System and method for estimating performance state of all-solid-state battery

Abstract

To provide a performance state estimation system and an estimation method for an all-solid-state battery capable of estimating the performance state of a battery with improved reliability regardless of the state of charge and temperature of a battery.SOLUTION: The present invention relates to a performance state estimation system and estimation method for an all-solid-state battery which senses the amount of hydrogen sulfide generated in a cell of an all-solid-state battery and utilizes the amount of hydrogen sulfide as a performance state estimation factor of a battery. According to an embodiment of the present invention, a performance state estimation method of the all-solid-state battery includes the steps of: detecting whether hydrogen sulfide is generated in each cell of the all-solid-state battery; and estimating the state of health (SOH) of the all-solid-state battery corresponding to the amount of detected hydrogen sulfide generated on the basis of the data prepared in advance.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a system and method for estimating the performance state of an all-solid-state battery, and more particularly to a system and method for estimating the performance state of an all-solid-state battery, which senses the amount of hydrogen sulfide generated in a cell of the all-solid-state battery and utilizes the amount as an estimation factor for the performance state of the battery. [Background technology]

[0002] Lithium-ion secondary batteries are widely used in portable electronic devices such as smartphones and laptops, and are an essential component of environmentally friendly electric vehicles, so a great deal of research is being conducted on lithium-ion secondary batteries. Currently widely used lithium ion secondary batteries use electrolytes containing flammable organic solvents. Therefore, if the lithium ion secondary battery is subjected to a lot of external shocks and the cell is placed in an uncontrollable environment, it may lead to serious safety issues. Therefore, apart from the basic structure of the battery cell, additional materials are applied to improve safety or additional safety devices are installed.

[0003] Due to such safety concerns, all-solid-state batteries have recently appeared. All-solid-state batteries are batteries in which the existing electrolyte solution containing an organic solvent is replaced with a solid electrolyte, and can fundamentally solve the safety issues of conventional batteries. Candidates for solid electrolytes include sulfide-based solid electrolytes, oxide-based solid electrolytes, and organic solid electrolytes, and sulfide-based solid electrolytes, which have relatively high ionic conductivity, are attracting a great deal of attention.

[0004] There are several features of solid-state batteries compared to existing lithium-ion secondary batteries. First, the adoption of solid electrolytes ensures fundamental safety. Therefore, cell sensing and safety devices from existing batteries are eliminated, enabling an increase in energy density per battery pack. In addition, the adoption of next-generation high-performance electrodes such as lithium anodes, high-voltage cathodes, and sulfur cathodes, which are not applicable to existing batteries, makes it possible to overcome the performance limitations of existing lithium-ion secondary batteries. Finally, by utilizing the safety of solid electrolytes, solid-state batteries can realize high-voltage cells that apply a bipolar electrode design in which the cathode and anode are stacked in series, thereby achieving high energy density.

[0005] As described above, the voltage safety of the solid electrolyte in the all-solid-state battery enables the realization of a bipolar structure and the reduction of parts by omitting a cell balancing device, etc. However, if the battery's exterior material is damaged during long-term use, or if the sealing performance of the sealing part in the exterior material is reduced, allowing moisture to enter the interior of the exterior material, the generation of hydrogen sulfide from the sulfide-based solid electrolyte can become a problem. Therefore, it is necessary to develop technology that can detect the risk of hydrogen sulfide gas generation and estimate the state of health (SOH) of solid-state batteries at the same time. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent Registration No. 10-1619634 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been devised to solve the above-mentioned problems, Provided is a system and method for estimating the performance state of an all-solid-state battery, which can estimate the performance state of a battery with improved reliability regardless of the state of charge, temperature, etc. of the battery. The objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those having knowledge in the technical field to which the present invention pertains (hereinafter, referred to as "ordinary engineers") from the following description. [Means for solving the problem]

[0008] In order to achieve the object of the present invention as described above and to achieve the characteristic functions of the present invention described below, the present invention has the following features.

[0009] According to some embodiments of the present invention, a method for estimating a performance state of an all-solid-state battery includes detecting whether or not hydrogen sulfide is generated in each cell of the all-solid-state battery, and estimating a State of Health (SOH) of the all-solid-state battery corresponding to the detected amount or increasing rate of hydrogen sulfide generation based on pre-prepared data.

[0010] According to some embodiments of the present invention, a system for estimating a performance state of an all-solid-state battery includes an all-solid-state battery having a plurality of cells and a hydrogen sulfide sensor configured to measure an amount or an increase rate of hydrogen sulfide in each cell, and includes an all-solid-state battery management system configured to receive the amount or the increase rate of hydrogen sulfide measured in each cell, and to estimate a performance state of the all-solid-state battery based on the received amount or the increase rate of hydrogen sulfide generation. Effect of the Invention

[0011] According to the present invention, there is provided a system and method for estimating the performance state of an all-solid-state battery, which can estimate the performance state of the battery with improved reliability regardless of the state of charge and temperature of the all-solid-state battery. The effects of the present invention are not limited to those described above, and other effects not mentioned will be clearly recognized by those skilled in the art from the following description. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic cross-sectional view of an all-solid-state battery. [Diagram 2] FIG. 1 is a cross-sectional view of a cell of an all-solid-state battery according to the present invention. [Diagram 3] FIG. 1 shows a hydrogen sulfide sensor according to an embodiment of the present invention. [Figure 4] FIG. 1 is a configuration diagram of a performance state estimation system for an all-solid-state battery according to the present invention. [Diagram 5] 1 is a graph showing the determination of capacity degradation due to charge / discharge durability of a lithium ion secondary battery. [Figure 6] 1 is a flow chart of a method for estimating the performance state of an all-solid-state battery according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The specific structure or function described in the embodiments of the invention is merely exemplary for the purpose of describing the embodiments according to the concept of the invention, which may be embodied in various forms, and should not be construed as being limited to the embodiments described herein, but should be construed as including all modifications, equivalents, and alternatives within the spirit and scope of the invention.

[0014] Meanwhile, in the present invention, the terms "first" and / or "second" are used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing a certain component from another component, for example, a first component may be named as a second component, and similarly, a second component may be named as a first component, within the scope of the concept of the present invention.

[0015] When a component is said to be "coupled" or "connected" to another component, it should be understood that it may be directly coupled or connected to the other component, but that there may be other components between them. On the other hand, when a component is said to be "directly coupled" or "directly connected" to another component, it should be understood that there are no other components between them. Other expressions used to describe the relationship between components, such as "between" and "directly between," or "adjacent to" and "directly adjacent to," should be understood in the same way.

[0016] The same reference numerals refer to the same elements throughout the specification. However, the terms used in the specification are for the purpose of describing the embodiments and are not intended to limit the invention. In the specification, the singular includes the plural unless otherwise stated. As used in the specification, "comprises" and / or "comprising" does not exclude the presence or addition of one or more other elements, steps, operations and / or elements to a referenced element, step, operation and / or element.

[0017] The state of performance (SOH), which means the degree of capacity degradation of a battery, is a parameter that quantitatively indicates the change in the capacity of the battery and indicates how much the capacity of the battery has deteriorated. Therefore, the SOH can be used to replace the battery at an appropriate time, and the charge / discharge capacity of the battery can be adjusted according to the period of use of the battery to prevent overcharging and over-discharging of the battery. Therefore, it is very important to have a method for estimating the SOH of a battery more accurately and reliably.

[0018] Therefore, the present invention provides a more reliable method by combining two estimation factors to estimate the performance state of a battery. The present invention will now be described in detail with reference to the accompanying drawings.

[0019] As shown in FIG. 1, the all-solid-state battery cell 10 includes a positive electrode layer 12, a negative electrode layer 14, and a solid electrolyte layer 16, and the positive electrode layer 12, the negative electrode layer 14, and the solid electrolyte layer 16 are sequentially stacked at least once to form an electrode stack 20. The positive electrode layer 12 includes a positive electrode material, a sulfide-based solid electrolyte, a conductive material, a binder, and a solvent, and the negative electrode layer 14 includes a negative electrode material, a sulfide-based solid electrolyte, a conductive material, a binder, and a solvent. The solid electrolyte layer 16 includes a sulfide-based solid electrolyte, a binder, and a solvent, and the positive electrode layer 12 and the negative electrode layer 14 are disposed on both sides of the solid electrolyte layer 16, respectively. The positive electrode layer, the negative electrode layer, and the solid electrolyte layer may be made of known materials, and therefore a detailed description thereof will be omitted.

[0020] As shown in Fig. 2, the electrode laminate 20 of the all-solid-state battery cell 10 is sealed in an exterior material 30. The electrode laminate 20 is sealed by the exterior material 30 or a pouch, and the inside of the all-solid-state battery cell 10 can be isolated from moisture. For this purpose, a sealing portion 32 is provided on the outer periphery of the exterior material 30. A lead tab 40 of the electrode protrudes through the exterior material 30, and a current path to the outside of the battery is provided through the lead tab 40. The gap between the lead tab 40 and the exterior material 30 is also kept sealed against moisture.

[0021] According to the present invention, the all-solid-state battery cell 10 is provided with a hydrogen sulfide sensor 50. As shown in Fig. 3, the hydrogen sulfide sensor 50 is configured to detect hydrogen sulfide in the all-solid-state battery cell 10, and includes a sensing unit 52 and a signal emitting unit 54. The sensing unit 52 detects the amount of hydrogen sulfide generated inside the all-solid-state battery cell 10, and the signal emitting unit 54 transmits information related to the detected amount of hydrogen sulfide to the outside in real time.

[0022] According to an embodiment of the present invention, a portion of the hydrogen sulfide sensor 50 is disposed within the exterior material 30, and another portion of the hydrogen sulfide sensor 50 is disposed protruding outside the exterior material 30. The sensing portion 52 of the hydrogen sulfide sensor 50 may be disposed inside the exterior material 30, and the signal emitting portion 54 of the hydrogen sulfide sensor 50 may be disposed outside the exterior material 30.

[0023] According to an embodiment of the present invention, the hydrogen sulfide sensor 50 is a thin film type gas sensor. A known gas sensor may be used as the hydrogen sulfide sensor 50, and the sensing part 52 may be a thin film containing zirconium (Zr) or tin (Sn). Meanwhile, when the hydrogen sulfide sensor 50 is interposed in the sealing part 32 of the exterior material 30, it is preferable to have a thin film type gas sensor having a high space utilization rate. However, in the present invention, the hydrogen sulfide sensor 50 is not limited to a thin film type gas sensor, and other types of sensors may be used.

[0024] A configuration diagram of an all-solid-state battery performance state estimation system according to the present invention is shown in Fig. 4. The all-solid-state battery performance state estimation system includes an all-solid-state battery cell module 100 and an all-solid-state battery management system 200. The all-solid-state battery cell module 100 includes a plurality of all-solid-state battery cells 10, and each of the all-solid-state battery cells 10 is equipped with a hydrogen sulfide sensor 50. In the figure, a total of three cells, a first cell 10a, a second cell 10b, and a third cell 10c, are shown, but the number of cells may be increased or decreased depending on conditions.

[0025] The amount of hydrogen sulfide inside each cell 10 detected by the hydrogen sulfide sensor 50 is transmitted to the outside as an electrical signal. According to an embodiment of the present invention, the electrical signal detected by the hydrogen sulfide sensor 50 is transmitted to the all-solid-state battery management system 200.

[0026] The hydrogen sulfide sensor 50 is an oxide-based porous film that generates a current signal through a catalytic reaction, thereby enabling the measurement of hydrogen sulfide concentration and fluctuations. In order to ensure the reliability of the initial deterioration level, it is preferable that the amount of hydrogen sulfide generated detected by the hydrogen sulfide sensor 50 has an error of approximately 5% or less within the range of more than 0 to several tens of ppm (parts per million).

[0027] The all-solid-state battery management system 200 is configured to acquire information regarding the state of the all-solid-state battery cell module 100 from the all-solid-state battery cell module 100, and manage the state of charge (SoC), state of performance (SOH), etc. of the all-solid-state battery through modeling.

[0028] As shown in Figure 5, batteries generally experience a continuous loss of capacity due to various capacity degradation mechanisms as they are repeatedly charged and discharged. As a non-limiting example, degradation of the surface of the battery's positive electrode material increases the cell's internal resistance, and lithium is precipitated in the negative electrode layer. This causes the irreversible capacity to increase and the battery capacity to continue to decrease. Managing and predicting the rate of capacity degradation is very important for providing reliable information to users and managing battery systems.

[0029] Therefore, the all-solid-state battery management system 200 according to the present invention monitors capacity information and current-voltage factors from a battery module or cell and processes information thereon. The all-solid-state battery management system 200 is designed to provide a user with an estimated battery performance state result based on the processed information, while continuously updating the cell deterioration degree to minimize information errors.

[0030] According to the present invention, the all-solid-state battery management system 200 includes a first extraction unit 220, a second extraction unit 240, a performance state estimation unit 260 and an information processing and storage unit 280.

[0031] The first extraction unit 220 is configured to extract factors for estimating the performance state of the all-solid-state battery. In particular, the first extraction unit 220 is configured to derive factors based on the overall chemical reaction in the battery. To this end, the first extraction unit 220 collects data on the amount of hydrogen sulfide generated in each cell 10 from each hydrogen sulfide sensor 50 provided in the all-solid-state battery cell 10. The first extraction unit 220 is configured to extract the amount of hydrogen sulfide generated measured in real time by the hydrogen sulfide sensor 50, and calculate the rate of increase of hydrogen sulfide based on the amount of change in the amount of hydrogen sulfide generated over time. In addition, if the calculated amount of hydrogen sulfide generated exceeds a preset hydrogen sulfide critical value, the first extraction unit 220 may determine that this is an abnormal phenomenon in which the cell 10 is operating abnormally, and may stop operation of the cell.

[0032] As a non-limiting example, the first extraction unit 220 may extract factors required for estimating the performance state of the battery from the amount of hydrogen sulfide generated detected by the hydrogen sulfide sensor 50 in the manner described below. Since the content of sulfide material varies depending on the specifications of the battery cell, the amount of hydrogen sulfide generated used for estimating the performance state of the battery is a relative value rather than an absolute value measured by the hydrogen sulfide sensor 50. That is, the amount of sulfur (S) element decomposed or released is obtained through the detected amount of hydrogen sulfide (ppm) detected by the hydrogen sulfide sensor 50, and the amount of hydrogen sulfide generated, which is the amount of sulfur (S) element decomposed or released relative to the total amount of sulfur (S) element contained in the materials constituting the cell, is derived as a percentage. Therefore, by using the normalized amount of hydrogen sulfide generated, rather than the value actually detected by the hydrogen sulfide sensor 50, for estimating the performance state of the battery, the value extracted by the first extraction unit 220 can be used for estimating the performance state regardless of the specifications of the cell.

[0033] According to the present invention, the capacity deterioration or performance state of the all-solid-state battery is estimated from the change in the amount of hydrogen sulfide detected from each cell 10. That is, the performance state of the all-solid-state battery is evaluated by calculating the reactivity of the sulfide-based solid electrolyte. As a non-limiting example, when the interfacial contact between the electrodes and the electrolyte in the battery decreases with use, the internal resistance of the battery increases and the structure of the solid electrolyte is decomposed. As a result, the generation of hydrogen sulfide increases, and the deterioration of the battery can be detected. As another non-limiting example, when moisture flows into the inside of the all-solid-state battery from the outside, the solid electrolyte reacts with the flowed-in moisture and the generation of hydrogen sulfide increases. Therefore, according to the present invention, the capacity deterioration of the all-solid-state battery can be predicted by detecting the generation of hydrogen sulfide in the cell. According to the present invention, the reliability of the existing performance state estimation method can be improved by utilizing the characteristic that hydrogen sulfide is generated when the solid electrolyte is deteriorated. In addition, the amount of hydrogen sulfide generated can be measured in real time regardless of the state of charge (SoC) of the cell 10, and an abnormal phenomenon such as the inflow of moisture from the outside can be detected.

[0034] The second extractor 240 is also configured to extract factors for estimating the performance state of the all-solid-state battery, in particular, to extract factors based on electrochemical reactions. More specifically, the second extractor 240 is configured to collect current-voltage data during charging of the battery and collect capacity data of the all-solid-state battery based on full charge.

[0035] The first extraction unit 220 and the second extraction unit 240 may be integrated with each other, but are preferably provided separately. According to some embodiments of the present invention, information processing on the amount of hydrogen sulfide generated is configured to be performed in the first extraction unit 220 separately from the second extraction unit 240. This is to provide a separate function such that the first extraction unit 220 can process hydrogen sulfide or cut off current when an abnormality occurs due to cell damage of the solid-state battery, in addition to the function of estimating the performance state of the solid-state battery, as the second extraction unit 240 does.

[0036] The performance state estimation unit 260 estimates the performance state of the all-solid-state battery based on the data collected by the first extraction unit 220 and the second extraction unit 240.

[0037] In relation to the data extracted by the first extraction unit 220, the information processing and storage unit 280 holds data in which hydrogen sulfide generation amount values ​​are organized by battery state of health (SOH) (i.e., from SOH100 to SOH0. There is no specific unit for SOH, which is a performance state, but it is assumed that a cell at the initial stage of manufacture is SOH 100 and a completely deteriorated state is SOH 0) previously obtained from experiments. As a non-limiting example, such organized data may be a lookup table in which hydrogen sulfide generation amount values ​​for each SOH stage are organized. The performance state estimation unit 260 can estimate the performance state of the cell 10 by comparing the amount of hydrogen sulfide generation extracted by the first extraction unit 220 with the values ​​in the lookup table.

[0038] The performance state estimation unit 260 also estimates the performance state by a discharge capacity factor based on the capacity data at the time of full charge extracted by the second extraction unit 240. The discharge capacity factor is extracted from the current integration result from the full charge (SoC 100) to full discharge (SoC 0) of the cell 10. A lookup table in which the performance state value of the battery corresponding to the discharge capacity factor is organized is obtained in advance by experiments, and such data is stored in the information processing and storage unit 280.

[0039] The performance state estimation unit 260 estimates the performance state of the battery through the current-voltage data during charging extracted by the second extraction unit 240. The second extraction unit 240 extracts the internal resistance of the cell 10 through the current-voltage data during charging. Using Ohm's law, the internal resistance is calculated from a voltage change signal according to an arbitrary current value. As the cell 10 ages, the internal resistance of the battery increases, so the performance state of the battery can be estimated. That is, the performance state estimation unit 260 includes a comparison standard arranged according to the specifications of the cell. For the comparison standard, the capacity of the battery is measured according to the internal resistance and temperature of the battery. Next, the measured capacity is converted into a relative value based on the initial capacity of the battery, thereby obtaining a lookup table for SOH mapping. Then, the internal resistance and temperature of the battery are measured in an actual usage environment, and the SOH corresponding to the internal resistance and temperature is mapped from the lookup table, so that the performance state of the battery can be estimated. According to the present invention, the estimation result by the first extraction section 220 is compared with the estimation result by the second extraction section 240, so that the reliability of the performance state estimation result can be further improved.

[0040] The information processing and storage unit 280 stores the results of the estimated performance state. That is, the information processing and storage unit 280 is configured to store collected information and update the stored information whenever the collected information changes. Also, as described above, the information processing and storage unit 280 stores reference values ​​(e.g., SOH values ​​for each amount of hydrogen sulfide generated) previously defined through test evaluation in the form of a lookup table. When the performance state estimation unit 260 determines the performance state, the information processing and storage unit 280 provides such comparison data, thereby enabling the performance state to be estimated by comparing the extracted values ​​extracted by the first extraction unit 220 or the second extraction unit 240, respectively.

[0041] Furthermore, the information processing and storage unit 280 updates and stores a real-time performance state according to the values ​​extracted by the first extraction unit 220 and the second extraction unit 240. When the performance state is estimated by the performance state estimation unit 260, the information processing and storage unit 280 updates and stores the estimated performance state in real time.

[0042] Furthermore, the information processing and storage unit 280 can identify the factors of deterioration based on the estimated performance state and store the identified factors of deterioration. That is, according to the present invention, the causes of deterioration can be understood and the battery can be managed according to the type of deterioration. There are several predicted causes of hydrogen sulfide generation in an all-solid-state battery, including, for example, deterioration of the positive electrode layer, deterioration due to chemical reactions of materials, and inflow of moisture from the outside.

[0043] The deterioration of the positive electrode layer is caused by the durability of the electrochemical reaction, and therefore, mutual correction is required between the signals of the first extraction unit 220 and the second extraction unit 240. That is, the influence of the deterioration of the positive electrode layer on the performance state of the battery can be examined by comparing the performance state obtained based on the signal of the first extraction unit 220 with the performance state obtained by the performance state estimation unit 260 based on the signal of the second extraction unit 240.

[0044] Deterioration due to a chemical reaction of the material corresponds to an interface reaction factor of the material that occurs over time or temperature regardless of an electrochemical reaction. Therefore, whether or not the deterioration is due to a chemical reaction of the material can be determined based on the performance state determined by the data of the first extraction unit 220. Since deterioration due to a chemical reaction of the material has less relevance to the performance state estimation compared to deterioration of the positive electrode layer, it is necessary to distinguish and manage the signal for the corresponding cell at the stage of storing in the information processing and storage unit 280.

[0045] In the case of moisture inflow from the outside, this is a purely chemical reaction unrelated to an electrochemical reaction, and it is necessary to estimate the performance state based on the data from the first extraction unit 220 alone.

[0046] According to the present invention, the information processing and storage unit 280 can classify the type of deterioration based on the performance state estimated based on the data of the first extraction unit 220 and the performance state estimated based on the data of the second extraction unit 240, and can classify and store the performance states according to the classified deterioration types.

[0047] For example, if there is a difference between the performance state calculated from the data of the first extractor 220 and the performance state calculated from the data of the second extractor 240, it is possible to identify whether the cause of deterioration is moisture intrusion from the outside, deterioration due to a chemical reaction of the material, or deterioration due to the positive electrode layer by comparing and analyzing the two values. Therefore, the present invention can detect the cause of deterioration more accurately. Ultimately, the present invention can manage the battery according to the type of deterioration.

[0048] As shown in FIG. 6, according to some embodiments of the present invention, a method for estimating a performance state of an all-solid-state battery is provided. In step S200, estimation of the performance state of the all-solid-state battery according to the present invention is started. Steps S201, S203, S205, and S207 relate to estimation factors of the battery performance state extracted by the second extractor 240, and steps S202, S204, S206, and S208 relate to factors extracted by the first extractor 220.

[0049] In step S201, it is determined whether the solid-state battery is being charged. If the solid-state battery is being charged, the second extractor 240 collects current-voltage data during charging (S203).

[0050] After the current-voltage data is collected, when charging of the all-solid-state battery is completed (S205), the second extraction unit 240 collects capacity data of the all-solid-state battery when fully charged (S207).

[0051] In step S210, the performance state of the solid-state battery is estimated by the performance state estimation unit 260 based on the current-voltage data during charging collected in step S203 and the full charge reference capacity data collected in step S207. As described above, the discharge capacity factor calculated from the capacity data at the time of full charge and the internal resistance calculated from the current-voltage data are compared with pre-arranged data to estimate the current state of health (SOH).

[0052] In addition, along with estimating the performance state by collecting current-voltage data during charging of the all-solid-state battery and collecting full-charge reference capacity data, the first extraction unit 220 detects the presence or absence of hydrogen sulfide generation in the all-solid-state battery (S202). The generation of hydrogen sulfide is detected by the hydrogen sulfide sensor 50 provided in each cell 10, and data on the amount of hydrogen sulfide generation measured by the hydrogen sulfide sensor 50 is collected (S204).

[0053] The amount of hydrogen sulfide generated collected in real time is continuously compared with a hydrogen sulfide critical value, which is a preset upper limit (S206). The hydrogen sulfide critical value is a preset value, and when the hydrogen sulfide critical value is exceeded, it is determined that an abnormal phenomenon has occurred in the solid-state battery. The hydrogen sulfide critical value may be changed depending on the capacity of the battery cell and the type of solid electrolyte, and may be 1,000 ppm as a non-limiting example.

[0054] If it is determined that the current amount of hydrogen sulfide generated exceeds the hydrogen sulfide critical value, the cell current of the solid-state battery is cut off (S208). According to the present invention, when the amount of hydrogen sulfide generated exceeds the hydrogen sulfide critical value, the cell current is cut off and disabled, thereby ensuring the safety of the battery pack.

[0055] If the amount of hydrogen sulfide generated is less than the hydrogen sulfide critical value, the performance state of the solid-state battery is estimated by the performance state estimation unit 260 based on the collected data on the amount of hydrogen sulfide generated (S210). As described above, the current performance state is estimated by comparing the SOH value according to the amount of hydrogen sulfide generated in a specific cell with a value in a pre-created table.

[0056] The estimation result of the performance state of the all-solid-state battery estimated in this manner is stored and updated in the information processing and storage unit 280, and the cause of deterioration can be identified by comparing the performance state determined based on the data of the first extraction unit 220 with the performance state determined based on the data of the second extraction unit 240. The identified deterioration factors are stored in a database together with the corresponding performance state values ​​by mutual correction of both.

[0057] In the past, the performance state of a battery could be estimated under specific conditions such as the state of charge and temperature of an all-solid-state battery, but according to the present invention, a reliable estimation is possible without such conditions. As a result, the system and method for estimating the performance state of a solid-state battery according to the present invention can improve the accuracy of estimating the state of health (SOH) of a battery cell by utilizing the characteristics of an all-solid-state battery.

[0058] According to the present invention, by reflecting the characteristics of an all-solid-state battery and further securing factor information of a chemical degradation mechanism in addition to the existing electrochemical degradation mechanism, it is possible to improve the reliability of the performance state estimation result of the battery. That is, according to the present invention, the performance state of the battery cell is estimated by collecting current-voltage data during charging and capacity data at full charge, and the hydrogen sulfide generation amount information is collected in real time using a hydrogen sulfide sensor, thereby improving the reliability of the performance state estimation result.

[0059] Moreover, according to the present invention, it is possible to additionally utilize the all-solid-state battery as a safety device when an abnormal phenomenon such as cell damage occurs.

[0060] The present invention described above is not limited to the above-mentioned embodiments and accompanying drawings, and it is obvious to a person having ordinary skill in the art to which the present invention pertains that various substitutions, modifications and changes are possible within the scope not departing from the technical idea of ​​the present invention. [Explanation of symbols]

[0061] 10 All-solid-state battery cells 12 Positive electrode layer 14 Negative electrode layer 16 Solid electrolyte layer 20 Electrode laminate 30 Exterior materials 32 Sealing section 40 Lead Tab 50 Hydrogen Sulfide Sensor 52 Sensing section 54 Signal emitter 100 All-solid-state battery cell module 200 All-solid-state battery management system 220 1st extraction part 240 Second extraction part 260 Performance status estimation unit 280 Information Processing and Storage Unit

Claims

1. Detecting whether or not hydrogen sulfide is generated in each cell of the all-solid-state battery; and estimating a state of health (SOH) of the solid-state battery corresponding to the detected amount or increasing rate of hydrogen sulfide based on pre-stored data; A method for estimating a performance state of an all-solid-state battery, comprising:

2. 2. The method of claim 1, further comprising cutting off current to any one of the cells of the solid-state battery when the amount or increasing rate of the hydrogen sulfide generation detected in the any one of the cells exceeds a predetermined hydrogen sulfide critical value.

3. collecting current-voltage data when the solid-state battery is charging, and collecting full-charge capacity data when the solid-state battery is fully charged; and 2. The method for estimating a performance state of the all-solid-state battery according to claim 1, further comprising: comparing the current-voltage data and the capacity data at full charge with the pre-prepared data set to estimate a performance state of the all-solid-state battery.

4. 4. The method for estimating a performance state of an all-solid-state battery according to claim 3, further comprising a step of comparing a first performance state estimated based on the amount of hydrogen sulfide generated with a second performance state estimated based on the current-voltage data and the capacity data at the time of full charge, and identifying a deterioration factor of the all-solid-state battery.

5. The method for estimating a performance state of an all-solid-state battery according to claim 4 , further comprising: compiling the first performance state, the second performance state, and the identified deterioration factors into a database.

6. The method of claim 4 , further comprising managing a performance state for each of the identified deterioration factors.

7. an all-solid-state battery including a plurality of cells and a hydrogen sulfide sensor configured to measure the amount or rate of increase of hydrogen sulfide in each cell; and an all-solid-state battery management system configured to receive the amount of hydrogen sulfide generated or the rate of increase measured in each cell, and to estimate a performance state of the all-solid-state battery based on the received amount of hydrogen sulfide generated or the rate of increase.

8. The all-solid-state battery management system is configured to estimate a performance state of the all-solid-state battery based on current-voltage data during charging and capacity data at full charge in the all-solid-state battery. The all-solid-state battery performance state estimation system according to claim 7.

9. The all-solid-state battery management system includes: a first extraction unit configured to extract, as a first factor, the amount of hydrogen sulfide generated or an increase rate of the hydrogen sulfide from the hydrogen sulfide sensor for determining a performance state of the all-solid-state battery; and and a second extraction unit configured to extract the current-voltage data during charging and the capacity data at full charge as a second factor for determining the performance state of the all-solid-state battery. The performance state estimation system for an all-solid-state battery according to claim 8, further comprising:

10. The all-solid-state battery management system further includes a performance state estimation unit, The performance state estimation unit is Estimating a first performance state corresponding to the first factor using a first data set prepared in advance; The system for estimating a performance state of an all-solid-state battery according to claim 9, characterized in that the system is configured to estimate a second performance state corresponding to the second factor by using a second data set prepared in advance.

11. The all-solid-state battery management system further includes an information processing and storage unit, the information processing and storage unit being:

11. The system for estimating a performance state of an all-solid-state battery according to claim 10, configured to store the first data set and the second data set, and to update and store the estimated first performance state and the estimated second performance state in real time.

12. 12. The system for estimating a performance state of an all-solid-state battery according to claim 11, wherein the information processing and storage unit is configured to compare the first performance state and the second performance state to identify a deterioration factor and store the identified deterioration factor.

13. The system for estimating a performance state of an all-solid-state battery according to claim 12 , wherein the all-solid-state battery management system is configured to manage a performance state for each of the identified deterioration factors.

14. 8. The system for estimating a performance state of an all-solid-state battery according to claim 7, wherein each cell is sealed with an exterior material, a part of the hydrogen sulfide sensor is disposed inside the exterior material, and another part of the hydrogen sulfide sensor is disposed outside the exterior material.

15. 8. The system for estimating the performance state of an all-solid-state battery according to claim 7, wherein the hydrogen sulfide sensor is a thin-film gas sensor.

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