Battery cell test gas collector
By designing a battery cell test gas collector, using the filling block to occupy the tank space to reduce the nitrogen charge, and detecting gas parameters through the pressure measurement structure and temperature sensor, the problems of detection accuracy and gas purity in the existing gas collector device are solved, and high-precision battery cell failure gas detection is achieved.
Patent Information
- Application Number
- CN202421407651.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-06-19
AI Technical Summary
The existing gas collecting device needs to be filled with a large amount of nitrogen during failure testing, which affects the detection accuracy of temperature, pressure and other parameters, and cannot guarantee the purity of gas collection.
A battery-cell test gas collection tank is designed, including a tank body, a lid body, a filling block, a pressure measuring structure and a temperature sensor. A sealing chamber is formed through the pick-and-drop port on the tank body and the gas interface. The filling block occupies the internal space of the tank body, reduces the amount of nitrogen filling, and detects the gas pressure and temperature through the pressure measuring structure and a temperature sensor to ensure the purity of gas collection.
The impact of large amount of nitrogen on detection accuracy is avoided, the purity of gas collection is ensured, and high-precision detection of cell failure gas is achieved.
Smart Images
Figure CN223064869U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery cell testing, in particular to a gas collecting tank for battery cell testing. Background Art
[0002] With the rapid development of new energy technologies, the quality and safety requirements for battery cells are getting higher and higher. The detection of the failure gas of battery cells is one of the important test items.
[0003] At present, a gas collecting device is used to collect the gas released after the failure of the battery cell and detect and analyze the failure gas of the battery cell. In order to adapt to battery cells of different volumes and ensure safety during failure explosion, the existing battery cell gas collecting device is usually designed to have a large volume. Before the failure test, nitrogen needs to be filled into the device to avoid the influence of internal air on the purity of gas collection.
[0004] However, during the failure test of the existing gas collecting device, a large volume of nitrogen needs to be filled. A large amount of nitrogen easily affects the detection accuracy of various parameters such as temperature and pressure, and at the same time, the purity of gas collection cannot be guaranteed. Summary of the Utility Model
[0005] The technical problem to be solved by the utility model is that during the failure test of the existing gas collecting device, a large volume of nitrogen needs to be filled. A large amount of nitrogen easily affects the detection accuracy of various parameters such as temperature and pressure, and at the same time, the purity of gas collection cannot be guaranteed.
[0006] To solve the above technical problem, the utility model provides a technical solution for a gas collecting tank for battery cell testing:
[0007] The gas collecting tank for battery cell testing includes:
[0008] A tank body, on which a placement and extraction opening and a gas interface are provided. A cover body is connected to the placement and extraction opening, and the cover body is sealingly matched with the placement and extraction opening to form a sealed cavity inside the tank body. The gas interface is communicated with the sealed cavity;
[0009] Filling blocks, which are stacked and arranged in the sealed cavity. The outer surface of the filling block is a gas isolation surface. A test space for placing the battery cell is also provided between the tank body and the filling blocks;
[0010] A pressure measuring structure, a pressure measuring port is provided on the tank body, and the pressure measuring structure is installed at the pressure measuring port for detecting the gas pressure inside the sealed cavity;
[0011] A temperature sensor, a temperature measuring port is further provided on the tank body or the cover body, and the temperature sensor is installed at the temperature measuring port for detecting the gas temperature in the sealed cavity.
[0012] Further, there are at least two of the filling blocks, and a fitting portion is provided on the outer side of the filling block, and the fitting portions of two adjacent filling blocks are in concave-convex fit.
[0013] Further, the contour shape of the sealing cavity is cylindrical, the shape of the filling block is prismatic, and the length direction of the filling block extends parallel to the axis direction of the tank body.
[0014] Further, the filling block has a splicing side surface, the fitting portion is arranged on the splicing side surface, and the fitting portion is a convex rib or a groove extending along the length direction of the filling block.
[0015] Further, the filling block also has an arc-shaped side surface, and the arc-shaped side surface is in fit with the inner wall of the tank body.
[0016] Further, the filling block is a hollow block body, the filling block is formed by sealing and welding a plurality of steel plates, and the surface of the steel plate constitutes the gas isolation surface.
[0017] Further, the pressure measuring structure includes a cylinder body, a piston rod, a pressure sensor and a fixing bracket. The cylinder body is fixedly connected to the pressure measuring port, the piston rod is slidably and sealingly installed in the cylinder body, the fixing bracket is installed on the outer side of the tank body, the pressure sensor is arranged on the fixing bracket and the pressure sensor is connected to the piston rod.
[0018] Further, a plurality of gas interfaces are provided, including a vacuum pumping interface, a nitrogen filling interface and a gas collecting interface.
[0019] Further, a heating sheet is also provided in the test space, and the heating sheet has a heat-conducting surface for contact and fit with the battery cell.
[0020] Further, two access openings are provided on the tank body, and two cover bodies are provided. One of the cover bodies is hingedly installed at one of the access openings, and the other cover body is fixedly installed at the other access opening by bolts.
[0021] Compared with the prior art, a gas collecting tank for testing battery cells of the present utility model has the following beneficial effects: The gas collecting tank for testing battery cells adopts a design form including a tank body, a cover body, filling blocks, a pressure measuring structure, and a temperature sensor. A placement opening and a gas interface are provided on the tank body. The cover body is connected to the placement opening of the tank body, and the gas interface communicates with a sealing cavity. When the cover body is closed, the cover body is in sealing cooperation with the placement opening, thereby forming a sealing cavity inside the tank body to ensure that the high temperature and harmful gases generated by the failure of the battery cell are accumulated in the sealing cavity. The air in the sealing cavity can be pumped out through the gas interface, and an inert gas with a corresponding volume can be filled to make the pressure in the sealing cavity reach the set test air pressure. The harmful gases released by the failure of the battery cell can also be collected through the gas interface for subsequent detection of the gas components.
[0022] Among them, the filling blocks are stacked and arranged in the sealing cavity, and there is also a test space between the tank body and the filling blocks. That is to say, stacking and arranging the filling blocks in the sealing cavity can effectively occupy the internal space of the tank body, reducing the volume of nitrogen gas filled into the tank body subsequently. Moreover, a test space is reserved in the sealing cavity to ensure that the battery cell can be smoothly placed in the space other than that occupied by the filling blocks. In addition, the outer surface of the filling block is a gas isolation surface, which can prevent the gas released by the failure of the battery cell from possibly infiltrating into the filling blocks, ensuring that the gas can only be accumulated in the space outside the filling blocks. In addition, a pressure measuring port is provided on the tank body, the pressure measuring structure is installed at the pressure measuring port, and a temperature measuring port is also provided on the tank body or the cover body, and the temperature sensor is installed at the temperature measuring port.
[0023] During the test, according to the shape and size of the sealing cavity and the battery cell, select filling blocks to stack in the tank body and reserve a test space for placing the battery cell. After placing the battery cell, close the cover body; pump out the air through the gas interface and then fill in an inert gas with a corresponding volume to trigger the failure of the battery cell; the pressure measuring structure can be used to detect the gas pressure inside the sealing cavity, the temperature sensor can detect the gas temperature in the sealing cavity in real time, and the harmful gases released by the failure of the battery cell can also be collected through the gas interface. Compared with the existing gas collecting device, this gas collecting tank for testing battery cells not only avoids affecting the detection accuracy of various parameters such as temperature and pressure due to a large amount of nitrogen gas, but also ensures the purity of gas collection. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 is a three-dimensional schematic diagram of the gas collecting tank for testing battery cells in an embodiment of the present utility model;
[0025] Figure 2 is a top view schematic diagram of the gas collecting tank for testing battery cells in an embodiment of the present utility model;
[0026] Figure 3 is Figure 2 a cross-sectional schematic diagram of the gas collecting tank for testing battery cells at A-A in
[0027] Figure 4It is a partial schematic view of the cell test gas collection tank in other embodiments of the present utility model;
[0028] In the figure: 1 - tank body, 10 - sealing cavity, 11 - access opening, 12 - gas interface, 121 - vacuum pumping interface, 122 - nitrogen filling interface, 123 - gas collection interface, 13 - pressure measuring port, 14 - test space, 2 - cover body, 20 - temperature measuring port, 3 - filling block, 30 - fitting part, 31 - splicing side surface, 32 - arc-shaped side surface, 3a - filling block at the bottom, 3b - filling block on the side, 4 - cell, 5 - pressure measuring structure, 50 - cylinder body, 51 - piston rod, 52 - pressure sensor, 53 - fixing bracket, 54 - sealing ring, 6 - heating sheet. Specific embodiments
[0029] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.
[0030] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. in the present utility model is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.
[0031] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.
[0032] In the present utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0033] Such as Figures 1 to 3As shown in the figure, a gas collecting tank for testing an electric core according to an embodiment of the present utility model includes a tank body 1, a cover body 2, a filling block 3, a pressure measuring structure 5 and a temperature sensor. A placing port 11 and a gas interface 12 are provided on the tank body 1. A cover body 2 is connected to the placing port 11. The cover body 2 is hermetically fitted with the placing port 11 to form a sealed cavity 10 inside the tank body 1. The gas interface 12 communicates with the sealed cavity 10.
[0034] The filling blocks 3 are stacked and arranged in the sealed cavity 10. The outer surface of the filling block 3 is a gas isolation surface. A test space 14 for placing the electric core 4 is further provided between the tank body 1 and the filling block 3. A pressure measuring port 13 is provided on the tank body 1. The pressure measuring structure is installed at the pressure measuring port 13 for detecting the gas pressure inside the sealed cavity 10. A temperature measuring port 20 is further provided on the tank body 1 or the cover body 2. The temperature sensor is installed at the temperature measuring port 20 for detecting the gas temperature in the sealed cavity 10.
[0035] The gas collecting tank for testing the electric core adopts a design form of the tank body 1, the cover body 2, the filling block 3, the pressure measuring structure 5 and the temperature sensor. A placing port 11 and a gas interface 12 are provided on the tank body 1. The cover body 2 is connected to the placing port 11 of the tank body 1. The gas interface 12 communicates with the sealed cavity 10. When the cover body 2 is closed, the cover body 2 is hermetically fitted with the placing port 11, thereby forming a sealed cavity 10 inside the tank body 1 to ensure that the high temperature and harmful gases generated by the failure of the electric core 4 are accumulated in the sealed cavity 10. The air in the sealed cavity 10 can be pumped out through the gas interface 12, and an inert gas with a corresponding volume can be filled to make the pressure in the sealed cavity 10 reach the set test air pressure. The harmful gases released by the failure of the electric core 4 can also be collected through the gas interface 12 for subsequent detection of the gas components.
[0036] Among them, the filling blocks 3 are stacked and arranged in the sealed cavity 10. A test space 14 is further provided between the tank body 1 and the filling block 3. That is to say, stacking and arranging the filling blocks 3 in the sealed cavity 10 can effectively occupy the internal space of the tank body 1, reducing the volume of nitrogen gas filled into the tank body 1 subsequently. Moreover, a test space 14 is reserved in the sealed cavity 10 to ensure that the electric core 4 can be smoothly placed in the space other than that occupied by the filling block 3. In addition, the outer surface of the filling block 3 is a gas isolation surface, which can prevent the gas released by the failure of the electric core 4 from possibly penetrating into the filling block 3, ensuring that the gas can only be accumulated in the space outside the filling block 3. In addition, a pressure measuring port 13 is provided on the tank body 1. The pressure measuring structure 5 is installed at the pressure measuring port 13. A temperature measuring port 20 is further provided on the tank body 1 or the cover body 2. The temperature sensor is installed at the temperature measuring port 20.
[0037] During the test, according to the shape and size of the sealed cavity 10 and the battery cell 4, select the filling block 3 and place it in the tank body 1, leaving a test space 14 for the placement of the battery cell 4. After placing the battery cell 4, close the cover body 2; draw out the air through the gas interface 12 and then fill in an appropriate volume of inert gas to trigger the failure of the battery cell 4. The pressure measuring structure 5 can be used to detect the gas pressure inside the sealed cavity 10, and the temperature sensor can detect the gas temperature in the sealed cavity 10 in real time. The harmful gas released by the failure of the battery cell 4 can also be collected through the gas interface 12. Compared with the existing gas collection device, this battery cell test gas collection tank not only avoids affecting the detection accuracy of various parameters such as temperature and pressure due to a large amount of nitrogen, but also ensures the purity of gas collection.
[0038] In this embodiment, there are at least two filling blocks 3. The outer side of the filling block 3 is provided with a fitting portion 30, and the fitting portions 30 of two adjacent filling blocks 3 are in concave-convex fit. Specifically, the contour shape of the sealed cavity 10 is cylindrical, the shape of the filling block 3 is prismatic, and the length direction of the filling block 3 extends parallel to the axis direction of the tank body 1. During the test, the filling block 3 can be placed in the sealed cavity 10 along the axis direction of the tank body 1, and multiple filling blocks 3 are spliced and combined in the radial plane of the tank body 1. The fitting portion 30 ensures the splicing reliability between two adjacent filling blocks 3.
[0039] As a further preferred solution, the filling block 3 has a splicing side surface 31, the fitting portion 30 is arranged on the splicing side surface 31, and the fitting portion 30 is a convex rib or a groove extending along the length direction of the filling block 3. The filling block 3 also has an arc-shaped side surface 32, and the arc-shaped side surface 32 is in contact with the inner wall of the tank body 1. By using the arc-shaped side surface 32 in contact with the inner wall of the tank body 1, the shape matching degree between the filling block 3 and the sealed cavity 10 is improved, ensuring that the filling block 3 can fully occupy the internal space of the tank body 1.
[0040] The filling block 3 is a hollow block body, and the filling block 3 is formed by sealing and welding multiple steel plates. The surface of the steel plate constitutes a gas isolation surface. Specifically, a 10-mm-thick steel plate is selected for the steel plate, and the fitting portion 30 is arranged on the surface of the steel plate. For example, the groove is formed by machining, and the convex rib is formed by welding a stacked steel bar on the surface of the steel plate.
[0041] The pressure measuring structure 5 includes a cylinder body 50, a piston rod 51, a pressure sensor 52 and a fixing bracket 53. The cylinder body 50 is fixedly connected to the pressure measuring port 13. The piston rod 51 is slidably and sealingly installed in the cylinder body 50. The fixing bracket 53 is installed on the outer side of the tank body 1. The pressure sensor 52 is arranged on the fixing bracket 53 and the pressure sensor 52 is connected to the piston rod 51. A sealing ring 54 is also arranged between the cylinder body 50 and the piston rod 51. After the battery cell 6 fails, high temperature and harmful gases are released, causing the temperature and pressure in the sealing cavity 10 to rise rapidly. A pressure action is exerted on the piston rod 51 through the pressure measuring port 13, and the pressure sensor 52 is used to detect the pressure of the piston rod 51 and convert it into a pressure parameter. And, there are multiple gas interfaces 12, which include a vacuum pumping interface 121, a nitrogen filling interface 122 and a gas collecting interface 123.
[0042] In this embodiment, a heating sheet 6 is further arranged in the test space 14. The heating sheet 6 has a heat-conducting surface for contact and cooperation with the battery cell 4, and the heating sheet 6 provides a failure condition for the battery cell 4. In other embodiments, in order to meet different usage requirements, the heating sheet can also be replaced with a puncture needle. Correspondingly, the puncture needle is fixedly connected to the lower end of the piston rod, and the piston rod is used to drive the puncture needle to pierce the battery cell 4, thereby triggering the rapid failure of the battery cell 4.
[0043] In addition, two access openings 11 are arranged on the tank body 1, and there are two cover bodies 2. One of the cover bodies 2 is hingedly installed at one access opening 11, and the other cover body 2 is fixedly installed at the other access opening 11 through bolts. The other cover body 2 serves as a spare tank cover, and the spare tank cover can be opened in an emergency to smoothly open the access opening 11.
[0044] The battery cell test gas collecting tank of other embodiments of the present utility model is different from the above specific implementation in that: the shape and quantity of the filling blocks can be flexibly adjusted according to actual needs. Specifically, there can also be only one filling block. Or, as Figure 4 shown, there are multiple filling blocks, which are divided into filling blocks 3a at the bottom and filling blocks 3b on the side. The filling blocks 3a at the bottom and the filling blocks 3b on the side are in a flat contact relationship, and the structure is simple and convenient for stacking and setting. Moreover, the filling blocks 3a at the bottom have an arc-shaped bottom surface and an upper plane, and the filling blocks 3b on the side have an arc-shaped side surface and a side plane. The arc-shaped bottom surface and the arc-shaped side surface can form a tight fit with the inner wall of the tank body 1, and the test space for placing the battery cell 4 is surrounded by the upper plane and the side plane.
[0045] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.
Claims
1. A gas collecting tank for cell testing, characterized in that it comprises: A tank body (1), on which a pick-up and placement opening (11) and a gas interface (12) are provided. A cover body (2) is connected to the pick-up and placement opening (11), and the cover body (2) is in sealing cooperation with the pick-up and placement opening (11) to form a sealed cavity (10) inside the tank body (1). The gas interface (12) is communicated with the sealed cavity (10); Filling blocks (3), which are stacked and arranged in the sealed cavity (10). The outer surface of the filling block (3) is a gas isolation surface, and a testing space (14) for placing the cell (4) is further provided between the tank body (1) and the filling block (3); A pressure measuring structure (5), a pressure measuring port (13) is provided on the tank body (1), and the pressure measuring structure (5) is installed at the pressure measuring port (13) for detecting the gas pressure inside the sealed cavity (10); A temperature sensor, a temperature measuring port (20) is further provided on the tank body (1) or the cover body (2), and the temperature sensor is installed at the temperature measuring port (20) for detecting the gas temperature in the sealed cavity (10).
2. The cell test gas collecting tank according to claim 1, characterized in that, There are at least two filling blocks (3), and a fitting part (30) is arranged on the outer side of the filling block (3). The fitting parts (30) of adjacent two filling blocks (3) are in concave-convex cooperation.
3. The gas collection tank for cell testing according to claim 2, wherein The contour shape of the sealed cavity (10) is cylindrical, the shape of the filling block (3) is prismatic, and the length direction of the filling block (3) extends parallel to the axis direction of the tank body (1).
4. The cell test gas collecting tank according to claim 3, characterized in that, The filling block (3) has a splicing side surface (31), the fitting part (30) is arranged on the splicing side surface (31), and the fitting part (30) is a convex rib or a groove extending along the length direction of the filling block (3).
5. The air collecting tank for cell testing according to claim 3, characterized in that The filling block (3) also has an arc-shaped side surface (32), and the arc-shaped side surface (32) is attached to the inner wall of the tank body (1).
6. The cell testing gas collecting tank according to claim 1, characterized in that, The filling block (3) is a hollow block body, and the filling block (3) is formed by sealing and welding a plurality of steel plates, and the surface of the steel plate constitutes the gas isolation surface.
7. The cell test gas collecting tank according to claim 1, characterized in that, The pressure measuring structure (5) includes a cylinder body (50), a piston rod (51), a pressure sensor (52) and a fixing bracket (53). The cylinder body (50) is fixedly connected to the pressure measuring port (13), the piston rod (51) is slidably and sealingly installed in the cylinder body (50), the fixing bracket (53) is installed on the outer side of the tank body (1), and the pressure sensor (52) is arranged on the fixing bracket (53) and the pressure sensor (52) is connected to the piston rod (51).
8. The air collection tank for cell testing according to claim 1, characterized in that, A plurality of gas interfaces (12) are provided, including a vacuum pumping interface (121), a nitrogen filling interface (122) and a gas collecting interface (123).
9. The cell test gas collecting tank according to claim 1, characterized in that, A heating sheet (6) is further provided in the testing space (14), and the heating sheet (6) has a heat conducting surface for contacting and cooperating with the cell (4).
10. The cell test gas collecting tank according to claim 1, characterized in that, Two access openings (11) are provided on the tank body (1), and two cover bodies (2) are provided. One of the cover bodies (2) is hingedly installed at one of the access openings (11), and the other cover body (2) is fixedly installed at the other access opening (11) by bolts.