Method and device for detecting pole piece

Abstract

The application provides a detection method and a detection device for an electrode sheet. The detection method comprises the following steps: placing a to-be-detected electrode sheet and a detection liquid into a reaction chamber so that the to-be-detected electrode sheet and the detection liquid are in contact; and detecting the to-be-detected electrode sheet according to a color change of the detection liquid in the reaction chamber. The detection method and the detection device for the electrode sheet can quickly and accurately detect the to-be-detected electrode sheet according to the color change of the detection liquid, can save detection time, and can greatly reduce detection cost.

Description

Technical Field

[0001] This application relates to the field of testing, and more specifically, to a method and apparatus for testing electrodes. Background Technology

[0002] Sodium-ion batteries, as an emerging energy storage technology, have shown broad application prospects in large-scale energy storage systems, electric vehicles, and portable electronic devices due to their advantages such as abundant resources, low cost, and environmental friendliness.

[0003] During the charging and discharging process of sodium-ion batteries, as battery polarization gradually increases, some sodium ions fail to embed into the negative electrode and instead precipitate as metallic elemental sodium on the surface of the negative electrode, a phenomenon known as sodium deposition. The accumulation of sodium metal on the electrode surface increases battery polarization. In severe cases, the sodium metal can puncture the separator, causing a short circuit and creating a safety hazard. In extreme cases, it can even lead to major safety accidents such as battery short circuits and explosions. Therefore, detecting sodium deposition defects in sodium-ion battery cells is essential for the safe use of sodium-ion batteries.

[0004] Since the surface of the negative electrode in a sodium-ion battery is black under all states of charge (SOC), it is difficult to distinguish with the naked eye even if sodium deposition occurs. Therefore, equipment such as scanning electron microscopes and inductively coupled plasma atomic emission spectrometers can usually be used to determine whether sodium has been deposited on the surface of the negative electrode. However, this method is time-consuming, costly, and requires a lot of manpower and resources. Summary of the Invention

[0005] This application provides a method and apparatus for detecting electrodes, which can quickly and accurately detect electrodes.

[0006] In a first aspect, a method for detecting an electrode is provided, the method comprising: placing the electrode to be tested and a detection liquid into a reaction chamber to bring the electrode to be tested and the detection liquid into contact; and detecting the electrode to be tested based on the color change of the detection liquid in the reaction chamber.

[0007] The electrode detection method provided in this application embodiment can quickly and accurately detect the electrode to be tested based on the color change of the detection liquid, which can save detection time and greatly reduce detection costs.

[0008] In one possible implementation, the electrode to be tested includes the negative electrode of a sodium-ion battery, the detection liquid includes an alkaline indicator, and the step of detecting the electrode to be tested based on the color change of the detection liquid in the reaction chamber includes: determining that the electrode to be tested has precipitated sodium when the color of the detection liquid changes; or determining that the electrode to be tested has not precipitated sodium when the color of the detection liquid does not change.

[0009] The electrode detection method provided in this application can quickly and accurately determine whether sodium has been deposited on the negative electrode of a sodium-ion battery based on whether the color of the detection liquid changes, thus saving detection time and greatly reducing detection costs.

[0010] In one possible implementation, the detection solution includes phenolphthalein reagent, and determining sodium precipitation of the electrode to be tested when the color of the detection solution changes includes determining sodium precipitation of the electrode to be tested when the color of the detection solution turns red.

[0011] The electrode detection method provided in this application allows for the identification of sodium precipitation in the electrode by the fact that phenolphthalein reagent changes color significantly from colorless to red upon contact with the electrode containing precipitated sodium. This facilitates the observation of color changes in the detection solution, leading to accurate judgment of sodium precipitation in the electrode and improving the accuracy of electrode detection.

[0012] In one possible implementation, the detection solution includes phenolphthalein reagent, and determining that the electrode to be tested has not precipitated sodium when the color of the detection solution does not change includes determining that the electrode to be tested has not precipitated sodium when the color of the detection solution does not turn red.

[0013] The electrode detection method provided in this application allows for rapid and accurate determination of sodium non-deposition on the electrode when phenolphthalein reagent encounters the negative electrode of a sodium-ion battery that has not precipitated sodium, since the color of the detection solution does not change.

[0014] In one possible implementation, determining sodium deposition on the electrode under test when the color of the detection liquid turns red includes: determining sodium deposition on the surface of the electrode under test that is in contact with the target area when the color of the target area of ​​the detection liquid turns red.

[0015] The electrode detection method provided in this application can quickly and accurately determine the location of sodium precipitation on the electrode to be tested based on the target area where the detection liquid turns red, which facilitates subsequent analysis and detection, such as facilitating the investigation of the cause of sodium precipitation.

[0016] In one possible implementation, the volume of the detection liquid is 10 ml to 150 ml.

[0017] In one possible implementation, the volume of the detection liquid is 10 ml to 50 ml.

[0018] The electrode detection method provided in this application, by controlling the volume of the detection liquid within a reasonable range, ensures complete contact between the electrode and the detection liquid to allow for a reaction, thereby facilitating the determination of whether sodium precipitation occurs on the entire electrode and enabling accurate detection of sodium precipitation. Furthermore, it reduces the amount of detection liquid used, thus lowering costs.

[0019] In one possible implementation, the shape of the electrode to be tested includes a rectangle or a square, the first side length of the electrode to be tested is in the range of 30mm to 350mm, the second side length of the electrode to be tested is in the range of 60mm to 250mm, and the first side length and the second side length are perpendicular.

[0020] In one possible implementation, the first side length ranges from 50mm to 250mm, and the second side length ranges from 100mm to 200mm.

[0021] The electrode detection method provided in this application controls the length and width of the electrode to be tested within a reasonable range. On the one hand, it can reasonably and accurately reflect the sodium precipitation status of the electrodes on the production line by observing the sodium precipitation of the electrodes within this size range. On the other hand, controlling the size of the electrode to be tested within a certain range can reduce the amount of electrode used during testing, thereby reducing production costs. For example, if the electrode assembly after the electrode to be tested is cut still has electrode size within the production requirements and no sodium precipitation is detected, the electrode assembly can still be processed to the next process, reducing excessive waste of electrode assemblies and lowering production costs.

[0022] In one possible implementation, before adding the electrode to be tested and the detection solution into the reaction chamber, the method further includes: extracting a target electrode assembly from the produced electrode assembly at a ratio of 1% to 10%; and cutting the electrode to be tested from the target electrode assembly.

[0023] In one possible implementation, extracting a target electrode assembly from the produced electrode assembly at a ratio of 1% to 10% includes: extracting the target electrode assembly from the produced electrode assembly at a ratio of 1% to 5%.

[0024] The electrode detection method provided in this application embodiment can extract target electrode components from the produced electrode components according to a certain proportion for detection. It can accurately reflect the sodium precipitation of electrode components produced on the production line to a certain extent, thereby improving detection efficiency and reducing detection costs.

[0025] Secondly, an electrode detection device is provided, the detection device comprising: a dispensing port for dispensing the electrode to be tested and the detection liquid into a reaction chamber; the reaction chamber for containing the electrode to be tested and the detection liquid so that the electrode to be tested comes into contact with the detection liquid, the dispensing port being disposed on the reaction chamber; and an observation window for observing the color change of the detection liquid to detect the electrode to be tested.

[0026] The electrode detection device provided in this application embodiment can quickly and accurately detect the electrode to be tested based on the color change of the detection liquid, which can save detection time and greatly reduce detection costs.

[0027] In one possible implementation, the detection device further includes a detection liquid discharge port, which is located at the lower end of the side wall or the bottom wall of the reaction chamber, and is used to discharge the detection liquid after detection.

[0028] The electrode detection device provided in this application embodiment facilitates the discharge of the detection liquid after detection by setting a detection liquid discharge port on the reaction chamber.

[0029] In one possible implementation, the dispensing port is also used to remove the tested electrode from the reaction chamber after testing.

[0030] The electrode detection device provided in this application embodiment can both put the detection liquid and the electrode to be tested into the reaction chamber through the inlet, and can also take out the tested electrode through the inlet. The detection device with a relatively simple structure can put the electrode and the detection liquid into the reaction chamber and take out the tested electrode from the reaction chamber.

[0031] In one possible implementation, the dispensing port is located on the top wall of the reaction chamber.

[0032] The electrode detection device provided in this application embodiment facilitates the addition of detection liquid and the electrode to be tested into the reaction chamber by setting an inlet on the top wall of the reaction chamber.

[0033] In one possible implementation, the detection device further includes a housing having an opening, and the reaction chamber being configured to enter and exit the housing through the opening.

[0034] The electrode detection device provided in this application embodiment is further provided with a housing. The reaction chamber after the detection liquid and the electrode to be tested are added can be placed in the housing. The housing can protect the reaction chamber and reduce the influence of external factors on the detection, such as reducing the chance of the reaction chamber being hit and reducing the possibility of impurities falling into the reaction chamber.

[0035] In one possible implementation, the opening is provided on the first sidewall of the housing, and the reaction chamber is configured to enter and exit the housing through the opening along a target direction perpendicular to the inner and outer surfaces of the first sidewall.

[0036] The electrode detection device provided in this application embodiment facilitates the entry and exit of the reaction chamber from the side of the housing by providing an opening in the first side wall of the housing, thus facilitating the operation of the reaction chamber entering and exiting the housing.

[0037] In one possible implementation, a handle is provided on the first outer side wall of the reaction chamber, the handle being configured to push or pull the reaction chamber in and out of the housing via the opening along the target direction, the first outer side wall being configured to close the opening when the reaction chamber is placed in the housing.

[0038] The electrode detection device provided in this application embodiment has a handle on the first outer side wall of the reaction chamber, which makes it easy for a person to hold the handle and push or pull the reaction chamber in and out of the housing through the opening along the target direction, thus facilitating operation.

[0039] On the other hand, when the reaction chamber is placed in the housing, the first outer side wall closes the opening, which enables the housing and the reaction chamber to form a relatively sealed space together, preventing external impurities from falling into the reaction chamber and affecting the electrode detection, thus improving the accuracy of the detection.

[0040] In one possible implementation, the inner wall of the housing and the outer wall of the reaction chamber are provided with corresponding sliding mechanisms, and the reaction chamber is configured to slide in and out of the housing via the sliding mechanisms.

[0041] The electrode detection device provided in this application embodiment, by setting corresponding sliding mechanisms on the inner wall of the housing and the outer wall of the reaction chamber, can, on the one hand, support the reaction chamber through the sliding mechanism, and on the other hand, make it easier for the reaction chamber to move in and out of the housing.

[0042] In one possible implementation, the observation window is disposed within the housing.

[0043] The electrode detection device provided in this application embodiment facilitates the observation of color changes in the detection liquid within the reaction chamber by setting an observation window on the housing.

[0044] In one possible implementation, the observation window is disposed on the first sidewall and located above the opening.

[0045] The electrode detection device provided in this application embodiment has an observation window above the opening in the first sidewall, which facilitates clear observation of the color change of the detection liquid in the reaction chamber, thereby facilitating accurate detection of the electrode.

[0046] In one possible implementation, the detection device further includes a placement mechanism disposed within the reaction chamber. The placement mechanism is used to place the electrode to be tested, and the surface of the electrode to be tested can be observed through the observation window when the reaction chamber is placed in the housing.

[0047] The electrode detection device provided in this application embodiment utilizes a placement mechanism to orient the detection surface of the electrode to be tested toward the observation window, facilitating the observation of the color change of the detection liquid in contact with the detection surface of the electrode to be tested, thereby enabling the detection of the electrode to be tested.

[0048] In one possible implementation, the detection device further includes a detection liquid discharge channel, one end of which is connected to the detection liquid discharge port, and the other end of which extends outside the housing.

[0049] The electrode detection device provided in this application embodiment facilitates the discharge of the detection liquid from the reaction chamber to the outside of the housing by setting a detection liquid discharge channel.

[0050] In one possible implementation, the electrode to be tested includes the negative electrode of a sodium-ion battery, the detection liquid includes an alkaline indicator, and the observation window is used to observe whether the color of the detection liquid changes in order to determine whether sodium is deposited on the electrode to be tested.

[0051] The electrode detection device provided in this application embodiment can quickly and accurately determine whether sodium has been deposited on the negative electrode of a sodium-ion battery based on whether the color of the detection liquid has changed, which can save detection time and greatly reduce detection costs.

[0052] In one possible implementation, the detection solution includes phenolphthalein reagent, and the observation window is used to observe whether the color of the detection solution turns red in order to determine whether the electrode to be tested has precipitated sodium.

[0053] The electrode detection device provided in this application allows for the determination of sodium precipitation in the electrode by observing whether the phenolphthalein reagent turns red upon contact with an electrode where sodium has precipitated. This color change is clearly visible through the observation window, thus accurately determining whether sodium has precipitated in the electrode and improving the accuracy of electrode detection.

[0054] In some embodiments, the observation window is used to observe the target area where the detection liquid turns red, in order to determine the surface sodium deposition on the electrode under test that is in contact with the target area.

[0055] In this embodiment, the target area where the liquid turns red can be detected through the observation window, thereby quickly and accurately determining the location of sodium precipitation on the electrode to be tested, which facilitates subsequent analysis and detection, such as facilitating the investigation of the cause of sodium precipitation.

[0056] In one possible implementation, the volume of the detection liquid is 10 ml to 150 ml.

[0057] In one possible implementation, the volume of the detection liquid is 10 ml to 50 ml.

[0058] The electrode detection device provided in this application, by controlling the volume of the detection liquid in the reaction chamber within a reasonable range, ensures complete contact between the electrode to be tested and the detection liquid to allow for a reaction. This facilitates the determination of whether sodium precipitation occurs on the entire electrode to be tested, thereby enabling accurate detection of sodium precipitation. Furthermore, it reduces reagent waste and lowers costs.

[0059] In addition, if the volume of the detection liquid is within a certain range, the volume of the reaction chamber can be set within a certain range, reducing the space occupancy rate of the reaction chamber.

[0060] In one possible implementation, the shape of the electrode to be tested includes a rectangle or a square, the first side length of the electrode to be tested is in the range of 30mm to 350mm, the second side length of the electrode to be tested is in the range of 60mm to 250mm, and the first side length and the second side length are perpendicular.

[0061] In one possible implementation, the first side length ranges from 50mm to 250mm, and the second side length ranges from 100mm to 200mm.

[0062] The electrode detection device provided in this application controls the length and width of the electrode to be tested within a reasonable range. On the one hand, it can reasonably and accurately determine the sodium precipitation status of the electrode on the production line based on the sodium precipitation status of the electrode within this size range. On the other hand, controlling the size of the electrode to be tested within a certain range can reduce electrode waste and lower production costs. For example, if the electrode assembly after the electrode to be tested is cut still has electrode size within the production requirements and no sodium precipitation is detected, the electrode assembly can still be processed to the next process, reducing excessive waste of electrode assemblies and lowering production costs.

[0063] In addition, if the size of the electrode to be tested is within a certain range, the volume of the reaction chamber can be set within a certain range to reduce the space occupancy rate of the reaction chamber.

[0064] In one possible implementation, the electrode to be tested is cut from a target electrode assembly, which is extracted from the produced electrode assemblies at a ratio of 1% to 10%.

[0065] In one possible implementation, the target electrode assembly is extracted from the produced electrode assembly at a ratio of 1% to 5%.

[0066] The electrode detection device provided in this application embodiment can extract target electrode components from the produced electrode components according to a certain proportion for detection. It can accurately reflect the sodium precipitation of the electrode components produced on the production line to a certain extent, thereby improving detection efficiency and reducing detection costs. Attached Figure Description

[0067] Figure 1 This is a schematic flowchart of the electrode detection method provided in the embodiments of this application.

[0068] Figure 2 This is a schematic flowchart of the electrode detection method provided in the embodiments of this application.

[0069] Figure 3 This is a schematic flowchart of the electrode detection method provided in the embodiments of this application.

[0070] Figure 4 This is a schematic flowchart of the electrode detection method provided in the embodiments of this application.

[0071] Figure 5 This is a schematic block diagram of the electrode detection device provided in the embodiments of this application.

[0072] Figure 6 This is another schematic block diagram of the electrode detection device provided in the embodiments of this application.

[0073] Figure label:

[0074] 5000: Electrode detection device; 5100: Inlet; 5200: Reaction chamber; 5210: First outer side wall; 5300: Observation window; 5400: Detection liquid outlet; 5500: Housing; 5510: First side wall; 5511: Opening; 5600: Handle; 5700: Sliding mechanism; 5800: Storage mechanism; 5900: Detection liquid discharge channel. Detailed Implementation

[0075] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0076] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings of this application, are intended to cover non-exclusive inclusion.

[0077] The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " in this text generally indicates that the preceding and following related objects have an "or" relationship.

[0078] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0079] In this application, the terms "upper," "lower," "left," "right," "inner," and "outer," indicating orientation or positional relationships, are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0080] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0081] Sodium-ion batteries, as an emerging energy storage technology, have shown broad application prospects in large-scale energy storage systems, electric vehicles, and portable electronic devices due to their advantages such as abundant resources, low cost, and environmental friendliness.

[0082] Typically, a sodium-ion battery cell includes a positive electrode, a separator, a negative electrode, and an electrolyte. During charging and discharging, active ions move back and forth between the positive and negative electrodes, inserting and extracting. The electrolyte acts as a conductor between the positive and negative electrodes, while the separator, positioned between them, primarily prevents short circuits while allowing ions to pass through.

[0083] During the charging and discharging process of sodium-ion batteries, as battery polarization gradually increases, some sodium ions fail to embed into the negative electrode and instead precipitate as metallic elemental sodium on the surface of the negative electrode, a phenomenon known as sodium deposition. The accumulation of sodium metal on the electrode surface increases battery polarization. In severe cases, the sodium metal can puncture the separator, causing a short circuit and creating a safety hazard. In extreme cases, it can even lead to major safety accidents such as battery short circuits and explosions. Therefore, detecting sodium deposition defects in sodium-ion battery cells is essential for the safe use of sodium-ion batteries.

[0084] Since the surface of the negative electrode of a sodium-ion battery is black at all states of charge (SOC), it is difficult to distinguish with the naked eye even if sodium deposition occurs. Therefore, it is usually possible to determine whether sodium has been deposited on the surface of the negative electrode using equipment such as scanning electron microscopes and inductively coupled plasma atomic emission spectrometers. However, this method is time-consuming, costly, and requires a lot of manpower and resources.

[0085] To address the aforementioned issues, this application provides a method and apparatus for detecting electrode sheets. The method includes: placing the electrode sheet to be tested and a detection liquid into a reaction chamber; and detecting the electrode sheet to be tested based on the color change of the detection liquid in the reaction chamber.

[0086] The electrode detection method and detection device provided in this application can quickly and accurately detect the electrode under test based on the color change of the detection liquid, which can save detection time and greatly reduce detection costs.

[0087] The following combination Figures 1 to 4 The electrode detection method provided in the embodiments of this application will be described by way of example.

[0088] Figure 1 This is a schematic flowchart of the electrode detection method provided in the embodiments of this application.

[0089] 110. Place the electrode to be tested and the detection solution into the reaction chamber to bring them into contact.

[0090] As an example, the electrode to be tested can be placed in the reaction chamber first, and then the detection solution can be poured into the reaction chamber. Alternatively, the detection solution can be poured into the reaction chamber first, and then the electrode to be tested can be placed into the reaction chamber.

[0091] In this embodiment, the reaction chamber is a container that holds the electrode to be tested and the detection liquid so that the electrode to be tested and the detection liquid come into contact in the container to be able to react.

[0092] 120. The electrode to be tested is tested based on the color change of the test solution in the reaction chamber.

[0093] The electrode to be tested and the detection solution are placed in the reaction chamber, and the electrode to be tested and the detection solution come into contact. Then, the electrode to be tested is tested based on the color change of the detection solution after the two come into contact.

[0094] In the embodiments of this application, the electrode to be tested can be quickly and accurately detected based on the color change of the detection liquid, which can save detection time and greatly reduce detection costs.

[0095] In some embodiments, the electrode to be tested includes the negative electrode of a sodium-ion battery, and the detection solution includes an alkaline indicator. Whether sodium has been deposited on the electrode can be determined by whether the color of the detection solution changes in the reaction chamber. The following is in conjunction with... Figure 2 A further illustrative description is provided of a detection method for determining whether sodium has been deposited on the electrode under test based on whether the color of the detection solution in the reaction chamber changes.

[0096] Figure 2 This is a schematic flowchart of the electrode detection method provided in the embodiments of this application.

[0097] 210. Place the electrode to be tested and the detection solution into the reaction chamber to bring the electrode to be tested and the detection solution into contact.

[0098] The description of placing the electrode to be tested and the detection solution into the reaction chamber in step 210 can be found in the relevant content of step 110, and will not be repeated here.

[0099] In some embodiments, the electrode to be tested includes the negative electrode of a sodium-ion battery.

[0100] For the negative electrode of a sodium-ion battery, the pH value at which sodium is deposited is typically around 9, indicating alkalinity. When sodium encounters an alkaline indicator, the indicator's color changes. Therefore, the color change of the indicator can be used to determine whether sodium has been deposited on the electrode under test.

[0101] In this embodiment, an alkali indicator is an indicator that changes color when it comes into contact with an alkali. As examples, alkali indicators may include litmus reagent, phenolphthalein reagent, methyl orange reagent, etc.

[0102] 220a, when the color of the test solution changes, sodium precipitation on the electrode to be tested is determined.

[0103] 220b, if the color of the test solution does not change, it is determined that no sodium has been precipitated on the electrode to be tested.

[0104] As an example, the test solution can be litmus reagent, which turns blue in the presence of alkali. If the test solution turns blue, it indicates that sodium has been precipitated on the electrode being tested; if the test solution does not change color (i.e., remains purple), it indicates that no sodium has been precipitated on the electrode being tested.

[0105] In the embodiments of this application, it is possible to quickly and accurately determine whether sodium has been deposited on the negative electrode of a sodium-ion battery based on whether the color of the detection liquid changes, which can save detection time and greatly reduce detection costs.

[0106] In some embodiments, the detection solution includes phenolphthalein reagent.

[0107] Phenolphthalein is a colorless reagent. Its color usually remains unchanged when it encounters acids or neutral substances; however, it turns red when it encounters alkalis. Therefore, phenolphthalein remains colorless when it encounters electrodes with or without precipitated sodium; however, when it encounters electrodes with precipitated sodium, its color changes to red, and the color change is quite noticeable.

[0108] The following combination Figure 3 Taking the electrode to be tested as the negative electrode of a sodium-ion battery and the detection solution as phenolphthalein reagent as an example, the detection method of the electrode provided in the embodiments of this application will be further illustrated.

[0109] Figure 3 This is a schematic flowchart of the electrode detection method provided in the embodiments of this application.

[0110] 310. Place the electrode to be tested and the detection solution into the reaction chamber to bring the electrode to be tested and the detection solution into contact.

[0111] In some embodiments, the electrode to be tested includes the negative electrode of a sodium-ion battery.

[0112] In some embodiments, the detection solution includes phenolphthalein reagent.

[0113] The description of step 310 can be found in step 110 and the relevant content above, and will not be repeated here.

[0114] 320a, when the color of the test solution turns red, it is determined that sodium is precipitated on the electrode to be tested.

[0115] As shown above, phenolphthalein reagent exhibits a very noticeable color change when it comes into contact with an electrode where sodium has precipitated, turning it red. Therefore, if the test solution turns red, it can be assumed that sodium has precipitated on the electrode being tested.

[0116] In this embodiment, since the phenolphthalein reagent changes color significantly from colorless to red when it encounters an electrode with precipitated sodium, the presence of sodium precipitation on the electrode can be confirmed when the phenolphthalein reagent turns red. This facilitates the observation of the color change of the detection solution, thereby enabling accurate judgment of sodium precipitation on the electrode and improving the accuracy of electrode detection.

[0117] In some embodiments, if the target area of ​​the detection liquid turns red, it is determined that sodium deposition exists on the surface of the electrode in contact with the target area.

[0118] When testing electrodes, it may be observed that some areas of the test solution turn red while other areas remain largely unchanged. This is because sodium is deposited in the portion of the electrode in contact with this red area, while there is virtually no sodium deposited in the portion of the electrode in contact with other areas. This causes the test solution to turn red in some areas.

[0119] In this case, the location of sodium deposition on the electrode to be tested can be determined based on the area where the test solution turns red.

[0120] In the embodiments of this application, the location of sodium deposition on the electrode to be tested can be quickly and accurately determined based on the target area where the detection liquid turns red, which facilitates subsequent analysis and detection, such as facilitating the investigation of the cause of sodium deposition.

[0121] 320b: If the color of the test solution does not turn red, it is determined that no sodium has been precipitated on the electrode to be tested.

[0122] As shown above, phenolphthalein reagent does not change color when it comes into contact with the negative electrode of a sodium-ion battery that has not precipitated sodium. Therefore, it is possible to quickly and accurately determine that no sodium has precipitated on the electrode being tested, even when the color of the test solution does not change.

[0123] In some embodiments, the volume of the detection solution is 10 ml to 150 ml.

[0124] As an example, the volume of phenolphthalein reagent is 80 ml.

[0125] In some embodiments, the volume of the detection solution is 10 ml to 50 ml.

[0126] As an example, the volume of phenolphthalein reagent is 40 ml.

[0127] In this embodiment, by controlling the volume of the detection liquid within a reasonable range, it is possible to ensure complete contact between the electrode under test and the detection liquid to allow for a reaction. This facilitates the determination of whether sodium deposition occurs on the entire electrode under test, thereby enabling accurate detection of sodium deposition. Furthermore, it can reduce the amount of detection liquid used to some extent, thus lowering costs.

[0128] As an example, the concentration of phenolphthalein reagent is usually 0.5%. That is, take 0.5g of phenolphthalein, dissolve it in 95% ethanol, and dilute it to 100mL without adding water.

[0129] In some embodiments, the shape of the electrode to be tested includes a rectangle or a square, the first side length of the electrode to be tested ranges from 30mm to 350mm, the second side length of the electrode to be tested ranges from 60mm to 250mm, and the first side length and the second side length are perpendicular.

[0130] In some embodiments, the first side length ranges from 50mm to 250mm, and the second side length ranges from 100mm to 200mm.

[0131] As an example, a wound electrode assembly includes corner regions on both sides and a straight region located between the corner regions. For a wound electrode assembly, the straight region of its outermost negative electrode can be used as the electrode to be tested. Alternatively, a negative electrode with one straight region and one corner region can be used as the electrode to be tested.

[0132] As an example, the length of the electrode to be tested is 100mm and the width of the electrode to be tested is 50mm.

[0133] In this embodiment, the length and width of the electrode to be tested are controlled within a reasonable range. On the one hand, the sodium deposition status of the electrodes within this size range can reasonably and accurately reflect the sodium deposition status of the electrodes on the production line. On the other hand, controlling the size of the electrode to be tested within a certain range can reduce the amount of electrode used for testing, thereby reducing production costs. For example, if the electrode assembly after the electrode to be tested is cut still has electrode size within the production requirements and no sodium deposition is detected, the electrode assembly can still be processed to the next process, reducing excessive waste of electrode assemblies and lowering production costs.

[0134] Figure 4 This is a schematic flowchart of the electrode detection method provided in the embodiments of this application.

[0135] 410. Extract the target electrode assembly from the produced electrode assembly at a ratio of 1% to 10%.

[0136] Electrode assemblies typically include positive electrode plates, negative electrode plates, and separators.

[0137] For example, when producing 100 electrode assemblies, 1 to 10 electrode assemblies can be randomly selected as target electrode assemblies.

[0138] In some embodiments, target electrode assemblies are extracted from the produced electrode assemblies at a ratio of 1% to 5%.

[0139] For example, when producing 100 electrode components, one electrode component can be randomly selected as the target electrode component.

[0140] 420. Cut the electrode to be tested from the negative electrode of the target electrode assembly.

[0141] As an example, if the electrode assembly after the electrode sheet to be tested is still within the size range of the production requirements, and no sodium is precipitated after the electrode sheet is tested, the electrode assembly can continue to the next process.

[0142] In the embodiments of this application, target electrode components can be extracted from the produced electrode components at a certain ratio for testing. This can accurately reflect the sodium precipitation of the electrode components produced on the production line to a certain extent, thereby improving testing efficiency and reducing testing costs.

[0143] 430. Place the electrode to be tested and the detection solution into the reaction chamber to bring them into contact.

[0144] 440. The electrode to be tested is tested based on the color change of the test solution in the reaction chamber.

[0145] The descriptions of steps 430 and 440 can be found in the relevant content above, and will not be repeated here.

[0146] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0147] The detection method of the battery system according to the embodiments of this application has been described in detail above. The following will be combined with... Figure 5 and Figure 6 The electrode detection apparatus of the present application is described in detail below. The technical features described in the above method embodiments are applicable to the following apparatus embodiments.

[0148] like Figure 5 or Figure 6 As shown, the detection device 5000 includes an inlet 5100, a reaction chamber 5200, and an observation window 5300.

[0149] The inlet 5100 is used to introduce the electrode to be tested and the detection solution into the reaction chamber 5200.

[0150] The reaction chamber 5200 is used to contain the electrode to be tested and the detection liquid so that the electrode to be tested and the detection liquid come into contact. The inlet 5100 is located on the reaction chamber 5200.

[0151] The observation window 5300 is used to observe the color change of the test liquid for testing the electrode under test.

[0152] The electrode to be tested and the detection solution are introduced into the reaction chamber 5200 through the inlet 5100. In the reaction chamber 5200, the electrode to be tested and the detection solution come into contact to allow a reaction to occur. The color change of the detection solution in the reaction chamber 5200 is observed through the observation window 5300 to detect the electrode to be tested.

[0153] As an example, the electrode to be tested can be placed in reaction chamber 5200 first, and then the detection solution can be poured into reaction chamber 5200. Alternatively, the detection solution can be poured into reaction chamber 5200 first, and then the electrode to be tested can be placed in reaction chamber 5200.

[0154] The electrode detection device 5000 provided in this application embodiment can quickly and accurately detect the electrode to be tested based on the color change of the detection liquid, which can save detection time and greatly reduce detection costs.

[0155] In some embodiments, the detection device 5000 further includes a detection liquid discharge port 5400, which is disposed at the lower end of the side wall of the reaction chamber 5200 and is used to discharge the detection liquid after detection.

[0156] In some embodiments, the detection liquid discharge port 5400 may be located on the bottom wall of the reaction chamber 5200 (this arrangement is not shown in the figure).

[0157] As an example, the reaction chamber 5200 includes four side walls and a bottom wall, and a test liquid discharge port 5400 can be provided at the lower end of any one of its side walls or the bottom wall for discharging the test liquid after testing.

[0158] In this embodiment of the application, a detection liquid discharge port 5400 is provided at the lower end of the side wall or the bottom wall of the reaction chamber 5200 to facilitate the discharge of the detection liquid after detection.

[0159] In some embodiments, the inlet 5100 is also used to remove the tested electrode from the reaction chamber 5200.

[0160] As an example, after the test is completed, the electrode in the reaction chamber 5200 can be removed through the inlet 5100.

[0161] In this embodiment of the application, the detection liquid and the electrode to be tested can be put into the reaction chamber 5200 through the inlet 5100, and the electrode after testing can also be taken out through the inlet 5100. The detection device 5000, which has a relatively simple structure, can put the electrode and the detection liquid into the reaction chamber 5200 and take out the electrode after testing from the reaction chamber 5200.

[0162] In some embodiments, the inlet 5100 may be located on the reaction chamber 5200.

[0163] As an example, the inlet 5100 is located on the top wall of the reaction chamber 5200.

[0164] For example, the reaction chamber 5200 can be a cube or a cuboid, and the top of the cube or cuboid is provided with an opening, such as the entire top opening, which serves as the delivery port 5100 of the detection device 5000.

[0165] In this embodiment of the application, by providing a dispensing port 5100 on the top wall of the reaction chamber 5200, it is convenient to dispense the detection liquid and the electrode to be tested into the reaction chamber 5200.

[0166] In some embodiments, the detection device 5000 further includes a housing 5500 having an opening 5511, and a reaction chamber 5200 configured to enter and exit the housing 5500 through the opening 5511.

[0167] As an example, after the detection liquid and the electrode to be tested are placed in the reaction chamber 5200, the reaction chamber 5200 can be placed in the housing 5500 through the opening 5511, and then the electrode to be tested is performed in the housing 5500.

[0168] As an example, after the test is completed, the test liquid in the reaction chamber 5200 can be discharged out of the reaction chamber through the test liquid discharge port 5400, and then the reaction chamber 5200 can be taken out of the housing through the opening 5511, and the tested electrode can be taken out through the inlet 5100.

[0169] In this embodiment of the application, the detection device 5000 is further provided with a housing 5500. The reaction chamber 5200 after the detection liquid and the electrode to be tested are added can be placed in the housing 5500. The housing 5500 can protect the reaction chamber 5200 and reduce the influence of external factors on the detection, such as reducing the chance of the reaction chamber 5200 being hit and reducing the possibility of impurities falling into the reaction chamber 5200.

[0170] In some embodiments, the first sidewall 5510 of the housing 5500 is provided with an opening 5511, and the reaction chamber 5200 is configured to enter and exit the housing 5500 through the opening 5511 in a target direction, the target direction being perpendicular to the inner and outer surfaces of the first sidewall 5510.

[0171] As an example, the housing 5500 can typically be a regular cube or cuboid shape, with an opening 5511 provided on the first side wall 5510 of the housing 5500, allowing the reaction chamber 5200 to enter and exit the housing 5500 along a direction perpendicular to the inner and outer surfaces of the first side wall 5510.

[0172] As an example, the first sidewall 5510 can be any one of the sidewalls of the housing 5500.

[0173] In this embodiment of the application, by providing an opening 5511 in the first side wall 5510 of the housing 5500, the reaction chamber 5200 can enter and exit the housing 5500 from the side of the housing 5500, which facilitates the operation of the reaction chamber 5200 entering and exiting the housing 5500.

[0174] In some embodiments, the first outer side wall 5210 of the reaction chamber 5200 is provided with a handle 5600, which is configured to push and pull the reaction chamber 5200 in and out of the housing 5500 via the opening 5511 along a target direction, and the first outer side wall 5210 is configured to close the opening 5511 when the reaction chamber 5200 is placed in the housing 5500.

[0175] The first outer sidewall 5210 of the reaction chamber 5200 can be understood as the outer surface of the first sidewall of the reaction chamber 5200.

[0176] When the reaction chamber 5200 is placed in the housing 5500, the first outer side wall 5210 and the first side wall 5510 of the housing 5500 are located on the same side of the housing 5500.

[0177] The handle 5600 can push and pull the reaction chamber 5200 in a direction perpendicular to the first outer side wall 5210. For example, the reaction chamber 5200 can be pulled out of the housing 5500 using the handle 5600, and the detection liquid and the electrode to be tested can be added into the reaction chamber 5200 through the inlet 5100. Then, the reaction chamber 5200 can be pushed into the housing 5500 using the handle 5600, so that the first outer side wall 5210 of the reaction chamber 5200 closes the opening 5511 of the housing 5500, so that the electrode can be tested in the housing 5500.

[0178] In this embodiment, a handle is provided on the first outer side wall 5210 of the reaction chamber 5200, which facilitates manual operation by holding the handle 5600 and pushing and pulling the reaction chamber 5200 through the opening 5511 into and out of the housing 5500 in the target direction.

[0179] On the other hand, when the reaction chamber 5200 is placed in the housing 5500, the first outer side wall 5210 closes the opening 5511, which enables the housing 5500 and the reaction chamber 5200 to form a relatively sealed space together, preventing external impurities from falling into the reaction chamber 5200 and affecting the electrode detection, thereby improving the accuracy of the detection.

[0180] In some embodiments, the inner wall of the housing 5500 and the outer wall of the reaction chamber 5200 are provided with corresponding sliding mechanisms 5700, and the reaction chamber 5200 is configured to slide in and out of the housing 5500 via the sliding mechanisms 5700.

[0181] As an example, the inner wall of the housing 5500 includes the inner sidewall of the housing 5500, and the outer wall of the reaction chamber 5200 includes the outer sidewall of the reaction chamber 5200. Alternatively, the inner wall of the housing 5500 includes the inner bottom wall of the housing 5500, and the outer wall of the reaction chamber 5200 includes the outer bottom wall of the reaction chamber 5200.

[0182] For example, the inner wall of the shell 5500 and the outer wall of the reaction chamber 5200 are provided with corresponding slide rail mechanisms, such as drawer slide rails.

[0183] In this embodiment of the application, by providing corresponding sliding mechanisms 5700 on the inner wall of the housing 5500 and the outer wall of the reaction chamber 5200, on the one hand, the sliding mechanisms 5700 can support the reaction chamber 5200, and on the other hand, the sliding mechanisms 5700 can make it easier for the reaction chamber 5200 to move in and out of the housing 5500.

[0184] In some embodiments, the observation window 5300 may be located on the reaction chamber 5200.

[0185] That is, the detection device 5000 may include a delivery port 5100, a reaction chamber 5200 and an observation window 5300, wherein the delivery port 5100 and the observation window 5300 are both located on the reaction chamber 5200.

[0186] As an example, the injection port can be located on the top wall of the reaction chamber 5200, and the observation window 5300 can be located on the side wall of the reaction chamber 5200. For example, the side wall of the reaction chamber 5200 can be made of a transparent material to serve as the observation window 5300.

[0187] As another example, the top wall of the reaction chamber 5200 can be completely opened, serving as both the delivery port 5100 and the observation window 5300.

[0188] In some embodiments, the observation window 5300 may be disposed in the housing 5500.

[0189] As an example, an opening can be provided on the housing 5500 as an observation window 5300. Alternatively, an opening can be provided on the housing 5500 and a transparent material can be provided at the opening as an observation window 5300.

[0190] In this embodiment of the application, by setting an observation window 5300 on the housing 5500, it is convenient to observe the color change of the detection liquid in the reaction chamber 5200.

[0191] In some embodiments, the observation window 5300 is disposed on the first sidewall 5510 and located above the opening 5511.

[0192] As an example, a transparent area can be provided above the opening 5511 of the first sidewall 5510 as an observation window 5300. The top opening of the reaction chamber 5200 can also serve as a dispensing port 5100, or the entire top opening can serve as a dispensing port 5100. Therefore, the color change of the detection liquid inside the reaction chamber 5200 can be observed through the observation window 5300 and the dispensing port 5100.

[0193] In this embodiment of the application, an observation window 5300 is provided above the opening 5511 of the first sidewall 5510 to facilitate clear observation of the color change of the detection liquid in the reaction chamber 5200, thereby facilitating accurate detection of the electrode.

[0194] In some embodiments, the observation window 5300 may also be located on the second sidewall where the first sidewall intersects.

[0195] In some embodiments, the sidewall of the reaction chamber 5200 on the same side as the observation window 5300 may be made of a transparent material.

[0196] In some embodiments, the detection device 5000 further includes a placement mechanism 5800 disposed within the reaction chamber 5200. The placement mechanism 5800 is used to place the electrode to be tested, and when the reaction chamber 5200 is placed in the housing 5500, the surface to be tested of the electrode to be tested can be observed through the observation window 5300.

[0197] As an example, the placement mechanism 5800 can be a clamping mechanism. The clamping structure can be located at the upper and lower ends of the reaction chamber 5200 or at opposite ends of the side of the reaction chamber 5200. Each clamping mechanism can clamp the opposite surface of the electrode under test along the thickness direction, so that the test surface of the electrode under test can be observed through the observation window 5300. For example, the test surface of the electrode under test can be facing upwards, or the test surface of the electrode under test can be at a certain angle, such as 45°, to the horizontal plane.

[0198] Generally speaking, the test surface of the electrode under test is the surface containing the length and width of the electrode under test. The test surface of the electrode under test is perpendicular to the thickness direction of the electrode under test.

[0199] The electrode under test is relatively thin and small in size. When placed in the reaction chamber 5200 containing the detection liquid, it is difficult for the test surface of the electrode to face the observation window 5300. Therefore, a placement mechanism 5800 is needed to fix the electrode under test.

[0200] In this embodiment of the application, by using the placement mechanism 5800, the detection surface of the electrode to be tested can be oriented toward the observation window 5300, so as to facilitate the observation of the color change of the detection liquid in contact with the detection surface of the electrode to be tested, in order to test the electrode to be tested.

[0201] In some embodiments, the detection device 5000 further includes a detection liquid discharge channel 5900, one end of which is connected to a detection liquid discharge port 5400, and the other end of which extends outside the housing 5500.

[0202] After testing, the test solution is discharged from the reaction chamber 5200 through the test solution discharge port 5400 and the test solution discharge channel 5900.

[0203] In this embodiment, by providing a detection liquid discharge channel 5900, the detection liquid after detection is discharged from the reaction chamber 5200 to the outside of the housing 5500.

[0204] In some embodiments, the electrode to be tested includes the negative electrode of a sodium-ion battery, the detection liquid includes an alkaline indicator, and the observation window 5300 is used to observe whether the color of the detection liquid changes in order to determine whether sodium is deposited on the electrode to be tested.

[0205] For the negative electrode of a sodium-ion battery, the pH value at which sodium is deposited is typically around 9, indicating alkalinity. When sodium encounters an alkaline indicator, the indicator's color changes. Therefore, the color change of the indicator can be used to determine whether sodium has been deposited on the electrode under test.

[0206] In this embodiment, an alkali indicator refers to an indicator that changes color when it encounters an alkali. As examples, alkali indicators may include litmus reagent, phenolphthalein reagent, methyl orange reagent, etc.

[0207] For example, the test solution can be litmus reagent, which turns blue in the presence of alkali. If the test solution turns blue, it indicates that sodium has been precipitated on the electrode being tested; if the test solution does not change color (i.e., remains purple), it indicates that no sodium has been precipitated on the electrode being tested.

[0208] The electrode detection device provided in this application embodiment can quickly and accurately determine whether sodium has been deposited on the negative electrode of a sodium-ion battery based on whether the color of the detection liquid has changed, which can save detection time and greatly reduce detection costs.

[0209] In some embodiments, the detection solution includes phenolphthalein reagent, and the observation window 5300 is used to observe whether the color of the detection solution turns red in order to determine whether sodium is precipitated on the electrode to be tested.

[0210] Phenolphthalein is a colorless reagent. Its color usually remains unchanged in the presence of acids or neutral substances; however, it turns red in the presence of alkalis. Therefore, phenolphthalein remains colorless when it comes into contact with electrodes with or without sodium precipitation; however, when it comes into contact with electrodes with precipitated sodium, the color changes to red, and the color change is quite noticeable. Therefore, if the test solution turns red, it can be assumed that sodium has precipitated on the electrode being tested; if the test solution does not turn red, it can be assumed that no sodium has precipitated on the electrode being tested.

[0211] In this embodiment, since the phenolphthalein reagent changes color significantly from colorless to red when it encounters an electrode with precipitated sodium, the presence or absence of sodium precipitation on the electrode can be used to determine whether the electrode has precipitated sodium. Thus, the color change of the detection solution can be clearly observed through the observation window 5300, allowing for accurate judgment of whether the electrode has precipitated sodium, thereby improving the accuracy of electrode detection.

[0212] In some embodiments, the observation window 5300 is used to observe the target area where the detection liquid turns red, in order to determine the surface sodium deposition on the electrode under test that is in contact with the target area.

[0213] When testing electrodes, it's possible to encounter a situation where some areas of the test solution turn red, while other areas remain largely unchanged. This is because sodium has precipitated in the portion of the electrode in contact with this red area, while the portions in contact with other areas show minimal sodium precipitation. Therefore, the reddening of the test solution in this case allows you to pinpoint the location of sodium precipitation on the electrode.

[0214] In this embodiment of the application, the target area where the liquid color turns red can be detected through the observation window 5300, thereby quickly and accurately determining the location of sodium precipitation on the electrode to be tested, which is convenient for subsequent analysis and detection, such as facilitating the investigation of the cause of sodium precipitation.

[0215] In some embodiments, the volume of the detection solution is 10 ml to 150 ml.

[0216] As an example, the volume of phenolphthalein reagent is 80 ml.

[0217] In some embodiments, the volume of the detection solution is 10 ml to 50 ml.

[0218] As an example, the volume of phenolphthalein reagent is 40 ml.

[0219] In this embodiment, by controlling the volume of the detection liquid within the reaction chamber 5200 within a reasonable range, it is possible to ensure complete contact between the electrode to be tested and the detection liquid to allow for a reaction. This facilitates the determination of whether sodium precipitation occurs on the entire electrode to be tested, thereby enabling accurate detection of sodium precipitation. Furthermore, it reduces reagent waste and lowers costs.

[0220] In addition, if the volume of the detection liquid is within a certain range, the volume of the reaction chamber 5200 can be set within a certain range, thereby reducing the space occupancy rate of the reaction chamber 5200.

[0221] In some embodiments, the shape of the electrode to be tested includes a rectangle or a square, the first side length of the electrode to be tested ranges from 30mm to 350mm, the second side length of the electrode to be tested ranges from 60mm to 250mm, and the first side length and the second side length are perpendicular.

[0222] In some embodiments, the first side length ranges from 50mm to 250mm, and the second side length ranges from 100mm to 200mm.

[0223] The shape and size of the electrode to be tested can be described in the relevant content of the above method embodiments, and will not be repeated here.

[0224] In this embodiment, the length and width of the electrode to be tested are controlled within a reasonable range. On the one hand, this allows for a reasonable and accurate determination of the sodium deposition status of the electrodes on the production line based on the sodium deposition status of the electrodes within this size range. On the other hand, controlling the size of the electrode to be tested within a certain range can reduce electrode waste and lower production costs. For example, if the electrode assembly after the electrode to be tested has been cut still has electrode size within the production requirements and no sodium deposition is detected, the electrode assembly can still be processed to the next process, reducing excessive waste of electrode assemblies and lowering production costs.

[0225] In addition, if the size of the electrode to be tested is within a certain range, the volume of the reaction chamber 5200 can be set within a certain range to reduce the space occupancy rate of the reaction chamber 5200.

[0226] In some embodiments, the electrode to be tested is cut from a target electrode assembly, which is extracted from the manufactured motor assembly at a ratio of 1% to 10%.

[0227] Electrode assemblies typically include positive electrode plates, negative electrode plates, and separators.

[0228] For example, when producing 100 electrode assemblies, 1 to 10 electrode assemblies can be randomly selected as target electrode assemblies.

[0229] In some embodiments, the target electrode assembly is extracted from the manufactured motor assembly at a ratio of 1% to 5%.

[0230] For example, when producing 100 electrode components, one electrode component can be randomly selected as the target electrode component.

[0231] As an example, if the electrode assembly after the electrode sheet to be tested is still within the size range of the production requirements, and no sodium is precipitated after the electrode sheet is tested, the electrode assembly can continue to the next process.

[0232] In the embodiments of this application, target electrode components can be extracted from the produced electrode components at a certain ratio for testing. This can accurately reflect the sodium precipitation of the electrode components produced on the production line to a certain extent, thereby improving testing efficiency and reducing testing costs.

[0233] The technical features described in the above method embodiments are applicable to the device embodiments of this application. For the sake of brevity, the content described in the above method embodiments will not be repeated in the device embodiments.

[0234] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for detecting electrode sheets, characterized in that, The detection method includes: The electrode to be tested and the detection solution are placed into the reaction chamber to bring the electrode to be tested and the detection solution into contact. The electrode to be tested is tested based on the color change of the test solution in the reaction chamber.

2. The detection method according to claim 1, characterized in that, The electrode to be tested includes a negative electrode of a sodium-ion battery, and the detection solution includes an alkaline indicator. The step of detecting the electrode to be tested based on the color change of the detection solution in the reaction chamber includes: If the color of the detection solution changes, it is determined that sodium has been precipitated on the electrode to be tested; or, If the color of the test solution does not change, it is determined that the electrode to be tested has not precipitated sodium.

3. The detection method according to claim 2, characterized in that, The detection solution includes phenolphthalein reagent, and the step of determining sodium precipitation on the electrode under test when the color of the detection solution changes includes: If the color of the test solution turns red, it is determined that sodium has been deposited on the electrode to be tested.

4. The detection method according to claim 2 or 3, characterized in that, The detection solution includes phenolphthalein reagent. Determining that the electrode to be tested has not precipitated sodium when the color of the detection solution does not change includes: If the color of the test solution does not turn red, it is determined that the electrode to be tested has not precipitated sodium.

5. The detection method according to claim 4, characterized in that, The step of determining sodium precipitation on the electrode under test when the color of the detection solution turns red includes: If the target area of ​​the detection liquid turns red, sodium deposition is determined on the surface of the electrode to be tested that is in contact with the target area.

6. The detection method according to any one of claims 1 to 5, characterized in that, The volume of the detection solution is 10ml to 150ml.

7. The detection method according to any one of claims 1 to 6, characterized in that, The volume of the detection solution is 10ml to 50ml.

8. The detection method according to any one of claims 1 to 7, characterized in that, The shape of the electrode to be tested includes a rectangle or a square. The first side length of the electrode to be tested ranges from 30mm to 350mm, and the second side length of the electrode to be tested ranges from 60mm to 250mm. The first side length and the second side length are perpendicular.

9. The detection method according to claim 8, characterized in that, The first side length ranges from 50mm to 250mm, and the second side length ranges from 100mm to 200mm.

10. The detection method according to any one of claims 1 to 9, characterized in that, Before adding the electrode to be tested and the detection solution into the reaction chamber, the method further includes: Extract target electrode components from the produced electrode components at a ratio of 1% to 10%; The electrode to be tested is cut from the target electrode assembly.

11. The detection method according to claim 10, characterized in that, Target electrode assemblies are extracted from the produced electrode assemblies at a rate of 1% to 10%, including: The target electrode assembly is extracted from the produced electrode assembly at a ratio of 1% to 5%.

12. A device for detecting electrode sheets, characterized in that, The detection device includes: The inlet is used to dispense the electrode to be tested and the detection solution into the reaction chamber; The reaction chamber is used to contain the electrode to be tested and the detection liquid, so that the electrode to be tested is in contact with the detection liquid, and the dispensing port is provided on the reaction chamber; An observation window is used to observe the color change of the detection liquid in order to detect the electrode to be tested.

13. The detection device according to claim 12, characterized in that, The detection device also includes a detection liquid discharge port, which is located at the lower end of the side wall or the bottom wall of the reaction chamber. The detection liquid discharge port is used to discharge the detection liquid after detection.

14. The detection device according to claim 12 or 13, characterized in that, The dispensing port is also used to remove the tested electrode from the reaction chamber after testing.

15. The detection device according to any one of claims 12 to 14, characterized in that, The dispensing port is located on the top wall of the reaction chamber.

16. The detection device according to any one of claims 12 to 15, characterized in that, The detection device further includes: A housing having an opening, the reaction chamber being configured to enter and exit the housing through the opening.

17. The detection device according to claim 16, characterized in that, The first sidewall of the housing is provided with the opening, and the reaction chamber is configured to enter and exit the housing through the opening along a target direction, the target direction being perpendicular to the inner and outer surfaces of the first sidewall.

18. The detection device according to claim 17, characterized in that, The first outer side wall of the reaction chamber is provided with a handle, which is configured to push and pull the reaction chamber in and out of the housing through the opening along the target direction, and the first outer side wall is configured to close the opening when the reaction chamber is placed in the housing.

19. The detection device according to any one of claims 16 to 18, characterized in that, The inner wall of the housing and the outer wall of the reaction chamber are provided with corresponding sliding mechanisms, and the reaction chamber is configured to slide in and out of the housing via the sliding mechanisms.

20. The detection device according to any one of claims 16 to 19, characterized in that, The observation window is located in the housing.

21. The detection device according to any one of claims 17 to 20, characterized in that, The observation window is located on the first sidewall and above the opening.

22. The detection device according to any one of claims 12 to 21, characterized in that, The detection device further includes a placement mechanism disposed in the reaction chamber. The placement mechanism is used to place the electrode to be tested, and the test surface of the electrode to be tested can be observed through the observation window when the reaction chamber is placed in the housing.

23. The detection device according to any one of claims 16 to 22, characterized in that, The detection device further includes a detection liquid discharge channel, one end of which is connected to the detection liquid discharge port, and the other end of which extends to the outside of the housing.

24. The detection device according to any one of claims 12 to 23, characterized in that, The electrode to be tested includes the negative electrode of a sodium-ion battery, the detection solution includes an alkaline indicator, and the observation window is used to observe whether the color of the detection solution changes in order to determine whether the electrode to be tested has precipitated sodium.

25. The detection device according to claim 24, characterized in that, The detection solution includes phenolphthalein reagent, and the observation window is used to observe whether the color of the detection solution turns red, so as to determine whether the electrode to be tested has precipitated sodium.

26. The detection apparatus according to any one of claims 12 to 25, characterized in that, The volume of the detection solution is 10ml to 150ml.

27. The detection device according to any one of claims 12 to 26, characterized in that, The volume of the detection solution is 10ml to 50ml.

28. The detection device according to any one of claims 12 to 27, characterized in that, The shape of the electrode to be tested includes a rectangle or a square. The first side length of the electrode to be tested ranges from 30mm to 350mm, and the second side length of the electrode to be tested ranges from 60mm to 250mm. The first side length and the second side length are perpendicular.

29. The detection device according to claim 28, characterized in that, The first side length ranges from 50mm to 250mm, and the second side length ranges from 100mm to 200mm.

30. The detection device according to any one of claims 12 to 29, characterized in that, The electrode to be tested is cut from the target electrode assembly, which is extracted from the produced electrode assemblies at a ratio of 1% to 10%.

31. The detection device according to claim 30, characterized in that, The target electrode assembly is extracted from the produced electrode assemblies at a ratio of 1% to 5%.

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