Device and method for detecting sodium elution from pole piece

Abstract

The embodiment of the present application provides a detection device and a detection method for sodium precipitation of an electrode sheet. The detection device comprises: a reaction chamber, which is used for accommodating a to-be-tested electrode sheet and a detection solution, so that the to-be-tested electrode sheet is in contact with the detection solution; and a monitoring device, which is arranged on the reaction chamber and is used for monitoring gas production in the reaction chamber, so as to determine whether the to-be-tested electrode sheet precipitates sodium. The detection device and the detection method for sodium precipitation of an electrode sheet provided by the embodiment of the present application can quickly and accurately detect whether the to-be-tested electrode sheet precipitates sodium according to the gas production after the to-be-tested electrode sheet is in contact with the detection solution, can save detection time, and can greatly reduce detection cost.

Description

Technical Field

[0001] This application relates to the field of battery testing, and more specifically, to a device and method for detecting sodium deposition on electrode sheets. 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 device and method for detecting sodium deposition on electrodes, which can quickly and accurately detect the deposition on electrodes.

[0006] In a first aspect, a detection device for sodium precipitation on an electrode is provided. The detection device includes: a reaction chamber for containing an electrode to be tested and a detection liquid, so that the electrode to be tested is in contact with the detection liquid; and a monitoring device disposed on the reaction chamber for monitoring the gas generation in the reaction chamber to determine whether the electrode to be tested is precipitating sodium.

[0007] In the embodiments of this application, a monitoring device can be used to monitor the gas generation after the test electrode and the detection liquid come into contact in the reaction chamber, so as to quickly and accurately determine whether the test electrode has precipitated sodium, which can save detection time and greatly reduce detection costs.

[0008] In one possible implementation, the detection device further includes a processing module for receiving and determining whether sodium is being deposited on the electrode under test based on the gas production in the reaction chamber.

[0009] In this embodiment, the processing module can automatically determine whether the electrode to be tested has precipitated sodium based on the gas production in the reaction chamber, which can improve the accuracy of detection and facilitate the detection of sodium precipitation on the electrode.

[0010] In one possible implementation, the monitoring device includes a pressure monitoring device, which includes a pressure sensing element disposed in the reaction chamber.

[0011] In this embodiment of the application, by setting a gas pressure monitoring device in the reaction chamber, the gas pressure change in the reaction chamber can be accurately monitored, thereby enabling accurate detection of whether sodium is being deposited on the electrode under test.

[0012] In one possible implementation, the reaction chamber includes a housing and a material storage tank, and the housing is provided with a first opening. The material storage tank is used to accommodate the electrode to be tested and the detection liquid, and the material storage tank is configured to enter and exit the housing through the first opening.

[0013] In this embodiment of the application, by setting up a housing and a material trough, the material trough can be placed in the housing during testing. The housing can protect the material trough and reduce the influence of external factors on the testing, such as reducing the chance of the material trough being hit.

[0014] In one possible implementation, the material trough includes a first wall configured to close the first opening when the material trough enters the housing.

[0015] In this embodiment, when the material tank enters the housing, the first wall of the material tank seals the first opening, and the reaction chamber can form a closed space, which facilitates the monitoring device to accurately monitor the gas production in the reaction chamber, thereby accurately detecting whether sodium is precipitated in the electrode to be tested.

[0016] In one possible implementation, the opening of the material storage trough is located at the top of the material storage trough.

[0017] In this embodiment, a slot is provided at the top of the material placement tank. Through a relatively simple structural design, the slot can serve multiple purposes. On the one hand, it facilitates the diffusion of gas generated by the reaction between the electrode to be tested and the detection liquid throughout the reaction chamber, thereby enabling accurate monitoring of gas generation through a monitoring device installed on the reaction chamber; on the other hand, it facilitates the placement of the electrode to be tested and / or the detection liquid into the material placement tank.

[0018] In one possible implementation, the first opening is provided on the first sidewall of the housing, and the material inlet is configured to enter and exit the housing through the first opening in a target direction perpendicular to the inner and outer surfaces of the first sidewall.

[0019] In this embodiment of the application, by providing a first opening on the side wall of the housing, the material trough 112 can enter and exit the housing from the side of the housing, which facilitates the entry and exit of the material trough from the housing.

[0020] In one possible implementation, the outer surface of the first wall is provided with a handle, which is configured to push and pull the material trough through the first opening into and out of the housing along the target direction, wherein the first wall is a side wall of the material trough and the first wall and the first side wall are located on the same side of the reaction chamber.

[0021] In this embodiment, a handle is provided on the outer surface of the first wall of the material storage tank, which makes it easy for a person to hold the handle and push and pull the material storage tank through the first opening into and out of the housing along the target direction, thus facilitating the operation of the material storage tank in and out of the housing.

[0022] In one possible implementation, the detection device further includes a storage tank for storing the detection liquid, the storage tank being configured to inject the detection liquid into the material placement tank when the material placement tank containing the electrode to be tested enters the housing for detection.

[0023] In this embodiment, a storage tank is provided to store the test solution required for multiple tests, facilitating test solution storage. Simultaneously, the test solution can be injected into the material placement tank containing the electrode to be tested when it enters the housing for testing, simplifying operation.

[0024] In one possible implementation, the second sidewall or top wall of the housing is provided with a third opening, and the liquid storage tank is configured to enter the housing through the third opening and close the third opening.

[0025] In this embodiment, a third opening is provided on the side or top wall of the housing, allowing the storage tank to enter and exit the housing through the third opening for adding the detection liquid. Furthermore, when the storage tank enters the housing, the third opening can be sealed, making the reaction chamber airtight. This facilitates accurate monitoring of gas production during the reaction, thereby improving the accuracy of sodium precipitation detection on the electrode.

[0026] In one possible implementation, the detection device further includes a detection liquid release mechanism, which is disposed in the storage tank and is used to control the storage tank to inject the detection liquid into the feeding tank.

[0027] In this embodiment, by setting a detection liquid release mechanism, it is convenient to control the injection of detection liquid from the storage tank into the material tank, and it is also convenient to control the flow rate of detection liquid, thereby reducing the possibility of violent reaction between the electrode to be tested and the detection liquid.

[0028] In one possible implementation, the detection device further includes a drain port located in the reaction chamber for discharging the detection liquid after detection.

[0029] In this embodiment of the application, a drain port is provided on the reaction chamber to facilitate the discharge of the test liquid after detection.

[0030] In one possible implementation, the detection liquid comprises an acid solution.

[0031] In one possible implementation, the detection solution includes a sulfuric acid solution, a nitric acid solution, or a hydrochloric acid solution.

[0032] 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%.

[0033] In one possible implementation, the target electrode assembly is extracted from the produced electrode assembly at a ratio of 1% to 5%.

[0034] 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.

[0035] Secondly, a method for detecting sodium precipitation on an electrode is provided. The method includes: placing the electrode to be tested and a detection solution in a reaction chamber to bring the electrode to be tested into contact with the detection solution; monitoring the gas production in the reaction chamber using a monitoring device, wherein the monitoring device is located in the reaction chamber; and determining whether the electrode to be tested precipitates sodium based on the gas production in the reaction chamber.

[0036] In one possible implementation, monitoring the gas production in the reaction chamber using a monitoring device includes: monitoring the gas pressure changes in the reaction chamber using a gas pressure monitoring device, wherein the monitoring device includes a gas pressure monitoring device and a gas pressure sensing element disposed within the reaction chamber.

[0037] In one possible implementation, determining whether the electrode under test has precipitated sodium based on the gas production in the reaction chamber includes: determining that the electrode under test has precipitated sodium when the gas pressure change in the reaction chamber is greater than a preset value; or, determining that the electrode under test has not precipitated sodium when the gas pressure change in the reaction chamber is less than or equal to the preset value.

[0038] In one possible implementation, placing the detection liquid and the electrode to be tested in the reaction chamber includes: placing the electrode to be tested in a material storage tank and placing the material storage tank in the housing through a first opening; injecting the detection liquid into the material storage tank, wherein the reaction chamber includes the material storage tank and the housing, and the housing is provided with the first opening.

[0039] In one possible implementation, the material trough includes a first wall configured to close the first opening when the material trough enters the housing.

[0040] In one possible implementation, placing the material storage tank into the housing through the first opening includes: moving the material storage tank into the housing through the first opening along a target direction, wherein the first opening is provided on a first sidewall of the housing, and the target direction is perpendicular to the inner and outer surfaces of the first sidewall.

[0041] In one possible implementation, placing the material storage tank into the housing through the first opening includes: using a handle to push the material storage tank into the housing along the target direction through the first opening, wherein the handle is disposed on the outer surface of the first wall, and the first wall is a side wall located on the same side of the reaction chamber as the first side wall.

[0042] In one possible implementation, injecting the detection liquid into the material tank includes: injecting the detection liquid from a storage tank into the material tank, the storage tank being used to store the detection liquid.

[0043] In one possible implementation, the liquid storage tank is configured to enter the housing through a third opening and close the third opening, which is located on the second side wall or top wall of the housing.

[0044] In one possible implementation, injecting the detection liquid from the storage tank into the material storage tank includes: triggering the detection liquid release mechanism to control the injection of the detection liquid from the storage tank into the material storage tank, wherein the detection liquid release mechanism is disposed in the storage tank.

[0045] In one possible implementation, before placing the detection solution and the electrode to be tested in the reaction chamber, the detection 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.

[0046] In one possible implementation, the step of extracting the 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%.

[0047] In one possible implementation, the detection liquid comprises an acid solution.

[0048] In one possible implementation, the detection solution includes a sulfuric acid solution, a nitric acid solution, or a hydrochloric acid solution. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the structure of the detection device for sodium precipitation on the electrode provided in an embodiment of this application.

[0050] Figure 2 This is a schematic diagram of the structure of the detection device for sodium precipitation on the electrode provided in an embodiment of this application.

[0051] Figure 3 This is a schematic diagram of the structure of the detection device for sodium precipitation on the electrode provided in an embodiment of this application.

[0052] Figure 4 This is a schematic flowchart of the method for detecting sodium deposition on electrodes provided in an embodiment of this application.

[0053] Figure 5 This is a schematic flowchart of the method for detecting sodium precipitation on electrodes provided in the embodiments of this application.

[0054] Figure 6 This is a schematic flowchart of the method for detecting sodium precipitation on electrodes provided in the embodiments of this application.

[0055] Figure 7 This is a schematic flowchart of the method for detecting sodium precipitation on electrodes provided in the embodiments of this application.

[0056] Figure label:

[0057] Reaction chamber: 110, shell: 111, first opening 1111, first side wall 1112, third opening 1113, top wall 1114, material trough: 112, first wall 1121, trough opening 1122, handle: 113, monitoring device: 120, liquid storage tank: 130, detection liquid release mechanism: 131, drain port: 140. Detailed Implementation

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] To address the aforementioned issues, this application provides a detection device and method for detecting sodium precipitation on an electrode. The detection device includes: a reaction chamber for containing the electrode to be tested and a detection liquid, allowing the electrode to be tested and the detection liquid to come into contact; and a monitoring device disposed in the reaction chamber for monitoring the gas generation within the reaction chamber to determine whether the electrode to be tested is precipitating sodium.

[0069] The detection device and method for sodium precipitation on electrodes provided in this application can quickly and accurately detect whether sodium is precipitated on the electrode under test based on the gas generation after the electrode and the detection liquid come into contact. This can save detection time and greatly reduce detection costs.

[0070] The following combination Figures 1 to 3 The detection device 100 for sodium precipitation on electrodes provided in the embodiments of this application will be described by way of example.

[0071] The detection device 100 includes a reaction chamber 110 and a monitoring device 120.

[0072] The reaction chamber 110 is used to contain the electrode to be tested and the detection solution, so that the electrode to be tested is in contact with the detection solution.

[0073] The monitoring device 120 is installed on the reaction chamber to monitor the gas production in the reaction chamber 110 in order to determine whether sodium is precipitated on the electrode to be tested.

[0074] In this embodiment, the detection liquid may include a liquid that reacts with sodium to produce gas but does not react with the electrode under test (or reacts but does not produce gas). That is, the detection liquid can react with the electrode under test on which sodium has been deposited to produce gas, but does not react with the electrode under test on which no sodium has been deposited to produce gas (or reacts but does not produce gas).

[0075] As an example, the electrode to be tested can be placed in the reaction chamber 110 first, and then the detection solution can be injected into the reaction chamber 110.

[0076] The electrode to be tested and the detection solution are placed in the reaction chamber 110, allowing the electrode to come into contact with the detection solution. The gas production within the reaction chamber 110 can then be monitored using a monitoring device 120 to determine whether sodium has been precipitated on the electrode. For example, if gas is produced after the electrode comes into contact with the detection solution, it indicates that sodium has been precipitated on the electrode; if no gas is produced, it indicates that no sodium has been precipitated on the electrode.

[0077] The electrode sodium precipitation detection device 100 provided in this application embodiment can use the monitoring device 120 to monitor the gas generation after the electrode to be tested and the detection liquid come into contact in the reaction chamber 110, and quickly and accurately determine whether the electrode to be tested precipitates sodium, which can save detection time and greatly reduce detection costs.

[0078] In some embodiments, the monitoring device 120 may include a pressure monitoring device such as a pressure sensor, the pressure monitoring device including a pressure sensing element disposed in the reaction chamber.

[0079] As an example, a pressure monitoring device, such as a pressure sensor, can be installed inside the reaction chamber 110 to monitor pressure changes within the chamber and determine whether sodium has been deposited on the electrode under test. For instance, if the pressure change within the reaction chamber 110 exceeds a preset value, sodium is determined to have been deposited on the electrode; if the pressure change within the reaction chamber 110 is less than the preset value, sodium is determined not to have been deposited on the electrode.

[0080] Optionally, the pressure monitoring device may also include a display, which may be located outside the reaction chamber 110. The display of the pressure monitoring device can show the pressure changes inside the reaction chamber 110.

[0081] In this embodiment of the application, by setting a gas pressure monitoring device on the reaction chamber 110, the gas pressure change in the reaction chamber 110 can be accurately monitored, thereby enabling accurate detection of whether sodium is being deposited on the electrode under test.

[0082] In some embodiments, the detection device 100 may further include a processing module, which can receive gas pressure information in the reaction chamber 110 monitored by a gas pressure sensor, and determine the gas production situation in the reaction chamber 110 based on the gas pressure information, thereby determining whether the electrode to be tested has precipitated sodium.

[0083] As an example, the processing module can be connected to a pressure monitoring device, thereby receiving pressure changes within the reaction chamber 110 monitored by the pressure monitoring device.

[0084] The processing module can be installed on the outer wall of the reaction chamber 110, or it can be installed separately from the reaction chamber 110. The embodiment of this application does not limit the location of the processing module.

[0085] In this embodiment, the processing module can automatically determine whether the electrode to be tested has precipitated sodium based on the gas production in the reaction chamber, which can improve the accuracy of detection and facilitate the detection of sodium precipitation on the electrode.

[0086] In some embodiments, the monitoring device 120 may include an observation window disposed on the reaction chamber 110.

[0087] As an example, the reaction chamber 110 can be made of transparent material, and the presence of gas (such as whether the test liquid produces bubbles) can be manually monitored through the observation window. If gas is generated in the reaction chamber 110, it can be considered that sodium has been precipitated on the electrode to be tested; if no gas is generated in the reaction chamber 110, it can be considered that sodium has not been precipitated on the electrode to be tested.

[0088] In some embodiments, such as Figure 2 and Figure 3 As shown, the reaction chamber 110 includes a housing 111 and a material storage tank 112. The housing 111 is provided with a first opening 1111. The material storage tank 112 is used to accommodate the electrode to be tested and the detection liquid. The material storage tank 120 is configured to enter and exit the housing 111 through the first opening 1111.

[0089] As an example, during testing, the material trough 112 can enter the housing 111 through the first opening 1111. When testing is completed, the material trough 112 can be removed from the housing 111 through the first opening 1111.

[0090] In this embodiment of the application, by setting a housing 111 and a material trough 112, the material trough 112 can be placed in the housing 111 during the detection process. The housing 111 can protect the material trough 112 and reduce the influence of external factors on the detection, such as reducing the chance of the material trough being hit.

[0091] In some embodiments, the material trough 112 includes a first wall 1121, which is configured to close the first opening 1111 when the material trough 112 enters the housing 111.

[0092] During testing, the material trough 112 is placed in the housing 111, and the first wall 1121 of the material trough 112 can close the first opening 1111 so that the reaction chamber 110 forms a closed space.

[0093] As an example, a sealing gasket can be placed on the first wall 1121 at the position that contacts the first opening 1111.

[0094] In this embodiment of the application, when the material trough 112 enters the housing 111, the first wall 1121 of the material trough 112 seals the first opening 1111, and the reaction chamber 110 can form a closed space, which facilitates the monitoring device 120 to accurately monitor the gas production in the reaction chamber 110, thereby accurately detecting whether the electrode to be tested is precipitating sodium.

[0095] In some embodiments, the opening 1122 of the material storage tank 112 is disposed at the top of the material storage tank 112.

[0096] During testing, the gas generated by the reaction between the electrode under test and the test liquid can diffuse into the housing 111 through the slot 1122 of the material tank 112. That is, the gas generated by the reaction between the electrode under test and the test liquid is contained in the reaction chamber 110, so the gas generation can be monitored by the monitoring device 120 installed on the reaction chamber 110.

[0097] In addition, the slot 1122 can also serve as a feeding port for the electrode to be tested and / or an injection port for the test solution. For example, the electrode to be tested and / or the test solution can be placed into the feeding tank 112 through the slot 1122.

[0098] In this application, a slot 1122 is provided at the top of the material storage tank 112. Through a relatively simple structural design, the slot can serve multiple purposes. On the one hand, it facilitates the diffusion of gas generated by the reaction between the electrode to be tested and the detection liquid throughout the reaction chamber 110, thereby enabling accurate monitoring of gas generation by the monitoring device 120 installed on the reaction chamber 110; on the other hand, it facilitates the placement of the electrode to be tested and / or the detection liquid into the material storage tank 112.

[0099] In some embodiments, the first sidewall 1112 of the housing 111 is provided with a first opening 1111, and the material inlet 112 is configured to enter and exit the housing 111 through the first opening 1111 along a target direction, the target direction being perpendicular to the inner and outer surfaces of the first sidewall 1112.

[0100] As an example, the housing 111 can be a regular cuboid or cube shape, and a first opening 1111 is provided on the first side wall 1112 of the housing 111. The material trough 112 can enter and exit the housing 111 along a direction perpendicular to the inner and outer surfaces of the first side wall 1112.

[0101] The first sidewall 1112 can be any one of the sidewalls of the shell 111.

[0102] In this embodiment of the application, by providing a first opening 1111 on the side wall of the housing 111, the material trough 112 can enter and exit the housing 111 from the side of the housing 111, which facilitates the material trough 112 entering and exiting the housing 111.

[0103] In some embodiments, a handle 113 is provided on the outer surface of the first wall 1121 of the material storage tank 112. The handle 113 is configured to push and pull the material storage tank 112 through the first opening 1111 into and out of the housing 111 along the target direction. The first wall 1121 is the side wall of the material storage tank 112 and the first wall 1121 and the first side wall 1112 are located on the same side of the reaction chamber 110.

[0104] As an example, the reaction chamber 110 may include four sides: front, back, left, and right. The first wall 1121 of the material storage tank 112 and the first side wall 1112 of the shell 111 are both located on the same side of the reaction chamber 110, such as the left side.

[0105] The handle 113 can push and pull the material trough 112 along a direction perpendicular to the inner and outer surfaces of the first wall 1121 or the first side wall 1112.

[0106] For example, by using the handle 113 to pull the material tray 112 out of the housing 111 along the target direction, the electrode to be tested is placed into the material tray 112 through the slot 1122 of the material tray 112. Then, by using the handle 113 to push the material tray 112 into the housing 111 along the target direction, so that the first wall 1121 of the material tray 112 closes the first opening 1111 of the housing 111.

[0107] In this embodiment of the application, by providing a handle 113 on the outer surface of the first wall 1121 of the material storage trough 112, it is convenient for a person to hold the handle 113 and push and pull the material storage trough 112 along the target direction to enter and exit the housing 111 through the first opening 1111, so as to facilitate the operation of the material storage trough 112 to enter and exit the housing 111.

[0108] In some embodiments, the inner wall of the housing 111 and the outer wall of the material storage trough 112 are provided with corresponding sliding mechanisms, and the material storage trough 112 is configured to slide in and out of the housing 111 through the sliding mechanisms.

[0109] As an example, a corresponding slide rail mechanism, such as a drawer slide rail, can be provided on the inner side wall of the housing 111 and the outer side wall of the material storage groove 112. Alternatively, a corresponding slide rail mechanism, such as a drawer slide rail, can be provided on the inner bottom wall of the housing 111 and the outer bottom wall of the material storage groove 112.

[0110] In this embodiment of the application, by providing corresponding sliding mechanisms on the inner wall of the housing 111 and the outer wall of the material trough 112, the material trough 112 can move in and out of the housing 111 more effortlessly.

[0111] In some embodiments, the detection device 100 further includes a liquid storage tank 130 for storing detection liquid, and the liquid storage tank 130 is configured to inject detection liquid into the material storage tank 112 when the material storage tank 112 containing the electrode to be tested enters the housing 111 for detection.

[0112] As an example, the storage tank 130 can store the test solution required for at least one test.

[0113] The electrode to be tested is placed in the material tank 112 and enters the housing 111 along with the material tank 112. Then the liquid storage tank 130 can release the test liquid required for one test into the material tank 112.

[0114] As an example, the liquid storage tank 130 can be located inside the housing 111, such as above the material storage tank 112. Alternatively, the liquid storage tank 130 can be located outside the housing 111 and extended into the housing 111 via a pipeline.

[0115] In this embodiment, by providing a storage tank 130, the test liquid required for multiple tests can be stored in the storage tank 130, facilitating the storage of the test liquid. Simultaneously, the test liquid can be injected into the material placement tank 112, which contains the electrode to be tested, when it enters the housing 111 for testing, simplifying operation.

[0116] In some embodiments, the second sidewall of the housing 111 is provided with a third opening 1113, and the liquid storage tank 130 is configured to be placed in the housing 111 through the third opening 1113 and to close the third opening 1113.

[0117] The second sidewall can be any sidewall of the housing 111. For example, the second sidewall can be the same sidewall as the first sidewall. Alternatively, the second sidewall can be a sidewall that intersects with the first sidewall.

[0118] The electrode to be tested is placed in the material storage tank 112 and then enters the housing 111 along with the material storage tank 112. Simultaneously, the first wall 1121 of the material storage tank 112 can close the second opening 1111. The storage tank 130 containing the detection liquid can be placed in the housing 111 through the third opening 1113 and the third opening 1113 can be closed. After both the material storage tank 112 containing the electrode to be tested and the storage tank 130 containing the detection liquid are placed in the housing 111, the storage tank 130 can inject the detection liquid into the material storage tank 112.

[0119] Optionally, in some embodiments, the top wall 1114 of the housing 111 may be provided with a third opening 1113 (the case where the top wall 1114 is provided with a third opening 1113 is not shown in the figure), and the liquid storage tank 130 is configured to be placed in the housing 111 through the third opening 1113 and to close the third opening 1113.

[0120] The detection device provided in this application embodiment allows the storage tank 130 to enter and exit the housing 111 through a third opening 1113 on the side or top wall of the housing 111, so as to add detection liquid to the storage tank 130. Furthermore, when the storage tank 130 enters the housing 111, the third opening 1113 can be sealed, making the reaction chamber 110 airtight. This facilitates accurate monitoring of gas production in the reaction 110, thereby improving the accuracy of sodium precipitation detection on the electrode.

[0121] In some embodiments, when the liquid storage tank 130 is placed in the housing 111, the third opening 1113 is closed by the side wall of the liquid storage tank 130 that is on the same side as the second side wall located in the reaction chamber 110.

[0122] In some embodiments, the detection device 100 further includes a detection liquid release mechanism 131, which is disposed in the storage tank 130 and is used to control the storage tank 130 to inject detection liquid into the feeding tank 112.

[0123] When both the material storage tank 112 containing the electrode to be tested and the liquid storage tank 130 storing the test liquid are placed in the housing, the liquid storage tank 130 can inject the test liquid into the material storage tank 112. The injection of the test liquid from the liquid storage tank 130 into the material storage tank 112 can be controlled by controlling the test liquid release mechanism 131. For example, the test liquid release mechanism 131 can be triggered to control the injection of the test liquid from the liquid storage tank 130 into the material storage tank 112.

[0124] In this embodiment, by setting the detection liquid release mechanism 131, it is convenient to control the injection of the detection liquid in the storage tank 130 into the material tank 112, and it is also convenient to control the flow rate of the detection liquid, thereby reducing the possibility of a violent reaction between the electrode to be tested and the detection liquid.

[0125] In some embodiments, the detection device 100 further includes a drain port 140, which is disposed in the reaction chamber 110 and is used to discharge the detection liquid after detection.

[0126] As an example, the drain port 140 can be provided on the bottom wall or side wall of the reaction chamber. For example, the drain port 140 can be provided on the bottom wall of the housing 111 and the material storage tank 112.

[0127] In this embodiment of the application, a drain port 140 is provided on the reaction chamber 110 to facilitate the discharge of the test liquid after the test.

[0128] In some embodiments, the detection solution includes an acid solution.

[0129] The electrode to be tested for sodium deposition detection is typically the negative electrode of a sodium-ion battery. Negative electrodes generally do not react with acid solutions. However, if sodium is deposited on the negative electrode, the deposited sodium reacts with the acid solution to produce gas. Therefore, the gas production observed after the electrode comes into contact with the acid solution can be used to determine whether sodium has been deposited on the electrode.

[0130] In some embodiments, the detection solution includes sulfuric acid solution, nitric acid solution, or hydrochloric acid solution.

[0131] In some embodiments, the volume of the detection solution ranges from 1 ml to 10 ml, and the concentration of the detection solution ranges from 0.5 mol / L to 4 mol / L.

[0132] As an example, the volume of sulfuric acid is 4 ml, and the concentration of the sulfuric acid solution is 3 mol / L.

[0133] In some embodiments, the volume of the detection solution ranges from 1 ml to 4 ml, and the concentration of the detection solution ranges from 0.5 mol / L to 2 mol / L.

[0134] As an example, the volume of sulfuric acid is 2 ml, and the concentration of the sulfuric acid solution is 1 mol / L.

[0135] 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, thereby facilitating the determination of whether sodium deposition occurs on the entire electrode under test and enabling accurate detection of sodium deposition. Furthermore, it can reduce the amount of detection liquid used to some extent, thus lowering costs.

[0136] By controlling the concentration of the detection solution within a reasonable range, it is possible to ensure that the electrode under test can fully react with the detection solution even when sodium precipitation is severe, thereby accurately determining the gas production status of the electrode under test.

[0137] In some embodiments, the electrode to be tested is circular, and the diameter of the electrode to be tested ranges from 10 mm to 100 mm.

[0138] As an example, the diameter of the electrode to be tested is 80 mm.

[0139] In some embodiments, the electrode to be tested is circular, and the diameter of the electrode to be tested ranges from 10 mm to 40 mm.

[0140] As an example, the diameter of the electrode to be tested is 20 mm.

[0141] In this embodiment, the size of the electrode to be tested is controlled within a reasonable range. On the one hand, the sodium precipitation of the electrode within this size range can reasonably and accurately reflect the sodium precipitation 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 required for testing, thereby reducing 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 precipitation is detected, the electrode assembly can still be processed to the next process, reducing excessive waste of electrode assemblies and lowering production costs.

[0142] 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%.

[0143] Electrode assemblies typically include positive electrode plates, negative electrode plates, and separators.

[0144] For example, when producing 100 electrode assemblies, 1 to 10 electrode assemblies can be randomly selected as target electrode assemblies.

[0145] In some embodiments, the target electrode assembly is extracted from the manufactured motor assembly at a ratio of 1% to 5%.

[0146] For example, when producing 100 electrode components, one electrode component can be randomly selected as the target electrode component.

[0147] 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.

[0148] 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.

[0149] The detection device for sodium precipitation on electrodes according to embodiments of this application has been described in detail above. The following will be combined with… Figures 4 to 7The method for detecting sodium precipitation on electrode sheets according to embodiments of this application is described in detail. The technical features described in the above-described apparatus embodiments are applicable to the following method embodiments.

[0150] Figure 4 This is a schematic flowchart of the method for detecting sodium deposition on electrodes provided in an embodiment of this application.

[0151] 410. Place the electrode to be tested and the detection solution in the reaction chamber so that the electrode to be tested comes into contact with the detection solution.

[0152] As an example, the electrode to be tested can be placed in the reaction chamber first, and then the detection solution can be injected into the reaction chamber.

[0153] In this embodiment, the reaction chamber is a container for holding the electrode to be tested and the detection liquid, so that the electrode to be tested and the detection liquid can come into contact.

[0154] In this embodiment, the detection liquid may include a liquid that reacts with sodium to produce gas but does not react with the electrode under test itself (or reacts but does not produce gas). That is, the detection liquid can react with the electrode under test on which sodium has been deposited to produce gas, but does not react with the electrode under test on which sodium has not been deposited to produce gas (or reacts but does not produce gas).

[0155] 420. Use a monitoring device to monitor the gas production in the reaction chamber.

[0156] The monitoring device can be used to monitor the gas production after the test electrode comes into contact with the test liquid in the reaction chamber.

[0157] 430. Based on the gas production in the reaction chamber, determine whether the electrode to be tested has precipitated sodium.

[0158] As an example, if bubbles are generated in the reaction chamber, it indicates that sodium is reacting with the detection solution, and it can be considered that sodium has been precipitated on the electrode to be tested; if no bubbles are generated in the reaction chamber, it indicates that sodium is not reacting with the detection solution, and it can be considered that sodium has not been precipitated on the electrode to be tested.

[0159] In the embodiments of this application, a monitoring device can be used to monitor the gas generation after the test electrode and the detection liquid come into contact in the reaction chamber, so as to quickly and accurately determine whether the test electrode has precipitated sodium, which can save detection time and greatly reduce detection costs.

[0160] In some embodiments, the monitoring device may include an observation window disposed on the reaction chamber. For example, the reaction chamber 110 may be made of a transparent material, and the presence of gas in the reaction chamber (such as whether the detection liquid produces bubbles) may be manually monitored through the observation window. If gas is generated in the reaction chamber, it may be considered that sodium has been precipitated on the electrode to be tested; if no gas is generated in the reaction chamber, it may be considered that sodium has not been precipitated on the electrode to be tested.

[0161] In some embodiments, the monitoring device may include a pressure monitoring device such as a barometer, the pressure monitoring device including a pressure sensing element disposed in the reaction chamber.

[0162] Pressure monitoring devices can be used to monitor changes in pressure within the reaction chamber.

[0163] The following example uses a barometric pressure monitoring device. Figure 5 The detection method for sodium precipitation on electrode plates provided in the embodiments of this application will be further illustrated by example.

[0164] 510. Place the electrode to be tested and the detection solution in the reaction chamber so that the electrode to be tested comes into contact with the detection solution.

[0165] The content of step 510 can be found in the relevant description in step 410, and will not be repeated here.

[0166] 520. Use a pressure monitoring device to monitor the pressure changes in the reaction chamber.

[0167] As an example, the sensing element of the pressure monitoring device is placed in the reaction chamber to monitor changes in pressure within the reaction chamber.

[0168] In this embodiment of the application, by setting a gas pressure monitoring device on the reaction chamber, the gas production in the reaction chamber can be accurately monitored, thereby accurately detecting whether sodium is precipitated on the electrode under test.

[0169] 530a, when the gas pressure change in the reaction chamber is greater than the preset value, sodium precipitation on the electrode to be tested is determined.

[0170] 530b, when the pressure change in the reaction chamber is less than or equal to a preset value, determine that no sodium has been deposited on the electrode to be tested.

[0171] That is, if the amount of gas produced in the reaction chamber is greater than a certain value, it is determined that sodium has been precipitated on the electrode to be tested; if the amount of gas produced in the reaction chamber is less than or equal to the certain value, it is determined that no sodium has been precipitated on the electrode to be tested.

[0172] In the embodiments of this application, the change in gas pressure in the reaction chamber can be used to determine more accurately whether the electrode to be tested has precipitated sodium.

[0173] In some embodiments, the preset value is greater than or equal to 0.101 MPa.

[0174] In some embodiments, the electrode to be tested can be placed in a material storage tank, and the material storage tank is placed in the housing through a first opening; then, a detection liquid is injected into the material storage tank, wherein the reaction chamber includes a material storage tank and a housing, and the housing is provided with a first opening. (The following is a continuation of the previous paragraph.) Figure 6The detection method further illustrates the process of placing the detection solution and the electrode to be tested in the reaction chamber.

[0175] Figure 6 This is a schematic flowchart of the method for detecting sodium deposition on electrodes provided in an embodiment of this application.

[0176] 610. Place the electrode to be tested in the material placement groove, and place the material placement groove into the housing through the first opening.

[0177] The reaction chamber includes a material storage tank and a shell, with a first opening on the shell.

[0178] In this embodiment, during testing, the material trough can enter the housing through the first opening. Of course, upon completion of testing, the material trough can also be removed from the housing through the first opening.

[0179] In some embodiments, the feed trough includes a first wall configured to close a first opening when the feed trough enters the housing.

[0180] In this embodiment, when the material trough enters the housing to test the electrode sheet, the first wall closes the first opening to form a sealed space in the reaction chamber.

[0181] As an example, a sealing gasket can be placed on the first wall at the location where it contacts the first opening.

[0182] In this embodiment, when the material tank enters the housing, the first wall seals the first opening, so that when the electrode to be tested is tested, the reaction chamber forms a closed space, which facilitates the monitoring device to accurately monitor the gas production in the reaction chamber, thereby accurately detecting whether sodium is precipitated in the electrode to be tested.

[0183] In some embodiments, the opening of the material storage trough is located at the top of the material storage trough.

[0184] During testing, the gas generated by the reaction between the electrode under test and the test solution can diffuse into the housing through the opening of the material storage tank. In other words, the gas generated by the reaction between the electrode under test and the test solution is contained within the reaction chamber, allowing the gas generation to be monitored by a monitoring device installed on the reaction chamber.

[0185] In addition, the slot can also serve as a feeding port for the electrode to be tested and / or an injection port for the test solution. For example, the electrode to be tested and / or the test solution can be placed into the feeding tank through the slot.

[0186] In this application, by setting an opening at the top of the material storage tank, multiple uses can be achieved through a relatively simple structural design. On the one hand, it facilitates the diffusion of gas generated by the reaction between the electrode to be tested and the detection liquid throughout the reaction chamber, thereby enabling accurate monitoring of gas generation through a monitoring device installed on the reaction chamber; on the other hand, it facilitates the placement of the electrode to be tested and / or the detection liquid into the material storage tank.

[0187] In some embodiments, the material trough can be moved into the housing through the first opening along the target direction, and the first opening is provided on the first sidewall of the housing, with the target direction perpendicular to the inner and outer surfaces of the first sidewall.

[0188] As an example, the housing can be a regular cuboid or cube shape, with a first opening on the first side wall of the housing, and the material trough can move into the housing along a direction perpendicular to the inner and outer surfaces of the first side wall.

[0189] The first sidewall can be any sidewall of the shell.

[0190] In this embodiment of the application, by providing a first opening on the side wall of the housing, the material trough can enter and exit the housing from the side of the housing, which facilitates the entry and exit of the material trough from the housing.

[0191] In some embodiments, a handle can be used to push the material trough into the housing through the first opening along the target direction. The handle is located on the outer surface of the first wall, which is a side wall located on the same side of the reaction chamber as the first side wall.

[0192] As an example, the reaction chamber may include four sides: front, back, left, and right. The first wall of the material storage tank and the first side wall of the shell are both located on the same side of the reaction chamber, such as the left side.

[0193] Using the handle, push the material trough into the housing along the direction perpendicular to the inner and outer surfaces of the first wall or the first side wall, so that the first wall of the material trough closes the first opening of the housing.

[0194] In this embodiment, a handle is provided on the outer surface of the first wall of the material storage tank, which makes it easy for a person to hold the handle and push the material storage tank into the housing through the first opening along the target direction, thus facilitating the operation of the material storage tank in and out of the housing.

[0195] 620. Inject the test solution into the material tank.

[0196] After the material tank is moved into the housing, the test liquid is injected into the material tank.

[0197] In some embodiments, the detection liquid in the storage tank can be injected into the material feeding tank.

[0198] The storage tank is used to store the test liquid. The test liquid in the storage tank is injected into the material placement tank, which contains the electrode to be tested, after the material placement tank is placed into the housing.

[0199] As an example, the storage tank can store the test solution required for at least one test. During each test, the storage tank can fill the feed trough with the test solution required for one test.

[0200] As an example, the liquid storage tank can be installed inside the housing, such as above the material storage tank, or it can be installed outside the housing and extended into the housing via pipelines.

[0201] In this embodiment, a storage tank is provided to store the test solution required for multiple tests, facilitating test solution storage. Simultaneously, the test solution can be injected into the material placement tank containing the electrode to be tested when it enters the housing for testing, simplifying operation.

[0202] In some embodiments, the reservoir is configured to enter the housing through a third opening and close the third opening, which is located on the second side wall or top wall of the housing.

[0203] The second sidewall can be any sidewall of the shell. For example, the second sidewall can be the same sidewall as the first sidewall. Alternatively, the second sidewall can be a sidewall that intersects with the first sidewall.

[0204] The storage tank containing the detection liquid can be placed inside the shell through a third opening and the third opening can be sealed to form a closed space for the reaction chamber.

[0205] As an example, when the reservoir is placed in the housing, the third opening is closed by the side wall of the reservoir that is on the same side as the second side wall located on the reaction chamber.

[0206] In some embodiments, injecting the detection liquid from the storage tank into the feeding tank includes: triggering a detection liquid release mechanism to control the injection of the detection liquid from the storage tank into the feeding tank, wherein the detection liquid release mechanism is disposed in the storage tank.

[0207] In this embodiment of the application, by triggering the detection liquid release mechanism, the detection liquid in the storage tank can be controlled to be injected into the material trough, which facilitates the control of the detection liquid flow rate and reduces the possibility of violent reaction between the electrode to be tested and the detection liquid.

[0208] 630. Use monitoring devices to monitor the gas production in the reaction chamber.

[0209] 640. Based on the gas production in the reaction chamber, determine whether the electrode to be tested has precipitated sodium.

[0210] The contents of steps 630 and 640 can be found in the descriptions of steps 420 and 430, and will not be repeated here.

[0211] Figure 7This is a schematic flowchart of the method for detecting sodium deposition on electrodes provided in an embodiment of this application.

[0212] 710. Extract the target electrode assembly from the produced electrode assembly at a ratio of 1% to 10%.

[0213] Electrode assemblies typically include positive electrode plates, negative electrode plates, and separators.

[0214] For example, when producing 100 electrode assemblies, 1 to 10 electrode assemblies can be randomly selected as target electrode assemblies.

[0215] In some embodiments, target electrode assemblies are extracted from the produced electrode assemblies at a ratio of 1% to 5%.

[0216] For example, when producing 100 electrode components, one electrode component can be randomly selected as the target electrode component.

[0217] 720. Cut the electrode to be tested from the target electrode assembly.

[0218] 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.

[0219] 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.

[0220] 730. Place the electrode to be tested in the material placement groove, and place the material placement groove into the housing through the first opening.

[0221] The reaction chamber includes a material storage tank and a shell, with a first opening on the shell.

[0222] In some embodiments, the first opening is closed when the material trough is placed in the housing.

[0223] In some embodiments, the material trough is pushed into the housing through the first opening along the target direction using a handle, so that the first outer side wall closes the first opening. The first outer side wall of the material trough is provided with a handle, and the first side wall of the housing is provided with a first opening. The target direction is perpendicular to the first outer side wall.

[0224] 740, release the test liquid from the storage tank into the material placement tank.

[0225] 750. The pressure changes in the reaction chamber are monitored using a pressure monitoring device.

[0226] 760a, when the gas pressure change in the reaction chamber is greater than the preset value, sodium precipitation on the electrode to be tested is determined.

[0227] 760b, when the pressure change in the reaction chamber is less than or equal to a preset value, it is determined that no sodium has been deposited on the electrode to be tested.

[0228] The contents of steps 730 to 760 can be referred to in the relevant description above, and will not be repeated here.

[0229] In some embodiments, the detection solution includes an acid solution.

[0230] In some embodiments, the detection solution includes sulfuric acid solution, nitric acid solution, or hydrochloric acid solution.

[0231] In some embodiments, the volume of the detection solution ranges from 1 ml to 10 ml, and the concentration of the detection solution ranges from 0.5 mol / L to 4 mol / L.

[0232] In some embodiments, the volume of the detection solution ranges from 1 ml to 4 ml, and the concentration of the detection solution ranges from 0.5 mol / L to 2 mol / L.

[0233] In some embodiments, the electrode to be tested is circular, and the diameter of the electrode to be tested ranges from 10 mm to 100 mm.

[0234] In some embodiments, the electrode to be tested is circular, and the diameter of the electrode to be tested ranges from 10 mm to 40 mm.

[0235] The technical features described in the above device embodiments are applicable to the method embodiments of this application. For the sake of brevity, the content described in the above device embodiments will not be repeated in the method embodiments.

[0236] 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 device for detecting sodium precipitation on electrodes, characterized in that, The detection device includes: A reaction chamber for containing the electrode to be tested and the detection solution, so that the electrode to be tested is in contact with the detection solution; A monitoring device is installed in the reaction chamber to monitor the gas production within the reaction chamber in order to determine whether the electrode under test is precipitating sodium.

2. The detection device according to claim 1, characterized in that, The detection device further includes: The processing module is used to receive and determine whether the electrode to be tested is precipitating sodium based on the gas production in the reaction chamber.

3. The detection device according to claim 1 or 2, characterized in that, The monitoring device includes a pressure monitoring device, which includes a pressure sensing element, and the pressure sensing element is disposed in the reaction chamber.

4. The detection device according to any one of claims 1 to 3, characterized in that, The reaction chamber includes a shell and a material storage tank, and the shell is provided with a first opening. The material storage tank is used to accommodate the electrode to be tested and the detection liquid. The material storage tank is configured to enter and exit the shell through the first opening.

5. The detection device according to claim 4, characterized in that, The material inlet includes a first wall configured to close the first opening when the material inlet enters the housing.

6. The detection device according to claim 4 or 5, characterized in that, The opening of the material storage trough is located at the top of the material storage trough.

7. The detection device according to claim 5, characterized in that, The first opening is provided on the first sidewall of the housing, and the material trough is configured to enter and exit the housing through the first opening along a target direction, the target direction being perpendicular to the inner and outer surfaces of the first sidewall.

8. The detection device according to claim 7, characterized in that, A handle is provided on the outer surface of the first wall. The handle is configured to push and pull the material trough through the first opening into and out of the housing along the target direction. The first wall is the side wall of the material trough and the first wall and the first side wall are located on the same side of the reaction chamber.

9. The detection device according to any one of claims 4 to 8, characterized in that, The detection device further includes a liquid storage tank for storing the detection liquid, and the liquid storage tank is configured to inject the detection liquid into the material placement tank when the material placement tank containing the electrode to be tested enters the housing for detection.

10. The detection device according to claim 9, characterized in that, The second side wall or top wall of the housing is provided with a third opening, and the liquid storage tank is configured to enter the housing through the third opening and close the third opening.

11. The detection device according to claim 9 or 10, characterized in that, The detection device further includes: A detection liquid release mechanism is provided in the liquid storage tank and is used to control the liquid storage tank to inject the detection liquid into the material feeding tank.

12. The detection device according to any one of claims 1 to 11, characterized in that, The detection device also includes a drain port, which is located in the reaction chamber and is used to discharge the detection liquid after detection.

13. The detection device according to any one of claims 1 to 12, characterized in that, The detection solution includes an acid solution.

14. The detection device according to any one of claims 1 to 13, characterized in that, The detection solution includes sulfuric acid solution, nitric acid solution, or hydrochloric acid solution.

15. The detection device according to any one of claims 1 to 14, 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%.

16. The detection device according to claim 15, characterized in that, The target electrode assembly is extracted from the produced electrode assemblies at a ratio of 1% to 5%.

17. A method for detecting sodium precipitation on electrodes, characterized in that, The detection method includes: The electrode to be tested and the detection solution are placed in the reaction chamber so that the electrode to be tested comes into contact with the detection solution; The gas production in the reaction chamber is monitored using a monitoring device, which is installed in the reaction chamber. Based on the gas production in the reaction chamber, determine whether the electrode to be tested has precipitated sodium.

18. The detection method according to claim 17, characterized in that, The monitoring of gas production in the reaction chamber using a monitoring device includes: The pressure changes in the reaction chamber are monitored using a pressure monitoring device, which includes a pressure sensing element disposed in the reaction chamber.

19. The detection method according to claim 18, characterized in that, The step of determining whether the electrode to be tested has precipitated sodium based on the gas production in the reaction chamber includes: If the pressure change in the reaction chamber exceeds a preset value, sodium is determined to be deposited on the electrode to be tested; or, If the pressure change in the reaction chamber is less than or equal to the preset value, it is determined that no sodium has been deposited on the electrode to be tested.

20. The detection method according to any one of claims 17 to 19, characterized in that, The step of placing the detection solution and the electrode to be tested in the reaction chamber includes: The electrode to be tested is placed in the material placement groove, and the material placement groove is placed in the housing through the first opening; The detection liquid is injected into the material tank, wherein the reaction chamber includes the material tank and the housing, and the housing is provided with the first opening.

21. The detection method according to claim 20, characterized in that, The material inlet includes a first wall configured to close the first opening when the material inlet enters the housing.

22. The detection method according to claim 21, characterized in that, The step of placing the material storage tank into the housing through the first opening includes: The material feeding trough is moved into the housing through the first opening along the target direction. The first opening is provided on the first side wall of the housing, and the target direction is perpendicular to the inner and outer surfaces of the first side wall.

23. The detection method according to claim 22, characterized in that, The step of placing the material storage tank into the housing through the first opening includes: Using the handle, the material trough is pushed into the housing through the first opening along the target direction. The handle is located on the outer surface of the first wall, which is a side wall located on the same side of the reaction chamber as the first side wall.

24. The detection method according to any one of claims 20 to 23, characterized in that, The step of injecting the detection liquid into the material tank includes: The detection liquid in the storage tank is injected into the material placement tank, and the storage tank is used to store the detection liquid.

25. The detection method according to claim 24, characterized in that, The liquid storage tank is configured to enter the housing through a third opening and close the third opening, which is located on the second side wall or top wall of the housing.

26. The detection method according to claim 24 or 25, characterized in that, The step of injecting the detection liquid from the storage tank into the material placement tank includes: The detection liquid release mechanism is triggered to control the injection of the detection liquid in the storage tank into the material trough. The detection liquid release mechanism is located in the storage tank.

27. The detection method according to any one of claims 17 to 26, characterized in that, Before placing the detection solution and the electrode to be tested into the reaction chamber, the detection 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.

28. The detection method according to claim 27, characterized in that, The step of extracting target electrode components from the produced electrode components at a ratio of 1% to 10% includes: The target electrode assembly is extracted from the produced electrode assembly at a ratio of 1% to 5%.

29. The detection method according to any one of claims 17 to 28, characterized in that, The detection solution includes an acid solution.

30. The detection method according to any one of claims 17 to 29, characterized in that, The detection solution includes sulfuric acid solution, nitric acid solution, or hydrochloric acid solution.

Images