CN215008372U

CN215008372U - Battery shell structure and battery pack

Info

Publication number: CN215008372U
Application number: CN202120791424.XU
Authority: CN
Inventors: 李凯
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-04-16
Filing date: 2021-04-16
Publication date: 2021-12-03
Anticipated expiration: 2031-04-16

Abstract

The utility model relates to a lithium cell technical field provides a battery shell plate structure and battery package. Battery shell structure, including first plywood, second plywood and two sets of relative curb plates, first plywood the second plywood with the cavity is enclosed into to the curb plate, be provided with additional strengthening in the cavity, the outside of first plywood is provided with heat radiation structure, be provided with a plurality of vents on the curb plate, in order to be in form the ventilation flue in the cavity. Battery package, be provided with battery module and above-mentioned battery shell structure, the battery module is located the second plywood dorsad one side of first plywood. The utility model provides a battery shell structure can strengthen the heat transfer effect of coverboard, improves the cooling efficiency to the battery package.

Description

Battery shell structure and battery pack

Technical Field

The utility model relates to a lithium cell technical field especially, relates to a battery shell structure. Furthermore, the utility model discloses still relate to a battery package including this battery shell structure.

Background

The lithium battery has wide application in work and life, and the lithium battery has good electricity storage performance and discharge performance, so the lithium battery is popular with most people. With the rapid development of lithium battery technology, the requirements of new energy application fields such as electric vehicles and the like on lithium batteries are higher and higher, and the capacity and the power of the lithium batteries are also higher and higher.

Although the user acceptance degree of electric automobile products is greatly improved after a period of development, the endurance mileage and the service life of the lithium battery always restrict the development of the electric automobiles compared with the traditional fuel oil vehicles. The lithium battery has larger heat productivity in the working state, and the heat is dissipated in time, so that the internal temperature of the lithium battery is increased, and finally the lithium battery is deformed, the charging and discharging quality of the lithium battery is influenced, and even explosion is caused. Therefore, the lithium battery of the electric vehicle needs to be ensured to be at a proper temperature to ensure the output of power and prolong the service life.

The high temperature cooling of present lithium cell mainly has natural cooling, liquid cooling and forced air cooling three kinds of modes, wherein, the module of lithium cell all directly pastes under when adopting natural cooling on the casing, main heat-transfer face is the casing down during high temperature, nevertheless the casing is in order to subtract heavy and intensity all can set up to bilayer structure down when the design, the outside air can only carry out the heat transfer with the aluminum plate of casing outside one deck down, and can't carry out the heat transfer with inboard aluminum plate of casing and module down, the air of casing bilayer structure inner chamber still can have certain heat preservation effect down, all can lead to the radiating effect of lithium cell relatively poor.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a battery shell structure to can strengthen the heat transfer effect of shell plate, improve the cooling efficiency to the battery package.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a battery shell structure comprises a first laminate, a second laminate and two sets of opposite side plates, wherein a hollow cavity is defined by the first laminate, the second laminate and the side plates, a reinforcing structure is arranged in the hollow cavity, a heat dissipation structure is arranged on the outer side of the first laminate, and a plurality of ventilation openings are formed in the side plates so as to form ventilation air channels in the hollow cavity.

Furthermore, the reinforcing structure comprises a plurality of reinforcing ribs located in the hollow cavity, the upper end and the lower end of each reinforcing rib are respectively connected with the first laminate and the second laminate, and the reinforcing ribs are matched with the ventilation openings to form the ventilation air ducts.

Furthermore, two ends of the reinforcing rib along the length direction of the reinforcing rib are connected with a group of side plates located in the length direction of the hollow cavity.

Furthermore, a plurality of strengthening ribs are arranged in parallel, a ventilation gap is formed between every two adjacent strengthening ribs, and at least one ventilation gap is arranged at two ends of the ventilation gap, so that the ventilation gap is communicated with the corresponding ventilation gap to form the ventilation air channel.

Furthermore, the heat dissipation structure comprises a plurality of heat dissipation fins connected with the first layer plate, and the heat dissipation fins are arranged on one side, back to the second layer plate, of the first layer plate.

Furthermore, a plurality of radiating fins are arranged in parallel and are uniformly distributed on the first laminate.

Furthermore, the radiating fins extend along the length direction of the hollow cavity and are perpendicular to the first layer plate.

Further, the second laminate is a metal flat plate.

Furthermore, at least one group of opposite side plates is provided with a shell plate connecting part.

Compared with the prior art, battery shell structure have following advantage:

(1) the battery shell structure of the utility model is provided with a plurality of ventilation openings on the side plate of the hollow cavity, so as to form a ventilation air channel in the hollow cavity, so that the air in the hollow cavity is in a flowing state, and meanwhile, the cold air in the ventilation air channel can directly contact with the second laminate for heat exchange, thereby not only increasing the heat exchange area for radiating the battery shell structure, but also effectively avoiding the air heat preservation effect in the hollow cavity, and further improving the cooling efficiency of the whole lithium battery; the outside of first plywood is provided with heat radiation structure, can further increase the heat transfer area of cold air and battery shell plate structure, and the heat transfer effect of reinforcing shell plate avoids the inside high temperature of lithium cell.

(2) In the battery shell structure of the present invention, ventilation gaps are formed between adjacent reinforcing ribs, and the two ends of at least one ventilation gap are provided with ventilation openings, so that the ventilation openings and the corresponding ventilation gaps are communicated to form a ventilation air duct, so that cooling air can be smoothly output from the ventilation opening at the other end after entering the ventilation air duct from the ventilation opening at one end, thereby improving the circulation rate of the cooling air and realizing rapid heat dissipation of the first laminate and the second laminate; the radiating fins are arranged in parallel and are uniformly distributed on the first laminate, so that a cold air channel is formed between the adjacent radiating fins, the heat exchange area and the heat exchange efficiency of cold air and the first laminate are further increased, and the cooling effect of the battery shell structure is better.

Another object of the utility model is to provide a battery pack to can strengthen the heat transfer effect of casing, improve the cooling efficiency to the battery module.

a battery pack is provided with a battery module and the battery shell structure of any one of the technical schemes, wherein the battery module is positioned on one side of the second laminate, which is back to the first laminate.

The advantages of the battery pack and the battery shell structure are the same compared with the prior art, and are not described in detail herein.

Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of a specific embodiment of a battery case plate structure according to an embodiment of the present invention;

FIG. 2 is a front view of the battery case plate structure shown in FIG. 1;

FIG. 3 is a rear view of the battery case plate structure shown in FIG. 1;

FIG. 4 is a bottom view of the battery case plate structure shown in FIG. 1;

FIG. 5 is a top view of the battery case plate structure shown in FIG. 1;

FIG. 6 is a left side view of the battery case plate structure shown in FIG. 1;

FIG. 7 is a right side view of the battery case plate structure shown in FIG. 1;

fig. 8 is a schematic structural diagram of an embodiment of a battery pack according to the present invention;

fig. 9 is a cross-sectional view of a battery pack according to an embodiment of the present invention;

fig. 10 is a partial view of a battery pack according to an embodiment of the present invention.

Description of reference numerals:

1 first layer 11 radiating fin

2 second layer board 3 side board

31 vent 4 shell plate connecting part

5 reinforcing rib 6 ventilation gap

7 Battery module

Detailed Description

In the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict.

In addition, the terms "inside", "outside", "upper", "lower", and the like referred to in the embodiments of the present invention indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and "upper" refers to the top of the battery pack, and correspondingly "lower" refers to the bottom of the battery pack, "inner" refers to the inside of the hollow cavity, and "outer" refers to the outside of the hollow cavity. The terminology is based on the orientations and positional relationships illustrated in the drawings and is not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and is not to be construed as limiting the invention.

It is to be understood that, unless expressly stated or limited otherwise, the terms "connected," "mounted," and "contacting" are intended to be open-ended, i.e., connected as either a fixed or removable connection or an integral connection; the components may be directly connected or indirectly connected through an intermediate medium, or the components may be connected through an intermediate medium or the components may be in an interactive relationship with each other. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.

The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.

The utility model discloses the battery shell structure that the first aspect provided, refer to fig. 1 to 7, including first plywood 1, second plywood 2 and two sets of relative curb plate 3, first plywood 1, second plywood 2 enclose into the cavity with curb plate 3, are provided with additional strengthening in the cavity, and the outside of first plywood 1 is provided with heat radiation structure, is provided with a plurality of vents 31 on the curb plate 3 to can form the ventilation air duct in the cavity.

The utility model discloses in, the shell plate structure of battery can be used as the shell plate of the arbitrary one side of battery can casing, under the preferred condition, is used as the lower shell plate of battery package casing. It can be understood that, when the ventilation openings 31 are not arranged on the side plates 3, the hollow cavity is a hollow closed structure, and when the ventilation openings 31 are arranged, the hollow cavity can be distributed on one or more side plates 3, one ventilation air channel or a plurality of ventilation air channels can be formed in the hollow cavity, and each ventilation air channel corresponds to at least two ventilation openings 31, so that the ventilation openings 31 corresponding to the ventilation air channels are in an air circulation state; the first layer plate 1 and the second layer plate 2 are preferably made of a material capable of conducting heat, such as a metal material, so that the first layer plate 1 and the second layer plate 2 can rapidly exchange heat with cold air.

The utility model discloses in, the side of second plywood 2 first plywood 1 dorsad sets up to planar structure to in battery module 7's installation, specifically, second plywood 2 can set up to the dull and stereotyped structure of metal, for example, second plywood 2 sets up to flat aluminum plate.

When the battery shell structure provided by the basic scheme is applied to a lithium battery, one side, back to the first layer plate 1, of the second layer plate 2 is connected with the battery module 7, the battery module 7 generates a large amount of heat in the working process, so that the local temperature of the battery module 7 is increased, the heat of the battery module 7 is transferred to the second layer plate 2, at the moment, cold air can enter the hollow cavity from one part of the vents 31 and is conveyed to the other part of the vents 31 through the air duct to flow out of the hollow cavity, so that the air in the hollow cavity is in a flowing state, the air in the air duct can directly contact with the second layer plate 2 to exchange heat, the heat exchange area for dissipating heat of the battery shell structure is increased, the air heat preservation effect in the hollow cavity can be effectively avoided, and the overall cooling efficiency of the lithium battery is further improved; meanwhile, the second layer plate 2 and part of heat in the hollow cavity are transferred to the first layer plate 1, so that the temperature of the first layer plate 1 rises, the heat exchange area of external cold air and the first layer plate 1 can be further increased by the heat dissipation structure, the heat exchange effect of the first layer plate 1 is enhanced, the heat dissipation cooling rate of the whole battery shell structure is accelerated, and the over-high temperature of the battery module 7 is avoided.

In the utility model, the reinforcing structure can be a reinforcing plate or a reinforcing block protruding from the first layer plate 1 or the second layer plate 2, and the ventilation air channel is formed by communicating the ventilation opening 31 with the hollow cavity; the reinforcing structure can also be provided with a plurality of reinforcing ribs 5 connected with the first layer plate 1 and/or the second layer plate 2, a path for conveying cooling air is formed in the hollow cavity through the arrangement mode of two or more reinforcing ribs 5, and the ventilation opening 31 is matched with and communicated with the path of the cooling air to form a ventilation air channel.

As a preferred embodiment of the middle reinforcing structure of the present invention, referring to fig. 9, the reinforcing structure includes a plurality of reinforcing ribs 5 located in the hollow cavity, the upper and lower ends of the reinforcing ribs 5 are respectively connected with the first layer board 1 and the second layer board 2, and the reinforcing ribs 5 are matched with the ventilation openings 31 to form ventilation air channels. The upper and lower ends of the reinforcing rib 5 refer to both ends of the reinforcing rib 5 in the height direction of the battery case plate structure or the side plate 3. At this moment, the reinforcing rib 5 can be connected with the side plate 3 at two ends along the length direction, also can be connected with the side plate 3 at one end, or both ends are not connected with the side plate 3, namely, the reinforcing rib 5 can be used for cooling air circulation between one end or both ends along the length direction and the side plate 3, correspondingly, a path for conveying cooling air is formed in the hollow cavity through the arrangement mode of two or more reinforcing ribs 5, and the ventilation opening 31 is matched with and communicated with the path of the cooling air to form a ventilation air channel.

Preferably, the reinforcing ribs 5 are connected at both ends in the length direction thereof to a set of side plates 3 positioned in the length direction of the hollow cavity. The length direction of the reinforcing ribs 5 can be consistent with the length direction of the hollow cavity, and a certain included angle can also be formed between the length direction of the reinforcing ribs and the length direction of the hollow cavity.

The utility model discloses in, a plurality of strengthening ribs 5 can be mutual parallel arrangement, also can be intercrossing setting, and when a plurality of strengthening ribs 5 parallel arrangement, preferably evenly distributed is in the cavity. As the utility model discloses a well strengthening rib 5's a preferred embodiment, a plurality of strengthening rib 5 parallel arrangement form ventilation gap 6 between the adjacent strengthening rib 5, and at least one ventilation gap 6's both ends are provided with vent 31 to make vent 31 and the ventilation gap 6 intercommunication that corresponds form the ventilation duct. At this time, after the cooling air enters the ventilation air duct from the ventilation opening 31 at one end, the cooling air can be smoothly output from the ventilation opening 31 at the other end, so that the circulation rate of the cooling air is improved, and the rapid heat dissipation of the first layer plate 1 and the second layer plate 2 is realized.

The utility model discloses in, heat radiation structure can set up to be located the recess or the protruding structure in the 1 outside of first plywood to increase the contact heat transfer area of cold air and first plywood 1. As the utility model discloses well heat radiation structure's a preferred embodiment, heat radiation structure includes a plurality of radiating fin 11 of being connected with first plywood 1, and radiating fin 11 sets up in one side of first plywood 1 second plywood 2 dorsad. On partial heat of first plywood 1 can transmit to radiating fin 11, radiating fin 11 not only can contact the heat dissipation with cold air, can also further strengthen the mobility of air in the 1 outside of first plywood, improve the heat exchange efficiency of air and first plywood 11.

Under the preferred circumstances, a plurality of radiating fins 11 set up and evenly distributed on first plywood 1 in parallel for also form cold air passageway between the adjacent radiating fin 11, further increase cold air and first plywood 1's heat exchange area and heat exchange efficiency, make the cooling effect to battery shell structure more excellent.

Further preferably, the heat dissipation fins 11 are disposed to extend along the length direction of the hollow cavity and perpendicular to the first layer plate 1, so that the heat exchange effect between the cold air and the first layer plate 1 is better.

The utility model discloses in, for the installation stability who improves battery shell structure, be provided with shell plate connecting portion 4 on a set of relative curb plate 3 at least. The shell plate connecting part 4 can be used for being connected with other parts of the lithium battery and can also be used for being connected and fixed with parts of the whole vehicle.

The utility model discloses the battery package that the second aspect provided, refer to fig. 8 to 10, be provided with battery module and above-mentioned arbitrary technical scheme battery shell structure, battery module is located one side of second plywood 2 first plywood 1 dorsad. Preferably, the battery case plate structure serves as a lower case plate of the battery pack case in which the battery module 7 is mounted.

As a relatively preferred embodiment of the battery pack of the present invention, the battery pack comprises a housing and a battery module 7, wherein the lower plate of the housing comprises a first plate 1, a second plate 2 and two sets of opposite side plates 3, the first plate 1 and the second plate 2 are made of aluminum, the second plate 2 is an aluminum plate, the first plate 1, the second plate 2 and the side plates 3 enclose a hollow cavity, a reinforcing structure is arranged in the hollow cavity, the reinforcing structure comprises a plurality of reinforcing ribs 5 positioned in the hollow cavity, the upper and lower ends of the reinforcing ribs 5 are respectively connected with the first plate 1 and the second plate 2, the length direction of the reinforcing ribs 5 is consistent with the length direction of the hollow cavity, and the two ends along the length direction are connected with the side plates 3, the plurality of reinforcing ribs 5 are arranged in parallel, ventilation gaps 6 are formed between the adjacent reinforcing ribs 5, the two ends of the plurality of ventilation gaps 6 are provided with ventilation openings 31 positioned on the side plates 3, so that the ventilation openings 31 are communicated with the corresponding ventilation gaps 6 to form ventilation air channels; the outside of first plywood 1 is provided with heat radiation structure, heat radiation structure includes a plurality of radiating fin 11 of being connected with first plywood 1, radiating fin 11 sets up in the below of first plywood 1, a plurality of radiating fin 11 parallel arrangement and evenly distributed are on first plywood 1, radiating fin 11 sets up to extend for the length direction along the cavity, and perpendicular with first plywood 1, be provided with shell plate connecting portion 4 on two sets of relative curb plates 3 respectively, the lower casing installation of casing is second plywood 2 towards battery module 7.

According to the battery pack provided by the embodiment, the battery module 7 generates a large amount of heat in the working process, so that the local temperature of the battery module 7 is increased, the heat of the battery module 7 is transferred to the second layer plate 2, at the moment, cold air can enter the corresponding ventilation gap 6 from the ventilation opening 31 at one end and then is conveyed to the ventilation opening 31 at the other end through the ventilation gap 6 to flow out, so that the air in the hollow cavity is in a flowing state, and meanwhile, the air in the ventilation air channel can directly contact with the second layer plate 2 to exchange heat, so that the heat exchange area for radiating the battery shell structure is increased, the air heat preservation effect in the hollow cavity can be effectively avoided, and the overall cooling efficiency of the lithium battery is further improved; in addition, partial heat transfer in second plywood 2 and the cavity is to first plywood 1, make 1 temperature of first plywood rise, radiating fin 11 sets up the bottom of casing under, can borrow the driving in-process and blow the wind energy that has passed to battery module 7 because of the produced casing bottom of the speed of a motor vehicle down and come cooling, can further increase external cold air and the heat transfer area of first plywood 1, strengthen and the heat transfer effect of first plywood 1, accelerate the holistic heat dissipation cooling rate of battery shell structure, avoid battery module 7's high temperature.

As can be seen from the above description, the battery case plate structure of the present invention is provided with a plurality of vents 31 on the side plate 3 of the hollow cavity to form a ventilation duct in the hollow cavity, so that the air in the hollow cavity is in a flowing state, and meanwhile, the cold air in the ventilation duct can directly contact with the second laminate 2 for heat exchange, thereby not only increasing the heat exchange area for dissipating heat of the battery case plate structure, but also effectively avoiding the formation of air heat preservation in the hollow cavity, and further improving the cooling efficiency of the whole lithium battery; the outside of first plywood 1 is provided with heat radiation structure, can further increase the heat transfer area of cold air and battery shell plate structure, and the heat transfer effect of reinforcing shell plate avoids the inside high temperature of lithium cell.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a battery shell structure, its characterized in that includes first plywood (1), second plywood (2) and two sets of relative curb plate (3), first plywood (1) second plywood (2) with curb plate (3) enclose into the cavity, be provided with additional strengthening in the cavity, the outside of first plywood (1) is provided with heat radiation structure, be provided with a plurality of vents (31) on curb plate (3), with can be in form the ventilation flue in the cavity.

2. The battery case plate structure according to claim 1, wherein the reinforcing structure comprises a plurality of reinforcing ribs (5) located in the hollow cavity, the upper and lower ends of the reinforcing ribs (5) are respectively connected with the first laminate (1) and the second laminate (2), and the reinforcing ribs (5) are matched with the ventilation openings (31) to form the ventilation air ducts.

3. The battery case plate structure according to claim 2, wherein both ends of the reinforcing rib (5) in the length direction thereof are connected to a set of the side plates (3) located in the length direction of the hollow cavity.

4. The battery case plate structure according to claim 3, wherein a plurality of the reinforcing ribs (5) are arranged in parallel, ventilation gaps (6) are formed between adjacent reinforcing ribs (5), and the ventilation openings (31) are arranged at two ends of at least one ventilation gap (6), so that the ventilation openings (31) are communicated with the corresponding ventilation gaps (6) to form the ventilation air ducts.

5. The battery case plate structure according to any one of claims 1 to 4, wherein the heat dissipation structure comprises a plurality of heat dissipation fins (11) connected to the first laminate sheet (1), the heat dissipation fins (11) being disposed on a side of the first laminate sheet (1) facing away from the second laminate sheet (2).

6. The battery case plate structure according to claim 5, wherein a plurality of the heat dissipation fins (11) are arranged in parallel and uniformly distributed on the first laminate sheet (1).

7. The battery case plate structure according to claim 5, wherein the heat dissipation fins (11) are disposed to extend in a length direction of the hollow cavity, and are perpendicular to the first laminate sheet (1).

8. The battery case plate structure according to any one of claims 1 to 4, wherein the second laminate sheet (2) is a flat metal sheet.

9. The battery case plate structure according to any one of claims 1 to 4, wherein at least one set of the opposing side plates (3) is provided with a case plate connecting portion (4).

10. A battery pack, characterized in that a battery module (7) and a battery shell structure according to any one of claims 1 to 9 are provided, the battery module (7) being located on the side of the second laminate (2) facing away from the first laminate (1).