CN219843126U - Pole core assembly, battery cell with same, battery pack and vehicle - Google Patents

Abstract

The utility model discloses a pole core component, a battery monomer, a battery pack and a vehicle with the pole core component, wherein the pole core component comprises: a pole core, wherein one end of the pole core in a first direction is provided with a first pole lug; the cover plate assembly is arranged at the end part of the pole core and comprises a current collecting disc and an insulating spacer ring, the current collecting disc is electrically connected with the first pole lug, and the insulating spacer ring is arranged at one side of the current collecting disc, which is away from the first pole lug; and the thermal shrinkage insulating film is coated on at least part of the peripheral wall of the pole core and part of the insulating spacer. According to the pole core assembly provided by the embodiment of the utility model, the thermal shrinkage insulating film is coated on the pole core and the cover plate assembly to insulate and protect the peripheral wall of the pole core and the current collecting disc, so that the peripheral wall of the pole core and the current collecting disc are prevented from being electrically connected with the shell of the battery cell, short circuit is avoided, the coating is stable, and the protection capability is strong.

Description

Pole core assembly, battery cell with same, battery pack and vehicle

Technical Field

The utility model relates to the technical field of batteries, in particular to a pole core assembly, a battery cell with the pole core assembly, a battery pack and a vehicle.

Background

The pole core insulating film of the cylindrical power battery in the related art is an insulating tape which is generally composed of polyolefin or polyester films and a binder, and the pole core insulating film can be directly bonded and wrapped with the pole core, but in the use process, the binder on the insulating film can react with electrolyte penetrating to the outer layer, so that the bonding strength between the insulating film and the pole core is reduced, and the protection capability of the pole core is reduced.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a pole core assembly, which is characterized in that a thermal shrinkage insulating film is coated on a pole core and a cover plate assembly to insulate and protect the peripheral wall of the pole core and a current collecting disc, so that the peripheral wall of the pole core and the current collecting disc are prevented from being electrically connected with a shell of a battery cell, short circuit is avoided, the coating is stable, and the protection capability is strong.

The utility model also provides a battery cell, a battery pack and a vehicle with the pole core assembly.

A pole piece assembly according to an embodiment of the first aspect of the present utility model comprises: a pole core, wherein one end of the pole core in a first direction is provided with a first pole lug; the cover plate assembly is arranged at the end part of the pole core and comprises a current collecting disc and an insulating spacer, the current collecting disc is electrically connected with the first pole lug, and the insulating spacer is arranged at one side of the current collecting disc, which is away from the first pole lug; and the thermal shrinkage insulating film is coated on at least part of the peripheral wall of the pole core and part of the insulating spacer.

According to the pole core assembly provided by the embodiment of the utility model, the thermal shrinkage insulating film is coated on the pole core and the current collecting disc so as to insulate and protect the peripheral wall of the pole core and the current collecting disc, so that the peripheral wall of the pole core and the current collecting disc are prevented from being electrically connected with the shell of the battery cell, and short circuit is prevented from being caused.

In addition, the pole core assembly according to the above embodiment of the present utility model may have the following additional technical features:

according to some embodiments of the present utility model, the insulating spacer is provided with a plurality of avoidance areas, the current collecting disc is provided with a plurality of connection areas, each connection area is welded with the first tab, the plurality of avoidance areas are arranged opposite to the plurality of connection areas one by one, and the heat-shrinkable insulating film is located at the outer sides of the plurality of avoidance areas so as to expose the plurality of avoidance areas.

According to some embodiments of the utility model, the cover plate assembly further comprises a cover plate disposed on a side of the insulating spacer facing away from the collector plate, the cover plate being exposed to the heat-shrinkable insulating film.

In some embodiments, the pole core is formed in a cylindrical shape, the minimum value of the radial distance between the outer edge of the cover plate and the outer peripheral wall of the pole core is d1, the radius of the pole core is R, and the value range of d1 is 4mm less than or equal to d1 < R.

According to some embodiments of the utility model, the pole core is provided with a second pole lug at the other end of the first direction, the second end face provided with the second pole lug is provided with an annular welding area, and the heat shrinkage insulating film covers a part of the second end face and exposes the welding area.

In some embodiments, the pole core is formed in a cylindrical shape, the minimum value of the radial distance between the outer edge of the welding area and the outer peripheral wall of the pole core is d2, the radius of the pole core is R, and the value range of d2 is 4mm less than or equal to d2 < R.

In some embodiments, the minimum value of the radial distance between the outer edge of the cover plate and the outer peripheral wall of the pole core is d1, the distance between the first end face of the pole core provided with the first pole ear and the surface of the insulating spacer facing away from the current collecting disc is w, and the radial length of the region of the insulating spacer covered by the heat-shrinkable insulating film is x1; the minimum value of the radial distance between the welding area and the peripheral wall of the pole core is d2, the length of the heat-shrinkable insulating film is h1, the length of the pole core is h2, and the value range of h1 is w+x1 < h1 less than or equal to h2+d1+d2.

According to a second aspect of the present utility model, an embodiment proposes a battery cell comprising a housing; according to an embodiment of the first aspect of the utility model, the pole core is arranged in the shell, and the cover plate assembly covers the end opening of the shell.

According to some embodiments of the utility model, the cover plate assembly further comprises: a conductive post extending along the first direction, the conductive post having a fixed end and an electrical connection end in the first direction, the current collecting plate being electrically connected to the electrical connection end; the metal connecting piece, the apron with insulating spacer coat in proper order in the first direction conductive column, the apron is fixed to the shell, the metal connecting piece with be equipped with first insulating part between the apron, the apron with pass through between the collector plate insulating separation of insulating spacer, the apron with be equipped with the sealing member between the conductive column, the stiff end with metal connecting piece fixed connection.

In some embodiments, the end of the housing has an aperture through which a portion of the cover assembly passes, the step of the cover rim being welded to the inner wall of the aperture.

According to the battery cell provided by the embodiment of the utility model, the heat-shrinkable insulating film is coated on the pole core and the current collecting disc by using the pole core assembly according to the embodiment of the first aspect of the utility model, so that the outer peripheral wall of the pole core and the current collecting disc are insulated and protected, the outer peripheral wall of the pole core and the current collecting disc are prevented from being electrically connected with the outer shell of the battery cell, short circuits are prevented from being caused, the coating is stable, the protection capability is strong, and meanwhile, the heat-shrinkable insulating film can be arranged on the pole core without other fixing structures, so that the complexity of a process is reduced, and the production cost is reduced.

According to a third aspect of the present utility model, an embodiment proposes a battery pack comprising a battery cell according to an embodiment of the second aspect of the present utility model.

According to the battery pack disclosed by the embodiment of the utility model, the battery cells according to the second aspect of the utility model are utilized, and the heat-shrinkable insulating film is coated on the pole core and the current collecting disc, so that the outer peripheral wall of the pole core and the current collecting disc are insulated and protected, the outer peripheral wall of the pole core and the current collecting disc are prevented from being electrically connected with the outer shell of the battery cells, short circuits are avoided, the coating is stable, the protection capability is strong, and meanwhile, the heat-shrinkable insulating film can be arranged on the pole core without other fixing structures, so that the complexity of a process is reduced, and the production cost is reduced.

An embodiment according to a fourth aspect of the utility model proposes a vehicle comprising a battery pack according to an embodiment of the third aspect of the utility model.

According to the vehicle disclosed by the embodiment of the utility model, the battery pack disclosed by the embodiment of the third aspect of the utility model is utilized, and the heat-shrinkable insulating film is coated on the pole core and the current collecting disc, so that the outer peripheral wall of the pole core and the current collecting disc are insulated and protected, the outer peripheral wall of the pole core and the current collecting disc are prevented from being electrically connected with the shell of the battery cell, short circuits are avoided, the coating is stable, the protection capability is strong, and meanwhile, the heat-shrinkable insulating film can be arranged on the pole core without other fixing structures, so that the complexity of a process is reduced, and the production cost is reduced.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic view of a pole core assembly in one direction according to an embodiment of the present utility model.

Fig. 2 is a partial enlarged view of fig. 1.

Fig. 3 is a schematic view of a pole core assembly in another orientation according to an embodiment of the present utility model.

Fig. 4 is a partial enlarged view of fig. 3.

Fig. 5 is a schematic structural view of a pole core assembly according to an embodiment of the present utility model, in which the heat-shrinkable insulating film does not cover the B-terminal.

Fig. 6 is a schematic structural view of a pole core and cover plate assembly according to an embodiment of the present utility model.

Fig. 7 is an exploded view of a pole core and cover plate assembly according to an embodiment of the present utility model.

Fig. 8 is a structural exploded view of a cap plate assembly according to an embodiment of the present utility model.

Fig. 9 is a cross-sectional view of a cover plate assembly according to an embodiment of the present utility model.

Fig. 10 is a schematic structural view of a heat-shrinkable insulating film according to an embodiment of the present utility model.

Reference numerals: the pole core assembly 1 is provided with a plurality of grooves,

the pole core 10, the first pole ear 11, the second pole ear 12, the first end face 13, the second end face 14, the welding area 141,

cover plate assembly 20, collector plate 21, connection region 211, insulating spacer 22, relief region 221, cover plate 23, conductive posts 24, fixed ends 241, electrical connections 242, metal connectors 25, first insulator 26, seal 27,

the insulating film 30 is heat-shrunk.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

The pole core assembly 1 according to the embodiment of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1 to 10, a pole core assembly 1 according to an embodiment of the present utility model includes a pole core 10, a cap plate assembly 20, and a heat-shrinkable insulating film 30.

The pole core 10 is provided with a first pole lug 11, the first pole lug 11 is positioned at one end of the pole core 10 in the first direction, the cover plate assembly 20 is arranged at the end of the pole core 10, the cover plate assembly 20 comprises a current collecting disc 21 and an insulating spacer 22, the current collecting disc 21 is welded with the first pole lug 11 so as to arrange the current collecting disc 21 at the first pole lug 11, and current on the pole core 10 can flow from the first pole lug 11 to the current collecting disc 21.

The insulating spacer 22 is arranged on one side of the current collecting disc 21, which is away from the first electrode lug 11, and the insulating spacer 22 is an insulating material piece so as to protect the surface of the current collecting disc 21, which is away from the first electrode lug 11, by using the insulating spacer 22, so that the current collecting disc 21 is isolated, and further, the current on the current collecting disc 21 can flow to a designated area, and potential safety hazards such as short circuit are avoided.

The heat-shrinkable insulating film 30 is coated on at least a part of the peripheral wall of the pole core 10, the heat-shrinkable insulating film 30 covers a part of the insulating spacer 22, and since the insulating spacer 22 is arranged on the side of the current collecting plate 21 facing away from the first pole ear 11, that is, the current collecting plate 21 is arranged between the first pole ear 11 and the insulating spacer 22, when the heat-shrinkable insulating film 30 coats at least a part of the peripheral wall of the pole core 10 and a part of the insulating spacer 22, the heat-shrinkable insulating film 30 can insulate and protect the peripheral wall of the pole core 10 and the current collecting plate 21, thus being convenient for reducing the leakage area of the current collecting plate 21 and being convenient for insulating and protecting a part of the protected area of the current collecting plate 21.

In the embodiment of the pole core 10 applied to the battery cell, the battery cell has a housing, the pole core 10 is disposed in the housing, so that the heat-shrinkable insulating film 30 is wrapped on at least a portion of the peripheral wall of the pole core 10, and the heat-shrinkable insulating film 30 covers a portion of the insulating spacer 22, so as to avoid the contact between the peripheral wall of the pole core 10 and the current collecting plate 21 and the housing, and avoid the electrical connection between the peripheral wall of the pole core 10 and the current collecting plate 21 and the housing, so as to avoid the problems of short circuit of the battery cell, thereby facilitating the improvement of the safety of the battery cell and the stability of the battery cell.

The first tab 11 of the pole core 10 is electrically connected with the current collecting plate 21, the insulating spacer 22 is located at the other side of the current collecting plate 21, the heat-shrinkable insulating film 30 covers at least a portion of the outer peripheral surface of the pole core 10 and a portion of the insulating spacer 22, and at this time, the insulating spacer 22 and the heat-shrinkable insulating film 30 jointly perform insulation protection on the current collecting plate 21, so that current on the current collecting plate 21 can flow to a designated area, and current on the current collecting plate 21 is prevented from flowing to the housing, and short circuit is prevented from occurring.

Further, the heat-shrinkable insulating film 30 is covered with a part of the insulating spacer 22 so that the heat-shrinkable insulating film 30 can cover the outer peripheral surface of the pole core 10 and the end portion of the pole core 10, and further, the heat-shrinkable insulating film 30 is bent at a position corresponding to the first tab 11 so that the heat-shrinkable insulating film 30 can be directly fixed to the outer peripheral surface of the pole core 10, thereby preventing the heat-shrinkable insulating film 30 from falling off from the outer peripheral surface of the pole core 10.

Specifically, when the temperature to which the heat-shrinkable insulating film 30 is subjected is higher than its own glass transition temperature, the heat-shrinkable insulating film 30 is converted from a glass state of a rigid solid to a fluid state, at which time the heat-shrinkable insulating film 30 can be stretched to adjust the shape, length, and the like of the heat-shrinkable insulating film 30, and after the stretching of the heat-shrinkable insulating film 30 is completed, the heat-shrinkable insulating film 30 is cooled, at which time the heat-shrinkable insulating film 30 is converted from the fluid state to the glass state, at which time the heat-shrinkable insulating film 30 can cover at least a part of the outer peripheral surface of the pole core 10 and cover a part of the insulating spacers 22.

Through this kind of mode to the insulating protection of pole core subassembly 1, be convenient for in time adjust shape and length etc. of thermal contraction insulating film 30 according to the specific shape of pole core subassembly 1, avoid extravagant resource, in addition, this kind of mode can be directly fix thermal contraction insulating film 30 cladding on the outer peripheral face of pole core 10, need not other spare part and glues or fix thermal contraction insulating film 30, be convenient for reduce the complexity of installation, reduce the technology degree of difficulty.

Therefore, according to the pole core assembly 1 of the embodiment of the utility model, the heat-shrinkable insulating film 30 is coated on the pole core 10 and the current collecting disc 21 to perform insulation protection on the outer peripheral wall of the pole core 10 and the current collecting disc 21, so that the outer peripheral wall of the pole core 10 and the current collecting disc 21 are prevented from being electrically connected with the shell of the battery cell, short circuit is avoided, the coating is stable, the protection capability is high, and meanwhile, the heat-shrinkable insulating film 30 can be arranged on the pole core 10 without other fixing structures, so that the complexity of a process is reduced, and the production cost is reduced.

The pole core assembly 1 according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1 to 10, a pole core assembly 1 according to an embodiment of the present utility model includes a pole core 10, a cap plate assembly 20, and a heat-shrinkable insulating film 30.

In some embodiments of the present utility model, as shown in fig. 8, the current collecting plate 21 is provided with a plurality of connection regions 211, and each connection region 211 is welded with the first tab 11 to stably fix the current collecting plate 21 at the first tab 11, so that the first tab 11 is electrically connected to the current collecting plate 21, and the current on the electrode core 10 can flow to the current collecting plate 21 through the first tab 11.

The insulating spacer 22 is provided with a plurality of avoidance areas 221, the plurality of avoidance areas 221 and the plurality of connection areas 211 are arranged in a one-to-one opposite mode, the heat shrinkage insulating film 30 is located on the outer sides of the plurality of avoidance areas 221 so that the plurality of avoidance areas 221 are exposed, so that when the current collecting disc 21 is welded to the first tab 11, welding equipment can reach the connection areas 211 through the avoidance areas 221, the connection areas 211 are operated, and further the connection areas 211 are welded with the first tab 11.

As shown in fig. 8, in the present embodiment, a plurality of connection regions 211 are disposed at intervals along the circumferential direction of the current collecting plate 21, the connection regions 211 are welded with the first tab 11 to enable the connection regions 211 to be fixed and electrically connected with the current collecting plate 21, a plurality of avoidance regions 221 are disposed at intervals along the circumferential direction of the insulating spacer 22, and the avoidance regions 221 are configured to penetrate the insulating spacer 22 along the first direction, and it should be understood that the above-mentioned directional limitation is only for convenience of description of the drawings, and no limitation is made on the actual installation position and direction of the pole core assembly 1.

In the first direction, the plurality of avoidance areas 221 and the plurality of avoidance areas 221 are opposite to each other, and in the installation process of the cover plate assembly 20, the cover plate assembly 20 can be assembled first, and then the current collecting plate 21 and the first tab 11 are welded. Therefore, the mounting difficulty of the cover plate assembly 20 can be reduced, and the practicability and reliability of the cover plate assembly 20 are improved.

In some embodiments of the present utility model, as shown in fig. 8 and 9, the cover plate assembly 20 further includes a cover plate 23, where the cover plate 23 is disposed on a side of the insulating spacer 22 facing away from the collecting tray 21, and the cover plate 23 is exposed to the heat-shrinkable insulating film 30, so as to protect the edge spacer 22 and the collecting tray 21 by using the cover plate 23.

In the embodiment in which the pole core assembly 1 is disposed in the battery cell casing, the pole core 10, the insulating spacer 22 and the current collecting disc 21 are disposed in the casing, and the cover plate 23 is located at the end of the casing, so as to protect components in the casing by using the cover plate 23, avoid that objects in the environment will scratch the components in the casing, and simultaneously facilitate the welding of the cover plate 23 and the end of the casing to close the casing, and protect the pole core assembly 1 in the casing.

Wherein, insulating spacer 22 sets up between apron 23 and current collecting plate 21 to isolated apron 23 and current collecting plate 21, avoid apron 23 and current collecting plate 21 to contact, avoid apron 23 and current collecting plate 21 electrical connection.

In some embodiments, the pole core 10 is disposed in a housing, the cover plate 23 is disposed at one end of the housing, the cover plate 23 is adapted to be fixed with the housing, the cover plate 23 is connected with the housing by welding to close the one end of the housing by the cover plate 23, and thereby the pole core 10, the heat-shrinkable insulating film 30, the current collecting plate 21 and the insulating spacer 22 are disposed in the housing, and the pole core 10, the heat-shrinkable insulating film 30, the current collecting plate 21 and the insulating spacer 22 are protected by the housing.

In some embodiments of the present utility model, the heat-shrinkable insulating film 30 is a single-layer or multi-layer polyolefin film and a high-molecular polyester film with heat-shrinkable characteristics, and the heat-shrinkable insulating film 30 has low price, low processing temperature, wide processing temperature range, simple and efficient process for coating the heat-shrinkable insulating film 30, and is convenient for cost reduction.

In some alternative embodiments of the present utility model, as shown in fig. 2, the pole core 10 is formed into a cylindrical shape, the minimum value of the radial distance between the outer edge of the cover plate 23 and the outer peripheral wall of the pole core 10 is d1, the radius of the pole core 10 is R, the value range of d1 is 4mm less than or equal to d1 < R, and 4mm less than or equal to d1 is used to avoid that the distance between the outer edge of the cover plate 23 and the outer peripheral wall of the pole core 10 is too small, the diameter of the cover plate 23 is prevented from being too large, and further, the insulating spacer 22 can separate the cover plate 23 from the pole core 10, and the insulating capability of the insulating spacer 22 on the cover plate 23 and the current collecting disc 21 is ensured; let d1 < R to be able to set the cover plate 23 in the proper position at one end of the pole core 10, make the cover plate 23 be able to protect the pole core 10, the collecting tray 21 and the insulating spacer 22, and at the same time facilitate the welding of the cover plate 23 with the end of the housing to close the housing, and protect the pole core assembly 1 inside the housing.

Specifically, when the cover plate 23 is disposed at the end of the pole core 10, the radial spacing between the outer edges of the different positions of the cover plate 23 and the outer peripheral wall of the pole core 10 may be different, so that the minimum value of the radial spacing between the outer edges of the cover plate 23 and the outer peripheral wall of the pole core 10 is greater than 4mm, so as to avoid too small a distance between the outer edges of the cover plate 23 and the outer peripheral wall of the pole core 10, avoid too large a diameter of the cover plate 23, and further ensure that the cover plate 23 and the pole core 10 can be separated by the insulating spacer 22, and ensure the insulating capability of the insulating spacer 22 on the cover plate 23 and the current collecting disc 21.

In some embodiments, the cover plate 23 is formed in a disc shape, and the cover plate 23 is coaxially disposed with the pole core 10, where radial distances between outer edges of different positions of the cover plate 23 and the outer peripheral wall of the pole core 10 are equal, and the radial distance between the cover plate 23 and the outer peripheral wall of the pole core 10 is d1.

In some embodiments of the present utility model, as shown in fig. 4, the other end of the pole core 10 in the first direction is provided with the second tab 12, the first tab 11 and the second tab 12 are provided at both ends of the pole core 10 in the first direction, the second end surface 14 of the pole core 10 provided with the second tab 12 is provided with an annular welding region 141, and the heat-shrinkable insulating film 30 covers a portion of the second end surface 14 and exposes the welding region 141 to enable avoidance of the welding region 141 while protecting a portion of the second end surface 14, thereby enabling welding of the second end surface 14 and other components through the welding region 141.

In some alternative embodiments of the present utility model, as shown in fig. 2 and 4, the pole core 10 is formed into a cylindrical shape, the minimum value of the radial distance between the outer edge of the welding area 141 and the outer peripheral wall of the pole core 10 is d2, the radius of the pole core 10 is R, and the value range of d2 is 4mm < d2 < R, so that the size of the welding area 141 can be controlled, the welding of other components and the welding area 141 can be conveniently realized, and the welding connection of the pole core 10 and other components can be conveniently realized.

Specifically, the radial distance between the outer edge of the welding region 141 and the outer circumferential wall of the pole core 10 at different positions may be different, so that the minimum value of the radial distance between the outer edge of the welding region 141 and the outer circumferential wall of the pole core 10 is greater than 4mm, so that the size of the welding region 141 can be sufficiently controlled, and the effect of coating the pole core 10 by the heat-shrinkable insulating film 30 is prevented from being affected by the excessively large welding region 141.

In some embodiments, the welding region 141 is formed in a circular ring shape, the welding region 141 is disposed coaxially with the pole core 10, and the radial distance between the welding region 141 and the outer circumferential wall of the pole core 10 at different positions is the same, and the radial distance between the welding region 141 and the outer circumferential wall of the pole core 10 is d2.

In some embodiments, as shown in fig. 2, 4, 6 and 10, the minimum value of the radial distance between the outer edge of the cover plate 23 and the outer circumferential wall of the pole core 10 is d1, the distance between the first end face 13 of the pole core 10 provided with the first tab 11 and the surface of the insulating spacer 22 facing away from the collecting tray 21 is w, the radial length of the area of the insulating spacer 22 covered by the heat-shrinkable insulating film 30 is x1, the second end face 14 of the pole core 10 provided with the second tab 12 is provided with an annular welding area 141, the minimum value of the radial distance between the welding area 141 and the outer circumferential wall of the pole core 10 is d2, the length of the heat-shrinkable insulating film 30 is h1, and the length of the pole core 10 is h2.

The value range of h1 is w+x1 < h1 and is less than or equal to h2+d1+d2, namely the length h1 of the heat-shrinkable insulating film 30 is larger than the sum of the distance w between the first end face 13 of the pole core 10 provided with the first pole lug 11 and the surface of the insulating spacer 22, which is far away from the current collecting disc 21, and the radial length x1 of the area of the insulating spacer 22 covered by the heat-shrinkable insulating film 30, so that the heat-shrinkable insulating film 30 can well isolate the first end face 13 and the shell of the pole core 10 provided with the first pole lug 11, and the first pole lug 11 is prevented from being contacted with the shell; the length h1 of the heat-shrinkable insulating film 30 is smaller than or equal to the sum of the length h2 of the pole core 10, the minimum value d1 of the radial distance between the outer edge of the cover plate 23 and the outer peripheral wall of the pole core 10, and the minimum value d2 of the radial distance between the welding area 141 and the outer peripheral wall of the pole core 10, so that the length of the heat-shrinkable insulating film 30 is prevented from being excessively long, and the cover plate 23 and the welding area 141 can be exposed to the heat-shrinkable insulating film 30, and the welding cooperation of the cover plate 23 and the welding area 141 with other parts is prevented from being influenced; and the thermal shrinkage insulating film 30 is utilized to protect the pole core 10, and meanwhile, the structural strength of the thermal shrinkage insulating film 30 is ensured, so that the thermal shrinkage insulating film 30 is prevented from being deformed easily.

Specifically, when the heat-shrinkable insulating film 30 is heated to its own glass transition temperature to stretch the heat-shrinkable insulating film 30, the stretched length can be selected according to the value range of h1 to meet the actual assembly requirement, and meanwhile, the length of the heat-shrinkable insulating film 30 can be adjusted in a larger range, so that the cost is reduced, and the coating efficiency of the heat-shrinkable insulating film 30 is improved.

In some embodiments, the radial length of the region covered by the heat-shrinkable insulating film 30 is x1, the minimum value of the radial distance between the outer edge of the cover plate 23 and the outer peripheral wall of the pole core 10 is d1,0 < x1 < d1, so as to avoid that the heat-shrinkable insulating film 30 will contact with the cover plate 23 or cover the cover plate 23, specifically, the periphery of the cover plate 23 is in welding fit with the outer shell of the battery cell, so that a certain distance is kept between the heat-shrinkable insulating film 30 and the cover plate 23, and the welding of the cover plate 23 and the outer shell of the battery cell will be prevented from being influenced by the heat-shrinkable insulating film 30.

In some embodiments, the radial length of the region of the second end surface 14 covered by the heat-shrinkable insulating film 30 is x2, the minimum value of the radial distance between the outer edge of the welding region 141 and the outer peripheral wall of the pole core 10 is d2,0 < x2 < d2, so as to avoid that the heat-shrinkable insulating film 30 contacts with the welding region 141 or covers the welding region 141, specifically, the welding region 141 is in welding fit with the outer case or the bottom cover of the battery cell, so that a certain distance is kept between the heat-shrinkable insulating film 30 and the welding region 141, so as to avoid that the welding of the welding region 141 and the outer case or the bottom cover of the battery cell is influenced by the heat-shrinkable insulating film 30.

The battery cell according to the embodiment of the present utility model is described below. The battery cell according to the embodiment of the present utility model includes a case and the pole core assembly 1 according to the above-described embodiment of the present utility model.

The pole core 10 is arranged in the shell, the cover plate assembly 20 covers the end opening of the shell, on one hand, the pole core 10 in the shell is convenient to protect, and on the other hand, the pole core 10 can be electrically connected with external components through the cover plate assembly 20.

In some embodiments, the second tab 12 of the pole piece 10 is electrically connected to the housing to enable docking of the second tab 12 with external components through the housing, thereby enabling discharging or charging of the cells.

In some embodiments of the present utility model, as shown in fig. 8 and 9, the cover plate assembly 20 further includes a conductive post 24, a metal connector 25 and a cover plate 23, the conductive post 24 extends along a first direction, the conductive post 24 has a fixed end 241 and an electrical connection end 242 in the first direction, the current collecting plate 21 is electrically connected with the electrical connection end 242, the metal connector 25, the cover plate 23 and the insulating spacer 22 are sequentially sleeved on the conductive post 24 in the first direction, the cover plate 23 is fixed to the housing, a first insulating member 26 is disposed between the metal connector 25 and the cover plate 23, the cover plate 23 and the current collecting plate 21 are separated in an insulating manner by the insulating spacer 22, a sealing member 27 is disposed between the cover plate 23 and the conductive post 24, and the fixed end 241 is fixedly connected with the metal connector 25 to fixedly connect the conductive post 24 and the metal connector 25 together.

In some embodiments, the fixed end 241 of the conductive post 24 is adapted to be compressively deformed such that at least a portion of the fixed end 241 is located on a side of the metal connector 25 facing away from the current collecting plate 21 so as to facilitate contact of the fixed end 241 with the metal connector 25 and thereby facilitate a fixed connection of the fixed end 241 with the metal connector 25.

Thereby, convenient assembly of the cover plate assembly 20 can be realized, the surface flatness and cylindricity of the conductive column 24 are improved, and the overall performance of the cover plate assembly 20 is improved.

For example, as shown in fig. 8 to 9, the cap plate assembly 20 includes a conductive post 24 and a current collecting plate 21, the conductive post 24 extending in a first direction in which both ends of the conductive post 24 are formed as a fixed end 241 and an electrical connection end 242, respectively. The current collecting plate 21 is located at the lower side of the conductive post 24 and is electrically connected with the electrical connection end 242, and the current collecting plate 21 is used for being electrically connected with the first tab 11 of the pole core 10, so that the pole core 10 can be electrically connected with the conductive post 24 through the first tab 11 and the current collecting plate 21.

The cover plate assembly 20 further includes a metal connecting member 25, a cover plate 23 and an insulating spacer 22, wherein the metal connecting member 25, the cover plate 23 and the insulating spacer 22 are all configured in a ring shape, and the metal connecting member 25, the cover plate 23 and the insulating spacer 22 are sequentially sleeved outside the conductive column 24 in a direction approaching the current collecting plate 21 in the first direction.

The metal connecting piece 25 is used for being electrically connected with the conductive post 24, and the side wall of the metal connecting piece 25 facing away from the current collecting disc 21 is formed into an electrical connection surface, so that the conductive post 24 can be powered outwards through the electrical connection surface, and the overall resistance of the conductive loop can be reduced. Preferably, the material of the metal connector 25 may be aluminum.

Wherein, be equipped with first insulating part 26 between metal connecting piece 25 and the apron 23, first insulating part 26 is constructed to the annular structure that the diameter is greater than metal connecting piece 25, and one side that first insulating part 26 deviates from apron 23 is formed with the holding tank, and the lower extreme of metal connecting piece 25 can stretch to the holding tank for first insulating part 26 can be with apron 23 and metal connecting piece 25 insulation separation, in order to avoid metal connecting piece 25 and apron 23 electricity to be connected.

Meanwhile, the insulating spacer 22 may be provided to have a diameter larger than that of the current collecting plate 21 such that the insulating spacer 22 may insulate the cap plate 23 from the current collecting plate 21 to avoid the current collecting plate 21 from being electrically connected to the cap plate 23, and a sealing member 27 may be provided between the cap plate 23 and the conductive column 24, the sealing member 27 being for insulating the conductive column 24 from the cap plate 23 to avoid the conductive column 24 from being electrically connected to the cap plate 23. In this way, the cover plate 23 can be prevented from being electrically connected to the pole core 10 to prevent a short circuit.

Wherein a stepped groove may be formed at a side of the metal connection member 25 facing away from the current collecting plate 21, the stepped groove being disposed around the conductive post 24. After the metal connecting piece 25 is sleeved on the outer side of the conductive post 24, the fixed end 241 of the conductive post 24 can be extruded, so that the fixed end 241 is pressed and deformed, and at least one part of the fixed end 241 can extend into the step groove and be in contact with the metal connecting piece 25. The fixed end 241 is riveted with the metal connection member 25 to apply a downward force to the metal connection member 25, and the metal connection member 25, the first insulating member 26, the cover plate 23, the sealing member 27 and the insulating spacer 22 are compressed, so that the assembly of the cover plate assembly 20 is realized, the contact area between the conductive post 24 and the metal connection member 25 can be increased, and the resistance of the conductive path can be reduced. Thereby, the surface flatness and cylindricity of the conductive posts 24 are improved, and the reliability of the cap plate assembly 20 is improved.

In some embodiments, the metal connecting piece 25 and the conductive post 24 are formed in a split manner, and the metal connecting piece 25 is sleeved on the conductive post 24, so that the conductive post 24 can rivet and limit the metal connecting piece 25, thereby realizing the assembly of the cover plate assembly 20, reducing the assembly difficulty of the cover plate assembly 20, improving the surface flatness and cylindricity of the conductive post 24, and improving the reliability of the cover plate assembly 20.

In some embodiments, the end of the housing has an opening through which a portion of the cover assembly 20 passes, and the step at the rim of the cover 23 is welded to the inner wall of the opening to secure the cover 23 to the housing and thereby mount the cover assembly 20 to the housing.

According to the battery cell according to the embodiment of the present utility model, by using the pole core assembly 1 according to the above embodiment of the present utility model, the thermal shrinkage insulating film 30 is coated on the pole core 10 and the current collecting plate 21 to perform insulation protection on the outer circumferential wall of the pole core 10 and the current collecting plate 21, so that the outer circumferential wall of the pole core 10 and the current collecting plate 21 are prevented from being electrically connected with the outer casing of the battery cell, short circuit is prevented from being caused, coating is stable, and protection capability is strong.

A battery pack according to an embodiment of the present utility model is described below. The battery pack according to the embodiment of the present utility model includes the battery cells according to the above-described embodiment of the present utility model.

According to the battery pack of the embodiment of the utility model, the battery cells according to the embodiment of the utility model are utilized, the heat-shrinkable insulating film 30 is coated on the pole core 10 and the current collecting disc 21, so that the outer peripheral wall of the pole core 10 and the current collecting disc 21 are insulated and protected, the coating is stable, the protection capability is strong, the outer peripheral wall of the pole core 10 and the current collecting disc 21 are prevented from being electrically connected with the outer shell of the battery cell, short circuits are avoided, and meanwhile, the heat-shrinkable insulating film 30 can be arranged on the pole core 10 without other fixing structures, so that the complexity of a process is reduced, and the production cost is reduced.

A vehicle according to an embodiment of the present utility model is described below. The vehicle according to the embodiment of the utility model includes the battery pack according to the above-described embodiment of the utility model.

According to the vehicle of the embodiment of the utility model, by using the battery pack according to the above embodiment of the utility model, the heat-shrinkable insulating film 30 is coated on the pole core 10 and the current collecting plate 21 to perform insulation protection on the outer peripheral wall of the pole core 10 and the current collecting plate 21, so that the outer peripheral wall of the pole core 10 and the current collecting plate 21 are prevented from being electrically connected with the outer shell of the battery cell, short circuit is prevented from being caused, the coating is stable, the protection capability is strong, and meanwhile, the heat-shrinkable insulating film 30 can be arranged on the pole core 10 without other fixing structures, so that the complexity of the process is reduced, and the production cost is reduced.

Other components and operations of a vehicle according to embodiments of the utility model are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more. In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (12)

1. A pole piece assembly (1), characterized by comprising:

a pole core (10), wherein one end of the pole core (10) in a first direction is provided with a first pole lug (11);

the cover plate assembly (20), the end of the pole core (10) is arranged on the cover plate assembly (20), the cover plate assembly (20) comprises a current collecting disc (21) and an insulating spacer ring (22), the current collecting disc (21) is electrically connected with the first pole lug (11), and the insulating spacer ring (22) is arranged on one side, deviating from the first pole lug (11), of the current collecting disc (21);

and a heat-shrinkable insulating film (30), wherein the heat-shrinkable insulating film (30) is coated on at least a part of the outer peripheral wall of the pole core (10) and a part of the insulating spacer (22).

2. The pole core assembly (1) according to claim 1, wherein the insulating spacer ring (22) is provided with a plurality of avoidance areas (221), the current collecting disc (21) is provided with a plurality of connection areas (211), each connection area (211) is welded with the first pole lug (11), the plurality of avoidance areas (221) are arranged opposite to the plurality of connection areas (211) one by one, and the heat-shrinkable insulating film (30) is located on the outer sides of the plurality of avoidance areas (221) so that the plurality of avoidance areas (221) are exposed.

3. The pole core assembly (1) according to claim 1, wherein the cover plate assembly (20) further comprises a cover plate (23), the cover plate (23) is arranged on the side of the insulating spacer ring (22) facing away from the current collecting plate (21), and the cover plate (23) is exposed to the heat-shrinkable insulating film (30).

4. A pole core assembly (1) according to claim 3, wherein the pole core (10) is formed in a cylindrical shape, the minimum value of the radial distance between the outer edge of the cover plate (23) and the outer peripheral wall of the pole core (10) is d1, the radius of the pole core (10) is R, and the value range of d1 is 4mm < d1 < R.

5. Pole core assembly (1) according to any of claims 1-4, characterized in that the pole core (10) is provided with a second pole lug (12) at the other end of the first direction, that the second end face (14) provided with the second pole lug (12) is provided with an annular welding area (141), that the heat shrink insulating film (30) covers a part of the second end face (14) and that the welding area (141) is exposed.

6. The pole core assembly (1) according to claim 5, wherein the pole core (10) is formed in a cylindrical shape, the minimum value of the radial distance between the outer edge of the welding area (141) and the outer peripheral wall of the pole core (10) is d2, the radius of the pole core (10) is R, and the value range of d2 is 4mm < d2 < R.

7. Pole core assembly (1) according to claim 6, characterized in that the minimum value of the radial spacing between the outer edge of the cover plate (23) and the outer circumferential wall of the pole core (10) is d1, the spacing between the first end face (13) of the pole core (10) provided with the first pole lug (11) and the surface of the insulating spacer (22) facing away from the collecting disc (21) is w, the radial length of the region of the insulating spacer (22) covered by the heat shrink insulating film (30) is x1;

the minimum value of the radial distance between the welding area (141) and the outer peripheral wall of the pole core (10) is d2, the length of the heat-shrinkable insulating film (30) is h1, the length of the pole core (10) is h2, and the value range of h1 is w+x1 < h1 less than or equal to h2+d1+d2.

8. A battery cell, comprising:

a housing;

-a pole core assembly (1), the pole core assembly (1) being a pole core assembly (1) according to any one of claims 1-7, the pole core being provided within the housing, the cover plate assembly closing an end opening of the housing.

9. The battery cell of claim 8, wherein the cover assembly (20) further comprises:

-a conductive post (24), the conductive post (24) extending along the first direction, in which first direction the conductive post (24) has a fixed end (241) and an electrical connection end (242), the current collecting plate (21) being electrically connected with the electrical connection end (242);

metal connecting piece (25) and apron (23) in the first direction metal connecting piece (25) apron (23) with insulating spacer (22) overcoat in proper order in electrically conductive post (24), apron (23) are fixed to the shell, metal connecting piece (25) with be equipped with first insulating piece (26) between apron (23), apron (23) with pass through between current collecting tray (21) insulating separation of insulating spacer (22), apron (23) with be equipped with sealing member (27) between electrically conductive post (24), stiff end (241) with metal connecting piece (25) fixed connection.

10. The battery cell according to claim 9, wherein the end of the housing has an opening through which a portion of the cover assembly (20) passes, and the step of the rim of the cover (23) is welded to the inner wall of the opening.

11. A battery pack comprising a plurality of battery cells, the battery cells being according to any one of claims 8-10.

12. A vehicle comprising the battery pack according to claim 11.