CN110048050B

CN110048050B - Battery pack

Info

Publication number: CN110048050B
Application number: CN201910319428.5A
Authority: CN
Inventors: 吴昌生; 陶志; 林贤日
Original assignee: Dongfeng Motor Co Ltd
Current assignee: Dongfeng Motor Co Ltd
Priority date: 2019-04-19
Filing date: 2019-04-19
Publication date: 2022-03-04
Anticipated expiration: 2039-04-19
Also published as: CN110048050A

Abstract

The invention discloses a battery pack which comprises an upper shell and a lower shell, wherein the upper edge of the upper shell is connected with the lower edge of the lower shell, the lower shell comprises a bottom plate, a left side beam, a right side beam, a front cross beam and a rear cross beam, and the left side beam, the right side beam, the front cross beam and the rear cross beam are positioned on the bottom plate and form a quadrilateral frame. The invention provides a battery pack which is strong in performance robustness and excellent in light weight effect.

Description

Battery pack

Technical Field

The invention relates to the technical field of batteries, in particular to a battery pack.

Background

The battery pack is used for being mounted on a lower automobile body of the electric automobile and providing bearing for a battery of the electric automobile. As an important part of an electric vehicle, a battery pack requires comprehensive consideration of various properties. For example: reasonable space fit, strength, impact resistance, durability, water tightness, and the like.

The existing battery pack is difficult to keep higher lightweight level under the condition of meeting the requirements, so that a battery pack with strong performance robustness and more excellent lightweight effect needs to be designed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a battery pack with strong performance robustness and more excellent light weight effect.

The technical scheme of the invention provides a battery pack which comprises an upper shell and a lower shell, wherein the upper edge of the upper shell is connected with the lower edge of the lower shell, the lower shell comprises a bottom plate, a left side beam, a right side beam, a front cross beam and a rear cross beam which are positioned on the bottom plate, and the left side beam, the right side beam, the front cross beam and the rear cross beam form a quadrilateral frame.

Further, the upper housing comprises a front end upper cover and a main body upper cover, and the front end upper cover is positioned on the front side of the main body upper cover;

the lower shell further comprises a front end lower cover, the front end lower cover is located on the front side of the front cross beam, the front end upper cover is buckled on the front end lower cover, and the main body upper cover is buckled on a quadrilateral frame formed by the left side beam, the right side beam, the front cross beam and the rear cross beam in a surrounding mode.

Furthermore, the front end lower cover comprises a front end cover, front end baffle plates, front end side plates and a front end bottom plate, the front end baffle plates are located at the front ends of the two front end side plates, the front end cover is located above the front end baffle plates, the front end baffle plates and the front end side plates are located above the front end bottom plate, an installation window is formed in the front end upper cover, and the front end cover is inserted into the installation window.

Furthermore, a left wing plate extends out of the left side beam towards the bottom plate along the transverse direction, a right wing plate extends out of the right side beam towards the bottom plate along the transverse direction, the left wing plate is welded with the left side edge of the bottom plate to form a left welding line, and the right wing plate is welded with the right side edge of the bottom plate to form a right welding line.

Further, the lower shell further comprises a middle cross beam, wherein the middle cross beam is connected between the left side beam and the right side beam and is positioned on the upper surfaces of the left wing plate, the bottom plate and the right wing plate.

Furthermore, a plurality of upper mounting holes are formed in the upper edge at intervals, a plurality of lower mounting holes are formed in the lower edge at intervals, a rivet nut is mounted in each lower mounting hole and comprises a threaded sleeve and a flange end, the threaded sleeve is inserted into each lower mounting hole, and the flange end is located on the top surface of the lower edge;

the battery pack further comprises a sealing piece and a bolt, the sealing piece is arranged between the upper edge and the lower edge, the bolt penetrates through the upper mounting hole and the flange end and then is connected with the threaded sleeve, and after the sealing piece is compressed, the upper end face of the flange end is in contact with the bottom face of the lower edge.

Further, the upper edge is a turned-over edge, and the outer side of the turned-over edge inclines towards the lower edge and covers the lower edge.

Further, the outer wall surfaces of the left side beam and the right side beam extend outwards to form continuous side skirts.

Further, the side skirt has a thickness smaller than thicknesses of the left and right side members.

Furthermore, an explosion-proof valve port is arranged on the upper shell.

Furthermore, a maintenance opening is formed in the upper shell.

After adopting above-mentioned technical scheme, have following beneficial effect:

in one embodiment of the invention, the left and right welds are moved inward by extending the left and right wing panels laterally toward the base plate such that a plurality of lateral structural members or structural members within the battery can span the welds, reducing the risk of cracking of the weakened region.

In another embodiment of the invention, the compression amount of the sealing strip is flexibly limited by the height of the flange end of the blind rivet nut through the mutual matching of the sealing element, the bolt and the blind rivet nut, so that the water sealing performance of the battery pack shell is reliable and the battery pack shell has good maintainability and economical efficiency.

In another embodiment of the invention, the continuous side skirt extends outwards from the outer wall surfaces of the left side beam and the right side beam, when the battery pack shell is laterally collided, the collided object contacts the side skirt firstly, the side skirt provides counter force for the collided object in advance, the collision starting point is far away from the battery module compared with a structure without the side skirt, the side skirt absorbs energy in the collapsing and deforming process, the pressure resistance of the side wall is improved, and the inner module is protected.

Drawings

The disclosure of the present invention will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present disclosure. In the figure:

FIG. 1 is an exploded view of an upper housing and a lower housing in one embodiment of the invention;

FIG. 2 is a perspective view of the lower housing in one embodiment of the present invention;

FIG. 3 is an exploded view of FIG. 2;

FIG. 4 is a perspective view of the lower housing with the module mounted thereon in accordance with one embodiment of the present invention;

FIG. 5 is a top view of the lower housing in an embodiment of the present invention;

FIG. 6 is an enlarged partial view of FIG. 5;

FIG. 7 is an enlarged view of a portion of the lower housing in an embodiment of the present invention;

FIG. 8 is a partial cross-sectional view of the junction of the upper housing and the lower housing in one embodiment of the invention;

FIG. 9 is a top view of the lower housing in an embodiment of the present invention;

FIG. 10 is a schematic view of a crash test of the lower housing in an embodiment of the present invention;

FIG. 11 is a partial cross-sectional view of the lower housing in an embodiment of the invention.

Reference symbol comparison table:

upper casing 1, lower casing 2, rivet nut 3 and sealing element 4

Bolt 5 module front and rear support 6 module front and rear plate 7 upper edge 11

Upper mounting hole 12 front end upper cover 13 main body upper cover 14 explosion-proof valve port 15

Maintenance opening 16 bottom plate 21 left side beam 22 right side beam 23

Middle beam 24 rear beam 25 lower edge 26 small beam 27

Front cross beam 28 front end lower cover 29 screw sleeve 31 flange end 32

Outer seal strip 41 and inner seal strip 42 side skirt 10 transition structure 20

Window 131 mounting left weld 211 for entire package of mounting hole 101 of impact object 30

Right weld 212, left wing panel 221, right wing panel 231, rear wing panel 251

Front end baffle 292 of front cover 291 of front wing plate 281 of lower mounting hole 261

Front end side plate 293 front end bottom plate 294

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings.

It is easily understood that according to the technical solution of the present invention, those skilled in the art can substitute various structures and implementation manners without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as limiting or restricting the technical aspects of the present invention.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.

As shown in fig. 1-2, the battery pack includes an upper case 1 and a lower case 2, an upper edge of the upper case 1 is connected to a lower edge of the lower case 2, the lower case 2 includes a bottom plate 21, and a left side member 22, a right side member 23, a front cross member 28, and a rear cross member 25 which are positioned on the bottom plate 21, and the left side member 22, the right side member 23, the front cross member 28, and the rear cross member 25 enclose a quadrangular frame.

Further, as shown in fig. 1-2, the upper case 1 includes a front end upper cover 13 and a main body upper cover 14, the front end upper cover 13 being located on the front side of the main body upper cover 14;

the lower case 2 further includes a front end lower cover 29, the front end lower cover 29 is located on the front side of the front cross member 28, the front end upper cover 13 is fastened to the front end lower cover 29, and the main body upper cover 14 is fastened to a quadrangular frame surrounded by the left side member 22, the right side member 23, the front cross member 28, and the rear cross member 25.

Further, as shown in fig. 3, the front end lower cover 29 includes a front end cover 291, a front end baffle 292, a front end side plate 293 and a front end bottom plate 294, the front end baffle 292 is located at the front end of the two front end side plates 293, the front end cover 291 is located above the front end baffle 292, the front end baffle 292 and the front end side plate 293 are located above the front end bottom plate 294, the front end upper cover 13 is opened with a mounting window 131, and the front end cover 291 is inserted into the mounting window 131.

Further, as shown in fig. 1, the upper case 1 is provided with an explosion-proof valve port 15 to prevent water or mud below from being embedded into the battery pack.

Further, as shown in fig. 1, a maintenance opening 16 is formed in the upper housing 1, and a detachable maintenance cover (not shown) is mounted on the maintenance opening 16, so that maintenance is facilitated.

Further, as shown in fig. 2-3, the lower shell includes a bottom plate 21, a left side beam 22 and a right side beam 23, the left side beam 22 extends a left wing plate 221 in a transverse direction towards the bottom plate 21, the right side beam 23 extends a right wing plate 231 in a transverse direction towards the bottom plate 21, the left wing plate 221 is welded to the left side of the bottom plate 21 to form a left welding seam 211, and the right wing plate 231 is welded to the right side of the bottom plate 21 to form a right welding seam 212.

Here, the "lateral direction" means that the left wing panel 221 and the right wing panel 231 are located on the same horizontal plane as the bottom panel 21 in the horizontal direction in fig. 3.

The conventional left and

right side members

22 and 23 are not provided with transversely extending flanges, and are directly welded to the left and right sides of the bottom plate 21, so that the weld is located at the turning line and is easily cracked.

In the present embodiment, the left wing plate 221 and the right wing plate 231 are extended laterally toward the bottom plate 21, and the left welding seam 211 and the right welding seam 212 are moved inward toward the center of the bottom plate 1, so that a plurality of lateral structural members or functional members in the battery pack case span the left welding seam 211 and the right welding seam 212, and the risk of cracking of the weak region is reduced.

Further, as shown in fig. 2 to 3, the lower case further includes a middle cross member 24, and the middle cross member 24 is connected between the left side member 22 and the right side member 23 and is located on the upper surfaces of the left wing plate 221, the bottom plate 21, and the right wing plate 231.

The center cross member 24 spans the left weld joint 211 and the right weld joint 212, reducing the risk of cracking in the weakened weld area.

Further, as shown in fig. 3, the lower shell further includes a rear cross member 25, the rear cross member 25 extends out of a rear wing plate 251 in the transverse direction toward the bottom plate 21, and the rear wing plate 251 is welded to the rear side edge of the bottom plate 21;

as shown in fig. 4, the module front and rear plates 7 are mounted between the intermediate cross member 24 and the rear cross member 25, and the module front and rear brackets 6 are provided at the bottom of the module front and rear plates 7 for mounting the module front and rear plates 7 to the floor 21.

As shown in fig. 5 to 6, a module front and rear bracket 6 is installed between the middle cross member 24 and the rear cross member 25, and the module front and rear bracket 6 is located on the upper surfaces of the left wing plate 221, the bottom plate 21, and the right wing plate 231 and is connected to the left wing plate 221, the bottom plate 21, and the right wing plate 231 by bolts.

Wherein the weld between the rear wing panel 251 and the base plate 21 is also offset towards the center of the base plate 21, reducing the risk of weld cracking.

The module front and rear brackets 6 also span the left weld 211 and the right weld 212, reducing the risk of cracking of the weak weld area.

Further, as shown in fig. 2, the lower case 2 further includes a small beam 27, one end of the small beam 27 is connected to the left side beam 22 or the right side beam 23, and the other end of the small beam 27 presses on the left weld 22 or the right weld 3.

The small beam 27 also spans either the left weld 211 or the right weld 212, reducing the risk of cracking of the weakened weld area.

In this embodiment, as shown in fig. 3, the bottom plate 21 includes four pieces, and the left sides of the four pieces of bottom plate 21 are all welded to the left wing plate 221, and the right sides are all welded to the right wing plate 231.

Further, as shown in fig. 3, the lower case 2 further includes a front cross member 28, the front cross member 28 extends in a lateral direction toward the bottom plate 21 to form a front wing 281, and the front wing 281 is welded to a front side edge of the bottom plate 21.

The weld between the front wing panel 281 and the base plate 21 is also offset towards the centre of the base plate 21, reducing the risk of weld cracking.

Further, the left wing plate 221 is integrally formed with the left side member 22, and the right wing plate 231 is integrally formed with the right side member 23. The width of the left wing plate 221 is smaller than the width of the entire bottom plate 21, and the width of the right wing plate 231 is smaller than the width of the entire bottom plate 21. Left wing panel 221 and right wing panel 231 extend only a small amount toward the center or inside of base panel 21, thereby offsetting left weld joint 211 and right weld joint 212 inwardly and not replacing the function of base panel 21.

Further, as shown in fig. 1 and 8, a plurality of upper mounting holes 12 are formed at intervals on the upper edge 11, a plurality of lower mounting holes 261 are formed at intervals on the lower edge 26, a blind rivet nut 3 is mounted in the lower mounting holes 261, the blind rivet nut 3 includes a threaded sleeve 31 and a flange end 32, the threaded sleeve 31 is inserted into the lower mounting holes 261, and the flange end 32 is located on the top surface of the lower edge 26;

the battery pack shell further comprises a sealing member 4 and a bolt 5, wherein the sealing member 4 is arranged between the upper edge 11 and the lower edge 26, after the bolt 5 penetrates through the upper mounting hole 12 and the flange end 32 and is connected with the threaded sleeve 31, after the sealing member 4 is compressed, the upper end face of the flange end 32 is contacted with the bottom surface of the lower edge 26.

As shown in fig. 1, the upper edge 11 is continuously distributed on the outer periphery of the upper casing 1, the lower edge 26 is continuously distributed on the outer side of the lower casing 2, and the upper casing 1 is fastened to the lower casing 2 and connected by the bolt 5.

During assembly, as the bolt 5 is continuously screwed into the threaded sleeve 31, the distance between the upper edge 11 and the lower edge 26 is gradually reduced, the upper edge 11 and the lower edge 26 continuously compress the sealing element 4 until the upper end face of the flange end 32 is contacted with the bottom surface of the upper edge 11, the bolt 5 cannot be continuously screwed downwards, the sealing element 4 keeps a certain compression amount, and a good water sealing effect is achieved on a gap between the upper edge 11 and the lower edge 26.

Further, as shown in fig. 8, the seal 4 includes an outer seal strip 41 and an inner seal strip 42, the outer seal strip 41 being located outside the flange end 32, and the inner seal strip 42 being located inside the flange end 32.

The outer seal strip 41 and the inner seal strip 42 form double-layer sealing protection, and further enhance the water sealing performance.

Alternatively, the sealing member 4 may also have only one outer sealing strip 41, or only one inner sealing strip 42, or more than two outer sealing strips 41, or more than two inner sealing strips 42.

Preferably, the sealant 4 is sealed with a glue strip between the flange end 32 to further reduce the ingress of moisture into the battery can.

Further, as shown in fig. 8, the upper edge 11 is a cuff, the outside of which is inclined towards the lower edge and covers the lower edge 26.

The seal 4 is located between the flange and the lower edge 26, the inclined downwardly outer side of the flange serving to reduce the gap with the lower edge 26 and reduce the amount of water entering.

Preferably, the outer side of the cuff extends laterally outwardly beyond the lower edge by 0-2 cm. Here, "lateral" refers to the left-right direction in fig. 8. The outer side of the flange extends laterally beyond the lower edge to shield the gap between the upper edge 11 and the lower edge 26 and reduce the amount of water entering.

Further, as shown in fig. 7, the lower edge 26 has a rectangular frame shape in cross section, and a lower mounting hole 261 is formed in the top surface of the lower edge 26. The lower edge 26 of the rectangular frame has a height that facilitates the mounting of the blind rivet nut 3.

Alternatively, the rectangular frame has a width of 26-36cm, which facilitates sufficient mounting positions for the bolt 5, the blind rivet nut 3 and the seal 4.

Further, rivet nut 3 is hexagonal rivet nut, is favorable to relapseing the dismouting maintenance and can not loosen.

Further, the height of the seal member 4 after compression is 2 to 3cm, ensuring sufficient sealing performance.

Furthermore, as shown in fig. 11, the outer wall surface of the side beam extends outwards to form a continuous side skirt 10, the thickness H1 of the side skirt 10 is smaller than the thickness H2 of the side beam, and the thickness of the side skirt is preferably 10-30 mm.

In this embodiment, as shown in fig. 9, the side skirt 10 extends outward from the outer wall surfaces of the left side member 22 and the right side member 23.

As shown in fig. 10, in the collision test, the collision object 30 contacts the side skirt 10 first, the side skirt 10 provides a reaction force to the collision object 30 in advance, and the side skirt 10 absorbs pressure in the collapsing deformation process, so that the pressure resistance of the side wall is increased, and the internal battery module is protected. In addition, the smaller thickness of the side skirt can provide larger counter force and energy absorption, and the higher compression resistance can be improved by increasing smaller weight.

Further, as shown in fig. 9, the side skirts 10 are continuously formed on the outer wall surfaces of the left and

right side members

22 and 23, respectively. The side skirt 10 is provided with a plurality of mounting holes 101 at intervals.

The side skirt 10 formed continuously can increase the pressure resistance, and the side skirt 10 is provided with a whole package mounting hole 101 which can replace the existing lifting lug.

Further, as shown in fig. 10, the side skirt 10 and the right side beam 23 are connected by a transition structure 20, and the cross section of the transition structure 20 includes at least one triangular frame.

The triangular frame can stably support the side skirt 10. In addition, the triangular frame distributes pressure to the side walls and the bottom plate of the side sill in a large area during a collision test, and deformation of the side sill can be reduced.

Further, as shown in fig. 10, the cross-section of the side skirt 10 includes at least one rectangular frame. The side skirt 10 also includes a triangular frame.

Optionally, the wall thickness of the rectangular frame of the side skirt 10 is 2mm, which is beneficial to light-weight battery pack case.

Further, as shown in fig. 10, the cross section of the right side member 23 includes three rectangular frames.

Optionally, the cross-section of the side beam may further comprise at least two rectangular frames.

Further, as shown in FIG. 11, the distance H between the lower surface of the side skirt 10 and the lower surface of the right side member 23 is 0 to 25 mm.

The side skirt 10 is located at a position corresponding to the collision object 30 within the range, and can receive the pressure of the collision object 30.

Further, as shown in fig. 11, the side skirt 10 has a width W of 55 to 80 mm. The side skirt 10 has a sufficient width to perform a better pressure absorbing function and reduce the influence on the side member.

According to the invention, the left wing plate and the right wing plate transversely extend towards the bottom plate, and the left welding seam and the right welding seam are moved inwards, so that a plurality of transverse structural members or structural members in the battery can shell body cross the welding seams, and the cracking risk of the weak area is reduced.

According to the invention, through the mutual matching of the sealing element, the bolt and the rivet nut, the compression amount of the sealing strip is flexibly limited by the height of the flange end of the rivet nut, so that the water sealing performance of the battery pack shell is reliable, and the battery pack shell has good maintainability and economical efficiency.

According to the invention, the continuous side skirt extends outwards from the outer wall surfaces of the left side beam and the right side beam, when the battery pack shell is laterally collided, the collided object contacts the side skirt firstly, the side skirt provides counter force for the collided object in advance, the collision starting point is far away from the battery module compared with a structure without the side skirt, the side skirt absorbs energy in the process of collapsing and deforming, the pressure resistance of the side wall is improved, and the internal module is protected.

The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.

Claims

1. A battery pack comprising an upper case and a lower case, an upper edge of the upper case being connected to a lower edge of the lower case,

the lower shell comprises a bottom plate, and a left side beam, a right side beam, a front cross beam and a rear cross beam which are positioned on the bottom plate, the left side beam, the right side beam, the front cross beam and the rear cross beam form a quadrilateral frame in a surrounding manner, and continuous side skirts extend outwards from the outer wall surfaces of the left side beam and the right side beam;

the left side beam extends towards the bottom plate along the transverse direction to form a left wing plate, the right side beam extends towards the bottom plate along the transverse direction to form a right wing plate, the left wing plate and the left side beam are integrally formed, the right wing plate and the right side beam are integrally formed, the left wing plate and the left side edge of the bottom plate are welded to form a left welding line, the right wing plate and the right side edge of the bottom plate are welded to form a right welding line, the left welding line and the right welding line are moved inwards towards the center of the bottom plate, and therefore a plurality of transverse structural members or structural members in the battery cladding body can cross the welding line;

the front cross beam extends out of a front wing plate towards the bottom plate along the transverse direction, the front wing plate is welded with the front side edge of the bottom plate, and a welding seam between the front wing plate and the bottom plate is also deviated towards the center of the bottom plate;

the rear cross beam extends towards the bottom plate along a transverse direction to form a rear wing plate, the rear wing plate is welded with the rear side edge of the bottom plate, and a welding seam between the rear wing plate and the bottom plate is also deviated towards the center of the bottom plate.

2. The battery pack according to claim 1, wherein the upper case includes a front end upper cover and a main body upper cover, the front end upper cover being located at a front side of the main body upper cover;

3. The battery pack according to claim 2, wherein the front end lower cover includes a front end cover, a front end baffle, front end side plates, and a front end bottom plate, the front end baffle is located at the front end of the two front end side plates, the front end cover is located above the front end baffle, the front end baffle and the front end side plates are located above the front end bottom plate, the front end upper cover is provided with a mounting window, and the front end cover is inserted into the mounting window.

4. The battery pack of claim 1, wherein the lower housing further comprises a middle cross member connected between the left and right side members and located on upper surfaces of the left wing panel, the bottom panel, and the right wing panel.

5. The battery pack according to claim 1, wherein the upper edge has a plurality of upper mounting holes spaced apart from each other, the lower edge has a plurality of lower mounting holes spaced apart from each other, the lower mounting holes have rivet nuts mounted therein, the rivet nuts include threaded sleeves inserted into the lower mounting holes, and flange ends located on top surfaces of the lower edges;

6. The battery pack according to claim 5, wherein the upper edge is a burring, and an outer side of the burring is inclined toward the lower edge and covers the lower edge.

7. The battery pack of claim 1, wherein the side skirt has a thickness that is less than a thickness of the left and right side beams.

8. The battery pack of any one of claims 1-7, wherein the upper housing defines an explosion-proof valve opening.

9. The battery pack according to any one of claims 1 to 7, wherein the upper case is provided with a service opening.