Cover plate assembly and battery cell

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a cover plate assembly and a battery cell, and the cover plate assembly is characterized in that a first through hole is formed in a cover plate main body; the first insulating part is arranged on one side of the cover plate main body, and a second through hole is formed in the first insulating part; the second insulating part is arranged on the side, away from the first insulating part, of the cover plate main body, and a third through hole is formed in the second insulating part; the clamping piece penetrates through the first through hole, the second through hole and the third through hole, and the two sides of the clamping piece abut against the first insulating piece and the second insulating piece respectively. According to the utility model, displacement limitation is carried out on the first insulating part and the second insulating part through the clamping part, so that deviation between the first insulating part and the cover plate main body and between the second insulating part and the cover plate main body is prevented, and the safety of a battery cell is further improved; and through the arrangement of the first through hole, the second through hole and the third through hole, the tabs can conveniently penetrate through the through holes in sequence to be folded above the cover plate assembly, so that the space utilization rate in the battery cell shell is conveniently improved.

Description

Technical Field

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

[0002] New energy batteries are batteries made with novel materials or technologies, boasting advantages such as high energy conversion rates, long service life, and environmental friendliness. With the advancement of science and technology, coupled with the need for environmental protection, new energy batteries are finding widespread application in various fields due to their stable power supply. As one of the key technologies driving the development of new energy vehicles, energy storage systems, and portable electronic devices, they have garnered widespread attention and development in recent years.

[0003] Currently, the development of new energy sources is primarily focused on improving battery performance. However, while improving battery performance, safety is also crucial. In existing batteries, the insulation and cover plate are prone to misalignment, posing a safety hazard. Utility Model Content

[0004] In view of this, the present invention provides a cover plate assembly and a battery cell, so as to improve the battery performance while solving the problem of easy deviation between the insulating member and the cover plate body.

[0005] In the first aspect, the utility model provides a cover assembly, comprising: a cover body, which is provided with a first through hole; a first insulating member, which is arranged on one side of the cover body, and a second through hole is provided on the first insulating member, and the second through hole is connected to the first through hole; a second insulating member, which is arranged on a side of the cover body away from the first insulating member, and a third through hole is provided on the second insulating member, and the third through hole is connected to the first through hole; a clamping member, which passes through the first through hole, the second through hole and the third through hole, and one side of the clamping member abuts against the first insulating member, and the other side of the clamping member abuts against the second insulating member, so as to fasten the first insulating member and the second insulating member to the cover body.

[0006] Beneficial effects: The first insulating member and the second insulating member are limited in displacement by the clamping member to prevent the first insulating member and the second insulating member from offsetting with the cover body, thereby improving the safety of the battery cell; by setting the first through hole, the second through hole and the third through hole, it is convenient for the tabs to pass through the through holes in sequence and fold over the cover assembly, so as to improve the space utilization inside the battery cell shell.

[0007] In an optional embodiment, the clamping member includes a pressing plate, a connecting plate and a connecting flange, the pressing plate abuts against one of the first insulating member and the second insulating member, the connecting flange abuts against the other of the first insulating member and the second insulating member, and the connecting plate passes through the first through hole, the second through hole and the third through hole, and connects the pressing plate and the connecting flange.

[0008] In an optional embodiment, a plurality of the connecting pieces and a plurality of the connecting flanges are provided, and the plurality of the connecting pieces and the plurality of the connecting flanges are provided in a one-to-one correspondence.

[0009] Beneficial effect: By providing a plurality of connecting pieces and connecting flanges, the fixing effect of the clamping member on the first insulating member and the second insulating member is improved.

[0010] In an optional embodiment, the first insulating member is provided with a groove, the groove is connected to the second through hole, the pressing plate abuts against the first insulating member, and the pressing plate is embedded in the groove; or, the second insulating member is provided with a groove, the groove is connected to the third through hole, the pressing plate abuts against the second insulating member, and the pressing plate is embedded in the groove.

[0011] Beneficial effect: By providing the groove, the compression piece is fixed and restricted, thereby preventing the compression piece from moving, thereby further preventing displacement and movement between the insulating member and the cover plate body.

[0012] In an optional embodiment, the distance between the upper surface of the first insulating member and the upper surface of the cover plate body is A, which satisfies 0<A≤0.5mm.

[0013] Beneficial effect: By limiting the distance between the upper surface of the first insulating member and the upper surface of the cover plate body, the structural strength of the cover plate is ensured while improving the utilization rate of the internal space of the battery cell.

[0014] In an optional embodiment, the first insulating member includes a main body and a flange, the flange is connected to an edge of the main body, the second through hole is opened on the main body, and the main body abuts against the clamping member.

[0015] In an optional embodiment, the distance between the edge of the flange portion and the edge of the main body portion is B, and 1mm≤B≤10mm.

[0016] Beneficial effect: By limiting the distance between the edge of the flange and the edge of the main body, it is ensured that the first insulating member can be fixed to the cover body, reducing the use of materials and thereby reducing the overall weight of the cover assembly.

[0017] In an optional embodiment, the cover plate assembly further includes an explosion-proof valve, an air vent is provided on the cover plate body, and the explosion-proof valve is provided on the cover plate body corresponding to the air vent.

[0018] Beneficial effect: By setting up an explosion-proof valve, the gas inside the battery cell can be discharged to the outside, ensuring the safety of the battery cell.

[0019] In an optional embodiment, a liquid injection port is further provided on the cover plate body, and the liquid injection port is provided through the cover plate body.

[0020] Beneficial effect: By providing a liquid injection port, it is easy to inject electrolyte into the battery cell.

[0021] In a second aspect, the present invention further provides a battery cell comprising the above-mentioned cover plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 any creative work.

[0023] Figure 1 This is a schematic diagram of the exploded structure of a cover plate assembly according to an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the exploded structure of another cover plate assembly according to an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the overall structure of a cover plate assembly according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the overall structure of another cover assembly according to an embodiment of the present utility model;

[0027] Figure 5 This is a schematic top view of the cover plate assembly according to an embodiment of the present invention;

[0028] Figure 6 for Figure 5 AA cross-sectional structural diagram.

[0029] Description of reference numerals:

[0030] 10. Cover plate body; 11. First through hole; 12. Air vent; 13. Liquid filling port; 14. Embedded groove; 20. First insulating member; 21. Second through hole; 22. Main body; 23. Flange; 30. Second insulating member; 31. Third through hole; 32. Liquid passage hole; 40. Clamping member; 41. Pressing piece; 42. Connecting flange; 43. Connecting piece; 50. Groove; 60. Explosion-proof valve. DETAILED DESCRIPTION

[0031] 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.

[0032] The following combination Figures 1 to 6 , describing the embodiments of the present utility model.

[0033] According to an embodiment of the present invention, on the one hand, a cover assembly is provided, comprising a cover body 10, a first insulating member 20, a second insulating member 30, and a clamping member 40. The cover body 10 is provided with a first through hole 11; the first insulating member 20 is disposed on one side of the cover body 10, and the first insulating member 20 is provided with a second through hole 21, which is connected to the first through hole 11; the second insulating member 30 is disposed on a side of the cover body 10 away from the first insulating member 20, and the second insulating member 30 is provided with a third through hole 31, which is connected to the first through hole 11; the clamping member 40 is provided through the first through hole 11, the second through hole 21, and the third through hole 31, with one side of the clamping member 40 abutting against the first insulating member 20 and the other side of the clamping member 40 abutting against the second insulating member 30, so as to fasten the first insulating member 20 and the second insulating member 30 to the cover body 10.

[0034] When the cover plate assembly of this embodiment is applied, the displacement of the first insulating member 20 and the second insulating member 30 is restricted by the clamping member 40, so as to prevent the first insulating member 20 and the second insulating member 30 from being offset from the cover plate body 10, thereby improving the safety of the battery cell; by providing the first through hole 11, the second through hole 21 and the third through hole 31, it is convenient for the tabs to pass through the through holes in sequence and fold over the top of the cover plate assembly, so as to improve the space utilization inside the battery cell shell.

[0035] It should be noted that in related art, the tabs are electrically connected to the cover assembly via conductive sheets, which transmit electrical energy to the outside. However, the conductive sheets are located inside the cell housing, occupying space within the cell housing and reducing the space utilization within the cell housing. In this embodiment, the tabs directly pass through the first through-hole 11, the second through-hole 21, and the third through-hole 31 and are folded over the cover assembly, thereby transmitting electrical energy to the outside. This saves space within the cell housing and allows the size of the cell electrode assembly to be increased, thereby increasing the space utilization within the cell housing.

[0036] Specifically, in this embodiment, the cover plate body 10 is a plain aluminum plate.

[0037] In other alternative embodiments, the cover body 10 may also be made of other materials according to actual conditions, such as polyphenylene sulfide board.

[0038] Specifically, in this embodiment, the first insulating member 20 is made of upper plastic, and the second insulating member 30 is made of lower plastic.

[0039] In one embodiment, Figure 2 As shown, the clamping member 40 includes a pressing piece 41, a connecting piece 43 and a connecting flange 42. The pressing piece 41 abuts against one of the first insulating member 20 and the second insulating member 30, and the connecting flange 42 abuts against the other of the first insulating member 20 and the second insulating member 30. The connecting piece 43 passes through the first through hole 11, the second through hole 21 and the third through hole 31, and connects the pressing piece 41 and the connecting flange 42.

[0040] Specifically, in this embodiment, the pressing piece 41 is in contact with the first insulating member 20 , and the connecting flange 42 is in contact with the second insulating member 30 .

[0041] Of course, in other alternative embodiments, the pressing piece 41 may also be in abutment contact with the second insulating member 30 , and the connecting flange 42 may also be in contact with the first insulating member 20 .

[0042] In one embodiment, Figure 1 and Figure 2 As shown, there are a plurality of connecting pieces 43 and connecting flanges 42, and the connecting pieces 43 are arranged in a one-to-one correspondence with the connecting flanges 42. By providing a plurality of connecting pieces 43 and connecting flanges 42, the fixing effect of the clamping member 40 on the first insulating member 20 and the second insulating member 30 is improved.

[0043] Specifically, in this embodiment, each clamping member 40 is provided with two connecting pieces 43 and two connecting flanges 42 , and the two connecting pieces 43 are respectively provided at both ends of the pressing piece 41 .

[0044] Of course, in other alternative embodiments, the number of connecting pieces 43 and connecting flanges 42 can be adjusted according to actual needs, such as three, four, etc. The setting position of the connecting piece 43 can also be on the same side of the pressing piece 41, and the connecting pieces 43 on the same side can also be arranged at intervals.

[0045] In one embodiment, Figure 1 As shown, the first insulating member 20 defines a groove 50 that communicates with the second through hole 21. The compression piece 41 abuts against the first insulating member 20 and is embedded in the groove 50. The groove 50 secures the compression piece 41, preventing movement of the compression piece 41, thereby further preventing displacement between the insulating member and the cover body 10.

[0046] It should be noted that the structures on both sides of the groove 50 realize one-way limiting of the pressing piece 41 , and combined with the connecting pieces 43 respectively provided at both ends of the pressing piece 41 , realize two-way limiting of the pressing piece 41 .

[0047] In other alternative embodiments, the second insulating member 30 is provided with a groove 50 , the groove 50 is communicated with the third through hole 31 , the pressing piece 41 abuts against the second insulating member 30 , and the pressing piece 41 is embedded in the groove 50 .

[0048] In one embodiment, Figure 6 As shown, the distance A between the upper surface of the first insulating member 20 and the upper surface of the cover body 10 satisfies 0 < A ≤ 0.5 mm. By limiting the distance between the upper surface of the first insulating member 20 and the upper surface of the cover body 10, the structural strength of the cover is maintained while improving the internal space utilization of the battery cell.

[0049] Please note that Figure 6 , the upper surface of the cover body 10 is higher than the upper surface of the first insulating member 20 .

[0050] It should be noted that when A>0.5mm, the depth of the groove 50 is too deep, which causes the overall strength of the cover assembly to be reduced and does not meet the use requirements; when the upper surface of the first insulating part 20 is higher than the upper surface of the cover body 10, the overall height of the cover assembly is high, affecting the space utilization of the battery cell.

[0051] In one embodiment, Figure 5 As shown, the first insulating member 20 includes a main body 22 and a flange 23 . The flange 23 is connected to the edge of the main body 22 . The second through hole 21 is opened on the main body 22 . The main body 22 abuts against the clamping member 40 .

[0052] In one embodiment, Figure 5As shown, the distance between the edge of the flange 23 and the edge of the main body 22 is B, where 1 mm ≤ B ≤ 10 mm. This distance between the edge of the flange 23 and the edge of the main body 22 limits the distance between the edge of the flange 23 and the edge of the main body 22, ensuring that the first insulating member 20 can be fixed to the cover body 10 while reducing material usage and, therefore, the overall weight of the cover assembly.

[0053] It should be noted that the distance between the edge of the flange portion 23 and the edge of the main body portion 22 is also the width of the flange portion 23 .

[0054] It should be noted that when B is less than 1 mm, the width of the flange portion 23 is too narrow, which is not conducive to the connection and fixation of the flange portion 23 and the cover plate body 10; when B is greater than 10 mm, the width of the flange portion 23 is too wide, which increases material usage and cost, and increases the weight of the cover plate assembly, affecting the overall design of the cover plate assembly.

[0055] Please note that Figure 1 An embedding groove 14 is provided on the cover body 10, and the first insulating member 20 is arranged in the embedding groove 14. Through the flange portion 23, the first insulating member 20 can be tightly connected to the cover body 10 to ensure the integrity and stability of the entire cover assembly.

[0056] It is worth noting that the flange portion 23 also helps prevent the penetration of liquid, gas or solid particles, and protects the interior of the battery cell from interference from the external environment.

[0057] In one embodiment, Figures 1 to 3 As shown, the cover assembly further includes an explosion-proof valve 60. The cover body 10 is provided with a vent hole 12, and the explosion-proof valve 60 is provided on the cover body 10 corresponding to the vent hole 12. By providing the explosion-proof valve 60, the gas inside the battery cell can be discharged to the outside to ensure the safety of the battery cell.

[0058] In one embodiment, Figure 1 and Figure 2 As shown, the cover body 10 is further provided with a liquid injection port 13, which is provided through the cover body 10. The liquid injection port 13 is provided to facilitate injection of electrolyte into the battery cell.

[0059] For details, please refer to Figure 2 and Figure 4 The second insulating member 30 is provided with a liquid passage 32 to facilitate the transportation of the electrolyte.

[0060] According to an embodiment of the present invention, in a second aspect, a battery cell is further provided, comprising the above-mentioned cover plate assembly.

[0061] 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 present invention.

Claims

1. A cover plate assembly, characterized in that: include: The cover plate body is provided with a first through hole; a first insulating member disposed on one side of the cover body, wherein the first insulating member is provided with a second through hole, the second through hole being connected to the first through hole; a second insulating member, disposed on a side of the cover body away from the first insulating member, the second insulating member being provided with a third through hole, the third through hole being connected to the first through hole; A clamping member is provided through the first through hole, the second through hole and the third through hole, one side of the clamping member abuts against the first insulating member, and the other side of the clamping member abuts against the second insulating member to fasten the first insulating member and the second insulating member to the cover plate body.

2. The cover plate assembly according to claim 1, wherein: The clamping member includes a pressing piece, a connecting piece and a connecting flange. The pressing piece abuts against one of the first insulating member and the second insulating member, and the connecting flange abuts against the other of the first insulating member and the second insulating member. The connecting piece passes through the first through hole, the second through hole and the third through hole, and connects the pressing piece and the connecting flange.

3. The cover plate assembly according to claim 2, wherein: A plurality of the connecting pieces and the connecting flanges are provided, and the connecting pieces and the connecting flanges are provided in a one-to-one correspondence.

4. The cover plate assembly according to claim 2, wherein: The first insulating member is provided with a groove, the groove being communicated with the second through hole, the pressing piece being in contact with the first insulating member, and the pressing piece being embedded in the groove; Alternatively, the second insulating member is provided with a groove, the groove is communicated with the third through hole, the pressing piece is in contact with the second insulating member, and the pressing piece is embedded in the groove.

5. The cover plate assembly according to any one of claims 1 to 4, characterized in that: A distance between an upper surface of the first insulating member and an upper surface of the cover body is A, satisfying 0<A≤0.5 mm.

6. The cover plate assembly according to any one of claims 1 to 4, characterized in that: The first insulating member includes a main body and a flange. The flange is connected to an edge of the main body. The second through hole is formed on the main body. The main body abuts against the clamping member.

7. The cover plate assembly according to claim 6, wherein: A distance B between the edge of the flange portion and the edge of the main body portion satisfies 1 mm ≤ B ≤ 10 mm.

8. The cover plate assembly according to any one of claims 1 to 4, characterized in that: The cover plate assembly further includes an explosion-proof valve. An air vent is provided on the cover plate body. The explosion-proof valve is arranged on the cover plate body corresponding to the air vent.

9. The cover plate assembly according to any one of claims 1 to 4, characterized in that: The cover plate body is further provided with a liquid injection port, which penetrates the cover plate body.

10. A battery cell, characterized in that: A cover plate assembly comprising the cover plate assembly according to any one of claims 1 to 9.

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