Battery pack guard plate design method and design system thereof

Abstract

This invention provides a battery pack protective plate design method and system, relating to the field of battery pack protective plate design technology. The battery pack protective plate design method includes the following steps: inputting protective plate design requirements and obtaining multiple technical factors affecting the protective plate's deformation resistance; verifying the deformation resistance performance of each technical factor one by one, and obtaining the deformation resistance verification effect corresponding to each condition within each technical factor; combining the deformation resistance verification effects corresponding to each condition within multiple technical factors to obtain a combination of technical factors that meets the deformation resistance requirements and outputting its corresponding design standard. The battery pack protective plate design method and system provided by this invention can consider multiple technical factors, obtain a combination of technical factors that meets the technical requirements, and predict the rationality of the combination of technical factors, eliminating the need for repeated trial production and verification. This not only improves the efficiency of battery pack protective plate design but also saves the costs incurred in trial production and verification.

Description

Technical Field

[0001] This invention relates to the field of battery pack protective plate design technology, and in particular to a battery pack protective plate design method and design system. Background Technology

[0002] For CTP battery packs, the deformation resistance of the lower protective plate directly affects the safety performance of the internal cells. However, the design of the lower protective plate requires consideration of various factors such as materials, mounting methods, and thickness. Previous design methods relied on experience to create prototypes and then conduct tests to verify their performance. This not only resulted in a lack of unified standards for PACK (battery pack) protective plate design, requiring repeated modifications to technical parameters and prototype verification, but also made it difficult to achieve a low-cost design. Summary of the Invention

[0003] The purpose of this invention is to provide a battery pack protector design method and system to alleviate the technical problem that battery pack protectors need to be designed, prototyped, and verified based on experience, making it difficult to fully analyze and predict the performance of the protector.

[0004] In a first aspect, the battery pack protective plate design method provided by the present invention includes the following steps: Input the design requirements for the protective plate and obtain multiple technical factors that affect the deformation resistance of the protective plate; The deformation resistance performance was verified for each technical factor one by one, and the deformation resistance verification effect for each condition in each technical factor was obtained. By combining the deformation resistance verification effects corresponding to each condition among the multiple technical factors, a combination of technical factors that meets the deformation resistance requirements is obtained. The combination of technical factors that meet the requirements for resistance to deformation is used as the design standard output.

[0005] In conjunction with the first aspect, the present invention provides a first possible implementation of the first aspect, wherein the step of obtaining multiple technical factors affecting the deformation resistance of the protective plate includes: Options include obtaining material type, surface features, number of fixing points, and guard plate thickness.

[0006] In conjunction with the first possible implementation of the first aspect, the present invention provides a second possible implementation of the first aspect, wherein the step of verifying the anti-deformation performance for each technical factor and obtaining the anti-deformation verification effect corresponding to each condition in each technical factor includes: Keeping the surface features, the number of fixing points, and the thickness of the protective plate constant, the deformation of protective plates made of various materials under a preset external force collision was tested. Keeping the material type, the number of fixing points and the thickness of the protective plate unchanged, the deformation of the protective plate under the action of a preset external force is calculated by simulation topology under various surface feature conditions. Keeping the material type, surface features and plate thickness constant, test the deformation of plates with different numbers of fixing points under a preset external force collision. Keeping the material type, surface features, and number of fixing points constant, the deformation of the protective plate under a preset external force collision was tested under various thickness conditions.

[0007] In conjunction with the first aspect, the present invention provides a third possible implementation of the first aspect, wherein the step of combining the deformation resistance verification effects corresponding to each condition among the plurality of technical factors to obtain a combination of technical factors that meets the deformation resistance requirements includes: The deformation of the protective plate corresponding to each of the aforementioned technical factors under any selectable condition is summed; Determine the relationship between the sum of the deformations of the guard plate and the upper limit of the allowable deformation; Select and save the combination of technical factors where the sum of the guard plate deformations is less than the allowable upper limit of deformation.

[0008] In conjunction with the third possible implementation of the first aspect, the present invention provides a fourth possible implementation of the first aspect, wherein the step of summing the deformation of the protective plate corresponding to each of the plurality of said technical factors under any optional condition includes: Input the weight ratio of the guard plate deformation for each technical factor; The deformation of the protective plate corresponding to multiple technical factors under any selectable condition is weighted and summed.

[0009] In conjunction with the first aspect, the present invention provides a fifth possible implementation of the first aspect, wherein the battery pack protective plate design method further includes: By combining cost coefficients and processing difficulty coefficients, a combination of technical factors that meets the economic and processability requirements of the product is selected.

[0010] In conjunction with the fifth possible implementation of the first aspect, the present invention provides a sixth possible implementation of the first aspect, wherein the step of selecting a combination of technical factors that conforms to the economic efficiency and processability of the product by combining the cost coefficient and the processing difficulty coefficient includes: The cost coefficient and processing difficulty coefficient corresponding to multiple technical factors under any selectable condition are preset; Sum the cost coefficient and processing difficulty coefficient under any optional condition in the combination of technical factors that meet the deformation resistance requirements; Select and save the combination of technical factors in which the sum of the cost coefficient and the processing difficulty coefficient is less than or equal to the preset rationality coefficient.

[0011] In conjunction with the first aspect, the present invention provides a seventh possible implementation of the first aspect, wherein, in the step of verifying the anti-deformation performance for each technical factor one by one and obtaining the anti-deformation verification effect corresponding to each condition in each technical factor: A preset external force is applied to the protective plate by striking it with a ball in a direction perpendicular to the plate surface. Record the deformation dimensions of the guard plate in the direction perpendicular to the plate surface under each condition for each technical factor.

[0012] In conjunction with the seventh possible implementation of the first aspect, the present invention provides an eighth possible implementation of the first aspect, wherein the position where the protective plate is hit by the ball is selected to avoid the position of the frame, crossbeam and longitudinal beam.

[0013] Secondly, the battery pack protection plate design system provided by the present invention includes: The input module is used to input multiple technical factors that affect the deformation resistance of the protective plate; The simulation test module is used to verify the anti-deformation performance for each technical factor one by one, and to obtain the anti-deformation verification effect corresponding to each condition in each technical factor. The processing and analysis module is used to combine the anti-deformation verification effects corresponding to each condition among the multiple technical factors to obtain a combination of technical factors that meet the anti-deformation requirements. The output module is connected in sequence with the input module, the simulation test module, the processing and analysis module, and the output module. The output module is used to output the combination of technical factors.

[0014] The embodiments of this invention bring the following beneficial effects: By inputting the design requirements of the protective plate and obtaining multiple technical factors affecting the deformation resistance of the protective plate, the deformation resistance performance is verified one by one for each technical factor, and the deformation resistance verification effect corresponding to each condition of each technical factor is obtained. By combining the deformation resistance verification effects corresponding to each condition of multiple technical factors, a combination of technical factors that meets the deformation resistance requirements is obtained, and this combination of technical factors is output as the design standard. Multiple technical factors can be considered simultaneously to obtain a combination of technical factors that meets the technical requirements. This combination of technical factors can be used as the design standard to ensure that the protective plate meets the deformation resistance performance requirements, and the rationality of the combination of technical factors can be predicted in advance. There is no need for repeated trial production and verification, which not only improves the design efficiency of battery pack protective plates, but also saves the cost of trial production and verification.

[0015] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic flowchart of the battery pack protection plate design method provided in an embodiment of the present invention. Detailed Implementation

[0018] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities in the International System of Units (SI), or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] The battery pack protective plate design method provided in this embodiment of the invention includes the following steps: inputting protective plate design requirements and obtaining multiple technical factors affecting the protective plate's resistance to deformation; verifying the resistance to deformation for each technical factor one by one and obtaining the resistance to deformation verification effect corresponding to each condition in each technical factor; combining the resistance to deformation verification effects corresponding to each condition in multiple technical factors to obtain a combination of technical factors that meet the resistance to deformation requirements; and outputting the combination of technical factors that meet the resistance to deformation requirements as the design standard.

[0022] Using the above-described battery pack protector design method, the maximum allowable deformation resistance dimension μ can be input into the protector design requirements. Multiple technical factors can also be selected as preset conditions, such as inputting and setting material type, range of fixing points, optional surface features, and thickness range, and incorporating these into the design requirements. Subsequently, the deformation resistance performance is verified for each technical factor individually, revealing the deformation resistance effect corresponding to each option. By combining the deformation resistance effects of various conditions across multiple technical factors, a combination of technical factors that meets the deformation resistance requirements can be obtained. This design method considers multiple technical factors simultaneously, resulting in a combination that meets the technical requirements. This combination can serve as a design standard, including material type, number of fixing points, surface features, and protector thickness. Under the condition that the design requirements are met after combining multiple technical factors, the rationality of the combination can be predicted, ensuring that the designed protector meets the deformation resistance performance requirements. This eliminates the need for repeated trials and verifications, improving the efficiency of battery pack protector design and saving the costs associated with trial production and verification.

[0023] In this embodiment of the invention, the step of obtaining multiple technical factors affecting the deformation resistance of the protective plate includes: obtaining optional factors such as material type, surface features, number of fixing points, and thickness of the protective plate.

[0024] The available material types include sheet metal, composite materials, or aluminum plates. Surface features include stamped structures, slots, reinforcing ribs, textures, or cast grooves. The number of fixing points can be set based on the dimensions of the frame, crossbeams, and longitudinal beams, as well as the structure and dimensions of the guard plate, within a certain range to allow for selection of the most reasonable number of fixing points during the design process. The guard plate thickness can range from 1mm to 50mm, and this range can be narrowed down based on previous design experience to improve the efficiency of the design methodology.

[0025] like Figure 1 As shown, the steps for verifying the deformation resistance performance for each technical factor and obtaining the deformation resistance verification effect for each condition under each technical factor include: Keeping the surface features, number of fixing points, and plate thickness constant, the deformation amount b of various material plates under a preset external force impact was tested. ,

[0029] , ,

[0032] , ,

[0031] , ,

[0030] , where \(i\) is the serial number, corresponding to the number of optional types of the guard plate material. For example, in the case of four materials, they are: b1, b2, b3, and b4 respectively.

[0026] Keep the material type, the number of fixing points, and the thickness of the guard plate unchanged, and calculate the deformation amount \(a\) of the guard plate under the action of a preset external force collision under various surface feature conditions through simulation topology respectively. i ; where \(i\) is the serial number, corresponding to the number of types of surface features of the guard plate. For example, in the case of four surface features, they are a1, a2, a3, and a4 respectively.

[0027] Keep the material type, surface features, and the thickness of the guard plate unchanged, and test the deformation amount \(c\) of the guard plates with different numbers of fixing points under the action of a preset external force collision respectively. i , where \(i\) is the serial number, corresponding to the optional number of fixing points of the guard plate. For example, when the guard plate has four numbers of fixing points, its deformation amounts are c1, c2, c3, and c4 respectively.

[0028] Keep the material type, surface features, and the number of fixing points unchanged, and test the deformation amount \(d\) of the guard plates under various thickness conditions under the action of a preset external force collision respectively. i , where \(i\) is the serial number, corresponding to the number of optional thicknesses of the guard plate. For example, when the guard plate has four thicknesses, its deformation amounts are d1, d2, d3, and d4 respectively.

[0029] Furthermore, the steps of obtaining the combination of technical factors that meet the anti-deformation requirements by combining the anti-deformation verification effects corresponding to each condition in multiple technical factors include: summing up the deformation amounts of the guard plates corresponding to each technical factor under any optional condition; judging the magnitude relationship between the sum of the deformation amounts of the guard plates and the allowable deformation upper limit; selecting and saving the combination of technical factors whose sum of the deformation amounts of the guard plates is less than the allowable deformation upper limit.

[0030] Specifically, for the convenience of quickly knowing the combination of technical factors that meet the design requirements, the simulated deformation amounts under different technical factor variable conditions can be arranged in size first. For example, arranged in ascending order of deformation amount, recorded as: a1 < a2 < a3 < a4, b1 < b2 < b3 < b4, c1 < c2 < c3 < c4, d1 < d2 < d3 < d4. If a1 + b1 + c1 + d1 + < μ, it proves that this combination of technical factors meets the deformation amount design requirements.

[0031] In an optional implementation manner, the steps of summing up the deformation amounts of the guard plates corresponding to each technical factor under any optional condition include: inputting the weight ratio of the deformation amounts of the guard plates corresponding to each technical factor; performing weighted summation on the deformation amounts of the guard plates corresponding to multiple technical factors under any optional condition.

[0032] Different weight ratios can be assigned to different technical factors, allowing for more targeted emphasis on specific technical factors. Furthermore, reducing the weight of technical factors with a significant impact on cost can yield a lower-cost combination of technical factors. To prevent the final combination of technical factors from deviating from the permissible range, the weight ratio of each technical factor should be close to its mean 1 / n, where n is the number of technical factors. This avoids the design result deviating significantly from the one-to-one summation design result.

[0033] Furthermore, the battery pack protection plate design method also includes: combining the cost coefficient ε and the processing difficulty coefficient η to select a combination of technical factors that meet the product's economic and manufacturability requirements.

[0034] In this embodiment, the step of selecting a combination of technical factors that meets the economic and processability requirements of the product, by combining the cost coefficient ε and the processing difficulty coefficient η, includes: The cost coefficient ε and processing difficulty coefficient η corresponding to multiple technical factors under any selectable condition are preset; Sum the cost coefficient ε and processing difficulty coefficient η for any optional condition among the combinations of technical factors that meet the deformation resistance requirements; Select and save the combination of technical factors in which the sum of the cost coefficient ε and the processing difficulty coefficient η is less than or equal to the preset rationality coefficient α.

[0035] Specifically, surface features correspond to a cost coefficient ε1 and a processing difficulty coefficient η1. If ε1 + η1 = α, the product meets the requirements of economy and manufacturability; otherwise, it is defined as an unreasonable design. Materials correspond to a cost coefficient ε2 and a processing difficulty coefficient η2. If ε2 + η2 = α, the product meets the requirements of economy and manufacturability; otherwise, it is defined as an unreasonable design. The number of fixed points corresponds to a cost coefficient ε3 and a processing difficulty coefficient η3. If ε3 + η3 = α, the product meets the requirements of economy and manufacturability; otherwise, it is defined as an unreasonable design. Thickness corresponds to a cost coefficient ε4 and a processing difficulty coefficient η4. If ε4 + η4 = α, the product meets the requirements of economy and manufacturability; otherwise, it is defined as an unreasonable design.

[0036] If the above combination of technical factors cannot meet the requirements for deformation, economy, and processability, then the technical factors need to be reselected. Alternatively, the available options for the technical factors can be re-entered, or the design requirements can be changed. The final combination of technical factors that meets the product's economy and processability requirements, while satisfying the deformation resistance requirements, will be used as the design standard to ensure that the designed protective plate meets the requirements for deformation resistance, economy, and processability.

[0037] Furthermore, in the step of verifying the deformation resistance performance for each technical factor and obtaining the deformation resistance verification effect corresponding to each condition for each technical factor: a preset external force is applied by ball impact in a direction perpendicular to the surface of the protective plate; the deformation size of the protective plate in the direction perpendicular to the surface is recorded under each condition for each technical factor. By verifying the deformation of the protective plate installed at the bottom of the battery pack when subjected to an impact from directly below, the design standard of the lower protective plate that ensures the battery pack will not catch fire or explode can be obtained.

[0038] It should be noted that the location where the ball hits the guard plate should be avoided from the frame, crossbeam, and longitudinal beam, so as to verify the impact deformation resistance of the weakest point of the guard plate.

[0039] like Figure 1 As shown, the battery pack protection plate design system provided in this embodiment of the invention includes: The input module is used to input multiple technical factors that affect the deformation resistance of the protective plate; The simulation test module is used to verify the deformation resistance performance for each technical factor one by one, and to obtain the deformation resistance verification effect corresponding to each condition for each technical factor. The processing and analysis module is used to combine the anti-deformation verification effects of each condition among multiple technical factors to obtain a combination of technical factors that meet the anti-deformation requirements. The output module, input module, simulation test module, processing and analysis module and output module are connected in sequence. The output module is used to output the combination of technical factors.

[0040] In this embodiment of the invention, the input module can be a touch screen or keyboard, and the simulation test module uses modeling and finite element analysis software, mechanical testing equipment, or a data table established from multiple test results. Based on the input technical factor options, the corresponding deformation result can be obtained. The processing and analysis module calculates and compares the data, and finally outputs the combination of technical factors that meet the design requirements through the output module, so that technicians can understand the product's technical standards. The battery pack protection plate design system, equipped with the design method described in the above embodiments, has the same technical effect and will not be repeated here.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack protective plate design method, characterized in that, Includes the following steps: Input the design requirements for the protective plate and obtain multiple technical factors that affect the deformation resistance of the protective plate; The deformation resistance performance was verified for each technical factor one by one, and the deformation resistance verification effect for each condition in each technical factor was obtained. By combining the deformation resistance verification effects corresponding to each condition among the multiple technical factors, a combination of technical factors that meets the deformation resistance requirements is obtained. The combination of technical factors that meet the requirements for resistance to deformation is used as the design standard output; The steps of verifying the deformation resistance performance for each technical factor and obtaining the deformation resistance verification effect corresponding to each condition for each technical factor include: keeping the surface features, number of fixing points, and plate thickness constant, testing the deformation of plates made of various materials under a preset external force collision; keeping the material type, number of fixing points, and plate thickness constant, calculating the deformation of plates under a preset external force collision under various surface feature conditions through simulation topology; keeping the material type, surface features, and plate thickness constant, testing the deformation of plates with different numbers of fixing points under a preset external force collision; keeping the material type, surface features, and number of fixing points constant, testing the deformation of plates under a preset external force collision under various thickness conditions. The step of combining the deformation resistance verification effects of each condition among the multiple technical factors to obtain a combination of technical factors that meets the deformation resistance requirements includes: inputting the weight ratio of the plate deformation amount corresponding to each technical factor; performing a weighted summation of the plate deformation amounts corresponding to multiple technical factors under any selectable condition; determining the relationship between the weighted summation result and the allowable deformation upper limit; and selecting and saving the combination of technical factors whose weighted summation result is less than the allowable deformation upper limit.

2. The battery pack protective plate design method according to claim 1, characterized in that, The battery pack protective plate design method also includes: By combining cost coefficients and processing difficulty coefficients, a combination of technical factors that meets the economic and processability requirements of the product is selected.

3. The battery pack protective plate design method according to claim 2, characterized in that, The step of selecting a combination of technical factors that aligns with the product's economic viability and processability, by combining cost coefficients and processing difficulty coefficients, includes: The cost coefficient and processing difficulty coefficient corresponding to multiple technical factors under any selectable condition are preset; Sum the cost coefficient and processing difficulty coefficient under any optional condition in the combination of technical factors that meet the deformation resistance requirements; Select and save the combination of technical factors in which the sum of the cost coefficient and the processing difficulty coefficient is less than or equal to the preset rationality coefficient.

4. The battery pack protective plate design method according to claim 1, characterized in that, In the step of verifying the deformation resistance performance for each technical factor one by one and obtaining the deformation resistance verification effect corresponding to each condition for each technical factor: A preset external force is applied to the guard plate by striking it with a ball in a direction perpendicular to the guard plate surface. Record the deformation dimensions of the guard plate in the direction perpendicular to the plate surface under each condition for each technical factor.

5. The battery pack protective plate design method according to claim 4, characterized in that, The position where the ball hits the protective plate should be chosen to avoid the frame, crossbeam, and longitudinal beam.

6. A battery pack protection plate design system, characterized in that, include: The input module is used to input multiple technical factors that affect the deformation resistance of the protective plate; The simulation test module is used to verify the anti-deformation performance for each technical factor one by one, and to obtain the anti-deformation verification effect corresponding to each condition in each technical factor. The steps of verifying the anti-deformation performance for each technical factor and obtaining the anti-deformation verification effect for each condition of each technical factor include: keeping the surface features, number of fixing points, and plate thickness constant, testing the deformation amount bi of various material plates under a preset external force collision; keeping the material type, number of fixing points, and plate thickness constant, calculating the deformation amount ai of the plate under a preset external force collision under various surface feature conditions through simulation topology; keeping the material type, surface features, and plate thickness constant, testing the deformation amount ci of plate plates with different numbers of fixing points under a preset external force collision; keeping the material type, surface features, and number of fixing points constant, testing the deformation amount di of plate plates under a preset external force collision under various thickness conditions. The processing and analysis module is used to combine the deformation resistance verification effects corresponding to each condition among multiple technical factors to obtain a combination of technical factors that meets the deformation resistance requirements. The step of combining the deformation resistance verification effects corresponding to each condition among multiple technical factors to obtain a combination of technical factors that meets the deformation resistance requirements includes: inputting the weight ratio of the guard plate deformation amount corresponding to each technical factor; performing a weighted summation of the guard plate deformation amounts corresponding to multiple technical factors under any selectable condition; determining the relationship between the weighted summation result and the allowable deformation upper limit; and selecting and saving the combination of technical factors whose weighted summation result is less than the allowable deformation upper limit. The output module is connected in sequence with the input module, the simulation test module, the processing and analysis module, and the output module. The output module is used to output the combination of technical factors.

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