Heat exchanger, battery pack, and vehicle

Abstract

A vehicle comprising a battery pack equipped with a heat exchanger. The heat exchanger includes a first heat exchange section and two second heat exchange sections. At least one first heat exchange flow channel is provided in the first heat exchange section, and at least one second heat exchange flow channel is provided in each second heat exchange section. The volume ratio of at least one second heat exchange flow channel in the second heat exchange section is larger than the volume ratio of the first heat exchange flow channel in the first heat exchange section.

Description

Technical Field

[0001] Cross - reference to Related Applications This application claims the priority and benefit of Chinese Patent Application No. 202222010868.2, filed on July 29, 2022, entitled "HEAT EXCHANGER, BATTERY PACK, AND VEHICLE", Chinese Patent Application No. 202222002100.0, filed on July 29, 2022, entitled "BATTERY DEVICE, BATTERY PACK, AND VEHICLE", and Chinese Patent Application No. 202222011268.8, filed on July 29, 2022, entitled "BATTERY PACK AND VEHICLE WITH BATTERY PACK". The entire disclosures of the above - mentioned applications are incorporated herein by reference.

[0002] The present disclosure relates to the technical field of batteries, and more particularly, to heat exchangers, battery packs, and vehicles.

Background Art

[0003] In the prior art, cells in a battery pack often have problems related to low heat dissipation efficiency and uneven heat dissipation among various components. Low heat dissipation efficiency, or different degrees of heat dissipation between cells, will lead to thermal expansion of some cells, which may limit the overall rapid charging ability of the battery pack. A high - rate rapid charging current strategy needs to be adjusted based on the temperature of the cells. An overly high local temperature of the cells limits the setting of the rapid charging means and thus limits the overall rapid charging ability. However, in the prior art, the cooling device of the battery pack cannot efficiently dissipate the heat in the main heat - generating area of the battery pack, cannot guarantee the temperature uniformity of the battery pack, and easily causes local overheating.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present disclosure aims to solve at least one of the technical problems in the prior art. Therefore, a first object of the present disclosure is to provide a heat exchanger having good heat exchange capacity.

[0005] A second object of the present disclosure is to provide a battery pack including the above-mentioned heat exchanger and cells.

[0006] A third object of the present disclosure is to provide a vehicle including the above-mentioned battery pack.

Means for Solving the Problems

[0007] The heat exchanger according to an embodiment in the first aspect of the present disclosure includes a first heat exchange section and two second heat exchange sections. The two second heat exchange sections are respectively connected to two ends of the first heat exchange section in the first direction. At least one first heat exchange flow channel is provided in the first heat exchange section. At least one second heat exchange flow channel is provided in the second heat exchange section. The volume proportion of the second heat exchange flow channel in at least one second heat exchange section is larger than the volume proportion of the first heat exchange flow channel in the first heat exchange section.

[0008] In the heat exchanger according to the present disclosure, the volume proportion of the second heat exchange flow channel in at least one second heat exchange section is larger than the volume proportion of the first heat exchange flow channel in the first heat exchange section, the heat exchange capacity of the second heat exchange section is higher than that of the first heat exchange section, and the heat exchange of the second heat exchange section is enhanced to facilitate intentionally improving the heat dissipation efficiency of the end portion of the cell.

[0009] In some embodiments, the volume proportion of the second heat exchange flow channel in each second heat exchange section is larger than the volume proportion of the first heat exchange flow channel in the first heat exchange section.

[0010] In some embodiments, a plurality of first heat exchange flow channels are provided, a plurality of second heat exchange flow channels are provided, and the number of the first heat exchange flow channels is less than the number of the second heat exchange flow channels of at least one second heat exchange section.

[0011] In some embodiments, a plurality of first heat exchange flow channels are provided, and a plurality of second heat exchange flow channels are provided. The plurality of first heat exchange flow channels are arranged in a second direction. The plurality of second heat exchange flow channels are arranged in the second direction. The second direction is perpendicular to the first direction.

[0012] In some embodiments, the structural strength of the first heat exchange section is higher than the structural strength of at least one second heat exchange section.

[0013] In some embodiments, a part of the first heat exchange section corresponding to at least one second heat exchange flow channel has a solid structure.

[0014] In some embodiments, the wall thickness of at least one first heat exchange flow channel is greater than the wall thickness of at least the second heat exchange flow channel.

[0015] In some embodiments, each second heat exchange flow channel and each first heat exchange flow channel extend along a straight line in the first direction.

[0016] In some embodiments, each first heat exchange section is joined to a corresponding second heat exchange section.

[0017] In some embodiments, the first heat exchange section and each second heat exchange section are respectively extrusion molded parts.

[0018] A battery pack according to an embodiment in the second aspect of the present disclosure includes a cell and a heat exchanger. The heat exchanger is the heat exchanger according to the above-described embodiment. The heat exchanger is configured to perform heat exchange with respect to the cell.

[0019] In some embodiments, the battery pack includes a cell unit. The cell unit includes a plurality of cell groups. Each cell group includes at least one cell. The battery pack includes a plurality of heat exchangers. The cell groups are alternately arranged with the heat exchangers in a third direction. The third direction is perpendicular to the first direction.

[0020] In some embodiments, the distance between two adjacent heat exchangers gradually increases from the center of the cell unit toward two ends of the cell unit in the third direction.

[0021] In some embodiments, the plurality of heat exchangers includes a first heat exchanger and a second heat exchanger. The first heat exchanger is provided with a first heat exchange inlet and a first heat exchange outlet. The second heat exchanger is provided with a second heat exchange inlet and a second heat exchange outlet. The cell groups have a first direction and a third direction perpendicular to each other. The first heat exchanger and the second heat exchanger are arranged in the third direction. The first heat exchange inlet and the second heat exchange outlet are installed at one end of the heat exchanger in the first direction, and the first heat exchange outlet and the second heat exchange inlet are installed at the other end of the heat exchanger in the first direction. The first heat exchanger is arranged on one side of the cell group in the third direction, and the second heat exchanger is arranged on the other side of the cell group in the third direction.

[0022] In some embodiments, the flow direction of the heat exchange fluid in the first heat exchanger is opposite to the flow direction of the heat exchange fluid in the second heat exchanger.

[0023] In some embodiments, the plurality of heat exchangers includes a plurality of first heat exchangers and a plurality of second heat exchangers. The battery pack includes a first connection pipe connected between the first heat exchange inlets of two adjacent first heat exchangers, a second connection pipe connected between the first heat exchange outlets of two adjacent first heat exchangers, a third connection pipe connected between the second heat exchange inlets of two adjacent second heat exchangers, and a fourth connection pipe connected to the second heat exchange outlet pipes of two adjacent second heat exchangers.

[0024] In some embodiments, the battery pack includes a first heat exchanger inlet pipe connected to the first heat exchange inlet of the first heat exchanger installed most outward in the third direction, a first heat exchanger outlet pipe connected to the first heat exchange outlet of the first heat exchanger installed most outward in the third direction, with the first heat exchanger outlet pipe and the first heat exchanger inlet pipe installed on the same side in the third direction, a second heat exchanger inlet pipe connected to the second heat exchange inlet of the second heat exchanger installed most outward in the third direction, and a second heat exchanger outlet pipe connected to the second heat exchange outlet of the second heat exchanger installed most outward in the third direction, with the second heat exchanger outlet pipe and the second heat exchanger inlet pipe installed on opposite sides in the third direction.

[0025] In some embodiments, the first heat exchanger is defined as having a thickness L1, the second heat exchanger is defined as having a thickness L2, and L1 and L2 satisfy 2 mm ≤ L1 ≤ 5 mm and 2 mm ≤ L2 ≤ 5 mm.

[0026] In some embodiments, the plurality of heat exchangers are arranged in a third direction. Each heat exchanger is provided with an inlet and an outlet at two ends in a first direction. The inlets of the plurality of heat exchangers are installed at the same end in the first direction and communicate with each other, and the outlets of the plurality of heat exchangers are installed at the other end in the first direction and communicate with each other.

[0027] In some embodiments, the battery pack further includes a plurality of connecting pipes. The connecting pipe installed at the inlet among the plurality of connecting pipes is a fluid input pipe. The connecting pipe installed at the outlet among the plurality of connecting pipes is a fluid output pipe. The heat exchanger communicates with both the fluid input pipe and the fluid output pipe.

[0028] In some embodiments, the battery pack further includes a heat conduction piece. The heat conduction piece is arranged between the heat exchanger and the cell group.

[0029] A vehicle according to an embodiment in the third aspect of the present disclosure includes a battery pack according to an embodiment in the second aspect.

[0030] Further aspects and advantages of the present disclosure will be provided in part in the following description, and some of them will be apparent from the following description or may be learned from practicing the present invention.

[0031] The above and / or further aspects and advantages of the present disclosure will become apparent and be readily understood from the following description of the embodiments with reference to the accompanying drawings.

Brief Description of the Drawings

[0032]

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Description of Reference Numerals

[0033] 1000 Battery pack 10 Cells 20 Heat exchanger 21a First heat exchange section 21b Second heat exchange section 211 First heat exchange flow channel 212 Second heat exchange flow channel 233 Inlet 234 Outlet 235 First confluence region 236 Second confluence region 237 Third confluence region 238 Fourth confluence region 5 Heat conduction sheet 36 Connection inlet pipe 37 Connection outlet pipe 35 Connection pipe 200 Cover plate 300 Tray 301 Accommodation cavity A First direction B Second direction C Third direction 1 Box body 3 Cell unit 31 Cell group 33 Fluid inlet pipe 34 Fluid outlet pipe 5 Heat conduction sheet 21 First heat exchanger 211 First heat exchange flow channel 216 First heat exchange inlet 213 First heat exchange outlet 214 First heat exchanger inlet pipe 215 First heat exchanger outlet pipe 22 Second heat exchanger 212 Second heat exchange flow channel 222 Second heat exchange inlet 223 Second heat exchange outlet 224 Second heat exchanger inlet pipe 225 Second heat exchanger outlet pipe 23 First connecting pipe 24 Second connecting pipe 25 Third connecting pipe 26 Fourth connecting pipe 51 First heat conduction piece 52 Second heat conduction piece 2000 Vehicle

Mode for Carrying Out the Invention

[0034] Embodiments of the present disclosure will be described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0035] A heat exchanger 20 according to an embodiment of the present disclosure will be described below with reference to FIGS. 1 to 20. The heat exchanger 20 includes a first heat exchange section 21a and two second heat exchange sections 21b. In some embodiments, the first direction A is the length direction of the heat exchanger 20, the second direction B is the width direction of the heat exchanger 20, the third direction C is the thickness direction of the heat exchanger 20, and the first direction A, the second direction B, and the third direction C are perpendicular to each other. The size of the heat exchanger 20 in the length direction is greater than or equal to the size in the width direction. The size of the heat exchanger 20 in the width direction is greater than or equal to the size in the thickness direction.

[0036] Specifically, as shown in FIGS. 2, 6, 18, and 19, two second heat exchange sections 21b of the heat exchanger 20 are respectively connected to two ends of the first heat exchange section 21a in the first direction A of the heat exchanger 20. At least one first heat exchange flow channel 211 is provided in the first heat exchange section 21a. At least one second heat exchange flow channel 212 is provided in the second heat exchange section 21b. The volume ratio of at least one second heat exchange flow channel 212 in at least one second heat exchange section 21b is larger than the volume ratio of at least one first heat exchange flow channel 211 in the first heat exchange section 21a. That is, the ratio of the total volume of all the second heat exchange flow channels 212 in at least one second heat exchange section 21b to the volume of the second heat exchange section 21b is larger than the ratio of the total volume of all the first heat exchange flow channels 211 in the first heat exchange section 21a to the volume of the first heat exchange section 21a.

[0037] The heat exchanger 20 has the second heat exchange flow channel 212 and the first heat exchange flow channel 211 provided therein. For example, there may be one second heat exchange flow channel 212 and one first heat exchange flow channel 211. The first heat exchange flow channel 211 faces the second heat exchange flow channel 212 in the first direction A. For example, when the volume of the second heat exchange section 21b is the same as the volume of the first heat exchange section 21a, the volume of the second heat exchange flow channel 212 may be increased so as to enable the volume of the second heat exchange flow channel 212 to be larger than the volume of the first heat exchange flow channel 211. As a result, the volume ratio of the second heat exchange flow channel 212 in the second heat exchange section 21b is larger than the volume ratio of the first heat exchange flow channel 211 in the first heat exchange section 21a, and the heat exchange capacity of the second heat exchange section 21b is higher than the heat exchange capacity of the first heat exchange section 21a.

[0038] It should be noted that the volume ratio of at least one second heat exchange flow channel 212 in the second heat exchange section 21b means the ratio of the sum of the volumes of all the second heat exchange flow channels 212 in the second heat exchange section 21b to the volume of the second heat exchange section 21b. The volume ratio of at least one first heat exchange flow channel 211 in the first heat exchange section 21a means the ratio of the sum of the volumes of all the first heat exchange flow channels 211 in the first heat exchange section 21a to the volume of the first heat exchange section 21a. The volume of the heat exchange flow channel (i.e., the first heat exchange flow channel 211 and the second heat exchange flow channel 212 described above) means the capacity of the heat exchange flow channel, that is, the flow rate of the refrigerant or cooling gas that can be accommodated in the heat exchange flow channel. A relatively large volume ratio of the second heat exchange flow channel 212 in the second heat exchange section 21b indicates that the space occupied by the second heat exchange flow channel 212 on the second heat exchange section 21b is relatively large, which can improve the heat exchange capacity of the second heat exchange section 21b. The terminals of the cell 10 are usually arranged at one or two ends of the cell 10, and the heat generated near the terminals of the cell 10 is often greater than the heat generated at other positions of the cell 10. The high heat exchange capacity of the second heat exchange section 21b can intentionally lower the temperature near the terminals of the cell 10. For example, when the positive and negative terminals of the cell 10 are arranged at the same end of the cell 10, the volume ratio of the second heat exchange flow channel 212 in the second heat exchange section 21b may be larger than the volume ratio of the first heat exchange flow channel 211 in the first heat exchange section 21a, and the second heat exchange section 21b is arranged adjacent to one end of the cell 10 where the terminals are installed. Therefore, in order to improve the heat dissipation efficiency, heat dissipation can be performed for the heat generation situations at various positions of the cell 10.Alternatively, when the positive and negative terminals of the cell 10 are respectively arranged at two ends of the cell 10, the volume ratios of the second heat exchange flow channels 212 in the two second heat exchange sections 21b may both be larger than the volume ratio of the first heat exchange flow channel 211 in the first heat exchange section 21a, and the two second heat exchange sections 21b are respectively arranged adjacent to the two ends of the cell 10 where the terminals are installed. Therefore, in order to improve the heat dissipation efficiency, heat dissipation can be performed for the heat generation situations at various positions of the cell 10.

[0039] In the heat exchanger 20 according to the embodiment of the present disclosure, the volume ratios of all the second heat exchange flow channels 212 in at least one second heat exchange section 21b are larger than the volume ratio of all the first heat exchange flow channels 211 in the first heat exchange section 21a, the ratio of the total volume of all the second heat exchange flow channels 212 to the volume of the second heat exchange section 21b is large, the total volume of the second heat exchange flow channels 212 is large, and also, the total flow rate flowing through the second heat exchange flow channels 212 is increased. As a result, the heat exchange capacity of the second heat exchange section 21b is higher than the heat exchange capacity of the first heat exchange section 21a, thereby strengthening the heat exchange of the second heat exchange section 21b. Therefore, when the heat exchanger 20 is arranged adjacent to at least one surface of the cell 10, the terminals of the cell are usually arranged at one end or two ends of the cell 10, and the heat generated at the positions of the terminals of the cell is larger than the heat generated at other positions of the cell 10. The second heat exchange section 21b at the end portion of the heat exchanger 20 may be arranged adjacent to the terminals of the cell 10 in order to intentionally improve the heat dissipation efficiency near the terminals of the cell.

[0040] In at least one of the two second heat exchange sections 21b, the ratio of the volume of all the second heat exchange flow channels 212 to the volume of the corresponding second heat exchange section 21b is greater than the ratio of the volume of all the first heat exchange flow channels 211 to the volume of the first heat exchange section 21a. For example, when it is necessary for one of the second heat exchange sections 21b of the heat exchanger 20 to have a high heat exchange capacity, the volume ratio of all the second heat exchange flow channels 212 in that one second heat exchange section 21b is greater than the volume ratio of all the first heat exchange flow channels 211 in the first heat exchange section 21a. At this time, the ratio of the volume of all the second heat exchange flow channels 212 to the volume of the other second heat exchange section 21b in the other second heat exchange section 21b is not limited and may be designed according to requirements. For example, in the other second heat exchange section 21b, the ratio of the volume of the second heat exchange flow channel 212 to the volume of the other second heat exchange section 21b may be equal to the ratio of the volume of all the first heat exchange flow channels 211 to the volume of the first heat exchange section 21a.

[0041] Furthermore, as shown in FIG. 6, the volume ratio of all the second heat exchange flow channels 212 in each second heat exchange section 21b is larger than the volume ratio of all the first heat exchange flow channels 211 in the first heat exchange section 21a. At this time, the volume ratios of all the second heat exchange flow channels 212 in the two second heat exchange sections 21b are both larger than the volume ratio of all the first heat exchange flow channels 211 in the first heat exchange section 21a, and the heat exchange capabilities of the two second heat exchange sections 21b are both higher than the heat exchange capability of the first heat exchange section 21a. Therefore, the volume ratio of all the second heat exchange flow channels 212 in each second heat exchange section 21b is larger than the volume ratio of all the first heat exchange flow channels 211 in the first heat exchange section 21a, and the heat exchange effects at the two ends of the heat exchanger 20 are good. In the case of the cell 10 where the positive terminal and the negative terminal are arranged at the two ends, when the heat exchanger 20 is arranged adjacent to at least one surface of the cell 10, the two second heat exchange sections 21b arranged at the end portions of the heat exchanger 20 may be respectively arranged adjacent to the two terminals at the two ends of the cell 10, thereby intentionally improving the heat dissipation efficiency near the terminals at the two ends of the cell 10. In other words, when the positive terminal and the negative terminal of the cell 10 are respectively arranged at the two ends of the cell 10, the two second heat exchange sections 21b are respectively arranged adjacent to the two ends of the cell 10 where the two terminals are installed, and heat dissipation is performed with respect to the heat generation situations at various positions of the cell 10, and the heat dissipation efficiency can be improved.

[0042] For example, when the volume of the first heat exchange section 21a is the same as the volume of the second heat exchange section 21b, the sum of the volumes of all the first heat exchange flow channels 211 is less than the sum of the volumes of all the second heat exchange flow channels 212. The total flow rate of the heat exchange fluid flowing through all the first heat exchange flow channels 211 is relatively small, and the total flow rate of the heat exchange fluid flowing through all the second heat exchange flow channels 212 is relatively large. As a result, the overall heat exchange effect of all the first heat exchange flow channels 211 is lower than the heat exchange effect of all the second heat exchange flow channels 212, and the heat exchange capacity of the first heat exchange section 21a is lower than the heat exchange capacity of the second heat exchange section 21b. Therefore, the total flow of the heat exchange fluid in all the second heat exchange flow channels 212 of the second heat exchange section 21b is more than the total flow of the heat exchange fluid in all the first heat exchange flow channels 211. As a result, the second heat exchange section 21b has good heat exchange capacity near the terminals of the cell 10.

[0043] To promote the smooth flow of the heat exchange fluid in the second heat exchange flow channel 212 to the first heat exchange flow channel 211 and to the second heat exchange flow channel 212 at the other end, a first confluence region 235 and a second confluence region 236 may be provided between the first heat exchange flow channel 211 and the second heat exchange flow channel 212. The first confluence region 235 and the second confluence region 236 communicate with both the first heat exchange flow channel 211 and the second heat exchange flow channel 212. In the first direction A of the heat exchanger 20, the first confluence region 235 and the second confluence region 236 may be defined by the first heat exchange section 21a and the second heat exchange section 21b of the heat exchanger 20, respectively. The structure corresponding to the first confluence region 235 and the second confluence region 236 in the heat exchanger 20 may be a cavity including two open ends in the first direction A of the heat exchanger 20. Both the first confluence region 235 and the second confluence region 236 communicate with the second heat exchange flow channel 212 and the first heat exchange flow channel 211. The heat exchange fluid in the plurality of second heat exchange flow channels 212 converges in the first convergence region 235 and flows into the first heat exchange flow channel 211. The heat exchange fluid flowing out of the first heat exchange flow channel 211 converges in the second convergence region 236 and flows out of the heat exchanger 20 from the second heat exchange flow channel 212 at the other end.

[0044] In some embodiments, as shown in FIGS. 6, 18, and 19, a plurality of first heat exchange flow channels 211 are provided, and a plurality of second heat exchange flow channels 212 are provided. In the description of the present disclosure, "multiple" means two or more. The number of the first heat exchange flow channels 211 is less than the number of the second heat exchange flow channels 212 in at least one end portion of the heat exchanger 20. That is, in the first direction A of the heat exchanger 20, the number of the first heat exchange flow channels 211 in the first heat exchange section 21a is less than the number of the second exchange flow channels 212 in the second heat exchange section 21b at one end, or the number of the first heat exchange flow channels 211 is less than the number of the second heat exchange flow channels 212 in the two second heat exchange sections 21b. For example, when the hole diameter of the first heat exchange flow channel 211 is the same as the hole diameter of the second heat exchange flow channel 212, the number of the first heat exchange flow channels 211 is less than the number of the second heat exchange flow channels 212 in at least one second heat exchange section 21b. The total flow rate of the heat exchange fluid flowing in the first heat exchange flow channel 211 is relatively small, the heat exchange efficiency of the first heat exchange section 21a is relatively low, and the second heat exchange flow channels 212 in the above-mentioned at least one second heat exchange section 21b have a relatively high heat dissipation efficiency. As a result, the heat exchange efficiency at the end portion of the heat exchanger 20 is relatively high. Therefore, a plurality of first heat exchange flow channels 211 and a plurality of second heat exchange flow channels 212 are provided, and the number of the first heat exchange flow channels 211 is less than the number of the second heat exchange flow channels 212 at at least one end of the heat exchanger 20. Therefore, the flow rate of the heat exchange fluid flowing through the second heat exchange section 21b at at least one end can be increased. When the terminals at the end portion of the cell 10 are arranged adjacent to the second heat exchange section 21b, the heat exchanger 20 can better take away the heat at the position near the terminals and achieve a good heat dissipation effect.When the heat exchanger 20 is applied to the battery pack, the positions near the terminals at the two ends of the cell 10 in the first direction are the main heat generation regions, and the heat generated at the center of the cell 10 is relatively less. Therefore, the heat dissipation efficiency at the two ends of the cell 10 in the first direction can be improved, and the temperature of the cell 10 can be rapidly adjusted by increasing the number of heat exchange flow channels installed at the two ends of the heat exchanger 20 in the first direction. In the case of the center of the heat exchanger 20 including a small number of heat exchange flow channels, the structural strength of the heat exchanger 20 can be improved while ensuring the heat dissipation efficiency at the center of the heat exchanger 20.

[0045] In some embodiments, in combination with FIGS. 6, 18, and 19, when a plurality of first heat exchange flow channels 211 and a plurality of second heat exchange flow channels 212 are provided, the plurality of first heat exchange flow channels 211 are arranged in the second direction B, the second heat exchange flow channels 212 are arranged in the second direction B, and the second direction B is perpendicular to the first direction A. Therefore, the plurality of first heat exchange flow channels 211 and the plurality of second heat exchange flow channels 212 are arranged in the second direction B, that is, the width direction of the heat exchanger 20, in order to enhance the heat exchange effect of the heat exchanger 20 in the second direction B and increase the heat exchange area of the heat exchanger 20. For example, when the heat exchanger 20 is configured to dissipate heat on a cell group including at least one cell 10, the cell group and the heat exchanger 20 are arranged in the third direction C, and the heat exchange flow channels provided in the second direction B can increase the contact area with the cell 10, and more heat can be taken away. Therefore, the plurality of first heat exchange flow channels 211 and the plurality of second heat exchange flow channels 212 are arranged in the second direction B, which can increase the heat exchange area of the heat exchanger 20, optimize the distribution of the flow channels in the heat exchanger 20 in the second direction B, and improve the uniformity of heat dissipation and the heat exchange efficiency.

[0046] In some embodiments, the structural strength of the first heat exchange section 21a is higher than that of the second heat exchange section 21b. For example, when the hole diameter of the first heat exchange flow channel 211 is the same as the hole diameter of the second heat exchange flow channel 212, a relatively small number of the first heat exchange flow channels 211 are provided in the first heat exchange section 21a. As a result, the ratio of the sum of the volumes of the plurality of first heat exchange flow channels 211 to the volume of the first heat exchange section 21a is relatively small, which can relatively improve the structural strength of the first heat exchange section 21a. Therefore, the structural strength of the first heat exchange section 21a is higher than that of the second heat exchange section 21b. As a result, the first heat exchange section 21a has good deformation resistance. When the heat exchanger 20 is disposed adjacent to at least one surface of the cell 10, particularly when the heat exchanger 20 is disposed adjacent to a large surface of the cell 10 (i.e., the surface having the largest area among all the surfaces of the cell), the central position of the large surface of the cell is the surface having the highest expansion potential and / or the highest degree of expansion during the use of the cell 10. As a result, the structural strength of the first heat exchange section 21a at the center of the heat exchanger 20 is higher than that of the second heat exchange section 21b at the end portion, the expansion of the cell 10 can be suppressed, and the stability of the cell 10 and the heat exchanger 20 can be improved.

[0047] In some cases, a part of the first heat exchange section 21a corresponding to at least one second heat exchange flow channel 212 has a solid structure. For example, the number of the first heat exchange flow channels 211 included in the first heat exchange section 21a is less than the number of the second heat exchange flow channels 212. In the first direction A, the first heat exchange flow channels 211 are in one-to-one correspondence with at least a part of the second heat exchange flow channels 212, and the other parts of the second heat exchange flow channels 212 may face the connection part between two adjacent first heat exchange flow channels 211 to reduce the density of the first heat exchange flow channels 211. When a part of the first heat exchange section 21a has a solid structure, the structural strength of the first heat exchange section 21a can be improved, the deformation resistance of the first heat exchange section 21a can be improved, or when a part of the first heat exchange section 21a has a closed hollow structure, the weight of the heat exchanger 20 can be reduced, and a lightweight heat exchanger 20 can be obtained. Therefore, a part of the first heat exchange section 21a has a solid structure, and the structural strength of the first heat exchange section 21a can be improved. As a result, the heat exchanger 20 can better suppress, for example, the expansion of the cell 10 and improve the structural strength of the heat exchanger 20.

[0048] In some embodiments, the thickness of at least one first heat exchange flow channel 211 is greater than the thickness of at least one second heat exchange flow channel 212. For example, the number of the first heat exchange flow channels 211 is relatively small, and accordingly, the distance between two adjacent first heat exchange flow channels 211 increases, or the distance between the first heat exchange flow channel 211 and the surface of the heat exchanger 20 in the first direction A increases. The thickness of the first heat exchange flow channel 211 in the first direction A increases, which can be understood as the distance between the central axes of two adjacent first heat exchange flow channels 211 increasing when the hole diameter of the first heat exchange flow channel 211 does not change. Therefore, the thickness of at least one first heat exchange flow channel 211 is greater than the thickness of at least one second heat exchange flow channel 212, which can improve the structural strength of the first heat exchange section 21a.

[0049] According to some embodiments of the present disclosure, the heat exchanger 20 is defined as having a thickness D in a third direction, and D satisfies 2 mm ≤ D ≤ 5 mm. When D is less than 2 mm, the thickness of the heat exchanger 20 is relatively small. As a result, the structural strength of the heat exchanger 20 is relatively low, and the heat exchanger 20 tends to deform during installation and use, which affects the heat dissipation efficiency of the battery pack to which the heat exchanger 20 is applied. When D is greater than 5 mm, the thickness of the heat exchanger 20 is relatively large. As a result, the volume of the battery pack will increase, and the volume utilization rate of the battery pack will decrease. Therefore, when the thickness D of the heat exchanger 20 ranges from 2 mm to 5 mm, the structural strength of the heat exchanger 20 can be guaranteed, the deformation of the heat exchanger 20 can be avoided, while the heat dissipation efficiency of the battery pack can be guaranteed, and the volume utilization rate of the battery pack can be guaranteed.

[0050] In some embodiments, as shown in FIGS. 6 and 18 to 19, each second heat exchange flow channel 212 and each first heat exchange flow channel 211 extend along a straight line in the first direction A. Accordingly, the first heat exchange flow channel 211 and the second heat exchange flow channel 212 extend in the first direction A, and the flow rate of the heat exchange fluid used to exchange heat inside the flow channel can be increased. As a result, the heat exchange fluid can more rapidly reduce the heat on the second heat exchange section 21b, and the use safety of the heat exchanger 20 can be improved.

[0051] In some embodiments, in combination with FIGS. 6, 18, and 19, the heat exchanger 20 is formed by joining a first heat exchange section 21a and a corresponding second heat exchange section 21b. For example, the first heat exchange section 21a and the second heat exchange section 21b may be individually manufactured, and the connection surfaces of the second heat exchange section 21b and the first heat exchange section 21a may be welded to each other through a welding process such that the first heat exchange flow channel 211 communicates with the second heat exchange flow channel 212. In some embodiments, as shown in FIG. 6, a third confluence region 237 and a fourth confluence region 238 are respectively provided at the ends of two second heat exchange sections 21b that are far from the first heat exchange section 21a. The third confluence region 237 and the fourth confluence region 238 may be respectively defined by the ends of two second heat exchange sections 21b that are separated from each other. The third confluence region 237 and the fourth confluence region 238 are cavities having two open ends in the first direction A. One end of the third confluence region 237 and one end of the fourth confluence region 238 that are far from the second heat exchange section 21b communicate with the outside. The third confluence region 237 and the fourth confluence region 238 are welded to the ends of two second heat exchange sections 21b that are separated from each other. The third confluence region 237 and the fourth confluence region 238 can reduce the flow velocity of the heat exchange fluid, and at the same time, ensure a sufficient flow rate of the heat exchange fluid entering the plurality of second heat exchange flow channels 212, and can improve the heat exchange efficiency. The heat exchange fluid flowing out of the second heat exchange flow channel 212 may first converge and then flow out. As a result, the time of the heat exchange fluid in the heat exchange flow channel can be extended, and the outflow velocity of the heat exchange fluid can be reduced. The heat exchange fluid entering the heat exchanger 20 can flow sequentially through the third confluence region 237, one second heat exchange flow channel 212, the first confluence region 235, the first heat exchange flow channel 211, the second confluence region 236, and the other second heat exchange flow channel 212, and flow out from the fourth confluence region 238.

[0052] Therefore, the first heat exchange section 21a and the corresponding second heat exchange section 21b are joined to form the heat exchanger 20, which can reduce the problems in the manufacturing process of the heat exchanger 20 and improve the assembly efficiency of the heat exchanger 20.

[0053] Optionally, the first heat exchange section 21a and the second heat exchange section 21b are each an extruded part. Therefore, the first heat exchange section 21a and the second heat exchange section 21b are manufactured through an extrusion process, which can effectively reduce the manufacturing cost of the heat exchanger 20, improve the utilization rate of the materials for manufacturing the heat exchanger 20, and improve the manufacturing efficiency and product yield.

[0054] Optionally, as shown in FIG. 7, the second heat exchange flow channel 212 or the first heat exchange flow channel 211 inside the heat exchanger 20 may be spaced apart in the second direction B of the heat exchanger 20 and may also extend in the first direction A of the heat exchanger 20, thereby increasing the heat exchange area and improving the heat exchange capacity of the heat exchanger 20.

[0055] A battery pack 1000 according to an embodiment of the second aspect of the present disclosure includes a cell unit 3 and at least one heat exchanger 20. The heat exchanger 20 is the heat exchanger 20 according to any embodiment of the above-described aspects of the present disclosure.

[0056] In some embodiments, the cell unit 3 includes a plurality of cell groups 31. Each cell group 31 includes at least one cell 10. The heat exchanger 20 is configured to perform heat exchange with the cells 10. The battery pack 1000 includes a plurality of heat exchangers 20. The cell groups 31 are alternately arranged with the heat exchangers 20 in the third direction C of the heat exchanger 20. The third direction C is perpendicular to the first direction A. Here, each cell group 31 including one cell 10 is regarded as an example here, that is, the heat exchangers 20 arranged on two sides of each cell 10 in the third direction C are regarded as examples.

[0057] Exemplarily, in combination with FIGS. 1 to 20, the heat exchanger 20 and the cell 10 are arranged alternately in order in the third direction C of the heat exchanger 20. The number of the first heat exchange flow channels 211 included in each heat exchanger 20 is less than the number of the second heat exchange flow channels 212, and the volume ratio of the second heat exchange flow channels 212 in each second heat exchange section 21b is larger than the volume ratio of the first heat exchange flow channels 211 in the first heat exchange section 21a. When the hole diameter of the first heat exchange flow channel 211 is the same as the hole diameter of the second heat exchange flow channel 212, the number of the first heat exchange flow channels 211 is relatively small, and as a result, the structural strength of the corresponding first heat exchange section 21a is higher than the structural strength of the second heat exchange section 21b. The central position of the large surface of the cell is the surface having the highest expansion possibility and / or the highest degree of expansion during the use of the cell 10. As a result, the heat exchanger 20 can effectively suppress the deformation of the cell 10 when the cell 10 is deformed by heat, and can extend the service life of the cell 10. The flow directions of the heat exchange fluids inside the plurality of heat exchangers 20 are the same, which can improve the heat dissipation efficiency of the plurality of cells 10.

[0058] Optionally, the distance between two adjacent heat exchangers 20 gradually increases from the center of the cell unit 3 towards the two ends of the cell unit 3 in the third direction.

[0059] The distance between two adjacent heat exchangers 20 that gradually increases toward two ends of the cell unit 3 in the third direction from the center of the cell unit 3 means that the distance between two adjacent heat exchangers 20 tends to increase toward two ends of the cell unit 3 in the third direction from the center of the cell unit 3, for example, it may gradually increase. For example, in the example of FIG. 10, the distance between two adjacent heat exchangers 20 that gradually increases toward two ends of the cell unit 3 in the third direction from the center of the cell unit 3 is such that, from the center of the cell unit 3 toward two ends of the cell unit 3 in the third direction, the distance between the first cell group 31 and the second cell group 31 is less than the distance between the second cell group 31 and the third cell group 31, and the distance between the second cell group 31 and the third cell group 31 is less than the distance between the third cell group 31 and the fourth cell group 31, and so on. Alternatively, the distance between two adjacent heat exchangers 20 may increase irregularly toward two ends of the cell unit 3 in the third direction from the center of the cell unit 3. For example, from the center of the cell unit 3 toward two ends of the cell unit 3 in the third direction, the distance between the first cell group 31 and the second cell group 31 is equal to the distance between the second cell group 31 and the third cell group 31, the distance between the second cell group 31 and the third cell group 31 is less than the distance between the third cell group 31 and the fourth cell group 31, and the distance between the third cell group 31 and the fourth cell group 31 is less than the distance between the fourth cell group 31 and the fifth cell group 31, and so on.

[0060] The cell 10 installed in the central region of the battery pack 1000 in the third direction has insufficient heat dissipation capacity. The heat exchangers 20 and the cell groups 31 are arranged alternately, and the density of the heat exchangers 20 installed at the center of the battery pack 1000 in the third direction is set to be relatively large so that while rapidly lowering the temperature of the battery pack 1000, the heat dissipation efficiency of the battery pack 1000 can be improved, the number of heat exchangers 20 can be reduced, and the cost of the battery pack 1000 can be reduced.

[0061] When the temperature of the battery pack 1000 rises, the refrigerant enters the heat exchanger 20 through the heat exchange fluid inlet, exchanges heat with the cell 10 in the heat exchanger 20 to lower the temperature of the cell 10, and after the heat exchange, the refrigerant flows out of the heat exchanger 20 through the heat exchange fluid outlet. Therefore, heat dissipation of the cell 10 is achieved.

[0062] For example, in the examples of FIGS. 9 and 10, the battery pack 1000 further includes a box body 1. The cell unit 3 is disposed within the box body 1. The shape of the box body 1 is approximately rectangular. The manufacturing material of the box body 1 may be a metallic material such as an aluminum alloy or steel so that the cell unit 3 within the box body 1 can be sufficiently protected, or may be a high-strength composite material. Four side walls of the box body 1 that are connected to each other together define an accommodation cavity 301, and the cell unit 3 is disposed within the accommodation cavity 301.

[0063] According to some embodiments of the present disclosure, the cell 10 has a length direction, a width direction, and a thickness direction that are perpendicular to each other. The size of the cell 10 in the length direction is greater than or equal to the sizes of the cell 10 in the width direction and the thickness direction. The size of the cell 10 in the width direction is greater than or equal to the size of the cell 10 in the thickness direction. The thickness direction of the cell 10 is the third direction, the length direction of the cell 10 is the first direction, and the width direction of the cell 10 is the second direction.

[0064] In the example shown in FIG. 1, the battery pack 1000 further includes a tray 300 and a cover plate 200. The cell 10 and the heat exchanger 20 are installed within an accommodation cavity 301 defined by the tray 300. The cover plate 200 surrounds the accommodation cavity 301. Optionally, cooling plates may be disposed on two sides of the heat exchanger 20 in the second direction B to enhance heat dissipation of two side surfaces of the cell 10 in the second direction B.

[0065] The battery pack 1000 according to an embodiment of the present disclosure includes the heat exchanger 20 according to any one of the above-described embodiments, which can improve the heat dissipation ability of the battery pack 1000 and improve the use safety of the battery pack 1000. The battery pack 1000 may be applied to a vehicle. In the following description of the present disclosure, the battery pack 100 applied to a vehicle is regarded as an example for explanation.

[0066] In some embodiments, as shown in FIGS. 2 and 5, the heat exchanger 20 is arranged in a third direction C. Each heat exchanger 20 is provided with an inlet 233 and an outlet 234 at two ends in a first direction A. It can be understood that the inlet 233 is the heat exchange fluid inlet of the heat exchanger 20, and the outlet 234 is the heat exchange fluid outlet of the heat exchanger 20. For example, in combination with FIGS. 2, 5, and 6, the inlet 233 may be provided in one of the third confluence region 237 and the fourth confluence region 238, and the outlet 234 may be provided in the other of the third confluence region 237 and the fourth confluence region 238. The inlets 233 of the plurality of heat exchangers 20 are installed at the same end of the heat exchanger 20 in the first direction A and communicate with each other, and the outlets 234 of the plurality of heat exchangers 20 are installed at the other end of the heat exchanger 20 in the first direction A and communicate with each other. In the first direction A, two adjacent inlets 233 and two adjacent outlets 234 communicate with each other through a connecting pipe 35 respectively. For example, in combination with FIGS. 2, 5, 6, and 9, the connecting pipe 35 at the inlet 233 may be called a fluid input pipe 33, and the connecting pipe 35 at the outlet 234 may be called a fluid output pipe 34. The number of fluid input pipes 33 is one or more, and the number of fluid output pipes 34 is one or more. The heat exchanger 20 communicates with both the fluid input pipe 33 and the fluid output pipe 34. Specifically, the fluid input pipe 33 of the heat exchanger 20 communicates with the heat exchange fluid inlet, and the fluid output pipe 34 of the heat exchanger 20 communicates with the heat exchange fluid outlet. When the battery pack 1000 is charged, the cell 10 generates heat. The refrigerant flows into the heat exchange fluid inlet through the fluid input pipe 33 and enters the heat exchanger 20. The refrigerant flows through the end portion and the center of the cooling flow channel and exchanges heat with the heat generated by the cell 10 in the heat exchange flow channel to lower the temperature of the cell 10. Subsequently, after heat exchange, the refrigerant flows out from the heat exchange fluid outlet and out of the heat exchanger 20 through the fluid output pipe 34. Further, the heat exchanger 20 is connected to the adjacent heat exchanger 20 through the fluid input pipe 33 and the fluid output pipe 34 so that the refrigerant can enter the plurality of heat exchangers 20 through the heat exchange fluid inlet and finally flow into the refrigerant storage device through the fluid output pipe 34.Therefore, to dissipate the heat of the cell 10, a complete heat exchange cycle is completed.

[0067] The cell 1000 includes a connection inlet pipe 36 and a connection outlet pipe 37. On the outermost heat exchanger 20, the connection inlet pipe 36 is connected to the inlet 233 of the heat exchanger 20, and the connection outlet pipe 37 is connected to the outlet 234 of the heat exchanger 20. As a result, the heat exchanger 20 can communicate with an external system. For example, the fluid input pipe 33 and the fluid output pipe 34 on the outermost heat exchanger 20 may communicate with the refrigerant storage device through the connection inlet pipe 36 and the connection outlet pipe 37 respectively. The high-temperature heat exchange fluid flowing out from the connection outlet pipe 37 can form a low-temperature heat exchange fluid that flows into the heat exchanger 20 from the connection inlet pipe 36 through the external system and dissipates heat to the cell 10. The flow directions of the heat exchange fluids inside the plurality of heat exchangers 20 are the same. For example, it flows from the left side to the right side shown in FIG. 5 in the first direction A of the heat exchanger 20. The flow directions of the heat exchange fluids inside the plurality of heat exchangers 20 are not limited here, and the heat exchange fluid may flow from the right side to the left side instead.

[0068] Therefore, each heat exchanger 20 is provided with an inlet 233 and an outlet 234. The plurality of inlets 233 communicate with each other. The plurality of outlets 234 communicate with each other. The heat exchange fluid entering the interior of the heat exchanger 20 enters from the inlets 233 of the plurality of heat exchangers 20 and flows out from the outlets 234 of the plurality of heat exchangers 20, achieving simultaneous heat dissipation of the plurality of cells 10 and improving the heat dissipation efficiency of the cells 10.

[0069] In some embodiments, as shown in FIGS. 3, 9, and 12, the battery pack 1000 further includes a heat conduction sheet 5. The heat conduction sheet 5 is disposed between the heat exchanger 20 and the cell group 31. In the third direction C of the heat exchanger 20, the heat exchanger 20 is disposed on two sides of the cell 10, and the heat conduction sheet 5 can be disposed between the heat exchanger 20 and the cell 10 to facilitate transferring the heat generated by the cell 10 to the heat exchanger 20. The heat conduction sheet 5 may be coated or filled between the heat exchanger 20 and the cell 10. Further, the heat conduction sheet 5 is a heat conductive structural adhesive, heat conductive silicone, or heat conductive silicone grease, but is not limited thereto as long as the material for manufacturing the heat conduction sheet 5 is a high temperature resistant insulating material. The heat conduction sheet 5 may have bonding properties to facilitate the mounting between the cell 10 and the heat exchanger 20 while dissipating the heat of the cell 10 in contact with the heat conduction sheet 5. The heat conduction sheet 5 further has insulating properties and high temperature resistance, and the heat conduction sheet 5 has good heat conduction properties, which can improve the heat dissipation ability of the cell 10 and improve the structural strength and stability of the battery pack 1000. Therefore, the heat conduction sheet 5 is disposed between the heat exchanger 20 and the cell group 31, which strengthens the thermal conductivity between the cell 10 and the heat exchanger 20 so that the heat on the cell 10 can be transmitted to the heat exchanger 20 as much as possible, and can improve the heat exchange ability of the heat exchanger 20 through the heat conduction sheet 5. Therefore, the heat dissipation efficiency of the cell 10 can be improved, the good performance of the cell 10 can be maintained, and the heat dissipation efficiency of the battery pack 1000 can be further improved.

[0070] According to some embodiments of the present disclosure, an insulating layer is provided on the surface of the heat exchanger 20. The insulating layer may form an insulating film in a manner of insulating treatment such as spraying, electrophoresis, or coating an insulating film. The arrangement of the insulating layer can prevent the current from being transmitted to the heat exchanger 20 when the cell 10 leaks electricity. Optionally, the heat exchanger 20 may be a harmonica-shaped tube, a punched and brazed cooling plate, or other forms of cooling plates. The heat exchanger 20 may be an aluminum alloy component.

[0071] Optionally, the cell 10 may be a rechargeable secondary cell, such as a lithium iron phosphate cell or a ternary material cell. The terminals of the cell 10 may be drawn from the first direction of the cell 10 or from the second direction of the cell 10. That is, the terminals can be arranged on the same side or different sides of the cell 10.

[0072] According to some embodiments of the present disclosure, the battery pack 1000 further includes a refractory sheet. The refractory sheet is disposed on at least a portion of two opposing side surfaces of the cell group 31 in the first direction and two opposing side surfaces in the second direction. For example, the refractory sheet may be disposed on the surface of the cell group 31 that is not in contact with the heat conduction sheet 5 and the heat exchanger 20. The use of the refractory sheet can prevent risks such as ignition of the battery pack 1000 caused by excessive high temperature, and guarantee the use safety of the battery pack 1000.

[0073] According to some embodiments of the present disclosure, the first direction A is the length direction of the cell 10, the second direction B is the width direction of the cell 10, the third direction A is the thickness direction of the cell 10, and the third direction C, the second direction B, and the first direction A are perpendicular to each other. The size of the cell 10 in the length direction is defined as L, the size of the cell 10 in the width direction is defined as W, the size of the cell 10 in the thickness direction is defined as D, and L, W, and D satisfy L≧W≧D.

[0074] For example, as shown in FIGS. 12 to 14, a plurality of cell groups 31 are arranged in the third direction C. The plurality of heat exchangers 20 includes a first heat exchanger 21 and a second heat exchanger 22. The first heat exchanger 21 is provided with a first heat exchange inlet 216 and a first heat exchange outlet 213. The second heat exchanger 22 is provided with a second heat exchange inlet 222 and a second heat exchange outlet 223. The cell group 31 has a third direction C and a first direction A that are perpendicular to each other. The first heat exchanger 21 and the second heat exchanger 22 are arranged in the third direction C. The first heat exchange inlet 216 and the second heat exchange outlet 223 are installed at one end of the heat exchanger 20 in the first direction A, and the first heat exchange outlet 213 and the second heat exchange inlet 222 are installed at the other end of the heat exchanger 20 in the first direction A. The first heat exchanger 21 is arranged on one side of each cell group 31 in the third direction C, and the second heat exchanger 22 is arranged on the other side in the third direction C. Here, each cell group 31 including one cell 10 is regarded as an example.

[0075] In combination with FIGS. 12 to 15, the adjacent first heat exchanger 21 and second heat exchanger 22 are spaced apart from each other. The first heat exchanger 21 and the second heat exchanger 22 may operate independently. The first heat exchanger 21 and the second heat exchanger 22 are respectively arranged on two sides of the cell 10 in the third direction C. The first heat exchange inlet 216 and the second heat exchange inlet 222 are respectively installed at two ends of the heat exchanger 20 in the third direction C. Therefore, the heat exchange fluid can enter the first heat exchanger 21 and the second heat exchanger 22 from different directions.

[0076] Furthermore, in combination with FIGS. 15, 18, and 19, for example, the heat exchange fluid enters the heat exchange flow channel from the second heat exchange inlet 222. A portion of the cell 10 adjacent to the second heat exchange inlet 222 rapidly dissipates heat, and a portion far from the second heat exchange inlet 222 slowly dissipates heat. The heat exchange fluid takes away the heat of the portion of the cell 10 adjacent to the second heat exchange inlet 222, resulting in a temperature rise of the heat exchange fluid. Thus, the temperature difference between the heat exchange fluid and the portion of the cell 10 far from the second heat exchange inlet 222 is reduced, and the heat taken away by the heat exchange fluid from the portion of the cell 10 adjacent to the second heat exchange inlet 222 is limited. As a result, the heat dissipation effect of the portion of the cell 10 adjacent to the second heat exchange inlet 222 is insufficient. Therefore, various positions of the cell 10 have various heat dissipation effects. The heat exchange fluid flowing into the heat exchanger 20 from the first heat exchange inlet 212 installed on the other side can take away the heat dissipated by the above-mentioned portion of the cell 10 having an insufficient heat dissipation effect. As a result, the heat dissipation capabilities of the two ends of the cell 10 in the first direction A are the same, and the influence of the heat absorbed by the flowing heat exchange fluid on the heat dissipation effect is reduced.

[0077] Therefore, through the arrangement, to promote the entry of the heat exchange fluid from the two ends in the first direction A into the first heat exchanger 21 and the second heat exchanger 22 for simultaneous heat dissipation of the two ends of the cell 10 in the first direction A and the two sides in the third direction C, thereby improving the heat dissipation efficiency of the cell 10, to achieve balanced heat dissipation of the cell 10 in the third direction C and improve the heat dissipation capacity of the battery device 100, the first heat exchanger 21 and the second heat exchanger 22 are respectively arranged on the two opposite sides of the cell 10 in the third direction, and the inlets of the first heat exchanger 21 and the second heat exchanger 22 are respectively installed at the two ends in the first direction A.

[0078] In some embodiments, the first heat exchanger 21 does not communicate with the second heat exchanger 22. Thus, the heat dissipation efficiency of the two ends of the cell 10 in the first direction A can be improved.

[0079] In some embodiments, as shown in FIGS. 17 to 19, the flow direction of the heat exchange fluid in the first heat exchanger 21 is opposite to the flow direction of the heat exchange fluid in the second heat exchanger 22. For example, in the first direction A of the cell 10, the heat exchange fluid inside the second heat exchanger 22 may flow from left to right, and the heat exchange fluid inside the first heat exchanger 21 may flow from right to left. Therefore, the flow directions of the heat exchange fluids in the first heat exchanger 21 and the second heat exchanger 22 are opposite. The heat dissipation rate of the cell 10 on the two sides of the cell 10 can be increased, and the uneven heat dissipation at the two ends of the cell 10 in the third direction C caused by the fact that the heat exchange fluids on the two sides of the cell 10 flow in the same direction can be avoided. As a result, the possibility of thermal expansion of a part of the cell 10 caused by uneven heat dissipation can be reduced, the battery device 100 has a more efficient heat dissipation capacity, and the use safety and reliability of the battery device 100 are improved.

[0080] In some embodiments, as shown in FIGS. 18 and 19, each first heat exchanger 21 extends in the first direction A, and each first heat exchanger 21 is provided therein with a first heat exchange flow channel 211 and a second heat exchange flow channel 212 that extend in the first direction A. Each second heat exchanger 22 extends in the first direction A, and each second heat exchanger 22 is provided therein with a first heat exchange flow channel 211 and a second heat exchange flow channel 212 that extend in the first direction A. Therefore, the first heat exchange flow channel 211 and the second heat exchange flow channel 212 are provided in the first heat exchanger 21 and the second heat exchanger 22, which can promote the flow of the heat exchange fluid in the heat exchange flow channel to take away the heat of the cell 10 transmitted to the heat exchanger in order to achieve the heat dissipation of the cell 10 and guarantee the use safety of the battery device 100.

[0081] Furthermore, in combination with FIGS. 16 to 19, a plurality of first heat exchange flow channels 211 are provided. The plurality of first heat exchange flow channels 211 are spaced apart in the second direction B. A plurality of second heat exchange flow channels 212 are provided. The plurality of second heat exchange flow channels 212 are spaced apart in the second direction B. Accordingly, the plurality of first heat exchange flow channels 211 and the plurality of second heat exchange flow channels 212 are provided, and the plurality of first heat exchange flow channels 211 and the plurality of second heat exchange flow channels 212 are each spaced apart in the second direction B. As a result, the flow regions of the heat exchange fluid in the first heat exchange flow channels 211 and the second heat exchange flow channels 212 can be increased, the flow velocities of the heat exchange fluid in the first heat exchange flow channels 211 and the second heat exchange flow channels 212 can be decreased, and the flow time of the heat exchange fluid in the heat exchange flow channels can be extended. This promotes the heat dissipated by the cell 10 to be taken away by the heat exchange fluid, thereby lowering the temperature of the cell 10.

[0082] Furthermore, as shown in FIGS. 18 and 19, in the first heat exchanger 21, the volume ratio of the plurality of first heat exchange flow channels 211 in the first heat exchange section 21a is smaller than the volume ratio of the plurality of second heat exchange flow channels 212 in the second heat exchange section 21b. In the second heat exchanger 22, the volume ratio of the plurality of first heat exchange flow channels 211 in the first heat exchange section 21a is smaller than the volume ratio of the plurality of second heat exchange flow channels 212 in the second heat exchange section 21b. In other words, in the first heat exchanger 21, the ratio of the total volume of the plurality of first heat exchange flow channels 211 in the first heat exchange section 21a to the volume of the first heat exchange section 21a is smaller than the ratio of the total volume of all the second heat exchange flow channels 212 in the second heat exchange section 21b to the volume of the second heat exchange section 21b. In the second heat exchanger 22, the ratio of the total volume of the plurality of first heat exchange flow channels 211 in the first heat exchange section 21a to the volume of the first heat exchange section 21a is smaller than the ratio of the total volume of all the second heat exchange flow channels 212 in the second heat exchange section 21b to the volume of the second heat exchange section 21b. In each of the first heat exchanger 21 and the second heat exchanger 22, the total flow rate of the first heat exchange flow channels 211 in the first heat exchange section 21a is less than the total flow rate of the second heat exchange flow channels 212 in the second heat exchange section 21b. For example, in the case of the cell 10 having a positive terminal and a negative terminal arranged at two ends, the two second heat exchange sections 21b arranged at the end portions of the heat exchanger 20 are respectively arranged adjacent to the two terminals at the two ends of the cell 10, thereby intentionally increasing the heat dissipation efficiency near the two terminals of the cell 10. Therefore, the heat exchange capacity of each of the first heat exchange sections 21a of the first heat exchanger 21 and the second heat exchanger 22 is lower than the heat exchange capacity of each of the second heat exchange sections 21b of the first heat exchanger 21 and the second heat exchanger 22. As a result, the two end portions of the heat exchanger 20 in the first direction A have a good heat dissipation effect near the terminals of the cell 10.

[0083] In some embodiments, in each of the first heat exchanger 21 and the second heat exchanger 22, the structural strength of the first heat exchange section 21a is higher than that of at least one second heat exchange section 21b. For example, in the first heat exchanger 21 and the second heat exchanger 22, when the hole diameter of the first heat exchange flow channel 211 is the same as that of the second heat exchange flow channel 212, a relatively small number of the first heat exchange flow channels 211 are provided in the first heat exchange section 21a. As a result, the ratio of the sum of the volumes of the plurality of first heat exchange flow channels 211 to the volume of the first heat exchange section 21a is reduced, and the structural strength of the first heat exchange section 21a can be relatively improved. Therefore, the structural strength of the first heat exchange section 21a is higher than that of the second heat exchange section 21b. As a result, the first heat exchange section 21a has good deformation resistance. When the heat exchanger 20 is disposed adjacent to one surface of the cell 10, particularly when the heat exchanger 20 is disposed adjacent to a large surface of the cell 10 (i.e., the surface having the largest area among all the surfaces of the cell 10), the central position of the large surface of the cell is the surface having the highest expansion potential and / or the highest degree of expansion during the use of the cell 10. As a result, the structural strength of the first heat exchange section 21a installed at the center of the heat exchanger 20 is higher than that of the second heat exchange section 21b at the end portion, the expansion of the cell 10 can be suppressed, and the stability of the cell 10 and the heat exchanger 20 can be improved.

[0084] According to some embodiments of the present disclosure, in the first heat exchanger 21 and the second heat exchanger 22, the wall thickness of the first heat exchange flow channel 211 of at least one first heat exchange section 21a is greater than the wall thickness of the second heat exchange flow channel 212 of at least one second heat exchange section 21b. That is, in the first heat exchanger 21 and the second heat exchanger 22, the wall thickness of each first heat exchange flow channel 211 corresponding to the first heat exchange section 21a is greater than the wall thickness of each second heat exchange flow channel 212 corresponding to the second heat exchange section 21b. For example, the flow rate of the heat exchange fluid flowing through the first heat exchange section 21a may be decreased by reducing the number of the first heat exchange flow channels 211 in the first heat exchange section 21a, and the wall thickness between two adjacent first heat exchange flow channels 211 in the first heat exchange section 21a may be increased by increasing the distance between the inner side surface of the first heat exchange flow channel 211 and the outer surface of the cell 10 in the third direction C. Therefore, the wall thickness of the first heat exchange flow channel 211 corresponding to the first heat exchange section 21a is greater than the wall thickness of the second heat exchange flow channel 212 corresponding to the second heat exchange section 21b, which can improve the structural strength of the first heat exchange section 21a. When the cell 10 expands and deforms due to heat, the first heat exchanger 21 and the second heat exchanger 22 can better suppress the deformation of the cell 10 in the third direction C and strengthen the protection of the cell 10.

[0085] Furthermore, as shown in FIGS. 13 and 14, the plurality of heat exchangers 20 includes a plurality of first heat exchangers 21 and a plurality of second heat exchangers 22. The battery pack 1000 further includes a first connection pipe 23 (for example, a plurality of first connection pipes 23 as shown in FIG. 13), a second connection pipe 24 (for example, a plurality of second connection pipes 24 as shown in FIG. 13), a third connection pipe 25 (for example, a plurality of third connection pipes 25 as shown in FIG. 13), and a fourth connection pipe 26 (for example, a plurality of fourth connection pipes 26 as shown in FIG. 13). As an example, each first connection pipe 23 is connected between the first heat exchange inlets 216 of two adjacent first heat exchangers 21, and each second connection pipe 24 is connected between the first heat exchange outlets 213 of two adjacent first heat exchangers 21. Each third connection pipe 25 is connected between the second heat exchange inlets 222 of two adjacent second heat exchangers 22, and each fourth connection pipe 26 is connected between the second heat exchange outlets 223 of two adjacent second heat exchangers 22. In other words, the plurality of first heat exchangers 21 and the plurality of second heat exchangers 22 are spaced apart from each other in the third direction C. Each first heat exchanger 21 is provided with a first heat exchange inlet 216 and a first heat exchange outlet 213. Each second heat exchanger 22 is provided with a second heat exchange inlet 222 and a second heat exchange outlet 223. Two adjacent first heat exchange inlets 216 are connected to each other through the first connection pipe 23. Two adjacent first heat exchange outlets 213 are connected to each other through the second connection pipe 24. Two adjacent second heat exchange inlets 222 are connected to each other through the third connection pipe 25. Two adjacent second heat exchange outlets 223 are connected to each other through the fourth connection pipe 26. Therefore, the flow direction of the heat exchange fluid in the first heat exchanger 21 is opposite to the flow direction of the heat exchange fluid in the second heat exchanger 22 in order to dissipate heat from the two ends of the cell 10 to the cell 10.

[0086] Therefore, through the arrangement of the first connecting pipe 23 (for example, a plurality of first connecting pipes 23), the second connecting pipe 24 (for example, a plurality of second connecting pipes 24), the third connecting pipe 25 (for example, a plurality of third connecting pipes 25), and the fourth connecting pipe 26 (for example, a plurality of fourth connecting pipes 26), two adjacent first heat exchangers 21 communicate with each other, and two adjacent second heat exchangers 22 communicate with each other. As a result, the heat exchange fluid entering the heat exchanger 20 enters from different first heat exchange inlets 216 and second heat exchange inlets 222, the heat exchange efficiency of the heat exchanger 20 is improved, temperature balances at the first heat exchange inlet 216 and the first heat exchange outlet 213 and at the second heat exchange inlet 222 and the second heat exchange outlet 222 are obtained, the consistency of the temperature of the cell 10 can be improved, the temperature difference between the two ends and the center of the cell 10 in the longitudinal direction can be minimized, the cell 10 can be protected, and the service life of the cell 10 can be extended to the maximum extent.

[0087] In some embodiments, in combination with FIGS. 13 and 14, the battery pack 1000 further includes a first heat exchanger inlet pipe 214, a second heat exchanger outlet pipe 215, a second heat exchanger inlet pipe 224, and a second heat exchanger outlet pipe 225. The first heat exchanger inlet pipe 214 is connected to the first heat exchange inlet 216 of the first heat exchanger 21 installed most outwardly in the third direction C, the first heat exchanger outlet pipe 215 is connected to the first heat exchange outlet 213 of the first heat exchanger 21 installed most outwardly in the third direction C, and the first heat exchanger outlet pipe 215 and the first heat exchanger inlet pipe 214 are installed on the same side in the third direction C. The second heat exchanger inlet pipe 224 is connected to the second heat exchange inlet 222 of the second heat exchanger 22 installed most outwardly in the third direction C, the second heat exchanger outlet pipe 225 is connected to the second heat exchange outlet 223 of the second heat exchanger 22 installed most outwardly in the third direction C, and the second heat exchanger outlet pipe 225 and the second heat exchanger inlet pipe 224 are installed on the other side in the third direction C.

[0088] In the third direction C, after a plurality of cells 10, a plurality of first heat exchangers 21, and a plurality of second heat exchangers 22 are arranged, the first heat exchange inlet 216 and the first heat exchange outlet 213 of the outermost first heat exchanger 21 are respectively connected to the first heat exchanger inlet pipe 214 and the first heat exchanger outlet pipe 215, and the second heat exchange inlet 222 and the second heat exchange outlet 223 of the outermost second heat exchanger 22 are respectively connected to the second heat exchanger inlet pipe 224 and the second heat exchanger outlet pipe 225. The heat exchange fluid inside the plurality of first heat exchangers 21 enters from the first heat exchanger inlet pipe 214 and flows out from the first heat exchanger outlet pipe 215, and the heat exchange fluid inside the plurality of second heat exchangers 22 enters from the second heat exchanger inlet pipe 224 and flows out from the second heat exchanger outlet pipe 225.

[0089] Therefore, through the arrangement of the first heat exchanger inlet pipe 214, the first heat exchanger outlet pipe 215, the second heat exchanger inlet pipe 224, and the second heat exchanger outlet pipe 225, the heat exchanger 20 communicates with an external system, and the heat exchange fluid used for cooling is injected, and the heat exchange fluid can flow smoothly after flowing through the heat exchanger 20 to absorb the heat of the cells 10. In the third direction C, the first heat exchanger inlet pipe 214 and the first heat exchanger outlet pipe 215 are arranged on one side of the cells 10, and the second heat exchanger inlet pipe 224 and the second heat exchanger outlet pipe 225 are arranged on the other side of the cells 10, which promotes arranging the first heat exchanger 21 and the second heat exchanger 22, reducing the space occupied by the external system connected to the first heat exchanger inlet pipe 214 and the first heat exchanger outlet pipe 215, and improving the utilization rate of the space inside the battery pack 1000.

[0090] In some cases, each of the first connecting pipes 23, each of the second connecting pipes 24, each of the third connecting pipes 25, and each of the fourth connecting pipes 26 is a corrugated pipe. The corrugated pipe is a tubular elastic high-sensitivity element formed by connecting foldable corrugated pieces in the folding direction, the stretching direction, and the shrinking direction. Alternatively, the materials of the first connecting pipe 23 to the fourth connecting pipe 26 may be metal, and the shape of the connecting pipe may be a U shape. Therefore, the first connecting pipe 23 to the fourth connecting pipe 26 use corrugated pipes so that the elasticity of the connecting pipes can be strengthened, the first connecting pipe 23 to the fourth connecting pipe 26 have good deformation ability, and the adjustment of the connecting pipes is promoted.

[0091] In some embodiments, the first heat exchanger 21 is defined as having a thickness L1, the second heat exchanger 22 is defined as having a thickness L2, and L1 and L2 satisfy 2 mm ≤ L1 ≤ 5 mm and 2 mm ≤ L2 ≤ 5 mm. For example, L1 = 2.5 mm and L2 = 2.5 mm. Therefore, the thickness of the heat exchanger 20 is relatively thin by defining the thicknesses of the first heat exchanger 21 and the second heat exchanger 22. The occupation of the internal space of the battery pack 1000 can be effectively reduced when the heat exchanger 20 is installed between adjacent cells 10, which promotes the miniaturized design of the battery pack 1000. On the other hand, the problems that the structural strength of the first heat exchanger 21 and the second heat exchanger 22 cannot be guaranteed, and the heat dissipation ability is weak due to the thin thickness of the first heat exchanger 21 and the second heat exchanger 22 can be avoided.

[0092] In some embodiments, as shown in FIG. 16, the first heat conduction piece 51 is disposed between the first heat exchanger 21 and the cell 10, and the second heat conduction piece 52 is disposed between the second heat exchanger 22 and the cell 10. Therefore, through the arrangement of the first heat conduction piece 51 and the second heat conduction piece 52, the heat on the cell 10 is transmitted to the heat exchanger through the heat conduction piece, which can improve the heat dissipation efficiency of the cell 10.

[0093] In some embodiments, the first heat conduction sheet 51 and the second heat conduction sheet 52 are each a heat conductive structure adhesive, a heat conductive silicone, or a heat conductive silicone grease. The first heat conduction sheet 51 and the second heat conduction sheet 52 facilitate the mounting between the cell 10 and the first heat exchanger 21 and the mounting between the cell 10 and the second heat exchanger 22, while promoting the dissipation of heat from the cell 10 in contact with the first heat conduction sheet 51 and the second heat conduction sheet 52. The first heat conduction sheet 51 and the second heat conduction sheet 52 further have insulation properties and high temperature resistance. Therefore, the first heat conduction sheet 51 and the second heat conduction sheet 52 use a heat conductive structure adhesive or the like so that the heat conduction sheet has good heat conductivity, the heat dissipation ability of the cell 10 can be improved, and the structural strength and stability of the battery pack 1000 can be improved.

[0094] According to some specific embodiments of the present disclosure, in combination with FIGS. 12 to 19, a plurality of cell groups 31 are spaced apart from each other in the third direction C. One of the first heat exchanger 21 and the second heat exchanger 22 is disposed on one side of each cell group 31 in the third direction C, and the other of the first heat exchanger 21 and the second heat exchanger 22 is disposed on the other side of each cell group 31 in the third direction C. The flow directions of the heat exchange fluid inside the first heat exchanger 21 and the second heat exchanger 22 are opposite in order to simultaneously dissipate the heat of the cell 10 at the two ends in the first direction A.

[0095] As shown in FIG. 20, a vehicle 2000 according to an embodiment of the third aspect of the present disclosure includes a battery pack 1000 according to an embodiment of the second aspect.

[0096] A vehicle according to an embodiment of the present disclosure includes a battery pack 1000 according to any of the above embodiments. The heat dissipation ability and heat dissipation efficiency of the battery pack 1000 are improved, the normal operation of the battery pack 1000 is guaranteed, the possibility of safety accidents such as explosion caused by the weak heat dissipation ability of the battery pack is reduced, the durability of the vehicle is improved, the service life of the vehicle is extended, and the use cost and maintenance cost of the vehicle are reduced.

[0097] In the description of the present disclosure, terms indicating orientation or positional relationships such as "center", "longitudinal direction", "lateral direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial direction", "radial direction", and "circumferential direction" are based on the orientation or positional relationships shown in the accompanying drawings, and do not indicate or imply that the device or element being referred to must have a specific orientation or must be configured and operated in a specific orientation. It should be understood that they are used only for the purpose of explaining the present disclosure and making the explanation easier to understand. Therefore, such terms should not be construed as limitations to the present disclosure.

[0098] In the description of the present disclosure, "a first feature" or "a second feature" may include one or more of the features. In the description of the present disclosure, "a plurality of" means two or more. In the description of the present disclosure, the fact that a first feature is "above" or "below" a second feature may include the case where the first feature and the second feature are in direct contact, or may include the case where the first feature and the second feature are not in direct contact and are in contact through additional features between the first feature and the second feature. In the description of the present disclosure, the fact that a first feature is "above", "on the upper side of", or "above" a second feature may include the case where the first feature is directly above the inclined top of the second feature, or simply indicates that the height of the first feature is higher than the height of the second feature.

[0099] In the description of this specification, descriptions of directive terms such as "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in relation to the embodiments or examples are included in at least one embodiment or example of the present disclosure. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example.

[0100] Although embodiments of the present disclosure have been illustrated and described, those skilled in the art will understand that various modifications, changes, substitutions, and variations of the embodiments can be made without departing from the spirit and scope of the present disclosure. The scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. The first heat exchange section (21a), in which at least one first heat exchange flow channel (211) is provided, and the first heat exchange section (21a), Two second heat exchange sections (21b), which are respectively connected to two ends of the first heat exchange section (21a) in the first direction (A), and at least one second heat exchange flow channel (212) is provided. The volume ratio of the second heat exchange flow channel (212) in the at least one second heat exchange section (21b) is larger than the volume ratio of the first heat exchange flow channel (211) in the first heat exchange section (21a). The two second heat exchange sections (21b), A heat exchanger (20) comprising.

2. The heat exchanger (20) according to claim 1, wherein the volume ratio of the second heat exchange flow channel (212) in each second heat exchange section (21b) is larger than the volume ratio of the first heat exchange flow channel (211) in the first heat exchange section (21a).

3. A plurality of first heat exchange flow channels (211) are provided, and a plurality of second heat exchange flow channels (212) are provided, The heat exchanger (20) according to claim 1 or 2, wherein the number of the first heat exchange flow channels (211) is less than the number of the second heat exchange flow channels (212) in the at least one second heat exchange section (21b).

4. A plurality of first heat exchange flow channels (211) are provided, and a plurality of second heat exchange flow channels (212) are provided, The heat exchanger (20) according to any one of claims 1 to 3, wherein the plurality of first heat exchange flow channels (211) are arranged in a second direction (B), the plurality of second heat exchange flow channels (212) are arranged in the second direction (B), and the second direction (B) is perpendicular to the first direction (A).

5. The heat exchanger (20) according to any one of claims 1 to 4, wherein the structural strength of the first heat exchange section (21a) is higher than the structural strength of the at least one second heat exchange section (21b).

6. The heat exchanger (20) according to any one of claims 1 to 5, wherein a part of the first heat exchange section (21a) corresponding to the at least one second heat exchange flow channel (212) has a solid structure.

7. The heat exchanger (20) according to any one of claims 1 to 6, wherein the wall thickness of the at least one first heat exchange flow channel (211) is greater than the wall thickness of the at least one second heat exchange flow channel (212).

8. The heat exchanger (20) according to any one of claims 1 to 7, wherein each second heat exchange flow channel (212) and each first heat exchange flow channel (211) extend along a straight line in the first direction (A).

9. The heat exchanger (20) according to any one of claims 1 to 8, wherein the first heat exchange section (21a) is joined to the corresponding second heat exchange section (21b).

10. The heat exchanger (20) according to any one of claims 1 to 9, wherein the first heat exchange section (21a) and each second heat exchange section (21b) are each an extruded part.

11. A cell (10); A heat exchanger (20), which is the heat exchanger (20) according to any one of claims 1 to 10 and is configured to perform heat exchange with respect to the cell (10); A battery pack (1000) comprising the above.

12. A cell unit (3) comprising a plurality of cell groups (31), each cell group (31) comprising at least one of the cells (10); A plurality of the heat exchangers (20), wherein the cell groups (31) are alternately arranged with the heat exchangers (20) in a third direction (C), and the third direction (C) is perpendicular to the first direction (A); The battery pack (1000) according to claim 11, comprising the above.

13. The battery pack (1000) according to claim 12, wherein the distance between two adjacent heat exchangers (20) gradually increases from the center of the cell unit (3) toward two ends of the cell unit (3) in the third direction (C).

14. The plurality of heat exchangers (20) comprise a first heat exchanger (21) and a second heat exchanger (22). The first heat exchanger (21) is provided with a first heat exchange inlet (216) and a first heat exchange outlet (213), and the second heat exchanger (22) is provided with a second heat exchange inlet (222) and a second heat exchange outlet (223). The cell group (31) has the first direction (A) and the third direction (C) perpendicular to each other, the first heat exchanger (21) and the second heat exchanger (22) are arranged in the third direction (C), the first heat exchange inlet (216) and the second heat exchange outlet (223) are installed at one end of the heat exchanger (20) in the first direction (A), and the first heat exchange outlet (213) and the second heat exchange inlet (222) are installed at the other end of the heat exchanger (20) in the first direction (A). The first heat exchanger (21) is arranged on one side of the cell group (31) in the third direction (C), and the second heat exchanger (22) is arranged on the other side of the cell group (31) in the third direction (C). The battery pack (1000) according to claim 12.

15. The battery pack (1000) according to claim 14, wherein the flow direction of the heat exchange fluid in the first heat exchanger (21) is opposite to the flow direction of the heat exchange fluid in the second heat exchanger (22).

16. The plurality of heat exchangers (20) include a plurality of first heat exchangers (21) and a plurality of second heat exchangers (22), and the battery pack (1000) a first connecting pipe (23) connected between the first heat exchange inlets (216) of two adjacent first heat exchangers (21); a second connecting pipe (24) connected between the first heat exchange outlets (213) of the two adjacent first heat exchangers (21); a third connecting pipe (25) connected between the second heat exchange inlets (222) of two adjacent second heat exchangers (22); a fourth connecting pipe (26) connected between the second heat exchange outlets (223) of the two adjacent second heat exchangers (22) The battery pack (1000) according to claim 14 or 15, further comprising.

17. a first heat exchanger inlet pipe (214) connected to the first heat exchange inlet (216) of the first heat exchanger (21) installed on the outermost side in the third direction (C); The first heat exchanger outlet pipe (215), which is connected to the first heat exchange outlet (213) of the first heat exchanger (21) installed most outwardly in the third direction (C), and the first heat exchanger outlet pipe (215) and the first heat exchanger inlet pipe (214) are installed on one side of the battery pack (1000) in the third direction (C), the first heat exchanger outlet pipe (215), The second heat exchanger inlet pipe (224), which is connected to the second heat exchange inlet (222) of the second heat exchanger (22) installed most outwardly in the third direction (C), the second heat exchanger inlet pipe (224), The second heat exchanger outlet pipe (225), which is connected to the second heat exchange outlet (223) of the second heat exchanger (22) installed most outwardly in the third direction (C), and the second heat exchanger outlet pipe (225) and the second heat exchanger inlet pipe (224) are installed on the other side of the battery pack (1000) in the third direction (C), the second heat exchanger outlet pipe (225) The battery pack (1000) according to claim 16, further comprising.

18. The first heat exchanger (21) is defined as having a thickness L1, the second heat exchanger (22) is defined as having a thickness L2, and L1 and L2 satisfy 2 mm ≤ L1 ≤ 5 mm and 2 mm ≤ L2 ≤ 5 mm. The battery pack (1000) according to any one of claims 14 to 17.

19. The plurality of heat exchangers (20) are arranged in the third direction (C), each heat exchanger (20) is provided with an inlet (233) and an outlet (234) at two ends in the first direction (A), the inlets (233) of the plurality of heat exchangers (20) are installed at the same end in the first direction (A) and communicate with each other, and the outlets (234) of the plurality of heat exchangers (20) are installed at the other end in the first direction (A) and communicate with each other. The battery pack (1000) according to claim 12.

20. A plurality of connecting pipes (35), wherein the connecting pipe installed at the inlet (233) among the plurality of connecting pipes (35) is a fluid input pipe (33), and the connecting pipe installed at the outlet (234) among the plurality of connecting pipes (35) is a fluid output pipe (34), and the heat exchanger (20) communicates with both the fluid input pipe (33) and the fluid output pipe (34), the plurality of connecting pipes (35) The battery pack (1000) according to claim 12, further comprising the same.

21. The battery pack (1000) according to any one of claims 11 to 20, further comprising a heat conduction sheet (5) disposed between the heat exchanger (20) and the cell group (31).

22. A vehicle (2000) comprising the battery pack (1000) according to any one of claims 11 to 21.

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