CN216054847U

CN216054847U - Battery pack and vehicle

Info

Publication number: CN216054847U
Application number: CN202122343529.1U
Authority: CN
Inventors: 凌和平; 黄伟; 熊永; 刁义伟; 许巍
Original assignee: BYD Co Ltd
Current assignee: Changzhou Byd Automobile Co ltd; BYD Co Ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2022-03-15
Anticipated expiration: 2031-09-26

Abstract

The application discloses battery package and vehicle. The battery pack includes: the refrigerator comprises a refrigerator body, a storage box and a control device, wherein at least one containing cavity is formed in the refrigerator body and extends along a first direction; the at least one electric core group is correspondingly arranged inside the at least one accommodating cavity, the length direction of each electric core group extends along the first direction, and each electric core group is provided with a first surface and a second surface which are opposite to each other in the second direction; wherein, the first direction refers to the length direction of the box body, and the second direction refers to the width direction of the box body; the heat management flow channel is arranged in the accommodating cavity and used for cooling or heating the first surface and the second surface. The length direction of this application electric core group extends along the length direction of box, has effectively increased the heat transfer area of electric core group, and the heat management runner has improved heating and cooling efficiency to the big face heating or the cooling of electric core group, is favorable to guaranteeing that the battery package normally works.

Description

Battery pack and vehicle

Technical Field

The utility model relates to the technical field of new energy, in particular to a battery pack and a vehicle.

Background

With the popularization of new energy vehicles, lithium battery new energy vehicles are more and more commonly used, and a large number of single lithium ion batteries are generally connected in series and in parallel to form a large battery pack. The traditional battery pack adopts a structure that the battery module is arranged in a box body of the battery pack to form the battery pack. The upper cover and the bottom plate of the existing battery pack box body are oppositely arranged in the first direction (the height direction of the box body), a structural beam is arranged between the upper cover and the bottom plate, the structural beam separates the interior of the box body into a plurality of containing cavities, a pole core string is arranged in each containing cavity and comprises a plurality of pole core groups which are sequentially arranged along the second direction and are connected in series, the pole core groups are packaged in a packaging film, and the length direction of the pole core string extends along the second direction (the width direction of the box body).

However, the existing battery is provided with the pole core string in the accommodating cavity formed in the height direction of the upper cover and the bottom plate, so that the battery cell is densely arranged in a small space in groups, the battery cell is high in placement density, the heat exchange area of the battery cell is small, the battery cell can not dissipate heat, the effect of heating the battery cell at a low temperature is poor, and the normal use of the battery pack is influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned drawbacks and deficiencies of the prior art, it would be desirable to provide a battery pack and a vehicle that are simple in process, space-saving, and have good heating and cooling effects.

In a first aspect, the present application provides a battery pack, comprising:

the refrigerator comprises a refrigerator body, a storage box and a control device, wherein at least one containing cavity is formed in the refrigerator body and extends along a first direction;

the at least one electric core group is correspondingly arranged inside the at least one accommodating cavity, the length direction of each electric core group extends along the first direction, and each electric core group is provided with a first surface and a second surface which are opposite to each other in the second direction; wherein, the first direction refers to the length direction of the box body, and the second direction refers to the width direction of the box body;

the heat management flow channel is arranged in the accommodating cavity and used for cooling or heating the first surface and the second surface.

Alternatively, the receiving cavity and the thermal management runner are integrally extruded on the housing.

As an optional scheme, the heat management flow channel is provided with a first flow channel and a second flow channel which are independent of each other, the first flow channel and the second flow channel respectively extend along a third direction, the first flow channel and the second flow channel are respectively communicated in the first direction, a heat exchange medium located in the first flow channel can cool or heat the first surface and the second surface of each electric core group, and a heat exchange medium located in the second flow channel can cool or heat the first surface and the second surface of each electric core group; the third direction is the thickness direction of the box body

Alternatively, the first flow channels and the second flow channels have a single-row lattice shape in cross section along the third direction.

As an optional scheme, a plurality of partition plates are formed inside the box body, extend along the first direction and are arranged in parallel at intervals in the second direction, and an accommodating cavity is defined between every two adjacent partition plates.

As an alternative, each partition plate is provided with a first cavity and a second cavity which are independent, the first cavity and the second cavity respectively extend along the first direction, the first cavities on two adjacent partition plates are communicated with each other, the second cavities on two adjacent partition plates are communicated with each other, heat exchange media are respectively filled in the first cavity and the second cavity, and each partition plate is configured as a heat management flow channel.

As an optional scheme, the number of the electric core groups is at least two, the partition plate located at the middle most among the partition plates is marked as a middle partition plate, the partition plates located at two sides of the middle partition plate among the remaining partition plates are respectively marked as a first partition plate and a second partition plate, and the middle partition plate, at least one first partition plate and at least one second partition plate are provided with flow dividing joints, wherein the flow dividing joints are used for dividing the heat exchange medium inside the middle partition plate to each first partition plate and each second partition plate and enabling the heat exchange medium in the first cavity to flow back to the second cavity.

Optionally, the flow splitting joint comprises at least two of a tee joint, a multi-pass joint, a double-pass joint, or a vertical-pass joint.

As an optional scheme, one end of the middle partition plate is provided with an inlet and an outlet, the other end of the middle partition plate is connected with a three-way joint, the three-way joint is respectively connected with a first-position partition plate and a second-position partition plate, the rest of the first-position partition plates are sequentially connected in series through a two-way joint, the rest of the second-position partition plates are sequentially connected in series through a two-way joint, and free ends of the first-position partition plate positioned on the outermost side and the second-position partition plate positioned on the outermost side are respectively connected with a first vertical joint so as to enable heat exchange media in the first cavity to flow back into the second cavity and be discharged from the outlet; one of the inlet and the outlet is positioned in the area of the middle partition plate communicated with the first cavity, and the other inlet and the outlet is positioned in the area of the middle partition plate communicated with the second cavity.

As an optional scheme, a liquid inlet and a liquid outlet are formed at one end of the middle partition plate, one end of the middle partition plate is further connected with a multi-way joint, the multi-way joint is communicated with the liquid inlet, the liquid outlet, one end of the first partition plate and one end of the second partition plate respectively so that a heat exchange medium flows in parallel among the middle partition plate, the first partition plate and the second partition plate, and the other end of the middle partition plate, the other end of the first partition plate and the other end of the second partition plate are respectively connected with a second vertical joint so that the heat exchange medium in the first cavity flows back to the second cavity and is discharged from the liquid outlet; one of the liquid inlet and the liquid outlet is positioned in an area of the middle partition plate communicated with the first cavity, and the other one of the liquid inlet and the liquid outlet is positioned in an area of the middle partition plate communicated with the second cavity.

As an alternative, the electric core group located in the same accommodating cavity comprises a plurality of pole core strings connected in series, and the first pole core group of one pole core string in two adjacent pole core strings is electrically connected with the first pole core group of the other pole core string.

Alternatively, each of the electric core groups comprises a first electrode lead-out part and a second electrode lead-out part for leading out electric current, and the first electrode lead-out part of one electric core group in two adjacent electric core groups is electrically connected with the second electrode lead-out part of the other electric core group.

In a second aspect, the present application provides a vehicle including the battery pack of the first aspect.

The utility model provides a battery pack, form through the length direction at the box and hold the chamber, and the length direction of electric core group extends along the length direction of box, the height of the direction of height of battery pack has effectively been reduced, and the heat transfer area of electric core group has been increased, the thermal management runner sets up along the length direction of box, and electric core group closely laminates with the thermal management runner on two surfaces of box width direction, can heat or cool off the big face of electric core group, heating and cooling efficiency have been improved, be favorable to guaranteeing that battery pack normally works.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 is a schematic view (with one end open) of an external structure of a battery pack according to an embodiment of the present invention;

fig. 2 is a view showing the installation of the electric core pack in the battery pack according to the embodiment of the present invention (with one end open);

fig. 3 is a front view of a battery pack in a first orientation in accordance with an embodiment of the present invention;

fig. 4 is a rear view of a battery pack in a first orientation in accordance with an embodiment of the present invention;

fig. 5 is a schematic structural view of a battery pack case according to an embodiment of the present invention (without assembling the electric core pack);

FIG. 6 is a front view of FIG. 5 in a first orientation;

fig. 7 is a schematic structural diagram of a heat management flow channel in a battery pack according to an embodiment of the utility model (direct cooling and direct heating);

fig. 8 is a schematic structural diagram of a heat management flow channel in a battery pack according to an embodiment of the utility model (liquid-cooled liquid-heated);

fig. 9 is a schematic view of an electric core assembly in a battery pack according to an embodiment of the utility model.

Fig. 10 is a schematic diagram illustrating a series connection of electric core sets in a battery pack according to an embodiment of the utility model.

In the figure, the position of the upper end of the main shaft,

1. the battery pack comprises a box body, 101, an upper cover, 102, side plates, 103, a bottom plate, 104, lifting lugs, 11, an accommodating cavity, 12, partition plates, 121, a middle partition plate, 122, a first partition plate, 123, a second partition plate, 2, a battery core group, 21, a first surface and 22, a second surface; 3. a thermal management flow passage, 31, a first flow passage, 32, a second flow passage; the three-way joint, 42, the two-way joint, 43, the first vertical joint, 44, the multiple-way joint and 45, the second vertical joint.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

In a first aspect, embodiments of the present application provide a battery pack, as shown in fig. 1 to 10, including:

the box body 1 is provided with at least one accommodating cavity 11 formed inside the box body 1, and the at least one accommodating cavity 11 extends along a first direction;

at least one electric core group 2, wherein the at least one electric core group 2 is correspondingly arranged inside the at least one accommodating cavity 11, the length direction of each electric core group 2 extends along the first direction, and each electric core group 2 is provided with a first surface 21 and a second surface 22 which are opposite in the second direction; wherein, the first direction refers to the length direction of the box body 1, and the second direction refers to the width direction of the box body 1;

and the heat management flow channel 3 is arranged in the accommodating cavity 11, and the heat management flow channel 3 is used for cooling or heating the first surface and the second surface.

It can be understood that the box body 1 can be roughly configured into a cuboid shape and is mainly used for coating the electric core group 2 and the heat management runner 3; in a specific implementation, the box body generally comprises an upper cover 101, a side plate 102 and a bottom plate 103, wherein an installation space is defined by the upper cover 101, the side plate 102 and the bottom plate 103 for installing the electric core group 2 and the thermal management flow channel 3; in other embodiments, of course, the lifting lugs 104 are further formed on two opposite sides of the exterior of the box body 1, and two diagonal reinforcing ribs are respectively arranged on two sides of the lifting lug 104 in the second direction, so that the rigidity of the frame of the box body 1 is enhanced, and the box body is better used for matching and connecting a battery pack with a vehicle.

As a preferred embodiment, the accommodating cavity 11 and the thermal management runner 3 can be integrally formed on the box body 1 by extrusion, which is beneficial to omitting connecting members and connecting processes such as installation welding and screw connection, and has the advantages of simple processing, space saving and cost saving.

In actual processing, hold chamber 11 and the integrative extrusion of thermal management runner 3 on box 1, for the installation of convenient electric core group 2, the at least one end opening of the length direction of box 1 for installation electric core group 2, with electric core group 2 installation into hold chamber 11 after, use aluminum plate welded seal to the tip opening of box 1 again, compare prior art and simplified the processing technology of whole battery package.

The accommodating cavity 11 extends along the first direction of the box body 1 (namely the length direction of the box body 1), so that the installation space of the electric core group 2 is increased, the heat exchange area of the electric core group is increased, and the heating and refrigerating effects are improved; the number of the accommodating cavities 11 can be one, two or more, correspondingly, the number of the electric core groups 2 can be one, two or more, and each electric core group 2 is correspondingly arranged inside one accommodating cavity 11.

It can also be understood that, since the battery pack is very easily affected by the ambient temperature and the heat generated by the battery pack during use, for example, the battery pack may not be normally used when the external temperature is low, and at this time, the battery pack needs to be heated to be at an appropriate temperature for normal operation; for another example, the battery pack itself may generate heat or the external environment temperature is high during normal operation (during charging or discharging), and if the battery pack is not cooled in time, unsafe accidents may occur; therefore, thermal management runner 3 sets up along first direction, is favorable to directly cooling or heating the first face 21 and the second face 22 of electric core group 2, is favorable to in time adjusting battery module's temperature, heats or refrigerates battery module under appropriate circumstances, guarantees battery module's normal work. The electric core group 2 has a first face and a second face opposite to each other in a second direction (i.e. in the width direction of the box), and because the length direction of the electric core group extends along the first direction, in practical processing, when the electric core group 21 is installed inside the accommodating cavity 11, the first face 21 and the second face 22 of the electric core group 21 face the width direction of the box instead of the thickness direction, and therefore the first face 21 and the second face 22 serve as large faces of the electric core group, so that the heat exchange area of the electric core group 2 is large, and the heat management flow channel 3 cools or heats the first face 21 and the second face 22, which is beneficial to improving the heat exchange efficiency;

the heat management flow channels 3 are arranged in the accommodating cavities 11, and when two or more accommodating cavities 11 are arranged, each accommodating cavity 11 is provided with a heat management flow channel 3; in a particular embodiment, the thermal management flow channel 3 may be a plurality of partitions forming the inside of the case 1, each defining a housing cavity 11 therebetween; of course, the thermal management flow channel 3 may also be a pipeline of other forms, and is arranged inside each accommodating cavity 11 in an S-shape, and this embodiment of the present application does not limit this, as long as the heating or cooling of the electric core assembly 2 can be realized.

To sum up, the battery pack of this application embodiment, the heat transfer area of electric core in having solved current battery pack is less, make electric core generate heat unable heat dissipation, simultaneously the poor problem of effect to electric core heating at low temperature, this application embodiment holds the chamber through the length direction formation at the box, and the length direction of electric core group extends along the length direction of box, the direction of height of battery pack has effectively been reduced, and the heat transfer area of electric core group has been increased, the thermal management runner sets up along the length direction of box, and electric core group closely laminates with thermal management runner on two surfaces of box width direction, can heat or cool off the big face of electric core group, heating and cooling efficiency have been improved, be favorable to guaranteeing battery pack normal work.

As a realizable mode, as shown in fig. 2, a plurality of containing cavities 11 are formed inside the box body 1, the number of the electric core sets 2 corresponds to that of the containing cavities 11, and one electric core set 2 is correspondingly installed in each containing cavity 11. This embodiment is favorable to in-service use, according to the requirement of performance parameters such as the space of vehicle, continuation of the journey mileage, increases or subtracts holding chamber 11 and electric core group 2, is favorable to satisfying the demand of vehicle, has improved the suitability of battery package.

As a realizable manner, the heat management flow channel 3 is provided with a first flow channel 31 and a second flow channel 32 which are independent from each other, the first flow channel 31 and the second flow channel 32 respectively extend along the third direction, the first flow channel 31 and the second flow channel 32 respectively penetrate in the first direction, the heat exchange medium in the first flow channel 31 can heat or cool the first surface 21 and the second surface 22 of each electric core group 2, and the heat exchange medium in the second flow channel 32 can heat or cool the first surface 21 and the second surface 22 of each electric core group 2; wherein the third direction is a thickness direction of the case 1.

It is understood that the third direction refers to the thickness direction of the box body 1, the first flow channel 31 can also be called an upper flow channel, and correspondingly, the second flow channel 32 can be called a lower flow channel; namely, the thermal management flow channel is divided into an upper part and a lower part, which is beneficial to ensuring that the thermal management flow channel can effectively heat or cool each electric core group 2, and meanwhile, the heat exchange medium in the thermal management flow channel can realize reflux.

As a preferred embodiment, the cross-section of the first flow channels 31 and the second flow channels 32 along the third direction has a single-row lattice shape. The single-row lattice is only one row in the third direction and has multiple rows of lattices, for example, in a "day" shape or a "mesh" shape.

This embodiment is favorable to guaranteeing that heat exchange medium pressure is even in first runner 31 and second runner 32, and then promotes heat exchange efficiency.

As a practical way, as shown in fig. 5 and 6, a plurality of partition plates 12 are formed inside the box body 1, the plurality of partition plates 12 extend along the first direction and are arranged in parallel at intervals in the second direction, and the accommodating chamber 11 is defined between two adjacent partition plates 12.

Wherein, the box body 1 and the clapboard 12 are integrally extruded and formed, and the parts fixed by welding or the assembly process are not required to be separately assembled, thereby saving the space and the cost.

A plurality of baffles 12 set up along the length direction interval of box 1, and are parallel to each other and arrange, have increased the space that holds chamber 11, are favorable to easy to assemble electric core group 2, increase electric core group 2's heat transfer area.

It can be understood that baffle 12 inject the chamber that holds that can place electric core group 2, saves current electric core group and electric core group between the fixed structure, is favorable to saving space and cost, and box 1 is inside to be formed with baffle 12 simultaneously, is favorable to improving box 1's bulk strength, avoids receiving outside extrusion deformation, is favorable to guaranteeing the normal work of battery package.

As a practical way, each partition plate 12 has a first cavity and a second cavity, which are independent, and the first cavity and the second cavity respectively extend along a first direction, the first cavities of two adjacent partition plates 12 are communicated with each other, the second cavities of two adjacent partition plates 12 are communicated with each other, the first cavities and the second cavities are respectively filled with a heat exchange medium, and each partition plate 12 is configured as a heat management flow passage 3.

It should be noted that the cross section of the first cavity and the second cavity may be any shape, such as a square, a circle, a triangle, etc., and any regular or irregular shape; of course, the cross-section of the first and second cavities may also be in the form of a single grid as described above, for example, a "herringbone" shape.

It can be understood that the partition boards 12 are formed with a first cavity and a second cavity in the height direction of the box body 1, the first cavity and the second cavity are independent of each other, which means that the first cavity and the second cavity on each partition board 12 are not communicated, so that the first cavities on two adjacent partition boards 12 are communicated with each other to form a first flow channel 31, and the second cavities on two adjacent partition boards 12 are communicated with each other to form a second flow channel 32, so that the partition boards 12 are configured as a thermal management flow channel 3, and since the partition boards 12 extend along the first direction and are consistent with the length direction of the electric core group 2, reliable heating or cooling of the first surface and the second surface of the electric core group 2 is facilitated, and meanwhile, other components do not need to be additionally arranged as the thermal management flow channel, which is beneficial to saving space.

The heat exchange medium can be any refrigerant, and direct cooling and direct heating can be realized through gas-liquid conversion, such as chlorofluorocarbon; the heat exchange medium may also be any cooling fluid, such as cooling water.

As a realizable mode, as shown in fig. 7 and 8, the number of the electric core groups 2 is at least two, the most middle partition plate in the partition plates 12 is referred to as a middle partition plate 121, the partition plates 12 on two sides of the middle partition plate 121 in the rest of the partition plates 12 are referred to as a first partition plate 122 and a second partition plate 123 respectively, and the middle partition plate 121, at least one first partition plate 122 and at least one second partition plate 123 are provided with flow dividing joints, which are used for dividing the heat exchange medium inside the middle partition plate 121 to each first partition plate 122 and each second partition plate 123 and enabling the heat exchange medium in the first cavity to flow back to the second cavity.

It can be understood that the middle partition 121 is a partition located at the center of the box 1, the first partition 122 is a partition located at the left side of the middle partition 121, and the second partition 123 is a partition located at the right side of the middle partition 121;

in this embodiment, the plurality of partition plates 12 are connected by the flow dividing joints, which is beneficial to the flow of the heat exchange medium in the first and second cavities on the partition plates 12, so as to form the first flow channel 31 and the second flow channel 32, thereby ensuring reliable heating and cooling of the electric core assembly 2. And, the reposition of redundant personnel connects is used for shunting the inside heat exchange medium of median septum 121 to every first baffle 122 and every second baffle 123, only needs to set up the entry and the export of a heat exchange medium, and processing is simple, saves technology, and the heat of guaranteeing simultaneously to flow through first face 21 and the second face 22 of every electric core group 2 is even, and then guarantees that the heat of whole electric core group 2 is balanced, is favorable to guaranteeing the normal work of battery package.

As an implementable manner, the flow dividing joint includes at least two of a three-way joint 41, a multi-way joint 44, a two-way joint 42, or a vertical joint. The vertical joint can be understood as one of two-way joints, and in the embodiment of the present application, the vertical joint means that the first cavity and the second cavity on the partition plate 12 are communicated in the third direction of the box body 1. The vertical joints comprise a first vertical joint 43 and a second vertical joint 45.

As an implementation manner, the heat exchange medium is a refrigerant, as shown in fig. 7, one end of the middle partition plate 121 is provided with a refrigerant inlet a1 and a refrigerant outlet a2, the other end is connected with a three-way joint 41, the three-way joint 41 is respectively connected with one first partition plate 122 and one second partition plate 123, the rest first partition plates 122 are sequentially connected in series through the two-way joint 42, the rest second partition plates 123 are sequentially connected in series through the two-way joint 42, and free ends of the first partition plate 122 located at the outermost side and the second partition plate 123 located at the outermost side are respectively connected with a first vertical joint 43, so that the refrigerant in the first cavity flows back into the second cavity and is discharged from the refrigerant outlet a 2; one of the refrigerant inlet a1 and the refrigerant outlet a2 is located in a region of the middle partition plate 121 communicating with the first cavity, and the other is located in a region of the middle partition plate 121 communicating with the second cavity.

It can be understood that the middle partition plate 121 divides the refrigerant entering the middle partition plate 121 from the refrigerant inlet a1 into the partition plates at the left and right sides through the three-way joint 41, and since the rest of the first partition plates 122 are sequentially connected in series through the two-way joint 42 and the rest of the second partition plates 123 are sequentially connected in series through the two-way joint 42, the refrigerant flows in the first partition plate 122 and the second partition plate 123 at the two sides of the middle partition plate 121 in an S-shape.

It should be noted that, the other first-position partition plates 122 are sequentially connected in series through the double-way joint 42, and the other second-position partition plates 123 are sequentially connected in series through the double-way joint 42 means that the head end of one partition plate in two adjacent partition plates in each of the first-position partition plates 122 and the second-position partition plates 123 is connected with the tail end of the other partition plate; the head end refers to the end of each partition plate located at the front side in the refrigerant flow path, and the tail end refers to the end of each partition plate located at the rear side in the refrigerant flow path. Thus, the first flow channel 31 and the second flow channel 32 are formed in an S shape;

wherein, the first position partition plate 122 positioned at the outermost side means the first position partition plate 122 farthest from the middle position partition plate 121, and the free end of the second position partition plate 123 positioned at the outermost side means the second position partition plate 123 farthest from the middle position partition plate 121;

the following description will be made by taking the refrigerant inlet a1 located in the area of the middle partition plate 121 communicating with the first cavity and the refrigerant outlet a2 located in the area of the middle partition plate 121 communicating with the second cavity as an example:

it can be understood that the free end of the outermost first partition 122 and the free end of the outermost second partition 123, that is, the end of the outermost first partition 122 and the end of the outermost second partition 123, the first vertical joint 43 facilitates to guide the refrigerant in the first cavity of the outermost first partition 122 to the second cavity, and to guide the refrigerant in the first cavity of the outermost second partition 123 to the second cavity, and finally flows back to the second cavity of the middle partition 121 under the action of the two-way joint 42 and the three-way joint 41, so that the refrigerant is finally discharged from the refrigerant outlet a2 on the middle partition 121, that is, the communication between the first flow passage 31 and the second flow passage 32 is realized.

In this embodiment, the S-shaped first flow channel and the S-shaped second flow channel are formed, and the first flow channel and the second flow channel are communicated with each other, which is determined according to the heat exchange characteristics of direct cooling and direct heating of the refrigerant, and is beneficial to the uniformity of the heat exchange stroke of the refrigerant in the first flow channel and the second flow channel.

For example, the refrigerant inlet a1 is located in a region of the middle partition plate 121 communicating with the first cavity, and the refrigerant outlet a2 is located in a region of the middle partition plate 121 communicating with the second cavity, where the heat exchange amount is the largest when the refrigerant enters the first cavity of the middle partition plate 121, and the refrigerant finally flows to the second cavity of the middle partition plate 121 through the respective first partition plate 122 and the second partition plate 123, and at this time, the heat exchange amount in the second cavity of the middle partition plate 121 is the smallest, and the heat can be uniformly diffused over the entire partition plate, so that the entire partition plate is uniform. The first cavity and the second cavity of the middle partition plate 121 are the coldest and hottest mixture, the first cavity and the second cavity of the first partition plate 122 located on one side of the middle partition plate 121 towards the two sides are the secondary cold and secondary hot mixture, the first cavity and the second cavity of the first partition plate 122 located on the two sides are the secondary cold and secondary hot mixture, and the like; similarly, the first and second cavities of the second position partition plate 123 located at the other side of the middle position partition plate 121 are the same as the first position partition plate 122. The heat exchange quantity of each mixed clapboard is more or less, and the temperature uniformity of the electric core group is ensured.

As a realizable manner, the heat exchange medium is cooling water, as shown in fig. 8, one end of the middle partition plate 122 is formed with a water inlet b1 and a water outlet b2, and one end of the middle partition plate 122 is further connected with a multi-way joint 44, the multi-way joint 44 is respectively communicated with one end of the water inlet b1, the water outlet b2, the first partition plate 122 and one end of the second partition plate 123, so that the cooling water flows in parallel among the middle partition plate 121, the first partition plate 122 and the second partition plate 123, and the other end of the middle partition plate 121, the other end of the first partition plate 122 and the other end of the second partition plate 123 are respectively connected with a second vertical joint 45, so that the cooling water in the first cavity flows back into the second cavity and is discharged from the water outlet b 2; one of the water inlet b1 and the water outlet b2 is located in the area of the middle partition plate 121 communicated with the first cavity, and the other is located in the area of the middle partition plate 121 communicated with the second cavity.

Illustratively, the water inlet b1 is located in a region of the middle partition 121 communicating with the first cavity, and the water outlet b2 is located in a region of the middle partition 121 communicating with the second cavity; after entering the first cavity of the middle partition plate 121 from the water inlet b1 of the middle partition plate 121, the cooling water is uniformly divided into the first cavity of the first partition plate 122 and the first cavity of the second partition plate 123 by the multi-way joint 44, then flows back to the respective second cavities through the second vertical joints 45 on the middle partition plate 121, the first partition plate 122 and the second partition plate 123, and finally is discharged from the water outlet b2 on the middle partition plate 121. The embodiment realizes uniform cooling water diversion and short circulation path, improves the heat exchange rate and reduces the pressure of the cooling liquid.

As a practical way, the electric core groups 2 in the same containing cavity 11 comprise a plurality of pole core strings connected in series, and the first pole core group of one pole core string in two adjacent pole core strings is electrically connected with the first pole core group of the other pole core string. Wherein, every electric core group 2 rubber coating back encapsulation that holds chamber 11 holds the chamber 11 inside, and this embodiment can practice thrift the wiring space of connecting wire.

It can be understood that the electric core group 2 needs to be installed in the accommodating cavity 11 of the box body 1, so that one end of the box body 1 in the length direction is open, and therefore, the first pole core group of each pole core string refers to one pole core group which is located at the open end of the box body 1 after the electric core group 2 is placed inside the accommodating cavity 11.

As a realizable way, each electric core group 2 comprises a first electrode leading-out part and a second electrode leading-out part for leading out electric current, and the first electrode leading-out part of one electric core group in two adjacent electric core groups 2 is electrically connected with the second electrode leading-out part of the other electric core group 2. Two liang of series connections between two adjacent electric core groups, connection structure is simple for whole battery package becomes a whole, is favorable to promoting the mode and the torsional strength of battery package, and space utilization is high.

Illustratively, as shown in fig. 9 and 10, the electric core group located in the same accommodating cavity 11 includes four series-connected pole core strings: the first pole core string comprises a pole core group I, a pole core group I and a pole core group III which are sequentially connected in series; the second pole core string comprises a pole core group IV, a pole core group V and a pole core group VI which are sequentially connected in series; the third pole core string comprises a pole core group VII, a pole core group VIII and a pole core group IX which are sequentially connected in series; the fourth pole core string comprises a pole core group X, a pole core group XI and a pole core group XII which are sequentially connected in series; in actual processing, in order to simplify processing and facilitate installation of the electric core group, because one end of the box body 1 is opened, before the electric core group is installed inside the accommodating cavity 11, two adjacent polar core strings, namely a polar core group III of a first polar core string and a polar core group IV of a second polar core string, are connected in series to form a polar core string I, wherein the first polar core group of the polar core string I is a polar core group I and a polar core group VI; a pole core group IX of the third pole core string and a pole core group X of the fourth pole core string are connected in series to form a pole core string ii, wherein the first pole core group of the pole core string ii is a pole core group VII and a pole core group XII; so, after utmost point core cluster I and utmost point core cluster ii put into same chamber 11 that holds respectively, with utmost point core group VI and utmost point core group VII connection, utmost point core group I is used for concatenating with adjacent electric core group 2, utmost point core group XII is used for concatenating with adjacent electric core group 2, so, the same utmost point core cluster that holds in chamber 11 among the electric core group 2 concatenates, is located two adjacent electric core groups 2 that hold in chamber 11 and concatenates.

In order to facilitate the serial connection and routing of the two adjacent cell groups 2, the two adjacent partition plates 12 are provided with notches at the two side edges of the box body in the height direction, and the notches can be machined and milled on the partition plates 12 for the second time after the partition plates 12 are extruded and formed, so that the routing space is provided, and the overall structure of the battery pack is ensured to be compact.

In summary, the battery pack of the present application has the following advantages:

the box body is integrally extruded and molded, and a heat management flow channel and an accommodating cavity are formed, so that a connecting structural member such as installation welding and the like and a connecting process are omitted, the space is saved, and the cost can be saved;

the partition board defines an accommodating cavity for installing the electric core groups, and the two adjacent electric core groups are connected in series, so that a structure for fixing the electric core groups is omitted, and space and cost are saved;

the heat management runner is formed by integrally extruding the partition boards, and can be used for carrying out double-sided heating and cooling on the large surface of the electric core group, so that not only is space saved, but also the heat exchange efficiency can be improved, and the strength of the whole battery box body can be improved.

The baffle forms the tubular runner of mouth organ, and the runner can general liquid cold liquid heat and direct cold directly heat, can change the cooling form in a flexible way through the diffluent joint of different forms of adaptation.

In a second aspect, embodiments of the present application provide a vehicle including the battery pack described above. The vehicle of the embodiment may be an electric vehicle, a hybrid vehicle, or the like. Those skilled in the art will appreciate that the vehicle has all of the features and advantages of the battery pack previously described herein and will not be redundantly described here.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. A battery pack, comprising:

the refrigerator comprises a refrigerator body, a first cover and a second cover, wherein at least one accommodating cavity is formed in the refrigerator body and extends along a first direction;

the at least one electric core group is correspondingly arranged inside the at least one accommodating cavity, the length direction of each electric core group extends along the first direction, and each electric core group is provided with a first face and a second face which are opposite in the second direction; wherein the first direction refers to the length direction of the box body, and the second direction refers to the width direction of the box body;

and the heat management flow channel is arranged in the accommodating cavity and is used for cooling or heating the first surface and the second surface.

2. The battery pack of claim 1, wherein the receiving cavity and the thermal management runner are integrally extruded on the case.

3. The battery pack according to claim 2, wherein the heat management flow channel has a first flow channel and a second flow channel independent of each other, the first flow channel and the second flow channel extend in a third direction, and the first flow channel and the second flow channel each pass through in the first direction, the heat exchange medium in the first flow channel cools or heats the first surface and the second surface of each of the electric core groups, and the heat exchange medium in the second flow channel cools or heats the first surface and the second surface of each of the electric core groups; wherein the third direction is a thickness direction of the case.

4. The battery pack according to claim 3, wherein the first flow channel and the second flow channel have a single-row lattice shape in cross section along the third direction.

5. The battery pack according to any one of claims 1 to 4, wherein a plurality of partition plates are formed inside the case, extend along the first direction, and are arranged in parallel at intervals in the second direction, and the accommodating chamber is defined between two adjacent partition plates.

6. The battery pack according to claim 5, wherein each of the separators has a first cavity and a second cavity, the first cavity and the second cavity extend along the first direction, the first cavities of two adjacent separators are communicated with each other, the second cavities of two adjacent separators are communicated with each other, the first cavities and the second cavities are filled with a heat exchange medium, and each of the separators is configured as the thermal management flow channel.

7. The battery pack according to claim 6, wherein the number of the battery packs is at least two, the separator located at the middle of the separators is referred to as a middle separator, the separators located at two sides of the middle separator among the remaining separators are referred to as a first separator and a second separator, and the middle separator, at least one first separator and at least one second separator are provided with a flow dividing joint, and the flow dividing joint is used for dividing the heat exchange medium inside the middle separator into each first separator and each second separator and enabling the heat exchange medium in the first cavity to flow back into the second cavity.

8. The battery pack of claim 7, wherein the shunt tabs comprise at least two of a three-way tab, a multi-way tab, a two-way tab, or a vertical tab.

9. The battery pack according to claim 8, wherein the vertical joint comprises a first vertical joint, one end of the middle separator is provided with an inlet and an outlet, the other end of the middle separator is connected with the three-way joint, the three-way joint is respectively connected with one first separator and one second separator, the rest first separators are sequentially connected in series through the two-way joint, the rest second separators are sequentially connected in series through the two-way joint, and free ends of the first separator at the outermost side and the second separator at the outermost side are respectively connected with the first vertical joint, so that the heat exchange medium in the first cavity flows back into the second cavity and is discharged from the outlet; wherein one of the inlet and the outlet is located in a region of the median septum communicating with the first cavity and the other is located in a region of the median septum communicating with the second cavity.

10. The battery pack according to claim 8, wherein the vertical joint comprises a second vertical joint, one end of the middle partition plate is formed with a liquid inlet and a liquid outlet, and one end of the middle partition plate is connected with the multi-way joint, the multi-way joint is respectively communicated with the liquid inlet, one end of the first partition plate and one end of the second partition plate so that the heat exchange medium flows in parallel among the middle partition plate, the first partition plate and the second partition plate, and the other end of the middle partition plate, the other end of the first partition plate and the other end of the second partition plate are respectively connected with the second vertical joint so that the heat exchange medium in the first cavity flows back into the second cavity and is discharged from the liquid outlet; one of the liquid inlet and the liquid outlet is positioned in an area, communicated with the first cavity, on the middle partition plate, and the other is positioned in an area, communicated with the second cavity, on the middle partition plate.

11. The battery pack according to any one of claims 3 to 4, wherein the electric core groups located in the same accommodating cavity comprise a plurality of pole core strings connected in series, and the first pole core group of one pole core string in two adjacent pole core strings is electrically connected with the first pole core group of the other pole core string.

12. The battery pack according to claim 11, wherein each of the electrode core groups includes a first electrode drawing-out part and a second electrode drawing-out part for drawing out current, and the first electrode drawing-out part of one of the adjacent two electrode core groups is electrically connected with the second electrode drawing-out part of the other electrode core group.

13. A vehicle characterized by comprising a battery pack according to any one of claims 1-12.