Control method and control system for gas generation during battery formation, and battery formation system

Abstract

The present application relates to the technical field of batteries, in particular to a control method and a control system for gas generation during battery formation, and a battery formation system. The control method comprises acquiring a first flow rate of a protective gas introduced during a formation process of a battery; on the basis of the first flow rate, providing the protective gas for the battery during the formation process, so as to dilute the concentration of combustible gases generated during the battery formation process to below a standard value. This dilutes gases generated during battery formation processes and reduces the concentration of combustible gases generated during said processes, improving battery reliability and stability at the formation stage.

Description

Battery formation gas production control method, control system and battery formation system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2024102697733, filed on March 8, 2024, entitled “Battery Formation Gas Production Control Method, Control System and Battery Formation System,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a control method and control system for battery formation gas production, and a battery formation system. Background Art

[0004] With the rapid development of society, the demand for green new energy and high-performance energy storage devices is becoming increasingly urgent. Batteries, as a new generation of green energy storage and conversion devices, have been widely used in portable electronic devices and electric vehicles. Batteries generally consist of multiple cells. After assembly, these cells undergo a formation phase to remove undesirable substances, form a solid electrolyte interface (SEI) film, and improve battery life. However, this formation phase also produces gases.

[0005] Summary of the Invention

[0006] In view of this, the main technical problem solved by this application is to provide a control method, control system and formation system for battery formation gas production, which can dilute the concentration of combustible gas generated during the battery formation process and make the concentration of combustible gas below the standard value, thereby reducing the probability of thermal runaway of the combustible gas.

[0007] In order to solve the above technical problems, a technical solution adopted in the present application is to provide a method for controlling gas production during battery formation, comprising: obtaining a first flow rate of protective gas introduced into the battery during the formation process;

[0008] A protective gas is provided to the battery during the formation process based on the first flow rate, so as to dilute the concentration of the combustible gas generated during the battery formation process to below a standard value.

[0009] In the embodiment of the present application, a protective gas is input into the battery during the battery formation process to dilute the gas generated during the battery formation process, and the concentration of the combustible gas generated during the battery formation process is reduced and reduced to below the marked value, so as to reduce or avoid the occurrence of the situation where the concentration of the combustible gas generated by the battery during the formation process reaches the explosion limit, thereby improving the reliability and stability of the battery during the formation stage.

[0010] Among them, the standard value is the value below the lower explosion limit of combustible gas.

[0011] In any embodiment, obtaining a first flow rate of protective gas introduced into the battery during a formation process includes:

[0012] Detect the current concentration and gas production rate of combustible gas generated by the battery during the formation process;

[0013] Obtain the lower limit of the concentration of combustible gas based on the current concentration;

[0014] The flow rate corresponding to the gas production rate and the lower limit of the concentration is obtained as the minimum first flow rate for introducing the protective gas into the battery during the formation process.

[0015] In the embodiment of the present application, by detecting the current concentration of the combustible gas in the battery formation process, specifically, the current concentration of multiple combustible gases can be detected in real time or at a fixed time. When the lower explosion limits of various combustible gases are known, the lower explosion limit value of the mixed combustible gas (the lower concentration limit value of the combustible gas) can be calculated. In the embodiment of the present application, the minimum flow rate of the shielding gas can be calculated by the gas production rate of the combustible gas and the lower concentration limit value of the combustible gas, so as to facilitate the control of the first flow rate of the shielding gas, and facilitate the control probability of improving the reliability and stability in the battery formation process.

[0016] In any embodiment, obtaining the lower limit value of the concentration of the combustible gas based on the current concentration includes:

[0017] Convert the current concentration and production rate of the combustible gas into the current concentration and production rate of the reference gas;

[0018] Obtaining the lower limit value of the combustible gas concentration based on the current concentration of the reference gas;

[0019] Obtaining the lower limit flow rate corresponding to the gas production rate and the lower limit of the concentration as the minimum first flow rate for introducing the protective gas into the battery during the formation process includes:

[0020] The lower limit flow rate corresponding to the gas production rate of the reference gas and the lower limit value of the concentration of the combustible gas is obtained as the minimum first flow rate of the protective gas introduced into the battery during the formation process.

[0021] In an embodiment of the present application, the current concentration of the combustible gas is converted into the current concentration of the reference gas, and the gas production rate of the combustible gas is converted into the pre-production rate of the reference gas. The lower limit value of the concentration of the combustible gas can be calculated through the current concentration of the reference gas, which can reduce the complexity of the calculation, simplify the calculation process, and improve the calculation speed.

[0022] In any embodiment, obtaining a first flow rate of protective gas introduced into the battery during a formation process includes:

[0023] Get the current formation stage of the battery;

[0024] The preset flow rate corresponding to the current formation stage is obtained as the first flow rate of the protective gas introduced into the battery during the formation process.

[0025] In the embodiment of the present application, the battery formation process is divided into different stages, and the first flow rate of the shielding gas in the current formation stage is determined. The amount of shielding gas introduced can be controlled in stages, that is, shielding gas with different flow rates is injected into different formation stages. This can simplify the amount of calculation, simplify the control method, save costs, and achieve the effect of diluting the combustible gas generated in the battery formation process, while improving the reliability and stability of the battery during the formation process.

[0026] In any embodiment, obtaining the current formation stage of the battery includes:

[0027] Collect the current charging current and current cumulative formation time of the battery during the formation process;

[0028] The current formation stage of the battery is determined based on the current cumulative formation time and the current charging current.

[0029] In the embodiment of the present application, different formation stages can be divided according to the current charging current and the current cumulative formation time, that is, the process of generating combustible gas and oxygen during the formation process can be divided into multiple formation stages, so as to determine the first flow rate of the protective gas at the same time according to the current formation stage.

[0030] In any embodiment, determining the current formation stage of the battery based on the current cumulative formation time and the current charging current includes: performing integral calculation based on the current charging current and the current cumulative formation time of the battery during the formation process to obtain the amount of electricity charged into the battery during the formation process;

[0031] Based on the amount of electricity charged into the battery, the formation stage of the battery is determined to be the current formation stage.

[0032] In the embodiment of the present application, the battery formation process can be divided into different stages based on the charge and discharge properties of the battery itself, so that the rate of combustible gas and oxygen generated in the same stage is relatively uniform. By calculating the charged amount by integrating the current charging current and the current cumulative formation time, the formation stage of the battery is determined to be the current formation stage, which can improve the stability and reliability of the battery gas dilution.

[0033] In any embodiment, obtaining the current formation stage of the battery includes: obtaining the current open circuit voltage of the battery during the formation process;

[0034] Based on the current open circuit voltage, the formation stage of the battery is determined to be the current formation stage.

[0035] In the embodiments of the present application, the open circuit voltage method during the battery formation process is used to divide the battery into different stages, so that the rates of combustible gas and oxygen generated in the same stage are more uniform. By taking the current open circuit voltage of the battery during the formation process and determining the battery formation stage as the current formation stage, the stability and reliability of the battery gas dilution can be improved.

[0036] In any embodiment, after providing a protective gas to the battery during the formation process based on the first flow rate, the method further includes:

[0037] Detect the concentration of combustible gas;

[0038] Determine whether the concentration of combustible gas exceeds the preset threshold;

[0039] If so, an alarm signal is issued.

[0040] In the embodiment of the present application, during the battery formation process, by further taking alarm measures, the concentration of the combustible gas is detected in real time or at regular intervals when the protective gas is introduced to determine whether the concentration of the combustible gas exceeds a preset threshold. If it exceeds, it indicates that a dangerous situation exists or is about to exist, and an alarm signal needs to be issued to alert the operator or the system.

[0041] In any embodiment, detecting the concentration of the combustible gas and determining whether the concentration of the combustible gas exceeds a preset threshold; if so, issuing an alarm signal includes:

[0042] Real-time or scheduled detection of combustible gas concentration;

[0043] Determining that the combustible gas concentration is greater than a first preset threshold and less than a second preset threshold, wherein the second preset threshold is greater than the first preset threshold; then issuing a first-level alarm signal;

[0044] Determining that the combustible gas concentration is greater than or equal to a second preset threshold value and less than or equal to a third preset threshold value, wherein the third preset threshold value is greater than the second preset threshold value; issuing a secondary warning signal, and controlling the flow rate of the protective gas to a second flow rate, which is greater than the first flow rate;

[0045] If it is determined that the combustible gas concentration is greater than the third preset threshold, a third-level warning signal is issued and the battery formation power supply is cut off.

[0046] In the embodiment of the present application, the concentration of combustible gas in the battery formation process is divided into three levels, that is, three preset threshold values ​​are set for the concentration of combustible gas, namely the first preset threshold value, the second preset threshold value and the third preset threshold value, and the values ​​of the three increase in sequence. When the combustible gas concentration is greater than the first preset threshold value, it means that there is an imminent danger, and a first-level alarm signal is issued to remind the operator or the system to pay attention. When the combustible gas concentration is greater than the second preset threshold value, it means that the combustible gas concentration is relatively large, and a second-level alarm signal is issued to remind attention, and at the same time, the flow rate of the protective gas is increased to reduce the combustible gas concentration. When the combustible gas concentration is greater than the third preset threshold value, it means that the combustible gas concentration is very large, and the battery formation power supply is cut off to stop the formation reaction and prevent the generation of combustible gas, while continuing to introduce protective gas to dilute the concentration of the combustible gas. By dividing it into three different situations, issuing three different levels of early warning signals, and taking corresponding measures at the same time, the warning effect can be improved and the probability of thermal runaway of the combustible gas in the battery formation process can be reduced.

[0047] In any embodiment, the shielding gas includes air or an inert gas. By introducing the inert gas or air, the combustible gas can be diluted.

[0048] A second aspect of the present application provides a control system for battery formation gas production, the control system including a flow rate detection mechanism, a gas supply mechanism and a negative pressure mechanism, the flow rate detection mechanism being used to determine a first flow rate of protective gas introduced into the battery during the formation process; the gas supply mechanism being connected to the flow rate detection mechanism and being used to input protective gas into the battery during the formation process based on the first flow rate, so as to dilute the concentration of combustible gas generated during the battery formation process to below a standard value; the negative pressure mechanism being used to provide negative pressure for the battery during the formation process.

[0049] The control system in the embodiment of the present application can dilute the concentration of combustible gases generated during the battery formation process by determining a first flow rate of the shielding gas and inputting the shielding gas into the battery during the formation process through the gas supply mechanism, thereby reducing the probability of thermal runaway of the battery during the formation process. The negative pressure mechanism is used to maintain the pressure inside the battery during the formation process within a certain range.

[0050] In any embodiment, the gas supply mechanism includes a shielding gas source and a first pipeline, the first pipeline being connected to the shielding gas source and configured to deliver shielding gas from the shielding gas source to the battery during the formation process. In the embodiment of the present application, the gas supply mechanism delivers shielding gas to the battery through the first pipeline to dilute combustible gases generated during the battery formation process.

[0051] In any embodiment, the negative pressure mechanism includes a vacuum air source and a second pipeline, the second pipeline being connected to the vacuum air source for providing negative pressure to the battery during the formation process. In the embodiment of the present application, the gas in the battery during the formation process is extracted through the second pipeline to stabilize the pressure in the battery.

[0052] In any embodiment, the gas supply mechanism includes a shielding gas proportional valve and a shielding gas flow rate detector disposed on the first pipeline. The shielding gas proportional valve is used to control the flow rate of the shielding gas; the shielding gas flow rate detector is used to detect the flow rate of the shielding gas. In the embodiment of the present application, the gas supply mechanism can control the flow rate of the shielding gas and detect the flow rate of the shielding gas, making the flow rate of the shielding gas easy to control and relatively accurate.

[0053] In any embodiment, the negative pressure mechanism includes a vacuum proportional valve, a combustible gas detector, and an air pressure measuring device provided on the second pipeline. The vacuum proportional valve is used to control the negative pressure, the combustible gas detector is used to monitor the concentration of the combustible gas in the second pipeline, and the air pressure measuring device is used to monitor the negative pressure. In the embodiment of the present application, by providing a vacuum proportional valve and an air pressure measuring device, it is convenient to control the vacuum gas source to extract the gas from the battery during the formation process, and to facilitate the control and detection of the pressure within the battery. By providing a combustible gas detector, the concentration and output rate of the combustible gas can be detected.

[0054] In any embodiment, the gas supply mechanism includes a first bus bar, which is arranged at an end of the first pipeline away from the shielding gas source. In the embodiment of the present application, by providing the first bus bar, multiple batteries in the formation process can be controlled simultaneously, and shielding gas can be uniformly supplied to the multiple batteries.

[0055] In any embodiment, the negative pressure mechanism includes a second bus bar, which is arranged at the end of the second pipeline away from the vacuum air source. In the embodiment of the present application, by providing the second bus bar, the pressure of multiple batteries can be controlled simultaneously, so that the pressure of multiple batteries is relatively uniform.

[0056] In any embodiment, the control system further includes a controller, which is respectively connected to the flow rate detection mechanism, the air supply mechanism, and the negative pressure mechanism, and is configured to obtain first flow rate information transmitted by the flow rate detection mechanism, convert the first flow rate information into first control information and second control information, transmit the first control information to the air supply mechanism to control the air supply mechanism, and transmit the second control information to the negative pressure mechanism to control the negative pressure mechanism. In the embodiments of the present application, by providing a controller to facilitate receiving the first flow rate information and controlling the operation of the air supply mechanism and the negative pressure mechanism, the degree of automation of the control system can be improved.

[0057] The third aspect of the present application provides a battery formation system, including a negative pressure cup and the above-mentioned battery formation gas production control system, the negative pressure cup includes a negative pressure cup body, the negative pressure cup body has a first vent tube and a second vent tube, the first vent tube is used to connect the gas supply mechanism of the control system and the battery; the second vent tube is used to connect the negative pressure mechanism of the control system and the battery. The battery formation system of the embodiment of the present application has the battery control system of the second aspect, and therefore has at least the same advantages of the battery control system of the second aspect. The battery formation system of the embodiment of the present application also has a negative pressure cup, and by providing the negative pressure cup, the battery, the negative pressure mechanism and the gas supply mechanism can be connected and connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] FIG1 is a flow chart of a first embodiment of a method for controlling battery formation gas production according to the present invention;

[0059] FIG2 is a flow chart of a second embodiment of a method for controlling battery formation gas production according to the present application;

[0060] FIG3 is a flow chart of a third embodiment of a method for controlling battery formation gas production according to the present application;

[0061] FIG4 is a flow chart of a fourth embodiment of a method for controlling battery formation gas production according to the present application;

[0062] FIG5 is a flow chart of a fifth embodiment of a method for controlling battery formation gas production according to the present application;

[0063] FIG6 is a flow chart of a sixth embodiment of a method for controlling battery formation gas production according to the present application;

[0064] FIG7 is a flow chart of a seventh embodiment of a method for controlling battery formation gas production according to the present application;

[0065] FIG8 is a flow chart of an eighth embodiment of a method for controlling battery formation gas production according to the present application;

[0066] FIG9a is a structural block diagram of an embodiment of a battery formation gas production control system of the present application;

[0067] FIG9 b is a structural block diagram of another embodiment of the battery formation gas production control system of the present application;

[0068] FIG10 is a schematic structural diagram of an embodiment of a battery formation system of the present application;

[0069] FIG11 is a schematic structural diagram of an embodiment of a negative pressure cup and a battery of the present application;

[0070] FIG12 is a schematic diagram of the exploded structure of an embodiment of the battery of the present application;

[0071] FIG13 is a schematic diagram of the exploded structure of an embodiment of a battery cell of the present application. DETAILED DESCRIPTION

[0072] Below, the embodiments of the battery cells, batteries, and electrical equipment of the present application are described in detail with appropriate reference to the accompanying drawings. However, there may be cases where unnecessary detailed descriptions are omitted. For example, there may be cases where detailed descriptions of well-known matters and repeated descriptions of actually the same structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy 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 described in the claims.

[0073] " range " disclosed in the application is limited in the form of lower limit and upper limit, and given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of special range. The scope limited in this way can be to include end value or not include end value, and can be combined arbitrarily, and promptly any lower limit can form a range with any upper limit combination. For example, if the scope of 60-120 and 80-110 is listed for specific parameter, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range value 1 and 2 listed, and if the maximum range value 3,4 and 5 are listed, then the following range can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In this application, unless otherwise specified, numerical range " ab " represents the abbreviation of any real number combination between a and b, wherein a and b are all real numbers. For example, a numerical range of "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0074] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0075] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0076] Unless otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, a method includes steps (a) and (b), which indicates that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, a method may further include step (c), which indicates that step (c) may be added to the method in any order, for example, the method may include steps (a), (b), and (c), or may include steps (a), (c), and (b), or may include steps (c), (a), and (b), etc.

[0077] Unless otherwise specified, the terms "include" and "comprising" used in this application may be open-ended or closed-ended. For example, "include" and "comprising" may indicate that other components not listed may also be included or that only the listed components are included.

[0078] Unless otherwise specified, the term "or" is used in this application to be inclusive. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, the condition "A or B" is satisfied if any of the following conditions are met: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0079] Battery cells or batteries will produce a certain amount of gas during the formation process. Most lithium-ion batteries will produce combustible gases such as hydrogen, carbon monoxide, and hydrocarbons during the formation process. Hydrocarbons include one or more of methane, ethane, and ethylene. Some lithium-ion batteries produce oxygen and combustible gases at the same time during some stages of formation. During these stages, the mixture of combustible gas and oxygen will form an explosive gas environment inside the battery or exhaust device, which is prone to combustion and explosion when encountering an effective ignition source. In related technologies, batteries or battery cells produce gas during formation. Generally, after the formation is completed, the gas generated during the formation process is extracted to reduce the pressure in the battery or battery cell. During the formation process, the combustible gas and oxygen are dynamically changing. There is a possibility that the combustible gas will reach the explosion limit during the formation process, and there is a corresponding possibility of thermal runaway.

[0080] To this end, an embodiment of the present application provides a method for controlling gas production during battery formation. In an embodiment of the present application, by delivering protective gas to the battery during the formation process and controlling the flow rate of the protective gas, the concentration of the combustible gas in the mixed gas in the battery is reduced to below the standard value, which can achieve the effect of diluting the concentration of the combustible gas in the mixed gas and reduce the probability of thermal runaway. The embodiment of the present application can be used to dilute the concentration of combustible gas in the battery formation process, and can also be used to dilute the concentration of other non-combustible gases in the battery formation. In other embodiments, it can also be used to dilute combustible gas or non-combustible gas after the battery formation is completed.

[0081] To this end, a first embodiment of the first aspect of the present application provides a method for controlling gas production during battery formation, as shown in FIG1 , comprising:

[0082] S110: Obtaining a first flow rate of the protective gas introduced into the battery during the formation process.

[0083] In some embodiments of this application, the battery can be a lithium iron phosphate-graphite battery or a nickel-cobalt-manganese ternary material-graphite battery. During the battery formation process, combustible gases and oxygen are generated. This application does not limit the specific type of battery.

[0084] In some embodiments of the present application, the first flow rate of the protective gas required to be introduced during the battery formation process can be obtained in real time, periodically, or in stages, so that the protective gas is introduced at the first flow rate to reduce the concentration of combustible gas in the battery during the formation process.

[0085] S120: Providing protective gas to the battery during the formation process based on the first flow rate, so as to dilute the concentration of combustible gas generated during the battery formation process to below a standard value.

[0086] In some embodiments of the present application, a protective gas such as an inert gas or air may be introduced into the liquid injection port of the battery to dilute the concentration of the combustible gas generated during the battery formation process.

[0087] In the embodiment of the present application, a protective gas is input into the battery during the battery formation process to dilute the gas generated during the battery formation process, and the concentration of the combustible gas generated during the battery formation process is reduced and reduced to below the marked value, so as to reduce or avoid the occurrence of a situation where the concentration of the combustible gas generated by the battery during the formation process reaches the explosion limit, reduce or avoid the situation where the battery, control system, and formation device experience thermal runaway during the battery formation process, and improve the reliability and stability of the battery during the formation stage.

[0088] The standard value is a value below the lower explosion limit of the combustible gas. For example, in one embodiment of the present application, the standard value is 25% of the lower explosion limit of the combustible gas. In some embodiments of the present application, the standard value may also be a value below 25% of the lower explosion limit of the combustible gas. Specifically, the standard value may be 20%, 18%, 15%, 10% or 5% of the lower explosion limit of the combustible gas.

[0089] In a second embodiment of the present application, a method for controlling battery formation gas production, as shown in FIG2 , includes:

[0090] S210: Detecting the current concentration and gas generation rate of the combustible gas generated during the battery formation process.

[0091] In some embodiments of the present application, the current concentration of the combustible gas generated during the battery formation process can be detected in real time by a combustible gas detector. For example, the gas production rate is different for different combustible gases. In the embodiment of the present application, the current concentrations of different combustible gases are M1, M2, M3...M mBy detecting the corresponding concentrations of combustible gas at two time points, the ratio of the difference in the concentrations of the combustible gas at the two time points to the time period formed by the two time points is the combustible gas production rate. If shielding gas is introduced during the process, the combustible gas production rate is the ratio of the difference in the concentrations of the combustible gas at the two time points to the time period formed by the two time points, and the sum of this ratio and the shielding gas rate.

[0092] S211: Obtain the lower limit value of the concentration of the combustible gas based on the current concentration.

[0093] In some embodiments of the present application, when the current concentrations corresponding to different gases are detected, and the lower explosion limits of the various combustible gases are known, the lower explosion limit of the mixed combustible gas can be calculated. This lower explosion limit is the lower concentration limit of the combustible gas. Specifically, the lower explosion limit is as follows: Formula (1).

[0094] Among them, L m Indicates the lower explosion limit of combustible gas, Y1 indicates the volume percentage of the first combustible gas in the mixed combustible gas. Y2 indicates the volume percentage of the second combustible gas in the mixed combustible gas, Y m Indicates the volume percentage of the mth combustible gas in the mixed combustible gas. The mixed combustible gas is the total volume of all combustible gases generated during the battery formation process. L1 represents the lower explosion limit of the first combustible gas. L2 represents the lower explosion limit of the second combustible gas. L m Indicates the lower explosion limit of the mth combustible gas. In the embodiment of the present application, the mixed combustible gas refers to all the combustible gases in the mixed gas. In the embodiment of the present application, Y1 can be the ratio of the concentration of the first combustible gas to the sum of the concentrations of all combustible gases, that is, Y1 = M1 / (M1+M2+…+M m Y2 can be the ratio of the concentration of the second combustible gas to the sum of the concentrations of all combustible gases, that is, Y1 = M1 / (M1+M2+…+M m ). Ym can be the ratio of the concentration of the second combustible gas to the sum of the concentrations of all combustible gases, that is, Y m =M m / (M1+M2+……+M m ).

[0095] That is, the lower explosion limit of a combustible gas is the reciprocal of the sum of the ratios of the volume percentages of various combustible gases in the mixed combustible gas to the lower explosion limit of the combustible gas.

[0096] For ease of understanding, the present application provides the following specific circumstances. For example, the mixed gas produced during the battery formation process is oxygen, carbon dioxide, carbon monoxide, hydrogen, methane, ethane and ethylene. Among them, carbon monoxide, hydrogen, methane, ethane and ethylene are combustible gases, and oxygen and carbon dioxide are non-combustible gases. The lower explosion limit of methane is 6%, the lower explosion limit of ethane is 3%, the lower explosion limit of ethylene is 2.7%, the lower explosion limit of hydrogen is 4%, and the lower explosion limit of carbon monoxide is 12.5%. In one embodiment of the present application, the volume of methane accounts for 7.62% of the combustible gas content, the volume of ethane accounts for 9.33% of the combustible gas content, the volume of ethylene accounts for 4.8% of the combustible gas content, the volume of hydrogen accounts for 14.77% of the combustible gas content, and the volume of carbon monoxide accounts for 62.52% of the combustible gas content.

[0097] but,

[0098] That is, in this embodiment, the lower explosion limit of the combustible gas is 6.7%.

[0099] S212: Obtaining a lower limit flow rate corresponding to the gas production rate and the lower limit value of the concentration as a minimum first flow rate for introducing the protective gas into the battery during the formation process.

[0100] In some embodiments of the present application, the standard value is 25% of the lower explosion limit of the combustible gas.

[0101] In some embodiments of the present application, the protective gas introduced is, for example, an inert gas, such as nitrogen, argon, etc.

[0102] Wherein, V represents the lower limit flow rate of inert gas as protective gas; L m Indicates the lower explosion limit of the combustible gas, X1 indicates the gas production rate of the first combustible gas. X2 indicates the gas production rate of the second combustible gas, X m Indicates the gas production rate of the mth combustible gas.

[0103] In the embodiment of the present application, the fixed coefficient can be obtained by multiplying the product of the sum of the gas production rates of the various combustible gases and the lower limit of the concentration of the combustible gas (lower explosion limit). The fixed coefficient in the embodiment of the present application is 25%. In the embodiment of the present application, the lower limit flow rate for introducing the shielding gas can be calculated by the gas production rate and the lower limit of the concentration. The lower limit flow rate is the minimum first flow rate for introducing the shielding gas.

[0104] In a specific embodiment of the present application, the gas production rate of methane is 0.16 ml / min, the gas production rate of ethane is 0.02 ml / min, the gas production rate of ethylene is 0.1 ml / min, the gas production rate of hydrogen is 0.32 ml / min, and the gas production rate of carbon monoxide is 1.34 ml / min. The lower limit flow rate of the protective gas is:

[0105] That is, in a specific embodiment of the present application, the first flow rate is greater than or equal to 0.52 mL / min.

[0106] S220: Providing protective gas to the battery during the formation process based on the first flow rate, so as to dilute the concentration of combustible gas generated during the battery formation process to below a standard value.

[0107] In a specific embodiment of the present application, the introduction of a protective gas can dilute the gas generated by the battery formation. Specifically, the first flow rate can be any value greater than or equal to 0.52 mL / min. That is, an inert gas such as nitrogen can be introduced at a flow rate greater than or equal to 0.52 mL / min to dilute the concentration of the combustible gas generated by the battery formation to below the standard value, thereby reducing the probability of thermal runaway.

[0108] In the embodiment of the present application, by detecting the current concentration of the combustible gas in the battery formation process, specifically, the current concentration of multiple combustible gases can be detected in real time or at a fixed time. When the lower explosion limits of various combustible gases are known, the lower explosion limit value of the mixed combustible gas (the lower concentration limit value of the combustible gas) can be calculated. In the embodiment of the present application, the lower flow rate of the protective gas can be calculated by the gas production rate of the combustible gas and the lower concentration limit value of the combustible gas, so as to facilitate controlling the first flow rate of the protective gas, and facilitate improving the control probability of reliability and stability in the battery formation process.

[0109] In a third embodiment of the present application, a method for controlling gas production during battery formation is provided, as shown in FIG3 , including:

[0110] S310: Detecting the current concentration and gas generation rate of combustible gas generated during the battery formation process.

[0111] In some embodiments of the present application, the current concentration of the combustible gas generated during the battery formation process can be detected in real time by a combustible gas detector. For example, the gas production rate is different for different combustible gases. In the embodiment of the present application, the current concentrations of different combustible gases are M1, M2, M3...M mBy detecting the corresponding concentrations of combustible gas at two time points, the ratio of the difference in the concentrations of the combustible gas at the two time points to the time period formed by the two time points is the combustible gas production rate. If shielding gas is introduced during the process, the combustible gas production rate is the ratio of the difference in the concentrations of the combustible gas at the two time points to the time period formed by the two time points, and the sum of this ratio and the shielding gas rate.

[0112] In some embodiments, the combustible gas generated during the battery formation process may include hydrogen, methane, ethane, and ethylene. This application does not limit the composition of the combustible gas generated during the battery formation process.

[0113] S320: Convert the current concentration and gas production rate of the combustible gas to the current concentration and gas production rate of the reference gas.

[0114] In some embodiments of the present application, a linear relationship is established between the lower limit value calculated from the current concentration of the combustible gas and the lower limit value calculated from the current concentration of the gas before reference, so that the current concentration of the combustible gas can be converted to the current concentration of the reference gas by adjusting the linear coefficient. For example, the current concentration of the combustible gas can be converted to the current concentration of hydrogen by multiplying the linear coefficient. The gas production rate of the combustible gas is then converted to the gas production rate of the reference gas.

[0115] S330: Obtaining a lower limit value of the concentration of the combustible gas based on the current concentration of the reference gas.

[0116] In the embodiments of the present application, the lower limit of the combustible gas concentration is the lower limit of the reference gas concentration, that is, the ratio of the current concentration of the reference gas to the lower explosion limit of the reference gas. In the embodiments of the present application, the ratio of the current concentration of hydrogen to the lower explosion limit of hydrogen is the lower limit of the combustible gas concentration. This reduces the amount of data collected, simplifies the calculation, and reduces the amount of computation.

[0117] S340: Obtaining a lower limit flow rate corresponding to the gas production rate of the reference gas and the lower limit value of the concentration of the combustible gas as a minimum first flow rate for introducing the protective gas into the battery during the formation process.

[0118] In the embodiment of the present application, based on the gas production rate of the converted reference gas and the lower limit of the concentration of the reference gas, the lower limit of the concentration of the shielding gas can be calculated, thereby determining the minimum first flow rate of the shielding gas. The embodiment of the present application can reduce the amount of calculation. For example, the lower limit flow rate of the inert shielding gas is the product of the gas production rate converted to hydrogen and its lower explosion limit (lower limit of concentration) divided by a fixed value of 25%, and the lower limit flow rate can be obtained. This flow rate is the minimum first flow rate of the inert shielding gas.

[0119] S350: Providing protective gas to the battery during the formation process based on the first flow rate to dilute the concentration of combustible gas generated during the battery formation process to below a standard value.

[0120] The same as the first embodiment, the details will not be elaborated again.

[0121] In the embodiment of the present application, the current concentration of the combustible gas is converted into the current concentration of the reference gas, and the gas production rate of the combustible gas is converted into the gas production rate of the reference gas. The lower limit value of the concentration of the combustible gas can be calculated through the current concentration of the reference gas, which can reduce the complexity of the calculation, simplify the calculation process, and improve the calculation speed.

[0122] In a fourth embodiment, a method for controlling battery formation gas generation, as shown in FIG4 , includes:

[0123] S410: Obtain the current formation stage of the battery.

[0124] In the embodiment of the present application, the formation stage is the interval during the formation process. For example, the entire battery formation process, from the beginning to the end, is divided into multiple stages, for example, from the beginning to the end, it includes the first stage, the second stage, the third stage ... the Nth stage.

[0125] In one embodiment of the present application, the battery formation process can be divided into multiple different stages. The battery formation process can be divided into different stages based on the rate of generating combustible gas. The battery formation process can also be divided into different stages based on the formation time.

[0126] In one embodiment of the present application, when different stages are divided according to the formation time, the current formation stage can be determined according to the formation time.

[0127] S420: Acquire a preset flow rate corresponding to the current formation stage as a first flow rate of the protective gas introduced into the battery during the formation process.

[0128] In some embodiments of the present application, the flow rates of different protective gases introduced into the corresponding stages are pre-set according to the battery characteristics, and the first flow rate of the protective gas introduced into the current formation stage can be obtained by querying the flow rate of the protective gas corresponding to the pre-set stage corresponding to the current formation stage. In an embodiment of the present application, by pre-setting the flow rates of the protective gas introduced into the corresponding stages, the embodiment of the present application only needs to obtain the current formation stage, and the first flow rate of the protective gas introduced into the current formation stage can be determined by searching and matching, which can greatly reduce the amount of calculation.

[0129] In the embodiment of the present application, the flow rates of different protective gases corresponding to different stages are pre-set according to the battery characteristics. For example, the flow rates of the first protective gas corresponding to different formation stages are pre-set according to the materials of the positive and negative electrode plates of the battery, such as lithium iron phosphate-graphite battery, or nickel cobalt manganese ternary material-graphite battery.

[0130] In some embodiments of the present application, the flow rates of different protective gases corresponding to different stages are pre-set, which can be obtained in advance through pre-testing or training. For example, it includes: S421: obtaining multiple sample formation stages of the sample battery. S422: determining the lower limit value of the combustible gas generated by the battery formation in the sample stage, and collecting the gas production rate of the combustible gas in the sample stage. S423: based on the lower limit value and the gas production rate, determining the preset flow rate of the protective gas in the sample stage, and constructing a correspondence between the preset battery formation stage and the flow rate of the protective gas. In the embodiment of the present application, by pre-setting the corresponding relationship between the corresponding battery formation stage and the flow rate of the protective gas, it is convenient to determine the first flow rate in the battery formation process.

[0131] S430: Providing protective gas to the battery during the formation process based on the first flow rate, so as to dilute the concentration of combustible gas generated during the battery formation process to below a standard value.

[0132] The same as the first embodiment, no further details will be given here.

[0133] In the embodiment of the present application, the battery formation process is divided into different stages, and the first flow rate of the shielding gas in the current formation stage is determined. The amount of shielding gas introduced can be controlled in stages, that is, shielding gas with different flow rates is injected into different formation stages. This can simplify the amount of calculation, simplify the control method, save costs, and achieve the effect of diluting the combustible gas generated in the battery formation process, while improving the reliability and stability of the battery during the formation process.

[0134] In a fifth embodiment of the present application, a method for controlling battery formation gas generation, as shown in FIG5 , includes:

[0135] S510: Collecting the current charging current and the current cumulative formation time of the battery during the formation process.

[0136] In some specific embodiments of the present application, for example, lithium iron phosphate-graphite batteries, during the formation process, it is generally possible to use a 0.03C current charge, a charging time of 20 minutes, a standing time of 10 minutes, and then a 0.1C current charge, with a charging cut-off voltage of 3.2V. The charging current of the battery formation process is pre-set, and the current charging time of the formation can be collected, and the corresponding current charging current is obtained based on the charging time. The charging time is the cumulative formation time. In other embodiments, it is also possible to collect the current cumulative formation time and directly collect the charging current during the battery formation process. For example, in the embodiment of the present application, the current charging current can be 0.03C, and the current formation cumulative time is 5 minutes; or the current charging current is 0.03C, and the current formation cumulative time is 10 minutes; or the current charging current is 0.03C, and the current formation cumulative time is 20 minutes; or the current charging current is 0, and the current formation cumulative time is 25 minutes; or the current charging current is 0.1C, and the current formation cumulative time is 35 minutes, etc. This application only takes lithium iron phosphate-graphite battery as an example, but it is not limited to the positive and negative electrode materials of the battery.

[0137] S520: Determine a current formation stage of the battery based on the current cumulative formation time and the current charging current.

[0138] In some embodiments of the present application, the amount of gas generated during the battery formation process will be different at different stages, such as the amount of combustible gas generated and the amount of oxygen generated will be different at different stages. In some implementations of the present application, the battery formation process is divided into multiple stages. In the present application embodiment, the current formation stage of the battery can be determined by referring to the current formation cumulative duration and the current charging current. For example, it can be determined that the current charging current is 0.03C, and the current formation cumulative duration is 10min for the current formation stage of a lithium iron phosphate-graphite battery as the second stage.

[0139] In some embodiments of the present application, determining the current formation stage of the battery based on the current cumulative formation time and the current charging current may also include: S521: performing an integral calculation based on the current charging current of the battery during the formation process and the current cumulative formation time to obtain the amount of electricity charged into the battery during the battery formation process; S522: determining that the formation stage of the battery is the current formation stage based on the amount of electricity charged into the battery.

[0140] In the embodiment of the present application, the battery formation process can be divided into different stages based on the charge and discharge properties of the battery itself, so that the rate of combustible gas and oxygen generated in the same stage is relatively uniform. By calculating the charged amount by integrating the current charging current and the current cumulative formation time, the formation stage of the battery is determined to be the current formation stage, which can improve the stability and reliability of the battery gas dilution.

[0141] S530: Acquire a preset flow rate corresponding to the current formation stage as a first flow rate of the protective gas introduced into the battery during the formation process.

[0142] In some embodiments of the present application, the flow rates of different protective gases introduced into the corresponding stages are pre-set according to the battery characteristics, and the first flow rate of the protective gas introduced into the current formation stage can be obtained by querying the flow rate of the protective gas corresponding to the pre-set stage corresponding to the current formation stage. In an embodiment of the present application, by pre-setting the flow rates of the protective gas introduced into the corresponding stages, the embodiment of the present application only needs to obtain the current formation stage, and the first flow rate of the protective gas introduced into the current formation stage can be determined by searching and matching, which can greatly reduce the amount of calculation.

[0143] In the embodiment of the present application, the flow rates of different protective gases corresponding to different stages are pre-set according to the battery characteristics. For example, the flow rates of the first protective gas corresponding to different formation stages are pre-set according to the materials of the positive and negative electrode plates of the battery, such as lithium iron phosphate-graphite battery, or nickel cobalt manganese ternary material-graphite battery.

[0144] In some embodiments of the present application, the flow rates of different protective gases corresponding to different stages are pre-set, which can be obtained in advance through pre-testing or training. For example, it includes: S521: obtaining multiple sample formation stages of the sample battery. S522: determining the lower limit value of the combustible gas generated by the battery formation in the sample stage, and collecting the gas production rate of the combustible gas in the sample stage. S523: based on the lower limit value and the gas production rate, determining the preset flow rate of the protective gas in the sample stage, and constructing a correspondence between the preset battery formation stage and the flow rate of the protective gas. In the embodiment of the present application, by pre-setting the corresponding relationship between the corresponding battery formation stage and the flow rate of the protective gas, it is convenient to determine the first flow rate in the battery formation process.

[0145] In a specific embodiment of the present application, for lithium iron phosphate-graphite batteries, the flow rate of the protective gas nitrogen in the first stage is preset to 0, the flow rate of the nitrogen in the second stage is 319.28 mL / min, the flow rate of the nitrogen in the third stage is 185.66 mL / min, and the flow rate of the nitrogen in the fourth stage is 353.63 mL / min. In the embodiment of the present application, the current formation stage is the second stage, and the flow rate of the preset protective gas in the second stage can be obtained as 319.28 mL / min. Then, the first flow rate of the protective gas introduced into the current formation stage is 319.28 mL / min.

[0146] S540: Providing a protective gas to the battery during the formation process based on the first flow rate, so as to dilute the concentration of the combustible gas generated during the battery formation process to below a standard value.

[0147] In one embodiment of the present application, a protective gas is injected into the battery housing through the liquid injection port of the battery cell, and the flow rate of the protective gas is controlled to be a first flow rate. For example, the injection of nitrogen can be controlled, and the first flow rate is controlled to be 319.28 mL / min. In one embodiment of the present application, a protective gas is input into the battery during the battery formation process to dilute the gas generated during the battery formation process, and the concentration of the combustible gas generated during the battery formation process is reduced and reduced to below the marked value, so as to reduce or avoid the occurrence of a situation where the concentration of the combustible gas generated by the battery during the formation process reaches the explosion limit, thereby improving the reliability and stability of the battery during the formation stage.

[0148] In a sixth embodiment of the present application, a method for controlling battery formation gas production, as shown in FIG6 , includes:

[0149] S610: Obtain the current open circuit voltage of the battery during the formation process.

[0150] In some embodiments of the present application, the open circuit voltage during the battery formation process can be tested by a detection method, and this voltage is the current open circuit voltage.

[0151] S620: Determine, based on the current open circuit voltage, that the formation stage of the battery is the current formation stage.

[0152] In the embodiment of the present application, the current state of charge during the battery formation process can be obtained through the current open circuit voltage. According to the correspondence between the preset state of charge and the formation stage of the battery, the current formation stage corresponding to the current open circuit voltage can be determined.

[0153] S630: Acquire a preset flow rate corresponding to the current formation stage as a first flow rate of the protective gas introduced into the battery during the formation process.

[0154] In one embodiment of the present application, the first stage is pre-set to be before 113.4% SOC (state of charge), and nitrogen may not be injected, or nitrogen may be injected at a lower rate, such as the flow rate of nitrogen injected into each battery is 50ml / min; the second stage is the 113.4%-125.5% SOC stage, and the flow rate of nitrogen injected into each battery is 350ml / min; the third stage is the 125.5%-128.5% SOC stage, and the flow rate of nitrogen injected into each battery is 2000ml / min; the fourth stage is the 0-21% SOC stage, and the flow rate of nitrogen injected into each battery is 100ml / min. In the embodiment of the present application, for example, the current formation stage is the second stage, and the first flow rate of nitrogen injected into the battery is 350ml / min.

[0155] S640: Providing a protective gas to the battery during the formation process based on the first flow rate, so as to dilute the concentration of the combustible gas generated during the battery formation process to below a standard value.

[0156] The same as the first embodiment, no further details will be given here.

[0157] In the embodiments of the present application, the open circuit voltage method during the battery formation process is used to divide the battery into different stages, so that the rates of combustible gas and oxygen generated in the same stage are more uniform. By taking the current open circuit voltage of the battery during the formation process and determining the battery formation stage as the current formation stage, the stability and reliability of the battery gas dilution can be improved.

[0158] In the seventh embodiment of the present application, a method for controlling battery formation gas production, as shown in FIG7 , includes:

[0159] S710: Obtain a first flow rate of the protective gas introduced into the battery during the formation process.

[0160] The same as the first embodiment, no further details will be given here.

[0161] S720: Providing protective gas to the battery during the formation process based on the first flow rate, so as to dilute the concentration of combustible gas generated during the battery formation process to below a standard value.

[0162] The same as the first embodiment, no further details will be given here.

[0163] S730: Detects the concentration of combustible gas.

[0164] In the embodiment of the present application, by detecting the concentration of the combustible gas in the battery in real time or at regular intervals, or detecting the concentration of the combustible gas in the battery formation pipeline, it is possible to further monitor the concentration of the combustible gas during the battery formation process. In one embodiment of the present application, the concentration of the reference gas can be detected in real time or at regular intervals, such as the concentration of hydrogen in real time or at regular intervals. In other embodiments, the concentration of other combustible gases can also be detected in real time or at regular intervals. In the embodiment of the present application, the concentration of the combustible gas is the volume fraction of the combustible gas.

[0165] S740: Determine whether the concentration of combustible gas exceeds a preset threshold.

[0166] The preset threshold value of this application is a pre-set value. For example, the preset threshold value of hydrogen is a hydrogen gas integral fraction of 4‰, which is used to determine whether the concentration of hydrogen exceeds 4‰.

[0167] If yes, S750: issue an alarm signal.

[0168] In the embodiments of the present application, if the preset threshold is exceeded, it indicates that a dangerous situation exists or is about to exist, and an alarm signal needs to be issued to alert the operator or system. If the preset threshold is not exceeded, it indicates that the concentration of combustible gas diluted during the battery formation process in the embodiments of the present application is low, achieving the corresponding effect. In the embodiments of the present application, the alarm signal can be a voice reminder, a light reminder, etc.

[0169] In the embodiment of the present application, during the battery formation process, by further taking alarm measures, the concentration of the combustible gas is detected in real time or at regular intervals when the protective gas is introduced to determine whether the concentration of the combustible gas exceeds a preset threshold. If it exceeds, it indicates that a dangerous situation exists or is about to exist, and an alarm signal needs to be issued to alert the operator or system, thereby improving the protection effect.

[0170] In an eighth embodiment of the present application, a method for controlling battery formation gas production, as shown in FIG8 , includes:

[0171] S810: Obtain a first flow rate of the protective gas introduced into the battery during the formation process.

[0172] The same as the first embodiment, no further details will be given here.

[0173] S820: Providing a protective gas to the battery during the formation process based on the first flow rate, so as to dilute the concentration of the combustible gas generated during the battery formation process to below a standard value.

[0174] The same as the first embodiment, no further details will be given here.

[0175] S830: Real-time or scheduled detection of combustible gas concentration.

[0176] The same as the seventh embodiment, no further details will be given here.

[0177] S841: Determine that the combustible gas concentration is greater than a first preset threshold and less than a second preset threshold, wherein the second preset threshold is less than the first preset threshold; then issue a first-level alarm signal.

[0178] In a specific embodiment of the present application, the first preset threshold and the second preset threshold are pre-set values, the first preset threshold is 4‰, and the second preset threshold is 6‰. In the embodiment of the present application, the concentration of hydrogen is X, and when 4‰ < X < 6‰, a level 1 alarm signal is issued, indicating a low level of alarm, to alert the operator or system.

[0179] S842: Determine that the combustible gas concentration is greater than or equal to the second preset threshold and less than or equal to the third preset threshold, wherein the third preset threshold is greater than the second preset threshold; then issue a secondary warning signal, and control the introduction of protective gas to a second flow rate, which is greater than the first flow rate.

[0180] In a specific embodiment of the present application, the second preset threshold is 6‰, and the third preset threshold is 1%. In the embodiment of the present application, the concentration of hydrogen is X. When 6‰≤X≤1%, a secondary alarm signal is issued, and the protective gas flow regulating valve is controlled in conjunction to increase the flow rate of the protective gas. Specifically, in the embodiment of the present application, the flow rate of the protective gas can be increased by 30%, so that the second flow rate is equal to 1.3 times the first flow rate, so as to increase the effect of diluting the concentration of the combustible gas and reduce the concentration of the combustible gas. The above is only an example, and other values ​​can be used in other embodiments.

[0181] S843: If it is determined that the combustible gas concentration is greater than the third preset threshold, a third-level warning signal is issued and the battery formation power supply is cut off.

[0182] In a specific embodiment of the present application, when the concentration of combustible gas is greater than the third preset threshold value and the concentration of hydrogen is greater than 1%, a third-level warning signal is issued, which is the highest warning signal. At the same time, the battery formation power supply is cut off to prevent battery formation and prevent the continued generation of combustible gas from the source. At the same time, protective gas continues to be introduced to dilute the concentration of combustible gas.

[0183] In the embodiment of the present application, the concentration of combustible gas in the battery formation process is divided into three levels, that is, three preset threshold values ​​are set for the concentration of combustible gas, namely the first preset threshold value, the second preset threshold value and the third preset threshold value, and the values ​​of the three increase in sequence. When the combustible gas concentration is greater than the first preset threshold value, it means that there is an imminent danger, and a first-level alarm signal is issued to remind the operator or the system to pay attention. When the combustible gas concentration is greater than the second preset threshold value, it means that the combustible gas concentration is relatively large, and a second-level alarm signal is issued to remind attention, and at the same time, the flow rate of the protective gas is increased to reduce the combustible gas concentration. When the combustible gas concentration is greater than the third preset threshold value, it means that the combustible gas concentration is very large, and the battery formation power supply is cut off to stop the formation reaction and prevent the generation of combustible gas, while continuing to introduce protective gas to dilute the concentration of the combustible gas. By dividing it into three different situations, issuing three different levels of early warning signals, and taking corresponding measures at the same time, the warning effect can be improved and the probability of thermal runaway of the combustible gas in the battery formation process can be reduced.

[0184] In a second aspect of the present application, a control system for battery formation gas production is provided, as shown in Figures 9a and 10. The control system includes a flow rate detection mechanism 200, a gas supply mechanism 300 and a negative pressure mechanism 400. The flow rate detection mechanism 200 is used to determine a first flow rate of protective gas introduced into the battery 100 during the formation process; the gas supply mechanism 300 is connected to the flow rate detection mechanism 200, and is used to input protective gas to the battery 100 during the formation process based on the first flow rate, so as to dilute the concentration of combustible gas generated during the battery formation process to below the standard value; the negative pressure mechanism 400 is used to provide negative pressure for the battery 100 during the formation process.

[0185] The control system in the embodiment of the present application can dilute the concentration of combustible gas generated during the formation process of the battery 100 by determining a first flow rate of the protective gas and inputting the protective gas into the battery 100 during the formation process through the gas supply mechanism 300, thereby reducing the probability of thermal runaway of the battery 100 during the formation process. The negative pressure mechanism 400 is used to maintain the pressure inside the battery 100 during the formation process within a certain range.

[0186] In some embodiments, the gas supply mechanism 300 includes a protective gas source 310 and a first pipeline 320, wherein the first pipeline 320 is connected to the protective gas source 310 and is used to pass the protective gas from the protective gas source 310 into the battery 100 during the formation process. In the embodiment of the present application, the gas supply mechanism 300 inputs protective gas to the battery 100 through the first pipeline 320 to achieve the effect of diluting the combustible gas generated by the formation of the battery 100. In the embodiment of the present application, the protective gas source 310 can be nitrogen. In other embodiments, the protective gas source 310 can be argon or air.

[0187] In some embodiments, the negative pressure mechanism 400 includes a vacuum air source 410 and a second pipe 420, wherein the second pipe 420 is connected to the vacuum air source 410 and is used to provide negative pressure to the battery 100 during the formation process. In the embodiment of the present application, the gas in the battery 100 during the formation process is extracted through the second pipe 420 to stabilize the pressure inside the battery 100.

[0188] In some embodiments, the gas supply mechanism 300 includes a shielding gas proportional valve 330 and a shielding gas flow detector 340 provided on the first pipeline 320. The shielding gas proportional valve 330 is used to regulate the flow rate of the shielding gas; the shielding gas flow detector 340 is used to detect the flow rate of the shielding gas. In the embodiment of the present application, the gas supply mechanism 300 can regulate the flow rate of the shielding gas and detect the flow rate of the shielding gas, so that the flow rate of the shielding gas is easy to control and relatively accurate. In the embodiment of the present application, the shielding gas flow detector 340 can be a nitrogen flow detector, which is provided between the shielding gas proportional valve 330 and the battery 100. In the embodiment of the present application, the shielding gas proportional valve 330 can be one or more of an air-controlled pressure reducing valve, an electric proportional valve, and an electromagnetic valve.

[0189] In some embodiments, the negative pressure mechanism 400 includes a vacuum proportional valve 430, a combustible gas detector 440 and an air pressure measuring device 450 provided on the second pipeline 420. The vacuum proportional valve 430 is used to regulate the negative pressure, the combustible gas detector 440 is used to monitor the concentration of the combustible gas in the second pipeline 420, and the air pressure measuring device 450 is used to monitor the negative pressure. In the embodiment of the present application, by providing the vacuum proportional valve 430 and the air pressure measuring device 450, it is convenient to regulate the vacuum gas source 410 to extract the gas from the battery 100 during the formation process, and to facilitate the regulation and detection of the pressure inside the battery 100. By providing the combustible gas detector 440, the concentration and output rate of the combustible gas can be detected. In the embodiment of the present application, the combustible gas detector 440 can be a hydrogen detection sensor. In other embodiments, the combustible gas detector 440 can also include detection sensors for other combustible gases.

[0190] In some embodiments, the negative pressure mechanism 400 further includes a gas-liquid separator (not shown), which is disposed on the second pipeline 420 and located between the vacuum air source 410 and the battery 100. The gas-liquid separator is used to separate the gas and liquid when extracting the gas during the formation process. This reduces the impact of the liquid reaching the vacuum air source 410 on the equipment.

[0191] In some embodiments, the gas supply mechanism 300 includes a first bus 350, which is disposed at an end of the first pipeline 320 away from the shielding gas source 410. In the embodiments of the present application, by providing the first bus 350, multiple batteries 100 in the formation process can be controlled simultaneously, and a uniform shielding gas flow can be provided to the multiple batteries 100.

[0192] In some embodiments, the negative pressure mechanism 400 includes a second bus bar 460, which is disposed at an end of the second pipe 420 away from the vacuum air source 410. In the embodiment of the present application, by providing the second bus bar 460, the pressure of multiple batteries 100 can be controlled simultaneously, so that the pressure of the multiple batteries 100 is relatively uniform.

[0193] In some embodiments, as shown in FIG9b , the control system further includes a controller 700, which is connected to the flow rate detection mechanism 200, the air supply mechanism 300, and the negative pressure mechanism 400, respectively. The controller 700 is configured to obtain first flow rate information transmitted by the flow rate detection mechanism 200, convert the first flow rate information into first control information and second control information, and transmit the first control information to the air supply mechanism 300 to control the air supply mechanism 300; and transmit the second control information to the negative pressure mechanism 400 to control the negative pressure mechanism 400. In the embodiments of the present application, the provision of the controller 700 facilitates receiving the first flow rate information and controlling the operation of the air supply mechanism 300 and the negative pressure mechanism 400. This can improve the automation level of the control system.

[0194] A third aspect of the present application provides a battery formation system, as shown in Figures 10 and 11, comprising a negative pressure cup 500 and the aforementioned battery 100 formation gas production control system. The negative pressure cup 500 comprises a negative pressure cup body 510, which has a first vent tube 511 and a second vent tube 512. The first vent tube 511 is used to connect the gas supply mechanism 300 of the control system to the battery 100; the second vent tube 512 is used to connect the negative pressure mechanism 400 of the control system to the battery 100. The battery 100 formation system of the embodiment of the present application has the battery 100 control system of the second aspect, and thus has at least the same advantages as the battery 100 control system of the second aspect. The battery 100 formation system of the embodiment of the present application further comprises a negative pressure cup 500. By providing the negative pressure cup 500, the battery 100, the negative pressure mechanism 400, and the gas supply mechanism 300 can be connected. In the embodiment of the present application, the negative pressure cup 500 and the battery 100 are connected via a negative pressure nozzle 600.

[0195] For ease of understanding, Figure 12 is a schematic diagram of the exploded structure of the battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, and the battery cell 20 is accommodated in the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0196] In the battery 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 20. The battery cells 20 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which may then be connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing 10.

[0197] The battery cell 20 may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0198] Please refer to Figure 13, which shows an exploded schematic diagram of a battery cell 20 provided in some embodiments of the present application. The X, Y, and Z coordinates in the figure represent coordinates in three mutually perpendicular directions in three-dimensional space. A battery cell 20 is the smallest unit that makes up a battery 100. As shown in Figure 3, a battery cell 20 includes an end cap 21, a housing 22, a cell assembly 23, and other functional components.

[0199] The end cap 21 is a component that fits over the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the end cap 21 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the end cap 21 from deforming when subjected to compression or collision, thereby enhancing the structural strength and safety of the battery cell 20. The end cap 21 can be provided with functional components such as electrode terminals 21a. The electrode terminals 21a can be used to electrically connect to the battery cell assembly 23 to transmit or receive electrical energy from the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of this application are not particularly limited in this regard. In some embodiments, an insulating member may be provided inside the end cap 21 to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating member may be made of plastic, rubber, or the like.

[0200] The housing 22 is a component that cooperates with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the battery cell assembly 23, electrolyte, and other components. The housing 22 and end cap 21 can be separate components. An opening can be provided in the housing 22, and the end cap 21 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and housing 22 can be integrated. Specifically, the end cap 21 and housing 22 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 22 needs to be enclosed, the end cap 21 is placed over the housing 22. The housing 22 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. Specifically, the shape of the housing 22 can be determined based on the specific shape and size of the battery cell assembly 23. The housing 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of this application do not impose any specific restrictions on this. In the embodiment of the present application, the liquid injection port (not shown) is provided on the housing 22 or the end cover 21 .

[0201] The cell assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more cell assemblies 23 may be contained in the shell 22. The cell assembly 23 is mainly formed by winding or stacking the positive electrode sheets and the negative electrode sheets, and a separator is usually provided between the positive electrode sheets and the negative electrode sheets. The parts of the positive electrode sheets and the negative electrode sheets with active materials constitute the main body of the cell assembly, and the parts of the positive electrode sheets and the negative electrode sheets without active materials each constitute a tab 23a. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 23a connects the electrode terminals to form a current loop.

[0202] [Positive electrode]

[0203] In some embodiments, the positive electrode sheet includes a positive electrode current collector and a positive electrode film layer disposed on at least one surface of the positive electrode current collector.

[0204] As an example, the positive electrode current collector has two surfaces opposite to each other in its thickness direction, and the positive electrode film layer is disposed on either or both of the two opposite surfaces of the positive electrode current collector.

[0205] In some embodiments, the positive electrode current collector may be a metal foil or a composite current collector. For example, aluminum foil may be used as the metal foil. The composite current collector may include a polymer material base and a metal layer formed on at least one surface of the polymer material base. The composite current collector may be formed by forming a metal material (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.).

[0206] In some embodiments, the positive electrode film layer includes a positive electrode active material. When the secondary battery is a lithium ion battery, the positive electrode active material may be a positive electrode active material for lithium ion batteries that is well known in the art. As an example, the positive electrode active material may include at least one of the following materials: lithium phosphates containing olivine structure, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may 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 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiN i0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and its modified compounds. Examples of olivine-structured lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to 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 iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0207] In some embodiments, the positive electrode film layer may further optionally include a binder. The binder may 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 fluorine-containing acrylate resin.

[0208] In some embodiments, the positive electrode film layer may further include a conductive agent. For example, the conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0209] In some embodiments, the positive electrode sheet can be prepared by the following method: the components for preparing the positive electrode sheet, such as the positive electrode active material, the conductive agent, the second binder and any other components, are dispersed in a solvent (such as N-methylpyrrolidone) to form a positive electrode slurry; the positive electrode slurry is coated on the positive electrode current collector, and after drying, cold pressing and other processes, the positive electrode sheet can be obtained.

[0210] [Negative electrode]

[0211] The negative electrode sheet includes a negative electrode current collector and a negative electrode film layer provided on at least one surface of the negative electrode current collector, wherein the negative electrode film layer includes a negative electrode active material.

[0212] As an example, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode film layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0213] In some embodiments, the negative electrode current collector may be a metal foil or a composite current collector. For example, copper foil may be used as the metal foil. The composite current collector may include a polymer base layer and a metal layer formed on at least one surface of the polymer base material. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer base material (such as a base material of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0214] In some embodiments, the negative electrode active material may be a negative electrode active material for a battery that is well known in the art. As an example, the negative electrode active material may 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. The silicon-based material may be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0215] In some embodiments, the negative electrode film layer may further include a binder. The binder may 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).

[0216] In some embodiments, the negative electrode film layer may further include a conductive agent, which may be selected from at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0217] In some embodiments, the negative electrode film layer may optionally include other additives, such as a thickener (eg, sodium carboxymethyl cellulose (CMC-Na)).

[0218] In some embodiments, the negative electrode sheet can be prepared by the following method: the components for preparing the negative electrode sheet, such as the negative electrode active material, the conductive agent, the binder and any other components, are dispersed in a solvent (such as deionized water) to form a negative electrode slurry; the negative electrode slurry is coated on the negative electrode current collector, and after drying, cold pressing and other processes, the negative electrode sheet can be obtained.

[0219] [Isolation film]

[0220] The present application has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0221] In some embodiments, the material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation.

[0222] [Electrolytes]

[0223] The electrolyte conducts ions between the positive and negative electrodes. This application does not specify the type of electrolyte, and the electrolyte can be selected based on the needs. For example, the electrolyte can be liquid, gel, or solid.

[0224] In some embodiments, the electrolyte is an electrolyte solution, which includes an electrolyte salt and a solvent.

[0225] In some embodiments, the electrolyte salt may be selected from 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 difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0226] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl 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, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone.

[0227] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain battery properties, such as additives that improve battery overcharge performance, and additives that improve battery high or low temperature performance.

[0228] In some embodiments, the positive electrode sheet, the negative electrode sheet, and the separator can be made into a battery cell assembly through a winding process or a lamination process.

[0229] In some embodiments, the housing may be a hard shell, such as a hard plastic shell, an aluminum shell, a steel shell, or the like.

[0230] The present application has no particular limitation on the shape of the battery cell, which may be cylindrical, square, or any other shape.

[0231] The above are merely embodiments of the present application and do not limit the patent scope of the present application. The above embodiments can be combined. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for controlling gas production during battery formation, wherein: include: Obtaining a first flow rate of protective gas introduced into the battery during the formation process; The protective gas is provided to the battery during the formation process based on the first flow rate, so as to dilute the concentration of the combustible gas generated during the battery formation process to below a standard value.

2. The method for controlling battery formation gas generation according to claim 1, wherein: The step of obtaining a first flow rate of protective gas introduced into the battery during the formation process comprises: detecting a current concentration and a gas generation rate of combustible gas generated during a formation process of the battery; Obtaining a lower limit value of the concentration of the combustible gas based on the current concentration; The lower limit flow rate corresponding to the gas production rate and the lower limit value of the concentration is obtained as the minimum first flow rate for introducing the protective gas into the battery during the formation process.

3. The method for controlling battery formation gas generation according to claim 2, wherein: The obtaining of the lower limit value of the concentration of the combustible gas based on the current concentration includes: converting the current concentration and gas production rate of the combustible gas into the current concentration and gas production rate of the reference gas; Obtaining a lower limit value of the concentration of the combustible gas based on the current concentration of the reference gas; The step of obtaining a lower flow rate corresponding to the gas production rate and the lower limit of the concentration as a minimum first flow rate for introducing the protective gas into the battery during the formation process includes: A lower limit flow rate corresponding to the gas production rate of the reference gas and the lower limit value of the concentration of the combustible gas is obtained as a minimum first flow rate for introducing the protective gas into the battery during the formation process.

4. The method for controlling battery formation gas generation according to claim 1, wherein: The step of obtaining a first flow rate of protective gas introduced into the battery during the formation process comprises: Obtaining a current formation stage of the battery; The preset flow rate corresponding to the current formation stage is obtained as a first flow rate of the protective gas introduced into the battery during the formation process.

5. The method for controlling battery formation gas generation according to claim 4, wherein: The obtaining of the current formation stage of the battery includes: Collecting the current charging current and the current cumulative formation time of the battery during the formation process; A current formation stage of the battery is determined based on the current accumulated formation time and the current charging current.

6. The method for controlling battery formation gas generation according to claim 5, wherein: The determining the current formation stage of the battery based on the current cumulative formation time and the current charging current includes: The amount of electricity charged into the battery during the formation process is obtained by performing integral calculation based on the current charging current and the current cumulative formation time of the battery during the formation process; Based on the amount of electricity charged into the battery, the formation stage of the battery is determined to be the current formation stage.

7. The method for controlling battery formation gas generation according to claim 4, wherein: The obtaining of the current formation stage of the battery comprises: Get the current open circuit voltage of the battery during the formation process; Based on the current open circuit voltage, the formation stage of the battery is determined to be the current formation stage.

8. The method for controlling battery formation gas generation according to any one of claims 1 to 7, wherein: After providing the protective gas to the battery during the formation process based on the first flow rate, the method further includes: Detect the concentration of combustible gas; Determining whether the concentration of the combustible gas exceeds a preset threshold; If so, an alarm signal is issued.

9. The method for controlling battery formation gas generation according to claim 8, wherein: The detection of the concentration of the combustible gas determines whether the concentration of the combustible gas exceeds a preset threshold; If so, an alarm signal is issued, including: Real-time or scheduled detection of combustible gas concentration; Determine that the combustible gas concentration is greater than a first preset threshold and less than a second preset threshold, wherein the second preset threshold is greater than the First preset threshold; a first level alarm signal is issued; Determining that the combustible gas concentration is greater than or equal to a second preset threshold and less than or equal to a third preset threshold, wherein the third preset threshold is greater than the second preset threshold; issuing a secondary warning signal, and controlling the flow rate of the protective gas to a second flow rate, wherein the second flow rate is greater than the first flow rate; If it is determined that the combustible gas concentration is greater than the third preset threshold, a third-level warning signal is issued and the battery formation power supply is cut off.

10. The method for controlling battery formation gas generation according to any one of claims 1 to 7 or 9, wherein: The protective gas includes air or an inert gas.

11. A battery formation gas production control system, wherein: The control system includes: A flow rate detection mechanism, used to determine a first flow rate of protective gas introduced into the battery during the formation process; a gas supply mechanism connected to the flow rate detection mechanism, and configured to input protective gas to the battery during the formation process based on the first flow rate, so as to dilute the concentration of combustible gas generated during the battery formation process to below a standard value; The negative pressure mechanism is used to provide negative pressure for the battery during the formation process.

12. The battery formation gas generation control system according to claim 11, wherein: The gas supply mechanism includes a protective gas source and a first pipeline, wherein the first pipeline is connected to the protective gas source and is used to pass the protective gas from the protective gas source into the battery in the formation process; and / or, The negative pressure mechanism includes a vacuum air source and a second pipeline, wherein the second pipeline is connected to the vacuum air source and is used to provide negative pressure for the battery during the formation process.

13. The battery formation gas generation control system according to claim 12, wherein: The gas supply mechanism includes a shielding gas proportional valve and a shielding gas flow detector provided on the first pipeline, wherein the shielding gas proportional valve is used to regulate the flow rate of the shielding gas; the shielding gas flow detector is used to detect the flow rate of the shielding gas; and / or; The negative pressure mechanism includes a vacuum proportional valve, a combustible gas detector and an air pressure measuring device arranged on the second pipeline. The vacuum proportional valve is used to regulate the negative pressure, the combustible gas detector is used to monitor the concentration of the combustible gas in the second pipeline, and the air pressure measuring device is used to monitor the negative pressure.

14. The battery formation gas generation control system according to claim 12 or 13, wherein: The gas supply mechanism includes a first bus, which is arranged at an end of the first pipeline away from the protective gas source; and / or The negative pressure mechanism includes a second bus bar, which is arranged at an end of the second pipeline away from the vacuum air source.

15. The battery formation gas production control system according to any one of claims 11 to 13, wherein: include: A controller is respectively connected to the flow rate detection mechanism, the air supply mechanism and the negative pressure mechanism, and is used to obtain the first flow rate information transmitted by the flow rate detection mechanism, and convert the first flow rate information into first control information and second control information, and transmit the first control information to the air supply mechanism to control the air supply mechanism; and transmit the second control information to the negative pressure mechanism to control the negative pressure mechanism.

16. A battery formation system, wherein: The invention comprises a negative pressure cup and a battery formation gas production control system as described in any one of claims 11 to 15, wherein the negative pressure cup comprises a negative pressure cup body, and the negative pressure cup body has a first vent tube and a second vent tube, wherein the first vent tube is used to connect the air supply mechanism of the control system and the battery; and the second vent tube is used to connect the negative pressure mechanism of the control system and the battery.

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