CN220172332U

CN220172332U - Cover plate assembly and battery

Info

Publication number: CN220172332U
Application number: CN202321719939.4U
Authority: CN
Inventors: 王珂; 蒋昕玮
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-07-03
Filing date: 2023-07-03
Publication date: 2023-12-12
Anticipated expiration: 2033-07-03

Abstract

The utility model relates to the technical field of batteries, and provides a cover plate assembly and a battery. The cover plate assembly includes: the cover plate body is provided with a first through hole; the pole assembly comprises a first structural part and a second structural part, and the first structural part is positioned at one side of the cover plate body; the second structure part penetrates through the cover plate body from one side of the first through hole, which is opposite to the second structure part, and at least part of the second structure part extends into the second through hole; the connecting piece is positioned on the same side of the cover plate body as the first structural part, and is arranged on the surface of the second structural part, which is opposite to the cover plate body; the connecting piece and the first structure part are made of the same material and are welded and connected; the material of the connecting piece is different from that of the second structure part, the melting point of the second structure part is different from that of the connecting piece, and the connecting piece is connected with the second structure part through penetration welding. The cover plate assembly can reduce the preparation difficulty by optimizing the structure of the internal composite pole, and can improve the overall structural performance of the cover plate assembly.

Description

Cover plate assembly and battery

Technical Field

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

Background

The polar column in the existing cover plate assembly can be compounded by adopting two materials so as to form a compound polar column and improve the performance of the polar column. However, when welding two materials with different melting points forming a composite pole based on the structural characteristics of the conventional composite pole, there are cases where the two materials cannot be welded effectively, and there are cases where butt welding causes uneven melting of the joint surfaces of the two materials.

Therefore, how to improve the structural performance of the composite pole to improve the structural performance of the cover plate assembly and reduce the manufacturing difficulty of the cover plate assembly is a technical problem to be solved.

Disclosure of Invention

The utility model provides a cover plate assembly and a battery, wherein the cover plate assembly can reduce the preparation difficulty and improve the overall structural performance of the cover plate assembly by optimizing the structure of an internal composite pole.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

according to a first aspect of the present utility model there is provided a cover plate assembly comprising:

the cover plate body is provided with a first through hole;

the pole assembly comprises a first structural part and a second structural part, the first structural part is positioned on one side of the cover plate body, the first structural part is provided with a second through hole, and the second through hole is communicated with the first through hole; the second structure part penetrates through the cover plate body from one side of the first through hole of the cover plate body, which is opposite to the second structure part, and at least part of the second structure part extends into the second through hole of the first structure part; the relative position of the first structural part and the cover plate body is fixed through the second structural part along the extending direction of the second structural part;

the connecting piece and the first structure part are positioned on the same side of the cover plate body, and the connecting piece is arranged on the surface of the second structure part, which is opposite to one side of the cover plate body; the connecting piece and the first structure part are made of the same material and are welded and connected; the connecting piece is different from the second structure part in material, the second structure part is different from the connecting piece in melting point, and the connecting piece is connected with the second structure part through penetration welding.

In the cover plate assembly provided by the utility model, the connecting piece and the first structural part are arranged on the same side of the cover plate body, and part of the second structural part is embedded into the first through hole of the cover plate body and the second through hole of the first structural part. Moreover, the cover plate assembly provided by the utility model is provided with the connecting piece which is connected with the second structural part and is connected with the first structural part which is arranged around the second structural part through the connecting piece.

It should be noted that, the cover plate assembly provided by the utility model is provided with the first structure part surrounding the second structure part, and the connecting piece is arranged on one side of the second structure part, which is opposite to the cover plate assembly, and the first structure part, the second structure part and the connecting piece are matched to form the composite pole. After the composite pole is formed, the connecting piece can be matched with the first structural part to form and cover the structural layer made of the same material on the surface of the second structural part, so that the connecting operation between the composite pole and the external bus piece is facilitated. Meanwhile, in the cover plate assembly provided by the utility model, the connecting piece is independently arranged on the surface of the second structural part, so that the welding operation of the second structural part and the connecting piece with different melting points can be conveniently carried out by penetrating the welding device. When welding, welding energy can increase according to the demand, and along with welding energy increase, connecting piece and/or second structure portion all can keep better form in the welding process, and the metal of two kinds of fusing points of being convenient for carries out fusion welding. This structure setting not only can reduce the welding degree of difficulty, can promote the welding effect of connecting piece and second structure portion moreover.

In addition, the connecting piece provides a welding site between the cover plate component and the external confluence piece, so that the first structural part can relatively reduce the area and save the cost; moreover, as the connecting piece and the second structure part adopt penetration welding, the flatness of the surface of the connecting piece after welding is higher, the connecting effect of the converging piece and the connecting piece can be improved, and the overcurrent capacity between the converging piece and the connecting piece can be improved.

Therefore, the cover plate assembly provided by the utility model can reduce the preparation difficulty and can improve the overall structural performance of the cover plate assembly by optimizing the structure of the inner composite second structural part.

According to a second aspect of the present utility model there is provided a battery comprising a cover assembly as provided in any of the above aspects.

In the battery provided by the utility model, the first structure part surrounds the second structure part, the connecting piece is arranged on one side of the second structure part, which is opposite to the cover plate assembly, and the first structure part, the second structure part and the connecting piece are matched to form the composite pole. After the composite pole is formed, the connecting piece can be matched with the first structural part to form and cover the structural layer made of the same material on the surface of the second structural part, so that the connecting operation between the composite pole and the external bus piece is facilitated. Meanwhile, in the cover plate assembly, the connecting piece is independently arranged on the surface of the second structural part, so that the welding operation of the second structural part and the connecting piece with different melting points can be conveniently carried out by penetrating the welding device. When welding, welding energy can increase according to the demand, and along with welding energy increase, connecting piece and/or second structure portion all can keep better form in the welding process, and the metal of two kinds of fusing points of being convenient for carries out fusion welding. This structure setting not only can reduce the welding degree of difficulty, can promote the welding effect of connecting piece and second structure portion moreover.

Drawings

For a better understanding of the utility model, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present utility model. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views. Wherein:

fig. 1 is a schematic perspective view of a cover plate assembly according to an embodiment of the present utility model;

FIG. 2 is an exploded view of the structure of FIG. 1;

FIG. 3 is a cross-sectional view of the cover plate assembly of FIG. 1 at plane M;

fig. 4 is a cross-sectional view of the cover plate assembly of fig. 1 at plane N.

The reference numerals are explained as follows:

100. a cover plate body; 101. a first through hole; 200. a first structure portion; 201. a second through hole; 300. a second structure portion; 400. a connecting piece; 500. a first insulating member; 600. a second insulating member; 700. and a seal.

Detailed Description

The technical solutions in the exemplary embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present utility model. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present utility model, and it should be understood that various modifications and changes can be made to the example embodiments without departing from the scope of the utility model.

In the description of the present utility model, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present utility model, it should be understood that the terms "upper", "lower", "inner", "outer", and the like in the exemplary embodiments of the present utility model are described in terms of the drawings, and should not be construed as limiting the exemplary embodiments of the present utility model. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

In a first aspect, embodiments of the present utility model provide a cover plate assembly. Fig. 1 is a schematic perspective view of a cover plate assembly according to an embodiment of the present utility model; FIG. 2 is an exploded view of the structure of FIG. 1; FIG. 3 is a cross-sectional view of the cover plate assembly of FIG. 1 at plane M; fig. 4 is a cross-sectional view of the cover plate assembly of fig. 1 at plane N. Referring to the structure shown in fig. 1 to 4, a cover plate assembly provided in an embodiment of the present utility model includes: the cover plate comprises a cover plate body 100, a first structural part 200, a second structural part 300 and a connecting piece 400, wherein the cover plate body 100 is provided with a first through hole 101; the pole assembly comprises a first structure part 200 and a second structure part 300, wherein the first structure part 200 is positioned on one side of the cover plate body 100, the first structure part 200 is provided with a second through hole 201, and the second through hole 201 is communicated with the first through hole 101; the second structure portion 300 penetrates the cover plate body 100 from the first through hole 101 of the cover plate body 100 to the side opposite to the second structure portion 300, and at least part of the second structure portion 300 extends into the second through hole 201 of the first structure portion 200; along the extending direction of the second structural part 300, the relative position of the first structural part 200 and the cover plate body 100 is fixed by the second structural part 300; the connecting piece 400 and the first structure portion 200 are located at the same side of the cover plate body 100, and the connecting piece 400 is arranged on the surface of the second structure portion 300, which is opposite to the cover plate body 100; the connecting piece 400 is made of the same material as the first structure part 200 and is welded and connected; the material of the connecting piece 400 is different from that of the second structural part 300, the melting point of the second structural part 300 is different from that of the connecting piece 400, and the connecting piece 400 and the second structural part 300 are connected by penetration welding.

Specifically, as shown in fig. 4, in the cover assembly provided in the embodiment of the utility model, the connecting piece 400 and the first structural portion 200 are disposed on the same side of the cover body 100, and a part of the second structural portion 300 is embedded into the first through hole 101 of the cover body 100 and the second through hole 201 of the first structural portion 200. Furthermore, the cover assembly provided by the embodiment of the present utility model is provided with the connecting member 400 connected to the second structure portion 300, and the first structure portion 200 disposed around the second structure portion 300 is connected through the connecting member 400.

It should be noted that, in the cover assembly provided in the embodiment of the present utility model, the first structural portion 200 is disposed around the second structural portion 300, and the connecting piece 400 is disposed on a side of the second structural portion 300 facing away from the cover assembly, and the first structural portion 200, the second structural portion 300 and the connecting piece 400 cooperate to form a composite pole. After the composite pole is formed, the connecting piece 400 can be matched with the first structural part 200 to form a structural layer made of the same material and coated on the surface of the second structural part 300, so that the connecting operation between the composite pole and an external bus piece is facilitated.

It is worth noting that, based on the structure of the existing composite polar post, the polar post in the prior art can only adopt a butt seam welding process to weld the polar post and the structure compounded on the surface of the polar post, but the butt seam welding is easy to cause uneven surface melting, the welding energy cannot be increased without limit, the metal selected by the polar post is just changed into a liquid state, the structure compounded on the surface of the polar post may not have a complete shape, the welding operation is inconvenient to implement, and the product yield is affected. In the cover plate assembly provided by the embodiment of the utility model, the connecting piece 400 is independently arranged on the surface of the second structural part 300, so that the welding operation of the second structural part 300 and the connecting piece 400 with different melting points can be conveniently performed by penetrating the welding device. During welding, the welding energy can be increased according to the requirement, and as the welding energy is increased, the connecting piece 400 and/or the second structure part 300 can maintain a better form in the welding process, so that two metals with different melting points can be fused and welded conveniently. This structural arrangement not only can reduce the welding difficulty, but also can promote the welding effect of the connecting member 400 and the second structural portion 300.

It should be understood that penetration welding is a technique that utilizes the high energy density and small spot diameter of a beam to instantaneously heat the surface of a workpiece above the melting point to effect welding. Specifically, the light beam is focused on the surface of the workpiece through the lens, so that the light energy density at the focus of the workpiece reaches or exceeds the welding threshold of the material, and the material is quickly melted and solidified together, thereby realizing welding. Notably, penetration welding also has a unique feature in that the beam is able to form "perforations" in the material, rather than just melt the surface. When the laser beam is perpendicularly irradiated to the surface of the workpiece, the laser beam can pass through the surface, through the material, until reaching the bottom, so that the welding operation of the second structure 300 with the joint 400 can be optimized.

For example, when welding the connection member 400 with the second structure portion 300, the connection member 400 may be placed on top of the second structure portion 300, and then welded using a penetration welding process. It should be appreciated that although the melting points of the connector 400 and the second structure 300 made of different materials have a difference, the welding energy can be greatly increased due to penetration welding, so that the two metals can be fused and welded conveniently.

In addition, it should be noted that, in the cover plate assembly provided by the embodiment of the present utility model, the connecting piece 400 provides a welding site between the cover plate assembly and the external bus member, so that the area of the first structural portion 200 can be relatively reduced, and the cost can be saved; moreover, since the connecting piece 400 and the second structural portion 300 are welded by penetration welding, the flatness of the surface of the connecting piece 400 after welding is high, the connection effect of the bus piece and the connecting piece 400 can be improved, and the overcurrent capacity between the bus piece and the connecting piece can be improved.

Therefore, the cover plate assembly provided by the embodiment of the utility model can reduce the preparation difficulty and improve the integral structural performance of the cover plate assembly by optimizing the structure of the internal composite pole.

In one embodiment, please continue to refer to the structure shown in fig. 1 to 4, along the extending direction of the second structural portion 300, the second structural portion 300 does not exceed a side surface of the first structural portion 200 facing away from the cover body 100, and at least a portion of the connecting member 400 is disposed in the second through hole 201.

Specifically, as shown in fig. 1 to fig. 4, the second structure portion 300 disposed in the second through hole 201 has a distance from the opening of the second through hole 201 opposite to the side of the cover plate body 100, that is, the second structure portion 300 does not completely fill the second through hole 201; at least a portion of the connection member 400 is filled in the second through hole 201.

It should be noted that, in the structural arrangement of this embodiment, on one hand, the holes occupied by the connecting piece 400 alone in the height direction can be reduced to improve the space utilization rate, and on the other hand, the connecting piece 400 and the first structural portion 200 can be conveniently welded and connected to reduce the assembly difficulty.

In a specific embodiment, a side surface of the connecting member 400 facing away from the cover body 100 is flush with a side surface of the first structural portion 200 facing away from the cover body 100.

It should be noted that, the structure in this embodiment is configured such that, when the bus member is connected to the cover assembly, only the connecting member 400 may be connected, or the first structure portion 200 and the connecting member 400 may be connected at the same time, according to the requirement, so as to ensure the connection area between the bus member and the cover assembly.

It should be noted that, when the bus bar connects the first structural portion 200 and the connecting member 400 at the same time, since the flatness of the first structural portion 200 and the connecting member 400 is high at the side facing away from the cover plate body 100, the welding surface of the first structural portion 200 and the welding surface of the connecting member 400 are in the same plane. This structure sets up, can provide the welding locus better for the piece that converges can contact first structural portion 200 and connecting piece 400 steadily, in order to guarantee that the piece that converges is connected with the apron subassembly is effective, guarantees the area that overflows between the two, promotes the overcurrent ability between the two.

In one embodiment, please continue to refer to the structure shown in fig. 1 to 4, the connecting member 400 completely covers a side surface of the second structure portion 300 near the connecting member 400.

It should be noted that, in a specific embodiment, the edge of the connecting member 400 and the edge of the side surface of the second structure portion 300 adjacent to the connecting member 400 are coincident, that is, the two are identical in size; in another specific embodiment, the edge of the connection member 400 exceeds the edge of the second structure portion 300 adjacent to the side surface of the connection member 400, i.e., the area of the connection member 400 is larger than the area of the second structure portion 300 adjacent to the side surface of the connection member 400.

It should be noted that, when the area of the connecting piece 400 is larger, the connecting piece 400 can be ensured to effectively cover the surface of the second structural portion 300, which is close to the connecting piece 400, so as to ensure the connection area between the connecting piece 400 and the second structural portion 300, and meanwhile, since the connecting piece 400 protrudes out of the second structural portion 300 along the peripheral side, part of the connecting piece 400 can be matched with the first structural portion 200 in shape, so as to increase the connection area between the first structural portion 200 and the connecting piece 400, and further ensure the connection strength between the connecting piece 400 and the first structural portion 200.

As shown in fig. 1 and 2, the second structure portion 300 is cylindrical on a side close to the connection member 400, and the connection member 400 is in a circular plate shape; as shown in fig. 4, the second structure portion 300 has a dimension L1 on a side close to the connection member 400 (i.e., a diameter of a cylindrical structure of the second structure portion 300 on the side), and the connection member 400 has a dimension L2 (i.e., a diameter of the connection member 400). It should be noted that, the center of the connecting piece 400 is collinear with the center of the cylindrical structure of the second structural portion 300, and the connecting piece 400 uniformly extends beyond the end of the second structural portion 300 on the periphery to effectively cover the second structural portion 300, so as to improve the connection effect between the connecting piece 400 and the second structural portion 300.

Further, the shape of the connection member 400 is not limited to a circular shape, and may be specifically adjusted according to the shape of the second structure portion 300 covered thereby on the side, and the connection member 400 may be rectangular, for example.

In one embodiment, with continued reference to the structure shown in FIG. 4, the thickness d of the connector 400 is in the range of 0.005-5 mm.

It should be noted that, if the thickness d of the connecting piece 400 is too thick, the connecting piece 400 occupies too much size in the second through hole 201, so that the thickness of the first structural portion 200 needs to be thickened, which further affects the overall size of the battery, affects the layout of the battery in the box, reduces the space utilization, and may cause the phenomenon of cold joint in penetration welding, and affects the welding quality; if the thickness d of the connecting member 400 is too thin, the first structural portion 200 may not effectively cover and connect the second structural portion 300 during welding, which affects the composite effect of the first structural portion 200 and the second structural portion 300, and further may cause the cover assembly to not effectively connect the bus member, reduce the overcurrent capability therebetween, and further may affect the welding strength of the connecting member 400 and the first structural portion 200 and the second structural portion 300, and may affect the connection between the second structural portion 300 and the first structural portion 200.

In the embodiment of the utility model, the thickness d of the connecting piece 400 is 0.05 mm-5 mm, so that the two problems can be effectively balanced, the connecting effect of the connecting piece 400 and the second structure part 300 can be ensured, and the whole thickness dimension of the cover plate assembly can be ensured to be proper.

Preferably, the thickness d of the connector 400 may be further reduced in the range of 0.1mm to 2mm to improve structural performance. For example, when the thickness d of the connection member 400 is specifically set, the thickness d of the connection member 400 may be one of the following values.

0.1mm、0.2mm、0.3mm、0.4mm、0.5mm、0.6mm、0.7mm、0.8mm、0.9mm、1.0mm、1.1mm、1.2mm、1.3mm、1.4mm、1.5mm、1.6mm、1.7mm、1.8mm、1.9mm、2.0mm。

In one embodiment, the connector 400 is connected to the first structure portion 200 by butt welding. It is understood that butt welding has the advantages of economical materials, no bending of force lines, uniform force transmission, no obvious stress concentration, contribution to bearing power load and the like.

It should be noted that, the material of the connecting piece 400 is the same as that of the first structural portion 200, and the connecting piece and the first structural portion may be connected by adopting a butt welding process, so as to simplify the connection operation between the two, improve the welding efficiency and improve the connection effect between the two.

It should be noted that, in the embodiment of the present utility model, the melting point of the second structure portion 300 may be higher or lower than that of the connecting member 400.

In one embodiment, the melting point of the second structure 300 is higher than the melting point of the connector 400.

It should be noted that, in this embodiment, the welding energy may be increased according to the requirement, and as the welding energy increases, the connecting piece 400 may maintain a better shape during the welding process, so as to facilitate the fusion welding of two metals with different melting points. This structural arrangement not only can reduce the welding difficulty, but also can promote the welding effect of the connecting member 400 and the second structural portion 300.

Meanwhile, as the connecting piece 400 and the second structural part 300 are welded in a penetrating manner, the flatness of the surface of the connecting piece 400 after welding is high, the connecting effect of the converging piece and the connecting piece 400 can be improved, and the overcurrent capacity between the converging piece and the connecting piece can be improved.

In a specific embodiment, the second structure portion 300 is made of copper, and the first structure portion 200 and the connecting member 400 are made of aluminum.

It should be noted that, when the first structure portion 200 and the connecting piece 400 are made of aluminum, the cover plate assembly may be effectively connected with the aluminum bus piece, so as to reduce the connection difficulty between the cover plate assembly and the bus piece, and improve the assembly efficiency of the battery.

Meanwhile, since the first structural part 200, the connecting piece 400 and the converging piece are all aluminum products, the structural arrangement can also promote the connection effect of the cover plate assembly and the converging piece so as to ensure the connection stability of the battery and the converging piece.

In this embodiment, the material of the second structure portion 300 is copper, so as to meet the connection and overcurrent requirements of the second structure portion 300 and the battery internal cell, so that the battery can function normally.

In one embodiment, the pole assembly is a negative polarity pole assembly.

It should be understood that in lithium batteries, the positive electrode potential is high, copper is easily oxidized at high potential, the oxidation layer is relatively loose, the oxidation potential of aluminum is high, and the aluminum surface layer has a compact oxidation film, so that the internal aluminum is well protected, and therefore, the positive electrode of the lithium battery adopts aluminum. It is noted that, just as the oxide layer of copper is more loose, it is better to place copper at a lower potential negative electrode in order to prevent oxidation. Meanwhile, at low potential, lithium is difficult to form a lithium intercalation alloy with copper. However, at low potential, aluminum will react with lithium to form LiAl, so copper is used as the negative electrode of the lithium battery (i.e., the electrode post assembly in this embodiment).

In another embodiment, the melting point of the second structure portion 300 is lower than the melting point of the connection member 400. The material of the connecting piece 400 is copper, and the material of the second structural portion 300 is aluminum, at this time, the highest point of heat is copper, the aluminum is protected below and is not easy to melt into an amorphous liquid at high temperature, and therefore, the second structural portion 300 and the connecting piece 400 can be effectively connected in the penetration welding process.

In one embodiment, please continue to refer to the structure shown in fig. 2 to 4, the first structure portion 200 forms a step-like structure on the sidewall of the second through hole 201; the step-shaped structure is provided with a step surface, and the step surface is arranged back to the cover plate body 100;

the side wall of the second structure portion 300 is provided with a burring rivet portion protruding toward the inner wall of the second through hole 201, and the second structure portion 300 is riveted to the step surface by the burring rivet portion.

With continued reference to the structure shown in fig. 2, when the cover assembly provided in the embodiment of the present utility model is assembled, the flange riveting portion of the second structure portion 300 in the second through hole 201 is not formed at the beginning. Illustratively, as shown in fig. 2, a portion of the second structure 300 extends from the first through hole 101 into the second through hole 201. It should be noted that the second structure portion 300 has a fixing portion for limiting the relative position of the second structure portion 300 and the cover assembly at the side, and the portion to be fixed abuts against the side of the cover body 100 opposite to the first structure portion 200; then, a flanging riveting manner may be adopted, so that a portion of the second structural portion 300 penetrating into the second through hole 201 is flanged, so that a flanging riveting portion is formed at the portion, and the flanging riveting portion is riveted on the step surface of the first structural portion 200; thereafter, the connection 400 may be combined on top of the second structure portion 300 to form a complete composite pole.

It should be understood that, in this embodiment, the flange riveting portion cooperates with the fixing portion to limit the relative position of the second structural portion 300 and the cover body 100.

In one embodiment, please continue to refer to the structure shown in fig. 1 to 4, the battery provided by the embodiment of the utility model further includes an insulation structure disposed between the composite post and the cover plate assembly. Illustratively, the insulating structure includes a first insulating member 500 and a second insulating member 600, the first insulating member 500 being disposed between the first structure portion 200 and the cap plate body 100; the second insulator 600 is disposed between the fixing portion of the second structure portion 300 and the cover body 100.

It should be noted that, the first insulating member 500 and the second insulating member 600 respectively seal different portions of the cover plate assembly, so as to avoid gaps in the cover plate assembly, improve the sealing degree of the battery, avoid leakage of the electrolyte from the gaps, and cause short circuit, and further improve the structural performance and the safety performance of the battery.

The first insulating member 500 and the second insulating member 600 may be plastic members.

In one embodiment, please continue to refer to the structure shown in fig. 1 to 4, the cover assembly provided by the embodiment of the present utility model further includes a sealing member 700, wherein the sealing member 700 is disposed between the sidewall of the second structure portion 300 and the cover body 100; the seal 700 is a nano injection molded part or a glue coated layer.

It should be noted that, the sealing member 700 may improve the sealing degree between the sidewall of the second structure portion 300 and the cover main body, so as to prevent the electrolyte from leaking to the outside of the battery, thereby improving the structural performance and the safety performance of the battery.

In a second aspect, an embodiment of the present utility model further provides a battery. The battery provided by the embodiment of the utility model comprises the cover plate assembly provided by any of the technical schemes in the first aspect.

It should be noted that, in the battery provided in the embodiment of the utility model, the cover assembly is provided with the first structure portion 200 surrounding the second structure portion 300, so that the connecting member 400 connects the second structure portion 300 and the first structure portion 200. Specifically, the material of the connecting piece 400 is the same as that of the first structural portion 200, so that after connection, the connecting piece is wrapped on the outer surface of the second structural portion 300, and a composite pole is formed with the first structural portion 200 and the second structural portion 300, so that the composite pole is conveniently connected with an external bus piece. Meanwhile, in the cover plate assembly, the connecting piece 400 is independently arranged on the surface of the second structural part 300, so that the second structural part 300 and the connecting piece 400 with different melting points can be conveniently welded by penetrating the welding device. During welding, the welding energy can be increased according to the requirement, and as the welding energy is increased, the connecting piece 400 and/or the second structure part 300 can maintain a better form in the welding process, so that two metals with different melting points can be fused and welded conveniently. This structural arrangement not only can reduce the welding difficulty, but also can promote the welding effect of the connecting member 400 and the second structural portion 300.

In addition, the connection member 400 provides a welding site of the cover plate assembly and the external bus member, so that the first structure portion 200 can be relatively reduced in area, saving costs; moreover, since the connecting piece 400 and the second structural portion 300 are welded by penetration welding, the flatness of the surface of the connecting piece 400 after welding is high, the connection effect of the bus piece and the connecting piece 400 can be improved, and the overcurrent capacity between the bus piece and the connecting piece can be improved.

In one embodiment, the battery provided by the embodiment of the utility model further comprises:

a housing having an opening;

the battery cell is arranged in the shell; the battery cell comprises a battery cell main body and a pole lug part, and the pole lug part is led out from the battery cell main body;

the cover plate component is buckled with the opening to seal the battery core, and the second structure part 300 in the cover plate component is connected with the lug part.

It should be noted that the number of the openings at the housing may be one or two, and each opening is buckled with a cover plate assembly. When the housing has two openings, the number of cover plate assemblies is also 2.

It should be understood that the tab portions may lead from the same side or from different sides of the cell body. The battery cell includes two tab portions, and two second structure portions 300 are led out from opposite sides of the battery cell body, each tab portion corresponds to one opening of the housing, and specifically, the two tab portions include a positive-polarity tab portion and a negative-polarity tab portion.

It is noted that the cell body may be formed via winding or lamination, whether a wound or laminated cell body, with a separator between the positive and negative electrode sheets. The parts of the positive plate and the negative plate with active substances form a battery cell main body, and the parts of the positive plate and the negative plate without active substances form a tab in the battery cell. The lugs of the plurality of positive plates are stacked and folded to form positive-polarity lugs, and the lugs of the plurality of negative plates are stacked and folded to form negative-polarity lugs. The positive-polarity tab portion of the battery cell is connected to the second structural portion 300 of one cap assembly such that the second structural portion 300 forms the positive electrode of the battery, and the negative-polarity tab portion is connected to the second structural portion 300 of the other cap assembly such that the second structural portion 300 forms the negative electrode of the battery.

It will be appreciated that the battery is also internally provided with an electrolyte. The electrolyte consists of electrolyte, organic solvent and additive. The electrolyte is an important material in the battery, can transport lithium ions and provide power required by the battery, and is a key component for the battery to exert energy. During charge and discharge of the battery, the active material of positive polarity and the active material of negative polarity react with the electrolyte.

Of course, the embodiment of the utility model also provides a battery pack. The battery pack comprises the battery and the converging piece according to any technical scheme in the second aspect, wherein the converging piece is connected with a plurality of batteries in the battery pack, the converging piece is at least connected with a connecting piece 400 in each battery, and the material of the connecting piece 400 is the same as that of the converging piece.

It should be noted that, in the battery pack provided in the embodiment of the utility model, the cover assembly is provided with the first structure portion 200 surrounding the second structure portion 300, so that the connecting piece 400 connects the second structure portion 300 and the first structure portion 200. Specifically, the material of the connecting piece 400 is the same as that of the first structural portion 200, so that after connection, the connecting piece is wrapped on the outer surface of the second structural portion 300, and a composite pole is formed with the first structural portion 200 and the second structural portion 300, so that the composite pole is conveniently connected with an external bus piece. Meanwhile, in the battery pack provided by the utility model, the melting point of the second structural part 300 in the cover plate assembly is greater than that of the connecting piece 400, and the connecting piece 400 is independently arranged on the surface of the second structural part 300, and penetration welding is adopted between the two. When welding, welding energy can be increased according to the requirement, so that two metals with different melting points can be conveniently welded in a melting way. This structural arrangement not only can reduce the welding difficulty, but also can promote the welding effect of the connecting member 400 and the second structural portion 300.

Furthermore, it should be noted that the connecting member 400 provides a welding site between the cover plate assembly and the external bus member, so that the first structure portion 200 can be relatively reduced in area and cost-effective; moreover, since the connecting piece 400 and the second structural portion 300 are welded by penetration welding, the flatness of the surface of the connecting piece 400 after welding is high, the connection effect of the bus piece and the connecting piece 400 can be improved, and the overcurrent capacity between the bus piece and the connecting piece can be improved. It should be appreciated that the material of the connecting member 400 is the same as that of the bus member, so that the connecting operation between the two members is facilitated, and the stability of the two members after welding can be improved.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries. The battery module may further include a bracket to which the battery may be fixed.

The battery pack comprises a plurality of batteries and a box body, wherein the box body is used for fixing the plurality of batteries.

The battery pack includes a plurality of batteries, and the plurality of batteries are disposed in the case. Wherein, a plurality of batteries can be installed in the box after forming the battery module. Or, a plurality of batteries can be directly arranged in the box body, namely, the plurality of batteries do not need to be grouped, and the plurality of batteries are fixed by the box body.

Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the utility model being indicated by the following claims. It is to be understood that the utility model is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.

Claims

1. A cover plate assembly, comprising:

the cover plate body is provided with a first through hole;

2. The cover assembly of claim 1, wherein the second structure does not extend beyond a side surface of the first structure facing away from the cover body in an extending direction of the second structure; at least a portion of the connector is disposed within the second through hole.

3. The cover assembly of claim 2, wherein a side surface of the connector facing away from the cover body is flush with a side surface of the first structure facing away from the cover body.

4. A cover plate assembly according to any one of claims 1 to 3, wherein the connector completely covers a side surface of the second formation adjacent the connector.

5. A cover plate assembly according to any one of claims 1 to 3, wherein the thickness of the connector is in the range 0.05mm to 5mm.

6. A cover plate assembly according to any one of claims 1 to 3, wherein the second structure portion has a melting point higher than that of the connecting member.

7. The cover assembly of claim 6, wherein the second structure is copper and the first structure and the connecting member are aluminum.

8. The cover plate assembly of claim 7 wherein the pole assembly is a negative polarity pole assembly.

9. A cover plate assembly according to any one of claims 1 to 3, wherein the first structure portion forms a stepped structure at a side wall of the second through hole; the step-shaped structure is provided with a step surface, and the step surface is arranged back to the cover plate body;

the side wall of the second structure part is provided with a flanging riveting part protruding to the inner wall of the second through hole, and the second structure part is riveted on the step surface through the flanging riveting part.

10. A battery comprising a cover assembly as claimed in any one of claims 1 to 9.