Lithium ion battery in-situ gas production detection device

Abstract

The utility model relates to the technical field of batteries, and provides a lithium ion battery in-situ gas production detection device which comprises a test box, a battery, a liquid injection system, a temperature control system and a detection system, the test box comprises a box body and a box cover, and a closed inner cavity used for arranging the battery can be formed between the box body and the box cover; the liquid injection system comprises a liquid injection pipe, and the liquid injection pipe is communicated with the closed inner cavity; the temperature control system comprises a battery testing device and a temperature probe, the battery testing device is electrically connected with the battery, and the detection end of the temperature probe is arranged in the closed inner cavity; the detection system comprises a guide pipe, one end of the guide pipe is communicated with the battery, and the other end of the guide pipe extends out of the test box. According to the scheme, the simulation test of the gas production of the battery can be carried out, and the gas production condition of the battery can be mastered more comprehensively by acquiring the corresponding test data.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to an in-situ gas generation detection device for lithium-ion batteries. Background Technology

[0002] Lithium-ion batteries have been widely used in portable electronic devices, new energy vehicles, and home or large-scale industrial energy storage systems due to their advantages such as high energy density, high power density, long cycle life, no memory effect, and environmental friendliness. However, lithium-ion batteries produce gas due to the redox decomposition of the electrolyte and the decomposition of the SEI film, which can lead to cell swelling, battery performance failure, and even safety accidents. Therefore, a more comprehensive understanding of the gas production of batteries at different stages is needed. Utility Model Content

[0003] In order to overcome at least one of the disadvantages of the prior art, the purpose of this application is to provide an in-situ gas generation detection device for lithium-ion batteries.

[0004] The technical means adopted in this application to solve the above-mentioned technical problems are:

[0005] This application provides an in-situ gas generation detection device for lithium-ion batteries, comprising:

[0006] A test chamber, comprising a chamber body and a lid, wherein a sealed inner cavity can be formed between the chamber body and the lid;

[0007] The battery is disposed within the sealed inner cavity;

[0008] The liquid injection system includes a liquid injection tube that communicates with the sealed inner cavity;

[0009] A temperature control system, comprising a battery testing device and a temperature probe, wherein the battery testing device is electrically connected to the battery and the probe tip of the temperature probe is disposed in the sealed inner cavity;

[0010] The detection system includes a conduit, one end of which is connected to the battery and the other end extends out of the test chamber.

[0011] In some embodiments, the opening of the box body is provided with a flange structure, and the box cover is fitted onto the flange structure;

[0012] A sealing ring is provided between the flange structure and the box lid;

[0013] Fasteners are provided between the box body and the box cover.

[0014] In some embodiments, the injection tube is used to inject a heat-insulating medium into the sealed inner cavity;

[0015] The battery is immersed in the insulation medium.

[0016] In some embodiments, the injection tube passes through the tank cover and is sealed to the tank cover;

[0017] The injection tube is equipped with a first control valve.

[0018] In some embodiments, the battery testing device includes a first electrode and a second electrode, wherein the first electrode and the second electrode are respectively connected to the terminals of the battery;

[0019] The first electrode and the second electrode pass through the box cover and are sealed to the box cover.

[0020] In some embodiments, the temperature probe passes through the box cover and is sealed to the box cover;

[0021] And / or, the conduit passes through the box cover and is sealed to the box cover.

[0022] In some embodiments, the temperature control system further includes a heating device for heating the enclosure;

[0023] The heating device is electrically connected to the temperature probe.

[0024] In some embodiments, the detection system further includes a flow measurement device in communication with the conduit.

[0025] In some embodiments, the detection system further includes a gas composition measuring system, which is connected to the conduit.

[0026] In some embodiments, the protruding end of the conduit is provided with a multi-port connector, and the flow measuring device and the gas composition measuring system are respectively connected to the multi-port connector;

[0027] A second control valve is provided between the flow measurement device and the multi-port connector;

[0028] A third control valve is provided between the gas composition measurement system and the multi-port connector.

[0029] Compared with the prior art, the solution of this application has at least the following beneficial effects:

[0030] In this application, the test chamber provides a sealed cavity for placing the battery and conducting subsequent gas generation tests. The liquid injection system injects a heat-insulating medium into the sealed cavity to maintain temperature during the gas generation test. The temperature control system controls the temperature of the sealed cavity and the battery according to the gas generation test requirements, simulating battery gas generation conditions. The detection system facilitates the directional output of the generated gas, enabling subsequent analysis to obtain relevant experimental data. Attached Figure Description

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is a schematic diagram of the system composition of an in-situ gas generation detection device for lithium-ion batteries, as exemplified in this application.

[0033] Marker explanation:

[0034] 1-Test box, 11-Box body, 111-Flanged structure, 12-Box cover, 13-Sealed inner cavity, 14-Fasteners;

[0035] 2-Battery;

[0036] 3-Injection system, 31-Injection pipe, 32-First control valve;

[0037] 41-Battery testing device; 411-First electrode wire; 412-Second electrode wire; 42-Temperature probe; 43-Heating device;

[0038] 51-Conduit, 511-Multi-port connector, 52-Flow measurement device, 521-Second control valve, 53-Gas composition measurement system, 531-Third control valve. Detailed Implementation

[0039] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of the present invention; the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. Similar reference numerals and letters denote similar items in the following figures; therefore, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] like Figure 1 As shown, this embodiment provides an in-situ gas generation detection device for lithium-ion batteries, comprising:

[0042] Test chamber 1, the test chamber 1 includes a chamber body 11 and a chamber cover 12, and a sealed inner cavity 13 can be formed between the chamber body 11 and the chamber cover 12;

[0043] Battery 2 is disposed in the sealed inner cavity 13;

[0044] Injection system 3, the injection system 3 includes injection tube 31, the injection tube 31 is connected to the sealed inner cavity 13;

[0045] A temperature control system is provided, comprising a battery testing device 41 and a temperature probe 42. The battery testing device 41 is electrically connected to the battery 2, and the probe end of the temperature probe 42 is disposed in the sealed inner cavity 13.

[0046] The detection system includes a conduit 51, one end of which is connected to the battery 2, and the other end extends out of the test chamber 1.

[0047] In some embodiments, the sealed inner cavity 13 is formed by the lid 12 and the box body 11 being fitted together; therefore, except for the opening that fits with the lid 12, the rest of the wall surface of the box body 11 is a complete wall surface, and the wall surface at the opening of the lid 12 and the box body 11 that fits together is also a complete wall surface.

[0048] In some embodiments, a transparent observation window may be provided on the side wall of the housing 11 or the lid 12; however, the provision of the transparent observation window shall not compromise the sealing of the walls of the housing 11 or the lid 12.

[0049] In some embodiments, the battery 2 can be understood as a liquid battery, a semi-solid battery, a quasi-solid battery, or an all-solid battery; such as a common prismatic battery. In this case, the conduit 51 is sealed and connected to the casing of the battery 2 for receiving gas inside the casing of the battery 2.

[0050] As one application example, the opening of the box 11 is provided with a flange structure 111, and the box cover 12 is attached to the flange structure 111.

[0051] A sealing ring is provided between the flange structure 111 and the box cover 12;

[0052] Fasteners 14 are provided between the box body 11 and the box cover 12.

[0053] In some embodiments, such as Figure 1 As shown, the flange structure 111 is configured to extend toward the inside of the housing 11.

[0054] In some embodiments, the flange structure 111 is configured to extend toward the outside of the housing 11.

[0055] In some embodiments, the cross-sectional shape between the flange structure 111 and the vertical wall of the box 11 is "T" shaped, that is, the flange structure 111 extends to both the inner and outer sides of the box 11.

[0056] The flange structure 111 provides an increased contact area between the box body 11 and the box cover 12, thereby improving the installation stability between the box cover 12 and the box body 11.

[0057] In some embodiments, the sealing ring may also be in the form of a sealing gasket. For example, the sealing gasket may be laid on the contact surface between the housing 11 and the lid 12.

[0058] In some embodiments, the fastener 14 is a bolt. The fastener 14 enables the removable mounting of the cover 12 onto the housing 11.

[0059] As one application example, the injection tube 31 is used to inject a heat-insulating medium into the sealed inner cavity 13;

[0060] The battery 2 is immersed in the insulation medium.

[0061] In some embodiments, the heat-insulating medium may be set as a high-boiling-point heat-insulating medium such as kerosene or paraffin oil.

[0062] In some embodiments, depending on the experimental requirements, the battery 2 may be partially immersed in the insulation medium or completely submerged in the insulation medium.

[0063] As one application example, the injection tube 31 passes through the box cover 12 and is sealed to the box cover 12;

[0064] The injection pipe 31 is equipped with a first control valve 32.

[0065] The injection process can be controlled by the first control valve 32. By setting the injection pipe 31 on the box cover 12, the installation of the injection pipe 31 can be facilitated. Compared with setting the injection pipe 31 on the box body 11, the overall structure can be simpler and easier to process and manufacture.

[0066] As one application example, the battery testing device 41 includes a first electrode wire 411 and a second electrode wire 412, which are respectively connected to the terminals of the battery 2.

[0067] The first electrode 411 and the second electrode 412 pass through the box cover 12 and are sealed to the box cover 12.

[0068] By setting the first electrode 411 and the second electrode 412 on the cover 12, the overall structural design of the device can be simplified and the processing can be made more convenient. The battery testing device 41 can be used in conjunction with the heat insulation medium in the sealed inner cavity 13 to control the state of the battery 2, so as to simulate the application conditions of the battery 2 and detect the gas production of the battery 2 at different stages.

[0069] As one application example, the temperature probe 42 is inserted through the box cover 12 and is sealed to the box cover 12;

[0070] And / or, the conduit 51 passes through the box cover 12 and is sealed to the box cover 12.

[0071] In some embodiments, the temperature probe 42 is mounted on the box cover 12.

[0072] In some embodiments, the detection end of the temperature probe 42 extends below the liquid surface of the insulation medium, so that the current temperature detection result can be more intuitive.

[0073] In some embodiments, the conduit 51 is installed on the box cover 12.

[0074] At this point, the external components such as the temperature probe 42, conduit 51, first electrode 411, second electrode 412, and injection tube 31 are all centrally mounted on the box cover 12. This allows for centralized structural processing of the box cover 12 based on the mounting structure, and subsequent installation of the various external components on the box cover 12, making it more convenient to use.

[0075] As one application example, the temperature control system further includes a heating device 43 for heating the housing 11;

[0076] The heating device 43 is electrically connected to the temperature probe 42.

[0077] In some embodiments, the heating device 43 is configured as an electromagnetic heating device.

[0078] In some embodiments, the operating temperature range of the enclosure 11 is set between 35-80°C.

[0079] The heating device 43 facilitates the heating of the insulation medium, enabling the test conditions to quickly reach the set requirements. The temperature probe 42 can detect the temperature of the insulation medium and is associated with the heating device 43 to achieve feedback and control of the actual temperature.

[0080] As one application example, the detection system also includes a flow measurement device 52, which is connected to the conduit 51.

[0081] In some embodiments, the flow measurement device 52 is configured as a gas flow meter.

[0082] The flow measurement device 52 can be used to measure and record the gas flow rate generated in real time during the experiment.

[0083] As one application example, the detection system also includes a gas composition measurement system 53, which is connected to the conduit 51.

[0084] In some embodiments, the structure of the gas composition measurement system 53 may refer to the prior art, and will not be described in detail here.

[0085] As one application example, the tube 51 has a multi-port connector 511 at one of its extended ends, and the flow measuring device 52 and the gas composition measuring system 53 are respectively connected to the multi-port connector 511.

[0086] A second control valve 521 is provided between the flow measurement device 52 and the multi-port connector 511;

[0087] A third control valve 531 is provided between the gas composition measurement system 53 and the multi-port connector 511.

[0088] In some embodiments, the multi-port connector 511 is configured as a tee connector.

[0089] The second control valve 521 can be used to control the connection between the flow measurement device 52 and the conduit 51; the third control valve 531 can be used to control the connection between the gas composition measurement system 53 and the conduit 51.

[0090] Compared with the prior art, the solution of this embodiment has at least the following beneficial effects:

[0091] In this embodiment, the test chamber 1 provides a sealed cavity 13 for placing the battery 2 and conducting subsequent gas generation tests. The liquid injection system 3 injects a heat-insulating medium into the sealed cavity 13 to maintain temperature during the gas generation test. The temperature control system controls the temperature of the sealed cavity 13 and the battery 2 according to the gas generation test requirements, simulating the gas generation conditions of the battery 2. The detection system facilitates the directional output of the generated gas, enabling subsequent analysis to obtain relevant experimental data. This allows for battery testing under different temperature conditions, with real-time monitoring of gas generation and composition. The acquired gas generation data can be used to optimize the battery material system, electrolyte system, and cell structure design, improving battery life and safety.

[0092] The above description is merely a specific embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should also be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0093] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A lithium-ion battery in-situ gas generation detection device, characterized in that, include: A test chamber, comprising a chamber body and a lid, wherein a sealed inner cavity can be formed between the chamber body and the lid; The battery is disposed within the sealed inner cavity; The liquid injection system includes a liquid injection tube that communicates with the sealed inner cavity; A temperature control system, comprising a battery testing device and a temperature probe, wherein the battery testing device is electrically connected to the battery and the probe tip of the temperature probe is disposed in the sealed inner cavity; The detection system includes a conduit, one end of which is connected to the battery and the other end extends out of the test chamber.

2. The lithium-ion battery in-situ gas generation detection device according to claim 1, characterized in that, The opening of the box is provided with a flange structure, and the box cover is fitted onto the flange structure. A sealing ring is provided between the flange structure and the box lid; Fasteners are provided between the box body and the box cover.

3. The lithium-ion battery in-situ gas generation detection device according to claim 1 or 2, characterized in that, The injection tube is used to inject a heat-insulating medium into the sealed inner cavity; The battery is immersed in the insulation medium.

4. The lithium-ion battery in-situ gas generation detection device according to claim 3, characterized in that, The injection tube passes through the tank cover and is sealed to the tank cover; The injection tube is equipped with a first control valve.

5. The lithium-ion battery in-situ gas generation detection device according to claim 1 or 4, characterized in that, The battery testing device includes a first electrode and a second electrode, which are respectively connected to the terminals of the battery. The first electrode and the second electrode pass through the box cover and are sealed to the box cover.

6. The lithium-ion battery in-situ gas generation detection device according to claim 5, characterized in that, The temperature probe is inserted through the box cover and is sealed to the box cover; And / or, the conduit passes through the box cover and is sealed to the box cover.

7. The lithium-ion battery in-situ gas generation detection device according to claim 6, characterized in that, The temperature control system also includes a heating device for heating the enclosure; The heating device is electrically connected to the temperature probe.

8. The lithium-ion battery in-situ gas generation detection device according to claim 1 or 7, characterized in that, The detection system also includes a flow measurement device, which is connected to the conduit.

9. The lithium-ion battery in-situ gas generation detection device according to claim 8, characterized in that, The detection system also includes a gas composition measurement system, which is connected to the conduit.

10. The lithium-ion battery in-situ gas generation detection device according to claim 9, characterized in that, The tube is provided with a multi-port connector at one of its extended ends, and the flow measurement device and the gas composition measurement system are respectively connected to the multi-port connector; A second control valve is provided between the flow measurement device and the multi-port connector; A third control valve is provided between the gas composition measurement system and the multi-port connector.

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