Battery liquid leakage detection device and detection method

Abstract

The invention discloses a battery liquid leakage detection device and method, and in the detection device, an environment adjustment module carries out environment adjustment operation on a detection space. In the environment adjustment process, the organic volatile matter detection module measures the concentration of the organic volatile matter in the detection space, and the size detection module measures the size data of the detected battery according to the sliding variable resistance principle. The control module is respectively connected with the organic volatile matter detection module and the size detection module and is used for determining a liquid leakage detection result of the detected battery by combining the variation of the concentration of the organic volatile matter in the detection space and the variation of the size data of the detected battery in the vacuumizing operation process; liquid leakage detection of the battery is realized by combining organic volatile matter detection and size detection, on one hand, the size of the battery is measured by using a sliding variable resistance principle, and the influence of air pressure change on the size of the detected battery is avoided; on the other hand, the reliability of the detection result is improved through a comprehensive analysis mode combining the two detection modes.

Description

Technical Field

[0001] The present invention relates to the field of battery detection, and in particular to a battery leakage detection device and a detection method. Background Art

[0002] As one of the core components of new energy vehicles, power battery technology innovations are endless. Power battery leakage detection technology also occupies a very important position in the production process.

[0003] The electrolyte of a damaged battery will come into contact with moisture in the air and generate hydrofluoric acid. The power batteries of new energy vehicles usually operate under high voltage. Once hydrofluoric acid penetrates into the battery, it may damage the battery structure and cause serious consequences.

[0004] In the prior art, VOC detection method or size detection method is commonly used to detect whether the power battery has leakage defects. The VOC detection method determines whether the battery is leaking by detecting the concentration of volatile organic compounds, but the detection results are easily interfered with and the false detection rate is high. The size detection method determines whether the battery is leaking based on the change in battery size during the vacuuming process, but each test requires the battery to be taken out of the vacuum chamber for size measurement before and after vacuuming, and the battery size rebound will cause inaccurate detection. Summary of the invention

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

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

[0007] The environment adjustment module is used to perform an environment adjustment operation on the detection space, wherein the environment adjustment operation includes a vacuuming operation;

[0008] The organic volatile matter detection module is used to measure the concentration of organic volatile matter in the detection space during the environment adjustment operation;

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

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

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

[0012] The sliding variable resistance component and the level measuring component are both arranged in the detection space; the sliding variable resistance component includes a sliding part; the level measuring component is arranged on the battery placement position close to the battery to be inspected, and is also connected to the sliding part of the sliding variable resistance component; the level measuring component is used to drive the sliding part to move correspondingly within the range of the measuring range as the volume of the battery to be inspected increases or decreases;

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

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

[0015] The sliding variable resistance assembly and the position measuring assembly are both arranged in the detection space; the sliding variable resistance assembly includes a sliding member; the position measuring assembly includes a guide member and a contact member, the guide member is slidably connected to the contact member, and the guide member is used to provide a guiding direction for the contact member; the contact member is closely attached to the surface of the battery under inspection and is also connected to the sliding member, and the contact member is used to drive the sliding member to move a corresponding distance along the guiding direction according to the volume change of the battery under inspection;

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

[0017] Optionally, the guide member includes at least one guide column arranged in the same direction, and the guide column is upright next to the battery placement position; the contact member includes a cover plate, and the cover plate is provided with guide holes corresponding to the guide columns one by one; the guide holes are sleeved on the corresponding guide columns, and are used to limit the cover plate to move only along the extension direction of the central axis of the guide column.

[0018] Optionally, the sliding variable resistance assembly further includes a resistance column; the sliding member includes a carbon brush and a conductor connector;

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

[0020] Optionally, the conductor connector includes an elastic member, and the elastic member is used to provide pressure for the carbon brush to press against the resistor column, so that the carbon brush is in full contact with the side surface of the resistor column.

[0021] According to another aspect of the present invention, a battery leakage detection method is provided. The battery leakage detection method is implemented by any of the battery leakage detection devices described in the previous aspect. The battery leakage detection method comprises:

[0022] Performing an environmental adjustment operation on the detection space, wherein the environmental adjustment operation includes a vacuuming operation;

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

[0024] During the environmental adjustment operation, the dimension data of the battery under inspection is measured by using the sliding resistance principle;

[0025] The leakage detection result of the battery under inspection is determined by combining the change in the concentration of the volatile organic matter in the detection space and the change in the size data of the battery under inspection during the vacuuming operation.

[0026] Optionally, determining the leakage detection result of the battery under test by combining the change in the concentration of the volatile organic matter in the detection space and the change in the size data of the battery under test during the vacuuming operation includes:

[0027] Determining a change in the concentration of the volatile organic matter in the detection space during the vacuuming operation according to the initial concentration of the volatile organic matter and the final concentration of the volatile organic matter in the detection space;

[0028] Determining a change in the size data of the battery under inspection during the vacuuming operation according to the initial size data and the final size data of the battery under inspection;

[0029] Comparing the change in the concentration of the volatile organic matter and the change in the size data with their corresponding set thresholds respectively;

[0030] When the change in the concentration of the volatile organic matter and the change in the size data do not exceed their corresponding set thresholds, determining that the inspected battery has no leakage;

[0031] When the change in the concentration of the volatile organic matter exceeds a corresponding set threshold, it is determined that the battery under inspection has leaked.

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

[0033] When the change in the concentration of the volatile organic matter does not exceed the corresponding set threshold but the change in the size data exceeds the corresponding set threshold, it is determined that the inspected battery has excessive gas storage.

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

[0035] When the leakage detection result shows that the inspected battery is leaking, re-performing the vacuuming operation and measuring the concentration of the volatile organic matter in the detection space and the size data of the inspected battery;

[0036] Calculating the leakage index of the inspected battery according to the initial organic volatile concentration, the final organic volatile concentration, the initial size data and the final size data during the two vacuuming operations;

[0037] Determining the review result of the leakage detection according to the relative relationship between the leakage index and the corresponding set threshold value;

[0038] When the review result is consistent, the leakage severity of the inspected battery is indicated according to the leakage index.

[0039] The battery leakage detection device and detection method provided in this embodiment are provided with an environment adjustment module, an organic volatile detection module, a size detection module and a control module in the detection device. The environment adjustment module is used to perform environmental preparation operations on the detection space. The organic volatile detection module is used to measure the concentration of organic volatiles in the detection space during the environmental preparation process. The size detection module is used to measure the size data of the battery under test by using the sliding variable resistance principle during the environmental preparation process. The control module is connected to the organic volatile 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 organic volatiles in the detection space during the vacuuming process and the change in the size data of the battery under test. The battery leakage detection is realized by combining the organic volatile detection and the size detection. On the one hand, the battery size is measured by using the sliding variable resistance principle, and the size measurement does not leave the vacuum environment, thereby avoiding the influence of the air pressure change on the size of the battery under test; on the other hand, the comprehensive analysis method combining the two detection methods can prevent the influence of accidental factors on the detection results, thereby greatly improving the reliability of the detection results.

[0040] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

[0043] Figure 2 A schematic diagram of another battery leakage detection device provided by an embodiment of the present invention;

[0044] Figure 3 A schematic diagram of the composition of another battery leakage detection device provided by an embodiment of the present invention;

[0045] Figure 4 A schematic diagram of the structure of a sliding resistance component and a position measuring component provided in an embodiment of the present invention;

[0046] Figure 5 A schematic diagram of the structure of another battery leakage detection device provided by an embodiment of the present invention;

[0047] Figure 6 A schematic diagram of the composition of another battery leakage detection device provided by an embodiment of the present invention;

[0048] Figure 7 A schematic diagram of a flow chart of a battery leakage detection method provided by an embodiment of the present invention;

[0049] Figure 8 A schematic diagram of a flow chart of another battery leakage detection method provided by an embodiment of the present invention;

[0050] Fig. 9 A schematic flow chart of a method for detecting the severity of a liquid leakage provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0053] Embodiment 1

[0054] In order to solve the problem mentioned in the background technology, an embodiment of the present invention provides a battery leakage detection device. Figure 1 This is a schematic diagram of the composition of a battery leakage detection device provided by an embodiment of the present invention, in which the connection relationship between the environment adjustment module and other modules is omitted. Figure 1 The battery leakage detection device 100 includes an environment adjustment module 101, an organic volatile detection module 102, a size detection module 103 and a control module 104. The environment adjustment module 101 is used to provide a detection space for the battery under test and perform an environment adjustment operation on the detection space, wherein the environment adjustment operation includes a vacuuming operation. The organic volatile detection module 102 measures the concentration of organic volatiles in the detection space during the environment adjustment operation. The size detection module 103 is used to measure the size data of the battery under test by using the sliding resistance principle during the environment adjustment operation. The control module 104 is connected to the organic volatile detection module 102 and the size detection module 103 respectively, and the control module 104 is used to determine the leakage detection result of the battery under test by combining the change in the concentration of organic volatiles in the detection space during the vacuuming operation and the change in the size data of the battery under test.

[0055] Specifically, the environment adjustment module 101 refers to a multifunctional integrated component that can provide a closed detection space for the battery under test and monitor and adjust the environmental parameters in the detection space. The environmental parameters may include air pressure, temperature, humidity, and environmental concentration of organic volatiles. For example, the environment adjustment module 101 may include a vacuum chamber, a vacuum pumping device connected to the inside of the vacuum chamber, and an air pressure sensor disposed in the vacuum chamber. During the detection process, the environment adjustment module 101 can use the vacuum pumping device to vacuum the detection space and adjust the air pressure of the environment in which the battery under test is located by vacuuming.

[0056] The organic volatile detection module 102 refers to a detection component that detects the organic volatile concentration of the gas in the detection space where the detected battery is located. The organic volatile detection module 102 can be connected to the environment adjustment module 101. During and before and after the environment adjustment module 101 vacuumizes the detection space, the organic volatile detection module 102 can detect the organic volatile concentration in the detection space. Exemplarily, the organic volatile detection module 102 can include an organic volatile detector, which can be connected to the vacuum port of the vacuum chamber via a vacuum device. During the process of the environment adjustment module 101 vacuumizing the detection space, the organic volatile detector can perform real-time sampling of the organic volatile concentration of the gas extracted by the vacuum device.

[0057] The size detection module 103 refers to a measuring component that uses the sliding rheostat principle to measure the size of the battery under test in the detection space. In the process of evacuating the detection space and before and after, the size detection module 103 can convert the size change of the battery under test into the change of resistance in the circuit connected to the sliding rheostat, and then realize the real-time sampling of the size data of the battery under test by measuring the resistance of the circuit connected to the sliding rheostat. Exemplarily, the size detection module 103 may include a sliding rheostat, a position measuring component and a converter, and the position measuring component is arranged in the detection space, connected to the outer surface of the battery under test and driven as the size of the battery under test changes. The position measuring component is also connected to the slider of the sliding rheostat. As the size of the battery under test changes, the position measuring component can also drive the slider to slide on the resistor body, so that the resistance at both ends of the converter changes 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 the preset program, and realize the real-time measurement of the size of the battery under test. The method of using the sliding variable resistance principle to measure the size of the battery under test does not require it to leave the detection space, thus avoiding measurement errors caused by the rebound of the size of the battery under test after leaving the detection space, and improving the reliability of detection.

[0058] The control module 104 is the data analysis and processing center of the battery leakage detection device 100. For example, the control module 104 may include a single chip microcomputer, a microprocessor chip, a server or a processor, etc., which has data storage, processing and analysis. The control module 104 is connected to the organic volatile detection module 102 and the size detection module 103 respectively. During the vacuuming process, the control module 104 can receive the organic volatile concentration output by the organic volatile detection module 102 and the size data output by the size detection module 103, and pre-process the data. For example, the pre-processing may include the removal, correction and conversion of abnormal values, and may also include the selection of target data. Then the control module 104 can determine the change in the organic volatile concentration in the detection space and the change in the size data of the battery under test during the vacuuming operation based on the pre-processed organic volatile concentration and size data. Then the control module 104 combines the change in the organic volatile concentration in 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. Exemplarily, the control module 104 can determine the leakage detection result of the inspected battery according to the relative relationship between the change in the concentration of the volatile organic matter and the change in the size data and their corresponding set thresholds. For example, when the change in the concentration of the volatile organic matter and the change in the size data do not exceed the corresponding set thresholds, it is determined that the inspected battery has no leakage.

[0059] The battery leakage detection device provided in this embodiment is provided with an environment adjustment module, an organic volatile detection module, a size detection module and a control module. The environment adjustment module is used to perform environment adjustment operations on the detection space. The organic volatile detection module is used to measure the concentration of organic volatiles in the detection space during the environment adjustment process. The size detection module is used to measure the size data of the battery under test by using the sliding resistance principle during the environment adjustment process. The control module is connected to the organic volatile 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 organic volatiles in the detection space and the change in the size data of the battery under test during the vacuum operation. The battery leakage detection is realized by combining the organic volatile detection and the size detection. On the one hand, the battery size is measured by using the sliding resistance principle, and the size measurement does not leave the vacuum environment, which avoids the influence of the air pressure change on the size of the battery under test, and improves the reliability of the detection result. On the other hand, the comprehensive analysis method combining the two detection methods can prevent the influence of accidental factors on the detection results, and further improves the reliability of the detection results.

[0060] Embodiment 2

[0061] Optionally, Figure 2A schematic diagram of another battery leakage detection device provided in an embodiment of the present invention, in which the connection relationship between the environment adjustment module and other modules, units and components is omitted. Figure 2 The size detection module 103 includes a sliding variable resistance component 201, a position measurement component 202 and a measurement conversion unit 203. The sliding variable resistance component 201 includes a sliding part; the position measurement component 202 is arranged on the battery placement position close to the battery to be inspected, and is also connected to the sliding part of the sliding variable resistance component 201; the position measurement component 202 is used to drive the sliding part to move correspondingly within the range of measurement as the volume of the battery to be inspected increases or decreases. The measurement conversion unit 203 is connected to the sliding variable resistance component 201 and the control module 104 respectively, and the measurement conversion unit 203 is used to convert the access resistance of the sliding variable resistance component 201 into the size data of the battery to be inspected and report it to the control module 104.

[0062] Specifically, the battery placement position refers to a preset position in the detection space for fixing the battery to be tested. Exemplarily, the battery placement position can be a preset position provided by a fixture table that can carry and fix the battery to be tested. The position measuring component 202 refers to a measuring component that is arranged on the battery placement position and can produce a state change corresponding to the volume change of the battery to be tested, wherein the state change of the position measuring component 202 may include a shape change and / or position change of its components. The position measuring component 202 is close to the surface of the battery to be tested on the battery placement position, and is also connected to the sliding member of the sliding variable resistance component 201. In the process of the size change of the battery to be tested, the shape and / or position of the position measuring device will change accordingly, thereby driving the sliding member connected to it to move within the measuring range. Exemplarily, the measuring component 202 may include a clamping type measuring device, a guiding type measuring device, or any other measuring device that can drive the sliding member to move accordingly according to the volume change of the device being measured. For example, the clamping type measuring device can use two relative clips driven by an elastic member to clamp the battery under test. During the change of the size of the battery under test, the distance between the two clips will change accordingly with the size of the battery under test, thereby driving the sliding member in the sliding variable resistance component 201 to move within its measuring range; for another example, the contact device in the guiding type measuring device is in close contact with the battery under test, and the guiding device can limit the sliding direction for the contact device. During the change of the battery size, the contact device will also move accordingly along the sliding direction as the battery surface expands or contracts, thereby driving the sliding member in the sliding variable resistance component 201 to move within its measuring range.

[0063] The sliding variable resistance component 201 refers to a component that changes the resistance value of the access circuit by changing the position of its sliding member based on the sliding variable resistance principle. Exemplarily, the sliding variable resistance component 201 may include a sliding member and a fixed connecting member. The sliding member is connected to the measuring position component 202; the sliding member and the fixed connecting member of the sliding variable resistance component 201 are respectively connected to the measurement conversion unit 203 through the line. The sliding member can move accordingly with the change of the state of the measuring position component 202, change its contact position with the long resistor surface, and thus change the resistance value of the circuit between the access sliding member and another fixed connecting member. The measurement conversion unit 203 refers to a data conversion circuit or component that can convert the access resistance data of the sliding variable resistance component 201 into the size data of the battery to be tested. The measurement conversion unit 203 is respectively connected to the sliding member and the fixed connecting member of the sliding variable resistance component 201, and can obtain the access resistance of the sliding variable resistance component 201 and convert it into the size data of the battery to be tested. Exemplarily, the measurement conversion unit 203 may include a resistance sampling circuit and a data conversion chip. The resistance sampling circuit is respectively connected to the sliding member and the fixed connecting member of the sliding variable resistance assembly 201, and can collect the access resistance between the sliding member and the fixed connecting member. The data conversion chip can be respectively connected to the resistance sampling circuit and the control module 104, and can use a preset program to convert the access resistance into the size data of the battery under test and report it to the control module 104, wherein the access resistance and the size data of the battery under test can be in a linear relationship.

[0064] In the battery leakage detection device provided in this embodiment, the size detection module includes a sliding variable resistance component, a position measuring component and a measurement conversion unit. The sliding variable resistance component includes a sliding part. The position measuring component is arranged on the battery placement position close to the battery to be inspected, and is also connected to the sliding part of the sliding variable resistance component; the position measuring component is used to drive the sliding part to move accordingly within the measuring range as the volume of the battery to be inspected increases or decreases. The measurement conversion unit is connected to the sliding variable resistance component and the control module respectively, and the measurement conversion unit is used to convert the access resistance of the sliding variable resistance component into the size data of the battery to be inspected. The combination of the sliding variable resistance component, the position measuring component and the measurement conversion unit realizes the reliable measurement of the size of the battery to be inspected, and further improves the reliability of the detection result.

[0065] Embodiment 3

[0066] Optionally, Figure 3 A schematic diagram of another battery leakage detection device provided in an embodiment of the present invention, in which the connection relationship between the environment adjustment module and other modules, units and components is omitted. Based on any of the above embodiments, Figure 3, the size detection module 103 includes a sliding variable resistance component 201, a position measurement component 202 and a measurement conversion unit 203. The sliding variable resistance component 201 includes a sliding member 301; the position measurement component 202 includes a guide member 302 and a contact member 303. The guide member 302 is slidably connected to the contact member 303, and the guide member 302 is used to provide a guide direction for the contact member 303; the contact member 303 is closely attached to the surface of the battery under inspection, and is also connected to the sliding member 301, and the contact member 303 is used to drive the sliding member 301 to move a corresponding distance along the guide direction according to the volume change of the battery under inspection. The measurement conversion unit 203 is connected to the sliding variable resistance component 201 and the control module 104 respectively, and the measurement conversion unit 203 is used to convert the access resistance of the sliding variable resistance component 201 into the size data of the battery under inspection and report it to the control module 104.

[0067] Specifically, the battery placement position refers to a preset position in the detection space for fixing the battery under test. For example, the battery placement position can be a preset position provided by the fixture table that can carry and fix the battery under test. The position measuring component 202 refers to a measuring component that is arranged on the battery placement position and can produce a state change corresponding to the volume change of the battery under test. The position measuring component 202 includes a contact 303 and a guide 302. The contact 303 is a device that directly contacts the battery under test on the battery placement position in the position measuring component 202. For example, the contact 303 can be a cover plate arranged on the battery placement position, and the cover plate is connected to the sliding member 301 of the sliding variable resistance component 201. During the detection process, the cover plate can be covered 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, so as to drive the sliding member 301 of the sliding variable resistance member to move correspondingly within the range. The guide 302 is a device that provides a guiding direction for the movement of the contact 303. The contact member 303 is connected to the guide member 302. The contact member 303 can be moved along the guide direction provided by the guide member 302 under the drive of the battery under inspection. Exemplarily, the guide member 302 may include at least one of a track, a guide tube and a guide column. Taking the guide member 302 as a track as an example, the edge of the contact member 303 may be provided with a protrusion that is embedded in the shape of the track. The protrusion can be set in the track so that the contact member 303 can only move along the guide direction.

[0068] The sliding variable resistance component 201 refers to a component that changes the resistance value of the access line through the position change of its sliding member 301 based on the sliding variable resistance principle. Exemplarily, the sliding variable resistance component 201 may include a sliding member 301 and a fixed connecting member. The sliding member 301 is connected to the measuring position component 202; the sliding member 301 and the fixed connecting member of the sliding variable resistance component 201 are respectively connected to the measurement conversion unit 203 through the line. The sliding member 301 can move accordingly with the state change of the measuring position component 202, change its contact position with the long resistor surface, and thus change the resistance value of the line between the access sliding member 301 and another fixed connecting member. The measurement conversion unit 203 refers to a data conversion circuit or component that can convert the access resistance data of the sliding variable resistance component 201 into the size data of the battery to be tested. The measurement conversion unit 203 is respectively connected to the sliding member 301 and the fixed connecting member of the sliding variable resistance component 201, and can obtain the access resistance of the sliding variable resistance component 201 and convert it into the size data of the battery to be tested. Exemplarily, the measurement conversion unit 203 may include a resistance sampling circuit and a data conversion chip. The resistance sampling circuit is respectively connected to the sliding member 301 and the fixed connection member of the sliding variable resistance component 201, and can collect the access resistance between the sliding member 301 and the fixed connection member. The data conversion chip can be respectively connected to the resistance sampling circuit and the control module 104, and a preset program can be used to convert the access resistance into the size data of the battery under test and report it to the control module 104, wherein the access resistance and the size data of the battery under test can be linearly related.

[0069] In the battery leakage device provided in this embodiment, the size detection module includes a sliding variable resistance component, a position measurement component and a measurement conversion unit. The sliding variable resistance component and the position measurement component are both arranged in the detection space. The sliding variable resistance component includes a sliding member; the position measurement component includes a guide member and a contact member, the guide member is slidably connected to the contact member, and the guide member is used to provide a guide direction for the contact member; the contact member is in close contact with the surface of the battery to be inspected, and is also connected to the sliding member, and the contact member is used to drive the sliding member to move a corresponding distance along the guide direction according to the volume change of the battery to be inspected. The measurement conversion unit is connected to the sliding variable resistance component and the control module respectively, and the measurement conversion unit is used to convert the access resistance of the sliding variable resistance component into the size data of the battery to be inspected and report it to the control module, and the guide member and the contact member are used to realize the stable conversion of the data from the size change of the battery to be inspected to the access resistance of the sliding variable resistance component, thereby further improving the reliability of the detection result.

[0070] Embodiment 4

[0071] Optionally, Figure 4 A schematic diagram of a sliding variable resistance component, a position measuring component and a battery placement position provided by a corresponding fixture platform provided in an embodiment of the present invention, based on any of the above embodiments, combined with Figure 3 and Figure 4The guide member 302 in the position measuring assembly 202 may include at least one guide column 401 arranged in the same direction, and the guide column 401 is uprightly arranged beside the battery placement position 402; the contact member 303 includes a cover plate 403, and the cover plate 403 is provided with guide holes corresponding to the guide columns 401; the guide holes are sleeved on the corresponding guide columns 401, and are used to limit the cover plate 403 to move only along the extension direction of the central axis of the guide column 401. The sliding variable resistance assembly 201 may include a sliding member 301 and a resistance column 404. The sliding member 301 includes a carbon brush 405 and a conductor connector 406. The resistance column 404 is arranged on one side of the battery placement position 402, and the extension direction of the central axis of the resistance column 404 is the same as the guide direction; the carbon brush 405 is slidably connected to the resistance column 404, so that the carbon brush 405 can only slide along the extension direction of the resistance column 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 member 303 disposed on the battery placement position 402. During the detection process, it can be placed on the battery under test and driven 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 hard plate slightly larger than the battery placement position 402, so that the cover plate 403 is in full contact with the surface of the battery under test. The guide column 401 is a columnar guide component disposed beside the battery placement position 402, which can cooperate with the corresponding guide hole on the cover plate 403 to guide the movement of the cover plate 403. The number of guide holes on the guide column 401 and the cover plate 403 is the same and one-to-one corresponding, and the shape of the guide hole on the cover plate 403 matches the cross-sectional shape of the corresponding guide column 401, so that the guide hole can be sleeved on the corresponding guide column 401, limiting the cover plate 403 to move only along the extension direction of the central axis of the guide column 401. Exemplarily, in the case where the four guide columns 401 are all cylindrical and are respectively arranged upright on the outside of the four corners of the rectangular battery placement position 402, the rectangular cover plate 403 can be respectively provided with circular guide holes corresponding to each guide column 401 at the four corners, and each guide column 401 passes through its corresponding guide hole, thereby limiting the cover plate 403 to move only along the extension direction of the central axis of the guide column 401. The guide column 401 can also include a guide section 407 and a limiting section 408, the guide hole is sleeved on the guide section 407 and the cross section of the guide hole matches the cross section of the wire section 407, and can slide up and down on the guide section 407. The cross-sectional area of ​​the limiting section 408 is larger than that of the guiding section 407 and the guiding hole, and the positional relationship between the limiting section 407 and the guiding section 408 can be interchanged to limit the movable height of the cover plate 403 .

[0073] The sliding member 301 is a connecting member disposed between the measuring position assembly 202 and the resistor column 404, and includes a carbon brush 405 and a conductor connecting member 406. The carbon brush 405 contacts the resistor column 404 and can slide on the surface of the resistor column 404 along the extension direction of the axis of the resistor column 404. For example, the carbon brush 405 can be an arc-shaped graphite carbon brush 405 adapted to the side curvature of the resistor column 404. The arc-shaped arrangement can make the carbon brush 405 fit more closely to the side of the resistor column 404, thereby improving the stability of connection and sliding. The conductor connecting member 406 is a member for connecting the carbon brush 405 and the measuring position assembly 202, and at least the position where it is connected to the carbon brush 405 is a conductor. The conductor position of the conductor connector 406 can be used as the moving contact of the sliding variable resistance component 201, connected to the measurement conversion unit 203, and correspondingly, one end of the resistance column 404 is used as the static contact of the sliding variable resistance component 201, connected to the measurement conversion unit 203, so that the measurement conversion unit 203 can sample the access resistance of the sliding variable resistance component 201. Exemplarily, the conductor connector 406 can be a metal elastic member or a metal connecting column, wherein the metal elastic member can provide pressure for the carbon brush 405 to press against the resistance column 404, so that the carbon brush 405 is more fully in contact with the side of the resistance column 404, thereby improving the structural stability of the size measurement module.

[0074] The measurement conversion unit 203 can obtain the access resistance of the sliding variable resistance 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 access resistance of the sliding variable resistance component 201 and the size data of the battery under test. Therefore, the access resistance of the sliding variable resistance component 201 and its corresponding size data of the battery under test can be calibrated in advance to obtain the relationship between the access resistance and the size data of the battery under test. Therefore, in the actual detection process, the measurement conversion unit 203 can convert the access resistance into the size data of the battery under test according to the relationship. During the calibration process, the access resistance value and battery size data of the carbon brush 405 at different positions on the resistor column 404 can be obtained. For example, when the cover plate 403 is at position A, the size data of the battery is Da, and the access resistance value of the sliding variable resistance component 201 is Ra; when the cover plate 403 is at position B, the size data of the battery is Db, and the access resistance value of the sliding variable resistance component 201 is Rb; based on the two groups of data, the linear relationship between the access resistance of the sliding variable resistance component 201 and the size data of the battery under test can be determined. Suppose the real-time size data is Y, and the real-time access resistance is r. According to the data of group A, the formula Da=k1*Ra+m can be obtained, and according to the data of group B, the formula Db=k2*Rb+m can be obtained, wherein k1=(Da-Db) / (Ra-Rb), k2=(RaDb-RbDa) / (Ra-Rb); based on this, the linear relationship between the access resistance of the sliding variable resistance 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 conversion unit 203 can determine the size data of the battery under test according to the measured access resistance, thereby eliminating the influence of the air pressure change on the size detection result of the battery under test and improving the accuracy of the detection precision.

[0075] Embodiment 5

[0076] Optionally, Figure 5 A schematic diagram of the structure of another battery leakage detection device provided by an embodiment of the present invention, Figure 6 A schematic diagram of another battery leakage detection device provided by an embodiment of the present invention is shown in FIG. Figure 5 The display of the control module is omitted. Based on any of the above embodiments, Figure 4 , Figure 5 and Figure 6 The environmental adjustment operation may also include an inflation operation, which refers to the filling of filling gas into the detection environment before vacuuming to ensure that the initial organic volatile concentration in the detection environment is the same for each detection, thereby preventing the residual gas from the previous detection from affecting the current detection.

[0077] Specifically, the environment adjustment module may include a vacuum chamber 501, a fixture table 502, an air pressure sensor 503, a vacuum pumping device 504, an air charging device 505 and a gas storage tank 506. The fixture table 502 and the air pressure sensor 503 are both arranged in the vacuum chamber 501, and the fixture table 502 is used to provide a battery placement position 402 and fix the inspected battery on the battery placement position 402. The air pressure sensor 503 is connected to the vacuum pumping device 504, and the air pressure sensor 503 is used to detect the air pressure data in the vacuum chamber 501 and provide an air pressure feedback signal for the vacuum pumping device 504. The gas storage tank 506 is used to store the purified filling gas. The vacuum chamber 501 is respectively provided with a vacuum pumping port 507, an air charging port 508 and a sampling port 509, and their corresponding first control valve 513, second control valve 514 and third control valve 515. The setting positions of the filling 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 filling port 508 can be set at the bottom of the vacuum chamber 501, and the sampling port 509 is set at the top of the vacuum chamber 501; if the density of the filling gas is less than the density of air, the filling port 508 is set at the top of the vacuum chamber 501, and the sampling port 509 is set at the bottom of the vacuum chamber 501, so as to ensure that during the inflation process, the filling gas can squeeze the gas in the vacuum chamber 501 out of the vacuum chamber 501 as quickly as possible, thereby increasing the speed at which the filling gas fills the vacuum chamber 501.

[0078] The gas filling device 505 is connected to the gas storage tank 506 and the gas filling port 508 respectively. The gas filling device 505 is used to fill the filling gas in the gas storage tank 506 into the interior of the vacuum chamber 501 before the vacuum operation, until the organic volatile concentration of the gas overflowing from the sampling port 509 is within the allowable range, thereby purifying and unifying the gas environment in the vacuum chamber 501, and preventing the gas released by the previously inspected battery from affecting the current test results. The organic volatile detection module 102 includes an organic volatile detector 510, a first organic volatile detection probe 511 and a second organic volatile detection probe 512 connected to the organic volatile detector 510, the first organic volatile detection probe 511 is arranged at the vacuum port 507, and the second organic volatile detection probe 512 is arranged at the sampling port 509. The organic volatile detector 510 is connected to the vacuum pumping device 504 by gas circuit, so that the gas in the vacuum chamber 501 is captured and detected by the organic volatile detector 510 after being extracted from the vacuum pumping port 507, so as to detect the concentration of organic volatiles in the detection space during the vacuum pumping operation. The organic volatile detector 510 is also connected to the sampling port 509 by gas circuit, and the filling gas in the vacuum chamber 501 overflows from the sampling port 509 after being filled, and the filling gas overflowing from the sampling port 509 is captured and detected by the organic volatile detector 510, which can provide a sampling feedback signal for the gas filling device 505. If a procedure for inflating the vacuum chamber 501 is set before the vacuum pumping, the organic volatile concentration of the overflowing gas collected by the sampling port 509 when the gas filling device 505 stops inflating can be used as the initial organic volatile concentration in the detection space during the vacuum pumping operation, and participate in the determination of the leakage detection result of the battery under test.

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

[0080] After the battery to be inspected is placed in the vacuum chamber 501 and fixed, the initial size data of the battery to be inspected can be detected as D1 by the size detection device. The vacuum chamber 501 is closed to form a closed space inside the vacuum chamber 501. The vacuum port 507 is closed, and the gas charging port 508 and the sampling port 509 are opened. The filling gas in the gas tank 506 is filled into the vacuum chamber 501 through the gas charging device 505, and the filling gas is overflowed from the sampling port 509, wherein the filling gas in the gas tank 506 can include any one of hydrogen, helium, nitrogen and purified ordinary air collected in the designated space. The purpose of closing the vacuum port 507 is to prevent the filling gas from overflowing from the vacuum port 507. The organic volatiles detector 510 is used to detect the change in the organic volatiles concentration of the gas overflowing from the sampling port 509. If the change in the organic volatiles concentration of the gas overflowing from the sampling port 509 per unit time is less than the change threshold (or the organic volatiles concentration of the gas overflowing from the sampling port 509 is equal to the organic volatiles concentration of the gas 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 organic volatiles concentration collected by the current sampling port 509 can be recorded as the initial organic volatiles concentration N1 and the inflation device 505 can be controlled to stop inflation.

[0081] After the initial organic volatile concentration N1 is measured, the gas filling port 508 and the sampling port 509 are closed, and the vacuum port 507 is opened. The internal space of the vacuum chamber 501 is vacuumed through the vacuum port 507 by the vacuum device 504, and the organic volatile concentration in the detection space and the size data of the battery under test are monitored during the vacuum operation. For example, during the vacuuming process, if the battery under test expands, the cover plate 403 in the position measuring component 202 will move up along the guide direction provided by the guide member. At this time, the cover plate 403 will drive the sliding member of the sliding variable resistance component 201 to move up, and the carbon brush 405 in the sliding member moves relative to the resistor column 404, thereby changing the resistance value in the detection circuit formed by the sliding member and one end of the resistor column 404. Therefore, the measurement conversion unit 203 can detect the size change of the battery under test according to the change of the access resistance value. A corresponding database about the access resistance value and the size value of the battery under test can be established through pre-testing and calculation. When the access resistance value is measured, the size value of the battery under test can be obtained by looking up the table.

[0082] When the air pressure value in the vacuum chamber 501 drops to the preset air pressure threshold, the vacuum pumping can be stopped and the vacuum port 507 can be closed to form a completely enclosed space in the vacuum chamber 501. After the vacuum pumping is stopped, the vacuum chamber 501 can be kept completely closed for a preset time before collecting the final size data D2 of the battery under test and the final organic volatile concentration N2 of the gas discharged from the vacuum port 507. The setting of the air pressure threshold can prevent the air pressure in the vacuum chamber 501 from being too low and causing damage to the battery under test. Keeping the battery under test in a vacuum state for a preset time can keep the size change of the battery under test stable and make the concentration of organic volatiles in the vacuum chamber 501 tend to be stable after vacuum pumping.

[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, and the obtained difference is the change amount DO of the size data of the battery under test during the vacuum operation. The control module 104 can also calculate the difference between the final organic volatile concentration N2 and the initial organic volatile concentration N1 according to the second formula N0=N2-N1, and the obtained difference is the change amount N0 of the organic volatile concentration of the battery under test during the vacuum operation. Furthermore, the control module 104 can compare the change amount N0 of the organic volatile concentration and the change amount D0 of the size data with their corresponding set thresholds. When the change amount N0 of the organic volatile concentration and the change amount D0 of the size data are both less than their corresponding set thresholds, it can be determined that the battery under test has no leakage failure. If the change in the concentration of organic volatiles N0 is less than the corresponding set threshold, and the change in the size data D0 reaches or exceeds the corresponding set threshold, it indicates that the amount of leakage in the battery under test is within the normal range, but the battery under test still deforms. In this case, it can be judged that there is too much gas inside the battery under test, which is an excessive gas storage fault. When the external air pressure drops, the pressure difference between the inside and outside of the battery under test increases, and the battery with excessive gas storage will be supported by the gas inside and expand. If the change in the concentration of organic volatiles N0 and the change in the size data D0 both reach or exceed their corresponding set thresholds, it indicates that the battery under test has leaked. Some organic gas does not have time to be discharged from the battery under test, resulting in an increase in the pressure difference between the inside and outside of the battery under test, which in turn causes the battery under test to swell, causing the change in the concentration of organic volatiles N0 to reach or exceed the set threshold. At this time, it can be known that the leakage of the outer layer of the battery under test is small, and the leakage of the inner layer is large. If the change in the concentration of organic volatiles N0 reaches or exceeds the corresponding set threshold, and the change in the size data D0 is less than the corresponding set threshold, it indicates that the leakage of the battery under test is large.

[0084] The environmental adjustment operation implemented by the environmental adjustment module in the battery leakage detection device provided in the embodiment of the present invention also includes an inflation operation, which is an operation of filling gas into the detection environment before vacuuming. This can ensure the consistency of the initial organic volatile concentration in the detection environment for each detection, prevent the residual gas from the previous detection from affecting the current detection, and improve the accuracy of the battery leakage detection results.

[0085] Embodiment 6

[0086] An embodiment of the present invention further provides a battery leakage detection method, which can be applied to any of the above-mentioned battery leakage detection devices. Figure 7 A flow chart of a battery leakage detection method provided by an embodiment of the present invention, based on any of the above embodiments, referring to Figure 7 , battery leakage detection methods include:

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

[0088] Specifically, the environmental adjustment operation refers to the operation of monitoring and adjusting the environmental parameters in the detection space, wherein the detection environmental parameters may include air pressure, temperature, humidity and environmental concentration of organic volatiles, and illustratively, the environmental adjustment operation may include a vacuuming operation. During the detection process, the environmental adjustment module can use a vacuuming device to vacuum the detection space and adjust the air pressure of the environment in which the battery under test is located by vacuuming.

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

[0090] Specifically, during the environmental adjustment operation, the organic volatile detection module is used to detect the organic volatile concentration of the gas in the detection space where the battery under test is located. The detection frequency of the organic volatile concentration can be real-time detection, or it can be detected at preset time intervals or at each preset time node, and there is no limitation here. During the process of the environmental adjustment module vacuuming the detection space and other environmental adjustment operations before and after (such as the inflation operation before vacuuming or the sealing and static operation after vacuuming), the organic volatile detection module can be used to detect the organic volatile concentration in the detection space. Exemplarily, the organic volatile detection module can include an organic volatile detector. During the process of the environmental adjustment module vacuuming the detection space, the organic volatile detector can be used to sample the organic volatile concentration of the gas extracted by the vacuum device in real time.

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

[0092] Specifically, during the environmental adjustment operation, the size detection module is used to measure the size of the battery under test in the detection space based on the sliding variable resistance principle. The size detection frequency of the battery under test can be real-time detection, or it can be detected at a preset time interval or at each preset time node, and no restrictions are made here. In the process of vacuuming the detection space and other environmental adjustment operations before and after, the size detection module can be used to convert the size change of the battery under test into the change of the resistance in the access circuit of the sliding variable resistor, and then through the measurement of the resistance of the access circuit of the sliding variable resistor, the real-time sampling of the size data of the battery under test is realized. Exemplarily, the size detection module may include a sliding variable resistor, a position measuring component and a converter, and the position measuring component is arranged in the detection space, connected to the outer surface of the battery under test and driven as the size of the battery under test changes. The position measuring component is also connected to the slider of the sliding variable resistor. As the size of the battery under test changes, the position measuring component can also drive the slider to slide on the resistor body, so that the resistance at both ends of the access converter changes 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 the preset program, so as to realize the real-time measurement of the size of the battery under test. The size measurement method using the sliding variable resistance principle makes it unnecessary to leave the detection space for the size measurement of the battery under test, thus avoiding the measurement error caused by the rebound of the size of the battery under test after leaving the detection space, and can improve the reliability of the detection.

[0093] S704, determining a leakage detection result of the battery under test by combining the change in the concentration of volatile organic compounds in the test space and the change in the size data of the battery under test during the vacuuming operation.

[0094] Specifically, during the environmental adjustment operation, the control module may receive the organic volatile concentration output by the organic volatile detection module and the size data output by the size detection module, and preprocess the data. Exemplarily, the preprocessing may include the removal, correction and conversion of abnormal values, and may also include the selection of target data. Then, the control module may determine the change in the organic volatile concentration in the detection space and the change in the size data of the detected battery during the vacuuming operation according to the preprocessed organic volatile concentration and size data. Then, the control module determines the leakage detection result of the detected battery in combination with the change in the organic volatile concentration in the detection space and the change in the size data of the detected battery during the vacuuming process. Exemplarily, the control module may determine the leakage detection result of the detected battery according to the relative relationship between the change in the organic volatile concentration and the change in the size data and their corresponding set thresholds. For example, when the change in the organic volatile concentration and the change in the size data do not exceed the corresponding set threshold, it is determined that the detected 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 organic volatiles in the detection space is measured. During the environmental adjustment operation, the dimension data of the battery under test is measured using the sliding resistance principle. The leakage detection result of the battery under test is determined by combining the change in the concentration of organic volatiles in the detection space and the change in the dimension data of the battery under test during the vacuum operation. The battery leakage detection is achieved by combining organic volatile detection and dimension detection. On the one hand, the battery size is measured using the sliding resistance principle, and the dimension measurement does not deviate from the vacuum environment, thereby avoiding the influence of air pressure changes on the size of the battery under test and 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 and further improve the reliability of the detection results.

[0096] Embodiment 7

[0097] Figure 8 A flow chart of another battery leakage detection method provided by an embodiment of the present invention, based on any of the above embodiments, referring 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, the concentration of volatile organic compounds in the detection space is measured.

[0100] S803. During the environmental adjustment operation, the sliding resistance principle is used to measure the size data of the battery under inspection.

[0101] Steps S801 , S802 , and S803 respectively correspond to steps S701 , S702 , and S703 in the aforementioned embodiment and have the same contents, and are not described again here.

[0102] S804: Determine the change in the concentration of the volatile organic matter in the detection space during the vacuuming operation according to the initial concentration of the volatile organic matter and the final concentration of the volatile organic matter in the detection space.

[0103] Specifically, the initial organic volatile concentration refers to the organic volatile concentration in the detection space before the vacuuming operation, which can be detected by using the organic volatile detection module. For example, on the one hand, when the environmental adjustment operation includes the vacuuming operation but does not include the gas filling operation, the initial organic volatile concentration can be the organic volatile concentration in the detection space before the vacuuming operation starts. On the other hand, when the environmental adjustment operation includes both the vacuuming operation and the gas filling operation, the gas filling operation is set before the vacuuming operation to introduce purified filling gas into the detection space. The organic volatile concentration of the filling gas is extremely low, which can eliminate the influence of the gas generated in the previous detection on this detection. In this case, the initial organic volatile concentration can be the organic volatile concentration in the detection space collected between the end of the gas filling operation and the start of the vacuuming operation. The final organic volatile concentration refers to the organic volatile concentration in the detection space after vacuuming, which can be detected by using an organic volatile detection module. For example, the final organic volatile concentration can be the organic volatile concentration detected by using the organic volatile detection module at the end of the vacuuming operation, or it can be the organic volatile concentration detected by using the organic volatile detection module after the air pressure in the detection space is maintained for a preset time after the vacuuming operation. According to the difference between the final organic volatile concentration and the initial organic volatile concentration in the detection space, the change in the organic volatile concentration in the detection space during the vacuuming operation can be determined.

[0104] S805 , determining the change amount of the size data of the battery under inspection during the vacuuming operation according to the initial size data and the final size data of the battery under inspection.

[0105] Specifically, the initial size data refers to the original size data of the battery under test before vacuuming, which can be detected by the size detection module. Exemplarily, the initial size data can be the size data of the battery under test measured by the size detection module after the battery under test is placed in the detection space and before the vacuuming operation begins, which can be any one of the height, width, length and volume of the battery under test. The final size data refers to the size data of the battery under test in the detection space under low pressure after the vacuuming operation. Exemplarily, 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 air pressure in the detection space is maintained for a preset time after the vacuuming operation. According to the difference between the final size data and the initial size data of the battery under test, the change in the size data of the battery under test during the vacuuming operation can be determined.

[0106] S806 , comparing the change in the concentration of the volatile organic matter and the change in the size data with their corresponding set thresholds.

[0107] Specifically, the set threshold value corresponding to the change in the concentration of organic volatiles refers to the upper limit of the normal concentration range corresponding to the concentration of organic volatiles in the battery under test during the vacuum pumping operation. The normal concentration range corresponding to the concentration of organic volatiles in 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 failures in vacuum pumping tests, wherein the air pressure reached in the vacuum pumping test is the same as the air pressure level required for the vacuum pumping operation in this application. Once the change in the concentration of organic volatiles exceeds the set threshold value, it means that the organic volatiles leaked from the battery under test during the vacuum pumping operation exceed the normal range, and the concentration of organic volatiles can indicate the degree of leakage.

[0108] The set threshold value corresponding to the change in the dimensional data refers to the upper limit of the normal dimensional range corresponding to the dimensional data of the battery under test during the vacuum pumping 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 of multiple normal batteries and batteries with different degrees of leakage failures in vacuum pumping tests, wherein the air pressure reached in the vacuum pumping test is the same as the air pressure level required for the vacuum pumping operation in this application. Once the change in the dimensional data of the battery under test exceeds the set threshold value, it means that the deformation of the battery under test during the vacuum pumping 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: When the change in the concentration of the volatile organic matter and the change in the size data do not exceed their corresponding set thresholds, determine that the inspected battery has no leakage.

[0110] S808: When the change in the concentration of the volatile organic matter does not exceed the corresponding set threshold but the change in the size data exceeds the corresponding set threshold, it is determined that the inspected battery has excessive gas storage.

[0111] S809: When the change in the concentration of the volatile organic matter exceeds the corresponding set threshold, it is determined that the battery under inspection is leaking.

[0112] Specifically, if the change in the concentration of the volatile organic matter and the change in the size data are both smaller than their corresponding set thresholds, it means that the inspected battery has not leaked.

[0113] If the change in the concentration of volatile organic matter is less than the corresponding set threshold, and the change in the dimensional data is greater than or equal to the corresponding set threshold, it indicates that the amount of organic gas leakage in the inspected battery is within the set range, but the inspected battery is still deformed. In this case, it can be determined that there is too much gas inside the inspected battery (excessive gas storage). During the vacuum operation, the air pressure outside the battery drops. The pressure difference between the inside and outside of the battery with excessive gas storage will increase, and the inspected battery will be supported by the internal air pressure and expand. This gas storage fault does not belong to a leakage fault, but it will also increase the risk of the inspected battery. It can be identified and indicated to facilitate the inspection personnel to take corresponding measures.

[0114] There are two situations in which the battery under test has leakage: On the one hand, if the change in the concentration of organic volatiles and the change in the size data are both greater than or equal to their corresponding set thresholds, it indicates that the battery under test has leakage, and part of the leaked organic gas has no time to be discharged from the battery under test, which increases the pressure difference between the inside and outside of the battery under test, and then causes the battery under test to swell, causing the change in the concentration of organic volatiles to exceed the set range. At this time, it can be seen that the leakage of the outer layer of the battery under test is small, and the leakage of the inner layer of the battery under test is large. On the other hand, if the change in the concentration of organic volatiles is greater than or equal to its corresponding set threshold, and the change in the size data is less than its corresponding set threshold, it indicates that the leakage of the battery under test is large.

[0115] The battery leakage detection method provided by the embodiment of the present invention determines the change in the concentration of organic volatiles in the detection space during the vacuum operation based on the initial concentration of organic volatiles and the final concentration of organic volatiles in the detection space. The change in the dimensional data of the battery under inspection during the vacuum operation is determined based on the initial dimensional data and the final dimensional data of the battery under inspection. The change in the concentration of organic volatiles and the change in the dimensional data are compared with their corresponding set thresholds, respectively. When the change in the concentration of organic volatiles and the change in the dimensional data do not exceed their corresponding set thresholds, it is determined that the battery under inspection has not leaked. When the change in the concentration of organic volatiles exceeds its corresponding set threshold, it is determined that the battery under inspection has leaked. When 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, it is determined that the battery under test has excessive gas storage. On the one hand, by comparing the difference between the initial size and the final size to judge the size change of the battery under test during the vacuum operation, the size difference between different types of batteries can be eliminated, thereby broadening the application scope of the detection device. On the other hand, through the analysis of the concentration of volatile organic compounds and the size data, the identification of batteries with excessive gas storage is realized, the detection items for faulty batteries are expanded, and the safety of batteries leaving the factory is improved.

[0116] Embodiment 8

[0117] Fig. 9 A flow chart of a leakage severity detection method provided in an embodiment of the present invention, which can be set after determining the leakage detection result of the battery under test in any of the above embodiments, is used to review the detection result and determine the severity. Figure 8 and Fig. 9 , leakage severity detection methods include:

[0118] S901. When the leakage detection result shows that the battery under test is leaking, re-evacuate the space and measure the concentration of volatile organic matter in the detection space and the size data of the battery under test.

[0119] Specifically, when the leakage detection result shows that the battery under test is leaking, if it is necessary to obtain the severity of the leakage of the battery under test or to re-test the detection result (also called inspection), the vacuum can be re-drawn and the concentration of organic volatiles in the detection space and the size data of the battery under test can be measured. By way of example, steps S701, S702, S703 and S704 in the aforementioned embodiment are repeated to re-perform the environmental adjustment operation and re-obtain the change in the concentration of organic volatiles in the detection space and the change in the size data of the battery under test during a vacuum operation.

[0120] S902, calculating the leakage index of the inspected battery according to the initial organic volatile concentration, the final organic volatile concentration, the initial size data and the final size data during the two vacuuming operations.

[0121] Specifically, the leakage index of the battery under test refers to data reflecting the degree of leakage of the battery under test. The higher the leakage index of the battery under test, the higher the degree of leakage of the battery under test. If the initial size data obtained in the previous test is D11, the initial organic volatile concentration obtained in the previous test is N11, the final organic volatile concentration obtained in the previous test is N21, the final size data in the previous test is D21, the change in the organic volatile concentration obtained in the previous test is N0, and the change in the size data obtained in the previous test is D0; the initial size data obtained in the next test is D12, the initial organic volatile concentration obtained in the next test is N12, the final organic volatile concentration obtained in the next test is N22, and the final size data obtained in the next test is D22, the set threshold value corresponding to the change in the organic volatile concentration is n0, and the set threshold value corresponding to the change in the size data is d0. Based on the initial organic volatile concentration N11 obtained from the previous detection, the initial organic volatile concentration N12 obtained from the next detection, the final organic volatile concentration N21 obtained from the previous detection, the final organic volatile concentration N22 obtained from the next detection, and the set threshold value n0 corresponding to the change in the organic volatile concentration, the concentration correction index n is calculated according to the third formula n=(N11+N12+N21+N22) / 4n0. Based on the initial size data D11 obtained from the previous detection, the initial size data D12 obtained from the next detection, the final size data D21 obtained from the previous detection, the final size data D22 obtained from the next detection, and the set threshold value d0 corresponding to the change in the size data, the size correction index d is calculated according to the fourth formula d=(D11+D12+D21+D22) / 4d0. Based on the change in the concentration of organic volatiles obtained in the previous detection, N0, and the set threshold value n0 corresponding to the change in the concentration of organic volatiles, the concentration determination index n1 is calculated according to the fourth formula n1=(N0-n0) / n0. Based on the change in the size data obtained in the previous detection, D0, and the set threshold value d0 corresponding to the change in the size data, the size determination index d1 is calculated according to the fifth formula d1=(D0-d0) / d0. Finally, based on the concentration determination index n1, the change in the concentration of organic volatiles obtained in the previous detection, N0, the concentration correction index n, the set threshold value n0 corresponding to the change in the concentration of organic volatiles, the size determination index d1, the change in the size data obtained in the previous detection, D0, the size correction index d, and the set threshold value d0 corresponding to the change in the size data, 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 review result of the leakage detection according to the relative relationship between the leakage index and the corresponding set threshold value.

[0123] Specifically, the set threshold corresponding to the leakage index is the upper limit of the reasonable range of the leakage index of the normal battery. Exemplarily, the set threshold corresponding to the leakage index can be determined based on multiple groups of experimental data of multiple normal batteries and batteries with different degrees of leakage failure in vacuum tests, so that the leakage index of the normal tested battery is less than the set threshold corresponding to the leakage index. According to 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, when the leakage index exceeds its corresponding set threshold, it can be determined that the secondary leakage detection result is leakage, otherwise it is no leakage. Then, the secondary leakage detection result is compared with the previous leakage detection result. When the two leakage detection results are the same, the review result can be determined to be consistent. When the two leakage detection results are different, the review result can be determined to be inconsistent.

[0124] S904. When the review result is consistent, the leakage severity of the inspected battery is indicated according to the leakage index.

[0125] Specifically, the leakage index can reflect the severity of leakage of the battery under test. If the verification result is consistent, the severity of leakage of the battery under test can be indicated based on the leakage index. For example, the severity of leakage of the battery under test can be indicated by directly showing the leakage index, or by judging the severity of leakage according to the leakage index and showing the severity of leakage judgment result, wherein the severity of leakage judgment result can include slight leakage, moderate leakage and severe leakage. The indication of the severity of leakage can facilitate the detection personnel to make corresponding disposal and improve the efficiency of detection and treatment.

[0126] The battery leakage detection device and detection method provided by the present invention, the environment adjustment module is used to perform a vacuum operation on the detection space. The organic volatile detection module is used to measure the concentration of organic volatiles in the detection space during the vacuum operation. The size detection module is used to measure the size data of the battery under test by using the sliding resistance principle during the vacuum operation of the detection space. The control module is connected to the organic volatile detection module and the size detection module respectively, and the control module is used to determine the leakage detection result of the battery under test by combining the change in the concentration of organic volatiles in the detection space during the vacuum operation and the change in the size data of the battery under test. The battery leakage detection is realized by combining the organic volatile detection and the size detection. On the one hand, the battery size is measured by using the sliding resistance principle, and the size measurement does not leave the vacuum environment, thereby avoiding the influence of air pressure changes on the size of the battery under test, and improving the reliability of the detection result. On the other hand, the comprehensive analysis method combining the two detection methods can prevent the influence of accidental factors on the detection results, and further improve the reliability of the detection results.

[0127] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0128] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery leakage detection device, characterized in that: include: Environmental adjustment module, volatile organic matter detection module, size detection module and control module; The environment adjustment module is used to perform an environment adjustment operation on the detection space, wherein the environment adjustment operation includes a vacuuming operation; The organic volatile matter detection module is used to measure the concentration of organic volatile matter in the detection space during the environment adjustment operation; The size detection module is used to measure the size data of the battery under inspection by using the sliding resistance principle during the environmental adjustment operation; The control module is connected to the volatile organic matter detection module and the size detection module respectively, and is used to determine the leakage detection result of the battery under inspection by combining the change in the concentration of the volatile organic matter in the detection space and the change in the size data of the battery under inspection during the vacuum operation.

2. The battery leakage detection device according to claim 1, characterized in that: The size detection module includes a sliding resistance component, a position measurement component and a measurement conversion unit; The sliding variable resistance component and the level measuring component are both arranged in the detection space; the sliding variable resistance component includes a sliding part; the level measuring component is arranged on the battery placement position close to the battery to be inspected, and is also connected to the sliding part of the sliding variable resistance component; the level measuring component is used to drive the sliding part to move correspondingly within the range of the measuring range as the volume of the battery to be inspected increases or decreases; The measurement conversion unit is connected to the sliding variable resistance component and the control module respectively, and is used to convert the access resistance of the sliding variable resistance component into the size data of the battery under inspection and report it to the control module.

3. The battery leakage detection device according to claim 1, characterized in that: The size detection module includes a sliding resistance component, a position measurement component and a measurement conversion unit; The sliding variable resistance assembly and the position measuring assembly are both arranged in the detection space; the sliding variable resistance assembly includes a sliding member; the position measuring assembly includes a guide member and a contact member, the guide member is slidably connected to the contact member, and the guide member is used to provide a guiding direction for the contact member; the contact member is closely attached to the surface of the battery under inspection and is also connected to the sliding member, and the contact member is used to drive the sliding member to move a corresponding distance along the guiding direction according to the volume change of the battery under inspection; The measurement conversion unit is connected to the sliding variable resistance component and the control module respectively, and is used to convert the access resistance of the sliding variable resistance component into the size data of the battery under inspection and report it to the control module.

4. The battery leakage detection device according to claim 3, characterized in that: The guide member includes at least one guide column arranged in the same direction, and the guide column is uprightly arranged next to the battery placement position; the contact member includes a cover plate, and the cover plate is provided with guide holes corresponding to the guide columns one by one; the guide holes are sleeved on the corresponding guide columns, and are used to limit the cover plate to move only along the extension direction of the central axis of the guide column.

5. The battery leakage detection device according to claim 3, characterized in that: The sliding variable resistance assembly also includes a resistance column; the sliding part includes a carbon brush and a conductor connecting part; The resistor column is arranged on one side of the battery placement position, and the extension direction of the central axis of the resistor column is the same as the guide direction; the carbon brush is slidably connected to the resistor column so that the carbon brush can only slide along the extension direction of the resistor column; one end of the conductor connector is fixedly connected to the carbon brush, and the other end is fixedly connected to the contact member.

6. The battery leakage detection device according to claim 5, characterized in that: The conductor connector includes an elastic member, and the elastic member is used to provide pressure for the carbon brush to press against the resistor column, so that the carbon brush is in full contact with the side surface of the resistor column.

7. A battery leakage detection method, characterized in that: The battery leakage detection method is implemented by the battery leakage detection device according to any one of claims 1 to 6, and the battery leakage detection method comprises: Performing an environmental adjustment operation on the detection space, wherein the environmental adjustment operation includes a vacuuming operation; During the environmental adjustment operation, measuring the concentration of volatile organic compounds in the detection space; During the environmental adjustment operation, the dimension data of the battery under inspection is measured by using the sliding resistance principle; The leakage detection result of the battery under inspection is determined by combining the change in the concentration of the volatile organic matter in the detection space and the change in the size data of the battery under inspection during the vacuuming operation.

8. The battery leakage detection method according to claim 7, characterized in that: Determining a leakage detection result of the battery under test by combining the change in the concentration of the volatile organic matter in the detection space and the change in the size data of the battery under test during the vacuuming operation includes: Determining a change in the concentration of the volatile organic matter in the detection space during the vacuuming operation according to the initial concentration of the volatile organic matter and the final concentration of the volatile organic matter in the detection space; Determining a change in the size data of the battery under inspection during the vacuuming operation according to the initial size data and the final size data of the battery under inspection; Comparing the change in the concentration of the volatile organic matter and the change in the size data with their corresponding set thresholds respectively; When the change in the concentration of the volatile organic matter and the change in the size data do not exceed their corresponding set thresholds, determining that the inspected battery has no leakage; When the change in the concentration of the volatile organic matter exceeds a corresponding set threshold, it is determined that the battery under inspection has leaked.

9. The battery leakage detection method according to claim 8, characterized in that: After comparing the change in the concentration of the volatile organic matter and the change in the size data with their corresponding set thresholds, the method further includes: When the change in the concentration of the volatile organic matter does not exceed the corresponding set threshold but the change in the size data exceeds the corresponding set threshold, it is determined that the inspected battery has excessive gas storage.

10. The battery leakage detection method according to any one of claims 7 to 9, characterized in that: After determining the leakage detection result of the battery under test, the method further includes: When the leakage detection result shows that the inspected battery is leaking, re-performing the vacuuming operation and measuring the concentration of the volatile organic matter in the detection space and the size data of the inspected battery; Calculating the leakage index of the inspected battery according to the initial organic volatile concentration, the final organic volatile concentration, the initial size data and the final size data during the two vacuuming operations; Determining the review result of the leakage detection according to the relative relationship between the leakage index and the corresponding set threshold value; When the review result is consistent, the leakage severity of the inspected battery is indicated according to the leakage index.

Images