CN210805904U

CN210805904U - Battery module and connecting piece thereof

Info

Publication number: CN210805904U
Application number: CN201921764018.3U
Authority: CN
Inventors: 马亚强; 赖庆; 朱建华; 刘凯; 朱燕
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-06-19
Anticipated expiration: 2029-10-17

Abstract

The utility model relates to a battery module and connecting piece thereof, battery module connecting piece include the connection piece body, and the connection piece body has the end of drawing forth that is used for being connected with different battery modules to and be used for the link that is connected with battery utmost point post, draw forth end and link integrated into one piece, draw forth the end and be formed with the mounting hole, this battery module connecting piece still includes the gasket of nested fixing in the mounting hole. The leading-out end and the connecting end are of an integrated structure, the technical problem that the existing lap joint type battery module connecting piece is Z-high in height can be solved, the module height is reduced, and the energy density of the battery module is improved. By adopting the embedded battery module connecting piece, when the battery module connecting piece is installed on a battery module and fastened, the problem that the connecting part fails due to the fact that a screw drives the gasket to rotate does not exist, and current transmission is not influenced; the gasket has no bent structure, can carry out nickel plating treatment on each surface of the gasket, and solves the problem of higher cost caused by the local silver plating of the existing silver-plated pure aluminum connecting sheet.

Description

Battery module and connecting piece thereof

Technical Field

The utility model relates to a battery module connects the field, specifically relates to a battery module connecting piece and installs battery module of this connecting piece.

Background

The battery module connecting piece, such as a copper-aluminum connecting piece, is used for leading out the power of battery module, realizes that a plurality of battery modules are connected in series or in parallel to form power battery system. In the related technology, the battery module connecting piece mainly comprises a lap joint type copper-aluminum brazing connecting piece and a silver-plated pure aluminum connecting piece, wherein the space of the battery module in the horizontal direction is limited, and the lap joint area of copper and aluminum in the lap joint type copper-aluminum brazing connecting piece, namely the welding area cannot be large, the contact area is small, and the lap joint type copper-aluminum brazing connecting piece is not beneficial to current transmission; by adopting lap joint type welding, when a screw is screwed to fix the connecting sheet on the battery module, the copper end can be driven to rotate, so that the connection failure at the copper-aluminum lap joint part is easily caused, and the current transmission is influenced; in addition, because adopt the overlap joint mode welding for module Z is to high increase, and occupation space is great, is unfavorable for improving the energy density of battery module.

The silver-plated pure aluminum connecting piece is easy to deform during screw fixation due to low material hardness, contact resistance is easy to increase, and accordingly safety problems are caused due to local overheating.

SUMMERY OF THE UTILITY MODEL

The first purpose of the disclosure is to provide a battery module connecting piece, which can solve the technical problems that the existing lap joint type copper-aluminum brazing connecting piece is small in contact area, connection failure is easy to occur at a lap joint part, and the occupied space is large due to overhigh Z-direction height; meanwhile, the technical problem that the existing silver-plated pure aluminum connecting piece is high in local silver plating process cost can be solved.

A second object of the present disclosure is to provide a battery module, on which the battery module connecting member provided by the present disclosure is mounted.

In order to achieve the purpose, the disclosure provides a battery module connecting piece, which comprises a connecting piece body, wherein the connecting piece body is provided with a leading-out end and a connecting end, the leading-out end is used for being connected with different battery modules, the connecting end is used for being connected with a battery pole, the leading-out end and the connecting end are integrally formed, a mounting hole is formed in the leading-out end, and the battery module connecting piece further comprises a gasket which is fixed in the mounting hole in a nested mode.

Optionally, the terminal is connected perpendicularly to an end of the connection end.

Optionally, the gasket includes a gasket body and a protrusion formed on the gasket body, the protrusion is embedded in the mounting hole, and the gasket body is attached to the connecting sheet body.

Optionally, the gasket body and the bulge are formed with a threaded fastening hole therethrough.

Optionally, the mounting hole is configured as a square hole, and the protrusion is configured as a square protrusion matching with the square hole in shape.

Optionally, a through hole for connecting with a battery post is formed on the connecting end.

Optionally, a groove is formed on the connection end.

Optionally, the surface of the gasket is formed with a nickel plating layer.

Optionally, the shim has a hardness greater than a hardness of the tab body.

According to a second aspect of the present disclosure, a battery module is also provided, and the above-mentioned battery module connecting member is fixed on the battery module by a fastener.

Through the technical scheme, the leading-out end and the connecting end are of an integrally formed structure, the technical problem that the Z-direction height of the existing lap joint type battery module connecting piece is too high can be solved, the module height is reduced, the energy density of a battery module is improved, and the space is saved; meanwhile, the first connecting sheet and the second connecting sheet are not required to be fixed by a special welding positioning clamp, clamping and positioning operations are cancelled, and the assembling efficiency is improved. The embedded battery module connecting piece is adopted, so that the contact area between the connecting piece body and the gasket is large, and the overcurrent capacity is strong; and, when installing this battery module connecting piece on the battery module fastening, can not have because of the rotatory problem that leads to the junction to become invalid of screw drive gasket, influence the current transfer. In addition, the gasket has no bent structure, can carry out nickel plating treatment on each surface of the gasket, and solves the technical problem of higher cost caused by the local silver plating of the existing silver-plated pure aluminum connecting sheet.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic structural view of a lap joint type copper-aluminum brazing connecting sheet in the related art;

FIG. 2 is an exploded view of a related art lap joint copper aluminum brazing tab;

FIG. 3 is a schematic structural view of a silver-plated pure aluminum connecting sheet in the related art;

fig. 4 is a schematic structural view of a battery module in the related art;

FIG. 5 is a schematic view of a lap-joint copper-aluminum brazing connecting sheet mounted on a battery module;

FIG. 6 is a schematic view showing a structure in which silver-plated pure aluminum tabs are mounted on a battery module;

fig. 7 is a schematic structural view of a battery module connecting member according to an exemplary embodiment of the present disclosure;

fig. 8 is an exploded view of a battery module connecting member according to an exemplary embodiment of the present disclosure;

fig. 9 is an exploded view of a battery module connecting member according to an exemplary embodiment of the present disclosure;

fig. 10 is a schematic structural view illustrating a structure in which a battery module connector according to an exemplary embodiment of the present disclosure is mounted on a battery module.

Description of the reference numerals

1 connecting piece body 10 mounting hole

11 leading-out end 12 connecting end

13 through hole and 14 groove

2 shim 20 threaded fastener hole

21 gasket body 22 projection

100 battery module connector 101 first connection tab

102 second connecting piece 3 battery module

4 Square nut

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, use of directional words such as "upper" and "lower" generally means that the terms are defined with reference to the drawing plane of the corresponding drawing, and "inner and outer" means that the corresponding part is contoured both inwardly and outwardly. Furthermore, the terms "first," "second," and the like, as used in this disclosure, are intended to distinguish one element from another, and not necessarily for order or importance. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.

As shown in fig. 1 and 2, the existing lap joint type battery module connecting piece includes a first connecting piece 101 and a second connecting piece 102, the first connecting piece 10 is used for connecting with a battery pole, as a connecting end 12, it can be an aluminum sheet, the second connecting piece 102 is used for connecting with different battery modules, as a leading-out end 11, it can be a copper sheet, the surface of the second connecting piece 102 is plated with nickel, and because the copper sheet has high hardness, small contact resistance, strong overcurrent capacity, small heat generation amount, high safety of the connecting part, and serial connection or parallel connection between a plurality of battery modules can be realized.

However, the lap joint type battery module connecting member requires fixing the two parts by a tool and welding the lap joint part when welding. Because the space of the battery module in the horizontal direction is limited, the lap joint area of the first connecting sheet 101 and the second connecting sheet 102, namely the welding area, cannot be large, the contact area is small, and the current transmission is not facilitated; when the connecting sheet is fixed on the battery module by screwing the screw, the second connecting sheet 102 is driven to rotate, so that the connection failure at the lap joint is easily caused, and the current transmission is influenced; in addition, because adopt the overlap joint mode welding for module Z is to high increase, and occupation space is great, is unfavorable for improving the energy density of battery module.

As shown in fig. 3, the conventional silver-plated pure aluminum battery module connecting piece is of an integrated structure, and is easy to deform during screw fixation due to low material hardness, so that contact impedance is easily increased, and local overheating is easily caused to cause a safety problem. In addition, in order to improve the contact area and reduce the contact impedance, the connection part of the leading-out terminal 11 connected with different battery modules is generally subjected to silver plating treatment, but the connection terminal 12 is required to be welded and fixed with a battery pole and is made of an aluminum material body, and the silver plating treatment cannot be carried out, namely, the existing silver-plated pure aluminum battery module connecting piece can only be subjected to local silver plating, so that the process difficulty is high and the cost is high.

As shown in fig. 4 to 6, when the battery module connecting member 100 is mounted on the battery module 3 for use, a limiting groove needs to be formed in the battery module 3 to limit the square nut 4 and fix the square nut by using other components such as a screw, or fix a pre-embedded nut on the battery module 3, so that the number of connecting components is large, the torque is limited, and the assembly is affected.

In order to solve the above problems, as shown in fig. 7 to 9, the present disclosure provides a battery module connecting member, which includes a connecting sheet body 1, the connecting sheet body 1 having a leading-out terminal 11 for connecting with different battery modules, and a connecting terminal 12 for connecting with a battery post, the leading-out terminal 11 and the connecting terminal 12 being integrally formed, the leading-out terminal 11 being formed with a mounting hole 10, and a gasket 2 nested and fixed in the mounting hole 10. Here, it should be noted that the spacer 2 may be fixed in any appropriate position of the tab body 1 by being nested, depending on the structure of the tab body 1 and the connection position of the plurality of battery modules 3, and the contact area between the spacer 2 and the tab body 1 may be adjusted according to actual needs. In this disclosure, the hardness of gasket 2 is greater than the hardness of connection piece body 1, for example, connection piece body 1 can be the aluminum sheet, and gasket 2 can be the copper sheet, can enough realize the holistic lightweight design of connecting piece, draws forth end 11 and gasket 2 and takes place to warp when can also avoiding twisting the screw simultaneously, guarantees to draw forth the joint strength of end 11. The gasket 2 may be wholly or partially nested and fixed in the mounting hole 10 to accomplish the assembly of the battery module connecting member 100.

Through the technical scheme, the leading-out end 11 and the connecting end 12 are of an integrally formed structure, the technical problem that the Z-direction height of the existing lap joint type battery module connecting piece is too high can be solved, the module height is reduced, the energy density of a battery module is improved, and the space is saved; meanwhile, the first connecting sheet 101 and the second connecting sheet 102 are not required to be fixed by a special welding positioning clamp, clamping and positioning operations are cancelled, and the assembling efficiency is improved. Adopt embedded battery module connecting piece, the area of contact of connection piece body 1 and gasket 2 is big, and the current capacity is strong to, when installing this battery module connecting piece 100 to the fastening on battery module 3, can not have because of the rotatory problem that leads to the junction to become invalid of screw drive gasket 2, influence the current transfer. In addition, the gasket 2 has no bent structure, can carry out nickel plating treatment on each surface of the gasket, and solves the technical problem of higher cost caused by the local silver plating of the existing silver-plated pure aluminum connecting sheet.

The terminal 11 is perpendicularly connected to an end of the connection end 12, and in an exemplary embodiment of the present disclosure, as shown in fig. 7 and 8, the connection piece body 1 may be configured in an L-shaped structure, a horizontal section of the L-shaped structure is configured as the connection end 12 of the connection piece body 1, a vertical section of the L-shaped structure is configured as the terminal 11 of the connection piece body 1, and the gasket 2 is fixed on an inner wall of the terminal 11 in a nested manner. The connecting end 12 is connected with the battery pole, the leading-out end 11 leads out the power of the battery module 3 and is connected with other battery modules, and the gasket 2 is fixed on the inner wall of the leading-out end 11, so that the safety of the connecting part can be ensured, and the space is saved. In other embodiments, the spacer 2 may be further fixed to an outer wall of the terminal 11 in a nesting manner, which is not limited herein, where "inside" refers to a side wall of the terminal 11 for connecting with the connecting end 12, and an opposite side wall is "outside", and in other embodiments, the connecting piece body 1 may also be a horizontal plate structure, the spacer 2 is fixed to a proper position of the horizontal plate in a nesting manner, the connecting piece body 1 may also be a U-shaped plate structure, and the spacer 2 is fixed to two side walls of the U-shaped plate in a nesting manner, which is not limited herein.

The manner in which the spacer 2 is nestingly secured within the mounting hole 10 can be varied. As shown in fig. 9, the gasket 2 includes a gasket body 21 and a protrusion 22 formed on the gasket body 21, the protrusion 22 is inserted into the mounting hole 10, and the gasket body 21 and the connection piece body 1 are attached to each other, so that it is ensured that the gasket 2 is stably fixed in the mounting hole 10 and welded to complete the assembly of the whole battery module connection member 100.

Further, in the present disclosure, the gasket body 21 and the boss 22 are formed with the screw fastening hole 20 penetrating therethrough. That is, before

connection piece body

1 and 2 assemblies of gasket, threaded fastening hole 20 has been processed on the gasket 2, when installing this connecting piece to battery module 3 on, need not buried nut in advance or do the draw-in groove and inlay the nut, simplified module end plate preparation, the cost is reduced.

The protrusion 22 may be designed accordingly according to the shape and size of the mounting hole 10. In this disclosure, as shown in fig. 9, the mounting hole 10 can be configured as a square hole, and the protrusion 22 is configured as a square protrusion matched with the shape of the square hole, so that not only the gasket 2 can be fixed in the mounting hole 10 in a nested manner, but also the gasket 2 can be prevented from being driven to rotate when the screw is screwed, and the stability of the joint of the gasket 2 and the connecting sheet body 1 is ensured.

In order to realize the stable connection between the connection end 12 and the battery post, in the present disclosure, as shown in fig. 9, one or more through holes 13 are formed in the connection end 12 for connection with the battery post, when one through hole 13 is formed, the series connection of a plurality of battery modules can be realized, and as shown in the figure, two through holes 13 can be connected to the positive electrode or the negative electrode of two batteries, so as to realize the parallel connection of the two batteries. Further, in order to install the battery module connecting piece 100 that this disclosure provided smoothly on battery module 3, be formed with recess 14 on the link, recess 14 not only can play limiting displacement to the installation of connecting piece, can also absorb the displacement that produces in the inflation process simultaneously, avoids connecting piece and battery joint atress to pull out, and then guarantees the stability of connecting. When there is one through hole 13, the position of the groove 14 may be designed to be any suitable, and when there are a plurality of through holes 13, the groove 14 may be provided between adjacent through holes 13 and extend in the longitudinal direction (the width direction of the horizontal section of the L-shaped structure).

In the present disclosure, the surface of the gasket 2 is formed with a nickel plating layer, that is, before the gasket 2 is embedded and fixed in the connecting sheet body 1, all the surfaces thereof are subjected to a full nickel plating treatment, without partially plating silver on the connecting sheet body 1, thereby reducing the production cost of the electrochemical plating process.

According to a second aspect of the present disclosure, as shown in fig. 10, there is also provided a battery module, wherein the above-described battery module connecting member is fixed on the battery module 3 by a fastening member, such as a screw, so as to realize series connection or parallel connection of a plurality of battery modules 3, and the battery module has all the advantages of the above-described battery module connecting member, which will not be described herein in detail.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. The utility model provides a battery module connecting piece, includes connection piece body (1), connection piece body (1) have be used for leading out end (11) that are connected with different battery module to and be used for link (12) that are connected with the battery utmost point post, its characterized in that, lead out end (11) with link (12) integrated into one piece, it is formed with mounting hole (10) to lead out end (11), battery module connecting piece still includes nested the fixing gasket (2) in mounting hole (10).

2. The battery module connecting member according to claim 1, wherein the lead-out terminal (11) is perpendicularly connected to an end of the connecting terminal (12).

3. The battery module connecting member according to claim 2, wherein the gasket (2) comprises a gasket body (21) and a protrusion (22) formed on the gasket body (21), the protrusion (22) is inserted into the mounting hole (10), and the gasket body (21) and the connecting piece body (1) are attached to each other.

4. The battery module connecting member according to claim 3, wherein the gasket body (21) and the bosses (22) are formed with screw fastening holes (20) therethrough.

5. The battery module connecting member according to claim 3, wherein the mounting hole (10) is configured as a square hole, and the protrusion (22) is configured as a square protrusion having a shape matching the square hole.

6. The battery module connecting member according to claim 1, wherein the connection end (12) is formed with a through-hole (13) for connection with a battery post.

7. The battery module connecting member according to claim 6, wherein the connection end (12) is formed with a groove (14).

8. The battery module connecting member according to claim 1, wherein the surface of the gasket (2) is formed with a nickel-plated layer.

9. The battery module connecting member according to any one of claims 1 to 8, wherein the gasket (2) has a hardness greater than that of the tab body (1).

10. A battery module according to any one of claims 1 to 9, wherein the battery module connecting member is fixed to the battery module (3) by a fastener.