Battery top cover assembly and battery

Abstract

The embodiment of the utility model provides a battery top cover assembly and a battery. The battery top cover assembly comprises a top cover, a pole and a first plastic part, the top cover is provided with a pole hole, the pole penetrates through the pole hole, the axis direction of the pole is a first direction, the hole wall of the pole hole is provided with a base station and a clamping jaw structure, the base station and the clamping jaw structure are arranged at intervals in the first direction, and the base station and the top cover are integrally formed; a cavity is formed between the base station and the clamping jaw structure, and at least part of the pole is accommodated in the cavity; and a part of the first plastic part is positioned between the pole and the clamping jaw structure. Therefore, the base table and the top cover are integrally formed, so that the pole columns are more convenient to mount and fix in the assembling process of the battery top cover assembly, and the assembling efficiency of the battery top cover assembly is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery top cover assembly and a battery. Background Art

[0002] Power batteries are important components of new energy vehicles. As the market share of new energy vehicles continues to grow, the quality of power batteries has received more and more attention. The power battery top cover assembly is a key component of the power battery, usually including a top cover and a pole inserted through the top cover, with an insulating member arranged between the top cover and the pole, so that the pole can output current reliably.

[0003] In the prior art, during the assembly process of the pole and the top cover, a metal gasket is usually welded on the side of the top cover facing the inside of the battery to support and fix the pole, so that the pole and the top cover are reliably connected. However, due to the cumbersome welding process of the metal gasket, this will result in low assembly efficiency of the pole and the top cover. Utility Model Content

[0004] The present application aims to provide a battery top cover assembly and a battery to solve the problem of low assembly efficiency of the pole and the top cover of the existing battery top cover assembly.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application discloses a battery top cover assembly, the battery top cover assembly comprising a top cover, a pole and a first plastic part;

[0007] The top cover is provided with a pole hole, the pole is passed through the pole hole, the axial direction of the pole is a first direction, the hole wall of the pole hole is provided with a base and a claw structure, the base and the claw structure are spaced apart in the first direction, and the base and the top cover are integrally formed;

[0008] A cavity is formed between the base and the claw structure, and at least a portion of the pole is accommodated in the cavity;

[0009] A portion of the first plastic component is located between the pole and the claw structure.

[0010] Optionally, the pole hole has a first axis, and the base protrudes from at least a portion of the hole wall of the pole hole toward the first axis.

[0011] Optionally, a dimension of the top cover along the first direction is a, a dimension of the base along the first direction is d, and a ratio of d to a is in the range of 26%≤d / a<100%.

[0012] Optionally, the pole is provided with a first boss along its circumference, and the first boss is embedded between the base and the claw structure to limit the pole from being separated from the pole hole.

[0013] Optionally, a dimension of the top cover along the first direction is a, a dimension of the first boss along the first direction is e, and a ratio of e to a ranges from 20% to 80%.

[0014] Optionally, the claw structure includes an annular boss and a second protrusion; the annular boss protrudes from at least part of the hole wall of the pole hole toward a direction away from the base; the second protrusion is arranged at one end of the annular boss away from the base, and the second protrusion at least partially overlaps with the projection of the first protrusion in the first direction to limit the pole.

[0015] Optionally, the annular boss has an inclined annular circumferential wall, and the end of the annular circumferential wall away from the base shrinks toward the center of the annular boss, so that the annular circumferential wall and the base are set at an angle of θ, and the value range of θ is 45°-90°.

[0016] Optionally, along the first direction, the first boss has a first projection surface, the second boss has a second projection surface, the overlap degree between the second projection surface and the first projection surface is s, and the value range of s is 10%-100%.

[0017] Optionally, the first boss has a first surface close to the second bump, and a distance between the first surface and the second bump along the first direction is c, and a value range of c is 0.5 mm-3.5 mm.

[0018] Optionally, a dimension of the top cover along the first direction is a, a dimension of the second protrusion along the first direction is b, and a ratio of b to a ranges from 26% to 80%.

[0019] In a second aspect, the present application further discloses a battery, comprising the battery top cover assembly described in any one of the above items.

[0020] In the embodiment of the present application, the battery top cover assembly includes a top cover, a pole and a first plastic part; the top cover is provided with a pole hole, the pole is inserted into the pole hole, the axial direction of the pole is the first direction, the hole wall of the pole hole is provided with a base and a claw structure, the base and the claw structure are spaced apart in the first direction, and the base and the top cover are integrally formed; a cavity is formed between the base and the claw structure, and at least part of the pole is accommodated in the cavity; part of the first plastic part is located between the pole and the claw structure. In this way, since the base is provided, and the base and the top cover are integrally formed, the installation and fixation of the pole during the assembly of the battery top cover assembly are more convenient, which is conducive to improving the assembly efficiency of the battery top cover assembly. In addition, since the claw structure is provided, and the claw structure and the base are spaced apart in the first direction, the pole can be better fixed under the bearing effect of the base and the limiting effect of the claw structure, which is conducive to improving the structural strength of the pole.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is a schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0024] Figure 2 This is one of the structural schematic diagrams of a battery top cover assembly provided in an embodiment of the present application;

[0025] Figure 3 This is the second structural schematic diagram of a battery top cover assembly provided in an embodiment of the present application;

[0026] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle.

[0027] Figure numerals: 1. top cover, 11. pole hole, 111. base, 112. claw structure, 1121. annular boss, 1122. second protrusion, 2. pole, 21. first boss, 3. first plastic part, 4. sealing gasket, Z. first direction. DETAILED DESCRIPTION

[0028] The embodiments of the utility model will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] An embodiment of the present application provides a battery top cover assembly, and the battery top cover assembly of the present application is described in detail below in conjunction with the accompanying drawings.

[0033] Reference Figure 1 , showing a schematic diagram of the structure of a battery provided in an embodiment of the present application, referring to Figures 2 to 3 , showing a schematic diagram of the structure of a battery top cover assembly provided in an embodiment of the present application, referring to Figure 4 , showing Figure 3 A partial enlarged view of point B in the middle.

[0034] like Figures 2 to 3 As shown, an embodiment of the present application provides a battery top cover assembly, including a top cover 1, a pole 2 and a first plastic part 3; the top cover 1 is provided with a pole hole 11, the pole 2 is inserted into the pole hole 11, the axial direction of the pole 2 is a first direction, the hole wall of the pole hole 11 is provided with a base 111 and a claw structure 112, the base 111 and the claw structure 112 are spaced apart in the first direction, and the base 111 and the top cover 1 are integrally formed; a cavity is formed between the base 111 and the claw structure 112, and at least part of the pole 2 is accommodated in the cavity; part of the first plastic part 3 is located between the pole 2 and the claw structure 112.

[0035] In the embodiment of the present application, on the one hand, due to the provision of the base 111, the installation and fixation of the pole 2 during the assembly of the battery top cover assembly is more convenient, which is beneficial to improving the assembly efficiency of the battery top cover assembly; on the other hand, due to the provision of the claw structure 112, and the claw structure 112 and the base 111 are spaced apart in the first direction Z, that is, under the bearing effect of the base 111 and the limiting effect of the claw structure 112, the pole 2 can be better fixed, which is beneficial to improving the structural strength of the pole 2.

[0036] It should be noted that the axis of the pole 2 in the embodiment of the present application is perpendicular to the top cover 1. In one embodiment of the present application, the first plastic part 3 is an injection molding structure formed by filling the gap between the pole 2 and the top cover 1 by injection molding. Through the interaction of the first plastic part 3 with the pole 2, the base 111 of the top cover 1, and the claw structure 112, respectively, the pole 2 and the top cover 1 can be reliably connected together, which is beneficial to improve the compressive and torsional strength of the pole 2.

[0037] In some optional embodiments of the present application, the pole hole 11 has a first axis, and the base 111 protrudes from at least part of the hole wall of the pole hole 11 toward the first axis. This simplifies the structure of the base 111, facilitates processing, and helps improve the processing efficiency of the top cover 1.

[0038] In practical applications, the claw structure 112 can be integrally formed with the top cover 1, or can be separately formed with the top cover 1 and then connected, such as by welding. It is understandable that, compared with separate forming, when the base 111, the claw structure 112 and the top cover 1 are integrally formed, on the one hand, the connection strength between the base 111 and the top cover 1, and the claw structure 112 and the top cover 1 can be made higher; on the other hand, the assembly process can be reduced, and the assembly efficiency of the battery top cover assembly can be improved.

[0039] like Figure 4As shown, the dimension of the top cover 1 along the first direction Z is a, the dimension of the base 111 along the first direction Z is d, and the ratio range of d to a is 26% ≤ d / a < 100%, so that the base 111 has sufficient strength, which is conducive to improving the strength of the pole 2 after the battery top cover assembly is assembled. It should be noted that the embodiment of the present application does not limit the specific values ​​of the dimension a of the top cover 1 along the first direction Z and the dimension d of the base 111 along the first direction Z, and those skilled in the art can adjust them based on the ratio range of the two according to actual needs. In specific applications, taking into account the performance and manufacturing cost of the battery top cover assembly, the dimension a of the top cover 1 along the first direction Z is generally 1.5mm-3.0mm, and correspondingly, the dimension d of the base 111 along the first direction Z is generally 0.8mm-2.5mm, d≤a.

[0040] The following is an embodiment of the dimension d of the base 111 along the first direction Z and the dimension a of the top cover 1 along the first direction Z, as well as a characterization of test results.

[0041] Among them, the pole compressive strength test method is: apply vertical downward thrust along the upper surface of the pole, keep the top cover fixed, and continue to increase the thrust until the pole structure is damaged or the pole seal fails, and obtain the maximum tensile strength that the pole can withstand. The maximum compressive strength is required to be ≥1500N.

[0042] Table 1

[0043]

[0044] Referring to Table 1, the ratios of the dimension d of the base 111 along the first direction Z to the dimension a of the top cover 1 along the first direction Z are 20%, 26%, 30%, 40%, 50%, 60%, 70%, 80%, and 100% as examples.

[0045] It can be concluded from Table 1 that when d / a is less than 26%, the maximum compressive strength of the pole is less than 1500N, and the pole compressive strength test fails; when 26%≤d / a<100%, the maximum compressive strength of the pole is greater than or equal to 1500N, and the pole compressive strength test passes; when d / a=100%, there is no base, the pole limiting function cannot be achieved, and the pole compressive strength test fails.

[0046] In some optional embodiments of the present application, the pole 2 is provided with a first boss 21 along its circumference, and the first boss 21 is embedded between the base 111 and the claw structure 112 to prevent the pole 2 from being separated from the pole hole 11 .

[0047] In the embodiment of the present application, since the pole 2 is provided with a first boss 21, the pole 2 can be limited by embedding the first boss 21 between the base 111 and the claw structure 112, effectively preventing the pole 2 from being separated from the pole hole 11. In practical applications, after the pole 2 is installed between the base 111 and the claw structure 112, the gap between the pole 2 and the base 111 and the claw structure 112 is filled by injection molding to form the first plastic part 3. Since the first boss 21 is provided, a concave-convex structure is formed in the circumference of the solidified first plastic part 3. Under the concave-convex cooperation of the first plastic part 3 and the first boss 21, the rotation of the pole 2 relative to the top cover 1 can be effectively prevented, and the torsional strength of the pole 2 can be further improved.

[0048] It should be noted that one or at least two first bosses 21 can be provided in the embodiment of the present application; and when at least two first bosses 21 are provided, the at least two first bosses 21 can be provided at uniform intervals or non-uniform intervals along the circumference of the pole 2. The embodiment of the present application does not limit the number and manner of providing the first bosses 21, and those skilled in the art can adjust according to actual needs. It is understandable that when at least two first bosses 21 are provided, the at least two first bosses 21 are provided at uniform intervals along the circumference of the pole 2, so that the pole 2 can be subjected to uniform force along the circumference, which is beneficial to improving the torsional strength of the pole 2.

[0049] like Figure 4 As shown, the dimension of the top cover 1 along the first direction Z is a, the dimension of the first boss 21 along the first direction Z is e, and the ratio of e to a ranges from 20% to 80%, so that the first boss 21 has sufficient structural strength, which is conducive to improving the strength of the pole 2, thereby further improving the assembly reliability of the pole 2 and the top cover 1. It should be noted that the embodiment of the present application does not limit the specific values ​​of the dimension a of the top cover 1 along the first direction Z and the dimension e of the first boss 21 along the first direction Z, and those skilled in the art can adjust them based on the ratio range of the two according to actual needs. In specific applications, taking into account the performance and manufacturing cost of the battery top cover assembly, the dimension a of the top cover 1 along the first direction Z is generally 1.5mm-3.0mm, and correspondingly, the dimension e of the first boss 21 along the first direction Z is generally 0.6mm-2.4mm.

[0050] Among them, the pole tensile strength test method is: apply vertical upward thrust along the lower surface of the pole, keep the cover fixed, and continue to increase the thrust until the pole structure is damaged or the pole seal fails, and obtain the maximum tensile strength that the pole can withstand. The maximum tensile strength is required to be ≥1500N.

[0051] The following are embodiments and comparative examples in which the ratio of the dimension e of the first boss 21 along the first direction Z to the dimension a of the top cover 1 along the first direction Z is in the range of 20%-80%, and characterization of test results.

[0052] Table 2

[0053]

[0054] Referring to Table 2, the ratios of the dimension e of the first boss 21 along the first direction Z to the dimension a of the top cover 1 along the first direction Z are 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, and 90% as examples.

[0055] Therefore, when e / a is less than 20%, the thickness of the first boss is too small and the first boss is easily deformed, so the pole fails the tensile strength test. When e / a is greater than 80%, the thickness of the first boss is too large and the position of the claw set on the top cover is too small, resulting in the thickness of the claw being too small, so the pole fails the tensile strength test. Only when 20%≤e / a≤80% does the pole pass the tensile strength test. Setting 20%≤e / a≤80% within this range can make the first boss 21 have sufficient structural strength, which is beneficial to improving the strength of the pole 2, thereby further improving the assembly reliability of the pole 2 and the top cover 1.

[0056] In some optional embodiments of the present application, the claw structure 112 includes an annular boss 1121 and a second boss 1122; the annular boss 1121 protrudes from at least part of the hole wall of the pole hole 11 in a direction away from the base 111; the second boss 1122 is arranged at one end of the annular boss 1121 away from the base 111, and the second boss 1122 at least partially overlaps with the projection of the first boss 21 in the first direction Z to limit the pole 2.

[0057] In the embodiment of the present application, since an annular boss 1121 is provided, a second protrusion 1122 is provided at one end of the annular boss 1121 away from the base 111, and the torsional strength of the pole 2 can be improved by overlapping and pressing the second protrusion 1122 with the first protrusion 21 along the first direction Z. In practical applications, a gap is formed between two adjacent second protrusions 1122. During the process of assembling the pole 2 to the top cover 1, the first protrusion 21 is placed opposite to the gap so that the first protrusion 21 passes through the claw structure 112, and then the pole 2 is rotated so that the first protrusion 21 of the pole 2 partially overlaps with the second protrusion 1122 of the claw structure 112, which facilitates the assembly and fixation of the pole 2. It can be understood that, in order to facilitate the assembly of the pole 2, the outer dimensions of the gap formed between the two adjacent second protrusions 1122 should be greater than or equal to the outer dimensions of the first protrusion 21, so that the first protrusion 21 passes through the gap.

[0058] It should be noted that the number of second protrusions 1122 is consistent with the number of first bosses 21, and one second protrusion 1122 corresponds to one first boss 21. The torsional strength of the pole 2 can be further improved by pressing the second protrusions 1122 and the first bosses 21 in a one-to-one correspondence. For example, when the number of second protrusions 1122 is 3, the number of first bosses 21 can also be 3; for another example, when the number of second protrusions 1122 is 4, the number of first bosses 21 can also be 4. The embodiment of the present application does not limit the number of second protrusions 1122 and first bosses 21.

[0059] In a specific application, the second protrusion 1122 can be adapted to the shape of the first protrusion 21 so that the second protrusion and the first protrusion are pressed together. For example, the cross-sectional shape of the second protrusion 1122 and the first protrusion 21 along the direction perpendicular to the first direction Z may include but is not limited to a fan-shaped, rectangular, and other irregular shapes. The embodiment of the present application does not limit the cross-sectional shape of the second protrusion 1122 and the first protrusion 21 along the direction perpendicular to the first direction Z.

[0060] like Figure 4 As shown, the annular boss 1121 has an inclined annular circumferential wall, and the end of the annular circumferential wall away from the base 111 shrinks toward the center of the annular boss 1121, so that the annular circumferential wall and the base 111 are set at an angle of θ, and the value range of θ is 45°-90°.

[0061] In the embodiment of the present application, since the annular boss 1121 has an annular peripheral wall arranged obliquely, and the end of the annular peripheral wall away from the base 111 shrinks toward the center of the annular boss 1121, the annular boss 1121 and the base 111 can be enclosed to form a cavity for accommodating the pole 2, which is convenient for assembling the pole 2 to the top cover 1. Since the value range of the angle θ between the annular peripheral wall and the base 111 is 45°-90°, the pole 2 and the top cover 1 can have sufficient assembly strength, which is conducive to improving the overall structural strength of the battery top cover assembly.

[0062] The following is an embodiment in which the angle θ between the annular peripheral wall and the base 111 is in the range of 45°≤θ≤90°, and a characterization of the test results.

[0063] Pole tensile strength test method: Apply vertical upward thrust along the lower surface of the pole, keep the top cover fixed, and continue to increase the thrust until the pole structure is damaged or the pole seal fails, and obtain the maximum tensile strength that the pole can withstand. The maximum tensile strength is required to be ≥1500N.

[0064] Table 3

[0065] θ 30° 45° 60° 75° 90° Pole tensile strength NG OK OK OK OK

[0066] Referring to Table 3, the values ​​of the angle θ between the annular peripheral wall and the base 111 are 30°, 45°, 60°, 75°, and 90° as examples.

[0067] Therefore, when θ is less than 45°, the pole tensile strength test fails, and when the value range of θ is 45°≤θ≤90°, the pole tensile strength test passes, which can make the pole 2 and the top cover 1 have sufficient assembly strength, which is beneficial to improve the overall structural strength of the battery top cover assembly. When θ is greater than 90°, the pole processing is complicated and the manufacturing cost is significantly increased.

[0068] In some optional embodiments of the present application, along the first direction Z, the first boss 21 has a first projection surface, the second boss 1122 has a second projection surface, the overlap degree between the second projection surface and the first projection surface is s, and the value range of s is 10%-100%, so that the second boss 1122 and the first boss 21 overlap with each other, thereby improving the structural strength of the pole 2.

[0069] The following is an embodiment in which the overlap degree s between the second projection surface of the second protrusion 1122 in the first direction Z and the first projection surface of the first boss 21 in the first direction Z has a value range of 10%-100%, and a test result representation.

[0070] Among them, the pole tensile strength test method is: apply vertical upward thrust along the lower surface of the pole, keep the top cover fixed, and continue to increase the thrust until the pole structure is damaged or the pole seal fails, and obtain the maximum tensile strength that the pole can withstand. The pole tensile strength test requires the maximum tensile strength to be ≥1500N.

[0071] Table 4

[0072]

[0073] Referring to Table 4, the values ​​of the overlap s of the second projection surface of the second bump 1122 in the first direction Z and the first projection surface of the first boss 21 in the first direction Z are 5%, 10%, 20%, 40%, 60%, 80%, and 100% as examples.

[0074] It can be concluded from Table 4 that when the value range of s is 10%-100%, the second protrusion 1122 and the first boss 21 can have a sufficient action area, so that the claw structure 112 can better fix the pole 2, which is beneficial to improve the structural strength of the pole 2.

[0075] like Figure 4As shown, the first boss 21 has a first surface close to the second boss 1122, and the distance between the first surface and the second boss 1122 along the first direction Z is c, and the value range of c is 0.5mm-3.5mm, so that the pole 2 and the claw structure 112 have a sufficient insulation distance, which is beneficial to improve the insulation performance between the pole 2 and the top cover 1, and at the same time ensure that the second boss 1122 and the first boss 21 have sufficient contact area, thereby ensuring the tensile strength of the pole.

[0076] Insulation performance test method: Use an insulation tester to test the leakage current between the pole and the top cover (under 1500V DC voltage, lasting 2s, leakage current ≤2mA).

[0077] Pole tensile strength test method: Apply vertical upward thrust along the lower surface of the pole, keep the top cover fixed, and continue to increase the thrust until the pole structure is damaged or the pole seal fails, and obtain the maximum tensile strength that the pole can withstand. The pole tensile strength test requires the maximum tensile strength to meet ≥1500N.

[0078] The following is an embodiment in which the distance c between the first surface of the first boss 21 and the second bump 1122 along the first direction Z is in the range of 0.5 mm to 3.5 mm, and a characterization of the test results.

[0079] Table 5

[0080]

[0081] Referring to Table 5, the distance c between the first surface of the first boss 21 and the second bump 1122 along the first direction Z is taken as 0.4 mm, 0.5 mm, 1.0 mm, 1.3 mm, 1.5 mm, 2.0 mm, 3.5 mm, and 4.0 mm as examples.

[0082] Therefore, when the value range of c is c<0.5mm, the distance between the first boss 21 and the second bump 1122 is too small, and there is not enough space to set the insulating part, so the insulation performance does not meet the requirements. When the value range of c is c>3.5mm, the distance between the first boss 21 and the second bump 1122 is too large. Under the condition of a certain thickness of the top cover, the position of the claw is reduced, the thickness of the claw becomes thinner, the tensile strength of the pole does not meet the requirements, and the pole tensile strength test fails.

[0083] When the value range of c is 0.5mm≤c≤3.5mm, the pole 2 and the claw structure 112 have sufficient insulation distance, which is beneficial to improving the insulation performance between the pole 2 and the top cover 1. The insulation performance of the pole meets the requirements, and the tensile strength of the pole can also pass the test.

[0084] like Figure 4As shown, the dimension of the top cover 1 along the first direction Z is a, the dimension of the second protrusion 1122 along the first direction Z is b, and the ratio of b to a ranges from 26% to 80%, so that the claw structure 112 has sufficient structural strength, which is conducive to improving the fixing reliability of the pole 2 and further improving the strength of the pole 2. It should be noted that the embodiment of the present application does not limit the specific values ​​of the dimension a of the top cover 1 along the first direction Z and the dimension b of the second protrusion 1122 along the first direction Z, and those skilled in the art can adjust them based on the ratio range of the two according to actual needs. In specific applications, taking into account the performance and manufacturing cost of the battery top cover assembly, the dimension a of the top cover 1 along the first direction Z is generally 1.5mm-3.0mm, and correspondingly, the dimension b of the second protrusion 1122 along the first direction Z is generally 0.8mm-2.4mm.

[0085] Pole tensile strength test method: Apply vertical upward thrust along the lower surface of the pole, keep the top cover fixed, and continue to increase the thrust until the pole structure is damaged or the pole seal fails, and obtain the maximum tensile strength that the pole can withstand. The pole tensile strength test requires the maximum tensile strength to be ≥1500N.

[0086] Pole compressive strength test method: Apply vertical downward thrust along the upper surface of the pole, keep the top cover fixed, and continue to increase the thrust until the pole structure is damaged or the pole seal fails, and obtain the maximum tensile strength that the pole can withstand. The pole compressive strength test requires the maximum compressive strength to be ≥1500N.

[0087] The following is an embodiment of the ratio range of the dimension S of the second protrusion 1122 along the first direction Z to the dimension a of the top cover 1 along the first direction Z, and a characterization of the test results.

[0088] Table 6

[0089]

[0090] Referring to Table 6, the values ​​of the dimension b of the second protrusion 1122 along the first direction Z and the dimension a of the top cover 1 along the first direction Z are 20%, 26%, 40%, 50%, 60%, 70%, 80%, and 90% as embodiments.

[0091] Therefore, when b / a is less than 26%, the thickness of the second protrusion is too small, the claw is easily deformed, and the pole fails the tensile strength test. When b / a is greater than 80%, the thickness of the second boss is too large. Under the condition of a certain thickness of the top cover, the position for setting the substrate is reduced, the thickness of the base 111 becomes thinner, the compressive strength test of the pole is not satisfied, and the pole fails the compressive test. When the value range of b / a is 26%≤b / a≤80%, the claw structure 112 can have sufficient structural strength, and the pole passes the compressive and tensile tests, which is beneficial to improve the fixing reliability of the pole 2 and further improve the strength of the pole 2.

[0092] In some optional embodiments of the present application, the battery top cover assembly further includes a sealing gasket 4, which is sleeved outside the pole 2 and abuts against the base 111 to achieve a sealed connection between the pole 2 and the top cover 1, thereby avoiding leakage during battery use, which is beneficial to improving the safety of battery use. It should be noted that the types of the sealing gasket 4 include but are not limited to silicone pads, rubber pads, plastic pads or foam pads, and those skilled in the art can choose according to actual needs.

[0093] In summary, the battery top cover assembly provided by the embodiment of the present application has at least the following advantages:

[0094] In the embodiment of the present application, the battery top cover assembly includes a top cover, a pole and a first plastic part; the top cover is provided with a pole hole, the pole is inserted into the pole hole, the axial direction of the pole is the first direction, the hole wall of the pole hole is provided with a base and a claw structure, the base and the claw structure are spaced apart in the first direction, and the base and the top cover are integrally formed; a cavity is formed between the base and the claw structure, and at least part of the pole is accommodated in the cavity; part of the first plastic part is located between the pole and the claw structure. In this way, since the base is provided, the installation and fixation of the pole during the assembly of the battery top cover assembly is more convenient, which is conducive to improving the assembly efficiency of the battery top cover assembly. In addition, since the claw structure is provided, and the claw structure and the base are spaced apart in the first direction, the pole can be better fixed under the bearing effect of the base and the limiting effect of the claw structure, which is conducive to improving the structural strength of the pole.

[0095] like Figure 1 As shown, an embodiment of the present application further provides a battery, the battery comprising the battery top cover assembly described in any one of the above embodiments.

[0096] In the embodiment of the present application, the structure of the battery top cover assembly is the same as the structure of the battery top cover assembly described in any of the above embodiments, and its beneficial effects are also similar, which will not be repeated here.

[0097] It should be noted that the battery may specifically include a shell, a accommodating cavity with an opening is provided in the shell, a battery cell body is arranged in the accommodating cavity, and a battery top cover assembly is arranged on the opening side of the shell and covers the opening to seal and protect the battery cell body in the accommodating cavity, wherein the battery cell body refers to the structural main body of the battery, which may specifically include an electrolyte and a winding core, etc.

[0098] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0099] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery top cover assembly, characterized in that: The battery top cover assembly comprises a top cover (1), a pole (2) and a first plastic part (3); The top cover (1) is provided with a pole hole (11), the pole (2) is inserted into the pole hole (11), the axial direction of the pole (2) is a first direction (Z), the hole wall of the pole hole (11) is provided with a base (111) and a claw structure (112), the base (111) and the claw structure (112) are arranged at intervals in the first direction (Z), and the base (111) and the top cover (1) are integrally formed; A cavity is formed between the base (111) and the claw structure (112), and at least a portion of the pole (2) is accommodated in the cavity; Part of the first plastic part (3) is located between the pole (2) and the claw structure (112).

2. The battery top cover assembly according to claim 1, characterized in that: The pole hole (11) has a first axis, and the base (111) protrudes from at least a portion of the hole wall of the pole hole (11) in the direction of the first axis.

3. The battery top cover assembly according to claim 1, characterized in that: The size of the top cover (1) along the first direction (Z) is a, the size of the base (111) along the first direction (Z) is d, and the ratio of d to a is in the range of 26%≤d / a<100%.

4. The battery top cover assembly according to claim 1, characterized in that: The pole (2) is provided with a first boss (21) along its circumference, and the first boss (21) is embedded between the base (111) and the claw structure (112) to limit the pole (2) from escaping from the pole hole (11).

5. The battery top cover assembly according to claim 4, characterized in that: The size of the top cover (1) along the first direction (Z) is a, the size of the first boss (21) along the first direction (Z) is e, and the ratio of e to a ranges from 20% to 80%.

6. The battery top cover assembly according to claim 4, characterized in that: The claw structure (112) comprises an annular boss (1121) and a second boss (1122); The annular boss (1121) protrudes from at least part of the hole wall of the pole hole (11) in a direction away from the base (111); The second protrusion (1122) is arranged at one end of the annular boss (1121) away from the base (111), and the second protrusion (1122) at least partially overlaps with the projection of the first boss (21) in the first direction (Z) to limit the position of the pole (2).

7. The battery top cover assembly according to claim 6, characterized in that: The annular boss (1121) has an inclined annular circumferential wall, and one end of the annular circumferential wall away from the base (111) shrinks toward the center of the annular boss (1121), so that the annular circumferential wall and the base (111) are arranged at an angle θ, and the value range of θ is 45°-90°.

8. The battery top cover assembly according to claim 6, characterized in that: Along the first direction (Z), the first boss (21) has a first projection surface, the second convex block (1122) has a second projection surface, the overlap degree between the second projection surface and the first projection surface is s, and the value range of s is 10%-100%.

9. The battery top cover assembly according to claim 8, characterized in that: The first boss (21) has a first surface close to the second bulge (1122), and the distance between the first surface and the second bulge (1122) along the first direction (Z) is c, and the value range of c is 0.5 mm-3.5 mm.

10. The battery top cover assembly according to claim 6, characterized in that: The size of the top cover (1) along the first direction (Z) is a, the size of the second protrusion (1122) along the first direction is b, and the ratio of b to a ranges from 26% to 80%.

11. A battery, characterized in that: The battery comprises the battery top cover assembly according to any one of claims 1-10.

Images