WO2024174552A1 - Liquid cooling system and battery pack - Google Patents

Abstract

Provided in the present application are a liquid cooling system and a battery pack. The liquid cooling system comprises a plurality of combined liquid cooling modules, a liquid intake pipeline assembly and a liquid output pipeline assembly, wherein each combined liquid cooling module comprises a plurality of liquid cooling units which are arranged in a stacked manner; the liquid intake pipeline assembly comprises a plurality of liquid intake pipe main lines which are connected in series, and the plurality of liquid cooling units are respectively in communication with the corresponding liquid intake pipe main lines; and the liquid output pipeline assembly comprises a plurality of liquid output pipe main lines which are connected in series, and the plurality of liquid cooling units are respectively in communication with the corresponding liquid output pipe main lines.

Description

Liquid cooling system and battery pack

This application claims the priority of the Chinese patent application filed with the China Patent Office on February 23, 2023, with application number 202310168084.9. The entire contents of the above application are incorporated by reference into this application.

Technical Field

The present application relates to the field of battery technology, and in particular to a liquid cooling system and a battery pack.

Background Art

As the energy storage and power output device of electric vehicles, the power battery pack is the power source of electric vehicles and the guarantee of their endurance. In order for the power battery pack to work normally and safely, the battery modules in the power battery pack need to be equipped with corresponding heat dissipation structures, such as liquid cooling systems, to dissipate the heat generated by the battery modules as quickly as possible.

Traditional power battery packs generally include multiple battery modules, and the cells in each battery module are arranged in a single layer. In order to meet users' higher requirements for the endurance of electric vehicles and enable each battery module to contain more cells and store more electricity, R&D personnel creatively proposed a double-layer battery module layout. However, the liquid cooling system of the double-layer battery module has problems such as large system pressure drop, many flow regulation variables, and inconsistent flow regulation.

In view of the above technical defects, it is urgent to design a liquid cooling system that can reduce system pressure drop and facilitate flow regulation.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a liquid cooling system and a battery pack, which can improve the technical problems of large system pressure drop and difficult flow regulation in the liquid cooling system that should be configured as a double-layer battery module in the related art.

In a first aspect, an embodiment of the present application provides a liquid cooling system, which includes: m combined liquid cooling modules, which are arranged in sequence in a first direction, each of the combined liquid cooling modules includes n liquid cooling units stacked in a second direction, and the second direction is perpendicular to the first direction, and m and n are both integers greater than 1; a liquid inlet pipeline assembly, which includes m liquid inlet pipe main roads arranged in sequence in the first direction, and the m liquid inlet pipe main roads are connected in series with each other, and the n liquid cooling units in each combined liquid cooling module are respectively connected to the corresponding liquid inlet pipe main roads; and a liquid outlet pipeline assembly, which includes m liquid outlet pipe main roads arranged in sequence in the first direction, and the m liquid outlet pipe main roads are connected in series with each other, and the n liquid cooling units in each combined liquid cooling module are respectively connected to the corresponding liquid outlet pipe main roads.

In one embodiment, the combined liquid cooling module has a central axis parallel to the first direction, and the liquid inlet pipeline assembly and the liquid outlet pipeline assembly are symmetrically centered about the central axis.

In one embodiment, the liquid inlet pipe assembly also includes m×n liquid inlet pipe branches, the liquid cooling unit is connected to the liquid inlet pipe main line through the liquid inlet pipe branches, and the n liquid inlet pipe branches in the second direction take the liquid inlet pipe main line as the axis of symmetry; the liquid outlet pipe assembly also includes m×n liquid outlet pipe branches, the liquid cooling unit is connected to the liquid outlet pipe main line through the liquid outlet pipe branches, and the n liquid outlet pipe branches in the second direction take the liquid outlet pipe main line as the axis of symmetry.

In one embodiment, the liquid inlet pipeline assembly includes a total liquid inlet, which is connected to the first liquid inlet pipe main line arranged in the first direction; the liquid outlet pipeline assembly includes a total liquid outlet, which is connected to the first liquid outlet pipe main line arranged in the first direction; the liquid cooling system also includes a cold plate, a cold plate liquid inlet pipe and a cold plate liquid outlet pipe, the cold plate is arranged on the side of the mth combined liquid cooling module arranged in the first direction away from the first combined liquid cooling module arranged in the first direction, the cold plate liquid inlet pipe is connected to the liquid inlet pipe main line corresponding to the mth combined liquid cooling module, and the cold plate liquid outlet pipe is connected to the liquid outlet pipe main line corresponding to the mth combined liquid cooling module.

In one embodiment, m=3, the inner diameters of the m inlet pipe main routes and the inner diameters of the m outlet pipe main routes are the first inner diameters; among the cold plate inlet pipe, the cold plate outlet pipe, and the first inlet pipe branch and the first outlet pipe branch arranged in the first direction, the inner diameters of the cold plate inlet pipe, the inner diameters of the cold plate outlet pipe, the inner diameters of the first inlet pipe branch, and the inner diameters of the first outlet pipe branch are the second inner diameters; among the second inlet pipe branch and the third inlet pipe branch arranged in the first direction, and the second outlet pipe branch and the third outlet pipe branch arranged in the first direction, the inner diameters of the second inlet pipe branch, the inner diameters of the third inlet pipe branch, the inner diameters of the second outlet pipe branch, and the inner diameters of the third outlet pipe branch are the third inner diameters.

In one embodiment, n=2, the liquid inlet pipeline assembly also includes m liquid inlet four-way joints, the liquid inlet four-way joint includes a first liquid inlet end, a first liquid outlet end and two second liquid outlet ends, the first liquid inlet end is connected to the liquid inlet pipe main road; the first liquid inlet end and the first liquid outlet end extend along the first direction, and the first liquid outlet end is connected to the liquid inlet pipe main road or the cold plate liquid inlet pipe, and the two second liquid outlet ends take the liquid inlet pipe main road as the symmetry axis; the liquid outlet pipeline assembly also includes m liquid outlet four-way joints, the liquid outlet four-way joint includes a third liquid outlet end, a third liquid inlet end and two fourth liquid inlet ends, the third liquid outlet end is connected to the liquid outlet pipe main road; the third liquid outlet end and the third liquid inlet end extend along the first direction, and the third liquid inlet end is connected to the liquid outlet pipe main road or the cold plate liquid outlet pipe, and the two fourth liquid inlet ends take the liquid outlet pipe main road as the symmetry axis.

In one embodiment, a first throttling device is provided on the liquid inlet four-way joint, and a second throttling device is provided on the liquid outlet four-way joint.

In one embodiment, the liquid cooling unit includes: a plurality of serpentine tubes arranged in sequence in the first direction, each of the serpentine tubes including a first end and a second end, the first end being configured to input coolant, and the second end being configured to output coolant; a first corrugated connection component, the first corrugated connection component including a first liquid inlet, a plurality of first liquid outlets, and a plurality of first corrugated connection tubes arranged in sequence in the first direction and connected in series with each other, the first liquid inlet being connected to the main liquid inlet tube, the first liquid outlet being connected to the first end of the serpentine tube, and the first corrugated connection tube connecting two adjacent first liquid outlets; a second corrugated connection component, the second corrugated connection component including a second liquid outlet, a plurality of second liquid inlets, and a plurality of second corrugated connection tubes arranged in sequence in the first direction and connected in series with each other, the second liquid outlet being connected to the main liquid outlet tube, the second liquid inlet being connected to the second end of the serpentine tube, and the second corrugated connection tube connecting two adjacent second liquid inlets.

In a second aspect, an embodiment of the present application provides a battery pack, comprising the liquid cooling system described in any one of the above items and m battery modules, wherein the liquid cooling system comprises m combined liquid cooling modules arranged sequentially in a first direction, and m is an integer greater than 1.

In one embodiment, the battery module includes n battery module cells stacked in a second direction, and a tray arranged between any two adjacent liquid-cooling cells, the main liquid inlet pipe and the main liquid outlet pipe in the combined liquid cooling module are fixed on the tray, and the second direction is perpendicular to the first direction, and n is an integer greater than 1.

Beneficial Effects

Beneficial effects of the present application: The present application provides a liquid cooling system and a battery pack, the liquid cooling system comprising: a plurality of combined liquid cooling modules, a liquid inlet pipeline assembly and a liquid outlet pipeline assembly, wherein the plurality of combined liquid cooling modules are arranged in sequence in a first direction, each combined liquid cooling module comprises a plurality of liquid cooling monomers stacked in a second direction, and the second direction is perpendicular to the first direction; the liquid inlet pipeline assembly comprises a plurality of liquid inlet pipe main roads arranged in sequence in the first direction, and the plurality of liquid inlet pipe main roads are connected in series with each other, and the plurality of liquid cooling monomers in each combined liquid cooling module are respectively connected with the corresponding liquid inlet pipe main roads; the liquid outlet pipeline assembly comprises a plurality of liquid outlet pipe main roads arranged in sequence in the first direction and connected in series with each other, and the plurality of liquid cooling monomers in each combined liquid cooling module are respectively connected with the corresponding liquid outlet pipe main roads. The liquid cooling system provided in the present application enables each of the stacked liquid cooling units to be connected in parallel with each other through the liquid inlet pipe main line and the liquid outlet pipe main line. Since the flow rate in the pipeline is equal to the flow rate in each parallel pipe section, and the resistance loss of each parallel pipe section is equal, the resistance of the fluid flowing into each liquid cooling unit can be reduced, and the resistance of the fluid flowing into each liquid cooling unit can be made more balanced, thereby improving the problem of large system pressure drop caused by the multi-layer arrangement of liquid cooling units.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic top view of a liquid cooling system provided in an embodiment of the present application.

FIG. 2 is a front view schematic diagram of a liquid cooling system provided in an embodiment of the present application.

FIG. 3 is a schematic rear view of a liquid cooling system provided in an embodiment of the present application.

FIG. 4 is a three-dimensional schematic diagram of a combined liquid cooling module provided in an embodiment of the present application.

FIG. 5 is a three-dimensional schematic diagram of a battery pack provided in an embodiment of the present application.

Reference numerals:

first direction X; second direction Y; coolant flow direction K; central axis AA parallel to the first direction; liquid cooling system 01; combined liquid cooling module 10; liquid cooling unit 11; serpentine tube 111; first end 1111; second end 1112; first corrugated connection component 112; first liquid inlet 1121; first liquid outlet 1122; first corrugated connection pipe 1123; second corrugated connection component 113; second liquid outlet 1131; second liquid inlet 1132; second corrugated connection pipe 1133; first quick-connect connector A1; second quick-connect connector A2; Liquid inlet pipeline assembly 20; liquid inlet pipe main line 21; liquid inlet pipe branch 22; total liquid inlet 23; liquid inlet four-way joint 24; first liquid inlet end 241; first liquid outlet end 242; second liquid outlet end 243; liquid outlet pipeline assembly 30; liquid outlet pipe main line 31; liquid outlet pipe branch 32; total liquid outlet 33; liquid outlet four-way joint 34; third liquid outlet end 341; third liquid inlet end 342; fourth liquid inlet end 343; cold plate 40; cold plate liquid inlet pipe 41; cold plate liquid outlet pipe 42; battery pack 100; battery module 101; battery module monomer 1011; tray 1012

Embodiments of the present invention

In a first aspect, the present application provides a liquid cooling system.

FIG. 1 is a top view schematic diagram of a liquid cooling system provided in an embodiment of the present application; FIG. 2 is a front view schematic diagram of a liquid cooling system provided in an embodiment of the present application; FIG. 3 is a rear view schematic diagram of a liquid cooling system provided in an embodiment of the present application; and FIG. 4 is a three-dimensional schematic diagram of a combined liquid cooling module provided in an embodiment of the present application. As shown in FIG. 1-FIG. 4, the liquid cooling system 01 includes: m combined liquid cooling modules 10, a liquid inlet pipeline assembly 20, and a liquid outlet pipeline assembly 30. The m combined liquid cooling modules 10 are arranged in sequence in the first direction X, and each combined liquid cooling module 10 includes n liquid cooling units 11 stacked in the second direction Y, and the second direction Y is perpendicular to the first direction X, and m and n are both integers greater than 1; the liquid inlet pipeline assembly 20 includes m liquid inlet pipe main roads 21 arranged in sequence in the first direction X and connected in series with each other, and the n liquid cooling units 11 in each combined liquid cooling module 10 are respectively connected to the corresponding liquid inlet pipe main roads 21; the liquid outlet pipeline assembly 30 includes m liquid outlet pipe main roads 31 arranged in sequence in the first direction X and connected in series with each other, and the n liquid cooling units 11 in each combined liquid cooling module 10 are respectively connected to the corresponding liquid outlet pipe main roads 31.

In the liquid cooling system 01 provided in the present application, since the m liquid inlet pipe main paths 21 are connected in series with each other, and the n liquid cooling units 11 in each combined liquid cooling module 10 are respectively connected with the corresponding liquid inlet pipe main paths 21; and since the m liquid outlet pipe main paths 31 are connected in series with each other, and the n liquid cooling units 11 in each combined liquid cooling module 10 are respectively connected with the corresponding liquid outlet pipe main paths 31, each of the stacked liquid cooling units 11 can be connected in parallel with each other through the liquid inlet pipe main paths 21 and the liquid outlet pipe main paths 31. The principle of parallel connection of pipelines is similar to that of parallel connection of circuits. The flow rate in the pipeline is equal to the flow rate in each parallel pipe section, and the resistance loss of each parallel pipe section is equal. Therefore, the resistance of the fluid flowing into each liquid cooling unit 11 can be reduced, and the resistance of the fluid flowing into each liquid cooling unit 11 can be made more balanced, thereby improving the problem of large system pressure drop caused by the multi-layer setting of the liquid cooling units 11.

Furthermore, the fluid in the liquid cooling system 01 provided in the present application is a coolant, which is transmitted to the n liquid cooling units 11 in the combined liquid cooling module 10 through the liquid inlet pipeline assembly 20, and then discharged to the outside of the liquid cooling system 01 through the liquid outlet pipeline assembly 30, thereby achieving cooling and heat dissipation. K represents the flow direction of the coolant.

In some embodiments of the present application, the combined liquid cooling module 10 has a central axis AA parallel to the first direction X, and the liquid inlet pipeline assembly 20 and the liquid outlet pipeline assembly 30 use the central axis AA as a symmetry axis.

In the liquid cooling system 01 provided in the present application, the liquid inlet pipeline assembly 20 and the liquid outlet pipeline assembly 30 use the central axis AA parallel to the first direction X as the symmetry axis, which means that the liquid inlet pipeline assembly 20 and the liquid outlet pipeline assembly 30 are symmetrical about the central axis AA. The bilaterally symmetrical arrangement enables the components of the liquid inlet pipeline assembly 20 and the liquid outlet pipeline assembly 30 to be common, and the structure of the liquid inlet pipeline assembly 20, the total length of the pipeline, and the structure of the liquid outlet pipeline assembly 30 are the same. The total length of the pipelines is the same, so that the liquid inlet efficiency of the liquid inlet pipeline assembly 20 and the liquid outlet efficiency of the liquid outlet pipeline assembly 30 can be the same or tend to be the same; and the flow rate of the liquid outlet pipeline assembly 30 can be regulated by directly adjusting the flow rate of the liquid inlet pipeline assembly 20, thereby reducing the flow regulation variable, so that the flow rates of the coolant in the left-right symmetrical liquid inlet pipeline assembly 20 and the liquid outlet pipeline assembly 30 are the same or tend to be the same, which is beneficial to improving the circulation efficiency and heat dissipation stability of the liquid cooling system 01.

In some embodiments of the present application, the liquid inlet pipe assembly 20 also includes m×n liquid inlet pipe branches 22, the liquid cooling unit 11 is connected to the liquid inlet pipe main line 21 through the liquid inlet pipe branches 22, and the n liquid inlet pipe branches 22 in the second direction Y take the liquid inlet pipe main line 21 as the axis of symmetry; the liquid outlet pipe assembly 30 also includes m×n liquid outlet pipe branches 32, the liquid cooling unit 11 is connected to the liquid outlet pipe main line 31 through the liquid outlet pipe branches 32, and the n liquid outlet pipe branches 32 in the second direction Y take the liquid outlet pipe main line 31 as the axis of symmetry.

In the liquid cooling system 01 provided in the present application, the n inlet pipe branches 22 in the second direction Y take the inlet pipe main road 21 as the axis of symmetry, and the n outlet pipe branches 32 in the second direction Y take the outlet pipe main road 31 as the axis of symmetry, which means that the n inlet pipe branches 22 in the second direction Y are symmetrical about the inlet pipe main road 21, and the n outlet pipe branches 32 in the second direction Y are symmetrical about the outlet pipe main road 31, so that the flow rate of the n/2 inlet pipe branches 22 located above the inlet pipe main road 21 and the flow rate of the n/2 inlet pipe branches 22 located below the inlet pipe main road 21 are the same or tend to be the same, and the flow rate of the n/2 outlet pipe branches 32 located above the outlet pipe main road 31 and the flow rate of the n/2 outlet pipe branches 32 located above the outlet pipe main road 31 are the same or tend to be the same. The flow rates of the n/2 liquid outlet pipe branches 32 below the liquid outlet pipe main path 31 are the same, and accordingly, the resistance of the fluid flowing into the n/2 liquid inlet pipe branches 22 located above the liquid inlet pipe main path 21 is the same as or tends to be the same as the resistance of the fluid flowing into the n/2 liquid inlet pipe branches 22 located below the liquid inlet pipe main path 21, and the resistance of the fluid flowing into the n/2 liquid outlet pipe branches 32 located above the liquid outlet pipe main path 31 is the same as or tends to be the same as the resistance of the n/2 liquid outlet pipe branches 32 located below the liquid outlet pipe main path 31, thereby effectively improving the problem of inconsistent upper and lower flow distribution of the liquid inlet pipe assembly 20 and the liquid outlet pipe assembly 30, reducing flow adjustment variables, and making the flow rate of the coolant in the upper and lower symmetrical pipes the same or tends to be the same, which is beneficial to balancing the heat dissipation efficiency of the liquid cooling units 11 located at different levels.

In some embodiments of the present application, the liquid inlet pipeline assembly 20 includes a total liquid inlet 23, and the total liquid inlet 23 is connected to the first liquid inlet pipe main road 21 arranged in the first direction X; the liquid outlet pipeline assembly 30 includes a total liquid outlet 33, and the total liquid outlet 33 is connected to the first liquid outlet pipe main road 31 arranged in the first direction X; the liquid cooling system 01 also includes a cold plate 40, a cold plate liquid inlet pipe 41 and a cold plate liquid outlet pipe 42, the cold plate 40 is arranged on the side of the mth combined liquid cooling module 10 arranged in the first direction X away from the first combined liquid cooling module 10 arranged in the first direction X, the cold plate liquid inlet pipe 41 is connected to the liquid inlet pipe main road 21 corresponding to the mth combined liquid cooling module 10; the cold plate liquid outlet pipe 42 is connected to the liquid outlet pipe main road 31 corresponding to the mth combined liquid cooling module 10.

In the liquid cooling system 01 provided in the present application, since the cold plate liquid inlet pipe 41 is connected to the liquid inlet pipe main path 21 corresponding to the m-th combined liquid cooling module 10, the cold plate liquid inlet pipe 41 and the n liquid cooling monomers 11 are connected in parallel; since the cold plate liquid outlet pipe 42 is connected to the liquid outlet pipe main path 31 corresponding to the m-th combined liquid cooling module 10, the cold plate liquid outlet pipe 42 and the n liquid cooling monomers 11 are connected in parallel; thereby, the cold plate 40 can be connected in parallel with each of the liquid cooling monomers 11, and the principle of pipeline parallel connection is similar to that of circuit parallel connection, and the flow rate in the pipeline is equal to the flow rate in each parallel pipe section; the resistance loss of each parallel pipe section is equal, and therefore, the resistance of the coolant flowing into the cold plate 40 can be reduced, and the consistency of the resistance of the coolant flowing into the cold plate 40 and the resistance of the fluid flowing into each liquid cooling monomer 11 is improved, thereby effectively improving the problem of large system pressure drop between the liquid cooling monomer 11 and the cold plate 40. It should be noted that the cold plate 40 is configured to cool and dissipate heat from electrical heat-generating components other than the battery module.

In some embodiments of the present application, m=3, that is, the liquid cooling system 01 includes three combined liquid cooling modules 10 arranged in sequence in the first direction X.

Optionally, the inner diameters of the m liquid inlet pipe main paths 21 and the inner diameters of the m liquid outlet pipe main paths 31 are the first inner diameters; among the cold plate liquid inlet pipe 41, the cold plate liquid outlet pipe 42, and the first liquid inlet pipe branch 22 and the first liquid outlet pipe branch 32 arranged in the first direction X, the inner diameters of the cold plate liquid inlet pipe 41, the inner diameters of the cold plate liquid outlet pipe 42, the inner diameters of the first liquid inlet pipe branch 22, and the inner diameters of the first liquid outlet pipe branch 32 are the second inner diameters; in the first direction In the second liquid inlet pipe branch 22 and the third liquid inlet pipe branch 22 arranged upwards, and the second liquid outlet pipe branch 32 and the third liquid outlet pipe branch 32 arranged in the first direction X, the inner diameter of the second liquid inlet pipe branch 22, the inner diameter of the third liquid inlet pipe branch 22, the inner diameter of the second liquid outlet pipe branch 32, and the inner diameter of the third liquid outlet pipe branch 32 are the third inner diameters; the first inner diameter is larger than the third inner diameter, and the third inner diameter is larger than the second inner diameter.

Exemplarily, the first inner diameter is 15 mm, the second inner diameter is 8 mm, and the third inner diameter is 12 mm. Since each inlet pipe main path 21 is connected in series with each other, and each outlet pipe main path 31 is connected in series with each other, therefore, setting the inner diameters of the m inlet pipe main paths 21 and the m outlet pipe main paths 31 uniformly to a first inner diameter larger than the inner diameters of the inlet pipe branch paths 22 and the outlet pipe branch paths 32 is beneficial to improving the consistency of the flow rate of each pipeline; since the inlet pipe branch paths 22 close to the total inlet port 23 and the outlet pipe branch paths 32 close to the total outlet port 33 often obtain more flow, it is necessary to set the inner diameters of the inlet pipe branch paths 22 close to the total inlet port 23 and the outlet pipe branch paths 32 close to the total outlet port 33 to be smaller, so that the second inner diameters of the first inlet pipe branch paths 22 and the first outlet pipe branch paths 32 arranged in the first direction X are smaller than the inner diameters of the first inlet pipe branch paths 22 and the first outlet pipe branch paths 32 arranged in the first direction X. The third inner diameter of the second liquid inlet pipe branch 22 and the second liquid outlet pipe branch 32 arranged in the first direction X is set to be larger than the third inner diameter of the second liquid inlet pipe branch 22 and the first liquid outlet pipe branch 32 arranged in the first direction X, which is beneficial to improve the consistency of the flow rate of each pipeline; since m=3 in this embodiment, that is, the third liquid inlet pipe branch 22 and the third liquid outlet pipe branch 32 arranged in the first direction X are located at the end of each liquid outlet pipe branch 32, and in the pipeline design, there is additional resistance in the end of the pipeline, so it is necessary to increase the inner diameter of the pipeline. Therefore, the inner diameter of the third liquid inlet pipe branch 22 and the third liquid outlet pipe branch 32 arranged in the first direction X is set to be larger than the third inner diameter of the second inner diameter of the first liquid inlet pipe branch 22 and the first liquid outlet pipe branch 32 arranged in the first direction X, which is beneficial to improve the consistency of the flow rate of each pipeline.

In some embodiments of the present application, n=2, that is, each of the combined liquid cooling modules 10 includes two liquid cooling units 11 stacked in the second direction Y.

Optionally, the liquid inlet pipeline assembly 20 also includes m liquid inlet four-way joints 24, the liquid inlet four-way joints 24 include a first liquid inlet end 241, a first liquid outlet end 242 and two second liquid outlet ends 243, the first liquid inlet end 241 is connected to the liquid inlet pipe main road 21; the first liquid inlet end 241 and the first liquid outlet end 242 extend along the first direction X, and the first liquid outlet end 242 is connected to the liquid inlet pipe main road 21 or the cold plate liquid inlet pipe 41, and the two second liquid inlet ends take the liquid inlet pipe main road 21 as the axis of symmetry.

Exemplarily, the first liquid inlet end 241 and the first liquid outlet end 242 of the liquid inlet four-way joint 24 can connect two adjacent liquid inlet pipe main paths 21 or adjacent liquid inlet pipe main paths 21 and the cold plate liquid inlet pipe 41; the two second liquid outlet ends 243 of the liquid inlet four-way joint 24 can connect the upper and lower liquid inlet pipe branches 22 in the second direction Y, and since the two second liquid outlet ends 243 take the liquid inlet pipe main path 21 as the axis of symmetry, the structural design of the two second liquid outlet ends 243 is the same, so that the angles between the two second liquid outlet ends 243 and the liquid inlet pipe main path 21 can be consistent, reducing the flow adjustment variable, and making the resistance and flow rate of the coolant flowing into the two second liquid outlet ends 243 the same or tending to be the same, which is beneficial to improving the flow consistency of the liquid-cooled monomers 11 of different membrane layers.

Optionally, the liquid outlet pipeline assembly 30 also includes m liquid outlet four-way joints 34, the liquid outlet four-way joints 34 include a third liquid outlet end 341, a third liquid inlet end 342 and two fourth liquid inlet ends 343, the third liquid outlet end 341 is connected to the liquid outlet pipe main line 31; the third liquid outlet end 341 and the third liquid inlet end 342 extend along the first direction X, and the third liquid inlet end 342 is connected to the liquid outlet pipe main line 31 or the cold plate liquid outlet pipe 42, and the two fourth liquid inlet ends 343 take the liquid outlet pipe main line 31 as the axis of symmetry.

Exemplarily, the third liquid outlet end 341 and the third liquid inlet end 342 of the liquid outlet four-way joint 34 can connect two adjacent liquid outlet pipe main paths 31 or adjacent liquid outlet pipe main paths 31 and the cold plate liquid outlet pipe 42; the two fourth liquid inlet ends 343 of the liquid outlet four-way joint 34 can connect the upper and lower liquid outlet pipe branches 32 in the second direction Y, and since the two fourth liquid inlet ends 343 take the liquid outlet pipe main path 31 as the axis of symmetry, the angles between the two fourth liquid inlet ends 343 and the liquid outlet pipe main path 31 can be made consistent, thereby reducing the flow adjustment variable, which is beneficial to improving the flow consistency of the liquid cooling units 11 of different membrane layers.

In some embodiments of the present application, a first throttling device is provided on the liquid inlet four-way joint 24 , and a second throttling device is provided on the liquid outlet four-way joint 34 .

Exemplarily, the first throttling device can adjust the flow of the liquid inlet pipeline assembly 20, and the second throttling device can adjust the flow of the liquid outlet pipeline assembly 30. The present application is advantageous in further improving the consistency of the flow in the pipelines entering each liquid cooling unit 11 and the cold plate 40 and improving the consistency of the flow in the pipelines discharging each liquid cooling unit 11 and the cold plate 40 by arranging the first throttling device on the liquid inlet four-way joint 24 and the second throttling device on the liquid outlet four-way joint 34.

In some embodiments of the present application, the liquid cooling unit 11 includes: a plurality of serpentine tubes 111 , a first corrugated connection component 112 and a second corrugated connection component 113 .

The serpentine tube 111 is configured to dissipate heat for the battery cells. Exemplarily, each of the serpentine tubes 111 can cool two rows of battery cells at the same time. The serpentine tube 111 includes a first end 1111 and a second end 1112. The first end 1111 is configured to input coolant, and the second end 1112 is configured to output coolant.

In the liquid cooling system 01 provided in the present application, the serpentine tube 111 has a tortuous and uneven surface, so as to increase the contact area between the serpentine tube 111 and the battery cell when it is configured as a battery pack, thereby improving the heat dissipation efficiency.

The first corrugated connection component 112 includes a first liquid inlet 1121, a plurality of first liquid outlets 1122, and a plurality of first corrugated connection tubes 1123 arranged in sequence and connected in series in the first direction X. The first liquid inlet 1121 is connected to the liquid inlet pipe main path 21, the first liquid outlet 1122 is connected to the first end 1111 of the serpentine tube 111, and the first corrugated connection tube 1123 connects two adjacent first liquid outlets 1122.

In the liquid cooling system 01 provided in the present application, since a plurality of first corrugated connecting tubes 1123 are connected in series with each other, the first end 1111 of each serpentine tube 111 is connected to the first corrugated connecting tube 1123 via the first liquid outlet 1122. Therefore, the first end 1111 of each serpentine tube 111 can be connected in parallel, thereby improving the heat dissipation uniformity of the liquid cooling unit 11.

The second corrugated connection assembly 113 includes a second liquid outlet 1131, a plurality of second liquid inlets 1132, and a plurality of second corrugated connection tubes 1133 arranged in sequence and connected in series in the first direction X. The second liquid outlet 1131 is connected to the main liquid outlet pipe path 31, the second liquid inlet 1132 is connected to the second end 1112 of the serpentine tube 111, and the second corrugated connection tube 1133 connects two adjacent second liquid inlets 1132.

In the liquid cooling system 01 provided in the present application, since a plurality of second corrugated connecting tubes 1133 are connected in series, the second end 1112 of each serpentine tube 111 is connected to the second corrugated connecting tube 1133 via the second liquid inlet 1132. Therefore, the second end 1112 of each serpentine tube 111 can be connected in parallel, thereby improving the heat dissipation uniformity of the liquid cooling unit 11.

In some embodiments of the present application, the liquid cooling system 01 also includes a plurality of first quick-connect connectors A1 and a plurality of second quick-connect connectors A2, wherein the first quick-connect connector A1 is configured to connect the first liquid inlet 1121 of the first corrugated connection component 112 with the liquid inlet pipe main path 21; the second quick-connect connector A2 is configured to connect the second liquid outlet 1131 of the second corrugated connection component 113 with the liquid outlet pipe main path 31.

In a second aspect, an embodiment of the present application provides a battery pack.

FIG5 is a three-dimensional schematic diagram of a battery pack provided by an embodiment of the present application. In combination with FIG1 to FIG5, the battery pack 100 includes the liquid cooling system 01 described in any one of the above items and m battery module monomers 1011, the liquid cooling system 01 includes m combined liquid cooling modules 10 arranged in sequence in a first direction X, and m is an integer greater than 1, and the combined liquid cooling module 10 is configured to dissipate heat for the battery module monomers 1011.

In some embodiments of the present application, the battery module monomer 1011 includes n battery module monomers 1011 stacked in a second direction Y, and a tray 1012 arranged between any two adjacent liquid cooling monomers 11, the main liquid inlet pipe 21 and the main liquid outlet pipe 31 in the combined liquid cooling module 10 are fixed on the tray 1012, and the second direction Y is perpendicular to the first direction X, and n is an integer greater than 1.

Optionally, the battery module unit 1011 includes a plurality of battery cells arranged in an array, and the shape of the battery cells is, for example, cylindrical; a structural adhesive is arranged between the liquid cooling unit 11 and the tray 1012, and the structural adhesive is configured to fix the liquid cooling unit 11 and the tray 1012.

In summary, the present application provides a liquid cooling system and a battery pack, the liquid cooling system comprising: a plurality of combined liquid cooling modules, a liquid inlet pipeline assembly and a liquid outlet pipeline assembly, the plurality of combined liquid cooling modules are arranged in sequence in the first direction, each combined liquid cooling module comprises a plurality of liquid cooling monomers stacked in the second direction, and the second direction is perpendicular to the first direction; the liquid inlet pipeline assembly comprises a plurality of liquid inlet pipe main roads arranged in sequence in the first direction, and the plurality of liquid inlet pipe main roads are connected in series with each other, and the plurality of liquid cooling monomers in each combined liquid cooling module are respectively connected with the corresponding liquid inlet pipe main roads; the liquid outlet pipeline assembly comprises a plurality of liquid outlet pipe main roads arranged in sequence in the first direction and connected in series with each other, and the plurality of liquid cooling monomers in each combined liquid cooling module are respectively connected with the corresponding liquid outlet pipe main roads. The liquid cooling system provided by the present application has the advantages of small system pressure drop, few flow regulation variables and high flow regulation consistency.

Claims (10)

1. A liquid cooling system, wherein the liquid cooling system comprises:

   m combined liquid cooling modules are arranged in sequence in a first direction, each of the combined liquid cooling modules comprises n liquid cooling units stacked in a second direction, and the second direction is perpendicular to the first direction;

   A liquid inlet pipeline assembly, wherein the liquid inlet pipeline assembly includes m liquid inlet pipe main paths arranged in sequence in the first direction, and the m liquid inlet pipe main paths are connected in series with each other, and the n liquid cooling units in each of the combined liquid cooling modules are respectively connected to the corresponding liquid inlet pipe main paths; and

   The liquid outlet pipeline assembly includes m liquid outlet pipe main paths arranged in sequence in the first direction, and the m liquid outlet pipe main paths are connected in series with each other, and the n liquid cooling units in each combined liquid cooling module are respectively connected to the corresponding liquid outlet pipe main paths.
2. The liquid cooling system according to claim 1, wherein the combined liquid cooling module has a central axis parallel to the first direction, and the liquid inlet pipeline assembly and the liquid outlet pipeline assembly are symmetrical with the central axis.
3. The liquid cooling system according to claim 2, wherein:

   The liquid inlet pipe assembly further includes m×n liquid inlet pipe branches, the liquid cooling unit is connected to the liquid inlet pipe main line through the liquid inlet pipe branches, and the n liquid inlet pipe branches in the second direction are symmetrically centered on the liquid inlet pipe main line;

   The liquid outlet pipe assembly also includes m×n liquid outlet pipe branches, the liquid cooling unit is connected to the liquid outlet pipe main line through the liquid outlet pipe branches, and the n liquid outlet pipe branches in the second direction take the liquid outlet pipe main line as a symmetry axis.
4. The liquid cooling system according to claim 3, wherein:

   The liquid inlet pipeline assembly includes a main liquid inlet, and the main liquid inlet is connected to the first liquid inlet main pipeline arranged in the first direction;

   The liquid outlet pipeline assembly includes a main liquid outlet, and the main liquid outlet is connected to the first liquid outlet pipe main route arranged in the first direction;

   The liquid cooling system also includes a cold plate, a cold plate liquid inlet pipe and a cold plate liquid outlet pipe. The cold plate is arranged on a side of the mth combined liquid cooling module arranged in the first direction away from the first combined liquid cooling module arranged in the first direction. The cold plate liquid inlet pipe is connected to a main liquid inlet pipe corresponding to the mth combined liquid cooling module, and the cold plate liquid outlet pipe is connected to a main liquid outlet pipe corresponding to the mth combined liquid cooling module.
5. The liquid cooling system according to claim 4, wherein m=3,

   The inner diameters of the m liquid inlet pipe main paths and the inner diameters of the m liquid outlet pipe main paths are first inner diameters;

   Among the cold plate liquid inlet pipe, the cold plate liquid outlet pipe, and the first liquid inlet pipe branch and the first liquid outlet pipe branch arranged in the first direction, the inner diameter of the cold plate liquid inlet pipe, the inner diameter of the cold plate liquid outlet pipe, the inner diameter of the first liquid inlet pipe branch, and the inner diameter of the first liquid outlet pipe branch are the second inner diameter;

   Among the second liquid inlet pipe branch and the third liquid inlet pipe branch arranged in the first direction, and the second liquid outlet pipe branch and the third liquid outlet pipe branch arranged in the first direction, the inner diameter of the second liquid inlet pipe branch, the inner diameter of the third liquid inlet pipe branch, the inner diameter of the second liquid outlet pipe branch, and the inner diameter of the third liquid outlet pipe branch are the third inner diameters;

   The first inner diameter is greater than the third inner diameter, and the third inner diameter is greater than the second inner diameter.
6. The liquid cooling system according to claim 4, wherein n=2,

   The liquid inlet pipeline assembly further includes m liquid inlet four-way joints, the liquid inlet four-way joint includes a first liquid inlet end, a first liquid outlet end and two second liquid outlet ends, the first liquid inlet end is connected to the main liquid inlet pipe;

   The first liquid inlet end and the first liquid outlet end extend along the first direction, and the first liquid outlet end is connected to the main liquid inlet pipe or the cold plate liquid inlet pipe, and the two second liquid outlet ends take the main liquid inlet pipe as a symmetry axis;

   The liquid outlet pipeline assembly further includes m liquid outlet four-way joints, the liquid outlet four-way joint includes a third liquid outlet end, a third liquid inlet end and two fourth liquid inlet ends, the third liquid outlet end is connected to the main liquid outlet pipe;

   The third liquid outlet and the third liquid inlet extend along the first direction, and the third liquid inlet is connected to the main liquid outlet pipe or the cold plate liquid outlet pipe, and the two fourth liquid inlets take the main liquid outlet pipe as a symmetry axis.
7. The liquid cooling system according to claim 6, wherein a first throttling device is provided on the liquid inlet four-way joint, and a second throttling device is provided on the liquid outlet four-way joint.
8. The liquid cooling system according to any one of claims 1 to 7, wherein the liquid cooling unit comprises:

   A plurality of serpentine tubes are arranged in sequence in the first direction, each of the serpentine tubes comprises a first end and a second end, the first end is configured to input a coolant, and the second end is configured to output the coolant;

   a first corrugated connection assembly, the first corrugated connection assembly comprising a first liquid inlet, a plurality of first liquid outlets, and a plurality of first corrugated connection pipes arranged in sequence in the first direction and connected in series with each other, the first liquid inlet being connected to the main liquid inlet pipe, the first liquid outlet being connected to the first end of the serpentine pipe, and the first corrugated connection pipe connecting two adjacent first liquid outlets;

   A second corrugated connection component, the second corrugated connection component includes a second liquid outlet, a plurality of second liquid inlets, and a plurality of second corrugated connection tubes arranged in sequence in the first direction and connected in series with each other, the second liquid outlet is connected to the main liquid outlet tube, the second liquid inlet is connected to the second end of the serpentine tube, and the second corrugated connection tube connects two adjacent second liquid inlets.
9. A battery pack, wherein the battery pack comprises the liquid cooling system as described in any one of claims 1 to 8 and m battery modules, and the liquid cooling system comprises m combined liquid cooling modules arranged in sequence in a first direction.
10. The battery pack according to claim 9, wherein the battery module includes n battery module cells stacked in a second direction, and a tray arranged between any two adjacent liquid-cooled cells, the main liquid inlet pipe and the main liquid outlet pipe in the combined liquid cooling module are fixed on the tray, and the second direction is perpendicular to the first direction.