KR20170031904A - Battery Pack System Comprising Boost Pack and Capacitor Pack - Google Patents

Abstract

As a battery pack system for driving an engine, the present invention provides the battery pack system which includes: a boost pack and a capacitor pack to which a plurality of battery cells are connected in series and parallel, respectively; a first circuit breaker and a second circuit breaker which control the electrical connection of the boost pack and the capacitor pack for the engine, respectively; and a micro control unit (MCU) which controls the operations of the first circuit breaker and the second circuit breaker. The electrical connection between the engine and the boost and capacitor packs can be controlled according to the driving point of the engine. Accordingly, the present invention can prevent a battery pack from being discharged and effectively output a voltage and a current consumed for driving.

Description

A battery pack system including a boost pack and a capacitor pack (Battery Pack System Comprising Boost Pack and Capacitor Pack)

The present invention relates to a battery pack system including a boost pack and a capacitor pack.

In recent years, the demand for environmentally friendly alternative energy sources has become an indispensable factor for the future, as the increase in the price of energy sources due to depletion of fossil fuels and the interest in environmental pollution are amplified. Various researches on power generation technologies such as nuclear power, solar power, wind power, and tidal power have been continuing, and electric power storage devices for more efficient use of such generated energy have also been attracting much attention.

Particularly, it can be applied to electric vehicles (EVs), hybrid electric vehicles (HEV), plug-in hybrids, and the like, which are proposed as solutions for air pollution of existing gasoline vehicles and diesel vehicles using fossil fuels, BACKGROUND ART As technology development and demand for an electric vehicle (Plug-In HEV) and the like increase, demand for a battery as an energy source is rapidly increasing.

Such a battery is roughly classified into a primary battery represented by manganese, mercury, and alkali, and a rechargeable secondary battery represented by nickel-cadmium, lithium ion, nickel-hydrogen, and the like.

Of these secondary batteries, lead acid batteries have been widely used for automobiles, boats, airplanes, and continuous power devices as the earliest invented secondary batteries, and have been developed repeatedly with the popularization and popularization of vehicles.

FIG. 1 is a schematic diagram schematically showing a structure of a conventional battery system for driving an engine.

Referring to FIG. 1, the battery system 100 includes a lead-acid battery 110 as a power source.

The lead acid battery 110 is electrically connected to the engine 120 and includes a circuit breaker 130 for controlling the electrical connection with the engine 120 and a micro control unit 140 for controlling the operation of the circuit breaker 130 .

The lead acid battery 110 drives the engine 120 by outputting a value equal to or greater than the minimum voltage and current required for starting the engine 120 at the start of driving the engine 120. [

In the course of driving the engine 120, the lead-acid battery 110 is charged with a voltage exceeding the minimum voltage and current required at the start of the subsequent drive due to the current generated by the drive of the engine 120.

However, unlike general purpose powering devices such as passenger cars, which are frequently driven at regular intervals, industrial or agricultural powering devices such as snowmobile or tractors with seasonality are used for about 2 hours per week from spring to autumn throughout the year , The use period is longer than that of the general purpose power unit.

Accordingly, the lead acid battery used for driving the industrial or agricultural power unit is required to be capable of being operated at a high speed during a starting period of an industrial or agricultural power apparatus using the lead acid battery, There is a problem that a capacity shortage phenomenon frequently occurs. To cope with this problem, it is troublesome to always provide an emergency starter, etc. separately.

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

The inventors of the present application have conducted intensive research and various experiments. As described later, the battery pack is divided into a boost pack and a capacitor pack, and according to the driving timing of the engine to which the battery pack system is applied, By controlling the electrical connection with the engine, it is possible to prevent the battery pack from discharging in spite of the long driving period, and to effectively output the voltage and current required for the driving when the engine is driven, There is no need to provide a separate emergency starter so that it is possible to eliminate the inconvenience and to effectively replace the conventional battery pack system using the lead acid battery without a separate design change for the electrical connection to the engine And have completed the present invention.

According to an aspect of the present invention, there is provided a battery pack system comprising:

An engine-driven battery pack system,

A boost pack and a capacitor pack in which a plurality of battery cells are connected in series and in parallel, respectively;

A first circuit breaker and a second circuit breaker respectively regulating electrical connection of the boost pack and the capacitor pack to the engine; And

A micro control unit (MCU) for controlling the operation of the first circuit breaker and the second circuit breaker,

Lt; / RTI >

The boost pack and the capacitor pack may have a structure in which the electrical connection with the engine is controlled according to the driving timing of the engine.

Therefore, the separated boost pack and the capacitor pack are controlled in electrical connection with the engine according to the driving timing of the engine to which the battery pack system is applied, thereby preventing the battery pack from being discharged despite the long driving period At the same time, when the engine is driven, the voltage and the current required for the driving can be effectively outputted. Therefore, it is not necessary to provide a separate emergency starter, thereby eliminating the troubles caused by the emergency starter, It is possible to effectively replace a conventional battery pack system using a lead-acid battery without any special design change for the battery pack.

In one specific example, the boost pack and the capacitor pack may be electrically connected to the engine at the start of driving the engine.

As an example of a general agricultural power vehicle, in the case of a tractor, at least 15 V (volt) and 400 A (ampere) voltage and current are required to start driving the engine of the tractor.

In this case, the boost pack and the capacitor pack are connected in series and in parallel with each other to output voltage and current of about 3.6V to 4.2V, 100A to 120A, and more specifically, the boost pack and the capacitor pack Four unit cells of a 4S2P structure in which a total of eight battery cells are connected in series and in parallel are connected in series to each other to form a boost pack and a capacitor Respectively. Here, the terms S and P denote series and parallel connection structures, respectively.

In addition, the boost pack and the capacitor pack of the 4S2P structure may be connected in parallel to each other to have a structure of 4S4P. Accordingly, the boost pack and the capacitor pack output voltages and currents of 15V, Drive can be started.

Here, the boost pack and the capacitor pack of the 4S2P structure are charged and maintained at different voltages from each other in the driving process before the start of driving. More specifically, the capacitor pack is a relatively low voltage as compared with the boost pack, Lt; RTI ID = 0.0 > 15V < / RTI >

Accordingly, the boost pack and the capacitor pack are connected in parallel to each other between a drive start point of the engine or a previous drive end point of the engine and the drive start point, and thereby the value of the minimum voltage and current , The voltage and current balance can be formed. As a result, the boost pack and the capacitor pack can generate the same voltage and current at the start of the engine operation, And a current can be output.

In such a case, the boost pack and the capacitor pack may be configured to output a voltage of 100% to 110% with respect to a minimum required voltage for starting driving of the engine at the start of driving the engine.

If the boost pack and the capacitor pack output voltages and currents of less than 100% with respect to the minimum required voltage for starting the engine at the starting point of driving the engine, the engine can not be driven and the 110% , There is a problem in that the elements may be damaged by exceeding the maximum allowable voltage which does not cause abnormality with respect to the performance of other elements constituting the device to which the engine is applied.

Hereinafter, the reason why the boost pack and the capacitor pack are charged and maintained at different voltages in the driving process before the start of the driving operation will be described in more detail.

Meanwhile, the boost pack may be structured such that the electrical connection to the engine is interrupted between the driving of the engine.

As described above, the capacitor pack can be charged and maintained at a level lower than the minimum voltage and current required for starting the engine in the driving process before the start of driving, and at the start of driving of the engine, Voltage and current and is connected in parallel with the boost pack which is charged and maintained by the voltage and current so as to balance the voltage and the current so as to output a value equal to or higher than a minimum voltage and current required for starting the engine.

In other words, the boost pack is required only for outputting a value equal to or greater than a minimum voltage and a current required for starting the engine at the starting point of driving the engine. Lt; / RTI >

Also, between the driving of the engine, the voltage and current of the capacitor pack may be structured such that they are charged and maintained within a predetermined error range having a constant pulse.

In this case, the voltage and current of the capacitor pack may be a structure that is charged and maintained by driving of the engine.

More specifically, unlike the boost pack, the capacitor pack maintains electrical connection with the engine, and due to the pulse current generated by driving the engine, the voltage and current of the capacitor pack are constant And may be a structure that is charged and held within a predetermined error range with a pulse.

In this regard, in the case of a tractor driven using a conventional lead acid battery, the power generation system is designed on the assumption that the lead acid battery is a capacitor, so that the lead acid battery is always connected to the output portion of the engine, .

On the other hand, in the battery pack system according to the present invention, since the capacitor pack is maintained in an electrically connected state with the engine, the operation of the engine can be normally operated even in place of the conventional lead acid battery.

The error range of the voltage and current of the capacitor pack between the driving of the engine may be ± 1% to ± 10% of the average voltage and current of the capacitor pack.

As described above, since the voltage and current of the capacitor pack are charged and maintained within a predetermined error range having a constant pulse due to the pulse current generated by the drive of the engine, the error range may be at least ± 1% have.

However, when the error range exceeds 10%, the maximum voltage of the capacitor pack becomes excessively large and the engine can exceed the maximum allowable voltage of the elements constituting the applied device, May be damaged.

More specifically, between the driving of the engine, the maximum voltage of the capacitor pack may be 85% to 95% of the maximum allowable voltage of the elements constituting the device to which the engine is applied.

If the maximum voltage of the capacitor pack is less than 85% of the maximum allowable voltage of the elements constituting the device to which the engine is applied, the voltage at which the capacitor pack is charged and maintained between the driving of the engine becomes excessively low, The voltage and current of the boost pack may be balanced with the minimum voltage and current required to start the engine.

On the other hand, when the maximum voltage of the capacitor pack exceeds 95% of the maximum allowable voltage of the elements constituting the device to which the engine is applied, the voltage at which the capacitor pack is charged and maintained, The voltage that is in equilibrium with the boost pack may become excessively high relative to the maximum allowable voltage of other elements constituting the device at the starting point of the operation of the engine, There is a problem that other elements constituting the device may be damaged.

Meanwhile, between the drive of the engine, the boost pack may be configured to be charged with a voltage higher than an average voltage of the capacitor pack.

As described above, the boost pack may be structured such that the electrical connection to the engine is interrupted between the driving of the engine.

Therefore, the boost pack may not cause damage to the elements even if the boost pack is charged to a value exceeding the maximum allowable voltage of other elements constituting the device between the driving of the engine.

Also, since the boost pack is charged with a higher voltage than the average voltage of the capacitor pack between the driving of the engine, the boost pack is charged and maintained at a lower value than the minimum voltage and current required for driving the engine By balancing the voltage and current of the capacitor pack, the engine can be effectively driven.

At this time, between the driving of the engine, the boost pack may be charged with a voltage of 110% to 120% with respect to the average voltage of the capacitor pack.

If the boost pack is charged at a voltage of 110% with respect to the average voltage of the capacitor pack between the driving of the engine and the voltage of the capacitor pack and the current May be lower than the minimum voltage required for driving the engine, and the engine may not be driven.

On the other hand, when the boost pack is charged with a voltage exceeding 120% with respect to the average voltage of the capacitor pack between the driving of the engine and the voltage of the capacitor pack, May be higher than the maximum allowable voltage of other elements constituting the device, and other factors may be damaged by the voltage output in the process of starting the engine.

In one specific example, the boost pack and the capacitor pack may each be structured to include the same number of battery cells.

More specifically, the boost pack and the capacitor pack have a minute voltage difference at each time point when the engine is driven, and when the number of battery cells constituting the boost pack and the capacitor pack are different, The voltage difference between the capacitor pack and the capacitor pack becomes excessively large, and the above-described problems may arise.

The number of the battery cells constituting the boost pack and the capacitor pack may be controlled according to the voltage of the battery cells, the minimum voltage required for driving the engine, the type of the device to which the engine is applied, and the application.

Therefore, the battery pack system according to the present invention can be more easily applied to various devices than a conventional lead acid battery.

In one specific example, the type of the battery cell is not particularly limited, but specific examples thereof include a lithium ion battery having advantages such as a high energy density, a discharge voltage, and an output stability, a lithium secondary battery such as a lithium ion polymer battery, Battery.

Generally, a lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte containing a lithium salt.

The positive electrode is prepared, for example, by coating a mixture of a positive electrode active material, a conductive material and a binder on a positive electrode current collector, and then drying the mixture. Optionally, a filler may be further added to the mixture.

The cathode active material may be a layered compound such as lithium cobalt oxide (LiCoO ₂ ), lithium nickel oxide (LiNiO ₂ ), or a compound substituted with one or more transition metals; Lithium manganese oxides such as Li _{1 + x} Mn _{2 -x} O ₄ (where x is 0 to 0.33), LiMnO ₃ , LiMn ₂ O ₃ , LiMnO ₂ and the like; Lithium copper oxide (Li ₂ CuO ₂ ); Vanadium oxides such as LiV ₃ O ₈ , LiFe ₃ O ₄ , V ₂ O ₅ and Cu ₂ V ₂ O ₇ ; A Ni-site type lithium nickel oxide expressed by the formula LiNi _1-x M _x O ₂ (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga and x = 0.01 to 0.3); Formula _{LiMn 2-x M x O 2} ( where, M = Co, Ni, Fe , Cr, and Zn, or Ta, x = 0.01 ~ 0.1 Im) or Li ₂ Mn ₃ MO ₈ (where, M = Fe, Co, Ni, Cu, or Zn); LiMn ₂ O _{4 in} which a part of Li in the formula is substituted with an alkaline earth metal ion; Disulfide compounds; Fe ₂ (MoO ₄ ) ₃ , and the like. However, the present invention is not limited to these.

The conductive material is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture including the cathode active material. Such a conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, for example, graphite such as natural graphite or artificial graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskey such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.

The binder is a component which assists in bonding of the active material and the conductive material and bonding to the current collector, and is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture containing the cathode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.

The filler is optionally used as a component for suppressing the expansion of the anode, and is not particularly limited as long as it is a fibrous material without causing a chemical change in the battery. Examples of the filler include olefin polymers such as polyethylene and polypropylene; Fibrous materials such as glass fibers and carbon fibers are used.

The negative electrode is manufactured by applying and drying a negative electrode active material on a negative electrode collector, and if necessary, the above-described components may be selectively included.

Examples of the negative electrode active material include carbon such as non-graphitized carbon and graphite carbon; _{Li x Fe 2 O 3 (0≤x≤1} ), Li x WO 2 (0≤x≤1), Sn x Me 1-x Me 'y O z (Me: Mn, Fe, Pb, Ge; Me' : Metal complex oxides such as Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, Halogen, 0 < x &lt; Lithium metal; Lithium alloy; Silicon-based alloys; Tin alloy; _{SnO, SnO 2, PbO, PbO} 2, Pb 2 O 3, Pb 3 O 4, Sb 2 O 3, Sb 2 O 4, Sb 2 O 5, GeO, GeO 2, Bi 2 O 3, Bi 2 O 4, and Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like can be used.

The separation membrane and the separation film are interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the separator is generally 0.01 to 10 mu m, and the thickness is generally 5 to 130 mu m. Such separation membranes include, for example, olefinic polymers such as polypropylene, which are chemically resistant and hydrophobic; A sheet or nonwoven fabric made of glass fiber, polyethylene or the like is used. When a solid electrolyte such as a polymer is used as an electrolyte, the solid electrolyte may also serve as a separation membrane.

Further, in one specific example, in order to improve the safety of the battery, the separation membrane and / or the separation film may be an organic / inorganic composite porous SRS (Safety-Reinforcing Separators) separation membrane.

The SRS separator is manufactured by using inorganic particles and a binder polymer on the polyolefin-based separator substrate as an active layer component. In addition to the pore structure contained in the separator substrate itself, the SRS separator is formed by interstitial volume between inorganic particles And has a uniform pore structure.

The use of such an organic / inorganic composite porous separator has the advantage of suppressing an increase in thickness of the cell due to swelling at the time of chemical conversion compared with the case of using a conventional separator, When a gelable polymer is used when liquid electrolyte is impregnated, it can also be used as an electrolyte.

In addition, the organic / inorganic composite porous separator can exhibit excellent adhesion characteristics by controlling the contents of the inorganic particles and the binder polymer in the separator, so that the cell assembly process can be easily performed.

The inorganic particles are not particularly limited as long as they are electrochemically stable. That is, the inorganic particles usable in the present invention are not particularly limited as long as the oxidation and / or reduction reaction does not occur in the operating voltage range of the applied battery (for example, 0 to 5 V based on Li / Li +). Particularly, when inorganic particles having an ion-transporting ability are used, the ion conductivity in the electrochemical device can be increased and the performance can be improved. Therefore, it is preferable that the ionic conductivity is as high as possible. In addition, when the inorganic particles have a high density, it is difficult to disperse the particles at the time of coating, and there is a problem of an increase in weight during the production of the battery. In the case of an inorganic substance having a high dielectric constant, dissociation of an electrolyte salt, for example, a lithium salt, in the liquid electrolyte also contributes to increase ionic conductivity of the electrolyte.

The nonaqueous electrolyte solution containing a lithium salt is composed of a polar organic electrolyte and a lithium salt. As the electrolytic solution, a non-aqueous liquid electrolytic solution, an organic solid electrolyte, an inorganic solid electrolyte and the like are used.

Examples of the nonaqueous liquid electrolytic solution include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma -Butyrolactone, 1,2-dimethoxyethane, tetrahydroxyfuran, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane , Acetonitrile, nitromethane, methyl formate, methyl acetate, triester phosphate, trimethoxymethane, dioxolane derivatives, sulfolane, methylsulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate Nonionic organic solvents such as tetrahydrofuran derivatives, ethers, methyl pyrophosphate, ethyl propionate and the like can be used.

Examples of the organic solid electrolyte include a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, Polymers containing ionic dissociation groups, and the like can be used.

Examples of the inorganic solid electrolyte include Li ₃ N, LiI, Li ₅ NI ₂ , Li ₃ N-LiI-LiOH, LiSiO ₄ , LiSiO ₄ -LiI-LiOH, Li ₂ SiS ₃ , Li ₄ SiO ₄ , Nitrides, halides and sulfates of Li such as Li ₄ SiO ₄ -LiI-LiOH and Li ₃ PO ₄ -Li ₂ S-SiS ₂ can be used.

The lithium salt is a material that is readily soluble in the non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO 4, LiBF 4, LiB 10 Cl 10, LiPF 6, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF _{6, LiSbF 6, LiAlCl 4,} CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide have.

For the purpose of improving the charge-discharge characteristics and the flame retardancy, the non-aqueous liquid electrolyte may contain, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, glyme, N, N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2-methoxyethanol, aluminum trichloride and the like are added It is possible. In some cases, a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further added to impart nonflammability, or a carbon dioxide gas may be further added to improve high-temperature storage characteristics.

The present invention also provides a method of driving an engine using the battery pack system,

a) a step of outputting and applying the same voltage while both the boost pack and the capacitor pack are electrically connected to the engine;

b) starting driving of the engine by using the currents applied from the boost pack and the capacitor pack;

c) after the start of driving of the engine, the connection of the boost pack to the engine is cut off;

d) maintaining the driving of the engine in a state where the capacitor pack is electrically connected to the engine;

e) terminating the driving of the engine;

. &Lt; / RTI &gt;

In this case, in the step d), the capacitor pack may be structured such that the voltage is maintained within a predetermined error range having a predetermined pulse. More specifically, the voltage of the capacitor pack is charged and discharged by driving the engine. It may be a structure that is maintained.

The tolerance range of the voltage of the capacitor pack may be set such that the maximum allowable voltage of the elements constituting the device to which the engine is applied is exceeded, Can be +/- 1% to +/- 10% of the size of the voltage.

Meanwhile, in the step d), the boost pack is balanced with the voltage and current of the capacitor pack at the start of the subsequent engine operation, so as to output the minimum voltage required for driving the engine, and the average voltage of the capacitor pack May be charged at a voltage of 110% to 120%.

The present invention also provides a device comprising the battery pack system, wherein the device may be a powered vehicle having a long service life, and in particular, an industrial power unit or an agricultural power unit having seasonal specificity for use And more specifically, a snow removal vehicle, a rice miller, a tractor, or a cereal harvesting vehicle.

As described above, in the battery pack system according to the present invention, the battery pack is divided into the boost pack and the capacitor pack, and the electrical connection with the engine is controlled according to the driving timing of the engine to which the battery pack system is applied , It is possible to prevent the battery pack from being discharged despite the long driving period and to effectively output the voltage and current required for the driving when the engine is driven and accordingly it is necessary to provide a separate emergency starter There is an effect that the conventional battery pack system using the lead acid battery can be effectively replaced without any additional design change for the electrical connection to the engine.

1 is a schematic view schematically showing a structure of a conventional battery system for driving an engine;
2 is a schematic view schematically showing the structure of a battery pack system according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings according to the embodiments of the present invention, but the scope of the present invention is not limited thereto.

FIG. 2 is a schematic view schematically showing the structure of a battery pack system according to an embodiment of the present invention.

2, the battery pack system 200 includes a boost pack 210 and a capacitor pack 220 as a power source. The boost pack 210 and the capacitor pack 220 are electrically connected to the engine 230 Respectively.

The electrical connection between the boost pack 210 and the capacitor pack 220 to the engine 230 is regulated by the first breaker 231 and the second breaker 232 respectively and the first breaker 231 and the second breaker 232, (232) is controlled by the micro control unit (240).

The battery pack system 200 includes a protection circuit 250 for protecting the battery pack system 200 from an anomaly caused by an external stimulus or an anomaly caused by an internal problem.

Between the boost pack 210 and the first circuit breaker 231, a boost circuit 260 for changing the voltage from the boost pack 210 is disposed.

The battery pack system 200 is configured such that the boost pack 210 and the capacitor pack 220 are electrically connected to the engine 230 at the start of driving of the engine 230 to output a balanced voltage and current Thereby driving the engine 230.

The connection of the boost pack 210 to the engine 230 is cut off and the capacitor pack 220 is charged by the voltage 230 due to the pulse current generated as the engine 230 is driven, Is charged and held within a predetermined error range having a constant pulse.

At this time, the boost pack 210 is charged with a voltage relatively higher than the average voltage of the capacitor pack 220.

The boost pack 210 has a relatively higher voltage than that of the capacitor pack 220 at the time when the drive of the engine 230 is completed and the capacitor pack 220 ) To form an equilibrium.

In this process, the operating conditions of the specific components according to the driving timing of the engine are shown in Table 1, taking the engine of the tractor as an example.

Here, the minimum voltage required to drive the tractor's engine is about 15V, and the maximum allowable voltage which does not cause damage to the other elements constituting the tractor is about 15.5 V, and the boost pack and the capacitor pack are connected to the battery cells 4S2P structure including eight battery cells and sixteen battery cells in total.

Engine
Driving point The first breaker
Connection status The second breaker
Connection status Boost Pack
Voltage state Capacitor pack
Voltage state Start On On 15V output 15V output On Off On 16.4V charge 14 ~ 15V
Charging and maintenance Off Off Off Maintain 16.4V Maintain 14.5V

1, both the first and second circuit breakers 231 and 232 maintain an "On" state at the start of driving of the engine 230, And drives the tractor engine 230 by outputting the same voltage of 15V.

Thereafter, the first breaker 231 is changed to the "Off" state in the process of maintaining the driving of the engine 230, thereby blocking the electrical connection of the boost pack 210 to the engine 230. [

The capacitor pack 220 maintains the electrical connection state with the engine 230 by keeping the second circuit breaker 232 in the ON state and accordingly the pulse current generated in accordance with the driving of the engine 230 , It is charged and maintained at a voltage of 14V to 15V with an average voltage of 14.5V and an error range of +/- 0.5V.

At this time, the boost pack 210 is controlled such that the voltage of the boost pack 210, which is balanced with the capacitor pack 220 having a relatively low voltage, is greater than or equal to 15V for driving the engine 230, Lt; / RTI &gt;

Thereafter, when the driving of the engine 230 is terminated, both the first circuit breaker 231 and the second circuit breaker 232 remain in the "Off" state, and the boost pack 210 and the capacitor pack 220 , Maintaining a voltage state of about 16.4V and 14.5V, respectively.

Therefore, at the start of driving of the engine 230, the boost pack 210 and the capacitor pack 220 are connected again to output the voltage of about 15 V, which is balanced, to drive the engine 230.

The maximum voltage of the capacitor pack 220 charged and maintained between the voltage output at the starting point of the engine 230 and the drive of the engine 230 is 15 V and does not cause damage to other elements constituting the tractor And maintains a voltage state of less than 15.5 V which is the maximum allowable voltage.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (21)

An engine-driven battery pack system,
A boost pack and a capacitor pack in which a plurality of battery cells are connected in series and in parallel, respectively;
A first circuit breaker and a second circuit breaker respectively regulating electrical connection of the boost pack and the capacitor pack to the engine; And
A micro control unit (MCU) for controlling the operation of the first circuit breaker and the second circuit breaker;
Lt; / RTI &gt;
Wherein the boost pack and the capacitor pack are adjusted in electrical connection with the engine according to the driving timing of the engine. The battery pack system according to claim 1, wherein the boost pack and the capacitor pack are electrically connected to the engine at the start of driving the engine. The battery pack system according to claim 1, wherein the boost pack and the capacitor pack output the same voltage and current at the start of driving the engine. 4. The fuel cell system according to claim 3, wherein the boost pack and the capacitor pack output a voltage and a current of 100% to 110% with respect to a minimum required voltage and current for starting driving of the engine, Battery pack system. The battery pack system according to claim 1, wherein the boost pack is electrically disconnected from the engine during driving of the engine. The battery pack system according to claim 1, wherein the voltage of the capacitor pack between the driving of the engine is charged and maintained within a predetermined error range having a constant pulse. The battery pack system according to claim 6, wherein the voltage of the capacitor pack is charged and maintained by driving of the engine. The battery pack system according to claim 6, wherein the error range of the voltage of the capacitor pack between the driving of the engine is ± 1% to ± 10% of the average voltage of the capacitor pack. 7. The battery pack system according to claim 6, wherein the maximum voltage of the capacitor pack between the driving of the engine is 85% to 95% of the maximum allowable voltage of the elements constituting the device to which the engine is applied. The battery pack system according to claim 1, wherein between the driving of the engine, the boost pack is charged at a voltage higher than an average voltage of the capacitor pack. The battery pack system according to claim 9, wherein between the driving of the engine, the boost pack is charged with a voltage of 110% to 120% with respect to an average voltage of the capacitor pack. The battery pack system according to claim 1, wherein each of the boost pack and the capacitor pack includes the same number of battery cells. The method according to claim 1, wherein the number of the battery cells constituting the boost pack and the capacitor pack is adjusted according to the voltage of the battery cells, the minimum voltage required for driving the engine, the type and application of the device to which the engine is applied A battery pack system characterized by. The battery pack system according to claim 1, wherein the battery cell is a lithium secondary battery. A method of operating an engine using the battery pack system according to claim 1,
f) outputting and applying the same voltage while both the boost pack and the capacitor pack are electrically connected to the engine;
g) starting the driving of the engine using the currents applied from the boost pack and the capacitor pack;
h) a process in which the connection of the boost pack to the engine is interrupted after the engine starts to be driven;
i) a process in which driving of the engine is maintained while the capacitor pack is electrically connected to the engine;
j) terminating the driving of the engine;
And an engine driving method for driving the engine. 16. The method according to claim 15, wherein in the step d), the capacitor pack is charged and held within a predetermined error range with a constant voltage pulse. 17. The method of claim 16, wherein the voltage of the capacitor pack is charged and maintained by driving the engine. The method according to claim 16, wherein the error range of the voltage of the capacitor pack is ± 1% to ± 10% of the average voltage of the capacitor pack. The method as claimed in claim 15, wherein, in step d), the boost pack is charged with a voltage of 110% to 120% with respect to an average voltage of the capacitor pack. A device comprising a battery pack system according to any one of the preceding claims. 21. The device of claim 20, wherein the device is an industrial power plant or an agricultural power plant.

Images