CN221486647U - End cover, battery and electric equipment - Google Patents

Abstract

The utility model relates to an end cover, a battery and electric equipment, which comprises a cover plate, a pole and an insulating connecting piece; the cover plate is used for being connected with a battery shell of the battery; the pole is used for being electrically connected with the pole core of the battery; the insulating connecting piece is connected between the pole and the cover plate and electrically isolates the cover plate from the pole; the cover plate is provided with a first surface and a second surface, and the first surface and the second surface are oppositely arranged in the thickness direction of the end cover; the second surface is not overlapped with the pole along the direction from the first surface to the second surface; and/or, along the direction from the second surface to the first surface, the first surface is not overlapped with the pole. An insulating member for separating at least one side of the cover plate in the thickness direction from the pole is not required to be provided between the cover plate and the pole, so that the thickness of the end cover can be reduced. After the battery is assembled later, the space occupied by the end cover can be reduced in the height direction of the battery (namely the thickness direction of the cover plate).

Description

End cover, battery and electric equipment

Technical Field

The utility model belongs to the technical field of batteries, and relates to an end cover, a battery and electric equipment.

Background

The cylindrical battery comprises a battery shell, a pole core and an end cover, wherein the end cover is connected with the battery shell to form an installation space, and the pole core is installed in the installation space.

The end cover of the battery generally comprises a cover plate, a pole column and an insulating piece, wherein the end cover is connected with the battery shell, and the pole column is electrically connected with the pole core. In the related art, a pole is riveted on a cover plate, and an insulating member is arranged between the pole and the cover plate to realize insulating seal between the pole and the cover plate.

However, the thickness of the end cover is larger in this arrangement, which reduces the space occupied by the battery pole core when the battery is of the same size.

Disclosure of utility model

Aiming at the problem of larger thickness of an end cover of a battery in the prior art, the end cover, the battery and electric equipment are provided.

In order to solve the technical problems, in one aspect, an embodiment of the present utility model provides an end cover, including a cover plate, a pole, and an insulating connecting member; the cover plate is used for being connected with a battery shell of the battery; the pole is used for being electrically connected with the pole core of the battery; the insulating connecting piece is connected between the pole and the cover plate and electrically isolates the cover plate from the pole; the cover plate is provided with a first surface and a second surface, and the first surface and the second surface are oppositely arranged in the thickness direction of the end cover; along a direction from the first surface to the second surface, the second surface does not overlap the pole; and/or, along the direction from the second surface to the first surface, the first surface is not overlapped with the pole.

Optionally, in a thickness direction of the cover plate, the polar post is not overlapped with the cover plate.

Optionally, the cover plate further has a mounting hole, and the mounting hole penetrates through the first surface and the second surface; the pole is arranged in the mounting hole; the insulating connecting piece is connected between the pole and the inner wall of the mounting hole formed by the cover plate.

Optionally, the insulating connector is a closed loop structure surrounding the pole.

Optionally, a first mounting groove is formed in the insulating connecting piece, and a protruding portion is formed in the cover plate and matched with the first mounting groove so as to connect the cover plate and the insulating connecting piece; and/or the insulating connecting piece is provided with a second mounting groove, the pole is provided with an extension part, and the extension part is matched with the second mounting groove so as to realize the connection of the pole and the insulating connecting piece.

Optionally, the pole has a first connection part, and the first connection part is used for connecting a busbar outside the battery; the first connecting part is a boss structure formed by protruding the polar column along the direction from the second surface to the first surface; and/or the pole post is also provided with a second connecting part which is used for connecting a current collecting disc in the battery; the second connecting part is a boss structure formed by protruding the polar column along the direction from the first surface to the second surface.

Optionally, in a thickness direction of the cover plate, a surface of the first connecting portion facing away from the second connecting portion is flush with the first surface; and/or, along the direction from the first surface to the second surface, the second connecting part protrudes out of the second surface.

Optionally, the cover plate is provided with a first area, the pole is provided with a second area, and the first area and the second area are both in contact with the insulating connecting piece; the first area and the second area are provided with nanopores; the insulating connector fills the nanopore.

Optionally, the insulating connecting piece is an injection molding piece, and the end cover, the pole and the insulating connecting piece are of an injection molding integrated structure; the cover plate is a metal plate.

In order to solve the above technical problems, another aspect of the present utility model provides a battery, including a battery case, a pole core, and an end cap as described in any one of the above; the battery pack comprises a battery shell, a battery post, a cover plate and a terminal post, wherein the battery post is arranged in the battery shell, the cover plate of the end cover is connected to the battery shell, and the terminal post of the end cover is electrically connected with the terminal lug of the battery post.

Optionally, the battery further includes a current collecting disc, and the current collecting disc is disposed in the battery case and electrically connected to the pole and the pole core, respectively.

In order to solve the technical problems, on the other hand, an embodiment of the utility model provides electric equipment, which comprises the battery.

In the end cover, the battery and the electric equipment provided by the embodiment of the utility model, an insulating piece for separating the pole and the cover plate is not required to be arranged in the thickness direction of the end cover, so that the thickness of the end cover can be reduced. After the battery is assembled later, the space occupied by the end cover can be reduced in the height direction of the battery (namely, the thickness direction of the end cover). In addition, on the premise that the sizes of the batteries are the same, the space for installing the pole core in the battery case can be increased by adopting the arrangement of the embodiment, and the energy density of the battery is improved.

Drawings

FIG. 1 is a schematic view of a prior art end cap;

Fig. 2 is a schematic structural view of a battery according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of a battery provided in an embodiment of the utility model;

Fig. 4 is an exploded view of a battery according to an embodiment of the present utility model;

Fig. 5 is a schematic structural view of an end cover of a battery according to an embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of an end cap of a cell provided in an embodiment of the utility model;

Fig. 7 is a schematic structural view of a post of an end cap of a battery according to an embodiment of the present utility model.

Reference numerals in the specification are as follows:

100. a battery;

1. A battery case; 11. a housing; 12. a bottom plate;

2. A pole core;

3. An end cap; 31. a cover plate; 311. a first surface; 312. a second surface; 313. a mounting hole; 314. a protruding portion; 32. a pole; 321. an extension; 322. a first connection portion; 323. a second connecting portion; 324. a first end face; 325. a second end face; 33. an insulating connector; 331. a first mounting groove; 332. a second mounting groove; 34. an insulating layer;

4. Sealing nails;

5. sealing cover;

6. A first collecting tray;

7. a second collecting tray;

8. insulating glue;

9. And (5) tab protection glue.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 1, the design manner in which the pole 11a of the end cap 1a is riveted to the cover plate 12a in the prior art is shown, in this manner, in the thickness direction of the cover plate 12a, the cover plate 12a has a first surface and a second surface which are oppositely arranged, and the cover plate 12a is further provided with a mounting hole, wherein the mounting hole is a through hole penetrating from the first surface to the second surface; after riveting, along the thickness direction of the cover plate 12a, the pole 11a is provided with a first pressing section 111a, a connecting section 112a and a second pressing section 113a which are sequentially connected, the connecting section 112a is positioned in the avoidance hole, the first pressing section 111a and the second pressing section 113a are positioned outside the mounting hole, a first insulating piece 13a is arranged between the first pressing section 111a and the first surface, a second insulating piece 14a is also arranged between the second pressing section 113a and the second surface, wherein the first pressing section 111a presses the first insulating piece 13a on the first surface, and the second pressing section 113a presses the second insulating piece 14a on the second surface. In this way, the thickness of the end cap 1a is large, wherein the thickness direction of the end cap 1a is the thickness direction of the cover plate 12 a.

In order to reduce the thickness of the end cap 3, as shown in fig. 2 to 6, in an embodiment of the present application, the battery 100 includes a battery case 1, a pole core 2, and an end cap 3, the pole core 2 is disposed in the battery case 1, and the end cap 3 is disposed on the battery case 1 and electrically connected with the tab of the pole core 2. Wherein the end cap 3 comprises a cover plate 31, a pole 32 and an insulating connecting piece 33; the cover plate 31 is used for being connected with the battery case 1, and the pole post 32 is used for being electrically connected with the pole core 2; the insulating connector 33 connects the pole 32 and the cover plate 31, and electrically isolates the cover plate 31 from the pole 32; the cap plate 31 has a first surface 311 and a second surface 312, the first surface 311 and the second surface 312 being disposed opposite to each other in the thickness direction of the end cap 3, the second surface 312 not overlapping the pole 32 along the direction from the first surface 311 to the second surface 312; and/or, along the direction from the second surface 312 to the first surface 311, the first surface 311 does not overlap the pole 32.

The thickness direction of the cover plate 31 is the thickness direction of the end cap 3.

Along the direction from the first surface 311 to the second surface 312, the second surface 312 not overlapping the pole 32 may refer to: the orthographic projections of the second surface 312 and the pole 23 do not overlap along the direction from the first surface 311 to the second surface 312, i.e., the second surface 312 is not opposite to the pole 23 along the direction from the first surface 311 to the second surface 312. It will be appreciated that in some embodiments of the application, neither of the posts 23 projects beyond the second surface 312 in the direction from the first surface 311 to the second surface 312, and in other embodiments of the application, a portion of the post 23 (defining the portion as the first portion) projects beyond the second surface 312 in the direction from the first surface 311 to the second surface 312, but in an orthographic projection on a plane perpendicular to the thickness direction of the end cap 3, the projections of the first portion and the projections of the second surface 312 do not overlap.

Along the direction from the second surface 312 to the first surface 311, the first surface 311 not overlapping the pole 32 may refer to: the orthographic projections of the first surface 311 and the pole 23 do not overlap along the direction from the second surface 312 to the first surface 311, i.e., the first surface 311 and the pole 23 are not opposite in the direction from the second surface 312 to the first surface 311. It will be appreciated that in some embodiments of the application, neither of the posts 23 projects beyond the first surface 311 in the direction from the second surface 312 to the first surface 311, and in other embodiments of the application, a portion of the post 23 (defining the portion as the second portion) projects beyond the first surface 311 in the direction from the second surface 312 to the first surface 311, but in an orthographic projection on a plane perpendicular to the thickness direction of the end cap 3, the projection of the second portion and the projection of the first surface 311 do not overlap.

In comparison with the arrangement shown in fig. 1, in the arrangement of the present embodiment, the second surface 312 does not overlap the pole 32 due to the direction along the first surface 311 to the second surface 312; and/or, along the direction from the second surface 312 to the first surface 311, the first surface 311 does not overlap with the pole 32, i.e., at least one side of the pole 32 does not protrude from the surface of the end cap 3 in the thickness direction, and an insulator for separating the two is not required between at least one side of the cover plate 31 and the pole 32 in the thickness direction, so that the thickness of the end cap 3 can be reduced. After the battery 100 is assembled later, the space occupied by the end cap 3 can be reduced in the height direction of the battery 100 (i.e., the thickness direction of the cap plate 31). In addition, on the premise that the sizes of the batteries 100 are the same, the space for mounting the pole cores 2 in the battery case 1 can be increased by adopting the arrangement of the embodiment, which is beneficial to improving the energy density of the batteries 100.

In addition, the following problems are also involved in the manner of riveting the pole 32 to the cap plate 31 in the prior art: in the riveting manner, the thickness of the pole 32 is limited, so that the current carrying capacity of the pole 32 is limited, which is not beneficial to being applied to occasions of matching with the high-power and high-capacity pole core 2, wherein the thickness direction of the pole 32 is the thickness direction of the end cover 3; in the riveting manner, the pole 32 needs to have a larger thickness, so that not only the space of the battery case 1 is occupied, but also the size and cost of the battery 100 are increased; in the riveting mode, the sealing element between the pole 32 and the cover plate 31 is a sealing ring, and most of the front sealing rings are products adopting import and are easy to be blocked by technology.

The thickness of the pole 32 is not limited by the arrangement mode of the embodiment, and the thickness of the pole 32 can be set according to actual requirements, so that the pole is beneficial to being applied to occasions matched with the high-power and high-capacity pole core 2; in addition, in the arrangement mode of the embodiment, the connection strength between the pole 32 and the cover plate 31 is realized by the insulating connecting piece 33, so that the pole 32 can be selected to have smaller thickness, thereby reducing the space occupied by the pole 32, and simultaneously, shortening the current carrying path and reducing the impedance of the pole 32 when the thickness of the pole 32 is reduced; in addition, in the arrangement mode of the present embodiment, there is no need to provide a seal ring between the pole 32 and the cover plate 31, so that the assembly difficulty of the battery 100 can be reduced, and the problem that the production of the battery 100 is affected due to the seal ring being blocked by technology can be avoided.

In addition, after the battery 100 is assembled, the first surface 311 is a surface of the cover 31 away from the pole core 2, and the second surface 312 is a surface of the cover 31 close to the pole core 21.

In an embodiment, the battery case 1 may be a metal case, for example, the battery case 1 may be an aluminum case, a steel case, or the like. The cover plate 31 may be a metal plate, and for example, the cover plate 31 may be an aluminum plate, a steel plate, or the like. In addition, the material of the post 32 may be aluminum, copper, or the like. The cap plate 31 may be coupled to the battery case 1 by welding, and sealing between the cap plate 31 and the battery case 1 may be accomplished by welding from a welded structure. In a specific production process, the cover may be attached to the battery case 1 by means of laser welding.

In one embodiment, the post 32 does not overlap the cap plate 31 in the thickness direction of the cap plate 31. Wherein, in the thickness direction of the end cap 3, the polar column 32 and the cover plate 31 are not overlapped may mean: in an orthographic projection on a plane perpendicular to the thickness direction of the end cap 3, the projection of the pole 32 does not overlap with the projection of the cover plate 31. At this time, along the direction from the first surface 311 to the second surface 312, the second surface 312 does not overlap the pole 32; and, along the direction from the second surface 312 to the first surface 311, the first surface 311 is not overlapped with the pole 32, so that the thickness of the whole end cover 3 can be further reduced.

As shown in fig. 6, in an embodiment, the cover plate 31 further has a mounting hole 313, the mounting hole 313 penetrating the first surface 311 and the second surface 312, i.e., in the thickness direction of the cover plate 31, the mounting hole 313 penetrating the cover plate 31; the pole 32 is disposed within the mounting hole 313; the insulating connecting member 33 is connected between the pole 32 and the inner wall of the cap plate 31 forming the mounting hole 313, that is, the insulating connecting member 33 connects the pole 32 and the inner wall of the mounting hole 313.

As shown in fig. 5 and 6, in one embodiment, in the manner in which the pole 32 is disposed within the mounting hole 313, the insulating connector 33 is a closed loop structure surrounding the pole 32 for achieving an insulating and sealed connection between the pole 32 and the inner wall of the mounting hole 313.

As shown in fig. 6, the insulating connector 33 has a first mounting groove 331, the cover plate 31 has a protrusion 314, and the protrusion 314 is matched with the first mounting groove 331 to realize connection between the insulating connector 33 and the cover plate 31, so that the connection between the two parts can be firmer.

Wherein, when the insulating connector 33 is in a closed loop structure, the first mounting groove 331 may be provided on an outer circumferential surface of the insulating connector 33, and the protrusion 314 may be a flange structure provided on an inner wall of the mounting hole 313. In addition, the protruding portion 314 and the first mounting groove 331 may have a closed loop structure, and the protruding portion 314 and the first mounting groove 331 surround the outside of the pole 32 after the insulating connecting member 33 is connected with the pole 32.

After the cap plate 31 is coupled with the insulating coupling member 33, the thickness of the protrusion 314 in the thickness direction of the cap plate 31 is matched with the width of the first mounting groove 331, for example, both may be equal. After the cover plate 31 is connected with the insulating connecting member 33, in the thickness direction of the cover plate 31, the first mounting groove 331 has a first side surface and a second side surface which are disposed at intervals, the protruding portion 314 is located between the first side surface and the second side surface, and the protruding portion 314 is connected with the bottom surface, the first side surface and the second side surface of the first mounting groove 331, respectively. In addition, the bottom surface of the first mounting groove 331 may intersect the first and second side surfaces, respectively.

In one embodiment, the thickness of the protrusion 314 is smaller than the thickness of the cap plate 31 in the thickness direction of the cap 3. In addition, the surface of the protrusion 314 facing away from the first surface 311 and the second surface 312 may be flush in the thickness direction of the end cap 3, and the surface of the protrusion 314 facing away from the second surface 312 is spaced apart from the first surface 311 by a certain distance. After assembly, the surface of the protrusion 314 facing away from the first surface 311 may be connected to the second side surface, the surface of the protrusion 314 facing away from the second surface 312 may be connected to the first side surface, and in addition, the surface of the protrusion 314 facing away from the inner wall of the mounting hole 313 may be connected to the bottom surface of the first mounting groove 331 in the radial direction of the mounting hole 313.

As shown in fig. 6 and 7, the insulating connecting member 33 has a second mounting groove 332, the pole 32 has an extension 321, and the extension 321 is matched with the second mounting groove 332 to realize connection between the insulating connecting member 33 and the pole 32, so that the connection between the two can be firmer.

When the insulating connecting member 33 is in a closed-loop structure, the second mounting groove 332 may be disposed on an inner ring surface of the insulating connecting member 33, the extension portion 321 may be a flange structure on the pole 32, both the extension portion 321 and the first mounting groove 331 may be in a closed-loop structure, and after the insulating connecting member 33 is connected with the pole 32, the second mounting groove 332 is disposed around the pole 32.

After the cap plate 31 is coupled with the insulating coupling member 33, the thickness of the extension 321 matches the width of the second mounting groove 332 in the thickness direction of the cap plate 31, for example, both may be equal. After the pole 32 is connected to the insulating connector 33, the second mounting groove 332 has a third side and a fourth side disposed at intervals in the thickness direction of the cover plate 31, and after the pole 32 is connected to the insulating connector 33, the extension 321 is located between the third side and the fourth side, and the extension 321 is connected to the bottom, the third side, and the fourth side of the second mounting groove 332, respectively. In addition, the bottom surface of the second mounting groove 332 may intersect the third side surface and the fourth side surface, respectively.

It should be understood that, in a practical scenario, the cover plate 31 and the insulating connecting member 33 may be connected by the protrusion 314 and the first mounting groove 331, and the pole 32 and the insulating connecting member 33 may be connected by the extension 321 and the second mounting groove 332, which may be both or only one of them.

In an embodiment, the insulating connecting member 33 is an injection molded member, and the cover plate 31 and the pole 32 can be connected together by injection molding during production, i.e. the end cover 3, the pole 32 and the insulating connecting member 33 are an injection molded integral structure. Compared with the connection mode of riveting the pole 32 on the cover plate 31 in the prior art, the arrangement mode of the embodiment does not need to apply force to the pole 32, and can avoid damage to the planeness of the pole 32, so that the pole 32 has better planeness, and further, the battery 100 is electrically connected with the busbar and other components.

As shown in fig. 6 and 7, in one embodiment, the post 32 has a first connection portion 322, and the first connection portion 322 is used to connect to a bus bar outside the battery 100; the first connection portion 322 is a boss structure formed by protruding the pole 32 along the direction from the second surface 312 to the first surface 311; and/or, the post 32 further has a second connection portion 323, the second connection portion 323 being for connecting a current collecting tray (hereinafter, the first current collecting tray 6) within the battery 100; the second connection portion 323 is a boss structure formed by protruding the pole 32 along the direction from the first surface 311 to the second surface 312. The outside of the battery 100 is the outside of the battery case 1, and the inside of the battery 100 is the inside of the battery case 1.

Through the setting of first connecting portion 322, can make utmost point post 32 be close to the busbar, make things convenient for the connection of utmost point post 32 and busbar, through the setting of second connecting portion 323, can make utmost point post 32 be close to the mass flow dish, make things convenient for the connection of utmost point post 32 and mass flow dish. When the pole 32 has both the first connecting portion 322 and the second connecting portion 323, the first connecting portion 322 and the second connecting portion 323 correspond to boss structures provided on both sides of the pole 32 opposite to each other in the thickness direction of the end cover 3.

In one embodiment, the second connecting portion 323 is a closed loop structure, which surrounds the first connecting portion 322.

In an embodiment, the pole 32 may be a stamped part, i.e., the first connecting portion 322 and the second connecting portion 323 are both stamped structures. In the thickness direction of the pole 32, the pole 32 has a first end surface 324 and a second end surface 325 disposed opposite to each other, wherein the thickness direction of the pole 32 is the thickness direction of the end cap 3, and the directions from the first end surface 324 to the second end surface 325 are the directions from the first surface 311 to the second surface 312.

During the stamping operation, the second surface 312 applies a force to the pole 32, so that the stressed area of the pole 32 protrudes towards the first surface 311, and a first connection portion 322 can be formed; meanwhile, the second connection portion 323 can be formed by applying a force to the pole 32 at the first surface 311 so that the force receiving area of the pole 32 protrudes toward the second surface 312.

In addition, the pole 32 has a side surface, one end of the side surface of the pole 32 intersects the first end surface 324, and the other end of the side surface of the pole 32 intersects the second end surface 325. The portion of the structure between the side surface of the post 32 and the second connecting portion 323 may be the extension portion 321 described above.

After assembly, the side surface of the pole 32 may be connected to the bottom surface of the second mounting groove 332, the first end surface 324 of the pole 32 may be connected to the third side surface of the second mounting groove 332, and the second end surface 325 of the pole 32 may be connected to the fourth side surface of the second mounting groove 332.

In an embodiment, in the thickness direction of the cover plate 31, a surface of the first connecting portion 322 facing away from the second connecting portion 323 is flush with the first surface 311; and/or, along the direction from the first surface 311 to the second surface 312, the second connection portion 323 protrudes from the second surface 312.

In the thickness direction of the cover plate 31, the surface of the first connecting portion 322 facing away from the second connecting portion 323 is flush with the first surface 311, so that the terminal post 32 and the bus bar can be conveniently connected under the condition that the thickness of the end cover 3 is fixed. At this time, in the thickness direction of the cap plate 31, the distance between the surface of the first connecting portion 322 facing away from the second connecting portion 323 and the second surface 312 is equal to the distance between the first surface 311 and the second surface 312.

The first connection portion 322 is arranged to protrude from the second surface 312 along the direction from the first surface 311 to the second surface 312, so that the connection between the pole 32 and the current collecting plate can be facilitated, and the short circuit between the cover plate 31 and the current collecting plate can be effectively avoided when the pole 32 is connected with the current collecting plate. At this time, in the thickness direction of the cap plate 31, the distance between the surface of the second connection portion 323 facing away from the first connection portion 322 and the first surface 311 is larger than the distance between the second surface 312 and the first surface 311.

Of course, in other embodiments, in the thickness direction of the cover plate 31, the distance between the surface of the first connecting portion 322 facing away from the second connecting portion 323 and the second surface 312 is larger or smaller than the distance between the first surface 311 and the second surface 312. In the thickness direction of the cap plate 31, a distance between a surface of the second connecting portion 323 facing away from the first connecting portion 322 and the first surface 311 is smaller than or equal to a distance between the second surface 312 and the first surface 311.

In one embodiment, the cover plate 31 has a first region 315, the post 32 has a second region 326, and the first region 315 and the second region 326 are in contact with the insulating connector 33; the first region 315 and the second region 326 are each provided with nanopores; the insulating connector 33 fills the nanopore. This arrangement makes the connection between the cover plate 31, the pole 32 and the insulating connector 33 more secure.

The cover plate 31 and the pole 32 may be connected together by nano injection molding, so that the connection strength and the connection tightness between the cover plate 31 and the pole 32 may be improved. In addition, when nano injection molding is adopted, even if the thickness of the pole 32 is small, the connection strength between the pole 32 and the cover plate 31 can be ensured, so that the thin design of the pole 32 is facilitated.

The material of the insulating connector 33 may be a nanomaterial such as PPS, which is an abbreviation of Polyphenylene sulfide, chinese name polyphenylene sulfide.

Further, the first region 315 may be a partial region of the protrusion 314, or the first region may be the protrusion 314. The second region 326 may be a partial region of the extension 321, or the second region 326 may be the extension 321.

As shown in fig. 6, in one embodiment, end cap 3 further includes an insulating layer 34, insulating layer 34 being disposed on second surface 312 of cover plate 31 so as to prevent cover plate 31 from electrically connecting with pole piece 2 of battery 100. The insulating layer 34 is mainly used to avoid the tab of the pole core 2 from being electrically connected with the cover plate 31.

In addition, the material of the insulating layer 34 may be PET or PP; wherein PET is the abbreviation of Polyethylene terephthalate, and the Chinese name is polyester resin; PP is an abbreviation for polypropylene, chinese name polypropylene. In addition, the insulating layer 34 may have a sheet structure, which may be provided on the second surface 312 of the cap plate 31 by adhesion.

As shown in fig. 3, in one embodiment, the battery case 1 includes a case 11 and a bottom plate 12, the case 11 and the bottom plate 12 are connected, and the case 11 and the bottom plate 12 are enclosed to form an open-ended accommodating cavity, the pole core 2 is mounted in the accommodating cavity, and the end cap 3 is connected to the case 11 and closes the opening of the accommodating cavity. The base plate 12 is also electrically connected to the tabs of the electrode core 2 to form the electrode of the battery 100, wherein one of the base plate 12 and the end cap 3 is connected to the positive tab and the other is connected to the negative tab.

The bottom plate 12 is provided with a liquid injection hole, and electrolyte can be injected into the battery case 1 from the liquid injection hole. At this time, the area of the second collecting plate 7 opposite to the liquid injection hole is provided with an avoidance hole, so as to prevent the second collecting plate 7 from shielding the liquid injection hole.

As shown in fig. 3 and 4, the battery 100 further includes a sealing nail, which is an insulating member such as rubber, and a sealing cover 5, which is provided in the liquid injection hole and seals the liquid injection hole. The sealing cover 5 is welded with the bottom plate 12 and completely covers the shielding sealing nails.

As shown in fig. 3 and 4, in an embodiment, the battery 100 further includes a first current collecting plate 6, where the first current collecting plate 6 is disposed in the housing 11 and electrically connects the pole post 32 and the pole core 2, that is, the pole post 32 and the pole tab are electrically connected through the first current collecting plate 6, specifically, the pole tab is welded to the first current collecting plate 6, and the second connection portion 323 of the pole post 32 is also welded to the first current collecting plate 6.

As shown in fig. 3 and 4, in an embodiment, the battery 100 further includes a second current collecting plate 7, where the second current collecting plate 7 is disposed in the battery case 1 and electrically connected to the bottom plate 12 and the pole core 2, that is, the bottom plate 12 and the pole tab are electrically connected through the second current collecting plate 7, specifically, the pole tab is welded to the second current collecting plate 7, and the bottom plate 12 is also welded to the second current collecting plate 7.

As shown in fig. 3 and 4, in an embodiment, the battery 100 further includes an insulating glue 8, where the material of the insulating glue 8 may be PP or PET, and the insulating glue 8 is wrapped on the outer side of the pole core 2, so as to prevent the pole core 2 from contacting the battery case 1 to cause lithium intercalation corrosion.

As shown in fig. 3 and fig. 4, in an embodiment, the battery 100 further includes a tab protection glue 9, where the material of the tab protection glue 9 may be PP or PET, and the tab protection glue 9 is wrapped on the outer side of the negative electrode tab, so as to prevent the negative electrode tab from contacting the battery case 1 to cause lithium intercalation corrosion.

The utility model also provides electric equipment, which comprises the battery in any embodiment. The electric equipment can be a vehicle, energy storage equipment and the like, and the embodiment is not particularly limited herein.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (12)

1. An end cover is characterized by comprising a cover plate, a pole and an insulating connecting piece;

the cover plate is used for being connected with a battery shell of the battery;

the pole is used for being electrically connected with the pole core of the battery;

The insulating connecting piece is connected between the pole and the cover plate and electrically isolates the cover plate from the pole;

The cover plate is provided with a first surface and a second surface, and the first surface and the second surface are oppositely arranged in the thickness direction of the end cover;

Along a direction from the first surface to the second surface, the second surface does not overlap the pole; and/or, along the direction from the second surface to the first surface, the first surface is not overlapped with the pole.

2. The end cap of claim 1, wherein the post does not overlap the cap plate in a thickness direction of the cap plate.

3. The end cap of claim 1, wherein the cover plate further has a first mounting hole extending through the first surface and the second surface;

The pole is arranged in the mounting hole;

the insulating connecting piece is connected between the pole and the inner wall of the mounting hole formed by the cover plate.

4. The end cap of claim 3, wherein the insulating connection is a closed loop structure surrounding the pole.

5. The end cap of claim 1, wherein the insulating connector has a first mounting slot thereon, and the cover plate has a protrusion that mates with the first mounting slot to effect connection of the cover plate to the insulating connector; and/or the number of the groups of groups,

The insulating connecting piece is provided with a second mounting groove, the pole is provided with an extension part, and the extension part is matched with the second mounting groove so as to realize the connection of the pole and the insulating connecting piece.

6. The end cap of claim 1, wherein the post has a first connection portion for connecting a buss bar outside the battery; the first connecting part is a boss structure formed by protruding the polar column along the direction from the second surface to the first surface; and/or the number of the groups of groups,

The pole post is also provided with a second connecting part which is used for connecting a current collecting disc in the battery; the second connecting part is a boss structure formed by protruding the polar column along the direction from the first surface to the second surface.

7. The end cap of claim 6, wherein a surface of the first connection portion facing away from the second connection portion is flush with the first surface in a thickness direction of the cover plate; and/or the number of the groups of groups,

The second connection portion protrudes from the second surface in a direction from the first surface to the second surface.

8. The end cap of claim 1, wherein the cover plate has a first region thereon and the post has a second region thereon, both the first region and the second region being in contact with the insulating connector;

The first area and the second area are provided with nanopores;

the insulating connector fills the nanopore.

9. The end cap of claim 1, wherein the insulating connector is an injection molded piece, the end cap, the post, and the insulating connector being an injection molded integral structure;

The cover plate is a metal plate.

10. A battery comprising a battery case, a pole piece, and an end cap according to any one of claims 1-9;

The battery pack comprises a battery shell, a battery post, a cover plate and a terminal post, wherein the battery post is arranged in the battery shell, the cover plate of the end cover is connected to the battery shell, and the terminal post of the end cover is electrically connected with the terminal lug of the battery post.

11. The battery of claim 10, further comprising a current collecting tray disposed within the battery housing and electrically connecting the post and the pole core, respectively.

12. A powered device comprising a battery as claimed in claim 10 or 11.