Welding-free battery top cover

Abstract

The utility model discloses a welding-free battery top cover, and relates to the technical field of batteries. Comprising a cover body, a pole, a connecting piece, a bolt and a nut, an installation hole is formed in the cover body, the pole is installed in the installation hole, the bolt is arranged on the pole in a downward limiting mode, and a first through hole allowing the bolt to be inserted and penetrate through is formed in the connecting piece. And the bolt is inserted into the first through hole and is matched with the nut so as to tightly press and fix the connecting sheet on the lower end surface of the pole. According to the welding-free battery top cover disclosed by the utility model, the pole and the connecting piece are tightly attached and fixed through the nut and the bolt to replace a connecting mode of welding the pole and the connecting piece, so that the manufacturing cost of the top cover is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a welding-free battery top cover. Background Art

[0002] The battery cover is an important part of the lithium-ion battery structure. It plays a sealing role, protects the internal environment of the battery cell, and connects the inside and outside of the battery cell to conduct the electric energy through the pole. The cover is mainly composed of aluminum plate, pole, upper plastic, lower plastic, explosion-proof valve, explosion-proof valve membrane, and injection hole. The cover plate and the core package are connected by a connecting piece.

[0003] At present, the core pack and connecting piece, connecting piece and pole, pole and top cover of lithium-ion battery are all welded, and the welding method is usually laser welding. However, this welding method has problems such as high equipment cost and unstable welding quality. It also requires technicians to operate and adjust the equipment continuously, which is highly dependent on technicians and has certain requirements for the operating environment. In addition, the welding operation process will generate a lot of heat, which will melt the upper and lower plastics, which may cause the top cover to deform and cause the risk of leakage. Utility Model Content

[0004] The utility model provides a welding-free battery top cover, in which the pole and the connecting piece are tightly fixed to each other by nuts and bolts, replacing the connection mode of welding the pole and the connecting piece, thereby reducing the manufacturing cost of the top cover and solving the above technical problems.

[0005] The utility model solves the above-mentioned problem by providing a welding-free battery top cover, comprising a cover body, a pole, and a connecting plate, wherein the cover body is provided with a mounting hole, the pole is installed in the mounting hole, and further comprises a bolt and a nut, wherein the bolt is set on the pole for a downward limit, and the connecting plate is provided with a first through hole for the bolt to be inserted and passed through, and the bolt is inserted into the first through hole and cooperates with the nut to tightly fix the connecting plate to the lower end surface of the pole.

[0006] Furthermore, a second through hole is provided on the pole, a bolt is provided in the second through hole, and a lower end of the bolt extends downwardly out of the second through hole.

[0007] Furthermore, the second through hole is configured as a stepped through hole, and a stepped surface in the second through hole is used to cooperate with a nut end of the bolt to limit downward movement of the bolt.

[0008] Furthermore, it also includes a first sealing ring arranged between the stepped surface of the second through hole and the nut of the bolt.

[0009] Furthermore, the pole comprises a main column and an intermediate connecting plate body integrally arranged at the lower end of the main column, the main column is plugged into the mounting hole, and the intermediate connecting plate body is used for fitting and connecting with the connecting piece.

[0010] Furthermore, an annular groove is provided on the outer side of the main column, and an upper clamping portion is provided at the annular groove. The upper clamping portion is sleeved on the annular groove to cooperate with the middle connecting plate to form a clamping structure, thereby fixing the main column.

[0011] Furthermore, it also includes a second sealing ring arranged between the middle connecting plate body and the cover body, and the second sealing ring is also sleeved on the main column.

[0012] Furthermore, a first clamping positioning surface is provided on the upper surface of the connecting piece, and a second clamping positioning surface is correspondingly provided on the lower surface of the intermediate connecting plate body; the area of ​​the first clamping positioning surface is larger than the area of ​​the corresponding plane area on the connecting piece, and the area of ​​the second clamping positioning surface is larger than the area of ​​the corresponding plane area on the intermediate connecting plate body, and when the connecting piece is tightly attached to the intermediate connecting plate body, the first clamping positioning surface and the second clamping positioning surface are also correspondingly attached.

[0013] Furthermore, a third through hole is provided in the middle of the connecting sheet to facilitate the cell pole ear to extend upward into between the connecting sheet and the middle connecting plate body.

[0014] Furthermore, it also includes an auxiliary fixing member arranged between the intermediate connecting plate body and the connecting piece, the auxiliary fixing member includes an intermediate connecting column arranged downward on the intermediate connecting plate body and a clamping flange arranged at the lower end of the intermediate connecting column; the edge of the clamping flange extends in the diameter direction of the intermediate connecting column, and the distance from the upper end surface of the clamping flange to the intermediate connecting plate body is exactly equal to or less than the thickness of the connecting piece.

[0015] Furthermore, the second through hole is set as a two-stage stepped through hole, and the diameter of the upper first-stage through hole is smaller than the diameter of the lower second-stage through hole, the diameter of the second-stage through hole is equivalent to the diameter of the bolt, and a connecting thread for matching with the bolt is also provided in the second-stage through hole.

[0016] Beneficial effects of the utility model:

[0017] The utility model discloses a welding-free battery top cover, in which a nut is screwed upward on a bolt to push a connecting piece to move upward until the connecting piece is tightly attached to the lower end of a pole, thereby making the connecting piece contact and connect with the pole, thereby ensuring the current flow capacity thereof, and eliminating the need for welding connection, thereby effectively reducing the manufacturing cost of the battery top cover.

[0018] In addition, when the connecting piece is pressed upward against the middle connecting plate body of the pole, the connecting piece also cooperates with the middle connecting plate body to form a clamping structure for clamping and fixing the battery cell pole ear, and the battery cell pole ear and the connecting piece are connected through contact to ensure current output and input. It can also replace the transmission welding method to reduce the manufacturing cost of the battery top cover.

[0019] Moreover, the middle connecting plate cooperates with the upper clamping part to clamp and fix the pole, and then the pole is fixedly installed on the cover body. The pole does not need to be fixedly connected to the cover body by welding, which reduces the manufacturing cost of the battery top cover.

[0020] Even the top cover and the pole, the pole and the connecting plate, and the connecting plate and the battery cell tab are no longer welded, but instead a mechanical clamping and limiting structure is used to fix the connection to each other. The connection positions between the top cover and the pole, the pole and the connecting plate, the connecting plate and the battery cell tab, and the entire battery top cover will not have the so-called high-temperature deformation, high-temperature cracking and other connection quality problems, so that the current flow capacity of the manufactured battery top cover remains relatively stable, thereby improving the quality of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments of the utility model and are used together with the description to explain the principles of the utility model. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the utility model, rather than all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is the overall structural diagram of the welding-free battery top cover of this embodiment;

[0023] Figure 2 This is an exploded view of the overall structure of the welding-free battery top cover of this embodiment;

[0024] Figure 3 This is a cross-sectional view of the overall structure of the welding-free battery top cover of this embodiment;

[0025] Figure 4 is a structural diagram of the pole of this embodiment;

[0026] Figure 5 is a structural diagram of the connecting piece of this embodiment;

[0027] Figure 6 for Figure 3 A local enlarged view of point A in FIG.

[0028] Figure 7 for Figure 3 A local enlarged view of point B in FIG.

[0029] 1-cover body, 2-pole, 3-connecting plate, 4-mounting hole, 5-bolt, 6-nut, 7-first through hole, 8-second through hole, 9-first sealing ring, 10-main column, 11-middle connecting plate, 12-annular groove, 13-upper clamping portion, 14-second sealing ring, 15-first clamping positioning surface, 16-second clamping positioning surface, 17-third through hole, 18-auxiliary fixing member, 19-middle connecting column, 20-clamping flange (20). DETAILED DESCRIPTION

[0030] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0031] See also Figures 1 to 7 , a welding-free battery top cover of a specific embodiment of the utility model comprises a cover body 1, a pole 2, and a connecting piece 3. The cover body 1 is set as a rectangular cover plate structure in this embodiment. Both ends of the cover body 1 are provided with mounting holes 4, and a pole 2 is installed in each of the two mounting holes 4. The two poles 2 are one positive and one negative, and the lower ends of the two poles 2 are connected with connecting pieces 3. Moreover, a second through hole 8 is vertically opened on each pole 2, and a first through hole 7 is opened corresponding to the connecting piece 3 connected to the pole 2. A bolt 5 is also arranged in the second through hole 8, and the lower end of the bolt 5 also extends downward and passes through the first through hole 7 to be threadedly connected with the bolt 5. The nut 6 correspondingly presses and fixes the connecting piece 3 at the lower end of the pole 2 to realize the non-welding assembly between the pole 2 and the connecting piece 3.

[0032] In addition, in the present embodiment, the second through hole 8 is configured as a secondary stepped through hole. When the bolt 5 is set in the second through hole 8, its nut blocks and limits the stepped surface in the second through hole 8 to further limit the bolt 5 from falling downward out of the second through hole 8, thereby enabling the nut 6 to pass through the bolt 5 to fix the connecting plate 3 at the lower end of the pole 2.

[0033] In addition, in order to prevent the electrolyte from leaking out from the second through hole 8 or the external liquid from penetrating into the battery from the second through hole 8, a first sealing ring 9 is also provided on the stepped surface of the second through hole 8, and the first sealing ring 9 is spaced between the lower end surface of the nut of the bolt 5 and the stepped surface of the second through hole 8. The first sealing ring 9 is clamped after the bolt 5 is screwed upward to clamp the connecting piece 3 to seal the second through hole 8. Furthermore, in order to effectively adjust the pressure of the bolt 5 on the first sealing ring 9 to ensure that the first sealing ring 9 can play a normal sealing effect and will not fail due to excessive clamping, the diameter of the secondary through hole at the lower end of the second through hole 8 is set to be equivalent to the diameter of the bolt 5, and the hole wall of the secondary through hole at the lower end of the second through hole 8 is also provided with an internal connection thread adapted to the bolt 5, and the bolt 5 can be screwed upward or downward by cooperating with the secondary through hole at the lower end, thereby effectively adjusting its pressure on the first sealing ring 9, so that the first sealing ring 9 can play a normal sealing effect and will not be excessively clamped.

[0034] For further information, see Figure 2 and Figure 4 Taking the installation of the pole 2 to the installation hole 4 at the left end of the cover body 1 as an example, in this embodiment, the pole 2 includes a cylindrical main column 10 and a rectangular intermediate connecting plate body 11. The main column 10 is integrally arranged at the left end of the intermediate connecting plate body 11. The second through hole 8 vertically penetrates the main column 10 and the intermediate connecting plate body 11. The size of the intermediate connecting plate body 11 is equivalent to that of the connecting plate 3. When the connecting plate 3 is pressed to the lower end surface of the intermediate connecting plate body 11 by the bolt 5, it can cooperate with the intermediate connecting plate body 11 to clamp the pole ear of the battery cell in the battery, so that the pole ear of the battery cell is connected to the connecting plate 3 to achieve a non-welding connection between the pole ear of the battery cell and the connecting plate 3.

[0035] In addition, an auxiliary fixing part 18 for fixing the connecting piece 3 is also provided downwardly at the right end of the middle connecting plate body 11. The auxiliary fixing part 18 includes an middle connecting column 19 arranged vertically downwardly and a clamping flange 20 integrally arranged at the lower end of the middle connecting column 19. The edge of the clamping flange 20 extends in the diameter direction of the middle connecting column 19, and the distance from the upper end surface of the clamping flange 20 to the middle connecting plate body 11 is just equal to or less than the thickness of the connecting piece 3. A clamping channel for cooperating with the auxiliary fixing part 18 is correspondingly provided on the right side of the third through hole 17 of the connecting piece 3; the auxiliary fixing part 18 corresponds to fixing the right end of the connecting piece 3 by moving the middle connecting column 19 into the clamping channel and making the clamping flange 20 cooperate with the middle connecting plate body 11 to clamp and fix the connecting piece 3 body at the edge of the clamping channel, so as to further enhance the clamping force between the connecting piece 3 and the middle connecting plate body 11.

[0036] Moreover, in order to ensure that the battery cell pole ear can be clamped, increase the contact area between the battery cell pole ear and the connecting piece 3, improve the current performance, and facilitate the mutual clamping and positioning of the connecting piece 3 and the intermediate connecting plate body 11, the upper surface of the connecting piece 3 is provided with a first clamping positioning surface 15 formed by alternating multiple concave curved surfaces and multiple convex curved surfaces, and the lower surface of the intermediate connecting plate body 11 is also provided with a second clamping positioning surface 16 formed by alternating multiple concave curved surfaces and multiple convex curved surfaces, and each convex curved surface of the first clamping positioning surface 15 can be seamlessly fitted upward with the corresponding convex curved surface of the second clamping positioning surface 16, and each concave curved surface of the first clamping positioning surface 15 can also be seamlessly fitted upward with each corresponding convex curved surface of the second clamping positioning surface 16. The connecting piece 3 and the intermediate connecting plate body 11 can be completely opposite to each other through the first clamping positioning surface 15 and the second clamping positioning surface 16, and the battery cell ear is also clamped between the first clamping positioning surface 15 and the second clamping positioning surface 16 to increase its contact area with the connecting piece 3 and the intermediate connecting plate body 11, thereby improving the battery current performance.

[0037] In addition, since the battery cell tab is generally in the middle of the upper end of the battery cell, in order to clamp the battery cell tab, a third through hole 17 is also provided in the middle of the connecting piece 3 toward the center of the cover body 1, so that the battery cell tab can extend upward from the third through hole 17 to between the first clamping positioning surface 15 and the second clamping positioning surface 16, thereby facilitating the clamping connection between the battery cell tab and the connecting piece 3.

[0038] In other embodiments, the auxiliary solid member may also be arranged upward on the connecting sheet 3 .

[0039] Furthermore, an annular groove 12 is provided on the outer side of the main column 10. When the main column 10 is inserted into the mounting hole 4, an appropriate annular gap is left between the main column 10 and the mounting hole 4. The annular gap is used to set an upper clamping portion 13 made of plastic material. The upper end of the upper clamping portion 13 forms a limited step outside the mounting hole 4. A sleeve hole is provided in the middle of the upper clamping portion 13, and a clamping ring structure corresponding to the annular groove 12 is provided in the sleeve hole; the upper clamping portion 13 is correspondingly sleeved on the main column 10 and clamped and limited with the main column 10 at the annular groove 12, and the limiting step at its upper end cooperates with the intermediate connecting plate body 11 to be clamped and installed at the mounting hole 4, so as to realize non-welding installation between the pole 2 and the cover body 1.

[0040] Moreover, when the intermediate connecting plate body 11 cooperates with the clamping portion 13 to clamp the pole 2 to the corresponding mounting hole 4 on the cover body 1, in order to prevent the electrolyte in the battery from leaking out from the connecting gap between the mounting hole 4 and the main column 10, or external liquid from seeping into the connecting gap between the mounting hole 4 and the main column 10, a second sealing ring 14 is also sleeved at the root position of the lower end of the main column 10. The second sealing ring 14 can be pressed against the lower end of the annular connecting gap between the mounting hole 4 and the main column 10 under the pressure of the intermediate connecting plate body 11 to achieve a sealing effect.

[0041] Anything not mentioned above is applicable to the prior art.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A welding-free battery top cover, comprising a cover body (1), a pole (2), and a connecting piece (3), wherein a mounting hole (4) is provided on the cover body (1), and the pole (2) is mounted in the mounting hole (4), characterized in that: It also comprises a bolt (5) and a nut (6), wherein the bolt (5) is arranged on the pole (2) in a downwardly limited manner, and the connecting plate (3) is provided with a first through hole (7) for the bolt (5) to be inserted and passed through, and the bolt (5) is inserted into the first through hole (7) and cooperates with the nut (6) to tightly fix the connecting plate (3) on the lower end surface of the pole (2).

2. The welding-free battery top cover according to claim 1, characterized in that: A second through hole (8) is provided on the pole (2), and the bolt (5) is arranged in the second through hole (8), with the lower end of the bolt (5) extending downwardly out of the second through hole (8).

3. The welding-free battery top cover as claimed in claim 2, characterized in that: The second through hole (8) is configured as a stepped through hole, and a stepped surface in the second through hole (8) is used to cooperate with a nut end of the bolt (5) to limit the downward movement of the bolt (5).

4. The welding-free battery top cover as claimed in claim 3, characterized in that: It also includes a first sealing ring (9) arranged between the stepped surface of the second through hole (8) and the nut of the bolt (5).

5. The welding-free battery top cover according to claim 1, characterized in that: The pole (2) comprises a main column (10) and an intermediate connecting plate (11) integrally arranged at the lower end of the main column (10); the main column (10) is plugged into the mounting hole (4); and the intermediate connecting plate (11) is used for fittingly connecting with the connecting piece (3).

6. The welding-free battery top cover as claimed in claim 5, characterized in that: An annular clamping groove (12) is provided on the outer side of the main column (10), and an upper clamping portion (13) is provided at the annular clamping groove (12). The upper clamping portion (13) is sleeved on the annular clamping groove (12) to cooperate with the middle connecting plate (11) to form a clamping structure, thereby fixing the main column (10).

7. The welding-free battery top cover as claimed in claim 5, characterized in that: It also includes a second sealing ring (14) arranged between the intermediate connecting plate body (11) and the cover body (1), and the second sealing ring (14) is also sleeved on the main column (10).

8. The welding-free battery top cover as claimed in claim 5, characterized in that: A first clamping positioning surface (15) is also provided on the upper surface of the connecting piece (3), and a second clamping positioning surface (16) is correspondingly provided on the lower surface of the intermediate connecting plate body (11); the area of ​​the first clamping positioning surface (15) is larger than the area of ​​the corresponding plane area on the connecting piece (3), the area of ​​the second clamping positioning surface (16) is larger than the area of ​​the corresponding plane area on the intermediate connecting plate body (11), and when the connecting piece (3) is in close contact with the intermediate connecting plate body (11), the first clamping positioning surface (15) and the second clamping positioning surface (16) are also in close contact with each other.

9. The welding-free battery top cover as claimed in claim 5, characterized in that: A third through hole (17) is provided in the middle of the connecting sheet (3) to facilitate the cell pole lug to extend upwards into between the connecting sheet (3) and the middle connecting plate body (11).

10. The welding-free battery top cover according to claim 5, characterized in that: It also includes an auxiliary fixing member (18) arranged between the intermediate connecting plate body (11) and the connecting sheet (3), the auxiliary fixing member (18) including an intermediate connecting column (19) arranged downward on the intermediate connecting plate body (11) and a clamping flange (20) arranged at the lower end of the intermediate connecting column (19); the edge of the clamping flange (20) extends in the diameter direction of the intermediate connecting column (19), and the distance from the upper end surface of the clamping flange (20) to the intermediate connecting plate body (11) is exactly equal to or less than the thickness of the connecting sheet (3).

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