Liquid cooling assembly, battery module, battery pack and vehicle

Abstract

The invention relates to the field of power batteries, and discloses a liquid cooling assembly, a battery module, a battery pack and a vehicle, the liquid cooling assembly comprises a current collector and a plurality of liquid cooling parts, the plurality of liquid cooling parts are all made of composite materials and are sequentially arranged at intervals in the first direction, and a plurality of butt joint extension parts are sequentially arranged on the inner side of the current collector at intervals in a protruding mode in the first direction; according to the liquid cooling assembly, the butt-joint extension parts are arranged on the liquid cooling assembly, the butt-joint holes communicating with the current collecting cavity of the current collector are formed in the butt-joint extension parts, the ends of the liquid cooling pieces extend into the butt-joint holes to be inserted, the same ends of the liquid cooling pieces are inserted into the same current collector through the additional arrangement of the butt-joint extension parts, the rigidity of the liquid cooling assembly is obviously improved, and the phenomenon of bending deformation is avoided.

Description

Technical Field

[0001] This invention belongs to the field of power battery technology, specifically relating to liquid cooling components, battery modules, battery packs, and vehicles. Background Technology

[0002] Lithium-ion batteries are currently the most commonly used power batteries in new energy vehicles. When a new energy vehicle is running, the lithium-ion battery provides power. During operation, the lithium-ion battery generates a large amount of heat. If this heat cannot be dissipated, the accumulated heat and excessively high temperature can burn out the lithium-ion battery, or at least reduce its lifespan.

[0003] Existing lithium batteries generally use liquid cooling plates to dissipate the heat generated by the lithium battery, in order to ensure that the lithium battery is kept at its ideal operating temperature. However, existing liquid cooling plates have the following drawbacks:

[0004] 1. Metal liquid cooling plates require the application of insulating varnish, which is costly; and in the event of thermal runaway, there is still a risk of insulation failure.

[0005] 2. If the metal liquid cooling plate is made of a harder material such as 6-series aluminum, most of the energy will be directly transferred to the electrode when the bottom ball is struck, causing damage to the battery cell electrode; if the metal liquid cooling plate is made of a softer material such as 3-series aluminum, it will deform more after being subjected to force and cannot recover, which will affect the thermal management performance.

[0006] 3. The collectors at the same end of multiple liquid cooling plates are generally set up separately, and there is no connection or support between the separately set collectors, which makes them prone to bending and deformation during transportation. Summary of the Invention

[0007] The purpose of this invention is to provide a liquid cooling component, a battery module, a battery pack, and a vehicle, in order to solve at least one of the aforementioned technical problems.

[0008] To achieve the above objectives, a first aspect of the present invention provides a liquid cooling assembly, wherein the liquid cooling assembly includes:

[0009] Multiple liquid cooling components are all made of composite materials and are arranged sequentially at intervals along the first direction;

[0010] The collector has multiple docking extensions that protrude sequentially along the first direction on its inner side. Each of the multiple docking extensions has a docking hole that communicates with the collector's collection cavity. The end of the liquid cooling component extends into the docking hole for insertion.

[0011] In some embodiments of the present invention, the inner wall of the mating hole is recessed at the periphery of the mating interface into which the end of the liquid cooling component extends, forming a limiting step that can abut against the end of the liquid cooling component inserted from the mating interface.

[0012] In some embodiments of the present invention, the depth of the limiting step is set to be greater than or equal to 2 mm; and / or, the height of the limiting step is set to be greater than or equal to 0.1 mm and less than or equal to the plate thickness of the liquid cooling component.

[0013] In some embodiments of the present invention, the collector includes an injection-molded main body and a sealing cover plate. The injection-molded main body is formed by an integral injection molding process to have a collecting cavity, an injection process port communicating with the collecting cavity, and a plurality of docking extensions. The plurality of docking extensions are arranged to protrude sequentially and at intervals along a first direction on the inner side of the injection-molded main body. The sealing cover plate seals the injection process port and is connected to the injection-molded main body.

[0014] In some embodiments of the present invention, an embedded ring portion is formed on the side of the sealing cover portion facing the injection molding body portion, and the embedded ring portion can extend into the flow collection cavity from the injection molding process port and be laterally fitted to the inner wall of the flow collection cavity.

[0015] In some embodiments of the present invention, the light absorption rate of the injection-molded main body is set to be greater than or equal to 80%, and the light transmittance of the sealing cover plate is set to be greater than or equal to 15%.

[0016] In some embodiments of the present invention, the light absorption rate of the injection-molded main body is set to be greater than or equal to 95%, and the light transmittance of the sealing cover plate is set to be greater than or equal to 20%.

[0017] In some embodiments of the present invention, the liquid cooling component is injection molded to the collector, and the sealing cover portion is heat-melted welded or glued to the injection molded body portion of the collector.

[0018] In some embodiments of the present invention, the collector includes a first collector and a second collector, which are respectively disposed at both ends of a plurality of liquid cooling components. The collecting cavity of the first collector includes a first liquid inlet collecting cavity and a liquid outlet collecting cavity arranged sequentially along a first direction. The first liquid inlet collecting cavity and the liquid outlet collecting cavity are respectively connected to a first water inlet nozzle and a water outlet nozzle. The inner cavity walls of the first liquid inlet collecting cavity and the liquid outlet collecting cavity are each formed with a first pair of interfaces for sealing and inserting the first end of the liquid cooling component.

[0019] The inner wall of the collection chamber of the second collector has a second pair of interfaces that correspond one-to-one with the first pair of interfaces on the first liquid inlet collection chamber and the liquid outlet collection chamber. The second pair of interfaces can be used for sealed insertion of the second end of the liquid cooling component.

[0020] In some embodiments of the present invention, the collecting cavity of the first collector further includes a second inlet collecting cavity, which is located on the side of the outlet collecting cavity away from the first inlet collecting cavity. The first collector is also provided with a second water inlet nozzle that communicates with the second inlet collecting cavity. The collecting cavity of the second collector includes a first return collecting cavity and a second return collecting cavity. The inner walls of the first return collecting cavity and the second return collecting cavity are each formed with two second pairs of interfaces spaced apart along a first direction. The two second pairs of interfaces of the first return collecting cavity are respectively configured to correspond one-to-one with the first pair of interfaces of the first inlet collecting cavity and one of the interfaces of the outlet collecting cavity. The two second pairs of interfaces of the second return collecting cavity are respectively configured to correspond one-to-one with the first pair of interfaces of the second inlet collecting cavity and the other interface of the outlet collecting cavity.

[0021] And / or, the cavity walls of each collector chamber of the first collector and the second collector are open to form an injection molding process port.

[0022] In some embodiments of the present invention, the composite material of the part is made of plastic.

[0023] In some embodiments of the present invention, the liquid cooling component is configured as an integrally molded plastic component; and / or, the thermal conductivity of the liquid cooling component is configured to be greater than 0.2 W / m / K; and / or, the elongation at break of the liquid cooling component is configured to be 30% to 180%.

[0024] In some embodiments of the present invention, the liquid cooling component has a receiving cavity, and a plurality of ribs are provided in the receiving cavity. The plurality of ribs are spaced apart along the width direction of the liquid cooling component and all extend along the length direction of the liquid cooling component. The plurality of ribs divide the receiving cavity into a plurality of two flow channels, and the plurality of ribs are arranged parallel to each other in their extending directions.

[0025] In some embodiments of the present invention, the liquid cooling component is a liquid cooling flat tube, and the ribs are respectively connected to the inner walls of two planes of the liquid cooling flat tube and are inclined at an angle to either inner wall of the liquid cooling flat tube; the corners formed by the inner walls of the flow channel are chamfered.

[0026] In some embodiments of the present invention, the included angle is 35° to 55°.

[0027] To achieve the above objectives, a second aspect of the present invention provides a battery module, wherein the battery module includes the liquid cooling component described above.

[0028] To achieve the above objectives, a third aspect of the present invention provides a battery pack, wherein the battery pack includes the battery module as described above.

[0029] To achieve the above objectives, a fourth aspect of the present invention provides a vehicle, wherein the vehicle includes the battery pack described above.

[0030] Through the above technical solutions, the liquid cooling components, battery modules, battery packs, and vehicles provided in the embodiments of the present invention have the following beneficial effects:

[0031] When the liquid cooling component is made of a single piece of composite material, there is no need to apply additional insulating varnish, which not only reduces the cost of the liquid cooling assembly but also avoids the risk of insulation failure in the event of thermal runaway. Furthermore, due to the properties of composite materials, they can absorb most of the energy during a bottom ball impact, preventing direct energy transfer to the terminals and thus avoiding damage to the cell terminals; even when subjected to significant and irreversible deformation after stress, the thermal management performance remains unaffected.

[0032] The collector has a number of docking extensions that correspond to the number of liquid cooling components. The first ends of the multiple liquid cooling components can be inserted into the docking holes of the multiple docking extensions of the collector, which significantly improves the rigidity of the liquid cooling components and avoids bending and deformation during transportation.

[0033] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. Those skilled in the art can obtain other drawings based on the structures shown in these drawings without any inventive effort. In the drawings:

[0035] Figure 1 This is a disassembly diagram of a liquid cooling assembly according to an embodiment of the present invention;

[0036] Figure 2 for Figure 1 A schematic diagram of the structure of one embodiment of the cold plate body;

[0037] Figure 3 for Figure 2 A schematic diagram showing the dimensions of the cold plate body;

[0038] Figure 4 for Figure 1 A schematic diagram of another embodiment of the cold plate body;

[0039] Figure 5 for Figure 1 A schematic diagram of the current collector from one perspective;

[0040] Figure 6 for Figure 1 Another structural diagram of the current collector in the diagram;

[0041] Figure 7 for Figure 1 A cross-sectional view of the collector in the diagram;

[0042] Figure 8 This is a disassembly diagram of a liquid cooling assembly according to an embodiment of the present invention;

[0043] Figure 9 for Figure 8 A disassembled diagram of the first collector from one perspective;

[0044] Figure 10 for Figure 8 A disassembly diagram of the first current collector from another perspective;

[0045] Figure 11 for Figure 8 A disassembled diagram of the second collector from one perspective;

[0046] Figure 12 for Figure 8 A disassembly diagram of the second current collector from another perspective;

[0047] Figure 13 This is a disassembly diagram of a liquid cooling assembly according to an embodiment of the present invention;

[0048] Figure 14 for Figure 13 An assembly diagram of the liquid cooling components;

[0049] Figure 15 for Figure 13 A schematic diagram of the current collector from one perspective;

[0050] Figure 16 for Figure 13 Another structural diagram of the current collector in the diagram;

[0051] Figure 17 for Figure 13 A schematic diagram of the structure of the snap-fit ​​body in the diagram;

[0052] Figure 18 for Figure 13 A cross-sectional diagram of the latching body. Detailed Implementation

[0053] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0054] The following description, with reference to the accompanying drawings, describes a liquid cooling assembly, a battery module, a battery pack, and a vehicle according to the present invention.

[0055] This invention provides a liquid cooling assembly, which aims to solve the problem that a liquid cooling plate can only be fixedly installed at one position of the battery cell, and can only cool that one position, making it impossible to flexibly set the installation position. The liquid cooling assembly includes at least one liquid cooling component and a current collector. The current collector has at least one interface formed on it, which allows the liquid cooling component to be sealed and plugged in. Each liquid cooling component is respectively sealed and plugged in to the corresponding interface on the current collector.

[0056] When using the above-mentioned liquid cooling assembly, the interface formed on the current collector allows for the sealed insertion of liquid cooling components, and the number of interfaces on the current collector is not limited to one, but can be set according to actual needs. This allows the number of liquid cooling components in the liquid cooling assembly to be flexibly set, thereby flexibly adjusting the size of the liquid cooling surface of the liquid cooling assembly, and thus allowing the liquid cooling assembly to be flexibly installed in different positions of the battery cell as needed.

[0057] Optionally, the collector is also equipped with a water nozzle.

[0058] In some embodiments, there is one liquid cooling component and two manifolds. A manifold is provided at each end of the liquid cooling component. Each manifold has a connector and a water nozzle. The two ends of the liquid cooling component are respectively sealed and inserted into the connector of the corresponding manifold. The water nozzle of one manifold is used for water inlet and the water nozzle of the other manifold is used for water outlet.

[0059] In other embodiments of the present invention, there are multiple liquid cooling components, which are arranged sequentially at intervals along a first direction; there are multiple collectors, with a collector provided at each end of each liquid cooling component, and one collector corresponding to at least one liquid cooling component.

[0060] Optionally, the collector is also equipped with a water nozzle.

[0061] In some embodiments, the number of liquid cooling components is two or more, and the two or more liquid cooling components are arranged sequentially at intervals along a first direction. The number of collectors is two, and each liquid cooling component shares a collector at both ends. Each collector has a matching interface corresponding to the number of liquid cooling components and a water nozzle. The two ends of the liquid cooling components are respectively sealed and inserted into the matching interface of the collector corresponding to their positions. The water nozzle of one collector is used for water inlet, and the water nozzle of the other collector is used for water outlet.

[0062] In other embodiments, the number of liquid-cooled components is two or more, and the two or more liquid-cooled components are arranged sequentially at intervals along a first direction. The two or more liquid-cooled components are divided into at least two groups, each group including at least one liquid-cooled component. When there are multiple liquid-cooled components in a group, the multiple liquid-cooled components are adjacent to each other. The number of collectors is multiple, and each group of liquid-cooled components shares one collector at each end. Each collector has a connector corresponding to the number of liquid-cooled components in that group and a water nozzle. The two ends of the liquid-cooled components are respectively sealed and inserted into the connectors of the collectors corresponding to their positions. The water nozzle of one collector is used for water inlet, and the water nozzle of the other collector is used for water outlet.

[0063] Optionally, the collector may also be equipped with two water nozzles, or it may not be equipped with any water nozzles.

[0064] In some embodiments, the number of liquid cooling components is two or more, and the two or more liquid cooling components are arranged sequentially at intervals along a first direction. The two or more liquid cooling components are divided into two groups. The first group includes at least one liquid cooling component and is located in the middle of the plurality of liquid cooling components. The second group includes at least two liquid cooling components, and the number is even. The at least two liquid cooling components in the second group are symmetrically arranged on both sides of the liquid cooling components in the first group. Each liquid cooling component shares a common collector at both ends. The collector at one end does not have a water nozzle, while the collector at the other end has two water nozzles, one for water inlet and one for water outlet.

[0065] In this embodiment of the invention, a plate is connected above the terminal of the battery cell, and the liquid cooling component of the liquid cooling assembly can be attached above the plate, on the bottom surface of the battery cell, or on any side of the battery cell to cool the battery cell.

[0066] Specifically, liquid cooling components can be placed on the battery pad, the bottom of the battery cell, the side of the battery cell, or the large surface of the battery cell to cool and heat the battery cell. The following explanation uses a battery cell module as an example. A battery cell module includes multiple rows of battery cells. When placing the liquid cooling components on the battery pad, there are two arrangements: horizontal or vertical. When placing the liquid cooling components at the bottom of the battery cells, the number of liquid cooling components can be one, two, or more. One liquid cooling component covers the bottom of all battery cells, two liquid cooling components are set for the bottom of the left and right rows of battery cells respectively, and multiple liquid cooling components are set one-to-one with multiple battery cells. When placing the liquid cooling components on the side of the battery cells, the liquid cooling components can be placed between two adjacent rows of battery cells, and the outermost side of the battery cell in the battery cell module can also have a liquid cooling component. When placing the liquid cooling components on the large surface of the battery cells, one liquid cooling component can be set for each large surface of the battery cell, or battery cells in multiple rows whose large surfaces are on the same plane can share one liquid cooling component.

[0067] Optionally, the liquid cooling component can be a liquid-cooled round tube, a liquid-cooled flat tube, or a liquid-cooled plate; there are no restrictions on this.

[0068] The following explanation will take a single battery cell module as an example. A battery cell module consists of multiple rows of battery cell groups, and each row of battery cell groups contains multiple battery cells.

[0069] The aforementioned liquid cooling assembly, by setting different numbers of liquid cooling components, current collectors, and different connection methods between the liquid cooling components and current collectors, can allow the liquid cooling components of the liquid cooling assembly to be located in different positions within the battery cells of the battery cell module, for example:

[0070] When the liquid cooling component is a liquid-cooled round tube or a liquid-cooled flat tube, one liquid cooling component is attached to the top of a group of cells arranged in the column or transverse direction, extending in either direction. When the liquid cooling component is a liquid-cooled round tube or a liquid-cooled flat tube, at least one liquid cooling component is attached to the bottom or side of each cell arranged in the transverse direction, extending in either direction; or, at least one liquid cooling component is attached to the bottom or side of a cell in a cell group arranged in the column direction, extending in either direction. When the liquid cooling component is a liquid cooling plate, one liquid cooling component is attached to the bottom of each cell in the entire cell module; when the liquid cooling component is a liquid cooling plate, one liquid cooling component is attached to the bottom or side of each cell arranged in the transverse direction, extending in either direction; or, one liquid cooling component is attached to the bottom or side of a cell in a cell group arranged in the column direction, extending in either direction.

[0071] In some embodiments of the present invention, the liquid cooling component 100 has a receiving cavity, and at least one rib 120 is provided in the receiving cavity. The rib 120 extends along the length direction of the liquid cooling component 100. The at least one rib 120 divides the receiving cavity to form at least two flow channels 130. The flow channels 130 are used for the flow of cooling medium, and the rib 120 is used to increase the strength of the liquid cooling component 100.

[0072] In some embodiments, such as Figures 1 to 3 As shown, the liquid cooling component 100 is a liquid-cooled flat tube, and the ribs 120 are connected to the inner walls of two planes of the liquid-cooled flat tube, and are inclined at an angle to either plane of the liquid-cooled flat tube. The inclined ribs enable the liquid cooling component 100 to enhance its ability to absorb the expansion force of the battery cell when subjected to the expansion and compression of the battery cell, and allow the deformation of the liquid cooling component 100 to recover after the external force is removed, avoiding deformation and damage, thereby ensuring the heat dissipation effect of the battery pack and extending its service life.

[0073] In other embodiments, such as Figure 4 As shown, the rib 120 is set perpendicular to the inner wall of any plane of the liquid-cooled flat tube. When the liquid-cooled flat tube is used in a position where it will not be subjected to expansion, compression or external impact, the manufacturing difficulty of the liquid-cooled flat tube can be reduced, thereby reducing the cost of the liquid-cooled components.

[0074] In some embodiments of the present invention, there are multiple ribs 120, which are spaced apart along the width direction of the inner wall of the liquid-cooled flat tube and are arranged parallel to each other in their extending direction, so as to divide the receiving cavity into multiple flow channels 130. By increasing the number of ribs 120, the ability to absorb the expansion force of the battery cell can be further enhanced.

[0075] During charging and discharging, the battery cell will gradually expand. If the liquid cooling plate is located between two battery cells, the expanding battery cells will squeeze the liquid cooling plate. The support ribs inside the liquid cooling plate are generally set perpendicular to the inner wall of the liquid cooling plate, which limits the ability of the liquid cooling plate to absorb the expansion force of the battery cells, making it prone to deformation and damage.

[0076] To avoid the aforementioned phenomena, the ribs within the liquid cooling plate can be angled to the inner wall of any plane of the liquid cooling flat tube. During charging and discharging, the battery cell will gradually expand. If the liquid cooling plate is located between two battery cells, the expanding battery cells will compress the liquid cooling plate. However, the angled arrangement of the ribs within the liquid cooling plate to the inner wall of any plane of the liquid cooling flat tube allows the liquid cooling component to effectively absorb the expansion force of the battery cells, preventing deformation and damage.

[0077] In some embodiments of the present invention, multiple ribs 120 are disposed on the inner wall of the liquid-cooled flat tube at the same inclination angle, thereby ensuring the balance of the flow capacity of the multiple flow channels 130. Specifically, the inner wall of the liquid-cooled flat tube can be used to bond with the battery cell and serve as the subsequent flat plate segment 111. Of course, the present invention is not limited to this. The inclination angles of the multiple ribs 120 can be set to be different. When the inclination angles of two adjacent ribs 120 are different and they are set to be inclined to the same side, the length of the ribs 120 can be different, resulting in multiple levels of impact resistance. When the inclination angles of two adjacent ribs 120 are different and they are set to be inclined in opposite directions, it is beneficial to enhance the flow capacity of the formed flow channels 130.

[0078] In some embodiments of the present invention, the liquid cooling component 100 includes a cooling flat tube portion 110 and a rib 120. The cooling flat tube portion 110 circumferentially surrounds a receiving cavity and has two relatively parallel flat plate segments 111. The rib 120 extends along the length direction of the receiving cavity and connects the two flat plate segments 111. That is, the flat plate segments 111 facilitate the bonding of the liquid cooling component 100 with the battery cell. Specifically, the flat plate segments 111 may have the planar inner wall of the aforementioned liquid cooling flat tube.

[0079] Metal liquid cooling plates require a 0.7mm layer of insulating varnish, which is costly, and there is still a risk of insulation failure in the event of thermal runaway. In addition, if the metal liquid cooling plate is made of hard materials such as 6-series aluminum, most of the energy will be directly transferred to the electrode when the bottom is hit by a ball, resulting in damage to the battery cell electrode. If the metal liquid cooling plate is made of softer materials such as 3-series aluminum, it will deform more after being subjected to force and cannot recover, which will affect the thermal management performance.

[0080] To avoid the aforementioned phenomena, the liquid cooling component can be made into a single molded composite material, eliminating the need for additional insulating varnish. This not only reduces the cost of the liquid cooling assembly but also avoids the risk of insulation failure in the event of thermal runaway. Furthermore, due to the properties of composite materials, they can absorb most of the energy during bottom ball impact, preventing direct energy transfer to the terminals and thus avoiding damage to the cell terminals. Even when subjected to significant and irreversible deformation after stress, the thermal management performance remains unaffected.

[0081] In some embodiments of the present invention, the liquid cooling component 100 is a one-piece molded composite material. When the liquid cooling assembly is placed on the battery plate, the composite material, due to its insulating properties, eliminates the risk of high-temperature insulation failure of the liquid cooling plate compared to a metal liquid cooling component 100. In particular, when the liquid cooling component 100 is placed above the explosion-proof valve of the battery cell, in the event of thermal runaway of the battery cell, the composite material liquid cooling component 100 can be burned through by the high-heat material sprayed from the explosion-proof valve, allowing the coolant in the containment cavity to spray out and spray onto the explosion-proof valve of the battery cell, thereby suppressing heat propagation. Specifically, the composite material can be made of plastic material.

[0082] In some embodiments of the present invention, when the liquid cooling component 100 is disposed on the side of the battery cell or the ground of the battery cell, the liquid cooling component may be expanded, squeezed or impacted. The liquid cooling component 100 can be made into an integrally molded composite material component and includes a cooling flat tube portion 110 and at least one rib 120. The cooling flat tube portion 110 is circumferentially enclosed to form a receiving cavity and has two flat plate segments 111 arranged relatively parallel to each other. At least one rib 120 connects the two flat plate segments 111 to divide the receiving cavity to form at least two flow channels 130. The rib 120 is disposed on the flat plate segment 111 at an inclined angle. Since the liquid cooling component 100 in the liquid cooling assembly is made of a one-piece molded composite material, and the ribs 120 are set at an inclined angle on the flat plate segment 111 of the liquid cooling component 100, the combination of the composite material and the ribs enhances the absorption capacity of the expansion force of the battery cell when it is subjected to the expansion and compression of the battery cell, and the deformation of the liquid cooling component 100 can be restored after the external force disappears, thus avoiding deformation and damage, achieving the purpose of ensuring the heat dissipation effect of the battery pack and extending its service life. Furthermore, by making the liquid cooling component 100 a composite material, when the liquid cooling assembly is placed on the plate, the composite material has insulating properties, which eliminates the risk of high-temperature insulation failure of the liquid cooling plate compared to a metal liquid cooling component 100. In particular, when the liquid cooling component 100 is placed on the explosion-proof valve of the battery cell, the composite material liquid cooling component 100 can be burned through by the high-heat material sprayed from the explosion-proof valve after thermal runaway of the battery cell, thereby allowing the coolant in the receiving cavity to be sprayed out to spray the explosion-proof valve of the battery cell, thus suppressing heat spread. Furthermore, the number of ribs 120 can be multiple, for example, 5 to 7, and the multiple ribs 120 are arranged sequentially at intervals along the width direction of the receiving cavity to divide the receiving cavity into multiple flow channels 130, and the multiple ribs 120 are arranged on the flat plate segment 111 at the same inclination angle.

[0083] Understandably, the length direction of the receiving cavity refers to the direction from the inlet end of the receiving cavity to the outlet end, while the width direction of the receiving cavity is the direction in which the opening of the inlet end or the outlet end extends.

[0084] In some embodiments of the present invention, the inclination angle θ of the rib 120 is set to be not less than 30°. Specifically, the inclination angle θ of the rib 120 is set to 35° to 55°. Limiting the inclination angle of the rib 120 within the above range can enhance the absorption capacity of the cell expansion force while ensuring the flow capacity of the flow channel 130. Preferably, the inclination angle θ of the rib 120 on the flat plate segment 111 can be set to 35°, 42°, 45°, 48° and 55°. When the inclination angle θ is set to 35°, it can have a strong absorption capacity of the cell expansion force. When the inclination angle θ is set to 55°, it can have a higher flow capacity. When the inclination angle θ is set to 45°, it can ensure the balance between the two capabilities.

[0085] In some embodiments of the present invention, the liquid cooling component 100 is made of thermoplastic material. Thermoplastic materials have better elongation at break than thermosetting materials, which can further enhance the absorption capacity of the battery cell expansion force. Specifically, thermoplastic materials such as PA12, PPA, PPS, and PPO can be used for integral extrusion molding. There are no special requirements for the length dimension when using thermoplastic materials for integral extrusion molding. The above-mentioned manufacturing process of liquid cooling component 100 is particularly suitable for longer liquid cooling components 100. Of course, the present invention is not limited to this. The liquid cooling component 100 can also be made of thermosetting material. Specifically, thermosetting materials such as HCMC can be used for integral injection molding. Liquid cooling component 100 made of thermosetting material has a better thermal conductivity, so when there are higher requirements for the cooling effect of the battery, liquid cooling component 100 made of thermosetting material can be selected to improve the cooling effect.

[0086] In some embodiments of the present invention, the thermal conductivity of the liquid cooler 100 is set to be greater than 0.2 W / m / K. By limiting the thermal conductivity of the liquid cooler 100, the thermal conductivity performance of the liquid cooler 100 is guaranteed. Specifically, the thermal conductivity of the liquid cooler 100 can also be set to 0.2 W / m / K to 30 W / m / K. By further limiting the upper limit, production can be ensured within a reasonable range of production process requirements. In addition, the elongation at break of the liquid cooler 100 can be set to be greater than 0.2%, and more specifically, to 30% to 180%. By limiting the elongation at break of the liquid cooler 100, both the absorption capacity of the liquid cooler 100 to absorb the expansion force of the battery cell can be guaranteed, and the breakage of the liquid cooler 100 during the pressure test can be avoided.

[0087] In some embodiments of the present invention, the thermal conductivity of the liquid cooling component 100 is set to 0.6 W / m / K to 0.8 W / m / K, and the elongation at break of the liquid cooling component 100 is set to 40% to 60%. During the material selection process, it was found that the thermal conductivity and elongation at break of the liquid cooling component 100 are inversely related; the higher the elongation at break, the lower the thermal conductivity. Through persistent derivation and analysis by the inventors, it was determined that the liquid cooling component 100 within the above-mentioned range can both ensure excellent thermal conductivity and meet the requirement of absorbing the expansion force of the battery cell.

[0088] Specifically, the liquid-cooled component 100 has a thermal conductivity of 0.2 W / m / K and an elongation at break of 160%, exhibiting strong ability to absorb external deformation and resisting breakage; a thermal conductivity of 10 W / m / K and an elongation at break of 0.2% provide better cooling / heating performance; and a thermal conductivity of 0.73 W / m / K and an elongation at break of 46% ensure both heating / cooling capabilities and the ability to absorb external deformation. More specifically, the liquid-cooled component 100 can be a PPO component with a thermal conductivity of 0.73 W / m / K and an elongation at break of 46%.

[0089] In some embodiments of the present invention, the distance L3 between two flat plate segments 111 is set to be not less than 1 mm, and the thickness L2 of the flat plate segment 111 is set to be not less than 0.3 mm; and / or, the distance L1 between two adjacent ribs 120 is set to be not less than 1 mm, and the thickness of the rib 120 is set to be not less than 0.3 mm. These parameter limitations facilitate the extrusion process production of the liquid-cooled part 100, while also ensuring that the cavity size of the flow channel 130 is compatible with the plate thickness of the liquid-cooled part 100.

[0090] Specifically, when L1 = 1 mm, the liquid-cooled part 100 is filled with air at 205 kPa, the bulge on the plate surface is small, and the risk of detachment from the connection position with the counterpart (such as the battery cell used for cooling or heating in the liquid-cooled part 100) is small; when L1 = 10 mm, the liquid-cooled part 100 is filled with air at 205 kPa, the strength of the extrusion die increases, and the processing is easier; when L1 = 3 or 5 mm, the deformation of the liquid-cooled part 100 during air filling can be controlled, and the ease of processing can also be taken into account.

[0091] When L1 = 0.3mm, the wall thickness is small, the weight is light, the thermal resistance is low, and the thermal conductivity is better. When L2 = 5mm, the wall thickness is large, and when the liquid-cooled part is filled with air at 205Kpa, the bulging of the plate surface is small, and the risk of detachment from the connection with the other part is small. When L2 = 0.5 or 1mm, weight, thermal resistance, and bulging of the cold plate during air filling can be balanced.

[0092] When L3 = 1 mm, the space occupied in the battery pack is relatively small; when L3 = 10 mm, the strength of the extrusion die increases, making processing easier; when L3 = 3 mm or 5 mm, the space occupied in the battery pack can be controlled while also ensuring ease of processing.

[0093] In some embodiments of the present invention, the corners formed by the inner wall of the flow channel 130 are rounded. The addition of rounded corners avoids stress concentration at the corners, dispersing stress and preventing cracking. Specifically, the rounded corner radius is greater than 0.1 mm, and can be 0.2 mm, 0.5 mm, etc. Specifically, the cross-section of the flow channel 130 can be triangular or quadrilateral. Particularly when two adjacent ribs 120 are arranged at the same angle on the sidewall of the liquid cooler 100 for bonding with the battery cell, the cross-section of the flow channel 130 between the two adjacent ribs 120 can be parallelogram-shaped.

[0094] Please see again Figure 2 In some embodiments of the present invention, the cooling flat tube portion 110 further includes a first arc plate segment 112 and a second arc plate segment 113. One flat plate segment 111, the first arc plate segment 112, the other flat plate segment 111, and the second arc plate segment 113 are sequentially connected end-to-end to form a circumferentially enclosing cavity. Both the first arc plate segment 112 and the second arc plate segment 113 are configured as outwardly convex arc plates. Specifically, the thicknesses of the two flat plate segments 111, the first arc plate segment 112, and the second arc plate segment 113 are set to be the same.

[0095] See Figure 1 as well as Figures 5 to 7 In some embodiments of the present invention, the collector 200 of the liquid cooling assembly forms a collection cavity 215 with a mating interface 211. The mating interface 211 is formed on the outer portion 216 of the collector 200. The outer portion 216 is recessed along the periphery of the mating interface 211 to form a limiting step 212. The limiting step 212 can abut against the liquid cooling component 100 inserted from the mating interface 211. The opening of the mating interface 211 facilitates the insertion of the liquid cooling component 100 into the collector 200. At the same time, the addition of the limiting step 212 can restrict the insertion position of the liquid cooling component 100 to ensure communication between the flow channel 130 and the collection cavity 215.

[0096] In some embodiments of the present invention, the depth of the limiting step 212 is set to be not less than 2 mm to ensure the connection strength between the liquid cooling component 100 and the collector 200; and / or, the height of the limiting step 212 is set to be not less than 0.1 mm and not greater than the plate thickness of the liquid cooling component 100 to ensure that the flow of coolant is improved while playing a limiting role. If the height of the limiting step 212 is too small, it will not play a good limiting role, but if the height exceeds the plate thickness of the liquid cooling component 100, it will affect the overall flow resistance. Specifically, if 0.1 mm ≤ the height of the limiting step 212 ≤ the plate thickness, and the limiting step height = 0.1 mm, the collector 200 uses less material and is lighter; if the height of the limiting step 212 = the plate thickness, the processing accuracy is easy to ensure and the limiting effect is better; if the height of the limiting step 212 is the middle value between 0.1 mm and the plate thickness, the material and weight can be controlled, and the processing accuracy and limiting effect can be taken into account.

[0097] In some embodiments of the present invention, the collector 200 has a heat-fusion layer formed at the limiting step 212, which is connected to the liquid cooler 100. The addition of the heat-fusion layer can ensure the connection strength. Furthermore, the liquid cooler 100 and the collector 200 can be welded by heat fusion, such as laser welding, ultrasonic welding, etc., or they can also be connected by adhesive or by snap-fit.

[0098] In some embodiments of the present invention, the collector 200 is further provided with a chamfer 213 on the interface 211. Specifically, the collector flat tube portion 210 of the collector 200 is provided with a chamfer 213 on the interface 211. The addition of the chamfer 213 structure facilitates the guidance of the assembly between the liquid cooling component 100 and the collector 200. It is recommended that the chamfer 213 be set to not less than 0.1mm. If the chamfer 213 is too small, it will not play the role of assembly guidance.

[0099] In some embodiments of the present invention, the collector 200 includes a collecting flat tube portion 210 and a water nozzle 220. The collecting flat tube portion 210 forms a collecting cavity 215 with a connecting interface 211, and the water nozzle 220 is disposed on the outside of the collecting flat tube portion 210 and communicates with the collecting cavity 215. The arrangement of the collecting flat tube portion 210 facilitates insertion and sealing with the cooling flat tube portion 110.

[0100] Specifically, in some embodiments of the present invention, the collector 200 includes a collecting flat tube portion 210 and a water nozzle 220. The collecting flat tube portion 210 forms a collecting cavity 215 with a connecting interface 211. The water nozzle 220 is located on the outside of the collecting flat tube portion 210 and communicates with the collecting cavity 215. The inner wall of the collecting cavity 215 is recessed at the periphery of the connecting interface 211 to form a limiting step 212. The limiting step 212 can abut against the cooling flat tube portion 110 inserted from the connecting interface 211. The opening of the connecting interface 211 facilitates the insertion of the cooling flat tube portion 110 and the collecting flat tube portion 210. At the same time, the addition of the limiting step 212 can restrict the insertion position of the cooling flat tube portion 110 to ensure the communication between the flow channel 130 in the cooling flat tube portion 110 and the collecting cavity 215.

[0101] In some embodiments of the present invention, the collector 200 is designed as an integral injection molded part, that is, the water nozzle 220 and the collector flat tube 210 are integrally formed and do not require assembly connection. The water inlet and outlet directions of the water nozzle 220 can be flexibly designed according to the requirements. In addition to the traditional 90°, the angle with the surface of the collector 200 can also be 45° / 135°, 0° / 180°, etc.

[0102] like Figure 6 As shown, in some embodiments of the present invention, at least a portion of the outer peripheral surface of the collector 200 is provided with a weight-reducing groove 214. For example, the weight-reducing groove 214 may be provided on the side of the collector 200 away from the water nozzle 220, or it may be on the peripheral surface other than the connection position of the water nozzle 220, in order to achieve the purpose of product weight reduction. It is recommended that the depth of the weight-reducing groove 214 not exceed 0.8 times the wall thickness of the collector 200 to avoid the collector 200 itself having too low strength.

[0103] The collectors at the same end of multiple liquid cooling plates are usually set up separately, and there is no connecting support between the separate collectors, which makes them prone to bending and deformation during transportation.

[0104] To avoid the above phenomenon, the collector has a number of interfaces that match the number of liquid cooling components. The first ends of the multiple liquid cooling components can be inserted into the multiple interfaces of the collector one by one, which significantly improves the rigidity of the liquid cooling components and avoids bending and deformation during transportation.

[0105] like Figures 8 to 12 As shown, in some embodiments of the present invention, there are multiple liquid cooling components 300, and the multiple liquid cooling components 300 are arranged sequentially at intervals along the first direction; the first collector 410 is formed with multiple first pairs of interfaces at intervals along the first direction, and the multiple first pairs of interfaces can be used to seal and plug into the first ends of the multiple liquid cooling components 300 one by one.

[0106] When using the above-mentioned liquid cooling assembly, since the first collector 410 has a first pair of interfaces with the same number as the liquid cooling components 300, and the first ends of multiple liquid cooling components 300 can be inserted into multiple first pairs of interfaces of the first collector 410 in a one-to-one correspondence, compared with setting the collector at each end of the liquid cooling component 300 as at least two split collectors, the rigidity of the liquid cooling assembly in this invention is improved, avoiding bending and deformation during transportation.

[0107] In some embodiments of the present invention, the liquid cooling assembly further includes a second collector 420, which has a plurality of second pairs of interfaces spaced apart along a second direction. These second pairs of interfaces allow for the one-to-one sealing and insertion of the second ends of a plurality of liquid cooling components 300. The addition of the second collector 420 allows the second ends of a plurality of liquid cooling components 300 to be inserted one-to-one into the plurality of second pairs of interfaces of the second collector 420.

[0108] In some embodiments of the present invention, there are multiple liquid cooling components 300, which are arranged sequentially at intervals along a first direction. There are two collectors, designated as a first collector 410 and a second collector 420. Each of the multiple liquid cooling components 300 has a collector at both ends, and a mating interface is formed on each collector for sealing and inserting multiple liquid cooling components 300. Therefore, compared to having at least two separate collectors at each end of the liquid cooling component 300, the rigidity of the liquid cooling assembly in the present invention is further improved.

[0109] In some embodiments of the present invention, the first collector 410 and / or the second collector 420 are each formed with a collecting cavity 430 extending along a first direction. A plurality of first pairs of interfaces are connected to the collecting cavity 430 of the first collector 410, and a plurality of second pairs of interfaces are connected to the collecting cavity 430 of the second collector 420. This makes the collecting cavity 430 of the first collector 410, the collector of the second collector 420, and the receiving cavities of the plurality of liquid cooling components 300 interconnected, thereby improving the coolant flow rate.

[0110] In some embodiments of the present invention, the portion of the first collector 410 and / or the second collector 420 that connects to the liquid cooling component protrudes to form a mating extension 433, and the mating extension 433 has a mating hole that communicates with the collection cavity. The end of the mating hole away from the collection cavity forms a corresponding mating interface, and the end of the liquid cooling component 300 extends into the mating hole from the mating interface for insertion. By adding the mating extension 433, sufficient insertion space can be provided for the liquid cooling component 300, thereby improving the insertion strength of the liquid cooling component 300. Simultaneously, the end of the liquid cooling component 300 does not need to be inserted into the collection cavity, thus ensuring that the end of the liquid cooling component 300 does not obstruct the liquid flow within the collection cavity 430, guaranteeing sufficient flow space for the liquid.

[0111] Specifically, there can be multiple mating extensions 433 on the first collector 410 and / or the second collector 420. The multiple mating extensions 433 are arranged to protrude sequentially at intervals along the first direction of the first collector 410 and / or the second collector 420. Each of the multiple mating extensions 433 has a mating hole that communicates with the corresponding collector cavity 430. The outer end of the mating hole is set as a corresponding mating interface. The end of the liquid cooling component 300 extends into the mating hole from the mating interface for insertion.

[0112] In some embodiments of the present invention, the inner wall of the manifold 430 is further recessed at the periphery of the first or second pair of interfaces to form a limiting step 434, which can abut against the end of the liquid cooling component 300 inserted from the corresponding interface. The addition of the limiting step 434 can restrict the insertion position of the liquid cooling component 300 to ensure communication between the receiving cavity of the liquid cooling component 300 and the manifold 430. Specifically, the limiting step 434 is formed on the inner wall of the mating hole.

[0113] In some embodiments of the present invention, the depth of the limiting step 434 is set to be not less than 2 mm to ensure the connection strength between the liquid cooling component 300 and the collector; and / or, the height of the limiting step 434 is set to be not less than 0.1 mm and not greater than the plate thickness of the liquid cooling component 300 to ensure that the flow of coolant is improved while playing a limiting role. If the height of the limiting step 434 is too small, it will not play a good limiting role, but if the height exceeds the plate thickness of the liquid cooling component 300, it will affect the overall flow resistance. Specifically, if 0.1 mm ≤ the height of the limiting step 434 ≤ the plate thickness, the limiting step height = 0.1 mm, the collector uses less material and is lighter; if the height of the limiting step 434 = the plate thickness, the processing accuracy is easy to ensure and the limiting effect is better; if the height of the limiting step 434 is the middle value between 0.1 mm and the plate thickness, the material and weight can be controlled, and the processing accuracy and limiting effect can be taken into account.

[0114] In some embodiments of the present invention, the first collector 410 and / or the second collector 420 both include an injection-molded main body 431 and a sealing cover plate 432. The injection-molded main body 431 is integrally injection-molded to form a collecting cavity 430 and a corresponding interface. Furthermore, the injection-molded main body 431 also has an injection process port that communicates with the collecting cavity 430. The sealing cover plate 432 is used to cover the injection process port and connect to the injection-molded main body 431. The first collector 410 and the second collector 420 are initially manufactured using a separate production process. The injection molding main body 431 has a collector cavity 430 and a mating interface through an integral injection molding process. In order to facilitate mold design and demolding of the injection cavity, the injection molding main body 431 can also be designed with an injection process port that communicates with the collector cavity 430. Of course, in order to seal the injection process port, a sealing cover plate 432 needs to be manufactured separately. The sealing cover plate 432 can also be manufactured by injection molding and then placed on the injection process port. The injection molding main body 431 and the sealing cover plate 432 can be connected by a hot melt welding process to form a first hot melt layer, thereby ensuring the reliability of the connection between the two. Hot melt welding can be performed by methods such as laser welding and ultrasonic welding. Of course, the present invention is not limited to this. The injection-molded main body 431 and the sealing cover plate 432 can also be bonded together with an adhesive layer. Furthermore, the first collector 410 and the second collector 420 are not limited to injection molding, but can also be manufactured using CNC (Computer Numerical Control) technology.

[0115] Specifically, the interface is formed on the inner side of the injection molding body 431. It should be noted that the inner and outer sides in this invention are defined based on the liquid cooling component 300. The side facing the liquid cooling component 300 is defined as the inner side, and the side away from the liquid cooling component 300 is defined as the outer side. The injection molding process port is formed on the side of the injection molding body 431 adjacent to the interface.

[0116] More specifically, the first current collector 410 and the second current collector 420 can be used for injection-molded plastic parts, especially thermoplastic parts, such as PA12, PPA, PPS, PPO, etc. Of course, the present invention is not limited to this, and the first current collector 410 and the second current collector 420 can also be made into thermosetting parts.

[0117] In some embodiments of the present invention, an embedded ring portion 436 protrudes from the side of the sealing cover portion 432 facing the injection molding body portion 431. The embedded ring portion 436 extends into the injection molding process port and fits against the inner wall of the injection molding process port. This allows the sealing cover portion 432 to be pre-positioned by the embedded ring portion 436 before hot-melt welding with the injection molding body portion 431, ensuring a good subsequent connection. Specifically, the injection molding process port can be square, and the sealing cover portion 432 and the embedded ring portion 436 are designed to match it in a square shape. Furthermore, the portion of the sealing cover portion 432 located outside the embedded ring portion 436 can be hot-melt welded to the periphery of the injection molding process port.

[0118] In some embodiments of the present invention, the number of embedded ring portions 436 on the sealing cover portion 432 is set to at least two, and the at least two embedded ring portions 436 are arranged sequentially at intervals along the length direction (i.e., the first direction) of the sealing cover portion 432, so as to resist deformation and improve the strength of the sealing cover portion 432.

[0119] In some embodiments of the present invention, the light absorption rate of the injection-molded main body is set to be not less than 80%, and the light transmittance of the sealing cover plate is set to be not less than 15%. Preferably, the light absorption rate of the injection-molded main body 431 is set to be not less than 95%, and the light transmittance of the sealing cover plate 432 is set to be not less than 20%. In laser welding, in order to achieve double-layer welding, the upper layer needs to be transparent and the lower layer needs to absorb light. Therefore, by limiting the light absorption rate of the injection-molded main body 431 and the light transmittance of the sealing cover plate 432, the connection strength of the weld can be guaranteed.

[0120] Furthermore, under normal temperature conditions, the liquid cooling assembly was connected to a pressure system, filled with coolant, and all air was purged. First, a pressure of 1.2 MPa / min was applied to 4 bar, held for 1 minute, and then pressure was applied at a rate of 0.075–0.175 MPa / s until a leak, rupture, or other failure phenomenon occurred in a part of the liquid cooling assembly. Pressurization was then stopped. Specific test results are shown in the table below:

[0121]

[0122] In some embodiments of the present invention, an inlet nozzle 411, an outlet nozzle 412, and a positioning pin 440 are integrally injection molded onto the injection-molded main body 431. By integrally molding the nozzle and the positioning pin 440 onto the injection-molded main body 431, not only are assembly steps eliminated, but the sealing performance of the nozzle and the positional accuracy of the positioning pin 440 are also enhanced. Specifically, the injection-molded main body 431 of the first collector 410 is integrally injection-molded with an inlet nozzle 411, an outlet nozzle 412, and a positioning pin 440. The injection-molded main body 431 of the second collector 420 is integrally injection-molded with a positioning pin 440. Of course, the present invention is not limited to this. It can also be configured such that the injection-molded main body 431 of the first collector 410 is integrally injection-molded with an inlet nozzle 411 and a positioning pin 440, and the injection-molded main body 431 of the second collector 420 is integrally injection-molded with an outlet nozzle 412 and a positioning pin 440. At the same time, the battery casing is provided with a positioning hole through which the positioning pin 440 can pass.

[0123] In some embodiments of the present invention, when the inlet nozzle 411 and the outlet nozzle 412 are both disposed on the first collector 410, there are two types of collecting cavities 430 on the first collector 410. Specifically, the two types of collecting cavities 430 on the first collector 410 can be an inlet collecting cavity and an outlet collecting cavity. The inlet collecting cavity and the outlet collecting cavity are arranged sequentially at intervals along the first direction of the first collector 410, and the inlet nozzle 411 and the outlet nozzle 412 are respectively connected to the inlet collecting cavity and the outlet collecting cavity in a one-to-one correspondence. The inlet collecting cavity and the outlet collecting cavity on the first collector 410 are each correspondingly provided with At least one first pair of interfaces is provided so that both the inlet and outlet liquid collection chambers are connected to at least one liquid cooling component 300. Each collection chamber 430 on the second collector 420 is provided with at least two second pairs of interfaces so that each collection chamber 430 of the second collector 420 is connected to at least two liquid cooling components 300. Among the at least two liquid cooling components 300 connected to each collection chamber 430 of the second collector 420, at least one liquid cooling component 300 is connected to the inlet liquid collection chamber and at least one liquid cooling component 300 is connected to the outlet liquid collection chamber.

[0124] Specifically, the first collector 410 can have three collecting cavities 430. The three collecting cavities 430 on the first collector 410 are arranged sequentially at intervals along the first direction of the first collector 410. The two collecting cavities 430 on both sides belong to one of the liquid inlet collecting cavity and the liquid outlet collecting cavity, while the middle collecting cavity 430 belongs to the other of the liquid inlet collecting cavity and the liquid outlet collecting cavity. The number of liquid cooling components 300 is four. Two liquid cooling components 300 are respectively arranged in a one-to-one correspondence with the two collecting cavities 430 on both sides, and the other two liquid cooling components 300 are each arranged in a one-to-one correspondence with the middle collecting cavity 430. The second collector 420 can have two collecting cavities 430. The two collecting cavities 430 on the second collector 420 are arranged sequentially at intervals along the first direction of the second collector 420, and each collecting cavity 430 on the second collector 420 can be provided with two liquid cooling components 300.

[0125] In some embodiments of the present invention, the first collector 410 is provided with an inlet collection chamber and an outlet collection chamber, and a weight reduction chamber is provided between the inlet collection chamber and the outlet collection chamber to achieve the purpose of product weight reduction.

[0126] In some embodiments of the present invention, the weight reduction cavity is provided with multiple reinforcing ribs. The addition of reinforcing ribs can improve strength and resistance to deformation.

[0127] In some embodiments of the present invention, the liquid cooling component 300 may be integrally extruded and circumferentially enclosed to form a receiving cavity. Specifically, the liquid cooling component 300 is preferably a thermoplastic part manufactured by integral extrusion, using thermoplastic materials such as PA12, PPA, PPS, and PPO. Of course, it may also be selected as a thermosetting part manufactured by integral injection molding, using thermosetting materials such as HCMC.

[0128] In some embodiments of the present invention, the first current collector 410, the second current collector 420, and the liquid cooling component 300 are all made of plastic. A second heat-fusion layer is formed between the first end of the liquid cooling component 300 and the solid portion of the first current collector 410 forming a first interface, and a third heat-fusion layer is formed between the second end of the liquid cooling component 300 and the solid portion of the second current collector 420 forming a second interface. That is, after the two ends of the liquid cooling component 300 are respectively inserted into the first interface and the second interface, they can also be connected by heat fusion welding to further ensure the stability and strength of the connection. Of course, the present invention is not limited to this; the liquid cooling component 300 and the first current collector 410, as well as the liquid cooling component 300 and the second current collector 420, can also be connected by adhesive or snap-fit.

[0129] In some embodiments of the present invention, there are two methods for manufacturing the liquid cooling component.

[0130] Manufacturing Scheme 1: The injection-molded main body 431 of the first collector 410 and the second collector 420 is preferably made of thermoplastic material suitable for injection molding, such as PA12, PPA, PPS, PPO, etc., with a light absorption rate of ≥95%. It is manufactured by injection molding or CNC process. The injection-molded main body 431 includes a liquid inlet nozzle 411, a liquid outlet nozzle 412, a positioning pin 440, a mating extension 433, a collection cavity 430, a mating interface, and an injection process port. The light transmittance of the sealing cover plate 432 is required to be ≥20%, and it is also manufactured by injection molding or CNC process. Then, the sealing cover plate 432 and the injection-molded main body 431 are welded by hot melt method, such as laser welding, ultrasonic welding, etc., or by adhesive bonding. The liquid cooling part 300 is integrally extruded from thermoplastic composite material. The end of the liquid cooling part 300 is inserted into the mating interface and welded to the injection-molded main body 431 by hot melt welding. Manufacturing Option 2: The liquid cooling component 300 is first manufactured by extrusion or injection molding. Then, the cold plate is connected to the injection-molded main body 431 of the first collector 410 and the second collector 420 by injection molding, specifically by overmolding. Finally, the sealing cover plate 432 is welded to the injection-molded main body 431 by hot-melt welding.

[0131] When the liquid cooling plate and the collector are connected and sealed by adhesive, it is difficult to ensure that the adhesive is well filled in the entire sealing area. Furthermore, the adhesion strength between the adhesive and the liquid cooling plate and the collector, the coolant resistance, the adhesion strength after aging, the adhesive mixing state, and the surface treatment of the bonded surfaces all need to be carefully controlled. Problems in any of these aspects may lead to sealing failure at the connection point.

[0132] To avoid the above phenomenon, the end of the liquid cooling component is connected to a snap-fit ​​body, and the collector is provided with a first snap-fit ​​structure on the peripheral wall of the corresponding collection cavity to snap-fit ​​with the snap-fit ​​body. This allows the collector to snap-fit ​​with the snap-fit ​​body after the snap-fit ​​body is sealed and inserted into the collection cavity, which significantly improves the connection strength. At the same time, there is no need to consider the coolant resistance and aging of the adhesive layer.

[0133] like Figures 13 to 18 As shown, in some embodiments of the present invention, the liquid cooling assembly further includes a snap-fit ​​body 600, which is connected to the end of the liquid cooling component 500, and the interface of the collector 700 is available for the snap-fit ​​body 600 to be sealed and inserted into.

[0134] When using the aforementioned liquid cooling assembly, since the end of the liquid cooling component 500 is connected to a snap-fit ​​body 600, and the interface of the manifold 711 allows the snap-fit ​​body 600 to be sealed and inserted, the collector 700 can be snapped together with the snap-fit ​​body 600 after the snap-fit ​​body 600 is sealed and inserted into the manifold 711. This significantly improves the connection strength compared to using adhesive to bond the liquid cooling component 500 and the collector 700. Furthermore, there is no need to consider the coolant resistance and aging of the adhesive layer.

[0135] In some embodiments of the present invention, the collector 700 forms a collecting cavity with a mating interface. The peripheral wall of the collecting cavity 711 is provided with a first snap-fit ​​structure that snaps into the snap-fit ​​body 600. The snap-fit ​​body 600 is sleeved on the outer side of the end of the liquid cooling component 500 and forms a second snap-fit ​​structure that snaps into the first snap-fit ​​structure. By framing the snap-fit ​​body 600 on the outer side of the liquid cooling component 500 and the collector 700 on the outer side of the snap-fit ​​body 600, this nested connection method from the inside out ensures sealing performance and improves connection strength. Of course, the present invention is not limited to this; it is also possible for the end of the snap-fit ​​body 600 to mate with the end of the liquid cooling component 500.

[0136] Specifically, there are multiple first and second snap-fit ​​structures. Multiple second snap-fit ​​structures are arranged sequentially at intervals along the circumference of the snap-fit ​​body 600. Multiple first snap-fit ​​structures are arranged one-to-one with multiple second snap-fit ​​structures on the peripheral wall of the flow collection cavity 711.

[0137] In some embodiments of the present invention, the second snap-fit ​​structure is a boss 610 protruding from the outer side of the snap-fit ​​body 600, and the first snap-fit ​​structure is a snap-fit ​​hole 712, wherein the boss 610 can extend into the snap-fit ​​hole 712 for snap-fit ​​connection. Choosing to provide the boss 610 on the outer side of the snap-fit ​​body 600 facilitates the manufacturing of the snap-fit ​​body 600 and ensures the stability of the snap-fit. Specifically, the snap-fit ​​hole 712 can be a through hole to facilitate observation of whether the snap-fit ​​is in place. Of course, the present invention is not limited to this; it is also possible for the second snap-fit ​​structure to be a snap-fit ​​hole 712 and the first snap-fit ​​structure to be a boss 610 protruding from the inner wall of the collecting cavity 711.

[0138] In some embodiments of the present invention, the liquid cooling assembly further includes a seal 800, which is disposed between the outer end of the snap-fit ​​body 600 and the inner wall of the manifold 711. The addition of the seal 800 ensures the airtightness of the outer end of the snap-fit ​​body 600 when inserted into the manifold 711. It should be noted that the outer end of the snap-fit ​​body 600 is defined relative to the liquid cooling component 500; an end facing outwards from the liquid cooling component 500 can be defined as the outer end. Furthermore, the snap-fit ​​structure, which is a boss portion 610, can itself serve as a sealing element 800. For example, the snap-fit ​​body 600 can be a component with sealing performance, and the second snap-fit ​​structure on the snap-fit ​​body 600 can be a boss portion 610 that protrudes outward. The boss portion 610 is arranged in a circle around the circumference of the snap-fit ​​body 600. Correspondingly, the snap-fit ​​hole 712 formed on the peripheral wall of the collecting cavity 711 as the first snap-fit ​​structure can also be arranged in a circle. When the boss portion 610 snaps into the snap-fit ​​hole 712, not only can a snap-fit ​​connection be achieved, but also the boss portion 610 can achieve a full circle seal for the snap-fit ​​connection. At this time, the snap-fit ​​hole 712 on the peripheral wall of the collecting cavity 711 can be a blind hole.

[0139] In some embodiments of the present invention, a sealing groove 713 for accommodating the sealing member 800 is formed on the inner wall of the collecting cavity 711 opposite to the outer end of the snap-fit ​​body 600. The addition of the sealing groove 713 facilitates the pre-positioning of the sealing member 800 to ensure the stability of the sealing member 800 during the subsequent docking and assembly process of the snap-fit ​​body 600 and the collector 700. Further, a groove plate portion 714 can be formed on the inner wall of the collecting cavity 711 opposite to the outer end of the snap-fit ​​body 600. The groove plate portion 714 is spaced apart from the peripheral wall of the collecting cavity 711 with the first snap-fit ​​structure to form the sealing groove 713. That is, when the sealing member 800 is placed in the sealing groove 713, the peripheral wall of the collecting cavity 711 with the first snap-fit ​​structure can stop the sealing member 800 on the outside, and the groove plate portion 714 can stop the sealing member 800 on the inside.

[0140] In some embodiments of the present invention, the compression ratio of the seal 800 is set to 10%–40%, and the filling rate is set to 40%–110%. Too low a compression ratio and filling rate may lead to seal failure, while too high a compression ratio and filling rate will cause the material to be under strong compression for a long time, resulting in rapid degradation of material properties and seal failure. Therefore, limiting both to a suitable range ensures excellent sealing performance while also extending service life. Furthermore, at room temperature, by introducing a gas pressure of 205 kPa ± 5 kPa into the liquid cooling assembly, stabilizing the pressure for 120 seconds, and testing for 60 seconds, the leakage rate is less than 0.5 cc / min or the helium detection leakage is less than 1*10-6 Pa*m3 / s. Specific test results are shown in the table below.

[0141]

[0142]

[0143] In some embodiments of the present invention, the material of the seal 800 is EPDM (Ethylene Propylene Diene Monomer). Of course, the present invention is not limited to this, and the seal 800 can also be made of other suitable materials.

[0144] In some embodiments of the present invention, the collector 700 includes a main body 710 and a water nozzle 720. The main body 710 forms a collecting cavity 711 with a mating interface, and the water nozzle 720 is disposed on the side of the main body 710 away from the mating interface, so that the liquid flow direction in the water nozzle 720 is consistent with the liquid flow direction of the liquid cooler 500 to ensure smooth liquid flow. Further, the main body 710 includes a circumferential enclosure plate and an end sealing plate. The circumferential enclosure plate is circumferentially enclosed and encloses the collecting cavity 711. One end of the circumferential enclosure plate is open to form a mating interface, and the other end of the circumferential enclosure plate is closed by connecting with the end sealing plate. The sealing member 800 can be placed between the outer end of the snap-fit ​​body 600 and the inner side of the end sealing plate, and the water nozzle 720 is disposed on the outer side of the end sealing plate.

[0145] In some embodiments of the present invention, the outer side of the boss portion 610 is inclined upward in the direction in which it is fastened into the boss portion 610 along the fastening hole 712. This allows the peripheral wall of the collecting cavity 711 to gradually expand when the fastening body 600 and the collector 700 move and dock relative to each other, until the fastening hole 712 fastens into the boss portion 610. This provides a guiding function for the boss portion 610 and ensures the stability of the fastening. Specifically, the cross-section of the boss portion 610 can be triangular, with one side of the triangle located on the fastening body 600 and the other side inclined upward from the fastening body 600 in the direction in which it is fastened into the boss portion 610 along the fastening hole 712.

[0146] In some embodiments of the present invention, the inclination angle A of the outer side of the boss portion 610 is set to no more than 60°. If the angle is too large, it will easily lead to difficulties in assembling with the collector 700. At the same time, the height L2 of the boss portion 610 is generally in the range of 0.1mm to 2mm. If L2 is too small, it will result in insufficient tightness in the fit with the snap-fit ​​hole 712. If it is too large, it will also lead to difficulties in assembling with the collector 700.

[0147] In some embodiments of the present invention, the snap-fit ​​body 600 includes a snap-fit ​​main body 620 and an end-positioning limiting part 630. The snap-fit ​​main body 620 has a socket hole through which the end of the liquid cooling component 500 passes, and the snap-fit ​​main body 620 is provided with a second snap-fit ​​structure, specifically a boss 610 protruding from the outside of the snap-fit ​​main body 620. The end-positioning limiting part 630 is located at the outer end of the snap-fit ​​main body 620 and extends radially from the periphery of the socket hole to abut against the shaft end of the liquid cooling component 500, thereby achieving end-positioning of the socket and further improving the connection strength. Specifically, the thickness L3 of the end-positioning limiting part 630 is recommended to be ≥0.1mm. If the thickness is too small, the strength of the end-positioning limiting part 630 will be insufficient. At the same time, the size of the first guide radius R on the snap-fit ​​body 600 is recommended to be ≥0.1mm, and the size of the second guide radius 715 on the collector 700 is also recommended to be ≥0.1mm. If the size is too small, it will not play a guiding role.

[0148] In some embodiments of the present invention, the liquid cooling component 500 is made of metal or plastic, and the snap-fit ​​body 600 is made of plastic. The liquid cooling component 500 and the snap-fit ​​body 600 are connected by injection molding, thereby improving the connection strength. Specifically, the liquid cooling component 500 can be made of metal, such as 3-series or 6-series aluminum alloy, manufactured through extrusion, or it can be made of plastic, such as PPA or PPS, manufactured through extrusion. The snap-fit ​​body 600 can be made of plastic, such as PPA or PPS, and glass fiber can be added to the material to enhance structural strength. However, the glass fiber content is set to no more than 45%, as exceeding 45% will result in excessive hardness and reduced toughness of the material, which is detrimental to the assembly of the snap-fit ​​structure. The snap-fit ​​body 600 can be manufactured using processes such as one-piece injection molding or 3D printing. Furthermore, the preferred connection method for the liquid cooling component 500 and the snap-fit ​​body 600 is injection molding, but adhesive bonding or welding can also be used.

[0149] In some embodiments of the present invention, an injection-molded connecting layer may be formed between the liquid cooling component 500 and the snap-fit ​​body 620 of the snap-fit ​​body 600, and the thickness L1 of the snap-fit ​​body 620 is set to be not less than 2 mm. If the distance is too short, the connection strength will be low. Therefore, by limiting the thickness of the snap-fit ​​body 620, the connection strength can be guaranteed. Specifically, when designing and testing the thickness L1 of the snap-fit ​​body, the following data can be obtained: when L1 = 2 mm, the pull-out force between the liquid cooling component 500 and the snap-fit ​​body 600 at room temperature is 300 N, which can meet daily use; when L1 = 4 mm, the pull-out force between the liquid cooling component 500 and the snap-fit ​​body 600 at room temperature is 600 N; when L1 = 6 mm, the pull-out force between the liquid cooling component 500 and the snap-fit ​​body 600 at room temperature is 900 N.

[0150] In some embodiments of the present invention, the current collector 700 is made of metal or plastic. Specifically, the current collector 700 can be made of metal, such as 3-series or 6-series aluminum alloy, manufactured by CNC and casting processes, or it can be made of plastic materials, such as PPA, PPS, etc. Glass fiber can also be added to the material to enhance structural strength, but the glass fiber content is set to no more than 70%, as exceeding 70% will lead to poor material flowability and difficulty in processing. The current collector 700 is manufactured using processes such as one-piece injection molding and 3D printing.

[0151] The first aspect of the present invention provides a liquid cooling assembly, wherein the liquid cooling assembly includes...

[0152] A collector, on which at least one interface is formed;

[0153] At least one liquid cooling component, each of which is sealed and plugged into a corresponding interface on the collector.

[0154] In some embodiments of the present invention, the liquid cooling component has a receiving cavity, and at least one rib is provided in the receiving cavity. The rib extends along the length direction of the liquid cooling component, and the at least one rib divides the receiving cavity to form at least two flow channels.

[0155] In some embodiments of the present invention, the liquid cooling component is a liquid cooling flat tube, and the ribs are respectively connected to the inner walls of two planes of the liquid cooling flat tube, and the inner walls of either plane of the liquid cooling flat tube are inclined at an included angle.

[0156] In some embodiments of the present invention, there are multiple ribs, which are spaced apart along the width direction of the inner wall of the plane, and are arranged parallel to each other in their extension direction.

[0157] In some embodiments of the present invention, the included angle is 35° to 55°.

[0158] In some embodiments of the present invention, the liquid cooling component is configured as a one-piece molded composite material component;

[0159] And / or, the thermal conductivity of the liquid cooling component is set to be greater than 0.2 W / m / K;

[0160] And / or, the elongation at break of the liquid-cooled component is set to 30% to 180%.

[0161] In some embodiments of the present invention, the collector has a collecting cavity, the collector is connected to the docking port, and a limiting step is formed on the inner wall of the collecting cavity at the periphery of the docking port, the limiting step abutting against the liquid cooling component inserted from the docking port.

[0162] In some embodiments of the present invention, the liquid cooling assembly includes

[0163] Multiple liquid-cooled components are arranged at intervals along a first direction;

[0164] The collector has multiple interfaces spaced apart along the first direction, and the multiple interfaces can be used to seal and plug into the first ends of multiple liquid cooling components one by one.

[0165] In some embodiments of the present invention, there are multiple liquid cooling components, which are arranged sequentially at intervals along a first direction; there are multiple collectors, with a collector provided at each end of each liquid cooling component, and one collector corresponding to at least one liquid cooling component.

[0166] In some embodiments of the present invention, the portion where the collector is connected to the liquid cooling plate protrudes to form a mating extension portion, the mating extension portion having a mating hole communicating with the collector cavity, and the end of the mating hole away from the collector cavity forming a mating interface.

[0167] In some embodiments of the present invention, at least a portion of the outer peripheral surface of the collector is provided with a weight-reducing groove.

[0168] In some embodiments of the present invention, the collector includes an inlet collecting chamber and an outlet collecting chamber, and a weight reduction chamber is provided between the inlet collecting chamber and the outlet collecting chamber.

[0169] In some embodiments of the present invention, the weight reduction cavity is provided with multiple reinforcing ribs.

[0170] In some embodiments of the present invention, the collector includes an injection-molded main body and a sealing cover plate. The injection-molded main body is integrally injection-molded to form a collecting cavity and a connecting interface. The injection-molded main body also has an injection molding process hole that communicates with the collecting cavity. The sealing cover plate is sealed to the injection-molded main body, and the orthographic projection of the sealing cover plate on the side near the injection-molded main body covers the injection molding process hole.

[0171] In some embodiments of the present invention, the light absorption rate of the injection-molded main body is set to be not less than 80%, and the light transmittance of the sealing cover plate is set to be not less than 15%.

[0172] In some embodiments of the present invention, the light transmittance of the sealing cover portion is not less than 20%, and the light absorption of the injection-molded body portion is not less than 95%.

[0173] In some embodiments of the present invention, the liquid cooling assembly further includes a snap-fit ​​body, which is sealed and sleeved on the end of the liquid cooling component, and the snap-fit ​​body can be inserted and snapped into the interface of the collector.

[0174] In some embodiments of the present invention, a current collecting cavity is formed at the interface of the current collector, a first snap-fit ​​structure is provided on the peripheral wall of the current collecting cavity, and a second snap-fit ​​structure is provided on the snap-fit ​​body, wherein the first snap-fit ​​structure and the second snap-fit ​​structure are snapped together.

[0175] In some embodiments of the present invention, the second snap-fit ​​structure is a boss portion protruding from the outside of the snap-fit ​​body, and the first snap-fit ​​structure is a snap-fit ​​hole, wherein the boss portion can extend into the snap-fit ​​hole for snap-fit ​​connection.

[0176] In some embodiments of the present invention, the liquid cooling assembly further includes a seal disposed between the outer end of the snap-fit ​​body and the inner wall of the manifold.

[0177] In some embodiments of the present invention, the compression ratio of the seal is set to 10% to 40%, and the filling rate is set to 40% to 110%.

[0178] In some embodiments of the present invention, the snap-fit ​​body includes a snap-fit ​​main body and an end-directing limiting part. The snap-fit ​​main body has a socket hole through which the end of the liquid cooling component passes. The end-directing limiting part is located at the outer end of the snap-fit ​​main body and extends radially from the periphery of the socket hole to abut against the shaft end of the liquid cooling component.

[0179] Furthermore, the present invention also provides a battery module, wherein the battery module includes the liquid cooling component described above. Since the battery module employs all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0180] Furthermore, the present invention also provides a battery pack, wherein the battery pack includes the battery module according to the above-described embodiments. Since the battery pack adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0181] Furthermore, the present invention provides a vehicle comprising the battery pack described above. Since the vehicle employs all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0182] In the description of this invention, it should be understood that 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0183] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0184] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0185] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A liquid cooling assembly, characterized in that, The liquid cooling assembly includes: Multiple liquid cooling components are all made of composite materials and are arranged sequentially at intervals along the first direction; The collector has multiple docking extensions that protrude sequentially at intervals along a first direction on its inner side. Each of the multiple docking extensions has a docking hole that communicates with the collection cavity of the collector. The end of the liquid cooling component extends into the docking hole for insertion.

2. The liquid cooling assembly according to claim 1, characterized in that, The inner wall of the mating hole is recessed at the periphery of the mating interface into which the end of the liquid cooler extends, forming a limiting step that abuts against the end of the liquid cooler inserted from the mating interface.

3. The liquid cooling assembly according to claim 2, characterized in that, The depth of the limiting step is set to be greater than or equal to 2 mm; and / or the height of the limiting step is set to be greater than or equal to 0.1 mm and less than or equal to the plate thickness of the liquid cooling component.

4. The liquid cooling assembly according to claim 1, characterized in that, The collector includes an injection-molded main body and a sealing cover plate. The injection-molded main body is formed by an integral injection molding process to have a collecting cavity, an injection process port communicating with the collecting cavity, and a plurality of docking extensions. The plurality of docking extensions are arranged to protrude sequentially and at intervals along a first direction on the inner side of the injection-molded main body. The sealing cover plate covers the injection process port and is connected to the injection-molded main body.

5. The liquid cooling assembly according to claim 4, characterized in that, The sealing cover plate has an embedded ring protruding from the side facing the injection molding body. The embedded ring can extend from the injection molding process port into the flow collection cavity and be laterally fitted to the inner wall of the flow collection cavity.

6. The liquid cooling assembly according to claim 4, characterized in that, The light absorption rate of the injection-molded main body is set to be greater than or equal to 80%, and the light transmittance of the sealing cover plate is set to be greater than or equal to 15%.

7. The liquid cooling assembly according to claim 6, characterized in that, The light absorption rate of the injection-molded main body is set to be greater than or equal to 95%, and the light transmittance of the sealing cover plate is set to be greater than or equal to 20%.

8. The liquid cooling assembly according to claim 4, characterized in that, The liquid cooling component is injection molded to the collector, and the sealing cover is hot-melt welded or glued to the injection molded body of the collector.

9. The liquid cooling assembly according to claim 1, characterized in that, The collector includes a first collector and a second collector, which are respectively disposed at both ends of the plurality of liquid cooling components. The collection chamber of the first collector includes a first liquid inlet collection chamber and a liquid outlet collection chamber that are sequentially separated along the first direction. The first liquid inlet collection chamber and the liquid outlet collection chamber are respectively connected to a first water inlet nozzle and a water outlet nozzle. The inner walls of the first liquid inlet collection chamber and the liquid outlet collection chamber are each formed with a first pair of interfaces for sealing and inserting the first end of the liquid cooling component. The inner wall of the collection chamber of the second collector has a second pair of interfaces that correspond one-to-one with the first pair of interfaces on the first liquid inlet collection chamber and the liquid outlet collection chamber. The second pair of interfaces can be used for sealed insertion of the second end of the liquid cooling component.

10. The liquid cooling assembly according to claim 9, characterized in that, The first collector further includes a second inlet collector, which is located on the side of the outlet collector away from the first inlet collector. The first collector is also provided with a second water inlet nozzle that communicates with the second inlet collector. The second collector includes a first return collector and a second return collector. The inner walls of the first return collector and the second return collector are each provided with two pairs of second interfaces spaced apart along the first direction. The two pairs of second interfaces of the first return collector are respectively configured to correspond one-to-one with the first pair of interfaces of the first inlet collector and one of the interfaces of the outlet collector. The two pairs of second interfaces of the second return collector are respectively configured to correspond one-to-one with the first pair of interfaces of the second inlet collector and the other interface of the outlet collector. And / or, the cavity walls of each collecting chamber of the first collector and the second collector are open to form an injection molding process port.

11. The liquid cooling assembly according to claim 1, characterized in that, The composite material component is made of plastic.

12. The liquid cooling assembly according to any one of claims 1 to 11, characterized in that, The liquid cooling component is a one-piece molded plastic part; and / or, the thermal conductivity of the liquid cooling component is greater than 0.2 W / m / K; and / or, the elongation at break of the liquid cooling component is 30% to 180%.

13. The liquid cooling assembly according to any one of claims 1 to 11, characterized in that, The liquid cooling component has a receiving cavity, and the receiving cavity is provided with a plurality of ribs. The plurality of ribs are spaced apart along the width direction of the liquid cooling component and all extend along the length direction of the liquid cooling component. The plurality of ribs divide the receiving cavity into a plurality of two flow channels, and the plurality of ribs are arranged parallel to each other in their extending directions.

14. The liquid cooling assembly according to claim 13, characterized in that, The liquid cooling component is a liquid-cooled flat tube, and the ribs are respectively connected to the inner walls of two planes of the liquid-cooled flat tube and are inclined at an angle to either inner wall of the liquid-cooled flat tube; the corners formed by the inner walls of the flow channel are chamfered.

15. The liquid cooling assembly according to claim 14, characterized in that, The included angle is 35° to 55°.

16. A battery module, characterized in that, The battery module includes a liquid cooling component according to any one of claims 1 to 15.

17. A battery pack, characterized in that, The battery pack includes the battery module according to claim 16.

18. A vehicle, characterized in that, The vehicle includes the battery pack according to claim 17.

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