阅读说明：本技术 一种电池包箱盖的局部补强方法及补强型电池包箱盖 (Local reinforcement method of battery pack case cover and reinforced battery pack case cover ) 是由 刘刚 于 2019-10-31 设计创作，主要内容包括：本发明涉及一种电池包箱盖的局部补强方法及补强型电池包箱盖,补强型电池包箱盖包括箱盖和补强结构,箱盖内表面向外突起形成一十字型凹槽,十字型凹槽包括垂直交叉布置的横向槽和纵向槽,纵向槽沿箱盖的长度方向布置,横向槽沿箱盖的宽度方向布置,横向槽的深度小于纵向槽的深度；横向槽的两端分别固定有补强结构,补强结构分别覆盖横向槽的槽底、槽壁以及所述箱盖内表面。本发明通过在电池包箱盖的横向槽两端设置补强结构,能够增强电池包箱盖整体以及局部强度,减少电池包箱盖在局部出现断裂的风险,并且使电池包箱盖应力分配均匀；本发明不需要整体增加电池包箱盖的厚度,即不需要额外增加箱盖重量,使增设补强结构后,整体强度能够达标。(The invention relates to a local reinforcement method of a battery pack case cover and a reinforced battery pack case cover, wherein the reinforced battery pack case cover comprises a case cover and a reinforcement structure, the inner surface of the case cover protrudes outwards to form a cross-shaped groove, the cross-shaped groove comprises a transverse groove and a longitudinal groove which are vertically and crossly arranged, the longitudinal groove is arranged along the length direction of the case cover, the transverse groove is arranged along the width direction of the case cover, and the depth of the transverse groove is smaller than that of the longitudinal groove; and reinforcing structures are respectively fixed at two ends of the transverse groove and respectively cover the groove bottom and the groove wall of the transverse groove and the inner surface of the box cover. According to the invention, the reinforcing structures are arranged at the two ends of the transverse groove of the battery pack case cover, so that the overall and local strength of the battery pack case cover can be enhanced, the risk of local fracture of the battery pack case cover is reduced, and the stress distribution of the battery pack case cover is uniform; the battery pack box cover does not need to be integrally increased in thickness, namely, the weight of the box cover does not need to be additionally increased, and the integral strength can reach the standard after the reinforcing structure is additionally arranged.)

1. A reinforced battery pack case cover is characterized by comprising a case cover and a reinforcing structure, wherein a cross-shaped groove is formed by outwards protruding the inner surface of the case cover, the cross-shaped groove comprises a transverse groove and a longitudinal groove which are vertically and crossly arranged, the longitudinal groove is arranged along the length direction of the case cover, the transverse groove is arranged along the width direction of the case cover, and the depth of the transverse groove is smaller than that of the longitudinal groove; the reinforcing structures are respectively fixed at two ends of the transverse groove and respectively cover the groove bottom and the groove wall of the transverse groove and the inner surface of the box cover.

2. A reinforced battery pack case cover according to claim 1, wherein the reinforcing structure comprises a first reinforcing part, a second reinforcing part and a third reinforcing part that are integrally connected and form a bent structure, the first reinforcing part is fixed on the bottom of the transverse groove at one end, the second reinforcing part is fixed on the wall of the transverse groove at one end, and the third reinforcing part is fixed on the inner surface of the case cover at one end of the transverse groove.

3. A reinforced battery pack case cover as claimed in claim 2, wherein the first, second and third reinforcing portions are U-shaped, the first reinforcing portion is fixed to the end of the transverse groove and the bottom of the groove near both sides of the end, the second reinforcing portion is fixed to the end of the transverse groove and the wall of the groove near both sides of the end, and the third reinforcing portion is fixed to the end of the transverse groove and the inner surface of the case cover near both sides of the end.

4. A reinforced battery pack case cover as claimed in claim 2 or 3, wherein the inner surface of the case cover at the end of the transverse groove protrudes outward to form a reinforcing groove, the reinforcing groove is communicated with the end of the transverse groove and has a depth smaller than the depth of the transverse groove, and the middle of the third reinforcing part is fixed at the bottom of the reinforcing groove and extends along the wall of the reinforcing groove to the inner surface of the case cover.

5. A reinforced battery case cover as defined in claim 3, wherein a reinforcing rib is provided at the junction between the bottom and the wall of the transverse groove, the first reinforcing part comprises a middle reinforcing section, a first side reinforcing section and a second side reinforcing section which are connected to each other to form a U-shaped structure, the middle reinforcing section covers the reinforcing rib at the end of the transverse groove, and the first side reinforcing section and the second side reinforcing section respectively cover the reinforcing rib near the end of the transverse groove and extend to the bottom of the transverse groove.

6. A reinforced battery pack case cover as recited in claim 1, wherein the reinforcing structure and the case cover are made of aluminum profile material; the reinforcing structure is welded on the box cover; the thickness of the reinforcing structure is the same as that of the box cover.

7. A local reinforcement method of a battery pack case cover is characterized by comprising the following steps:

s1, carrying out finite element analysis on the box cover structure with the cross-shaped groove;

s2, determining a stress concentration part of the box cover, wherein the structural strength of the stress concentration part does not meet the yield limit of box cover materials;

s3, designing a reinforcing structure with the same structure as the stress concentration part;

and S4, fixing the reinforcing structure on the inner surface of the stress concentration part in the case cover to form a reinforcing battery pack case cover.

8. The local reinforcing method for the cover of the battery pack box according to claim 7, wherein in S2, the material of the cover is an aluminum profile, and the yield limit is 100 MPa; the stress concentration parts are two ends of a transverse groove of the cross-shaped groove, the transverse groove is arranged along the width direction of the box cover, and the reinforcing structure covers the groove bottom and the groove wall of the transverse groove and the inner surface of the box cover respectively.

9. The method for locally reinforcing the cover of a battery pack according to claim 7, wherein in step S1, a finite element 8-fold static load calculation is performed on a structural model of the cover with cross-shaped grooves by using the abqs software.

10. The method of claim 7, wherein the cross-shaped recess comprises a transverse groove along the width of the cover; the reinforcing structure comprises a first reinforcing part, a second reinforcing part and a third reinforcing part which are integrally connected and form a bending structure, the first reinforcing part is fixed on the groove bottom at one end of the transverse groove, the second reinforcing part is fixed on the groove wall at one end of the transverse groove, and the third reinforcing part is fixed on the inner surface of the box cover at one end of the transverse groove; first reinforcement portion, second reinforcement portion and third reinforcement portion all are U type structure, first reinforcement portion is fixed on the transverse groove tip and the tank bottom that is close to the tip both sides, second reinforcement portion is fixed on the transverse groove tip and the cell wall that is close to the tip both sides, third reinforcement portion is fixed on the transverse groove tip and the case lid internal surface that is close to the tip both sides.

Technical Field

The invention relates to the technical field of new energy automobiles, in particular to a local reinforcing method of a battery pack case cover and a reinforced battery pack case cover.

Background

At present, the panel of general battery package case lid all is a large-scale stamping forming's whole, and local intensity phenomenon not enough can appear in this way being inevitable, and when using, the direct defect of battery package case lid can appear the fracture in a certain position, generally remedy through the thickness that increases the case lid to this kind of structural strength substandard battery package case lid, but can increase the whole weight of case lid.

Disclosure of Invention

The invention aims to solve the technical problems that the existing battery pack box cover is insufficient in local strength and easy to break and the like.

The technical scheme for solving the technical problems is as follows: a reinforced battery pack box cover comprises a box cover and a reinforcing structure, wherein a cross-shaped groove is formed by outwards protruding the inner surface of the box cover, the cross-shaped groove comprises a transverse groove and a longitudinal groove which are vertically and crossly arranged, the longitudinal groove is arranged along the length direction of the box cover, the transverse groove is arranged along the width direction of the box cover, and the depth of the transverse groove is smaller than that of the longitudinal groove; the reinforcing structures are respectively fixed at two ends of the transverse groove and respectively cover the groove bottom and the groove wall of the transverse groove and the inner surface of the box cover.

The invention has the beneficial effects that: according to the invention, the reinforcing structures are arranged at the two ends of the transverse groove of the battery pack case cover, so that the overall and local strength of the battery pack case cover can be enhanced, the risk of local fracture of the battery pack case cover is reduced, and the stress distribution of the battery pack case cover is uniform; according to the invention, the reinforcing structures are arranged at the two ends of the transverse groove with concentrated stress, so that the thickness of the battery pack box cover does not need to be integrally increased, namely, the weight of the box cover does not need to be additionally increased, and after the reinforcing structures are additionally arranged on the battery pack box cover with the integral strength not reaching the standard, the integral strength can meet the strength requirement on the battery pack box cover.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, the reinforcing structure comprises a first reinforcing part, a second reinforcing part and a third reinforcing part which are integrally connected and form a bending structure, the first reinforcing part is fixed on the groove bottom at one end of the transverse groove, the second reinforcing part is fixed on the groove wall at one end of the transverse groove, and the third reinforcing part is fixed on the inner surface of the box cover at one end of the transverse groove.

The beneficial effect of adopting the further scheme is that: the first reinforcing part, the second reinforcing part and the third reinforcing part which form a bending structure are adopted, so that the groove bottom, the groove wall and the inner surface of the box cover at one end of the transverse groove can be fixed, and the stress distribution at two ends of the reinforced transverse groove is more uniform.

Further, first reinforcement portion, second reinforcement portion and third reinforcement portion all are U type structure, first reinforcement portion is fixed on transverse groove tip and the tank bottom that is close to the tip both sides, second reinforcement portion is fixed on transverse groove tip and the cell wall that is close to the tip both sides, third reinforcement portion is fixed on transverse groove tip and the case lid internal surface that is close to the tip both sides.

The beneficial effect of adopting the further scheme is that: adopt the reinforcement portion of U type structure, can not only carry out the structure reinforcement near transverse groove both ends tip, still carry out the structure reinforcement to the position of transverse groove tip both sides, avoid appearing behind the transverse groove tip reinforcement, the problem of the department of bending stress concentration near the reinforcement position.

Further, the case lid internal surface of transverse groove both ends tip position outwards swells and forms a reinforcement groove, the reinforcement groove with transverse groove tip intercommunication and the degree of depth are less than the degree of depth of transverse groove, third reinforcement portion middle part is fixed the tank bottom in reinforcement groove and follow the cell wall in reinforcement groove extends to on the case lid internal surface.

The beneficial effect of adopting the further scheme is that: the third reinforcement part is matched with the reinforcement groove structure, so that the problem of stress concentration at the transition part between the reinforcement groove and the transverse groove is prevented.

Furthermore, a reinforcing convex rib is arranged at the joint of the groove bottom and the groove wall of the transverse groove, the first reinforcing part comprises a middle reinforcing section, a side reinforcing section I and a side reinforcing section II which are mutually connected to form a U-shaped structure, the middle reinforcing section covers the reinforcing convex rib at the end part of the transverse groove, and the side reinforcing section I and the side reinforcing section II respectively cover the reinforcing convex rib close to the end part of the transverse groove and extend to the groove bottom of the transverse groove; and the parts of the first side reinforcing section and the second side reinforcing section, which extend to the bottoms of the transverse groove bottoms, are connected with the middle reinforcing section.

The beneficial effect of adopting the further scheme is that: strengthen protruding muscle to provide effectual enhancement support for the structure of transverse groove, adopt middle part reinforcement section and lateral part reinforcement section complex mode moreover, need not extend to the transverse groove tank bottom with first reinforcement middle part on, utilize the lateral part reinforcement section to extend to the tank bottom of transverse groove, just can utilize whole bearing structure to realize the reinforcement of transverse groove structure.

Further, the reinforcing structure and the box cover are both made of aluminum profile materials; the reinforcing structure is welded on the box cover; the thickness of the reinforcing structure is the same as that of the box cover.

The beneficial effect of adopting the further scheme is that: the reinforcing structure is welded on the inner surface of the box cover, so that the reinforcing structure and the box cover form an integral structure, and the structural strength is higher; the reinforcing structure and the box cover are made of aluminum profile materials and have the same thickness, and the reinforcing structure does not need to be additionally molded or made of other materials, so that the box cover is very convenient to use.

A local reinforcing method for a battery pack case cover comprises the following steps:

s1, carrying out finite element analysis on the box cover structure with the cross-shaped groove;

s2, determining a stress concentration part of the box cover, wherein the structural strength of the stress concentration part does not meet the yield limit of box cover materials;

s3, designing a reinforcing structure with the same structure as the stress concentration part;

and S4, fixing the reinforcing structure on the inner surface of the stress concentration part in the case cover to form a reinforcing battery pack case cover.

The invention has the beneficial effects that: according to the reinforcing method, finite element analysis is carried out on the battery pack case cover structure, after the stress concentration part is determined, the reinforcing structure is additionally arranged at the stress concentration part, the overall and local strength of the battery pack case cover is enhanced, the risk of fracture of the battery pack case cover in local is reduced, and the stress distribution of the case cover is more uniform.

Further, in S2, the box cover material is an aluminum profile, and the yield limit is 100 MPa; the stress concentration parts are two ends of a transverse groove of the cross-shaped groove, the transverse groove is arranged along the width direction of the box cover, and the reinforcing structure covers the groove bottom and the groove wall of the transverse groove and the inner surface of the box cover respectively.

Further, in S1, a finite element 8-fold static load calculation was performed on the model of the tank lid structure with the cross-shaped recess using the ABQUS software.

Further, the cross-shaped groove comprises a transverse groove arranged along the width direction of the box cover; the reinforcing structure comprises a first reinforcing part, a second reinforcing part and a third reinforcing part which are integrally connected and form a bending structure, the first reinforcing part is fixed on the groove bottom at one end of the transverse groove, the second reinforcing part is fixed on the groove wall at one end of the transverse groove, and the third reinforcing part is fixed on the inner surface of the box cover at one end of the transverse groove; first reinforcement portion, second reinforcement portion and third reinforcement portion all are U type structure, first reinforcement portion is fixed on the transverse groove tip and the tank bottom that is close to the tip both sides, second reinforcement portion is fixed on the transverse groove tip and the cell wall that is close to the tip both sides, third reinforcement portion is fixed on the transverse groove tip and the case lid internal surface that is close to the tip both sides.

Drawings

FIG. 1 is a first perspective view of the case cover according to the present invention;

FIG. 2 is a schematic perspective view of a second embodiment of the present invention;

FIG. 3 is a first perspective view of the reinforcement structure of the present invention;

FIG. 4 is a schematic perspective view of a reinforcement structure according to the present invention;

fig. 5 is a three-dimensional schematic view of the reinforcement structure of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a transverse slot; 11. reinforcing the convex ribs; 2. a longitudinal slot; 3. a reinforcement groove; 4. a reinforcing structure; 41. a first reinforcing portion; 42. a second reinforcing portion; 43. a third reinforcing portion; 5. a box cover; 51. the inner surface of the case cover.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.