In-situ detection system for battery and battery

Abstract

The utility model provides an in-situ detection system for a battery and the battery, and belongs to the technical field of batteries. The in-situ detection system comprises: a mass spectrometry detection assembly configured to communicate with a first gas path connection hole and a second gas path connection hole in a shell of a battery; the infrared spectrum detection assembly is constructed to penetrate through a first infrared connecting hole and a second infrared connecting hole in a shell of the battery; the mass spectrometric detection system is connected with the mass spectrometric detection assembly and is configured to provide carrier gas for the interior of the shell of the battery and perform mass spectrometric analysis on a gas-phase product in the shell of the battery, and the carrier gas is used for bearing the gas-phase product; and the infrared spectrum detection system is connected with the infrared spectrum detection assembly and is configured to perform infrared spectrum analysis on the battery. The in-situ detection system can be used for carrying out in-situ detection on a solid-phase product, a liquid-phase product and a gas-phase product of the battery at the same time, and the integration level and the adaptability of the in-situ detection system are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an in-situ detection system for a battery and a battery. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] When testing a battery, it is often necessary to analyze the solid-phase products, liquid-phase products, and gas-phase products of the battery to provide more dimensional battery information. In order to more accurately reflect the actual situation of the battery, in-situ testing is usually used, that is, the solid-phase products, liquid-phase products, and gas-phase products produced by the battery are tested at the actual use location or on-site, so that the relevant data and status of the battery can be obtained in real time. However, the current in-situ battery testing process often requires separate testing of the solid-phase products, liquid-phase products, and gas-phase products produced by the battery, and there is a lack of testing methods that can detect these products simultaneously. Utility Model Content

[0004] This application aims to at least address the technical problem in the prior art of being unable to simultaneously analyze solid, liquid, and gaseous products during in-situ battery testing. To this end, one objective of this application is to provide an in-situ battery testing system that enables simultaneous in-situ testing of solid, liquid, and gaseous products.

[0005] An embodiment of the first aspect of the present application provides an in-situ detection system for a battery, comprising: a mass spectrometry detection component, configured to communicate with a first gas path connection hole and a second gas path connection hole on a battery shell; an infrared spectrometry detection component, configured to pass through a first infrared connection hole and a second infrared connection hole on the battery shell; a mass spectrometry detection system, connected to the mass spectrometry detection component, configured to provide a carrier gas to the interior of the battery shell and perform mass spectrometry analysis on gaseous products inside the battery shell, wherein the carrier gas is used to carry the gaseous products; and an infrared spectrometry detection system, connected to the infrared spectrometry detection component, configured to perform infrared spectrometry analysis on the battery.

[0006] In the technical solution of the embodiments of the present application, the mass spectrometry detection component and the mass spectrometry detection system can be used to analyze gas-phase products, and the infrared spectrometry detection component and the infrared spectrometry detection system can be used to analyze solid-phase products and liquid-phase products, thereby simultaneously performing in-situ detection on the solid-phase products, liquid-phase products and gas-phase products of the battery, thereby improving the integration of the in-situ detection system and expanding its usage scenarios.

[0007] In some embodiments, the mass spectrometry detection assembly includes: a first conduit configured to communicate with the first gas circuit connection hole to transmit carrier gas to the interior of the battery housing; and a second conduit configured to communicate with the second gas circuit connection hole to transmit the gaseous product to the mass spectrometry detection system. The conduits transmit the carrier gas and gaseous product, thereby enabling mass spectrometry analysis of the gaseous product by the mass spectrometry detection system, thereby improving the accuracy of the detection results.

[0008] In some embodiments, the inner diameter of the first conduit is equal to the inner diameter of the second conduit, and the outer diameter of the first conduit is equal to the outer diameter of the second conduit. Setting the inner and outer diameters of the two conduits to the same value helps improve consistency and sealing during gas-phase product detection, resulting in more accurate analysis results.

[0009] In some embodiments, the infrared spectroscopy detection assembly includes an optical fiber, a first end of the optical fiber passing through a first infrared port, and a second end of the optical fiber passing through a second infrared port. The use of the optical fiber in the infrared spectroscopy assembly allows for transmitting an infrared spectrum into the interior of the battery and transmitting the spectrum from within the battery to a detection instrument, enabling accurate analysis of the battery's solid-phase and liquid-phase products.

[0010] In some embodiments, the mass spectrometry detection system includes: a gas source gas circuit connected to the mass spectrometry detection assembly and configured to transmit carrier gas to the interior of the battery housing through the mass spectrometry detection assembly; and a mass spectrometry analysis gas circuit connected to the mass spectrometry detection assembly and configured to perform mass spectrometry analysis on the gaseous products transmitted through the mass spectrometry detection assembly. Providing both the gas source gas circuit to provide carrier gas and the mass spectrometry analysis gas circuit in the mass spectrometry detection system enables mass spectrometry analysis of the gaseous products, improving the accuracy of detection results.

[0011] In some embodiments, the gas source circuit includes: a gas source configured to provide a carrier gas; a first filter connected to the gas source and configured to filter the carrier gas; and a flow meter connected to the first filter and configured to detect the flow rate of the carrier gas. The gas source circuit can provide relatively pure carrier gas, reduce the introduction of interfering substances, and can also monitor the flow rate of the carrier gas, thereby rationally setting the amount of carrier gas entering the battery.

[0012] In some embodiments, the mass spectrometry gas circuit includes: a cooling hydrazine configured to intercept volatile impurities in the gaseous product; a second filter connected to the cooling hydrazine and configured to filter the gaseous product from the cooling hydrazine; and a mass spectrometer connected to the second filter and configured to perform mass spectrometry analysis on the filtered gaseous product. Passing the gaseous product through the cooling hydrazine and then the filter can filter out volatile impurities and small particulate impurities in the gaseous product, reduce interfering substances in the gaseous product, and improve the accuracy of the detection results.

[0013] In some embodiments, the mass spectrometry instrument includes a mass spectrometer or a gas chromatograph. Using a mass spectrometer or a gas chromatograph for mass spectrometry analysis can perform qualitative or quantitative analysis on gas phase products according to detection requirements.

[0014] In some embodiments, the infrared spectrum detection system includes: an infrared spectrometer connected to the infrared spectrum detection assembly and configured to provide an infrared spectrum to the infrared spectrum detection assembly; and a photoconductive detector connected to the infrared spectrum detection assembly and configured to perform infrared spectrum analysis on the infrared spectrum from the infrared spectrum detection assembly. Using the infrared spectrometer to provide an infrared spectrum within the battery while simultaneously using the photoconductive detector to perform infrared spectrum analysis can achieve accurate analysis of the battery's solid-phase and liquid-phase products.

[0015] The second embodiment of the present application provides a battery, comprising: a housing, the housing having a first air connection hole, a second air connection hole, a first infrared connection hole, and a second infrared connection hole; a positive electrode post located at one end of the housing along the battery's axis; and a negative electrode post located at the other end of the housing along the battery's axis opposite the positive electrode post. The battery housing has air connection holes and infrared connection holes, enabling the use of the in-situ detection system of the above embodiment to detect the battery simultaneously, meeting the requirement for in-situ detection of the battery's solid-phase products, liquid-phase products, and gas-phase products.

[0016] In some embodiments, the first gas connection hole and the second gas connection hole are symmetrical about the axis of the battery. Placing the two gas connection holes at symmetrical positions ensures that the position where the carrier gas enters the battery housing and the position where the gaseous product exits the battery housing are symmetrical. This allows for accurate collection of the gaseous product at the desired location, resulting in more accurate detection results.

[0017] In some embodiments, the first infrared port and the second infrared port are symmetrical about the battery axis. Placing the two infrared ports in symmetrical positions and reducing the distance between them can improve the accuracy of detection results while reducing the space inside the battery occupied by the infrared spectrum detection assembly.

[0018] In some embodiments, along the battery's axis, the distance between the first gas connection hole and the positive electrode post is shorter than the distance between the first infrared connection hole and the positive electrode post. Placing the gas connection hole closer to the positive electrode post allows the mass spectrometry detection assembly to be closer to the positive electrode post, facilitating the collection of gaseous products in the battery. This also allows the infrared spectrometry detection assembly to be closer to the negative electrode post, facilitating infrared spectroscopic analysis of solid and liquid products in the battery.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0021] Figure 1 A schematic diagram of an in-situ detection system for a battery according to some embodiments of the present application;

[0022] Figure 2 Schematic diagram of the structure of the battery, mass spectrometry detection component, and infrared spectrum detection component in some embodiments of the present application;

[0023] Figure 3 This is a schematic diagram of an in-situ detection system for batteries according to some embodiments of the present application.

[0024] Description of reference numerals:

[0025] Battery 10, positive electrode 11, negative electrode 12, shell 13;

[0026] First gas connection hole 131, second gas connection hole 132, first infrared connection hole 133, second infrared connection hole 134;

[0027] Mass spectrometry detection component 110, infrared spectrum detection component 120;

[0028] A first conduit 111 and a second conduit 112;

[0029] Mass spectrometry detection system 20, infrared spectrum detection system 30;

[0030] Control valve 23, gas source gas line 210, mass spectrometry gas line 220, infrared spectrometer 31, photoconductive detector 32;

[0031] Gas source 211 , first filter 212 , flow meter 213 , cooling hydrazine 221 , second filter 222 , mass spectrometer 223 . DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0034] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0035] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0037] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0040] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0041] When testing batteries, it is often necessary to analyze the battery's solid-phase products, liquid-phase products, and gas-phase products to provide more diverse battery information. To more accurately reflect the battery's true condition, in-situ testing is often used. This involves testing the solid-phase products, liquid-phase products, and gas-phase products produced at the battery's actual location or on-site, thereby obtaining relevant battery data and status in real time.

[0042] In existing technologies, batteries typically require separate infrared spectroscopy testing to analyze their solid and liquid phases, or separate mass spectrometry testing to analyze their gas phases. This testing process is time-consuming, and battery performance can change over time, leading to inaccurate test results.

[0043] In order to achieve simultaneous detection of the solid-phase products, liquid-phase products and gas-phase products of the battery, an in-situ detection system that integrates mass spectrometry detection function and infrared spectrum detection function can be used, so that the gas-phase products of the battery can be analyzed at the same time as the solid-phase products and liquid-phase products of the battery.

[0044] The in-situ detection system disclosed in the embodiments of this application can be used, but is not limited to, in batteries used in electrical devices such as vehicles, ships, or aircraft. By using the in-situ detection system disclosed in this application, the solid, liquid, and gas phase products of the battery can be simultaneously detected in situ, thereby improving the integration of the in-situ detection system and expanding its application scenarios.

[0045] The present application embodiment provides an in-situ detection system for a battery. Figure 1The in-situ detection system includes a mass spectrometry detection component 110 , an infrared spectrum detection component 120 , a mass spectrometry detection system 20 and an infrared spectrum detection system 30 .

[0046] The mass spectrometry detection assembly 110 is configured to communicate with a first gas connection hole 131 and a second gas connection hole 132 on the housing 13 of the battery 10 .

[0047] The infrared spectrum detection component 120 is configured to pass through the first infrared receiving hole 133 and the second infrared receiving hole 134 on the housing 13 of the battery 10 .

[0048] The mass spectrometry detection system 20 is connected to the mass spectrometry detection assembly 110 and is configured to provide carrier gas to the interior of the housing 13 of the battery 10 and perform mass spectrometry analysis on the gaseous products inside the housing 13 of the battery 10. The carrier gas is used to carry the gaseous products.

[0049] The infrared spectrum detection system 30 is connected to the infrared spectrum detection component 120 and is configured to perform infrared spectrum analysis on the battery 10 .

[0050] As used herein, the term "battery" may include different types of batteries such as pouch cells, Swagelok batteries, and the like.

[0051] To better obtain various information about the battery during use, it is necessary to perform in-situ detection of various products in the battery while it is operating. These in-situ detections mainly include detection of solid-phase products at the electrode interface, detection of liquid-phase products in the electrolyte, and detection of gas-phase products generated during battery operation.

[0052] Take Swagelok batteries as an example. Figure 1 As shown, the housing 13 of the battery 10 has four holes, namely a first gas connection hole 131, a second gas connection hole 132, a first infrared connection hole 133, and a second infrared connection hole 134. The locations and dimensions of the four holes can be designed based on testing requirements to better match the mass spectrometry detection assembly 110 and the infrared spectrum detection assembly 120.

[0053] The mass spectrometer detection assembly 110 is connected to the gas circuit port, thereby extracting the gaseous products generated within the battery 10 for mass spectrometry analysis. The infrared spectrum detection assembly 120 passes through the infrared port, thereby inputting the infrared spectrum into the battery 10 and outputting the infrared spectrum from the battery 10 for infrared spectrum analysis.

[0054] When the battery 10 is subjected to in-situ testing, the battery 10 is connected to an electrochemical workstation. The electrochemical workstation can control the electrochemical parameters of the battery 10 during operation, such as the battery's current and voltage. When the battery 10 is in the required operating state, the mass spectrometry detection system 20 inputs a carrier gas into the housing 13 of the battery 10 and performs mass spectrometry analysis on the gaseous products generated inside the housing 13. The role of the carrier gas is to carry the gaseous products at a certain flow rate to transfer them to the mass spectrometry instrument. The carrier gas may include gases such as hydrogen, helium, nitrogen, argon, and carbon dioxide. At the same time, an infrared spectroscopy detection system 30 is used to perform infrared spectroscopy analysis on the solid-phase products and liquid-phase products inside the battery 10.

[0055] The mass spectrometry detection component and mass spectrometry detection system can be used to analyze gas-phase products, and the infrared spectrum detection component and infrared spectrum detection system can be used to analyze solid-phase products and liquid-phase products, thereby simultaneously performing in-situ detection of the battery's solid-phase products, liquid-phase products, and gas-phase products, thereby improving the integration of the in-situ detection system and expanding its usage scenarios.

[0056] According to some embodiments of the present application, reference Figure 2 The mass spectrometry detection component 110 includes a first conduit 111 and a second conduit 112 .

[0057] The first conduit 111 is configured to communicate with the first gas connection hole 131 to transmit the carrier gas to the interior of the housing 13 of the battery 10 .

[0058] The second conduit 112 is configured to communicate with the second gas connection hole 132 to transmit the gas-phase product to the mass spectrometry detection system 20 .

[0059] Continuing with the Swagelok battery example, Figure 2 As shown, the carrier gas can be input into the housing 13 of the battery 10 through the first gas connection hole 131 via the first conduit 111 , and output through the second gas connection hole 132 via the second conduit 112 .

[0060] In some embodiments, polyetheretherketone (PEEK) airtight tubes can be used for both the first conduit 111 and the second conduit 112. The outer diameter of the conduit can be set to be equal to the diameter of the airway connection hole. After the conduit is implanted in the airway connection hole, the connection between the conduit and the airway connection hole can be sealed using adhesive (e.g., epoxy resin) or welding, and cured for a period of time (e.g., 12 hours) to improve the sealing of the connection.

[0061] The carrier gas and the gas phase product are transmitted using a conduit, so that the mass spectrometry detection system can perform mass spectrometry analysis on the gas phase product, thereby improving the accuracy of the detection results.

[0062] According to some embodiments of the present application, the inner diameter of the first conduit 111 is equal to the inner diameter of the second conduit 112 , and the outer diameter of the first conduit 111 is equal to the outer diameter of the second conduit 112 .

[0063] The outer diameter of the catheter can be determined based on the diameter of the gas path connection hole that can be opened on the shell 13 of the battery 10, so that after the gas path connection hole is opened on the shell 13, the risk of abnormal operation of the battery is low, and after the catheter is implanted in the gas path connection hole, the impact on the normal operation of the battery can be minimized as much as possible.

[0064] The inner diameter of the conduit can be determined based on parameters such as the flow rate of the carrier gas and the speed at which the battery generates gaseous products, so that the content of the gaseous products transmitted to the detection instrument is within an appropriate range and the detection instrument can accurately detect them.

[0065] In some embodiments, the catheter has an inner diameter greater than 0.001 inches and less than 0.01 inches, and an outer diameter greater than 0.05 inches and less than 0.1 inches. In one example, the catheter has an inner diameter of 0.005 inches and an outer diameter of 0.0625 inches.

[0066] Setting the inner and outer diameters of the two conduits to the same value improves consistency and sealing during gas-phase product detection, resulting in more accurate analysis results. By properly setting the outer and inner diameters of the conduits, the transmission of carrier gas and gas-phase products is aligned with the detection instrument. This also reduces the volume occupied by the mass spectrometer detection component and increases the time resolution of the mass spectrometer analysis, improving detection accuracy.

[0067] According to some embodiments of the present application, the infrared spectrum detection component 120 includes an optical fiber.

[0068] The first end of the optical fiber passes through the first infrared receiving hole 133 , and the second end of the optical fiber passes through the second infrared receiving hole 134 .

[0069] Continuing with the Swagelok battery example, Figure 1 As shown in the figure, the optical fiber passes through two infrared ports. One end of the optical fiber can be connected to the infrared spectrometer, and the other end can be connected to the light guide detector.

[0070] In some embodiments, the connection between the optical fiber and the infrared port can be sealed by adhesive (eg, epoxy resin) or welding, and cured for a period of time (eg, 12 hours) to improve the sealing of the connection.

[0071] The use of optical fiber in the infrared spectroscopy component can transmit the infrared spectrum into the battery and transmit the spectrum inside the battery to the detection instrument, thereby achieving accurate analysis of the solid phase products and liquid phase products of the battery.

[0072] According to some embodiments of the present application, reference Figure 3 The mass spectrometry detection system 20 includes a gas source gas circuit 210 and a mass spectrometry analysis gas circuit 220 .

[0073] The gas source gas line 210 is connected to the mass spectrometer detection component 110 and is configured to transmit the carrier gas to the interior of the housing 13 of the battery 10 through the mass spectrometer detection component 110 .

[0074] The mass spectrometry gas circuit 220 is connected to the mass spectrometry detection component 110 and is configured to perform mass spectrometry analysis on the gas phase products transmitted through the mass spectrometry detection component 110 .

[0075] exist Figure 3 In the example shown, the gas source gas circuit 210 and the mass spectrometry gas circuit 220 are connected to the mass spectrometry detection assembly 110 via a control valve 23. The control valve 23 can be a valve in the form of a four-way valve. In some embodiments, the control valve 23 can also be omitted, and the gas source gas circuit 210 and the mass spectrometry gas circuit 220 are directly connected to the mass spectrometry detection assembly 110. The gas source gas circuit 210 can be connected to the first conduit 111 in the mass spectrometry detection assembly 110, and the carrier gas is transmitted to the interior of the housing 13 of the battery 10 via the first conduit 111. The mass spectrometry gas circuit 220 can be connected to the second conduit 112, and the gaseous product is transmitted to the detection instrument via the second conduit 112 for mass spectrometry analysis.

[0076] Setting up a gas source gas circuit to provide carrier gas in the mass spectrometry detection system and setting up a mass spectrometry analysis gas circuit at the same time can realize mass spectrometry analysis of gas phase products and improve the accuracy of detection results.

[0077] According to some embodiments of the present application, reference Figure 3 The gas source gas circuit 210 includes a gas source 211 , a first filter 212 and a flow meter 213 .

[0078] The gas source 211 is configured to provide a carrier gas.

[0079] The first filter 212 is connected to the gas source 211 and is configured to filter the carrier gas.

[0080] The flow meter 213 is connected to the first filter 212 and is configured to detect the flow rate of the carrier gas.

[0081] like Figure 3 As shown, the carrier gas provided by the gas source 211 is filtered at the first filter 212 to remove small particles of impurities in the carrier gas. After filtering, the carrier gas passes through the flow meter 213. The flow meter 213 can monitor the flow rate of the carrier gas and compare it with the preset carrier gas flow rate to determine whether the carrier gas is being delivered normally.

[0082] In one example, the flow rate of the carrier gas may be set to less than 0.5 milliliters per minute (ml / min).

[0083] The gas source gas line can provide relatively pure carrier gas, reduce the introduction of interfering substances, and can also monitor the flow rate of the carrier gas, so as to reasonably set the amount of carrier gas entering the battery.

[0084] According to some embodiments of the present application, reference Figure 3 The mass spectrometry gas circuit 220 includes a cooling hydrazine 221 , a second filter 222 and a mass spectrometry instrument 223 .

[0085] The cooling hydrazine 221 is configured to intercept volatile impurities in the gas phase product.

[0086] The second filter 222 is connected to the cooling hydrazine 221 and is configured to filter the gas-phase product from the cooling hydrazine 221 .

[0087] The mass spectrometer 223 is connected to the second filter 222 and is configured to perform mass spectrometry analysis on the filtered gas phase product.

[0088] like Figure 3 As shown, after the gaseous products generated by battery 10 are output, they first enter cooling hydrazine 221 to intercept volatile impurities therein, thereby protecting mass spectrometer 223 and improving the accuracy of the detection results. In one example, the temperature of cooling hydrazine 221 can be set to -30 degrees Celsius (°C).

[0089] The gaseous product then enters the second filter 222. The second filter 222 can filter small particulate impurities in the gaseous product, such as lithium salt and other impurity particles. In one example, the second filter 222 can use a 2.0 micron (μm) porous steel filter.

[0090] The gas phase product after filtration is subjected to mass spectrometry analysis at a mass spectrometer 223 to obtain analysis results.

[0091] The gas phase product is passed through the cooling hydrazine and the filter in sequence, so as to filter out the volatile impurities and small particle impurities in the gas phase product, reduce the interfering substances in the gas phase product, and improve the accuracy of the detection result.

[0092] According to some embodiments of the present application, the mass spectrometry instrument 223 includes: a mass spectrometer or a gas chromatograph.

[0093] A mass spectrometer can perform qualitative analysis of gaseous products. A gas chromatograph can perform quantitative analysis of gaseous products. During the testing process, you can choose the appropriate method based on your desired results.

[0094] Mass spectrometry analysis using a mass spectrometer or gas chromatograph can be used to perform qualitative or quantitative analysis on gas phase products according to detection requirements.

[0095] According to some embodiments of the present application, reference Figure 3 The infrared spectrum detection system 30 includes an infrared spectrometer 31 and a photoconductive detector 32 .

[0096] The infrared spectrometer 31 is connected to the infrared spectrum detection component 120 and is configured to provide an infrared spectrum to the infrared spectrum detection component 120 .

[0097] The photoconductive detector 32 is connected to the infrared spectrum detection assembly 120 and is configured to perform infrared spectrum analysis on the infrared spectrum from the infrared spectrum detection assembly 120 .

[0098] like Figure 3 As shown, one end of the optical fiber is connected to the infrared spectrometer 31, and the infrared spectrum is transmitted to the inside of the shell 13 of the battery 10 via the optical fiber; the other end is connected to the photoconductive detector 32, and the infrared spectrum inside the battery 10 is transmitted to the photoconductive detector 32 for infrared spectrum analysis to obtain relevant analysis results about the solid phase products and liquid phase products inside the battery 10.

[0099] Using an infrared spectrometer to provide infrared spectra inside the battery and using a photoconductive detector for infrared spectrum analysis can achieve accurate analysis of the solid phase products and liquid phase products of the battery.

[0100] The present application embodiment provides a battery. Figure 2 The battery 10 includes a shell 13, a positive electrode post 11 and a negative electrode post 12.

[0101] The housing 13 defines a first air connection hole 131 , a second air connection hole 132 , a first infrared connection hole 133 , and a second infrared connection hole 134 .

[0102] The positive electrode post 11 is located at one end of the housing 13 in the direction along the axis X of the battery 10 .

[0103] The negative electrode post 12 is located at the other end of the housing 13 opposite to the positive electrode post 11 along the axis X of the battery 10 .

[0104] In this document, the battery axis refers to the battery's symmetry axis. In some embodiments, the two electrodes of the battery are located on two opposite end surfaces of the battery, and the battery axis refers to the battery's symmetry axis along the line connecting the two electrodes. Figure 2 The example shown is a Swagelok battery. Figure 2As shown, the positive electrode post 11 and the negative electrode post 12 are located at opposite ends of the battery 10 along the X axis. The mass spectrometer detection assembly 110 is connected to the gas circuit port, thereby extracting gaseous products generated within the battery 10 for mass spectrometry analysis. The infrared spectrum detection assembly 120 extends through the infrared port, thereby inputting infrared spectra into the battery 10 and outputting infrared spectra from the battery 10 for infrared spectrum analysis.

[0105] Gas connection holes and infrared connection holes are opened on the battery shell, so that the in-situ detection system in the above embodiment can be used to detect the battery, meeting the need for in-situ detection of the solid phase product, liquid phase product and gas phase product of the battery at the same time.

[0106] According to some embodiments of the present application, the first gas connection hole 131 and the second gas connection hole 132 are axisymmetric with respect to the axis X of the battery 10 .

[0107] like Figure 2 As shown, two gas path connection holes are respectively opened at positions symmetrical to the axis X of the housing 13 and are respectively connected to the mass spectrometry detection assembly 110.

[0108] The two gas path connection holes are set at symmetrical positions, so that the position where the carrier gas enters the battery shell and the position where the gas phase product exits the battery shell are symmetrical to each other, and the gas phase product at the position to be detected can be accurately collected, making the detection result more accurate.

[0109] According to some embodiments of the present application, the first infrared hole 133 and the second infrared hole 134 are axisymmetric with respect to the axis X of the battery 10 .

[0110] like Figure 2 As shown, two infrared ports are provided at positions symmetrical about axis X on the housing 13. The infrared spectrum detection assembly 120 passes through these two infrared ports. Compared to placing the infrared ports at other locations, the distance between the two symmetrical infrared ports about axis X is shorter, and the space occupied by the optical fiber inside the housing 13 is also smaller.

[0111] The two infrared ports are arranged at positions symmetrical to each other, which can improve the accuracy of the detection result while reducing the space inside the battery occupied by the infrared spectrum detection component.

[0112] According to some embodiments of the present application, along the axis X of the battery 10 , the distance between the first gas connection hole 131 and the positive electrode post 11 is smaller than the distance between the first infrared connection hole 133 and the positive electrode post 11 .

[0113] like Figure 2As shown, during the in-situ battery testing process, the battery 10 is typically placed upright. At this point, the positive electrode post 11 of the battery 10 faces upward. Since the solid-phase and liquid-phase products in the battery 10 are deposited at the bottom of the battery housing 13, while the gas-phase products primarily accumulate at the top of the battery housing 13, the gas connection hole can be positioned above the housing 13, i.e., closer to the positive electrode post 11, and the infrared connection hole can be positioned below the housing 13, i.e., farther away from the positive electrode post 11.

[0114] In other embodiments, the positions of the gas connection holes and the infrared connection holes may be set according to factors such as the placement direction of the battery 10 and the locations where solid-phase products, liquid-phase products, and gas-phase products may accumulate.

[0115] Placing the gas connection port closer to the positive electrode allows the mass spectrometry detection component to be closer to the positive electrode, facilitating the collection of gaseous products in the battery. Simultaneously, the infrared spectrometry detection component can be placed closer to the negative electrode, facilitating infrared spectroscopic analysis of solid and liquid products in the battery.

[0116] A specific embodiment of the present application is described below. It should be understood that this specific embodiment is described for illustrative purposes only and should not be construed as limiting the present application.

[0117] like Figure 1 and Figure 2 As shown, the battery 10 includes a positive electrode 11, a negative electrode 12, and a housing 13. The housing 13 is provided with a first gas connection hole 131 and a second gas connection hole 132, which are symmetrical about the axis X of the battery 10, and a first infrared connection hole 133 and a second infrared connection hole 134, which are symmetrical about the axis X of the battery 10. The in-situ detection system includes a mass spectrometry detection assembly 110, an infrared spectrum detection assembly 120, a mass spectrometry detection system 20, and an infrared spectrum detection system 30. The first conduit 111 and the second conduit 112 of the mass spectrometry detection assembly 110 are connected to the first gas connection hole 131 and the second gas connection hole 132, respectively. The optical fiber of the infrared spectrum detection assembly 120 passes through the first infrared connection hole 133 and the second infrared connection hole 134.

[0118] like Figure 3 As shown, when the battery 10 is tested in situ, the electrochemical workstation connected to the positive electrode post 11 and the negative electrode post 12 of the battery 10 sets the electrochemical parameters of the battery 10 .

[0119] The carrier gas provided by the gas source 211 is filtered through the first filter 212, and its flow rate is measured by the flowmeter 213. The carrier gas then flows through the first conduit 111 into the housing 13. The carrier gas carries the gaseous products within the housing 13 through the second conduit 112, enters the cooling hydrazine 221 to intercept volatile impurities, and passes through the second filter 222 for filtration. Finally, the gas enters the mass spectrometer 223 for mass spectrometry analysis, generating qualitative or quantitative analysis results for the gaseous products.

[0120] The infrared spectrometer 31 transmits the infrared spectrum to the inside of the shell 13 through the optical fiber. At the same time, the infrared spectrum inside the shell 13 is transmitted to the photoconductive detector 32 via the optical fiber for infrared spectrum analysis to obtain relevant analysis results of solid phase products and liquid phase products.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An in-situ detection system for a battery, characterized in that: include: a mass spectrometry detection assembly configured to communicate with a first gas path connection hole and a second gas path connection hole on the battery housing; an infrared spectrum detection component, configured to pass through a first infrared receiving hole and a second infrared receiving hole on a housing of the battery; a mass spectrometry detection system, connected to the mass spectrometry detection assembly, configured to provide a carrier gas into the interior of the battery housing and perform mass spectrometry analysis on the gaseous products inside the battery housing, wherein the carrier gas is used to carry the gaseous products; The infrared spectrum detection system is connected to the infrared spectrum detection component and is configured to perform infrared spectrum analysis on the battery.

2. The in-situ detection system according to claim 1, characterized in that: The mass spectrometry detection component includes: a first conduit, configured to communicate with the first gas path connection hole to transmit the carrier gas to the interior of the battery housing; The second conduit is configured to communicate with the second gas channel connection hole to transmit the gas phase product to the mass spectrometry detection system.

3. The in-situ detection system according to claim 2, characterized in that: The inner diameter of the first conduit is equal to the inner diameter of the second conduit, and the outer diameter of the first conduit is equal to the outer diameter of the second conduit.

4. The in-situ detection system according to any one of claims 1 to 3, characterized in that: The infrared spectrum detection component includes: An optical fiber, wherein a first end of the optical fiber passes through the first infrared connection hole, and a second end of the optical fiber passes through the second infrared connection hole.

5. The in-situ detection system according to any one of claims 1 to 3, characterized in that: The mass spectrometry detection system comprises: a gas source gas circuit, connected to the mass spectrometry detection component and configured to transmit the carrier gas to the interior of the battery housing through the mass spectrometry detection component; The mass spectrometry gas circuit is connected to the mass spectrometry detection component and is configured to perform mass spectrometry analysis on the gas phase product transmitted through the mass spectrometry detection component.

6. The in-situ detection system according to claim 5, characterized in that: The gas source gas circuit includes: a gas source configured to provide the carrier gas; a first filter connected to the gas source and configured to filter the carrier gas; The flow meter is connected to the first filter and is configured to detect the flow rate of the carrier gas.

7. The in-situ detection system according to claim 5, characterized in that: The mass spectrometry gas path comprises: cooling hydrazine configured to intercept volatile impurities in the vapor product; a second filter connected to the cooled hydrazine and configured to filter the gas-phase product from the cooled hydrazine; The mass spectrometer is connected to the second filter and is configured to perform mass spectrometry analysis on the filtered gas phase product.

8. The in-situ detection system according to claim 7, characterized in that: The mass spectrometry instrument includes: a mass spectrometer or a gas chromatograph.

9. The in-situ detection system according to any one of claims 1-3 and 6-8, characterized in that: The infrared spectrum detection system comprises: an infrared spectrometer connected to the infrared spectrum detection component and configured to provide an infrared spectrum to the infrared spectrum detection component; The photoconductive detector is connected to the infrared spectrum detection component and is configured to perform infrared spectrum analysis on the infrared spectrum from the infrared spectrum detection component.

10. A battery, characterized in that: include: A housing is provided with a first air path connection hole, a second air path connection hole, a first infrared connection hole, and a second infrared connection hole; a positive electrode post, located at one end of the shell in the direction along the axis of the battery; The negative electrode post is located at the other end of the shell along the axis of the battery, opposite to the positive electrode post.

11. The battery according to claim 10, characterized in that The first gas path connection hole and the second gas path connection hole are axisymmetric with respect to an axis of the battery.

12. The battery according to claim 10 or 11, characterized in that The first infrared contact hole and the second infrared contact hole are axially symmetrical with respect to an axis of the battery.

13. The battery according to claim 12, characterized in that In the direction along the axis of the battery, the distance between the first gas path connection hole and the positive electrode column is smaller than the distance between the first infrared connection hole and the positive electrode column.

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