CN116487765B - High-integration multi-layer lithium battery pack water-cooling packaging plate and processing method thereof - Google Patents

High-integration multi-layer lithium battery pack water-cooling packaging plate and processing method thereof Download PDF

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Publication number
CN116487765B
CN116487765B CN202310735188.3A CN202310735188A CN116487765B CN 116487765 B CN116487765 B CN 116487765B CN 202310735188 A CN202310735188 A CN 202310735188A CN 116487765 B CN116487765 B CN 116487765B
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cooling
water
plate
layer
battery
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CN116487765A (en
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韩坤
蔡鑫
姬超
安德雷
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Ningbo Qiyun New Material Technology Co ltd
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Ningbo Qiyun New Material Technology Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H01M10/6555—Rods or plates arranged between the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H01M10/6557—Solid parts with flow channel passages or pipes for heat exchange arranged between the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention relates to a high-integration multi-layer lithium battery pack water-cooling packaging plate and a processing method thereof. The novel water flow channel structure is arranged, the partition plate is arranged between the top plate and the bottom plate and plays a role in blocking water flow, so that water flow uniformly flows in the whole water cooling plate layer, a main flow effect is prevented, and cooling dead angles are generated. The water cooling plate is provided with a super-hydrophilic and super-hydrophobic composite material, the groove position is a super-hydrophobic position, and the top of the bulge is a super-hydrophilic position; the super-hydrophobic position can ensure that the deposition and blockage of impurities are reduced when the cooling liquid flows through the super-hydrophobic position, and the water flow channel is prevented from being blocked; meanwhile, the super-hydrophilic position can improve heat exchange between the cooling liquid and the material, and meanwhile, as the super-hydrophilic position has a microstructure of laser irradiation, the specific surface area is increased, and the problem of reduced heat exchange area caused by super-hydrophobicity is solved.

Description

High-integration multi-layer lithium battery pack water-cooling packaging plate and processing method thereof
Technical Field
The invention relates to the field of new energy automobile batteries, in particular to a high-integration multi-layer lithium battery pack water-cooling packaging plate and a processing method thereof.
Background
The problem of battery heating is a key factor in determining its performance, safety, life, and cost of use. First, the temperature level of a lithium ion battery directly affects its energy and power performance in use. At lower temperatures, the available capacity of the battery will decay rapidly, and charging the battery at too low a temperature (e.g., below 0 ℃) may cause transient voltage overcharging, causing internal lithium precipitation and thus short circuiting. Secondly, defects in the production and manufacturing links or improper operation in the using process and the like can cause local overheating of the battery, further cause a chain exothermic reaction, finally cause serious thermal runaway events such as smoking, firing and even explosion and the like, and threaten the life safety of vehicle drivers and passengers. The power battery is enlarged, so that the ratio of the surface area to the volume of the power battery is relatively reduced, the heat in the battery is not easy to dissipate, the problems of uneven internal temperature, overhigh local temperature rise and the like are more likely to occur, the attenuation of the battery is further accelerated, the service life of the battery is shortened, and the use cost of a user is increased.
The Roadster pure electric automobile of Tesla Motors company adopts a liquid cooling type battery thermal management system. The vehicle-mounted battery pack consists of 6831 18650 lithium ion batteries, wherein every 69 lithium ion batteries are connected in parallel to form a group (brick), 9 groups are connected in series to form a layer (sheet), and finally 11 layers are stacked in series. The cooling fluid of the battery thermal management system was a 50% water and 50% glycol mixture as shown in fig. 2.
On one hand, the traditional 18650 battery has low safety coefficient and low energy density; on the other hand, the heat dissipation effect is poor due to the large contact area. Based on the above problems, there is an urgent need to design a high-integration multi-layer lithium battery pack water-cooling package board.
Disclosure of Invention
In order to solve the problems, the invention provides a high-integration multi-layer lithium battery pack water-cooling package board, which comprises a frame, a battery piece layer and a water-cooling board layer.
The battery piece layers and the water-cooling plate layers are mounted together through the frame, and the battery piece layers are distributed on the upper and lower sides of the water-cooling plate layers; the number of the water-cooling plate layers is a single layer; two battery sheet layers are respectively arranged above and below the water cooling plate layer;
a water flow channel is arranged in the water cooling plate layer, and cooling liquid flowing through the water flow channel cools the battery piece layer contacted with the water cooling plate layer;
and a cooling controller is arranged at the frame and controls the flow rate of the cooling liquid according to the heating power of the battery and the temperature of the cooling water.
The water-cooling plate layer consists of a top plate, a bottom plate and a spacing layer; the number of the spacing layers is two, and the spacing layers are respectively attached to the surfaces of the top plate and the bottom plate; the top plate, the interlayer, the water flow channel, the interlayer and the bottom plate are respectively arranged from top to bottom;
the top plate and the bottom plate are made of titanium-magnesium alloy materials; the spacing layer is made of composite polytetrafluoroethylene material;
the shape of the spacing layer is a net shape with square holes, and a distance of 10-15mm is arranged between the two spacing layers, so that the cooling liquid can flow between the spacing layers, meanwhile, as the spacing layer is net shape, the flow of the cooling liquid is blocked by the uneven spacing layer, so that the cooling liquid generates vortex, and further, the cooling liquid and the whole top plate and the whole bottom plate generate heat exchange.
The top plate and the bottom plate are processed by using titanium magnesium alloy plates, secondary laser surface modification treatment is carried out, and then a spacing layer is covered on the surface of the top plate or the bottom plate; the spacer layer covers less than 50% of the surface area.
The cooling controller is connected with the flow rate detection module, the booster pump and the water temperature sensor;
the water temperature sensor comprises a water temperature detection matrix, wherein the water temperature detection matrix is arranged between two spacing layers of the water cooling plate layer and consists of more than 20 temperature probes, and the temperature probes are arranged on the surface of a composite polytetrafluoroethylene material of the spacing layers;
the flow rate detection module is provided with a flow rate detection matrix, the flow rate detection matrix is arranged between two spacer layers of the water cooling plate layer and consists of more than 20 flow rate probes, the flow rate probes are arranged on the surface of the composite polytetrafluoroethylene material of the spacer layers, and the flow rate probes are positioned at the upstream of the temperature probes;
the booster pump is arranged at the cooling liquid inlet of the water cooling plate layer and is used for pressurizing cooling liquid, so that the cooling liquid flow rate is improved.
The cooling controller is connected with a driving computer, and the driving computer is connected with a current and voltage detection module of the battery to obtain the voltage and current of the battery; the driving computer is provided with a power demand calculation module, and the power demand calculation module calculates the heating power P of the battery by using an empirical formula according to the voltage and the current of the battery;
according to an empirical formula, the heating power of the battery is in direct proportion to the current of the battery and in inverse proportion to the voltage of the battery, namely, the lower the voltage is, the larger the current is, and the larger the heating value is;
the driving computer sends heating power to the cooling controller, and the cooling controller calculates a target flow velocity v of the cooling liquid according to the water temperature T and the heating power P of the cooling liquid;
the cooling controller controls the pressurizing pump to regulate pressure and controls the flow rate of the cooling liquid, so that the flow rate of the cooling liquid detected by the flow rate detection module reaches the target flow rate v.
The calculation method of the heating power P comprises the following steps:
P=k·I/U；
where k is a constant coefficient in units of V 2 I is battery current, the unit is A, U is battery voltage, the unit is V, P is heating power of the battery, and the unit is W;
the target flow rate is calculated by the following steps:
v=m·T 2 p; wherein m is a constant coefficient, and the unit is m/(s. DEG C) 2 W), wherein T is the current temperature of the cooling liquid, and the unit is the temperature;
the current temperature T of the cooling liquid is the average temperature of a water temperature detection matrix obtained by a water temperature sensor, and the detection value of the flow rate detection module is the average value of all flow rate probe detection values in the flow rate detection matrix.
A processing method of a multi-layer lithium battery pack water-cooling packaging plate is used for processing the high-integration multi-layer lithium battery pack water-cooling packaging plate and comprises the following steps:
step one, masking a top plate and a bottom plate of a water cooling plate layer, wherein the mask shape is the same as the spacer layer shape, so that the connection between the spacer layer and the top plate and the bottom plate is not affected by laser processing;
step two, placing the top plate and the bottom plate which are well masked under a first laser beam for ablation, wherein the surfaces of the top plate and the bottom plate generate micro-explosion by the ablation, and the surfaces of the top plate and the bottom plate generate super-hydrophilic microstructures by the micro-explosion;
then placing the top plate and the bottom plate subjected to the first laser ablation under a second laser beam for scribing, forming grooves and raised microstructures on the surfaces of the top plate and the bottom plate by scribing, and controlling laser scribing parameters to form a super-hydrophobic structure on the groove positions on the surfaces of the top plate and the bottom plate;
attaching spacer layers to the surfaces of the top plate and the bottom plate, assembling, and installing a flow velocity detection matrix and a water temperature detection matrix; installing a pressurizing pump at the water inlet to finish the manufacture of the water-cooling plate layer;
step four, mounting the battery sheet layers and the water-cooling plate layers together through the frame, wherein the battery sheet layers are distributed on the upper and lower sides of the water-cooling plate layers; the number of the water-cooling plate layers is a single layer;
step five, installing a cooling controller at the frame, wherein the cooling controller controls the flow rate of the cooling liquid according to the heating power of the battery and the cooling water temperature; and a protective layer is arranged outside the battery pack to finish the manufacture of the whole high-integration multi-layer lithium battery pack water-cooling package plate.
In the first step, the black absorption plate is selected as the mask material, the absorption rate of the absorption plate to the first laser beam and the second laser beam is more than 95%, and the energy of the first laser beam and the second laser beam can not damage the black absorption plate.
The first laser beam in the second step selects ultraviolet laser with the wavelength of 248nm and the spot size of 5 cm 2 To 10cm 2 Pulse laser is adopted, the pulse frequency is 500Hz, the single pulse energy is 1000J to 3000J, and an irradiation mode is adopted;
the second laser beam selects 1064nm femtosecond pulse laser with the laser power of 500W to 1 kW; scribing in a focusing mode, wherein the laser spot is below 50 mu m; scribing pitch 100 μm; scribing by adopting grids;
thus, the surface of the top plate and the bottom plate forms an integral super-hydrophobic composite microstructure, namely the groove super-hydrophobic composite microstructure, and the top of the bulge (10) microstructure is super-hydrophilic; the microstructure scale on top of the raised microstructure is on the order of 10 nm.
The spacer layer is made of a composite polytetrafluoroethylene material, and the polytetrafluoroethylene content in the composite polytetrafluoroethylene material is more than 85%.
The beneficial effects of the invention are as follows:
the invention has high structural integration level, simple structure, good cooling effect and high safety.
The novel water flow channel structure is arranged, the partition plate is arranged between the top plate and the bottom plate and plays a role in blocking water flow, so that water flow uniformly flows in the whole water cooling plate layer, a main flow effect is prevented, and cooling dead angles are generated.
The water cooling plate is provided with a super-hydrophilic and super-hydrophobic composite material, the groove position is a super-hydrophobic position, and the top of the bulge is a super-hydrophilic position; the super-hydrophobic position can ensure that the deposition and blockage of impurities are reduced when the cooling liquid flows through the super-hydrophobic position, and the water flow channel is prevented from being blocked; meanwhile, the super-hydrophilic position can improve heat exchange between the cooling liquid and the material, and meanwhile, as the super-hydrophilic position has a microstructure of laser irradiation, the specific surface area is increased, and the problem of reduced heat exchange area caused by super-hydrophobicity is solved.
Meanwhile, on one hand, the micro structure of the super-hydrophilic position is at the level of 10nm, so that impurities are not easy to accumulate, and on the other hand, even if the impurities accumulate, the accumulation can lead to the reduction of the super-hydrophilic effect, so that the accumulation effect is also reduced, namely, the accumulation can be stopped after the impurities accumulate to a certain degree; further reducing the problem of blockage in the coolant flow passage.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall architecture of the present invention;
FIG. 2 is a schematic diagram of a prior art solution;
FIG. 3 is an exploded view of the structure of the water-cooled package plate of the present invention;
FIG. 4 is a side view of a water-cooled package board structure according to the present invention;
FIG. 5 is a schematic view of the structure of the water-cooled slab layer of the present invention;
FIG. 6 is a schematic side view of a top plate of the water-cooled plate layer of the present invention;
FIG. 7 shows a micrograph of the hydrophobic and hydrophilic structures of the present invention, the left one shows a micrograph of the structures drawn during processing, the middle one shows a micrograph of the structures drawn with horizontal and vertical lines, and the right one shows a high resolution micrograph of the raised positions.
Detailed Description
Example 1
In the prior art, a liquid-cooled battery thermal management system is adopted by a Roader pure electric automobile of Tesla Motors company. The vehicle-mounted battery pack consists of 6831 18650 lithium ion batteries, wherein every 69 lithium ion batteries are connected in parallel to form a group (brick), 9 groups are connected in series to form a layer (sheet), and finally 11 layers are stacked in series. The cooling fluid of the battery thermal management system was a 50% water and 50% glycol mixture as shown in fig. 2.
According to the technical scheme, referring to fig. 1 and 3-6, the high-integration multi-layer lithium battery pack water-cooling package board comprises a frame 1, a battery sheet layer 2 and a water-cooling board layer 3.
The battery sheet layer 2 and the water cooling plate layer 3 are mounted together through the frame 1, and the battery sheet layer 2 is distributed on the upper and lower sides of the water cooling plate layer 3; the number of the water-cooling plate layers 3 is a single layer; two battery piece layers 2 are respectively arranged above and below the water-cooling plate layer 3;
a water flow channel 4 is arranged in the water cooling plate layer 3, and cooling liquid flowing through the water flow channel 4 cools the battery piece layer 2 contacted with the water cooling plate layer 3;
a cooling controller 5 is arranged at the frame 1, and the cooling controller 5 controls the flow rate of the cooling liquid according to the heating power of the battery and the temperature of the cooling water.
The water-cooling plate layer 3 is composed of a top plate 6, a bottom plate 7 and a spacing layer 8; the number of the spacing layers 8 is two, and the spacing layers are respectively attached to the surfaces of the top plate 6 and the bottom plate 7; from top to bottom, a top plate 6, a interlayer 8, a water flow channel, another interlayer 8 and a bottom plate 7 are respectively arranged;
the top plate 6 and the bottom plate 7 are made of titanium-magnesium alloy materials; the spacing layer 8 is made of composite polytetrafluoroethylene material;
the shape of the spacing layer 8 is a net shape with square holes, and a distance of 10-15mm is arranged between the two spacing layers 8, so that the cooling liquid can flow between the spacing layers 8, meanwhile, as the spacing layers 8 are net-shaped, the uneven of the spacing layers 8 plays a role in blocking the flow of the cooling liquid, so that the cooling liquid generates vortex, and further the cooling liquid and the whole top plate 6 and the whole bottom plate 7 generate heat exchange.
The top plate 6 and the bottom plate 7 are processed by using titanium magnesium alloy plates, and are subjected to secondary laser surface modification treatment, and then a spacing layer 8 is covered on the surface of the top plate 6 or the bottom plate 7; the spacer layer 8 covers less than 50% of the surface area.
The cooling controller 5 is connected with the flow rate detection module, the booster pump and the water temperature sensor;
the water temperature sensor comprises a water temperature detection matrix, wherein the water temperature detection matrix is arranged between two spacing layers 8 of the water cooling plate layer 3 and consists of more than 20 temperature probes, and the temperature probes are arranged on the surface of a composite polytetrafluoroethylene material of the spacing layers 8;
the flow rate detection module is provided with a flow rate detection matrix, the flow rate detection matrix is arranged between two spacing layers 8 of the water cooling plate layer 3 and consists of more than 20 flow rate probes, the flow rate probes are arranged on the surface of the composite polytetrafluoroethylene material of the spacing layers 8, and the flow rate probes are positioned at the upstream of the temperature probes;
the pressurizing pump is arranged at the cooling liquid inlet of the water cooling plate layer 3 and is used for pressurizing the cooling liquid, so that the cooling liquid flow rate is improved.
The cooling controller 5 is connected with a traveling crane computer, and the traveling crane computer is connected with a current and voltage detection module of the battery to obtain the voltage and current of the battery; the driving computer is provided with a power demand calculation module, and the power demand calculation module calculates the heating power P of the battery by using an empirical formula according to the voltage and the current of the battery;
according to an empirical formula, the heating power of the battery is in direct proportion to the current of the battery and in inverse proportion to the voltage of the battery, namely, the lower the voltage is, the larger the current is, and the larger the heating value is;
the driving computer sends heating power to the cooling controller 5, and the cooling controller 5 calculates a target flow velocity v of the cooling liquid according to the water temperature T and the heating power P of the cooling liquid;
the cooling controller 5 controls the pressurizing pump to adjust the pressure and controls the flow rate of the cooling liquid so that the flow rate of the cooling liquid detected by the flow rate detection module reaches the target flow rate v.
The calculation method of the heating power P comprises the following steps:
P=k·I/U；
where k is a constant coefficient in units of V 2 I is battery current, the unit is A, U is battery voltage, the unit is V, P is heating power of the battery, and the unit is W;
the target flow rate is calculated by the following steps:
v=m·T 2 p; wherein m is a constant coefficient, and the unit is m/(s. DEG C) 2 W), wherein T is the current temperature of the cooling liquid, and the unit is the temperature;
the current temperature T of the cooling liquid is the average temperature of a water temperature detection matrix obtained by a water temperature sensor, and the detection value of the flow rate detection module is the average value of all flow rate probe detection values in the flow rate detection matrix.
Example 2
A processing method of a multi-layer lithium battery pack water-cooling packaging plate is used for processing the high-integration multi-layer lithium battery pack water-cooling packaging plate and comprises the following steps:
step one, masking the top plate 6 and the bottom plate 7 of the water-cooling plate layer 3, wherein the mask shape is the same as the shape of the spacing layer 8, so that the connection between the spacing layer 8 and the top plate 6 and the bottom plate 7 is not affected by laser processing;
step two, placing the top plate 6 and the bottom plate 7 which are well masked under a first laser beam for ablation, wherein the surfaces of the top plate 6 and the bottom plate 7 generate micro-explosions through the ablation, and the surfaces of the top plate 6 and the bottom plate 7 generate super-hydrophilic microstructures through the micro-explosions;
then placing the top plate 6 and the bottom plate 7 subjected to the first laser ablation under a second laser beam for scribing, forming microstructures of grooves 9 and protrusions 10 on the surfaces of the top plate 6 and the bottom plate 7 by scribing, and controlling laser scribing parameters to form a super-hydrophobic structure on the positions of the grooves 9 on the surfaces of the top plate 6 and the bottom plate 7;
attaching a spacer layer 8 to the surfaces of the top plate 6 and the bottom plate 7, assembling, and installing a flow velocity detection matrix and a water temperature detection matrix; installing a pressurizing pump at the water inlet to finish the manufacture of the water-cooling plate layer 3;
step four, mounting the battery sheet layers 2 and the water-cooling plate layers 3 together through the frame 1, wherein the battery sheet layers 2 are distributed on the upper and lower sides of the water-cooling plate layers 3; the number of the water-cooling plate layers 3 is a single layer;
step five, installing a cooling controller 5 at the frame 1, wherein the cooling controller 5 controls the flow rate of the cooling liquid according to the heating power of the battery and the cooling water temperature; and a protective layer is arranged outside the battery pack to finish the manufacture of the whole high-integration multi-layer lithium battery pack water-cooling package plate.
In the first step, the black absorption plate is selected as the mask material, the absorption rate of the absorption plate to the first laser beam and the second laser beam is more than 95%, and the energy of the first laser beam and the second laser beam can not damage the black absorption plate.
The first laser beam in the second step selects ultraviolet laser with the wavelength of 248nm and the spot size of 5 cm 2 To 10cm 2 Pulse laser is adopted, the pulse frequency is 500Hz, the single pulse energy is 1000J to 3000J, and an irradiation mode is adopted;
the second laser beam selects 1064nm femtosecond pulse laser with the laser power of 500W to 1 kW; scribing in a focusing mode, wherein the laser spot is below 50 mu m; scribing pitch 100 μm; scribing by adopting grids;
thereby forming an overall superhydrophobic, i.e. groove superhydrophobic, composite microstructure with superhydrophilic top of the microstructure of the protrusion 10 on the surfaces of the top plate 6 and the bottom plate 7; the microstructure scale on top of the bump 10 microstructure is on the order of 10 nm.
As shown in fig. 7, the groove position is a superhydrophobic position, and the top of the protrusion is a superhydrophilic position; the super-hydrophobic position can ensure that the deposition and blockage of impurities are reduced when the cooling liquid flows through the super-hydrophobic position, and the water flow channel is prevented from being blocked; meanwhile, the super-hydrophilic position can improve heat exchange between the cooling liquid and the material, and meanwhile, as the super-hydrophilic position has a microstructure of laser irradiation, the specific surface area is increased, and the problem of reduced heat exchange area caused by super-hydrophobicity is solved.
Meanwhile, on one hand, the micro structure of the super-hydrophilic position is at the level of 10nm, so that impurities are not easy to accumulate, and on the other hand, even if the impurities accumulate, the accumulation can lead to the reduction of the super-hydrophilic effect, so that the accumulation effect is also reduced, namely, the accumulation can be stopped after the impurities accumulate to a certain degree; further reducing the problem of blockage in the coolant flow passage.
The spacer layer 8 is made of a composite polytetrafluoroethylene material, wherein the polytetrafluoroethylene content in the composite polytetrafluoroethylene material is more than 85%.
The description of the foregoing embodiments has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to the particular embodiment, but, where applicable, may be interchanged and used with the selected embodiment even if not specifically shown or described. The same elements or features may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those skilled in the art. Numerous details are set forth, such as examples of specific parts, devices, and methods, in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to one skilled in the art that the exemplary embodiments may be embodied in many different forms without the use of specific details, and neither should be construed to limit the scope of the disclosure. In certain example embodiments, well-known processes, well-known device structures, and well-known techniques are not described in detail.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises" and "comprising" are inclusive and, therefore, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed and illustrated, unless specifically indicated. It should also be appreciated that additional or alternative steps may be employed.

Claims (4)

1. A processing method of a multi-layer lithium battery pack water-cooling packaging plate is used for processing a high-integration multi-layer lithium battery pack water-cooling packaging plate and is characterized in that:
the pack water-cooling packaging board of the multi-layer lithium battery with high integration level comprises a frame (1), a battery piece layer (2) and a water-cooling board layer (3);
the battery piece layer (2) and the water-cooling plate layer (3) are mounted together through the frame (1), and the battery piece layer (2) is distributed on the water-cooling plate layer (3) vertically; the number of the water-cooling plate layers (3) is a single layer; two battery sheet layers (2) are respectively arranged above and below the water-cooling plate layer (3);
a water flow channel (4) is arranged in the water cooling plate layer (3), and cooling liquid flowing through the water flow channel (4) cools the battery piece layer (2) contacted with the water cooling plate layer (3);
a cooling controller (5) is arranged at the frame (1), and the cooling controller (5) controls the flow rate of the cooling liquid according to the heating power of the battery and the temperature of the cooling water;
the water-cooling plate layer (3) consists of a top plate (6), a bottom plate (7) and a spacing layer (8); the number of the spacing layers (8) is two, and the spacing layers are respectively attached to the surfaces of the top plate (6) and the bottom plate (7); the top plate (6), one interlayer (8), a water flow channel, the other interlayer (8) and the bottom plate (7) are arranged from top to bottom respectively;
the top plate (6) and the bottom plate (7) are made of titanium-magnesium alloy materials; the spacing layer (8) is made of composite polytetrafluoroethylene material;
the shape of each spacer layer (8) is a net shape with square holes, and a distance of 10-15mm is arranged between the two spacer layers (8), so that cooling liquid can flow between the spacer layers (8), meanwhile, as the spacer layers (8) are net shapes, the uneven of the spacer layers (8) can block the flow of the cooling liquid, so that the cooling liquid generates vortex, and further, the cooling liquid exchanges heat with the whole top plate (6) and the whole bottom plate (7);
the top plate (6) and the bottom plate (7) are processed by using titanium magnesium alloy plates, and are subjected to secondary laser surface modification treatment, and then a spacing layer (8) is covered on the surface of the top plate (6) or the bottom plate (7); the surface area covered by the spacing layer (8) is less than 50%;
the cooling controller (5) is connected with the flow rate detection module, the booster pump and the water temperature sensor;
the water temperature sensor comprises a water temperature detection matrix, wherein the water temperature detection matrix is arranged between two spacing layers (8) of the water cooling plate layer (3) and consists of more than 20 temperature probes, and the temperature probes are arranged on the surface of a composite polytetrafluoroethylene material of the spacing layers (8);
the flow rate detection module is provided with a flow rate detection matrix, the flow rate detection matrix is arranged between two spacing layers (8) of the water cooling plate layer (3) and consists of more than 20 flow rate probes, the flow rate probes are arranged on the surface of the composite polytetrafluoroethylene material of the spacing layers (8), and the flow rate probes are positioned at the upstream of the temperature probes;
the pressurizing pump is arranged at the cooling liquid inlet of the water cooling plate layer (3) and is used for pressurizing cooling liquid, so that the cooling liquid flow rate is improved;
the cooling controller (5) is connected with a driving computer, and the driving computer is connected with a current and voltage detection module of the battery to obtain the voltage and current of the battery; the driving computer is provided with a power demand calculation module, and the power demand calculation module calculates the heating power P of the battery by using an empirical formula according to the voltage and the current of the battery;
according to an empirical formula, the heating power of the battery is in direct proportion to the current of the battery and in inverse proportion to the voltage of the battery, namely, the lower the voltage is, the larger the current is, and the larger the heating value is;
the driving computer sends heating power to the cooling controller (5), and the cooling controller (5) calculates a target flow velocity v of the cooling liquid according to the water temperature T and the heating power P of the cooling liquid;
the cooling controller (5) controls the pressure pump to regulate pressure and controls the flow rate of the cooling liquid, so that the flow rate of the cooling liquid detected by the flow rate detection module reaches a target flow rate v;
the processing method comprises the following steps:
step one, masking a top plate (6) and a bottom plate (7) of the water-cooling plate layer (3), wherein the mask shape is the same as the shape of the spacing layer (8), so that the connection between the spacing layer (8) and the top plate (6) and the bottom plate (7) is not affected by laser processing;
step two, placing the top plate (6) and the bottom plate (7) which are well masked under a first laser beam for ablation, wherein the ablation enables the surfaces of the top plate (6) and the bottom plate (7) to generate micro-explosions, and the micro-explosions enable the surfaces of the top plate (6) and the bottom plate (7) to generate super-hydrophilic microstructures;
then placing the top plate (6) and the bottom plate (7) subjected to the first laser ablation under a second laser beam for scribing, forming microstructures of grooves (9) and protrusions (10) on the surfaces of the top plate (6) and the bottom plate (7), and controlling laser scribing parameters to form a super-hydrophobic structure at the positions of the grooves (9) on the surfaces of the top plate (6) and the bottom plate (7);
attaching a spacer layer (8) to the surfaces of the top plate (6) and the bottom plate (7), assembling, and installing a flow velocity detection matrix and a water temperature detection matrix; installing a pressurizing pump at the water inlet to finish the manufacture of the water-cooling plate layer (3);
step four, mounting the battery sheet layers (2) and the water-cooling plate layers (3) together through the frame (1), wherein the battery sheet layers (2) are distributed on the water-cooling plate layers (3) vertically; the number of the water-cooling plate layers (3) is a single layer;
step five, installing a cooling controller (5) at the frame (1), wherein the cooling controller (5) controls the flow rate of cooling liquid according to the heating power of the battery and the cooling water temperature; and a protective layer is arranged outside the battery pack to finish the manufacture of the whole high-integration multi-layer lithium battery pack water-cooling package plate.
2. The processing method according to claim 1, characterized in that:
in the first step, the black absorption plate is selected as the mask material, the absorption rate of the absorption plate to the first laser beam and the second laser beam is more than 95%, and the energy of the first laser beam and the second laser beam can not damage the black absorption plate.
3. The processing method according to claim 2, characterized in that:
the first laser beam in the second step selects ultraviolet laser with the wavelength of 248nm and the spot size of 5 cm 2 To 10cm 2 Pulse laser is adopted, the pulse frequency is 500Hz, the single pulse energy is 1000J to 3000J, and an irradiation mode is adopted;
the second laser beam selects 1064nm femtosecond pulse laser with the laser power of 500W to 1 kW; scribing in a focusing mode, wherein the laser spot is below 50 mu m; scribing pitch 100 μm; scribing by adopting grids;
the surface of the top plate (6) and the surface of the bottom plate (7) form integral super-hydrophobic, namely super-hydrophobic grooves, and super-hydrophilic composite microstructures are arranged on the tops of the microstructures of the protrusions (10); the microstructure scale on top of the bump (10) microstructure is on the order of 10 nm.
4. A method of processing according to claim 3, wherein:
the spacing layer (8) is made of composite polytetrafluoroethylene material, and the content of polytetrafluoroethylene in the composite polytetrafluoroethylene material is more than 85 percent.
CN202310735188.3A 2023-06-20 2023-06-20 High-integration multi-layer lithium battery pack water-cooling packaging plate and processing method thereof Active CN116487765B (en)

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