Battery cell gas generation expansion detection tool

Abstract

The application discloses a kind of battery gas production expansion detection tool, it is related to battery testing technical field.The battery gas production expansion detection tool includes shell, gas production collection component and film pressure sensor, multiple installation cavities for installing battery in shell, gas production collection component is set above installation cavity and is communicated with the liquid injection port of battery, gas production collection component includes connecting pipe and gas production collection bag, connecting pipe two ends are connected respectively liquid injection port of battery and gas production collection bag, film pressure sensor is set in installation cavity, the detection surface of film pressure sensor is towards battery to detect the pressure that battery expansion exerts on detection surface.It can monitor the expansion amount and gas production of battery.

Description

Technical Field

[0001] This application relates to the field of battery cell testing technology, and more specifically, to a battery cell gas expansion detection fixture. Background Technology

[0002] During charging and discharging, battery cells produce gas. Excessive gas production can damage the battery structure and even cause safety issues. Too much gas can accelerate the breakdown of the battery's internal structure and reduce its cycle stability. During charging and discharging, internal chemical reactions generate gas, which can lead to increased internal pressure and cell expansion. Temperature changes can also cause cell expansion. Furthermore, the insertion and extraction of lithium ions into the electrode active materials during charging and discharging can cause battery expansion and contraction, resulting in irreversible expansion and serious consequences such as core deformation, material particle breakage, SEI film rupture, and electrolyte depletion.

[0003] Gas production testing reveals the gas generation under different charge and discharge conditions. Collecting this gas allows for compositional analysis, predicting potential safety risks during battery use and effectively assessing cell safety performance. Excessive expansion testing directly reflects the battery's physical stability during charge and discharge. Excessive expansion can lead to internal short circuits, capacity decay, and even thermal runaway, making expansion testing a crucial indicator for evaluating battery performance and safety. Currently, there is no equipment available to monitor cell expansion and gas production. Utility Model Content

[0004] The purpose of this application is to provide a battery cell gas expansion detection fixture, which can monitor the expansion and gas production of the battery cell.

[0005] The embodiments of this application are implemented as follows:

[0006] This application provides a battery cell gas expansion detection fixture, including a housing, a gas collection assembly, and a thin-film pressure sensor. The housing has multiple mounting chambers for mounting the battery cells. The gas collection assembly is disposed above the mounting chambers and communicates with the liquid injection port of the battery cell. The gas collection assembly includes a connecting pipe and a gas collection bag. The two ends of the connecting pipe are respectively connected to the liquid injection port of the battery cell and the gas collection bag. The thin-film pressure sensor is disposed in the mounting chamber, with the detection surface of the thin-film pressure sensor facing the battery cell to detect the pressure exerted on the detection surface by the expansion of the battery cell.

[0007] Optionally, as an implementable method, the mounting chamber has an opening above it, and a pressure block is provided over the opening. The pressure block has a connecting cavity that connects the cell's liquid injection port and the connecting tube.

[0008] Optionally, as an implementable method, the connecting cavity has an air inlet located at the bottom of the pressure block and an air outlet located on the side wall of the pressure block, the air inlet being connected to the liquid injection port of the battery cell, and the air outlet being connected to the connecting pipe.

[0009] Optionally, as an implementable method, a flow meter is provided on the connecting pipe to detect the flow rate of the connecting pipe.

[0010] Alternatively, as an implementable approach, the housing may also have a mounting slot for housing the flow meter.

[0011] Alternatively, as one possible implementation, the pressure block is hinged above the housing.

[0012] Optionally, as an implementable method, the housing is provided with a rotating connecting seat and a locking pin. The rotating connecting seat is located on one side of the mounting chamber, the pressure block is provided with a rotating shaft hinged to the rotating connecting seat, the locking pin is located on the other side of the mounting chamber, and the pressure block is provided with a socket corresponding to the locking pin. When the pressure block is placed on the opening, the pin is inserted into the socket.

[0013] Optionally, as an implementable approach, a data acquisition unit electrically connected to the thin-film pressure sensor is also included to collect pressure data detected by the thin-film pressure sensor.

[0014] Optionally, as an implementable method, the inner wall of the mounting chamber is provided with a guide groove, through which the battery cell is guided into the mounting chamber.

[0015] Optionally, as an implementable method, the opening of the gas collection bag is provided with a control valve, which controls the opening and closing of the bag opening.

[0016] The beneficial effects of the embodiments of this application include:

[0017] The battery cell gas production and expansion detection fixture provided in this application includes a housing, a gas production collection assembly, and a thin-film pressure sensor. The housing has multiple mounting chambers for mounting the battery cells. The gas production collection assembly is located above the mounting chambers and is connected to the battery cell's liquid injection port. The gas production collection assembly includes a connecting pipe and a gas production collection bag. The two ends of the connecting pipe are connected to the battery cell's liquid injection port and the gas production collection bag, respectively. The thin-film pressure sensor is located in the mounting chamber, with its detection surface facing the battery cell to detect the pressure exerted on the detection surface by the battery cell's expansion. This fixture integrates gas production collection and expansion detection functions, enabling simultaneous monitoring of gas production and expansion during battery cell charging and discharging. This greatly enriches the detection dimensions. By collecting battery cell gas in real time and performing component analysis, as well as accurately measuring battery cell expansion, it is possible to more accurately predict the safety risks that the battery may encounter during actual use. This effectively makes up for the shortcomings of existing technologies in battery cell performance evaluation and provides a powerful means for battery cell quality control. Timely monitoring of cell gas production and expansion helps identify potential problems in advance during battery research and development and production. This allows for targeted measures to optimize cell design or adjust production processes, thereby effectively improving battery safety and reducing the incidence of safety accidents caused by cell issues. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is one of the structural schematic diagrams of the battery cell gas expansion detection fixture provided in the embodiments of this application;

[0020] Figure 2 This is the second schematic diagram of the battery cell gas expansion detection fixture provided in the embodiments of this application;

[0021] Figure 3 The third schematic diagram of the battery cell gas expansion detection fixture provided in the embodiments of this application.

[0022] Icons: 100-Battery cell gas expansion detection fixture; 110-Housing; 111-Installation chamber; 1111-Guide groove; 112-Installation groove; 120-Gas collection assembly; 121-Connecting pipe; 122-Gas collection bag; 123-Control valve; 124-Pressure block; 125-Flow meter; 126-Rotating connecting seat; 127-Locking pin; 130-Thin film pressure sensor; 200-Battery cell. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0025] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] Please refer to Figure 1 , Figure 2 and Figure 3 A battery cell gas expansion detection fixture 100 is provided, comprising a housing 110, a gas collection assembly 120, and a thin-film pressure sensor 130. The housing 110 has multiple mounting chambers 111 for mounting the battery cells 200. The gas collection assembly 120 is disposed above the mounting chambers 111 and communicates with the liquid injection port of the battery cell 200. The gas collection assembly 120 includes a connecting pipe 121 and a gas collection bag 122. The two ends of the connecting pipe 121 are respectively connected to the liquid injection port of the battery cell 200 and the gas collection bag 122. The thin-film pressure sensor 130 is disposed in the mounting chambers 111, with the detection surface of the thin-film pressure sensor 130 facing the battery cell 200 to detect the pressure exerted on the detection surface by the expansion of the battery cell 200.

[0028] Specifically, the housing 110 of the battery cell gas expansion testing fixture 100 of this application is carefully designed with multiple mounting chambers 111 for mounting the battery cells 200. These mounting chambers 111 can stably accommodate the battery cells 200, ensuring that the battery cells 200 are fixed in position during the testing process and are not affected by external interference, thus creating favorable conditions for accurate testing. The gas collection assembly 120 is located above the mounting chambers 111 and is provided with a gas collection assembly 120 that communicates with the liquid injection port of the battery cell 200. This assembly is specifically composed of a connecting pipe 121 that communicates with the liquid injection port of the battery cell 200 and a gas collection bag 122 connected to the end of the connecting pipe 121. The connecting pipe 121 is made of a flexible and well-sealed material, which can ensure that the gas generated by the battery cell 200 is smoothly introduced into the gas collection bag 122 without causing additional obstruction or influence on the normal charging and discharging process of the battery cell 200. The gas collection bag 122 is made of a material with good gas adsorption properties and stable chemical properties, ensuring complete collection and preservation of the gas generated by the battery cell 200 for subsequent component analysis. A thin-film pressure sensor 130 is also cleverly installed in the mounting chamber 111, in close contact with the sidewall of the battery cell 200. When the battery cell 200 expands during charging and discharging, the sidewall of the battery cell 200 applies pressure to the thin-film pressure sensor 130. Based on the principle of pressure change, the sensor can detect the expansion of the battery cell 200 in real time and accurately, transmitting this data signal to a connected external data acquisition system, providing a reliable basis for subsequent data analysis. It should be noted that multiple gas collection components 120 and thin-film pressure sensors 130 are included, each corresponding to one of the mounting chambers 111.

[0029] The battery cell gas expansion detection fixture 100 provided in this application includes a housing 110, a gas collection assembly 120, and a thin-film pressure sensor 130. The housing 110 has multiple mounting chambers 111 for mounting the battery cells 200. The gas collection assembly 120 is disposed above the mounting chambers 111 and connected to the liquid injection port of the battery cell 200. The gas collection assembly 120 includes a connecting pipe 121 and a gas collection bag 122. The two ends of the connecting pipe 121 are respectively connected to the liquid injection port of the battery cell 200 and the gas collection bag 122. The thin-film pressure sensor 130 is disposed within the mounting chambers 111. The 130° detection surface faces the cell 200 to detect the pressure exerted on the detection surface by the expansion of the cell 200. This integrates gas generation collection and expansion detection functions, enabling simultaneous monitoring of gas generation and expansion during the charging and discharging process of the cell 200. This significantly enriches the detection dimensions. By collecting gas generation data from the cell 200 in real time and performing component analysis, as well as accurately measuring the expansion, it is possible to more accurately predict potential safety risks that the battery may encounter during actual use. This effectively compensates for the shortcomings of existing technologies in cell 200 performance evaluation and provides a powerful means for cell 200 quality control. Timely monitoring of the gas generation and expansion of the cell 200 helps to identify potential problems in advance during battery research and development and production. Targeted measures can then be taken to optimize the cell 200 design or adjust the production process, thereby effectively improving battery safety and reducing the incidence of safety accidents caused by cell 200 issues.

[0030] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the installation chamber 111 has an opening at the top, and a pressure block 124 is provided at the opening. The pressure block 124 has a connecting cavity that connects the liquid injection port of the battery cell 200 and the connecting pipe 121.

[0031] Specifically, a pressure block 124 is provided to prevent the battery cell 200 from moving upwards during charging and discharging. The pressure block 124 has a connecting cavity that connects the liquid injection port of the battery cell 200 and the connecting tube 121. This design further optimizes the gas collection path and ensures the stability of the gas output from the liquid injection port of the battery cell 200.

[0032] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the connecting cavity has an air inlet located at the bottom of the pressure block 124 and an air outlet located on the side wall of the pressure block 124. The air inlet is connected to the liquid injection port of the battery cell 200, and the air outlet is connected to the connecting pipe 121.

[0033] The connecting cavity has an air inlet located at the bottom of the pressure block 124 and an air outlet located on the side wall of the pressure block 124. The air inlet is connected to the liquid injection port of the battery cell 200, and the air outlet is connected to the connecting pipe 121. This specific air inlet and outlet layout is carefully designed based on the gas flow characteristics and the structural features of the battery cell 200. The air inlet is connected to the liquid injection port of the battery cell 200, allowing the gas to enter the connecting cavity at the source of gas generation, while the air outlet is located on the side wall and connected to the connecting pipe 121, which facilitates the smooth flow of gas into the collection bag under pressure.

[0034] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, a flow meter 125 is installed on the connecting pipe 121 to detect the flow rate of the connecting pipe 121.

[0035] A flow meter 125 is installed on the connecting pipe 121. As a key component for flow monitoring, the flow meter 125 can detect the gas flow rate within the connecting pipe 121 in real time. The addition of the flow meter 125 enables dynamic monitoring of the gas production rate of the battery cell 200. Compared to simply collecting the final gas production volume, it provides a more detailed understanding of the gas production variation patterns of the battery cell 200 at different stages of charging and discharging, providing strong evidence for in-depth research on the internal chemical reaction process of the battery cell 200. Moreover, by setting a flow threshold, when an abnormal gas flow is detected, a warning signal can be issued in a timely manner, indicating possible battery cell 200 faults, such as a sudden increase in gas production caused by an internal short circuit, which helps to take measures in advance to ensure detection safety and data validity.

[0036] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the housing 110 also has a mounting groove 112 for housing the flow meter 125. The mounting groove 112 provides physical protection for the flow meter 125, preventing damage to the flow meter 125 due to collisions, vibrations, or other factors during the detection process, and ensuring its long-term stable operation. At the same time, the precise positioning function ensures the sealing and accuracy of the connection between the flow meter 125 and the connecting pipe 121, improving the flow detection accuracy.

[0037] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the pressure block 124 is hinged above the housing 110.

[0038] When installing the battery cell 200, the pressure block 124 can be easily opened to provide ample space for the battery cell 200 to be placed into the installation chamber 111. After the operation is completed, the pressure block 124 can be quickly closed. Compared with the traditional fixed structure pressure cover, this greatly improves the convenience of installing and removing the battery cell 200 and reduces the test preparation time.

[0039] Furthermore, the housing 110 is provided with a rotating connecting seat 126 and a locking pin 127. The rotating connecting seat 126 is located on one side of the mounting chamber 111. The pressure block 124 is provided with a rotating shaft that is hinged to the rotating connecting seat 126. The locking pin 127 is located on the other side of the mounting chamber 111. The pressure block 124 is provided with a socket corresponding to the locking pin 127. When the pressure block 124 is placed on the opening, the pin is inserted into the socket.

[0040] The housing 110 is provided with a rotating connecting seat 126 and a locking pin 127. The rotating connecting seat 126 is located on one side of the mounting chamber 111. The pressure block 124 is provided with a rotating shaft that is hinged to the rotating connecting seat 126, realizing the rotatable connection of the pressure block 124. The locking pin 127 is located on the other side of the mounting chamber 111. The pressure block 124 is provided with a corresponding insertion hole. When the pressure block 124 is placed on the opening, the pin is inserted into the insertion hole to ensure that the pressure block 124 is tightly closed, preventing the pressure block 124 from loosening due to vibration or other factors during the detection process, which would affect the gas collection and detection accuracy.

[0041] The rotating connector 126, in conjunction with the rotating shaft, enables flexible rotation. The locking mechanism of the locking pin 127 and the insertion hole ensures the stability of the pressure block 124 during operation. This combination satisfies both operational convenience and ensures the reliability of the testing process, guaranteeing a sealed gas transmission channel and stable pressure detection. This dual-protection mechanism effectively prevents safety hazards such as gas leakage and cell 200 displacement caused by accidental opening of the pressure block 124, providing safety protection for testing personnel and the testing environment.

[0042] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, it also includes a data acquisition unit electrically connected to the thin-film pressure sensor 130, which collects the pressure data detected by the thin-film pressure sensor 130. The data acquisition unit, acting as a signal receiving and processing center, possesses high-precision analog-to-digital conversion capabilities, enabling it to quickly and accurately collect the pressure data detected by the thin-film pressure sensor 130 and convert it into a digital signal suitable for analysis. It employs a stable and reliable wired or wireless transmission method with the sensor, ensuring uninterrupted and error-free data transmission.

[0043] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3As shown, the inner wall of the mounting chamber 111 is provided with a guide groove 1111, through which the battery cell 200 is guided into the mounting chamber 111.

[0044] The presence of the guide groove 1111 ensures that the battery cell 200 is quickly positioned during installation, reduces installation errors, ensures accurate docking of the battery cell 200 with components such as the thin-film pressure sensor 130 and the gas collection assembly 120, and improves detection accuracy.

[0045] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the gas collection bag 122 is equipped with a control valve 123 at its opening, which controls the opening and closing of the bag opening.

[0046] When gas samples need to be collected for component analysis, control valve 123 can be easily opened to obtain gas samples from different stages, meeting diverse detection needs. At the initial stage of detection or when sampling is not required, closing control valve 123 prevents external gases from entering the collection bag, ensuring sample purity. When it is necessary to remove the gas collection bag 122, control valve 123 can be closed to prevent gas leakage from the gas collection bag 122.

[0047] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tooling for detecting gas expansion in battery cells, characterized in that, The device includes a housing, a gas collection assembly, and a thin-film pressure sensor. The housing has multiple mounting chambers for mounting battery cells. The gas collection assembly is located above the mounting chambers and communicates with the liquid injection port of the battery cell. The gas collection assembly includes a connecting pipe and a gas collection bag. The two ends of the connecting pipe are respectively connected to the liquid injection port of the battery cell and the gas collection bag. The thin-film pressure sensor is located in the mounting chambers, with its detection surface facing the battery cell to detect the pressure exerted on the detection surface by the expansion of the battery cell.

2. The battery cell gas expansion detection fixture according to claim 1, characterized in that, The installation chamber has an opening at the top, and a pressure block is provided at the opening. The pressure block has a connecting cavity that connects the battery cell injection port and the connecting tube.

3. The battery cell gas expansion detection fixture according to claim 2, characterized in that, The connecting cavity has an air inlet located at the bottom of the pressure block and an air outlet located on the side wall of the pressure block. The air inlet is connected to the liquid injection port of the battery cell, and the air outlet is connected to the connecting pipe.

4. The battery cell gas expansion detection fixture according to claim 1, characterized in that, A flow meter is installed on the connecting pipe to detect the flow rate of the connecting pipe.

5. The battery cell gas expansion detection fixture according to claim 4, characterized in that, The housing also has a mounting slot for placing the flow meter.

6. The battery cell gas expansion detection fixture according to claim 2, characterized in that, The pressure block is hinged above the housing.

7. The battery cell gas expansion detection fixture according to claim 6, characterized in that, The housing is provided with a rotating connecting seat and a locking pin. The rotating connecting seat is located on one side of the mounting chamber. The pressure block is provided with a rotating shaft that is hinged to the rotating connecting seat. The locking pin is located on the other side of the mounting chamber. The pressure block is provided with a socket corresponding to the locking pin. When the pressure block is placed on the opening, the pin is inserted into the socket.

8. The battery cell gas expansion detection fixture according to claim 1, characterized in that, It also includes a data acquisition unit electrically connected to the thin-film pressure sensor, through which pressure data detected by the thin-film pressure sensor is collected.

9. The battery cell gas expansion detection fixture according to claim 1, characterized in that, The inner wall of the mounting chamber is provided with a guide groove, through which the battery cell is guided into the mounting chamber.

10. The battery cell gas expansion detection fixture according to claim 1, characterized in that, The gas collection bag is equipped with a control valve at its opening, which controls the opening and closing of the bag.

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