CN219843057U - Cover plate assembly for battery, battery module, battery pack and vehicle - Google Patents

Abstract

The utility model discloses a cover plate component for a battery, the battery, a battery module, a battery pack and a vehicle, wherein the cover plate component comprises: cover plate, post terminal and insulating ring. The cover plate is provided with a mounting hole, the pole terminal is arranged in the mounting hole, the insulating sleeve is arranged between the cover plate and the pole terminal, the insulating ring is sleeved outside the pole terminal, the inner wall of the insulating ring is provided with at least one positioning bulge, and the positioning bulge covers a part of the wall surface of the inner peripheral wall of the insulating ring. From this, realized that insulating ring and installation Kong Duiji post terminal's axiality is fixed, can prevent effectively that the post terminal from rocking in the mounting hole, improve battery cover plate stability, and the bellied clearance that sets up of location can increase between insulating ring inner wall and the post terminal, effectively reduce insulation resistance that leads to because the solder switches on and slightly and low pressure corrosion probability, improve the life of apron subassembly.

Description

Cover plate assembly for battery, battery module, battery pack and vehicle

Technical Field

The utility model relates to the technical field of batteries, in particular to a cover plate assembly for a battery, the battery, a battery module, a battery pack and a vehicle.

Background

In the prior art, the cover plate component is generally formed by connecting an insulating ring, a pole terminal and a disc together through brazing, so that a closed space is formed, the insulating ring plays an insulating role between the pole terminal and the disc, but the coaxiality of the insulating ring and the pole terminal needs to be ensured when the insulating ring is brazed, and a small gap is formed between the insulating ring and the pole terminal. When the insulating ring is brazed with the disc, the brazing filler metal flows along the insulating ring when the brazing filler metal is wetted in a furnace, part of the brazing filler metal can infiltrate into the inner edge of the insulating ring, when the gap between the insulating ring and the pole terminal is small or is in contact, the brazing filler metal is used as a conductor, the insulation resistance between the pole terminal and the cover plate is reduced, the cover plate is easy to lower voltage, and then the cover plate and the explosion-proof valve are corroded under low voltage.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, a first object of the present utility model is to provide a cover plate assembly for a battery, which can prevent the occurrence of insulation resistance from being reduced and low-voltage corrosion caused by the conduction of solder, and improve the service life of the cover plate assembly for a battery.

A second object of the present utility model is to provide a battery including the cover plate assembly described in the above embodiments.

A third object of the present utility model is to provide a battery module including the battery described in the above embodiments.

A fourth object of the present utility model is to provide a battery pack including the battery module or the battery described in the above embodiments.

A fifth object of the present utility model is to provide a vehicle including the battery pack described in the above embodiment.

According to an embodiment of the first aspect of the present utility model, a cap plate assembly for a battery includes: cover plate, post terminal and insulating ring. The cover plate is provided with a mounting hole, the pole terminal is arranged in the mounting hole, the insulating ring is arranged between the cover plate and the pole terminal, the insulating ring is sleeved outside the pole terminal, the inner peripheral wall of the insulating ring is provided with at least one positioning protrusion, and the positioning protrusion covers part of the wall surface of the inner peripheral wall of the insulating ring.

According to the cover plate assembly for the battery, the positioning protrusions are arranged on the inner peripheral wall of the insulating ring, so that the cover plate assembly can be used for positioning coaxiality of the insulating ring and the pole terminal, and also can increase a gap between the insulating ring and the pole terminal, eliminate insulation resistance small and low-voltage corrosion caused by conduction of brazing filler metal, and improve stability of the cover plate assembly of the battery.

In some embodiments, the positioning protrusions are a plurality of, and the positioning protrusions are arranged between the insulating ring and the pole terminal and are arranged outside the pole terminal at intervals along the circumferential direction of the pole terminal.

In some embodiments, the inner wall of the insulating ring includes two first side walls and two second side walls, the two first side walls are opposite to each other along the length direction of the cover plate, the two second side walls are respectively connected between two ends of the two first side walls, and the plurality of positioning protrusions include: a plurality of first positioning projections and a plurality of second positioning projections. The first positioning protrusions are respectively arranged on the two first side walls, and the second positioning protrusions are respectively arranged on the two second side walls.

In some embodiments, the first positioning projections are two and the second positioning projections are four; the two first positioning protrusions are respectively positioned in the middle of the two first side walls; and each second side wall is provided with two second positioning protrusions, and the two second positioning protrusions of each second side wall are respectively positioned at two ends of the corresponding second side wall along the length direction of the cover plate.

In some embodiments, the locating boss extends in an axial direction of the post terminal; at least one of the two ends of the positioning protrusion along the axial direction of the pole terminal is flush with the corresponding end surface of the insulating ring along the axial direction of the pole terminal; or two ends of the positioning bulge along the axial direction of the pole terminal are respectively positioned at one side, adjacent to the center of the insulating ring, of the corresponding end surface of the insulating ring along the axial direction of the pole terminal.

In some embodiments, the locating protrusion extends along a circumferential direction of the post terminal.

In some embodiments, the positioning protrusion is disposed at a radial interval from the post terminal.

In some embodiments, a minimum spacing between a side surface of the positioning protrusion facing the post terminal and an outer peripheral wall of the post terminal is L, the L satisfying: l is more than or equal to 0.05mm and less than or equal to 0.2mm.

In some embodiments, a minimum spacing between an inner peripheral wall of the insulating ring, excluding the positioning protrusion, and an outer peripheral wall of the post terminal is H, the H satisfying: h is more than or equal to 0.5mm and less than or equal to 3mm.

In some embodiments, further comprising: the disc is sleeved outside the pole terminal and positioned in the mounting hole, and the insulating ring is positioned on one side of the disc, which is far away from the cover plate, along the thickness direction of the cover plate.

In some embodiments, further comprising: and an insulator provided between an outer peripheral wall of the post terminal and an inner peripheral wall of the disk.

A battery according to an embodiment of the second aspect of the present utility model includes a cap plate assembly for a battery according to the above-described embodiment of the first aspect of the present utility model.

A battery module according to an embodiment of a third aspect of the present utility model includes a battery according to the embodiment of the above second aspect of the present utility model.

A battery pack according to an embodiment of a fourth aspect of the present utility model includes a battery according to the embodiment of the above second aspect of the present utility model or a battery module according to the embodiment of the above third aspect of the present utility model.

A vehicle according to an embodiment of a fifth aspect of the present utility model includes a battery pack according to the above-described fourth aspect of the present utility model.

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 an exploded view of a cap plate assembly for a battery according to an embodiment of the present utility model.

Fig. 2 is a schematic cross-sectional view of a cap plate assembly for a battery according to an embodiment of the present utility model.

Fig. 3 is an assembly external view of a cap assembly for a battery according to an embodiment of the present utility model.

Fig. 4 is a schematic view of a post terminal according to an embodiment of the present utility model.

Fig. 5 is a schematic view of an insulating ring according to an embodiment of the present utility model.

FIG. 6 is a schematic diagram of a disc according to an embodiment of the present utility model.

Fig. 7 is a schematic cross-sectional view of a post terminal and an insulating ring according to an embodiment of the present utility model.

Fig. 8 is an enlarged schematic view of the region P in fig. 7.

Fig. 9 is a schematic view of another version of an insulating ring according to an embodiment of the present utility model.

Reference numerals:

1. a cover plate assembly;

10. a cover plate;

20. a post terminal;

30. an insulating ring;

40. a mounting hole; 41. a first sidewall; 42. a second sidewall;

50. positioning the bulge; 51. A first positioning protrusion; 52. A second positioning protrusion;

60. a disc; 61. A first mating portion; 62. A second mating portion;

70. an insulating member;

A. a thickness direction; B. a length direction; C. in the width direction.

Detailed Description

Embodiments of the present utility model will be described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary, and a cap plate assembly 1 for a battery according to an embodiment of the present utility model will be described below with reference to fig. 1 to 9, the cap plate assembly 1 including a cap plate 10, a post terminal 20, and an insulating ring 30. The cover assembly 1 has a thickness direction a, a length direction B, and a width direction C.

Specifically, as shown in fig. 1 to 3, the cover plate 10 is provided with a mounting hole 40 for placing the post terminal 20 and the insulating ring 30, the post terminal 20 is disposed in the mounting hole 40, the insulating ring 30 is disposed between the cover plate 10 and the post terminal 20, the insulating ring 30 is sleeved outside the post terminal 20, the inner peripheral wall of the insulating ring 30 is provided with at least one positioning protrusion 50, and the positioning protrusion 50 covers a part of the wall surface of the inner peripheral wall of the insulating ring 30.

Referring to fig. 1, 2 and 5, two surfaces of the cover plate 10 in the thickness direction a are a first surface and a second surface, the mounting hole 40 penetrates through the first surface and the second surface, the post terminal 20 is sleeved in the mounting hole 40 from a side of the cover plate 10 where the first surface is located, and the mounting hole 40 is circular or elliptical. The positioning protrusion 50 is provided on the inner peripheral wall of the insulating ring 30 and is coaxially disposed with the post terminal 20 so that the coaxiality of the assembly can be ensured between the insulating ring 30 and the post terminal 20 at the time of the assembly. The positioning boss 50 covers a part of the wall surface of the inner peripheral wall of the insulating ring 30 means that: the positioning projection 50 is provided on the inner peripheral wall of the insulating ring 30 so as to project from the inner peripheral wall, and the orthographic projection formed on the inner peripheral wall is located within the orthographic projection of the inner peripheral wall of the insulating ring 30. The insulating ring 30 can reduce the possibility that the insulating ring 30 contacts the post terminal 20 by providing the positioning protrusion 50 on the inner circumferential wall, after the cover plate 10, the post terminal 20 and the insulating ring 30 are assembled, one side of the insulating ring 30 adjacent to the first surface of the cover plate 10 is welded with the post terminal 20 through solder, as the solder is melted when encountering high temperature and flows from the first surface to the inner circumferential wall, the positioning protrusion 50 can reduce the possibility that the solder connects the inner circumferential wall and the post terminal 20, and the cover plate 10 is prevented from being corroded due to low voltage caused by the electric connection of the solder between the post terminal 20 and the cover plate 10. The insulating ring 30 is a ceramic member.

According to the cover plate assembly 1 provided by the embodiment of the utility model, the positioning protrusion 50 is arranged on the inner peripheral wall of the insulating ring 30, so that the coaxiality of assembly between the insulating ring 30 and the pole terminal 20 is ensured, the assembly reliability of the cover plate assembly 1 is improved, the pole terminal 20 is prevented from shaking in the mounting hole 40, the interval between the inner peripheral wall of the insulating ring 30 and the pole terminal 20 is increased, the possibility that the solder flowing during solder welding flows to the pole terminal 20 and the cover plate 10 through the inner peripheral wall of the insulating ring 30 to conduct the pole terminal 20 and the cover plate 10 is reduced, the probability that the insulation resistance between the insulating ring 30 and the cover plate 10 is smaller or conducted is greatly reduced, the cover plate 10 is corroded by low pressure, and the service life of the cover plate assembly 1 is prolonged.

According to some embodiments of the present utility model, as shown in fig. 1 and 5, the positioning protrusions 50 are plural, the positioning protrusions 50 are disposed between the insulating ring 30 and the post terminal 20, and the positioning protrusions 50 are disposed outside the post terminal 20 at intervals along the circumferential direction of the post terminal 20. The plurality of positioning projections 50 are provided at intervals on the inner peripheral wall of the insulating ring 30 in the circumferential direction of the post terminal 20, and each positioning projection 50 extends in the axial direction of the post terminal 20. That is, a space is formed between every two positioning protrusions 50, and when the post terminal 20 is sleeved in the insulating ring 30, a plurality of gaps are formed between the insulating ring 30, the positioning protrusions 50 and the post terminal 20. When the insulating ring 30 is soldered to the post terminal 20, a plurality of gaps formed between the insulating ring 30 and the post terminal 20 can be used to accommodate excessive solder flow, preventing a decrease in insulation resistance between the post terminal 20 and the cap plate 10 due to solder flow to pass through the post terminal 20 and the cap plate 10. From this, through set up a plurality of location protruding 50 in insulating ring 30, guarantee the axiality of utmost point post terminal 20 and insulating ring 30 assembly on a plurality of directions, increase the clearance between insulating ring 30 inner wall and the utmost point post terminal 20, reduce because solder conduction causes insulation resistance to be less and low pressure corrosion probability, solder conduction probability effectively reduces, promotes the stability and the security of apron subassembly 1, further prolongs the life of battery.

According to some embodiments of the present utility model, as shown in fig. 5, the inner wall of the insulating ring 30 includes two first side walls 41 and two second side walls 42, the two first side walls 41 are opposite to each other along the length direction B of the cap plate 10, and the two second side walls 42 are respectively connected between both ends of the two first side walls 41. The plurality of positioning projections 50 includes: a plurality of first positioning projections 51 and a plurality of second positioning projections 52. The first positioning projections 51 are respectively provided on the two first side walls 41, and the second positioning projections 52 are respectively provided on the two second side walls 42. The first side wall 41 is an arc section, the second side wall 42 is a straight line section, the two second side walls 42 are respectively connected to two ends of the two arc sections, the first positioning protrusions 51 are arranged on the first side wall 41, the second positioning protrusions 52 are arranged on the second side wall 42, and the number of the first positioning protrusions 51 and the number of the second positioning protrusions 52 are specifically set according to a use scene.

Thus, the positioning protrusions 50 are uniformly distributed on the first side wall 41 and the second side wall 42, the first positioning protrusions 51 limit the pole terminal 20 at two ends of the pole terminal 20 along the length direction B of the cover plate 10, and the second positioning protrusions 52 limit the pole terminal 20 at two ends of the pole terminal 20 along the width direction C of the cover plate 10, so that coaxiality of the insulating ring 30 and the pole terminal 20 during assembly can be ensured, stress uniformity of the positioning protrusions 50 can be ensured, uniform interval arrangement between the insulating ring 30 and the inner peripheral wall of the insulating ring 30 in the circumferential direction of the pole terminal 20 can be ensured, and influence of solder flow on the inner peripheral wall on insulating performance between the pole terminal 20 and the cover plate 10 can be reduced.

According to some embodiments of the present utility model, as shown in fig. 5, the number of the first positioning protrusions 51 is two, the number of the second positioning protrusions 52 is four, the two first positioning protrusions 51 are respectively located at the middle parts of the two first side walls 41, two second positioning protrusions 52 are provided on each second side wall 42, and the two second positioning protrusions 52 of each second side wall 42 are respectively located at two ends of the corresponding second side wall 42 along the length direction B of the cover plate 10. The two first positioning protrusions 51 respectively located at the middle parts of the two first side walls 41 are used for preventing the insulating ring 30 from shifting in the length direction B, the four second positioning protrusions 52 respectively located at the two ends of the two second side walls 42 are used for preventing the insulating ring 30 from shifting in the width direction C, and the plurality of positioning protrusions 50 on the inner wall of the insulating ring 30 can ensure the coaxiality of the insulating ring 30 and the post terminal 20. Therefore, the positioning protrusions 50 are arranged on the inner peripheral wall of the insulating ring 30 along the length direction B and the width direction C of the cover plate 10, so that coaxiality of assembly of the insulating ring 30 and the pole terminal 20 is achieved in the circumferential direction of the insulating ring 30, the possibility of deflection of the pole terminal 20 in the width direction C of the cover plate 10 is reduced, the distance between the pole terminal 20 and the insulating ring 30 is ensured, and the risk of low-voltage corrosion of the cover plate 10 caused by small insulation resistance possibly caused by conduction of brazing filler metal is further reduced.

According to some embodiments of the present utility model, as shown in fig. 5 and 7, the positioning protrusion 50 extends in the axial direction of the post terminal 20, and at least one of the two ends of the positioning protrusion 50 in the axial direction of the post terminal 20 is flush with the corresponding end surface of the insulating ring 30 in the axial direction of the post terminal 20. The end surfaces of the plurality of positioning projections 50 provided on the inner peripheral wall along the both ends of the thickness direction a of the cap plate 10 are flush with the both surfaces of the insulating ring 30 along the thickness direction a of the cap plate 10, so that the structural strength of the insulating ring 30 can be increased to make the stability in the thickness direction a of the cap plate 10 higher when the insulating ring 30 and the post terminal 20 are assembled.

Alternatively, as shown in fig. 9, both ends of the positioning protrusion 50 in the axial direction of the post terminal 20 are located on one side of the corresponding end face of the insulating ring 30 in the axial direction of the post terminal 20, respectively, adjacent to the center of the insulating ring 30. That is, the positioning protrusion 50 is located between two surfaces of the insulating ring 30 in the thickness direction a of the cap plate 10, and the orthographic projection of the positioning protrusion 50 in the width direction C of the cap plate 10 is located within the orthographic projection of the second sidewall 42 of the insulating ring 30 in the width direction C of the cap plate 10, and the upper and lower surfaces of the positioning protrusion 50 in the width direction C of the cap plate 10 are not flush with the upper and lower surfaces of the insulating ring 30. The length of the positioning protrusion 50 in the thickness direction a of the cap plate 10 is smaller than the length of the insulating ring 30 in the thickness direction a of the cap plate 10. Therefore, the coaxiality between the pole terminal 20 and the insulating ring 30 can be ensured by the positioning protrusion 50, and meanwhile, the distance between the inner peripheral wall of the insulating ring 30 and the pole terminal 20 is increased, so that the positioning protrusion 50 is prevented from being soaked when the insulating ring 30 and the pole terminal 20 are soldered and the brazing filler metal is melted and soaked on the inner surface of the insulating ring 30. The positioning protrusion 50 is located between two end surfaces of the insulating ring 30, so that solder can be further prevented from flowing to the surface of one side of the positioning protrusion 50, which is close to the post terminal 20, and the phenomenon that the solder conducts the post terminal 20 and the cover plate 10 can be effectively prevented, and the insulating effect of the insulating ring 30 is improved.

According to some alternative embodiments of the present utility model, the positioning protrusion 50 extends along the circumferential direction of the post terminal 20. At this time, the positioning protrusion 50 is located on the inner circumferential wall of the insulating ring 30 and extends on the inner circumferential wall of the insulating ring 30 in the circumferential direction of the post terminal 20, the positioning protrusion 50 is a third positioning protrusion 50, and the third positioning protrusion 50 is a ring-shaped structure. The length of the positioning protrusion 50 in the thickness direction a of the cap plate 10 is smaller than the length of the insulating ring 30 in the thickness direction a of the cap plate 10, and the third positioning protrusion 50 is located on the inner peripheral wall between both end surfaces of the insulating ring 30 in the thickness direction a of the cap plate 10. When the insulating ring 30 is fitted over the post terminal 20, the gap defined between the post terminal 20 and the third positioning protrusion 50 is annular. Optionally, the annular third positioning protrusion 50 includes at least a first sub positioning protrusion 50 and a second sub positioning protrusion 50, and the first sub positioning protrusion 50 and the second sub positioning protrusion 50 are disposed at intervals along the circumferential direction of the pole terminal 20. From this, the location protruding 50 extends along the circumference of utmost point post terminal 20, can guarantee the axiality of installation between insulating ring 30 and the utmost point post terminal 20, when insulating ring 30 and utmost point post terminal 20 braze, can not infiltrate the location protruding 50 when the solder flows on the inner peripheral wall of insulating ring 30, perhaps the probability that the location protruding 50 is infiltrated obtains greatly reducing, can effectively reduce the probability that the solder switched on, prevents to lead to the fact insulation resistance to be less or the emergence of low pressure corrosion phenomenon because the solder switched on.

According to some embodiments of the present utility model, as shown in fig. 7, the positioning protrusion 50 is disposed at a distance from the post terminal 20 in the radial direction of the post terminal 20. The minimum distance between the positioning protrusion 50 and the post terminal 20 is smaller than the minimum distance between the post terminal 20 and the inner peripheral wall of the insulating ring 30. Therefore, the space between the positioning protrusion 50 and the pole terminal 20 is smaller, coaxiality of the pole terminal 20 and the insulating ring 30 can be guaranteed, accurate installation of the pole terminal 20 is facilitated, meanwhile, the contact between the pole terminal 20 and the insulating ring 30 through brazing filler metal is avoided, and the insulating effect of the insulating ring 30 is improved.

According to some embodiments of the present utility model, as shown in fig. 7 and 8, a minimum distance L between a side surface of the positioning protrusion 50 facing the post terminal 20 and an outer circumferential wall of the post terminal 20 is L, L satisfying: l is more than or equal to 0.05mm and less than or equal to 0.2mm. If the minimum distance between the side surface of the positioning protrusion 50 facing the post terminal 20 and the outer circumferential wall of the post terminal 20 is greater than 0.2mm, coaxiality cannot be ensured due to the large distance between the insulating ring 30 and the post terminal 20 during soldering. If the minimum distance between the surface of the positioning protrusion 50 facing the post terminal 20 and the outer circumferential wall of the post terminal 20 is less than 0.05mm, the solder is very easy to conduct the insulating ring 30 and the post terminal 20 when flowing at high temperature due to the small distance during soldering, so that the insulation resistance between the post terminal 20 and the cover plate 10 is small or the conduction causes low-voltage corrosion phenomenon. For example, l=0.1 mm. Therefore, the minimum distance between the positioning protrusion 50 and the outer peripheral wall of the pole terminal 20 is limited, so that the gap between the pole terminal 20 and the positioning protrusion 50 is not too large or too small, the coaxiality of the pole terminal 20 and the insulating ring 30 is ensured, the cover plate assembly 1 is enhanced, the influence of solder welding on the internal insulating performance of the cover plate assembly 1 is reduced, and the service life of the cover plate assembly 1 is further prolonged.

According to some embodiments of the present utility model, as shown in fig. 7 and 8, the minimum spacing between the inner peripheral wall of the insulating ring 30 excluding the positioning protrusion 50 and the outer peripheral wall of the post terminal 20 is H, which satisfies: h is more than or equal to 0.5mm and less than or equal to 3mm. If the minimum distance between the inner circumferential wall of the insulating ring 30 excluding the positioning protrusion 50 and the outer circumferential wall of the post terminal 20 is greater than 3mm, the stability of the fit between the post terminal 20 and the insulating ring 30 is low because the surface area of the positioning protrusion 50 facing the post terminal 20 is small, and the structural strength of the positioning protrusion 50 is low. If the minimum distance between the inner peripheral wall of the insulating ring 30 excluding the positioning protrusion 50 and the outer peripheral wall of the post terminal 20 is less than 0.5mm, the distance between the insulating ring 30 and the post terminal 20 is easily small, and the space for accommodating the solder is small, which results in conduction or weak connection of the solder. For example, h=2mm. Thus, the minimum distance between the inner peripheral wall of the insulating ring 30 except the positioning protrusion 50 and the outer peripheral wall of the post terminal 20 is limited, so that the coaxial matching of the insulating ring 30 and the post terminal 20 can be well ensured, and the phenomena of small insulation resistance and low-voltage corrosion caused by the conduction of the brazing filler metal are eliminated.

According to some embodiments of the present utility model, as shown in fig. 1 and 6, the cover plate assembly 1 further includes: the disc 60, the disc 60 is sleeved outside the post terminal 20 and is located in the mounting hole 40, and the insulating ring 30 is located at one side of the disc 60 away from the cover plate 10 along the thickness direction a of the cover plate 10. The inner peripheral wall of the mounting hole 40 of the cover plate 10 is provided with an extension part, the extension part extends along the circumferential direction of the mounting hole 40, the disc 60 is divided into a first matching part 61 and a second matching part 62, the first matching part 61 and the second matching part 62 are of an integral structure, the oval area formed by the outer Zhou Cewei of the first matching part 61 is larger than the oval area formed by the outer Zhou Cewei of the second matching part 62, namely, the first matching part 61 and the second matching part 62 form steps on the inner peripheral wall. The first engaging portion 61 engages with the extending portion on the mounting hole 40 along a side of the cover plate 10 in the thickness direction a of the cover plate 10, and is located on a side surface of the extending portion adjacent to the insulating ring 30, the second engaging portion 62 abuts against the insulating ring 30 along a side of the cover plate 10 away from the cover plate 10, the disk 60 is sleeved outside the post terminal 20, and the post terminal 20 engages with the insulating ring 30, the disk 60 and the cover plate 10 coaxially in this order from top to bottom along the thickness direction a of the cover plate 10. The disc 60 is brazed to a side surface of the insulating ring 30 adjacent to the cap plate 10 in the thickness direction a of the cap plate 10, and a side surface of the disc 60 remote from the insulating ring 30 in the thickness direction a is connected to the cap plate 10 by laser welding. Therefore, the disc 60 can be welded with the insulating ring 30 and the cover plate 10 respectively, so that the insulating ring 30 is convenient to install, the structural strength of the cover plate assembly 1 is improved, and the gap formed between the insulating ring 30 and the cover plate 10 is convenient to seal.

According to some embodiments of the utility model, as shown in fig. 1, the cover plate assembly 1 further comprises: an insulator 70, the insulator 70 being provided between the outer peripheral wall of the post terminal 20 and the inner peripheral wall of the disk 60. The insulator 70 is sleeved on the post terminal 20 at one side of the insulator ring 30 adjacent to the disk 60, and the disk 60 is sleeved on the insulator 70. Thus, the insulator 70 acts as an insulator between the disk 60 and the post terminal 20, preventing the disk 60 from connecting or contacting the post terminal 20. Meanwhile, the insulator 70 fills the gap between the disc 60 and the pole terminal 20, plays a role in protecting and fixing the pole terminal 20, enhances the tightness of the cover plate assembly 1 of the battery, and further improves the service life and safety of the battery.

The battery according to the second aspect of the embodiment of the present utility model includes the cap plate assembly 1 for a battery of the above-described embodiment. As shown in fig. 1, the post terminal 20 further includes a nickel plate, which is disposed at an end of the post terminal 20 away from the cover plate 10, and the nickel plate can increase the structural strength of the end of the post terminal 20 away from the cover plate 10. In the process of installing the cover plate assembly 1, the nickel sheet is assembled with the pole terminal 20, the insulating ring 30, the disc 60 and the insulating piece 70 firstly, then is arranged in the installation hole 40 of the cover plate 10, an electric connecting piece is arranged on one side of the installation plate, far away from the insulating ring 30, and the pole terminal 20 is matched with the electric connecting piece after penetrating through the installation hole 40 to realize the installation of the pole terminal 20 and the cover plate 10. And a sealing member is further arranged between the insulating member 70 and the cover plate 10 and used for sealing a gap between the cover plate 10 and the pole terminal 20, so that the corrosion of the pole terminal 20 caused by the outflow of electrolyte in the battery from the gap is avoided, and the service life of the cover plate assembly 1 is prolonged. The battery also comprises a battery core and a shell, the cover plate assembly 1 and the shell define an installation cavity, the battery core is positioned in the installation cavity, and the free end of the electric connecting piece is abutted against the battery core to conduct the pole terminal 20 and the battery core so as to realize the charging and discharging capacity of the battery. The cover plate 10 is also provided with an explosion-proof valve, so that gas generated when the temperature and the pressure are high in the battery can be timely discharged from the explosion-proof valve, the use safety of the battery is improved, and deflagration is avoided. Wherein the cover plate 10 includes a metal cover plate 10 and an insulating cover plate 10, and the structural strength of the cover plate 10 is increased while the insulation of the cover plate 10 is ensured.

According to the battery provided by the embodiment of the utility model, the insulating property of the battery can be improved, the cover plate component 1 of the battery is prevented from being corroded, and the use safety and the service life of the battery are improved.

The battery module according to the embodiment of the third aspect of the present utility model includes the battery in the above-described embodiment.

According to the battery module provided by the embodiment of the utility model, the battery can be used for improving the safety of the battery module.

A battery pack according to a fourth aspect of the present utility model includes the battery of the above embodiment or the battery module of the above embodiment.

According to the battery pack provided by the embodiment of the utility model, the safety of the battery module can be improved through the arrangement of the battery module.

A vehicle according to a fifth aspect of the embodiment of the utility model includes the battery pack of the above-described embodiment.

According to the vehicle provided by the embodiment of the utility model, the safety of the vehicle can be increased, and the cost of the vehicle can be reduced.

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.

In the description of the utility model, a "first feature" or "second feature" may include one or more of such features. In the description of the present utility model, "plurality" means 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 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.

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 (15)

1. A cover assembly for a battery, comprising:

the cover plate is provided with a mounting hole;

the pole terminal is arranged in the mounting hole;

the insulating ring is arranged between the cover plate and the pole terminal, the insulating ring is sleeved outside the pole terminal, at least one positioning protrusion is arranged on the inner peripheral wall of the insulating ring, and the positioning protrusion covers a part of the wall surface of the inner peripheral wall of the insulating ring.

2. The cover plate assembly for a battery according to claim 1, wherein the plurality of positioning projections are provided between the insulating ring and the post terminal at intervals outside the post terminal in a circumferential direction of the post terminal.

3. The cover plate assembly for a battery according to claim 2, wherein the inner wall of the insulating ring includes two first side walls and two second side walls, the two first side walls being opposite to each other in a length direction of the cover plate, the two second side walls being connected between both ends of the two first side walls, respectively;

the plurality of positioning projections include:

the first positioning protrusions are respectively arranged on the two first side walls;

the second positioning bulges are respectively arranged on the two second side walls.

4. The cover assembly for a battery of claim 3, wherein the first positioning protrusions are two and the second positioning protrusions are four;

the two first positioning protrusions are respectively positioned in the middle of the two first side walls;

and each second side wall is provided with two second positioning protrusions, and the two second positioning protrusions of each second side wall are respectively positioned at two ends of the corresponding second side wall along the length direction of the cover plate.

5. The cover plate assembly for a battery according to any one of claims 1 to 4, wherein the positioning protrusion extends in an axial direction of the post terminal;

at least one of the two ends of the positioning protrusion along the axial direction of the pole terminal is flush with the corresponding end surface of the insulating ring along the axial direction of the pole terminal; or (b)

The two ends of the positioning protrusion along the axial direction of the pole terminal are respectively positioned at one side of the corresponding end surface of the insulating ring along the axial direction of the pole terminal, which is adjacent to the center of the insulating ring.

6. The cover plate assembly for a battery according to any one of claims 1 to 4, wherein the positioning protrusion extends in a circumferential direction of the post terminal.

7. The cover plate assembly for a battery according to any one of claims 1 to 4, wherein the positioning projections are provided at intervals from the post terminal in a radial direction of the post terminal.

8. The cover plate assembly for a battery according to claim 7, wherein a minimum distance between a side surface of the positioning protrusion facing the post terminal and an outer peripheral wall of the post terminal is L, the L satisfying: l is more than or equal to 0.05mm and less than or equal to 0.2mm.

9. The cap plate assembly for a battery according to any one of claims 1 to 4, wherein a minimum distance between an inner peripheral wall of the insulating ring excluding the positioning protrusion and an outer peripheral wall of the post terminal is H, the H satisfying: h is more than or equal to 0.5mm and less than or equal to 3mm.

10. The cover assembly for a battery according to any one of claims 1 to 4, further comprising: the disc is sleeved outside the pole terminal and positioned in the mounting hole, and the insulating ring is positioned on one side of the disc, which is far away from the cover plate, along the thickness direction of the cover plate.

11. The cover assembly for a battery of claim 10, further comprising: and an insulator provided between an outer peripheral wall of the post terminal and an inner peripheral wall of the disk.

12. A battery comprising the cap plate assembly for a battery according to any one of claims 1 to 11.

13. A battery module comprising the battery according to claim 12.

14. A battery pack comprising the battery according to claim 12 or the battery module according to claim 13.

15. A vehicle comprising the battery pack according to claim 14.