Gas production detection device

Abstract

A gas production detection device belongs to the technical field of batteries. The gas production detection device comprises: a positive electrode container; a negative electrode container; and an isolation member configured to isolate the solvent and gas of the electrolyte in the positive electrode container and the negative electrode container, and configured to conduct ions. According to the technical scheme, gas generated by the positive electrode and the negative electrode can be collected and detected more accurately.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a gas generation detection device. Background Art

[0002] With the increasing environmental pollution, the new energy industry has attracted more and more attention. In the new energy industry, battery technology is an important factor related to its development.

[0003] The development of battery technology needs to consider various design factors, such as reliability, energy density, cycle stability, capacity, etc. During the use of the battery, gas is generated inside the battery, which in turn causes the battery to expand. The battery expansion is crucial for the reliability and cycle stability of the battery. Based on this, it is necessary to analyze the gas generation in the battery in order to improve and enhance the performance of the battery subsequently. Therefore, how to provide a gas generation detection device to more accurately collect and detect the gas generated by the positive electrode and the negative electrode is a technical problem to be solved urgently. Summary of the Utility Model

[0004] The embodiments of the present application provide a gas generation detection device to more accurately collect and detect the gas generated by the positive electrode and the negative electrode.

[0005] The embodiments of the present application provide a gas generation detection device, including: a positive electrode container; a negative electrode container; an isolation component, where the isolation component is configured to isolate the solvents and gases of the electrolytes in the positive electrode container and the negative electrode container, and the isolation component is configured to conduct ions.

[0006] In the embodiments of the present application, the isolation component is used to isolate the electrolytes and gases in the positive electrode container and the negative electrode container. In this way, the risk that the electrolyte in the positive electrode container flows into the negative electrode container and the risk that the electrolyte in the negative electrode container flows into the positive electrode container can be reduced. Furthermore, the risk that the gas dissolved in the solvent of the electrolyte diffuses from the positive electrode container to the negative electrode container or from the negative electrode container to the positive electrode container can be reduced; the risk that the gas in the positive electrode container diffuses to the negative electrode container and the risk that the gas in the negative electrode container diffuses to the positive electrode container can also be reduced. The isolation component can also conduct ions, so that it is convenient for ions to migrate between the positive electrode container and the negative electrode container, thereby facilitating the generation of gas in the positive electrode container and the negative electrode container. Therefore, the gas generation detection device of the embodiments of the present application can more accurately collect the gas generated in the positive electrode container and the negative electrode container respectively.

[0007] In a possible implementation manner, the material of the isolation component has pores, the pores are less than or equal to 0.5 nm, and / or, the lithium ion conductivity of the material of the isolation component is 10 -6 S / cm~10 -2S / cm. In this way, the isolation component can block the passage of the solvent in the electrolyte and allow the passage of ions, which is beneficial to the reactions in the positive electrode container and the negative electrode container, and can reduce the risk of gas diffusion from the positive electrode container to the negative electrode container and the risk of gas diffusion from the negative electrode container to the positive electrode container.

[0008] In a possible implementation, the lithium-ion conductivity of the material of the isolation component is 10 -4 S / cm to 10 -3 S / cm. In this way, the isolation component has a high lithium-ion conductivity, which is convenient for the transmission and diffusion of lithium ions, and thus convenient for the reactions in the positive electrode container and the negative electrode container.

[0009] In a possible implementation, the gas generation detection device is provided with a connection component, and the positive electrode container and the negative electrode container are communicated through the connection component; the connection component includes a positive electrode connection part, a negative electrode connection part and the isolation component, the positive electrode connection part is arranged on one side of the positive electrode container facing the negative electrode container, the negative electrode connection part is arranged on one side of the negative electrode container facing the positive electrode container, the positive electrode connection part is communicated with the negative electrode connection part, and the isolation component is arranged between the positive electrode connection part and the negative electrode connection part.

[0010] In the above technical solution, through the setting of the connection component, it is convenient for the positive electrode container and the negative electrode container to be communicated, and thus convenient for the transmission of ions (such as lithium ions), and convenient for the reactions in the positive electrode container and the negative electrode container; the ions in the positive electrode container can diffuse to the negative electrode connection part through the positive electrode connection part and the isolation component, and enter the negative electrode container through the negative electrode connection part; the ions in the negative electrode container can diffuse to the positive electrode connection part through the negative electrode connection part and the isolation component, and enter the positive electrode container through the positive electrode connection part; by arranging the isolation component between the positive electrode connection part and the negative electrode connection part, it is convenient for the transmission and diffusion of ions.

[0011] In a possible implementation, the isolation component is an isolation sheet arranged between the positive electrode connection part and the negative electrode connection part. In this way, it is convenient to clamp the isolation component in the middle through the positive electrode connection part and the negative electrode connection part to isolate the positive electrode container and the negative electrode container.

[0012] In a possible implementation, the positive electrode connection part and the positive electrode container are of an integral structure, and the negative electrode connection part and the negative electrode container are of an integral structure; or, the positive electrode connection part and the positive electrode container are of a split structure, and the negative electrode connection part and the negative electrode container are of a split structure. In this way, the positive electrode container and the negative electrode container can be isolated by arranging the isolation component between the positive electrode connection part and the negative electrode connection part.

[0013] In a possible implementation, a first sealing member is provided between the positive electrode connection portion and the isolation member, and / or a first sealing member is provided between the negative electrode connection portion and the isolation member.

[0014] In the above technical solution, by providing the first sealing member, the risk of gas leakage from the positive electrode container and the negative electrode container to the outside of the gas production detection device can be reduced, which is conducive to more accurately collecting the gas produced in the positive electrode container and the negative electrode container.

[0015] In a possible implementation, the positive electrode container is provided with a positive electrode mounting portion for loading positive electrode active material; the negative electrode container is provided with a negative electrode mounting portion for loading negative electrode active material; the positive electrode mounting portion, the negative electrode mounting portion, and the connection assembly are disposed at the same height.

[0016] In the above technical solution, the positive electrode mounting portion is used to load the positive electrode active material, and the negative electrode mounting portion is used to load the negative electrode active material, so that it is convenient for the generation of gas in the positive electrode container and the negative electrode container; the positive electrode mounting portion, the negative electrode mounting portion, and the connection assembly are disposed at the same height, which is conducive to reducing the length of the transmission path of ions between the positive electrode container and the negative electrode container, improving the efficiency of the generated gas, and further improving the efficiency of the gas production detection device in collecting the produced gas.

[0017] In a possible implementation, the gas production detection device further includes a positive electrode guide post and a negative electrode guide post; the positive electrode container includes a positive electrode sealing cover and a positive electrode housing, the positive electrode sealing cover covers the positive electrode housing to form the positive electrode container, and the positive electrode sealing cover is provided with a positive electrode guide post opening for the positive electrode guide post to pass through; the negative electrode container includes a negative electrode sealing cover and a negative electrode housing, the negative electrode sealing cover covers the negative electrode housing to form the negative electrode container, and the negative electrode sealing cover is provided with a negative electrode guide post opening for the negative electrode guide post to pass through.

[0018] In the above technical solution, the positive electrode guide post and the negative electrode guide post are used to connect with the battery test device, which is convenient for controlling the gas production in the positive electrode container and the negative electrode container through the battery test device; the positive electrode sealing cover is provided with a positive electrode guide post opening for the positive electrode guide post to pass through, and the negative electrode sealing cover is provided with a negative electrode guide post opening for the negative electrode guide post to pass through, which is convenient for fixing the positive electrode guide post on the positive electrode sealing cover and fixing the negative electrode guide post on the negative electrode sealing cover.

[0019] In a possible implementation, the positive electrode post includes a positive electrode extending portion and a positive electrode inserting portion. The positive electrode extending portion extends out of the positive electrode sealing cover, and the positive electrode inserting portion extends into the positive electrode container. The positive electrode installing portion is provided on the positive electrode inserting portion; the negative electrode post includes a negative electrode extending portion and a negative electrode inserting portion. The negative electrode extending portion extends out of the negative electrode sealing cover, and the negative electrode inserting portion extends into the negative electrode container. The negative electrode installing portion is provided on the negative electrode inserting portion.

[0020] In the above technical solution, the positive electrode extending portion and the negative electrode extending portion are used to connect with the battery testing device; the positive electrode inserting portion extends into the positive electrode container and is provided with the positive electrode installing portion, so as to facilitate placing the positive electrode active material in the positive electrode container and facilitating the generation of gas in the positive electrode container; the negative electrode inserting portion extends into the negative electrode container and is provided with the negative electrode installing portion, so as to facilitate placing the negative electrode active material in the negative electrode container and facilitating the generation of gas in the negative electrode container.

[0021] In a possible implementation, the positive electrode installing portion is a first groove provided on the positive electrode inserting portion, and the negative electrode installing portion is a second groove provided on the negative electrode inserting portion. Through the setting of the first groove and the second groove, it is convenient to load the positive electrode active material more firmly on the positive electrode inserting portion and the negative electrode active material more firmly on the negative electrode inserting portion, so as to more accurately simulate the gas production situation in the battery, which is beneficial to more accurately collect the gas generated in the positive electrode container and the negative electrode container.

[0022] In a possible implementation, the material of the positive electrode post includes aluminum, and the material of the negative electrode post includes copper. In this way, it is beneficial to reduce the risk of reaction between the positive electrode post and the positive electrode plate and the risk of reaction between the negative electrode post and the negative electrode plate, which is beneficial to more accurately simulate the gas production situation in the battery and is beneficial to more accurately collect the gas generated in the positive electrode container and the negative electrode container.

[0023] In a possible implementation, the gas production detection device further includes a second sealing member. The second sealing member is provided between the positive electrode housing and the positive electrode sealing cover, and / or the second sealing member is provided between the negative electrode housing and the negative electrode sealing cover. Through the setting of the second sealing member, the risk of gas leakage from the positive electrode container and the negative electrode container to the outside of the gas production detection device can be reduced, which is further beneficial to more accurately collect the gas produced in the positive electrode container and the negative electrode container.

[0024] In a possible implementation, the positive electrode housing is provided with a first air inlet, and the positive electrode sealing cover is provided with a first air outlet; the negative electrode housing is provided with a second air inlet, and the negative electrode sealing cover is provided with a second air outlet.

[0025] In the above technical solution, through the settings of the first air inlet and the second air inlet, it is convenient to introduce inert gas into the positive electrode container and the negative electrode container through the first air inlet and the second air inlet respectively before using the gas production detection device to collect the produced gas, and then evacuate the residual gas in the positive electrode container and the negative electrode container through the first air outlet and the second air outlet, which is convenient for more accurate analysis of the gas generated in the positive electrode container and the negative electrode container; in addition, the gas generated in the positive electrode container and the negative electrode container can also be collected through the first air outlet and the second air outlet.

[0026] In a possible implementation manner, along the height direction of the gas production detection device, the first air inlet is arranged at one end of the positive electrode housing close to the positive electrode sealing cover, and the second air inlet is arranged at one end of the negative electrode housing close to the negative electrode sealing cover.

[0027] In a possible implementation manner, along the height direction of the gas production detection device, the height of the first air inlet is greater than or equal to the height of the electrolyte injected into the positive electrode container, and the height of the second air inlet is greater than or equal to the height of the electrolyte injected into the negative electrode container.

[0028] Through the above settings, the risk that the gas introduced through the first air inlet and the second air inlet is dissolved in the electrolyte can be reduced, which is beneficial to more accurate analysis of the gas generated in the positive electrode container and the negative electrode container.

[0029] In a possible implementation manner, the gas production detection device further includes a stirring component, and the stirring component is arranged in the positive electrode container and the negative electrode container. Stirring with the stirring component can reduce the solubility of the gas in the electrolyte, thereby facilitating more accurate collection of the generated gas.

[0030] In a possible implementation manner, the stirring component is arranged at the bottom of the positive electrode container and the bottom of the negative electrode container. In this way, a better stirring effect can be achieved.

[0031] In a possible implementation manner, the rotation speed of the stirring component is 100 r / min to 5000 r / min.

[0032] When the rotation speed is greater than or equal to 100 r / min, a better stirring effect can be achieved; when the rotation speed is less than or equal to 5000 r / min, the risk of serious convection caused by too fast rotation speed can be reduced.

[0033] In a possible implementation manner, the rotation speed of the stirring component is 200 r / min to 300 r / min. In this way, a better stirring effect can be achieved while reducing convection.

[0034] In a possible implementation, the material of the isolation component includes at least one of gel polymer, ceramic, nanoporous material or ion sieve molecular membrane. The gel polymer includes polyethylene glycol. The ceramic includes at least one of montmorillonite, zirconia or alumina. The nanoporous material includes molecular sieve. The ion sieve molecular membrane includes polyethylene oxide containing lithium salt. The isolation device prepared with the above materials can play a role in conducting ions, and at the same time can also play a role in blocking the electrolyte and gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the drawings.

[0036] Figure 1 Schematic diagram of a gas generation detection device according to an embodiment of the present application;

[0037] Figure 2 Schematic diagram of a connection component according to an embodiment of the present application;

[0038] Figure 3 Schematic diagram of another perspective of a gas generation detection device according to an embodiment of the present application;

[0039] Figure 4 Schematic diagram of a positive electrode guide post according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The embodiments of the gas generation detection device of the present application are described in detail with appropriate reference to the drawings, but there may be cases where unnecessary details are omitted. For example, there are cases where the detailed description of well-known matters and the repeated description of actually identical structures are omitted. This is to avoid the following description from becoming unnecessarily long and to facilitate the understanding of those skilled in the art. In addition, the drawings and the following description are provided for those skilled in the art to fully understand the present application, and are not intended to limit the subject matter recited in the claims.

[0041] The "ranges" disclosed in this application are defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of a particular range. The ranges defined in this way can include the end values or not include the end values, and can be combined arbitrarily, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, ranges of 60-110 and 80-120 are also contemplated. In addition, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise specified, the numerical range "a-b" represents an abbreviated representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are fully listed herein, and "0-5" is only an abbreviated representation of these numerical combinations. In addition, when stating that a certain parameter is an integer ≥2, it is equivalent to disclosing that the parameter is, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0042] If there is no special instruction, all embodiments and optional embodiments of this application can be combined with each other to form a new technical solution.

[0043] If there is no special instruction, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0044] If there is no special instruction, all steps of this application can be carried out in sequence or randomly, preferably in sequence. For example, the method includes steps (a) and (b), which means that the method can include steps (a) and (b) carried out in sequence, or can also include steps (b) and (a) carried out in sequence. For example, it is mentioned that the method may further include step (c), which means that step (c) can be added to the method in any order. For example, the method can include steps (a), (b), and (c), or can also include steps (a), (c), and (b), or can also include steps (c), (a), and (b), etc.

[0045] The development of battery technology needs to consider various design factors, such as reliability, energy density, cycle stability, capacity, etc. During the use of the battery, the negative electrode and the positive electrode in the battery will react with the electrolyte to generate gas, which may cause excessive pressure inside the battery, reducing the reliability of the battery. In addition, it may also have an adverse impact on the electrical performance of the battery, such as cycle stability, capacity, etc. Therefore, understanding the reasons and states of gas generation inside the battery has an important impact on the design and use strategy of the battery.

[0046] In a battery, the reactions that occur between the positive electrode and the electrolyte are different from those that occur between the negative electrode and the electrolyte. For example, oxidation reactions mainly occur at the positive electrode, and reduction reactions mainly occur at the negative electrode. There are differences in the types and volumes of gases generated by the reactions between the positive electrode and the electrolyte and those between the negative electrode and the electrolyte. In some gas generation detection devices, the gases collected by the gas generation detection device cannot distinguish or cannot accurately distinguish the gases generated by the positive electrode and the negative electrode. As a result, it is difficult to accurately and independently analyze the effects of gas generation at the positive electrode and gas generation at the negative electrode on the performance of the battery, and the guiding effect on the design and practical strategies of the battery is weak.

[0047] In view of this, the present application provides a gas generation detection device, including an isolation component, which can isolate the gases generated by the positive electrode and the negative electrode, so as to facilitate the gas generation detection device to separately collect and detect the gases generated by the positive electrode and the negative electrode.

[0048] [Gas generation detection device]

[0049] Figure 1 It is a schematic diagram of the gas generation detection device according to an embodiment of the present application. Figure 2 It is a schematic diagram of the connection component according to an embodiment of the present application.

[0050] Combined with Figure 1 and Figure 2 As shown, an embodiment of the present application provides a gas generation detection device 1, including a positive electrode container 11, a negative electrode container 12, and an isolation component 103. The isolation component 103 is configured to isolate the solvent and gas of the electrolyte in the positive electrode container 11 and the negative electrode container 12, and the isolation component 103 is configured to conduct ions.

[0051] The gas generation detection device 1 can be used to collect the gases in the positive electrode container 11 and the negative electrode container 12, and after collection, the collected gases can be detected by an external device or a detection component in the gas generation detection device 1 to determine the types and volumes of the gases.

[0052] During the use of the gas generation detection device 1, the positive electrode container 11 serves as a container for the reaction between the positive electrode and the electrolyte. During the reaction between the positive electrode and the electrolyte, gases are generated. The isolation component 103 can reduce the risk of the gases in the positive electrode container 11 entering the negative electrode container 11. In addition, some of the gases generated by the reaction between the positive electrode and the electrolyte will dissolve in the solvent of the electrolyte. The isolation component 103 can reduce the risk of the electrolyte in the positive electrode container 11 entering the negative electrode container 12, thereby reducing the risk of oxygen dissolved in the solvent of the electrolyte in the positive electrode container 11 entering the negative electrode container 12.

[0053] During the use of the gas generation detection device 1, the negative electrode container 12 serves as the container for the reaction between the negative electrode and the electrolyte. During the reaction between the negative electrode and the electrolyte, gas is generated. The isolation component 103 can reduce the risk of the gas in the negative electrode container 12 entering the positive electrode container 11. In addition, some of the gas generated by the reaction between the negative electrode and the electrolyte will dissolve in the solvent of the electrolyte. The isolation component 103 can reduce the risk of the electrolyte in the negative electrode container 12 entering the positive electrode container 11, thereby reducing the risk of oxygen dissolved in the electrolyte in the negative electrode container 12 entering the positive electrode container 11.

[0054] The shapes of the positive electrode container 11 and the negative electrode container 12 can be cuboid, cube, cylinder, or any other irregular shape. The embodiments of the present application include but are not limited to this.

[0055] The shape of the isolation component 103 can be plate-shaped, sheet-shaped, or irregular. The embodiments of the present application include but are not limited to this.

[0056] In the embodiments of the present application, the isolation component 103 is used to isolate the solvent and gas of the electrolyte in the positive electrode container 11 and the negative electrode container 12. In this way, the risk of the electrolyte in the positive electrode container 11 flowing into the negative electrode container 12 and the electrolyte in the negative electrode container 12 flowing into the positive electrode container 11 can be reduced. Furthermore, the risk of the gas dissolved in the electrolyte diffusing from the positive electrode container 11 to the negative electrode container 12 or from the negative electrode container 12 to the positive electrode container 11 can be reduced; the risk of the gas in the positive electrode container 11 diffusing into the negative electrode container 12 and the gas in the negative electrode container 12 diffusing into the positive electrode container 11 can also be reduced. The isolation component 103 can also conduct ions, so that it is convenient for ions to migrate between the positive electrode container 11 and the negative electrode container 12, thereby facilitating the generation of gas in the positive electrode container 11 and the negative electrode container 12. Therefore, the gas generation detection device 1 in the embodiments of the present application can more accurately collect the gas generated in the positive electrode container 11 and the negative electrode container 12 respectively.

[0057] In some embodiments, the material of the isolation component 103 has pores, and the pores are less than or equal to 0.5 nm, and / or, the lithium ion conductivity of the material of the isolation component 103 is 10 -6 S / cm~10 -2 S / cm.

[0058] The material of the isolation component 103 is the material for preparing the isolation component 103. The voids of the material of the isolation component 103 can be 0.5 nm, 0.4 nm, 0.3 nm, or smaller values. In this way, the passage of solvent molecules in the electrolyte can be blocked, thereby reducing the diffusion of the gas dissolved in the solvent of the electrolyte between the positive electrode container 11 and the negative electrode container 12.

[0059] The lithium ion conductivity of the material of the isolation component 103 can be 10-6 S / cm, 10 -5 S / cm, 10 -4 S / cm, 10 -3 S / cm, 10 -2 S / cm or any value within the above range. In this way, lithium ions in the positive electrode container 11 and the negative electrode container 12 can pass through the isolation member 103, thereby facilitating the reactions in the positive electrode container 11 and the negative electrode container 12.

[0060] In the above embodiments, the isolation member 103 can block the passage of the solvent in the electrolyte and allow the passage of ions, which is beneficial to the reactions in the positive electrode container 11 and the negative electrode container 12, and can reduce the risk of gas diffusion from the positive electrode container 11 to the negative electrode container 12 and the risk of gas diffusion from the negative electrode container 12 to the positive electrode container 11.

[0061] In some embodiments, the lithium ion conductivity of the material of the isolation member 103 is 10 -4 S / cm to 10 -3 S / cm. In this way, the isolation member 103 has a high lithium ion conductivity, which facilitates the transmission and diffusion of lithium ions, and thus facilitates the reactions in the positive electrode container 11 and the negative electrode container 12.

[0062] In some embodiments, the gas generation detection device 1 is provided with a connection assembly 10, and the positive electrode container 11 and the negative electrode container 12 are connected through the connection assembly 10. Through the setting of the connection assembly 10, the connection between the positive electrode container 11 and the negative electrode container 12 is facilitated, thereby facilitating the transmission of ions (such as lithium ions) and facilitating the reactions in the positive electrode container 11 and the negative electrode container 12.

[0063] The connection assembly 10 includes a positive electrode connection portion 101, a negative electrode connection portion 102, and an isolation member 103. The positive electrode connection portion 101 is disposed on one side of the positive electrode container 11 facing the negative electrode container 12, the negative electrode connection portion 102 is disposed on one side of the negative electrode container 12 facing the positive electrode container 11, the positive electrode connection portion 101 communicates with the negative electrode connection portion 102, and the isolation member 103 is disposed between the positive electrode connection portion 101 and the negative electrode connection portion 102.

[0064] The positive electrode connection part 101 is arranged on one side of the positive electrode container 11 facing the negative electrode container 12, and the positive electrode connection part 101 communicates with the positive electrode container 11; the negative electrode connection part 102 is arranged on one side of the negative electrode container 12 facing the positive electrode container 11, and the negative electrode connection part 102 communicates with the negative electrode container 12. The positive electrode connection part 101 communicates with the negative electrode connection part 102, so that it is convenient for the positive electrode container 11 and the negative electrode container 12 to communicate. The isolation component 103 is arranged between the positive electrode connection part 101 and the negative electrode connection part 102. In this way, the isolation component 103 can prevent gas and electrolyte from passing through the isolation component 103 while facilitating the passage of ions through the isolation component 103, thus facilitating the reaction between the positive electrode in the positive electrode container 11 and the electrolyte and the reaction between the negative electrode in the negative electrode container 12 and the electrolyte.

[0065] In the above technical solution, the ions in the positive electrode container 11 can diffuse to the negative electrode connection part 102 through the positive electrode connection part 101 and the isolation component 103, and enter the negative electrode container 12 through the negative electrode connection part 102; the ions in the negative electrode container 12 can diffuse to the positive electrode connection part 101 through the negative electrode connection part 102 and the isolation component 103, and enter the positive electrode container 11 through the positive electrode connection part 101; by arranging the isolation component 103 between the positive electrode connection part 101 and the negative electrode connection part 102, the transmission and diffusion of ions are facilitated.

[0066] In some embodiments, the isolation component 103 is an isolation sheet arranged between the positive electrode connection part 101 and the negative electrode connection part 102. In this way, it is convenient to clamp the isolation component 103 between the positive electrode connection part 101 and the negative electrode connection part 102 to isolate the positive electrode container 11 and the negative electrode container 12.

[0067] In some embodiments, the positive electrode connection part 101 and the positive electrode container 11 are of an integral structure, and the negative electrode connection part 102 and the negative electrode container 12 are of an integral structure; or, the positive electrode connection part 101 and the positive electrode container 11 are of a split structure, and the negative electrode connection part 102 and the negative electrode container 12 are of a split structure. In this way, the isolation of the positive electrode container 11 and the negative electrode container 12 can be realized by arranging the isolation component 103 between the positive electrode connection part 101 and the negative electrode connection part 102.

[0068] As an example, the connection assembly 10 is a pipeline, and the two ends of the pipeline are respectively connected to the positive electrode container 11 and the negative electrode container 12 to realize the communication between the positive electrode container 11 and the negative electrode container 12.

[0069] As another example, an opening is provided on the wall forming the positive electrode container 11, and an opening is provided on the wall forming the negative electrode container 11. These two openings are opposite and communicate to form the connection assembly 10, thereby realizing the communication between the positive electrode container 11 and the negative electrode container 12.

[0070] In some embodiments, the connection component 10 further includes a first sealing member 104. The first sealing member 104 is disposed between the positive electrode connection portion 101 and the isolation member 103, and / or the first sealing member 104 is disposed between the negative electrode connection portion 102 and the isolation member 103.

[0071] As an example, the first sealing member 104 is disposed between the positive electrode connection portion 101 and the isolation member 103, and the first sealing member 104 is disposed between the negative electrode connection portion 102 and the isolation member 103. In this way, the connection component 10 has good sealing performance, and can reduce the risk of gas and electrolyte in the positive electrode container 11 and the negative electrode container 12 leaking to the outside of the positive electrode container 11 and the negative electrode container 12.

[0072] As an example, the first sealing member 104 is disposed between the positive electrode connection portion 101 and the isolation member 103, and the first sealing member 104 is not disposed between the negative electrode connection portion 102 and the isolation member 103.

[0073] As an example, the first sealing member 104 is not disposed between the positive electrode connection portion 101 and the isolation member 103, and the first sealing member 104 is disposed between the negative electrode connection portion 102 and the isolation member 103.

[0074] The shape of the first sealing member 104 can be adapted to the shapes of the positive electrode connection portion 101 and the negative electrode connection portion 102. For example, the first sealing member 104 is an annular shape. The first sealing member 104 can be a rubber ring.

[0075] In the above technical solution, through the setting of the first sealing member 104, the risk of gas in the positive electrode container 11 and the negative electrode container 12 leaking to the outside of the gas production detection device 1 can be reduced, which is conducive to more accurately collecting the gas produced in the positive electrode container 11 and the negative electrode container 12.

[0076] In some embodiments, the positive electrode container 11 is provided with a positive electrode mounting portion 113 for loading the positive electrode active material; the negative electrode container 12 is provided with a negative electrode mounting portion 123 for loading the negative electrode active material; the positive electrode mounting portion 113, the negative electrode mounting portion 123 and the connection component 10 are disposed at the same height.

[0077] The positive electrode mounting portion 113 for loading the positive electrode active material may include the following situations. As an example, the positive electrode plate including the positive electrode active material is pasted or otherwise loaded on the positive electrode mounting portion 113. As another example, the positive electrode slurry including the positive electrode active material is coated on the positive electrode mounting portion 113.

[0078] The negative electrode mounting portion 123 for loading the negative electrode active material may include the following cases. As an example, the negative electrode plate including the negative electrode active material is pasted or otherwise loaded on the negative electrode mounting portion 123. As another example, the negative electrode paste including the negative electrode active material is coated on the negative electrode mounting portion 123.

[0079] The positive electrode mounting portion 113, the negative electrode mounting portion 123, and the connection component 10 are disposed at the same height. It can also be understood that, along the height direction of the gas generation detection device 1 (e.g., the z direction in the figure), the central positions of the positive electrode mounting portion 113, the negative electrode mounting portion 123, and the connection component 10 are located on the same horizontal line or the same straight line. In this way, the sum of the distance between the positive electrode mounting portion 113 and the connection component 10 and the distance between the connection component 10 and the negative electrode mounting portion 123 is shorter, and the ions have a shorter transmission path, which is beneficial to improving the reaction rate between the positive electrode and the electrolyte and between the negative electrode and the electrolyte, so that an appropriate amount of gas can be collected in a shorter time.

[0080] In the above technical solution, the positive electrode mounting portion 113 is used to load the positive electrode active material, and the negative electrode mounting portion 123 is used to load the negative electrode active material. In this way, it is convenient for the generation of gas in the positive electrode container 11 and the negative electrode container 12; the positive electrode mounting portion 113, the negative electrode mounting portion 123, and the connection component 10 are disposed at the same height, which is beneficial to reducing the length of the transmission path of ions between the positive electrode container 11 and the negative electrode container 12, is beneficial to improving the efficiency of gas generation, and further is beneficial to improving the efficiency of the gas generation detection device 1 for collecting the generated gas.

[0081] Figure 3 It is a schematic diagram of another perspective of the gas generation detection device according to an embodiment of the present application. In some embodiments, as shown in Figures 1 to 3 shown, the gas generation detection device 1 further includes a positive electrode guide post 110 and a negative electrode guide post 120; the positive electrode container 11 includes a positive electrode sealing cover 111 and a positive electrode housing 112. The positive electrode sealing cover 111 covers the positive electrode housing 112 to form the positive electrode container 11. The positive electrode sealing cover 111 is provided with a positive electrode guide post opening 1110 for the positive electrode guide post 110 to pass through; the negative electrode container 12 includes a negative electrode sealing cover 121 and a negative electrode housing 122. The negative electrode sealing cover 121 covers the negative electrode housing 122 to form the negative electrode container 12. The negative electrode sealing cover 121 is provided with a negative electrode guide post opening 1210 for the negative electrode guide post 120 to pass through.

[0082] The positive electrode guide post 110 and the negative electrode guide post 120 are conductors, and the materials of the two can be conductive materials. The positive electrode guide post 110 and the negative electrode guide post 120 are used to connect with the battery testing device, so as to facilitate controlling the reaction between the positive electrode and the electrolyte and the reaction between the negative electrode and the electrolyte through the battery testing device. As an example, when the battery testing device is connected to the positive electrode guide post 110 and the negative electrode guide post 120, the positive electrode active material in the positive electrode container 11 can reversibly release active ions (such as lithium ions), and the negative electrode active material in the negative electrode container 12 can reversibly embed active ions (such as lithium ions). At the same time, there are also reactions between the positive electrode active material and the electrolyte and reactions such as the SEI film and the electrolyte, and then gas is generated in the positive electrode container 11 and the negative electrode container 12.

[0083] The positive electrode guide post 110 and the negative electrode guide post 120 can be columnar or plate-shaped structures, and the embodiments of the present application include but are not limited to this.

[0084] The positive electrode sealing cover 111 and the negative electrode sealing cover 121 can be made of insulating materials, such as rubber.

[0085] The shapes of the positive electrode sealing cover 111 and the negative electrode sealing cover 121 can be circular or square, and the embodiments of the present application include but are not limited to this.

[0086] The materials of the positive electrode housing 112 and the negative electrode housing 122 can be metal materials, for example, aluminum or steel.

[0087] The positive electrode housing 112 and the negative electrode housing 122 can be structures with an opening on one side, and the positive electrode sealing cover 111 and the negative electrode sealing cover 121 respectively seal the openings to form the positive electrode container 11 and the negative electrode container 12.

[0088] As an example, the positive electrode housing 112 includes a first wall 1121, a second wall 1122 and a third wall 1123. The second wall 1122 is connected to the first wall 1121 and the third wall 1123. The third wall 1123 includes a first sub-wall 11231, a second sub-wall 11232, a third sub-wall 11233, a first connecting sub-wall 11234 and a second connecting sub-wall 11235. The first sub-wall 11231, the second sub-wall 11232 and the third sub-wall 11233 extend along the height direction of the gas production detection device 1. The first connecting sub-wall 11234 and the second connecting sub-wall 11235 are parallel to the second wall 1122, and the first connecting sub-wall 11234 connects the first sub-wall 11231 and the third sub-wall 11233, and the second connecting sub-wall 11235 connects the second sub-wall 11232 and the third sub-wall 11233. Among them, the first connecting sub-wall 11234, the third sub-wall 11233 and the second connecting sub-wall 11235 enclose to form a positive electrode connection part 101, and the third sub-wall 11233 can be provided with holes for fluid to pass through.

[0089] The negative electrode housing 122 may have the same structure as the positive electrode housing 112. The negative electrode housing 122 includes a fourth wall 1221, a fifth wall 1222, and a sixth wall 1223. The fifth wall 1222 is connected to the fourth wall 1221 and the sixth wall 1223. The sixth wall 1223 includes a fourth sub-wall 12231, a fifth sub-wall 12232, a sixth sub-wall 12233, a fourth connecting sub-wall 12234, and a fifth connecting sub-wall 12235. The fourth sub-wall 12231, the fifth sub-wall 12232, and the sixth sub-wall 12233 extend along the height direction of the gas generation detection device 1. The fourth connecting sub-wall 12234 and the fifth connecting sub-wall 12235 are parallel to the fifth wall 1222. The fourth connecting sub-wall 12234 connects the fourth sub-wall 12231 and the sixth sub-wall 12233, and the fifth connecting sub-wall 12235 connects the fifth sub-wall 12232 and the sixth sub-wall 12233. Among them, the fourth connecting sub-wall 12234, the fifth connecting sub-wall 12235, and the sixth sub-wall 12233 may enclose to form a negative electrode connection portion 102, and the sixth sub-wall 12233 may be provided with holes for fluid passage.

[0090] The shapes of the positive electrode guide post opening 1110 and the negative electrode guide post opening 1210 may be circular, square, or other irregular shapes. The embodiments of the present application include but are not limited to this.

[0091] As an example, the positive electrode guide post 110 and the positive electrode guide post opening 1110 are in interference fit or transition fit, and the negative electrode guide post 120 and the negative electrode guide post opening 1210 are in interference fit or transition fit, so that the positive electrode guide post 110 can be more firmly fixed to the positive electrode sealing cover 111, and the negative electrode guide post 120 can be more firmly fixed to the negative electrode sealing cover 121.

[0092] In the technical solution of this embodiment, the positive electrode guide post 110 and the negative electrode guide post 120 are used to connect with the battery testing device, so as to facilitate controlling the gas generation in the positive electrode container 11 and the negative electrode container 12 through the battery testing device. The positive electrode sealing cover 111 is provided with a positive electrode guide post opening 1110 for the positive electrode guide post 110 to pass through, and the negative electrode sealing cover 121 is provided with a negative electrode guide post opening 1210 for the negative electrode guide post 120 to pass through, so that it is convenient to fix the positive electrode guide post 110 on the positive electrode sealing end cover and fix the negative electrode guide post 120 on the negative electrode sealing end cover.

[0093] Figure 4 It is a schematic diagram of the positive electrode guide post of an embodiment of the present application. In some embodiments, in combination with Figures 1 to 4As shown in the figure, the positive electrode guide post 110 includes a positive electrode protruding portion 1101 and a positive electrode extending portion 1102. The positive electrode protruding portion 1101 protrudes from the positive electrode sealing cover 111, and the positive electrode extending portion 1102 extends into the positive electrode container 11. A positive electrode mounting portion 113 is provided on the positive electrode extending portion 1102. The negative electrode guide post 120 includes a negative electrode protruding portion 1201 and a negative electrode extending portion 1202. The negative electrode protruding portion 1201 protrudes from the negative electrode sealing cover 121, and the negative electrode extending portion 1202 extends into the negative electrode container 12. A negative electrode mounting portion 123 is provided on the negative electrode extending portion 1202.

[0094] The positive electrode protruding portion 1101 protrudes from the positive electrode sealing cover 111. It can be understood that the positive electrode protruding portion 1101 is located outside the positive electrode container 11. The negative electrode protruding portion 1201 protrudes from the negative electrode sealing cover. It can be understood that the negative electrode protruding portion 1201 is located outside the negative electrode container 12.

[0095] In the above technical solution, the positive electrode protruding portion 1101 and the negative electrode protruding portion 1201 are used to connect with the battery testing device. The positive electrode extending portion 1102 extends into the positive electrode container 11 and is provided with a positive electrode mounting portion 113, so as to facilitate placing the positive electrode active material in the positive electrode container 11 and facilitating the generation of gas in the positive electrode container 11. The negative electrode extending portion 1202 extends into the negative electrode container 12 and is provided with a negative electrode mounting portion 123, so as to facilitate placing the negative electrode active material in the negative electrode container 12 and facilitating the generation of gas in the negative electrode container 12.

[0096] In some embodiments, the positive electrode mounting portion 113 is a first groove 11021 provided on the positive electrode extending portion 1102, and the negative electrode mounting portion 123 is a second groove 12021 provided on the negative electrode extending portion 1202.

[0097] The sizes of the first groove 11021 and the second groove 12021 can be limited according to the sizes of the positive electrode plate and the negative electrode plate.

[0098] During the use of the gas generation detection device 1, the positive electrode mounting portion 113 and the negative electrode mounting portion 123 are immersed in the electrolyte.

[0099] As an example, the first groove 11021 and the second groove 12021 have the same structure and size.

[0100] Through the settings of the first groove 11021 and the second groove 12021, it is convenient to load the positive electrode active material more firmly on the positive electrode extending portion 1102 and the negative electrode active material more firmly on the negative electrode extending portion 1202, so as to more accurately simulate the gas generation situation in the battery, which is beneficial to more accurately collect the gas generated in the positive electrode container 11 and the negative electrode container 12.

[0101] In some embodiments, the material of the positive terminal post 110 includes aluminum, and the material of the negative terminal post 120 includes copper.

[0102] As an example, the material of the positive terminal post 110 is aluminum, and the material of the negative terminal post 120 is copper.

[0103] As another example, the material of the positive terminal post 110 is aluminum alloy, and the material of the negative terminal post 120 is copper alloy.

[0104] In the above technical solutions, it is beneficial to reduce the risk of reaction between the positive terminal post 110 and the positive electrode plate and the risk of reaction between the negative terminal post 120 and the negative electrode plate, which is beneficial to more accurately simulate the gas generation situation in the battery and is beneficial to more accurately collect the gas generated in the positive container 11 and the negative container 12.

[0105] In some embodiments, the gas generation detection device 1 further includes a second sealing member 15. A second sealing member 15 is provided between the positive electrode housing 112 and the positive electrode sealing cover 111, and / or a second sealing member 15 is provided between the negative electrode housing 122 and the negative electrode sealing cover 121.

[0106] As an example, the second sealing member 15 can be provided only between the positive electrode housing 112 and the positive electrode sealing cover 111, or can be provided only between the negative electrode housing 122 and the negative electrode sealing cover 121. As another example, a second sealing member 15 is provided between the positive electrode housing 112 and the positive electrode sealing cover 111, and a second sealing member 15 is provided between the negative electrode housing 122 and the negative electrode sealing cover 121.

[0107] The shape of the second sealing member 15 is adapted to the shapes of the positive electrode sealing cover 111 and the negative electrode sealing cover 121. For example, the second sealing member 15 is an annular shape.

[0108] The material of the second sealing member 15 can be an insulating material, such as rubber.

[0109] By providing the second sealing member 15, the risk of gas leakage from the positive container 11 and the negative container 12 to the outside of the gas generation detection device 1 can be reduced, which is beneficial to more accurately collect the gas generated in the positive container 11 and the negative container 12.

[0110] In some embodiments, the positive electrode housing 112 is provided with a first air inlet 161, and the positive electrode sealing cover 111 is provided with a first air outlet 162; the negative electrode housing 122 is provided with a second air inlet 171, and the negative electrode sealing cover 121 is provided with a second air outlet 172.

[0111] The first air inlet 161 can be provided on the first wall 1121 of the positive electrode housing 112, and the second air inlet 171 can be provided on the fourth wall 1221 of the negative electrode housing 122.

[0112] Before collecting and detecting the generated gas using the gas generation detection device 1, inert gas (such as nitrogen) can be introduced into the positive electrode container 11 and the negative electrode container 12 through the first air inlet 161 and the second air inlet 171 respectively to evacuate the gas in the positive electrode container 11 and the negative electrode container 12. Specifically, open the first air inlet 161, the second air inlet 171, the first air outlet 162, and the second air outlet 172, and introduce nitrogen into the positive electrode container 11 and the negative electrode container 12 through the first air inlet 161 and the second air inlet 171 for 1 - 10 minutes. After evacuating the gas in the positive electrode container 11 and the negative electrode container 12, close and seal the first air inlet 161, the second air inlet 171, the first air outlet 162, and the second air outlet 172.

[0113] In the above technical solution, through the settings of the first air inlet 161 and the second air inlet 171, it is convenient to introduce inert gas into the positive electrode container 11 and the negative electrode container 12 through the first air inlet 161 and the second air inlet 171 respectively before collecting the generated gas using the gas generation detection device 1, and then evacuate the residual gas in the positive electrode container 11 and the negative electrode container 12 through the first air outlet 162 and the second air outlet 172, which is convenient for more accurate analysis of the gas generated in the positive electrode container 11 and the negative electrode container 12; in addition, the gas generated by the reaction with the electrolyte in the positive electrode container 11 and the negative electrode container 12 can also be collected through the first air outlet 162 and the second air outlet 172.

[0114] In some embodiments, along the height direction of the gas generation detection device 1, the first air inlet 161 is arranged at one end of the positive electrode housing 112 close to the positive electrode sealing cover 111, and the second air inlet 171 is arranged at one end of the negative electrode housing 122 close to the negative electrode sealing cover 121.

[0115] In the above technical solution, after injecting the electrolyte into the positive electrode container 11 and the negative electrode container 12, there is still a certain distance between the first air inlet 161 and the second air inlet 171 and the liquid level of the electrolyte, which is convenient for introducing inert gas through the first air inlet 161 and the second air inlet 171.

[0116] In some embodiments, along the height direction of the gas generation detection device 1, the height of the first air inlet 161 is greater than or equal to the height of the electrolyte injected into the positive electrode container 11, and the height of the second air inlet 171 is greater than or equal to the height of the electrolyte injected into the negative electrode container 12.

[0117] As an example, the height of the first air inlet 161 is greater than the height of the electrolyte injected into the positive electrode container 11, and the height of the second air inlet 171 is greater than the height of the electrolyte injected into the negative electrode container 12.

[0118] Through the above settings, the risk that the gases introduced through the first air inlet 161 and the second air inlet 171 are dissolved in the electrolyte can be reduced, which is beneficial to more accurately analyze the gases generated in the positive electrode container 11 and the negative electrode container 12.

[0119] In some embodiments, the gas generation detection device 1 further includes a stirring member 18, and the stirring member 18 is disposed in the positive electrode container 11 and the negative electrode container 12. Stirring by using the stirring member 18 can reduce the solubility of the gas in the electrolyte, thereby facilitating more accurate collection of the generated gas.

[0120] The stirring member 18 can be a stirring rod, a fan-shaped stirring blade, etc., and the embodiments of the present application include but are not limited to this.

[0121] In some embodiments, the stirring member 18 is disposed at the bottom of the positive electrode container 11 and the bottom of the negative electrode container 12. In this way, a better stirring effect can be achieved.

[0122] As an example, the stirring member 18 is fixed to the second wall 1122 of the positive electrode housing 112 and the fifth wall 1222 of the negative electrode housing 122.

[0123] In some embodiments, the rotation speed of the stirring member 18 is 100 r / min to 5000 r / min.

[0124] The rotation speed of the stirring member 18 can be 100 r / min, 100 r / min, 1000 r / min, 2000 r / min, 3000 r / min, 4000 r / min, 5000 r / min or any value within the above range.

[0125] When the rotation speed is greater than or equal to 100 r / min, a better stirring effect can be achieved; when the rotation speed is less than or equal to 5000 r / min, the risk of serious convection caused by too fast rotation speed can be reduced.

[0126] In some embodiments, the rotation speed of the stirring member 18 is 200 r / min to 300 r / min. In this way, a better stirring effect can be achieved while reducing convection.

[0127] In some embodiments, the material of the isolation member 103 includes at least one of a gel polymer, a ceramic, a nanoporous material or an ion sieve molecular membrane, the gel polymer includes polyethylene glycol, the ceramic includes at least one of montmorillonite, zirconia or alumina, the nanoporous material includes molecular sieves, and the ion sieve molecular membrane includes polyethylene oxide containing a lithium salt. The isolation device prepared by using the above materials can play a role in conducting ions, and at the same time can also play a role in blocking the electrolyte and gas.

[0128] [Positive electrode plate]

[0129] The positive electrode mounting portion 113 is used to carry the positive electrode active material. Among them, the positive electrode plate can be fixed on the positive electrode mounting portion 113, or the positive electrode paste including the positive electrode active material can be coated on the positive electrode mounting portion 113.

[0130] The positive electrode plate includes a positive electrode current collector and a positive electrode film layer provided on the positive electrode current collector.

[0131] The positive electrode current collector can be a metal foil or a composite current collector. For example, the positive electrode current collector can be an aluminum foil.

[0132] The composite current collector may include a polymer material base layer and a metal layer formed on at least one surface of the polymer material base layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0133] The positive electrode film layer includes the positive electrode active material, and the positive electrode active material can adopt the positive electrode active material for batteries known in the art. As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate with olivine structure, lithium transition metal oxide, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be abbreviated as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be abbreviated as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be abbreviated as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be abbreviated as NCM622), LiNi 0.8 Co 0.1 Mn 0.1O2 (which can also be abbreviated as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and at least one of its modified compounds. Examples of olivine-structured lithium-containing phosphates can include, but are not limited to, lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and at least one of a composite material of lithium manganese iron phosphate and carbon.

[0134] In some embodiments, the positive electrode active material can also be a sodium salt, for example, a layered sodium transition metal oxide.

[0135] The positive electrode film layer may optionally further include a binder. As an example, the binder can include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), a vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, and a fluorinated acrylate resin.

[0136] The positive electrode film layer may optionally further include a conductive agent. The conductive agent can be selected from at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0137] In some embodiments, the positive electrode plate can be prepared by the following method: dispersing the components for preparing the positive electrode plate, such as the positive electrode active material, the conductive agent, the binder, and any other components, in a solvent (such as N-methylpyrrolidone) to form a positive electrode slurry; coating the positive electrode slurry on the positive electrode current collector, and after processes such as drying, cold pressing, and laser treatment, the positive electrode plate can be obtained.

[0138] [Negative electrode plate]

[0139] The negative electrode mounting portion 123 is used to carry the negative electrode active material. Among them, the negative electrode plate can be fixed on the negative electrode mounting portion 123, or the negative electrode slurry including the negative electrode active material can be coated on the negative electrode mounting portion 123.

[0140] The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer provided on the negative electrode current collector.

[0141] The negative electrode current collector can be a metal foil or a composite current collector. The negative electrode current collector can be a copper foil. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0142] The negative electrode active material layer includes a negative electrode active material. The negative electrode active material can be a negative electrode active material for batteries known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material can be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0143] The negative electrode film layer may also optionally include a binder. The binder can be selected from at least one of styrene-butadiene rubber (SBR), polyacrylic acid (PAA), sodium polyacrylate (PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), polymethacrylic acid (PMAA), and carboxymethyl chitosan (CMCS).

[0144] The negative electrode active material layer may also optionally include a conductive agent. The conductive agent can be selected from at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0145] The negative electrode film layer may also optionally include other additives, such as thickeners (such as sodium carboxymethyl cellulose (CMC-Na)), etc.

[0146] In some embodiments, the negative electrode plate can be prepared in the following manner: Dispersing the components for preparing the negative electrode plate, such as the negative electrode active material, conductive agent, binder, and any other components, in a solvent (such as deionized water) to form a negative electrode slurry; Coating the negative electrode slurry on the negative electrode current collector, and after processes such as drying, cold pressing, and laser treatment, the negative electrode plate can be obtained.

[0147] [Electrolyte]

[0148] The electrolyte plays a role in conducting ions between the positive electrode and the negative electrode. The types of electrolytes in the embodiments of this application are not specifically limited and can be selected according to requirements. The electrolyte includes an electrolyte salt and a solvent.

[0149] The electrolyte salt may include a lithium salt, for example, at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0150] The electrolyte salt may further include a sodium salt, such as sodium hexafluorophosphate. Embodiments of the present application include, but are not limited to, this.

[0151] The solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone.

[0152] An embodiment of the present application provides a gas production detection device 1, which includes a positive electrode container 11, a negative electrode container 12, and a connection component 10. The connection component 10 is used to connect the positive electrode container 11 and the negative electrode container 12. The positive electrode container 11 includes a positive electrode sealing cover 111 and a positive electrode housing 112. The positive electrode sealing cover 111 covers the positive electrode housing 112 to form the positive electrode container 11. The positive electrode sealing cover 111 is provided with a positive electrode guide post opening 1110 through which the positive electrode guide post 110 passes. The positive electrode guide post 110 passes through the positive electrode guide post opening 1110 and is fixed on the positive electrode sealing cover 111. A first groove 11021 for accommodating the positive electrode active material is provided on the part of the positive electrode guide post 110 extending into the positive electrode container 11. The positive electrode housing 112 is provided with a first air inlet 161, and the positive electrode sealing cover 111 is provided with a first air outlet 162. The negative electrode container 12 includes a negative electrode sealing cover 121 and a negative electrode housing 122. The negative electrode sealing cover 121 covers the negative electrode housing 122 to form the negative electrode container 12. The negative electrode sealing cover 121 is provided with a negative electrode guide post opening 1210 through which the negative electrode guide post 120 passes. The negative electrode guide post 120 passes through the negative electrode guide post opening 1210 and is fixed on the negative electrode sealing cover 121. A second groove 12021 for accommodating the negative electrode active material is provided on the part of the negative electrode guide post 120 extending into the negative electrode container 12. The negative electrode housing 122 is provided with a second air inlet 171, and the negative electrode sealing cover 121 is provided with a second air outlet 172. The connection component 10 includes a positive electrode connection part 101, a negative electrode connection part 102, and an isolation component 103. The positive electrode connection part 101 is arranged on the side of the positive electrode container 11 facing the negative electrode container 12, the negative electrode connection part 102 is arranged on the side of the negative electrode container 12 facing the positive electrode container 11, the positive electrode connection part 101 is connected to the negative electrode connection part 102, and the isolation component 103 is arranged between the positive electrode connection part 101 and the negative electrode connection part 102. Among them, the positive electrode connection part 101 and the negative electrode connection part 102 can be cylindrical pipes. The positive electrode container 11 includes a cylindrical structure and a cylindrical pipe protruding from the cylindrical structure and communicating with the cylindrical structure. The negative electrode container 12 includes a cylindrical structure and a cylindrical pipe protruding from the cylindrical structure and communicating with the cylindrical structure. A circular sheet-shaped isolation component 103 is arranged between the cylindrical pipes of the positive electrode container and the cylindrical pipes of the negative electrode container. The material of the isolation component 103 is 5A zeolite molecular sieve, the porosity is 40%, the pore diameter is 0.5 nm, and the lithium ion conductivity is 7×10 -5S / cm. When the gas generation detection device 1 is working, the gas generation detection device 1 is connected to the battery test device. Under the action of the battery test device, lithium ions reciprocally migrate between the positive electrode active material and the negative electrode active material. Lithium ions in the positive electrode active material can pass through the isolation component 103 and migrate in the positive electrode container 11 and the negative electrode container 12. Moreover, the positive electrode active material reacts with the electrolyte to generate gas, and the negative electrode active material reacts with the electrolyte to generate gas. The isolation component 103 can isolate the diffusion of gas between the positive electrode container 11 and the negative electrode container 12, thereby facilitating the more accurate collection of the gas generated in the positive electrode container 11 through the first gas outlet 162 and the collection of the gas generated in the negative electrode container 12 through the second gas outlet 172.

[0153] The electrolyte may also optionally include a negative electrode film-forming additive, a positive electrode film-forming additive, and may also include a performance additive capable of improving certain performance of the battery, such as a performance additive for improving the overcharge performance of the battery, improving the high-temperature or low-temperature performance of the battery, etc.

[0154] It should be noted that this application is not limited to the above embodiments. The above embodiments are only examples. Embodiments having the same structure and the same effect as the technical idea within the technical solution scope of this application are included in the technical scope of this application. In addition, within the scope of not departing from the gist of this application, various deformations that can be thought of by those skilled in the art are imposed on the embodiments, and other ways constructed by combining some constituent elements in the embodiments are also included in the scope of this application.

Claims

1. A gas production detection device, characterized in that, Comprising: A positive electrode container; A negative electrode container; An isolation component configured to isolate the solvent and gas of the electrolytes in the positive electrode container and the negative electrode container, and the isolation component is configured to conduct ions.

2. The gas generation detection device according to claim 1, characterized in that, The material of the isolation component has pores, and the pores are less than or equal to 0.5 nm, and / or, the lithium ion conductivity of the material of the isolation component is 10 -6 S / cm to 10 - 2 S / cm.

3. The gas generation detection device according to claim 1, characterized in that, The lithium ion conductivity of the material of the isolation component is 10 -4 S / cm to 10 -3 S / cm.

4. The gas production detection device according to claim 1, characterized in that, The gas generation detection device is provided with a connection assembly, and the positive electrode container and the negative electrode container are communicated through the connection assembly; The connection assembly includes a positive electrode connection part, a negative electrode connection part and the isolation component. The positive electrode connection part is arranged on one side of the positive electrode container facing the negative electrode container. The negative electrode connection part is arranged on one side of the negative electrode container facing the positive electrode container. The positive electrode connection part is communicated with the negative electrode connection part, and the isolation component is arranged between the positive electrode connection part and the negative electrode connection part.

5. The gas generation detection device according to claim 4, wherein The isolation component is an isolation sheet arranged between the positive electrode connection part and the negative electrode connection part.

6. The gas generation detection device according to claim 4, wherein, The positive electrode connection part and the positive electrode container are of an integral structure, and the negative electrode connection part and the negative electrode container are of an integral structure; or, The positive electrode connection part and the positive electrode container are of a split structure, and the negative electrode connection part and the negative electrode container are of a split structure.

7. The gas generation detection device according to claim 4, wherein The connection assembly further includes a first sealing component, and the first sealing component is arranged between the positive electrode connection part and the isolation component, and / or, the first sealing component is arranged between the negative electrode connection part and the isolation component.

8. The gas production detection device according to claim 4, characterized in that The positive electrode container is provided with a positive electrode mounting part for loading positive electrode active material; The negative electrode container is provided with a negative electrode mounting part for loading negative electrode active material; The positive electrode mounting part, the negative electrode mounting part and the connection assembly are arranged at the same height.

9. The gas production detection device according to claim 8, characterized in that, The gas generation detection device further includes a positive electrode guide post and a negative electrode guide post; The positive electrode container includes a positive electrode sealing cover and a positive electrode housing. The positive electrode sealing cover covers the positive electrode housing to form the positive electrode container. The positive electrode sealing cover is provided with a positive electrode guide post opening for the positive electrode guide post to pass through; The negative electrode container includes a negative electrode sealing cover and a negative electrode housing. The negative electrode sealing cover covers the negative electrode housing to form the negative electrode container. The negative electrode sealing cover is provided with a negative electrode guide post opening for the negative electrode guide post to pass through.

10. The gas production detection device according to claim 9, characterized in that, The positive electrode guide post includes a positive electrode extending part and a positive electrode extending-in part. The positive electrode extending part extends out of the positive electrode sealing cover. The positive electrode extending-in part extends into the positive electrode container. The positive electrode mounting part is arranged on the positive electrode extending-in part; The negative electrode guide post includes a negative electrode extending part and a negative electrode extending-in part. The negative electrode extending part extends out of the negative electrode sealing cover. The negative electrode extending-in part extends into the negative electrode container. The negative electrode mounting part is arranged on the negative electrode extending-in part.

11. The gas production detection device according to claim 10, wherein The positive electrode mounting part is a first groove arranged on the positive electrode extending-in part, and the negative electrode mounting part is a second groove arranged on the negative electrode extending-in part.

12. The gas production detection device according to claim 9, characterized in that, The material of the positive electrode guide post includes aluminum, and the material of the negative electrode guide post includes copper.

13. The gas production detection device according to claim 9, characterized in that, The gas generation detection device further includes a second sealing component, and the second sealing component is arranged between the positive electrode housing and the positive electrode sealing cover, and / or, the second sealing component is arranged between the negative electrode housing and the negative electrode sealing cover.

14. The gas production detection device according to claim 9, wherein The positive electrode housing is provided with a first air inlet, and the positive electrode sealing cover is provided with a first air outlet; The negative electrode housing is provided with a second air inlet, and the negative electrode sealing cover is provided with a second air outlet.

15. The gas production detection device according to claim 14, wherein, Along the height direction of the gas generation detection device, the first air inlet is arranged at one end of the positive electrode housing close to the positive electrode sealing cover, and the second air inlet is arranged at one end of the negative electrode housing close to the negative electrode sealing cover.

16. The gas production detection device according to claim 14, wherein, Along the height direction of the gas generation detection device, the height of the first air inlet is greater than or equal to the height of the electrolyte injected into the positive electrode container, and the height of the second air inlet is greater than or equal to the height of the electrolyte injected into the negative electrode container.

17. The gas production detection device according to claim 1, characterized in that, The gas generation detection device further includes a stirring member, and the stirring member is arranged in the positive electrode container and the negative electrode container.

18. The gas production detection device according to claim 17, characterized in that, The stirring member is arranged at the bottom of the positive electrode container and the bottom of the negative electrode container.

19. The gas production detection device according to claim 17, characterized in that, The rotation speed of the stirring member is 100 r / min to 5000 r / min.

20. The gas production detection device according to claim 19, characterized in that, The rotation speed of the stirring member is 200 r / min to 300 r / min.

21. The gas production detection device according to any one of claims 1-20, characterized in that, The material of the isolation member includes one of gel polymer, ceramic, nanoporous material or ion sieve molecular membrane. The gel polymer includes polyethylene glycol, the ceramic includes one of montmorillonite, zirconia or alumina, the nanoporous material includes molecular sieve, and the ion sieve molecular membrane includes polyethylene oxide containing lithium salt.

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