Battery cell cover plate assembly and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell cover plate assembly and a battery pack, and the battery cell cover plate assembly mainly comprises a cover plate body, a pole, an insulating rubber ring and an insulating plate. A mounting hole is formed in the cover plate body; the pole comprises a pole body as well as a riveting part and a limiting part which are positioned at the upper end and the lower end of the pole body, the pole body is arranged in the mounting hole, a sealing ring is arranged between the pole body and the mounting hole, and a mounting space is defined by the riveting part, the limiting part and the pole body; the insulating rubber ring is sleeved outside the pole body and is arranged between the riveting part and the cover plate body; the insulating plate is provided with a first through hole, and the sealing ring is arranged in the first through hole in a penetrating manner; and the riveting part and the limiting part clamp parts of the insulating rubber ring, the sealing ring and the insulating plate in the mounting space. By utilizing the riveting part and the limiting part at the upper end and the lower end of the pole body, the insulating rubber ring, the sealing ring and the insulating plate are partially clamped in the mounting space, so that the overall structure is simplified, and the production efficiency and the space utilization rate are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cell cover plate assembly and a battery pack. Background Art

[0002] With the development of new energy technologies, battery packs are increasingly used in various new energy products. In a battery pack, a pole column is connected to a tab of a cell through a connecting piece to achieve electrical conduction.

[0003] Currently, the pole column is generally integrally arranged on the cell cover plate assembly, and the insulating and sealing effects of the pole column are ensured by plastics, sealing rings, etc. However, the structure of the existing cell cover plate assembly is relatively complex, and the installation processes of the pole column, plastics, sealing rings, etc. are rather cumbersome, resulting in low production efficiency of the cell cover plate assembly and low space utilization rate inside the cell cover plate assembly. Summary of the Utility Model

[0004] In view of this, the utility model provides a cell cover plate assembly and a battery pack to solve the problems that the structure of the cell cover plate assembly is relatively complex, resulting in low production efficiency and low internal space utilization rate.

[0005] In a first aspect, the utility model provides a cell cover plate assembly, comprising:

[0006] A cover plate body provided with an installation hole;

[0007] A pole column, including a pole column body, a riveting part and a limiting part located at the upper and lower ends of the pole column body, the pole column body is arranged in the installation hole and a sealing ring is provided between the pole column body and the installation hole; the riveting part and the limiting part extend outside the installation hole and enclose an installation space with the pole column body;

[0008] An insulating rubber ring sleeved outside the pole column body and arranged between the riveting part and the cover plate body;

[0009] An insulating plate arranged inside the cover plate body, the insulating plate is provided with a first through hole, and the sealing ring passes through the first through hole;

[0010] The riveting part and the limiting part clamp a part of the insulating rubber ring, the sealing ring and the insulating plate at the installation space.

[0011] Advantageous Effects: In the embodiment of the utility model, the pole column is installed through the installation hole of the cover plate body, and then the riveting part and the limiting part at the upper and lower ends of the pole column body clamp a part of the insulating rubber ring, the sealing ring and the insulating plate at the installation space, without other fixing and positioning structures, simplifying the overall structure of the cell cover plate assembly, facilitating installation and use, thereby improving the production efficiency of the cell cover plate assembly and also improving the space utilization rate of the cell cover plate assembly.

[0012] In an alternative embodiment, a first step is formed on the outer periphery of the upper end of the pole column body, and the first step serves as the riveting portion. A second step is formed on the outer periphery of the lower end of the pole column body, and the second step serves as the limiting portion. The bottom surface of the riveting portion, the outer periphery of the pole column body, and the top surface of the limiting portion form a mounting groove, and the mounting groove serves as the mounting space.

[0013] Advantageous effects: Before installing the insulating rubber ring, the sealing ring, and the insulating plate, the first step extends along the height direction of the pole column body. After installing the insulating rubber ring, the sealing ring, and the insulating plate, the first step is bent so that it extends along the radial direction of the pole column body, thereby clamping the insulating rubber ring, the sealing ring, and the insulating plate between the first step and the second step. The connection is firm, which can effectively ensure the structural strength and the structure is simple.

[0014] In an alternative embodiment, the sealing ring is sleeved outside the pole column body and is arranged between the insulating rubber ring and the limiting portion.

[0015] Advantageous effects: The insulating rubber ring is located above the sealing ring and plays the roles of insulation and sealing. The sealing ring is arranged between the insulating rubber ring and the limiting portion, which can further improve the sealing effect.

[0016] In an alternative embodiment, the insulating plate is provided with a boss. The boss is axially drilled to form the first through hole. The top of the boss abuts against the cover plate body, and the bottom of the boss abuts against the limiting portion.

[0017] Advantageous effects: The top of the boss of the insulating plate abuts against the cover plate body, and the bottom of the boss abuts against the limiting portion. That is, the boss is clamped between the cover plate body and the limiting portion. The boss can be used to achieve a positioning effect, improve the structural stability of the insulating plate, and does not occupy additional space.

[0018] In an alternative embodiment, a third step corresponding to the first step is formed on the upper surface of the insulating rubber ring.

[0019] Advantageous effects: The insulating rubber ring is fixed by the third step, which is beneficial to improving the installation stability of the insulating rubber ring.

[0020] In an alternative embodiment, the pole column is provided with an axial through hole. A connecting piece corresponding to the pole column is further provided on the inner side of the cover plate body. One end of the connecting piece is provided with a protruding portion, and the side wall of the protruding portion is connected to the hole wall of the axial through hole.

[0021] Beneficial effects: The connecting piece is used to connect the pole column and the pole ear. The connecting piece is provided with a protruding portion connected to the hole wall of the axial through hole. On the one hand, the cooperation between the protruding portion and the axial through hole can be used for auxiliary positioning. On the other hand, it does not occupy extra space and also reduces the weight of the pole column and the connecting piece, which is beneficial to lightweight design.

[0022] In an optional implementation manner, the cover body is provided with a second through hole along the length direction, and one end of the connecting piece extends to the second through hole and is adapted to be connected to the pole ear of the battery cell.

[0023] Beneficial effects: Setting the second through hole can leave an installation space for the connecting piece and the pole ear, reduce the installation thickness of the connecting piece and the pole ear, and is beneficial to improving the space utilization rate of the battery cell cover assembly.

[0024] In an optional implementation manner, a pad is provided at the upper end of the part where the connecting piece extends to the second through hole, and one end of the pole ear is bent and welded to the pad.

[0025] Beneficial effects: Directly welding the pole ear to the pad on the connecting piece after bending can reduce the number of welding and bending times of the connecting piece and the pole ear, thereby improving the production efficiency of the battery cell.

[0026] In an optional implementation manner, the cover body is further provided with a sealing plate for sealing the second through hole, and liquid injection holes and explosion-proof valves are arranged at intervals on the sealing plate.

[0027] Beneficial effects: The sealing plate is used to seal the second through hole, and the liquid injection hole is used for injecting electrolyte. The explosion-proof valve opens when the internal pressure of the battery cell is greater than the preset pressure, so that the chamber inside the battery cell is connected to the outside through the explosion-proof valve and the high-pressure gas is discharged to prevent the internal pressure of the battery cell from being too high and exploding. Arranging the liquid injection hole and the explosion-proof valve on the sealing plate can also increase the welding area between the connecting piece and the pole ear and improve the over-current capacity of the battery cell.

[0028] In a second aspect, the present utility model further provides a battery pack, including:

[0029] Multiple battery cells, the battery cells include a housing, one side of the housing is provided with an opening, a plurality of pole groups arranged in the opening, and a plurality of pairs of pole ears corresponding to the pole groups one by one;

[0030] The above-mentioned battery cell cover assembly, the cover body is covered on the opening of the housing.

[0031] Beneficial effects: Since the battery pack includes the cell cover plate assembly, it has the same effects as the cell cover plate assembly, that is, the pole column is installed through the mounting hole of the cover plate body, and then the insulating rubber ring, sealing ring and part of the insulating plate are clamped at the installation space by the riveting part and limiting part at the upper and lower ends of the pole column body, without other fixing and positioning structures, which simplifies the overall structure of the cell cover plate assembly, facilitates installation and use, thereby improving the production efficiency of the cell cover plate assembly and also improving the space utilization rate of the cell cover plate assembly. Description of the Drawings

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 Structural schematic diagram of a cell cover plate assembly according to an embodiment of the present invention;

[0034] Figure 2 Cross-sectional view of a cell cover plate assembly according to an embodiment of the present invention

[0035] Figure 3 For Figure 2 Enlarged view of part A in

[0036] Figure 4 Partial structural schematic diagram of a cell cover plate assembly before the pole ear is bent according to an embodiment of the present invention;

[0037] Figure 5 Partial structural schematic diagram of a cell cover plate assembly according to an embodiment of the present invention.

[0038] Explanation of the reference numerals in the drawings:

[0039] 1. Cover plate body; 101. Second through hole; 2. Pole column; 201. Pole column body; 202. Riveting part; 203. Limiting part; 3. Sealing ring; 4. Insulating rubber ring; 5. Insulating plate; 501. Boss; 6. Connecting piece; 601. Protruding part; 602. Pad; 7. Sealing plate; 8. Liquid injection hole; 9. Explosion-proof valve; 10. Housing; 11. Pole group; 12. Pole ear. Detailed Embodiments

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0041] The following combination Figures 1 to 5 , describing the embodiments of the present utility model.

[0042] According to an embodiment of the present invention, on the one hand, Figures 1 to 3 As shown, a cell cover assembly is provided, which mainly includes: a cover body 1, a pole 2, an insulating rubber ring 4 and an insulating plate 5. The cover body 1 is provided with a mounting hole. The pole 2 includes a pole body 201 and a rivet portion 202 and a limit portion 203 located at the upper and lower ends of the pole body 201. The pole body 201 is arranged in the mounting hole and a sealing ring 3 is provided between the pole body 201 and the mounting hole. The rivet portion 202 and the limit portion 203 extend outside the mounting hole and form an installation space with the pole body 201. The insulating rubber ring 4 is sleeved on the outside of the pole body 201 and is arranged between the rivet portion 202 and the cover body 1. The insulating plate 5 is arranged on the inner side of the cover body 1, and the insulating plate 5 is provided with a first through hole, and the sealing ring 3 is passed through the first through hole. The rivet portion 202 and the limit portion 203 clamp the insulating rubber ring 4, the sealing ring 3 and parts of the insulating plate 5 in the installation space.

[0043] The battery cell cover assembly provided by the embodiment of the present invention installs the pole 2 through the mounting hole of the cover body 1, and then uses the rivet parts 202 and the limiting parts 203 at the upper and lower ends of the pole body 201 to clamp the insulating rubber ring 4, the sealing ring 3 and part of the insulating plate 5 in the installation space. No other fixing and positioning structures are required, which simplifies the overall structure of the battery cell cover assembly, facilitates installation and use, thereby improving the production efficiency of the battery cell cover assembly and improving the space utilization of the battery cell cover assembly.

[0044] Specifically, the poles 2 are arranged in pairs, including a positive pole and a negative pole. Correspondingly, the mounting holes are a pair of circular holes, spaced apart at opposite ends of the cover body 1. The insulating rubber ring 4 provides both insulation and sealing. The sealing ring 3 further ensures the tightness of the poles 2. The insulating plate 5 prevents short circuits between the positive and negative poles.

[0045] It should be noted that the material of the cover body 1 is not limited in the embodiments of the present utility model. For example, the cover body 1 can be made of polished aluminum plate. Nor is the material of the sealing ring 3 limited. For example, the sealing ring 3 can be a conventional sealing ring such as a rubber sealing ring or a silica gel sealing ring. In addition, the materials of the insulating rubber ring 4 and the insulating plate 5 are not limited either. For example, both the insulating rubber ring 4 and the insulating plate 5 can be made of plastic parts.

[0046] In one embodiment, as Figure 2 and Figure 3 shown, a first step is formed on the outer periphery of the upper end of the pole column body 201, and the first step serves as the riveting part 202. A second step is formed on the outer periphery of the lower end of the pole column body 201, and the second step serves as the limiting part 203. The bottom surface of the riveting part 202, the outer periphery of the pole column body 201, and the top surface of the limiting part 203 form an installation groove, and the installation groove serves as an installation space.

[0047] Before installing the insulating rubber ring 4, the sealing ring 3, and the insulating plate 5, the first step extends along the height direction of the pole column body 201. After installing the insulating rubber ring 4, the sealing ring 3, and the insulating plate 5, the first step is bent so that it extends along the radial direction of the pole column body 201, thereby clamping the insulating rubber ring 4, the sealing ring 3, and the insulating plate 5 between the first step and the second step. The connection is firm, which can effectively ensure the structural strength and the structure is simple.

[0048] The top and bottom directions of the embodiments of the present utility model are as Figure 3 shown. The height direction of the pole column body 201 is also the direction of the top and bottom arrows in Figure 3 .

[0049] Further, in one embodiment, as Figure 3 shown, the sealing ring 3 is sleeved outside the pole column body 201 and is arranged between the insulating rubber ring 4 and the limiting part 203. The insulating rubber ring 4 is located above the sealing ring 3 and serves to insulate and seal. The sealing ring 3 is arranged between the insulating rubber ring 4 and the limiting part 203, which can further improve the sealing effect.

[0050] Furthermore, in one embodiment, as Figure 3 shown, the insulating plate 5 is provided with a boss 501, and the boss 501 is axially drilled to form a first through hole. The top of the boss 501 abuts against the bottom surface of the cover body 1, and the bottom of the boss 501 abuts against the top surface of the limiting part 203. That is, the boss 501 is clamped between the cover body 1 and the limiting part 203. The boss 501 can be used to achieve a positioning effect, improve the structural stability of the insulating plate 5, and does not occupy extra space.

[0051] In one embodiment, as Figure 3As shown, a third step corresponding to the first step is formed on the upper surface of the insulating rubber ring 4. The third step is used to fix the insulating rubber ring 4, which is beneficial to improving the installation stability of the insulating rubber ring 4.

[0052] In one embodiment, Figure 3 As shown, the pole 2 is provided with an axial through hole, and the inner side of the cover body 1 is also provided with a connecting piece 6 corresponding to the pole 2. A protrusion 601 is provided at one end of the connecting piece 6, and the side wall of the protrusion 601 is connected to the hole wall of the axial through hole. The connecting piece 6 is used to connect the pole 2 and the tab 12. The tab 12 is provided with a positive tab and a negative tab corresponding to the pole 2. The connecting piece 6 is provided with a protrusion 601 connected to the hole wall of the axial through hole. On the one hand, the protrusion 601 can be used to assist in positioning by cooperating with the axial through hole. On the other hand, it does not take up additional space and also reduces the weight of the pole 2 and the connecting piece 6, which is conducive to lightweight design.

[0053] Specifically, the connecting piece 6 corresponds to the pole 2 one by one, and a pair is also provided. One of the connecting pieces 6 connects the positive pole and the positive tabs of the plurality of pole groups 11, and the other connecting piece 6 connects the negative pole and the negative tabs of the plurality of pole groups 11. The connecting piece 6 needs to be conductive to achieve electrical conduction between the tab 12 and the pole 2. A gap is left between the two connecting pieces 6 to prevent the positive pole and the negative pole from short-circuiting. The bottom of the connecting piece 6 is provided at the top of the pole group 11, and the tab 12 is bent and attached to the top surface of the connecting piece 6.

[0054] In order to prevent the protruding portion 601 of the connecting piece 6 from affecting the use of the pole 2 and occupying space in the height direction, the upper surface of the protruding portion 601 does not exceed the upper surface of the pole 2 .

[0055] In one embodiment, Figure 4 As shown, the cover body 1 is provided with a second through hole 101 along its length. One end of the connecting piece 6 extends to the second through hole 101 and is suitable for connecting to the battery cell's tab 12. The provision of the second through hole 101 can reserve space for the connecting piece 6 and the tab 12 to be installed, reducing the installation thickness of the connecting piece 6 and the tab 12, thereby improving the space utilization of the battery cell cover assembly.

[0056] Specifically, the length direction of the cover body 1 is as follows: Figure 1 As shown by the arrow L. The connecting piece 6 and the tab 12 are both strip-shaped to expand the contact area between them and improve the connection strength. The second through hole 101 is a rectangular through hole to adapt to the shape of the tab 12 and the connecting piece 6. The length direction of the rectangular through hole is consistent with the length direction of the cover body 1. A pair of poles 2 are located on opposite sides of the length direction of the rectangular through hole, which can stagger the poles 2, connecting piece 6, and tab 12 to avoid the thickness of the three being superimposed and improve space utilization.

[0057] In one embodiment, Figure 5As shown, a part of the upper end of the connecting piece 6 extending to the second through hole 101 is provided with a pad 602, and one end of the tab 12 is bent and welded to the pad 602. Directly welding the tab 12 to the pad 602 on the connecting piece 6 after bending can reduce the number of welding and bending operations between the connecting piece 6 and the tab 12, thereby improving the production efficiency of the battery cell. The welding can be achieved by conventional welding processes such as laser welding or ultrasonic welding.

[0058] In one embodiment, as Figure 1 and Figure 2 shown, the cover body 1 is further provided with a sealing plate 7 for sealing the second through hole 101. The sealing plate 7 is provided with liquid injection holes 8 and explosion-proof valves 9 at intervals. The sealing plate 7 is used to seal the second through hole 101, and the liquid injection holes 8 are used for injecting electrolyte. The explosion-proof valve 9 opens when the internal air pressure of the battery cell is greater than the preset air pressure, so that the chamber inside the battery cell communicates with the outside through the explosion-proof valve 9 and discharges the high-pressure gas, so as to prevent the internal air pressure of the battery cell from being too high and causing an explosion. Arranging the liquid injection holes 8 and the explosion-proof valves 9 on the sealing plate 7 can also increase the welding area between the connecting piece 6 and the tab 12 and improve the over-current capacity of the battery cell.

[0059] According to an embodiment of the present invention, on the other hand, as Figure 4 shown, a battery pack is further provided, which mainly includes: a plurality of battery cells and a battery cell cover assembly. The battery cell includes a housing 10, one side of the housing 10 is provided with an opening, a plurality of electrode groups 11 arranged in the opening, and a plurality of pairs of tabs 12 corresponding to the electrode groups 11 one by one. The cover body 1 of the battery cell cover assembly covers the opening of the housing 10.

[0060] Since the battery pack includes a battery cell cover assembly and has the same effect as the battery cell cover assembly, that is, the pole column 2 is installed through the installation hole of the cover body 1, and then the insulating rubber ring 4, the sealing ring 3 and part of the insulating plate 5 are clamped at the installation space by the riveting parts 202 and the limiting parts 203 at the upper and lower ends of the pole column body 201, without other fixing and positioning structures, simplifying the overall structure of the battery cell cover assembly, facilitating installation and use, thereby improving the production efficiency of the battery cell cover assembly and also improving the space utilization rate of the battery cell cover assembly.

[0061] Specifically, the housing 10 has a cavity inside, and a plurality of electrode groups 11 are stacked and arranged in the cavity. A plurality of pairs of electrode groups 11 are provided with a plurality of pairs of tabs 12 on the side close to the opening. Each electrode group 11 is provided with a positive tab and a negative tab. Since the pole column 2 is arranged on the cover body 1 and the tab 12 is installed at the second through hole 101 of the cover body 1, the tab 12 and the pole column 2 are arranged in a staggered manner, so that the installation thickness can be reduced.

[0062] In addition, the plurality of battery cells can be connected in series, in parallel, or in a combination of series and parallel connections. In this regard, the embodiments of the present invention do not impose many restrictions.

[0063] Although embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that: include: The cover body is provided with a mounting hole; The pole comprises a pole body and riveted portions and stoppers located at upper and lower ends of the pole body, the pole body being disposed in the mounting hole with a sealing ring disposed therebetween; the riveted portions and the stoppers extending outside the mounting hole and forming a mounting space with the pole body; An insulating rubber ring is sleeved outside the pole body and is arranged between the riveted portion and the cover body; an insulating plate, disposed inside the cover plate body, the insulating plate being provided with a first through hole, the sealing ring being passed through the first through hole; The riveting portion and the limiting portion clamp the insulating rubber ring, the sealing ring and a portion of the insulating plate in the installation space; A first step is formed on the outer periphery of the upper end of the pole body, and the first step serves as the riveted portion. A second step is formed on the outer periphery of the lower end of the pole body, and the second step serves as the limiting portion. The bottom surface of the riveted portion, the outer periphery of the pole body, and the top surface of the limiting portion form a mounting groove, and the mounting groove serves as the mounting space. The sealing ring is sleeved outside the pole body and is arranged between the insulating rubber ring and the limiting portion; The insulating plate is provided with a boss, and the boss is opened along the axial direction to form the first through hole. The top of the boss abuts against the cover body, and the bottom of the boss abuts against the limiting portion.

2. The battery cover assembly according to claim 1, characterized in that: A third step corresponding to the first step is formed on the upper surface of the insulating rubber ring.

3. The battery cover assembly according to claim 1, characterized in that: The pole is provided with an axial through hole, and the inner side of the cover body is further provided with a connecting piece corresponding to the pole. One end of the connecting piece is provided with a protrusion, and the side wall of the protrusion is connected to the hole wall of the axial through hole.

4. The battery cover assembly according to claim 3, characterized in that: The cover body is provided with a second through hole along the length direction. One end of the connecting piece extends to the second through hole and is suitable for connecting with the tab of the battery cell.

5. The battery cover assembly according to claim 4, characterized in that: A soldering pad is provided on the upper end of the portion of the connecting piece extending to the second through hole, and one end of the tab is bent and soldered to the soldering pad.

6. The battery cover assembly according to claim 4, characterized in that: The cover body is further provided with a sealing plate for sealing the second through hole, and the sealing plate is provided with a liquid injection hole and an explosion-proof valve at intervals.

7. A battery pack, characterized in that: include: A plurality of battery cells, each comprising a shell, one side of the shell being provided with an opening, a plurality of electrode groups disposed in the opening, and a plurality of pairs of electrode tabs corresponding one to one with the electrode groups; The battery cell cover plate assembly according to any one of claims 1 to 6, wherein the cover plate body is arranged to cover the opening of the shell.

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