An intelligent battery module with an automatic temperature control function

Abstract

The present invention discloses an intelligent battery module with an automatic temperature control function, which includes a housing assembly; two battery cell assemblies arranged in parallel in the housing assembly, with an air duct provided therebetween; a plurality of ventilation plates respectively and tightly attached between adjacent battery cells; a sealing plate hermetically arranged on the air duct; a plurality of temperature-controlled air volume membranes respectively arranged outside the corresponding ventilation plates; an intelligent control fan assembly penetrating through the housing assembly and connected to the air duct in a communicating manner; an intelligent control module and a battery management system respectively fixedly arranged in the housing assembly. The present invention performs uniform cooling operations on multiple battery cells through the cooperation of the temperature-controlled air volume membranes, ventilation plates, air ducts, sealing plates and intelligent control fan assemblies. At the same time, the intelligent control module realizes warning operations through AI training, effectively solving the problems of large temperature differences between the upper and lower parts of the battery cells in the existing battery module and the lack of intelligent control of the battery cells.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and more particularly, to an intelligent battery module with an automatic temperature control function. Background Art

[0002] At present, a battery module is formed by connecting multiple battery cells in series or in parallel. The heat generated during the continuous cyclic charge and discharge of multiple battery cells will accumulate and increase in temperature. The sensitivity of the battery to temperature and temperature difference directly limits the charge and discharge cycle times and charge and discharge rates of the battery module. Generally, only low-rate charge and discharge or reduction of cycle times can be used to alleviate the sharp rise in the internal temperature and temperature difference of the battery module. How to better control the temperature and temperature difference of the battery module while improving the charge and discharge efficiency is a major technical challenge for the energy storage industry.

[0003] In the existing air-cooled battery module, multiple battery cells and front and rear end caps are mainly bundled together by steel strips. Generally, rubber strips are used to isolate air ducts between the battery cells. The bundled battery cell group is placed in a sheet metal housing, and waist-shaped side ventilation holes are opened on both sides of the housing. The battery cell group is fixed to the bottom support plate by end cap locking. The positive and negative electrodes between the battery cells are connected by welding with aluminum bars. When the fan is turned on, the outside air converges from the gaps between the battery cells to the middle air duct, and then flows out of the box body together from the middle air duct to the axial flow fan, completing a heat dissipation cycle. However, the temperature difference of this air-cooled heat dissipation method is relatively large, and the open air duct cannot form a negative pressure in a specified path. After the outside air enters the ventilation holes of the sheet metal housing, a large amount of air will flow to the axial flow fan on the surface of the aluminum bar with lower air resistance, so that the air volume flowing through the large surface gap of the battery cell decreases, and the temperature of the battery cell cannot be well heat exchanged, resulting in the inability to control the temperature difference and temperature rise. On the other hand, the current battery module does not automatically confirm and adjust the voltage consistency before the charge and discharge are turned on, resulting in high heat consumption and temperature rise of the battery module, and the battery life also drops severely. Therefore, an intelligent battery module with an automatic temperature control function is provided to solve the above problems. Summary of the Invention

[0004] One of the purposes of the present invention is to provide an intelligent battery module with an automatic temperature control function to solve the problems of large temperature difference between the upper and lower parts of the battery cells in the existing battery module and the lack of intelligent control of the battery cells.

[0005] An intelligent battery module with an automatic temperature control function according to the present invention can be realized by the following technical solutions:

[0006] An intelligent battery module with an automatic temperature control function according to the present invention includes a housing assembly; two battery cell assemblies, which are arranged in parallel in the housing assembly and there is an air duct between the two battery cell assemblies. The battery cell assembly includes a plurality of battery cells arranged in a straight line in sequence, and adjacent two of the battery cells are electrically connected by an aluminum row; a plurality of ventilation plates, which are respectively closely attached between adjacent two of the battery cells, and ventilation holes are penetrated in the ventilation plates; a sealing plate, which is hermetically arranged on the air duct; a plurality of temperature-controlled air volume membranes, which are respectively arranged outside the corresponding ventilation plates, and the temperature-controlled air volume membranes have different degrees of pore ventilation rates according to the change of temperature; an intelligent control fan assembly, which is penetrated in the housing assembly and is connected to the air duct in communication; an intelligent control module, which is fixedly arranged in the housing assembly, and the intelligent control module obtains the predicted center temperature of the battery cells, the trend curve of the battery cell parameters and the battery cell parameters during the actual charge and discharge process through AI comprehensive training; a battery management system, which is fixedly arranged in the housing assembly, and the battery management system is electrically connected to the two battery cell assemblies, the intelligent control fan assembly and the intelligent control module respectively.

[0007] In one implementation manner, an intelligent battery module with an automatic temperature control function according to the present invention further includes a phase change heat conduction assembly, and the phase change heat conduction assembly is arranged on a plurality of the aluminum rows, and the heat of the aluminum rows is transferred to the corresponding ventilation plates through the phase change heat conduction assembly.

[0008] In one implementation manner, the phase change heat conduction assembly includes a fence, which is fixedly arranged in the housing assembly and wraps the two battery cell assemblies, and there is a gap between the phase change heat conduction assembly and a plurality of the aluminum rows; a phase change filler arranged between a plurality of the aluminum rows and the inner wall of the fence, and the phase change filler uses a solid-liquid phase change material.

[0009] In one implementation manner, the housing assembly includes a corrugated bottom plate and a main housing fixedly arranged on the corrugated bottom plate; the corrugated bottom plate includes three layers of stainless steel thin plates arranged in sequence, the upper and lower layers are respectively stainless steel thin plates with high flatness, and the middle layer is a corrugated stainless steel thin plate.

[0010] In one implementation manner, a heat conduction and temperature equalization film is arranged between the corrugated bottom plate and the two battery cell assemblies, and the heat conduction and temperature equalization film uses a graphene composite material.

[0011] In one implementation manner, a plurality of reinforcing ribs are equidistantly arranged in the ventilation holes of the ventilation plate, and the wall thickness of the ventilation holes and the thickness of the reinforcing ribs are designed through force simulation.

[0012] In one of the embodiments, the temperature-controlled air volume film is made of a temperature-sensitive material, which includes a plurality of fine ventilation pores evenly distributed. At normal temperature, the pores are in a closed state and do not ventilate.

[0013] In one of the embodiments, the temperature-sensitive curvature of the temperature-controlled air volume film is as follows: when the surface temperature of the corresponding battery cell reaches 30 °C, the temperature-controlled air volume film curves towards the inner arc surface, and the ventilation rate of the opened pores at this time is 25%; when the surface temperature of the corresponding battery cell reaches 33 °C, the temperature-controlled air volume film curves towards the inner arc surface, and the ventilation rate of the opened pores at this time is 30%; when the surface temperature of the corresponding battery cell reaches 35 °C, the temperature-controlled air volume film curves towards the inner arc surface, and the ventilation rate of the opened pores at this time is 45%; when the surface temperature of the corresponding battery cell reaches 36 °C, the temperature-controlled air volume film curves towards the inner arc surface, and the ventilation rate of the opened pores at this time is 70%; when the surface temperature of the corresponding battery cell reaches 37 °C, the temperature-controlled air volume film curves towards the inner arc surface, and the ventilation rate of the opened pores at this time is 80%; when the surface temperature of the corresponding battery cell reaches 38 °C, the temperature-controlled air volume film curves towards the inner arc surface, and the ventilation rate of the opened pores at this time is 95%.

[0014] In one of the embodiments, the intelligent control fan assembly includes a wind guide cover, which is communicatively arranged on one side of the air duct; an intelligent control fan fixedly and penetratingly arranged on the housing assembly and connected to the wind guide cover. The intelligent control fan uses an axial-flow fan, and its motor uses a continuous variable frequency speed regulation motor without breakpoints.

[0015] In one of the embodiments, the AI training method of the intelligent control module is as follows:

[0016] S1. Establish an electrochemical simulation model of a single battery cell, and obtain the change curve of the theoretical parameters of the battery cell through transient simulation of cyclic charge and discharge;

[0017] S2, build a single cell test environment consistent with the working conditions of the electrochemical simulation model, arrange the single cell parameter collection and communication with the intelligent control module, carry out a large number of cyclic charge and discharge tests, derive the collectible parameter curve of the cell after the test, compare the collectible parameter curve of the test with the parameter curve corresponding to the electrochemical simulation, if the curve coincidence deviation between the electrochemical simulation and the actual test is within ±2%, it is considered that the simulation parameters are approximately consistent with the actual test parameters, then the parameter curve that cannot be directly collected in the actual test can directly refer to the corresponding electrochemical simulation parameter curve, and the non-collectible parameters can be imported into the intelligent control module by borrowing electrochemical simulation parameter data and curves; if the curve coincidence between the electrochemical simulation and the actual test is greater than ±2%, first check the curve coincidence rate of multiple cycle charge and discharge of the cell under the same working conditions, if the consistency of the multiple cycle test curves is less than ±2%, directly correct the inherent boundary conditions of the electrochemical simulation cell itself and then perform simulation calculation, and iterate the simulation in the same way until the collectible data curve obtained by the electrochemical simulation coincides with the test data curve The deviation is within ±2%;

[0018] S3, install the intelligent control module that has been trained by single cell simulation and test big data into the shell assembly and electrically connect and communicate with the battery management system, collect the curve offset of the cell parameters in real time during the charging and discharging process of the intelligent battery module, and when the offset of a parameter curve is greater than ±2%, issue a corresponding alarm signal or send a signal instruction to suspend charging and discharging to the battery management system to execute or predict faults.

[0019] Compared with the prior art, the intelligent battery module with automatic temperature control function of the present invention has the following beneficial effects:

[0020] The intelligent battery module with automatic temperature control function of the present invention forms a sealed circulation heat dissipation channel through the cooperation of a temperature control air volume membrane, a ventilation plate, an air duct, a sealing plate and an intelligent control fan component, so as to evenly cool down multiple battery cells, so that the temperature difference between the upper and lower parts of the battery cells is small. At the same time, by arranging a phase change heat conductive component above the aluminum row, the heat of the aluminum row is transferred to the corresponding ventilation plate through the phase change heat conductive component for heat dissipation. At the same time, the temperature of the top of the battery cell can be better reduced, and the problem of large temperature difference between the upper and lower parts of the battery cell in the existing battery module is effectively solved; by designing a set of comprehensive AI intelligent control, the problem of lack of intelligent control of the battery cell in the existing battery module is effectively solved;

[0021] An intelligent battery module with an automatic temperature control function according to the present invention can accurately monitor the surface temperature of the battery cells by providing a temperature sensing film on the side of each battery cell; by designing the bottom of the battery module with a corrugated structure, weight reduction is achieved while maintaining the same load-bearing capacity, high flatness, effective absorption of vibration during transportation, and the solder joints of the aluminum busbars are not easily loosened; the aluminum busbars are encapsulated with a phase change material to enhance the heat dissipation, temperature uniformity, and insulation of the aluminum busbars, significantly extending the service life of the solder joints of the aluminum busbars; the intelligent control fan achieves high-precision, fast, and flexible control according to multi-dimensional parameters, making the battery module safer and more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is a top view structural schematic diagram of an intelligent battery module with an automatic temperature control function according to the present invention;

[0024] Figure 2 is a side view structural schematic diagram of an intelligent battery module with an automatic temperature control function according to the present invention;

[0025] Figure 3 is a partial structure enlarged view of an intelligent battery module with an automatic temperature control function according to the present invention.

[0026] Reference numerals in the drawings: 10, intelligent battery module; 11, housing assembly; 111, corrugated bottom plate; 112, main housing; 12, battery cell assembly; 121, battery cell; 122, aluminum busbar; 123, end cover; 124, steel strip; 13, ventilation plate; 131, reinforcing rib; 14, sealing plate; 15, phase change heat conduction assembly; 151, enclosure; 152, phase change filler; 16, temperature control air volume film; 17, intelligent control fan assembly; 171, air guide cover; 172, intelligent control fan; 18, battery management system; 19, intelligent control module; 20, heat conduction and temperature uniformity film. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Accordingly, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0029] Please refer to Figures 1 - 3 As shown, an intelligent battery module 10 with an automatic temperature control function of the present invention includes a housing assembly 11, two battery cell assemblies 12, a plurality of ventilation plates 13, a sealing plate 14, a phase change heat conduction assembly 15, a plurality of temperature-controlled air volume membranes 16, an intelligent control fan assembly 17, a battery management system 18, and an intelligent control module 19; the housing assembly 11 is a hollow cavity; the two battery cell assemblies 12 are arranged in parallel in the housing assembly 11, and a wind channel is provided between the two battery cell assemblies 12. The battery cell assembly 12 includes a plurality of battery cells 121 arranged in a straight line in sequence, and adjacent two battery cells 121 are electrically connected through an aluminum row 122; a plurality of ventilation plates 13 are respectively closely attached between adjacent two battery cells 121, and ventilation holes are provided through the ventilation plates 13. Cold air in the external environment brings the heat generated by the battery cells 121 on both sides of the ventilation plate 13 into the wind channel through the ventilation holes, so as to dissipate heat from the battery cells 121; the sealing plate 14 is hermetically arranged on the wind channel between adjacent two battery cell assemblies 12 to seal the wind channel; the phase change heat conduction assembly 15 is arranged on a plurality of aluminum rows 122, and the heat of the aluminum rows 122 is transferred to the corresponding ventilation plate 13 through the phase change heat conduction assembly 15 for heat dissipation operation, and at the same time, it can also better reduce the temperature at the top of the battery cells 121; a plurality of temperature-controlled air volume membranes 16 are respectively arranged on the outer sides of the corresponding ventilation plates 13, and the temperature-controlled air volume membranes 16 perform ventilation operations to different degrees according to temperature changes; the intelligent control fan assembly 17 is arranged through the housing assembly 11 and is connected in communication with the wind channel between the two battery cell assemblies 12. It generates a certain negative pressure in the wind channel between the two battery cell assemblies 12, forcing cold air in the external environment to quickly enter the wind channel from the ventilation holes of the plurality of ventilation plates 13, and at the same time discharging the high-temperature air inside the housing assembly 11 to the external environment to realize the heat dissipation operation of the intelligent battery module 10; the battery management system 18 and the intelligent control module 19 are respectively arranged in the housing assembly 11. The battery management system 18 is respectively electrically connected to the two battery cell assemblies 12, the intelligent control fan assembly 17, and the intelligent control module 19. The charging and discharging of the two battery cell assemblies 12 and the intelligent control fan assembly 17 are respectively controlled through the battery management system 18. The intelligent control module 19 obtains the predicted center temperature of the battery cells, the trend curve of battery cell parameters, and the battery cell parameters during the actual charging and discharging process through AI comprehensive training, playing a prediction role within a certain accuracy range and the function of early warning of abnormal parameters, thereby largely avoiding the safety risks of the intelligent battery module 10.

[0030] Please refer toFigures 1 - 3 As shown, in this embodiment, the housing assembly 11 includes a corrugated bottom plate 111 and a main housing 112; the main housing 112 is a hollow cavity with one end open, and it is fixedly arranged on the corrugated bottom plate 111 to form a sealed cavity, and two battery cell assemblies 12 are respectively fixedly arranged in this cavity. Specifically, the corrugated bottom plate 111 includes three layers of stainless steel thin plates arranged in sequence. The upper and lower layers are stainless steel thin plates with high flatness, and the middle layer is a corrugated stainless steel thin plate. The three are welded together by reflow soldering; an insulating layer is sprayed on the surface of the stainless steel thin plate, which has a high load-bearing effect and is light in weight; a plurality of threaded holes are arranged on the corrugated bottom plate 111, and the two battery cell assemblies 12 are fixed on the corrugated bottom plate 111 through bolts. Specifically, the main housing 112 is made of a high-strength and tough insulating composite material, and it is fixedly connected to the corrugated bottom plate 111 through fastening screws, so as to provide dust-proof, waterproof and impact-proof protection for the battery cell assemblies 12 arranged in the cavity formed by the two of them.

[0031] Please refer to Figures 1 - 3As shown in the figure, in this embodiment, the battery cell assembly 12 further includes two end caps 123, which are respectively arranged on the front and rear sides of a plurality of battery cells 121 arranged in sequence. A plurality of ventilation plates 13 are respectively closely attached between two adjacent battery cells 121; a steel strip 124 fastens the two end caps 123, the plurality of battery cells 121, and the plurality of ventilation plates 13 together. Specifically, the outer shell of the battery cell 121 is made of aluminum alloy, which can withstand huge extrusion forces without deformation, and the surface of the aluminum alloy is wrapped with an insulating and wear-resistant ultra-thin blue film; the aluminum busbar 122 is made of high-purity aluminum, which has a certain hardness and anti-deformation ability, and the aluminum busbar 122 electrically connects the positive and negative electrodes of two adjacent battery cells 121; preferably, the aluminum busbar 122 is melted with the positive and negative electrodes of two adjacent battery cells 121 by laser welding, so as to ensure that the weld resistance at the welding point is small; voltage acquisition probes and temperature acquisition probes are respectively arranged on the surface of the aluminum busbar 122, and all the acquired data is transmitted to the battery management system 18 for storage. Specifically, the end cap 123 is made of alloy steel material, and its surface is sprayed with a pressure-resistant insulating coating. The size of the end cap 123 is the same as the size of the contact surface with the battery cell 121, and steel strip sinking grooves are arranged on its upper and lower sides; the end cap 123 is reserved with through holes in the vertical direction, and bolts pass through the threaded holes on the corrugated bottom plate 111 and the through holes on the end cap 123 in sequence to fixedly connect the battery cell assembly 12 to the corrugated bottom plate 111; the steel strip 124 is made of a high-strength and high-toughness polymer composite material, and its surface is sprayed with a pressure-resistant insulating coating, so that the steel strip 124 has the characteristics of fire prevention and high temperature resistance; the endurance of the steel strip 124 is greater than the ultimate expansion force of the battery cell assembly 12. Specifically, a temperature sensing film is arranged on the outer surface of one side of the battery cell 121 in contact with the ventilation plate 13. The temperature sensing film is made of a high-temperature resistant material, and its temperature acquisition accuracy is high. It is electrically connected to the battery management system 18 through a communication line; the size of the temperature sensing film can be customized, and its size is 1 / 2 of the contact surface between the battery cell 121 and the ventilation plate 13, and it is fixed on the outer surface of the battery cell 121 through double-sided adhesive, so as to collect the outer surface temperature of the battery cell 121 in real time.

[0032] Please refer to Figures 1 - 3 As shown in the figure, in this embodiment, the ventilation plate 13 is made of aluminum alloy material with a high thermal conductivity coefficient and high strength, and its size is the same as the size of the contact surface with the battery cell 121; a plurality of reinforcing ribs 131 are equidistantly arranged in the ventilation holes of the ventilation plate 13, so that the ventilation plate 13 will not be squeezed and collapsed when the battery cell 121 expands during charging and discharging. The wall thickness of the ventilation hole and the thickness of the reinforcing rib 131 are selected as the thinnest size through force simulation to ensure that the cross-sectional area of the ventilation hole is the largest while leaving enough margin for strength; the ventilation plate 13 conducts the temperature generated by the battery cells 121 on both sides of it into the ventilation holes, and the cold air in the external environment brings the heat generated by the battery cells 121 into the air duct between the two battery cell assemblies 12 through the ventilation holes, and then discharges the heat in the air duct to the external environment through the intelligent control fan assembly 17.

[0033] Please refer to Figure 1 As shown, in this embodiment, the sealing plate 14 is made of L-shaped high-strength plastic material, which can withstand high temperatures and has a certain toughness, and can withstand considerable extrusion force; in order to better enhance the sealing performance of the air duct between the sealing plate 14 and the two battery cell assemblies 12, the periphery of the sealing plate 14 is wrapped with a sealing strip, so as to seal the air duct and the rear end notch of the two battery cell assemblies 12. The sealing strip has high temperature resistance, corrosion resistance and a moderate amount of deformation. It is tightly pressed against the surfaces of the two battery cell assemblies 12 respectively. The front end of the sealing strip is tightly pressed against and communicated with the intelligent control fan assembly 17 for sealing.

[0034] Please refer to Figure 2 and Figure 3 As shown, in this embodiment, the phase change heat conduction component 15 includes a fence 151 and a phase change filler 152; the fence 151 is fixedly arranged in the housing assembly 11 and wraps the two battery cell assemblies 12 therein, and there is a gap between it and the multiple aluminum rows 122; the phase change filler 152 is arranged between the multiple aluminum rows 122 and the inner wall of the fence 151, and it conducts the heat of the multiple aluminum rows 122 to the corresponding ventilation plate 13 for heat dissipation operation, and at the same time can better reduce the temperature at the top of the battery cell 121. Specifically, the phase change filler 152 is made of a solid-liquid phase change material, its phase change temperature is 60°C - 140°C, and the thermal conductivity is 3W / m·K; the phase change filler 152 has good insulation. As the temperature rises, the solid hardness of the phase change filler 152 decreases and becomes soft. The softening degree within 60°C belongs to the thixotropic type. At this time, the phase change filler 152 conducts the temperature of the multiple aluminum rows 122 to the ventilation plate 13, and at the same time reduces the temperature difference at the top of the battery cell 121 to achieve better temperature uniformity. When the temperature of the multiple aluminum rows 122 reaches 140°C, the phase change filler 152 will completely turn into a liquid state. At this time, the intelligent battery module 10 is in a thermal runaway state. The liquid-phase change filler 152 distributed between the multiple battery cells 121 can play a role in delaying thermal runaway.

[0035] Please refer to Figure 2 and Figure 3As shown, in this embodiment, the temperature-controlled air volume film 16 is made of a temperature-sensitive material, which has high temperature resistance, good flexibility, and high and low temperature expansion and contraction performance; the thickness of the temperature-controlled air volume film 16 is within 1 mm, its height dimension is the same as that of the ventilation plate 13, and the width of the temperature-controlled air volume film 16 is 4 times the width of the ventilation plate 13; the temperature-controlled air volume film 16 includes a plurality of uniformly distributed fine ventilation pores, the pore size is 60 ppi, and the pores are in a closed state and not ventilated at room temperature. Its two sides are pasted on the sides of two adjacent battery cells 121 with strong glue, and the middle part corresponds to the position of the corresponding ventilation plate 13. When the temperature of the battery cell 121 rises, since the two sides of the temperature-controlled air volume film 16 are fixed on two adjacent battery cells 121, the middle part of the temperature-controlled air volume film 16 will bend as the temperature rises. At the same time, under the negative pressure of the intelligent control fan assembly 17, it bends into the gap between two adjacent battery cells 121. The more severe the bending arc surface, the more the pores open, the greater the ventilation rate, and the maximum ventilation rate can reach 95%, and the more the incoming air flow. The specific temperature-sensitive bending degree of the temperature-controlled air volume film 16 is: when the surface temperature of the corresponding battery cell 121 reaches 30 °C, the temperature-controlled air volume film 16 bends inward to form an arc surface, and the ventilation rate of the opened pores at this time is 25%; when the surface temperature of the corresponding battery cell 121 reaches 33 °C, the temperature-controlled air volume film 16 bends inward to form an arc surface, and the ventilation rate of the opened pores at this time is 30%; when the surface temperature of the corresponding battery cell 121 reaches 35 °C, the temperature-controlled air volume film 16 bends inward to form an arc surface, and the ventilation rate of the opened pores at this time is 45%; when the surface temperature of the corresponding battery cell 121 reaches 36 °C, the temperature-controlled air volume film 16 bends inward to form an arc surface, and the ventilation rate of the opened pores at this time is 70%; when the surface temperature of the corresponding battery cell 121 reaches 37 °C, the temperature-controlled air volume film 16 bends inward to form an arc surface, and the ventilation rate of the opened pores at this time is 80%; when the surface temperature of the corresponding battery cell 121 reaches 38 °C, the temperature-controlled air volume film 16 bends inward to form an arc surface, and the ventilation rate of the opened pores at this time is 95%. At the same time, the pore ventilation rate of 95% is the maximum bending ventilation rate of the temperature-controlled air volume film; thus, the temperature-controlled air volume film 16 can adaptively adjust the incoming air volume according to the temperature range of the battery cells 121 on both sides of each ventilation plate 13, and evenly distribute the incoming air volume of each ventilation plate 13 to the greatest extent, realizing the minimum temperature difference between multiple battery cells 121.

[0036] Please refer to Figures 1 - 3As shown in the figure, in this embodiment, the intelligent control fan assembly 17 includes a wind guide cover 171 and an intelligent control fan 172; the wind guide cover 171 is communicatively disposed on one side of the air duct; the intelligent control fan 172 is fixedly disposed through the main housing 112 and connected to the wind guide cover 171, so as to discharge the hot air in the air duct to the external environment. Specifically, the wind guide cover 171 is formed by sheet metal bending, and its surface is sprayed with an insulating layer; the open end of the wind guide cover 171 is fixedly installed by screws through the through hole on the corresponding end cover 123 and is in sealed contact connection with the sealing plate 14; preferably, a thin shock pad is disposed between the wind guide cover 171 and the intelligent control fan 172 to reduce the vibration noise of the intelligent control fan 172 through the thin shock pad. Specifically, the intelligent control fan 172 is an axial flow fan with waterproof, high temperature resistant, flame retardant and low noise characteristics, and its motor is a continuous variable frequency speed regulation motor without breakpoints, and the motor is not prone to heat generation; the intelligent control fan 172 generates a certain negative pressure on the air duct, forcing the cold air in the external environment to quickly enter the air duct from the ventilation holes of the plurality of ventilation plates 13, and at the same time discharging the high temperature air inside the housing assembly 11 to the external environment, so as to realize the heat dissipation operation of the intelligent battery module 10; the intelligent control fan 172 has a flexible speed regulation function, and communicates with the battery management system 18 and the intelligent control module 19 respectively to obtain the temperature of the battery cell 121 and the temperature of the aluminum row 122 for flexible speed regulation, so as to save electric energy on the premise of ensuring effective heat dissipation; the intelligent control fan 172 does not start when the temperature of the battery cell 121 is lower than 30 °C, starts when it is higher than 30 °C, and the rotation speed of the intelligent control fan 172 increases linearly with the increase of the temperature. When the temperature of the battery cell 121 drops, the rotation speed of the intelligent control fan 172 decreases linearly with the temperature drop, and the intelligent control fan 172 stops rotating when the temperature of the battery cell 121 is lower than 30 °C.

[0037] Please refer to Figure 1 As shown in the figure, in this embodiment, the battery management system 18 adopts the prior art, so the specific control process and structure thereof will not be described in detail herein as long as it meets the requirements of this application. In this embodiment, the intelligent control module 19 is electrically connected and communicates with the battery management system 18, and shares the battery cell parameters collected by the battery management system 18. The battery cell parameters include aluminum row temperature, battery cell surface temperature, voltage, charge and discharge time, internal resistance, power, SOC, energy and capacity, etc. Among them, the aluminum row temperature, battery cell surface temperature, voltage, current, charge and discharge time are parameters that can be directly collected by actual tests, while the internal resistance, power, SOC, energy, capacity, battery cell center temperature are parameters that cannot be directly collected in actual tests. The intelligent control module 19 combines the physical relationships between the various parameters and the data-driven method to establish an AI comprehensive model, and obtains the predicted battery cell center temperature, the battery cell parameter trend curve and the battery cell parameters during the actual charge and discharge process through AI comprehensive training, so as to play a prediction role within a certain accuracy range and the function of early warning of parameter anomalies, thereby largely avoiding the safety risks of the intelligent battery module 10.

[0038] See also Figure 2 and Figure 3 As shown, in this embodiment, a thermally conductive temperature-averaging film 20 is arranged between the corrugated bottom plate 111 and the two battery cell assemblies 12. The thermally conductive temperature-averaging film 20 is made of a graphene composite material, which has surface insulation and wear-resistant, heat-resistant and pressure-resistant properties. The plane of the thermally conductive temperature-averaging film 20 has high thermal conductivity, and the thermal conductivity coefficient is 1200W / (m·K); the thermally conductive temperature-averaging film 20 is respectively bonded to the upper surface of the corrugated bottom plate 111 and the bottom of the two battery cell assemblies 12 by high-strength thermally conductive adhesive, thereby effectively connecting the bottoms of all the battery cells 121 into one piece to achieve a uniform temperature effect, and secondly, it also fills the microscopic gaps between the multiple battery cells 121 and the upper surface of the corrugated bottom plate 111, which directly plays a role in alleviating vibration.

[0039] Specifically, the AI training method of the intelligent control module 19 is as follows:

[0040] S1, establish an electrochemical simulation model of a single cell, and obtain the change curve of the theoretical parameters of the cell through transient simulation of cyclic charge and discharge;

[0041] S2, build a single cell test environment consistent with the working conditions of the electrochemical simulation model, arrange the single cell parameter collection and communication with the intelligent control module 19, conduct a large number of cycle charge and discharge tests, and derive the collectible parameter curve of the cell after the test. Compare the collectible parameter curve of the test with the parameter curve corresponding to the electrochemical simulation. If the curve overlap deviation between the electrochemical simulation and the actual test is within ±2%, it is considered that the simulation parameters are approximately consistent with the actual test parameters. In the actual test, the parameter curve that cannot be directly collected can directly refer to the corresponding electrochemical simulation parameter curve, and the non-collectible parameters can be borrowed from the electrochemical simulation parameters. The data and curves are imported into the intelligent control module 19, so that in the intelligent control module 19, the electrochemical simulation parameter theoretical data curve makes up for the vacancy of the parameter data curve that cannot be collected in the actual test; if the overlap between the electrochemical simulation and the actual test curves is greater than ±2%, then on the one hand, the overlap rate of the curves of multiple cycles of charge and discharge of the battery cell under the same working conditions is checked, and if the consistency of the multiple cycle test curves is less than ±2%, the inherent boundary conditions of the electrochemical simulation battery cell itself are directly corrected and then the simulation calculation is performed, and the same method is used for simulation iteration until the overlap deviation between the collectable data curve obtained by the electrochemical simulation and the test data curve is within ±2%;

[0042] S3. Install the intelligent control module 19 trained with the big data of monomer cell simulation and testing into the housing assembly 11 and electrically connect and communicate with the battery management system 18. During the charging and discharging process of the intelligent battery module 10, the curve offset of the cell parameters is collected in real time. When the offset of a certain parameter curve is greater than ±2%, a corresponding warning signal or a signal instruction to pause charging and discharging is sent to the battery management system 18 for execution, or a predictive failure is sent, and the time point when a failure may occur is communicated to the battery management system 18, which can effectively handle future failures in advance and keep the failure rate of the intelligent battery module 10 continuously at 0.

[0043] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0044] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. An intelligent battery module with an automatic temperature control function, characterized in that, Comprising: A housing assembly; Two battery cell assemblies, which are arranged in parallel in the housing assembly and there is an air duct between the two. Each battery cell assembly includes a plurality of battery cells arranged in a straight line in sequence, and adjacent two of the battery cells are electrically connected by an aluminum busbar; A plurality of ventilation plates, which are respectively closely attached between adjacent two of the battery cells, and ventilation holes are penetrated through the ventilation plates; A sealing plate, which is hermetically arranged on the air duct; A plurality of temperature-controlled air volume membranes, which are respectively arranged outside the corresponding ventilation plates, and the temperature-controlled air volume membranes have different degrees of pore ventilation rates according to the change of temperature; An intelligent control fan assembly, which is penetrated through the housing assembly and is connected in communication with the air duct; An intelligent control module, which is fixedly arranged in the housing assembly. The intelligent control module obtains the predicted center temperature of the battery cell, the trend curve of the battery cell parameters and the battery cell parameters during the actual charge and discharge process through AI comprehensive training; A battery management system, which is fixedly arranged in the housing assembly. The battery management system is electrically connected to the two battery cell assemblies, the intelligent control fan assembly and the intelligent control module respectively; Wherein, the temperature-controlled air volume membrane is made of a temperature-sensitive material, which includes a plurality of fine ventilation pores evenly distributed. At normal temperature, the pores are in a closed state and do not ventilate.

2. The intelligent battery module with an automatic temperature control function according to claim 1, characterized in that, It further includes a phase change heat conduction component, and the phase change heat conduction component is arranged on a plurality of the aluminum busbars, and the heat of the aluminum busbars is transferred to the corresponding ventilation plates through the phase change heat conduction component.

3. The intelligent battery module with an automatic temperature control function according to claim 2, wherein The phase change heat conduction component includes a fence, which is fixedly arranged in the housing assembly and wraps the two battery cell assemblies inside, and there is a gap between the phase change heat conduction component and the plurality of aluminum busbars; a phase change filler arranged between the plurality of aluminum busbars and the inner wall of the fence, and the phase change filler is made of a solid-liquid phase change material.

4. An intelligent battery module with an automatic temperature control function according to claim 1, characterized in that, The housing assembly includes a corrugated bottom plate and a main housing fixedly arranged on the corrugated bottom plate; the corrugated bottom plate includes three layers of stainless steel thin plates arranged in sequence, the upper and lower layers are stainless steel thin plates with high flatness respectively, and the middle layer is a corrugated stainless steel thin plate.

5. An intelligent battery module with an automatic temperature control function according to claim 4, characterized in that, A heat conduction and temperature equalizing membrane is arranged between the corrugated bottom plate and the two battery cell assemblies, and the heat conduction and temperature equalizing membrane is made of a graphene composite material.

6. The intelligent battery module with an automatic temperature control function according to claim 1, characterized in that, A plurality of reinforcing ribs are arranged at equal intervals in the ventilation holes of the ventilation plate, and the wall thickness of the ventilation holes and the thickness of the reinforcing ribs are designed through force simulation.

7. The intelligent battery module with an automatic temperature control function according to claim 1, wherein The temperature-sensitive expansion of the temperature-controlled air volume membrane is as follows: when the surface temperature of the corresponding battery cell reaches 30°C, the temperature-controlled air volume membrane expands toward the inner arc surface, and the ventilation rate of the open pores is 25% at this time; when the surface temperature of the corresponding battery cell reaches 33°C, the temperature-controlled air volume membrane expands toward the inner arc surface, and the ventilation rate of the open pores is 30% at this time; when the surface temperature of the corresponding battery cell reaches 35°C, the temperature-controlled air volume membrane expands toward the inner arc surface, and the ventilation rate of the open pores is 45% at this time; when the surface temperature of the corresponding battery cell reaches 36°C, the temperature-controlled air volume membrane expands toward the inner arc surface, and the ventilation rate of the open pores is 70% at this time; when the surface temperature of the corresponding battery cell reaches 37°C, the temperature-controlled air volume membrane expands toward the inner arc surface, and the ventilation rate of the open pores is 80% at this time; when the surface temperature of the corresponding battery cell reaches 38°C, the temperature-controlled air volume membrane expands toward the inner arc surface, and the ventilation rate of the open pores is 95% at this time.

8. The intelligent battery module with an automatic temperature control function according to claim 1, wherein, The intelligent control fan assembly includes an air guide cover, which is connected and arranged on one side of the air duct; the intelligent control fan is fixedly arranged on the shell assembly and connected to the air guide cover. The intelligent control fan adopts an axial flow fan, and its motor adopts a continuous frequency conversion speed regulation motor without breakpoints.

9. An intelligent battery module with an automatic temperature control function according to any one of claims 1-8, characterized in that, The AI training method of the intelligent control module is as follows: S1, establish an electrochemical simulation model of a single cell, and obtain the change curve of the theoretical parameters of the cell through transient simulation of cyclic charge and discharge; S2, build a single cell test environment consistent with the working conditions of the electrochemical simulation model, arrange the single cell parameter collection and communication with the intelligent control module, carry out a large number of cyclic charge and discharge tests, derive the collectible parameter curve of the cell after the test, compare the collectible parameter curve of the test with the parameter curve corresponding to the electrochemical simulation, if the curve coincidence deviation between the electrochemical simulation and the actual test is within ±2%, it is considered that the simulation parameters are approximately consistent with the actual test parameters, then the parameter curve that cannot be directly collected in the actual test can directly refer to the corresponding electrochemical simulation parameter curve, and the non-collectible parameters can be imported into the intelligent control module by borrowing electrochemical simulation parameter data and curves; if the curve coincidence between the electrochemical simulation and the actual test is greater than ±2%, first check the curve coincidence rate of multiple cycle charge and discharge of the cell under the same working conditions, if the consistency of the multiple cycle test curves is less than ±2%, directly correct the inherent boundary conditions of the electrochemical simulation cell itself and then perform simulation calculation, and iterate the simulation in the same way until the collectible data curve obtained by the electrochemical simulation coincides with the test data curve The deviation is within ±2%; S3, install the intelligent control module that has been trained by single cell simulation and test big data into the shell assembly and electrically connect and communicate with the battery management system, collect the curve offset of the cell parameters in real time during the charging and discharging process of the intelligent battery module, and when the offset of a parameter curve is greater than ±2%, issue a corresponding alarm signal or send a signal instruction to suspend charging and discharging to the battery management system to execute or predict faults.

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