阅读说明：本技术 一种圆柱形锂电池结构设计模拟仿真分析方法 (Simulation analysis method for structural design of cylindrical lithium battery ) 是由 刘杰 蒋亚东 褚学军 于 2021-07-16 设计创作，主要内容包括：本发明公开了一种圆柱形锂电池结构设计模拟仿真分析方法,通过以每个部件的坐标位置为基础,绘制出具有实体形状的图形,用图像表现出圆柱电池的电芯结构,反映出具体工艺尺寸下电池的内部结构。本发明采用上述的一种圆柱形锂电池结构设计模拟仿真分析方法,对于圆柱形电池的工艺设计的有积极作用,精确度高。(The invention discloses a simulation analysis method for structural design of a cylindrical lithium battery, which is characterized in that a graph with a solid shape is drawn based on the coordinate position of each component, and the core structure of the cylindrical battery is represented by the graph to reflect the internal structure of the battery under a specific process size. The invention adopts the simulation analysis method for the structural design of the cylindrical lithium battery, has positive effect on the process design of the cylindrical battery and has high accuracy.)

1. A simulation analysis method for structural design of a cylindrical lithium battery is characterized by comprising the following steps: drawing a graph with a solid shape on the basis of the coordinate position of each component, and showing the cell structure of the cylindrical battery by using the graph to reflect the internal structure of the battery under a specific process size;

the method comprises the following specific steps:

s1, designing the appearance size of the battery and the state parameters of each part according to the regulations and requirements;

s2, calculating the position data of each part after the winding pole group is formed according to the size parameters and the position requirements of each part;

and S3, drawing the position data of each part into a graph, and combining to form a simulation graph.

2. The simulation analysis method for structural design of a cylindrical lithium battery according to claim 1, wherein the simulation analysis method comprises the following steps: in step S1, the coating amount of the electroactive material, the size parameters of the electrode sheet and the separator in the flattened state, and the corresponding sizes and relative position parameters of the tab and the adhesive are designed according to the specified capacity of the battery and the size requirement of the case.

3. The simulation analysis method for structural design of a cylindrical lithium battery according to claim 1, wherein the simulation analysis method comprises the following steps: in the step S2, the calculation method is based on the designed characteristic parameters, the winding start point of the diaphragm is the winding start position, the center of the winding needle is the origin, and the coordinate position of the corresponding point after each 1 ° winding of the single component is calculated by using the rotation radius and the rotation angle of the winding needle;

taking the accumulated arc length after each winding of 1 degree as the total winding length of the part, then inserting other parts into the part at a proper position after the designed winding length (a transition arc of 5-20 degrees needs to be formed according to the thickness of the part before the part is inserted or after the winding is finished), and calculating the coordinate position of a point after each winding of 1 degree of each layer according to the radius and the rotating angle of the part by combining the thickness of the part until the winding is finished.

4. The simulation analysis method for structural design of a cylindrical lithium battery according to claim 1, wherein the simulation analysis method comprises the following steps: in step S3, the relevant points of the individual parts are finally connected in a smooth curve to form a planar spiral diagram of the part, i.e., a positional state diagram thereof; integrating and processing all the components to form a cylindrical battery structure simulation diagram (cross section) with certain solid appearance; and then extracting the coordinate position of the circumferential point of the formed pole group and the diameter distribution data of the pole group according to the integral data to form a curve chart and a circumference chart.

5. The simulation analysis method for structural design of a cylindrical lithium battery according to claim 1, wherein the simulation analysis method comprises the following steps: the simulation analysis method is suitable for any lithium ion battery with cylindrical winding process structure design.

6. The simulation analysis method for structural design of a cylindrical lithium battery according to claim 1, wherein the simulation analysis method comprises the following steps: the simulation analysis method can accurately simulate the outer diameter size, the positive and negative pole piece inserting positions, the lug positions, the rubberizing positions and the circularity of the winding-formed pole group.

Technical Field

The invention relates to the technical field of lithium ion battery design, in particular to a simulation analysis method for cylindrical lithium battery structure design.

Background

The lithium ion battery is a novel green energy storage battery, has the advantages of high energy density, long service life, low self-discharge rate, no memory effect and the like, and is widely applied to the fields of electronic technology, electric automobiles, solar energy storage, emergency standby power supplies, aerospace and the like.

Among lithium batteries, cylindrical lithium batteries are very popular, so the requirements for the performance thereof are also increasing, wherein the improvement of the design process of the lithium batteries and the design of the batteries of new materials are key steps.

Currently, each new material or new process needs to be optimized and designed according to the process capability of each link. In the design of the battery structure, the method for calculating the cell diameter is complex and rough under the condition of limited data, and the prediction of the overall structure state after the cell is formed and the positions of all parts is extremely difficult, so that the deviation from the design expectation in the production actual condition of the battery is large.

Meanwhile, the influence of unreasonable design on the safety of the battery is fatal, the accuracy and the reasonability of battery design are difficult to judge in time, and the risk of the battery in the production and use processes cannot be effectively avoided. Moreover, when the lithium cell pursues high energy density, improve the utilization ratio to the inside limited space of battery and become very important, the relative position of each part inside the battery directly influences the circularity of coiling shaping electric core, and each part position arrangement is unreasonable, and the circularity will be relatively poor, and space utilization just also can reduce, so rational utilization battery inner space is very important to improving battery energy density.

Disclosure of Invention

The invention aims to provide a simulation analysis method for structural design of a cylindrical lithium battery, which has a positive effect on the process design of the cylindrical battery and has high accuracy.

In order to achieve the aim, the invention provides a simulation analysis method for structural design of a cylindrical lithium battery, which is characterized in that a graph with a solid shape is drawn on the basis of the coordinate position of each component, and the graph shows the cell structure of the cylindrical battery to reflect the internal structure of the battery under a specific process size;

the method comprises the following specific steps:

s1, designing the appearance size of the battery and the state parameters of each part according to the regulations and requirements;

s2, calculating the position data of each part after the winding pole group is formed according to the size parameters and the position requirements of each part;

and S3, drawing the position data of each part into a graph, and combining to form a simulation graph.

Preferably, in step S1, the coating amount of the electroactive material, the size parameters of the electrode sheet and the separator in the flattened state, and the corresponding size and relative position parameters of the tab and the adhesive are designed according to the specified capacity of the battery and the size requirement of the housing.

Preferably, in step S2, the calculation method is based on the designed characteristic parameters, the winding start point of the diaphragm is the winding start position, the center of the winding needle is the origin, and the coordinate position of the corresponding point after each 1 ° winding of the single component is calculated by using the rotation radius and the rotation angle of the winding needle;

taking the accumulated arc length after each winding of 1 degree as the total winding length of the part, then inserting other parts into the part at a proper position after the designed winding length (a transition arc of 5-20 degrees needs to be formed according to the thickness of the part before the part is inserted or after the winding is finished), and calculating the coordinate position of a point after each winding of 1 degree of each layer according to the radius and the rotating angle of the part by combining the thickness of the part until the winding is finished.

Preferably, in step S3, the relevant points of the individual component are finally connected in a smooth curve to form a planar spiral diagram of the component, i.e., a positional state diagram thereof; integrating and processing all the components to form a cylindrical battery structure simulation diagram (cross section) with certain solid appearance; and then extracting the coordinate position of the circumferential point of the formed pole group and the diameter distribution data of the pole group according to the integral data to form a curve chart and a circumference chart.

Preferably, the simulation analysis method is suitable for any lithium ion battery with cylindrical winding process structure design.

Preferably, the simulation analysis method can accurately simulate the outer diameter size, the positive and negative pole plate inserting positions, the lug positions, the rubberizing positions and the circularity of the winding-formed pole group.

Therefore, the invention adopts the simulation analysis method for the structural design of the cylindrical lithium battery, and has the following technical advantages:

(1) the simulation analysis method of the invention has wide application, and objects can be all parts of a formed battery core under the lithium battery winding process, including a diaphragm, a rubberizing, a positive electrode tab, a negative electrode tab, a current collector, active substances under effective coating positions and the like.

(2) The simulation analysis method provided by the invention simulates the positions and states of all components in the battery cell after winding, and visually reflects the specific structure in the battery cell.

(3) The simulation analysis method provided by the invention simulates appearance embodiment of the battery structure under specific data, and has high accuracy.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a flow chart of a simulation analysis method for structural design of a cylindrical lithium battery according to the present invention;

FIG. 2 is a simulation of the winding process of the present invention;

FIG. 3 is a schematic view of the diaphragm position after winding of the present invention is completed;

FIG. 4 is a schematic view of the internal structure of the shaped pole set of the present invention;

fig. 5 is a circumferential view of the actual size of the core and the size of the steel shell after the winding forming of the invention;

FIG. 6 is a plot of the coil-formed pole group diameter distribution of the present invention.

Detailed Description

The technical solution of the present invention is further illustrated by the accompanying drawings and examples.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

As shown in the figure, the simulation analysis method for the structural design of the cylindrical lithium battery comprises the steps of drawing a graph with a solid shape on the basis of the coordinate position of each component, and representing the cell structure of the cylindrical battery by using the graph to reflect the internal structure of the battery under a specific process size;

the method comprises the following specific steps:

designing the appearance size and the state parameters of each part of the battery according to the specification and the requirement, wherein the parameters are shown in a table 1;

TABLE 1 Battery actual design parameter Table

The parameters comprise Inner-Sep (pre-rolling diaphragm), separator, Cathode-Foil, Cathode-Tab (Cathode Tab), C-Ins-Tape (Cathode insulating Tape), Cathode-Side (Cathode coating), Antode-Foil, Antode-Tab (Cathode Tab), Antode-Tab-Tape (Cathode Tab rubberizing), Antode-Side (Cathode coating), and jellyroll-Tape (terminating Tape). Wherein the thickness, length, and winding start position of each item are required.

Further, with the winding starting point of the diaphragm as the winding starting position, the center of the winding needle as the origin and the diameter of the winding needle as the center hole, the coordinate position of the corresponding point after each winding of 1 ° of the single component is calculated by using the rotation radius and the rotation angle thereof, as shown in fig. 2, and the accumulated arc length after each winding of 1 ° is taken as the total winding length of the component.

Further, other parts are inserted into the sheet at a proper position after the designed length is wound, and according to the thickness of the part and the radius and the rotating angle of the part, the coordinate position of the point of each layer after each layer is wound by 1 degree is calculated until the winding is finished.

TABLE 2 partial winding calculation coordinate position data sheet

Further, the relevant points of the individual components are connected in a smooth curve to form a planar spiral diagram of the component, i.e., a positional state diagram thereof, as shown in fig. 3. And then all the components are integrated and processed to form a cylindrical battery structure simulation diagram (cross section) with certain solid appearance, as shown in figure 4.

Further, the coordinate position of the circumferential point of the formed pole group and the diameter distribution data of the pole group are extracted according to the overall data to be made into a curve chart and a circumference chart, such as fig. 5 and 6.

The simulation graph is used as a reference, and the roundness of the positive and negative electrode tabs is ensured by combining with the actual situation and the control of links or the process requirement to ensure that the positive and negative electrode tabs present proper angles so as to ensure the maximization of the utilization of the internal space.

Therefore, the simulation analysis method for the structural design of the cylindrical lithium battery has a positive effect on the process design of the cylindrical battery and is high in accuracy.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.