CN218241977U

CN218241977U - Heat exchanger and battery package, vehicle that have it

Info

Publication number: CN218241977U
Application number: CN202222002098.7U
Authority: CN
Inventors: 吴艳凤; 张顺; 王骁; 尤悦丘; 段真真
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2023-01-06
Anticipated expiration: 2032-07-29

Abstract

The utility model discloses a heat exchanger and battery package, vehicle that have it, the heat exchanger includes: the cooling device comprises a first cooling part and a second cooling part, wherein the heat exchanger is provided with a first direction and a second direction which are orthogonal to each other, and the first cooling part and the second cooling part are respectively arranged at two ends of the heat exchanger in the first direction; the first cooling part is provided with a first flow passage and a second flow passage which are communicated with each other, and the first flow passage and the second flow passage are arranged along a second direction; a third flow channel and a fourth flow channel which are communicated with each other are arranged on the second cooling part, and the third flow channel and the fourth flow channel are distributed along the second direction; the first flow passage has a first fluid inlet, the third flow passage has a second fluid inlet, the second flow passage has a first fluid outlet, and the fourth flow passage has a second fluid outlet. According to the utility model discloses a heat exchanger can guarantee the uniformity of electric core temperature, reduces the difference in temperature of electric core, improves the charge rate of battery package, has reduced the height of battery package.

Description

Heat exchanger and have its battery package, vehicle

Technical Field

The utility model belongs to the technical field of the battery technique and specifically relates to a heat exchanger and battery package, vehicle that have it is related to.

Background

In the related art, the cooling device of the battery pack cannot effectively dissipate heat of a main heat-generating region of the battery pack, cannot effectively ensure the uniformity of the temperature of the battery pack, and is easy to cause local overheating.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a heat exchanger can guarantee the uniformity of electric core temperature, reduces the difference in temperature of electric core, improves the charge rate of battery package, has reduced the height of battery package.

Another object of the utility model is to provide an adopt above-mentioned heat exchanger's battery package.

Another object of the present invention is to provide a vehicle using the above battery pack.

According to the utility model discloses heat exchanger, include: a first cooling portion and a second cooling portion, the heat exchanger having a first direction and a second direction, the first direction and the second direction being orthogonal to each other, the first cooling portion and the second cooling portion being respectively provided at both ends of the first direction of the heat exchanger; a first flow channel and a second flow channel which are communicated with each other are arranged on the first cooling part, and the first flow channel and the second flow channel are arranged along the second direction; a third flow channel and a fourth flow channel which are communicated with each other are arranged on the second cooling part, and the third flow channel and the fourth flow channel are arranged along the second direction; the first flow channel has a first fluid inlet, the third flow channel has a second fluid inlet, the second flow channel has a first fluid outlet, and the fourth flow channel has a second fluid outlet.

According to the utility model discloses heat exchanger, be equipped with the first runner and the second runner that communicate each other on the first cooling portion and arrange along the second direction, first runner has first fluid entry, and the second runner has first fluid export, and the second cooling portion communicates third runner and fourth runner each other and arranges along the second direction, and the third runner has second fluid entry, and the fourth runner has second fluid export. From this, when the heat exchanger is applied to the battery package, can increase the radiating efficiency of battery package, and can guarantee the uniformity of electric core temperature, reduce the difference in temperature of electric core for electric core can exert the biggest ability of filling soon, improves the charge rate of battery package, can reduce the height of battery package simultaneously, the miniaturized design of battery package of being convenient for.

According to the utility model discloses a some embodiments, the length direction's of heat exchanger size more than or equal to the width direction and the thickness direction's of heat exchanger size, the width direction's of heat exchanger size more than or equal to the thickness direction's of heat exchanger size, the length direction of heat exchanger does first direction, the width direction of heat exchanger does the second direction.

According to some embodiments of the present invention, the first heat exchanger further comprises: an intermediate portion connected between the first cooling portion and the second cooling portion, the intermediate portion being of a solid construction.

According to some embodiments of the invention, the first fluid inlet and the second fluid inlet are located at two ends of the first direction of the heat exchanger, respectively; the first fluid outlet and the second fluid outlet are respectively located at two ends of the heat exchanger in the first direction.

According to some embodiments of the invention, the flow direction of the cooling liquid in the first flow channel is opposite to the flow direction of the cooling liquid in the second flow channel; the flow direction of the cooling liquid in the third flow passage is opposite to the flow direction of the cooling liquid in the fourth flow passage.

According to some embodiments of the present invention, the first runner and the third runner do not communicate, the second runner and the fourth runner do not communicate.

According to the utility model discloses a some embodiments, the thickness of heat exchanger is D, wherein, D satisfies: d is more than or equal to 2mm and less than or equal to 5mm.

According to some embodiments of the utility model, the heat exchanger is harmonica pipe or the cold board of punching press brazing.

According to the utility model discloses battery package of second aspect embodiment includes: the battery pack comprises a plurality of battery packs, a plurality of battery packs and a plurality of battery packs, wherein the battery packs are arranged side by side and each battery pack comprises at least one battery cell; a plurality of heat exchangers, the heat exchanger with the electric core group is arranged in turn, the heat exchanger is according to the utility model discloses the heat exchanger of above-mentioned first aspect embodiment.

According to some embodiments of the invention, the heat exchanger has a third direction, the first direction, the second direction and the third direction being orthogonal to each other; and the distance between every two adjacent heat exchangers gradually increases from the center of the plurality of electric core groups to the two ends of the plurality of electric core groups along the third direction.

According to some embodiments of the invention, the third direction is a thickness direction of the heat exchanger.

According to some embodiments of the present invention, the battery pack further comprises: and the heat conduction member is positioned between the heat exchanger and the electric core group.

According to some embodiments of the present invention, the battery pack further comprises a first fluid conduit, a second fluid conduit, a third fluid conduit, and a fourth fluid conduit, the first fluid conduit is connected to the first fluid inlet of the heat exchanger, the second fluid conduit is connected to the first fluid outlet of the heat exchanger, the third fluid conduit is connected to the second fluid inlet of the heat exchanger, and the fourth fluid conduit is connected to the second fluid outlet of the heat exchanger.

According to some embodiments of the invention, the first fluid conduit does not communicate with the third fluid conduit, and the second fluid conduit does not communicate with the fourth fluid conduit.

According to the third aspect embodiment of the present invention, the vehicle includes the battery pack according to the first aspect embodiment of the present invention.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is an exploded view of a battery pack according to an embodiment of the present invention;

fig. 2 is a partial sectional view of the battery pack shown in fig. 1;

fig. 3 is a schematic view of the cells and heat exchange assembly of the battery pack shown in fig. 1;

fig. 4 is a schematic view of the heat exchanger, heat conducting member and cell of the battery pack shown in fig. 1;

fig. 5 is a schematic diagram of a cell of a battery pack according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of the cells of the battery pack shown in fig. 5;

fig. 7 is a cross-sectional view of another angle of the cells of the battery pack shown in fig. 5.

Reference numerals are as follows:

100: a battery pack;

1: a tray; 11: a body; 12: a cover body; 2: the electric core group; 21: an electric core;

31: a first fluid conduit; 32: a third fluid conduit;

41: a second fluid conduit; 42: a fourth fluid conduit; 5: a heat exchanger;

51: a first cooling section; 511: a first fluid inlet; 512: a first fluid outlet;

52: an intermediate portion; 53: a second cooling section; 531: a second fluid inlet; 532: a second fluid outlet;

54: a first flow passage; 55: a second flow passage; 56: an intermediate flow passage;

6: a heat conductive member; 7: structural adhesive; 8: a liquid inlet pipe joint; 9: and a liquid outlet pipe joint.

Detailed Description

A heat exchange assembly according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1-7.

As shown in fig. 1 to 7, the heat exchanger 5 according to the embodiment of the first aspect of the present invention includes a first cooling portion 51 and a second cooling portion 53, the heat exchanger 5 has a first direction and a second direction, the first direction and the second direction are orthogonal to each other, and the first cooling portion 51 and the second cooling portion 53 are respectively disposed at two ends of the first direction of the heat exchanger 5. The first cooling portion 51 is provided with a first flow passage 54 and a second flow passage 55 which are communicated with each other, the first flow passage 54 and the second flow passage 55 are arranged along the second direction, the second cooling portion 53 is provided with a third flow passage and a fourth flow passage which are communicated with each other, and the third flow passage and the fourth flow passage are arranged along the second direction. The first flow channel 54 has a first fluid inlet, the third flow channel has a second fluid inlet, the second flow channel 55 has a first fluid outlet, and the fourth flow channel has a second fluid outlet.

With reference to fig. 1, it should be noted that the dimension of the heat exchanger 5 in the longitudinal direction is equal to or greater than the dimensions of the heat exchanger 5 in the width direction and the thickness direction, the dimension of the heat exchanger 5 in the width direction is equal to or greater than the dimension of the heat exchanger 5 in the thickness direction, the first direction refers to the length direction of the heat exchanger 5 (for example, the front-rear direction in fig. 1), the second direction refers to the width direction of the heat exchanger 5 (for example, the up-down direction in fig. 1), and the third direction refers to the thickness direction of the heat exchanger 5 (for example, the left-right direction in fig. 1).

For example, in the example of fig. 5-7, the first flow passage 54, the second flow passage 55, the third flow passage, and the fourth flow passage may each extend along a length of the heat exchanger 5, with the first flow passage 54 and the second flow passage 55 therebetween, and the third flow passage and the fourth flow passage may communicate with each other via an intermediate flow passage 56, with the intermediate flow passage 56 extending along the second direction of the heat exchanger 5. Wherein the first flow channel 54 and the third flow channel may be located at an upper portion of the heat exchanger 5, and the second flow channel 55 and the fourth flow channel may be located at a lower portion of the heat exchanger 5. When the heat exchanger 5 is applied to the battery pack 100, since two ends of the battery core 21 of the battery pack 100 in the length direction are main heat generating areas, the cooling liquid may flow into the first flow channel 54 through the first fluid inlet, and flow out through the second flow channel 55 and the first fluid outlet, and at the same time, the cooling liquid may flow into the third flow channel through the second fluid inlet, and flow out through the fourth flow channel and the second fluid outlet, and the cooling liquid exchanges heat with the battery core 211 in the flow channel, so as to dissipate heat of the battery pack 100.

From this, establish at the both ends of the first direction of heat exchanger 5 through making first cooling portion 51 and second cooling portion 53 that are equipped with the runner, can realize the both ends synchronous heat dissipation of the length direction of electric core 21, thereby can improve the radiating efficiency, can reduce the temperature of electric core 21 fast, and can guarantee that the temperature of electric core 21 is unanimous, avoid the heat transfer difference or the secondary heating of electric core 21 that the coolant liquid difference in temperature of the fluid entry of heat exchanger 5 and fluid outlet is great to bring, in guaranteeing that electric core 21 does not have the lithium of separating, in the potential safety hazard and maintaining certain life-span simultaneously, can exert the biggest fast charge ability of electric core 21, the charge rate of battery package 100 has been improved.

According to the utility model discloses heat exchange assembly, through making first runner 54 and the second runner 55 that communicate each other on the first cooling portion 51 arrange along the second direction, first runner 54 has first fluid entry, and second runner 55 has first fluid export, and second cooling portion 53 communicates third runner and fourth runner each other and arranges along the second direction, and the third runner has second fluid entry, and the fourth runner has second fluid export. From this, when heat exchanger 5 is applied to battery package 100, can increase battery package 100's radiating efficiency, and can guarantee the uniformity of electric core 21 temperature, reduce electric core 21's the difference in temperature for electric core 21 can exert the biggest ability of charging soon, improves battery package 100's charge rate, can reduce battery package 100's height simultaneously, the miniaturized design of battery package 100 of being convenient for.

According to some embodiments of the present invention, as shown in fig. 6, the heat exchanger 5 further comprises an intermediate portion 52, the intermediate portion 52 being connected between the first cooling portion 51 and the second cooling portion 53, the intermediate portion 52 being of solid construction. With this arrangement, the structural strength of the intermediate portion 52 can be enhanced, since the expansion force of the battery cell 21 is mainly distributed in the middle, so that the intermediate heat exchanger can withstand the expansion force of the battery cell 21.

According to some embodiments of the present invention, the first fluid inlet 511 and the second fluid inlet 531 are located at two ends of the first direction of the heat exchanger 5, respectively, and the first fluid outlet 512 and the second fluid outlet 532 are located at two ends of the first direction of the heat exchanger 5, respectively. Referring to fig. 3 and 4, the first and

second fluid inlets

511 and 531 are opposite to each other in the first direction of the heat exchanger 5, and the first and

second fluid inlets

511 and 531 are located at an upper portion of the heat exchanger 5, the first and

second fluid outlets

512 and 532 are opposite to each other in the first direction of the heat exchanger 5, and the first and

second fluid outlets

512 and 532 are located at a lower portion of the heat exchanger 5. From this, can realize dispelling the heat simultaneously to electric core 21's length direction's both ends, and heat exchanger 5's structure is more regular, easy to assemble.

According to some embodiments of the present invention, the flow direction of the cooling liquid in the first flow channel 54 is opposite to the flow direction of the cooling liquid in the second flow channel 55, and the flow direction of the cooling liquid in the third flow channel is opposite to the flow direction of the cooling liquid in the fourth flow channel. With this arrangement, the flow path of the cooling liquid on the heat exchanger 5 can be increased, so that the heat exchange efficiency of the heat exchanger 5 can be improved.

According to some embodiments of the present invention, the first flow passage 54 and the third flow passage do not communicate, and the second flow passage 55 and the fourth flow passage do not communicate. Accordingly, while the main heat generation region of the battery pack 100 is subjected to targeted heat dissipation, the length of the flow channel can be shortened, and the structural strength of the heat exchanger 5 can be improved.

According to the utility model discloses a some embodiments, heat exchanger 5's thickness is D, and wherein, D satisfies: d is more than or equal to 2mm and less than or equal to 5mm. When D is less than 2mm, the thickness of the heat exchanger 5 is small, so that the structural strength of the heat exchanger 5 is poor, the heat exchanger 5 is easy to deform during installation or use, and the heat dissipation efficiency of the battery pack 100 is affected; when D > 5.0mm, the thickness of the heat exchanger 5 is large, which increases the size of the battery pack 100 in the third direction. Thus, by making D satisfy: d is more than or equal to 2mm and less than or equal to 5mm, the structural strength of the heat exchanger 5 can be ensured, the deformation of the heat exchanger 5 is avoided, meanwhile, the heat dissipation efficiency of the battery pack 100 can be ensured, and the size of the battery pack 100 in the third direction is reduced.

Alternatively, the heat exchanger 5 may be a harmonica tube or a press-brazed cold plate, but is not limited thereto.

As shown in fig. 1 to 3, a battery pack 100 according to an embodiment of the present invention includes a plurality of battery cells 2 and a plurality of heat exchangers 5, and in the description of the present invention, "plurality" means two or more. A plurality of electric core groups 2 are placed side by side, and every electric core group 2 includes at least one electric core 21, and heat exchanger 5 arranges in turn with electric core group 2, and heat exchanger 5 is according to the utility model discloses the heat transfer assembly of above-mentioned first aspect embodiment.

For example, in the example of fig. 1 to 3, the battery pack 100 further includes a tray 1, the tray 1 is rectangular, the tray 1 has a receiving cavity, the number of the electric core groups 2 is twenty three, each electric core group 2 includes one electric core 21, the electric core 21 extends along the length direction of the tray 1, the number of the heat exchangers 5 is twenty four, and the twenty three electric cores 21 and the twenty four heat exchangers 5 are arranged in the receiving cavity of the tray 1 in a staggered manner along the third direction. Heat exchanger 5 extends along the length direction of tray 1, and heat exchanger 5 that is located the outside can connect with the device intercommunication that holds the coolant liquid through inlet pipe joint 8 and drain pipe joint 9.

When the temperature of the battery pack 100 rises, the cooling liquid can flow into the corresponding first flow channel 54 and third flow channel of the heat exchanger 5 through the two liquid inlet pipe joints 8, the first flow channel inlet 511 and the second flow channel inlet 531 at the two ends of the heat exchanger 5 in the length direction, at this time, the cooling liquid in the flow channels exchanges heat with the battery cell 21 to reduce the temperature of the battery cell 21, and the cooling liquid after heat exchange flows into the second flow channel 55 and the fourth flow channel and flows back into the device for containing the cooling liquid through the first flow channel outlet 512 and the second flow channel outlet 532. From this, compare with traditional battery package 100, increased the area of contact of heat exchanger 5 with electric core 21, and in the coolant liquid can flow into heat exchanger 5 from electric core 21's length direction's both ends simultaneously to can improve the radiating efficiency, and can guarantee that the temperature at electric core 21's length direction's both ends is unanimous, reduced electric core 21's the difference in temperature.

Twenty-three cells 21 and twenty-four heat exchangers 5 are shown in fig. 1 for illustrative purposes, but it is obvious that a person skilled in the art can understand that the solution is applied to other numbers of cells 21 and heat exchangers 5 after reading the technical solution of the present application, and this also falls into the protection scope of the present invention.

According to the utility model discloses battery package 100 through adopting above-mentioned heat exchange assemblies, can improve battery package 100's heat exchange efficiency, and can guarantee the uniformity of battery package 100's temperature.

According to the utility model discloses a some embodiments, along the third direction, from a plurality of electric core group 2's center to a plurality of electric core group 2's both ends, the distance between two adjacent heat exchangers 5 increases gradually. The closer the heat exchangers 5 are to the center of the plurality of electric core groups 2, the greater the density of the heat exchangers 5 is, the middle area of the battery pack 100 is often higher than the two end areas, and the greater the density of the heat exchangers 5 in the middle of the battery pack 100 is, so that the temperature of the battery pack 100 can be quickly reduced, the number of the heat exchangers 5 is reduced, and the cost of the battery pack 100 is reduced.

In some optional embodiments, the battery pack 100 further comprises a heat conduction member 6, and the heat conduction member 6 is located between the heat exchanger 5 and the electric core assembly 2. Referring to fig. 4, the heat conducting members 6 are disposed on both sides of the battery cell 21 in the third direction, so that the thermal conductivity between the battery cell 21 and the heat exchanger 5 can be increased, heat on the battery cell 21 can be transferred to the heat exchanger 5 as much as possible, and the heat dissipation efficiency of the battery pack 100 can be further improved.

Further, as shown in fig. 4, the battery pack 100 further includes a first fluid conduit 31, a second fluid conduit 41, a third fluid conduit 32, and a fourth fluid conduit 42, wherein the first fluid conduit 31 is connected to a first fluid inlet 511 of the heat exchanger 5, the second fluid conduit 41 is connected to a first fluid outlet 532 of the heat exchanger 5, the third fluid conduit 32 is connected to a second fluid inlet 511 of the heat exchanger 5, and the fourth fluid conduit 42 is connected to a second fluid outlet 532 of the heat exchanger 5. Specifically, the adjacent two heat exchangers 5 can communicate with the first flow passage 54 of the adjacent two heat exchangers 5 through the first fluid pipeline 31, the adjacent two heat exchangers 5 can communicate with the second flow passage 55 of the adjacent two heat exchangers 5 through the second fluid pipeline 41, the adjacent two heat exchangers 5 can communicate with the third flow passage of the adjacent two heat exchangers 5 through the third fluid pipeline 32, and the adjacent two heat exchangers 5 can communicate with the fourth flow passage of the adjacent two heat exchangers 5 through the fourth fluid pipeline 42. Thus, when the battery pack 100 dissipates heat, the coolant can flow to the plurality of heat exchangers 5 at the same time to rapidly reduce the temperature of the battery pack 100.

Further, the first fluid conduit 31 is not in communication with the third fluid conduit 32, and the second fluid conduit 41 is not in communication with the fourth fluid conduit 42. Thus, the length of the flow channel can be shortened while heat dissipation is achieved at the end of the battery pack 100, and the structural strength of the heat exchanger 5 can be improved.

Alternatively, the heat-conducting member 6 may be, but is not limited to, a heat-conducting structural adhesive 7, a heat-conducting silicone gel, or a heat-conducting silicone grease. As long as the material of which the heat conductive member 6 is made is a high temperature resistant insulating material.

Alternatively, the battery cell 21 may be a rechargeable secondary battery cell, for example, a lithium iron phosphate battery cell or a ternary material battery cell, but is not limited thereto.

Alternatively, the heat exchanger 5 may be a metal member such as an aluminum alloy member, and the heat exchanger made of a metal material may serve as a fireproof member, so that the use safety of the battery pack 100 may be improved.

According to the utility model discloses a some embodiments, the surface of heat exchanger 5 is equipped with the insulating layer, transmits the electric current to heat exchanger 5 when avoiding electric core 21 electric leakage on. Wherein, the insulating layer can be formed on the surface of the heat exchanger 5 by spraying, electrophoresis or wrapping an insulating film.

According to some embodiments of the present invention, as shown in fig. 1, the tray 1 includes a body 11 and a cover 12, the plurality of electric core sets 2 are disposed in the body 11, one side of the body 11 is open, the cover 12 is disposed on the open side of the body 11, and the cover 12 is connected to the plurality of electric core sets 2 through the structural adhesive 9. So set up to guarantee that a plurality of electric core groups 2 are located the confined space, avoid liquid to get into and hold the intracavity, thereby can avoid battery package 100 short circuit, prolonged battery package 100's life. Alternatively, the material of the pallet 1 may be an aluminum alloy, copper, or a composite material having high structural strength.

According to a third aspect of the present invention, a vehicle (not shown) includes the battery pack 100 according to the second aspect of the present invention.

According to the utility model discloses vehicle through adopting above-mentioned battery package 100, can improve battery package 100's radiating efficiency to can put forward some battery package 100's charge rate, and then improve the charge rate of vehicle.

Other configurations and operations of vehicles according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A heat exchanger, comprising: a first cooling portion and a second cooling portion, the heat exchanger having a first direction and a second direction, the first direction and the second direction being orthogonal to each other, the first cooling portion and the second cooling portion being respectively provided at both ends of the heat exchanger in the first direction;

a first flow channel and a second flow channel which are communicated with each other are arranged on the first cooling part, and the first flow channel and the second flow channel are arranged along the second direction;

a third flow channel and a fourth flow channel which are communicated with each other are arranged on the second cooling part, and the third flow channel and the fourth flow channel are arranged along the second direction;

the first flow passage has a first fluid inlet, the third flow passage has a second fluid inlet, the second flow passage has a first fluid outlet, and the fourth flow passage has a second fluid outlet.

2. The heat exchanger according to claim 1, wherein a dimension in a length direction of the heat exchanger is equal to or greater than a dimension in a width direction and a dimension in a thickness direction of the heat exchanger, the dimension in the width direction of the heat exchanger is equal to or greater than the dimension in the thickness direction of the heat exchanger, the length direction of the heat exchanger is the first direction, and the width direction of the heat exchanger is the second direction.

3. The heat exchanger of claim 1, further comprising:

an intermediate portion connected between the first cooling portion and the second cooling portion, the intermediate portion being of a solid construction.

4. The heat exchanger of claim 1, wherein the first fluid inlet and the second fluid inlet are located at respective ends of the heat exchanger in the first direction;

the first fluid outlet and the second fluid outlet are respectively located at two ends of the heat exchanger in the first direction.

5. The heat exchanger of claim 1, wherein a flow direction of the cooling liquid in the first flow passage is opposite to a flow direction of the cooling liquid in the second flow passage;

the flow direction of the cooling liquid in the third flow passage is opposite to the flow direction of the cooling liquid in the fourth flow passage.

6. The heat exchanger of claim 1, wherein the first flow passage is not in communication with the third flow passage and the second flow passage is not in communication with the fourth flow passage.

7. The heat exchanger of claim 1, wherein the heat exchanger has a thickness D, wherein D satisfies: d is more than or equal to 2mm and less than or equal to 5mm.

8. The heat exchanger of any one of claims 1 to 7, wherein the heat exchanger is a harmonica tube or a stamped and brazed cold plate.

9. A battery pack, comprising:

the battery pack comprises a plurality of battery packs, a plurality of battery packs and a plurality of battery packs, wherein the battery packs are arranged side by side and each battery pack comprises at least one battery cell; and

a plurality of heat exchangers, the heat exchangers and the electric core group are arranged alternately, and the heat exchangers are according to any one of claims 1-8.

10. The battery pack of claim 9, wherein the heat exchanger has a third direction, the first, second, and third directions being orthogonal to one another;

and the distance between every two adjacent heat exchangers gradually increases from the centers of the electric core groups to the two ends of the electric core groups along the third direction.

11. The battery pack according to claim 10, wherein the third direction is a thickness direction of the heat exchanger.

12. The battery pack of claim 10, further comprising:

and the heat conducting piece is positioned between the heat exchanger and the electric core group.

13. The battery pack of claim 12, further comprising a first fluid conduit coupled to the first fluid inlet of the heat exchanger, a second fluid conduit coupled to the first fluid outlet of the heat exchanger, a third fluid conduit coupled to the second fluid inlet of the heat exchanger, and a fourth fluid conduit coupled to the second fluid outlet of the heat exchanger.

14. The battery pack of claim 13, wherein the first fluid conduit is not in communication with the third fluid conduit and the second fluid conduit is not in communication with the fourth fluid conduit.

15. A vehicle characterized by comprising a battery pack according to any one of claims 9-14.