High-pressure liquid injection control method and equipment of high-capacity battery, medium and product

Abstract

The invention discloses a high-pressure liquid injection control method and equipment for a high-capacity battery, a medium and a product, and the method comprises the following steps: obtaining the model of a device to be injected with liquid, and determining a first deformation threshold value, a second deformation threshold value and a pressure interval according to the model of the device to be injected with liquid; when the pressure of the environment where the to-be-injected device is located is in the pressure interval, the deformation quantity of the to-be-injected device in the liquid injection process is obtained; when the deformation quantity is greater than a first deformation threshold value, controlling to stop actively changing the pressure difference between the interior of the to-be-injected device and the injection equipment; after the pressure difference between the interior of the to-be-injected device and the liquid injection equipment is controlled to stop actively changing, when the deformation quantity is smaller than a second deformation threshold value or reaches a preset duration, the pressure difference between the interior of the to-be-injected device and the liquid injection equipment is controlled to be actively changed; the step of determining the preset duration comprises the substeps of determining the pressure change rate of the environment where the to-be-injected device is located, and determining the preset duration 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, equipment, medium and product for a large-capacity battery. Background Art

[0002] Lithium-ion power batteries are composed of components such as positive and negative electrodes, electrolytes, and aluminum shells. There are two common types of injection equipment: isobaric injection and differential pressure injection. Isobaric injection is divided into restrained isobaric injection and bell-type isobaric injection according to the type of equipment. The bell-type isobaric injection is currently used in a larger proportion in the industry. During the injection process, the electrolyte is quantitatively transported to the injection cup through the liquid storage tank, and the injection cup transports the electrolyte into the battery cell through positive and negative pressure circulation.

[0003] The injection pressure of square batteries is usually 0.2-0.6MPa, and the injection level is close to the bottleneck value. With the increase in market demand for capacity, the size of battery cells and the amount of electrolyte, the overall difficulty of injection increases and the injection time increases. At the same time, in order to increase the specific energy of the battery cells, the positive and negative electrode materials of the battery cells are developing in the direction of small particles, large specific surface area, thick electrodes and high compaction. The injection time and the degree of electrode wetting have gradually become bottlenecks in battery cell manufacturing.

[0004] At present, the industry's understanding of accelerated injection is mostly reflected in increasing the pressure. The pressure is increased to 1.5MPa, but it is difficult to increase the pressure, maintain the pressure, and release the pressure. In particular, there is no clear method for pressure control of high-pressure injection. Most of the time, the gas tank is directly connected to the cavity, causing a sudden change in the air pressure inside the cavity, resulting in instantaneous unequal pressure inside and outside the battery cell, and irreversible deformation of the battery cell. In severe cases, it will cause metal fatigue and cracks at the welding position of the battery cover, and the battery cell will leak. The equipment cannot achieve the effect of isobaric shell without deformation. Summary of the invention

[0005] The present invention provides a high-pressure liquid injection control method, equipment, medium and product for a large-capacity battery, so as to achieve the purpose of effectively controlling the deformation amount of the battery (battery core) during the liquid injection process.

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

[0007] Obtaining the model of the device to be injected with liquid, and determining the first deformation threshold, the second deformation threshold and the pressure range according to the model of the device to be injected with liquid;

[0008] When the pressure of the environment of the device to be injected is within the pressure range, obtaining the deformation amount of the device to be injected during the injection process;

[0009] When the deformation amount is greater than a first deformation threshold, controlling to stop actively changing the pressure difference between the inside of the device to be injected and the injection equipment;

[0010] After the control stops actively changing the pressure difference between the inside of the device to be injected and the injection device, when the deformation amount is less than the second deformation threshold, or reaches a preset time, the control actively changes the pressure difference between the inside of the device to be injected and the injection device;

[0011] Determining the preset time length includes: determining a pressure change rate of an environment in which the device to be injected is located, and determining the preset time length according to the pressure change rate.

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

[0013] When the deformation amount is less than the second deformation threshold, generating a second valve control instruction;

[0014] The first valve control instruction is used to control the intake valve to close, and the second valve control instruction is used to control the intake valve to open.

[0015] Optionally, the deformation amount is a thickness change of the device to be injected with liquid.

[0016] Optionally, the first deformation threshold is the minimum deformation amount when the device to be injected with liquid undergoes irreversible deformation.

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

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

[0019] Optionally, the device to be injected with liquid is a lithium battery.

[0020] In a second aspect, an embodiment of the present invention further provides an electronic device, comprising at least one processor, and a memory communicatively connected to the at least one processor;

[0021] 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 so that the at least one processor can execute any one of the high-pressure liquid injection control methods described in the embodiments of the present invention.

[0022] In a third aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium 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 invention when executed.

[0023] In a fourth aspect, an embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements any one of the high-pressure liquid injection control methods described in the embodiments of the present invention.

[0024] Compared with the prior art, the beneficial effect of the present invention is that: the present invention proposes a high-pressure liquid injection control method, which includes obtaining the deformation of the device to be injected during the liquid injection process, judging whether the deformation is greater than the first deformation threshold, if the deformation is not greater than the first deformation threshold, no additional control is performed, if it is greater, the control stops actively changing the pressure difference between the inside of the device to be injected and the liquid injection setting, after the control stops actively changing the pressure difference between the inside of the device to be injected and the liquid injection setting, if the deformation is less than the first deformation threshold, the control continues to actively change the pressure difference between the inside of the device to be injected and the liquid injection equipment, and actively controls the pressure difference between the inside of the device to be injected and the liquid injection equipment based on the deformation of the device to be injected, which can reduce the local pressure difference inside and outside the device to be injected, reduce the deformation degree of the device to be injected, avoid irreversible deformation of the device to be injected, and avoid leakage and other problems. In this scheme, by determining the deformation threshold and pressure range based on the model of the device to be injected, and combining real-time deformation monitoring and pressure difference control, the deformation in the liquid injection process can be accurately controlled. Since the injection process can be personalized according to different types of devices to be injected and environmental pressure, it can be widely used in the production of various types of batteries. When switching between different types of products on the production line, there is no need to significantly adjust the parameters of the injection equipment. You only need to enter the model of the device to be injected, and the system can automatically adjust the control strategy, thereby improving production efficiency and consistency of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flow chart of a high-pressure liquid injection control method in an embodiment;

[0026] Figure 2 is another high-pressure liquid injection control method flow chart in the embodiment;

[0027] Figure 3 is a schematic diagram of a thickness increment curve in an embodiment;

[0028] Figure 4 is a schematic diagram for comparing thickness increment curves in the embodiments;

[0029] Figure 5 Schematic diagram of the structure of an electronic device in an embodiment. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] Embodiment 1

[0032] Figure 1 is a flow chart of the high pressure liquid injection control method in the embodiment, refer to Figure 1 , the high pressure injection control methods include:

[0033] S101. Obtaining the deformation of the device to be injected during the injection process.

[0034] In this solution, the device to be injected 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 solution, the deformation of the device to be injected may be set as a dimensional change in the length direction, the width direction or the height direction.

[0036] In this solution, the set deformation amount is obtained by measuring the sensor, and the sensor can be a contact or non-contact sensor.

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

[0038] In this solution, it is set that the deformation amount of the device to be injected should be smaller than the first deformation threshold, and it is set that when the deformation amount of the device to be injected is larger than the first deformation threshold, there is a risk of damage to the device to be injected.

[0039] In this solution, the first deformation threshold value can be determined by experiment, and the corresponding first deformation threshold value can be different for different devices to be injected with liquid.

[0040] In this solution, the device to be injected can be injected by isobaric injection or differential pressure injection. For the above two injection methods, the process steps for actively changing the pressure difference between the inside of the device to be injected and the injection equipment can be:

[0041] When the device to be injected is in a negative pressure state after being evacuated, the pressure is adjusted by filling a proper amount of gas (such as nitrogen) into a specific chamber of the injection device (such as the bell jar part in the bell jar type isobaric injection) so that the injection device and the inside of the device to be injected reach equal pressure or form a small pressure difference (such as 0.1-0.5 kPa) that is beneficial to injection.

[0042] Exemplarily, in the present embodiment, controlling to stop actively changing the pressure difference between the inside of the device to be injected and the injection equipment may be controlling to stop inflating air into the injection device.

[0043] S103. After the control stops actively changing the pressure difference between the inside of the device to be injected and the injection equipment, when the deformation amount is less than the second deformation threshold, the control actively changes the pressure difference between the inside of the device to be injected and the injection equipment.

[0044] In this solution, the second deformation threshold can be determined by experiment, and for different devices to be injected with liquid, the corresponding second deformation thresholds can be the same or different.

[0045] Based on the content recorded in step S102, actively changing the pressure difference between the inside of the device to be injected and the injection equipment can be controlled to inflate air into the injection device.

[0046] Exemplarily, in this solution, after the device to be injected is evacuated to a negative pressure state, the pressure of the sealed environment of the injection device or the device to be injected is changed;

[0047] For example, when the device to be injected is vacuumed, the initial pressure of the sealed environment may be 0 MPa, and the final target pressure of the sealed environment may be 1 MPa, that is, during the injection process, the pressure in the sealed environment is gradually increased from 0 MPa to 1 MPa;

[0048] During the pressurization process, the method described in steps S101 to S103 is continuously performed until the pressure is increased to 1 MPa.

[0049] Illustratively, in this solution, after the sealed environment is pressurized, a pressure relief process may also be included, that is, the pressure in the sealed environment is restored to atmospheric pressure. In this process, the method described in steps S101 to S103 may or may not be executed.

[0050] The present embodiment proposes a high-pressure liquid injection control method, which includes obtaining the deformation amount of the device to be injected during the liquid injection process, judging whether the deformation amount is greater than a first deformation threshold value, and if the deformation amount is not greater than the first deformation threshold value, no additional control is performed; if it is greater, the control stops actively changing the pressure difference between the inside of the device to be injected and the liquid injection setting; after the control stops actively changing the pressure difference between the inside of the device to be injected and the liquid injection setting, if the deformation amount is less than the first deformation threshold value, the control continues to actively change the pressure difference between the inside of the device to be injected and the liquid injection equipment. Actively controlling the pressure difference between the inside of the device to be injected and the liquid injection equipment based on the deformation amount of the device to be injected can reduce the local pressure difference between the inside and outside of the device to be injected, reduce the deformation degree of the device to be injected, avoid irreversible deformation of the device to be injected, and avoid leakage and other problems. During the injection process, the deformation of the device to be injected is mainly caused by the pressure difference between the inside of the device to be injected and the injection equipment, and the pressure inside the device to be injected is usually undetectable. Therefore, it is difficult to effectively control the deformation of the device to be injected by detecting the pressure of the injection equipment or the sealed environment and using the pressure to control the injection rate. In this scheme, the injection rate is controlled by the change in the thickness of the device to be injected during the injection process, which can reduce the local pressure difference between the inside and outside of the device to be injected, reduce the deformation degree of the device to be injected, and avoid irreversible deformation of the device to be injected.

[0051] Figure 2 is another high pressure liquid injection control method flow chart in the embodiment, refer to Figure 2 ,exist Figure 1 Based on the scheme shown, in one possible implementation scheme, the method includes:

[0052] S201. Obtain the model of the device to be injected with liquid, and determine the first deformation threshold, the second deformation threshold and the pressure range according to the model of the device to be injected with liquid.

[0053] Exemplarily, in this solution, a database of models of devices to be injected is established, and detailed parameters of various models of devices to be injected are collected in advance, including information such as shell material, internal structure, theoretical maximum deformation, etc. This information is stored in the database, and an index corresponding to the model is established;

[0054] For example, for the LF280K battery cell, its shell is made of a specific aluminum alloy, the internal electrode structure has a specific layout, and the theoretical maximum deformation is 0.8mm;

[0055] After obtaining the model of the device to be injected, the relevant parameter information is quickly retrieved from the database.

[0056] Exemplarily, in this solution, the first deformation threshold and the second deformation threshold may be calculated based on parameters such as the theoretical maximum deformation amount of the device to be injected with liquid;

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

[0058] For example, in this solution, based on factors such as the material strength and sealing performance of the device to be injected, the interval in which the pressure changes faster during the injection process can be determined through experiments or simulation tests;

[0059] For example, for some high-strength, well-sealed devices to be injected, the pressure range can be set to 0.3Mpa~0.8MPa; while for some relatively fragile devices or devices with slightly poor sealing performance, the pressure range may be 0.2Mpa~0.6MPa.

[0060] S202. When the pressure of the environment of the device to be injected is within the pressure range, the deformation amount of the device to be injected during the injection process is obtained.

[0061] Exemplarily, in this solution, high-precision laser displacement sensors or strain gauge sensors can be installed at key locations (such as the center and edge of a large surface) of the device to be injected to monitor the deformation in real time.

[0062] S203. When the deformation amount is greater than the first deformation threshold, the control stops actively changing the pressure difference between the inside of the device to be injected and the injection equipment.

[0063] S204. After the control stops actively changing the pressure difference between the inside of the device to be injected and the injection equipment, when the deformation amount is less than the second deformation threshold, or reaches a preset time, the control actively changes the pressure difference between the inside of the device to be injected and the injection equipment.

[0064] Exemplarily, in this solution, determining the preset time period includes: determining a pressure change rate of an environment in which the device to be injected is located, and determining the preset time period according to the pressure change rate.

[0065] For example, in this solution, a mathematical model between the pressure change rate and the preset time can be established. The mathematical model is trained based on a large amount of experimental data and theoretical analysis, and the trained mathematical model is used to determine the appropriate preset time under different pressure change rates;

[0066] For example, when the pressure change rate is high (such as greater than 0.3MPa / s), the preset time length can be set shorter, such as 0.5s; when the pressure change rate is low (such as less than 0.1MPa / s), the preset time length can be set longer, such as 1.5s.

[0067] Exemplarily, in this solution, a high-precision electric regulating valve and a pressure sensor are used to control the pressure difference between the inside of the device to be injected and the injection equipment;

[0068] The electric regulating valve is installed on the air intake and exhaust pipes, and can accurately adjust the gas flow according to the instructions of the microprocessor, thereby changing the pressure difference. The pressure sensors are installed inside the device to be injected and the cavity of the injection equipment, respectively, to monitor the pressure value in real time and feed it back to the microprocessor.

[0069] Exemplarily, in this solution, when the injection starts and the pressure of the environment of the device to be injected is in a certain pressure range, the microprocessor continuously receives deformation monitoring data;

[0070] Once the deformation amount is greater than the first deformation threshold, the microprocessor immediately sends a command to the electric control valve to stop actively changing the pressure difference, that is, to stop the intake or exhaust operation and maintain the current pressure state;

[0071] When the deformation amount is less than the second deformation threshold, or reaches a preset time, the microprocessor sends a command to the electric control valve again to restart the pressure difference adjustment operation.

[0072] In this solution, the deformation threshold and pressure range are determined based on the model of the device to be injected, and the deformation during the injection process can be accurately controlled by combining real-time deformation monitoring and pressure difference control. Since personalized injection control can be performed according to different models of devices to be injected and ambient pressure, the injection process can be widely used in the production of various types of batteries. When switching between different models of products on the production line, there is no need to significantly adjust the parameters of the injection equipment. You only need to enter the model of the device to be injected, and the system can automatically adjust the control strategy, thereby improving production efficiency and product quality consistency.

[0073] Based on any of the above solutions, in one possible implementation, when the deformation amount is greater than a first deformation threshold, a first valve control instruction is generated;

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

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

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

[0077] Based on any of the foregoing solutions, in one possible implementation scheme, the deformation amount is the thickness change of the device to be injected with liquid.

[0078] In this solution, the device to be injected is set as a square device, and a thickness sensor is used to measure the thickness change of the device to be injected.

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

[0080] On the basis of any of the foregoing solutions, in one possible implementation scheme, the first deformation threshold is set as the minimum deformation amount when the device to be injected undergoes irreversible deformation.

[0081] In this solution, it is assumed that when the deformation of the device to be injected reaches the minimum deformation, the device to be injected begins to undergo irreversible deformation. For example, for a certain device to be injected, when the deformation reaches 0.5 mm, irreversible deformation begins to occur.

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

[0083] Based on any of the foregoing schemes, in one feasible implementation scheme, after the control stops actively changing the pressure difference between the inside of the device to be injected and the injection equipment, when the deformation amount is less than the second deformation threshold, or reaches a preset time length, the control actively changes the pressure difference between the inside of the device to be injected and the injection equipment.

[0084] In this solution, when the deformation amount is less than the second deformation threshold or the duration of stopping actively changing the pressure difference between the inside of the device to be injected and the injection equipment reaches a preset duration, the pressure difference between the inside of the device to be injected and the injection equipment is actively changed.

[0085] In this solution, the preset time length can be determined by experiment, 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] Based on any of the foregoing schemes, in one possible implementation scheme, it is set to use an isobaric injection method to inject liquid into the device to be injected.

[0087] Based on any of the foregoing schemes, in one possible implementation scheme, the high-pressure injection control method is set to be applicable to high-pressure injection of lithium batteries, and the injection pressure is set to 0.5Mpa to 2Mpa. For example, the injection pressure can be specifically 1.5Mpa.

[0088] In this scheme, it is assumed that the bell-shaped isobaric injection method is used to inject the lithium battery, and the injection system at least includes a bell-shaped jar, a sleeve cup, a thickness sensor, an injection device, a vacuum system, and a control system;

[0089] The bell jar is used to provide a relatively sealed space during injection, creating a stable environment for isobaric injection, protecting the battery from the influence of the external environment during the injection process, and preventing impurities such as dust and moisture from entering the battery. During the injection process, the pressure inside the bell jar can be precisely adjusted as needed to ensure that it is balanced with the pressure inside the battery;

[0090] The sleeve cup is used to connect with the battery. When injecting liquid, the sleeve cup and the battery are arranged in the bell jar. The electrolyte is stored in the sleeve cup, and the electrolyte is injected into the battery by using the sleeve cup.

[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 the bell jar with an appropriate amount of gas (such as nitrogen) to adjust the pressure so that the cup and the inside of the battery reach equal pressure or form a pressure difference that is conducive to liquid injection;

[0093] The vacuum system is used to realize the vacuum pumping and breaking operations inside the bell jar and the battery. It reduces the pressure inside the bell jar and the battery to create the required vacuum degree for isobaric injection;

[0094] The control system is used to make adjustments according to different battery specifications and injection requirements to ensure that the electrolyte can be injected into the battery at an appropriate speed and pressure (for example, executing the high-pressure injection control method recorded in this solution).

[0095] Exemplarily, in this solution, the working process of the injection system includes:

[0096] Weigh the battery, transport the weighed battery to the tray, press the cup and the battery together, transport the battery to the injection station, inject a fixed amount of electrolyte into the cup at the injection station, and place the battery, tray and cup into the bell jar;

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

[0098] When the vacuum degree inside the bell jar and the battery reaches the required level, the liquid injection device is started to fill the bell jar with an appropriate amount of gas (such as nitrogen) to adjust the pressure. The control system automatically adjusts the liquid injection speed according to the measurement signal of the thickness sensor to ensure that the battery will not have irreversible deformation.

[0099] When the amount of electrolyte injected into the battery or battery core reaches the requirement, stop injecting the electrolyte and keep the pressure in the bell jar unchanged. Let the battery or battery core stand for a period of time under isobaric conditions, keep the positive pressure for 20 seconds, release the pressure, and then pump negative pressure. Repeat this cycle 3 to 5 times to allow the electrolyte to fully infiltrate the electrode materials inside the battery or battery core, thereby improving the battery performance and cycle life.

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

[0101] In this solution, the control system controls the injection speed specifically including:

[0102] Obtain the deformation of the battery during the filling process (i.e., the measurement value of the thickness sensor);

[0103] When the deformation amount is greater than a first deformation threshold (for example, 0.5 mm), a first valve control instruction is generated, and the air intake valve (of the liquid injection device) is controlled to be closed by the first valve control instruction;

[0104] During the liquid filling process, when the air inlet valve is closed, the deformation of the battery during the liquid filling process is obtained;

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

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

[0107] The core control of the intake valve switch is essentially to reduce the pressure difference between the inside and outside of the battery (cell). When the intake valve is closed, a hysteresis time is given for the pressure inside the bell jar and the cell to balance, thereby avoiding the accumulation of pressure difference.

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

[0109] When the thickness increment is greater than 0.5mm and the air intake rate is higher than 5KPa / s, the battery cell will undergo irreversible deformation. When the thickness increment is greater than 1.5mm, the battery cell has reached irreversible deformation.

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

[0111] Figure 3 is a schematic diagram of a thickness increment curve in an embodiment, Figure 4 is a schematic diagram of thickness increment curve comparison in the embodiment, Figure 3 It is a schematic diagram of the battery (thickness) increment curve without implementing the control method of this solution. Figure 4 It is a schematic diagram of the battery (thickness) increment curve for executing the control method of this scheme;

[0112] refer to Figure 3 and Figure 4 The control method proposed in this scheme can effectively control the thickness increment of the battery during the pressurization process. For the pressure changes inside the bell jar and the battery cell, only the change rate from 0 to 0.4MPa or 0.6MPa in the front section is fast, and the pressure changes inside and outside are inconsistent, causing deformation of the battery cell.

[0113] As long as the pressure change in the front section is controlled, the pressure increase in the rear section will be very slow, and the pressure difference between the inside and outside of the battery cell will not change dramatically.

[0114] Embodiment 2

[0115] Figure 5 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0116] like Figure 5 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and 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 to 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 number 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 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 may be a variety of general and / or special 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 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 executes the various methods and processes described above, such as the high-pressure injection control method.

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

[0120] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0121] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0122] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, 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 disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0123] To provide interaction with a user, the systems and techniques described herein may 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 trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0124] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may 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] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may 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 to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0126] Embodiment 3

[0127] This embodiment provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements any one of the high-pressure liquid injection control methods recorded in the embodiments of the present invention. The high-pressure liquid injection control method and beneficial effects are the same as the corresponding contents recorded in Example 1, and will not be repeated here.

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

Claims

1. A high-pressure liquid injection control method, characterized in that: include: Obtaining the model of the device to be injected with liquid, and determining the first deformation threshold, the second deformation threshold and the pressure range according to the model of the device to be injected with liquid; When the pressure of the environment of the device to be injected is within the pressure range, obtaining the deformation amount of the device to be injected during the 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 device to be injected and the injection equipment; After the control stops actively changing the pressure difference between the inside of the device to be injected and the injection device, when the deformation amount is less than the second deformation threshold, or reaches a preset time, the control actively changes the pressure difference between the inside of the device to be injected and the injection device; Determining the preset time length includes: determining a pressure change rate of an environment in which the device to be injected is located, and determining the preset time length according to the pressure change rate.

2. The high-pressure liquid injection control method according to claim 1, characterized in that: 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 the intake valve to close, and the second valve control instruction is used to control the intake valve to open.

3. The high-pressure liquid injection control method according to claim 1, characterized in that: The deformation amount is the thickness change of the device to be injected with liquid.

4. The high-pressure liquid injection control method according to claim 1, characterized in that: The first deformation threshold is the minimum deformation amount when the device to be injected with liquid undergoes irreversible deformation.

5. The high-pressure liquid injection control method according to claim 1, characterized in that: The pressure range is 0-0.4Mpa or 0-0.6Mpa.

6. The high-pressure liquid injection control method according to claim 1, characterized in that: The device to be injected is injected with liquid by adopting an isobaric injection method.

7. The high-pressure liquid injection control method according to any one of claims 1 to 6, characterized in that: The device to be injected with liquid is a lithium battery.

8. An electronic device, characterized in that: comprising at least one processor, and a memory communicatively connected to the at least one processor; The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the high-pressure liquid injection control method according to any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the high-pressure liquid injection control method according to any one of claims 1 to 7 when executed.

10. A computer program product, characterized in that The invention comprises a computer program, which, when executed by a processor, implements the high-pressure liquid injection control method according to any one of claims 1 to 7.

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