CN217589122U

CN217589122U - Battery pack and vehicle

Info

Publication number: CN217589122U
Application number: CN202221424461.8U
Authority: CN
Inventors: 林成金; 杨政杰; 刘安龙; 李飞鸿; 程辉; 林艺垚; 李恒
Original assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Current assignee: Guangzhou Xiaopeng Motors Technology Co Ltd
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2022-10-14
Anticipated expiration: 2032-06-08

Abstract

The present application relates to a battery pack and a vehicle. The battery pack comprises a box body, a battery module arranged in the box body and a liquid cooling plate connected with the battery module; the liquid cooling plate is arranged at the bottom of the battery module and is in contact with the battery module, the box body is formed by combining a plurality of frame bodies, at least part of the bottom of each frame body is provided with a connecting structure, each connecting structure is provided with a first connecting portion and a second connecting portion, the first connecting portions are connected with the battery module, and the second connecting portions are connected with the liquid cooling plate. The scheme provided by the application can simplify the assembly process of the battery pack and improve the production efficiency of the battery pack.

Description

Battery pack and vehicle

Technical Field

The application relates to the technical field of batteries, in particular to a battery pack and a vehicle.

Background

Along with the popularization of automobile electromotion, people have higher and higher requirements on light weight, high grouping, low cost and long endurance of battery products, and the battery pack box body is more and more concerned by people in integration and light weight design as an important part of automobile electromotion.

In the correlation technique, the integrated efficiency of battery package box, electric core and liquid cooling board is lower, and the battery package box generally adopts modes such as welding, bolted connection with being connected of liquid cooling board, and technology is comparatively complicated, leads to low in production efficiency, and is with high costs.

SUMMERY OF THE UTILITY MODEL

In order to solve or partially solve the problems in the related art, the battery pack and the vehicle are provided, the assembly process of the battery pack can be simplified, and the production efficiency of the battery pack is improved.

A first aspect of the present application provides a battery pack, including:

the battery box comprises a box body, a battery module arranged in the box body and a liquid cooling plate connected with the battery module;

the liquid cooling plate is arranged at the bottom of the battery module and is in contact with the battery module, the box body is formed by combining a plurality of frame bodies, at least part of the bottom of each frame body is provided with a connecting structure, each connecting structure is provided with a first connecting portion and a second connecting portion, the first connecting portions are connected with the battery module, and the second connecting portions are connected with the liquid cooling plate.

In one embodiment, the battery module is formed by combining a plurality of sheet-shaped battery cells, and the connection structures are at least arranged on the frame body along two sides of the length direction of the sheet-shaped battery cells.

In one embodiment, the first connecting part and the battery module are bonded by structural adhesive; and/or the presence of a gas in the gas,

the second connecting part and the liquid cooling plate are bonded through structural adhesive.

In one embodiment, the connection structure includes a connection edge extending from the frame toward one side of the battery module, the first connection portion is formed on an upper surface of the connection edge, and the second connection portion is disposed near an edge of the connection edge.

In one embodiment, the second connecting portion are including locating the connection limit is close to the heavy platform in the inboard edge of box, heavy platform be equipped with be used for with liquid cold plate is along horizontal looks butt's lateral wall to and be equipped with be used for with liquid cold plate is along the diapire of vertical phase connection.

In one embodiment, the upper side of the bottom wall of the sinking platform is provided with a glue groove which is arranged opposite to the liquid cooling plate, and the space defined by the glue groove and the liquid cooling plate is used for filling structural glue.

In one embodiment, the frame body comprises an inner wall, the plane where the inner wall is located is along the height direction of the box body, the connecting edge extends out from the bottom of the inner wall along the transverse direction, a reinforcing rib is connected between the connecting edge and the inner wall, and the reinforcing rib is arranged in an inclined mode relative to the connecting edge.

In one embodiment, the liquid cooling plate comprises an upper plate and a lower plate which are connected into a whole, the upper plate is provided with a plane attached to the battery module, and the lower plate is provided with a concave-convex structure used for forming a liquid cooling flow channel; the plane of the upper plate and the upper surface of the connecting edge are in the same plane.

In one embodiment, a reinforcing plate is attached to the upper portion of the battery module, and the reinforcing plate is bonded with the battery module through structural adhesive.

A second aspect of the present application provides a vehicle, characterized by comprising the battery pack as described above.

The technical scheme provided by the application can comprise the following beneficial effects:

the battery pack comprises a box body, a battery module arranged in the box body and a liquid cooling plate connected with the battery module; the liquid cooling plate is arranged at the bottom of the battery module and is in contact with the battery module, the box body is formed by combining a plurality of frame bodies, the bottom of at least part of the frame bodies is provided with a connecting structure extending towards one side of the battery module, the connecting structure is provided with a first connecting portion and a second connecting portion, the first connecting portion is connected with the battery module, and the second connecting portion is connected with the liquid cooling plate. The first connecting portion can bond through the structure glue between with battery module, can bond through the structure glue between second connecting portion and the liquid cooling board, consequently can glue liquid cooling board, battery module, box three through the structure and bond as an organic wholely, has avoided adopting connection methods such as welding, bolt to cause the defect that technology is complicated among the correlation technique, is favorable to improving battery package's production efficiency, the cost is reduced.

Further, the connection structure includes a connection edge extending from the frame toward one side of the battery module, the first connection portion is formed on an upper surface of the connection edge, and the second connection portion is disposed near an edge of the connection edge. The structure ensures that the liquid cooling plate can be more stably arranged at the bottom of the box body; in addition, the heavy platform of liquid cooling board can provide support load to the liquid cooling board, on the atress ability of guaranteeing the liquid cooling board can effectively transmit the frame for the overall structure of battery package is more stable.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.

Fig. 1 is an exploded view of a battery shown in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a case of a battery pack according to an embodiment of the present application;

fig. 3 is a cross-sectional view of a frame of a battery pack according to an embodiment of the present application;

FIG. 4 isbase:Sub>A cross-sectional view taken at A-A in FIG. 2;

FIG. 5 is an enlarged view of a portion of FIG. 4 at E;

FIG. 6 is an enlarged view of a portion of FIG. 4 at F;

fig. 7 is a schematic structural view of a case of a battery pack according to another embodiment of the present application.

Reference numerals are as follows: 1. a reinforcing plate; 2. a battery module; 3. a liquid-cooled plate; 31. an upper plate; 32. a lower plate; 4. a box body; 42. a frame body; 44. a stringer; 45. a cross beam; 46. an accommodating space; 421. a connecting edge; 422. a lower surface; 423. an upper surface; 423. sinking a platform; 424. a glue groove; 425. reinforcing ribs; 426. an inner wall; 4221. and connecting the materials.

Detailed Description

Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While embodiments of the present application are illustrated in the accompanying drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present application.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integers; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the correlation technique, the integrated efficiency of battery package box, electric core and liquid cooling board is lower, and wherein the battery package box is connected modes such as welding, bolted connection with liquid cooling board, and technology is comparatively complicated, leads to low in production efficiency, and is with high costs. In view of the above problems, the embodiment of the application provides a battery pack, which simplifies the assembly process of the battery pack and improves the production efficiency of the battery pack.

The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Fig. 1 is an exploded view of a battery shown in an embodiment of the present application; fig. 3 is a sectional view of a frame body of a battery pack according to an embodiment of the present application.

Referring to fig. 1 and 3, the battery pack according to the embodiment of the present application includes a case 4, a battery module 2 mounted in the case 4, and a liquid cooling plate 3 connected to the battery module 2; wherein, liquid cooling plate 3 locates battery module 2's bottom, and contacts with battery module 2, and box 4 is formed by a plurality of framework 42 combinations, and at least part of framework 42's bottom is equipped with the connection structure who extends towards battery module 2 one side, and connection structure is equipped with first connecting portion and second connecting portion, and first connecting portion and battery module 2 link to each other, and second connecting portion and liquid cooling plate 3 link to each other.

According to the scheme of the embodiment of the application, the first connecting portion and the battery module 2 can be bonded through the structural adhesive, the second connecting portion and the liquid cooling plate 3 can be bonded through the structural adhesive, the liquid cooling plate 3, the battery module 2 and the box body 4 can be bonded into a whole through the structural adhesive, the defect that the process is complex due to the fact that connecting modes such as welding and bolts are adopted in the related technology is avoided, the production efficiency of a battery pack is favorably improved, and the cost is reduced.

In this embodiment, the battery module 2 is formed by combining a plurality of stacked sheet-shaped battery cells, the reinforcing plate 1 is arranged above the battery module 2, and the reinforcing plate 1 and the battery module 2 are bonded through structural adhesive. Therefore, the combination between the battery cores is more stable, and the installation stability of the battery module 2 can be improved.

The sheet-like cells may be blade cells, which are called blade cells because of their long, thin shape, similar to a blade. Consequently, battery module 2 of this application adopts blade electricity core can improve the volume utilization of box 4, and more quantity of electricity cores can be packed into to box 4 of the same size, has higher energy density.

In this embodiment, the battery pack includes an upper case 4 (not shown) and a lower case 4, where the case 4 is the lower case 4 in this embodiment, the case 4 is formed by combining four frames, and the space region defined by the four frames is used for installing the battery module 2.

In this embodiment, the frame 42 may be a frame along both sides of the length direction X of the sheet-shaped battery cell, and the plate, that is, the connection structure, is at least provided on the frame 42 along both sides of the length direction X of the sheet-shaped battery cell. The frames 23 on both sides in the stacking direction Y of the sheet-shaped battery cell are ends, and the high-voltage extraction poles of the battery module 2 are located on both sides in the length direction X of the sheet-shaped battery cell.

FIG. 4 isbase:Sub>A cross-sectional view taken at A-A of FIG. 2; FIG. 5 is a partial enlarged view at E in FIG. 4; fig. 6 is a partially enlarged view at F in fig. 4.

Referring to fig. 4, 5, and 6, in the present embodiment, the connection structure includes a connection edge 421 extending from the frame 42 toward the battery module 2, the first connection portion is formed on an upper surface 423 of the connection edge 421, and the second connection portion is disposed near an edge of the connection edge 421. The connecting edge 421 is also called "pocket edge", and "pocket edge" extends to the interior of the box 4 by a wide margin, can support the side of the liquid cooling plate 3, and realizes the function of supporting the bottom of the liquid cooling plate 3.

The liquid cooling plate 3 is formed of a double plate including an upper plate and a lower plate fixed as one body, and the upper plate may have a thickness greater than that of the lower plate. The upper plate is provided with a plane attached to the battery module 2, and the lower plate is provided with a concave-convex structure for forming a liquid cooling flow passage.

In some embodiments, the plane of the upper plate of the liquid cooling plate 3 is coated with a heat conducting structural adhesive, and the battery module 2 is fixed to the liquid cooling plate 3 through the heat conducting structural adhesive. The liquid cooling plate 3 is provided with a liquid inlet and a liquid outlet which are communicated with the liquid cooling flow channel, and the liquid inlet and the liquid outlet are used for being connected with the liquid cooling circulating system after liquid is fed, so that liquid cooling heat dissipation of the battery module 2 is realized.

In this embodiment, the plane of the upper plate is flush with the upper surface 423 of the connecting edge 421 near the frame 42. After battery module 2 put into box 4, battery module 2's bottom can contact in first connecting portion, can contact in liquid cooling board 3 again, and then can glue through the structure and connect the three into overall structure.

In this embodiment, the frame 42 has an inner wall 426, the connecting edge 421 extends from the bottom of the inner wall 426 to the inner side of the box 4, and the connecting edge 421 has a preset extending length, which may be greater than 50mm, for example, between 50mm and 100 mm. After the battery module 2 is assembled in the box 4, a gap with a preset width dimension is formed between the inner wall 426 of the frame 42 and the battery module 2, and the gap can provide an installation space for a bus bar of a battery cell and a routing space for a sampling harness of the battery cell. In addition, when the vehicle produces the side post and bumps, this clearance can cushion the deformation that framework 42 received external force extrusion to produce, and then avoids damaging the positive negative pole part of inside electric core, has promoted the security of battery package.

With continued reference to fig. 3 and 5, in the present embodiment, the second connecting portion of the connecting edge 421 includes a sinking platform 423 disposed at the connecting edge 421 near the inner side edge of the box body 4, and the sinking platform 423 is provided with a side wall for laterally abutting against the liquid cooling plate 3, and a bottom wall for longitudinally connecting with the liquid cooling plate 3. The side part of the liquid cooling plate 3 can be embedded into the sinking platform 423, so that the upper surface 423 of the liquid cooling plate 3 and the upper surface 423 of the connecting edge 421 are in the same plane, and meanwhile, the vertical side edge of the liquid cooling plate 3 can be abutted against the side wall, so that the liquid cooling plate 3 can be limited in the transverse direction and the longitudinal direction, and the liquid cooling plate 3 can be more stably installed at the bottom of the box body 4; in addition, heavy platform 423 can provide support load to liquid cooling plate 3, ensures that the atress of liquid cooling plate 3 can effectively transmit on the frame for the overall structure of battery package is more stable.

In some embodiments, the upper side of the bottom wall of the sinking stage 423 is provided with a glue groove 424 opposite to the liquid cooling plate 3, a space defined by the glue groove 424 and the liquid cooling plate 3 is used for filling structural glue, when the side edge of the liquid cooling plate 3 is supported on the sinking stage 423, the lower surface 422 of the liquid cooling plate 3 covers the opening of the glue groove 424, and then a space for filling structural glue is defined by the glue groove 424, the structural glue can be polyurethane, for example, and the structural glue can play a role in structural connection and sealing between the connecting edge 421 and the liquid cooling plate 3.

The glue groove 424 may be disposed along an extending direction perpendicular to the connecting edge 421, the glue groove 424 is recessed downward and is substantially "concave", and in some embodiments, the glue groove 424 is disposed to have a predetermined width and depth dimension, for example, the glue groove 424 may have a width of 5mm and a depth of 0.2-0.5mm. Therefore, the bonding strength between the liquid cooling plate 3 and the frame of the box body 4 can be controlled.

In this embodiment, since the connecting edge 421 is connected to the liquid cooling plate 3 by using the structural adhesive, the defect of complicated processes of welding connection, FDS (FlowDri 11 screen) connection, and bolting in the related art is overcome, the connection structure is simplified, and the connection strength and the sealing property are better.

In some embodiments, the frame 42 includes an inner wall 426, the plane of the inner wall 426 is along the height direction Z of the box 4, the connecting edge 421 extends from the bottom of the inner wall 426 in the transverse direction, and the cross section of the frame 42 and the connecting edge 421 may be "L" shaped, but is not limited thereto.

In one implementation, the frame 42 and the connecting edge 421 can be integrally formed. A reinforcing rib 425 is connected between the connecting edge 421 and the inner wall 426, and the reinforcing rib 425 is disposed to be inclined with respect to the connecting edge 421 and is located at one side of the battery module 2.

With continued reference to fig. 3, in one implementation, the frame body 42 is made of a section bar with a hollow structure, the thickness of the section bar may be 3-6mm, and the thickness of the reinforcing rib 425 may be 1-3mm, and after such dimensions are set, when the extension dimension of the connecting edge 421 is too long, the problem of too large local stress caused by too long extension can be effectively solved.

In this embodiment, the lower surface 422 of connection limit 421 is a part of the bottom surface of box 4, the at least partial region subsides of the upper surface 423 of connection limit 421 are equipped with connecting material 4221, connecting material 4221 can be PET (Polyethylene terephthalate) membrane, the PET membrane can adopt hot pressing or gluing mode to laminate mutually with the upper surface 423 of connection limit 421, simultaneously, the structure of coating superhigh intensity glues on the PTT membrane, the structure is glued and is used for bonding mutually with the battery module 2 of top, and then realize being connected of battery module 2 and box 4.

Referring to fig. 2, in some embodiments, a transverse beam 45 and a longitudinal beam 44 are arranged inside the box 4, the transverse beam is arranged along a direction X, the longitudinal beam is arranged along a direction Y, the sheet-shaped battery cells are arranged along an extending direction Y perpendicular to the longitudinal beam 44, the transverse beam 45 and the longitudinal beam 44 divide the inner space of the box 4 into a plurality of subspaces, and the liquid cooling plate 3 and the battery module 2 are installed in each subspace. The cross beam 45 and/or the longitudinal beam 44 may be provided with the above-mentioned connecting edge 421 on one side close to the battery module 2, the bottom of the battery module 2 and one side of the liquid cooling plate 3 are supported on the connecting edge 421 of the frame, and the other side is supported on the connecting edge 421 of the longitudinal beam 44.

Referring to fig. 7, in some embodiments, in order to increase the length of the battery cell, the longitudinal beam 44 may not be disposed in the box 4, the side beams on the left and right sides and/or the upper and lower sides of the box 4 are provided with the above-mentioned connecting edges 421, and both sides of the bottom of the battery module 2 are respectively supported on the connecting edges 421 on both sides. The structure can be further simplified like this for battery module 2 still bears through the connection limit 421 of framework 42, has further improved battery package energy density and product integration, reduces material cost, can satisfy the high price/performance ratio and the lightweight requirement of electric motor car.

The battery pack provided by the embodiment of the application is introduced above, and correspondingly, the application also provides a vehicle comprising the battery pack of the embodiment.

The battery pack of the vehicle comprises a box body 4, a battery module 2 arranged in the box body 4 and a liquid cooling plate 3 connected with the battery module 2; wherein, liquid cooling plate 3 locates the bottom of battery module 2, and contacts with battery module 2, and box 4 is formed by a plurality of framework 42 combinations, and at least part of the bottom of framework 42 is equipped with the connection structure who extends towards battery module 2 one side, and connection structure is equipped with first connecting portion and second connecting portion, and first connecting portion and battery module 2 link to each other, and second connecting portion and liquid cooling plate 3 link to each other.

The foregoing description of the embodiments of the present application has been presented for purposes of illustration and description and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or improvements to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A battery pack, comprising:

2. The battery pack according to claim 1, wherein:

the battery module is formed by combining a plurality of sheet-shaped battery cells, and the connecting structures are at least arranged on the frame bodies along the two sides of the length direction of the sheet-shaped battery cells.

3. The battery pack according to claim 1, wherein:

the first connecting part and the battery module are bonded through structural adhesive; and/or the presence of a gas in the atmosphere,

the second connecting part is bonded with the liquid cooling plate through structural adhesive.

4. The battery pack according to claim 1, wherein:

the connecting structure comprises a connecting edge extending from the frame body towards one side of the battery module, a first connecting part is formed on the upper surface of the connecting edge, and a second connecting part is close to the edge of the connecting edge.

5. The battery pack according to claim 4, wherein:

the second connecting portion are including locating the connection limit is close to the heavy platform in the inboard edge of box, heavy platform be equipped with be used for with liquid cooling board is along the lateral wall of horizontal looks butt, and be equipped with be used for with the diapire that liquid cooling board vertically is connected.

6. The battery pack according to claim 5, wherein:

the upper side of the bottom wall of the sinking platform is provided with a glue groove opposite to the liquid cooling plate, and the space defined by the glue groove and the liquid cooling plate is used for filling structural glue.

7. The battery pack according to claim 4, wherein:

the frame body comprises an inner wall, the plane where the inner wall is located is along the height direction of the box body, the connecting edge extends from the bottom of the inner wall along the transverse direction, a reinforcing rib is connected between the connecting edge and the inner wall, and the reinforcing rib is arranged in an inclined mode relative to the connecting edge.

8. The battery pack according to claim 4, wherein:

the liquid cooling plate comprises an upper plate and a lower plate which are connected into a whole, the upper plate is provided with a plane which is attached to the battery module, and the lower plate is provided with a concave-convex structure which is used for forming a liquid cooling runner; the plane of the upper plate and the upper surface of the connecting edge are in the same plane.

9. The battery pack according to claim 1, wherein:

the battery module is characterized in that a reinforcing plate is arranged above the battery module in an attached mode, and the reinforcing plate is bonded with the battery module through structural adhesive.

10. A vehicle characterized by comprising the battery pack according to any one of claims 1 to 9.