Battery pack and electric device

Abstract

This application relates to the field of battery technology, specifically disclosing a battery pack and an electrical device. The battery pack includes: a housing, comprising a base plate and side beams, the side beams being arranged around the edge of the base plate, and the base plate and side beams cooperating to form a receiving cavity; multiple liquid cooling components disposed within the receiving cavity and connected to the base plate, each liquid cooling component extending perpendicularly to the base plate, at least three liquid cooling components cooperating to form a liquid cooling cavity, and multiple liquid cooling cavities being provided; and multiple cylindrical batteries, each cylindrical battery being disposed in a corresponding liquid cooling cavity, and the cylindrical batteries being thermally connected to the liquid cooling components forming the liquid cooling cavities. According to this application, the overall liquid cooling structure of the battery pack is optimized, improving the overall liquid cooling performance of the battery pack, which helps the battery pack match higher charge / discharge rates, improving the rate performance and safety performance of the battery pack; at the same time, it improves the volume utilization rate of the battery pack, thereby increasing the capacity of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] With the rapid development of mobile phones, laptops, electric vehicles, power tools, and other electronic devices, battery packs with high capacity, long cycle life, and high safety performance have been widely used and developed. At the same time, there is an urgent need for battery packs with even greater capacity, durability, and safety. Safety and capacity are among the core performance characteristics of battery packs. Therefore, how to improve the capacity of battery packs while simultaneously enhancing their safety performance has become a pressing issue that needs to be addressed. Utility Model Content

[0003] Embodiments of this application provide a battery pack and an electrical device to improve the safety performance of the battery pack and increase its capacity.

[0004] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0005] On one hand, a battery pack is provided, including: a housing, the housing including: a bottom plate and side beams, the side beams being arranged around the edge of the bottom plate, and the bottom plate and side beams cooperating to form a receiving cavity;

[0006] Multiple liquid cooling components are disposed within a receiving cavity and connected to a base plate. The extension direction of each liquid cooling component is perpendicular to the base plate. At least three liquid cooling components cooperate to form a liquid cooling cavity, and multiple liquid cooling cavities are provided.

[0007] Multiple cylindrical batteries are arranged in a corresponding liquid cooling cavity, and the cylindrical batteries are thermally connected to the liquid cooling components that surround the liquid cooling cavity.

[0008] In addition to one or more of the features disclosed above, or as an alternative, the liquid cooling component has multiple outer wall surfaces and corner portions, the multiple outer wall surfaces are distributed circumferentially along the liquid cooling component and are connected in pairs through the corner portions to form a closed surface, and the outer wall surfaces of at least three liquid cooling components cooperate to form a liquid cooling cavity.

[0009] The cylindrical battery has a first sidewall distributed along its circumference, which is thermally connected to the outer wall surface that forms the liquid-cooled cavity.

[0010] In addition to one or more of the features disclosed above, or as an alternative, the outer wall surfaces of the six liquid cooling components fit together to form a liquid cooling cavity.

[0011] In addition to one or more of the features disclosed above, or alternatively, the battery pack has a first orientation and a reference plane perpendicular to the first orientation;

[0012] The outer wall extends along a first direction, and along the first direction, the orthographic projection of the outer wall onto the reference plane is an arc shape.

[0013] In addition to one or more of the features disclosed above, or as an alternative, a first liquid cooling channel is provided in the liquid cooling component, a second liquid cooling channel is provided in the base plate, the second liquid cooling channel is connected to the first liquid cooling channel, and the cylindrical battery is thermally connected to the base plate.

[0014] In addition to one or more of the features disclosed above, or as an alternative, the cylindrical battery has a first sidewall and a second sidewall, the first sidewall being distributed circumferentially along the cylindrical battery, and the second sidewall being connected to the side of the first sidewall near the base plate, the second sidewall being thermally connected to the base plate.

[0015] In addition to one or more of the features disclosed above, or as an alternative, the battery pack further includes: a thermally conductive adhesive layer disposed between the first sidewall and the outer wall surface surrounding the liquid cooling cavity, and the thermally conductive adhesive layer is thermally connected to the first sidewall and the outer wall surface surrounding the liquid cooling cavity respectively.

[0016] In addition to one or more of the features disclosed above, or as an alternative, the liquid-cooled component is integrally formed with the base plate; or,

[0017] The liquid cooling component and the base plate are separate components, and the liquid cooling component and the base plate are fixedly connected.

[0018] In addition to one or more of the features disclosed above, or as an alternative, the battery pack also includes: an inlet pipe and an outlet pipe, both of which are disposed on the side beam, with the inlet pipe connected to the inlet end of the second liquid cooling channel and the outlet pipe connected to the outlet end of the second liquid cooling channel.

[0019] On the other hand, a further electrical device is disclosed, which, in addition to one or more of the features disclosed above, or as an alternative, includes a battery pack as described in any of the preceding claims, the battery pack serving as a power source for the electrical device.

[0020] One of the above technical solutions has the following advantages or beneficial effects: This application uses at least three liquid cooling components to form a liquid cooling cavity, with each cylindrical battery placed in a corresponding liquid cooling cavity. This allows multiple liquid cooling components to cover and dissipate heat from the cylindrical battery, increasing the actual heat dissipation area of ​​the cylindrical battery. This helps improve the liquid cooling efficiency of the cylindrical battery, thereby optimizing the overall liquid cooling structure of the battery pack, improving the overall liquid cooling performance of the battery pack, helping the battery pack match higher charge and discharge rates, reducing the temperature rise during normal operation of the battery pack, and improving the rate performance and safety performance of the battery pack. At the same time, it makes the overall component layout of the battery pack more compact, reducing the space occupied by the liquid cooling components, increasing the space occupied by the cylindrical battery, improving the volume utilization rate of the battery pack, and thus increasing the capacity of the battery pack. In addition, the cylindrical battery and the liquid cooling components form an integral structure, which is beneficial to improving the overall mode of the battery pack, and improving the overall structural strength and structural stability of the battery pack. Attached Figure Description

[0021] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0022] Figure 1 This is a three-dimensional structural view of the battery pack provided according to an embodiment of this application;

[0023] Figure 2 This is an exploded view of a battery pack according to an embodiment of this application;

[0024] Figure 3 This is a structural diagram of a cylindrical battery provided according to an embodiment of this application;

[0025] Figure 4 This is a top view of the housing, cylindrical battery, and liquid cooling component provided according to embodiments of this application;

[0026] Figure 5 yes Figure 4 Partial cross-sectional view of the middle casing, cylindrical battery and liquid cooling components along the AA direction;

[0027] Figure 6 This is a top view of the housing and liquid cooling component provided according to an embodiment of this application;

[0028] Figure 7 yes Figure 6 A magnified view of a section at point C;

[0029] Figure 8 yes Figure 6 Partial sectional view of the middle housing and liquid cooling components along the BB direction.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100. Battery pack; 110. Housing; 111. Base plate; 112. Side beam; 113. Receiving cavity; 114. Second liquid cooling channel; 120. Battery pack; 121. Cylindrical battery; 1211. First side wall; 1212. Second side wall; 130. Liquid cooling component; 131. Outer wall surface; 132. Angular portion; 133. First liquid cooling channel; 134. Liquid cooling cavity; 140. Thermally conductive adhesive layer; 150. Liquid inlet pipe; 160. Liquid outlet pipe; 170. Housing cover. Detailed Implementation

[0032] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0033] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] Battery packs require thermal management components to manage the battery's temperature and ensure it operates within its optimal temperature range, thus maximizing performance and lifespan. Existing battery packs using cylindrical cell packaging have limited contact area between the cylindrical cells and liquid cooling components, resulting in limited heat exchange efficiency. This may pose significant safety risks and impact the battery pack's safety performance. Furthermore, the complex assembly of the battery pack leads to low volume utilization and high production costs.

[0037] To address at least one of the aforementioned problems, in embodiments of this application, reference is made to... Figures 1 to 2 This application provides a battery pack 100 having a first direction Z, a second direction X, and a third direction Y that are perpendicular to each other. "Perpendicular" refers to an angle of 89° to 91° formed by two lines, a line and a surface, or two surfaces.

[0038] For example, the first direction Z is the height direction of the battery pack 100, the second direction X is the width direction of the battery pack 100, and the third direction Y is the length direction of the battery pack 100.

[0039] Specifically, refer to Figures 1 to 2 The battery pack 100 includes: a housing 110, a liquid cooling component 130, a cylindrical battery 121, and a housing cover 170.

[0040] Specifically, the housing 110 includes a base plate 111 and side beams 112. The side beams 112 are arranged around the edge of the base plate 111, and the base plate 111 and the side beams 112 cooperate to form a receiving cavity 113. Multiple liquid cooling components 130 are provided, each disposed within the receiving cavity 113 and connected to the base plate 111. The extension direction of each liquid cooling component 130 is perpendicular to the base plate 111. At least three liquid cooling components 130 cooperate to form a liquid cooling cavity 134. The liquid cooling cavity 134 can be formed by four liquid cooling components 130 or five liquid cooling components 130, but it is not limited to these. As long as there are three or more liquid cooling components, multiple liquid cooling cavities 134 can be provided. Multiple cylindrical batteries 121 are provided, and each cylindrical battery 121 is provided in a corresponding liquid cooling cavity 134. The cylindrical battery 121 is thermally connected to the liquid cooling components 130 forming the liquid cooling cavity 134. The cover 170 is fixedly connected to the box body 110 to seal the box body 110.

[0041] The battery pack 100 can be a three-tiered battery pack 100 consisting of cylindrical batteries, battery modules, and a battery pack. Specifically, cylindrical batteries 121 are first grouped into battery modules, and then the battery modules are placed inside the housing 110 to form the battery pack 100. Alternatively, it can be a two-tiered battery pack 100 consisting of cylindrical batteries and a battery pack, where the cylindrical batteries 121 are directly housed inside the housing 110 to form the battery pack. No specific limitations are imposed in this application; the design can be tailored to the specific circumstances, as long as it does not affect the effectiveness of this application.

[0042] The box body 110 is made of ordinary steel or aluminum, and the box cover 170 is made of metal, but not limited to these.

[0043] The enclosure 110 and the cover 170 are welded together to ensure the overall sealing performance of the enclosure 110.

[0044] The cylindrical battery 121 can be a rechargeable battery, which refers to a single-cell battery that can be recharged to activate the active materials and continue to be used after the single-cell battery has been discharged. For example, the cylindrical battery 121 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, or nickel-cadmium battery, but is not limited to these.

[0045] The cylindrical battery 121 includes electrode components, electrolyte, casing, end caps, terminals, and other functional components. The electrolyte can be a conventional electrolyte or a special electrolyte with additives, used to wet the electrode components. The electrode components are the parts in the cylindrical battery 121 where electrochemical reactions occur, and there can be one or more electrode components. The electrode components are mainly formed by stacking or winding positive electrode sheets, separators, and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the electrode body, while the portions of the positive and negative electrode sheets without active material each constitute a tab. During the charging and discharging process of the cylindrical battery 121, the positive and negative active materials react with the electrolyte, and the tabs and terminals are electrically connected to form a current loop, enabling the cylindrical battery 121 to function normally.

[0046] The liquid cooling component 130 is made of a thermally conductive material. For example, the liquid cooling component 130 may be made of copper, aluminum or stainless steel, but is not limited to this.

[0047] Understandably, this application utilizes at least three liquid cooling components 130 to form a liquid cooling cavity 134, with each cylindrical battery 121 positioned within a corresponding liquid cooling cavity 134. This allows the multiple liquid cooling components 130 to enclose and dissipate heat from the cylindrical battery 121, increasing its actual heat dissipation area and improving its liquid cooling efficiency. This optimizes the overall liquid cooling structure of the battery pack 100, enhances its overall liquid cooling performance, and helps the battery pack 100 match higher charge / discharge rates. It also reduces the temperature rise during normal operation, improving the rate performance and safety performance of the battery pack 100. Simultaneously, it makes the overall component layout of the battery pack 100 more compact. This design reduces the space occupied by the liquid cooling component 130, increases the space occupied by the cylindrical battery 121, improves the volume utilization of the battery pack 100, and thus increases the capacity of the battery pack 100. Simultaneously, the cylindrical battery 121 and the liquid cooling component 130 form an integrated structure, which helps improve the overall modality of the battery pack 100, enhancing its overall structural strength and stability. Furthermore, the cylindrical battery 121 in this application can be directly installed in a corresponding liquid cooling cavity 134 without the need for other complex tooling fixtures, simplifying the assembly process, reducing the production efficiency of the battery pack 100, and lowering its production cost.

[0048] In some embodiments, refer to Figure 2Multiple cylindrical batteries 121 are arranged along the second direction X to form a battery pack 120. The number of battery packs 120 is set to multiple. The multiple battery packs 120 are arranged along the third direction Y, and the adjacent cylindrical batteries 121 in two adjacent battery packs 120 are staggered to further optimize the overall liquid cooling structure of the battery pack 100, improve the overall liquid cooling performance of the battery pack 100, help the battery pack 100 match higher charging rates, reduce the temperature rise of the battery pack 100 during normal operation, and improve the rate performance and safety performance of the battery pack 100.

[0049] In some embodiments, refer to Figures 3 to 8 The liquid cooling component 130 has multiple outer wall surfaces 131 and corner portions 132. The multiple outer wall surfaces 131 are distributed circumferentially along the liquid cooling component 130 and are connected in pairs through the corner portions 132 to form a closed surface. The outer wall surfaces 131 of at least three liquid cooling components 130 cooperate to form a liquid cooling cavity 134.

[0050] The outer wall surface 131 and the corner portion 132 can be integrally formed, meaning they are a single, integrated structure. Alternatively, the outer wall surface 131 and the corner portion 132 can be separately configured and fixedly connected. For example, the corner portion 132 is fixedly connected to the outer wall surface 131 via welding or other processes. This application does not impose specific limitations and can be configured according to actual circumstances. For example, in this application, the outer wall surface 131 and the corner portion 132 are integrally die-cast.

[0051] Specifically, the cylindrical battery 121 has a first sidewall 1211 distributed along its circumference. The first sidewall 1211 is thermally connected to the outer wall surface 131 of the liquid cooling cavity 134, which helps to improve the liquid cooling efficiency of the cylindrical battery 121, thereby optimizing the overall liquid cooling structure of the battery pack 100, improving the overall liquid cooling performance of the battery pack 100, helping the battery pack 100 to match higher charge and discharge rates, reducing the temperature rise of the battery pack 100 during normal operation, and improving the rate performance and safety performance of the battery pack 100.

[0052] In some embodiments, refer to Figures 6 to 7 The outer wall surfaces 131 of the six liquid cooling components 130 cooperate to form a liquid cooling cavity 134, which further increases the actual heat dissipation area of ​​the cylindrical battery 121, helps to improve the liquid cooling efficiency of the cylindrical battery 121, thereby optimizing the overall liquid cooling structure of the battery pack 100, improving the overall liquid cooling performance of the battery pack 100, helping the battery pack 100 to match higher charge and discharge rates, reducing the temperature rise of the battery pack 100 during normal operation, and improving the rate performance and safety performance of the battery pack 100; at the same time, it is also conducive to improving the overall mode of the battery pack 100, and improving the overall structural strength and structural stability of the battery pack 100.

[0053] In some embodiments, the battery pack 100 further has a reference plane P perpendicular to the first direction Z.

[0054] Specifically, refer to Figures 6 to 7 The outer wall surface 131 extends along the first direction Z, and the orthographic projection of the outer wall surface 131 on the reference plane P along the first direction Z is arc-shaped, so that the outer wall surface 131 can be fitted with the first side wall 1211 of the cylindrical battery 121. This further helps to increase the actual heat dissipation area of ​​the cylindrical battery 121, which helps to improve the liquid cooling efficiency of the cylindrical battery 121. This optimizes the overall liquid cooling structure of the battery pack 100, improves the overall liquid cooling performance of the battery pack 100, helps the battery pack 100 match higher charge and discharge rates, reduces the temperature rise of the battery pack 100 during normal operation, and improves the rate performance and safety performance of the battery pack 100. At the same time, it further helps to improve the overall mode of the battery pack 100, and improves the overall structural strength and structural stability of the battery pack 100.

[0055] In some embodiments, refer to Figures 4 to 5 The liquid cooling component 130 has a first liquid cooling channel 133, and the base plate 111 has a second liquid cooling channel 114. The second liquid cooling channel 114 is connected to the first liquid cooling channel 133. Both the first liquid cooling channel 133 and the second liquid cooling channel 114 are used to circulate coolant. The cylindrical battery 121 is thermally connected to the base plate 111 to further increase the actual heat dissipation area of ​​the cylindrical battery 121 and improve the liquid cooling efficiency of the cylindrical battery 121. This optimizes the overall liquid cooling structure of the battery pack 100, improves the overall liquid cooling performance of the battery pack 100, and helps the battery pack 100 match higher charge and discharge rates, thereby improving the rate performance and safety performance of the battery pack 100.

[0056] In some embodiments, refer to Figures 3 to 5 The cylindrical battery 121 also has a second sidewall 1212, which is connected to the side of the first sidewall 1211 near the base plate 111. The second sidewall 1212 is thermally connected to the base plate 111 to further increase the actual heat dissipation area of ​​the cylindrical battery 121 and improve the liquid cooling efficiency of the cylindrical battery 121. This optimizes the overall liquid cooling structure of the battery pack 100, improves the overall liquid cooling performance of the battery pack 100, and helps the battery pack 100 match higher charge and discharge rates, thereby improving the rate performance and safety performance of the battery pack 100.

[0057] The second sidewall 1212 of the cylindrical battery 121 can be directly connected to the base plate 111. Thermally conductive structural adhesive can also be filled between the second sidewall 1212 of the cylindrical battery 121 and the base plate 111, and the thermally conductive structural adhesive can be used to indirectly connect them, thereby achieving a thermally conductive connection between the second sidewall 1212 of the cylindrical battery 121 and the base plate 111.

[0058] In some embodiments, in order to improve the thermal conductivity between the cylindrical battery 121 and the liquid cooler 130, in this application, reference is made to... Figures 4 to 5 The battery pack 100 also includes a thermally conductive adhesive layer 140, which is disposed between the first sidewall 1211 and the outer wall surface 131 forming the liquid cooling cavity 134, and the thermally conductive adhesive layer 140 is thermally connected to the first sidewall 1211 and the outer wall surface 131 forming the liquid cooling cavity 134 respectively.

[0059] The thermally conductive adhesive layer 140 can be made of any one of silicone thermally conductive adhesive, polyurethane thermally conductive adhesive, silicone potting compound thermally conductive adhesive, or acrylic thermally conductive adhesive, but is not limited to this.

[0060] This application optimizes the thermal conductivity between the cylindrical battery 121 and the liquid cooling component 130 by providing a thermally conductive adhesive layer 140 between the first sidewall 1211 and the outer wall surface 131 forming the liquid cooling cavity 134. This improves the heat transfer efficiency between the cylindrical battery 121 and the liquid cooling component 130, ensuring that the liquid cooling component 130 efficiently cools the cylindrical battery 121. This further enhances the heat dissipation efficiency of the cylindrical battery 121 and improves the heat dissipation capacity of the cylindrical battery 121 in the battery pack 100, thus ensuring the safety performance of the battery pack 100.

[0061] In some embodiments, the liquid cooling component 130 and the base plate 111 are integrally formed, that is, the liquid cooling component 130 and the base plate 111 can be made of the same material by casting or stamping, which facilitates processing, reduces processing steps, improves the production efficiency of the liquid cooling component 130 and the base plate 111, and thus improves the overall production efficiency of the battery pack 100.

[0062] In other embodiments, the liquid cooling component 130 and the base plate 111 are separately disposed, and the liquid cooling component 130 and the base plate 111 are fixedly connected. That is, the liquid cooling component 130 and the base plate 111 can be formed of different materials to facilitate the overall assembly of the battery pack 100 and improve the assembly efficiency of the battery pack 100.

[0063] In some embodiments, in order to improve the liquid cooling control efficiency of the battery pack 100, in this application, reference is made to... Figure 2 , Figures 4 to 5 The battery pack 100 also includes an inlet pipe 150 and an outlet pipe 160. Both the inlet pipe 150 and the outlet pipe 160 are disposed on the side beam 112. The inlet pipe 150 is connected to the inlet end of the second liquid cooling channel 114, and the outlet pipe 160 is connected to the outlet end of the second liquid cooling channel 114.

[0064] The inlet pipe 150 and the outlet pipe 160 are both connected to an external liquid storage device of the battery pack 100, which is used to provide coolant.

[0065] Specifically, the coolant in the storage device is delivered to the inlet pipe 150. The coolant from the inlet pipe 150 enters the second liquid cooling channel 114, and then enters the first liquid cooling channel 133 in the liquid cooling component 130. The coolant in the first liquid cooling channel 133 flows back to the second liquid cooling channel 114 to circulate within the liquid cooling component 130 and the base plate 111 for liquid cooling heat dissipation. The coolant in the second liquid cooling channel 114 is discharged to the outlet pipe 160. The coolant from the outlet pipe 160 is then discharged back to the storage device to form a liquid cooling cycle.

[0066] This application improves the cooling control efficiency of the battery pack 100 by setting up an inlet pipe 150 and an outlet pipe 160 to achieve synchronous control of multiple first liquid cooling channels 133 and second liquid cooling channels 114.

[0067] On the other hand, in the embodiments of this application, this application also provides an electrical device, including: a battery pack 100 as described in any of the above embodiments, wherein the battery pack 100 serves as a power supply for the electrical device.

[0068] Among them, electrical devices may include, but are not limited to, mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0069] The above steps are provided only to help understand the method, structure, and core ideas of this application. Those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A battery pack, characterized in that, include: The box body includes a bottom plate and side beams, the side beams being arranged around the edge of the bottom plate, and the bottom plate and side beams cooperating to form a receiving cavity; Multiple liquid cooling components are disposed within the receiving cavity and connected to the base plate. The extension direction of each liquid cooling component is perpendicular to the base plate. At least three liquid cooling components cooperate to form a liquid cooling cavity, and multiple liquid cooling cavities are provided. Multiple cylindrical batteries are disposed in a corresponding liquid cooling cavity, and the cylindrical batteries are thermally connected to the liquid cooling components surrounding the liquid cooling cavity.

2. The battery pack as described in claim 1, characterized in that, The liquid cooling component has multiple outer wall surfaces and corner portions. The multiple outer wall surfaces are distributed along the circumference of the liquid cooling component and are connected in pairs through the corner portions to form a closed surface. The outer wall surfaces of at least three of the liquid cooling components cooperate to form the liquid cooling cavity. The cylindrical battery has a first sidewall distributed along its circumference, the first sidewall being thermally connected to the outer wall surface surrounding the liquid-cooled cavity.

3. The battery pack as described in claim 2, characterized in that, The outer wall surfaces of the six liquid cooling components fit together to form the liquid cooling cavity.

4. The battery pack as described in claim 2, characterized in that, The battery pack has a first direction and a reference plane perpendicular to the first direction; The outer wall extends along the first direction, and along the first direction, the orthographic projection of the outer wall onto the reference plane is an arc shape.

5. The battery pack as described in claim 1, characterized in that, The liquid cooling component has a first liquid cooling channel, and the base plate has a second liquid cooling channel. The second liquid cooling channel is connected to the first liquid cooling channel, and the cylindrical battery is thermally connected to the base plate.

6. The battery pack as described in claim 5, characterized in that, The cylindrical battery has a first sidewall and a second sidewall. The first sidewall is distributed along the circumference of the cylindrical battery, and the second sidewall is connected to the side of the first sidewall near the base plate. The second sidewall is thermally connected to the base plate.

7. The battery pack as described in claim 2, characterized in that, The battery pack further includes a thermally conductive adhesive layer disposed between the first sidewall and the outer wall surface surrounding the liquid cooling cavity, and the thermally conductive adhesive layer is thermally connected to the first sidewall and the outer wall surface surrounding the liquid cooling cavity respectively.

8. The battery pack as claimed in claim 1, characterized in that, The liquid cooling component is integrally formed with the base plate; or... The liquid cooling component is separately disposed from the base plate, and the liquid cooling component is fixedly connected to the base plate.

9. The battery pack as described in claim 5, characterized in that, The battery pack further includes an inlet pipe and an outlet pipe, both of which are disposed on the side beam. The inlet pipe is connected to the inlet end of the second liquid cooling channel, and the outlet pipe is connected to the outlet end of the second liquid cooling channel.

10. An electrical device, characterized in that, include: The battery pack as described in any one of claims 1 to 9, wherein the battery pack serves as the power supply for the electrical device.

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