CN221150141U - Battery device - Google Patents

Abstract

The application discloses a battery device, which relates to the technical field of batteries, and comprises a battery and a heat exchange plate, wherein the heat exchange plate comprises a bottom plate and two side plates; the two side plates are oppositely arranged at two sides of the bottom plate, so that a space for accommodating the battery pack is formed between the bottom plate and the two side plates; the junction of bottom plate and curb plate of at least one side is provided with the enhancement part. By adopting the structural design, the heat exchange plate is designed into a U-shaped structure by utilizing the bottom plate and the two side plates, and the heat exchange plate with the U-shaped structure can exchange heat for the bottom surface and the two opposite side surfaces of the battery pack, so that the heat exchange balance effect of the battery pack can be improved; in addition, through set up the enhancement portion in the junction of bottom plate and curb plate, can improve the structural strength of the junction of bottom plate and curb plate, be difficult for taking place deformation between bottom plate and the curb plate for bottom plate and curb plate can contact with the surface of group battery better, help promoting heat exchange efficiency.

Description

Battery device

Technical Field

The application relates to the technical field of batteries, in particular to a battery device.

Background

In the prior art, a battery device includes a battery pack and a heat exchange plate; in order to be able to meet the temperature requirement of normal operation of the battery device, the heat exchange plate is usually arranged on the outer surface of the battery pack, and meanwhile, in order to ensure the overall heat exchange balance of the battery pack, the heat exchange plate can be designed into a multi-plate structure, and the heat exchange plate of the multi-plate structure comprises a plurality of connected panels.

But the junction of two adjacent panels in the heat exchange plate of multiaspect board structure generally adopts the processing of bending, and the structural strength of this junction after bending is weaker relatively, and after the group battery was placed in the heat exchange plate of multiaspect board structure, the junction of two adjacent panels was extruded to the group battery, easily makes to take place to warp between two adjacent panels for the surface contact of panel and group battery can not be fine, and then influence the panel and carry out effectual heat transfer to the group battery, reduced heat exchange efficiency.

Disclosure of utility model

In view of the above, the present application is directed to a battery device for solving the technical problems of the prior art that the connection between two adjacent panels in the heat exchange plate of the multi-panel structure has poor structural strength and is easy to cause low heat exchange efficiency.

In order to achieve the above purpose, the present application provides the following technical solutions:

The application provides a battery device, which comprises a battery pack and a heat exchange plate, wherein the heat exchange plate comprises a bottom plate and two side plates;

The two side plates are oppositely arranged at two sides of the bottom plate, so that a space for accommodating the battery pack is formed between the bottom plate and the two side plates;

The junction of bottom plate and at least one side the curb plate is provided with the enhancement portion.

Compared with the prior art, the technical scheme has the following beneficial effects:

In the battery device, the heat exchange plate can be designed into a U-shaped structure by utilizing the bottom plate and the two side plates, and the heat exchange plate with the U-shaped structure can exchange heat for the bottom surface of the battery pack and the two opposite side surfaces, so that the heat exchange balance effect of the battery pack can be improved; in addition, through set up the enhancement portion in the junction of bottom plate and the curb plate of at least one side, can improve the structural strength of the junction of bottom plate and curb plate, be difficult for taking place deformation between bottom plate and the curb plate for bottom plate and curb plate can contact with the surface of group battery better, help promoting heat exchange efficiency.

Drawings

In order that the advantages of the application will be readily understood, a more particular description of the application briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the application and are not therefore to be considered to be limiting of its scope, the application will be described and explained with additional specificity and detail through the use of the accompanying drawings.

Fig. 1 is a schematic perspective view of a battery device according to an exemplary embodiment;

Fig. 2 is a schematic perspective view illustrating a battery pack according to an exemplary embodiment;

Fig. 3 is a schematic perspective view of a heat exchange plate according to an exemplary embodiment;

FIG. 4 is a schematic diagram of a front view of a heat exchanger plate with a reinforcement portion disposed on a side of the heat exchanger plate remote from the battery pack, according to an exemplary embodiment;

FIG. 5 is a schematic view of a front view of another heat exchange plate with a reinforcement portion disposed on a side of the heat exchange plate adjacent to a battery pack according to an exemplary embodiment;

FIG. 6 is a schematic view of a front cut-away structure of a heat exchange plate according to an exemplary embodiment;

Fig. 7 is a schematic diagram of a front cut-away structure of a base plate, according to an example embodiment.

The reference numerals are as follows:

1-battery pack, 11-bottom, 12-side;

2-heat exchange plates, 21-bottom plates, 211-upper plates, 212-lower plates, 213-spacers, 2131-first spacers, 2132-second spacers, 22-side plates, 221-inner plates, 222-outer plates, 23-bottom cavities, 24-corner runners, 25-side runners;

3-reinforcement.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present application. It will be apparent, however, to one skilled in the art that embodiments of the application may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the embodiments of the application.

In the description of the application, the term "a and/or B" means all possible combinations of a and B, such as a alone, B alone or a and B, the term "at least one a or B" or "at least one of a and B" has a meaning similar to "a and/or B" and may include a alone, B alone or a and B; the singular forms "a", "an" and "the" include plural referents; the terms "inboard", "outboard", "longitudinal", "transverse", "upper", "lower", "top", "bottom", etc. indicate an orientation or positional relationship based on that shown in the drawings, are merely for convenience of description of the application and do not require that the application must be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Moreover, in the description of the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. Furthermore, the terms "exemplary" and "illustration" mean "serving as an example, embodiment, or illustration," any implementation of the application described as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments, and although various aspects of the embodiments are shown in the figures, the figures are not necessarily drawn to scale unless specifically indicated. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

In order to facilitate understanding of the battery device provided by the application, an application scene is described first, in the prior art, in order to meet the temperature requirement of normal operation of the battery device, a heat exchange plate is usually arranged on the outer surface of a battery pack, meanwhile, in order to ensure the overall heat exchange balance of the battery pack, the heat exchange plate can be designed into a multi-plate structure, the heat exchange plate of the multi-plate structure comprises a plurality of connected panels, generally, the panels are arranged on the bottom and peripheral surfaces of the battery pack, and the panels are contacted with different outer surfaces of the battery pack to exchange heat for the outer surfaces of the battery pack; but the junction of two adjacent panels in the heat exchange plate of multiaspect board structure generally adopts the processing of bending, and the structural strength of this junction after bending is weaker relatively, and after the group battery was placed in the heat exchange plate of multiaspect board structure, the junction of two adjacent panels was extruded to the group battery, easily makes to take place to warp between two adjacent panels for the surface contact of panel and group battery can not be fine, and then influence the panel and carry out effectual heat transfer to the group battery, reduced heat exchange efficiency.

Therefore, the application provides a battery device, thereby solving the technical problems that the connecting part of two adjacent panels in the heat exchange plate of the multi-plate structure in the prior art has poor structural strength and is easy to cause low heat exchange efficiency.

The technical solution of the present embodiment is described in detail below with reference to the accompanying drawings, and the following embodiments and implementations may be combined with each other without conflict.

In an exemplary embodiment of the present application, a battery device is provided, as shown in fig. 1 to 7, fig. 1 is a schematic perspective view of a battery device according to an exemplary embodiment; fig. 2 is a schematic perspective view illustrating a battery pack according to an exemplary embodiment; fig. 3 is a schematic perspective view of a heat exchange plate according to an exemplary embodiment; FIG. 4 is a schematic diagram of a front view of a heat exchanger plate with a reinforcement portion disposed on a side of the heat exchanger plate remote from the battery pack, according to an exemplary embodiment; FIG. 5 is a schematic view of a front view of another heat exchange plate with a reinforcement portion disposed on a side of the heat exchange plate adjacent to a battery pack according to an exemplary embodiment; FIG. 6 is a schematic view of a front cut-away structure of a heat exchange plate according to an exemplary embodiment; fig. 7 is a schematic diagram of a front cut-away structure of a base plate, according to an example embodiment.

As shown in fig. 1, the battery device comprises a battery pack 1 and a heat exchange plate 2, wherein the heat exchange plate 2 covers the outer surface of the battery pack 1 and can exchange heat for the battery pack 1 so as to meet the temperature requirement for enabling the battery pack 1 to work normally.

In the present embodiment, the heat exchange plate 2 includes a bottom plate 21 and two side plates 22; the two side plates 22 are oppositely arranged at two sides of the bottom plate 21, so that the heat exchange plate 2 is of a U-shaped structure as a whole, and the inner side of the heat exchange plate 2 with the U-shaped structure can be used for placing the battery pack 1, namely, a space for accommodating the battery pack 1 is formed between the bottom plate 21 and the two side plates 22 in the heat exchange plate 2. Specifically, the bottom plate 21 may act on the bottom surface 11 of the battery pack 1 and exchange heat for the bottom surface 11 of the battery pack 1, and the two side plates 22 act on the two side surfaces 12 disposed opposite to the battery pack 1 and exchange heat for the two side surfaces 12.

It should be noted that, the battery pack 1 is generally in a cuboid structure, and the bottom plate 21 of the heat exchange plate 2 is disposed on the bottom surface 11 of the battery pack 1, and the side plate 22 of the heat exchange plate 2 is disposed on the side surface 12 of the battery pack 1, so that an included angle between the bottom plate 21 and the side plate 22 can be designed to be 90 °, so that the bottom plate 21 and the side plate 22 can be attached to the corresponding outer surface of the battery pack 1, and further the heat exchange effect of the heat exchange plate 2 on the battery pack 1 can be improved. Of course, according to the structure of the battery pack 1, and in order to make the bottom plate 21 more fit to the bottom surface 11 of the battery pack 1 and make the side plate 22 more fit to the side surface 12 of the battery pack 1, the angle between the bottom plate 21 and the side plate 22 may be adaptively adjusted, for example, the angle between the bottom plate 21 and the side plate 22 may be 85 °, 105 °, etc.

In the present embodiment, as shown in fig. 1, 3 to 6, a reinforcing portion 3 is provided at the junction of the bottom plate 21 and at least one side plate 22. Specifically, a part of the reinforcing portion 3 is connected to the bottom plate 21 at a position close to the side plate 22, and another part of the reinforcing portion 3 is connected to the side plate 22 at a position close to the bottom plate 21, whereby the structural strength of the connection between the bottom plate 21 and the side plate 22 in the heat exchange plate 2 can be consolidated by the reinforcing portion 3.

Preferably, the connection between the bottom plate 21 and the two side plates 22 is provided with a reinforcing part 3 to improve the overall structural strength of the heat exchange plate 2 in a U-shaped structure.

Illustratively, the reinforcement 3 may be one unbroken integral part arranged along the extension of the junction of the bottom plate 21 and the side plate 22; wherein, the extending direction of the connection of the bottom plate 21 and the side plate 22 is parallel to the bottom surface 11 and the side surface 12 of the battery pack 1.

Illustratively, the reinforcement 3 may also be a plurality of members disposed at intervals along the extending direction of the junction of the bottom plate 21 and the side plate 22; preferably, the plurality of members are uniformly arranged along the extending direction of the junction of the bottom plate 21 and the side plate 22.

Alternatively, as shown in fig. 4, the reinforcement 3 is provided at the side of the heat exchange plate 2 remote from the battery pack 1. That is, it can be understood that the reinforcement 3 is provided outside the heat exchange plate 2; by adopting the arrangement mode, when the battery pack 1 carries the heat exchange plate 2 and is arranged in the battery box body, the reinforcing part 3 is positioned between the heat exchange plate 2 and the battery box body, and the reinforcing part 3 can effectively prevent the battery box body from being extruded to damage the corner of the heat exchange plate 2 (namely the joint of the bottom plate 21 and the side plate 22).

Alternatively, as shown in fig. 5, the reinforcement 3 is provided at the side of the heat exchange plate 2 near the battery pack 1. That is, it can be understood that the reinforcement 3 is provided inside the heat exchange plate 2; by adopting the arrangement mode, when the battery pack 1 is arranged in the space for accommodating the battery pack 1 in the heat exchange plate 2, the reinforcing part 3 is positioned between the battery pack 1 and the heat exchange plate 2, and the corner of the heat exchange plate 2 can be effectively prevented from being damaged by extrusion of the battery pack 1.

It should be understood that the reinforcing part 3 may also be simultaneously arranged on the side of the heat exchange plate 2 far from the battery pack 1 and on the side of the heat exchange plate 2 close to the battery pack 1, so as to further improve the overall structural strength of the whole heat exchange plate 2.

By adopting the structural design, the heat exchange plate 2 is designed into a U-shaped structure by utilizing the bottom plate 21 and the two side plates 22, and the heat exchange plate 2 with the U-shaped structure can exchange heat for the bottom surface 11 and the two side surfaces 12 which are oppositely arranged of the battery pack 1, so that the heat exchange balance effect of the battery pack 1 can be improved; in addition, through set up reinforcing part 3 in the junction of bottom plate 21 and curb plate 22, can improve the structural strength of the junction of bottom plate 21 and curb plate 22, guarantee difficult emergence deformation between bottom plate 21 and the curb plate 22 for bottom plate 21 and curb plate 22 can contact with the surface of group battery 1 better, help promoting heat exchange efficiency.

In some exemplary embodiments, as shown in fig. 6 and 7, the bottom plate 21 of the heat exchanger plate 2 comprises an upper plate 211, a lower plate 212 and several spacers 213. Specifically, the upper plate 211 and the lower plate 212 are disposed opposite to each other, the upper plate 211 is disposed on the side of the bottom plate 21 facing the battery pack1, and the lower plate 212 is disposed on the side of the bottom plate 21 facing away from the battery pack 1; the spacer 213 has both ends connected to the upper plate 211 and the lower plate 212, respectively, to divide the space between the upper plate 211 and the lower plate 212 into a plurality of bottom cavities 23 arranged side by side. A heat exchange medium flows in the bottom cavity 23, and heat exchange is performed on the bottom surface 11 of the battery pack1 by the flow of the heat exchange medium in the bottom cavity 23.

Optionally, the ratio c of the sum of the thicknesses of the plurality of spacers 213 along the first direction to the sum of the widths of the plurality of bottom cavities 23 along the first direction is in the range of: c is more than or equal to 0.015 and less than or equal to 0.15; for example, the ratio c has a value of 0.015, 0.02, 0.05, 0.1, 0.15, etc. The first direction is an arrangement direction of the plurality of bottom cavities 23. Since the battery pack 1 is arranged on the bottom plate 21, the bottom plate 21 needs to have larger bearing capacity, the bearing capacity of the bottom plate 21 can be improved by adding the number of the spacers 213 or increasing the thickness of the spacers 213, so the ratio c is not too small, otherwise, the bearing capacity of the bottom plate 21 is poor, the supporting strength is insufficient, meanwhile, the side plate 22 connected with the bottom plate 21 is easy to deform, the side plate 22 can deform in a V shape or an inverted V shape, the side plate 22 can deform so that the side plate 22 cannot better contact the outer surface of the battery pack 1, the heat exchange efficiency is affected, the side plate 22 can squeeze the battery pack 1 due to the deformation of the side plate 22, and the battery pack 1 is damaged or a sufficient expansion space cannot be provided for the battery pack 1; the ratio c should not be too large, otherwise the width of the bottom cavity 23 is narrower, which would affect the heat exchange effect.

The thickness of the spacer 213 in the first direction refers to the widest thickness of the spacer 213 in the first direction; the width of the bottom cavity 23 in the first direction means the widest width of the bottom cavity 23 in the first direction.

Further, in the bottom plate 21, the spacer 213 provided at least one end in the first direction is a first spacer 2131, and the spacers 213 other than the first spacer 2131 are second spacers 2132; the thickness of the first separator 2131 in the first direction is greater than the thickness of the second separator 2132 in the first direction. Because the battery pack 1 is arranged on the bottom plate 21, in general, the place with the largest bearing pressure of the bottom plate 21 is the edge position close to the periphery of the bottom of the battery pack 1, and the bending part of the bottom plate 21 and the side plate 22 is the weak part of the structural strength of the heat exchange plate 2 aiming at the heat exchange plate 2 with the U-shaped structure, the stress concentration is easy to occur at the weak part, in addition, the battery pack 1 can vibrate in the actual use process, the phenomena of damage, liquid leakage and the like of the heat exchange plate 2 are easy to cause, and the heat exchange effect is affected. Therefore, the spacer 213 in the vicinity of the weak portion of the heat exchange plate 2 is thickened, so that the supporting effect on the battery pack 1 can be enhanced, and the supporting strength of the bottom plate 21 and the entire heat exchange plate 2 can be enhanced.

Preferably, the first separator 2131 is two, and the two first separators 2131 are provided at both ends in the first direction in the bottom plate 21. With the design of the two first spacers 2131, the supporting strength of the bottom plate 21 in both sides in the first direction can be improved.

Alternatively, as shown in fig. 7, in the bottom plate 21, the thickness of the first separator 2131 along the first direction is set as D1, the thickness of the second separator 2132 along the first direction is set as D2, and the ratio D1/D2 of D1 to D2 is set as: D1/D2 is less than or equal to 1.01 and less than or equal to 3. For example, the ratio D1/D2 has a value of 1.01, 1.2, 1.5, 1.8, 2, 2.4, 2.6, 2.8, 3, etc. The ratio D1/D2 should not be too large, otherwise, the middle position area of the bottom plate 21 is easy to collapse, which affects the contact area between the battery pack 1 and the middle position area of the bottom plate 21, and further affects the heat exchange effect; the ratio D1/D2 is not too small, which would not cause an insignificant increase in the thickness of the first separator 2131 relative to the second separator 2132, and thus the separator 213 (i.e., the first separator 2131) in the vicinity of the weak portion of the heat exchange plate 2 has limited supporting effect on the lifting battery pack 1, and the weak portion of the heat exchange plate 2 where the bottom plate 21 is connected with the side plate 22 is easily damaged.

In some exemplary embodiments, as shown in fig. 6, the inside of the junction of the bottom plate 21 and the side plate 22 is provided with a corner flow passage 24; the cross section of the corner runner 24 formed by the first surface is L-shaped; wherein the first surface is perpendicular to the surface of the battery pack 1 facing the side of the bottom plate 21, and the first surface is parallel to the first direction; the first direction is the arrangement direction of the plurality of bottom cavities 23. The heat exchange medium flows in the corner flow channel 24, the heat exchange medium flows downwards due to the action of gravity, and after the heat exchange medium collides with the separator 213, a rebound force is generated, and the rebound force has a certain blocking effect on the normal flow of the heat exchange medium and is unfavorable for the flow of the heat exchange medium, so that the corner flow channel 24 is designed into a structure with an L-shaped cross section, the width of the corner flow channel 24 in the first direction can be increased, the path of the heat exchange medium contacting with the separator 213 is prolonged, and the space at the bottom of the corner flow channel 24 can be utilized to offset the influence of the rebound force on the normal flow of the heat exchange medium, thereby improving the flow rate of the heat exchange medium. In addition, heat exchange can be performed at the bottom corner of the battery pack 1 by the flow of the heat exchange medium in the corner flow channels 24.

It should be noted that the corner runner 24 may be in communication with the bottom cavity 23.

In some exemplary embodiments, as shown in fig. 6, the interior of the side plate 22 of the heat exchange plate 2 is provided with a plurality of side flow channels 25 arranged side by side in the second direction; the second direction is a direction perpendicular to a surface of the battery pack 1 on a side facing the bottom plate 21. Specifically, the side plate 22 includes an inner plate 221 and an outer plate 222, the inner plate 221 and the outer plate 222 are disposed opposite to each other, the inner plate 221 is disposed on a side of the side plate 22 facing the battery pack 1, and the outer plate 222 is disposed on a side of the side plate 22 facing away from the battery pack 1; the side flow channels 25 are disposed between the inner plate 221 and the outer plate 222. A heat exchange medium flows in the side flow channels 25, and heat exchange is performed for the side surfaces 12 of the battery pack 1 by the flow of the heat exchange medium in the side flow channels 25.

The side runners 25 may be in communication with the corner runners 24 and may also be in communication with the bottom cavity 23 through the corner runners 24.

In some exemplary embodiments, in the bottom plate 21 of the heat exchange plate 2, the thickness of the lower plate 212 in the second direction is greater than the thickness of the upper plate 211 in the second direction; and/or, in the side plate 22 of the heat exchange plate 2, the thickness of the outer plate 222 in the first direction is greater than the thickness of the inner plate 221 in the first direction. By adopting the structural design, the structural strength of the panel at the outer side of the heat exchange plate 2 can be further enhanced.

The embodiment discloses a battery device, which comprises a battery pack 1 and a heat exchange plate 2, wherein the heat exchange plate 2 is designed into a U-shaped structure and can exchange heat for three surfaces of the battery pack 1, so that the heat exchange efficiency can be improved and the heat exchange balance of two sides of the battery pack 1 can be ensured; in addition, through setting up the reinforcing part 3 in the junction of bottom plate 21 and curb plate 22 in heat transfer board 2, can improve the overall structure intensity of heat transfer board 2, especially the structural strength of the junction of bottom plate 21 and curb plate 22, guarantee difficult emergence deformation between bottom plate 21 and the curb plate 22 for bottom plate 21 and curb plate 22 can contact with the surface of group battery 1 better, help promoting heat exchange efficiency, and can effectively avoid heat transfer board 2 to warp impaired.

While the fundamental and principal features of the application and advantages of the application have been shown and described, it will be apparent to those skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (9)

1. A battery device comprising a battery pack and a heat exchange plate, wherein the heat exchange plate comprises a bottom plate and two side plates;

The two side plates are oppositely arranged at two sides of the bottom plate, so that a space for accommodating the battery pack is formed between the bottom plate and the two side plates;

The junction of bottom plate and at least one side the curb plate is provided with the enhancement portion.

2. The battery device according to claim 1, wherein the reinforcement portion is provided on a side of the heat exchange plate away from the battery pack; and/or the reinforcing part is arranged on one side of the heat exchange plate, which is close to the battery pack.

3. The battery device according to claim 1 or 2, wherein the bottom plate includes an upper plate, a lower plate, and a plurality of spacers;

the upper plate and the lower plate are oppositely arranged, the upper plate is arranged on one side of the bottom plate facing the battery pack, and the lower plate is arranged on one side of the bottom plate facing away from the battery pack;

the two ends of the isolating piece are respectively connected with the upper plate and the lower plate so as to separate the space between the upper plate and the lower plate into a plurality of bottom cavities which are arranged side by side;

The ratio c of the sum of the thicknesses of the plurality of spacers along the first direction to the sum of the widths of the plurality of bottom cavities along the first direction is as follows: c is more than or equal to 0.015 and less than or equal to 0.15;

The first direction is the arrangement direction of the plurality of bottom cavities.

4. The battery device according to claim 3, wherein in the bottom plate, the separator provided at least one end in the first direction is a first separator, and the other separator than the first separator is a second separator;

the thickness of the first spacer along the first direction is greater than the thickness of the second spacer along the first direction.

5. The battery device according to claim 4, wherein in the bottom plate, a thickness of the first separator in the first direction is set to D1, a thickness of the second separator in the first direction is set to D2, and a ratio D1/D2 of D1 to D2 is set to a value in a range of: D1/D2 is less than or equal to 1.01 and less than or equal to 3.

6. The battery device according to claim 3, wherein a corner flow passage is provided inside a junction of the bottom plate and the side plate;

the cross section of the corner runner formed by the first surface is L-shaped;

The first surface is perpendicular to the surface of the battery pack facing one side of the bottom plate, and the first surface is parallel to the first direction.

7. The battery device according to claim 3, wherein the side plate is provided inside with a plurality of side flow passages arranged side by side in the second direction; wherein the second direction is a direction perpendicular to a surface of the battery pack facing the side of the base plate.

8. The battery device according to claim 7, wherein the side plate includes an inner plate and an outer plate, the inner plate and the outer plate being disposed opposite to each other, the inner plate being disposed on a side of the side plate facing the battery pack, the outer plate being disposed on a side of the side plate facing away from the battery pack;

The side flow passage is disposed between the inner plate and the outer plate.

9. The battery device according to claim 8, wherein a thickness of the lower plate in the second direction is greater than a thickness of the upper plate in the second direction; and/or the thickness of the outer plate along the first direction is greater than the thickness of the inner plate along the first direction.