CN210778783U

CN210778783U - Composite bus bar for battery module

Info

Publication number: CN210778783U
Application number: CN201920720572.5U
Authority: CN
Inventors: 许玉林; 龚晓冬; 王爱淑; 张旭; 万向辉
Original assignee: Suzhou Ankao Energy Co Ltd
Current assignee: Suzhou Ankao Energy Co Ltd
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2020-06-16
Anticipated expiration: 2029-05-20

Abstract

The application discloses compound conflux sheet for battery module, including the steel sheet, the system has a plurality of downward convex welding arch on the steel sheet, still including paste arrange in the aluminum sheet of steel sheet upside, the system has a plurality of flanging hole of turning up downwards on the aluminum sheet, it is provided with a plurality of interlock hole to link up on the steel sheet, the pore wall in interlock hole has radial inside convex interlock tooth, the turn-ups in turn-ups hole stretches into in the interlock hole, through inserting the expansion equipment radial extrusion in turn-ups hole the turn-ups in turn-ups hole makes the turn-ups radially outwards expand to warp, and then makes the interlock tooth bites into the turn-ups. The composite bus bar sheet has the advantages of simple structure, convenience in manufacturing, low price and strong overcurrent capacity.

Description

Composite bus bar for battery module

Technical Field

The present application relates to a composite bus bar for a battery module.

Background

The battery module mainly comprises a plurality of battery monomers and a battery clamp (or called battery bracket) for supporting the battery monomers, wherein the battery clamp is provided with a plurality of battery inserting holes which are distributed in a matrix mode, and the end parts of the battery monomers are inserted into the battery inserting holes and are connected with electric conductors embedded in the battery inserting holes, so that the series connection and the connection among the battery monomers are realized.

In order to lead out the voltages (or currents) of the total positive end and the total negative end of the battery module, a bus bar needs to be arranged on the outer side surface of the battery clamp at the extreme end of the battery module, and the bus bar is welded and fixed with the positive end surface (or the negative end surface) of the plurality of battery monomers to realize bus. Because the end face (the positive electrode end face or the negative electrode end face) of each battery monomer is positioned in the battery insertion hole (not flush with the outer side face of the battery clamp), a boss needs to be punched on the bus bar, and during assembly, the boss on the bus bar extends into the battery insertion hole and is welded and fixed with the end face of the battery in the hole.

Because the end face of the battery is made of steel, in order to facilitate the welding of the bus piece and the end face of the battery and ensure that the bus piece has good overcurrent capacity, the traditional bus piece is generally formed by compounding a steel sheet and a copper sheet. The battery comprises a battery body, a steel sheet, a copper sheet, a steel sheet and a battery cover, wherein a bulge welded with the end face of the battery is punched on the steel sheet, the copper sheet and the steel sheet are arranged in an attached mode and are welded and fixed.

However, copper is expensive and the welding of copper sheets to steel sheets requires a lot of labor. The steel sheet is independently used as the confluence sheet, the overcurrent capacity is poor, if the overcurrent capacity is improved by increasing the thickness of the steel sheet, the bulge is difficult to punch on the thick steel sheet, and the thick steel sheet is difficult to weld with the end face of the battery.

Disclosure of Invention

The purpose of the application is: in view of the above problems, a composite bus bar for a battery module is provided, which has a simple structure, is easy to manufacture, is inexpensive, and has a high overcurrent capacity.

The technical scheme of the application is as follows:

the utility model provides a compound confluence piece for battery module, includes the steel sheet, the steel sheet system of punching has a plurality of downward convex welding arch, still including leaning on to arrange in the aluminum sheet of steel sheet upside, the system has a plurality of flanging hole of turning up downwards on the aluminum sheet, it is provided with a plurality of interlock hole to link up on the steel sheet, the pore wall in interlock hole has radial inside convex interlock tooth, the turn-ups in turn-ups hole stretches into in the interlock hole, through inserting the expansion equipment radial extrusion in turn-ups hole the turn-ups in turn-ups hole makes the turn-ups radially outwards expand and warp, and then makes the interlock tooth bites into the turn-ups.

On the basis of the technical scheme, the application also comprises the following preferable scheme:

the occlusion teeth are sharp teeth.

The welding bulges are distributed on the steel sheet in a matrix shape.

At least three engaging holes are uniformly distributed on the periphery of each welding bulge.

Six engaging holes are formed in the periphery of each welding protrusion, and the six engaging holes are evenly distributed around the welding protrusions at intervals.

And through holes which correspond to the welding bulges one by one are formed in the aluminum plate.

The application has the advantages that:

1. the confluence piece is formed by compounding a steel sheet and an aluminum sheet, is convenient to weld and fix with the steel end face of the battery, and has strong overcurrent capacity.

2. The steel sheet and the aluminum sheet are mutually fixed in a mechanical mode by utilizing the flanging hole with the flanging and the occlusion hole with the biting teeth, the structure is simple, the manufacture is convenient, and welding is not needed (the steel and the aluminum are difficult to weld).

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is an exploded view of a composite bus bar in an embodiment of the present application;

FIG. 2 is an enlarged view of section X1 of FIG. 1;

FIG. 3 is an enlarged view of section X2 of FIG. 1;

wherein: 1-steel sheet, 101-welding projection, 102-occlusion hole, 102 a-occlusion tooth, 2-aluminum sheet, 201-flanging hole, 201 a-flanging and 202-through hole.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and the words used to indicate orientation, top, bottom, left, right, etc. are used solely to describe the illustrated structure in connection with the accompanying figures.

One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.

Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any sequence in the figures and examples is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

Fig. 1 to 3 show an embodiment of the composite bus bar for a battery module according to the present invention, which also includes a steel plate 1, the steel plate 1 is substantially horizontally arranged in fig. 1, and a plurality of welding protrusions 101 protruding downward are punched on the steel plate 1 for welding with the end faces of the cells in the battery module, as in the conventional bus bar. Considering that the battery cells in most battery modules are arranged in a matrix, the welding protrusions 101 in this embodiment are also distributed in a matrix on the steel sheet 1.

The key improvement of this embodiment is that the composite collector sheet is also provided with an aluminum sheet 2 placed against the upper side of the aforesaid steel sheet 1. The aluminum sheet is provided with a plurality of flanging holes 201 which are turned out downwards (i.e. the flanging of the flanging hole extends downwards). The steel sheet 1 is provided with a plurality of engaging holes 102 in a penetrating way, and the hole wall of each engaging hole 102 is provided with engaging teeth 102a protruding inwards in the radial direction. The flanging 201a of the flanging hole 201 extends into the engaging hole 102, and the flanging 201a of the flanging hole 201 is radially and outwardly extruded by virtue of expansion equipment inserted into the flanging hole 201, so that the flanging 201a radially and outwardly expands and deforms, when the flanging 201a is in contact with the engaging teeth 102a on the outer side in the process of radially and outwardly expanding and deforming, as the engaging teeth 102a are made of high-hardness steel, and the flanging of the flanging hole 201a is made of low-hardness aluminum, the engaging teeth 102a can be engaged into the flanging 201a, so that the flanging 201a and the engaging teeth 102a are engaged and fixed, and thus, the fixed connection of the upper aluminum sheet 2 and the lower steel sheet 1 is realized.

In order to enhance the biting ability of the biting teeth 102a, it is preferable to provide the biting teeth 102 in a sharp pointed tooth configuration.

Six engaging holes 102 are formed in the periphery of each welding protrusion 101, and the six engaging holes 102 are uniformly spaced around the welding protrusion 101.

Considering that the flatness of the steel sheet 1 at the position (upper surface) of the welding projection 101 is poor, if the aluminum sheet 2 is provided with a solid structure at this position, the adhesion between the aluminum sheet 2 and the steel sheet 1 is poor. Therefore, in the present embodiment, the aluminum plate 2 is provided with a plurality of through holes 202, and the through holes 202 are also arranged in a matrix shape and correspond to the positions of the welding protrusions 101 on the steel sheet 1 one by one. And the structure also reduces the material consumption of the aluminum sheet.

The above embodiments are only for illustrating the technical concepts and features of the present application, and the purpose of the embodiments is to enable people to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.

Claims

1. A composite confluence plate for a battery module comprises a steel sheet (1), wherein a plurality of welding bulges (101) protruding downwards are punched on the steel sheet (1), it is characterized by also comprising an aluminum sheet (2) which is arranged on the upper side of the steel sheet (1) in an attached manner, a plurality of flanging holes (201) which are turned out downwards are formed on the aluminum sheet (2), a plurality of engaging holes (102) are arranged on the steel sheet (1) in a penetrating way, the hole wall of the engaging hole (102) is provided with engaging teeth (102a) protruding inwards in the radial direction, the turned edge (201a) of the turned edge hole (201) extends into the engaging hole (102), radially pressing a burring (201a) of the burring hole (201) by an expansion device inserted into the burring hole (201), so that the flanging (201a) expands and deforms outwards in the radial direction, and the meshing teeth (102a) are meshed with the flanging (201 a).

2. The composite bus bar for battery modules according to claim 1, wherein the engaging teeth (102a) are pointed teeth.

3. The composite bus bar for battery modules according to claim 1, wherein the welding protrusions (101) are distributed in a matrix shape on the steel sheet (1).

4. The composite bus bar for battery modules according to claim 1, wherein at least three of the engaging holes (102) are formed at the periphery of each of the welding protrusions (101).

5. The composite bus bar for battery modules according to claim 1, wherein six engaging holes (102) are disposed at the periphery of each welding protrusion (101), and the six engaging holes (102) are uniformly spaced around the welding protrusion (101).

6. The composite bus bar for battery modules according to claim 1, wherein the aluminum sheet (2) is formed with through-holes (202) corresponding one-to-one to the positions of the respective welding protrusions (101).