Cover plate structure, battery shell and battery cell

Abstract

The utility model relates to the technical field of energy batteries, and discloses a cover plate structure, a battery shell and a battery cell, the cover plate structure comprises a cover plate body, a pole, a riveting block, an insulation protection layer and an abutting part, the cover plate body is provided with a mounting hole, the pole is mounted in the mounting hole, the riveting block is connected with the pole, the insulation protection layer wraps the periphery of the riveting block, and the abutting part is connected with the riveting block. The abutting part is arranged between the insulation protection layer and the riveting block in an abutting mode. The periphery of the riveting block is coated with the insulating protection layer, so that the riveting block is protected, short circuit caused by lap joint of residual metal filings on the periphery of the riveting block or metal filings generated when an external structure rubs the riveting block and the cover plate body is avoided, the use safety of the battery is ensured, and the abutting part is arranged between the insulating protection layer and the riveting block, so that the service life of the battery is prolonged, and the service life of the battery is prolonged. The assembling pre-tightening force between the insulation protection layer and the riveting block can be enhanced, and the risks of displacement and loosening of the insulation protection layer and the riveting block are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy batteries, and in particular to a cover plate structure, a battery shell and a battery core. Background Art

[0002] The rivet block is an important part of the battery cell structure. The welding of the rivet block and the busbar can achieve the connection and conduction between the battery cells, and the laser welding of the rivet block and the pole can achieve the conduction between the inside and outside of the battery cell. In the prior art, the rivet block adopts the stamping and machining process, and there is a risk of metal chips on the edge of the broken material. After the rivet block is assembled to the cover plate, the metal chips are easy to cause a short circuit on the upper surface of the cover plate.

[0003] Although the existing chip removal process has been improved (such as vibration polishing process, cleaning process, etc.), there is still a risk of residual chips in the riveted block itself, or the side of the riveted block is contaminated by external metal chips or scratched by external structures to produce metal chips, which will cause the upper surface of the cover to overlap and short-circuit, causing battery corrosion, spontaneous combustion and other failures. Utility Model Content

[0004] In view of this, the utility model provides a cover plate structure, a battery shell and a battery cell to solve the problem that metal chips are generated on the outside of the existing riveted block and short-circuited with the cover plate, causing battery corrosion, spontaneous combustion and other faults.

[0005] The first aspect of the utility model provides a cover plate structure, including a cover plate body, a pole, a rivet block, an insulating protective layer and an abutment portion, the cover plate body is provided with a mounting hole, the pole is mounted in the mounting hole, the rivet block is connected to the pole, the insulating protective layer is coated on the outer periphery of the rivet block, and the abutment portion is pressed and arranged between the insulating protective layer and the rivet block.

[0006] Beneficial effect: An insulating protective layer is provided to cover the periphery of the riveted block to protect the riveted block, thereby preventing metal chips remaining on the periphery of the riveted block or metal chips generated by scratching the riveted block by the external structure and overlapping the cover plate body to cause a short circuit, thereby ensuring the safety of battery use. The abutment portion is provided between the insulating protective layer and the riveted block, which can enhance the assembly preload force between the insulating protective layer and the riveted block and reduce the risk of displacement and loosening of the two.

[0007] In some embodiments, the abutting portion is connected to an inner wall of the insulating protection layer or an outer wall of the rivet block.

[0008] Beneficial effect: The abutting portion can be connected to the inner wall of the insulating protective layer or the outer wall of the riveting block, that is, the abutting portion can be processed and formed together with the insulating protective layer or the riveting block, thereby simplifying the processing steps.

[0009] In some embodiments, the abutting portion is a convex rib, which is arranged at intervals along the circumferential direction of the inner wall of the insulating protection layer.

[0010] Beneficial effect: The convex ribs arranged at intervals along the inner wall of the insulating protective layer can abut the insulating protective layer and the riveting block on all sides, thereby enhancing the circumferential preload between the two and ensuring the stability of the structural assembly.

[0011] In some embodiments, the top surface of the insulating protection layer is arranged not lower than the top surface of the riveting block.

[0012] Beneficial effect: the top surface of the riveting block does not protrude from the top surface of the insulating protective layer, that is, the insulating protective layer can completely cover the riveting block, thereby enhancing the protective effect.

[0013] In some embodiments, the thickness T of the insulating protection layer is greater than 0.2 mm, and the height H of the insulating protection layer is greater than or equal to 3T.

[0014] Beneficial effect: By setting the thickness of the insulating protective layer within a suitable range and limiting the height range of the insulating protective layer, the protective effect of the insulating protective layer is optimized, and waste caused by setting the size too large and increasing the deadweight of the structure are avoided.

[0015] In some embodiments, the insulating protective layer includes a connected vertical portion and a horizontal portion, the vertical portion is wrapped around the outer periphery of the rivet block, the abutting portion is pressed between the vertical portion and the rivet block, an installation step is provided on the outer periphery of the rivet block, and the horizontal portion overlaps the installation step.

[0016] Beneficial effect: The vertical portion is covered on the outer periphery of the riveted block, and the abutting portion is pressed between the vertical portion and the riveted block to enhance the covering force of the vertical portion on the riveted block, thereby protecting the riveted block; the horizontal portion is overlapped on the installation step on the outer periphery of the riveted block, and the installation step limits the installation of the horizontal portion, thereby reducing the risk of displacement and loosening of the insulating protective layer and the riveted block, and enhancing the assembly stability between the two.

[0017] In some embodiments, the cover structure further includes an upper plastic, wherein the upper plastic is disposed between the riveting block and the cover body, and a top of the upper plastic abuts against the horizontal portion.

[0018] Beneficial effect: The upper plastic is used to separate the riveted block and the cover body to avoid conductive contact between the bottom surface of the riveted block and the cover body. The top and horizontal parts of the upper plastic are in contact, and the two cooperate to achieve complete covering of the periphery of the riveted block.

[0019] In some embodiments, the insulating protective layer and the riveting block are injection molded or overmolded.

[0020] Beneficial effects: The insulating protective layer and the riveted block are fastened together by injection molding or encapsulation, which has little impact on the process and can be produced automatically, simplifies the assembly process, and improves product processing accuracy.

[0021] The second aspect of the utility model further provides a battery casing, comprising a shell and a cover plate structure of the utility model, the shell is provided with an opening, the cover plate structure is located in the opening and connected with the shell to form an installation cavity.

[0022] The battery casing of the utility model includes the cover plate structure of the utility model, and therefore has the same technical effect as the cover plate structure of the utility model. The riveted block is protected by the provided insulating protective layer, thereby avoiding the metal chips on the periphery of the riveted block and the cover plate body from overlapping and conducting, thereby avoiding the short circuit of the shell conduction, thereby improving the safety of the battery casing.

[0023] The third aspect of the utility model further provides a battery core, comprising a pole group and a battery shell of the utility model, wherein the pole group is arranged in the installation cavity of the battery shell, and the pole group is electrically connected to the pole column of the battery shell.

[0024] The battery cell of the utility model includes the battery shell of the utility model, and therefore has the same technical effect as the battery shell of the utility model. The rivet block is protected by the provided insulating protective layer, thereby preventing metal chips on the periphery of the rivet block and the battery shell from overlapping and conducting electricity and causing a short circuit, thereby preventing the battery from being corroded, spontaneously combusted and other faults caused by the short circuit, and improving the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a three-dimensional structural schematic diagram of the cover plate structure of an embodiment of the utility model;

[0027] Figure 2 This is an exploded schematic diagram of the cover plate structure of an embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the insulating protective layer of an embodiment of the utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the insulating protective layer and the riveting block in the embodiment of the utility model;

[0030] Figure 5 A top view of the cover plate structure of an embodiment of the utility model;

[0031] Figure 6 for Figure 5 Sectional view of AA in the middle;

[0032] Figure 7 for Figure 6 Schematic diagram of the enlarged structure at point B in the middle.

[0033] Description of reference numerals:

[0034] 1. Cover plate body; 11. Mounting hole; 2. Pole; 3. Riveting block; 31. Through hole; 32. Mounting step; 4. Insulation protection layer; 41. Vertical part; 42. Horizontal part; 43. Connecting part; 5. Abutting part; 6. Upper plastic. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0036] like Figures 1 to 7 As shown, according to an embodiment of the utility model, on the one hand, a cover plate structure is provided, including a cover plate body 1, a pole 2, a rivet block 3, an insulating protective layer 4 and an abutment portion 5, wherein the cover plate body 1 is provided with a mounting hole 11, the pole 2 is mounted in the mounting hole 11, the rivet block 3 is connected to the pole 2, the insulating protective layer 4 is covered on the outer periphery of the rivet block 3, and the abutment portion 5 is pressed and arranged between the insulating protective layer 4 and the rivet block 3.

[0037] The cover plate structure of the present embodiment is provided with an insulating protective layer 4 covering the outer periphery of the riveted block 3 to protect the riveted block 3, thereby preventing metal chips remaining on the outer periphery of the riveted block 3 or metal chips generated by scratching the riveted block 3 by the external structure from overlapping with the cover plate body 1 and causing a short circuit, thereby ensuring the safety of battery use. The abutment portion 5 is provided between the insulating protective layer 4 and the riveted block 3, which can enhance the assembly pre-tightening force between the insulating protective layer 4 and the riveted block 3 and reduce the risk of displacement and loosening of the two.

[0038] In this embodiment, the cover body 1 may be a rectangular cover, and the mounting hole 11 may be a circular hole.

[0039] The pole 2 is used to draw the current inside the battery cell to the outside. The pole 2 generally includes a positive pole 2 and a negative pole 2. The positive pole 2 is used to draw the positive current of the battery cell, and the negative pole 2 is used to draw the negative current of the battery cell. Since the structure of the pole 2 is prior art, it will not be repeated here.

[0040] The pole 2 is installed in the mounting hole 11 and insulated and sealed by a seal to ensure insulation and sealing between the pole 2 and the cover body 1. The portion of the pole 2 extending out of the mounting hole 11 is located outside the cover body 1 and is used to connect with the riveting block 3.

[0041] The riveting block 3 is provided with a through hole 31, which is correspondingly connected to the mounting hole 11, and the pole 2 passes through the mounting hole 11 and is assembled into the through hole 31. The riveting block 3 and the pole 2 are laser welded to conduct electricity as a whole, thereby realizing the conduction between the inside and outside of the battery cell.

[0042] In terms of shape, the riveting block 3 may be a rectangular block, and mounting steps 32 are arranged around the outer wall thereof, and the mounting steps 32 extend horizontally toward the through hole 31 .

[0043] Optionally, the abutment portion 5 can be connected to the inner wall of the insulating protective layer 4 and processed and formed together with the insulating protective layer 4 to simplify the processing steps. During installation, the insulating protective layer 4 is covered on the outer periphery of the riveting block 3, and the abutment portion 5 is subjected to force to abut the outer wall of the riveting block 3.

[0044] Of course, in some embodiments, the abutment portion 5 can also be connected to the outer wall of the riveting block 3 and formed together with the riveting block 3. During installation, the insulating protective layer 4 covers the outer periphery of the riveting block 3 and abuts against the abutment portion 5 under force.

[0045] In terms of specific form, the abutment portion 5 can be a convex rib, which is arranged at intervals along the inner wall of the insulating protective layer 4. The convex ribs arranged at intervals along the inner wall of the insulating protective layer 4 can abut the insulating protective layer 4 and the riveting block 3 on all sides, thereby enhancing the circumferential preload between the two and ensuring the stability of the structural assembly.

[0046] Specifically, a plurality of convex ribs are provided and are arranged at equal intervals along the circumferential direction of the inner wall of the insulating protective layer 4 , so that the forces around the insulating protective layer 4 and the riveting block 3 are balanced, and the structural stability is better.

[0047] In this embodiment, the convex ribs extend along the height direction of the insulating protective layer 4 to form vertical convex ribs.

[0048] In this embodiment, in order to enhance the protective effect of the riveted block 3, the size of the insulating protective layer 4 is also designed. The top surface of the insulating protective layer 4 is not lower than the top surface of the riveted block 3, so that the top surface of the riveted block 3 does not protrude from the top surface of the insulating protective layer 4, that is, the insulating protective layer 4 can be completely covered on the riveted block 3 to enhance the protective effect.

[0049] Furthermore, the thickness T of the insulating protective layer 4 is greater than 0.2 mm, and the height H of the insulating protective layer 4 is greater than or equal to 3 T. By setting the thickness of the insulating protective layer 4 within a suitable range and limiting the height range of the insulating protective layer 4, the protective effect of the insulating protective layer 4 is optimized, and waste caused by setting the size too large and increasing the deadweight of the structure are avoided.

[0050] Exemplarily, the thickness T of the insulating protection layer 4 may be 0.3 mm, 0.4 mm or 0.5 mm, etc., and correspondingly, the height H of the insulating protection layer 4 may be greater than or equal to 0.9 mm, 1.2 mm or 1.5 mm, etc., which is not specifically limited in this embodiment.

[0051] In terms of specific structure, the insulating protective layer 4 includes a connected vertical portion 41 and a horizontal portion 42, wherein the vertical portion 41 is wrapped around the outer periphery of the riveting block 3, the abutting portion 5 is pressed between the vertical portion 41 and the riveting block 3, the outer periphery of the riveting block 3 is provided with an installation step 32, and the horizontal portion 42 is overlapped on the installation step 32.

[0052] The vertical portion 41 is covered on the outer periphery of the riveted block 3, and the abutting portion 5 is pressed between the vertical portion 41 and the riveted block 3 to enhance the covering force of the vertical portion 41 on the riveted block 3, thereby protecting the riveted block 3. The horizontal portion 42 is overlapped on the installation step 32 on the outer periphery of the riveted block 3. The installation step 32 limits the installation of the horizontal portion 42, thereby reducing the risk of displacement and loosening of the insulating protective layer 4 and the riveted block 3, and enhancing the assembly stability between the two.

[0053] Specifically, the insulating protective layer 4 is rectangular, with a connecting portion 43 in the middle, the riveting block 3 is installed in the connecting portion 43, the vertical portion 41 and the horizontal portion 42 are vertically arranged, and the horizontal portion 42 extends toward the center of the connecting portion 43, that is, the inner diameter of the horizontal portion 42 is smaller than the inner diameter of the vertical portion 41.

[0054] As for the specific material, the insulating protective layer 4 is made of insulating material, and there is no situation where the falling particles overlap and conduct electricity with the cover body 1. The insulating protective layer 4 can be made of, but is not limited to, plastic, resin and other materials.

[0055] In some embodiments, the insulating protective layer 4 and the riveted block 3 are injection molded or overmolded. The insulating protective layer 4 and the riveted block 3 are fastened and connected together by injection molding or overmolding, which has little impact on the process and can be automatically produced, simplifies the assembly process, and improves the product processing accuracy.

[0056] In addition to the above configuration, the cover structure further includes an upper plastic 6, which is disposed between the riveting block 3 and the cover body 1, and the top of the upper plastic 6 abuts against the horizontal portion 42. The upper plastic 6 is used to separate the riveting block 3 and the cover body 1 to prevent the bottom surface of the riveting block 3 and the cover body 1 from contacting and conducting electricity, and the top of the upper plastic 6 abuts against the horizontal portion 42, and the two cooperate to achieve complete covering of the outer periphery of the riveting block 3.

[0057] The shape of the upper plastic 6 matches that of the riveting block 3 . The upper plastic 6 is rectangular and is provided with an escape hole for the pole 2 to pass through.

[0058] To facilitate understanding of the cover plate structure of this embodiment, the installation process is described as follows in conjunction with the accompanying drawings of the specification:

[0059] The insulating protective layer 4 and the riveting block 3 are closely matched by injection molding and rubber coating, and the abutment portion 5 is used to enhance the matching strength between the vertical portion 41 of the insulating protective layer 4 and the riveting block 3, and the horizontal portion 42 of the insulating protective layer 4 overlaps the installation step 32;

[0060] The pole 2 is inserted into the mounting hole 11 of the cover body 1, the upper plastic 6 is arranged on the top surface of the cover body 1 and sleeved on the outer periphery of the pole 2, the rivet block 3 and the insulating protective layer 4 are integrally sleeved on the outer periphery of the pole 2, the bottom surface of the rivet block 3 abuts against the upper plastic 6, and the top of the upper plastic 6 abuts against the horizontal portion 42 of the insulating protective layer 4.

[0061] According to an embodiment of the utility model, on the other hand, a battery casing is further provided, comprising a shell and a cover structure of this embodiment, wherein the shell is provided with an opening, and the cover structure is located in the opening and connected to the shell to form an installation cavity.

[0062] The battery casing of the present embodiment includes the cover plate structure of the present embodiment, and therefore has the same technical effect as the cover plate structure of the present embodiment. The rivet block 3 is protected by the provided insulating protective layer 4, thereby preventing metal chips on the periphery of the rivet block 3 from overlapping and conducting with the cover plate body 1, thereby preventing the shell from short-circuiting and improving the safety of the battery casing.

[0063] Specifically, the shell may be a square shell or a round shell to accommodate battery cells of different shapes.

[0064] According to an embodiment of the utility model, on another aspect, a battery cell is provided, comprising a pole group and a battery casing of this embodiment, wherein the pole group is arranged in a mounting cavity of the battery casing, and the pole group is electrically connected to a pole 2 of the battery casing.

[0065] The battery cell of this embodiment includes the battery casing of this embodiment, and therefore has the same technical effect as the battery casing of this embodiment. The rivet block 3 is protected by the insulating protective layer 4 provided, thereby preventing metal chips on the periphery of the rivet block 3 from overlapping and conducting with the battery casing to cause a short circuit, thereby preventing the short circuit from causing corrosion, spontaneous combustion and other faults of the battery, thereby improving the safety of battery use.

[0066] Specifically, the pole group can be a square pole group or a circular pole group. The square pole group is assembled in a square shell to form a square battery cell, and the circular pole group is assembled in a circular shell to form a circular battery cell.

[0067] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cover plate structure, characterized in that: include: The cover plate body is provided with a mounting hole; A pole, installed in the installation hole; A riveting block connected to the pole; An insulating protective layer, covering the outer periphery of the riveting block; The abutting portion is arranged between the insulating protection layer and the riveting block for pressing.

2. The cover plate structure according to claim 1, characterized in that: The abutting portion is connected to the inner wall of the insulating protection layer or the outer wall of the rivet block.

3. The cover plate structure according to claim 2, characterized in that: The abutting portions are convex ribs, which are arranged at intervals along the inner wall of the insulating protection layer in the circumferential direction.

4. The cover plate structure according to any one of claims 1 to 3, characterized in that: The top surface of the insulating protection layer is arranged not lower than the top surface of the riveting block.

5. The cover plate structure according to claim 4, characterized in that: The thickness T of the insulating protection layer is greater than 0.2 mm, and the height H of the insulating protection layer is greater than or equal to 3T.

6. The cover plate structure according to any one of claims 1 to 3, characterized in that: The insulating protective layer includes a connected vertical portion and a horizontal portion, the vertical portion is covered on the outer periphery of the riveted block, the abutting portion is pressed and arranged between the vertical portion and the riveted block, the outer periphery of the riveted block is provided with an installation step, and the horizontal portion overlaps the installation step.

7. The cover plate structure according to claim 6, characterized in that: The cover plate structure further includes an upper plastic, which is arranged between the riveting block and the cover plate body, and the top of the upper plastic is in contact with the horizontal portion.

8. The cover plate structure according to any one of claims 1 to 3, characterized in that: The insulating protective layer and the riveting block are injection molded or overmolded.

9. A battery casing, characterized in that: include: a housing having an opening; The cover plate structure according to any one of claims 1 to 8 is located in the opening and connected to the shell to form a mounting cavity.

10. A battery cell, characterized in that: include: Pole group; The battery casing of claim 9, wherein the electrode group is disposed in a mounting cavity of the battery casing, and the electrode group is electrically connected to a pole of the battery casing.

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