Battery cell status management system and method

Abstract

A battery cell state management system according to an embodiment disclosed in this document includes an information acquisition unit that acquires information regarding an amount of electrolyte injected into a battery cell, and a controller that calculates a remaining amount of electrolyte in the battery cell based on an amount of electrolyte discharged from the battery cell and an amount of electrolyte injected into the battery cell in at least one of the manufacturing processes of the battery cell. The battery cell state management system according to the embodiment collects data necessary for calculating the remaining amount of electrolyte in conjunction with a battery cell assembly system that performs the manufacturing process, and can accurately calculate the remaining amount of electrolyte remaining inside a battery cell after the process is completed based on the collected data.

Description

[Technical Field]

[0001] The embodiments disclosed in this document claim the benefit of priority based on Korean Patent Application No. 10-2021-0154280, filed November 10, 2021, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference.

[0002] The embodiments disclosed in this document relate to a battery cell state management system that calculates the remaining amount of electrolyte in a battery cell, and a battery cell state management method that uses the same. [Background technology]

[0003] In recent years, the demand for high-performance, high-safety batteries has been increasing with the rapid development of the electrical, electronic, communication, and computer industries. Among these, lithium secondary batteries have been widely used in portable electronic devices in recent years due to their long lifespan and large capacity. Lithium secondary batteries are classified into lithium metal batteries and lithium ion batteries, which use liquid electrolytes, and lithium polymer batteries, which use solid polymer batteries, depending on the type of electrolyte. They are also classified into prismatic batteries, which use prismatic cans, cylindrical batteries, which use cylindrical cans, and pouch batteries, which use pouches, depending on the type of packaging material sealing the electrode assembly.

[0004] Pouch-type batteries are widely used due to their advantages of high energy density per unit weight and volume, the ability to reduce the thickness and weight of batteries, and low material costs for the exterior. The manufacturing process for pouch-type batteries includes a degassing process to remove gas from the battery. Unlike cylindrical or prismatic batteries, which have space inside the battery cell that can be occupied by gas, pouch-type batteries require a degassing process to remove unwanted gas from the pouch. After the degassing process, a folding process is performed in which the edges of the pouch are cut and welded.

[0005] During the degassing and folding processes, some of the electrolyte injected into the pouch may be expelled. An excessively low remaining amount of electrolyte can affect cycle performance, while an excessively high remaining amount can compromise safety. Therefore, it is necessary to maintain an appropriate level of remaining electrolyte in the battery cell during the polymer battery manufacturing process. While compact polymer batteries can be fully weighed during the degassing process, medium- to large-sized polymer batteries used in electric vehicles (EVs) cannot be fully inspected, and so sampling inspections are only performed when process changes occur. Furthermore, existing compact polymer batteries only calculate the remaining amount by considering the amount of electrolyte expelled during the degassing process, without taking into account the amount of electrolyte expelled during the folding process, resulting in significant discrepancies between the calculated and actual remaining amounts of electrolyte. Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the embodiments disclosed in this document is to provide a state management system and method that can accurately calculate the remaining amount of electrolyte inside a battery cell.

[0007] 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 following description. [Means for solving the problem]

[0008] A battery cell status management system according to one embodiment includes an information acquisition unit that acquires information regarding the amount of electrolyte injected into a battery cell, and a controller that calculates the remaining amount of electrolyte in the battery cell based on the amount of electrolyte discharged from the battery cell and the amount of electrolyte injected into the battery cell during at least one of the manufacturing processes for the battery cell.

[0009] According to one embodiment, the manufacturing process of the battery cell may include at least one of a packaging process of attaching an electrode assembly to a pouch and injecting an electrolyte into the pouch, an activation process of activating the battery cell package after the packaging process, a degassing process of discharging gas from the battery cell package, and a folding process of cutting a portion of the pouch and then sealing it.

[0010] According to one embodiment, the information acquisition unit acquires information regarding the weight of the battery cell package into which the electrolyte has been injected and the weight of the battery cell after the process has been completed, and the controller can calculate the amount of electrolyte discharged based on the weight of the battery cell package into which the electrolyte has been injected, the weight of the battery cell after the process has been completed, and the weight of the pouch cut during the battery cell manufacturing process.

[0011] According to one embodiment, the controller can calculate the weight of the cut pouches based on at least one of the length of the scrap of the cut pouches, the total length, the number of layers, and the weight of the pouches per unit area.

[0012] According to one embodiment, the controller can convert the weight of the cut pouch into a constant value and use it to calculate the amount of electrolyte discharged. According to one embodiment, the controller may provide a user with remaining electrolyte amount data for the battery cell when the remaining electrolyte amount for the battery cell is less than a first threshold or exceeds a second threshold.

[0013] According to one embodiment, the first threshold value or the second threshold value can be determined based on remaining electrolyte amount data of the battery cell and two or more other battery cells.

[0014] A battery cell manufacturing system according to one embodiment includes a battery cell assembly system that performs a battery cell manufacturing process, and a battery cell status management system that manages the remaining amount of electrolyte in battery cells for which the manufacturing process has been completed. The battery cell status management system includes an information acquisition unit that acquires information relating to the amount of electrolyte injected into the battery cells from the battery cell assembly system, and a controller that calculates the remaining amount of electrolyte in the battery cells based on the amount of electrolyte discharged from the battery cells and the amount of electrolyte injected into the battery cells during at least one of the battery cell manufacturing processes.

[0015] According to one embodiment, the battery cell assembly system may perform at least one of a packaging process in which an electrode assembly is attached to a pouch and an electrolyte is injected into the pouch; an activation process in which the battery cell package that has undergone the packaging process is activated; a degassing process in which gas is discharged from the battery cell package; and a folding process in which a portion of the pouch is cut and then sealed.

[0016] According to one embodiment, the information acquisition unit acquires information regarding the weight of the battery cell package into which the electrolyte has been injected and the weight of the battery cell after the process has been completed from the battery cell assembly system, and the controller can calculate the amount of electrolyte discharged based on the weight of the battery cell package into which the electrolyte has been injected, the weight of the battery cell after the process has been completed, and the weight of the pouch cut during the battery cell manufacturing process.

[0017] According to one embodiment, when the remaining amount of electrolyte in the battery cell is less than a first threshold or exceeds a second threshold, the controller provides the battery cell assembly system with remaining amount of electrolyte data of the battery cell, and the battery cell assembly system can modify at least one of the manufacturing processes of the battery cell based on the remaining amount of electrolyte data of the battery cell.

[0018] A battery cell status management method according to one embodiment includes the steps of acquiring information regarding the amount of electrolyte injected into the battery cell, and calculating the remaining amount of electrolyte in the battery cell based on the amount of electrolyte discharged from the battery cell and the amount of electrolyte injected into the battery cell during at least one of the manufacturing processes for the battery cell.

[0019] According to one embodiment, the step of calculating the remaining amount of electrolyte in the battery cell may include the steps of acquiring information on the weight of the battery cell package into which the electrolyte has been injected and the weight of the battery cell after the process has been completed; calculating the amount of discharged electrolyte based on the weight of the battery cell package into which the electrolyte has been injected, the weight of the battery cell after the process has been completed, and the weight of the pouch cut during the manufacturing process of the battery cell; and determining the remaining amount of electrolyte in the battery cell as a value obtained by subtracting the amount of discharged electrolyte from the amount of injected electrolyte.

[0020] According to one embodiment, the step of calculating the electrolyte discharge amount may include a step of calculating a weight of the cut pouch based on at least one of a length of a scrap of the cut pouch, a total length, a number of layers, and a weight of the pouch per unit area.

[0021] According to one embodiment, the method may further include a step of providing remaining electrolyte amount data of the battery cell to at least one of a user and a battery cell assembly system when the remaining electrolyte amount of the battery cell is less than a first threshold value or exceeds a second threshold value.

[0022] A computer program stored on a computer-readable recording medium for performing a battery cell state management method according to an embodiment may be provided. [Effects of the Invention]

[0023] According to one embodiment of the battery cell status management system, data necessary for calculating the remaining amount of electrolyte is collected in conjunction with a battery cell assembly system that performs the manufacturing process, and the remaining amount of electrolyte remaining inside a battery cell after the process has been completed can be accurately calculated based on the collected data.

[0024] According to one embodiment, the weight of the pouch cut in the subsequent process can be automatically calculated as a constant, and the amount of electrolyte discharged calculated based on this can be reflected in the calculation of the remaining amount, thereby making it possible to calculate the remaining amount of electrolyte more accurately than existing methods that could not reflect the amount of electrolyte discharged during the folding process.

[0025] In this way, the remaining amount of electrolyte inside the battery cell can be accurately calculated, and safety problems that may occur when the electrolyte falls below a lower limit or exceeds an upper limit can be prevented. In addition, this document may provide a variety of other benefits that may be perceived directly or indirectly.

[0026] In order to more clearly describe the embodiments disclosed in this document or the technical solutions of the prior art, drawings necessary for describing the embodiments are briefly introduced below. It should be understood that the following drawings are only for describing the embodiments of the present specification and are not intended to limit the same. In addition, for the sake of clarity, the representation of some components in the drawings may be exaggerated or omitted. [Brief explanation of the drawings]

[0027] [Figure 1] 1 shows the configuration of a battery cell manufacturing system including a battery cell state management system according to one embodiment. [Figure 2] 1 shows the configuration of a battery cell package with electrolyte injected into the pouch. [Figure 3] This shows the battery cell package configuration with a portion of the pouch cut off and some of the electrolyte expelled during the degassing process. [Figure 4]This shows the structure of the battery cell package in a state where a portion of the pouch has been cut and some of the electrolyte has been expelled due to the folding process. [Figure 5] 1 is a flowchart illustrating a battery cell state management method according to an embodiment. [Figure 6] 10 is a flowchart showing in detail steps for calculating the remaining amount of electrolyte in a battery cell according to an embodiment. [Figure 7] 10A and 10B are diagrams for explaining a process for calculating the remaining amount of electrolyte in a battery cell according to an embodiment. [Figure 8] 10 is a flowchart illustrating a battery cell state management method according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, the embodiments disclosed herein will be described in detail with reference to the accompanying drawings. When assigning reference numerals to components in each drawing, it should be noted that the same reference numerals are assigned to the same components in other drawings whenever possible. Furthermore, when describing the embodiments disclosed herein, if a detailed description of related known structures or functions is deemed to hinder understanding of the embodiments disclosed herein, such detailed description will be omitted.

[0029] The terms used in this document have been selected as widely used and general as possible while taking into consideration their functions, but these may vary depending on the intentions or practices of engineers in the relevant field or the emergence of new technologies. In addition, in certain cases, the applicant has arbitrarily selected terms, and in such cases, the meanings thereof will be described in the explanation section of the specification. Therefore, it is made clear that the terms used in this document should be interpreted based on the substantive meanings of the terms and the overall content of this document, rather than simply on the names of the terms.

[0030] FIG. 1 shows the configuration of a battery cell manufacturing system including a battery cell state management system according to one embodiment. 1, a battery cell manufacturing system 10 according to an embodiment may include a battery cell assembly system 110 for performing a battery cell manufacturing process, and a battery cell status management system 120 for calculating the amount of electrolyte remaining inside the battery cell based on data received from the battery cell assembly system 110. Although not shown, the battery cell manufacturing system 10 according to the embodiment may further include other process systems that are essential or optional for manufacturing the battery cell.

[0031] The battery cell assembling system 110 may perform a packaging process in which an electrode assembly is attached to a pouch and an electrolyte is injected into the pouch, an activation process in which the battery that has gone through the packaging process is activated by charging and discharging, a degassing process in which gas is discharged from the battery cell, and a folding process in which part of the pouch is cut and then sealed, and may be configured with devices for performing each process.

[0032] The electrode assembly may be manufactured through a notching process for forming positive and negative electrode tabs for the battery, a stacking process for laminating battery materials, and a tab welding process for joining the positive and negative electrode tabs. The packaging process may specifically include a process for packaging the electrode assembly in a pouch, injecting an electrolyte into the pouch, and a vacuum sealing process for primarily sealing the pouch.

[0033] The electrode assembly is manufactured through an electrode manufacturing process performed before the assembly process. It consists of one or more positive electrode sheets, each having a positive electrode active material formed on a positive electrode current collector, and one or more negative electrode sheets, each having a negative electrode active material formed on a negative electrode current collector, stacked alternately. The positive electrode sheets and negative electrode sheets face each other with a separator sheet interposed therebetween. The pouch is an exterior material that contains the electrode assembly and electrolyte and determines the shape of the battery cell. The pouch may be made of a multi-layered packaging plastic laminate film, for example, having a thickness of 70 to 160 micrometers and a molding depth of 4.5 to 8.0 micrometers. In one embodiment, the pouch may be in the form of an aluminum laminate film with a five-layer structure of "outer layer film-adhesive-aluminum foil-adhesive-inner layer film." The structure of the electrode assembly, the number and configuration of the pouches, etc., can be modified depending on the purpose and application and are not limited to the above.

[0034] FIG. 2 illustrates the configuration of a battery cell package with an electrolyte solution injected into the pouch. Referring to FIG. 2, in an assembly process performed by a battery cell assembly system 110, an electrode assembly 20 is packaged in a pouch 200, and an electrolyte solution 30 is injected into the pouch 200. The electrolyte solution 30 may be, for example, but is not limited to, a 1M LiPF6 carbonate-based electrolyte solution. While FIG. 2 illustrates the electrolyte solution 30 as being divided into three components 31, 32, and 33, as will be described later, some of the electrolyte solutions 32 and 33 will be discharged to the outside of the battery cell during a subsequent process, and some of the electrolyte solution 31 will remain inside the battery cell after the process is completed. An objective of one embodiment is to accurately calculate the amount of electrolyte solution 31 remaining inside a battery cell after the process is completed.

[0035] In the activation process, the battery is activated by repeatedly charging and discharging the battery cells assembled through the packaging process. If overcharging occurs during the activation process, gas may be generated inside the pouch, which may cause battery failure. Therefore, a degassing process is performed to remove the gas generated inside the pouch due to overcharging. Unlike cylindrical or prismatic batteries, which have extra space inside the battery cells that can be occupied by gas, pouch-type batteries require a degassing process to remove unwanted gas from inside the pouch.

[0036] FIG. 3 shows the structure of a battery cell package in which a portion of the pouch (gas bag) has been cut and some of the electrolyte has been expelled during the degassing process. During the degassing process, a portion of the pouch 210 is cut away, and some of the electrolyte 33 may also be expelled to the outside of the cell (manufacturers typically overfill the electrolyte during the packaging process, taking into account the electrolyte that will be expelled during the degassing process). The electrolyte may be expelled through the gas exhaust hole or may remain in the cut portion of the pouch. After the degassing process, the battery cell package consists of the electrode assembly 20 and electrolytes 31 and 32 enclosed in the pouch 200'.

[0037] The folding process is a process of sealing a battery cell by folding the outer edge of the pouch, leaving only a necessary portion open. For example, double-side folding can be used to seal a battery cell by cutting the edge of the pouch, folding it twice, and then heat-pressing it. During this process, some electrolyte may be discharged outside the pouch. For example, some electrolyte may remain in the pouch that was cut during the folding process.

[0038] 4 shows the configuration of a battery cell package in a state where a portion of the pouch has been cut and some of the electrolyte has been expelled during the folding process. As shown in the figure, some of the electrolyte 32 remaining after the degassing process may be expelled along with the pouch 220 that has been cut during the folding process. After the degassing and folding processes are completed, the battery cell consists of the electrode assembly 20 and the electrolyte 31 enclosed in the pouch 200''.

[0039] 1 , the battery cell state management system 120 is configured to calculate the remaining amount 31 of electrolyte remaining in the battery cell based on data D1 collected from the battery cell assembly system 110. According to one embodiment, remaining electrolyte amount data D2 of each battery cell can be provided to a user (via a terminal, a server, an internal interface, etc.) or provided to the battery cell assembly system 110 for correction or modification of the manufacturing process.

[0040] The battery cell status management system 120 can include an information acquisition unit 121 that acquires information necessary for calculating the remaining amount of electrolyte in the battery cell from the battery cell assembly system 110, and a controller 122 that calculates the remaining amount of electrolyte in the battery cell based on the information.

[0041] The information acquisition unit 121 acquires information such as the amount of electrolyte injected into the battery cell, the weight of the package immediately after the electrolyte is injected, and the weight of the battery cell after the process is completed from an external system, and the controller 122 calculates the remaining amount of electrolyte based on the amount of electrolyte discharged from the battery cell and the amount of electrolyte injected during at least one of the battery cell manufacturing processes.

[0042] Hereinafter, a process of calculating the remaining amount of electrolyte in a battery cell by a battery cell state management method according to an embodiment will be described with reference to the drawings. FIG. 5 is a flowchart showing a battery cell state management method according to one embodiment.

[0043] First, a step (S510) is performed to acquire information regarding the amount of electrolyte injected into the battery cell (e.g., information regarding the amount of electrolyte injected into the battery cell, the weight of the package immediately after the electrolyte is injected, the weight of the battery cell after the process is completed, etc.). The step (S510) can be performed by an information acquisition unit 121 included in the battery cell state management system 120.

[0044] The electrolyte injection amount information may be obtained by measuring the flow rate of the electrolyte passing through the connection point between the injector and the pouch, or by directly using electrolyte injection amount data pre-registered in the system. The weight of the package into which the electrolyte has been injected may be obtained by measuring the weight of the package during the electrolyte injection process (or at any time before performing a subsequent process).

[0045] Also, in step S510, information regarding the weight of the battery cell for which the process has been completed (also referred to as the "EOL (end of life) weight") can be acquired. The battery cell for which the process has been completed is a battery cell for which the manufacturing processes (assembly process, packaging process, aging process, activation process, degassing process, folding process, etc.) by the battery cell assembly system 110 have been completed, and as shown in FIG. 4, is composed of an electrode assembly 20 surrounded by a pouch 200'' and a remaining electrolyte 31. The weight information of the battery cell may be received directly from the battery cell assembly system 110 or may be received from another subsequent process system that can measure the weight of the battery cell.

[0046] Next, a step (S520) of calculating the remaining amount of electrolyte in the battery cell is performed based on the discharge amount of electrolyte and the injected amount of electrolyte in the battery cell in at least one of the manufacturing processes of the battery cell.

[0047] FIG. 6 is a flowchart showing in detail the step (S520) of calculating the remaining amount of electrolyte in the battery cell. Referring to FIG. 6, the following steps may be sequentially executed: a step (S521) of acquiring information about the weight of the battery cell package into which the electrolyte has been injected and the weight of the battery cell after the process has been completed; a step (S522) of calculating the amount of discharged electrolyte based on the weight of the battery cell package into which the electrolyte has been injected, the weight of the battery cell after the process has been completed, and the weight of the pouch cut in the battery cell manufacturing process; and a step (S523) of determining the remaining amount of electrolyte in the battery cell as the value obtained by subtracting the amount of discharged electrolyte from the amount of injected electrolyte.

[0048] The step (S521) can be performed by the information acquisition unit 121, and can be performed simultaneously with or after the step (S510) of acquiring information about the amount of electrolyte injection.

[0049] According to one embodiment, the step of calculating the electrolyte discharge amount (S522) may include a step of calculating the weight of the cut pouch based on at least one of information on the length of the scrap of the cut pouch, the total length, the number of layers, and the weight of the pouch per unit area.

[0050] To calculate the amount of electrolyte remaining after the final process, weight information of the pouches cut during the degassing / folding process is required, but it is difficult to individually measure the weight of the pouches (gas bags) cut for each battery cell during the battery cell manufacturing process.

[0051] According to the proposed embodiment, the information related to the pouch (total length (mm), number of layers, weight of the pouch per unit area (g / mm)) is pre-entered. 2 )) and the length (mm) of the pouch scraps, the weight of the cut pouches can be automatically calculated. According to a further embodiment, for ease of calculation, the weight of the cut pouches can be constant and applied to the calculation of the remaining amount of electrolyte, for example, the average value of the weights of three or more pouches that have already been calculated can be used.

[0052] 7 is a diagram for explaining a process for calculating the remaining amount of electrolyte in a battery cell according to one embodiment. The amount of electrolyte discharged during the manufacturing process can be calculated as follows.

[0053]

number

[0054] where E d is the amount of electrolyte discharged, W pkg is the weight of the package into which the electrolyte is injected during the packaging process, W eol is the weight of the battery cell at the end of life, W pouch means the weight of the pouch cut off in the subsequent steps (vacuum step, folding step, etc.).

[0055] Finally, in step S523, the remaining amount of electrolyte in the battery cell can be determined by subtracting the amount of discharged electrolyte from the amount of injected electrolyte. That is, the remaining amount of electrolyte can be calculated using the following mathematical formula:

[0056]

number

[0057] where E r is the amount of electrolyte remaining in the battery cell, E i means the amount of electrolyte injected during the packaging process.

[0058] According to the above-described embodiments, the remaining amount of electrolyte remaining in a battery cell after the final process can be calculated relatively accurately. Unlike existing logic, data can be collected and the remaining amount of electrolyte calculated in conjunction with a manufacturing system that performs the manufacturing process. By incorporating the amount of electrolyte discharged during a folding process (e.g., a DSF process), the error between the calculated remaining amount of electrolyte and the actual remaining amount can be reduced. Furthermore, operation is easy because the weight of the cut pouches based on the length of the pouch scraps can be automatically calculated using pre-entered information. Battery cell defects can be easily detected based on the accurately calculated remaining amount of electrolyte.

[0059] Fig. 8 is a flowchart showing a battery cell state management method according to another embodiment. The steps (S810 to S820) of the embodiment in Fig. 8 are similar to the steps (S510 to S520) of the embodiment described with reference to Fig. 5, and therefore redundant description will be omitted.

[0060] Referring to FIG. 8, if the remaining amount of electrolyte in the battery cell is less than the first threshold or exceeds the second threshold, a step (S830) of providing remaining amount of electrolyte data of the battery cell to a user and / or the battery cell assembly system is further performed.

[0061] As shown in FIG. 1, when the remaining amount of electrolyte calculated by the battery cell state management system 120 is below a lower limit or exceeds an upper limit, the remaining amount of electrolyte data D2 of the corresponding battery cell is transmitted to a user (meaning a user terminal, an external server, an internal output interface, etc.) and / or the battery cell assembly system 110.

[0062] According to one embodiment, the first threshold and / or the second threshold may be determined based on remaining electrolyte amount data of the battery cell and two or more other battery cells. The remaining electrolyte amount data of the other battery cells may be stored in a storage device located inside or outside the battery cell status management system 120, and the system 120 may compare the remaining electrolyte amount of the battery cell with the remaining electrolyte amounts of the other battery cells stored in the storage device (or with upper / lower thresholds determined based thereon). Thereafter, remaining electrolyte amount data D2 of the battery cell may be newly stored in the storage device.

[0063] The user can determine whether the battery cell is defective based on the remaining electrolyte amount data D2, and if defects are found repeatedly around the time of manufacturing the battery cell, the user can determine that an unexpected abnormality has occurred in the manufacturing process and correct the problem. Alternatively, an internal diagnostic system of the battery cell assembly system 110 can receive the data D2 to find problems in the manufacturing process and correct part of the process.

[0064] The battery cell state management method according to the embodiment may be implemented as an application or as program instructions executable by various computer components and recorded on a computer-readable recording medium, which may include program instructions, data files, data structures, and the like, either singly or in combination.

[0065] Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, etc.

[0066] Examples of program instructions include not only machine language code, such as that produced by a compiler, but also high-level language code that can be executed by a computer using an interpreter, etc. The hardware devices may be configured to operate as one or more software modules to perform processing according to the techniques of the embodiments, and vice versa.

[0067] According to the above-described embodiment, the data required for calculating the remaining amount of electrolyte can be collected in conjunction with a pouch-type battery cell manufacturing system, and the collected data can be used to accurately calculate the remaining amount of electrolyte inside a pouch-type battery cell after the process is completed. Furthermore, by using a constant value for the weight of the pouch cut during the folding process and incorporating the calculated amount of electrolyte discharged from the constant value into the calculation of the remaining amount, the calculation of the remaining amount of electrolyte can be more accurate than existing methods that do not incorporate the amount of electrolyte discharged during the folding process. In this way, the remaining amount of electrolyte inside the battery cell can be accurately calculated, preventing safety issues that may occur when the electrolyte level falls below a minimum value or exceeds an maximum value.

[0068] The above description is merely an illustrative example of the technical ideas disclosed in this document, and various modifications and variations may be made by a person having ordinary skill in the art to which the embodiments disclosed in this document pertain without departing from the essential characteristics of the embodiments disclosed in this document.

[0069] Therefore, the embodiments disclosed in this document are intended to illustrate, not limit, the technical ideas disclosed in this document, and such embodiments do not limit the scope of the technical ideas disclosed in this document. The scope of protection of the technical ideas disclosed in this document should be interpreted according to the claims set forth below, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of rights of this document. [Explanation of symbols]

[0070] 10 Battery cell manufacturing system 20...electrode assembly 30...electrolyte 110 Battery cell assembly system 120 Battery cell status management system 121...Information acquisition department 122 Controller 200, 200', 200'' pouches

Claims

1. an information acquisition unit that acquires information about the amount of electrolyte injected into the battery cell; a controller that calculates a remaining amount of electrolyte in the battery cell based on an amount of electrolyte discharged from the battery cell and an amount of electrolyte injected into the battery cell in at least one of the manufacturing processes of the battery cell; Including, the information acquisition unit acquires information regarding the weight of the battery cell package into which the electrolyte has been injected and the weight of the battery cell after the battery cell manufacturing process has been completed; the controller calculates the amount of electrolyte discharged based on the weight of the battery cell package into which the electrolyte has been injected, the weight of the battery cell after the battery cell manufacturing process has been completed, and the weight of the pouch cut during the battery cell manufacturing process.

2. The manufacturing process of the battery cell includes: a packaging step of attaching the electrode assembly to a pouch and injecting an electrolyte into the pouch; an activation step of activating the battery cell package that has undergone the packaging step; a degassing step for discharging gas from the battery cell package; and The battery cell status management system according to claim 1 , further comprising at least one of a folding process, a cutting process, and a sealing process.

3. 2. The battery cell state management system according to claim 1, wherein the controller calculates the weight of the cut pouch based on at least one of a length of a scrap of the cut pouch, a total length, a number of layers, and a weight of the pouch per unit area.

4. The battery cell state management system according to claim 3 , wherein the controller converts the weight of the cut pouch into a constant value and uses the constant value to calculate the amount of discharged electrolyte.

5. 2. The battery cell status management system according to claim 1, wherein the controller provides a user with data on the remaining amount of electrolyte in the battery cell when the remaining amount of electrolyte in the battery cell is less than a first threshold or exceeds a second threshold.

6. 6. The battery cell state management system according to claim 5, wherein the first threshold value or the second threshold value is determined based on the remaining electrolyte amount data of the battery cell and two or more other battery cells.

7. a battery cell assembly system that performs a battery cell manufacturing process; a battery cell state management system that manages the remaining amount of electrolyte in the battery cells for which the manufacturing process has been completed; Including, The battery cell state management system includes: an information acquisition unit that acquires information about the amount of electrolyte injected into the battery cell from the battery cell assembly system; a controller that calculates the remaining amount of electrolyte in the battery cell based on the amount of electrolyte discharged from the battery cell and the amount of electrolyte injected into the battery cell in at least one of the manufacturing processes of the battery cell; Including, the information acquisition unit acquires, from the battery cell assembly system, information regarding the weight of the battery cell package into which the electrolyte has been injected and the weight of the battery cell after the battery cell manufacturing process has been completed; the controller calculates the amount of electrolyte discharged based on the weight of the battery cell package into which the electrolyte has been injected, the weight of the battery cell after the battery cell manufacturing process has been completed, and the weight of the pouch cut during the battery cell manufacturing process.

8. The battery cell assembly system includes: a packaging step of attaching the electrode assembly to a pouch and injecting an electrolyte into the pouch; an activation step of activating the battery cell package that has undergone the packaging step; a degassing step for discharging gas from the battery cell package; and 10. The battery cell manufacturing system according to claim 7, further comprising a folding process for sealing the pouch after cutting a portion of the pouch.

9. 8. The battery cell manufacturing system of claim 7, wherein the controller calculates the weight of the cut pouch based on at least one of a length of a scrap of the cut pouch, a total length, a number of layers, and a weight of the pouch per unit area.

10. 10. The battery cell manufacturing system according to claim 9, wherein the controller converts the weight of the cut pouch into a constant value and uses the constant value to calculate the amount of discharged electrolyte.

11. 8. The battery cell manufacturing system of claim 7, wherein the controller provides a user with data on the remaining amount of electrolyte in the battery cell when the remaining amount of electrolyte in the battery cell is less than a first threshold or exceeds a second threshold.

12. 12. The battery cell manufacturing system according to claim 11, wherein the first threshold value or the second threshold value is determined based on the remaining electrolyte amount data of the battery cell and two or more other battery cells.

13. the controller provides the remaining amount of electrolyte of the battery cell to the battery cell assembly system when the remaining amount of electrolyte of the battery cell is less than the first threshold or exceeds the second threshold; The battery cell manufacturing system according to claim 11 , wherein the battery cell assembly system modifies at least one of the manufacturing processes of the battery cells based on the remaining amount data of the electrolyte of the battery cells.

14. obtaining information about the amount of electrolyte filled into the battery cell; calculating a remaining amount of electrolyte in the battery cell based on an amount of discharged electrolyte and an amount of injected electrolyte in the battery cell in at least one of the manufacturing processes of the battery cell; Including, The step of calculating the remaining amount of electrolyte in the battery cell includes: acquiring information about the weight of the battery cell package into which the electrolyte has been injected and the weight of the battery cell after the battery cell manufacturing process is completed; calculating the amount of discharged electrolyte based on the weight of the battery cell package into which the electrolyte has been injected, the weight of the battery cell after the battery cell manufacturing process has been completed, and the weight of the pouch cut in the battery cell manufacturing process; determining the remaining amount of electrolyte in the battery cell as a value obtained by subtracting the amount of electrolyte discharged from the amount of electrolyte injected.

15. The manufacturing process of the battery cell includes: a packaging step of attaching the electrode assembly to a pouch and injecting an electrolyte into the pouch; an activation step of activating the battery cell package that has undergone the packaging step; a degassing step for discharging gas from the battery cell package; and 15. The method of claim 14, further comprising at least one of a folding process of cutting a portion of the pouch and then sealing the pouch.

16. 15. The battery cell state management method according to claim 14, wherein the step of calculating the amount of electrolyte discharged includes a step of calculating a weight of the cut pouch based on at least one of a length of a scrap of the cut pouch, a total length, a number of layers, and a weight of the pouch per unit area.

17. 15. The battery cell state management method of claim 14, further comprising the step of providing data on the remaining amount of electrolyte of the battery cell to at least one of a user and a battery cell assembly system when the remaining amount of electrolyte of the battery cell is less than a first threshold or exceeds a second threshold.

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