CN219163578U - Power battery pack - Google Patents

Abstract

The utility model discloses a power battery pack, which comprises a lower shell, a cooling plate and a reinforcing plate, wherein the lower shell is surrounded by four-sided frames and is used for limiting an assembly space, a battery module is arranged in the assembly space, the cooling plate is fixedly connected with the lower shell and forms the bottom surface of the assembly space, the cooling plate is attached to the bottom of the battery module and is suitable for exchanging heat with the battery module in the lower shell, the reinforcing plate is attached and fixed to the bottom of the cooling plate, and the reinforcing plate is arranged at the connection position of the cooling plate and the lower shell.

Description

Power battery pack

Technical Field

The utility model relates to the field of design of matrix battery packs of new energy automobiles, and mainly comprises a power battery pack.

Background

The modern automobile industry is revolutionarily changed, namely, the traditional fuel automobiles are gradually replaced by new energy automobiles, wherein pure electric automobiles are emerging as one of the new energy automobiles, and a plurality of transmission fuel automobile platforms directly change the power source of the automobiles from fuel to a battery by changing the engine structure to a power battery pack structure, so that the new energy automobiles emerge along with the market. With the higher demand of people on the continuation of journey of electric automobile, the same battery parameter means that more batteries need to be arranged in the battery pack of the electric automobile with higher continuation of journey mileage, and the matrix type battery pack can greatly improve the battery pack volume utilization rate and the whole automobile continuation of journey mileage.

The matrix type battery pack in the current market is regular in size, large in mass, poor in structural integrity, less in connection with the safety of the whole vehicle, incapable of playing a role in strengthening the structural performance of the whole vehicle, and free of global design.

In addition, the structural consideration of the existing matrix battery pack is less, the concept of regional block design is not adopted, and the structural performance and the safety hidden trouble of thermal runaway of the battery pack are large.

Disclosure of Invention

In some embodiments of the present application, a power battery pack is provided, which solves the problems of poor integrity, low structural strength and high quality of the power battery pack in the prior art.

In some embodiments of the application, a power battery pack is disclosed, the battery pack is applicable to four-wheel drive or multiple motorcycle types that drive, adopt jumbo size battery module, it includes down casing, cooling plate and stiffening plate, the casing encloses down and establishes into four sides framework for inject the assembly space, lay battery module in the assembly space, cooling plate and casing fixed connection just form the bottom surface in assembly space down, the cooling plate is attached in battery module bottom, be suitable for with the battery module heat transfer in the inferior valve, the stiffening plate is attached to the bottom of being fixed in the cooling plate, the stiffening plate sets up in the hookup location of cooling plate and inferior valve.

According to the technical scheme, the bottom of the shell is provided with the cooling plate, the local stress concentration position of the cooling plate is required to be reinforced through the reinforcing plate, the thickness of the cooling plate can be thinned when the overall stability and the structural strength of the connecting structure are enhanced, and the battery pack weight reduction is integrally carried out.

In some embodiments of the present application, the lower housing includes an outer frame and an inner beam, the peripheral end of the cooling plate is fixedly connected with the outer frame, the reinforcing plate is disposed on one side close to the outer frame, and the inner beam is disposed in the assembly space and is fixedly connected with the outer frame.

Wherein, the inner beam divides the assembly space into a plurality of sub-assembly spaces for mounting the battery module.

In some embodiments of the present application, the cooling plate is affixed to the inner beam.

In some embodiments of the present application, the inner beam includes at least one longitudinal beam and one transverse beam, the longitudinal beam and the transverse beam being disposed crosswise.

In some embodiments of the application, the battery module comprises a plurality of electric cores, the electric cores are respectively and correspondingly arranged in the plurality of sub-assembly spaces, and the electric cores are attached and fixed on the cooling plate.

In some embodiments of the application, an adhesive is arranged between the reinforcing plate surface of the battery cell and the plate surface of the cooling plate, and the battery cell is adhered and fixed through the adhesive, wherein the area of the single battery cell adhered to the water cooling plate accounts for 85% -98% of the area of the bottom surface of the single battery cell.

In some embodiments of the present application, at least one side end of the battery module is outside the cooling region of the cooling plate.

In some embodiments of the present application, a module pressing plate is stuck to the top of the battery module, and the module pressing plate is used for fixing the plurality of battery cells to form a whole.

In some embodiments of the present application, the ratio of the thickness of the reinforcing plate to the thickness of the cooling plate ranges from 0.8 to 2.5, the ratio of the width of the reinforcing plate to the width of the battery module ranges from 0.05 to 0.3, and the ratio of the length of the reinforcing plate to the length of the battery module ranges from 0.3 to 1.4.

The utility model has the beneficial effects that:

1) The bottom plate of the existing power battery pack is canceled, and the cooling plate is used for replacing the bottom plate, so that the overall quality of the battery pack is reduced;

2) The battery module is attached and fixed on the cooling plate, so that the battery module and the cooling plate are better in integrity, and the battery module bears a part of stress, so that the stress of the cooling plate is reduced;

3) The cooling plate bottom is concentrated with lower casing hookup location stress, sets up the scheme of stiffening plate, and the pertinence carries out the reinforcement to the stress concentration position of cooling plate, based on this, can attenuate the thickness of cooling plate itself, further realizes the whole of battery package and subtracts heavy, and makes its structural strength promote.

Drawings

FIG. 1 is a schematic view of the overall structure of a power cell pack (top) of the present utility model;

FIG. 2 is a schematic view of the overall structure of the power cell pack (bottom) of the present utility model;

FIG. 3 is a schematic illustration of a half-section of a power cell pack of the present utility model;

fig. 4 is a schematic structural view of a battery module according to the present utility model;

fig. 5 is a schematic view of the mounting structure of the battery module and the lower case of the present utility model;

FIG. 6 is a schematic view of the structure of the lower housing of the present utility model;

FIG. 7 is a schematic illustration of a half-section of a power cell pack of the present utility model;

FIG. 8 is an exploded view of the structure of the present utility model;

fig. 9 is a schematic structural view of a modular platen according to the present utility model.

Reference numerals:

comprising the following steps: 1. a power battery pack; 100. a lower housing; 110. an outer frame; 120. an inner beam; 130. a faying surface; 131. an avoidance groove; 121. a longitudinal beam; 122. a cross beam; 200. a battery module; 210. a battery cell; 220. a module pressing plate; 300. a cooling plate; 400. and a reinforcing plate.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The application provides a power battery pack, has solved the prior art and has dismantled the problem that the degree of difficulty is high, the dismantlement risk is big that the in-process appears at the oil pump motor.

In some embodiments of the present application, as shown in fig. 1, 2, 3 and 8, a power battery pack 1 is disclosed, which is suitable for a four-wheel drive or two-wheel drive vehicle type, and a large-sized battery module 200 is used.

The power battery pack 1 includes a lower case 100, a cooling plate 300, and a reinforcing plate 400.

The lower case 100 is enclosed in a four-sided frame for defining an assembly space in which the battery module 200 is mounted.

The cooling plate 300 is fixedly connected with the lower case 100 and forms the bottom surface of the assembly space, and the cooling plate 300 is attached to the bottom of the battery module 200, adapted to exchange heat with the battery module 200 in the lower case 100.

The reinforcing plate 400 is attached to the bottom of the cooling plate 300, and the reinforcing plate 400 is disposed at a connection position between the cooling plate 300 and the lower case 100.

In this embodiment, the cooling plate 300 is directly fixed to the lower case 100, and the battery module 200 is directly mounted on the cooling plate 300.

Compared with the prior art, the technical scheme of the application is characterized in that:

in the power battery pack of the prior art, the lower housing is usually a semi-closed box, a closed bottom plate is formed at the bottom, the cooling plate and the battery module are fixedly mounted on the bottom plate, the power battery pack 1 designed in the application cancels the bottom plate arrangement of the existing power battery pack, and the cooling plate 300 is utilized to replace the bottom plate, so that the overall quality of the battery pack is reduced, on the one hand, and on the other hand, the cooling plate 300 is limited by materials and has lower strength, so that the battery module 200 is attached and fixed to the cooling plate 300, the battery module 200 and the cooling plate 300 form an integral structure, so that part of stress of the cooling plate 300 can be shared by the battery module 200, the stress of the cooling plate 300 is reduced, and in addition, the stress at the connecting position of the cooling plate 300 and the lower housing 100 is concentrated, the cooling plate 300 is easy to fail, and the reinforcing plate 400 is additionally arranged at the position, so that the structural strength of the cooling plate 300 is further enhanced.

In some embodiments of the present application, as shown in fig. 5 and 6, the lower case 100 includes an outer frame 110 and an inner beam 120.

The outer end of the cooling plate 300 is fixedly connected with the outer frame 110, the reinforcing plate 400 is arranged at one side close to the outer frame 110, and the inner beam 120 is arranged in the assembly space and is fixedly connected with the outer frame 110.

Wherein the inner beam 120 partitions the assembly space into a plurality of sub-assembly spaces for mounting the battery module 200.

The outer frame 110 forms the outer contour of the lower housing 100, and the inner beam 120 increases the overall structural strength of the lower housing 100.

In addition, the inner beam 120 divides the assembly space into a plurality of sub-assembly spaces, so that the power battery pack 1 can be flexibly arranged, the structure is good, and the module arrangement can be flexibly adjusted according to the structural performance in the specific battery module 200 installation process.

Based on the above embodiment, the cooling plate 300 is attached and fixed to the inner beam 120.

It should be noted that, the whole large cooling plate 300 is used at the bottom of the lower housing 100, so that the assembly time can be saved, but the large cooling plate 300 is easy to deform in the actual installation process, and the problem can be well solved by fixing the cooling plate 300 and the inner beam 120, the inner beam 120 receives part of the cooling plate 300, the whole large cooling plate 300 is divided into a plurality of parts of the cooling plates 300, the cooling plate 300 is not easy to deform, and the inner beam 120 can bear the stress of a part of the cooling plate 300, so that the stress load of the cooling plate 300 is reduced.

Based on the above embodiment, as shown in fig. 6, the inner beam 120 includes at least one longitudinal beam 121 and one transverse beam 122, and the longitudinal beam 121 and the transverse beam 122 are disposed to intersect.

The present embodiment can further strengthen the fixing effect of the cooling plate 300 and strengthen the overall structural strength of the lower case 100 based on the effect of the inner beam 120.

In some embodiments of the present application, as shown in fig. 2, 5, 6, 7, and 8, the cooling plate 300 is a water-cooled plate.

The water cooling plate is provided with a convex refrigerant circulation channel.

In the above embodiment, only one embodiment of the cooling form of the cooling plate 300 is used, and in practical production applications, the cooling plate 300 is selected as a water cooling plate, and the specific installation form of the water cooling plate and the lower housing 100 and the partial adaptation improvement of the water cooling plate to the inner beam 120 of the lower housing 100 are specifically disclosed in the above embodiment.

In view of this, the above-mentioned form of selecting the cooling plate 300 as a water cooling plate is only one embodiment adopted based on the basic technical concept of the present application, in other embodiments of the present application, the cooling plate 300 may be selected from other forms of cooling plates 300, such as an air cooling plate or an oil cooling plate, and other adaptation to the shape of the corresponding components mounted on the cooling plate 300, such as the inner beam 120, may be performed for the cooling plate 300 of different cooling forms, so it is to be noted that, based on the basic technical concept of the present application, the cooling plate 300 is directly fixed on the lower case 100, and the battery module 200 is directly mounted on the cooling plate 300, no matter what cooling form the cooling plate 300 adopts, it is within the scope of the present application.

In some embodiments of the present application, as shown in fig. 4, 5 and 8, the battery module 200 includes a plurality of battery cells 210, the plurality of battery cells 210 are respectively disposed in the plurality of sub-assembly spaces, and the battery cells 210 are attached to and fixed on the cooling plate 300.

It should be noted that, based on the design form of the inner frame 110 and the inner beam 120 in the lower housing 100, the battery module 200 is correspondingly designed as a split type, the battery module 200 is composed of a pair of electric cores 210, and one or more electric cores 210 are placed in each sub-assembly space, so that the arrangement mode of the electric cores 210 is flexible, and the module arrangement can be flexibly adjusted according to the structural performance.

In addition, since the battery cell 210 is fixed to the cooling plate 300, the battery cell 210 itself also bears part of the stress, so that the split battery cell 210 can share more force than the integral battery cell 210, because if the battery module 200 is integrally formed, the overall size of the battery module 200 tends to be large, the large-volume battery cell 210 is easy to deform, the overall strength of the power battery pack 1 is affected, and the small-volume battery cell 210 can bear more force.

In some embodiments of the present application, an adhesive is disposed between the surface of the reinforcing plate 400 of the battery cell 210 and the surface of the cooling plate 300, and is adhered and fixed by the adhesive.

The entire battery module 200 is not fixed by bolts and is adhered to the lower case 100 and the water cooling plate by structural adhesive.

Wherein, the area of the single battery cell 210 adhered to the water cooling plate accounts for 85% -98% of the area of the bottom surface of the single battery cell 210.

It should be noted that, the cell 210 and the cooling plate 300 are adhered by the adhesive, so that the purpose is to enable the lamination of the cell 210 and the cooling plate 300 to be tighter, the effect of sharing the stress of the cooling plate 300 is better, the cell 210 is convenient to assemble and disassemble, and meanwhile, the lamination part of the cell 210 and the cooling plate 300 is left with a margin, so that the cell can form partial buffering.

In some embodiments of the present application, at least one side end of the battery module 200 is outside the cooling region of the cooling plate 300.

In some embodiments of the present application, as shown in fig. 8 and 9, a module pressing plate 220 is adhered to the top of the battery module 200, and the module pressing plate 220 is used to fix the plurality of battery cells 210 into a whole.

It should be noted that the module pressing plate 220 is used to increase the overall strength of the battery module 200.

In some embodiments of the present application, as shown in fig. 2, 3 and 7, the battery cell 210 has a large weight, the cooling plate 300 has a poor rigidity, and the cooling plate 300 cannot fully bear the weight of the battery cell 210 and is easily stressed too much to deform, so that the reinforcing plate 400 is connected below the cooling plate 300 in a welding, bonding or other manner, so that the stress on the edge of the cooling plate is reduced, and the safety of the battery pack in use is greatly improved.

The stiffening plate 400 corresponds to a local thickening of the cooling plate 300, and provides a stiffness improvement. The entire thickness of the cooling plate 300 can be reduced in the remaining portions where high rigidity is not required.

The function of the reinforcing plate 400 is explained as follows:

taking the 1m by 1m cooling plate 300 as an example, the overall thickness of 3.2mm can meet the structural strength requirement without local reinforcement, and the weight is 8.6kg.

The local reinforcement is carried out, the whole thickness of the cooling plate 300 is required to be 2.2mm, the weight is 5.9kg, the strength requirement can be met by matching with 1kg of reinforcing plate, the whole weight is 6.9kg, and the weight is reduced by 1.7kg. The weight reduction effect is obvious, and the rigidity of the cooling plate 300 is improved by more than 20 percent.

Specifically, the ratio of the thickness of the reinforcing plate 400 to the thickness of the cooling plate 300 ranges from 0.8 to 2.5, the ratio of the width of the reinforcing plate 400 to the width of the battery module 200 ranges from 0.05 to 0.3, and the ratio of the length of the reinforcing plate 400 to the length of the battery module 200 ranges from 0.3 to 1.4.

In the above embodiment, the size and structure limitation of the stiffening plate 400 is as follows: the quality of the reinforcing plate 400 is reduced as much as possible while satisfying the strength supplementing effect of the reinforcing plate 400 on the cooling plate 300.

It should be noted that, the length of the reinforcing plate 400 is added according to the required size, so that the rigidity of the cooling plate 300 can be ensured, and the cooling plate 300 can be reinforced according to the requirement.

For special cases, the length of each battery module 200 below the fixing area should be greater than or equal to 300mm, and if the length of the battery module 200 is too small, the strength of the battery module 200 is sufficient, and the reinforcing plate 400 is not required to be added in consideration of the effect of reducing the weight.

The utility model has the beneficial effects that:

the bottom plate setting of current power battery package has been cancelled, utilizes the cooling plate to replace the bottom plate, has reduced the holistic quality of battery package.

The battery module is attached and fixed on the cooling plate, so that the battery module and the cooling plate are better in integrity, the battery module bears a part of stress, and the stress of the cooling plate is reduced.

The cooling plate bottom is concentrated with lower casing hookup location stress, sets up the scheme of stiffening plate, and the pertinence carries out the reinforcement to the stress concentration position of cooling plate, based on this, can attenuate the thickness of cooling plate itself, further realizes the whole of battery package and subtracts heavy, and makes its structural strength promote.

Those of ordinary skill in the art will appreciate that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (9)

1. A power cell pack comprising:

the lower shell is surrounded into a four-sided frame body and is used for limiting an assembly space, and a battery module is placed in the assembly space;

the cooling plate is fixedly connected with the lower shell and forms the bottom surface of the assembly space, is attached to the bottom of the battery module and is suitable for exchanging heat with the battery module in the lower shell; and

the reinforcing plate is arranged at the connection position of the cooling plate and the lower shell.

2. The power cell pack of claim 1, wherein the lower housing comprises:

the outer frame is fixedly connected with the peripheral end part of the cooling plate, and the reinforcing plate is arranged on one side close to the outer frame; and

the inner beam is arranged in the assembly space and is fixedly connected with the outer frame;

wherein the inner beam partitions the assembly space into a plurality of sub-assembly spaces for mounting the battery module.

3. The power cell pack of claim 2, wherein the cooling plate is attached to the inner beam.

4. The power cell pack of claim 2 wherein the inner beam comprises at least one longitudinal beam and one transverse beam;

the longitudinal beams and the transverse beams are arranged in a crossing mode.

5. The power cell pack of claim 2, wherein the battery module comprises a plurality of cells;

the plurality of battery cells are respectively and correspondingly arranged in the plurality of sub-assembly spaces, and the battery cells are attached and fixed on the cooling plate.

6. The power battery pack according to claim 5, wherein an adhesive is arranged between the bottom surface of the battery cell and the plate surface of the cooling plate, and is adhered and fixed through the adhesive;

wherein, the area of the single battery cell adhered to the cooling plate accounts for 85% -98% of the area of the bottom surface of the single battery cell.

7. The power cell pack of claim 5, wherein at least one side end of the battery module is outside the cooling region of the cooling plate.

8. The power battery pack of claim 5, wherein a module pressing plate is adhered to the top of the battery module;

the module pressing plate is used for fixing a plurality of battery cells into a whole.

9. The power cell pack of claim 1, wherein the ratio of the thickness of the reinforcing plate to the thickness of the cooling plate is in the range of 0.8 to 2.5;

the ratio of the width of the reinforcing plate to the width of the battery module is in the range of 0.05-0.3;

the ratio of the length of the reinforcing plate to the length of the battery module is in the range of 0.3-1.4.

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