Lithium battery temperature sensing liquid injection control method, device and equipment and storage medium

Abstract

The invention discloses a lithium battery temperature sensing liquid injection control method, device and equipment and a storage medium, and relates to the technical field of lithium batteries. The lithium battery temperature sensing liquid injection control method comprises the following steps: outputting an electrolyte with a target weight by using a liquid injection pump at a preset reference temperature, and measuring a reference volume corresponding to the electrolyte with the target weight; based on the single-rotation output volume of the screw rod of the liquid injection pump, the number of initial rotation turns for outputting the reference volume is determined; acquiring the temperature of the current electrolyte in real time, and comparing the temperature with the reference temperature to determine a temperature difference value; and matching a corresponding volume expansion coefficient according to the type of the electrolyte, and performing compensation calculation on the initial rotation turns in combination with the temperature difference value to obtain the target rotation turns after current temperature compensation. According to the invention, the problem that the performance of the battery is reduced due to the fact that the density of the electrolyte changes along with the change of the temperature of the electrolyte and the original preset volume of the liquid injection pump cannot represent the original required liquid injection weight is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a temperature-sensing liquid injection control method, device, equipment and storage medium for lithium batteries. Background Art

[0002] The electrolyte injection process is a crucial step in battery manufacturing, and the actual electrolyte volume injected into the battery cell has a significant impact on its performance. During the electrolyte injection process, a fixed weight of electrolyte needs to be injected into the battery cell. Currently, the electrolyte injection pump is mainly used to preset a fixed volume to represent a fixed weight of electrolyte.

[0003] In the prior art, an injection pump pumps out a fixed volume of electrolyte each time the screw inside the pump rotates, using a preset fixed number of revolutions to pump out a fixed volume of electrolyte, thereby achieving the injection requirement of a fixed weight of electrolyte. However, when the electrolyte temperature changes, the density of the electrolyte also changes accordingly. The originally preset volume of the injection pump can no longer represent the original required injection weight, resulting in a problem of reduced battery performance. No effective solution has yet been proposed. Summary of the Invention

[0004] Purpose of the invention: To provide a lithium battery temperature-sensing liquid injection control method, device, equipment and storage medium to solve at least one of the problems existing in the above-mentioned prior art.

[0005] Technical solution: A lithium battery temperature-sensing liquid injection control method, comprising: At a preset reference temperature, use an injection pump to output a target weight of electrolyte, and measure the reference volume corresponding to the target weight of electrolyte; Based on the output volume of the injection pump screw per rotation, determine the initial number of rotations required to output the reference volume; Obtain the current electrolyte temperature in real time and compare it with the reference temperature to determine the temperature difference; Matching the volume expansion coefficient corresponding to the electrolyte type and calculating the compensation for the initial number of rotations in combination with the temperature difference to obtain a target number of rotations after current temperature compensation; The injection pump is controlled to perform electrolyte injection operation according to the target number of rotations, so that electrolytes at different temperatures can be accurately injected.

[0006] Preferably, the method further comprises: determining the initial number of rotations for outputting the reference volume based on the output volume of the screw rod of the injection pump per rotation; At a preset reference temperature, the reference volume V0 is divided by the theoretical output volume V of a single turn of the screw to obtain the theoretical number of turns R0, which is then multiplied by the volumetric efficiency correction coefficient η; wherein the volumetric efficiency correction coefficient η is obtained through a multi-speed calibration test, and the calibration test includes: measuring the ratio of the actual output volume of the injection pump to the theoretical volume at at least three different speeds.

[0007] Preferably, the volume expansion coefficient is matched to the electrolyte type, including: A pre-established electrolyte parameter database is retrieved, wherein the database stores the volume expansion coefficient β values ​​and corresponding nonlinear fitting functions of different electrolyte models within a specific temperature range; wherein the database automatically matches the current electrolyte model by scanning the electrolyte packaging identification code.

[0008] Preferably, matching the volume expansion coefficient corresponding to the electrolyte type and performing compensation calculation on the initial number of rotations in combination with the temperature difference to obtain the target number of rotations after current temperature compensation include: The volume expansion coefficient β of the electrolyte can be obtained by consulting the liquid volume expansion coefficient table, or it can be estimated using the following calculation formula: β≈δV / (V0*δT)); Then, at the current temperature, using the injection pump to pump out the target weight of electrolyte, the actual volume should be: V1=V0*(1+β*δT); The number of revolutions that the injection pump needs to rotate at the current temperature can be obtained. The calculation formula is as follows: R1=R0*(1+β*δT).

[0009] Preferably, the method further comprises: matching the volume expansion coefficient corresponding to the electrolyte type, and performing compensation calculation on the initial number of rotations in combination with the temperature difference to obtain a target number of rotations after current temperature compensation; When it is detected that the temperature difference exceeds a preset threshold, a nonlinear compensation model including a quadratic term is used to calculate the target number of rotations R1, where the coefficient of the quadratic term is 50% of the product of the square of the volume expansion coefficient β and the square of the temperature difference.

[0010] Preferably, after controlling the injection pump to perform electrolyte injection operation according to the target number of revolutions so as to accurately inject electrolyte at different temperatures, the method further includes: a closed-loop correction step, The actual injection weight is weighed. If the deviation between the actual injection weight and the target weight exceeds the allowable error threshold, the volume expansion coefficient β is reversely corrected based on the weight deviation value, and the target number of rotations is recalculated to perform the refilling operation.

[0011] Preferably, the actual injection weight is weighed. If the deviation between the actual injection weight and the target weight exceeds the allowable error threshold, the volume expansion coefficient β is reversely corrected based on the weight deviation value, and the target number of rotations is recalculated to perform the refilling operation, including: During the first injection, the injection pump is controlled to output 90%-95% of the target weight, and the precise number of compensation turns required for the remaining injection volume is calculated based on the weighing result after the first injection.

[0012] In order to achieve the above-mentioned objectives, according to another aspect of the present application, a lithium battery temperature-sensing liquid injection control system is provided.

[0013] The lithium battery temperature sensing liquid injection control system according to the present application includes: A reference volume measurement module is used to output a target weight of electrolyte using an injection pump at a preset reference temperature and measure a reference volume corresponding to the target weight of electrolyte; An initial rotation number determination module is used to determine the initial rotation number for outputting a reference volume based on the output volume of the screw rod of the injection pump per rotation; The module for collecting and determining the temperature difference is used to obtain the current electrolyte temperature in real time and compare it with the reference temperature to determine the temperature difference; a calculation and compensation module, configured to match a corresponding volume expansion coefficient according to the type of electrolyte, and perform compensation calculation on the initial number of rotations in combination with the temperature difference to obtain a target number of rotations after current temperature compensation; The liquid injection control module is used to control the liquid injection pump to perform electrolyte injection operation according to the target number of rotations, so that electrolyte at different temperatures can be accurately injected.

[0014] In order to achieve the above-mentioned purpose, according to another aspect of the present application, an electronic device is provided, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein 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 lithium battery temperature-sensing liquid injection control method described in any one of the present inventions.

[0015] In order to achieve the above-mentioned purpose, according to another aspect of the present application, a computer-readable storage medium is provided, in which computer instructions are stored. The computer instructions are used to enable a processor to implement the lithium battery temperature-sensing liquid injection control method described in any one of the present inventions when executed.

[0016] Beneficial effect: In the embodiment of the present application, an automatic correction method for the injection volume is adopted. By using an injection pump to output a target weight of electrolyte at a preset reference temperature, and measuring the reference volume corresponding to the target weight of electrolyte; based on the single-turn output volume of the injection pump screw, the initial number of rotations for the output reference volume is determined; the current electrolyte temperature is obtained in real time and compared with the reference temperature to determine the temperature difference; the corresponding volume expansion coefficient is matched according to the electrolyte type, and the initial number of rotations is compensated and calculated in combination with the temperature difference to obtain the target number of rotations after current temperature compensation; the injection pump is controlled to perform electrolyte injection operation according to the target number of rotations, so that electrolyte at different temperatures can be accurately injected, thereby achieving the purpose of accurately controlling the battery injection weight under different temperature conditions, thereby realizing the technical effect of improving the injection accuracy and battery performance, and further solving the technical problem that when the electrolyte temperature changes, the density of the electrolyte also changes accordingly, and the originally preset volume of the injection pump can no longer represent the original required injection weight, thereby reducing the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 1 is a flow chart of a lithium battery temperature-sensing liquid injection control method according to an embodiment of the present application; Figure 2 is a structural diagram of a lithium battery temperature sensing liquid injection control system according to an embodiment of the present application; and Figure 3 Schematic diagram of the structure of an electronic device according to the lithium battery temperature sensing liquid injection control method of an embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0020] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0021] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] According to an embodiment of the present invention, a method for controlling temperature-sensing liquid injection of a lithium battery is provided. Figure 1 As shown, the method includes the following steps S101 to S105: Step S101: at a preset reference temperature, use an injection pump to output a target weight of electrolyte, and measure a reference volume corresponding to the target weight of electrolyte; Specifically, at a preset reference temperature (such as 25° C.), a target weight (such as 500 g) of electrolyte is output through an injection pump.

[0023] Measure the corresponding volume (V0): electrolyte density ρ = M / V0, establishing a benchmark relationship between weight and volume.

[0024] It can eliminate the influence of temperature on density and ensure the benchmark accuracy of subsequent compensation.

[0025] Step S102: determining the initial number of revolutions required to output a reference volume based on the output volume per single revolution of the screw of the injection pump; Specifically, the theoretical output volume (V) of a single screw revolution is determined by the mechanical design parameters (such as the screw lead and diameter), and the initial number of turns R0 = V0 / V, which converts the volume requirement into mechanical motion.

[0026] A direct mapping relationship between mechanical movement and injection volume can be established.

[0027] According to an embodiment of the present invention, preferably, determining the initial number of rotations for outputting the reference volume based on the output volume of the screw rod of the injection pump per rotation further includes: At a preset reference temperature, the reference volume V0 is divided by the theoretical output volume V of a single turn of the screw to obtain the theoretical number of turns R0, which is then multiplied by the volumetric efficiency correction coefficient η; wherein the volumetric efficiency correction coefficient η is obtained through a multi-speed calibration test, and the calibration test includes: measuring the ratio of the actual output volume of the injection pump to the theoretical volume at at least three different speeds.

[0028] It can further improve the calculation accuracy and thus reduce the error.

[0029] It should be noted that the volumetric efficiency correction factor η can be obtained by running the injection pump at low speed (10 rpm), medium speed (30 rpm), and high speed (50 rpm) at the reference temperature, and measuring the actual output volume (V_actual) and the theoretical volume (V_theoretical).

[0030] Calculate η = V_actual / V_theoretical and take the average of three tests (e.g., η = 0.98).

[0031] Corrected formula: R0=(V0 / V)×η.

[0032] It can compensate for the loss of volumetric efficiency caused by mechanical wear and clearance.

[0033] Necessity of multi-speed calibration: Differences in liquid rheological properties at different speeds lead to volume deviations.

[0034] Example: The η values ​​of a certain injection pump measured at 10 / 30 / 50 rpm were 0.99 / 0.97 / 0.95 respectively, and η was finally taken as 0.97.

[0035] Step S103: obtaining the current electrolyte temperature in real time, and comparing it with the reference temperature to determine the temperature difference; Specifically, the real-time temperature (T1) is obtained through multi-point sensors (weighted average of the three points of the liquid storage tank, pipeline, and liquid filling port), and the temperature difference δT=T1-T0 is used to quantify the temperature change amplitude; accurate temperature difference can be obtained, and the temperature difference is the core variable for triggering compensation.

[0036] It can achieve real-time temperature collection effect, so as to determine the accurate temperature difference.

[0037] Step S104: matching the corresponding volume expansion coefficient according to the electrolyte type, and performing compensation calculation on the initial number of rotations in combination with the temperature difference to obtain a target number of rotations after current temperature compensation; A good calculation compensation effect can be achieved, thereby obtaining an accurate target number of rotations.

[0038] According to an embodiment of the present invention, preferably, matching the corresponding volume expansion coefficient according to the electrolyte type includes: A pre-established electrolyte parameter database is retrieved, wherein the database stores the volume expansion coefficient β values ​​and corresponding nonlinear fitting functions of different electrolyte models within a specific temperature range; wherein the database automatically matches the current electrolyte model by scanning the electrolyte packaging identification code.

[0039] It can achieve good volume expansion coefficient query, matching, and correspondence effects, thereby improving the calculation efficiency.

[0040] According to an embodiment of the present invention, preferably, matching the corresponding volume expansion coefficient according to the electrolyte type, and performing compensation calculation on the initial number of rotations in combination with the temperature difference to obtain the target number of rotations after current temperature compensation include: The volume expansion coefficient β of the electrolyte can be obtained by consulting the liquid volume expansion coefficient table, or it can be estimated using the following calculation formula: β≈δV / (V0*δT)); reflects the rate of volume change per unit temperature difference; Then, at the current temperature, using the injection pump to pump out the target weight of electrolyte, the actual volume should be: V1=V0*(1+β*δT); The number of revolutions that the injection pump needs to rotate at the current temperature can be obtained. The calculation formula is as follows: R1=R0*(1+β*δT).

[0041] According to an embodiment of the present invention, preferably, matching the corresponding volume expansion coefficient according to the electrolyte type, and performing compensation calculation on the initial number of rotations in combination with the temperature difference to obtain the target number of rotations after current temperature compensation further includes: When it is detected that the temperature difference exceeds a preset threshold, a nonlinear compensation model including a quadratic term is used to calculate the target number of rotations R1, where the coefficient of the quadratic term is 50% of the product of the square of the volume expansion coefficient β and the square of the temperature difference.

[0042] Specifically, the nonlinear compensation model is applicable under conditions such as |δT|>10℃.

[0043] Formula: R1=R0×[1+βδT+0.5(βδT)²] It is possible to introduce quadratic terms to correct high-order temperature effects (nonlinear characteristics of β changing with temperature).

[0044] Calculation in the embodiment: Assume β = 0.00087 / °C, δT = 20°C; linear model error: 0.00087 × 20 = 1.74%; nonlinear correction term: 0.5 × (0.00087 × 20)² = 0.015%; total compensation: 1.74% + 0.015% = 1.755%.

[0045] Step S105 : Controlling the injection pump to perform electrolyte injection operation according to the target number of rotations, so that electrolytes at different temperatures can be accurately injected.

[0046] It can achieve accurate determination of the operating effect, thereby achieving the effect of injecting precise electrolyte.

[0047] According to an embodiment of the present invention, preferably, after controlling the injection pump to perform electrolyte injection operation according to the target number of rotations so as to accurately inject electrolyte at different temperatures, the method further includes: a closed-loop correction step, The actual injection weight is weighed. If the deviation between the actual injection weight and the target weight exceeds the allowable error threshold, the volume expansion coefficient β is reversely corrected based on the weight deviation value, and the target number of rotations is recalculated to perform the refilling operation.

[0048] Specifically, the weighing module detects the actual weight M' (such as a Mettler weighing sensor with an accuracy of ±0.01g).

[0049] Error calculation: ΔM = |M-M'|, the threshold is set to max (0.1 g, 0.05%M).

[0050] Reverse correction β: β'=[(M' / (ρ0×V0))-1] / δT (ρ0 is the reference density). Dynamic calibration of β value is achieved to adapt to fluctuations in electrolyte formulation.

[0051] According to an embodiment of the present invention, preferably, the actual injection weight is weighed. If the deviation between the actual injection weight and the target weight exceeds the allowable error threshold, the volume expansion coefficient β is reversely corrected based on the weight deviation value, and the target number of rotations is recalculated to perform the refilling operation, including: During the first injection, the injection pump is controlled to output 90%-95% of the target weight, and the precise number of compensation turns required for the remaining injection volume is calculated based on the weighing result after the first injection.

[0052] Through the above scheme, the present application can determine the temperature change of the electrolyte under the condition of a fixed injection volume, thereby calculating the volume change of the required electrolyte, and then calculating the number of revolutions that the injection pump needs to rotate for this injection, thereby meeting the precise control of the battery injection weight under different temperature conditions.

[0053] From the above description, it can be seen that this application achieves the following technical effects: In an embodiment of the present application, an automatic correction method for the injection volume is adopted. At a preset reference temperature, an injection pump is used to output a target weight of electrolyte, and the reference volume corresponding to the target weight of electrolyte is measured; based on the single-turn output volume of the injection pump screw, the initial number of rotations for outputting the reference volume is determined; the current electrolyte temperature is obtained in real time and compared with the reference temperature to determine the temperature difference; the corresponding volume expansion coefficient is matched according to the electrolyte type, and the initial number of rotations is compensated and calculated in combination with the temperature difference to obtain the target number of rotations after current temperature compensation; the injection pump is controlled to perform electrolyte injection operation according to the target number of rotations, so that the electrolyte at different temperatures can be accurately injected, thereby achieving the purpose of accurately controlling the battery injection weight under different temperature conditions, thereby realizing the technical effect of improving the injection accuracy and battery performance, and further solving the technical problem that when the electrolyte temperature changes, the density of the electrolyte also changes accordingly, and the originally preset volume of the injection pump can no longer represent the original required injection weight, thereby reducing the performance of the battery.

[0054] This application also relates to another aspect, providing a lithium battery temperature sensing liquid injection control system. Figure 2 As shown, the lithium battery temperature sensing liquid injection control system includes: The reference volume measurement module 201 is configured to output a target weight of electrolyte using an injection pump at a preset reference temperature and measure a reference volume corresponding to the target weight of electrolyte; It can achieve the effect of obtaining the reference volume, thus providing a basis for subsequent calculations.

[0055] The module 202 for determining the initial number of rotations for outputting a reference volume is configured to determine the initial number of rotations for outputting a reference volume based on the output volume of the screw rod of the injection pump per rotation. A direct mapping relationship between mechanical movement and injection volume can be established.

[0056] The temperature difference acquisition and determination module 203 is used to obtain the current electrolyte temperature in real time and compare it with the reference temperature to determine the temperature difference; It can achieve real-time temperature collection effect, so as to determine the accurate temperature difference.

[0057] A calculation and compensation module 204 is configured to match a corresponding volume expansion coefficient according to the electrolyte type and perform compensation calculation on the initial number of rotations in combination with the temperature difference to obtain a target number of rotations after current temperature compensation; A good calculation compensation effect can be achieved, thereby obtaining an accurate target number of rotations.

[0058] The injection control module 205 is used to control the injection pump to perform electrolyte injection operation according to the target number of rotations, so that electrolytes at different temperatures can be accurately injected.

[0059] It can achieve accurate determination of the operating effect, thereby achieving the effect of injecting precise electrolyte.

[0060] The purpose of this application is to solve the problem of injection volume deviation caused by temperature difference during lithium battery injection, and to provide a method for sensing the temperature difference change of the electrolyte, deriving the volume change of the electrolyte under the corresponding weight, and adjusting the number of turns of the injection pump to achieve precise injection.

[0061] From the above description, it can be seen that this application achieves the following technical effects: In an embodiment of the present application, an automatic correction method for the injection volume is adopted. At a preset reference temperature, an injection pump is used to output a target weight of electrolyte, and the reference volume corresponding to the target weight of electrolyte is measured; based on the single-turn output volume of the injection pump screw, the initial number of rotations for outputting the reference volume is determined; the current electrolyte temperature is obtained in real time and compared with the reference temperature to determine the temperature difference; the corresponding volume expansion coefficient is matched according to the electrolyte type, and the initial number of rotations is compensated and calculated in combination with the temperature difference to obtain the target number of rotations after current temperature compensation; the injection pump is controlled to perform electrolyte injection operation according to the target number of rotations, so that the electrolyte at different temperatures can be accurately injected, thereby achieving the purpose of accurately controlling the battery injection weight under different temperature conditions, thereby realizing the technical effect of improving the injection accuracy and battery performance, and further solving the technical problem that when the electrolyte temperature changes, the density of the electrolyte also changes accordingly, and the originally preset volume of the injection pump can no longer represent the original required injection weight, thereby reducing the performance of the battery.

[0062] like Figure 3 As shown, electronic device 10 includes at least one processor 11 and memory, such as read-only memory (ROM) 12 and random access memory (RAM) 13, communicatively connected to at least one processor 11. The memory stores computer programs executable by the at least one processor. Processor 11 can perform various appropriate actions and processes based on the computer programs stored in ROM 12 or loaded from storage unit 18 into RAM 13. RAM 13 can also store various programs and data required for the operation of electronic device 10. Processor 11, ROM 12, and RAM 13 are interconnected via bus 14. An input / output (I / O) interface 15 is also connected to bus 14.

[0063] Multiple 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 via a computer network such as the Internet and / or various telecommunication networks.

[0064] The processor 11 can be any general-purpose and / or specialized processing component 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 specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any other suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the lithium battery temperature-sensing liquid injection control method.

[0065] In some embodiments, the lithium battery temperature-sensing liquid injection control method can 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 can 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 lithium battery temperature-sensing liquid injection control method described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the lithium battery temperature-sensing liquid injection control method in any other appropriate manner (for example, by means of firmware).

[0066] Various embodiments of the systems and techniques described above 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), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes 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.

[0067] 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, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0068] 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 conjunction with an instruction execution system, device, or apparatus. A computer-readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media may include an electrical connection based on one or more wires, 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.

[0069] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device that has: 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 pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the 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 input, voice input, or tactile input).

[0070] The systems and techniques described herein can 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 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 can be interconnected via any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include local area networks (LAs), wide area networks (WAs), blockchain networks, and the Internet.

[0071] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0072] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0073] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A lithium battery temperature-sensing liquid injection control method, characterized in that: include: At a preset reference temperature, use an injection pump to output a target weight of electrolyte, and measure the reference volume corresponding to the target weight of electrolyte; Based on the output volume of the injection pump screw per rotation, determine the initial number of rotations required to output the reference volume; Obtain the current electrolyte temperature in real time and compare it with the reference temperature to determine the temperature difference; Matching the volume expansion coefficient corresponding to the electrolyte type and calculating the compensation for the initial number of rotations in combination with the temperature difference to obtain a target number of rotations after current temperature compensation; The injection pump is controlled to perform electrolyte injection operation according to the target number of rotations, so that electrolytes at different temperatures can be accurately injected.

2. The lithium battery temperature sensing liquid injection control method according to claim 1, characterized in that: Based on the output volume per rotation of the injection pump screw, determine the initial number of rotations required to output the reference volume, including: At a preset reference temperature, the reference volume V0 is divided by the theoretical output volume V of a single turn of the screw to obtain the theoretical number of turns R0, which is then multiplied by the volumetric efficiency correction coefficient η; wherein the volumetric efficiency correction coefficient η is obtained through a multi-speed calibration test, and the calibration test includes: measuring the ratio of the actual output volume of the injection pump to the theoretical volume at at least three different speeds.

3. The lithium battery temperature sensing liquid injection control method according to claim 1, characterized in that: The volume expansion coefficient is matched to the electrolyte type, including: A pre-established electrolyte parameter database is retrieved, wherein the database stores the volume expansion coefficient β values ​​and corresponding nonlinear fitting functions of different electrolyte models within a specific temperature range; wherein the database automatically matches the current electrolyte model by scanning the electrolyte packaging identification code.

4. The lithium battery temperature-sensing liquid injection control method according to claim 1, characterized in that: According to the volume expansion coefficient corresponding to the electrolyte type, the initial number of rotations is compensated and calculated in combination with the temperature difference to obtain the target number of rotations after current temperature compensation, including: The volume expansion coefficient β of the electrolyte can be obtained by consulting the liquid volume expansion coefficient table, or it can be estimated using the following calculation formula: β≈δV / (V0*δT)); Then, at the current temperature, using the injection pump to pump out the target weight of electrolyte, the actual volume should be: V1=V0*(1+β*δT); The number of revolutions that the injection pump needs to rotate at the current temperature can be obtained. The calculation formula is as follows: R1=R0*(1+β*δT).

5. The lithium battery temperature sensing liquid injection control method according to claim 1, characterized in that: The method further includes: performing a compensation calculation on the initial number of rotations based on the volume expansion coefficient of the electrolyte type and the temperature difference to obtain a target number of rotations after current temperature compensation; When it is detected that the temperature difference exceeds a preset threshold, a nonlinear compensation model including a quadratic term is used to calculate the target number of rotations R1, where the coefficient of the quadratic term is 50% of the product of the square of the volume expansion coefficient β and the square of the temperature difference.

6. The lithium battery temperature-sensing liquid injection control method according to claim 5, characterized in that: After controlling the injection pump to perform electrolyte injection operation according to the target number of revolutions so as to accurately inject electrolyte at different temperatures, the method further includes: a closed-loop correction step, The actual injection weight is weighed. If the deviation between the actual injection weight and the target weight exceeds the allowable error threshold, the volume expansion coefficient β is reversely corrected based on the weight deviation value, and the target number of rotations is recalculated to perform the refilling operation.

7. The lithium battery temperature sensing liquid injection control method according to claim 6, characterized in that: Weigh the actual injection weight. If the deviation between the actual injection weight and the target weight exceeds the allowable error threshold, the volume expansion coefficient β is reversely corrected based on the weight deviation value, and the target number of rotations is recalculated to perform the refilling operation, including: During the first injection, the injection pump is controlled to output 90%-95% of the target weight, and the precise number of compensation turns required for the remaining injection volume is calculated based on the weighing result after the first injection.

8. Lithium battery temperature sensing injection control system, characterized in that: include: A reference volume measurement module is used to output a target weight of electrolyte using an injection pump at a preset reference temperature and measure a reference volume corresponding to the target weight of electrolyte; An initial rotation number determination module is used to determine the initial rotation number for outputting a reference volume based on the output volume of the screw rod of the injection pump per rotation; The module for collecting and determining the temperature difference is used to obtain the current electrolyte temperature in real time and compare it with the reference temperature to determine the temperature difference; a calculation and compensation module, configured to match a corresponding volume expansion coefficient according to the type of electrolyte, and perform compensation calculation on the initial number of rotations in combination with the temperature difference to obtain a target number of rotations after current temperature compensation; The liquid injection control module is used to control the liquid injection pump to perform electrolyte injection operation according to the target number of rotations, so that electrolyte at different temperatures can be accurately injected.

9. An electronic device, characterized in that The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, 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 the lithium battery temperature sensing injection control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, which are used to enable a processor to implement the lithium battery temperature-sensing liquid injection control method according to any one of claims 1 to 7 when executed.

Images