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 insulating component and a second insulating component, and the end plate is provided with a 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 one side of the end plate in the thickness direction, the first protrusion is arranged on one side, opposite to the end plate, of the first plate body in a protruding mode, the first protrusion is inserted into the through hole and abuts against the hole wall of the through hole, the first insulation assembly is provided with a through hole, and the through hole penetrates through the first plate body and the first protrusion; the second insulation assembly comprises a second plate body, the second plate body is attached to the other side of the end plate in the thickness direction, the first protrusion abuts against the second plate body, the second plate body is provided with a lug hole, and the lug hole is opposite to the through hole. 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 the problem of 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 through hole along a thickness direction thereof;

[0008] A first insulating component, comprising 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 through hole and tightly abuts against the hole wall of the through hole, and the first insulating component 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, which is attached to the other side of the end plate along the thickness direction. The first protrusion is tightly pressed against the second plate body. The second plate body is provided with a pole ear hole, and the pole ear hole is opposite to the through hole.

[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 first protrusion;

[0011] And / or, an outer peripheral wall of the first protrusion is provided with an interference rib, 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, the interference ribs are provided in plurality, and the plurality of interference ribs are arranged at intervals along the circumference of the through hole;

[0013] The extension direction of the interference rib is parallel to the axial direction of the through hole, or the extension direction of the interference rib forms an angle with the axial direction of the through hole, or the interference rib extends along the axial direction of the through hole and has a corrugated structure.

[0014] As a preferred technical solution of the end cover structure, the interference rib is provided with guiding inclined surfaces at both ends along the axial direction of the through hole.

[0015] As a preferred technical solution of the end cap structure, the end plate includes a positive electrode region and a negative electrode region spaced apart, the positive electrode region is provided with at least one through hole, and the negative electrode region is provided with at least one through hole;

[0016] There are at least two first protrusions, and the at least two first protrusions correspond one-to-one to the through holes in the positive electrode region and the negative electrode region;

[0017] There are two second insulating components, and the two second plates are respectively arranged in the positive electrode area and the negative electrode area. The pole ear holes on one second plate correspond one-to-one to the through holes in the positive electrode area, and the pole ear holes on the other second plate correspond one-to-one to the through holes in the negative electrode area.

[0018] As a preferred technical solution of the end cover structure, the through hole is a rectangular hole;

[0019] 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.

[0020] 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 through hole is located in the recessed groove;

[0021] 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.

[0022] 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.

[0023] 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;

[0024] It also includes an explosion-proof valve, which closes the first pressure relief hole.

[0025] 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.

[0026] The beneficial effects of the utility model are:

[0027] 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 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 through hole and pressed against the hole wall of the 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, the second plate body is attached to the other side of the end plate along the thickness direction, the first protrusion is pressed against the second plate body, the second plate body is provided with a pole ear hole, and the pole ear hole and the through hole are opposite to each other. In a battery equipped with this end cap structure, the first protrusion abuts against the wall of the through hole, thereby achieving a sealed connection between the first protrusion and the end plate. Furthermore, the first protrusion abuts against the second plate, thereby achieving a sealed connection between the second plate and the first protrusion. Furthermore, since the first protrusion is fixed to the first plate, the first protrusion and the first plate are sealed. When the tab 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 interior of the battery and the outside world. Therefore, this end cap structure has few 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

[0028] Figure 1 The structure of the end cover structure in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0029] Figure 2 The structure of the end cover structure in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0030] Figure 3Schematic diagram of the explosion of the end cover structure in the embodiment of the utility model Figure 1 ;

[0031] Figure 4 Schematic diagram of the explosion of the end cover structure in the embodiment of the utility model Figure 2 ;

[0032] Figure 5 for Figure 4 A partial enlarged view of point A in the middle;

[0033] Figure 6 The structure of the end cover structure in the embodiment of the utility model is shown in FIG. Figure 3 ;

[0034] Figure 7 for Figure 6 Cross-sectional view at AA in the middle;

[0035] Figure 8 for Figure 6 Cross-sectional view at the middle BB.

[0036] In the picture:

[0037] Y, thickness direction;

[0038] 1. Shell; 11. End plate; 111. Through hole; 112. Sink; 113. First pressure relief hole;

[0039] 2. First insulating assembly; 21. First plate; 22. First protrusion; 221. Through hole; 222. Interference rib; 2221. Guide slope; 23. Through hole; 24. Tab guide structure; 241. First guide surface; 242. Second guide surface;

[0040] 3. Second insulating assembly; 31. Second plate; 311. Pole ear hole; 32. Flange ring;

[0041] 4. Explosion-proof valve. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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 through hole 111 along its thickness direction Y; 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 Y, 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 through hole 111 and is tightly pressed against the hole wall of the through hole 111. The first insulating component 2 is provided with a through hole 221, and the through hole 221 passes through the first plate body 21 and the first protrusion 22; the second insulating component 3 includes a second plate body 31, the second plate body 31 is attached to the other side of the end plate 11 along the thickness direction Y, the first protrusion 22 is tightly pressed against the second plate body 31, and the second plate body 31 is provided with a pole ear hole 311, and the pole ear hole 311 is opposite to the through hole 221. In a battery provided with this end cap structure, the first protrusion 22 abuts against the wall of the through hole 111, thereby achieving a sealed connection between the first protrusion 22 and the end plate 11. Furthermore, the first protrusion 22 abuts against the second plate 31, thereby achieving a sealed connection between the second plate 31 and the first protrusion 22. Furthermore, since the first protrusion 22 and the first plate 21 are fixedly connected, the first protrusion 22 and the first plate 21 are sealed. When the tab is inserted into the tab hole 311, this arrangement can, on the one hand, achieve insulation between the tab and the end plate 11 to prevent short circuits, and on the other hand, achieve isolation between the interior of the battery and the outside world. Therefore, this end cap structure eliminates the need for independent sealing components, has fewer parts, is simple to assemble, and has small assembly errors. This 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 housing 1.

[0047] Optionally, the first insulating component 2 and the second insulating component 3 are both made of elastic rubber material.

[0048] Optionally, an interference rib 222 is provided on the inner circumferential wall of the through hole 111, and the interference rib 222 abuts against the outer circumferential wall of the first protrusion 22; and / or an interference rib 222 is provided on the outer circumferential wall of the first protrusion 22, and the interference rib 222 abuts against the inner circumferential wall of the through hole 111. In this embodiment, the interference rib 222 further enhances the abutment between the first protrusion 22 and the inner circumferential wall of the through hole 111, preventing the first protrusion 22 from falling out of the through hole 111.

[0049] Optionally, multiple interference ribs 222 are provided, and the multiple interference ribs 222 are spaced apart along the circumference of the through hole 111; the extension direction of the interference ribs 222 is parallel to the axial direction of the through hole 111, or the extension direction of the interference ribs 222 forms an angle with the axial direction of the through hole 111, or the interference ribs 222 extend along the axial direction of the through hole 111 and have a corrugated structure. In this embodiment, by increasing the number of interference ribs 222, the tightness between the first protrusion 22 and the inner circumferential wall of the through hole 111 can be further improved, preventing the first protrusion 22 from dislodging from the through hole 111. Specifically, in this embodiment, the extension direction of the interference ribs 222 is parallel to the axial direction of the through hole 111.

[0050] In other embodiments, the extension direction of the interference rib 222 forms an angle with the axial direction of the through hole 111, or the interference rib 222 extends along the axial direction of the through hole 111 and has a corrugated structure. The above-mentioned setting can increase the extension length of the interference rib 222, thereby further improving the degree of tightness between the first protrusion 22 and the inner circumferential wall of the through hole 111, thereby preventing the first protrusion 22 from escaping from the through hole 111.

[0051] Optionally, the interference rib 222 is provided with guide slopes 2221 at both ends of the through hole 221 in the axial direction. In this embodiment, the guide slopes 2221 serve as guides, and this arrangement can facilitate the insertion of the first protrusion 22 into the through hole 111.

[0052] Optionally, the end plate 11 includes a positive electrode region and a negative electrode region spaced apart, the positive electrode region being provided with at least one through-hole 111, and the negative electrode region being provided with at least one through-hole 111; at least two first protrusions 22 are provided, and the at least two first protrusions 22 correspond one-to-one with the through-holes 111 in the positive electrode region and the negative electrode region; two second insulating components 3 are provided, and two second plates 31 are provided in the positive electrode region and the negative electrode region, respectively, the tab holes 311 on one second plate 31 correspond one-to-one with the through-holes 111 in the positive electrode region, and the tab holes 311 on the other second plate 31 correspond one-to-one with the through-holes 111 in the negative electrode region. In this embodiment, the above arrangement allows more tabs to pass through the tab holes 311 in the corresponding positive electrode region or the tab holes 311 in the corresponding negative electrode region, and the tabs pass through the tab holes 111 and fold over the shell 1, thereby improving the internal space utilization of the battery.

[0053] Optionally, the through-hole 221 is a rectangular hole; the first insulating assembly 2 further includes a tab guide structure 24, which is disposed on a side of the first plate 21 away from the end plate 11. The tab guide structure 24 includes a first guide surface 241 and a second guide surface 242, which are respectively disposed on opposite sides of the through-hole 221 along the width direction. The first guide surface 241, the second guide surface 242, and the first plate 21 form a trapezoidal groove. In this embodiment, the tab guide structure 24 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.

[0054] 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 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 Y 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 battery volume utilization. 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.

[0055] Optionally, the second insulating assembly 3 further includes a flange ring 32, which is disposed on the outer peripheral wall of the second plate body 31 and abuts the end plate 11. The flange ring 32 has a width b, where 0 < b ≤ 10 mm. In this embodiment, an excessively large width of the flange ring 32 can easily increase weight, material, and cost.

[0056] 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.

[0057] 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.

[0058] 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 through hole (111) along a thickness direction (Y) 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 (Y), and the first protrusion (22) is protruding from the side of the first plate (21) opposite to the end plate (11), and the first protrusion (22) is inserted into the through hole (111) and tightly abuts against the hole wall of the through hole (111), and the first insulating component (2) is provided with a through hole (221), and the through hole (221) passes through the first plate (21) and the first protrusion (22); The second insulating component (3) comprises a second plate body (31), wherein the second plate body (31) is attached to the other side of the end plate (11) along the thickness direction (Y), the first protrusion (22) is tightly pressed against the second plate body (31), and the second plate body (31) is provided with a pole ear hole (311), and the pole ear hole (311) and the through hole (221) are opposite to each other.

2. The end cap structure according to claim 1, characterized in that: The inner peripheral wall of the through hole (111) is provided with an interference rib (222), and the interference rib (222) is tightly pressed against the outer peripheral wall of the first protrusion (22); And / or, an interference rib (222) is convexly provided on the outer peripheral wall of the first protrusion (22), and the interference rib (222) is tightly pressed against the inner peripheral wall of the through hole (111).

3. The end cap structure according to claim 2, characterized in that: A plurality of interference ribs (222) are provided, and the plurality of interference ribs (222) are spaced apart along the circumference of the through hole (111); The extension direction of the interference rib (222) is parallel to the axial direction of the through hole (111), or the extension direction of the interference rib (222) forms an angle with the axial direction of the through hole (111), or the interference rib (222) extends along the axial direction of the through hole (111) and has a corrugated structure.

4. The end cap structure according to claim 2, characterized in that: The interference rib (222) is provided with guiding inclined surfaces (2221) at both ends along the axial direction of the through hole (221).

5. The end cap structure according to claim 1, characterized in that: The end plate (11) comprises a positive electrode region and a negative electrode region that are spaced apart, the positive electrode region is provided with at least one through hole (111), and the negative electrode region is provided with at least one through hole (111); At least two of the first protrusions (22) are provided, and the at least two first protrusions (22) correspond one-to-one to the through holes (111) of the positive electrode region and the negative electrode region; Two second insulating components (3) are provided, and the two second plates (31) are respectively provided in the positive electrode region and the negative electrode region. The pole ear holes (311) on one second plate (31) correspond one-to-one with the through holes (111) in the positive electrode region, and the pole ear holes (311) on the other second plate (31) correspond one-to-one with the through holes (111) in the negative electrode region.

6. The end cap structure according to claim 1, characterized in that: The through hole (221) is a rectangular hole; The first insulating component (2) further comprises a tab guide structure (24), wherein the tab guide structure (24) is arranged on a side of the first plate body (21) away from the end plate (11), and the tab guide structure (24) comprises a first guide surface (241) and a second guide surface (242), wherein the first guide surface (241) and the second guide surface (242) are respectively arranged on both sides of the through hole (221) along the width direction, and the first guide surface (241), the second guide surface (242) and the first plate body (21) are arranged to form a trapezoidal groove.

7. 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 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 (Y) is h.

8. The end cap structure according to claim 1, characterized in that: The second insulating component (3) further includes a flange ring (32), 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 (32) is b, 0<b≤10mm.

9. 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).

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).

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