End cover structure and battery

Abstract

The utility model relates to the technical field of batteries, in particular to 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 binding tape, two first through holes are formed in a leading-out area of the end plate at intervals, and the first through holes penetrate through the end plate along the thickness direction of the end plate; the lower insulating part is attached to one side of the end plate in the thickness direction, two second through holes are formed in the area, opposite to the leading-out area, of the lower insulating part, and the two second through holes are in one-to-one correspondence with the two first through holes; the upper insulating part is attached to the other side of the end plate, two third through holes are formed in the area, opposite to the leading-out area, of the lower insulating part, and the two third through holes correspond to the two first through holes one to one; the upper insulating part and / or the lower insulating part are / is independently bound and fixed with the end plate by the binding belt, so that the fixing failure of the upper insulating part and / or the lower insulating part on the end plate caused by the deformation of other parts such as a sealing part in the later period 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 lead-out region of the end plate is provided with two first through holes at intervals, and the first through holes penetrate the end plate along the thickness direction of the end plate;

[0009] a lower insulating member attached to one side of the end plate along the thickness direction, wherein the lower insulating member is provided with two second through holes in an area opposite to the lead-out area, and the two second through holes correspond one-to-one to the two first through holes;

[0010] An upper insulating member is attached to the other side of the end plate along the thickness direction, and two third through holes are provided in an area of ​​the lower insulating member opposite to the lead-out area, and the two third through holes correspond to the two first through holes one-to-one;

[0011] a binding strap, wherein the binding strap binds and fixes the upper insulating member and the end plate, and the binding straps are passed through the two first through holes and the two third through holes;

[0012] Alternatively, the binding straps bind and fix the upper insulating member, the end plate, and the lower insulating member, and the binding straps are passed through the two first through holes, the two second through holes, and the two third through holes;

[0013] Alternatively, the binding straps bind and fix the end plate and the lower insulating member, and the binding straps are passed through the two first through holes and the two second through holes.

[0014] As a preferred technical solution for the end cover structure, the binding belt is an adhesive tape, and the binding belt is respectively adhesively bonded to the end plate, the upper insulating member, and the lower insulating member.

[0015] As a preferred technical solution for the end cover structure, the thickness of the binding belt is 25 μm-150 μm.

[0016] As a preferred technical solution for the end cover structure, along the length direction of the binding belt, a rib is protruded on a side surface of the binding belt away from the end plate.

[0017] As a preferred technical solution of the end cover structure, the second through hole is a rectangular hole;

[0018] Two tab guide structures are provided on the side of the lower insulating member away from the end plate, and the two tab guide structures correspond one-to-one to the two second through holes. The tab guide structure includes a first guide surface and a second guide surface, and the first guide surface and the second guide surface are respectively provided on both sides of the second through 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.

[0019] 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 third through hole is located in the recessed groove;

[0020] 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.

[0021] 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.

[0022] 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;

[0023] It also includes an explosion-proof valve, which closes the first pressure relief hole.

[0024] 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.

[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, a battery and a battery, which end cover structure includes an end plate, a lower insulating member, an upper insulating member and a binding band, wherein the lead-out area of ​​the end plate is provided with two first through holes at intervals, and the first through holes penetrate the end plate along the thickness direction of the end plate; the lower insulating member is attached to one side of the end plate along the thickness direction, and the area of ​​the lower insulating member opposite to the lead-out area is provided with two second through holes, and the two second through holes correspond one-to-one to the two first through holes; the upper insulating member is attached to the other side of the end plate along the thickness direction, and the area of ​​the lower insulating member opposite to the lead-out area is provided with two third through holes, and the two third through holes correspond one-to-one to the two first through holes; the binding band binds and fixes the upper insulating member and the end plate, and the binding bands are all passed through the two first through holes and the two third through holes; or, the binding band binds and fixes the upper insulating member, the end plate and the lower insulating member, and the binding bands are all passed through the two first through holes, the two second through holes and the two third through holes; or, the binding band binds and fixes the end plate and the lower insulating member, and the binding bands are all passed through the two first through holes and the two second through holes. In a battery equipped with this end cap structure, a binding strap can be used to securely fasten the upper insulator to the end plate, the upper insulator, the end plate, and the lower insulator, or the end plate and the lower insulator, preventing loosening between the upper fixing plate and the end plate and / or between the lower fixing plate and the end plate. This arrangement secures the upper and / or lower insulator to the end plate independently, preventing subsequent deformation of other components, such as the seal, from causing failure of the upper and / or lower insulator's fixation to the end plate. 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 3 Schematic 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 The structure of the end cover structure in the embodiment of the utility model is shown in FIG. Figure 3 ;

[0033] Figure 6 for Figure 5 Cross-sectional view at AA in the middle;

[0034] Figure 7 for Figure 6 Cross-sectional view at the middle BB.

[0035] In the picture:

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

[0039] 3. Upper insulating member; 31. Third through hole; 32. Flange ring;

[0040] 4. Binding tape;

[0041] 5. 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 7As 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 binding belt 4. The lead-out area of ​​the end plate 11 is provided with two first through holes 111 at intervals, and the first through holes 111 pass through the end plate 11 along the thickness direction Y of the end plate 11; the lower insulating member 2 is attached to one side of the end plate 11 along the thickness direction Y, and the area of ​​the lower insulating member 2 opposite to the lead-out area is provided with two second through holes 21, and the two second through holes 21 correspond one to one with the two first through holes 111; 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 opposite to the lead-out area. Two third through holes 31 are provided in the corresponding area, and the two third through holes 31 correspond one to one to the two first through holes 111; the binding strap 4 binds and fixes the upper insulating member 3 and the end plate 11, and the binding strap 4 is passed through the two first through holes 111 and the two third through holes 31; or, the binding strap 4 binds and fixes the upper insulating member 3, the end plate 11 and the lower insulating member 2, and the binding strap 4 is passed through the two first through holes 111, the two second through holes 21 and the two third through holes 31; or, the binding strap 4 binds and fixes the end plate 11 and the lower insulating member 2, and the binding strap 4 is passed through the two first through holes 111 and the two second through holes 21. In a battery equipped with this end cap structure, the binding strap 4 can be used to securely bind the upper insulator 3 and the end plate 11, or to securely bind the upper insulator 3, the end plate 11, and the lower insulator 2, or to securely bind the end plate 11 and the lower insulator 2, thereby preventing loosening between the upper fixing plate and the end plate 11 and / or between the lower fixing plate and the end plate 11. The above arrangement secures the upper insulator 3 and / or the lower insulator 2 independently to the end plate 11, thereby preventing subsequent deformation of other components, such as the seal, that could lead to failure of the upper insulator 3 and / or the lower insulator 2 to be secured to the end plate 11.

[0047] Specifically, the upper insulating member 3 and the lower insulating member 2 are both made of elastic rubber material.

[0048] Optionally, the end plate 11 has two lead-out regions, one for leading the positive electrode tab and the other for leading the negative electrode tab. In other embodiments, a single lead-out region may be provided, with both the positive and negative electrode tabs leading out from the lead-out region.

[0049] Optionally, the binding strap 4 is an adhesive tape, and the binding strap 4 is adhesively bonded to the end plate 11, the upper insulating member 3, and the lower insulating member 2. In this embodiment, the adhesive tape has an adhesive layer on one side, so that bonding it to the end plate 11, the upper insulating member 3, and the lower insulating member 2 can further enhance the stability of the mutual fixation between the end plate 11 and the upper insulating member 3 and / or the lower insulating member 2. In other embodiments, the binding strap 4 can also be a binding tape.

[0050] Optionally, the thickness of the binding tape 4 is 25 μm-150 μm. In this embodiment, this arrangement can avoid affecting the assembly of the end plate 11, the upper insulating member 3 and the lower insulating member 2.

[0051] Optionally, ribs are provided along the length of the binding strap 4 on the side away from the end plate 11. In this embodiment, the binding strap 4 is susceptible to deformation along its length when subjected to significant external force or after prolonged use. Therefore, ribs are provided along the side away from the end plate 11 to increase the tensile strength of the binding strap 4 and thereby enhance the stability of the fixing between the end plate 11 and the upper insulating member 3 and / or the lower insulating member 2.

[0052] Optionally, the second through hole 21 is a rectangular hole; two tab guide structures 22 are provided on the side of the lower insulating member 2 away from the end plate 11. The two tab guide structures 22 correspond one-to-one to the two second through holes 21. The tab guide structures 22 include 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 both sides of the second through hole 21 along the width direction. The first guide surface 221 and the second guide surface 222 and the lower insulating member 2 are arranged to 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 short-circuiting with the housing 1 due to poor tab folding shape.

[0053] Optionally, a recessed groove 112 is formed on one side of the end plate 11 where the upper insulating member 3 is disposed, and the first through hole 111 is located within the recessed groove 112. The upper insulating member 3 is disposed within the recessed groove 112, 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 too far from the surface of the end plate 11 is not conducive to improving the volume utilization of the battery. The distance that the upper surface of the upper insulating member 3 protrudes too far from the surface of the end plate 11 is not conducive to improving the volume utilization of the battery. The distance that the upper surface of the upper insulating member 3 protrudes too far from the surface of the end plate 11 is not conducive to improving the strength of the end plate 11, which is not conducive to the safety of the battery.

[0054] 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.

[0055] Optionally, the end plate 11 is provided with a first pressure relief hole 113, and the lower insulating member 2 is provided with a second pressure relief hole opposite to the first pressure relief hole 113. The end cap structure also includes an explosion-proof valve 5, which seals the first pressure relief hole 113. In this embodiment, the explosion-proof valve 5 is used to prevent thermal runaway accidents and avoid imbalances in pressure between the inside and outside of the battery pack. Furthermore, given that lithium batteries can instantly generate large amounts of toxic gases when they catch fire, timely and targeted pressure relief is required.

[0056] 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.

[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 two first through holes (111) are provided at intervals in the lead-out region of the end plate (11), and the first through holes (111) penetrate the end plate (11) along a thickness direction (Y) of the end plate (11); A lower insulating member (2) is attached to one side of the end plate (11) along the thickness direction (Y), and two second through holes (21) are provided in an area of ​​the lower insulating member (2) opposite to the lead-out area, and the two second through holes (21) correspond one-to-one to the two first through holes (111); An upper insulating member (3) is attached to the other side of the end plate (11) along the thickness direction (Y), and two third through holes (31) are provided in an area of ​​the lower insulating member (2) opposite to the lead-out area, and the two third through holes (31) correspond one-to-one to the two first through holes (111); a binding belt (4), wherein the binding belt (4) binds and fixes the upper insulating member (3) and the end plate (11), and the binding belt (4) is passed through the two first through holes (111) and the two third through holes (31); Alternatively, the binding belt (4) binds and fixes the upper insulating member (3), the end plate (11) and the lower insulating member (2), and the binding belt (4) is passed through the two first through holes (111), the two second through holes (21) and the two third through holes (31); Alternatively, the binding belt (4) binds and fixes the end plate (11) and the lower insulating member (2), and the binding belt (4) is passed through the two first through holes (111) and the two second through holes (21).

2. The end cap structure according to claim 1, characterized in that: The binding belt (4) is an adhesive tape, and the binding belt (4) is respectively adhesively bonded to the end plate (11), the upper insulating member (3), and the lower insulating member (2).

3. The end cap structure according to claim 2, characterized in that: The thickness of the binding belt (4) is 25 μm-150 μm.

4. The end cap structure according to claim 3, characterized in that: Along the length direction of the binding belt (4), a rib is protrudingly provided on a side surface of the binding belt (4) away from the end plate (11).

5. The end cap structure according to claim 1, characterized in that: The second through hole (21) is a rectangular hole; Two tab guide structures (22) are provided on a side of the lower insulating member (2) away from the end plate (11), and the two tab guide structures (22) correspond one-to-one to the two second through holes (21). The tab guide structure (22) includes a first guide surface (221) and a second guide surface (222), and the first guide surface (221) and the second guide surface (222) are respectively provided on both sides of the second through hole (21) 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 (112) is provided on one side of the end plate (11) on which the upper insulating member (3) is provided, and the third through hole (31) is located in the recessed groove (112); The upper insulating member (3) is arranged in the sink (112), 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 (113), and the lower insulating member (2) is provided with a second pressure relief hole opposite to the first pressure relief hole (113); It also includes an explosion-proof valve (5), 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 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).

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