Battery cover assembly and battery

Abstract

This invention provides a battery cover assembly and a battery, relating to the field of battery technology. The battery cover assembly includes a cover plate, terminals, and a fixing plate. The cover plate has terminal mounting holes. The fixing plate is located on the inner side of the cover plate near the battery cell and is connected to the cover plate. The terminals pass through the terminal mounting holes, and the fixing plate defines the position of the terminals relative to the cover plate. Each terminal has a tab connection portion formed on the inner side of the cover plate, which is used for welding to the tabs of the battery cell. This invention can simultaneously address the need to reduce the exposed height of the terminals and reduce internal resistance, improve space utilization, and reduce welding processes, thereby improving battery performance.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically, to a battery cover assembly and a battery. Background Technology

[0002] Batteries are widely used in power tools and new energy vehicles. For example, the power battery of a new energy vehicle consists of several individual cells. A single cell generally includes a casing, a cell, and a cover assembly. The casing houses the cell, and the cover assembly includes a cover plate and terminals. The cover plate is placed over the opening of the casing and has through holes. The terminals pass through these through holes and are connected to connecting blocks located on the outside of the cover plate, for example, by welding, to fix their position at the through holes. In this case, the end of the terminal closer to the cell is connected to the cell's tab via a connecting piece, while the end of the terminal further away from the cell needs to extend beyond the connecting block to allow for subsequent electrical connection to external components of the single cell, such as welding the terminals of multiple single cells to the busbar of the power battery.

[0003] However, in this case, the end of the terminal post furthest from the cell will extend significantly beyond the end face of the cover plate, requiring a higher terminal post height. Furthermore, the connecting tabs also occupy considerable space, ultimately reducing the battery's space utilization and energy density. Additionally, the current flow path from the cell to the terminal post needs to pass through multiple welding areas. Firstly, the current must pass through the welding areas of the connecting tabs and the electrode tabs, and also the welding area between the connecting tabs and the terminal post, resulting in relatively high internal resistance and affecting battery performance. Secondly, the multiple welding processes are complex and increase production costs. Summary of the Invention

[0004] The present invention aims to address, to some extent, the problem in related technologies of how to design the structure of battery cover assembly to balance the need to reduce the exposed height of the terminals and the need to reduce internal resistance, thereby improving battery performance.

[0005] To at least partially address at least one aspect of the aforementioned problems, in a first aspect, the present invention provides a battery cover assembly, including a cover plate, a terminal post, and a fixing plate; the cover plate is provided with a terminal post mounting hole, the fixing plate is located on the inner side of the cover plate near the battery cell and connected to the cover plate, the terminal post passes through the terminal post mounting hole, and the fixing plate defines the position of the terminal post relative to the cover plate; the terminal post forms a tab connection portion on the inner side of the cover plate, the tab connection portion being used for welding connection with the tab of the battery cell.

[0006] Optionally, the electrode post includes a column and a stop structure located at one end of the column near the cell. The cross-sectional area of ​​the column is less than or equal to the cross-sectional area of ​​the electrode post mounting hole, and the cross-sectional area of ​​the stop structure is greater than the cross-sectional area of ​​the electrode post mounting hole. The tab connection portion is disposed at one circumferential end of the stop structure.

[0007] The fixing plate includes a plate body and a connecting portion. The plate body is at least partially located on the side of the stop structure away from the cover plate. The connecting portion is located in one or more circumferential directions of the plate body and extends toward the side closer to the cover plate and connects to the cover plate.

[0008] Optionally, the end of the connecting portion away from the plate has an outwardly folded edge, which is attached to and welded to the cover plate;

[0009] And / or, along the circumference of the plate, a plurality of ends of the plate are provided with the connecting portion; wherein, the connecting portions of at least two of the ends are spaced apart, and / or, the plurality of ends include at least two setting ends, the setting end being different from the end of the electrode tab connecting portion relative to the plate when the electrode post passes through the electrode post mounting hole, and the connecting portions of at least two of the setting ends are connected as a whole in the circumference of the plate.

[0010] Optionally, the battery cover assembly further includes an insulating structure; the insulating structure includes one or more of a first insulating structure, a second insulating structure, and a third insulating structure;

[0011] The first insulating structure is disposed on the inner side of the cover plate and separates the cover plate and the battery cell; the connecting part passes through the first insulating structure and is welded to the cover plate.

[0012] The second insulating structure is located on the outer periphery of the column and between the column and the pole mounting hole;

[0013] The third insulating structure is at least partially located on the side of the stop structure away from the cover plate and is located between the plate and the stop structure.

[0014] Optionally, the first insulating structure forms a first through hole communicating with the pole mounting hole, and the pole body passes through the first through hole;

[0015] The side of the first insulating structure away from the cover plate has a receiving space that communicates with the first through hole. When the pole is installed at the pole mounting hole, the end faces of the pole and the fixing plate away from the cover plate are both located in the receiving space.

[0016] And / or, a limiting groove communicating with the first through hole is formed on the side of the first insulating structure away from the cover plate, the stop structure and / or the electrode connecting part is accommodated in the limiting groove, and the limiting groove restricts the displacement of the stop structure and / or the electrode connecting part in at least one circumferential direction; when the first insulating structure has the accommodating space and the limiting groove, the limiting groove is in communication with the accommodating space.

[0017] Optionally, the battery cover assembly further includes a seal that is disposed around the post and forms a seal against the terminal mounting hole;

[0018] The seal is also used to form the second insulation structure; and / or, the seal is at least partially located between the end face of the pole mounting hole and the stop structure.

[0019] Optionally, a portion of the third insulating structure is located on the side of the stop structure near the cover plate, and the third insulating structure forms a cavity;

[0020] The stop structure is at least partially embedded in the cavity, or the third insulating structure and the pole are connected to form an integral structure, or the third insulating structure, the second insulating structure and the pole are connected to form an integral structure.

[0021] Optionally, the cover plate has a recessed groove formed on its inner side;

[0022] The sinker includes a first sinker, which is connected to the pole mounting hole. The first sinker is provided corresponding to the stop structure, and the cross-sectional area of ​​the first sinker is greater than or equal to the cross-sectional area of ​​the stop structure.

[0023] And / or, the sink includes a second sink, the end of the connector near the cover is accommodated in the second sink, and the connector is connected to the cover at the second sink;

[0024] When the settling tank includes the first settling tank and the second settling tank, the second settling tank is located circumferentially outside the first settling tank, and the second settling tank is connected to or spaced apart from the first settling tank.

[0025] Optionally, the electrode post is a stamped part; and / or, the electrode post is formed with a weight-reducing groove, the opening of the weight-reducing groove being disposed facing the battery cell.

[0026] In a second aspect, the present invention provides a battery including the battery cover assembly as described in the first aspect above.

[0027] Compared to existing technologies, in the battery cover assembly and battery of the present invention, a fixing plate is provided on the inner side of the cover plate near the battery cell, for example, a fixing plate is provided on the lower side of the cover plate. The connection between the fixing plate and the cover plate fixes the position of the terminal post relative to the terminal post mounting hole, thus fixing the position of the terminal post relative to the cover plate. This avoids the need to provide terminal post mounting parts, such as connecting blocks, on the side of the cover plate away from the battery cell, such as the upper side of the cover plate. This reduces the height of the portion of the terminal post exposed above the cover plate. With the space for battery installation remaining unchanged, the size of the battery casing can be designed to be relatively large, thus providing more space for arranging the battery cell. This avoids the problem of relatively low battery space utilization and low energy density caused by the high height of the portion of the terminal post exposed above the cover plate. Furthermore, the terminal post has a tab connection portion formed on the inner side of the cover plate. This tab connection portion allows for direct welding to the terminal post, eliminating the need for additional connecting tabs to achieve conductive connection between the terminal post and the tab. This reduces the number of welding steps, thereby decreasing the number of welding areas traversed by the current transmission path from the tab to the terminal post, thus lowering internal resistance. Furthermore, avoiding connecting tabs reduces the space occupied by the battery casing, improving space utilization. This invention effectively balances the requirements of reducing the exposed height of the terminal post and reducing internal resistance, improving space utilization, and reducing welding steps, thereby enhancing battery performance. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the battery cover assembly in Scheme 1 of the present invention;

[0029] Figure 2 for Figure 1 Sectional view of section AA;

[0030] Figure 3 for Figure 1 Exploded view of the battery cover assembly shown;

[0031] Figure 4 This is an exploded cross-sectional view of the battery cover assembly in Scheme 1 of the present invention;

[0032] Figure 5 This is a schematic diagram of the inner side of the cover plate in Scheme 1 of the present invention;

[0033] Figure 6 This is a schematic diagram of the first insulating structure in Scheme 1 of the present invention;

[0034] Figure 7 This is a schematic diagram of the pole structure in Scheme 1 of the present invention;

[0035] Figure 8 for Figure 7 Another structural schematic diagram of the pole shown;

[0036] Figure 9 This is an exploded cross-sectional view of the battery cover assembly in Scheme 2 of the present invention;

[0037] Figure 10 This is another structural schematic diagram of the battery cover assembly when the connecting parts of different setting ends are connected as a whole in Scheme 2 of the present invention;

[0038] Figure 11 This is a schematic diagram of the structure of the fixing plate in Scheme 2 of the present invention;

[0039] Figure 12 This is an exploded cross-sectional view of the battery cover assembly in embodiment three of the present invention, where the sealing element is also used to form the second insulating structure.

[0040] Figure 13 This is an exploded cross-sectional view of the battery cover assembly when the third insulating structure forms a cavity in Scheme 4 of the present invention;

[0041] Figure 14 for Figure 13 Another structural schematic diagram of the battery cover assembly shown.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1-Cover plate; 11-Pole mounting hole; 12-Counter groove; 121-First counter groove; 122-Second counter groove; 2-Pole post; 21-Post body; 22-Stop structure; 221-Stop plate; 23-Pole lug connection; 231-Extension plate; 24-Weight reduction groove; 3-Fixing plate; 31-Plate body; 32-Connection part; 321-Folded edge; 33-Weight reduction hole; 4-Insulation structure; 41-First insulation structure; 411-Plate-shaped body; 412-Support part; 413-Protrusion structure; 414-First through hole; 415-Second through hole; 416-Accommodation space; 417-Limiting groove; 42-Second insulation structure; 421-Sleeve body; 422-Lip; 43-Third insulation structure; 431-Side part; 432-Upper flange; 433-Cavity; 5-Sealing element. Detailed Implementation

[0044] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] In the description of this specification, the references to terms such as "embodiment," "one embodiment," "some implementations," "exemplary," and "one implementation," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0047] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0048] In the attached figures, the Z-axis represents the vertical direction, i.e., the up-down position, with the positive direction of the Z-axis (where the arrow points) indicating up and the negative direction (opposite to the positive direction) indicating down. The X-axis represents the horizontal direction, designated as left-right, with the positive direction of the X-axis (where the arrow points) indicating right and the negative direction (opposite to the positive direction) indicating left. The Y-axis represents the front-back position, with the positive direction of the Y-axis (where the arrow points) indicating front and the negative direction (opposite to the positive direction) indicating back. It should be noted that the aforementioned representations of the Z, Y, and X axes are merely for the convenience of describing the invention 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 the invention.

[0049] like Figures 1 to 3 As shown, this embodiment of the invention provides a battery cover assembly, including a cover plate 1, a terminal post 2, and a fixing plate 3; the cover plate 1 is provided with a terminal post mounting hole 11, the fixing plate 3 is located on the inner side of the cover plate 1 near the battery cell (not shown in the figure) and is connected to the cover plate 1, the terminal post 2 passes through the terminal post mounting hole 11, and the fixing plate 3 limits the position of the terminal post 2 and the cover plate 1; the terminal post 2 has a tab connection portion 23 formed on the inner side of the cover plate 1, and the tab connection portion 23 is used for welding connection with the tab of the battery cell.

[0050] It should be noted that there are generally two pole mounting holes 11, namely a positive pole mounting hole and a negative pole mounting hole. The pole 2 and the fixing plate 3, etc., and other components described later can be set into two sets corresponding to the positive pole mounting holes and the negative pole mounting holes as needed. This will not be explained in detail later.

[0051] It should be noted that current leakage at pole 2 should generally be avoided. Specifically, insulation design is required between pole 2 and cover plate 1 or fixing plate 3. The specific implementation method is not limited and relevant technologies can be adopted. For example, an insulating coating can be applied to the part of pole 2 that contacts cover plate 1 and the part of pole 2 that contacts fixing plate 3. Other related technologies can also be set between pole 2 and cover plate 1. For example, a sealing design can be implemented at pole mounting hole 11.

[0052] In this specification, the invention is described using the example where the cover plate 1 is located on top of the battery casing and the inner side of the cover plate 1 is the lower side.

[0053] The connection method between the fixing plate 3 and the cover plate 1 is not limited. For example, a connecting post can be set at the lower end of the cover plate 1, the fixing plate 3 can be connected to the connecting post, and the pole 2 can be restricted to the pole mounting hole 11 through the connection between the fixing plate 3 and the pole 2.

[0054] In this embodiment, a fixing plate 3 is provided on the inner side of the cover plate 1 near the battery cell, for example, a fixing plate 3 is provided on the lower side of the cover plate 1. The connection between the fixing plate 3 and the cover plate 1 fixes the position of the terminal post 2 relative to the terminal post mounting hole 11, thus fixing the position of the terminal post 2 relative to the cover plate 1. This avoids the need to provide mounting parts for the terminal post 2, such as connecting blocks, on the side of the cover plate 1 away from the battery cell, such as the upper side of the cover plate 1. This reduces the height of the portion of the terminal post 2 exposed above the cover plate 1. With the space for installing the battery remaining unchanged, the size of the battery casing can be designed to be relatively large, thus providing more space for arranging the battery cell. This avoids the problem of relatively low space utilization and low energy density of the battery caused by the high height of the portion of the terminal post 2 exposed above the cover plate 1. Furthermore, the terminal post 2 has a tab connection portion 23 formed on the inner side of the cover plate 1. The tab connection portion 23 allows for direct welding to the tab, eliminating the need for additional connecting pieces to achieve conductive connection between the tab and the terminal post 2. This reduces the number of welding steps, thereby decreasing the number of welding areas traversed by the current transmission path from the tab to the terminal post 2, thus reducing internal resistance. Furthermore, avoiding connecting pieces reduces the internal space occupied by the battery casing, improving space utilization. This invention effectively balances the requirements for reducing the exposed height of the terminal post and reducing internal resistance, improving space utilization and reducing welding steps, thereby enhancing battery performance.

[0055] like Figure 2 As shown, optionally, the pole post 2 includes a pole body 21 and a stop structure 22 located at one end of the pole body 21 near the cell. The cross-sectional area of ​​the pole body 21 is less than or equal to the cross-sectional area of ​​the pole post mounting hole 11, and the cross-sectional area of ​​the stop structure 22 is greater than the cross-sectional area of ​​the pole post mounting hole 11. The tab connection portion 23 is disposed at one circumferential end of the stop structure 22.

[0056] Specifically, the cross-section of the stop structure 22 is parallel to the XY plane. Generally, the cross-sectional area of ​​the outer contour of the stop structure 22 is larger than the minimum cross-sectional area of ​​the pole post mounting hole 11. When the pole 21 passes through the pole post mounting hole 11, the projection of the stop structure 22 in the vertical direction at least partially falls on the outside of the pole post mounting hole 11. The stop structure 22 can restrict the pole 21 from detaching from the pole post mounting hole 11 from the opposite side inside, that is, it can restrict the pole 2 from falling upwards out of the pole post mounting hole 11. Based on this, the specific structure of the stop structure 22 is not a limitation.

[0057] Thus, when assembling the pole post 2, first insert the pole body 21 of the pole post 2 into the pole post mounting hole 11 from the bottom, then press the fixing plate 3 on the bottom side of the stop structure 22 of the pole post 2, and then connect the fixing plate 3 and the cover plate 1 by means of welding, for example, to fix the position of the pole post 2.

[0058] like Figure 2 , Figure 7 and Figure 8 As shown, exemplarily, the stop structure 22 is configured as a stop plate 221 surrounding the column 21 of the pole post 2, and the pole lug connection portion 23 is formed by an extension plate 231 located at one end of the stop plate 221 and extending away from the column 21. The extension plate 231 can be disposed away from the cover plate 1 relative to the stop plate 221. For example, the end face of the extension plate 231 near the cover plate 1 is recessed within the end face of the stop plate 221 near the cover plate 1, that is, the upper end face of the extension plate 231 is lower than the upper end face of the stop plate 221. The present invention will be described using this example later. Of course, the upper end face of the extension plate 231 may also be disposed above the upper end face of the stop plate 221 as needed (this case is not shown).

[0059] like Figure 2 and Figure 3 As shown, optionally, the fixing plate 3 includes a plate body 31 and a connecting portion 32. When the column 21 passes through the pole mounting hole 11, the stop structure 22 is located inside the cover plate 1, and the plate body 31 is at least partially located on the side of the stop structure 22 away from the cover plate 1. The connecting portion 32 is located in one or more circumferential directions of the plate body 31, and the connecting portion 32 extends towards the side closer to the cover plate 1 and connects to the cover plate 1. For example, the connecting portion 32 is welded to the cover plate 1.

[0060] The contact surface between the plate 31 of the fixing plate 3 and the pole post 2 can be a plane parallel to the XY plane, but it is not limited to this. It can restrict the pole post 2 from disengaging from the pole post mounting hole 11 from the inside.

[0061] Thus, when assembling the pole post 2, the pole post 21 is first inserted into the pole post mounting hole 11 from the bottom. Then, the plate 31 of the fixing plate 3 is pressed on the bottom of the stop structure 22 of the pole post 2. Then, the connecting part 32 is welded to the cover plate 1. Thus, the stop structure 22 can restrict the pole post 2 from moving upward and detaching from the pole post mounting hole 11, and the plate 31 of the fixing plate 3 can restrict the pole post 2 from moving downward and detaching from the pole post mounting hole 11. The pole post 2 is reliably positioned at the pole post mounting hole 11, has high stress stability, and is highly practical.

[0062] Furthermore, along the circumference of the plate 31, a plurality of ends of the plate 31 are provided with connecting portions 32; wherein, the connecting portions 32 at least two ends are spaced apart, and / or, the plurality of ends include at least two setting ends, the setting ends being different from the end of the plate 31 where the electrode tab connecting portion 23 is located when the electrode post 2 passes through the electrode post mounting hole 11, and the connecting portions 32 of the at least two setting ends are connected as a whole in the circumference of the plate 31.

[0063] like Figure 2 and Figure 3 As shown, exemplarily, when the fixing plate 3 presses against the pole post 2, the tab connection portion 23 is located at the right end relative to the plate body 31. At least two of the left, front, rear, and right ends of the plate body 31 are provided with this connection portion 32, and the connection portions 32 at each end are spaced apart. For example, the connection portion 32 at the right end is spaced apart from the connection portions 32 at the front and rear ends in the circumferential direction of the plate body 31 (not shown in this schematic diagram). In this case, the pole post 2, for example, the tab connection portion 23 or the stop structure 22, needs to be provided with a clearance hole for the connection portion 32 at the right end to pass through.

[0064] like Figures 1 to 4 In the illustrated scheme 1, the connecting portion 32 is provided at the left, front, and rear ends of the plate 31, and the connecting portions 32 at each end are spaced apart. For example... Figures 9 to 11 In the second embodiment shown, the connecting part 32 is provided at the left end, front end and rear end of the plate 31, and the connecting parts 32 at the left end, front end and rear end are connected as a whole along the circumference of the plate 31 (at this time, the number of the set ends is three, namely the left end, front end and rear end of the plate 31).

[0065] like Figure 3 As shown, in an alternative embodiment of the connecting portion 32, an outwardly folded edge 321 is formed at the end of the connecting portion 32 away from the plate 31, and the folded edge 321 is attached to and connected to the cover plate 1, for example, by welding.

[0066] Taking the connecting part 32 located on the left as an example, its upper end is folded to the left to form a folded edge 321 extending to the left. The folded edge 321 is attached to the cover plate 1 and welded together, for example, by laser welding at the edge of the folded edge 321.

[0067] This increases the contact area between the connecting part 32 and the cover plate 1, thereby improving the reliability of the connection between the fixing plate 3 and the cover plate 1.

[0068] Of course, at this time, the folded edge 321 can also be provided with an opening, and the inner wall of the opening can be welded to the cover plate 1 (not shown in this scheme diagram).

[0069] like Figure 2 As shown, optionally, the battery cover assembly also includes an insulating structure 4, for example, to achieve at least partial insulation between the terminal post 2 and the cover 1, and / or to achieve at least partial insulation between the terminal post 2 and the fixing plate 3.

[0070] The insulating structure 4 may include one or more of the first insulating structure 41, the second insulating structure 42, and the third insulating structure 43.

[0071] The second insulating structure 42 is located on the outer periphery of the column 21 and between the column 21 and the pole mounting hole 11.

[0072] The second insulation structure 42 can employ related technologies. For example, the second insulation structure 42 includes a sleeve 421 that is fitted onto the post 21, separating the outer wall of the post 21 from the inner wall of the pole mounting hole 11. This prevents the post 21 from contacting the pole mounting hole 11 and causing leakage at the inner wall of the pole mounting hole 11. The second insulation structure 42 may also include a lip 422 located on the bottom plate of the sleeve 421, extending at least partially between the end face of the pole mounting hole 11 and the stop structure 22 of the pole 2.

[0073] The third insulating structure 43 is at least partially located on the side of the stop structure 22 away from the cover plate 1 and is located between the plate 31 and the stop structure 22.

[0074] Thus, the third insulation structure 43 achieves insulation between the plate 31 and the stop structure 22 at least on the lower side of the stop structure 22, avoiding leakage of the pole 2 at the lower surface of the stop structure 22.

[0075] The first insulating structure 41 is disposed on the inner side of the cover plate 1 and separates the cover plate 1 and the battery cell. The first insulating structure 41 has a first through hole 414 that communicates with the electrode mounting hole 11, and the post 21 passes through the first through hole 414. The side of the first insulating structure 41 away from the cover plate 1 can fit against the electrode tab connection part 23.

[0076] like Figure 3 and Figure 6 As shown, the specific structure of the first insulating structure 41 can adopt relevant technologies, which can separate the cover plate 1 from the battery cell. The connection method between the first insulating structure 41 and the cover plate 1 can adopt relevant technologies.

[0077] like Figure 10 In the second scheme shown, the cross-sectional area of ​​the first through hole 414 can be set to be greater than the cross-sectional area of ​​the stop plate 221. That is, the projection of the stop plate 221 along the axial direction of the column 21 falls inside the first through hole 414.

[0078] At this time, the lip 422 of the second insulating structure 42 can achieve insulation between the stop plate 221 of the stop structure 22 of the pole post 2 and the cover plate 1 to a certain extent. A sealing element 5 may also be included, which is disposed around the post 21 to form a seal at the pole post mounting hole 11. Exemplarily, the sealing element 5 is at least partially located between the end face of the pole post mounting hole 11 and the stop structure 22. For example, the sealing element 5 is located outside the second insulating structure 42, specifically, sleeved on the outside of the lip 422. The sealing of the pole post 2 around the pole post mounting hole 11 is achieved through the contact of the sealing element 5 with the cover plate 1 and the stop structure 22 of the pole post 2, respectively.

[0079] In this case, the third insulation structure 43 can also be configured to be at least partially located on the periphery of the stop plate 221, for example... Figure 10 In the middle, the third insulating structure 43 may include an upwardly extending side portion 431, which forms a protection against the peripheral side wall of the stop plate 221, thereby preventing the connecting portion 32 of the fixing plate 3 from contacting the peripheral side wall of the stop plate 221.

[0080] Of course, in, for example Figure 2 and Figure 3 In the illustrated scheme one, unlike scheme two where the cross-sectional area of ​​the first through hole 414 is larger than that of the stop plate 221, the cross-sectional area of ​​the first through hole 414 can be set to be smaller than that of the stop plate 221. That is, the projection of the stop plate 221 along the axial direction of the column 21 at least partially falls outside the first through hole 414. In this case, in some embodiments, the lower end face of the first insulating structure 41 at the first through hole 414 can contact the stop plate 221, for example, at the periphery of the seal 5, and the upper end face of the first insulating structure 41 at the first through hole 414 can contact the cover plate 1, thereby achieving at least partial isolation between the stop plate 221 and the cover plate 1.

[0081] It should be noted that the arrangement of the sealing element 5 is not limited to the above-described manner. It can be arranged around the column 21 to form a seal at the pole mounting hole 11. Related technologies can be employed. For example, the sealing element 5 can be embedded in the inner wall of the pole mounting hole 11, and the contact with the column 21 achieves a seal at the pole mounting hole 11.

[0082] like Figure 12 In the illustrated scheme three, optionally, the seal 5 also serves to form a second insulating structure 42. That is, the seal 5 not only provides a seal but also serves at least to insulate the column 21 from the pole mounting hole 11.

[0083] like Figure 13 and Figure 14 In the fourth embodiment shown, in an alternative embodiment of the third insulating structure 43, a portion of the third insulating structure 43 is located on the side of the stop structure 22 near the cover plate 1, and the third insulating structure 43 forms a cavity 433.

[0084] That is, the upper end of the side portion 431 of the third insulating structure 43 can be higher than the upper end of the stop plate 221, and the upper end of the side portion 431 extends towards the side close to the column 21 to form an upper flange 432, which is located between the upper surface of the stop plate 221 and the cover plate 1.

[0085] At this point, the stop structure 22 is at least partially embedded within the cavity 433. This cavity 433 can accommodate the stop plate 221, and the third insulating structure 43 can be configured to have a certain degree of flexibility, being fitted onto the electrode plate after the third insulating structure 43 is formed. Figure 13 A schematic diagram of the third insulating structure 43 forming a cavity 433 is shown. In this case, the third insulating structure 43 can be replaced according to the usage requirements.

[0086] Of course, at this point, the third insulating structure 43 and the terminal post 2 can be connected to form an integrated structure, or the third insulating structure 43, the second insulating structure 42, and the terminal post 2 can be connected to form an integrated structure; the integrated structure is integrally injection molded with the terminal post 2 as an insert. In this case, it is convenient to assemble the entire battery cover assembly and simplify the assembly process.

[0087] like Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 9 As shown, in an optional embodiment of the first insulating structure 41, a receiving space 416 communicating with the first through hole 414 is formed on the side of the first insulating structure 41 away from the cover plate 1. When the pole post 2 is installed at the pole post mounting hole 11, the end faces of the pole post 2 and the fixing plate 3 away from the cover plate 1 are both located in the receiving space 416.

[0088] Specifically, the first insulating structure 41 includes a plate-shaped body 411 and support portions 412 located at, for example, both ends of the plate-shaped body 411 along its length. The bottom surface of the support portions 412 is lower than the bottom surface of the plate-shaped body 411, and the portion between the support portions 412 forms the accommodating space 416. When the electrode post 2 is installed at the electrode post mounting hole 11, the lower surfaces of both the electrode post 2 and the fixing plate 3 are higher than the bottom surface of the support portion 412. Thus, the accommodating space 416 can also provide some protection for the lower ends of the fixing plate 3 and the electrode post 2, preventing, for example, the plate body 31 of the fixing plate 3 and the electrode tab connection portion 23 of the electrode post 2 from protruding downwards into the accommodating space 416 and contacting the battery cell.

[0089] like Figures 2 to 6 As shown, in an alternative embodiment of the first insulating structure 41, a limiting groove 417 is formed on the side of the first insulating structure 41 away from the cover plate 1, and the stop structure 22 and / or the electrode connecting portion 23 is accommodated in the limiting groove 417, the limiting groove 417 restricts the displacement of the stop structure 22 and / or the electrode connecting portion 23 in at least one circumferential direction.

[0090] The limiting groove 417 is formed on the plate-shaped body 411. Figures 2 to 6 The illustration shows a limiting groove 417 with a stepped groove, different portions of which respectively accommodate the stop plate 221 and the extension plate 231.

[0091] It should be understood that the limiting groove 417 may only accommodate the stop plate 221. In this case, the upper surface of the extension plate 231 may be lower than the upper surface of the stop plate 221, and the upper surface of the extension plate 231 may contact the lower surface of the plate-shaped body 411. The limiting groove 417 may also only accommodate the tab connection portion 23. For example, the upper surface of the extension plate 231 may be higher than the upper surface of the stop plate 221, and the lower surface of the extension plate 231 may be lower than the upper surface of the stop plate 221.

[0092] In an alternative embodiment of the present invention, the first insulating structure 41 may be formed with the limiting groove 417 and the accommodating space 416, in which case the limiting groove 417 and the accommodating space 416 are in communication.

[0093] It should be noted that the cover plate 1 can also be equipped with an injection port and an explosion-proof valve as needed, and the accommodating space 416 can also cover the area where the injection port and the explosion-proof valve are located.

[0094] It should be understood that a second through hole 415 may also be provided on the first insulating structure 41, and the connecting part 32 of the fixing plate 3 passes through the second through hole 415. The second through hole 415 and the first through hole 414 may be provided alternately (e.g., Figure 6 ), and can also be connected (e.g. Figure 10 (This diagram only marks the first via 414).

[0095] like Figure 2, Figure 12 and Figure 13 As shown, in the above embodiments of the present invention, optionally, a groove 12 is formed on the inner side of the cover plate 1;

[0096] The sink 12 includes a first sink 121, which is connected to the pole mounting hole 11. The first sink 121 is provided corresponding to the stop structure 22, and the cross-sectional area of ​​the first sink 121 is greater than or equal to the cross-sectional area of ​​the stop structure 22.

[0097] Specifically, the first recess 121 can accommodate the stop structure 22. When the battery cover assembly includes the aforementioned insulating structure 4, the first recess 121 can also selectively accommodate the insulating structure 4 as needed.

[0098] For example, such as Figure 2 , Figure 4 and Figure 10 As shown, the plate-shaped body 411 of the first insulating structure 41 is provided with a protruding structure 413. The protruding structure 413 protrudes towards the side near the cover plate 1. The protruding structure 413 is accommodated in the first recess 121 and forms at least a partial insulating barrier to the pole post 2. The first recess 121 can also accommodate the sealing element 5, the lip 422 of the second insulating structure 42, and the upper flange 432 of the third insulating structure 43, etc., which will not be described in detail here.

[0099] In this way, the overall height requirement of the pole post 2 can be reduced, the position of the first insulating structure 41 can be positioned, and the cross-sectional shape of the first sink 121 can be set to be non-circular. During the process of fixing the first insulating structure 41 to the cover plate 1, the rotation of the first insulating structure 41 relative to the cover plate 1 can be restricted.

[0100] Optionally, the sink 12 includes a second sink 122, and the end of the connecting portion 32 near the cover plate 1 is accommodated in the second sink 122 and connected to the cover plate 1 at the sink 12.

[0101] Specifically, the folded edge 321 of the connecting part 32 is accommodated in the second recess 122. The folded edge 321 and the cover plate 1 are welded by, for example, laser welding. At this time, according to the welding requirements, the second through hole 415 should also have a gap for welding operation, which will not be described in detail here.

[0102] Furthermore, when the settling tank 12 includes a first settling tank 121 and a second settling tank 122, the second settling tank 122 is located circumferentially outside the first settling tank 121, and the second settling tank 122 is connected to or spaced apart from the first settling tank 121.

[0103] Specifically, whether the first settling tank 121 and the second settling tank 122 are connected or spaced apart is determined according to specific needs, such as the position of the connecting part 32 relative to the stop plate 221. For example, if the two are far apart, they are generally set to be spaced apart, and if the two are close, they can be connected. Figure 5 The diagram shows the two components connected. When they are spaced apart, the heat generated during welding can be transferred to the second insulation structure 42 to a certain extent, which will not be described in detail here.

[0104] like Figure 8 As shown, in an optional embodiment of the present invention, the pole post 2 is a stamped part; in this case, it is convenient to form the pole post 2 and the cost is low. The fixing plate 3 can also be set as a stamped part.

[0105] like Figure 8 As shown, in an optional embodiment of the present invention, the electrode post 2 is formed with a weight-reduction groove 24, the opening of which faces the battery cell. This reduces the weight of the electrode post 2 and lowers costs.

[0106] Furthermore, the fixing plate 3 is formed with a weight-reducing hole 33 and / or a top-pressing structure (not shown in the figure) corresponding to the weight-reducing groove 24.

[0107] Weight reduction can be achieved through the weight reduction hole 33, and the interior of the weight reduction groove 24 can also be observed and maintained through the weight reduction hole 33. The top pressure structure is formed by the plate 31 of the fixing plate 3 protruding upward. The top pressure structure presses against one or more side walls of the weight reduction groove 24 in an insulating manner, which can enhance the stress performance of the pole 2 at the weight reduction groove 24.

[0108] Of course, when a top pressure structure is provided, the weight reduction hole 33 can be set on the top pressure structure, which will not be described in detail here.

[0109] Another embodiment of the present invention provides a battery that includes the battery cover assembly as described in the above embodiment. For example, the battery is a prismatic lithium battery, and some aspects of the battery have already been described above, so they will not be described in detail here.

[0110] Another embodiment of the present invention provides a vehicle including a power battery, the power battery including a plurality of batteries of the above embodiments.

[0111] For example, the power battery also includes a busbar, which is connected to the exposed portion of the terminal post 2 of the battery cover assembly of several embodiments described above, and will not be described in detail here.

[0112] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A battery cover plate assembly, characterized by, The battery cover plate (1) assembly further comprises an insulation structure (4), the insulation structure (4) comprises a first insulation structure (41), the first insulation structure (41) is arranged on the inner side of the cover plate (1) and separates the cover plate (1) and the battery cell, The first insulation structure (41) is formed with a second via hole (415) and a first via hole (414) in communication with the pole post mounting hole (11), the side of the first insulation structure (41) away from the cover plate (1) is formed with a containing space (416) in communication with the first via hole (414) and the second via hole (415) respectively; The pole post (2) is arranged in the first via hole (414), the tab connecting part (23) is located on the side of the first insulation structure (41) away from the cover plate (1), the connecting part (32) of the fixing plate (3) passes through the second via hole (415) and is welded with the cover plate (1), and the end faces of the pole post (2) and the fixing plate (3) away from the cover plate (1) are located in the containing space (416). The end of the connecting part (32) away from the plate body (31) is formed with an outwardly folded folding edge (321), the folding edge (321) is attached to the cover plate (1) and is welded with the cover plate (1); The pole post (2) comprises a column body (21) and a stop structure (22) located at one end of the column body (21) close to the battery cell, the cross-sectional area of the column body (21) is less than or equal to the cross-sectional area of the pole post mounting hole (11), the cross-sectional area of the stop structure (22) is greater than the cross-sectional area of the pole post mounting hole (11), and the tab connecting part (23) is arranged at one end of the stop structure (22) in the circumferential direction; The fixing plate (3) comprises a plate body (31) and a connecting part (32), the plate body (31) is at least partially located on the side of the stop structure (22) away from the cover plate (1), the connecting part (32) is located in one or more directions in the circumferential direction of the plate body (31), the connecting part (32) extends to the side close to the cover plate (1) and is connected with the cover plate (1); 2. The battery cover plate assembly of claim 1, wherein, The battery cover plate (1) assembly further comprises an insulation structure (4), the insulation structure (4) comprises a first insulation structure (41), the first insulation structure (41) is arranged on the inner side of the cover plate (1) and separates the cover plate (1) and the battery cell, The first insulation structure (41) is formed with a second via hole (415) and a first via hole (414) in communication with the pole post mounting hole (11), the side of the first insulation structure (41) away from the cover plate (1) is formed with a containing space (416) in communication with the first via hole (414) and the second via hole (415) respectively; And / or, a plurality of end portions of the plate body (31) are provided with the connecting portion (32) along the circumference of the plate body (31); wherein the connecting portions (32) of at least two end portions are spaced apart, and / or, a plurality of the end portions include at least two set end portions, which are different from one end of the tab connecting portion (23) relative to the plate body (31) when the pole column (2) passes through the pole column mounting hole (11), and the connecting portions (32) of the at least two set end portions are connected as a whole in the circumference of the plate body (31).

3. The battery cover plate assembly of claim 1, wherein, The insulating structure (4) further comprises one or more of a second insulating structure (42) and a third insulating structure (43); The second insulating structure (42) is located outside the column body (21) and between the column body (21) and the pole column mounting hole (11); The third insulating structure (43) is at least partially located on the side of the stop structure (22) away from the cover plate (1) and between the plate body (31) and the stop structure (22).

4. The battery cover plate assembly of claim 3, wherein, The side of the first insulating structure (41) away from the cover plate (1) is formed with a limiting groove (417) in communication with the first through hole (414), the stop structure (22) and / or the tab connecting portion (23) is accommodated in the limiting groove (417), and the limiting groove (417) limits the displacement of the stop structure (22) and / or the tab connecting portion (23) in at least one direction in the circumference; the limiting groove (417) is in communication with the accommodating space (416).

5. The battery cover plate assembly of claim 3, wherein, Further comprising a sealing member (5) arranged around the column body (21) and forming a seal for the pole column mounting hole (11); The sealing member (5) is also used to form the second insulating structure (42); and / or, the sealing member (5) is at least partially located between the end face of the pole column mounting hole (11) and the stop structure (22).

6. The battery cover plate assembly of claim 3, wherein, Part of the third insulating structure (43) is located on the side of the stop structure (22) close to the cover plate (1), and the third insulating structure (43) is formed with a cavity (433); The stop structure (22) is at least partially embedded in the cavity (433), or the third insulating structure (43) and the pole column (2) are connected and form an integral structure, or the third insulating structure (43), the second insulating structure (42) and the pole column (2) are connected and form an integral structure.

7. The battery cover plate assembly of any one of claims 1 to 6, wherein, The cover plate (1) is formed with a sink (12) on the inner side; The sink (12) comprises a first sink (121), the first sink (121) is in communication with the pole column mounting hole (11), the first sink (121) is arranged corresponding to the stop structure (22), and the cross-sectional area of the first sink (121) is greater than or equal to the cross-sectional area of the stop structure (22); And / or, the sink groove (12) comprises a second sink groove (122), an end of the connecting part (32) close to the cover plate (1) is accommodated in the second sink groove (122), and the connecting part (32) is connected with the cover plate (1) at the second sink groove (122); When the sink groove (12) comprises the first sink groove (121) and the second sink groove (122), the second sink groove (122) is located at the circumferential outside of the first sink groove (121), and the second sink groove (122) is in communication with the first sink groove (121) or is arranged in a spaced manner.

8. The battery cover plate assembly of claim 1, wherein, The pole column (2) is a stamping part; and / or, the pole column (2) is formed with a weight-reducing groove (24), and an opening of the weight-reducing groove (24) faces the battery cell.

9. A battery, characterized by A battery cover plate assembly comprising the battery cover plate assembly according to any one of claims 1 to 8.

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