CN116315270A - Cylindrical lithium battery thermal management system - Google Patents

Cylindrical lithium battery thermal management system Download PDF

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Publication number
CN116315270A
CN116315270A CN202310287346.3A CN202310287346A CN116315270A CN 116315270 A CN116315270 A CN 116315270A CN 202310287346 A CN202310287346 A CN 202310287346A CN 116315270 A CN116315270 A CN 116315270A
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China
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battery
management system
thermal management
matrix composite
ceramic matrix
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Inventor
熊永莲
张驰
葛志豪
束坤霖
颜学
贺静怡
豆直廷
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Yancheng Institute of Technology
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Yancheng Institute of Technology
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Priority to CN202310287346.3A priority Critical patent/CN116315270A/en
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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
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • 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
    • H01M10/52—Removing gases inside the secondary cell, e.g. by absorption
    • 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
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/643—Cylindrical 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
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • 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
    • 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
    • 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
    • H01M10/6561—Gases
    • H01M10/6563—Gases with forced flow, e.g. by blowers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/284—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with incorporated circuit boards, e.g. printed circuit boards [PCB]
    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • 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 discloses a cylindrical lithium battery thermal management system, which comprises a cylindrical lithium battery pack main body and a battery box main body, wherein a ceramic matrix composite material heat dissipation plate is arranged in the middle of the battery pack main body, a pcb circuit board is arranged at the top of the battery pack main body, a heat dissipation fan is arranged in the battery box main body, and an air inlet and an air outlet are arranged at two sides of the battery box main body. According to the cylindrical lithium battery thermal management system, external cold air is pumped into the box body to perform convective heat exchange with the ceramic matrix composite material radiating plate, so that the cooling operation inside the battery pack is realized.

Description

Cylindrical lithium battery thermal management system
Technical Field
The invention relates to the technical field of lithium battery thermal management, in particular to a cylindrical lithium battery thermal management system.
Background
In recent years, ternary lithium ions are widely applied to the fields of automobiles and electric vehicles by virtue of the advantages of high energy density, long cycle life, convenience in thermal management and the like. But the problem of heat dissipation due to the high heat generation rate of the battery is currently a major problem due to its continuous high load operation, or operation under extreme conditions such as high temperature environments and high current rates. The large amount of heat generated by the lithium battery seriously affects the service life of the lithium battery, so that proper thermal management operation is required to ensure the service life of the lithium battery.
Battery thermal management systems are used to regulate the maximum temperature of the battery pack during operation of an automobile to avoid thermal runaway, while reducing the temperature differential within the battery pack to reduce energy consumption. Battery thermal effects also affect the performance and cycle life of the electric vehicle. Thermal runaway of lithium batteries results in heat build-up that can potentially cause battery fires.
The main thermal management methods now include air cooling, liquid cooling, phase change cooling, etc. Most of these thermal management strategies are difficult to apply, have complex structures and are efficient in heat dissipation.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a cylindrical lithium battery thermal management system, which solves the problem that the traditional cylindrical lithium battery thermal management system is not good in effect.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a ceramic matrix composite heating panel is installed to cylindrical lithium cell thermal management system, the ceramic matrix composite heating panel is installed to the centre of battery package main part, pcb circuit board is installed at the top of battery package main part, install radiator fan in the battery box main part, battery box main part both sides set up air intake and air outlet, install waterproof dehumidification box body in the air intake outside, the battery box main part is including realizing the relevant circuit of battery system function.
Preferably, the battery pack main body is composed of 18650 electric cores, an electric core bracket, a circuit board, copper bars and insulating materials attached to the outer sides of the copper plates, wherein the insulating materials comprise formax and epoxy plates.
Preferably, the ceramic matrix composite heat dissipation plate group comprises at least one heat dissipation plate, the plurality of ceramic matrix composite heat dissipation plates are arranged in parallel, and the 18650 battery cells are nested in gaps among the ceramic matrix composite heat dissipation plates.
Preferably, the ceramic matrix composite is made of a plurality of strands of SiC fibers composited with SiC ceramic.
Preferably, a heat conducting glue layer is arranged on the wall surface of the ceramic matrix composite heat dissipation plate, which is in tangential connection with the battery unit.
Preferably, the ceramic matrix composite heat dissipation plate is connected with the electric core bracket through a fastener, and the ceramic matrix composite heat dissipation plate is vertically arranged with the heat dissipation fan.
Preferably, the cooling fans are arranged on two side walls of the battery box main body.
Preferably, air inlets and air outlets are formed in two side walls of the battery box main body, and the ceramic matrix composite heat dissipation plates are arranged between the air inlets and the air outlets in parallel.
Preferably, the waterproof dehumidifying box body is arranged at the inner side of the inlet and outlet cooling fan.
Advantageous effects
The invention provides a cylindrical lithium battery thermal management system. Compared with the prior art, the device has the following
The beneficial effects are that:
(1) The cylindrical lithium battery thermal management system can effectively solve the problems that hysteresis exists in temperature measurement, the response of an air cooling system is not timely, the heat dissipation of a complex battery structure is difficult, and the like. The system can evaluate the heat generation condition of the battery core in a future period according to the state of the current battery core, and make a corresponding control strategy for the heat generation condition.
(2) The cylindrical lithium battery thermal management system adopts the SiC/SiC ceramic matrix composite material, so that the advantages of high temperature resistance, high strength, oxidation resistance, corrosion resistance, impact resistance and strong thermal conductivity of the SiC ceramic are maintained, meanwhile, the cylindrical lithium battery thermal management system has the effects of reinforcing and toughening the SiC fiber, overcomes the congenital defects of low fracture toughness and poor external impact load resistance of the SiC ceramic, further improves the heat dissipation of the battery, effectively controls the highest temperature and the temperature difference of the battery in a reasonable range, improves the safety of the battery, further prolongs the service life of the pure electric automobile, and promotes the energy conservation and emission reduction of the automobile industry.
(3) The cylindrical lithium battery thermal management system has the advantages of simple structure and high heat dissipation efficiency, and can be widely applied to various occasions.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic view of an installation structure of a single battery pack module according to the present invention;
fig. 3 is a schematic view illustrating the internal structure of a single battery pack module according to the present invention;
FIG. 4 is a schematic diagram of the overall structure of a heat dissipating plate made of a SiC/SiC ceramic matrix composite material according to the present invention;
FIG. 5 is a schematic diagram showing a specific structure of a heat dissipating plate made of a SiC/SiC ceramic matrix composite material according to the present invention;
FIG. 6 is a schematic diagram of the distribution of other components of the present invention;
FIG. 7 is a schematic diagram of a fan according to the present invention;
FIG. 8 is a schematic view of the internal area of the battery case of the present invention;
FIG. 9 is a graph showing the temperature versus time under 0.5C discharge conditions for a battery according to the present invention;
FIG. 10 is a graph showing the relationship between temperature and time under the discharging condition of the battery 1C according to the present invention;
FIG. 11 is a graph showing the relationship between temperature and time under the discharging condition of the battery 2C according to the present invention;
FIG. 12 is a schematic diagram of a temperature prediction method according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-11, the present invention provides a technical solution: the high latent heat and high heat capacity characteristics of the SiC/SiC ceramic matrix composite material enable the SiC/SiC ceramic matrix composite material to absorb or release a large amount of heat energy in the phase change process, so that the adjacent temperature can be stably maintained at a comparable level. The optimal working temperature of the battery is about 40 ℃, and the SiC/SiC ceramic matrix composite material is stable and reliable, is suitable for a corresponding temperature range and can be used as a ceramic matrix composite material for project cooperation. According to the invention, 3D printing ABS plastic is used as a support material, and the joint of the SiC/SiC ceramic matrix composite heat dissipation plate and the battery monomer is coated with heat conduction silicone grease as shown in a structure 4 in FIG 5, so that the heat of the battery can be conveniently diffused.
As shown in FIG. 2, the lithium battery thermal management system based on a SiC/SiC ceramic matrix composite heat dissipation structure is shown as one module, and is used for adjusting the battery temperature, and the device comprises a battery monomer 2 shown in FIG. two, a SiC/SiC ceramic matrix composite heat dissipation plate 1 shown in FIG. one, bracket materials 3 and 4 shown in FIG. one, copper bars 2 shown in FIG. one and heat conduction silicone grease shown in FIG. three. The battery cells are wrapped by the brackets 2 and 3 as shown in the figure I, a plurality of heat dissipation plates with structures shown as 4 and 5 are arranged in the middle of the brackets, and the heat dissipation plates are nested at the periphery of each battery cell.
As a preferred embodiment, battery 1 may be a ternary 18650 cylindrical lithium ion battery cell.
Preferably, the shell is made of 45 steel or aluminum alloy.
The battery thermal management system is characterized in that the joint of the heat dissipation plate and the battery monomer is smeared with silicone grease to increase the temperature range tolerance and the heat conductivity of the thermal management system,
the SiC/SiC ceramic matrix composite material is applied to an automobile battery thermal management system, so that the integration of the SiC/SiC ceramic matrix composite material and the system can be realized, the heat dissipation performance inside the battery is effectively improved, and the heat transfer efficiency of the battery pack is comprehensively optimized. The high thermal conductivity of the SiC/SiC ceramic matrix composite material can be used for better storing redundant heat generated by the battery operation, so that the normal operation temperature is ensured, and thermal runaway is avoided.
As shown in fig. 5, structures 1, 2 and 3 are SiC/SiC ceramic matrix composite heat dissipation single plates, which are nested with structure 4, and a battery cell is placed in structure 4.
As shown in fig. 6, the structure 1 is a signal connector for inputting an external vehicle signal into a battery box to activate Battery Management Systems (BMS) 7, 8, 11 and detect an activated state of the vehicle. The structure 2 is a high-voltage connector and is used for connecting the input and output of a battery with a structure 3 pre-charge relay, a structure 4 shunt, a structure 6 fuse, a structure 9 gold resistor, a structure 10 main positive main negative relay and a structure 12 charge-discharge socket. The structure 5 is an insulation detection device for performing insulation detection and control in cooperation with a Battery Management System (BMS). The Battery Management System (BMS) is also a thermal management system.
As shown in fig. 7, the heat dissipation area is composed of a partition, a fan bracket and a fan.
Fig. 8 is a layout of a battery box, the component distribution diagram shown in fig. 6 is located in the component area in fig. 7, the battery management systems 7 and 8 are located in the slave control area, 11 is located in the master control area, the heat dissipation area is located in the No. 1 area, and the battery modules 2, 3, 4 and 5 are battery modules. The module and the heat dissipation area partition board are hollow partition boards, and the openings of the SiC ceramic matrix composite heat dissipation fins face the heat dissipation area, so that the heat dissipation effect of the battery cell is effectively enhanced.
The inner part of the battery box body is clear in area, and the assembly is finished in order and is convenient to detach and assemble. The components in the box body are compact and orderly, and the space is efficiently utilized.
The method for battery thermal management comprises 1. Calculating and predicting battery heat generation through a Bernardi model, but because the model needs open-circuit voltage, the model is not applicable to practical working conditions, the battery heat generation can be predicted through tests on temperature rise characteristics under different discharge multiplying powers and linear fitting, and then the Bernardi model is used for predicting battery heat generation. 2. The control strategy of the thermal management system is formulated by combining important parameters such as battery voltage, current, battery heat generation and the like for representing the state of the battery core, so that the battery is ensured to be in a safe and reliable state.
The calculation and prediction of battery heat generation are the core of a lithium ion battery heat management system. The principle is shown in fig. 12, the open circuit voltage is input to an open circuit voltage model to estimate the SOC, the values of the R1 polarization internal resistance and the ohmic internal resistance R0 can be calculated and obtained by the current SOC, the values of R0 and R1 and the input current and temperature are substituted to a Bernardi heat generation rate model, and the predicted temperature is obtained by an equivalent specific heat capacity method.
In order to obtain the temperature rise conditions of the battery under different discharge rates, the discharge rates of 0.5C, 1C and 2C are selected for experiments on the battery:
after the battery is fully kept stand, the constant current 1C is 3200mA and is charged to 4.2V, then the constant voltage is used for charging to the current which is smaller than 0.02C and is 64mA, the constant current is used for discharging the battery by the current of 0.5C and recording data, after the battery is fully kept stand, the constant current 1C is charged to 4.2V, then the constant voltage is used for charging to the current which is smaller than 0.02C, the constant current 1C is used for discharging the battery by the current of 1C and recording data, after the battery is fully kept stand, the constant current 1C is charged to 4.2V, and then the constant voltage is used for charging to the current which is smaller than 0.02C, and the constant current is used for discharging the battery by the current of 2C and recording data.
And (3) performing linear fitting on the recorded data under the condition of 0.5C discharge by using a cftool in Matlab, comprehensively considering the problems of fitting formation and complexity, and for the corresponding relation between the temperature rise and time under different discharge multiplying factors, wherein the fitting effect of a three-order Gaussian mixture model is best, R-square and Adjusted R-square reach 0.9988 and 0.9987 respectively, and the image is shown in figure 9. The empirical formula was obtained as follows:
General model Gauss3:
f(x)＝
a1*exp(-((x-b1)/c1)^2)+a2*exp(-((x-b2)/c2)^2)+
a3*exp(-((x-b3)/c3)^2)
Coefficients(with 95％confidence bounds):
a1＝8.253e+12(-3.106e+16,3.107e+16)
b1＝1858(-2.452e+05,2.489e+05)
c1＝333(-2.403e+04,2.469e+04)
a2＝20.8(-24.56,66.16)
b2＝71.41(-0.8897,143.7)
c2＝90.83(-147.4,329)
a3＝9.978(-36.65,56.61)
b3＝-1.379(-20.62,17.86)
c3＝49.1(1.356,96.84)
f (x) is a temperature value, and x is a time value.
For the linear fitting of the temperature curve under the 1C discharge condition, the problems of fitting degree and complexity are comprehensively considered, for the corresponding relation between the temperature rise temperature and time under different discharge multiplying factors, the fitting effect of the third-order Gaussian mixture model is best, the R-square and the Adjusted R-square reach 0.9999 and 0.9999 respectively, and an image is shown in FIG. 10. The empirical formula was obtained as follows:
General model Gauss3:
f(x)＝
a1*exp(-((x-b1)/c1)^2)+a2*exp(-((x-b2)/c2)^2)+
a3*exp(-((x-b3)/c3)^2)
Coefficients(with 95％confidence bounds):
a1＝352.1(-1391,2095)
b1＝371.7(-267.6,1011)
c1＝205.9(6.12,405.7)
a2＝8.706(6.473,10.94)
b2＝23.71(19.75,27.68)
c2＝24.08(18.67,29.49)
a3＝5.246(1.678,8.814)
b3＝5.639(4.608,6.671)
c3＝14.34(11.7,16.99)
f (x) is a temperature value, and x is a time value.
For the linear fitting of the temperature curve under the 1C discharge condition, the problems of fitting degree and complexity are comprehensively considered, for the corresponding relation between the temperature rise temperature and time under different discharge multiplying factors, the fitting effect of the third-order Gaussian mixture model is best, the R-square and the Adjusted R-square reach 0.9998 and 0.9998 respectively, and an image is shown in FIG. 11. The empirical formula was obtained as follows:
General model Gauss3:
f(x)＝
a1*exp(-((x-b1)/c1)^2)+a2*exp(-((x-b2)/c2)^2)+
a3*exp(-((x-b3)/c3)^2)
Coefficients(with 95％confidence bounds):
a1＝62.43(41.2,83.66)
b1＝41.78(14.82,68.74)
c1＝30.57(4.119,57.02)
a2＝12.97(-3.656,29.59)
b2＝15.54(4.768,26.31)
c2＝10.77(-1.23,22.78)
a3＝13.4(-21.86,48.66)
b3＝4.751(0.3948,9.107)
c3＝8.648(3.073,14.22)
f (x) is a temperature value, and x is a time value.
The thermal management system control strategy is as follows:
the thermal management system will be in operation when external power (DCDC) is accessed.
The cell temperature sensors are measured at the cathodes of each cell and the sensors are directly connected to the cathodes or in direct contact with the respective cell bus bars along the large current path within 10 mm. A temperature sensor is in direct contact with the plurality of cells and the sensor can be used to detect the plurality of cells.
The temperature sensor monitors at least 30% of the cell temperature, and the detected cells are uniformly distributed in the cell box.
When the thermal management system detects that the internal temperature of the system exceeds the optimal temperature of the battery, the system sends a starting signal to a servo motor in the fan, the random servo motor rotates forward, accumulated hot air in the battery pack can be blown and extruded at the moment, heat transfer is achieved, the temperature of a battery pack area in the battery system is further reduced, when the temperature falls into an optimal working temperature interval, a closing signal is sent to the servo motor, and the heat dissipation system is closed, so that stable operation of the system is achieved.
And the thermal management system predicts that the temperature rise rate is too high in a certain time, then forcible heat dissipation is started, and the thermal management system is communicated with the motor controller through the CAN to limit the output power of the battery system, so that the heat generation of the battery core is reduced.
The thermal management system will be considered a dangerous state when several conditions occur:
when abnormality of the battery SOC change rate is detected and the duration exceeds 1s
When the temperature difference of each cell exceeds 3 ℃ and above and the duration exceeds 1s
When it is detected that the battery temperature is higher than the smaller one of the temperature range and 60 c specified in the battery parameter table, the duration exceeds 1s.
When the output voltage value is detected to exceed 500ms.
When the cell polarization internal resistance is detected to be far greater than the calibration internal resistance.
When the detection line stubs exceed 500ms.
When accuracy and sensor noise are to be considered in the threshold setting
When the dangerous state occurs, the thermal management system outputs a switch signal to the main positive relay and the main negative relay, the working state of the battery is stopped, an alarm signal is output to the outside, and meanwhile, the heat dissipation system is started to conduct forced heat dissipation.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The utility model provides a cylindrical lithium cell thermal management system, includes battery package main part and battery box main part, its characterized in that: the battery pack comprises a battery pack body, wherein a ceramic matrix composite heat dissipation plate is arranged in the middle of the battery pack body, a pcb circuit board is arranged at the top of the battery pack body, a heat dissipation fan is arranged in the battery box body, an air inlet and an air outlet are formed in two sides of the battery box body, a waterproof dehumidifying box body is arranged outside the air inlet and the air outlet, and the battery box body comprises a related circuit for realizing functions of a battery system.
2. The cylindrical lithium battery thermal management system of claim 1, wherein: the battery pack main body is composed of 18650 battery cells, a battery cell support, a circuit board, copper bars and insulating materials attached to the outer sides of the copper plates, wherein the insulating materials comprise formax and epoxy plates.
3. The cylindrical lithium battery thermal management system of claim 1, wherein: the ceramic matrix composite cooling plate group comprises at least one cooling plate, the ceramic matrix composite cooling plates are arranged in parallel, and the 18650 battery cells are nested in gaps between the ceramic matrix composite cooling plates.
4. The cylindrical lithium battery thermal management system of claim 1, wherein: the ceramic matrix composite is prepared by compounding a plurality of strands of SiC fibers and SiC ceramics.
5. The cylindrical lithium battery thermal management system of claim 1, wherein: and a heat conducting adhesive layer is arranged on the wall surface of the ceramic matrix composite heat dissipation plate, which is tangential to the battery unit.
6. The cylindrical lithium battery thermal management system of claim 1, wherein: the ceramic matrix composite cooling plate is connected with the battery core support through a fastener, and the ceramic matrix composite cooling plate is vertically arranged with the cooling fan.
7. The cylindrical lithium battery thermal management system of claim 1, wherein: the cooling fans are arranged on two side walls of the battery box main body.
8. The cylindrical lithium battery thermal management system of claim 1, wherein: the battery box is characterized in that air inlets and air outlets are formed in two side walls of the battery box main body, and the ceramic matrix composite heat dissipation plates are arranged between the air inlets and the air outlets in parallel.
9. The cylindrical lithium battery thermal management system of claim 1, wherein: the waterproof dehumidifying box body is arranged at the inner side of the inlet and outlet cooling fan.
CN202310287346.3A 2023-03-23 2023-03-23 Cylindrical lithium battery thermal management system Pending CN116315270A (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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CN116315270A true CN116315270A (en) 2023-06-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117353430A (en) * 2023-12-04 2024-01-05 南京中电科能技术有限公司 Energy storage operation control method based on energy storage temperature rise characteristic constraint

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117353430A (en) * 2023-12-04 2024-01-05 南京中电科能技术有限公司 Energy storage operation control method based on energy storage temperature rise characteristic constraint
CN117353430B (en) * 2023-12-04 2024-02-23 南京中电科能技术有限公司 Energy storage operation control method based on energy storage temperature rise characteristic constraint

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