CN111276656B

CN111276656B - Battery pack lower box assembly integrated with efficient thermal management system

Info

Publication number: CN111276656B
Application number: CN202010099907.3A
Authority: CN
Inventors: 李日步; 高文龙; 吴东升; 吴天男; 周瑞华; 王海林
Original assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Jizhi New Energy Automobile Technology Co Ltd
Current assignee: Chongqing Ruilan Automobile Research Institute Co ltd; Zhejiang Geely Holding Group Co Ltd
Priority date: 2020-02-18
Filing date: 2020-02-18
Publication date: 2022-08-19
Anticipated expiration: 2040-02-18
Also published as: CN111276656A

Abstract

The invention provides a lower battery pack box assembly of an integrated efficient thermal management system, and belongs to the field of vehicle batteries. This box subassembly includes under battery package: the top surface of the module lower bottom plate is attached to the bottom surface of the battery cell in the battery module, and the bottom surface of the module lower bottom plate is provided with a plurality of grooves which are communicated along the preset direction; lower box bottom plate, its top surface be equipped with a plurality of first archs of a plurality of recess one-to-one joint, just a plurality of recesses with the coating has the heat-conducting glue between a plurality of first archs, lower box bottom plate still is formed with upper die cavity, heat transfer medium has been filled in the upper die cavity. The lower box body assembly of the battery pack simplifies the structure, improves the heat exchange efficiency and improves the internal accommodating space of the battery pack structure.

Description

Battery pack lower box assembly integrated with efficient thermal management system

Technical Field

The invention relates to the field of vehicle batteries, in particular to a battery pack lower box assembly of a vehicle integrated high-efficiency thermal management system.

Background

With the popularization of new energy electric vehicles, the problems of safety, service life and the like of the electric vehicles are gradually exposed. The battery needs to be charged and discharged within a proper temperature range for safe use and long service life cycle, and the optimal working temperature of the battery is 25-35 ℃. In order to achieve the temperature using condition, the power battery needs to be provided with a heat management system, an air cooling system and a water cooling system are generally used at present, the cooling efficiency of the air cooling system is low, and the utilization rate of the air cooling system is far lower than that of the water cooling system.

The general structure of water cooling system has two kinds, one kind is that the cooling water board is installed to module bottom plate below in the battery package, and the cooling water board weight is heavy, and structural strength is low, and it can not bear module weight, and if the water cooling board reveals in long-term the use moreover, then reveals back coolant and can arouse risks such as electric core short circuit in the box. In addition, the structure also needs a heat conducting pad, an elastic supporting piece and the like to be used together with the water cooling plate, and particularly, the elastic supporting piece has heavy weight and large volume, so that the arrangement space of the module is compressed, and the energy density of the battery system is reduced. Meanwhile, the scheme has more parts and tedious internal assembly process. The other scheme is that a cooling water plate is arranged outside the battery pack, the problem that the internal space and cooling liquid leak is solved, but the cooling efficiency is greatly reduced due to the fact that one more layer of battery bottom plate is used for blocking, and energy consumption is improved. Meanwhile, the bottom of the battery pack has a large bottom impact risk, and the cooling plate can be damaged.

Disclosure of Invention

An object of the present invention is to provide a battery pack lower case assembly of a vehicle integrated high-efficiency thermal management system, which simplifies the structure and improves the heat exchange efficiency.

Another object of the present invention is to increase the internal space of the battery pack structure.

In particular, the present invention provides a battery pack lower case assembly of an integrated high efficiency thermal management system, comprising:

the top surface of the module lower bottom plate is attached to the bottom surface of the battery core in the battery module, and the bottom surface of the module lower bottom plate is provided with a plurality of grooves which are communicated along the preset direction;

lower box bottom plate, its top surface be equipped with a plurality of first archs of a plurality of recess one-to-one joints, just a plurality of recesses with the coating has the heat-conducting glue between a plurality of first archs, lower box bottom plate still is formed with the upper die cavity, heat transfer medium has been filled in the upper die cavity.

Optionally, a plurality of second protrusions extending from the top surface to the bottom surface of the upper-layer cavity are further arranged in the upper-layer cavity.

Optionally, the lower case assembly of the battery pack further comprises:

and the shock absorption pad is arranged between the top surface of each first bulge and the bottom surface of each groove.

Optionally, a plurality of first reinforcing ribs connected with the top surface and the bottom surface of the upper-layer cavity are further arranged in the upper-layer cavity, and the first reinforcing ribs are arranged between the second protrusions in preset number at intervals.

Optionally, the upper cavity is arranged in the bottom plate of the lower box body and close to the top;

and a lower cavity is also arranged at a position close to the bottom of the lower box body bottom plate, and foaming heat-insulating glue is arranged in the lower cavity.

Optionally, a plurality of second reinforcing ribs connecting the top surface and the bottom surface of the lower-layer cavity are arranged in the lower-layer cavity.

Optionally, the lower case assembly of the battery pack further comprises:

the heat insulation plate is concave, is made of heat insulation materials, and at least covers the bottom surface of the bottom plate of the lower box body and two sides parallel to the through direction of the groove.

Optionally, the heat insulation plates positioned at two sides of the bottom plate of the lower box body extend to a preset height which is not lower than the top surface of the bottom plate of the module; and is

The lower box body component of the battery pack further comprises a heat insulation block which is arranged between the heat insulation plate and the lower bottom plate of the module.

Optionally, the lower case assembly of the battery pack further comprises:

the heat insulation plate is concave and made of heat insulation materials, and the upper layer cavity is formed by the heat insulation plates and the bottom surface of the bottom plate of the lower box body.

And the two sides of the heat insulation plate are attached to the two sides of the lower bottom plate of the module.

According to the invention, the upper-layer cavity is arranged in the bottom plate of the lower box body, heat exchange is carried out through a heat exchange medium in the upper-layer cavity, and meanwhile, the zigzag connecting structure (namely the first bulge and the groove) bonded through the heat-conducting glue is arranged between the lower bottom plate of the module and the bottom plate of the lower box body, so that the heat transmission of the lower bottom plate and the bottom plate of the lower box body is facilitated by the heat-conducting glue, and the zigzag combination effectively increases the heat exchange area, thereby greatly improving the heat exchange efficiency and reducing the risk of thermal runaway of the battery. The battery pack assembly is simple in structure, components such as a cooling plate, a heat conducting pad and an elastic support in the battery pack body are omitted, and the space in the battery pack assembly is greatly increased.

Furthermore, the cooling system is integrated at the bottom of the lower box body of the battery pack, so that the integration level is high, and the weight is greatly reduced.

Furthermore, heat exchange media in the cooling system can circulate in the bottom plate of the lower box body, and the structural strength of the cooling system is higher than that of a traditional thin-wall cold water plate.

Furthermore, the battery module can be directly installed in the lower bottom plate of the module, so that the supporting cross beams in the battery box can be eliminated or reduced, and the weight reduction purpose is achieved.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a schematic view illustrating the assembly of a lower case assembly and a battery module of a battery pack according to an embodiment of the present invention;

FIG. 2 is an enlarged view at A in FIG. 1;

fig. 3 is a sectional view of a lower case assembly and a battery module of a battery pack according to an embodiment of the present invention;

fig. 4 is a sectional view of a lower case assembly and a battery module of a battery pack according to another embodiment of the present invention;

fig. 5 is a sectional view of a lower case assembly of a battery pack and a battery module according to still another embodiment of the present invention.

Detailed Description

The battery pack assembly includes a cap plate, a lower case assembly, and a battery module 200. The cover body and the lower box body component which are covered form a closed cavity, and the closed cavity is used for placing the battery module 200. The lower box body component is in a box shape with an opening at the upper part. The invention is mainly redesigned for the bottom member of the lower box assembly.

Fig. 1 is a schematic view illustrating an assembly of a lower case assembly 100 of a battery pack and a battery module 200 according to an embodiment of the present invention. Fig. 2 is an enlarged view at a in fig. 1. Fig. 5 is a sectional view of the lower case assembly 100 of the battery pack and the battery module 200 according to still another embodiment of the present invention. The invention provides a battery pack lower case assembly 100 of an integrated high-efficiency thermal management system, and as shown in fig. 2, in one embodiment, the battery pack lower case assembly 100 comprises a module lower base plate 10 and a lower case base plate 20. The top surface of module lower plate 10 and the bottom surface laminating of the electric core in the battery module 200, the bottom surface of module lower plate 10 is equipped with a plurality of recesses 11 that link up along predetermineeing the direction. Lower box bottom plate 20 sets up in the below of module lower plate 10, and lower box bottom plate 20's top surface is equipped with a plurality of first archs 21 with a plurality of recesses 11 one-to-one joint, and the coating has the heat-conducting glue between a plurality of recesses 11 and a plurality of first archs 21, and lower box bottom plate 20 still forms and is equipped with upper mould cavity 22, has filled heat transfer medium, for example the coolant liquid of circulation in the upper mould cavity 22. As shown in fig. 2, the upper cavity 22 may be a cavity directly opened in the lower case bottom plate 20, or may be a cavity formed by the lower case bottom plate 20 having a fishbone shape in fig. 5 and other components (e.g., the heat insulation plate 40 in fig. 5).

This embodiment sets up upper mould chamber 22 in box bottom plate 20 down, heat transfer medium through in the upper mould chamber 22 carries out the heat transfer, simultaneously with setting up to adhesive zigzag connection structure (first arch 21 and recess 11 promptly) through the heat conduction between module lower plate 10 and the lower box bottom plate 20, the heat conduction is glued and is favorable to heat propagation between them, and zigzag's combination has effectively increased heat transfer area, consequently, heat exchange efficiency has been improved greatly, the battery thermal runaway risk has been reduced. And the structure of the embodiment is simple, components such as a cooling plate, a heat conducting pad and an elastic support in the battery pack body are eliminated, and the space in the battery pack assembly is greatly increased.

Further, this embodiment integrates cooling system in the bottom of the battery package lower box, and the integrated level is high and reduces the weight by a wide margin.

Further, the heat exchange medium in the cooling system can circulate in the bottom plate 20 of the lower box body, and the structural strength is higher than that of the traditional thin-wall water cooling plate.

Furthermore, the battery module 200 and the module lower base plate 10 can be directly installed above the lower case body base plate 20, so that the internal supporting beams of the battery case can be eliminated or reduced, and the supporting foam and other components can be eliminated, thereby achieving the purpose of reducing weight.

Fig. 3 is a sectional view of the lower case assembly 100 of the battery pack and the battery module 200 according to one embodiment of the present invention. In another embodiment, as shown in fig. 3, a plurality of second protrusions 23 are further provided in the upper cavity 22 to protrude from the top surface to the bottom surface of the upper cavity 22.

The high-efficiency heat exchange process comprises the following steps: the heat transfer medium obtains the heat through outside Chiller (heat exchanger) and fully flows in upper die cavity 22 through outside water pump, and its and the abundant heat exchange back of second arch 23, heat conduction to first arch 21, first arch 21 is through with module lower plate 10's recess 11 direct contact or the indirect contact of heat-conducting glue with the heat conduction back with the heat conduction to module lower plate 10, module lower plate 10 continues to conduct the heat to electric core in the battery module 200, reaches high-efficient thermal management.

This embodiment is through setting up a plurality of second archs 23 that stretch out in upper die cavity 22, can increase the heat transfer area of box bottom plate 20 and heat transfer medium down, has further improved heat exchange efficiency.

Alternatively, as shown in fig. 3, each first protrusion 21 is aligned one-to-one with each second protrusion 23, so that heat from between the first protrusion 21 and the second protrusion 23 can be conducted to each other more quickly.

In one embodiment, as shown in fig. 3, the thermal conductive paste extends all the way to the edge 12 of the module bottom plate 10, thereby completely eliminating the air layer and ensuring complete heat exchange.

In another embodiment, the lower case assembly 100 of the battery pack further includes a shock-absorbing pad 30 disposed between the top surface of each first protrusion 21 and the bottom surface of each groove 11, which can prevent the battery module 200 from vibrating during the driving process.

As shown in fig. 3, in one embodiment, a plurality of first ribs 24 are further disposed in the upper cavity 22 to connect the top surface and the bottom surface thereof, and the plurality of first ribs 24 are spaced between a predetermined number of second protrusions 23. The first reinforcing bead 24 can be understood as: every nth second protrusion 23 is configured to connect the top surface and the bottom surface of the upper cavity 22, and N may be an integer of 10, 12, etc. The first reinforcing rib 24 is provided to improve the strength of the lower case bottom plate 20.

In another embodiment, as shown in fig. 3, the upper cavity 22 is disposed in the lower box bottom plate 20 near the top, and the lower cavity 25 is disposed in the lower box bottom plate 20 near the bottom, and has a foaming thermal insulation glue therein.

This embodiment has the thermal-insulated gluey lower floor die cavity 25 of foaming through setting up the packing, and thermal-insulated foaming glue can play the thermal-insulated effect that keeps warm on the one hand, and box bottom plate 20 takes place heat exchange with the external world under the reduction of certain degree, improves thermal management efficiency. On the other hand, the lower cavity 25 filled with the foamed heat insulating paste can increase the strength of the lower case bottom plate 20, and can resist the impact of foreign objects at the bottom while the battery module 200 is supported by the lower cavity.

In another embodiment, as shown in fig. 3, a plurality of second ribs 26 are provided in the lower cavity 25 to connect the top and bottom surfaces thereof. The second reinforcing rib 26 divides the lower cavity 25 into a plurality of small cavities, and the second reinforcing rib 26 can improve the strength of the lower bottom plate of the box body.

Alternatively, the first and

second ribs

24, 26 are aligned so that when force is transmitted up and down, the force is transmitted in a straight line, providing better support.

Fig. 4 is a sectional view of the lower case assembly 100 of the battery pack and the battery module 200 according to another embodiment of the present invention. As shown in fig. 4, in one embodiment, the lower case assembly 100 of the battery pack further includes a heat insulating plate 40 having a concave shape, made of a heat insulating material, covering at least the bottom surface of the lower case bottom plate 20 and both sides parallel to the penetrating direction of the groove 11. It should be noted that in the present embodiment, the lower cavity 25 filled with the foaming thermal insulation glue is replaced by the thermal insulation board 40, so as to perform a similar thermal insulation function.

The heat shield 40 may be attached to the lower housing floor 20 by glue, screws, or welding. The arrangement of the heat insulation plate 40 can better prevent heat exchange between a heat exchange medium and an external connecting object or external air, reduce the energy consumption of the battery heat management system and improve the endurance mileage.

In another embodiment, as shown in fig. 4, the insulation panels 40 positioned at both sides of the lower case bottom 20 are extended to a predetermined height not lower than the top surface of the module lower bottom 10. And the battery pack lower case assembly 100 further includes a heat insulation block 50 disposed between the heat insulation plate 40 and the module lower base plate 10.

This embodiment is suitable for the case when there is a gap between the insulation board 40 and both sides of the module lower panel 10. The heat insulation blocks 50 are arranged between the two sides of the lower box bottom plate 20 and the heat insulation plate 40, so that the lower box bottom plate 20 is also sufficiently insulated, heat exchange with the outside is blocked, and the heat insulation effect is achieved.

As shown in fig. 5, in one embodiment, the lower case assembly 100 of the battery pack further includes a heat insulation plate 40 having a concave shape, made of a heat insulation material, and forming an upper cavity 22 with the bottom surface of the lower case bottom plate 20.

That is to say, the upper-layer cavity 22 in this embodiment is not a cavity directly opened in the lower box bottom plate 20, but the bottom of the lower box bottom plate 20 is wrapped by the heat insulation plate 40, and then the upper-layer cavity 22 is formed together with the lower box bottom plate 20, and both sides of the top and the bottom of the lower box bottom plate 20 at this time are provided with the saw-tooth structures. The bottom plate 20 of the lower box body of the embodiment can play the roles of heat exchange and heat insulation as well as the heat insulation plate 40.

Further, a first rib 24 may be similarly provided in the upper cavity 22 formed by the lower case bottom plate 20 and the heat insulation plate 40, and the first rib 24 may protrude from the bottom of the lower case bottom plate 20 and abut against the heat insulation plate 40. The lower case bottom 20 is coupled to the heat insulating panel 40 by various means such as screwing, welding or riveting at the first reinforcing beads 24.

It should be noted that if the strength of the insulation board 40 with the predetermined size is not enough to satisfy the strength requirement, the insulation board 40 may be made of a metal material with higher strength. Meanwhile, heat insulation glue is sprayed or a heat insulation pad is installed on the inner side of the heat insulation plate 40, so that heat exchange between the bottom plate 20 of the lower box body and the outside is further prevented, the self weight is greatly reduced, the efficiency of a heat management system is improved, and the energy density of the battery pack is improved.

As shown in fig. 5, in one embodiment, the heat insulation plates 40 positioned at both sides of the lower case bottom 20 extend to a predetermined height not lower than the top surface of the module lower bottom 10, and both sides of the heat insulation plates 40 are attached to both sides of the module lower bottom 10. So that the insulation board 40 can insulate the module lower panel 10 at the same time.

When there is a size difference between the module lower bottom plate 10 and the lower box bottom plate 20, which results in a gap between the heat insulation plate 40 and the module lower bottom plate 10, a heat insulation block 50 may be disposed at the gap, so as to insulate heat in all directions, thereby achieving a good heat insulation effect.

In the embodiment of the present invention shown in fig. 3, the lower case bottom plate 20 may be integrally cast or formed in one step by extrusion or the like, thereby simplifying the assembly process. Or the embodiment shown in fig. 4 or 5 only requires one more welding or other joining process (installation of the insulation panel 40), the assembly process can be greatly simplified. Compared with the existing battery cooling system, the battery cooling system has the advantages that the number of parts is reduced, the internal supporting beams are eliminated or reduced, so that the weight can be greatly reduced, and the energy density is improved. And whole structural strength is high, has eliminated the coolant liquid and has revealed the safety risk that arouses in box inner space.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims

1. A battery pack bottom case assembly for an integrated high efficiency thermal management system, comprising:

the top surface of the module lower bottom plate is attached to the bottom surface of the battery cell in the battery module, and the bottom surface of the module lower bottom plate is provided with a plurality of grooves which are communicated along the preset direction;

the top surface of the lower box body bottom plate is provided with a plurality of first bulges which are correspondingly clamped with the plurality of grooves one by one, heat-conducting glue is coated between the plurality of grooves and the plurality of first bulges, an upper-layer cavity is formed in the lower box body bottom plate, and a heat exchange medium is filled in the upper-layer cavity;

a plurality of second bulges extending from the top surface to the bottom surface of the upper-layer cavity are also arranged in the upper-layer cavity;

the first protrusions and the second protrusions are aligned one by one;

the heat insulation plate is concave, is made of heat insulation materials, and at least covers the bottom surface of the bottom plate of the lower box body and two sides parallel to the through direction of the groove;

the heat insulation plates positioned on two sides of the bottom plate of the lower box body extend to a preset height which is not lower than the top surface of the lower bottom plate of the module; and the lower box body component of the battery pack further comprises a heat insulation block which is arranged between the heat insulation plate and the lower bottom plate of the module.

2. The battery pack lower case assembly of claim 1, further comprising:

3. The battery pack lower case assembly of claim 1,

still be equipped with a plurality of first strengthening ribs of connecting its top surface and bottom surface in the upper die cavity, it is a plurality of first strengthening rib interval arrangement is in predetermineeing quantity between the second arch.

4. The battery pack lower case assembly according to any one of claims 1 to 3,

the upper-layer cavity is arranged in the bottom plate of the lower box body and is close to the top;

and a lower cavity is also arranged at a position close to the bottom of the lower box body bottom plate, and foaming heat-insulating glue is arranged inside the lower cavity.

5. The battery pack lower case assembly of claim 4,

and a plurality of second reinforcing ribs for connecting the top surface and the bottom surface of the lower-layer cavity are arranged in the lower-layer cavity.

6. The battery pack lower case assembly of any one of claims 1-3, further comprising:

7. The battery pack lower case assembly of claim 6,

the heat insulation plates positioned on two sides of the bottom plate of the lower box body extend to a preset height which is not lower than the top surface of the lower bottom plate of the module; and is