Battery cell top cover assembly

Abstract

The utility model relates to the technical field of battery cell top covers, and provides a battery cell top cover assembly, which comprises a cover plate, a pole, an adapter plate and an outer plastic plate, and is characterized in that the pole penetrates through and is fixed on the cover plate; the switching piece is fixedly arranged at one end of the pole and is electrically connected with the pole, the tab penetrates through the switching piece, and one end of the tab is fixedly and electrically connected to one side, close to the cover plate, of the switching piece; and the outer plastic plate is arranged between the cover plate and the adapter plate and is propped against the tab. According to the utility model, the outer plastic plate is arranged between the cover plate and the adapter plate, and the outer plastic plate is used for abutting against the tabs, so that the fixing firmness degree of the tabs and the adapter plate can be improved, and the normal operation of the battery cell is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of cell top covers, and particularly relates to a cell top cover assembly. Background Art

[0002] The top cover assembly is an important part of a power battery, which plays a role in sealing the cell housing to prevent electrolyte leakage and conducting the tab. When assembling the battery top cover, generally, the ultrasonic welding method is first used to connect the tab and the adapter plate, and then the laser welding method is used to connect the adapter plate and the pole column on the cover plate.

[0003] The invention patent with the patent publication number CN115458872A discloses an adapter plate for a secondary battery. The secondary battery includes a top cover and a cell assembly. The adapter plate includes an upper surface, a lower surface, and a tab assembly portion. When assembling the secondary battery, the upper surface faces the top cover, the lower surface faces the cell assembly, the tab assembly portion corresponds to the cell tab on the cell assembly, and the tab assembly portion is used for the corresponding cell tab to pass through and bend therefrom, so that the cell tab is attached to and electrically connected to the upper surface. The secondary battery using this adapter plate reduces the original space for folding the tab, improves the space utilization rate of the secondary battery in the height direction. After the tab is bent, it is electrically connected to the upper surface of the adapter plate, avoiding the short - circuit risks caused by tab redundancy, sinking, different relaxation states, etc., and improving the performance and service life of the secondary battery.

[0004] In the above - mentioned technical solution, in order to improve the space utilization rate of the cell in the height direction, the tab passes through the adapter plate and is fixed on the upper surface of the adapter plate. However, compared with the way of connecting the tab to the lower surface of the adapter plate, connecting the tab to the upper surface of the adapter plate will make the tab more tense. When the cell is affected by vibration, etc., it is easy to cause the tab to loosen from the adapter plate, affecting the normal operation of the cell. Summary of the Utility Model

[0005] In view of this, the utility model provides a cell top cover assembly, which improves the fixing firmness between the tab and the adapter plate on the premise of ensuring the space utilization rate of the cell, and ensures the normal use of the cell.

[0006] The technical solution of the utility model is realized as follows: The utility model provides a cell top cover assembly, including a cover plate, a pole column, an adapter plate, and an outer plastic plate. Among them,

[0007] The pole column is fixedly penetrated through the cover plate;

[0008] The adapter plate is fixedly arranged at one end of the pole column and is electrically connected thereto. The tab penetrates through the adapter plate, and one end of the tab is fixed and electrically connected to the side of the adapter plate close to the cover plate;

[0009] The outer plastic plate is disposed between the cover plate and the adapter piece and abuts against the tab.

[0010] Based on the above technical solutions, preferably, the cover plate includes a plate body and a sealing plate, wherein,

[0011] The plate body is provided with a mounting hole;

[0012] The sealing plate is fixedly disposed in the mounting hole and seals it;

[0013] The outer diameter of the outer plastic plate is not greater than the inner diameter of the mounting hole, and the side of the outer plastic plate away from the tab abuts against the outer plastic plate.

[0014] More preferably, the outer plastic plate is partially disposed in the mounting hole and abuts against the inner wall of the mounting hole.

[0015] More preferably, the mounting hole includes a first tapered hole and a second tapered hole. The first tapered hole is located at one end of the second tapered hole away from the adapter piece and is in communication with it. The two are coaxially arranged, and the inner diameter of the first tapered hole is greater than the inner diameter of the second tapered hole;

[0016] The outer diameters of the sealing plate and the outer plastic plate gradually increase in the direction from the adapter piece to the cover plate, and the sealing plate is fixedly disposed in the first tapered hole, and the outer plastic plate is disposed in the second tapered hole.

[0017] Based on the above technical solutions, preferably, it further includes an upper plastic plate. The upper plastic plate is abutted and disposed between the adapter piece and the cover plate, and a protection hole is provided inside it;

[0018] The outer plastic plate includes a holding plate and a holding protrusion, wherein,

[0019] The holding plate is abutted and disposed between the cover plate and the upper plastic plate;

[0020] The holding protrusion is fixedly disposed on the side of the holding plate away from the cover plate, penetrates through the protection hole, and abuts against the tab.

[0021] More preferably, it further includes a lower plastic plate. The lower plastic plate is abutted and disposed on the side of the adapter piece away from the cover plate, and an assembly hole for passing through the tab is provided in the lower plastic plate.

[0022] More preferably, the lower plastic plate is detachably and fixedly connected to the upper plastic plate.

[0023] More preferably, the upper plastic plate includes an insulating plate and a plurality of hooks, wherein,

[0024] The insulating plate and the lower plastic plate are respectively abutted and arranged on both sides of the adapter plate;

[0025] The hooks are fixedly arranged on the insulating plate and are engaged with the lower plastic plate.

[0026] More preferably, a receiving groove is formed on the lower plastic plate, the adapter plate is arranged in the receiving groove, and the insulating plate abuts against the lower plastic plate.

[0027] More preferably, a limiting groove is formed on the cover plate;

[0028] The upper plastic plate further includes a limiting rod, the limiting rod is fixedly arranged on the insulating plate and is engaged with the limiting groove.

[0029] A cell top cover assembly of the present utility model has the following beneficial effects compared with the prior art:

[0030] (1) By arranging an outer plastic plate between the cover plate and the adapter plate, and using the abutment of the outer plastic plate against the tab, the fixing firmness between the tab and the adapter plate can be improved, thereby ensuring the normal operation of the cell;

[0031] (2) By forming mounting holes on the plate body, enabling the outer plastic plate to pass through the mounting holes, and arranging a sealing plate on the mounting holes, the assembly of the top cover assembly can be facilitated, thereby improving the assembly efficiency of the cell;

[0032] (3) By arranging the upper plastic plate and the lower plastic plate, not only can the sealing performance and insulation performance between the adapter plate and the cover plate and the winding core be improved, but also the problem of damage to the tab and the adapter plate due to excessive abutment force of the outer plastic plate against the tab can be avoided, achieving a good protection effect. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 is an exploded view of a cell top cover assembly of the present utility model;

[0035] Figure 2 is a cross-sectional view of a cell top cover assembly of the present utility model;

[0036] Figure 3 is Figure 2 an enlarged view of part A in

[0037] Figure 4 a perspective view of the lower plastic plate in a cell top cover assembly of the present utility model;

[0038] Figure 5 a perspective view of the upper plastic plate in a cell top cover assembly of the present utility model;

[0039] Figure 6 a perspective view of the limiting groove in a cell top cover assembly of the present utility model.

[0040] Wherein: 1. Cover plate; 11. Plate body; 12. Sealing plate; 101. Mounting hole; 1011. First tapered hole; 1012. Second tapered hole; 102. Limiting groove; 2. Pole column; 3. Adapter piece; 4. Outer plastic plate; 41. Supporting plate; 42. Supporting protrusion; 5. Upper plastic plate; 51. Insulating plate; 52. Hook; 53. Limiting rod; 501. Protection hole; 6. Lower plastic plate; 601. Assembly hole; 602. Accommodating groove; 7. Tab. Specific embodiments

[0041] Next, in combination with the specific embodiments of the present utility model, the technical solutions in the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0042] As Figures 1-6 shown, a cell top cover assembly of the present utility model includes a cover plate 1, a pole column 2, an adapter piece 3, an outer plastic plate 4, an upper plastic plate 5, and a lower plastic plate 6.

[0043] Among them, the cover plate 1 is used to carry other components and seal the cell box body.

[0044] The pole column 2 is used to connect the pole column 2 of an electrical device or other cells. The pole column 2 passes through and is fixed on the cover plate 1, and is set in a sealed and insulated manner therewith.

[0045] The adapter piece 3 is used to conduct electricity between the pole column 2 and the tab 7. The adapter piece 3 is fixedly arranged at one end of the pole column 2 and is electrically connected thereto. The adapter piece 3 is arranged inside the cell box body. The tab 7 passes through the adapter piece 3, and one end of the tab 7 is fixed and electrically connected to the side of the adapter piece 3 close to the cover plate 1, as Figure 3As shown, the tab 7 passes through the adapter piece 3 and is welded to the upper surface of the adapter piece 3. For the way the tab 7 passes through the adapter piece 3, corresponding wire grooves can be opened on the adapter piece 3 to allow the tab 7 to pass through the wire grooves.

[0046] The outer plastic plate 4 is used to enhance the fixing firmness between the tab 7 and the adapter piece 3. The outer plastic plate 4 is arranged between the cover plate 1 and the adapter piece 3 and abuts against the tab 7, preventing the tab 7 from falling off the adapter piece 3 when the battery cell is affected by vibration or the like, and ensuring the structural strength of the top cover assembly and the overall performance of the battery cell.

[0047] To facilitate the assembly of the outer plastic plate 4, as Figure 1 shown, the cover plate 1 includes a plate body 11 and a sealing plate 12. Among them, an installation hole 101 is opened on the plate body 11; the sealing plate 12 is fixedly arranged in the installation hole 101 and seals it; the outer diameter of the outer plastic plate 4 is not greater than the inner diameter of the installation hole 101, and the side of the outer plastic plate 4 away from the tab 7 abuts against the outer plastic plate 4; that is, when assembling the battery cell, other components except the outer plastic plate 4 and the sealing plate 12 can be assembled first, and then the outer plastic plate 4 and the sealing plate 12 are sequentially installed in the installation hole 101, and finally the plate body 11 and the sealing plate 12 are welded.

[0048] As Figure 3 shown, the outer plastic plate 4 is partially arranged in the installation hole 101 and abuts against the inner wall of the installation hole 101, so as to prevent the outer plastic plate 4 from shaking in the installation hole 101, and thus will not affect the connection of the tab 7, improving the fixing stability of the tab 7.

[0049] As Figure 3 shown, the installation hole 101 includes a first tapered hole 1011 and a second tapered hole 1012. The first tapered hole 1011 is located at one end of the second tapered hole 1012 away from the adapter piece 3 and is connected to it. The two are coaxially arranged, and the inner diameter of the first tapered hole 1011 is larger than the inner diameter of the second tapered hole 1012; the outer diameters of the sealing plate 12 and the outer plastic plate 4 gradually increase along the direction from the adapter piece 3 to the cover plate 1, and the sealing plate 12 is fixedly arranged in the first tapered hole 1011, and the outer plastic plate 4 is arranged in the second tapered hole 1012; by using the tapered design of the installation hole 101, the sealing plate 12 and the outer plastic plate 4 can be conveniently inserted into the installation hole 101. Also, because the inner diameter of the first tapered hole 1011 is larger than the inner diameter of the second tapered hole 1012, the sealing plate 12 will abut against the bottom side of the first tapered hole 1011, preventing the problem that the outer plastic plate 4 is pushed to damage the tab 7 and the adapter piece 3 due to the continuous downward pressure of the sealing plate 12, playing a certain protective role.

[0050] The upper plastic plate 5 is used to improve the insulation and sealing performance between the adapter plate 3 and the cover plate 1. The upper plastic plate 5 is disposed in abutting contact between the adapter plate 3 and the cover plate 1, and a protection hole 501 is formed inside it; the outer plastic plate 4 includes a supporting plate 41 and a supporting protrusion 42. Among them, the supporting plate 41 is disposed in abutting contact between the cover plate 1 and the upper plastic plate 5; the supporting protrusion 42 is fixedly disposed on one side of the supporting plate 41 away from the cover plate 1, penetrates through the protection hole 501, and abuts against the tab 7; as Figure 3 shown, since the upper plastic plate 5 abuts against the adapter plate 3, when the supporting plate 41 abuts against the upper plastic plate 5 and the supporting protrusion 42 abuts against the tab 7, if a downward force is continuously applied to the supporting plate 41, the supporting plate 41 will press down the adapter plate 3, rather than allowing the supporting protrusion 42 to continuously abut against the tab 7, causing damage to the tab 7, thus also achieving a good protection effect.

[0051] The lower plastic plate 6 is used to improve the insulation and sealing performance between the adapter plate 3 and the core. As Figure 4 shown, the lower plastic plate 6 is disposed in abutting contact on the side of the adapter plate 3 away from the cover plate 1, and an assembly hole 601 for passing through the tab 7 is formed in the lower plastic plate 6. The tab 7 first passes through the assembly hole 601, then penetrates through the adapter plate 3 and is fixed to the adapter plate 3.

[0052] Preferably, the lower plastic plate 6 and the upper plastic plate 5 are detachably and fixedly connected; specifically, as Figure 5 shown, the upper plastic plate 5 includes an insulating plate 51 and a plurality of hooks 52. Among them, the insulating plate 51 and the lower plastic plate 6 are respectively disposed in abutting contact on both sides of the adapter plate 3; the hooks 52 are fixedly disposed on the insulating plate 51 and are engaged with the lower plastic plate 6, thereby preventing the lower plastic plate 6 and the upper plastic plate 5 from sliding relative to each other and affecting the normal operation of the adapter plate 3.

[0053] In order to improve the fixing firmness of the lower plastic plate 6, the upper plastic plate 5 and the adapter plate 3, as Figure 1 shown, a receiving groove 602 is formed in the lower plastic plate 6, the adapter plate 3 is disposed in the receiving groove 602, and the insulating plate 51 abuts against the lower plastic plate 6.

[0054] Similarly to the above, as Figure 5 and Figure 6 shown, a limiting groove 102 is formed in the cover plate 1; the upper plastic plate 5 further includes a limiting rod 53, the limiting rod 53 is fixedly disposed on the insulating plate 51 and is engaged with the limiting groove 102, thereby integrating the lower plastic plate 6, the upper plastic plate 5, the adapter plate 3 and the cover plate 1, and preventing the above structures from sliding relative to each other during the operation of the battery cell and affecting the overall performance of the battery cell.

[0055] An assembly method of a battery cell top cover assembly of the present utility model is as follows:

[0056] First, pass the tab 7 through the assembly hole 601 and weld it to the side of the adapter plate 3 close to the cover plate 1. Then, fix the lower plastic plate 6, the adapter plate 3, the upper plastic plate 5, the plate body 11 and the pole column 2. Next, let the plate body 11 block and fix the battery cell box body, and sequentially install the outer plastic plate 4 and the sealing plate 12 in the mounting hole 101, so that the outer plastic plate 4 abuts against the tab 7. Finally, weld the sealing plate 12 and the plate body 11.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery cell top cover assembly, characterized in that: It includes a cover plate (1), a terminal post (2), a connecting piece (3) and an outer plastic plate (4). Among them, The terminal post (2) is fixedly penetrated on the cover plate (1); The connecting piece (3) is fixedly arranged at one end of the terminal post (2) and is electrically connected to it. The tab (7) penetrates through the connecting piece (3), and one end of the tab (7) is fixed and electrically connected to the side of the connecting piece (3) close to the cover plate (1); The outer plastic plate (4) is arranged between the cover plate (1) and the connecting piece (3) and abuts against the tab (7).

2. The cell top cover assembly according to claim 1, characterized in that: The cover plate (1) includes a plate body (11) and a sealing plate (12). Among them, An installation hole (101) is formed in the plate body (11); The sealing plate (12) is fixedly arranged in the installation hole (101) and seals it; The outer diameter of the outer plastic plate (4) is not greater than the inner diameter of the installation hole (101), and the side of the outer plastic plate (4) away from the tab (7) abuts against the outer plastic plate (4).

3. The cell top cover assembly according to claim 2, characterized in that: The outer plastic plate (4) is partially arranged in the installation hole (101) and abuts against the inner wall of the installation hole (101).

4. The cell top cover assembly according to claim 3, characterized in that: The installation hole (101) includes a first tapered hole (1011) and a second tapered hole (1012). The first tapered hole (1011) is located at one end of the second tapered hole (1012) away from the connecting piece (3) and is communicated with it. The two are coaxially arranged, and the inner diameter of the first tapered hole (1011) is larger than the inner diameter of the second tapered hole (1012); The outer diameters of the sealing plate (12) and the outer plastic plate (4) gradually increase along the direction from the connecting piece (3) to the cover plate (1). The sealing plate (12) is fixedly arranged in the first tapered hole (1011), and the outer plastic plate (4) is arranged in the second tapered hole (1012).

5. The cell top cover assembly according to claim 1, wherein: It further includes an upper plastic plate (5). The upper plastic plate (5) is abutted and arranged between the connecting piece (3) and the cover plate (1), and a protection hole (501) is formed inside it; The outer plastic plate (4) includes a abutting plate (41) and an abutting protrusion (42). Among them, The abutting plate (41) is abutted and arranged between the cover plate (1) and the upper plastic plate (5); The abutting protrusion (42) is fixedly arranged on the side of the abutting plate (41) away from the cover plate (1). It penetrates through the protection hole (501) and abuts against the tab (7).

6. The cell top cover assembly according to claim 5, wherein: It further includes a lower plastic plate (6). The lower plastic plate (6) is abutted and arranged on the side of the connecting piece (3) away from the cover plate (1), and an assembly hole (601) for passing through the tab (7) is formed in the lower plastic plate (6).

7. The cell top cover assembly according to claim 6, characterized in that: The lower plastic plate (6) is detachably and fixedly connected to the upper plastic plate (5).

8. The cell top cover assembly according to claim 7, wherein: The upper plastic plate (5) includes an insulating plate (51) and a plurality of hooks (52). Among them, The insulating plate (51) and the lower plastic plate (6) are respectively abutted and arranged on both sides of the connecting piece (3); The hook (52) is fixedly arranged on the insulating board (51) and is clamped with the lower plastic board (6).

9. The cell top cover assembly according to claim 8, characterized in that: A receiving groove (602) is formed on the lower plastic board (6), the adapter piece (3) is arranged in the receiving groove (602), and the insulating board (51) is in abutment with the lower plastic board (6).

10. A cell top cover assembly according to claim 8, characterized in that: A limiting groove (102) is formed on the cover plate (1); The upper plastic board (5) further includes a limiting rod (53), the limiting rod (53) is fixedly arranged on the insulating board (51) and is clamped with the limiting groove (102).

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