Battery cover plate structure and lithium battery

Abstract

The application relates to the technical field of lithium batteries, and discloses a battery cover plate structure and a lithium battery. The battery cover plate structure comprises a plate piece, a connecting block, and a pole. The plate piece is provided with a first through hole in the thickness direction. The connecting block is arranged on one side of the plate piece in the thickness direction. One end of the pole in the axial direction is adapted to pass through the first through hole and is riveted with the connecting block. An upper insulating piece body is made of an elastic material and is adapted to insulate and seal between the connecting block and the plate piece. The upper insulating piece body extends in the thickness direction to form a protruding part away from the connecting block. The protruding part is arranged between the outer side wall of the pole and the inner side wall of the first through hole and is adapted to insulate and seal between the pole and the plate piece. The battery cover plate structure can realize the insulation and sealing between the connecting block and the plate piece and between the pole and the plate piece at the same time, the sealing ring is omitted, the number of structural parts of the cover plate is reduced, the assembly process and equipment tooling of the cover plate are simplified, and the production rhythm is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery, in particular to a battery cover plate structure and lithium battery. BACKGROUND

[0002] With the increasing maturity of lithium ion battery technology, lithium ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the use performance and safety of lithium ion batteries are increasingly required. The lithium battery cover plate is a component in the lithium ion battery. Its role is first to isolate the internal and external environment after welding with the aluminum shell, and to play a sealing role. Secondly, it connects the internal and external circuits, and delivers the current inside the battery to the outside through the cover plate pole, and plays a flow guiding role.

[0003] The traditional cover plate is generally composed of an aluminum sheet, a (positive or negative) pole, an upper plastic, a lower insulating part, an explosion-proof valve and an explosion-proof valve protection film. During assembly, the upper plastic, the aluminum sheet, the lower insulating part and the sealing ring are clamped between the pole bottom plate and the connecting block. After clamping, the upper end of the pole is fixed with the connecting block by riveting and laser welding.

[0004] However, the existing cover plate has a large number of structural parts, resulting in a large number of assembly processes, complex equipment and tooling, and slow production rhythm. SUMMARY

[0005] Therefore, the present application provides a battery cover plate structure and lithium battery to solve the problem that the existing cover plate has a large number of structural parts, resulting in a large number of assembly processes, complex equipment and tooling, and slow production rhythm.

[0006] In a first aspect, the present application provides a battery cover plate structure, comprising:

[0007] a plate piece, a first through hole is formed in the thickness direction of the plate piece;

[0008] a connecting block arranged on one side of the plate piece in the thickness direction;

[0009] a pole arranged on the side of the plate piece away from the connecting block in the thickness direction, one end of the pole in the axial direction thereof is adapted to pass through the first through hole and be fixedly connected with the connecting block;

[0010] an upper insulating part body made of an elastic material, the upper insulating part body is arranged between the connecting block and the plate piece, and the upper insulating part body is adapted to insulate and seal the connecting block and the plate piece;

[0011] the upper insulating part body extends in the thickness direction to form a protruding portion away from the connecting block, the protruding portion is arranged between the outer side wall of the pole and the inner side wall of the first through hole, and the protruding portion is adapted to insulate and seal the pole and the plate piece;

[0012] The pole post has a base plate at one end away from the connecting block along its own axial direction; the upper insulating body also includes a sealing part connected to the end of the protrusion, the sealing part is compressed and sealed between the plate and the base plate, and the uncompressed sealing part has a circular structure in the cross section along the axis of the pole post; the upper insulating body, the protrusion and the sealing part are integrally formed structures.

[0013] On a cross-section along the axis of the pole post, the minimum distance between the uncompressed sealing portion and the plate along the axial direction of the pole post is g1, satisfying 0.2mm ≤ g1 ≤ 1mm; and / or,

[0014] On a cross-section along the axis of the pole post, in a direction perpendicular to the axis of the pole post, the distance z between the center of the uncompressed sealing part and the wall of the first through hole satisfies 0.2mm ≤ z ≤ 3mm; and / or,

[0015] On a cross-section along the axis of the pole post, in a direction perpendicular to the axis of the pole post, the distance between the uncompressed sealing portion away from the pole post and the wall of the first through hole is w3, satisfying 0.5mm≤w3≤3mm; and / or,

[0016] On a cross-section along the axis of the pole, the width of the connection between the sealing part and the protrusion is w1, satisfying 0.3mm ≤ w1 ≤ 3mm; and / or,

[0017] On a cross-section along the axis of the pole post, in a direction perpendicular to the axis of the pole post, the distance between the protrusion and the pole post is g2, satisfying 0.05mm ≤ g2 ≤ 0.5mm; and / or,

[0018] On the cross-section along the axis of the pole, the diameter of the uncompressed sealing part is k, which satisfies 0.75mm≤k≤4mm.

[0019] The battery cover structure provided by this invention, by setting an upper insulating body between the connecting block and the plate, and the upper insulating body being made of elastic material, allows the connecting block and the plate to simultaneously compress the upper insulating body during the laser welding and fixing process of the terminal post and the connecting block. This causes the upper insulating body to fit tightly against both the connecting block and the plate under its own elastic restoring force, thus not only insulating the connecting block and the plate but also achieving a seal between them. Furthermore, by providing a protrusion on one side of the upper insulating body in the thickness direction, the protrusion is embedded between the outer peripheral wall of the terminal post and the inner peripheral wall of the first through hole, thereby insulating the terminal post and the plate. This simultaneously achieves insulation between the connecting block and the plate, and between the terminal post and the plate, while ensuring a sealed interior of the battery. The battery cover structure provided by this invention eliminates the need for an additional sealing ring, reduces the number of structural components in the cover, simplifies the assembly process and equipment tooling, and improves production cycle time.

[0020] In one alternative embodiment, the upper insulating body has a first recessed platform on one side of the side close to the connecting block along the thickness direction, and the connecting block has a first boss that mates with the first recessed platform. The first boss is adapted to be pressed and sealed with the first recessed platform.

[0021] With this configuration, during the laser welding and fixing process of the pole post and the connecting block, the connecting block and the plate simultaneously compress the upper insulating body, so that the first protrusion compresses the upper insulating body and squeezes the material into the periphery of the first recess. Under the action of its own elastic recovery force, the upper insulating body can ensure a stable compression seal between the first recess and the first protrusion, thereby achieving an insulation seal between the connecting block and the plate.

[0022] In one optional embodiment, the compression of the first boss on the first sinker is B1, where B1 satisfies 25%≤B1 / A1≤50%, and A1 is the initial thickness of the first sinker, where A1 satisfies A1≥0.3 mm.

[0023] This configuration ensures effective compression, guaranteeing both the effective rebound of the first recessed platform to prevent its collapse and the effective compression between the first recessed platform and the first protrusion to prevent air leakage, thereby effectively preventing seal failure.

[0024] In one optional embodiment, the depth of the first protrusion is C1, and the width of the first protrusion is E1. C1 and E1 satisfy (E1-D1)·C1≥D1·B1, where D1 is the width of the first protrusion and D1≥0.5 mm.

[0025] By setting it up in this way, the filling rate of the material squeezed into the surrounding gap after the first boss is compressed against the upper insulating body does not exceed 100%. This ensures that while achieving the compression and sealing between the upper insulating body and the connecting block, it effectively prevents the first boss from expanding due to excessive material extrusion, thus ensuring an effective seal between the upper insulating body and the connecting block.

[0026] In one alternative embodiment, the upper insulating body has a second recessed platform on one side of the plate along the thickness direction, and the plate has a second protrusion that matches the second recessed platform. The second protrusion is adapted to be pressed and sealed with the second recessed platform.

[0027] With this configuration, during the laser welding and fixing process of the pole post and the connecting block, the connecting block and the plate simultaneously compress the upper insulating body, thereby causing the second protrusion to compress the upper insulating body and squeeze the material into the peripheral gap of the second recess. Under the action of its own elastic restoring force, the upper insulating body can ensure a stable compression seal between the second protrusion and the second recess, thereby further ensuring the insulation seal between the connecting block and the plate.

[0028] In one optional embodiment, the compression of the second boss on the second countersunk stage is B2, where B2 satisfies 25% ≤ B2 / A2 ≤ 50%, and A2 is the initial thickness of the second countersunk stage, satisfying A2 ≥ 0.3 mm; and / or,

[0029] The radial distance between the second sinking platform and the first sinking platform is F, where F satisfies 1 mm ≤ F ≤ 5 mm.

[0030] This configuration ensures effective compression, guaranteeing both the effective rebound of the second recessed platform to prevent its collapse and the effective compression between the second recessed platform and the second protrusion to prevent air leakage, thereby effectively preventing seal failure.

[0031] This design avoids structural conflicts between the sealing structure of the connecting block and the insulating body and the sealing structure of the plate and the insulating body, preventing the upper insulating body from being damaged due to excessive stress. It also prevents warping in the area of ​​the connecting block away from the central axis of the pole post, ensuring the insulation and sealing effect of the upper insulating body between the connecting block and the plate.

[0032] In one optional implementation, the depth of the second protrusion is C2, and the width of the second protrusion is E2. C2 and E2 satisfy (E2-D2)·C2≥D2·B2, where D2 is the width of the second protrusion.

[0033] This configuration ensures that the filling rate of the material squeezed into the surrounding gaps after the second protrusion is compressed against the upper insulating body does not exceed 100%. This achieves compression sealing between the upper insulating body and the plate while effectively preventing the second protrusion from expanding due to excessive material extrusion, thus ensuring an effective seal between the upper insulating body and the plate.

[0034] In one alternative embodiment, the battery cover structure further includes a lower insulating member, one side of which abuts against the base plate in the thickness direction and the other side of which abuts against the plate.

[0035] The lower insulating member is formed into a second through hole along the thickness direction; the protrusion extends into the second through hole along the thickness direction away from the connecting block, and the protrusion is disposed between the outer peripheral wall of the pole post and the inner peripheral wall of the second through hole.

[0036] On a cross section along the axis of the pole post, the thickness of the lower insulating part located between the base plate and the plate is h, which satisfies 0.6mm≤h≤2mm, and the compression ratio of the sealing part satisfies 20%≤(kh) / h≤50%; and / or, on a cross section along the axis of the pole post, in a direction perpendicular to the axis of the pole post, the distance between the side of the uncompressed sealing part away from the pole post and the wall of the second through hole is w2, which satisfies w2≥1.5×w3.

[0037] With this configuration, during the laser welding and fixing process of the electrode post and the connecting block, the outer peripheral wall of the electrode post and the inner peripheral wall of the second through hole can apply a compressive force to the protrusion. Through the interaction between the compressive force and the elastic restoring force of the protrusion itself, the inner and outer sides of the protrusion can be tightly fitted with the outer peripheral wall of the electrode post and the inner peripheral wall of the second through hole at the same time, thereby achieving a seal between the electrode post and the lower insulating component, and further ensuring the internal sealing of the battery.

[0038] Secondly, the present invention also provides a lithium battery, comprising: a lithium battery body, and a battery cover structure as described above.

[0039] Since the lithium battery of the second aspect includes the battery cover structure of the first aspect, the lithium battery of the second aspect includes all the beneficial effects of the battery cover structure of the first aspect. Attached Figure Description

[0040] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is an exploded structural diagram of a battery cover structure according to an embodiment of the present invention;

[0042] Figure 2 for Figure 1 A magnified view of the plate shown from another perspective;

[0043] Figure 3 for Figure 1 A three-dimensional structural schematic diagram of the upper insulating component body from one perspective;

[0044] Figure 4 This is a top view schematic diagram of a battery cover structure according to an embodiment of the present invention;

[0045] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of the PP section;

[0046] Figure 6 for Figure 5 A magnified view of a portion of point Q;

[0047] Figure 7 for Figure 1 A three-dimensional structural schematic diagram of the upper insulating component body from another perspective;

[0048] Figure 8 for Figure 1 A three-dimensional structural diagram of the connecting block shown in the figure from one perspective;

[0049] Figure 9 for Figure 6 A magnified view of the dimensions at point T in the middle;

[0050] Figure 10 for Figure 6 Another magnified view of the area at point T;

[0051] Figure 11 for Figure 6 Another magnified view of the area at point T;

[0052] Figure 12 for Figure 1 A three-dimensional structural schematic diagram of the lower insulating component from another perspective;

[0053] Figure 13 This is a partially enlarged structural diagram of another battery cover structure according to an embodiment of the present invention;

[0054] Figure 14 for Figure 13 The diagram shows a structural schematic of the assembly process of the plate and the upper insulating component.

[0055] Figure 15 for Figure 13 The diagram shows the structure after the plate and upper insulating component body are assembled.

[0056] Figure 16 A schematic diagram of the fit between the plate and the sealing part when the value of z is too small;

[0057] Figure 17 This is a schematic diagram of the mating structure of the plate and the sealing part in an embodiment of the present invention.

[0058] Explanation of reference numerals in the attached figures:

[0059] 10. Plate; 11. First through hole; 12. Second boss;

[0060] 20. Connecting block; 21. First boss;

[0061] 30. Pole post; 31. Base plate;

[0062] 40. Upper insulating component body; 41. Protrusion; 42. First recessed platform; 43. Second recessed platform; 44. Sealing part;

[0063] 50. Lower insulating component; 51. Second through hole. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0065] In related technologies, the cover plate generally consists of plates (positive and negative electrodes), terminals (positive and negative electrodes), upper plastic, lower insulating components, an explosion-proof valve, and a protective membrane. During assembly, the terminal block clamps the upper plastic, plate insulating components, and sealing ring. After clamping, the terminals and connecting blocks are riveted and laser-welded to fix them. The upper plastic serves to hold the connecting blocks together; the sealing ring prevents the terminals from sticking out of the battery, ensuring an internal seal and providing insulation.

[0066] However, the cover plate in the relevant technology has a large number of structural components, resulting in numerous assembly steps, complex equipment and tooling, and a slow production cycle.

[0067] The following is combined Figures 1 to 12 The following describes embodiments of the present invention.

[0068] According to an embodiment of the present invention, in one aspect, a battery cover structure is provided, comprising:

[0069] Plate 10 can be made of aluminum. Please refer to... Figure 1 and Figure 2 As shown, the plate 10 has a first through hole 11 formed along the thickness direction;

[0070] The connecting block 20 is disposed on one side of the plate 10 in the thickness direction;

[0071] The pole post 30 is disposed on the side of the plate 10 away from the connecting block 20 along the thickness direction. One end of the pole post 30 along its own axial direction is adapted to pass through the first through hole 11 and be fixed to the connecting block 20 by riveting and laser welding.

[0072] The upper insulating body 40 is made of elastic material and is disposed between the connecting block 20 and the plate 10. The upper insulating body 40 is suitable for insulating and sealing the connection block 20 and the plate 10 during the process of riveting and laser welding fixing of the pole post 30 and the connecting block 20.

[0073] Please combine Figure 1 and Figure 3 As shown, the upper insulating body 40 extends along the thickness direction away from the connecting block 20 to form a protrusion 41. The protrusion 41 and the upper insulating body 40 are integrally formed. Please refer to them together. Figure 6As shown, the protrusion 41 is an annular boss structure. The protrusion 41 is coaxially arranged with the first through hole 11. The protrusion 41 is located between the outer peripheral wall of the pole post 30 and the inner peripheral wall of the first through hole 11. The protrusion 41 is suitable for insulating the pole post 30 from the plate 10.

[0074] It should be noted that the upper insulating body 40 can be made of rubber materials such as fluororubber, which has excellent elasticity, insulation and electrolyte resistance, thus playing a role in both insulation and sealing.

[0075] It should be noted that the protrusion 41 is part of the upper insulating body 40. During the process of riveting and laser welding the pole post 30 and the connecting block 20, the outer peripheral wall of the pole post 30 and the inner peripheral wall of the first through hole 11 can apply a compressive force to the protrusion 41. Through the interaction between the compressive force and the elastic restoring force of the protrusion 41 itself, the inner and outer sides of the protrusion 41 can be tightly fitted with the outer peripheral wall of the pole post 30 and the inner peripheral wall of the first through hole 11 at the same time, thereby achieving a seal between the pole post 30 and the plate 10.

[0076] The battery cover structure provided in this embodiment, by setting an upper insulating body 40 between the connecting block 20 and the plate 10, and the upper insulating body 40 being made of elastic material, allows the upper insulating body 40 to be tightly fitted to both the connecting block 20 and the plate 10 during the riveting and laser welding process of the terminal post 30 and the connecting block 20. This not only insulates the connecting block 20 from the plate 10 but also achieves a tight seal between the connecting block 20 and the plate 10. Sealing; by providing a protrusion 41 on one side of the upper insulating body 40 in the thickness direction, the protrusion 41 is built between the outer peripheral wall of the electrode post 30 and the inner peripheral wall of the first through hole 11, thereby insulating the electrode post 30 from the plate 10; thus simultaneously achieving insulation between the connecting block 20 and the plate 10 and between the electrode post 30 and the plate 10, while also ensuring the internal sealing of the battery; the battery cover structure provided in this embodiment eliminates the need for additional sealing rings, reduces the number of structural components of the cover, simplifies the assembly process and equipment tooling of the cover, and improves the production cycle.

[0077] In some embodiments, see Figure 7 As shown, the upper insulating body 40 has a first recessed platform 42 on the side near the connecting block 20 along the thickness direction. Please refer to [link / reference]. Figure 8 As shown, the connecting block 20 is provided with a first boss 21 that mates with the first recessed platform 42. Please connect them together. Figure 6 and Figure 9As shown, the first recessed platform 42 and the first protrusion 21 are both coaxially arranged with the protrusion 41, and the first protrusion 21 is adapted to be squeezed and sealed with the first recessed platform 42.

[0078] In this embodiment, by setting a first recessed platform 42 on the upper insulating body 40 and setting a first protrusion 21 on the connecting block 20 that matches the first recessed platform 42, during the process of riveting and laser welding the pole post 30 and the connecting block 20, the connecting block 20 and the plate 10 simultaneously compress the upper insulating body 40, so that the first protrusion 21 compresses the upper insulating body 40 and squeezes the material into the peripheral gap of the first recessed platform 42. Under the action of its own elastic recovery force, the upper insulating body 40 can ensure a stable compression seal between the first recessed platform 42 and the first protrusion 21, thereby achieving an insulating seal between the connecting block 20 and the plate 10.

[0079] In some embodiments, see Figure 9 As shown, the compression of the first boss 21 on the first recessed platform 42 is B1, where B1 satisfies 25%≤B1 / A1≤50%, and A1 is the initial thickness of the first recessed platform 42, where A1 satisfies A1≥0.3 mm.

[0080] It should be noted that, please refer to Figure 9 As shown, dimension line A1 indicates the initial thickness of the first recessed platform 42. If the initial thickness of the first recessed platform 42 is too thin, it will not only easily result in insufficient elasticity of the first recessed platform 42, leading to failure to rebound or insufficient rebound, thus causing sealing failure, but also easily cause the first recessed platform 42 to collapse during the simultaneous compression of the upper insulating body 40 by the connecting block 20 and the plate 10, which will also lead to sealing failure. Therefore, the initial thickness A1 of the first recessed platform 42 must satisfy A1≥0.3 mm. See also Figure 9 As shown, dimension line B1 indicates the compression amount of the first boss 21 on the first recessed platform 42. If the compression amount of the first boss 21 on the first recessed platform 42 is too large, it is easy to cause permanent deformation of the first recessed platform 42, making it unable to rebound, or even causing the first recessed platform 42 to collapse, resulting in seal failure. Therefore, the compression amount B1 of the first boss 21 on the first recessed platform 42 must satisfy B1 / A1≤50%. If the compression amount of the first boss 21 on the first recessed platform 42 is too small, it is difficult to effectively press the first recessed platform 42 and the first boss 21 together, which is easy to leak air. Therefore, the compression amount B1 of the first boss 21 on the first recessed platform 42 must also satisfy B1 / A1≥25%.

[0081] In this embodiment, the compression amount B1 of the first protrusion 21 on the first recess 42 is satisfied by 25%≤B1 / A1≤50%, where A1 is the initial thickness of the first recess 42 and A1≥0.3 mm, thereby ensuring an effective compression amount. This ensures that the first recess 42 can effectively rebound and avoid collapse, and also ensures that the first recess 42 and the first protrusion 21 are effectively pressed together to avoid air leakage, thereby effectively preventing seal failure.

[0082] In some embodiments, see Figure 10 As shown, the depth of the first recessed platform 42 is C1, and the width of the first recessed platform 42 is E1. C1 and E1 satisfy (E1-D1)·C1≥D1·B1, where D1 is the width of the first boss 21, and D1≥0.5 mm.

[0083] It should be noted that the width D1 of the first boss 21 is the effective compression sealing width. If the effective compression sealing width is too small, it can easily lead to seal failure. Therefore, D1 must satisfy D1≥0.5 mm. Please refer to this information. Figure 9 and Figure 10 As shown, "D1·B1" represents the volume of the material squeezed by the first boss 21 onto the upper insulating body 40, and "(E1-D1)·C1" represents the volume of the filling gap between the first boss 21 and the first recessed platform 42. By satisfying (E1-D1)·C1≥D1·B1, it is ensured that the filling rate of the material squeezed by the first boss 21 onto the upper insulating body 40 after compression does not exceed 100%. This effectively prevents the first recessed platform 42 from expanding due to excessive material filling while achieving the matching compression seal between the upper insulating body 40 and the connecting block 20, thereby ensuring an effective seal between the upper insulating body 40 and the connecting block 20.

[0084] Referring to Table 1 below, the following test examples verify the helium detection effect of the battery cover structure provided in the embodiment of the present invention, which is sealed by the first protrusion 21 and the first recess 42.

[0085] Under normal conditions:

[0086] As shown in Example 9 of Table 1, A1 = 0.33 mm, B1 = 0.16 mm, C1 = 0.4 mm, D1 = 0.7 mm, and E1 = 1.3 mm. At this time, the dimensions satisfy A1 ≥ 0.3 mm, 25% ≤ B1 / A1 ≤ 50%, D1 ≥ 0.5 mm, and (E1 - D1)·C1 ≥ D1·B1. The battery cover structure passes the helium test and meets the requirements.

[0087] As shown in Example 10 of Table 1, A1 = 0.8 mm, B1 = 0.3 mm, C1 = 0.3 mm, D1 = 0.63 mm, and E1 = 1.3 mm. At this time, the dimensions satisfy A1 ≥ 0.3 mm, 25% ≤ B1 / A1 ≤ 50%, D1 ≥ 0.5 mm, and (E1 - D1)·C1 ≥ D1·B1. The battery cover structure passes the helium test and meets the requirements.

[0088] As shown in Example 11 of Table 1, A1 = 0.31 mm, B1 = 0.08 mm, C1 = 0.33 mm, D1 = 0.77 mm, and E1 = 1.5 mm. At this time, the dimensions satisfy A1 ≥ 0.3 mm, 25% ≤ B1 / A1 ≤ 50%, D1 ≥ 0.5 mm, and (E1 - D1)·C1 ≥ D1·B1. The battery cover structure passes the helium test and meets the requirements.

[0089] Under extreme conditions:

[0090] As shown in Table 1, Example 1, A1 = 0.32 mm, B1 = 0.16 mm, C1 = 0.5 mm, D1 = 0.7 mm, E1 = 1.4 mm. When A1 is close to 0.3 mm, B1 / A1 = 50%, and the remaining dimensions satisfy D1 ≥ 0.5 mm and (E1 - D1)·C1 ≥ D1·B1, the battery cover structure passes the helium test and meets the requirements.

[0091] As shown in Example 4 of Table 1, A1 = 0.7 mm, B1 = 0.18 mm, C1 = 0.5 mm, D1 = 0.51 mm, E1 = 1.4 mm. When D1 is close to 0.5 mm, B1 / A1 = 26%, and the remaining dimensions satisfy A1 ≥ 0.3 mm and (E1 - D1)·C1 ≥ D1·B1, the battery cover structure passes the helium test and meets the requirements.

[0092] As shown in Example 8 of Table 1, A1 = 0.34 mm, B1 = 0.15 mm, C1 = 0.3 mm, D1 = 0.7 mm, and E1 = 1.1 mm. When (E1 - D1)·C1 is slightly larger than D1·B1, and the remaining dimensions satisfy A1 ≥ 0.3 mm, 25% ≤ B1 / A1 ≤ 50%, and D1 ≥ 0.5 mm, the battery cover structure passes the helium test and meets the requirements.

[0093] The following are comparative examples:

[0094] As shown in Comparative Example 2 in Table 1, when A1 = 0.28 mm, it does not meet the requirement of A1 ≥ 0.3 mm, and the other dimensions meet the requirements of D1 ≥ 0.5 mm, 25% ≤ B1 / A1 ≤ 50%, and (E1 - D1)·C1 ≥ D1·B1, the helium leak detection rate of the battery cover structure does not meet the requirements.

[0095] As shown in Comparative Example 3 in Table 1, when D1 = 0.47 mm, it does not meet the requirement of D1 ≥ 0.5 mm, and the other dimensions meet the requirements of A1 ≥ 0.3 mm, 25% ≤ B1 / A1 ≤ 50%, and (E1 - D1)·C1 ≥ D1·B1, the helium leak detection rate of the battery cover structure does not meet the requirements.

[0096] As shown in Comparative Example 5 in Table 1, when B1 / A1 = 24%, it does not meet the requirement of 25%≤B1 / A1≤50%, and the remaining dimensions meet the requirements of A1≥0.3 mm, D1≥0.5 mm, and (E1-D1)·C1≥D1·B1, the helium leak detection rate of the battery cover structure does not meet the requirements.

[0097] As shown in Comparative Example 6 in Table 1, when B1 / A1 = 53%, it does not meet the requirement of 25% ≤ B1 / A1 ≤ 50%, and the remaining dimensions meet the requirements of A1 ≥ 0.3 mm, D1 ≥ 0.5 mm, and (E1 - D1)·C1 ≥ D1·B1, the helium leak detection rate of the battery cover structure does not meet the requirements.

[0098] As shown in Comparative Example 7 in Table 1, when (E1-D1)·C1≥D1·B1 is not satisfied, and the remaining dimensions satisfy A1≥0.3 mm, D1≥0.5 mm, and 25%≤B1 / A1≤50%, the helium leak detection rate of the battery cover structure does not meet the requirements.

[0099] Table 1

[0100]

[0101] Therefore, it can be seen that, firstly, the initial thickness A1 of the first recessed platform 42 satisfies A1≥0.3 mm, which can effectively prevent the battery cover structure from failing to seal; secondly, the width D1 of the first protrusion 21 satisfies D1≥0.5 mm, which can effectively prevent the battery cover structure from failing to seal; thirdly, B1 / A1 satisfies 25%≤B1 / A1≤50%, which can ensure the effective sealing of the battery cover structure; fourthly, by satisfying (E1-D1)·C1≥D1·B1, the effective sealing of the battery cover structure can be guaranteed.

[0102] In some embodiments, see Figure 3 As shown, the upper insulating body 40 has a second recessed platform 43 on the side near the plate 10 along the thickness direction. Please refer to [link / reference]. Figure 2 As shown, the plate 10 is provided with a second boss 12 that mates with the second recessed platform 43. Please combine them together. Figure 6 and Figure 9 As shown, the second recessed platform 43 and the second protrusion 12 are both coaxially arranged with the protrusion 41, and the second protrusion 12 is adapted to be squeezed and sealed with the second recessed platform 43.

[0103] In this embodiment, by providing a second recessed platform 43 on the upper insulating body 40 and a second protrusion 12 that matches the second recessed platform 43 on the plate 10, during the process of riveting and laser welding the pole post 30 and the connecting block 20, the connecting block 20 and the plate 10 simultaneously compress the upper insulating body 40, thereby causing the second protrusion 12 to compress the upper insulating body 40 and squeeze the material into the peripheral gap of the second recessed platform 43. Under the action of its own elastic recovery force, the upper insulating body 40 can ensure a stable compression seal between the second protrusion 12 and the second recessed platform 43, thereby further ensuring the insulation seal between the connecting block 20 and the plate 10.

[0104] In some embodiments, see Figure 9 As shown, the compression of the second boss 12 on the second sinker 43 is B2, which satisfies 25%≤B2 / A2≤50%, where A2 is the initial thickness of the second sinker 43, and A2 satisfies A2≥0.3 mm.

[0105] It should be noted that, please refer to Figure 9 As shown, dimension line A2 indicates the initial thickness of the second recessed platform 43. If the initial thickness of the second recessed platform 43 is too thin, it will not only easily result in insufficient elasticity of the second recessed platform 43, leading to inability to rebound or insufficient rebound and thus sealing failure, but also easily cause the second recessed platform 43 to collapse during the simultaneous compression of the upper insulating body 40 by the connecting block 20 and the plate 10, which will also lead to sealing failure. Therefore, the initial thickness A2 of the second recessed platform 43 must meet the requirement of A2≥0.3 mm. See also Figure 9 As shown, dimension line B2 indicates the compression amount of the second boss 12 on the second recessed platform 43. If the compression amount of the second boss 12 on the second recessed platform 43 is too large, it is easy to cause permanent deformation of the second recessed platform 43, making it unable to spring back, or even causing the second recessed platform 43 to collapse, resulting in seal failure. Therefore, the compression amount B2 of the second boss 12 on the second recessed platform 43 must satisfy B1 / A1≤50%. If the compression amount of the second boss 12 on the second recessed platform 43 is too small, it is difficult to effectively compress the second recessed platform 43 and the second boss 12, which is easy to leak air. Therefore, the compression amount B2 of the second boss 12 on the second recessed platform 43 must also satisfy B1 / A1≥25%.

[0106] In this embodiment, the compression amount B2 of the second protrusion 12 on the second recess 43 is satisfied by 25%≤B2 / A2≤50%, where A2 is the initial thickness of the second recess 43 and A2≥0.3 mm, thereby ensuring an effective compression amount. This ensures that the second recess 43 can effectively rebound and avoid collapse, and also ensures that the second recess 43 and the second protrusion 12 are effectively pressed together to avoid air leakage, thereby effectively preventing seal failure.

[0107] In some embodiments, see Figure 11 As shown, the depth of the second recessed platform 43 is C2, and the width of the second recessed platform 43 is E2. C2 and E2 satisfy (E2-D2)·C2≥D2·B2, where D2 is the width of the second boss 12.

[0108] Furthermore, D2 ≥ 0.5 mm.

[0109] It should be noted that the width D2 of the second boss 12 is the effective compression sealing width. If the effective compression sealing width is too small, it can easily lead to seal failure. Therefore, D2 must satisfy D2≥0.5 mm. Please refer to this information. Figure 9 and Figure 11 As shown, "D2·B2" represents the volume of material extruded by the second protrusion 12 in compression of the upper insulating body 40, and "(E2-D2)·C2" represents the volume of the filling gap between the second protrusion 12 and the second recess 43. By satisfying (E2-D2)·C2≥D2·B2, it is ensured that the filling rate of the material extruded by the second protrusion 12 into the surrounding gap after compression of the upper insulating body 40 does not exceed 100%. This effectively prevents the second recess 43 from expanding due to excessive material extrusion while achieving the matching compression seal between the upper insulating body 40 and the plate 10, thereby ensuring an effective seal between the upper insulating body 40 and the plate 10.

[0110] Referring to Table 2 below, the following test examples verify the helium detection effect of the battery cover structure provided in the embodiment of the present invention, which is sealed by the second protrusion 12 and the second recess 43.

[0111] Under normal conditions:

[0112] As shown in Example 9 of Table 2, A2 = 0.33 mm, B2 = 0.16 mm, C2 = 0.4 mm, D2 = 0.7 mm, and E2 = 1.3 mm. At this time, the dimensions satisfy A2 ≥ 0.3 mm, 25% ≤ B2 / A2 ≤ 50%, D2 ≥ 0.5 mm, and (E2 - D2)·C2 ≥ D2·B2. The battery cover structure passes the helium test and meets the requirements.

[0113] As shown in Table 2, Example 10, A2 = 0.8 mm, B2 = 0.3 mm, C2 = 0.3 mm, D2 = 0.63 mm, E2 = 1.3 mm. At this time, the dimensions satisfy A2 ≥ 0.3 mm, 25% ≤ B2 / A2 ≤ 50%, D2 ≥ 0.5 mm, and (E2 - D2)·C2 ≥ D2·B2. The battery cover structure passes the helium test and meets the requirements.

[0114] As shown in Example 11 of Table 2, A2 = 0.31 mm, B2 = 0.08 mm, C2 = 0.33 mm, D2 = 0.77 mm, and E2 = 1.5 mm. At this time, the dimensions satisfy A2 ≥ 0.3 mm, 25% ≤ B2 / A2 ≤ 50%, D2 ≥ 0.5 mm, and (E2 - D2)·C2 ≥ D2·B2. The battery cover structure passes the helium test and meets the requirements.

[0115] Under extreme conditions:

[0116] As shown in Table 2, Example 1, A2 = 0.32 mm, B2 = 0.16 mm, C2 = 0.5 mm, D2 = 0.7 mm, E2 = 1.4 mm. When A2 is close to 0.3 mm, B2 / A2 = 50%, and the remaining dimensions satisfy D2 ≥ 0.5 mm and (E2 - D2)·C2 ≥ D2·B2, the battery cover structure passes the helium test and meets the requirements.

[0117] As shown in Table 2, Example 4, A2 = 0.7 mm, B2 = 0.18 mm, C2 = 0.5 mm, D2 = 0.51 mm, E2 = 1.4 mm. When D2 is close to 0.5 mm, B2 / A2 = 26%, and the remaining dimensions satisfy A2 ≥ 0.3 mm and (E2 - D2)·C2 ≥ D2·B2, the battery cover structure passes the helium test and meets the requirements.

[0118] As shown in Example 8 of Table 2, A2 = 0.34 mm, B2 = 0.15 mm, C2 = 0.3 mm, D2 = 0.7 mm, and E2 = 1.1 mm. When (E2 - D2)·C2 is slightly larger than D2·B2, and the remaining dimensions satisfy A2 ≥ 0.3 mm, 25% ≤ B2 / A2 ≤ 50%, and D2 ≥ 0.5 mm, the battery cover structure passes the helium test and meets the requirements.

[0119] The following are comparative examples:

[0120] As shown in Comparative Example 2 in Table 2, when A2 = 0.28 mm, it does not meet the requirement of A2 ≥ 0.3 mm, and the other dimensions meet the requirements of D2 ≥ 0.5 mm, 25% ≤ B2 / A2 ≤ 50%, and (E2 - D2)·C2 ≥ D2·B2, the helium leak detection rate of the battery cover structure does not meet the requirements.

[0121] As shown in Table 2 and Comparative Example 3, when D2 = 0.47 mm, it does not meet the requirement of D2 ≥ 0.5 mm, and the other dimensions meet the requirements of A2 ≥ 0.3 mm, 25% ≤ B2 / A2 ≤ 50%, and (E2 - D2)·C2 ≥ D2·B2, the helium leak detection rate of the battery cover structure does not meet the requirements.

[0122] As shown in Comparative Example 5 in Table 2, when B2 / A2 = 24%, it does not meet the requirement of 25%≤B2 / A2≤50%, and the remaining dimensions meet the requirements of A2≥0.3 mm, D2≥0.5 mm, and (E2-D2)·C2≥D2·B2, the helium leak detection rate of the battery cover structure does not meet the requirements.

[0123] As shown in Comparative Example 6 in Table 2, when B2 / A2 = 53%, it does not meet the requirement of 25% ≤ B2 / A2 ≤ 50%, and the remaining dimensions meet the requirements of A2 ≥ 0.3 mm, D2 ≥ 0.5 mm, and (E2 - D2)·C2 ≥ D2·B2, the helium leak detection rate of the battery cover structure does not meet the requirements.

[0124] As shown in Comparative Example 7 in Table 2, when (E2-D2)·C2≥D2·B2 is not satisfied, and the remaining dimensions satisfy A2≥0.3 mm, D2≥0.5 mm, and 25%≤B2 / A2≤50%, the helium leak detection rate of the battery cover structure does not meet the requirements.

[0125] Table 2

[0126]

[0127] Therefore, it can be seen that, firstly, the initial thickness A2 of the second recessed platform 43 satisfies A2≥0.3 mm, which can effectively prevent the battery cover structure from failing to seal; secondly, the width D2 of the second protrusion 12 satisfies D2≥0.5 mm, which can effectively prevent the battery cover structure from failing to seal; thirdly, B2 / A2 satisfies 25%≤B2 / A2≤50%, which can ensure the effective sealing of the battery cover structure; fourthly, by satisfying (E2-D2)·C2≥D2·B2, the effective sealing of the battery cover structure can be guaranteed.

[0128] In some embodiments, see Figure 9 As shown, the radial distance between the second sinking platform 43 and the first sinking platform 42 is F, where F satisfies 1 mm ≤ F ≤ 5 mm.

[0129] It should be noted that, please refer to Figure 9 As shown, the dimension line F indicates the radial distance between the second recessed platform 43 and the first recessed platform 42. The radial distance between the second recessed platform 43 and the first recessed platform 42 should not be too small; otherwise, it may cause structural conflict between the sealing structure of the connecting block 20 mating with the insulating body 40 and the sealing structure of the plate 10 mating with the insulating body 40, resulting in damage to the upper insulating body 40 due to excessive stress. Therefore, the radial distance F between the second recessed platform 43 and the first recessed platform 42 must satisfy F≥1 mm. Please refer to this information in conjunction with... Figure 6As shown, since the mating compression seal between the connecting block 20 and the upper insulating body 40, as well as the mating compression seal between the plate 10 and the upper insulating body 40, are both provided by the riveting laser welding of the pole post 30 and the connecting block 20 to provide the clamping force, if the radial distance between the second recess 43 and the first recess 42 is too large, on the one hand, it is easy for the area of ​​the connecting block 20 away from the central axis of the pole post 30 to warp, and on the other hand, it is easy for the area of ​​the connecting block 20 away from the central axis of the pole post 30 to fail to press against the upper insulating body 40, thus affecting the sealing effect. Therefore, the radial distance F between the second recess 43 and the first recess 42 must also satisfy F≤5 mm.

[0130] In this embodiment, the radial distance F between the second recessed platform 43 and the first recessed platform 42 satisfies 1 mm ≤ F ≤ 5 mm. This not only avoids structural conflicts between the sealing structure of the connecting block 20 mating with the insulating body 40 and the sealing structure of the plate 10 mating with the insulating body 40, preventing the upper insulating body 40 from being damaged due to excessive stress, but also prevents warping of the area of ​​the connecting block 20 away from the central axis of the pole post 30, ensuring the insulation and sealing effect of the upper insulating body 40 between the connecting block 20 and the plate 10.

[0131] In some embodiments, see Figure 6 As shown, the pole post 30 is provided with a base plate 31 at one end away from the connecting block 20 along its own axis; the battery cover structure also includes a lower insulating member 50, which is disposed between the base plate 31 and the plate 10. One side of the lower insulating member 50 abuts against the base plate 31 in the thickness direction, and the other side abuts against the plate 10.

[0132] Please combine them together Figure 12 As shown, the lower insulating member 50 has a second through hole 51 formed along its thickness direction; see also Figure 6 As shown, the protrusion 41 extends along the thickness direction away from the connecting block 20 into the second through hole 51, and the protrusion 41 is disposed between the outer peripheral wall of the pole post 30 and the inner peripheral wall of the second through hole 51.

[0133] It should be noted that, as part of the upper insulating component body 40, during the process of riveting and laser welding the electrode post 30 and the connecting block 20, the outer peripheral wall of the electrode post 30 and the inner peripheral wall of the second through hole 51 can apply a compressive force to the protrusion 41. Through the interaction between the compressive force and the elastic restoring force of the protrusion 41 itself, the inner and outer sides of the protrusion 41 can be tightly fitted with the outer peripheral wall of the electrode post 30 and the inner peripheral wall of the second through hole 51 at the same time, thereby achieving a seal between the electrode post 30 and the lower insulating component 50, and further ensuring the internal sealing of the battery.

[0134] In one embodiment, such as Figure 13As shown, the upper insulating body 40 also includes a sealing portion 44 connected to the end of the protrusion 41. The sealing portion 44 is compressed and sealed between the plate 10 and the base plate 31. In a cross-section along the axis of the electrode post 30, the uncompressed sealing portion 44 has a circular structure. Therefore, by providing the sealing portion 44 to seal between the plate 10 and the base plate 31, contact between the electrolyte and the electrode post 30 is prevented, thus avoiding corrosion failure of the electrode post 30, while ensuring that the upper insulating body 40 is easy to assemble.

[0135] It is worth noting that for the copper-aluminum composite electrode post 30, the base plate 31 is made of copper, and the upper part of the base plate 31 is made of aluminum. The negative electrode of the battery has a low potential. If the electrolyte comes into contact with the aluminum electrode post 30, electrochemical corrosion will occur, causing the composite cross section of the copper and aluminum materials to fall off, and the structural strength of the electrode post 30 to fail.

[0136] It should be further explained that in this embodiment, the upper insulating body 40, the protrusion 41, and the sealing part 44 are integrally formed. During the assembly process of the battery cover structure in this embodiment, the integrally formed upper insulating body 40 needs to be inserted into the first through hole 11 of the plate 10. Therefore, in this embodiment, the uncompressed sealing part 44 has a circular cross-section. During assembly, the contact area between the sealing part 44 and the hole wall of the first through hole 11 is relatively small (see [link to documentation]). Figure 14 The upper insulating body 40 is less obstructed, making it easier to assemble. When the upper insulating body 40 is assembled, the arc-shaped outer wall of the sealing part 44 can act as a guide, facilitating the deformation and reset of the sealing part 44 during the assembly process, and ensuring that the lower part of the sealing part 44 slide plate 10 is properly positioned.

[0137] In one embodiment, such as Figure 13 As shown, in the cross-section along the axis of the pole post 30, the minimum distance between the uncompressed sealing part 44 and the plate 10 along the axial direction of the pole post 30 is g1, which satisfies 0.2mm≤g1≤1mm. This setting ensures that the sealing part 44 can be assembled in place while avoiding wasted space and ensuring the compression effect of the base plate 31 on the sealing part 44 after assembly.

[0138] It is worth noting that if g1 > 1 mm, the distance between the sealing part 44 and the plate 10 before compression is too far, resulting in the sealing part 44 occupying too much space after assembly with the plate 10. Furthermore, during the subsequent installation of the pole post 30, it is inconvenient for the base plate 31 to compress the sealing part 44, affecting the sealing effect. If g1 < 0.2 mm, the distance between the sealing part 44 and the plate 10 before compression is too close, making it prone to interference with the plate 10 during the deformation and repositioning process of the sealing part 44, hindering the proper positioning of the sealing part 44 during assembly (as per...). Figure 14 Become Figure 15 ).

[0139] In one embodiment, such as Figure 13 As shown, in a cross-section along the axis of the pole post 30, in a direction perpendicular to the axis of the pole post 30, the distance between the center of the uncompressed sealing part 44 and the wall of the first through hole 11 is z, which satisfies 0.2mm≤z≤3mm. This setting facilitates the deformation and reset of the sealing part 44 during assembly while ensuring the sealing effect of the sealing part 44.

[0140] It is worth noting that if z > 3mm, the deformation of the protrusion 41 and the sealing part 44 will be too large during assembly (see [link]). Figure 14 After assembly, it is difficult for the protrusion 41 and the sealing part 44 to deform and reset, affecting the assembly quality of the upper insulating body 40. If z < 0.2 mm, after the sealing part 44 is assembled, the volume between the plate 10 and the base plate 31 is too small, resulting in poor sealing performance. Please compare and contrast. Figure 16 and Figure 17 If the value of z is too small, when the sealing part 44 is squeezed, the lower edge of the plate 10 in the first through hole 11 may directly pierce the outer wall of the sealing part 44, which may cause the sealing part 44 to be cut and affect the sealing effect of the sealing part 44. Therefore, the value of z is controlled to avoid the value of z being too small. When the sealing part 44 is squeezed, the lower edge of the plate 10 in the first through hole 11 can be located in the groove area at the connection between the sealing part 44 and the protrusion 41, so as to avoid damage to the sealing part 44 and thus ensure the sealing effect of the sealing part 44.

[0141] In one embodiment, such as Figure 13 As shown, in a cross-section along the axis of the pole post 30, in a direction perpendicular to the axis of the pole post 30, the distance between the side of the uncompressed sealing part 44 away from the pole post 30 and the wall of the first through hole 11 is w3, satisfying 0.5mm≤w3≤3mm. This setting facilitates the deformation and reset of the sealing part 44 during assembly while ensuring the sealing effect of the sealing part 44.

[0142] It is worth noting that if w3 > 3mm, the deformation of the protrusion 41 and the sealing part 44 will be too large during assembly (see [link]). Figure 14 After assembly, it is difficult for the protrusion 41 and the sealing part 44 to deform and reset, which affects the assembly quality of the upper insulating body 40. In addition, the insertion resistance is large during the assembly process, which is not convenient for assembly. If w3 < 0.5mm, after the sealing part 44 is assembled, the volume between the plate 10 and the bottom plate 31 is too small, and the sealing effect is poor.

[0143] In one embodiment, such as Figure 13As shown, in the cross-section along the axis of the pole post 30, the width of the connection between the sealing part 44 and the protrusion 41 is w1, which satisfies 0.3mm≤w1≤3mm. This configuration ensures the overall structural strength of the upper insulating component body 40 while avoiding material waste and increased production costs.

[0144] It is worth noting that if w1 > 3mm, the protrusion 41 and the sealing part 44 are too thick and heavy, leading to increased material consumption, higher production costs, and hindering the lightweight design of the battery. If w1 < 0.3mm, the connection strength between the protrusion 41 and the sealing part 44 is low, and the sealing part 44 is prone to breakage and detachment during the assembly process of the sealing part 44 and the plate 10, as well as after the base plate 31 squeezes the sealing part 44, which can easily lead to sealing failure.

[0145] In one embodiment, such as Figure 13 As shown, in a cross-section along the axis of the pole post 30, the distance between the protrusion 41 and the pole post 30 in a direction perpendicular to the axis of the pole post 30 is g2, satisfying 0.05mm≤g2≤0.5mm. That is, the distance between the inner circumferential surface of the protrusion 41 and the outer circumferential surface of the pole post 30 is g2. This arrangement facilitates the assembly of the pole post 30 while ensuring the sealing effect of the sealing part 44.

[0146] It is worth noting that if g2 > 0.5 mm, the gap between the protrusion 41 and the pole post 30 is too large. When the base plate 31 presses against the sealing part 44, it is easy for the sealing part 44 to shift towards the center of the pole post 30. If the shift of the sealing part 44 is too large, the volume remaining between the base plate 31 and the plate 10 will be too small, affecting the sealing effect of the sealing part 44. If g2 < 0.05 mm, the assembly gap between the pole post 30 and the protrusion 41 is too small, making it difficult to assemble the pole post 30.

[0147] In one embodiment, such as Figure 13 As shown, in the cross-section along the axis of the pole post 30, the diameter of the uncompressed sealing part 44 is k, satisfying 0.75mm≤k≤4mm. This setting facilitates the deformation and reset of the sealing part 44 during assembly while ensuring the sealing effect of the sealing part 44.

[0148] It is worth noting that if k > 4mm, the deformation of the protrusion 41 and the sealing part 44 will be too large during assembly (see [link]). Figure 14 After assembly, it is difficult for the protrusion 41 and the sealing part 44 to deform and reset, which affects the assembly quality of the upper insulating body 40. In addition, the insertion resistance is large during the assembly process, which is not convenient for assembly. If k < 0.75 mm, after the sealing part 44 is assembled, the volume between the plate 10 and the bottom plate 31 is too small, and the sealing effect is poor.

[0149] In one embodiment, such asFigure 13 As shown, in a cross-section along the axis of the pole post 30, the thickness of the lower insulating member 50 located between the base plate 31 and the plate 10 along the axial direction of the pole post 30 is h, satisfying 0.6mm≤h≤2mm, and the compression ratio of the sealing part 44 satisfies 20%≤(kh) / h≤50%. By limiting the value of h, the insulation effect between the plate 10 and the pole post 30 is ensured while avoiding waste of space and materials; by limiting the compression ratio of the sealing part 44, the sealing effect of the sealing part 44 is ensured while avoiding waste of materials and avoiding extrusion damage to the plate 10 and the base plate 31.

[0150] It is worth noting that if h > 2mm, the thickness of the lower insulating component 50 is too large, resulting in an excessively large overall thickness of the battery cover structure, which reduces space utilization and increases the material consumption of the lower insulating component 50, thus increasing production costs. If h < 0.6mm, the lower insulating component 50 is too thin, and the terminal post 30 and the plate 10 are prone to electrical connection, causing a short circuit and affecting the safety performance of the battery.

[0151] It is worth noting that if the compression ratio of the sealing part 44 is too large, the pressure exerted by the sealing part 44 on the plate 10 and the base plate 31 will be too great, which may easily cause the plate 10 and the base plate 31 to be squeezed and deformed or even broken, affecting the service life of the electrode post 30 and the plate 10. Furthermore, on the one hand, when the volume of the sealing part 44 is constant, if the compression ratio of the sealing part 44 is too large, it means that the distance between the plate 10 and the base plate 31 is too small, which will result in the lower insulating part 50 between the plate 10 and the base plate 31 being too thin, easily causing short circuit problems. On the other hand, when the distance between the plate 10 and the base plate 31 is constant, if the compression ratio of the sealing part 44 is too large, it means that the volume of the sealing part 44 is too large, resulting in increased material consumption and thus increased costs. If the compression ratio of the sealing part 44 is too small, the squeezed sealing part 44 cannot achieve effective sealing between the plate and the base plate 31, which may easily cause the electrolyte to come into contact with the electrode post 30, causing the electrode post 30 to be corroded.

[0152] In one embodiment, such as Figure 13 As shown, in a cross-section along the axis of the pole post 30, in a direction perpendicular to the axis of the pole post 30, the distance between the side of the uncompressed sealing part 44 away from the pole post 30 and the wall of the second through hole 51 is w2, satisfying w2≥1.5×w3. This arrangement ensures that the plate 10, the base plate 31, and the lower insulating member 50 can form a sufficient expansion space for the deformation of the compressed sealing part 44, ensuring that the pole post 30 can be assembled in place and ensuring the sealing effect of the sealing part 44.

[0153] According to an embodiment of the present invention, another aspect provides a lithium battery, comprising: a lithium battery body, and a battery cover structure as described above.

[0154] Since the lithium battery in this solution includes the aforementioned battery cover structure, the lithium battery in this solution includes all the beneficial effects of the aforementioned battery cover structure.

[0155] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cover plate structure, characterized by, The utility model relates to a kind of insulating structure of pole, including: Plate (10) is formed first through hole (11) along the direction of thickness; Connecting block (20) is arranged in the direction of thickness of the plate (10) side; Pole (30) is arranged in the direction of thickness of the plate (10) side away from the connecting block (20), and the pole (30) is adapted to pass through the first through hole (11) and be fixedly connected with the connecting block (20) along its own axial one end; Upper insulating member body (40) is made of elastic material, and the upper insulating member body (40) is arranged between the connecting block (20) and the plate (10), and the upper insulating member body (40) is adapted to insulate and seal between the connecting block (20) and the plate (10); The upper insulating member body (40) extends in the direction of thickness and forms protruding portion (41) away from the connecting block (20), and the protruding portion (41) is arranged between the outer side circumferential wall of the pole (30) and the inner side circumferential wall of the first through hole (11), and the protruding portion (41) is adapted to insulate between the pole (30) and the plate (10); The pole (30) is provided with bottom plate (31) away from the connecting block (20) along its own axial one end;The upper insulating member body (40) further includes sealing portion (44) connected with the end of the protruding portion (41), and the sealing portion (44) is compressed and sealed between the plate (10) and the bottom plate (31), and in the cross section along the axis of the pole (30), the uncompressed sealing portion (44) is circular structure;The upper insulating member body (40), the protruding portion (41) and the sealing portion (44) are integrally formed structure; In the cross section along the axis of the pole (30), along the axial direction of the pole (30), the minimum distance between the uncompressed sealing portion (44) and the plate (10) is g1, and satisfies 0.2mm≤g1≤1mm;And / or, In the cross section along the axis of the pole (30), along the direction perpendicular to the axis of the pole (30), the distance between the center of the uncompressed sealing portion (44) and the hole wall of the first through hole (11) is z, and satisfies 0.2mm≤z≤3mm;And / or, In the cross section along the axis of the pole (30), along the direction perpendicular to the axis of the pole (30), the distance between the side of the uncompressed sealing portion (44) away from the pole (30) and the hole wall of the first through hole (11) is w3, and satisfies 0.5mm≤w3≤3mm;And / or, In the cross section along the axis of the pole (30), the width of the sealing portion (44) and the protruding portion (41) connection place is w1, and satisfies 0.3mm≤w1≤3mm;And / or, In the cross section along the axis of the pole (30), along the direction perpendicular to the axis of the pole (30), the distance between the protruding portion (41) and the pole (30) is g2, and satisfies 0.05mm≤g2≤0.5mm;And / or, In a cross section along the axis of the pole post (30), the diameter of the uncompressed sealing portion (44) is k, satisfying 0.75 mm≤k≤4 mm.

2. The battery cover plate structure of claim 1, wherein, The upper insulating body (40) is provided with a first sunken platform (42) on one side close to the connecting block (20) in the thickness direction, and the connecting block (20) is provided with a first boss (21) matched with the first sunken platform (42), which is adapted to be extruded and sealed with the first sunken platform (42).

3. The battery cover plate structure of claim 2, wherein, The compression amount of the first boss (21) to the first sunken platform (42) is B1, and B1 satisfies 25%≤B1 / A1≤50%, wherein A1 is the initial thickness of the first sunken platform (42), and A1 satisfies A1≥0.3 mm.

4. The battery cover plate structure according to claim 3, characterized by The depth of the first sunken platform (42) is C1, and the width of the first sunken platform (42) is E1, and C1 and E1 satisfy (E1-D1)·C1≥D1·B1, wherein D1 is the width of the first boss (21), and D1≥0.5 mm.

5. The battery cover plate structure of claim 2, wherein, The upper insulating body (40) is provided with a second sunken platform (43) on one side close to the plate piece (10) in the thickness direction, and the plate piece (10) is provided with a second boss (12) matched with the second sunken platform (43), which is adapted to be extruded and sealed with the second sunken platform (43).

6. The battery cover plate structure of claim 5, wherein, The compression amount of the second boss (12) to the second sunken platform (43) is B2, and B2 satisfies 25%≤B2 / A2≤50%, wherein A2 is the initial thickness of the second sunken platform (43), and A2 satisfies A2≥0.3 mm; and / or, The radial distance between the second sunken platform (43) and the first sunken platform (42) is F, and F satisfies 1 mm≤F≤5 mm.

7. The battery cover plate structure of claim 6, wherein, The depth of the second sunken platform (43) is C2, and the width of the second sunken platform (43) is E2, and C2 and E2 satisfy (E2-D2)·C2≥D2·B2, wherein D2 is the width of the second boss (12).

8. The battery cover plate structure of claim 1, wherein, The battery cover plate structure further comprises a lower insulating piece (50), one side of the lower insulating piece (50) in the thickness direction abuts against the bottom plate (31), and the other side abuts against the plate piece (10); The lower insulating piece (50) is provided with a second through hole (51) in the thickness direction; the protruding portion (41) extends to the second through hole (51) in the thickness direction away from the connecting block (20), and the protruding portion (41) is arranged between the outer side wall of the pole post (30) and the inner side wall of the second through hole (51); In a cross section along the axis of the pole column (30), the thickness of the lower insulating member between the bottom plate (31) and the plate piece (10) in the axial direction of the pole column (30) is h, satisfying 0.6mm≤h≤2mm, and the compression rate of the sealing portion (44) satisfies 20%≤(k-h) / h≤50%; and / or, in a cross section along the axis of the pole column (30), the distance between the side of the sealing portion (44) away from the pole column (30) in the direction perpendicular to the axis of the pole column (30) and the hole wall of the second through hole (51) is w2, satisfying w2≥1.5×w3.

9. A lithium battery, characterized by Comprise: A lithium battery body, and a battery cover plate structure according to any one of claims 1-8. A lithium battery body, and a battery cover plate structure according to any one of claims 1-8.

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