Battery pack and electric device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-14
- Publication Date
- 2026-08-11
AI Technical Summary
然而，由于液冷流道需要覆盖的范围较大，液冷流道的延伸路径较长，冷却液沿液冷流道的压降较大，导致温度均匀性较差
[0026]有益效果：本申请实施例的电池包包括液冷件，液冷件具有液冷流道以及连通液冷流道的进液口和出液口，液冷流道包括第一循环流路和第二循环流路，第一循环流路围设于第二循环流路外侧。第一循环流路包括第一流段、多个第二流段和第三流段。第一流段连通进液口，多个第二流段分别连通第一流段，第三流段连通出液口，且多个第二流段分别连通第三流段。第二循环流路包括第四流段、多个第五流段、多个第六流段、多个第七流段和第八流段。第四流段连通进液口，多个第五流段分别连通第四流段，每个第五流段分别连通多个第六流段，每个第七流段分别连通多个第六流段，第八流段连通出液口，且多个第七流段分别连通第八流段。第一循环流路由第一流段进液并由多个并联的第二流段分流，通过第三流段集中至出液口排液，第二循环流路由第四流段进液并由多个并联的第五流段、第六流段和第七流段分流，通过第八流段集中至出液口排液，第一循环流路和第二循环流路均采用多级并联的形式形成多段分流，相较于采用单路串联的形式，在覆盖相同液冷件的换热面积的情况下有利于降低流路长度，减少流体动量损失，从而有利于降低冷却流道的压降并改善液冷件的换热均温性。此外，第一循环流路围设在第二循环流路外侧，当在液冷件布置成组电池时，成组电池的热量大致集中在与第二循环流路对应的区域，相较于第一循环流路，第二循环流路设置的分流流段的数量更多，以增大第二循环流路的覆盖范围并降低流路长度，从而进一步减少流体动量损失并降低流路压降，进一步有利于改善液冷件的换热均温性。
Smart Images
Figure CN224625636U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and electrical equipment. Background Technology
[0002] Currently, liquid-cooled plate heat exchange is one of the mainstream methods for battery pack thermal management. This involves setting up a liquid-cooled channel on the liquid-cooled plate that extends and covers the battery's heat exchange area, ensuring sufficient contact and heat exchange between the coolant and the battery. However, because the liquid-cooled channel needs to cover a large area and has a long extension path, the pressure drop of the coolant along the channel is significant, resulting in poor temperature uniformity. Utility Model Content
[0003] The purpose of this utility model is to provide a battery pack to solve the above-mentioned technical problems; another purpose of this application is to provide an electrical device that uses the above-mentioned battery pack.
[0004] Technical solution: A battery pack according to an embodiment of this application includes:
[0005] A liquid cooling component has a liquid cooling channel and an inlet and an outlet communicating with the liquid cooling channel. The liquid cooling channel includes a first circulation path and a second circulation path, with the first circulation path surrounding the outside of the second circulation path.
[0006] The first loop flow path includes:
[0007] The first flow section is connected to the liquid inlet;
[0008] Multiple second flow segments are connected to the first flow segment respectively;
[0009] The third flow section is connected to the liquid outlet, and the plurality of second flow sections are respectively connected to the third flow section;
[0010] The second circulation path includes:
[0011] The fourth flow section connects to the liquid inlet;
[0012] Multiple fifth flow segments are connected to the fourth flow segment;
[0013] Multiple sixth flow segments, each of the fifth flow segments being connected to the multiple sixth flow segments;
[0014] Multiple seventh flow segments, each of which is connected to multiple sixth flow segments;
[0015] The eighth flow section is connected to the liquid outlet, and the plurality of seventh flow sections are respectively connected to the eighth flow section.
[0016] In some embodiments, the liquid cooling component has a vertical first direction and a vertical second direction;
[0017] The liquid inlet and the liquid outlet are located on the same side of the liquid cooling component in the second direction, and the liquid inlet and the liquid outlet are arranged in the first direction. The first flow segment, the fourth flow segment, the eighth flow segment and the third flow segment are arranged along the first direction, and the second flow segment, the fifth flow segment, the sixth flow segment and the seventh flow segment are bent multiple times in the first direction and the second direction, respectively.
[0018] In some embodiments, the number of bends in the fifth, sixth, and seventh flow segments is greater than the number of bends in the second flow segment.
[0019] In some embodiments, the number of bends in the sixth flow segment is greater than the number of bends in the fifth and seventh flow segments.
[0020] In some embodiments, within the plane defined by the first direction and the second direction, the projected area of the first circulating flow path is smaller than the projected area of the second circulating flow path.
[0021] In some embodiments, the liquid cooling component includes a first plate and a second plate stacked on top of each other. The first plate has a flow channel groove on one side facing the second plate, and the second plate covers the flow channel groove to enclose the liquid cooling flow channel.
[0022] In some embodiments, the first plate includes a first main body and a first extension protruding from one side of the first main body, and the second plate includes a second main body and a second extension protruding from one side of the second main body. The first main body and the second main body are stacked, and the first extension and the second extension are stacked. The liquid inlet and the liquid outlet are disposed on the second extension. The first extension and the second extension are used to extend to the outside of the battery pack so that the liquid inlet and the liquid outlet can be connected to external pipelines.
[0023] In some embodiments, the battery pack further includes a first water nozzle and a second water nozzle, the first water nozzle being detachably connected to the liquid inlet and the second water nozzle being detachably connected to the liquid outlet.
[0024] In some embodiments, the liquid cooling component has a plurality of assembly notches on its outer peripheral side, and the plurality of assembly notches are distributed at intervals around the outer peripheral side of the liquid cooling component.
[0025] Accordingly, the electrical device described in this application includes the aforementioned battery pack.
[0026] Beneficial Effects: The battery pack of this application embodiment includes a liquid cooling component, which has a liquid cooling channel and an inlet and an outlet communicating with the liquid cooling channel. The liquid cooling channel includes a first circulation path and a second circulation path, with the first circulation path surrounding the outside of the second circulation path. The first circulation path includes a first flow segment, a plurality of second flow segments, and a third flow segment. The first flow segment is connected to the inlet, the plurality of second flow segments are respectively connected to the first flow segment, and the third flow segment is connected to the outlet, and the plurality of second flow segments are respectively connected to the third flow segment. The second circulation path includes a fourth flow segment, a plurality of fifth flow segments, a plurality of sixth flow segments, a plurality of seventh flow segments, and an eighth flow segment. The fourth flow segment is connected to the inlet, the plurality of fifth flow segments are respectively connected to the fourth flow segment, each fifth flow segment is respectively connected to the plurality of sixth flow segments, each seventh flow segment is respectively connected to the plurality of sixth flow segments, and the eighth flow segment is connected to the outlet, and the plurality of seventh flow segments are respectively connected to the eighth flow segment. The first circulation path involves liquid inlet in the first flow section and diversion by multiple parallel second flow sections, then concentrating the liquid through the third flow section to the outlet for discharge. The second circulation path involves liquid inlet in the fourth flow section and diversion by multiple parallel fifth, sixth, and seventh flow sections, then concentrating the liquid through the eighth flow section to the outlet for discharge. Both the first and second circulation paths adopt a multi-stage parallel configuration to form multiple flow sections. Compared to a single-path series configuration, this approach helps to reduce the flow path length and fluid momentum loss while covering the same heat exchange area of the liquid cooler. This, in turn, helps to reduce the pressure drop in the cooling channel and improve the heat exchange uniformity of the liquid cooler. In addition, the first circulation flow path surrounds the second circulation flow path. When a group of batteries is arranged in the liquid cooling component, the heat of the group of batteries is roughly concentrated in the area corresponding to the second circulation flow path. Compared with the first circulation flow path, the second circulation flow path has more branch flow sections to increase the coverage of the second circulation flow path and reduce the flow path length, thereby further reducing fluid momentum loss and flow path pressure drop, which is more conducive to improving the heat exchange uniformity of the liquid cooling component. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of the structure of the liquid cooling component according to an embodiment of this application;
[0029] Figure 2 This is an exploded structural diagram of the liquid cooling component according to an embodiment of this application;
[0030] Figure 3 This is a schematic diagram of the liquid cooling channel structure in an embodiment of this application.
[0031] Explanation of reference numerals in the attached figures:
[0032] 1. Liquid cooling component; 10. Liquid cooling channel; 100. First circulation flow path; 1000. First flow section; 1001. Second flow section; 1002. Third flow section; 101. Second circulation flow path; 1010. Fourth flow section; 1011. Fifth flow section; 1012. Sixth flow section; 1013. Seventh flow section; 1014. Eighth flow section; 11. Liquid inlet; 12. Liquid outlet; 13. First plate; 130. Flow channel groove; 131. First main body; 132. First extension; 14. Second plate; 140. Second main body; 141. Second extension; 2. First water nozzle; 20. First fixing component; 3. Second water nozzle; 30. Second fixing component; 4. Assembly notch; 5. Insulating layer; X, First direction; Y, Second direction. Detailed Implementation
[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0034] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," 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 on 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 features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.
[0035] Currently, the most common heat dissipation method for battery packs is liquid cooling, which involves placing a liquid cooling plate on the battery pack for heat exchange between the batteries. The liquid cooling plate requires a circulating supply of coolant, necessitating the installation of pipes within the battery pack for coolant circulation. In the event of shocks, collisions, or other impacts on the battery pack, these pipes pose a risk of leakage, potentially causing short circuits and ultimately thermal runaway.
[0036] Meanwhile, the circulation path of the coolant inside the liquid cooling plate is usually set as an extended liquid cooling channel that covers the heat exchange area of the battery to ensure that the coolant can fully contact the battery for heat exchange. However, because the liquid cooling channel needs to cover a large area and has a long extension path, the pressure drop of the coolant along the liquid cooling channel is large, resulting in poor temperature uniformity.
[0037] In view of this, refer to Figures 1 to 3 This application discloses a battery pack and an electrical device, which aims to solve at least one of the above-mentioned technical problems.
[0038] Reference Figures 1 to 3 The battery pack includes a liquid cooler 1, which has a liquid cooling channel 10 and an inlet 11 and an outlet 12 communicating with the liquid cooling channel 10. The liquid cooling channel 10 includes a first circulation path 100 and a second circulation path 101, with the first circulation path 100 surrounding the outside of the second circulation path 101. It should be noted that in the following embodiments of this application, a first direction X and a second direction Y that are perpendicular to each other are introduced. The plane defined by the first direction X and the second direction Y is approximately parallel to the plane of the liquid cooler 1 used for heat exchange with the battery.
[0039] The first circulation path 100 includes a first flow section 1000, multiple second flow sections 1001, and a third flow section 1002. The first flow section 1000 is connected to the liquid inlet 11, the multiple second flow sections 1001 are respectively connected to the first flow section 1000, the third flow section 1002 is connected to the liquid outlet 12, and the multiple second flow sections 1001 are respectively connected to the third flow section 1002.
[0040] The second circulation path 101 includes a fourth flow section 1010, multiple fifth flow sections 1011, multiple sixth flow sections 1012, multiple seventh flow sections 1013, and an eighth flow section 1014. The fourth flow section 1010 is connected to the inlet 11, the multiple fifth flow sections 1011 are each connected to the fourth flow section 1010, each fifth flow section 1011 is each connected to the multiple sixth flow sections 1012, each seventh flow section 1013 is each connected to the multiple sixth flow sections 1012, and the eighth flow section 1014 is connected to the outlet 12, and the multiple seventh flow sections 1013 are each connected to the eighth flow section 1014.
[0041] The first circulation path 100 receives liquid from the first flow section 1000 and is divided by multiple parallel second flow sections 1001, then concentrates the liquid through the third flow section 1002 to the outlet 12 for discharge. The second circulation path 101 receives liquid from the fourth flow section 1010 and is divided by multiple parallel fifth flow sections 1011, multiple parallel sixth flow sections 1012 and multiple parallel seventh flow sections 1013, then concentrates the liquid through the eighth flow section 1014 to the outlet 12 for discharge. Both the first circulation path 100 and the second circulation path 101 adopt a multi-stage parallel configuration to form a multi-segment flow distribution. Compared with a single-path series configuration, this approach helps to reduce the flow path length and fluid momentum loss while covering the same heat exchange area of the liquid cooler 1, thereby reducing the pressure drop of the cooling channel 10 and improving the heat exchange uniformity of the liquid cooler 1. The first circulation path 100 surrounds the second circulation path 101. When a group of batteries is arranged in the liquid cooler 1, the heat of the group of batteries is roughly concentrated in the area corresponding to the second circulation path 101. Compared with the first circulation path 100, the second circulation path 101 has more branch flow sections to increase the coverage of the second circulation path 101 and reduce the flow path length, thereby further reducing fluid momentum loss and flow path pressure drop, which is more conducive to improving the heat exchange uniformity of the liquid cooler 1.
[0042] In some embodiments, refer to Figures 1 to 3 The liquid cooling component 1 includes a first plate 13 and a second plate 14 stacked together. The first plate 13 has a flow channel groove 130 on the side facing the second plate 14, and the second plate 14 covers the flow channel groove 130 to enclose the liquid cooling flow channel 10. It is understood that the first plate 13 and the second plate 14 can be manufactured by processes such as stamping, and the aforementioned flow channel groove 130 is formed during the forming process. The stacked first plate 13 and the second plate 14 enclose the aforementioned liquid cooling flow channel 10, integrating the liquid cooling flow channel 10 onto the first plate 13 and the second plate 14. This helps to reduce the number of pipes required for the circulation of coolant inside and outside the battery pack, and reduces the risk of coolant leakage when the battery pack is subjected to collisions, vibrations, or other events.
[0043] In some embodiments, refer to Figures 1 to 3The first plate 13 includes a first main body 131 and a first extension 132 protruding from one side of the first main body 131 in the second direction Y. The second plate 14 includes a second main body 140 and a second extension 141 protruding from one side of the second main body 140 in the second direction Y. The first main body 131 and the second main body 140 are stacked, and the first extension 132 and the second extension 141 are also stacked. An inlet 11 and an outlet 12 are located on the second extension 141. The first extension 132 and the second extension 141 extend to the outside of the battery pack to allow external piping for the inlet 11 and the outlet 12. The first extension 132 and the second extension 141 are stacked and extend to the outside of the battery pack, thus placing the inlet 11 and the outlet 12 outside the battery pack. This eliminates the need for piping for circulating coolant within the battery pack, thereby avoiding the risk of pipe aging, damage, and coolant leakage within the battery pack. Meanwhile, the external liquid inlet 11 and liquid outlet 12 help save internal space in the battery pack, which in turn helps to improve the energy density of the battery pack.
[0044] Furthermore, in some embodiments, reference is made to Figure 1 and Figure 2 The liquid cooling component 1 also includes a first water nozzle 2 and a second water nozzle 3. The first water nozzle 2 is detachably connected to the liquid inlet 11, and the second water nozzle 3 is detachably connected to the liquid outlet 12. The second extension 141 is fixed to the liquid inlet 11 with a first fixing member 20, and to the liquid outlet 12 with a second fixing member 30. The first water nozzle 2 is sealed to the first fixing member 20 and connected to the liquid inlet 11, and the second water nozzle 3 is sealed to the second fixing member 30 and connected to the liquid outlet 12. It should be noted that the first fixing member 20 and the second fixing member 30 can both be connected to the second extension 141 by welding. The first water nozzle 2 and the first fixing member 20 can be connected by threaded connection and sealing ring auxiliary sealing to form a detachable sealed connection. Similarly, the second water nozzle 3 and the second fixing member 30 can also be connected by threaded connection and sealing ring auxiliary sealing to form a detachable sealed connection. These detachable sealed connection methods are existing technology and will not be described further here. To further improve the installation stability of the first water nozzle 2 and the second water nozzle 3, bolts can also be used to assist in connecting the first plate 13 and the second plate 14, which will not be elaborated here.
[0045] In some embodiments, refer to Figure 2 and Figure 3 The inlet 11 and outlet 12 are arranged in the first direction X. The first flow segment 1000, the fourth flow segment 1010, the eighth flow segment 1014, and the third flow segment 1002 are arranged in the first direction X, and the second flow segment 1001, the fifth flow segment 1011, the sixth flow segment 1012, and the seventh flow segment 1013 are bent multiple times in the first direction X and the second direction Y, respectively. For example, Figure 3As shown, the overall first circulation flow path 100 is arranged outside the second circulation flow path 101. The first flow segment 1000, the third flow segment 1002, and multiple parallel second flow segments 1001 are arranged outside the fourth flow segment 1010, the fifth flow segment 1011, the sixth flow segment 1012, the seventh flow segment 1013, and the eighth flow segment 1014. In this embodiment, the liquid inlet 11 and the liquid outlet 12 are concentrated on the same side of the overall liquid cooler 1 in the second direction Y, and are located in the middle position, which facilitates the centralized external piping. The flow areas of each flow segment of the overall first circulation flow path 100 and the second circulation flow path 101 are approximately the same. In other embodiments, the flow areas of each flow segment can be flexibly adjusted as needed, which will not be elaborated here. The second flow segment 1001, the fifth flow segment 1011, the sixth flow segment 1012, and the seventh flow segment 1013 are all set in the form of multiple parallel segments to increase the coverage of the effective heat exchange surface of the liquid cooler 1. In order to be located outside the fifth section 1011, the sixth section 1012, and the seventh section 1013, the second flow section 1001 needs to be bent multiple times in the first direction X and the second direction Y. Similarly, the fifth section 1011, the sixth section 1012, and the seventh section 1013 also adopt the form of multiple bends in the first direction X and the second direction Y to increase the coverage of the effective heat exchange surface of the liquid cooler 1, so that the fifth section 1011, the sixth section 1012, and the seventh section 1013 can fully exert the effect of flow diversion and temperature equalization.
[0046] In some embodiments, refer to Figure 3 Within the plane defined by the first direction X and the second direction Y, the projected area of the first circulation flow path 100 is smaller than the projected area of the second circulation flow path 101. It is understood that the projected areas of the first circulation flow path 100 and the second circulation flow path 101 can be calculated by projecting the channel wall of the flow channel 130. When the overall liquid cooling component 1 contacts and exchanges heat with the battery pack, the heat is concentrated at the corresponding position of the second circulation flow path 101. Appropriately increasing the coverage area of the second circulation flow path 101 is beneficial to improving the temperature uniformity for heat dissipation of the battery located in the middle region.
[0047] Furthermore, in some embodiments, reference is made to... Figure 3The number of bends in the fifth flow section 1011, the sixth flow section 1012, and the seventh flow section 1013 is greater than the number of bends in the second flow section 1001. It should be noted that, given that the first plate 13 and the second plate 14 are manufactured using a stamping process, it is understandable that the forces at the edges of the first plate 13 and the second plate 14 are greater than those at the middle. Due to uneven stress distribution, the middle of the first plate 13 and the second plate 14 is prone to yielding and arching. Increasing the number of bends in the fifth flow section 1011, the sixth flow section 1012, and the seventh flow section 1013 helps to increase the transverse and longitudinal extensions of the overall second circulation flow path 101 in the first direction X and the second direction Y. This helps to counteract stress during the forming process of the first plate 13, thereby reducing the local springback of the first plate 13 during stamping and improving the flatness of the overall liquid-cooled part 1. In addition, increasing the transverse and longitudinal extension structure in the middle of the first plate 13 is also beneficial to improving the yield resistance of the first plate 13, thereby improving the molding stability of the first plate 13.
[0048] In some embodiments, refer to Figure 3 The number of bends in the sixth flow section 1012 is greater than that in the fifth flow section 1011 and the seventh flow section 1013. It is understood that, in this embodiment, the exemplary sixth flow section 1012 is located in the central region of the overall liquid cooling component 1 in the second circulation flow path 101. Further increasing the number of bends in the sixth flow section 1012 in this region is beneficial to further improve the stress relief effect and the flatness of the first plate 13.
[0049] Furthermore, in some embodiments, reference is made to Figure 1 and Figure 2 The liquid cooling component 1 also includes an insulating layer 5. In this embodiment, the side of the second plate 14 facing away from the first plate 13 is used as the heat exchange surface for contacting the battery for heat exchange. The insulating layer 5 is stacked on the side of the second plate 14 facing away from the first plate 13, which helps to form insulation protection for the battery. The insulating layer 5 can be integrally injection molded, and the insulating layer 5 can be made of a thermally conductive and insulating material. The material principle is existing technology and will not be described in detail here. While improving the insulation effect, the insulating layer 5 can also help improve the flatness of the surface in contact with the battery, increase the effective contact area with the battery, and thus improve the heat exchange effect.
[0050] In some embodiments, refer to Figures 1 to 3 The liquid cooling component 1 has multiple assembly notches 4 on its outer periphery, which are spaced apart around the outer periphery of the liquid cooling component 1. Specifically, the first plate 13 and the second plate 14 both have the aforementioned assembly notches 4 on their outer periphery, and the assembly notches 4 on the first plate 13 and the second plate 14 correspond one-to-one. The assembly notches 4 penetrate the outer side of the liquid cooling component 1, which, compared to using a through hole, helps to reduce the overall assembly precision of the liquid cooling component 1 and reduces the assembly difficulty of the liquid cooling component 1.
[0051] Accordingly, this application provides an electrical device that includes the aforementioned battery pack. This electrical device can be an electronic device, a storage device, or a vehicle, etc. It is understood that this electrical device can possess all the technical features and corresponding beneficial effects of the aforementioned battery pack, which will not be elaborated further here.
[0052] The battery pack and electrical device provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A battery pack, characterized in that, include: A liquid cooling component has a liquid cooling channel and an inlet and an outlet communicating with the liquid cooling channel. The liquid cooling channel includes a first circulation path and a second circulation path, with the first circulation path surrounding the outside of the second circulation path. The first loop flow path includes: The first flow section is connected to the liquid inlet; Multiple second flow segments are connected to the first flow segment respectively; The third flow section is connected to the liquid outlet, and the plurality of second flow sections are respectively connected to the third flow section; The second circulation path includes: The fourth flow section connects to the liquid inlet; Multiple fifth flow segments are connected to the fourth flow segment; Multiple sixth flow segments, each of the fifth flow segments being connected to the multiple sixth flow segments; Multiple seventh flow segments, each of which is connected to multiple sixth flow segments; The eighth flow section is connected to the liquid outlet, and the plurality of seventh flow sections are respectively connected to the eighth flow section.
2. The battery pack according to claim 1, characterized in that, The liquid-cooled component has a vertical first direction and a vertical second direction; The liquid inlet and the liquid outlet are located on the same side of the liquid cooling component in the second direction, and the liquid inlet and the liquid outlet are arranged in the first direction. The first flow segment, the fourth flow segment, the eighth flow segment and the third flow segment are arranged along the first direction, and the second flow segment, the fifth flow segment, the sixth flow segment and the seventh flow segment are bent multiple times in the first direction and the second direction, respectively.
3. The battery pack according to claim 2, characterized in that, The number of bends in the fifth, sixth, and seventh flow sections is greater than the number of bends in the second flow section.
4. The battery pack according to claim 3, characterized in that, The sixth flow segment has a greater number of bends than the fifth and seventh flow segments.
5. The battery pack according to claim 2, characterized in that, Within the plane defined by the first direction and the second direction, the projected area of the first circulating flow path is smaller than the projected area of the second circulating flow path.
6. The battery pack according to any one of claims 1 to 5, characterized in that, The liquid cooling component includes a first plate and a second plate stacked on top of each other. The first plate has a flow channel groove on the side facing the second plate, and the second plate covers the flow channel groove to enclose the liquid cooling flow channel.
7. The battery pack according to claim 6, characterized in that, The first plate includes a first main body and a first extension protruding from one side of the first main body. The second plate includes a second main body and a second extension protruding from one side of the second main body. The first main body and the second main body are stacked on top of each other, and the first extension and the second extension are stacked on top of each other. The liquid inlet and the liquid outlet are located on the second extension. The first extension and the second extension are used to extend to the outside of the battery pack so that the liquid inlet and the liquid outlet can be connected to external pipelines.
8. The battery pack according to claim 7, characterized in that, The battery pack also includes a first water nozzle and a second water nozzle, the first water nozzle being detachably connected to the liquid inlet and the second water nozzle being detachably connected to the liquid outlet.
9. The battery pack according to claim 1, characterized in that, The liquid cooling component has multiple assembly notches on its outer periphery, and these assembly notches are spaced apart around the outer periphery of the liquid cooling component.
10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.