CN220821782U

CN220821782U - Battery box and battery pack

Info

Publication number: CN220821782U
Application number: CN202322582975.7U
Authority: CN
Inventors: 宋爱林; 曹新成
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-09-21
Filing date: 2023-09-21
Publication date: 2024-04-19
Anticipated expiration: 2033-09-21

Abstract

The utility model provides a battery box and a battery pack, wherein the battery box comprises: the bottom plate is used for supporting the battery cell; the support beam is arranged on one side of the bottom plate far away from the battery cell; a cavity is arranged in the bottom plate, and an avoidance gap is formed between the support beam and the area where the cavity of the bottom plate is located. The supporting beam provided by the utility model improves the structural strength of the bottom plate to a great extent; on the one hand, the cavity in the bottom plate can absorb external force impact from two sides of the bottom plate, on the other hand, the cavity can be used as a liquid cooling runner, at the moment, the bottom plate can be used as a liquid cooling plate, and an avoidance gap is formed between the support beam and the cavity area of the bottom plate, so that the support beam and the cavity area of the bottom plate can be prevented from being in direct contact, heat preservation can be achieved on a heat exchange medium in the liquid cooling runner, the heat dissipation efficiency of the bottom plate, namely the liquid cooling plate, to the battery cell is guaranteed, meanwhile, a deformation displacement space can be provided for the bottom plate by a buffer gap between the support beam and the bottom plate, and the shock resistance of a bottom support structure of the battery box is improved.

Description

Battery box and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery box and a battery pack.

Background

In the development of battery packs, CIR (Cell in Room) or CTP (Cell to Pack) structures have been the main trend of current battery pack development in order to increase energy density. The battery box of the battery pack with the two structural types is characterized in that the battery compartment is large in duty ratio, and the weight of the battery core in the battery compartment is concentrated, so that the deformation risk is increased after the bottom supporting structure of the battery box is pressed, and the normal use is affected.

Disclosure of utility model

In view of the shortcomings of the prior art, a first object of the present utility model is to provide a battery box with high structural strength, and a bottom support structure of the battery box is less in risk of deformation after being pressed.

Another object of the present utility model is to provide a battery pack having high structural strength and high energy density.

The embodiment of the utility model is realized by the following technical scheme:

A battery box, comprising: the bottom plate is used for supporting the battery cell; the support beam is arranged on one side of the bottom plate far away from the battery cell; the bottom plate is internally provided with a cavity, and an avoidance gap is formed between the support beam and the area of the bottom plate where the cavity is located.

The supporting beam can play a role in reinforcing the bottom plate, so that the structural strength of the bottom plate is improved to a great extent; the die cavity in the bottom plate can absorb the external force impact from the bottom plate both sides on the one hand, is favorable to protecting the electric core, has improved the security of battery package, and on the other hand, the die cavity can be used as the liquid cooling runner, and the bottom plate can be regarded as the liquid cooling board this moment, supporting beam and bottom plate have between the die cavity place region and dodge the clearance and can prevent supporting beam and the die cavity region direct contact of bottom plate to can play the heat preservation effect to the heat transfer medium in the liquid cooling runner, guaranteed the bottom plate and also be the radiating efficiency of liquid cooling board to the electric core, simultaneously, the buffer clearance between supporting beam and the bottom plate can provide deformation displacement space for the bottom plate, has improved the shock resistance of the bottom sprag structure of battery case.

A battery pack comprises the battery box. The battery pack has high structural strength and high energy density.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of a battery box according to an embodiment of the present utility model;

fig. 2 is a schematic top view of a battery box according to an embodiment of the present utility model;

FIG. 3 is a schematic view in partial cross-section of the structure of section A-A of FIG. 2;

Fig. 4 is a schematic view of a first explosion structure of a battery box according to an embodiment of the present utility model;

fig. 5 is a schematic diagram of a second explosion structure of the battery box according to the embodiment of the present utility model.

Icon: 1. a bottom guard board; 2. a support beam; 21. a main body portion; 211. an avoidance groove; 22. a connection part; 3. a bottom plate; 31. an upper plate; 32. a lower plate; 321. a liquid cooling tank; 4. a battery compartment; 5. edge beams; 6. an inner beam; 7. a filler; i, avoiding gaps; II, buffering gaps; x, a first direction; y, second direction.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Referring to fig. 1 to 5, a battery box is applied to a battery pack and is at least used for accommodating a battery cell. Specifically, the battery box includes a bottom plate 3, a bottom shield plate 1, and a support beam 2, wherein: the bottom plate 3 is used for supporting a battery cell (not shown in the figure), and the bottom guard plate 1 is arranged on one side of the bottom plate 3 away from the battery cell; the supporting beam 2 is arranged between the bottom plate 3 and the bottom guard plate 1, namely, the supporting beam 2 is arranged at one side of the bottom plate 3 far away from the battery cell; a cavity is arranged in the bottom plate 3, and an avoidance gap I is formed between the support beam 2 and the area where the cavity of the bottom plate 3 is located.

The bottom plate 3, the bottom guard plate 1 and the supporting beam 2 form a bottom supporting structure of the battery box, are used for closing the bottom of a battery compartment 4 of the battery box, and at least provide supporting function for a plurality of battery cells assembled in the battery compartment 4.

The supporting beam 2 can play a role in reinforcing the bottom plate 3, so that the structural strength of the bottom plate 3 is improved to a great extent, and the bottom plate 3 can better provide support for the battery cells in the battery compartment 4 in the use process, and the bottom plate 3 or the supporting structure is prevented from deforming in the use process; the die cavity in the bottom plate 3 can absorb the external force impact from the bottom plate 3 both sides on the one hand, be favorable to protecting the electric core, the security of battery package has been improved, on the other hand, the die cavity can be used as the liquid cooling runner, this moment bottom plate 3 can be regarded as the liquid cooling board, have between the die cavity place region of supporting beam 2 and bottom plate 3 and dodge clearance I can prevent supporting beam 2 and the regional direct contact of die cavity of bottom plate 3, thereby can play the heat preservation effect to the heat transfer medium in the die cavity, bottom plate 3 also is the radiating efficiency of liquid cooling board to the electric core has been guaranteed, simultaneously, buffer clearance II between supporting beam 2 and the bottom plate 3 can provide deformation displacement space for bottom plate 3, the shock resistance of the bottom bearing structure of battery box has been improved.

In this embodiment, the bottom plate 3 is preferably a liquid cooling plate. So that the bottom plate 3 can effectively dissipate heat of the battery cell while providing a supporting function for the battery cell. Meanwhile, the supporting beam 2 can isolate the bottom plate 3 and the bottom guard plate 1 to a great extent, and prevent the bottom plate 3 and the bottom guard plate 1 from being in direct contact in a large area, so that a heat-insulating effect can be achieved on a heat exchange medium in a cavity, invalid heat exchange from the direction of the bottom guard plate 1 can be effectively reduced, and the heat dissipation efficiency of the bottom plate 3 to the battery cell is ensured.

In this embodiment, the support beam 2 is optionally welded to the floor 3.

As shown in fig. 3 to 5, the bottom plate 3 includes an upper plate 31 and a lower plate 32 that are attached to each other, a liquid cooling groove 321 is provided on the upper plate 31 and/or the lower plate 32, and when the upper plate 31 is attached to the lower plate 32, the liquid cooling groove 321 forms a cavity; the upper plate 31 is positioned between the lower plate 32 and the battery cell; the support beam 2 is located between the bottom fender 1 and the lower plate 32. The support beam 2 is welded to the lower plate 32.

Preferably, the liquid cooling tank 321 is disposed on the lower plate 32, and an avoidance gap i is provided between the support beam 2 and the bottom outer side surface of the liquid cooling tank 321. Specifically, the liquid cooling tank 321 is formed by punching a side surface of the lower plate 32 facing the upper plate 31. The upper plate 31 is of a flat plate structure and is disposed closer to the battery cells than the lower plate 32. The upper plate 31 of the flat plate structure can ensure that the contact area between the battery core and the bottom plate 3 is maximized, thereby being beneficial to improving the heat exchange efficiency of the battery core and the bottom plate.

Of course, in other embodiments, the liquid cooling groove 321 may be formed by stamping the upper plate 31, or the liquid cooling groove 321 may be formed by stamping both the upper plate 31 and the lower plate 32.

Further, the extending direction of the support beam 2 is arranged at an angle to the extending direction of at least part of the cavity of the bottom plate 3. As shown in fig. 4 and 5, the support beam 2 extends in a second direction Y, and the cavity in the middle region of the bottom plate 3 extends substantially in a first direction X, which is perpendicular to the second direction Y. In this embodiment, the liquid cooling grooves 321 formed by punching on the upper plate 31 or the lower plate 32 can play a role of reinforcing ribs for the corresponding upper plate 31 and lower plate 32, which is beneficial to improving the structural strength of the bottom plate 3.

However, this effect of improving structural strength is directional. Specifically, as shown in fig. 5, the liquid cooling grooves 321 in the middle region of the lower plate 32 extend along the first direction X, so that it becomes difficult to bend the lower plate 32 in the first direction X, that is, the liquid cooling grooves 321 extending along the first direction X increase the bending strength of the lower plate 32 in the first direction X; however, due to the existence of the liquid cooling grooves 321, the lower plate 32 is provided with a plurality of "creases" along the second direction Y, which means that it is easier to bend the lower plate 32 along the second direction Y than to bend the lower plate 32 along the first direction X, and the lower plate 32 is easy to deform in a manner of bending along the second direction Y when impacted. Therefore, in the embodiment, the structural design that the extending direction of the supporting beam 2 and the extending direction of at least part of the cavity of the bottom plate 3 form an included angle can effectively overcome the problem of deformation of the lower plate 32 caused by the arrangement of the liquid cooling groove 321.

Preferably, the extension direction of the support beam 2 is perpendicular to the extension direction of at least part of the cavity of the bottom plate 3. This arrangement allows the support beam 2 to better resist bending deformation of the lower plate 32 or the bottom plate 3 along at least part of the aforementioned cavity.

Further, as shown in fig. 3, an escape groove 211 is provided on a side surface of the support beam 2 facing the lower plate 32, and an escape gap i is provided between the bottom inner side surface of the escape groove 211 and the lower plate 32.

In the embodiment, the minimum width of the avoidance gap I is L1, and L1 is more than or equal to 1mm. The bottom outer side of the liquid cooling groove 321 on the lower plate 32 is located in the avoidance groove 211, and the minimum width of the avoidance gap i is the minimum distance between the bottom outer side of the liquid cooling groove 321 and the bottom inner side of the avoidance groove 211.

As shown in fig. 3 to 5, the support beam 2 includes a main body portion 21 and a connection portion 22 connected to each other, the connection portion 22 being connected to the floor 3; an escape gap I is provided between the main body 21 and the bottom plate 3. In this embodiment, the connection portion 22 is welded to the bottom plate 3. Further, the connection portions 22 are provided at both end portions in the extending direction of the main body portion 21. The region between the two connection portions 22 forms the escape groove 211.

The main body 21 and the connecting portion 22 may be integrally formed or may be provided separately. In this embodiment, the main body portion 21 and the connecting portion 22 are preferably integrally formed. Specifically, as shown in FIG. 3, the minimum distance between the connecting portion 22 and the cavity adjacent thereto is L3, and L3 is not less than 10mm. By the arrangement, the influence on the cavity structure in the welding process of the connecting part 22 can be avoided, and the reliability of the bottom plate 3 is ensured.

In a further embodiment, when the main body portion 21 and the connecting portion 22 are provided separately, both are welded.

In some embodiments, when the length of the support beam 2 is large, a filler 7 is provided between the support beam 2 and the bottom plate 3 to improve the rigidity of the support beam 2 and the connection strength between the support beam 2 and the bottom plate 3. The filler 7 is located in the non-cavity area of the bottom plate 3. At least one filling element 7 is arranged between the two connecting parts 22, or the filling element 7 is arranged at the bottom of the avoidance groove 211. When the number of the packing 7 is plural, plural connection portions 22 are provided at intervals between both end portions in the extending direction of the main body portion 21. The filler 7 may be made of metal such as aluminum, and the filler 7 is welded to the lower plate 32, adhered to the support beam 2, or welded.

In other embodiments, the partial filling 7 may also be a form-fitting foam. The heat insulation performance of the bottom plate 3 serving as a liquid cooling plate can be improved while supporting and reinforcing the supporting beam 2.

In this embodiment, the battery box further includes a side beam 5, the bottom plate 3 is connected to the side beam 5, and the projection of the connection portion 22 on the bottom plate 3 at least partially coincides with the projection of the corresponding side beam 5 on the bottom plate 3. So set up, the tie point distribution between tie point and boundary beam 5 and the tie point of bottom plate 3 of supporting beam 2 and bottom plate 3 is concentrated, and the atress is more even in bottom plate 3 upper and lower both sides, is favorable to improving the structural strength of battery box.

In this embodiment, as shown in fig. 4 and 5, a plurality of support beams 2 are provided, and a plurality of support beams 2 are provided at intervals. So as to fully ensure the structural strength of the battery box.

In this embodiment, the battery box further includes an inner beam 6, the inner beam 6 is located at a side of the bottom plate 3 away from the support beam 2, and an extending direction of the inner beam 6 is disposed at an included angle with an extending direction of the support beam 2. Preferably, the extension direction of the inner beam 6 is perpendicular to the extension direction of the support beam 2. By the arrangement, the inner beam 6 is matched with the supporting beam 2 to strengthen the bottom plate 3 in the extending direction, and the structural strength of the bottom plate 3 is further improved.

As shown in fig. 3, a buffer gap ii is provided between the support beam 2 and the bottom fender 1. The buffer clearance II between the supporting beam 2 and the bottom guard plate 1 can provide deformation displacement space for the bottom plate 3 or the bottom guard plate 1, so that the shock resistance of the bottom supporting structure of the battery box is improved. Specifically, when the bottom guard plate 1 is impacted, the bottom guard plate 1 can deform and displace toward the bottom plate 3 to absorb the impact energy; when the bottom plate 3 is impacted, the bottom plate 3 can deform and displace towards the bottom guard plate 1 to absorb the impact energy. By the arrangement, the bottom plate 3 or the bottom guard plate 1 can be prevented from being directly extruded to each other after being impacted, the probability of leakage of the bottom plate 3 when the bottom support structure of the battery box is impacted is reduced (the bottom plate 3 is used as a liquid cooling plate at the moment), and the safety of the battery box is improved. At the same time, the buffer gap II prevents the support beam 2 from directly contacting the bottom guard plate 1, and further reduces ineffective heat exchange from the direction of the bottom guard plate 1.

The buffer gap II can further improve the shock resistance of the bottom support structure on the basis of avoiding the gap I, and plays a role in buffering. Specifically, when the bottom guard plate 1 is impacted and deforms towards the direction of the bottom plate 3, the deformation displacement absorbing part energy passing through the buffer gap II is abutted to the supporting beam 2, after the supporting beam 2 is stressed and deformed, the inner side surface of the bottom of the avoidance groove 211 deforms and displaces in the avoidance gap I towards the direction of the bottom plate 3, and impact energy is continuously absorbed in the process, so that the supporting beam 2 can be prevented from directly impacting the bottom plate 3, and the safety is improved.

Furthermore, the minimum width of the buffer clearance II is L2, and L2 is more than or equal to 3mm. In this embodiment, preferably, l2=3 mm. So arranged, on the one hand, sufficient deformation displacement space can be provided for the bottom guard plate 1 or the bottom plate 3; on the other hand, the thickness of the bottom supporting structure of the battery box is not too large. In other embodiments, l2=3.5 mm, 4mm or 5mm.

As shown in fig. 3, the side surface of the support beam 2 facing the bottom guard plate 1 is preferably disposed in parallel with the inner side surface of the region corresponding to the bottom guard plate 1.

It should be noted that the bottom plate 3 is not only used in the case of heat dissipation of the battery cells. For example, under the working condition that the battery cell in the battery compartment 4 needs to be heated, heat can be transferred to the battery cell by heating the heat exchange medium in the bottom plate 3, and the temperature of the heat exchange medium is higher than that of the battery cell at the moment; most of the working conditions are conventional heat dissipation working conditions, namely the working conditions mentioned in the foregoing description, and the temperature of the heat exchange medium is lower than that of the battery cell.

The embodiment also provides a battery pack, which comprises a battery cell and the battery box, wherein the battery cell is arranged in the battery compartment 4. The battery pack has high structural strength and high energy density.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims

1. A battery box, comprising:

A bottom plate (3) for supporting the battery cell;

the support beam (2) is arranged on one side of the bottom plate (3) far away from the battery cell;

A cavity is formed in the bottom plate (3), and an avoidance gap (I) is formed between the support beam (2) and the area where the cavity of the bottom plate (3) is located.

2. The battery box according to claim 1, characterized in that the minimum width of the avoidance gap (i) is L1, L1 being equal to or greater than 1mm.

3. The battery box according to claim 1, characterized in that the extension direction of the support beam (2) is arranged at an angle to the extension direction of at least part of the mould cavity.

4. The battery box according to claim 1, wherein the bottom plate (3) comprises an upper plate (31) and a lower plate (32) which are mutually attached, a liquid cooling groove (321) is arranged on the upper plate (31) and/or the lower plate (32), and the liquid cooling groove (321) forms the cavity when the upper plate (31) is attached to the lower plate (32);

The upper plate (31) is positioned between the lower plate (32) and the battery cell;

The supporting beam (2) is fixedly connected with the lower plate (32).

5. The battery box according to claim 4, wherein the liquid cooling tank (321) is provided to the lower plate (32);

The avoidance gap (I) is formed between the support beam (2) and the outer side surface of the bottom of the liquid cooling groove (321).

6. The battery box according to claim 4 or 5, characterized in that a side surface of the support beam (2) facing the lower plate (32) is provided with an avoidance groove (211), and the avoidance gap (i) is formed between the bottom inner side surface of the avoidance groove (211) and the lower plate (32).

7. The battery box according to claim 1, characterized in that the support beam (2) comprises a body portion (21) and a connecting portion (22) connected to each other;

The connecting part (22) is connected to the bottom plate (3);

The main body part (21) and the bottom plate (3) are provided with the avoidance gap (I).

8. The battery box according to claim 7, wherein the connection portions (22) are provided at both end portions of the main body portion (21) in the extending direction.

9. The battery box according to claim 7, characterized in that the battery box further comprises a side rail (5), the projection of the connection (22) onto the bottom plate (3) at least partially coinciding with the projection of the corresponding side rail (5) onto the bottom plate (3).

10. The battery box according to claim 1, characterized in that the support beam (2) is welded to the bottom plate (3).

11. The battery box according to claim 1, wherein the number of the support beams (2) is plural, and the plurality of the support beams (2) are arranged at intervals.

12. The battery box according to claim 7, characterized in that a filler (7) is arranged between the support beam (2) and the bottom plate (3), the filler (7) being located in a non-cavity area of the bottom plate (3).

13. The battery box according to claim 1, characterized in that the battery box further comprises an inner beam (6), the inner beam (6) being located at a side of the bottom plate (3) remote from the support beam (2), the extension direction of the inner beam (6) being arranged at an angle to the extension direction of the support beam (2).

14. The battery box according to claim 1, characterized in that a buffer gap (ii) is provided between the support beam (2) and the bottom guard plate (1).

15. A battery pack comprising a battery compartment according to any one of claims 1-14.