Battery gas production detection system, battery detection box and detection method

Abstract

The invention provides a battery gas production detection system, a battery detection box and a detection method, and belongs to the technical field of batteries. The battery gas production detection system comprises a battery test box which comprises a chamber for placing a battery to be detected; the gas supplementing device is connected with the battery test box and is used for providing supplementing gas for the chamber according to the pressure in the chamber; the sampling device is connected with the battery test box and is used for collecting gas in the chamber and analyzing gas produced by the battery, and the gas in the chamber comprises at least one of supplementary gas and to-be-tested gas produced by the to-be-tested battery.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery gas generation detection system and a detection method. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] During the operation of the battery, gaseous by-products are generated due to the reaction of electrolyte materials. The generation of gas inside the battery will cause the attenuation of the battery's electrochemical performance and easily lead to battery failure. At the same time, the reaction of the electrolyte materials inside the battery may also generate flammable gases, increasing the safety hazards during the operation of the battery. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the background art. To this end, embodiments of this application provide a battery gas generation detection system and a detection method to alleviate, mitigate or eliminate the problems in the related art.

[0005] An embodiment of the first aspect of this application provides a battery gas generation detection system, including: a battery test box, the battery test box includes a chamber for placing a battery to be tested; a gas supplement device, the gas supplement device is connected to the battery test box and is used to provide supplementary gas to the chamber according to the pressure in the chamber; and a sampling device, the sampling device is connected to the battery test box and is used to collect the gas in the chamber for battery gas generation analysis, and the gas in the chamber includes at least one of the supplementary gas and the gas to be tested generated by the battery to be tested.

[0006] In the technical solution of the embodiment of this application, a gas supplement device is provided, which can provide supplementary gas to the chamber according to the pressure inside the chamber of the battery test box, so that the battery to be tested is in a normal working pressure state, and greatly reduces the evaporation rate of the electrolyte, thereby achieving the goal of non-destructive and long-term testing and improving the accuracy of the detection results.

[0007] In some embodiments, the gas supplement device includes: a gas source for providing supplementary gas to the chamber; and a first switching device, the first switching device is connected between the battery test box and the gas source and is configured to, when it is open, connect the gas source to the chamber, and when it is closed, disconnect the gas source from the chamber. By opening and closing the first switching device, it is possible to control whether the supplementary gas provided by the gas source can enter the chamber, and it is possible to provide supplementary gas to the chamber according to the pressure inside the chamber.

[0008] In some embodiments, the gas replenishing device further includes: a pressure sensor configured to communicate with the chamber and detect the pressure inside the chamber; and a controller connected to the pressure sensor and the first switching device, and configured to control the opening or closing of the first switching device according to the detected pressure. By using the pressure sensor to detect the pressure inside the chamber and the controller to control the first switching device based on the detection result of the pressure sensor, it is possible to supply supplementary gas to the chamber according to the pressure inside the chamber.

[0009] In some embodiments, the battery test box further includes: a first interface through which the sampling device communicates with the chamber; a second interface through which the gas source communicates with the chamber; and a third interface through which the pressure sensor communicates with the chamber. By providing multiple interfaces on the battery test box and connecting them to the sampling device, the gas source, and the pressure sensor respectively, it is possible to prevent interference between the interfaces and improve the accuracy of the detection results. In addition, only one interface is provided for the sampling device on the battery test box, that is, the sampling device is used to extract the gas inside the chamber for sampling. On the one hand, this can avoid the problems of poor time resolution and quantitative accuracy caused by the large volume of the battery test box using the traditional carrier gas blowing injection method, thereby improving the accuracy and time resolution of the qualitative and quantitative analysis of battery gas production. On the other hand, this enables the detection system of the present disclosure to be applicable to hard-shell battery cells (because the hard-shell battery cell only has one air outlet and no carrier gas port, so it is impossible to use the battery test box with the traditional carrier gas blowing injection method).

[0010] In some embodiments, the detection system further includes: a second switching device through which the sampling device is connected to the first interface; a third switching device through which the first switching device is connected to the second interface; and a fourth switching device through which the pressure sensor is connected to the third interface. By providing switching devices between each interface and the corresponding device, it is possible to control the conduction or disconnection of the path from the interface to the corresponding device according to the detection needs, thereby improving the reliability and safety of the detection system.

[0011] In some embodiments, the battery test box further includes: a box body; a cover plate configured to enclose a chamber with the box body; and a sealing member disposed between the box body and the cover plate. By configuring the battery test box to include a box body, a cover plate, and a sealing member, it is convenient to operate the battery to be tested and improve the sealing performance of the battery test box.

[0012] In some embodiments, the battery under test includes a first electrode and a second electrode, and the battery test box further includes: a first pressing piece and a second pressing piece extending from the side wall of the box body into the chamber. The first pressing piece is used to connect with the first electrode, and the second pressing piece is used to connect with the second electrode. By providing pressing pieces for connecting with the battery electrodes in the battery test box, when the battery under test is placed in the mold, it can be easily connected to the pressing pieces, improving the convenience of operation.

[0013] In some embodiments, the detection system further includes: a battery test device connected to the first pressing piece and the second pressing piece and configured to apply voltage and current to the battery under test. The battery test device applies voltage and current to the battery under test through the pressing pieces, and can apply different voltages and currents to the battery under test according to the detection requirements, so as to detect the gas generation situation of the battery under test under various working conditions.

[0014] In some embodiments, the sampling device includes at least one of the following: a fifth switching device configured to communicate with the chamber when it is open and disconnect from the chamber when it is closed; a cooling device for cooling the collected gas; and a filtering device for filtering the collected gas. By using the sampling device, it is possible to collect the gas in the chamber according to the detection requirements without using a carrier gas for injection, reducing the space occupied by the detection system and improving the accuracy of the detection results at the same time.

[0015] In some embodiments, the refrigeration method of the cooling device includes at least one of the following: electric refrigeration, liquid nitrogen refrigeration, or dry ice refrigeration. By using different refrigeration methods according to the detection requirements and the environment where the detection system is located, the adaptability of the detection system to various detection scenarios is improved.

[0016] An embodiment of the second aspect of the present application provides a battery detection box for the above detection system, including: a box body; and a cover plate, which is used to enclose a chamber for accommodating the battery to be tested with the box body; wherein, the box body is provided with: a first interface through which the sampling device communicates with the chamber; and a second interface through which the gas supplement device communicates with the chamber. The battery test box of the present application is provided with an interface for the gas supplement device, through which the gas supplement device can supply supplementary gas to the chamber according to the pressure inside the chamber of the battery test box, so that the battery to be tested is in a normal working pressure state, and greatly reduces the evaporation rate of the electrolyte, thereby achieving the goal of non-destructive and long-time testing and improving the accuracy of the detection results. In addition, only one interface is provided for the sampling device on the battery test box to be suitable for the sampling device to sample the gas in the chamber by means of the pressure difference between the mass spectrometer and the chamber. On the one hand, it can avoid the problems of poor time resolution and quantitative accuracy caused by the large volume of the battery test box using the traditional carrier gas blowing injection method, so as to improve the accuracy and time resolution of the qualitative and quantitative analysis of battery gas production. On the other hand, the battery test box can be applied not only to soft-pack batteries but also to hard-shell battery cores (because the hard-shell battery core only has one air outlet and no carrier gas port, so the battery test box using the traditional carrier gas blowing injection method cannot be used).

[0017] An embodiment of the third aspect of the present application provides a detection method for the detection system in the above embodiment, including: enabling the sampling device to collect the gas in the chamber of the battery test box, where the gas in the chamber includes at least one of the supplementary gas and the gas to be tested generated by the battery to be tested; determining whether the pressure in the chamber is lower than the pressure threshold; and in response to determining that the pressure in the chamber is lower than the pressure threshold, enabling the gas supplement device to supply supplementary gas to the chamber. Enabling the sampling device to collect the gas in the chamber and enabling the gas supplement device to supply supplementary gas to the chamber according to the pressure inside the chamber of the battery test box, so that the battery to be tested is in a normal working pressure state, and greatly reduces the evaporation rate of the electrolyte, thereby achieving the goal of non-destructive and long-time testing and improving the accuracy of the detection results.

[0018] In some embodiments, the detection method further includes: enabling the mass spectrometer to analyze the collected gas. Using the mass spectrometer to detect the gas to be tested collected by the sampling device to achieve mass spectrometry analysis of battery gas production.

[0019] In some embodiments, the detection method further includes: before the sampling device collects the gas in the chamber of the battery test cartridge, causing the gas supply device to supply supplementary gas to the chamber of the battery test cartridge; and in response to the gas signal in the mass spectrometer being in a steady state, causing the battery test device to apply voltage and current to the battery under test. Before detecting the battery under test, by supplying supplementary gas to the chamber, the original gas in the chamber is emptied. When the gas signal in the mass spectrometer is in a steady state, it indicates that the original gas in the chamber has been exhausted, and at this time, the detection of the battery under test can be started, reducing the interference of the original gas in the chamber on the detection result and improving the accuracy of the detection result.

[0020] In some embodiments, the detection method further includes: based on the result of analyzing the collected gas, using the correspondence between the ratio of the gas to be detected and the supplementary gas and the analysis result of the mass spectrometer, determining the quantity of the gas to be detected in the collected gas, wherein the correspondence is obtained by analyzing multiple sets of sample gases collected by the sampling device by the mass spectrometer, and the multiple sets of sample gases have corresponding preset ratios of the gas to be detected and the supplementary gas. By analyzing multiple sets of sample gases to obtain the correspondence between the ratio of the gas to be detected and the supplementary gas and the analysis result of the mass spectrometer, when obtaining the detection result of the battery under test, the quantity of the gas to be detected can be obtained based on this correspondence, improving the convenience of the detection process.

[0021] In some embodiments, causing the gas supply device to supply supplementary gas to the chamber in response to determining that the pressure in the chamber is lower than the pressure threshold includes: in response to determining that the pressure in the chamber is lower than the pressure threshold, causing the first switching device of the gas supply device to open, so that the supplementary gas from the gas source enters the chamber; and in response to determining that the pressure in the chamber is not lower than the pressure threshold, causing the first switching device to close, so that the supplementary gas from the gas source stops entering the chamber. Controlling the opening or closing of the first switching device according to the pressure inside the chamber can achieve supplying supplementary gas to the chamber only when the pressure in the chamber is low.

[0022] An embodiment of the fourth aspect of the present application provides a detection device for the above detection system, characterized in that it includes: a collection module configured to cause a sampling device to collect the gas in the chamber of the battery test cartridge for the mass spectrometer to analyze the collected gas, and the gas in the chamber includes at least one of supplementary gas and the gas to be detected generated by the battery under test; a determination module configured to determine whether the pressure in the chamber is lower than the pressure threshold; and a supply module configured to, in response to determining that the pressure in the chamber is lower than the pressure threshold, cause the gas supply device to supply supplementary gas to the chamber.

[0023] An embodiment of the fifth aspect of the present application provides a computing device, which includes at least one processor; and at least one memory communicatively connected to the at least one processor. The at least one memory stores instructions that, when executed by the at least one processor alone or jointly, cause the computing device to execute the method in the above embodiments.

[0024] An embodiment of the sixth aspect of the present application provides a computer-readable storage medium storing instructions that, when executed by one or more processors of a computing device alone or jointly, cause the computing device to execute the method in the above embodiments.

[0025] An embodiment of the seventh aspect of the present application provides a computer program product including instructions that, when executed by one or more processors of a computing device alone or jointly, cause the computing device to execute the method in the above embodiments.

[0026] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically describes the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the drawings, unless otherwise specified, the same reference numerals throughout the several views denote 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 accordance with the present application and should not be regarded as limiting the scope of the present application.

[0028] Figure 1 It is a schematic structural diagram of a battery gas generation detection system according to some embodiments of the present application;

[0029] Figure 2 It is a schematic structural diagram of a battery gas generation detection system according to other embodiments of the present application;

[0030] Figure 3A It is a top view schematic diagram of the box body of a battery test box according to some embodiments of the present application;

[0031] Figure 3B It is a front view schematic diagram of the box body of a battery test box according to some embodiments of the present application;

[0032] Figure 3C It is a schematic structural diagram of the cover plate of a battery test box according to some embodiments of the present application;

[0033] Figure 3D It is a schematic structural diagram of a seal of a battery test box according to some embodiments of the present application;

[0034] Figure 4Schematic flowchart of the battery gas generation detection method according to some embodiments of the present application;

[0035] Figure 5 Schematic flowchart of exhausting the original gas in the battery test box according to some embodiments of the present application;

[0036] Figure 6 Schematic flowchart of supplementing gas to the cavity according to some embodiments of the present application;

[0037] Figure 7 Exemplary block diagram of the battery gas generation detection device according to some embodiments of the present application;

[0038] Figure 8 Block diagram of an exemplary computing device that can be applied to exemplary embodiments;

[0039] Figure 9 Gas generation detection data of soft-pack lithium-ion batteries according to some embodiments of the present application.

[0040] Explanation of reference numerals:

[0041] 100 - Battery gas generation control system;

[0042] 110 - Gas supplementing device, 120 - Sampling device;

[0043] 1 - Controller, 2 - Pressure sensor, 3 - Gas source, 4 - First switching device, 5 - Cooling device, 6 - Fifth switching device, 7 - Filter device, 8 - Mass spectrometer, 9 - Battery test device, 10 - Battery test box, 11 - Battery under test, 12 - Second switching device, 13 - Third switching device, 14 - Fourth switching device;

[0044] a1 - First interface, a2 - Second interface, a3 - Third interface;

[0045] b1 - First electrode interface, b2 - Second electrode interface;

[0046] d - Mounting hole, e1 - First pressing piece, e2 - Second pressing piece, f - Box body, g - Sealing member, h - Cover plate, i - Chamber. Detailed implementation manners

[0047] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only 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 drawings are intended to cover non-exclusive inclusion.

[0049] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means more than two, unless otherwise specifically defined.

[0050] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0052] In the description of the embodiments of this application, the term "a plurality of" 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).

[0053] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element 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 this application.

[0054] In the description of the embodiments of the present application, unless otherwise clearly defined and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0055] At present, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also constantly increasing.

[0056] During the operation of the battery, gaseous by-products will be generated due to the reaction of the electrolyte material. The generation of gas inside the battery will cause the attenuation of the battery's electrochemical performance and easily lead to battery failure. At the same time, the reaction of the electrolyte material inside the battery may also generate flammable gases, increasing the safety hazards during the operation of the battery.

[0057] The current battery gas generation detection system often uses a purge injection method. The battery to be tested is connected to a mass spectrometer through a pipeline, and the gas to be tested generated by the battery to be tested is blown into the mass spectrometer by means of carrier gas blowing. However, with the progress of the detection, this detection system will destroy the gas atmosphere where the battery to be tested is located due to the frequent use of carrier gas to blow the gas to be tested, and the test environment where the battery to be tested is located deviates from the actual working conditions, affecting the accuracy of the detection results. The longer the detection time, the worse the accuracy of the detection results. This detection system cannot well adapt to the long-term battery gas generation detection.

[0058] At the same time, since carrier gas is required to send the gas to be tested into the mass spectrometer, this detection system occupies a relatively large space. At the same time, due to the large number of gas paths, the layout is relatively messy and the integration degree is low, there is a risk that the abnormal connection of the system caused by the operator's misoperation will affect the detection results.

[0059] Therefore, a battery gas generation detection system that can better simulate the real working conditions of battery gas generation and is suitable for long-term detection is needed.

[0060] The battery gas generation detection system disclosed in the embodiments of the present application can be but is not limited to the gas generation detection of batteries used in vehicles, ships, aircraft, etc. Using the detection system disclosed in the embodiments of the present application can improve the accuracy of the detection results in the case of long-term detection.

[0061] As Figures 1 to 3D shown, an embodiment of the present application provides a battery gas generation detection system 100, including:

[0062] A battery test box 10, the battery test box 10 includes a chamber i for placing a battery 11 to be tested;

[0063] A gas supplementing device 110, the gas supplementing device 110 is connected to the battery test box 10 and is used to supply supplementary gas to the chamber i according to the pressure in the chamber i;

[0064] A sampling device 120, the sampling device 120 is connected to the battery test box 10 and is used to collect the gas in the chamber i for battery gas generation analysis, and the gas in the chamber i includes at least one of the supplementary gas and the gas to be tested generated by the battery 11 to be tested.

[0065] Please refer to Figure 1 , the battery gas generation detection system 100 includes a battery test box 10, a gas supplementing device 110 and a sampling device 120.

[0066] When detecting the battery 11 to be tested, the battery 11 to be tested is placed in the chamber i inside the battery test box 10. The chamber i is used to accommodate at least one of the battery 11 to be tested, the gas to be tested generated by the battery 11 to be tested during detection, and the supplementary gas provided by the gas supplementing device 110.

[0067] During the detection process, the sampling device 120 collects the gas in the chamber i and sends it to an analytical instrument for analysis.

[0068] As the gas in the chamber i is collected, the pressure in the chamber i will gradually decrease and gradually deviate from the actual working condition of battery gas generation. At this time, the gas supplementing device 110 supplies supplementary gas to the chamber i according to the pressure in the chamber i. When the pressure in the chamber i is low, the gas supplementing device 110 supplies supplementary gas to the chamber i to gradually restore the pressure in the chamber i to normal and reduce the influence on the detection result.

[0069] Among them, the battery 11 to be tested can include various types of different batteries such as soft-pack batteries and hard-shell batteries (for example, cylindrical batteries, button batteries), and the supplementary gas can include inert gases such as argon that do not affect battery gas generation. The present disclosure does not limit this.

[0070] A gas supplementing device is provided in the detection system, which can supply supplementary gas to the chamber according to the pressure inside the chamber of the battery test box, so that the battery to be tested is in a normal working pressure state, and greatly reduce the evaporation rate of the electrolyte, thereby achieving the goal of non-destructive and long-time testing and improving the accuracy of the detection result.

[0071] According to some embodiments of the present application, please refer to Figure 2 , the gas replenishing device 110 includes:

[0072] A gas source 3 for supplying supplementary gas to the chamber i;

[0073] A first switching device 4, which is connected between the battery test box 10 and the gas source 3 and is configured to, when it is open, connect the gas source 3 to the chamber i, and when it is closed, disconnect the gas source 3 from the chamber i.

[0074] The gas replenishing device 120 includes a gas source 3 for providing supplementary gas and a first switching device 4 for controlling whether the battery test box 10 and the gas source 3 are connected.

[0075] In Figure 2 the illustrated example, the gas source 3 can be an argon gas source, and the first switching device 4 can be a two-way solenoid valve. When the first switching device 4 is open, the gas source 3 is connected to the chamber i of the battery test box 10, and the gas source 3 can fill the supplementary gas into the chamber i to achieve gas replenishment of the chamber i. When the pressure in the chamber i is normal, the first switching device 4 is closed, and the gas source 3 and the chamber i are isolated from each other, and the gas replenishment to the chamber i is stopped.

[0076] By opening and closing the first switching device, it is possible to control whether the supplementary gas provided by the gas source can enter the chamber, and it is possible to provide supplementary gas to the chamber according to the pressure inside the chamber.

[0077] According to some embodiments of the present application, please refer to Figure 2 , the gas replenishing device 110 further includes:

[0078] A pressure sensor 2 for communicating with the chamber i and detecting the pressure inside the chamber i;

[0079] A controller 1, which is connected to the pressure sensor 2 and the first switching device 4 and is configured to control the opening or closing of the first switching device 4 according to the detected pressure.

[0080] During the detection of battery gas production, the pressure sensor 2 detects the pressure inside the chamber i of the battery test box 10 and transmits the detection result to the controller 1.

[0081] When collecting more gas in the chamber i causes the pressure inside the chamber i to be low, the controller 1 controls the first switching device 4 to open, so that the supplementary gas enters the chamber i to restore the pressure inside the chamber i; when the pressure inside the chamber i is restored to meet the detection requirements, the controller controls the first switching device 4 to close and stops gas replenishment to the chamber i.

[0082] The pressure inside the chamber is detected using a pressure sensor, and the controller controls the first switching device according to the result detected by the pressure sensor, so as to supply supplementary gas to the chamber according to the pressure inside the chamber, and reduce the influence of the change of the test environment pressure on the detection result.

[0083] According to some embodiments of the present application, please refer to Figure 2 , the battery test box 10 further includes:

[0084] The first interface a1, through which the sampling device 120 is connected to the chamber i;

[0085] The second interface a2, through which the gas source 3 is connected to the chamber i;

[0086] The third interface a3, through which the pressure sensor 2 is connected to the chamber i.

[0087] Three interfaces are provided on the battery test box 10, and the first switching device 4, the pressure sensor 2 and the sampling device 120 in the gas supplementing device 110 are respectively connected to the chamber i of the battery test box 10 through the corresponding interfaces.

[0088] A plurality of interfaces are provided on the battery test box and are respectively connected to the sampling device, the first switching device and the pressure sensor, so that the interfaces do not interfere with each other and the accuracy of the detection result is improved. In addition, only one interface is provided on the battery test box for the sampling device, that is, the sampling device is used to extract the gas in the chamber for sampling. On the one hand, this can avoid the problems of poor time resolution and quantitative accuracy caused by the large volume of the battery test box using the traditional carrier gas blowing injection method, so as to improve the accuracy and time resolution of the qualitative and quantitative analysis of battery gas production. On the other hand, it can make the detection system of the present disclosure applicable to hard-shell battery cells (because the hard-shell battery cell only has one air outlet and no carrier gas port, so the battery test box using the traditional carrier gas blowing injection method cannot be used).

[0089] According to some embodiments of the present application, please refer to Figure 2 , the detection system 100 further includes:

[0090] The second switching device 12, through which the sampling device 120 is connected to the first interface a1;

[0091] The third switching device 13, through which the first switching device 4 is connected to the second interface a2;

[0092] The fourth switching device 14, through which the pressure sensor 2 is connected to the third interface a3.

[0093] There are corresponding switch devices respectively arranged outside the three interfaces of the battery test box 10. When the second switch device 12 is turned on, the first interface a1 is communicated with the sample introduction device 120; when the third switch device 13 is turned on, the second interface a2 is communicated with the first switch device 4; when the fourth switch device 14 is turned on, the third interface a3 is communicated with the pressure sensor 2. The second switch device, the third switch device and the fourth switch device can be valves such as two-way valves.

[0094] By arranging the switch device between each interface and the corresponding device, the on-off of the path between the interface and the corresponding device can be controlled according to the detection needs, improving the reliability and safety of the detection system.

[0095] According to some embodiments of the present application, the battery test box 10 further includes:

[0096] A box body f;

[0097] A cover plate h, and the cover plate h is used to enclose a chamber i with the box body f;

[0098] A seal g, and the seal g is arranged between the box body f and the cover plate h.

[0099] Please refer to Figures 3A - 3D , the battery test box 10 further includes a box body f, a cover plate h and a seal g.

[0100] In Figures 3A - 3D In the shown example, after the battery under test 11 is placed in the box body f and the relevant preparations for detection are made, the battery test box 10 needs to be installed so that the gas generated by the battery under test 11 can be accommodated in the chamber i. The cover plate h, the seal g and the box body f are fixedly connected. For example, fasteners can be used to connect the corresponding mounting holes d. The seal g is installed between the box body f and the cover plate h and is provided with mounting holes corresponding to the mounting holes of the box body f and the cover plate h to realize the fixation of the seal g.

[0101] In some embodiments, the mounting hole d is a threaded interface, and a fastening bolt is used to connect the corresponding threaded hole during installation.

[0102] In some embodiments, the seal g is made of a silicone gasket or a gasket made of other materials with better corrosion resistance, so as to alleviate the decrease in the sealing effect caused by the corrosion of the organic vapor on the seal.

[0103] By setting the battery test box to include a box body, a cover plate and a seal, it is convenient to operate the battery under test, and at the same time, the sealing performance of the battery test box is improved.

[0104] According to some embodiments of the present application, please refer to Figure 3A , the battery under test 11 includes a first electrode and a second electrode, and the battery test box 10 further includes:

[0105] A first pressing piece e1 and a second pressing piece e2 extending from the side wall of the cartridge body f into the chamber i, the first pressing piece e1 being for connection to the first electrode and the second pressing piece e2 being for connection to the second electrode.

[0106] As Figure 2 shown, the battery test cartridge 10 is further provided with a first electrode interface b1 and a second electrode interface b2 to lead out the positive and negative electrodes of the battery 11 to be tested to the outside of the battery test cartridge 10. As Figure 3A shown, a first pressing piece e1 and a second pressing piece e2 are correspondingly provided at the first electrode interface b1 and the second electrode interface b2.

[0107] The first pressing piece e1 and the second pressing piece e2 can be respectively connected to the first electrode and the second electrode of the battery to be tested.

[0108] By providing a pressing piece for connection to the battery electrode in the battery test cartridge, it is easy to achieve conduction with the pressing piece when the battery to be tested is placed in the mold, improving the convenience of operation.

[0109] According to some embodiments of the present application, the detection system 100 further includes:

[0110] A battery test device 9, the battery test device 9 being connected to the first pressing piece e1 and the second pressing piece e2 and being for applying a voltage and a current to the battery 11 to be tested.

[0111] As Figure 2 and Figure 3A shown, the battery test device 9 is connected to the first pressing piece e1 and the second pressing piece e2 through the first electrode interface b1 and the second electrode interface b2, so that the positive electrode of the battery test device 9 is connected to the positive electrode of the battery 11 to be tested, and the negative electrode of the battery test device 9 is connected to the negative electrode of the battery 11 to be tested.

[0112] When detecting the gas production of the battery, the battery test device 9 applies the required voltage and current to the battery to be tested according to the detection requirements.

[0113] The battery test device applies a voltage and a current to the battery to be tested through the pressing piece, and can apply different voltages and currents to the battery to be tested according to the detection requirements, so as to detect the gas production of the battery to be tested under various working conditions.

[0114] According to some embodiments of the present application, the sample introduction device 120 includes at least one of the following:

[0115] A fifth switching device 6, the fifth switching device 6 being configured to communicate with the chamber i when it is open and to be disconnected from the chamber i when it is closed;

[0116] A cooling device 5, the cooling device 5 being for cooling the collected gas;

[0117] Filter device 7, and the filter device 7 is used to filter the collected gas.

[0118] In some embodiments, the cooling device 5 may use a cold trap to cool the collected gas, so that the organic vapor that may exist in the collected gas is cooled and adsorbed, reducing the interference with the detection result.

[0119] In some embodiments, the fifth switching device 6 may use a micro-injection valve, and its injection flow rate can be selected according to the respective test requirements of different types of batteries with different gas production rates. For example, a micro-injection valve with a flow rate of 1 μL to 10 μL / min can be used. In one example, the opening or closing of the micro-injection valve is controlled by the pressure difference between the mass spectrometer 8 and the chamber i of the battery test cartridge 10. When the pressure difference between the mass spectrometer 8 and the chamber i reaches the opening pressure difference of the micro-injection valve, the micro-injection valve opens and communicates with the chamber i, and the gas in the chamber i can be collected. In addition, the fifth switching device may also be other switching devices that can be controlled to open or close.

[0120] In some embodiments, the filter device 7 may use a filter with a filter element, and the pore size of the filter element can be selected according to the test requirements to filter the particulate impurities that may exist in the collected gas, reducing the interference with the detection result. In one example, the pore size of the filter element can be set to 2 μm.

[0121] In Figure 2 In the illustrated example, the sampling device 120 includes a cooling device 5, a fifth switching device 6, and a filter device 7. During the actual detection process, it can be selected according to the needs of the detection environment. For example, the sampling device 120 may only include the cooling device 5, may only include the fifth switching device 6, may also only include the filter device 7, or may also only include any two of the cooling device 5, the fifth switching device 6, and the filter device 7. And there is no limitation on the installation order of the cooling device 5, the fifth switching device 6, and the filter device 7 in the sampling device 120. Taking Figure 2 as an example, the gas to be tested in the battery test cartridge 10 can pass through the fifth switching device 6, the cooling device 5, and the filter device 7 in sequence, or can pass through the cooling device 5, the filter device 7, and the fifth switching device 6 in sequence, or can also pass through at least one of the cooling device 5, the fifth switching device 6, and the filter device 7 in other orders. The present disclosure does not limit this.

[0122] By using the sampling device, it is possible to collect the gas in the chamber according to the detection requirements without using a carrier gas for injection, reducing the space occupied by the detection system and improving the accuracy of the detection result at the same time.

[0123] According to some embodiments of the present application, the refrigeration methods of the cooling device 5 include at least one of the following: electric refrigeration, liquid nitrogen refrigeration, or dry ice refrigeration.

[0124] When detecting the gas production of the battery, a cooling device 5 with different refrigeration methods can be selected.

[0125] According to the detection requirements and the environment where the detection system is located, different refrigeration methods are used, improving the adaptability of the detection system to various detection scenarios.

[0126] An embodiment of the present application provides a battery detection box 10 for the detection system 100 in the above embodiment. Please refer to Figures 3A - 3D , the battery detection box 10 includes:

[0127] A box body f;

[0128] A cover plate h, and the cover plate h is used to enclose a chamber i for accommodating the battery 11 to be tested with the box body f;

[0129] Among them, the following are provided on the box body f:

[0130] A first interface a1, and the sampling device 120 is communicated with the chamber i through the first interface a1;

[0131] A second interface a2, and the gas supplement device 110 is communicated with the chamber i through the second interface a2.

[0132] Please refer to Figures 3A to 3D , the battery test box 10 includes a box body f and a cover plate h. A first interface a1 and a second interface a2 respectively connected to the sampling device 120 and the gas supplement device 110 are provided on the box body f.

[0133] The battery test box is provided with an interface for the gas supplement device. Through this interface, the gas supplement device can supply supplementary gas to the chamber according to the pressure inside the chamber of the battery test box, so that the battery to be tested is in a normal working pressure state, and the evaporation rate of the electrolyte is greatly reduced, thereby achieving the goal of non-destructive and long-term testing and improving the accuracy of the detection results. In addition, only one interface is provided for the sampling device on the battery test box to be applicable to the sampling method of the sampling device using the pressure difference between the mass spectrometer and the chamber for the gas in the chamber. On the one hand, it can avoid the problems of poor time resolution and quantitative accuracy caused by the large volume of the battery test box using the traditional carrier gas blowing injection method, so as to improve the accuracy and time resolution of the qualitative and quantitative analysis of battery gas production. On the other hand, it enables the battery test box to be applicable not only to soft-pack batteries but also to hard-shell battery cores (because the hard-shell battery core only has one air outlet and no carrier gas port, so the battery test box using the traditional carrier gas blowing injection method cannot be used).

[0134] An embodiment of the present application provides a detection method 400 for the detection system 100 in the above embodiment. Please refer to Figure 4 , the detection method 400 includes:

[0135] Step 410: Cause the sampling device 120 to collect the gas in chamber i of the battery test box 10, where the gas in chamber i includes at least one of the supplementary gas and the gas to be measured generated by the battery under test.

[0136] Step 420: Determine whether the pressure in chamber i is lower than the pressure threshold.

[0137] Step 430: In response to determining that the pressure in chamber i is lower than the pressure threshold, cause the gas supply device 110 to supply supplementary gas to chamber i.

[0138] During the detection of battery gas production, the sampling device 120 collects the gas in chamber i of the battery test box 10. During the detection process, the pressure in chamber i is monitored. When the collected gas is relatively large and the pressure in chamber i is lower than the pressure threshold, it indicates that the environment where the battery under test 11 is located has deviated significantly from the normal working condition, and the risk of inaccurate detection results is relatively high. Therefore, the gas supply device 110 is caused to supply gas to chamber i.

[0139] Among them, the pressure threshold can be set according to the detection requirements.

[0140] Cause the sampling device to collect the gas in the chamber, and according to the pressure inside the chamber of the battery test box, cause the gas supply device to supply supplementary gas to the chamber, so that the battery under test is in a normal working pressure state, and the accuracy of the detection result is improved.

[0141] According to some embodiments of the present application, the detection method 400 further includes:

[0142] Cause the mass spectrometer 8 to analyze the collected gas.

[0143] The gas contained in the battery test box 10 is collected by the sampling device 120 and then sent to the mass spectrometer 8. The mass spectrometer 8 analyzes the collected gas to obtain the detection result of battery gas production.

[0144] Use the mass spectrometer to detect the gas to be measured collected by the sampling device to realize the mass spectrometry analysis of battery gas production.

[0145] According to some embodiments of the present application, please refer to Figure 5 , the detection method 400 further includes process 500:

[0146] Step 510, before the sampling device 120 collects the gas in chamber i of the battery test cartridge 10, the gas supply device 110 supplies supplementary gas to chamber i of the battery test cartridge 10.

[0147] Step 520, in response to the gas signal in the mass spectrometer 8 being in a steady state, the battery test device 9 applies voltage and current to the battery under test 11.

[0148] Before the detection, chamber i of the battery test cartridge 10 is not a vacuum environment, but there will be some original gases. These gases will interfere with the detection results. Therefore, before starting the detection, it is necessary to evacuate them.

[0149] The gas supply device 110 supplies supplementary gas to chamber i of the battery test cartridge 10 to push the original gas into the mass spectrometer 8. As the supplementary gas entering chamber i increases, the original gas will be gradually discharged. The mass spectrometer 8 analyzes the gas entering it. When the gas signal in the mass spectrometer 8 is in a steady state, it means that the gas at this time is pure supplementary gas and the original gas has been exhausted, and the detection of the battery under test can begin.

[0150] At this time, the battery test device 9 applies voltage and current to the battery under test 11 to start detecting the gas generated by the battery.

[0151] Before detecting the battery under test, by supplying supplementary gas to the chamber, the original gas in the chamber is evacuated. When the gas signal in the mass spectrometer is in a steady state, it indicates that the original gas in the chamber has been exhausted. At this time, the detection of the battery under test can begin, reducing the interference of the original gas in the chamber on the detection results and improving the accuracy of the detection results.

[0152] According to some embodiments of the present application, the detection method 400 further includes:

[0153] Based on the result of analyzing the collected gas, using the correspondence between the ratio of the gas to be measured and the supplementary gas and the analysis result of the mass spectrometer 8, determine the quantity of the gas to be measured in the collected gas, wherein the correspondence is obtained by analyzing multiple groups of sample gases collected by the sampling device 120 by the mass spectrometer 8, and multiple groups of sample gases have corresponding preset ratios of the gas to be measured and the supplementary gas.

[0154] Send multiple groups of sample gases into the sampling device 120, wherein the ratio of the gas to be tested in each group of sample gases is different.

[0155] Use the mass spectrometer 8 to analyze multiple groups of sample gases to obtain multiple groups of analysis results corresponding to the multiple groups of sample gases.

[0156] Since the ratios of the gas to be measured and the supplementary gas in each group of sample gases are different, the corresponding relationship between the two can be obtained based on the ratios of the gas to be measured and the supplementary gas in multiple groups of sample gases and the corresponding analysis results of the mass spectrometer 8. In some embodiments, a standard curve can be established according to the corresponding relationship, and the standard curve is used to indicate the corresponding relationship between the ratio of the gas to be tested and the analysis results of the mass spectrometer 8.

[0157] When detecting the battery 11 to be tested, based on the analysis results obtained by the mass spectrometer 8 and in combination with the corresponding relationship between the ratio of the gas to be measured and the supplementary gas and the analysis results of the mass spectrometer 8, the ratio of the gas to be measured and the supplementary gas can be confirmed. Since the pressure and volume of the chamber i of the battery test box 10 are both known, the quantity of the gas to be measured therein can be determined through calculation.

[0158] By analyzing multiple groups of sample gases to obtain the corresponding relationship between the ratio of the gas to be measured and the supplementary gas and the analysis results of the mass spectrometer, when obtaining the detection results of the battery to be tested, the quantity of the gas to be measured can be obtained based on this corresponding relationship, improving the convenience of the detection process.

[0159] According to some embodiments of the present application, please refer to Figure 6 , step 430 includes:

[0160] Step 610, in response to determining that the pressure in chamber i is lower than the pressure threshold, open the first switching device 4 of the gas replenishing device 110 so that the supplementary gas from the gas source 3 enters chamber i.

[0161] Step 620, in response to determining that the pressure in chamber i is not lower than the pressure threshold, close the first switching device 4 so that the supplementary gas from the gas source 3 stops entering chamber i.

[0162] When the pressure in chamber i is lower than the pressure threshold, control the first switching device 4 to open. At this time, the gas source 3 is connected to the battery test box 10, and the supplementary gas enters chamber i for gas replenishment.

[0163] When the pressure in chamber i is not lower than the pressure threshold, control the first switching device 4 to close. At this time, the gas source 3 is isolated from the battery test box 10, and the supplementary gas no longer enters chamber i, stopping gas replenishment.

[0164] Controlling the opening or closing of the first switching device according to the pressure in the chamber can achieve providing supplementary gas to the chamber only when the pressure in the chamber is relatively low.

[0165] The embodiments of the present application provide a detection device 700 for the above detection system. Please refer to Figure 7 , the detection device 700 includes an acquisition module 710, a determination module 720, and a providing module 730.

[0166] A sampling module 710, configured to enable a sampling device to sample a gas in chamber i of a battery test cartridge for a mass spectrometer to analyze the sampled gas, where the gas in chamber i includes at least one of a supplementary gas and a gas to be measured generated by a battery under test.

[0167] A determination module 720, configured to determine whether the pressure in chamber i is lower than a pressure threshold.

[0168] A supply module 730, configured to, in response to determining that the pressure in chamber i is lower than the pressure threshold, cause a gas supply device to supply a supplementary gas to chamber i.

[0169] The sampling module 710, determination module 720, and supply module 730 in the detection device 700 may respectively correspond to steps 410 to 430 in the detection method 400 as shown in Figure 4 For the sake of brevity, they will not be elaborated here. It should be understood that corresponding to the embodiments of the detection method 400, the embodiments of the detection device 700 may further include more modules.

[0170] It should be noted that the functions of the various modules discussed herein can be divided into multiple modules, and / or at least some functions of multiple modules can be combined into a single module. The specific modules discussed herein that perform actions include the specific module itself performing the action, or alternatively the specific module invoking or otherwise accessing another component or module that performs the action (or performs the action in combination with the specific module). Therefore, the specific module that performs the action may include the specific module itself that performs the action and / or another module that the specific module invokes or otherwise accesses and performs the action.

[0171] It should also be understood that various technologies can be described herein in the general context of software-hardware elements or program modules. The various modules described above Figure 7 can be implemented in hardware or in hardware in combination with software and / or firmware. For example, these modules can be implemented as computer program code / instructions configured to be executed in one or more processors and stored in a computer-readable storage medium. Alternatively, these modules can be implemented as hardware logic / circuits. The hardware logic / circuits can include an integrated circuit chip (which includes one or more components such as a processor (e.g., a Central Processing Unit (CPU), a microcontroller, a microprocessor, a Digital Signal Processor (DSP), etc.), a memory, one or more communication interfaces, and / or other circuits), and can optionally execute the received program code and / or include embedded firmware to perform functions.

[0172] Embodiments of the present application provide a computing device. The computing device includes: at least one processor; and at least one memory communicatively coupled to the at least one processor, the at least one memory storing instructions that, when executed alone or jointly by the at least one processor, cause the computing device to execute the detection method 400. The computing device is, for example, as Figure 8 the computing device 800 shown. Figure 8 FIG. shows an example configuration of a computing device 800 that can be used to implement the methods described herein.

[0173] The computing device 800 may include at least one processor 805, a memory 807, (multiple) communication interfaces 802, a display device 801, other input / output (I / O) devices 803, and one or more mass storage devices 806 that can communicate with each other, such as via a system bus 804 or other suitable connections. Instructions are stored on the memory 807 that, when executed by the processor 805, cause the processor 805 to execute the method in the above embodiments.

[0174] The computing device 800 can be various different types of devices. Examples of the computing device 800 include but are not limited to: desktop computers, server computers, laptop or netbook computers, mobile devices (e.g., tablets, cellular or other wireless phones (e.g., smartphones), notepad computers, mobile stations), wearable devices (e.g., glasses, watches), entertainment devices (e.g., entertainment appliances, set-top boxes communicatively coupled to a display device, game consoles), televisions or other display devices, automotive computers, and the like.

[0175] The processor 805 can be a single processing unit or multiple processing units, and all processing units can include a single or multiple computing units or multiple cores. The processor 805 can be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuits, and / or any device that manipulates signals based on operation instructions. Among other capabilities, the processor 805 can be configured to obtain and execute computer-readable instructions stored in the memory 807, the mass storage device 806, or other computer-readable media, such as program code of an operating system 808, program code of an application 809, program code of other programs 810, and the like.

[0176] Memory 807 and mass storage device 806 are examples of computer-readable storage media for storing instructions that are executed by processor 805 to implement the various functions described above. For example, memory 807 generally may include both volatile and non-volatile memory (e.g., RAM, ROM, etc.). In addition, mass storage device 806 generally may include a hard disk drive, solid state drive, removable media, including external and removable drives, memory cards, flash memory, floppy disks, optical disks (e.g., CD, DVD), storage arrays, network attached storage, storage area network, etc. Memory 807 and mass storage device 806 may both be collectively referred to herein as memory or computer-readable storage media, and may be non-transitory media capable of storing computer-readable, processor-executable program instructions as computer program code that can be executed by processor 805 as a particular machine configured to implement the operations and functions described in the examples herein.

[0177] Multiple programs may be stored on mass storage device 806. These programs include operating system 808, one or more application programs 809, other programs 810, and program data 811, and they may be loaded into memory 807 for execution. Examples of such application programs or program modules may include, for example, computer program logic (e.g., computer program code or instructions) for implementing the following components / functions: detection device 700 (including acquisition module 710, determination module 720, and provision module 730), detection method 400 (including any suitable steps of method 400), and / or additional embodiments described herein.

[0178] Although illustrated as being stored in memory 807 of computing device 800 in Figure 8 , the operating system 808, application programs 809, other programs 810, and program data 811, or portions thereof, may be implemented using any form of computer-readable medium accessible by computing device 800.

[0179] One or more communication interfaces 802 are used to exchange data with other devices, such as via a network, a direct connection, etc. Such communication interfaces can be one or more of the following: any type of network interface (e.g., network interface card (NIC)), wired or wireless (such as IEEE 802.11 wireless local area network (WLAN)) wireless interface, Worldwide Interoperability for Microwave Access (WiMAX) interface, Ethernet interface, Universal Serial Bus (USB) interface, cellular network interface, BluetoothTM interface, Near Field Communication (NFC) interface, etc. The communication interface 802 can facilitate communication within a variety of network and protocol types, including wired networks (e.g., LAN, cable, etc.) and wireless networks (e.g., WLAN, cellular, satellite, etc.), the Internet, etc. The communication interface 802 can also provide communication with external storage devices (not shown) such as in storage arrays, network-attached storage, storage area networks, etc.

[0180] In some examples, a display device 801 such as a monitor can be included to display information and images to a user. Other I / O devices 803 can be devices that receive various inputs from a user and provide various outputs to the user, and can include touch input devices, gesture input devices, cameras, keyboards, remote controls, mice, printers, audio input / output devices, etc.

[0181] The techniques described herein can be supported by these various configurations of the computing device 800 and are not limited to the specific examples of the techniques described herein. For example, the functionality can also be implemented in whole or in part on a "cloud" using a distributed system. The cloud includes and / or represents a platform for resources. The platform abstracts the underlying functionality of the hardware (e.g., servers) and software resources of the cloud. Resources can include applications and / or data that can be used when performing computing processing on servers remote from the computing device 800. Resources can also include services provided via the Internet and / or via a subscriber network such as a cellular or Wi-Fi network. The platform can abstract the resources and functionality to connect the computing device 800 with other computing devices. Thus, the implementation of the functionality described herein can be distributed throughout the cloud. For example, the functionality can be implemented partially on the computing device 800 and partially via a platform that abstracts the functionality of the cloud.

[0182] The embodiments of the present application also provide a computer-readable storage medium having instructions stored thereon, which when executed by a processor, cause the processor to execute the method in any of the above embodiments.

[0183] A computer-readable storage medium includes volatile and non-volatile, removable and non-removable media implemented by any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. The computer-readable storage medium includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD), or other optical storage devices, magnetic cassettes, magnetic tapes, magnetic disk storage devices or other magnetic storage devices, or any other non-transmission medium that can be used to store information for access by a computing device.

[0184] An embodiment of the present application also provides a computer program product, including instructions that, when executed by a processor, cause the processor to execute the method in any of the above embodiments.

[0185] A specific embodiment of the present application is described below. It should be understood that this specific embodiment is described only for illustrative purposes and should not be construed as a limitation of the present application.

[0186] As Figure 2 shown, the battery gas generation detection system 100 includes a battery test box 10, a gas replenishing device 110, a sampling device 120, a mass spectrometer 8, a battery test device 9, and two-way valves 12, 13, and 14. Among them, the gas replenishing device 110 includes a controller 1, a pressure sensor 2, an argon gas source 3, and a two-way solenoid valve 4. The sampling device 120 includes a cold trap 5, a micro-sampling valve 6, and a filter 7.

[0187] The battery test box 10 is provided with a first interface a1, a second interface a2, a third interface a3, a first electrode interface b1, and a second electrode interface b2. The micro-sampling valve 6 is connected to the first interface a1 through the two-way valve 12, the two-way solenoid valve 4 is connected to the second interface a2 through the two-way valve 13, and the pressure sensor 2 is connected to the third interface a3 through the two-way valve 14. The positive electrode of the battery test device 9 is connected to the battery test box 10 through the first electrode interface b1, and the negative electrode is connected to the battery test box 10 through the second electrode interface b2.

[0188] Taking the pouch lithium-ion battery to be tested 11 as an example, the pouch lithium-ion battery is assembled in an argon glove box, and a small hole is opened in the aluminum-plastic film of the pouch lithium-ion battery so that the generated gas can be directly discharged into the battery test box 10. Connect the positive electrode of the pouch lithium-ion battery to the first pressing piece e1 provided on the box body f of the battery test box 10, and connect the negative electrode of the pouch lithium-ion battery to the second pressing piece e2. Place the seal g between the cover plate h and the box body f, and use fastening bolts to connect the corresponding threaded interfaces d on the box body f, the seal g, and the cover plate h. The two-way valves 12, 13, and 14 are respectively connected to the first interface a1, the second interface a2, and the third interface a3 of the battery test box 10. Keep the two-way valves 12, 13, and 14 all in the closed state to achieve the sealing of the battery test box 10. The above process is all completed in the argon glove box.

[0189] Transfer the battery test box 10 containing the pouch lithium-ion battery out of the argon glove box. Connect the two-way valve 13 and the two-way solenoid valve 4, connect the two-way valve 14 and the pressure sensor 2, connect the two-way valve 12 and the micro-syringe valve 6, and the battery test box 10 is electrically connected to the battery test system 9 through the first electrode interface b1 and the second electrode interface b2.

[0190] Since there may be some impure gases in the pipelines of the battery test box 10 and the sampling device 120, they need to be removed completely. First, open the two-way valves 12 and 13, and the controller 1 controls the two-way solenoid valve 4 and the micro-syringe valve 6 to open. At this time, the argon gas in the argon gas source 3 will sequentially pass through the two-way solenoid valve 4, the two-way valve 13, the battery test box 10, the two-way valve 12, the micro-syringe valve 6, the cold trap 5, and the filter 7 and reach the mass spectrometer 8. When the gas signal in the mass spectrometer 8 is stable and there is no impure gas, it means that the impure gases in the pipelines of the battery test box 10 and the sampling device 120 have been removed completely, and the pouch lithium-ion battery can be detected.

[0191] Set the voltage and current output by the battery test system 9 to the voltage value and current value required for detection, and detect the pouch lithium-ion battery. During the test, the two-way valves 12, 13, and 14 remain connected. The gas generated by the pouch lithium-ion battery will sequentially pass through the two-way valve 12, the micro-syringe valve 6, the cold trap 5, and the filter 7 and reach the mass spectrometer 8. As the sampling device 120 collects the gas, the air pressure in the chamber i of the battery test box 10 will continuously decrease. When the pressure sensor 2 detects that the pressure in the chamber i is lower than the set pressure threshold, the controller 1 controls the two-way solenoid valve 4 to open according to the detection signal of the pressure sensor 2, and the argon gas in the argon gas source 3 will sequentially pass through the two-way solenoid valve 4 and the two-way valve 13 to replenish gas to the battery test box 10. When the pressure in the chamber i returns to the pressure threshold, the controller 1 controls the two-way solenoid valve 4 to close. Such a cycle is carried out to keep the pouch lithium-ion battery at a normal working air pressure.

[0192] During the test, the mass spectrometer 8 will obtain a series of ion fragments of the gas to be measured generated by the soft-pack lithium-ion battery and their current (or pressure) signals. The type of the gas to be measured can be determined according to the mass-to-charge ratio of the ion fragments.

[0193] Multiple groups of mixed gases containing argon and different proportions of the gas to be measured are sent into the sampling device 120, and the proportions of argon and the gas to be measured in the mixed gas are known. According to the current (or pressure) signals obtained by the mass spectrometer 8 for each group of mixed gases, a corresponding relationship curve between the proportion of argon and the gas to be measured and the current (or pressure) signals is established. According to the corresponding relationship curve and the current (or pressure) signal of the mass spectrometer 8, the proportion of the gas to be measured in the chamber i of the battery test box 10 can be determined. Since the pressure and volume of the chamber i of the battery test box 10 are known, the quantity of the gas to be measured generated by the soft-pack lithium-ion battery at different times can be calculated.

[0194] The detection result of the battery gas production is as Figure 9 shown. Since no carrier gas is used during the detection process, Figure 9 there is no interference signal introduced by the carrier gas in the detection result, and the change process of gas consumption and generation can be clearly reflected.

[0195] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery gas generation detection system, characterized in that, Comprising: A battery test box, the battery test box including a chamber for placing a battery to be tested; A gas supplement device, the gas supplement device being connected to the battery test box and being configured to supply supplementary gas to the chamber according to the pressure in the chamber; And A sampling device, the sampling device being connected to the battery test box and being configured to collect the gas in the chamber for battery gas production analysis, the gas in the chamber including at least one of the supplementary gas and the gas to be tested generated by the battery to be tested.

2. The detection system according to claim 1, wherein The gas supplement device includes: A gas source for supplying supplementary gas to the chamber; and A first switching device, the first switching device being connected between the battery test box and the gas source and being configured to, when it is open, communicate the gas source with the chamber, and when it is closed, disconnect the gas source from the chamber.

3. The detection system according to claim 2, wherein, The gas supplement device further includes: A pressure sensor for communicating with the chamber and detecting the pressure in the chamber; and A controller, the controller being connected to the pressure sensor and the first switching device and being configured to control the opening or closing of the first switching device according to the detected pressure.

4. The detection system according to claim 3, wherein The battery test box further includes: A first interface, the sampling device communicating with the chamber through the first interface; A second interface, the gas source communicating with the chamber through the second interface; and A third interface, the pressure sensor communicating with the chamber through the third interface.

5. The detection system according to claim 4, characterized in that, It further includes: A second switching device, the sampling device being connected to the first interface through the second switching device; A third switching device, the first switching device being connected to the second interface through the third switching device; And A fourth switching device, the pressure sensor being connected to the third interface through the fourth switching device.

6. The detection system according to any one of claims 1-5, characterized in that, The battery test box further includes: A box body; A cover plate, the cover plate being used to enclose the chamber with the box body; and A seal, the seal being disposed between the box body and the cover plate.

7. The detection system according to claim 6, wherein The battery to be tested includes a first electrode and a second electrode, and the battery test box further includes: a first pressing piece and a second pressing piece extending from the side wall of the box body into the chamber, the first pressing piece being used to connect with the first electrode, and the second pressing piece being used to connect with the second electrode.

8. The detection system according to claim 7, wherein It further includes: A battery test device, the battery test device being connected to the first pressing piece and the second pressing piece and being configured to apply voltage and current to the battery to be tested.

9. The detection system according to any one of claims 1-5, characterized in that, The sampling device includes at least one of the following: A fifth switching device, the fifth switching device being configured to communicate with the chamber when it is open and disconnect from the chamber when it is closed; A cooling device, the cooling device being used to cool the collected gas; And A filtering device, the filtering device being used to filter the collected gas.

10. The detection system according to claim 8, wherein The refrigeration method of the cooling device includes at least one of the following: electric refrigeration, liquid nitrogen refrigeration, or dry ice refrigeration.

11. A battery detection box for a detection system according to any one of claims 1 to 10, characterized in that Comprising: A box body; And A cover plate, the cover plate being used to enclose a chamber for accommodating a battery to be tested with the box body; Wherein, the following are provided on the box body: A first interface, through which the sampling device communicates with the chamber; and A second interface, through which the gas supplement device communicates with the chamber.

12. A detection method for a detection system according to any one of claims 1 to 11, characterized in that, It includes: Making the sampling device collect the gas in the chamber of the battery test box, where the gas in the chamber includes at least one of the supplementary gas and the gas to be measured generated by the battery to be tested; Determining whether the pressure in the chamber is lower than the pressure threshold; And In response to determining that the pressure in the chamber is lower than the pressure threshold, making the gas supplement device supply supplementary gas to the chamber.

13. The detection method according to claim 12, characterized in that, It further includes: Making a mass spectrometer analyze the collected gas.

14. The detection method according to claim 13, wherein It further includes: Before making the sampling device collect the gas in the chamber of the battery test box, making the gas supplement device supply supplementary gas to the chamber of the battery test box; And In response to the gas signal in the mass spectrometer being in a stable state, making the battery test device apply voltage and current to the battery to be tested.

15. The detection method according to claim 13 or 14, characterized in that, It further includes: Based on the result of analyzing the collected gas, using the correspondence between the ratio of the gas to be measured and the supplementary gas and the analysis result of the mass spectrometer, determining the quantity of the gas to be measured in the collected gas, where the correspondence is obtained by analyzing multiple groups of sample gases collected by the sampling device by the mass spectrometer, and the multiple groups of sample gases have corresponding preset ratios of the gas to be measured and the supplementary gas.

16. The detection method according to any one of claims 12-14, characterized in that, The making the gas supplement device supply supplementary gas to the chamber in response to determining that the pressure in the chamber is lower than the pressure threshold includes: In response to determining that the pressure in the chamber is lower than the pressure threshold, making the first switching device of the gas supplement device open so that the supplementary gas from the gas source enters the chamber; and In response to determining that the pressure in the chamber is not lower than the pressure threshold, making the first switching device close so that the supplementary gas from the gas source stops entering the chamber.

17. A detection device for a detection system according to any one of claims 1 to 11, characterized in that, It includes: A collection module configured to make the sampling device collect the gas in the chamber of the battery test box for the mass spectrometer to analyze the collected gas, where the gas in the chamber includes at least one of the supplementary gas and the gas to be measured generated by the battery to be tested; A determination module configured to determine whether the pressure in the chamber is lower than the pressure threshold; And A supply module configured to, in response to determining that the pressure in the chamber is lower than the pressure threshold, make the gas supplement device supply supplementary gas to the chamber.

18. A computing device, characterized in that, It includes: At least one processor; And At least one memory communicatively connected to the at least one processor, where the at least one memory stores instructions that, when executed alone or jointly by the at least one processor, cause the computing device to execute the method according to any one of claims 13 to 16.

19. A computer-readable storage medium, characterized in that, Stored with instructions that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to execute the method according to any one of claims 13 to 16.

20. A computer program product, characterized in that, Comprising instructions that, when executed alone or jointly by one or more processors of a computing device, cause the computing device to perform the method according to any one of claims 13 to 16.

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