CN210576186U

CN210576186U - High-voltage copper bar structure in power battery pack

Info

Publication number: CN210576186U
Application number: CN201922053901.8U
Authority: CN
Inventors: 陆珂伟; 刘怡; 闫天佐; 季迪轩; 李勇君
Original assignee: Shanghai Advanced Traction Battery Systems Co Ltd
Current assignee: Shanghai Advanced Traction Battery Systems Co Ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-05-19
Anticipated expiration: 2029-11-25

Abstract

The utility model discloses a high pressure copper bar structure in power battery package, including soft copper bar and hard copper bar, soft copper bar piles up by a plurality of layers of soft copper paper tinsel and constitutes, through unsmooth snap-fit type assembly structure interconnect between the one end of soft copper bar and the one end of hard copper bar, has following advantage: 1) can satisfy the flexible deformation after certain generating heat, the good thermal diffusivity of soft copper bar can make the current-carrying capacity reliable and stable moreover. 2) The independent soft copper bar is bent difficultly, and required space is big, and the spatial arrangement degree of difficulty is high, and soft or hard combines the copper bar accessible rigid coupling to realize arranging under the compact condition in space for compact structure, space utilization is high. 3) The structure of the soft-hard combined copper bar has high precision, and can show the characteristic of soft connection or hard connection under different environmental requirements, so that the whole body is more reliable and beautiful. 4) The trapezoidal concave-convex structure processing is done to soft or hard copper bar butt welding department, and this special construction makes the welding department intensity higher, and resistant pulling power is bigger, and the structure is more reliable.

Description

High-voltage copper bar structure in power battery pack

Technical Field

The utility model belongs to the technical field of the technique of high-pressure copper bar and specifically relates to a high-pressure copper bar structure in power battery package, its mechanical connection structure of in particular to.

Background

The rapid increase of new forms of energy power battery loading volume shows that the demand market in this aspect is wide, and wherein higher energy density, more electric quantity also receive whole car end's favor more easily, and this often means that the module of power battery package inside arranges more densely, and the space of high-low pressure circuit is narrower. At present, a conventional high-voltage loop mainly has two connection modes of a hard copper bar and a soft copper bar, but the hard copper bar has high requirement on the precision of a mounting hole position, is easy to vibrate and crack after the length reaches a certain range, has high heat generation amount, and easily influences the self current-carrying performance and the service life of a battery cell; the soft copper bar has the defects of high space requirement, difficult arrangement, low forming precision, easy deformation and the like. In order to avoid the problems, the soft and hard copper bars can be combined to form a certain purpose by combining the respective advantages of the soft and hard copper bars.

Disclosure of Invention

The utility model aims at providing a high-pressure copper bar structure in power battery package combines soft or hard copper bar to connect different characteristics, improves the copper bar and gives out heat, improves space utilization, reduces and arranges the degree of difficulty, increases high-pressure protection safety, in order to overcome the defect that above-mentioned prior art exists and not enough.

In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides a high-pressure copper bar structure in power battery package, including soft copper bar and hard copper bar, soft copper bar piles up by a plurality of layers of soft copper foil and constitutes, through unsmooth joint formula assembly structure interconnect between the one end of soft copper bar and the one end of hard copper bar, hard copper bar outside forms epoxy resin layer, resistant high pressure pyrocondensation pipe has been cup jointed to the outside of soft copper bar, soft copper bar other end forms soft copper bar connection port, the port department of should locating posts the nickel piece, and weld multilayer copper foil together through polymer diffusion welding, hard copper bar other end forms hard copper bar connection port, this department port department surface nickel plating 5-8um, the bolt hole has all been seted up to soft copper bar connection port and hard copper bar connection port department.

The utility model discloses a high-pressure copper bar structure in power battery package, excellent compare with prior art, the utility model has the advantages of it is following:

1) the common hard copper bar is connected and is calorific capacity big in general power battery package now, and soft or hard combines the copper bar and can improve this, can satisfy the flexible deformation of back of generating heat certainly, and the good thermal diffusivity of soft copper bar can make the current-carrying capacity reliable and stable moreover.

2) The independent soft copper bar is bent difficultly, and required space is big, and the spatial arrangement degree of difficulty is high, and soft or hard combines the copper bar accessible rigid coupling to realize arranging under the compact condition in space for compact structure, space utilization is high.

3) The structure of the soft-hard combined copper bar has high precision, and can show the characteristic of soft connection or hard connection under different environmental requirements, so that the whole body is more reliable and beautiful.

4) The trapezoidal concave-convex structure processing is done to soft or hard copper bar butt welding department, and this special construction makes the welding department intensity higher, and resistant pulling power is bigger, and the structure is more reliable.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is the schematic diagram of the concave-convex snap-on assembling structure of the present invention.

Wherein: 1. soft copper bars; 2. hard copper bars; 3. a soft copper bar connecting port; 4. a hard copper bar connection port; 5. bolt holes; 6. an inverted trapezoidal tab portion; 7. a recessed portion; 8. a folding part; 9. and (4) cambered surface.

Detailed Description

The technical solution in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.

The utility model discloses a high-pressure copper bar structure in power battery package, as shown in FIG. 1, it lies in different from prior art: including soft copper bar 1 and hard copper bar 2, soft copper bar 1 piles up by a plurality of layers of soft copper foil and constitutes, through unsmooth joint formula assembly structure interconnect between the one end of soft copper bar 1 and the one end of

hard copper bar

2, 2 outside formation epoxy layers of hard copper bar, high pressure resistant pyrocondensation pipe has been cup jointed to the outside of soft copper bar 1, the 1 other end of soft copper bar forms soft copper bar connection port 3, the port department of this department has pasted the nickel piece, and weld multilayer copper foil together through polymer diffusion welding, the 2 other ends of hard copper bar form hard copper bar connection port 4, the port department surface nickel plating 5-8um, bolt hole 5 has all been seted up in soft copper bar connection port 3 and hard copper bar connection port 4 department.

In specific implementation, the thickness of the soft copper foil is 0.08mm-0.3 mm. Preferably, the thickness of the soft copper foil is 0.1 mm.

In specific implementation, the thickness of the epoxy resin layer is 0.4 mm-0.7 mm.

When specifically implementing, unsmooth block-type assembly structure is including setting up at the trapezoidal tab portion 6 that falls of soft copper bar 1 one end and setting up the depressed part 7 in 2 one ends of hard copper bar, and the shape of this depressed part 7 cooperatees with the shape of the trapezoidal tab portion 6 that falls, and the 6 block of the trapezoidal tab portion that falls assembles in depressed part 7 to weld soft copper bar 1 and hard copper bar 2 together through laser welding.

During specific implementation, the soft copper bar is provided with a turnover part 8, the turnover part 8 is provided with a cambered surface 9 structure, and the soft copper bar is turned over at the turnover part 8 by 180 degrees.

In specific implementation, the hard copper bar is provided with a bending part 10 at a position close to the hard copper bar connecting port 4, the bending angle of the bending part is 5-7 degrees, and a reverse acting force is provided after the bolt is fastened to prevent the bolt from loosening.

The technical effects are as follows:

(1) the structure adopts the combined application of soft and hard copper bars;

(2) compared with a pure soft copper bar, the part of the product, which is connected with the hard copper bar, has the advantages of easy structure forming, convenient arrangement and high space utilization rate;

(3) the hard copper bar connecting part can be formed by punching by a machine, the precision is high, and the bent part is neat and beautiful;

(4) the butt welding positions of the soft and hard copper bars are made into trapezoidal structures for butt joint, so that the local structure is reinforced, and the welding strength is higher;

(5) compared with a pure hard copper bar, the product has better heat dissipation performance and higher current-carrying capacity due to the existence of the soft copper foil;

(6) the soft copper bar connecting part has better buffering performance, can absorb more stress without influencing the self overcurrent capacity, and is safer and more reliable;

(7) the soft copper bar connecting part is flexible to install and more convenient to assemble;

(8) the soft and hard combined copper bar arrangement scheme is more flexible, the soft and hard connection position of the copper bar is adjustable, and the copper bar can be more suitable for the space in the current complex battery pack.

The working principle is as follows:

1. the product is formed by welding a soft copper bar and a hard copper bar, wherein the soft connection is formed by cutting a copper foil with the thickness of 0.1mm, stacking into a plurality of layers, and then trimming, punching and molding. The hard connection is formed by punching, bending and other processes on a copper material with a certain thickness.

2. Port contact surface: and adhering nickel sheets on the soft connection surface, welding multiple layers of copper foils together by adopting high-molecular diffusion welding, and then performing surface polishing treatment. The hard connecting surface is plated with nickel of 5-8 um. The port contact surfaces of the soft copper bar and the hard copper bar are connected with the outside in a locking bolt mode and are electrified.

3. And (3) butt welding of soft and hard joints: the soft and hard copper bars are welded together by laser welding, and the soft and hard copper bars at the butt welding position adopt a trapezoidal concave-convex structure to strengthen local strength.

4. Insulating protection: in order to isolate the influence of voltage from the external environment, epoxy resin powder with the flame retardant grade meeting VW-1 grade and the thickness of 0.4-0.7mm is sprayed on the surface of the joint of the hard copper bar, and the hard copper bar can resist 3500V voltage and 60S without breakdown. The connection surface of the soft copper bar is covered with a flame-retardant and high-pressure-resistant heat-shrinkable sleeve.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a high-pressure copper bar structure in power battery package which characterized in that: including soft copper bar (1) and hard copper bar (2), soft copper bar (1) is piled up by a plurality of layers of soft copper foil and is constituted, through unsmooth joint formula assembly structure interconnect between the one end of soft copper bar (1) and the one end of hard copper bar (2), hard copper bar (2) outside forms the epoxy layer, the high pressure resistant pyrocondensation pipe has been cup jointed to the outside of soft copper bar (1), soft copper bar (1) other end forms soft copper bar connection port (3), this port department posts the nickel piece, and weld the multilayer copper foil together through polymer diffusion welding, hard copper bar (2) other end forms hard copper bar connection port (4), this department's port department surface nickel plating 5-8um, bolt hole (5) have all been seted up in soft copper bar connection port (3) and hard copper bar connection port (4) department.

2. The internal high-voltage copper bar structure of the power battery pack as claimed in claim 1, wherein: the thickness of the soft copper foil is 0.08mm-0.3 mm.

3. The internal high-voltage copper bar structure of the power battery pack as claimed in claim 2, wherein: the thickness of the soft copper foil is 0.1 mm.

4. The internal high-voltage copper bar structure of the power battery pack as claimed in claim 1, wherein: the thickness of the epoxy resin layer is 0.4 mm-0.7 mm.

5. The internal high-voltage copper bar structure of the power battery pack as claimed in claim 1, wherein: unsmooth snap-fit assembly structure is including setting up at the trapezoidal tab portion of falling (6) of soft copper bar (1) one end and setting up depressed part (7) in hard copper bar (2) one end, and the shape of this depressed part (7) cooperatees with the shape of falling trapezoidal tab portion (6), falls trapezoidal tab portion (6) block and assembles in depressed part (7) to weld soft copper bar (1) and hard copper bar (2) together through laser welding.