CN216085026U

CN216085026U - Battery pack shell and battery pack

Info

Publication number: CN216085026U
Application number: CN202121906688.1U
Authority: CN
Inventors: 李磊; 李军林
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2022-03-18
Anticipated expiration: 2031-08-13

Abstract

The utility model relates to the field of battery packs of electric automobiles, and provides a battery pack shell and a battery pack, which comprise a lower shell and a liquid cooling cover, wherein the lower shell is provided with a containing groove for containing a battery core; the liquid cooling lid approximately fits the notch of storage tank, the liquid cooling lid includes the upper cover plate and is located the lower apron of upper cover plate below, the upper cover plate with the apron lid is merged to form a plurality of arrays jointly and arranges in the liquid cooling runner of predetermineeing the plane, the liquid cooling runner is in it winds the extension to be the heliciform on the predetermined plane, the apron is in down the battery core is located can laminate in the storage tank time in the battery core. The plurality of liquid cooling runners can enable the heat of each region of the battery core to be more uniform, so that the condition that the temperature difference between one end of the battery core and the other end is too large is avoided, the condition of local overheating or supercooling is avoided, and the service life of the battery core is prolonged.

Description

Battery pack shell and battery pack

Technical Field

The utility model belongs to the technical field of new energy automobiles, and particularly relates to a battery pack shell and a battery pack.

Background

The electric automobile requires more and more high to battery package energy density, and the battery package of high density energy can increase whole car duration to promote product market competition, and under the unchangeable condition of current battery core's energy density, only rationally reduce spare part quantity and improve the energy density of battery package. Traditional battery package is equipped with the liquid cooling runner for realizing the heat dissipation of battery core in the battery package, realizes the cooling to the battery core through the heat exchange with the battery core. The liquid cooling flow channel generally extends from one side of the battery core to the other side of the battery core along the zigzag path, so that the temperature of the battery core is not uniformly reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a battery pack with a shell connected with the battery pack, and aims to solve the technical problem that a battery core is cooled unevenly by a liquid cooling flow channel in the prior art.

The present invention is achieved as such, a battery pack case comprising:

the lower shell is provided with a containing groove for containing the battery core body;

the liquid cooling lid, the lid fits the notch of storage tank, the liquid cooling lid includes the upper cover plate and is located the lower apron of upper cover plate below, the upper cover plate with the apron lid is merged and is formed a plurality of arrays jointly and arranges in the liquid cooling runner of predetermineeing the plane, the liquid cooling runner is in it winds the extension to be the heliciform on the predetermined plane, the apron is in down the battery core is located can laminate in the storage tank time in the battery core.

In one embodiment of the first aspect, at least two of the liquid cooling flow passages are mirror images.

In one embodiment of the first aspect, the lower case includes a frame and a bottom plate connected to the frame, the frame and the bottom plate together enclose the receiving groove, the frame is used for connecting the battery cores, and the bottom plate is spaced apart from the battery cores connected to the frame.

In one embodiment of the first aspect, the lower casing further includes at least one cross beam and at least one longitudinal beam, the cross beam and the longitudinal beam are both connected to the frame and intersect with each other, the cross beam and the longitudinal beam can divide the accommodating tank into a plurality of installation spaces, each installation space can accommodate one battery core, and the liquid cooling cover is connected to the frame, the cross beam and the longitudinal beam.

In one embodiment of the first aspect, the battery pack case further includes heat insulation and fire protection cotton disposed on a side of the liquid cooling cover away from the accommodating groove, a heat conducting pad disposed on the battery core, convection foam disposed between the liquid cooling cover and the frame, and heat insulation cotton disposed on the bottom plate.

In one embodiment of the first aspect, the battery pack case further comprises convection foam connected between the liquid cooling cover and the heat insulation and fire prevention foam.

In one embodiment of the first aspect, the battery pack housing further comprises a high voltage protection distribution box connected above the liquid cooling lid.

In one embodiment of the first aspect, the battery pack case further includes at least one socket connected to the lower case and capable of being electrically connected to the battery core, and the socket is used for electrically connecting the battery core with an external power utilization structure.

In one embodiment of the first aspect, the battery pack case further includes a sealing bolt for connecting the upper cover plate and the liquid cooling cover.

In a second aspect, the utility model further provides a battery pack, which includes a battery core body and the battery pack case as described above.

Compared with the prior art, the utility model has the technical effects that: the battery package casing realizes the heat dissipation of battery core through the liquid cooling runner of laminating mutually with the battery core, the extension route of liquid cooling runner is set up to the heliciform through the liquid cooling lid, make heat exchange fluid can follow the central point that the helix was radially internal to flow to the spiral earlier through the liquid cooling runner and put, outwards flow along the helix, the liquid cooling runner just can make the heat in each region of battery core more even like this, and be unlikely to appear the too big condition of the difference in temperature of battery core one end and the other end, avoid appearing the condition of local overheat or subcooling, be favorable to improving the life-span of battery core.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a perspective view of a battery pack case according to an embodiment of the present invention;

FIG. 2 is a partial block diagram of the battery pack housing of FIG. 1;

fig. 3 is an exploded view of the battery pack case of fig. 1.

Description of reference numerals:

11. a lower housing; 101. a containing groove; 11. a frame; 120. a base plate; 20. a liquid cooling cover; 13. a cross beam; 14. a stringer; 15. a high voltage protection distribution box; 21. a liquid cooling flow passage; 22. an installation part; 30. a seal bolt; 40. a socket; 51. heat-insulating fireproof cotton; 52. convection bubble cotton; 53. a thermally conductive pad; 54. sealing the foam; 55. heat preservation cotton; 90. a battery core body.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, 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, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.

The utility model provides a battery pack shell, which comprises a lower shell 10 and a liquid cooling cover 20. At least one battery core 90 can be mounted within the battery can housing to form a battery pack. The battery pack is used for assembling an electric automobile to provide electric power for the electric automobile.

Referring to fig. 1 and fig. 3, the lower housing 10 is provided with a receiving groove 101 for receiving the battery core 90, and the liquid cooling cover 20 covers the notch of the receiving groove 101 and is connected to the lower housing 10 to encapsulate the battery core 90 in the receiving groove 101. In this embodiment, the direction of the upper cover plate relative to the lower housing 10 is upward, the direction of the lower housing 10 relative to the upper cover plate is downward, the notch of the receiving groove 101 faces upward, and the vertical direction is the height direction of the battery pack housing. The upper cover plate has a mounting surface facing the accommodating groove 101, i.e., the mounting surface faces downward.

The lower housing 10 includes a frame 11 and a bottom plate 12 connected to the frame 11, the frame 11 is frame-shaped and has openings at two ends thereof, that is, an upper opening and a lower opening, the bottom plate 12 is connected to the lower side of the frame 11 and encapsulates the lower opening of the frame 11, the frame 11 and the bottom plate 12 enclose a containing groove 101, the upper opening of the frame 11 is a notch of the containing groove 101, the frame 11 is used for connecting the battery core 90, and the bottom plate 12 is parallel to the upper cover plate.

Referring to fig. 2 and 3, the liquid cooling cover 20 includes an upper cover plate and a lower cover plate, the lower cover plate is located below the upper cover plate, the upper cover plate and the lower cover plate are combined together to form the liquid cooling flow channel 21, the liquid cooling flow channel 21 is spirally wound and extends on a predetermined plane, and the liquid cooling flow channel 21 can be attached to the battery core 90 when the battery core 90 is located in the accommodating groove 101. It can be understood, the extending direction of liquid cooling runner 21 is for being put the spiral by the outer lane to predetermineeing planar central point and coil, spiral when predetermineeing near planar central point again reverse orientation outer lane spiral coil, can let in liquid in the liquid cooling runner 21, the lower cover plate has good heat conductivility, when battery core 90 installs in storage tank 101, the lower cover plate laminates with battery core 90 mutually, in order to pass through the heat of battery core 90 and pass through the liquid that the lower cover plate conveyed to in the liquid cooling runner 21, thereby take away the heat of battery core 90, realize the cooling to battery core 90. The cross-sectional shape of the liquid cooling flow path 21 is not particularly limited, and may be circular, elliptical, polygonal, irregular, or the like.

The liquid cooling cover 20 of the battery pack shell is provided with the liquid cooling runner 21, which is equivalent to combining the existing upper cover and the liquid cooling pipeline into a whole, thereby not only saving the space, but also saving the resources. Battery package casing realizes battery core 90's heat dissipation through the liquid cooling lid 20 of laminating mutually with battery core 90, liquid cooling lid 20 sets up to the heliciform through the extension route with liquid cooling runner 21, make heat exchange fluid can follow the central point that the helix was radially internal flow to the spiral earlier through liquid cooling runner 21 and put, outwards flow along the helix route again, the extension route of liquid cooling runner 21 is longer like this, the liquid pressure drop in the liquid cooling runner 21 has been reduced, the liquid velocity of flow has also been reduced, the radiating efficiency has been improved, just, the heat that can make each region of battery core 90 is more even, and be unlikely to the condition that the difference in temperature of battery core 90 one end and the other end is too big, avoid appearing the condition of local overheat or subcooling, be favorable to improving battery core 90's life-span.

Traditional liquid cooling runner 21 generally sets up in battery core below, and laminate mutually with the lower surface of battery core, because the bottom plate of battery package will satisfy the ball hitting requirement, liquid cooling runner 21 weeping when avoiding the ball hitting simultaneously, consequently, need set up bearing structure between bottom plate and liquid cooling runner 21, bearing structure can prop up liquid cooling runner 21 on the one hand, depression battery core lower surface contacts, on the other hand makes and leaves the space between liquid cooling runner 21 and the bottom plate, prevent that the bottom plate from receiving deformation after the striking and damaging liquid cooling runner 21, and lead to liquid cooling runner 21 weeping, and then cause the battery core to catch fire. But the arrangement of the supporting structure increases the components of the battery pack shell, increases the whole weight of the battery pack shell, and influences the realization of light weight of the battery pack shell. In addition, for reducing the heat above the battery core, the upper cover plate is spaced from the battery core, so that the heat of the battery core is dissipated through a gap between the upper cover plate and the battery core. However, the height of the battery pack shell in the height direction is increased, the occupied space of the battery pack shell in the height direction inside the electric automobile is increased, the requirement for the size of the space in the height direction is smaller and smaller for better streamline shape, seat wrapping feeling and riding experience of the whole automobile, and the existing battery pack shell cannot meet the requirement.

In contrast, in the present embodiment, the lower cover plate is attached to the upper cover plate and can be attached to one side of the battery core 90 facing the upper cover plate when the battery core 90 is located in the accommodating groove 101, and the bottom plate 12 is spaced from the battery core 90 connected to the frame 11. That is, the liquid cooling flow path 21 is located between the upper cover plate and the battery core 90, and is attached to both the mounting surface of the upper cover plate and the upper surface of the battery core 90. When the installation, lower apron can bond with battery module top. Therefore, a supporting structure is not needed to be arranged between the battery core body 90 and the bottom plate 12, the number of parts inside the battery pack shell is reduced, the whole weight is reduced, the processing cost is reduced, the assembling procedures are reduced, the production timeliness is improved, and the energy density of the battery pack can be improved by reducing the number of the parts. When the bottom plate 12 of the battery core 90 is impacted, the liquid cooling flow channel 21 is positioned above the battery core 90, so that liquid leakage of the liquid cooling flow channel 21 is avoided, and the risk of explosion caused by electric conduction and fire of the battery pack is reduced. The clearance between battery core 90 and bottom plate 12 provides the deformation space for bottom plate 12, and the impact can not directly strike battery core 90 through bottom plate 12, avoids battery core 90 to receive the damage, has improved the security of bottom ball hit. Meanwhile, the gap between the bottom plate 12 and the battery core 90 can be used for heat dissipation below the battery core 90. In addition, because the liquid cooling runner 21 realizes the heat dissipation above the battery core 90, the upper cover plate, the liquid cooling runner 21 and the battery core 90 can be sequentially and tightly attached without a gap, so that the total height of the battery pack shell in the height direction is reduced, the occupied space of the battery pack shell in the electric automobile is saved, and the space utilization rate inside the electric automobile is improved.

It should be noted that, the battery core 90 and the lower cover plate can be directly attached to each other, or indirectly attached to each other through other structures that are attached to each other, for example, a heat conducting plate is disposed between the battery core 90 and the lower cover plate, and the heat conducting plate is attached to the lower cover plate and also attached to the battery core 90 in the accommodating groove 101, so as to improve the heat transfer efficiency between the lower cover plate and the battery core 90.

Referring to fig. 3, the upper cover plate and the lower cover plate are combined together to form a plurality of liquid cooling channels 21 arranged in an array on a predetermined plane, that is, the liquid inlet of a spiral liquid cooling channel 21 is communicated with the liquid outlet of a spiral liquid cooling channel 21, so that the length of the plurality of liquid cooling channels 21 arranged on the liquid cooling cover 20 is longer than that of the single liquid cooling channel 21, which increases the flowing time of the liquid in the liquid cooling channel 21, and is beneficial to sufficient heat dissipation. When only single battery core 90 in storage tank 101, a plurality of liquid cooling runners 21 can make each regional heat dissipation of this battery core 90 even, when a plurality of battery cores 90 have been held in storage tank 101, each battery core 90 all can cool down through a liquid cooling runner 21, each battery core 90's temperature homogeneity has not only been guaranteed, and the difference in temperature between each battery core 90 has been reduced, the homogeneity of the temperature of whole battery module has been guaranteed, battery module wholeness can be promoted.

Wherein, at least two liquid cooling runners 21 are mirror symmetric to improve the same heat dissipation coefficient of each liquid cooling runner 21, which is beneficial to the heat dissipation uniformity of the battery core 90. In this embodiment, four liquid cooling channels 21 are provided, and two liquid cooling channels 21 are arranged in a group, and two liquid cooling channels 21 are in mirror symmetry.

Optionally, the upper cover plate and the lower cover plate are both provided with flow channel grooves, and when the upper cover plate is in butt joint with the lower cover plate, the upper flow channel groove and the lower flow channel groove are in butt joint to form a liquid cooling flow channel 21.

Optionally, the upper cover plate can be a flat plate, and the preset plane is parallel to the upper cover plate. Thus, the liquid cooling flow passage 21 does not occupy an external space, and downward contact with the battery core 90 is facilitated.

Wherein, a plurality of liquid cooling runner can link as an organic whole, also can separate each other and link to each other with the upper cover plate respectively. In the present embodiment, the flow channel groove is formed by punching.

In order to realize the positioning of the position of the liquid cooling flow passage 21 and to ensure that the liquid cooling flow passage 21 is always located on the predetermined plane, the liquid cooling cover 20 has a mounting portion 22, the mounting portion 22 is annularly disposed on the liquid cooling flow passage 21, and the mounting portion 22 is in a flat plate shape.

The battery pack shell further comprises a sealing bolt 30 used for connecting the upper cover plate and the lower cover plate, the sealing bolt 30 penetrates through the middle of the lower cover plate and the middle of the upper cover plate and can lock the lower cover plate on the upper cover plate to form a middle hanging point of the upper cover plate, and the possibility that the lower cover plate at the position corresponding to the middle of the upper cover plate sinks under the action of gravity and is separated from the upper cover plate is reduced.

Alternatively, the bottom plate 12 may be made of a material that is lighter in weight and meets ball impact requirements to reduce the overall weight of the battery pack housing and further improve the safety of a bottom ball impact. The material of the bottom plate 12 may be a metal material or a composite material. The frame 11 may be integrally formed with the bottom plate 12, or may be fixedly connected to the bottom plate 12 by welding, screwing, or the like. In the present embodiment, the bottom plate 12 and the frame are made of aluminum alloy, the material of the bottom plate 12 is a composite material made by Resin Transfer Molding (RTM), and the bottom plate 120 and the frame 11 are bonded and then fixedly connected by friction stir welding to ensure the sealing property between the bottom plate 12 and the frame.

Referring to fig. 3, a plurality of battery cores 90 may be mounted in the lower case 10 to form a battery module, and the plurality of battery cores 90 are all located in the receiving groove 101 and are located on the same plane. In order to realize the isolation and installation of the plurality of battery cores 90, the lower shell 10 further comprises at least one cross beam 13 and at least one longitudinal beam 14, the cross beam 13 and the longitudinal beam 14 are both located in the accommodating groove 101 and are connected to the frame 11, the cross beam 13 and the longitudinal beam 14 have different extending directions and are mutually crossed, the accommodating groove 101 can be divided into a plurality of installation spaces by the cross beam 13 and the longitudinal beam 14, each installation space can accommodate one battery core 90, and the battery cores 90 can be connected through the cross beam 13 and the longitudinal beam 14. In the present embodiment, one cross beam 13 and one longitudinal beam 14 are disposed in the accommodating groove 101, the cross beam 13 and the longitudinal beam 14 can divide the accommodating groove 101 into four mounting spaces, and the four battery cores 90 are respectively mounted in one mounting space. In other embodiments, the number of the cross beams 13 and the longitudinal beams 14 can be more than one.

At this time, the liquid cooling cover 20 is connected to the frame 11, the cross beam 13 and the longitudinal beam 14, and specifically, the lower cover plate is connected to all of the frame 11, the cross beam 13 and the longitudinal beam 14.

Referring to fig. 3, in order to reduce the influence of the temperature of the external environment on the battery module, the battery pack case further includes heat insulation fireproof cotton 51 disposed on a side of the upper cover plate away from the receiving groove 101, sealing foam 54 disposed between the upper cover plate and the frame 11, heat insulation cotton 55 disposed on the bottom plate 12, and convection foam 52 connected between the liquid cooling cover 20 and the heat insulation fireproof cotton 51. Wherein, thermal-insulated fire prevention cotton 51 can be in an organic whole with upper cover plate fixed connection to be used for the fire prevention thermal-insulated, reduce outside temperature variation and influence battery core 90. The sealing foam 54 is used to seal the gap between the liquid cooling cover 20 and the frame 11 so that the battery core 90 is in a sealed environment. The heat preservation cotton 55 is located between the bottom plate 12 and the battery core 90, and also has a heat preservation effect, so that the influence of the temperature below the battery pack shell on the battery core 90 through the bottom plate 12 is reduced. The convection bubble cotton 50 is sealed in the gap between the heat insulation fireproof cotton 51 and the liquid cooling cover 20 in a strip shape, so that the convection between the hot air between the liquid cooling cover 20 and the heat insulation fireproof cotton 51 and the cold air outside is reduced, and the heat preservation effect is further achieved.

In this embodiment, the battery pack housing also includes a high voltage protection distribution box 15 connected above the liquid cooled lid 20. The high-voltage protection distribution box 15 is an important protection module of a high-voltage circuit system of the electric vehicle, and is used for coordinating and driving function conversion and energy distribution of high-voltage buildings such as a battery management system, a charging management system and the like, and can also realize safety protection functions such as short-circuit overload rapid power-off protection, anti-creeping protection and the like.

Referring to fig. 1, in order to electrically connect the battery core 90 to an external power utilization structure, the battery pack case further includes at least one socket 40 connected to the lower case and capable of electrically connecting the battery core 90, and the socket is used for electrically connecting the battery core 90 to the external power utilization structure. When the battery pack case with the battery core 90 is installed in the electric vehicle, the electric structure in the electric vehicle is electrically connected with the battery core 90 through the plugging and matching with the plugging seat 40. In this embodiment, two sockets 40 are provided for connecting the high-voltage plug and the low-voltage plug respectively, so as to improve the applicability of the battery pack.

The embodiment of the utility model also provides a battery pack, which comprises a battery core body 90 and the battery pack shell provided by each embodiment. The battery pack case has the same structural features as the battery pack cases in the above embodiments, and functions thereof are the same, which are not described herein again. This battery package is realizing the lightweight through reducing bearing structure to when reduce cost promoted product competition advantage, still further reduced whole height, improved energy density and the inside space utilization of electric automobile, promoted the security of bottom ball hit.

The foregoing is considered as illustrative only of the preferred embodiments of the utility model, and is presented merely for purposes of illustration and description of the principles of the utility model and is not intended to limit the scope of the utility model in any way. Any modifications, equivalents and improvements made within the spirit and principles of the utility model and other embodiments of the utility model without the creative effort of those skilled in the art are included in the protection scope of the utility model based on the explanation here.

Claims

1. A battery pack housing, comprising:

2. The battery pack housing of claim 1, wherein at least two of said liquid cooling flow passages are mirror images.

3. The battery pack case of claim 1, wherein the lower case comprises a frame and a bottom plate connected to the frame, the frame and the bottom plate together define the receiving groove, the frame is used for connecting the battery cores, and the bottom plate is spaced apart from the battery cores connected to the frame.

4. The battery pack case of claim 3, wherein the bottom housing further comprises at least one cross member and at least one longitudinal member, the cross member and the longitudinal member are connected to a frame and intersect each other, the cross member and the longitudinal member divide the receiving cavity into a plurality of receiving spaces, each receiving space is capable of receiving one of the battery cores, and the liquid cooling cover is connected to the frame, the cross member and the longitudinal member.

5. The battery pack case of claim 3, further comprising thermal insulation and fire protection cotton disposed on a side of the liquid cooling cover facing away from the receiving cavity, a thermal conductive pad disposed on the battery core, sealing foam disposed between the liquid cooling cover and the frame, and insulation cotton disposed on the bottom plate.

6. The battery pack case of claim 5, further comprising convective cell foam coupled between the liquid cooled lid and the thermally insulating and fire-proof foam.

7. The battery pack housing of claim 1, further comprising a high voltage protection distribution box connected above the liquid cooling lid.

8. The battery pack housing of claim 1, further comprising at least one socket connected to the lower housing and capable of electrically connecting to the battery core, the socket for electrically connecting the battery core to an external power structure.

9. The battery pack housing of claim 1, further comprising a sealing bolt for connecting the upper cover plate to the liquid-cooled cover.

10. A battery pack comprising a battery core and a battery pack case according to any one of claims 1 to 9.