Detection device for internal wettability of battery and battery

Abstract

The utility model discloses a battery internal wettability detection device and a battery. According to the detection device for the internal wettability of the battery, the battery is provided with a sealing bag, the sealing bag is internally provided with a sealing space, the sealing space is used for accommodating a battery cell and electrolyte, the battery cell is partially soaked in the electrolyte, and the detection device comprises an extraction pipeline and an air extraction piece. One end of the extraction pipeline is arranged in the sealed space and is inserted into the battery cell, and the joint of the extraction pipeline and the battery cell is positioned above the electrolyte. The air exhaust part is arranged outside the sealing bag and connected with the other end of the extraction pipeline. According to the detection device, the infiltration condition of the electrolyte can be detected without disassembling the battery cell, so that the waste of the battery cell is reduced, and the material cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of battery equipment, and in particular to a device for detecting the internal wettability of a battery and a battery. Background Technology

[0002] In the production of pouch lithium-ion batteries, cell activation time has always been a major factor restricting production efficiency. Currently, the larger the cell capacity required, the larger the cell size and thickness become, making cell wetting issues particularly prominent. The electrolyte enters the cell from the outside in, and the inner part of the cell is often the most difficult area to wet. To observe whether the cell is thoroughly wetted, a tool is needed for inspection, and the cell needs to be disassembled to observe the electrode wetting, thus wasting a large number of cells and increasing material costs. Utility Model Content

[0003] The main purpose of this utility model is to provide a battery internal wettability detection device and battery, aiming to solve the technical problem in related technologies that require disassembling the battery cell to observe the wettability of the electrode sheets, thereby wasting a large number of battery cells and increasing material costs.

[0004] To achieve the above-mentioned utility model objectives, the first aspect of this utility model proposes a device for detecting the internal wettability of a battery.

[0005] A device for detecting the internal wettability of a battery, wherein the battery is provided with a sealed bag, the sealed bag having a sealed space for accommodating a battery cell and an electrolyte, the battery cell being partially immersed in the electrolyte, comprising:

[0006] An extraction pipe, one end of which is disposed within the sealed space and inserted into the interior of the battery cell, wherein the connection between the extraction pipe and the battery cell is located above the electrolyte; and

[0007] An air extraction device is disposed outside the sealed bag and connected to the other end of the extraction pipe.

[0008] In one embodiment, the extraction conduit includes a first flexible tube and a rigid tube. The first flexible tube is disposed within the sealed space, with one end inserted into the interior of the battery cell and the other end connected to the rigid tube. The rigid tube extends partially out of the sealed bag.

[0009] In one embodiment, the extraction conduit includes a second flexible tube disposed outside the sealed bag, one end of the second flexible tube being connected to the end of the rigid tube away from the first flexible tube, and the other end of the second flexible tube being connected to the air extraction component.

[0010] In one embodiment, the melting point of the rigid tube is higher than that of the first flexible tube; and / or

[0011] The melting point of the rigid tube is higher than that of the second flexible tube.

[0012] In one embodiment, the detection device further includes a needle connected to one end of the first flexible tube and inserted into the interior of the battery cell.

[0013] In one embodiment, the needle is inserted into the cell for a length greater than half the thickness of the cell.

[0014] In one embodiment, the detection device further includes a shut-off element disposed on the extraction pipe and outside the sealed bag, the shut-off element being used to stop the flow of gas or liquid within the extraction pipe.

[0015] The second aspect of this utility model provides a battery, including a battery cell, wherein the aforementioned detection device is used to detect the wettability inside the battery, and an insertion hole is provided on the side of the battery cell, and one end of a extraction tube is inserted into the insertion hole.

[0016] In one embodiment, multiple insertion holes, multiple extraction pipes, and multiple extraction components are provided, with each extraction pipe corresponding to one of the multiple insertion holes and multiple extraction components.

[0017] In one embodiment, along the length of the battery cell, the ratio of the spacing between every two adjacent insertion holes to the length of the battery cell is 1 / 5 to 1 / 3; and / or

[0018] Along the width direction of the battery cell, the ratio of the distance between any two adjacent insertion holes to the width of the battery cell is 1 / 5 to 1 / 3.

[0019] Beneficial effects:

[0020] This utility model discloses a battery internal wettability testing device, comprising a sealed bag, an extraction pipe, and an extraction component. The sealed bag contains a sealed space for accommodating a battery cell and electrolyte, with the battery cell partially immersed in the electrolyte. One end of the extraction pipe is positioned within the sealed space and inserted into the battery cell, with the contact point between the extraction pipe end and the battery cell located above the electrolyte. The extraction component is positioned outside the sealed bag and connected to the other end of the extraction pipe.

[0021] During operation, the battery cell is partially immersed in the electrolyte, allowing the internal electrodes to slowly absorb it. One end of the extraction pipe connects to the battery cell above the electrolyte; that is, this connection point is not submerged. As the internal electrodes absorb the electrolyte, the level of electrolyte immersion inside the cell rises. When the electrolyte level reaches the connection point of the extraction pipe, a suction device extracts the electrolyte from the sealed bag, thus detecting the electrolyte level inside the cell. This detection device can assess electrolyte immersion without disassembling the battery cell, reducing cell waste and material costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a battery internal wettability detection device in one embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the battery cell structure in one embodiment of this utility model.

[0024] Figure 3 This is a schematic diagram of the detection device and the battery cell in one embodiment of this utility model.

[0025] Figure 4 This is an analytical diagram showing the Li element content of the electrolyte at different locations in one embodiment of this utility model.

[0026] in:

[0027] 100. Sealed bag; 110. Electrolyte;

[0028] 200. Extraction pipe; 210. First flexible hose; 220. Rigid pipe; 230. Second flexible hose;

[0029] 300. Exhaust components;

[0030] 400. Needle;

[0031] 500, Deadline Item;

[0032] 600, battery cell; 610, insertion hole.

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.

[0036] In the description of this utility model, it should be noted 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 mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] like Figures 1 to 3As shown, in some embodiments, a battery internal wettability detection device includes an extraction pipe 200 and a vacuum component 300. The battery is provided with a sealed bag 100. The sealed bag 100 has a sealed space for accommodating a battery cell 600 and an electrolyte 110, with the battery cell 600 partially immersed in the electrolyte 110. One end of the extraction pipe 200 is disposed within the sealed space and inserted into the interior of the battery cell 600, with the connection point between the extraction pipe 200 and the battery cell 600 located above the electrolyte 110. The vacuum component 300 is disposed outside the sealed bag 100 and connected to the other end of the extraction pipe 200.

[0039] During operation, the battery cell 600 is partially immersed in the electrolyte 110, allowing the electrodes inside the cell 600 to slowly absorb the electrolyte 110. One end of the extraction pipe 200 is connected to the battery cell 600 above the electrolyte 110. That is, the connection point between the extraction pipe 200 and the battery cell 600 is not immersed in the electrolyte 110. As the electrodes inside the battery cell 600 continuously absorb the electrolyte 110, the height of the electrolyte 110 inside the battery cell 600 increases. When the height of the electrolyte 110 inside the battery cell 600 reaches the connection point between the extraction pipe 200 and the battery cell 600, the vacuum unit 300 can extract the electrolyte 110 from the outside of the sealed bag 100, thereby detecting the height of the electrolyte 110 inside the battery cell 600. This testing device can detect the wetting status of electrolyte 110 without disassembling the battery cell 600, reducing waste of battery cell 600 and lowering material costs.

[0040] Specifically, the sealed bag 100 can be an aluminum-plastic bag.

[0041] In some embodiments, the extraction conduit 200 includes a first flexible tube 210 and a rigid tube 220. The first flexible tube 210 is disposed within a sealed space, with one end inserted into the interior of the battery cell 600 and the other end connected to the rigid tube 220. The rigid tube 220 partially extends out of the sealed bag 100. The first flexible tube 210 is flexible, allowing it to better adapt to the shape and position of the battery cell 600 and facilitating insertion into the battery cell 600. Specifically, the first flexible tube 210 can be a plastic flexible tube. Specifically, the rigid tube 220 can be a metal tube. Specifically, the diameter of the first flexible tube 210 can be 0.2~0.4 mm. Specifically, the diameter of the rigid tube 220 can be 0.2~0.4 mm.

[0042] The rigid tube 220 extends beyond the sealed bag 100. That is, the rigid tube 220 has a sealing connection point with the sealed bag 100. The rigid tube 220 provides good support and stability, and its partial extension beyond the sealed bag 100 facilitates a sealing connection with it.

[0043] In some embodiments, the extraction conduit 200 includes a second flexible tube 230 disposed outside the sealed bag 100. One end of the second flexible tube 230 is connected to the end of the rigid tube 220 away from the first flexible tube 210, and the other end of the second flexible tube 230 is connected to the suction device 300. The second flexible tube 230 is flexible, enabling a reliable connection between the suction device 300 and the rigid tube 220. The connection of one end of the second flexible tube 230 to the rigid tube 220 and the other end to the suction device 300 forms a complete gas extraction channel. When the suction device 300 operates, it generates negative pressure. If the portion of the first flexible tube 210 inserted into the battery cell 600 is not wetted with the electrolyte 110, the suction device 300 cannot extract the electrolyte 110. If the portion of the first flexible tube 210 inserted into the battery cell 600 is wetted with the electrolyte 110, the suction device 300 can extract the electrolyte 110, thereby determining the wettability inside the battery cell 600.

[0044] Specifically, the second hose 230 can be a plastic hose.

[0045] In some embodiments, the melting point of the rigid tube 220 is higher than that of the first flexible tube 210. The melting point of the rigid tube 220 is higher than that of the second flexible tube 230.

[0046] It should be noted that when the connection between the rigid tube 220 and the aluminum-plastic bag is heat-treated to achieve a seal, the rigid tube 220 will not soften or melt excessively due to heat, thus maintaining its structural strength and shape stability. The material used for the sealing connection becomes liquid when it reaches its melting temperature, filling the gap between the rigid tube 220 and the aluminum-plastic bag. After cooling, it solidifies to form a sealed structure, preventing leakage of gas and electrolyte 110 and ensuring the airtightness of the sealed bag 100.

[0047] In some embodiments, the detection device further includes a needle 400, which is connected to one end of a first flexible tube 210 and inserted into the interior of the battery cell 600. The needle 400 can easily penetrate the battery cell 600 and communicate with the electrode plates inside the battery cell 600, thereby establishing a channel between the electrode plates inside the battery cell 600 and the external detection device. The first flexible tube 210 is connected to the needle 400. When the vacuum device 300 operates and generates negative pressure, the electrolyte 110 that may be present in the electrode plates inside the battery cell 600 can enter the first flexible tube 210 through the needle 400, and then be extracted along the rigid tube 220 and the second flexible tube 230. The wetting condition inside the battery cell 600 is determined by observing the state of the extracted electrolyte 110.

[0048] Specifically, the needle 400 is inserted into the cell 600 for a length greater than half the thickness of the cell 600. The electrolyte 110 wets the cell 600 from the outside in, with the innermost part of the cell being the most difficult to wet. Inserting the needle 400 for a length greater than half the thickness of the cell 600 allows it to approach the more difficult-to-wet areas. When using the suction device 300 for evacuation, if the cell 600 is already wetted, the electrolyte 110 in that area is more easily passed through the needle 400 into the extraction channel 200, thus more accurately reflecting the true wettability inside the cell 600.

[0049] In some embodiments, the detection device further includes a shut-off element 500, which is disposed on the extraction pipe 200 and outside the sealed bag 100. The shut-off element 500 is used to stop the flow of gas or liquid in the extraction pipe 200.

[0050] It should be noted that the flow of gas or liquid within the extraction pipeline 200 is controlled by controlling the on / off state of the shut-off element 500. When the shut-off element 500 is closed, it blocks the passage of the extraction pipeline 200, preventing gas and liquid from flowing within the pipeline. When the shut-off element 500 is opened, the pipeline is reopened, allowing gas or liquid to flow normally. During the testing process, precise control of the extraction process is achieved by operating the shut-off element 500 at appropriate times to meet the needs of different testing stages. For example, when preparing for gas extraction testing, the shut-off element 500 is opened, and the gas extraction unit 300 is started for gas extraction. After a certain amount of electrolyte 110 has been extracted, and observation or analysis is required, the shut-off element 500 is closed to stop the extraction of electrolyte 110, facilitating observation and testing by operators, such as determining the amount of electrolyte 110 extracted, performing elemental analysis on the extracted electrolyte 110, etc., thereby achieving precise control of the testing process.

[0051] Specifically, the shut-off element 500 can be provided on the second hose 230. The shut-off element 500 can be a clamp. When it is necessary to stop the flow of the second hose 230, the operator applies external force to clamp the second hose 230, and by squeezing the wall of the second hose 230, the internal channel of the second hose 230 is sealed, thereby preventing the electrolyte 110 from flowing in the second hose 230.

[0052] In another embodiment, a battery includes a cell 600. This battery can be an energy storage device composed of multiple cells. The battery has a certain voltage, capacity, and energy output capability, and can serve as an independent power source to provide power to various devices or systems. The cell can be the basic building block of the battery. The cell can consist of a positive electrode, a negative electrode, a separator, and an electrolyte, and can store and release electrical energy through chemical reactions. Multiple cells can be combined together and connected in series, parallel, or mixed configurations to form a battery with specific voltage, capacity, and performance requirements.

[0053] The aforementioned testing device is used to test the wettability inside the battery. An insertion hole 610 is provided on the side of the battery cell 600, and one end of the extraction tube 200 is inserted into the insertion hole 610. Specifically, the diameter of the insertion hole 610 can be 0.2~0.4 mm.

[0054] Specifically, multiple insertion holes 610, extraction pipes 200, and air extraction components 300 are provided, with each extraction pipe 200 corresponding to one of the multiple insertion holes 610 and the multiple air extraction components 300. This arrangement allows for the simultaneous acquisition of internal information from multiple locations within the battery cell 600, thus providing a more comprehensive understanding of the wetting conditions inside the battery cell 600.

[0055] Specifically, along the length of the battery cell 600, the ratio of the spacing between any two adjacent insertion holes 610 to the length of the battery cell 600 is 1 / 5 to 1 / 3. Along the width of the battery cell 600, the ratio of the spacing between any two adjacent insertion holes 610 to the width of the battery cell 600 is also 1 / 5 to 1 / 3. By controlling the spacing between any two adjacent insertion holes 610 to the length or width of the battery cell 600 within a certain ratio range in both the length and width directions, uniform sampling within the battery cell 600 can be achieved. This arrangement ensures that the insertion holes 610 are distributed on the surface of the battery cell 600 at relatively fixed intervals, guaranteeing uniform detection points throughout the battery cell 600.

[0056] During testing, the time after electrolyte 110 is injected is first recorded. Electrolyte 110 is then extracted using the vacuum extractor 300 at preset time intervals. When electrolyte 110 reaches the insertion port, it can be extracted. As the immersion time increases, electrolyte 110 can be extracted from different insertion ports, indicating the immersion position of electrolyte 110. The immersion curve of the battery cell 600 can be simulated by measuring time and distance. Elemental analysis of the electrolyte 110 extracted from different insertion ports is then performed. The elemental composition can further verify the consistency of electrode immersion within the battery cell 600.

[0057] like Figure 4 As shown, electrolyte 110 is extracted through nine insertion holes 610, and elemental analysis is performed on the extracted electrolyte 110. Figure 2 The Li element distribution in the electrolyte 110 located on the left and right sides is higher than that in the electrolyte 110 located in the middle (Li element distribution of the two samples tested in the figure), indicating poor internal wetting consistency of the battery cell 600.

[0058] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A device for detecting the internal wettability of a battery, wherein the battery is provided with a sealed bag, the sealed bag having a sealed space for accommodating a battery cell and an electrolyte, the battery cell being partially immersed in the electrolyte, characterized in that... include: An extraction pipe is provided, one end of which is disposed within the sealed space and inserted into the interior of the battery cell. The connection between the extraction pipe and the battery cell is located above the electrolyte. and An air extraction device is disposed outside the sealed bag and connected to the other end of the extraction pipe.

2. The detection device according to claim 1, characterized in that, The extraction conduit includes a first flexible tube and a rigid tube. The first flexible tube is disposed within the sealed space. One end of the first flexible tube is inserted into the interior of the battery cell, and the other end is connected to the rigid tube. The rigid tube extends partially out of the sealed bag.

3. The detection device according to claim 2, characterized in that, The extraction pipe includes a second hose, which is disposed outside the sealed bag. One end of the second hose is connected to the end of the rigid tube away from the first hose, and the other end of the second hose is connected to the air extraction component.

4. The detection device according to claim 3, characterized in that, The rigid tube has a higher melting point than the first flexible tube; and / or The melting point of the rigid tube is higher than that of the second flexible tube.

5. The detection device according to claim 2, characterized in that, The detection device also includes a needle, which is connected to one end of the first flexible tube and inserted into the inside of the battery cell.

6. The detection device according to claim 5, characterized in that, The length of the needle inserted into the battery cell is greater than half the thickness of the battery cell.

7. The detection device according to claim 1, characterized in that, The detection device further includes a shut-off element, which is disposed on the extraction pipe and outside the sealed bag. The shut-off element is used to stop the flow of gas or liquid in the extraction pipe.

8. A battery, comprising a cell, characterized in that, The detection device according to any one of claims 1 to 7 is used to detect the wettability inside the battery, wherein an insertion hole is provided on the side of the battery cell, and one end of the extraction tube is inserted into the insertion hole.

9. The battery according to claim 8, characterized in that, The insertion hole, the extraction pipe, and the air extraction component are all provided in multiples, and the multiple extraction pipes are respectively provided in one-to-one correspondence with the multiple insertion holes and the multiple air extraction components.

10. The battery according to claim 8, characterized in that, Along the length of the battery cell, the ratio of the distance between any two adjacent insertion holes to the length of the battery cell is 1 / 5 to 1 / 3; and / or Along the width direction of the battery cell, the ratio of the distance between any two adjacent insertion holes to the width of the battery cell is 1 / 5 to 1 / 3.

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