Liquid cooling assembly, battery module, battery pack and vehicle

Abstract

The utility model relates to the field of power batteries, and discloses a liquid cooling assembly, a battery module, a battery pack and a vehicle, the liquid cooling assembly comprises a current collector and at least one liquid cooling piece, the current collector is provided with a water nozzle and is provided with at least one butt joint port, each liquid cooling piece is respectively connected with the corresponding butt joint port on the current collector in a sealing and inserting manner, and the liquid cooling piece is connected with the current collector. The liquid cooling assembly can be flexibly arranged due to the facts that the butt-joint ports formed in the current collector can be used for the liquid cooling piece to be in sealed insertion connection and the number of the butt-joint ports in the current collector can be set according to actual needs.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power battery technical field, and concretely relates to liquid cooling assembly, battery module, battery pack and vehicle. BACKGROUND

[0002] Lithium battery is currently commonly used power battery of new energy vehicle. When new energy vehicle is running, lithium battery works power supply, and a large amount of heat is generated in the process of working, if the heat cannot be dissipated, heat accumulation temperature is too high to make lithium battery burn, and lithium battery service life is also reduced.

[0003] The existing lithium battery generally adopts liquid cooling plate to take away the heat generated by lithium battery to ensure that lithium battery is in its ideal working temperature, but the existing liquid cooling plate has the following defects:

[0004] A kind of liquid cooling plate can only be fixedly installed in the position of electric core, and cooling is carried out for one position, and the installation position cannot be flexibly set. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of liquid cooling assembly, battery module, battery pack and vehicle, to solve at least one of the above technical problems.

[0006] In order to realize the above-mentioned purpose, the utility model provides a kind of liquid cooling assembly in the first aspect, wherein the liquid cooling assembly comprises:

[0007] Current collector, water nozzle is arranged on the current collector, and at least one docking port is formed;

[0008] At least one liquid cooling part, each liquid cooling part is respectively connected with the sealing plug-in connection of corresponding docking port on the current collector.

[0009] In some embodiments of the utility model, the liquid cooling part has a receiving cavity, a plurality of ribs are arranged in the receiving cavity, the plurality of ribs are arranged along the width direction of the liquid cooling part, and extend along the length direction of the liquid cooling part to divide the receiving cavity into a plurality of flow channels, and the plurality of ribs are arranged in parallel in the extension direction.

[0010] In some embodiments of the utility model, the liquid cooling part 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 is arranged at an angle with any plane inner wall of the liquid cooling flat tube, and the edge angle position formed by the inner wall of the flow channel is arranged as a chamfer.

[0011] In some embodiments of the utility model, the included angle is 35 ° ~ 55 °.

[0012] In some embodiments of the utility model, the distance between the two planar inner walls is greater than or equal to 1 mm; and / or, the thickness of the tube wall of the liquid cooling flat tube is greater than or equal to 0.3 mm; and / or, the distance between the two adjacent ribs is greater than or equal to 1 mm; and / or, the thickness of the rib is greater than or equal to 0.3 mm.

[0013] In some embodiments of the utility model, the liquid cooling part is an integrally formed flat tube composite material part.

[0014] And / or, the thermal conductivity of the liquid cooling part is greater than 0.2 w / m / k, and / or, the elongation at break of the liquid cooling part is 30% to 180%.

[0015] In some embodiments of the utility model, the thermal conductivity of the liquid cooling part is 0.6 w / m / k to 0.8 w / m / k, and / or, the elongation at break of the liquid cooling part is 40% to 60%.

[0016] In some embodiments of the utility model, the liquid cooling part is a PPO part with a thermal conductivity of 0.73 w / m / k and an elongation at break of 46%.

[0017] In some embodiments of the utility model, the current collector forms a current collection cavity, the current collection cavity is in communication with the butt joint, and the inner wall of the current collection cavity is recessed at the periphery of the butt joint to form a limiting step, the limiting step can abut against the end of the liquid cooling part inserted from the butt joint.

[0018] In some embodiments of the utility model, the depth of the limiting step is not less than 2 mm; and / or, the height of the limiting step is not less than 0.1 mm and not greater than the thickness of the plate body of the liquid cooling part; and / or, the current collector forms a hot melt layer connected with the liquid cooling part at the limiting step.

[0019] In some embodiments of the utility model, the current collector is provided with a chamfer on the butt joint; and / or, a weight reduction groove is formed on at least part of the outer circumferential surface of the current collector.

[0020] In some embodiments of the utility model, the part of the current collector connected with the liquid cooling part protrudes to form a butt joint extension part, the butt joint extension part has a butt joint hole, the butt joint hole is in communication with the current collection cavity formed by the current collector, and the end of the butt joint hole away from the current collection cavity is formed as a butt joint.

[0021] In order to achieve the above-mentioned purpose, the utility model provides a battery module in the second aspect, wherein the battery module comprises the liquid cooling assembly according to the above.

[0022] In order to achieve the above-mentioned purpose, the utility model provides a battery pack in the third aspect, wherein the battery pack comprises the battery module according to the above.

[0023] To achieve the above object, the utility model discloses a fourth aspect provides a vehicle, wherein, the vehicle includes the battery pack according to above.

[0024] Through the above technical scheme, the liquid cooling assembly, the battery module, the battery pack and the vehicle provided by the utility model embodiment have the following beneficial effects:

[0025] When using the liquid cooling assembly, the butt joint on the current collector can be sealed and plugged by the liquid cooling component, and the number of butt joints on the current collector is not limited to one, which can be set according to actual needs, so that the number of liquid cooling components 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, so that the liquid cooling assembly can be flexibly installed at different positions of the battery cell as required.

[0026] Other features and advantages of the utility model embodiment will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the utility model embodiment and constitute a part of the specification, and are used to explain the utility model embodiment together with the following specific embodiment, but do not constitute the limitation to the utility model embodiment. For ordinary skilled person in the art, other drawings can be obtained according to the structure shown in these drawings without the creative labor. In the drawings:

[0028] Figure 1 It is the disassembly schematic view of the liquid cooling assembly in an embodiment according to the utility model;

[0029] Figure 2 It is the structure schematic view of one of the embodiments of the cold plate body in the liquid cooling assembly; Figure 1

[0030] Figure 3 It is the size marking schematic view of the cold plate body in the liquid cooling assembly; Figure 2

[0031] Figure 4 It is the structure schematic view of another embodiment of the cold plate body in the liquid cooling assembly; Figure 1

[0032] Figure 5 It is the structure schematic view of one of the perspectives of the current collector in the liquid cooling assembly; Figure 1

[0033] Figure 6 It is the structure schematic view of another perspective of the current collector in the liquid cooling assembly; Figure 1

[0034] Figure 7 Figure 1 ​​​​​​A sectional view of the current collector in the current collector assembly in the first embodiment of the present application;

[0035] Figure 8 A disassembly schematic view of the liquid cooling assembly in the first embodiment of the present application;

[0036] Figure 9 A disassembly schematic view of the first current collector in the current collector assembly in the first embodiment of the present application; Figure 8

[0037] Figure 10 A disassembly schematic view of the first current collector in the current collector assembly in the first embodiment of the present application; Figure 8

[0038] Figure 11 A disassembly schematic view of the second current collector in the current collector assembly in the first embodiment of the present application; Figure 8

[0039] Figure 12 A disassembly schematic view of the second current collector in the current collector assembly in the first embodiment of the present application; Figure 8

[0040] A disassembly schematic view of the liquid cooling assembly in the first embodiment of the present application; Figure 13

[0041] A disassembly schematic view of the liquid cooling assembly in the first embodiment of the present application; Figure 14 Figure 13 A disassembly schematic view of the liquid cooling assembly in the first embodiment of the present application;

[0042] Figure 15 Figure 13 A disassembly schematic view of the current collector in the current collector assembly in the first embodiment of the present application;

[0043] Figure 16 A disassembly schematic view of the current collector in the current collector assembly in the first embodiment of the present application; Figure 13

[0044] A disassembly schematic view of the buckle body in the current collector assembly in the first embodiment of the present application; Figure 17 Figure 13 A disassembly schematic view of the buckle body in the current collector assembly in the first embodiment of the present application;

[0045] Figure 18 A disassembly schematic view of the buckle body in the current collector assembly in the first embodiment of the present application; Figure 13 DETAILED DESCRIPTION

[0046] The specific embodiments described hereinbelow are intended to be illustrative only and are not intended to limit the scope of the present application. It should be understood that many modifications, variations, and alternatives to the specific embodiments described and illustrated herein can be practiced by one having ordinary skill in the art.

[0047] The liquid cooling assembly, the battery module, the battery pack and the vehicle according to the present application are described below with reference to the accompanying drawings.

[0048] ​​​​​​​The utility model provides a kind of liquid cooling assembly, to solve a kind of liquid cooling plate can only be fixedly installed in the position of electric core, cooling is carried out to one this position, cannot flexibly set installation position, wherein, liquid cooling assembly includes at least one liquid cooling piece and current collector, at least one docking interface is formed on current collector, docking interface can be sealed and inserted for liquid cooling piece, each liquid cooling piece is respectively and the sealed insertion connection of corresponding docking interface on current collector.

[0049] When using the above liquid cooling assembly, since the docking interface formed on the current collector can be sealed and inserted for the liquid cooling piece, and the number of docking interfaces on the current collector is not limited to one, it can be set according to actual needs, so that the number of liquid cooling pieces 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, so that the liquid cooling assembly can be flexibly installed at different positions of the electric core as needed.

[0050] Optionally, the current collector is further provided with a water nozzle.

[0051] In some embodiments, the number of liquid cooling pieces is one, the number of current collectors is two, one current collector is arranged at each end of the liquid cooling piece, each current collector has one docking interface and one water nozzle, the two ends of the liquid cooling piece are respectively sealed and inserted into the insertion interface of the corresponding current collector, 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.

[0052] In some embodiments of the utility model, the number of liquid cooling pieces is multiple, and the multiple liquid cooling pieces are sequentially and spacedly arranged along the first direction; the number of current collectors is multiple, and one current collector is arranged at each end of each liquid cooling piece, and one current collector corresponds to at least one liquid cooling piece.

[0053] Optionally, the current collector is further provided with a water nozzle.

[0054] In some embodiments, the number of liquid cooling pieces is two or more, the two or more liquid cooling pieces are sequentially and spacedly arranged along the first direction, the number of current collectors is two, and one current collector is shared by the two ends of each liquid cooling piece, each current collector has a docking interface corresponding to the number of liquid cooling pieces and one water nozzle, the two ends of the liquid cooling piece are respectively sealed and inserted into the insertion interface of the current collector corresponding to the position, 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.

[0055] In some embodiments, the number of liquid cooling components is two or more, the two or more liquid cooling components are arranged in sequence 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.

[0056] Optionally, the current collector further includes two water nozzles, or no water nozzle.

[0057] In some embodiments, the number of liquid cooling components is two or more, the two or more liquid cooling components are arranged in sequence 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 the two ends of each liquid cooling component share one current collector.

[0058] In the embodiment of the utility model, the liquid cooling component of the liquid cooling assembly can be attached above the gasket, the bottom surface of the battery cell, or any side surface of the battery cell to cool the battery cell.

[0059] Specifically, the liquid cooling assembly can be placed on the gasket, the bottom of the battery cell, the side of the battery cell, or the large surface of the battery cell to cool and heat the battery cell. The following will take a group of battery cell modules as an example for illustration. A group of battery cell modules includes multiple columns of battery cells. When the liquid cooling assembly is placed on the gasket, there are two forms of arrangement along the horizontal or vertical direction. When the liquid cooling assembly is placed on the bottom of the battery cell, the number of liquid cooling assemblies can be one, two, or more. One liquid cooling assembly covers the bottom of all battery cells. Two liquid cooling assemblies are arranged on the bottom of the left and right columns of battery cells, respectively. Multiple liquid cooling assemblies are arranged one-to-one with multiple battery cells. When the liquid cooling assembly is placed on the side of the battery cell, the liquid cooling assembly can be arranged between two columns of adjacent battery cells, and the outermost side 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. Alternatively, battery cells in multiple columns that have large surfaces in the same plane can share one liquid cooling assembly.

[0060] Optionally, the liquid cooling component can be a liquid cooling round pipe, a liquid cooling flat pipe, or a liquid cooling plate, which is not limited here.

[0061] The following will be described by taking one battery cell module as an example, one battery cell module includes multiple battery cell groups, and each battery cell group includes multiple battery cells.

[0062] The liquid cooling assembly described above can make the liquid cooling components of the liquid cooling assembly be located at different positions of the battery cells in the battery cell module by setting different numbers of liquid cooling components, different numbers of current collectors, and different connection modes of the liquid cooling components and the current collectors, for example:

[0063] When the liquid cooling component is a liquid cooling round pipe or a liquid cooling flat pipe, one liquid cooling component is attached above a group of gaskets arranged in the column direction or the lateral direction in the extending mode in the column direction or the lateral direction; when the liquid cooling component is a liquid cooling round pipe or a liquid cooling flat pipe, at least one liquid cooling component is attached to the bottom surface or the side surface of each battery cell arranged in the lateral direction in the extending mode in the lateral direction, or at least one liquid cooling component is attached to the bottom surface or the side surface of one battery cell group arranged in the column direction in the extending mode in the column direction. When the liquid cooling component is a liquid cooling plate, one liquid cooling component is attached to the bottom surface of each battery cell of the entire battery cell module; when the liquid cooling component is a liquid cooling plate, one liquid cooling component is attached to the bottom surface or the side surface of each battery cell arranged in the lateral direction in the extending mode in the lateral direction, or one liquid cooling component is attached to the bottom surface or the side surface of one battery cell group arranged in the column direction in the extending mode in the column direction.

[0064] In some embodiments of the utility model, the liquid cooling component 100 has a containing cavity, at least one rib 120 is arranged in the containing cavity, the ribs 120 respectively extend along the length direction of the liquid cooling component 100, and the at least one rib 120 separates the containing cavity to form at least two flow channels 130, the flow channels 130 are used for circulating cooling medium, and the ribs 120 are used for increasing the strength of the liquid cooling component 100.

[0065] In some embodiments, as shown in Figures 1 to 3 The liquid cooling component 100 is a liquid cooling flat pipe, the ribs 120 are connected with the two inner walls of the liquid cooling flat pipe respectively, and are arranged at an angle with any inner wall of the liquid cooling flat pipe. The arrangement of the inclined ribs can enhance the absorption capacity of the liquid cooling component 100 to the expansion force of the battery cell when the liquid cooling component 100 is subjected to the expansion and extrusion of the battery cell, and the deformation of the liquid cooling component 100 can be restored after the external force disappears, so that deformation and damage are avoided, the heat dissipation effect of the battery pack is ensured, and the service life is prolonged.

[0066] In other embodiments, as shown in Figure 4 The ribs 120 are arranged perpendicularly to any inner wall of the liquid cooling flat pipe, and when the liquid cooling flat pipe 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 pipe can also be reduced, and then the cost of the liquid cooling assembly is reduced.

[0067] In some embodiments of the utility model, the number of the ribs 120 is multiple, the multiple ribs 120 are arranged along the width direction of the plane inner wall of the liquid cooling flat tube, and the multiple ribs 120 are arranged in parallel in the extension direction, so as to divide the accommodating cavity into multiple flow channels 130. By increasing the number of the ribs 120, the absorption capacity of the battery swelling force can be further enhanced.

[0068] During the charging and discharging process, the battery cell will gradually swell, if the liquid cooling plate is located between two battery cells, the swollen battery cell will press the liquid cooling plate, and the supporting ribs in the liquid cooling plate are generally arranged perpendicular to the plane inner wall of the liquid cooling plate, so that the liquid cooling plate has limited capacity to absorb the battery swelling force, and deformation and damage may occur.

[0069] In order to avoid the above phenomenon, the ribs in the liquid cooling plate can be arranged at an angle with any plane inner wall of the liquid cooling flat tube. During the charging and discharging process, the battery cell will gradually swell, if the liquid cooling plate is located between two battery cells, the swollen battery cell will press the liquid cooling plate, and the ribs in the liquid cooling plate are arranged at an angle with any plane inner wall of the liquid cooling flat tube, so that the liquid cooling member can well absorb the battery swelling force, and deformation and damage can be avoided.

[0070] In some embodiments of the utility model, the multiple ribs 120 are arranged on the plane inner wall of the liquid cooling flat tube at the same inclination angle, so as to ensure the balance of the flow capacity of the multiple flow channels 130. Specifically, the plane 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 utility model is not limited to this, 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 to the same side, the length and width of the ribs 120 can be different, so that multiple levels of impact resistance are formed, when the inclination angles of the adjacent two ribs 120 are different and are arranged to incline to the opposite directions, the flow capacity of the formed flow channel 130 can be enhanced.

[0071] In some embodiments of the utility model, the liquid cooling member 100 includes a cooling flat tube part 110 and a rib 120, the cooling flat tube part 110 circumferentially surrounds to form an accommodating cavity and has two flat plate sections 111 arranged in parallel, the rib 120 extends along the length direction of the accommodating cavity and connects the two flat plate sections 111. That is, by arranging the flat plate section 111, the liquid cooling member 100 can be conveniently adhered to the battery cell. Specifically, the flat plate section 111 can form the plane inner wall of the liquid cooling flat tube.

[0072] The metal liquid cooling plate needs to be sprayed with 0.7mm insulating paint, which is 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 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, it will deform greatly and cannot be restored after being stressed, which will affect the thermal management performance.

[0073] To avoid the above phenomenon, the liquid cooling part 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 is hit, avoiding direct transmission of energy to the pole, thereby avoiding damage to the pole of the battery cell. When deformed greatly and cannot be restored, it will not affect the thermal management performance.

[0074] In some embodiments of the present application, the liquid cooling part 100 is an integrally formed composite material part. When the liquid cooling assembly is arranged on the plate, the composite material part has insulation performance, which can eliminate the risk of high-temperature insulation failure of the liquid cooling plate compared to the liquid cooling part 100 made of metal. In particular, when the liquid cooling part 100 is placed above the explosion-proof valve of the battery cell, the liquid cooling part 100 made of a composite material part can be burned through by the high-temperature material sprayed by the explosion-proof valve when the battery cell is in thermal runaway, thereby enabling the cooling liquid in the containing cavity to be sprayed to realize spraying on the explosion-proof valve of the battery cell, thereby inhibiting heat spread. Specifically, the composite material part can be made of plastic material.

[0075] In some embodiments of the utility model, when the liquid cooling component 100 is arranged on the side of the battery cell or the ground of the battery cell, the liquid cooling component 100 can be integrally formed with the composite material and comprises the cooling flat tube part 110 and at least one rib 120. The cooling flat tube part 110 forms a containing cavity in the circumferential direction and has two flat plate segments 111 arranged in parallel. The at least one rib 120 connects the two flat plate segments 111 to divide the containing cavity into at least two flow channels 130. The rib 120 is arranged on the flat plate segment 111 at an inclined angle. Since the liquid cooling component 100 is integrally formed with the 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 when the battery cell expands and presses, and the deformation of the liquid cooling component 100 can be restored after the external force disappears, thereby avoiding deformation and damage, 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, so when the liquid cooling component is arranged on the battery sheet, the composite material has insulation performance, and compared with the liquid cooling component 100 made of metal, the risk of insulation failure of the liquid cooling plate at high temperature can be eliminated. 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 overheats, so that the cooling liquid in the containing cavity can be sprayed out to realize spraying on 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. The multiple ribs 120 are arranged in sequence along the width direction of the containing cavity to divide the containing cavity into multiple flow channels 130, and the multiple ribs 120 are arranged on the flat plate segment 111 at the same inclined angle.

[0076] It can be understood that the length direction of the containing cavity refers to the direction from the water inlet end to the water outlet end of the containing cavity, and the width direction of the containing cavity refers to the extension direction of the opening of the water inlet end or the water outlet end.

[0077] In some embodiments of the utility model, 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 of the rib 120 within the above range can enhance the absorption capacity of the battery cell expansion force and ensure 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. When the inclined angle θ is 45°, the balance of the two capacities can be ensured.

[0078] In some embodiments of the utility model, liquid cooling piece 100 is set to thermoplastic piece, and the elongation at break performance of thermoplastic material is better than that of thermosetting material, which can further enhance the absorption capacity of the expansion force of the battery cell, and specifically, PA12, PPA, PPS, PPO and other thermoplastic materials suitable for integrated extrusion process can be used, and the integrated extrusion molding using thermoplastic material does not have special requirements for length size, and the manufacturing process of the above-mentioned liquid cooling piece 100 is particularly suitable for long liquid cooling piece 100. Of course, the utility model is not limited to this, and the liquid cooling piece 100 can also be set to a thermosetting piece, and specifically, HCMC and other thermosetting materials suitable for integrated injection molding process can be used, and the liquid cooling piece 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 piece 100 of the thermosetting piece can be selected to improve the cooling effect.

[0079] In some embodiments of the utility model, the thermal conductivity of the liquid cooling piece 100 is greater than 0.2 w / m / k, so as to limit the thermal conductivity of the liquid cooling piece 100 to ensure the thermal conductivity of the liquid cooling piece 100. Specifically, the thermal conductivity of the liquid cooling piece 100 can also be set to 0.2 w / m / k-30 w / m / k, and by further limiting the upper limit value, production can be carried out within a reasonable production process requirement range. In addition, the elongation at break of the liquid cooling piece 100 can be greater than 0.2%, and more specifically 30%-180%, so as to limit the elongation at break of the liquid cooling piece 100, which can not only ensure the absorption capacity of the liquid cooling piece 100 to the expansion force of the battery cell, but also avoid the fracture of the liquid cooling piece 100 during the air pressure test.

[0080] In some embodiments of the utility model, the thermal conductivity of the liquid cooling piece 100 is 0.6 w / m / k-0.8 w / m / k, and the elongation at break of the liquid cooling piece 100 is 40%-60%. It is found that the thermal conductivity and the elongation at break of the liquid cooling piece 100 are inversely changed during material selection, that is, the higher the elongation at break index, the lower the thermal conductivity index. After persistent deduction and analysis by the utility model person, it can be determined that the liquid cooling piece 100 in the above index range can not only ensure excellent thermal conductivity, but also meet the demand of absorbing the expansion force of the battery cell.

[0081] Specifically, the thermal conductivity of the liquid cooling piece 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 piece 100 can be a PPO piece with a thermal conductivity of 0.73 w / m / k and an elongation at break of 46%.

[0082] In some embodiments of the utility model, the distance L3 between the two flat plate segments 111 is not less than 1 mm, and the thickness L2 of the flat plate segment 111 is not less than 0.3 mm; and / or, the distance L1 between the two adjacent rib strips 120 is not less than 1 mm, and the thickness of the rib strip 120 is not less than 0.3 mm. The above parameters can facilitate the production of the liquid cooling piece 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 piece 100.

[0083] Specifically, 1mm≤L1≤10mm, when L1=1mm, the liquid cooling piece 100 is filled with 205Kpa, the plate surface is less likely to be raised, and the risk of disconnection at the connection position with the opponent piece (the battery cell cooled or heated by the liquid cooling piece 100) is small; when L1=10mm, the extrusion mold strength becomes larger, and the processing is easier; when L1=3 or 5mm, the deformation of the liquid cooling piece 100 when filled with gas can be controlled, and the ease of processing can also be considered.

[0084] When 0.3mm≤L2≤5mm, L1=0.3mm, the wall thickness is small, the weight is light, the thermal resistance is small, and the thermal conductivity is better; when L2=5mm, the wall thickness is large, and when the liquid cooling piece 100 is filled with 205Kpa, the plate surface is less likely to be raised, and the risk of disconnection at the connection position with the opponent piece is small; when L2=0.5 or 1mm, the weight, thermal resistance, and the amount of swelling when the cold plate is filled with gas can be considered.

[0085] When 1mm≤L3≤10mm, L3=1mm, the space occupied by the battery pack is small; when L3=10mm, the extrusion mold strength becomes larger, and the processing is easier; when L3=3mm or 5mm, the space occupied by the battery pack can be controlled, and the ease of processing can also be considered.

[0086] In some embodiments of the utility model, the corner position formed by the inner wall of flow channel 130 is set as a rounded corner, and the addition of the rounded corner can avoid stress concentration at the corner position, disperse stress and avoid the occurrence of cracking. Specifically, the rounded corner radius is set to be greater than 0.1 mm, which can be 0.2 mm, 0.5 mm, etc. Specifically, the cross section of flow channel 130 can be set as a triangle and a quadrilateral, and in particular when the two adjacent rib strips 120 are arranged on the side wall of the liquid cooling piece 100 at the same inclination angle for adhesion with the battery cell, the cross section of the flow channel 130 between the two adjacent rib strips 120 can be set as a parallelogram.

[0087] Please refer again to Figure 2 In some embodiments of the utility model, the cooling flat tube part 110 further includes a first arc plate segment 112 and a second arc plate segment 113, one of the flat plate segments 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 set as outwardly convex arc plates. Specifically, the thickness of the two flat plate segments 111, the first arc plate segment 112 and the second arc plate segment 113 is set to be consistent.

[0088] See Figure 1 And Figures 5 to 7 In some embodiments of the utility model, 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 along the circumference of the butt joint 211, and 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, and 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.

[0089] In some embodiments of the utility model, the depth of the limiting step 212 is not less than 2mm to ensure the connecting strength of the liquid cooling component 100 and the current collector 200, and / or the height of the limiting step 212 is not less than 0.1mm and not more than the thickness of the plate body of the liquid cooling component 100 to ensure the smoothness of the cooling liquid flow channel while playing a limiting role, and the height of the limiting step 212 is too small to play a good limiting role, but the height exceeds the thickness of the plate body of the liquid cooling component 100, which will affect the overall flow resistance. Specifically, 0.1mm≤the height of the limiting step 212≤the thickness of the plate body, the limiting step height = 0.1mm, 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 better; the height of the limiting step 212 is the intermediate value of 0.1mm and the thickness of the plate body, which can control the material and weight, and also consider the machining precision and limiting effect.

[0090] In some embodiments of the utility model, the current collector 200 is formed with a hot melt layer connected with the liquid cooling component 100 at the limiting step 212. The addition of the hot melt layer can ensure the connecting strength. Further, the liquid cooling component 100 and the current collector 200 can be welded by a hot melt method, such as laser welding, ultrasonic welding, etc., and of course can also be connected by adhesive or connected by a buckle form.

[0091] In some embodiments of the utility model, 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, the addition of the chamfer 213 structure facilitates the assembly of the liquid cooling component 100 and the current collector 200, and the chamfer 213 is recommended to be not less than 0.1mm, and the chamfer 213 is too small to play a role in assembly guiding.

[0092] In some embodiments of the utility model, the current collector 200 includes a current collecting flat tube part 210 and a water nozzle 220, the current collecting flat tube part 210 forms a current collecting cavity 215 with a butt joint 211, and the water nozzle 220 is arranged on the outer side of the current collecting flat tube part 210 and communicates with the current collecting cavity 215. The arrangement of the current collecting flat tube part 210 can facilitate the plug-in sealing with the cooling flat tube part 110.

[0093] Specifically, in some embodiments of this utility model, the collector 200 includes a collecting flat tube section 210 and a water nozzle 220. The collecting flat tube section 210 forms a collecting cavity 215 with a connecting interface 211. The water nozzle 220 is located on the outside of the collecting flat tube section 210 and communicates with the collecting cavity 215. The inner wall of the collecting cavity 215 is recessed at the periphery of the connecting interface 211 to form a limiting step 212. The limiting step 212 can abut against the cooling flat tube section 110 inserted from the connecting interface 211. The opening of the connecting interface 211 facilitates the insertion of the cooling flat tube section 110 and the collecting flat tube section 210. At the same time, the addition of the limiting step 212 can restrict the insertion position of the cooling flat tube section 110 to ensure the communication between the flow channel 130 in the cooling flat tube section 110 and the collecting cavity 215.

[0094] In some embodiments of this utility model, the collector 200 is designed as an integral injection molded part, that is, the water nozzle 220 and the collector flat tube 210 are integrally formed and do not require assembly connection. The water inlet and outlet directions of the water nozzle 220 can be flexibly designed according to the requirements. In addition to the traditional 90°, the angle with the surface of the collector 200 can also be 45° / 135°, 0° / 180°, etc.

[0095] like Figure 6 As shown, in some embodiments of this utility model, at least a portion of the outer peripheral surface of the collector 200 is provided with a weight-reducing groove 214. For example, the weight-reducing groove 214 may be provided on the side of the collector 200 away from the water nozzle 220, or it may be on the peripheral surface other than the connection position of the water nozzle 220, in order to achieve the purpose of product weight reduction. It is recommended that the depth of the weight-reducing groove 214 not exceed 0.8 times the wall thickness of the collector 200 to avoid the collector 200 itself having too low strength.

[0096] The collectors at the same end of multiple liquid cooling plates are usually set up separately, and there is no connecting support between the separate collectors, which makes them prone to bending and deformation during transportation.

[0097] To avoid the above phenomenon, the collector has a number of interfaces that match the number of liquid cooling components. The first ends of the multiple liquid cooling components can be inserted into the multiple interfaces of the collector one by one, which significantly improves the rigidity of the liquid cooling components and avoids bending and deformation during transportation.

[0098] like Figures 8 to 12 As shown, in some embodiments of this utility model, there are multiple liquid cooling components 300, and the multiple liquid cooling components 300 are arranged sequentially at intervals along the first direction; the first collector 410 is formed with multiple first pairs of interfaces at intervals along the first direction, and the multiple first pairs of interfaces can be used to seal and plug in the first ends of the multiple liquid cooling components 300 one by one.

[0099] When the liquid cooling assembly is used, since the first manifold 410 is formed with the first mating interfaces consistent with the number of the liquid cooling pieces 300, and the first ends of the plurality of liquid cooling pieces 300 can be inserted into the plurality of first mating interfaces of the first manifold 410 one by one, compared with the manifold of each end of the liquid cooling piece 300 being provided as at least two split manifolds, the rigidity of the liquid cooling assembly in the utility model is improved, and the phenomenon of bending and deformation in the transfer process is avoided.

[0100] In some embodiments of the utility model, the liquid cooling assembly further comprises a second manifold 420, the second manifold 420 is sequentially and spacedly formed with a plurality of second mating interfaces along a second direction, and the plurality of second mating interfaces can be used for sealing and inserting the second ends of the plurality of liquid cooling pieces 300 one by one. The second manifold 420 can be added, so that the second ends of the plurality of liquid cooling pieces 300 can be inserted into the plurality of second mating interfaces of the second manifold 420 one by one.

[0101] In some embodiments of the utility model, the number of the liquid cooling pieces 300 is a plurality, the plurality of liquid cooling pieces 300 are sequentially and spacedly arranged along a first direction, the number of the manifold is two and is provided as the first manifold 410 and the second manifold 420, both ends of the plurality of liquid cooling pieces 300 are respectively provided with a manifold, and the manifold is formed with a mating interface for sealing and inserting the plurality of liquid cooling pieces 300. Thus, compared with the manifold of each end of the liquid cooling piece 300 being provided as at least two split manifolds, the rigidity of the liquid cooling assembly in the utility model is further improved.

[0102] In some embodiments of the utility model, the first manifold 410 and / or the second manifold 420 are formed with a manifold cavity 430 extending along the first direction, the plurality of first mating interfaces are arranged in communication with the manifold cavity 430 of the first manifold 410, and the plurality of second mating interfaces are arranged in communication with the manifold cavity 430 of the second manifold 420, so that the manifold cavity 430 of the first manifold 410, the manifold of the second manifold 420 and the containing cavity of the plurality of liquid cooling pieces 300 are arranged in communication, so as to improve the flow rate of the cooling liquid.

[0103] In some embodiments of the utility model, the part of the first manifold 410 and / or the second manifold 420 connected with the liquid cooling piece is formed with a mating extension part 433, the mating extension part 433 has a mating hole, the mating hole is in communication with the manifold cavity, the end of the mating hole away from the manifold cavity is formed with a corresponding mating interface, and the end of the liquid cooling piece 300 is inserted into the mating hole from the mating interface. Then, by adding the mating extension part 433, the insertion strength of the liquid cooling piece 300 can be improved, and the insertion of the liquid cooling piece 300 can not block the flow of the liquid in the manifold cavity 430, so as to ensure that the liquid has enough flow space.

[0104] Specifically, the number of the docking extension portions 433 on the first current collector 410 and / or the second current collector 420 can be multiple, the multiple docking extension portions 433 are sequentially and spaced apart in the first direction of the first current collector 410 and / or the second current collector 420, and the multiple docking extension portions 433 are each formed with a docking hole communicated with the corresponding current collection cavity 430, and the outer end of the docking hole is provided as a corresponding docking port, and the end of the liquid cooling piece 300 extends into the docking hole for plugging.

[0105] In some embodiments of the present application, the inner wall of the current collection cavity 430 is further recessed to form a limiting step 434 at the periphery of the first docking port or the second docking port, and the limiting step 434 can abut against the end of the liquid cooling piece 300 inserted from the corresponding docking port. The limiting step 434 can limit the plugging position of the liquid cooling piece 300 to ensure the communication between the accommodating cavity of the liquid cooling piece 300 and the current collection cavity 430. Specifically, the limiting step 434 is formed on the inner wall of the docking hole.

[0106] In some embodiments of the present application, the depth of the limiting step 434 is not less than 2mm to ensure the connection strength of the liquid cooling piece 300 and the current collector; and / or, the height of the limiting step 434 is not less than 0.1mm and not more than the thickness of the plate body of the liquid cooling piece 300 to ensure the smoothness of the cooling liquid flow channel while playing a limiting role, and the height of the limiting step 434 is too small to play a good limiting role, but the height exceeds the thickness of the plate body of the liquid cooling piece 300, which will affect the overall flow resistance. Specifically, 0.1mm≤height of the limiting step 434≤thickness of the plate body, limiting step height=0.1mm, 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 0.1mm 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.

[0107] In some embodiments of the utility model, first current collector 410 and / or second current collector 420 all include injection molded main part 431 and sealing cover plate part 432, injection molded main part 431 is set to integrally injection molded and forms current collecting cavity 430 and corresponding interface, and injection molded main part 431 also forms injection molding process port communicated with current collecting cavity 430, sealing cover plate part 432 is used to cover injection molding process port and is connected with injection molded main part 431. That is, first current collector 410 and second current collector 420 are first produced by split production process, injection molded main part 431 has current collecting cavity 430 and interface by integral injection molding process, and in order to facilitate mold design and injection cavity demolding, injection molded main part 431 can also be designed with injection molding process port communicated with current collecting cavity 430, and then subsequent sealing of injection molding process port needs to produce sealing cover plate part 432 additionally, sealing cover plate part 432 can also be set to be made by injection molding process, sealing cover plate part 432 is then covered on injection molding process port, and hot melt welding process can be used to connect injection molded main part 431 and sealing cover plate part 432 to form first hot melt layer, so that the reliability of the connection of both can be guaranteed, and hot melt welding can use, for example, laser welding, ultrasonic welding and the like. Of course, the utility model is not limited to this, injection molded main part 431 and sealing cover plate part 432 can also be bonded by adhesive layer, and first current collector 410 and second current collector 420 are not limited to injection molding process, and can also be CNC process.

[0108] Specifically, the interface is formed on the inner side of injection molded main part 431, and it needs to be particularly pointed out that the inner and outer sides in the utility model are defined based on liquid cooling piece 300, the side facing liquid cooling piece 300 is defined as the inner side, and the side away from liquid cooling piece 300 is defined as the outer side, and the injection molding process port is formed on the side adjacent to the interface on injection molded main part 431.

[0109] More specifically, first current collector 410 and second current collector 420 can be suitable for plastic parts of injection molding process, in particular, thermoplastic parts, such as PA12, PPA, PPS, PPO and the like, and the utility model is not limited to this, and it is also possible that first current collector 410 and second current collector 420 are set as thermosetting parts.

[0110] In some embodiments of the utility model, the one side of sealing cover plate part 432 faces injection molding main part 431 is formed with inlay ring part 436, inlay ring part 436 stretches into injection molding process mouth and is set with the inner wall of injection molding process mouth, so that before heat melting welding of sealing cover plate part 432 and injection molding main part 431, inlay ring part 436 can be used to preposition sealing cover plate part 432, to guarantee the subsequent connecting effect. Specifically, injection molding process mouth can be square, sealing cover plate part 432 and inlay ring part 436 are set as square cooperation, and the part of sealing cover plate part 432 on the outside of inlay ring part 436 can be heat melting welded with the circumference of injection molding process mouth.

[0111] In some embodiments of the utility model, the number of inlay ring part 436 on sealing cover plate part 432 is set to at least two, and the at least two inlay ring parts 436 are sequentially and spacedly arranged along the length direction (that is, the first direction) of sealing cover plate part 432, to play the role of resisting deformation and improving the strength of sealing cover plate part 432.

[0112] In some embodiments of the utility model, the light absorption rate of injection molding main part 431 is set to not less than 95%, and the light transmittance of sealing cover plate part 432 is set to 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 injection molding main part 431 and the light transmittance of sealing cover plate part 432, the connection strength of welding can be guaranteed.

[0113] Further, under normal temperature environment, the liquid cooling assembly is connected to the pressure system, filled with cooling liquid, all air is discharged, pressure is applied to 4bar at a rate of 1.2MPa / min first, kept for 1min, then pressure is applied at a rate of 0.075~0.175MPa / s, until some part of the liquid cooling assembly appears failure phenomenon such as leakage, burst, stop pressurizing, and the specific test results are shown in the following table:

[0114]

[0115] In some embodiments of the utility model, still integrative injection molding has liquid inlet nozzle 411, liquid outlet nozzle 412 and positioning pin 440 on injection main part 431. Liquid nozzle and positioning pin 440 are integrally formed on injection main part 431, thereby not only saving assembly steps, but also enhancing the sealing of liquid nozzle and the position accuracy of positioning pin 440. Specifically, integrative injection molding has liquid inlet nozzle 411, liquid outlet nozzle 412 and positioning pin 440 on injection main part 431 of first current collector 410, integrative injection molding has positioning pin 440 on injection main part 431 of second current collector 420, of course, the utility model is not limited to this, and first current collector 410 can be integrative injection molding with liquid inlet nozzle 411 and positioning pin 440 on injection main part 431, and second current collector 420 can be integrative injection molding with liquid outlet nozzle 412 and positioning pin 440 on injection main part 431, and the box of battery is provided with positioning hole for positioning pin 440.

[0116] In some embodiments of the utility model, when liquid inlet nozzle 411 and liquid outlet nozzle 412 are provided on first current collector 410, two kinds of current collecting cavities 430 exist on first current collector 410, the two kinds of current collecting cavities 430 on first current collector 410 can be liquid inlet current collecting cavity and liquid outlet current collecting cavity, liquid inlet current collecting cavity and liquid outlet current collecting cavity are sequentially and spaced apart along the first direction of first current collector 410, and liquid inlet nozzle 411 and liquid outlet nozzle 412 are provided to be respectively communicated with liquid inlet current collecting cavity and liquid outlet current collecting cavity one by one, liquid inlet current collecting cavity and liquid outlet current collecting cavity on first current collector 410 are provided with at least one first connecting port correspondingly, so that liquid inlet current collecting cavity and liquid outlet current collecting cavity are connected with at least one liquid cooling piece 300, and each current collecting cavity 430 on second current collector 420 is provided with at least two second connecting ports correspondingly, so that each current collecting cavity 430 of second current collector 420 is connected with at least two liquid cooling pieces 300, and in at least two liquid cooling pieces 300 connected with each current collecting cavity 430 of second current collector 420, at least one liquid cooling piece 300 is provided with liquid inlet current collecting cavity, and at least one liquid cooling piece 300 is provided with liquid outlet current collecting cavity.

[0117] 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 middle one current collecting cavity 430 belongs to the other one of the liquid inlet current collecting cavity and the liquid outlet current collecting cavity, and 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 middle one current collecting cavity 430; 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.

[0118] In some embodiments of the utility model, 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.

[0119] In some embodiments of the utility model, a plurality of reinforcing ribs are arranged in the weight reduction cavity, and the reinforcing ribs can improve the strength and resistance to deformation.

[0120] In some embodiments of the utility model, 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.

[0121] In some embodiments of the utility model, 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 butt joint 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 butt joint formed by the second current collector 420. That is, after the two ends of the liquid cooling piece 300 are respectively inserted into the first butt joint and the second butt joint, they can also be connected by hot melt welding to further ensure the stability and strength of the connection. Of course, the utility model is not limited to this, 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.

[0122] In some embodiments of the utility model, there are two manufacturing schemes of the liquid cooling assembly.

[0123] 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 light absorption rate of the material is required to be greater than or equal to 95%. The injection molding main part 431 is made by injection molding or CNC process, and the injection molding main 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 material is required to be greater than or equal to 20%. Then, the sealing cover plate part 432 and the injection molding main part 431 are welded by hot melting, such as laser welding, ultrasonic welding, or adhesive connection. 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 part 431 by hot melting. In the second manufacturing scheme, the liquid cooling component 300 is first made by extrusion or injection molding process, then the cold plate and the injection molding main part 431 of the first current collector 410 and the second current collector 420 are connected by injection molding, and finally the sealing cover plate part 432 and the injection molding main part 431 are welded by hot melting.

[0124] 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, surface treatment method of the bonded surface, etc. of the liquid cooling plate and the current collector need to be controlled, and any problem may cause the sealing failure of the connection position.

[0125] To avoid the above phenomenon, the end of the liquid cooling component is connected 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 the current collector can be buckled with the buckle body after the buckle body is sealed and inserted into the current collecting cavity. The connection strength is obviously improved, and the cooling liquid resistance of the adhesive layer and the aging of the adhesive layer do not need to be considered.

[0126] As shown in Figures 13 to 18 In some embodiments of the present application, the liquid cooling assembly further comprises a buckle body 600, the buckle body 600 is connected with the end of the liquid cooling component 500, and the docking port of the current collector 700 can be sealed and inserted into the buckle.

[0127] When the liquid cooling assembly is used, the end of the liquid cooling piece 500 is butted against the buckle body 600, and the butt joint of the collecting cavity 711 can be sealed and inserted into the buckle body 600 for clamping, so that after the buckle body 600 is sealed and inserted into the collecting cavity 711, the collector 700 can be clamped and connected with the buckle body 600, and the connection strength is obviously improved compared with the connection strength of using glue to bond the liquid cooling piece 500 and the collector 700. At the same time, it is not necessary to consider the cooling liquid performance of the glue layer and the aging of the glue layer.

[0128] In some embodiments of the utility model, the collector 700 forms a collecting cavity with a butt joint, the first clamping structure for clamping and connecting with the buckle body 600 is arranged on the peripheral wall of the collecting cavity 711, and the buckle body 600 is sleeved on the outside of the end of the liquid cooling piece 500 and is formed with the second clamping structure for clamping and connecting with the first clamping structure. The buckle body 600 is arranged to be sleeved on the outside of the liquid cooling piece 500, and the collector 700 is sleeved on the outside of the buckle body 600. This connection mode of nesting from the inside to the outside can guarantee the sealing performance and improve the connection strength. Of course, the utility model is not limited to this, and the end of the buckle body 600 can be butted against the end of the liquid cooling piece 500.

[0129] Specifically, the number of the first clamping structure and the second clamping structure is multiple, the multiple second clamping structures are arranged in sequence and at intervals along the circumference of the buckle body 600, and the multiple first clamping structures are arranged in one-to-one correspondence with the multiple second clamping structures on the peripheral wall of the collecting cavity 711.

[0130] In some embodiments of the utility model, the second clamping structure is arranged as a boss part 610 protruding on the outside of the buckle body 600, and the first clamping structure is arranged as a clamping hole 712, and the boss part 610 can be inserted into the clamping hole 712 for clamping and connecting. The boss part 610 is arranged on the outside of the buckle body 600, which can facilitate the production and manufacturing of the buckle body 600 and guarantee the stability of the buckle. Specifically, the clamping hole 712 can be arranged as a through hole to facilitate the observation of whether the buckle is clamped in place. Of course, the utility model is not limited to this, and the second clamping structure is arranged as a clamping hole 712, and the first clamping structure is arranged as a boss part 610 protruding on the inner wall of the collecting cavity 711.

[0131] In some embodiments of the utility model, liquid cooling assembly still includes sealing piece 800, sealing piece 800 is placed between the outer end of buckle body 600 and the inner wall of current collecting cavity 711. Through the addition of sealing piece 800, the sealing property of the outer end of buckle body 600 inserted in current collecting cavity 711 can be guaranteed. It needs to be specially pointed out that the outer end of buckle body 600 is defined relative to liquid cooling piece 500, and the end set towards the outside of liquid cooling piece 500 can be defined as the outer end. In addition, the buckle structure provided as boss portion 610 can also become sealing piece 800, for example: buckle body 600 is provided as a workpiece with sealing property, and the second buckle structure on buckle body 600 is provided as boss portion 610 set outwards, and boss portion 610 is set in a circle along the circumference of buckle body 600, correspondingly, the buckle hole 712 formed on the circumferential wall of current collecting cavity 711 as the first buckle structure can also be set in a circle, then when boss portion 610 is buckled in buckle hole 712, not only buckle connection can be realized, but also the whole circle sealing of boss portion 610 to buckle connection can be realized, at this time, the buckle hole 712 on the circumferential wall of current collecting cavity 711 can be provided as a blind hole.

[0132] In some embodiments of the utility model, sealing groove 713 for containing sealing piece 800 is formed on the inner wall of current collecting cavity 711 opposite to the outer end of buckle body 600. The addition of sealing groove 713 can facilitate the pre-limiting of sealing piece 800, so as to guarantee the stability of sealing piece 800 in the subsequent butt joint assembly process of buckle body 600 and current collector 700. Further, groove plate portion 714 can be formed on the inner wall of current collecting cavity 711 opposite to the outer end of buckle body 600, groove plate portion 714 is arranged opposite to the circumferential wall of current collecting cavity 711 formed with the first buckle structure, so as to form sealing groove 713, that is, when sealing piece 800 is placed in sealing groove 713, the circumferential wall of current collecting cavity 711 formed with the first buckle structure can stop sealing piece 800 from the outside, and groove plate portion 714 can stop sealing piece 800 from the inside.

[0133] In some embodiments of the utility model, the compression ratio of sealing piece 800 is 10%~40%, and the filling rate range is 40%~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 in a long time of strong compression, leading to sealing failure, so limiting both within a suitable range can not only ensure excellent sealing property, but also prolong service life. Further, under normal temperature, by introducing air pressure of 205KPa±5KPa into the liquid cooling assembly, stabilizing for 120s, testing for 60s, the leakage rate is less than 0.5cc / min or the helium detection leakage amount is less than 1*10-6Pa*m3 / s, and the specific test results are shown in the following table.

[0134]

[0135] 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.

[0136] 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 collection 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 forms the current collection 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.

[0137] In some embodiments of the present application, the outer side of the boss portion 610 is inclined upward 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 collection cavity 711 gradually expands until the buckle hole 712 is buckled 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 inclined upward from the buckle body 600 in the direction of buckling the buckle hole 712 into the boss portion 610.

[0138] 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 will cause assembly difficulty 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~2mm. If L2 is too small, it will cause insufficient tightness with the buckle hole 712, and if L2 is too large, it will cause assembly difficulty with the current collector 700.

[0139] In some embodiments of the utility model, buckle body 600 includes buckle main part 620 and end limit part 630, buckle main part 620 is formed with the sleeve joint hole that the end of liquid cooling spare 500 passes, and buckle main part 620 is equipped with second buckle structure, specifically can be the boss part 610 of protruding on the outside of buckle main part 620, end limit part 630 is located the outer end of buckle main part 620 and is set up from the circumferential edge of sleeve joint hole and reach the axle end of liquid cooling spare 500 and abut, so that the end of sleeve joint can be positioned, further improve the connection strength. Specifically, the thickness L3 size of end limit part 630 is recommended to be greater than or equal to 0.1mm, and too small thickness will result in insufficient strength of end limit part 630. At the same time, the size of the first guide fillet R on the buckle body 600 is recommended to be greater than or equal to 0.1mm, and the size of the second guide fillet 715 on the current collector 700 is also recommended to be greater than or equal to 0.1mm. Too small size will not play a guiding role.

[0140] In some embodiments of the utility model, the liquid cooling member 500 is made of metal or plastic, and the buckle body 600 is made of plastic, and the liquid cooling member 500 and the buckle body 600 are connected by injection molding, thereby improving the connection strength. Specifically, the liquid cooling member 500 can be made of metal, such as 3-series or 6-series aluminum alloy, which is made by extrusion work, or made of plastic material, such as PPA or PPS, which is made by extrusion process. The buckle body 600 can be made of plastic material, such as PPA or PPS, and glass fiber can also be added to the material to enhance the structural strength, but the content of glass fiber should not exceed 45%, otherwise the hardness of the material itself will be too strong 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 or other processes. In addition, the connection mode of the liquid cooling member 500 and the buckle body 600 is preferably injection molding, and can be selected as glue or welding process.

[0141] In some embodiments of the utility model, an injection molding layer can be formed between the liquid cooling member 500 and the buckle body 600, and the thickness L1 of the buckle main part 620 is not less than 2mm. Too short distance will result in low connection position strength, so by limiting the thickness size of the buckle main part 620, the connection strength can be ensured. Specifically, during the design test of the thickness L1 of the buckle main part, the following data can be obtained: when L1=2mm, the pull-off force between the liquid cooling member 500 and the buckle body 600 at room temperature is 300N, which can meet the daily use; when L1=4mm, the pull-off force between the liquid cooling member 500 and the buckle body 600 at room temperature is 600N; when L1=6mm, the pull-off force between the liquid cooling member 500 and the buckle body 600 at room temperature is 900N.

[0142] In some embodiments of the utility model, the current collector 700 is made of metal or plastic. Specifically, the material of the current collector 700 can be metal, such as 3 series or 6 series aluminum alloy, which is made by CNC and casting process, or plastic material, such as PPA, PPS, etc., and glass fiber can also 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 difficult processing. The current collector 700 is made of one-piece injection molding, 3D printing and other processes.

[0143] The utility model provides a kind of liquid cooling assembly, wherein, liquid cooling assembly includes:

[0144] Current collector, at least one docking interface is formed on current collector;

[0145] At least one liquid cooling piece, each liquid cooling piece is respectively connected with the sealing plug-in connection of corresponding docking interface on current collector.

[0146] In some embodiments of the utility model, the liquid cooling piece has a receiving cavity, at least one rib is provided in the receiving cavity, the ribs extend along the length direction of the liquid cooling piece respectively, and the at least one rib separates the receiving cavity to form at least two flow channels.

[0147] In some embodiments of the utility model, the liquid cooling piece is a liquid cooling flat tube, the ribs are connected with the inner walls of the two planes of the liquid cooling flat tube respectively, and any plane inner wall of the liquid cooling flat tube is inclinedly arranged at an included angle.

[0148] In some embodiments of the utility model, the number of ribs is multiple, the multiple ribs are arranged at intervals along the width direction of the plane inner wall, and the multiple ribs are arranged in parallel in the extension direction thereof.

[0149] In some embodiments of the utility model, the included angle is 35°-55°.

[0150] In some embodiments of the utility model, the liquid cooling piece is made of a one-piece composite material;

[0151] And / or, the thermal conductivity of the liquid cooling piece is greater than 0.2 w / m / k;

[0152] And / or, the elongation at break of the liquid cooling piece is 30%-180%.

[0153] In some embodiments of the utility model, the current collector has a current collecting cavity, the current collector is communicated with the docking interface, a limiting step is formed on the inner wall at the periphery of the docking interface, and the limiting step abuts against the liquid cooling piece inserted from the docking interface.

[0154] In some embodiments of the utility model, the liquid cooling assembly includes

[0155] A plurality of liquid cooling components are arranged in sequence along a first direction;

[0156] A plurality of current collectors are arranged in sequence along the first direction, and each of the liquid cooling components is provided with one current collector at each end.

[0157] In some embodiments of the utility model, the number of liquid cooling components is multiple, and the plurality of liquid cooling components are arranged in sequence along a first direction; the number of current collectors is multiple, and each liquid cooling component is provided with one current collector at each end, and one current collector corresponds to at least one liquid cooling component.

[0158] In some embodiments of the utility model, the part where the current collector is connected with the liquid cooling plate is protruded to form a docking extension part, the docking extension part has a docking hole, the docking hole is communicated with the current collecting cavity, and the end of the docking hole away from the current collecting cavity is formed as a docking port.

[0159] In some embodiments of the utility model, a weight reduction groove is formed on at least part of the outer circumferential surface of the current collector.

[0160] In some embodiments of the utility model, the current collector comprises 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.

[0161] In some embodiments of the utility model, a plurality of reinforcing ribs are arranged in the weight reduction cavity.

[0162] In some embodiments of the utility model, the current collector comprises an injection molded main body part and a sealing cover plate part, the injection molded main body part is integrally injection molded to form the current collecting cavity and the docking port, and an injection molding process hole is further formed on the injection molded main body part and communicated with the current collecting cavity, the sealing cover plate part is sealingly connected with the injection molded main body part, and the orthographic projection of the side of the sealing cover plate part close to the injection molded main body part covers the injection molding process hole.

[0163] In some embodiments of the utility model, the light transmittance of the sealing cover plate part is not less than 20%, and the light absorption rate of the injection molded main body part is not less than 95%.

[0164] In some embodiments of the utility model, the liquid cooling assembly further comprises a buckle body, the buckle body is sealingly sleeved on the end of the liquid cooling component, and the docking port of the current collector can sealingly insert the buckle body.

[0165] In some embodiments of the utility model, the docking port of the current collector is formed with a current collecting cavity, a first clamping structure is arranged on the peripheral wall of the current collecting cavity, a second clamping structure is arranged on the buckle body, and the first clamping structure is clamped with the second clamping structure.

[0166] In some embodiments of the utility model, second buckle structure is set to boss part which is set on the outside of buckle body, first buckle structure is set to buckle hole, boss part can extend into buckle hole and buckle connection.

[0167] In some embodiments of the utility model, the liquid cooling assembly further comprises a sealing member disposed between the outer end of the buckle body and the inner wall of the collecting cavity.

[0168] In some embodiments of the utility model, the compression ratio of the sealing member is set to 10%~40%, and the filling rate range is set to 40%~110%.

[0169] In some embodiments of the utility model, the buckle body comprises a buckle main body part and an end limiting part, the buckle main body part is formed with a sleeve joint 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 buckle main body part and is radially arranged outward from the periphery of the sleeve joint hole to abut against the shaft end of the liquid cooling member.

[0170] In addition, the utility model 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.

[0171] In addition, the utility model 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.

[0172] In addition, the utility model 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.

[0173] In the description of the utility model, 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 indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0174] In the utility model, unless another definite provision and limit, the term " install " " link " " connect " " fixed " and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection or each other can communicate;Can be direct link, also can pass through intermediate medium indirectly link, can be two element inside's intercommunication or two element's interaction relation, unless another definite limit.For the ordinary skill of the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0175] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction 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 one or more embodiments or examples in a suitable manner. 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.

[0176] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and the ordinary skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A liquid-cooled assembly, comprising: The liquid cooling assembly comprises: a current collector provided with a water nozzle and formed with at least one mating interface; at least one liquid cooling component, each of which is in sealing plug-in connection with a corresponding mating interface on the current collector; the liquid cooling component 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 component and extend along the length direction of the liquid cooling component, so as to separate the containing cavity to form a plurality of flow channels, and the plurality of ribs are arranged in parallel in the extending direction.

2. The liquid-cooling assembly of claim 1, wherein, The liquid cooling component is a liquid cooling flat tube, the ribs are connected with two inner walls of the liquid cooling flat tube respectively, and are arranged at an included angle with any one of the inner walls of the liquid cooling flat tube, and the inner wall of the flow channel is arranged at an angle position in the form of a chamfer.

3. The liquid-cooling assembly of claim 2, wherein, The included angle is 35°-55°.

4. The liquid-cooling assembly of claim 2, wherein, The distance between the two inner walls is greater than or equal to 1 mm; and / or, the thickness of the tube wall of the liquid cooling flat tube is greater than or equal to 0.3 mm; and / or, the distance between two adjacent ribs is greater than or equal to 1 mm; and / or, the thickness of the rib is greater than or equal to 0.3 mm.

5. The liquid-cooling assembly of claim 1, wherein, The liquid cooling component is an integrally formed flat tube composite material component; and / or, the thermal conductivity of the liquid cooling component is greater than 0.2 w / m / k, and / or, the elongation at break of the liquid cooling component is 30%-180%.

6. The liquid-cooling assembly of claim 1, wherein, The thermal conductivity of the liquid cooling component is 0.6 w / m / k-0.8 w / m / k, and / or, the elongation at break of the liquid cooling component is 40%-60%.

7. The liquid cooling assembly of claim 1, wherein, The liquid cooling component is a PPO component with a thermal conductivity of 0.73 w / m / k and an elongation at break of 46%.

8. The liquid cooling assembly of any one of claims 1 to 7, wherein, The current collector forms a current collecting cavity, the current collecting cavity communicates with the mating interface, the inner wall of the current collecting 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 component inserted from the mating interface.

9. The liquid cooling assembly of claim 8, wherein, The depth of the limiting step is not less than 2 mm; and / or, the height of the limiting step is not less than 0.1 mm and not greater than the thickness of the plate body of the liquid cooling component; and / or, the current collector is formed with a hot melt layer connected with the liquid cooling component at the limiting step.

10. The liquid cooling assembly of any one of claims 1-7, wherein, The current collector is provided with a chamfer on the mating interface; and / or, a weight-reducing groove is formed on at least part of the outer peripheral surface of the current collector.

11. The liquid-cooling assembly of any one of claims 1-7, wherein, The part of the current collector connected with the liquid cooling component is protruding and forms a mating extension, the mating extension has a mating hole, the mating hole communicates with the current collecting cavity formed by the current collector, and the end of the mating hole away from the current collecting cavity is formed as the mating interface.

12. A battery module, characterized by The battery module comprises the liquid cooling assembly according to any one of claims 1-11.

13. A battery pack, characterized by The battery pack comprises the battery module according to claim 12.

14. A vehicle characterized by comprising: The vehicle comprises the battery pack according to claim 13.

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