A high-pressure liquid injection control method, device, medium and product for a large-capacity battery

Abstract

The application discloses a high-pressure liquid injection control method, equipment, medium and product of a large-capacity battery. The method comprises the following steps: obtaining the model of a liquid injection device, determining a first deformation threshold, a second deformation threshold and a pressure interval according to the model of the liquid injection device; when the pressure of the environment where the liquid injection device is located is in the pressure interval, obtaining the deformation amount of the liquid injection device during the liquid injection process; when the deformation amount is greater than the first deformation threshold, controlling to stop actively changing the pressure difference between the inside of the liquid injection device and the liquid injection equipment; after controlling to stop actively changing the pressure difference between the inside of the liquid injection device and the liquid injection equipment, when the deformation amount is less than the second deformation threshold or a preset time length is reached, controlling to actively change the pressure difference between the inside of the liquid injection device and the liquid injection equipment; and determining the preset time length comprises the following steps: determining the pressure change rate of the environment where the liquid injection device is located, and determining the preset time length according to the pressure change rate.

Description

Technical Field

[0001] The embodiments of the present invention relate to automatic control technology, and more particularly to a high-pressure liquid injection control method, device, medium and product for large-capacity batteries. Background Technology

[0002] Lithium-ion power batteries consist of positive and negative electrodes, electrolyte, and an aluminum casing. Common electrolyte filling equipment falls into two categories: isobaric filling and differential pressure filling. Isobaric filling is further divided into confinement-type and bell-type isobaric filling, with the bell-type currently being more widely used in the industry. During the filling process, the electrolyte is quantitatively delivered from a storage tank to the filling cup, which then circulates the electrolyte into the battery cell using a positive and negative pressure circulation method.

[0003] The common electrolyte injection pressure for square batteries is 0.2–0.6 MPa. The level of electrolyte injection is approaching the bottleneck value. With the increasing market demand for capacity, the cell size and the amount of electrolyte are increasing, which leads to an increase in the overall difficulty and time of electrolyte injection. At the same time, in order to improve the specific energy of the cell, the positive and negative electrode materials of the cell are developing towards smaller particles, larger specific surface area, thicker electrodes and higher compaction. The time of electrolyte injection and the degree of electrode wetting are gradually becoming the bottleneck points of cell manufacturing.

[0004] Currently, industry understanding of accelerated liquid injection largely focuses on increasing pressure, typically to 1.5 MPa. However, increasing pressure is challenging, and maintaining and releasing pressure are difficult. In particular, there is no clear method for controlling pressure during high-pressure liquid injection. Most methods involve a direct connection between the gas tank and the cavity, causing a sudden change in internal pressure. This results in instantaneous pressure imbalances between the inside and outside of the battery cell, leading to irreversible deformation. In severe cases, this can cause metal fatigue at the welded joints of the battery cell cover, resulting in cracks and liquid leakage. The equipment cannot achieve the effect of maintaining constant pressure and preventing shell deformation. Summary of the Invention

[0005] This invention provides a high-pressure liquid injection control method, device, medium, and product for large-capacity batteries, so as to effectively control the deformation of the battery (cell) during the liquid injection process.

[0006] In a first aspect, embodiments of the present invention provide a high-pressure liquid injection control method, comprising:

[0007] Obtain the model number of the device to be injected, and determine the first deformation threshold, the second deformation threshold, and the pressure range based on the model number of the device to be injected.

[0008] When the pressure of the environment where the device to be injected is located is within the pressure range, the deformation of the device to be injected during the injection process is obtained.

[0009] when the deformation variable is greater than a first deformation threshold, controlling to stop actively changing the pressure difference between the inside of the liquid injection device and the liquid injection equipment;

[0010] when the deformation variable is less than a second deformation threshold, or a preset time length is reached, after the controlling to stop actively changing the pressure difference between the inside of the liquid injection device and the liquid injection equipment, controlling to actively change the pressure difference between the inside of the liquid injection device and the liquid injection equipment;

[0011] determining the preset time length comprises: determining a pressure change rate of an environment in which the liquid injection device is located, and determining the preset time length according to the pressure change rate.

[0012] Optionally, when the deformation variable is greater than the first deformation threshold, a first valve control instruction is generated.

[0013] when the deformation variable is less than the second deformation threshold, a second valve control instruction is generated.

[0014] the first valve control instruction is used to control an air inlet valve to be closed, and the second valve control instruction is used to control the air inlet valve to be opened.

[0015] Optionally, the deformation variable is a thickness change variable of the liquid injection device.

[0016] Optionally, the first deformation threshold is a minimum deformation variable when the liquid injection device is irreversibly deformed.

[0017] Optionally, the pressure range is 0-0.4 Mpa or 0-0.6 Mpa.

[0018] Optionally, the liquid injection device is injected by using an isobaric liquid injection method.

[0019] Optionally, the liquid injection device is a lithium battery.

[0020] In a second aspect, an electronic device is also provided in the embodiments of the present application, which comprises at least one processor and a memory connected with the at least one processor in communication.

[0021] The memory stores a computer program which can be executed by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute any one of the high-pressure liquid injection control methods recorded in the embodiments of the present application.

[0022] In a third aspect, a computer readable storage medium is also provided in the embodiments of the present application, which stores computer instructions, and the computer instructions are used to enable a processor to implement any one of the high-pressure liquid injection control methods recorded in the embodiments of the present application when executed.

[0023] In a fourth aspect, the embodiments of the present application further provide a computer program product comprising a computer program which, when executed by a processor, implements any of the high-pressure liquid injection control methods described in the embodiments of the present application.

[0024] Compared with the prior art, the present application has the beneficial effects that: the present application proposes a high-pressure liquid injection control method, which comprises obtaining a deformation variable of a liquid injection device during liquid injection, determining whether the deformation variable is greater than a first deformation threshold, if the deformation variable is not greater than the first deformation threshold, no additional control is performed, if it is greater than the first deformation threshold, control is stopped to actively change the pressure difference between the inside of the liquid injection device and the liquid injection setting, after the control stops to actively change the pressure difference between the inside of the liquid injection device and the liquid injection setting, if the deformation variable is less than the first deformation threshold, the control continues to actively change the pressure difference between the inside of the liquid injection device and the liquid injection device, based on the deformation variable of the liquid injection device, the pressure difference between the inside of the liquid injection device and the liquid injection device is actively controlled, which can slow down the local pressure difference inside and outside the liquid injection device, reduce the deformation degree of the liquid injection device, avoid irreversible deformation of the liquid injection device, and avoid liquid leakage and other problems. In the present application, by determining the deformation threshold and the pressure interval based on the model of the liquid injection device, and combining real-time deformation variable monitoring and pressure difference control, the deformation variable during liquid injection can be accurately controlled. Because the liquid injection control can be personalized according to different models of the liquid injection device and environmental pressure, the liquid injection process can be widely applied to the production of various types of batteries. When switching between different models of products on the production line, there is no need to greatly adjust the parameters of the liquid injection device, only the model of the liquid injection device needs to be input, and the system can automatically adjust the control strategy, thereby improving the production efficiency and consistency of product quality. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a high-pressure liquid injection control method flowchart in the embodiments;

[0026] Figure 2 is another high-pressure liquid injection control method flowchart in the embodiments;

[0027] Figure 3 is a thickness increment curve schematic diagram in the embodiments;

[0028] Figure 4 is a thickness increment curve comparison schematic diagram in the embodiments;

[0029] Figure 5 is an electronic device structure schematic diagram in the embodiments. DETAILED DESCRIPTION

[0030] The application will be described in further detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are intended for explanation only and are not limiting of the application. In addition, it should be noted that only parts of the structures related to the application are shown in the drawings for ease of description.

[0031] Embodiment one

[0032] Figure 1 is a flow chart of the high-pressure liquid injection control method in the embodiment, referring to Figure 1 A high-pressure liquid injection control method comprises the following steps:

[0033] S101. Obtain the deformation amount of the liquid injection device during the liquid injection process.

[0034] In this scheme, the liquid injection device is a device that needs to be injected, and the device will produce a deformation that can be measured by a sensor under a certain force (for example, when there is a certain pressure difference between the inside of the device and the environment).

[0035] In this scheme, the deformation of the liquid injection device can be the size change in the length direction, width direction or height direction.

[0036] In this scheme, the deformation amount is obtained by measuring with a sensor, which can be a contact or non-contact sensor.

[0037] S102. When the deformation amount is greater than the first deformation threshold, control stops actively changing the pressure difference between the inside of the liquid injection device and the liquid injection equipment.

[0038] In this scheme, the deformation amount of the liquid injection device is set to be less than the first deformation threshold, and when the deformation amount of the liquid injection device is greater than the first deformation threshold, the liquid injection device is at risk of damage.

[0039] In this scheme, the first deformation threshold can be determined by trial, and for different liquid injection devices, the corresponding first deformation threshold can be different.

[0040] In this scheme, the liquid injection device can be injected by using isobaric liquid injection or differential pressure liquid injection, wherein for the above two injection methods, the process step of actively changing the pressure difference between the inside of the liquid injection device and the liquid injection equipment can be:

[0041] When the liquid injection device passes through the vacuum extraction and is in a negative pressure state, the pressure is adjusted by filling an appropriate amount of gas (such as nitrogen) into a specific chamber of the liquid injection device (such as the bell part of the bell isobaric liquid injection) to make the liquid injection device and the inside of the liquid injection device reach isobaric or form a small pressure difference (such as 0.1-0.5kPa) that is conducive to liquid injection.

[0042] For example, the method of controlling the pressure difference between the inside of the liquid injection device and the liquid injection equipment can be a method of controlling the stop of the injection of air into the liquid injection device.

[0043] S103. After the step of controlling the stop of the active change of the pressure difference between the inside of the liquid injection device and the liquid injection equipment, when the deformation value is less than the second deformation threshold, the method can further comprise a step of controlling the active change of the pressure difference between the inside of the liquid injection device and the liquid injection equipment.

[0044] In the present application, the second deformation threshold can be determined by experiments. For different liquid injection devices, the corresponding second deformation threshold can be the same or different.

[0045] Based on the content described in step S102, the method of controlling the active change of the pressure difference between the inside of the liquid injection device and the liquid injection equipment can be a method of controlling the injection of air into the liquid injection device.

[0046] For example, after the liquid injection device is in a negative pressure state by vacuumizing, the method can further comprise a step of changing the pressure of the liquid injection equipment or the sealed environment in which the liquid injection device is located.

[0047] For example, when the liquid injection device is vacuumized, the initial pressure of the sealed environment can be 0 Mpa, and the final target pressure of the sealed environment can be 1 Mpa, i.e., the pressure in the sealed environment is gradually increased from 0 Mpa to 1 Mpa during the liquid injection process.

[0048] During the above pressure increasing process, the method described in steps S101-S103 can be continuously performed until the pressure is increased to 1 Mpa.

[0049] For example, after the pressure of the sealed environment is increased, the method can further comprise a pressure relief process, i.e., the pressure in the sealed environment is restored to atmospheric pressure. During this process, the method described in steps S101-S103 can or can not be performed.

[0050] The embodiment provides a high-pressure liquid injection control method. The method comprises the following steps: obtaining a deformation variable of a liquid injection device in a liquid injection process; determining whether the deformation variable is greater than a first deformation threshold; if the deformation variable is not greater than the first deformation threshold, no additional control is performed; if the deformation variable is greater than the first deformation threshold, a pressure difference between an inside of the liquid injection device and a liquid injection device is controlled to stop being actively changed; and if the deformation variable is less than the first deformation threshold after the pressure difference between the inside of the liquid injection device and the liquid injection device is controlled to stop being actively changed, the pressure difference between the inside of the liquid injection device and the liquid injection device is controlled to be actively changed. The pressure difference between the inside of the liquid injection device and the liquid injection device is actively controlled based on the deformation variable of the liquid injection device, so that the local pressure difference between the inside and outside of the liquid injection device can be slowed down, the deformation degree of the liquid injection device can be reduced, irreversible deformation of the liquid injection device can be avoided, and liquid leakage can be avoided. In the liquid injection process, the deformation of the liquid injection device is mainly caused by the pressure difference between the inside of the liquid injection device and the liquid injection device, and the pressure in the inside of the liquid injection device cannot be detected. Therefore, it is difficult to effectively control the deformation variable of the liquid injection device by detecting the pressure of the liquid injection device or a sealed environment and controlling the liquid injection rate by using the pressure. In the present scheme, the liquid injection rate is controlled by the thickness change of the liquid injection device in the liquid injection process, so that the local pressure difference between the inside and outside of the liquid injection device can be slowed down, the deformation degree of the liquid injection device can be reduced, and irreversible deformation of the liquid injection device can be avoided.

[0051] Figure 2 Another high-pressure liquid injection control method flow chart in the embodiment is shown in Figure 2 , on the basis of the scheme shown in Figure 1 , in an implementable scheme, the method comprises the following steps:

[0052] S201. Obtain the model of the liquid injection device, and determine the first deformation threshold, the second deformation threshold and the pressure interval according to the model of the liquid injection device.

[0053] For example, in the present scheme, a liquid injection device model database is established, and detailed parameters of various models of liquid injection devices are collected in advance, including shell material, internal structure, theoretical maximum deformation variable and other information. The information is stored in the database, and an index corresponding to the model is established;

[0054] For example, for an LF280K model battery, the shell is made of a specific aluminum alloy material, the internal electrode structure has a specific layout, and the theoretical maximum deformation variable is 0.8 mm.

[0055] After the model of the liquid injection device is obtained, the relevant parameter information is quickly retrieved from the database.

[0056] For example, in the present scheme, the first deformation threshold and the second deformation threshold can be calculated according to the theoretical maximum deformation variable and other parameters of the liquid injection device.

[0057] For example, the first deformation threshold can be set to 40% of the theoretical maximum deformation amount, and the second deformation threshold can be set to 20% of the theoretical maximum deformation amount.

[0058] For example, the first deformation threshold can be set to 40% of the theoretical maximum deformation amount, and the second deformation threshold can be set to 20% of the theoretical maximum deformation amount.

[0059] For example, the first deformation threshold can be set to 40% of the theoretical maximum deformation amount, and the second deformation threshold can be set to 20% of the theoretical maximum deformation amount.

[0060] For example, the first deformation threshold can be set to 40% of the theoretical maximum deformation amount, and the second deformation threshold can be set to 20% of the theoretical maximum deformation amount.

[0061] For example, the first deformation threshold can be set to 40% of the theoretical maximum deformation amount, and the second deformation threshold can be set to 20% of the theoretical maximum deformation amount.

[0062] S203. When the deformation amount is greater than the first deformation threshold, control is stopped to actively change the pressure difference between the inside of the device to be filled and the liquid filling equipment.

[0063] S204. After controlling to stop actively changing the pressure difference between the inside of the device to be filled and the liquid filling equipment, when the deformation amount is less than the second deformation threshold, or when a preset time length is reached, control is actively changed to change the pressure difference between the inside of the device to be filled and the liquid filling equipment.

[0064] For example, the first deformation threshold can be set to 40% of the theoretical maximum deformation amount, and the second deformation threshold can be set to 20% of the theoretical maximum deformation amount.

[0065] For example, the first deformation threshold can be set to 40% of the theoretical maximum deformation amount, and the second deformation threshold can be set to 20% of the theoretical maximum deformation amount.

[0066] For example, the first deformation threshold can be set to 40% of the theoretical maximum deformation amount, and the second deformation threshold can be set to 20% of the theoretical maximum deformation amount.

[0067] For example, the first deformation threshold can be set to 40% of the theoretical maximum deformation amount, and the second deformation threshold can be set to 20% of the theoretical maximum deformation amount.

[0068] The electric regulating valve is installed on the air inlet pipeline and the air outlet pipeline, and can accurately regulate the gas flow according to the instruction of the microprocessor, so as to change the pressure difference. The pressure sensor is installed in the liquid injection device and the cavity of the liquid injection equipment respectively, and can monitor the pressure value in real time and feed back to the microprocessor.

[0069] For example, in this scheme, when the liquid injection starts and the pressure of the environment where the liquid injection device is located is in a certain pressure interval, the microprocessor continuously receives the deformation variable monitoring data;

[0070] Once the deformation variable is greater than the first deformation threshold, the microprocessor immediately sends an instruction to the electric regulating valve to stop actively changing the pressure difference, i.e. stop the air inlet or air outlet operation, and maintain the current pressure state;

[0071] When the deformation variable is less than the second deformation threshold, or reaches the preset time length, the microprocessor sends an instruction to the electric regulating valve again to restart the pressure difference adjustment operation.

[0072] In this scheme, by determining the deformation threshold and the pressure interval based on the type of the liquid injection device, and combining real-time deformation variable monitoring and pressure difference control, the deformation variable in the liquid injection process can be accurately controlled. Because the liquid injection control can be personalized according to different types of liquid injection devices and environmental pressures, the liquid injection process can be widely applied to the production of various types of batteries. When switching between different types of products on the production line, there is no need to greatly adjust the parameters of the liquid injection equipment. Only the type of the liquid injection device needs to be input, and the system can automatically adjust the control strategy, thereby improving the production efficiency and consistency of product quality.

[0073] On the basis of any of the preceding schemes, in an implementable scheme, when the deformation variable is greater than the first deformation threshold, a first valve control instruction is generated;

[0074] When the deformation variable is less than the second deformation threshold, a second valve control instruction is generated;

[0075] The first valve control instruction is used to control the air inlet valve to close, and the second valve control instruction is used to control the air inlet valve to open.

[0076] In this scheme, the air inlet valve is set to control the input or stop of the gas to a specific chamber of the liquid injection device. The air inlet valve is an electrically controlled valve, which can be opened and closed according to the first valve control instruction and the second valve control instruction.

[0077] On the basis of any of the preceding schemes, in an implementable scheme, the deformation variable is the thickness change of the liquid injection device.

[0078] In this scheme, the liquid injection device is set to be a square device, and the thickness change of the liquid injection device is measured by the thickness sensor.

[0079] Exemplarily, in the present solution, the thickness direction can be the direction in which the square device has the smallest size in the x, y, and z three-dimensional directions.

[0080] On the basis of any of the foregoing solutions, in an implementable solution, the first deformation threshold is set as the minimum deformation amount at which the irreversible deformation of the liquid injection device occurs.

[0081] In the present solution, the irreversible deformation of the liquid injection device starts when the deformation amount of the liquid injection device reaches the minimum deformation amount, for example, for a certain liquid injection device, the irreversible deformation starts when the deformation amount reaches 0.5 mm.

[0082] When the deformation amount exceeds 0.5 mm, the irreversible deformation can continue, for example, the deformation amount can continue to increase to 1.5 mm.

[0083] On the basis of any of the foregoing solutions, in an implementable solution, after the control of actively changing the pressure difference between the inside of the liquid injection device and the liquid injection equipment is stopped, when the deformation amount is less than the second deformation threshold or reaches a preset time length, the control of actively changing the pressure difference between the inside of the liquid injection device and the liquid injection equipment is performed.

[0084] In the present solution, when the deformation amount is less than the second deformation threshold or the time length of stopping the actively changing of the pressure difference between the inside of the liquid injection device and the liquid injection equipment reaches the preset time length, the control of actively changing the pressure difference between the inside of the liquid injection device and the liquid injection equipment is performed.

[0085] In the present solution, the preset time length can be determined by trial, and the preset time length should satisfy that after the preset time length, the deformation amount is at least less than the first deformation threshold.

[0086] On the basis of any of the foregoing solutions, in an implementable solution, it is set to use the isobaric liquid injection method to inject the liquid injection device.

[0087] On the basis of any of the foregoing solutions, in an implementable solution, it is set that the high-pressure liquid injection control method is suitable for high-pressure liquid injection of lithium batteries, and the injection pressure is set to 0.5 Mpa-2 Mpa, for example, the injection pressure can be specifically 1.5 Mpa.

[0088] In the present solution, it is set to use the bell jar isobaric liquid injection method to realize the liquid injection of lithium batteries, and the liquid injection system at least includes a bell jar, a sleeve cup, a thickness sensor, a liquid injection device, a vacuum system, and a control system.

[0089] The bell jar is used to provide a relatively sealed space during liquid injection, to create a stable environment for isobaric liquid injection, to protect the battery from the external environment during liquid injection, and to prevent impurities such as dust and moisture from entering the battery. During the liquid injection process, the pressure inside the bell jar can be accurately adjusted as needed to ensure that the pressure inside the battery is balanced;

[0090] The sleeve cup is used to connect with the battery. During liquid injection, the sleeve cup and the battery are placed in the bell jar, and the sleeve cup stores electrolyte. The sleeve cup is used to inject liquid into the battery;

[0091] The thickness sensor is used to measure the thickness change of the battery. The thickness sensor can be clamped on both sides of the tray, and the tray is used to place the battery;

[0092] The liquid injection device is used to fill an appropriate amount of gas (such as nitrogen) into the bell jar to adjust the pressure, so that the inside of the sleeve cup and the battery reaches isobaric or forms a pressure difference that is conducive to liquid injection;

[0093] The vacuum system is used to achieve the vacuumization and vacuum breaking operation of the inside of the bell jar and the battery. The pressure inside the bell jar and the battery is reduced to create the required vacuum degree for isobaric liquid injection;

[0094] The control system is used to adjust according to different battery specifications and liquid injection requirements, to ensure that the electrolyte can be injected into the battery at an appropriate speed and pressure (such as performing the high-pressure liquid injection control method described in this solution).

[0095] For example, in this solution, the working process of the liquid injection system includes:

[0096] The battery is weighed, and the weighed battery is transported to the tray. The sleeve cup is pressed with the battery, the battery is transported to the liquid injection station, the liquid injection station injects a certain amount of electrolyte into the sleeve cup, and the battery, tray and sleeve cup are placed in the bell jar;

[0097] Start the vacuum system to vacuumize the bell jar, remove impurities such as air and moisture inside the bell jar and the battery, to ensure the accuracy and stability of the liquid injection;

[0098] When the vacuum degree inside the bell jar and the battery reaches the required value, start the liquid injection device, fill an appropriate amount of gas (such as nitrogen) into the bell jar to adjust the pressure, and the control system will automatically adjust the liquid injection speed according to the measurement signal of the thickness sensor to ensure that the battery does not deform irreversibly;

[0099] When the amount of electrolyte injected into the battery or the battery cell reaches the required value, stop the liquid injection, and keep the pressure in the bell jar unchanged, so that the battery or the battery cell is placed under isobaric conditions for a period of time. The positive pressure is maintained for 20 seconds, the pressure is released, and then the negative pressure is extracted, and the cycle is repeated for 3-5 times, so that the electrolyte fully infiltrates the electrode material inside the battery or the battery cell, and the performance and cycle life of the battery are improved;

[0100] The pressure in the bell jar is restored to atmospheric pressure, and after the pressure in the bell jar is restored to atmospheric pressure, the bell jar is opened, and the battery after liquid injection is completed is taken out.

[0101] In this scheme, the control system controls the liquid injection speed specifically includes:

[0102] Obtain the deformation amount of the battery during the liquid injection process (i.e. the measurement of the thickness sensor);

[0103] When the deformation amount is greater than the first deformation threshold (for example, 0.5mm), a first valve control instruction is generated to control the air inlet valve (of the liquid injection device) to close;

[0104] During the liquid injection process, after the air inlet valve is closed, the deformation amount of the battery during the liquid injection process is obtained;

[0105] When the deformation amount is less than the second deformation threshold (for example, 0.3mm), or reaches a preset time length (for example, 1s), a second valve control instruction is generated to control the air inlet valve to open.

[0106] In this scheme, the air inlet rate in the bell jar is controlled by the opening and closing control of the air inlet valve, and when the deformation of the battery does not reach 0.5mm, no additional control is needed for the air inlet valve.

[0107] The control core of the air inlet valve switch is essentially to reduce the change of the pressure difference between the inside and outside of the battery (cell), and after the air inlet valve is closed, a hysteresis time is given to balance the pressure in the bell jar and the cell, to avoid the accumulation of the pressure difference.

[0108] For example, in this scheme, the first deformation threshold (0.5mm) and the second deformation threshold (0.3mm) are determined based on test data of a certain type of lithium battery, and if other batteries are used, the above deformation thresholds need to be re-verified.

[0109] When the thickness increment is greater than 0.5mm and the air inlet rate is higher than 5KPa / s, irreversible deformation of the cell will occur, and when the thickness increment is greater than 1.5mm, irreversible deformation of the cell has been reached.

[0110] The main reason for the deformation is that the electrolyte in the sleeve cup forms a liquid seal effect on the cell of the battery, causing the internal pressure of the cell to change out of sync with the pressure in the bell jar, causing the shell to deform.

[0111] Figure 3 is a thickness increment curve diagram in the embodiment, Figure 4 is a comparison diagram of the thickness increment curve in the embodiment, Figure 3 is a battery (thickness) increment curve diagram without executing the control method of the scheme, Figure 4 is a battery (thickness) increment curve diagram executing the control method of the scheme;

[0112] Reference Figure 3 and Figure 4 , with the control method proposed by the present solution can effectively control the thickness increment of the battery during the pressurization process. For the pressure change in the bell jar and the internal pressure of the battery, only the front section changes rapidly from 0 to 0.4MPa or 0.6MPa, and the pressure changes inside and outside are inconsistent, causing the deformation of the battery;

[0113] As long as the pressure change of the front section is controlled, the pressure growth of the rear section is very slow, and the internal and external pressure difference of the battery will not change sharply.

[0114] Example Two

[0115] Figure 5 A structural schematic diagram of an electronic device 10 that can be used to implement an embodiment of the present application is shown. The electronic device is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular telephones, smart phones, wearable devices (e.g., headsets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be examples only, and are not intended to limit the implementations of the present application described and / or claimed in this document.

[0116] As Figure 5 shown, the electronic device 10 includes at least one processor 11, and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11, wherein the memory stores a computer program that can be executed by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0117] A plurality of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0118] The processor 11 can be various general and / or special purpose processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs various methods and processes described above, such as the high-pressure liquid injection control method.

[0119] In some embodiments, the high-pressure liquid injection control method can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded onto the RAM 13 and executed by the processor 11, one or more steps of the high-pressure liquid injection control method described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to perform the high-pressure liquid injection control method by any other appropriate means, such as by means of firmware.

[0120] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (PLD), a computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0121] Computer programs for implementing the methods of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer program, when executed, enables the functions / acts specified in the flowcharts and / or block diagrams to be implemented. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine as a standalone software package and partially on a remote machine or entirely on a remote machine or server.

[0122] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer-readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of a machine-readable storage medium will include one or more lines of a program of instructions in a transitory signal, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0123] To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0124] The systems and techniques described herein can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described herein), or a combination of one or more such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0125] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. A server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, and solves the defects of large management difficulty and weak business scalability in traditional physical host and VPS service.

[0126] Embodiment three

[0127] The embodiment provides a computer program product, including a computer program, the computer program realizes any one of the high-pressure liquid injection control methods disclosed in the embodiments of the application when executed by a processor, and the high-pressure liquid injection control method and the advantages and effects are the same as the corresponding contents disclosed in the embodiment one, and details are not repeated here.

[0128] It should be noted that the above only describes the preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A high-pressure filling control method of a large capacity battery, characterized by, The method comprises: acquiring a model of a device to be filled with liquid, determining a first deformation threshold, a second deformation threshold and a pressure range according to the model of the device to be filled with liquid; when the pressure of an environment in which the device to be filled with liquid is located is in the pressure range, acquiring a deformation amount of the device to be filled with liquid during a liquid filling process; when the deformation amount is greater than the first deformation threshold, controlling to stop inflating the device to be filled with liquid; after controlling to stop inflating the device to be filled with liquid, when the deformation amount is less than the second deformation threshold or a preset time length is reached, controlling to inflate the device to be filled with liquid; determining the preset time length comprises: determining a pressure change rate of the environment in which the device to be filled with liquid is located, and determining the preset time length according to the pressure change rate.

2. The high-pressure injection control method of a large capacity battery according to claim 1, wherein when the deformation amount is greater than the first deformation threshold, generating a first valve control instruction; when the deformation amount is less than the second deformation threshold, generating a second valve control instruction; the first valve control instruction is used to control an air inlet valve to be closed, and the second valve control instruction is used to control the air inlet valve to be opened.

3. The high-pressure injection control method of a large capacity battery according to claim 1, wherein The deformation amount is a thickness change amount of the device to be filled with liquid.

4. The high-pressure injection control method of a large capacity battery according to claim 1, wherein The first deformation threshold is a minimum deformation amount when the device to be filled with liquid is irreversibly deformed.

5. The high-pressure filling control method of a large capacity battery according to claim 1, wherein The pressure range is 0-0.4 MPa or 0-0.6 MPa.

6. The high-pressure filling control method of a large capacity battery according to claim 1, wherein The device to be filled with liquid is filled with liquid by using an isobaric liquid filling method.

7. The high-pressure filling control method of a large capacity battery according to any one of claims 1 to 6, characterized by, The device to be filled with liquid is a lithium battery.

8. An electronic device, comprising: The method comprises at least one processor and a memory connected to the at least one processor in communication; The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the high-pressure liquid filling control method of the large-capacity battery according to any one of claims 1-7.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions for enabling the processor to execute the high-pressure liquid filling control method of the large-capacity battery according to any one of claims 1-7.

10. A computer program product, characterised in that, The computer program is executed by the processor to implement the high-pressure liquid filling control method of the large-capacity battery according to any one of claims 1-7.

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