A battery leakage detection device and detection method

Abstract

This invention discloses a battery leakage detection device and method. In the detection device, an environmental adjustment module adjusts the environment of the detection space. During the environmental adjustment process, an organic volatile matter (EVM) detection module measures the concentration of EVMs within the detection space, while a size detection module measures the size data of the battery under test using the principle of sliding rheostat. A control module is connected to both the EVM detection module and the size detection module. The control module combines the changes in EVM concentration and the changes in the size data of the battery under test during the vacuuming operation to determine the leakage detection result. This combined approach of EVM detection and size detection achieves battery leakage detection. On the one hand, the use of the sliding rheostat principle to measure battery size avoids the influence of air pressure changes on the size of the battery under test; on the other hand, the comprehensive analysis combining the two detection methods improves the reliability of the detection results.

Description

Technical Field

[0001] This invention relates to the field of battery testing, and more particularly to a battery leakage detection device and method. Background Technology

[0002] As one of the core components of new energy vehicles, power batteries are undergoing continuous technological innovation. Leakage detection technology for power batteries also plays a crucial role in the production process.

[0003] When the electrolyte in a damaged battery comes into contact with moisture in the air, it produces hydrofluoric acid. The power batteries in new energy vehicles typically operate under high voltage; if hydrofluoric acid seeps into the battery, it can damage the battery structure and cause serious consequences.

[0004] In existing technologies, VOC detection or dimensional inspection methods are commonly used to detect whether a power battery has leakage defects. VOC detection determines whether a battery is leaking by measuring the concentration of volatile organic compounds, but the results are easily affected by interference, resulting in a high false positive rate. Dimensional inspection methods determine whether a battery is leaking based on the change in battery size during vacuuming; however, each test requires removing the battery from the vacuum chamber before and after vacuuming for dimensional measurement, and the battery's dimensional rebound can lead to inaccurate detection. Summary of the Invention

[0005] This invention provides a battery leakage detection device and detection method to improve the reliability of detection results.

[0006] According to one aspect of the present invention, a battery leakage detection device is provided, comprising: an environmental adjustment module, an organic volatile matter detection module, a size detection module, and a control module;

[0007] The environmental adjustment module is used to perform environmental adjustment operations on the detection space, wherein the environmental adjustment operations include vacuuming.

[0008] The volatile organic compound (VOC) detection module is used to measure the concentration of VOCs in the detection space during the environmental adjustment operation.

[0009] The size detection module is used to measure the size data of the battery under test by utilizing the principle of sliding resistance during the environmental adjustment operation.

[0010] The control module is connected to the volatile organic compound detection module and the size detection module respectively. The control module is used to determine the leakage detection result of the battery under test by combining the change in the concentration of volatile organic compounds in the detection space and the change in the size data of the battery under test during the vacuuming operation.

[0011] Optionally, the size detection module includes a sliding rheostat component, a positional component, and a measurement conversion unit;

[0012] Both the sliding resistance component and the measuring component are disposed within the detection space; the sliding resistance component includes a slider; the measuring component is disposed on the battery placement position in close contact with the battery under test, and is also connected to the slider of the sliding resistance component; the measuring component is used to drive the slider to move accordingly within the measuring range as the volume of the battery under test increases or decreases.

[0013] The measurement conversion unit is connected to the sliding rheostat assembly and the control module respectively. The measurement conversion unit is used to convert the access resistance of the sliding rheostat assembly into the size data of the battery under test and report it to the control module.

[0014] Optionally, the size detection module includes a sliding rheostat component, a positional component, and a measurement conversion unit;

[0015] Both the sliding resistance component and the measuring component are disposed within the detection space; the sliding resistance component includes a slider; the measuring component includes a guide and a contact, the guide and the contact are slidably connected, the guide is used to provide a guiding direction for the contact; the contact is in close contact with the surface of the battery under test and is also connected to the slider, the contact is used to drive the slider to move a corresponding distance along the guiding direction according to the volume change of the battery under test;

[0016] The measurement conversion unit is connected to the sliding rheostat assembly and the control module respectively. The measurement conversion unit is used to convert the access resistance of the sliding rheostat assembly into the size data of the battery under test and report it to the control module.

[0017] Optionally, the guide includes at least one guide post arranged in the same direction, the guide post being erected next to the battery placement position; the contact includes a cover plate, the cover plate being provided with guide holes corresponding to the guide posts; the guide holes are sleeved on their corresponding guide posts, for limiting the cover plate to move only along the extension direction of the central axis of the guide post.

[0018] Optionally, the sliding rheostat assembly further includes a resistor column; the slider includes a carbon brush and a conductor connector;

[0019] The resistor post is disposed on one side of the battery placement position, and the extension direction of the central axis of the resistor post is the same as the guide direction; the carbon brush is slidably connected to the resistor post, so that the carbon brush can only slide along the extension direction of the resistor post; one end of the conductor connector is fixedly connected to the carbon brush, and the other end is fixedly connected to the contact.

[0020] Optionally, the conductor connector includes an elastic element for providing pressure to the carbon brush against the resistor post, so that the carbon brush makes full contact with the side of the resistor post.

[0021] According to another aspect of the present invention, a battery leakage detection method is provided, which is implemented by any of the battery leakage detection devices described in the preceding aspect, the battery leakage detection method comprising:

[0022] An environmental adjustment operation is performed on the detection space, wherein the environmental adjustment operation includes a vacuuming operation;

[0023] During the environmental adjustment operation, the concentration of volatile organic compounds in the detection space is measured;

[0024] During the environmental adjustment operation, the dimensional data of the battery under test are measured using the principle of sliding rheostat.

[0025] By combining the changes in the concentration of volatile organic compounds in the detection space and the changes in the size data of the battery under test during the vacuuming operation, the leakage detection result of the battery under test is determined.

[0026] Optionally, the leakage detection result of the tested battery is determined by combining the change in the concentration of volatile organic compounds in the detection space and the change in the size data of the tested battery during the vacuuming operation, including:

[0027] Based on the initial and final concentrations of volatile organic compounds (VOCs) in the detection space, the change in the concentration of VOCs in the detection space during the vacuuming operation is determined.

[0028] Based on the initial and final size data of the battery under test, determine the amount of change in the size data of the battery under test during the vacuuming operation;

[0029] The changes in the concentration of volatile organic compounds and the changes in the size data are compared with their corresponding set thresholds.

[0030] If neither the change in the concentration of volatile organic compounds nor the change in the size data exceeds its corresponding set threshold, it is determined that the tested battery has not leaked.

[0031] If the change in the concentration of volatile organic compounds exceeds its corresponding set threshold, it is determined that the tested battery is leaking.

[0032] Optionally, after comparing the changes in the concentration of volatile organic compounds and the changes in the size data with their corresponding set thresholds, the method further includes:

[0033] If the change in the concentration of volatile organic compounds does not exceed its corresponding set threshold, but the change in the size data exceeds its corresponding set threshold, the tested battery is determined to have excessive gas.

[0034] Optionally, after determining the leakage detection result of the tested battery, the method further includes:

[0035] If the leakage detection result indicates that the tested battery is leaking, the vacuuming operation is repeated and the concentration of volatile organic compounds and the size data of the tested battery in the detection space are measured.

[0036] The leakage index of the tested battery is calculated based on the initial volatile organic compound concentration, the final volatile organic compound concentration, the initial size data, and the final size data during the two vacuuming operations.

[0037] The verification result of the leakage detection is determined based on the relative relationship between the leakage index and its corresponding set threshold.

[0038] If the verification results are consistent, the leakage index indicates the severity of leakage in the tested battery.

[0039] The battery leakage detection device and method provided in this embodiment include an environmental adjustment module, an organic volatile matter (EVM) detection module, a size detection module, and a control module. The environmental adjustment module prepares the detection space. The EVM detection module measures the concentration of EVMs within the detection space during environmental preparation. The size detection module measures the size of the battery under test using the principle of sliding rheostat during environmental preparation. The control module is connected to both the EVM detection module and the size detection module. The control module combines the changes in EVM concentration and the size of the battery under test during vacuuming to determine the leakage detection result. This combined approach of EVM and size detection achieves battery leakage detection. Firstly, by using the sliding rheostat principle to measure battery size within a vacuum environment, the influence of pressure changes on the battery size is avoided. Secondly, the combined analysis of these two detection methods minimizes the impact of random factors on the detection results, significantly improving their reliability.

[0040] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the composition of a battery leakage detection device provided in an embodiment of the present invention;

[0043] Figure 2 This is a schematic diagram of another battery leakage detection device provided in an embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram illustrating the composition of another battery leakage detection device provided in an embodiment of the present invention;

[0045] Figure 4 This is a schematic diagram of the structure of a sliding rheostat component and a measuring component provided in an embodiment of the present invention;

[0046] Figure 5 This is a schematic diagram of the structure of another battery leakage detection device provided in an embodiment of the present invention;

[0047] Figure 6 This is a schematic diagram illustrating the composition of another battery leakage detection device provided in an embodiment of the present invention;

[0048] Figure 7 A schematic flowchart of a battery leakage detection method provided in an embodiment of the present invention;

[0049] Figure 8 A schematic flowchart of another battery leakage detection method provided in an embodiment of the present invention;

[0050] Figure 9 This is a flowchart illustrating a method for detecting the severity of leakage according to an embodiment of the present invention. Detailed Implementation

[0051] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0053] Example 1

[0054] To address the problems mentioned in the background art, embodiments of the present invention provide a battery leakage detection device. Figure 1 This is a schematic diagram of a battery leakage detection device provided in an embodiment of the present invention. The connection relationship between the environmental adjustment module and other modules is omitted in the diagram. (Refer to...) Figure 1 The battery leakage detection device 100 includes an environmental adjustment module 101, an organic volatile matter (EVM) detection module 102, a size detection module 103, and a control module 104. The environmental adjustment module 101 provides a detection space for the battery under test and performs environmental adjustment operations on the detection space, including a vacuuming operation. During the environmental adjustment operation, the EVM detection module 102 measures the concentration of EVMs within the detection space. The size detection module 103 measures the size data of the battery under test using the principle of sliding rheostat during the environmental adjustment operation. The control module 104 is connected to both the EVM detection module 102 and the size detection module 103. The control module 104 combines the change in EVM concentration within the detection space and the change in the size data of the battery under test during the vacuuming operation to determine the leakage detection result of the battery under test.

[0055] Specifically, the environmental adjustment module 101 is a multifunctional integrated component capable of providing a sealed testing space for the battery under test and monitoring and adjusting the environmental parameters within that space. These environmental parameters may include air pressure, temperature, humidity, and the concentration of volatile organic compounds. For example, the environmental adjustment module 101 may include a vacuum chamber, a vacuum pumping device communicating with the interior of the vacuum chamber, and an air pressure sensor disposed within the vacuum chamber. During the testing process, the environmental adjustment module 101 can use the vacuum pumping device to evacuate the testing space and adjust the air pressure of the environment surrounding the battery under test through this vacuuming process.

[0056] The volatile organic compound (VOC) detection module 102 refers to a detection component that detects the concentration of VOCs in the gas within the detection space where the tested battery is located. The VOC detection module 102 can be connected to the environmental adjustment module 101. During and before the environmental adjustment module 101 evacuates the detection space, the VOC detection module 102 can detect the concentration of VOCs within the detection space. For example, the VOC detection module 102 may include a VOC detector, which can be connected to the vacuum port of the vacuum chamber via a vacuuming device. During the evacuation process of the environmental adjustment module 101, the VOC detector can sample the concentration of VOCs in the gas extracted by the vacuuming device in real time.

[0057] The size detection module 103 is a measuring component that uses the principle of sliding rheostat to measure the size of the battery under test in the detection space. During and before the vacuuming process of the detection space, the size detection module 103 converts the size change of the battery under test into the resistance change in the circuit connected to the sliding rheostat. By measuring the resistance in the circuit connected to the sliding rheostat, real-time sampling of the size data of the battery under test is achieved. For example, the size detection module 103 may include a sliding rheostat, a positional component, and a converter. The positional component is disposed within the detection space, connected to the outer surface of the battery under test, and moved according to the size change of the battery under test. The positional component is also connected to the slider of the sliding rheostat. As the size of the battery under test changes, the positional component can also drive the slider to slide on the resistive body, causing the resistance at both ends of the converter to change with the size of the battery under test. The converter can convert the measured resistance value into the size data of the battery under test according to a preset program, realizing real-time measurement of the size of the battery under test. The method of using the sliding resistance principle for size measurement eliminates the need for the tested battery to be removed from the testing space, thus avoiding measurement errors caused by the rebound of the tested battery size after being removed from the testing space and improving the reliability of the test.

[0058] The control module 104 is the data analysis and processing center of the battery leakage detection device 100. Exemplarily, the control module 104 may include devices with data storage, processing, and analysis capabilities, such as a microcontroller, microprocessor chip, server, or processor. The control module 104 is connected to both the volatile organic compound (VOC) detection module 102 and the size detection module 103. During the vacuuming process, the control module 104 can receive the VOC concentration data output by the VOC detection module 102 and the size data output by the size detection module 103, and preprocess the data. Exemplarily, preprocessing may include the removal, correction, and conversion of outliers, and may also include the selection of target data. Then, based on the preprocessed VOC concentration and size data, the control module 104 can determine the change in VOC concentration and the change in the size data of the tested battery within the detection space during the vacuuming operation. Finally, the control module 104, combining the changes in VOC concentration and size data within the detection space during the vacuuming operation, determines the leakage detection result of the tested battery. For example, the control module 104 can determine the leakage detection result of the tested battery based on the relative relationship between the change in the concentration of volatile organic compounds and the change in the size data and their corresponding set thresholds. For example, if neither the change in the concentration of volatile organic compounds nor the change in the size data exceeds the corresponding set threshold, it is determined that the tested battery has not leaked.

[0059] The battery leakage detection device provided in this embodiment includes an environmental adjustment module, an organic volatile matter (EVM) detection module, a size detection module, and a control module. The environmental adjustment module is used to adjust the environment of the detection space. The EVM detection module measures the concentration of EVMs within the detection space during environmental adjustment. The size detection module measures the size data of the battery under test using the principle of sliding rheostat during environmental adjustment. The control module is connected to both the EVM detection module and the size detection module. The control module combines the changes in EVM concentration within the detection space and the changes in the size data of the battery under test during the vacuuming operation to determine the leakage detection result. This combined approach of EVM detection and size detection achieves battery leakage detection. On one hand, by using the sliding rheostat principle to measure battery size within a vacuum environment, the influence of pressure changes on the battery size is avoided, improving the reliability of the detection results. On the other hand, the comprehensive analysis combining the two detection methods prevents the influence of accidental factors on the detection results, further enhancing the reliability of the results.

[0060] Example 2

[0061] Optionally, Figure 2This is a schematic diagram of another battery leakage detection device provided in an embodiment of the present invention. The connection relationship between the environmental adjustment module and other modules, units and components is omitted in the figure. Based on the foregoing embodiment, refer to Figure 2 The size detection module 103 includes a sliding resistance component 201, a measuring component 202, and a measurement conversion unit 203. The sliding resistance component 201 includes a slider; the measuring component 202 is disposed on the battery placement position, in close contact with the battery under test, and is also connected to the slider of the sliding resistance component 201; the measuring component 202 is used to move the slider within its measuring range as the volume of the battery under test increases or decreases. The measurement conversion unit 203 is connected to both the sliding resistance component 201 and the control module 104, and is used to convert the input resistance of the sliding resistance component 201 into the size data of the battery under test and report it to the control module 104.

[0062] Specifically, the battery placement position refers to a preset location within the testing space for fixing the battery under test. For example, the battery placement position can be a preset location provided by a fixture table capable of supporting and fixing the battery under test. The measuring component 202 is a measuring component disposed on the battery placement position, capable of correspondingly changing its state according to changes in the volume of the battery under test. The state change of the measuring component 202 may include changes in the shape and / or position of its components. The measuring component 202 is in close contact with the surface of the battery under test on the battery placement position and is also connected to the sliding element of the sliding rheostat component 201. During changes in the size of the battery under test, the shape and / or position of the measuring device will change accordingly, thereby causing the connected sliding element to move within its measuring range. For example, the measuring component 202 may include a clamping measuring device, a guiding measuring device, or any other measuring device that can drive a slider to move accordingly according to the volume change of the measured device. For example, the clamping measuring device can use two opposing clamps driven by an elastic member to clamp the battery under test. During the process of the size change of the battery under test, the distance between the two clamps will change accordingly with the size of the battery under test, thereby driving the slider in the sliding variable resistance component 201 to move within its measuring range. As another example, the contact device in the guiding measuring device is in close contact with the battery under test. The guiding device can define the sliding direction of the contact device. During the process of the battery size change, the contact device will also move accordingly along the sliding direction as the battery surface expands or contracts, thereby driving the slider in the sliding variable resistance component 201 to move within its measuring range.

[0063] The sliding rheostat component 201 refers to a component based on the principle of sliding rheostat, which changes the resistance value of the connected line by changing the position of its sliding member. Exemplarily, the sliding rheostat component 201 may include a sliding member and a fixed connecting member. The sliding member is connected to the measuring component 202; the sliding member and the fixed connecting member of the sliding rheostat component 201 are respectively connected to the measurement conversion unit 203 via circuits. The sliding member can move accordingly with the change of the state of the measuring component 202, changing its contact position with the long resistive surface, thereby changing the resistance value of the line between the sliding member and the other fixed connecting member. The measurement conversion unit 203 refers to a data conversion circuit or component capable of converting the connected resistance data of the sliding rheostat component 201 into the size data of the battery under test. The measurement conversion unit 203 is connected to the sliding member and the fixed connecting member of the sliding rheostat component 201 respectively, and can acquire the connected resistance of the sliding rheostat component 201 and convert it into the size data of the battery under test. Exemplarily, the measurement conversion unit 203 may include a resistance sampling circuit and a data conversion chip. The resistance sampling circuit is connected to both the sliding member and the fixed connector of the sliding rheostat assembly 201, and can collect the connection resistance between the sliding member and the fixed connector. The data conversion chip can be connected to both the resistance sampling circuit and the control module 104, and can use a preset program to convert the connection resistance into the size data of the battery under test and report it to the control module 104. The connection resistance and the size data of the battery under test can have a linear relationship.

[0064] In the battery leakage detection device provided in this embodiment, the size detection module includes a sliding rheostat assembly, a measuring component, and a measurement conversion unit. The sliding rheostat assembly includes a slider. The measuring component is disposed on the battery placement position, in close contact with the battery under test, and is also connected to the slider of the sliding rheostat assembly; the measuring component is used to move the slider within its range as the volume of the battery under test increases or decreases. The measurement conversion unit is connected to both the sliding rheostat assembly and the control module. The measurement conversion unit is used to convert the input resistance of the sliding rheostat assembly into the size data of the battery under test. By combining the sliding rheostat assembly, the measuring component, and the measurement conversion unit, reliable measurement of the size of the battery under test is achieved, further improving the reliability of the detection results.

[0065] Example 3

[0066] Optionally, Figure 3 This is a schematic diagram of another battery leakage detection device provided in an embodiment of the present invention. The connection relationship between the environmental adjustment module and other modules, units and components is omitted in the figure. Based on any of the foregoing embodiments, refer to Figure 3The size detection module 103 includes a sliding resistance component 201, a measuring component 202, and a measurement conversion unit 203. The sliding resistance component 201 includes a slider 301; the measuring component 202 includes a guide 302 and a contact 303. The guide 302 is slidably connected to the contact 303, providing a guiding direction for the contact 303. The contact 303 is in close contact with the surface of the battery under test and is also connected to the slider 301. The contact 303 moves the slider 301 a corresponding distance along the guiding direction according to the volume change of the battery under test. The measurement conversion unit 203 is connected to both the sliding resistance component 201 and the control module 104. The measurement conversion unit 203 converts the input resistance of the sliding resistance component 201 into the size data of the battery under test and reports it to the control module 104.

[0067] Specifically, the battery placement position refers to a preset location within the testing space for fixing the battery under test. For example, the battery placement position can be a preset location provided by a fixture table capable of supporting and fixing the battery under test. The measuring component 202 refers to a measuring component disposed on the battery placement position that can correspondingly change its state according to changes in the volume of the battery under test. The measuring component 202 includes a contact member 303 and a guide member 302. The contact member 303 is a device in the measuring component 202 that directly contacts the battery under test on the battery placement position. For example, the contact member 303 can be a cover plate disposed on the battery placement position, and the cover plate is connected to the sliding member 301 of the sliding rheostat component 201. During the testing process, the cover plate can be placed on the battery under test, and the cover plate can be raised or lowered as the volume of the battery under test increases or decreases, thereby driving the sliding member 301 of the sliding rheostat component to move correspondingly within its measuring range. The guide member 302 is a device that provides a guiding direction for the movement of the contact member 303. The contact 303 is connected to the guide 302. The contact 303 can move along the guide direction provided by the guide 302 under the drive of the battery being tested. For example, the guide 302 may include at least one of a track, a guide tube, and a guide post. Taking the guide 302 as a track, the edge of the contact 303 may be provided with a protrusion that fits into the shape of the track. The protrusion may be provided in the track so that the contact 303 can only move along the guide direction.

[0068] The sliding rheostat assembly 201 refers to an assembly that, based on the principle of sliding rheostat, changes the resistance value of the connected line by adjusting the position of its sliding member 301. Exemplarily, the sliding rheostat assembly 201 may include a sliding member 301 and a fixed connector. The sliding member 301 is connected to the measuring component 202; the sliding member 301 and the fixed connector of the sliding rheostat assembly 201 are respectively connected to the measurement conversion unit 203 via circuits. The sliding member 301 can move accordingly with the change in the state of the measuring component 202, changing its contact position with the long resistive surface, thereby changing the resistance value of the circuit between the sliding member 301 and the other fixed connector. The measurement conversion unit 203 refers to a data conversion circuit or assembly capable of converting the connected resistance data of the sliding rheostat assembly 201 into the size data of the battery under test. The measurement conversion unit 203 is connected to both the sliding member 301 and the fixed connector of the sliding rheostat assembly 201, and can acquire the connected resistance of the sliding rheostat assembly 201 and convert it accordingly into the size data of the battery under test. For example, the measurement conversion unit 203 may include a resistance sampling circuit and a data conversion chip. The resistance sampling circuit is connected to the slider 301 and the fixed connector of the sliding rheostat assembly 201, respectively, and can collect the connection resistance between the slider 301 and the fixed connector. The data conversion chip can be connected to the resistance sampling circuit and the control module 104, respectively, and can use a preset program to convert the connection resistance into the size data of the battery under test and report it to the control module 104. The connection resistance and the size data of the battery under test can have a linear relationship.

[0069] In the battery leakage device provided in this embodiment, the size detection module includes a sliding rheostat assembly, a measuring component, and a measurement conversion unit. Both the sliding rheostat assembly and the measuring component are disposed within the detection space. The sliding rheostat assembly includes a slider; the measuring component includes a guide and a contact. The guide and contact are slidably connected, and the guide provides a guiding direction for the contact. The contact is in close contact with the surface of the battery under test and is also connected to the slider. The contact moves the slider a corresponding distance along the guiding direction according to the volume change of the battery under test. The measurement conversion unit is connected to both the sliding rheostat assembly and the control module. The measurement conversion unit converts the input resistance of the sliding rheostat assembly into the size data of the battery under test and reports it to the control module. The guide and contact achieve a stable data conversion from the size change of the battery under test to the input resistance of the sliding rheostat assembly, further improving the reliability of the detection results.

[0070] Example 4

[0071] Optionally, Figure 4 This is a schematic diagram of the structure of a sliding rheostat assembly, a measuring assembly, and a battery placement position provided by a corresponding fixture table, based on any of the foregoing embodiments of the present invention. Figure 3 and Figure 4The guide member 302 in the measuring assembly 202 may include at least one guide post 401 arranged in the same direction, the guide post 401 being upright next to the battery placement position 402; the contact member 303 includes a cover plate 403, the cover plate 403 being provided with guide holes corresponding one-to-one with the guide posts 401; the guide holes are sleeved on their corresponding guide posts 401, used to limit the cover plate 403 to move only along the extension direction of the central axis of the guide post 401. The sliding variable resistor assembly 201 may include a slider 301 and a resistor post 404. The slider 301 includes a carbon brush 405 and a conductor connector 406. The resistor post 404 is disposed on one side of the battery placement position 402, the extension direction of the central axis of the resistor post 404 being the same as the guide direction; the carbon brush 405 is slidably connected to the resistor post 404, so that the carbon brush 405 can only slide along the extension direction of the resistor post 404; one end of the conductor connector 406 is fixedly connected to the carbon brush 405, and the other end is fixedly connected to the contact member 303.

[0072] Specifically, the cover plate 403 is a battery contact 303 disposed on the battery placement position 402. During the testing process, it can be placed on the battery under test and is moved as the volume of the battery under test increases or decreases. For example, the shape of the cover plate 403 can be adapted to the shape of the battery placement position 402. When the shape of the battery placement position 402 is rectangular, the cover plate 403 can be a rectangular rigid plate with a size slightly larger than the battery placement position 402, so that the cover plate 403 can fully contact the surface of the battery under test. The guide post 401 is a cylindrical guide device disposed next to the battery placement position 402. It can cooperate with the corresponding guide hole on the cover plate 403 to guide the movement of the cover plate 403. The guide posts 401 and the cover plate 403 have the same number of guide holes, which correspond one-to-one. The shape of the guide hole on the cover plate 403 matches the cross-sectional shape of its corresponding guide post 401, allowing the guide hole to fit onto the corresponding guide post 401 and restricting the cover plate 403 to move only along the extension direction of the central axis of the guide post 401. For example, if all four guide posts 401 are cylindrical and uprightly positioned at the four corners of the rectangular battery placement position 402, the rectangular cover plate 403 can have circular guide holes at each of its four corners, corresponding to each guide post 401. Each guide post 401 passes through its corresponding guide hole, thus restricting the cover plate 403 to move only along the extension direction of the central axis of the guide post 401. The guide post 401 may also include a guide section 407 and a limiting section 408. The guide hole fits onto the guide section 407, and the cross-section of the guide hole matches the cross-section of the wire section 407, allowing it to slide up and down the guide section 407. The cross-sectional area of ​​the limiting section 408 is larger than that of the guide section 407 and the guide hole. The positional relationship between the limiting section 407 and the guide section 408 can be interchanged to limit the movable height of the cover plate 403.

[0073] The slider 301 is a connecting component disposed between the measuring assembly 202 and the resistance post 404, and includes a carbon brush 405 and a conductor connector 406. The carbon brush 405 contacts the resistance post 404 and can slide along the extension direction of the central axis of the resistance post 404 on its surface. For example, the carbon brush 405 can be an arc-shaped graphite carbon brush 405 adapted to the curvature of the side surface of the resistance post 404. The arc shape allows the carbon brush 405 to fit more closely to the side surface of the resistance post 404, improving the stability of the connection and sliding. The conductor connector 406 is a component for connecting the carbon brush 405 and the measuring assembly 202, and at least the part connected to the carbon brush 405 is a conductor. The conductor position of the conductor connector 406 can serve as the moving contact of the sliding rheostat assembly 201, connected to the measurement conversion unit 203. Correspondingly, one end of the resistor column 404 serves as the stationary contact of the sliding rheostat assembly 201, connected to the measurement conversion unit 203, enabling the measurement conversion unit 203 to sample the input resistance of the sliding rheostat assembly 201. For example, the conductor connector 406 can be a metal elastic element or a metal connecting column. The metal elastic element can provide pressure to the carbon brush 405 against the resistor column 404, allowing the carbon brush 405 to make more thorough contact with the side of the resistor column 404, thus improving the structural stability of the dimensional measurement module.

[0074] The measurement conversion unit 203 can acquire the connection resistance of the sliding rheostat component 201 and convert it into the size data of the battery under test. Specifically, through the design of the size detection module 103, a linear relationship can be achieved between the connection resistance of the sliding rheostat component 201 and the size data of the battery under test. Therefore, the connection resistance of the sliding rheostat component 201 and its corresponding size data of the battery under test can be pre-calibrated to obtain the relationship between the connection resistance and the size data of the battery under test. Thus, during the actual testing process, the measurement conversion unit 203 can convert the connection resistance into the size data of the battery under test according to the relationship. During the calibration process, the connection resistance value of the carbon brush 405 at different positions on the resistor post 404 and the battery size data can be acquired. For example, when cover plate 403 is at position A, the battery size data is Da, and the connection resistance value of sliding rheostat component 201 is Ra; when cover plate 403 is at position B, the battery size data is Db, and the connection resistance value of sliding rheostat component 201 is Rb. Based on the two sets of data, the linear relationship between the connection resistance of sliding rheostat component 201 and the size data of the battery under test can be determined. Let the real-time size data be Y, and the real-time connection resistance be r. Based on the data in set A, the formula Da = k1 * Ra + m can be obtained, and based on the data in set B, the formula Db = k2 * Rb + m can be obtained, where k1 = (Da - Db) / (Ra - Rb), k2 = (RaDb - RbDa) / (Ra - Rb). Based on this, the linear relationship between the connection resistance of sliding rheostat component 201 and the size data of the battery under test can be determined as Y = k1 * r + k2 = [(Da - Db)r - RaDb + RbDa] / (Ra - Rb). In this way, during the vacuuming process, the measurement and conversion unit 203 can determine the size data of the battery under test based on the measured connection resistance, thereby eliminating the influence of air pressure fluctuations on the size detection results of the battery under test and improving the accuracy of the detection precision.

[0075] Example 5

[0076] Optionally, Figure 5 This is a schematic diagram of another battery leakage detection device provided in an embodiment of the present invention. Figure 6 This is a schematic diagram illustrating the composition of another battery leakage detection device provided in an embodiment of the present invention. Figure 5 The display of the control module is omitted. Based on any of the aforementioned embodiments, combined with... Figure 4 , Figure 5 and Figure 6 Environmental adjustment operations may also include gas filling operations, which refer to filling the detection environment with filling gas before vacuuming to ensure that the initial concentration of volatile organic compounds in the detection environment is the same for each test and to prevent the influence of residual gas from the previous test on the current test.

[0077] Specifically, the environmental adjustment module may include a vacuum chamber 501, a fixture 502, a pressure sensor 503, a vacuuming device 504, a gas filling device 505, and a gas storage tank 506. The fixture 502 and the pressure sensor 503 are both located within the vacuum chamber 501. The fixture 502 provides a battery placement position 402 and secures the battery under test in the battery placement position 402. The pressure sensor 503 is connected to the vacuuming device 504 and is used to detect the pressure data within the vacuum chamber 501, providing a pressure feedback signal to the vacuuming device 504. The gas storage tank 506 stores purified filling gas. The vacuum chamber 501 is respectively provided with a vacuuming port 507, a gas filling port 508, and a sampling port 509, and their corresponding first control valve 513, second control valve 514, and third control valve 515. The positions of the inflation port 508 and the sampling port 509 are related to the density of the filling gas. For example, if the density of the filling gas is greater than or equal to the density of air, the inflation port 508 can be set at the bottom of the vacuum chamber 501 and the sampling port 509 can be set at the top of the vacuum chamber 501; if the density of the filling gas is less than the density of air, the inflation port 508 can be set at the top of the vacuum chamber 501 and the sampling port 509 can be set at the bottom of the vacuum chamber 501, so as to ensure that during the inflation process, the filling gas can quickly squeeze the gas in the vacuum chamber 501 out of the vacuum chamber 501, thereby increasing the speed at which the filling gas fills the vacuum chamber 501.

[0078] The inflation device 505 is connected to the gas storage tank 506 and the inflation port 508 respectively. The inflation device 505 is used to fill the vacuum chamber 501 with the filling gas in the gas storage tank 506 before the vacuuming operation, until the concentration of volatile organic compounds (VOCs) in the gas overflowing from the sampling port 509 is within the allowable range. This achieves purification and unification of the gas environment in the vacuum chamber 501, preventing the gas released by the previously tested battery from affecting the test results. The VOCs detection module 102 includes a VOCs detector 510, a first VOCs detection probe 511 and a second VOCs detection probe 512 connected to the VOCs detector 510. The first VOCs detection probe 511 is located at the vacuum port 507, and the second VOCs detection probe 512 is located at the sampling port 509. The volatile organic compound (VOC) detector 510 is connected to the vacuum pumping device 504 via its gas path, so that the gas in the vacuum chamber 501 is captured and detected by the VOC detector 510 after being extracted from the vacuum port 507, thus enabling the detection of VOC concentration in the detection space during the vacuuming operation. The VOC detector 510 is also connected to the sampling port 509 via its gas path. Once the filling gas in the vacuum chamber 501 is full, it overflows from the sampling port 509, and the overflowing filling gas is captured and detected by the VOC detector 510, providing a sampling feedback signal to the gas filling device 505. If a gas filling program is set before vacuuming, the VOC concentration of the overflowing gas collected by the sampling port 509 when the gas filling device 505 stops filling can be used as the initial VOC concentration in the detection space during the vacuuming operation, participating in the determination of the leakage detection result of the tested battery.

[0079] For example, when it is necessary to perform leakage detection on the battery under test, the battery under test can be placed into the vacuum chamber 501 manually or by a feeding and conveying mechanism, and the battery under test can be fixed by the fixture table 502. For example, the battery under test can be inserted from the side between the cover plate 403 and the fixture table 502. The battery under test is positioned by the fixture table 502 in a flat position. At this time, the cover plate 403 is naturally pressed on the top of the battery under test and moves with the volume change of the battery under test.

[0080] After the battery under test is placed in and fixed in the vacuum chamber 501, its initial size data (D1) can be measured using a size detection device. The vacuum chamber 501 is then sealed, creating a closed space. The vacuum port 507 is closed, while the gas filling port 508 and sampling port 509 are opened. The filling gas from the gas storage tank 506 is then filled into the vacuum chamber 501 using the gas filling device 505, and the filling gas overflows from the sampling port 509. The filling gas in the gas storage tank 506 can include any one of hydrogen, helium, nitrogen, or purified ordinary air collected in a designated space. Closing the vacuum port 507 prevents the filling gas from overflowing from it. The organic volatile matter detector 510 detects the change in the concentration of organic volatile matter in the gas overflowing from the sampling port 509. If the change in the concentration of organic volatile matter in the gas overflowing from the sampling port 509 within a unit time is less than the change threshold (or the concentration of organic volatile matter in the gas overflowing from the sampling port 509 is equal to the concentration of organic volatile matter in the gas storage tank 506), it indicates that the filling gas has filled the internal space of the vacuum chamber 501. At this time, the concentration of organic volatile matter collected by the current sampling port 509 can be recorded as the initial concentration of organic volatile matter N1, and the gas filling device 505 is controlled to stop filling.

[0081] After measuring the initial volatile organic compound (VOC) concentration N1, the gas inlet 508 and sampling port 509 are closed, and the vacuum port 507 is opened. The vacuum device 504 evacuates the internal space of the vacuum chamber 501 via the vacuum port 507. During the vacuuming operation, the VOC concentration and the size data of the tested battery are monitored. For example, if the tested battery expands during the vacuuming process, it will push the cover plate 403 in the measuring component 202 to move along the guide direction provided by the guide. At this time, the cover plate 403 will drive the slider of the sliding variable resistor component 201 to move upwards, and the carbon brush 405 in the slider will move relative to the resistor column 404, thereby changing the resistance value in the detection circuit formed by the slider and one end of the resistor column 404. Thus, the measurement conversion unit 203 can detect the size change of the tested battery based on the change in the input resistance value. A corresponding database of input resistance values ​​and tested battery size values ​​can be established through pre-testing and calculation. After measuring the input resistance value, the size value of the tested battery can be obtained by looking up the table.

[0082] Once the pressure inside the vacuum chamber 501 drops to a preset pressure threshold, vacuuming can be stopped and the vacuum port 507 closed, creating a completely sealed space within the vacuum chamber 501. After stopping vacuuming, the vacuum chamber 501 can be kept completely sealed for a preset time before collecting the final size data D2 of the battery under test and the final concentration of volatile organic compounds (VOCs) N2 in the gas discharged from the vacuum port 507. Setting the pressure threshold prevents damage to the battery under test due to excessively low pressure inside the vacuum chamber 501. Maintaining the battery under test in a vacuum state for a preset time helps stabilize its size changes and ensures that the concentration of VOCs within the vacuum chamber 501 stabilizes after vacuuming.

[0083] The control module 104 can calculate the difference between the final size data D2 and the initial size data D1 according to the first formula D0 = D2 - D1. The obtained difference is the change in size data DO of the tested battery during the vacuuming operation. The control module 104 can also calculate the difference between the final volatile organic compound (VOC) concentration N2 and the initial VOC concentration N1 according to the second formula N0 = N2 - N1. The obtained difference is the change in VOC concentration N0 of the tested battery during the vacuuming operation. Furthermore, the control module 104 can compare the change in VOC concentration N0 and the change in size data D0 with their corresponding set thresholds. If both the change in VOC concentration N0 and the change in size data D0 are less than their corresponding set thresholds, it can be determined that the tested battery has not experienced a leakage fault. If the change in volatile organic compound (VOC) concentration, N0, is less than its corresponding set threshold, while the change in dimensional data, D0, reaches or exceeds its corresponding set threshold, it indicates that the leakage in the tested battery is within the normal range. However, if the tested battery still deforms, it can be determined that there is excessive gas inside the tested battery, indicating an excessive gas storage fault. When the external air pressure decreases, the pressure difference between the inside and outside of the tested battery increases, and the battery with excessive gas storage will expand due to the support of its internal gas. If both the change in VOC concentration, N0, and the change in dimensional data, D0, reach or exceed their corresponding set thresholds, it indicates that the tested battery has leaked. Some organic gas cannot escape from the tested battery in time, leading to an increase in the pressure difference between the inside and outside of the tested battery, which in turn causes the tested battery to expand, causing the change in VOC concentration, N0, to reach or exceed the set threshold. In this case, it can be seen that the leakage of the outer layer of the tested battery is smaller, while the leakage of the inner layer is larger. If the change in VOC concentration, N0, reaches or exceeds its corresponding set threshold, while the change in dimensional data, D0, is less than its corresponding set threshold, it indicates that the leakage of the tested battery is very large.

[0084] The environmental adjustment operation implemented by the environmental adjustment module in the battery leakage detection device provided in this embodiment of the invention also includes a gas filling operation. The operation of filling the detection environment with filling gas before vacuuming can ensure the consistency of the initial organic volatile concentration in the detection environment for each detection, prevent the influence of residual gas from the previous detection on the current detection, and improve the accuracy of battery leakage detection results.

[0085] Example 6

[0086] This invention also provides a battery leakage detection method, which can be applied to any of the aforementioned battery leakage detection devices. Figure 7 This is a flowchart illustrating a battery leakage detection method provided in an embodiment of the present invention. Based on any of the foregoing embodiments, refer to... Figure 7 Battery leakage detection methods include:

[0087] S701, Perform environmental adjustment operations on the detection space.

[0088] Specifically, environmental adjustment operation refers to the monitoring and adjustment of environmental parameters within the testing space. These parameters may include air pressure, temperature, humidity, and the concentration of volatile organic compounds. For example, environmental adjustment operation may include vacuuming. During the testing process, the environmental adjustment module can utilize a vacuuming device to evacuate the testing space and adjust the air pressure of the environment surrounding the battery under test.

[0089] S702. During the environmental adjustment operation, measure the concentration of volatile organic compounds in the detection space.

[0090] Specifically, during the environmental adjustment process, an organic volatile matter (EVM) detection module is used to detect the concentration of EVMs in the gas within the detection space where the battery under test is located. The detection frequency of EVM concentration can be real-time, at preset time intervals, or at various preset time points; no restrictions are placed here. During the process of the environmental adjustment module evacuating the detection space and during other environmental adjustment operations before and after (such as gas filling before evacuation or sealing and settling after evacuation), the EVM detection module can detect the concentration of EVMs within the detection space. For example, the EVM detection module may include an EVM detector, which can be used to sample the concentration of EVMs in the gas extracted by the vacuuming device in real time during the evacuation process.

[0091] S703. During the environmental adjustment operation, the size data of the battery under test is measured using the principle of sliding resistance.

[0092] Specifically, during the environmental adjustment process, a size detection module is used to measure the size of the battery under test in the detection space based on the principle of a sliding rheostat. The frequency of size detection can be real-time, at preset time intervals, or at various preset time points; no restrictions are placed here. During the vacuuming process of the detection space and other environmental adjustment operations before and after, the size detection module can convert the size change of the battery under test into the resistance change in the circuit connected to the sliding rheostat. Then, by measuring the resistance of the circuit connected to the sliding rheostat, real-time sampling of the size data of the battery under test is achieved. For example, the size detection module may include a sliding rheostat, a positional component, and a converter. The positional component is located within the detection space, connected to the outer surface of the battery under test, and moved as the size of the battery changes. The positional component is also connected to the slider of the sliding rheostat. As the size of the battery under test changes, the positional component can also move the slider on the resistive body, causing the resistance at both ends of the converter to change with the size of the battery under test. The converter can convert the measured resistance value into the size data of the battery under test according to a preset program, enabling real-time measurement of the battery's size. The use of a sliding rheostat for size measurement eliminates the need for the battery to be removed from the testing space, avoiding measurement errors caused by the battery's size rebound after being removed from the testing space, thus improving the reliability of the test.

[0093] S704. By combining the changes in the concentration of volatile organic compounds in the detection space during the vacuuming operation with the changes in the size data of the tested battery, the leakage detection result of the tested battery is determined.

[0094] Specifically, during the environmental adjustment process, the control module can receive the volatile organic compound (VOC) concentration data output by the VOC detection module and the size data output by the size detection module, and preprocess the data. For example, preprocessing may include outlier removal, correction, and conversion, and may also include the selection of target data. Then, based on the preprocessed VOC concentration and size data, the control module can determine the change in VOC concentration and the change in the size data of the tested battery within the detection space during the vacuuming operation. Furthermore, combining the changes in VOC concentration and size data within the detection space during the vacuuming process, the control module determines the leakage detection result of the tested battery. For example, the control module can determine the leakage detection result of the tested battery based on the relative relationship between the changes in VOC concentration and size data and their corresponding set thresholds. For instance, if neither the change in VOC concentration nor the change in size data exceeds the corresponding set threshold, it is determined that the tested battery has not leaked.

[0095] In the battery leakage detection method provided in this embodiment, an environmental adjustment operation is performed on the detection space. During the environmental adjustment operation, the concentration of volatile organic compounds (VOCs) in the detection space is measured. During the environmental adjustment operation, the size data of the battery under test is measured using the principle of sliding rheostat. By combining the changes in the concentration of VOCs in the detection space and the changes in the size data of the battery under test during the vacuuming operation, the leakage detection result of the battery under test is determined. This method combines VOC detection and size measurement to achieve battery leakage detection. On the one hand, by using the sliding rheostat principle to measure the battery size, the size measurement does not leave the vacuum environment, avoiding the influence of air pressure changes on the size of the battery under test, thus improving the reliability of the detection results. On the other hand, the comprehensive analysis method combining the two detection methods can prevent the influence of accidental factors on the detection results, further improving the reliability of the detection results.

[0096] Example 7

[0097] Figure 8 This is a schematic flowchart of another battery leakage detection method provided by an embodiment of the present invention. Based on any of the foregoing embodiments, refer to... Figure 8 Battery leakage detection methods include:

[0098] S801, Perform environmental adjustment operations on the detection space.

[0099] S802. During the environmental adjustment operation, measure the concentration of volatile organic compounds in the detection space.

[0100] S803. During the environmental adjustment operation, the size data of the battery under test is measured using the principle of sliding resistance.

[0101] Steps S801, S802, and S803 correspond one-to-one with steps S701, S702, and S703 in the aforementioned embodiments and have the same content, so they will not be repeated here.

[0102] S804. Based on the initial and final concentrations of volatile organic compounds (VOCs) in the detection space, determine the change in VOC concentration during the vacuuming operation.

[0103] Specifically, the initial volatile organic compound (VOC) concentration refers to the VOC concentration in the detection space before the vacuuming operation. This concentration can be detected using a VOC detection module. For example, if the environmental adjustment operation includes vacuuming but not gas filling, the initial VOC concentration can be the VOC concentration in the detection space before the vacuuming operation begins. Alternatively, if the environmental adjustment operation includes both vacuuming and gas filling, the gas filling operation is performed before the vacuuming operation to introduce purified filling gas into the detection space. The VOC concentration in this filling gas is extremely low, eliminating the influence of gases generated in the previous detection on the current detection. In this case, the initial VOC concentration can be the VOC concentration in the detection space collected between the end of the gas filling operation and the start of the vacuuming operation. The final volatile organic compound (VOC) concentration refers to the VOC concentration in the detection space after vacuuming. This concentration can be detected using a VOC detection module. For example, the final VOC concentration can be the concentration detected by the VOC detection module at the end of the vacuuming operation, or it can be the concentration detected by the VOC detection module after the pressure in the detection space has been maintained for a preset time after the vacuuming operation. Based on the difference between the final VOC concentration and the initial VOC concentration in the detection space, the change in VOC concentration during the vacuuming operation can be determined.

[0104] S805. Based on the initial and final size data of the battery under test, determine the amount of change in the size data of the battery under test during the vacuuming operation.

[0105] Specifically, the initial size data refers to the original size data of the battery under test before vacuuming, which can be detected using a size detection module. For example, the initial size data can be the size data measured by the size detection module after the battery is placed in the testing space and before the vacuuming operation begins; it can be any of the battery's height, width, length, and volume. The final size data refers to the size data of the battery under test in the testing space under low pressure after the vacuuming operation. For example, the final size data can be the size data of the battery under test detected by the size detection module at the end of the vacuuming operation, or it can be the size data of the battery under test detected by the size detection module after the pressure in the testing space has been maintained for a preset time after the vacuuming operation. Based on the difference between the final size data and the initial size data of the battery under test, the amount of change in the size data of the battery under test during the vacuuming operation can be determined.

[0106] S806. Compare the changes in volatile organic compound concentration and size data with their corresponding set thresholds.

[0107] Specifically, the set threshold corresponding to the change in volatile organic compound (VOC) concentration refers to the upper limit of the normal concentration range of VOC concentration in the tested battery during vacuuming. The normal concentration range corresponding to the VOC concentration of the tested battery can be determined based on multiple sets of experimental data from several normal batteries and batteries with varying degrees of leakage during vacuuming tests. The pressure achieved during the vacuuming test is the same as the pressure level required for the vacuuming operation in this application. Once the change in VOC concentration exceeds the set threshold, it indicates that the VOC leakage from the tested battery during vacuuming exceeds the normal range, and the VOC concentration can indicate the degree of leakage.

[0108] The set threshold corresponding to the change in dimensional data refers to the upper limit of the normal dimensional range corresponding to the dimensional data of the battery under test during the vacuuming operation. The normal dimensional range corresponding to the dimensional data of the battery under test can be determined based on multiple sets of experimental data from multiple normal batteries and batteries with different degrees of leakage during vacuuming tests. The gas pressure reached in the vacuuming test is the same as the gas pressure level required for the vacuuming operation in this application. Once the change in the dimensional data of the battery under test exceeds the set threshold, it indicates that the deformation of the battery under test during the vacuuming operation exceeds the normal range, and the change in the dimensional data of the battery under test can indicate the degree of leakage.

[0109] S807. If the changes in the concentration of volatile organic compounds and the changes in the size data do not exceed their corresponding set thresholds, it is determined that the tested battery has not leaked.

[0110] S808. If the change in the concentration of volatile organic compounds does not exceed its corresponding set threshold, but the change in the size data exceeds its corresponding set threshold, the tested battery is determined to have excessive gas.

[0111] S809. If the change in the concentration of volatile organic compounds exceeds its corresponding set threshold, it is determined that the tested battery is leaking.

[0112] Specifically, if the changes in the concentration of volatile organic compounds and the changes in size data are both less than their corresponding set thresholds, it indicates that the tested battery has not leaked.

[0113] If the change in volatile organic compound (VOC) concentration is less than its corresponding set threshold, while the change in dimensional data is greater than or equal to its corresponding set threshold, it indicates that the amount of organic gas leakage in the tested battery is within the set range. However, if the tested battery still deforms, it can be determined that there is excessive gas inside the tested battery (excessive gas storage). During the vacuuming operation, the external air pressure of the battery decreases, increasing the pressure difference between the inside and outside of the battery with excessive gas storage. The tested battery expands due to the internal air pressure. This type of gas storage fault is not a leakage fault, but it still increases the risk of the tested battery. It can be identified and indicated to facilitate appropriate handling by the testing personnel.

[0114] There are two scenarios when a battery under test experiences leakage: First, if both the change in volatile organic compound (VOC) concentration and the change in dimensional data are greater than or equal to their respective set thresholds, it indicates leakage. Some of the leaked organic gases cannot escape the battery in time, leading to an increase in the pressure difference between the inside and outside of the battery. This causes the battery to expand, resulting in a VOC concentration change exceeding the set range. In this case, the leakage in the outer layer of the battery is relatively small, while the leakage in the inner layer is relatively large. Second, if the change in VOC concentration is greater than or equal to its corresponding set threshold, but the change in dimensional data is less than its corresponding set threshold, it indicates a larger leakage in the battery.

[0115] The battery leakage detection method provided in this invention determines the change in volatile organic compound (VOC) concentration within the detection space during a vacuuming operation based on the initial and final VOC concentrations within the detection space. It also determines the change in the battery's dimensions during the vacuuming operation based on the initial and final dimension data of the battery under test. Both the change in VOC concentration and the change in dimensions are compared to their corresponding set thresholds. If neither the change in VOC concentration nor the change in dimensions exceeds its corresponding set threshold, the battery under test is determined not to be leaking. If the change in VOC concentration exceeds its corresponding set threshold, the battery under test is determined to be leaking. If the change in volatile organic compound (VOC) concentration does not exceed its corresponding set threshold, but the change in dimensional data exceeds its corresponding set threshold, the tested battery is determined to have excessive gas. On the one hand, by comparing the difference between the initial and final dimensions, the change in the size of the tested battery during the vacuuming operation can be judged, which can eliminate the size differences between different battery models and broaden the application range of the detection device. On the other hand, by analyzing the VOC concentration and dimensional data, the identification of batteries with excessive gas is realized, expanding the detection items for faulty batteries and improving the safety of batteries leaving the factory.

[0116] Example 8

[0117] Figure 9 This is a flowchart illustrating a method for detecting the severity of leakage according to an embodiment of the present invention. This method can be incorporated into the battery leakage detection methods of any of the foregoing embodiments after determining the leakage detection result of the tested battery, and is used for verifying the detection result and determining the severity. Based on any of the foregoing embodiments, combined with... Figure 8 and Figure 9 Methods for detecting the severity of leakage include:

[0118] S901. If the leakage detection results show that the tested battery is leaking, re-evacuate and measure the concentration of volatile organic compounds and the size data of the tested battery in the detection space.

[0119] Specifically, if the leakage detection results show that the tested battery is leaking, and it is necessary to obtain the severity of the leakage or to re-examine the detection results (also known as inspection), the vacuum can be re-evacuated and the concentration of volatile organic compounds and the size data of the tested battery in the detection space can be measured. For example, steps S701, S702, S703 and S704 in the aforementioned embodiments can be repeated to readjust the environment and obtain the change in the concentration of volatile organic compounds and the change in the size data of the tested battery in the detection space during a vacuuming operation.

[0120] S902. Calculate the leakage index of the tested battery based on the initial volatile organic compound concentration, final volatile organic compound concentration, initial size data, and final size data during the two vacuuming operations.

[0121] Specifically, the leakage index of the tested battery refers to data reflecting the degree of leakage of the tested battery. A higher leakage index indicates a higher degree of leakage. If the initial size data obtained in the previous test is D11, the initial volatile organic compound (VOC) concentration obtained in the previous test is N11, the final VOC concentration obtained in the previous test is N21, the final size data obtained in the previous test is D21, the change in VOC concentration obtained in the previous test is N0, and the change in size data obtained in the previous test is D0; if the initial size data obtained in the subsequent test is D12, the initial VOC concentration obtained in the subsequent test is N12, the final VOC concentration obtained in the subsequent test is N22, and the final size data obtained in the subsequent test is D22, the set threshold corresponding to the change in VOC concentration is n0, and the set threshold corresponding to the change in size data is d0. Based on the initial volatile organic compound (VOC) concentration N11 obtained from the previous test, the initial VOC concentration N12 obtained from the subsequent test, the final VOC concentration N21 obtained from the previous test, the final VOC concentration N22 obtained from the subsequent test, and the set threshold n0 corresponding to the change in VOC concentration, the concentration correction index n is calculated according to the third formula n = (N11 + N12 + N21 + N22) / 4n0. Based on the initial dimensional data D11 obtained from the previous test, the initial dimensional data D12 obtained from the subsequent test, the final dimensional data D21 obtained from the previous test, the final dimensional data D22 obtained from the subsequent test, and the set threshold d0 corresponding to the change in dimensional data, the dimensional correction index d is calculated according to the fourth formula d = (D11 + D12 + D21 + D22) / 4d0. Based on the change in volatile organic compound (VOC) concentration N0 obtained from the previous test and the corresponding set threshold n0, the concentration judgment index n1 is calculated according to the fourth formula n1 = (N0 - n0) / n0. Based on the change in dimensional data D0 obtained from the previous test and the corresponding set threshold d0, the dimensional judgment index d1 is calculated according to the fifth formula d1 = (D0 - d0) / d0. Finally, based on the concentration judgment index n1, the change in VOC concentration N0 obtained from the previous test, the concentration correction index n, the corresponding set threshold n0, the dimensional judgment index d1, the change in dimensional data D0 obtained from the previous test, the dimensional correction index d, and the corresponding set threshold d0, the leakage index X is calculated according to the sixth formula X = [n1(n1*N0 / n-n0)+d1(d1*D0 / d-d0)] / (N0+D0).

[0122] S903. Determine the verification result of leakage detection based on the relative relationship between the leakage index and its corresponding set threshold.

[0123] Specifically, the set threshold corresponding to the leakage index is the upper limit of the reasonable range of the leakage index of a normal battery. For example, the set threshold corresponding to the leakage index can be determined based on multiple sets of experimental data from vacuum tests on multiple normal batteries and batteries with different degrees of leakage faults, ensuring that the leakage index of the normal tested battery is always less than the set threshold. Based on the relative relationship between the leakage index and its corresponding set threshold, the secondary leakage detection result of the tested battery can be determined. For example, if the leakage index exceeds its corresponding set threshold, the secondary leakage detection result can be determined as leakage occurring; otherwise, it is determined as no leakage occurring. Then, the secondary leakage detection result is compared with the previous leakage detection result. If the two leakage detection results are the same, the verification result can be determined as consistent. If the two leakage detection results are different, the verification result can be determined as inconsistent.

[0124] S904. If the verification results are consistent, the leakage index indicates the severity of leakage of the tested battery.

[0125] Specifically, the leakage index reflects the severity of leakage in the tested battery. When the verification results are consistent, the leakage index can be used to indicate the severity of leakage. For example, the severity of leakage can be indicated either by directly displaying the leakage index or by determining the severity based on the index and displaying the result. The severity determination can include minor leakage, moderate leakage, and severe leakage. Indicating the severity of leakage facilitates appropriate action by testing personnel, improving the efficiency of testing and handling.

[0126] The battery leakage detection device and method provided by this invention include an environmental adjustment module for evacuating the detection space. An organic volatile matter (EVM) detection module measures the concentration of EVMs within the detection space during the evacuation process. A size detection module measures the size of the battery under test using the principle of sliding rheostat during the evacuation process. A control module is connected to both the EVM and size detection modules. The control module combines the changes in EVM concentration and size of the battery under test during the evacuation process to determine the leakage detection result. This combined approach of EVM and size detection achieves battery leakage detection. On one hand, by using the sliding rheostat principle to measure battery size within a vacuum environment, the influence of pressure changes on the battery size is avoided, improving the reliability of the detection results. On the other hand, the integrated analysis combining the two detection methods prevents the influence of random factors on the detection results, further enhancing their reliability.

[0127] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0128] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A battery leakage detection device, characterized in that, include: Environmental adjustment module, volatile organic compound detection module, size detection module, and control module; The environmental adjustment module is used to perform environmental adjustment operations on the detection space, wherein the environmental adjustment operations include a vacuuming operation, and the detection space includes the space inside a vacuum chamber; The volatile organic compound (VOC) detection module is used to measure the concentration of VOCs in the detection space during the environmental adjustment operation. The size detection module is used to measure the size data of the battery under test during the environmental adjustment operation using the principle of sliding resistance. The size detection module includes a sliding resistance component, a measuring component, and a measurement conversion unit. Both the sliding resistance component and the measuring component are disposed within the detection space. The sliding resistance component includes a slider. The measuring component is disposed on the battery placement position, close to the battery under test, and is also connected to the slider of the sliding resistance component. The measuring component is used to move the slider within its range as the volume of the battery under test increases or decreases. The measurement conversion unit is connected to both the sliding resistance component and the control module. The measurement conversion unit is used to convert the input resistance of the sliding resistance component into the size data of the battery under test and report it to the control module. The control module is connected to the volatile organic compound detection module and the size detection module respectively. The control module is used to determine the leakage detection result of the battery under test by combining the change in the concentration of volatile organic compounds in the detection space and the change in the size data of the battery under test during the vacuuming operation.

2. The battery leakage detection device according to claim 1, characterized in that, The measuring component includes a guide and a contact. The guide is slidably connected to the contact and provides a guiding direction for the contact. The contact is in close contact with the surface of the battery under test and is also connected to the sliding member. The contact is used to move the sliding member a corresponding distance along the guiding direction according to the volume change of the battery under test.

3. The battery leakage detection device according to claim 2, characterized in that, The guide includes at least one guide post arranged in the same direction, the guide post being erected next to the battery placement position; the contact includes a cover plate, the cover plate being provided with guide holes corresponding to the guide posts; the guide holes are sleeved on their corresponding guide posts, for limiting the cover plate to move only along the extension direction of the central axis of the guide post.

4. The battery leakage detection device according to claim 2, characterized in that, The sliding rheostat assembly further includes a resistor column; the sliding element includes a carbon brush and a conductor connector. The resistor post is disposed on one side of the battery placement position, and the extension direction of the central axis of the resistor post is the same as the guide direction; the carbon brush is slidably connected to the resistor post, so that the carbon brush can only slide along the extension direction of the resistor post; one end of the conductor connector is fixedly connected to the carbon brush, and the other end is fixedly connected to the contact.

5. The battery leakage detection device according to claim 4, characterized in that, The conductor connector includes an elastic element that provides pressure to the carbon brush against the resistor post, ensuring full contact between the carbon brush and the side of the resistor post.

6. A method for detecting battery leakage, characterized in that, The battery leakage detection method is implemented by any one of the battery leakage detection devices according to claims 1-5, and includes: An environmental adjustment operation is performed on the detection space, wherein the environmental adjustment operation includes a vacuuming operation; During the environmental adjustment operation, the concentration of volatile organic compounds in the detection space is measured; During the environmental adjustment operation, the dimensional data of the battery under test are measured using the principle of sliding rheostat. By combining the changes in the concentration of volatile organic compounds in the detection space and the changes in the size data of the battery under test during the vacuuming operation, the leakage detection result of the battery under test is determined.

7. The battery leakage detection method according to claim 6, characterized in that, By combining the changes in the concentration of volatile organic compounds in the detection space during the vacuuming operation and the changes in the dimensional data of the battery under test, the leakage detection result of the battery under test is determined, including: Based on the initial and final volatile organic compound (VOC) concentrations within the detection space, the change in VOC concentration within the detection space during the vacuuming operation is determined. The initial VOC concentration is the concentration of VOCs in the overflow gas collected at the sampling port when the gas filling process of the vacuum chamber before vacuuming stops. The final VOC concentration is the concentration of VOCs in the gas discharged from the vacuum port after the vacuuming process stops, while the vacuum chamber remains completely sealed for a preset time. Based on the initial and final size data of the battery under test, the change in the size data of the battery under test during the vacuuming operation is determined. The initial size data is the size data of the battery under test detected after the battery under test is placed in the vacuum chamber and before the vacuum chamber is sealed. The final size data is the size data of the battery under test collected after the vacuuming is stopped, while the vacuum chamber is kept completely sealed and maintained for a preset time. The changes in the concentration of volatile organic compounds and the changes in the size data are compared with their corresponding set thresholds. If neither the change in the concentration of volatile organic compounds nor the change in the size data exceeds its corresponding set threshold, it is determined that the tested battery has not leaked. If the change in the concentration of volatile organic compounds exceeds its corresponding set threshold, it is determined that the tested battery is leaking.

8. The battery leakage detection method according to claim 7, characterized in that, After comparing the changes in the concentration of volatile organic compounds and the changes in the size data with their corresponding set thresholds, the method further includes: If the change in the concentration of volatile organic compounds does not exceed its corresponding set threshold, but the change in the size data exceeds its corresponding set threshold, the tested battery is determined to have excessive gas.

9. The battery leakage detection method according to claim 7 or 8, characterized in that, After determining the leakage detection result of the tested battery, the process also includes: If the leakage detection result indicates that the tested battery is leaking, the vacuuming operation is repeated and the concentration of volatile organic compounds and the size data of the tested battery in the detection space are measured. The leakage index of the tested battery is calculated based on the initial volatile organic compound concentration, the final volatile organic compound concentration, the initial size data, and the final size data during the two vacuuming operations. The verification result of the leakage detection is determined based on the relative relationship between the leakage index and its corresponding set threshold. If the verification results are consistent, the leakage index indicates the severity of leakage in the tested battery.

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