A battery cell storage gas production testing device

Abstract

The utility model provides a kind of electric core storage gas production testing device, it is related to battery technical field, including clamping tool and test component, clamping tool includes two parallelly arranged clamps and several fastening components, fixed space for accommodating electric core is formed between two clamps, and the clamping fixation of electric core is realized by fastening component;Test component includes test seat and gas pressure detection element, test seat is fixedly installed on the top surface of two clamps, test seat has the test port matched with the liquid injection hole of electric core, test port is sealed butt joint with the liquid injection hole of electric core, gas pressure detection element is fixedly arranged on test seat and is communicated with test port, for real-time detection electric core internal gas pressure change data.The electric core storage gas production testing device disclosed by the utility model can accurately reflect the gas amount and gas composition change generated in the storage process of electric core by real-time monitoring the internal gas pressure change of electric core, and the whole testing device is simple in structure, convenient to operate and high in precision.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell storage gas generation testing device. Background Technology

[0002] Gas generation is an unavoidable phenomenon during battery manufacturing and use, including gas generation during formation, cycling, overcharging and over-discharging, and storage. The requirements for the amount and composition of gas generation vary under different operating conditions. Among these, storage gas generation testing is designed to simulate the performance stability of battery cells during storage, helping researchers to better optimize materials and cell design.

[0003] Currently, commonly used devices for detecting gas generation during storage mainly include water displacement collection, differential pressure analyzers, and gas chromatographs. While the water displacement collection method is simple to operate, its measurement accuracy is greatly affected by ambient temperature and pressure, and it cannot distinguish gas components. Differential pressure analyzers, although capable of high-precision pressure change measurement, have extremely strict temperature control requirements for the testing environment and also cannot provide gas composition information. Gas chromatographs, while capable of accurately analyzing gas components, are expensive, complex to operate, and have long testing cycles, making them unsuitable for the rapid detection of large batches of samples.

[0004] These testing devices generally suffer from problems such as insufficient measurement accuracy, low testing efficiency, or excessively high usage costs, which restricts the widespread application of gas generation testing in battery cell R&D and quality control. Utility Model Content

[0005] In view of this, the present invention proposes a battery cell gas generation testing device to solve the problems of complex structure, cumbersome operation, poor stability and insufficient testing accuracy of existing testing devices.

[0006] The technical solution of this utility model is implemented as follows:

[0007] This utility model provides a battery cell storage gas generation testing device, comprising:

[0008] The clamping fixture includes two parallel clamping plates and several fastening components. A fixed space for accommodating the battery cell is formed between the two clamping plates, and the battery cell is clamped and fixed by the fastening components.

[0009] The testing assembly includes a test base and a pressure detection element. The test base is fixedly installed on the top surface of two clamping plates. The test base has a test port that matches the liquid injection hole of the battery cell. The test port is sealed and connected to the liquid injection hole of the battery cell. The pressure detection element is fixedly installed on the test base and communicates with the test port to detect the change data of internal pressure of the battery cell in real time.

[0010] Based on the above technical solution, preferably, a positioning structure is also provided between the two clamping plates for positioning the battery cell in the vertical and horizontal directions within the fixed space.

[0011] Based on the above technical solution, preferably, the positioning structure includes a horizontally arranged support plate and a vertically arranged limiting plate. The support plate is symmetrically arranged on the bottom inner side of the two clamping plates to support the battery cell; the limiting plate is symmetrically arranged on the inner side of one end of the two clamping plates to restrict the horizontal movement of the battery cell.

[0012] Based on the above technical solution, preferably, the distance between the support plate and the top surface of the clamping plate is less than or equal to the height of the battery cell, and the height difference between the two is 0 to 2 mm.

[0013] Based on the above technical solution, preferably, the top surface of the clamping plate is provided with a fixing hole for connecting to the test base. The distance from the center of the fixing hole to the end face of the limiting plate facing the battery cell is L1, and the distance from the center of the battery cell injection hole to the end face of the battery cell in contact with the second positioning plate is L2. The difference between L1 and L2 is in the range of 0 to 5 mm. Both ends of the test base are provided with oblong holes along the length of the clamping plate, and the oblong holes are connected to the fixing hole by locking bolts.

[0014] Based on the above technical solution, preferably, a sealing ring is coaxially fixed on the outside of the test port, and the inner diameter of the sealing ring is larger than the diameter of the battery cell injection hole.

[0015] Based on the above technical solution, preferably, the fastening assembly includes connecting posts and fastening bolts disposed at the four corners of the clamping plate, the connecting posts being located between the two clamping plates, and the fastening bolts passing through through holes in the clamping plate and threadedly connected to the connecting posts.

[0016] Based on the above technical solution, preferably, the air pressure detection element is an air pressure sensor or an air pressure gauge.

[0017] The present invention has the following advantages over the prior art:

[0018] (1) The cell storage gas generation test device disclosed in this utility model can accurately reflect the changes in the amount and composition of gas generated during cell storage by real-time monitoring of the internal gas pressure changes of the cell. The entire test device has a simple structure, is easy to operate and has high precision. It can effectively solve the problems of insufficient precision, long test cycle and high cost of traditional test methods, and provides strong support for battery research and development, optimization design and quality control.

[0019] (2) By setting a support plate and a limiting plate between the two clamping plates, a precise cell positioning structure is formed, which can effectively ensure that the cell will not be displaced during the clamping process, thereby ensuring the precise docking of the injection hole and the test port. This positioning structure also improves the testing efficiency, reduces the complexity of operation and human error, and makes the cell storage gas generation test device more efficient and accurate in practical applications.

[0020] (3) By providing oblong holes at both ends of the test holder along the length of the clamping plate, and connecting the oblong holes to the fixing holes with locking bolts, the test holder can be finely adjusted horizontally after the battery cell is fixedly installed on the clamping fixture, thanks to the cooperation of the oblong holes and the fixing holes, thus ensuring precise alignment between the injection hole and the test port. The oblong holes provide a certain amount of sliding space, allowing for slight horizontal movement of the test holder, thereby compensating for any deviation in the position of the battery cell's injection hole. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a first-view three-dimensional structural diagram of the cell storage gas generation test device disclosed in this utility model.

[0023] Figure 2 This is a second-view three-dimensional structural diagram of the battery cell gas generation test device disclosed in this utility model.

[0024] Figure 3 This is a top view of the battery cell gas generation testing device disclosed in this utility model after removing the testing components;

[0025] Figure 4 The test component disclosed in this utility model

[0026] Figure 5 This is a top view of the battery cell gas generation testing device disclosed in this utility model;

[0027] Figure 6 for Figure 5 Planar sectional view at point AA;

[0028] Figure label:

[0029] 1. Clamping fixture; 11. Clamping plate; 12. Fastening assembly; D. Battery cell; D1. Injection hole; 13. Positioning structure; 131. Support plate; 132. Limiting plate; 111. Fixing hole; 121. Connecting column; 122. Fastening bolt; 2. Test assembly; 21. Test seat; 22. Air pressure detection element; 211. Test port; 212. Waist-shaped hole; 23. Locking bolt; 24. Sealing ring. Detailed Implementation

[0030] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0031] like Figure 1 As shown, combined with Figure 2-6 This utility model discloses a gas generation testing device for battery cell D storage, including a clamping fixture 1 and a testing component 2.

[0032] The clamping fixture 1 is used to clamp the battery cell D during the test. Specifically, the clamping fixture 1 includes two parallel clamping plates 11 and several fastening components 12. A fixed space for accommodating the battery cell D is formed between the two clamping plates 11, and the battery cell D is clamped and fixed by the fastening components 12.

[0033] In this embodiment, two clamping plates 11 clamp the two large surfaces of the battery cell D to prevent the large surfaces of the battery cell D from bulging during gas production. The function of the clamping fixture 1 is to ensure that the battery cell D can be firmly clamped during the test, so as to avoid affecting the test results due to the position change of the battery cell D during the test, and improve the stability of the test process.

[0034] The test assembly 2 includes a test base 21 and a pressure detection element 22. The test base 21 is fixedly installed on the top surface of two clamping plates 11. The test base 21 has a test port 211 that matches the liquid injection hole D1 of the battery cell. The test port 211 is sealed and connected to the liquid injection hole D1 of the battery cell. The pressure detection element 22 is fixedly installed on the test base 21 and communicates with the test port 211 to detect the internal pressure change data of the battery cell D in real time.

[0035] In this embodiment, the pressure detection element 22 can be a pressure gauge, which can display the internal pressure change of the battery cell D. The pressure detection element 22 can also be a pressure sensor, which can be connected to a data processing device to transmit the internal pressure data of the battery cell D to the data processing device in real time. The data processing device can plot the pressure change curve over time based on the pressure data, thereby detecting the pressure change and indirectly inferring the amount of gas generated by the battery cell D during the storage stage and its changing trend.

[0036] By using a pressure detection element 22 to monitor the internal pressure changes of the battery cell D in real time, this device can accurately reflect the pressure changes caused by gas generation during storage. Compared with traditional gas analysis methods, such as gas chromatography and water displacement gas collection, this device can more accurately capture data on gas changes within the battery cell D. Since pressure changes are directly related to gas generation, this testing device can improve testing accuracy, especially its stability and accuracy under high temperature and different storage conditions.

[0037] Compared to traditional testing methods (such as gas chromatographs), this testing device has a simpler structure and is more convenient to operate. The pressure detection element 22 is directly connected to the battery cell injection port D1 and can monitor pressure changes in real time, making the operation more direct and eliminating the need for complex analytical steps.

[0038] The battery cell storage gas generation testing device disclosed in this utility model can accurately reflect the changes in the amount and composition of gas generated during the storage process of battery cell D by real-time monitoring of the internal gas pressure changes. The entire testing device has a simple structure, is easy to operate and has high precision. It can effectively solve the problems of insufficient precision, long testing cycle and high cost of traditional testing methods, and provides strong support for battery research and development, optimization design and quality control.

[0039] To ensure that the battery cell D is firmly clamped by the two clamping plates 11 within a fixed space while accurately connecting the battery cell injection hole D1 with the test port 211, this embodiment also provides a positioning structure 13 between the two clamping plates 11. This structure is used to position the battery cell D vertically and horizontally within the fixed space. This design ensures that the battery cell D maintains its predetermined position within the fixed space, preventing displacement or tilting of the battery cell D during clamping. This ensures that while the battery cell D is clamped, the injection hole D1 can accurately connect with the test port 211, guaranteeing test stability and improving test accuracy.

[0040] Specifically, the positioning structure 13 includes a horizontally arranged support plate 131 and a vertically arranged limiting plate 132. The support plate 131 is symmetrically arranged on the bottom inner side of the two clamping plates 11 to support the battery cell D. The support plate 131 provides a stable basic support, ensuring that the battery cell D can maintain its vertical position when clamped, and avoiding vertical displacement.

[0041] The limiting plate 132 is symmetrically arranged on the inner side of one end of the two clamping plates 11 to restrict the horizontal movement of the battery cell D. The limiting plate 132 can effectively prevent the battery cell D from being displaced in the horizontal direction and ensure the positional accuracy of the battery cell D in the horizontal direction.

[0042] Because the battery cell D is simultaneously constrained by the vertical and horizontal positioning structures 13, it will not tilt or shift after clamping, which greatly improves the stability of the testing process. This avoids the risk of the battery cell D shifting due to loose clamps or asymmetrical clamping, which may occur in traditional methods, thus making the testing process more reliable.

[0043] The sealing and connection between the liquid injection port D1 and the test port 211 of the battery cell D is a key factor affecting the accuracy of the test results. The positioning structure 13 ensures that the battery cell D is accurately positioned on the test holder 21 during clamping, avoiding docking deviations that may be caused by displacement of the battery cell D. Precise docking ensures the sealing between the test port 211 and the liquid injection port D1, thereby ensuring the accurate acquisition of air pressure data.

[0044] By setting a support plate 131 and a limiting plate 132 between the two clamping plates 11, a precise positioning structure 13 for the battery cell D is formed. This effectively ensures that the battery cell D will not shift during clamping, thereby guaranteeing the precise alignment of the injection hole D1 with the test port 211. This positioning structure 13 also improves testing efficiency, reduces operational complexity and human error, making the battery cell D gas generation testing device more efficient and accurate in practical applications.

[0045] In some implementations, the distance between the support plate 131 and the top surface of the clamping plate 11 is less than or equal to the height of the battery cell D, and the height difference between the two is 0-2mm. Thus, after the battery cell D is fixed in the clamping fixture 1, the top surface of the battery cell D can be flush with or higher than the top surface of the clamping plate 11. The purpose of this setting is to ensure that after the test seat 21 is fixedly connected to the clamping plate 11, the test port 211 can be tightly pressed and fitted with the liquid injection hole D1 in the vertical direction.

[0046] It is understandable that if the test seat 21 is horizontally fixed on the top surface of the low-voltage clamp 11 with the cell injection hole D1, there will be a gap between the test port 211 on the bottom surface of the test seat 21 and the injection hole D1. This will result in a lack of tight fit, leading to gas leakage.

[0047] As some implementations, the top surface of the clamping plate 11 is provided with a fixing hole 111 that is connected to the test seat 21. The distance from the center of the fixing hole 111 to the end face of the limiting plate 132 facing the cell D is L1, and the distance from the center of the cell injection hole D1 to the end face of the cell D in contact with the second positioning plate is L2. The difference between L1 and L2 is in the range of 0 to 5 mm.

[0048] Specifically, in this embodiment, the value of L1 is fixed, while the value of L2 is floating. This depends on the consistency of product dimensions in the cell D manufacturing process, or the position of the injection hole D1 on the top surface of cell D. Since there may be dimensional errors during cell D manufacturing, the position of the injection hole D1 may also deviate. Therefore, there is a difference between L1 and L2. To ensure that the test port 211 and the injection hole D1 can accurately align after the test base 21 and the fixing hole 111 are connected, it is necessary to adjust the horizontal fine-tuning of the test base 21 to compensate for the positional deviation of the injection hole D1.

[0049] Therefore, in this embodiment, oblong holes 212 are respectively provided at both ends of the test base 21 along the length of the clamping plate 11, and the oblong holes 212 are connected to the fixing holes 111 by locking bolts 23. With this configuration, after the battery cell D is fixedly installed on the clamping fixture 1, the cooperation between the oblong holes 212 and the fixing holes 111 allows the test base 21 to be finely adjusted in the horizontal direction, thereby ensuring precise alignment between the injection hole D1 and the test port 211. Since the oblong holes 212 have a certain sliding space, they allow the test base 21 to make slight horizontal movements, thereby compensating for positional deviations in the battery cell injection hole D1.

[0050] In this embodiment, the waist-shaped hole 212 allows the test seat 21 to be finely adjusted within the range of 0-5mm, thereby flexibly adjusting the position of the test seat 21, compensating for the position deviation of the cell injection hole D1, and ensuring that the cell D and the test seat 21 can be accurately connected.

[0051] During the production of battery cell D, due to dimensional tolerances or deviations in the position of the injection port D1, the injection port D1 of battery cell D may not be precisely aligned with the test port 211. By providing oblong holes 212 at both ends of the test holder 21 and allowing the test holder 21 to be finely adjusted in the horizontal direction, the consistency problem of battery cell D's dimensions is effectively compensated for, ensuring precise alignment between the test port 211 and the injection port D1. Through the fine-tuning function, even if there is a small dimensional difference between the injection port D1 and the test port 211 of battery cell D, precise alignment can still be achieved, ensuring the accuracy of air pressure data acquisition.

[0052] As one implementation, a sealing ring 24 is coaxially fixed on the outside of the test port 211. The inner diameter of the sealing ring 24 is larger than the diameter of the cell injection hole D1. By embedding the sealing ring 24 into the bottom surface of the test base 21 and surrounding the outside of the test port 211, after the test port 211 and the injection hole D1 are connected, and after the test base 21 and the clamping plate 11 are tightly connected, the sealing ring 24 is compressed in the axial direction to achieve a reliable seal at the connection between the test port 211 and the injection hole D1. This ensures that during the gas generation process of the cell D, the gas is discharged through the injection hole D1 and captured by the gas pressure detection element 22, thereby completing the gas generation test of the cell D during storage in real time and accurately.

[0053] It is worth noting that the gas generation test of cell D requires that after the electrolyte filling of cell D is completed, the sealing aluminum block is not welded to block the filling hole D1 in advance, so that cell D is in a static storage stage to test the gas generation inside cell D, thereby evaluating the performance of cell D.

[0054] In this embodiment, the fastening assembly 12 includes connecting posts 121 and fastening bolts 122 disposed at the four corners of the clamping plate 11. The connecting posts 121 are located between the two clamping plates 11, and the fastening bolts 122 pass through the through holes on the clamping plate 11 and are threadedly connected to the connecting posts 121.

[0055] In actual use, one end of the four connecting posts 121 is installed on the inner corner of one of the clamping plates 11 by fastening bolts 122. Then, the battery cell D is placed on the positioning structure 13, and another clamping plate 11 is placed on the other side of the battery cell D. The connecting posts 121 are locked and connected by fastening bolts 122 passing through the clamping plate 11, thus completing the clamping and fixing of the battery cell by the clamping fixture 1.

[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electric cell storage gas production testing device characterized by, include: The clamping fixture (1) includes two parallel clamping plates (11) and several fastening components (12). A fixed space for accommodating the battery cell (D) is formed between the two clamping plates (11), and the battery cell (D) is clamped and fixed by the fastening components (12). The test assembly (2) includes a test base (21) and a pressure detection element (22). The test base (21) is fixedly installed on the top surface of two clamping plates (11). The test base (21) has a test port (211) that matches the cell injection hole (D1). The test port (211) is sealed and connected to the cell injection hole (D1). The pressure detection element (22) is fixedly installed on the test base (21) and communicates with the test port (211) to detect the internal pressure change data of the cell (D) in real time.

2. The electric cell storage gas production testing device of claim 1, wherein: A positioning structure (13) is also provided between the two clamping plates (11) for positioning the battery cell (D) in the vertical and horizontal directions within a fixed space.

3. The electric cell storage gas production testing apparatus of claim 2, wherein: The positioning structure (13) includes a horizontally arranged support plate (131) and a vertically arranged limiting plate (132). The support plate (131) is symmetrically arranged on the bottom inner side of the two clamping plates (11) to support the battery cell (D). The limiting plate (132) is symmetrically arranged on the inner side of one end of the two clamping plates (11) to restrict the horizontal movement of the battery cell (D).

4. The electric cell storage gas production testing apparatus of claim 3, wherein: The distance between the support plate (131) and the top surface of the clamping plate (11) is less than or equal to the height of the battery cell (D), and the height difference between the two is 0 to 2 mm.

5. The electric cell storage gas production testing apparatus of claim 3, wherein: The top surface of the clamping plate (11) is provided with a fixing hole (111) that is connected to the test seat (21). The distance from the center of the fixing hole (111) to the end face of the limiting plate (132) facing the cell (D) is L1, and the distance from the center of the cell injection hole (D1) to the end face of the cell (D) that contacts the second positioning plate is L2. The difference between L1 and L2 is 0 to 5 mm. The two ends of the test seat (21) are respectively provided with waist-shaped holes (212) along the length direction of the clamping plate (11). The waist-shaped holes (212) and the fixing hole (111) are connected by locking bolts (23).

6. The electric cell storage gas production testing device of claim 1, wherein: A sealing ring (24) is coaxially fixed on the outside of the test port (211), and the inner diameter of the sealing ring (24) is larger than the diameter of the cell injection hole (D1).

7. The electric cell storage gas production testing apparatus of claim 1, wherein: The fastening assembly (12) includes connecting posts (121) and fastening bolts (122) disposed at the four corners of the clamping plate (11). The connecting posts (121) are located between the two clamping plates (11), and the fastening bolts (122) pass through the through holes on the clamping plate (11) and are threadedly connected to the connecting posts (121).

8. The electric cell storage gas production testing device of claim 1, wherein: The pressure detection element (22) is a pressure sensor or a pressure gauge.

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