Liquid cooling assembly, battery module, battery pack, and vehicle

Abstract

The present application 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 flow collecting device and at least one liquid cooling member; the flow collecting device is provided with a water port and at least one connection port is formed in the flow collecting device; and each liquid cooling member is in sealed insertion connection with a corresponding connection port in the flow collecting device. Connection ports formed in a flow collecting device can be in sealed insertion connection with liquid cooling members, and the number of connection ports in the flow collecting device can be set according to actual requirements, so that the liquid cooling assembly can be flexibly configured.

Description

Liquid cooling assembly, battery module, battery pack and vehicle

[0001] Cross-reference to related applications

[0002] The present application is based on the Chinese patent application with the application number 202410742985.9 and the filing date of June 07, 2024, the Chinese patent application with the application number 202421882670.6 and the filing date of August 05, 2024, the Chinese patent application with the application number 202411068237.3 and the filing date of August 05, 2024, the Chinese patent application with the application number 202421882648.1 and the filing date of August 05, 2024, the Chinese patent application with the application number 202411067500.7 and the filing date of August 05, 2024, and claims priority to the above-mentioned Chinese patent applications, the contents of which are hereby incorporated by reference in their entirety. TECHNICAL FIELD

[0003] The present application belongs to the technical field of power batteries, and specifically relates to a liquid cooling assembly, a battery module, a battery pack and a vehicle. BACKGROUND

[0004] Lithium batteries are currently commonly used power batteries for new energy vehicles. When the new energy vehicle is running, the lithium battery works to supply power, and in the process of working, the lithium battery generates a large amount of heat. If the heat cannot be dissipated, the heat will accumulate and the temperature will be too high, which will cause the lithium battery to burn, and at least will reduce the service life of the lithium battery.

[0005] The existing lithium battery generally uses a liquid cooling plate to take away the heat generated by the lithium battery, so as to ensure that the lithium battery is at its ideal working temperature. However, the existing liquid cooling plate has the following defects:

[0006] 1. A liquid cooling plate can only be fixedly installed at one position of the battery cell, and cooling is performed for the position, and the installation position cannot be flexibly set.

[0007] 2. The metal liquid cooling plate needs to be sprayed with insulating paint, which has a high cost; and in the case of thermal runaway, there is still a risk of insulation failure;

[0008] 3. If the metal liquid cooling plate is made of hard materials such as 6-series aluminum, most of the energy will be directly transmitted to the pole when the bottom is hit, causing damage to the pole of the battery cell; if the metal liquid cooling plate is made of soft materials such as 3-series aluminum, the deformation after receiving the force is large and cannot be restored, which will affect the thermal management performance;

[0009] 4. The current collectors at the same end of the plurality of liquid cooling plates are generally separately arranged, and the separately arranged current collectors are not connected and supported, and are prone to bending and deformation during transportation. SUMMARY

[0010] The application aims to provide a liquid cooling assembly, a battery module, a battery pack and a vehicle, and aims to solve at least one of the above technical problems.

[0011] To achieve the above-mentioned purpose, the application provides a liquid cooling assembly in the first aspect, which comprises:

[0012] A current collector, wherein a water nozzle is arranged on the current collector, and at least one docking port is formed on the current collector;

[0013] At least one liquid cooling component, wherein each liquid cooling component is in sealing plug-in connection with the corresponding docking port on the current collector.

[0014] In some embodiments of the application, the liquid cooling component has a containing cavity, a plurality of ribs are arranged in the containing cavity, the plurality of ribs are arranged at intervals along the width direction of the liquid cooling component and extend along the length direction of the liquid cooling component, so as to divide the containing cavity into a plurality of flow channels, and the plurality of ribs are arranged in parallel in the extending direction.

[0015] In some embodiments of the application, the liquid cooling component is a liquid cooling flat tube, the ribs are connected with the two inner walls of the flat tube respectively, and are arranged at an included angle with any of the inner walls of the flat tube, and the corner position of the inner wall of the flow channel is arranged as a chamfer.

[0016] In some embodiments of the application, the included angle is 35°-55°.

[0017] In some embodiments of the application, the distance between the two inner walls is greater than or equal to 1mm; and / or, the thickness of the tube wall of the liquid cooling flat tube is greater than or equal to 0.3mm; and / or, the distance between two adjacent ribs is greater than or equal to 1mm; and / or, the thickness of the rib is greater than or equal to 0.3mm.

[0018] In some embodiments of the application, the liquid cooling component is made of a composite material.

[0019] In some embodiments of the application, the liquid cooling component is an integrally formed composite material or a flat tube composite material;

[0020] And / or, the thermal conductivity of the liquid cooling component is greater than 0.2w / m / k;

[0021] And / or, the elongation at break of the liquid cooling component is 30%-180%.

[0022] In some embodiments of the application, the thermal conductivity of the liquid cooling component is 0.6w / m / k-0.8w / m / k, and / or the elongation at break of the liquid cooling component is 40%-60%.

[0023] In some embodiments of the present application, the liquid cooling member is a PPO member with a thermal conductivity of 0.73 w / m / k and an elongation at break of 46%.

[0024] In some embodiments of the present application, the current collector forms a current collection cavity, the current collection cavity is in communication with the docking interface, and an inner wall of the current collection cavity is recessed at a periphery of the docking interface to form a limiting step, the limiting step can abut against an end of the liquid cooling member inserted from the docking interface.

[0025] In some embodiments of the present application, the limiting step has a depth of not less than 2 mm; and / or, the limiting step has a height of not less than 0.1 mm and not more than a thickness of the plate body of the liquid cooling member; and / or, the current collector is formed with a hot melt layer connected with the liquid cooling member at the limiting step.

[0026] In some embodiments of the present application, the current collector is provided with a chamfer on the docking interface; and / or, the current collector is provided with a weight-reducing groove on at least part of an outer peripheral surface thereof.

[0027] In some embodiments of the present application, a portion of the current collector connected with the liquid cooling member is protruded to form a docking extension, the docking extension has a docking hole, the docking hole is in communication with a current collection cavity formed by the current collector, and an end of the docking hole away from the current collection cavity is formed as the docking interface.

[0028] To achieve the above object, the second aspect of the present application provides a liquid cooling assembly, comprising:

[0029] a plurality of liquid cooling members arranged in sequence and spaced apart along a first direction;

[0030] a current collector, an inner side of the current collector is protruded to form a plurality of docking extensions in sequence and spaced apart along the first direction, the plurality of docking extensions are each formed with a docking hole in communication with a current collection cavity of the current collector, and an end of the liquid cooling member is inserted into the docking hole for plugging.

[0031] In some embodiments of the present application, an inner wall of the docking hole is further recessed at a periphery of a docking interface for the end of the liquid cooling member to form a limiting step, the limiting step can abut against the end of the liquid cooling member inserted from the docking interface.

[0032] In some embodiments of the present application, the limiting step has a depth of greater than or equal to 2 mm; and / or, the limiting step has a height of greater than or equal to 0.1 mm and less than or equal to a thickness of the plate body of the liquid cooling member.

[0033] In some embodiments of the present application, the current collector comprises an injection molded main body part and a sealing cover part, the injection molded main body part is formed by an integral injection molding process to have a current collecting cavity and an injection molding process port and a plurality of the docking extension parts respectively opposite to the current collecting cavity, a plurality of the docking extension parts are sequentially and spaced apart protrudingly arranged along a first direction on the inner side of the injection molded main body part, and the sealing cover part covers the injection molding process port and is connected with the injection molded main body part.

[0034] In some embodiments of the present application, the water nozzle on the injection molded main body part and the injection molding process port are respectively arranged on opposite sides of the injection molded main body part.

[0035] And / or, the side of the sealing cover part facing the injection molded main body part is protrudingly formed with an embedded ring part, the embedded ring part can be laterally fitted with the inner wall of the current collecting cavity from the injection molding process port into the current collecting cavity.

[0036] In some embodiments of the present application, the light absorption rate of the injection molded main body part is not less than 80%, and the light transmittance of the sealing cover part is not less than 15%.

[0037] In some embodiments of the present application, the light absorption rate of the injection molded main body part is not less than 95%, and the light transmittance of the sealing cover part is not less than 20%.

[0038] In some embodiments of the present application, the liquid cooling member is injection molded with the current collector, and the sealing cover part is hot melt welded or adhesively connected with the injection molded main body part of the current collector.

[0039] In some embodiments of the present application, the current collector comprises a first current collector and a second current collector, the first current collector and the second current collector are respectively arranged at two ends of a plurality of the liquid cooling members, the current collecting cavity of the first current collector comprises a first liquid inlet current collecting cavity and a liquid outlet current collecting cavity sequentially and spaced apart arranged along the first direction, the first liquid inlet current collecting cavity and the liquid outlet current collecting cavity are respectively communicated with a first water inlet nozzle and a water outlet nozzle, and the inner side cavity wall of the first liquid inlet current collecting cavity and the liquid outlet current collecting cavity are both formed with a first docking port for sealingly plugging the first end of the liquid cooling member.

[0040] The inner side cavity wall of the current collecting cavity of the second current collector is formed with a second docking port corresponding to the first docking port on the first liquid inlet current collecting cavity and the liquid outlet current collecting cavity, and the second docking port is for sealingly plugging the second end of the liquid cooling member.

[0041] In some embodiments of the present application, the first current collector further comprises a second liquid inlet current collection cavity arranged on the side of the liquid outlet current collection cavity away from the first liquid inlet current collection cavity, and a second water inlet nozzle of the first current collector is arranged opposite to the second liquid inlet current collection cavity; the second current collector further comprises a first liquid return current collection cavity and a second liquid return current collection cavity, and the inner cavity walls of the first liquid return current collection cavity and the second liquid return current collection cavity are both formed with two second connection interfaces arranged at intervals along the first direction; the two second connection interfaces of the first liquid return current collection cavity are arranged one-to-one corresponding to the first connection interface of the first liquid inlet current collection cavity and one of the connection interfaces of the liquid outlet current collection cavity, respectively; and the two second connection interfaces of the second liquid return current collection cavity are arranged one-to-one corresponding to the first connection interface of the second liquid inlet current collection cavity and the other connection interface of the liquid outlet current collection cavity, respectively.

[0042] In some embodiments of the present application, the cavity walls of each current collection cavity of the first current collector and the second current collector are arranged open to form injection molding process openings.

[0043] In some embodiments of the present application, the liquid cooling member is an integrally formed flat tube plastic member.

[0044] In some embodiments of the present application, the liquid cooling member is a composite material member.

[0045] In some embodiments of the present application, the composite material member is made of plastic.

[0046] In some embodiments of the present application, the liquid cooling member is an integrally formed plastic member; and / or the thermal conductivity of the liquid cooling member is greater than 0.2 w / m / k; and / or the elongation at break of the liquid cooling member is 30% to 180%.

[0047] In some embodiments of the present application, the liquid cooling member has a containing cavity, and a plurality of ribs are arranged in the containing cavity, the plurality of ribs are arranged at intervals along the width direction of the liquid cooling member and extend along the length direction of the liquid cooling member, the plurality of ribs separate the containing cavity to form a plurality of flow channels, and the plurality of ribs are arranged in parallel in the extension direction thereof.

[0048] In some embodiments of the present application, the liquid cooling member is a liquid cooling flat tube, the ribs are connected to the two inner walls of the liquid cooling flat tube respectively, and are arranged at an included angle with any of the inner walls of the liquid cooling flat tube; and the corner position of the inner wall of the flow channel is arranged as a chamfer.

[0049] In some embodiments of the present application, the included angle is 35° to 55°.

[0050] To achieve the above object, the third aspect of the present application provides a battery module, which comprises the liquid cooling assembly.

[0051] To achieve the above object, the fourth aspect of the present application provides a battery module, which comprises a plurality of battery cells, a bottom liquid cooling plate and the liquid cooling assembly, the bottom liquid cooling plate is arranged at the bottom of the plurality of battery cells, and the liquid cooling assembly is arranged at the side of each battery cell.

[0052] To achieve the above object, the fifth aspect of the present application provides a battery module, which comprises a plurality of battery cells, a bottom liquid cooling plate and the liquid cooling assembly.

[0053] The battery module comprises a bottom liquid cooling plate, the bottom liquid cooling plate is arranged at the bottom of the plurality of battery cells, and the liquid cooling assembly is arranged at the top of the plurality of battery cells.

[0054] Alternatively, the number of the liquid cooling assemblies is at least two, and each liquid cooling assembly is arranged at the bottom and the top of the plurality of battery cells.

[0055] To achieve the above object, the sixth aspect of the present application provides a battery pack, which comprises the battery module.

[0056] To achieve the above object, the seventh aspect of the present application provides a vehicle, which comprises the battery module or the battery pack.

[0057] Through the above technical solution, the liquid cooling assembly, the battery module, the battery pack and the vehicle provided by the embodiments of the present application have the following beneficial effects:

[0058] When the liquid cooling assembly is used, the butt joint on the current collector can be used for sealing and inserting the liquid cooling member, and the number of the butt joint on the current collector is not limited to one, which can be set according to actual needs, so that the number of the liquid cooling members in the liquid cooling assembly can be flexibly set, and the size of the liquid cooling surface of the liquid cooling assembly can be flexibly adjusted, and thus the liquid cooling assembly can be flexibly installed at different positions of the battery cell as needed.

[0059] Other features and advantages of the embodiments of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0060] The accompanying drawings are included to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used together with the following specific embodiments to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For those skilled in the art, other drawings can be obtained from the structures shown in the drawings without creative labor. In the drawings:

[0061] Fig. 1 is an exploded view of a liquid cooling assembly according to an embodiment of the present application;

[0062] Fig. 2 is a structural view of one embodiment of the cold plate body in Fig. 1;

[0063] Fig. 3 is a dimensioned view of the cold plate body in Fig. 2;

[0064] Fig. 4 is a structural view of another embodiment of the cold plate body in Fig. 1;

[0065] Fig. 5 is a structural view of the current collector in Fig. 1 from one perspective;

[0066] Fig. 6 is a structural view of the current collector in Fig. 1 from another perspective;

[0067] Fig. 7 is a sectional view of the current collector in Fig. 1;

[0068] Fig. 8 is an exploded view of a liquid cooling assembly according to an embodiment of the present application;

[0069] Fig. 9 is an exploded view of the first current collector in Fig. 8 from one perspective;

[0070] Fig. 10 is an exploded view of the first current collector in Fig. 8 from another perspective;

[0071] Fig. 11 is an exploded view of the second current collector in Fig. 8 from one perspective;

[0072] Fig. 12 is an exploded view of the second current collector in Fig. 8 from another perspective;

[0073] Fig. 13 is an exploded view of a liquid cooling assembly according to an embodiment of the present application;

[0074] Fig. 14 is an assembled view of the liquid cooling assembly in Fig. 13;

[0075] Fig. 15 is a structural view of the current collector in Fig. 13 from one perspective;

[0076] Fig. 16 is a structural view of the current collector in Fig. 13 from another perspective;

[0077] Fig. 17 is a structural view of the buckle body in Fig. 13;

[0078] Fig. 18 is a sectional view of the buckle body in Fig. 13. DETAILED DESCRIPTION

[0079] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the present application.

[0080] A liquid cooling assembly, a battery module, a battery pack and a vehicle according to the present application are described below with reference to the accompanying drawings.

[0081] The present application provides a liquid cooling assembly, which is designed to solve the problem that a liquid cooling plate can only be fixedly installed at one position of a battery cell and can only cool the battery cell at the position, and cannot be flexibly installed at different positions. The liquid cooling assembly comprises at least one liquid cooling piece and a current collector, the current collector is provided with at least one docking port, the docking port is used for sealingly inserting the liquid cooling piece, and each liquid cooling piece is sealingly inserted into the corresponding docking port of the current collector.

[0082] When the liquid cooling assembly is used, the docking ports formed on the current collector are used for sealingly inserting the liquid cooling pieces, the number of the docking ports on the current collector is not limited to one, and the number of the liquid cooling pieces in the liquid cooling assembly can be flexibly set according to actual needs, so that the size of the liquid cooling surface of the liquid cooling assembly can be flexibly adjusted, and the liquid cooling assembly can be flexibly installed at different positions of the battery cell according to needs.

[0083] Optionally, the current collector is further provided with a water nozzle.

[0084] In some embodiments, the number of the liquid cooling pieces is one, the number of the current collectors is two, one end of each liquid cooling piece is provided with one current collector, each current collector is provided with one docking port and one water nozzle, and the two ends of each liquid cooling piece are sealingly inserted into the docking ports of the corresponding current collectors. The water nozzle of one current collector is used for water inlet, and the water nozzle of the other current collector is used for water outlet.

[0085] In some embodiments, the number of the liquid cooling pieces is one, the number of the current collectors is two, one end of each liquid cooling piece is provided with one current collector, each current collector is provided with one docking port and one water nozzle, and the two ends of each liquid cooling piece are sealingly inserted into the docking ports of the corresponding current collectors. The water nozzle of one current collector is used for water inlet, and the water nozzle of the other current collector is used for water outlet.

[0086] Optionally, the current collector is further provided with a water nozzle.

[0087] In some embodiments, the number of the liquid cooling pieces is one, the number of the current collectors is two, one end of each liquid cooling piece is provided with one current collector, each current collector is provided with one docking port and one water nozzle, and the two ends of each liquid cooling piece are sealingly inserted into the docking ports of the corresponding current collectors. The water nozzle of one current collector is used for water inlet, and the water nozzle of the other current collector is used for water outlet.

[0088] In some embodiments, the number of liquid cooling components is two or more, the two or more liquid cooling components are sequentially and spaced apart along the first direction, and the two or more liquid cooling components are divided into at least two groups, each group including at least one liquid cooling component, and when there are multiple liquid cooling components in a group, the multiple liquid cooling components are adjacent to each other. The number of current collectors is multiple, and each group of liquid cooling components shares one current collector at each end. Each current collector has a number of docking interfaces corresponding to the number of liquid cooling components in the group and one water nozzle, and the two ends of each liquid cooling component are respectively and sealingly inserted into the docking interface of the current collector corresponding to the liquid cooling component. The water nozzle of one current collector is used for water inlet, and the water nozzle of the other current collector is used for water outlet.

[0089] Optionally, the current collector is further provided with two water nozzles or is not provided with a water nozzle.

[0090] In some embodiments, the number of liquid cooling components is two or more, the two or more liquid cooling components are sequentially and spaced apart along the first direction, and 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 at the middle position of the multiple liquid cooling components, and the second group includes at least two liquid cooling components and has an even number. The at least two liquid cooling components in the second group are symmetrically arranged on both sides of the liquid cooling component in the first group, and each liquid cooling component shares one current collector at each end. The current collector at one end is not provided with a water nozzle, and the current collector at the other end is provided with two water nozzles for water inlet and water outlet, respectively.

[0091] In the embodiments of the present application, the pole of the battery cell is connected with an electrical connection component, which includes but is not limited to a tab, and the liquid cooling component of the liquid cooling assembly can be attached above the electrical connection component, the bottom surface of the battery cell, or any side surface of the battery cell to cool the battery cell.

[0092] Specifically, the liquid cooling assembly can be placed on the electrical connection component, the bottom of the battery cell, the side surface of the battery cell, or the large surface of the battery cell to cool and heat the battery cell. It should be noted that the any side surface of the battery cell includes the side surface of the battery cell and the large surface of the battery cell, and the area of the large surface of the battery cell is larger than that of the side surface of the battery cell. In the following, a group of battery cell modules will be taken as an example for description. The group of battery cell modules includes multiple columns of battery cells. When the liquid cooling assembly is placed on the electrical connection component, there are two forms of arrangement along the horizontal direction or the vertical direction. When the liquid cooling assembly is placed on the bottom of the battery cell, the number of the liquid cooling assembly can be one, two, or multiple. One liquid cooling assembly covers the bottom of all the battery cells, two liquid cooling assemblies are respectively arranged on the bottom of the left and right columns of battery cells, and multiple liquid cooling assemblies are one-to-one corresponding to multiple battery cells. When the liquid cooling assembly is placed on the side surface of the battery cell, the liquid cooling assembly can be arranged between two columns of adjacent battery cells, and the outermost side surface of the battery cell module can also be provided with a liquid cooling assembly. When the liquid cooling assembly is placed on the large surface of the battery cell, one liquid cooling assembly can be arranged on each large surface of the battery cell, or multiple columns of battery cells can share one liquid cooling assembly when the large surfaces of the battery cells are on the same plane.

[0093] In some embodiments, the bottom of the plurality of columns of battery cells can be provided with a bottom liquid cooling plate, and each column of battery cells can be respectively provided with a liquid cooling assembly having at least one liquid cooling member and a current collector. In some embodiments, adjacent two columns of battery cells can share one liquid cooling assembly, or each column of battery cells can be respectively provided with a corresponding liquid cooling assembly. In some embodiments, the liquid cooling assembly can be provided on the top of the plurality of columns of battery cells, and the liquid cooling assembly can have a plurality of liquid cooling members arranged along the first direction.

[0094] In some embodiments, the bottom of the plurality of columns of battery cells can not be provided with a bottom liquid cooling plate. For example, the liquid cooling assembly can have a plurality of liquid cooling members arranged along the first direction, and the number of liquid cooling assemblies can be at least two. Each liquid cooling assembly can be respectively provided on the bottom and the top of the plurality of columns of battery cells. In some embodiments, the liquid cooling member can be a liquid cooling round pipe, a liquid cooling flat pipe, or a liquid cooling plate.

[0095] In the following description, an example of a battery cell module is provided. The battery cell module includes a plurality of battery cell groups, and each battery cell group includes a plurality of battery cells.

[0096] The liquid cooling assembly described above can have different numbers of liquid cooling members and current collectors, and different connection modes of the liquid cooling members and the current collectors. In this way, the liquid cooling members of the liquid cooling assembly can be arranged at different positions of the battery cells in the battery cell module, for example:

[0097] When the liquid cooling member is a liquid cooling round pipe or a liquid cooling flat pipe, one liquid cooling member can be arranged above a group of electrical connectors arranged along the column direction or the lateral direction. When the liquid cooling member is a liquid cooling round pipe or a liquid cooling flat pipe, at least one liquid cooling member can be arranged above the bottom surface or the side surface of each battery cell arranged along the lateral direction, or at least one liquid cooling member can be arranged above the bottom surface or the side surface of one battery cell group arranged along the column direction. When the liquid cooling member is a liquid cooling plate, one liquid cooling member can be arranged above the bottom surface of each battery cell in the battery cell module. When the liquid cooling member is a liquid cooling plate, one liquid cooling member can be arranged above the bottom surface or the side surface of each battery cell arranged along the lateral direction, or one liquid cooling member can be arranged above the bottom surface or the side surface of one battery cell group arranged along the column direction.

[0098] In some embodiments of the present application, the liquid cooling member 100 has a receiving cavity, and at least one rib 120 is arranged in the receiving cavity. The at least one rib 120 extends along the length direction of the liquid cooling member 100, and the at least one rib 120 divides the receiving cavity into at least two flow channels 130. The flow channels 130 are used to flow cooling medium, and the rib 120 is used to increase the strength of the liquid cooling member 100.

[0099] In some embodiments, as shown in FIGS. 1-3, the liquid cooling member 100 is a liquid cooling flat tube, the ribs 120 are connected to the two planar inner walls of the liquid cooling flat tube respectively, and are arranged at an angle with respect to any planar inner wall of the liquid cooling flat tube. The arrangement of the inclined ribs can enhance the absorption capacity of the liquid cooling member 100 to the expansion force of the battery cell when the battery cell is expanded and extruded, and the deformation of the liquid cooling member 100 can be restored after the external force disappears, avoiding deformation damage, achieving the purpose of ensuring the heat dissipation effect of the battery pack and prolonging the service life.

[0100] In other embodiments, as shown in FIG. 4, the ribs 120 are arranged perpendicularly to any planar inner wall of the liquid cooling flat tube. When the liquid cooling flat tube is used in a position that will not be subjected to expansion and extrusion or external impact, the process difficulty of the liquid cooling flat tube can also be reduced, thereby reducing the cost of the liquid cooling assembly.

[0101] In some embodiments of the present application, the number of ribs 120 is multiple, the multiple ribs 120 are arranged at intervals along the width direction of the planar inner wall of the liquid cooling flat tube, and the multiple ribs 120 are arranged in parallel in the extension direction thereof to divide the accommodation cavity to form multiple flow channels 130. By increasing the number of ribs 120, the absorption capacity of the liquid cooling member 100 to the expansion force of the battery cell can be further enhanced.

[0102] During the charging and discharging process, the battery cell will gradually expand. If the liquid cooling plate is located between two battery cells, the expanded battery cell will extrude the liquid cooling plate. The support ribs in the liquid cooling plate are generally arranged perpendicularly to the planar inner wall of the liquid cooling plate, which limits the absorption capacity of the liquid cooling plate to the expansion force of the battery cell, and the phenomenon of deformation damage is prone to occur.

[0103] In order to avoid the above phenomenon, the ribs in the liquid cooling plate can be arranged at an angle with respect to any planar inner wall of the liquid cooling flat tube. During the charging and discharging process, the battery cell will gradually expand. If the liquid cooling plate is located between two battery cells, the expanded battery cell will extrude the liquid cooling plate. The ribs in the liquid cooling plate are arranged at an angle with respect to any planar inner wall of the liquid cooling flat tube, which enables the liquid cooling member to well absorb the expansion force of the battery cell, avoiding the phenomenon of deformation damage.

[0104] In some embodiments of the present application, the multiple ribs 120 are arranged on the planar inner wall of the liquid cooling flat tube at the same inclination angle, thereby ensuring the balance of the flow capacity of the multiple flow channels 130. Specifically, the planar inner wall of the liquid cooling flat tube can be used to adhere to the battery cell and is arranged as a subsequent flat plate section 111. Of course, the present application is not limited thereto, and the inclination angles of the multiple ribs 120 can be different. When the inclination angles of the adjacent two ribs 120 are different and are arranged to incline toward the same side, the lengths of the ribs 120 can be different, so that there are multiple levels of impact resistance. When the inclination angles of the adjacent two ribs 120 are different and are arranged to incline toward opposite directions, it is beneficial to enhance the flow capacity of the formed flow channels 130.

[0105] In some embodiments of the present application, the liquid cooling member 100 comprises the cooling flat tube part 110 and the rib 120, the cooling flat tube part 110 circumferentially encloses a receiving cavity and has two flat plate sections 111 arranged in parallel, and the rib 120 extends along the length direction of the receiving cavity and connects the two flat plate sections 111. That is, through the arrangement of the flat plate sections 111, the liquid cooling member 100 is facilitated to be attached to the battery cell. Specifically, the flat plate sections 111 can be formed with the above-mentioned in-plane wall of the liquid cooling flat tube.

[0106] The metal liquid cooling plate needs to be sprayed with 0.7mm of insulating paint, which is relatively high in cost, and in the case of thermal runaway, there is still a risk of insulation failure. 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 transmitted to the pole when the bottom ball hits, causing damage to the pole of the battery cell. If the metal liquid cooling plate is made of soft materials such as 3-series aluminum, it will deform greatly and cannot be restored after being stressed, which will affect the thermal management performance.

[0107] To avoid the above-mentioned phenomenon, the liquid cooling member can be an integrally formed composite material part, which does not need to be additionally sprayed with insulating paint, not only reducing the cost of the liquid cooling assembly, but also avoiding the risk of insulation failure in the case of thermal runaway. At the same time, due to the characteristics of the composite material, most of the energy can be absorbed when the bottom ball hits, avoiding direct transmission of energy to the pole, thereby avoiding damage to the pole of the battery cell. When it deforms greatly and cannot be restored after being stressed, it will not affect the thermal management performance.

[0108] In some embodiments of the present application, the liquid cooling member 100 is an integrally formed composite material part. When the liquid cooling assembly is arranged on the electrical connecting member, compared with the liquid cooling member 100 made of metal, the liquid cooling member 100 made of composite material can eliminate the risk of high-temperature insulation failure of the liquid cooling plate. In particular, when the liquid cooling member 100 is placed on the explosion-proof valve of the battery cell, the liquid cooling member 100 made of composite material can be burned through by the high-temperature substances sprayed by the explosion-proof valve when the battery cell experiences thermal runaway, thereby enabling the cooling liquid in the receiving cavity to be sprayed to the explosion-proof valve of the battery cell, thereby inhibiting the spread of heat. Specifically, the composite material part can be made of plastic material.

[0109] In some embodiments of the present application, when the liquid cooling component 100 is arranged on the side of the battery cell or on the ground of the battery cell, the liquid cooling assembly can be expanded and pressed or impacted, the liquid cooling component 100 can be made of a composite material and includes the cooling flat tube part 110 and at least one rib 120, the cooling flat tube part 110 circumferentially surrounds to form a receiving cavity and has two flat plate segments 111 arranged in parallel, and the at least one rib 120 connects the two flat plate segments 111 to divide the receiving cavity into at least two flow channels 130, and the rib 120 is arranged 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 composite material, and the rib 120 is arranged on the flat plate segment 111 of the liquid cooling component 100 at an inclined angle, the liquid cooling component 100 can enhance the absorption capacity of the battery cell expansion force by the arrangement of the composite material and the inclined rib, and the deformation of the liquid cooling component 100 can be restored after the external force disappears, avoiding deformation damage, achieving the purpose of ensuring the heat dissipation effect of the battery pack and prolonging the service life. In addition, the liquid cooling component 100 is made of a composite material, and when the liquid cooling assembly is arranged on the electrical connecting part, the composite material has insulation performance, which can eliminate the risk of high-temperature insulation failure of the liquid cooling plate compared with the liquid cooling component 100 made of metal. In particular, when the liquid cooling component 100 is placed on the explosion-proof valve of the battery cell, the liquid cooling component 100 made of a composite material can be burned through by the high-temperature substances sprayed by the explosion-proof valve when the battery cell is in thermal runaway, and the cooling liquid in the receiving cavity can be sprayed out to realize the spraying of the explosion-proof valve of the battery cell, thereby inhibiting the spread of heat. Further, the number of ribs 120 can be multiple, for example, 5-7, and the multiple ribs 120 are arranged in sequence 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 inclined angle.

[0110] It can be understood that the length direction of the receiving cavity refers to the direction from the water inlet end to the water outlet end of the receiving cavity, and the width direction of the receiving cavity refers to the opening extension direction of the water inlet end or the water outlet end.

[0111] In some embodiments of the present application, the inclined angle θ of the rib 120 is not less than 30°, and specifically, the inclined angle θ of the rib 120 is 35°-55°. Limiting the inclined angle θ of the rib 120 within the above range can enhance the absorption capacity of the battery cell expansion force while ensuring the flow capacity of the flow channel 130. Preferably, the inclined angle θ of the rib 120 on the flat plate segment 111 can be 35°, 42°, 45°, 48° and 55°. When the inclined angle θ is 35°, the absorption capacity of the battery cell expansion force can be stronger, when the inclined angle θ is 55°, the flow capacity can be higher, and when the inclined angle θ is 45°, the balance of the two capacities can be ensured.

[0112] In some embodiments of the present application, the liquid cooling member 100 is made of thermoplastic material. Compared with thermosetting material, the thermoplastic material has better elongation at break performance, which can further enhance the absorption capacity of the expansion force of the battery cell. Specifically, PA12, PPA, PPS, PPO and other thermoplastic materials can be used to make the liquid cooling member 100 by one-piece extrusion process. The one-piece extrusion molding using thermoplastic material does not have special requirements for the length dimension, and the manufacturing process of the liquid cooling member 100 described above is particularly suitable for the liquid cooling member 100 with a long length. Of course, the present application is not limited to this, and the liquid cooling member 100 can also be made of thermosetting material. Specifically, HCMC and other thermosetting materials can be used to make the liquid cooling member 100 by one-piece injection molding process. The liquid cooling member 100 made of thermosetting material has a better thermal conductivity, so that when the cooling effect of the battery has higher requirements, the liquid cooling member 100 made of thermosetting material can be selected to improve the cooling effect.

[0113] In some embodiments of the present application, the thermal conductivity of the liquid cooling member 100 is greater than 0.2 w / m / k. By limiting the thermal conductivity of the liquid cooling member 100, the thermal conductivity of the liquid cooling member 100 is ensured. Specifically, the thermal conductivity of the liquid cooling member 100 can also be 0.2 w / m / k to 30 w / m / k. By further limiting the upper limit value, production can be ensured within a reasonable range of production process requirements. In addition, the elongation at break of the liquid cooling member 100 can be greater than 0.2%, and more specifically 30% to 180%. By limiting the elongation at break of the liquid cooling member 100, the absorption capacity of the expansion force of the battery cell by the liquid cooling member 100 can be ensured, and the liquid cooling member 100 can also be prevented from breaking during the air pressure test.

[0114] In some embodiments of the present application, the thermal conductivity of the liquid cooling member 100 is 0.6 w / m / k to 0.8 w / m / k, and the elongation at break of the liquid cooling member 100 is 40% to 60%. It is found during material selection that the thermal conductivity and the elongation at break of the liquid cooling member 100 are inversely related. The higher the elongation at break, the lower the thermal conductivity. Through persistent deduction and analysis by the applicant, it is determined that the liquid cooling member 100 with the above index range can not only ensure excellent thermal conductivity, but also meet the demand for absorbing the expansion force of the battery cell.

[0115] Specifically, the thermal conductivity of the liquid cooling member 100 is set to 0.2 w / m / k, the elongation at break is set to 160%, the ability to absorb external force deformation is very strong, and it is not easy to break; the thermal conductivity is set to 10 w / m / K, the elongation at break is set to 0.2%, the cooling / heating effect is better; the thermal conductivity is set to 0.73 w / m / k, the elongation at break is set to 46%, that is, the heating / cooling capacity can be guaranteed, and the ability to absorb external force deformation can also be considered. More specifically, the liquid cooling member 100 can be a PPO member with a thermal conductivity of 0.73 w / m / k and an elongation at break of 46%.

[0116] In some embodiments of the present application, the distance L3 between the 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 the two adjacent rib strips 120 is set to be not less than 1 mm, and the thickness of the rib strip 120 is set to be not less than 0.3 mm. The above parameters can facilitate the production of the liquid cooling member 100 by extrusion process, and also ensure that the cavity size of the flow channel 130 is adapted to the thickness of the plate body of the liquid cooling member 100.

[0117] Specifically, 1 mm≤L1≤10 mm, when L1=1 mm, the liquid cooling member 100 is filled with air 205 Kpa, the plate surface is less likely to be raised, and the risk of disengaging from the connection position of the opponent piece (the battery cell cooled or heated by the liquid cooling member 100) is small; when L1=10 mm, the extrusion mold strength becomes larger, and the processing is easier; when L1=3 or 5 mm, the deformation of the liquid cooling member 100 when filled with air can be controlled, and the ease of processing can also be considered.

[0118] When 0.3 mm≤L2≤5 mm, L1=0.3 mm, the wall thickness is small, the weight is light, the thermal resistance is small, and the thermal conductivity is better; when L2=5 mm, the wall thickness is large, and when the liquid cooling member 100 is filled with air 205 Kpa, the plate surface is less likely to be raised, and the risk of disengaging from the connection position of the opponent piece is small; when L2=0.5 or 1 mm, the weight, thermal resistance, and the amount of swelling of the cold plate when filled with air can be considered.

[0119] When 1 mm≤L3≤10 mm, L3=1 mm, the space occupied by the battery pack is small; when L3=10 mm, the extrusion mold strength becomes larger, and the processing is easier; when L3=3 mm or 5 mm, the space occupied by the battery pack can be controlled, and the ease of processing can also be considered.

[0120] In some embodiments of the present application, the corner position formed by the inner wall of the flow channel 130 is provided with a rounded corner. The addition of the rounded corner can avoid stress concentration at the corner position, disperse the stress, and avoid the occurrence of cracking. Specifically, the radius of the rounded corner is greater than 0.1 mm, which can be 0.2 mm, 0.5 mm, etc. Specifically, the cross section of the flow channel 130 can be provided in a triangular and quadrilateral shape. In particular, when the two adjacent rib strips 120 are provided on the side wall of the liquid cooling piece 100 at the same inclination angle for abutting with the battery cell, the cross section of the flow channel 130 between the two adjacent rib strips 120 can be provided in a parallelogram shape.

[0121] Please refer to FIG. 2 again. In some embodiments of the present application, the cooling flat tube part 110 further includes a first arc plate segment 112 and a second arc plate segment 113, wherein 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 containing cavity in a circumferential direction, and the first arc plate segment 112 and the second arc plate segment 113 are both provided as outwardly protruding 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 consistent.

[0122] Referring to FIG. 1 and FIG. 5 to FIG. 7, in some embodiments of the present application, the current collector 200 of the liquid cooling assembly forms a current collecting cavity 215 with a butt joint 211. The butt joint 211 is opened on the outer connecting part 216 of the current collector 200. The outer connecting part 216 is recessed to form a limiting step 212 at the periphery of the butt joint 211. The limiting step 212 can abut against the liquid cooling piece 100 inserted from the butt joint 211. The opening of the butt joint 211 facilitates the insertion of the liquid cooling piece 100 and the current collector 200. Meanwhile, the addition of the limiting step 212 can limit the insertion position of the liquid cooling piece 100 to ensure the through connection of the flow channel 130 and the current collecting cavity 215.

[0123] In some embodiments of the present application, the depth of the limiting step 212 is not less than 2 mm to ensure the connection strength of the liquid cooling piece 100 and the current collector 200; and / or the height of the limiting step 212 is not less than 0.1 mm and not greater than the thickness of the plate body of the liquid cooling piece 100 to ensure the limiting effect while improving the smoothness of the cooling liquid flow channel. If the height of the limiting step 212 is too small, the limiting effect is not good. If the height of the limiting step 212 exceeds the thickness of the plate body of the liquid cooling piece 100, the overall flow resistance will be affected. Specifically, 0.1 mm ≤ height of the limiting step 212 ≤ thickness of the plate body, the limiting step height = 0.1 mm, the current collector 200 uses less material and is light in weight; the height of the limiting step 212 = the thickness of the plate body, the machining precision is easy to ensure, and the limiting effect is good; the height of the limiting step 212 is the intermediate value of 0.1 mm and the thickness of the plate body, which can control the material and weight, and also take into account the machining precision and limiting effect.

[0124] In some embodiments of the present application, the current collector 200 is formed with a heat melting layer at the limiting step 212 connected with the liquid cooling member 100. The heat melting layer can ensure the connection strength. Further, the liquid cooling member 100 and the current collector 200 can be welded by heat melting, such as laser welding, ultrasonic welding, or the like, or can be connected by gluing or buckling.

[0125] In some embodiments of the present application, the current collector 200 is further provided with a chamfer 213 on the butt joint 211. Specifically, the current collector 200 is provided with the chamfer 213 on the butt joint 211 of the current collecting flat tube part 210. The chamfer 213 can guide the assembly of the liquid cooling member 100 and the current collector 200. The chamfer 213 is recommended to be not less than 0.1 mm. If the chamfer 213 is too small, it cannot play a role in assembly guiding.

[0126] In some embodiments of the present application, the current collector 200 includes the current collecting flat tube part 210 and the water nozzle 220. The current collecting flat tube part 210 forms the current collecting cavity 215 with the butt joint 211. The water nozzle 220 is arranged outside the current collecting flat tube part 210 and communicates with the current collecting cavity 215. The current collecting flat tube part 210 can facilitate the plug-in sealing with the cooling flat tube part 110.

[0127] Specifically, in some embodiments of the present application, the current collector 200 includes the current collecting flat tube part 210 and the water nozzle 220. The current collecting flat tube part 210 forms the current collecting cavity 215 with the butt joint 211. The water nozzle 220 is arranged outside the current collecting flat tube part 210 and communicates with the current collecting cavity 215. The inner wall of the current collecting cavity 215 is recessed to form a limiting step 212 at the periphery of the butt joint 211. The limiting step 212 can abut against the cooling flat tube part 110 inserted from the butt joint 211. The butt joint 211 facilitates the plug-in of the cooling flat tube part 110 and the current collecting flat tube part 210. The limiting step 212 can limit the plug-in position of the cooling flat tube part 110 to ensure the communication of the flow channel 130 in the cooling flat tube part 110 and the current collecting cavity 215.

[0128] In some embodiments of the present application, the current collector 200 is an integral injection molding part, i.e., the water nozzle 220 is integrally formed with the current collecting flat tube part 210. The water nozzle 220 can be designed flexibly according to the requirements, and the angle between the surface of the current collector 200 and the inlet and outlet directions of the water nozzle 220 can be 90°, 45° / 135°, 0° / 180°, etc.

[0129] As shown in FIG. 6, in some embodiments of the present application, the at least part of the outer circumferential surface of the current collector 200 is provided with a lightening groove 214, for example, the lightening groove 214 can be provided on the side of the current collector 200 away from the water nozzle 220, or can be provided on the circumferential surface except the position connected with the water nozzle 220, so as to achieve the purpose of reducing the weight of the product. The depth of the lightening groove 214 is suggested to be not more than 0.8 times the wall thickness of the current collector 200, so as to avoid that the strength of the current collector 200 is too low.

[0130] The current collectors at the same end of the plurality of liquid cooling plates are generally provided separately, and there is no connecting support between the separately provided current collectors, and bending deformation is prone to occur during transportation.

[0131] In order to avoid the above phenomenon, the current collector is formed with a plurality of docking interfaces consistent with the number of the plurality of liquid cooling components, and the first end of the plurality of liquid cooling components is inserted one by one into the plurality of docking interfaces of the current collector, obviously making the rigidity of the liquid cooling assembly improved, avoiding the phenomenon of bending deformation during transportation.

[0132] As shown in FIGS. 8 to 12, in some embodiments of the present application, the number of the liquid cooling components 300 is a plurality, and the plurality of liquid cooling components 300 are sequentially and spaced apart along a first direction; the first current collector 410 is sequentially and spaced apart with a plurality of first docking interfaces along the first direction, and the plurality of first docking interfaces can be used for one by one corresponding sealing insertion of the first end of the plurality of liquid cooling components 300.

[0133] When the above liquid cooling assembly is used, since the first current collector 410 is formed with a plurality of first docking interfaces consistent with the number of the liquid cooling components 300, and the first end of the plurality of liquid cooling components 300 is inserted one by one into the plurality of first docking interfaces of the first current collector 410, compared with that the current collector at each end of the liquid cooling component 300 is provided as at least two separately provided current collectors, the rigidity of the liquid cooling assembly in the present application is improved, avoiding the phenomenon of bending deformation during transportation.

[0134] In some embodiments of the present application, the liquid cooling assembly further comprises a second current collector 420, and the second current collector 420 is sequentially and spaced apart with a plurality of second docking interfaces along the first direction, and the plurality of second docking interfaces can be used for one by one corresponding sealing insertion of the second end of the plurality of liquid cooling components 300. The second current collector 420 can be inserted one by one into the plurality of second docking interfaces of the second current collector 420.

[0135] In some embodiments of the present application, the number of liquid cooling components 300 is multiple, the multiple liquid cooling components 300 are sequentially and spaced apart along the first direction, the number of current collectors is two and the two current collectors are the first current collector 410 and the second current collector 420, one of the two current collectors is provided at each end of the multiple liquid cooling components 300, and the one current collector is formed with a plurality of docking interfaces for sealingly and pluggably connecting the multiple liquid cooling components 300. Thus, compared with the case where the current collector at each end of the liquid cooling component 300 is provided as at least two split current collectors, the rigidity of the liquid cooling assembly in the present application is further improved.

[0136] In some embodiments of the present application, the first current collector 410 and / or the second current collector 420 is formed with a current collecting cavity 430 extending along the first direction, the multiple first docking interfaces are in communication with the current collecting cavity 430 of the first current collector 410, and the multiple second docking interfaces are in communication with the current collecting cavity 430 of the second current collector 420, so that the current collecting cavity 430 of the first current collector 410, the current collecting cavity 430 of the second current collector 420, and the accommodating cavities of the multiple liquid cooling components 300 are in communication, so as to improve the flow rate of the cooling liquid.

[0137] In some embodiments of the present application, the part where the first current collector 410 and / or the second current collector 420 is connected with the liquid cooling component is protrudingly formed with a docking extension 433, the docking extension 433 is provided with a docking hole, the docking hole is in communication with the current collecting cavity, the end of the docking hole away from the current collecting cavity is formed with a corresponding docking interface, and the end of the liquid cooling component 300 extends into the docking hole for plugging. Thus, by additionally providing the docking extension 433, sufficient plugging space can be left for the liquid cooling component 300, so as to improve the plugging strength of the liquid cooling component 300, and at the same time, the end of the liquid cooling component 300 does not need to be inserted into the current collecting cavity, so that the end of the liquid cooling component 300 does not block the flow of the liquid in the current collecting cavity 430, and sufficient flow space is ensured for the liquid.

[0138] Specifically, the number of the docking extensions 433 on the first current collector 410 and / or the second current collector 420 can be multiple, the multiple docking extensions 433 are sequentially and spaced apart along the first direction of the first current collector 410 and / or the second current collector 420, and the multiple docking extensions 433 are each formed with a docking hole in communication with the corresponding current collecting cavity 430, the outer end of the docking hole is provided as a corresponding docking interface, and the end of the liquid cooling component 300 extends into the docking hole for plugging.

[0139] In some embodiments of the present application, the inner wall of the collecting cavity 430 is further recessed to form a limiting step 434 at the periphery of the first or second interface, 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 limit the insertion position of the liquid cooling component 300 to ensure the alignment of the accommodating cavity of the liquid cooling component 300 and the collecting cavity 430. Specifically, the limiting step 434 is formed on the inner wall of the interface hole.

[0140] In some embodiments of the present application, the depth of the limiting step 434 is not less than 2 mm to ensure the connection strength of the liquid cooling component 300 and the current collector; and / or, the height of the limiting step 434 is not less than 0.1 mm and not more than the thickness of the plate body of the liquid cooling component 300 to ensure the smoothness of the cooling liquid flow channel while playing a limiting role. If the height of the limiting step 434 is too small, it cannot play a good limiting role, but if the height exceeds the thickness of the plate body of the liquid cooling component 300, it will affect the overall flow resistance. Specifically, 0.1 mm≤ height of the limiting step 434≤ thickness of the plate body, limiting step height = 0.1 mm, the current collector uses less material and is light in weight; the height of the limiting step 434 = thickness of the plate body, the machining precision is easy to guarantee, and the limiting effect is better; the height of the limiting step 434 is the intermediate value of 0.1 mm and the thickness of the plate body, which can control the material and weight, and also take into account the machining precision and limiting effect.

[0141] In some embodiments of the present application, the first current collector 410 and / or the second current collector 420 each include an injection molded main body part 431 and a sealing cover part 432, the injection molded main body part 431 is integrally injection molded and forms a current collecting cavity 430 and a corresponding mating interface, and the injection molded main body part 431 further forms an injection molding process port communicating with the current collecting cavity 430, and the sealing cover part 432 is used to seal the injection molding process port and is connected with the injection molded main body part 431. That is, the first current collector 410 and the second current collector 420 are first produced by a split production process, the injection molded main body part 431 has the current collecting cavity 430 and the mating interface by the integral injection molding process, and in order to facilitate mold design and demolding of the injection cavity, the injection molded main body part 431 can also be designed with an injection molding process port communicating with the current collecting cavity 430, and then in order to seal the injection molding process port, the sealing cover part 432 needs to be additionally produced, the sealing cover part 432 can also be made by injection molding process, and then the sealing cover part 432 is covered on the injection molding process port, and the injection molded main body part 431 and the sealing cover part 432 can be connected by hot melt welding process to form a first hot melt layer, so as to ensure the reliability of the connection, and the hot melt welding can be laser welding, ultrasonic welding, etc. Of course, the present application is not limited thereto, and the injection molded main body part 431 and the sealing cover part 432 can also be bonded by a glue layer, and the first current collector 410 and the second current collector 420 are not limited to the injection molding process, but can also be CNC (Computer Numerical Control, numerical control milling machine) process.

[0142] Specifically, the mating interface is formed on the inner side of the injection molded main body part 431, and it needs to be particularly pointed out that the inner and outer sides in the present application are defined based on the liquid cooling piece 300, the side facing the liquid cooling piece 300 is defined as the inner side, and the side away from the liquid cooling piece 300 is defined as the outer side, and the injection molding process port is formed on the side adjacent to the mating interface on the injection molded main body part 431.

[0143] More specifically, the first current collector 410 and the second current collector 420 can be suitable for plastic parts of injection molding process, especially thermoplastic parts, such as PA12, PPA, PPS, PPO, etc., and of course the present application is not limited thereto, and the first current collector 410 and the second current collector 420 can also be thermosetting parts.

[0144] In some embodiments of the present application, the sealing cover plate portion 432 is provided with an embedded ring portion 436 protruding from the side facing the injection body portion 431, the embedded ring portion 436 extends into the injection process port and is arranged in abutment with the inner wall of the injection process port, so that before the sealing cover plate portion 432 and the injection body portion 431 are heat-welded, the sealing cover plate portion 432 can be pre-positioned by the embedded ring portion 436 to ensure the subsequent connection effect. Specifically, the injection process port can be square, the sealing cover plate portion 432 and the embedded ring portion 436 are square to match, and the part of the sealing cover plate portion 432 outside the embedded ring portion 436 can be heat-welded with the periphery of the injection process port.

[0145] In some embodiments of the present application, the number of embedded ring portions 436 on the sealing cover plate portion 432 is at least two, and the at least two embedded ring portions 436 are arranged in sequence along the length direction (i.e. the first direction) of the sealing cover plate portion 432 to resist deformation and improve the strength of the sealing cover plate portion 432.

[0146] In some embodiments of the present application, the light absorption rate of the injection body portion is not less than 80%, and the light transmission rate of the sealing cover plate portion is not less than 15%, preferably, the light absorption rate of the injection body portion 431 is not less than 95%, and the light transmission rate of the sealing cover plate portion 432 is not less than 20%. In laser welding, in order to realize double-layer welding, the upper layer needs to be light-transmissive and the lower layer needs to be light-absorbing, so that by limiting the light absorption rate of the injection body portion 431 and the light transmission rate of the sealing cover plate portion 432, the connection strength of the welding can be guaranteed.

[0147] Further, under normal temperature environment, the liquid cooling assembly is connected to the pressure system, filled with cooling liquid, all air is discharged, first at a rate of 1.2 MPa / min to 4 bar, and then at a rate of 0.075-0.175 MPa / s, until a certain part of the liquid cooling assembly fails, such as leakage, burst, etc., stop pressurizing, the specific test results are shown in the following table:

[0148] In some embodiments of the present application, the liquid inlet nozzle 411, the liquid outlet nozzle 412 and the positioning pin 440 are integrally formed on the injection molded main body 431. The water nozzle and the positioning pin 440 are integrally formed on the injection molded main body 431, so that not only the assembly steps are saved, but also the sealing of the water nozzle and the positioning accuracy of the positioning pin 440 are improved. Specifically, the liquid inlet nozzle 411, the liquid outlet nozzle 412 and the positioning pin 440 are integrally formed on the injection molded main body 431 of the first current collector 410, and the positioning pin 440 is integrally formed on the injection molded main body 431 of the second current collector 420. Of course, the present application is not limited thereto, and the liquid inlet nozzle 411 and the positioning pin 440 can be integrally formed on the injection molded main body 431 of the first current collector 410, and the liquid outlet nozzle 412 and the positioning pin 440 can be integrally formed on the injection molded main body 431 of the second current collector 420. At the same time, the battery case is provided with a positioning hole for the positioning pin 440.

[0149] In some embodiments of the present application, when the liquid inlet nozzle 411 and the liquid outlet nozzle 412 are provided on the first current collector 410, there are two kinds of current collecting cavities 430 on the first current collector 410. The two kinds of current collecting cavities 430 on the first current collector 410 can be a liquid inlet current collecting cavity and a liquid outlet current collecting cavity. The liquid inlet current collecting cavity and the liquid outlet current collecting cavity are sequentially and spaced apart along the first direction of the first current collector 410. The liquid inlet nozzle 411 and the liquid outlet nozzle 412 are respectively in communication with the liquid inlet current collecting cavity and the liquid outlet current collecting cavity. The liquid inlet current collecting cavity and the liquid outlet current collecting cavity on the first current collector 410 are each provided with at least one first connecting port, so that the liquid inlet current collecting cavity and the liquid outlet current collecting cavity are connected to at least one liquid cooling member 300. Each current collecting cavity 430 on the second current collector 420 is provided with at least two second connecting ports, so that each current collecting cavity 430 on the second current collector 420 is connected to at least two liquid cooling members 300. Among the at least two liquid cooling members 300 connected to each current collecting cavity 430 on the second current collector 420, at least one liquid cooling member 300 is provided corresponding to the liquid inlet current collecting cavity, and at least one liquid cooling member 300 is provided corresponding to the liquid outlet current collecting cavity.

[0150] Specifically, the number of the current collecting cavities 430 on the first current collector 410 can be three, the three current collecting cavities 430 on the first current collector 410 are sequentially and spacedly arranged along the first direction of the first current collector 410, and the two current collecting cavities 430 on the two sides belong to one of the liquid inlet current collecting cavity and the liquid outlet current collecting cavity, and the one current collecting cavity 430 in the middle belongs to the other one of the liquid inlet current collecting cavity and the liquid outlet current collecting cavity, the number of the liquid cooling pieces 300 is four, two liquid cooling pieces 300 are arranged in one-to-one correspondence with the two current collecting cavities 430 on the two sides respectively, and the other two liquid cooling pieces 300 are arranged in correspondence with the one current collecting cavity 430 in the middle; the number of the current collecting cavities 430 on the second current collector 420 can be two, the two current collecting cavities 430 on the second current collector 420 are sequentially and spacedly arranged along the first direction of the second current collector 420, and each current collecting cavity 430 on the second current collector 420 can be provided for two liquid cooling pieces 300.

[0151] In some embodiments of the present application, the first current collector 410 is provided with a liquid inlet current collecting cavity and a liquid outlet current collecting cavity, and a weight reduction cavity is arranged between the liquid inlet current collecting cavity and the liquid outlet current collecting cavity to achieve the purpose of product weight reduction.

[0152] In some embodiments of the present application, a plurality of reinforcing ribs are arranged inside the weight reduction cavity, and the reinforcing ribs can improve the strength and resistance to deformation.

[0153] In some embodiments of the present application, the liquid cooling piece 300 can be integrally extruded and circumferentially enclosed to form a containing cavity. Specifically, the liquid cooling piece 300 is preferably a thermoplastic piece of an integral extrusion process, using thermoplastic materials such as PA12, PPA, PPS, PPO, etc. Of course, it can also be a thermosetting piece of an integral injection molding process, using thermosetting materials such as HCMC, etc.

[0154] In some embodiments of the present application, the first current collector 410, the second current collector 420 and the liquid cooling piece 300 are all plastic pieces, and a second hot melt layer is formed between the first end of the liquid cooling piece 300 and the entity part of the first interface formed by the first current collector 410, and a third hot melt layer is formed between the second end of the liquid cooling piece 300 and the entity part of the second interface formed by the second current collector 420. That is, after the two ends of the liquid cooling piece 300 are inserted into the first interface and the second interface respectively, the two ends can also be connected by hot melt welding to further ensure the stability and strength of the connection. Of course, the present application is not limited thereto, and the liquid cooling piece 300 and the first current collector 410 and the liquid cooling piece 300 and the second current collector 420 can also be connected by gluing or buckling.

[0155] In some embodiments of the present application, there are two production schemes for the liquid cooling assembly.

[0156] The first current collector 410 and the second current collector 420 are preferably made of a thermoplastic material suitable for injection molding process, such as PA12, PPA, PPS, PPO, etc., and the material light absorption rate is required to be greater than or equal to 95%. The injection molding main body part 431 is made by injection molding or CNC process, and the injection molding main body part 431 includes a liquid inlet nozzle 411, a liquid outlet nozzle 412, a positioning pin 440, a docking extension part 433, a current collecting cavity 430, a docking port, and an injection molding process port. The sealing cover plate part 432 is made by injection molding or CNC process, and the light transmittance of the sealing cover plate part 432 is required to be greater than or equal to 20%. Then, the sealing cover plate part 432 and the injection molding main body part 431 are welded by hot melting, such as laser welding, ultrasonic welding, or connected by adhesive. The liquid cooling component 300 is made of thermoplastic composite material by integral extrusion. The end of the liquid cooling component 300 is inserted into the docking port and welded to the injection molding main body part 431 by hot melting. In the second manufacturing scheme, the liquid cooling component 300 is first made by extrusion or injection molding process, and then the cold plate and the injection molding main body part 431 of the first current collector 410 and the second current collector 420 are connected by injection molding, specifically by encapsulation injection molding, and finally the sealing cover plate part 432 and the injection molding main body part 431 are welded by hot melting.

[0157] When the liquid cooling plate and the current collector are connected and sealed by adhesive, it is difficult to ensure that the adhesive in the entire sealing area has good filling state, and the adhesive strength, cooling liquid resistance, adhesive strength after aging, adhesive mixing state, and surface treatment method of the bonded surface of the liquid cooling plate and the current collector need to be controlled. Any problem in any link may cause sealing failure at the connection position.

[0158] To avoid the above phenomenon, the end of the liquid cooling component is docked with a buckle body, and the peripheral wall of the current collecting cavity of the current collector is provided with a first buckle structure for buckling connection with the buckle body, so that after the buckle body is sealingly inserted into the current collecting cavity, the current collector can be buckled with the buckle body, and the connection strength is obviously improved. At the same time, the cooling liquid resistance of the adhesive layer and the aging of the adhesive layer do not need to be considered.

[0159] As shown in FIGS. 13-18, in some embodiments of the present application, the liquid cooling assembly further includes a buckle body 600, which is docked with the end of the liquid cooling component 500, and the docking port of the current collector 700 can be sealingly inserted into the buckle body 600.

[0160] When the liquid cooling assembly is used, the end of the liquid cooling member 500 is butted against the buckle body 600, and the butting end of the current collecting cavity 711 can be sealed and inserted into the buckle body 600 for buckling connection, so that after the buckle body 600 is sealed and inserted into the current collecting cavity 711, the current collector 700 can be buckled with the buckle body 600, and the connection strength is obviously improved compared with the connection strength of the liquid cooling member 500 and the current collector 700 by using glue.

[0161] In some embodiments of the present application, the current collector 700 forms a current collecting cavity with a butting end, the peripheral wall of the current collecting cavity 711 is provided with a first buckling structure for buckling connection with the buckle body 600, and the buckle body 600 is sleeved on the outside of the end of the liquid cooling member 500 and is formed with a second buckling structure for buckling connection with the first buckling structure. The buckle body 600 is arranged to be sleeved on the outside of the liquid cooling member 500, and the current collector 700 is sleeved on the outside of the buckle body 600, and the connection mode of nested from the inside to the outside can not only ensure the sealing performance, but also improve the connection strength. Of course, the present application is not limited to this, and the end of the buckle body 600 can also be butted against the end of the liquid cooling member 500.

[0162] Specifically, the number of the first buckling structure and the second buckling structure is multiple, the multiple second buckling structures are arranged in sequence and at intervals along the circumference of the buckle body 600, and the multiple first buckling structures are arranged in one-to-one correspondence with the multiple second buckling structures on the peripheral wall of the current collecting cavity 711.

[0163] In some embodiments of the present application, the second buckling structure is a boss portion 610 arranged to protrude on the outside of the buckle body 600, and the first buckling structure is a buckle hole 712, and the boss portion 610 can be inserted into the buckle hole 712 for buckling connection. The boss portion 610 is arranged on the outside of the buckle body 600, which can facilitate the production and manufacture of the buckle body 600, and can also ensure the stability of the buckle. Specifically, the buckle hole 712 can be a through hole to facilitate observation of whether the buckle is in place. Of course, the present application is not limited to this, and the second buckling structure can be a buckle hole 712, and the first buckling structure can be a boss portion 610 arranged to protrude on the inner wall of the current collecting cavity 711.

[0164] In some embodiments of the present application, the liquid cooling assembly further comprises a sealing member 800 disposed between the outer end of the buckle body 600 and the inner wall of the current collecting cavity 711. The sealing member 800 can ensure the sealing of the outer end of the buckle body 600 inserted into the current collecting cavity 711. It should be particularly noted that the outer end of the buckle body 600 is defined with respect to the liquid cooling member 500, and the end disposed towards the outer side of the liquid cooling member 500 can be defined as the outer end. In addition, the buckle structure provided as the boss portion 610 can also serve as the sealing member 800, for example, the buckle body 600 is provided as a sealing member, and the second buckle structure on the buckle body 600 is provided as the boss portion 610 protruding outward, and the boss portion 610 is circumferentially disposed in a ring around the buckle body 600. Correspondingly, the buckle hole 712 formed on the circumferential wall of the current collecting cavity 711 as the first buckle structure is also circumferentially disposed in a ring. When the boss portion 610 is buckled in the buckle hole 712, not only the buckle connection can be achieved, but also the whole ring sealing of the boss portion 610 to the buckle connection can be achieved. At this time, the buckle hole 712 on the circumferential wall of the current collecting cavity 711 can be provided as a blind hole.

[0165] In some embodiments of the present application, the inner wall opposite to the outer end of the buckle body 600 of the current collecting cavity 711 is provided with a sealing groove 713 for accommodating the sealing member 800. The sealing groove 713 can facilitate the pre-limiting of the sealing member 800 to ensure the stability of the sealing member 800 during the subsequent butt joint assembly of the buckle body 600 and the current collector 700. Further, the inner wall opposite to the outer end of the buckle body 600 of the current collecting cavity 711 can be provided with a groove plate portion 714 spaced apart from the circumferential wall of the current collecting cavity 711 provided with the first buckle structure to form the sealing groove 713. That is, when the sealing member 800 is disposed in the sealing groove 713, the circumferential wall of the current collecting cavity 711 provided with the first buckle 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.

[0166] In some embodiments of the present application, the compression ratio of the sealing member 800 is 10% to 40%, and the filling rate range is 40% to 110%. Too small compression ratio and filling rate can cause sealing failure, and too large compression ratio and filling rate can cause material properties to decay too quickly due to long-term compression, leading to sealing failure. Therefore, by limiting both within a suitable range, the excellent sealing performance can be ensured, and the service life can be improved. Further, at room temperature, by introducing a gas pressure of 205 KPa ± 5 KPa into the liquid cooling assembly, stabilizing for 120 s, and testing for 60 s, the leakage rate is less than 0.5 cc / min or the helium leak detection amount is less than 1*10-6 Pa*m3 / s. The specific test results are shown in the following table.

[0167] In some embodiments of the present application, the material of the sealing member 800 is EPDM (Ethylene Propylene Diene Monomer). Of course, the present application is not limited thereto, and the sealing member 800 made of other suitable materials is also possible.

[0168] In some embodiments of the present application, the current collector 700 includes a current collector body 710 and a water nozzle 720, the current collector body 710 forms a current collector cavity 711 with a docking interface, and the water nozzle 720 is arranged on the side of the current collector body 710 away from the docking interface, so that the liquid flow direction in the water nozzle 720 is consistent with the liquid flow direction of the liquid cooling member 500, to ensure the smoothness of the liquid flow. Further, the current collector body 710 includes a circumferential enclosing plate and an end sealing plate, the circumferential enclosing plate is circumferentially enclosed and enclosed to form the current collector cavity 711, one end of the circumferential enclosing plate is open to form the docking interface, and the other end of the circumferential enclosing plate is closed by connecting with the end sealing plate. The sealing member 800 can be arranged between the outer end of the buckle body 600 and the inner side of the end sealing plate, and the water nozzle 720 is arranged on the outer side of the end sealing plate.

[0169] In some embodiments of the present application, the outer side of the boss portion 610 is arranged upwardly inclined in the direction of buckling the buckle hole 712 into the boss portion 610, so that when the buckle body 600 and the current collector 700 are relatively moved and docked, the circumferential wall of the current collector cavity 711 gradually expands until the buckle hole 712 buckles into the boss portion 610, so that the boss portion 610 has a guiding effect and can ensure the stability of the buckle. Specifically, the cross section of the boss portion 610 can be triangular, one side of the triangle is arranged on the buckle body 600, and the other side is arranged upwardly inclined from the buckle body 600 in the direction of buckling the buckle hole 712 into the boss portion 610.

[0170] In some embodiments of the present application, the inclination angle A of the outer side of the boss portion 610 is not greater than 60°. If the angle is too large, it is easy to cause assembly difficulties with the current 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 cause the buckle hole 712 to be not tight enough, and if L2 is too large, it will cause assembly difficulties with the current collector 700.

[0171] In some embodiments of the present application, the buckle body 600 includes a buckle main body part 620 and an end limiting part 630. The buckle main body part 620 is formed with a sleeving hole for the end part of the liquid cooling component 500 to pass through, and the buckle main body part 620 is provided with a second buckle structure, which can be a boss part 610 protruding outward from the buckle main body part 620. The end limiting part 630 is located at the outer end of the buckle main body part 620 and radially extends from the periphery of the sleeving hole to abut against the shaft end of the liquid cooling component 500, so as to achieve end positioning of the sleeving and further improve the connection strength. Specifically, the thickness L3 of the end limiting part 630 is recommended to be greater than or equal to 0.1 mm. If the thickness is too small, the strength of the end limiting part 630 will not be enough. In addition, the size of the first guide fillet R on the buckle body 600 is recommended to be greater than or equal to 0.1 mm, and the size of the second guide fillet 715 on the current collector 700 is also recommended to be greater than or equal to 0.1 mm. If the size is too small, it will not play a guiding role.

[0172] In some embodiments of the present application, the liquid cooling component 500 is made of metal or plastic, the buckle body 600 is made of plastic, and the liquid cooling component 500 and the buckle body 600 are connected by injection molding, so as to improve the connection strength. Specifically, the liquid cooling component 500 can be made of metal, such as 3-series or 6-series aluminum alloy, which is made by extrusion, or plastic material, such as PPA or PPS, which is made by extrusion. The buckle body 600 can be made of plastic material, such as PPA or PPS, and glass fiber can be added to the material to enhance the structural strength. However, the content of glass fiber should not exceed 45%. If the content exceeds 45%, the hardness of the material itself will be too high and the toughness will be poor, which is not conducive to the assembly of the clamping structure. The buckle body 600 can be made by one-piece injection molding, 3D printing, etc. In addition, the connection mode of the liquid cooling component 500 and the buckle body 600 is preferably injection molding, and can be adhesive or welding, etc.

[0173] In some embodiments of the present application, an injection molding connection layer can be formed between the liquid cooling component 500 and the buckle main body part 620 of the buckle body 600, and the thickness L1 of the buckle main body part 620 is not less than 2 mm. If the distance is too short, the connection position will have low strength. Therefore, by limiting the thickness size of the buckle main body part 620, the connection strength can be ensured. Specifically, during the design test of the thickness L1 of the buckle main body, the following data can be obtained: when L1 = 2 mm, the pull-off force between the liquid cooling component 500 and the buckle body 600 at room temperature is 300 N, which can meet the daily use; when L1 = 4 mm, the pull-off force between the liquid cooling component 500 and the buckle body 600 at room temperature is 600 N; when L1 = 6 mm, the pull-off force between the liquid cooling component 500 and the buckle body 600 at room temperature is 900 N.

[0174] In some embodiments of the present application, 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, by a CNC and casting process, or made of plastic material, such as PPA or PPS, and glass fiber can be added to the material to enhance the structural strength, but the content of glass fiber is not more than 70%, and more than 70% will cause poor material flowability and poor processing. The current collector 700 is made by integral injection molding, 3D printing and other processes.

[0175] The first aspect of the present application provides a liquid cooling assembly, wherein the liquid cooling assembly comprises:

[0176] A current collector, at least one interface is formed on the current collector;

[0177] At least one liquid cooling component, each liquid cooling component is respectively connected in sealing and plugging manner with the corresponding interface on the current collector.

[0178] In some embodiments of the present application, the liquid cooling component has a containing cavity, at least one rib is arranged in the containing cavity, the rib respectively extends along the length direction of the liquid cooling component, and the at least one rib separates the containing cavity to form at least two flow channels.

[0179] In some embodiments of the present application, the liquid cooling component is a liquid cooling flat tube, the rib is connected with the inner wall of the two planes of the liquid cooling flat tube, and any plane inner wall of the liquid cooling flat tube is arranged in a clamped angle.

[0180] In some embodiments of the present application, the number of ribs is multiple, the multiple ribs are arranged in the width direction of the plane inner wall, and the multiple ribs are arranged in parallel in the extension direction.

[0181] In some embodiments of the present application, the clamped angle is 35°-55°.

[0182] In some embodiments of the present application, the liquid cooling component is an integrally formed composite material component.

[0183] And / or, the thermal conductivity of the liquid cooling component is greater than 0.2 w / m / k.

[0184] And / or, the elongation at break of the liquid cooling component is 30%-180%.

[0185] In some embodiments of the present application, the current collector has a current collecting cavity, the current collecting cavity is in communication with the interface, a limiting step is formed on the inner wall of the current collecting cavity at the periphery of the interface, and the limiting step abuts against the liquid cooling component inserted from the interface.

[0186] In some embodiments of the present application, the liquid cooling assembly comprises

[0187] A plurality of liquid cooling components are arranged in sequence and in interval along the first direction.

[0188] The current collector is sequentially and spacedly provided with a plurality of butt joints in the first direction, and the plurality of butt joints are capable of sealingly and pluggingly connecting the first ends of the plurality of liquid cooling components one by one.

[0189] In some embodiments of the present application, the number of liquid cooling components is plural, and the plurality of liquid cooling components are sequentially and spacedly arranged in the first direction; the number of current collectors is plural, and each liquid cooling component is provided with one current collector at each end thereof, and one current collector corresponds to at least one liquid cooling component.

[0190] In some embodiments of the present application, the part of the current collector connected with the liquid cooling plate is protruded to form a butt joint extension, the butt joint extension is provided with a butt joint hole, the butt joint hole is communicated with the current collecting cavity, and the end of the butt joint hole away from the current collecting cavity is formed as a butt joint.

[0191] In some embodiments of the present application, the at least part of the outer periphery of the current collector is provided with a weight-reducing groove.

[0192] In some embodiments of the present application, the current collector comprises a liquid inlet current collecting cavity and a liquid outlet current collecting cavity, and a weight-reducing cavity is arranged between the liquid inlet current collecting cavity and the liquid outlet current collecting cavity.

[0193] In some embodiments of the present application, a plurality of reinforcing ribs are arranged inside the weight-reducing cavity.

[0194] In some embodiments of the present application, the current collector comprises an injection molding main body part and a sealing cover plate part, the injection molding main body part is integrally injection molded to form the current collecting cavity and the butt joint, and the injection molding main body part is further provided with an injection molding process hole communicated with the current collecting cavity, the sealing cover plate part is sealingly connected with the injection molding main body part, and the orthographic projection of the side of the sealing cover plate part close to the injection molding main body part covers the injection molding process hole.

[0195] In some embodiments of the present application, the light absorption rate of the injection molding main body part is not less than 80%, and the light transmittance of the sealing cover plate part is not less than 15%.

[0196] In some embodiments of the present application, the light transmittance of the sealing cover plate part is not less than 20%, and the light absorption rate of the injection molding main body part is not less than 95%.

[0197] In some embodiments of the present application, the liquid cooling assembly further comprises a buckle body, the buckle body is sealingly sleeved at the end of the liquid cooling component, and the butt joint of the current collector is capable of sealingly and pluggingly inserting the buckle body.

[0198] In some embodiments of the present application, the butt joint of the current collector is formed with a current collecting cavity, the peripheral wall of the current collecting cavity is provided with a first clamping structure, the buckle body is provided with a second clamping structure, and the first clamping structure is clamped with the second clamping structure.

[0199] In some embodiments of the present application, the second clamping structure is a boss arranged on the outer side of the clamping body, and the first clamping structure is a clamping hole, and the boss can be inserted into the clamping hole for clamping connection.

[0200] In some embodiments of the present application, the liquid cooling assembly further comprises a sealing member arranged between the outer end of the clamping body and the inner wall of the collecting cavity.

[0201] In some embodiments of the present application, the compression ratio of the sealing member is 10% to 40%, and the filling rate range is 40% to 110%.

[0202] In some embodiments of the present application, the clamping body comprises a clamping body part and an end limiting part, the clamping body part is formed with a sleeve hole for the end part of the liquid cooling member to pass through, and the end limiting part is located at the outer end of the clamping body part and is arranged radially outward from the periphery of the sleeve hole to abut against the shaft end of the liquid cooling member.

[0203] In addition, the present application also provides a battery module, wherein the battery module comprises the liquid cooling assembly according to the above. Since the battery module adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0204] In addition, the present application also provides a battery pack, wherein the battery pack comprises the battery module according to the above. Since the battery pack adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0205] In addition, the present application also provides a vehicle, wherein the vehicle comprises the battery pack according to the above. Since the vehicle adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0206] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0207] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0208] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0209] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A liquid cooling assembly, comprising: a header provided with a water nozzle and formed with at least one mating interface; at least one liquid cooling member, each of which is sealingly and pluggably connected to the corresponding mating interface of the header. 2.The liquid cooling assembly according to claim 1, wherein the liquid cooling member is provided with a receiving cavity, and a plurality of ribs are arranged in the receiving cavity, the plurality of ribs are arranged at intervals along the width direction of the liquid cooling member and extend along the length direction of the liquid cooling member, so as to divide the receiving cavity into a plurality of flow channels, and the plurality of ribs are arranged in parallel in the extending direction. 3.The liquid cooling assembly according to claim 2, wherein the liquid cooling member is a liquid cooling flat tube, the ribs are connected to the two inner walls of the liquid cooling flat tube and are arranged at an angle with respect to any one of the two inner walls of the liquid cooling flat tube, and the corner position of the inner wall of the flow channel is arranged as a chamfer. 4.The liquid cooling assembly according to claim 3, wherein the angle is 35°-55°. 5.The liquid cooling assembly according to claim 3, wherein the distance between the two inner walls is greater than or equal to 1mm; and / or, the thickness of the tube wall of the liquid cooling flat tube is greater than or equal to 0.3mm; and / or, the distance between two adjacent ribs is greater than or equal to 1mm; and / or, the thickness of the rib is greater than or equal to 0.3mm. 6.The liquid cooling assembly according to any one of claims 1-5, wherein the liquid cooling member is made of a composite material. 7.The liquid cooling assembly according to any one of claims 1-6, wherein the liquid cooling member is an integrally formed composite material or a flat tube composite material. and / or, the thermal conductivity of the liquid cooling member is greater than 0.2w / m / k; and / or, the elongation at break of the liquid cooling member is 30%-180%. 8.The liquid cooling assembly according to any one of claims 1-7, wherein the thermal conductivity of the liquid cooling member is 0.6w / m / k-0.8w / m / k, and / or the elongation at break of the liquid cooling member is 40%-60%. 9.The liquid cooling assembly according to any one of claims 1-8, wherein the liquid cooling member is a PPO member with a thermal conductivity of 0.73w / m / k and an elongation at break of 46%. 10.The liquid cooling assembly according to any one of claims 1-9, wherein the header forms a header cavity, the header cavity communicates with the mating interface, the inner wall of the header cavity is recessed at the periphery of the mating interface to form a limiting step, and the limiting step can abut against the end of the liquid cooling member inserted from the mating interface. 11.The liquid cooling assembly according to claim 10, wherein the depth of the limiting step is not less than 2mm; and / or, the height of the limiting step is not less than 0.1mm and not greater than the thickness of the plate body of the liquid cooling member; and / or, the header is provided with a hot melt layer connected to the liquid cooling member at the limiting step.

12. The liquid cooling assembly according to any one of claims 1-11, wherein the manifold is provided with a chamfer on the interface; and / or, at least a portion of the outer periphery of the manifold is provided with a weight-reducing groove.

13. The liquid cooling assembly according to any one of claims 1-12, wherein the manifold is provided with an interface extension at the portion where the manifold is connected to the liquid cooling component, the interface extension is provided with an interface hole, the interface hole is in communication with a manifold cavity formed by the manifold, and an end of the interface hole away from the manifold cavity forms the interface.

14. A liquid cooling assembly, comprising: a plurality of liquid cooling components arranged in sequence and spaced apart along a first direction; a manifold, an inner side of the manifold is provided with a plurality of interface extensions in sequence and spaced apart along the first direction, each of the interface extensions is provided with an interface hole in communication with a manifold cavity of the manifold, and an end of the liquid cooling component is inserted into the interface hole for plugging.

15. The liquid cooling assembly according to claim 14, wherein an inner wall of the interface hole is further recessed to form a limiting step at a periphery of an interface for insertion of the end of the liquid cooling component, and the limiting step is abuttable with the end of the liquid cooling component inserted from the interface.

16. The liquid cooling assembly according to claim 15, wherein a depth of the limiting step is greater than or equal to 2 mm; and / or, a height of the limiting step is greater than or equal to 0.1 mm and less than or equal to a thickness of a plate body of the liquid cooling component.

17. The liquid cooling assembly according to any one of claims 14-16, wherein the manifold comprises an injection molded main body portion and a sealing cover plate portion, the injection molded main body portion is formed by an integral injection molding process to form a manifold cavity, an injection molding process port in communication with the manifold cavity, and a plurality of the interface extensions in sequence and spaced apart along the first direction on an inner side of the injection molded main body portion, and the sealing cover plate portion covers the injection molding process port and is connected to the injection molded main body portion.

18. The liquid cooling assembly according to claim 17, wherein a water nozzle on the injection molded main body portion and the injection molding process port are arranged on opposite sides of the injection molded main body portion; and / or, an inner embedding ring portion is protruded on a side of the sealing cover plate portion facing the injection molded main body portion, and the inner embedding ring portion is arranged to laterally fit an inner wall of the manifold cavity by being inserted into the manifold cavity from the injection molding process port.

19. The liquid cooling assembly according to claim 17, wherein an optical absorbance of the injection molded main body portion is not less than 80%, and a light transmittance of the sealing cover plate portion is not less than 15%.

20. The liquid cooling assembly according to claim 17, wherein an optical absorbance of the injection molded main body portion is not less than 95%, and a light transmittance of the sealing cover plate portion is not less than 20%.

21. The liquid cooling assembly according to claim 17, wherein the liquid cooling component is injection molded to the manifold, and the sealing cover plate portion is connected to the injection molded main body portion of the manifold by hot melt welding or adhesive bonding.

22. The liquid cooling assembly according to any one of claims 14 to 21, wherein the manifold comprises a first manifold and a second manifold, the first manifold and the second manifold are respectively arranged at two ends of the plurality of liquid cooling members, the manifold cavity of the first manifold comprises a first liquid inlet manifold cavity and a liquid outlet manifold cavity which are sequentially and separately arranged along the first direction, the first liquid inlet manifold cavity and the liquid outlet manifold cavity are respectively communicated with a first water inlet nozzle and a water outlet nozzle, and the inner cavity wall of the first liquid inlet manifold cavity and the liquid outlet manifold cavity are respectively formed with a first mating interface for sealingly inserting the first end of the liquid cooling member; the inner cavity wall of the manifold cavity of the second manifold is formed with a second mating interface corresponding to the first mating interface of the first liquid inlet manifold cavity and the liquid outlet manifold cavity, and the second mating interface is for sealingly inserting the second end of the liquid cooling member.

23. The liquid cooling assembly according to claim 22, wherein the manifold cavity of the first manifold further comprises a second liquid inlet manifold cavity, the second liquid inlet manifold cavity is arranged on the side of the liquid outlet manifold cavity away from the first liquid inlet manifold cavity, the first manifold is further provided with a second water inlet nozzle communicated with the second liquid inlet manifold cavity, the manifold cavity of the second manifold comprises a first liquid return manifold cavity and a second liquid return manifold cavity, the inner cavity wall of the first liquid return manifold cavity and the second liquid return manifold cavity are respectively formed with two second mating interfaces arranged along the first direction, the two second mating interfaces of the first liquid return manifold cavity are respectively arranged corresponding to the first mating interface of the first liquid inlet manifold cavity and one of the mating interfaces of the liquid outlet manifold cavity, and the two second mating interfaces of the second liquid return manifold cavity are respectively arranged corresponding to the first mating interface of the second liquid inlet manifold cavity and the other mating interface of the liquid outlet manifold cavity; and / or, the cavity wall of each manifold cavity of the first manifold and the second manifold is open to form an injection molding process interface.

24. The liquid cooling assembly according to any one of claims 14 to 23, wherein the liquid cooling member is an integrally formed flat tube plastic member.

25. The liquid cooling assembly according to any one of claims 14 to 23, wherein the plurality of liquid cooling members are composite material members.

26. The liquid cooling assembly according to claim 25, wherein the composite material member is a plastic material member.

27. The liquid cooling assembly according to any one of claims 14 to 26, wherein the liquid cooling member is an integrally formed plastic member; and / or, the thermal conductivity of the liquid cooling member is greater than 0.2 w / m / k; and / or, the elongation at break of the liquid cooling member is 30% to 180%.

28. The liquid cooling assembly according to any one of claims 14 to 27, wherein the liquid cooling member has a receiving cavity, the receiving cavity is provided with a plurality of ribs, the plurality of ribs are arranged along the width direction of the liquid cooling member and extend along the length direction of the liquid cooling member, the plurality of ribs divide the receiving cavity into a plurality of two flow channels, and the plurality of ribs are arranged in parallel along the extending direction of the liquid cooling member.

29. The liquid cooling assembly of claim 28, wherein the liquid cooling member is a liquid cooling flat tube, the ribs are respectively connected to two inner walls of the liquid cooling flat tube and are arranged at an angle with respect to any of the two inner walls of the liquid cooling flat tube, and the corner formed by the inner walls of the flow channel is chamfered.

30. The liquid cooling assembly of claim 29, wherein the angle is 35° to 55°.

31. A battery module comprising the liquid cooling assembly of any one of claims 1 to 30.

32. A battery module comprising a plurality of battery cells, a bottom liquid cooling plate arranged at the bottom of the plurality of battery cells, and the liquid cooling assembly of any one of claims 1 to 13, wherein each of the battery cells of the plurality of battery cells is arranged with the liquid cooling assembly on a side of the battery cell.

33. A battery module comprising a plurality of battery cells, a bottom liquid cooling plate arranged at the bottom of the plurality of battery cells, and the liquid cooling assembly of any one of claims 14 to 30.

34. A battery pack comprising the battery module of any one of claims 31 to 33.

35. A vehicle comprising the battery module of any one of claims 31 to 33 or the battery pack of claim 34. ​ ​

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