Capacitance-based quality monitoring and control in battery manufacturing

Abstract

A quality control system in a battery manufacturing process includes two or more capacitance measurement devices to obtain capacitance measurements from two or more intermediate products generated during the battery manufacturing process. The system also includes processing circuitry to obtain the capacitance measurements from the two or more capacitance measurement devices, determine characteristics of the corresponding intermediate products, and control at least one process of the battery manufacturing process used to produce at least one of the two or more intermediate products based on the characteristics.

Description

Technical Field

[0001] This disclosure relates to capacitor-based quality monitoring and control in battery manufacturing. Background Technology

[0002] For example, battery cells are increasingly used in hybrid and autonomous vehicles. Multiple battery cells can be packaged together into one or more modules, and modules can be combined into packs. Any number of battery cells can be stacked in series to obtain a vehicle battery. Battery manufacturing involves several processes involving electrode assembly, battery cell assembly, and formation (i.e., initial charge / discharge operations). Quality problems with intermediate products arising from any of these processes can affect the quality of the resulting battery. Therefore, it is desirable to provide capacitance-based quality monitoring and control in battery manufacturing. Summary of the Invention

[0003] In one exemplary embodiment, the quality control system in the battery manufacturing process includes two or more capacitance measuring devices configured to obtain capacitance measurements from two or more intermediate products generated during the battery manufacturing process. The system also includes processing circuitry for obtaining the capacitance measurement results from the two or more capacitance measuring devices, determining the characteristics of a corresponding intermediate product among the two or more intermediate products, and controlling at least one process of the battery manufacturing process for producing at least one of the two or more intermediate products based on the characteristics.

[0004] In addition to one or more features described herein, one of the two or more capacitance measuring devices includes one or more conductive plates disposed on a first side of the corresponding intermediate product and one or more conductive plates disposed on a second side of the corresponding intermediate product, and further includes a measuring instrument for measuring the capacitance between the one or more conductive plates disposed on the first side of the corresponding intermediate product and the one or more conductive plates disposed on the second side of the corresponding intermediate product.

[0005] In addition to one or more features described herein, the processing circuit also determines the thickness of a portion of the corresponding intermediate product as a characteristic.

[0006] In addition to one or more features described herein, one of the two or more capacitance measuring devices includes two or more conductive plates on a first side of the corresponding intermediate product and one or more conductive plates on a second side of the corresponding intermediate product, and the processing circuit determines the thickness of the wet slurry applied during the electrode coating process to produce the corresponding intermediate product.

[0007] In addition to one or more features described herein, the processing circuitry determines the thickness of a portion of the corresponding intermediate product produced by the roller press, which indicates porosity and density.

[0008] In addition to one or more features described herein, the processing circuitry is based on thickness control of the pressure applied by the roller press.

[0009] In addition to one or more features described herein, the processing circuit determines the dielectric constant of the material in the corresponding intermediate product as the characteristic.

[0010] In addition to one or more features described herein, one of the two or more capacitance measuring devices includes a measuring instrument for measuring the capacitance between the anode and cathode formed for the battery.

[0011] In addition to one or more features described herein, one of the two or more capacitance measuring devices includes a measuring instrument for measuring the capacitance between the anode or cathode formed for the battery and the frame holding the intermediate product.

[0012] In addition to one or more features described herein, one of the two or more capacitance measuring devices includes a measuring instrument for measuring the capacitance between the movable plate and the frame, and the processing circuitry estimates the volume of the released gas based on the capacitance.

[0013] In another exemplary embodiment, a method for assembling a quality control system during battery manufacturing includes arranging two or more capacitance measuring devices to obtain capacitance measurements from two or more intermediate products generated during the battery manufacturing process. The method further includes configuring processing circuitry to obtain the capacitance measurement results from the two or more capacitance measuring devices to determine the characteristics of a corresponding intermediate product among the two or more intermediate products, and controlling at least one process of the battery manufacturing process for producing at least one of the two or more intermediate products based on the characteristics.

[0014] In addition to one or more features described herein, arranging the two or more capacitance measuring devices includes: one of the capacitance measuring devices comprising one or more conductive plates disposed on a first side of a corresponding intermediate product and one or more conductive plates disposed on a second side of a corresponding intermediate product, and further comprising a measuring instrument configured to measure the capacitance between the one or more conductive plates disposed on the first side of the corresponding intermediate product and the one or more conductive plates disposed on the second side of the corresponding intermediate product.

[0015] In addition to one or more features described herein, the configuration processing circuitry includes processing circuitry that determines the thickness of a portion of the corresponding intermediate product as a characteristic.

[0016] In addition to one or more features described herein, arranging two or more capacitance measuring devices includes: one of the capacitance measuring devices includes two or more conductive plates on a first side of the corresponding intermediate product and one or more conductive plates on a second side of the corresponding intermediate product, and configuring processing circuitry includes processing circuitry to determine the thickness of the wet slurry applied during electrode coating to produce the corresponding intermediate product.

[0017] In addition to one or more features described herein, the configuration processing circuitry includes processing circuitry that determines the thickness of a portion of the corresponding intermediate product produced by the roller press, the thickness indicating porosity and density.

[0018] In addition to one or more features described herein, the configuration processing circuitry includes processing circuitry that controls the pressure applied by the roller press based on thickness.

[0019] In addition to one or more features described herein, the configuration processing circuitry includes processing circuitry that determines the dielectric constant of the material in the corresponding intermediate product as a characteristic.

[0020] In addition to one or more features described herein, one of the two or more capacitance measuring devices includes arranging measuring instruments to measure the capacitance between the anode and cathode formed for a battery.

[0021] In addition to one or more features described herein, arranging the two or more capacitance measuring devices includes one of the capacitance measuring devices comprising a measuring instrument for measuring the capacitance between the anode or cathode formed for the battery and the frame holding the intermediate product.

[0022] In addition to one or more features described herein, arranging the two or more capacitance measuring devices includes: one of the two or more capacitance measuring devices includes a measuring instrument for measuring the capacitance between the movable plate and the frame, and configuring the processing circuitry includes: the processing circuitry estimating the volume of the released gas based on the capacitance.

[0023] The above-described features and advantages, as well as other features and advantages of this disclosure, will become apparent when taken in conjunction with the accompanying drawings and the following detailed description. Attached Figure Description

[0024] Other features, advantages, and details appear only by way of example in the following detailed description, with reference to the accompanying drawings, wherein:

[0025] Figure 1 It is a battery manufacturing process including capacitance-based quality monitoring and control according to one or more embodiments;

[0026] Figure 2A Aspects of an exemplary capacitance measurement device for performing capacitance-based monitoring at one or more stages of battery manufacturing, according to one or more embodiments, are shown.

[0027] Figure 2B It shows Figure 2A A top view of the capacitance measuring device shown;

[0028] Figure 2C A top view of another exemplary capacitance measuring device according to one or more embodiments is shown;

[0029] Figure 3 Aspects of an exemplary capacitance measuring device used in the monitoring phase according to one or more embodiments are shown;

[0030] Figure 4 Aspects of an exemplary capacitance measurement device for performing capacitance-based monitoring at one or more stages of battery manufacturing, according to one or more embodiments, are shown.

[0031] Figure 5 Aspects of an exemplary capacitance measurement device for capacitance-based monitoring at one or more stages of battery manufacturing, according to one or more embodiments, are shown.

[0032] Figure 6 Exemplary capacitance measuring devices for capacitance-based monitoring at one or more stages of battery manufacturing, according to one or more embodiments, are illustrated; and

[0033] Figure 7 Exemplary capacitance measurement devices for capacitance-based monitoring at one or more stages of battery manufacturing, according to one or more embodiments, are shown. Detailed Implementation

[0034] The following description is exemplary in nature only and is not intended to limit this disclosure, its application, or use. It should be understood that throughout the drawings, corresponding reference numerals denote the same or corresponding parts and features.

[0035] As previously mentioned, battery manufacturing (e.g., the manufacturing of battery cells for vehicle batteries) involves several processes. Embodiments of the systems and methods detailed herein relate to capacitance-based quality monitoring and control in battery manufacturing. Typically, in a parallel arrangement of conductive plates separated by a dielectric, where the conductive plates have an overlap area A, a spacing d (in meters), and an electrical constant ε0 (approximately 8.854 × 10⁻⁶),... -12 (Faradays / meter), and the dielectric has a dielectric constant k, the capacitance is given by the following formula:

[0036]

[0037] As detailed, capacitance-based monitoring can be implemented on intermediate products produced by processes at different manufacturing stages. According to an exemplary embodiment, a distance d (indicating the thickness of the intermediate product) or a dielectric constant k (indicating the material quality or properties of the intermediate product) can be determined by measuring capacitance. One or more processes can be controlled based on monitoring.

[0038] According to an exemplary embodiment, Figure 1 This is a process flow 100 of an exemplary battery manufacturing process including capacitance-based quality monitoring and control. Monitoring stages according to one or more embodiments are designated S1-S10. Fewer or more monitoring stages S1-S10 may be used, and this can be ensured, for example, through modifications to the battery manufacturing process. A processing circuitry system 190 is also indicated. This processing circuitry 190 may be centralized or distributed within the manufacturing facility and may be integrated with each capacitance measuring device 200 (FIG. 2), 400 (FIG. 400) used at any or all monitoring stages S1-S10. Figure 4 ), 500 Figure 5 ), 600 Figure 6 ), 700 Figure 7 ) Coupling.

[0039] Additionally, as discussed, one or more processes 110-180 may further involve control implemented via processing circuitry system 190 based on monitoring at one of stages S1-S10. Processing circuitry 190 may include application-specific integrated circuits (ASICs), electronic circuitry, processors (shared, dedicated, or grouped) executing one or more software or firmware programs, memory, combinational logic circuitry, and / or other suitable components providing the described functionality. Memory may be in the form of a non-transitory computer-readable medium storing instructions that, when processed by one or more processors, perform aspects of the methods detailed herein.

[0040] The process shown in boxes 110 to 140 involves electrodes (i.e., anode 410 and cathode 420). Figure 4 The formation of )). At frame 110, the process includes coating 230 (wet slurry) Figure 2A)Applied to plate 240 ( Figure 2A (e.g., copper foil, aluminum foil) on. Plate 240 can be referred to as the current collector in the battery cell. After application at frame 110, in monitoring phase S1, capacitance measuring device 200 ( Figure 2A This can be used to measure the capacitance on the obtained intermediate product and to determine the thickness or dielectric constant of the wet slurry coating 230 according to Equation 1, as referenced. Figure 2A Further discussion. At frame 120, the process includes drying the coated plate 240 in an oven. Following the drying process at frame 120, in monitoring stage S2, the capacitance on the resulting intermediate product can be measured using the same or similar capacitance measuring device 200 used in monitoring stage S1, and the dielectric constant and / or thickness of the dried coating 230 can be determined according to Equation 1, also as referenced. Figure 2A Further discussion is needed. The processing at boxes 110 and 120, as well as monitoring stages S1 and S2, can be repeated to coat the other side of plate 240 and provide plate 305. Figure 3 (As an intermediate product)

[0041] At frame 130, the process includes placing the coated plate 220 through a roller press 300. Figure 3 Monitoring stage S3 occurs after the roller press at frame 130. Monitoring stage S3 may involve the same or similar capacitance measuring device 200 as the capacitance measuring device used in monitoring stages S1 and S2. The capacitance of the intermediate product produced by the roller press can be used to determine the thickness, which indicates porosity and density. Processing circuit 190 can use the thickness determination as feedback to control the roller press 300 (e.g., to make roller 310 ( Figure 3 (Moving the rollers closer together) can reduce the thickness of the resulting intermediate product, or the roller press 300 can be controlled (e.g., moving the rollers 310 further away) to increase the thickness. This will refer to... Figure 3 Further discussion.

[0042] At frame 140, cutting, grooving, and vacuum drying are performed to produce the battery electrodes (i.e., anode 410, cathode 420). At monitoring stage S4, the capacitance measuring device 200 can be used in a similar manner to that used at monitoring stage S2 to determine the dielectric constant and thus determine whether the drying process is complete.

[0043] The processes shown in boxes 150 to 170 typically involve assembly. At box 150, the lamination of the anode 410 and cathode 420 is then folded to produce a dry cell stack 430 (i.e., without electrolyte 610). Figure 6 Following this process, in monitoring phase S5, capacitance can be measured to determine whether the overlap area of ​​the anode 410 and cathode 420 in the stack 430 is consistent. This will refer to... Figure 4The capacitance measuring device 400 will be discussed further.

[0044] At frame 160, such as welding, placing stack 430 into bag 510 ( Figure 5 The intermediate product 505 is produced by the process of sealing the three sides of the product. Figure 5 It was tested at monitoring stage S6. It can be used... Figure 5 The capacitance measuring device 500 shown, or the capacitance measuring device 400 that is reused or copied from the monitoring stage S5, is used to determine the characteristics of the intermediate product 505.

[0045] At frame 170, the process includes pouring out electrolyte 610, sealing bag 510, and packaging. Bag 510 can be packaged in frame 520, such as... Figure 5 As shown, the assembly process is completed. Intermediate products generated from assembly can be inspected in monitoring stage S7. Specifically, in monitoring stage S7, capacitance values ​​can be used to monitor the diffusion of electrolyte 610 into stack 430. This monitoring can employ the same or similar capacitance measuring device 500 used in monitoring stage S6.

[0046] At box 180, the process includes formation, which refers to performing initial charge / discharge operations, degassing gases generated as byproducts of the solid electrolyte intermediate phase during the formation process, and performing final end-of-line inspection. As indicated, monitoring stages S8, S9, and S10 may be included within the process at box 180. Specifically, monitoring stage S8 is associated with formation, as referenced... Figure 6 Further discussion reveals that monitoring phase S9 is associated with degassing, as referenced... Figure 7 Further discussion, and the same or similar capacitance measuring device 600 used in monitoring stage S8 may be used in monitoring stage S10.

[0047] Figure 2A , 2B Figures 2C and 2C illustrate aspects of a capacitance measuring device 200 for capacitance-based monitoring at one or more stages of battery manufacturing, according to one or more embodiments. Specifically, the capacitance measuring device 200 can be reused or replicated for use at monitoring stages S1, S2, S3, and S4. Figure 2A This is a side view of the capacitance measuring device 200 according to an exemplary embodiment.

[0048] The capacitance measuring device 200 includes one or more first conductive plates 210, second conductive plates 250, and a capacitance, inductance, and resistance (LCR) measuring instrument 260. In the exemplary illustration, the first conductive plate 210 is smaller than the second conductive plate 250, and both are smaller than plate 240. Figure 2B and2C It shows relative to Figure 2A The top view of the view in the image. For example... Figure 2B As shown, the first conductive plate 210 is rectangular. Figure 2C As shown, the first conductive plate 210 can be formed as a plurality of circular first conductive plates 210. These exemplary embodiments are used to illustrate that the first conductive plate 210 can be of any shape. The number and distribution of the first conductive plates 210 provide spatial resolution for capacitance measurement.

[0049] An exemplary intermediate product 205 is shown as comprising a plate 240 having a coating 230. As indicated, the coating 230 is initially applied as a wet slurry coating 230a at frame 110 and dried at frame 120 to produce a dried coating 230b. Figure 2A The exemplary intermediate product 205 shown is the result of a processing procedure performed once at frames 110 and 120 (i.e., on one side of plate 240). As previously mentioned, the processing at frames 110 and 120 can also be repeated to coat the other side of plate 240, and the result of this repetition can also be monitored using a capacitance measuring device 200. Instead of discrete monitoring phases S1 and S2, the capacitance measuring device 200 can be used to continuously (e.g., periodically) monitor the intermediate product 205 during the drying process of coating 230. This monitoring can continue during coating of the second side of plate 240.

[0050] As shown in the figure, the first conductive plate 210 is held on one side of the intermediate product 205, and the second conductive plate 250 is held on the opposite side of the intermediate product 205. An air gap 220 (i.e., air) separates each conductive plate 210, 250 from the intermediate product 205. The frame holding the conductive plates 210, 250 in place is not shown. The air gap 220 is a different dielectric material from the plates 240 and the coating 230, and their capacitive contributions are known. According to the arrangement shown in Figure 2, the capacitance Ceq measured by the LCR meter 260 is equal to the capacitance of the series-connected air gaps 220 (Cair1 and Cair2) and the capacitance of the intermediate product 205 (Cip), and is obtained by the following formula:

[0051]

[0052] Therefore, since the capacitances of the air gaps 220 (Cair1 and Cair2) are known and the capacitance Ceq is measured by the LCR meter 260, the capacitance (Cip) of the intermediate product 205 can be determined from Equation 2.

[0053] Once the capacitance of the intermediate product is known based on Equation 2, the thickness d or dielectric constant k can be determined using Equation 1 as needed. When the intermediate product is the result of repeating the processes at frames 110 and 120 (i.e., coating plate 305...), Figure 3 The results of the processing at box 130 (in the case of monitoring at monitoring stage S3) (i.e., intermediate product 320) Figure 3 The same applies to the results of the processing at box 140 (in the case of monitoring at monitoring stage S4).

[0054] Figure 3 Aspects of a capacitance measuring device 200 used at monitoring stage S3 (at frame 130) for capacitance-based monitoring during a roll forming process, according to an exemplary embodiment, are shown. The coating plate 305 is produced by applying a coating 230 to both sides of a plate 240 and drying the coating 230 (by performing the processes at frames 110 and 120 twice). At frame 130, a pair of rollers 310 arranged on either side of the coating plate 305 roll on the coating plate 305, as indicated by arrows, to produce an intermediate product 320. The spacing between the rollers 310 defines the thickness of the intermediate product 320, as shown... Figure 3 As shown.

[0055] like Figure 3 As shown, the capacitance measuring device 200 is arranged to measure the thickness of the intermediate product 320 produced by the rolling process. Conductive plates 210, 250 are held on either side of the intermediate product 320, with an air gap 220 between each conductive plate 210, 250 and the corresponding side of the intermediate product 320. As previously stated, the capacitance measured by the LCR measuring instrument 260 is equal to the known capacitance of the air gap 220 and the capacitance of the intermediate product 320 connected in series. Therefore, the capacitance of the intermediate product 320 can be determined using Equation 2, and the thickness of the intermediate product 320 can be determined using Equation 1.

[0056] like Figure 3 As shown, processing circuit 190 is coupled to LCR measuring instrument 260. Processing circuit 190 can determine the thickness of intermediate product 320 based on Equations 1 and 2. Additionally, processing circuit 190 can provide control signal S as needed to adjust the spacing between rollers 310, which defines the thickness. That is, capacitance measuring device 200 can facilitate feedback control to ensure the correct thickness of intermediate product 320, which ultimately forms anode 410 and cathode 420.

[0057] Figure 4Aspects of a capacitance measuring device 400 for capacitance-based monitoring at one or more stages of battery manufacturing, according to one or more embodiments, are shown. Specifically, the capacitance measuring device 400 can be reused or replicated for use at monitoring stages S5 and S6. A stack 430 produced by the process at box 150 is shown. The stack 430 includes alternately arranged anodes 410 and cathodes 420, as shown. Each anode 410 and cathode 420 is separated by a separator 415. As shown, the anodes 410 together serve as a first conductive plate 210, and the cathodes 420 together serve as a second conductive plate 250. As previously mentioned, the capacitance measured by the LCR meter 260 will be affected by the overlap area of ​​the anodes 410 and cathodes 420.

[0058] Therefore, the capacitance measured by the LCR meter 260 of the capacitance measuring device 400 can be used for feedback on the processing at frame 150. For example, the measured capacitance can be compared to a range of expected or acceptable capacitance values. This acceptable capacitance or range can be based on the proper stacking of the anode 410 and cathode 430 (e.g., appropriate size and arrangement to obtain an appropriate overlap area). For example, a measured capacitance falling outside the acceptable capacitance or range can be used to change the fold at frame 150. As another example, a measured capacitance falling outside the acceptable capacitance or range can be used to identify batteries with defects such as broken connectors or contacts.

[0059] Figure 5 Aspects of a capacitance measuring device 500 for capacitance-based monitoring at one or more stages of battery manufacturing, according to one or more embodiments, are shown. Specifically, the capacitance measuring device 500 can be reused or replicated for use at monitoring stages S6 and S7. An intermediate product 505 produced by the processing at frame 160 is shown. According to this processing, a stack 430 is placed in a bag 510 and may be additionally packaged in a frame 520. At monitoring stage S6, three sides of the intermediate product 505 are sealed. (See reference...) Figure 4 As noted, a capacitance measuring device 400, which uses the anode 410 as the first conductive plate 210 and the cathode 420 as the second conductive plate 250, can be used alternately at monitoring stage S6. At monitoring stage S7, following the processing at frame 170, the electrolyte 610 has been poured into a bag, and the fourth side is sealed.

[0060] like Figure 5As shown, the anodes 410 of stack 430 are clamped together as a first conductive plate 210, while frame 520 is used as a second conductive plate 250 of capacitance measuring device 500. In an alternative embodiment, cathode 420 may alternatively be used as the first conductive plate 210. For example, monitoring phase S6 can ensure that the processing at frame 160 does not change the capacitance measured at monitoring phase S5. Electrolyte 610 is added at frame 170 ( Figure 6 Subsequently, at monitoring stage S7, capacitance measurement using capacitance measurement device 500 can be used to monitor the diffusion of electrolyte 610 into the layers of anode 410 and cathode 420.

[0061] For example, the monitoring may include comparing the measured capacitance with an expected capacitance range. Typically, after the introduction of electrolyte 610, formation is not initiated (at box 180) for a period of time (e.g., hours, days) to ensure that electrolyte 610 has diffused. Based on monitoring phase S7, the capacitance measurement indicating that formation (at box 180) is ready to begin can be used as an indication of exactly when formation can begin, thereby saving time and associated costs.

[0062] Figure 6 Aspects of a capacitance measuring device 600 for capacitance-based monitoring at one or more stages of battery manufacturing, according to one or more embodiments, are shown. Specifically, the capacitance measuring device 600 can be reused or replicated for use at monitoring stages S8 and S10. Figure 6 Intermediate product 620 generated during the formation process at box 180 is shown. As previously described, electrolyte 610 is poured into bag 510 as part of the process at box 170. The formation process (at box 180) then involves charging the battery (i.e., driving current through intermediate product 620).

[0063] As shown in the figure, the intermediate product 620 is held in the test fixture 630. Anodes 410 are clamped together and serve as the first conductive plate 210, and cathodes 420 are clamped together and serve as the second conductive plate 250. The capacitance measured by the LCR meter 260 of the capacitance measuring device 600, when compared with an expected value by the processing circuit 190, indicates the state of the processing (e.g., how much electrolyte 610 is being used). When the same or a similar capacitance measuring device 600 is used in the monitoring phase S10, the capacitance of the completed battery is measured and compared with an expected value to determine the battery quality.

[0064] Figure 7Aspects of a capacitance measuring device 700 for capacitance-based monitoring at one or more stages of battery manufacturing, according to one or more embodiments, are shown. Specifically, the capacitance measuring device 700 may be used at monitoring stage S9 corresponding to the degassing process at block 180. Degassing refers to the release of gases generated during a formation process, which is also part of the process at block 180. The capacitance measuring device 700 is used to infer the volume of the generated gases.

[0065] As shown in the figure, the intermediate product 705 obtained at the end of the formation process is held in the fixture 720. The capacitance measuring device 700 uses the fixture 720 as the first conductive plate 210 and uses a movable plate 710 as the second conductive plate 250. Figure 7 In the arrangement shown, as more gas is generated, the movable plate 710 moves upward. As the movable plate 710 moves upward, the distance between the conductive plates 210 and 250 decreases, thereby reducing the air gap AG and affecting the capacitance measured by the LCR meter 260. Therefore, the increase in gas volume as the distance decreases can be inferred from the measured capacitance. That is, the dielectric constant k of the air in the air gap AG is known, and the distance d can be solved using Equation 1. The gas volume, more specifically, compared to the expected volume, can be used to identify problems (e.g., a gas volume below the expected value or range indicates that nothing is happening, or a gas volume exceeding the expected value or range indicates a possible problem).

[0066] While the foregoing disclosure has been described with reference to exemplary embodiments, those skilled in the art will understand that various changes can be made and elements can be substituted with equivalents without departing from its scope. Furthermore, many modifications can be made to adapt particular situations or materials to the teachings of this disclosure without departing from the basic scope of this disclosure. Therefore, this disclosure is not intended to be limited to the specific embodiments disclosed, but will include all embodiments falling within its scope.

Claims

1. A quality control system for battery manufacturing process, the system comprising: Two or more capacitance measuring devices are configured to obtain capacitance measurement results from two or more intermediate products generated during the battery manufacturing process; as well as A processing circuit configured to obtain capacitance measurement results from the two or more capacitance measuring devices, determine the characteristics of a corresponding intermediate product among the two or more intermediate products, and control at least one process of the battery manufacturing process for producing at least one of the two or more intermediate products based on the characteristics. Wherein, one of the two or more capacitance measuring devices includes a measuring instrument configured to measure the capacitance between the movable plate and the frame, and the processing circuit is configured to estimate the volume of the released gas based on the capacitance.

2. The system according to claim 1, wherein, One of the two or more capacitance measuring devices includes one or more conductive plates disposed on a first side of the corresponding intermediate product and one or more conductive plates disposed on a second side of the corresponding intermediate product, and further includes a measuring instrument configured to measure the capacitance between the one or more conductive plates disposed on the first side of the corresponding intermediate product and the one or more conductive plates disposed on the second side.

3. The system according to claim 2, wherein, The processing circuit is configured to determine the thickness of a portion of the corresponding intermediate product as the characteristic; one of the two or more capacitance measuring devices includes two or more conductive plates on the first side of the corresponding intermediate product and one or more conductive plates on the second side of the corresponding intermediate product, and the processing circuit is configured to determine the thickness of the wet slurry applied during electrode coating to produce the corresponding intermediate product; and the processing circuit is configured to determine the thickness of the portion of the corresponding intermediate product produced by the roller press, the thickness indicating porosity and density; Furthermore, the processing circuit is configured to control the pressure applied by the roller press based on the thickness.

4. The system according to claim 2, wherein, The processing circuit is configured to determine the dielectric constant of the material in the corresponding intermediate product as the characteristic, and one of the two or more capacitance measuring devices includes a measuring instrument configured to measure the capacitance between the anode and cathode formed by the battery.

5. A method for assembling a quality control system during battery manufacturing, the method comprising: Two or more capacitance measuring devices are arranged to obtain capacitance measurement results from two or more intermediate products generated during the battery manufacturing process; as well as The processing circuitry is configured to obtain the capacitance measurement results from the two or more capacitance measuring devices to determine the characteristics of a corresponding intermediate product among the two or more intermediate products, and to control at least one process of the battery manufacturing process for producing at least one of the two or more intermediate products based on the characteristics. The arrangement of the two or more capacitance measuring devices includes: one of the two or more capacitance measuring devices includes a measuring instrument for measuring the capacitance between the movable plate and the frame, and the configuration processing circuit includes a processing circuit for estimating the volume of released gas based on the capacitance.

6. The method according to claim 5, wherein, Arranging the two or more capacitance measuring devices includes: one of the capacitance measuring devices includes one or more conductive plates arranged on a first side of the corresponding intermediate product and one or more conductive plates arranged on a second side of the corresponding intermediate product, and further includes a measuring instrument configured to measure the capacitance between the one or more conductive plates arranged on the first side of the corresponding intermediate product and the one or more conductive plates arranged on the second side of the corresponding intermediate product.

7. The method according to claim 6, wherein, The processing circuit is configured to determine the thickness of a portion of the corresponding intermediate product as the characteristic. The arrangement of the two or more capacitance measuring devices includes: one of the capacitance measuring devices includes two or more conductive plates on the first side of the corresponding intermediate product and one or more conductive plates on the second side of the corresponding intermediate product; and the processing circuit is configured to determine the thickness of the wet slurry applied during electrode coating to produce the corresponding intermediate product; and the processing circuit is configured to determine the thickness of a portion of the corresponding intermediate product produced by the roller press, the thickness indicating porosity and density; Furthermore, the processing circuit controls the pressure applied by the roller press based on the thickness.

8. The method according to claim 6, wherein, The configuration of the processing circuit includes determining the dielectric constant of the material in the corresponding intermediate product as the characteristic; and the arrangement of one of the two or more capacitance measuring devices includes arranging a measuring instrument to measure the capacitance between the anode and cathode formed for the battery.

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