Battery module and battery pack

Abstract

The utility model discloses a battery module and a battery pack, the battery pack comprises a battery module and a fan, the battery module comprises a support assembly, a plurality of cylindrical batteries and a first heat dissipation block, and the plurality of cylindrical batteries are arranged on the support assembly along a first direction; the first heat dissipation block comprises a base part and a plurality of heat dissipation fins, the base part surrounds the radial side face of the cylindrical battery, and the heat dissipation fins are arranged on the side, away from the cylindrical battery, of the base part at intervals. Compared with the prior art, the first heat dissipation block is arranged on the side surface of the cylindrical battery, the first heat dissipation block comprises the base part and the plurality of heat dissipation fins, and the base part surrounds the side surface of the cylindrical battery, so that the contact area between the first heat dissipation block and the cylindrical battery is increased, and the heat transfer effect between the cylindrical battery and the first heat dissipation block is improved; the plurality of cooling fins increase the contact area between the first heat dissipation block and other cooling media such as external air, the cooling effect of the first heat dissipation block is accelerated, and the rapid heat dissipation function of the battery module is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery module and battery package. BACKGROUND

[0002] The performance of the battery is closely related to temperature, and high temperature can cause the chemical reaction in the battery to intensify, accelerate the aging of the battery, and reduce the capacity and life of the battery. Usually, a plurality of batteries are arranged in the battery module, and the surface of the battery is cooled by air. The air has a low heat conduction coefficient and poor heat dissipation efficiency, which cannot effectively reduce the temperature of the battery and the battery module, and the temperature difference between the battery modules is large. SUMMARY

[0003] One purpose of the utility model is to provide a battery module and battery package, which aims to solve the technical problem of cell heat dissipation.

[0004] To achieve the above purpose, the utility model provides a scheme: a battery module, the battery module includes support assembly, a plurality of cylindrical batteries and first radiating block, a plurality of cylindrical batteries are arranged along the first direction and are arranged on the support assembly;The first radiating block includes a base and a plurality of radiating fins, the base surrounds the side of the radial direction of the cylindrical battery, and the radiating fin is arranged on the side of the base away from the cylindrical battery.

[0005] Optionally, the radiating fin includes a plurality of first fins and a plurality of second fins, a plurality of first fins are arranged at opposite ends of the base, a plurality of first fins and the base form a groove, a plurality of second fins are arranged in the groove, and the thickness of the first fin is greater than the thickness of the second fin.

[0006] Optionally, the plurality of radiating fins are arranged parallel to each other, and a radiating channel is formed between adjacent radiating fins.

[0007] Optionally, the extension direction of the radiating channel is the same as the first direction.

[0008] Optionally, the battery module further includes a first silica gel pad, and the first silica gel pad is arranged between the base and the cylindrical battery.

[0009] Optionally, the base is provided with a plurality of spaced limiting grooves, the cylindrical battery is assembled in the limiting groove, and the base is inserted between adjacent cylindrical batteries to surround part of the side wall of the cylindrical battery.

[0010] Optionally, the ratio of the depth of the base into the cylindrical battery to the diameter of the cylindrical battery is α, and 0.5≤α≤1.

[0011] Optionally, the plurality of cylindrical batteries are arranged into at least three columns in a second direction, the first direction and the second direction being perpendicular to each other, and a wind channel parallel to the first direction is formed between each adjacent column of the cylindrical batteries; the battery module further comprises a second heat sink, the base is in contact with the cylindrical batteries located in the first column and the last column, and the second heat sink surrounds the side surface of the cylindrical batteries located in the remaining columns in the radial direction.

[0012] Optionally, the battery module further comprises a second silica gel pad, and the second silica gel pad is arranged between the second heat sink and the cylindrical batteries.

[0013] Optionally, the second heat sink is provided in plurality, and the plurality of second heat sinks are arranged between the cylindrical batteries along the first direction, and the opposite side surfaces of the second heat sinks are arranged in the wind channel.

[0014] Optionally, the ratio of the depth of the second heat sink to the diameter of the cylindrical battery is β, and 0.5≤β≤1.

[0015] Optionally, the support assembly comprises a first support and a second support, the first support is provided with a first connecting column towards the second support, the second support is provided with a second connecting column towards the first support, the first connecting column and the second connecting column are connected together, and the first connecting column and / or the second connecting column clamps the base.

[0016] To achieve the above-mentioned purpose, a scheme provided by the utility model is: a battery pack, the battery pack comprises: a fan and a plurality of battery modules according to any one of the above, and the fan is used for blowing wind towards the plurality of cylindrical batteries along the first direction.

[0017] The utility model discloses a beneficial effect lies in: the application provides a kind of battery module and battery pack, battery pack includes battery module and fan, battery module includes support assembly, multiple cylindrical batteries and first radiating fin, multiple cylindrical batteries are arranged in support assembly along first direction;First radiating fin includes base and multiple radiating fins, base surrounds the side of the radial direction of cylindrical battery, and radiating fin is arranged on the side of base away from cylindrical battery. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the description of embodiments or prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creative labor.

[0019] Figure 1 is the assembly structure schematic diagram of the battery module provided by the utility model embodiment;

[0020] Figure 2 is the structure schematic diagram of first radiating fin provided by the utility model embodiment;

[0021] Figure 3 is the cross-sectional schematic diagram of battery module provided by the utility model embodiment;

[0022] Figure 4 is Figure 3 enlarged view of A in the figure;

[0023] Figure 5 is the parts exploded schematic diagram of battery module provided by the utility model embodiment.

[0024] Explanation of reference numerals: 10, support assembly; 20, cylindrical battery; 30, first heat dissipation block; 40, first silica gel pad; 50, second heat dissipation block; 60, second silica gel pad; 101, first support; 102, second support; 103, first connecting column; 104, second connecting column; 301, base; 302, heat dissipation fin; 303, groove; 304, heat dissipation channel; 3011, limiting groove; 3021, first piece; 3022, second piece. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] Referring to Figure 1 , the present application provides a battery pack, which comprises a battery module and a fan (not shown in the figure), and the fan is used for blowing air towards a plurality of cylindrical batteries 20 in a first direction. In order to clearly describe the embodiments, Figure 1 In the embodiment, the X direction represents the first direction. In actual application, the fan blows air towards the plurality of cylindrical batteries 20 in the first direction, and the first direction is usually the direction in which the plurality of cylindrical batteries 20 are arranged in sequence. The fan blows air in the first direction, which can accelerate heat dissipation between the cylindrical batteries 20 and avoid a large temperature difference between the battery cells in the module.

[0027] Referring to Figure 2 , the above-mentioned battery module comprises a support assembly 110, a plurality of cylindrical batteries 20 and a first heat dissipation block 30. The plurality of cylindrical batteries 20 are arranged in the first direction on the support assembly 110. The first heat dissipation block 30 comprises a base 301 and a plurality of heat dissipation fins 302. The base 301 surrounds the side surface of the cylindrical battery 20 in the radial direction, and the heat dissipation fins 302 are arranged at intervals on the side of the base 301 away from the cylindrical battery 20.

[0028] In practical applications, the support assembly 110 itself defines a first direction, which can be the length direction of the support assembly 110, so that the support assembly 110 can be installed with a larger number of cylindrical batteries 20, thereby improving the utilization rate of the device. The first heat dissipation block 30 is used for dissipating heat and cooling the cylindrical battery 20. Specifically, the first heat dissipation block 30 includes a base 301 and a plurality of heat dissipation fins 302. The base 301 surrounds the side surface of the cylindrical battery 20. The side surface of the cylindrical battery 20 has a larger area. The base 301 is in contact with the side surface, which can increase the heat dissipation area. The plurality of heat dissipation fins 302 are arranged at intervals on the side of the base 301 away from the cylindrical battery 20. The heat dissipation fins 302 should be located outside the support assembly 110. The base 301 transfers the heat generated by the cylindrical battery 20 to the heat dissipation fins 302. The plurality of heat dissipation fins 302 increase the contact area of the base 301 with air or other cooling medium. Through heat transfer and heat exchange, the heat dissipation fins 302 dissipate heat to the outside of the support assembly 110.

[0029] Compared with the prior art, the first heat dissipation block 30 is arranged on the side surface of the cylindrical battery 20. The first heat dissipation block 30 includes a base 301 and a plurality of heat dissipation fins 302. The base 301 surrounds the side surface of the cylindrical battery 20, thereby increasing the contact area of the first heat dissipation block 30 with the cylindrical battery 20. Thus, the heat transfer effect of the cylindrical battery 20 and the first heat dissipation block 30 is improved. The plurality of heat dissipation fins 302 increase the contact area of the first heat dissipation block 30 with the external air and other cooling medium, thereby accelerating the cooling effect of the first heat dissipation block 30 and achieving the function of rapidly dissipating heat of the battery module.

[0030] It can be understood that the heat dissipation fins 302 and the base 301 are made of materials with good heat conduction function. In this embodiment, the heat dissipation device of the present application uses a fan, and the heat dissipation medium is air. At this time, the heat dissipation fins 302 can be made of metal structures such as fins. In other embodiments, the heat dissipation device can also use a liquid cooling system or other equipment, and the heat dissipation medium can be cooling liquid. At this time, the heat dissipation fins 302 can be heat pipe heat dissipation fins 302, which realize the heat dissipation effect through the circulation of the cooling liquid.

[0031] It should be noted that the axial direction of the cylindrical battery 20 is perpendicular to the first direction, the radial direction of the cylindrical battery 20 is parallel to the first direction, and the side surface of the cylindrical battery 20 refers to the outer surface in the circumferential direction thereof.

[0032] Again referring to Figure 1 , the support assembly 110 includes a first support 101 and a second support 102. The first support 101 is provided with a first connecting column 103 facing the second support 102. The second support 102 is provided with a second connecting column 104 facing the first support 101. The first connecting column 103 and the second connecting column 104 are connected together. The first connecting column 103 and / or the second connecting column 104 clamps the base 301.

[0033] In order to clearly describe the embodiments, Figure 1 The Y direction represents the width direction of the support assembly 110; in actual applications, the first support 101 and the second support 102 are respectively located at opposite sides of the support assembly 110 along the width direction, the first support 101 and the second support 102 are connected together through the first connecting column 103 and the second connecting column 104, and the base 301 is clamped between the first support 101 and the second support 102 to facilitate fixing the base 301. In this way, when disassembling, the first support 101 and the second support 102 can be separated only by separating the first connecting column 103 and the second connecting column 104, and the disassembly of the support assembly 110 is completed. Specifically, the first connecting column 103 and the second connecting column 104 can be connected in a detachable manner, such as threaded connection, clamping or plug-in connection, etc., to improve the efficiency of assembly and disassembly.

[0034] The base 301 can be connected with the first connecting column 103, or connected with the second connecting column 104, or connected with both the first connecting column 103 and the second connecting column 104, which is not limited in the present application.

[0035] Referring to Figure 2 In an embodiment, the heat sink 302 can include a plurality of first fins 3021 and a plurality of second fins 3022, the plurality of first fins 3021 are arranged at opposite ends of the base 301, the plurality of first fins 3021 and the base 301 form a groove 303, and the plurality of second fins 3022 are arranged in the groove 303, the thickness of the first fin 3021 is greater than the thickness of the second fin 3022.

[0036] In actual applications, the base 301 is usually provided with the first fin 3021 at opposite sides along the width direction thereof, the base 301 and the first fins 3021 at the opposite sides form the groove 303, and the plurality of second fins 3022 are sequentially arranged in the groove 303 along the width direction of the base 301. The first fin 3021 is mainly used to provide a mounting position for the second fin 3022. Since the plurality of second fins 3022 are located between the two first fins 3021, the first fin 3021 is more likely to contact external objects than the second fin 3022. In order to avoid damage to the first fin 3021, the thickness of the first fin 3021 is set to a relatively large size to enhance the structural strength of the first fin 3021. The second fin 3022 is mainly used for heat dissipation, and the number, thickness and spacing of the second fin 3022 will affect the heat dissipation performance of the heat sink 302. Generally speaking, the more the second fins 3022, the thinner the second fins 3022, and the smaller the spacing, the better the heat dissipation effect. Therefore, the thickness of the second fin 3022 is set to a relatively small thickness, and the spacing between adjacent two second fins 3022 is also smaller than the spacing between adjacent two first fins 3021, thereby increasing the heat dissipation function of the heat sink 302.

[0037] Again referring toFigure 2 In an embodiment, the plurality of fins 302 are arranged in parallel to each other, and the heat dissipation channels 304 are formed between adjacent fins 302. When the plurality of fins 302 are arranged in parallel, the heat dissipation channels 304 between adjacent fins 302 can form a relatively stable and regular air duct, which is conducive to the smooth flow of air and reduces the generation of air turbulence and vortex, thereby improving the heat exchange efficiency between air and the fins 302.

[0038] Again referring to Figure 1 and Figure 2 , the extension direction of the heat dissipation channels 304 is the same as the first direction.

[0039] Since the first direction is the arrangement direction of the plurality of cylindrical batteries 20, the heat dissipation channels 304 are the same as the first direction, so that the heat dissipation channels 304 can uniformly contact each cylindrical battery 20 with the same contact area, which is conducive to uniform heat dissipation of the plurality of cylindrical batteries 20, so that the temperatures of the cylindrical batteries 20 are relatively close, avoiding that the heat dissipation efficiencies of the cylindrical batteries 20 are different, resulting in that some cylindrical batteries 20 can be well cooled, while some other cylindrical batteries 20 are not well cooled, thereby causing local overheating.

[0040] Referring to Figure 3 and Figure 4 , the battery module further includes a first silica gel pad 40, which is arranged between the base 301 and the cylindrical batteries 20.

[0041] In actual application, in order to improve the heat transfer efficiency between the cylindrical batteries 20 and the base 301, the first silica gel pad 40 is arranged between the base 301 and the cylindrical batteries 20. Since the cylindrical batteries 20 and the base 301 are both rigid structures, the surfaces of the cylindrical batteries 20 and the base 301 cannot be absolutely flat, and there will be a small gap when the two are directly contacted, which will increase the resistance of heat conduction. The first silica gel pad 40 has good flexibility and elasticity, and can fully fill the gap between the cylindrical batteries 20 and the base 301, so that the two form a close contact, thereby greatly reducing the thermal resistance and improving the heat conduction efficiency, ensuring that the heat generated by the cylindrical batteries 20 can be more effectively transferred to the base 301, and then transferred to the fins 302 for dissipation.

[0042] It can be understood that the first silica gel pad 40 is made of a flexible and heat-conducting material. In addition, in some other embodiments, the first silica gel pad 40 can also be replaced by other heat dissipation materials such as heat dissipation silicone grease.

[0043] Referring to Figure 5The base 301 is provided with a plurality of spaced limiting grooves 3011, the cylindrical battery 20 is assembled in the limiting groove 3011, and the base 301 is inserted between the adjacent cylindrical batteries 20 to surround part of the side wall of the cylindrical battery 20.

[0044] In actual application, the limiting groove 3011 is in an arc structure, the arc structure is more suitable for the side surface of the cylindrical battery 20, in the installation, the cylindrical battery 20 is more fitted to the limiting groove 3011, and the base 301 between the two adjacent limiting grooves 3011 is inserted between the two cylindrical batteries 20, on the one hand, the contact area of the base 301 and the cylindrical battery 20 is increased, which helps to improve the heat transfer efficiency, on the other hand, the arrangement of the cylindrical battery 20 is more compact, and the space utilization rate is higher. The first silica gel pad 40 can be attached to the limiting groove 3011, and the gap between the cylindrical battery 20 and the groove wall of the limiting groove 3011 is filled.

[0045] In an embodiment, the ratio of the depth of the base 301 into the cylindrical battery 20 and the diameter of the cylindrical battery 20 is α, and 0.5≤α≤1. That is, the limiting groove 3011 surrounds at least half of the side surface area of the cylindrical battery 20, which greatly improves the heat dissipation area of the base 301 and the cylindrical battery 20, and is conducive to rapid heat dissipation of the cylindrical battery 20. At the same time, the limiting groove 3011 surrounds most of the cylindrical battery 20, which can improve the stability of the cylindrical battery 20 assembly and avoid shaking of the cylindrical battery 20 due to external impact.

[0046] Again refer to Figure 3 The plurality of cylindrical batteries 20 are arranged in at least three columns along a second direction, the first direction and the second direction are perpendicular to each other, and a wind channel parallel to the first direction is formed between each adjacent column of cylindrical batteries 20.

[0047] For the sake of clear description, Figure 3 The Z direction represents the second direction, and can also be the height direction of the support assembly 110. In actual application, the plurality of cylindrical batteries 20 are arranged in a plurality of rows and a plurality of columns, and the plurality of cylindrical batteries 20 can be closely arranged when stacked, thereby realizing efficient use of space and improving the energy density of the battery pack. A wind channel parallel to the first direction is formed between each adjacent column of cylindrical batteries 20, which helps to realize the heat dissipation effect of the cylindrical batteries 20 in the battery module. When the fan blows in the first direction, the wind channel between each adjacent column of cylindrical batteries 20 flows faster, thereby improving the heat dissipation efficiency.

[0048] And the battery module further comprises a second heat dissipation block 50, the base 301 is in contact with the cylindrical batteries 20 located in the first column and the last column, and the second heat dissipation block 50 surrounds the side surface of the cylindrical batteries 20 located in the remaining columns in the radial direction.

[0049] In practical application, the support assembly 110 has a top and a bottom along its height direction (i.e. the second direction), and the base 301 is mainly arranged at the top and the bottom of the support assembly 110. Therefore, the cylindrical batteries 20 located at the top and the bottom of the support assembly 110 are in contact with the base 301 and dissipate heat through the heat dissipation function of the base 301, while the cylindrical batteries 20 located at the middle of the support assembly 110 dissipate heat through the second heat dissipation blocks 50, which surround the cylindrical batteries 20 located at the middle. The second heat dissipation blocks 50 dissipate heat generated by the cylindrical batteries 20 through heat exchange with the cylindrical batteries 20 to achieve the heat dissipation function.

[0050] It should be noted that the middle of the support assembly 110 described above refers to the part located between the top and the bottom along the second direction.

[0051] Referring again to Figure 3 and Figure 4 , the second heat dissipation blocks 50 are multiple, and the multiple second heat dissipation blocks 50 are arranged between the cylindrical batteries 20 along the first direction. The opposite sides of the second heat dissipation blocks 50 are arranged in the air duct.

[0052] In practical application, along the first direction, the opposite sides of the second heat dissipation blocks 50 are provided with arc-shaped grooves, which are used to surround the side surfaces of the cylindrical batteries 20. Therefore, the second heat dissipation blocks 50 are clamped between two cylindrical batteries 20. Along the second direction, the cylindrical batteries 20 in adjacent two rows form an air duct, and the opposite sides of the second heat dissipation blocks 50 are located in the air duct. In this way, when the fan blows air in the first direction, the cold air exchanges heat with the two sides of the second heat dissipation blocks 50 through the air duct, thereby improving the heat dissipation efficiency of the second heat dissipation blocks 50.

[0053] In an embodiment, the ratio of the depth of the second heat dissipation blocks 50 surrounding the cylindrical batteries 20 to the diameter of the cylindrical batteries 20 is β, and 0.5≤β≤1. That is, the arc-shaped grooves on the opposite sides of the second heat dissipation blocks 50 at least surround half of the side surface area of the cylindrical batteries 20, thereby increasing the contact area between the second heat dissipation blocks 50 and the cylindrical batteries 20, facilitating heat exchange between the cylindrical batteries 20 and the second heat dissipation blocks 50, and improving the heat dissipation efficiency. Moreover, the arc-shaped grooves surround most of the cylindrical batteries 20, which can improve the connection stability between the cylindrical batteries 20 and the second heat dissipation blocks 50 and avoid shaking of the cylindrical batteries 20 due to external impact.

[0054] Referring again to Figure 4 , the battery module further comprises a second silica gel pad 60, which is arranged between the second heat dissipation blocks 50 and the cylindrical batteries 20. Specifically, the second silica gel pad 60 is attached to the arc-shaped grooves to fully fill the gap between the cylindrical batteries 20 and the second heat dissipation blocks 50, so that the two are in close contact, reducing thermal resistance and improving heat conduction efficiency.

[0055] It can be understood that the second silica gel pad 60 is made of a material that is flexible and has good heat conduction performance. In addition, in some other embodiments, the second silica gel pad 60 can also be replaced by other heat dissipation materials such as heat dissipation silicone grease.

[0056] Different from the prior art, the battery module and the battery pack provided by the embodiments of the present application are provided. The battery pack comprises a battery module and a fan. The battery module comprises a support assembly 110, a plurality of cylindrical batteries 20 and a first heat dissipation block 30. The plurality of cylindrical batteries 20 are arranged along a first direction on the support assembly 110. The first heat dissipation block 30 comprises a base 301 and a plurality of heat dissipation fins 302. The base 301 surrounds the side of the cylindrical battery 20 in the radial direction. The heat dissipation fins 302 are arranged at intervals on the side of the base 301 away from the cylindrical battery 20. Compared with the prior art, the first heat dissipation block 30 is arranged on the side of the cylindrical battery 20. The first heat dissipation block 30 comprises the base 301 and the plurality of heat dissipation fins 302. The base 301 surrounds the side of the cylindrical battery 20, thereby increasing the contact area of the first heat dissipation block 30 and the cylindrical battery 20, and improving the heat transfer effect of the cylindrical battery 20 and the first heat dissipation block 30. The plurality of heat dissipation fins 302 increase the contact area of the first heat dissipation block 30 and the external air and other cooling media, thereby accelerating the cooling effect of the first heat dissipation block 30 and realizing the rapid heat dissipation function of the battery module.

[0057] It should be noted that all directional indications, such as upper, lower, left, right, front, back, etc., in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directional indications also change accordingly.

[0058] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element through a middle element.

[0059] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description and cannot be understood as indicating or implying the relative importance of the technical features indicated or the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0060] The above merely describes preferred embodiments of the present application, and is not intended to limit the patent scope of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields under the inventive concept of the present application, as described in the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

1. A battery module, characterized in that, include: Support assembly; Multiple cylindrical batteries are arranged along a first direction on the support assembly; as well as A first heat sink includes a base and a plurality of heat sinks, the base surrounding a radially side surface of the cylindrical battery, and the heat sinks being spaced apart on the side of the base away from the cylindrical battery.

2. The battery module according to claim 1, characterized in that, The heat sink includes a plurality of first plates and a plurality of second plates. The plurality of first plates are disposed at opposite ends of the base, and the plurality of first plates and the base form a groove. The plurality of second plates are disposed in the groove, and the thickness of the first plates is greater than the thickness of the second plates.

3. The battery module according to claim 1, characterized in that, The plurality of heat sinks are arranged in parallel to each other, and heat dissipation channels are formed between adjacent heat sinks.

4. The battery module according to claim 3, characterized in that, The extension direction of the heat dissipation channel is the same as the first direction.

5. The battery module according to claim 1, characterized in that, The battery module also includes a first silicone pad, which is disposed between the base and the cylindrical battery.

6. The battery module according to claim 1, characterized in that, The base is provided with multiple spaced limiting grooves, the cylindrical battery is assembled in the limiting grooves, and the base is inserted between adjacent cylindrical batteries to surround a portion of the sidewall of the cylindrical battery.

7. The battery module according to claim 6, characterized in that, The ratio of the depth of the base into the cylindrical battery to the diameter of the cylindrical battery is α, where 0.5 ≤ α ≤ 1.

8. The battery module according to any one of claims 1 to 7, characterized in that, The plurality of cylindrical batteries are arranged in at least three columns at intervals along the second direction, the first direction and the second direction are perpendicular to each other, and an air duct parallel to the first direction is formed between each adjacent column of cylindrical batteries. The battery module also includes a second heat sink, the base of which contacts the cylindrical batteries located in the first and last columns, and the second heat sink surrounds the radially side surfaces of the cylindrical batteries located in the remaining columns.

9. The battery module according to claim 8, characterized in that, The battery module also includes a second silicone pad, which is disposed between the second heat sink and the cylindrical battery.

10. The battery module according to claim 8, characterized in that, There are multiple second heat sinks, which are arranged between the cylindrical batteries along the first direction, and the opposite sides of the second heat sinks are arranged in the air duct.

11. The battery module according to claim 10, characterized in that, The ratio of the depth of the second heat sink surrounding the cylindrical battery to the diameter of the cylindrical battery is β, where 0.5 ≤ β ≤ 1.

12. The battery module according to any one of claims 1 to 7, characterized in that, The support assembly includes a first support and a second support. The first support has a first connecting post facing the second support, and the second support has a second connecting post facing the first support. The first connecting post and the second connecting post are connected together, and the first connecting post and / or the second connecting post clamps the base.

13. A battery pack, characterized in that, The battery pack includes a fan and a plurality of battery modules as described in any one of claims 1 to 12, wherein the fan is used to blow air toward the plurality of cylindrical batteries along the first direction.

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