Integrated negative pressure module

Abstract

The invention relates to an integrated negative pressure module which comprises a shell provided with a negative pressure cavity, and one side of the shell is provided with a negative pressure connector; the distances between the multiple negative pressure cup suction rods arranged in the first direction and the negative pressure connector are different; the confluence plate is provided with a confluence flow channel, a main flow channel of the confluence flow channel is communicated with the negative pressure interface, and a plurality of branch flow channels of the confluence flow channel are respectively communicated with the plurality of negative pressure cup suction rods; a confluence opening is formed in the position, communicated with the negative pressure cup suction rods, of the branch flow channel of the confluence flow channel, the aperture of the confluence opening is gradually decreased from far to near in the first direction, and when the negative pressure connector generates negative pressure, the vacuum values of the multiple negative pressure cup suction rods are consistent. According to the integrated negative pressure module provided by the invention, even if the distances between the negative pressure cup suction rods and the negative pressure interfaces are different, the negative pressure cup suction rods and the negative pressure interfaces can keep the same vacuum value during working, so that the consistency of vacuum adsorption of different batteries in the same battery module during battery formation is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of battery formation, and in particular to an integrated negative pressure module. Background Art

[0002] The negative pressure cup is a very important auxiliary tool in the battery manufacturing process, especially in the battery formation (i.e. the process of charging the battery for the first time), the electrochemical reaction will produce gas, if these gases cannot be effectively discharged, it may cause the internal pressure of the battery to increase, affecting the safety and performance of the battery; the negative pressure cup can create a slight negative pressure environment, which helps to discharge the generated gas in time and keep the pressure inside the battery stable. In addition, in some types of batteries, such as lithium-ion batteries, the amount and distribution of electrolyte have a direct impact on battery performance; the design of the negative pressure cup can help optimize the distribution of the electrolyte, ensuring that all parts of the battery can fully contact the electrolyte, thereby improving the consistency and cycle life of the battery.

[0003] The negative pressure cup usually includes a liquid inlet pipe, an air outlet pipe and a negative pressure cup body with a accommodating chamber for accommodating electrolyte. During operation, the liquid inlet pipe is coordinated with the suction nozzle to align with the liquid injection hole of the battery, and then the gas in the accommodating chamber of the negative pressure cup body is sucked out by a negative pressure pump. While sucking out the gas generated during the formation process, the electrolyte is sucked into the accommodating chamber and temporarily stored in the accommodating chamber. When all the gas is emptied, it is injected into the battery to ensure that all parts of the battery can fully contact the electrolyte.

[0004] Since the existing negative pressure chamber assembly is composed of multiple negative pressure cups, negative pressure pipelines, confluence pipelines and structural parts, the production process is relatively complicated, the labor consumption is large, the product quality control is difficult, and the production cost of the product is high.

[0005] In order to solve this problem, the prior art: Publication No.: CN221057491U, Invention Name: A Chinese utility model patent with an integrated negative pressure cup and an integrated negative pressure cavity discloses an integrated negative pressure cup, which uses one-piece molding technology to integrate multiple negative pressure cup bodies into a negative pressure cavity body to form an integral component, which can reduce processing costs and is more convenient to process and assemble; the confluence pipeline can be placed inside the negative pressure cavity, saving the use of negative pressure hoses and reducing the probability of air leakage. The entire cavity assembly extracts liquid through the internal pipeline, thereby greatly improving the overall product quality of the negative pressure cavity.

[0006] However, when the above-mentioned integrated negative pressure cup is actually used, since the negative pressure connector is arranged on one side of the entire cavity, the vacuum degree in the negative pressure cup body at different distances from the negative pressure connector is inconsistent. This uneven vacuum degree may cause problems of insufficient or excessive adsorption force, affecting the accuracy and reliability of the operation. During battery formation, it leads to inconsistent vacuum adsorption in different batteries in the battery module, resulting in inconsistent life and performance of different batteries in the battery module, affecting the use of the entire battery module. Summary of the invention

[0007] To this end, the technical problem to be solved by the present invention is to overcome the problem of uneven vacuum degree of the integrated negative pressure cup in the prior art, and to provide an integrated negative pressure module. Even if the distances between the suction rods of each negative pressure cup and the negative pressure interface are different, they can maintain the same vacuum value during operation, thereby ensuring the consistency of vacuum adsorption of different batteries in the same battery module during battery formation.

[0008] In order to solve the above technical problems, the present invention provides an integrated negative pressure module, comprising: A shell having a negative pressure chamber therein, a negative pressure interface being provided on one side of the shell, the negative pressure interface being in communication with the negative pressure chamber; A plurality of negative pressure cup suction rods, wherein the negative pressure cup suction rods are connected to the negative pressure chamber, and the distances between the plurality of negative pressure cup suction rods arranged along the first direction and the negative pressure interface are different; A confluence plate is arranged in the negative pressure chamber, and a confluence channel is opened in the confluence plate, and the confluence channel has a main channel and multiple branch channels, the main channel of the confluence channel is connected to the negative pressure interface, and the multiple branch channels of the confluence channel are respectively connected to the multiple negative pressure cup suction rods; Among them: on the confluence plate, a confluence port is opened at the connecting position between the branch channel of the confluence flow channel and the negative pressure cup suction rod, and the diameter of the confluence port gradually decreases from far to near along the first direction with the distance from the negative pressure interface, so that when negative pressure is generated at the negative pressure interface, the vacuum values ​​of multiple negative pressure cup suction rods are made consistent.

[0009] In one embodiment of the present invention, the caliber of the confluence port is determined by a simulation method, and the simulation steps include: Construct a three-dimensional geometric model of an integrated negative pressure module, including: a shell, a negative pressure chamber, a negative pressure cup suction rod, a manifold, and a confluence flow channel, and simulate the location of the negative pressure interface setting and the size of the initial confluence port on the manifold; Importing the three-dimensional geometric model into the CFD simulation model, wherein: the CFD simulation model uses the negative pressure interface as the pressure inlet, specifies the required negative pressure value, and uses multiple confluence ports as the pressure outlet, which is set to the ambient pressure; The diameter of the confluence port is taken as the design variable, and an input parameter is created for the diameter of each confluence port. The objective function is to minimize the negative pressure value at each confluence port, and the diameter of each confluence port is adjusted to obtain a CFD simulation model.

[0010] In one embodiment of the present invention, minimizing the negative pressure value at each confluence port is used as the objective function, and the caliber of each confluence port is adjusted by the gradient descent method to obtain the CFD simulation model, including the following steps: A monitoring point is set at each negative pressure cup suction rod to measure and predict the vacuum degree; Set the initial confluence port diameter to D0; In each simulation calculation cycle, the current confluence diameter D is used. i Perform CFD simulation to calculate the predicted value for each monitoring point Pd , CFD ; Define the objective function f( D ) is the maximum difference in vacuum degree between the monitoring points: f( D )=max(∣ Pd , CFD ,1− Pd , CFD ,2∣,∣ Pd , CFD ,1− Pd , CFD ,3∣,…); Calculate the objective function f( D ) The gradient of ▽f( Di ): ; in, δk is a small perturbation used to approximate the gradient; Update the diameter of each confluence according to the direction and magnitude of the gradient: ; in: Di , k is the current caliber of the kth confluence; Di +1, k is the updated caliber of the kth confluence; η is the learning rate, which is used to control the adjustment step size.

[0011] In one embodiment of the present invention, the diameter of the updated confluence port is used Di +1 Re-run the CFD simulation to get new predictions Pd , CFD, calculate the new target f( Di +1), and set a preset threshold ε to determine the stop condition: If the objective function value f( Di +1) is less than the preset threshold ε, or the gradient is close to zero, the adjustment is stopped to obtain the final CFD simulation model; otherwise, the caliber of the confluence port is continuously updated iteratively until the stop condition is met.

[0012] In one embodiment of the present invention, the caliber of the confluence port that meets the stop condition is used. Di +1Re-run CFD simulation and use visualization tools to check the vacuum distribution under each confluence diameter.

[0013] In one embodiment of the present invention, the diameter of the confluence port is used as a design variable, an input parameter is created for the diameter of each confluence port, and the maximum value and the minimum value of the input parameter are determined.

[0014] In one embodiment of the present invention, the shell is provided with an opening, and a cover plate and a sealing plate matched with the shell are provided at the opening.

[0015] In one embodiment of the present invention, it also includes: a negative pressure suction nozzle sleeved on the end of the negative pressure cup suction rod, the negative pressure suction nozzle can be inserted into the liquid filling port of the battery, and the negative pressure suction nozzle is used to seal the liquid filling port.

[0016] In one embodiment of the present invention, the negative pressure suction nozzle is an air bag type suction nozzle. Before inflation, the outer diameter of the negative pressure suction nozzle is smaller than the liquid injection port and can be inserted into the liquid injection port. After inflation, the negative pressure suction nozzle presents an "I"-shaped structure, including a neck and abutment portions arranged on both sides of the neck. The neck is arranged in the liquid injection port, and the two abutment portions are respectively arranged on both sides of the liquid injection port, and are respectively abutted and sealed with the inner wall and outer wall of the liquid injection port.

[0017] In one embodiment of the present invention, it further comprises: a mounting frame, the mounting frame comprising: A top plate, arranged above the shell and connected to the shell, the top plate being used to connect to an external driving component; A vertical plate, one end of which is connected to the top plate, and the vertical plate avoids the shell and extends toward the shell; The bottom plate is connected to the vertical plate through an elastic member. A through hole is provided on the bottom plate for the negative pressure cup suction rod to pass through. The bottom plate can abut against the battery module, and the end of the negative pressure cup suction rod is inserted into the liquid filling port of the battery by compressing the elastic member.

[0018] The above technical solution of the present invention has the following advantages compared with the prior art: The integrated negative pressure module described in the present invention is provided with a shell and multiple negative pressure cup suction rods to form an integrated negative pressure cup structure, and a confluence plate is provided to divert the negative pressure, so that each negative pressure cup suction rod can generate a certain negative pressure adsorption force, and in order to ensure the consistency of the negative pressure adsorption force in the negative pressure cup suction rod, the diameter of the confluence port is set to gradually decrease from far to near along the first direction with the distance from the negative pressure interface, that is: the farther the confluence port is from the negative pressure interface, the larger the diameter, and vice versa; in this way, even if the distances between the suction rods and the interface are different, the fluid resistances they withstand will tend to be consistent, which can avoid the common problem of uneven vacuum in traditional integrated negative pressure cups, and ensure that each negative pressure cup suction rod can reach the expected vacuum level when working. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein: Figure 1 It is a schematic diagram of the overall structure of the integrated negative pressure cup of the present invention; Figure 2 It is a schematic diagram of the explosion structure of the integrated negative pressure cup of the present invention; Figure 3 is a schematic structural diagram of a busbar of the present invention; Figure 4 It is a velocity cloud diagram obtained by using a visualization tool after CFD simulation of the present invention; Figure 5 It is a velocity streamline diagram obtained by using a visualization tool after CFD simulation of the present invention; Figure 6 It is a cross-sectional velocity vector diagram obtained by using a visualization tool after CFD simulation of the present invention; Figure 7 It is the velocity vector diagram at the outlet obtained by using a visualization tool after CFD simulation of the present invention; Figure 8 It is a schematic structural diagram of the negative pressure suction nozzle of the present invention when in use.

[0020] Explanation of the markings in the drawings in the specification: 1. Shell; 101. Negative pressure chamber; 102. Negative pressure interface; 2. Negative pressure cup suction rod; 3. Confluence plate; 301. Confluence channel; 302. Confluence port; 4. Negative pressure suction nozzle; 401. Neck; 402. Abutment portion; 5. Cover plate; 6. Sealing plate; 7. Top plate; 8. Vertical plate; 9. Bottom plate; 10. Elastic member. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0022] As mentioned above, the prior art publication number: CN221057491U, invention name: A Chinese utility model patent for a negative pressure cup integrated with an integrated negative pressure cavity is exactly a prior product produced by our company. When actually used, this product can indeed achieve the purpose of saving the use of negative pressure hoses, reducing the probability of air leakage, and greatly improving the overall product quality of the negative pressure cavity. However, after long-term use, certain problems have also been found, namely: when the battery is formed, the vacuum adsorption in different batteries in the battery module is inconsistent, resulting in inconsistent life and performance of different batteries in the battery module, affecting the use of the entire battery module; the cause of this problem is analyzed as follows: because the negative pressure connector is set on one side of the entire cavity, the vacuum degree in the negative pressure cup body at different distances from the negative pressure connector is inconsistent, and this uneven vacuum degree may cause insufficient or excessive adsorption force, affecting the accuracy and reliability of the operation.

[0023] Analyze the above problem: In fluid mechanics, the fluid resistance in the pipe is closely related to the length and diameter of the pipe. According to the Hagen-Poiseuille equation, for a fluid in a laminar flow state, the flow rate Q is proportional to the fourth power of the pipe radius r, that is, Q∝r 4 , which means that when the diameter of the pipe increases, the resistance of the fluid passing through the pipe will be significantly reduced, making it easier for the fluid to flow.

[0024] Since the distances between each negative pressure cup suction rod and the negative pressure interface are different, if the calibers of all the confluence ports are the same, the negative pressure cup suction rod at a farther distance needs to overcome a greater fluid resistance, resulting in a lower vacuum degree than the suction rod at a closer distance; in order to balance this difference, the inventor has come up with a method of gradual caliber change: that is, under the same negative pressure environment, if the negative pressure value at a position far from the negative pressure interface is small, then the caliber of the confluence port far from the negative pressure interface is increased accordingly; similarly, if the negative pressure value at a position close to the negative pressure interface is large, then the caliber of the confluence port close to the negative pressure interface is reduced accordingly, thereby ensuring that each negative pressure cup suction rod can obtain the same vacuum value.

[0025] Based on the above analysis, the inventor of the present invention modified the existing integrated negative pressure cup. Figure 1 and Figure 2As shown, the present invention discloses an integrated negative pressure module, comprising: a shell 1, a plurality of negative pressure cup suction rods 2 and a confluence plate 3; wherein: the shell 1 has a negative pressure chamber 101, and a negative pressure interface 102 is arranged on one side of the shell 1, the negative pressure interface 102 is connected to the negative pressure chamber 101, and a converter can be arranged at the negative pressure interface 102 to connect to an external negative pressure pump, and the negative pressure pump can realize vacuum adsorption; a plurality of the negative pressure cup suction rods 2 are connected to the negative pressure chamber 101, and a plurality of the negative pressure cup suction rods 2 are distributed on the bottom plane of the shell 1, and a plurality of the negative pressure cup suction rods 2 are distributed in a rectangular array along a first direction and a second direction, so that there are a plurality of negative pressure cup suction rods 2 arranged along the first direction and have different distances from the negative pressure interface 102; the confluence plate 3 is arranged in the negative pressure chamber 101, referring to Figure 3 As shown, a confluence channel 301 is provided in the confluence plate 3, and the confluence channel 301 has a main channel and multiple branch channels. The main channel of the confluence channel 301 is connected to the negative pressure interface 102, and the multiple branch channels of the confluence channel 301 are respectively connected to multiple negative pressure cup suction rods 2; on the confluence plate 3, a confluence port 302 is provided at the connection position between the branch channel of the confluence channel 301 and the negative pressure cup suction rod 2. According to the above analysis, in order to make each negative pressure cup suction rod 2 In order to obtain the same vacuum value, the diameter of the confluence port 302 gradually decreases along the first direction with the distance from the negative pressure interface 102 from far to near, that is, the farther the confluence port 302 is from the negative pressure interface 102, the larger the diameter, and vice versa; in this way, even if the distances between each suction rod and the interface are different, the fluid resistance they withstand will tend to be consistent, which can avoid the common problem of uneven vacuum in traditional integrated negative pressure cups, and ensure that each negative pressure cup suction rod 2 can achieve the expected vacuum level when working.

[0026] It should be noted that, in this embodiment, the core goal of the gradient aperture design is to achieve consistency in multi-point negative pressure. In this way, the common problem of uneven vacuum in traditional integrated negative pressure cups can be avoided, ensuring that each negative pressure cup suction rod 2 can reach the expected vacuum level when working; this is especially important for application scenarios that require precise control of adsorption force, for example: during the lithium battery formation process, any fluctuation in vacuum may lead to a decline in product quality.

[0027] Moreover, by adopting the above-mentioned technical scheme, the response speed of the whole system is significantly improved because the fluid resistance is effectively balanced; when the negative pressure is started, all the negative pressure cup suction rods 2 reach a stable vacuum state almost at the same time, which reduces the waiting time and improves the work efficiency; this is especially critical for the battery formation production line, which can shorten the production cycle and increase the output.

[0028] Specifically, in this embodiment, in order to ensure that the vacuum level of each negative pressure cup suction rod 2 is consistent, it is necessary to accurately control the diameter of the confluence port 302. Through the above analysis, it can be seen that although a method of gradual diameter has been obtained: that is, under the same negative pressure environment, the negative pressure value at a position far from the negative pressure interface 102 is small, then the diameter of the confluence port 302 far from the negative pressure interface 102 is increased accordingly. Similarly, the negative pressure value at a position close to the negative pressure interface 102 is large, then the diameter of the confluence port 302 close to the negative pressure interface 102 is reduced accordingly. However, due to the complexity of fluid mechanics, it is difficult to determine the actual diameter of the confluence port 302 during actual implementation, and it is necessary to rely on the manufacture and testing of physical prototypes, which is not only time-consuming and labor-intensive, but also costly.

[0029] In order to solve this problem, the present invention provides a simulation method to determine the diameter of the confluence port 302. Specifically, the simulation steps include: A three-dimensional geometric model of an integrated negative pressure module is constructed, including: a shell 1, a negative pressure chamber 101, a negative pressure cup suction rod 2, a confluence plate 3 and a confluence channel 301, to simulate the position of the negative pressure interface 102 and the size of the initial confluence port 302 on the confluence plate 3; the connection relationship and position relationship of each component are determined according to the actual proportion, and the position and initial caliber size of the confluence port 302 are accurately simulated.

[0030] Import the three-dimensional geometric model into the CFD simulation model (CFD: Computational Fluid Dynamics, CFD simulation model is a mathematical model used to predict the flow behavior of fluids (such as gas or liquid). These models use numerical methods to solve the basic physical laws that describe fluid motion, such as conservation of mass, conservation of momentum, and conservation of energy, etc.), set global and local grid size control, where: mesh refinement is performed in key areas such as the negative pressure cup suction rod 2, the negative pressure interface 102, and the connection to improve the simulation accuracy. Assuming that the working medium is air, the physical parameters such as the density and viscosity of the air are input, the materials of the shell 1, the negative pressure chamber 101, the negative pressure cup suction rod 2, and the manifold 3 are determined, and the material properties of these components (such as elastic modulus, Poisson's ratio, etc.) are input, and set to a no-slip wall condition, that is, the velocity of the fluid on the wall is zero; Negative pressure is set as a boundary condition, wherein: the CFD simulation model uses the negative pressure interface 102 as the pressure inlet, specifies the required negative pressure value, which is the negative pressure actually provided by the negative pressure pump, uses multiple confluence ports 302 as pressure outlets, and is set to ambient pressure, which is set to atmospheric pressure (0 Pa) to simulate the ambient pressure at the nozzle.

[0031] Taking the diameter of the confluence ports 302 as a design variable, creating an input parameter for the diameter of each confluence port 302, minimizing the negative pressure value at each confluence port 302 as an objective function, adjusting the diameter of each confluence port 302, and obtaining a CFD simulation model; Specifically, the diameter of the confluence port 302 is used as a design variable, an input parameter is created for the diameter of each confluence port 302, and the maximum and minimum values ​​of the input parameters are determined, which can avoid the design variables from exceeding the actual manufacturing and operation limitations, wherein: when determining the maximum value, the actual size of the negative pressure cup suction rod 2 must be taken into account, the maximum diameter of the confluence port 302 cannot exceed the diameter of the connection between the negative pressure cup suction rod 2 and the shell 1, and when determining the minimum value, the flow resistance problem must be taken into account. A confluence port 302 that is too small will increase the flow resistance, which may result in insufficient vacuum or excessive system pressure loss.

[0032] In this embodiment, CFD simulation can be used to quickly generate multiple design solutions on a computer and conduct detailed performance evaluations without actually building and testing each prototype. For this solution, CFD simulation can accurately simulate the diameter of each confluence port 302, reducing the number of unnecessary physical prototypes and the number of tests.

[0033] Specifically, when performing CFD simulation, when the number of negative pressure cup suction rods 2 is small, a negative pressure value standard can be determined by manually adjusting the diameter of each confluence 302, and the negative pressure values ​​in all negative pressure cup suction rods 2 can reach this standard by adjusting the diameter of the confluence 302; however, manual adjustment has certain defects. If the number of negative pressure cup suction rods 2 is large, it is difficult to adjust them all to a stable negative pressure value, and manual adjustment cannot perform linkage adjustment of multiple confluences 302. When the diameter of a confluence 302 changes, the negative pressure of the entire fluid space will fluctuate accordingly. During the adjustment process, it is very likely that when adjusting the diameter of a certain confluence 302, the pressure values ​​at other confluences 302 will change, and it is difficult to adjust to a balanced state by manual adjustment.

[0034] In order to solve this problem, the present invention provides a method of minimizing the negative pressure value at each confluence port 302 as an objective function, adjusting the diameter of each confluence port 302 by a gradient descent method, and obtaining a CFD simulation model, including the following steps: A monitoring point is set at each negative pressure cup suction rod 2 to measure and predict the vacuum degree; The diameter of the initial confluence port 302 is set to D0; In each simulation calculation cycle, the current diameter D of the confluence port 302 is used. i Perform CFD simulation to calculate the predicted value for each monitoring point Pd , CFD ; Define the objective function f( D ) is the maximum difference in vacuum degree between the monitoring points: f( D )=max(∣ Pd , CFD ,1− Pd , CFD ,2∣,∣ Pd , CFD ,1− Pd , CFD ,3∣,…); Calculate the objective function f( D ) The gradient of ▽f( Di ): ; in, δk is a small perturbation used to approximate the gradient; Update the diameter of each confluence port 302 according to the direction and magnitude of the gradient: ; in: Di , k is the current caliber of the kth confluence port 302; Di +1, k is the updated diameter of the kth confluence port 302; η is the learning rate, which is used to control the adjustment step size.

[0035] Specifically, in this embodiment, the gradient descent method is used to optimize the diameter of the confluence port 302. By calculating the gradient of the objective function, the parameters are gradually adjusted in the opposite direction of the gradient, so as to quickly find the optimal solution. In the negative pressure module, there may be multiple confluence ports 302 that need to be optimized simultaneously. The gradient descent method can accelerate the optimization process by calculating the gradient in parallel. It is suitable for complex multivariable problems. Compared with methods based on experimental design (such as response surface method), the gradient descent method does not need to generate a large number of initial design points, which reduces the total number of simulations and reduces the computational cost.

[0036] Furthermore, in the negative pressure module, the diameter of the confluence port 302 is usually a continuous variable, and the gradient descent method can be directly applied to such problems without discretization processing; Specifically, in the negative pressure module, the flow characteristics are usually nonlinear, and the gradient descent method can effectively handle this nonlinear relationship and find the optimal caliber setting of the confluence port 302 .

[0037] In this embodiment, since the flow characteristics of the gas are very difficult to control, when determining the diameter of the confluence port 302, the negative pressure value of each negative pressure cup suction rod 2 can be allowed to fluctuate within the allowed range. Di +1 Re-run the CFD simulation to get new predictions Pd , CFD , calculate the new target f( Di +1), and set a preset threshold ε to determine the stop condition: If the objective function value f( Di +1) is less than the preset threshold ε, or the gradient is close to zero, the adjustment is stopped to obtain the final CFD simulation model; otherwise, the caliber of the confluence port 302 is continuously updated iteratively until the stop condition is met.

[0038] By setting reasonable stopping conditions, the iteration can be terminated in time after achieving satisfactory results, avoiding unnecessary repeated simulations, reducing the total computing time and resource consumption. At the same time, it can also prevent excessive iterations and ensure that the algorithm converges to satisfactory results within a limited number of iterations.

[0039] Specifically, the diameter of the confluence port 302 that satisfies the stop condition is used. Di +1Re-run CFD simulation and use visualization tools to check the vacuum distribution of each confluence port under the 302 diameter. Figure 4 and Figure 5 As shown, in the present embodiment, 8 negative pressure cup suction rods 2 are provided, which are numbered 1, 2...7, 8 from left to right, and a negative pressure interface 102 is provided on the right side. A negative pressure of -80 kPa is provided at the position of the negative pressure interface 102. The negative pressure cup suction rod 2 is used to extract air and electrolyte. Through the above-mentioned CFD simulation, the diameter of the confluence 302 is set to 5 mm. Through the above-mentioned CFD simulation, the flow condition at the confluence 302 in the initial state is obtained as shown in Table 1. After the above-mentioned CFD simulation, the diameter of the confluence 302 is obtained as shown in Table 2, and the flow condition at the confluence 302 is obtained as shown in Table 3. In addition, the velocity cloud map, velocity streamline map, cross-sectional velocity vector map and velocity vector map at the outlet are visualized and simulated according to the flow condition.

[0040] Table 1 Vacuum cup suction rod number Flow rate at the confluence (g / s) 1 9.652 2 9.68 3 9.748 4 9.843 5 9.99 6 10.044 7 10.081 8 10.11 Table 2 Vacuum cup suction rod number Diameter of confluence port 1 5mm 2 5mm 3 5mm 4 5mm 5 5mm 6 4.7 mm 7 4.4 mm 8 4.4 mm Table 3 Vacuum cup suction rod number Flow rate at the confluence (g / s) 1 9.742 2 9.782 3 9.746 4 9.757 5 9.792 6 9.734 7 9.773 8 9.764 The flow rates at the confluence 302 in Tables 1 and 3 are analyzed. Before the caliber of the confluence 302 is adjusted, the flow rate difference between the maximum and minimum points is 0.458, and as the distance increases, the flow rate difference gradually changes. When the number of negative pressure cup suction rods 2 increases, the flow rate difference will become larger and larger. After adjustment, the flow rate difference between the maximum and minimum points is only 0.058, and all flow rate differences fluctuate within this range. As the number of negative pressure cup suction rods 2 increases, the flow rate difference will not fluctuate greatly. It can be seen that the method of this embodiment is used to set the calibers of different confluences 302, which can balance the vacuum degree of each negative pressure cup suction rod 2.

[0041] Reference Figure 1 As shown, in this embodiment, the shell 1 is provided with an opening. In order to ensure the sealing of the negative pressure chamber 101 in the shell 1, a cover plate 5 and a sealing plate 6 that cooperate with the shell 1 are provided at the opening.

[0042] Specifically, when using the integrated negative pressure module of the present invention, it is necessary to insert the negative pressure cup suction rod 2 into the liquid filling port of the battery. In order to ensure the sealing of the liquid filling port, the integrated negative pressure module is also provided to include a negative pressure suction nozzle 4 mounted on the end of the negative pressure cup suction rod 2. The negative pressure suction nozzle 4 can be inserted into the liquid filling port of the battery, and the negative pressure suction nozzle 4 is used to seal the liquid filling port.

[0043] The negative pressure suction nozzle 4 in the prior art is generally made of rubber material and has a certain amount of elastic deformation. The liquid filling port can be sealed by elastic deformation. However, there are certain problems in actual use. On the one hand, the shape of the liquid filling port of the battery is irregular, and the negative pressure suction nozzle 4 of different materials needs to be rotated according to the size of different liquid filling ports. On the other hand, when the negative pressure suction nozzle 4 made of elastic material is inserted into the liquid filling port, it is also squeezed to deform it and inserted into the liquid filling port. During the squeezing process, the liquid filling port is easily deformed, which affects the sealing of the battery when it is used.

[0044] In order to solve the problems existing in the above-mentioned negative pressure nozzle 4, refer to Figure 6 As shown, the negative pressure suction nozzle 4 is set to be an airbag type suction nozzle, having an airbag cavity. Before the negative pressure suction nozzle 4 is inflated, the airbag is in a contracted state, and its outer diameter is smaller than the injection port, ensuring that the negative pressure suction nozzle 4 can be inserted into the injection port. When the negative pressure suction nozzle 4 passes through the negative pressure port and reaches a specified position, the negative pressure suction nozzle 4 is inflated. After inflation, the negative pressure suction nozzle 4 presents an "I"-shaped structure, including a neck 401 and abutment portions 402 arranged on both sides of the neck 401. The neck 401 is arranged in the injection port, and the two abutment portions 402 are respectively arranged on both sides of the injection port, and are respectively abutted and sealed with the inner wall and outer wall of the injection port.

[0045] By using the negative pressure suction nozzle 4 of this embodiment, the small diameter air bag will not cause scratches or other damages to the inner wall of the liquid injection port when inserted, thereby extending the service life of the liquid injection port. In addition, it can be quickly and smoothly inserted into the liquid injection port, shortening the preparation time and improving work efficiency.

[0046] After the airbag is inflated, the abutment portion 402 forms a close contact with the inner and outer walls of the liquid injection port, effectively preventing liquid or gas from leaking from the interface, ensuring the sealing of the system, and the upper and lower parts abut the liquid injection port at the same time, which can also ensure the stable connection between the negative pressure suction nozzle 4 and the abutment portion 402, so that the negative pressure suction nozzle 4 is more firmly fixed in the liquid injection port and is not easy to be displaced or fall off.

[0047] Furthermore, since the airbag can be adaptively expanded according to the actual size of the injection port, the airbag can provide a good sealing effect even if the size of the injection port changes slightly, thereby increasing the versatility and flexibility of the device.

[0048] Specifically, the airbag suction nozzle used in this embodiment is detachably mounted outside the negative pressure cup suction rod 2 and is connected to the air pump through an air tube. When in use, its inflation and deflation state can be controlled by an external air pump.

[0049] Specifically, in actual use, the air pipe can also be connected to a negative pressure pump that provides a negative pressure air source for the negative pressure joint, and the airbag nozzle can be inflated by the air pump to ensure that it can be carried out synchronously with the vacuum pumping of the electrolyte.

[0050] Reference Figure 1 As shown, the integrated negative pressure module of the present invention needs to be used in conjunction with a driving component, and also includes: a mounting frame, the mounting frame includes: a top plate 7, a vertical plate 8 and a bottom plate 9, the top plate 7, the vertical plate 8 and the bottom plate 9 are fixedly connected to form a frame structure, wherein: the top plate 7 is arranged above the shell 1 and connected to the shell 1, the top plate 7 is used to connect to an external driving component, one end of the vertical plate 8 is connected to the top plate 7, the vertical plate 8 avoids the shell 1 and extends in the direction of the shell 1, the bottom plate 9 is connected to the vertical plate 8 through an elastic member 10, a through hole is provided on the bottom plate 9 for the negative pressure cup suction rod 2 to pass through, the bottom plate 9 can abut against the battery module, and the end of the negative pressure cup suction rod 2 is inserted into the liquid filling port of the battery by compressing the elastic member 10, and the battery module can be fixed during the formation process through the abutment of the bottom plate 9 with the battery module.

[0051] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. An integrated negative pressure module, characterized in that: include: A shell having a negative pressure chamber therein, a negative pressure interface being provided on one side of the shell, the negative pressure interface being in communication with the negative pressure chamber; A plurality of negative pressure cup suction rods, wherein the negative pressure cup suction rods are connected to the negative pressure chamber, and the distances between the plurality of negative pressure cup suction rods arranged along the first direction and the negative pressure interface are different; A confluence plate is arranged in the negative pressure chamber, and a confluence channel is opened in the confluence plate, and the confluence channel has a main channel and multiple branch channels, the main channel of the confluence channel is connected to the negative pressure interface, and the multiple branch channels of the confluence channel are respectively connected to the multiple negative pressure cup suction rods; Among them: on the confluence plate, a confluence port is opened at the connecting position between the branch channel of the confluence flow channel and the negative pressure cup suction rod, and the diameter of the confluence port gradually decreases from far to near along the first direction with the distance from the negative pressure interface, so that when negative pressure is generated at the negative pressure interface, the vacuum values ​​of multiple negative pressure cup suction rods are made consistent.

2. The integrated negative pressure module according to claim 1, characterized in that: The caliber of the confluence port is determined by a simulation method, and the simulation steps include: Construct a three-dimensional geometric model of an integrated negative pressure module, including: a shell, a negative pressure chamber, a negative pressure cup suction rod, a manifold, and a confluence flow channel, and simulate the location of the negative pressure interface setting and the size of the initial confluence port on the manifold; Importing the three-dimensional geometric model into the CFD simulation model, wherein: the CFD simulation model uses the negative pressure interface as the pressure inlet, specifies the required negative pressure value, and uses multiple confluence ports as the pressure outlet, which is set to the ambient pressure; The diameter of the confluence port is taken as the design variable, and an input parameter is created for the diameter of each confluence port. The objective function is to minimize the negative pressure value at each confluence port, and the diameter of each confluence port is adjusted to obtain a CFD simulation model.

3. The integrated negative pressure module according to claim 2, characterized in that: Taking minimizing the negative pressure value at each confluence as the objective function, the caliber of each confluence is adjusted by the gradient descent method, and the process of obtaining the CFD simulation model includes the following steps: A monitoring point is set at each negative pressure cup suction rod to measure and predict the vacuum degree; Set the initial confluence port diameter to D0; In each simulation calculation cycle, the current confluence diameter D is used. i Perform CFD simulation to calculate the predicted value for each monitoring point Pd , CFD ; Define the objective function f( D ) is the maximum difference in vacuum degree between the monitoring points: f( D )=max(∣ Pd , CFD ,1− Pd , CFD ,2∣,∣ Pd , CFD ,1− Pd , CFD ,3∣,…); Calculate the objective function f( D ) The gradient of ▽f( Di ): ； in, δk is a small perturbation used to approximate the gradient; Update the diameter of each confluence according to the direction and magnitude of the gradient: ； in: Di , k is the current caliber of the kth confluence; Di +1, k is the updated caliber of the kth confluence; η is the learning rate, which is used to control the adjustment step size.

4. The integrated negative pressure module according to claim 3, characterized in that: Use the updated conduit diameter Di +1 Re-run the CFD simulation to get new predictions Pd , CFD , calculate the new target f( Di +1), and set a preset threshold ε to determine the stop condition: If the objective function value f( Di +1) is less than the preset threshold ε, or the gradient is close to zero, the adjustment is stopped to obtain the final CFD simulation model; otherwise, the caliber of the confluence port is continuously updated iteratively until the stop condition is met.

5. The integrated negative pressure module according to claim 4, characterized in that: Use the diameter of the conduit that satisfies the stop condition Di +1Re-run CFD simulation and use visualization tools to check the vacuum distribution under each confluence diameter.

6. The integrated negative pressure module according to claim 2, characterized in that: The diameter of the confluence port is taken as the design variable, an input parameter is created for each confluence port diameter, and the maximum and minimum values ​​of the input parameter are determined.

7. The integrated negative pressure module according to claim 1, characterized in that: The shell is provided with an opening, and a cover plate and a sealing plate matched with the shell are provided at the opening.

8. The integrated negative pressure module according to claim 1, characterized in that: Also includes: A negative pressure suction nozzle is sleeved on the end of the negative pressure cup suction rod, and the negative pressure suction nozzle can be inserted into the liquid injection port of the battery, and the negative pressure suction nozzle is used to seal the liquid injection port.

9. The integrated negative pressure module according to claim 8, characterized in that: The negative pressure suction nozzle is an airbag suction nozzle. Before inflation, the outer diameter of the negative pressure suction nozzle is smaller than the liquid injection port and can be inserted into the liquid injection port. After inflation, the negative pressure suction nozzle presents an "I"-shaped structure, including a neck and abutment parts arranged on both sides of the neck. The neck is arranged in the liquid injection port, and the two abutment parts are respectively arranged on both sides of the liquid injection port, and are respectively abutted and sealed with the inner wall and outer wall of the liquid injection port.

10. The integrated negative pressure module according to claim 1, characterized in that: Also includes: A mounting frame, the mounting frame comprising: A top plate, arranged above the shell and connected to the shell, the top plate being used to connect to an external driving component; A vertical plate, one end of which is connected to the top plate, and the vertical plate avoids the shell and extends toward the shell; The bottom plate is connected to the vertical plate through an elastic member. A through hole is provided on the bottom plate for the negative pressure cup suction rod to pass through. The bottom plate can abut against the battery module, and the end of the negative pressure cup suction rod is inserted into the liquid filling port of the battery by compressing the elastic member.

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