Liquid-cooled core rod and liquid-cooled battery

Abstract

The present invention provides a liquid-cooled mandrel, wherein a plurality of liquid-cooling tubes are arranged inside the mandrel, wherein the liquid-cooling tubes include M1 liquid-cooling ascending channels and M2 liquid-cooling descending channels parallel to the central axis of the mandrel, wherein M1 and M2 are natural numbers greater than 0, and the liquid outlet of each liquid-cooling ascending channel is connected to the liquid inlet of at least one liquid-cooling descending channel, and the liquid inlet of the M1 liquid-cooling ascending channel and the liquid outlet of the M2 liquid-cooling descending channel are located at the same end of the mandrel. The present invention arranges liquid-cooling tubes inside the mandrel, and carefully arranges the proportion and position of the liquid-cooling tubes and the connecting portion, thereby achieving high heat dissipation while avoiding the influence of the internal liquid-cooling tubes on the bearing capacity of the mandrel, thereby obtaining a mandrel with high heat dissipation capacity and high stability.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a liquid-cooled core rod and a liquid-cooled battery. Background Art

[0002] With the continuous development of the new energy industry, its application areas are constantly expanding. As a result, higher safety performance requirements are placed on the battery cells themselves, and the thermal management of battery cells and related modules has become the focus of research for many new energy manufacturers.

[0003] Existing battery cells and related modules usually achieve heat dissipation of the battery cells by constructing a liquid cooling system or an air cooling system. However, the existing heat dissipation system often requires the installation of a liquid cooling channel between the batteries. On the one hand, the additional liquid cooling channel may increase the overall weight and volume of the battery and affect the battery energy density. On the other hand, even if a liquid cooling channel is installed between the batteries, the heat dissipation effect still cannot meet the ideal requirements. A possible solution is to set the liquid cooling channel inside the battery cell in the form of a core rod. However, the liquid cooling channel installed inside the battery cell may weaken the structural integrity of the core rod and may cause its carrying capacity to decrease. For the core rod, in order to improve the heat dissipation efficiency, the heat exchange area must be increased as much as possible, and the increase in the heat exchange area may lead to a decrease in the carrying capacity. Increasing the volume of the core rod to ensure the heat dissipation effect and carrying capacity may lead to a loss of energy density. How to improve the heat dissipation capacity and maintain the energy density while maintaining the stability and integrity of the battery core rod structure is a major difficulty in current research. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention proposes a core rod. By arranging a liquid cooling tube inside the core rod and carefully setting the proportion and position of the liquid cooling tube and the connecting part, high heat dissipation is achieved while avoiding the influence of the internal liquid cooling tube on the bearing capacity of the core rod, thereby obtaining a core rod with high heat dissipation capacity and high stability.

[0005] In the first aspect, the present invention proposes a core rod, in which a plurality of liquid-cooling tubes are arranged, and the liquid-cooling tubes include M1 liquid-cooling upward channels and M2 liquid-cooling downward channels parallel to the central axis of the core rod, M1 and M2 are natural numbers greater than 0, and the liquid outlet of each liquid-cooling upward channel is connected with the liquid inlet of at least one liquid-cooling downward channel; the liquid inlet of the M1 liquid-cooling upward channel and the liquid outlet of the M2 liquid-cooling downward channel are located at the same end of the core rod, and M1+M2-1 connecting parts parallel to the central axis of the core rod are also provided in the core rod, and the connecting parts are fixedly connected to the lower end of the core rod, and divide the liquid cooling tube into a liquid-cooling upward channel and / or a liquid-cooling downward channel.

[0006] As a further solution, the ratio of the total width of the liquid cooling tube to the core rod is greater than 0.5.

[0007] As a further solution, the ratio of the liquid cooling tube to the total width of the core rod is selected from 0.5-0.7.

[0008] Among them, the liquid outlet of M1 liquid-cooled upward channel and the liquid inlet of M2 liquid-cooled downward channel are connected to each other through the liquid-cooled turning cavity, and M1+M2 is an even number.

[0009] Wherein, the ratio of the total width of the connecting portion to the total width of the core rod is greater than 0.4.

[0010] As a further solution, the ratio of the total width of the connecting portion to the total width of the core rod is greater than 0.45.

[0011] Among them, the ratio of the width of the (M1+M2-1) / 2th connecting portion to the total width of the core rod is greater than 0.05.

[0012] As a further solution, the ratio of the width of the (M1+M2-1) / 2th connecting portion to the total width of the core rod is selected from 0.05-0.08.

[0013] Among them, the ratio of the width of the (M1+M2-1) / 2th connecting portion to the width of the remaining connecting portions is greater than 1.5.

[0014] As a further solution, the ratio of the width of the (M1+M2-1) / 2th connecting portion to the width of the remaining connecting portions is selected from 1.5-1.8.

[0015] As a further solution, the ratio of the connecting portion to the core rod length is selected from 0.75-0.85.

[0016] As a further solution, the ratio of the connecting portion to the core rod length is selected from 0.7-0.9.

[0017] The ratio of the width of the liquid cooling tube to the (M1+M2-1) / 2th connecting portion is selected from 1.5-2.5.

[0018] The ratio of the width of the liquid cooling tube to the (M1+M2-1) / 2th connecting portion is selected from 1.8-2.2.

[0019] The ratio of the total width of the liquid cooling tube to the total width of the core rod is selected from 0.25-0.3.

[0020] As a further solution, the M1+M2-1 root connection part, M1+M2-1 is selected from 3-8.

[0021] As a further solution, the core rod wall thickness is greater than 0.5 mm.

[0022] As a further solution, the core rod wall thickness is greater than 0.8 mm.

[0023] As a further solution, the width of the liquid cooling tube, the width of the connecting part, the total width of the core rod, the number of liquid cooling tubes and the number of connecting parts are such that the liquid cooling tube width / total width of the core rod = 0.5, the connecting part width / liquid cooling tube width = 0.9, and the width of the upstream channel or the downstream channel is set to be less than 20 mm.

[0024] As a further solution, the core rod is further provided with a first insulating sealing component, and the first insulating sealing component is provided with a sealing card for sealing the upper end of the core rod, and the sealing card is fixedly connected to the upper end of the core rod.

[0025] As a further solution, the first insulating sealing assembly is further provided with an end portion fixedly connected to the battery housing assembly.

[0026] As a further solution, the core rod further includes a second sealing assembly, and the second sealing assembly is detachably connected to the lower end of the core rod.

[0027] As a further solution, the second sealing member is provided with a sealed liquid inlet and a sealed liquid outlet which match the liquid inlet and the liquid outlet.

[0028] As a further solution, the second sealing member is further provided with a second fixing hole matching with the first fixing hole.

[0029] As a further solution, there is an inwardly inclined slope area on the outer contour of the contact surface between the second sealing member and the housing assembly.

[0030] As a further solution, a first concentric positioning hole is provided at the midpoint of the lower end of the core rod, the first concentric positioning hole is located on the (M1+M2-1) / 2th connecting portion, and a second concentric positioning hole coaxial with the first concentric positioning hole is provided on the end.

[0031] As a further solution, first fixing holes are respectively provided on the outer sides of the liquid inlet and the liquid outlet of the core rod, and the first fixing holes are used for fixed connection with the shell assembly.

[0032] In a second aspect, the present invention further provides a liquid-cooled battery, comprising the core rod provided by the present invention.

[0033] In a third aspect, the present invention further provides a method for preparing a core rod, comprising the following steps:

[0034] S1: Extruding a metal having a thermal conductivity greater than 100 W / (m·K) to obtain a core rod profile;

[0035] S2: After the core rod profile is divided, the support ribs are removed and the first concentric positioning hole is milled out by a CNC milling process to obtain a core rod precursor;

[0036] S3: Fixedly connecting the first insulating sealing component to the core rod precursor to obtain the core rod.

[0037] As a further solution, the metal having a thermal conductivity greater than 100 W / (m·K) is selected from any one of an alloy or a single metal having a thermal conductivity greater than 100 W / (m·K).

[0038] As a further solution, the alloy is selected from any one of aluminum alloy and copper alloy, and the single metal is selected from any one of copper, aluminum, beryllium, tungsten, molybdenum and zinc.

[0039] As a further solution, the extrusion ratio of the extrusion molding is selected from 8 to 12, the extrusion temperature is selected from 350 to 500°C, the extrusion speed is selected from 0.5 to 20 m / min, the extrusion tonnage is selected from 500 to 3000 tons, and the cooling speed is selected from 50 to 80°C / min.

[0040] As a further solution, the step of milling out the supporting ribs by a milling machine in S2 is to first fix the core rod profile on the milling machine workbench, and then use a high-speed steel milling cutter to mill out the supporting ribs inside the core rod profile according to the preset linear channel and connection depth and width.

[0041] As a further solution, in S2, the preparation step of the first concentric positioning hole is to mill off the internal supporting ribs of the core rod profile, flip the core rod profile, and mill out the first concentric positioning hole to obtain a liquid-cooled core rod precursor.

[0042] As a further solution, in S2, the temperature of the CNC milling process is selected from 10 to 40°C, the feed speed is selected from 0.05 to 0.5 mm / tooth, and the cutting speed is selected from 50 to 200 m / min.

[0043] As a further solution, the material of the first insulating sealing component in S3 is selected from any one of rubber and plastic.

[0044] As a further solution, the method of fixedly connecting the first insulating sealing component and the core rod precursor in S3 is selected from any one of injection molding and crimping.

[0045] Compared with the prior art, the present invention has at least the following beneficial effects:

[0046] 1. By setting the liquid cooling tube inside the core rod, the internal high temperature problem generated by the energy storage device during high-rate charging and discharging and long-term cyclic use is effectively solved, so that the equipment can still maintain good thermal stability under high-load working conditions, extend the service life and improve the overall performance.

[0047] By carefully setting the position and structure of the liquid cooling tube and the joint inside the core rod, it is ensured that the core rod can still maintain sufficient load-bearing capacity in the presence of the liquid cooling tube, thereby ensuring the overall stability and reliability of the battery core rod structure. This design balances the cooling function and structural strength, allowing the equipment to have effective heat dissipation performance while still being able to withstand mechanical stress in various working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0049] In the attached picture:

[0050] Figure 1 is a longitudinal cross-sectional view of a mandrel 1;

[0051] Figure 2 It is the structure diagram of the mandrel 1;

[0052] Figure 3 is a front view of the second sealing member 19;

[0053] Among them, 1-core rod; 11-liquid cooling tube; 111-liquid cooling upward channel; 112-liquid cooling downward channel; 13-connecting part; 14-liquid inlet; 15-liquid outlet; 16-first insulating sealing component; 161-sealing card; 162-end; 163-second concentric positioning hole; 17-first concentric positioning hole; 18-first fixing hole; 19-second sealing member; 191-sealed liquid inlet; 192-sealed liquid outlet. DETAILED DESCRIPTION

[0054] For ease of understanding, the present invention will be described in more detail below and examples of the present invention are given, but the scope of the present invention is not limited thereby.

[0055] In a first aspect, the present invention provides a liquid-cooled mandrel, such as Figure 1-2 As shown, a plurality of liquid cooling tubes 11 are arranged in the core rod 1, and the liquid cooling tube 11 includes M1 liquid cooling upward channels 111 and M2 liquid cooling downward channels 112 parallel to the central axis of the core rod 1, M1 and M2 are natural numbers greater than 0, and the liquid outlet of each liquid cooling upward channel 111 is connected with the liquid inlet of at least one liquid cooling downward channel 112; the liquid inlet 14 of the M1 liquid cooling upward channel 111 and the liquid outlet 15 of the M2 liquid cooling downward channel 112 are located at the same end of the core rod 1, and M1+M2-1 connecting parts 13 parallel to the central axis of the core rod 1 are also arranged in the core rod 1, and the connecting part 13 is fixedly connected to the lower end of the core rod 1, and divides the liquid cooling tube 11 into the liquid cooling upward channel 111 and / or the liquid cooling downward channel 112, so as to improve the bearing capacity of the core rod 1.

[0056] Compared with the traditional liquid cooling system, the present invention arranges the liquid cooling tube inside the core rod. On the one hand, it avoids the influence of the additional liquid cooling tube on the overall weight and volume of the battery in the traditional liquid cooling system. On the other hand, the liquid cooling tube arranged inside the core rod can effectively improve the heat dissipation efficiency, overcoming the defect of insufficient heat dissipation efficiency of the traditional liquid cooling system. On this basis, in order to solve the problem of reduced bearing capacity of the core rod caused by the built-in liquid cooling tube of the core rod and optimize the heat dissipation efficiency of the core rod, we further optimized the design of the liquid cooling tube inside the core rod. First, on the basis that the liquid inlet 14 and the liquid outlet 15 of the liquid cooling tube 11 are located at the same end of the core rod 1, we further arrange M1 liquid cooling upward channels 111 and M2 liquid cooling downward channels 112 parallel to the central axis of the core rod 1, and ensure that the liquid inlet 14 and the liquid outlet 15 of the M1 liquid cooling upward channel 111 are The liquid outlet 15 of the M2 liquid-cooling downward channel 112 is located at the same end of the core rod 1, so that the liquid-cooling tube 11 constructed in the core rod 1 is a U-shaped structure. We believe that the U-shaped liquid-cooling tube, on the one hand, helps to optimize the heat exchange capacity to a greater extent and alleviate the stress caused by the internal coolant flow. Secondly, the design of the connecting part 13 solves the problem of insufficient bearing capacity that may be caused by the core rod being provided with the liquid-cooling tube 11, especially the M1+M2-1 connecting part matched with the liquid-cooling upward channel 111 and the liquid-cooling downward channel 112, which can provide sufficient support for the liquid-cooling tube 11 and fully disperse the internal stress and external pressure of the core rod 1, thereby improving the supporting capacity of the core rod 1; at the same time, the existence of the connecting part 13 also helps to further increase the thermal contact area, so as to obtain a core rod with high heat dissipation capacity and high stability.

[0057] The total width of the core rod 1 refers to the size of the widest part of the cross section of the core rod 1. As a further solution, the ratio of the total width of the liquid cooling tube 11 to the total width of the core rod 1 is greater than 0.5. When the ratio of the total width of the liquid cooling tube 11 to the total width of the core rod 1 is greater than 0.5, it helps to fully ensure the heat dissipation capacity of the core rod 1 and optimize the heat dissipation effect.

[0058] As a further solution, the ratio of the liquid cooling tube 11 to the total width of the core rod 1 is selected from 0.5-0.7. When the liquid cooling tube 11 is used, it helps to further improve the stability of the core rod 1 while fully ensuring the heat dissipation capacity of the core rod.

[0059] Among them, the liquid outlets of M1 liquid-cooling upward channels 111 and the liquid inlets of M2 liquid-cooling downward channels 112 are connected to each other through the liquid-cooling turning cavity, and M1+M2 is an even number.

[0060] The ratio of the total width of the connecting portion 13 to the total width of the core rod 1 is greater than 0.4, which helps to better support the interior of the core rod and increase the heat exchange area.

[0061] As a further solution, the ratio of the total width of the connecting portion 13 to the total width of the core rod 1 is greater than 0.45.

[0062] Among them, the ratio of the width of the (M1+M2-1) / 2th connecting portion 13 to the total width of the core rod 1 is greater than 0.05, which helps to further stabilize the liquid cooling tube structure inside the core rod and optimize the coolant circulation stress.

[0063] As a further solution, the ratio of the width of the (M1+M2-1) / 2th connecting portion 13 to the total width of the core rod 1 is selected from 0.05-0.08.

[0064] Among them, the width ratio of the (M1+M2-1) / 2 root connecting portion 13 to the remaining connecting portions 13 is greater than 1.5. By setting the width ratio of the (M1+M2-1) / 2 root connecting portion 13 to the remaining connecting portions 13 to be greater than 1.5, it is helpful to further optimize the internal stress distribution and enhance the pressure bearing capacity of the core rod.

[0065] As a further solution, the ratio of the width of the (M1+M2-1) / 2th connecting portion 13 to the width of the remaining connecting portions 13 is selected from 1.5-1.8.

[0066] As a further solution, the length ratio of the connecting portion 13 to the core rod 1 is selected from 0.75-0.85. We believe that when the length ratio of the connecting portion 13 to the core rod 1 is 0.7-0.9, it helps to mitigate the impact of the refluxed coolant on the side wall and bottom of the core rod, thereby improving the structural stability of the core rod.

[0067] As a further solution, the ratio of the length of the connecting portion 13 to the core rod 1 is selected from 0.7-0.9. When the ratio of the length of the connecting portion 13 to the core rod 1 is selected from 0.7-0.9, it helps to further reduce the impact of the coolant on the core rod. At the same time, when the ratio of the length of the connecting portion 13 to the core rod 1 is selected from 0.7-0.9, it also helps to further play the guiding role of the connecting portion 13 on the coolant and enhance the heat dissipation effect.

[0068] Wherein, the ratio of the width of the liquid cooling tube 11 to the (M1+M2-1) / 2th connecting portion 13 is selected from 1.5-2.5. The setting of the ratio of the width of the liquid cooling tube 11 to the (M1+M2-1) / 2th connecting portion 13 helps to optimize the force relationship between the flow channel of the liquid cooling tube 11 and the connecting portion 13. When the ratio of the width of the liquid cooling tube 11 to the (M1+M2-1) / 2th connecting portion 13 is selected from 1.5-2.5, it can not only increase the cooling liquid capacity of the liquid cooling tube 11 and increase the heat dissipation contact area, but also use the connecting portion 13 to provide strong support for the core rod 1, thereby avoiding the influence of the liquid cooling tube on the core rod support performance.

[0069] The ratio of the width of the liquid cooling tube 11 to the (M1+M2-1) / 2th connecting portion 13 is selected from 1.8-2.2, which helps to further optimize the stress of the core rod 1 and improve the heat dissipation capacity of the core rod 1.

[0070] The ratio of the total width of the liquid cooling tube 11 to the total width of the core rod 1 is selected from 0.25 to 0.3, which helps to maximize the heat exchange area while ensuring the strength of the core rod.

[0071] As a further solution, when M1+M2-1 is a root connection part 13 and M1+M2-1 is selected from 3-8, it helps to better play the supporting role of the connection part 13 on the core rod, while increasing the heat exchange area and optimizing the heat dissipation effect.

[0072] As a further solution, the core rod 1 has a wall thickness greater than 0.5 mm.

[0073] As a further solution, the wall thickness of the core rod 1 is greater than 0.8 mm.

[0074] As a further solution, the width of the liquid cooling pipe 11 / the total width of the core rod 1 = 0.5, the width of the connecting portion 13 / the width of the liquid cooling pipe 11 = 0.9, and the width of the upward channel 111 or the downward channel 112 is set to be less than 20 mm.

[0075] As a further solution, the core rod 1 is further provided with a first insulating sealing component 16 , on which a sealing card 161 for sealing the upper end of the core rod 1 is provided, and the sealing card 161 is fixedly connected to the upper end of the core rod 1 .

[0076] As a further solution, the first insulating sealing assembly 16 is further provided with an end portion 162 fixedly connected to the battery housing assembly.

[0077] As a further solution, the core rod 1 further includes a second sealing component 19, such as Figure 3 As shown, the second sealing assembly 19 is detachably connected to the lower end of the core rod 1. The provision of the second sealing assembly 19 helps to avoid leakage of the coolant and improve the tightness of the core rod.

[0078] As a further solution, the second sealing member 19 is provided with a sealed liquid inlet 191 and a sealed liquid outlet 192 which match the liquid inlet 14 and the liquid outlet 15 .

[0079] As a further solution, the second sealing member 19 is further provided with a second fixing hole 193 matching with the first fixing hole 18 .

[0080] As a further solution, an outer contour of the contact surface between the second sealing member 19 and the battery housing has an inwardly inclined slope to facilitate the connection between the core rod and the battery housing.

[0081] As a further solution, a first concentric positioning hole 17 is further provided at the midpoint of the lower end of the mandrel 1, and the first concentric positioning hole 17 is located on the (M1+M2-1) / 2th connecting portion 13, and a second concentric positioning hole 163 coaxial with the first concentric positioning hole 17 is provided on the end 162. The coaxially arranged first concentric positioning hole 17 and second concentric positioning hole 163 help to ensure that during the winding process of the winding core, the positive and negative electrodes and the separator can complete the concentric winding movement in unison with the mandrel, so as to obtain a winding core with uniform winding.

[0082] As a further solution, first fixing holes 18 are respectively provided on the outer sides of the liquid inlet 14 and the liquid outlet 15 of the core rod 1, and the first fixing holes 18 are used for fixed connection with the shell assembly.

[0083] In a second aspect, the present invention further provides a liquid-cooled battery, comprising the core rod 1 provided by the present invention.

[0084] In a third aspect, the present invention further provides a method for preparing a core rod 1, comprising the following steps:

[0085] S1: Extruding a metal having a thermal conductivity greater than 100 W / (m·K) to obtain a core rod profile;

[0086] S2: After the core rod profile is divided, the support ribs are removed and the first concentric positioning hole 17 is milled out by CNC milling process to obtain a core rod precursor;

[0087] S3: The first insulating sealing assembly 16 is fixedly connected to the core rod precursor to obtain the core rod 1.

[0088] As a further solution, the metal with a thermal conductivity greater than 100W / (m·K) is selected from any one of an alloy or a single metal with a thermal conductivity greater than 100W / (m·K). Selecting a metal with a thermal conductivity greater than 100W / (m·K) as the core rod raw material helps to fully improve the thermal conductivity of the core rod, thereby improving the heat exchange capacity between the battery cell and the core rod and optimizing the heat dissipation effect.

[0089] As a further solution, the alloy is selected from any one of aluminum alloy and copper alloy, and the single metal is selected from any one of copper, aluminum, beryllium, tungsten, molybdenum and zinc.

[0090] As a further solution, the extrusion ratio of the extrusion molding is selected from 8 to 12, the extrusion temperature is selected from 350 to 500°C, the extrusion speed is selected from 0.5 to 20 m / min, the extrusion tonnage is selected from 500 to 3000 tons, and the cooling speed is selected from 50 to 80°C / min.

[0091] As a further solution, the step of milling out the supporting ribs by a milling machine in S2 is to first fix the core rod 1 profile on the milling machine workbench, and then use a high-speed steel milling cutter to mill out the supporting ribs inside the core rod 1 profile according to the preset linear channel and connection depth and width.

[0092] As a further solution, in S2, the preparation step of the first concentric positioning hole 17 is to mill off the internal supporting ridges of the core rod 1 profile, flip the core rod 1 profile, and mill out the first concentric positioning hole 17 to obtain a liquid-cooled core rod 11 precursor.

[0093] As a further solution, in S2, the temperature of the CNC milling process is selected from 10 to 40°C, the feed speed is selected from 0.05 to 0.5 mm / tooth, and the cutting speed is selected from 50 to 200 m / min.

[0094] As a further solution, the material of the first insulating sealing component 16 in S3 is selected from any one of rubber or plastic. Selecting insulating rubber or plastic as the first insulating sealing component 16 helps to exert the insulating effect of the insulating rubber or plastic, thereby preventing the metal core rod 501 from being charged, thereby preventing the coolant passing through the core rod 501 from being charged or causing a short circuit between the positive and negative poles.

[0095] As a further solution, the rubber is selected from any one of natural rubber, nitrile rubber, chloroprene rubber, silicone rubber, ethylene propylene rubber, butyl rubber, fluororubber, polyurethane rubber, hydrogenated nitrile rubber, and Teflon rubber.

[0096] As a further solution, the plastic is selected from any one of polyvinyl chloride, polyethylene, polypropylene, polystyrene, polycarbonate, polyamide, polyethylene terephthalate, polytetrafluoroethylene, and phenolic resin.

[0097] As a further solution, the method of fixedly connecting the first insulating sealing component 16 and the core rod 1 precursor in S3 is selected from any one of injection molding and crimping.

[0098] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0099] Example 1

[0100] Mandrel preparation:

[0101] S1: Under the conditions of extrusion ratio of 10, extrusion temperature of 400°C, extrusion speed of 10m / min, extrusion tonnage of 1000 tons, and cooling speed of 70°C / min, aluminum is extruded to obtain a core rod profile with a profile thickness of 3mm, a width of 46mm, a liquid cooling channel width of 6.5mm, a liquid cooling pipe thickness of 1.5mm, a support rib width of 2.5mm, and a number of pipes of 4;

[0102] S2: Fix the extruded core rod profile horizontally on the workbench and position it accurately. After cutting the core rod profile into 238mm, fix it upright on the milling machine workbench. At 30°C, with a feed speed of 0.2mm / tooth and a cutting speed of 100m / min, mill off the single-side internal support ribs with a cutting depth of 15mm. Then reverse the core rod and mill out the first concentric positioning hole 17 and the first fixing hole 18 on the other side.

[0103] S3: By injection molding, the first insulating sealing component 16 is fixedly connected to the core rod precursor to obtain the core rod 1.

[0104] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. Although the embodiments of the present invention have been shown and described above, it can be understood that the above-described embodiments are exemplary and cannot be understood as limitations of the present invention. Those of ordinary skill in the art can change, modify, replace and deform the above-described embodiments within the scope of the present invention. In addition, those of ordinary skill in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples without contradiction.

Claims

1. A liquid-cooled mandrel, characterized in that: A plurality of liquid cooling tubes (11) are arranged in the core rod (1), and the liquid cooling tubes (11) include M1 liquid cooling upward channels (111) and M2 liquid cooling downward channels (112) parallel to the central axis of the core rod (1), M1 and M2 are natural numbers greater than 0, and the liquid outlet of each liquid cooling upward channel (111) is connected to the liquid inlet of at least one liquid cooling downward channel (112); the liquid inlet (14) of the M1 liquid cooling upward channel (111) and the liquid outlet (15) of the M2 liquid cooling downward channels (112) are located at the same end of the core rod (1).

2. The liquid-cooled mandrel according to claim 1, characterized in that: The ratio of the total width of the liquid cooling tube (11) to the core rod (1) is greater than 0.

5.

3. The mandrel according to claim 2, characterized in that The ratio of the total width of the liquid cooling tube (11) to the core rod (1) is selected from 0.5-0.

7.

4. The liquid-cooled mandrel according to claim 1, characterized in that: The liquid outlet of the M1 liquid cooling upward channel (111) and the liquid inlet of the M2 liquid cooling downward channel (112) are connected to each other through the liquid cooling turning cavity; The core rod (1) is also provided with M1+M2-1 connecting parts (13) parallel to the central axis of the core rod (1); the connecting parts (13) are fixedly connected to the lower end of the core rod (1) and divide the liquid cooling tube (11) into a liquid cooling upward channel (111) and / or a liquid cooling downward channel (112).

5. The liquid-cooled mandrel according to claim 1, characterized in that: The ratio of the total width of the connecting portion (13) to the total width of the mandrel (1) is greater than 0.4; The ratio of the total width of the connecting portion (13) to the total width of the mandrel (1) is greater than 0.45; The ratio of the width of the (M1+M2-1) / 2th connecting portion (13) to the total width of the core rod (1) is greater than 0.05; The ratio of the (M1+M2-1) / 2th connecting portion (13) to the total width of the core rod (1) is selected from 0.05-0.08; The ratio of the width of the (M1+M2-1) / 2th connecting portion (13) to the width of the remaining connecting portions (13) is greater than 1.5; The ratio of the width of the (M1+M2-1) / 2th connecting portion (13) to the width of the remaining connecting portions (13) is selected from 1.5-1.8; The ratio of the length of the connecting portion (13) to the length of the core rod (1) is selected from 0.75-0.85; The ratio of the length of the connecting portion (13) to the length of the core rod (1) is selected from 0.7-0.9; The ratio of the width of the liquid cooling tube (11) to the (M1+M2-1) / 2th connecting portion (13) is selected from 1.5-2.5; The ratio of the width of the liquid cooling tube (11) to the (M1+M2-1) / 2th connecting portion (13) is selected from 1.8-2.2; The ratio of the total width of the liquid cooling tube (11) to the total width of the core rod (1) is selected from 0.25-0.3; The M1+M2-1 root connection part (13), M1+M2-1 is selected from 3-8; The core rod (1) has a wall thickness greater than 0.5 mm; The wall thickness of the core rod (1) is greater than 0.8 mm; The width of the liquid cooling pipe (11) / the total width of the core rod (1)=0.5, the width of the connecting portion (13) / the width of the liquid cooling pipe (11)=0.9, and the width of the upward channel (111) or the downward channel (112) is set to be less than 20 mm.

6. The mandrel according to claim 4, characterized in that The core rod (1) is also provided with a first insulating sealing component (16), the first insulating sealing component (16) being provided with a sealing card (161) for sealing the upper end of the core rod (1), the sealing card (161) being fixedly connected to the upper end of the core rod (1); The first insulating sealing component (16) is also provided with an end portion (162) fixedly connected to the battery housing component; The mandrel (1) further comprises a second sealing component (19), wherein the second sealing component (19) is detachably connected to the lower end of the mandrel (1); The second sealing member (19) is provided with a sealed liquid inlet (191) and a sealed liquid outlet (192) which match the liquid inlet (14) and the liquid outlet (15); The second sealing member (19) is also provided with a second fixing hole (193) matching with the first fixing hole (18); An inwardly inclined slope area is present on the outer contour of the contact surface between the second sealing member (19) and the housing assembly.

7. The liquid-cooled mandrel according to claim 1, characterized in that: A first concentric positioning hole (17) is also provided at the midpoint of the lower end of the core rod (1), the first concentric positioning hole (17) is located on the (M1+M2-1) / 2th connecting portion (13), and a second concentric positioning hole (163) coaxial with the first concentric positioning hole (17) is provided on the end portion (162).

8. The liquid-cooled mandrel according to claim 1, characterized in that: The outer sides of the liquid inlet (14) and the liquid outlet (15) of the core rod (1) are respectively provided with first fixing holes (18), and the first fixing holes (18) are used for fixed connection with the housing assembly.

9. A liquid-cooled battery, characterized in that: Comprising the mandrel (1) as described in any one of claims 1 to 8.

10. A method for preparing a core rod, characterized in that: The steps include: S1: Extruding a metal having a thermal conductivity greater than 100 W / (m·K) to obtain a core rod profile; S2: After the core rod profile is divided, the support ribs are removed and the first concentric positioning hole (17) is milled out by a CNC milling process to obtain a core rod precursor; S3: fixedly connecting the first insulating sealing component (16) to the core rod precursor to obtain a core rod (1); The metal with a thermal conductivity greater than 100 W / (m·K) is selected from any one of an alloy or a single metal with a thermal conductivity greater than 100 W / (m·K); The alloy is selected from any one of aluminum alloy and copper alloy, and the single metal is selected from any one of copper, aluminum, beryllium, tungsten, molybdenum and zinc; The extrusion ratio of the extrusion molding is selected from 8 to 12, the extrusion temperature is selected from 350 to 500°C, the extrusion speed is selected from 0.5 to 20 m / min, the extrusion tonnage is selected from 500 to 3000 tons, and the cooling speed is selected from 50 to 80°C / min; The step of removing the supporting ribs by milling the milling machine in S2 is firstly to fix the core rod (1) profile on the milling machine workbench, and then to remove the supporting ribs inside the core rod (1) profile by milling the core rod (1) profile according to the preset linear channel and the depth and width of the connection part by a high-speed steel milling cutter; In the above S2, the preparation step of the first concentric positioning hole (17) is to mill off the internal supporting ridges of the core rod (1) profile, flip the core rod (1) profile, and mill out the first concentric positioning hole (17) to obtain a liquid-cooled core rod (1) precursor; In S2, the temperature of the CNC milling process is selected from 10 to 40° C., the feed speed is selected from 0.05 to 0.5 mm / tooth, and the cutting speed is selected from 50 to 200 m / min; The material of the first insulating sealing component (16) in S3 is selected from any one of rubber and plastic; The method for fixedly connecting the first insulating sealing component (16) and the core rod (1) precursor in S3 is selected from any one of injection molding and crimping.

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