Battery pack and vehicle

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack and a vehicle, the battery pack comprises a battery box body, a cylindrical battery and a heat exchange system; the battery box body comprises a bottom plate; the cylindrical battery is arranged in the battery box body and is axially parallel to the bottom plate; the heat exchange system comprises a heat exchange plate, the large surface of the heat exchange plate is relatively and vertically arranged on the bottom plate, the heat exchange plate is in contact with the end surface of the cylindrical battery, a heat exchange flow channel is formed in the heat exchange plate, and the heat exchange flow channel comprises at least one inflow flow channel and at least one outflow flow channel; wherein the ratio of the sum of the sectional areas of the inflow runners to the sum of the sectional areas of the outflow runners is 3: 2-4: 1. By means of the structural design, more heat exchange media can enter the heat exchange runners by means of the design that the sectional areas of the inflow runners are relatively large, and meanwhile the internal pressure of the runners can be increased by means of the design that the sectional areas of the outflow runners are relatively small, so that the temperature equalization effect of the heat exchange plates is guaranteed, and the temperature consistency of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] In the existing design of battery packs, some battery packs adopt the design of lying cylindrical batteries, that is, the axial direction of the cylindrical battery is parallel to the bottom plate of the battery box, and the heat exchange plate is arranged on the bottom plate in a relatively vertical form, and the end face of the cylindrical battery is in contact with the heat exchange plate for heat exchange. On this basis, for heat exchange plates using direct cooling, there is a problem of premature conversion of the refrigerant into gaseous state when flowing in the internal flow channel of the heat exchange plate during direct cooling, which affects the temperature uniformity of the heat exchange plate and leads to poor temperature consistency of the battery pack. Utility Model Content

[0003] A main purpose of the present invention is to overcome at least one defect of the above-mentioned prior art and provide a battery pack with better temperature equalization effect of the heat exchange plate.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] According to one aspect of the utility model, a battery pack is provided, which includes a battery case, a cylindrical battery and a heat exchange system; the battery case includes a bottom plate; the cylindrical battery is arranged in the battery case, and its axial direction is parallel to the bottom plate; the heat exchange system includes a heat exchange plate, the large surface of the heat exchange plate is relatively vertically arranged on the bottom plate, the heat exchange plate is in contact with the cylindrical battery for heat exchange, and the heat exchange plate has a heat exchange flow channel inside, and the heat exchange flow channel includes at least one inlet flow channel and at least one outlet flow channel; wherein the ratio of the sum of the cross-sectional areas of each inlet flow channel to the sum of the cross-sectional areas of each outlet flow channel is 3:2 to 4:1.

[0006] It can be seen from the above technical solutions that the advantages and positive effects of the battery pack proposed by the utility model are:

[0007] The battery pack proposed by the utility model adopts a layout in which cylindrical batteries are placed lying down and heat exchange plates are placed upright; the heat exchange plate has a heat exchange channel inside, and the heat exchange channel includes an inlet channel and an outlet channel; the ratio of the sum of the cross-sectional areas of each inlet channel to the sum of the cross-sectional areas of each outlet channel is 3:2 to 4:1. Through the above structural design, the utility model utilizes the design of a relatively large cross-sectional area of ​​the inlet channel to allow more heat exchange medium to enter the heat exchange channel, and at the same time utilizes the design of a relatively small cross-sectional area of ​​the outlet channel to increase the internal pressure of the channel, thereby ensuring the temperature uniformity of the heat exchange plate and improving the temperature consistency of the battery pack.

[0008] Another main purpose of the present invention is to overcome at least one of the above-mentioned defects of the prior art and provide a vehicle with better temperature consistency of the battery pack.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] According to another aspect of the utility model, a vehicle is provided, which includes the battery pack proposed in the utility model, and the heat exchange flow channel of the battery pack is suitable for allowing a refrigerant to flow, and the refrigerant is suitable for exchanging heat with the cylindrical battery through a process of converting from liquid to gas.

[0011] It can be seen from the above technical solution that the advantages and positive effects of the vehicle proposed by the utility model are:

[0012] The vehicle proposed in the utility model adopts the battery pack proposed in the utility model, and the heat exchange system adopts the direct cooling form. Through the above design, the utility model uses the design of the relatively small cross-sectional area of ​​the outflow channel to increase the internal pressure of the channel, so that the refrigerant can easily remain in liquid state under higher pressure and avoid premature conversion to gas state, ensuring that there is enough liquid refrigerant in the outflow channel to participate in evaporation and heat absorption, thereby further ensuring the uniform temperature effect of the heat exchange plate, and further suitable for the application of the direct cooling solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0014] Figure 1 is a schematic diagram of a three-dimensional structure of a battery pack according to an exemplary embodiment;

[0015] Figure 2 yes Figure 1 A schematic diagram of a three-dimensional structure of a partial structure of a battery pack is shown;

[0016] Figure 3 yes Figure 2 A cross-sectional schematic diagram of the combined structure of the base plate and the heat exchange plate is shown.

[0017] The following are the descriptions of the reference numerals:

[0018] 100. Battery box;

[0019] 110. Bottom plate;

[0020] 1101. Module base plate;

[0021] 200. Cylindrical battery;

[0022] 201. Battery pack;

[0023] 202. Battery column;

[0024] 210. First end surface;

[0025] 300. Heat exchange plate;

[0026] 310. Inflow channel;

[0027] 320. Outflow channel;

[0028] X. First direction;

[0029] Y. Second direction;

[0030] Z. Third direction. DETAILED DESCRIPTION

[0031] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present invention.

[0032] In the following description of different exemplary embodiments of the utility model, reference is made to the accompanying drawings, which form a part of the utility model and in which different exemplary structures, systems and steps that can implement multiple aspects of the utility model are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the utility model. Moreover, although the terms "above", "between", "within", etc. can be used in this specification to describe different exemplary features and elements of the utility model, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the utility model.

[0033] See also Figure 1 , which representatively shows a three-dimensional structural schematic diagram of the battery pack proposed by the utility model. In this exemplary embodiment, the battery pack proposed by the utility model is described by taking a vehicle-mounted battery as an example. It is easy for those skilled in the art to understand that in order to apply the relevant design of the utility model to other types of battery devices, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the battery pack proposed by the utility model.

[0034] like Figure 1 As shown, in one embodiment of the present invention, the battery pack provided by the present invention includes a battery box 100, a cylindrical battery 200 and a heat exchange system. Figure 2 and Figure 3 , Figure 2 , a three-dimensional schematic diagram of a partial structure of a battery pack is representatively shown, wherein a combined structure of a bottom plate 110, a heat exchange plate 300 and a part of a cylindrical battery 200 is specifically shown; Figure 3 A cross-sectional schematic diagram of the combined structure of the bottom plate 110 and the heat exchange plate 300 is representatively shown in FIG. The structure, connection method and functional relationship of each main component of the battery pack proposed by the utility model will be described in detail below in conjunction with the above drawings.

[0035] like Figures 1 to 3 As shown, in one embodiment of the present invention, the battery case 100 includes a bottom plate 110. The cylindrical battery 200 is disposed in the battery case 100, and the cylindrical battery 200 is arranged in a "lying" manner. The so-called "lying" is relative to the bottom plate 110, that is, the axial direction of the cylindrical battery 200 is parallel to the bottom plate 110. The large surface of the heat exchange plate 300 is arranged vertically relative to the bottom plate 110, that is, the heat exchange plate 300 is arranged in a "standing" manner relative to the bottom plate 110. The heat exchange plate 300 is in contact with the cylindrical battery 200 for heat exchange (it can be direct contact or indirect contact through other structures). The so-called "large surface" refers to the surface with the largest surface area of ​​the heat exchange plate 300. Among them, the heat exchange plate 300 has a heat exchange flow channel inside. The heat exchange flow channel includes an inflow flow channel 310 and an outflow flow channel 320. The flow direction of the heat exchange medium in the inflow flow channel 310 is to flow into the heat exchange plate 300, and the flow direction of the heat exchange medium in the outflow flow channel 320 is to flow out of the heat exchange plate 300. On this basis, the ratio of the sum of the cross-sectional areas of each inflow flow channel 310 to the sum of the cross-sectional areas of each outflow flow channel 320 is 3:2 to 4:1, such as 3:2, 8:5, 5:3, 11:4, 3:1, 4:1, etc. Through the above-mentioned structural design, the utility model utilizes the design of the relatively large cross-sectional area of ​​the inflow flow channel 310 to allow more heat exchange medium to enter the heat exchange flow channel, and at the same time utilizes the design of the relatively small cross-sectional area of ​​the outflow flow channel 320 to increase the internal pressure of the flow channel, thereby ensuring the temperature uniformity effect of the heat exchange plate 300 and improving the temperature consistency of the battery pack.

[0036] In one embodiment of the present invention, the ratio of the sum of the cross-sectional areas of the inflow channels 310 to the sum of the cross-sectional areas of the outflow channels 320 may be 7:4 to 8:3, such as 7:4, 9:5, 2:1, 7:3, 8:3, etc. In some embodiments, the ratio of the sum of the cross-sectional areas of the inflow channels 310 to the sum of the cross-sectional areas of the outflow channels 320 may be within the range of 3:2 to 4:1, and may be less than 7:4, or may be greater than 8:3, and is not limited to this embodiment.

[0037] like Figure 3As shown, in one embodiment of the present invention, the heat exchange flow channel includes at least two inlet flow channels 310 and at least two outlet flow channels 320. On this basis, in the first direction X perpendicular to the bottom plate 110, at least two of the inlet flow channels 310 are at different distances from the bottom plate 110, and at least two of the outlet flow channels 320 are at different distances from the bottom plate 110, wherein the inlet flow channel 310 farthest from the bottom plate 110 is farther away from the bottom plate 110 than the outlet flow channel 320 farthest from the bottom plate 110. Through the above structural design, the present invention can realize that the heat exchange medium inlet of the heat exchange plate 300 is located above the heat exchange medium outlet, thereby utilizing the gravity to increase the flow rate of the heat exchange medium and accelerate the heat exchange efficiency.

[0038] like Figure 3 As shown, based on the structural design that the inflow channel 310 farthest from the bottom plate 110 is farther away from the bottom plate 110 than the outflow channel 320 farthest from the bottom plate 110, in one embodiment of the present invention, in the first direction X, the inflow channel 310 closest to the bottom plate 110 is farther away from the bottom plate 110 than the outflow channel 320 farthest from the bottom plate 110. Through the above structural design, the present invention can make all the inflow channels 310 farther away from the bottom plate 110 than the outflow channels 320, thereby further utilizing the gravity to increase the flow rate of the heat exchange medium and further accelerate the heat exchange efficiency.

[0039] like Figure 3 As shown, the heat exchange plate 300 can adopt a harmonica tube structure, that is, each inflow channel 310 and the outflow channel 320 are arranged in a row along a single direction (for example, the first direction). On this basis, any inflow channel 310 can be located on the side of any outflow channel 320 facing away from the bottom plate 110. In some embodiments, the heat exchange plate 300 can also adopt other forms of channel arrangement structures, in which case the inflow channel 310 and the outflow channel 320 can also be partially misaligned in the first direction, for example, at least one inflow channel 310 can be located on the side of at least one outflow channel 320 facing the bottom plate 110, and the above embodiment is not limited thereto.

[0040] It should be noted that, in one embodiment of the present utility model, the heat exchange channel of the heat exchange plate 300 may include only one inlet channel 310 and one outlet channel 320, and the ratio of the cross-sectional area of ​​the inlet channel 310 to the cross-sectional area of ​​the outlet channel 320 is 3:2 to 3:1. In some embodiments, when the heat exchange channel includes one inlet channel 310, it may include at least two outlet channels 320 at the same time, or, when the heat exchange channel includes one outlet channel 320, it may include at least two inlet channels 310 at the same time, and the above embodiments are not limited thereto.

[0041] like Figure 2As shown, in one embodiment of the present invention, the cylindrical battery 200 has a side surface and two end surfaces, the side surface is connected between the two end surfaces, the two end surfaces are spaced apart along the axial direction of the cylindrical battery 200 (for example, a second direction Y parallel to the axial direction of the cylindrical battery 200) and are respectively perpendicular to the axial direction, and the heat exchange plate 300 can be in contact with the end surface of the cylindrical battery 200 for thermal conductivity connection, such as direct contact connection or indirect connection through other thermal conductive structures such as thermal conductive glue. Through the above structural design, the present invention can facilitate the arrangement of the cylindrical battery 200, which is conducive to improving the energy density of the battery pack.

[0042] like Figure 2 As shown, based on the structural design that the heat exchange plate 300 contacts the end face of the cylindrical battery 200, in one embodiment of the utility model, the cylindrical battery 200 includes a shell and a battery cell, the battery cell is arranged in the shell, and the battery cell includes a positive pole ear and a negative pole ear. Among them, in the second direction Y, the battery cell has an opposite first end and a second end, the positive pole ear and the negative pole ear are both located at the first end, and the two end faces of the cylindrical battery 200 are respectively a first end face 210 and a second end face, the first end face 210 corresponds to the first end, and the second end face corresponds to the second end. On this basis, the heat exchange plate 300 can be thermally connected to the second end face of the cylindrical battery 200. Through the above structural design, since there are other structures such as electrode lead-out terminals on one side of the first end face 210 of the cylindrical battery 200, the utility model can avoid interference between the heat exchange plate 300 and structures such as the electrode lead-out terminals of the cylindrical battery 200.

[0043] like Figure 2 As shown, in one embodiment of the present invention, the battery pack provided by the present invention may include at least one battery group 201, the battery group 201 includes at least two layers of battery columns 202 arranged along a first direction X, the first direction X is perpendicular to the bottom plate 110, the battery column 202 includes at least two cylindrical batteries 200 arranged along a third direction Z, the third direction Z is parallel to the bottom plate 110 and parallel to the heat exchange plate 300. Through the above structural design, the present invention can make full use of the internal space of the battery box 100 to arrange the cylindrical batteries 200, which is conducive to improving the energy density of the battery pack.

[0044] like Figure 2 and Figure 3As shown, based on the structural design that the battery pack 201 includes at least two layers of battery columns 202 arranged along the first direction X, in one embodiment of the present invention, the inflow channel 310 and the outflow channel 320 can be arranged along the first direction X. Through the above structural design, since at least two layers of battery columns 202 are arranged along the first direction X, the present invention utilizes the special design of the cross-sectional area of ​​the inflow channel 310 and the outflow channel 320 to specifically improve the temperature uniformity effect of the heat exchange plate 300 in the first direction X, which is beneficial to reduce the temperature difference of different layers of battery columns 202, and further improve the temperature consistency of the battery pack.

[0045] like Figure 1 and Figure 2 As shown, based on the structural design that the battery pack 201 includes at least two layers of battery columns 202 arranged along the first direction X, in one embodiment of the present invention, the battery pack provided by the present invention may include at least two battery packs 201, and at least two battery packs 201 are arranged along the second direction Y. On this basis, the end faces (such as the second end faces) of the cylindrical batteries 200 of two adjacent battery packs 201 can be in contact with the opposite sides of the heat exchange plate 300 respectively. Through the above structural design, the present invention can use the heat exchange plate 300 to achieve contact heat exchange with the cylindrical batteries 200 of two adjacent battery packs 201, which is conducive to reducing the number of components and simplifying the complexity of the structure.

[0046] In one embodiment of the present invention, the heat exchange system can adopt a direct cooling form, and the heat exchange medium can be a refrigerant, that is, the heat exchange channel is suitable for the circulation of refrigerant, and the refrigerant is suitable for exchanging heat with the cylindrical battery 200 through the process of converting from liquid to gas. Specifically, the refrigerant enters the heat exchange channel in a liquid state, and exchanges heat with the cylindrical battery 200 in the heat exchange channel through the heat transfer of the heat exchange plate 300, that is, the evaporation heat absorption of the refrigerant is used to cool the cylindrical battery 200. Through the above design, the utility model uses the design of a relatively small cross-sectional area of ​​the outflow channel 320 to increase the internal pressure of the channel, so that the refrigerant is easy to maintain a liquid state under a higher pressure and avoid premature conversion to a gas state, ensuring that there is enough liquid refrigerant in the outflow channel 320 to participate in evaporation heat absorption, thereby further ensuring the temperature uniformity effect of the heat exchange plate 300, and further suitable for the application of the direct cooling solution.

[0047] In one embodiment of the present invention, the cylindrical battery 200 may be a lithium iron battery. For example, the positive electrode active material of the cylindrical battery 200 may be lithium iron phosphate.

[0048] It should be noted that Figure 1Taking the illustrated embodiment as an example, when cylindrical batteries 200 are provided on both sides of the heat exchange plate 300 in the second direction Y, the heat exchange plate 300 and the cylindrical batteries 200 on both sides and other related structures can together constitute a battery module, and the battery module can be arranged on the module bottom plate 1101, and arranged on the bottom plate 110 of the battery box through the module bottom plate 1101. At this time, the relative arrangement relationship between each structure and the bottom plate 110 in this specification can be correspondingly understood as the relative arrangement relationship between each structure and the module bottom plate 1101. Through the above-mentioned structural design, the utility model can improve the integration of the battery module, which is conducive to improving the assembly efficiency. It should be understood that in some embodiments, the battery pack may not be provided with a module bottom plate 1101, and the battery module may also be directly arranged on the bottom plate 110 of the battery box 100.

[0049] It should be noted that the battery packs shown in the drawings and described in this specification are only a few examples of many types of battery packs that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details of the battery packs shown in the drawings or described in this specification or any components of the battery packs.

[0050] In summary, the battery pack proposed by the utility model adopts a layout in which the cylindrical battery 200 is placed lying and the heat exchange plate 300 is placed upright; the heat exchange plate 300 has a heat exchange channel inside, and the heat exchange channel includes an inlet channel 310 and an outlet channel 320; the ratio of the sum of the cross-sectional areas of each inlet channel 310 to the sum of the cross-sectional areas of each outlet channel 320 is 3:2 to 4:1. Through the above-mentioned structural design, the utility model utilizes the design of the relatively large cross-sectional area of ​​the inlet channel 310 to allow more heat exchange medium to enter the heat exchange channel, and at the same time utilizes the design of the relatively small cross-sectional area of ​​the outlet channel 320 to increase the internal pressure of the channel, thereby ensuring the temperature uniformity effect of the heat exchange plate 300 and improving the temperature consistency of the battery pack.

[0051] Based on the above detailed description of several exemplary embodiments of the battery pack proposed in the present invention, an exemplary embodiment of the vehicle proposed in the present invention will be described below.

[0052] In one embodiment of the present invention, the vehicle proposed by the present invention includes the battery pack proposed by the present invention and described in detail in the above embodiment, and the heat exchange flow channel of the battery pack is suitable for the circulation of refrigerant, and the refrigerant is suitable for exchanging heat with the cylindrical battery through a process of converting liquid to gas.

[0053] It should be noted that the vehicles shown in the drawings and described in this specification are only a few examples of many types of vehicles that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details of the vehicles shown in the drawings or described in this specification or any components of the battery pack.

[0054] In summary, the vehicle proposed by the utility model adopts the battery pack proposed by the utility model, and the heat exchange system adopts the direct cooling form. Through the above design, the utility model uses the design of the relatively small cross-sectional area of ​​the outflow channel to increase the internal pressure of the channel, so that the refrigerant can easily remain in liquid state under higher pressure and avoid premature conversion to gas state, ensuring that there is enough liquid refrigerant in the outflow channel to participate in evaporation and heat absorption, thereby further ensuring the uniform temperature effect of the heat exchange plate, and further suitable for the application of the direct cooling solution.

[0055] The exemplary embodiments of the battery pack proposed by the utility model are described and / or illustrated in detail above. However, the embodiments of the utility model are not limited to the specific embodiments described here. On the contrary, the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described here. Each component and / or each step of an embodiment can also be used in combination with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated here, the terms "one", "one" and "above" are used to indicate the presence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to express the meaning of open inclusion and mean that in addition to the listed elements / components / etc., there may be additional elements / components / etc. In addition, the terms "first" and "second" in the claims and the specification are used only as marks and are not numerical restrictions on their objects.

[0056] Although the battery pack of the present invention has been described according to different specific embodiments, those skilled in the art will recognize that the implementation of the present invention can be modified within the spirit and scope of the claims.

Claims

1. A battery pack, characterized in that: include: A battery box, including a bottom plate; A cylindrical battery is disposed in the battery box, with its axis parallel to the bottom plate; as well as A heat exchange system, comprising a heat exchange plate, wherein a large surface of the heat exchange plate is relatively vertically arranged on the bottom plate, the heat exchange plate contacts and exchanges heat with the cylindrical battery, and the heat exchange plate has a heat exchange flow channel inside, wherein the heat exchange flow channel comprises at least one inflow flow channel and at least one outflow flow channel; Wherein, the ratio of the sum of the cross-sectional areas of the inflow channels to the sum of the cross-sectional areas of the outflow channels is 3:2 to 4:

1.

2. The battery pack according to claim 1, characterized in that: The ratio of the sum of the cross-sectional areas of the inflow channels to the sum of the cross-sectional areas of the outflow channels is 7:4 to 8:

3.

3. The battery pack according to claim 1, characterized in that: The heat exchange flow channel includes at least two inlet flow channels and at least two outlet flow channels; wherein, in a first direction perpendicular to the bottom plate, at least two of the inlet flow channels are at different distances from the bottom plate, and at least two of the outlet flow channels are at different distances from the bottom plate, and the inlet flow channel farthest from the bottom plate is farther away from the bottom plate than the outflow channel farthest from the bottom plate.

4. The battery pack according to claim 3, characterized in that: In the first direction, the inflow channel closest to the bottom plate is farther away from the bottom plate than the outflow channel farthest from the bottom plate.

5. The battery pack according to claim 1, characterized in that: The cylindrical battery has a side surface and two end surfaces, the side surface is connected between the two end surfaces, the two end surfaces are spaced apart along the axial direction of the cylindrical battery and are respectively perpendicular to the axial direction, and the heat exchange plate is in contact with the end surfaces of the cylindrical battery for thermal conductivity.

6. The battery pack according to claim 5, characterized in that: The cylindrical battery includes a shell and a battery cell, wherein the battery cell is arranged in the shell, and the battery cell includes a positive electrode tab and a negative electrode tab. In a second direction parallel to the axial direction, the battery cell has a first end and a second end opposite to each other, the positive electrode tab and the negative electrode tab are both located at the first end, and the two end faces are respectively a first end face and a second end face, wherein the first end face corresponds to the first end, and the second end face corresponds to the second end; wherein the heat exchange plate is in thermal contact with the second end face.

7. The battery pack according to claim 1, characterized in that: The battery pack includes at least one battery group, the battery group includes at least two layers of battery columns arranged along a first direction, the first direction is perpendicular to the bottom plate, the battery column includes at least two cylindrical batteries arranged along a third direction, the third direction is parallel to the bottom plate and parallel to the heat exchange plate.

8. The battery pack according to claim 7, characterized in that: The inflow channel and the outflow channel are arranged along the first direction.

9. The battery pack according to claim 7, characterized in that: The battery pack includes at least two battery groups, and at least two battery groups are arranged along a second direction parallel to the axial direction; wherein end surfaces of the cylindrical batteries of two adjacent battery groups are in contact with opposite sides of the heat exchange plate, respectively.

10. The battery pack according to claim 1, characterized in that: The heat exchange flow channel is suitable for circulating a refrigerant, and the refrigerant is suitable for exchanging heat with the cylindrical battery through a process of converting a liquid state into a gas state.

11. The battery pack according to claim 1, characterized in that: The cylindrical battery is a lithium iron battery.

12. A vehicle, characterized in that: A battery pack comprising any one of claims 1 to 11, wherein the heat exchange channel of the battery pack is suitable for circulation of a refrigerant, and the refrigerant is suitable for exchanging heat with the cylindrical battery via a process of converting from liquid to gas.

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