Liquid collecting component, battery pack and electric device

Abstract

The utility model relates to a liquid collecting component and a battery pack. The liquid collecting component comprises a main pipe and a plurality of branch pipes, the shielding pieces can shield the flow channels of the branch pipes so as to reduce the overflowing area, and the shielding area of each shielding piece can be determined according to the flow needed by the corresponding branch pipe. Due to the fact that the fluid pressure at the position, close to the liquid inlet, of the main pipe is large, and the fluid pressure at the position, away from the liquid inlet, of the main pipe is small, the area of the shielding piece in the branch pipe close to the liquid inlet is large, and the area of the shielding piece in the branch pipe away from the liquid inlet is small or no shielding piece is arranged. Therefore, the flow in each branch pipe can be controlled, so that the flow in each branch pipe tends to be consistent. Therefore, the flow rates of the cooling liquid flowing into the plurality of cooling plates from the plurality of branch pipes are roughly the same, so that the plurality of cooling plates can realize uniform heat dissipation on each area in the battery pack, and the uniformity of the temperature in the battery is remarkably improved. In addition, the utility model also provides an electric device.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and particularly relates to a liquid collecting component, a battery pack and an electric device. Background Art

[0002] At present, power batteries generally adopt a liquid cooling method for cooling. The coolant can flow through the liquid cooling plate arranged inside the battery, thereby taking away the heat inside the battery. For the parallel connection scheme of large-area liquid cooling plates, a plurality of liquid cooling plates are sequentially communicated with a liquid collecting pipe. The coolant can first enter the liquid collecting pipe and then flow into a plurality of liquid cooling plates through the liquid collecting pipe in sequence. Usually, the flow rate in the liquid cooling plate close to the inlet of the liquid collecting pipe is large, while the flow rate in the liquid cooling plate far from the inlet is small. There is a large difference in the flow rates in a plurality of liquid cooling plates, resulting in a large difference in the heat exchange efficiency of different liquid cooling plates. Thus, it will lead to a difference in the temperature of different regions inside the power battery, and the temperature uniformity is poor. Summary of the Utility Model

[0003] Based on this, it is necessary to provide a liquid collecting component, a battery pack and an electric device that can improve the temperature uniformity inside the battery for the above problems.

[0004] On the one hand, the present application provides a liquid collecting component, including a main pipe and a plurality of branch pipes spaced along the extension direction of the main pipe and communicated with the main pipe. An inlet is arranged on the main pipe. The plurality of branch pipes are used to be respectively connected to the joints of a plurality of cooling plates. And at least part of the inside of the branch pipes is provided with a shielding member. The shielding member can reduce the flow area of the branch pipe where it is located, so that along the direction of the extension of the main pipe and away from the inlet, the flow areas of the plurality of branch pipes gradually increase.

[0005] In one embodiment, the main pipe includes a plurality of flexible connection sections spaced along the extension direction of the main pipe, and a flexible connection section is arranged between adjacent two branch pipes.

[0006] In one embodiment, the flexible connection section is arranged as a corrugated pipe section.

[0007] In one embodiment, each branch pipe includes an outer sleeve pipe and a flexible inner lining pipe nested with each other. The branch pipe is sleeved on the joint to be connected to the joint, and the flexible inner lining pipe is clamped between the outer wall of the joint and the outer sleeve pipe.

[0008] In one embodiment, the branch pipe is a single-layer structure; a sealing ring is embedded in the inner wall of each branch pipe. The branch pipe is sleeved on the joint to be connected to the joint, and the sealing ring is clamped between the outer wall of the joint and the inner wall of the branch pipe;

[0009] Alternatively, a sealing ring is sleeved on the outer wall of each of the branch pipes. The branch pipes penetrate through the joint to be connected to the joint, and the sealing ring is clamped between the inner wall of the joint and the outer wall of the branch pipe.

[0010] In one embodiment, each of the branch pipes is provided with a claw, and when the branch pipe is connected to the joint, the claw is clamped with the reverse teeth on the cooling plate.

[0011] In one embodiment, the claw includes an elastic arm and a clamping head arranged at the end of the elastic arm. When the branch pipe is connected to the joint, the elastic arm is elastically deformed in a direction away from the branch pipe under the extrusion of the cooling plate, and an elastic force is generated to make the clamping head snap into the reverse teeth.

[0012] In one embodiment, the shielding member is arranged as a fan-shaped or annular baffle.

[0013] On the other hand, the present application provides a battery pack, including a plurality of cooling plates, a battery cell module, and a liquid collecting member as described in any one of the above preferred embodiments. The joints of the plurality of cooling plates are respectively connected to the plurality of branch pipes, and the plurality of cooling plates all extend into the battery cell module.

[0014] In addition, the present application further provides an electrical device, including the battery pack as described in the above preferred embodiment.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] For the above liquid collecting member and battery pack, the shielding member can shield the flow channel of the corresponding branch pipe to reduce the flow area, and the shielding area of each shielding member can be determined according to the required flow rate of the corresponding branch pipe. Since the fluid pressure is high at the position of the main pipe close to the liquid inlet and low at the position far from the liquid inlet, the area of the shielding member in the branch pipe close to the liquid inlet is set larger, while the area of the shielding member in the branch pipe far from the liquid inlet is set smaller or no shielding member is provided. In this way, the flow rate in each branch pipe can be controlled, so that the flow rates in the branch pipes tend to be consistent. Therefore, the coolant flow rates flowing into the plurality of cooling plates from the plurality of branch pipes are also substantially the same, so that the plurality of cooling plates can uniformly dissipate heat from each area inside the battery pack, thereby significantly improving the uniformity of the internal temperature of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of a partial structure of a battery pack in an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of a partial structure of a battery pack in another embodiment of the present invention;

[0020] Figure 3 It is a schematic diagram of the structure of a current collector member in an embodiment of the present invention;

[0021] Figure 4 For Figure 3 The front view of the current collector member shown;

[0022] Figure 5 It is a schematic diagram of the structure of a current collector member in another embodiment of the present invention. Detailed implementation manners

[0023] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific implementation manners of the present invention with reference to the drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0025] In addition, 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0026] In the present utility model, unless otherwise clearly defined and limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0028] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0029] The present utility model discloses an electric device and a battery pack. The above-mentioned electric device includes the above-mentioned battery pack and can be powered by the above-mentioned battery pack. Among them, the above-mentioned electric device can be a vehicle, a spacecraft, an electric toy, an electric tool, an energy storage device, a amusement device, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy or an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator and a planer, etc.; the energy storage device can be an energy storage wall, a base station energy storage, a container energy storage, etc.; the amusement device can be a carousel, a drop tower, etc. This application does not impose special restrictions on the above-mentioned electric device.

[0030] For a new energy vehicle, the above-mentioned battery pack can be used as a driving power source to replace fossil fuels to provide driving power.

[0031] Please refer to Figure 1 , Figure 2 and Figure 3 , the battery pack 10 in the preferred embodiment of the present utility model includes a liquid collecting member 100, a cooling plate 200 and a battery cell module 300.

[0032] The liquid collecting member 100 includes a main pipe 110 and a plurality of branch pipes 120. The plurality of branch pipes 120 are arranged at intervals along the extending direction of the main pipe 110 and communicate with the main pipe 110. The main pipe 110 has a liquid inlet (not shown in the figure). The liquid inlet can be arranged at one end of the main pipe 110 or in the middle of the main pipe 110. The coolant can enter the main pipe 110 through the liquid inlet and flow into the plurality of branch pipes 120 in turn during the process of being conveyed along the main pipe 110.

[0033] In order to reduce the risk of coolant leakage, specifically in this embodiment, the main pipe 110 and the plurality of branch pipes 120 are of an integrally formed structure. The main pipe 110 and the plurality of branch pipes 120 can be formed by integral injection molding using a plastic material. Therefore, there is no assembly gap between the main pipe 110 and the plurality of branch pipes 120, so as to effectively avoid leakage at the connection between the main pipe 110 and the branch pipes 120.

[0034] A plurality of cooling plates 200 are provided, and each cooling plate 200 is provided with a connector 210, and the connector 210 communicates with the flow channel in the cooling plate 200. Among them, the plurality of branch pipes 120 of the liquid collecting member 100 are respectively connected to the connectors 210 of the plurality of cooling plates 200, that is, the plurality of cooling plates 200 are connected in parallel through the liquid collecting member 100. Therefore, the coolant flowing through the main pipe 110 can be distributed into the corresponding cooling plates 200 through the plurality of branch pipes 120. It should be noted that each cooling plate 200 can be provided with two or more connectors 210. At this time, it is necessary to match the same number of liquid collecting members 100.

[0035] For example, Figure 1 and Figure 2 each cooling plate 200 shown is provided with two connectors 210, so two liquid collecting members 100 need to be configured. Moreover, each liquid collecting member 100 is connected to one of the connectors 210 of each cooling plate 200 through the corresponding branch pipe 120.

[0036] The branch pipe 120 and the connector 210 can be connected in an interpolation or extrapolation manner. Interpolation means that the branch pipe 120 penetrates into the connector 210, for example Figure 2 ; and extrapolation means that the connector 210 penetrates into the branch pipe 120, for example Figure 1 .

[0037] Please refer to again Figure 3 , in an embodiment, the branch pipe 120 and the connector 210 are connected in an extrapolation manner, and each branch pipe 120 includes an outer sleeve 121 and a flexible inner lining pipe 122 nested with each other, and the flexible inner lining pipe 122 is clamped between the outer wall of the connector 210 and the outer sleeve 121.

[0038] The outer sleeve 121 is generally formed of a plastic material with higher hardness and is not easily deformed. The flexible inner lining pipe 122 can be formed of materials such as rubber and silica gel that can undergo elastic deformation. When the branch pipe 120 is inserted into the connector 210, the connector 210 can squeeze the flexible inner lining pipe 122 and deform it, so that the flexible inner lining pipe 122 plays a sealing role between the connector 210 and the branch pipe 120. The main pipe 110 can be set as a single-layer structure or a double-layer structure same as the branch pipe 120.

[0039] Please refer to together Figure 5 , in another embodiment, the branch pipe 120 and the connector 210 are also connected in an extrapolation manner, but the branch pipe 120 is a single-layer structure. At this time, a sealing ring 123 is embedded in the inner wall of each branch pipe 120, and the sealing ring 123 is clamped between the outer wall of the connector 210 and the inner wall of the branch pipe 120, and can play a sealing role between the connector 210 and the branch pipe 120.

[0040] In addition, in other embodiments, the branch pipe 120 has a single-layer structure, and the branch pipe 120 and the joint 210 are connected by an interpolation method (as Figure 2 shown). At this time, a sealing ring 123 is sleeved on the outer wall of each branch pipe 120, and the sealing ring 123 is clamped between the inner wall of the joint 210 and the outer wall of the branch pipe 120. Similarly, the sealing ring 123 can play a sealing role between the joint 210 and the branch pipe 120.

[0041] Obviously, the branch pipe 120 and the joint 210 can be connected in many other ways, which are not limited here, as long as it is ensured that the coolant can flow into the joint 210 through the branch pipe 120.

[0042] Multiple cooling plates 200 all extend into the battery cell module 300. Specifically, the battery cell module 300 includes multiple battery cells (not labeled in the figure), and the multiple battery cells can be electrically connected in series, in parallel, or in a combination of series and parallel. The battery cells can be lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and their outer contours can be cylindrical, flat, cuboid, or other shapes, but are not limited thereto. Specifically in this embodiment, the above-mentioned battery cells are lithium-ion square shell batteries.

[0043] The cooling plate 200 extending into the battery cell module 300 is in contact with the adjacent battery cell, and heat exchange can occur between the two. Therefore, as the coolant flows in the cooling plate 200, the heat inside the battery cell module 300 can be quickly taken away through the cooling plate 200, so as to achieve the purpose of cooling the battery pack 10. In order to improve the heat exchange efficiency between the battery cell and the cooling plate 200, the large surface of the battery cell in the battery cell module 300 is attached to the adjacent cooling plate 200. The large surface of the battery cell refers to the side with the largest area. Taking the square shell battery as an example, its large surface refers to the front and rear two sides.

[0044] Please refer to Figure 4 together. A shielding member 130 is provided inside at least part of the branch pipes 120. The shielding member 130 can reduce the flow area of the branch pipe 120 where it is located, so that in the direction along the main pipe 110 and away from the liquid inlet, the flow areas of the multiple branch pipes 120 gradually increase.

[0045] The areas of the shielding members 130 in different branch pipes 120 are different, so that the flow areas of different branch pipes 120 are different. Specifically, for the case where the liquid inlet is located at one end of the main pipe 110, in the direction from the end with the liquid inlet to the other end, the flow areas of the multiple branch pipes 120 gradually increase. For example, Figure 4The liquid inlet of the current collector member 100 shown is opened at the left end of the main pipe 110. Then, from left to right, the area of the blocking member 120 in the three branch pipes 120 gradually decreases, while the flow-through area of the three branch pipes 120 gradually increases from left to right. For the case where the liquid inlet is located in the middle of the main pipe 110, in the direction from the position where the liquid inlet is located to both ends, the flow-through areas of the multiple branch pipes 120 gradually increase.

[0046] The flow rate of the coolant in the cooling plate 200 is positively correlated with the flow-through area of the connected branch pipe 120 and the fluid pressure. Since the fluid pressure is high at the position of the main pipe 110 close to the liquid inlet and low at the position far from the liquid inlet. Therefore, if the flow-through areas of the multiple branch pipes 120 are the same, the flow rate of the coolant in the cooling plate 200 connected to the branch pipe 120 close to the liquid inlet is larger, while the flow rate of the coolant in the cooling plate 200 connected to the branch pipe 120 far from the liquid inlet is smaller. In this way, there will be a large difference in the flow rate of the coolant in the multiple cooling plates 200, which will further lead to uneven cooling.

[0047] To avoid this situation, the area of the blocking member 130 in the branch pipe 120 close to the liquid inlet is set to be larger in the above-mentioned current collector member 100, while the area of the blocking member 130 in the branch pipe 120 far from the liquid inlet is set to be smaller. For the branch pipe 120 farthest from the liquid inlet, the blocking member 130 may not even be provided inside it, so that the flow-through areas of the multiple branch pipes 120 gradually increase in the direction away from the liquid inlet. The blocking area of each blocking member 130 can be determined according to the required flow rate of the branch pipe 120 where it is located. Specifically, the area of each blocking member 130 can be set according to the simulation results to achieve the purpose of making the flow rates in the respective branch pipes 120 tend to be consistent.

[0048] Since the flow rate in each branch pipe 120 can be controlled by setting the blocking member 130, the flow rates in the respective branch pipes 120 tend to be consistent. Therefore, the flow rates of the coolant flowing into the multiple cooling plates 200 from the multiple branch pipes 120 are also approximately the same. Thus, the multiple cooling plates 200 can uniformly dissipate heat from each area inside the battery pack 10, thereby significantly improving the uniformity of the internal temperature of the battery.

[0049] Specifically, in this embodiment, the blocking member 130 is set as a fan-shaped or annular baffle. The cross-section of the branch pipe 120 is generally circular. The edge of the fan-shaped or annular baffle is circular arc-shaped, which can fit well with the inner wall of the branch pipe 120, thus facilitating installation. Further, the area of the fan-shaped baffle can be obtained according to the radius and the central angle, while the area of the annular baffle can be obtained according to the radii of the inner and outer circles. Therefore, setting the blocking member 130 as a fan-shaped or annular baffle can also facilitate setting the blocking area of each blocking member 130.

[0050] In addition, in this embodiment, the diameters of the multiple branch pipes 120 are the same. Specifically, when the branch pipe 120 is connected to the joint 210 by means of external insertion, the diameter of the branch pipe 120 specifically refers to the inner diameter; while when the branch pipe 120 is connected to the joint 210 by means of internal insertion, the diameter of the branch pipe 120 specifically refers to the outer diameter.

[0051] That is to say, regardless of the connection method between the branch pipe 120 and the joint 210, the diameters of the joints 210 on the multiple cooling plates 200 for parallel connection can be kept consistent. That is, on the premise of ensuring uniform heat dissipation in each area inside the battery pack 10, the multiple cooling plates 200 can adopt the same model, so there is no need to distinguish the installation order of each cooling plate 200 during assembly, thereby reducing the assembly difficulty.

[0052] Please refer to again Figure 3 and Figure 5 , in this embodiment, the main pipe 110 includes multiple flexible connection sections 111 arranged at intervals along the extension direction of the main pipe 110, and a flexible connection section 111 is arranged between adjacent two branch pipes 120.

[0053] The flexible connection section 111 can play a buffering role, thereby preventing the pipeline from breaking due to vibration. Moreover, by arranging the flexible connection section 111, the relative positions between the multiple branch pipes 120 can be adjusted. Therefore, even if there are tolerances in the positions of the branch pipes 120 or the joints 210 during the assembly process, the installation tolerances can be compensated by adjusting the relative positions of the branch pipes 120.

[0054] Furthermore, specifically in this embodiment, the flexible connection section 111 is set as a corrugated pipe section. The corrugated pipe section can adopt the same material as the main body part of the main pipe 110 and be formed simultaneously with the main body part, so the processing is more convenient. In addition, the corrugated pipe section can not only expand and contract axially but also deflect laterally, so the buffering effect is better and it is more flexible when used to compensate for tolerances.

[0055] It should be noted that in other embodiments, the flexible connection section 111 can also be obtained by replacing a part of the main pipe 110 with flexible material.

[0056] In addition, please refer to again Figure 1 and Figure 3 , in this embodiment, a clamping claw 140 is arranged on each branch pipe 120, and an inverted tooth 220 is arranged on each cooling plate 200. When the branch pipe 120 is connected to the joint 210, the clamping claw 140 is clamped with the inverted tooth 220.

[0057] The claw 140 cooperates with the reverse teeth 220, enabling a detachable connection between the branch pipe 120 and the cooling plate 200, thereby improving the installation convenience. At the same time, the cooperation between the claw 140 and the reverse teeth 220 can also position the branch pipe 120, ensuring that the installation positions of multiple branch pipes 120 relative to the cooling plate 200 are consistent, which helps to further improve the uniformity of the coolant flow rate in multiple cooling plates 200.

[0058] Furthermore, in this embodiment, the claw 140 includes an elastic arm 141 and a clamping joint 142 provided at the end of the elastic arm 141. When the branch pipe 120 is connected to the joint 210, the elastic arm 141 is elastically deformed in a direction away from the branch pipe 120 under the extrusion of the cooling plate 200, generating an elastic force that causes the clamping joint 142 to snap into the reverse teeth 220.

[0059] The elastic arm 141 can extend substantially along the branch pipe 120 and incline inward relative to the branch pipe 120. When the branch pipe 120 is inserted into the joint 210, the elastic arm 141 expands outward under the reaction force of the cooling plate 200, thereby generating a reverse elastic force. This elastic force can enable the clamping joint 142 to smoothly snap into the reverse teeth 220 and effectively prevent the two from disengaging.

[0060] For the above-mentioned liquid collecting member 100 and the battery pack 10, the shielding member 130 can shield the flow channel of the corresponding branch pipe 120, thereby reducing the flow area. The shielding area of each shielding member 130 can be determined according to the required flow rate of the corresponding branch pipe 120. Since the fluid pressure is high at the position of the main pipe 110 close to the liquid inlet and low at the position far from the liquid inlet, the area of the shielding member 130 in the branch pipe 120 close to the liquid inlet is set larger, while the area of the shielding member 130 in the branch pipe 120 far from the liquid inlet is set smaller or no shielding member 130 is provided. In this way, the flow rate in each branch pipe 120 can be controlled, making the flow rates in each branch pipe 120 tend to be consistent. Therefore, the coolant flow rates flowing into multiple cooling plates 200 from multiple branch pipes 120 are also approximately the same, so that multiple cooling plates 200 can uniformly dissipate heat from each area inside the battery pack 10, thereby significantly improving the uniformity of the internal temperature of the battery.

[0061] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0062] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A liquid collecting member (100), characterized in that: The invention comprises a main pipe (110) and a plurality of branch pipes (120) arranged at intervals along the extension direction of the main pipe (110) and connected to the main pipe (110); the main pipe (110) is provided with a liquid inlet; the plurality of branch pipes (120) are used to be respectively connected to joints (210) of a plurality of cooling plates (200); and at least a portion of the branch pipes (120) are provided with shielding members (130) inside, wherein the shielding members (130) can reduce the flow area of ​​the branch pipes (120) so that the flow area of ​​the plurality of branch pipes (120) gradually increases in a direction extending along the main pipe (110) and away from the liquid inlet.

2. The liquid collecting member (100) according to claim 1, characterized in that: The main pipe (110) comprises a plurality of flexible connection sections (111) arranged at intervals along the extension direction of the main pipe (110), and the flexible connection section (111) is arranged between two adjacent branch pipes (120).

3. The liquid collecting member (100) according to claim 2, characterized in that: The flexible connecting section (111) is configured as a bellows section.

4. The liquid collecting member (100) according to claim 1, characterized in that: Each of the branch pipes (120) includes an outer sleeve (121) and a flexible inner lining pipe (122) which are nested with each other. The branch pipe (120) is sleeved on the joint (210) to be connected to the joint (210), and the flexible inner lining pipe (122) is clamped between the outer wall of the joint (210) and the outer sleeve (121).

5. The liquid collecting member (100) according to claim 1, characterized in that: The branch pipe (120) is a single-layer structure; a sealing ring (123) is embedded in the inner wall of each branch pipe (120); the branch pipe (120) is sleeved on the joint (210) to be connected to the joint (210), and the sealing ring (123) is clamped between the outer wall of the joint (210) and the inner wall of the branch pipe (120); Alternatively, a sealing ring (123) is sleeved on the outer wall of each branch pipe (120), the branch pipe (120) is passed through the joint (210) to be connected to the joint (210), and the sealing ring (123) is clamped between the inner wall of the joint (210) and the outer wall of the branch pipe (120).

6. The liquid collecting member (100) according to claim 1, characterized in that: A claw (140) is provided on each branch pipe (120), and when the branch pipe (120) is connected to the joint (210), the claw (140) is engaged with the inverted teeth (220) on the cooling plate (200).

7. The liquid collecting member (100) according to claim 6, characterized in that: The clamping claw (140) includes an elastic arm (141) and a clamping joint (142) arranged at the end of the elastic arm (141). When the branch pipe (120) is connected to the joint (210), the elastic arm (141) is squeezed by the cooling plate (200) to undergo elastic deformation in a direction away from the branch pipe (120), and generates an elastic force that causes the clamping joint (142) to be clamped into the inverted tooth (220).

8. The liquid collecting member (100) according to claim 1, characterized in that: The shielding member (130) is configured as a fan-shaped or annular shielding piece.

9. A battery pack (10), characterized in that: It comprises a plurality of cooling plates (200), a battery cell module (300) and a liquid collecting component (100) as described in any one of claims 1 to 8 above, wherein the joints (210) of the plurality of cooling plates (200) are respectively connected to the plurality of branch pipes (120), and the plurality of cooling plates (200) extend into the battery cell module (300).

10. An electrical device, characterized in that: Comprising the battery pack (10) as claimed in claim 9.

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