CN213752908U

CN213752908U - Battery box

Info

Publication number: CN213752908U
Application number: CN202022605364.6U
Authority: CN
Inventors: 唐城琨; 田瑞生; 马铁波
Original assignee: China Aviation Lithium Battery Co Ltd; CALB Technology Co Ltd
Current assignee: Avic Innovation Technology Research Institute Jiangsu Co ltd; China Aviation Lithium Battery Co Ltd; China Lithium Battery Technology Co Ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-07-20
Anticipated expiration: 2030-11-11

Abstract

The application relates to the field of batteries and discloses a battery box and a battery pack. This battery box includes box and heat transfer board, and the box includes the curb plate, wherein: a cavity for containing a heat exchange medium is arranged in the heat exchange plate, and an opening of the cavity is positioned on the first side surface of the heat exchange plate; the side plate comprises a first sub-plate arranged opposite to the first side surface of the heat exchange plate; a connecting piece is arranged between the first side surface of the heat exchange plate and the first sub-plate, and the opening of the cavity is blocked by the connecting piece; and along the circumferential direction of the first side face, one side of the connecting piece facing the heat exchange plate is welded with the first side face to form a sealing frame, and the opening of the cavity is positioned in the surrounding area of the sealing frame. Utilize this battery box to be used for solving in the current battery box because welding problem leads to heat transfer board and curb plate to have the gap and then lead to the heat transfer medium in the heat transfer board to take place the problem of leaking.

Description

Battery box

Technical Field

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

Background

The battery box of battery package includes heat transfer board and curb plate, and the curb plate sets up along the circumference of heat transfer board, and the battery box is used for installing fixed battery or battery module. The heat exchange plate is usually provided with a cavity for accommodating a heat exchange medium, and a heat transfer medium is introduced into the cavity to regulate the temperature of the battery pack, such as cooling, heating and the like. Wherein at least one side of the heat exchanger plates is provided with an opening of the cavity, which opening is normally sealed with a side plate when assembled, in order to seal the heat exchange medium in the cavity. In the existing assembly mode, the side plates are generally assembled, and then the heat exchange plates and the side plates are welded. And the curb plate includes the daughter board of polylith end to end usually, there is the angle in being connected between daughter board and the daughter board, wherein, junction between two daughter boards forms the corner, like this, when welding heat transfer plate and curb plate, because in welding process such as friction weld, welder can not reach the corner position basically, consequently, can be because the welding is incomplete to form the gap between heat transfer plate and the curb plate in the corner between heat transfer plate and the curb plate, cause unable complete sealing between heat transfer plate and the curb plate, from this, can lead to the heat transfer medium in the heat transfer plate cavity to take place the seepage along the gap between heat transfer plate and the curb plate.

SUMMERY OF THE UTILITY MODEL

The application discloses battery box for solve in the current battery box because the welding problem leads to heat transfer board and curb plate to have the gap and then lead to the heat transfer medium in the heat transfer board to take place the problem of leaking.

In order to achieve the purpose, the application provides the following technical scheme:

in a first aspect, the present application provides a battery box, including box and heat transfer board, the box includes the curb plate, wherein: the heat exchange plate is internally provided with a cavity for accommodating a heat exchange medium, and an opening of the cavity is positioned on the first side surface of the heat exchange plate; the side plate comprises a first sub-plate arranged opposite to the first side face of the heat exchange plate; a connecting piece is arranged between the first side surface of the heat exchange plate and the first sub-plate, and the connecting piece blocks the opening of the cavity; and along the circumferential direction of the first side face, one side of the connecting piece facing the heat exchange plate and the first side face are welded to form a sealing frame, and the opening of the cavity is positioned in the enclosing area of the sealing frame.

The beneficial effects that adopt this application's technical scheme to produce are as follows:

the application provides a battery box includes box and heat transfer board, wherein the box includes the curb plate, the cavity opening of heat transfer board is located the first side of heat transfer board, first daughter board in the curb plate sets up with the first side of heat transfer board relatively, be equipped with the connecting piece between the first side of heat transfer board and the first daughter board of curb plate, this connecting piece is used for the opening of shutoff heat transfer board cavity, in the circumference along the first side, the connecting piece forms sealed frame towards one side and the first side welding of heat transfer board, wherein, the opening of cavity is located enclosing of sealed frame and establishes the region. Therefore, by arranging the connecting piece, the sealing frame can be formed between the heat exchange plate and the connecting piece firstly, and then the sealing frame is connected with the side plate, so that the cavity opening of the heat exchange plate is completely sealed by the connecting piece, and the heat exchange medium in the heat exchange plate is prevented from seeping out of the heat exchange plate.

Drawings

Fig. 1 is a schematic structural diagram of a battery box according to an embodiment of the present application;

FIG. 2 is a partial positional relationship diagram of side plates, connectors, and heat exchange plates in a battery box according to an embodiment of the present application;

FIG. 3 is a schematic view of a connection member, a heat exchange plate and a side plate according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a welding portion where the connection member is connected to the heat exchange plate and the side plate according to an embodiment of the present application.

FIG. 5 is a schematic view of the connection structure between the end of the connector and the heat exchange plate and the side plate in the battery box according to an embodiment of the present application;

fig. 6 is a schematic view of a connection structure of the end portions of the connection members with the heat exchange plates and the side plates in the battery box according to another embodiment of the present application.

Reference numerals: 10-heat exchange plates; 101-mounting a beam; 20-side plate; 201 a-a first daughter board, 201 b-a second daughter board; 201 c-a third daughter board; 201 d-a fourth daughter board; 202-a first gap; 203-a second gap; 30-a connector; 411-opening; 412-a first boss; 421-groove; 422-second raised portion.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In a first aspect, the embodiment of the present application provides a battery box. Fig. 1 is a schematic structural diagram of a battery box according to an embodiment of the present application, and as shown in fig. 1, the battery box includes a box body and a heat exchange plate 10, the box body includes a side plate 20, wherein a cavity for accommodating a heat exchange medium is disposed inside the heat exchange plate 10, and an opening of the cavity is located at a first side surface of the heat exchange plate 10. The side plate 20 comprises at least one first sub-plate 201a, which first sub-plate 201a is arranged opposite to a first side of the heat exchanger plate 10. Fig. 2 is a schematic structural diagram of a joint between a side plate and a heat exchange plate according to an embodiment of the present application. As shown in fig. 2, a connection member 30 is provided between the first side of the heat exchanger plate 10 and the first sub-plate 201a of the side plate 20. The connecting piece plugs the opening of the cavity, and one side of the connecting piece 30 facing the heat exchange plate 10 is welded with the first side of the heat exchange plate 10 to form a sealing frame, the sealing frame is continuously arranged along the circumference of the first side of the heat exchange plate 10, and the opening of the cavity is located in the enclosing area of the sealing frame.

The battery box that this application embodiment provided, because form the sealed frame between the first side of connecting piece 30 and heat transfer board 10, this sealed frame sets up along the circumference of the first side of heat transfer board 10, and the opening of the cavity of heat transfer board 10 is located enclosing of this sealed frame and establishes the region to can realize the complete sealing of heat transfer board 10, avoid the heat transfer medium among the heat transfer board 10 to take place the seepage.

It can be understood that, in the heat exchange plate provided in the embodiments of the present application, the opening of the cavity may be disposed on a single side surface of the heat exchange plate, or may be disposed on two opposite side surfaces of the heat exchange plate. When the opening of the cavity is arranged on one side, the first side surface corresponds to one side surface of the heat exchange plate; when the opening of the cavity is bilaterally arranged, the first side comprises two oppositely arranged sides of the heat exchanger plate.

The battery box that this application embodiment provided, when the equipment, can weld connecting piece and heat transfer board earlier, form between the two behind the sealing frame with the curb plate welding.

In an embodiment of the present application, a side of the connection member 30 facing the first sub-board 201a is fixedly connected to the first sub-board, for example, by welding, and the first sub-board 201a is welded to the connection member 30 by friction welding. Since the sealing frame is formed between the connection member 30 and the heat exchange plate 10, when the surface friction welding is adopted, the connection member 30 and the first sub-plate 201a are ensured to be welded and fixed.

In an embodiment of the present application, as shown in fig. 1, the heat exchange plate 10 serves as a bottom plate of the box body, and the side plate 20 is disposed along a circumferential direction of the heat exchange plate 10, in this structure, the heat exchange plate 10 can play a role in packaging the battery model, can also play a role in saving an inner space of the battery box, and can also realize a role in heating or cooling the battery model.

In one embodiment of the present application, the heat exchange plate 10 is shaped as a rectangular portion and a trapezoidal portion connected to each other, wherein the lower base of the trapezoidal portion is the wide side of the rectangular portion. Correspondingly, the side plate 20 comprises a first sub-plate 201a arranged in the length direction of the rectangular portion of the heat exchanger plate 10, a second sub-plate 201b arranged in the width direction of the rectangular portion of the heat exchanger plate, a third sub-plate 201c arranged in the upper bottom edge of the trapezoidal portion of the heat exchanger plate 10, and a fourth sub-plate 201d arranged along the two oblique sides of the trapezoidal portion of the heat exchanger plate. The heat exchange plate 10 and the side plate 20 form an enclosed space for installing a battery module when the battery pack is assembled. Wherein, battery module includes a plurality of battery cells that set up side by side. And a cooling cavity is arranged in the heat exchange plate and is used for introducing a heat transfer medium so as to regulate the temperature of the battery pack. When fixing the battery module, the heat exchange plate may be provided with a mounting beam 101, and the battery module may be fixed by the mounting beam.

Referring to fig. 2, in an embodiment of the present application, the opening of the cavity of the heat exchange plate 10 is located at the long side of the rectangular portion thereof, and therefore, the connector 30 is provided between the first sub-plate 201a and the heat exchange plate 10 to seal off the heat exchange medium in the heat exchange plate. Fig. 3 is a schematic structural view of a connection member 30, a heat exchange plate 10 and a side plate 20 according to an embodiment of the present application, and fig. 4 is a schematic structural view of a welded portion after the connection member 30 is connected with the heat exchange plate 10 and the side plate 20 according to an embodiment of the present application. Referring to fig. 3 and 4 together, in an embodiment of the present application, a side of the connection member 30 facing the first side of the heat exchanger plate 10 is provided with a first protrusion 412, and the first protrusion 412 is inserted into the opening 411 of the cavity and is in fit connection with the opening 411 of the cavity. By adopting the first protruding part 41 to be matched and connected with the opening 411, the processing and assembling of the connecting member 30 and the heat exchange plate 10 can be facilitated. In addition, in the welding process, the welding head passes through the solid structure, so that the heat exchange plate can be prevented from deforming, and the welding quality is improved.

In an embodiment of the present application, as shown in fig. 4, referring to fig. 3 together with the direction from the connecting element 30 to the heat exchange plate 10, the protrusion size of the first protrusion 412 is greater than or equal to half of the width of the top weld between the connecting element 30 and the heat exchange plate 10, and greater than or equal to half of the width of the bottom weld between the connecting element 30 and the heat exchange plate 10. The protrusion size of the first protrusion 412 is d1, and the width of the top weld and the width of the bottom weld between the connector and the heat exchange plate are both d2, wherein d1 is equal to or greater than 1/2d 2. When the top and bottom bead widths are different, d1 is equal to or greater than half the larger bead width. By optimizing the relationship between the size of the first boss 412 and the width of the weld joint, the heat exchange plate can be effectively prevented from being deformed in the welding process of friction welding and the like.

In one embodiment, the distance between the first protrusion 412 and the wall surface of the opening 411 in the thickness direction of the heat exchange plate 30 is less than or equal to 0.5 mm. By controlling the difference in clearance between the first protruding portion 412 and the opening 411 within this range, the degree of fit between the first protruding portion 412 and the opening 411 can be improved, facilitating assembly.

With continued reference to fig. 5, when the connection member 30 is connected to the first sub-board 201a of the side plate 20, one of the first sub-board 201a and the connection member 30 is provided with a second protrusion 422, and the other is provided with a groove 421 matching with the second protrusion 422. Here, as an exemplary illustration, the second protrusion 422 is disposed on a side of the side plate 20 facing the connecting member 30, and the groove 421 is disposed on a side of the connecting member 30 facing the side plate 20. As another alternative, the second protrusion may be provided on a side of the connecting member facing the side plate, and the groove may be provided on a side of the side plate facing the connecting member.

In the thickness direction of the heat exchange plate, the distance between the second protruding part and the groove wall of the groove is less than or equal to 0.5 mm. Through with the poor control in this within range of clearance between second bellying and the recess, can improve the degree of cooperation between second bellying and the recess, convenient equipment.

Similarly, in an embodiment of the present application, the second protruding portion has a protruding dimension greater than half of the width of the weld between the connecting member and the side plate in the direction from the connecting member to the side plate.

Fig. 5 and 6 are schematic views illustrating a connection structure between the end of the connecting member and the heat exchange plate and the side plate, respectively, as shown in fig. 5, in an embodiment of the present application, a first notch 202 is respectively formed at two ends of the connecting member 30, wherein the opening direction of the first notch 202 may be toward the first sub-plate 201 a. As shown in fig. 6, in another embodiment of the present application, the opening direction of the first notch 202 may also be towards the heat exchange plate 10. In addition, in another embodiment of the present application, when two first notches 202 are disposed at either end of the connector, an opening direction of one of the first notches may face the first sub-plate 201a, and an opening direction of the other first notch 202 may face the heat exchange plate 10.

When the opening direction of first breach orientation curb plate, can make things convenient for between curb plate and the connecting piece to carry out the plug welding and handle, also be convenient for hold the welding seam height. When the opening direction of the first notch faces the heat exchange plate, the connecting piece can be further welded with the heat exchange plate in the thickness direction of the heat exchange plate through plug welding, so that the sealing reliability of the connecting piece and the heat exchange plate is improved, and meanwhile, the connecting piece is used for accommodating the height of a welding line and is also convenient to connect with other parts of the box body.

With continued reference to fig. 6, in an embodiment of the present application, a first notch 202 is provided towards the heat exchanger plate 10, and a second notch 203 is provided at a side of the heat exchanger plate 10 facing the connector 30. The openings of the first notch 202 and the second notch 203 are oppositely arranged to form a welding cavity, and in the welding cavity, the connecting member 30, the side plate 20 and the heat exchange plate 10 can be hermetically welded in the longitudinal direction (thickness direction of the heat exchange plate), so that leakage of a heat exchange medium is further avoided.

In an alternative embodiment of the present application, a second notch may be provided separately at the end of the heat exchanger plate, which second notch may face the connection piece. Through set up the second breach on the heat transfer board, carry out operations such as plug welding in the second breach, can further improve the reliability that the heat transfer board is vertically sealed.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. The utility model provides a battery box, its characterized in that includes box and heat transfer board, the box includes the curb plate, wherein:

the heat exchange plate is internally provided with a cavity for accommodating a heat exchange medium, and an opening of the cavity is positioned on the first side surface of the heat exchange plate;

the side plate comprises a first sub-plate arranged opposite to the first side face of the heat exchange plate;

a connecting piece is arranged between the first side surface of the heat exchange plate and the first sub-plate, and the connecting piece blocks the opening of the cavity;

and along the circumferential direction of the first side face, one side of the connecting piece facing the heat exchange plate and the first side face are welded to form a sealing frame, and the opening of the cavity is positioned in the enclosing area of the sealing frame.

2. The battery box according to claim 1, wherein a side of the connection member facing the first sub-board is fixedly connected to the first sub-board.

3. The battery box according to claim 1, wherein the heat exchange plate is a bottom plate of the box body, and the side plate is disposed along a circumferential direction of the heat exchange plate.

4. A battery box according to any of claims 1-3, characterized in that the side of the connecting piece facing the first side of the heat exchanger plate is provided with a first protruding part, which is inserted in an opening of the cavity.

5. The battery box of claim 4, wherein a projection dimension of the first projection is greater than or equal to half a width of a top weld between the connector and the heat exchange plate and greater than or equal to half a width of a bottom weld between the connector and the heat exchange plate in a direction from the connector to the heat exchange plate.

6. A battery box according to any of claims 1-3, wherein one of the first sub-board and the connecting member is provided with a second protrusion, and the other is provided with a groove for engaging with the second protrusion.

7. The battery box according to any one of claims 1 to 3, wherein at least one of the two ends of the connecting member is provided with a first notch facing the heat exchange plate and/or a first notch facing the side plate in a direction perpendicular to the arrangement direction of the heat exchange plate and the side plate and parallel to the plate surface of the heat exchange plate.

8. The battery box according to claim 7, wherein at least one of the two ends of the connecting member is provided with a second notch opposite to the first notch facing the heat exchange plate in a direction perpendicular to the arrangement direction of the heat exchange plate and the side plate and parallel to the plate surface of the heat exchange plate.

9. The battery box according to any one of claims 1 to 3, wherein a second notch is provided at least one of both ends of the heat exchange plate in a direction perpendicular to the arrangement direction of the heat exchange plate and the side plate and parallel to the plate surface of the heat exchange plate, the second notch facing the connector.