CN218241977U - Heat exchanger and battery pack thereof, vehicle therewith - Google Patents

Abstract

The utility model discloses a heat exchanger and a battery pack and a vehicle thereof. The heat exchanger comprises: a first cooling part and a second cooling part, the heat exchanger has a first direction and a second direction, and the first direction and the second direction The second directions are perpendicular to each other, and the first cooling part and the second cooling part are respectively arranged at both ends of the heat exchanger in the first direction; the first cooling part is provided with a first flow channel and a second flow channel communicating with each other, and the second cooling part The first flow channel and the second flow channel are arranged along the second direction; the second cooling part is provided with a third flow channel and a fourth flow channel communicating with each other, 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 heat exchanger of the utility model, it can ensure the consistency of the battery core temperature, reduce the temperature difference of the battery core, increase the charging rate of the battery pack, and reduce the height of the battery pack.

Description

Heat exchanger and battery pack thereof, vehicle therewith

technical field

The utility model relates to the technical field of batteries, in particular to a heat exchanger, a battery pack and a vehicle with the heat exchanger.

Background technique

In related technologies, the cooling device of the battery pack cannot effectively dissipate heat from the main heat-generating area of the battery pack, and cannot effectively ensure the uniformity of the temperature of the battery pack, which may easily lead to local overheating.

Utility model content

The utility model aims at at least solving one of the technical problems existing in the prior art. Therefore, an object of the utility model is to provide a heat exchanger, which can ensure the consistency of the battery core temperature, reduce the temperature difference of the battery core, increase the charging rate of the battery pack, and reduce the height of the battery pack.

Another object of the present utility model is to provide a battery pack using the above-mentioned heat exchanger.

Another object of the present utility model is to provide a vehicle using the above-mentioned battery pack.

The heat exchanger according to an embodiment of the present invention includes: a first cooling part and a second cooling part, the heat exchanger has a first direction and a second direction, and the first direction and the second direction are perpendicular to each other. In addition, the first cooling part and the second cooling part are respectively arranged at both ends of the heat exchanger in the first direction; Two flow channels, the first flow channel and the second flow channel are arranged along the second direction; the second cooling part is provided with a third flow channel and a fourth flow channel communicating with each other, the first flow channel The three channels and the fourth channel are arranged along the second direction; the first channel has a first fluid inlet, the third channel has a second fluid inlet, and the second channel has a first fluid inlet. A fluid outlet, the fourth channel has a second fluid outlet.

According to the heat exchanger according to the embodiment of the utility model, the first cooling part is provided with a first flow channel and a second flow channel communicating with each other along the second direction, the first flow channel has a first fluid inlet, and the second flow channel has a The first fluid outlet and the second cooling part communicate with each other. The third flow channel and the fourth flow channel are arranged along the second direction. The third flow channel has a second fluid inlet, and the fourth flow channel has a second fluid outlet. Therefore, when the heat exchanger is applied to the battery pack, it can increase the heat dissipation efficiency of the battery pack, ensure the consistency of the temperature of the battery core, reduce the temperature difference of the battery core, and enable the battery core to exert the maximum fast charging capacity and improve The charging rate of the battery pack can be reduced, and the height of the battery pack can be reduced, which is convenient for the miniaturization design of the battery pack.

According to some embodiments of the present utility model, the dimension of the heat exchanger in the length direction is greater than or equal to the dimension of the width direction and the thickness direction of the heat exchanger, and the dimension of the heat exchanger in the width direction is greater than or equal to the dimension of the heat exchanger The dimension of 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.

According to some embodiments of the present invention, the first heat exchanger further includes: a middle part connected between the first cooling part and the second cooling part, the middle part is solid structure.

According to some embodiments of the present utility model, the first fluid inlet and the second fluid inlet are respectively located at both ends of the heat exchanger in the first direction; the first fluid outlet and the second The fluid outlets are respectively located at both ends of the heat exchanger in the first direction.

According to some embodiments of the present 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 channel The direction is opposite to the flow direction of the cooling liquid in the fourth channel.

According to some embodiments of the present invention, the first flow channel is not connected to the third flow channel, and the second flow channel is not connected to the fourth flow channel.

According to some embodiments of the present utility model, the thickness of the heat exchanger is D, wherein the D satisfies: 2mm≤D≤5mm.

According to some embodiments of the present invention, the heat exchanger is a harmonica tube or a stamped and brazed cold plate.

The battery pack according to the embodiment of the second aspect of the present invention includes: a plurality of battery packs, a plurality of the battery packs are placed side by side, and each of the battery packs includes at least one battery cell; a plurality of heat exchangers , the heat exchangers are arranged alternately with the cell packs, and the heat exchangers are the heat exchangers according to the embodiment of the first aspect of the present utility model.

According to some embodiments of the present invention, the heat exchanger has a third direction, the first direction, the second direction and the third direction are orthogonal to each other; along the third direction, from the The distance between two adjacent heat exchangers gradually increases from the center of the plurality of cell groups toward the two ends of the plurality of cell groups.

According to some embodiments of the present utility model, the third direction is the thickness direction of the heat exchanger.

According to some embodiments of the present utility model, the battery pack further includes: a heat conduction element, and the heat conduction element is located between the heat exchanger and the battery pack.

According to some embodiments of the present utility model, the battery pack further includes a first fluid pipeline, a second fluid pipeline, a third fluid pipeline and a fourth fluid pipeline, and the first fluid pipeline and the first fluid pipeline of the heat exchanger The fluid inlet is connected, the second fluid pipe is connected with the first fluid outlet of the heat exchanger, the third fluid pipe is connected with the second fluid inlet of the heat exchanger, and the fourth fluid pipe is connected with the The second fluid outlet of the heat exchanger is connected.

According to some embodiments of the present utility model, the first fluid pipeline is not connected to the third fluid pipeline, and the second fluid pipeline is not connected to the fourth fluid pipeline.

The vehicle according to the embodiment of the third aspect of the utility model includes the battery pack according to the embodiment of the above first aspect of the utility model.

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

Description of drawings

The above and/or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

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

Fig. 2 is a partial cross-sectional view of the battery pack shown in Fig. 1;

Fig. 3 is a schematic diagram of the cells and heat exchange components of the battery pack shown in Fig. 1;

Fig. 4 is a schematic diagram of a heat exchanger, a heat conducting member and an electric core 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 cell of the battery pack shown in Fig. 5;

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

Reference signs:

100: battery pack;

1: Tray; 11: Body; 12: Cover; 2: Battery pack; 21: Battery;

31: first fluid pipeline; 32: third fluid pipeline;

41: second fluid pipeline; 42: fourth fluid pipeline; 5: heat exchanger;

51: first cooling unit; 511: first fluid inlet; 512: first fluid outlet;

52: middle part; 53: second cooling part; 531: second fluid inlet; 532: second fluid outlet;

54: the first flow channel; 55: the second flow channel; 56: the middle flow channel;

6: Heat conduction parts; 7: Structural glue; 8: Liquid inlet pipe joint; 9: Liquid outlet pipe joint.

detailed description

The heat exchange assembly according to the embodiment of the first aspect of the present utility model will be described below with reference to FIGS. 1-7 .

As shown in Figures 1-7, the heat exchanger 5 according to the embodiment of the first aspect of the present invention includes a first cooling part 51 and a second cooling part 53, and the heat exchanger 5 has a first direction and a second direction, The first direction and the second direction are perpendicular to each other, and the first cooling part 51 and the second cooling part 53 are respectively provided at both ends of the heat exchanger 5 in the first direction. The first cooling part 51 is provided with a first channel 54 and a second channel 55 communicating with each other. The first channel 54 and the second channel 55 are arranged along the second direction. The second cooling part 53 is provided with a channel communicating with each other. The third flow channel and the fourth flow channel 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.

In conjunction with FIG. 1 , it should be noted that the dimension in the length direction of the heat exchanger 5 is greater than or equal to the dimension in the width direction and thickness direction of the heat exchanger 5 , and the dimension in the width direction of the heat exchanger 5 is greater than or equal to the thickness of the heat exchanger 5 The size of the direction, the first direction refers to the length direction of the heat exchanger 5 (for example, the front and rear direction in Fig. 1), and the second direction refers to the width direction of the heat exchanger 5 (for example, the up and down direction in Fig. 1 ), 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 examples shown in FIGS. Between the two flow channels 55 , between the third flow channel and the fourth flow channel may communicate through an intermediate flow channel 56 , and the intermediate flow channel 56 extends along the second direction of the heat exchanger 5 . Wherein, the first flow channel 54 and the third flow channel may be located at the upper part of the heat exchanger 5 , and the second flow channel 55 and the fourth flow channel may be located at the lower part of the heat exchanger 5 . When the heat exchanger 5 is applied to the battery pack 100, since the two ends of the battery cell 21 in the length direction of the battery pack 100 are the main heating areas, the cooling liquid can flow to the first flow channel 54 through the first fluid inlet, and through the second flow channel 54. Channel 55 and the first fluid outlet flow out, while the cooling liquid can flow to the third flow channel through the second fluid inlet, and flow out through the fourth flow channel and the second fluid outlet, the cooling liquid exchanges heat with the battery cell 211 in the flow channel, In order to realize the heat dissipation of the battery pack 100 .

Thus, by setting the first cooling part 51 and the second cooling part 53 provided with flow passages at both ends of the heat exchanger 5 in the first direction, synchronous heat dissipation can be realized at both ends of the length direction of the electric core 21, thereby The heat dissipation efficiency can be improved, the temperature of the battery cell 21 can be quickly reduced, and the temperature of the battery cell 21 can be ensured to be consistent, so as to avoid heat transfer differences or electric current caused by the large temperature difference between the fluid inlet and the fluid outlet of the heat exchanger 5. The secondary heating of the battery cell 21 can give full play to the maximum fast charging capability of the battery cell 21 and improve the charging rate of the battery pack 100 while ensuring that the battery cell 21 has no lithium analysis, no safety hazard, and maintains a certain service life.

According to the heat exchange assembly of the embodiment of the present utility model, the first flow channel 54 and the second flow channel 55 communicating with each other on the first cooling part 51 are arranged along the second direction, the first flow channel 54 has a first fluid inlet, and the second flow channel 54 has a first fluid inlet. The second flow channel 55 has a first fluid outlet, and the second cooling part 53 communicates with each other. The third flow channel and the fourth flow channel are arranged along the second direction. The third flow channel has a second fluid inlet, and the fourth flow channel has a second fluid inlet. Fluid outlet. Therefore, when the heat exchanger 5 is applied to the battery pack 100, the heat dissipation efficiency of the battery pack 100 can be increased, and the consistency of the temperature of the battery cells 21 can be ensured, and the temperature difference of the battery cells 21 can be reduced, so that the battery cells 21 can exert their maximum performance. fast charging capability, improve the charging rate of the battery pack 100, and reduce the height of the battery pack 100, which is convenient for the miniaturization design of the battery pack 100.

According to some embodiments of the present utility model, as shown in FIG. 6, the heat exchanger 5 further includes a middle part 52, the middle part 52 is connected between the first cooling part 51 and the second cooling part 53, and the middle part 52 is a solid structure . Such arrangement can enhance the structural strength of the middle part 52 , since the expansion force of the electric core 21 is mainly distributed in the middle, so that the intermediate heat exchanger can withstand the expansion force of the electric core 21 .

According to some embodiments of the present utility model, the first fluid inlet 511 and the second fluid inlet 531 are respectively located at both ends of the heat exchanger 5 in the first direction, and the first fluid outlet 512 and the second fluid outlet 532 are respectively located at 5 at both ends of the first direction. 3 and 4, the first fluid inlet 511 and the second fluid inlet 531 are opposite to each other in the first direction of the heat exchanger 5, and the first fluid inlet 511 and the second fluid inlet 531 are located at the upper part of the heat exchanger 5 , the first fluid outlet 512 and the second fluid outlet 532 are opposite to each other in the first direction of the heat exchanger 5 , and the first fluid outlet 512 and the second fluid outlet 532 are located at the lower part of the heat exchanger 5 . In this way, heat can be dissipated at both ends of the battery cell 21 in the length direction at the same time, and the structure of the heat exchanger 5 is more regular, which is convenient for installation.

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 that of the cooling liquid in the fourth flow channel. The flow direction of the channel is opposite. Such setting can increase the flow path of the cooling liquid on the heat exchanger 5 , thereby improving the heat exchange efficiency of the heat exchanger 5 .

According to some embodiments of the present invention, the first flow channel 54 is not connected to the third flow channel, and the second flow channel 55 is not connected to the fourth flow channel. In this way, while achieving targeted heat dissipation to the main heat-generating regions of the battery pack 100 , the length of the flow channel can be shortened, and the structural strength of the heat exchanger 5 can be improved.

According to some embodiments of the present utility model, the thickness of the heat exchanger 5 is D, wherein, D satisfies: 2mm≤D≤5mm. When D<2mm, the thickness of the heat exchanger 5 is small, so that the structural strength of the heat exchanger 5 is poor, so that the heat exchanger 5 is prone to deformation during installation or use, which affects the heat dissipation efficiency of the battery pack 100; when D When >5.0mm, the thickness of the heat exchanger 5 is relatively large, which will increase the size of the battery pack 100 in the third direction. Therefore, by making D satisfy: 2mm≤D≤5mm, the structural strength of the heat exchanger 5 can be ensured, the deformation of the heat exchanger 5 can be avoided, and the heat dissipation efficiency of the battery pack 100 can be ensured, reducing the risk of the battery pack 100 being exposed to third parties. Dimensions up.

Optionally, the heat exchanger 5 may be a harmonica tube or a stamped and brazed cold plate, but not limited thereto.

As shown in Figures 1-3, the battery pack 100 according to the embodiment of the second aspect of the present invention includes a plurality of battery packs 2 and a plurality of heat exchangers 5, and in the description of the present invention, "multiple" means two or more. A plurality of cell groups 2 are placed side by side, and each cell group 2 includes at least one cell 21, and the heat exchanger 5 is alternately arranged with the cell group 2, and the heat exchanger 5 is implemented according to the above-mentioned first aspect of the utility model Example of heat exchange components.

For example, in the examples shown in FIGS. 1-3 , the battery pack 100 also includes a tray 1 , the shape of the tray 1 is rectangular, the tray 1 has a housing cavity, and there are twenty-three battery packs 2 , and each battery pack 2 includes One battery cell 21, and the battery cell 21 extends along the length direction of the tray 1, there are twenty-four heat exchangers 5, and twenty-three battery cells 21 and twenty-four heat exchangers 5 are arranged alternately along the third direction In the cavity of tray 1. The heat exchanger 5 extends along the length of the tray 1 , and the outermost heat exchanger 5 can communicate with the cooling liquid storage device through a liquid inlet pipe joint 8 and a liquid outlet pipe joint 9 .

When the temperature of the battery pack 100 rises, the cooling liquid can flow to the corresponding heat exchange through the two liquid inlet pipe joints 8, the first flow channel inlet 511 and the second flow channel inlet 531 located at both ends of the heat exchanger 5 in the length direction. In the first flow channel 54 and the third flow channel of the device 5, at this time, the cooling liquid in the flow channel exchanges heat with the battery cell 21 to reduce the temperature of the battery cell 21, and the cooling liquid after heat exchange flows to the second flow channel 55 and the second flow channel 55. The four channels flow back into the cooling liquid device through the first channel outlet 512 and the second channel outlet 532 . Thus, compared with the traditional battery pack 100, the contact area between the heat exchanger 5 and the battery cell 21 is increased, and the cooling liquid can flow into the heat exchanger 5 from both ends of the battery cell 21 in the length direction. , so that the heat dissipation efficiency can be improved, and the temperature at both ends in the length direction of the battery cell 21 can be guaranteed to be consistent, reducing the temperature difference of the battery cell 21 .

In Fig. 1, twenty-three battery cells 21 and twenty-four heat exchangers 5 are shown for the purpose of illustration, but after reading the technical solution of the present application, those of ordinary skill can obviously understand that the solution is applied to In the technical solutions of other numbers of electric cores 21 and heat exchangers 5, this also falls within the protection scope of the present invention.

According to the battery pack 100 of the embodiment of the present invention, the heat exchange efficiency of the battery pack 100 can be improved and the temperature consistency of the battery pack 100 can be ensured by using the above-mentioned heat exchange assembly.

According to some embodiments of the present invention, the distance between two adjacent heat exchangers 5 gradually increases along the third direction, from the center of the plurality of cell groups 2 to both ends of the plurality of cell groups 2 . At this time, the concentration of the central heat exchanger 5 closer to the plurality of battery packs 2 is greater. Since the middle area of the battery pack 100 is often higher than the two end areas, by increasing the density of the heat exchanger 5 located in the middle of the battery pack 100 If the setting is larger, while the temperature of the battery pack 100 can be quickly lowered, the number of heat exchangers 5 is reduced, and the cost of the battery pack 100 is reduced.

In some optional embodiments, the battery pack 100 further includes a heat conduction member 6 , and the heat conduction member 6 is located between the heat exchanger 5 and the battery pack 2 . Referring to FIG. 4 , heat conducting members 6 are provided on both sides of the battery cell 21 in the third direction, thereby increasing the thermal conductivity between the battery cell 21 and the heat exchanger 5 so that the heat on the battery cell 21 can be Transfer as much as possible to the heat exchanger 5 to further improve the heat dissipation efficiency of the battery pack 100 .

Further, as shown in FIG. 4 , the battery pack 100 also includes a first fluid pipeline 31 , a second fluid pipeline 41 , a third fluid pipeline 32 and a fourth fluid pipeline 42 , the first fluid pipeline 31 is connected to the second fluid pipeline of the heat exchanger 5 A fluid inlet 511 is connected, the second fluid pipeline 41 is connected with the first fluid outlet 532 of the heat exchanger 5, the third fluid pipeline 32 is connected with the second fluid inlet 511 of the heat exchanger 5, and the fourth fluid pipeline 42 is connected with the heat exchanger 5. The second fluid outlet 532 of the device 5 is connected. Specifically, two adjacent heat exchangers 5 can realize the communication of the first flow channel 54 of two adjacent heat exchangers 5 through the first fluid pipe 31, and two adjacent heat exchangers 5 can pass through the second fluid pipe 41 Realize the communication of the second flow channel 55 of two adjacent heat exchangers 5, the communication of the third flow channel of two adjacent heat exchangers 5 can be realized through the third fluid pipe 32, Two adjacent heat exchangers 5 can realize the communication of the fourth flow channels of two adjacent heat exchangers 5 through the fourth fluid pipe 42 . Thus, when the battery pack 100 dissipates heat, the cooling liquid can flow to multiple heat exchangers 5 at the same time, so as to rapidly reduce the temperature of the battery pack 100 .

Furthermore, the first fluid pipeline 31 is not connected to the third fluid pipeline 32 , and the second fluid pipeline 41 is not connected to the fourth fluid pipeline 42 . In this way, the length of the flow channel can be shortened while realizing heat dissipation at the end of the battery pack 100 , thereby improving the structural strength of the heat exchanger 5 .

Optionally, the heat conduction member 6 may be heat conduction structural glue 7 , heat conduction silica gel or heat conduction silicone grease, but is not limited thereto. As long as the heat conducting member 6 is made of a high temperature resistant insulating material.

Optionally, the battery cell 21 may be a rechargeable secondary battery cell, such as a lithium iron phosphate battery cell or a ternary material battery cell, but is not limited thereto.

Optionally, the heat exchanger 5 can be a metal part such as an aluminum alloy part, and the metal heat exchanger can serve as a fireproof part, thereby improving the safety of the battery pack 100 in use.

According to some embodiments of the present utility model, an insulating layer is provided on the surface of the heat exchanger 5 to prevent electric current from being transmitted to the heat exchanger 5 when the electric core 21 leaks electricity. Wherein, an insulating layer can be formed on the surface of the heat exchanger 5 by spraying, electrophoresis or wrapping an insulating film.

According to some specific embodiments of the present invention, as shown in Figure 1, the tray 1 includes a body 11 and a cover 12, a plurality of battery packs 2 are arranged in the body 11, one side of the body 11 is open, and the cover 12 is arranged on The open side of the main body 11 and the cover 12 are connected to a plurality of battery packs 2 through structural glue 9 . Such setting ensures that multiple battery packs 2 are located in a closed space, and prevents liquid from entering into the containing cavity, thereby avoiding short circuit of the battery pack 100 and prolonging the service life of the battery pack 100 . Optionally, the material of the tray 1 can be aluminum alloy, copper or a composite material with high structural strength.

The vehicle (not shown) according to the embodiment of the third aspect of the utility model includes the battery pack 100 according to the embodiment of the second aspect of the utility model.

According to the vehicle of the embodiment of the present invention, by adopting the above-mentioned battery pack 100, the heat dissipation efficiency of the battery pack 100 can be improved, so that the charging rate of the battery pack 100 can be improved, and the charging rate of the vehicle can be further improved.

Other configurations and operations of the vehicle according to the embodiment of the present utility model are known to those skilled in the art and will not be described in detail here.

In describing the present invention, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "back", "left", The orientation or positional relationship indicated by "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of It is convenient to describe the utility model and simplify the description, but not to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the utility model.

In the description of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" is intended to mean that the implementation Specific features, structures, materials or characteristics described in an embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications, the scope of the present invention is defined by the claims and their equivalents.

Claims (15)

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.

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