CN217158482U

CN217158482U - Battery package end protects structure, battery package and vehicle

Info

Publication number: CN217158482U
Application number: CN202220234886.6U
Authority: CN
Inventors: 王亚坤
Original assignee: Beijing Chehejia Automobile Technology Co Ltd
Current assignee: Beijing Chehejia Automobile Technology Co Ltd
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-08-09
Anticipated expiration: 2032-01-27

Abstract

The utility model relates to a power battery makes technical field, especially relates to a battery package protects structure, battery package and vehicle at bottom. This structure is protected at bottom of battery package is through setting up the enhancement layer into the structure that has a plurality of cushion chambers, in order to play and cushion the absorbing effect at the end between sheath and battery package, on this basis, the open end of cushion chamber is all arranged in the direction of sheath and the direction of sheath at the back of the body at the end of the orientation, thereby on the basis of having satisfied buffering shock attenuation effect, make one side that enhancement layer and battery package are connected and the one side of being connected with end sheath all have comparatively firm butt effect, thereby make the atress of both sides balanced, under the condition in the face of the great striking in outside, can effectively protect battery package structure through the better supporting effect that the balanced atress in both sides played, the stability of battery package has been improved greatly.

Description

Battery package end protects structure, battery package and vehicle

Technical Field

The utility model relates to a power battery makes technical field, especially relates to a battery package protects structure, battery package and vehicle at bottom.

Background

In the new forms of energy technical field, the energy density direct relation of battery is to the development of new forms of energy, consequently, in order to promote the energy density of battery, and realizes the whole protection to battery package structure, can use the liquid cooling board to cool off battery package in the bottom of battery package usually, sets up end backplate protection whole battery package structure simultaneously to avoid the liquid cooling board to be hit by the ball in the use and produce the damage and need change whole battery package structure.

At present to the backplate structure at the bottom of the battery package, adopt steel sheet and strengthening rib welding mode as an organic whole to form at the bottom of strengthening backplate usually, however this kind of backplate structure at the bottom makes the battery package because the atress is uneven and the damage condition that local atress too big leads to appears in the bottom receives the back of colliding with easily because the contact and the butt effect of plate body both sides, that is to say, still is difficult to guarantee the protection demand to the battery package when receiving external great striking.

SUMMERY OF THE UTILITY MODEL

In order to solve or at least partially solve the technical problem, the present disclosure provides a battery pack bottom protection structure, a battery pack and a vehicle.

In a first aspect, the present disclosure provides a battery pack bottom protection structure, which includes a bottom protection layer and a reinforcement layer, where the bottom protection layer is at least used for protecting the bottom of a battery pack, and the reinforcement layer is disposed on a side surface of the bottom protection layer facing the battery pack;

the reinforced layer is provided with a plurality of buffer cavities with open ends, the buffer cavities are distributed along the surface of the bottom protective layer, at least one open end of each buffer cavity faces the bottom protective layer, and at least one other open end of each buffer cavity faces away from the bottom protective layer.

Optionally, the open ends of two adjacent buffer cavities in the plurality of buffer cavities face in opposite directions.

Optionally, the reinforcing layer includes a plurality of concave portions, and the surface depressions of all the concave portions form the buffer cavities.

Optionally, the concave portions extend along the length direction of the bottom protective layer;

and all the concave strip parts are uniformly distributed in the width direction vertical to the length direction of the bottom protective layer, and the side edges of the two adjacent concave strip parts are connected.

Optionally, in the plurality of concave strip portions, a plurality of riveting points are arranged on the surface where at least one concave strip portion exists, a plurality of fixing points corresponding to all the riveting points are arranged on the surface of the bottom protective layer, and the fixing points are in riveting connection with the riveting points to achieve the mutual connection between the concave strip portion and the bottom protective layer.

Optionally, the bottom protective layer includes a bottom plate main body and an extension flange, the extension flange surrounds the edge of the bottom plate main body and surrounds the top surface of the bottom plate main body to form a mounting groove, and the reinforcing layer is laid in the mounting groove.

Optionally, the battery pack bottom protection structure further comprises a heat insulation layer, and the heat insulation layer is laid on the top surface of the reinforcing layer.

In a second aspect, the present disclosure further provides a battery pack, which includes the battery pack bottom protection structure.

Optionally, the bottom surface of the battery pack is provided with a side frame and a middle longitudinal beam, and the top surface of the battery pack bottom protection structure is in contact with the side frame and the middle longitudinal beam.

In a third aspect, the present disclosure also provides a vehicle including the battery pack described above.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the utility model provides a protect structure at bottom of battery package, battery package and vehicle, set up the enhancement layer into the structure that has a plurality of cushion chambers through the adoption, in order to play and cushion the absorbing effect at the end between sheath and battery package, on this basis, the open end of cushion chamber all arranges in the direction of sheath and the direction of sheath at the back of the body at the end of orientation, thereby on the basis of having satisfied buffering shock attenuation effect, make one side that enhancement layer and battery package are connected and the enhancement layer all have comparatively firm butt effect with one side of being connected of sheath at the end, thereby make the atress of both sides balanced, under the condition in the face of the great striking in outside, can effectively protect battery package structure through the better supporting effect that the balanced atress in both sides played, the stability of battery package has been improved greatly.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic structural view of a bottom protection structure of a battery pack according to an embodiment of the present disclosure;

fig. 2 is a schematic cross-sectional view of a bottom protection structure of a battery pack according to an embodiment of the present disclosure;

fig. 3 is a schematic mounting diagram of a bottom protection structure of a battery pack according to an embodiment of the disclosure;

fig. 4 is a schematic view of the internal structure of the bottom protection structure of the battery pack according to the embodiment of the present disclosure;

FIG. 5 is a partial structural view of portion A of FIG. 4;

FIG. 6 is a schematic structural diagram of a bottom passivation layer according to an embodiment of the disclosure;

FIG. 7 is a schematic structural view of a reinforcement layer according to an embodiment of the present disclosure;

FIG. 8 is a schematic cross-sectional view of a reinforcement layer in an embodiment of the present disclosure;

FIG. 9 is a schematic structural view of a rivet according to an embodiment of the present disclosure.

Reference numerals:

1. a bottom protective layer; 1a, a fixed point; 11. a base plate main body; 12. extending and flanging; 2. a reinforcing layer; 20. a buffer chamber; 21. a concave strip portion; 21a, riveting points; 3. a side frame; 4. a middle longitudinal beam; 5. riveting; 6. a through hole; 7. a heat-insulating layer; a. a length direction; b. the width direction.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

At present, the battery pack liquid cooling plate and the battery pack overall structure are protected in two ways, and one way is to adopt the steel plate and the steel plate to bend the reinforcing rib and then weld as an integrated body to strengthen the bottom guard plate so as to ensure that the structural strength can reach the bottom protection effect. On the basis, the steel plate does not meet the corrosion prevention requirement, so an exposed steel plate surface is required to be subjected to electrophoresis to form a corrosion prevention layer. However, the bottom protection plate is weak in structural strength, and cannot ensure the contact and abutting effect of the two sides of the reinforcing plate at the same time, and when the bottom protection plate is subjected to a large impact, the risk that the internal structure of the battery pack is damaged still exists.

To above-mentioned defect, this embodiment provides a structure is protected at bottom of battery package, and it guarantees structural strength through setting up the enhancement layer to having a plurality of cushion chambers, avoids the battery package to receive the striking and leads to damaging, has realized the effect that both compromise. The specific structure of the battery bottom protection structure is as follows:

as shown in fig. 1 to 9, the present embodiment provides a battery pack bottom protection structure, which is configured to be disposed at the bottom of a battery pack, and comprises a bottom protection layer 1 and a reinforcement layer 2, wherein the bottom protection layer 1 is configured to protect at least the bottom of the battery pack, and the reinforcement layer 2 is disposed on a side surface of the bottom protection layer 1 facing the battery pack; the reinforcing layer 2 is formed with a plurality of buffer cavities 20 having open ends distributed along the top surface of the base sheath 1, and of the plurality of buffer cavities 20, at least one open end of the buffer cavity 20 is located toward the base sheath 1, and at least another open end of the buffer cavity 20 is located away from the base sheath 1.

Generally, the bottom protection structure of the battery pack is arranged on the bottom surface of the battery pack in a normal placement state, wherein the bottom protection layer 1 can meet basic requirements by using a 1.2mm punched plate, and of course, in other embodiments, plates with other specifications can be adopted. The buffer cavity 20 formed on the reinforcing layer 2 may cover only the area of the bottom of the battery pack which needs to be protected in an important manner, or may be formed on the whole paving surface in order to ensure a more comprehensive protection effect. The buffer chamber may alternatively be open-topped with the top opening forming an open end of the buffer chamber.

As the side frames 3 and the middle longitudinal beams 4 are arranged on the bottom surface of the battery pack, the side frames 3 form an annular framework of the battery pack, and the middle longitudinal beams 4 are transversely arranged and connected at the side frames 3 at the end parts, so that the structural strength of the bottom surface of the whole battery pack is improved. Therefore, when the bottom protection structure of the battery pack is installed, the top surface of the bottom protection structure of the battery pack is in contact with the side frames 3 and the middle longitudinal beam 4, which can be seen in fig. 3. That is, the bottom protection structure of the battery pack is firmly attached to the bottom surface of the battery pack so as to cover the bottom surface of the battery pack, and for example, the bottom protection layer 1 is formed to have the same shape and size as those of the side frame 3 of the battery pack, and the side portion of the bottom protection layer 1 is connected to the side frame 3 of the battery pack so as to be fixed relative to the side frame 3 of the battery pack. When the battery pack is hit by a ball at the bottom, the extrusion force is transmitted to the side frames 3 and the middle longitudinal beam 4, so that the direct extrusion to the liquid cooling plate at the bottom of the battery pack and the battery core of the battery pack is avoided.

This battery wraps end and protects structure sets up the enhancement layer 2 into the structure that has a plurality of cushion chambers through the adoption, in order to play and cushion the absorbing effect at the end between sheath 1 and battery package, on this basis, the open end of cushion chamber 20 is all arranged in the direction of sheath 1 at the end of orientation and the direction of sheath 1 (also towards battery package bottom) at the back of the body, thereby on the basis of having satisfied buffering shock attenuation effect, one side that make enhancement layer 2 and battery package be connected and one side that enhancement layer 2 and end sheath 1 are connected all have comparatively firm butt effect, thereby make the atress of both sides balanced, under the condition in the face of the great striking in outside, can effectively protect battery package structure through the better supporting effect that the balanced atress of both sides played, the stability of battery package has been improved greatly.

Further, the bottom protective layer 1 is an aluminum plate, and the reinforcing layer 2 is a steel plate. Through adopting steel aluminium composite construction, guaranteed the anticorrosive effect in the outside through end sheath 1 structure promptly, form inside additional strengthening through enhancement layer 2 again, guarantee this battery package end and protect the overall structure intensity of structure, make it have the advantage of anticorrosive, sealed and lightweight of aluminum plate and the advantage of steel deck structural strength and cost simultaneously.

The bottom protective layer 1 may specifically include a bottom plate main body 11 and an extension flange 12, the extension flange 12 surrounds the bottom plate main body 11 and surrounds the top surface of the bottom plate main body 11 to form a mounting groove, and the reinforcing layer 2 is disposed in the mounting groove.

The bottom protective layer 1 forms an external surrounding structure, so that the reinforcing layer 2 is wrapped in the space at the bottom of the battery pack, the reinforcing layer 2 is not exposed, and the anti-corrosion effect can be ensured without performing electrophoresis on the reinforcing layer 2. Meanwhile, the reinforcing layer 2 can be limited and fixed conveniently due to the design of the mounting groove.

In this embodiment, the two ends of the reinforcing layer 2 extend to the inner side of the extending flange 12 to facilitate the fixing and limiting between the two, so that the whole structure is more fixed and firm. The plurality of buffer cavities 20 formed in the reinforcing layer 2 are arranged such that the open ends of two adjacent buffer cavities 20 face opposite to each other. Since there is at least one open end facing the bottom sheath 1, the open ends referred to herein are oppositely oriented, i.e., the open ends between two adjacent buffer cavities 20 are respectively facing the bottom sheath 1 and the back facing the bottom sheath 1.

Further, the reinforcing layer 2 includes a plurality of concave portions 21, and the surface depressions of all the concave portions 21 form the cushion chambers 20. The structure capable of covering the whole surface of the under-coating layer 1 is formed by the design of the concave strip part 21, and the concave formed on the surface of the concave strip part 21 is used as the buffer cavity 20, so that the structural design is simple, and the arrangement is convenient. When the bottom protection structure of the battery pack is installed at the bottom of the battery pack, one end of the top or the bottom of the concave part 21 is fixed on the surface of the bottom protection layer 1, the other end of the top or the bottom of the concave part 21 is supported on the bottom surface of the battery pack, so that the surface is sunken to form the hollow buffer cavity 20, when the bottom of a vehicle is collided, the concave part 21 can be properly deformed to absorb impact energy, the impact on the bottom of the battery pack is reduced, and the influence on a battery core and a liquid cooling plate in the battery pack is avoided.

In the present embodiment, the concave portions 21 extend in the longitudinal direction a of the undercoat layer 1. In addition, all the concave portions 21 are uniformly arranged in the width direction b perpendicular to the longitudinal direction a of the undercoat layer 1, and the side edges of two adjacent concave portions 21 are in contact with each other. That is, all the concave portions 21 are connected in sequence at the side edges to form a transverse extending structure similar to a wave shape, so that the reinforcing layer 2 is conveniently integrated with the bottom protective layer 1, and the flatness of the abutting surface can be ensured as much as possible. Correspondingly, the length direction a of the bottom protective layer 1, i.e. the extending direction of the surface of the bottom protective layer abutting against the battery pack, may be the connecting direction between any pair of side edges, and the width direction is the other direction perpendicular to the connecting direction.

The opening directions of the two adjacent concave strip portions 21 are opposite, specifically, along the arrangement direction of the concave strip portions 21, the openings of the concave strip portions 21 sequentially face the bottom of the battery pack, then face the surface of the bottom protection layer 1, or face the surface of the bottom protection layer 1 and then face the bottom of the battery pack, so that the surfaces of the two sides of the reinforcing layer 2 are uniformly distributed, and the abutting firmness is guaranteed.

On this basis, if want to finally realize above-mentioned structural design, in this embodiment, can adopt a whole piece steel sheet to carry out the multistage and reverse bend in proper order and form the concave strip group of compriseing concave strip portion 21, thereby form the equipartition and the opening orientation crisscross cushion chamber in proper order on the surface of enhancement layer 2 through reverse bending, can obtain whole concave strip group fast promptly through a steel sheet, conveniently realize the quick installation between enhancement layer 2 and the end sheath 1 for the preparation efficiency, save time. Of course, in other embodiments, a plurality of concave strip portions 21 may be connected in sequence at their sides to form a whole concave strip group, and the concave strip group is disposed on the top surface of the bottom protective layer 1, or the whole concave strip group is directly formed by uniformly distributed steel strips extending in both the longitudinal and transverse directions. Specifically, the steel plate can be obtained by bending a sheet metal by using a steel plate with a thickness of 1mm or other steel plates with a thickness capable of meeting the strength requirement. As for the specific shape of the concave strip portion 21, in the present embodiment, it is formed into a groove-shaped structure with two sides extending vertically, and in other applicable manners, it can be provided with other supporting structures capable of ensuring stability.

For the connection mode between the components of the battery pack bottom protection structure, the reinforcing layer 2 and the bottom protection layer 1 are connected by rivet locking.

The principle of the clinch technique, which may be referred to in particular as the SPR technique, is the use of rivets which penetrate the first (and intermediate) layer material under the action of an external force and flow and spread over the lowermost layer material to form a mechanical connection which plastically deforms forward of one another.

The lock rivet connection technology can be used for connecting materials with different thicknesses and materials, the dynamic fatigue strength is high, the collision energy absorption performance is good, holes do not need to be formed in advance in the surface of the interlayer in the connection mode, protruding parts do not exist, the production and manufacturing process is facilitated, the final structure can be more attractive and complete, and the lock rivet connection technology is very suitable for being applied to light and thin plates similar to the battery bottom protection structure.

Specifically, in the plurality of concave portions 21, a plurality of rivet points 21a are provided on the surface where at least one concave portion 21 exists, a plurality of fixing points 1a corresponding to all the rivet points 21a are provided on the surface of the base coat layer 1, and the concave portions 21 and the base coat layer 1 are connected by caulking at the fixing points 1a and the rivet points 21 a. Namely, the connection points of the lock rivet connection are firstly positioned, and then the further connection and fixation are carried out. First, the rivet 5 is placed at the rivet joint 21a and the fixing point 1a, and pressure is applied to the rivet 5 so that the end of the rivet 5 pierces the surface of the material and gradually extends into the interior of the material while the material is deformed to accommodate insertion of the rivet 5 until the upper surface of the rivet 5 is pressed flush with the surface of the material. In the present embodiment, the caulking points 21a may be arranged on 3 to 6 concave portions 21, but may be arranged on a different number of concave portions 21 in other embodiments.

Rivet 5 can adopt countersunk head rivet, and its head can keep the parallel and level with the surface of upper plate, makes the outward appearance clean and tidy pleasing to the eye as far as possible, also can reduce Z after the parallel and level simultaneously to, this battery package protects the shared space of vertical direction of structure promptly at the bottom, is favorable to the integration of structure. Of course, in other embodiments, other types of rivets may be used, such as flat head rivets or T-rivets, for example.

The rivet points 21a are uniformly arranged on the surface of the reinforcing layer 2, and preferably can be arranged on the bottom surface of the concave portion 21, and specifically on the concave portion 21 with the top opening facing the bottom of the battery pack, so as to facilitate connection and fixation with the bottom protective layer 1. Preferably, a set of riveting points 21a may be provided on 2 to 3 concave portions 21, and the set of riveting points 21a may be arranged along the length direction of the concave portions 21, specifically, 1 to 3.

In addition, still be provided with a plurality of through-holes 6 on the surface of enhancement layer 2, through-hole 6 can be located the electric core bottom of battery package. The through hole 6 is arranged to leave a space deformed when being impacted at the bottom of the battery pack core, so as to play a role in absorbing impact when resisting bottom impact. The through holes 6 are arranged on the reinforcing layer 2 at intervals, and the specific arrangement number and the opening specification can be designed or flexibly adjusted according to actual needs. Specifically, the through-hole 6 may be provided at a middle position in the width direction of the reinforcing layer 2, avoiding an influence on the structural strength of the reinforcing layer 2.

In order to play the bottom liquid cooling board of battery package and carry out the guard action while, can also maintain the liquid cooling effect of liquid cooling board, in this embodiment, the adoption still includes heat preservation 7 at the bottom of the battery package on protecting the structure to make heat preservation 7 lay in the top surface of enhancement layer 2. The setting up of heat preservation 7 can play heat retaining effect on the one hand, and on the other hand can also avoid battery package end to protect structure and liquid cooling board rigid contact, improves the NVH effect. NVH is an abbreviation of Noise, Vibration, Harshness, specifically referring to Noise, Vibration and Harshness, which are the three most directly and superficially capable of representing the manufacturing quality and performance of the battery pack structure.

On the basis, the heat-insulating layer 7 can be bonded with the reinforcing layer 2 (specifically, a steel plate) to ensure firm connection. Or other connection modes, even no connection is carried out, so that the battery pack can be clamped between the liquid cooling plate of the battery pack and the battery pack bottom protection structure. The heat preservation layer 7 can adopt a foam material, is light in weight and good in heat preservation performance, specifically, foam with the thickness of 1mm is used in the embodiment, of course, heat preservation materials with other materials and thicknesses can be adopted in other embodiments, and the heat preservation requirement on the battery can be met.

In addition, this application still provides a battery package, protects structure including foretell battery package end.

In some embodiments, the bottom surface of the battery pack is provided with side frames 3 and middle longitudinal beams 4, and the top surface of the bottom protection structure of the battery pack is in contact with the side frames 3 and the middle longitudinal beams 4.

In addition, this application still provides a vehicle, includes above-mentioned battery package.

The battery package that this application provided and vehicle all have above-mentioned battery package and protect the structure at the bottom, consequently can bring with the battery package protect the structure at the bottom the same or similar technological effect, no longer give unnecessary details here, can specifically refer to the description of embodiment one.

The vehicle provided by the embodiment may be a passenger vehicle, a commercial vehicle, or the like, and the embodiment is not limited thereto. Any vehicle having the battery pack bottom protection structure and the battery pack battery is within the protection scope of the present embodiment.

Other technical features are the same as those of the first embodiment, and are not described herein again.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The bottom protection structure of the battery pack is characterized by comprising a bottom protection layer and a reinforcing layer, wherein the bottom protection layer is at least used for protecting the bottom of the battery pack, and the reinforcing layer is arranged on the surface of one side, facing the battery pack, of the bottom protection layer;

2. The bottom protection structure for battery packs according to claim 1, wherein the opening ends of adjacent two of the buffer cavities are oppositely oriented.

3. The bottom protection structure for battery packs according to claim 1, wherein the reinforcing layer comprises a plurality of concave portions, and the surface depressions of all the concave portions form the buffer cavities.

4. The bottom protection structure for battery packs according to claim 3, wherein the concave portions extend in the longitudinal direction of the bottom protection layer;

5. The bottom protection structure for battery packs according to claim 3, wherein the surface of at least one of the concave portions is provided with a plurality of riveting points, the surface of the bottom protection layer is provided with a plurality of fixing points corresponding to all the riveting points, and the fixing points and the riveting points are riveted to connect the concave portions and the bottom protection layer.

6. The battery pack bottom protection structure of claim 1, wherein the bottom protection layer comprises a bottom plate main body and an extension flange, the extension flange is arranged around the edge of the bottom plate main body and surrounds the top surface of the bottom plate main body to form a mounting groove, and the reinforcing layer is laid in the mounting groove.

7. The bottom protection structure for battery packs as claimed in claim 1, further comprising an insulating layer laid on the top surface of the reinforcing layer.

8. A battery pack comprising the battery pack bottom cover structure of any one of claims 1 to 7.

9. The battery pack of claim 8, wherein the bottom surface of the battery pack is provided with side frames and a center stringer, and the top surface of the battery pack bottom protective structure is in contact with the side frames and the center stringer.

10. A vehicle characterized by comprising the battery pack according to claim 8 or 9.