Riveting top cover, battery cell cover plate and battery cell

Abstract

The invention relates to the technical field of batteries, and discloses a riveting top cover, a battery cell cover plate and a battery cell. Wherein the riveting top cover comprises a riveting block and a pole column, the riveting block is provided with a through hole, the through hole comprises a matching hole, a secondary riveting hole and a main riveting hole which are coaxially arranged in sequence, the pole column comprises a base and a protruding part arranged on the base, the protruding part is provided with a matching section, a secondary riveting section and a main riveting section which are in one-to-one correspondence with the matching hole, the secondary riveting hole and the main riveting hole, and the matching section, the secondary riveting section and the main riveting section are in one-to-one correspondence with the matching hole, the secondary riveting hole and the main riveting hole. The first annular cavity is reserved between the secondary riveting section and the secondary riveting hole in the pre-assembly state, the second annular cavity is reserved between the main riveting section and the main riveting hole, and the first annular cavity and the second annular cavity respectively reserve material expansion spaces for the secondary riveting section and the main riveting section. Therefore, part of the first annular cavity can be filled with the secondary riveting section after the secondary riveting section expands under the action force, the phenomenon that the riveting block is locally expanded or deformed due to expansion of the secondary riveting section in the traditional riveting process is avoided, and the yield of the riveted top cover is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a riveted top cover, a battery cover plate and a battery cell. Background Art

[0002] As new energy battery technology becomes increasingly mature, the cell cover is a key component in the battery cell. Its functions are to be welded with the shell to form a sealed cavity, to lead out the positive and negative electrodes of the electrode group, and to serve as an assembly carrier.

[0003] In the prior art, such as Figures 1 to 8 As shown, the conventional riveted top cover mainly includes a rivet block 1', an upper plastic 2', a conductive electrode column 3', a cover plate 4', a lower plastic 5' and a sealing member 6'. The rivet block 1' is provided with a rivet through hole 101' corresponding to the conductive electrode column 3', and the conductive electrode column 3' is inserted into the rivet through hole 101' and fixed to the rivet block 1' by riveting. However, during the stamping process, the main rivet area 7' of the conductive electrode column 3' is compressed and expanded, and at the same time, this stamping force is transmitted to the secondary rivet area 8' of the conductive electrode column 3', causing the secondary rivet area 8' of the conductive electrode column 3' to expand accordingly. Due to the clearance fit between the secondary rivet area 8' of the conductive electrode column 3' and the rivet through hole 101', when the secondary rivet area 8' expands, the conductive electrode column 3' will apply a force to the secondary rivet area 8' of the rivet through hole 101', thereby causing the rivet block 1' to be partially enlarged or deformed. This deformation phenomenon reduces the yield rate of the riveted top cover and affects the quality and reliability of the product. Summary of the invention

[0004] In view of this, the present invention provides a riveted top cover, a battery cover plate and a battery cell to solve the problem of local expansion or deformation of the riveted block during the riveting process of the riveted block and the pole.

[0005] In a first aspect, the present invention provides a riveted top cover, comprising: The riveting block is provided with a through hole, wherein the through hole comprises a matching hole, a secondary riveting hole and a main riveting hole which are coaxially arranged in sequence; A pole, comprising a base and a raised portion arranged on the base, the raised portion being provided with a matching section, a secondary riveting section and a main riveting section corresponding to the matching hole, the secondary riveting hole and the main riveting hole one by one, the raised portion being suitable for penetrating into the through hole, the outer wall of the matching section being gap-matched with the hole wall of the matching hole, the pole and the riveting block being in a pre-assembled state and a riveted state; In the pre-assembled state, the protrusion is inserted into the through hole, a first annular cavity is left between the outer wall of the secondary riveting section and the hole wall of the secondary riveting hole, and a second annular cavity is left between the outer wall of the main riveting section and the hole wall of the main riveting hole; In the riveted state, the main riveted section is expanded by the force to fill the second annular cavity, and the secondary riveted section is expanded by the force to fill the first annular cavity.

[0006] Beneficial effect: When installing the pole and the riveted block, the protruding portion of the pole is first inserted into the through hole of the riveted block. Due to the clearance fit between the mating section of the protruding portion and the mating hole of the through hole, the pole and the riveted block can be accurately assembled and positioned in the pre-assembly state, which is convenient for subsequent riveting operations. When riveting the pole and the riveted block, a riveting force is applied to the end of the main riveted section. Since a first annular cavity is left between the secondary riveted section and the secondary riveted hole in the pre-assembly state, and a second annular cavity is left between the main riveted section and the main riveted hole, the first annular cavity and the second annular cavity respectively leave expansion space for the secondary riveted section and the main riveted section. Therefore, after the secondary riveted section is expanded by the force, it will fill part of the first annular cavity, avoiding the local expansion or deformation of the riveted block caused by the expansion of the secondary riveted section in the traditional riveting process, thereby improving the yield rate of the riveted top cover. At the same time, the expansion of the main riveted section and the secondary riveted section fills the second annular cavity and the first annular cavity respectively, ensuring a firm mechanical connection between the pole and the riveted block, and providing a good sealing effect to prevent electrolyte leakage.

[0007] In an optional embodiment, the aperture of the main riveting hole is d1, the diameter of the main riveting section is d1', the aperture of the secondary riveting hole is d2, the diameter of the secondary riveting section is d2', the width of the second annular cavity is d1-d1', the width of the first annular cavity is d2-d2', and the ratio of the first annular cavity to the second annular cavity is θ, satisfying 30%≤θ=(d2-d2') / (d1-d1')≤50%.

[0008] Beneficial effect: By setting a reasonable ring width ratio, the first annular cavity is guaranteed to have sufficient space for material expansion, and the pole has little effect on the local expansion or deformation of the riveted block during the expansion process, so that the width of the riveted block is within the tolerance range, thereby reducing the risk of deformation and improving the product yield. At the same time, it does not affect the resistance value between the riveted block and the pole. Ensure that the width of the riveted area of ​​the riveted block is within the normal tolerance range (±0.15mm), and the resistance between the pole and the riveted block meets the use requirements (≤0.035mΩ).

[0009] In an optional embodiment, the diameter of the matching hole is d3, the diameter of the matching section is d3', and the relationship coefficient between the diameter of the matching hole and the diameter of the matching section is (d3-d3') / d3', satisfying 0.01≤(d3-d3') / d3'≤0.02.

[0010] Beneficial effect: By setting the aperture relationship between the matching hole and the matching section within an appropriate range, it is ensured that the symmetry of the riveted block relative to the center of the top cover after riveting meets the requirements.

[0011] In an optional implementation, the diameter of the main riveting hole is d1, and the diameter of the main riveting section is d1', satisfying d1-d1'≥0.8 mm.

[0012] Beneficial effect: The relationship between the diameter of the main riveting hole and the diameter of the main riveting section is set to meet d1-d1'≥0.8mm, ensuring that the main riveting section can fully fill the second annular cavity when it expands under force, forming a stronger mechanical connection, so that the torque and thrust of the pole and the riveting block after riveting meet the requirements, which can ensure that the battery cell and the bus are firmly welded, and then the riveting block of the battery pack will not fall off under large vibration impact.

[0013] In an optional embodiment, the diameter of the secondary riveting hole is larger than the diameter of the primary riveting section.

[0014] Beneficial effect: Since the diameter of the secondary riveting hole is larger than the diameter of the main riveting section, the pole can pass through the riveting block more easily, which facilitates the installation of the pole and the riveting block, avoids the pole from being subjected to large resistance during assembly, and also prevents the pole and the riveting block from being deformed due to the assembly resistance during assembly.

[0015] In an optional embodiment, the ratio of the hole depth of the primary riveting hole to the hole depth of the secondary riveting hole is 35%-55%, and / or the ratio of the hole depth of the matching hole to the hole depth of the secondary riveting hole is 25%-35%.

[0016] Beneficial effect: By setting appropriate hole depths for the matching holes, secondary rivet holes and main rivet holes, the torque and thrust of the pole and the rivet block after riveting meet the requirements, which can ensure that the battery cell and the busbar are welded firmly, and the rivet block of the battery pack will not fall off under large vibration impact.

[0017] In an optional embodiment, the through hole further includes a welding groove, which is arranged on a side of the main riveting hole away from the secondary riveting hole and located at an end of the through hole, and the aperture of the welding groove is larger than the aperture of the main riveting hole.

[0018] Beneficial effect: Since a welding groove is provided on one side of the main riveting hole, the welding groove provides sufficient space for welding the main riveting section, ensuring good contact between the pole and the riveting block during welding, helping to improve the sealing performance of the welding part, preventing electrolyte leakage, and ensuring the safety and reliability of the product.

[0019] The aperture of the welding groove is larger than that of the main riveting hole, which provides a wider welding area for the welding of the main riveting section, enhances the connection strength between the pole and the riveting block, helps to improve the stability of the overall structure, and reduces loosening or deformation caused by vibration or external force during use.

[0020] In an optional embodiment, the protrusion also includes a mounting section, the mounting section is arranged between the mating section and the base, the diameter of the mounting section is larger than the diameter of the mating section, and the outer wall of the mounting section is suitable for sleeve-mounting a sealing ring.

[0021] Beneficial effect: The mounting section is arranged on the raised portion, and the sealing ring is sleeved on the outer wall of the mounting section, which can effectively improve the sealing performance between the pole and the riveted block, prevent electrolyte leakage, and ensure the safety and reliability of the product.

[0022] In a second aspect, the present invention further provides a battery cell cover, comprising: The cover plate body is provided with a mounting hole; The riveted top cover, the through hole and the mounting hole are coaxially arranged, the protrusion is sequentially penetrated into the mounting hole and the through hole, and the cover body, the riveted block and the pole are fixedly connected by riveting.

[0023] Beneficial effect: When installing the cell cover, the raised portion of the pole is inserted into the mounting hole and the through hole in turn. Due to the clearance fit between the mating section of the raised portion and the mating hole of the through hole, the pole and the rivet block can be accurately assembled and positioned in the pre-assembly state, which is convenient for subsequent riveting operations. When riveting the pole and the rivet block, a riveting force is applied to the end of the main riveting section. Since a first annular cavity is left between the secondary riveting section and the secondary riveting hole in the pre-assembly state, and a second annular cavity is left between the main riveting section and the main riveting hole, the first annular cavity and the second annular cavity respectively leave expansion space for the secondary riveting section and the main riveting section. Therefore, after the secondary riveting section is expanded by the force, it will fill part of the first annular cavity, avoiding the local expansion or deformation of the rivet block caused by the expansion of the secondary riveting section in the traditional riveting process, thereby improving the yield rate of the riveted top cover.

[0024] In a third aspect, the present invention further provides a battery cell, comprising: case; A cell cover plate, wherein the cell cover plate is fixedly connected to the shell.

[0025] Beneficial effect: Since the battery cell includes a battery cell cover plate, it has the same effect as the battery cell cover plate structure, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is an exploded schematic diagram of an existing riveted top cover; Figure 2 It is the front view of the existing riveted top cover; Figure 3 It is the front view of the pole in the existing riveted top cover; Figure 4 It is a cross-sectional view of a pole in an existing riveted top cover; Figure 5 It is a front view of a riveting block in an existing riveted top cover; Figure 6 It is a cross-sectional view of a riveting block in an existing riveted top cover; Figure 7 It is a partial cross-sectional view of an existing riveted top cover before riveting; Figure 8 It is a partial cross-sectional view of the existing riveted top cover after riveting; Fig. 9 It is a front view of a riveted block in a riveted top cover according to an embodiment of the present invention; Fig.10 A cross-sectional view of a riveted block in a riveted top cover according to an embodiment of the present invention; Fig.11 A front view of a pole in a riveted top cover according to an embodiment of the present invention; Fig.12 A cross-sectional view of a pole in a riveted top cover according to an embodiment of the present invention; Fig.13 It is a front view of a riveted top cover according to an embodiment of the present invention; Fig.14 A partial cross-sectional view of a riveted top cover before riveting according to an embodiment of the present invention; Fig.15 It is a partial cross-sectional view of a riveted top cover after riveting according to an embodiment of the present invention.

[0028] Description of reference numerals: Prior art reference numerals: 1', rivet block; 101', riveting through hole; 2', upper plastic; 3', conductive electrode column; 4', cover plate; 5', lower plastic; 6', sealing member; 7', primary riveting area; 8', secondary riveting area.

[0029] Reference numerals of the present invention: 1. Riveting block; 101. Through hole; 1011. Matching hole; 1012. Secondary riveting hole; 1013. Main riveting hole; 1014. Welding groove; 2. Upper plastic part; 3. Pole; 301. Base; 302. Raised portion; 3021. Matching section; 3022. Secondary riveting section; 3023. Main riveting section; 3024. Installation section; 303. First annular cavity; 304. Second annular cavity; 4. Cover body; 5. Lower plastic part; 6. Sealing ring. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] In related technologies, such as Figures 1 to 8 As shown, the conventional riveted top cover mainly includes a rivet block 1', an upper plastic 2', a conductive electrode column 3', a cover plate 4', a lower plastic 5' and a sealing member 6'. The rivet block 1' is provided with a rivet through hole 101' corresponding to the conductive electrode column 3', and the conductive electrode column 3' is inserted into the rivet through hole 101' and fixed to the rivet block 1' by riveting. However, during the stamping process, the main rivet area 7' of the conductive electrode column 3' is compressed and expanded, and at the same time, this stamping force is transmitted to the secondary rivet area 8' of the conductive electrode column 3', causing the secondary rivet area 8' of the conductive electrode column 3' to expand accordingly. Due to the clearance fit between the secondary rivet area 8' of the conductive electrode column 3' and the rivet through hole 101', when the secondary rivet area 8' expands, the conductive electrode column 3' will apply a force to the secondary rivet area 8' of the rivet through hole 101', thereby causing the rivet block 1' to be partially enlarged or deformed. This deformation phenomenon reduces the yield rate of the riveted top cover and affects the quality and reliability of the product.

[0032] In order to solve the above technical problems, the following Figures 9 to 15 , describing an embodiment of the present invention.

[0033] According to an embodiment of the present invention, on the one hand, Figures 9 to 15 As shown, a riveted top cover is provided, comprising a riveted block 1 and a pole 3 .

[0034] Specifically, Fig. 9 and Fig.10 As shown, a through hole 101 is opened on the riveting block 1, wherein the through hole 101 includes a matching hole 1011, a secondary riveting hole 1012 and a main riveting hole 1013, wherein the matching hole 1011, the secondary riveting hole 1012 and the main riveting hole 1013 are coaxially arranged in sequence.

[0035] Specifically, Fig.11 and Fig.12 As shown, the pole 3 includes a base 301 and a protrusion 302, and the protrusion 302 is arranged on the base 301. The protrusion 302 is provided with a matching section 3021, a secondary riveting section 3022 and a main riveting section 3023 in sequence, and the matching section 3021, the secondary riveting section 3022 and the main riveting section 3023 are respectively arranged in a one-to-one correspondence with the matching hole 1011, the secondary riveting hole 1012 and the main riveting hole 1013.

[0036] Specifically, Figures 9 to 15 As shown, the protrusion 302 is suitable for penetrating into the through hole 101 , wherein the outer wall of the matching section 3021 is gap-matched with the hole wall of the matching hole 1011 , and the pole 3 and the riveting block 1 are in a pre-assembled state and a riveted state.

[0037] In the pre-assembled state, combined Figures 9 to 14 As shown, the protrusion 302 is penetrated in the through hole 101, a first annular cavity 303 is left between the outer wall of the secondary riveting section 3022 and the hole wall of the secondary riveting hole 1012, and a second annular cavity 304 is left between the outer wall of the main riveting section 3023 and the hole wall of the main riveting hole 1013.

[0038] In the riveted state, the combination Fig. 9 and Fig.15 As shown, the primary riveting section 3023 expands under the force to fill the second annular cavity 304 , and the secondary riveting section 3022 expands under the force to fill the first annular cavity 303 .

[0039] When installing the pole 3 and the riveted block 1, the protrusion 302 of the pole 3 is first inserted into the through hole 101 of the riveted block 1. Due to the clearance fit between the matching section 3021 of the protrusion 302 and the matching hole 1011 of the through hole 101, it is ensured that the pole 3 and the riveted block 1 can be accurately assembled and positioned in the pre-assembly state, so as to facilitate the subsequent riveting operation. When the pole 3 and the riveting block 1 are riveted, a riveting force is applied to the end of the main riveting section 3023. Since a first annular cavity 303 is left between the secondary riveting section 3022 and the secondary riveting hole 1012 in the pre-assembled state, and a second annular cavity 304 is left between the main riveting section 3023 and the main riveting hole 1013, the first annular cavity 303 and the second annular cavity 304 are respectively provided with expansion space for the secondary riveting section 3022 and the main riveting section 3023. Therefore, after the secondary riveting section 3022 is expanded by the force, it will fill part of the first annular cavity 303, thereby avoiding the local expansion or deformation of the riveting block 1 caused by the expansion of the secondary riveting section 3022 in the traditional riveting process, thereby improving the yield rate of the riveted top cover. At the same time, the expansion of the primary riveted section 3023 and the secondary riveted section 3022 fills the second annular cavity 304 and the first annular cavity 303 respectively, ensuring a firm mechanical connection between the pole 3 and the riveted block 1 and providing a good sealing effect to prevent electrolyte leakage.

[0040] Specifically, the aperture of the mating hole 1011 may be larger than the aperture of the secondary rivet hole 1012, the aperture of the secondary rivet hole 1012 may be larger than the aperture of the main rivet hole 1013, the height of the mating hole 1011 may be smaller than the height of the secondary rivet hole 1012. In the embodiment of the present application, no specific restrictions are imposed on the sizes of the mating hole 1011, the secondary rivet hole 1012 and the main rivet hole 1013, and an adaptive design can be performed according to actual usage requirements.

[0041] Specifically, the matching hole 1011, the secondary rivet hole 1012 and the main rivet hole 1013 can be set to be a circular hole, a square hole, etc. In the embodiment of the present application, there is no specific restriction on the shapes of the matching hole 1011, the secondary rivet hole 1012 and the main rivet hole 1013.

[0042] Specifically, the base 301 can be set to any existing shape such as a plate shape, a block shape, etc. In the embodiment of the present application, the shape of the base 301 is not specifically limited.

[0043] Specifically, the volume of the first annular cavity 303 can be set according to the expansion of the secondary riveting section 3022, and the volume of the second annular cavity 304 can be set according to the expansion of the main riveting section 3023. In the embodiment of the present application, no specific restrictions are imposed on the volumes of the first annular cavity 303 and the second annular cavity 304.

[0044] In one embodiment, Fig.14 As shown, the width of the second annular cavity 304 is greater than the width of the first annular cavity 303 .

[0045] The width of the second annular cavity 304 is greater than that of the first annular cavity 303, providing a larger expansion space for the main riveting section 3023, ensuring that the second annular cavity 304 can be fully filled when the force is expanded, forming a more solid mechanical connection. The expansion of the main riveting section 3023 fills the second annular cavity 304. Since the width of the second annular cavity 304 is larger, the mechanical locking structure formed is more stable, and the connection strength between the pole 3 and the riveting block 1 is enhanced. At the same time, the pole 3 has little effect on the local expansion or deformation of the riveting block 1 during the expansion process, thereby reducing the risk of deformation and improving the product yield.

[0046] In one embodiment, the width of the second annular cavity 304 is d1-d1', the width of the first annular cavity 303 is d2-d2', and the ratio of the first annular cavity 303 to the second annular cavity 304 is θ, satisfying 30%≤θ=(d2-d2') / (d1-d1')≤50%.

[0047] By setting a reasonable ring width ratio, the first annular cavity 303 is guaranteed to have sufficient expansion space, and the pole 3 has little effect on the local expansion or deformation of the riveted block 1 during the expansion process, so that the width of the riveted block 1 is within the tolerance range, thereby reducing the risk of deformation and improving the product yield. At the same time, it does not affect the resistance value between the riveted block 1 and the pole 3. Ensure that the width of the riveted area of ​​the riveted block 1 is within the normal tolerance range (±0.15mm), and the resistance between the pole 3 and the riveted block 1 meets the use requirements (≤0.035mΩ).

[0048] It should be noted that the ring width refers to the width between two circular rings, that is, the difference between the outer diameter of the larger circular ring and the inner diameter of the smaller circular ring. d1 is the aperture of the main riveting hole 1013, d1' is the diameter of the main riveting section, d2 is the aperture of the secondary riveting hole 1012, and d2' is the diameter of the secondary riveting section 3022.

[0049] Case 1: d1, d1', d2 are set to 7mm, 6mm, 6.1mm, and different widths of the first annular cavity 303 are set by selecting different d2', and the width of the riveting expansion area B = 12mm (such as Fig.13 After riveting, measure the width and resistance:

[0050] It can be inferred from Case 1 that when the ratio of the ring width of the first annular cavity 303 to the ring width of the second annular cavity 304 is 30%-50%, the cover plate meets the specified size and resistance requirements.

[0051] Case 2: d1, d1', d2 are fixed values ​​of 10mm, 8.5mm, 8.6mm, and by selecting different d2' to set different widths of the first annular cavity 303, the width of the riveting expansion area B = 15mm (such as Fig.13 As shown), after riveting, measure the width pole resistance:

[0052] It can be inferred from the second case that when the ratio of the width of the first annular cavity 303 to the width of the second annular cavity 304 is 30%-50%, the cover plate meets the specified size and resistance requirements.

[0053] Case 3: d1, d1', d2 are fixed values ​​of 8mm, 6.9mm, 7mm, and by selecting different d2' to set different ring widths of the first annular cavity 303, the width of the riveting expansion area B = 14mm (such as Fig.13 As shown), after riveting, measure the width pole resistance:

[0054] It can be inferred from Case 3 that when the ratio of the width of the first annular cavity 303 to the width of the second annular cavity 304 is 30%-50%, the cover plate meets the specified size and resistance requirements.

[0055] In one embodiment, the relationship coefficient between the diameter of the matching hole 1011 and the diameter of the matching section 3021 is (d3-d3') / d3', satisfying 0.01≤(d3-d3') / d3'≤0.02.

[0056] By setting the diameter relationship between the matching hole 1011 and the matching section 3021 within an appropriate range, it is ensured that the symmetry of the riveting block 1 after riveting with respect to the center of the top cover meets the requirement of 0.15.

[0057] It should be noted that d3 is the hole diameter of the matching hole 1011 , and d3 ′ is the diameter of the matching section 3021 .

[0058] Design different diameters d3 of the matching holes 1011, match and rivet with the fixed matching sections 3021 respectively, and check the symmetry of the riveted blocks: Case 4: d3'=7, different d3 values ​​correspond to the symmetry of the riveted block:

[0059] It can be seen from Case 4 that when 0.01≤(d3-d3') / d3'≤0.02, the cover plate use requirements are met.

[0060] Case 5: d3'=8, different d3 values ​​correspond to the symmetry of riveted block 1:

[0061] It can be seen from Case 5 that when 0.01≤(d3-d3') / d3'≤0.02, the cover plate use requirements are met.

[0062] Case 6: d3'=10, different d3 values ​​correspond to the symmetry of riveted block 1:

[0063] It can be seen from Case 6 that when 0.01≤(d3-d3') / d3'≤0.02, the cover plate use requirements are met.

[0064] In one embodiment, the diameter of the main riveting hole 1013 is d1, and the diameter of the main riveting section 3023 is d1′, satisfying d1-d1′≥0.8 mm.

[0065] The relationship between the aperture of the main riveting hole 1013 and the diameter of the main riveting section 3023 is set to satisfy d1-d1'≥0.8mm, ensuring that the main riveting section 3023 can fully fill the second annular cavity 304 when expanded under force, forming a stronger mechanical connection, so that the torque and thrust of the pole 3 and the riveting block 1 after riveting meet the requirements, which can ensure that the battery cell and the bus are firmly welded, and then the battery pack will not fall off the riveting block 1 under large vibration impact.

[0066] If the difference between the diameter of the main riveting hole 1013 and the diameter of the main riveting section 3023 is less than 0.8 mm, the expansion space of the main riveting section 3023 is relatively small, which may easily lead to loose riveting between the pole 3 and the riveting block 1 .

[0067] In one embodiment, the diameter of the secondary rivet hole 1012 is larger than the diameter of the primary rivet section 3023 .

[0068] Since the diameter of the secondary riveting hole 1012 is larger than the diameter of the primary riveting section 3023, the pole 3 can pass through the riveting block 1 more easily, which facilitates the installation of the pole 3 and the riveting block 1 and avoids the pole 3 from being subjected to large resistance during assembly. At the same time, it also prevents the pole 3 and the riveting block 1 from being deformed due to the assembly resistance during assembly.

[0069] In one embodiment, the ratio of the hole depth of the primary rivet hole 1013 to the hole depth of the secondary rivet hole 1012 is 35%-55%, and / or the ratio of the hole depth of the matching hole 1011 to the hole depth of the secondary rivet hole 1012 is 25%-35%.

[0070] By setting appropriate hole depths for the matching hole 1011, the secondary rivet hole 1012 and the main rivet hole 1013 respectively, the torque and thrust of the pole 3 and the rivet block 1 after riveting meet the requirements, which can ensure that the battery cell and the bus are firmly welded, and the rivet block 1 of the battery pack will not fall off under large vibration impact.

[0071] In one embodiment, the through hole 101 further includes a welding groove 1014, which is disposed on a side of the primary rivet hole 1013 away from the secondary rivet hole 1012 and located at an end of the through hole 101. The diameter of the welding groove 1014 is larger than that of the primary rivet hole 1013.

[0072] Since a welding groove 1014 is provided on one side of the main riveting hole 1013, the welding groove 1014 provides sufficient space for welding the main riveting section 3023, ensuring good contact between the pole 3 and the riveting block 1 during the welding process, helping to improve the sealing performance of the welding part, preventing electrolyte leakage, and ensuring the safety and reliability of the product.

[0073] The aperture of the welding groove 1014 is larger than the aperture of the main riveting hole 1013, providing a wider welding area for the welding of the main riveting section 3023, enhancing the connection strength between the pole 3 and the riveting block 1, helping to improve the stability of the overall structure, and reducing loosening or deformation caused by vibration or external force during use.

[0074] In one embodiment, Fig.12 As shown, the protrusion 302 further includes a mounting section 3024, which is disposed between the matching section 3021 and the base 301. The diameter of the mounting section 3024 is greater than the diameter of the matching section 3021, and the outer wall of the mounting section 3024 is suitable for sleeve-mounting the sealing ring 6.

[0075] The mounting section 3024 is provided on the raised portion 302 , and the sealing ring 6 is sleeved on the outer wall of the mounting section 3024 , which can effectively improve the sealing performance between the pole 3 and the riveted block 1 , prevent electrolyte leakage, and ensure the safety and reliability of the product.

[0076] Specifically, a chamfer may be provided at the end of the mounting section 3024 to facilitate the sealing ring 6 to be sleeved on the mounting section 3024 .

[0077] According to an embodiment of the present invention, on the other hand, a cell cover is provided, comprising a cover body 4 and a riveted top cover.

[0078] Specifically, Fig.14 and Fig.15 As shown, a mounting hole is provided on the cover body 4.

[0079] Specifically, Fig.14 and Fig.15 As shown, the through hole 101 on the riveting block 1 is coaxially arranged with the mounting hole, the protrusion 302 is sequentially penetrated into the mounting hole and the through hole 101, and the cover body 4, the riveting block 1 and the pole 3 are fixedly connected by riveting.

[0080] When installing the cell cover, the protrusion 302 of the pole 3 is inserted into the installation hole and the through hole 101 in sequence. Due to the clearance fit between the matching section 3021 of the protrusion 302 and the matching hole 1011 of the through hole 101, it is ensured that the pole 3 and the rivet block 1 can be accurately assembled and positioned in the pre-assembly state to facilitate the subsequent riveting operation. When the pole 3 and the riveting block 1 are riveted, a riveting force is applied to the end of the main riveting section 3023. Since a first annular cavity 303 is left between the secondary riveting section 3022 and the secondary riveting hole 1012 in the pre-assembled state, and a second annular cavity 304 is left between the main riveting section 3023 and the main riveting hole 1013, the first annular cavity 303 and the second annular cavity 304 are respectively provided with expansion space for the secondary riveting section 3022 and the main riveting section 3023. Therefore, after the secondary riveting section 3022 is expanded by the force, it will fill part of the first annular cavity 303, thereby avoiding the local expansion or deformation of the riveting block 1 caused by the expansion of the secondary riveting section 3022 in the traditional riveting process, thereby improving the yield rate of the riveted top cover.

[0081] Specifically, Fig.14 and Fig.15 As shown, the cell cover also includes an upper plastic part 2 and a lower plastic part 5 , which are also provided with mounting holes for the protrusion 302 to pass through, wherein the upper plastic part 2 and the lower plastic part 5 are respectively arranged on both sides of the cover body 4 .

[0082] The steps for installing the cell cover in this embodiment are described as follows: like Fig.14 and Fig.15 As shown, the upper plastic part 2 is arranged on the upper side of the cover plate, the lower plastic part 5 is arranged on the lower wall of the cover plate, the riveting block 1 is installed in the upper plastic part 2, and it is ensured that the installation hole and the through hole 101 are located on the same axis.

[0083] like Figures 9 to 15 As shown, the sealing ring 6 is sleeved on the outer wall of the mounting section 3024 of the protrusion 302, and then the protrusion 302 is successively inserted into the mounting hole and the through hole 101, so that the matching section 3021 of the protrusion 302 and the matching hole 1011 of the through hole 101 are clearance-matched. A riveting force is then applied to the end of the main riveting section 3023. Since a first annular cavity 303 is left between the secondary riveting section 3022 and the secondary riveting hole 1012 in the pre-assembled state, and a second annular cavity 304 is left between the main riveting section 3023 and the main riveting hole 1013, the first annular cavity 303 and the second annular cavity 304 are respectively provided with expansion space for the secondary riveting section 3022 and the main riveting section 3023. Therefore, after the secondary riveting section 3022 expands under the force, it will fill part of the first annular cavity 303, thereby avoiding the local expansion or deformation of the riveting block 1 caused by the expansion of the secondary riveting section 3022 in the traditional riveting process, thereby improving the yield rate of the riveted top cover.

[0084] After the pole 3 and the riveted block 1 are riveted, the main riveted section 3023 and the riveted block 1 are welded and fixed in the welding groove 1014, which helps to improve the sealing performance of the welding part, prevent electrolyte leakage, and ensure the safety and reliability of the product.

[0085] According to an embodiment of the present invention, on the other hand, a battery cell is provided, including a housing and a battery cell cover.

[0086] Because the battery cell includes a battery cell cover plate, it has the same effect as the battery cell cover plate structure, which will not be described in detail here.

[0087] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A riveted top cover, characterized in that: include: A riveting block (1) is provided with a through hole (101), wherein the through hole (101) comprises a matching hole (1011), a secondary riveting hole (1012) and a main riveting hole (1013) which are coaxially arranged in sequence; A pole (3) comprising a base (301) and a raised portion (302) provided on the base (301); the raised portion (302) being provided with a matching segment (3021), a secondary riveting segment (3022) and a main riveting segment (3023) corresponding one-to-one to the matching hole (1011), the secondary riveting hole (1012) and the main riveting hole (1013); the raised portion (302) being suitable for penetrating into the through hole (101); an outer wall of the matching segment (3021) being gap-matched with a hole wall of the matching hole (1011); and the pole (3) and the riveting block (1) being in a pre-assembled state and a riveted state; In the pre-assembled state, the protrusion (302) is inserted into the through hole (101), a first annular cavity (303) is left between the outer wall of the secondary riveting section (3022) and the hole wall of the secondary riveting hole (1012), and a second annular cavity (304) is left between the outer wall of the primary riveting section (3023) and the hole wall of the primary riveting hole (1013); In the riveted state, the main riveted section (3023) is expanded by the force to fill the second annular cavity (304), and the secondary riveted section (3022) is expanded by the force to fill the first annular cavity (303).

2. The riveted top cover according to claim 1, characterized in that: The diameter of the main riveting hole (1013) is d1, the diameter of the main riveting section (3023) is d1', the diameter of the secondary riveting hole (1012) is d2, the diameter of the secondary riveting section (3022) is d2', the width of the second annular cavity (304) is d1-d1', the width of the first annular cavity (303) is d2-d2', and the ratio of the first annular cavity (303) to the second annular cavity (304) is θ, satisfying 30%≤θ=(d2-d2') / (d1-d1')≤50%.

3. The riveted top cover according to claim 1, characterized in that: The hole diameter of the matching hole (1011) is d3, the diameter of the matching section (3021) is d3', and the relationship coefficient between the hole diameter of the matching hole (1011) and the diameter of the matching section (3021) is (d3-d3') / d3', satisfying 0.01≤(d3-d3') / d3'≤0.

02.

4. The riveted top cover according to claim 1, characterized in that: The diameter of the main riveting hole (1013) is d1, and the diameter of the main riveting section (3023) is d1', satisfying d1-d1'≥0.8mm.

5. The riveted top cover according to claim 1, characterized in that: The diameter of the secondary riveting hole (1012) is larger than the diameter of the primary riveting section (3023).

6. The riveted top cover according to claim 1, characterized in that: The ratio of the hole depth of the primary riveting hole (1013) to the hole depth of the secondary riveting hole (1012) is 35%-55%, and / or the ratio of the hole depth of the matching hole (1011) to the hole depth of the secondary riveting hole (1012) is 25%-35%.

7. The riveted top cover according to any one of claims 1 to 6, characterized in that: The through hole (101) further comprises a welding groove (1014), the welding groove (1014) being arranged on a side of the main riveting hole (1013) away from the secondary riveting hole (1012) and located at an end of the through hole (101), and the hole diameter of the welding groove (1014) being larger than the hole diameter of the main riveting hole (1013).

8. The riveted top cover according to any one of claims 1 to 6, characterized in that: The raised portion (302) further comprises a mounting section (3024), wherein the mounting section (3024) is arranged between the matching section (3021) and the base (301), the diameter of the mounting section (3024) being greater than the diameter of the matching section (3021), and the outer wall of the mounting section (3024) being suitable for sleeve-mounting a sealing ring (6).

9. A battery cell cover, characterized in that: include: The cover plate body (4) is provided with a mounting hole; The riveted top cover according to any one of claims 1 to 8, wherein the through hole (101) is coaxially arranged with the mounting hole, the protrusion (302) is sequentially penetrated into the mounting hole and the through hole (101), and the cover body (4), the riveted block (1) and the pole (3) are fixedly connected by riveting.

10. A battery cell, characterized in that: include: case; The battery cell cover plate as described in claim 9, wherein the battery cell cover plate is fixedly connected to the shell.

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