Explosion-proof valve design method
By using the relationship formula between the detonation value and residual thickness in the explosion-proof valve design, the problems of long design cycle and high cost of explosion-proof valves in the prior art are solved, and more accurate design and cost reduction are achieved.
Patent Information
- Application Number
- CN202510491447.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2025-07-22
AI Technical Summary
During the explosion-proof valve design process, after the explosion-proof valve is adjusted in the prior art, the residual thickness value is estimated only by relying on the experience of the designer, resulting in the construction of multiple models for simulation and calculation, extending the design cycle and increasing material costs.
By confirming the size parameters of the explosion-proof valve, selecting the reference model and obtaining the detonation value and residual thickness value, building a test model and conducting simulation and physical safety tests, using the relationship formula between the detonation value and residual thickness of the explosion-proof valve, the approximate range of residual thickness can be quickly obtained and the number of model constructions is reduced.
It improves the accuracy and efficiency of explosion-proof valve design, shortens the design cycle, and reduces the design cost.
Smart Images
Figure CN120354616A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of batteries, and in particular, to a design method for an explosion-proof valve. Background Art
[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, resulting in increasing requirements for the performance and safety of lithium-ion batteries. The explosion-proof valve of a lithium battery is a core component that determines the safety performance of the lithium battery, and the structural design of the explosion-proof valve is crucial for the safety of the battery.
[0003] With the update and iteration of the battery, correspondingly, parameters such as the detonation value, specification size, and residual thickness value of the explosion-proof valve equipped on the battery also need to be adjusted accordingly.
[0004] However, in the current design process of the explosion-proof valve, once the detonation value of the explosion-proof valve is adjusted, the residual thickness value of the explosion-proof valve can only be estimated based on the experience of designers, and dozens or hundreds of models are constructed for simulation and calculation. If one wants to obtain the parameters of a qualified explosion-proof valve that can pass the cell safety test, it is like looking for a needle in a haystack to detect one by one among many estimation models, which not only lengthens the design cycle, but also requires huge labor and material costs to construct many models. Summary of the Invention
[0005] The purpose of this application is to provide a design method for an explosion-proof valve to solve, to a certain extent, the technical problems existing in the prior art that in the current design process of the explosion-proof valve, once the detonation value of the explosion-proof valve is adjusted, the residual thickness value of the explosion-proof valve can only be estimated based on the experience of designers, and dozens or hundreds of models are constructed for simulation and calculation. If one wants to obtain the parameters of a qualified explosion-proof valve that can pass the cell safety test, it is like looking for a needle in a haystack to detect one by one among many estimation models, which not only lengthens the design cycle, but also requires huge labor and material costs to construct many models.
[0006] According to a first aspect of this application, a design method for an explosion-proof valve is provided for designing an explosion-proof valve. The explosion-proof valve includes a detonation part, a scoring part, and an external support part. The external support part is connected to the detonation part via the scoring part. The external support part and the scoring part are both arranged around the detonation part for one week. The scoring part includes a thinning section and a connecting section connected end to end. Define the thickness of the thinning section as the residual thickness; Its steps include: Confirm the size parameters of the explosion-proof valve and select the size of the explosion-proof valve according to the cell specification requirements; Select a reference model, select a reference model according to the explosion-proof valve design requirements, and obtain the detonation value and the residual thickness value of the reference model ; Build a test model and input the designed detonation value of the explosion-proof valve into the formula to obtain the remaining thickness of the explosion-proof valve ; Detect the model and conduct simulation safety tests and physical safety tests according to the remaining thickness of the explosion-proof valve .
[0007] Preferably, if the explosion-proof valve to be designed is a modification of an existing explosion-proof valve, the reference model is the existing explosion-proof valve
[0008] Preferably, the step of selecting the reference model includes Construct an initial model and construct an initial model of the explosion-proof valve based on the size parameters of the explosion-proof valve according to experience Detect the initial model and conduct simulation safety tests and physical safety tests according to the initial model parameters If the simulation safety test and the physical safety test of the initial model pass, the design is completed If the simulation safety test or the physical safety test of the initial model fails, the initial model is the reference model
[0009] Preferably, when the material of the explosion-proof valve is MFX2, the value of k is 0.0004
[0010] Preferably, the remaining thickness value of the explosion-proof valve is greater than or equal to 40μm
[0011] Preferably, the size parameters of the explosion-proof valve include the length and width of the explosion-proof valve wherein, the length of the explosion-proof valve is the maximum dimension in the extension direction of the explosion-proof valve, and the width of the explosion-proof valve is the dimension perpendicular to the extension direction of the explosion-proof valve
[0012] Preferably, the simulation safety test includes Establish a numerical simulation model and construct a numerical simulation model according to the remaining thickness of the explosion-proof valve and the parameters of the battery cell Simulate the detonation experiment and conduct multiple detonation experiments on the numerical simulation model to judge whether the numerical simulation model can detonate when the detonation value reaches and judge whether the process capability index of the numerical simulation model at the detonation value of is greater than the predetermined value
[0013] Preferably, the physical safety test includes Cover plate mold opening, design the cover plate according to the size of the explosion-proof valve and mold it to manufacture the cover plate with the explosion-proof valve Initiation experiment: Conduct an initiation experiment on the cover plate to verify whether the initiation value and the remaining thickness value of the explosion-proof valve match.
[0014] Preferably, if the verification result of the initiation experiment is mismatched, repeat the step of selecting the reference model; If the verification result of the initiation experiment is matched, the physical safety test further includes: Prototype the battery cell and conduct tests: Manufacture test battery cells according to the structure of the cover plate with the explosion-proof valve, and conduct battery cell safety tests on the test battery cells.
[0015] Preferably, the battery cell safety test includes vibration test and / or drop test and / or thermal runaway test.
[0016] Compared with the prior art, the beneficial effects of the present application are as follows: The explosion-proof valve design method provided by the present application finds the relationship between the initiation value and the remaining thickness of the explosion-proof valve through multiple experiments by the applicant, so that in the process of designing the explosion-proof valve, designers can quickly obtain the approximate range of the remaining thickness of the explosion-proof valve under a predetermined initiation value according to Formula 1 summarized based on the above relationship (i.e., ), effectively replacing the current mode of estimating and constructing the explosion-proof valve model solely based on experience, making the construction of the explosion-proof valve model more accurate and closer to the reasonable value, thereby effectively reducing the number of explosion-proof valve models built during the design process, effectively shortening the design cycle, and reducing the design cost.
[0017] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. Description of the Drawings
[0018] To more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0019] Figure 1 Isometric structural schematic diagram of the explosion-proof valve provided by the embodiment of the present application; Figure 2 Front view structural schematic diagram of the explosion-proof valve provided by the embodiment of the present application; Figure 3 Is Figure 2 Sectional structural schematic diagram of the explosion-proof valve obtained by cutting along the A-A direction; Figure 4 Flow schematic diagram of the explosion-proof valve design method provided by the embodiment of the present application.
[0020] Reference numerals: 1 - Initiation part; 2 - Scoring part; 21 - Thinning section; 22 - Connecting section; 3 - External support part. Detailed implementation manners
[0021] The technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.
[0022] Generally, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.
[0023] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.
[0024] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0025] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0026] Next, refer to Figures 1 to 4 Describe the explosion-proof valve design method according to some embodiments of the present application.
[0027] See Figures 1 to 3As shown, the structure of the explosion-proof valve to which the explosion-proof valve design method provided by the present application is applicable is shown. The explosion-proof valve includes a detonating part 1, a scoring part 2, and an external support part 3. The external support part 3 is connected to the detonating part 1 via the scoring part 2. Both the external support part 3 and the scoring part 2 are arranged around the detonating part 1 for one week. The scoring part 2 includes a thinning section 21 and a connecting section 22 connected end to end. The thickness of the thinning section 21 ( Figure 3 The T value shown) is defined as the remaining thickness.
[0028] Specifically, as Figure 4 shown, an embodiment of the first aspect of the present application provides an explosion-proof valve design method, and its steps include: S10 Confirm the size parameters of the explosion-proof valve, and select the size of the explosion-proof valve according to the requirements of the battery cell specifications.
[0029] Optionally, the size parameters of the above explosion-proof valve may include the length and width of the explosion-proof valve. Among them, as Figure 2 shown, the length of the explosion-proof valve (i.e., the L value shown in the figure) may be the maximum size of the explosion-proof valve in the extending direction. Similarly, the width of the explosion-proof valve (i.e., the W value shown in the figure) may be the size of the explosion-proof valve in the direction perpendicular to the extending direction of the explosion-proof valve.
[0030] S20 Select a reference model, select a reference model according to the explosion-proof valve design requirements, and obtain the detonation value of the reference model and the remaining thickness value of the reference model .
[0031] Optionally, not shown in the figure, if the explosion-proof valve to be designed is a modification of an existing explosion-proof valve, the above reference model may be the existing explosion-proof valve. Correspondingly, the above value and value are the parameters of the existing explosion-proof valve.
[0032] Preferably, as Figure 4 shown, the step of selecting a reference model in S20 above may include S21 constructing an initial model. Based on experience, an initial model of the explosion-proof valve is constructed on the basis of the size parameters of the explosion-proof valve. In this way, the initial model data value and value are obtained through experience.
[0033] Optionally, the remaining thickness value T of the explosion-proof valve may be greater than or equal to 40 μm to reduce the probability of the explosion-proof valve being damaged and leaking liquid under conditions such as vibration and impact. It should be noted that the remaining thickness value T of the explosion-proof valve being greater than or equal to 40 μm here can be understood as the value selected based on experience in the above S21 constructing an initial model being greater than or equal to 40 μm.
[0034] Similarly, the detonation value Q of the above explosion-proof valve can be selected within the range of 0.4 Mpa to 1.1 Mpa, that is, the value selected based on experience in the above S21 to construct the initial model can be selected within the range of 0.4 Mpa to 1.1 Mpa. For example, it can be equal to 0.6 ± 0.2 Mpa, 0.9 ± 0.2 Mpa.
[0035] Preferably, as Figure 4 shown, the above S20 to select the reference model step may further include S22 to detect the initial model, and perform simulation safety testing and physical safety testing according to the initial model parameters to verify whether the above initial model meets the design requirements through the detection. It should be noted that the simulation safety testing and physical safety testing in the S22 to detect the initial model step are similar to the simulation safety testing and physical safety testing in the following S40 to detect the model step, and will not be elaborated here.
[0036] Optionally, as Figure 4 shown, if the simulation safety testing and physical safety testing of the initial model pass, the design is completed.
[0037] Optionally, as Figure 4 shown, if the simulation safety testing or physical safety testing of the initial model fails, the initial model is the above reference model.
[0038] S30 constructs a test model, and substitutes the designed detonation value of the explosion-proof valve into the formula to obtain the remaining thickness of the explosion-proof valve.
[0039] Referring to Table 1, in order for the applicant to verify the relationship between the notch remaining thickness of the explosion-proof valve and the detonation value of the explosion-proof valve, the detonation value Q of the explosion-proof valve and the law between the notch remaining thickness T of the explosion-proof valve obtained by conducting detonation experiments on explosion-proof valves of the same material and the same size specifications are adopted.
[0040] Table 1:
[0041] According to the data recorded in Table 1, it can be calculated that T2 - T1 = 0.004 mm, T3 - T2 = 0.004 mm, T4 - T3 = 0.004 mm. In other words, for every 0.1 Mpa increase in the detonation value, the remaining thickness of the explosion-proof valve increases by 0.004 mm. = k, where K is a constant. Then the formula 1 is obtained: , where k can be equal to a constant value.
[0042] Based on this, through multiple experiments by the applicant, the relationship between the detonation value and the remaining thickness of the explosion-proof valve is found, so that in the design process of the explosion-proof valve, the designer can obtain the approximate range of the remaining thickness of the explosion-proof valve under a predetermined detonation value according to the formula 1 summarized from the above relationship (that is, ), which effectively replaces the current mode of constructing the explosion-proof valve model solely by empirical estimation, making the construction of the explosion-proof valve model more accurate and closer to the reasonable value, thereby effectively reducing the number of models of the explosion-proof valve in the design process, effectively shortening the design cycle, and reducing the design cost.
[0043] Preferably, as shown in Appendix 1, taking the material of the above explosion-proof valve as MFX2 as an example, the above K value can be 0.0004.
[0044] S40 Detect the model, and conduct simulation safety tests and physical safety tests according to the remaining thickness of the explosion-proof valve
[0045] Optionally, the above simulation safety test may include: S411 Establish a numerical simulation model, and construct a numerical simulation model according to the remaining thickness of the explosion-proof valve and the parameters of the battery cell.
[0046] S412 Simulate the detonation experiment, conduct multiple simulation detonation experiments on the numerical simulation model to judge whether the numerical simulation model can detonate when the detonation value reaches , and judge whether the process capability index (i.e., CPK) of the numerical simulation model when the detonation value is is greater than the predetermined value.
[0047] Preferably, the predetermined value can be greater than 1.33, that is, CPK > 1.33, to ensure the detonation stability of the explosion-proof valve.
[0048] Optionally, if the numerical simulation model can detonate smoothly when in the simulation detonation experiment in step S412, and CPK > 1.33, then conduct the above physical safety test.
[0049] Optionally, if the numerical simulation model cannot detonate smoothly when in the simulation detonation experiment in step S412, or CPK ≤ 1.33, then repeat step S20 to select a reference model.
[0050] Optionally, the above simulation safety test may include: S421 Cover die opening, design a cover according to the size of the explosion-proof valve, and open a die to manufacture a cover with the explosion-proof valve.
[0051] S422 Detonation experiment, conduct a detonation experiment on the cover to verify whether the detonation value and the remaining thickness value of the explosion-proof valve match.
[0052] Optionally, if the detonation value and the remaining thickness value of the explosion-proof valve match in the detonation experiment of step S422, then proceed with the following S423 trial production of the battery cell and inspection steps.
[0053] Optionally, if the detonation value and the remaining thickness value of the explosion-proof valve do not match in the detonation experiment of step S422, then repeat step S20 to select a reference model.
[0054] S423 Trial production of the battery cell and inspection: Manufacture a test battery cell according to the structure of the cover plate with the explosion-proof valve, and conduct a safety test on the test battery cell.
[0055] Optionally, the above battery cell safety test may include a vibration test to detect the physical impact resistance and vibration resistance of the test battery cell.
[0056] Optionally, the above battery cell safety test may include a drop test to detect the drop resistance of the test battery cell.
[0057] Optionally, the above battery cell safety test may include a thermal runaway test to detect the thermal runaway parameters of the test battery cell (for example, parameters such as the heat generation and specific heat capacity during discharge of the test battery cell, the initial temperature of thermal runaway, the maximum thermal runaway rate, the adiabatic temperature rise characteristic, the gas generation amount and gas generation rate of the battery).
[0058] It should be noted that the above vibration test, drop test and thermal runaway test are all existing test technologies in the art and will not be elaborated here.
[0059] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. An explosion-proof valve design method, characterized in that, For designing an explosion-proof valve, the explosion-proof valve includes a detonating part, a scoring part, and an external support part. The external support part is connected to the detonating part via the scoring part. The external support part and the scoring part are both arranged around the detonating part in a circle. The scoring part includes a thinning section and a connecting section connected end to end. Define the thickness of the thinning section as the remaining thickness; The steps include: Confirm the size parameters of the explosion-proof valve and select the size of the explosion-proof valve according to the requirements of the cell specifications; Select a reference model, select a reference model according to the design requirements of the explosion-proof valve, and obtain the detonation value of the reference model and the remaining thickness value of the reference model ; Build a test model and input the designed detonation value of the explosion-proof valve into the formula to obtain the remaining thickness of the explosion-proof valve ; Detect the model and conduct simulation safety tests and physical safety tests according to the remaining thickness of the explosion-proof valve 2. The explosion-proof valve design method according to claim 1, wherein If the explosion-proof valve to be designed is a modification of an existing explosion-proof valve, the reference model is the existing explosion-proof valve.
3. The explosion-proof valve design method according to claim 1, characterized in that, The step of selecting the reference model includes: Construct an initial model. Based on experience and on the basis of the size parameters of the explosion-proof valve, construct an initial model of the explosion-proof valve; Detect the initial model and conduct simulation safety tests and physical safety tests according to the parameters of the initial model; If the simulation safety test and the physical safety test of the initial model pass, the design is completed; If the simulation safety test or the physical safety test of the initial model fails, the initial model is the reference model.
4. The explosion-proof valve design method according to claim 1, characterized in that, When the material of the explosion-proof valve is MFX2, the k value is 0.0004.
5. The explosion-proof valve design method according to claim 1, characterized in that, The remaining thickness value of the explosion-proof valve is greater than or equal to 40 μm.
6. The explosion-proof valve design method according to claim 1, characterized in that, The size parameters of the explosion-proof valve include the length and the width of the explosion-proof valve; Wherein, the length of the explosion-proof valve is the maximum dimension of the explosion-proof valve in the extending direction, and the width of the explosion-proof valve is the dimension of the explosion-proof valve perpendicular to the extending direction of the explosion-proof valve.
7. The explosion-proof valve design method according to claim 1, wherein The simulation safety test includes: Build a numerical simulation model and construct a numerical simulation model according to the remaining thickness of the explosion-proof valve and the parameters of the battery cell; Simulate the detonation experiment, conduct multiple simulated detonation experiments on the digital simulation model to determine whether the digital simulation model can detonate when the detonation value reaches and to determine whether the process capability index of the digital simulation model is greater than a predetermined value when the detonation value is 8. The explosion-proof valve design method according to claim 1, wherein The physical safety test includes: Cover die-casting. Design a cover according to the size of the explosion-proof valve and die-cast a cover with the explosion-proof valve; Detonation experiment. Conduct a detonation experiment on the cover to verify whether the detonation value and the remaining thickness value of the explosion-proof valve match.
9. The explosion-proof valve design method according to claim 8, wherein, If the verification result of the detonation experiment is unmatched, repeat the step of selecting the reference model; If the verification result of the detonation experiment is matched, the physical safety test further includes: Prototype a cell and detect. Manufacture a test cell according to the structure of the cover with the explosion-proof valve and conduct a cell safety test on the test cell.
10. The explosion-proof valve design method according to claim 9, characterized in that, The cell safety test includes a vibration test and / or a drop test and / or a thermal runaway test.