End cover structure and battery

Abstract

The utility model relates to the technical field of batteries, and particularly discloses an end cover structure and a battery, the end cover structure comprises an end plate, a first insulation assembly and a second insulation assembly, and the end plate is provided with a first through hole along the thickness direction; the first insulation assembly comprises a first plate body and a first protrusion, the first plate body is attached to the side, in the thickness direction, of the end plate, the first protrusion is arranged on the side, opposite to the end plate, of the first plate body in a protruding mode, the first protrusion is inserted into the first through hole, and the first insulation assembly is provided with a through hole penetrating through the first plate body and the first protrusion. The second insulation assembly comprises a second plate body and a second protrusion, the second plate body is attached to the other side of the end plate, the second protrusion is arranged on the side, opposite to the end plate, of the second plate body in a protruding mode, the second protrusion is inserted into the through hole and abuts against the hole wall of the through hole, and the second insulation assembly is provided with a lug hole penetrating through the second plate body and the second protrusion. The end cover structure is few in parts, simple to assemble and small in assembly error, not only improves the internal and external sealing performance of the battery, but also avoids short circuit between the tabs and the battery shell.

Description

Technical Field

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

[0002] As lithium-ion battery technology matures, it's widely used as a power battery in electric vehicles and energy storage, leading to increasingly stringent requirements for performance and safety. As essential components of lithium-ion batteries, the end cap structure serves primarily to isolate the internal and external environments by welding to the aluminum shell, providing a seal. Secondly, it connects the internal and external circuits, channeling the battery's internal current through the cap terminals to the outside, acting as a current guide.

[0003] However, the existing end cap structure has a large number of parts, resulting in complex assembly processes and large assembly errors, which can easily lead to poor sealing performance inside and outside the battery and easy short circuit with the battery shell.

[0004] Therefore, an end cover structure is urgently needed to solve the above problems. Utility Model Content

[0005] The purpose of the present utility model is to provide an end cover structure and a battery to solve the problem in the related art that the existing end cover structure has a large number of parts, resulting in complicated assembly processes and large assembly errors, which easily leads to poor sealing performance inside and outside the battery and easy short circuit with the battery shell.

[0006] In one aspect, the present invention provides an end cap structure, comprising:

[0007] an end plate, wherein the end plate is provided with a first through hole along a thickness direction thereof;

[0008] A first insulating assembly includes a first plate and a first protrusion, wherein the first plate is attached to one side of the end plate along the thickness direction, the first plate is provided with a first protrusion on a side opposite to the end plate, the first protrusion is inserted into the first through hole, and the first insulating assembly is provided with a through hole, the through hole passing through the first plate and the first protrusion;

[0009] The second insulating component includes a second plate body and a second protrusion. The second plate body is attached to the other side of the end plate along the thickness direction. The second plate body is provided with a second protrusion on the side opposite to the end plate. The second protrusion is inserted into the through hole and tightly pressed against the hole wall of the through hole. The second insulating component is provided with a pole ear hole, which passes through the second plate body and the second protrusion.

[0010] As a preferred technical solution of the end cover structure, the inner peripheral wall of the through hole is provided with an interference rib, and the interference rib is tightly pressed against the outer peripheral wall of the second protrusion;

[0011] And / or, an interference rib is convexly provided on the outer peripheral wall of the second protrusion, and the interference rib is tightly pressed against the inner peripheral wall of the through hole.

[0012] As a preferred technical solution of the end cover structure, a plurality of interference ribs are provided, the plurality of interference ribs are spaced apart along the axial direction of the through hole, and the interference ribs extend around the circumference of the through hole to form an annular structure;

[0013] Alternatively, a plurality of the interference ribs are provided, the plurality of the interference ribs are spaced apart along the circumference of the through hole, and the interference ribs extend along the axial direction of the through hole.

[0014] As a preferred technical solution of the end cover structure, the interference rib extends along the axial direction of the through hole;

[0015] The interference rib is provided with guiding inclined surfaces at both ends along the axial direction of the through hole.

[0016] As a preferred technical solution of the end cover structure, the through hole is a rectangular hole;

[0017] The first insulating component also includes a tab guide structure, which is arranged on the side of the first plate away from the end plate. The tab guide structure includes a first guide surface and a second guide surface. The first guide surface and the second guide surface are respectively arranged on both sides of the through hole along the width direction. The first guide surface, the second guide surface and the first plate are arranged to form a trapezoidal groove.

[0018] As a preferred technical solution of the end cover structure, a side of the end plate provided with the second insulating component is provided with a recessed groove, and the first through hole is located in the recessed groove;

[0019] The second insulating component is disposed in the sink, the distance between the upper surface of the second insulating component and the end plate is a, -0.5h≤a≤1h, and the dimension of the end plate along the thickness direction is h.

[0020] As a preferred technical solution for the end cover structure, the second insulating component further includes a flange ring, which is arranged on the outer peripheral wall of the second plate body and abuts against the end plate. The ring width of the flange ring is b, 0<b≤10mm.

[0021] As a preferred technical solution of the end cover structure, the end plate is provided with a first pressure relief hole, and the first plate body is provided with a second pressure relief hole opposite to the first pressure relief hole;

[0022] It also includes an explosion-proof valve, which closes the first pressure relief hole.

[0023] As a preferred technical solution of the end cover structure, the end plate is provided with a first liquid injection hole, and the first plate body is provided with a second liquid injection hole opposite to the first liquid injection hole.

[0024] On the other hand, the present invention provides a battery, comprising a shell and the end cover structure of any of the above solutions, wherein one side wall of the shell is the end plate.

[0025] The beneficial effects of the utility model are:

[0026] The utility model provides an end cover structure and a battery, the end cover structure includes an end plate, a first insulating component and a second insulating component, the end plate is provided with a first through hole along its thickness direction; the first insulating component includes a first plate body and a first protrusion, the first plate body is attached to one side of the end plate along the thickness direction, the first protrusion is protruding from the side of the first plate body opposite to the end plate, the first protrusion is inserted into the first through hole, the first insulating component is provided with a through hole, the through hole passes through the first plate body and the first protrusion; the second insulating component includes a second plate body and a second protrusion, the second plate body is attached to the other side of the end plate along the thickness direction, the second plate body is protruding from the side of the second plate body opposite to the end plate, the second protrusion is inserted into the through hole and tightly abuts against the hole wall of the through hole, the second insulating component is provided with a pole ear hole, the pole ear hole passes through the second plate body and the second protrusion. In a battery provided with this end cap structure, since the first protrusion is inserted into the first through hole, and the second protrusion is inserted into the through hole of the first protrusion and abuts against the inner wall of the through hole, a sealed connection between the tab hole and the through hole is achieved. Since the second plate is fixedly connected to the second protrusion, a sealed connection between the second plate and the second protrusion can be achieved. Since the first protrusion is fixedly connected to the first plate, a sealed connection is achieved between the first protrusion and the first plate. When the tab passes through the through hole and is inserted into the tab hole, this arrangement can, on the one hand, achieve insulation between the tab and the end plate to prevent short circuits, and on the other hand, achieve isolation between the inside and outside of the battery. Therefore, this end cap structure eliminates the need for independent sealing components, has fewer parts, is simple to assemble, and has small assembly errors. It not only improves the sealing performance of the battery inside and outside, but also avoids the problem of short circuits between the tab and the battery shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The structure of the end cover structure in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0028] Figure 2 The structure of the end cover structure in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0029] Figure 3 Schematic diagram of the explosion of the end cover structure in the embodiment of the utility model Figure 1 ;

[0030] Figure 4Schematic diagram of the explosion of the end cover structure in the embodiment of the utility model Figure 2 ;

[0031] Figure 5 for Figure 4 A partial enlarged view of point A in the middle;

[0032] Figure 6 The structure of the end cover structure in the embodiment of the utility model is shown in FIG. Figure 3 ;

[0033] Figure 7 for Figure 6 Cross-sectional view at AA in the middle;

[0034] Figure 8 for Figure 6 Cross-sectional view at the middle BB.

[0035] In the picture:

[0036] X, thickness direction;

[0037] 1. Shell; 11. End plate; 111. First through hole; 112. Sink; 113. First pressure relief hole; 114. First liquid injection hole;

[0038] 2. First insulating assembly; 21. First plate; 22. First protrusion; 23. Through hole; 24. Interference rib; 241. Guide slope; 25. Tab guide structure; 251. First guide surface; 252. Second guide surface;

[0039] 3. Second insulating assembly; 31. Second plate; 32. Second protrusion; 33. Pole ear hole; 34. Flange ring;

[0040] 4. Explosion-proof valve. DETAILED DESCRIPTION

[0041] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific position, be constructed and operated in a specific position, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0043] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0044] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0045] like Figures 1 to 8As shown, this embodiment provides an end cover structure, which includes an end plate 11, a first insulating component 2 and a second insulating component 3. The end plate 11 is provided with a first through hole 111 along its thickness direction X; the first insulating component 2 includes a first plate body 21 and a first protrusion 22. The first plate body 21 is attached to one side of the end plate 11 along the thickness direction X, and the first protrusion 22 is protruding from the side of the first plate body 21 opposite to the end plate 11. The first protrusion 22 is inserted into the first through hole 111. The first insulating component 2 is provided with The through hole 23 passes through the first plate 21 and the first protrusion 22; the second insulating component 3 includes a second plate 31 and a second protrusion 32, the second plate 31 is attached to the other side of the end plate 11 along the thickness direction X, and the second protrusion 32 is protruding from the side of the second plate 31 opposite to the end plate 11. The second protrusion 32 is inserted into the through hole 23 and is tightly pressed against the hole wall of the through hole 23. The second insulating component 3 is provided with a pole ear hole 33, which passes through the second plate 31 and the second protrusion 32. In a battery equipped with this end cap structure, the first protrusion 22 is inserted into the first through hole 111, and the second protrusion 32 is inserted into the through hole 23 of the first protrusion 22 and abuts against the inner wall of the through hole 23, thereby achieving a sealed connection between the tab hole 33 and the through hole 23. Furthermore, since the second plate 31 is fixedly connected to the second protrusion 32, a sealed connection between the second plate 31 and the second protrusion 32 can be achieved. Furthermore, since the first protrusion 22 is fixedly connected to the first plate 21, a sealed connection between the first protrusion 22 and the first plate 21 is achieved. When the tab passes through the through hole 23 and is inserted into the tab hole 33, this arrangement can not only achieve insulation between the tab and the end plate 11 to prevent short circuits, but also isolate the battery interior from the outside world. Therefore, this end cap structure eliminates the need for independent sealing components, has fewer parts, is simple to assemble, and has a small assembly error. This not only improves the internal and external sealing performance of the battery, but also avoids the problem of short circuits between the tab and the battery housing 1.

[0046] Optionally, an interference rib 24 is provided on the inner circumferential wall of the through hole 23, and the interference rib 24 abuts against the outer circumferential wall of the second protrusion 32; and / or an interference rib 24 is provided on the outer circumferential wall of the second protrusion 32, and the interference rib 24 abuts against the inner circumferential wall of the through hole 23. In this embodiment, the interference rib 24 further enhances the abutment between the inner circumferential wall of the through hole 23 and the outer circumferential wall of the tab hole 33, thereby preventing the first protrusion 22 and the second protrusion 32 from separating from each other.

[0047] Optionally, a plurality of interference ribs 24 are provided, and the plurality of interference ribs 24 are spaced apart along the circumference of the through hole 23, and the interference ribs 24 extend along the axial direction of the through hole 23. In this embodiment, by increasing the number of interference ribs 24, the tightness between the outer circumferential wall of the second protrusion 32 and the inner circumferential wall of the first protrusion 22 can be further improved, thereby preventing the first protrusion 22 from falling out of the through hole.

[0048] In other embodiments, a plurality of interference ribs 24 are provided, and the plurality of interference ribs 24 are spaced apart along the axial direction of the through hole 23, and the interference ribs 24 extend circumferentially around the through hole 23 to form an annular structure. This arrangement can not only improve the tightness between the outer circumferential wall of the second protrusion 32 and the inner circumferential wall of the first protrusion 22, but also enhance the sealing performance of the through hole 23 and the tab hole 33.

[0049] Optionally, the interference rib 24 extends along the axial direction of the through hole 23; guide slopes 241 are provided at both ends of the interference rib 24 along the axial direction of the through hole 23. In this embodiment, the guide slopes 241 serve as guides, and this arrangement can facilitate the insertion of the second protrusion 32 into the through hole 23.

[0050] Optionally, the through-hole 23 is a rectangular hole; the first insulating assembly 2 further includes a tab guide structure 25, which is disposed on a side of the first plate 21 away from the end plate 11. The tab guide structure 25 includes a first guide surface 251 and a second guide surface 252, which are respectively disposed on opposite sides of the through-hole 23 along the width direction. The first guide surface 251, the second guide surface 252, and the first plate 21 form a trapezoidal groove. In this embodiment, the tab guide structure 25 can improve the shape of the tab after it is folded, protect the tab, and prevent the tab from short-circuiting with the housing 1 due to poor folded shape of the tab.

[0051] Optionally, a recessed groove 112 is formed on one side of the end plate 11 where the second insulating assembly 3 is disposed, and the first through-hole 111 is located within the recessed groove 112. The second insulating assembly 3 is disposed within the recessed groove 112, and the distance between the upper surface of the second insulating assembly 3 and the end plate 11 is a, where -0.5h ≤ a ≤ 1h, and the dimension of the end plate 11 along the thickness direction X is h. In this embodiment, if the upper surface of the second insulating assembly 3 extends too far beyond the surface of the end plate 11, this is not conducive to improving the volume utilization of the battery. If the upper surface of the second insulating assembly 3 extends too far beyond the surface of the end plate 11, this results in low strength of the end plate 11, which is not conducive to battery safety.

[0052] Optionally, the second insulating assembly 3 further includes a flange ring 34, which is disposed on the outer peripheral wall of the second plate body 31 and abuts the end plate 11. The flange ring 34 has a width b, where 0 < b ≤ 10 mm. In this embodiment, an excessively large width of the flange ring 34 can easily increase weight, material, and cost.

[0053] Optionally, the end plate 11 is provided with a first pressure relief hole 113, and the first plate body 21 is provided with a second pressure relief hole opposite to the first pressure relief hole 113. The end cap structure further includes an explosion-proof valve 4, which seals the first pressure relief hole 113. In this embodiment, the function of the explosion-proof valve 4 is to prevent thermal runaway accidents and avoid imbalance of pressure inside and outside the battery pack. At the same time, considering that a lithium battery will instantly generate a large amount of toxic gas when it catches fire, timely and targeted pressure relief and discharge of the gas is required.

[0054] Optionally, the end plate 11 is provided with a first injection hole 114, and the first plate body 21 is provided with a second injection hole opposite to the first injection hole 114. In this embodiment, the electrolyte is injected into the battery through the first injection hole 114 and the second injection hole. After the injection is completed, considering the sealing performance to ensure that the electrolyte does not leak out, the injection holes are usually sealed using methods such as laser welding to ensure their sealing.

[0055] This embodiment further provides a battery, comprising a housing 1 and the end cover structure of the above solution, wherein one side wall of the housing 1 is the end plate 11. This arrangement can further enhance the strength of the housing 1, thereby enhancing the stability of the battery.

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. End cap structure, characterized in that, include: an end plate (11), wherein the end plate (11) is provided with a first through hole (111) along a thickness direction (X) thereof; A first insulating component (2) comprises a first plate (21) and a first protrusion (22), wherein the first plate (21) is attached to one side of the end plate (11) along the thickness direction (X), the first protrusion (22) is protruding from the side of the first plate (21) opposite to the end plate (11), the first protrusion (22) is inserted into the first through hole (111), and the first insulating component (2) is provided with a through hole (23), wherein the through hole (23) passes through the first plate (21) and the first protrusion (22); The second insulating component (3) comprises a second plate body (31) and a second protrusion (32), wherein the second plate body (31) is attached to the other side of the end plate (11) along the thickness direction (X), and the second protrusion (32) is protruding from the side of the second plate body (31) opposite to the end plate (11), and the second protrusion (32) is inserted into the through hole (23) and tightly abuts against the hole wall of the through hole (23), and the second insulating component (3) is provided with a pole ear hole (33), and the pole ear hole (33) passes through the second plate body (31) and the second protrusion (32).

2. The end cap structure according to claim 1, characterized in that: An interference rib (24) is convexly provided on the inner peripheral wall of the through hole (23), and the interference rib (24) is tightly pressed against the outer peripheral wall of the second protrusion (32); And / or, an interference rib (24) is convexly provided on the outer peripheral wall of the second protrusion (32), and the interference rib (24) is tightly pressed against the inner peripheral wall of the through hole (23).

3. The end cap structure according to claim 2, characterized in that: The interference ribs (24) are provided in plurality, and the plurality of interference ribs (24) are arranged at intervals along the axial direction of the through hole (23), and the interference ribs (24) extend circumferentially around the through hole (23) to form an annular structure; Alternatively, a plurality of the interference ribs (24) are provided, and the plurality of the interference ribs (24) are arranged at intervals along the circumference of the through hole (23), and the interference ribs (24) extend along the axial direction of the through hole (23).

4. The end cap structure according to claim 2, characterized in that: The interference rib (24) extends along the axial direction of the through hole (23); The interference rib (24) is provided with guide inclined surfaces (241) at both ends along the axial direction of the through hole (23).

5. The end cap structure according to claim 1, characterized in that: The through hole (23) is a rectangular hole; The first insulating component (2) further comprises a tab guide structure (25), wherein the tab guide structure (25) is arranged on a side of the first plate body (21) away from the end plate (11), and the tab guide structure (25) comprises a first guide surface (251) and a second guide surface (252), wherein the first guide surface (251) and the second guide surface (252) are respectively arranged on both sides of the through hole (23) along the width direction, and the first guide surface (251), the second guide surface (252) and the first plate body (21) are arranged to form a trapezoidal groove.

6. The end cap structure according to claim 1, characterized in that: A recessed groove (112) is provided on one side of the end plate (11) on which the second insulating component (3) is provided, and the first through hole (111) is located in the recessed groove (112); The second insulating component (3) is arranged in the sink (112), the distance between the upper surface of the second insulating component (3) and the end plate (11) is a, -0.5h≤a≤1h, and the dimension of the end plate (11) along the thickness direction (X) is h.

7. The end cap structure according to claim 1, characterized in that: The second insulating component (3) further includes a flange ring (34), which is arranged on the outer peripheral wall of the second plate body (31) and abuts against the end plate (11), and the ring width of the flange ring (34) is b, 0<b≤10mm.

8. The end cap structure according to claim 1, characterized in that: The end plate (11) is provided with a first pressure relief hole (113), and the first plate body (21) is provided with a second pressure relief hole opposite to the first pressure relief hole (113); It also includes an explosion-proof valve (4), which closes the first pressure relief hole (113).

9. The end cap structure according to claim 1, characterized in that: The end plate (11) is provided with a first liquid injection hole (114), and the first plate body (21) is provided with a second liquid injection hole opposite to the first liquid injection hole (114).

10. A battery, characterized in that It comprises a shell (1) and the end cover structure according to any one of claims 1 to 9, wherein one side wall of the shell (1) is the end plate (11).

Images