Upper cover terminal structure and battery cell module

Abstract

The utility model relates to battery module technical field, specifically disclose the upper cover terminal structure and electric core module, this upper cover terminal structure includes: upper cover, pole, the embedding in upper cover, the upper end of pole is equipped with with its same direction extension's upper pole hole, the upper pole hole includes the coaxial setting main body section and extension section, and extension section is located in the upper end or lower end of main body section, and the length L2 of extension section is not less than 2mm, locking screw is connected with upper pole hole thread, to lock the electric connection terminal and attach in pole, locking screw is threaded in main body section and extension section, and locking screw is at least connected with main body section thread. The upper cover terminal structure can solve the reliable connection problem of electric connection terminal.

Description

Technical Field

[0001] This utility model relates to the field of battery module technology, and in particular to the top cover terminal structure and cell module. Background Technology

[0002] In existing battery cell modules, electrical connection terminals are usually attached to the battery terminals by screws. During operation, the electrical connection terminals are first placed in the predetermined position on the terminal, and then the screws are screwed into the threaded holes of the terminal. Pressure is applied to achieve fastening, thus realizing a mechanical and electrical connection.

[0003] When the electrical connection terminal itself is thin, even if the screw is tightened to the deepest part of the terminal thread hole, the resulting clamping force may not be sufficient to reliably secure the terminal, resulting in inadequate locking. A common industry practice is to add an extra washer, but this not only increases the number of individual parts, but the washer is also prone to loss, increasing material management costs. Furthermore, it makes the assembly process more cumbersome, significantly impacting production efficiency and manufacturing costs. Utility Model Content

[0004] The purpose of this utility model is to provide a top cover terminal structure and a battery cell module to solve the problem of reliable connection of electrical connection terminals.

[0005] This utility model provides a top cover terminal structure for use in a battery cell module, the top cover terminal structure comprising:

[0006] Top cover;

[0007] An electrode post is fitted into the upper cover. The upper end of the electrode post is provided with an upper electrode post hole extending in the same direction as it. The upper electrode post hole includes a main body section and an extension section arranged coaxially. The extension section is located at the upper or lower end of the main body section. The length L2 of the extension section is not less than 2mm.

[0008] A locking screw is threaded into the upper pole hole to lock the electrical connection terminal to the pole. The locking screw passes through the main body section and the extension section, and the locking screw is threaded into at least the main body section.

[0009] As an optional technical solution, the upper cover terminal structure further includes a spring washer and a flat washer. The locking screw passes through the spring washer and the flat washer in sequence. The lower surface of the flat washer presses against the electrical connection terminal. Let the length of the main body section be L1, the screw length of the locking screw be L3, the smooth rod length of the locking screw be L4, the minimum thickness of the spring washer be H1, the minimum thickness of the flat washer be H2, and the length of the extension section L2>L3+L4-H1-H2-L1.

[0010] As an optional technical solution, let the reserved tolerance gap be K, and the formula for calculating the length of the extension section is: L2=L3-H1-H2-L1+K, where the reserved tolerance gap K is not less than 0.2mm.

[0011] As an optional technical solution, the pole includes a body part and an upper protrusion part, the upper protrusion part is disposed at the upper end of the body part, and the extension section is disposed at the upper end of the main body part and formed on the upper protrusion part.

[0012] As an optional technical solution, the height M of the upper convex portion is equal to the length L2 of the extension segment.

[0013] As an optional technical solution, let the usable height above the top cover be N, the nut height of the locking screw be H3, the thickness of the electrical connection terminal be H4, the thickness of the body protruding from the top cover be H5, and the height of the upper protrusion be M. <N-H4-H3-H1-H2-H5。

[0014] As an optional technical solution, the height M of the upper protrusion does not exceed 7.3 mm; or

[0015] The height M of the upper protrusion does not exceed 18.8 mm.

[0016] As an optional technical solution, the outer diameter D1 of the upper protrusion is larger than the outer diameter D2 of the body.

[0017] As an optional technical solution, the upper end of the upper pole post hole is provided with a groove and a chamfer, and the large end of the chamfer is connected to the lower end of the groove;

[0018] Let the depth of the recess be L5, the inner diameter of the recess be D3, the outer diameter of the shank of the locking screw be D4, the depth at the intersection of the locking screw and the chamfer be (D3-D4) / 2, and the length of the portion of the shank of the locking screw that extends through the spring washer and the flat washer be L6 = L4-H1-H2, (D3-D4) / 2+L5>L6.

[0019] As an optional technical solution, the depth L5 of the settling tank is not less than 1 mm; and / or

[0020] The depth H6 of the chamfer is not less than 1 mm.

[0021] As an optional technical solution, the pole post is provided with an extension in the middle, and the extension section is located at the lower end of the main body section and formed in the extension section.

[0022] As an optional technical solution, the extension section is a threaded hole, and the inner diameter of the extension section is equal to the inner diameter of the main body section; or,

[0023] The extension section is a light aperture, and the inner diameter of the extension section is larger than the inner diameter of the main body section.

[0024] As an optional technical solution, the electrode post is further provided with a lower electrode post hole, which is located at the lower end of the electrode post and coaxially arranged with the upper electrode post hole. The depth of the upper electrode post hole is greater than the depth of the lower electrode post hole, and the depth difference between the two is not less than 2mm.

[0025] As an optional technical solution, the nut of the locking screw is an external hexagonal nut.

[0026] The top cover terminal structure has at least the following beneficial effects:

[0027] This top-cover terminal structure effectively solves the problem of difficulty in locking thin electrical connection terminals due to insufficient terminal hole depth by setting an extension section with a length of not less than 2mm in the upper terminal hole. The extension section is coaxially arranged with the main body section, together forming a threaded hole with a deepened structure. When the locking screw is screwed in, its threaded part can not only fully engage with the main body section, but also extend further into the extension section, increasing the effective engagement length of the screw. This ensures that even if the electrical connection terminal itself is thin, the screw can obtain sufficient screwing stroke, thereby generating and maintaining a reliable axial clamping force, firmly pressing the electrical connection terminal onto the terminal end face. This design avoids the cumbersome process of adding additional gaskets to thin terminals, simplifies the assembly process, is particularly suitable for mass production, and also reduces material management costs. By optimizing the terminal structure itself, the operability and reliability of the connection are fundamentally guaranteed.

[0028] This utility model also provides a battery cell module, including a module body and a top cover terminal structure as described above, wherein the top cover is installed on the upper end of the module body.

[0029] This battery cell module has at least the following beneficial effects:

[0030] This battery module is connected to the electrical connection terminal via a top cover terminal structure. The top cover terminal structure effectively solves the problem of difficulty in locking thin electrical connection terminals due to insufficient terminal hole depth by incorporating an extension section of at least 2mm in length within the upper terminal hole. The extension section is coaxially arranged with the main body section, together forming a threaded hole with a deepened structure. When the locking screw is screwed in, its threaded portion not only fully engages with the main body section but also extends further into the extension section, increasing the effective engagement length of the screw. This ensures that even with a thin electrical connection terminal, the screw can obtain sufficient screwing stroke, thereby generating and maintaining reliable axial clamping force to firmly press the electrical connection terminal onto the terminal end face. This design avoids the cumbersome process of adding additional gaskets to thin terminals, simplifies the assembly process, is particularly suitable for mass production, and reduces material management costs. By optimizing the terminal structure itself, the operability and reliability of the connection are fundamentally guaranteed. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the battery cell module in one embodiment of the present invention;

[0032] Figure 2 This is an exploded view of the upper cover terminal structure in one embodiment of the present invention. Figure 1 ;

[0033] Figure 3 This is an exploded view of the upper cover terminal structure in one embodiment of the present invention. Figure 2 ;

[0034] Figure 4 This is a schematic diagram of the pole post structure in one embodiment of the present invention;

[0035] Figure 5 This is a cross-sectional view of the upper cover terminal structure in another embodiment of the present invention;

[0036] Figure 6 This is a cross-sectional view of the pole in another embodiment of the present invention.

[0037] In the picture:

[0038] 1. Pole post; 10. Upper pole post hole; 101. Main body section; 102. Extension section; 103. Countersunk groove; 104. Inverted hole; 20. Lower pole post hole; 11. Body part; 12. Upper convex part;

[0039] 2. Top cover; 3. Locking screw; 31. Screw; 32. Slip bar; 33. Nut; 4. Spring washer; 5. Flat washer;

[0040] 100. Electrical connection terminal; 200. Module body. Detailed Implementation

[0041] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0045] like Figures 1 to 6 As shown, this embodiment provides a battery cell module, which includes a module body 200 and an upper cover terminal structure. The upper cover terminal structure includes an upper cover 2, a terminal post 1, and a locking screw 3. The upper cover 2 is installed on the upper end of the module body 200. The terminal post 1 is embedded in the upper cover 2 and passes through the upper and lower sides of the upper cover 2. The upper end of the terminal post 1 is provided with an upper terminal post hole 10 extending in the same direction as it. The central axis of the upper terminal post hole 10 coincides with the central axis of the terminal post 1. The locking screw 3 is threadedly connected to the upper terminal post hole 10 to lock the electrical connection terminal 100 to the terminal post 1.

[0046] Furthermore, the upper pole hole 10 includes a main body section 101 and an extension section 102 coaxially arranged. The extension section 102 is located at the upper or lower end of the main body section 101. The locking screw 3 passes through the main body section 101 and the extension section 102. The locking screw 3 passing through here refers to the following situations: the locking screw 3 can completely penetrate the main body section 101 and / or the extension section 102, or the lower end of the locking screw 3 can only penetrate down to the depth range of the main body section 101 or the extension section 102, and the locking screw 3 is at least threadedly connected to the main body section 101. The length L2 of the extension section 102 is not less than 2mm.

[0047] Specifically, the battery module provided in this embodiment is connected to the electrical connection terminal 100 through an upper cover terminal structure. The upper cover terminal structure effectively solves the problem of difficulty in locking the thin electrical connection terminal 100 due to insufficient hole depth of the pole 1 by setting an extension section 102 with a length of not less than 2mm in the upper pole hole 10. The extension section 102 is coaxially arranged with the main body section 101, and together they form a threaded hole with a deepened structure. When the locking screw 3 is screwed in, its threaded part can not only fully engage with the main body section 101, but also extend further into the extension section 102, which increases the effective engagement length of the screw. This ensures that even if the electrical connection terminal 100 itself is thin, the screw can obtain sufficient screwing stroke, thereby generating and maintaining a reliable axial clamping force to firmly press the electrical connection terminal 100 onto the end face of the pole 1. This design avoids the cumbersome process of adding additional gaskets to thin terminals, simplifies the assembly process, is particularly suitable for mass production, and also reduces material management costs. By optimizing the structure of the pole 1 itself, the operability and reliability of the connection are essentially guaranteed.

[0048] For example, the upper cover terminal structure also includes a spring washer 4 and a flat washer 5. The locking screw 3 passes through the spring washer 4 and the flat washer 5 in sequence. When the locking screw 3 locks the electrical connection terminal 100 to the pole post 1, the nut 33 presses the lower surface of the flat washer 5 against the electrical connection terminal 100 below it through the spring washer 4.

[0049] For example, regarding the design of the length L2 of the extension section 102, let the length of the main body section 101 be L1, the length of the screw 31 of the locking screw 3 be L3, the length of the smooth rod 32 of the locking screw 3 be L4, the minimum thickness of the spring washer 4 be H1, and the minimum thickness of the flat washer 5 be H2. The length L2 of the extension section 102 is greater than L3 + L4 - H1 - H2 - L1. Even if the thickness of the electrical connection terminal 100 is close to zero, the locking screw 3 can be fully inserted and tightened into the upper pole hole 10, ensuring effective locking of the thin electrical connection terminal 100.

[0050] Furthermore, considering the tolerances inherent in machining, a certain tolerance clearance needs to be reserved when designing the length of the extension section 102. Let the reserved tolerance clearance be K. The formula for calculating the length of the extension section 102 is: L2 = L3 + L4 - H1 - H2 - L1 + K, where the reserved tolerance clearance K is not less than 0.2mm. Taking a main section 101 with a length of 10.5mm, a locking screw 3 using an M8X16 screw, H1 being 1.9mm, H2 being 1.8mm, and K being 0.2mm as an example, the length of the extension section 102 is L2 = 16mm - 1.9mm - 1.8mm - 10.5mm + 0.2mm = 2mm.

[0051] For example, the pole post 1 includes a body portion 11 and an upper protrusion 12. The upper protrusion 12 is located at the upper end of the body portion 11, and the extension section 102 is located at the upper end of the body portion 101 and formed on the upper protrusion 12. By providing the upper protrusion 12, the overall height of the pole post 1 is increased, thereby providing sufficient space for the addition of the extension section 102.

[0052] For example, the height M of the upper protrusion 12 is equal to the length L2 of the extension 102.

[0053] In some embodiments, an extension portion may be provided in the middle of the pole post 1. The extension section 102 is provided at the lower end of the main body section 101 and formed in the extension portion. The extension section 102 is preferably a threaded hole structure to increase the effective locking stroke of the locking screw 3. The space for the addition of the extension section 102 is provided by increasing the size of the pole post 1 sinking relative to the upper cover 2.

[0054] In some embodiments, the outer diameter D1 of the upper protrusion 12 is equal to the outer diameter D2 of the body portion 11; while in another embodiment, such as Figure 4 and Figure 5 As shown, the outer diameter D1 of the upper protrusion 12 is larger than the outer diameter D2 of the body portion 11. Since the upper protrusion 12 directly receives the electrical connection terminal 100, the larger outer diameter provides it with a larger force-bearing area, thereby reducing the pressure on the upper surface of the pole post 1 and improving the stability of the connection structure. It should be noted that the outer diameter D2 of the body portion 11 mentioned here refers to the outer diameter of the portion of its upper end exposed on the upper cover 2 excluding the upper protrusion 12.

[0055] Exemplarily, the maximum settable height of the upper convex portion 12 is related to the size of the housing of the cell module. Let the available height above the upper cover 2 be N, the height of the nut 33 of the locking screw 3 be H3, the thickness of the electrical connection terminal 100 be H4, the thickness by which the main body portion 11 protrudes from the upper cover 2 be H5, and the height M of the upper convex portion 12 satisfies M<N-H4-H3-H1-H2-H5. Taking the group31 national standard 100L housing, the electrical connection terminal 100 with a thickness of 2mm, and the nut 33 with a total height of 9.2mm together with the spring washer and flat washer as an example, the difference N-H5 between the available height above the upper cover 2 and the thickness by which the main body portion 11 protrudes from the upper cover 2 is 18.5mm, M<18.5-2-9.2=7.3mm, and the height M of the upper convex portion 12 is set to be less than 7.3mm. If the housing is changed to the group8D national standard 250L specification, the difference N-H5 between the available height above the upper cover 2 and the thickness by which the main body portion 11 protrudes from the upper cover 2 is 30mm, M<30-2-9.2=18.8mm, and the height M of the upper convex portion 12 is set to be less than 18.8mm.

[0056] Exemplarily, as Figures 2-6 shown, the upper end of the upper pole post hole 10 is provided with a counterbore 103 and a countersink 104, the large end of the countersink 104 is connected to the lower end of the counterbore 103. Let the depth of the counterbore 103 be L5, the inner diameter of the counterbore 103 be D3, the outer diameter of the smooth shank 32 of the locking screw 3 be D4, D3 is larger than D4, the depth of the intersection of the locking screw 3 and the countersink 104 is (D3-D4) / 2, the length L6 of the portion of the smooth shank 32 of the locking screw 3 that extends out of the spring washer 4 and the flat washer 5 is L6=L4-H1-H2. When in the critical thread stripping state, the lowest point of the countersink 104 is its intersection with the smooth shank 32, and the total depth from the intersection to the upper end of the upper pole post hole 10 is (D3-D4) / 2+L5, which needs to be greater than the length L6 of the extending portion of the smooth shank 32, that is, (D3-D4) / 2+L5>L6, which can prevent the thread stripping phenomenon between the smooth shank 32 of the locking screw 3 and the internal thread of the upper pole post hole 10.

[0057] Preferably, the difference between D3 and D4 is greater than 2mm.

[0058] Exemplarily, the depth L5 of the counterbore 103 is no less than 1mm.

[0059] Specifically, regarding the dimension design of the countersink 104, the chamfer size of the countersink 104 is 45°, the depth of the countersink 104 is equal to the difference between the radii of its large end and small end, let the depth of the countersink 104 be H6, H6 is no less than 1mm, and preferably, H6 is 1.5mm in this embodiment.

[0060] Taking the locking screw 3 as an example, which is an M8X16 screw of GB9074.13-1988 standard, with H1 of 1.9mm and H2 of 1.8mm, the inner diameter D3 of the countersunk groove 103 is 9.8mm, the outer diameter D4 of the smooth rod 32 is 7.52±0.1mm, the depth L5 of the countersunk groove 103 is taken as the minimum value of 1mm, and the depth H6 of the chamfered hole 104 is taken as 1.5mm. The total depth from the intersection of the locking screw 3 and the chamfered hole 104 to the upper end of the upper pole post hole 10 is (D3-D4) / 2+L5, which is between 2.09mm and 2.19mm. The length L4 of the smooth rod 32 is 4.43mm, and the length L6 of the smooth rod 32 that extends out is 4.43mm-1.9mm-1.8mm=0.73mm. The total depth from the intersection to the upper end of the upper pole post hole 10 is significantly greater than the length of the smooth rod 32 that extends out, so there will be no tooth grinding phenomenon.

[0061] For example, the inner diameter D3 of the recess 103 is smaller than the maximum outer diameter of the disc-shaped structure where the electrical connection terminal 100 abuts against the pole post 1, to prevent the electrical connection terminal 100 from sinking into the recess 103. Taking the electrical connection terminal 100 as an example using an SC25-8 terminal, its maximum outer diameter of the disc-shaped structure is 13mm, and the corresponding inner diameter D3 of the recess 103 is taken as the maximum value of 13mm. In this example, the inner diameter of the large end of the chamfer 104 is 8.8mm, and the depth H6 of the chamfer 104 is 1mm. Other parameters remain unchanged. The total depth from the intersection of the locking screw 3 and the chamfer 104 to the upper end of the upper pole post hole 10 is (8.8-D4) / 2+L5, which is between 1.59mm and 1.69mm. The length L6 of the protruding rod 32 is still 0.73mm. The total depth from the intersection to the upper end of the upper pole post hole 10 is still greater than the length of the protruding rod 32, so there will be no tooth grinding phenomenon.

[0062] For example, in some embodiments, the extension 102 may be configured as a threaded hole structure to be threadedly connected to the locking screw 3, and the inner diameter of the extension 102 is equal to the inner diameter of the main body 101. In other embodiments, the extension 102 is a smooth hole, and the inner diameter of the extension 102 is larger than the inner diameter of the main body 101, so as to serve as a portion to avoid the locking screw 3.

[0063] For example, such as Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the pole post 1 is also provided with a lower pole post hole 20. The lower pole post hole 20 is located at the lower end of the pole post 1 and is coaxially arranged with the upper pole post hole 10. The depth of the upper pole post hole 10 is greater than the depth of the lower pole post hole 20, and the depth difference between the two is not less than 2mm.

[0064] For example, such as Figures 1-3 As shown, the nut 33 of the locking screw 3 is an external hexagonal nut 33, which makes it easy for operators to tighten or unlock and can avoid stripping.

[0065] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A top cover terminal structure for a battery cell module, characterized in that, The upper cover terminal structure includes: Top cover (2); The pole post (1) is fitted into the upper cover (2). The upper end of the pole post (1) is provided with an upper pole post hole (10) extending in the same direction as it. The upper pole post hole (10) includes a main body section (101) and an extension section (102) arranged coaxially. The extension section (102) is located at the upper end or the lower end of the main body section (101). The length L2 of the extension section (102) is not less than 2mm. A locking screw (3) is threaded into the upper pole hole (10) to lock the electrical connection terminal (100) to the pole (1). The locking screw (3) passes through the main body section (101) and the extension section (102), and the locking screw (3) is threaded into at least the main body section (101).

2. The upper cover terminal structure according to claim 1, characterized in that, The upper cover terminal structure also includes a spring washer (4) and a flat washer (5). The locking screw (3) passes through the spring washer (4) and the flat washer (5) in sequence. The lower surface of the flat washer (5) presses against the electrical connection terminal (100). Let the length of the main body section (101) be L1, the length of the screw (31) of the locking screw (3) be L3, the length of the smooth rod (32) of the locking screw (3) be L4, the minimum thickness of the spring washer (4) be H1, the minimum thickness of the flat washer (5) be H2, and the length of the extension section (102) be L2>L3+L4-H1-H2-L1.

3. The upper cover terminal structure according to claim 2, characterized in that, it is provided with The reserved tolerance gap is K, and the length calculation formula of the extension section (102) is: L2=L3+L4-H1-H2-L1+K, wherein the reserved tolerance gap K is not less than 0.2mm.

4. The upper cover terminal structure according to claim 2, characterized in that, The pole post (1) includes a body part (11) and an upper protrusion (12). The upper protrusion (12) is located at the upper end of the body part (11), and the extension section (102) is located at the upper end of the main body section (101) and formed on the upper protrusion (12).

5. The upper cover terminal structure according to claim 4, characterized in that, The height M of the upper protrusion (12) is equal to the length L2 of the extension (102).

6. The upper cover terminal structure according to claim 4, characterized in that, it is provided with The usable height above the top cover (2) is N, the height of the nut (33) of the locking screw (3) is H3, the thickness of the electrical connection terminal (100) is H4, the thickness of the body part (11) protruding from the top cover (2) is H5, and the height of the upper protrusion (12) is M. <N-H4-H3-H1-H2-H5。 7. The upper cover terminal structure according to claim 6, characterized in that, The height M of the upper protrusion (12) does not exceed 7.3 mm; or The height M of the upper protrusion (12) does not exceed 18.8 mm.

8. The upper cover terminal structure according to claim 4, characterized in that, The outer diameter D1 of the upper protrusion (12) is greater than the outer diameter D2 of the body part (11).

9. The upper cover terminal structure according to claim 2, characterized in that, The upper end of the upper pole post hole (10) is provided with a groove (103) and a chamfer (104), and the large end of the chamfer (104) is connected to the lower end of the groove (103); Let the depth of the sink groove (103) be L5, the inner diameter of the sink groove (103) be D3, the outer diameter of the smooth rod (32) of the locking screw (3) be D4, the depth at the intersection of the locking screw (3) and the chamfer (104) be (D3-D4) / 2, and the length of the part of the smooth rod (32) that passes through the spring washer (4) and the flat washer (5) be L6=L4-H1-H2, (D3-D4) / 2+L5>L6.

10. The upper cover terminal structure according to claim 9, characterized in that, The depth L5 of the settling tank (103) is not less than 1 mm; and / or The depth H6 of the chamfer (104) is not less than 1 mm.

11. The upper cover terminal structure according to claim 1, characterized in that, An extension portion is provided in the middle of the pole post (1), and the extension section (102) is provided at the lower end of the main body section (101) and formed in the extension portion.

12. The upper cover terminal structure according to any one of claims 1-11, characterized in that, The extension section (102) is a threaded hole, and the inner diameter of the extension section (102) is equal to the inner diameter of the main body section (101); or, The extension segment (102) is a light aperture, and the inner diameter of the extension segment (102) is larger than the inner diameter of the main body segment (101).

13. The upper cover terminal structure according to any one of claims 1-11, characterized in that, The pole post (1) is also provided with a lower pole post hole (20). The lower pole post hole (20) is located at the lower end of the pole post (1) and is coaxially arranged with the upper pole post hole (10). The depth of the upper pole post hole (10) is greater than the depth of the lower pole post hole (20), and the depth difference between the two is not less than 2 mm.

14. The upper cover terminal structure according to any one of claims 1-11, characterized in that, The nut (33) of the locking screw (3) is an external hexagonal nut (33).

15. A battery cell module, comprising a module body (200) and a top cover terminal structure as described in any one of claims 1-14, wherein the top cover (2) is mounted on the upper end of the module body (200).

Images