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 with a receiving cavity; a first battery group disposed in the receiving cavity, and the first battery group includes: a plurality of first individual cells arranged along a first direction; a second battery group disposed in the receiving cavity, the second battery group and the first battery group being arranged adjacent to each other along a second direction, the second battery group including: a plurality of second individual cells arranged along the first direction; a first liquid cooling component covering the outer surface of each first individual cell, and a portion of the first liquid cooling component being in contact with the second individual cells; and a second liquid cooling component, the second liquid cooling component and the first liquid cooling component being arranged along the second direction, the second liquid cooling component covering the outer surface of each second individual cell. 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, and enhancing the rate performance and safety performance 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 the new energy industry, battery packs with high energy density, long cycle life, and high safety performance have been widely used and developed, and the demand for battery packs with larger capacity, greater durability, and enhanced safety is extremely urgent. Safety performance is one of the core performance characteristics of a battery pack, and the liquid cooling performance of the battery pack directly affects its safety performance. Therefore, how to improve the liquid cooling performance of battery packs, thereby enhancing their safety performance, has become a pressing issue that needs to be addressed. Utility Model Content

[0003] The embodiments of this application provide a battery pack and an electrical device to improve the overall liquid cooling performance of the battery pack, thereby improving the rate performance and safety performance of the battery pack.

[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 having a first direction and a second direction that are perpendicular to each other, including:

[0006] The box body is equipped with a receiving cavity;

[0007] A first battery pack is disposed in a receiving cavity, and the first battery pack includes a plurality of first individual cells arranged along a first direction;

[0008] The second battery pack is disposed in the receiving cavity. The second battery pack and the first battery pack are arranged adjacent to each other along the second direction. The second battery pack includes a plurality of second individual cells arranged along the first direction.

[0009] A first liquid cooling element is disposed within a receiving cavity, covering the outer surface of each first individual battery cell, and a portion of the first liquid cooling element is in contact with and connected to a second individual battery cell; and

[0010] The second liquid cooling component is disposed in the receiving cavity. The second liquid cooling component and the first liquid cooling component are arranged along the second direction. The second liquid cooling component covers the outer surface of each second single cell.

[0011] In addition to one or more features disclosed above, or as an alternative, the first liquid cooling component includes: a first liquid cooling section and a second liquid cooling section connected to each other, the first liquid cooling section having a first liquid cooling tank, the second liquid cooling section having a second liquid cooling tank, the openings of the first liquid cooling tank and the second liquid cooling tank facing opposite directions, and at least one first single cell battery being disposed in the first liquid cooling tank and the second liquid cooling tank respectively.

[0012] The second liquid cooling section is in contact with the outer surface of the second individual battery cell.

[0013] In addition to one or more features disclosed above, or as an alternative, multiple first liquid cooling units and multiple second liquid cooling units are provided, and the multiple first liquid cooling units and multiple second liquid cooling units are arranged alternately in the first direction;

[0014] Each first liquid cooling tank and each second liquid cooling tank is provided with at least one first single cell, and each second liquid cooling part is in contact with the outer surface of the corresponding second single cell.

[0015] In addition to one or more of the features disclosed above, or as an alternative, a portion of the second liquid cooler is in contact with the outer surface of the first single cell.

[0016] In addition to one or more of the features disclosed above, or as an alternative, the second liquid cooling component includes: a third liquid cooling section and a fourth liquid cooling section connected to each other, the third liquid cooling section having a third liquid cooling tank, the fourth liquid cooling section having a fourth liquid cooling tank, the openings of the third liquid cooling tank and the fourth liquid cooling tank facing opposite directions, at least one second single cell being disposed in the third liquid cooling tank and the fourth liquid cooling tank respectively, and the fourth liquid cooling section being in contact with the outer surface of the first single cell.

[0017] In addition to one or more of the features disclosed above, or as an alternative, multiple third liquid cooling units and multiple fourth liquid cooling units are provided, and the multiple third liquid cooling units and multiple fourth liquid cooling units are arranged alternately in the first direction;

[0018] Each of the third and fourth liquid cooling tanks is provided with at least one second single cell, and each of the fourth liquid cooling sections is in contact with the outer surface of a corresponding first single cell.

[0019] In addition to one or more of the features disclosed above, or alternatively, the first liquid cooling tank is connected to the fourth liquid cooling tank to form a first liquid cooling space, and / or,

[0020] The second liquid cooling tank is connected to the third liquid cooling tank to form a second liquid cooling space.

[0021] In addition to one or more of the features disclosed above, or as an alternative, a portion of the first liquid cooling section is in contact with the fourth liquid cooling section, and a portion of the second liquid cooling section is in contact with the third liquid cooling section.

[0022] In addition to one or more of the features disclosed above, or as an alternative, the first liquid cooling component is provided with a first liquid inlet and a first liquid outlet, and the second liquid cooling component is provided with a second liquid inlet and a second liquid outlet.

[0023] The battery pack also includes a main liquid inlet pipe and a main liquid outlet pipe, the main liquid inlet pipe being connected to the first liquid inlet and the second liquid inlet, and the main liquid outlet pipe being connected to the first liquid outlet and the second liquid outlet.

[0024] 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.

[0025] One of the above technical solutions has the following advantages or beneficial effects: This application provides a first liquid cooling component on the outer surface of the first single cell to dissipate heat from the first single cell through liquid cooling. A second liquid cooling component is provided on the outer surface of the second single cell, with a portion of the first liquid cooling component in contact with the second single cell, allowing for simultaneous liquid cooling of the second single cell by both components. This increases the actual heat dissipation area of ​​the second single cell, improves its liquid cooling efficiency, optimizes the overall liquid cooling structure of the battery pack, enhances its overall liquid cooling performance, helps the battery pack match higher charging rates, reduces temperature rise during normal operation, and improves its rate performance and safety performance. Simultaneously, the first liquid cooling component provides auxiliary fixation for the second single cell, making the overall battery pack structure compact and stable, thus improving the overall structural stability of the battery pack. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is an exploded structural view of a battery pack according to an embodiment of this application;

[0028] Figure 2 This is a three-dimensional structural diagram of the first battery pack, the first liquid cooler, the second battery pack, and the second liquid cooler provided according to the embodiments of this application;

[0029] Figure 3 This is a top view of the first battery pack, the first liquid cooler, the second battery pack, and the second liquid cooler provided according to embodiments of this application;

[0030] Figure 4 This is an exploded structural diagram of the first battery pack, the first liquid cooler, the second battery pack, and the second liquid cooler according to embodiments of this application.

[0031] Figure 5 This is an exploded top view of the first battery pack, the first liquid cooler, the second battery pack, and the second liquid cooler provided according to embodiments of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Battery pack; 110. Housing; 111. Receiving cavity; 120. First battery pack; 121. First single cell; 1211. First outer wall; 130. First liquid cooling component; 131. First liquid cooling section; 1311. First liquid cooling tank; 132. Second liquid cooling section; 1321. Second liquid cooling tank; 133. First liquid inlet; 134. First liquid outlet; 140. Second battery pack; 141. Second single cell; 1411. Second outer wall; 150. Second liquid cooling component; 151. Third liquid cooling section; 1511. Third liquid cooling tank; 152. Fourth liquid cooling section; 1521. Fourth liquid cooling tank; 153. Second liquid inlet; 154. Second liquid outlet; 160. Housing cover. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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. As demands for charging speed increase, existing battery packs are continuously raising their charge / discharge rates, leading to increased heat generation and a greater need for cooling. However, the limited contact area between the battery and liquid cooling components in current battery packs results in limited heat exchange efficiency. When using higher charge / discharge rates, the liquid cooling components' heat dissipation efficiency remains limited, leading to insufficient liquid cooling performance and potentially posing significant safety risks to the battery pack.

[0039] To address the aforementioned problems, in the embodiments of this application, reference is made to... Figure 1 This application provides a battery pack 100 having a first direction X, a second direction Y, and a third direction Z 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.

[0040] Specifically, refer to Figures 1 to 3 The battery pack 100 includes: a housing 110, a first battery pack 120, a second battery pack 140, a first liquid cooling component 130, a second liquid cooling component 150, and a housing cover 160.

[0041] Specifically, the housing 110 is provided with a receiving cavity 111; a first battery pack 120 is disposed in the receiving cavity 111, and the first battery pack 120 includes a plurality of first individual cells 121 arranged along a first direction X; a second battery pack 140 is disposed in the receiving cavity 111, and the second battery pack 140 and the first battery pack 120 are arranged adjacent to each other along a second direction Y, the second battery pack 140 includes a plurality of second individual cells 141 arranged along the first direction X; a first liquid cooling component 130 is disposed in the receiving cavity 111, the first liquid cooling component 130 covers the outer surface of each first individual cell 121, the first liquid cooling component 130 is thermally connected to each first individual cell 121, and part of the first liquid cooling component 130 is connected to the second individual cells. For example, in the 141 contact connection, a portion of the first liquid cooling component 130 can be directly contacted with the second single cell 141, and a portion of the first liquid cooling component 130 and the second single cell 141 can also be filled with thermally conductive structural adhesive, thereby achieving a thermally conductive connection between the first liquid cooling component 130 and the second single cell 141; the second liquid cooling component 150 is disposed in the receiving cavity 111, and the second liquid cooling component 150 and the first liquid cooling component 130 are arranged along the second direction Y, the second liquid cooling component 150 covers the outer surface of each second single cell 141, and the second liquid cooling component 150 is thermally connected to each second single cell 141; the cover 160 is fixedly connected to the housing 110 to seal the housing 110.

[0042] The battery pack 100 can be a three-tiered battery pack 100 consisting of a single cell, a battery module, and a battery pack. Specifically, the first single cell 121 and the second single cell 141 are first grouped into a battery module, and then the battery module is placed inside the housing 110 to form the battery pack 100. Alternatively, it can be a two-tiered battery pack 100 consisting of a single cell and a battery pack, where the first single cell 121 and the second single cell 141 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.

[0043] The box body 110 is made of ordinary steel or aluminum, and the box cover 160 is made of metal, but not limited to these.

[0044] The enclosure 110 and the cover 160 are welded together to ensure the overall sealing performance of the enclosure 110.

[0045] Both the first single-cell battery 121 and the second single-cell battery 141 can be rechargeable batteries. A rechargeable battery is a single-cell battery that can be recharged after discharge to activate the active materials and continue to be used. For example, the first single-cell battery 121 and the second single-cell battery 141 can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, or nickel-cadmium batteries, but are not limited to these.

[0046] Both the first single-cell battery 121 and the second single-cell battery 141 can be prismatic batteries, pouch batteries, or batteries of other shapes. For example, in this application, both the first single-cell battery 121 and the second single-cell battery 141 are cylindrical lithium-ion batteries.

[0047] Both the first single-cell battery 121 and the second single-cell battery 141 include electrode assemblies, electrolyte, casing, end caps, terminals, and other functional components. The electrolyte can be a conventional electrolyte or a special electrolyte with added additives, used to wet the electrode assemblies. The electrode assemblies are the components in the first single-cell battery 121 and the second single-cell battery 141 where electrochemical reactions occur, and there can be one or more electrode assemblies. The electrode assemblies 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 first single-cell battery 121 and the second single-cell battery 141, 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 first single-cell battery 121 and the second single-cell battery 141 to function normally.

[0048] The first liquid cooling component 130 and the second liquid cooling component 150 are both made of thermally conductive materials. For example, the first liquid cooling component 130 and the second liquid cooling component 150 can be made of any one of copper, aluminum or stainless steel, but are not limited thereto.

[0049] Understandably, this application utilizes a first liquid cooling component 130 on the outer surface of the first single-cell battery 121 to provide liquid cooling for the first single-cell battery 121. A second liquid cooling component 150 is provided on the outer surface of the second single-cell battery 141, with a portion of the first liquid cooling component 130 in contact with the second single-cell battery 141. This allows the first and second liquid cooling components 130 and 150 to simultaneously provide liquid cooling for the second single-cell battery 141, increasing the actual heat dissipation area of ​​the second single-cell battery 141 and improving its liquid cooling efficiency. This optimizes the overall liquid cooling structure of the battery pack 100, improves its overall liquid cooling performance, helps the battery pack 100 match higher charging rates, reduces temperature rise during normal operation, and enhances its rate performance and safety performance. Simultaneously, the first liquid cooling component 130 provides auxiliary fixation for the second single-cell battery 141, making the overall structure of the battery pack 100 compact and stable, thus improving its overall structural stability.

[0050] In some embodiments, refer to Figures 3 to 5 The first liquid cooling component 130 includes a first liquid cooling section 131 and a second liquid cooling section 132 connected to each other. The first liquid cooling section 131 has a first liquid cooling tank 1311, and the second liquid cooling section 132 has a second liquid cooling tank 1321. The openings of the first liquid cooling tank 1311 and the second liquid cooling tank 1321 face opposite directions. At least one first single cell battery 121 is respectively disposed in the first liquid cooling tank 1311 and the second liquid cooling tank 1321, so as to use the first liquid cooling section 131 and the second liquid cooling section 132 to dissipate heat from the first single cell battery 121 by liquid cooling, thereby 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.

[0051] The first liquid cooling section 131 and the second liquid cooling section 132 can be integrally formed, meaning they are a single, integrated structure. Alternatively, the first liquid cooling section 131 and the second liquid cooling section 132 can be separately configured and fixedly connected. For example, the second liquid cooling section 132 is fixedly connected to the first liquid cooling section 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 first liquid cooling section 131 and the second liquid cooling section 132 are integrally die-cast.

[0052] Specifically, the second liquid cooling section 132 is in contact with the outer surface of the second single cell 141. For example, the second liquid cooling section 132 can be in direct contact with the second single cell 141, and thermally conductive structural adhesive can also be filled between the second liquid cooling section 132 and the second single cell 141 for indirect contact connection, thereby achieving thermally conductive connection between the second liquid cooling section 132 and the second single cell 141.

[0053] Understandably, this application connects the second liquid cooling section 132 to the outer surface of the second single cell 141 to simultaneously dissipate heat from the second single cell 141 using the second liquid cooling section 132 and the second liquid cooling component 150. This increases the actual heat dissipation area of ​​the second single cell 141, improves the liquid cooling efficiency of the second single cell 141, 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 charging rates, reducing the temperature rise during normal operation of the battery pack 100, and improving the rate performance and safety performance of the battery pack 100. At the same time, the second liquid cooling section 132 has an auxiliary fixing function for the second single cell 141, making the overall structure of the battery pack 100 compact and stable, and improving the overall structural stability of the battery pack 100.

[0054] In some embodiments, refer to Figures 3 to 5 Multiple first liquid cooling sections 131 and multiple second liquid cooling sections 132 are provided, and the multiple first liquid cooling sections 131 and multiple second liquid cooling sections 132 are arranged alternately in the first direction X. At least one first single cell 121 is provided in each first liquid cooling tank 1311 and each second liquid cooling tank 1321, and each second liquid cooling section 132 is in contact with the outer surface of a corresponding second single cell 141, so as 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 a higher charging rate, 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.

[0055] In some embodiments, the first single cell 121 has a circumferential direction R around a third direction Z.

[0056] Specifically, the first single cell 121 has a first outer wall surface 1211, which extends along the circumferential direction R. The first liquid cooling part 131 and the second liquid cooling part 132 both cover a portion of the first outer wall surface 1211.

[0057] Specifically, the contact area between the first liquid cooling section 131 and the first outer wall surface 1211 is S1 mm. 2 The contact area between the second liquid cooling section 132 and the first outer wall surface 1211 is S2 mm. 2 The surface area of ​​the first outer wall surface 1211 is S3 mm. 2 The following conditions are met: S1 / S3 = 0.5, S2 / S3 = 0.5, to improve the liquid cooling efficiency of the first single cell 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 charging 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.

[0058] The contact area S1 mm between the first liquid cooling section 131 and the first outer wall surface 1211 is... 2 After disassembling the actual battery pack 100, firstly, using measuring tools, the length of the contact area between the first liquid cooling section 131 and the first outer wall surface 1211 in the circumferential direction R is measured multiple times, and the average value is calculated. Then, using measuring tools, the height of the contact area between the first liquid cooling section 131 and the first outer wall surface 1211 is measured multiple times, and the average value is calculated. Finally, using the length of the contact area between the first liquid cooling section 131 and the first outer wall surface 1211 in the circumferential direction R, the height of the contact area between the first liquid cooling section 131 and the first outer wall surface 1211, and the calculation formula, the contact area S1 mm between the first liquid cooling section 131 and the first outer wall surface 1211 is calculated. 2 The measuring tool can be any of a ruler, vernier caliper, or other dimensional measuring instruments, but is not limited to these.

[0059] The contact area between the second liquid cooling section 132 and the first outer wall surface 1211 is S2 mm. 2 The surface area of ​​the first outer wall surface 1211 is S3 mm. 2 The measurement method is based on the contact area S1 mm between the first liquid cooling part 131 and the first outer wall surface 1211. 2 The measurement method is the same, and will not be elaborated here. Please refer to the description above.

[0060] In some embodiments, refer to Figures 3 to 5 A portion of the second liquid cooling component 150 is in contact with the outer surface of the first single cell 121. For example, a portion of the second liquid cooling component 150 can be in direct contact with the first single cell 121, and a portion of the second liquid cooling component 150 and the first single cell 121 can be filled with thermally conductive structural adhesive, thereby achieving thermally conductive connection between the second liquid cooling component 150 and the first single cell 121 through indirect contact connection using thermally conductive structural adhesive.

[0061] Understandably, this application connects a portion of the second liquid cooling component 150 to the first single-cell battery 121 through contact, thereby utilizing the first liquid cooling component 130 and the second liquid cooling component 150 to simultaneously cool and dissipate heat from the first single-cell battery 121. This increases the actual heat dissipation area of ​​the first single-cell battery 121, improves the liquid cooling efficiency of the first single-cell battery 121, and further optimizes the overall liquid cooling structure of the battery pack 100. This further enhances the overall liquid cooling performance of the battery pack 100, helps the battery pack 100 match higher charging rates, further reduces the temperature rise during normal operation of the battery pack 100, and improves the rate performance and safety performance of the battery pack 100. At the same time, the second liquid cooling component 150 has an auxiliary fixing function for the first single-cell battery 121, further making the overall structure of the battery pack 100 compact and stable, and improving the overall structural stability of the battery pack 100.

[0062] In some embodiments, refer to Figures 3 to 5 The second liquid cooling component 150 includes a third liquid cooling section 151 and a fourth liquid cooling section 152 connected to each other. The third liquid cooling section 151 has a third liquid cooling tank 1511, and the fourth liquid cooling section 152 has a fourth liquid cooling tank 1521. The openings of the third liquid cooling tank 1511 and the fourth liquid cooling tank 1521 face opposite directions. At least one second single cell battery 141 is respectively disposed in the third liquid cooling tank 1511 and the fourth liquid cooling tank 1521, so as to use the third liquid cooling section 151 and the fourth liquid cooling section 152 to dissipate heat from the second single cell battery 141 by liquid cooling, thereby 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.

[0063] Specifically, the fourth liquid cooling section 152 is in contact with the outer surface of the first single cell 121. For example, the fourth liquid cooling section 152 can be in direct contact with the first single cell 121, and thermally conductive structural adhesive can also be filled between the fourth liquid cooling section 152 and the first single cell 121 for indirect contact connection, thereby achieving thermally conductive connection between the fourth liquid cooling section 152 and the first single cell 121.

[0064] The third liquid cooling section 151 and the fourth liquid cooling section 152 can be integrally formed, meaning they are a single, integrated structure. Alternatively, the third liquid cooling section 151 and the fourth liquid cooling section 152 can be separately configured and fixedly connected. For example, the fourth liquid cooling section 152 is fixedly connected to the third liquid cooling section 151 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 third liquid cooling section 151 and the fourth liquid cooling section 152 are integrally die-cast.

[0065] Understandably, this application connects the fourth liquid cooling unit 152 to the first single cell 121 through contact, so that the first liquid cooling component 130 and the fourth liquid cooling unit 152 can simultaneously cool and dissipate heat from the first single cell 121, thereby increasing the actual heat dissipation area of ​​the first single cell 121 and improving the liquid cooling efficiency of the first single cell 121. This further optimizes the overall liquid cooling structure of the battery pack 100, further improves the overall liquid cooling performance of the battery pack 100, helps the battery pack 100 to match higher charging rates, further 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, the second liquid cooling component 150 has the function of auxiliary fixing the first single cell 121, further making the overall structure of the battery pack 100 compact and stable, and improving the overall structural stability of the battery pack 100.

[0066] In some embodiments, refer to Figures 3 to 5Multiple third liquid cooling sections 151 and multiple fourth liquid cooling sections 152 are provided, and the multiple third liquid cooling sections 151 and multiple fourth liquid cooling sections 152 are arranged alternately in the first direction X. At least one second single cell 141 is provided in each third liquid cooling tank 1511 and each fourth liquid cooling tank 1521, and each fourth liquid cooling section 152 is in contact with the outer surface of a corresponding first single cell 121, so as 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 a higher charging rate, 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.

[0067] In some embodiments, the second single cell 141 has a second outer wall surface 1411, which extends along the circumferential direction R, and the third liquid cooling portion 151 and the fourth liquid cooling portion 152 both cover a portion of the second outer wall surface 1411.

[0068] Specifically, the contact area between the third liquid cooling section 151 and the second outer wall surface 1411 is S4 mm. 2 The contact area between the fourth liquid cooling section 152 and the second outer wall surface 1411 is S5 mm. 2 The surface area of ​​the second outer wall surface 1411 is S6 mm. 2 The following conditions must be met: S4 / S6 = 0.5, S4 / S6 = 0.5, to improve the liquid cooling efficiency of the second single cell 141, 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 charging 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.

[0069] The contact area between the third liquid cooling section 151 and the second outer wall surface 1411 is S4 mm. 2 The measurement method, the contact area S5 mm between the fourth liquid cooling part 152 and the second outer wall surface 1411 2 The measurement method, the surface area of ​​the second outer wall 1411 is S6 mm 2 The measurement method is based on the contact area S1 mm between the first liquid cooling part 131 and the first outer wall surface 1211. 2 The measurement method is the same, and will not be elaborated here. Please refer to the description above.

[0070] In some embodiments, refer to Figures 3 to 5The first liquid cooling tank 1311 is connected to the fourth liquid cooling tank 1521 to form a first liquid cooling space. Part of the first single cell 121 and part of the second single cell 141 are disposed in the first liquid cooling space to limit and fix the first single cell 121 and the second single cell 141, further achieving auxiliary fixation of the first single cell 121 and the second single cell 141, further making the overall structure of the battery pack 100 compact and stable, and improving the overall structural stability of the battery pack 100.

[0071] Specifically, the second liquid cooling tank 1321 is connected to the third liquid cooling tank 1511 to form a second liquid cooling space. Part of the first single cell 121 and part of the second single cell 141 are disposed in the second liquid cooling space to limit and fix the first single cell 121 and the second single cell 141, further achieving auxiliary fixation of the first single cell 121 and the second single cell 141, further making the overall structure of the battery pack 100 compact and stable, and improving the overall structural stability of the battery pack 100.

[0072] In some embodiments, a portion of the first liquid cooling section 131 is in contact with the fourth liquid cooling section 152, and a portion of the second liquid cooling section 132 is in contact with the third liquid cooling section 151. That is, the first liquid cooling section 131 and the fourth liquid cooling section 152 are auxiliaryly fixed together, and the second liquid cooling section 132 and the third liquid cooling section 151 are auxiliaryly fixed together. In other words, the first liquid cooling component 130 and the second liquid cooling component 150 are auxiliaryly fixed together, which further improves the overall structural stability of the battery pack 100.

[0073] In some embodiments, multiple sets of the first battery pack 120 and the second battery pack 140 are provided, with the multiple sets of the first battery pack 120 and the multiple sets of the second battery pack 140 arranged alternately in the second direction Y; multiple sets of the first liquid cooling component 130 and the multiple sets of the second liquid cooling component 150 are provided, with the multiple sets of the first liquid cooling component 130 and the multiple sets of the second liquid cooling component 150 arranged alternately in the second direction Y, so as 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.

[0074] In some embodiments, refer to Figure 4 The first liquid cooling component 130 is provided with a first liquid inlet 133 and a first liquid outlet 134, and the second liquid cooling component 150 is provided with a second liquid inlet 153 and a second liquid outlet 154.

[0075] The battery pack 100 also includes a main liquid inlet pipe (not shown in the figure) and a main liquid outlet pipe (not shown in the figure). The main liquid inlet pipe is connected to the first liquid inlet 133 and the second liquid inlet 153, and the main liquid outlet pipe is connected to the first liquid outlet 134 and the second liquid outlet 154.

[0076] The main inlet pipe and the main outlet pipe are both connected to the external liquid storage device of the battery pack 100, which is used to provide coolant.

[0077] Specifically, the coolant in the storage device is delivered to the main inlet pipe. The coolant from the main inlet pipe enters the liquid cooling channel inside the first liquid cooling component 130 through the first inlet 133, and enters the liquid cooling channel inside the second liquid cooling component 150 through the second inlet 153, so as to circulate in the first liquid cooling component 130 and the second liquid cooling component 150 for liquid cooling heat dissipation. The coolant in the first liquid cooling component 130 is discharged to the main outlet pipe through the first outlet 134, and the coolant in the second liquid cooling component 150 is discharged to the main outlet pipe through the second outlet 154. The coolant from the main outlet pipe is discharged to the storage device to form a liquid cooling cycle.

[0078] This application improves the cooling control efficiency of the battery pack 100 by setting a main liquid inlet pipe and a main liquid outlet pipe to achieve synchronous control of multiple first liquid cooling components 130 and second liquid cooling components 150.

[0079] 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.

[0080] 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.

[0081] 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 having a first direction and a second direction that are perpendicular to each other, characterized in that, include: The box body is equipped with a receiving cavity; A first battery pack is disposed in the receiving cavity, and the first battery pack includes a plurality of first individual cells arranged along the first direction; A second battery pack is disposed in the receiving cavity. The second battery pack and the first battery pack are arranged adjacent to each other along the second direction. The second battery pack includes a plurality of second individual cells arranged along the first direction. A first liquid cooling element is disposed within the receiving cavity, covering the outer surface of each of the first individual cells, and a portion of the first liquid cooling element is in contact with and connected to the second individual cells; and A second liquid cooling component is disposed within the receiving cavity. The second liquid cooling component and the first liquid cooling component are arranged along the second direction, and the second liquid cooling component covers the outer surface of each of the second individual cells.

2. The battery pack as described in claim 1, characterized in that, The first liquid cooling component includes: a first liquid cooling section and a second liquid cooling section connected to each other. The first liquid cooling section has a first liquid cooling tank, and the second liquid cooling section has a second liquid cooling tank. The openings of the first liquid cooling tank and the second liquid cooling tank face opposite directions. At least one first single cell is disposed in the first liquid cooling tank and the second liquid cooling tank, respectively. The second liquid cooling section is in contact with the outer surface of the second single cell.

3. The battery pack as described in claim 2, characterized in that, Multiple first liquid cooling units and multiple second liquid cooling units are provided, and the multiple first liquid cooling units and multiple second liquid cooling units are alternately arranged in the first direction; At least one first single cell is disposed in each of the first liquid cooling tanks and each of the second liquid cooling tanks, and each of the second liquid cooling parts is in contact with the outer surface of the corresponding second single cell.

4. The battery pack as described in claim 2, characterized in that, Part of the second liquid cooling component is in contact with the outer surface of the first single cell.

5. The battery pack as described in claim 4, characterized in that, The second liquid cooling component includes a third liquid cooling section and a fourth liquid cooling section connected to each other. The third liquid cooling section has a third liquid cooling tank, and the fourth liquid cooling section has a fourth liquid cooling tank. The openings of the third liquid cooling tank and the fourth liquid cooling tank face opposite directions. At least one second single cell is disposed in each of the third liquid cooling tank and the fourth liquid cooling tank. The fourth liquid cooling section is in contact with the outer surface of the first single cell.

6. The battery pack as described in claim 5, characterized in that, Multiple third liquid cooling units and multiple fourth liquid cooling units are provided, and the multiple third liquid cooling units and multiple fourth liquid cooling units are alternately arranged in the first direction; Each of the third and fourth liquid cooling tanks is provided with at least one second single cell, and each of the fourth liquid cooling sections is in contact with the outer surface of a corresponding first single cell.

7. The battery pack as described in claim 5, characterized in that, The first liquid cooling tank is connected to the fourth liquid cooling tank to form a first liquid cooling space, and / or, The second liquid cooling tank is connected to the third liquid cooling tank to form a second liquid cooling space.

8. The battery pack as described in claim 5, characterized in that, A portion of the first liquid cooling section is in contact with the fourth liquid cooling section, and a portion of the second liquid cooling section is in contact with the third liquid cooling section.

9. The battery pack as claimed in claim 1, characterized in that, The first liquid cooling component is provided with a first liquid inlet and a first liquid outlet, and the second liquid cooling component is provided with a second liquid inlet and a second liquid outlet; The battery pack further includes a main liquid inlet pipe and a main liquid outlet pipe, wherein the main liquid inlet pipe is connected to the first liquid inlet and the second liquid inlet, and the main liquid outlet pipe is connected to the first liquid outlet and the second liquid outlet.

10. An electrical appliance, 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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