CN220021505U - Outer conductive member, top cover and battery - Google Patents

Abstract

The utility model provides an outer conductive part, a top cover and a battery, and relates to the technical field of batteries. The outer conductive piece comprises a first metal piece and a second metal piece which are different in material, a protruding limiting portion is arranged on the surface of the first metal piece, which faces the second metal piece, the limiting portion is abutted against the surface of the second metal piece, which faces the first metal piece, and the first metal piece and the second metal piece form a welding space communicated with the outside at Zhou Cewei of the limiting portion. Through this kind of setting, utilize the welding space that forms to hold the solder, the technology implementation of conveniently carrying out welded connection to first metal part and second metal part increases the welded connection reliability degree of first metal part and second metal part simultaneously.

Description

Outer conductive member, top cover and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to an external conductive part, a top cover and a battery.

Background

At present, in a square shell battery, an electrode assembly and a pole post are electrically connected in a mode of a switching sheet, a pole lug is arranged on the electrode assembly, the switching sheet comprises a pole post connecting region and a pole lug connecting region, the pole lug connecting region is electrically connected with the pole lug, and the assembled whole is electrically connected with the pole post through the pole post connecting region to finish the extraction and assembly of an electrode.

There are also modes of adopting the pole to have no switching piece in the prior art, through forming the bottom plate at the bottom surface of pole, the pole stretches out the apron through-hole on the apron body and carries out electric connection with outer conductive member, and the bottom plate is located one side that is close to the electrode assembly of apron body and is equipped with the insulating member between bottom plate and the apron body, and the utmost point ear electricity that draws forth on bottom plate and the electrode assembly is connected.

At present, because the materials of the electrode post and the bus bar which are welded and connected with the outer conductive piece are different, the outer conductive piece is manufactured in a mode of combining and welding a copper plate and an aluminum plate so as to meet the purpose of respectively welding the electrode post and the bus bar which are different in materials. When the copper plate and the aluminum plate are welded in a combined mode through a brazing process, liquid solder is difficult to fully flow into contact surfaces of the copper plate and the aluminum plate, insufficient welding is easy to occur, and the welding strength is insufficient.

Disclosure of Invention

The utility model aims to overcome the defects of insufficient welding and poor welding effect of an outer conductive member in the prior art, and provides the outer conductive member, a top cover and a battery.

The utility model solves the technical problems by the following technical scheme:

the utility model provides an outer electrically conductive spare, its characterized in that, outer electrically conductive spare includes first metal piece and the second metal piece that the material is different first metal piece orientation has bellied spacing portion on the surface of second metal piece, spacing portion butt in the second metal piece orientation first metal piece's surface, first metal piece with the second metal piece is in the welding space with external intercommunication is become to spacing portion Zhou Cewei.

In this scheme, through set up bellied spacing portion on the surface of first metalwork towards the second metalwork to in the week side position department of spacing portion, enclose into the welding space with external intercommunication through first metalwork and second metalwork, in order to be used for holding the solder, conveniently carry out welded connection's technology implementation to first metalwork and second metalwork, increase the welded connection reliability degree of first metalwork and second metalwork simultaneously.

Further, a concave positioning part is arranged on the surface of the second metal piece, which faces the first metal piece, the end side of the limiting part is arranged and positioned in the positioning part, and the concave depth of the positioning part is smaller than the convex height of the limiting part.

In this scheme, through setting up the location portion that is used for holding and location spacing portion end side on the second metalwork, realize the location to first metalwork, avoid first metalwork to produce the displacement relative second metalwork before the welding. Meanwhile, the concave depth of the positioning part is smaller than the convex height of the limiting part, so that under the condition that the limiting part is positioned in the positioning part, enough extending distance is still reserved to form a welding space between the first metal piece and the second metal piece.

Further, on the first metal piece, the number of the limiting parts is multiple, and the limiting parts are uniformly distributed at intervals along the circumferential direction of the first metal piece.

In this scheme, through evenly setting up spacing portion on first metalwork, realize the multiple spot support and spacing of relative second metalwork for in the welding process, welding space's size and shape can not change because of outside local atress, and then improve welding precision.

Further, the shape of the limiting part is cylindrical.

In this scheme, spacing portion adopts cylindricly, compares and adopts other shapes more easily processing, can also avoid appearing the dead angle at the week side of spacing portion simultaneously, consequently can be convenient for fill the solder at the week side of spacing portion more.

Further, the material density of the first metal piece is smaller than that of the second metal piece.

In this scheme, under the different prerequisite of material density of first metalwork and second metalwork, through set up spacing portion on the first metalwork that material density is less relatively, can reduce the volume of second metalwork to reduce the weight of whole outer electrically conductive piece.

Furthermore, the surface of the first metal piece facing the second metal piece is also provided with a plug-in connection part, the second metal piece is provided with a matching part matched with the plug-in connection part, and the first metal piece and the second metal piece are connected in a matching way through the plug-in connection part and the matching part.

In the scheme, the first metal piece and the second metal piece are connected in a matched mode through the inserting part and the matching part, so that the first metal piece and the second metal piece are positioned in advance before being welded, and the implementation of a welding process is facilitated. Simultaneously, first metalwork and second metalwork link to each other through welding and cooperation connection simultaneously, and the connection reliability of both is higher.

Further, on the first metal piece, the number of the limiting parts and the number of the inserting parts are all multiple, and along the circumferential direction of the first metal piece, the limiting parts and the inserting parts are alternately arranged.

In this scheme, through setting up spacing portion and grafting portion in turn to the force action condition between dispersion first metalwork and the second metalwork avoids local atress.

Further, the insertion portion is a protrusion protruding from the surface of the first metal piece, and the matching portion is a through hole penetrating through the second metal piece.

In this scheme, through this structure setting, can reduce the cooperation degree of difficulty between grafting portion and the cooperation portion, simultaneously, set up the cooperation portion into the through-hole that link up, can make the cooperation structure of formation more reliable.

Further, the matching part is a stepped through hole comprising a first through hole and a second through hole;

along the direction of stretching into of grafting portion, the projection of first through-hole is located the projection scope of second through-hole, the grafting portion holding in the interior week side surface of cooperation portion with the pore wall shape of cooperation portion cooperatees.

In the scheme, the connection strength when the stepped through hole of the matching part is matched with the plugging part is improved by changing the cross section shape of the stepped through hole of the matching part from small to large in the extending direction of the plugging part.

A top cap, comprising: a cover plate body; an electrode lead; the outer conductive piece is provided with the connecting hole, and the electrode lead-out piece penetrates through the cover plate body and is connected with the outer conductive piece at the connecting hole.

In this scheme, form the utmost point post on the apron body through the mode of electrode lead-out piece and outer electrically conductive piece mutual combination installation to reduce the processing degree of difficulty, reduce cost.

Further, the connecting hole penetrates through the first metal piece and the second metal piece in sequence, the number of the limiting parts is multiple, and the limiting parts are uniformly distributed around the connecting hole.

In this scheme, the connecting hole runs through first metalwork and second metalwork in proper order, further reduces the weight of outer electrically conductive spare, reduce cost, and a plurality of spacing parts evenly distributed are around the connecting hole simultaneously for the overall structure symmetry of outer electrically conductive spare is reasonable, ensures the intensity of bonding between first metalwork and the second metalwork.

A battery, characterized in that it comprises: a housing; the top cover is arranged on the shell, and the top cover and the shell are jointly limited with a containing cavity, and the containing cavity is used for containing the battery cell.

In this scheme, through being applied to the battery with above-mentioned top cap, electric core holding can not break away from easily in the inside of battery, and then makes the overall structure of battery more stable, and the electricity is connected more reliably.

The utility model has the positive progress effects that:

through set up bellied spacing portion on the surface of first metalwork towards the second metalwork to in the week side position department of spacing portion, enclose into the welding space with external intercommunication through first metalwork and second metalwork, in order to be used for holding the solder, conveniently carry out welded connection's technology implementation to first metalwork and second metalwork, increase the welded connection reliability of first metalwork and second metalwork simultaneously.

Drawings

Fig. 1 is a schematic bottom structure of a first metal piece and a second metal piece according to an embodiment of the utility model.

Fig. 2 is a schematic top structure of a first metal piece and a second metal piece according to an embodiment of the utility model.

Fig. 3 is a schematic cross-sectional view of an outer conductive member according to an embodiment of the utility model.

Fig. 4 is a schematic top view of a top cover according to an embodiment of the utility model.

Fig. 5 is a schematic view of the cross-sectional structure A-A of fig. 4.

Fig. 6 is a partially enlarged schematic view at B of fig. 5.

Reference numerals illustrate:

top cover 1

Outer conductive member 11

Cover plate body 12

Electrode lead-out member 13

First metal piece 111

Second metal piece 112

Connection hole 113

Limit part 1111

Plug 1112

Positioning portion 1121

Fitting portion 1122

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 are exemplary and intended to illustrate the present utility model and should not be construed as limiting the utility model, and all other embodiments, based on the embodiments of the present utility model, which may be obtained by persons of ordinary skill in the art without inventive effort, are within the scope of the present utility model.

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", "circumferential", "radial", 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 simplify 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, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this embodiment, a top cover 1 is provided, which is applied to a battery. As shown in fig. 4, a schematic top view structure of the top cover 1 is shown, the battery is a square battery, that is, the top cover 1 is a square cover plate, as shown in fig. 5 and 6, each top cover 1 specifically includes a cover plate body 12, an electrode lead-out member 13 and an outer conductive member 11, and as shown in fig. 1, 2 and 3, a connecting hole 113 is formed at a central axis of the outer conductive member 11, the electrode lead-out member 13 penetrates through the cover plate body 12 and is connected with the outer conductive member 11 at the connecting hole 113, and a pole is formed on the cover plate body 12 in a manner of mutually combining and installing the electrode lead-out member 13 and the outer conductive member 11, so as to reduce processing difficulty and cost.

In this embodiment, as shown in fig. 1, 2 and 3, the specific structure of the outer conductive member 11 is shown in fig. 1, 2 and 3, the outer conductive member 11 includes a first metal member 111 and a second metal member 112 with different materials, and the main structures of the first metal member 111 and the second metal member 112 are both annular plate structures, wherein the outer diameter of the first metal member 111 is larger than the outer diameter of the second metal member 112. The first metal piece 111 is provided with four protruding limiting portions 1111 on a surface facing the second metal piece 112, the protruding limiting portions 1111 are equally spaced from the center of the first metal piece 111 on the surface, the four limiting portions 1111 are disposed in pairs, and connecting lines between the two pairs of limiting portions 1111 disposed in pairs are perpendicular to each other. The four limiting portions 1111 are respectively abutted against the surface of the second metal member 112 facing the first metal member 111, and the first metal member 111 and the second metal member 112 form a welding space communicating with the outside at Zhou Cewei of each limiting portion 1111. With this arrangement, the solder can be accommodated by using the formed soldering space, the process of soldering the first metal piece 111 and the second metal piece 112 can be conveniently performed, and the reliability of the soldering of the first metal piece 111 and the second metal piece 112 can be increased. The solder can be liquid solder which flows into the welding space or solid solder which is placed in the welding space and then is melted by heating and is solidified for connection.

Further, as shown in fig. 2, the surface of the second metal piece 112 facing the first metal piece 111 is provided with recessed positioning portions 1121, and similarly, the number of the positioning portions 1121 is four, the four positioning portions 1121 are arranged in pairs, and the connecting lines between the two pairs of positioning portions 1121 arranged in pairs are perpendicular to each other. The four positioning portions 1121 on the second metal piece 112 are arranged in one-to-one correspondence with the four limiting portions 1111 on the first metal piece 111, so that the end sides of the limiting portions 1111 can be positioned in the corresponding positioning portions 1121, the recess depth of the positioning portions 1121 is smaller than the protrusion height of the limiting portions 1111, and the optimal arrangement is that the recess depth of the positioning portions 1121 is smaller than the protrusion height of the limiting portions 1111 by at least 0.01mm. Positioning of the first metal piece 111 is achieved by providing the positioning portion 1121 for accommodating and positioning the end side of the limiting portion 1111 on the second metal piece 112, and displacement of the first metal piece 111 relative to the second metal piece 112 before welding is avoided. Meanwhile, the recess depth of the positioning portion 1121 is smaller than the protrusion height of the limiting portion 1111, so that there is still a sufficient protruding distance to form a welding space between the first metal member 111 and the second metal member 112 in the case where the limiting portion 1111 is positioned in the positioning portion 1121.

It should be noted that, in this embodiment, the number of the limiting portions 1111 on the first metal piece 111 is four, the four limiting portions 1111 are circumferentially arranged at intervals on the first metal piece 111, the number of the positioning portions 1121 on the corresponding second metal piece 112 is also four, and the four positioning portions 1121 are circumferentially arranged at intervals on the second metal piece 112.

In addition, in this embodiment, the shape of the limiting portion 1111 is cylindrical, the diameter of the cylindrical shape is between 0.5mm and 8mm, and most preferably between 2mm and 4mm, and meanwhile, the concave space of the corresponding positioning portion 1121 is also cylindrical, and the cylindrical shape is adopted, so that the processing is easier than that adopting other shapes, and meanwhile, dead angles on the periphery of the limiting portion 1111 can be avoided, so that the solder can be more conveniently filled on the periphery of the limiting portion 1111. Of course, in other embodiments, the number, the position and the shape of the limiting portions 1111 on the first metal member 111 can be adjusted according to actual needs, and the number, the position and the shape of the positioning portions 1121 on the corresponding second metal member 112 can be correspondingly adjusted.

Further, the material density of the first metal piece 111 is smaller than that of the second metal piece 112. Because the limiting part 1111 is arranged on the first metal member 111 with relatively smaller material density on the premise that the material densities of the first metal member 111 and the second metal member 112 are different, the volume of the second metal member 112 can be reduced, thereby reducing the weight of the whole outer conductive member 11 and saving the cost. In particular, in the present embodiment, the first metal piece 111 is made of aluminum, the second metal piece 112 is made of copper, and the density of copper is greater than that of aluminum, and by providing the limiting portion 1111 on the first metal piece 111, the usage volume of copper can be reduced, and the weight of the whole outer conductive piece 11 can be further reduced. Since the electrode lead-out member 13 of the top cover 1 is connected to the second metal member 112 of the outer conductive member 11, the electrode lead-out member 13 is also made of copper, and the first metal member 111 of the outer conductive member 11 is made of aluminum, so that the electrode lead-out member is electrically connected to the outside. However, in other embodiments, the specific materials of the first metal piece 111 and the second metal piece 112 may be adjusted according to actual needs, and the present utility model is not limited thereto.

Further, as shown in fig. 1, 2 and 3, the surface of the first metal piece 111 facing the second metal piece 112 is further provided with four plugging portions 1112, the distances from the four plugging portions 1112 to the center of the first metal piece 111 on the surface of the first metal piece 111 are equal, the four plugging portions 1112 are disposed in pairs, and the connecting lines between the two pairs of opposite plugging portions 1112 are perpendicular to each other. On the surface of the second metal piece 112 facing the first metal piece 111, four mating portions 1122 are disposed corresponding to the four plugging portions 1112, the four mating portions 1122 are disposed in a pair-by-pair manner, connecting lines between two pairs of mating portions 1122 disposed in a pair are perpendicular to each other, and the four mating portions 1122 are disposed in a one-to-one correspondence with the four plugging portions 1112. The mating connection of the first metal piece 111 and the second metal piece 112 is realized through the plug-in connection portion 1112 and the mating portion 1122, so that the first metal piece 111 and the second metal piece 112 are pre-positioned before being welded, and the implementation of a welding process is facilitated. Meanwhile, the first metal piece 111 and the second metal piece 112 are connected by welding and mating connection at the same time, and the connection reliability of the two is higher.

Further, on the surface of the first metal piece 111 facing the second metal piece 112, four limiting portions 1111 and four inserting portions 1112 are alternately arranged, and correspondingly, on the surface of the second metal piece 112 facing the first metal piece 111, four positioning portions 1121 and four matching portions 1122 are alternately arranged, so that the force acting condition between the first metal piece 111 and the second metal piece 112 can be dispersed through the alternate arrangement, and local stress can be avoided.

In addition, in this embodiment, the plugging portion 1112 is specifically a protrusion on the surface of the first metal piece 111, and the mating portion 1122 is a through hole penetrating through the second metal piece 112, so that the difficulty in mating between the plugging portion 1112 and the mating portion 1122 can be reduced by this structure, and meanwhile, the mating structure formed by the mating portion 1122 being a through hole can be more reliable. Specifically, as shown in fig. 3, the fitting portion 1122 is specifically a stepped through hole including a first through hole and a second through hole, when the insertion portion 1112 is inserted into the corresponding stepped through hole, the first through hole is closer to the first metal piece 111 than the second through hole, a projection of the first through hole along an insertion direction of the insertion portion 1112 is located within a projection range of the second through hole, and a peripheral surface of the insertion portion 1112 accommodated in the fitting portion 1122 is matched with a hole wall shape of the fitting portion 1122. The cross-sectional shape of the stepped through hole changes from small to large in the extending direction of the insertion portion 1112, thereby improving the connection strength when being matched with the insertion portion 1112. Similarly, in other embodiments, the mating portion 1112 on the first metal piece 111 and the mating portion 1122 on the second metal piece 112 may also be adjusted in number, position and shape according to actual needs.

As described above, the outer conductive member 11 is provided with the connecting hole 113 at the position of the central axis, further, the connecting hole 113 sequentially penetrates through the first metal member 111 and the second metal member 112, so that the weight of the outer conductive member 11 is further reduced, the cost is reduced, and simultaneously, the four limiting portions 1111 are uniformly distributed around the connecting hole 113, so that the overall structure of the outer conductive member 11 is symmetrical and reasonable, and the bonding strength between the first metal member 111 and the second metal member 112 is ensured.

Finally, the top cover 1 is arranged on the shell of the battery, and a containing cavity is defined by the top cover and the shell, and the battery cell is contained in the containing cavity. Through being applied to the battery with above-mentioned top cap 1, the electric core holding can not break away from easily in the inside of battery, and then makes the overall structure of battery more stable, and the electricity is connected more reliably.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims (12)

1. The utility model provides an outer electrically conductive spare, its characterized in that, outer electrically conductive spare includes first metal piece and the second metal piece that the material is different first metal piece orientation has bellied spacing portion on the surface of second metal piece, spacing portion butt in the second metal piece orientation first metal piece's surface, first metal piece with the second metal piece is in the Zhou Cewei of spacing portion becomes the welding space with external intercommunication.

2. The outer conductive member according to claim 1, wherein a recessed positioning portion is provided on a surface of the second metal member facing the first metal member, an end side of the stopper portion is provided and positioned in the positioning portion, and a recess depth of the positioning portion is smaller than a projection height of the stopper portion.

3. The outer conductive member according to claim 1, wherein the number of the stopper portions is plural in the first metal member, and the plural stopper portions are uniformly spaced apart in the circumferential direction of the first metal member.

4. The outer conductive member of claim 1 wherein the stop portion is cylindrical in shape.

5. The outer conductive member of claim 1 wherein the first metal member has a material density less than a material density of the second metal member.

6. The outer conductive member according to claim 1, further comprising a mating portion on a surface of the first metal member facing the second metal member, wherein a mating portion is provided on the second metal member to mate with the mating portion, and wherein the first metal member and the second metal member are mated and connected by the mating portion and the mating portion.

7. The outer conductive member according to claim 6, wherein the number of the stopper portions and the insertion portions is plural in the first metal member, and the stopper portions and the insertion portions are alternately arranged in the circumferential direction of the first metal member.

8. The outer conductive member according to claim 6, wherein the insertion portion is a protrusion protruding from a surface of the first metal member, and the mating portion is a through hole penetrating through the second metal member.

9. The outer conductive member as set forth in claim 8, wherein the fitting portion is a stepped through hole including a first through hole and a second through hole;

along the direction of stretching into of grafting portion, the projection of first through-hole is located the projection scope of second through-hole, the grafting portion holding in the interior week side surface of cooperation portion with the pore wall shape of cooperation portion cooperatees.

10. A top cap, comprising:

a cover plate body;

an electrode lead;

the outer conductive member according to any one of claims 1 to 9, wherein a connection hole is provided in the outer conductive member, and the electrode lead-out member is provided through the cap body and connected to the outer conductive member at the connection hole.

11. The top cover of claim 10, wherein the connecting hole sequentially penetrates through the first metal piece and the second metal piece, the number of the limiting parts is multiple, and the limiting parts are uniformly distributed around the connecting hole.

12. A battery, characterized in that it comprises:

a housing;

the top cover according to any one of claims 10 or 11, being disposed on the housing and defining with the housing a receiving cavity for receiving a battery cell.