into the locking cavity 103 from any angle. It should be noted that after the position of the locking part 302 in the first direction X is determined, it can be rotated at any angle to be inserted into the locking cavity 103.

[0041] In a specific implementation, such as Figures 5 to 6 As shown, three locking parts 302 are provided. The three locking parts 302 are arranged at equal angles along the periphery of the pressing part 301. The three locking parts 302 simultaneously enter the locking cavity 103 and lock the pressing part 301 in the connecting groove 101.

[0042] In one embodiment, such as Figure 1 As shown, the longitudinal section of the wall of the locking cavity 103 is arc-shaped. Along the second direction Y, the locking cavity 103 is sequentially configured as an inlet section 1031, a bending section 1032 and a locking section 1033. The inlet section 1031 is connected to the connecting groove 101. The second direction Y intersects with the first direction X. Along the first direction X, the distance between the side of the inlet section 1031 away from the injection hole 102 and the end face of the plate body 1 is H1; the distance between the side of the bending section 1032 away from the injection hole 102 and the end face of the plate body 1 is H2; and the distance between the side of the locking section 1033 away from the injection hole 102 and the end face of the plate body 1 is H3. Both H1 and H3 are less than H2. However, there are no restrictions on the relationship between H1 and H3; H1 can be no less than H3, and H3 can be greater than H1.

[0043] In this embodiment, such as Figure 1 As shown, the longitudinal section of the annular cavity is banana-shaped, with both ends bending towards the middle. The inlet section 1031 is connected to the connecting groove 101. The locking part 302 enters the inlet section 1031 through the guide part 4, continues to extend downward along the inlet section 1031, enters the bending section 1032, continues to extend along the bending section 1032, and finally enters the locking section 1033. The locking part 302 continues to extend in the locking cavity 103, so that the locking part 302 is bent into a hook-like structure, which improves the connection strength between the locking part 302 and the locking cavity 103. It should be noted that the locking part 302 is interference-fitted with the inlet section 1031, the bending section 1032 and the locking section 1033. H1 and H3 are both smaller than H2, which allows the locking part 302 to be bent into a hook-like structure.

[0044] In one embodiment, such as Figure 3 As shown, the locking part 302 is a flexible structure; for example, a rubber sheet or other elastic structure, or a metal with low hardness such as aluminum or aluminum alloy.

[0045] In this embodiment, such as Figure 3 As shown, the locking part 302 is deformed to fit the shape of the locking cavity 103, and the locking part 302 is bent into a hook-lock shape to increase the connection strength with the locking cavity 103. Before assembly, the structure of the locking part 3 is as follows. Figure 6 As shown, the structure of the assembled and deformed locking component 3 is as follows: Figure 5 As shown.

[0046] In one embodiment, such as Figure 1 As shown, the inner wall of the connecting groove 101 in the extrusion zone 1011 is the connecting wall 104. The connecting wall 104 narrows along the first direction X, and the outer wall of the extrusion section 301 is adapted to the connecting wall 104.

[0047] In this embodiment, such as Figure 1 As shown, the connecting wall 104 of the connecting groove 101 narrows from the groove opening to the bottom of the groove, which reduces the difficulty of inserting the locking member 3 into the connecting groove 101 during the process of inserting the locking member 3 into the connecting groove 101.

[0048] In one embodiment, such as Figure 2 As shown, a rounded corner surface 402 is provided on the side of the guide portion 4 away from the locking cavity 103, and the rounded corner surface 402 is smoothly connected to the guide surface 401; and / or, the guide surface 401 is inclined downward in the direction close to the locking cavity 103.

[0049] In this embodiment, such as Figure 2 As shown, the end of the locking part 302 furthest from the pressing part 301 first contacts the rounded corner surface 402, reducing friction between the locking part 302 and the guide part 4. This prevents the locking part 302 from abutting against the guide part 4, causing jamming and preventing the locking part 302 from entering the locking cavity 103. At the same time, the rounded corner surface 402 guides the locking part 302 to the guide surface 401, allowing the locking part 302 to be inserted into the locking cavity 103 along the guide surface 401, thereby improving installation efficiency.

[0050] Specifically, such as Figure 2 As shown, the guide part 4 is provided on the groove wall corresponding to the sealing area 1012.

[0051] In one embodiment, the locking element 3 is made of metal. Using metal provides the locking element 3 with higher structural strength.

[0052] In this embodiment, the locking part 3 is integrally formed from aluminum or aluminum alloy. Compared with other metals, aluminum alloy is softer, and the locking part 302 can easily deform and enter the locking cavity 103. Specifically, the integral forming process includes casting, forging, die stamping, metal injection molding and 3D printing.

[0053] In other embodiments, the locking element 3 may also be made of materials such as rubber or plastic.

[0054] Secondly, this application provides a battery, including a casing, a battery cell, and the aforementioned cover plate. The casing has an opening, the battery cell is disposed inside the casing, and the cover plate covers the opening and is sealed to the casing. The casing may have an opening on one side, with the cover plate sealingly connected to the opening; the casing may also have openings on both sides, with the aforementioned cover plate sealingly connected to one opening and the other opening sealed using a different cover plate structure; or both openings may be sealed using the aforementioned cover plate.

[0055] It should be noted that the battery includes the cover plate provided in the embodiments of this application, and therefore includes all the advantages of the cover plate mentioned above, so it will not be described again.

[0056] The following is an example, combined with Figures 1 to 6 A comprehensive explanation of all the above-mentioned plans is provided.

[0057] An opening is provided on one side of the battery casing. The plate body 1 is sealed and connected to the battery mounting port. Electrolyte is injected into the battery casing through the injection hole 102. After the electrolyte injection is completed, the sealing block 2 is placed in the sealing area 1012 in the connecting groove 101 to block the injection hole 102 at the bottom of the connecting groove 101. The locking member 3 is inserted into the connecting groove 101. The locking part 302 enters the connecting groove 101 first. The locking part 302 is inclined outward, so the locking part 302 first contacts the rounded corner surface 402 and then slides down to the guide surface. 401. The locking part 302 slides against the guide surface 401. Then, after the locking part 302 passes through the guide surface 401 and enters the inlet section 1031, the locking part 302 continues to extend along the locking cavity 103 to the bending section 1032. At this time, the locking part 302 undergoes obvious deformation, that is, it gradually bends upward. Later, the locking part 302 reaches the locking section 1033, which is the end point of the locking cavity 103. At this time, the locking part 302 is in the shape of a hook and is interference-fitted with the locking cavity 103 to achieve a fixed connection.

[0058] At this time, the first protrusion 303 of the extrusion part 301 presses against the sealing block 2, which can press the sealing block 2 tightly in the sealing area 1012. The sealing block 2 can be an elastic block, specifically a rubber block. The first protrusion 303 extrudes the rubber block to deform it. The deformed rubber block fits more tightly with the groove wall of the connecting groove 101, further improving the sealing effect on the injection hole 102.

[0059] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended application.

Claims

1. A cover plate for sealingly connecting to a battery casing, characterized in that, include: The plate body (1) has a connecting groove (101) on it. The bottom of the connecting groove (101) has an injection hole (102) that communicates with the inside of the battery casing. The plate body (1) has a locking cavity (103) inside it, and the locking cavity (103) communicates with the connecting groove (101). A sealing block (2) is at least partially disposed in the connecting groove (101) for sealing the injection hole (102). The locking member (3) includes a pressing part (301) and a locking part (302) connected to each other. The pressing part (301) is disposed in the connecting groove (101) and abuts against the sealing block (2). The locking part (302) extends into the locking cavity (103) and is interference-fitted with the locking cavity (103).

2. The cover plate according to claim 1, characterized in that, The plate body (1) is provided with a guide part (4), the guide part (4) is located on the side of the locking cavity (103) near the connecting groove (101), and the locking part (302) is guided to extend into the locking cavity (103) through the guide part (4).

3. The cover plate according to claim 2, characterized in that, The guide part (4) is provided with a guide surface (401), which is smoothly connected to the inner wall surface of the locking cavity (103) near the injection hole (102). The guide surface (401) is adapted to guide the locking part (302) into the locking cavity (103).

4. The cover plate according to claim 1, characterized in that, Along the first direction (X), the connecting groove (101) is sequentially configured with a pressing area (1011) and a sealing area (1012). The sealing block (2) is at least partially disposed in the sealing area (1012). The pressing part (301) has a first protrusion (303) on its end face facing the sealing block (2). The first protrusion (303) extends to the sealing area (1012) and abuts against the sealing block (2). The first direction (X) is parallel to the axial direction of the injection hole (102).

5. The cover plate according to claim 1, characterized in that, The locking cavity (103) is an annular cavity, which is disposed on the periphery of the connecting groove (101). Multiple locking parts (302) are provided, and multiple locking parts (302) are disposed on the periphery of the pressing part (301).

6. The cover plate according to claim 4, characterized in that, The longitudinal section of the wall of the locking cavity (103) is arc-shaped. Along the second direction (Y), the locking cavity (103) is sequentially configured as an inlet section (1031), a bending section (1032) and a locking section (1033). The inlet section (1031) is connected to the connecting groove (101). The second direction (Y) intersects with the first direction (X). Along the first direction (X), the distance between the side of the inlet section (1031) away from the injection hole (102) and the end face of the plate body (1) is H1, the distance between the side of the bend section (1032) away from the injection hole (102) and the end face of the plate body (1) is H2, and the distance between the side of the locking section (1033) away from the injection hole (102) and the end face of the plate body (1) is H3, wherein H1 and H3 are both less than H2.

7. The cover plate according to claim 4, characterized in that, The inner wall of the connecting groove (101) in the extrusion zone (1011) is the connecting wall (104), which narrows along the first direction (X). The outer wall of the extrusion part (301) is adapted to the connecting wall (104).

8. The cover plate according to claim 3, characterized in that, The guide portion (4) is provided with a rounded corner surface (402) on the side away from the locking cavity (103), and the rounded corner surface (402) is smoothly connected to the guide surface (401); And / or, the guide surface (401) is inclined downward in the direction close to the locking cavity (103).

9. The cover plate according to any one of claims 1 to 8, characterized in that, The locking part (302) is a flexible structure; And / or, the locking element (3) is made of metal; And / or, the sealing block (2) is interference-fitted with the connecting groove (101).

10. A battery, characterized in that, The device includes a housing, a battery cell, and a cover plate as described in any one of claims 1 to 9, wherein the housing has an opening, the battery cell is disposed inside the housing, and the cover plate covers the opening and is sealed to the housing.

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