Heat generation simulation device and operating method thereof

Abstract

A heat generation simulation device according to one embodiment disclosed in the present document may comprise: an initial value setting unit for setting an initial value including battery-related information and charging / discharging information; a model generation unit for generating a three-dimensional model of the battery; a heat flow rate identification unit for identifying the internal heat flow rate of the battery by using an electrochemical model based on the initial value; and an information generation unit for generating simulation information related to heat generation of the battery on the basis of the heat flow rate.

Description

Heat generation simulation device and its operating method

[0001] Cross-citation with related applications

[0002] This invention claims the benefit of priority from Korean Patent Application No. 10-2024-0053355, filed April 22, 2024, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The embodiments disclosed in this document relate to a heat generation simulation device and an operating method thereof.

[0005] Recently, active research and development has been conducted on secondary batteries. The term "secondary battery" refers to a rechargeable battery, encompassing both conventional Ni / Cd and Ni / MH batteries, as well as more recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries boast a significantly higher energy density than conventional Ni / Cd and Ni / MH batteries. Furthermore, lithium-ion batteries can be manufactured in a compact and lightweight form, making them a popular power source for mobile devices. Recently, their use has expanded to include power sources for electric vehicles, drawing attention as a next-generation energy storage medium.

[0006] As the industrial sector utilizing batteries expands, battery management systems (BMSs), which diagnose battery safety, are also evolving. BMSs utilize a variety of diagnostic algorithms to assess battery performance and implement appropriate control based on battery condition. One such diagnostic algorithm allows the BMS to detect battery heat and temperature and implement corresponding control. Consequently, BMSs can implement appropriate control based on battery heat and temperature, preventing battery damage, shortened lifespan, and fires caused by overheating.

[0007] To accurately calculate battery heat and temperature, there are methods that utilize software simulations that monitor electrochemical reactions within the battery, as well as methods that involve actual battery operation. For example, electrochemical models of batteries can be used to monitor chemical reactions occurring within the battery, and simulations can be performed in a virtual environment similar to the actual battery operating environment, saving experimental time and costs.

[0008] Typically, a BMS can sense the temperature outside the battery and perform corresponding control. However, there is a problem in that it cannot determine the heat generation and temperature distribution inside the battery.

[0009] The main cause of heat generation inside a battery is Joule heat generated by electrochemical reactions and current, but there is a problem in that the battery must be disassembled to detect the heat and temperature inside the battery.

[0010] The technical problems of the embodiments disclosed in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the descriptions below.

[0011] A heat generation simulation device according to an embodiment disclosed in this document may include an initial value setting unit that sets initial values ​​including information about a battery and charge / discharge information; a model generation unit that generates a three-dimensional model of the battery; a heat flux identification unit that identifies internal heat flux of the battery using an electrochemical model based on the initial values; and an information generation unit that generates simulation information related to heat generation of the battery based on the heat flux.

[0012] In one embodiment, the heat flux identification unit can divide the three-dimensional model into sub-models of a specified volume unit and identify a first heat flux in each of the sub-models.

[0013] In one embodiment, the information generating unit can generate first heat flux information that maps the first heat flux in each of the sub-models to the three-dimensional model.

[0014] In one embodiment, the heat generation simulation device further includes a current density identification unit that identifies a current density in a current collector of the battery, and the information generation unit can generate current density information based on the current density.

[0015] In one embodiment, the heat flux identification unit can identify a second heat flux in the collector based on the current density.

[0016] In one embodiment, the information generating unit can generate second heat flux information that maps the second heat flux in the entire body to the three-dimensional model.

[0017] In one embodiment, the information generating unit can generate heat distribution information inside the battery based on the heat flux.

[0018] In one embodiment, the heat generation simulation device further includes a temperature calculation unit that calculates a temperature based on the heat flux, and the information generation unit can generate temperature distribution information that maps the temperature to the three-dimensional model.

[0019] In one embodiment, the model generation unit can map a two-dimensional model based on the internal shape of the battery and the three-dimensional model based on an Archimedean spiral trajectory.

[0020] A method for operating a heat generation simulation device according to an embodiment disclosed in this document may include: setting initial values ​​including information about a battery and charge / discharge information; generating a three-dimensional model of the battery; identifying an internal heat flux of the battery using an electrochemical model based on the initial values; and generating simulation information related to heat generation of the battery based on the heat flux.

[0021] In one embodiment, the act of identifying the heat flux may include the act of dividing the three-dimensional model into sub-models of a specified volume unit, and the act of identifying a first heat flux in each of the sub-models.

[0022] In one embodiment, the operation of generating the information may include an operation of generating first heat flux information that maps the first heat flux in each of the sub-models to the three-dimensional model.

[0023] In one embodiment, the method of operating the heat generation simulation device may further include an operation of identifying a current density in a current collector of the battery, and the operation of generating the information may include an operation of generating current density information based on the current density.

[0024] In one embodiment, the act of identifying the heat flux may include the act of identifying a second heat flux in the collector based on the current density.

[0025] In one embodiment, the act of generating the information may include an act of generating second heat flux information that maps the second heat flux in the collector to the three-dimensional model.

[0026] In one embodiment, the operation of generating the information may include an operation of generating heat distribution information inside the battery based on the heat flux.

[0027] In one embodiment, the method of operating the heat generation simulation device may further include an operation of calculating a temperature based on the heat flux, and the operation of generating the information may include an operation of generating temperature distribution information that maps the temperature to the three-dimensional model.

[0028] In one embodiment, the act of generating the model may map the three-dimensional model to a two-dimensional model based on the internal shape of the battery based on an Archimedean spiral trajectory.

[0029] The heat generation simulation device according to the various embodiments disclosed in this document can calculate the heat and temperature generated inside a battery by calculating the heat generated by electrochemical reactions, which are the main causes of heat generation, and the Joule heat generated by current. Furthermore, the aforementioned simulation can secure an optimal control algorithm that can prevent battery damage due to heat generation.

[0030] The effects of the heat generation simulation device and its operating method according to the disclosure of this document are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art according to the disclosure of this document.

[0031] FIG. 1 is a block diagram of a heat generation simulation system according to one embodiment disclosed in this document.

[0032] FIG. 2 is a block diagram of a heat generation simulation device included in a BMS (Battery Management System) according to one embodiment disclosed in this document.

[0033] FIG. 3 illustrates a two-dimensional model of the positive and negative electrodes of a cylindrical battery according to one embodiment disclosed in the present document.

[0034] FIG. 4 illustrates insulation conditions applied to a three-dimensional model of a cylindrical battery according to an embodiment disclosed in this document.

[0035] FIG. 5 illustrates a computing system that executes the operation of a heat generation simulation device according to one embodiment disclosed in this document.

[0036] FIGS. 6A and 6B illustrate a Graphical User Interface (GUI) implemented by a computing system that executes the operation of a heat generation simulation device according to one embodiment disclosed in the present document.

[0037] FIG. 7 illustrates temperature distribution information based on simulation results by a computing system according to one embodiment disclosed in this document.

[0038] FIG. 8 is a flowchart illustrating an operation method of a heat generation simulation device according to an embodiment disclosed in this document.

[0039] In connection with the description of the drawings, the same or similar reference numerals may be used for identical or similar components.

[0040] Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that the present invention encompasses various modifications, equivalents, and / or alternatives of the embodiments.

[0041] The embodiments and terminology used in this document are not intended to limit the technical features described in this document to a specific embodiment, but should be understood to encompass various modifications, equivalents, or alternatives of the embodiment. In connection with the description of the drawings, similar reference numerals may be used to refer to similar or related components. The singular form of a noun corresponding to an item may include one or more of the item, unless the relevant context clearly indicates otherwise.

[0042] In this document, the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" can each include any one of the items listed together in that phrase, or all possible combinations thereof. Terms such as "first", "second", "first", "second", "A", "B", "(a)", or "(b)" may be used merely to distinguish the corresponding component from other corresponding components, and do not limit the corresponding components in any other respect (e.g., importance or order) unless specifically stated otherwise.

[0043] In this document, when a component (e.g., a first component) is referred to as being “connected,” “coupled,” or “connected,” with or without the terms “functionally” or “communicatively,” or “coupled” or “connected,” it means that the component can be connected to the other component directly (e.g., wired or wirelessly), or indirectly (e.g., via a third component).

[0044] The methods according to various embodiments disclosed in this document may be provided as included in a computer program product. The computer program product may be traded as a commodity between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read-only memory, CD-ROM), or may be distributed online (e.g., downloaded or uploaded) through an application store or directly between two user devices. In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0045] According to the embodiments disclosed in this document, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to the embodiments disclosed in this document, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to the embodiments disclosed in this document, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

[0046] FIG. 1 is a block diagram of a heat generation simulation system according to one embodiment disclosed in this document.

[0047] Referring to Fig. 1, the heat generation simulation system (1) can simulate the heat distribution and temperature distribution inside the battery by identifying Joule heat based on heat and current flow caused by chemical reactions occurring inside the battery. By analyzing the heat distribution inside the battery and the resulting temperature distribution through the heat generation simulation system (1), the battery can be safely operated according to the heat and temperature inside the battery.

[0048] The heat generation simulation system (1) can identify information related to heat inside the battery. Here, the heat-related information can include information about electrochemical reactions, potential distribution, and / or current density distribution inside the battery.

[0049] The heat generation simulation system (1) can identify the electrochemical reaction heat in the electrodes and electrolyte inside the battery by using a modeled electrochemical model to identify the electrochemical reaction inside the battery. The heat generation simulation system (1) can identify the potential distribution and current density distribution by using a current density identification model. The heat generation simulation system (1) can map the identified electrochemical reaction heat, potential distribution, and current density distribution to a three-dimensional model that models the shape inside the battery.

[0050] The heat generation simulation system (1) may include a heat generation simulation device (10), an input device (12), and a display device (14). The input device (12) may be a device for inputting initial values ​​for simulation, and the display device (14) may be a device for displaying the input initial values, simulation process, and simulation results. In one embodiment, the initial values ​​may include information about a battery model (e.g., an electrochemical model), geometric information of battery components (e.g., length, width), information about an anode, information about an anode, information about a separator, and / or information about heat (e.g., specific heat capacity).

[0051] The heat generation simulation device (10) can experimentally create a database of data including battery information and charge / discharge conditions to set initial values ​​for identifying Joule heat based on electrochemical reactions and current flow generated inside the battery. Here, the information about the battery can include information about the type of battery (e.g., pack type, pouch type, or cylindrical type), the material of the components constituting the battery (e.g., positive electrode, negative electrode, and / or separator), the number and position of positive or negative electrode tabs, the resistivity value, and the size of each of the components (e.g., length and width), and can include experimental data about internal chemical reactions, lithium plating, heat generation, and aging degree based on a pre-secured electrochemical model of the battery.

[0052] The heat generation simulation device (10) can identify internal chemical reactions using an electrochemical model. The electrochemical model may be software modeled to perform calculations related to heat conduction equations, half-reactions for each electrode, mass transfer reaction equations, the Butler-Volmer equation, and charge conservation equations. The electrochemical model can calculate internal chemical reactions using the above reaction equations and equations, and identify heat generated accordingly.

[0053] The heat generation simulation device (10) can set up a virtual environment as close as possible to the environment in which the actual battery is operated by pre-databatchifying the aforementioned experimental data and setting it as an initial value. The aforementioned experimental data can be acquired through experiments and can be databased in an external device or the heat generation simulation device (10). The heat generation simulation device (10) can use the databased data during the simulation process to generate information related to the internal heat of the battery based on the initial value.

[0054] The heat generation simulation device (10) may include an initial value setting unit (100), a model generation unit (102), a heat flux identification unit (104), and an information generation unit (106). According to an embodiment, the heat generation simulation device (10) may further include a current density identification unit (108) and / or a temperature calculation unit (110). In addition, according to an embodiment, the heat generation simulation device (10) illustrated in FIG. 1 may further include at least one component (e.g., a memory device) other than the components illustrated in FIG. 1.

[0055] In Fig. 1, it is assumed that the battery is a cylindrical battery and that the cylindrical battery includes an electrode assembly in which a positive electrode, a negative electrode, and a separator are rolled in a jelly roll shape, but the present invention is not limited thereto.

[0056] The initial value setting unit (100) can set the initial value based on information about the battery and charge / discharge conditions.

[0057] The model generation unit (102) can generate a three-dimensional model of the battery. The model generation unit (102) can generate a three-dimensional model based on an image of the battery. Here, the image of the battery may include a CT (Computed Tomography) image and an X-ray image based on a non-destructive method, and may include an image obtained by actually disassembling the battery and photographing a cross-section. In the following description, it is assumed that the image of the battery is a CT image.

[0058] The model generation unit (102) can generate a three-dimensional model based on a CT image of the battery. The model generation unit (102) can generate a three-dimensional model based on the jelly roll shape of the battery.

[0059] The model generation unit (102) can generate a two-dimensional model for each of the positive and negative electrodes of the battery. The model generation unit (102) can generate the two-dimensional model based on information about the positive and negative electrodes included in the initial values. Here, the information related to the positive and negative electrodes can include information about the material, length, and height of the positive and negative electrodes.

[0060] In one embodiment, the model generation unit (102) can map a three-dimensional model and a two-dimensional model. The model generation unit (102) can generate a two-dimensional model corresponding to the three-dimensional model or can generate a three-dimensional model corresponding to the two-dimensional model. The model generation unit (102) can generate a two-dimensional model corresponding to a wound assembly including a positive electrode, a negative electrode, and a separator in a wound state in the three-dimensional model when unfolded. The model generation unit (102) can generate a three-dimensional model in which the two-dimensional model is wound in a jellyroll shape. Details of a method for mapping a three-dimensional model and a two-dimensional model will be described later with reference to FIG. 3.

[0061] The heat flux identification unit (104) can identify the internal heat flux of the battery. The heat flux identification unit (104) can identify the heat flux due to the electrochemical reaction inside the battery using an electrochemical model based on initial values.

[0062] In one embodiment, the heat flux identification unit (104) can divide the 3D model into sub-models of a specified volume unit or a specified area unit. Here, the sub-model may be a three-dimensional structure or a planar structure as a part of the 3D model. The sub-model may be configured to include an anode, a cathode, and a separator, and the entire set of sub-models may be a 3D model. Hereinafter, it is assumed that the sub-model is a three-dimensional structure including an anode, a cathode, and a separator. The heat flux identification unit (104) can identify a heat flux based on an electrochemical reaction in each of the sub-models. The heat flux identification unit (104) can identify a first heat flux due to an electrochemical reaction in each of the sub-models based on initial values ​​(e.g., charging current and charging voltage, etc.). Here, the heat flux according to the initial value may be calculated using an electrochemical model or identified through a lookup table databased through experimental data. The electrochemical model may be configured to include an anode, a cathode, and a separator, similar to the sub-model, and may be modeled software that obtains values ​​related to internal chemical reactions, exothermic reactions, and material transport by calculating the equations and reaction formulas described above.

[0063] The information generation unit (106) can generate simulation information related to heat generation of the battery based on the heat flux. The information generation unit (106) can generate first heat flux information based on the first heat flux by the electrochemical reaction in each of the sub-models. Here, the simulation information can include the first heat flux information based on the first heat flux in each of the sub-models, and with reference to the contents described below, can further include current density information based on the current density identified in the current collector, second heat flux information based on the current density, heat distribution information accumulating the first heat flux and the second heat flux, and temperature distribution information.

[0064] The current density identification unit (108) can identify the current density of each of the positive and negative electrodes. The current density identification unit (108) can identify the current density of each of the positive and negative current collectors based on initial values ​​(e.g., charging current and charging voltage).

[0065] In one embodiment, the heat flux identification unit (104) can identify the second heat flux in the current collector based on the current density identified by the current density identification unit (108). The information generation unit (106) can generate second heat flux information based on the second heat flux. The information generation unit (106) can generate heat distribution information by accumulating the first heat flux and the second heat flux identified by the heat flux identification unit (104) and mapping them to a three-dimensional model. Here, the heat distribution information can be mapped to the three-dimensional model by adding the Joule heat due to the current flowing in the positive and negative current collectors and the heat flux due to the electrochemical reaction within the sub-models in each of the regions corresponding to the three-dimensional model, and qtot of each region can be calculated and input to each region of the three-dimensional model.

[0066] The temperature calculation unit (110) can calculate the temperature based on the heat flux. The temperature calculation unit (110) can calculate the temperature based on the first heat flux and / or the second heat flux. For example, the temperature calculation unit (110) can calculate the first heat quantity of the sub-model based on the first heat flux of the sub-model and the volume or area of ​​the sub-model, and can calculate the temperature based on the first heat quantity. In addition, the temperature calculation unit (110) can calculate the second heat quantity based on the current density and initial value of the current collector (e.g., the resistivity value of the positive or negative current collector) and can calculate the temperature based on the second heat quantity.

[0067] In one embodiment, the temperature calculation unit (110) may calculate the temperature according to the first heat flux and / or the second heat flux based on boundary conditions. Here, the boundary conditions may include conditions regarding the outdoor air temperature, a prerequisite that the inside of the jellyroll is an adiabatic wall, and a condition that the temperature continuously increases during charging / discharging of the battery. The information generation unit (106) may further generate temperature distribution information based on the temperature calculated by the temperature calculation unit (110). The information generation unit (106) may generate temperature distribution information by mapping the first temperature based on the first heat flux and the second temperature based on the second heat flux to a three-dimensional model. The information generation unit (106) may generate the temperature distribution information based on a heat conduction equation. The heat conduction equation for generating the temperature distribution information by the information generation unit (106) may be expressed by Mathematical Expression 1.

[0068] [Mathematical Formula 1]

[0069]

[0070] Here, (ρc p ) jr may refer to the thermal diffusivity for a cylindrical battery in the shape of a jellyroll, ρ is the density of the battery, c p may refer to the specific heat capacity of the battery. is the self-heating rate, k is the thermal conductivity, and q tot may refer to the total heat flux. Here, q tot can be expressed by mathematical formula 2.

[0071] [Equation 2]

[0072]

[0073] Here, q jr , q ccp , and q ccn Each can be a heat flux in the sub-model, a heat flux per unit volume of the positive current collector, and a heat flux per unit volume of the negative current collector. x jr , x ccp , and x ccn Each can be a volume of a sub-model, a unit volume of a positive electrode collector, and a unit volume of a negative electrode collector q. jr , q ccp , and q ccn Each of them can be expressed by mathematical expressions 3 to 5.

[0074] [Equation 3]

[0075]

[0076] Here, φ, U(c s ), can refer to potential, OCP (Open Circuit Potential), and Peltier heating, respectively.

[0077] [Equation 4]

[0078]

[0079] Here, q ccp , i ccp , φ ccp may refer to the heat flux, current, and potential in the positive electrode collector, respectively.

[0080] [Equation 5]

[0081]

[0082] Here, q ccn , i ccn , φ ccn can refer to the heat flux, current, and potential in the negative electrode collector, respectively.

[0083] The information generation unit (106) can generate temperature distribution information based on the calculated temperature. The information generation unit (106) can generate temperature distribution information that maps the calculated temperature to a three-dimensional model.

[0084] FIG. 2 is a block diagram of a heat generation simulation device included in a BMS (Battery Management System) according to one embodiment disclosed in this document.

[0085] Referring to FIG. 2, the BMS (20) may be connected to battery units (21, 22, 23) and user terminals (24) via wires and / or wirelessly. Here, each of the battery units (21, 22, 23) may be a battery module, a battery pack, or a battery rack, and may include one or more battery cells (211, 212). According to an embodiment, the battery cells (211, 212) may be, but are not limited to, a lithium-ion (Li-ion) battery, a lithium-ion polymer (Li-ion polymer) battery, a nickel-cadmium (Ni-Cd) battery, a nickel-metal hydride (Ni-MH) battery, a lithium iron phosphate (LFP) battery, a nickel-cobalt manganese (NCM) battery, etc. In FIG. 2, only the battery cells (211, 212) included in the first battery unit (21) are described, but this is only for convenience of explanation, and the second battery unit (22) and the third battery unit (23) may also include a plurality of battery cells.

[0086] In one embodiment, the connection between the BMS (20) and the user terminal (24) may be a communication connection via a wired and / or wireless network.

[0087] In one embodiment, the BMS (20) and battery units (21, 22, 23) may be included in an electronic device. The electronic device may be a mobile device (e.g., a mobile phone, a laptop computer, a smart phone, a smart pad), an electric vehicle (e.g., an electric vehicle (EV), a hybrid EV (HEV), a plug-in HEV (PHEV), a fuel cell EV (FCEV)), an energy storage system (ESS), or a battery swapping system (BSS).

[0088] In one embodiment, the user terminal (24) may be a device that monitors the simulation process and results by the operations of the heat generation simulation device (10), and may be a mobile device (e.g., a mobile phone, a laptop computer, a smart phone, a smart pad), or a personal computer (PC).

[0089] Referring to FIG. 2, the BMS (20) may include a sensor (200), a heat generation simulation device (10), and a communication circuit (240). According to an embodiment, the BMS (20) illustrated in FIG. 2 may further include at least one component (e.g., a display, an input device, or an output device) other than the components illustrated in FIG. 2. According to an embodiment, the heat generation simulation device (10) may be a processor including an algorithm for diagnosing heat distribution, and operations performed in the heat generation simulation device (10) may be one of the diagnosis algorithms performed by a processor (not illustrated) of the BMS (20).

[0090] The sensor (200) can obtain values ​​related to the status of the battery units (21, 22, 23). In one embodiment, the values ​​related to the status may represent one or more values ​​for voltage, current, resistance, state of charge (SOC), state of health (SOH), temperature, or a combination thereof of the battery units (21, 22, 23). Hereinafter, the values ​​related to the status may be referred to as 'status values'.

[0091] The heat generation simulation device (10) can generate heat flux information, current density information, heat quantity information, temperature information, or a combination thereof based on the status values ​​of the battery units (21, 22, 23) acquired through the sensor (200). Here, the heat generation simulation device (10) can generate heat flux information, current density information, heat quantity information, temperature information, or a combination thereof based on the status values ​​of the actual battery units (21, 22, 23) rather than the simulation. In this case, the heat generation simulation device (10) can generate the aforementioned information based on the status values ​​acquired by the sensor (200), instead of arbitrarily setting information about the battery by the initial value setting unit (100) in FIG. 1.

[0092] The communication circuit (240) can transmit the aforementioned information generated by the heat generation simulation device (10) to the user terminal (24).

[0093] In one embodiment, the communication circuit (240) can establish a wired communication channel and / or a wireless communication channel between the heat generation simulation device (10) and the user terminal (24), and transmit and receive data with the heat generation simulation device (10) and / or the user terminal (24) through the established communication channel. For example, the communication circuit (240) can transmit the aforementioned information to the user terminal (24).

[0094] FIG. 3 illustrates a two-dimensional model of the positive and negative electrodes of a cylindrical battery according to one embodiment disclosed in the present document.

[0095] Referring to FIG. 3, the heat generation simulation device (10) can generate a two-dimensional model (32) for the positive electrode and a two-dimensional model (34) for the negative electrode based on information about the positive electrode and negative electrode of the battery included in the initial values. Here, the information about the positive electrode and negative electrode may include the length and height of the positive electrode current collector and the negative electrode current collector, and the position of the positive electrode tab (320) and the position of the negative electrode tab (340).

[0096] In one embodiment, the heat generation simulation device (10) can map a three-dimensional model (30) and two-dimensional models (32, 34) of a positive electrode collector and a negative electrode collector. The heat generation simulation device (10) can generate two-dimensional models (32, 34) corresponding to the three-dimensional model (30). The heat generation simulation device (10) can generate the two-dimensional models (32, 34) based on the upper part of the three-dimensional model (30). Referring to the three-dimensional model (30), a winding assembly including a positive electrode, a negative electrode, and a separator can be wound n times in a jellyroll shape, and the winding number can include a first turn to an n-th turn based on a radius from an origin (R0). Here, the radius corresponding to each of the first turn to the n-th turn is a first radius (R1) to an n-th radius (R n ) is assumed and explained.

[0097] In one embodiment, the heat generation simulation device (10) can map a three-dimensional model (30) and two-dimensional models (32, 34) based on an Archimedean spiral trajectory. Here, the Archimedean spiral trajectory can be expressed by mathematical expression 6.

[0098] [Equation 6]

[0099]

[0100] Referring to mathematical expression 6, R i and bθ may refer to the polar coordinate components of the point corresponding to the ith turn, n is the number of turns, and L t can refer to the total length of a single cell.

[0101] The components (x-axis and y-axis) of the coordinate system of the two-dimensional model (32) for the positive electrode and the two-dimensional model (34) for the negative electrode may correspond to the length and height of the winding assembly, the positive electrode collector, or the negative electrode collector. For the x-axis of the two-dimensional models (32, 34), a length corresponding to the radius of the three-dimensional model (30) may be mapped. For example, the first radius (R1) to the n-th radius (R) of the three-dimensional model (30) n ) can be mapped to the x-axis of the two-dimensional models (32, 34) for the anode. Based on the method described above, by mapping the three-dimensional model (30) and the two-dimensional models (32, 34) or generating the two-dimensional models (32, 34) corresponding to the three-dimensional model (30), the current density mapped to the two-dimensional models (32, 34) and the second heat amount based on the current density can be mapped to the three-dimensional model (30). The height of the anode collector corresponding to the y-axis of the two-dimensional models (32, 34) can be the same as the height corresponding to the y-axis of the three-dimensional model.

[0102] In the above, it is explained on the premise that a two-dimensional model (32) for the positive electrode and a two-dimensional model (34) for the negative electrode are distinguished, but it is not limited thereto, and a two-dimensional model for a winding assembly including the positive electrode and the negative electrode can also be created according to the above-described method or mapped to a three-dimensional model (30).

[0103] FIG. 4 illustrates insulation conditions applied to a three-dimensional model of a cylindrical battery according to an embodiment disclosed in this document.

[0104] Referring to FIG. 4, any point included in the three-dimensional model (30) can be expressed as a coordinate based on the radius according to the number of turns and the axes (r-axis and z-axis) based on the height of the cylindrical battery.

[0105] A cross section (400) of the 3D model (30) is the i-th radius (R) according to the number of turns of the winding assembly. i ) and height (H). q crp is the boundary condition of the upper part of the jelly roll shape and q crn can refer to the boundary conditions at the bottom of the jelly roll shape. T b can be a boundary temperature (e.g., outside temperature), and T k may refer to the outer temperature of a jelly roll shape according to unit height. The heat distribution information and / or temperature distribution information inside the battery may be generated based on the above boundary conditions.

[0106] The heat generation simulation device (10) can input the first heat flux of the sub-model corresponding to one section (400) and the second heat flux of the collector corresponding to one section (400). The heat generation simulation device (10) can generate heat flux information and heat distribution information for one section (400), and can generate temperature distribution information based thereon.

[0107] FIG. 5 illustrates a computing system that executes the operation of a heat generation simulation device according to one embodiment disclosed in this document.

[0108] Referring to FIG. 5, a computing system (50) of a heat generation simulation device (10) according to one embodiment disclosed in this document may include an MCU (500), a memory (510), an input / output I / F (520), and a communication I / F (530).

[0109] The MCU (500) may be a processor that executes various programs (e.g., a battery diagnostic program) stored in the memory (510), processes various data from these programs, and performs the functions of the heat generation simulation device (10) shown in the aforementioned FIGS. 1 to 5.

[0110] The memory (510) can store various programs related to the operation of the heat generation simulation device (10). In addition, the memory (510) can store operation data of the heat generation simulation device (10).

[0111] Such memories (510) may be provided in multiples as needed. The memories (510) may be volatile memories or non-volatile memories. As volatile memories (510), RAM, DRAM, SRAM, etc. may be used. As non-volatile memories (510), ROM, PROM, EAROM, EPROM, EEPROM, flash memories, etc. may be used. The examples of memories (510) listed above are merely examples and are not limited to these examples.

[0112] The input / output I / F (520) can provide an interface that enables data transmission and reception between an input device such as a keyboard, mouse, or touch panel and an output device such as a display and the MCU (500).

[0113] The communication I / F (530) is a component capable of transmitting and receiving various data with the server, and may be any device capable of supporting wired or wireless communication. For example, programs for resistance measurement and abnormality diagnosis, as well as various data, can be transmitted and received from a separately provided external server via the communication I / F (530).

[0114] FIGS. 6A and 6B illustrate a Graphical User Interface (GUI) implemented by a computing system that executes the operation of a heat generation simulation device according to one embodiment disclosed in the present document.

[0115] Referring to FIGS. 6a and 6b, an initial value input screen (600) and a simulation result screen (620) can be output through the computing system (50) disclosed in FIG. 5.

[0116] Referring to the initial value input screen (600), there are multiple input fields (602) related to the initial value. The multiple input fields (602) may include an input field for information related to the battery model and chemical reaction to be used (solver control), an input field for information related to the initial simulation value (initial condition), an input field for information related to the battery component material (Newman), an input field for aging information (aging), and an input field for lithium plating information (Li plating). Here, data based on experimental data stored in a database may be input into the multiple input fields (602) through the input / output I / F (520).

[0117] The MCU (500) can perform a simulation of heat generation inside the battery based on the initial value, and the simulation result can be output on a simulation result screen (620) through an input / output I / F (520). Here, the simulation result screen (620) can include current density information (622) based on the current flowing through each of the positive electrode current collector and the negative electrode current collector, and second heat flux information (624) based on the current density information (622).

[0118] Referring to the current density information (622), it may include the intensity and distribution of the current density at the positive or negative electrode of the battery. The current may flow to the positive or negative current collector, and based on the fact that it ultimately flows in the direction of the positive or negative tab, the area where the positive or negative tab is located can be identified.

[0119] The second heat flux information (624) may include the intensity and distribution of the heat flux based on the current density. Referring to the second heat flux information (624), the area with the highest heat flux intensity can be identified based on the length and height of the anode or cathode.

[0120] FIG. 7 illustrates temperature distribution information based on simulation results by a computing system according to one embodiment disclosed in this document.

[0121] Referring to FIG. 7, the heat generation simulation device (10) can generate current density information (710). The heat generation simulation device (10) can generate first heat flux information based on an electrochemical model (700). The heat generation simulation device (10) can generate second heat flux information based on the current density information (710), and can input the first heat flux information and the second heat flux information into a three-dimensional model (30, see FIGS. 3 and 4) to generate heat distribution information (722).

[0122] The heat generation simulation device (10) can generate temperature distribution information (724) based on heat distribution information (722). The heat generation simulation device (10) can input the second heat flux calculated based on the first heat flux and current density of each sub-model into a three-dimensional model to generate heat distribution information (722) and temperature distribution information (724). The heat distribution information (722) and temperature distribution information (724) may be dynamic information reflecting heat conduction over time.

[0123] FIG. 8 is a flowchart illustrating an operation method of a heat generation simulation device according to an embodiment disclosed in this document.

[0124] Referring to FIG. 8, in operation 800, the heat generation simulation device (10) can set initial values ​​for simulation. Here, the initial values ​​can include information about the battery and charge / discharge information described in FIG. 1.

[0125] The heat generation simulation device (10) can generate a model for a battery. The heat generation simulation device (10) can generate a three-dimensional model of the battery. The heat generation simulation device (10) can generate the three-dimensional model based on a CT image of the battery. The heat generation simulation device (10) can generate the three-dimensional model based on the jelly roll shape of the battery.

[0126] The heat generation simulation device (10) can generate a two-dimensional model for each of the positive and negative electrodes of the battery. The heat generation simulation device (10) can generate the two-dimensional model based on information about the positive and negative electrodes included in the initial values.

[0127] In one embodiment, the heat generation simulation device (10) can map a three-dimensional model and a two-dimensional model. The heat generation simulation device (10) can generate a two-dimensional model corresponding to the three-dimensional model or can generate a three-dimensional model corresponding to the two-dimensional model. The heat generation simulation device (10) can generate a two-dimensional model corresponding to the wound assembly including the positive electrode, the negative electrode, and the separator in a wound state when unfolded in the three-dimensional model.

[0128] In operation 802, the heat generation simulation device (10) can identify information regarding heat inside the battery. The heat generation simulation device (10) can identify heat flux inside the battery. The heat generation simulation device (10) can identify internal heat flux of the battery. The heat generation simulation device (10) can identify internal heat flux of the battery using an electrochemical model based on initial values.

[0129] In one embodiment, the heat generation simulation device (10) can divide the three-dimensional model into sub-models of a specified volume unit or a specified area unit. The heat generation simulation device (10) can identify a first heat flux based on an electrochemical reaction in each of the sub-models. The heat generation simulation device (10) can identify a first heat flux due to an electrochemical reaction in each of the sub-models based on initial values ​​(e.g., charging current and charging voltage).

[0130] In one embodiment, the heat generation simulation device (10) can identify the potential distribution and / or current density of each of the positive and negative electrodes. The heat generation simulation device (10) can identify the current density of each of the positive and negative current collectors based on initial values ​​(e.g., charging current and charging voltage). The heat generation simulation device (10) can identify the second heat flux in the current collector based on the identified current density.

[0131] In one embodiment, the heat generation simulation device (10) can calculate a temperature based on a heat flux. The heat generation simulation device (10) can calculate a temperature based on a first heat flux and / or a second heat flux. The heat generation simulation device (10) can calculate a temperature based on the first heat flux and / or the second heat flux based on boundary conditions.

[0132] In operation 804, the heat generation simulation device (10) can generate simulation information. The heat generation simulation device (10) can generate simulation information based on the identified heat flux, potential distribution, current density, and / or temperature distribution.

[0133] In one embodiment, the heat generation simulation device (10) can generate first heat flux information based on the first heat flux by the electrochemical reaction in each of the sub-models.

[0134] In one embodiment, the heat generation simulation device (10) can generate current density information based on the current density.

[0135] In one embodiment, the heat generation simulation device (10) can generate second heat flux information regarding the second heat flux based on the current density.

[0136] In one embodiment, the heat generation simulation device (10) can generate heat distribution information mapped to a three-dimensional model by adding the first heat flux and the second heat flux.

[0137] In one embodiment, the heat generation simulation device (10) can generate temperature distribution information based on the calculated temperature. The heat generation simulation device (10) can generate temperature distribution information that maps the calculated temperature to a three-dimensional model.

[0138] The terms "include," "comprise," or "have" used herein, unless otherwise specifically stated, imply that the corresponding component may be included, and therefore should be interpreted to include other components rather than to exclude other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments disclosed in this document pertain, unless otherwise defined. Commonly used terms, such as terms defined in dictionaries, should be interpreted to be consistent with their contextual meaning in the relevant art, and shall not be interpreted in an idealized or overly formal sense, unless explicitly defined in this document.

[0139] The above description is merely an example of the technical idea disclosed in this document, and those skilled in the art to which the embodiments disclosed in this document pertain may make various modifications and variations without departing from the essential characteristics of the embodiments disclosed in this document. Therefore, the embodiments disclosed in this document are not intended to limit the technical idea of ​​the embodiments disclosed in this document, but to explain it, and the scope of the technical idea disclosed in this document is not limited by these embodiments. The scope of protection of the technical idea disclosed in this document should be interpreted by the claims below, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of rights of this document.

Claims

1. An initial value setting unit that sets initial values ​​including information about the battery and charge / discharge information; A model generation unit that generates a three-dimensional model of the above battery; A heat flux identification unit for identifying the internal heat flux of the battery using an electrochemical model based on the initial values; and Including an information generation unit that generates simulation information related to heat generation of the battery based on the heat flux. Heat generation simulation device.

2. In claim 1, The above heat flux identification unit, Dividing the above 3D model into sub-models of a specified volume unit and identifying the first heat flux in each of the sub-models, Heat generation simulation device.

3. In claim 2, The above information generation unit, Generating first heat flux information by mapping the first heat flux in each of the above sub-models to the three-dimensional model, Heat generation simulation device.

4. In claim 1, Further comprising a current density identification unit for identifying the current density in the current collector of the above battery, The above information generation unit, Generating current density information based on the above current density, Heat generation simulation device.

5. In claim 4, The above heat flux identification unit, Identifying the second heat flux in the collector based on the current density; Heat generation simulation device.

6. In claim 5, The above information generation unit, Generating second heat flux information by mapping the second heat flux in the above collector to the three-dimensional model, Heat generation simulation device.

7. In claim 1, The above information generation unit, Generating heat distribution information inside the battery based on the heat flux, Heat generation simulation device.

8. In claim 7, Further comprising a temperature calculation unit for calculating a temperature based on the above heat flux, The above information generation unit, Generating temperature distribution information by mapping the above temperature to the above 3D model, Heat generation simulation device.

9. In claim 1, The above model generation unit, Mapping the two-dimensional model based on the internal shape of the battery and the three-dimensional model based on the Archimedean spiral trajectory, Heat generation simulation device.

10. Action to set initial values ​​including information about the battery and charge / discharge information; An action of creating a three-dimensional model of the above battery; An operation of identifying the internal heat flux of the battery using an electrochemical model based on the initial values; and An operation for generating simulation information related to heat generation of the battery based on the heat flux, Method of operation of a heat generation simulation device.

11. In claim 10, The operation of identifying the above heat flux is as follows: An operation of dividing the above 3D model into sub-models of specified volume units, and comprising an operation of identifying a first heat flux in each of the above sub-models; Method of operation of a heat generation simulation device.

12. In claim 11, The action of generating the above information is: An operation of generating first heat flux information by mapping the first heat flux in each of the above sub-models to the three-dimensional model, Method of operation of a heat generation simulation device.

13. In claim 10, Further comprising an operation of identifying the current density in the current collector of the above battery, The action of generating the above information is: Including an operation of generating current density information based on the above current density, Method of operation of a heat generation simulation device.

14. In claim 13, The operation of identifying the above heat flux is as follows: An operation of identifying a second heat flux in the collector based on the current density, Method of operation of a heat generation simulation device.

15. In claim 14, The action of generating the above information is: An operation of generating second heat flux information by mapping the second heat flux in the above-described collector to the three-dimensional model, Method of operation of a heat generation simulation device.

16. In claim 10, The action of generating the above information is: An operation for generating heat distribution information inside the battery based on the heat flux, Method of operation of a heat generation simulation device.

17. In claim 16, Further comprising an operation of calculating a temperature based on the heat flux, The action of generating the above information is: An operation for generating temperature distribution information by mapping the above temperature to the above three-dimensional model is included. Method of operation of a heat generation simulation device.

18. In claim 10, The action of generating the above model is: Mapping the two-dimensional model based on the internal shape of the battery and the three-dimensional model based on the Archimedean spiral trajectory, Method of operation of a heat generation simulation device.

Images