A cover plate assembly of a power battery and a power battery formed thereby

Abstract

The utility model provides a kind of cover plate assembly of power battery and power battery formed by it, wherein cover plate assembly includes pole, sealing ring, cover plate structural member and adapter plate, pole placement through-hole is provided in cover plate structural member, pole includes pole square end and pole cylindrical end;The junction of pole square end and pole cylindrical end is provided with stress notch around the outer circumferential side of pole cylindrical end;Pole square end is connected in the top of pole placement through-hole, pole cylindrical end penetrates pole placement through-hole and is abutted with adapter plate;Sealing ring is provided between pole cylindrical end and pole placement through-hole.Due to the stress notch being set in the top of pole cylindrical end in the present application, and stress concentration in riveting process near stress notch, so that expansion occurs between riveting recess and stress notch in pole cylindrical end, so that pole cylindrical end and sealing ring are tightly fixed, and then the firmness of connection between pole and cover plate structural member is enhanced.

Description

Technical Field

[0001] This utility model relates to the technical field of cover plate structures in power batteries, and in particular to a cover plate assembly for a power battery and the power battery formed therefrom. Background Technology

[0002] Benefiting from the global trend of energy conservation and emission reduction and the rapid development of new energy vehicles, the demand for power batteries is growing rapidly. As a key component of power batteries, cover plate assemblies have seen various product types on the market. In actual production and use, existing cover plate assemblies are prone to issues such as rotation of the terminal post relative to the cover plate, longitudinal loosening, or detachment, leading to abnormalities like terminal post airtightness failure. This is because after the cover plate assembly and terminal post are assembled, they need to be riveted. During riveting, the terminal post deforms under the impact force, and the location and size of this deformation cannot be controlled. This results in uneven stress at the sealing ring position in the terminal post and cover plate assembly, or poor contact defects, leading to sealing performance failure between the terminal post and the sealing ring. When the sealing performance of the sealing ring fails, it is often accompanied by displacement deviation between the terminal post and the cover plate assembly, making the connection between them weak.

[0003] To solve the above problems, it is necessary to develop a cover assembly that ensures good sealing performance and a firm connection between the pole and the cover assembly. Utility Model Content

[0004] To overcome the problems existing in related technologies, one of the objectives of this utility model is to provide a cover plate assembly for a power battery. Since this application provides a stress notch at the top of the cylindrical end of the pole post, and stress concentration occurs near the stress notch during the riveting process, expansion occurs between the riveting groove and the stress notch in the cylindrical end of the pole post, so that the cylindrical end of the pole post is tightly fixed to the sealing ring, thereby enhancing the firmness of the connection between the pole post and the cover plate structure and improving the sealing performance of the sealing ring.

[0005] A cover plate assembly for a power battery includes a terminal post, a sealing ring, a cover plate structure, and an adapter plate. The cover plate structure has a through hole for placing the terminal post. The terminal post includes a square end and a cylindrical end with their center lines coinciding. The cross-sectional area of ​​the square end of the terminal post is larger than the cross-sectional area of ​​the cylindrical end of the terminal post. A stress notch is provided at the junction of the square end and the cylindrical end of the terminal post, surrounding the outer periphery of the cylindrical end of the terminal post.

[0006] The square end of the pole post is snapped into the top of the pole post placement through hole, and the cylindrical end of the pole post passes through the pole post placement through hole and abuts against the adapter plate; a sealing ring is provided between the cylindrical end of the pole post and the pole post placement through hole.

[0007] In a preferred embodiment of this invention, an arc-shaped chamfer is provided at the connection between the cylindrical end and the square end of the pole post, and the stress notch is located on the side of the cylindrical end of the pole post near the arc-shaped chamfer.

[0008] In this application, during the riveting process, the cylindrical end of the pole is subjected to pressure on the side away from the square end, resulting in stress concentration near the stress notch. The expansion area formed by the pressure is concentrated between the cylindrical end face of the pole and the stress notch, and the expansion is more pronounced closer to the stress notch. This application provides an arc-shaped chamfer between the cylindrical and square ends of the pole, ensuring a smooth transition between them. Simultaneously, the stress notch is positioned on the cylindrical end of the pole without affecting the arc-shaped chamfer and is as close as possible to it. This ensures that the pressure impact is concentrated inside the cylindrical end of the pole, achieving an expansion seal connection between the cylindrical end of the pole and the sealing ring. It also prevents significant deformation between the square and cylindrical ends of the pole, which could affect the installation stability between the pole and the cover plate structure.

[0009] In a preferred embodiment of this invention, the cover plate structure includes an upper plastic part, a top cover plate, and a lower plastic part. The upper plastic part has an upper plastic electrode through hole, the top cover plate has a sealing and fixing hole, and the lower plastic part has a lower plastic electrode through hole. The center lines of the upper plastic electrode through hole, the sealing and fixing hole, and the lower plastic electrode through hole coincide. The sealing ring is fixed in the sealing and fixing hole, and the cylindrical end of the electrode passes through the upper plastic electrode through hole, the sealing and fixing hole, and the lower plastic electrode through hole in sequence.

[0010] In this application, the adapter plate is provided with pole post riveting holes, and the center line of the pole post riveting holes coincides with the center line of the lower plastic pole post through hole; in the assembled cover plate assembly, the upper plastic pole post through hole in the upper plastic part abuts against the square end of the pole post, a sealing ring is provided in the top cover plate, and the lower plastic pole post through hole in the lower plastic part overlaps with the pole post riveting hole; and the upper plastic pole post through hole, the sealing fixing hole, the lower plastic pole post through hole, and the pole post riveting hole together form a pole post placement through hole; after the pole post and the cover plate structure are assembled, the bottom of the cylindrical end of the pole post is flush with the bottom of the pole post riveting hole. During the riveting process, the riveting punch impacts the bottom of the cylindrical end of the pole post from the bottom of the pole post riveting hole to form a riveting groove, and a cylindrical deformation area is formed between the riveting groove and the stress notch to achieve a collision sealing connection between the cylindrical end of the pole post and the sealing ring.

[0011] In a preferred embodiment of this invention, the inner wall of the sealing and fixing hole is provided with M annular flow-stopping grooves; the M annular flow-stopping grooves are distributed circumferentially along the inner wall of the sealing and fixing hole; the outer wall of the sealing ring is provided with M sealing annular buckles that are adapted to the annular flow-stopping grooves; M is an integer greater than 0.

[0012] M can be an even number, and M annular flow-stopping grooves are evenly and symmetrically distributed on the inner wall of the sealing and fixing holes in the top cover plate. M sealing annular buckles are evenly and symmetrically distributed on the outer wall of the sealing ring. When the sealing ring is installed in the sealing and fixing holes, the sealing annular buckles and annular flow-stopping grooves fit together and are fixed, ensuring a firm connection between the sealing ring and the top cover plate. In conjunction with the pressure collision of the cylindrical end of the pole post and the tight fit with the sealing ring, the pole post can achieve good sealing performance. At the same time, it can also ensure a firm connection between the sealing ring and the cover plate structure, and prevent the position of the sealing ring relative to the cover plate structure from shifting.

[0013] In a preferred embodiment of this utility model, the bottom of the lower plastic part is interference-fitted with the adapter plate, the adapter plate is provided with a pole post riveting hole, the center line of the pole post riveting hole coincides with the center line of the lower plastic pole post through hole, and the cylindrical end of the pole post is located inside the pole post riveting hole.

[0014] This application sets an interference fit between the bottom of the lower plastic part and the adapter plate, which can ensure the firm connection between the lower plastic part and the adapter plate and avoid displacement deviation between the various components in the cover plate structure.

[0015] In a preferred embodiment of this invention, a positioning reinforcing rib is provided on the top side of the lower plastic part, and an R-angle is provided on the edge of the adapter plate. The shape of the positioning reinforcing rib is adapted to the shape of the R-angle in the adapter plate.

[0016] The positioning reinforcing ribs in this application not only ensure that the lower plastic part has good mechanical strength, but also can be snapped together with the R-angle adapter in the adapter plate, further ensuring the connection between the lower plastic part and the adapter plate.

[0017] In a preferred embodiment of this invention, a transition positioning wall is provided on the bottom side of the lower plastic part, and the transition positioning wall is interference-fitted with the transition plate.

[0018] In this application, the transition positioning wall is located at the bottom edge of the lower plastic part, and can be located at one edge, two edges, or three edges. During assembly, the transition positioning wall is snapped onto the top of the transition plate and has an interference fit with the transition plate, thereby achieving the assembly of the lower plastic part and the transition plate and the fast connection between the two.

[0019] In a preferred embodiment of this invention, the electrode post includes a positive electrode post and a negative electrode post, and the electrode post placement through hole includes a positive electrode post placement through hole and a negative electrode post placement through hole.

[0020] Correspondingly, this application also includes two through holes for placing the terminals: a positive terminal through hole and a negative terminal through hole; there are also two adapter plates: a positive adapter plate and a negative adapter plate. In this application, the positive terminal passes through the positive terminal through hole and connects to the positive adapter plate, and the negative terminal passes through the negative terminal through hole and connects to the negative adapter plate; the positive and negative adapter plates are respectively connected to both sides of the battery cell, forming a current loop.

[0021] In a preferred embodiment of this invention, the cover plate assembly further includes an explosion-proof valve. The cover plate structure is provided with an explosion-proof placement through hole for placing the explosion-proof valve. The bottom of the explosion-proof valve is provided with an explosion-proof groove, which is located inside the lower plastic part.

[0022] In this application, the explosion-proof placement through-hole is located between the positive terminal placement through-hole and the negative terminal placement through-hole, and is used to install the explosion-proof valve. The bottom of the explosion-proof valve is provided with explosion-proof grooves. The main function of these grooves is to quickly release internal pressure in abnormal situations. The indentation design of the explosion-proof grooves helps the explosion-proof valve to evenly bear pressure and crack along the grooves, preventing fragments from damaging other components. In this application, the explosion-proof grooves are built into the lower plastic part to prevent it from being damaged by external forces.

[0023] In a preferred embodiment of this invention, the top cover plate is provided with an explosion-proof through hole, the explosion-proof through hole is located at the geometric center of the top cover plate, the side of the explosion-proof through hole near the lower plastic part is provided with an annular first explosion-proof step, the side of the first explosion-proof step near the lower plastic part is provided with an annular second explosion-proof step, and the center lines of the explosion-proof through hole, the first explosion-proof step and the second explosion-proof step coincide.

[0024] The explosion-proof first step and explosion-proof second step of this application form a space for installing the explosion-proof valve. The bottom of the top cover needs to be fitted with a lower plastic part. The lower plastic part is provided with a lower plastic explosion-proof through hole. By setting the explosion-proof first step and explosion-proof second step, it can be ensured that the explosion-proof markings are located inside the lower plastic explosion-proof through hole, avoiding the explosion-proof markings being exposed on the outside of the cover plate structure and causing damage.

[0025] The second objective of this application is to provide a power battery, including the cover assembly described above.

[0026] The beneficial effects of this utility model are as follows:

[0027] The power battery cover assembly provided in this application includes a terminal post, a sealing ring, a cover structure, and an adapter plate. The terminal post includes a square end and a cylindrical end with their center lines coinciding. The cross-sectional area of ​​the square end is larger than that of the cylindrical end. A stress notch is provided at the junction of the square end and the cylindrical end, surrounding the outer periphery of the cylindrical end. The cover structure has a through hole for placing the terminal post. During assembly, the square end of the terminal post engages with the top of the through hole, and the cylindrical end penetrates the through hole and abuts against the adapter plate. A sealing ring is provided between the cylindrical end and the through hole. After the above-mentioned cover plate assembly is assembled, the cylindrical end of the pole post needs to be riveted using a riveting die punch. During the riveting process, a riveting groove is formed at the bottom of the cylindrical end of the pole post. Since this application sets a stress notch at the top of the cylindrical end of the pole post, and the stress is concentrated near the stress notch during the riveting process, expansion occurs between the riveting groove and the stress notch in the cylindrical end of the pole post, so that the cylindrical end of the pole post is tightly fixed to the sealing ring, thereby enhancing the firmness of the connection between the pole post and the cover plate structure and improving the sealing performance of the sealing ring.

[0028] This application provides a power battery. Because a stress notch is provided at the top of the cylindrical end of the electrode post, and stress is concentrated near the stress notch during the riveting process, expansion occurs between the riveting groove and the stress notch in the cylindrical end of the electrode post, so that the cylindrical end of the electrode post is tightly fixed to the sealing ring, thereby enhancing the firmness of the connection between the electrode post and the cover plate structure and improving the sealing performance of the sealing ring. Attached Figure Description

[0029] Figure 1 This is an exploded view of the cover plate assembly in an embodiment of this application;

[0030] Figure 2 This is a cross-sectional view of the cover plate assembly after assembly in an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the top cover sheet in an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the pole structure in an embodiment of this application.

[0033] Figure 5 This is a schematic diagram of the structure of the plastic in the embodiments of this application.

[0034] Figure 6 This is a schematic diagram of the sealing ring structure in an embodiment of this application.

[0035] Figure 7 This is a schematic diagram of the structure of the lower plastic in the embodiments of this application.

[0036] Figure 8This is a schematic diagram of the adapter plate in the embodiments of this application.

[0037] Figure 9 This is a schematic diagram of the structure of the adapter plate and the lower plastic assembly in an embodiment of this application;

[0038] Figure 10 This is a schematic diagram of the structure before and after the pole post is riveted in the embodiment of this application.

[0039] Figure label:

[0040] 100. Terminal post; 200. Upper plastic part; 300. Sealing ring; 400. Top cover plate; 500. Lower plastic part; 600. Adapter plate; 700. Explosion-proof protective patch; 800. Explosion-proof valve; 101. Cylindrical end of terminal post; 102. Square end of terminal post; 103. Riveting groove; 104. Stress notch; 105. Center hole of terminal post; 106. Cylindrical deformation area; 201. Through hole of upper plastic terminal post; 202. Upper plastic positioning wall; 301. Sealing through hole of terminal post; 302. Sealing ring buckle; 401. Upper plastic positioning... 402. Annular flow-stopping groove; 403. Sealing and fixing hole; 404. Explosion-proof through hole; 405. Explosion-proof first-level step; 406. Explosion-proof second-level step; 407. Injection hole; 501. Adapter positioning wall; 502. Avoidance notch; 503. Positioning slot; 504. Positioning reinforcing rib; 505. Lower plastic electrode through hole; 506. Lower plastic explosion-proof through hole; 507. Lower plastic injection through hole; 601. Welding slot; 602. Small bend; 603. Process notch; 604. Electrode riveting hole; 801. Explosion-proof markings. Detailed Implementation

[0041] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0042] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0043] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] Example 1

[0045] like Figures 1-10 As shown, this application provides a cover plate assembly for a power battery, including a terminal post 100, a sealing ring 300, a cover plate structure, and an adapter plate 600. The cover plate structure has a through hole for placing the terminal post. The terminal post 100 includes a square end 102 and a cylindrical end 101 with their center lines coinciding. The cross-sectional area of ​​the square end 102 is larger than the cross-sectional area of ​​the cylindrical end 101. A stress notch 104 is provided at the junction of the square end 102 and the cylindrical end 101, surrounding the outer periphery of the cylindrical end 101.

[0046] The square end 102 of the pole post is snapped into the top of the pole post placement through hole, and the cylindrical end 101 of the pole post passes through the pole post placement through hole and abuts against the adapter plate 600; a sealing ring 300 is provided between the cylindrical end 101 of the pole post and the pole post placement through hole.

[0047] In this application, there are two terminals 100, namely a positive terminal and a negative terminal, and there are also two corresponding terminal placement through holes. There are also two adapter plates 600. In this application, the positive terminal and the negative terminal are connected to the corresponding adapter plates 600 through the corresponding terminal placement through holes. The two adapter plates 600 are then connected to both sides of the battery cell to form a current loop.

[0048] The cover plate structure of this application is provided with a through hole for placing the pole post. During the assembly process, the square end 102 of the pole post is engaged with the top of the through hole for placing the pole post, and the cylindrical end 101 of the pole post passes through the through hole for placing the pole post and abuts against the adapter plate 600. A sealing ring 300 is provided between the cylindrical end 101 of the pole post and the through hole for placing the pole post. After the cover plate assembly is assembled, the cylindrical end 101 of the pole post needs to be riveted using a riveting die punch. During the riveting process, a riveting groove 103 is formed at the bottom of the cylindrical end 101 of the pole post. Since the present application provides a stress notch 104 at the top of the cylindrical end 101 of the pole post, and the stress notch 104 is subjected to stress concentration during the riveting process, expansion occurs between the riveting groove 103 and the stress notch 104 in the cylindrical end 101 of the pole post, so that the cylindrical end 101 of the pole post is tightly fixed to the sealing ring 300, thereby enhancing the firmness of the connection between the pole post 100 and the cover plate structure and improving the sealing performance of the sealing ring 300.

[0049] Example 2

[0050] like Figures 1-10 As shown, this application provides a cover plate assembly for a power battery, including a terminal post 100, a sealing ring 300, a cover plate structure, and an adapter plate 600. The cover plate structure has a terminal post placement through hole. The terminal post 100 includes a square end 102 and a cylindrical end 101 with their center lines coinciding. The cross-sectional area of ​​the square end 102 is larger than that of the cylindrical end 101. A stress notch 104 is provided at the junction of the square end 102 and the cylindrical end 101, surrounding the outer periphery of the cylindrical end 101. The square end 102 is engaged with the top of the terminal post placement through hole, and the cylindrical end 101 penetrates the terminal post placement through hole and abuts against the adapter plate 600. A sealing ring 300 is provided between the cylindrical end 101 and the terminal post placement through hole.

[0051] Furthermore, an arc-shaped chamfer is provided at the connection between the cylindrical end 101 and the square end 102 of the pole post, and the stress notch 104 is located on the side of the cylindrical end 101 of the pole post close to the arc-shaped chamfer.

[0052] In this application, during the riveting process, the cylindrical end 101 of the pole post 100 is compressed on the side away from the square end 102 of the pole post. Stress concentration occurs near the stress notch 104, and the expansion area formed by the compression is concentrated between the surface of the cylindrical end 101 of the pole post and the stress notch 104. The expansion is more obvious closer to the stress notch 104. This application provides an arc-shaped chamfer between the cylindrical end 101 and the square end 102 of the pole post, which can ensure a smooth transition between the cylindrical end 101 and the square end 102 of the pole post. At the same time, the stress notch 104 is set at the cylindrical end 101 of the pole post without affecting the arc-shaped chamfer and as close as possible to the arc-shaped chamfer. This can ensure that the pressure collision is concentrated inside the cylindrical end 101 of the pole post, realizing the expansion sealing connection between the cylindrical end 101 of the pole post and the sealing ring 300. At the same time, it avoids obvious deformation between the square end 102 and the cylindrical end 101 of the pole post, which would affect the installation firmness between the pole post 100 and the cover plate structure.

[0053] Furthermore, the cover plate structure includes an upper plastic part 200, a top cover plate 400, and a lower plastic part 500. The upper plastic part 200 is provided with an upper plastic electrode through hole 201, the top cover plate 400 is provided with a sealing and fixing hole 403, and the lower plastic part 500 is provided with a lower plastic electrode through hole 505. The center lines of the upper plastic electrode through hole 201, the sealing and fixing hole 403, and the lower plastic electrode through hole 505 coincide. The sealing ring 300 is fixed in the sealing and fixing hole 403, and the cylindrical end 101 of the electrode sequentially passes through the upper plastic electrode through hole 201, the sealing and fixing hole 403, and the lower plastic electrode through hole 505.

[0054] In this application, the adapter plate 600 is provided with a pole post riveting hole 604, and the center line of the pole post riveting hole 604 coincides with the center line of the lower plastic pole post through hole 505; in the assembled cover plate assembly, the upper plastic pole post through hole 201 in the upper plastic part 200 abuts against the square end 102 of the pole post, the top cover plate 400 is provided with a sealing ring 300, and the lower plastic pole post through hole 505 in the lower plastic part 500 overlaps with the pole post riveting hole 604; and the upper plastic pole post through hole 201, the sealing fixing hole 403, the lower plastic pole post through hole 505 and The pole post riveting hole 604 together form a through hole for placing the pole post; after the pole post 100 and the cover plate structure are assembled, the bottom of the cylindrical end 101 of the pole post is flush with the bottom of the pole post riveting hole 604. During the riveting process, the riveting punch impacts the bottom of the cylindrical end 101 of the pole post from the bottom of the pole post riveting hole 604 to form a riveting groove 103, and a cylindrical deformation area 106 is formed between the riveting groove 103 and the stress notch 104 to achieve a collision sealing connection between the cylindrical end 101 of the pole post and the sealing ring 300.

[0055] Furthermore, the inner wall of the sealing and fixing hole 403 is provided with M annular flow-stopping grooves 402; the M annular flow-stopping grooves 402 are distributed circumferentially along the inner wall of the sealing and fixing hole 403; the outer wall of the sealing ring 300 is provided with M sealing annular buckles 302 that are adapted to the annular flow-stopping grooves 402; M is an integer greater than 0.

[0056] M can be an even number, and M annular flow-stopping grooves 402 are evenly and symmetrically distributed in the inner wall of the sealing and fixing hole 403 in the top cover plate 400. M sealing annular buckles 302 are evenly and symmetrically distributed in the outer wall of the sealing ring 300. When the sealing ring 300 is installed in the sealing and fixing hole 403, the sealing annular buckles 302 and the annular flow-stopping grooves 402 are matched and locked together to ensure a firm connection between the sealing ring 300 and the top cover plate 400. With the pressure collision of the cylindrical end 101 of the pole post and the tight fit with the sealing ring 300, the pole post 100 can achieve good sealing performance. At the same time, it can also ensure a firm connection between the sealing ring 300 and the cover plate structure, and prevent the position of the sealing ring 300 relative to the cover plate structure from shifting.

[0057] Furthermore, the bottom of the lower plastic part 500 is interference-fitted with the adapter plate 600, and the adapter plate 600 is provided with a pole post riveting hole 604. The center line of the pole post riveting hole 604 coincides with the center line of the lower plastic pole post through hole 505, and the cylindrical end 101 of the pole post is located inside the pole post riveting hole 604.

[0058] This application sets an interference fit between the bottom of the lower plastic part 500 and the adapter plate 600, which can ensure the firm connection between the lower plastic part 500 and the adapter plate 600 and avoid displacement deviation between the various components in the cover plate structure.

[0059] Furthermore, a positioning reinforcing rib 504 is provided on the top side of the lower plastic part 500, and an R-angle is provided on the edge of the adapter plate 600. The shape of the positioning reinforcing rib 504 is adapted to the shape of the R-angle in the adapter plate 600.

[0060] The positioning reinforcing rib 504 of this application can not only ensure that the lower plastic part 500 has good mechanical strength, but also fit together with the R-angle adapter in the adapter plate 600, further ensuring the connection between the lower plastic part 500 and the adapter plate 600.

[0061] Furthermore, a transition positioning wall 501 is provided on the bottom side of the lower plastic part 500, and the transition positioning wall 501 is interference-fitted with the transition plate 600.

[0062] In this application, the adapter positioning wall 501 is located at the bottom edge of the lower plastic part 500, and can be located at one edge, two edges, or three edges. During the assembly process, the adapter positioning wall 501 is snapped onto the top of the adapter plate 600 and has an interference fit with the adapter plate 600, so as to realize the assembly of the lower plastic part 500 and the adapter plate 600 and the fast connection between the two.

[0063] Example 3

[0064] like Figures 1-10 As shown, this application provides a cover plate assembly for a power battery, including a terminal post 100, a sealing ring 300, a cover plate structure, and an adapter plate 600. The cover plate structure has a terminal post placement through hole. The terminal post 100 includes a square end 102 and a cylindrical end 101 with their center lines coinciding. The cross-sectional area of ​​the square end 102 is larger than that of the cylindrical end 101. A stress notch 104 is provided at the junction of the square end 102 and the cylindrical end 101, surrounding the outer periphery of the cylindrical end 101. The square end 102 is engaged with the top of the terminal post placement through hole, and the cylindrical end 101 penetrates the terminal post placement through hole and abuts against the adapter plate 600. A sealing ring 300 is provided between the cylindrical end 101 and the terminal post placement through hole.

[0065] Furthermore, the electrode post 100 includes a positive electrode post and a negative electrode post, and the electrode post placement through hole includes a positive electrode post placement through hole and a negative electrode post placement through hole.

[0066] Correspondingly, this application also includes two through holes for placing the terminals: a positive terminal through hole and a negative terminal through hole; there are also two adapter plates 600: a positive adapter plate and a negative adapter plate. In this application, the positive terminal passes through the positive terminal through hole and connects to the positive adapter plate, and the negative terminal passes through the negative terminal through hole and connects to the negative adapter plate; the positive and negative adapter plates are respectively connected to both sides of the battery cell, forming a current loop.

[0067] Furthermore, the cover plate assembly described in this application also includes an explosion-proof valve 800. The cover plate structure is provided with an explosion-proof placement through hole for placing the explosion-proof valve 800. The bottom of the explosion-proof valve 800 is provided with an explosion-proof groove 801, which is located inside the lower plastic part 500.

[0068] In this application, the explosion-proof placement through hole is located between the positive terminal placement through hole and the negative terminal placement through hole, and is used to install the explosion-proof valve 800. The bottom of the explosion-proof valve 800 is provided with explosion-proof grooves 801. The main function of the explosion-proof grooves 801 is to quickly release internal pressure in abnormal situations. The indentation design of the explosion-proof grooves 801 helps the explosion-proof valve 800 to evenly bear pressure and crack along the grooves, preventing fragments from damaging other components. In this application, the explosion-proof grooves 801 are built into the lower plastic part 500 to prevent it from being damaged by external forces.

[0069] Furthermore, the top cover plate 400 is provided with an explosion-proof through hole 404, which is located at the geometric center of the top cover plate 400. An annular explosion-proof first-level step 405 is provided on the side of the explosion-proof through hole 404 near the lower plastic part 500, and an annular explosion-proof second-level step 406 is provided on the side of the explosion-proof first-level step 405 near the lower plastic part 500. The center lines of the explosion-proof through hole 404, the explosion-proof first-level step 405, and the explosion-proof second-level step 406 coincide.

[0070] The explosion-proof first step 405 and explosion-proof second step 406 of this application form a space for installing the explosion-proof valve 800. The bottom of the top cover plate 400 needs to be fitted with a lower plastic part 500. The lower plastic part 500 is provided with a lower plastic explosion-proof through hole 506. By setting the explosion-proof first step 405 and explosion-proof second step 406, it can be ensured that the explosion-proof mark 801 is located inside the lower plastic explosion-proof through hole 506, avoiding the explosion-proof mark 801 being exposed to the outside of the cover plate structure and causing damage.

[0071] This application also includes an injection hole 407 in the top cover plate 400 for injecting electrolyte during the subsequent manufacturing process of the finished battery cell. A lower plastic injection through-hole 507 is also provided in the lower plastic part 500. The lower plastic injection through-hole 507 is located to the right of the lower plastic explosion-proof through-hole 506, and its function is to avoid obstructing the injection hole 407 while also providing protection for it.

[0072] Example 4

[0073] This application provides a cover assembly for a power battery, including a terminal post 100, a sealing ring 300, a cover structure, and an adapter plate 600. The cover structure includes an upper plastic part 200, a top cover sheet 400, and a lower plastic part 500.

[0074] Figure 1 and Figure 2 This is an exploded view and sectional view of the cover plate assembly. From top to bottom, they are: pole post 100, upper plastic part 200, sealing ring 300, top cover plate 400, lower plastic part 500, adapter plate 600, explosion-proof protective patch 700, and explosion-proof valve 800.

[0075] Figure 3This is a structural diagram of the top cover plate 400. Its main features include an upper plastic positioning groove 401, an annular flow-stopping groove 402, an explosion-proof through hole 404, a sealing fixing hole 403, an explosion-proof first-level step 405, an explosion-proof second-level step 406, and a liquid injection hole 407. The upper plastic positioning groove 401 is a square recessed platform in which the upper plastic part 200 is placed for its external positioning; the sealing fixing hole 403 is located at the geometric center of the upper plastic positioning groove 401 and is subsequently secured by a sealing ring; the annular flow-stopping groove 402 is located around the front periphery of the sealing fixing hole 403, and the sealing ring 300 cooperates with it to form an annular segmented snap-fit ​​structure. An explosion-proof through-hole 404 is located at the geometric center of the top cover plate 400 to ensure that the air pressure on the front of the explosion-proof valve is consistent with the environment and to facilitate the passage of the explosion-proof valve. An explosion-proof first-stage step 405 is located around the back of the explosion-proof through-hole 404. An explosion-proof second-stage step 406 is located on the explosion-proof first-stage step 405 and is concentric with it, for subsequent positioning and installation of the explosion-proof valve 800. An injection hole 407 is located on the right side of the explosion-proof through-hole 404 for injecting electrolyte during the subsequent manufacturing process of the finished battery cell.

[0076] Figure 4 This is a structural diagram of the electrode post 100. Its function is to conduct electricity and allow current flow, connecting the battery cell to an external conductor. Its main features include a cylindrical end 101, a square end 102, a riveting groove 103, a stress notch 104, and a center hole 105. The cylindrical end 101 passes successively through the upper plastic part 200, the sealing ring 300, the top cover 400, the lower plastic part 500, and the adapter plate 600. During riveting, the middle of the cylindrical end 101 expands laterally, compressing the sealing ring 800 to form a seal. The side of the cylindrical end away from the electrode post direction compresses the riveting hole 604 of the adapter plate 600, forming a fixation. The square end 102 fits against the inner side of the upper plastic part 200 during assembly and is fixed therein. The riveting groove 103 is a groove formed by pressing the end face of the cylindrical head of the electrode post during riveting. The cylindrical end flows outwards, increasing in diameter, thus sealing and fixing the overall component structure. The stress notch 104 is an annular notch located on the side of the cylindrical end 101 of the pole post near the square end 102 of the pole post. Its function is to improve the deformation of the side of the cylindrical end 101 of the pole post during riveting, so that the compression of the contact area with the sealing ring is more sufficient, thereby obtaining better sealing performance. The pole post center hole 105 is a circular hole located in the center of the square end 102 of the pole post. Its function is to be used for positioning when welding the finished cell pole post to the conductor busbar during subsequent battery pack manufacturing.

[0077] Figure 5This is a structural diagram of the upper plastic part 200. Its function is to wrap and support the pole 100 and form insulation with the top cover plate 400. Its main features include the upper plastic pole through hole 201 and the upper plastic positioning wall 202. The upper plastic pole through hole 201 is located at the center of the bottom of the upper plastic part 200, through which the cylindrical end 101 of the pole passes, forming a clearance fit with the upper end of the sealing ring 300; the upper plastic positioning wall 202 is located on the outer periphery of the upper plastic part, its outer side is fixed to the upper plastic positioning groove 401 on the top cover plate 300, and its inner side is attached to the back and side of the square end 102 of the pole 100, and is fixed after riveting.

[0078] Figure 6 The diagram shows the structure of the sealing ring 300. Its function is to seal the pole. The main body of the sealing ring 300 is annular, with a sealing pole through-hole 301 at its center. The cylindrical end 101 of the pole passes through this hole and fits tightly against its sidewall. The sealing ring buckle 302 is located on the outer circumference of the sealing ring and tightly engages with the annular stop groove 402 on the top cover plate 400. This effectively prevents the sealing ring from shrinking due to external force or aging, and also prevents the sealing ring 300 from rotating relative to the top cover plate 400, thus avoiding a decrease in sealing performance caused by the rotation of the sealing ring.

[0079] Figure 7 This is a structural diagram of the lower plastic part 500. Its function is to provide support and insulation. Key features include a transition positioning wall 501, a clearance notch 502, a positioning slot 503, a positioning reinforcing rib 504, a lower plastic electrode through-hole 505, a lower plastic explosion-proof through-hole 506, and a lower plastic injection through-hole 507. The transition positioning wall 501 is located on the left and right sides of the back of the lower plastic part 500, forming an interference fit with the transition plate 600 during assembly, securing the transition plate 600 within it. The clearance notch 502 is located on both sides of the transition positioning wall 501, and its shape matches the inner bend of the transition plate 600, preventing interference with the battery cell during manufacturing. The positioning slot 503 is located on both sides of the top center of the transition positioning wall 501, providing positioning for subsequent battery cell manufacturing. The positioning reinforcing rib 504 is located on one side of the top center of the transition positioning wall 501, and its shape matches the bend of the transition plate 600. The outer radius of the bend is consistent, which serves to improve the positioning effect of the adapter plate 600 and increase the strength of the positioning wall itself; the lower plastic pole through hole 505 is set on the left and right sides of the lower plastic plane, through which the sealing ring 300 passes and forms a clearance fit; the lower plastic explosion-proof through hole 506 is set at the geometric center of the lower plastic part 500, which serves to avoid the explosion-proof valve 800 and to protect the explosion-proof valve 800 from external damage; the lower plastic liquid injection through hole 507 is set on the right side of the explosion-proof through hole 506, which serves to avoid the liquid injection hole 407 of the top cover plate and to protect the liquid injection hole 407.

[0080] Figure 8This is a structural diagram of the adapter plate 600. Its function is to connect the electrode post and the battery cell. Key features include a welding slot 601, a small bend 602, a process notch 603, and an electrode post riveting hole 604. The welding slot 601 is located on the bend edge and will be welded to the battery cell connector later. The small bend 602 is located on both sides of the main plane edge to restrict the position of the battery cell in the width direction. The process notch 603, a U-shaped notch, is located next to the small bend 602 to facilitate bending. The electrode post riveting hole 604 is located in the center of the main plane, through which the cylindrical end 101 of the electrode post passes. During assembly, it is a clearance fit; during riveting, the cylindrical end 101 of the electrode post expands locally around its circumference, compressing and fixing the electrode post riveting hole 604.

[0081] Figure 9 This is an assembly diagram of the adapter plate 600 and the lower plastic part 500.

[0082] Figure 10 The diagram illustrates the changes in the state of the pole post 100 before and after riveting. The bottom surface of the cylindrical end of the pole post is compressed, forming a riveting groove 103. Excess material expands outwards, compressing the pole post riveting hole 604 and the sealing ring 300 of the adapter plate 600. Due to the obstruction of the stress notch, the deformation area 106 of the pole post is mainly located below the stress notch 104 on the side of the cylindrical end 101 of the pole post; there is no significant deformation at the root of the cylindrical end 101 of the pole post.

[0083] The cover plate assembly process described in this patent is as follows: ① Place the explosion-proof valve 800 on the explosion-proof second-level step 406 on the back of the top cover plate 400 and weld it in place; ② Fix the sealing ring 300 to the two sealing fixing holes 403 on the top cover plate 400 through the sealing ring buckle; ③ After the two pole pieces 100 are installed into the upper plastic part 200, they are inserted into the inner ring of the sealing ring 300 to form an interference fit, ensuring that the pole pieces 100 will not fall off freely; ④ Turn the above components over so that the back of the components are facing up, and put the lower plastic part 500 on the outer ring of the back of the sealing ring 300 through the two pole through holes 505 to form a relative position fixation; ⑤ Then press the two adapter plates 600 together. Figure 9 The adapter positioning wall 501 on the back of the lower plastic part 500 is shown to form an interference fit, ensuring that the adapter plate 600 will not wobble; ⑥ With the back of the above components facing up, the two pole areas are riveted to complete the overall fastening and sealing; ⑦ The pole areas of the components are welded to further reinforce and seal them; ⑧ The explosion-proof protective patch 700 is attached above the explosion-proof through hole 404 on the front of the top cover plate 400, thus completing the assembly of this cover plate assembly.

[0084] In this embodiment, an annular stop groove is provided in the sealing and fixing hole of the top cover plate, which cooperates with the sealing ring buckle on the inner side of the sealing ring to prevent the sealing ring from shrinking inward after injection molding. The segmented buckle structure effectively prevents the sealing ring from rotating relative to the top cover plate.

[0085] In this embodiment, the explosion-proof through hole of the top cover is provided with a two-stage countersunk head, specifically a first-stage explosion-proof step and a second-stage explosion-proof step set concentrically, so that the explosion-proof valve scoring position does not protrude from the bottom surface of the lower plastic part, thus avoiding external damage.

[0086] In this embodiment, a stress notch is provided at the top of the cylindrical end of the pole post to improve the defect of uncontrollable pole post deformation after riveting, thereby enhancing the firmness of the connection between the pole post and the adapter plate and the top cover plate, and improving the sealing performance of the sealing ring after riveting.

[0087] In this embodiment, three-directional transition positioning walls are provided at both ends of the back of the lower plastic part to restrict the position and orientation of the transition plate; and ribs are provided on the side plates at both ends of the lower plastic part to increase the support strength.

[0088] This application also provides a power battery, including the cover assembly described above.

[0089] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0090] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0091] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0092] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cover plate assembly for a power battery, characterized in that, The device includes a pole post (100), a sealing ring (300), a cover plate structure, and a transition plate (600). The cover plate structure has a through hole for placing the pole post. The pole post includes a square end (102) and a cylindrical end (101). The cross-sectional area of ​​the square end (102) is larger than the cross-sectional area of ​​the cylindrical end (101). A stress notch (104) is provided at the junction of the square end (102) and the cylindrical end (101) around the outer periphery of the cylindrical end (101). The square end (102) of the pole post is snapped into the top of the pole post placement through hole, and the cylindrical end (101) of the pole post passes through the pole post placement through hole and abuts against the adapter plate (600); the sealing ring (300) is provided between the cylindrical end (101) of the pole post and the pole post placement through hole.

2. The cover plate assembly for a power battery according to claim 1, characterized in that, An arc-shaped chamfer is provided at the connection between the cylindrical end (101) and the square end (102) of the pole post, and the stress notch (104) is located on the side of the cylindrical end (101) of the pole post close to the arc-shaped chamfer.

3. The cover plate assembly for a power battery according to claim 1, characterized in that, The cover plate structure includes an upper plastic part (200), a top cover plate (400), and a lower plastic part (500) arranged sequentially. The upper plastic part (200) is provided with an upper plastic electrode through hole (201), the top cover plate (400) is provided with a sealing and fixing hole (403), and the lower plastic part (500) is provided with a lower plastic electrode through hole (505). The center lines of the upper plastic electrode through hole (201), the sealing and fixing hole (403), and the lower plastic electrode through hole (505) coincide. The sealing ring (300) is fixed in the sealing and fixing hole (403), and the cylindrical end (101) of the electrode passes through the upper plastic electrode through hole (201), the sealing and fixing hole (403), and the lower plastic electrode through hole (505) in sequence.

4. The cover plate assembly for a power battery according to claim 3, characterized in that, The inner wall of the sealing fixing hole (403) is provided with M annular flow-stopping grooves (402); the M annular flow-stopping grooves (402) are distributed circumferentially along the inner wall of the sealing fixing hole (403); the outer wall of the sealing ring (300) is provided with M sealing annular buckles (302) that are adapted to the annular flow-stopping grooves (402); M is an integer greater than 0.

5. A cover plate assembly for a power battery according to claim 3, characterized in that, The bottom of the lower plastic part (500) is press-fitted with the adapter plate (600). The adapter plate (600) is provided with a pole post riveting hole (604). The center line of the pole post riveting hole (604) coincides with the center line of the lower plastic pole post through hole (505). The cylindrical end (101) of the pole post is located inside the pole post riveting hole (604).

6. A cover plate assembly for a power battery according to claim 5, characterized in that, The lower plastic part (500) has a positioning reinforcing rib (504) on its top side, and the edge of the adapter plate (600) has an R-angle. The shape of the positioning reinforcing rib (504) is adapted to the shape of the R-angle in the adapter plate (600).

7. A cover plate assembly for a power battery according to claim 5, characterized in that, The bottom side of the lower plastic part (500) is provided with a transition positioning wall (501), and the transition positioning wall (501) is interference-fitted with the transition plate (600).

8. A cover plate assembly for a power battery according to claim 1, characterized in that, The electrode post includes a positive electrode post and a negative electrode post, and the electrode post placement through hole includes a positive electrode post placement through hole and a negative electrode post placement through hole.

9. A cover plate assembly for a power battery according to claim 3, characterized in that, The cover plate assembly also includes an explosion-proof valve (800). The cover plate structure is provided with an explosion-proof placement through hole for placing the explosion-proof valve (800). The bottom of the explosion-proof valve (800) is provided with an explosion-proof groove (801), which is located inside the lower plastic part (500).

10. A cover plate assembly for a power battery according to claim 9, characterized in that, An explosion-proof through hole (404) is provided in the top cover plate (400). The explosion-proof through hole (404) is located at the geometric center of the top cover plate (400). An annular explosion-proof first step (405) is provided on the side of the explosion-proof through hole (404) near the lower plastic part (500). An annular explosion-proof second step (406) is provided on the side of the explosion-proof first step (405) near the lower plastic part (500). The center lines of the explosion-proof through hole (404), the explosion-proof first step (405) and the explosion-proof second step (406) coincide.

11. A power battery, characterized in that, Includes a cover assembly for a power battery as described in any one of claims 1-10.

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