Liquid injection method and device for lithium battery to be injected with liquid, computer equipment and medium

Abstract

The invention discloses a liquid injection method and device for a to-be-injected lithium battery, computer equipment and a medium. The liquid injection method comprises the following steps: acquiring the rated capacity of a battery to be injected, the actual liquid injection port diameter and the actual liquid injection port number on a shell of the battery to be injected, and acquiring the set liquid injection amount of a liquid injection machine; the liquid injection time is calculated according to the rated capacity, the actual liquid injection opening diameter, the liquid injection opening number and a preset mathematical model; wherein the preset mathematical model comprises the corresponding relation between the liquid injection time and the rated capacity, the actual liquid injection port diameter and the liquid injection port number; the liquid injection rate is determined according to the liquid injection time and the set liquid injection amount; and injecting liquid into the to-be-injected lithium battery according to the liquid injection rate and the liquid injection time. According to the method, the liquid injection time is accurately calculated through the pre-established preset mathematical model among the rated capacity of the battery, the liquid injection port parameters and the liquid injection time, the method is simple and high in applicability, the consistency of the liquid injection amount of the battery can be ensured, the production efficiency is improved, expensive liquid injection equipment is not needed, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the field of lithium-ion battery technology, and in particular to a method, apparatus, computer equipment, and medium for injecting electrolyte into a lithium battery to be injected. Background Technology

[0002] In the production process of lithium-ion batteries, electrolyte injection is a crucial step. The injection speed, injection volume, and consistency directly affect key indicators such as cycle life, internal resistance, and safety performance of the battery. Currently, there are two main electrolyte injection processes commonly used in the industry: (1) Fixed-time injection method. This method involves setting a fixed injection time. This method is simple, but it cannot adapt to batteries with different capacities and different injection port designs. For large-capacity batteries, insufficient injection may occur; for small-capacity batteries, excessive injection may occur, leading to leakage or requiring a longer vacuuming time, thus reducing production efficiency. (2) Quantitative injection method. This method involves using a high-precision metering pump to control the volume of injected electrolyte. This method has high precision, but it has high equipment requirements, high cost, and complex equipment maintenance.

[0003] Both of the above-mentioned electrolyte injection methods have their advantages and disadvantages, but in practice, it is difficult to ensure that both methods are used simultaneously in the same batch of battery production. When the injection time is fixed, the amount of electrolyte injected becomes difficult to maintain. Similarly, when high-precision equipment is used to fix the injection volume each time, the injection time will vary, resulting in differences in the high-temperature settling time for the same batch of batteries.

[0004] In addition, the design of the injection port is usually determined based on experience. The design of the injection port includes, for example, the diameter and number of injection ports. This leads to repeated parameter adjustments during the liquid injection production process of lithium batteries, resulting in high trial and error costs and making it difficult to ensure the best consistency of liquid injection effect for different batches and models of battery products.

[0005] Therefore, there is an urgent need for a liquid filling method that is low-cost, simple to calculate, highly applicable, and can significantly improve the consistency and production efficiency of lithium battery liquid filling. Summary of the Invention

[0006] In view of this, this application aims to at least partially solve one of the problems in the related art. Therefore, the object of this application is to provide a method, apparatus, computer equipment, and medium for injecting electrolyte into a lithium-ion battery.

[0007] This application provides a method for injecting electrolyte into a lithium battery. The method includes: obtaining the rated capacity of the battery to be injected, the actual diameter and number of injection ports on the battery casing, and obtaining a set injection volume of the injection machine; calculating the injection time based on the rated capacity, the actual injection port diameter, the number of injection ports, and a preset mathematical model; wherein the preset mathematical model includes the correspondence between the injection time and the rated capacity, the actual injection port diameter, and the number of injection ports; determining the injection rate based on the injection time and the set injection volume; and injecting electrolyte into the lithium battery to be injected based on the injection rate and the injection time.

[0008] In some embodiments, the injection method further includes: determining the effective diameter of the injection port based on the actual injection port diameter; determining the compensation injection time based on the effective diameter of the injection port, the number of injection ports, and the rated capacity of the battery to be injected; calculating the injection time based on the effective diameter of the injection port, the number of injection ports, the rated capacity of the battery to be injected, and the compensation injection time, and constructing the preset mathematical model.

[0009] In some embodiments, determining the compensation injection time based on the effective diameter of the injection port, the number of injection ports, and the rated capacity of the battery to be injected includes: determining an initial injection time based on the effective diameter of the injection port, the number of injection ports, and the rated capacity of the battery to be injected; determining a test injection rate based on the initial injection time and the set injection volume of the injection machine; and, if the lithium battery to be injected is not fully filled after injection based on the test injection rate and the initial injection time, continuing to inject the lithium battery to be injected at the injection rate until the lithium battery to be injected is fully filled with electrolyte, and recording the compensation injection time.

[0010] In some embodiments, determining the effective diameter of the injection port based on the actual injection port diameter includes: determining the effective diameter of the injection port by subtracting a preset difference from the actual injection port diameter, wherein the preset difference ranges from [1.3 mm to 1.5 mm].

[0011] In some embodiments, the rated capacity of the battery to be injected is in the range of [80Ah, 120Ah], the actual diameter of the injection port on the casing of the battery to be injected is in the range of [2mm, 5mm], and the number of injection ports on the casing of the battery to be injected is one or more.

[0012] In some embodiments, the injection machine includes an injection pump, and the injection of the lithium battery to be injected with liquid according to the injection rate and the injection time includes: controlling the duration of the injection pump's operation to control the injection time, and injecting the lithium battery to be injected with liquid at the injection rate.

[0013] In some embodiments, injecting the lithium battery to be injected with liquid according to the injection rate and the injection time further includes: injecting liquid into multiple lithium batteries to be injected with liquid uniformly through multiple injection ports according to the injection rate and the injection time.

[0014] This application also provides a liquid injection device for a lithium battery to be injected with liquid. The liquid injection device includes: an acquisition module, a calculation module, a determination module, and an injection module. The acquisition module is used to acquire the rated capacity of the battery to be injected, the actual diameter and number of injection ports on the battery casing, and the set injection volume of the liquid injection machine; the calculation module is used to calculate the injection time based on the rated capacity, the actual injection port diameter, the number of injection ports, and a preset mathematical model, wherein the preset mathematical model includes the correspondence between the injection time and the rated capacity, the actual injection port diameter, and the number of injection ports; the determination module is used to determine the injection rate based on the injection time and the set injection volume; the injection module is used to inject liquid into the lithium battery to be injected with liquid according to the injection rate and the injection time.

[0015] This application also provides a computer device. The computer device includes a memory and a processor. The memory stores a computer program, which, when executed by the processor, implements the electrolyte injection method for the lithium battery to be injected as described in any of the above embodiments.

[0016] This application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program that, when executed by one or more processors, implements the electrolyte injection method for a lithium battery to be injected as described in any of the above embodiments.

[0017] Thus, the electrolyte injection method for lithium batteries in this application achieves rapid and accurate calculation of the injection time through a pre-established mathematical model relating the battery's rated capacity, injection port parameters, and injection time. This ensures consistency in the amount of electrolyte injected across different batches and models of batteries, improving battery production efficiency and overall product quality. Furthermore, the electrolyte injection method of this application eliminates the need for high-precision equipment, making it simple and widely applicable. It eliminates the need for expensive quantitative injection equipment, reducing equipment and maintenance costs, while also minimizing parameter adjustment time and trial-and-error costs before battery production, significantly improving production efficiency.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic flowchart of the liquid injection method for a lithium battery to be injected according to certain embodiments of this application; Figure 2 This is a schematic diagram of the liquid injection device for a lithium battery to be injected with liquid according to certain embodiments of this application; Figure 3 This is a schematic flowchart of the liquid injection method for a lithium battery to be injected according to certain embodiments of this application; Figure 4 This is a schematic diagram of the liquid injection device for a lithium battery to be injected with liquid according to certain embodiments of this application; Figure 5 This is a schematic flowchart of the liquid injection method for a lithium battery to be injected with liquid according to certain embodiments of this application. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly, referring to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or connections that allow communication between components; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0025] Please see Figure 1 This application provides a method for injecting electrolyte into a lithium battery. The method for injecting electrolyte into a lithium battery includes: 01: Obtain the rated capacity of the battery to be injected, the actual diameter and number of injection ports on the battery casing, and the set injection volume of the injection machine; 03: The injection time is calculated based on the rated capacity, actual injection port diameter, number of injection ports, and a preset mathematical model; the preset mathematical model includes the correspondence between the injection time and the rated capacity, actual injection port diameter, and number of injection ports. 05: Determine the injection rate based on the injection time and the set injection volume; 07: Inject the lithium battery to be injected according to the injection rate and injection time.

[0026] Please see Figure 2 This application also provides a liquid injection device 100 for a lithium battery to be injected with liquid. The liquid injection device 100 for a lithium battery to be injected with liquid includes: an acquisition module 10, a calculation module 30, a determination module 50, and an injection module 70.

[0027] Step 01 can be implemented by the acquisition module 10, step 03 by the calculation module 30, step 05 by the determination module 50, and step 07 by the liquid injection module 70. That is, the acquisition module 10 is used to acquire the rated capacity of the battery to be injected, the actual diameter and number of liquid injection ports on the battery casing, and the set liquid injection volume of the liquid injection machine; the calculation module 30 is used to calculate the liquid injection time based on the rated capacity, actual liquid injection port diameter, number of liquid injection ports, and a preset mathematical model, wherein the preset mathematical model includes the correspondence between the liquid injection time and the rated capacity, actual liquid injection port diameter, and number of liquid injection ports; the determination module 50 is used to determine the liquid injection rate based on the liquid injection time and the set liquid injection volume; and the liquid injection module 70 is used to inject liquid into the lithium battery to be injected based on the liquid injection rate and the liquid injection time.

[0028] Specifically, the values ​​of Q, d, x, and F input by the user via voice or handwriting can be obtained, thereby obtaining the rated capacity Q of the battery to be injected, the actual diameter d of the injection port on the battery casing and the number of injection ports x, and the set injection volume F of the injection machine.

[0029] The liquid injection machine described in this application can be a 0.6ppm isobaric liquid injection machine or other types of liquid injection machines, and there are no restrictions on this. For example, for a battery cell with a capacity of 100Ah, if the liquid injection coefficient is 3.0 g / Ah, then theoretically the set liquid injection volume of the liquid injection machine can be calculated as the product of 100 Ah and 3.0 g / Ah, that is, the set liquid injection volume of the liquid injection machine is 300 grams.

[0030] After obtaining the rated capacity Q of the battery to be injected, the actual diameter d of the injection port on the battery casing, the number of injection ports x, and the set injection volume F of the injection machine, the injection time t is calculated according to a preset mathematical model. The preset mathematical model includes the correspondence between the injection time t and the rated capacity Q, the actual injection port diameter d, and the number of injection ports x. The preset mathematical model can be a functional relationship as shown below: t = Q / [x * (d - 1.4)]+15.............Formula (1) In other words, this application establishes a precise mathematical model between the battery's rated capacity, injection port parameters, and injection time, thereby enabling rapid and accurate calculation of injection time, which improves battery production efficiency and battery consistency while ensuring injection effect.

[0031] In one example, a lithium battery with a rated capacity Q of 100Ah needs to be produced. To speed up the electrolyte filling process, the battery is designed with two filling ports, i.e., the number of filling ports x=2, and the actual filling port diameter d=3.0mm. According to formula (1), the electrolyte filling time t is calculated as: t = Q / [x * (d - 1.4)] +15 = 100 / [2 * (3.0 - 1.4)] +15 = 100 / (2 * 1.6) +15 = 100 / 3.2 +15 = 46.25 (min). Therefore, the calculated electrolyte filling time t is 46.25 min.

[0032] After determining the injection time, the injection rate can be determined using the formula: Injection Rate = Injection Volume / Injection Time. For example, if the set injection volume F of the injection machine is 300g and the injection time t is 46min, then the injection rate v is 6.52g / min.

[0033] After determining the injection rate and injection time, the lithium battery to be injected with electrolyte is then injected according to these parameters. For example, the electrolyte is injected into the lithium battery to be injected with an injection rate of 6.52 g / min and an injection time of 46 min, as described above. Experimental testing shows that the electrolyte injected using the method described in this application results in a sufficient amount of electrolyte with no excess electrolyte residue, demonstrating excellent injection performance.

[0034] In other words, this application uses a pre-set mathematical model to strongly correlate the injection time with the core parameters of the battery to be injected, scientifically determining the optimal injection time. This fundamentally ensures the consistency of the injection volume for different batches and models of batteries, improving the overall quality of battery products. The core parameters of the battery to be injected include the battery's rated capacity and the design parameters of the injection port. The injection method of this application can calculate the theoretical injection time based on the pre-set mathematical model, then determine the injection rate based on the injection time and the set injection volume of the injection machine. Subsequently, the lithium battery to be injected is injected according to the injection time and injection rate. For large-capacity batteries, this overcomes the problem of insufficient injection; for small-capacity batteries, it overcomes the problem of excessive injection, thereby improving the time consistency of battery manufacturing and increasing production efficiency.

[0035] Thus, the electrolyte injection method for lithium batteries in this application achieves rapid and accurate calculation of injection time through a pre-established mathematical model relating the battery's rated capacity, injection port parameters, and injection time. This ensures consistency in the amount of electrolyte injected across different batches and models of batteries, while guaranteeing the injection effect, thereby improving battery production efficiency and overall product quality. Furthermore, the electrolyte injection method of this application eliminates the need for high-precision equipment, simplifying the process and eliminating the need for expensive quantitative injection equipment. This reduces equipment and maintenance costs, while also minimizing parameter adjustment time and trial-and-error costs before battery production, significantly improving production efficiency.

[0036] Please see Figure 3 In some embodiments, the injection method further includes: 02: Determine the effective diameter of the injection port based on the actual injection port diameter; 04: Determine the compensation injection time based on the effective diameter of the injection port, the number of injection ports, and the rated capacity of the battery to be injected; 06: The injection time is calculated based on the effective diameter of the injection port, the number of injection ports, the rated capacity of the battery to be injected, and the compensation injection time, and a preset mathematical model is constructed.

[0037] Please see Figure 4 The electrolyte injection device 100 for the lithium battery to be injected in this application also includes a modeling module 20. Steps 02, 04, and 06 can be implemented by the modeling module 20. That is, the modeling module 20 is used to determine the effective diameter of the electrolyte injection port based on the actual diameter of the injection port; determine the compensation injection time based on the effective diameter of the injection port, the number of injection ports, and the rated capacity of the battery to be injected; calculate the injection time based on the effective diameter of the injection port, the number of injection ports, the rated capacity of the battery to be injected, and the compensation injection time, and construct a preset mathematical model.

[0038] Specifically, this application defines the concept of the effective diameter of the injection port, where the actual injection port diameter is d, and the effective diameter of the injection port is (d-1.4) mm in the above formula (1).

[0039] Understandably, a series of extensive experiments have revealed that due to the lower plastic layer and core pack beneath the electrolyte injection port, the electrolyte does not flow into the battery without resistance. In reality, factors such as surface tension and viscous resistance significantly impede the electrolyte injection process. That is to say, the previously understood method of multiplying the area of ​​the electrolyte injection port by the injection rate of the injection machine per unit time could directly yield the electrolyte throughput through that area per unit time. However, extensive experiments have shown that the actual effective diameter involved in the injection is not the physical diameter d, but rather an equivalent value 1.4 mm smaller than d.

[0040] In addition, since the effective diameter of the injection port is 1.4 mm smaller than the actual injection port diameter, the injection time in the preset mathematical model needs to be compensated for the original injection time, that is, the compensation injection time needs to be determined, so as to achieve a more accurate injection effect for lithium batteries.

[0041] Therefore, this application defines the concept of the effective diameter of the injection port, and determines the compensation injection time based on the effective diameter of the injection port, the number of injection ports and the rated capacity of the battery to be injected. Then, the injection time is calculated based on the effective diameter of the injection port and the compensation injection time, thereby constructing a preset mathematical model.

[0042] Please see Figure 5 In some implementations, step 04 includes: 041: Determine the initial injection time based on the effective diameter of the injection port, the number of injection ports, and the rated capacity of the battery to be injected; 042: Determine the test injection rate based on the initial injection time and the set injection volume of the injection machine; 043: If the lithium battery to be injected is not fully filled after the test injection rate and initial injection time, continue to inject the lithium battery to be injected at the injection rate until the lithium battery to be injected is fully filled with electrolyte, and record the compensation injection time.

[0043] Please combine Figure 4 Steps 041, 042, and 043 can be implemented by the modeling module 20. That is, the modeling module 20 is used to determine the initial injection time based on the effective diameter of the injection port, the number of injection ports, and the rated capacity of the battery to be injected; to determine the test injection rate based on the initial injection time and the set injection volume of the injection machine; and if the lithium battery to be injected is not fully filled after injection based on the test injection rate and the initial injection time, to continue injecting the lithium battery to be injected at the injection rate until the lithium battery to be injected is fully filled with electrolyte, and to record the compensation injection time.

[0044] Specifically, the initial injection time is determined based on the effective diameter of the injection port, the number of injection ports, and the rated capacity of the battery to be injected. For example, in one case, a lithium battery with a rated capacity Q of 100Ah needs to be produced. To speed up the injection process, the battery is designed with two injection ports, i.e., the number of injection ports x=2, the actual injection port diameter d=3.0mm, and the effective diameter of the injection port is d-1.4=1.6mm. According to formula (1), the injection time t = Q / [x * (d - 1.4)]= 100 / [2 * (3.0 -1.4)] = 100 / (2 * 1.6) = 100 / 3.2 = 31.25 (min). Therefore, the calculated initial injection time t0 is 31.25min.

[0045] After determining the initial injection time, the test injection rate is determined based on the initial injection time and the set injection volume of the injection machine. For example, if the initial injection time t0 is 31.25 min, the set injection volume F of the injection machine is 300 g, and the injection time t0 is 31.25 min, then the test injection rate v0 is 9.6 g / min.

[0046] Subsequently, if the lithium-ion battery to be injected is not fully filled after initial injection based on the test injection rate and initial injection time, the injection rate is continued until the battery is fully filled with electrolyte, and the compensation injection time is recorded. For example, if the lithium-ion battery to be injected is not fully filled after initial injection based on a test injection rate v0 of 9.6 g / min and an initial injection time t0 of 31.25 min, the injection rate v0 is continued until the battery is fully filled with electrolyte, and the compensation injection time t0 is recorded. 补 The time is 15 minutes. Similarly, after numerous experiments, it was found that the compensation injection time t in this application is... 补 It takes 15 minutes.

[0047] Thus, the liquid injection method for the lithium battery to be injected in this application can be determined through a large number of experiments to compensate for the liquid injection time, thereby constructing the preset mathematical model of this application.

[0048] In some implementations, step 02 includes: 021: Determine the effective diameter of the injection port by subtracting the preset difference from the actual injection port diameter. The preset difference ranges from 1.3mm to 1.5mm.

[0049] Step 021 can be implemented by the modeling module 20. That is, the modeling module 20 is used to determine the effective diameter of the injection port by subtracting a preset difference from the actual injection port diameter. The preset difference ranges from 1.3 mm to 1.5 mm.

[0050] Specifically, the preset difference is a value obtained through numerous experiments involving the injection of emulsion electrolyte. For example, the preset difference can be 1.3mm, 1.33mm, 1.34mm, 1.35mm, 1.38mm, 1.4mm, 1.41mm, 1.46mm, 1.48mm, or 1.5mm, without any restrictions. As shown in formula (1) above, the preset difference can be 1.4mm.

[0051] The effective diameter of the injection port is the actual diameter of the injection port on the casing of the battery to be injected minus a preset difference, thus obtaining the effective diameter of the injection port that is closest to the actual injection situation.

[0052] Thus, the effective diameter of the liquid injection port of the lithium battery to be injected in this application can be determined by subtracting a preset difference from the actual diameter of the liquid injection port, thereby constructing a corresponding preset mathematical model and achieving a more accurate liquid injection effect for the lithium battery.

[0053] In some embodiments, the rated capacity Q of the battery to be injected is in the range of [80Ah, 120Ah], the actual injection port diameter d on the battery casing is in the range of [2mm, 5mm], and the number of injection ports on the battery casing is one or more.

[0054] That is, the rated capacity Q of the battery to be filled with liquid in this application ranges from 80Ah to 120Ah. For example, the rated capacity Q of the battery to be filled with liquid can be 80Ah, 83Ah, 86Ah, 88Ah, 90Ah, 95Ah, 97Ah, 100Ah, 110Ah or 120Ah, and there is no limitation here.

[0055] The actual diameter d of the injection port on the casing of the battery to be injected can range from 2mm to 5mm. For example, the actual diameter d can be 2mm, 2.1mm, 2.2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 4.8mm or 5mm, and there is no restriction here.

[0056] The number of injection ports x on the casing of the battery to be injected can be 1, 2, 3 or other numbers, and there is no restriction here.

[0057] In other words, the batteries to be injected with electrolyte in this application cover the mainstream capacity range of 80-120Ah and the injection port size range of 2-5mm, making them suitable for the production of various models and sizes of lithium batteries. Users can flexibly select the injection port diameter d and the number of injection ports x according to design requirements, thereby quickly calculating the corresponding optimal injection time t based on a preset mathematical model. This fundamentally ensures the consistency of the electrolyte injection volume for different batches and models of batteries, improving the overall quality of battery products.

[0058] Thus, the liquid injection method for lithium batteries to be injected according to this application is applicable to the liquid injection production process of lithium batteries of various models or sizes, and has universal applicability and flexibility.

[0059] In some embodiments, the injection machine includes an injection pump, and step 07 includes: 071: Control the duration of the injection pump to control the injection time and inject the lithium battery to be injected at the injection rate.

[0060] Please combine Figure 2 Step 071 can be implemented by the liquid injection module 70. That is, the liquid injection module 70 is used to control the duration of the liquid injection pump to control the liquid injection time, and to inject the lithium battery to be injected with liquid at the liquid injection rate.

[0061] Specifically, as mentioned above, for a lithium battery with a rated capacity Q of 100Ah, in order to speed up the liquid injection process, the battery is designed with two liquid injection ports, that is, the number of liquid injection ports x is 2, and the diameter of the liquid injection port d = 3.0mm.

[0062] According to the above formula (1), the injection time t can be calculated as: t = Q / [x * (d - 1.4)] +15 = 100 / [2 * (3.0 - 1.4)] +15 = 100 / (2 * 1.6) +15 = 100 / 3.2 +15 = 46.25 minutes. Therefore, this application can control the injection time t by controlling the injection pump to be on for 46.25 minutes and then stopping.

[0063] Thus, the electrolyte injection method for the lithium-ion battery described in this application is simple, requiring no expensive quantitative injection equipment; high-precision injection can be achieved with just a common timing injection pump. This significantly reduces equipment and maintenance costs. Simultaneously, it reduces parameter debugging time and trial-and-error costs before production, significantly improving production efficiency.

[0064] In some implementations, step 07 further includes: 072: Based on the injection rate and injection time, multiple lithium batteries to be injected with electrolyte are injected uniformly through multiple injection ports.

[0065] Please combine Figure 2 Step 07 can be implemented by the liquid injection module 70. That is, the liquid injection module 70 is used to uniformly inject liquid into multiple lithium batteries to be injected through multiple injection ports according to the liquid injection rate and liquid injection time.

[0066] Specifically, the method of uniformly injecting multiple lithium batteries into a single batch of batteries using multiple injection ports according to the injection rate and injection time means that the injection method of the lithium batteries to be injected in this application can simultaneously control the uniform injection of multiple lithium batteries to be injected into the same batch of batteries, thereby improving battery production efficiency and battery consistency.

[0067] Thus, the liquid injection method for lithium batteries to be injected in this application can simultaneously inject the same batch of batteries at the same injection rate and injection time, thereby improving battery production efficiency and battery consistency.

[0068] This application also provides a computer device. The computer device includes a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, it implements the liquid injection method for the lithium battery to be injected as described in any of the above embodiments.

[0069] Specifically, the details of the liquid injection method for the lithium battery to be injected are as described above and will not be repeated here.

[0070] The computer equipment described in this application utilizes the aforementioned liquid injection method for lithium batteries to be injected with electrolyte. Through a pre-established, precise mathematical model relating the battery's rated capacity, injection port parameters, and injection time, it achieves rapid and accurate calculation of the injection time. This ensures consistency in the amount of electrolyte injected across different batches and models of batteries, while guaranteeing the injection effect, thereby improving battery production efficiency and the overall quality of battery products. Furthermore, the liquid injection method for lithium batteries to be injected with electrolyte in this application does not require high-precision equipment. The method is simple and highly applicable, eliminating the need for expensive quantitative injection equipment, thus reducing equipment and maintenance costs. It also reduces parameter debugging time and trial-and-error costs before production, significantly improving production efficiency.

[0071] This application provides a computer-readable storage medium. The computer-readable storage medium stores a computer program that, when executed by one or more processors, implements the electrolyte injection method for a lithium battery as described in any of the above embodiments.

[0072] Specifically, the details of the liquid injection method for the lithium battery to be injected are as described above and will not be repeated here.

[0073] The computer-readable storage medium of this application utilizes the aforementioned liquid injection method for lithium batteries to be injected with electrolyte. Through a pre-established, precise mathematical model relating the battery's rated capacity, injection port parameters, and injection time, it achieves rapid and accurate calculation of the injection time. This ensures consistency in the amount of electrolyte injected across different batches and models of batteries, while guaranteeing the injection effect, thereby improving battery production efficiency and overall product quality. Furthermore, the liquid injection method of this application for lithium batteries does not require high-precision equipment. The method is simple and highly applicable, eliminating the need for expensive quantitative injection equipment, thus reducing equipment and maintenance costs. It also reduces parameter debugging time and trial-and-error costs before production, significantly improving production efficiency.

[0074] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for injecting electrolyte into a lithium battery, characterized in that, The injection method includes: The rated capacity of the battery to be injected, the actual diameter and number of injection ports on the casing of the battery to be injected, and the set injection volume of the injection machine are obtained. The injection time is calculated based on the rated capacity, the actual injection port diameter, the number of injection ports, and a preset mathematical model; wherein, the preset mathematical model includes the correspondence between the injection time and the rated capacity, the actual injection port diameter, and the number of injection ports; The injection rate is determined based on the injection time and the set injection volume; The lithium battery to be injected is injected according to the injection rate and the injection time.

2. The injection method according to claim 1, characterized in that, The injection method further includes: The effective diameter of the injection port is determined based on the actual injection port diameter. The compensation injection time is determined based on the effective diameter of the injection port, the number of injection ports, and the rated capacity of the battery to be injected. The injection time is calculated based on the effective diameter of the injection port, the number of injection ports, the rated capacity of the battery to be injected, and the compensation injection time, and the preset mathematical model is constructed.

3. The injection method according to claim 2, characterized in that, The step of determining the compensation injection time based on the effective diameter of the injection port, the number of injection ports, and the rated capacity of the battery to be injected includes: The initial injection time is determined based on the effective diameter of the injection port, the number of injection ports, and the rated capacity of the battery to be injected. The test injection rate is determined based on the initial injection time and the set injection volume of the injection machine; If the lithium battery to be injected with electrolyte is not fully filled after the initial injection based on the test injection rate and the initial injection time, the injection rate is continued until the lithium battery is fully filled with electrolyte, and the compensation injection time is recorded.

4. The injection method according to claim 2, characterized in that, Determining the effective diameter of the injection port based on the actual injection port diameter includes: The effective diameter of the injection port is determined by subtracting a preset difference from the actual injection port diameter. The preset difference ranges from 1.3 mm to 1.5 mm.

5. The injection method according to claim 1, characterized in that, The rated capacity of the battery to be injected is in the range of [80Ah, 120Ah], the actual diameter of the injection port on the casing of the battery to be injected is in the range of [2mm, 5mm], and the number of injection ports on the casing of the battery to be injected is one or more.

6. The injection method according to claim 1, characterized in that, The liquid injection machine includes a liquid injection pump, and the step of injecting liquid into the lithium battery to be injected according to the liquid injection rate and the liquid injection time includes: The injection time is controlled by controlling the duration of the injection pump's operation, and the lithium battery to be injected is injected at the injection rate.

7. The injection method according to claim 1, characterized in that, The step of injecting the lithium battery to be injected with electrolyte according to the injection rate and the injection time further includes: According to the injection rate and the injection time, multiple injection ports are used to uniformly inject liquid into multiple lithium batteries to be injected.

8. A liquid injection device for a lithium battery to be injected with liquid, characterized in that, include: The acquisition module is used to acquire the rated capacity of the battery to be injected, the actual diameter and number of injection ports on the casing of the battery to be injected, and the set injection volume of the injection machine. The calculation module is used to calculate the injection time based on the rated capacity, the actual injection port diameter, the number of injection ports, and a preset mathematical model, wherein the preset mathematical model includes the correspondence between the injection time and the rated capacity, the actual injection port diameter, and the number of injection ports; The determining module is used to determine the injection rate based on the injection time and the set injection volume; and The liquid injection module is used to inject liquid into the lithium battery to be injected according to the liquid injection rate and the liquid injection time.

9. A computer device, characterized in that, The computer device includes a memory and a processor. The memory stores a computer program, which, when executed by the processor, implements the liquid injection method for the lithium battery to be injected according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by one or more processors, implements the liquid injection method for the lithium battery to be injected according to any one of claims 1-7.

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