CN212113863U

CN212113863U - Power battery pack and shell thereof

Info

Publication number: CN212113863U
Application number: CN202021262000.6U
Authority: CN
Inventors: 陈许超; 任荣彬; 张海建; 唐丽娟; 王博文; 樊少泽; 周月; 曲凡多
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2020-12-08
Anticipated expiration: 2030-06-30

Abstract

The utility model relates to the technical field of vehicles, in particular to shell and power battery package of power battery package. The shell includes explosion-proof valve and the casing that has the cavity, the casing is including keeping spaced inlayer lateral wall and outer lateral wall, outer lateral wall has the outer hole in order to assemble explosion-proof valve, inlayer lateral wall have with the hole of outer hole dislocation set, so that the cavity can pass through the hole outer lateral wall and inboard between the lateral wall the clearance with explosion-proof valve intercommunication. The shell of the power battery pack is provided with an inner hole on the inner side wall, an outer hole on the outer side wall and staggered arrangement of the inner hole and the outer hole, so that once a failure module is arranged in a cavity of the shell, a large amount of generated heat and flame enter into a gap between the outer side wall and the inner side wall through the inner hole to be cooled, and the safety performance of the power battery pack is optimized.

Description

Power battery pack and shell thereof

Technical Field

The utility model relates to the technical field of vehicles, in particular to shell and power battery package of power battery package.

Background

With the national vigorous popularization of new energy fields, electric vehicles have become the mainstream trend in the future. The power battery pack is used as a power supply component which is the most core of the whole vehicle, and determines key indexes of driving range, cost, service life, safety, maintainability and the like of the whole vehicle.

Currently, power battery packs comprise a casing having a cavity and a plurality of modules housed in the cavity. When the power battery package moves, in case the module breaks down, then can produce a large amount of heats in the twinkling of an eye, cause the thermal runaway to appear in the cavity of casing, if this part of heat of unable in time discharging, cause the power battery package to explode in the twinkling of an eye easily, the security is very poor.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a power battery pack and a housing thereof, so as to solve the safety problem of the power battery pack in the prior art that is prone to instantaneous explosion when thermal runaway occurs.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a shell of power battery package, the shell includes explosion-proof valve and the casing that has the cavity, the casing is including keeping spaced inlayer lateral wall and outer lateral wall, outer lateral wall has the outer hole in order to assemble explosion-proof valve, inlayer lateral wall have with the hole of outer hole dislocation set, so that the cavity can pass through the hole outer lateral wall and inboard between the lateral wall clearance with explosion-proof valve intercommunication.

Optionally, the housing includes a fire filtering structure mounted at the inner bore for filtering the flame sprayed in the chamber.

Optionally, the fire filtering structure is a metal filter screen.

Optionally, the casing includes bottom plate, last casing and boundary beam, the boundary beam is encloses the frame structure and the relative both sides that set up have an opening, the bottom plate with go up the casing and install respectively the both sides of boundary beam the opening is in order to form jointly the cavity, inlayer lateral wall and outer lateral wall do two lateral walls of boundary beam, the hole with outer hole is in dislocation set in the thickness direction of boundary beam.

Optionally, in the circumferential direction of the edge beam, the inner-layer side wall includes a plurality of inner holes respectively disposed at both sides of the outer hole.

Optionally, the upper housing includes a reinforcing frame and a plurality of cover plates, the plurality of cover plates are mounted together by the reinforcing frame, and the strength of the reinforcing frame is greater than that of the cover plates.

Optionally, the reinforcing frame includes a transverse rib and a pair of longitudinal ribs, the pair of longitudinal ribs are spaced and arranged oppositely, the upper side wall of the longitudinal rib includes a bending portion bent in the height direction of the upper housing, and two ends of the transverse rib are connected to the bending portions of the pair of longitudinal ribs respectively.

Optionally, the upper side and the lower side of the transverse rib are respectively provided with outward flanges turned in opposite directions.

Optionally, the longitudinal rib includes a plurality of bent portions that maintain an interval, and the reinforcing frame includes a plurality of the transverse ribs that are disposed in one-to-one correspondence with the plurality of bent portions.

The utility model discloses the second aspect still provides a power battery package, power battery package includes power battery package's shell.

Compared with the prior art, power battery package's shell and power battery package have following advantage:

the shell of power battery package sets up the hole through setting up on the inlayer lateral wall, sets up the outer hole on outer lateral wall to hole and outer hole dislocation set, in this way, in case the module breaks down in the cavity of casing, a large amount of heats and the flame of production can be cooled down by the cavity through the clearance department that the hole entered into between outer lateral wall and the inboard lateral wall and handle, compare in the arrangement that explosion-proof valve and hole set up relatively, has prolonged flame and has spread the route to explosion-proof valve, make flame be in be difficult to stretch to explosion-proof valve under the cooling effect in clearance, guaranteed the normal use of explosion-proof valve, the heat that is favorable to the module production that breaks down can be in discharge via explosion-proof valve smoothly after the cooling in clearance, optimized the security performance of power battery package.

Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Drawings

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

fig. 1 is a schematic structural diagram of a housing of a power battery pack according to an embodiment of the present invention;

FIG. 2 is a schematic view of the assembly between the rocker and the base plate of FIG. 1, showing the assembly between the explosion proof valve and the fire filtering structure on the rocker;

FIG. 3 is a bottom view of the upper housing shown in FIG. 1;

FIG. 4 is a schematic structural view of a reinforcing frame of the upper casing shown in FIG. 3;

FIG. 5 is a schematic view of a pair of longitudinal ribs of the reinforcement cage shown in FIG. 4;

FIG. 6 is a schematic view of the left lateral rib of the reinforcement cage shown in FIG. 4;

FIG. 7 is a schematic view of the right lateral rib of the reinforcement cage of FIG. 4;

fig. 8 is a bottom view of the reinforcing cage shown in fig. 4.

Description of reference numerals:

1. a boundary beam; 2. an explosion-proof valve; 3. a reinforcing frame; 4. a transverse rib; 5. an inner bore; 6. a fire filtering structure; 7. a cover plate; 8. longitudinal ribs; 9. a base plate; 10. an upper housing; 11. a bending section; 12. and (5) outward flanging.

Detailed Description

In the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.

The utility model discloses a first aspect provides a shell of power battery package, as shown in fig. 1-8, the shell includes explosion-proof valve 2 and the casing that has the cavity, the casing is including keeping spaced inlayer lateral wall and outer lateral wall, outer lateral wall has the outer hole in order to assemble explosion-proof valve 2, the inlayer lateral wall have with outer hole dislocation set's hole 5, so that the cavity can pass through hole 5 clearance between outer lateral wall and the inboard lateral wall with explosion-proof valve 2 communicates. The explosion-proof valve can adopt various forms, such as a common explosion-proof valve, or a thimble type explosion-proof valve, and the double-layer metal net can be designed for a position control alignment and dislocation structure by adopting the design of the double-layer metal net.

Through the technical scheme, the utility model provides a shell and power battery package of power battery package, the shell of power battery package is through setting up hole 5 on the inlayer lateral wall, set up the outer hole on the outer lateral wall, and hole and outer hole dislocation set, so, in case the module breaks down in the cavity of casing, a large amount of heat and the flame that produce can enter the clearance department between outer lateral wall and the inboard lateral wall through the hole by the cavity and carry out the cooling process, compare in the explosion-proof valve and the relative arrangement mode that sets up of hole, increased the exhaust and the fire passageway of casing, prolonged the route that flame stretchs to explosion-proof valve 2, make flame difficult to stretch to explosion-proof valve 2 under the cooling effect in clearance, guaranteed the normal use of explosion-proof valve 2, be favorable to the heat that the module of breaking down produced can smoothly discharge via explosion-proof valve 2 after the cooling process in clearance, the escape time is more saved for passengers, and the safety performance of the power battery pack is optimized.

Further, as shown in fig. 2, the housing includes a fire filtering structure 6 installed at the inner hole 5 for filtering the flame sprayed in the chamber, which is beneficial to filtering out a part of the flame through the fire filtering structure 6, and prevents the flame in the chamber from being completely sprayed into the gap between the inner side wall and the outer side wall through the inner hole 5.

In order to simplify the overall structure who strains fiery structure 6, strain fiery structure and be the metal filter screen, be convenient for preparation and processing still are favorable to the lightweight design of power battery package. Further, the shell can also set up the metal ball (for example, the diameter is the metal ball about 0.1 mm) as straining fiery structure 6, and the metal ball stopper is in the clearance between inlayer lateral wall and the outer lateral wall and lie in between metal screen and the explosion-proof valve for metal screen, metal ball and the clearance can form three layers jointly and strain fiery structure, in order to carry out cooling treatment many times to the flame in the cavity, and then make flame can not stretch to explosion-proof valve department, that is to say, explosion-proof valve only need discharge unnecessary steam and smog can, be favorable to further improving fire extinguishing effect, guaranteed the security performance of power battery package.

As shown in fig. 1 and 2, the casing includes bottom plate 9, upper housing 10 and boundary beam 1, boundary beam 1 is to enclose the frame structure and the relative both sides that set up have an opening, bottom plate 9 with upper housing 10 is installed respectively the both sides of boundary beam 1 the opening is in order to form jointly the cavity, inlayer lateral wall and outer lateral wall do two lateral walls of boundary beam 1, hole 5 with the outer hole is in dislocation set in the thickness direction of boundary beam 1, through setting up boundary beam 1 to bilayer structure, has strengthened the bulk strength of the casing of power battery package, can also improve the security performance of power battery package after the thermal runaway to compromise the lightweight design of power battery package.

Further, in order to optimize the safety performance of the power battery pack after thermal runaway, the inner side walls of the inner layers are respectively arranged on two sides of the outer holes in the circumferential direction of the boundary beam 1, the structure is simple, the processing is convenient, and the whole weight of the power battery pack is reduced. Certainly, each inner hole 5 can be provided with a fire filtering structure to strengthen the fire extinguishing effect of the power battery pack and ensure the safe use of the explosion-proof valve. Of course, according to different actual requirements, the edge beam 1 can be provided with a plurality of outer holes in the circumferential direction of the edge beam to be respectively provided with the explosion-proof valves 2; in this case, one inner hole 5 may be provided, or a plurality of inner holes 5 may be provided, each of which is alternately arranged with a plurality of outer holes.

Compare in the easy emergence of the electric core of 811 system and explode in the twinkling of an eye and fire and cause the local fracture of upper casing and drill out the flame in the fracture department, this application is strengthened through having set up reinforcing frame 3 at the easy-to-crack position of upper casing. For example, the upper case 10 includes a reinforcing frame 3 and a plurality of cover plates 7, the plurality of cover plates 7 are mounted together through the reinforcing frame 3, and the strength of the reinforcing frame 3 is greater than that of the cover plates 7, so that the overall strength and light weight design of the upper case 10 are both considered, and the cost is reduced. The upper housing 10 may be made of various materials, for example, the reinforcing frame 3 is made of a metal plate, and the cover plate 7 is made of an SMC. It should be noted that the cover plate 7 may be assembled with the reinforcing frame 3 in various forms, for example, by using structural adhesive or welding, so as to reduce the assembly difficulty of the upper housing 10; fireproof cloth or fireproof foam can be adhered to the surface of the metal plate of the reinforcing frame 3, and fireproof performance is improved.

Further, as shown in fig. 4 to 8, the reinforcing frame 3 includes a transverse rib 4 and a pair of longitudinal ribs 8, the pair of longitudinal ribs 8 are spaced and arranged oppositely, an upper side wall of the longitudinal rib 8 includes a bending portion 11 bent in the height direction of the upper housing 10, and two ends of the transverse rib 4 are connected to the bending portions 11 of the pair of longitudinal ribs 8, respectively. Through being like network structure with reinforcing frame 3 as above, improved reinforcing frame 3 self structural strength, still be favorable to strengthening the structural strength of casing 10 in the kink 11 position of easy fracture, strengthened the bulk strength of power battery package. It is worth mentioning that the cover plate 7 can be arranged to be of an uneven structure so as to enhance the structural strength of the cover plate and also generate a certain deformation amount when the thermal runaway occurs, so that the net volume in the shell of the power battery pack when the thermal runaway occurs is increased, the pressure in the shell is reduced, and the risk of cracking of the shell when the thermal runaway occurs is reduced; of course, in order to improve the strength of the reinforcing frame 3 itself, the reinforcing frame 3 may be provided in an uneven structure.

As shown in fig. 4 to 8, the upper and lower sides of the transverse rib 4 are respectively provided with outward flanges 12 turned in opposite directions, so that the strength of the reinforcing frame 3 is improved, and the assembling strength between the reinforcing frame 3 and the cover plate 7 is optimized, thereby ensuring the overall strength of the upper shell 10.

In order to optimize the overall structure of the upper housing 10, the longitudinal rib 8 includes a plurality of bent portions 11 at intervals, and the reinforcing frame 3 includes a plurality of transverse ribs 4 disposed in one-to-one correspondence with the plurality of bent portions 11.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. 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 shell of power battery package, characterized in that, the shell includes explosion-proof valve (2) and the casing that has the cavity, the casing is including keeping spaced inlayer lateral wall and outer lateral wall, outer lateral wall has the outer hole in order to assemble explosion-proof valve (2), inlayer lateral wall have with hole (5) that the outer hole dislocation set up, so that the cavity can pass through hole (5), clearance between outer lateral wall and the inboard lateral wall with explosion-proof valve (2) intercommunication.

2. The power battery pack housing according to claim 1, wherein the housing comprises a fire filtering structure (6) mounted at the inner bore (5) for filtering flames emitted in the chamber.

3. The power battery pack casing according to claim 2, wherein the fire filtering structure (6) is a metal screen.

4. The power battery pack shell according to any one of claims 1-3, wherein the shell comprises a bottom plate (9), an upper shell (10) and a boundary beam (1), the boundary beam (1) is in a frame structure, two opposite sides of the boundary beam are provided with openings, the bottom plate (9) and the upper shell (10) are respectively installed at the two sides of the boundary beam (1) at the openings to jointly form the cavity, the inner side wall and the outer side wall are two side walls of the boundary beam (1), and the inner hole (5) and the outer hole are arranged in a staggered manner in the thickness direction of the boundary beam (1).

5. The power battery pack case according to claim 4, wherein the inner side wall includes a plurality of inner holes (5) respectively provided at both sides of the outer hole in a circumferential direction of the edge beam (1).

6. The power battery pack case according to claim 4, wherein the upper case (10) includes a reinforcing frame (3) and a plurality of cover plates (7), the plurality of cover plates (7) are mounted together by the reinforcing frame (3), and the strength of the reinforcing frame (3) is greater than that of the cover plates (7).

7. The outer casing of the power battery pack according to claim 6, wherein the reinforcing frame (3) comprises a transverse rib (4) and a pair of longitudinal ribs (8), the pair of longitudinal ribs (8) are spaced and oppositely arranged, the upper side wall of the longitudinal rib (8) comprises a bent part (11) bent in the height direction of the upper casing (10), and two ends of the transverse rib (4) are respectively connected with the bent parts (11) of the pair of longitudinal ribs (8).

8. The power battery pack casing according to claim 7, wherein the upper and lower sides of the transverse rib (4) are respectively provided with outward flanges (12) turned in opposite directions.

9. The power battery pack case according to claim 8, wherein the longitudinal rib (8) includes a plurality of bent portions (11) at intervals, and the reinforcing frame (3) includes a plurality of transverse ribs (4) provided in one-to-one correspondence with the plurality of bent portions (11).

10. A power battery pack, characterized in that the power battery pack comprises a housing of the power battery pack according to any one of claims 1-9.