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 lower insulating part, an upper insulating part and a clamping assembly, and the end plate is provided with a first through hole along the thickness direction; the lower insulating part is attached to one side of the end plate in the thickness direction, and a second through hole is formed in the lower insulating part; the upper insulating part is attached to the other side of the end plate, the lower insulating part is provided with a third through hole, and the first through hole, the second through hole and the third through hole are sequentially communicated to form a lug hole; the clamping assembly comprises a clamping piece with a U-shaped groove, the clamping piece is inserted into the lug hole, and the upper insulating piece and the end plate are inserted into the U-shaped groove in the direction perpendicular to the thickness direction; or the upper insulating part, the end plate and the lower insulating part are inserted into the U-shaped groove along the direction perpendicular to the thickness direction; or the end plate and the lower insulating part are inserted into the U-shaped groove along the direction perpendicular to the thickness direction. According to the arrangement, the upper insulating part and / or the lower insulating part are / is independently fixed with the end plate, so that the fixing failure of the upper insulating part and / or the lower insulating part on the end plate can be avoided.

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, traditional end cap structures typically consist of a plain aluminum sheet, (positive and negative) poles, (positive and negative) upper and lower insulators, explosion-proof valves, and explosion-proof valve protective films. During assembly, the upper insulator, plain aluminum sheet, lower insulator, and sealing ring are sandwiched between the pole base plate and the connection block. After clamping, the pole top and connection block are secured by riveting or laser welding.

[0004] The upper end of the pole is fixed to the connecting block by riveting or laser welding to fix the upper and lower insulating parts to the end plate. The deformation of other components such as the seal at a later stage can easily lead to failure of the fixation of the upper and lower insulating parts on the end plate.

[0005] Therefore, an end cover structure is urgently needed to solve the above problems. Utility Model Content

[0006] 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 upper end of the pole and the connecting block are fixed by riveting or laser welding to fix the upper and lower insulating members to the end plate, and the subsequent deformation of other components such as the seal can easily lead to the failure of the fixation of the upper and lower insulating members on the end plate.

[0007] In one aspect, the present invention provides an end cap structure, comprising:

[0008] an end plate, wherein the end plate is provided with a first through hole along a thickness direction thereof;

[0009] a lower insulating member, attached to one side of the end plate along the thickness direction, the lower insulating member being provided with a second through hole;

[0010] an upper insulating member attached to the other side of the end plate along the thickness direction, the lower insulating member is provided with a third through hole, the first through hole, the second through hole and the third through hole are sequentially connected to form a pole ear hole;

[0011] The clamping assembly includes a clamping member, which is provided with a U-shaped groove. The clamping member is inserted into the pole ear hole, and the upper insulating member and the end plate are both inserted into the U-shaped groove perpendicular to the thickness direction; or, the upper insulating member, the end plate and the lower insulating member are all inserted into the U-shaped groove perpendicular to the thickness direction; or, the end plate and the lower insulating member are both inserted into the U-shaped groove perpendicular to the thickness direction.

[0012] As a preferred technical solution of the end cover structure, two pole lug holes are provided, and two clamping members are provided, and the two clamping members are arranged in the two pole lug holes in a one-to-one correspondence.

[0013] As a preferred technical solution of the end cover structure, the clamping assembly further includes a connecting plate, and the two clamping members are fixedly arranged on the connecting plate at intervals.

[0014] As a preferred technical solution for the end cover structure, the clamping assembly is an integrally formed part.

[0015] As a preferred technical solution for the end cap structure, the tab hole is a rectangular hole;

[0016] A tab guide structure is provided on the side of the lower insulating member away from the end plate, and 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 provided on both sides of the tab hole along the width direction, and the first guide surface, the second guide surface and the lower insulating member are arranged to form a trapezoidal groove.

[0017] As a preferred technical solution of the end cover structure, a side of the end plate provided with the upper insulating member is provided with a recessed groove, and the pole ear hole is located in the recessed groove;

[0018] The upper insulating member is disposed in the sink, the distance between the upper surface of the upper insulating member and the end plate is a, -0.5h≤a≤1h, and the dimension of the end plate along the thickness direction is h.

[0019] As a preferred technical solution for the end cover structure, a flange ring is protruded from the outer peripheral wall of the upper insulating member, and the flange ring abuts against the end plate. The ring width of the flange ring is b, 0<b≤10mm.

[0020] As a preferred technical solution of the end cover structure, the end plate is provided with a first pressure relief hole, and the lower insulating member is provided with a second pressure relief hole opposite to the first pressure relief hole;

[0021] It also includes an explosion-proof valve, which closes the first pressure relief hole.

[0022] As a preferred technical solution of the end cover structure, the end plate is provided with a first liquid injection hole, and the lower insulating member is provided with a second liquid injection hole opposite to the first liquid injection hole.

[0023] 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.

[0024] The beneficial effects of the utility model are:

[0025] The utility model provides an end cover structure and a battery, which includes an end plate, a lower insulating member, an upper insulating member and a clamping assembly, wherein the end plate is provided with a first through hole along its thickness direction; the lower insulating member is attached to one side of the end plate along the thickness direction, and the lower insulating member is provided with a second through hole; the upper insulating member is attached to the other side of the end plate along the thickness direction, and the lower insulating member is provided with a third through hole, the first through hole, the second through hole and the third through hole are connected in sequence to form a pole ear hole; the clamping assembly includes a clamping member, the clamping member is provided with a U-shaped groove, the clamping member is inserted into the pole ear hole, the upper insulating member and the end plate are both inserted into the U-shaped groove perpendicular to the thickness direction; or, the upper insulating member, the end plate and the lower insulating member are all inserted into the U-shaped groove perpendicular to the thickness direction; or, the end plate and the lower insulating member are both inserted into the U-shaped groove perpendicular to the thickness direction. In a battery provided with this end cap structure, the clamping assembly can be used to clamp the upper insulating member and the end plate to each other, or to clamp the upper insulating member, the end plate and the lower insulating member to each other, or to clamp the end plate and the lower insulating member to each other, thereby fixing the upper insulating member and the end plate to each other, or fixing the upper insulating member, the end plate and the lower insulating member to each other, or fixing the end plate and the lower insulating member to each other, thereby avoiding loosening between the upper fixing plate and the end plate and / or between the lower fixing plate and the end plate. The above-mentioned setting fixes the upper insulating member and / or the lower insulating member to the end plate, which can avoid the deformation of other components such as the sealing member at a later stage, which may cause the upper insulating member and / or the lower insulating member to fail to be fixed to the end plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The structure of the end cover structure in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0027] Figure 2 The structure of the end cover structure in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0028] Figure 3 Schematic diagram of the explosion of the end cover structure in the embodiment of the utility model Figure 1 ;

[0029] Figure 4 Schematic diagram of the explosion of the end cover structure in the embodiment of the utility model Figure 2 ;

[0030] Figure 5 The structure of the end cover structure in the embodiment of the utility model is shown in FIG. Figure 3 ;

[0031] Figure 6 for Figure 5 Cross-sectional view at AA in the middle;

[0032] Figure 7 for Figure 6 Cross-sectional view at the middle BB.

[0033] In the picture:

[0034] Y, thickness direction;

[0035] 1. Shell; 11. End plate; 111. First through hole; 112. First pressure relief hole; 113. Sink; 114. First liquid injection hole;

[0036] 2. Lower insulating member; 21. Second through hole; 22. Tab guide structure; 221. First guide surface; 222. Second guide surface;

[0037] 3. Upper insulating member; 31. Third through hole; 32. Flange ring;

[0038] 4. Clamping assembly; 41. Clamping member; 411. U-shaped groove; 42. Connecting plate;

[0039] 5. Explosion-proof valve. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] like Figures 1 to 7 As shown, this embodiment provides an end cover structure, which includes an end plate 11, a lower insulating member 2, an upper insulating member 3 and a clamping assembly 4. The end plate 11 is provided with a first through hole 111 along its thickness direction Y; the lower insulating member 2 is attached to one side of the end plate 11 along the thickness direction Y, and the lower insulating member 2 is provided with a second through hole 21; the upper insulating member 3 is attached to the other side of the end plate 11 along the thickness direction Y, and the lower insulating member 2 is provided with a third through hole 31. The first through hole 111, the second through hole 21 and The third through holes 31 are connected in sequence to form a pole ear hole; the clamping assembly 4 includes a clamping member 41, the clamping member 41 is provided with a U-shaped groove 411, the clamping member 41 is inserted in the pole ear hole, the upper insulating member 3 and the end plate 11 are both inserted in the U-shaped groove 411 perpendicular to the thickness direction Y; or, the upper insulating member 3, the end plate 11 and the lower insulating member 2 are all inserted in the U-shaped groove 411 perpendicular to the thickness direction Y; or, the end plate 11 and the lower insulating member 2 are both inserted in the U-shaped groove 411 perpendicular to the thickness direction Y. In a battery provided with this end cap structure, the clamping assembly 4 can be used to clamp the upper insulating member 3 and the end plate 11 to each other, or to clamp the upper insulating member 3, the end plate 11 and the lower insulating member 2 to each other, or to clamp the end plate 11 and the lower insulating member 2 to each other, thereby fixing the upper insulating member 3 and the end plate 11 to each other, or fixing the upper insulating member 3, the end plate 11 and the lower insulating member 2 to each other, or fixing the end plate 11 and the lower insulating member 2 to each other, thereby avoiding loosening between the upper insulating member 3 and the end plate 11 and / or between the lower insulating member 2 and the end plate 11. The above-mentioned setting fixes the upper insulating member 3 and / or the lower insulating member 2 to the end plate 11, and can avoid the deformation of other components such as the sealing member in the later stage, which may cause the upper insulating member 3 and / or the lower insulating member 2 to fail to be fixed to the end plate 11.

[0045] Specifically, the upper insulating member 3 and the lower insulating member 2 are both made of elastic rubber material.

[0046] Optionally, two tab holes are provided, and two clamping members 41 are provided, and the two clamping members 41 are disposed in a one-to-one correspondence in the two tab holes. In this embodiment, this arrangement can further enhance the fixing stability between the upper insulator 3 and the end plate 11 and / or between the lower insulator 2 and the end plate 11.

[0047] Optionally, the clamping assembly 4 further includes a connecting plate 42, and the two clamping members 41 are fixedly mounted at intervals on the connecting plate 42. In this embodiment, this arrangement can prevent the upper insulating member 3, the lower insulating member 2, and the end plate 11 from falling out of the U-shaped groove 411, thereby improving the fixing stability between the upper insulating member 3 and the end plate 11 and / or between the lower insulating member 2 and the end plate 11.

[0048] Optionally, the clamping assembly 4 is an integrally formed part. In this embodiment, the clamping assembly 4 is formed by bending a single sheet of material. In other embodiments, the clamping assembly 4 is manufactured by an additive manufacturing process or an injection molding process. Specifically, the clamping assembly 4 is manufactured by an epoxy resin plate or a metal material.

[0049] Optionally, the clamping assembly 4 is elastic. Optionally, the tab hole is a rectangular hole; a tab guide structure 22 is provided on the side of the lower insulating member 2 away from the end plate 11. The tab guide structure 22 includes a first guide surface 221 and a second guide surface 222. The first guide surface 221 and the second guide surface 222 are respectively provided on either side of the tab hole along the width direction. The first guide surface 221 and the second guide surface 222 and the lower insulating member 2 form a trapezoidal groove. In this embodiment, the tab guide structure 22 can improve the shape of the tab after it is folded, protect the tab, and prevent the tab from shorting between the tab and the housing 1 due to poor tab folding.

[0050] Optionally, a recessed groove 113 is formed on one side of the end plate 11 where the upper insulating member 3 is disposed, and the tab hole is located within the recessed groove 113. The upper insulating member 3 is disposed within the recessed groove 113, and the distance between the upper surface of the upper insulating member 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, the distance that the upper surface of the upper insulating member 3 protrudes from the surface of the end plate 11 is too great, which is not conducive to improving the volume utilization of the battery. The distance that the upper surface of the upper insulating member 3 protrudes from the surface of the end plate 11 is too small, resulting in low strength of the end plate 11 and detrimental to battery safety.

[0051] Optionally, a flange ring 32 is protruded from the outer peripheral wall of the upper insulating member 3. The flange ring 32 abuts against the end plate 11. The flange ring 32 has a ring width b, where 0 < b ≤ 10 mm. In this embodiment, an excessively large ring width of the flange ring 32 may increase weight, material, and cost.

[0052] Optionally, the end plate 11 is provided with a first pressure relief hole 112, and the lower insulating member 2 is provided with a second pressure relief hole opposite to the first pressure relief hole 112. The end cap structure also includes an explosion-proof valve 5, which seals the first pressure relief hole 112. In this embodiment, the function of the explosion-proof valve 5 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 are required.

[0053] Optionally, the end plate 11 is provided with a first injection hole 114, and the lower insulating member 2 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. After the injection is completed, considering the sealing performance to ensure that the electrolyte does not leak out, the injection hole is usually sealed using methods such as laser welding to ensure its sealing.

[0054] 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.

[0055] 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 (Y) thereof; A lower insulating member (2) is attached to one side of the end plate (11) along the thickness direction (Y), and the lower insulating member (2) is provided with a second through hole (21); An upper insulating member (3) is attached to the other side of the end plate (11) along the thickness direction (Y), and the lower insulating member (2) is provided with a third through hole (31), wherein the first through hole (111), the second through hole (21) and the third through hole (31) are sequentially connected to form a pole lug hole; A clamping assembly (4) comprises a clamping member (41), wherein the clamping member (41) is provided with a U-shaped groove (411), the clamping member (41) is inserted into the pole ear hole, and the upper insulating member (3) and the end plate (11) are both inserted into the U-shaped groove (411) perpendicular to the thickness direction (Y); or, the upper insulating member (3), the end plate (11) and the lower insulating member (2) are all inserted into the U-shaped groove (411) perpendicular to the thickness direction (Y); or, the end plate (11) and the lower insulating member (2) are both inserted into the U-shaped groove (411) perpendicular to the thickness direction (Y).

2. The end cap structure according to claim 1, characterized in that: There are two pole lug holes, and two clamping members (41) are provided. The two clamping members (41) are arranged in a one-to-one correspondence in the two pole lug holes.

3. The end cap structure according to claim 2, characterized in that: The clamping assembly (4) further comprises a connecting plate (42), and the two clamping members (41) are fixedly arranged on the connecting plate (42) at intervals.

4. The end cap structure according to claim 3, characterized in that: The clamping assembly (4) is an integrally formed part.

5. The end cap structure according to claim 1, characterized in that: The pole ear hole is a rectangular hole; A tab guide structure (22) is provided on a side of the lower insulating member (2) away from the end plate (11), and the tab guide structure (22) comprises a first guide surface (221) and a second guide surface (222), the first guide surface (221) and the second guide surface (222) being respectively provided on both sides of the tab hole along the width direction, and the first guide surface (221), the second guide surface (222) and the lower insulating member (2) are arranged to form a trapezoidal groove.

6. The end cap structure according to claim 1, characterized in that: A recessed groove (113) is provided on one side of the end plate (11) on which the upper insulating member (3) is provided, and the pole lug hole is located in the recessed groove (113); The upper insulating member (3) is arranged in the sink (113), the distance between the upper surface of the upper insulating member (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.

7. The end cap structure according to claim 1, characterized in that: A flange ring (32) is protruding from the outer peripheral wall of the upper insulating member (3), the flange ring (32) abuts against the end plate (11), and the ring width of the flange ring (32) 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 (112), and the lower insulating member (2) is provided with a second pressure relief hole opposite to the first pressure relief hole (112); It also includes an explosion-proof valve (5), which closes the first pressure relief hole (112).

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 lower insulating member (2) 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