Method for acquiring welding resistance of battery cell structural member, medium and program product

Abstract

The invention discloses a battery cell structural member welding resistance obtaining method, a medium and a program product. The battery cell structural member welding resistance obtaining method comprises the steps of obtaining test resistance values of a first battery cell structural sample piece and a second battery cell structural sample piece; based on the test resistance values of the first battery cell structure sample piece and the second battery cell structure sample piece, the contact resistance between the first battery cell structure sample piece and the probe and the contact resistance between the second battery cell structure sample piece and the probe are obtained in a simulation mode by utilizing the three-dimensional electrostatic models of the first battery cell structure sample piece and the second battery cell structure sample piece; obtaining a test resistance value of a welding sample generated after the first cell structure sample and the second cell structure sample are welded; and based on the test resistance value of the welding sample piece and the contact resistance between the first battery cell structure sample piece and the probe and between the second battery cell structure sample piece and the probe, the welding resistance of the welding sample piece is obtained in a simulation mode by utilizing the three-dimensional electrostatic model of the welding sample piece. According to the invention, the welding resistance value of the welding sample piece can be accurately obtained, so that the over-current capability of the cell structure piece under different working conditions can be evaluated.

Description

Technical Field

[0001] This invention belongs to the field of lithium-ion battery technology, specifically relating to a method, medium, and program product for obtaining the welding resistance of battery cell structural components. Background Technology

[0002] In the production process of lithium batteries, the welding quality of the electrode sheets directly affects the overall performance, safety, and lifespan of the battery. A significant increase in welding resistance exacerbates the generation of Joule heat when current passes through the welding point, especially during fast charging. Due to the high thermal conductivity of the cell components and the welding area, localized temperature rises can rapidly spread throughout the entire core via heat conduction, leading to abnormally high core temperatures. This phenomenon not only impairs the electrochemical performance of the cell, such as capacity decay and increased internal resistance, but also exacerbates the risk of thermal runaway, posing a potential threat to the overall safety of the battery system.

[0003] Therefore, accurately measuring welding resistance and using it to assess welding quality has become a crucial step in ensuring cell safety. However, traditional internal resistance testers are time-consuming and inefficient. During testing, the physical contact between the internal resistance meter probe and the sample inevitably introduces contact resistance, which fluctuates with changes in contact conditions, significantly increasing measurement uncertainty. To obtain accurate welding resistance values, technicians must invest considerable time and resources in repeated testing and data analysis to estimate and eliminate the influence of contact resistance. This process is not only costly but also prolongs product development cycles. Furthermore, for samples using the same welding process but with different dimensions, traditional methods cannot provide an effective predictive mechanism or empirical model to predict their welding resistance. This means that regardless of sample size variations, each sample must be individually tested through independent experiments to determine its welding resistance, lacking flexibility and predictability, limiting the speed and efficiency of process optimization, and negatively impacting production schedules and cost control. Therefore, exploring more efficient and accurate welding resistance measurement methods has become a critical issue that urgently needs to be addressed in the lithium battery manufacturing industry. Summary of the Invention

[0004] To address the aforementioned issues, this invention proposes a method, medium, and program product for obtaining the welding resistance of battery cell structural components. This method can accurately obtain the welding resistance value of the welded sample, thereby facilitating the evaluation of the overcurrent capacity of battery cell structural components under different operating conditions.

[0005] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0006] In a first aspect, the present invention provides a method for obtaining the welding resistance of a battery cell structural component, comprising:

[0007] Obtain the test resistance values ​​of the first and second battery cell structure samples;

[0008] Based on the test resistance values ​​of the first and second battery cell structure samples, the contact resistance between the first and second battery cell structure samples and the probe, as well as the contact resistance between the second and third battery cell structure samples and the probe, are obtained by simulation using the three-dimensional electrostatic models of the first and second battery cell structure samples.

[0009] Obtain the test resistance value of the welded sample generated by welding the first battery cell structure sample and the second battery cell structure sample;

[0010] Based on the test resistance value of the welded sample, the contact resistance between the first cell structure sample and the probe, and the contact resistance between the second cell structure sample and the probe, the welding resistance of the welded sample is obtained by simulation using the three-dimensional electrostatic model of the welded sample.

[0011] In the above scheme, the welding resistance of the battery cell structure is obtained by combining a three-dimensional electrostatic model with experiments. The three-dimensional electrostatic model can identify the contact resistance between the probe of the internal resistance meter and the battery cell structure sample, eliminating the interference of the contact resistance on the welding resistance and obtaining accurate welding resistance values, so as to evaluate the overcurrent capacity of the battery cell structure under different operating conditions.

[0012] In conjunction with the first aspect, optionally, the contact resistance between the first cell structure sample and the probe is obtained using the following method:

[0013] Based on the three-dimensional electrostatic model of the first battery cell structure sample, the contact resistance between the probe and the first battery cell structure sample in the three-dimensional electrostatic model was adjusted using simulation software. The resistance value between the probes at both ends of the first battery cell structure sample was simulated. ;

[0014] Response to resistance value Test resistance value of the first cell structure sample If they are equal, stop adjusting; at this point, the contact resistance... This refers to the contact resistance between the probe and the first battery cell structure sample.

[0015] The above solution provides a method for obtaining the contact resistance between the first battery cell structure sample and the probe, which is different from the existing technology. It realizes the simulation and calibration of the contact resistance between the probe and the first battery cell structure sample, and is used to eliminate the interference of contact resistance on welding resistance.

[0016] In conjunction with the first aspect, optionally, the contact resistance between the second cell structure sample and the probe is obtained using the following method:

[0017] Based on the three-dimensional electrostatic model of the second battery cell structure sample, the contact resistance between the probe and the second battery cell structure sample in the three-dimensional electrostatic model was adjusted using simulation software. The resistance value between the probes at both ends of the second cell structure sample was simulated. ;

[0018] Response to resistance value Test resistance value of the second cell structure sample If they are equal, stop adjusting; at this point, the contact resistance... This refers to the contact resistance between the probe and the second battery cell structure sample.

[0019] The above solution provides a method for obtaining the contact resistance between the second cell structure sample and the probe, which is different from the existing technology. It realizes the simulation and calibration of the contact resistance between the probe and the second cell structure sample, and is used to eliminate the interference of contact resistance on welding resistance.

[0020] In conjunction with the first aspect, optionally, the formula for calculating the contact resistance is:

[0021] ;

[0022] in, The normal current density, For contact resistance, This represents the potential difference between the two sides of the welding surface.

[0023] The above scheme provides a specific formula for calculating contact resistance and explains in detail the logic of calculating contact resistance using a three-dimensional electrostatic model.

[0024] In conjunction with the first aspect, optionally, the method for obtaining the welding resistance of the welded sample includes:

[0025] Based on the three-dimensional electrostatic model of the welded sample, the contact resistance between the probe and the first battery cell structure sample, and the contact resistance between the probe and the second battery cell structure sample, the welding resistance in the three-dimensional electrostatic model of the welded sample was adjusted using simulation software. The resistance value between the probes at both ends of the welded sample was simulated. ;

[0026] Response to resistance value Test resistance value of welded sample If they are equal, stop adjusting; at this point, the welding resistance... This refers to the welding resistance of the welded sample.

[0027] The above solution provides a method for obtaining the welding resistance of a welding sample that differs from existing technologies. The contact resistance between the probe and the first battery cell structure sample, and the contact resistance between the probe and the second battery cell structure sample, are used as input parameters for the three-dimensional electrostatic model of the welding sample. This eliminates the interference of contact resistance on the welding resistance. Simulation software is used to continuously adjust the value of the welding resistance until the resistance between the probes at both ends of the welding sample is simulated. Test resistance value of welded sample Equal values ​​allow for the acquisition of precise welding resistance values, facilitating the evaluation of the overcurrent capacity of battery cell components under different operating conditions.

[0028] In conjunction with the first aspect, optionally, the method for obtaining the welding resistance of the welded sample further includes:

[0029] If the welding resistance of welding samples of different sizes is different, the conductivity of the welding sample in the three-dimensional electrostatic model of the welding sample is adjusted by using simulation software to make the welding resistance of welding samples of different sizes consistent. The welding resistance obtained at this time is the true welding resistance. The same welding process is used for welding samples of different sizes.

[0030] In the above scheme, according to theoretical analysis, the welding resistance of different sizes should be consistent. Therefore, if the welding resistance of different sizes is inconsistent, the conductivity of the sample in the model is adjusted to make the welding resistance of different sizes consistent, eliminating the influence of the deviation in the conductivity setting of the sample. The welding resistance obtained at this time is the true welding resistance of the sample.

[0031] In conjunction with the first aspect, optionally, the first battery cell structure sample and the second battery cell structure sample have the same structural dimensions.

[0032] In the above scheme, the structural dimensions of the first battery cell structure sample and the second battery cell structure sample are designed to be the same, which facilitates modeling.

[0033] Secondly, the present invention provides a method for obtaining the welding resistance of a battery cell structural component, comprising:

[0034] The test resistance values ​​of the first and second battery cell structure samples were obtained using an internal resistance meter.

[0035] Based on the test resistance values ​​of the first and second battery cell structure samples, and the three-dimensional electrostatic models of the first and second battery cell structure samples, the contact resistance between the first battery cell structure sample and the probe, and the contact resistance between the second battery cell structure sample and the probe are obtained by simulation.

[0036] The resistance value of the welded sample generated by welding the first cell structure sample and the second cell structure sample was obtained using an internal resistance meter.

[0037] Based on the test resistance value of the welded sample, the contact resistance between the first cell structure sample and the probe, and the contact resistance between the second cell structure sample and the probe, the welding resistance of the welded sample is obtained by simulation using the three-dimensional electrostatic model of the welded sample.

[0038] In the above scheme, the welding resistance of the battery cell structure is obtained by combining a three-dimensional electrostatic model with experiments. The three-dimensional electrostatic model can identify the contact resistance between the probe of the internal resistance meter and the battery cell structure sample, eliminating the interference of the contact resistance on the welding resistance and obtaining accurate welding resistance values, so as to evaluate the overcurrent capacity of the battery cell structure under different working conditions.

[0039] Thirdly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for obtaining the welding resistance of the battery cell structure as described in any one of the first aspects.

[0040] Fourthly, the present invention provides a computer program product, including a computer program / instructions, which, when executed by a processor, implements the method for obtaining the welding resistance of the battery cell structure as described in the first aspect.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0042] In this invention, the welding resistance of battery cell structural components is obtained by combining a three-dimensional electrostatic model with experiments. The three-dimensional electrostatic model can identify the contact resistance between the probe of the internal resistance meter and the battery cell structural sample, eliminating the interference of contact resistance on the welding resistance and obtaining accurate welding resistance values, so as to evaluate the overcurrent capability of battery cell structural components under different operating conditions.

[0043] Furthermore, this invention proposes to simultaneously simulate the welding resistance of welded samples made from battery cell structure samples of different sizes, and to obtain accurate welding resistance of structural components by iterating and correcting the three-dimensional electrostatic model through experimental results, thereby accelerating the performance evaluation of structural components and shortening the mold opening and development cycle of battery cell structural components and battery cell products. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0045] Figure 1This is a flowchart illustrating a method for obtaining the welding resistance of a battery cell structure according to an embodiment of the present invention.

[0046] Figure 2 This is a geometric structural schematic diagram of an unwelded first battery cell structure sample provided in an embodiment of the present invention;

[0047] Figure 3 This is a geometric structural schematic diagram of an unwelded second cell structure sample provided in an embodiment of the present invention;

[0048] Figure 4 This is a top view of the geometric structure of a welding sample provided in an embodiment of the present invention;

[0049] Figure 5 This is a side view of the geometric structure of a welding sample provided in an embodiment of the present invention;

[0050] Figure 6 This is a schematic diagram of a three-dimensional electrostatic model provided in an embodiment of the present invention. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0052] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0053] Example 1

[0054] This invention provides a method for obtaining the welding resistance of a battery cell structural component, comprising the following steps:

[0055] (1) Obtain the test resistance values ​​of the first battery cell structure sample and the second battery cell structure sample; in the specific implementation process, the test resistance values ​​of the first battery cell structure sample and the second battery cell structure sample can be obtained by testing with an internal resistance meter;

[0056] (2) Based on the test resistance values ​​of the first battery cell structure sample and the second battery cell structure sample, the contact resistance between the first battery cell structure sample and the probe, and the contact resistance between the second battery cell structure sample and the probe are obtained by simulation using the three-dimensional electrostatic model of the first battery cell structure sample and the second battery cell structure sample.

[0057] (3) Obtain the test resistance value of the welded sample generated by welding the first battery cell structure sample and the second battery cell structure sample; in the specific implementation process, the test resistance value of the welded sample can be obtained by testing with an internal resistance meter;

[0058] (4) Based on the test resistance value of the welded sample, the contact resistance between the first cell structure sample and the probe, and the contact resistance between the second cell structure sample and the probe, the welding resistance of the welded sample is obtained by simulation using the three-dimensional electrostatic model of the welded sample.

[0059] The method for obtaining the welding resistance of the battery cell structure in this embodiment of the invention obtains the welding resistance of the battery cell structure by combining a three-dimensional electrostatic model with experiments. The three-dimensional electrostatic model can identify the contact resistance between the probe of the internal resistance meter and the battery cell structure sample, eliminating the interference of the contact resistance on the welding resistance, and can obtain accurate welding resistance values, so as to evaluate the overcurrent capability of the battery cell structure under different operating conditions.

[0060] In a specific embodiment of the present invention, the contact resistance between the first battery cell structure sample and the probe is obtained by the following method:

[0061] Based on the three-dimensional electrostatic model of the first battery cell structure sample, the contact resistance between the probe and the first battery cell structure sample in the three-dimensional electrostatic model was adjusted using simulation software. The resistance value between the probes at both ends of the first battery cell structure sample was simulated. ;

[0062] Response to resistance value Test resistance value of the first cell structure sample If they are equal, stop adjusting; at this point, the contact resistance... This refers to the contact resistance between the probe and the first battery cell structure sample.

[0063] The above solution provides a method for obtaining the contact resistance between the first battery cell structure sample and the probe, which is different from the existing technology. It realizes the simulation and calibration of the contact resistance between the probe and the first battery cell structure sample, and is used to eliminate the interference of contact resistance on welding resistance.

[0064] In one specific embodiment of the present invention, the contact resistance between the second battery cell structure sample and the probe is obtained by the following method:

[0065] Based on the three-dimensional electrostatic model of the second battery cell structure sample, the contact resistance between the probe and the second battery cell structure sample in the three-dimensional electrostatic model was adjusted using simulation software. The resistance value between the probes at both ends of the second cell structure sample was simulated. ;

[0066] Response to resistance value Test resistance value of the second cell structure sample If they are equal, stop adjusting; at this point, the contact resistance... This refers to the contact resistance between the probe and the second battery cell structure sample.

[0067] The above solution provides a method for obtaining the contact resistance between the second cell structure sample and the probe, which is different from the existing technology. It realizes the simulation and calibration of the contact resistance between the probe and the second cell structure sample, and is used to eliminate the interference of contact resistance on welding resistance.

[0068] In one specific embodiment of the present invention, the formula for calculating the contact resistance is:

[0069] ;

[0070] in, The normal current density, For contact resistance, This represents the potential difference between the two sides of the welding surface.

[0071] The above scheme provides a specific formula for calculating contact resistance and explains in detail the logic of calculating contact resistance using a three-dimensional electrostatic model.

[0072] In one specific embodiment of the present invention, the method for obtaining the welding resistance of the welded sample includes:

[0073] Based on the three-dimensional electrostatic model of the welded sample, the contact resistance between the probe and the first battery cell structure sample, and the contact resistance between the probe and the second battery cell structure sample, the welding resistance in the three-dimensional electrostatic model of the welded sample was adjusted using simulation software. The resistance value between the probes at both ends of the welded sample was simulated. ;

[0074] Response to resistance value Test resistance value of welded sample If they are equal, stop adjusting; at this point, the welding resistance... This refers to the welding resistance of the welded sample.

[0075] The above solution provides a method for obtaining the welding resistance of a welding sample that differs from existing technologies. The contact resistance between the probe and the first battery cell structure sample, and the contact resistance between the probe and the second battery cell structure sample, are used as input parameters for the three-dimensional electrostatic model of the welding sample. This eliminates the interference of contact resistance on the welding resistance. Simulation software is used to continuously adjust the value of the welding resistance until the resistance between the probes at both ends of the welding sample is simulated. Test resistance value of welded sample Equal values ​​allow for the acquisition of precise welding resistance values, facilitating the evaluation of the overcurrent capacity of battery cell components under different operating conditions.

[0076] In one specific embodiment of the present invention, the method for obtaining the welding resistance of the welded sample further includes:

[0077] If the welding resistance of welding samples of different sizes is different, the conductivity of the welding sample in the three-dimensional electrostatic model of the welding sample is adjusted by using simulation software to make the welding resistance of welding samples of different sizes consistent. The welding resistance obtained at this time is the true welding resistance. The same welding process is used for welding samples of different sizes.

[0078] In the above scheme, according to theoretical analysis, the welding resistance of different sizes should be consistent. Therefore, if the welding resistance of different sizes is inconsistent, the conductivity of the sample in the model is adjusted to make the welding resistance of different sizes consistent, eliminating the influence of the deviation in the conductivity setting of the sample. The welding resistance obtained at this time is the true welding resistance of the sample.

[0079] In one specific embodiment of the present invention, the first battery cell structure sample and the second battery cell structure sample have the same structural dimensions.

[0080] In the above scheme, the structural dimensions of the first battery cell structure sample and the second battery cell structure sample are designed to be the same, which facilitates modeling.

[0081] Example 2

[0082] Based on the same inventive concept as in Embodiment 1, this embodiment of the invention provides a method for obtaining the welding resistance of a battery cell structure, comprising the following steps:

[0083] The test resistance values ​​of the first and second battery cell structure samples were obtained using an internal resistance meter.

[0084] Based on the test resistance values ​​of the first and second battery cell structure samples, and the three-dimensional electrostatic models of the first and second battery cell structure samples, the contact resistance between the first battery cell structure sample and the probe, and the contact resistance between the second battery cell structure sample and the probe are obtained by simulation.

[0085] The resistance value of the welded sample generated by welding the first cell structure sample and the second cell structure sample was obtained using an internal resistance meter.

[0086] Based on the test resistance value of the welded sample, the contact resistance between the first cell structure sample and the probe, and the contact resistance between the second cell structure sample and the probe, the welding resistance of the welded sample is obtained by simulation using the three-dimensional electrostatic model of the welded sample.

[0087] The rest are the same as in Example 1.

[0088] The method for obtaining the welding resistance of the battery cell structure in this embodiment of the invention will be described in detail below with reference to a specific implementation method.

[0089] I. Experimental Materials and Equipment

[0090] Internal resistance meter: This method calculates the internal resistance of battery cell components by applying an AC signal of a specific frequency (e.g., 1kHz) and measuring the AC voltage drop. The principle is based on the impedance characteristics of the battery cell components under AC signals and the application of Ohm's law. This method is fast, reliable, and non-invasive, making it an effective means of evaluating the resistance of battery cell components.

[0091] Metal sheets: Thin sheets cut into different sizes (see Table 1 for details) are used as the first battery cell structure sample (i.e., sample 1) and the second battery cell structure sample (i.e., sample 2) for testing contact resistance and welding resistance.

[0092] Simulation software (such as COMSOL): used to build simulation models (i.e., three-dimensional electrostatic models) and calculate contact resistance and welding resistance.

[0093] II. Implementation Steps

[0094] Step S1. Use an internal resistance meter to test the resistance of the unsoldered sample.

[0095] 1. Cut the metal sheet into thin slices with a length and width of a*b (the values ​​of a*b are shown in Table 1), which are respectively called the first battery cell structure sample (i.e., unwelded pure sample 1) and the second battery cell structure sample (i.e., unwelded pure sample 2).

[0096] 2. Clamp the two ends of the battery cell structure sample with the probes of an internal resistance meter, such as... Figure 2 and Figure 3As shown, the resistance value between probe 1 and probe 2 was measured. .

[0097] Steps S2 & S3. Using the AC / DC module in COMSOL software, a three-dimensional electrostatic model is established to simulate the contact resistance between the probe and the battery cell structure samples (i.e., unwelded pure sample 1 and unwelded pure sample 2).

[0098] 1. Based on the test platform and the actual dimensions of the welded structural sample, a three-dimensional electrostatic model of the welded structural sample was established using COMSOL software.

[0099] 2. Given the electrical conductivity σ of the welded structure sample, assume the contact resistance between probe 1, probe 2 and sample 1. To ensure the contact resistance between the probe and sample 1 is equal, adjust the contact resistance in the COMSOL software. The resistance value between probe 1 and probe 2 was simulated. ,and Compared with measured values Equal, at this time This is the contact resistance between the probe and sample 1.

[0100] 3. Similarly, the contact resistance between the probe and sample 2 can be calculated. .

[0101] Step S4. Use an internal resistance meter to test the resistance of welded samples with different structural dimensions.

[0102] 1. Weld sample 1 and sample 2 together to obtain the following result: Figure 4 The welded parts shown.

[0103] 2. Clamp both ends of the sample with the probe of the internal resistance meter, such as... Figure 4 and Figure 5 As shown, the resistance value between probe 1 and probe 2 was measured. .

[0104] Step S5. Based on the structural dimensions of different welded samples, establish a three-dimensional electrostatic model of the welded structural component.

[0105] 1. Based on the physical dimensions of the test platform and welded structural components, perform simulation modeling (i.e., establish a three-dimensional electrostatic model of the welded structural components), such as... Figure 6 As shown. Steps S2 and S3 were used to calculate the contact resistance between the probe and samples 1 and 2. and The welding resistance is adjusted in COMSOL software by inputting the three-dimensional electrostatics of the welded structure as an input parameter. The size of the probe was used to simulate the resistance between probe 1 and probe 2. ,and Compared with measured values Equal, at this time This is the required welding resistance.

[0106] Step S6: Multi-size verification and model correction, that is, adjusting the sample conductivity and welding resistance values ​​in the model to make the simulated resistance consistent with the measured resistance. The welding resistance obtained at this time is the real welding resistance.

[0107] 1. In order to obtain accurate welding resistance and eliminate the influence of deviation in the conductivity setting of the sample, the sample was cut into different sizes as follows, and the same process was used for welding. Steps S4 and S5 were repeated, and the welding resistance under different sizes was tested and recorded.

[0108] Table 1. Sample Dimensions List

[0109]

[0110] 2. Analyze the welding resistance values ​​for different sizes. If significant differences exist, adjust the sample conductivity σ in the three-dimensional electrostatic model until the welding resistance values ​​for all sizes tend to be consistent. The welding resistance obtained at this point is the true welding resistance of the sample.

[0111] Example 3

[0112] This invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method for obtaining the welding resistance of the battery cell structure as described in any one of Embodiment 1.

[0113] Example 4

[0114] This invention provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the method for obtaining the welding resistance of the battery cell structure as described in any one of Embodiment 1.

[0115] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0116] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0117] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0118] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0119] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

[0120] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for obtaining the welding resistance of a battery cell structural component, characterized in that, include: Obtain the test resistance values ​​of the first and second battery cell structure samples; Based on the test resistance values ​​of the first and second battery cell structure samples, the contact resistance between the first and second battery cell structure samples and the probe, as well as the contact resistance between the second and third battery cell structure samples and the probe, are obtained by simulation using the three-dimensional electrostatic models of the first and second battery cell structure samples. Obtain the test resistance value of the welded sample generated by welding the first battery cell structure sample and the second battery cell structure sample; Based on the test resistance value of the welded sample, the contact resistance between the first cell structure sample and the probe, and the contact resistance between the second cell structure sample and the probe, the welding resistance of the welded sample is obtained by simulation using the three-dimensional electrostatic model of the welded sample.

2. The method for obtaining the welding resistance of a battery cell structure according to claim 1, characterized in that: The contact resistance between the first battery cell structure sample and the probe was obtained using the following method: Based on the three-dimensional electrostatic model of the first battery cell structure sample, the contact resistance between the probe and the first battery cell structure sample in the three-dimensional electrostatic model was adjusted using simulation software. The resistance value between the probes at both ends of the first battery cell structure sample was simulated. ; Response to resistance value Test resistance value of the first cell structure sample If they are equal, stop adjusting; at this point, the contact resistance... This refers to the contact resistance between the probe and the first battery cell structure sample.

3. The method for obtaining the welding resistance of a battery cell structure according to claim 1, characterized in that: The contact resistance between the second cell structure sample and the probe was obtained using the following method: Based on the three-dimensional electrostatic model of the second battery cell structure sample, the contact resistance between the probe and the second battery cell structure sample in the three-dimensional electrostatic model was adjusted using simulation software. The resistance value between the probes at both ends of the second cell structure sample was simulated. ; Response to resistance value Test resistance value of the second cell structure sample If they are equal, stop adjusting; at this point, the contact resistance... This refers to the contact resistance between the probe and the second battery cell structure sample.

4. A method for obtaining the welding resistance of a battery cell structure according to claim 2 or 3, characterized in that: The formula for calculating the contact resistance is: ； in, The normal current density, For contact resistance, This represents the potential difference between the two sides of the welding surface.

5. The method for obtaining the welding resistance of a battery cell structure according to claim 1, characterized in that: The method for obtaining the welding resistance of the welded sample includes: Based on the three-dimensional electrostatic model of the welded sample, the contact resistance between the probe and the first battery cell structure sample, and the contact resistance between the probe and the second battery cell structure sample, the welding resistance in the three-dimensional electrostatic model of the welded sample was adjusted using simulation software. The resistance value between the probes at both ends of the welded sample was simulated. ; Response to resistance value Test resistance value of welded sample If they are equal, stop adjusting; at this point, the welding resistance... This refers to the welding resistance of the welded sample.

6. The method for obtaining the welding resistance of a battery cell structure according to claim 5, characterized in that: The method for obtaining the welding resistance of the welded sample further includes: If the welding resistance of welding samples of different sizes is different, the conductivity of the welding sample in the three-dimensional electrostatic model of the welding sample is adjusted by using simulation software to make the welding resistance of welding samples of different sizes consistent. The welding resistance obtained at this time is the true welding resistance. The same welding process is used for welding samples of different sizes.

7. The method for obtaining the welding resistance of a battery cell structure according to claim 6, characterized in that: The first and second battery cell structure samples have the same structural dimensions.

8. A method for obtaining the welding resistance of a battery cell structural component, characterized in that, include: The test resistance values ​​of the first and second battery cell structure samples were obtained using an internal resistance meter. Based on the test resistance values ​​of the first and second battery cell structure samples, and the three-dimensional electrostatic models of the first and second battery cell structure samples, the contact resistance between the first battery cell structure sample and the probe, and the contact resistance between the second battery cell structure sample and the probe are obtained by simulation. The resistance value of the welded sample generated by welding the first cell structure sample and the second cell structure sample was obtained using an internal resistance meter. Based on the test resistance value of the welded sample, the contact resistance between the first cell structure sample and the probe, and the contact resistance between the second cell structure sample and the probe, the welding resistance of the welded sample is obtained by simulation using the three-dimensional electrostatic model of the welded sample.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by the processor, the program implements the method for obtaining the welding resistance of the battery cell structure as described in any one of claims 1 to 7.

10. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instruction is executed by the processor, it implements the method for obtaining the welding resistance of the battery cell structure as described in any one of claims 1 to 7.

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