Gas taking device for gas production detection of battery

Abstract

The utility model discloses a gas taking device for battery gas production detection, which comprises a shell and a gas taking needle core, the shell is provided with a sliding through hole, the gas taking needle core is provided with a piercing part extending to the sliding through hole, the piercing part is installed in the sliding through hole in a sliding mode, and the sliding through hole is provided with a through hole. An elastic recovery piece is arranged between the gas taking needle core and the shell, and when the gas taking needle core slides, the elastic recovery piece elastically deforms, so that the piercing part extends out of the sliding through hole; and a sealing ring is arranged on the shell, is positioned on the periphery of the sliding through hole, and is used for abutting against a battery shell. The gas sampling device for gas production detection of the battery, provided by the utility model, is simple in structure and convenient to use, can avoid gas leakage and pollution in the gas sampling process through the arrangement of the sealing ring during puncture, is small in interference of external impurities, can accurately detect the components of produced gas, and is high in practicability. And thus, the accuracy and trueness of a gas production analysis result are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing equipment, in particular to a gas extraction device for detecting gas production of soft-pack batteries. Background Art

[0002] Lithium-ion batteries are widely used in electronic devices such as mobile phones and laptops due to their high energy density and environmental friendliness. In recent years, in response to environmental issues, gasoline price issues, and energy storage issues, the application of lithium-ion batteries has rapidly expanded to hybrid vehicles and energy storage systems. At the same time, higher requirements are placed on lithium-ion batteries, especially lifespan requirements (8 or 10 years) and power requirements. Lithium-ion battery positive electrode materials, especially lithium cobalt oxide and ternary nickel-cobalt-manganese positive electrode materials, are prone to gas production during cycling or storage, causing the current cut-off unit or explosion-proof valve of the hard-shell battery cell to flip prematurely, seriously affecting the service life of the lithium-ion battery. In order to reduce the gas production of lithium-ion batteries during cycling or storage, in-depth research on the gas production mechanism of lithium-ion batteries is needed.

[0003] Current research on gas production is primarily divided into in-situ and ex-situ analysis. The advantage of in-situ analysis lies in its real-time nature, enabling more accurate dynamic monitoring of battery gas production. However, this method requires specialized test cells, resulting in high costs and requiring high technical skills from the tester. While ex-situ analysis doesn't require specialized cells, the gas extraction process can easily lead to gas leakage and contamination, and also requires high technical skills from the tester.

[0004] Therefore, a solution is needed to solve the gas leakage and contamination problems during non-in-situ testing puncture, and it is also necessary to reduce the testing cost of in-situ testing. Utility Model Content

[0005] In order to solve the technical problems existing in the background technology, the utility model proposes a gas extraction device for battery gas production detection.

[0006] The utility model proposes a gas extraction device for battery gas production detection, comprising a shell and a gas extraction needle core. The gas extraction needle core is made of ceramic material, which is corrosion-resistant and can prevent short circuits caused by operational errors. A sliding through hole is opened on the shell, and the gas extraction needle core has a piercing portion extending to the sliding through hole. The piercing portion is slidably installed in the sliding through hole. An elastic recovery member is provided between the gas extraction needle core and the shell. When the gas extraction needle core slides, the elastic recovery member is elastically deformed, thereby causing the piercing portion to extend out of the sliding through hole.

[0007] The outer shell is provided with a sealing ring, which is located at the periphery of the sliding through hole and is used for contacting with the battery shell.

[0008] During operation, the sealing ring is first brought into contact with the battery shell, and then a downward force is applied to the air extraction needle core. At this time, the elastic reset part is deformed to allow the piercing part to extend out of the sliding hole and pierce the battery shell to extract air. In this process, the sealing ring acts to prevent gas leakage and gas pollution in the initial stage of air extraction. After the air extraction is completed, the downward force on the air extraction needle core is removed, and the air extraction needle core is driven back to its position under the action of the restoring force of the elastic part, and the end of the piercing part is moved into the sliding hole.

[0009] It should be noted that sealing glue can be pasted on the front end of the battery shell. The sealing glue is located inside the sealing ring and opposite to the air extraction needle core, and the thickness of the sealant is less than the thickness of the sealing ring. During the air extraction process, the piercing part first pierces the sealant and then pierces the battery shell to extract air, thereby further increasing the sealing effect.

[0010] It should be noted that the gas extraction needle core has a part located outside the shell, and the gas extraction needle core located in the battery shell part can be provided with a valve to control the opening and closing of the gas extraction.

[0011] Preferably, an elastic ring is provided on the sliding through hole, and the air extraction needle core is located in the elastic ring.

[0012] During the air extraction process, the elastic ring, the outer shell, the air extraction needle core, the sealing ring and the battery shell form a sealed cavity, and the friction force is increased by the sealing ring during the downward movement of the air extraction needle core, thereby increasing the downward force of the outer shell relative to the battery, thereby ensuring that the sealing ring is in a compressed state to ensure its sealing effect.

[0013] In some embodiments, preferably, a sliding groove is provided on the housing, and the air extraction needle core has a sliding connection portion, and the sliding connection portion slides in the sliding groove.

[0014] Furthermore, the position limit of the gas extraction needle core during the gas extraction process is increased. Of course, optionally, those skilled in the art can set a sliding column outside the gas extraction needle core and open a sliding hole on the outer shell to achieve the position limit of the gas extraction needle core sliding relative to the outer shell.

[0015] Preferably, the outer diameter of the sliding connection part is larger than the outer diameter of the piercing part, the sliding connection part has an outer connection part at one end away from the sliding through hole, the outer diameter of the outer connection part is smaller than the outer diameter of the sliding connection part, the outer connection part is slidably mounted on the outer shell and extends out of the outer shell, and the elastic recovery part is located in the sliding groove.

[0016] This further increases the position limit of the air extraction needle core during the sliding process, and facilitates the installation of the elastic recovery component. It should be noted that the shell can be formed by segmented rigid assembly.

[0017] Preferably, a limiting portion is provided in the sliding groove, and the limiting portion is used to limit the extreme position of the downward movement of the gas extraction needle core;

[0018] Avoid excessive downward movement of the air extraction needle core, which may affect the air extraction effect.

[0019] Preferably, the air extraction needle core can be rotated relative to the outer shell, the upper end of the elastic recovery part is connected to the sliding connection part of the air extraction needle core, and the lower end of the elastic recovery part is in conflict with or disengaged from the sliding groove; the limiting part includes a first limiting part and a second limiting part, and a protruding block is provided at the bottom of the air extraction needle core, and the air extraction needle core is rotated so that the protruding block is opposite to the first limiting part or the second limiting part.

[0020] The first limiting portion and the second limiting portion have different heights. Both the first limiting portion and the second limiting portion are located in the sliding groove. The air extraction needle core is rotated to limit the maximum downward displacement of the air extraction needle core.

[0021] Preferably, when the protruding block is opposite to the first limiting portion, the maximum downward displacement of the gas extraction needle core is 0, and the lower end of the gas extraction needle core is located in the sliding through hole;

[0022] When the protruding block is opposite to the second limiting portion, the maximum downward displacement of the air extraction needle core is the design value. At this time, downward pressure is applied to the air extraction needle core, the elastic recovery part is compressed, and the air extraction needle core moves downward to the maximum displacement. The lower end of the air extraction needle core extends out of the sliding through hole and extracts air from the battery.

[0023] Under the premise of limiting the displacement of the gas extraction needle core during the gas extraction process, the first limiting portion is provided to prevent the gas extraction needle core from being damaged by external force squeezing the gas extraction needle core when no gas is extracted.

[0024] Preferably, the gas extraction needle core has a second limiting surface, and when the second limiting portion contacts the protruding block, the second limiting surface contacts the first limiting portion.

[0025] The second limiting surface contacts the first limiting portion to further limit the vertical position of the gas extraction needle core. Preferably, the gas extraction needle core is provided with an indicator mark, and the housing has a first display and a second display; when the indicator mark points to the first display, the first limiting portion is opposite to the protruding block;

[0026] When the indicator mark points to the second display, the second limiting portion is opposite to the protruding block.

[0027] This makes it easier for the user to see which limiting portion the raised block of the air extraction needle core is opposite to, thereby facilitating the air extraction operation.

[0028] Preferably, the end of the piercing portion is Y-shaped or cross-shaped, which is beneficial to the smooth flow of air after puncture and avoids the generation of debris.

[0029] In the utility model, the gas extraction device proposed for battery gas production detection has a simple structure, is simple in structure and easy to use. It can avoid gas leakage and pollution during the gas extraction process through the setting of a sealing ring during puncture, has little interference from external impurities, and can accurately detect the composition of the gas production, thereby improving the accuracy and authenticity of the gas production analysis results; further, the puncture depth is limited by the set limit part to ensure safety and prevent misoperation; and its gas extraction needle core is always in the rear position, so the device can be used for non-in-situ gas extraction as well as in-situ gas detection, which provides technical personnel with operational convenience to a great extent and reduces the cost of use.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of the utility model;

[0032] Figure 2 This is a schematic structural diagram of another embodiment of the present utility model;

[0033] Figure 3 This is a schematic diagram of the relative structure of the protruding block and the first limiting portion of the utility model;

[0034] Figure 4 This is a schematic diagram of the structure of the raised block and the second limiting portion relative to each other in the present invention;

[0035] In the figure: 1. Shell; 10. Sliding through hole; 11. Sliding groove; 2. Air extraction needle core; 20. Piercing part; 21. Sliding connection part; 22. External connection part; 23. Second limiting surface; 3. Elastic recovery part; 4. Sealing ring; 5. Raised block; 6. First limiting part; 7. Second limiting part; 8. Elastic ring. DETAILED DESCRIPTION

[0036] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention, and should not be construed as limiting the present invention.

[0037] like Figure 1The gas extraction device shown in the figure is used for battery gas production detection, including a shell 1 and a gas extraction needle core 2. Like the existing gas extraction needle core 2, the gas extraction needle core 2 has a gas extraction channel. The gas extraction needle core 2 is made of ceramic material, which is corrosion-resistant and can prevent short circuits caused by operational errors. A sliding through hole 10 is opened on the shell 1. The gas extraction needle core 2 has a piercing portion 20 extending to the sliding through hole 10. The piercing portion 20 is slidably installed in the sliding through hole 10. An elastic recovery member 3 is provided between the gas extraction needle core 2 and the shell 1. The elastic recovery member 3 can be a spring in the prior art. The gas extraction needle core 2 slides downward to elastically deform the elastic recovery member 3, thereby causing the piercing portion 20 to extend out of the sliding through hole 10, thereby facilitating piercing the battery shell to extract gas.

[0038] The outer shell 1 is provided with a sealing ring 4 , which is located at the periphery of the sliding through hole 10 , and is used for contacting with the battery housing.

[0039] During operation, the sealing ring 4 is first brought into contact with the battery shell, and then a downward force is applied to the air extraction needle core 2. At this time, the elastic restoring member is deformed to allow the piercing portion 20 to extend out of the sliding hole 10 and pierce the battery shell to extract air. In this process, the sealing ring 4 acts to prevent gas leakage and gas pollution in the initial stage of air extraction. After the air extraction is completed, the downward force on the air extraction needle core 2 is removed, and the air extraction needle core 2 is driven back to its original position under the action of the restoring force of the elastic restoring member 3, and the end of the piercing portion 20 is moved into the sliding hole 10.

[0040] Optionally, a sealant can be adhered to the front end of the battery shell. The sealant is located inside the sealing ring 4 and opposite to the air extraction needle core 2, and the thickness of the sealant is less than the thickness of the sealing ring 4. During the air extraction process, the piercing part 20 first pierces the sealant and then pierces the battery shell to extract air, thereby further increasing the sealing effect.

[0041] It should be noted that the gas extraction needle core 2 has a portion located outside the shell 1, and the gas extraction needle core 2 located in the battery shell portion can be provided with a valve to control the opening and closing of the gas extraction device.

[0042] like Figure 1 As shown, in some embodiments, preferably, an elastic ring 8 is provided on the sliding hole 10, and the elastic ring 8 can be a rubber O-ring. The elastic ring 8 is fixed to the side wall of the sliding hole 10, and the elastic ring 8 is coaxial with the sliding hole 10. The air extraction needle core 2 is located in the elastic ring 8, and when the air extraction needle core 2 is placed in the elastic ring 8, the elastic ring 8 is in a compressed state.

[0043] During the air extraction process, the elastic ring 8, the outer shell 1, the air extraction needle core 2, the sealing ring 4 and the battery shell form a sealed cavity, and the friction force is increased by the sealing ring 4 during the downward movement of the air extraction needle core 2, thereby increasing the downward force of the outer shell 1 relative to the battery, thereby ensuring that the sealing ring 4 is in a compressed state to ensure its sealing effect.

[0044] like Figure 1 As shown, in some embodiments, preferably, a sliding groove 11 is opened on the housing 1, the sliding through hole 10 is opened in the sliding groove 11, the air extraction needle core 2 has a sliding connection part 21, the sliding connection part 21 is located above the piercing part 20, and the sliding connection part 21 is located in the sliding groove and slides, so that the air extraction needle core 2 is limited in the process of extracting air.

[0045] In some embodiments, preferably, the outer diameter of the sliding connection part 21 is larger than the outer diameter of the piercing part 20, and the sliding connection part 21 has an outer connection part 22 at the end away from the sliding through hole 10, and the outer diameter of the outer connection part 22 is smaller than the outer diameter of the sliding connection part 21. The outer connection part 22 is slidably installed on the outer shell 1 and extends out of the outer shell 1. The elastic recovery part 3 is located in the sliding groove 11, further increasing the limit of the air extraction needle core 2 during the sliding process, and facilitating the installation of the elastic recovery part 3; it should be noted that the outer shell 1 can be formed by a segmented rigid assembly.

[0046] like Figure 1 As shown, preferably, a limiting portion is provided in the sliding groove 11, and the limiting portion is used to limit the extreme position of the downward movement of the gas extraction needle core 2;

[0047] Avoid the air extraction needle core 2 from moving too far downward, thereby affecting the air extraction effect.

[0048] like Figure 1 As shown, the limiting portion and the elastic recovery member 3 are both located in the sliding groove 11, and the elastic recovery member 3 can be provided as multiple groups distributed around the periphery of the piercing portion 20 of the gas extraction needle core 2, and the limiting portion is located around the periphery of the piercing portion 20. Figure 1 The limiting portion is closer to the piercing portion 20 relative to the elastic recovery member 3. In some embodiments, Figure 2 As shown, the elastic recovery member 3 is close to the piercing portion 20 relative to the limiting portion.

[0049] like Figure 3 or Figure 4 As shown, in some embodiments, preferably, the gas extraction needle core 2 can rotate relative to the housing 1, the upper end of the elastic recovery member is connected to the sliding connection portion 21 of the gas extraction needle core 2, and the lower end of the elastic recovery member 3 is not fixedly connected to the sliding groove 11, and the lower end of the elastic recovery member 3 conflicts with the sliding groove 11;

[0050] The limiting part includes a first limiting part 6 and a second limiting part 7. A protruding block 5 is provided at the bottom of the gas needle core 2. The gas needle core 2 is rotated so that the protruding block 5 is opposite to the first limiting part 6 or the second limiting part 7. The first limiting part 6 and the second limiting part 7 have different heights. The first limiting part 6 and the second limiting part 7 are both located in the sliding groove 11. The gas needle core 2 is rotated to limit the maximum displacement of the gas needle core 2 moving downward.

[0051] Preferably, when the protruding block 5 is opposite to the first limiting portion, the maximum downward displacement of the gas extraction needle core 2 is 0, and the lower end of the gas extraction needle core 2 is constantly located in the sliding through hole 10. Figure 3 It is a schematic diagram of the structure in which the protruding block 5 and the first limiting portion 6 are relative to each other;

[0052] Figure 4 This is a structural diagram of the protruding block 5 and the second limiting portion 7 relative to each other. When the protruding block 5 is relative to the second limiting portion 7, if downward pressure is applied to the gas extraction needle core 2, the elastic recovery member 3 is in a compressed state, and the lower end of the gas extraction needle core 2 extends out of the sliding through hole 10 to extract gas from the battery. Under the premise of limiting the displacement of the gas extraction needle core 2 during the gas extraction process, the provision of the first limiting portion 6 prevents the gas extraction needle core 2 from being squeezed by external force and damaged by the end of the gas extraction needle core 2 when no gas is extracted;

[0053] During use, if acupuncture is not required, the elastic recovery member 3 drives the gas extraction needle core 2 to slide upward and the acupuncture end of the acupuncture part is located in the sliding through hole 10. At this time, the raised block 5 of the gas extraction needle core 2 is opposite to the first limiting portion 6. Figure 3 As shown, at this time, even if the air extraction needle core 2 is accidentally touched, the puncture end will not move out of the sliding hole 10; when air extraction is needed, the air extraction needle core 2 is rotated so that the raised block 5 of the air extraction needle core 2 is opposite to the first limiting portion 6, and then a downward force is applied to the air extraction needle core 2 to squeeze the elastic recovery part 3, so that the puncture end of the puncture part slides out of the sliding hole 10 and punctures the battery shell to extract air, and the displacement limit of the air extraction needle core 2 is achieved when the second limiting portion 7 conflicts with the raised block 5.

[0054] like Figure 4 As shown, preferably, the gas extraction needle core 2 has a second limiting surface 23 , and when the second limiting portion 7 contacts the protruding block 5 , the second limiting surface 23 contacts the first limiting portion 6 .

[0055] The second limiting surface 23 contacts the first limiting portion 6 to further limit the vertical position of the gas extraction needle core 2 .

[0056] In some embodiments, preferably, the air extraction needle core 2 is provided with an indicator mark (not shown in the figure), and the housing 1 has a first display and a second display (not shown in the figure). This structure is similar to the switch of an electric fan to rotate the air extraction needle;

[0057] When the indicator mark points to the first display, the first limiting portion 6 contacts the raised block 5;

[0058] When the indication mark points to the second display, the second limiting portion 7 contacts the protruding block 5 .

[0059] This makes it easier for the user to observe which limiting portion the raised block 5 of the air extraction needle core 2 is facing, thereby facilitating the air extraction operation.

[0060] In some embodiments, the end of the piercing portion 20 is preferably Y-shaped or cross-shaped, which is beneficial for smooth air flow after puncture and avoids the generation of debris.

[0061] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0062] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0063] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0064] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0065] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gas extraction device for battery gas production detection, comprising a housing (1) and a gas extraction needle core (2), characterized in that: The housing (1) is provided with a sliding through hole (10), the gas extraction needle core (2) has a piercing portion (20) extending to the sliding through hole (10), the piercing portion (20) is slidably installed in the sliding through hole (10), an elastic recovery member (3) is provided between the gas extraction needle core (2) and the housing (1), and when the gas extraction needle core (2) is slid, the elastic recovery member (3) is elastically deformed, thereby causing the piercing portion (20) to extend out of the sliding through hole (10); A sealing ring (4) is provided on the housing (1), and the sealing ring (4) is located on the outer periphery of the sliding through hole (10). The sealing ring (4) is used to contact the battery housing.

2. The gas extraction device for battery gas production detection according to claim 1, characterized in that: An elastic ring (8) is provided on the sliding through hole (10), and the air extraction needle core (2) is located inside the elastic ring (8).

3. The gas extraction device for battery gas production detection according to claim 1, characterized in that: The housing (1) is provided with a sliding groove (11), and the air extraction needle core (2) has a sliding connection portion (21), and the sliding connection portion (21) is located and slides in the sliding groove.

4. The gas extraction device for battery gas production detection according to claim 3, characterized in that: The outer diameter of the sliding connection part (21) is larger than the outer diameter of the piercing part (20), and the end of the sliding connection part (21) away from the sliding through hole (10) has an outer connection part (22), the outer diameter of the outer connection part (22) is smaller than the outer diameter of the sliding connection part (21), and the outer connection part (22) is slidably mounted on the shell (1) and extends out of the shell (1), and the elastic recovery member (3) is located in the sliding groove (11).

5. The gas extraction device for battery gas production detection according to claim 3, characterized in that: A limiting portion is provided in the sliding groove (11), and the limiting portion is used to limit the downward movement of the gas extraction needle core (2).

6. The gas extraction device for battery gas production detection according to claim 5, characterized in that: The air extraction needle core (2) can rotate relative to the housing (1), the upper end of the elastic recovery member (3) is connected to the sliding connection portion (21) of the air extraction needle core (2), and the lower end of the elastic recovery member (3) is in contact with the sliding groove (11); The limiting portion comprises a first limiting portion (6) and a second limiting portion (7); a protruding block (5) is provided at the bottom of the gas extraction needle core (2); and the gas extraction needle core (2) is rotated so that the protruding block (5) is opposite to the first limiting portion (6) or the second limiting portion (7).

7. The gas extraction device for battery gas production detection according to claim 6, characterized in that: When the protruding block (5) is opposite to the first limiting portion (6), when the outside world applies a downward pressure on the gas extraction needle core (2), the protruding block (5) contacts the first limiting portion (6), and the lower end of the gas extraction needle core (2) is still located in the sliding through hole (10); When the protruding block (5) is opposite to the second limiting portion (7), and external pressure is applied to the air extraction needle core (2), the elastic recovery member (3) is in a compressed state, the air extraction needle core (2) moves a limited distance, and the sliding through hole (10) extends from the lower end to pierce the battery shell to extract air from the battery.

8. The gas extraction device for battery gas production detection according to claim 7, characterized in that: The gas extraction needle core (2) has a second limiting surface (23), and when the second limiting portion (7) contacts the protruding block (5), the second limiting surface (23) contacts the first limiting portion (6).

9. The gas extraction device for battery gas production detection according to claim 6, characterized in that: The air extraction needle core (2) is provided with an indicator mark on the outside, and the housing (1) has a first display and a second display; When the indicator mark points to the first display, the first limiting portion (6) is opposite to the protruding block (5); When the indication mark points to the second display, the second limiting portion (7) is opposite to the raised block (5).

10. The gas extraction device for battery gas production detection according to claim 1, characterized in that: The end of the piercing portion (20) is in a Y-shape or a cross-shape.

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